Imported from libpng-1.0.12beta1.tar

ANNOUNCE

@@ -1,46 +1,20 @@
 
-Libpng 1.0.5d - November 29, 1999
+Libpng 1.0.12beta1 - May 14, 2001
 
-This is not intended to be a public release.  It will be replaced
-within a few weeks by a public version or by another test version.
+This is a public release of libpng, intended for use in production codes.
 
-Changes since the last public release (1.0.5):
+Changes since the last public release (1.0.11):
 
-version libpng-1.0.5a October 23, 1999
-  Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
-  Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
-  Further optimization and bugfix of pngvcrd.c
-  Revised pngset.c so that it does not allocate or free memory in the user's
-    text_ptr structure.  Instead, it makes its own copy.
-  Created separate write_end_info_struct in pngtest.c for a more severe test.
-  Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
-version libpng-1.0.5b November 23, 1999
-  Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
-    PNG_FLAG_WROTE_tIME from flags to mode.
-  Added png_write_info_before_PLTE() function.
-  Fixed some typecasting in contrib/gregbook/*.c
-  Updated scripts/makevms.com and added makevms.com to contrib/gregbook
-    and contrib/pngminus (Martin Zinser)
-version libpng-1.0.5c November 26, 1999
-  Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
-  Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
-    accomodate making DLL's: Moved usr_png_ver from global variable to function
-    png_get_header_ver() in png.c.  Moved png_sig to png_sig_bytes in png.c and
-    eliminated use of png_sig in pngwutil.c.  Moved the various png_CHNK arrays
-    into pngtypes.h.  Eliminated use of global png_pass arrays.  Declared the
-    png_CHNK and png_pass arrays to be "const".  Made the global arrays
-    available to applications (although none are used in libpng itself) when
-    PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
-  Removed some extraneous "-I" from contrib/pngminus/makefile.std
-  Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
-  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3 
-version 1.0.5d [November 29, 1999]
-  Add type cast (png_const_charp) two places in png.c
-  Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
-  Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
-    to applications a macro "PNG_USE_LOCAL_ARRAYS".
-  #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
-  Added PNG_EXPORT_VAR macro to accommodate making DLL's.
+  Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
+  Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
+  Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
+  Bumped DLLNUM to 2.
+  Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
+  Eliminated the png_error about apps using png_read|write_init().  Instead,
+    libpng will reallocate the png_struct and info_struct if they are too small.
+    This achieves future binary compatibility for old applications written for
+    libpng-0.88 and earlier.
+  Modified png_create_struct so it passes user mem_ptr to user memory allocator.
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

CHANGES

@@ -123,6 +123,7 @@ version 0.90 [January, 1997]
      - all chunk handling routines have the same prototypes, so we will
        be able to handle all chunks via a callback mechanism
   try to fix Linux "setjmp" buffer size problems
+  removed png_large_malloc, png_large_free, and png_realloc functions.
 version 0.95 [March, 1997]
   fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
   fixed bug in PNG file signature compares when start != 0
@@ -259,6 +260,7 @@ version 0.99h [March 6, 1998, evening]
   Minor changes to previous minor changes to pngtest.c
   Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
   and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+  Added user transform capability
 version 1.00 [March 7, 1998]
   Changed several typedefs in pngrutil.c
   Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
@@ -377,7 +379,7 @@ version 1.0.2a [December 30, 1998]
   Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
   Removed lines after Dynamic Dependencies" in makefile.aco .
   Revised makefile.dec to make a shared library (Jeremie Petit).
-  Removed trailing blanks from all files. 
+  Removed trailing blanks from all files.
 version 1.0.2a [January 6, 1999]
   Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
   Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
@@ -390,7 +392,7 @@ version 1.0.3 [January 14, 1999]
 version 1.0.3a [August 12, 1999]
   Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
      if an attempt is made to read an interlaced image when it's not supported.
-  Added check if png_ptr->trans is defined before free'ing it in pngread.c
+  Added check if png_ptr->trans is defined before freeing it in pngread.c
   Modified the Y2K statement to include versions back to version 0.71
   Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
   Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
@@ -503,7 +505,7 @@ version 1.0.5c [November 26, 1999]
     PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
   Removed some extraneous "-I" from contrib/pngminus/makefile.std
   Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
-  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3 
+  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
 version 1.0.5d [November 29, 1999]
   Add type cast (png_const_charp) two places in png.c
   Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
@@ -511,3 +513,436 @@ version 1.0.5d [November 29, 1999]
     to applications a macro "PNG_USE_LOCAL_ARRAYS".
   #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
   Added PNG_EXPORT_VAR macro to accommodate making DLL's.
+version 1.0.5e [November 30, 1999]
+  Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
+    structure; refactored the inflate/deflate support to make adding new chunks
+    with trailing compressed parts easier in the future, and added new functions
+    png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
+    png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
+  NOTE: Applications that write text chunks MUST define png_text->lang
+    before calling png_set_text(). It must be set to NULL if you want to
+    write tEXt or zTXt chunks.  If you want your application to be able to
+    run with older versions of libpng, use
+
+      #ifdef PNG_iTXt_SUPPORTED
+         png_text[i].lang = NULL;
+      #endif
+
+  Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
+    offsets (Eric S. Raymond).
+  Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
+    PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
+    macros, leaving the separate macros also available.
+  Removed comments on #endifs at the end of many short, non-nested #if-blocks.
+version 1.0.5f [December 6, 1999]
+  Changed makefile.solaris to issue a warning about potential problems when
+    the ucb "ld" is in the path ahead of the ccs "ld".
+  Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
+  Added sCAL chunk support (Eric S. Raymond).
+version 1.0.5g [December 7, 1999]
+  Fixed "png_free_spallettes" typo in png.h
+  Added code to handle new chunks in pngpread.c
+  Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
+  Added "translated_key" to png_text structure and png_write_iTXt().
+  Added code in pngwrite.c to work around a newly discovered zlib bug.
+version 1.0.5h [December 10, 1999]
+  NOTE: regarding the note for version 1.0.5e, the following must also
+    be included in your code:
+        png_text[i].translated_key = NULL;
+  Unknown chunk handling is now supported.
+  Option to eliminate all floating point support was added.  Some new
+    fixed-point functions such as png_set_gAMA_fixed() were added.
+  Expanded tabs and removed trailing blanks in source files.
+version 1.0.5i [December 13, 1999]
+  Added some type casts to silence compiler warnings.
+  Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
+  Removed leading blanks from a #define in pngvcrd.c
+  Added some parameters to the new png_set_keep_unknown_chunks() function.
+  Added a test for up->location != 0 in the first instance of writing
+    unknown chunks in pngwrite.c
+  Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
+    prevent recursion.
+  Added png_free_hIST() function.
+  Various patches to fix bugs in the sCAL and integer cHRM processing,
+    and to add some convenience macros for use with sCAL.
+version 1.0.5j [December 21, 1999]
+  Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
+    around buggy compilers.
+  Added new type "png_fixed_point" for integers that hold float*100000 values
+  Restored backward compatibility of tEXt/zTXt chunk processing:
+    Restored the first four members of png_text to the same order as v.1.0.5d.
+    Added members "lang_key" and "itxt_length" to png_text struct.  Set
+    text_length=0 when "text" contains iTXt data.  Use the "compression"
+    member to distinguish among tEXt/zTXt/iTXt types.  Added
+    PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
+    The "Note" above, about backward incompatibility of libpng-1.0.5e, no
+    longer applies.
+  Fixed png_read|write_iTXt() to read|write parameters in the right order,
+    and to write the iTXt chunk after IDAT if it appears in the end_ptr.
+  Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
+  Reversed the order of trying to write floating-point and fixed-point gAMA.
+version 1.0.5k [December 27, 1999]
+  Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
+  Added png_handle_as_unknown() function (Glenn)
+  Added png_free_chunk_list() function and chunk_list and num_chunk_list members
+    of png_ptr.
+  Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
+  Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
+    about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
+  Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
+  Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
+  Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
+version 1.0.5l [January 1, 2000]
+  Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
+    for setting a callback function to handle unknown chunks and for
+    retrieving the associated user pointer (Glenn).
+version 1.0.5m [January 7, 2000]
+  Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
+version 1.0.5n [January 9, 2000]
+  Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
+    own memory for info_ptr->palette.  This makes it safe for the calling
+    application to free its copy of the palette any time after it calls
+    png_set_PLTE().
+version 1.0.5o [January 20, 2000]
+  Cosmetic changes only (removed some trailing blanks and TABs)
+version 1.0.5p [January 31, 2000]
+  Renamed pngdll.mak to makefile.bd32
+  Cosmetic changes in pngtest.c
+version 1.0.5q [February 5, 2000]
+  Relocated the makefile.solaris warning about PATH problems.
+  Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
+  Revised makefile.gcmmx
+  Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
+version 1.0.5r [February 7, 2000]
+  Removed superfluous prototype for png_get_itxt from png.h
+  Fixed a bug in pngrtran.c that improperly expanded the background color.
+  Return *num_text=0 from png_get_text() when appropriate, and fix documentation
+    of png_get_text() in libpng.txt/libpng.3.
+version 1.0.5s [February 18, 2000]
+  Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
+    new error handler that's planned for the next libpng release, and changed
+    example.c, pngtest.c, and contrib programs to use this macro.
+  Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
+  Fixed a bug in png_read_png() that caused it to fail to expand some images
+    that it should have expanded.
+  Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
+    in pngget.c
+  Changed the allocation of palette, history, and trans arrays back to
+    the version 1.0.5 method (linking instead of copying) which restores
+    backward compatibility with version 1.0.5.  Added some remarks about
+    that in example.c.  Added "free_me" member to info_ptr and png_ptr
+    and added png_free_data() function.
+  Updated makefile.linux and makefile.gccmmx to make directories conditionally.
+  Made cosmetic changes to pngasmrd.h
+  Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
+  Modified png_read_png() to allocate info_ptr->row_pointers only if it
+    hasn't already been allocated.
+version 1.0.5t [March 4, 2000]
+  Changed png_jmp_env() migration aiding macro to png_jmpbuf().
+  Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
+  Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
+    PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
+  Files in contrib/gregbook were revised to use png_jmpbuf() and to select
+    a 24-bit visual if one is available, and to allow abbreviated options.
+  Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
+  Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
+version 1.0.5u [March 5, 2000]
+  Simplified the code that detects old png.h in png.c and pngtest.c
+  Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
+  Increased precision of rgb_to_gray calculations from 8 to 15 bits and
+    added png_set_rgb_to_gray_fixed() function.
+  Added makefile.bc32 (32-bit Borland C++, C mode)
+version 1.0.5v [March 11, 2000]
+  Added some parentheses to the png_jmpbuf macro definition.
+  Updated references to the zlib home page, which has moved to freesoftware.com.
+  Corrected bugs in documentation regarding png_read_row() and png_write_row().
+  Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
+  Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
+    revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
+version 1.0.6 [March 20, 2000]
+  Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
+  Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6d [April 7, 2000]
+  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
+  Added data_length parameter to png_decompress_chunk() function
+  Revised documentation to remove reference to abandoned png_free_chnk functions
+  Fixed an error in png_rgb_to_gray_fixed()
+  Revised example.c, usage of png_destroy_write_struct().
+  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
+  Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
+  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
+version 1.0.6e [April 9, 2000]
+  Added png_data_freer() function.
+  In the code that checks for over-length tRNS chunks, added check of
+    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
+  Minor revisions of libpng.txt/libpng.3.
+  Check for existing data and free it if the free_me flag is set, in png_set_*()
+    and png_handle_*().
+  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
+    is defined.
+  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
+    and mentioned the purposes of the two macros in libpng.txt/libpng.3.
+version 1.0.6f [April 14, 2000]
+  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
+  Add checks in png_set_text() for NULL members of the input text structure.
+  Revised libpng.txt/libpng.3.
+  Removed superfluous prototype for png_set_itxt from png.h
+  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
+  Changed several png_errors about malformed ancillary chunks to png_warnings.
+version 1.0.6g [April 24, 2000]
+  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
+  Relocated paragraph about png_set_background() in libpng.3/libpng.txt
+    and other revisions (Matthias Benckmann)
+  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
+    png_ptr members to restore binary compatibility with libpng-1.0.5
+    (breaks compatibility with libpng-1.0.6).
+version 1.0.6h [April 24, 2000]
+  Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
+    libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
+    This is a temporary change for test purposes.
+version 1.0.6i [May 2, 2000]
+  Rearranged some members at the end of png_info and png_struct, to put
+    unknown_chunks_num and free_me within the original size of the png_structs
+    and free_me, png_read_user_fn, and png_free_fn within the original png_info,
+    because some old applications allocate the structs directly instead of
+    using png_create_*().
+  Added documentation of user memory functions in libpng.txt/libpng.3
+  Modified png_read_png so that it will use user_allocated row_pointers
+    if present, unless free_me directs that it be freed, and added description
+    of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
+  Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
+    1.00) members of png_struct and png_info, to regain binary compatibility
+    when you define this macro.  Capabilities lost in this event
+    are user transforms (new in version 1.0.0),the user transform pointer
+    (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
+    the high-level interface, and unknown chunks support (all new in 1.0.6).
+    This was necessary because of old applications that allocate the structs
+    directly as authors were instructed to do in libpng-0.88 and earlier,
+    instead of using png_create_*().
+  Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
+    can be used to detect codes that directly allocate the structs, and
+    code to check these modes in png_read_init() and png_write_init() and
+    generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
+    was not defined.
+  Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
+version 1.0.6j [May 3, 2000]
+  Overloaded png_read_init() and png_write_init() with macros that convert
+    calls to png_read_init_2() or png_write_init_2() that check the version
+    and structure sizes.
+version 1.0.7beta11 [May 7, 2000]
+  Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
+    which are no longer used.
+  Eliminated the three new members of png_text when PNG_NO_iTXt_SUPPORTED
+    or PNG_LEGACY_SUPPORTED is defined.
+  Made PNG_NO_ITXT_SUPPORTED the default setting, to avoid memory overrun
+    when old applications fill the info_ptr->text structure directly.
+  Added PNGAPI macro, and added it to the definitions of all exported functions.
+  Relocated version macro definitions ahead of the includes of zlib.h and
+    pngconf.h in png.h.
+version 1.0.7beta12 [May 12, 2000]
+  Revised pngset.c to avoid a problem with expanding the png_debug macro.
+  Deleted some extraneous defines from pngconf.h
+  Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
+  Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
+  Added png_access_version_number() function.
+  Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
+  Expanded libpng.3/libpng.txt information about png_data_freer().
+version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
+  Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
+    warnings instead of errors, as pngrutil.c does.
+  Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
+    will actually write IDATs.
+  Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
+  Make png_free_data() ignore its final parameter except when freeing data
+    that can have multiple instances (text, sPLT, unknowns).
+  Fixed a new bug in png_set_rows().
+  Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
+  Added png_set_invalid() function.
+  Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
+version 1.0.7beta15 [May 30, 2000]
+  Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
+    fewer error messages.
+  Rearranged checks for Z_OK to check the most likely path first in pngpread.c
+    and pngwutil.c.
+  Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
+    in libpng.txt/libpng.3 the need for applications to check this.
+  Changed names of png_default_*() functions in pngtest to pngtest_*().
+  Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
+  Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
+  Set each pointer to NULL after freeing it in png_free_data().
+  Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
+    macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
+  Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
+version 1.0.7beta16 [June 4, 2000]
+  Revised the workaround of AIX string.h "index" bug.
+  Added a check for overlength PLTE chunk in pngrutil.c.
+  Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
+    indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
+  Added a warning in png_decompress_chunk() when it runs out of data, e.g.
+    when it tries to read an erroneous PhotoShop iCCP chunk.
+  Added PNG_USE_DLL macro.
+  Revised the copyright/disclaimer/license notice.
+  Added contrib/msvctest directory
+version 1.0.7rc1 [June 9, 2000]
+  Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)
+  Added contrib/visupng directory (Willem van Schaik)
+version 1.0.7beta18 [June 23, 2000]
+  Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
+    and do not redefine PNGAPI if it is passed in via a compiler directive.
+  Revised visupng/PngFile.c to remove returns from within the Try block.
+  Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
+  Updated contrib/visupng/cexcept.h to version 1.0.0.
+  Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
+version 1.0.7rc2 [June 28, 2000]
+  Updated license to include disclaimers required by UCITA.
+  Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
+version 1.0.7 [July 1, 2000]
+  Revised the definition of "trans_values" in libpng.3/libpng.txt
+version 1.0.8beta1 [July 8, 2000]
+  Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
+  Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
+     pngwutil.c.
+  Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
+  Removed unused "#include <assert.h>" from png.c
+  Added WindowsCE support.
+  Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
+version 1.0.8beta2 [July 10, 2000]
+  Added project files to the wince directory and made further revisions
+     of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
+version 1.0.8beta3 [July 11, 2000]
+  Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
+     for indexed-color input files to avoid potential double-freeing trans array
+     under some unusual conditions; problem was introduced in version 1.0.6f.
+  Further revisions to pngtest.c and files in the wince subdirectory.
+version 1.0.8beta4 [July 14, 2000]
+  Added the files pngbar.png and pngbar.jpg to the distribution.
+  Added makefile.cygwin, and cygwin support in pngconf.h
+  Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
+version 1.0.8rc1 [July 16, 2000]
+  Revised png_debug() macros and statements to eliminate compiler warnings.
+version 1.0.8 [July 24, 2000]
+  Added png_flush() in pngwrite.c, after png_write_IEND().
+  Updated makefile.hpux to build a shared library.
+version 1.0.9beta1 [November 10, 2000]
+  Fixed typo in scripts/makefile.hpux
+  Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
+  Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
+  Changed "cdrom.com" in documentation to "libpng.org"
+  Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
+  Changed type of "params" from voidp to png_voidp in png_read|write_png().
+  Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
+  Revised the 3 instances of WRITEFILE in pngtest.c.
+  Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
+  Updated png.rc in dll/msvc project
+  Revised makefile.dec to define and use LIBPATH and INCPATH
+  Increased size of global png_libpng_ver[] array from 12 to 18 chars.
+  Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
+  Removed duplicate png_crc_finish() from png_handle_bKGD() function.
+  Added a warning when application calls png_read_update_info() multiple times.
+  Revised makefile.cygwin
+  Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
+  Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
+version 1.0.9beta2 [November 19, 2000]
+  Renamed the "dll" subdirectory "projects".
+  Added borland project files to "projects" subdirectory.
+  Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
+  Add error message in png_set_compression_buffer_size() when malloc fails.
+version 1.0.9beta3 [November 23, 2000]
+  Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+  Removed the png_flush() in pngwrite.c that crashes some applications
+    that don't set png_output_flush_fn.
+  Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+version 1.0.9beta5 [December 15, 2000]
+  Added support for filter method 64 (for PNG datastreams embedded in MNG).
+version 1.0.9beta6 [December 18, 2000]
+  Revised png_set_filter() to accept filter method 64 when appropriate.
+  Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+    help prevent applications from using MNG features in PNG datastreams.
+  Added png_permit_mng_features() function.
+  Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
+version 1.0.9rc1 [December 23, 2000]
+  Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
+  Fixed error handling of unknown compression type in png_decompress_chunk().
+  In pngconf.h, define __cdecl when _MSC_VER is defined.
+version 1.0.9beta7 [December 28, 2000]
+  Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+  Revised memory management in png_set_hIST and png_handle_hIST in a backward
+    compatible manner.  PLTE and tRNS were revised similarly.
+  Revised the iCCP chunk reader to ignore trailing garbage.
+version 1.0.9beta8 [January 12, 2001]
+  Moved pngasmrd.h into pngconf.h.
+  Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
+version 1.0.9beta9 [January 15, 2001]
+  Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
+    wince and msvc project module definition files.
+  Minor revision of makefile.cygwin.
+  Fixed bug with progressive reading of narrow interlaced images in pngpread.c
+version 1.0.9beta10 [January 16, 2001]
+  Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
+  Fixed "png_mmx_supported" typo in project definition files.
+version 1.0.9beta11 [January 19, 2001]
+  Updated makefile.sgi to make shared library.
+  Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
+    by default, for the benefit of DLL forward compatibility.  These will
+    be re-enabled in version 1.2.0.
+version 1.0.9rc2 [January 22, 2001]
+  Revised cygwin support.
+version 1.0.9 [January 31, 2001]
+  Added check of cygwin's ALL_STATIC in pngconf.h
+  Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
+version 1.0.10beta1 [March 14, 2001]
+  Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
+  Reformatted libpng.3 to eliminate bad line breaks.
+  Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
+  Added prototype for png_mmx_support() near the top of pnggccrd.c
+  Moved some error checking from png_handle_IHDR to png_set_IHDR.
+  Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
+  Revised png_mmx_support() function in pnggccrd.c
+  Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
+  Fixed memory leak in contrib/visupng/PngFile.c
+  Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
+  Added warnings when retrieving or setting gamma=0.
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
+version 1.0.10rc1 [March 23, 2001]
+  Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
+    and png_strlen.
+  Revised png_mmx_supported() function in pnggccrd.c to return proper value.
+  Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
+version 1.0.10 [March 30, 2001]
+  Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
+  Added beos project files (Chris Herborth)
+version 1.0.11beta1 [April 3, 2001]
+  Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
+  Removed a no-longer needed AIX work-around from pngconf.h
+  Changed several "//" single-line comments to C-style in pnggccrd.c
+version 1.0.11beta2 [April 11, 2001]
+  Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
+  Updated scripts/pngos2.def
+version 1.0.11beta3 [April 14, 2001]
+  Added checking the results of many instances of png_malloc() for NULL
+version 1.0.11beta4 [April 20, 2001]
+  Undid the changes from version 1.0.11beta3.  Added a check for NULL return
+    from user's malloc_fn().
+  Removed some useless type casts of the NULL pointer.
+  Added makefile.netbsd
+version 1.0.11 [April 27, 2001]
+  Revised makefile.netbsd
+version 1.0.12beta1 [May 14, 2001]
+  Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
+  Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
+  Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
+  Bumped DLLNUM to 2.
+  Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
+  Eliminated the png_error about apps using png_read|write_init().  Instead,
+    libpng will reallocate the png_struct and info_struct if they are too small.
+    This achieves future binary compatibility for old applications written for
+    libpng-0.88 and earlier.
+  Modified png_create_struct so it passes user mem_ptr to user memory allocator.
+
+Send comments/corrections/commendations to
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
+
+Glenn R-P

INSTALL

@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.5d - November 29, 1999
+Installing libpng version 1.0.12beta1 - May 14, 2001
 
 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,7 +10,7 @@ zlib.h and zconf.h include files that correspond to the
 version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.0.5d" or "lpng103" and "zlib-1.1.3"
+might be called "libpng-1.0.12beta1" or "lpng109" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -23,8 +23,15 @@ Your directory structure should look like this:
           *.c
           contrib
              gregbook
+             msvctest
              pngminus
              pngsuite
+             visupng
+          projects
+             beos
+             borland
+             msvc
+             wince
           scripts
              makefile.*
           pngtest.png
@@ -36,23 +43,44 @@ Your directory structure should look like this:
           contrib
           etc.
 
-First enter the zlib directory and follow the instructions
-in zlib/README.  Then come back here and choose the
-appropriate makefile.sys in the scripts directory.
+If the line endings in the files look funny, you may wish to get the other
+distribution of libpng.  It is available in both tar.gz (UNIX style line
+endings) and zip (DOS style line endings) formats.
+
+If you are building libpng with MSVC, you can enter the libpng\msvc directory
+and follow the instructions in msvc\README.txt.  You can build libpng for
+WindowsCE by entering the libpng\wince directory and following the
+instructions in the README* files.
+
+Else enter the zlib directory and follow the instructions in zlib/README,
+then come back here and choose the appropriate makefile.sys in the scripts
+directory.
+
 The files that are presently available in the scripts directory
 include
 
- descrip.mms       =>  VMS makefile for MMS or MMK
- makefile.std      =>  Generic UNIX makefile
+ makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.12beta1)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.12beta1,
+                       uses assembler code tuned for Intel MMX platform)
+ makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
                        ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix      =>  AIX makefile
+ makefile.cygwin   =>  Cygwin/gcc makefile
  makefile.dec      =>  DEC Alpha UNIX makefile
+ makefile.hpgcc    =>  HPUX makefile using gcc
  makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
- makefile.sgi      =>  Silicon Graphics IRIX makefile
+ makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.intel    =>  Intel C/C++ version 4.0 and later
+ libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
+ makefile.macosx   =>  MACOS X Makefile
+ makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD
+ makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.12beta1)
  makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.5d)
- makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5d)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.12beta1)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.mips     =>  MIPS makefile
  makefile.acorn    =>  Acorn makefile
@@ -61,20 +89,21 @@ include
                        (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
  makefile.atari    =>  Atari makefile
  makefile.beos     =>  BEOS makefile for X86
- makefile.borland  =>  Borland makefile
- build.bat         =>  MS-DOS batch file for Borland compiler
+ makefile.bor      =>  Borland makefile (uses bcc)
+ makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
+ makefile.bd32     =>  To make a png32bd.dll with Borland C++ 4.5
+ makefile.tc3      =>  Turbo C 3.0 makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.msc      =>  Microsoft C makefile
  makefile.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses
-                       assembler code)
+                       assembler code tuned for Intel MMX platform)
  makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does
                        not use assembler code)
- makefile.turboc3  =>  Turbo C 3.0 makefile
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  pngos2.def        =>  OS/2 module definition file used by makefile.os2
  makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
  makevms.com       =>  VMS build script
- pngdll.mak        =>  To make a png32bd.dll with Borland C++ 4.5
+ descrip.mms       =>  VMS makefile for MMS or MMK
  pngdef.pas        =>  Defines for a png32bd.dll with Borland C++ 4.5
  SCOPTIONS.ppc     =>  Used with smakefile.ppc
 
@@ -104,5 +133,5 @@ put the library in its final resting place (if you want to
 do that, run "make install" in the zlib directory first if necessary).
 
 Further information can be found in the README and libpng.txt
-files, in the individual makefiles, in png.h, and the manual pages
-libpng.3 and png.5.
+files, in the individual makefiles, in png.h, in the README files in
+subdirectories of the LIB directory, and the manual pages libpng.3 and png.5.

KNOWNBUG

@@ -1,59 +1,7 @@
 
-Known bugs and suggested enhancements in libpng-1.0.5
+Known bugs in libpng-1.0.11
 
+1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
+   reading interlaced PNG files, when assembler code is enabled.
 
-1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
-
-   Loops need to be optimized everywhere
-
-   Make them count down instead of up -- Kevin Bracey
-
-   Optimizing compilers don't need this, and making
-   the change would be error prone -- Tom Lane, Glenn R-P
-
-   Question whether i-- or --i is better.
-
-   STATUS: Under investigation, postponed until after
-   libpng-1.0.5.  About 160 loops will be turned around
-   in libpng-1.0.Nn, for testing.
-
-2. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
-
-   libpng-1.0.5 and earlier transform colors to gamma=1.0 space for
-   merging with background, and then back to the image's gamma.  The
-   bit_depth of the intermediate (gamma=1.0) representation is probably
-   not sufficient.  In the typical gamma=1/2.2 situation, the linear
-   pixels need about 4 more bits than the gamma-encoded ones, to avoid
-   loss of precision.  A similar situation exists with the rgb_to_gray
-   operation.
-
-   STATUS: under development.
-
-3. September 1999 -- ENHANCEMENT --
-
-   It should be possible to use libpng without floating-point aritmetic.
-
-   STATUS: Under investigation, implementation postponed until after
-   libpng-1.0.5.  The application interface will change because replacements
-   for the png_set_gAMA(), png_set_cHRM(), and corresponding png_get_()
-   functions will be needed.
-
-4. October 1999 -- BUG
-
-   pngvcrd.c is failing for interlaced PNGs that have empty passes.
-
-   STATUS: A check for "width != 0" is required in several places.
-   Fixed in libpng-1.0.5a/1.0.6
-
-5. October 1999 -- BUG
-
-   Under MSVC++6.0 with debugging enabled, heap corruption was detected
-   while destroying the png_write_ptr.
-
-   STATUS:  This was fixed by modifying png_set_text (in pngset.c) to
-   refrain from writing into the user's text_ptr.  With this fix, however,
-   pngwrite.c, while destroying the info_ptr, was failing to free the
-   text->key strings.  Fix for the latter problem is to duplicate code
-   from png.c.
-
-   Fixed in libpng-1.0.5a/1.0.6
+   STATUS: Under investigation.

LICENSE

@@ -1,28 +1,62 @@
-COPYRIGHT NOTICE:
 
-Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
-(libpng versions 0.5, May 1995, through 0.89c, May 1996)
+This copy of the libpng notices is provided for your convenience.  In case of
+any discrepancy between this copy and the notices in the file png.h that is
+included in the libpng distribution, the latter shall prevail.
+
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+
+If you modify libpng you may insert additional notices immediately following
+this sentence.
+
+libpng versions 1.0.7, July 1, 2000, through 1.0.12beta1, May 14, 2001, are
+Copyright (c) 2000, 2001 Glenn Randers-Pehrson
+and are distributed according to the same disclaimer and license as libpng-1.0.6
+with the following individuals added to the list of Contributing Authors
+
+   Simon-Pierre Cadieux
+   Eric S. Raymond
+   Gilles Vollant
+
+and with the following additions to the disclaimer:
+
+   There is no warranty against interference with your enjoyment of the
+   library or against infringement.  There is no warranty that our
+   efforts or the library will fulfill any of your particular purposes
+   or needs.  This library is provided with all faults, and the entire
+   risk of satisfactory quality, performance, accuracy, and effort is with
+   the user.
+
+libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
+Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-0.96,
+with the following individuals added to the list of Contributing Authors:
+
+   Tom Lane
+   Glenn Randers-Pehrson
+   Willem van Schaik
+
+libpng versions 0.89, June 1996, through 0.96, May 1997, are
 Copyright (c) 1996, 1997 Andreas Dilger
-(libpng versions 0.90, December 1996, through 0.96, May 1997)
-Copyright (c) 1998, 1999 Glenn Randers-Pehrson
-(libpng versions 0.97, January 1998, through 1.0.5d, November 29, 1999)
-
-For the purposes of this copyright and license, "Contributing Authors"
-is defined as the following set of individuals:
+Distributed according to the same disclaimer and license as libpng-0.88,
+with the following individuals added to the list of Contributing Authors:
 
    John Bowler
    Kevin Bracey
    Sam Bushell
-   Andreas Dilger
    Magnus Holmgren
-   Tom Lane
-   Dave Martindale
-   Glenn Randers-Pehrson
    Greg Roelofs
+   Tom Tanner
+
+libpng versions 0.5, May 1995, through 0.88, January 1996, are
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+
+For the purposes of this copyright and license, "Contributing Authors"
+is defined as the following set of individuals:
+
+   Andreas Dilger
+   Dave Martindale
    Guy Eric Schalnat
    Paul Schmidt
-   Tom Tanner
-   Willem van Schaik
    Tim Wegner
 
 The PNG Reference Library is supplied "AS IS".  The Contributing Authors
@@ -37,16 +71,13 @@ Permission is hereby granted to use, copy, modify, and distribute this
 source code, or portions hereof, for any purpose, without fee, subject
 to the following restrictions:
 
- 1. The origin of this source code must not be
-    misrepresented.
+1. The origin of this source code must not be misrepresented.
 
- 2. Altered versions must be plainly marked as such
-    and must not be misrepresented as being the
-    original source.
+2. Altered versions must be plainly marked as such and
+   must not be misrepresented as being the original source.
 
- 3. This Copyright notice may not be removed or
-    altered from any source or altered source
-    distribution.
+3. This Copyright notice may not be removed or altered from
+   any source or altered source distribution.
 
 The Contributing Authors and Group 42, Inc. specifically permit, without
 fee, and encourage the use of this source code as a component to
@@ -54,17 +85,18 @@ supporting the PNG file format in commercial products.  If you use this
 source code in a product, acknowledgment is not required but would be
 appreciated.
 
+
 A "png_get_copyright" function is available, for convenient use in "about"
 boxes and the like:
 
    printf("%s",png_get_copyright(NULL));
 
 Also, the PNG logo (in PNG format, of course) is supplied in the
-file "pngnow.png".
+files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
 
-Libpng is OSI Certified Open Source Software.  OSI Certified is a
+Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
 certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 29, 1999
+May 14, 2001

README

@@ -1,8 +1,12 @@
-README for libpng 1.0.5d - November 29, 1999 (shared library 2.1)
+README for libpng 1.0.12beta1 - May 14, 2001 (shared library 2.1)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
 
+Libpng comes in two distribution formats.  Get libpng-*.tar.gz if you
+want UNIX-style line endings in the text files, or lpng*.zip if you want
+DOS-style line endings.
+
 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
 extensive use and testing since mid-1995.  By late 1997 it had
@@ -125,22 +129,27 @@ gladly listen.  Even if your suggestion is not used for version
 
 Files in this distribution:
 
+      ANNOUNCE      =>  Announcement of this version, with recent changes
       CHANGES       =>  Description of changes between libpng versions
+      KNOWNBUG      =>  List of known bugs and deficiencies
+      LICENSE       =>  License to use and redistribute libpng
       README        =>  This file
       TODO          =>  Things not implemented in the current library
-      build.bat     =>  MS-DOS batch file for Borland compiler
-      descrip.mms   =>  VMS project file
+      Y2KINFO       =>  Statement of Y2K compliance
       example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng
+      libpng.3      =>  manual page for libpng (includes libpng.txt)
       libpng.txt    =>  Description of libpng and its functions
       libpngpf.3    =>  manual page for libpng's private functions
       png.5         =>  manual page for the PNG format
       png.c         =>  Basic interface functions common to library
       png.h         =>  Library function and interface declarations
       pngconf.h     =>  System specific library configuration
+      pngasmrd.h    =>  Header file for assembler-coded functions
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
+      pngbar.png    =>  PNG logo, 88x31
+      pngnow.png    =>  PNG logo, 98x31
       pngpread.c    =>  Progressive reading functions
       pngread.c     =>  Read data/helper high-level functions
       pngrio.c      =>  Lowest-level data read I/O functions
@@ -158,22 +167,45 @@ Files in this distribution:
        gregbook         =>  source code for PNG reading and writing, from
                             Greg Roelofs' "PNG: The Definitive Guide",
                             O'Reilly, 1999
+       msvctest     =>  Builds and runs pngtest using a MSVC workspace
        pngminus     =>  Simple pnm2png and png2pnm programs
        pngsuite     =>  Test images
+       visupng      =>  Contains a MSVC workspace for VisualPng
+      projects      =>  Contains project files and workspaces for building DLL
+       beos             =>  Contains a Beos workspace for building libpng
+       borland          =>  Contains a Borland workspace for building libpng
+                            and zlib
+       msvc             =>  Contains a Microsoft Visual C++ (MSVC) workspace
+                            for building libpng and zlib
+       wince            =>  Contains a Microsoft Visual C++ (Windows CD Toolkit)
+                            workspace for building libpng and zlib on WindowsCE
       scripts       =>  Directory containing scripts for building libpng:
        descrip.mms      =>  VMS makefile for MMS or MMK
-       makefile.std     =>  Generic UNIX makefile
+       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
+       makefile.linux   =>  Linux/ELF makefile
+                            (gcc, creates libpng.so.2.1.0.12beta1)
+       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                            libpng.so.2.1.0.12beta1, uses assembler code
+                            tuned for Intel MMX platform)
+       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
        makefile.knr     =>  Archaic UNIX Makefile that converts files with
                             ansi2knr (Requires ansi2knr.c from
                             ftp://ftp.cs.wisc.edu/ghost)
+       makefile.aix     =>  AIX makefile
+       makefile.cygwin  =>  Cygwin/gcc makefile
        makefile.dec     =>  DEC Alpha UNIX makefile
+       makefile.hpgcc   =>  HPUX makefile using gcc
        makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
-       makefile.sgi     =>  Silicon Graphics IRIX makefile
+       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
+       makefile.intel   =>  Intel C/C++ version 4.0 and later
+       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
+       makefile.macosx  =>  MACOS X Makefile
+       makefile.netbsd  =>  NetBSD/cc makefile, uses PNGGCCRD
+       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.12beta1)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.5d)
-       makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng.so.2.1.0.5d)
+                            (gcc, creates libpng.so.2.1.0.12beta1)
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
        makefile.mips    =>  MIPS makefile
        makefile.acorn   =>  Acorn makefile
@@ -183,20 +215,21 @@ Files in this distribution:
                             scripts/SCOPTIONS.ppc)
        makefile.atari   =>  Atari makefile
        makefile.beos    =>  BEOS makefile for X86
-       makefile.borland =>  Borland makefile
-       build.bat        =>  MS-DOS batch file for Borland compiler
+       makefile.bor     =>  Borland makefile (uses bcc)
+       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
+       makefile.bd32    =>  To make a png32bd.dll with Borland C++ 4.5
+       makefile.tc3     =>  Turbo C 3.0 makefile
        makefile.dj2     =>  DJGPP 2 makefile
        makefile.msc     =>  Microsoft C makefile
        makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
-                            later (uses assembler code)
+                            later (uses assembler code tuned for Intel MMX
+                            platform)
        makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
                             later (does not use assembler code)
-       makefile.turboc3 =>  Turbo C 3.0 makefile
        makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
        pngos2.def       =>  OS/2 module definition file used by makefile.os2
        makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
        makevms.com      =>  VMS build script
-       pngdll.mak       =>  To make a png32bd.dll with Borland C++ 4.5
        pngdef.pas       =>  Defines for a png32bd.dll with Borland C++ 4.5
        SCOPTIONS.ppc    =>  Used with smakefile.ppc
 
@@ -204,7 +237,6 @@ Good luck, and happy coding.
 
 -Glenn Randers-Pehrson
  Internet: randeg@alum.rpi.edu
- Web: http://www.rpi.edu/~randeg/index.html
 
 -Andreas Eric Dilger
  Internet: adilger@enel.ucalgary.ca

TODO

@@ -1,14 +1,12 @@
 TODO - list of things to do for libpng:
 
 Final bug fixes.
-Fix problem with C++ and EXTERN "C".
+Improve API by hiding the png_struct and png_info structs.
+Finish work on the no-floating-point version (including gamma compensation)
 Better C++ wrapper/full C++ implementation?
-Keep up with public chunks.
-sPLT chunk handling.
+Fix problem with C++ and EXTERN "C".
 cHRM transformation.
-Support for application-defined chunk handlers.
 Improve setjmp/longjmp usage or remove it in favor of returning error codes.
-High-level API for reading images.
 Add "grayscale->palette" transformation and "palette->grayscale" detection.
 Improved dithering.
 Multi-lingual error and warning message support.
@@ -17,8 +15,10 @@ Man pages for function calls.
 Better documentation.
 Better filter selection
    (counting huffman bits/precompression?  filter inertia?  filter costs?).
-Optional palette (sPLT) creation.
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
-Improve API by hiding the info_ptr.
-Make a no-floating-point version.
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
+Build gamma tables using fixed point (and do away with floating point entirely).
+Use greater precision when changing to linear gamma for compositing against
+  background and doing rgb-to-gray transformation.
+Investigate pre-incremented loop counters and other loop constructions.

Y2KINFO

@@ -1,29 +1,29 @@
    Y2K compliance in libpng:
    =========================
-      
-      November 29, 1999
-      
+
+      May 14, 2001
+
       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
-      
+
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.0.5d are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.12beta1 are Y2K compliant.  It is my belief that earlier
       versions were also Y2K compliant.
-      
+
       Libpng only has three year fields.  One is a 2-byte unsigned integer
       that will hold years up to 65535.  The other two hold the date in text
       format, and will hold years up to 9999.
-      
+
       The integer is
           "png_uint_16 year" in png_time_struct.
-      
+
       The strings are
           "png_charp time_buffer" in png_struct and
           "near_time_buffer", which is a local character string in png.c.
-      
+
       There are seven time-related functions:
 
-          png_convert_to_rfc_1123() in png.c 
+          png_convert_to_rfc_1123() in png.c
             (formerly png_convert_to_rfc_1152() in error)
           png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
           png_convert_from_time_t() in pngwrite.c
@@ -31,8 +31,8 @@
           png_handle_tIME() in pngrutil.c, called in pngread.c
           png_set_tIME() in pngset.c
           png_write_tIME() in pngwutil.c, called in pngwrite.c
-      
-      All appear to handle dates properly in a Y2K environment.  The 
+
+      All appear to handle dates properly in a Y2K environment.  The
       png_convert_from_time_t() function calls gmtime() to convert from system
       clock time, which returns (year - 1900), which we properly convert to
       the full 4-digit year.  There is a possibility that applications using
@@ -42,14 +42,14 @@
       but this is not under our control.  The libpng documentation has always
       stated that it works with 4-digit years, and the APIs have been
       documented as such.
-      
+
       The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
       integer to hold the year, and can hold years as large as 65535.
 
       zlib, upon which libpng depends, is also Y2K compliant.  It contains
       no date-related code.
-      
-      
+
+
          Glenn Randers-Pehrson
          libpng maintainer
          PNG Development Group

configure

@@ -0,0 +1,6 @@
+echo "
+  There is no \"configure\" script for Libpng-1.0.12beta1.  Instead, please
+  copy the appropriate makefile for your system from the \"scripts\"
+  directory.  Read the INSTALL file for more details.
+"
+

contrib/gregbook/LICENSE

@@ -0,0 +1,26 @@
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+  ---------------------------------------------------------------------------

contrib/gregbook/Makefile.sgi

@@ -0,0 +1,102 @@
+# Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.
+# Greg Roelofs
+# Last modified:  16 January 1000
+#
+#	The programs built by this makefile are described in the book,
+#	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#	Associates, 1999).  Go buy a copy, eh?  Buy some for friends
+#	and family, too.  (Not that this is a blatant plug or anything.)
+#
+# Invoke this makefile from a shell prompt in the usual way; for example:
+#
+#	make -f Makefile.sgi
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are both installed in /usr/local/{include,lib} (as indicated by the
+# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIB, ZINC and ZLIB lines.
+#
+# This makefile builds dynamically linked executables (against libpng and zlib,
+# that is), but that can be changed by uncommenting the appropriate PNGLIB and
+# ZLIB lines.
+
+
+# macros --------------------------------------------------------------------
+
+PNGINC = -I/usr/local/include
+PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
+#PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+# or:
+#PNGINC = -I../..
+#PNGLIB = -L../.. -lpng
+#PNGLIB = ../../libpng.a
+
+ZINC = -I/usr/local/include
+ZLIB = -L/usr/local/lib -lz		# dynamically linked against zlib
+#ZLIB = /usr/local/lib/libz.a		# statically linked against zlib
+#ZINC = -I../zlib
+#ZLIB = -L../zlib -lz
+#ZLIB = ../../../zlib/libz.a
+
+XINC = -I/usr/include/X11		# old-style, stock X distributions
+XLIB = -L/usr/lib/X11 -lX11
+#XINC = -I/usr/openwin/include    	# Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+#XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
+#XLIB = -L/usr/X11R6/lib -lX11
+
+INCS = $(PNGINC) $(ZINC) $(XINC)
+RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)
+
+CC = cc
+LD = cc
+RM = rm -f
+CFLAGS = -O -fullwarn $(INCS)
+LDFLAGS =
+O = .o
+E =
+
+RPNG  = rpng-x
+RPNG2 = rpng2-x
+WPNG  = wpng
+
+ROBJS  = $(RPNG)$(O) readpng$(O)
+ROBJS2 = $(RPNG2)$(O) readpng2$(O)
+WOBJS  = $(WPNG)$(O) writepng$(O)
+
+EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+	$(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNG)$(E): $(ROBJS)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
+
+$(RPNG2)$(E): $(ROBJS2)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
+
+$(WPNG)$(E): $(WOBJS)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
+
+$(RPNG)$(O):	$(RPNG).c readpng.h
+$(RPNG2)$(O):	$(RPNG2).c readpng2.h
+$(WPNG)$(O):	$(WPNG).c writepng.h
+
+readpng$(O):	readpng.c readpng.h
+readpng2$(O):	readpng2.c readpng2.h
+writepng$(O):	writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+	$(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

contrib/gregbook/Makefile.unx

@@ -1,6 +1,6 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  16 February 1999
+# Last modified:  28 February 2000
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
@@ -9,11 +9,12 @@
 #
 # Invoke this makefile from a shell prompt in the usual way; for example:
 #
-#	make -f makefile.unx
+#	make -f Makefile.unx
 #
 # This makefile assumes libpng and zlib have already been built or downloaded
 # and are both installed in /usr/local/{include,lib} (as indicated by the
-# PNGPATH and ZPATH macros below).  Edit as appropriate.
+# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIB, ZINC and ZLIB lines.
 #
 # This makefile builds statically linked executables (against libpng and zlib,
 # that is), but that can be changed by uncommenting the appropriate PNGLIB and
@@ -22,30 +23,38 @@
 
 # macros --------------------------------------------------------------------
 
-PNGPATH = /usr/local
-PNGINC = -I$(PNGPATH)/include
-#PNGLIB = -L$(PNGPATH)/lib -lpng
-PNGLIB = $(PNGPATH)/lib/libpng.a
+PNGINC = -I/usr/local/include
+#PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
+PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+# or:
+#PNGINC = -I../..
+#PNGLIB = -L../.. -lpng
+#PNGLIB = ../../libpng.a
 
-ZPATH = /usr/local
-ZINC = -I$(ZPATH)/include
-#ZLIB = -L$(ZPATH)/lib -lz
-ZLIB = $(ZPATH)/lib/libz.a
+ZINC = -I/usr/local/include
+#ZLIB = -L/usr/local/lib -lz		# dynamically linked against zlib
+ZLIB = /usr/local/lib/libz.a		# statically linked against zlib
+#ZINC = -I../zlib
+#ZLIB = -L../zlib -lz
+#ZLIB = ../../../zlib/libz.a
 
-#XPATH = /usr/X11
-XPATH = /usr/X11R6
-XINC = -I$(XPATH)/include
-XLIB = -L$(XPATH)/lib -lX11
+#XINC = -I/usr/include/X11		# old-style, stock X distributions
+#XLIB = -L/usr/lib/X11 -lX11
+#XINC = -I/usr/openwin/include    	# Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
+XLIB = -L/usr/X11R6/lib -lX11
 
 INCS = $(PNGINC) $(ZINC) $(XINC)
 RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
-WLIBS = $(PNGLIB) $(ZLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)
 
 CC = gcc
 LD = gcc
 RM = rm -f
 CFLAGS = -O -Wall $(INCS)
-# [note that -Wall is a gcc-specific compilation flag ("all warnings on")]
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+# [-ansi, -pedantic and -W can also be used]
 LDFLAGS =
 O = .o
 E =

contrib/gregbook/Makefile.w32

@@ -10,7 +10,7 @@
 # Invoke this makefile from a DOS prompt window via:
 #
 #	%devstudio%\vc\bin\vcvars32.bat
-#	nmake -nologo -f makefile.w32
+#	nmake -nologo -f Makefile.w32
 #
 # where %devstudio% is the installation directory for MSVC / DevStudio.  If
 # you get "environment out of space" errors, create a desktop shortcut with
@@ -32,12 +32,12 @@
 
 # macros --------------------------------------------------------------------
 
-PNGPATH = ../libpng
+PNGPATH = ../..
 PNGINC = -I$(PNGPATH)
 #PNGLIB = $(PNGPATH)/pngdll.lib
 PNGLIB = $(PNGPATH)/libpng.lib
 
-ZPATH = ../zlib
+ZPATH = ../../../zlib
 ZINC = -I$(ZPATH)
 #ZLIB = $(ZPATH)/zlibdll.lib
 ZLIB = $(ZPATH)/zlibstat.lib

contrib/gregbook/README

@@ -1,52 +1,183 @@
-PNG: The Definitive Guide: Source Code
+                     ===========================
+                      PNG: The Definitive Guide
+                     ===========================
 
-Chapters 13, 14 and 15 of PNG: The Definitive Guide discuss three
+                             Source Code
+
+Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
 cross-platform demo programs that show how to use the libpng reference
-library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is a
-very simple example that that shows how a standard file-viewer might use
-libpng, while the second is designed to process streaming data and shows how
-a web browser might be written. wpng is a simple command-line program that
-reads binary PPM files (the ``raw'' RGB subset of NetPBM) and converts them
-to PNG.
+library:  rpng, rpng2 and wpng.  rpng and rpng2 are viewers; the first is
+a very simple example that that shows how a standard file-viewer might use
+libpng, while the second is designed to process streaming data and shows
+how a web browser might be written.  wpng is a simple command-line program
+that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
+of PBMPLUS/NetPBM) and converts them to PNG.
 
-The source code for all three demo programs currently compiles only under
-Unix and 32-bit Windows. It has been tested with gcc 2.7.2.3 under Linux and
-Solaris and with Microsoft Visual C++ 5.0 under Windows 95. Brief
-instructions for compiling the programs are included at the top of the
-makefiles; makefile.unx is the Unix version, and makefile.w32 is (you
-guessed it!) the version for 32-bit Windows. libpng and zlib are required.
+The source code for all three demo programs currently compiles under
+Unix, OpenVMS, and 32-bit Windows.  (Special thanks to Martin Zinser,
+zinser@decus.de, for making the necessary changes for OpenVMS and for
+providing an appropriate build script.)  Build instructions can be
+found below.
 
-----------------------------------------------------------------------------
+Files:
 
-License
+   README             this file
+   README.w32         additional Windows-specific information
+   LICENSE            terms of distribution and reuse (BSD-like)
 
-The source code to the demo programs may be used and distributed freely
-(even if you didn't buy the book--but feel free to do so at any time),
-subject to the terms of the following BSD-like license:
+   Makefile.unx       Unix makefile
+   Makefile.w32       Windows (MSVC) makefile
+   makevms.com        OpenVMS build script
 
-     Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
+   rpng-win.c         Windows front end for the basic viewer
+   rpng-x.c           X Window System (Unix, OpenVMS) front end
+   readpng.c          generic back end for the basic viewer
+   readpng.h          header file for the basic viewer
 
-     This software is provided "as is," without warranty of any kind,
-     express or implied. In no event shall the author or contributors
-     be held liable for any damages arising in any way from the use of
-     this software.
+   rpng2-win.c        Windows front end for the progressive viewer
+   rpng2-x.c          X front end for the progressive viewer
+   readpng2.c         generic back end for the progressive viewer
+   readpng2.h         header file for the progressive viewer
 
-     Permission is granted to anyone to use this software for any
-     purpose, including commercial applications, and to alter it and
-     redistribute it freely, subject to the following restrictions:
+   wpng.c             generic (text) front end for the converter
+   writepng.c         generic back end for the converter
+   writepng.h         header file for the converter
 
-       1. Redistributions of source code must retain the above
-          copyright notice, disclaimer, and this list of conditions.
-       2. Redistributions in binary form must reproduce the above
-          copyright notice, disclaimer, and this list of conditions in
-          the documentation and/or other materials provided with the
-          distribution.
-       3. All advertising materials mentioning features or use of this
-          software must display the following acknowledgment:
+   toucan.png         transparent PNG for testing (by Stefan Schneider)
 
-               This product includes software developed by Greg Roelofs
-               and contributors for the book, "PNG: The Definitive
-               Guide," published by O'Reilly and Associates.
+Note that the programs are designed to be functional, but their primary
+purpose is to demonstrate how to use libpng to add PNG support to other
+programs.  As such, their user interfaces are crude and definitely not
+intended for everyday use.
 
-----------------------------------------------------------
-http://www.cdrom.com/pub/png/book/sources.html
+Please see http://www.cdrom.com/pub/png/pngbook.html for further infor-
+mation and links to the latest version of the source code, and Chapters
+13-15 of the book for detailed discussion of the three programs.
+
+Greg Roelofs
+19 March 2000
+
+
+BUILD INSTRUCTIONS
+
+ - Prerequisites:
+
+      - zlib		ftp://ftp.cdrom.com/pub/infozip/zlib/zlib.html
+      - libpng		http://www.cdrom.com/pub/png/pngcode.html
+      - pngbook		http://www.cdrom.com/pub/png/book/sources.html
+
+     The pngbook demo programs are explicitly designed to demonstrate proper
+     coding techniques for using the libpng reference library.  As a result,
+     you need to download and build both zlib (on which libpng depends) and
+     libpng.  A common build setup is to place the zlib, libpng and pngbook
+     subdirectory trees ("folders") in the same parent directory.  Then the
+     libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
+     and similarly for the pngbook build.
+
+     Note that all three packages are designed to be built from a command
+     line by default; those who wish to use a graphical or other integrated
+     development environments are on their own.
+
+
+ - Unix:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a directory and change into that directory.
+
+     Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
+     appropriately (possibly also the X* variables if necessary).
+
+     make
+
+     There is no "install" target, so copy the three executables somewhere
+     in your path or run them from the current directory.  All three will
+     print a basic usage screen when run without any command-line arguments;
+     see the book for more details.
+
+
+ - Windows:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a folder, open a "DOS shell" or "command prompt"
+     or equivalent command-line window, and cd into the folder where you
+     unpacked the source code.
+
+     For MSVC, set up the necessary environment variables by invoking
+ 
+        %devstudio%\vc\bin\vcvars32.bat
+
+     where where %devstudio% is the installation directory for MSVC /
+     DevStudio.  If you get "environment out of space" errors under 95/98,
+     create a desktop shortcut with "c:\windows\command.com /e:4096" as
+     the program command line and set the working directory to the pngbook
+     directory.  Then double-click to open the new DOS-prompt window with
+     a bigger environment and retry the commands above.
+
+     Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
+     appropriately (possibly also the "INC" and "LIB" variables if needed).
+     Note that the names of the dynamic and static libpng and zlib libraries
+     used in the makefile may change in later releases of the libraries.
+     Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
+     This makefile therefore builds statically linked executables, but if
+     the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
+     and ZLIB lines will build dynamically linked executables instead.
+
+     Do the build by typing
+
+        nmake
+
+     The result should be three executables:  rpng-win.exe, rpng2-win.exe,
+     and wpng.exe.  Copy them somewhere in your PATH or run them from the
+     current folder.  Unlike the Unix versions, the two windowed programs
+     (rpng and rpng2) do not display a usage screen when invoked without
+     command-line arguments; see README.w32 for brief help or the book for
+     details.  Note that the programs use the Unix-style "-" character to
+     specify options, instead of the more common DOS/Windows "/" character.
+
+
+ - OpenVMS:
+
+     Unpack the pngbook sources into a subdirectory and change into that
+     subdirectory.
+
+     Edit makevms.com appropriately, specifically the zpath and pngpath
+     variables.
+
+     @makevms
+
+     To run the programs, they probably first need to be set up as "foreign
+     symbols," with "disk" and "dir" set appropriately:
+
+     $ rpng == "$disk:[dir]rpng-x.exe"
+     $ rpng2 == "$disk:[dir]rpng2-x.exe"
+     $ wpng == "$disk:[dir]wpng.exe"
+
+     All three will print a basic usage screen when run without any command-
+     line arguments; see the book for more details.  Note that the options
+     style is Unix-like, i.e., preceded by "-" rather than "/".
+
+
+RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
+
+     rpng is a simple PNG viewer that can display transparent PNGs with a
+     specified background color; for example,
+
+	rpng -bgcolor #ff0000 toucan.png
+
+     would display the image with a red background.  rpng2 is a progressive
+     viewer that simulates a web browser in some respects; it can display
+     images against either a background color or a dynamically generated
+     background image.  For example:
+
+	rpng2 -bgpat 16 toucan.png
+
+     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
+     format (.pgm or .ppm) to PNG; for example,
+
+	wpng -time < toucan.ppm > toucan.png
+
+     would convert the specified PPM file (using redirection) to PNG, auto-
+     matically setting the PNG modification-time chunk.
+
+     All options can be abbreviated to the shortest unique value; for example,
+     "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.

contrib/gregbook/README.w32

@@ -0,0 +1,53 @@
+See the main README file for basic instructions on compiling and running
+the programs.  See http://www.cdrom.com/pub/png/pngbook.html for further
+information and links to the source code, and Chapters 13-15 of the book
+for detailed discussion of the three programs.
+
+Since the two viewers, rpng and rpng2, are both designed to write infor-
+mation to the console (i.e., a DOS-window command line) while displaying
+the image in a graphical window--and since I haven't yet figured out how
+to do that under Windows--here are the usage screens for the two programs:
+
+
+rpng-win 1.02 of 19 March 2000:  Simple PNG Viewer for Windows
+   Compiled with libpng 1.0.5; using libpng 1.0.5.
+   Compiled with zlib 1.1.3; using zlib 1.1.3.
+
+Usage:  rpng-win [-gamma exp] [-bgcolor bg] file.png
+    exp 	transfer-function exponent (``gamma'') of the display
+		  system in floating-point format (e.g., ``2.2''); equal
+		  to the product of the lookup-table exponent (varies)
+		  and the CRT exponent (usually 2.2); must be positive
+    bg  	desired background color in 7-character hex RGB format
+		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
+		  used with transparent images
+
+Press Q, Esc or mouse button 1 after image is displayed to quit.
+
+
+rpng2-win 1.04 of 19 March 2000:  Progressive PNG Viewer for Windows
+   Compiled with libpng 1.0.5; using libpng 1.0.5.
+   Compiled with zlib 1.1.3; using zlib 1.1.3.
+
+Usage:  rpng2-win [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing] file.png
+
+    exp 	transfer-function exponent (``gamma'') of the display
+		  system in floating-point format (e.g., ``2.2''); equal
+		  to the product of the lookup-table exponent (varies)
+		  and the CRT exponent (usually 2.2); must be positive
+    bg  	desired background color in 7-character hex RGB format
+		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
+		  used with transparent images; overrides -bgpat
+    pat 	desired background pattern number (1-16); used with
+		  transparent images; overrides -bgcolor
+    -timing	enables delay for every block read, to simulate modem
+		  download of image (~36 Kbps)
+
+Press Q, Esc or mouse button 1 after image is displayed to quit.
+
+
+The usage screen for the third (non-windowed) program, wpng, can be seen
+simply by invoking it without any parameters (``wpng'').
+
+Greg Roelofs
+19 March 2000

contrib/gregbook/makevms.com

@@ -1,11 +1,35 @@
 $!------------------------------------------------------------------------------
-$! make Contrib programs of libpng under OpenVMS
+$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS
+$!
+$! Script created by Martin Zinser for libpng; modified by Greg Roelofs
+$! for standalone pngbook source distribution.
 $!
 $!
-$! Look for the compiler used
+$!    Set locations where zlib and libpng sources live.
 $!
-$ zlibsrc = "[---.zlib]"
-$ ccopt="/include=(''zlibsrc',[--])"
+$ zpath   = ""
+$ pngpath = ""
+$ if f$search("[-.zlib]zlib.h").nes."" then zpath = "[-.zlib]"
+$ if f$search("[-.libpng]png.h").nes."" then pngpath = "[-.libpng]"
+$!
+$ if f$search("[---.zlib]zlib.h").nes."" then zpath = "[---.zlib]"
+$ if f$search("[--]png.h").nes."" then pngpath = "[--]"
+$!
+$ if zpath .eqs. ""
+$ then
+$   write sys$output "Zlib include not found. Exiting..."
+$   exit 2
+$ endif 
+$!
+$ if pngpath .eqs. ""
+$ then
+$   write sys$output "Libpng include not found. Exiting..."
+$   exit 2
+$ endif 
+$!
+$!    Look for the compiler used.
+$!
+$ ccopt="/include=(''zpath',''pngpath')"
 $ if f$getsyi("HW_MODEL").ge.1024
 $ then
 $  ccopt = "/prefix=all"+ccopt
@@ -29,13 +53,16 @@ $    comp  = "__decc__=1"
 $  endif
 $ endif
 $ open/write lopt lib.opt
-$ write lopt "[--]libpng.olb/lib"
-$ write lopt "''zlibsrc'libz.olb/lib"
+$ write lopt "''pngpath'libpng.olb/lib"
+$ write lopt "''zpath'libz.olb/lib"
 $ close lopt
 $ open/write xopt x11.opt
 $ write xopt "sys$library:decw$xlibshr.exe/share"
 $ close xopt
-$ write sys$output "Compiling PNG contrib programs ..."
+$!
+$!    Build 'em.
+$!
+$ write sys$output "Compiling PNG book programs ..."
 $   CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -
 	readpng.c readpng.h
 $   CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -
@@ -45,20 +72,20 @@ $   CALL MAKE writepng.OBJ "cc ''CCOPT' writepng" -
 $   write sys$output "Building rpng-x..."
 $   CALL MAKE rpng-x.OBJ "cc ''CCOPT' rpng-x" -
 	rpng-x.c readpng.h
-$   call make rpng-x.exe - 
-	"LINK rpng-x,readpng,lib.opt/opt,x11.opt/opt" - 
+$   call make rpng-x.exe -
+	"LINK rpng-x,readpng,lib.opt/opt,x11.opt/opt" -
 	rpng-x.obj readpng.obj
 $   write sys$output "Building rpng2-x..."
 $   CALL MAKE rpng2-x.OBJ "cc ''CCOPT' rpng2-x" -
 	rpng2-x.c readpng2.h
-$   call make rpng2-x.exe - 
-	"LINK rpng2-x,readpng2,lib.opt/opt,x11.opt/opt" - 
+$   call make rpng2-x.exe -
+	"LINK rpng2-x,readpng2,lib.opt/opt,x11.opt/opt" -
 	rpng2-x.obj readpng2.obj
 $   write sys$output "Building wpng..."
 $   CALL MAKE wpng.OBJ "cc ''CCOPT' wpng" -
 	wpng.c writepng.h
-$   call make wpng.exe - 
-	"LINK wpng,writepng,lib.opt/opt" - 
+$   call make wpng.exe -
+	"LINK wpng,writepng,lib.opt/opt" -
 	wpng.obj writepng.obj
 $ exit
 $!

contrib/gregbook/readpng.c

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -32,8 +32,13 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "png.h"	/* libpng header; includes zlib.h */
-#include "readpng.h"	/* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h */
+#include "readpng.h"    /* typedefs, common macros, public prototypes */
+
+/* future versions of libpng will provide this macro: */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
+#endif
 
 
 static png_structp png_ptr = NULL;
@@ -44,18 +49,18 @@ int  bit_depth, color_type;
 uch  *image_data = NULL;
 
 
-void readpng_version_info()
+void readpng_version_info(void)
 {
     fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
       PNG_LIBPNG_VER_STRING, png_libpng_ver);
     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
       ZLIB_VERSION, zlib_version);
-} 
+}
 
 
 /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
 
-int readpng_init(FILE *infile, long *pWidth, long *pHeight)
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
 {
     uch sig[8];
 
@@ -89,7 +94,7 @@ int readpng_init(FILE *infile, long *pWidth, long *pHeight)
     /* setjmp() must be called in every function that calls a PNG-reading
      * libpng function */
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
         return 2;
     }
@@ -130,7 +135,7 @@ int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
     /* setjmp() must be called in every function that calls a PNG-reading
      * libpng function */
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
         return 2;
     }
@@ -184,7 +189,7 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
     /* setjmp() must be called in every function that calls a PNG-reading
      * libpng function */
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
         return NULL;
     }

contrib/gregbook/readpng.h

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -54,7 +54,7 @@ typedef unsigned long   ulg;
 
 void readpng_version_info(void);
 
-int readpng_init(FILE *infile, long *pWidth, long *pHeight);
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
 
 int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
 

contrib/gregbook/readpng2.c

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -30,10 +30,10 @@
   ---------------------------------------------------------------------------*/
 
 
-#include <stdlib.h>	/* for exit() prototype */
+#include <stdlib.h>     /* for exit() prototype */
 
-#include "png.h"	/* libpng header; includes zlib.h and setjmp.h */
-#include "readpng2.h"	/* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include "readpng2.h"   /* typedefs, common macros, public prototypes */
 
 
 /* local prototypes */
@@ -47,13 +47,14 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
 
 
 
-void readpng2_version_info()
+void readpng2_version_info(void)
 {
     fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
       PNG_LIBPNG_VER_STRING, png_libpng_ver);
+
     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
       ZLIB_VERSION, zlib_version);
-} 
+}
 
 
 
@@ -70,7 +71,7 @@ int readpng2_check_sig(uch *sig, int num)
 
 int readpng2_init(mainprog_info *mainprog_ptr)
 {
-    png_structp  png_ptr;	/* note:  temporary variables! */
+    png_structp  png_ptr;       /* note:  temporary variables! */
     png_infop  info_ptr;
 
 
@@ -110,7 +111,6 @@ int readpng2_init(mainprog_info *mainprog_ptr)
     png_set_progressive_read_fn(png_ptr, mainprog_ptr,
       readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
 
-
     /* make sure we save our pointers for use in readpng2_decode_data() */
 
     mainprog_ptr->png_ptr = png_ptr;
@@ -176,7 +176,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
 
     mainprog_ptr = png_get_progressive_ptr(png_ptr);
 
-    if (mainprog_ptr == NULL) {		/* we be hosed */
+    if (mainprog_ptr == NULL) {         /* we be hosed */
         fprintf(stderr,
           "readpng2 error:  main struct not recoverable in info_callback.\n");
         fflush(stderr);
@@ -283,7 +283,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
 
     png_read_update_info(png_ptr, info_ptr);
 
-    mainprog_ptr->rowbytes = png_get_rowbytes(png_ptr, info_ptr);
+    mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);
     mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);
 
 
@@ -323,6 +323,11 @@ static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
     mainprog_ptr = png_get_progressive_ptr(png_ptr);
 
 
+    /* save the pass number for optional use by the front end */
+
+    mainprog_ptr->pass = pass;
+
+
     /* have libpng either combine the new row data with the existing row data
      * from previous passes (if interlaced) or else just copy the new row
      * into the main program's image buffer */
@@ -408,7 +413,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
     fflush(stderr);
 
     mainprog_ptr = png_get_error_ptr(png_ptr);
-    if (mainprog_ptr == NULL) {		/* we are completely hosed now */
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
         fprintf(stderr,
           "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");
         fflush(stderr);

contrib/gregbook/readpng2.h

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -61,10 +61,16 @@ typedef struct _mainprog_info {
     uch *image_data;
     uch **row_pointers;
     jmp_buf jmpbuf;
-    int passes;			/* not used */
+    int passes;              /* not used */
+    int pass;
     int rowbytes;
     int channels;
     int need_bgcolor;
+#if (defined(__i386__) || defined(_M_IX86))
+    int nommxfilters;
+    int nommxcombine;
+    int nommxinterlace;
+#endif
     int done;
     uch bg_red;
     uch bg_green;

contrib/gregbook/rpng-win.c

@@ -16,7 +16,16 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.00:  initial public release
+    - 1.01:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -43,7 +52,7 @@
 
 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "1.0 of 20 February 1999"
+#define VERSION   "1.02 of 19 March 2000"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -53,7 +62,7 @@
 
 /* #define DEBUG  :  this enables the Trace() macros */
 
-#include "readpng.h"	/* typedefs, common macros, readpng prototypes */
+#include "readpng.h"    /* typedefs, common macros, readpng prototypes */
 
 
 /* could just include png.h, but this macro is the only thing we need
@@ -61,10 +70,10 @@
  * only happen with alpha (which could easily be avoided with
  * "ush acopy = (alpha);") */
 
-#define alpha_composite(composite, fg, alpha, bg) {			\
-    ush temp = ((ush)(fg)*(ush)(alpha) +				\
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);	\
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);			\
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }
 
 
@@ -78,7 +87,7 @@ LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;	/* GRR:  not (yet) used */
+static char *icon_name = PROGNAME;     /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
 
@@ -104,15 +113,15 @@ static HWND global_hwnd;
 
 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
 {
-    char *args[1024];		/* arbitrary limit, but should suffice */
+    char *args[1024];                 /* arbitrary limit, but should suffice */
     char *p, *q, **argv = args;
     int argc = 0;
     int rc, alen, flen;
     int error = 0;
     int have_bg = FALSE;
-    double LUT_exponent;		/* just the lookup table */
-    double CRT_exponent = 2.2;		/* just the monitor */
-    double default_display_exponent;	/* whole display system */
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
     MSG msg;
 
 
@@ -150,7 +159,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     LUT_exponent = 1.8 / 2.61;
     /*
     if (some_mac_function_that_returns_gamma(&mac_gamma))
-        LUT_exponent = mac_gamma / 2.61;                 
+        LUT_exponent = mac_gamma / 2.61;
      */
 #else
     LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
@@ -199,20 +208,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     /* Now parse the command line for options and the PNG filename. */
 
     while (*++argv && !error) {
-        if (!strcmp(*argv, "-gamma")) {
+        if (!strncmp(*argv, "-gamma", 2)) {
             if (!*++argv)
                 ++error;
-            display_exponent = atof(*argv);
-            if (display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
             if (!*++argv)
                 ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
-            else
-                have_bg = TRUE;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else
+                    have_bg = TRUE;
+            }
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -255,6 +268,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
             fclose(infile);
     }
 
+
+    /* usage screen */
+
     if (error) {
         fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
         readpng_version_info();
@@ -265,7 +281,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "\t\t  to the product of the lookup-table exponent (varies)\n"
          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
          "    bg  \tdesired background color in 7-character hex RGB format\n"
-         "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
+         "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
          "\t\t  used with transparent images\n"
          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
          "\n", PROGNAME, default_display_exponent);
@@ -336,6 +352,10 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
 
     /* wait for the user to tell us when to quit */
 
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+
     while (GetMessage(&msg, NULL, 0, 0)) {
         TranslateMessage(&msg);
         DispatchMessage(&msg);
@@ -371,7 +391,7 @@ static int rpng_win_create_window(HINSTANCE hInst, int showmode)
     if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
                               wimage_rowbytes*image_height)))
     {
-        return 4;	/* fail */
+        return 4;   /* fail */
     }
 
 /*---------------------------------------------------------------------------
@@ -477,7 +497,7 @@ static int rpng_win_display_image()
                 g = *src++;
                 b = *src++;
                 *dest++ = b;
-                *dest++ = g;	/* note reverse order */
+                *dest++ = g;   /* note reverse order */
                 *dest++ = r;
             }
         } else /* if (image_channels == 4) */ {
@@ -582,15 +602,15 @@ LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
 
         /* wait for the user to tell us when to quit */
         case WM_CHAR:
-            switch (wP) {	/* only need one, so ignore repeat count */
+            switch (wP) {      /* only need one, so ignore repeat count */
                 case 'q':
                 case 'Q':
-                case 0x1B:	/* Esc key */
+                case 0x1B:     /* Esc key */
                     PostQuitMessage(0);
             }
             return 0;
 
-        case WM_LBUTTONDOWN:	/* another way of quitting */
+        case WM_LBUTTONDOWN:   /* another way of quitting */
         case WM_DESTROY:
             PostQuitMessage(0);
             return 0;

contrib/gregbook/rpng-x.c

@@ -5,8 +5,8 @@
    This program decodes and displays PNG images, with gamma correction and
    optionally with a user-specified background color (in case the image has
    transparency).  It is very nearly the most basic PNG viewer possible.
-   This version is for the X Window System (tested under Unix, but may work
-   under VMS or OS/2 with a little tweaking).
+   This version is for the X Window System (tested by author under Unix and
+   by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).
 
    to do:
     - 8-bit support
@@ -14,7 +14,17 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -41,7 +51,7 @@
 
 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.11 of 19 March 2000"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -54,18 +64,18 @@
 
 /* #define DEBUG  :  this enables the Trace() macros */
 
-#include "readpng.h"	/* typedefs, common macros, readpng prototypes */
+#include "readpng.h"   /* typedefs, common macros, readpng prototypes */
 
 
 /* could just include png.h, but this macro is the only thing we need
- * (name and typedefs changed to local versions); note that side effects 
- * only happen with alpha (which could easily be avoided with 
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
  * "ush acopy = (alpha);") */
 
-#define alpha_composite(composite, fg, alpha, bg) {			\
-    ush temp = ((ush)(fg)*(ush)(alpha) +				\
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);	\
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);			\
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }
 
 
@@ -95,15 +105,16 @@ static uch *image_data;
 static char *displayname;
 static XImage *ximage;
 static Display *display;
-static int bitmap_order;
 static int depth;
 static Visual *visual;
-static int RPixelShift, GPixelShift, BPixelShift;
-static ulg RedMask, GreenMask, BlueMask;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
 static Window window;
 static GC gc;
 static Colormap colormap;
 
+static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;
 /*
@@ -123,9 +134,9 @@ int main(int argc, char **argv)
     int rc, alen, flen;
     int error = 0;
     int have_bg = FALSE;
-    double LUT_exponent;		/* just the lookup table */
-    double CRT_exponent = 2.2;		/* just the monitor */
-    double default_display_exponent;	/* whole display system */
+    double LUT_exponent;               /* just the lookup table */
+    double CRT_exponent = 2.2;         /* just the monitor */
+    double default_display_exponent;   /* whole display system */
     XEvent e;
     KeySym k;
 
@@ -188,24 +199,29 @@ int main(int argc, char **argv)
     /* Now parse the command line for options and the PNG filename. */
 
     while (*++argv && !error) {
-        if (!strcmp(*argv, "-display")) {
+        if (!strncmp(*argv, "-display", 2)) {
             if (!*++argv)
                 ++error;
-            displayname = *argv;
-        } else if (!strcmp(*argv, "-gamma")) {
-            if (!*++argv)
-                ++error;
-            display_exponent = atof(*argv);
-            if (display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
             else
-                have_bg = TRUE;
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error; 
+                else 
+                    have_bg = TRUE;
+            }
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -222,8 +238,7 @@ int main(int argc, char **argv)
         fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
         ++error;
     } else {
-        if ((rc = readpng_init(infile, (long *)(&image_width), 
-                               (long *)(&image_height))) != 0) {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
             switch (rc) {
                 case 1:
                     fprintf(stderr, PROGNAME
@@ -257,21 +272,25 @@ int main(int argc, char **argv)
             fclose(infile);
     }
 
+
+    /* usage screen */
+
     if (error) {
         fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
         readpng_version_info();
         fprintf(stderr, "\n"
-         "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
-         "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
-         "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-         "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-         "\t\t  to the product of the lookup-table exponent (varies)\n"
-         "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-         "    bg  \tdesired background color in 7-character hex RGB format\n"
-         "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
-         "\t\t  used with transparent images\n"
-         "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-         "\n", PROGNAME, default_display_exponent);
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME, default_display_exponent);
         exit(1);
     }
 
@@ -344,6 +363,10 @@ int main(int argc, char **argv)
 
     /* wait for the user to tell us when to quit */
 
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+
     do
         XNextEvent(display, &e);
     while (!(e.type == ButtonPress && e.xbutton.button == Button1) &&
@@ -362,11 +385,13 @@ int main(int argc, char **argv)
 
 
 
-static int rpng_x_create_window()
+static int rpng_x_create_window(void)
 {
     uch *xdata;
+    int need_colormap = FALSE;
     int screen, pad;
     ulg bg_pixel = 0L;
+    ulg attrmask;
     Window root;
     XEvent e;
     XGCValues gcvalues;
@@ -378,11 +403,15 @@ static int rpng_x_create_window()
     XWMHints *wm_hints;
 
 
-    bitmap_order = BitmapBitOrder(display);
     screen = DefaultScreen(display);
     depth = DisplayPlanes(display, screen);
     root = RootWindow(display, screen);
 
+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+#if 0
 /* GRR:  add 8-bit support */
     if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
         fprintf(stderr,
@@ -394,27 +423,73 @@ static int rpng_x_create_window()
     XMatchVisualInfo(display, screen, depth,
       (depth == 8)? PseudoColor : TrueColor, &visual_info);
     visual = visual_info.visual;
+#else
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;
 
-    RedMask   = visual->red_mask;
-    GreenMask = visual->green_mask;
-    BlueMask  = visual->blue_mask;
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
+    }
+#endif
+
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;
 
 /* GRR:  add/check 8-bit support */
-    if (depth == 8) {
+    if (depth == 8 || need_colormap) {
         colormap = XCreateColormap(display, root, visual, AllocNone);
         if (!colormap) {
             fprintf(stderr, "XCreateColormap() failed\n");
             return 2;
         }
         have_colormap = TRUE;
-    } else if (depth == 16) {
-        RPixelShift = 15 - rpng_x_msb(RedMask);	/* these are right-shifts */
-        GPixelShift = 15 - rpng_x_msb(GreenMask);
-        BPixelShift = 15 - rpng_x_msb(BlueMask);
-    } else /* if (depth > 16) */ {
-        RPixelShift = rpng_x_msb(RedMask) - 7;	/* these are left-shifts */
-        GPixelShift = rpng_x_msb(GreenMask) - 7;
-        BPixelShift = rpng_x_msb(BlueMask) - 7;
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng_x_msb(GMask);
+        BShift = 15 - rpng_x_msb(BMask);
+    } else if (depth > 16) {
+#define NO_24BIT_MASKS
+#ifdef NO_24BIT_MASKS
+        RShift = rpng_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng_x_msb(GMask) - 7;
+        BShift = rpng_x_msb(BMask) - 7;
+#else
+        RShift = 7 - rpng_x_msb(RMask);     /* these are right-shifts, too */
+        GShift = 7 - rpng_x_msb(GMask);
+        BShift = 7 - rpng_x_msb(BMask);
+#endif
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng internal logic error:  negative X shift(s)!\n");
+        return 2;
     }
 
 /*---------------------------------------------------------------------------
@@ -423,9 +498,16 @@ static int rpng_x_create_window()
 
     attr.backing_store = Always;
     attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }
 
-    window = XCreateWindow(display, root, 0, 0, image_width, image_height,
-      0, depth, InputOutput, visual, CWBackingStore | CWEventMask, &attr);
+    window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0,
+      depth, InputOutput, visual, attrmask, &attr);
 
     if (window == None) {
         fprintf(stderr, "XCreateWindow() failed\n");
@@ -446,8 +528,8 @@ static int rpng_x_create_window()
     if ((size_hints = XAllocSizeHints()) != NULL) {
         /* window will not be resizable */
         size_hints->flags = PMinSize | PMaxSize;
-        size_hints->min_width = size_hints->max_width = image_width;
-        size_hints->min_height = size_hints->max_height = image_height;
+        size_hints->min_width = size_hints->max_width = (int)image_width;
+        size_hints->min_height = size_hints->max_height = (int)image_height;
     }
 
     if ((wm_hints = XAllocWMHints()) != NULL) {
@@ -469,13 +551,13 @@ static int rpng_x_create_window()
   ---------------------------------------------------------------------------*/
 
     if (depth == 24 || depth == 32) {
-        bg_pixel = ((ulg)bg_red   << RPixelShift) |
-                   ((ulg)bg_green << GPixelShift) |
-                   ((ulg)bg_blue  << BPixelShift);
+        bg_pixel = ((ulg)bg_red   << RShift) |
+                   ((ulg)bg_green << GShift) |
+                   ((ulg)bg_blue  << BShift);
     } else if (depth == 16) {
-        bg_pixel = ((((ulg)bg_red   << 8) >> RPixelShift) & RedMask)   |
-                   ((((ulg)bg_green << 8) >> GPixelShift) & GreenMask) |
-                   ((((ulg)bg_blue  << 8) >> BPixelShift) & BlueMask);
+        bg_pixel = ((((ulg)bg_red   << 8) >> RShift) & RMask) |
+                   ((((ulg)bg_green << 8) >> GShift) & GMask) |
+                   ((((ulg)bg_blue  << 8) >> BShift) & BMask);
     } else /* depth == 8 */ {
 
         /* GRR:  add 8-bit support */
@@ -524,7 +606,7 @@ static int rpng_x_create_window()
         return 3;
     }
 
-    /* to avoid testing the bitmap_order every pixel (or doubling the size of
+    /* to avoid testing the byte order every pixel (or doubling the size of
      * the drawing routine with a giant if-test), we arbitrarily set the byte
      * order to MSBFirst and let Xlib worry about inverting things on little-
      * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most
@@ -541,20 +623,24 @@ static int rpng_x_create_window()
 
 
 
-static int rpng_x_display_image()
+static int rpng_x_display_image(void)
 {
     uch *src;
     char *dest;
     uch r, g, b, a;
-    int ximage_rowbytes = ximage->bytes_per_line;
     ulg i, row, lastrow = 0;
     ulg pixel;
+    int ximage_rowbytes = ximage->bytes_per_line;
+/*  int bpp = ximage->bits_per_pixel;  */
 
 
     Trace((stderr, "beginning display loop (image_channels == %d)\n",
       image_channels))
-    Trace((stderr, "(width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
+    Trace((stderr, "   (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
       image_width, image_rowbytes, ximage_rowbytes))
+    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))
+    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?
+      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))
 
     if (depth == 24 || depth == 32) {
         ulg red, green, blue;
@@ -567,14 +653,27 @@ static int rpng_x_display_image()
                     red   = *src++;
                     green = *src++;
                     blue  = *src++;
-                    pixel = (red   << RPixelShift) |
-                            (green << GPixelShift) |
-                            (blue  << BPixelShift);
+#ifdef NO_24BIT_MASKS
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
                     /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[3];
-                    *dest++ = ((uch *)&pixel)[2];
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#else
+                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;
+                    green = (GShift < 0)? green << (-GShift) : green >> GShift;
+                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;
+                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#endif
                 }
             } else /* if (image_channels == 4) */ {
                 for (i = image_width;  i > 0;  --i) {
@@ -598,20 +697,20 @@ static int rpng_x_display_image()
                         alpha_composite(green, g, a, bg_green);
                         alpha_composite(blue,  b, a, bg_blue);
                     }
-                    pixel = (red   << RPixelShift) |
-                            (green << GPixelShift) |
-                            (blue  << BPixelShift);
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
                     /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[3];
-                    *dest++ = ((uch *)&pixel)[2];
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                 }
             }
             /* display after every 16 lines */
             if (((row+1) & 0xf) == 0) {
-                XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-                  image_width, 16);
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
                 XFlush(display);
                 lastrow = row + 1;
             }
@@ -631,12 +730,12 @@ static int rpng_x_display_image()
                     ++src;
                     blue  = ((ush)(*src) << 8);
                     ++src;
-                    pixel = ((red   >> RPixelShift) & RedMask)   |
-                            ((green >> GPixelShift) & GreenMask) |
-                            ((blue  >> BPixelShift) & BlueMask);
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
                     /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                 }
             } else /* if (image_channels == 4) */ {
                 for (i = image_width;  i > 0;  --i) {
@@ -663,18 +762,18 @@ static int rpng_x_display_image()
                         green = ((ush)g << 8);
                         blue  = ((ush)b << 8);
                     }
-                    pixel = ((red   >> RPixelShift) & RedMask)   |
-                            ((green >> GPixelShift) & GreenMask) |
-                            ((blue  >> BPixelShift) & BlueMask);
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
                     /* recall that we set ximage->byte_order = MSBFirst above */
-                    *dest++ = ((uch *)&pixel)[1];
-                    *dest++ = ((uch *)&pixel)[0];
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
                 }
             }
             /* display after every 16 lines */
             if (((row+1) & 0xf) == 0) {
-                XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-                  image_width, 16);
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
                 XFlush(display);
                 lastrow = row + 1;
             }
@@ -688,8 +787,8 @@ static int rpng_x_display_image()
 
     Trace((stderr, "calling final XPutImage()\n"))
     if (lastrow < image_height) {
-        XPutImage(display, window, gc, ximage, 0, lastrow, 0, lastrow,
-          image_width, image_height-lastrow);
+        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+          (int)lastrow, image_width, image_height-lastrow);
         XFlush(display);
     }
 
@@ -699,7 +798,7 @@ static int rpng_x_display_image()
 
 
 
-static void rpng_x_cleanup()
+static void rpng_x_cleanup(void)
 {
     if (image_data) {
         free(image_data);
@@ -722,6 +821,9 @@ static void rpng_x_cleanup()
 
     if (have_colormap)
         XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
 }
 
 

contrib/gregbook/rpng2-win.c

@@ -1,6 +1,6 @@
 /*---------------------------------------------------------------------------
 
-   rpng2 - progressive-model PNG display program                rpng2-win.c 
+   rpng2 - progressive-model PNG display program                rpng2-win.c
 
    This program decodes and displays PNG files progressively, as if it were
    a web browser (though the front end is only set up to read from files).
@@ -11,7 +11,6 @@
    Meulen for the "diamond" and "radial waves" patterns, respectively.
 
    to do:
-    - stdout/stderr don't work!  need message window (maybe scrollable?)
     - handle quoted command-line args (especially filenames with spaces)
     - finish resizable checkerboard-gradient (sizes 4-128?)
     - use %.1023s to simplify truncation of title-bar string?
@@ -22,10 +21,15 @@
    Changelog:
     - 1.01:  initial public release
     - 1.02:  fixed cut-and-paste error in usage screen (oops...)
+    - 1.03:  modified to allow abbreviated options
+    - 1.04:  removed bogus extra argument from usage fprintf() [Glenn R-P?];
+              fixed command-line parsing bug
+    - 1.10:  enabled "message window" (console), thanks to David Geldreich
+    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -52,15 +56,16 @@
 
 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "1.02 of 22 September 1999"
+#define VERSION   "1.20 of 29 January 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h>	/* for jmpbuf declaration in readpng2.h */
+#include <setjmp.h>    /* for jmpbuf declaration in readpng2.h */
 #include <time.h>
-#include <math.h>	/* only for PvdM background code */
+#include <math.h>      /* only for PvdM background code */
 #include <windows.h>
+#include <conio.h>     /* only for _getch() */
 
 /* all for PvdM background code: */
 #ifndef PI
@@ -80,9 +85,9 @@
 #define rgb2_max   bg_bsat
 #define rgb2_min   bg_brot
 
-/* #define DEBUG */	/* this enables the Trace() macros */
+/* #define DEBUG */     /* this enables the Trace() macros */
 
-#include "readpng2.h"	/* typedefs, common macros, readpng2 prototypes */
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */
 
 
 /* could just include png.h, but this macro is the only thing we need
@@ -90,18 +95,18 @@
  * only happen with alpha (which could easily be avoided with
  * "ush acopy = (alpha);") */
 
-#define alpha_composite(composite, fg, alpha, bg) {			\
-    ush temp = ((ush)(fg)*(ush)(alpha) +				\
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);	\
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);			\
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }
 
 
-#define INBUFSIZE 4096	/* with pseudo-timing on (1 sec delay/block), this
-			 *  block size corresponds roughly to a download
-			 *  speed 10% faster than theoretical 33.6K maximum
-			 *  (assuming 8 data bits, 1 stop bit and no other
-			 *  overhead) */
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */
 
 /* local prototypes */
 static void       rpng2_win_init(void);
@@ -116,7 +121,7 @@ LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 static char titlebar[1024], *window_name = titlebar;
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;	/* GRR:  not (yet) used */
+static char *icon_name = PROGNAME;    /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
 
@@ -125,7 +130,7 @@ static mainprog_info rpng2_info;
 static uch inbuf[INBUFSIZE];
 static int incount;
 
-static int pat = 6;		/* must be less than num_bgpat */
+static int pat = 6;         /* must be less than num_bgpat */
 static int bg_image = 0;
 static int bgscale = 16;
 static ulg bg_rowbytes;
@@ -134,22 +139,22 @@ static uch *bg_data;
 static struct rgb_color {
     uch r, g, b;
 } rgb[] = {
-    {  0,   0,   0},	/*  0:  black */
-    {255, 255, 255},	/*  1:  white */
-    {173, 132,  57},	/*  2:  tan */
-    { 64, 132,   0},	/*  3:  medium green */
-    {189, 117,   1},	/*  4:  gold */
-    {253, 249,   1},	/*  5:  yellow */
-    {  0,   0, 255},	/*  6:  blue */
-    {  0,   0, 120},	/*  7:  medium blue */
-    {255,   0, 255},	/*  8:  magenta */
-    { 64,   0,  64},	/*  9:  dark magenta */
-    {255,   0,   0},	/* 10:  red */
-    { 64,   0,   0},	/* 11:  dark red */
-    {255, 127,   0},	/* 12:  orange */
-    {192,  96,   0},	/* 13:  darker orange */
-    { 24,  60,   0},	/* 14:  dark green-yellow */
-    { 85, 125, 200} 	/* 15:  ice blue */
+    {  0,   0,   0},    /*  0:  black */
+    {255, 255, 255},    /*  1:  white */
+    {173, 132,  57},    /*  2:  tan */
+    { 64, 132,   0},    /*  3:  medium green */
+    {189, 117,   1},    /*  4:  gold */
+    {253, 249,   1},    /*  5:  yellow */
+    {  0,   0, 255},    /*  6:  blue */
+    {  0,   0, 120},    /*  7:  medium blue */
+    {255,   0, 255},    /*  8:  magenta */
+    { 64,   0,  64},    /*  9:  dark magenta */
+    {255,   0,   0},    /* 10:  red */
+    { 64,   0,   0},    /* 11:  dark red */
+    {255, 127,   0},    /* 12:  orange */
+    {192,  96,   0},    /* 13:  darker orange */
+    { 24,  60,   0},    /* 14:  dark green-yellow */
+    { 85, 125, 200}     /* 15:  ice blue */
 };
 /* not used for now, but should be for error-checking:
 static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
@@ -174,21 +179,21 @@ static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
  */
 static struct background_pattern {
     ush type;
-    int rgb1_max, rgb1_min;	/* or bg_freq, bg_gray */
-    int rgb2_max, rgb2_min;	/* or bg_bsat, bg_brot (both scaled by 10)*/
+    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */
+    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/
 } bg[] = {
-    {0+8,   2,0,  1,15},  	/* checkered:  tan/black vs. white/ice blue */
-    {0+24,  2,0,  1,0},  	/* checkered:  tan/black vs. white/black */
-    {0+8,   4,5,  0,2},  	/* checkered:  gold/yellow vs. black/tan */
-    {0+8,   4,5,  0,6},  	/* checkered:  gold/yellow vs. black/blue */
-    {0,     7,0,  8,9},  	/* checkered:  deep blue/black vs. magenta */
-    {0+8,  13,0,  5,14},  	/* checkered:  orange/black vs. yellow */
-    {0+8,  12,0, 10,11},  	/* checkered:  orange/black vs. red */
-    {1,     7,0,  8,0},  	/* diamonds:  deep blue/black vs. magenta */
-    {1,    12,0, 11,0},  	/* diamonds:  orange vs. dark red */
-    {1,    10,0,  7,0},  	/* diamonds:  red vs. medium blue */
-    {1,     4,0,  5,0},  	/* diamonds:  gold vs. yellow */
-    {1,     3,0,  0,0},  	/* diamonds:  medium green vs. black */
+    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */
+    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */
+    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */
+    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */
+    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */
+    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */
+    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */
+    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */
+    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */
+    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */
+    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */
+    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */
     {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
     {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
     {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
@@ -212,16 +217,17 @@ static int global_showmode;
 
 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
 {
-    char *args[1024];		/* arbitrary limit, but should suffice */
-    char *p, *q, *bgstr = NULL, **argv = args;
+    char *args[1024];                 /* arbitrary limit, but should suffice */
+    char **argv = args;
+    char *p, *q, *bgstr = NULL;
     int argc = 0;
     int rc, alen, flen;
     int error = 0;
     int timing = FALSE;
     int have_bg = FALSE;
-    double LUT_exponent;		/* just the lookup table */
-    double CRT_exponent = 2.2;		/* just the monitor */
-    double default_display_exponent;	/* whole display system */
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
     MSG msg;
 
 
@@ -235,6 +241,16 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     memset(&rpng2_info, 0, sizeof(mainprog_info));
 
 
+    /* Next reenable console output, which normally goes to the bit bucket
+     * for windowed apps.  Closing the console window will terminate the
+     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
+     * incantation. */
+
+    AllocConsole();
+    freopen("CONOUT$", "a", stderr);
+    freopen("CONOUT$", "a", stdout);
+
+
     /* Set the default value for our display-system exponent, i.e., the
      * product of the CRT exponent and the exponent corresponding to
      * the frame-buffer's lookup table (LUT), if any.  This is not an
@@ -267,7 +283,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     LUT_exponent = 1.8 / 2.61;
     /*
     if (some_mac_function_that_returns_gamma(&mac_gamma))
-        LUT_exponent = mac_gamma / 2.61;                 
+        LUT_exponent = mac_gamma / 2.61;
      */
 #else
     LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
@@ -316,34 +332,52 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     /* Now parse the command line for options and the PNG filename. */
 
     while (*++argv && !error) {
-        if (!strcmp(*argv, "-gamma")) {
+        if (!strncmp(*argv, "-gamma", 2)) {
             if (!*++argv)
                 ++error;
-            rpng2_info.display_exponent = atof(*argv);
-            if (rpng2_info.display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
             else {
-                have_bg = TRUE;
-                bg_image = FALSE;
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
             }
-        } else if (!strcmp(*argv, "-bgpat")) {
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
             if (!*++argv)
                 ++error;
-            pat = atoi(*argv) - 1;
-            if (pat < 0 || pat >= num_bgpat)
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
                 ++error;
             else {
-                bg_image = TRUE;
-                have_bg = FALSE;
+                pat = atoi(*argv) - 1;
+                if (pat < 0 || pat >= num_bgpat)
+                    ++error;
+                else {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                }
             }
-        } else if (!strcmp(*argv, "-timing")) {
+        } else if (!strncmp(*argv, "-timing", 2)) {
             timing = TRUE;
+#if (defined(__i386__) || defined(_M_IX86))
+        } else if (!strncmp(*argv, "-nommxfilters", 7)) {
+            rpng2_info.nommxfilters = TRUE;
+        } else if (!strncmp(*argv, "-nommxcombine", 7)) {
+            rpng2_info.nommxcombine = TRUE;
+        } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
+            rpng2_info.nommxinterlace = TRUE;
+        } else if (!strcmp(*argv, "-nommx")) {
+            rpng2_info.nommxfilters = TRUE;
+            rpng2_info.nommxcombine = TRUE;
+            rpng2_info.nommxinterlace = TRUE;
+#endif
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -387,26 +421,51 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
             fclose(infile);
     }
 
+
+    /* usage screen */
+
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        int ch;
+
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
         readpng2_version_info();
         fprintf(stderr, "\n"
-          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]"
-          " file.png\n\n"
+          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
+#if (defined(__i386__) || defined(_M_IX86))
+          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
+#endif
+          "        %*s file.png\n\n"
           "    exp \ttransfer-function exponent (``gamma'') of the display\n"
           "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
           "\t\t  to the product of the lookup-table exponent (varies)\n"
           "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
           "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
-          "\t\t  used with transparent images; overrides -bgpat\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images; overrides -bgpat option\n"
           "    pat \tdesired background pattern number (1-%d); used with\n"
-          "\t\t  transparent images; overrides -bgcolor\n"
+          "\t\t  transparent images; overrides -bgcolor option\n"
           "    -timing\tenables delay for every block read, to simulate modem\n"
           "\t\t  download of image (~36 Kbps)\n"
+#if (defined(__i386__) || defined(_M_IX86))
+          "    -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
+          "\t\t  combining rows, and expanding interlacing, respectively\n"
+#endif
           "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-          "\n", PROGNAME, " ", default_display_exponent, num_bgpat);
+          "Press Q or Esc to quit this usage screen.\n"
+          "\n", PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86))
+          strlen(PROGNAME), " ",
+#endif
+          strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
         exit(1);
+    } else {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        fprintf(stderr,
+          "\n   [console window:  closing this window will terminate %s]\n\n",
+          PROGNAME);
     }
 
 
@@ -560,7 +619,7 @@ static int rpng2_win_create_window()
     if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
                               wimage_rowbytes*rpng2_info.height)))
     {
-        return 4;	/* fail */
+        return 4;   /* fail */
     }
 
 /*---------------------------------------------------------------------------
@@ -655,7 +714,7 @@ static int rpng2_win_create_window()
         TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
         ReleaseDC(global_hwnd, hdc);
 
-        rpng2_win_load_bg_image();	/* resets bg_image if fails */
+        rpng2_win_load_bg_image();   /* resets bg_image if fails */
     }
 
     if (!bg_image) {
@@ -753,7 +812,7 @@ static int rpng2_win_load_bg_image()
                 even_odd = even_odd_vert ^ even_odd_horiz;
                 invert_column =
                   (even_odd_horiz && (bg[pat].type & 0x10));
-                if (even_odd == 0) {		/* gradient #1 */
+                if (even_odd == 0) {         /* gradient #1 */
                     if (invert_column) {
                         *dest++ = r1_inv;
                         *dest++ = g1_inv;
@@ -763,16 +822,16 @@ static int rpng2_win_load_bg_image()
                         *dest++ = g1;
                         *dest++ = b1;
                     }
-                } else {			/* gradient #2 */
+                } else {                     /* gradient #2 */
                     if ((invert_column && invert_gradient2) ||
                         (!invert_column && !invert_gradient2))
                     {
-                        *dest++ = r2;      /* not inverted or */
-                        *dest++ = g2;      /*  doubly inverted */
+                        *dest++ = r2;        /* not inverted or */
+                        *dest++ = g2;        /*  doubly inverted */
                         *dest++ = b2;
                     } else {
                         *dest++ = r2_inv;
-                        *dest++ = g2_inv;  /* singly inverted */
+                        *dest++ = g2_inv;    /* singly inverted */
                         *dest++ = b2_inv;
                     }
                 }
@@ -786,8 +845,8 @@ static int rpng2_win_load_bg_image()
 
     } else if ((bg[pat].type & 0x07) == 1) {
 
-        hmax = (bgscale-1)/2;	/* half the max weight of a color */
-        max = 2*hmax;		/* the max weight of a color */
+        hmax = (bgscale-1)/2;   /* half the max weight of a color */
+        max = 2*hmax;           /* the max weight of a color */
 
         r1 = rgb[bg[pat].rgb1_max].r;
         g1 = rgb[bg[pat].rgb1_max].g;
@@ -908,7 +967,7 @@ static int rpng2_win_load_bg_image()
             g1 = *src++;
             b1 = *src++;
             *dest++ = b1;
-            *dest++ = g1;	/* note reverse order */
+            *dest++ = g1;   /* note reverse order */
             *dest++ = r1;
         }
     }
@@ -962,7 +1021,7 @@ static void rpng2_win_display_row(ulg row)
             g = *src++;
             b = *src++;
             *dest++ = b;
-            *dest++ = g;	/* note reverse order */
+            *dest++ = g;   /* note reverse order */
             *dest++ = r;
         }
     } else /* if (rpng2_info.channels == 4) */ {
@@ -1028,7 +1087,9 @@ static void rpng2_win_finish_display()
      * that the image is done */
 
     rpng2_info.done = TRUE;
-    printf("Done.  Press Q, Esc or mouse button 1 to quit.\n");
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
 }
 
 
@@ -1084,15 +1145,15 @@ LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
 
         /* wait for the user to tell us when to quit */
         case WM_CHAR:
-            switch (wP) {	/* only need one, so ignore repeat count */
+            switch (wP) {       /* only need one, so ignore repeat count */
                 case 'q':
                 case 'Q':
-                case 0x1B:	/* Esc key */
+                case 0x1B:      /* Esc key */
                     PostQuitMessage(0);
             }
             return 0;
 
-        case WM_LBUTTONDOWN:	/* another way of quitting */
+        case WM_LBUTTONDOWN:    /* another way of quitting */
         case WM_DESTROY:
             PostQuitMessage(0);
             return 0;

contrib/gregbook/rpng2-x.c

@@ -1,14 +1,16 @@
 /*---------------------------------------------------------------------------
 
-   rpng2 - progressive-model PNG display program                  rpng2-x.c 
+   rpng2 - progressive-model PNG display program                  rpng2-x.c
 
    This program decodes and displays PNG files progressively, as if it were
    a web browser (though the front end is only set up to read from files).
    It supports gamma correction, user-specified background colors, and user-
    specified background patterns (for transparent images).  This version is
-   for the X Window System (tested under Unix, but may work under VMS or OS/2
-   with a little tweaking).  Thanks to Adam Costello and Pieter S. van der
-   Meulen for the "diamond" and "radial waves" patterns, respectively.
+   for the X Window System (tested by the author under Unix and by Martin
+   Zinser under OpenVMS; may work under OS/2 with a little tweaking).
+
+   Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"
+   and "radial waves" patterns, respectively.
 
    to do:
     - 8-bit support
@@ -17,7 +19,17 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed char/uchar mismatch
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added -usleep option for demos; fixed command-line parsing bug
+    - 1.12:  added -pause option for demos and testing
+    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -44,21 +56,21 @@
 
 #define PROGNAME  "rpng2-x"
 #define LONGNAME  "Progressive PNG Viewer for X"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.20 of 29 January 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h>	/* for jmpbuf declaration in readpng2.h */
+#include <setjmp.h>       /* for jmpbuf declaration in readpng2.h */
 #include <time.h>
-#include <math.h>	/* only for PvdM background code */
+#include <math.h>         /* only for PvdM background code */
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>
-#include <X11/keysym.h>	/* defines XK_* macros */
+#include <X11/keysym.h>   /* defines XK_* macros */
 
 #ifdef VMS
-#include <unistd.h>
+#  include <unistd.h>
 #endif
 
 /* all for PvdM background code: */
@@ -79,9 +91,9 @@
 #define rgb2_max   bg_bsat
 #define rgb2_min   bg_brot
 
-/* #define DEBUG */	/* this enables the Trace() macros */
+/* #define DEBUG */     /* this enables the Trace() macros */
 
-#include "readpng2.h"	/* typedefs, common macros, readpng2 prototypes */
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */
 
 
 /* could just include png.h, but this macro is the only thing we need
@@ -89,18 +101,18 @@
  * only happen with alpha (which could easily be avoided with
  * "ush acopy = (alpha);") */
 
-#define alpha_composite(composite, fg, alpha, bg) {			\
-    ush temp = ((ush)(fg)*(ush)(alpha) +				\
-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);	\
-    (composite) = (uch)((temp + (temp >> 8)) >> 8);			\
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
 }
 
 
-#define INBUFSIZE 4096	/* with pseudo-timing on (1 sec delay/block), this
-			 *  block size corresponds roughly to a download
-			 *  speed 10% faster than theoretical 33.6K maximum
-			 *  (assuming 8 data bits, 1 stop bit and no other
-			 *  overhead) */
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */
 
 /* local prototypes */
 static void rpng2_x_init(void);
@@ -123,31 +135,35 @@ static mainprog_info rpng2_info;
 static uch inbuf[INBUFSIZE];
 static int incount;
 
-static int pat = 6;		/* must be less than num_bgpat */
+static int pat = 6;        /* must be less than num_bgpat */
 static int bg_image = 0;
 static int bgscale = 16;
 static ulg bg_rowbytes;
 static uch *bg_data;
 
+int pause_after_pass = FALSE;
+int demo_timing = FALSE;
+ulg usleep_duration = 0L;
+
 static struct rgb_color {
     uch r, g, b;
 } rgb[] = {
-    {  0,   0,   0},	/*  0:  black */
-    {255, 255, 255},	/*  1:  white */
-    {173, 132,  57},	/*  2:  tan */
-    { 64, 132,   0},	/*  3:  medium green */
-    {189, 117,   1},	/*  4:  gold */
-    {253, 249,   1},	/*  5:  yellow */
-    {  0,   0, 255},	/*  6:  blue */
-    {  0,   0, 120},	/*  7:  medium blue */
-    {255,   0, 255},	/*  8:  magenta */
-    { 64,   0,  64},	/*  9:  dark magenta */
-    {255,   0,   0},	/* 10:  red */
-    { 64,   0,   0},	/* 11:  dark red */
-    {255, 127,   0},	/* 12:  orange */
-    {192,  96,   0},	/* 13:  darker orange */
-    { 24,  60,   0},	/* 14:  dark green-yellow */
-    { 85, 125, 200} 	/* 15:  ice blue */
+    {  0,   0,   0},    /*  0:  black */
+    {255, 255, 255},    /*  1:  white */
+    {173, 132,  57},    /*  2:  tan */
+    { 64, 132,   0},    /*  3:  medium green */
+    {189, 117,   1},    /*  4:  gold */
+    {253, 249,   1},    /*  5:  yellow */
+    {  0,   0, 255},    /*  6:  blue */
+    {  0,   0, 120},    /*  7:  medium blue */
+    {255,   0, 255},    /*  8:  magenta */
+    { 64,   0,  64},    /*  9:  dark magenta */
+    {255,   0,   0},    /* 10:  red */
+    { 64,   0,   0},    /* 11:  dark red */
+    {255, 127,   0},    /* 12:  orange */
+    {192,  96,   0},    /* 13:  darker orange */
+    { 24,  60,   0},    /* 14:  dark green-yellow */
+    { 85, 125, 200}     /* 15:  ice blue */
 };
 /* not used for now, but should be for error-checking:
 static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
@@ -172,21 +188,21 @@ static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
  */
 static struct background_pattern {
     ush type;
-    int rgb1_max, rgb1_min;	/* or bg_freq, bg_gray */
-    int rgb2_max, rgb2_min;	/* or bg_bsat, bg_brot (both scaled by 10)*/
+    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */
+    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/
 } bg[] = {
-    {0+8,   2,0,  1,15},  	/* checkered:  tan/black vs. white/ice blue */
-    {0+24,  2,0,  1,0},  	/* checkered:  tan/black vs. white/black */
-    {0+8,   4,5,  0,2},  	/* checkered:  gold/yellow vs. black/tan */
-    {0+8,   4,5,  0,6},  	/* checkered:  gold/yellow vs. black/blue */
-    {0,     7,0,  8,9},  	/* checkered:  deep blue/black vs. magenta */
-    {0+8,  13,0,  5,14},  	/* checkered:  orange/black vs. yellow */
-    {0+8,  12,0, 10,11},  	/* checkered:  orange/black vs. red */
-    {1,     7,0,  8,0},  	/* diamonds:  deep blue/black vs. magenta */
-    {1,    12,0, 11,0},  	/* diamonds:  orange vs. dark red */
-    {1,    10,0,  7,0},  	/* diamonds:  red vs. medium blue */
-    {1,     4,0,  5,0},  	/* diamonds:  gold vs. yellow */
-    {1,     3,0,  0,0},  	/* diamonds:  medium green vs. black */
+    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */
+    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */
+    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */
+    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */
+    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */
+    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */
+    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */
+    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */
+    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */
+    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */
+    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */
+    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */
     {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
     {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
     {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
@@ -201,12 +217,14 @@ static XImage *ximage;
 static Display *display;
 static int depth;
 static Visual *visual;
-static int RPixelShift, GPixelShift, BPixelShift;
-static ulg RedMask, GreenMask, BlueMask;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
 static Window window;
 static GC gc;
 static Colormap colormap;
 
+static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;
 
@@ -294,38 +312,66 @@ int main(int argc, char **argv)
     /* Now parse the command line for options and the PNG filename. */
 
     while (*++argv && !error) {
-        if (!strcmp(*argv, "-display")) {
+        if (!strncmp(*argv, "-display", 2)) {
             if (!*++argv)
                 ++error;
-            displayname = *argv;
-        } else if (!strcmp(*argv, "-gamma")) {
+            else
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
             if (!*++argv)
                 ++error;
-            rpng2_info.display_exponent = atof(*argv);
-            if (rpng2_info.display_exponent <= 0.0)
-                ++error;
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
             else {
-                have_bg = TRUE;
-                bg_image = FALSE;
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
             }
-        } else if (!strcmp(*argv, "-bgpat")) {
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
             if (!*++argv)
                 ++error;
-            pat = atoi(*argv) - 1;
-            if (pat < 0 || pat >= num_bgpat)
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
                 ++error;
             else {
-                bg_image = TRUE;
-                have_bg = FALSE;
+                pat = atoi(*argv) - 1;
+                if (pat < 0 || pat >= num_bgpat)
+                    ++error;
+                else {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                }
             }
-        } else if (!strcmp(*argv, "-timing")) {
+        } else if (!strncmp(*argv, "-usleep", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                usleep_duration = (ulg)atol(*argv);
+                demo_timing = TRUE;
+            }
+        } else if (!strncmp(*argv, "-pause", 2)) {
+            pause_after_pass = TRUE;
+        } else if (!strncmp(*argv, "-timing", 2)) {
             timing = TRUE;
+#if (defined(__i386__) || defined(_M_IX86))
+        } else if (!strncmp(*argv, "-nommxfilters", 7)) {
+            rpng2_info.nommxfilters = TRUE;
+        } else if (!strncmp(*argv, "-nommxcombine", 7)) {
+            rpng2_info.nommxcombine = TRUE;
+        } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
+            rpng2_info.nommxinterlace = TRUE;
+        } else if (!strcmp(*argv, "-nommx")) {
+            rpng2_info.nommxfilters = TRUE;
+            rpng2_info.nommxcombine = TRUE;
+            rpng2_info.nommxinterlace = TRUE;
+#endif
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -377,27 +423,44 @@ int main(int argc, char **argv)
             fclose(infile);
     }
 
+
+    /* usage screen */
+
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
         readpng2_version_info();
         fprintf(stderr, "\n"
           "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"
-          "        %*s [-timing] file.png\n\n"
+#if (defined(__i386__) || defined(_M_IX86))
+          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
+#endif
+          "        %*s [-usleep dur | -timing] [-pause] file.png\n\n"
           "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
           "    exp \ttransfer-function exponent (``gamma'') of the display\n"
           "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
           "\t\t  to the product of the lookup-table exponent (varies)\n"
           "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
           "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7f00'' for orange:  same as HTML colors);\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
           "\t\t  used with transparent images; overrides -bgpat\n"
           "    pat \tdesired background pattern number (1-%d); used with\n"
           "\t\t  transparent images; overrides -bgcolor\n"
+#if (defined(__i386__) || defined(_M_IX86))
+          "    -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
+          "\t\t  combining rows, and expanding interlacing, respectively\n"
+#endif
+          "    dur \tduration in microseconds to wait after displaying each\n"
+          "\t\t  row (for demo purposes)\n"
           "    -timing\tenables delay for every block read, to simulate modem\n"
           "\t\t  download of image (~36 Kbps)\n"
-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-          "\n", PROGNAME, strlen(PROGNAME), " ", default_display_exponent,
-          num_bgpat);
+          "    -pause\tpauses after displaying each pass until key pressed\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86))
+          strlen(PROGNAME), " ",
+#endif
+          strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
         exit(1);
     }
 
@@ -489,7 +552,7 @@ int main(int argc, char **argv)
  * in turn is called by libpng after all of the pre-IDAT chunks have been
  * read and processed--i.e., we now have enough info to finish initializing */
 
-static void rpng2_x_init()
+static void rpng2_x_init(void)
 {
     ulg i;
     ulg rowbytes = rpng2_info.rowbytes;
@@ -531,12 +594,14 @@ static void rpng2_x_init()
 
 
 
-static int rpng2_x_create_window()
+static int rpng2_x_create_window(void)
 {
     ulg bg_red   = rpng2_info.bg_red;
     ulg bg_green = rpng2_info.bg_green;
     ulg bg_blue  = rpng2_info.bg_blue;
     ulg bg_pixel = 0L;
+    ulg attrmask;
+    int need_colormap = FALSE;
     int screen, pad;
     uch *xdata;
     Window root;
@@ -556,39 +621,70 @@ static int rpng2_x_create_window()
     depth = DisplayPlanes(display, screen);
     root = RootWindow(display, screen);
 
-/* GRR:  add 8-bit support */
-    if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
-        fprintf(stderr,
-          "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n",
-          depth);
-        return 2;
+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;
+
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
     }
 
-    XMatchVisualInfo(display, screen, depth,
-      (depth == 8)? PseudoColor : TrueColor, &visual_info);
-    visual = visual_info.visual;
-
-    RedMask   = visual->red_mask;
-    GreenMask = visual->green_mask;
-    BlueMask  = visual->blue_mask;
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;
 
 /* GRR:  add/check 8-bit support */
-    if (depth == 8) {
+    if (depth == 8 || need_colormap) {
         colormap = XCreateColormap(display, root, visual, AllocNone);
         if (!colormap) {
             fprintf(stderr, "XCreateColormap() failed\n");
             return 2;
         }
         have_colormap = TRUE;
-        bg_image = FALSE;	/* gradient just wastes palette entries */
-    } else if (depth == 16) {
-        RPixelShift = 15 - rpng2_x_msb(RedMask);   /* these are right-shifts */
-        GPixelShift = 15 - rpng2_x_msb(GreenMask);
-        BPixelShift = 15 - rpng2_x_msb(BlueMask);
-    } else /* if (depth > 16) */ {
-        RPixelShift = rpng2_x_msb(RedMask) - 7;    /* these are left-shifts */
-        GPixelShift = rpng2_x_msb(GreenMask) - 7;
-        BPixelShift = rpng2_x_msb(BlueMask) - 7;
+        if (depth == 8)
+            bg_image = FALSE;   /* gradient just wastes palette entries */
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng2_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng2_x_msb(GMask);
+        BShift = 15 - rpng2_x_msb(BMask);
+    } else if (depth > 16) {
+        RShift = rpng2_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng2_x_msb(GMask) - 7;
+        BShift = rpng2_x_msb(BMask) - 7;
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng2 internal logic error:  negative X shift(s)!\n");
+        return 2;
     }
 
 /*---------------------------------------------------------------------------
@@ -597,10 +693,16 @@ static int rpng2_x_create_window()
 
     attr.backing_store = Always;
     attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }
 
     window = XCreateWindow(display, root, 0, 0, rpng2_info.width,
-      rpng2_info.height, 0, depth, InputOutput, visual,
-      CWBackingStore | CWEventMask, &attr);
+      rpng2_info.height, 0, depth, InputOutput, visual, attrmask, &attr);
 
     if (window == None) {
         fprintf(stderr, "XCreateWindow() failed\n");
@@ -621,8 +723,9 @@ static int rpng2_x_create_window()
     if ((size_hints = XAllocSizeHints()) != NULL) {
         /* window will not be resizable */
         size_hints->flags = PMinSize | PMaxSize;
-        size_hints->min_width = size_hints->max_width = rpng2_info.width;
-        size_hints->min_height = size_hints->max_height = rpng2_info.height;
+        size_hints->min_width = size_hints->max_width = (int)rpng2_info.width;
+        size_hints->min_height = size_hints->max_height =
+          (int)rpng2_info.height;
     }
 
     if ((wm_hints = XAllocWMHints()) != NULL) {
@@ -668,7 +771,7 @@ static int rpng2_x_create_window()
         return 3;
     }
 
-    /* to avoid testing the bitmap order every pixel (or doubling the size of
+    /* to avoid testing the byte order every pixel (or doubling the size of
      * the drawing routine with a giant if-test), we arbitrarily set the byte
      * order to MSBFirst and let Xlib worry about inverting things on little-
      * endian machines (e.g., Linux/x86, old VAXen, etc.)--this is not the
@@ -684,17 +787,17 @@ static int rpng2_x_create_window()
   ---------------------------------------------------------------------------*/
 
     if (bg_image)
-        rpng2_x_load_bg_image();	/* resets bg_image if fails */
+        rpng2_x_load_bg_image();    /* resets bg_image if fails */
 
     if (!bg_image) {
         if (depth == 24 || depth == 32) {
-            bg_pixel = (bg_red   << RPixelShift) |
-                       (bg_green << GPixelShift) |
-                       (bg_blue  << BPixelShift);
+            bg_pixel = (bg_red   << RShift) |
+                       (bg_green << GShift) |
+                       (bg_blue  << BShift);
         } else if (depth == 16) {
-            bg_pixel = (((bg_red   << 8) >> RPixelShift) & RedMask)   |
-                       (((bg_green << 8) >> GPixelShift) & GreenMask) |
-                       (((bg_blue  << 8) >> BPixelShift) & BlueMask);
+            bg_pixel = (((bg_red   << 8) >> RShift) & RMask) |
+                       (((bg_green << 8) >> GShift) & GMask) |
+                       (((bg_blue  << 8) >> BShift) & BMask);
         } else /* depth == 8 */ {
 
             /* GRR:  add 8-bit support */
@@ -723,7 +826,7 @@ static int rpng2_x_create_window()
 
 
 
-static int rpng2_x_load_bg_image()
+static int rpng2_x_load_bg_image(void)
 {
     uch *src;
     char *dest;
@@ -772,8 +875,8 @@ static int rpng2_x_load_bg_image()
         int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
 
         for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
-            even_odd_vert = (row / bgscale) & 1;
+            yidx = (int)(row % bgscale);
+            even_odd_vert = (int)((row / bgscale) & 1);
 
             r1 = r1_min + (r1_diff * yidx) / yidx_max;
             g1 = g1_min + (g1_diff * yidx) / yidx_max;
@@ -789,13 +892,13 @@ static int rpng2_x_load_bg_image()
             g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
             b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
 
-            dest = (char *)(bg_data + row*bg_rowbytes);
+            dest = (char *)bg_data + row*bg_rowbytes;
             for (i = 0;  i < rpng2_info.width;  ++i) {
-                even_odd_horiz = (i / bgscale) & 1;
+                even_odd_horiz = (int)((i / bgscale) & 1);
                 even_odd = even_odd_vert ^ even_odd_horiz;
                 invert_column =
                   (even_odd_horiz && (bg[pat].type & 0x10));
-                if (even_odd == 0) {		/* gradient #1 */
+                if (even_odd == 0) {        /* gradient #1 */
                     if (invert_column) {
                         *dest++ = r1_inv;
                         *dest++ = g1_inv;
@@ -805,16 +908,16 @@ static int rpng2_x_load_bg_image()
                         *dest++ = g1;
                         *dest++ = b1;
                     }
-                } else {			/* gradient #2 */
+                } else {                    /* gradient #2 */
                     if ((invert_column && invert_gradient2) ||
                         (!invert_column && !invert_gradient2))
                     {
-                        *dest++ = r2;      /* not inverted or */
-                        *dest++ = g2;      /*  doubly inverted */
+                        *dest++ = r2;       /* not inverted or */
+                        *dest++ = g2;       /*  doubly inverted */
                         *dest++ = b2;
                     } else {
                         *dest++ = r2_inv;
-                        *dest++ = g2_inv;  /* singly inverted */
+                        *dest++ = g2_inv;   /* singly inverted */
                         *dest++ = b2_inv;
                     }
                 }
@@ -828,8 +931,8 @@ static int rpng2_x_load_bg_image()
 
     } else if ((bg[pat].type & 0x07) == 1) {
 
-        hmax = (bgscale-1)/2;	/* half the max weight of a color */
-        max = 2*hmax;		/* the max weight of a color */
+        hmax = (bgscale-1)/2;   /* half the max weight of a color */
+        max = 2*hmax;           /* the max weight of a color */
 
         r1 = rgb[bg[pat].rgb1_max].r;
         g1 = rgb[bg[pat].rgb1_max].g;
@@ -839,12 +942,12 @@ static int rpng2_x_load_bg_image()
         b2 = rgb[bg[pat].rgb2_max].b;
 
         for (row = 0;  row < rpng2_info.height;  ++row) {
-            yidx = row % bgscale;
+            yidx = (int)(row % bgscale);
             if (yidx > hmax)
                 yidx = bgscale-1 - yidx;
-            dest = (char *)(bg_data + row*bg_rowbytes);
+            dest = (char *)bg_data + row*bg_rowbytes;
             for (i = 0;  i < rpng2_info.width;  ++i) {
-                xidx = i % bgscale;
+                xidx = (int)(i % bgscale);
                 if (xidx > hmax)
                     xidx = bgscale-1 - xidx;
                 k = xidx + yidx;
@@ -871,8 +974,8 @@ static int rpng2_x_load_bg_image()
           PROGNAME);
         fflush(stderr);
 
-        hh = rpng2_info.height / 2;
-        hw = rpng2_info.width / 2;
+        hh = (int)(rpng2_info.height / 2);
+        hw = (int)(rpng2_info.width / 2);
 
         /* variables for radial waves:
          *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
@@ -891,10 +994,10 @@ static int rpng2_x_load_bg_image()
         maxDist = (double)((hw*hw) + (hh*hh));
 
         for (row = 0;  row < rpng2_info.height;  ++row) {
-            y = row - hh;
-            dest = (char *)(bg_data + row*bg_rowbytes);
+            y = (int)(row - hh);
+            dest = (char *)bg_data + row*bg_rowbytes;
             for (i = 0;  i < rpng2_info.width;  ++i) {
-                x = i - hw;
+                x = (int)(i - hw);
                 angle = (x == 0)? PI_2 : atan((double)y / (double)x);
                 gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
                 gray = MIN(1.0, gray);
@@ -951,14 +1054,15 @@ static int rpng2_x_load_bg_image()
                 red   = *src++;
                 green = *src++;
                 blue  = *src++;
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
                 /* recall that we set ximage->byte_order = MSBFirst above */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         }
 
@@ -969,18 +1073,15 @@ static int rpng2_x_load_bg_image()
             src = bg_data + row*bg_rowbytes;
             dest = ximage->data + row*ximage_rowbytes;
             for (i = rpng2_info.width;  i > 0;  --i) {
-                red   = ((ush)(*src) << 8);
-                ++src;
-                green = ((ush)(*src) << 8);
-                ++src;
-                blue  = ((ush)(*src) << 8);
-                ++src;
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
+                red   = ((ush)(*src) << 8);  ++src;
+                green = ((ush)(*src) << 8);  ++src;
+                blue  = ((ush)(*src) << 8);  ++src;
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
                 /* recall that we set ximage->byte_order = MSBFirst above */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         }
 
@@ -1011,7 +1112,7 @@ static void rpng2_x_display_row(ulg row)
     uch r, g, b, a;
     int ximage_rowbytes = ximage->bytes_per_line;
     ulg i, pixel;
-    static int rows=0;
+    static int rows=0, prevpass=(-1);
     static ulg firstrow;
 
 /*---------------------------------------------------------------------------
@@ -1022,8 +1123,28 @@ static void rpng2_x_display_row(ulg row)
 
     Trace((stderr, "beginning rpng2_x_display_row()\n"))
 
+    if (rpng2_info.pass != prevpass) {
+        if (pause_after_pass && rpng2_info.pass > 0) {
+            XEvent e;
+            KeySym k;
+
+            fprintf(stderr,
+              "%s:  end of pass %d of 7; click in image window to continue\n",
+              PROGNAME, prevpass + 1);
+            do
+                XNextEvent(display, &e);
+            while (!(e.type == ButtonPress && e.xbutton.button == Button1)
+                   && !(e.type == KeyPress &&
+                   ((k = XLookupKeysym(&e.xkey, 0)) == XK_q
+                    || k == XK_Escape) )) ;
+        }
+        fprintf(stderr, "%s:  pass %d of 7\r", PROGNAME, rpng2_info.pass + 1);
+        fflush(stderr);
+        prevpass = rpng2_info.pass;
+    }
+
     if (rows == 0)
-        firstrow = row;   /* first row not yet displayed */
+        firstrow = row;   /* first row that is not yet displayed */
 
     ++rows;   /* count of rows received but not yet displayed */
 
@@ -1046,14 +1167,15 @@ static void rpng2_x_display_row(ulg row)
                 red   = *src++;
                 green = *src++;
                 blue  = *src++;
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         } else /* if (rpng2_info.channels == 4) */ {
             for (i = rpng2_info.width;  i > 0;  --i) {
@@ -1082,14 +1204,15 @@ static void rpng2_x_display_row(ulg row)
                     alpha_composite(green, g, a, bg_green);
                     alpha_composite(blue,  b, a, bg_blue);
                 }
-                pixel = (red   << RPixelShift) |
-                        (green << GPixelShift) |
-                        (blue  << BPixelShift);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[3];
-                *dest++ = ((uch *)&pixel)[2];
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                *dest++ = (char)((pixel >> 24) & 0xff);
+                *dest++ = (char)((pixel >> 16) & 0xff);
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         }
 
@@ -1108,12 +1231,12 @@ static void rpng2_x_display_row(ulg row)
                 ++src;
                 blue  = ((ush)(*src) << 8);
                 ++src;
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         } else /* if (rpng2_info.channels == 4) */ {
             for (i = rpng2_info.width;  i > 0;  --i) {
@@ -1145,12 +1268,12 @@ static void rpng2_x_display_row(ulg row)
                     green = ((ush)g << 8);
                     blue  = ((ush)b << 8);
                 }
-                pixel = ((red   >> RPixelShift) & RedMask)   |
-                        ((green >> GPixelShift) & GreenMask) |
-                        ((blue  >> BPixelShift) & BlueMask);
-                /* recall that we set ximage->byte_order = MSBFirst */
-                *dest++ = ((uch *)&pixel)[1];
-                *dest++ = ((uch *)&pixel)[0];
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
             }
         }
 
@@ -1162,13 +1285,23 @@ static void rpng2_x_display_row(ulg row)
 
 
 /*---------------------------------------------------------------------------
-    Display after every 16 rows or when on last row.  (Region may include
-    previously displayed lines due to interlacing--i.e., not contiguous.)
+    Display after every 16 rows or when on one of last two rows.  (Region
+    may include previously displayed lines due to interlacing--i.e., not
+    contiguous.  Also, second-to-last row is final one in interlaced images
+    with odd number of rows.)  For demos, flush (and delay) after every 16th
+    row so "sparse" passes don't go twice as fast.
   ---------------------------------------------------------------------------*/
 
-    if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {
-        XPutImage(display, window, gc, ximage, 0, firstrow, 0, firstrow,
-          rpng2_info.width, row - firstrow + 1);
+    if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
+        XFlush(display);
+        rows = 0;
+        usleep(usleep_duration);
+    } else
+    if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
         XFlush(display);
         rows = 0;
     }
@@ -1179,7 +1312,7 @@ static void rpng2_x_display_row(ulg row)
 
 
 
-static void rpng2_x_finish_display()
+static void rpng2_x_finish_display(void)
 {
     Trace((stderr, "beginning rpng2_x_finish_display()\n"))
 
@@ -1188,14 +1321,16 @@ static void rpng2_x_finish_display()
      * the image is done */
 
     rpng2_info.done = TRUE;
-    printf("Done.  Press Q, Esc or mouse button 1 to quit.\n");
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
 }
 
 
 
 
 
-static void rpng2_x_cleanup()
+static void rpng2_x_cleanup(void)
 {
     if (bg_image && bg_data) {
         free(bg_data);
@@ -1228,6 +1363,9 @@ static void rpng2_x_cleanup()
 
     if (have_colormap)
         XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
 }
 
 

contrib/gregbook/wpng.c

@@ -19,7 +19,15 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options
+    - 1.03:  removed extraneous character from usage screen; fixed bug in
+              command-line parsing
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -45,7 +53,7 @@
   ---------------------------------------------------------------------------*/
 
 #define PROGNAME  "wpng"
-#define VERSION   "1.01 of 31 March 1999"
+#define VERSION   "1.03 of 19 March 2000"
 #define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"
 
 #if defined(__MSDOS__) || defined(__OS2__)
@@ -57,27 +65,27 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <setjmp.h>	/* for jmpbuf declaration in writepng.h */
+#include <setjmp.h>     /* for jmpbuf declaration in writepng.h */
 #include <time.h>
 
 #ifdef DOS_OS2_W32
-#  include <io.h>	/* for isatty(), setmode() prototypes */
-#  include <fcntl.h>	/* O_BINARY for fdopen() without text translation */
+#  include <io.h>       /* for isatty(), setmode() prototypes */
+#  include <fcntl.h>    /* O_BINARY for fdopen() without text translation */
 #  ifdef __EMX__
 #    ifndef getch
-#      define getch() _read_kbd(0, 1, 0)	/* need getche() */
+#      define getch() _read_kbd(0, 1, 0)    /* need getche() */
 #    endif
 #  else /* !__EMX__ */
 #    ifdef __GO32__
 #      include <pc.h>
-#      define getch() getkey()	/* GRR:  need getche() */
+#      define getch() getkey()  /* GRR:  need getche() */
 #    else
-#      include <conio.h>	/* for getche() console input */
+#      include <conio.h>        /* for getche() console input */
 #    endif
 #  endif /* ?__EMX__ */
 #  define FGETS(buf,len,stream)  dos_kbd_gets(buf,len)
 #else
-#  include <unistd.h>		/* for isatty() prototype */
+#  include <unistd.h>           /* for isatty() prototype */
 #  define FGETS fgets
 #endif
 
@@ -87,7 +95,7 @@
    text that includes control characters discouraged by the PNG spec; text
    that includes an escape character (27) must be re-entered regardless */
 
-#include "writepng.h"	/* typedefs, common macros, writepng prototypes */
+#include "writepng.h"   /* typedefs, common macros, writepng prototypes */
 
 
 
@@ -112,7 +120,7 @@ int main(int argc, char **argv)
     FILE *keybd;
 #endif
 #ifdef sgi
-    FILE *tmpfile;	/* or we could just use keybd, since no overlap */
+    FILE *tmpfile;      /* or we could just use keybd, since no overlap */
     char tmpline[80];
 #endif
     char *inname = NULL, outname[256];
@@ -204,36 +212,40 @@ int main(int argc, char **argv)
     /* Now parse the command line for options and the PNM filename. */
 
     while (*++argv && !error) {
-        if (!strcmp(*argv, "-interlaced")) {
+        if (!strncmp(*argv, "-i", 2)) {
             wpng_info.interlaced = TRUE;
-        } else if (!strcmp(*argv, "-time")) {
+        } else if (!strncmp(*argv, "-time", 3)) {
             wpng_info.modtime = time(NULL);
             wpng_info.have_time = TRUE;
-        } else if (!strcmp(*argv, "-text")) {
+        } else if (!strncmp(*argv, "-text", 3)) {
             text = TRUE;
-        } else if (!strcmp(*argv, "-gamma")) {
+        } else if (!strncmp(*argv, "-gamma", 2)) {
             if (!*++argv)
                 ++error;
-            wpng_info.gamma = atof(*argv);
-            if (wpng_info.gamma <= 0.0)
-                ++error;
-            else if (wpng_info.gamma > 1.01)
-                fprintf(stderr, PROGNAME
-                  " warning:  file gammas are usually less than 1.0\n");
-        } else if (!strcmp(*argv, "-bgcolor")) {
-            if (!*++argv)
-                ++error;
-            bgstr = *argv;
-            if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                ++error;
             else {
-                unsigned r, g, b;  /* this approach quiets compiler warnings */
+                wpng_info.gamma = atof(*argv);
+                if (wpng_info.gamma <= 0.0)
+                    ++error;
+                else if (wpng_info.gamma > 1.01)
+                    fprintf(stderr, PROGNAME
+                      " warning:  file gammas are usually less than 1.0\n");
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    unsigned r, g, b;  /* this way quiets compiler warnings */
 
-                sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
-                wpng_info.bg_red   = (uch)r;
-                wpng_info.bg_green = (uch)g;
-                wpng_info.bg_blue  = (uch)b;
-                wpng_info.have_bg = TRUE;
+                    sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+                    wpng_info.bg_red   = (uch)r;
+                    wpng_info.bg_green = (uch)g;
+                    wpng_info.bg_blue  = (uch)b;
+                    wpng_info.have_bg = TRUE;
+                }
             }
         } else {
             if (**argv != '-') {
@@ -269,7 +281,7 @@ int main(int argc, char **argv)
                   ":  unable to reopen stdout in binary mode\n");
                 fclose(wpng_info.infile);
                 ++error;
-            } else 
+            } else
                 wpng_info.filter = TRUE;
         }
     } else if ((len = strlen(inname)) > 250) {
@@ -362,7 +374,7 @@ int main(int argc, char **argv)
          "\t\t  (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
          "\t\t  first varies, second is usually 2.2, all are positive)\n"
          "    bg  \tdesired background color for alpha-channel images, in\n"
-         "\t\t  7-character hex RGB format (e.g., ``#ff7f00'' for orange:\n"
+         "\t\t  7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
          "\t\t  same as HTML colors)\n"
          "    -text\tprompt interactively for text info (tEXt chunks)\n"
          "    -time\tinclude a tIME chunk (last modification time)\n"
@@ -419,7 +431,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_TITLE;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_TITLE;
                         valid = FALSE;
                     }
@@ -449,7 +461,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_AUTHOR;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_AUTHOR;
                         valid = FALSE;
                     }
@@ -489,7 +501,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_DESC;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_DESC;
                         valid = FALSE;
                     }
@@ -519,7 +531,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_COPY;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_COPY;
                         valid = FALSE;
                     }
@@ -549,7 +561,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_EMAIL;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_EMAIL;
                         valid = FALSE;
                     }
@@ -579,7 +591,7 @@ int main(int argc, char **argv)
                     wpng_info.have_text &= ~TEXT_URL;
                     valid = FALSE;
 #else
-                    if (p[result] == 27) {	/* escape character */
+                    if (p[result] == 27) {    /* escape character */
                         wpng_info.have_text &= ~TEXT_URL;
                         valid = FALSE;
                     }
@@ -743,10 +755,10 @@ static int wpng_isvalid_latin1(uch *p, int len)
 
     for (i = 0;  i < len;  ++i) {
         if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160)
-            continue;		/* character is completely OK */
+            continue;           /* character is completely OK */
         if (result < 0 || (p[result] != 27 && p[i] == 27))
-            result = i;		/* mark location of first questionable one */
-    }                  		/*  or of first escape character (bad) */
+            result = i;         /* mark location of first questionable one */
+    }                           /*  or of first escape character (bad) */
 
     return result;
 }
@@ -755,7 +767,7 @@ static int wpng_isvalid_latin1(uch *p, int len)
 
 
 
-static void wpng_cleanup()
+static void wpng_cleanup(void)
 {
     if (wpng_info.outfile) {
         fclose(wpng_info.outfile);
@@ -791,11 +803,11 @@ static char *dos_kbd_gets(char *buf, int len)
         buf[count++] = ch = getche();
     } while (ch != '\r' && count < len-1);
 
-    buf[count--] = '\0';	/* terminate string */
-    if (buf[count] == '\r')	/* Enter key makes CR, so change to newline */
+    buf[count--] = '\0';        /* terminate string */
+    if (buf[count] == '\r')     /* Enter key makes CR, so change to newline */
         buf[count] = '\n';
 
-    fprintf(stderr, "\n");	/* Enter key does *not* cause a newline */
+    fprintf(stderr, "\n");      /* Enter key does *not* cause a newline */
     fflush(stderr);
 
     return buf;

contrib/gregbook/writepng.c

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
@@ -30,10 +30,10 @@
   ---------------------------------------------------------------------------*/
 
 
-#include <stdlib.h>	/* for exit() prototype */
+#include <stdlib.h>     /* for exit() prototype */
 
-#include "png.h"	/* libpng header; includes zlib.h and setjmp.h */
-#include "writepng.h"	/* typedefs, common macros, public prototypes */
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include "writepng.h"   /* typedefs, common macros, public prototypes */
 
 
 /* local prototype */
@@ -42,13 +42,13 @@ static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
 
 
 
-void writepng_version_info()
+void writepng_version_info(void)
 {
   fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
     PNG_LIBPNG_VER_STRING, png_libpng_ver);
   fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
     ZLIB_VERSION, zlib_version);
-} 
+}
 
 
 

contrib/gregbook/writepng.h

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-1999 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors

contrib/msvctest/README.txt

@@ -0,0 +1,22 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for
+msvctest
+
+Assumes that libpng DLLs and LIBs are in ..\..\projects\msvc\win32\libpng
+Assumes that zlib DLLs and LIBs are in ..\..\projects\msvc\win32\zlib
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration".
+   Choose the configuration that corresponds to the library you want to test.
+   This library must have been built using the libpng MS project located in
+   the "mscv" subdirectory.
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) The test results should appear in the "Build" pane of the Output Window.
+
+
+Simon-Pierre Cadieux
+Methodex Computer Systems Inc.

contrib/msvctest/msvctest.dsp

@@ -0,0 +1,247 @@
+# Microsoft Developer Studio Project File - Name="msvctest" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Console Application" 0x0103
+
+CFG=msvctest - Win32 Debug DLL
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "msvctest.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "msvctest.mak" CFG="msvctest - Win32 Debug DLL"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "msvctest - Win32 DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 ASM DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug ASM DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 LIB" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug LIB" (based on "Win32 (x86) Console Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "msvctest - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "dll"
+# PROP BASE Intermediate_Dir "dll"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll"
+# PROP Intermediate_Dir "dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll\libpng2.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\dll
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll;..\..\projects\msvc\win32\zlib\dll;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "dll_dbg"
+# PROP BASE Intermediate_Dir "dll_dbg"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbg"
+# PROP Intermediate_Dir "dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbg\libpng2d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\dll_dbg
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbg;..\..\projects\msvc\win32\zlib\dll_dbg;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 ASM DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "dll_asm"
+# PROP BASE Intermediate_Dir "dll_asm"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll_asm"
+# PROP Intermediate_Dir "dll_asm"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_asm\libpng2a.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\dll_asm
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_asm;..\..\projects\msvc\win32\zlib\dll_asm;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug ASM DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "dll_dbga"
+# PROP BASE Intermediate_Dir "dll_dbga"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbga"
+# PROP Intermediate_Dir "dll_dbga"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbga\libpng2b.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\dll_dbga
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbga;..\..\projects\msvc\win32\zlib\dll_dbga;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "lib"
+# PROP BASE Intermediate_Dir "lib"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "lib"
+# PROP Intermediate_Dir "lib"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\lib\libpng.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\lib
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "lib_dbg"
+# PROP BASE Intermediate_Dir "lib_dbg"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "lib_dbg"
+# PROP Intermediate_Dir "lib_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\lib_dbg\libpng.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\lib_dbg
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ENDIF 
+
+# Begin Target
+
+# Name "msvctest - Win32 DLL"
+# Name "msvctest - Win32 Debug DLL"
+# Name "msvctest - Win32 ASM DLL"
+# Name "msvctest - Win32 Debug ASM DLL"
+# Name "msvctest - Win32 LIB"
+# Name "msvctest - Win32 Debug LIB"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\pngtest.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\README.txt
+# PROP Exclude_From_Build 1
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# End Group
+# End Target
+# End Project

contrib/msvctest/msvctest.dsw

@@ -0,0 +1,29 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "msvctest"=.\msvctest.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

contrib/pngminus/README

@@ -1,4 +1,4 @@
-PngMinus 
+PngMinus
 --------
 (copyright Willem van Schaik, 1999)
 
@@ -19,7 +19,7 @@ Some history
 Soon after the creation of PNG in 1995, the need was felt for a set of
 pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
 (Willem van Schaik) started such a project. Luckily we discovered this
-and merged the two together into pnmtopng.tar.gz, which is available 
+and merged the two together into pnmtopng.tar.gz, which is available
 from a/o ftp://swrinde.nde.swri.edu/pub/png/.
 
 These two utilities have many, many options and make use of most of the

contrib/pngminus/makevms.com

@@ -39,15 +39,15 @@ $ write sys$output "Compiling PNG contrib programs ..."
 $   write sys$output "Building pnm2png..."
 $   CALL MAKE pnm2png.OBJ "cc ''CCOPT' pnm2png" -
 	pnm2png.c
-$   call make pnm2png.exe - 
-	"LINK pnm2png,lib.opt/opt" - 
+$   call make pnm2png.exe -
+	"LINK pnm2png,lib.opt/opt" -
 	pnm2png.obj
 $   write sys$output "Building png2pnm..."
 $   CALL MAKE png2pnm.OBJ "cc ''CCOPT' png2pnm" -
 	png2pnm.c
-$   call make pnm2png.exe - 
-	"LINK pnm2png,lib.opt/opt" - 
-	pnm2png.obj
+$   call make png2pnm.exe -
+	"LINK png2pnm,lib.opt/opt" -
+	png2pnm.obj
 $ exit
 $!
 $!

contrib/pngminus/png2pnm.c

@@ -42,6 +42,11 @@
 
 #include "png.h"
 
+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* function prototypes */
 
 int  main (int argc, char *argv[]);
@@ -183,7 +188,7 @@ void usage()
 BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha)
 {
   png_struct    *png_ptr = NULL;
-  png_info		*info_ptr = NULL;
+  png_info	*info_ptr = NULL;
   png_byte      buf[8];
   png_byte      *png_pixels = NULL;
   png_byte      **row_pointers = NULL;
@@ -199,6 +204,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
   int           row, col;
   int           ret;
   int           i;
+  long          dep_16;
 
   /* read and check signature in PNG file */
   ret = fread (buf, 1, 8, png_file);
@@ -217,13 +223,13 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
     return FALSE;   /* out of memory */
 
   info_ptr = png_create_info_struct (png_ptr);
-  if (!info_ptr) 
+  if (!info_ptr)
   {
     png_destroy_read_struct (&png_ptr, NULL, NULL);
     return FALSE;   /* out of memory */
   }
 
-  if (setjmp (png_ptr->jmpbuf)) 
+  if (setjmp (png_jmpbuf(png_ptr)))
   {
     png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
     return FALSE;
@@ -237,7 +243,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
   png_read_info (png_ptr, info_ptr);
 
   /* get size and bit-depth of the PNG-image */
-  png_get_IHDR (png_ptr, info_ptr, 
+  png_get_IHDR (png_ptr, info_ptr,
     &width, &height, &bit_depth, &color_type,
     NULL, NULL, NULL);
 
@@ -294,7 +300,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
   else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
     channels = 4;
   else
-    channels = 0; /* should never happen */    
+    channels = 0; /* should never happen */
   alpha_present = (channels - 1) % 2;
 
   /* check if alpha is expected to be present in file */
@@ -313,7 +319,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
     return FALSE;
   }
 
-  if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL) 
+  if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
   {
     png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
     free (png_pixels);
@@ -374,8 +380,10 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
         if (raw)
           fputc ((int) *pix_ptr++ , pnm_file);
         else
-          if (bit_depth == 16)
-            fprintf (pnm_file, "%ld ", ((long) *pix_ptr++ << 8) + (long) *pix_ptr++);
+          if (bit_depth == 16){
+	    dep_16 = (long) *pix_ptr++;
+            fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
+          }
           else
             fprintf (pnm_file, "%ld ", (long) *pix_ptr++);
       }
@@ -392,8 +400,10 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
           if (raw)
             fputc ((int) *pix_ptr++ , alpha_file);
           else
-            if (bit_depth == 16)
-              fprintf (alpha_file, "%ld ", ((long) *pix_ptr++ << 8) + (long) *pix_ptr++);
+            if (bit_depth == 16){
+	      dep_16 = (long) *pix_ptr++;
+              fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
+	    }  
             else
               fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
         }

contrib/pngminus/pnm2png.c

@@ -40,6 +40,11 @@
 
 #include "png.h"
 
+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* function prototypes */
 
 int  main (int argc, char *argv[]);
@@ -64,9 +69,9 @@ int main(int argc, char *argv[])
 
   for (argi = 1; argi < argc; argi++)
   {
-    if (argv[argi][0] == '-') 
+    if (argv[argi][0] == '-')
     {
-      switch (argv[argi][1]) 
+      switch (argv[argi][1])
       {
         case 'i':
           interlace = TRUE;
@@ -77,7 +82,8 @@ int main(int argc, char *argv[])
           if ((fp_al = fopen (argv[argi], "rb")) == NULL)
           {
             fprintf (stderr, "PNM2PNG\n");
-            fprintf (stderr, "Error:  alpha-channel file %s does not exist\n", argv[argi]);
+            fprintf (stderr, "Error:  alpha-channel file %s does not exist\n",
+               argv[argi]);
             exit (1);
           }
           break;
@@ -385,7 +391,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
   }
 
   /* setjmp() must be called in every function that calls a PNG-reading libpng function */
-  if (setjmp (png_ptr->jmpbuf))
+  if (setjmp (png_jmpbuf(png_ptr)))
   {
     png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
     return FALSE;
@@ -405,7 +411,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
   /* if needed we will allocate memory for an new array of row-pointers */
   if (row_pointers == (unsigned char**) NULL)
   {
-    if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL) 
+    if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
     {
       png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
       return FALSE;
@@ -418,13 +424,13 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
 
   /* write out the entire image data in one call */
   png_write_image (png_ptr, row_pointers);
-    
+
   /* write the additional chuncks to the PNG file (not really needed) */
   png_write_end (png_ptr, info_ptr);
-    
-  /* clean up after the write, and free any memory allocated */    
+
+  /* clean up after the write, and free any memory allocated */
   png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
-        
+
   if (row_pointers != (unsigned char**) NULL)
     free (row_pointers);
   if (png_pixels != (unsigned char*) NULL)
@@ -511,8 +517,8 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
     for (i = 0; i < depth; i++)
       mask = (mask << 1) | 0x01;
 
-  get_token (pnm_file, token);
-  sscanf (token, "%lu", &ret_value);
+  get_token (pnm_file, (char *) token);
+  sscanf ((const char *) token, "%lu", &ret_value);
 
   ret_value &= mask;
 

contrib/visupng/PngFile.c

@@ -0,0 +1,439 @@
+//-------------------------------------
+//  PNGFILE.C -- Image File Functions
+//-------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+#include <windows.h>
+#include <commdlg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "png.h"
+#include "pngfile.h"
+#include "cexcept.h"
+
+define_exception_type(const char *);
+extern struct exception_context the_exception_context[1];
+struct exception_context the_exception_context[1];
+png_const_charp msg;
+
+static OPENFILENAME ofn;
+
+static png_structp png_ptr = NULL;
+static png_infop info_ptr = NULL;
+
+
+// cexcept interface
+
+static void
+png_cexcept_error(png_structp png_ptr, png_const_charp msg)
+{
+   if(png_ptr)
+     ;
+#ifndef PNG_NO_CONSOLE_IO
+   fprintf(stderr, "libpng error: %s\n", msg);
+#endif
+   {
+      Throw msg;
+   }
+}
+
+// Windows open-file functions
+
+void PngFileInitialize (HWND hwnd)
+{
+    static TCHAR szFilter[] = TEXT ("PNG Files (*.PNG)\0*.png\0")
+        TEXT ("All Files (*.*)\0*.*\0\0");
+
+    ofn.lStructSize       = sizeof (OPENFILENAME);
+    ofn.hwndOwner         = hwnd;
+    ofn.hInstance         = NULL;
+    ofn.lpstrFilter       = szFilter;
+    ofn.lpstrCustomFilter = NULL;
+    ofn.nMaxCustFilter    = 0;
+    ofn.nFilterIndex      = 0;
+    ofn.lpstrFile         = NULL;          // Set in Open and Close functions
+    ofn.nMaxFile          = MAX_PATH;
+    ofn.lpstrFileTitle    = NULL;          // Set in Open and Close functions
+    ofn.nMaxFileTitle     = MAX_PATH;
+    ofn.lpstrInitialDir   = NULL;
+    ofn.lpstrTitle        = NULL;
+    ofn.Flags             = 0;             // Set in Open and Close functions
+    ofn.nFileOffset       = 0;
+    ofn.nFileExtension    = 0;
+    ofn.lpstrDefExt       = TEXT ("png");
+    ofn.lCustData         = 0;
+    ofn.lpfnHook          = NULL;
+    ofn.lpTemplateName    = NULL;
+}
+
+BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
+{
+    ofn.hwndOwner         = hwnd;
+    ofn.lpstrFile         = pstrFileName;
+    ofn.lpstrFileTitle    = pstrTitleName;
+    ofn.Flags             = OFN_HIDEREADONLY;
+
+    return GetOpenFileName (&ofn);
+}
+
+BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
+{
+    ofn.hwndOwner         = hwnd;
+    ofn.lpstrFile         = pstrFileName;
+    ofn.lpstrFileTitle    = pstrTitleName;
+    ofn.Flags             = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
+
+    return GetSaveFileName (&ofn);
+}
+
+// PNG image handler functions
+
+BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
+                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor)
+{
+    static FILE        *pfFile;
+    png_byte            pbSig[8];
+    int                 iBitDepth;
+    int                 iColorType;
+    double              dGamma;
+    png_color_16       *pBackground;
+    png_uint_32         ulChannels;
+    png_uint_32         ulRowBytes;
+    png_byte           *pbImageData = *ppbImageData;
+    static png_byte   **ppbRowPointers = NULL;
+    int                 i;
+
+    // open the PNG input file
+
+    if (!pstrFileName)
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    if (!(pfFile = fopen(pstrFileName, "rb")))
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    // first check the eight byte PNG signature
+
+    fread(pbSig, 1, 8, pfFile);
+    if (!png_check_sig(pbSig, 8))
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    // create the two png(-info) structures
+
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
+      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
+    if (!png_ptr)
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr)
+    {
+        png_destroy_read_struct(&png_ptr, NULL, NULL);
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    Try
+    {
+        
+        // initialize the png structure
+        
+#if !defined(PNG_NO_STDIO)
+        png_init_io(png_ptr, pfFile);
+#else
+        png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data);
+#endif
+        
+        png_set_sig_bytes(png_ptr, 8);
+        
+        // read all PNG info up to image data
+        
+        png_read_info(png_ptr, info_ptr);
+        
+        // get width, height, bit-depth and color-type
+        
+        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
+            &iColorType, NULL, NULL, NULL);
+        
+        // expand images of all color-type and bit-depth to 3x8 bit RGB images
+        // let the library process things like alpha, transparency, background
+        
+        if (iBitDepth == 16)
+            png_set_strip_16(png_ptr);
+        if (iColorType == PNG_COLOR_TYPE_PALETTE)
+            png_set_expand(png_ptr);
+        if (iBitDepth < 8)
+            png_set_expand(png_ptr);
+        if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+            png_set_expand(png_ptr);
+        if (iColorType == PNG_COLOR_TYPE_GRAY ||
+            iColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
+            png_set_gray_to_rgb(png_ptr);
+        
+        // set the background color to draw transparent and alpha images over.
+        if (png_get_bKGD(png_ptr, info_ptr, &pBackground))
+        {
+            png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
+            pBkgColor->red   = (byte) pBackground->red;
+            pBkgColor->green = (byte) pBackground->green;
+            pBkgColor->blue  = (byte) pBackground->blue;
+        }
+        else
+        {
+            pBkgColor = NULL;
+        }
+        
+        // if required set gamma conversion
+        if (png_get_gAMA(png_ptr, info_ptr, &dGamma))
+            png_set_gamma(png_ptr, (double) 2.2, dGamma);
+        
+        // after the transformations have been registered update info_ptr data
+        
+        png_read_update_info(png_ptr, info_ptr);
+        
+        // get again width, height and the new bit-depth and color-type
+        
+        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
+            &iColorType, NULL, NULL, NULL);
+        
+        
+        // row_bytes is the width x number of channels
+        
+        ulRowBytes = png_get_rowbytes(png_ptr, info_ptr);
+        ulChannels = png_get_channels(png_ptr, info_ptr);
+        
+        *piChannels = ulChannels;
+        
+        // now we can allocate memory to store the image
+        
+        if (pbImageData)
+        {
+            free (pbImageData);
+            pbImageData = NULL;
+        }
+        if ((pbImageData = (png_byte *) malloc(ulRowBytes * (*piHeight)
+                            * sizeof(png_byte))) == NULL)
+        {
+            png_error(png_ptr, "Visual PNG: out of memory");
+        }
+        *ppbImageData = pbImageData;
+        
+        // and allocate memory for an array of row-pointers
+        
+        if ((ppbRowPointers = (png_bytepp) malloc((*piHeight)
+                            * sizeof(png_bytep))) == NULL)
+        {
+            png_error(png_ptr, "Visual PNG: out of memory");
+        }
+        
+        // set the individual row-pointers to point at the correct offsets
+        
+        for (i = 0; i < (*piHeight); i++)
+            ppbRowPointers[i] = pbImageData + i * ulRowBytes;
+        
+        // now we can go ahead and just read the whole image
+        
+        png_read_image(png_ptr, ppbRowPointers);
+        
+        // read the additional chunks in the PNG file (not really needed)
+        
+        png_read_end(png_ptr, NULL);
+        
+        // and we're done
+        
+        free (ppbRowPointers);
+        ppbRowPointers = NULL;
+        
+        // yepp, done
+    }
+
+    Catch (msg)
+    {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+
+        *ppbImageData = pbImageData = NULL;
+        
+        if(ppbRowPointers)
+            free (ppbRowPointers);
+
+        fclose(pfFile);
+
+        return FALSE;
+    }
+
+    fclose (pfFile);
+
+    return TRUE;
+}
+
+
+BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
+                   int iWidth, int iHeight, png_color bkgColor)
+{
+    const int           ciBitDepth = 8;
+    const int           ciChannels = 3;
+
+    static FILE        *pfFile;
+    png_uint_32         ulRowBytes;
+    static png_byte   **ppbRowPointers = NULL;
+    int                 i;
+
+    // open the PNG output file
+
+    if (!pstrFileName)
+        return FALSE;
+
+    if (!(pfFile = fopen(pstrFileName, "wb")))
+        return FALSE;
+
+    // prepare the standard PNG structures
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
+      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
+    if (!png_ptr)
+    {
+        fclose(pfFile);
+        return FALSE;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr) {
+        fclose(pfFile);
+        png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
+        return FALSE;
+    }
+
+    Try
+    {
+        // initialize the png structure
+        
+#if !defined(PNG_NO_STDIO)
+        png_init_io(png_ptr, pfFile);
+#else
+        png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush);
+#endif
+        
+        // we're going to write a very simple 3x8 bit RGB image
+        
+        png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth,
+            PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
+            PNG_FILTER_TYPE_BASE);
+        
+        // write the file header information
+        
+        png_write_info(png_ptr, info_ptr);
+        
+        // swap the BGR pixels in the DiData structure to RGB
+        
+        png_set_bgr(png_ptr);
+        
+        // row_bytes is the width x number of channels
+        
+        ulRowBytes = iWidth * ciChannels;
+        
+        // we can allocate memory for an array of row-pointers
+        
+        if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL)
+            Throw "Visualpng: Out of memory";
+        
+        // set the individual row-pointers to point at the correct offsets
+        
+        for (i = 0; i < iHeight; i++)
+            ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2);
+        
+        // write out the entire image data in one call
+        
+        png_write_image (png_ptr, ppbRowPointers);
+        
+        // write the additional chunks to the PNG file (not really needed)
+        
+        png_write_end(png_ptr, info_ptr);
+        
+        // and we're done
+        
+        free (ppbRowPointers);
+        ppbRowPointers = NULL;
+        
+        // clean up after the write, and free any memory allocated
+        
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        
+        // yepp, done
+    }
+
+    Catch (msg)
+    {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+
+        if(ppbRowPointers)
+            free (ppbRowPointers);
+
+        fclose(pfFile);
+
+        return FALSE;
+    }
+    
+    fclose (pfFile);
+    
+    return TRUE;
+}
+
+#ifdef PNG_NO_STDIO
+
+static void
+png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_size_t check;
+
+   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
+    * instead of an int, which is what fread() actually returns.
+    */
+   check = (png_size_t)fread(data, (png_size_t)1, length,
+      (FILE *)png_ptr->io_ptr);
+
+   if (check != length)
+   {
+      png_error(png_ptr, "Read Error");
+   }
+}
+
+static void
+png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_uint_32 check;
+
+   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+   if (check != length)
+   {
+      png_error(png_ptr, "Write Error");
+   }
+}
+
+static void
+png_flush(png_structp png_ptr)
+{
+   FILE *io_ptr;
+   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+   if (io_ptr != NULL)
+      fflush(io_ptr);
+}
+
+#endif
+
+//-----------------
+//  end of source
+//-----------------

contrib/visupng/PngFile.h

@@ -0,0 +1,27 @@
+//------------------------------------------
+//  PNGFILE.H -- Header File for pngfile.c
+//------------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+void PngFileInitialize (HWND hwnd) ;
+BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
+BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
+
+BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, 
+                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor);
+BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
+                   int iWidth, int iHeight, png_color BkgColor);
+
+#if defined(PNG_NO_STDIO)
+static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
+static void png_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
+static void png_flush(png_structp png_ptr);
+#endif
+

contrib/visupng/README.txt

@@ -0,0 +1,58 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for VisualPng
+------------------------------------------------------------------------
+
+Copyright 2000, Willem van Schaik.  For conditions of distribution and
+use, see the copyright/license/disclaimer notice in png.h
+
+As a PNG .dll demo VisualPng is finished. More features would only hinder
+the program's objective. However, further extensions (like support for other 
+graphics formats) are in development. To get these, or for pre-compiled 
+binaries, go to "http://www.schaik.com/png/visualpng.html".
+
+------------------------------------------------------------------------
+
+Assumes that
+
+   libpng DLLs and LIBs are in ..\..\projects\msvc\win32\libpng
+   zlib DLLs and LIBs are in   ..\..\projects\msvc\win32\zlib
+   libpng header files are in  ..\..\..\libpng
+   zlib header files are in    ..\..\..\zlib
+   the pngsuite images are in  ..\pngsuite
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration".
+   Choose the configuration that corresponds to the library you want to test.
+   This library must have been built using the libpng MS project located in
+   the "..\..\mscv" subdirectory.
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) After compiling and linking VisualPng will be started to view an image
+   from the PngSuite directory.  Press Ctrl-N (and Ctrl-V) for other images.
+
+
+To install:
+
+When distributing VisualPng (or a further development) the following options
+are available:
+
+1) Build the program with the configuration "Win32 LIB" and you only need to
+   include the executable from the ./lib directory in your distribution.
+
+2) Build the program with the configuration "Win32 DLL" and you need to put
+   in your distribution the executable from the ./dll directory and the dll's
+   libpng1.dll, zlib.dll and msvcrt.dll.  These need to be in the user's PATH.
+
+
+Willem van Schaik
+Calgary, June 6th 2000
+
+P.S. VisualPng was written based on preliminary work of:
+
+    - Simon-Pierre Cadieux
+    - Glenn Randers-Pehrson
+    - Greg Roelofs
+

contrib/visupng/VisualPng.c

@@ -0,0 +1,961 @@
+//------------------------------------
+//  VisualPng.C -- Shows a PNG image
+//------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+// switches
+
+// defines
+
+#define PROGNAME  "VisualPng"
+#define LONGNAME  "Win32 Viewer for PNG-files"
+#define VERSION   "1.0 of 2000 June 07"
+
+// constants
+
+#define MARGIN 8
+
+// standard includes
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+// application includes
+
+#include "png.h"
+#include "pngfile.h"
+#include "resource.h"
+
+// macros
+
+// function prototypes
+
+LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
+BOOL    CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
+
+BOOL CenterAbout (HWND hwndChild, HWND hwndParent);
+
+BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
+        int *pFileIndex);
+
+BOOL SearchPngList (TCHAR *pFileList, int FileCount, int *pFileIndex,
+        PTSTR pstrPrevName, PTSTR pstrNextName);
+
+BOOL LoadImageFile(HWND hwnd, PTSTR pstrPathName,
+        png_byte **ppbImage, int *pxImgSize, int *pyImgSize, int *piChannels,
+        png_color *pBkgColor);
+
+BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
+        BYTE **ppDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched);
+
+BOOL InitBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize);
+
+BOOL FillBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched);
+
+// a few global variables
+
+static char *szProgName = PROGNAME;
+static char *szAppName = LONGNAME;
+static char *szIconName = PROGNAME;
+static char szCmdFileName [MAX_PATH];
+
+// MAIN routine
+
+int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
+                    PSTR szCmdLine, int iCmdShow)
+{
+    HACCEL   hAccel;
+    HWND     hwnd;
+    MSG      msg;
+    WNDCLASS wndclass;
+    int ixBorders, iyBorders;
+
+    wndclass.style         = CS_HREDRAW | CS_VREDRAW;
+    wndclass.lpfnWndProc   = WndProc;
+    wndclass.cbClsExtra    = 0;
+    wndclass.cbWndExtra    = 0;
+    wndclass.hInstance     = hInstance;
+    wndclass.hIcon         = LoadIcon (hInstance, szIconName) ;
+    wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW);
+    wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH);
+    wndclass.lpszMenuName  = szProgName;
+    wndclass.lpszClassName = szProgName;
+
+    if (!RegisterClass (&wndclass))
+    {
+        MessageBox (NULL, TEXT ("Error: this program requires Windows NT!"),
+            szProgName, MB_ICONERROR);
+        return 0;
+    }
+
+    // if filename given on commandline, store it
+    if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
+        if (szCmdLine[0] == '"')
+            strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
+        else
+            strcpy (szCmdFileName, szCmdLine);
+    else
+        strcpy (szCmdFileName, "");
+
+    // calculate size of window-borders
+    ixBorders = 2 * (GetSystemMetrics (SM_CXBORDER) +
+                     GetSystemMetrics (SM_CXDLGFRAME));
+    iyBorders = 2 * (GetSystemMetrics (SM_CYBORDER) +
+                     GetSystemMetrics (SM_CYDLGFRAME)) +
+                     GetSystemMetrics (SM_CYCAPTION) +
+                     GetSystemMetrics (SM_CYMENUSIZE) +
+                     1; /* WvS: don't ask me why? */
+
+    hwnd = CreateWindow (szProgName, szAppName,
+        WS_OVERLAPPEDWINDOW,
+        CW_USEDEFAULT, CW_USEDEFAULT,
+        512 + 2 * MARGIN + ixBorders, 384 + 2 * MARGIN + iyBorders,
+//      CW_USEDEFAULT, CW_USEDEFAULT,
+        NULL, NULL, hInstance, NULL);
+
+    ShowWindow (hwnd, iCmdShow);
+    UpdateWindow (hwnd);
+
+    hAccel = LoadAccelerators (hInstance, szProgName);
+
+    while (GetMessage (&msg, NULL, 0, 0))
+    {
+        if (!TranslateAccelerator (hwnd, hAccel, &msg))
+        {
+            TranslateMessage (&msg);
+            DispatchMessage (&msg);
+        }
+    }
+    return msg.wParam;
+}
+
+LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
+        LPARAM lParam)
+{
+    static HINSTANCE          hInstance ;
+    static HDC                hdc;
+    static PAINTSTRUCT        ps;
+    static HMENU              hMenu;
+
+    static BITMAPFILEHEADER  *pbmfh;
+    static BITMAPINFOHEADER  *pbmih;
+    static BYTE              *pbImage;
+    static int                cxWinSize, cyWinSize;
+    static int                cxImgSize, cyImgSize;
+    static int                cImgChannels;
+    static png_color          bkgColor = {127, 127, 127};
+
+    static BOOL               bStretched = TRUE;
+
+    static BYTE              *pDib = NULL;
+    static BYTE              *pDiData = NULL;
+
+    static TCHAR              szImgPathName [MAX_PATH];
+    static TCHAR              szTitleName [MAX_PATH];
+
+    static TCHAR             *pPngFileList = NULL;
+    static int                iPngFileCount;
+    static int                iPngFileIndex;
+
+    BOOL                      bOk;
+
+    switch (message)
+    {
+    case WM_CREATE:
+        hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
+        PngFileInitialize (hwnd);
+
+        strcpy (szImgPathName, "");
+
+        // in case we process file given on command-line
+
+        if (szCmdFileName[0] != '\0')
+        {
+            strcpy (szImgPathName, szCmdFileName);
+
+            // read the other png-files in the directory for later
+            // next/previous commands
+
+            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
+                          &iPngFileIndex);
+
+            // load the image from file
+
+            if (!LoadImageFile (hwnd, szImgPathName,
+                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                return 0;
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+        }
+
+        return 0;
+
+    case WM_SIZE:
+        cxWinSize = LOWORD (lParam);
+        cyWinSize = HIWORD (lParam);
+
+        // invalidate the client area for later update
+
+        InvalidateRect (hwnd, NULL, TRUE);
+
+        // display the PNG into the DIBitmap
+
+        DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+            pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+        return 0;
+
+    case WM_INITMENUPOPUP:
+        hMenu = GetMenu (hwnd);
+
+        if (pbImage)
+            EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_ENABLED);
+        else
+            EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_GRAYED);
+
+        return 0;
+
+    case WM_COMMAND:
+        hMenu = GetMenu (hwnd);
+
+        switch (LOWORD (wParam))
+        {
+        case IDM_FILE_OPEN:
+
+            // show the File Open dialog box
+
+            if (!PngFileOpenDlg (hwnd, szImgPathName, szTitleName))
+                return 0;
+
+            // read the other png-files in the directory for later
+            // next/previous commands
+
+            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
+                          &iPngFileIndex);
+
+            // load the image from file
+
+            if (!LoadImageFile (hwnd, szImgPathName,
+                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                return 0;
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+            return 0;
+
+        case IDM_FILE_SAVE:
+
+            // show the File Save dialog box
+
+            if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
+                return 0;
+
+            // save the PNG to a disk file
+
+            SetCursor (LoadCursor (NULL, IDC_WAIT));
+            ShowCursor (TRUE);
+
+            bOk = PngSaveImage (szImgPathName, pDiData, cxWinSize, cyWinSize,
+                  bkgColor);
+
+            ShowCursor (FALSE);
+            SetCursor (LoadCursor (NULL, IDC_ARROW));
+
+            if (!bOk)
+                MessageBox (hwnd, TEXT ("Error in saving the PNG image"),
+                szProgName, MB_ICONEXCLAMATION | MB_OK);
+            return 0;
+
+        case IDM_FILE_NEXT:
+
+            // read next entry in the directory
+
+            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
+                NULL, szImgPathName))
+            {
+                if (strcmp (szImgPathName, "") == 0)
+                    return 0;
+                
+                // load the image from file
+                
+                if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
+                        &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                    return 0;
+                
+                // invalidate the client area for later update
+                
+                InvalidateRect (hwnd, NULL, TRUE);
+                
+                // display the PNG into the DIBitmap
+                
+                DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                    pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+            }
+            
+            return 0;
+
+        case IDM_FILE_PREVIOUS:
+
+            // read previous entry in the directory
+
+            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
+                szImgPathName, NULL))
+            {
+                
+                if (strcmp (szImgPathName, "") == 0)
+                    return 0;
+                
+                // load the image from file
+                
+                if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
+                    &cyImgSize, &cImgChannels, &bkgColor))
+                    return 0;
+                
+                // invalidate the client area for later update
+                
+                InvalidateRect (hwnd, NULL, TRUE);
+                
+                // display the PNG into the DIBitmap
+                
+                DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                    pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+            }
+
+            return 0;
+
+        case IDM_FILE_EXIT:
+
+            // more cleanup needed...
+
+            // free image buffer
+
+            if (pDib != NULL)
+            {
+                free (pDib);
+                pDib = NULL;
+            }
+
+            // free file-list
+
+            if (pPngFileList != NULL)
+            {
+                free (pPngFileList);
+                pPngFileList = NULL;
+            }
+
+            // let's go ...
+
+            exit (0);
+
+            return 0;
+
+        case IDM_OPTIONS_STRETCH:
+            bStretched = !bStretched;
+            if (bStretched)
+                CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_CHECKED);
+            else
+                CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+            return 0;
+
+        case IDM_HELP_ABOUT:
+            DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
+            return 0;
+
+        } // end switch
+
+        break;
+
+    case WM_PAINT:
+        hdc = BeginPaint (hwnd, &ps);
+
+        if (pDib)
+            SetDIBitsToDevice (hdc, 0, 0, cxWinSize, cyWinSize, 0, 0,
+                0, cyWinSize, pDiData, (BITMAPINFO *) pDib, DIB_RGB_COLORS);
+
+        EndPaint (hwnd, &ps);
+        return 0;
+
+    case WM_DESTROY:
+        if (pbmfh)
+        {
+            free (pbmfh);
+            pbmfh = NULL;
+        }
+
+        PostQuitMessage (0);
+        return 0;
+    }
+
+    return DefWindowProc (hwnd, message, wParam, lParam);
+}
+
+BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
+                            WPARAM wParam, LPARAM lParam)
+{
+     switch (message)
+     {
+     case WM_INITDIALOG :
+          ShowWindow (hDlg, SW_HIDE);
+          CenterAbout (hDlg, GetWindow (hDlg, GW_OWNER));
+          ShowWindow (hDlg, SW_SHOW);
+          return TRUE ;
+
+     case WM_COMMAND :
+          switch (LOWORD (wParam))
+          {
+          case IDOK :
+          case IDCANCEL :
+               EndDialog (hDlg, 0) ;
+               return TRUE ;
+          }
+          break ;
+     }
+     return FALSE ;
+}
+
+//---------------
+//  CenterAbout
+//---------------
+
+BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
+{
+   RECT    rChild, rParent, rWorkArea;
+   int     wChild, hChild, wParent, hParent;
+   int     xNew, yNew;
+   BOOL  bResult;
+
+   // Get the Height and Width of the child window
+   GetWindowRect (hwndChild, &rChild);
+   wChild = rChild.right - rChild.left;
+   hChild = rChild.bottom - rChild.top;
+
+   // Get the Height and Width of the parent window
+   GetWindowRect (hwndParent, &rParent);
+   wParent = rParent.right - rParent.left;
+   hParent = rParent.bottom - rParent.top;
+
+   // Get the limits of the 'workarea'
+   bResult = SystemParametersInfo(
+      SPI_GETWORKAREA,  // system parameter to query or set
+      sizeof(RECT),
+      &rWorkArea,
+      0);
+   if (!bResult) {
+      rWorkArea.left = rWorkArea.top = 0;
+      rWorkArea.right = GetSystemMetrics(SM_CXSCREEN);
+      rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
+   }
+
+   // Calculate new X position, then adjust for workarea
+   xNew = rParent.left + ((wParent - wChild) /2);
+   if (xNew < rWorkArea.left) {
+      xNew = rWorkArea.left;
+   } else if ((xNew+wChild) > rWorkArea.right) {
+      xNew = rWorkArea.right - wChild;
+   }
+
+   // Calculate new Y position, then adjust for workarea
+   yNew = rParent.top  + ((hParent - hChild) /2);
+   if (yNew < rWorkArea.top) {
+      yNew = rWorkArea.top;
+   } else if ((yNew+hChild) > rWorkArea.bottom) {
+      yNew = rWorkArea.bottom - hChild;
+   }
+
+   // Set it, and return
+   return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
+          SWP_NOZORDER);
+}
+
+//----------------
+//  BuildPngList
+//----------------
+
+BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
+     int *pFileIndex)
+{
+    static TCHAR              szImgPathName [MAX_PATH];
+    static TCHAR              szImgFileName [MAX_PATH];
+    static TCHAR              szImgFindName [MAX_PATH];
+
+    WIN32_FIND_DATA           finddata;
+    HANDLE                    hFind;
+
+    static TCHAR              szTmp [MAX_PATH];
+    BOOL                      bOk;
+    int                       i, ii;
+    int                       j, jj;
+
+    // free previous file-list
+
+    if (*ppFileList != NULL)
+    {
+        free (*ppFileList);
+        *ppFileList = NULL;
+    }
+
+    // extract foldername, filename and search-name
+
+    strcpy (szImgPathName, pstrPathName);
+    strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
+
+    strcpy (szImgFindName, szImgPathName);
+    *(strrchr (szImgFindName, '\\') + 1) = '\0';
+    strcat (szImgFindName, "*.png");
+
+    // first cycle: count number of files in directory for memory allocation
+
+    *pFileCount = 0;
+
+    hFind = FindFirstFile(szImgFindName, &finddata);
+    bOk = (hFind != (HANDLE) -1);
+
+    while (bOk)
+    {
+        *pFileCount += 1;
+        bOk = FindNextFile(hFind, &finddata);
+    }
+    FindClose(hFind);
+
+    // allocation memory for file-list
+
+    *ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);
+
+    // second cycle: read directory and store filenames in file-list
+
+    hFind = FindFirstFile(szImgFindName, &finddata);
+    bOk = (hFind != (HANDLE) -1);
+
+    i = 0;
+    ii = 0;
+    while (bOk)
+    {
+        strcpy (*ppFileList + ii, szImgPathName);
+        strcpy (strrchr(*ppFileList + ii, '\\') + 1, finddata.cFileName);
+
+        if (strcmp(pstrPathName, *ppFileList + ii) == 0)
+            *pFileIndex = i;
+
+        ii += MAX_PATH;
+        i++;
+
+        bOk = FindNextFile(hFind, &finddata);
+    }
+    FindClose(hFind);
+
+    // finally we must sort the file-list
+
+    for (i = 0; i < *pFileCount - 1; i++)
+    {
+        ii = i * MAX_PATH;
+        for (j = i+1; j < *pFileCount; j++)
+        {
+            jj = j * MAX_PATH;
+            if (strcmp (*ppFileList + ii, *ppFileList + jj) > 0)
+            {
+                strcpy (szTmp, *ppFileList + jj);
+                strcpy (*ppFileList + jj, *ppFileList + ii);
+                strcpy (*ppFileList + ii, szTmp);
+
+                // check if this was the current image that we moved
+
+                if (*pFileIndex == i)
+                    *pFileIndex = j;
+                else
+                    if (*pFileIndex == j)
+                        *pFileIndex = i;
+            }
+        }
+    }
+
+    return TRUE;
+}
+
+//----------------
+//  SearchPngList
+//----------------
+
+BOOL SearchPngList (
+        TCHAR *pFileList, int FileCount, int *pFileIndex,
+        PTSTR pstrPrevName, PTSTR pstrNextName)
+{
+    if (FileCount > 0)
+    {
+        // get previous entry
+        
+        if (pstrPrevName != NULL)
+        {
+            if (*pFileIndex > 0)
+                *pFileIndex -= 1;
+            else
+                *pFileIndex = FileCount - 1;
+            
+            strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH));
+        }
+        
+        // get next entry
+        
+        if (pstrNextName != NULL)
+        {
+            if (*pFileIndex < FileCount - 1)
+                *pFileIndex += 1;
+            else
+                *pFileIndex = 0;
+            
+            strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH));
+        }
+        
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+//-----------------
+//  LoadImageFile
+//-----------------
+
+BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
+                png_byte **ppbImage, int *pxImgSize, int *pyImgSize,
+                int *piChannels, png_color *pBkgColor)
+{
+    static TCHAR szTmp [MAX_PATH];
+
+    // if there's an existing PNG, free the memory
+
+    if (*ppbImage)
+    {
+        free (*ppbImage);
+        *ppbImage = NULL;
+    }
+
+    // Load the entire PNG into memory
+
+    SetCursor (LoadCursor (NULL, IDC_WAIT));
+    ShowCursor (TRUE);
+
+    PngLoadImage (pstrPathName, ppbImage, pxImgSize, pyImgSize, piChannels,
+                  pBkgColor);
+
+    ShowCursor (FALSE);
+    SetCursor (LoadCursor (NULL, IDC_ARROW));
+
+    if (*ppbImage != NULL)
+    {
+        sprintf (szTmp, "VisualPng - %s", strrchr(pstrPathName, '\\') + 1);
+        SetWindowText (hwnd, szTmp);
+    }
+    else
+    {
+        MessageBox (hwnd, TEXT ("Error in loading the PNG image"),
+            szProgName, MB_ICONEXCLAMATION | MB_OK);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+//----------------
+//  DisplayImage
+//----------------
+
+BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
+        BYTE **ppDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched)
+{
+    BYTE                       *pDib = *ppDib;
+    BYTE                       *pDiData = *ppDiData;
+    // BITMAPFILEHEADER        *pbmfh;
+    BITMAPINFOHEADER           *pbmih;
+    WORD                        wDIRowBytes;
+    png_color                   bkgBlack = {0, 0, 0};
+    png_color                   bkgGray  = {127, 127, 127};
+    png_color                   bkgWhite = {255, 255, 255};
+
+    // allocate memory for the Device Independant bitmap
+
+    wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;
+
+    if (pDib)
+    {
+        free (pDib);
+        pDib = NULL;
+    }
+
+    if (!(pDib = (BYTE *) malloc (sizeof(BITMAPINFOHEADER) +
+        wDIRowBytes * cyWinSize)))
+    {
+        MessageBox (hwnd, TEXT ("Error in displaying the PNG image"),
+            szProgName, MB_ICONEXCLAMATION | MB_OK);
+        *ppDib = pDib = NULL;
+        return FALSE;
+    }
+    *ppDib = pDib;
+    memset (pDib, 0, sizeof(BITMAPINFOHEADER));
+
+    // initialize the dib-structure
+
+    pbmih = (BITMAPINFOHEADER *) pDib;
+    pbmih->biSize = sizeof(BITMAPINFOHEADER);
+    pbmih->biWidth = cxWinSize;
+    pbmih->biHeight = -((long) cyWinSize);
+    pbmih->biPlanes = 1;
+    pbmih->biBitCount = 24;
+    pbmih->biCompression = 0;
+    pDiData = pDib + sizeof(BITMAPINFOHEADER);
+    *ppDiData = pDiData;
+
+    // first fill bitmap with gray and image border
+
+    InitBitmap (pDiData, cxWinSize, cyWinSize);
+
+    // then fill bitmap with image
+
+    if (pbImage)
+    {
+        FillBitmap (
+            pDiData, cxWinSize, cyWinSize,
+            pbImage, cxImgSize, cyImgSize, cImgChannels,
+            bStretched);
+    }
+
+    return TRUE;
+}
+
+//--------------
+//  InitBitmap
+//--------------
+
+BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
+{
+    BYTE *dst;
+    int x, y, col;
+
+    // initialize the background with gray
+
+    dst = pDiData;
+    for (y = 0; y < cyWinSize; y++)
+    {
+        col = 0;
+        for (x = 0; x < cxWinSize; x++)
+        {
+            // fill with GRAY
+            *dst++ = 127;
+            *dst++ = 127;
+            *dst++ = 127;
+            col += 3;
+        }
+        // rows start on 4 byte boundaries
+        while ((col % 4) != 0)
+        {
+            dst++;
+            col++;
+        }
+    }
+
+    return TRUE;
+}
+
+//--------------
+//  FillBitmap
+//--------------
+
+BOOL FillBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched)
+{
+    BYTE *pStretchedImage;
+    BYTE *pImg;
+    BYTE *src, *dst;
+    BYTE r, g, b, a;
+    const int cDIChannels = 3;
+    WORD wImgRowBytes;
+    WORD wDIRowBytes;
+    int cxNewSize, cyNewSize;
+    int cxImgPos, cyImgPos;
+    int xImg, yImg;
+    int xWin, yWin;
+    int xOld, yOld;
+    int xNew, yNew;
+
+    if (bStretched)
+    {
+        cxNewSize = cxWinSize - 2 * MARGIN;
+        cyNewSize = cyWinSize - 2 * MARGIN;
+
+        // stretch the image to it's window determined size
+
+        // the following two are the same, but the first has side-effects
+        // because of rounding
+//      if ((cyNewSize / cxNewSize) > (cyImgSize / cxImgSize))
+        if ((cyNewSize * cxImgSize) > (cyImgSize * cxNewSize))
+        {
+            cyNewSize = cxNewSize * cyImgSize / cxImgSize;
+            cxImgPos = MARGIN;
+            cyImgPos = (cyWinSize - cyNewSize) / 2;
+        }
+        else
+        {
+            cxNewSize = cyNewSize * cxImgSize / cyImgSize;
+            cyImgPos = MARGIN;
+            cxImgPos = (cxWinSize - cxNewSize) / 2;
+        }
+
+        pStretchedImage = malloc (cImgChannels * cxNewSize * cyNewSize);
+        pImg = pStretchedImage;
+
+        for (yNew = 0; yNew < cyNewSize; yNew++)
+        {
+            yOld = yNew * cyImgSize / cyNewSize;
+            for (xNew = 0; xNew < cxNewSize; xNew++)
+            {
+                xOld = xNew * cxImgSize / cxNewSize;
+
+                r = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 0);
+                g = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 1);
+                b = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 2);
+                *pImg++ = r;
+                *pImg++ = g;
+                *pImg++ = b;
+                if (cImgChannels == 4)
+                {
+                    a = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld)
+                        + 3);
+                    *pImg++ = a;
+                }
+            }
+        }
+
+        // calculate row-bytes
+
+        wImgRowBytes = cImgChannels * cxNewSize;
+        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
+
+        // copy image to screen
+
+        for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++)
+        {
+            if (yWin >= cyWinSize - cyImgPos)
+                break;
+            src = pStretchedImage + yImg * wImgRowBytes;
+            dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
+
+            for (xImg = 0, xWin = cxImgPos; xImg < cxNewSize; xImg++, xWin++)
+            {
+                if (xWin >= cxWinSize - cxImgPos)
+                    break;
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                *dst++ = b; /* note the reverse order */
+                *dst++ = g;
+                *dst++ = r;
+                if (cImgChannels == 4)
+                {
+                    a = *src++;
+                }
+            }
+        }
+
+        // free memory
+
+        if (pStretchedImage != NULL)
+        {
+            free (pStretchedImage);
+            pStretchedImage = NULL;
+        }
+
+    }
+
+    // process the image not-stretched
+
+    else
+    {
+        // calculate the central position
+
+        cxImgPos = (cxWinSize - cxImgSize) / 2;
+        cyImgPos = (cyWinSize - cyImgSize) / 2;
+
+        // check for image larger than window
+
+        if (cxImgPos < MARGIN)
+            cxImgPos = MARGIN;
+        if (cyImgPos < MARGIN)
+            cyImgPos = MARGIN;
+
+        // calculate both row-bytes
+
+        wImgRowBytes = cImgChannels * cxImgSize;
+        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
+
+        // copy image to screen
+
+        for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++)
+        {
+            if (yWin >= cyWinSize - MARGIN)
+                break;
+            src = pbImage + yImg * wImgRowBytes;
+            dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
+
+            for (xImg = 0, xWin = cxImgPos; xImg < cxImgSize; xImg++, xWin++)
+            {
+                if (xWin >= cxWinSize - MARGIN)
+                    break;
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                *dst++ = b; /* note the reverse order */
+                *dst++ = g;
+                *dst++ = r;
+                if (cImgChannels == 4)
+                {
+                    a = *src++;
+                }
+            }
+        }
+    }
+
+    return TRUE;
+}
+
+//-----------------
+//  end of source
+//-----------------

contrib/visupng/VisualPng.dsp

@@ -0,0 +1,223 @@
+# Microsoft Developer Studio Project File - Name="VisualPng" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+
+# Copyright 2000, Willem van Schaik.  For conditions of distribution and
+# use, see the copyright/license/disclaimer notice in png.h
+
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Application" 0x0101
+
+CFG=VisualPng - Win32 Debug LIB
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "VisualPng.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "VisualPng.mak" CFG="VisualPng - Win32 Debug LIB"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "VisualPng - Win32 DLL" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 Debug DLL" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 LIB" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 Debug LIB" (based on "Win32 (x86) Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "VisualPng - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "VisualPng___Win32_DLL"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_DLL"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll"
+# PROP Intermediate_Dir "dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /I "libpng" /I "zlib" /D "PNG_USE_DLL" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng2.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"libpng" /libpath:"zlib"
+# ADD LINK32 libpng2.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# Begin Special Build Tool
+OutDir=.\dll
+SOURCE="$(InputPath)"
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll;..\..\projects\msvc\win32\zlib\dll;	$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 Debug DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "VisualPng___Win32_Debug_DLL"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_Debug_DLL"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbg"
+# PROP Intermediate_Dir "dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /I "libpng" /I "zlib" /D "PNG_USE_DLL" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng2.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"libpng" /libpath:"zlib"
+# SUBTRACT BASE LINK32 /nodefaultlib
+# ADD LINK32 libpng2d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# SUBTRACT LINK32 /nodefaultlib
+# Begin Special Build Tool
+OutDir=.\dll_dbg
+SOURCE="$(InputPath)"
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbg;..\..\projects\msvc\win32\zlib\dll_dbg;	$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "VisualPng___Win32_LIB"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_LIB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "lib"
+# PROP Intermediate_Dir "lib"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT BASE CPP /YX
+# ADD CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng2.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\lib"
+# Begin Special Build Tool
+OutDir=.\lib
+SOURCE="$(InputPath)"
+PostBuild_Cmds=$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 Debug LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "VisualPng___Win32_Debug_LIB"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_Debug_LIB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "lib_dbg"
+# PROP Intermediate_Dir "lib_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng2d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# SUBTRACT BASE LINK32 /nodefaultlib
+# ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\lib_dbg"
+# SUBTRACT LINK32 /nodefaultlib
+# Begin Special Build Tool
+OutDir=.\lib_dbg
+SOURCE="$(InputPath)"
+PostBuild_Cmds=$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ENDIF 
+
+# Begin Target
+
+# Name "VisualPng - Win32 DLL"
+# Name "VisualPng - Win32 Debug DLL"
+# Name "VisualPng - Win32 LIB"
+# Name "VisualPng - Win32 Debug LIB"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=.\PngFile.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\VisualPng.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=.\cexcept.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\PngFile.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\resource.h
+# End Source File
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# Begin Source File
+
+SOURCE=.\VisualPng.ico
+# End Source File
+# Begin Source File
+
+SOURCE=.\VisualPng.rc
+# End Source File
+# End Group
+# End Target
+# End Project

contrib/visupng/VisualPng.dsw

@@ -0,0 +1,29 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "VisualPng"=.\VisualPng.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

contrib/visupng/VisualPng.rc

@@ -0,0 +1,152 @@
+//Microsoft Developer Studio generated resource script.
+//
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "afxres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (U.S.) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+#ifdef _WIN32
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+#pragma code_page(1252)
+#endif //_WIN32
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "#include ""afxres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Menu
+//
+
+VISUALPNG MENU DISCARDABLE 
+BEGIN
+    POPUP "&File"
+    BEGIN
+        MENUITEM "&Open Image...\tCtrl+O",      IDM_FILE_OPEN
+        MENUITEM "Save &As...",                 IDM_FILE_SAVE
+        MENUITEM SEPARATOR
+        MENUITEM "&Next Image\tCtrl+N",         IDM_FILE_NEXT
+        MENUITEM "Pre&vious Image\tCtrl+V",     IDM_FILE_PREVIOUS
+        MENUITEM SEPARATOR
+        MENUITEM "E&xit\tAlt+X",                IDM_FILE_EXIT
+    END
+    POPUP "&Options"
+    BEGIN
+        MENUITEM "&Stretch",                    IDM_OPTIONS_STRETCH, CHECKED
+    END
+    POPUP "&Help"
+    BEGIN
+        MENUITEM "&About",                      IDM_HELP_ABOUT
+    END
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Accelerator
+//
+
+VISUALPNG ACCELERATORS DISCARDABLE 
+BEGIN
+    "N",            IDM_FILE_NEXT,          VIRTKEY, CONTROL, NOINVERT
+    "O",            IDM_FILE_OPEN,          VIRTKEY, CONTROL, NOINVERT
+    "P",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
+    "V",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
+    "X",            IDM_FILE_EXIT,          VIRTKEY, ALT, NOINVERT
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+VISUALPNG               ICON    DISCARDABLE     "VisualPng.ico"
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Dialog
+//
+
+ABOUTBOX DIALOG DISCARDABLE  0, 0, 186, 94
+STYLE DS_MODALFRAME | WS_POPUP
+FONT 8, "MS Sans Serif"
+BEGIN
+    DEFPUSHBUTTON   "OK",IDOK,68,67,50,14
+    CTEXT           "VisualPng 1.0  -  June 2000",IDC_STATIC,49,14,88,8
+    LTEXT           "a PNG image viewer",IDC_STATIC,60,30,66,8
+    LTEXT           "(c) Willem van Schaik, 2000",IDC_STATIC,48,52,90,8
+    LTEXT           "to demonstrate the use of libpng in Visual C",
+                    IDC_STATIC,25,38,136,8
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// DESIGNINFO
+//
+
+#ifdef APSTUDIO_INVOKED
+GUIDELINES DESIGNINFO DISCARDABLE 
+BEGIN
+    "ABOUTBOX", DIALOG
+    BEGIN
+        LEFTMARGIN, 7
+        RIGHTMARGIN, 179
+        TOPMARGIN, 7
+        BOTTOMMARGIN, 87
+    END
+END
+#endif    // APSTUDIO_INVOKED
+
+#endif    // English (U.S.) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED
+

contrib/visupng/cexcept.h

@@ -0,0 +1,244 @@
+/*===
+cexcept.h 1.0.0 (2000-Jun-21-Wed)
+Adam M. Costello <amc@cs.berkeley.edu>
+
+An interface for exception-handling in ANSI C, developed jointly with
+Cosmin Truta <cosmin@cs.toronto.edu>.
+
+    Copyright (c) 2000 Adam M. Costello and Cosmin Truta.  Everyone
+    is hereby granted permission to do whatever they like with this
+    file, provided that if they modify it they take reasonable steps to
+    avoid confusing or misleading people about the authors, version,
+    and terms of use of the derived file.  The copyright holders make
+    no guarantees about the correctness of this file, and are not
+    responsible for any damage resulting from its use.
+
+If this interface is used by multiple .c files, they shouldn't include
+this header file directly.  Instead, create a wrapper header file that
+includes this header file and then invokes the define_exception_type
+macro (see below), and let your .c files include that header file.
+
+The interface consists of one type, one well-known name, and six macros.
+
+
+define_exception_type(type_name);
+
+    This macro is used like an external declaration.  It specifies
+    the type of object that gets copied from the exception thrower to
+    the exception catcher.  The type_name can be any type that can be
+    assigned to, that is, a non-constant arithmetic type, struct, union,
+    or pointer.  Examples:
+
+        define_exception_type(int);
+
+        enum exception { out_of_memory, bad_arguments, disk_full };
+        define_exception_type(enum exception);
+
+        struct exception { int code; const char *msg; };
+        define_exception_type(struct exception);
+
+
+struct exception_context;
+
+    This type may be used after the define_exception_type() macro has
+    been invoked.  A struct exception_context must be known to both
+    the thrower and the catcher.  It is expected that there be one
+    context for each thread that uses exceptions.  It would certainly
+    be dangerous for multiple threads to access the same context.
+    One thread can use multiple contexts, but that is likely to be
+    confusing and not typically useful.  The application can allocate
+    this structure in any way it pleases--automatic, static, or dynamic.
+    The application programmer should pretend not to know the structure
+    members, which are subject to change.
+
+
+struct exception_context *the_exception_context;
+
+    The Try/Catch and Throw statements (described below) implicitly
+    refer to a context, using the name the_exception_context.  It is
+    the application's responsibility to make sure that this name yields
+    the address of a mutable (non-constant) struct exception_context
+    wherever those statements are used.  Subject to that constraint, the
+    application may declare a variable of this name anywhere it likes
+    (inside a function, in a parameter list, or externally), and may
+    use whatever storage class specifiers (static, extern, etc) or type
+    qualifiers (const, volatile) it likes.  Examples:
+
+        static struct exception_context
+          * const the_exception_context = &foo;
+
+        { struct exception_context *the_exception_context = bar; ... }
+
+        int blah(struct exception_context *the_exception_context, ...);
+
+        extern struct exception_context the_exception_context[1];
+
+    The last example illustrates a trick that avoids creating a pointer
+    object separate from the structure object.
+
+    The name could even be a macro, for example:
+
+        struct exception_context ec_array[numthreads];
+        #define the_exception_context (ec_array + thread_id)
+
+    Be aware that the_exception_context is used several times by the
+    Try/Catch/Throw macros, so it shouldn't be expensive or have side
+    effects.  The expansion must be a drop-in replacement for an
+    identifier, so it's safest to put parentheses around it.
+
+
+void init_exception_context(struct exception_context *ec);
+
+    For context structures allocated statically (by an external
+    definition or using the "static" keyword), the implicit
+    initialization to all zeros is sufficient, but contexts allocated
+    by other means must be initialized using this macro before they
+    are used by a Try/Catch statement.  It does no harm to initialize
+    a context more than once (by using this macro on a statically
+    allocated context, or using this macro twice on the same context),
+    but a context must not be re-initialized after it has been used by a
+    Try/Catch statement.
+
+
+Try statement
+Catch (expression) statement
+
+    The Try/Catch/Throw macros are capitalized in order to avoid
+    confusion with the C++ keywords, which have subtly different
+    semantics.
+
+    A Try/Catch statement has a syntax similar to an if/else
+    statement, except that the parenthesized expression goes after
+    the second keyword rather than the first.  As with if/else,
+    there are two clauses, each of which may be a simple statement
+    ending with a semicolon or a brace-enclosed compound statement.
+    But whereas the else clause is optional, the Catch clause is
+    required.  The expression must be a modifiable lvalue (something
+    capable of being assigned to) of the exact same type passed to
+    define_exception_type().
+
+    If a Throw that uses the same exception context as the Try/Catch is
+    executed within the Try clause (typically within a function called
+    by the Try clause), and the exception is not caught by a nested
+    Try/Catch statement, then a copy of the exception will be assigned
+    to the expression, and control will jump to the Catch clause.  If no
+    such Throw is executed, then the assignment is not performed, and
+    the Catch clause is not executed.
+
+    Regardless of whether an exception is caught, the expression is
+    always evaluated exactly once, which is significant if it has side
+    effects, for example:
+
+        Try foo();
+        Catch (p[++i].e) { ... }
+
+    IMPORTANT: Jumping into or out of a Try clause (for example via
+    return, break, continue, goto, longjmp) is forbidden--the compiler
+    will not complain, but bad things will happen at run-time.  Jumping
+    into or out of a Catch clause is okay, and so is jumping around
+    inside a Try clause.  In many cases where one is tempted to return
+    from a Try clause, it will suffice to use Throw, and then return
+    from the Catch clause.  Another option is to set a flag variable and
+    use goto to jump to the end of the Try clause, then check the flag
+    after the Try/Catch statement.
+
+    IMPORTANT: The values of any non-volatile automatic variables
+    changed within the Try clause are undefined after an exception is
+    caught.  Therefore, variables modified inside the Try block whose
+    values are needed later outside the Try block must either use static
+    storage or be declared with the "volatile" type qualifier.
+
+
+Throw expression;
+
+    A Throw statement is very much like a return statement, except that
+    the expression is required.  Whereas return jumps back to the place
+    where the current function was called, Throw jumps back to the Catch
+    clause of the innermost enclosing Try clause.  The expression must
+    be compatible with the type passed to define_exception_type().  The
+    exception must be caught, otherwise the program may crash.
+
+    Slight limitation:  If the expression is a comma-expression it must
+    be enclosed in parentheses.
+
+
+Try statement
+Catch_anonymous statement
+
+    When the value of the exception is not needed, a Try/Catch statement
+    can use Catch_anonymous instead of Catch (expression).
+
+
+Everything below this point is for the benefit of the compiler.  The
+application programmer should pretend not to know any of it, because it
+is subject to change.
+
+===*/
+
+
+#ifndef CEXCEPT_H
+#define CEXCEPT_H
+
+
+#include <setjmp.h>
+
+#define define_exception_type(etype) \
+struct exception__state { \
+  etype *exception; \
+  jmp_buf env; \
+}
+
+struct exception_context { \
+  struct exception__state *last; \
+  int caught; \
+};
+
+#define init_exception_context(ec) ((void)((ec)->last = 0))
+
+#define Catch(e) exception__catch(&(e))
+#define Catch_anonymous exception__catch(0)
+
+#define Try \
+  { \
+    struct exception__state *exception__p, exception__s; \
+    int exception__i; \
+    exception__p = the_exception_context->last; \
+    the_exception_context->last = &exception__s; \
+    for (exception__i = 0; ; exception__i = 1) \
+      if (exception__i) { \
+        if (setjmp(exception__s.env) == 0) { \
+          if (&exception__s)
+
+#define exception__catch(e_addr) \
+          else { } \
+          the_exception_context->caught = 0; \
+        } \
+        else the_exception_context->caught = 1; \
+        the_exception_context->last = exception__p; \
+        break; \
+      } \
+      else exception__s.exception = e_addr; \
+  } \
+  if (!the_exception_context->caught) { } \
+  else
+
+/* Try ends with if(), and Catch begins and ends with else.  This     */
+/* ensures that the Try/Catch syntax is really the same as the        */
+/* if/else syntax.                                                    */
+/*                                                                    */
+/* We use &exception__s instead of 1 to appease compilers that        */
+/* warn about constant expressions inside if().  Most compilers       */
+/* should still recognize that &exception__s is never zero and avoid  */
+/* generating test code.                                              */
+/*                                                                    */
+/* We use the variable exception__i to start the loop at the bottom,  */
+/* rather than jump into the loop using a switch statement, to        */
+/* appease compilers that warn about jumping into loops.              */
+
+#define Throw \
+  for (;; longjmp(the_exception_context->last->env, 1)) \
+    if (the_exception_context->last->exception) \
+      *the_exception_context->last->exception =
+
+
+#endif /* CEXCEPT_H */

contrib/visupng/resource.h

@@ -0,0 +1,23 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Developer Studio generated include file.
+// Used by VisualPng.rc
+//
+#define IDM_FILE_OPEN                   40001
+#define IDM_FILE_SAVE                   40002
+#define IDM_FILE_NEXT                   40003
+#define IDM_FILE_PREVIOUS               40004
+#define IDM_FILE_EXIT                   40005
+#define IDM_OPTIONS_BACKGROUND          40006
+#define IDM_OPTIONS_STRETCH             40007
+#define IDM_HELP_ABOUT                  40008
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        113
+#define _APS_NEXT_COMMAND_VALUE         40009
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif

example.c

@@ -6,17 +6,28 @@
 /* This is an example of how to use libpng to read and write PNG files.
  * The file libpng.txt is much more verbose then this.  If you have not
  * read it, do so first.  This was designed to be a starting point of an
- * implementation.  This is not officially part of libpng, and therefore
- * does not require a copyright notice.
+ * implementation.  This is not officially part of libpng, is hereby placed
+ * in the public domain, and therefore does not require a copyright notice.
  *
  * This file does not currently compile, because it is missing certain
  * parts, like allocating memory to hold an image.  You will have to
  * supply these parts to get it to compile.  For an example of a minimal
- * working PNG reader/writer, see pngtest.c, included in this distribution.
+ * working PNG reader/writer, see pngtest.c, included in this distribution;
+ * see also the programs in the contrib directory.
  */
 
 #include "png.h"
 
+ /* The png_jmpbuf() macro, used in error handling, became available in
+  * libpng version 1.0.6.  If you want to be able to run your code with older
+  * versions of libpng, you must define the macro yourself (but only if it
+  * is not already defined by libpng!).
+  */
+
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
 /* Check to see if a file is a PNG file using png_sig_cmp().  png_sig_cmp()
  * returns zero if the image is a PNG and nonzero if it isn't a PNG.
  *
@@ -43,7 +54,7 @@ int check_if_png(char *file_name, FILE **fp)
    char buf[PNG_BYTES_TO_CHECK];
 
    /* Open the prospective PNG file. */
-   if ((*fp = fopen(file_name, "rb")) != NULL);
+   if ((*fp = fopen(file_name, "rb")) == NULL)
       return 0;
 
    /* Read in some of the signature bytes */
@@ -73,7 +84,7 @@ void read_png(char *file_name)  /* We need to open the file */
    FILE *fp;
 
    if ((fp = fopen(file_name, "rb")) == NULL)
-      return;
+      return (ERROR);
 #else no_open_file /* prototype 2 */
 void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 {
@@ -95,7 +106,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the memory for image information.  REQUIRED. */
@@ -104,20 +115,21 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    {
       fclose(fp);
       png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
-      return;
+      return (ERROR);
    }
 
    /* Set error handling if you are using the setjmp/longjmp method (this is
     * the normal method of doing things with libpng).  REQUIRED unless you
     * set up your own error handlers in the png_create_read_struct() earlier.
     */
-   if (setjmp(png_ptr->jmpbuf))
+
+   if (setjmp(png_jmpbuf(png_ptr)))
    {
       /* Free all of the memory associated with the png_ptr and info_ptr */
       png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
       fclose(fp);
       /* If we get here, we had a problem reading the file */
-      return;
+      return (ERROR);
    }
 
    /* One of the following I/O initialization methods is REQUIRED */
@@ -136,6 +148,19 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    /* If we have already read some of the signature */
    png_set_sig_bytes(png_ptr, sig_read);
 
+#ifdef hilevel
+   /*
+    * If you have enough memory to read in the entire image at once,
+    * and you need to specify only transforms that can be controlled
+    * with one of the PNG_TRANSFORM_* bits (this presently excludes
+    * dithering, filling, setting background, and doing gamma
+    * adjustment), then you can read the entire image (including
+    * pixels) into the info structure with this call:
+    */
+   png_read_png(png_ptr, info_ptr, png_transforms, NULL);
+#else
+   /* OK, you're doing it the hard way, with the lower-level functions */
+
    /* The call to png_read_info() gives us all of the information from the
     * PNG file before the first IDAT (image data chunk).  REQUIRED
     */
@@ -218,7 +243,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
    }
 
-   /* Tell libpng to handle the gamma conversion for you.  The second call
+   /* Tell libpng to handle the gamma conversion for you.  The final call
     * is a good guess for PC generated images, but it should be configurable
     * by the user at run time by the user.  It is strongly suggested that
     * your application support gamma correction.
@@ -227,7 +252,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    int intent;
 
    if (png_get_sRGB(png_ptr, info_ptr, &intent))
-      png_set_sRGB(png_ptr, info_ptr, intent);
+      png_set_gamma(png_ptr, screen_gamma, 0.45455);
    else
    {
       double image_gamma;
@@ -242,7 +267,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     */
    if (color_type & PNG_COLOR_MASK_COLOR)
    {
-      png_uint_32 num_palette;
+      int num_palette;
       png_colorp palette;
 
       /* This reduces the image to the application supplied palette */
@@ -257,7 +282,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       /* This reduces the image to the palette supplied in the file */
       else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
       {
-         png_color16p histogram;
+         png_uint_16p histogram;
 
          png_get_hIST(png_ptr, info_ptr, &histogram);
 
@@ -266,7 +291,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       }
    }
 
-   /* invert monocrome files to have 0 as white and 1 as black */
+   /* invert monochrome files to have 0 as white and 1 as black */
    png_set_invert_mono(png_ptr);
 
    /* If you want to shift the pixel values from the range [0,255] or
@@ -275,14 +300,15 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     */
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
    {
-      png_color8p sig_bit;
+      png_color_8p sig_bit;
 
       png_get_sBIT(png_ptr, info_ptr, &sig_bit);
       png_set_shift(png_ptr, sig_bit);
    }
 
    /* flip the RGB pixels to BGR (or RGBA to BGRA) */
-   png_set_bgr(png_ptr);
+   if (color_type & PNG_COLOR_MASK_COLOR)
+      png_set_bgr(png_ptr);
 
    /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
    png_set_swap_alpha(png_ptr);
@@ -312,7 +338,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    for (row = 0; row < height; row++)
    {
-      row_pointers[row] = malloc(png_get_rowbytes(png_ptr, info_ptr));
+      row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
+         info_ptr));
    }
 
    /* Now it's time to read the image.  One of these methods is REQUIRED */
@@ -350,6 +377,9 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
    png_read_end(png_ptr, info_ptr);
+#endif hilevel
+
+   /* At this point you have read the entire image */
 
    /* clean up after the read, and free any memory allocated - REQUIRED */
    png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
@@ -358,7 +388,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
 /* progressively read a file */
@@ -378,7 +408,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    if (*png_ptr == NULL)
    {
       *info_ptr = NULL;
-      return ERROR;
+      return (ERROR);
    }
 
    *info_ptr = png_create_info_struct(png_ptr);
@@ -386,13 +416,13 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    if (*info_ptr == NULL)
    {
       png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      return (ERROR);
    }
 
-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
    {
       png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      return (ERROR);
    }
 
    /* This one's new.  You will need to provide all three
@@ -410,18 +440,18 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
       info_callback, row_callback, end_callback);
 
-   return OK;
+   return (OK);
 }
 
 int
 process_data(png_structp *png_ptr, png_infop *info_ptr,
    png_bytep buffer, png_uint_32 length)
 {
-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
    {
       /* Free the png_ptr and info_ptr memory on error */
       png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      return (ERROR);
    }
 
    /* This one's new also.  Simply give it chunks of data as
@@ -435,7 +465,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
     * callback, if you aren't already displaying them there.
     */
    png_process_data(*png_ptr, *info_ptr, buffer, length);
-   return OK;
+   return (OK);
 }
 
 info_callback(png_structp png_ptr, png_infop info)
@@ -465,7 +495,7 @@ row_callback(png_structp png_ptr, png_bytep new_row,
  * png_progressive_combine_row() passing in the row and the
  * old row.  You can call this function for NULL rows (it will
  * just return) and for non-interlaced images (it just does the
- * memcpy for you) if it will make the code easier.  Thus, you
+ * png_memcpy for you) if it will make the code easier.  Thus, you
  * can just do this for all cases:
  */
 
@@ -499,11 +529,12 @@ void write_png(char *file_name /* , ... other image information ... */)
    FILE *fp;
    png_structp png_ptr;
    png_infop info_ptr;
+   png_colorp palette;
 
    /* open the file */
    fp = fopen(file_name, "wb");
    if (fp == NULL)
-      return;
+      return (ERROR);
 
    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
@@ -517,7 +548,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the image information data.  REQUIRED */
@@ -526,18 +557,18 @@ void write_png(char *file_name /* , ... other image information ... */)
    {
       fclose(fp);
       png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
-      return;
+      return (ERROR);
    }
 
    /* Set error handling.  REQUIRED if you aren't supplying your own
-    * error hadnling functions in the png_create_write_struct() call.
+    * error handling functions in the png_create_write_struct() call.
     */
-   if (setjmp(png_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(png_ptr)))
    {
       /* If we get here, we had a problem reading the file */
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
-      return;
+      png_destroy_write_struct(&png_ptr, &info_ptr);
+      return (ERROR);
    }
 
    /* One of the following I/O initialization functions is REQUIRED */
@@ -552,6 +583,15 @@ void write_png(char *file_name /* , ... other image information ... */)
    /* where user_io_ptr is a structure you want available to the callbacks */
 #endif no_streams /* only use one initialization method */
 
+#ifdef hilevel
+   /* This is the easy way.  Use it if you already have all the
+    * image info living info in the structure.  You could "|" many
+    * PNG_TRANSFORM flags into the png_transforms integer here.
+    */
+   png_write_png(png_ptr, info_ptr, png_transforms, NULL);
+#else
+   /* This is the hard way */
+
    /* Set the image information here.  Width and height are up to 2^31,
     * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
     * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
@@ -564,9 +604,13 @@ void write_png(char *file_name /* , ... other image information ... */)
       PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 
    /* set the palette if there is one.  REQUIRED for indexed-color images */
-   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
+             * sizeof (png_color));
    /* ... set palette colors ... */
-   png_set_PLTE(png_ptr, info_ptr, palette, 256);
+   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
+   /* You must not free palette here, because png_set_PLTE only makes a link to
+      the palette that you malloced.  Wait until you are about to destroy
+      the png structure. */
 
    /* optional significant bit chunk */
    /* if we are dealing with a grayscale image then */
@@ -595,10 +639,15 @@ void write_png(char *file_name /* , ... other image information ... */)
    text_ptr[2].key = "Description";
    text_ptr[2].text = "<long text>";
    text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
+#ifdef PNG_iTXt_SUPPORTED
+   text_ptr[0].lang = NULL;
+   text_ptr[1].lang = NULL;
+   text_ptr[2].lang = NULL;
+#endif
    png_set_text(png_ptr, info_ptr, text_ptr, 3);
 
    /* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
-   /* note that if sRGB is present the cHRM chunk must be ignored
+   /* note that if sRGB is present the gAMA and cHRM chunks must be ignored
     * on read and must be written in accordance with the sRGB profile */
 
    /* Write the file header information.  REQUIRED */
@@ -610,6 +659,9 @@ void write_png(char *file_name /* , ... other image information ... */)
     *   png_write_info_before_PLTE(write_ptr, write_info_ptr);
     *   write_my_chunk();
     *   png_write_info(png_ptr, info_ptr);
+    *
+    * However, given the level of known- and unknown-chunk support in 1.1.0
+    * and up, this should no longer be necessary.
     */
 
    /* Once we write out the header, the compression type on the text
@@ -622,7 +674,7 @@ void write_png(char *file_name /* , ... other image information ... */)
     * all optional.  Only call them if you want them.
     */
 
-   /* invert monocrome pixels */
+   /* invert monochrome pixels */
    png_set_invert_mono(png_ptr);
 
    /* Shift the pixels up to a legal bit depth and fill in
@@ -661,10 +713,10 @@ void write_png(char *file_name /* , ... other image information ... */)
     * use the first method if you aren't handling interlacing yourself.
     */
    png_uint_32 k, height, width;
-   png_byte image[height][width];
+   png_byte image[height][width*bytes_per_pixel];
    png_bytep row_pointers[height];
    for (k = 0; k < height; k++)
-     row_pointers[k] = image + k*width;
+     row_pointers[k] = image + k*width*bytes_per_pixel;
 
    /* One of the following output methods is REQUIRED */
 #ifdef entire /* write out the entire image data in one call */
@@ -690,25 +742,37 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif no_entire /* use only one output method */
 
    /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.
+    * as well.  Shouldn't be necessary in 1.1.0 and up as all the public
+    * chunks are supported and you can use png_set_unknown_chunks() to
+    * register unknown chunks into the info structure to be written out.
     */
 
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
+#endif hilevel
 
-   /* if you malloced the palette, free it here */
-   free(info_ptr->palette);
+   /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
+      as recommended in versions 1.0.5m and earlier of this example; if
+      libpng mallocs info_ptr->palette, libpng will free it).  If you
+      allocated it with malloc() instead of png_malloc(), use free() instead
+      of png_free(). */
+   png_free(png_ptr, palette);
+   palette=NULL;
 
-   /* if you allocated any text comments, free them here */
+   /* Similarly, if you png_malloced any data that you passed in with
+      png_set_something(), such as a hist or trans array, free it here,
+      when you can be sure that libpng is through with it. */
+   png_free(png_ptr, trans);
+   trans=NULL;
 
    /* clean up after the write, and free any memory allocated */
-   png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+   png_destroy_write_struct(&png_ptr, &info_ptr);
 
    /* close the file */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
 #endif /* if 0 */

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 November 29, 1999
+.TH LIBPNGPF 3 "May 14, 2001"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29, 1999
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.12beta1
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -55,6 +55,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBpng_charp png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
 
 \fI\fB
@@ -187,6 +191,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
 \fI\fB
@@ -211,6 +219,14 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_handle_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_iTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_handle_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
 \fI\fB
@@ -231,6 +247,14 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_handle_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_handle_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
 \fI\fB
@@ -359,10 +383,6 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
-\fBvoid png_read_init (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
 \fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
 
 \fI\fB
@@ -399,6 +419,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_write_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
 
 \fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
@@ -417,11 +441,15 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
 
 \fI\fB
 
-\fBvoid png_write_init (png_structp \fIpng_ptr\fP\fB);\fP
+\fBvoid png_write_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
 
 \fI\fB
 
@@ -437,6 +465,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_write_iTXt (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcompression\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fIlang\fP\fB, png_charp \fP\fItranslated_key\fP\fB, png_charp \fItext)\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_write_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_offset\fP\fB, png_uint_32 \fP\fIy_offset\fP\fB, int \fIunit_type\fP\fB);\fP
 
 \fI\fB
@@ -457,6 +489,14 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_write_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sCAL_s (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, png_charp \fP\fIwidth\fP\fB, png_charp \fIheight\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_write_sig (png_structp \fIpng_ptr\fP\fB);\fP
 
 \fI\fB
@@ -465,6 +505,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5d - November 29
 
 \fI\fB
 
+\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
 
 \fI\fB

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "November 29, 1999"
+.TH PNG 5 "May 14, 2001"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -20,10 +20,12 @@ platforms.
 .SH "SEE ALSO"
 .IR libpng(3), zlib(3), deflate(5), and zlib(5)
 .LP
-PNG 1.1 specification, January 1999:
+PNG 1.2 specification, July 1999:
 .IP
 .br
-http://www.cdrom.com/pub/png
+http://www.libpng.org/pub/png
+.br
+or ftp://ftp.uu.net/graphics/png/documents
 .LP
 PNG 1.0 specification, October 1996:
 .IP

png.c

@@ -1,29 +1,31 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.5d - November 29, 1999
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- * 
+ * libpng version 1.0.12beta1 - May 14, 2001
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
  */
 
 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
 #include "png.h"
 
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_0_12beta1 Your_png_h_is_not_version_1_0_12beta1;
+
 /* Version information for C files.  This had better match the version
- * string defined in png.h.
- */
+ * string defined in png.h.  */
 
 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-char png_libpng_ver[12] = "1.0.5d";
+const char png_libpng_ver[18] = "1.0.12beta1";
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
-png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
- 
+const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+
 /* Invoke global declarations for constant strings for known chunk types */
 PNG_IHDR;
 PNG_IDAT;
@@ -33,10 +35,14 @@ PNG_bKGD;
 PNG_cHRM;
 PNG_gAMA;
 PNG_hIST;
+PNG_iCCP;
+PNG_iTXt;
 PNG_oFFs;
 PNG_pCAL;
+PNG_sCAL;
 PNG_pHYs;
 PNG_sBIT;
+PNG_sPLT;
 PNG_sRGB;
 PNG_tEXt;
 PNG_tIME;
@@ -46,32 +52,33 @@ PNG_zTXt;
 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
 /* start of interlace block */
-int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
 /* offset to next interlace block */
-int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
 /* start of interlace block in the y direction */
-int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
 /* offset to next interlace block in the y direction */
-int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
-/* Width of interlace block.  This is not currently used - if you need
- * it, uncomment it here and in png.h
-int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-*/
+/* width of interlace block (used in assembler routines only) */
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+#endif
 
 /* Height of interlace block.  This is not currently used - if you need
  * it, uncomment it here and in png.h
-int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
 */
 
 /* Mask to determine which pixels are valid in a pass */
-int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 
 /* Mask to determine which pixels to overwrite while displaying */
-int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+const int FARDATA png_pass_dsp_mask[]
+   = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 
 #endif
 
@@ -81,7 +88,7 @@ int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
  * or write any of the magic bytes before it starts on the IHDR.
  */
 
-void
+void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
    png_debug(1, "in png_set_sig_bytes\n");
@@ -99,7 +106,7 @@ png_set_sig_bytes(png_structp png_ptr, int num_bytes)
  * respectively, to be less than, to match, or be greater than the correct
  * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
  */
-int
+int PNGAPI
 png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
 {
    png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -121,19 +128,20 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
  * to check a partial signature.  This function might be removed in the
  * future - use png_sig_cmp().  Returns true (nonzero) if the file is a PNG.
  */
-int
+int PNGAPI
 png_check_sig(png_bytep sig, int num)
 {
   return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
 }
 
-/* Function to allocate memory for zlib. */
-voidpf
+/* Function to allocate memory for zlib and clear it to 0. */
+voidpf /* PRIVATE */
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
    png_uint_32 num_bytes = (png_uint_32)items * size;
    png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
 
+#ifndef PNG_NO_ZALLOC_ZERO
    if (num_bytes > (png_uint_32)0x8000L)
    {
       png_memset(ptr, 0, (png_size_t)0x8000L);
@@ -144,11 +152,12 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    {
       png_memset(ptr, 0, (png_size_t)num_bytes);
    }
+#endif
    return ((voidpf)ptr);
 }
 
 /* function to free memory for zlib */
-void
+void /* PRIVATE */
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
    png_free((png_structp)png_ptr, (png_voidp)ptr);
@@ -157,7 +166,7 @@ png_zfree(voidpf png_ptr, voidpf ptr)
 /* Reset the CRC variable to 32 bits of 1's.  Care must be taken
  * in case CRC is > 32 bits to leave the top bits 0.
  */
-void
+void /* PRIVATE */
 png_reset_crc(png_structp png_ptr)
 {
    png_ptr->crc = crc32(0, Z_NULL, 0);
@@ -168,7 +177,7 @@ png_reset_crc(png_structp png_ptr)
  * also check that this data will actually be used before going to the
  * trouble of calculating it.
  */
-void
+void /* PRIVATE */
 png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
 {
    int need_crc = 1;
@@ -195,7 +204,7 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
  * and png_info_init() so that applications that want to use a shared
  * libpng don't have to be recompiled if png_info changes size.
  */
-png_infop
+png_infop PNGAPI
 png_create_info_struct(png_structp png_ptr)
 {
    png_infop info_ptr;
@@ -204,12 +213,12 @@ png_create_info_struct(png_structp png_ptr)
    if(png_ptr == NULL) return (NULL);
 #ifdef PNG_USER_MEM_SUPPORTED
    if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
-      png_ptr->malloc_fn)) != NULL)
+      png_ptr->malloc_fn, png_ptr->mem_ptr)) != NULL)
 #else
    if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
 #endif
    {
-      png_info_init(info_ptr);
+      png_info_init_3(&info_ptr, sizeof(png_info));
    }
 
    return (info_ptr);
@@ -220,7 +229,7 @@ png_create_info_struct(png_structp png_ptr)
  * png_destroy_write_struct() to free an info struct, but this may be
  * useful for some applications.
  */
-void
+void PNGAPI
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
    png_infop info_ptr = NULL;
@@ -234,7 +243,8 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
       png_info_destroy(png_ptr, info_ptr);
 
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn);
+      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+          png_ptr->mem_ptr);
 #else
       png_destroy_struct((png_voidp)info_ptr);
 #endif
@@ -246,62 +256,314 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
  * and applications using it are urged to use png_create_info_struct()
  * instead.
  */
-void
+#undef png_info_init
+void PNGAPI
 png_info_init(png_infop info_ptr)
 {
-   png_debug(1, "in png_info_init\n");
+   /* We only come here via pre-1.0.12-compiled applications */
+   png_info_init_3(&info_ptr, 0);
+}
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+   png_infop info_ptr = *ptr_ptr;
+
+   png_debug(1, "in png_info_init_3\n");
+
+   if(sizeof(png_info) > png_info_struct_size)
+     {
+       png_destroy_struct(info_ptr);
+       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+       *ptr_ptr = info_ptr;
+     }
+
    /* set everything to 0 */
    png_memset(info_ptr, 0, sizeof (png_info));
 }
 
+#ifdef PNG_FREE_ME_SUPPORTED
+void PNGAPI
+png_data_freer(png_structp png_ptr, png_infop info_ptr,
+   int freer, png_uint_32 mask)
+{
+   png_debug(1, "in png_data_freer\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   if(freer == PNG_DESTROY_WILL_FREE_DATA)
+      info_ptr->free_me |= mask;
+   else if(freer == PNG_USER_WILL_FREE_DATA)
+      info_ptr->free_me &= ~mask;
+   else
+      png_warning(png_ptr,
+         "Unknown freer parameter in png_data_freer.");
+}
+#endif
+
+void PNGAPI
+png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
+   int num)
+{
+   png_debug(1, "in png_free_data\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+#if defined(PNG_TEXT_SUPPORTED)
+/* free text item num or (if num == -1) all text items */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_TEXT)
+#endif
+{
+   if (num != -1)
+   {
+     if (info_ptr->text && info_ptr->text[num].key)
+     {
+         png_free(png_ptr, info_ptr->text[num].key);
+         info_ptr->text[num].key = NULL;
+     }
+   }
+   else
+   {
+       int i;
+       for (i = 0; i < info_ptr->num_text; i++)
+           png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+       png_free(png_ptr, info_ptr->text);
+       info_ptr->text = NULL;
+       info_ptr->num_text=0;
+   }
+}
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED)
+/* free any tRNS entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+#endif
+{
+    png_free(png_ptr, info_ptr->trans);
+    info_ptr->valid &= ~PNG_INFO_tRNS;
+    info_ptr->trans = NULL;
+}
+#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+/* free any sCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_SCAL)
+#endif
+{
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+    png_free(png_ptr, info_ptr->scal_s_width);
+    png_free(png_ptr, info_ptr->scal_s_height);
+    info_ptr->scal_s_width = NULL;
+    info_ptr->scal_s_height = NULL;
+#endif
+    info_ptr->valid &= ~PNG_INFO_sCAL;
+}
+#endif
+
+#if defined(PNG_pCAL_SUPPORTED)
+/* free any pCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_PCAL)
+#endif
+{
+    png_free(png_ptr, info_ptr->pcal_purpose);
+    png_free(png_ptr, info_ptr->pcal_units);
+    info_ptr->pcal_purpose = NULL;
+    info_ptr->pcal_units = NULL;
+    if (info_ptr->pcal_params != NULL)
+    {
+        int i;
+        for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+        {
+          png_free(png_ptr, info_ptr->pcal_params[i]);
+          info_ptr->pcal_params[i]=NULL;
+        }
+        png_free(png_ptr, info_ptr->pcal_params);
+        info_ptr->pcal_params = NULL;
+    }
+    info_ptr->valid &= ~PNG_INFO_pCAL;
+}
+#endif
+
+#if defined(PNG_iCCP_SUPPORTED)
+/* free any iCCP entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_ICCP)
+#endif
+{
+    png_free(png_ptr, info_ptr->iccp_name);
+    png_free(png_ptr, info_ptr->iccp_profile);
+    info_ptr->iccp_name = NULL;
+    info_ptr->iccp_profile = NULL;
+    info_ptr->valid &= ~PNG_INFO_iCCP;
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+/* free a given sPLT entry, or (if num == -1) all sPLT entries */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_SPLT)
+#endif
+{
+   if (num != -1)
+   {
+      if(info_ptr->splt_palettes)
+      {
+          png_free(png_ptr, info_ptr->splt_palettes[num].name);
+          png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+          info_ptr->splt_palettes[num].name = NULL;
+          info_ptr->splt_palettes[num].entries = NULL;
+      }
+   }
+   else
+   {
+       if(info_ptr->splt_palettes_num)
+       {
+         int i;
+         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+            png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+         png_free(png_ptr, info_ptr->splt_palettes);
+         info_ptr->splt_palettes = NULL;
+         info_ptr->splt_palettes_num = 0;
+       }
+       info_ptr->valid &= ~PNG_INFO_sPLT;
+   }
+}
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_UNKN)
+#endif
+{
+   if (num != -1)
+   {
+       if(info_ptr->unknown_chunks)
+       {
+          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+          info_ptr->unknown_chunks[num].data = NULL;
+       }
+   }
+   else
+   {
+       int i;
+
+       if(info_ptr->unknown_chunks_num)
+       {
+         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+
+         png_free(png_ptr, info_ptr->unknown_chunks);
+         info_ptr->unknown_chunks = NULL;
+         info_ptr->unknown_chunks_num = 0;
+       }
+   }
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+/* free any hIST entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
+#endif
+{
+    png_free(png_ptr, info_ptr->hist);
+    info_ptr->hist = NULL;
+    info_ptr->valid &= ~PNG_INFO_hIST;
+}
+#endif
+
+/* free any PLTE entry that was internally allocated */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
+#endif
+{
+    png_zfree(png_ptr, info_ptr->palette);
+    info_ptr->palette = NULL;
+    info_ptr->valid &= ~PNG_INFO_PLTE;
+    info_ptr->num_palette = 0;
+}
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* free any image bits attached to the info structure */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_ROWS)
+#endif
+{
+    if(info_ptr->row_pointers)
+    {
+       int row;
+       for (row = 0; row < (int)info_ptr->height; row++)
+       {
+          png_free(png_ptr, info_ptr->row_pointers[row]);
+          info_ptr->row_pointers[row]=NULL;
+       }
+       png_free(png_ptr, info_ptr->row_pointers);
+       info_ptr->row_pointers=NULL;
+    }
+    info_ptr->valid &= ~PNG_INFO_IDAT;
+}
+#endif
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   if(num == -1)
+     info_ptr->free_me &= ~mask;
+   else
+     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+#endif
+}
+
 /* This is an internal routine to free any memory that the info struct is
  * pointing to before re-using it or freeing the struct itself.  Recall
  * that png_free() checks for NULL pointers for us.
  */
-void
+void /* PRIVATE */
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
    png_debug(1, "in png_info_destroy\n");
-   if (info_ptr->text != NULL)
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+   if (png_ptr->num_chunk_list)
    {
-      int i;
-      for (i = 0; i < info_ptr->num_text; i++)
-      {
-         if(info_ptr->text[i].key != NULL)
-         {
-           png_free(png_ptr, info_ptr->text[i].key);
-           info_ptr->text[i].key = NULL;
-         }
-      }
-      png_free(png_ptr, info_ptr->text);
-      info_ptr->text = NULL;
-   }
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-   png_free(png_ptr, info_ptr->pcal_purpose);
-   png_free(png_ptr, info_ptr->pcal_units);
-   if (info_ptr->pcal_params != NULL)
-   {
-      int i;
-      for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-      {
-         png_free(png_ptr, info_ptr->pcal_params[i]);
-         info_ptr->pcal_params[i]=NULL;
-      }
-      png_free(png_ptr, info_ptr->pcal_params);
-      info_ptr->pcal_params = NULL;
+       png_free(png_ptr, png_ptr->chunk_list);
+       png_ptr->chunk_list=NULL;
+       png_ptr->num_chunk_list=0;
    }
 #endif
 
-   png_info_init(info_ptr);
+   png_info_init_3(&info_ptr, sizeof(png_info));
 }
 
 /* This function returns a pointer to the io_ptr associated with the user
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy() or png_read_destroy() are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
    return (png_ptr->io_ptr);
@@ -310,10 +572,12 @@ png_get_io_ptr(png_structp png_ptr)
 #if !defined(PNG_NO_STDIO)
 /* Initialize the default input/output functions for the PNG file.  If you
  * use your own read or write routines, you can call either png_set_read_fn()
- * or png_set_write_fn() instead of png_init_io().
+ * or png_set_write_fn() instead of png_init_io().  If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
  */
-void
-png_init_io(png_structp png_ptr, FILE *fp)
+void PNGAPI
+png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
    png_debug(1, "in png_init_io\n");
    png_ptr->io_ptr = (png_voidp)fp;
@@ -324,7 +588,7 @@ png_init_io(png_structp png_ptr, FILE *fp)
 /* Convert the supplied time into an RFC 1123 string suitable for use in
  * a "Creation Time" or other text-based time string.
  */
-png_charp
+png_charp PNGAPI
 png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 {
    static PNG_CONST char short_months[12][4] =
@@ -337,45 +601,56 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
          sizeof(char)));
    }
 
+#if defined(_WIN32_WCE)
+   {
+      wchar_t time_buf[29];
+      wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+        ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
+      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
+          NULL, NULL);
+   }
+#else
 #ifdef USE_FAR_KEYWORD
    {
       char near_time_buf[29];
       sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 32, short_months[(ptime->month - 1) % 12],
-               ptime->year, ptime->hour % 24, ptime->minute % 60,
-               ptime->second % 61);
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+          ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
       png_memcpy(png_ptr->time_buffer, near_time_buf,
-      29*sizeof(char));
+          29*sizeof(char));
    }
 #else
    sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 32, short_months[(ptime->month - 1) % 12],
-               ptime->year, ptime->hour % 24, ptime->minute % 60,
-               ptime->second % 61);
+       ptime->day % 32, short_months[(ptime->month - 1) % 12],
+       ptime->year, ptime->hour % 24, ptime->minute % 60,
+       ptime->second % 61);
 #endif
+#endif /* _WIN32_WCE */
    return ((png_charp)png_ptr->time_buffer);
 }
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
 
+#if 0
 /* Signature string for a PNG file. */
-png_bytep
-png_sig_bytes(png_structp png_ptr)
+png_bytep PNGAPI
+png_sig_bytes(void)
 {
-   const png_byte png_sig_numbers[9] = {137, 80, 78, 71, 13, 10, 26, 10, 0};
-   if (png_ptr == NULL) /* silence compiler warning */
-     return ((png_bytep) strdup((png_const_charp)png_sig_numbers));
-   return ((png_bytep) strdup((png_const_charp)png_sig_numbers));
+   return ((png_bytep)"\211\120\116\107\015\012\032\012");
 }
+#endif
 
-png_charp
+png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ("\n libpng version 1.0.5d - November 29, 1999\n\
-   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
+   return ((png_charp) "\n libpng version 1.0.12beta1 - May 14, 2001\n\
+   Copyright (c) 1998-2001 Glenn Randers-Pehrson\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
-   Copyright (c) 1998, 1999 Glenn Randers-Pehrson\n");
-   return ("");
+   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
+   return ((png_charp) "");
 }
 
 /* The following return the library version as a short string in the
@@ -384,38 +659,71 @@ png_get_copyright(png_structp png_ptr)
  * in png.h.
  */
 
-png_charp
+png_charp PNGAPI
 png_get_libpng_ver(png_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
    if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return("1.0.5d");
-   return("1.0.5d");
+      return((png_charp) "1.0.12beta1");
+   return((png_charp) "1.0.12beta1");
 }
 
-png_charp
+png_charp PNGAPI
 png_get_header_ver(png_structp png_ptr)
 {
    /* Version of *.h files used when building libpng */
    if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return(PNG_LIBPNG_VER_STRING);
-   return(PNG_LIBPNG_VER_STRING);
+      return((png_charp) PNG_LIBPNG_VER_STRING);
+   return((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
-png_charp
+png_charp PNGAPI
 png_get_header_version(png_structp png_ptr)
 {
    /* Returns longer string containing both version and date */
    if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return(PNG_HEADER_VERSION_STRING);
-   return(PNG_HEADER_VERSION_STRING);
+      return((png_charp) PNG_HEADER_VERSION_STRING);
+   return((png_charp) PNG_HEADER_VERSION_STRING);
 }
 
-/* Generate a compiler error if there is an old png.h in the search path. */
-void
-png_check_version
-   (version_1_0_5d png_h_is_not_version_1_0_5d)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+int /* PRIVATE */
+png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 {
-   if(png_h_is_not_version_1_0_5d == NULL)
-     return;
+   /* check chunk_name and return "keep" value if it's on the list, else 0 */
+   int i;
+   png_bytep p;
+   if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+      return 0;
+   p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
+   for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+      if (!png_memcmp(chunk_name, p, 4))
+        return ((int)*(p+4));
+   return 0;
 }
+#endif
+
+/* This function, added to libpng-1.0.6g, is untested. */
+int PNGAPI
+png_reset_zstream(png_structp png_ptr)
+{
+   return (inflateReset(&png_ptr->zstream));
+}
+
+/* This function was added to libpng-1.0.7 */
+png_uint_32 PNGAPI
+png_access_version_number(void)
+{
+   /* Version of *.c files used when building libpng */
+   return((png_uint_32) 10012L);
+}
+
+/* this function was added to libpng 1.2.0 */
+#if !defined(PNG_USE_PNGGCCRD) && \
+    !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
+int PNGAPI
+png_mmx_support(void)
+{
+    return -1;
+}
+#endif

pngasmrd.h

@@ -1,32 +1,11 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1999 Glenn Randers-Pehrson
+ * Copyright (c) 2001 Glenn Randers-Pehrson
  *
  */
 
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-
-/* Set this in the makefile for VC++ on Pentium, not in pngconf.h */
-#ifdef PNG_USE_PNGVCRD
-/* Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
- * MMX will be detected at run time and used if present.
+/* This file is obsolete in libpng-1.0.9 and later; its contents now appear
+ * at the end of pngconf.h.
  */
-#define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-#endif
-
-/* Set this in the makefile for gcc on Pentium, not in pngconf.h */
-#ifdef PNG_USE_PNGGCCRD
-/* Platform must be Pentium.  Makefile must assemble and load pnggccrd.c
- * (not available in libpng 1.0.5d).
- * MMX will be detected at run time and used if present.
- */
-#define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-#endif
-
-#endif

pngerror.c

@@ -1,11 +1,11 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file provides a location for all error handling.  Users who
  * need special error handling are expected to write replacement functions
@@ -16,9 +16,11 @@
 #define PNG_INTERNAL
 #include "png.h"
 
-static void png_default_error PNGARG((png_structp png_ptr,
+static void /* PRIVATE */
+png_default_error PNGARG((png_structp png_ptr,
                                       png_const_charp message));
-static void png_default_warning PNGARG((png_structp png_ptr,
+static void /* PRIVATE */
+png_default_warning PNGARG((png_structp png_ptr,
                                         png_const_charp message));
 
 /* This function is called whenever there is a fatal error.  This function
@@ -26,9 +28,41 @@ static void png_default_warning PNGARG((png_structp png_ptr,
  * you should supply a replacement error function and use png_set_error_fn()
  * to replace the error function at run-time.
  */
-void
+void PNGAPI
 png_error(png_structp png_ptr, png_const_charp message)
 {
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   char msg[16];
+   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+   {
+     int offset = 0;
+     if (*message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(message+offset) == ' ')
+                break;
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            int i;
+            for (i=0; i<offset-1; i++)
+               msg[i]=message[i+1];
+            msg[i]='\0';
+            message=msg;
+         }
+         else
+            message+=offset;
+     }
+     else
+     {
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            msg[0]='0';        
+            msg[1]='\0';
+            message=msg;
+         }
+     }
+   }
+#endif
    if (png_ptr->error_fn != NULL)
       (*(png_ptr->error_fn))(png_ptr, message);
 
@@ -42,13 +76,25 @@ png_error(png_structp png_ptr, png_const_charp message)
  * you should supply a replacement warning function and use
  * png_set_error_fn() to replace the warning function at run-time.
  */
-void
+void PNGAPI
 png_warning(png_structp png_ptr, png_const_charp message)
 {
+     int offset = 0;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
+   {
+     if (*message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(message+offset) == ' ')
+                break;
+     }
+   }
    if (png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_ptr, message);
+      (*(png_ptr->warning_fn))(png_ptr, (png_const_charp)(message+offset));
    else
-      png_default_warning(png_ptr, message);
+      png_default_warning(png_ptr, (png_const_charp)(message+offset));
 }
 
 /* These utilities are used internally to build an error message that relates
@@ -59,29 +105,35 @@ png_warning(png_structp png_ptr, png_const_charp message)
  */
 #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
 static PNG_CONST char png_digit[16] = {
-   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
-};
+   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
+   'F' };
 
-static void
-png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message)
+static void /* PRIVATE */
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+   message)
 {
    int iout = 0, iin = 0;
 
-   while (iin < 4) {
+   while (iin < 4)
+   {
       int c = png_ptr->chunk_name[iin++];
-      if (isnonalpha(c)) {
+      if (isnonalpha(c))
+      {
          buffer[iout++] = '[';
          buffer[iout++] = png_digit[(c & 0xf0) >> 4];
-         buffer[iout++] = png_digit[c & 0xf];
+         buffer[iout++] = png_digit[c & 0x0f];
          buffer[iout++] = ']';
-      } else {
+      }
+      else
+      {
          buffer[iout++] = (png_byte)c;
       }
    }
 
    if (message == NULL)
       buffer[iout] = 0;
-   else {
+   else
+   {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
       png_memcpy(buffer+iout, message, 64);
@@ -89,18 +141,18 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
    }
 }
 
-void
+void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_error(png_ptr, msg);
 }
 
-void
+void PNGAPI
 png_chunk_warning(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_warning(png_ptr, msg);
 }
@@ -110,21 +162,51 @@ png_chunk_warning(png_structp png_ptr, png_const_charp message)
  * function is used by default, or if the program supplies NULL for the
  * error function pointer in png_set_error_fn().
  */
-static void
+static void /* PRIVATE */
 png_default_error(png_structp png_ptr, png_const_charp message)
 {
 #ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*message == '#')
+   {
+     int offset;
+     char error_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+         error_number[offset] = *(message+offset+1);
+         if (*(message+offset) == ' ')
+             break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       error_number[offset-1]='\0';
+       fprintf(stderr, "libpng error no. %s: %s\n", error_number, message+offset);
+     }
+     else
+       fprintf(stderr, "libpng error: %s, offset=%d\n", message,offset);
+   }
+   else
+#endif
    fprintf(stderr, "libpng error: %s\n", message);
+#else
+   if (message)
+     /* make compiler happy */ ;
 #endif
 
-#ifdef USE_FAR_KEYWORD
+#ifdef PNG_SETJMP_SUPPORTED
+#  ifdef USE_FAR_KEYWORD
    {
       jmp_buf jmpbuf;
       png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
       longjmp(jmpbuf, 1);
    }
-#else
+#  else
    longjmp(png_ptr->jmpbuf, 1);
+# endif
+#else
+   if (png_ptr)
+     /* make compiler happy */ ;
+   PNG_ABORT();
 #endif
 }
 
@@ -133,13 +215,38 @@ png_default_error(png_structp png_ptr, png_const_charp message)
  * here if you don't want them to.  In the default configuration, png_ptr is
  * not used, but it is passed in case it may be useful.
  */
-static void
+static void /* PRIVATE */
 png_default_warning(png_structp png_ptr, png_const_charp message)
 {
 #ifndef PNG_NO_CONSOLE_IO
-   fprintf(stderr, "libpng warning: %s\n", message);
+#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*message == '#')
+   {
+     int offset;
+     char warning_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+        warning_number[offset]=*(message+offset+1);
+        if (*(message+offset) == ' ')
+            break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       warning_number[offset-1]='\0';
+       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
+          message+offset);
+     }
+     else
+       fprintf(stderr, "libpng warning: %s\n", message);
+   }
+   else
+#  endif
+     fprintf(stderr, "libpng warning: %s\n", message);
+#else
+   if (message)
+     /* appease compiler */ ;
 #endif
-   if (png_ptr == NULL)
+   if (png_ptr)
       return;
 }
 
@@ -148,7 +255,7 @@ png_default_warning(png_structp png_ptr, png_const_charp message)
  * return to the calling routine or serious problems will occur.  The return
  * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
  */
-void
+void PNGAPI
 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warning_fn)
 {
@@ -162,11 +269,22 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy and png_read_destroy are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_error_ptr(png_structp png_ptr)
 {
    return ((png_voidp)png_ptr->error_ptr);
 }
 
 
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+   if(png_ptr != NULL)
+   {
+     png_ptr->flags &=
+       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+   }
+}
+#endif
 

pngget.c

@@ -1,17 +1,17 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
 
 #define PNG_INTERNAL
 #include "png.h"
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -20,7 +20,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
       return(0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -29,9 +29,20 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
       return(0);
 }
 
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+png_bytepp PNGAPI
+png_get_rows(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+      return(info_ptr->row_pointers);
+   else
+      return(0);
+}
+#endif
+
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* easy access to info, added in libpng-0.99 */
-png_uint_32
+png_uint_32 PNGAPI
 png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -41,7 +52,7 @@ png_get_image_width(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -51,7 +62,7 @@ png_get_image_height(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -61,7 +72,7 @@ png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -71,7 +82,7 @@ png_get_color_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -81,7 +92,7 @@ png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -91,7 +102,7 @@ png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -101,43 +112,48 @@ png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->y_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
@@ -145,137 +161,150 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-float
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+float PNGAPI
 png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
    {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit == 0)
          return ((float)0.0);
       else
-         return ((float)info_ptr->y_pixels_per_unit
-            /(float)info_ptr->x_pixels_per_unit);
+         return ((float)((float)info_ptr->y_pixels_per_unit
+            /(float)info_ptr->x_pixels_per_unit));
    }
-   else
+#else
+   return (0.0);
 #endif
-      return ((float)0.0);
+   return ((float)0.0);
 }
+#endif
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-#ifdef PNG_INCH_CONVERSIONS
-png_uint_32
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-float
+float PNGAPI
 png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
    return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937);
 }
 
-float
+float PNGAPI
 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
    return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937);
 }
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
-png_uint_32
+#if defined(PNG_pHYs_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
 
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function\n", "pHYs");
       if (res_x != NULL)
@@ -292,23 +321,23 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
       {
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
-         if(unit_type == 1)
+         if(*unit_type == 1)
          {
-            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
-            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
+            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
+            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
          }
       }
    }
    return (retval);
 }
-#endif /* PNG_READ_pHYs_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS */
+#endif /* PNG_pHYs_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
 
 /* png_get_channels really belongs in here, too, but it's been around longer */
 
 #endif  /* PNG_EASY_ACCESS_SUPPORTED */
 
-png_byte
+png_byte PNGAPI
 png_get_channels(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -317,7 +346,7 @@ png_get_channels(png_structp png_ptr, png_infop info_ptr)
       return (0);
 }
 
-png_bytep
+png_bytep PNGAPI
 png_get_signature(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -326,8 +355,8 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)
       return (NULL);
 }
 
-#if defined(PNG_READ_bKGD_SUPPORTED)
-png_uint_32
+#if defined(PNG_bKGD_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
    png_color_16p *background)
 {
@@ -342,8 +371,9 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED)
-png_uint_32
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
 png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
    double *white_x, double *white_y, double *red_x, double *red_y,
    double *green_x, double *green_y, double *blue_x, double *blue_y)
@@ -372,9 +402,42 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
    return (0);
 }
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+   png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
+   png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
+   png_fixed_point *blue_x, png_fixed_point *blue_y)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+   {
+      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      if (white_x != NULL)
+         *white_x = info_ptr->int_x_white;
+      if (white_y != NULL)
+         *white_y = info_ptr->int_y_white;
+      if (red_x != NULL)
+         *red_x = info_ptr->int_x_red;
+      if (red_y != NULL)
+         *red_y = info_ptr->int_y_red;
+      if (green_x != NULL)
+         *green_x = info_ptr->int_x_green;
+      if (green_y != NULL)
+         *green_y = info_ptr->int_y_green;
+      if (blue_x != NULL)
+         *blue_x = info_ptr->int_x_blue;
+      if (blue_y != NULL)
+         *blue_y = info_ptr->int_y_blue;
+      return (PNG_INFO_cHRM);
+   }
+   return (0);
+}
+#endif
+#endif
 
-#if defined(PNG_READ_gAMA_SUPPORTED)
-png_uint_32
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
 png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
@@ -387,9 +450,25 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
    return (0);
 }
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+    png_fixed_point *int_file_gamma)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+      && int_file_gamma != NULL)
+   {
+      png_debug1(1, "in %s retrieval function\n", "gAMA");
+      *int_file_gamma = info_ptr->int_gamma;
+      return (PNG_INFO_gAMA);
+   }
+   return (0);
+}
+#endif
+#endif
 
-#if defined(PNG_READ_sRGB_SUPPORTED)
-png_uint_32
+#if defined(PNG_sRGB_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
@@ -403,8 +482,41 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 }
 #endif
 
-#if defined(PNG_READ_hIST_SUPPORTED)
-png_uint_32
+#if defined(PNG_iCCP_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+             png_charpp name, int *compression_type,
+             png_charpp profile, png_uint_32 *proflen)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
+      && name != NULL && profile != NULL && proflen != NULL)
+   {
+      png_debug1(1, "in %s retrieval function\n", "iCCP");
+      *name = info_ptr->iccp_name;
+      *profile = info_ptr->iccp_profile;
+      /* compression_type is a dummy so the API won't have to change
+         if we introduce multiple compression types later. */
+      *proflen = (int)info_ptr->iccp_proflen;
+      *compression_type = (int)info_ptr->iccp_compression;
+      return (PNG_INFO_iCCP);
+   }
+   return (0);
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+             png_sPLT_tpp spalettes)
+{
+   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
+     *spalettes = info_ptr->splt_palettes;
+   return ((png_uint_32)info_ptr->splt_palettes_num);
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
@@ -418,7 +530,7 @@ png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
 }
 #endif
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *width, png_uint_32 *height, int *bit_depth,
    int *color_type, int *interlace_type, int *compression_type,
@@ -464,10 +576,10 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    return (0);
 }
 
-#if defined(PNG_READ_oFFs_SUPPORTED)
-png_uint_32
+#if defined(PNG_oFFs_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)
+   png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
       && offset_x != NULL && offset_y != NULL && unit_type != NULL)
@@ -482,14 +594,14 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pCAL_SUPPORTED)
-png_uint_32
+#if defined(PNG_pCAL_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
    png_charp *units, png_charpp *params)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
-      purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
+      && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
       nparams != NULL && units != NULL && params != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "pCAL");
@@ -506,14 +618,51 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
-png_uint_32
+#if defined(PNG_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+             int *unit, double *width, double *height)
+{
+    if (png_ptr != NULL && info_ptr != NULL &&
+       (info_ptr->valid & PNG_INFO_sCAL))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_pixel_width;
+        *height = info_ptr->scal_pixel_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+             int *unit, png_charpp width, png_charpp height)
+{
+    if (png_ptr != NULL && info_ptr != NULL &&
+       (info_ptr->valid & PNG_INFO_sCAL))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_s_width;
+        *height = info_ptr->scal_s_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#endif
+#endif
+#endif
+
+#if defined(PNG_pHYs_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
 
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL &&
+      (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function\n", "pHYs");
       if (res_x != NULL)
@@ -536,12 +685,12 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    int *num_palette)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
-       palette != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
+       && palette != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "PLTE");
       *palette = info_ptr->palette;
@@ -552,12 +701,12 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    return (0);
 }
 
-#if defined(PNG_READ_sBIT_SUPPORTED)
-png_uint_32
+#if defined(PNG_sBIT_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
-       sig_bit != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
+      && sig_bit != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "sBIT");
       *sig_bit = &(info_ptr->sig_bit);
@@ -567,8 +716,8 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 }
 #endif
 
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-png_uint_32
+#if defined(PNG_TEXT_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
    int *num_text)
 {
@@ -583,16 +732,18 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
          *num_text = info_ptr->num_text;
       return ((png_uint_32)info_ptr->num_text);
    }
+   if (num_text != NULL)
+     *num_text = 0;
    return(0);
 }
 #endif
 
-#if defined(PNG_READ_tIME_SUPPORTED)
-png_uint_32
+#if defined(PNG_tIME_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
-       mod_time != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
+       && mod_time != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "tIME");
       *mod_time = &(info_ptr->mod_time);
@@ -602,13 +753,13 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 }
 #endif
 
-#if defined(PNG_READ_tRNS_SUPPORTED)
-png_uint_32
+#if defined(PNG_tRNS_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep *trans, int *num_trans, png_color_16p *trans_values)
 {
    png_uint_32 retval = 0;
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
    {
       png_debug1(1, "in %s retrieval function\n", "tRNS");
       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
@@ -641,10 +792,126 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-png_byte
-png_get_rgb_to_gray_status (png_structp png_ptr)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+             png_unknown_chunkpp unknowns)
 {
-   return png_ptr->rgb_to_gray_status;
+   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
+     *unknowns = info_ptr->unknown_chunks;
+   return ((png_uint_32)info_ptr->unknown_chunks_num);
 }
 #endif
+
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+png_byte PNGAPI
+png_get_rgb_to_gray_status (png_structp png_ptr)
+{
+   return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
+}
+#endif
+
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
+png_voidp PNGAPI
+png_get_user_chunk_ptr(png_structp png_ptr)
+{
+   return (png_ptr? png_ptr->user_chunk_ptr : NULL);
+}
+#endif
+
+
+png_uint_32 PNGAPI
+png_get_compression_buffer_size(png_structp png_ptr)
+{
+   return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
+}
+
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 and should exist by default*/
+png_uint_32 PNGAPI
+png_get_asm_flags (png_structp png_ptr)
+{
+    return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
+}
+
+/* this function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flagmask (int flag_select)
+{
+    png_uint_32 settable_asm_flags = 0;
+
+    if (flag_select & PNG_SELECT_READ)
+        settable_asm_flags |=
+          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
+          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+          /* no non-MMX flags yet */
+
+#if 0
+    /* GRR:  no write-flags yet, either, but someday... */
+    if (flag_select & PNG_SELECT_WRITE)
+        settable_asm_flags |=
+          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+    return settable_asm_flags;  /* _theoretically_ settable capabilities only */
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+
+
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_flagmask (int flag_select, int *compilerID)
+{
+    png_uint_32 settable_mmx_flags = 0;
+
+    if (flag_select & PNG_SELECT_READ)
+        settable_mmx_flags |=
+          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
+          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+#if 0
+    /* GRR:  no MMX write support yet, but someday... */
+    if (flag_select & PNG_SELECT_WRITE)
+        settable_mmx_flags |=
+          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+    if (compilerID != NULL) {
+#ifdef PNG_USE_PNGVCRD
+        *compilerID = 1;    /* MSVC */
+#else
+#ifdef PNG_USE_PNGGCCRD
+        *compilerID = 2;    /* gcc/gas */
+#else
+        *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
+#endif
+#endif
+    }
+
+    return settable_mmx_flags;  /* _theoretically_ settable capabilities only */
+}
+
+/* this function was added to libpng 1.2.0 */
+png_byte PNGAPI
+png_get_mmx_bitdepth_threshold (png_structp png_ptr)
+{
+    return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
+}
+
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_rowbytes_threshold (png_structp png_ptr)
+{
+    return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */

pngmem.c

@@ -1,11 +1,11 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to supply replacement
@@ -23,16 +23,16 @@
 
 /* Allocate memory for a png_struct.  The malloc and memset can be replaced
    by a single call to calloc() if this is thought to improve performance. */
-png_voidp
+png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL));
+   return (png_create_struct_2(type, NULL, NULL));
 }
 
 /* Alternate version of png_create_struct, for use with user-defined malloc. */
-png_voidp
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
@@ -48,9 +48,18 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
 #ifdef PNG_USER_MEM_SUPPORTED
    if(malloc_fn != NULL)
    {
-      if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
+      if (mem_ptr != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         struct_ptr = (*(malloc_fn))(png_ptr, size);
+      }
+      else
+         struct_ptr = (*(malloc_fn))(NULL, size);
+      if (struct_ptr != NULL)
          png_memset(struct_ptr, 0, size);
-         return (struct_ptr);
+      return (struct_ptr);
    }
 #endif /* PNG_USER_MEM_SUPPORTED */
    if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
@@ -62,16 +71,17 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
 
 
 /* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL, (png_voidp)NULL);
 }
 
 /* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
 {
 #endif
    if (struct_ptr != NULL)
@@ -81,6 +91,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
       {
          png_struct dummy_struct;
          png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
          (*(free_fn))(png_ptr, struct_ptr);
          return;
       }
@@ -108,7 +119,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
  * result, we would be truncating potentially larger memory requests
  * (which should cause a fatal error) and introducing major problems.
  */
-png_voidp
+png_voidp PNGAPI
 png_malloc(png_structp png_ptr, png_uint_32 size)
 {
 #ifndef PNG_USER_MEM_SUPPORTED
@@ -119,12 +130,17 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(png_ptr->malloc_fn != NULL)
-       return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+       if (ret == NULL)
+          png_error(png_ptr, "Out of memory!");
+       return (ret);
+   }
    else
        return png_malloc_default(png_ptr, size);
 }
 
-png_voidp
+png_voidp PNGAPI
 png_malloc_default(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ret;
@@ -224,7 +240,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 /* free a pointer allocated by png_malloc().  In the default
    configuration, png_ptr is not used, but is passed in case it
    is needed.  If ptr is NULL, return without taking any action. */
-void
+void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
    if (png_ptr == NULL || ptr == NULL)
@@ -239,7 +255,7 @@ png_free(png_structp png_ptr, png_voidp ptr)
    else png_free_default(png_ptr, ptr);
 }
 
-void
+void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
@@ -277,18 +293,18 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 /* Allocate memory for a png_struct or a png_info.  The malloc and
    memset can be replaced by a single call to calloc() if this is thought
    to improve performance noticably.*/
-png_voidp
+png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL));
+   return (png_create_struct_2(type, NULL, NULL));
 }
 
 /* Allocate memory for a png_struct or a png_info.  The malloc and
    memset can be replaced by a single call to calloc() if this is thought
    to improve performance noticably.*/
-png_voidp
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
@@ -304,7 +320,16 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
 #ifdef PNG_USER_MEM_SUPPORTED
    if(malloc_fn != NULL)
    {
-      if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
+      if (mem_ptr != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         struct_ptr = (*(malloc_fn))(png_ptr, size);
+      }
+      else
+         struct_ptr = (*(malloc_fn))(NULL, size);
+      if (struct_ptr != NULL)
          png_memset(struct_ptr, 0, size);
       return (struct_ptr);
    }
@@ -328,16 +353,17 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
 
 
 /* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL, (png_voidp)NULL);
 }
 
 /* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    if (struct_ptr != NULL)
@@ -347,6 +373,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
       {
          png_struct dummy_struct;
          png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
          (*(free_fn))(png_ptr, struct_ptr);
          return;
       }
@@ -370,22 +397,25 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
    need to allocate exactly 64K, so whatever you call here must
    have the ability to do that. */
 
-png_voidp
+png_voidp PNGAPI
 png_malloc(png_structp png_ptr, png_uint_32 size)
 {
-#ifndef PNG_USER_MEM_SUPPORTED
    png_voidp ret;
-#endif
    if (png_ptr == NULL || size == 0)
       return ((png_voidp)NULL);
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(png_ptr->malloc_fn != NULL)
-       return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+       if (ret == NULL)
+          png_error(png_ptr, "Out of Memory!");
+       return (ret);
+   }
    else
        return (png_malloc_default(png_ptr, size));
 }
-png_voidp
+png_voidp /* PRIVATE */
 png_malloc_default(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ret;
@@ -407,16 +437,14 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 #endif
 
    if (ret == NULL)
-   {
       png_error(png_ptr, "Out of Memory");
-   }
 
    return (ret);
 }
 
 /* Free a pointer allocated by png_malloc().  If ptr is NULL, return
    without taking any action. */
-void
+void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
    if (png_ptr == NULL || ptr == NULL)
@@ -430,7 +458,7 @@ png_free(png_structp png_ptr, png_voidp ptr)
    }
    else png_free_default(png_ptr, ptr);
 }
-void
+void /* PRIVATE */
 png_free_default(png_structp png_ptr, png_voidp ptr)
 {
    if (png_ptr == NULL || ptr == NULL)
@@ -451,7 +479,7 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 
 #endif /* Not Borland DOS special memory handler */
 
-png_voidp
+png_voidp /* PRIVATE */
 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
    png_uint_32 length)
 {
@@ -464,7 +492,7 @@ png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
    return(png_memcpy (s1, s2, size));
 }
 
-png_voidp
+png_voidp /* PRIVATE */
 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
    png_uint_32 length)
 {
@@ -482,7 +510,7 @@ png_memset_check (png_structp png_ptr, png_voidp s1, int value,
 /* This function is called when the application wants to use another method
  * of allocating and freeing memory.
  */
-void
+void PNGAPI
 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
   malloc_fn, png_free_ptr free_fn)
 {
@@ -495,7 +523,7 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy and png_read_destroy are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_mem_ptr(png_structp png_ptr)
 {
    return ((png_voidp)png_ptr->mem_ptr);

pngpread.c

@@ -1,11 +1,11 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
 
 #define PNG_INTERNAL
@@ -13,7 +13,18 @@
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 
-void
+/* push model modes */
+#define PNG_READ_SIG_MODE   0
+#define PNG_READ_CHUNK_MODE 1
+#define PNG_READ_IDAT_MODE  2
+#define PNG_SKIP_MODE       3
+#define PNG_READ_tEXt_MODE  4
+#define PNG_READ_zTXt_MODE  5
+#define PNG_READ_DONE_MODE  6
+#define PNG_READ_iTXt_MODE  7
+#define PNG_ERROR_MODE      8
+
+void PNGAPI
 png_process_data(png_structp png_ptr, png_infop info_ptr,
    png_bytep buffer, png_size_t buffer_size)
 {
@@ -28,7 +39,7 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
 /* What we do with the incoming data depends on what we were previously
  * doing before we ran out of data...
  */
-void
+void /* PRIVATE */
 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
 {
    switch (png_ptr->process_mode)
@@ -61,6 +72,13 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
          png_push_read_zTXt(png_ptr, info_ptr);
          break;
       }
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      case PNG_READ_iTXt_MODE:
+      {
+         png_push_read_iTXt(png_ptr, info_ptr);
+         break;
+      }
 #endif
       case PNG_SKIP_MODE:
       {
@@ -81,7 +99,7 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
  * checked by the calling application, or because of multiple calls to this
  * routine.
  */
-void
+void /* PRIVATE */
 png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
 {
    png_size_t num_checked = png_ptr->sig_bytes,
@@ -113,7 +131,7 @@ png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
    }
 }
 
-void
+void /* PRIVATE */
 png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
@@ -133,6 +151,12 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_hIST_SUPPORTED)
       PNG_hIST;
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      PNG_iTXt;
+#endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
       PNG_oFFs;
 #endif
@@ -145,9 +169,15 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_sBIT_SUPPORTED)
       PNG_sBIT;
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      PNG_sCAL;
+#endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
       PNG_sRGB;
 #endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+      PNG_sPLT;
+#endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
       PNG_tEXt;
 #endif
@@ -287,6 +317,30 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
    }
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+   else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
+   }
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+   else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
+   }
+#endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
    {
@@ -359,6 +413,18 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
    }
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+   else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+   {
+      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
+   }
+#endif
 #if defined(PNG_READ_tIME_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
    {
@@ -382,6 +448,12 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
    {
       png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
    }
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+   else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+   {
+      png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
+   }
 #endif
    else
    {
@@ -391,14 +463,14 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
    png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
 }
 
-void
+void /* PRIVATE */
 png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
 {
    png_ptr->process_mode = PNG_SKIP_MODE;
    png_ptr->skip_length = skip;
 }
 
-void
+void /* PRIVATE */
 png_push_crc_finish(png_structp png_ptr)
 {
    if (png_ptr->skip_length && png_ptr->save_buffer_size)
@@ -446,7 +518,7 @@ png_push_crc_finish(png_structp png_ptr)
    }
 }
 
-void
+void /* PRIVATE */
 png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 {
    png_bytep ptr;
@@ -484,7 +556,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
    }
 }
 
-void
+void /* PRIVATE */
 png_push_save_buffer(png_structp png_ptr)
 {
    if (png_ptr->save_buffer_size)
@@ -528,7 +600,7 @@ png_push_save_buffer(png_structp png_ptr)
    png_ptr->buffer_size = 0;
 }
 
-void
+void /* PRIVATE */
 png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
    png_size_t buffer_length)
 {
@@ -538,7 +610,7 @@ png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
    png_ptr->current_buffer_ptr = png_ptr->current_buffer;
 }
 
-void
+void /* PRIVATE */
 png_push_read_IDAT(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
@@ -628,7 +700,7 @@ png_push_read_IDAT(png_structp png_ptr)
    }
 }
 
-void
+void /* PRIVATE */
 png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
    png_size_t buffer_length)
 {
@@ -642,23 +714,26 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
    for(;;)
    {
       ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
-      if (ret == Z_STREAM_END)
+      if (ret != Z_OK)
       {
-         if (png_ptr->zstream.avail_in)
-            png_error(png_ptr, "Extra compressed data");
-         if (!(png_ptr->zstream.avail_out))
+         if (ret == Z_STREAM_END)
          {
-            png_push_process_row(png_ptr);
-         }
+            if (png_ptr->zstream.avail_in)
+               png_error(png_ptr, "Extra compressed data");
+            if (!(png_ptr->zstream.avail_out))
+            {
+               png_push_process_row(png_ptr);
+            }
 
-         png_ptr->mode |= PNG_AFTER_IDAT;
-         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
-         break;
+            png_ptr->mode |= PNG_AFTER_IDAT;
+            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+            break;
+         }
+         else if (ret == Z_BUF_ERROR)
+            break;
+         else
+            png_error(png_ptr, "Decompression Error");
       }
-      else if (ret == Z_BUF_ERROR)
-         break;
-      else if (ret != Z_OK)
-         png_error(png_ptr, "Decompression Error");
       if (!(png_ptr->zstream.avail_out))
       {
          png_push_process_row(png_ptr);
@@ -670,7 +745,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
    }
 }
 
-void
+void /* PRIVATE */
 png_push_process_row(png_structp png_ptr)
 {
    png_ptr->row_info.color_type = png_ptr->color_type;
@@ -697,18 +772,42 @@ png_push_process_row(png_structp png_ptr)
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       if (png_ptr->pass < 6)
+/*       old interface (pre-1.0.9):
          png_do_read_interlace(&(png_ptr->row_info),
             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+         png_do_read_interlace(png_ptr);
 
-      switch (png_ptr->pass)
-      {
+    switch (png_ptr->pass)
+    {
          case 0:
          {
             int i;
             for (i = 0; i < 8 && png_ptr->pass == 0; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
+               png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
+            }
+            if (png_ptr->pass == 2) /* pass 1 might be empty */
+            {
+               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+               {
+                  png_push_have_row(png_ptr, NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+	    if (png_ptr->pass == 4 && png_ptr->height <= 4)
+	    {
+	        for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+                {
+                   png_push_have_row(png_ptr, NULL);
+                   png_read_push_finish_row(png_ptr);
+                }
+            }
+            if (png_ptr->pass == 6 && png_ptr->height <= 4)
+            {
+                png_push_have_row(png_ptr, NULL);
+                png_read_push_finish_row(png_ptr);
             }
             break;
          }
@@ -720,7 +819,7 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 2)
+            if (png_ptr->pass == 2) /* skip top 4 generated rows */
             {
                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
                {
@@ -743,6 +842,14 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, NULL);
                png_read_push_finish_row(png_ptr);
             }
+            if (png_ptr->pass == 4) /* pass 3 might be empty */
+            {
+               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+               {
+                  png_push_have_row(png_ptr, NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
             break;
          }
          case 3:
@@ -753,7 +860,7 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 4)
+            if (png_ptr->pass == 4) /* skip top two generated rows */
             {
                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
                {
@@ -776,6 +883,11 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, NULL);
                png_read_push_finish_row(png_ptr);
             }
+            if (png_ptr->pass == 6) /* pass 5 might be empty */
+            {
+               png_push_have_row(png_ptr, NULL);
+               png_read_push_finish_row(png_ptr);
+            }
             break;
          }
          case 5:
@@ -786,7 +898,7 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 6)
+            if (png_ptr->pass == 6) /* skip top generated row */
             {
                png_push_have_row(png_ptr, NULL);
                png_read_push_finish_row(png_ptr);
@@ -812,35 +924,35 @@ png_push_process_row(png_structp png_ptr)
    }
 }
 
-void
+void /* PRIVATE */
 png_read_push_finish_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-   
+
    /* start of interlace block */
-   const int png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-   
+   const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+
    /* offset to next interlace block */
-   const int png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-   
+   const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+
    /* start of interlace block in the y direction */
-   const int png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
-   
+   const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+
    /* offset to next interlace block in the y direction */
-   const int png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-   
+   const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+
    /* Width of interlace block.  This is not currently used - if you need
     * it, uncomment it here and in png.h
-   const int png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+   const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
    */
-   
+
    /* Height of interlace block.  This is not currently used - if you need
     * it, uncomment it here and in png.h
-   const int png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+   const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
    */
 #endif
-   
+
    png_ptr->row_number++;
    if (png_ptr->row_number < png_ptr->num_rows)
       return;
@@ -853,6 +965,11 @@ png_read_push_finish_row(png_structp png_ptr)
       do
       {
          png_ptr->pass++;
+         if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
+             (png_ptr->pass == 3 && png_ptr->width < 3) ||
+             (png_ptr->pass == 5 && png_ptr->width < 2))
+           png_ptr->pass++;
+
          if (png_ptr->pass >= 7)
             break;
 
@@ -877,10 +994,11 @@ png_read_push_finish_row(png_structp png_ptr)
 }
 
 #if defined(PNG_READ_tEXt_SUPPORTED)
-void
-png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
-   if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place tEXt");
          /* to quiet some compiler warnings */
@@ -890,7 +1008,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
 #ifdef PNG_MAX_MALLOC_64K
    png_ptr->skip_length = 0;  /* This may not be necessary */
 
-   if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
    {
       png_warning(png_ptr, "tEXt chunk too large to fit in memory");
       png_ptr->skip_length = length - (png_uint_32)65535L;
@@ -907,7 +1025,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
    png_ptr->process_mode = PNG_READ_tEXt_MODE;
 }
 
-void
+void /* PRIVATE */
 png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr->buffer_size && png_ptr->current_text_left)
@@ -953,20 +1071,26 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
       text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
       text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+      text_ptr->lang = (char *)NULL;
+      text_ptr->lang_key = (char *)NULL;
+#endif
       text_ptr->text = text;
 
       png_set_text(png_ptr, info_ptr, text_ptr, 1);
 
+      png_free(png_ptr, key);
       png_free(png_ptr, text_ptr);
    }
 }
 #endif
 
 #if defined(PNG_READ_zTXt_SUPPORTED)
-void
-png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
-   if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place zTXt");
          /* to quiet some compiler warnings */
@@ -995,7 +1119,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
    png_ptr->process_mode = PNG_READ_zTXt_MODE;
 }
 
-void
+void /* PRIVATE */
 png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr->buffer_size && png_ptr->current_text_left)
@@ -1076,8 +1200,8 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
             if (text == NULL)
             {
                text = (png_charp)png_malloc(png_ptr,
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
-                     key_size + 1));
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+                     + key_size + 1));
                png_memcpy(text + key_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
                png_memcpy(text, key, key_size);
@@ -1132,52 +1256,213 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
       text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+      text_ptr->lang = (char *)NULL;
+      text_ptr->lang_key = (char *)NULL;
+#endif
       text_ptr->text = text;
 
       png_set_text(png_ptr, info_ptr, text_ptr, 1);
 
+      png_free(png_ptr, key);
+      png_free(png_ptr, text_ptr);
+   }
+}
+#endif
+
+#if defined(PNG_READ_iTXt_SUPPORTED)
+void /* PRIVATE */
+png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
+{
+   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
+      {
+         png_error(png_ptr, "Out of place iTXt");
+         /* to quiet some compiler warnings */
+         if(info_ptr == NULL) return;
+      }
+
+#ifdef PNG_MAX_MALLOC_64K
+   png_ptr->skip_length = 0;  /* This may not be necessary */
+
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
+   {
+      png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+      png_ptr->skip_length = length - (png_uint_32)65535L;
+      length = (png_uint_32)65535L;
+   }
+#endif
+
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+         (png_uint_32)(length+1));
+   png_ptr->current_text[length] = '\0';
+   png_ptr->current_text_ptr = png_ptr->current_text;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
+   png_ptr->process_mode = PNG_READ_iTXt_MODE;
+}
+
+void /* PRIVATE */
+png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
+{
+
+   if (png_ptr->buffer_size && png_ptr->current_text_left)
+   {
+      png_size_t text_size;
+
+      if (png_ptr->buffer_size < png_ptr->current_text_left)
+         text_size = png_ptr->buffer_size;
+      else
+         text_size = png_ptr->current_text_left;
+      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
+      png_ptr->current_text_left -= text_size;
+      png_ptr->current_text_ptr += text_size;
+   }
+   if (!(png_ptr->current_text_left))
+   {
+      png_textp text_ptr;
+      png_charp key;
+      int comp_flag;
+      png_charp lang;
+      png_charp lang_key;
+      png_charp text;
+
+      if (png_ptr->buffer_size < 4)
+      {
+         png_push_save_buffer(png_ptr);
+         return;
+      }
+
+      png_push_crc_finish(png_ptr);
+
+#if defined(PNG_MAX_MALLOC_64K)
+      if (png_ptr->skip_length)
+         return;
+#endif
+
+      key = png_ptr->current_text;
+      png_ptr->current_text = 0;
+
+      for (lang = key; *lang; lang++)
+         /* empty loop */ ;
+
+      if (lang != key + png_ptr->current_text_size)
+         lang++;
+
+      comp_flag = *lang++;
+      lang++;     /* skip comp_type, always zero */
+
+      for (lang_key = lang; *lang_key; lang_key++)
+         /* empty loop */ ;
+      lang_key++;        /* skip NUL separator */
+
+      for (text = lang_key; *text; text++)
+         /* empty loop */ ;
+
+      if (text != key + png_ptr->current_text_size)
+         text++;
+
+      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+      text_ptr->compression = comp_flag + 2;
+      text_ptr->key = key;
+      text_ptr->lang = lang;
+      text_ptr->lang_key = lang_key;
+      text_ptr->text = text;
+      text_ptr->text_length = 0;
+      text_ptr->itxt_length = png_strlen(text);
+
+      png_set_text(png_ptr, info_ptr, text_ptr, 1);
+
       png_free(png_ptr, text_ptr);
    }
 }
 #endif
 
 /* This function is called when we haven't found a handler for this
- * chunk.  In the future we will have code here that can handle
- * user-defined callback functions for unknown chunks before they are
- * ignored or cause an error.  If there isn't a problem with the
- * chunk itself (ie a bad chunk name or a critical chunk), the chunk
- * is (currently) silently ignored.
+ * chunk.  If there isn't a problem with the chunk itself (ie a bad chunk
+ * name or a critical chunk), the chunk is (currently) silently ignored.
  */
-void
-png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
+   png_uint_32 skip=0;
    png_check_chunk_name(png_ptr, png_ptr->chunk_name);
 
    if (!(png_ptr->chunk_name[0] & 0x20))
    {
-      png_chunk_error(png_ptr, "unknown critical chunk");
-      /* to quiet some compiler warnings */
-      if(info_ptr == NULL) return;
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+      if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+           HANDLE_CHUNK_ALWAYS
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+           && png_ptr->read_user_chunk_fn == NULL
+#endif
+         )
+#endif
+         png_chunk_error(png_ptr, "unknown critical chunk");
+
+      /* to quiet compiler warnings about unused info_ptr */
+      if (info_ptr == NULL)
+         return;
    }
 
-   png_push_crc_skip(png_ptr, length);
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+   if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+   {
+       png_unknown_chunk chunk;
+
+#ifdef PNG_MAX_MALLOC_64K
+       if (length > (png_uint_32)65535L)
+       {
+           png_warning(png_ptr, "unknown chunk too large to fit in memory");
+           skip = length - (png_uint_32)65535L;
+           length = (png_uint_32)65535L;
+       }
+#endif
+
+       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+       chunk.data = (png_bytep)png_malloc(png_ptr, length);
+       png_crc_read(png_ptr, chunk.data, length);
+       chunk.size = length;
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+       if(png_ptr->read_user_chunk_fn != NULL)
+       {
+          /* callback to user unknown chunk handler */
+          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+          {
+             if (!(png_ptr->chunk_name[0] & 0x20))
+                if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+                     HANDLE_CHUNK_ALWAYS)
+                   png_chunk_error(png_ptr, "unknown critical chunk");
+          }
+             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+       }
+       else
+#endif
+          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+       png_free(png_ptr, chunk.data);
+   }
+   else
+#endif
+      skip=length;
+   png_push_crc_skip(png_ptr, skip);
 }
 
-void
+void /* PRIVATE */
 png_push_have_info(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr->info_fn != NULL)
       (*(png_ptr->info_fn))(png_ptr, info_ptr);
 }
 
-void
+void /* PRIVATE */
 png_push_have_end(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr->end_fn != NULL)
       (*(png_ptr->end_fn))(png_ptr, info_ptr);
 }
 
-void
+void /* PRIVATE */
 png_push_have_row(png_structp png_ptr, png_bytep row)
 {
    if (png_ptr->row_fn != NULL)
@@ -1185,18 +1470,19 @@ png_push_have_row(png_structp png_ptr, png_bytep row)
          (int)png_ptr->pass);
 }
 
-void
+void PNGAPI
 png_progressive_combine_row (png_structp png_ptr,
    png_bytep old_row, png_bytep new_row)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+   const int FARDATA png_pass_dsp_mask[7] =
+      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 #endif
    if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
       png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
 }
 
-void
+void PNGAPI
 png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn)
@@ -1208,7 +1494,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
    png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
 }
 
-png_voidp
+png_voidp PNGAPI
 png_get_progressive_ptr(png_structp png_ptr)
 {
    return png_ptr->io_ptr;

pngread.c

@@ -1,11 +1,11 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -15,7 +15,7 @@
 #include "png.h"
 
 /* Create a PNG structure for reading, and allocate any memory needed. */
-png_structp
+png_structp PNGAPI
 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
@@ -26,7 +26,7 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 }
 
 /* Alternate create PNG structure for reading, and allocate any memory needed. */
-png_structp
+png_structp PNGAPI
 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
@@ -34,19 +34,27 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif /* PNG_USER_MEM_SUPPORTED */
 
    png_structp png_ptr;
+
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
    jmp_buf jmpbuf;
 #endif
+#endif
+
+   int i;
+
    png_debug(1, "in png_create_read_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
    if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
-      (png_malloc_ptr)malloc_fn)) == NULL)
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr)) == NULL)
 #else
    if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
 #endif
    {
       return (png_structp)NULL;
    }
+
+#ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
 #else
@@ -54,29 +62,56 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);
+      png_ptr->zbuf=NULL;
       png_destroy_struct(png_ptr);
       return (png_structp)NULL;
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
 #endif
+#endif
 
 #ifdef PNG_USER_MEM_SUPPORTED
    png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif
 
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
-   /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
-    * we must recompile any applications that use any older library version.
-    * For versions after libpng 1.0, we will be compatible, so we need
-    * only check the first digit.
-    */
-   if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
-       (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+   i=0;
+   do
    {
-      png_error(png_ptr,
-         "Incompatible libpng version in application and library");
+     if(user_png_ver[i] != png_libpng_ver[i])
+        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+   } while (png_libpng_ver[i++]);
+
+   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+   {
+     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+      * we must recompile any applications that use any older library version.
+      * For versions after libpng 1.0, we will be compatible, so we need
+      * only check the first digit.
+      */
+     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+         (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+     {
+        png_error(png_ptr,
+           "Incompatible libpng version in application and library");
+     }
+
+     /* Libpng 1.0.6 was not binary compatible, due to insertion of the
+        info_ptr->free_me member.  Libpng-1.0.1 and earlier were not
+        compatible due to insertion of the user transform function. Note
+        to maintainer: this test can be removed from version 1.2.0 and
+        beyond because the previous test would have already rejected it. */
+
+     if (user_png_ver[0] == '1' && user_png_ver[2] == '0' &&
+         (user_png_ver[4] <  '2' || user_png_ver[4] == '6') &&
+         user_png_ver[5] == '\0')
+     {
+        png_error(png_ptr,
+        "Application must be recompiled; versions <= 1.0.6 were incompatible");
+     }
    }
 
    /* initialize zbuf - compression buffer */
@@ -107,20 +142,83 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 /* Initialize PNG structure for reading, and allocate any memory needed.
    This interface is deprecated in favour of the png_create_read_struct(),
    and it will eventually disappear. */
-void
+#undef png_read_init
+void PNGAPI
 png_read_init(png_structp png_ptr)
 {
-   jmp_buf tmp_jmp;  /* to save current jump buffer */
+   /* We only come here via pre-1.0.7-compiled applications */
+   png_read_init_2(png_ptr, "1.0.0", 0, 0);
+}
 
-   png_debug(1, "in png_read_init\n");
+#undef png_read_init_2
+void PNGAPI
+png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size, png_size_t png_info_size)
+{
+   /* We only come here via pre-1.0.12-compiled applications */
+   if(sizeof(png_struct) > png_struct_size)
+     {
+       png_ptr->error_fn=(png_error_ptr)NULL;
+       png_error(png_ptr,
+       "The png struct allocated by the application for reading is too small.");
+     }
+   if(sizeof(png_info) > png_info_size)
+     {
+       png_ptr->error_fn=(png_error_ptr)NULL;
+       png_error(png_ptr,
+         "The info struct allocated by application for reading is too small.");
+     }
+   png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+
+void PNGAPI
+png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size)
+{
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf tmp_jmp;  /* to save current jump buffer */
+#endif
+
+   int i=0;
+
+   png_structp png_ptr=*ptr_ptr;
+
+   do
+   {
+     if(user_png_ver[i] != png_libpng_ver[i])
+     {
+#ifdef PNG_LEGACY_SUPPORTED
+       png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+       png_ptr->warning_fn=(png_error_ptr)NULL;
+       png_warning(png_ptr,
+        "Application uses deprecated png_read_init() and should be recompiled.");
+       break;
+#endif
+     }
+   } while (png_libpng_ver[i++]);
+
+   png_debug(1, "in png_read_init_3\n");
+
+#ifdef PNG_SETJMP_SUPPORTED
    /* save jump buffer and error functions */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
+
+   if(sizeof(png_struct) > png_struct_size)
+     {
+       png_destroy_struct(png_ptr);
+       *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+       png_ptr = *ptr_ptr;
+     }
 
    /* reset all variables to 0 */
    png_memset(png_ptr, 0, sizeof (png_struct));
 
+#ifdef PNG_SETJMP_SUPPORTED
    /* restore jump buffer */
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@@ -153,7 +251,7 @@ png_read_init(png_structp png_ptr)
  * here.  The application can then have access to the signature bytes we
  * read if it is determined that this isn't a valid PNG file.
  */
-void
+void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_info\n");
@@ -175,6 +273,8 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
          else
             png_error(png_ptr, "PNG file corrupted by ASCII conversion");
       }
+      if (num_checked < 3)
+         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
    }
 
    for(;;)
@@ -196,6 +296,12 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_hIST_SUPPORTED)
       PNG_hIST;
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      PNG_iTXt;
+#endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
       PNG_oFFs;
 #endif
@@ -208,6 +314,12 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_sBIT_SUPPORTED)
       PNG_sBIT;
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      PNG_sCAL;
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+      PNG_sPLT;
+#endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
       PNG_sRGB;
 #endif
@@ -233,7 +345,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       png_reset_crc(png_ptr);
       png_crc_read(png_ptr, png_ptr->chunk_name, 4);
 
-      png_debug2(0, "Reading %s chunk, length=%d.\n", png_ptr->chunk_name,
+      png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
          length);
 
       /* This should be a binary subdivision search or a hash for
@@ -241,10 +353,29 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
        */
       if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
          png_handle_IHDR(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
-         png_handle_PLTE(png_ptr, info_ptr, length);
       else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
          png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      {
+         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+            png_ptr->mode |= PNG_HAVE_IDAT;
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+         else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         {
+            if (!(png_ptr->mode & PNG_HAVE_IHDR))
+               png_error(png_ptr, "Missing IHDR before IDAT");
+            else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+                     !(png_ptr->mode & PNG_HAVE_PLTE))
+               png_error(png_ptr, "Missing PLTE before IDAT");
+            break;
+         }
+      }
+#endif
+      else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+         png_handle_PLTE(png_ptr, info_ptr, length);
       else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
       {
          if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -281,6 +412,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
          png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+         png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
          png_handle_pHYs(png_ptr, info_ptr, length);
@@ -293,6 +428,14 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
          png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+         png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+         png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
          png_handle_tEXt(png_ptr, info_ptr, length);
@@ -308,6 +451,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_zTXt_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
          png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+         png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
       else
          png_handle_unknown(png_ptr, info_ptr, length);
@@ -315,13 +462,16 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 }
 
 /* optional call to update the users info_ptr structure */
-void
+void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_update_info\n");
    /* save jump buffer and error functions */
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
+   else
+      png_warning(png_ptr,
+      "Ignoring extra png_read_update_info() call; row buffer not reallocated");
    png_read_transform_info(png_ptr, info_ptr);
 }
 
@@ -330,7 +480,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
  * the user to obtain a gamma-corrected palette, for example.
  * If the user doesn't call this, we will do it ourselves.
  */
-void
+void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
    png_debug(1, "in png_start_read_image\n");
@@ -339,7 +489,7 @@ png_start_read_image(png_structp png_ptr)
       png_read_start_row(png_ptr);
 }
 
-void
+void PNGAPI
 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
@@ -348,7 +498,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 #endif
    int ret;
-   png_debug2(1, "in png_read_row (row %d, pass %d)\n",
+   png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
       png_ptr->row_number, png_ptr->pass);
    /* save jump buffer and error functions */
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
@@ -393,7 +543,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
       switch (png_ptr->pass)
       {
          case 0:
-            if (png_ptr->row_number & 7)
+            if (png_ptr->row_number & 0x07)
             {
                if (dsp_row != NULL)
                   png_combine_row(png_ptr, dsp_row,
@@ -403,7 +553,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
             }
             break;
          case 1:
-            if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
             {
                if (dsp_row != NULL)
                   png_combine_row(png_ptr, dsp_row,
@@ -413,7 +563,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
             }
             break;
          case 2:
-            if ((png_ptr->row_number & 7) != 4)
+            if ((png_ptr->row_number & 0x07) != 4)
             {
                if (dsp_row != NULL && (png_ptr->row_number & 4))
                   png_combine_row(png_ptr, dsp_row,
@@ -518,12 +668,22 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
+   if(png_ptr->row_buf[0])
    png_read_filter_row(png_ptr, &(png_ptr->row_info),
       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
       (int)(png_ptr->row_buf[0]));
 
    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
       png_ptr->rowbytes + 1);
+   
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
@@ -534,8 +694,11 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
       (png_ptr->transformations & PNG_INTERLACE))
    {
       if (png_ptr->pass < 6)
+/*       old interface (pre-1.0.9):
          png_do_read_interlace(&(png_ptr->row_info),
             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+         png_do_read_interlace(png_ptr);
 
       if (dsp_row != NULL)
          png_combine_row(png_ptr, dsp_row,
@@ -579,10 +742,10 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
  * not called png_set_interlace_handling(), the display_row buffer will
  * be ignored, so pass NULL to it.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5d.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.12beta1
  */
 
-void
+void PNGAPI
 png_read_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp display_row, png_uint_32 num_rows)
 {
@@ -628,9 +791,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
  * only call this function once.  If you desire to have an image for
  * each pass of a interlaced image, use png_read_rows() instead.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5d.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.12beta1
  */
-void
+void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
 {
    png_uint_32 i,image_height;
@@ -668,7 +831,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
  * file, will verify the end is accurate, and will read any comments
  * or time information at the end of the file, if info is not NULL.
  */
-void
+void PNGAPI
 png_read_end(png_structp png_ptr, png_infop info_ptr)
 {
    png_byte chunk_length[4];
@@ -697,6 +860,12 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_hIST_SUPPORTED)
       PNG_hIST;
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      PNG_iTXt;
+#endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
       PNG_oFFs;
 #endif
@@ -709,6 +878,12 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_sBIT_SUPPORTED)
       PNG_sBIT;
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      PNG_sCAL;
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+      PNG_sPLT;
+#endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
       PNG_sRGB;
 #endif
@@ -736,6 +911,23 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 
       if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
          png_handle_IHDR(png_ptr, info_ptr, length);
+      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+         png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+      else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+      {
+         if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+         {
+            if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+               png_error(png_ptr, "Too many IDAT's found");
+         }
+         else
+            png_ptr->mode |= PNG_AFTER_IDAT;
+         png_handle_unknown(png_ptr, info_ptr, length);
+         if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+            png_ptr->mode |= PNG_HAVE_PLTE;
+      }
+#endif
       else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
       {
          /* Zero length IDATs are legal after the last IDAT has been
@@ -743,13 +935,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
           */
          if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
             png_error(png_ptr, "Too many IDAT's found");
-         else
-            png_crc_finish(png_ptr, 0);
+         png_crc_finish(png_ptr, length);
       }
       else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
          png_handle_PLTE(png_ptr, info_ptr, length);
-      else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
-         png_handle_IEND(png_ptr, info_ptr, length);
 #if defined(PNG_READ_bKGD_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
          png_handle_bKGD(png_ptr, info_ptr, length);
@@ -774,6 +963,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
       else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
          png_handle_pCAL(png_ptr, info_ptr, length);
 #endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+         png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
          png_handle_pHYs(png_ptr, info_ptr, length);
@@ -786,6 +979,14 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
       else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
          png_handle_sRGB(png_ptr, info_ptr, length);
 #endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+         png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+         png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
          png_handle_tEXt(png_ptr, info_ptr, length);
@@ -801,6 +1002,10 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_READ_zTXt_SUPPORTED)
       else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
          png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+      else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+         png_handle_iTXt(png_ptr, info_ptr, length);
 #endif
       else
          png_handle_unknown(png_ptr, info_ptr, length);
@@ -808,7 +1013,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 }
 
 /* free all memory used by the read */
-void
+void PNGAPI
 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_infopp end_info_ptr_ptr)
 {
@@ -816,7 +1021,8 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_infop info_ptr = NULL, end_info_ptr = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_free_ptr free_fn = NULL;
-#endif /* PNG_USER_MEM_SUPPORTED */
+   png_voidp mem_ptr = NULL;
+#endif
 
    png_debug(1, "in png_destroy_read_struct\n");
    /* save jump buffer and error functions */
@@ -831,18 +1037,20 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 
 #ifdef PNG_USER_MEM_SUPPORTED
    free_fn = png_ptr->free_fn;
+   mem_ptr = png_ptr->mem_ptr;
 #endif
 
    png_read_destroy(png_ptr, info_ptr, end_info_ptr);
 
    if (info_ptr != NULL)
    {
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-      png_free(png_ptr, info_ptr->text);
+#if defined(PNG_TEXT_SUPPORTED)
+      png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
 #endif
 
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)info_ptr, free_fn);
+      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+          (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)info_ptr);
 #endif
@@ -851,11 +1059,12 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 
    if (end_info_ptr != NULL)
    {
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-      png_free(png_ptr, end_info_ptr->text);
+#if defined(PNG_READ_TEXT_SUPPORTED)
+      png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
 #endif
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)end_info_ptr, free_fn);
+      png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)end_info_ptr);
 #endif
@@ -865,7 +1074,8 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    if (png_ptr != NULL)
    {
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)png_ptr, free_fn);
+      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+          (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)png_ptr);
 #endif
@@ -874,10 +1084,12 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 }
 
 /* free all memory used by the read (old method) */
-void
+void /* PRIVATE */
 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
 {
+#ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp;
+#endif
    png_error_ptr error_fn;
    png_error_ptr warning_fn;
    png_voidp error_ptr;
@@ -907,16 +1119,37 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_free(png_ptr, png_ptr->gamma_from_1);
    png_free(png_ptr, png_ptr->gamma_to_1);
 #endif
-   if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_PLTE)
       png_zfree(png_ptr, png_ptr->palette);
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) || \
+   png_ptr->free_me &= ~PNG_FREE_PLTE;
+#else
+   if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
+      png_zfree(png_ptr, png_ptr->palette);
+   png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+#if defined(PNG_tRNS_SUPPORTED) || \
     defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_TRNS)
       png_free(png_ptr, png_ptr->trans);
+   png_ptr->free_me &= ~PNG_FREE_TRNS;
+#else
+   if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
+      png_free(png_ptr, png_ptr->trans);
+   png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+   if (png_ptr->free_me & PNG_FREE_HIST)
+      png_free(png_ptr, png_ptr->hist);
+   png_ptr->free_me &= ~PNG_FREE_HIST;
+#else
    if (png_ptr->flags & PNG_FLAG_FREE_HIST)
       png_free(png_ptr, png_ptr->hist);
+   png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
 #endif
 #if defined(PNG_READ_GAMMA_SUPPORTED)
    if (png_ptr->gamma_16_table != NULL)
@@ -954,7 +1187,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 #endif
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
    png_free(png_ptr, png_ptr->time_buffer);
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
 
    inflateEnd(&png_ptr->zstream);
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -964,7 +1197,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    /* Save the important info out of the png_struct, in case it is
     * being used again.
     */
+#ifdef PNG_SETJMP_SUPPORTED
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
 
    error_fn = png_ptr->error_fn;
    warning_fn = png_ptr->warning_fn;
@@ -982,11 +1217,157 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_ptr->free_fn = free_fn;
 #endif
 
+#ifdef PNG_SETJMP_SUPPORTED
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
+
 }
 
-void
+void PNGAPI
 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 {
    png_ptr->read_row_fn = read_row_fn;
 }
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_read_png(png_structp png_ptr, png_infop info_ptr,
+                           int transforms,
+                           voidp params)
+{
+   int row;
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
+   /* invert the alpha channel from opacity to transparency */
+   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+       png_set_invert_alpha(png_ptr);
+#endif
+
+   /* The call to png_read_info() gives us all of the information from the
+    * PNG file before the first IDAT (image data chunk).
+    */
+   png_read_info(png_ptr, info_ptr);
+
+   /* -------------- image transformations start here ------------------- */
+
+#if defined(PNG_READ_16_TO_8_SUPPORTED)
+   /* tell libpng to strip 16 bit/color files down to 8 bits/color */
+   if (transforms & PNG_TRANSFORM_STRIP_16)
+       png_set_strip_16(png_ptr);
+#endif
+
+#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+   /* Strip alpha bytes from the input data without combining with the
+    * background (not recommended).
+    */
+   if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
+       png_set_strip_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
+   /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
+    * byte into separate bytes (useful for paletted and grayscale images).
+    */
+   if (transforms & PNG_TRANSFORM_PACKING)
+       png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+   /* Change the order of packed pixels to least significant bit first
+    * (not useful if you are using png_set_packing). */
+   if (transforms & PNG_TRANSFORM_PACKSWAP)
+       png_set_packswap(png_ptr);
+#endif
+
+#if defined(PNG_READ_EXPAND_SUPPORTED)
+   /* Expand paletted colors into true RGB triplets
+    * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
+    * Expand paletted or RGB images with transparency to full alpha
+    * channels so the data will be available as RGBA quartets.
+    */
+   if (transforms & PNG_TRANSFORM_EXPAND)
+       if ((png_ptr->bit_depth < 8) ||
+           (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+           (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+         png_set_expand(png_ptr);
+#endif
+
+   /* We don't handle background color or gamma transformation or dithering. */
+
+#if defined(PNG_READ_INVERT_SUPPORTED)
+   /* invert monochrome files to have 0 as white and 1 as black */
+   if (transforms & PNG_TRANSFORM_INVERT_MONO)
+       png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED)
+   /* If you want to shift the pixel values from the range [0,255] or
+    * [0,65535] to the original [0,7] or [0,31], or whatever range the
+    * colors were originally in:
+    */
+   if ((transforms & PNG_TRANSFORM_SHIFT)
+       && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
+   {
+      png_color_8p sig_bit;
+
+      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
+      png_set_shift(png_ptr, sig_bit);
+   }
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED)
+   /* flip the RGB pixels to BGR (or RGBA to BGRA) */
+   if (transforms & PNG_TRANSFORM_BGR)
+       png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
+   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+       png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED)
+   /* swap bytes of 16 bit files to least significant byte first */
+   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+       png_set_swap(png_ptr);
+#endif
+
+   /* We don't handle adding filler bytes */
+
+   /* Optional call to gamma correct and add the background to the palette
+    * and update info structure.  REQUIRED if you are expecting libpng to
+    * update the palette for you (i.e., you selected such a transform above).
+    */
+   png_read_update_info(png_ptr, info_ptr);
+
+   /* -------------- image transformations end here ------------------- */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+#endif
+   if(info_ptr->row_pointers == NULL)
+   {
+      info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
+         info_ptr->height * sizeof(png_bytep));
+#ifdef PNG_FREE_ME_SUPPORTED
+      info_ptr->free_me |= PNG_FREE_ROWS;
+#endif
+      for (row = 0; row < (int)info_ptr->height; row++)
+      {
+         info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
+            png_get_rowbytes(png_ptr, info_ptr));
+      }
+   }
+
+   png_read_image(png_ptr, info_ptr->row_pointers);
+   info_ptr->valid |= PNG_INFO_IDAT;
+
+   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   png_read_end(png_ptr, info_ptr);
+
+   if(transforms == 0 || params == NULL)
+      /* quiet compiler warnings */ return;
+
+}
+#endif

pngrio.c

@@ -1,11 +1,11 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file provides a location for all input.  Users who need
  * special handling are expected to write a function that has the same
@@ -23,10 +23,10 @@
    with very small lengths, so you should implement some kind of simple
    buffering if you are using unbuffered reads.  This should never be asked
    to read more then 64K on a 16 bit machine. */
-void
+void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_debug1(4,"reading %d bytes\n", length);
+   png_debug1(4,"reading %d bytes\n", (int)length);
    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);
    else
@@ -39,7 +39,7 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    read_data function and use it at run time with png_set_read_fn(), rather
    than changing the library. */
 #ifndef USE_FAR_KEYWORD
-static void
+static void /* PRIVATE */
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
@@ -47,13 +47,16 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
+#if defined(_WIN32_WCE)
+   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
    check = (png_size_t)fread(data, (png_size_t)1, length,
-      (FILE *)png_ptr->io_ptr);
+      (png_FILE_p)png_ptr->io_ptr);
+#endif
 
    if (check != length)
-   {
       png_error(png_ptr, "Read Error");
-   }
 }
 #else
 /* this is the model-independent version. Since the standard I/O library
@@ -64,19 +67,24 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+static void /* PRIVATE */
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)n_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+         check = 0;
+#else
       check = fread(n_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -87,7 +95,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
+#if defined(_WIN32_WCE)
+         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+            err = 0;
+#else
          err = fread(buf, (png_size_t)1, read, io_ptr);
+#endif
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;
@@ -99,9 +112,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if ((png_uint_32)check != (png_uint_32)length)
-   {
       png_error(png_ptr, "read Error");
-   }
 }
 #endif
 #endif
@@ -119,7 +130,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
                   unsigned int that is the number of bytes to be read.
                   To exit and output any fatal error messages the new write
                   function should call png_error(png_ptr, "Error msg"). */
-void
+void PNGAPI
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {
@@ -146,6 +157,6 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
    png_ptr->output_flush_fn = NULL;
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
 }
 

pngrtran.c

@@ -1,11 +1,11 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file contains functions optionally called by an application
  * in order to tell libpng how to handle data when reading a PNG.
@@ -17,7 +17,7 @@
 #include "png.h"
 
 /* Set the action on getting a CRC error for an ancillary or critical chunk. */
-void
+void PNGAPI
 png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
 {
    png_debug(1, "in png_set_crc_action\n");
@@ -69,9 +69,10 @@ png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
    }
 }
 
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+    defined(PNG_FLOATING_POINT_SUPPORTED)
 /* handle alpha and tRNS via a background color */
-void
+void PNGAPI
 png_set_background(png_structp png_ptr,
    png_color_16p background_color, int background_gamma_code,
    int need_expand, double background_gamma)
@@ -104,7 +105,7 @@ png_set_background(png_structp png_ptr,
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
 /* strip 16 bit depth files to 8 bit depth */
-void
+void PNGAPI
 png_set_strip_16(png_structp png_ptr)
 {
    png_debug(1, "in png_set_strip_16\n");
@@ -113,7 +114,7 @@ png_set_strip_16(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-void
+void PNGAPI
 png_set_strip_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_strip_alpha\n");
@@ -140,7 +141,7 @@ typedef struct png_dsort_struct
 typedef png_dsort FAR *       png_dsortp;
 typedef png_dsort FAR * FAR * png_dsortpp;
 
-void
+void PNGAPI
 png_set_dither(png_structp png_ptr, png_colorp palette,
    int num_palette, int maximum_colors, png_uint_16p histogram,
    int full_dither)
@@ -366,7 +367,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
                      {
                         int j, next_j;
 
-                        if (num_new_palette & 1)
+                        if (num_new_palette & 0x01)
                         {
                            j = p->left;
                            next_j = p->right;
@@ -504,13 +505,13 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
 }
 #endif
 
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
 /* Transform the image from the file_gamma to the screen_gamma.  We
  * only do transformations on images where the file_gamma and screen_gamma
  * are not close reciprocals, otherwise it slows things down slightly, and
  * also needlessly introduces small errors.
  */
-void
+void PNGAPI
 png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
 {
    png_debug(1, "in png_set_gamma\n");
@@ -526,7 +527,7 @@ png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
  * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
  * to alpha channels.
  */
-void
+void PNGAPI
 png_set_expand(png_structp png_ptr)
 {
    png_debug(1, "in png_set_expand\n");
@@ -548,7 +549,7 @@ png_set_expand(png_structp png_ptr)
  */
 
 /* Expand paletted images to RGB. */
-void
+void PNGAPI
 png_set_palette_to_rgb(png_structp png_ptr)
 {
    png_debug(1, "in png_set_expand\n");
@@ -556,7 +557,7 @@ png_set_palette_to_rgb(png_structp png_ptr)
 }
 
 /* Expand grayscale images of less than 8-bit depth to 8 bits. */
-void
+void PNGAPI
 png_set_gray_1_2_4_to_8(png_structp png_ptr)
 {
    png_debug(1, "in png_set_expand\n");
@@ -564,7 +565,7 @@ png_set_gray_1_2_4_to_8(png_structp png_ptr)
 }
 
 /* Expand tRNS chunks to alpha channels. */
-void
+void PNGAPI
 png_set_tRNS_to_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_expand\n");
@@ -573,7 +574,7 @@ png_set_tRNS_to_alpha(png_structp png_ptr)
 #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
 
 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-void
+void PNGAPI
 png_set_gray_to_rgb(png_structp png_ptr)
 {
    png_debug(1, "in png_set_gray_to_rgb\n");
@@ -582,12 +583,24 @@ png_set_gray_to_rgb(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#if defined(PNG_FLOATING_POINT_SUPPORTED)
 /* Convert a RGB image to a grayscale of the same width.  This allows us,
  * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
  */
-void
+
+void PNGAPI
 png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
-  double green)
+   double green)
+{
+      int red_fixed = (int)((float)red*100000.0 + 0.5);
+      int green_fixed = (int)((float)green*100000.0 + 0.5);
+      png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
+}
+#endif
+
+void PNGAPI
+png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
+   png_fixed_point red, png_fixed_point green)
 {
    png_debug(1, "in png_set_rgb_to_gray\n");
    switch(error_action)
@@ -608,41 +621,54 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
    }
 #endif
    {
-      png_byte red_byte = (png_byte)((float)red*255.0 + 0.5);
-      png_byte green_byte = (png_byte)((float)green*255.0 + 0.5);
-      if(red < 0.0 || green < 0.0)
+      png_uint_16 red_int, green_int;
+      if(red < 0 || green < 0)
       {
-         red_byte = 54;
-         green_byte = 183;
+         red_int   =  6968; /* .212671 * 32768 + .5 */
+         green_int = 23434; /* .715160 * 32768 + .5 */
       }
-      else if(red_byte + green_byte > 255)
+      else if(red + green < 100000L)
+      {
+        red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
+        green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
+      }
+      else
       {
          png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
-         red_byte = 54;
-         green_byte = 183;
+         red_int   =  6968;
+         green_int = 23434;
       }
-      png_ptr->rgb_to_gray_red_coeff   = red_byte;
-      png_ptr->rgb_to_gray_green_coeff = green_byte;
-      png_ptr->rgb_to_gray_blue_coeff  = (png_byte)(255-red_byte-green_byte);
+      png_ptr->rgb_to_gray_red_coeff   = red_int;
+      png_ptr->rgb_to_gray_green_coeff = green_int;
+      png_ptr->rgb_to_gray_blue_coeff  = (png_uint_16)(32768-red_int-green_int);
    }
 }
 #endif
 
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-void
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+void PNGAPI
 png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    read_user_transform_fn)
 {
    png_debug(1, "in png_set_read_user_transform_fn\n");
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->read_user_transform_fn = read_user_transform_fn;
+#endif
+#ifdef PNG_LEGACY_SUPPORTED
+   if(read_user_transform_fn)
+      png_warning(png_ptr,
+        "This version of libpng does not support user transforms");
+#endif
 }
 #endif
 
 /* Initialize everything needed for the read.  This includes modifying
  * the palette.
  */
-void
+void /* PRIVATE */
 png_init_read_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_init_read_transformations\n");
@@ -656,7 +682,8 @@ png_init_read_transformations(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
-   if (png_ptr->transformations & PNG_BACKGROUND_EXPAND)
+   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+       (png_ptr->transformations & PNG_EXPAND))
    {
       if (!(color_type & PNG_COLOR_MASK_COLOR))  /* i.e., GRAY or GRAY_ALPHA */
       {
@@ -718,7 +745,7 @@ png_init_read_transformations(png_structp png_ptr)
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
    png_ptr->background_1 = png_ptr->background;
 #endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
    if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY))
    {
       png_build_gamma_table(png_ptr);
@@ -731,7 +758,6 @@ png_init_read_transformations(png_structp png_ptr)
             png_colorp palette = png_ptr->palette;
             int num_palette = png_ptr->num_palette;
             int i;
-
             if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
             {
                back.red = png_ptr->gamma_table[png_ptr->background.red];
@@ -789,7 +815,6 @@ png_init_read_transformations(png_structp png_ptr)
                back_1.blue = (png_byte)(pow(
                   (double)png_ptr->background.blue/255, g) * 255.0 + .5);
             }
-
             for (i = 0; i < num_palette; i++)
             {
                if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff)
@@ -897,8 +922,8 @@ png_init_read_transformations(png_structp png_ptr)
 #endif
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
    /* No GAMMA transformation */
-   if (png_ptr->transformations & PNG_BACKGROUND &&
-       color_type == PNG_COLOR_TYPE_PALETTE)
+   if ((png_ptr->transformations & PNG_BACKGROUND) &&
+       (color_type == PNG_COLOR_TYPE_PALETTE))
    {
       int i;
       int istop = (int)png_ptr->num_trans;
@@ -931,7 +956,7 @@ png_init_read_transformations(png_structp png_ptr)
 
 #if defined(PNG_READ_SHIFT_SUPPORTED)
    if ((png_ptr->transformations & PNG_SHIFT) &&
-      color_type == PNG_COLOR_TYPE_PALETTE)
+      (color_type == PNG_COLOR_TYPE_PALETTE))
    {
       png_uint_16 i;
       png_uint_16 istop = png_ptr->num_palette;
@@ -954,13 +979,18 @@ png_init_read_transformations(png_structp png_ptr)
    }
 #endif
  }
+#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
+ && !defined(PNG_READ_BACKGROUND_SUPPORTED)
+   if(png_ptr)
+      return;
+#endif
 }
 
 /* Modify the info structure to reflect the transformations.  The
  * info should be updated so a PNG file could be written with it,
  * assuming the transformations result in valid PNG data.
  */
-void
+void /* PRIVATE */
 png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_transform_info\n");
@@ -998,11 +1028,18 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 
 #if defined(PNG_READ_GAMMA_SUPPORTED)
    if (png_ptr->transformations & PNG_GAMMA)
+   {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
       info_ptr->gamma = png_ptr->gamma;
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+      info_ptr->int_gamma = png_ptr->int_gamma;
+#endif
+   }
+#endif
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-   if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16)
+   if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
       info_ptr->bit_depth = 8;
 #endif
 
@@ -1019,7 +1056,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED)
-   if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8)
+   if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
       info_ptr->bit_depth = 8;
 #endif
 
@@ -1050,13 +1087,19 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
 
 #if defined(PNG_READ_FILLER_SUPPORTED)
    /* STRIP_ALPHA and FILLER allowed:  MASK_ALPHA bit stripped above */
-   if (png_ptr->transformations & PNG_FILLER &&
-       (info_ptr->color_type == PNG_COLOR_TYPE_RGB ||
-        info_ptr->color_type == PNG_COLOR_TYPE_GRAY))
+   if ((png_ptr->transformations & PNG_FILLER) &&
+       ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
+       (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
+   {
       info_ptr->channels++;
+#if 0 /* if adding a true alpha channel not just filler */
+      info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#endif
+   }
 #endif
 
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
+defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
    if(png_ptr->transformations & PNG_USER_TRANSFORM)
      {
        if(info_ptr->bit_depth < png_ptr->user_transform_depth)
@@ -1070,20 +1113,24 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       info_ptr->bit_depth);
    info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
 
+#if !defined(PNG_READ_EXPAND_SUPPORTED)
+   if(png_ptr)
+      return;
+#endif
 }
 
 /* Transform the row.  The order of transformations is significant,
  * and is very touchy.  If you add a transformation, take care to
  * decide how it fits in with the other transformations here.
  */
-void
+void /* PRIVATE */
 png_do_read_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_read_transformations\n");
 #if !defined(PNG_USELESS_TESTS_SUPPORTED)
    if (png_ptr->row_buf == NULL)
    {
-#if !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char msg[50];
 
       sprintf(msg, "NULL row buffer for row %ld, pass %d", png_ptr->row_number,
@@ -1170,7 +1217,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
    /* if gray -> RGB, do so now only if background is non-gray; else do later
     * for performance reasons */
-   if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
        !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
       png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
@@ -1244,8 +1291,8 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
 
 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
    /* if gray -> RGB, do so now only if we did not do so above */
-   if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
-       png_ptr->mode & PNG_BACKGROUND_IS_GRAY)
+   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+       (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
       png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
 
@@ -1284,13 +1331,15 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
              /*  png_byte channels;          number of channels (1-4) */
              /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
            png_ptr->row_buf + 1);      /* start of pixel data for row */
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
       if(png_ptr->user_transform_depth)
          png_ptr->row_info.bit_depth = png_ptr->user_transform_depth;
       if(png_ptr->user_transform_channels)
          png_ptr->row_info.channels = png_ptr->user_transform_channels;
+#endif
       png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
          png_ptr->row_info.channels);
-      png_ptr->row_info.rowbytes = (png_ptr->row_info.width * 
+      png_ptr->row_info.rowbytes = (png_ptr->row_info.width *
          png_ptr->row_info.pixel_depth+7)>>3;
    }
 #endif
@@ -1304,7 +1353,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
  * the numbers 0 or 1.  If you would rather they contain 0 and 255, use
  * png_do_shift() after this.
  */
-void
+void /* PRIVATE */
 png_do_unpack(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_unpack\n");
@@ -1323,10 +1372,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
             png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = 7 - (int)((row_width + 7) & 7);
+            png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
             for (i = 0; i < row_width; i++)
             {
-               *dp = (png_byte)((*sp >> shift) & 0x1);
+               *dp = (png_byte)((*sp >> shift) & 0x01);
                if (shift == 7)
                {
                   shift = 0;
@@ -1344,10 +1393,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
 
             png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
             png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+            png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
             for (i = 0; i < row_width; i++)
             {
-               *dp = (png_byte)((*sp >> shift) & 0x3);
+               *dp = (png_byte)((*sp >> shift) & 0x03);
                if (shift == 6)
                {
                   shift = 0;
@@ -1364,10 +1413,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
             png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+            png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
             for (i = 0; i < row_width; i++)
             {
-               *dp = (png_byte)((*sp >> shift) & 0xf);
+               *dp = (png_byte)((*sp >> shift) & 0x0f);
                if (shift == 4)
                {
                   shift = 0;
@@ -1394,7 +1443,7 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
  * a row of bit depth 8, but only 5 are significant, this will shift
  * the values back to 0 through 31.
  */
-void
+void /* PRIVATE */
 png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
 {
    png_debug(1, "in png_do_unshift\n");
@@ -1500,7 +1549,7 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
 /* chop rows of bit depth 16 down to 8 */
-void
+void /* PRIVATE */
 png_do_chop(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_chop\n");
@@ -1554,7 +1603,7 @@ png_do_chop(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
 png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_read_swap_alpha\n");
@@ -1646,7 +1695,7 @@ png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
 png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_read_invert_alpha\n");
@@ -1667,9 +1716,15 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
             for (i = 0; i < row_width; i++)
             {
                *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=3;
+               dp=sp;
             }
          }
          /* This inverts the alpha channel in RRGGBBAA */
@@ -1683,12 +1738,18 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
             {
                *(--dp) = (png_byte)(255 - *(--sp));
                *(--dp) = (png_byte)(255 - *(--sp));
+
+/*             This does nothing:
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
+               We can replace it with:
+*/
+               sp-=6;
+               dp=sp;
             }
          }
       }
@@ -1718,8 +1779,12 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
             {
                *(--dp) = (png_byte)(255 - *(--sp));
                *(--dp) = (png_byte)(255 - *(--sp));
+/*
                *(--dp) = *(--sp);
                *(--dp) = *(--sp);
+*/
+               sp-=2;
+               dp=sp;
             }
          }
       }
@@ -1729,7 +1794,7 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
 
 #if defined(PNG_READ_FILLER_SUPPORTED)
 /* Add filler channel if we have RGB color */
-void
+void /* PRIVATE */
 png_do_read_filler(png_row_infop row_info, png_bytep row,
    png_uint_32 filler, png_uint_32 flags)
 {
@@ -1905,7 +1970,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
 
 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
 /* expand grayscale files to RGB, with or without alpha */
-void
+void /* PRIVATE */
 png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
 {
    png_uint_32 i;
@@ -1988,7 +2053,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-/* reduce RGB files to grayscale, with or without alpha 
+/* reduce RGB files to grayscale, with or without alpha
  * using the equation given in Poynton's ColorFAQ at
  * <http://www.inforamp.net/~poynton/>
  * Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
@@ -1996,18 +2061,18 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
  *     Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
  *
  *  We approximate this with
- * 
- *     Y = 0.211 * R    + 0.715 * G    + 0.074 * B
+ *
+ *     Y = 0.21268 * R    + 0.7151 * G    + 0.07217 * B
  *
  *  which can be expressed with integers as
  *
- *     Y = (54 * R + 183 * G + 19 * B)/256
+ *     Y = (6969 * R + 23434 * G + 2365 * B)/32768
  *
  *  The calculation is to be done in a linear colorspace.
  *
  *  Other integer coefficents can be used via png_set_rgb_to_gray().
  */
-int
+int /* PRIVATE */
 png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
 
 {
@@ -2023,9 +2088,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
 #endif
       (row_info->color_type & PNG_COLOR_MASK_COLOR))
    {
-      png_byte rc = png_ptr->rgb_to_gray_red_coeff;
-      png_byte gc = png_ptr->rgb_to_gray_green_coeff;
-      png_byte bc = png_ptr->rgb_to_gray_blue_coeff;
+      png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
+      png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
+      png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;
 
       if (row_info->color_type == PNG_COLOR_TYPE_RGB)
       {
@@ -2046,7 +2111,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                   {
                      rgb_error |= 1;
                      *(dp++) = png_ptr->gamma_from_1[
-                       (rc*red+gc*green+bc*blue)>>8];
+                       (rc*red+gc*green+bc*blue)>>15];
                   }
                   else
                      *(dp++) = *(sp-1);
@@ -2065,14 +2130,14 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                   if(red != green || red != blue)
                   {
                      rgb_error |= 1;
-                     *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>8);
+                     *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15);
                   }
                   else
                      *(dp++) = *(sp-1);
                }
             }
          }
- 
+
          else /* RGB bit_depth == 16 */
          {
 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
@@ -2097,15 +2162,15 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                                   png_ptr->gamma_shift][red>>8];
                      png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
                                   png_ptr->gamma_shift][green>>8];
-                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >> 
+                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
                                   png_ptr->gamma_shift][blue>>8];
                      png_uint_16 gray16  = (png_uint_16)((rc*red_1 + gc*green_1
-                                  + bc*blue_1)>>8);
+                                  + bc*blue_1)>>15);
                      w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
                          png_ptr->gamma_shift][gray16 >> 8];
                      rgb_error |= 1;
                   }
-                  
+
                   *(dp++) = (png_byte)((w>>8) & 0xff);
                   *(dp++) = (png_byte)(w & 0xff);
                }
@@ -2125,7 +2190,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
 
                   if(red != green || red != blue)
                      rgb_error |= 1;
-                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
                   *(dp++) = (png_byte)((gray16>>8) & 0xff);
                   *(dp++) = (png_byte)(gray16 & 0xff);
                }
@@ -2149,7 +2214,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                   if(red != green || red != blue)
                      rgb_error |= 1;
                   *(dp++) =  png_ptr->gamma_from_1
-                             [(rc*red + gc*green + bc*blue)>>8];
+                             [(rc*red + gc*green + bc*blue)>>15];
                   *(dp++) = *(sp++);  /* alpha */
                }
             }
@@ -2194,15 +2259,15 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                                   png_ptr->gamma_shift][red>>8];
                      png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
                                   png_ptr->gamma_shift][green>>8];
-                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >> 
+                     png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue&0xff) >>
                                   png_ptr->gamma_shift][blue>>8];
                      png_uint_16 gray16  = (png_uint_16)((rc * red_1
-                                  + gc * green_1 + bc * blue_1)>>8);
+                                  + gc * green_1 + bc * blue_1)>>15);
                      w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
                          png_ptr->gamma_shift][gray16 >> 8];
                      rgb_error |= 1;
                   }
-                  
+
                   *(dp++) = (png_byte)((w>>8) & 0xff);
                   *(dp++) = (png_byte)(w & 0xff);
                   *(dp++) = *(sp++);  /* alpha */
@@ -2222,7 +2287,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                   blue  = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
                   if(red != green || red != blue)
                      rgb_error |= 1;
-                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
+                  gray16  = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
                   *(dp++) = (png_byte)((gray16>>8) & 0xff);
                   *(dp++) = (png_byte)(gray16 & 0xff);
                   *(dp++) = *(sp++);  /* alpha */
@@ -2247,7 +2312,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
  * paletted.  Most useful for gamma correction and simplification
  * of code.
  */
-void
+void /* PRIVATE */
 png_build_grayscale_palette(int bit_depth, png_colorp palette)
 {
    int num_palette;
@@ -2293,12 +2358,13 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette)
 
 /* This function is currently unused.  Do we really need it? */
 #if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED)
-void
+void /* PRIVATE */
 png_correct_palette(png_structp png_ptr, png_colorp palette,
    int num_palette)
 {
    png_debug(1, "in png_correct_palette\n");
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+    defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
    if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
    {
       png_color back, back_1;
@@ -2477,7 +2543,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette,
  * "background" is already in the screen gamma, while "background_1" is
  * at a gamma of 1.0.  Paletted files have already been taken care of.
  */
-void
+void /* PRIVATE */
 png_do_background(png_row_infop row_info, png_bytep row,
    png_color_16p trans_values, png_color_16p background,
    png_color_16p background_1,
@@ -2510,7 +2576,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                   shift = 7;
                   for (i = 0; i < row_width; i++)
                   {
-                     if ((png_uint_16)((*sp >> shift) & 0x1)
+                     if ((png_uint_16)((*sp >> shift) & 0x01)
                         == trans_values->gray)
                      {
                         *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
@@ -2535,7 +2601,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      shift = 6;
                      for (i = 0; i < row_width; i++)
                      {
-                        if ((png_uint_16)((*sp >> shift) & 0x3)
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
                             == trans_values->gray)
                         {
                            *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@@ -2543,9 +2609,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         }
                         else
                         {
-                           png_byte p = (png_byte)((*sp >> shift) & 0x3);
+                           png_byte p = (png_byte)((*sp >> shift) & 0x03);
                            png_byte g = (png_byte)((gamma_table [p | (p << 2) |
-                               (p << 4) | (p << 6)] >> 6) & 0x3);
+                               (p << 4) | (p << 6)] >> 6) & 0x03);
                            *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
                            *sp |= (png_byte)(g << shift);
                         }
@@ -2565,7 +2631,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      shift = 6;
                      for (i = 0; i < row_width; i++)
                      {
-                        if ((png_uint_16)((*sp >> shift) & 0x3)
+                        if ((png_uint_16)((*sp >> shift) & 0x03)
                             == trans_values->gray)
                         {
                            *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@@ -2591,7 +2657,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      shift = 4;
                      for (i = 0; i < row_width; i++)
                      {
-                        if ((png_uint_16)((*sp >> shift) & 0xf)
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
                             == trans_values->gray)
                         {
                            *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@@ -2599,9 +2665,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         }
                         else
                         {
-                           png_byte p = (png_byte)((*sp >> shift) & 0xf);
+                           png_byte p = (png_byte)((*sp >> shift) & 0x0f);
                            png_byte g = (png_byte)((gamma_table[p |
-                             (p << 4)] >> 4) & 0xf);
+                             (p << 4)] >> 4) & 0x0f);
                            *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
                            *sp |= (png_byte)(g << shift);
                         }
@@ -2621,7 +2687,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      shift = 4;
                      for (i = 0; i < row_width; i++)
                      {
-                        if ((png_uint_16)((*sp >> shift) & 0xf)
+                        if ((png_uint_16)((*sp >> shift) & 0x0f)
                             == trans_values->gray)
                         {
                            *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@@ -3148,7 +3214,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
  * is 16, use gamma_16_table and gamma_shift.  Build these with
  * build_gamma_table().
  */
-void
+void /* PRIVATE */
 png_do_gamma(png_row_infop row_info, png_bytep row,
    png_bytep gamma_table, png_uint_16pp gamma_16_table,
    int gamma_shift)
@@ -3330,7 +3396,7 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
 /* Expands a palette row to an RGB or RGBA row depending
  * upon whether you supply trans and num_trans.
  */
-void
+void /* PRIVATE */
 png_do_expand_palette(png_row_infop row_info, png_bytep row,
    png_colorp palette, png_bytep trans, int num_trans)
 {
@@ -3354,10 +3420,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
             {
                sp = row + (png_size_t)((row_width - 1) >> 3);
                dp = row + (png_size_t)row_width - 1;
-               shift = 7 - (int)((row_width + 7) & 7);
+               shift = 7 - (int)((row_width + 7) & 0x07);
                for (i = 0; i < row_width; i++)
                {
-                  if ((*sp >> shift) & 0x1)
+                  if ((*sp >> shift) & 0x01)
                      *dp = 1;
                   else
                      *dp = 0;
@@ -3377,10 +3443,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
             {
                sp = row + (png_size_t)((row_width - 1) >> 2);
                dp = row + (png_size_t)row_width - 1;
-               shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+               shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
                for (i = 0; i < row_width; i++)
                {
-                  value = (*sp >> shift) & 0x3;
+                  value = (*sp >> shift) & 0x03;
                   *dp = (png_byte)value;
                   if (shift == 6)
                   {
@@ -3398,10 +3464,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
             {
                sp = row + (png_size_t)((row_width - 1) >> 1);
                dp = row + (png_size_t)row_width - 1;
-               shift = (int)((row_width & 1) << 2);
+               shift = (int)((row_width & 0x01) << 2);
                for (i = 0; i < row_width; i++)
                {
-                  value = (*sp >> shift) & 0xf;
+                  value = (*sp >> shift) & 0x0f;
                   *dp = (png_byte)value;
                   if (shift == 4)
                   {
@@ -3473,7 +3539,7 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
 /* If the bit depth < 8, it is expanded to 8.  Also, if the
  * transparency value is supplied, an alpha channel is built.
  */
-void
+void /* PRIVATE */
 png_do_expand(png_row_infop row_info, png_bytep row,
    png_color_16p trans_value)
 {
@@ -3500,10 +3566,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                   gray = (png_uint_16)(gray*0xff);
                   sp = row + (png_size_t)((row_width - 1) >> 3);
                   dp = row + (png_size_t)row_width - 1;
-                  shift = 7 - (int)((row_width + 7) & 7);
+                  shift = 7 - (int)((row_width + 7) & 0x07);
                   for (i = 0; i < row_width; i++)
                   {
-                     if ((*sp >> shift) & 0x1)
+                     if ((*sp >> shift) & 0x01)
                         *dp = 0xff;
                      else
                         *dp = 0;
@@ -3524,10 +3590,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                   gray = (png_uint_16)(gray*0x55);
                   sp = row + (png_size_t)((row_width - 1) >> 2);
                   dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+                  shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
                   for (i = 0; i < row_width; i++)
                   {
-                     value = (*sp >> shift) & 0x3;
+                     value = (*sp >> shift) & 0x03;
                      *dp = (png_byte)(value | (value << 2) | (value << 4) |
                         (value << 6));
                      if (shift == 6)
@@ -3547,10 +3613,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                   gray = (png_uint_16)(gray*0x11);
                   sp = row + (png_size_t)((row_width - 1) >> 1);
                   dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+                  shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
                   for (i = 0; i < row_width; i++)
                   {
-                     value = (*sp >> shift) & 0xf;
+                     value = (*sp >> shift) & 0x0f;
                      *dp = (png_byte)(value | (value << 4));
                      if (shift == 4)
                      {
@@ -3672,7 +3738,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
 #endif
 
 #if defined(PNG_READ_DITHER_SUPPORTED)
-void
+void /* PRIVATE */
 png_do_dither(png_row_infop row_info, png_bytep row,
     png_bytep palette_lookup, png_bytep dither_lookup)
 {
@@ -3764,6 +3830,7 @@ png_do_dither(png_row_infop row_info, png_bytep row,
 }
 #endif
 
+#ifdef PNG_FLOATING_POINT_SUPPORTED
 #if defined(PNG_READ_GAMMA_SUPPORTED)
 static int png_gamma_shift[] =
    {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0};
@@ -3773,7 +3840,7 @@ static int png_gamma_shift[] =
  * the future.  Note also how the gamma_16 tables are segmented so that
  * we don't need to allocate > 64K chunks for a full 16-bit table.
  */
-void
+void /* PRIVATE */
 png_build_gamma_table(png_structp png_ptr)
 {
   png_debug(1, "in png_build_gamma_table\n");
@@ -3800,7 +3867,7 @@ png_build_gamma_table(png_structp png_ptr)
 
 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
     defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
+      if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
       {
 
          g = 1.0 / (png_ptr->gamma);
@@ -3814,7 +3881,7 @@ png_build_gamma_table(png_structp png_ptr)
                g) * 255.0 + .5);
          }
 
-         
+
          png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
             (png_uint_32)256);
 
@@ -3983,4 +4050,66 @@ png_build_gamma_table(png_structp png_ptr)
  }
 }
 #endif
+/* To do: install integer version of png_build_gamma_table here */
+#endif
 
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(65536+s0+s1)&0xffff;
+            png_uint_32 blue=(65536+s2+s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */

pngset.c

@@ -1,11 +1,11 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data
@@ -16,8 +16,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
-void
+#if defined(PNG_bKGD_SUPPORTED)
+void PNGAPI
 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
 {
    png_debug1(1, "in %s storage function\n", "bKGD");
@@ -29,8 +29,9 @@ png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
 }
 #endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
-void
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    double white_x, double white_y, double red_x, double red_y,
    double green_x, double green_y, double blue_x, double blue_y)
@@ -47,12 +48,56 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    info_ptr->y_green = (float)green_y;
    info_ptr->x_blue  = (float)blue_x;
    info_ptr->y_blue  = (float)blue_y;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
+   info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
+   info_ptr->int_x_red   = (png_fixed_point)(red_x*100000.+0.5);
+   info_ptr->int_y_red   = (png_fixed_point)(red_y*100000.+0.5);
+   info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
+   info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
+   info_ptr->int_x_blue  = (png_fixed_point)(blue_x*100000.+0.5);
+   info_ptr->int_y_blue  = (png_fixed_point)(blue_y*100000.+0.5);
+#endif
    info_ptr->valid |= PNG_INFO_cHRM;
 }
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+   png_fixed_point blue_x, png_fixed_point blue_y)
+{
+   png_debug1(1, "in %s storage function\n", "cHRM");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
 
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-void
+   info_ptr->int_x_white = white_x;
+   info_ptr->int_y_white = white_y;
+   info_ptr->int_x_red   = red_x;
+   info_ptr->int_y_red   = red_y;
+   info_ptr->int_x_green = green_x;
+   info_ptr->int_y_green = green_y;
+   info_ptr->int_x_blue  = blue_x;
+   info_ptr->int_y_blue  = blue_y;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   info_ptr->x_white = (float)(white_x/100000.);
+   info_ptr->y_white = (float)(white_y/100000.);
+   info_ptr->x_red   = (float)(red_x/100000.);
+   info_ptr->y_red   = (float)(red_y/100000.);
+   info_ptr->x_green = (float)(green_x/100000.);
+   info_ptr->y_green = (float)(green_y/100000.);
+   info_ptr->x_blue  = (float)(blue_x/100000.);
+   info_ptr->y_blue  = (float)(blue_y/100000.);
+#endif
+   info_ptr->valid |= PNG_INFO_cHRM;
+}
+#endif
+#endif
+
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 {
    png_debug1(1, "in %s storage function\n", "gAMA");
@@ -60,24 +105,70 @@ png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
       return;
 
    info_ptr->gamma = (float)file_gamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_gamma = (int)(file_gamma*100000.+.5);
+#endif
    info_ptr->valid |= PNG_INFO_gAMA;
+   if(file_gamma == 0.0)
+      png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
-
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
-void
-png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+void PNGAPI
+png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
+   int_gamma)
 {
-   png_debug1(1, "in %s storage function\n", "hIST");
+   png_debug1(1, "in %s storage function\n", "gAMA");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->hist = hist;
-   info_ptr->valid |= PNG_INFO_hIST;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   info_ptr->gamma = (float)(int_gamma/100000.);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   info_ptr->int_gamma = int_gamma;
+#endif
+   info_ptr->valid |= PNG_INFO_gAMA;
+   if(int_gamma == 0)
+      png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
 
-void
+#if defined(PNG_hIST_SUPPORTED)
+void PNGAPI
+png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+{
+   int	i;
+
+   png_debug1(1, "in %s storage function\n", "hIST");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   if (info_ptr->num_palette == 0)
+   {
+       png_warning(png_ptr,
+          "Palette size 0, hIST allocation skipped.");
+       return;
+   }
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+#endif
+   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
+      (png_uint_32)(info_ptr->num_palette * sizeof (png_uint_16)));
+
+   for (i = 0; i < info_ptr->num_palette; i++)
+       png_ptr->hist[i] = hist[i];
+   info_ptr->hist = png_ptr->hist;
+   info_ptr->valid |= PNG_INFO_hIST;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_HIST;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_HIST;
+#endif
+}
+#endif
+
+void PNGAPI
 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 width, png_uint_32 height, int bit_depth,
    int color_type, int interlace_type, int compression_type,
@@ -88,6 +179,61 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   /* check for width and height valid values */
+   if (width == 0 || height == 0)
+      png_error(png_ptr, "Image width or height is zero in IHDR");
+   if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
+      png_error(png_ptr, "Invalid image size in IHDR");
+
+   /* check other values */
+   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+      bit_depth != 8 && bit_depth != 16)
+      png_error(png_ptr, "Invalid bit depth in IHDR");
+
+   if (color_type < 0 || color_type == 1 ||
+      color_type == 5 || color_type > 6)
+      png_error(png_ptr, "Invalid color type in IHDR");
+
+   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+       ((color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
+
+   if (interlace_type >= PNG_INTERLACE_LAST)
+      png_error(png_ptr, "Unknown interlace method in IHDR");
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+      png_error(png_ptr, "Unknown compression method in IHDR");
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+   if(filter_type != PNG_FILTER_TYPE_BASE)
+   {
+     if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+        (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+        ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+        (color_type == PNG_COLOR_TYPE_RGB || 
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+        png_error(png_ptr, "Unknown filter method in IHDR");
+     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
+        png_warning(png_ptr, "Invalid filter method in IHDR");
+   }
+#else
+   if(filter_type != PNG_FILTER_TYPE_BASE)
+      png_error(png_ptr, "Unknown filter method in IHDR");
+#endif
+
    info_ptr->width = width;
    info_ptr->height = height;
    info_ptr->bit_depth = (png_byte)bit_depth;
@@ -117,10 +263,10 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
       info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
 }
 
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-void
+#if defined(PNG_oFFs_SUPPORTED)
+void PNGAPI
 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
+   png_int_32 offset_x, png_int_32 offset_y, int unit_type)
 {
    png_debug1(1, "in %s storage function\n", "oFFs");
    if (png_ptr == NULL || info_ptr == NULL)
@@ -133,8 +279,8 @@ png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
-void
+#if defined(PNG_pCAL_SUPPORTED)
+void PNGAPI
 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
    png_charp units, png_charpp params)
@@ -147,7 +293,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
       return;
 
    length = png_strlen(purpose) + 1;
-   png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
+   png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
    info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 
@@ -158,28 +304,81 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    info_ptr->pcal_nparams = (png_byte)nparams;
 
    length = png_strlen(units) + 1;
-   png_debug1(3, "allocating units for info (%d bytes)\n", length);
+   png_debug1(3, "allocating units for info (%lu bytes)\n", length);
    info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 
    info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
       (png_uint_32)((nparams + 1) * sizeof(png_charp)));
+
    info_ptr->pcal_params[nparams] = NULL;
 
    for (i = 0; i < nparams; i++)
    {
       length = png_strlen(params[i]) + 1;
-      png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
+      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
       info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
 
    info_ptr->valid |= PNG_INFO_pCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PCAL;
+#endif
 }
 #endif
 
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-void
+#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
+             int unit, double width, double height)
+{
+   png_debug1(1, "in %s storage function\n", "sCAL");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->scal_unit = (png_byte)unit;
+   info_ptr->scal_pixel_width = width;
+   info_ptr->scal_pixel_height = height;
+
+   info_ptr->valid |= PNG_INFO_sCAL;
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+             int unit, png_charp swidth, png_charp sheight)
+{
+   png_uint_32 length;
+
+   png_debug1(1, "in %s storage function\n", "sCAL");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   info_ptr->scal_unit = (png_byte)unit;
+
+   length = png_strlen(swidth) + 1;
+   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
+   info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
+   png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
+
+   length = png_strlen(sheight) + 1;
+   png_debug1(3, "allocating unit for info (%d bytes)\n", length);
+   info_ptr->scal_s_height = (png_charp)png_malloc(png_ptr, length);
+   png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
+
+   info_ptr->valid |= PNG_INFO_sCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_SCAL;
+#endif
+}
+#endif
+#endif
+#endif
+
+#if defined(PNG_pHYs_SUPPORTED)
+void PNGAPI
 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 {
@@ -194,21 +393,40 @@ png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-void
+void PNGAPI
 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    png_colorp palette, int num_palette)
 {
+
    png_debug1(1, "in %s storage function\n", "PLTE");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->palette = palette;
-   info_ptr->num_palette = (png_uint_16)num_palette;
+   /*
+    * It may not actually be necessary to set png_ptr->palette here;
+    * we do it for backward compatibility with the way the png_handle_tRNS
+    * function used to do the allocation.
+    */
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
+#endif
+   png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
+      sizeof (png_color));
+   png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
+   info_ptr->palette = png_ptr->palette;
+   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PLTE;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
+#endif
+
    info_ptr->valid |= PNG_INFO_PLTE;
 }
 
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
-void
+#if defined(PNG_sBIT_SUPPORTED)
+void PNGAPI
 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
    png_color_8p sig_bit)
 {
@@ -221,8 +439,8 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
-void
+#if defined(PNG_sRGB_SUPPORTED)
+void PNGAPI
 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
 {
    png_debug1(1, "in %s storage function\n", "sRGB");
@@ -232,15 +450,27 @@ png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
    info_ptr->srgb_intent = (png_byte)intent;
    info_ptr->valid |= PNG_INFO_sRGB;
 }
-void
+
+void PNGAPI
 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
    int intent)
 {
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    float file_gamma;
 #endif
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_fixed_point int_file_gamma;
+#endif
+#endif
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+      int_green_y, int_blue_x, int_blue_y;
+#endif
 #endif
    png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
    if (png_ptr == NULL || info_ptr == NULL)
@@ -248,12 +478,33 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 
    png_set_sRGB(png_ptr, info_ptr, intent);
 
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    file_gamma = (float).45455;
    png_set_gAMA(png_ptr, info_ptr, file_gamma);
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   int_file_gamma = 45455L;
+   png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
+#endif
+#endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   int_white_x = 31270L;
+   int_white_y = 32900L;
+   int_red_x   = 64000L;
+   int_red_y   = 33000L;
+   int_green_x = 30000L;
+   int_green_y = 60000L;
+   int_blue_x  = 15000L;
+   int_blue_y  =  6000L;
+
+   png_set_cHRM_fixed(png_ptr, info_ptr,
+      int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
+      int_blue_x, int_blue_y);
+#endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    white_x = (float).3127;
    white_y = (float).3290;
    red_x   = (float).64;
@@ -265,14 +516,47 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 
    png_set_cHRM(png_ptr, info_ptr,
       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
-
+#endif
 #endif
 }
 #endif
 
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
-void
+
+#if defined(PNG_iCCP_SUPPORTED)
+void PNGAPI
+png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
+             png_charp name, int compression_type,
+             png_charp profile, png_uint_32 proflen)
+{
+   png_charp new_iccp_name;
+   png_charp new_iccp_profile;
+
+   png_debug1(1, "in %s storage function\n", "iCCP");
+   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
+      return;
+
+   new_iccp_name = (png_charp)png_malloc(png_ptr, png_strlen(name)+1);
+   png_strcpy(new_iccp_name, name);
+   new_iccp_profile = (png_charp)png_malloc(png_ptr, proflen);
+   png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
+
+   info_ptr->iccp_proflen = proflen;
+   info_ptr->iccp_name = new_iccp_name;
+   info_ptr->iccp_profile = new_iccp_profile;
+   /* Compression is always zero but is here so the API and info structure
+    * does not have to change if we introduce multiple compression types */
+   info_ptr->iccp_compression = (png_byte)compression_type;
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_ICCP;
+#endif
+   info_ptr->valid |= PNG_INFO_iCCP;
+}
+#endif
+
+#if defined(PNG_TEXT_SUPPORTED)
+void PNGAPI
 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
    int num_text)
 {
@@ -309,52 +593,113 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          info_ptr->num_text = 0;
          info_ptr->text = (png_textp)png_malloc(png_ptr,
             (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+#ifdef PNG_FREE_ME_SUPPORTED
+         info_ptr->free_me |= PNG_FREE_TEXT;
+#endif
       }
       png_debug1(3, "allocated %d entries for info_ptr->text\n",
          info_ptr->max_text);
    }
-
    for (i = 0; i < num_text; i++)
    {
+      png_size_t text_length,key_len;
+      png_size_t lang_len,lang_key_len;
       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
-      png_charp key,text;
 
-      if (text_ptr[i].key == (png_charp)NULL)
-         continue;
+      if (text_ptr[i].key == NULL)
+          continue;
 
-      if (text_ptr[i].text[0] == '\0')
+      key_len = png_strlen(text_ptr[i].key);
+
+      if(text_ptr[i].compression <= 0)
       {
-         textp->text_length = 0;
-         textp->compression = PNG_TEXT_COMPRESSION_NONE;
+        lang_len = 0;
+        lang_key_len = 0;
+      }
+      else
+#ifdef PNG_iTXt_SUPPORTED
+      {
+        /* set iTXt data */
+        if (text_ptr[i].key != NULL)
+          lang_len = png_strlen(text_ptr[i].lang);
+        else
+          lang_len = 0;
+        if (text_ptr[i].lang_key != NULL)
+          lang_key_len = png_strlen(text_ptr[i].lang_key);
+        else
+          lang_key_len = 0;
+      }
+#else
+      {
+        png_warning(png_ptr, "iTXt chunk not supported.");
+        continue;
+      }
+#endif
+
+      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
+      {
+         text_length = 0;
+#ifdef PNG_iTXt_SUPPORTED
+         if(text_ptr[i].compression > 0)
+            textp->compression = PNG_ITXT_COMPRESSION_NONE;
+         else
+#endif
+            textp->compression = PNG_TEXT_COMPRESSION_NONE;
       }
       else
       {
-         textp->text_length = png_strlen(text_ptr[i].text);
+         text_length = png_strlen(text_ptr[i].text);
          textp->compression = text_ptr[i].compression;
       }
-      key=text_ptr[i].key;
-      for (text = key; *text++;)
-        /* empty loop to find the byte after the zero byte after the
-           end of key */ ;
 
       textp->key = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(text+textp->text_length - key)+1);
-      /* Caution: the calling program, not libpng, is responsible for
-         freeing this, if libpng wasn't the caller. */
-      png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
-         text+textp->text_length-key+1, textp->key);
+         (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
+      png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
+         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
+         (int)textp->key);
 
       png_memcpy(textp->key, text_ptr[i].key,
-         (png_size_t)(text - key));  /* includes the zero-byte separator */
-      textp->text = textp->key + (text-key);
-      if(textp->text_length)
+         (png_size_t)(key_len));
+      *(textp->key+key_len) = '\0';
+#ifdef PNG_iTXt_SUPPORTED
+      if (text_ptr[i].compression > 0)
       {
-         png_memcpy(textp->text, text_ptr[i].text,
-            (png_size_t)(textp->text_length));
-         *(textp->text+textp->text_length) = '\0';
+         textp->lang=textp->key + key_len + 1;
+         png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+         *(textp->lang+lang_len) = '\0';
+         textp->lang_key=textp->lang + lang_len + 1;
+         png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+         *(textp->lang_key+lang_key_len) = '\0';
+         textp->text=textp->lang_key + lang_key_len + 1;
       }
       else
-         textp->text--;
+#endif
+      {
+#ifdef PNG_iTXt_SUPPORTED
+         textp->lang=(png_charp)NULL;
+         textp->lang_key=(png_charp)NULL;
+#endif
+         textp->text=textp->key + key_len + 1;
+      }
+      if(text_length)
+         png_memcpy(textp->text, text_ptr[i].text,
+            (png_size_t)(text_length));
+      *(textp->text+text_length) = '\0';
+
+#ifdef PNG_iTXt_SUPPORTED
+      if(textp->compression > 0)
+      {
+         textp->text_length = 0;
+         textp->itxt_length = text_length;
+      }
+      else
+#endif
+      {
+         textp->text_length = text_length;
+#ifdef PNG_iTXt_SUPPORTED
+         textp->itxt_length = 0;
+#endif
+      }
       info_ptr->text[info_ptr->num_text]= *textp;
       info_ptr->num_text++;
       png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
@@ -362,8 +707,8 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 }
 #endif
 
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-void
+#if defined(PNG_tIME_SUPPORTED)
+void PNGAPI
 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 {
    png_debug1(1, "in %s storage function\n", "tIME");
@@ -376,8 +721,8 @@ png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 }
 #endif
 
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
-void
+#if defined(PNG_tRNS_SUPPORTED)
+void PNGAPI
 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep trans, int num_trans, png_color_16p trans_values)
 {
@@ -387,7 +732,22 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 
    if (trans != NULL)
    {
-      info_ptr->trans = trans;
+       /*
+	* It may not actually be necessary to set png_ptr->trans here;
+	* we do it for backward compatibility with the way the png_handle_tRNS
+	* function used to do the allocation.
+	*/
+#ifdef PNG_FREE_ME_SUPPORTED
+       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+#endif
+       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
+           num_trans);
+       png_memcpy(info_ptr->trans, trans, num_trans);
+#ifdef PNG_FREE_ME_SUPPORTED
+       info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
    }
 
    if (trans_values != NULL)
@@ -402,13 +762,265 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED)
-void
-png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
+#if defined(PNG_sPLT_SUPPORTED)
+void PNGAPI
+png_set_sPLT(png_structp png_ptr,
+             png_infop info_ptr, png_sPLT_tp entries, int nentries)
 {
-   png_debug1(1, "in png_permit_empty_plte\n", "");
-   if (png_ptr == NULL)
-      return;
-   png_ptr->empty_plte_permitted=(png_byte)empty_plte_permitted;
+    png_sPLT_tp np;
+    int i;
+
+    np = (png_sPLT_tp)png_malloc(png_ptr,
+        (info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));
+
+    png_memcpy(np, info_ptr->splt_palettes,
+           info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
+    png_free(png_ptr, info_ptr->splt_palettes);
+    info_ptr->splt_palettes=NULL;
+
+    for (i = 0; i < nentries; i++)
+    {
+        png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
+        png_sPLT_tp from = entries + i;
+
+        to->name = (png_charp)png_malloc(png_ptr,
+            png_strlen(from->name) + 1);
+        png_strcpy(to->name, from->name);
+        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
+            from->nentries * sizeof(png_sPLT_t));
+        png_memcpy(to->entries, from->entries,
+            from->nentries * sizeof(png_sPLT_t));
+        to->nentries = from->nentries;
+        to->depth = from->depth;
+    }
+
+    info_ptr->splt_palettes = np;
+    info_ptr->splt_palettes_num += nentries;
+    info_ptr->valid |= PNG_INFO_sPLT;
+#ifdef PNG_FREE_ME_SUPPORTED
+    info_ptr->free_me |= PNG_FREE_SPLT;
+#endif
+}
+#endif /* PNG_sPLT_SUPPORTED */
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_unknown_chunks(png_structp png_ptr,
+   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
+{
+    png_unknown_chunkp np;
+    int i;
+
+    if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+        return;
+
+    np = (png_unknown_chunkp)png_malloc(png_ptr,
+        (info_ptr->unknown_chunks_num + num_unknowns) *
+        sizeof(png_unknown_chunk));
+
+    png_memcpy(np, info_ptr->unknown_chunks,
+           info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
+    png_free(png_ptr, info_ptr->unknown_chunks);
+    info_ptr->unknown_chunks=NULL;
+
+    for (i = 0; i < num_unknowns; i++)
+    {
+        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+        png_unknown_chunkp from = unknowns + i;
+
+        png_strcpy((png_charp)to->name, (png_charp)from->name);
+        to->data = (png_bytep)png_malloc(png_ptr, from->size);
+        png_memcpy(to->data, from->data, from->size);
+        to->size = from->size;
+
+        /* note our location in the read or write sequence */
+        to->location = (png_byte)(png_ptr->mode & 0xff);
+    }
+
+    info_ptr->unknown_chunks = np;
+    info_ptr->unknown_chunks_num += num_unknowns;
+#ifdef PNG_FREE_ME_SUPPORTED
+    info_ptr->free_me |= PNG_FREE_UNKN;
+#endif
+}
+void PNGAPI
+png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
+   int chunk, int location)
+{
+   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
+         (int)info_ptr->unknown_chunks_num)
+      info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
 #endif
+
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+void PNGAPI
+png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
+{
+   /* This function is deprecated in favor of png_permit_mng_features()
+      and will be removed from libpng-2.0.0 */
+   png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
+   if (png_ptr == NULL)
+      return;
+   png_ptr->mng_features_permitted = (png_byte)
+     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
+     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
+}
+#endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+png_uint_32 PNGAPI
+png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+{
+   png_debug(1, "in png_permit_mng_features\n");
+   if (png_ptr == NULL)
+      return (png_uint_32)0;
+   png_ptr->mng_features_permitted =
+     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+   return (png_uint_32)png_ptr->mng_features_permitted;
+}
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
+   chunk_list, int num_chunks)
+{
+    png_bytep new_list, p;
+    int i, old_num_chunks;
+    if (num_chunks == 0)
+    {
+      if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
+        png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+      else
+        png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+      if(keep == HANDLE_CHUNK_ALWAYS)
+        png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      else
+        png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+      return;
+    }
+    if (chunk_list == NULL)
+      return;
+    old_num_chunks=png_ptr->num_chunk_list;
+    new_list=(png_bytep)png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
+    if(png_ptr->chunk_list != NULL)
+    {
+       png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
+       png_free(png_ptr, png_ptr->chunk_list);
+       png_ptr->chunk_list=NULL;
+    }
+    png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
+    for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
+       *p=(png_byte)keep;
+    png_ptr->num_chunk_list=old_num_chunks+num_chunks;
+    png_ptr->chunk_list=new_list;
+#ifdef PNG_FREE_ME_SUPPORTED
+    png_ptr->free_me |= PNG_FREE_LIST;
+#endif
+}
+#endif
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+   png_user_chunk_ptr read_user_chunk_fn)
+{
+   png_debug(1, "in png_set_read_user_chunk_fn\n");
+   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
+   png_ptr->user_chunk_ptr = user_chunk_ptr;
+}
+#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+{
+   png_debug1(1, "in %s storage function\n", "rows");
+
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+   if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
+      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+   info_ptr->row_pointers = row_pointers;
+   if(row_pointers)
+      info_ptr->valid |= PNG_INFO_IDAT;
+}
+#endif
+
+void PNGAPI
+png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
+{
+    if(png_ptr->zbuf)
+       png_free(png_ptr, png_ptr->zbuf);
+    png_ptr->zbuf_size = (png_size_t)size;
+    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+    png_ptr->zstream.next_out = png_ptr->zbuf;
+    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+}
+
+void PNGAPI
+png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+{
+   if (png_ptr && info_ptr)
+      info_ptr->valid &= ~(mask);
+}
+
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 and should always exist by default */
+void PNGAPI
+png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
+{
+    png_uint_32 settable_asm_flags;
+    png_uint_32 settable_mmx_flags;
+
+    settable_mmx_flags =
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
+#endif
+#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
+                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |
+#endif
+#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
+                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
+                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
+                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
+#endif
+                         0;
+
+    /* could be some non-MMX ones in the future, but not currently: */
+    settable_asm_flags = settable_mmx_flags;
+
+    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
+        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
+    {
+        /* clear all MMX flags if MMX isn't supported */
+        settable_asm_flags &= ~settable_mmx_flags;
+        png_ptr->asm_flags &= ~settable_mmx_flags;
+    }
+
+    /* we're replacing the settable bits with those passed in by the user,
+     * so first zero them out of the master copy, then logical-OR in the
+     * allowed subset that was requested */
+
+    png_ptr->asm_flags &= ~settable_asm_flags;			/* zero them */
+    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);	/* set them */
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 */
+void PNGAPI
+png_set_mmx_thresholds (png_structp png_ptr,
+                        png_byte mmx_bitdepth_threshold,
+                        png_uint_32 mmx_rowbytes_threshold)
+{
+    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
+    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */

pngtrans.c

@@ -1,11 +1,11 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
 
 #define PNG_INTERNAL
@@ -13,7 +13,7 @@
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* turn on BGR-to-RGB mapping */
-void
+void PNGAPI
 png_set_bgr(png_structp png_ptr)
 {
    png_debug(1, "in png_set_bgr\n");
@@ -23,7 +23,7 @@ png_set_bgr(png_structp png_ptr)
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* turn on 16 bit byte swapping */
-void
+void PNGAPI
 png_set_swap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap\n");
@@ -34,7 +34,7 @@ png_set_swap(png_structp png_ptr)
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 /* turn on pixel packing */
-void
+void PNGAPI
 png_set_packing(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packing\n");
@@ -48,7 +48,7 @@ png_set_packing(png_structp png_ptr)
 
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 /* turn on packed pixel swapping */
-void
+void PNGAPI
 png_set_packswap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packswap\n");
@@ -58,7 +58,7 @@ png_set_packswap(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-void
+void PNGAPI
 png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 {
    png_debug(1, "in png_set_shift\n");
@@ -69,7 +69,7 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)
-int
+int PNGAPI
 png_set_interlace_handling(png_structp png_ptr)
 {
    png_debug(1, "in png_set_interlace handling\n");
@@ -89,7 +89,7 @@ png_set_interlace_handling(png_structp png_ptr)
  * for 48-bit input data, as well as to avoid problems with some compilers
  * that don't like bytes as parameters.
  */
-void
+void PNGAPI
 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
    png_debug(1, "in png_set_filler\n");
@@ -122,7 +122,7 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 
 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void PNGAPI
 png_set_swap_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap_alpha\n");
@@ -132,7 +132,7 @@ png_set_swap_alpha(png_structp png_ptr)
 
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void PNGAPI
 png_set_invert_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_alpha\n");
@@ -141,7 +141,7 @@ png_set_invert_alpha(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-void
+void PNGAPI
 png_set_invert_mono(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_mono\n");
@@ -149,7 +149,7 @@ png_set_invert_mono(png_structp png_ptr)
 }
 
 /* invert monochrome grayscale data */
-void
+void /* PRIVATE */
 png_do_invert(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_invert\n");
@@ -174,7 +174,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* swaps byte order on 16 bit depth images */
-void
+void /* PRIVATE */
 png_do_swap(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_swap\n");
@@ -305,7 +305,7 @@ static png_byte fourbppswaptable[256] = {
 };
 
 /* swaps pixel packing order within bytes */
-void
+void /* PRIVATE */
 png_do_packswap(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_packswap\n");
@@ -337,7 +337,7 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 /* remove filler or alpha byte(s) */
-void
+void /* PRIVATE */
 png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 {
    png_debug(1, "in png_do_strip_filler\n");
@@ -392,11 +392,12 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                sp += 8; dp += 6;
                for (i = 1; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
                   *dp++ = *sp++;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -411,11 +412,12 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
                for (i = 0; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
                   sp+=2;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -495,7 +497,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* swaps red and blue bytes within a pixel */
-void
+void /* PRIVATE */
 png_do_bgr(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_bgr\n");
@@ -571,25 +573,39 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-void
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_LEGACY_SUPPORTED)
+void PNGAPI
 png_set_user_transform_info(png_structp png_ptr, png_voidp
    user_transform_ptr, int user_transform_depth, int user_transform_channels)
 {
    png_debug(1, "in png_set_user_transform_info\n");
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    png_ptr->user_transform_ptr = user_transform_ptr;
    png_ptr->user_transform_depth = (png_byte)user_transform_depth;
    png_ptr->user_transform_channels = (png_byte)user_transform_channels;
+#else
+   if(user_transform_ptr || user_transform_depth || user_transform_channels)
+      png_warning(png_ptr,
+        "This version of libpng does not support user transform info");
+#endif
 }
+#endif
 
 /* This function returns a pointer to the user_transform_ptr associated with
  * the user transform functions.  The application should free any memory
  * associated with this pointer before png_write_destroy and png_read_destroy
  * are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_user_transform_ptr(png_structp png_ptr)
 {
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    return ((png_voidp)png_ptr->user_transform_ptr);
-}
+#else
+   if(png_ptr)
+     return (NULL);
+   return (NULL);
 #endif
+}
+

pngtypes.h

@@ -1,31 +0,0 @@
-/* pngtypes.h - array of chunk-types for libpng
- *
- * libpng 1.0.5d - November 29, 1999
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- */
-
-/* Constant strings for known chunk types.  If you need to add a chunk,
- * define the string in png.h and invoke it here.
- */
-
-PNG_IHDR;
-PNG_IDAT;
-PNG_IEND;
-PNG_PLTE;
-PNG_bKGD;
-PNG_cHRM;
-PNG_gAMA;
-PNG_hIST;
-PNG_oFFs;
-PNG_pCAL;
-PNG_pHYs;
-PNG_sBIT;
-PNG_sRGB;
-PNG_tEXt;
-PNG_tIME;
-PNG_tRNS;
-PNG_zTXt;
-

pngvcrd.c

@@ -2,13 +2,22 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
  *
  * Contributed by Nirav Chhatrapati, Intel Corporation, 1998
  * Interface to libpng contributed by Gilles Vollant, 1999
+ * Debugging and cleanup by Greg Roelofs, 2000, 2001
+ *
+ * In png_do_read_interlace() in libpng versions 1.0.3a through 1.0.4d,
+ * a sign error in the post-MMX cleanup code for each pixel_depth resulted
+ * in bad pixels at the beginning of some rows of some images, and also
+ * (due to out-of-range memory reads and writes) caused heap corruption
+ * when compiled with MSVC 6.0.  The error was fixed in version 1.0.4e.
+ *
+ * [png_read_filter_row_mmx_avg() bpp == 2 bugfix, GRR 20000916]
  *
  */
 
@@ -17,22 +26,17 @@
 
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD)
 
-/*
-   One of these might need to be defined.
-#define DISABLE_PNGVCRD_COMBINE
-#define DISABLE_PNGVCRD_INTERLACE
-*/
-
 static int mmx_supported=2;
 
-void
-png_read_filter_row_c(png_structp png_ptr, png_row_infop row_info,
-   png_bytep row, png_bytep prev_row, int filter);
 
-static int mmxsupport()
+int PNGAPI
+png_mmx_support(void)
 {
   int mmx_supported_local = 0;
   _asm {
+    push ebx          //CPUID will trash these
+    push ecx
+    push edx
     pushfd            //Save Eflag to stack
     pop eax           //Get Eflag from stack into eax
     mov ecx, eax      //Make another copy of Eflag in ecx
@@ -70,12 +74,15 @@ static int mmxsupport()
 
 NOT_SUPPORTED:
     mov  eax, mmx_supported_local  //move return value to eax
-
+    pop edx          //CPUID trashed these
+    pop ecx
+    pop ebx
   }
 
   //mmx_supported_local=0; // test code for force don't support MMX
   //printf("MMX : %u (1=MMX supported)\n",mmx_supported_local);
 
+  mmx_supported = mmx_supported_local;
   return mmx_supported_local;
 }
 
@@ -93,25 +100,18 @@ NOT_SUPPORTED:
 /* Use this routine for x86 platform - uses faster MMX routine if machine
    supports MMX */
 
-void
+void /* PRIVATE */
 png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
    const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 #endif
-#ifdef DISABLE_PNGVCRD_COMBINE
-   int save_mmx_supported = mmx_supported;
-#endif
 
    png_debug(1,"in png_combine_row_asm\n");
 
-#ifdef DISABLE_PNGVCRD_COMBINE
-   if ((png_ptr->transformations & PNG_INTERLACE) && png_ptr->pass != 6)
-       mmx_supported = 0;
-   else
-#endif
-       if (mmx_supported == 2)
-           mmx_supported = mmxsupport();
+   if (mmx_supported == 2) {
+       png_mmx_support();
+   }
 
    if (mask == 0xff)
    {
@@ -300,7 +300,7 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 
             __int64 mask0=0x0102040810204080;
 
-            if (mmx_supported)
+            if ( mmx_supported )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -382,6 +382,8 @@ end8:
                incr1 = (disp)*pixel_bytes;
                for (i = initial_val; i < final_val; i += incr1)
                {
+                  if (pixel_bytes > (png_size_t)(final_val-i))
+                    pixel_bytes = (png_size_t)(final_val-i);
                   png_memcpy(dstptr, srcptr, pixel_bytes);
                   srcptr += incr1;
                   dstptr += incr1;
@@ -400,7 +402,7 @@ end8:
             __int64 mask1=0x0101020204040808,
                     mask0=0x1010202040408080;
 
-            if (mmx_supported)
+            if ( mmx_supported )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -493,6 +495,8 @@ end16:
                incr1 = (disp)*pixel_bytes;
                for (i = initial_val; i < final_val; i += incr1)
                {
+                  if (pixel_bytes > (png_size_t)(final_val-i))
+                    pixel_bytes = (png_size_t)(final_val-i);
                   png_memcpy(dstptr, srcptr, pixel_bytes);
                   srcptr += incr1;
                   dstptr += incr1;
@@ -520,7 +524,7 @@ end16:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
-            if (mmx_supported)
+            if ( mmx_supported )
             {
                _asm
                {
@@ -623,6 +627,8 @@ end24:
                incr1 = (disp)*pixel_bytes;
                for (i = initial_val; i < final_val; i += incr1)
                {
+                  if (pixel_bytes > (png_size_t)(final_val-i))
+                    pixel_bytes = (png_size_t)(final_val-i);
                   png_memcpy(dstptr, srcptr, pixel_bytes);
                   srcptr += incr1;
                   dstptr += incr1;
@@ -651,7 +657,7 @@ end24:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
-            if (mmx_supported)
+            if ( mmx_supported )
             {
                _asm
                {
@@ -762,6 +768,8 @@ end32:
                incr1 = (disp)*pixel_bytes;
                for (i = initial_val; i < final_val; i += incr1)
                {
+                  if (pixel_bytes > (png_size_t)(final_val-i))
+                    pixel_bytes = (png_size_t)(final_val-i);
                   png_memcpy(dstptr, srcptr, pixel_bytes);
                   srcptr += incr1;
                   dstptr += incr1;
@@ -785,7 +793,7 @@ end32:
                     mask1=0x2020202040404040,
                     mask0=0x4040808080808080;
 
-            if (mmx_supported)
+            if ( mmx_supported )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -919,6 +927,8 @@ end48:
                incr1 = (disp)*pixel_bytes;
                for (i = initial_val; i < final_val; i += incr1)
                {
+                  if (pixel_bytes > (png_size_t)(final_val-i))
+                    pixel_bytes = (png_size_t)(final_val-i);
                   png_memcpy(dstptr, srcptr, pixel_bytes);
                   srcptr += incr1;
                   dstptr += incr1;
@@ -947,6 +957,8 @@ end48:
             incr1 = (disp)*pixel_bytes;
             for (i = initial_val; i < final_val; i += incr1)
             {
+               if (pixel_bytes > (png_size_t)(final_val-i))
+                 pixel_bytes = (png_size_t)(final_val-i);
                png_memcpy(dp, sptr, pixel_bytes);
                sptr += incr1;
                dp += incr1;
@@ -956,43 +968,27 @@ end48:
       } /* end switch (png_ptr->row_info.pixel_depth) */
    } /* end if (non-trivial mask) */
 
-#ifdef DISABLE_PNGVCRD_COMBINE
-   mmx_supported = save_mmx_supported;
-#endif
-
 } /* end png_combine_row() */
 
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
 
-void
-png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
-   png_uint_32 transformations)
+void /* PRIVATE */
+png_do_read_interlace(png_structp png_ptr)
 {
+   png_row_infop row_info = &(png_ptr->row_info);
+   png_bytep row = png_ptr->row_buf + 1;
+   int pass = png_ptr->pass;
+   png_uint_32 transformations = png_ptr->transformations;
 #ifdef PNG_USE_LOCAL_ARRAYS
    const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 #endif
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   int save_mmx_supported = mmx_supported;
-#endif
 
    png_debug(1,"in png_do_read_interlace\n");
 
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   /* In libpng versions 1.0.3a through 1.0.4d,
-    * a sign error in the post-MMX cleanup code for each pixel_depth resulted
-    * in bad pixels at the beginning of some rows of some images, and also
-    * (due to out-of-range memory reads and writes) caused heap corruption
-    * when compiled with MSVC 6.0.  The error was fixed in version 1.0.4e,
-    * and the code appears to work completely correctly, so it is enabled
-    * by default.
-    */
-   if (1)  /* all passes caused a heap problem in the old code */
-      mmx_supported = 0;
-   else
-#endif
-       if (mmx_supported == 2)
-           mmx_supported = mmxsupport();
+   if (mmx_supported == 2) {
+       png_mmx_support();
+   }
 
    if (row != NULL && row_info != NULL)
    {
@@ -1190,7 +1186,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
             // sign fix by GRR
             // NOTE:  there is NO MMX code for 48-bit and 64-bit images
 
-            if (mmx_supported) // use MMX routine if machine supports it
+            // use MMX routine if machine supports it
+            if ( mmx_supported )
             {
                if (pixel_bytes == 3)
                {
@@ -1502,8 +1499,8 @@ loop2_pass0:
                         }
                      }
 
-                     sptr -= (width_mmx*2 - 2);	// sign fixed
-                     dp -= (width_mmx*16 - 2);	// sign fixed
+                     sptr -= (width_mmx*2 - 2);            // sign fixed
+                     dp -= (width_mmx*16 - 2);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1547,8 +1544,8 @@ loop2_pass2:
                         }
                      }
 
-                     sptr -= (width_mmx*2 - 2);	// sign fixed
-                     dp -= (width_mmx*8 - 2);	// sign fixed
+                     sptr -= (width_mmx*2 - 2);            // sign fixed
+                     dp -= (width_mmx*8 - 2);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1587,8 +1584,8 @@ loop2_pass4:
                         }
                      }
 
-                     sptr -= (width_mmx*2 - 2);	// sign fixed
-                     dp -= (width_mmx*4 - 2);	// sign fixed
+                     sptr -= (width_mmx*2 - 2);            // sign fixed
+                     dp -= (width_mmx*4 - 2);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1640,8 +1637,8 @@ loop4_pass0:
                         }
                      }
 
-                     sptr -= (width_mmx*4 - 4);	// sign fixed
-                     dp -= (width_mmx*32 - 4);	// sign fixed
+                     sptr -= (width_mmx*4 - 4);            // sign fixed
+                     dp -= (width_mmx*32 - 4);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1685,8 +1682,8 @@ loop4_pass2:
                         }
                      }
 
-                     sptr -= (width_mmx*4 - 4);	// sign fixed
-                     dp -= (width_mmx*16 - 4);	// sign fixed
+                     sptr -= (width_mmx*4 - 4);            // sign fixed
+                     dp -= (width_mmx*16 - 4);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1728,8 +1725,8 @@ loop4_pass4:
                         }
                      }
 
-                     sptr -= (width_mmx*4 - 4);	// sign fixed
-                     dp -= (width_mmx*8 - 4);	// sign fixed
+                     sptr -= (width_mmx*4 - 4);          // sign fixed
+                     dp -= (width_mmx*8 - 4);            // sign fixed
                      for (i = width; i; i--)
                      {
                         png_byte v[8];
@@ -1780,7 +1777,7 @@ loop4_pass4:
             } /* end of mmx_supported */
 
             else /* MMX not supported:  use modified C code - takes advantage
-                  * of inlining of memcpy for a constant */
+                  * of inlining of png_memcpy for a constant */
             {
                if (pixel_bytes == 1)
                {
@@ -1878,9 +1875,6 @@ loop4_pass4:
          (png_uint_32)row_info->pixel_depth + 7) >> 3);
    }
 
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   mmx_supported = save_mmx_supported;
-#endif
 }
 
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
@@ -1898,7 +1892,7 @@ union uAll {
 
 
 // Optimized code for PNG Average filter decoder
-void
+void /* PRIVATE */
 png_read_filter_row_mmx_avg(png_row_infop row_info, png_bytep row
                             , png_bytep prev_row)
 {
@@ -2112,8 +2106,8 @@ davg4lp:
       case 2:
       {
          ActiveMask.use  = 0x000000000000ffff;
-         ShiftBpp.use = 24;   // == 3 * 8
-         ShiftRem.use = 40;   // == 64 - 24
+         ShiftBpp.use = 16;   // == 2 * 8     [BUGFIX]
+         ShiftRem.use = 48;   // == 64 - 16   [BUGFIX]
          _asm {
             // Load ActiveMask
             movq mm7, ActiveMask
@@ -2128,7 +2122,7 @@ davg4lp:
                               // (we correct position in loop below)
 davg2lp:
             movq mm0, [edi + ebx]
-            psllq mm2, ShiftRem  // shift data to position correctly
+            psrlq mm2, ShiftRem  // shift data to position correctly   [BUGFIX]
             movq mm1, [esi + ebx]
             // Add (Prev_row/2) to Average
             movq mm3, mm5
@@ -2331,7 +2325,7 @@ davgend:
 }
 
 // Optimized code for PNG Paeth filter decoder
-void
+void /* PRIVATE */
 png_read_filter_row_mmx_paeth(png_row_infop row_info, png_bytep row,
                               png_bytep prev_row)
 {
@@ -3227,7 +3221,7 @@ dpthend:
 }
 
 // Optimized code for PNG Sub filter decoder
-void
+void /* PRIVATE */
 png_read_filter_row_mmx_sub(png_row_infop row_info, png_bytep row)
 {
    //int test;
@@ -3316,7 +3310,7 @@ dsub3lp:
       case 1:
       {
          // Placed here just in case this is a duplicate of the
-         // non-MMX code for the SUB filter in png_read_filter_row above
+         // non-MMX code for the SUB filter in png_read_filter_row below
          //
          //         png_bytep rp;
          //         png_bytep lp;
@@ -3531,7 +3525,7 @@ dsubend:
 }
 
 // Optimized code for PNG Up filter decoder
-void
+void /* PRIVATE */
 png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,
    png_bytep prev_row)
 {
@@ -3646,66 +3640,55 @@ dupend:
 
 
 // Optimized png_read_filter_row routines
-void
+void /* PRIVATE */
 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
    row, png_bytep prev_row, int filter)
 {
 #ifdef PNG_DEBUG
-   char filnm[6];
+   char filnm[10];
 #endif
-   #define UseMMX 1
 
-   if (mmx_supported == 2)
-       mmx_supported = mmxsupport();
-
-   if (!mmx_supported)
-   {
-       png_read_filter_row_c(png_ptr, row_info, row, prev_row, filter);
-       return ;
+   if (mmx_supported == 2) {
+       png_mmx_support();
    }
 
 #ifdef PNG_DEBUG
    png_debug(1, "in png_read_filter_row\n");
-#if (UseMMX == 1)
-   png_debug1(0,"%s, ", "MMX");
-#else
-   png_debug1(0,"%s, ", "x86");
-#endif
    switch (filter)
    {
-      case 0: sprintf(filnm, "None ");
+      case 0: sprintf(filnm, "none");
          break;
-      case 1: sprintf(filnm, "Sub  ");
+      case 1: sprintf(filnm, "sub-%s", "MMX");
          break;
-      case 2: sprintf(filnm, "Up   ");
+      case 2: sprintf(filnm, "up-%s", "MMX");
          break;
-      case 3: sprintf(filnm, "Avg  ");
+      case 3: sprintf(filnm, "avg-%s", "MMX");
          break;
-      case 4: sprintf(filnm, "Paeth");
+      case 4: sprintf(filnm, "Paeth-%s", "MMX");
          break;
-      default: sprintf(filnm, "Unknw");
+      default: sprintf(filnm, "unknw");
          break;
    }
    png_debug2(0,"row=%5d, %s, ", png_ptr->row_number, filnm);
    png_debug2(0, "pd=%2d, b=%d, ", (int)row_info->pixel_depth,
       (int)((row_info->pixel_depth + 7) >> 3));
    png_debug1(0,"len=%8d, ", row_info->rowbytes);
-#endif
+#endif /* PNG_DEBUG */
 
    switch (filter)
    {
       case PNG_FILTER_VALUE_NONE:
          break;
+
       case PNG_FILTER_VALUE_SUB:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-            (row_info->rowbytes >= 128) )
+         if (
+             (row_info->pixel_depth >= PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT) &&
+             (row_info->rowbytes >= PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT))
          {
             png_read_filter_row_mmx_sub(row_info, row);
          }
          else
-#endif
          {
             png_uint_32 i;
             png_uint_32 istop = row_info->rowbytes;
@@ -3718,41 +3701,43 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_UP:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if (
+             (row_info->pixel_depth >= PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT) &&
+             (row_info->rowbytes >= PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT))
          {
             png_read_filter_row_mmx_up(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
-            png_bytep rp;
-            png_bytep pp;
             png_uint_32 i;
-            for (i = 0, rp = row, pp = prev_row;
-               i < row_info->rowbytes; i++, rp++, pp++)
+            png_uint_32 istop = row_info->rowbytes;
+            png_bytep rp = row;
+            png_bytep pp = prev_row;
+
+            for (i = 0; i < istop; ++i)
             {
-                  *rp = (png_byte)(((int)(*rp) + (int)(*pp)) & 0xff);
+               *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+               rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_AVG:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if (
+             (row_info->pixel_depth >= PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT) &&
+             (row_info->rowbytes >= PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT))
          {
             png_read_filter_row_mmx_avg(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
             png_uint_32 i;
             png_bytep rp = row;
@@ -3774,19 +3759,19 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                   ((int)(*pp++ + *lp++) >> 1)) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_PAETH:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if (
+             (row_info->pixel_depth >= PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT) &&
+             (row_info->rowbytes >= PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT))
          {
             png_read_filter_row_mmx_paeth(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
             png_uint_32 i;
             png_bytep rp = row;
@@ -3837,12 +3822,15 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                *rp = (png_byte)(((int)(*rp) + p) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       default:
-         png_error(png_ptr, "Bad adaptive filter type");
+         png_warning(png_ptr, "Ignoring bad row filter type");
+         *row=0;
          break;
    }
 }
-#endif
+
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED && PNG_USE_PNGVCRD */

pngwio.c

@@ -1,11 +1,11 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This file provides a location for all output.  Users who need
  * special handling are expected to write functions that have the same
@@ -17,6 +17,7 @@
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Write the data to whatever output you are using.  The default routine
    writes to a file pointer.  Note that this routine sometimes gets called
@@ -24,7 +25,7 @@
    buffering if you are using unbuffered writes.  This should never be asked
    to write more than 64K on a 16 bit machine.  */
 
-void
+void /* PRIVATE */
 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    if (png_ptr->write_data_fn != NULL )
@@ -39,16 +40,19 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    write_data function and use it at run time with png_set_write_fn(), rather
    than changing the library. */
 #ifndef USE_FAR_KEYWORD
-static void
+static void /* PRIVATE */
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+#if defined(_WIN32_WCE)
+   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
+   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
-   }
 }
 #else
 /* this is the model-independent version. Since the standard I/O library
@@ -59,19 +63,24 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+static void /* PRIVATE */
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)near_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+         check = 0;
+#else
       check = fwrite(near_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -83,7 +92,12 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
          png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+#if defined(_WIN32_WCE)
+         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+            err = 0;
+#else
          err = fwrite(buf, 1, written, io_ptr);
+#endif
          if (err != written)
             break;
          else
@@ -94,9 +108,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
-   }
 }
 
 #endif
@@ -106,7 +118,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    to disk).  After png_flush is called, there should be no data pending
    writing in any buffers. */
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
-void
+void /* PRIVATE */
 png_flush(png_structp png_ptr)
 {
    if (png_ptr->output_flush_fn != NULL)
@@ -114,13 +126,15 @@ png_flush(png_structp png_ptr)
 }
 
 #if !defined(PNG_NO_STDIO)
-static void
+static void /* PRIVATE */
 png_default_flush(png_structp png_ptr)
 {
-   FILE *io_ptr;
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+   png_FILE_p io_ptr;
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
+#endif
 }
 #endif
 #endif
@@ -147,7 +161,7 @@ png_default_flush(png_structp png_ptr)
                    PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
                    time, output_flush_fn will be ignored, although it must be
                    supplied for compatibility. */
-void
+void PNGAPI
 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
@@ -211,3 +225,4 @@ void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
 }
 #   endif
 #   endif
+#endif /* PNG_WRITE_SUPPORTED */

pngwtran.c

@@ -1,24 +1,28 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.5d - November 29, 1999
+ * libpng 1.0.12beta1 - May 14, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Transform the data according to the user's wishes.  The order of
  * transformations is significant.
  */
-void
+void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_write_transformations\n");
 
+   if (png_ptr == NULL)
+      return;
+
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    if (png_ptr->transformations & PNG_USER_TRANSFORM)
       if(png_ptr->write_user_transform_fn != NULL)
@@ -79,7 +83,7 @@ png_do_write_transformations(png_structp png_ptr)
  * row_info bit depth should be 8 (one pixel per byte).  The channels
  * should be 1 (this only happens on grayscale and paletted images).
  */
-void
+void /* PRIVATE */
 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 {
    png_debug(1, "in png_do_pack\n");
@@ -137,7 +141,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
             {
                png_byte value;
 
-               value = (png_byte)(*sp & 0x3);
+               value = (png_byte)(*sp & 0x03);
                v |= (value << shift);
                if (shift == 0)
                {
@@ -169,7 +173,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
             {
                png_byte value;
 
-               value = (png_byte)(*sp & 0xf);
+               value = (png_byte)(*sp & 0x0f);
                v |= (value << shift);
 
                if (shift == 0)
@@ -205,7 +209,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
  * would pass 3 as bit_depth, and this routine would translate the
  * data to 0 to 15.
  */
-void
+void /* PRIVATE */
 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 {
    png_debug(1, "in png_do_shift\n");
@@ -329,7 +333,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 #endif
 
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_write_swap_alpha\n");
@@ -417,7 +421,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_write_invert_alpha\n");
@@ -495,3 +499,65 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
    }
 }
 #endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(s0-s1)&0xffff;
+            png_uint_32 blue=(s2-s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_WRITE_SUPPORTED */

projects/beos/x86-shared.txt

@@ -0,0 +1,22 @@
+This project builds a shared library version of libpng on x86 BeOS.
+
+It defines PNG_USE_PNGGCCRD, which activates the assembly code in
+pnggccrd.c; this hasn't been extensively tested on BeOS.
+
+To install:
+
+1) build
+
+   Note: As of version 1.0.10, you'll get a fair number of warnings when
+         you compile pnggccrd.c.  As far as I know, these are harmless,
+         but it would be better if someone fixed them.
+
+2) copy and png.h, pngconf.h somewhere; /boot/home/config/include (which
+   you'll have to make) is a good choice
+
+3) copy libpng.so to /boot/home/config/lib
+
+4) build your libpng.so applications (remember to include libz.a as
+   well when you link)
+
+- Chris Herborth, March 27, 2001

projects/beos/x86-static.txt

@@ -0,0 +1,22 @@
+This project builds a static library version of libpng on x86 BeOS.
+
+It defines PNG_USE_PNGGCCRD, which activates the assembly code in
+pnggccrd.c; this hasn't been extensively tested on BeOS.
+
+To install:
+
+1) build
+
+   Note: As of version 1.0.10, you'll get a fair number of warnings when
+         you compile pnggccrd.c.  As far as I know, these are harmless,
+         but it would be better if someone fixed them.
+
+2) copy and png.h, pngconf.h somewhere; /boot/home/config/include (which
+   you'll have to make) is a good choice
+
+3) copy libpng.a to /boot/home/config/lib
+
+4) build your libpng.a applications (remember to include libz.a as
+   well when you link)
+
+- Chris Herborth, March 27, 2001

projects/borland/libpng.bpf

@@ -0,0 +1,22 @@
+USEUNIT("libpng.cpp");
+USEUNIT("..\..\pngwutil.c");
+USEUNIT("..\..\pngerror.c");
+USEUNIT("..\..\pngget.c");
+USEUNIT("..\..\pngmem.c");
+USEUNIT("..\..\pngpread.c");
+USEUNIT("..\..\pngread.c");
+USEUNIT("..\..\pngrio.c");
+USEUNIT("..\..\pngrtran.c");
+USEUNIT("..\..\pngrutil.c");
+USEUNIT("..\..\pngset.c");
+USEUNIT("..\..\pngtrans.c");
+USEUNIT("..\..\pngwio.c");
+USEUNIT("..\..\pngwrite.c");
+USEUNIT("..\..\pngwtran.c");
+USEUNIT("..\..\png.c");
+USELIB("zlib.lib");
+//---------------------------------------------------------------------------
+This file is used by the project manager only and should be treated like the project file
+
+
+DllEntryPoint

projects/borland/libpng.bpg

@@ -0,0 +1,25 @@
+#------------------------------------------------------------------------------
+VERSION = BWS.01
+#------------------------------------------------------------------------------
+!ifndef ROOT
+ROOT = $(MAKEDIR)\..
+!endif
+#------------------------------------------------------------------------------
+MAKE = $(ROOT)\bin\make.exe -$(MAKEFLAGS) -f$**
+DCC = $(ROOT)\bin\dcc32.exe $**
+BRCC = $(ROOT)\bin\brcc32.exe $**
+#------------------------------------------------------------------------------
+PROJECTS = libpngstat.lib libpng.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+libpngstat.lib: libpngstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+libpng.dll: libpng.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/borland/libpng.bpr

@@ -0,0 +1,157 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="libpng.dll"/>
+    <OBJFILES value="libpng.obj ..\..\pngwutil.obj ..\..\pngerror.obj ..\..\pngget.obj 
+      ..\..\pngmem.obj ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj 
+      ..\..\pngrtran.obj ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj 
+      ..\..\pngwio.obj ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\png.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value="zlib.lib"/>
+    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
+    <SPARELIBS value="Vcl50.lib Vclx50.lib Tee50.lib NMFast50.lib dclocx50.lib bcbsmp50.lib"/>
+    <PACKAGES value="Vcl50.bpi Vclx50.bpi bcbsmp50.bpi Qrpt50.bpi Vcldb50.bpi Vclbde50.bpi 
+      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
+      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
+      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
+    <RELEASELIBPATH value="$(BCB)\lib\release"/>
+    <LINKER value="tlink32"/>
+    <USERDEFINES value="ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF"/>
+    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
+    <MAINSOURCE value="libpng.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wucp -wstv -wstu -wsig -wpin 
+      -wnod -wnak -wdef -wcln -wbbf -wasm -wamp -wamb"/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-WD -O2 -w -Vx -Ve -x- -RT- -X- -a8 -5 -b- -d -k- -vi -tWD -tWM -c"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <RFLAGS value=""/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value="-D&quot;&quot; -aa -Tpd -x -Gn -Gi -w"/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="c0d32.obj $(OBJFILES)"/>
+    <ALLRES value="$(RESFILES)"/>
+    <ALLLIB value="$(LIBFILES) $(LIBRARIES) import32.lib cw32mti.lib"/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=1
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=18
+Item0=..\..;..\..\..\zlib;$(BCB)\include
+Item1=..\..;P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item2=..\..;..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression\external;$(BCB)\include
+Item3=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression\external;$(BCB)\include
+Item4=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item5=..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item6=..\Source\ThirdParty\PortableNetworkGraphics;P:\Development\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item7=..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\include
+Item8=$(BCB)\include
+Item9=..\Source;..\Source\General\Templates;..\Source\SIMUtilities;$(BCB)\include;$(BCB)\include\vcl
+Item10=P:\Development\Source\;P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item11=P:\Development\Source;P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item12=P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item13=P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities;$(BCB)\include;$(BCB)\include\vcl
+Item14=P:\Development\Source\General\Templates\;$(BCB)\include;$(BCB)\include\vcl
+Item15=P:\Development\Source\General\Templates;$(BCB)\include;$(BCB)\include\vcl
+Item16=P:\Development\Source;$(BCB)\include;$(BCB)\include\vcl
+Item17=$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=10
+Item0=..\..;$(BCB)\lib\obj;$(BCB)\lib
+Item1=..\..;..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item2=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item3=..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item4=$(BCB)\lib\obj;$(BCB)\lib
+Item5=..\Source\SIMUtilities;..\Source;$(BCB)\lib\obj;$(BCB)\lib
+Item6=P:\Development\Source\SIMUtilities\;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item7=P:\Development\Source\SIMUtilities;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item8=P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item9=P:\Development\Source;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=20
+Item0=ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF
+Item1=_DEBUG;ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF
+Item2=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_NO_MODULEDEF
+Item3=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF;PNG_NO_GLOBAL_ARRAYS
+Item4=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF;PNG_SETJMP_NOT_SUPPORTED;PNG_DEBUG_FILE=stderr
+Item5=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG;PNG_NO_MODULEDEF;PNG_SETJMP_NOT_SUPPORTED
+Item6=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF;PNG_SETJMP_NOT_SUPPORTED
+Item7=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF
+Item8=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5
+Item9=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG
+Item10=PNG_BUILD_DLL;ZLIB_DLL
+Item11=PNG_BUILD_DLL
+Item12=PNG_DLL;PNG_BUILD_DLL;ZLIB_DLL
+Item13=PNG_DLL;PNG_BUILD_DLL;PNG_NO_GLOBAL_ARRAYS;ZLIB_DLL
+Item14=PNG_DLL;PNG_BUILD_DLL;PNG_NO_GLOBAL_ARRAYS
+Item15=PNG_DLL;PNG_BUILD_DLL
+Item16=PNG_DLL;PNG_BUILD_DLL;PNG_MODULEDEF
+Item17=_HTML_FORM
+Item18=_DEBUG;_HTML_FORM
+Item19=_DEBUG
+
+[HistoryLists\hlIntOutputDir]
+Count=2
+Item0=..\Obj
+Item1=P:\Development\Obj
+
+[Debugging]
+DebugSourceDirs=
+
+[Parameters]
+RunParams=
+HostApplication=P:\Development\Executables\LibPNGTestApp.exe
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+  </IDEOPTIONS>
+</PROJECT>

projects/borland/libpng.cpp

@@ -0,0 +1,29 @@
+//---------------------------------------------------------------------------
+#include <windows.h>
+//---------------------------------------------------------------------------
+//   Important note about DLL memory management when your DLL uses the
+//   static version of the RunTime Library:
+//
+//   If your DLL exports any functions that pass String objects (or structs/
+//   classes containing nested Strings) as parameter or function results,
+//   you will need to add the library MEMMGR.LIB to both the DLL project and
+//   any other projects that use the DLL.  You will also need to use MEMMGR.LIB
+//   if any other projects which use the DLL will be performing new or delete
+//   operations on any non-TObject-derived classes which are exported from the
+//   DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
+//   EXE's to use the BORLNDMM.DLL as their memory manager.  In these cases,
+//   the file BORLNDMM.DLL should be deployed along with your DLL.
+//
+//   To avoid using BORLNDMM.DLL, pass string information using "char *" or
+//   ShortString parameters.
+//
+//   If your DLL uses the dynamic version of the RTL, you do not need to
+//   explicitly add MEMMGR.LIB as this will be done implicitly for you
+//---------------------------------------------------------------------------
+
+int WINAPI DllEntryPoint(HINSTANCE, unsigned long, void*)
+{
+    return 1;
+}
+//---------------------------------------------------------------------------
+ 

projects/borland/libpng.readme.txt

@@ -0,0 +1,19 @@
+Project files to build libpng using Borland C++ Builder v5.0
+
+To use this dll, you will need to:
+
+1) add the following conditional defines to your project
+
+PNG_USE_DLL
+Z_PREFIX
+
+2) add the paths to png.h and zlib.h to your include path
+
+3) add libpng.lib or libpngstat.lib to the project.
+
+If you are using libpng.dll, libpng.dll and zlib.dll will be required for the code to run.
+
+Alternatively, the libpng.dll can be built using zlibstat.lib to produce one dll containing both the zlib and png code.
+
+See the libpng documentation for instructions on how to use the code.
+

projects/borland/libpngstat.bpf

@@ -0,0 +1,22 @@
+USELIB("zlibstat.lib");
+USEUNIT("..\..\pngerror.c");
+USEUNIT("..\..\png.c");
+USEUNIT("..\..\pngwutil.c");
+USEUNIT("..\..\pngmem.c");
+USEUNIT("..\..\pngpread.c");
+USEUNIT("..\..\pngread.c");
+USEUNIT("..\..\pngrio.c");
+USEUNIT("..\..\pngrtran.c");
+USEUNIT("..\..\pngrutil.c");
+USEUNIT("..\..\pngset.c");
+USEUNIT("..\..\pngtrans.c");
+USEUNIT("..\..\pngwio.c");
+USEUNIT("..\..\pngwrite.c");
+USEUNIT("..\..\pngwtran.c");
+USEUNIT("..\..\pngget.c");
+//---------------------------------------------------------------------------
+#define Library
+
+// To add a file to the library use the Project menu 'Add to Project'.
+
+ 

projects/borland/libpngstat.bpr

@@ -0,0 +1,109 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="libpngstat.lib"/>
+    <OBJFILES value="..\..\pngerror.obj ..\..\png.obj ..\..\pngwutil.obj ..\..\pngmem.obj 
+      ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj ..\..\pngrtran.obj 
+      ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj ..\..\pngwio.obj 
+      ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\pngget.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value="zlibstat.lib"/>
+    <LIBRARIES value=""/>
+    <PACKAGES value=""/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <LINKER value="TLib"/>
+    <USERDEFINES value=""/>
+    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
+    <MAINSOURCE value="libpngstat.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w-par"/>
+    <LISTFILE value=""/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-O2 -w -Vx -Ve -X- -a8 -5 -b- -d -k- -vi -c -tW -tWM"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value=""/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="$(OBJFILES)"/>
+    <ALLLIB value=""/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=0
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=1.0.0.0
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=2
+Item0=..\..;P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item1=..\..;$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=1
+Item0=..\..;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=1
+Item0=_DEBUG
+
+[HistoryLists\hlTlibPageSize]
+Count=1
+Item0=0x0010
+
+[Debugging]
+DebugSourceDirs=$(BCB)\source\vcl
+
+[Parameters]
+RunParams=
+HostApplication=
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+
+[Language]
+ActiveLang=
+ProjectLang=
+RootDir=
+  </IDEOPTIONS>
+</PROJECT>

projects/borland/zlib+libpng.bpg

@@ -0,0 +1,33 @@
+#------------------------------------------------------------------------------
+VERSION = BWS.01
+#------------------------------------------------------------------------------
+!ifndef ROOT
+ROOT = $(MAKEDIR)\..
+!endif
+#------------------------------------------------------------------------------
+MAKE = $(ROOT)\bin\make.exe -$(MAKEFLAGS) -f$**
+DCC = $(ROOT)\bin\dcc32.exe $**
+BRCC = $(ROOT)\bin\brcc32.exe $**
+#------------------------------------------------------------------------------
+PROJECTS = zlibstat.lib libpngstat.lib zlib.dll libpng.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+libpng.dll: libpng.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlibstat.lib: zlibstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlib.dll: zlib.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+libpngstat.lib: libpngstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/borland/zlib.bpf

@@ -0,0 +1,20 @@
+USEUNIT("zlib.cpp");
+USEUNIT("..\..\..\zlib\zutil.c");
+USEUNIT("..\..\..\zlib\compress.c");
+USEUNIT("..\..\..\zlib\crc32.c");
+USEUNIT("..\..\..\zlib\deflate.c");
+USEUNIT("..\..\..\zlib\gzio.c");
+USEUNIT("..\..\..\zlib\infblock.c");
+USEUNIT("..\..\..\zlib\infcodes.c");
+USEUNIT("..\..\..\zlib\inffast.c");
+USEUNIT("..\..\..\zlib\inflate.c");
+USEUNIT("..\..\..\zlib\inftrees.c");
+USEUNIT("..\..\..\zlib\infutil.c");
+USEUNIT("..\..\..\zlib\trees.c");
+USEUNIT("..\..\..\zlib\uncompr.c");
+USEUNIT("..\..\..\zlib\adler32.c");
+//---------------------------------------------------------------------------
+This file is used by the project manager only and should be treated like the project file
+
+
+DllEntryPoint

projects/borland/zlib.bpg

@@ -0,0 +1,25 @@
+#------------------------------------------------------------------------------
+VERSION = BWS.01
+#------------------------------------------------------------------------------
+!ifndef ROOT
+ROOT = $(MAKEDIR)\..
+!endif
+#------------------------------------------------------------------------------
+MAKE = $(ROOT)\bin\make.exe -$(MAKEFLAGS) -f$**
+DCC = $(ROOT)\bin\dcc32.exe $**
+BRCC = $(ROOT)\bin\brcc32.exe $**
+#------------------------------------------------------------------------------
+PROJECTS = zlibstat.lib zlib.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+zlibstat.lib: zlibstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlib.dll: zlib.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/borland/zlib.bpr

@@ -0,0 +1,147 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="zlib.dll"/>
+    <OBJFILES value="zlib.obj ..\..\..\zlib\zutil.obj ..\..\..\zlib\compress.obj 
+      ..\..\..\zlib\crc32.obj ..\..\..\zlib\deflate.obj ..\..\..\zlib\gzio.obj 
+      ..\..\..\zlib\infblock.obj ..\..\..\zlib\infcodes.obj 
+      ..\..\..\zlib\inffast.obj ..\..\..\zlib\inflate.obj 
+      ..\..\..\zlib\inftrees.obj ..\..\..\zlib\infutil.obj 
+      ..\..\..\zlib\trees.obj ..\..\..\zlib\uncompr.obj ..\..\..\zlib\adler32.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value=""/>
+    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
+    <SPARELIBS value="Vcl50.lib Vclx50.lib Tee50.lib NMFast50.lib dclocx50.lib bcbsmp50.lib"/>
+    <PACKAGES value="Vcl50.bpi Vclx50.bpi bcbsmp50.bpi Qrpt50.bpi Vcldb50.bpi Vclbde50.bpi 
+      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
+      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
+      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
+    <PATHCPP value=".;..\..\..\zlib"/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
+    <RELEASELIBPATH value="$(BCB)\lib\release"/>
+    <LINKER value="tlink32"/>
+    <USERDEFINES value="ZLIB_DLL;Z_PREFIX"/>
+    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
+    <MAINSOURCE value="zlib.bpf"/>
+    <INCLUDEPATH value="..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wuse -wucp -wstv -wstu -wpin 
+      -w-par -wnod -wnak -wdef -wcln -wbbf -w-aus -wasm -wamp -wamb"/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-WD -O2 -w -Vx -Ve -x- -RT- -ff -X- -a8 -5 -b- -d -k- -vi -tWD -tWM -c"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <RFLAGS value=""/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value="-D&quot;&quot; -aa -Tpd -x -Gn -Gi -w"/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="c0d32.obj $(OBJFILES)"/>
+    <ALLRES value="$(RESFILES)"/>
+    <ALLLIB value="$(LIBFILES) $(LIBRARIES) import32.lib cw32mti.lib"/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=1
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=1.0.0.0
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=16
+Item0=..\..\..\zlib;$(BCB)\include
+Item1=..\..\..;..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;..\..\..\zlib;$(BCB)\include
+Item2=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;..\..\..\zlib;$(BCB)\include
+Item3=P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item4=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item5=..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item6=$(BCB)\include
+Item7=..\Source;..\Source\General\Templates;..\Source\SIMUtilities;$(BCB)\include;$(BCB)\include\vcl
+Item8=P:\Development\Source\;P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item9=P:\Development\Source;P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item10=P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities\;$(BCB)\include;$(BCB)\include\vcl
+Item11=P:\Development\Source\General\Templates\;P:\Development\Source\SIMUtilities;$(BCB)\include;$(BCB)\include\vcl
+Item12=P:\Development\Source\General\Templates\;$(BCB)\include;$(BCB)\include\vcl
+Item13=P:\Development\Source\General\Templates;$(BCB)\include;$(BCB)\include\vcl
+Item14=P:\Development\Source;$(BCB)\include;$(BCB)\include\vcl
+Item15=$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=12
+Item0=..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item1=..\..\..;..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item2=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item3=P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item4=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression;$(BCB)\lib\obj;$(BCB)\lib
+Item5=$(BCB)\lib\obj;$(BCB)\lib
+Item6=..\Source\ThirdParty\ZLibCompression;$(BCB)\lib\obj;$(BCB)\lib
+Item7=..\Source\SIMUtilities;..\Source;$(BCB)\lib\obj;$(BCB)\lib
+Item8=P:\Development\Source\SIMUtilities\;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item9=P:\Development\Source\SIMUtilities;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item10=P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item11=P:\Development\Source;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=8
+Item0=ZLIB_DLL;Z_PREFIX
+Item1=ZLIB_DLL;_DEBUG;Z_PREFIX
+Item2=ZLIB_DLL;_DEBUG
+Item3=ZLIB_DLL
+Item4=_WINDOWS;ZLIB_DLL
+Item5=_HTML_FORM
+Item6=_DEBUG;_HTML_FORM
+Item7=_DEBUG
+
+[HistoryLists\hlIntOutputDir]
+Count=2
+Item0=..\Obj
+Item1=P:\Development\Obj
+
+[Debugging]
+DebugSourceDirs=
+
+[Parameters]
+RunParams=
+HostApplication=
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+  </IDEOPTIONS>
+</PROJECT>

projects/borland/zlib.cpp

@@ -0,0 +1,30 @@
+//---------------------------------------------------------------------------
+
+#include <windows.h>
+//---------------------------------------------------------------------------
+//   Important note about DLL memory management when your DLL uses the
+//   static version of the RunTime Library:
+//
+//   If your DLL exports any functions that pass String objects (or structs/
+//   classes containing nested Strings) as parameter or function results,
+//   you will need to add the library MEMMGR.LIB to both the DLL project and
+//   any other projects that use the DLL.  You will also need to use MEMMGR.LIB
+//   if any other projects which use the DLL will be performing new or delete
+//   operations on any non-TObject-derived classes which are exported from the
+//   DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
+//   EXE's to use the BORLNDMM.DLL as their memory manager.  In these cases,
+//   the file BORLNDMM.DLL should be deployed along with your DLL.
+//
+//   To avoid using BORLNDMM.DLL, pass string information using "char *" or
+//   ShortString parameters.
+//
+//   If your DLL uses the dynamic version of the RTL, you do not need to
+//   explicitly add MEMMGR.LIB as this will be done implicitly for you
+//---------------------------------------------------------------------------
+
+int WINAPI DllEntryPoint(HINSTANCE, unsigned long, void*)
+{
+    return 1;
+}
+//---------------------------------------------------------------------------
+ 

projects/borland/zlibstat.bpf

@@ -0,0 +1,20 @@
+USEUNIT("..\..\..\zlib\zutil.c");
+USEUNIT("..\..\..\zlib\compress.c");
+USEUNIT("..\..\..\zlib\crc32.c");
+USEUNIT("..\..\..\zlib\deflate.c");
+USEUNIT("..\..\..\zlib\gzio.c");
+USEUNIT("..\..\..\zlib\infblock.c");
+USEUNIT("..\..\..\zlib\infcodes.c");
+USEUNIT("..\..\..\zlib\inffast.c");
+USEUNIT("..\..\..\zlib\inflate.c");
+USEUNIT("..\..\..\zlib\inftrees.c");
+USEUNIT("..\..\..\zlib\infutil.c");
+USEUNIT("..\..\..\zlib\trees.c");
+USEUNIT("..\..\..\zlib\uncompr.c");
+USEUNIT("..\..\..\zlib\adler32.c");
+//---------------------------------------------------------------------------
+#define Library
+
+// To add a file to the library use the Project menu 'Add to Project'.
+
+ 

projects/borland/zlibstat.bpr

@@ -0,0 +1,131 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="zlibstat.lib"/>
+    <OBJFILES value="..\..\..\zlib\zutil.obj ..\..\..\zlib\compress.obj ..\..\..\zlib\crc32.obj 
+      ..\..\..\zlib\deflate.obj ..\..\..\zlib\gzio.obj 
+      ..\..\..\zlib\infblock.obj ..\..\..\zlib\infcodes.obj 
+      ..\..\..\zlib\inffast.obj ..\..\..\zlib\inflate.obj 
+      ..\..\..\zlib\inftrees.obj ..\..\..\zlib\infutil.obj 
+      ..\..\..\zlib\trees.obj ..\..\..\zlib\uncompr.obj ..\..\..\zlib\adler32.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value=""/>
+    <LIBRARIES value=""/>
+    <PACKAGES value=""/>
+    <PATHCPP value=".;..\..\..\zlib"/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <LINKER value="TLib"/>
+    <USERDEFINES value="Z_PREFIX"/>
+    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
+    <MAINSOURCE value="zlibstat.bpf"/>
+    <INCLUDEPATH value="..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wuse -wucp -wstv -wstu -wpin 
+      -wnod -wnak -wdef -wcln -wbbf -w-aus -wasm -wamp -wamb"/>
+    <LISTFILE value=""/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-O2 -w -Vx -Ve -x- -RT- -X- -a8 -5 -b- -d -k- -vi -c -tW -tWM"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value=""/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="$(OBJFILES)"/>
+    <ALLLIB value=""/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=0
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=1.0.0.0
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=8
+Item0=..\..\..\zlib;$(BCB)\include
+Item1=..\Source\ThirdParty\ZLibCompression\external;..\..\..\zlib;$(BCB)\include
+Item2=P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item3=..\Source\ThirdParty\ZLibCompression\external;$(BCB)\include
+Item4=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression\ext;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item5=..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item6=$(BCB)\include
+Item7=$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=7
+Item0=..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item1=$(BCB)\lib\obj;$(BCB)\lib
+Item2=..\Source\ThirdParty\ZLibCompression\external;..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item3=P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\lib\obj;$(BCB)\lib
+Item4=..\Source\ThirdParty\ZLibCompression\external;$(BCB)\lib\obj;$(BCB)\lib
+Item5=..\Source\ThirdParty\ZLibCompression\external;..\Source\ThirdParty\ZLibCompression\ext;..\Source\ThirdParty\ZLibCompression;$(BCB)\lib\obj;$(BCB)\lib
+Item6=..\Source\ThirdParty\ZLibCompression;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=3
+Item0=Z_PREFIX
+Item1=ZLIB_DLL
+Item2=_WINDOWS;ZLIB_DLL
+
+[HistoryLists\hlIntOutputDir]
+Count=2
+Item0=..\Obj
+Item1=P:\Development\Obj
+
+[HistoryLists\hlTlibPageSize]
+Count=1
+Item0=0x0010
+
+[Debugging]
+DebugSourceDirs=
+
+[Parameters]
+RunParams=
+HostApplication=
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+
+[Language]
+ActiveLang=
+ProjectLang=
+RootDir=
+  </IDEOPTIONS>
+</PROJECT>

projects/msvc/README.txt

@@ -0,0 +1,47 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for
+libpng 1.0.12beta1 (May 14, 2001) and zlib
+
+Copyright (C) 2000 Simon-Pierre Cadieux
+For conditions of distribution and use, see copyright notice in png.h
+
+Assumes that libpng sources are in ..\..
+Assumes that zlib sources have been copied to ..\..\..\zlib
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration". 
+   Among the configurations beginning with "libpng" select the 
+   one you wish to build (the corresponding "zlib" configuration
+   will be built automatically).
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) Look in the appropriate "win32" subdirectories for both "zlib"
+   and "libpng" binaries.
+
+This project will build the PNG Development Group's "official" versions of
+libpng and zlib libraries:
+
+   libpng2.dll          (default version, currently C code only)
+   libpng2.dll         (C + Assembler version)
+   libpng2.dll         (C + Assembler debug version)
+   libpng2.dll         (C code debug version)
+   libpng2[c,e-m].dll   (reserved for official versions) 
+   libpng2[n-z].dll     (available for private versions)
+   zlib.dll             (default version, currently C code only)
+   zlibd.dll            (debug version)
+
+If you change anything in libpng, or select different compiler settings,
+please change the library name to an unreserved name, and define
+DLLFNAME_POSTFIX and (PRIVATEBUILD or SPECIALBUILD) accordingly. DLLFNAME_POSTFIX
+should correspond to a string in the range of "N" to "Z" depending on the letter 
+you choose for your private version.
+
+All DLLs built by this project use the Microsoft dynamic C runtime library
+MSVCRT.DLL (MSVCRTD.DLL for debug versions). If you distribute any of the
+above mentioned libraries you should also include this DLL in your package.
+For a list of files that are redistributable in Visual C++ 6.0, see
+Common\Redist\Redist.txt on Disc 1 of the Visual C++ 6.0 product CDs. 
+

projects/msvc/libpng.dsp

@@ -0,0 +1,367 @@
+# Microsoft Developer Studio Project File - Name="libpng" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+# TARGTYPE "Win32 (x86) Static Library" 0x0104
+
+CFG=libpng - Win32 DLL
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "libpng.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "libpng.mak" CFG="libpng - Win32 DLL"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "libpng - Win32 DLL" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL Debug ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 LIB" (based on "Win32 (x86) Static Library")
+!MESSAGE "libpng - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\dll"
+# PROP Intermediate_Dir ".\win32\libpng\dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll\libpng2.dll"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\libpng\dll_dbg"
+# PROP Intermediate_Dir ".\win32\libpng\dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MDd /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\.." /I "..\..\..\zlib" /D "DEBUG" /D "_DEBUG" /D PNG_DEBUG=1 /D "WIN32" /D "_WINDOWS" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /GZ /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbg\libpng2d.dll"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\dll_asm"
+# PROP Intermediate_Dir ".\win32\libpng\dll_asm"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "PNG_USE_PNGVCRD" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG" /d "PNG_USE_PNGVCRD"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll_asm\libpng2a.dll"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\libpng\dll_dbga"
+# PROP Intermediate_Dir ".\win32\libpng\dll_dbga"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MDd /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\.." /I "..\..\..\zlib" /D "DEBUG" /D "_DEBUG" /D PNG_DEBUG=1 /D "WIN32" /D "_WINDOWS" /D "PNG_USE_PNGVCRD" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /GZ /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1  /d "PNG_USE_PNGVCRD"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbga\libpng2b.dll"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\lib"
+# PROP Intermediate_Dir ".\win32\libpng\lib"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /O1 /D "WIN32" /D "NDEBUG" /D "_LIB" /FD /c
+# ADD CPP /nologo /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /Yu"png.h" /FD /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\libpng\lib_dbg"
+# PROP Intermediate_Dir ".\win32\libpng\lib_dbg"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_LIB" /FD /GZ /c
+# ADD CPP /nologo /W3 /Zi /Od /I "..\.." /I "..\..\..\zlib" /D "DEBUG" /D "_DEBUG" /D PNG_DEBUG=1 /D "WIN32" /Yu"png.h" /FD /GZ /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ENDIF 
+
+# Begin Target
+
+# Name "libpng - Win32 DLL"
+# Name "libpng - Win32 DLL Debug"
+# Name "libpng - Win32 DLL ASM"
+# Name "libpng - Win32 DLL Debug ASM"
+# Name "libpng - Win32 LIB"
+# Name "libpng - Win32 LIB Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\png.c
+# SUBTRACT CPP /YX /Yc /Yu
+# End Source File
+# Begin Source File
+
+SOURCE=.\png.rc
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=.\png32ms.def
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngerror.c
+# ADD CPP /Yc"png.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngget.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngmem.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngpread.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngread.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrio.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrtran.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrutil.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngset.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngtrans.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngvcrd.c
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwio.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwrite.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwtran.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwutil.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=..\..\png.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngconf.h
+# End Source File
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# End Group
+# Begin Source File
+
+SOURCE=.\readme.txt
+# PROP Exclude_From_Build 1
+# End Source File
+# End Target
+# End Project

projects/msvc/libpng.dsw

@@ -0,0 +1,44 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "libpng"=.\libpng.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name zlib
+    End Project Dependency
+}}}
+
+###############################################################################
+
+Project: "zlib"=.\zlib.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

projects/msvc/png.rc

@@ -0,0 +1,100 @@
+#define PNG_VERSION_INFO_ONLY
+
+#include <windows.h>
+#include "png.h"
+
+#define _QUOTE(x) # x
+#define QUOTE(x) _QUOTE(x)
+
+#define PNG_LIBPNG_DLLFNAME "LIBPNG"
+
+#if defined(DLLFNAME_POSTFIX) && !defined(PRIVATEBUILD) && !defined(SPECIALBUILD)
+#  error PRIVATEBUILD or SPECIALBUILD must be defined as a string describing the type of change brought to the standard library
+#endif /* defined(DLLFNAME_POSTFIX)... */
+
+#if !defined(DLLFNAME_POSTFIX) && defined(PNG_USE_PNGVCRD)
+#  if defined(PNG_DEBUG) && (PNG_DEBUG > 0)
+#    define DLLFNAME_POSTFIX "B"
+#  else
+#    define DLLFNAME_POSTFIX "A"
+#  endif /* !defined(DLLFNAME_POSTFIX)... */
+#  if !defined(SPECIALBUILD)
+#    define SPECIALBUILD "Use MMX instructions"
+#  endif /* SPECIALBUILD */
+#endif
+
+#if defined(PNG_DEBUG) && (PNG_DEBUG > 0)
+#  define VS_DEBUG VS_FF_DEBUG
+#  ifndef DLLFNAME_POSTFIX
+#    define DLLFNAME_POSTFIX "D"
+#  endif /* DLLFNAME_POSTFIX */
+#  ifndef COMMENTS 
+#    define COMMENTS "PNG_DEBUG=" QUOTE(PNG_DEBUG)
+#  endif /* COMMENTS */
+#else
+#  define VS_DEBUG 0
+#  ifndef DLLFNAME_POSTFIX
+#     define DLLFNAME_POSTFIX
+#  endif /* DLLFNAME_POSTFIX */
+#endif /* defined(DEBUG)... */
+
+#ifdef PRIVATEBUILD
+#  define VS_PRIVATEBUILD VS_FF_PRIVATEBUILD
+#else
+#  define VS_PRIVATEBUILD 0
+#endif /* PRIVATEBUILD */
+
+#ifdef SPECIALBUILD
+#  define VS_SPECIALBUILD VS_FF_SPECIALBUILD
+#else
+#  define VS_SPECIALBUILD 0
+#endif /* SPECIALBUILD */
+
+#if ((PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_TYPEMASK) != \
+      PNG_LIBPNG_BUILD_STABLE)
+#  define VS_PRERELEASE VS_FF_PRERELEASE
+#  define VS_PATCHED 0
+#else
+#  define VS_PRERELEASE 0
+#  if (PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_PATCHED)
+#    define VS_PATCHED VS_FF_PATCHED
+#  else
+#    define VS_PATCHED 0
+#  endif
+#endif
+
+VS_VERSION_INFO VERSIONINFO 
+FILEVERSION PNG_LIBPNG_VER_MAJOR, PNG_LIBPNG_VER_MINOR, PNG_LIBPNG_VER_RELEASE, PNG_LIBPNG_VER_BUILD
+PRODUCTVERSION PNG_LIBPNG_VER_MAJOR, PNG_LIBPNG_VER_MINOR, PNG_LIBPNG_VER_RELEASE, PNG_LIBPNG_VER_BUILD
+FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
+FILEFLAGS VS_DEBUG | VS_PRIVATEBUILD | VS_SPECIALBUILD | VS_PRERELEASE | VS_PATCHED
+FILEOS VOS__WINDOWS32
+FILETYPE VFT_DLL
+FILESUBTYPE VFT2_UNKNOWN
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN BLOCK "040904E4" /* Language type = U.S English(0x0409) and Character Set = Windows, Multilingual(0x04E4) */
+    BEGIN
+#ifdef COMMENTS
+      VALUE "Comments", COMMENTS "\000"
+#endif /* COMMENTS */
+      VALUE "FileDescription", "PNG image compression library\000"
+      VALUE "FileVersion", PNG_LIBPNG_VER_STRING "\000"
+      VALUE "InternalName", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX " (Windows 32 bit)\000"
+      VALUE "LegalCopyright", "\251 1998-2000 Glenn Randers-Pehrson\000"
+      VALUE "OriginalFilename", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX ".DLL\000"
+#ifdef PRIVATEBUILD
+      VALUE "PrivateBuild", PRIVATEBUILD
+#endif /* PRIVATEBUILD */
+      VALUE "ProductName", "LibPNG\000"
+      VALUE "ProductVersion", "1\000"
+#ifdef SPECIALBUILD
+      VALUE "SpecialBuild", SPECIALBUILD
+#endif /* SPECIALBUILD */
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 0x04E4
+  END
+END

projects/msvc/png32ms.def

@@ -0,0 +1,213 @@
+;------------------------------------------
+; LIBPNG module definition file for Windows
+;------------------------------------------
+
+LIBRARY
+DESCRIPTION "PNG image compression library for Windows"
+
+EXPORTS
+;Version 1.0.12beta1
+  png_build_grayscale_palette  @1
+  png_check_sig        @2
+  png_chunk_error      @3
+  png_chunk_warning      @4
+  png_convert_from_struct_tm   @5
+  png_convert_from_time_t    @6
+  png_create_info_struct     @7
+  png_create_read_struct     @8
+  png_create_write_struct    @9
+  png_data_freer    @10
+  png_destroy_info_struct  @11
+  png_destroy_read_struct  @12
+  png_destroy_write_struct  @13
+  png_error    @14
+  png_free      @15
+  png_free_data    @16
+  png_get_IHDR    @17
+  png_get_PLTE    @18
+  png_get_bKGD    @19
+  png_get_bit_depth    @20
+  png_get_cHRM    @21
+  png_get_cHRM_fixed  @22
+  png_get_channels    @23
+  png_get_color_type  @24
+  png_get_compression_buffer_size  @25
+  png_get_compression_type  @26
+  png_get_copyright    @27
+  png_get_error_ptr    @28
+  png_get_filter_type  @29
+  png_get_gAMA    @30
+  png_get_gAMA_fixed  @31
+  png_get_hIST    @32
+  png_get_header_ver  @33
+  png_get_header_version  @34
+  png_get_iCCP    @35
+  png_get_image_height  @36
+  png_get_image_width  @37
+  png_get_interlace_type  @38
+  png_get_io_ptr    @39
+  png_get_libpng_ver  @40
+  png_get_oFFs    @41
+  png_get_pCAL    @42
+  png_get_pHYs    @43
+  png_get_pixel_aspect_ratio  @44
+  png_get_pixels_per_meter  @45
+  png_get_progressive_ptr  @46
+  png_get_rgb_to_gray_status  @47
+  png_get_rowbytes    @48
+  png_get_rows    @49
+  png_get_sBIT    @50
+  png_get_sCAL    @51
+  png_get_sPLT    @52
+  png_get_sRGB    @53
+  png_get_signature    @54
+  png_get_tIME    @55
+  png_get_tRNS    @56
+  png_get_text    @57
+  png_get_unknown_chunks  @58
+  png_get_user_chunk_ptr  @59
+  png_get_user_transform_ptr  @60
+  png_get_valid    @61
+  png_get_x_offset_microns  @62
+  png_get_x_offset_pixels  @63
+  png_get_x_pixels_per_meter  @64
+  png_get_y_offset_microns  @65
+  png_get_y_offset_pixels  @66
+  png_get_y_pixels_per_meter  @67
+  png_malloc    @68
+  png_memcpy_check    @69
+  png_memset_check    @70
+; png_permit_empty_plte is deprecated
+  png_permit_empty_plte  @71
+  png_process_data    @72
+  png_progressive_combine_row  @73
+  png_read_end    @74
+  png_read_image    @75
+  png_read_info    @76
+; png_read_init is deprecated
+  png_read_init    @77
+  png_read_png    @78
+  png_read_row    @79
+  png_read_rows    @80
+  png_read_update_info  @81
+  png_reset_zstream    @82
+  png_set_IHDR    @83
+  png_set_PLTE    @84
+  png_set_bKGD    @85
+  png_set_background  @86
+  png_set_bgr    @87
+  png_set_cHRM    @88
+  png_set_cHRM_fixed  @89
+  png_set_compression_buffer_size  @90
+  png_set_compression_level  @91
+  png_set_compression_mem_level  @92
+  png_set_compression_method  @93
+  png_set_compression_strategy  @94
+  png_set_compression_window_bits  @95
+  png_set_crc_action  @96
+  png_set_dither    @97
+  png_set_error_fn    @98
+  png_set_expand    @99
+  png_set_filler    @100
+  png_set_filter    @101
+  png_set_filter_heuristics  @102
+  png_set_flush    @103
+  png_set_gAMA    @104
+  png_set_gAMA_fixed  @105
+  png_set_gamma    @106
+  png_set_gray_1_2_4_to_8  @107
+  png_set_gray_to_rgb  @108
+  png_set_hIST    @109
+  png_set_iCCP    @110
+  png_set_interlace_handling  @111
+  png_set_invert_alpha  @112
+  png_set_invert_mono  @113
+  png_set_keep_unknown_chunks  @114
+  png_set_oFFs    @115
+  png_set_pCAL    @116
+  png_set_pHYs    @117
+  png_set_packing    @118
+  png_set_packswap    @119
+  png_set_palette_to_rgb  @120
+  png_set_progressive_read_fn  @121
+  png_set_read_fn    @122
+  png_set_read_status_fn  @123
+  png_set_read_user_chunk_fn  @124
+  png_set_read_user_transform_fn  @125
+  png_set_rgb_to_gray  @126
+  png_set_rgb_to_gray_fixed  @127
+  png_set_rows    @128
+  png_set_sBIT    @129
+  png_set_sCAL    @130
+  png_set_sPLT    @131
+  png_set_sRGB    @132
+  png_set_sRGB_gAMA_and_cHRM  @133
+  png_set_shift    @134
+  png_set_sig_bytes    @135
+  png_set_strip_16    @136
+  png_set_strip_alpha  @137
+  png_set_swap    @138
+  png_set_swap_alpha  @139
+  png_set_tIME    @140
+  png_set_tRNS    @141
+  png_set_tRNS_to_alpha  @142
+  png_set_text    @143
+  png_set_unknown_chunk_location  @144
+  png_set_unknown_chunks  @145
+  png_set_user_transform_info  @146
+  png_set_write_fn    @147
+  png_set_write_status_fn  @148
+  png_set_write_user_transform_fn  @149
+  png_sig_cmp    @150
+  png_start_read_image  @151
+  png_warning    @152
+  png_write_chunk    @153
+  png_write_chunk_data  @154
+  png_write_chunk_end  @155
+  png_write_chunk_start  @156
+  png_write_end    @157
+  png_write_flush    @158
+  png_write_image    @159
+  png_write_info    @160
+  png_write_info_before_PLTE  @161
+; png_write_init is deprecated
+  png_write_init    @162
+  png_write_png    @163
+  png_write_row    @164
+  png_write_rows    @165
+; png_read_init_2 and png_write_init_2 are deprecated.
+  png_read_init_2    @166
+  png_write_init_2    @167
+  png_access_version_number  @168
+;  png_sig_bytes    @169
+;  png_libpng_ver    @170
+  png_init_io    @171
+  png_convert_to_rfc1123     @172
+  png_set_invalid  @173
+; Added at version 1.0.12
+; For compatiblity with 1.0.7-1.0.11
+  png_info_init @174
+  png_read_init_3    @175
+  png_write_init_3    @176
+  png_info_init_3 @177
+  png_destroy_struct  @178
+; To be added at version 1.2.0
+; For use with PNG_USER_MEM_SUPPORTED
+; png_destroy_struct_2  @179
+; png_create_read_struct_2 @180
+; png_create_write_struct_2 @181
+; png_malloc_default @182
+; png_free_default @183
+; MNG features
+; png_permit_mng_features  @184
+; MMX support
+; png_mmx_support  @185
+; png_get_mmx_flagmask  @186
+; png_get_asm_flagmask  @187
+; png_get_asm_flags  @188
+; png_get_mmx_bitdepth_threshold  @189
+; png_get_mmx_rowbytes_threshold  @190
+; png_set_asm_flags  @191
+; png_init_mmx_flags  @192
+; Strip error numbers
+; png_set_strip_error_numbers @193

projects/msvc/zlib.def

@@ -0,0 +1,45 @@
+LIBRARY
+DESCRIPTION "zlib compression library for Windows"
+
+EXPORTS
+    adler32                        @1
+    compress                       @2
+    crc32                          @3
+    deflate                        @4
+    deflateCopy                    @5
+    deflateEnd                     @6
+    deflateInit2_                  @7
+    deflateInit_                   @8
+    deflateParams                  @9
+    deflateReset                   @10
+    deflateSetDictionary           @11
+    gzclose                        @12
+    gzdopen                        @13
+    gzerror                        @14
+    gzflush                        @15
+    gzopen                         @16
+    gzread                         @17
+    gzwrite                        @18
+    inflate                        @19
+    inflateEnd                     @20
+    inflateInit2_                  @21
+    inflateInit_                   @22
+    inflateReset                   @23
+    inflateSetDictionary           @24
+    inflateSync                    @25
+    uncompress                     @26
+    zlibVersion                    @27
+    gzprintf                       @28
+    gzputc                         @29
+    gzgetc                         @30
+    gzseek                         @31
+    gzrewind                       @32
+    gztell                         @33
+    gzeof                          @34
+    gzsetparams                    @35
+    zError                         @36
+    inflateSyncPoint               @37
+    get_crc_table                  @38
+    compress2                      @39
+    gzputs                         @40
+    gzgets                         @41