[libpng15] Imported from libpng-1.5.7rc03.tar

Merge branch 'libpng15' of ssh://www.simplesystems.org/git/libpng into libpng15
Conflicts: ANNOUNCE CHANGES
2025-07-10 18:04:09 +02:00 · 2011-12-08 08:44:15 -06:00 · 2011-12-04 19:31:52 -06:00 · 2011-12-04 19:29:29 -06:00 · 2011-12-03 20:16:12 -06:00 · 2011-12-02 20:14:21 -06:00
185 changed files with 41070 additions and 16633 deletions
--- a/248
+++ b/248
@@ -1,5 +1,5 @@

-Libpng 1.5.0beta18 - April 18, 2010
+Libpng 1.5.7rc03 - December 8, 2011

 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.
@@ -9,167 +9,123 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script

-   1.5.0beta18.tar.xz (LZMA-compressed, recommended)
-   1.5.0beta18.tar.gz
-   1.5.0beta18.tar.bz2
+   1.5.7rc03.tar.xz (LZMA-compressed, recommended)
+   1.5.7rc03.tar.gz
+   1.5.7rc03.tar.bz2

 Source files with CRLF line endings (for Windows), without the
 "configure" script

-   lp150b18.zip
-   lp150b18.7z
+   lp157r03.7z  (LZMA-compressed, recommended)
+   lp157r03.zip

 Other information:

-   1.5.0beta18-README.txt
-   1.5.0beta18-LICENSE.txt
+   1.5.7rc03-README.txt
+   1.5.7rc03-LICENSE.txt

-Changes since the last public release (1.4.1):
+Changes since the last public release (1.5.6):

-version 1.5.0beta01 [February 7, 2010]
-  Moved declaration of png_struct into private pngstruct.h and png_info
-    into pnginfo.h
+Version 1.5.7beta01 [November 4, 2011]
+  Added support for ARM processor (Mans Rullgard)
+  Fixed bug in pngvalid on early allocation failure; fixed type cast in
+    pngmem.c; pngvalid would attempt to call png_error() if the allocation
+    of a png_struct or png_info failed. This would probably have led to a
+    crash.  The pngmem.c implementation of png_malloc() included a cast
+    to png_size_t which would fail on large allocations on 16-bit systems.
+  Fix for the preprocessor of the Intel C compiler. The preprocessor
+    splits adjacent @ signs with a space; this changes the concatentation
+    token from @-@-@ to PNG_JOIN; that should work with all compiler
+    preprocessors.
+  Paeth filter speed improvements from work by Siarhei Siamashka. This
+    changes the 'Paeth' reconstruction function to improve the GCC code
+    generation on x86. The changes are only part of the suggested ones;
+    just the changes that definitely improve speed and remain simple.
+    The changes also slightly increase the clarity of the code.

-version 1.5.0beta02 [February 7, 2010]
-  Reverted to original png_push_save_buffer() code.
+Version 1.5.7beta02 [November 11, 2011]
+  Check compression_type parameter in png_get_iCCP and remove spurious
+    casts. The compression_type parameter is always assigned to, so must
+    be non-NULL. The cast of the profile length potentially truncated the
+    value unnecessarily on a 16-bit int system, so the cast of the (byte)
+    compression type to (int) is specified by ANSI-C anyway.
+  Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
+    the sBIT fields in the test pixel as 0, which resulted in a floating
+    point division by zero which was irrelevant but causes systems where
+    FP exceptions cause a crash. Added code to pngvalid to turn on FP
+    exceptions if the appropriate glibc support is there to ensure this is
+    tested in the future.
+  Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
+    new PNG_JOIN macro.
+  Added versioning to pnglibconf.h comments.
+  Simplified read/write API initial version; basic read/write tested on
+    a variety of images, limited documentation (in the header file.)
+  Installed more accurate linear to sRGB conversion tables. The slightly
+    modified tables reduce the number of 16-bit values that
+    convert to an off-by-one 8-bit value.  The "makesRGB.c" code that was used
+    to generate the tables is now in a contrib/sRGBtables sub-directory.

-version 1.5.0beta03 [February 8, 2010]
-  Return allocated "old_buffer" in png_push_save_buffer() before
-    calling png_error().
-  Updated configure script to use SO number 15.
+Version 1.5.7beta03 [November 17, 2011]
+  Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
+  Added run-time detection of NEON support.
+  Added contrib/libtests; includes simplified API test and timing test and
+    a color conversion utility for rapid checking of failed 'pngstest' results.
+  Multiple transform bug fixes plus a work-round for double gamma correction.
+    libpng does not support more than one transform that requires linear data
+    at once - if this is tried typically the results is double gamma
+    correction. Since the simplified APIs can need rgb to gray combined with
+    a compose operation it is necessary to do one of these outside the main
+    libpng transform code. This check-in also contains fixes to various bugs
+    in the simplified APIs themselves and to some bugs in compose and rgb to
+    gray (on palette) itself.
+  Fixes for C++ compilation using g++ When libpng source is compiled
+    using g++. The compiler imposes C++ rules on the C source; thus it
+    is desireable to make the source work with either C or C++ rules
+    without throwing away useful error information.  This change adds
+    png_voidcast to allow C semantic (void*) cases or the corresponding
+    C++ static_cast operation, as appropriate.
+  Added --noexecstack to assembler file compilation. GCC does not set
+    this on assembler compilation, even though it does on C compilation.
+    This creates security issues if assembler code is enabled; the
+    work-around is to set it by default in the flags for $(CCAS)
+  Work around compilers that don't support declaration of const data. Some
+    compilers fault 'extern const' data declarations (because the data is
+    not initialized); this turns on const-ness only for compilers where
+    this is known to work.

-version 1.5.0beta04 [February 9, 2010]
-  Removed malformed "incomplete struct declaration" of png_info from png.h
+Version 1.5.7beta04 [November 17, 2011]
+  Since the gcc driver does not recognize the --noexecstack flag, we must
+    use the -Wa prefix to have it passed through to the assembler.
+    Also removed a duplicate setting of this flag.
+  Added files that were omitted from the libpng-1.5.7beta03 zip distribution.

-version 1.5.0beta05 [February 12, 2010]
-  Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
-    linewrapping that it entailed.
-  Revised comments in pngstruct.h and pnginfo.h and added pointers to
-    the libpng license.
-  Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
-  Removed the cbuilder5 project, which has not been updated to 1.4.0.
+Version 1.5.7beta05 [November 25, 2011]
+  Removed "zTXt" from warning in generic chunk decompression function.
+  Validate time settings passed to pngset() and png_convert_to_rfc1123()
+    (Frank Busse).
+  Added MINGW support to CMakeLists.txt
+  Reject invalid compression flag or method when reading the iTXt chunk.
+  Backed out 'simplified' API changes. The API seems too complex and there
+    is a lack of consensus or enthusiasm for the proposals.  The API also
+    reveals significant bugs inside libpng (double gamma correction and the
+    known bug of being unable to retrieve a corrected palette). It seems
+    better to wait until the bugs, at least, are corrected.
+  Moved pngvalid.c into contrib/libtests
+  Rebuilt Makefile.in, configure, etc., with autoconf-2.68

-version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
-  Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
-    Nishikawa)
+Version 1.5.7rc01 [December 1, 2011]
+  Replaced an "#if" with "#ifdef" in pngrtran.c
+  Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)

-version 1.5.0beta07 [omitted]
+Version 1.5.7rc02 [December 5, 2011]
+  Revised project files and contrib/pngvalid/pngvalid.c to account for
+    the relocation of pngvalid into contrib/libtests.
+  Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
+    as in libpng-1.5.4.
+  Put CRLF line endings in the owatcom project files.

-version 1.5.0beta08 [February 19, 2010]
-  Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
-    wherever png_snprintf() is used to construct error and warning messages.
-  Noted in scripts/makefile.mingw that it expects to be run under MSYS.
-  Removed obsolete unused MMX-querying support from contrib/gregbook
-  Added exported png_longjmp() function.
-  Removed the AIX redefinition of jmpbuf in png.h
-  Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
-    when building on AIX.
-
-version 1.5.0beta09 [February 19, 2010]
-  Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
-  Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
-
-version 1.5.0beta10 [February 25, 2010]
-  Removed unused gzio.c from contrib/pngminim gather and makefile scripts
-  Removed replacement error handlers from contrib/gregbook.  Because of
-    the new png_longjmp() function they are no longer needed.
-
-version 1.5.0beta11 [March 6, 2010]
-  Removed checking for already-included setjmp.h from pngconf.h
-  Fixed inconsistent indentations and made numerous cosmetic changes.
-
-version 1.5.0beta12 [March 9, 2010]
-  Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
-    the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
-    and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
-  Created new pngdebug.h and moved debug definitions there.
-
-version 1.5.0beta13 [March 10, 2010]
-  Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
-  Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
-    PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
-    is defined.
-  Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
-  Moved the 'config.h' support from pngconf.h to pngpriv.h
-  Removed PNGAPI from the png_longjmp_ptr typedef.
-  Eliminated dependence of pngtest.c on the private pngdebug.h file.
-  Make all png_debug macros into *unterminated* statements or
-    expressions (i.e. a trailing ';' must always be added) and correct
-    the format statements in various png_debug messages.
-
-version 1.5.0beta14 [March 14, 2010]
-  Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
-  Revised Makefile.am to account for recent additions and replacements.
-  Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
-    added ordinal numbers to the Windows DEF file and corrected the duplicated
-    ordinal numbers on CE symbols that are commented out.
-  Added back in export symbols that can be present in the Windows build but
-    are disabled by default.
-  PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
-    PNG_CALLBACK added to make callback definitions uniform.  PNGAPI split
-    into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
-    and appropriate changes made to all files.  Cygwin builds re-hinged to
-    allow procedure call standard changes and to remove the need for the DEF
-    file (fixes build on Cygwin).
-  Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
-  Changed rules for generation of the various symbol files and added a new
-    rule for a DEF file (which is also added to the distribution).
-  Updated the symbol file generation to stop it adding spurious spaces
-    to EOL (coming from preprocessor macro expansion).  Added a facility
-    to join tokens in the output and rewrite *.dfn to use this.
-  Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
-    and removed scripts/makefile.cygwin.
-  Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
-  Removed the include of sys/types.h - apparently unnecessary now on the
-    platforms on which it happened (all but Mac OS and RISC OS).
-  Moved the Mac OS test into pngpriv.h (the only place it is used.)
-
-version 1.5.0beta15 [March 17, 2010]
-  Added symbols.chk target to Makefile.am to validate the symbols in png.h
-    against the new DEF file scripts/symbols.def.
-  Changed the default DEF file back to pngwin.def.
-  Removed makefile.mingw.
-  Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
-
-version 1.5.0beta16 [April 1, 2010]
-  Made png_text_struct independent of PNG_iTXt_SUPPORTED, so that
-    fields are initialized in all configurations.  The READ/WRITE
-    macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
-    before to disable code to actually read or write iTXt chunks
-    and iTXt_SUPPORTED can be used to detect presence of either
-    read or write support (but it is probably better to check for
-    the one actually required - read or write.)
-  Combined multiple png_warning() calls for a single error.
-  Restored the macro definition of png_check_sig().
-
-version 1.5.0beta17 [April 17, 2010]
-  Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
-  Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
-    more accurately what it actually does.  At the same time, renamed
-    the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
-    PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
-  Added some "(long)" typecasts to printf calls in png_handle_cHRM().
-  Freeze build-time only configuration in the build.
-    In all prior versions of libpng most configuration options
-    controlled by compiler #defines had to be repeated by the
-    application code that used libpng.  This patch changes this
-    so that compilation options that can only be changed at build
-    time are frozen in the build.  Options that are compiler
-    dependent (and those that are system dependent) are evaluated
-    each time - pngconf.h holds these.  Options that can be changed
-    per-file in the application are in png.h.  Frozen options are
-    in the new installed header file pnglibconf.h (John Bowler)
-  Removed the xcode project because it has not been updated to work
-    with libpng-1.5.0.
-
-version 1.5.0beta18 [April 18, 2010]
-  Restored the ability to include optional pngusr.h
-  Moved replacements for png_error() and png_warning() from the
-    contrib/pngminim project to pngerror.c, for use when warnings or
-    errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
-    storing unneeded error/warning text.
-  Updated contrib/pngminim project to work with the new pnglibconf.h
-  Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
+Version 1.5.7rc03 [December 8, 2011]
+  Updated CMakeLists.txt to account for the relocation of pngvalid.c

 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
--- a/2276
+++ b/2276
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,28 +1,41 @@
-cmake_minimum_required(VERSION 2.4.3)
-set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+# CMakeLists.txt

-if(UNIX AND NOT DEFINED CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING 
-      "Choose the type of build, options are:
-         None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
-         Debug
-         Release
-         RelWithDebInfo
-         MinSizeRel.")
-endif()
-
-project(libpng C)
-enable_testing()
-
-# Copyright (C) 2007-2010 Glenn Randers-Pehrson
+# Copyright (C) 2007-2011 Glenn Randers-Pehrson

 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h

+cmake_minimum_required(VERSION 2.4.4)
+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+
+if(UNIX AND NOT DEFINED CMAKE_BUILD_TYPE)
+  if(CMAKE_MAJOR_VERSION EQUAL 2 AND CMAKE_MINOR_VERSION EQUAL 4)
+    # workaround CMake 2.4.x bug
+    set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
+        "Choose the type of build, options are:
+           None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
+           Debug
+           Release
+           RelWithDebInfo
+           MinSizeRel.")
+  else()
+    set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
+        "Choose the type of build, options are:
+           None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used)
+           Debug
+           Release
+           RelWithDebInfo
+           MinSizeRel.")
+  endif()
+endif()
+
+project(libpng C)
+enable_testing()
+
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
-set(PNGLIB_RELEASE 0)
+set(PNGLIB_RELEASE 7)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})

@@ -56,39 +69,11 @@ else()
  option(PNG_STATIC "Build static lib" ON)
 endif()

-if(MINGW)
-  option(PNG_TESTS  "Build pngtest" NO)
-else()
-  option(PNG_TESTS  "Build pngtest" YES)
-endif()
+option(PNG_TESTS  "Build libpng tests" YES)

-option(PNG_NO_CONSOLE_IO "FIXME" YES)
-option(PNG_NO_STDIO      "FIXME" YES)
+# Many more configuration options could be added here
 option(PNG_DEBUG         "Build with debug output" NO)
-option(PNGARG            "FIXME" YES)
-#TODO:
-# PNG_CONSOLE_IO_SUPPORTED
-
-# maybe needs improving, but currently I don't know when we can enable what :)
-set(png_asm_tmp "OFF")
-if(NOT WIN32)
-  find_program(uname_executable NAMES uname PATHS /bin /usr/bin /usr/local/bin)
-  if(uname_executable)
-    exec_program(${uname_executable}
-                 ARGS --machine OUTPUT_VARIABLE uname_output)
-    if("uname_output" MATCHES "^.*i[1-9]86.*$")
-      set(png_asm_tmp "ON")
-    else("uname_output" MATCHES "^.*i[1-9]86.*$")
-      set(png_asm_tmp "OFF")
-    endif("uname_output" MATCHES "^.*i[1-9]86.*$")
-  endif(uname_executable)
-else()
-  # this env var is normally only set on win64
-  set(TEXT "ProgramFiles(x86)")
-  if("$ENV{${TEXT}}" STREQUAL "")
-    set(png_asm_tmp "ON")
-  endif("$ENV{${TEXT}}" STREQUAL "")
-endif()
+option(PNGARG            "Disable ANSI-C prototypes" NO)

 # SET LIBNAME
 set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
@@ -96,12 +81,26 @@ set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")

+# Use the prebuilt pnglibconf.h file from the scripts folder
+# TODO: fix this by building with awk; without this no cmake build can be
+# configured directly (to do so indirectly use your local awk to build a
+# pnglibconf.h in the build directory.)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
+               ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})

 # OUR SOURCES
-set(libpng_sources
+set(libpng_public_hdrs
  png.h
  pngconf.h
+  ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h
+)
+set(libpng_sources
+  ${libpng_public_hdrs}
+  pngdebug.h
+  pnginfo.h
  pngpriv.h
+  pngstruct.h
  png.c
  pngerror.c
  pngget.c
@@ -121,36 +120,19 @@ set(libpng_sources
 set(pngtest_sources
  pngtest.c
 )
+set(pngvalid_sources
+  contrib/libtests/pngvalid.c
+)
 # SOME NEEDED DEFINITIONS

+add_definitions(-DPNG_CONFIGURE_LIBPNG)
+
 if(MSVC)
  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)

-if(PNG_SHARED OR  NOT MSVC)
-  #if building msvc static this has NOT to be defined
-  add_definitions(-DZLIB_DLL)
-endif()
-
-
-if(PNG_CONSOLE_IO_SUPPORTED)
-  add_definitions(-DPNG_CONSOLE_IO_SUPPORTED)
-endif()
-
-if(PNG_NO_CONSOLE_IO)
-  add_definitions(-DPNG_NO_CONSOLE_IO)
-endif()
-
-if(PNG_NO_STDIO)
-  add_definitions(-DPNG_NO_STDIO)
-endif()
-
 if(PNG_DEBUG)
-  add_definitions(-DPNG_DEBUG=1)
-endif()
-
-if(NOT M_LIBRARY AND NOT WIN32)
-  add_definitions(-DPNG_NO_FLOATING_POINT_SUPPORTED)
+  add_definitions(-DPNG_DEBUG)
 endif()

 # NOW BUILD OUR TARGET
@@ -161,6 +143,7 @@ if(PNG_SHARED)
  if(MSVC)
    # msvc does not append 'lib' - do it here to have consistent name
    set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
+    set_target_properties(${PNG_LIB_NAME} PROPERTIES IMPORT_PREFIX "lib")
  endif()
  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()
@@ -173,9 +156,9 @@ if(PNG_STATIC)
    # msvc does not append 'lib' - do it here to have consistent name
    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
  endif()
+  target_link_libraries(${PNG_LIB_NAME_STATIC} ${ZLIB_LIBRARY} ${M_LIBRARY})
 endif()

-
 if(PNG_SHARED AND WIN32)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
 endif()
@@ -184,61 +167,138 @@ if(PNG_TESTS AND PNG_SHARED)
  # does not work with msvc due to png_lib_ver issue
  add_executable(pngtest ${pngtest_sources})
  target_link_libraries(pngtest ${PNG_LIB_NAME})
-  add_test(pngtest pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
+  add_test(pngtest ./pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
+  #
+  add_executable(pngvalid ${pngvalid_sources})
+  target_link_libraries(pngvalid ${PNG_LIB_NAME})
+  add_test(pngvalid ./pngvalid)
 endif()

+# Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set
+IF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+  IF(WIN32)
+    SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "bin")
+  ELSE(WIN32)
+    SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "lib")
+  ENDIF(WIN32)
+ENDIF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+
+# Set a variable with CMake code which:
+# Creates a symlink from src to dest (if possible) or alternatively
+# copies if different.
+macro(CREATE_SYMLINK SRC_FILE DEST_FILE)
+  FILE(REMOVE ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
+  if(WIN32 AND NOT CYGWIN AND NOT MINGW)
+    ADD_CUSTOM_COMMAND(
+        OUTPUT ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}   ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
+        COMMAND ${CMAKE_COMMAND} -E copy        ${CMAKE_CURRENT_BINARY_DIR}/${SRC_FILE} ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}
+        COMMAND ${CMAKE_COMMAND} -E copy        ${CMAKE_CURRENT_BINARY_DIR}/${SRC_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
+        DEPENDS ${PNG_LIB_NAME} ${PNG_LIB_NAME_STATIC}
+        )
+    ADD_CUSTOM_TARGET(${DEST_FILE}_COPY ALL DEPENDS ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
+  else(WIN32 AND NOT CYGWIN AND NOT MINGW)
+    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${SRC_FILE} ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${SRC_FILE} ${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+  endif(WIN32 AND NOT CYGWIN AND NOT MINGW)
+endmacro()
+
+# libpng is a library so default to 'lib'
+if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
+  set(CMAKE_INSTALL_LIBDIR lib)
+endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)

 # CREATE PKGCONFIG FILES
 # we use the same files like ./configure, so we have to set its vars
+# Only do this on Windows for Cygwin - the files don't make much sense outside
+# a UNIX look alike
+if(NOT WIN32 OR CYGWIN OR MINGW) 
 set(prefix      ${CMAKE_INSTALL_PREFIX})
 set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)
+set(libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
 set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
+set(LIBS        "-lz -lm")
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
+CREATE_SYMLINK(${PNGLIB_NAME}.pc libpng.pc)

-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
-  ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
-  ${CMAKE_CURRENT_BINARY_DIR}/libpng-config)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
-  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
-  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config)
+  ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
+CREATE_SYMLINK(${PNGLIB_NAME}-config libpng-config)
+endif(NOT WIN32 OR CYGWIN OR MINGW)

 # SET UP LINKS
 if(PNG_SHARED)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.0beta18
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.7rc03
    VERSION 15.${PNGLIB_RELEASE}.0
    SOVERSION 15
    CLEAN_DIRECT_OUTPUT 1)
 endif()
 if(PNG_STATIC)
-  if(NOT WIN32)
-    # that's uncool on win32 - it overwrites our static import lib...
+  # MSVC doesn't use a different file extension for shared vs. static
+  # libs.  We are able to change OUTPUT_NAME to remove the _static
+  # for all other platforms.
+  if(NOT MSVC)
    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
      OUTPUT_NAME ${PNG_LIB_NAME}
      CLEAN_DIRECT_OUTPUT 1)
  endif()
 endif()

+# If CMake > 2.4.x, we set a variable used below to export
+# targets to an export file.
+# TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
+if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
+  set(PNG_EXPORT_RULE EXPORT libpng)
+elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
+  set(PNG_EXPORT_RULE EXPORT libpng)
+endif()
+
 # INSTALL
 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
  if(PNG_SHARED)
    install(TARGETS ${PNG_LIB_NAME}
-            RUNTIME DESTINATION bin
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
-  endif()
+        ${PNG_EXPORT_RULE}
+        RUNTIME DESTINATION bin
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+    # Create a symlink for libpng.dll.a => libpng15.dll.a on Cygwin
+    if(CYGWIN OR MINGW)
+       get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
+       get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+       CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
+       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
+         DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    endif(CYGWIN OR MINGW)
+
+    if(NOT WIN32)
+      get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
+      get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+      CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
+      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
+         DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    endif(NOT WIN32)
+  endif(PNG_SHARED)
+
  if(PNG_STATIC)
    install(TARGETS ${PNG_LIB_NAME_STATIC}
-            LIBRARY DESTINATION lib
-            ARCHIVE DESTINATION lib)
-  endif()
+        ${PNG_EXPORT_RULE}
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    if(NOT WIN32 OR CYGWIN OR MINGW)
+      get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME_STATIC} LOCATION_${CMAKE_BUILD_TYPE})
+      get_filename_component(BUILD_TARGET_FILE ${BUILD_TARGET_LOCATION} NAME)
+      CREATE_SYMLINK(${BUILD_TARGET_FILE} libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
+      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
+         DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    endif(NOT WIN32 OR CYGWIN OR MINGW)
+ endif()
 endif()

 if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
-  install(FILES png.h pngconf.h         DESTINATION include)
-  install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})
+  install(FILES ${libpng_public_hdrs}   DESTINATION include)
+  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
 endif()
 if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
@@ -247,26 +307,33 @@ if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
 endif()
 if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
  # Install man pages
-  install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
-  install(FILES png.5                           DESTINATION man/man5)
+  if(NOT PNG_MAN_DIR)
+    set(PNG_MAN_DIR "share/man")
+  endif()
+  install(FILES libpng.3 libpngpf.3      DESTINATION ${PNG_MAN_DIR}/man3)
+  install(FILES png.5                    DESTINATION ${PNG_MAN_DIR}/man5)
  # Install pkg-config files
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
-          DESTINATION lib/pkgconfig)
-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
          DESTINATION bin)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
-          DESTINATION lib/pkgconfig)
-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
          DESTINATION bin)
 endif()

-# what's with libpng.txt and all the extra files?
+# On versions of CMake that support it, create an export file CMake
+# users can include() to import our targets
+if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
+  install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
+endif()

+# what's with libpng-$VER%.txt and all the extra files?

 # UNINSTALL
 # do we need this?

-
 # DIST
 # do we need this?

--- a/66
+++ b/66
@@ -1,5 +1,5 @@

-Installing libpng version 1.5.0beta18 - April 18, 2010
+Installing libpng

 On Unix/Linux and similar systems, you can simply type

@@ -13,10 +13,16 @@ If configure does not work on your system and you have a reasonably
 up-to-date set of tools, running ./autogen.sh before running ./configure
 may fix the problem.  You can also run the individual commands in
 autogen.sh with the --force option, if supported by your version of
-the tools.  If you run 'libtoolize --force', though, this will replace
-the distributed, patched, version of ltmain.sh with an unpatched version
-and your shared library builds may fail to produce libraries with the
-correct version numbers.
+the tools.  To be really sure that you aren't using any of the included
+pre-built scripts, you can do this:
+
+    ./configure --enable-maintainer-mode
+    make maintainer-clean
+    ./autogen.sh
+    ./configure [--prefix=/path] [other options]
+    make
+    make install
+    make check

 Instead, you can use one of the custom-built makefiles in the
 "scripts" directory
@@ -46,8 +52,8 @@ to have access to the 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-1.5.0beta18" or "libpng15" and "zlib-1.2.3"
-or "zlib123") so that you have directories called "zlib" and "libpng".
+might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.5"
+or "zlib125") so that you have directories called "zlib" and "libpng".

 Your directory structure should look like this:

@@ -60,8 +66,8 @@ Your directory structure should look like this:
          CMakeLists.txt    =>  "cmake" script
          configuration files:
             configure.ac, configure, Makefile.am, Makefile.in,
-             autogen.sh, config.guess, ltmain.sh, missing,
-             aclocal.m4, config.h.in, config.sub,
+             autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
+             libpng-config.in, aclocal.m4, config.h.in, config.sub,
             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
          contrib
             gregbook
@@ -70,13 +76,12 @@ Your directory structure should look like this:
             pngsuite
             visupng
          projects
-             cbuilder5 (Borland)
-             visualc6 (msvc)
             visualc71
-             xcode
+             vstudio
          scripts
             makefile.*
             *.def (module definition files)
+             etc.
          pngtest.png
          etc.
      zlib
@@ -107,7 +112,7 @@ scripts directory into this directory, for example
 Read the makefile to see if you need to change any source or
 target directories to match your preferences.

-Then read pngconf.h to see if you want to make any configuration
+Then read pnglibconf.dfa to see if you want to make any configuration
 changes.

 Then just run "make" which will create the libpng library in
@@ -125,19 +130,26 @@ do that, run "make install" in the zlib directory first if necessary).
 Some also allow you to run "make test-installed" after you have
 run "make install".

-If you encounter a compiler error message complaining about the
-lines
-
-      __png.h__ already includes setjmp.h;
-      __dont__ include it again.;
-
-this means you have compiled another module that includes setjmp.h,
-which is hazardous because the two modules might not include exactly
-the same setjmp.h.  If you are sure that you know what you are doing
-and that they are exactly the same, then you can comment out or
-delete the two lines.  Better yet, use the cexcept interface
-instead, as demonstrated in contrib/visupng of the libpng distribution.
-
-Further information can be found in the README and libpng.txt
+Further information can be found in the README and libpng-manual.txt
 files, in the individual makefiles, in png.h, and the manual pages
 libpng.3 and png.5.
+
+Using the ./configure script -- 16 December 2002.
+=================================================
+
+The ./configure script should work compatibly with what scripts/makefile.*
+did, however there are some options you might need to add to configure
+explicitly, which previously was done semi-automatically (if you didn't edit
+scripts/makefile.* yourself, that is)
+
+CFLAGS="-Wall -O -funroll-loops \
+-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
+--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
+
+You can alternatively specify --includedir=/usr/include, /usr/local/include,
+/usr/include/libpng%NN%, or whatever.
+
+If you find that the configure script is out-of-date or is not supporting
+your platform properly, try running autogen.sh to regenerate "configure",
+"Makefile.in", and the other configuration files. Then try configure again.
+
--- a/6
+++ b/6
@@ -10,8 +10,8 @@ this sentence.

 This code is released under the libpng license.

-libpng versions 1.2.6, August 15, 2004, through 1.5.0beta18, April 18, 2010, are
-Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+libpng versions 1.2.6, August 15, 2004, through 1.5.7rc03, December 8, 2011, are
+Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors

@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-April 18, 2010
+December 8, 2011
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,31 +5,44 @@
 PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@

 # libpng does not follow GNU file name conventions
-AUTOMAKE_OPTIONS = foreign color-tests
+
+# "color-tests" requires automake 1.11.1 or later.  Enable it if you like,
+# to get red "FAIL" and green "PASS" notations during tests.
+# AUTOMAKE_OPTIONS = foreign color-tests
+AUTOMAKE_OPTIONS = foreign

 # test programs - run on make check, make distcheck
+TESTS_ENVIRONMENT= srcdir=$(srcdir)
 check_PROGRAMS= pngtest
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 TESTS = test-pngtest.sh
-TESTS_ENVIRONMENT= srcdir=$(srcdir) 
+
+# Only do the following if the contrib directory is present.
+check_PROGRAMS+= pngvalid
+pngvalid_SOURCES = contrib/libtests/pngvalid.c
+pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+TESTS += test-pngvalid-simple.sh test-pngvalid-full.sh

 # man pages
 dist_man_MANS= libpng.3 libpngpf.3 png.5

 # generate the -config scripts if required
-binconfigs= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config 
+binconfigs= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
 EXTRA_SCRIPTS= libpng-config libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
 bin_SCRIPTS= @binconfigs@

 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES=libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngset.c pngget.c pngrutil.c \
-	pngtrans.c pngwutil.c \
-	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
-	pngwtran.c pngmem.c pngerror.c pngpread.c \
-	png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
+	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
+	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
+	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+if PNG_ARM_NEON
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/filter_neon.S
+endif

 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h

@@ -39,11 +52,16 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined -export-dynamic \
 	-version-number @PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0

 if HAVE_LD_VERSION_SCRIPT
-  # Versioned symbols and restricted exports
+#   Versioned symbols and restricted exports
+if HAVE_SOLARIS_LD
+  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,-M -Wl,libpng.vers
+else
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,--version-script=libpng.vers
+endif
+
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.vers
 else
-  # Only restricted exports when possible
+#   Only restricted exports when possible
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -export-symbols libpng.sym
  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
 endif
@@ -62,28 +80,27 @@ pkgconfig_DATA = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc
 EXTRA_DIST= \
 	ANNOUNCE CHANGES INSTALL LICENSE README TODO \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
-	${srcdir}/projects/visualc6/* \
-	${srcdir}/projects/visualc71/* \
-	${srcdir}/projects/xcode/* \
-	${srcdir}/scripts/* \
-	${srcdir}/contrib/gregbook/* \
-	${srcdir}/contrib/pngminim/* \
-	${srcdir}/contrib/pngminus/* \
-	${srcdir}/contrib/pngsuite/* \
-	${srcdir}/contrib/visupng/* \
+	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) \
-	CMakeLists.txt example.c libpng-@PNGLIB_VERSION@.txt
+	CMakeLists.txt example.c libpng-manual.txt

 SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk scripts/pnglibconf.dfn

 CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
-	pngwin.def check.new pnglibconf.* symbols.new \
+	check.new pnglibconf.* symbols.new pngtest-log.txt \
 	$(SCRIPT_CLEANFILES)

 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
+
 SUFFIXES = .chk .dfn .out

 $(PNGLIB_BASENAME).pc: libpng.pc
@@ -93,7 +110,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 	cp libpng-config $@

 scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
-scripts/symbols.out scripts/pngwin.out: png.h pngconf.h scripts/pnglibconf.h
+scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt

 libpng.sym: scripts/sym.out
 	rm -f $@
@@ -101,45 +118,51 @@ libpng.sym: scripts/sym.out
 libpng.vers: scripts/vers.out
 	rm -f $@
 	cp $? $@
-pngwin.def: scripts/pngwin.out
-	rm -f $@
-	cp $? $@
 pnglibconf.h: pnglibconf.out
 	rm -f $@
 	cp $? $@
-scripts/pnglibconf.h:
+$(srcdir)/scripts/pnglibconf.h.prebuilt:
+	@echo "Attempting to build $@" >&2
 	@echo "This is a machine generated file, but if you want to make" >&2
 	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1

+# The following is necessary to ensure that the local pnglibconf.h is used, not
+# an installed one (this can happen immediately after on a clean system if
+# 'make test' is the first thing the user does.)
+contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h
+
+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this prevents the read macros from
+# interfering with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE

 .dfn.out:
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
-	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c >dfn1.out
-	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
+	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
+	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
-	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
+	$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out
 	rm -f dfn.c dfn[12].out
 	mv dfn3.out $@

 # The .dfn file for pnglibconf.h is machine generated
-pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
+pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ dfn?.out
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=1 out=dfn1.out\
-	    ${srcdir}/scripts/pnglibconf.dfa 1>&2
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=0 out=dfn2.out\
-	    dfn1.out 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out version=search\
+	    ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
+	    $(DFA_XTRA) 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@

 # Symbol checks (.def and .out files should match)
-scripts/pngwin.chk: scripts/checksym.awk scripts/pngwin.def scripts/pngwin.out
 scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
 .out.chk:
 	rm -f $@ symbols.new
@@ -149,14 +172,14 @@ scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.ou

 # used on demand to regenerate the standard header, CPPFLAGS should
 # be empty - no non-standard defines
-scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
+scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ dfn?.out
-	test -z "$(CPPFLAGS)" 
+	test -z "$(CPPFLAGS)"
 	echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=1 out=dfn1.out\
-	    logunsupported=1 - ${srcdir}/scripts/pnglibconf.dfa 1>&2
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=0 out=dfn2.out\
-	    logunsupported=1 dfn1.out 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out logunsupported=1
+		version=search ${srcdir}/pngconf.h -\
+		${srcdir}/scripts/pnglibconf.dfa 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@

@@ -166,7 +189,7 @@ $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
 test: check-am

 # Extra checks
-check: scripts/symbols.chk scripts/pngwin.chk
+check: scripts/symbols.chk

 # Don't distribute the generated script files
 dist-hook:
@@ -189,7 +212,7 @@ install-exec-hook:
 	cd $(DESTDIR)$(bindir); $(LN_S) $(PNGLIB_BASENAME)-config libpng-config
 	@set -x;\
 	cd $(DESTDIR)$(libdir);\
-	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib; do\
+	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib dll.a; do\
 		rm -f libpng.$$ext;\
                if test -f $(PNGLIB_BASENAME).$$ext; then\
                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.11 from Makefile.am.
+# Makefile.in generated by automake 1.11.1 from Makefile.am.
 # @configure_input@

 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -40,23 +40,28 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
-check_PROGRAMS = pngtest$(EXEEXT)
-@HAVE_LD_VERSION_SCRIPT_TRUE@am__append_1 = -Wl,--version-script=libpng.vers
-@HAVE_LD_VERSION_SCRIPT_FALSE@am__append_2 = -export-symbols libpng.sym
+check_PROGRAMS = pngtest$(EXEEXT) pngvalid$(EXEEXT)
+@PNG_ARM_NEON_TRUE@am__append_1 = arm/filter_neon.S
+
+#   Versioned symbols and restricted exports
+@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_TRUE@am__append_2 = -Wl,-M -Wl,libpng.vers
+@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_FALSE@am__append_3 = -Wl,--version-script=libpng.vers
+#   Only restricted exports when possible
+@HAVE_LD_VERSION_SCRIPT_FALSE@am__append_4 = -export-symbols libpng.sym
 subdir = .
 DIST_COMMON = README $(am__configure_deps) $(dist_man_MANS) \
 	$(pkginclude_HEADERS) $(srcdir)/Makefile.am \
 	$(srcdir)/Makefile.in $(srcdir)/config.h.in \
 	$(srcdir)/libpng-config.in $(srcdir)/libpng.pc.in \
 	$(top_srcdir)/configure INSTALL TODO config.guess config.sub \
-	depcomp install-sh ltmain.sh missing mkinstalldirs
+	depcomp install-sh ltmain.sh missing
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \
 configure.lineno config.status.lineno
-mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
+mkinstalldirs = $(install_sh) -d
 CONFIG_HEADER = config.h
 CONFIG_CLEAN_FILES = libpng.pc libpng-config
 CONFIG_CLEAN_VPATH_FILES =
@@ -87,22 +92,29 @@ am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(bindir)" \
 	"$(DESTDIR)$(pkgincludedir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LIBADD =
+am__libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES_DIST = png.c \
+	pngerror.c pngget.c pngmem.c pngpread.c pngread.c pngrio.c \
+	pngrtran.c pngrutil.c pngset.c pngtrans.c pngwio.c pngwrite.c \
+	pngwtran.c pngwutil.c png.h pngconf.h pngdebug.h pnginfo.h \
+	pngpriv.h pngstruct.h arm/filter_neon.S
+@PNG_ARM_NEON_TRUE@am__objects_1 = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo
 am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrio.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrutil.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo \
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngtrans.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo \
+	$(am__objects_1)
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	$(am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS) \
@@ -115,11 +127,19 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LINK = $(LIBTOOL) --tag=CC \
 am_pngtest_OBJECTS = pngtest.$(OBJEXT)
 pngtest_OBJECTS = $(am_pngtest_OBJECTS)
 pngtest_DEPENDENCIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+am_pngvalid_OBJECTS = pngvalid.$(OBJEXT)
+pngvalid_OBJECTS = $(am_pngvalid_OBJECTS)
+pngvalid_DEPENDENCIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 SCRIPTS = $(bin_SCRIPTS)
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp = $(SHELL) $(top_srcdir)/depcomp
 am__depfiles_maybe = depfiles
 am__mv = mv -f
+CPPASCOMPILE = $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
+LTCPPASCOMPILE = $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
+	--mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
 LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
@@ -131,9 +151,10 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	$(LDFLAGS) -o $@
 SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
 	$(nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
-	$(pngtest_SOURCES)
-DIST_SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
-	$(pngtest_SOURCES)
+	$(pngtest_SOURCES) $(pngvalid_SOURCES)
+DIST_SOURCES =  \
+	$(am__libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES_DIST) \
+	$(pngtest_SOURCES) $(pngvalid_SOURCES)
 man3dir = $(mandir)/man3
 man5dir = $(mandir)/man5
 NROFF = nroff
@@ -142,21 +163,8 @@ DATA = $(pkgconfig_DATA)
 HEADERS = $(nodist_pkginclude_HEADERS) $(pkginclude_HEADERS)
 ETAGS = etags
 CTAGS = ctags
-# If stdout is a non-dumb tty, use colors.  If test -t is not supported,
-# then this fails; a conservative approach.  Of course do not redirect
-# stdout here, just stderr.
 am__tty_colors = \
-red=; grn=; lgn=; blu=; std=; \
-test "X$(AM_COLOR_TESTS)" != Xno \
-&& test "X$$TERM" != Xdumb \
-&& { test "X$(AM_COLOR_TESTS)" = Xalways || test -t 1 2>/dev/null; } \
-&& { \
-  red='[0;31m'; \
-  grn='[0;32m'; \
-  lgn='[1;32m'; \
-  blu='[1;34m'; \
-  std='[m'; \
-}
+red=; grn=; lgn=; blu=; std=
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -173,6 +181,7 @@ distcleancheck_listfiles = find . -type f -print
 pkgincludedir = $(includedir)/$(PNGLIB_BASENAME)
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
+AM_CCASFLAGS = @AM_CCASFLAGS@
 AR = @AR@
 AS = @AS@
 AUTOCONF = @AUTOCONF@
@@ -180,6 +189,9 @@ AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
 AWK = @AWK@
 CC = @CC@
+CCAS = @CCAS@
+CCASDEPMODE = @CCASDEPMODE@
+CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
@@ -187,6 +199,13 @@ CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
+
+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
 DLLTOOL = @DLLTOOL@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
@@ -213,6 +232,7 @@ LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
 MKDIR_P = @MKDIR_P@
 NM = @NM@
 NMEDIT = @NMEDIT@
@@ -244,6 +264,7 @@ abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@
 abs_top_builddir = @abs_top_builddir@
 abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
 ac_ct_CC = @ac_ct_CC@
 ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
 am__include = @am__include@
@@ -253,7 +274,7 @@ am__tar = @am__tar@
 am__untar = @am__untar@

 # generate the -config scripts if required
-binconfigs = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config 
+binconfigs = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
 bindir = @bindir@
 build = @build@
 build_alias = @build_alias@
@@ -279,7 +300,6 @@ libdir = @libdir@
 libexecdir = @libexecdir@
 localedir = @localedir@
 localstatedir = @localstatedir@
-lt_ECHO = @lt_ECHO@
 mandir = @mandir@
 mkdir_p = @mkdir_p@
 oldincludedir = @oldincludedir@
@@ -302,11 +322,19 @@ top_srcdir = @top_srcdir@
 PNGLIB_BASENAME = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@

 # libpng does not follow GNU file name conventions
-AUTOMAKE_OPTIONS = foreign color-tests
+
+# "color-tests" requires automake 1.11.1 or later.  Enable it if you like,
+# to get red "FAIL" and green "PASS" notations during tests.
+# AUTOMAKE_OPTIONS = foreign color-tests
+AUTOMAKE_OPTIONS = foreign
+
+# test programs - run on make check, make distcheck
+TESTS_ENVIRONMENT = srcdir=$(srcdir)
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-TESTS = test-pngtest.sh
-TESTS_ENVIRONMENT = srcdir=$(srcdir) 
+TESTS = test-pngtest.sh test-pngvalid-simple.sh test-pngvalid-full.sh
+pngvalid_SOURCES = contrib/libtests/pngvalid.c
+pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la

 # man pages
 dist_man_MANS = libpng.3 libpngpf.3 png.5
@@ -316,18 +344,17 @@ bin_SCRIPTS = @binconfigs@
 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngset.c pngget.c pngrutil.c \
-	pngtrans.c pngwutil.c \
-	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
-	pngwtran.c pngmem.c pngerror.c pngpread.c \
-	png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h
-
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c \
+	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c \
+	pngrutil.c pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c \
+	pngwutil.c png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h \
+	pngstruct.h $(am__append_1)
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined \
 	-export-dynamic -version-number \
 	@PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0 \
-	$(am__append_1) $(am__append_2)
+	$(am__append_2) $(am__append_3) $(am__append_4)
@HAVE_LD_VERSION_SCRIPT_FALSE@libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
@HAVE_LD_VERSION_SCRIPT_TRUE@libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.vers
 pkginclude_HEADERS = png.h pngconf.h
@@ -338,37 +365,34 @@ pkgconfig_DATA = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc
 EXTRA_DIST = \
 	ANNOUNCE CHANGES INSTALL LICENSE README TODO \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
-	${srcdir}/projects/visualc6/* \
-	${srcdir}/projects/visualc71/* \
-	${srcdir}/projects/xcode/* \
-	${srcdir}/scripts/* \
-	${srcdir}/contrib/gregbook/* \
-	${srcdir}/contrib/pngminim/* \
-	${srcdir}/contrib/pngminus/* \
-	${srcdir}/contrib/pngsuite/* \
-	${srcdir}/contrib/visupng/* \
+	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) \
-	CMakeLists.txt example.c libpng-@PNGLIB_VERSION@.txt
+	CMakeLists.txt example.c libpng-manual.txt

 SCRIPT_CLEANFILES = scripts/*.out scripts/*.chk scripts/pnglibconf.dfn
 CLEANFILES = dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
-	pngwin.def check.new pnglibconf.* symbols.new \
+	check.new pnglibconf.* symbols.new pngtest-log.txt \
 	$(SCRIPT_CLEANFILES)

 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

 SUFFIXES = .chk .dfn .out
+
+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this prevents the read macros from
+# interfering with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE

 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am

 .SUFFIXES:
-.SUFFIXES: .chk .dfn .out .c .lo .o .obj
+.SUFFIXES: .chk .dfn .out .S .c .lo .o .obj
 am--refresh:
 	@:
 $(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
@@ -469,6 +493,9 @@ clean-checkPROGRAMS:
 pngtest$(EXEEXT): $(pngtest_OBJECTS) $(pngtest_DEPENDENCIES) 
 	@rm -f pngtest$(EXEEXT)
 	$(LINK) $(pngtest_OBJECTS) $(pngtest_LDADD) $(LIBS)
+pngvalid$(EXEEXT): $(pngvalid_OBJECTS) $(pngvalid_DEPENDENCIES) 
+	@rm -f pngvalid$(EXEEXT)
+	$(LINK) $(pngvalid_OBJECTS) $(pngvalid_LDADD) $(LIBS)
 install-binSCRIPTS: $(bin_SCRIPTS)
 	@$(NORMAL_INSTALL)
 	test -z "$(bindir)" || $(MKDIR_P) "$(DESTDIR)$(bindir)"
@@ -510,6 +537,7 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c

+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.Plo@am__quote@
@@ -526,6 +554,35 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngtest.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngvalid.Po@am__quote@
+
+.S.o:
+@am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ $<
+
+.S.obj:
+@am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.S.lo:
+@am__fastdepCCAS_TRUE@	$(LTCPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(LTCPPASCOMPILE) -c -o $@ $<
+
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo: arm/filter_neon.S
+@am__fastdepCCAS_TRUE@	$(LIBTOOL)  $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo `test -f 'arm/filter_neon.S' || echo '$(srcdir)/'`arm/filter_neon.S
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Plo
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='arm/filter_neon.S' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(LIBTOOL)  $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo `test -f 'arm/filter_neon.S' || echo '$(srcdir)/'`arm/filter_neon.S

 .c.o:
@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
@@ -555,12 +612,12 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo: png.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo `test -f 'png.c' || echo '$(srcdir)/'`png.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngset.lo: pngset.c
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 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngread.lo: pngread.c
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@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo `test -f 'pngwrite.c' || echo '$(srcdir)/'`pngwrite.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo: pngrtran.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngrtran.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo' libtool=yes @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngrtran.lo `test -f 'pngrtran.c' || echo '$(srcdir)/'`pngrtran.c
-
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo: pngwtran.c
@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo `test -f 'pngwtran.c' || echo '$(srcdir)/'`pngwtran.c
@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.Plo
@@ -632,26 +703,26 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo: pngwtran.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo `test -f 'pngwtran.c' || echo '$(srcdir)/'`pngwtran.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo: pngmem.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngmem.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo' libtool=yes @AMDEPBACKSLASH@
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo: pngwutil.c
+@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngwutil.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngmem.lo `test -f 'pngmem.c' || echo '$(srcdir)/'`pngmem.c
+@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo `test -f 'pngwutil.c' || echo '$(srcdir)/'`pngwutil.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo: pngerror.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngerror.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo' libtool=yes @AMDEPBACKSLASH@
+pngvalid.o: contrib/libtests/pngvalid.c
+@am__fastdepCC_TRUE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT pngvalid.o -MD -MP -MF $(DEPDIR)/pngvalid.Tpo -c -o pngvalid.o `test -f 'contrib/libtests/pngvalid.c' || echo '$(srcdir)/'`contrib/libtests/pngvalid.c
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/pngvalid.Tpo $(DEPDIR)/pngvalid.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='contrib/libtests/pngvalid.c' object='pngvalid.o' libtool=no @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo `test -f 'pngerror.c' || echo '$(srcdir)/'`pngerror.c
+@am__fastdepCC_FALSE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o pngvalid.o `test -f 'contrib/libtests/pngvalid.c' || echo '$(srcdir)/'`contrib/libtests/pngvalid.c

-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo: pngpread.c
-@am__fastdepCC_TRUE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
-@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.Plo
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='pngpread.c' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo' libtool=yes @AMDEPBACKSLASH@
+pngvalid.obj: contrib/libtests/pngvalid.c
+@am__fastdepCC_TRUE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT pngvalid.obj -MD -MP -MF $(DEPDIR)/pngvalid.Tpo -c -o pngvalid.obj `if test -f 'contrib/libtests/pngvalid.c'; then $(CYGPATH_W) 'contrib/libtests/pngvalid.c'; else $(CYGPATH_W) '$(srcdir)/contrib/libtests/pngvalid.c'; fi`
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/pngvalid.Tpo $(DEPDIR)/pngvalid.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='contrib/libtests/pngvalid.c' object='pngvalid.obj' libtool=no @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(LIBTOOL)  --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
+@am__fastdepCC_FALSE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o pngvalid.obj `if test -f 'contrib/libtests/pngvalid.c'; then $(CYGPATH_W) 'contrib/libtests/pngvalid.c'; else $(CYGPATH_W) '$(srcdir)/contrib/libtests/pngvalid.c'; fi`

 mostlyclean-libtool:
 	-rm -f *.lo
@@ -991,7 +1062,8 @@ distdir: $(DISTFILES)
 	  top_distdir="$(top_distdir)" distdir="$(distdir)" \
 	  dist-hook
 	-test -n "$(am__skip_mode_fix)" \
-	|| find "$(distdir)" -type d ! -perm -777 -exec chmod a+rwx {} \; -o \
+	|| find "$(distdir)" -type d ! -perm -755 \
+		-exec chmod u+rwx,go+rx {} \; -o \
 	  ! -type d ! -perm -444 -links 1 -exec chmod a+r {} \; -o \
 	  ! -type d ! -perm -400 -exec chmod a+r {} \; -o \
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
@@ -1035,17 +1107,17 @@ dist dist-all: distdir
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gunzip -c $(distdir).tar.gz | $(am__untar) ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
-	  bunzip2 -c $(distdir).tar.bz2 | $(am__untar) ;;\
+	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lzma*) \
-	  unlzma -c $(distdir).tar.lzma | $(am__untar) ;;\
+	  lzma -dc $(distdir).tar.lzma | $(am__untar) ;;\
 	*.tar.xz*) \
 	  xz -dc $(distdir).tar.xz | $(am__untar) ;;\
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gunzip -c $(distdir).shar.gz | unshar ;;\
+	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac
@@ -1250,9 +1322,6 @@ uninstall-man: uninstall-man3 uninstall-man5
 	uninstall-pkgconfigDATA uninstall-pkgincludeHEADERS


-@HAVE_LD_VERSION_SCRIPT_TRUE@  # Versioned symbols and restricted exports
-@HAVE_LD_VERSION_SCRIPT_FALSE@  # Only restricted exports when possible
-
 $(PNGLIB_BASENAME).pc: libpng.pc
 	cp libpng.pc $@

@@ -1260,7 +1329,7 @@ $(PNGLIB_BASENAME)-config: libpng-config
 	cp libpng-config $@

 scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
-scripts/symbols.out scripts/pngwin.out: png.h pngconf.h scripts/pnglibconf.h
+scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt

 libpng.sym: scripts/sym.out
 	rm -f $@
@@ -1268,41 +1337,43 @@ libpng.sym: scripts/sym.out
 libpng.vers: scripts/vers.out
 	rm -f $@
 	cp $? $@
-pngwin.def: scripts/pngwin.out
-	rm -f $@
-	cp $? $@
 pnglibconf.h: pnglibconf.out
 	rm -f $@
 	cp $? $@
-scripts/pnglibconf.h:
+$(srcdir)/scripts/pnglibconf.h.prebuilt:
+	@echo "Attempting to build $@" >&2
 	@echo "This is a machine generated file, but if you want to make" >&2
 	@echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2
 	@exit 1

+# The following is necessary to ensure that the local pnglibconf.h is used, not
+# an installed one (this can happen immediately after on a clean system if
+# 'make test' is the first thing the user does.)
+contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h
+
 .dfn.out:
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
-	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c >dfn1.out
-	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
+	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
+	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
-	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
+	$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out
 	rm -f dfn.c dfn[12].out
 	mv dfn3.out $@

 # The .dfn file for pnglibconf.h is machine generated
-pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
+pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ dfn?.out
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=1 out=dfn1.out\
-	    ${srcdir}/scripts/pnglibconf.dfa 1>&2
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=0 out=dfn2.out\
-	    dfn1.out 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out version=search\
+	    ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
+	    $(DFA_XTRA) 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@

 # Symbol checks (.def and .out files should match)
-scripts/pngwin.chk: scripts/checksym.awk scripts/pngwin.def scripts/pngwin.out
 scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
 .out.chk:
 	rm -f $@ symbols.new
@@ -1312,14 +1383,14 @@ scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.ou

 # used on demand to regenerate the standard header, CPPFLAGS should
 # be empty - no non-standard defines
-scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
+scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ dfn?.out
-	test -z "$(CPPFLAGS)" 
+	test -z "$(CPPFLAGS)"
 	echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=1 out=dfn1.out\
-	    logunsupported=1 - ${srcdir}/scripts/pnglibconf.dfa 1>&2
-	$(AWK) -f ${srcdir}/scripts/options.awk pre=0 out=dfn2.out\
-	    logunsupported=1 dfn1.out 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out logunsupported=1
+		version=search ${srcdir}/pngconf.h -\
+		${srcdir}/scripts/pnglibconf.dfa 1>&2
+	$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
 	rm dfn1.out
 	mv dfn2.out $@

@@ -1329,7 +1400,7 @@ $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
 test: check-am

 # Extra checks
-check: scripts/symbols.chk scripts/pngwin.chk
+check: scripts/symbols.chk

 # Don't distribute the generated script files
 dist-hook:
@@ -1352,7 +1423,7 @@ install-exec-hook:
 	cd $(DESTDIR)$(bindir); $(LN_S) $(PNGLIB_BASENAME)-config libpng-config
 	@set -x;\
 	cd $(DESTDIR)$(libdir);\
-	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib; do\
+	for ext in a la so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ sl dylib dll.a; do\
 		rm -f libpng.$$ext;\
                if test -f $(PNGLIB_BASENAME).$$ext; then\
                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
--- a/19
+++ b/19
@@ -1,4 +1,4 @@
-README for libpng version 1.5.0beta18 - April 18, 2010 (shared library 15.0)
+README for libpng version 1.5.7rc03 - December 8, 2011 (shared library 15.0)
 See the note about version numbers near the top of png.h

 See INSTALL for instructions on how to install libpng.
@@ -58,7 +58,7 @@ on the PNG-implement mailing list and not on material submitted
 privately to Guy, Andreas, or Glenn.  They will forward any good
 suggestions to the list.

-For a detailed description on using libpng, read libpng.txt.  For
+For a detailed description on using libpng, read libpng-manual.txt.  For
 examples of libpng in a program, see example.c and pngtest.c.  For usage
 information and restrictions (what little they are) on libpng, see
 png.h.  For a description on using zlib (the compression library used by
@@ -114,19 +114,16 @@ given in previous versions of this document.  He and Andreas will
 read mail addressed to the png-implement list, however.

 Please do not send general questions about PNG.  Send them to
-the (png-list at ccrc.wustl.edu, subscription required, write to
-majordomo at ccrc.wustl.edu with "subscribe png-list" in your message).
-On the other hand,
-please do not send libpng questions to that address, send them to me
-or to the png-implement list.  I'll
-get them in the end anyway.  If you have a question about something
+png-mng-misc at lists.sf.net (subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
+subscribe).  If you have a question about something
 in the PNG specification that is related to using libpng, send it
 to me.  Send me any questions that start with "I was using libpng,
 and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.

 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for nine years now, and it is official and
+been discussing PNG for sixteen years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used immediately,
 it may be used later.
@@ -141,8 +138,8 @@ Files in this distribution:
      TODO          =>  Things not implemented in the current library
      Y2KINFO       =>  Statement of Y2K compliance
      example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng (includes libpng.txt)
-      libpng.txt    =>  Description of libpng and its functions
+      libpng.3      =>  manual page for libpng (includes libpng-manual.txt)
+      libpng-manual.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
--- a/5
+++ b/5
@@ -2,7 +2,6 @@
 TODO - list of things to do for libpng:

 Final bug fixes.
-Finish work on the no-floating-point version (including gamma compensation)
 Better C++ wrapper/full C++ implementation?
 Fix problem with C++ and EXTERN "C".
 cHRM transformation.
@@ -17,14 +16,12 @@ Better filter selection
   (counting huffman bits/precompression?  filter inertia?  filter costs?).
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
-Build gamma tables using fixed point (and do away with floating point entirely).
 Avoid building gamma tables whenever possible.
 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.
 Add interpolated method of handling interlacing.
-Provide for conditional compilation of 16-bit support (except for the
-  initial stripping down to 8-bits when reading a 16-bit PNG datastream).
 Switch to the simpler zlib (zlib/libpng) license if legally possible.
+Extend pngvalid.c to validate more of the libpng transformations.

 */
--- a/aclocal.m4
+++ b/aclocal.m4
--- a/arm/filter_neon.S
+++ b/arm/filter_neon.S
@@ -0,0 +1,225 @@
+
+/* filter_neon.S - NEON optimised filter functions
+ *
+ * Copyright (c) 2011 Glenn Randers-Pehrson
+ * Written by Mans Rullgard, 2011.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
+#endif
+
+#ifdef __ELF__
+#   define ELF
+#else
+#   define ELF @
+#endif
+
+        .arch armv7-a
+        .fpu  neon
+
+.macro  func    name, export=0
+    .macro endfunc
+ELF     .size   \name, . - \name
+        .endfunc
+        .purgem endfunc
+    .endm
+        .text
+    .if \export
+        .global \name
+    .endif
+ELF     .type   \name, STT_FUNC
+        .func   \name
+\name:
+.endm
+
+func    png_read_filter_row_sub4_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vadd.u8         d0,  d3,  d4
+        vadd.u8         d1,  d0,  d5
+        vadd.u8         d2,  d1,  d6
+        vadd.u8         d3,  d2,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r3,  r3,  #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_sub3_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        mov             r0,  r1
+        mov             r2,  #3
+        mov             r12, #12
+        vld1.8          {q11},    [r0], r12
+1:
+        vext.8          d5,  d22, d23, #3
+        vadd.u8         d0,  d3,  d22
+        vext.8          d6,  d22, d23, #6
+        vadd.u8         d1,  d0,  d5
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], r12
+        vst1.32         {d0[0]},  [r1,:32], r2
+        vadd.u8         d2,  d1,  d6
+        vst1.32         {d1[0]},  [r1], r2
+        vadd.u8         d3,  d2,  d7
+        vst1.32         {d2[0]},  [r1], r2
+        vst1.32         {d3[0]},  [r1], r2
+        subs            r3,  r3,  #12
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_up_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+1:
+        vld1.8          {q0}, [r1,:128]
+        vld1.8          {q1}, [r2,:128]!
+        vadd.u8         q0,  q0,  q1
+        vst1.8          {q0}, [r1,:128]!
+        subs            r3,  r3,  #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_avg4_neon, export=1
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
+        vhadd.u8        d0,  d3,  d16
+        vadd.u8         d0,  d0,  d4
+        vhadd.u8        d1,  d0,  d17
+        vadd.u8         d1,  d1,  d5
+        vhadd.u8        d2,  d1,  d18
+        vadd.u8         d2,  d2,  d6
+        vhadd.u8        d3,  d2,  d19
+        vadd.u8         d3,  d3,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r12, r12, #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_avg3_neon, export=1
+        push            {r4,lr}
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        mov             r0,  r1
+        mov             r4,  #3
+        mov             lr,  #12
+        vld1.8          {q11},    [r0], lr
+1:
+        vld1.8          {q10},    [r2], lr
+        vext.8          d5,  d22, d23, #3
+        vhadd.u8        d0,  d3,  d20
+        vext.8          d17, d20, d21, #3
+        vadd.u8         d0,  d0,  d22
+        vext.8          d6,  d22, d23, #6
+        vhadd.u8        d1,  d0,  d17
+        vext.8          d18, d20, d21, #6
+        vadd.u8         d1,  d1,  d5
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], lr
+        vst1.32         {d0[0]},  [r1,:32], r4
+        vhadd.u8        d2,  d1,  d18
+        vst1.32         {d1[0]},  [r1], r4
+        vext.8          d19, d21, d21, #1
+        vadd.u8         d2,  d2,  d6
+        vhadd.u8        d3,  d2,  d19
+        vst1.32         {d2[0]},  [r1], r4
+        vadd.u8         d3,  d3,  d7
+        vst1.32         {d3[0]},  [r1], r4
+        subs            r12, r12, #12
+        bgt             1b
+
+        pop             {r4,pc}
+endfunc
+
+.macro  paeth           rx,  ra,  rb,  rc
+        vaddl.u8        q12, \ra, \rb           @ a + b
+        vaddl.u8        q15, \rc, \rc           @ 2*c
+        vabdl.u8        q13, \rb, \rc           @ pa
+        vabdl.u8        q14, \ra, \rc           @ pb
+        vabd.u16        q15, q12, q15           @ pc
+        vcle.u16        q12, q13, q14           @ pa <= pb
+        vcle.u16        q13, q13, q15           @ pa <= pc
+        vcle.u16        q14, q14, q15           @ pb <= pc
+        vand            q12, q12, q13           @ pa <= pb && pa <= pc
+        vmovn.u16       d28, q14
+        vmovn.u16       \rx, q12
+        vbsl            d28, \rb, \rc
+        vbsl            \rx, \ra, d28
+.endm
+
+func    png_read_filter_row_paeth4_neon, export=1
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        vmov.i8         d20, #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
+        paeth           d0,  d3,  d16, d20
+        vadd.u8         d0,  d0,  d4
+        paeth           d1,  d0,  d17, d16
+        vadd.u8         d1,  d1,  d5
+        paeth           d2,  d1,  d18, d17
+        vadd.u8         d2,  d2,  d6
+        paeth           d3,  d2,  d19, d18
+        vmov            d20, d19
+        vadd.u8         d3,  d3,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r12, r12, #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_paeth3_neon, export=1
+        push            {r4,lr}
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        vmov.i8         d4,  #0
+        mov             r0,  r1
+        mov             r4,  #3
+        mov             lr,  #12
+        vld1.8          {q11},    [r0], lr
+1:
+        vld1.8          {q10},    [r2], lr
+        paeth           d0,  d3,  d20, d4
+        vext.8          d5,  d22, d23, #3
+        vadd.u8         d0,  d0,  d22
+        vext.8          d17, d20, d21, #3
+        paeth           d1,  d0,  d17, d20
+        vst1.32         {d0[0]},  [r1,:32], r4
+        vext.8          d6,  d22, d23, #6
+        vadd.u8         d1,  d1,  d5
+        vext.8          d18, d20, d21, #6
+        paeth           d2,  d1,  d18, d17
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], lr
+        vst1.32         {d1[0]},  [r1], r4
+        vadd.u8         d2,  d2,  d6
+        vext.8          d19, d21, d21, #1
+        paeth           d3,  d2,  d19, d18
+        vst1.32         {d2[0]},  [r1], r4
+        vmov            d4,  d19
+        vadd.u8         d3,  d3,  d7
+        vst1.32         {d3[0]},  [r1], r4
+        subs            r12, r12, #12
+        bgt             1b
+
+        pop             {r4,pc}
+endfunc
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,22 +4,31 @@
 #
 # WARNING: if you run this you will change the versions
 # of the tools which are used and, maybe, required!
-        touch Makefile.am configure.ac
+
+# You can define your own replacements in your environment.
+# $AUTOCONF,  $AUTOMAKE, $AUTOHEADER, $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
+
+touch Makefile.am configure.ac
 {
-	echo "running libtoolize" >&2
-	libtoolize --force --copy --automake
+   LT=${LIBTOOLIZE-libtoolize}
+   echo "running $LT" >&2
+   $LT --force --copy --automake
 } && {
-	echo "running aclocal" >&2
-	aclocal
+   AL=${ACLOCAL-aclocal}
+   echo "running $AL" >&2
+   $AL
 } && {
-	echo "running autoheader [ignore the warnings]" >&2
-	autoheader
+   AH=${AUTOHEADER-autoheader}
+   echo "running $AH [ignore the warnings]" >&2
+   $AH
 } && {
-	echo "running automake" >&2
-	automake --force-missing --foreign -a -c
+   AM=${AUTOMAKE-automake}
+   echo "running $AM" >&2
+   $AM --force-missing --foreign -a -c
 } && {
-	echo "running autoconf" >&2
-	autoconf
+   AC=${AUTOCONF-autoconf}
+   echo "running $AC" >&2
+   $AC
 } &&
-	echo "autogen complete" >&2 ||
-	echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
+   echo "autogen complete" >&2 ||
+   echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
--- a/config.guess
+++ b/config.guess
--- a/config.h.in
+++ b/config.h.in
@@ -3,6 +3,9 @@
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H

+/* Define to 1 if you have the `feenableexcept' function. */
+#undef HAVE_FEENABLEEXCEPT
+
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H

@@ -70,6 +73,12 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION

+/* Align row buffers */
+#undef PNG_ALIGNED_MEMORY_SUPPORTED
+
+/* Enable ARM NEON optimizations */
+#undef PNG_ARM_NEON
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS

@@ -82,5 +91,19 @@
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const

+/* Define to the equivalent of the C99 'restrict' keyword, or to
+   nothing if this is not supported.  Do not define if restrict is
+   supported directly.  */
+#undef restrict
+/* Work around a bug in Sun C++: it does not support _Restrict or
+   __restrict__, even though the corresponding Sun C compiler ends up with
+   "#define restrict _Restrict" or "#define restrict __restrict__" in the
+   previous line.  Perhaps some future version of Sun C++ will work with
+   restrict; if so, hopefully it defines __RESTRICT like Sun C does.  */
+#if defined __SUNPRO_CC && !defined __RESTRICT
+# define _Restrict
+# define __restrict__
+#endif
+
 /* Define to `unsigned int' if <sys/types.h> does not define. */
 #undef size_t
--- a/config.sub
+++ b/config.sub
@@ -1,10 +1,9 @@
 #! /bin/sh
 # Configuration validation subroutine script.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
-#   Free Software Foundation, Inc.
+#   2000, 2001, 2002, 2003 Free Software Foundation, Inc.

-timestamp='2009-04-17'
+timestamp='2003-07-04'

 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -22,15 +21,14 @@ timestamp='2009-04-17'
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
-# 02110-1301, USA.
-#
+# Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
 # configuration script generated by Autoconf, you may include it under
 # the same distribution terms that you use for the rest of that program.

-
 # Please send patches to <config-patches@gnu.org>.  Submit a context
 # diff and a properly formatted ChangeLog entry.
 #
@@ -72,8 +70,8 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)

-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
-2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
+Free Software Foundation, Inc.

 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -85,11 +83,11 @@ Try \`$me --help' for more information."
 while test $# -gt 0 ; do
  case $1 in
    --time-stamp | --time* | -t )
-       echo "$timestamp" ; exit ;;
+       echo "$timestamp" ; exit 0 ;;
    --version | -v )
-       echo "$version" ; exit ;;
+       echo "$version" ; exit 0 ;;
    --help | --h* | -h )
-       echo "$usage"; exit ;;
+       echo "$usage"; exit 0 ;;
    -- )     # Stop option processing
       shift; break ;;
    - )	# Use stdin as input.
@@ -101,7 +99,7 @@ while test $# -gt 0 ; do
    *local*)
       # First pass through any local machine types.
       echo $1
-       exit ;;
+       exit 0;;

    * )
       break ;;
@@ -120,10 +118,7 @@ esac
 # Here we must recognize all the valid KERNEL-OS combinations.
 maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
 case $maybe_os in
-  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
-  uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
-  kopensolaris*-gnu* | \
-  storm-chaos* | os2-emx* | rtmk-nova*)
+  nto-qnx* | linux-gnu* | kfreebsd*-gnu* | netbsd*-gnu* | storm-chaos* | os2-emx* | rtmk-nova*)
    os=-$maybe_os
    basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
    ;;
@@ -149,7 +144,7 @@ case $os in
 	-convergent* | -ncr* | -news | -32* | -3600* | -3100* | -hitachi* |\
 	-c[123]* | -convex* | -sun | -crds | -omron* | -dg | -ultra | -tti* | \
 	-harris | -dolphin | -highlevel | -gould | -cbm | -ns | -masscomp | \
-	-apple | -axis | -knuth | -cray)
+	-apple | -axis)
 		os=
 		basic_machine=$1
 		;;
@@ -174,10 +169,6 @@ case $os in
 	-hiux*)
 		os=-hiuxwe2
 		;;
-	-sco6)
-		os=-sco5v6
-		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
-		;;
 	-sco5)
 		os=-sco3.2v5
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
@@ -194,10 +185,6 @@ case $os in
 		# Don't forget version if it is 3.2v4 or newer.
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
 		;;
-	-sco5v6*)
-		# Don't forget version if it is 3.2v4 or newer.
-		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
-		;;
 	-sco*)
 		os=-sco3.2v2
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
@@ -241,57 +228,44 @@ case $basic_machine in
 	| a29k \
 	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \
 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
-	| am33_2.0 \
-	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr | avr32 \
-	| bfin \
+	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr \
 	| c4x | clipper \
 	| d10v | d30v | dlx | dsp16xx \
-	| fido | fr30 | frv \
+	| fr30 | frv \
 	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 	| i370 | i860 | i960 | ia64 \
-	| ip2k | iq2000 \
-	| lm32 \
-	| m32c | m32r | m32rle | m68000 | m68k | m88k \
-	| maxq | mb | microblaze | mcore | mep | metag \
+	| ip2k \
+	| m32r | m68000 | m68k | m88k | mcore \
 	| mips | mipsbe | mipseb | mipsel | mipsle \
 	| mips16 \
 	| mips64 | mips64el \
-	| mips64octeon | mips64octeonel \
-	| mips64orion | mips64orionel \
-	| mips64r5900 | mips64r5900el \
 	| mips64vr | mips64vrel \
+	| mips64orion | mips64orionel \
 	| mips64vr4100 | mips64vr4100el \
 	| mips64vr4300 | mips64vr4300el \
 	| mips64vr5000 | mips64vr5000el \
-	| mips64vr5900 | mips64vr5900el \
 	| mipsisa32 | mipsisa32el \
 	| mipsisa32r2 | mipsisa32r2el \
 	| mipsisa64 | mipsisa64el \
-	| mipsisa64r2 | mipsisa64r2el \
 	| mipsisa64sb1 | mipsisa64sb1el \
 	| mipsisa64sr71k | mipsisa64sr71kel \
 	| mipstx39 | mipstx39el \
 	| mn10200 | mn10300 \
-	| moxie \
-	| mt \
 	| msp430 \
-	| nios | nios2 \
 	| ns16k | ns32k \
-	| or32 \
+	| openrisc | or32 \
 	| pdp10 | pdp11 | pj | pjl \
 	| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
 	| pyramid \
-	| score \
-	| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
+	| sh | sh[1234] | sh[23]e | sh[34]eb | shbe | shle | sh[1234]le | sh3ele \
 	| sh64 | sh64le \
-	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
-	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
-	| spu | strongarm \
+	| sparc | sparc64 | sparc86x | sparclet | sparclite | sparcv9 | sparcv9b \
+	| strongarm \
 	| tahoe | thumb | tic4x | tic80 | tron \
 	| v850 | v850e \
 	| we32k \
-	| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
-	| z8k | z80)
+	| x86 | xscale | xstormy16 | xtensa \
+	| z8k)
 		basic_machine=$basic_machine-unknown
 		;;
 	m6811 | m68hc11 | m6812 | m68hc12)
@@ -301,9 +275,6 @@ case $basic_machine in
 		;;
 	m88110 | m680[12346]0 | m683?2 | m68360 | m5200 | v70 | w65 | z8k)
 		;;
-	ms1)
-		basic_machine=mt-unknown
-		;;

 	# We use `pc' rather than `unknown'
 	# because (1) that's what they normally are, and
@@ -321,69 +292,56 @@ case $basic_machine in
 	| a29k-* \
 	| alpha-* | alphaev[4-8]-* | alphaev56-* | alphaev6[78]-* \
 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
-	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* \
+	| alphapca5[67]-* | alpha64pca5[67]-* | amd64-* | arc-* \
 	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
-	| avr-* | avr32-* \
-	| bfin-* | bs2000-* \
+	| avr-* \
+	| bs2000-* \
 	| c[123]* | c30-* | [cjt]90-* | c4x-* | c54x-* | c55x-* | c6x-* \
-	| clipper-* | craynv-* | cydra-* \
+	| clipper-* | cydra-* \
 	| d10v-* | d30v-* | dlx-* \
 	| elxsi-* \
-	| f30[01]-* | f700-* | fido-* | fr30-* | frv-* | fx80-* \
+	| f30[01]-* | f700-* | fr30-* | frv-* | fx80-* \
 	| h8300-* | h8500-* \
 	| hppa-* | hppa1.[01]-* | hppa2.0-* | hppa2.0[nw]-* | hppa64-* \
 	| i*86-* | i860-* | i960-* | ia64-* \
-	| ip2k-* | iq2000-* \
-	| lm32-* \
-	| m32c-* | m32r-* | m32rle-* \
+	| ip2k-* \
+	| m32r-* \
 	| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
-	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
+	| m88110-* | m88k-* | mcore-* \
 	| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
 	| mips16-* \
 	| mips64-* | mips64el-* \
-	| mips64octeon-* | mips64octeonel-* \
-	| mips64orion-* | mips64orionel-* \
-	| mips64r5900-* | mips64r5900el-* \
 	| mips64vr-* | mips64vrel-* \
+	| mips64orion-* | mips64orionel-* \
 	| mips64vr4100-* | mips64vr4100el-* \
 	| mips64vr4300-* | mips64vr4300el-* \
 	| mips64vr5000-* | mips64vr5000el-* \
-	| mips64vr5900-* | mips64vr5900el-* \
 	| mipsisa32-* | mipsisa32el-* \
 	| mipsisa32r2-* | mipsisa32r2el-* \
 	| mipsisa64-* | mipsisa64el-* \
-	| mipsisa64r2-* | mipsisa64r2el-* \
 	| mipsisa64sb1-* | mipsisa64sb1el-* \
 	| mipsisa64sr71k-* | mipsisa64sr71kel-* \
 	| mipstx39-* | mipstx39el-* \
-	| mmix-* \
-	| mt-* \
 	| msp430-* \
-	| nios-* | nios2-* \
-	| none-* | np1-* | ns16k-* | ns32k-* \
+	| none-* | np1-* | nv1-* | ns16k-* | ns32k-* \
 	| orion-* \
 	| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
 	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* | ppcbe-* \
 	| pyramid-* \
 	| romp-* | rs6000-* \
-	| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
+	| sh-* | sh[1234]-* | sh[23]e-* | sh[34]eb-* | shbe-* \
 	| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
-	| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
-	| sparclite-* \
-	| sparcv8-* | sparcv9-* | sparcv9b-* | sparcv9v-* | strongarm-* | sv1-* | sx?-* \
+	| sparc-* | sparc64-* | sparc86x-* | sparclet-* | sparclite-* \
+	| sparcv9-* | sparcv9b-* | strongarm-* | sv1-* | sx?-* \
 	| tahoe-* | thumb-* \
-	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
+	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* \
 	| tron-* \
 	| v850-* | v850e-* | vax-* \
 	| we32k-* \
-	| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
-	| xstormy16-* | xtensa*-* \
+	| x86-* | x86_64-* | xps100-* | xscale-* | xstormy16-* \
+	| xtensa-* \
 	| ymp-* \
-	| z8k-* | z80-*)
-		;;
-	# Recognize the basic CPU types without company name, with glob match.
-	xtensa*)
-		basic_machine=$basic_machine-unknown
+	| z8k-*)
 		;;
 	# Recognize the various machine names and aliases which stand
 	# for a CPU type and a company and sometimes even an OS.
@@ -401,9 +359,6 @@ case $basic_machine in
 		basic_machine=a29k-amd
 		os=-udi
 		;;
-    	abacus)
-		basic_machine=abacus-unknown
-		;;
 	adobe68k)
 		basic_machine=m68010-adobe
 		os=-scout
@@ -421,9 +376,6 @@ case $basic_machine in
 	amd64)
 		basic_machine=x86_64-pc
 		;;
-	amd64-*)
-		basic_machine=x86_64-`echo $basic_machine | sed 's/^[^-]*-//'`
-		;;
 	amdahl)
 		basic_machine=580-amdahl
 		os=-sysv
@@ -447,10 +399,6 @@ case $basic_machine in
 		basic_machine=m68k-apollo
 		os=-bsd
 		;;
-	aros)
-		basic_machine=i386-pc
-		os=-aros
-		;;
 	aux)
 		basic_machine=m68k-apple
 		os=-aux
@@ -459,22 +407,10 @@ case $basic_machine in
 		basic_machine=ns32k-sequent
 		os=-dynix
 		;;
-	blackfin)
-		basic_machine=bfin-unknown
-		os=-linux
-		;;
-	blackfin-*)
-		basic_machine=bfin-`echo $basic_machine | sed 's/^[^-]*-//'`
-		os=-linux
-		;;
 	c90)
 		basic_machine=c90-cray
 		os=-unicos
 		;;
-        cegcc)
-		basic_machine=arm-unknown
-		os=-cegcc
-		;;
 	convex-c1)
 		basic_machine=c1-convex
 		os=-bsd
@@ -499,27 +435,12 @@ case $basic_machine in
 		basic_machine=j90-cray
 		os=-unicos
 		;;
-	craynv)
-		basic_machine=craynv-cray
-		os=-unicosmp
-		;;
-	cr16)
-		basic_machine=cr16-unknown
-		os=-elf
-		;;
 	crds | unos)
 		basic_machine=m68k-crds
 		;;
-	crisv32 | crisv32-* | etraxfs*)
-		basic_machine=crisv32-axis
-		;;
 	cris | cris-* | etrax*)
 		basic_machine=cris-axis
 		;;
-	crx)
-		basic_machine=crx-unknown
-		os=-elf
-		;;
 	da30 | da30-*)
 		basic_machine=m68k-da30
 		;;
@@ -542,14 +463,6 @@ case $basic_machine in
 		basic_machine=m88k-motorola
 		os=-sysv3
 		;;
-	dicos)
-		basic_machine=i686-pc
-		os=-dicos
-		;;
-	djgpp)
-		basic_machine=i586-pc
-		os=-msdosdjgpp
-		;;
 	dpx20 | dpx20-*)
 		basic_machine=rs6000-bull
 		os=-bosx
@@ -700,14 +613,6 @@ case $basic_machine in
 		basic_machine=m68k-isi
 		os=-sysv
 		;;
-	m68knommu)
-		basic_machine=m68k-unknown
-		os=-linux
-		;;
-	m68knommu-*)
-		basic_machine=m68k-`echo $basic_machine | sed 's/^[^-]*-//'`
-		os=-linux
-		;;
 	m88k-omron*)
 		basic_machine=m88k-omron
 		;;
@@ -723,10 +628,6 @@ case $basic_machine in
 		basic_machine=i386-pc
 		os=-mingw32
 		;;
-	mingw32ce)
-		basic_machine=arm-unknown
-		os=-mingw32ce
-		;;
 	miniframe)
 		basic_machine=m68000-convergent
 		;;
@@ -740,6 +641,10 @@ case $basic_machine in
 	mips3*)
 		basic_machine=`echo $basic_machine | sed -e 's/mips3/mips64/'`-unknown
 		;;
+	mmix*)
+		basic_machine=mmix-knuth
+		os=-mmixware
+		;;
 	monitor)
 		basic_machine=m68k-rom68k
 		os=-coff
@@ -752,9 +657,6 @@ case $basic_machine in
 		basic_machine=i386-pc
 		os=-msdos
 		;;
-	ms1-*)
-		basic_machine=`echo $basic_machine | sed -e 's/ms1-/mt-/'`
-		;;
 	mvs)
 		basic_machine=i370-ibm
 		os=-mvs
@@ -823,6 +725,10 @@ case $basic_machine in
 	np1)
 		basic_machine=np1-gould
 		;;
+	nv1)
+		basic_machine=nv1-cray
+		os=-unicosmp
+		;;
 	nsr-tandem)
 		basic_machine=nsr-tandem
 		;;
@@ -830,12 +736,9 @@ case $basic_machine in
 		basic_machine=hppa1.1-oki
 		os=-proelf
 		;;
-	openrisc | openrisc-*)
+	or32 | or32-*)
 		basic_machine=or32-unknown
-		;;
-	os400)
-		basic_machine=powerpc-ibm
-		os=-os400
+		os=-coff
 		;;
 	OSE68000 | ose68000)
 		basic_machine=m68000-ericsson
@@ -853,14 +756,6 @@ case $basic_machine in
 		basic_machine=i860-intel
 		os=-osf
 		;;
-	parisc)
-		basic_machine=hppa-unknown
-		os=-linux
-		;;
-	parisc-*)
-		basic_machine=hppa-`echo $basic_machine | sed 's/^[^-]*-//'`
-		os=-linux
-		;;
 	pbd)
 		basic_machine=sparc-tti
 		;;
@@ -870,12 +765,6 @@ case $basic_machine in
 	pc532 | pc532-*)
 		basic_machine=ns32k-pc532
 		;;
-	pc98)
-		basic_machine=i386-pc
-		;;
-	pc98-*)
-		basic_machine=i386-`echo $basic_machine | sed 's/^[^-]*-//'`
-		;;
 	pentium | p5 | k5 | k6 | nexgen | viac3)
 		basic_machine=i586-pc
 		;;
@@ -932,10 +821,6 @@ case $basic_machine in
 		basic_machine=i586-unknown
 		os=-pw32
 		;;
-	rdos)
-		basic_machine=i386-pc
-		os=-rdos
-		;;
 	rom68k)
 		basic_machine=m68k-rom68k
 		os=-coff
@@ -962,10 +847,6 @@ case $basic_machine in
 	sb1el)
 		basic_machine=mipsisa64sb1el-unknown
 		;;
-	sde)
-		basic_machine=mipsisa32-sde
-		os=-elf
-		;;
 	sei)
 		basic_machine=mips-sei
 		os=-seiux
@@ -977,9 +858,6 @@ case $basic_machine in
 		basic_machine=sh-hitachi
 		os=-hms
 		;;
-	sh5el)
-		basic_machine=sh5le-unknown
-		;;
 	sh64)
 		basic_machine=sh64-unknown
 		;;
@@ -1069,10 +947,6 @@ case $basic_machine in
 		basic_machine=tic6x-unknown
 		os=-coff
 		;;
-	tile*)
-		basic_machine=tile-unknown
-		os=-linux-gnu
-		;;
 	tx39)
 		basic_machine=mipstx39-unknown
 		;;
@@ -1086,10 +960,6 @@ case $basic_machine in
 	tower | tower-32)
 		basic_machine=m68k-ncr
 		;;
-	tpf)
-		basic_machine=s390x-ibm
-		os=-tpf
-		;;
 	udi29k)
 		basic_machine=a29k-amd
 		os=-udi
@@ -1133,10 +1003,6 @@ case $basic_machine in
 		basic_machine=hppa1.1-winbond
 		os=-proelf
 		;;
-	xbox)
-		basic_machine=i686-pc
-		os=-mingw32
-		;;
 	xps | xps100)
 		basic_machine=xps100-honeywell
 		;;
@@ -1148,10 +1014,6 @@ case $basic_machine in
 		basic_machine=z8k-unknown
 		os=-sim
 		;;
-	z80-*-coff)
-		basic_machine=z80-unknown
-		os=-sim
-		;;
 	none)
 		basic_machine=none-none
 		os=-none
@@ -1171,9 +1033,6 @@ case $basic_machine in
 	romp)
 		basic_machine=romp-ibm
 		;;
-	mmix)
-		basic_machine=mmix-knuth
-		;;
 	rs6000)
 		basic_machine=rs6000-ibm
 		;;
@@ -1190,10 +1049,13 @@ case $basic_machine in
 	we32k)
 		basic_machine=we32k-att
 		;;
-	sh[1234] | sh[24]a | sh[24]aeb | sh[34]eb | sh[1234]le | sh[23]ele)
+	sh3 | sh4 | sh[34]eb | sh[1234]le | sh[23]ele)
 		basic_machine=sh-unknown
 		;;
-	sparc | sparcv8 | sparcv9 | sparcv9b | sparcv9v)
+	sh64)
+		basic_machine=sh64-unknown
+		;;
+	sparc | sparcv9 | sparcv9b)
 		basic_machine=sparc-sun
 		;;
 	cydra)
@@ -1262,28 +1124,23 @@ case $os in
 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
-	      | -kopensolaris* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
-	      | -aos* | -aros* \
+	      | -aos* \
 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
 	      | -clix* | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
-	      | -hiux* | -386bsd* | -knetbsd* | -mirbsd* | -netbsd* \
-	      | -openbsd* | -solidbsd* \
-	      | -ekkobsd* | -kfreebsd* | -freebsd* | -riscix* | -lynxos* \
-	      | -bosx* | -nextstep* | -cxux* | -aout* | -elf* | -oabi* \
+	      | -hiux* | -386bsd* | -netbsd* | -openbsd* | -kfreebsd* | -freebsd* | -riscix* \
+	      | -lynxos* | -bosx* | -nextstep* | -cxux* | -aout* | -elf* | -oabi* \
 	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
-	      | -chorusos* | -chorusrdb* | -cegcc* \
+	      | -chorusos* | -chorusrdb* \
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
-	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
-	      | -uxpv* | -beos* | -mpeix* | -udk* \
+	      | -mingw32* | -linux-gnu* | -uxpv* | -beos* | -mpeix* | -udk* \
 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
 	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* \
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
-	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
-	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
+	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
@@ -1301,15 +1158,12 @@ case $os in
 		os=`echo $os | sed -e 's|nto|nto-qnx|'`
 		;;
 	-sim | -es1800* | -hms* | -xray | -os68k* | -none* | -v88r* \
-	      | -windows* | -osx | -abug | -netware* | -os9* | -beos* | -haiku* \
+	      | -windows* | -osx | -abug | -netware* | -os9* | -beos* \
 	      | -macos* | -mpw* | -magic* | -mmixware* | -mon960* | -lnews*)
 		;;
 	-mac*)
 		os=`echo $os | sed -e 's|mac|macos|'`
 		;;
-	-linux-dietlibc)
-		os=-linux-dietlibc
-		;;
 	-linux*)
 		os=`echo $os | sed -e 's|linux|linux-gnu|'`
 		;;
@@ -1322,9 +1176,6 @@ case $os in
 	-opened*)
 		os=-openedition
 		;;
-        -os400*)
-		os=-os400
-		;;
 	-wince*)
 		os=-wince
 		;;
@@ -1346,9 +1197,6 @@ case $os in
 	-atheos*)
 		os=-atheos
 		;;
-	-syllable*)
-		os=-syllable
-		;;
 	-386bsd)
 		os=-bsd
 		;;
@@ -1371,9 +1219,6 @@ case $os in
 	-sinix*)
 		os=-sysv4
 		;;
-        -tpf*)
-		os=-tpf
-		;;
 	-triton*)
 		os=-sysv3
 		;;
@@ -1410,12 +1255,6 @@ case $os in
 	-kaos*)
 		os=-kaos
 		;;
-	-zvmoe)
-		os=-zvmoe
-		;;
-	-dicos*)
-		os=-dicos
-		;;
 	-none)
 		;;
 	*)
@@ -1438,12 +1277,6 @@ else
 # system, and we'll never get to this point.

 case $basic_machine in
-        score-*)
-		os=-elf
-		;;
-        spu-*)
-		os=-elf
-		;;
 	*-acorn)
 		os=-riscix1.2
 		;;
@@ -1453,9 +1286,9 @@ case $basic_machine in
 	arm*-semi)
 		os=-aout
 		;;
-        c4x-* | tic4x-*)
-        	os=-coff
-		;;
+    c4x-* | tic4x-*)
+        os=-coff
+        ;;
 	# This must come before the *-dec entry.
 	pdp10-*)
 		os=-tops20
@@ -1481,9 +1314,6 @@ case $basic_machine in
 	m68*-cisco)
 		os=-aout
 		;;
-        mep-*)
-		os=-elf
-		;;
 	mips*-cisco)
 		os=-elf
 		;;
@@ -1502,15 +1332,9 @@ case $basic_machine in
 	*-be)
 		os=-beos
 		;;
-	*-haiku)
-		os=-haiku
-		;;
 	*-ibm)
 		os=-aix
 		;;
-    	*-knuth)
-		os=-mmixware
-		;;
 	*-wec)
 		os=-proelf
 		;;
@@ -1643,15 +1467,9 @@ case $basic_machine in
 			-mvs* | -opened*)
 				vendor=ibm
 				;;
-			-os400*)
-				vendor=ibm
-				;;
 			-ptx*)
 				vendor=sequent
 				;;
-			-tpf*)
-				vendor=ibm
-				;;
 			-vxsim* | -vxworks* | -windiss*)
 				vendor=wrs
 				;;
@@ -1676,7 +1494,7 @@ case $basic_machine in
 esac

 echo $basic_machine$os
-exit
+exit 0

 # Local variables:
 # eval: (add-hook 'write-file-hooks 'time-stamp)
--- a/4207
+++ b/4207
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)

 dnl Version number stuff here:

-AC_INIT([libpng], [1.5.0beta18], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.7rc03], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE

-PNGLIB_VERSION=1.5.0beta18
+PNGLIB_VERSION=1.5.7rc03
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=0
+PNGLIB_RELEASE=7

 dnl End of version number stuff

@@ -34,16 +34,39 @@ AC_CONFIG_SRCDIR([pngget.c])
 AM_CONFIG_HEADER(config.h)

 # Checks for programs.
+AC_LANG([C])
 AC_PROG_CC
+AM_PROG_AS
 AC_PROG_LD
 AC_PROG_CPP
 AC_CHECK_TOOL(SED, sed, :)
 AC_CHECK_TOOL(AWK, awk, :)
-AC_LIBTOOL_WIN32_DLL
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
-AC_PROG_LIBTOOL
+LT_INIT([win32-dll])
+
+# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# does some input parsing.  We need strict ANSI-C style tokenization,
+# check this:
+AC_REQUIRE_CPP
+AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
+AC_TRY_CPP([1.5.0 16BIT],
+   [DFNCPP="$CPP"],
+   [DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      AC_TRY_CPP([1.5.0 16BIT],
+         [DFNCPP="$CPP"]
+         [break],,)
+   done
+   CPP="$sav_CPP"])
+if test -n "$DFNCPP"; then
+   AC_MSG_RESULT([$DFNCPP])
+   AC_SUBST(DFNCPP)
+else
+   AC_MSG_FAILURE([not found], 1)
+fi

 # Checks for header files.
 AC_HEADER_STDC
@@ -53,19 +76,60 @@ AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_STRUCT_TM
+AC_C_RESTRICT

 # Checks for library functions.
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc]))
 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )
-AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))
+AC_ARG_WITH(zlib-prefix,
+   AC_HELP_STRING([--with-zlib-prefix],
+                  [prefix that may have been used in installed zlib]),
+                  [ZPREFIX=${withval}],
+                  [ZPREFIX='z_'])
+AC_CHECK_LIB(z, zlibVersion, ,
+    AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, ,
+                 AC_ERROR([zlib not installed])))
+
+# The following is for pngvalid, to ensure it catches FP errors even on
+# platforms that don't enable FP exceptions, the function appears in the math
+# library (typically), it's not an error if it is not found.
+AC_CHECK_LIB([m], [feenableexcept])
+AC_CHECK_FUNCS([feenableexcept])

 LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
 LIBPNG_DEFINES=$LIBPNG_DEFINES
 AC_SUBST(LIBPNG_DEFINES)

 AC_MSG_CHECKING([if libraries can be versioned])
-GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
+
+AC_MSG_CHECKING([if using Solaris linker])
+SLD=`$LD --version 2>&1 | grep Solaris`
+if test "$SLD"; then
+    have_solaris_ld=yes
+    AC_MSG_RESULT(yes)
+else
+    have_solaris_ld=no
+    AC_MSG_RESULT(no)
+fi
+AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
+
+# Special case for PE/COFF platforms: ld reports
+# support for version-script, but doesn't actually
+# DO anything with it.
+case $host in
+*cygwin* | *mingw32* | *interix* )
+    have_ld_version_script=no
+    AC_MSG_RESULT(no)
+;;
+* )
+
+if test "$have_solaris_ld" = "yes"; then
+    GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
+else
+    GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
+fi
+
 if test "$GLD"; then
    have_ld_version_script=yes
    AC_MSG_RESULT(yes)
@@ -74,6 +138,9 @@ else
    AC_MSG_RESULT(no)
    AC_MSG_WARN(*** You have not enabled versioned symbols.)
 fi
+;;
+esac
+
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

 if test "$have_ld_version_script" = "yes"; then
@@ -117,6 +184,19 @@ AC_ARG_WITH(binconfigs,
 	[binconfigs='${binconfigs}'])
 AC_SUBST([binconfigs])

+# Because GCC by default assembles code with an executable stack, even though it
+# compiles C code with a non-executable stack, it is necessary to do a fixup
+# here (this may by GCC specific)
+AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])
+
+AC_ARG_ENABLE([arm-neon],
+	AC_HELP_STRING([--enable-arm-neon], [Enable ARM NEON optimizations]),
+	[if test "${enableval}" = yes; then
+		AC_DEFINE([PNG_ARM_NEON], [1], [Enable ARM NEON optimizations])
+		AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [1], [Align row buffers])
+	fi])
+AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" = yes])
+
 # Config files, substituting as above
 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
 AC_CONFIG_FILES([libpng-config:libpng-config.in],
--- a/contrib/README.txt
+++ b/contrib/README.txt
@@ -0,0 +1,4 @@
+
+This "contrib" directory contains contributions which are not necessarily under
+the libpng license, although all are open source.  They are not part of
+libpng proper and are not used for building the library.
--- a/contrib/gregbook/COPYING
+++ b/contrib/gregbook/COPYING
@@ -1,12 +1,12 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

-			    Preamble
+                            Preamble

  The licenses for most software are designed to take away your
 freedom to share and change it.  By contrast, the GNU General Public
@@ -56,7 +56,7 @@ patent must be licensed for everyone's free use or not licensed at all.
  The precise terms and conditions for copying, distribution and
 modification follow.

-		    GNU GENERAL PUBLIC LICENSE
+                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
@@ -255,7 +255,7 @@ make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.

-			    NO WARRANTY
+                            NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
@@ -277,9 +277,9 @@ YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.

-		     END OF TERMS AND CONDITIONS
+                     END OF TERMS AND CONDITIONS

-	    How to Apply These Terms to Your New Programs
+            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
--- a/contrib/gregbook/Makefile.w32
+++ b/contrib/gregbook/Makefile.w32
@@ -18,7 +18,7 @@
 # "c:\windows\command.com /e:4096" as the program command line and set the
 # working directory to this directory.  Then double-click to open the new
 # DOS-prompt window with a bigger environment and retry the commands above.
-# 
+#
 # This makefile assumes libpng and zlib have already been built or downloaded
 # and are in subdirectories at the same level as the current subdirectory
 # (as indicated by the PNGPATH and ZPATH macros below).  Edit as appropriate.
--- a/contrib/gregbook/README
+++ b/contrib/gregbook/README
@@ -63,9 +63,9 @@ BUILD INSTRUCTIONS

 - Prerequisites (in order of compilation):

-      - zlib		http://zlib.net/
-      - libpng		http://www.libpng.org/pub/png/libpng.html
-      - pngbook		http://www.libpng.org/pub/png/book/sources.html
+      - zlib            http://zlib.net/
+      - libpng          http://www.libpng.org/pub/png/libpng.html
+      - pngbook         http://www.libpng.org/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,
@@ -104,7 +104,7 @@ BUILD INSTRUCTIONS
     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 /
@@ -165,19 +165,19 @@ 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
+        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
+        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-notrans.ppm > toucan-notrans.png
+        wpng -time < toucan-notrans.ppm > toucan-notrans.png

     would convert the specified PPM file (using redirection) to PNG, auto-
     matically setting the PNG modification-time chunk.
--- a/contrib/gregbook/makevms.com
+++ b/contrib/gregbook/makevms.com
@@ -20,13 +20,13 @@ $ if zpath .eqs. ""
 $ then
 $   write sys$output "zlib include not found. Exiting..."
 $   exit 2
-$ endif 
+$ endif
 $!
 $ if pngpath .eqs. ""
 $ then
 $   write sys$output "libpng include not found. Exiting..."
 $   exit 2
-$ endif 
+$ endif
 $!
 $!    Look for the compiler used.
 $!
--- a/contrib/gregbook/readpng.c
+++ b/contrib/gregbook/readpng.c
@@ -229,8 +229,14 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
        png_set_expand(png_ptr);
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
        png_set_expand(png_ptr);
+#ifdef PNG_READ_16_TO_8_SUPPORTED
    if (bit_depth == 16)
+#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+        png_set_scale_16(png_ptr);
+#  else
        png_set_strip_16(png_ptr);
+#  endif
+#endif
    if (color_type == PNG_COLOR_TYPE_GRAY ||
        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
        png_set_gray_to_rgb(png_ptr);
@@ -263,7 +269,8 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
        return NULL;
    }

-    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
+    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n",
+        *pChannels, rowbytes, height));


    /* set the individual row_pointers to point at the correct offsets */
--- a/contrib/gregbook/readpng2.c
+++ b/contrib/gregbook/readpng2.c
@@ -55,8 +55,10 @@


 #include <stdlib.h>     /* for exit() prototype */
+#include <setjmp.h>

-#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include <zlib.h>
+#include "png.h"        /* libpng header from the local directory */
 #include "readpng2.h"   /* typedefs, common macros, public prototypes */


@@ -66,6 +68,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr);
 static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
                                 png_uint_32 row_num, int pass);
 static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);



@@ -101,7 +104,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
    /* could also replace libpng warning-handler (final NULL), but no need: */

    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
-      NULL, NULL);
+      readpng2_error_handler, NULL);
    if (!png_ptr)
        return 4;   /* out of memory */

@@ -128,7 +131,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
    }


-#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    /* prepare the reader to ignore all recognized chunks whose data won't be
     * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
     * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
@@ -137,7 +140,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
         * version recognizes more chunks, add them to this list.  If a
         * future version of readpng2.c recognizes more chunks, delete them
         * from this list. */
-        static const png_byte chunks_to_ignore[] = {
+        static /* const */ png_byte chunks_to_ignore[] = {
             99,  72,  82,  77, '\0',  /* cHRM */
            104,  73,  83,  84, '\0',  /* hIST */
            105,  67,  67,  80, '\0',  /* iCCP */
@@ -157,7 +160,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
        png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,
          chunks_to_ignore, sizeof(chunks_to_ignore)/5);
    }
-#endif /* PNG_UNKNOWN_CHUNKS_SUPPORTED */
+#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */


    /* instead of doing png_init_io() here, now we set up our callback
@@ -215,7 +218,11 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
    mainprog_info  *mainprog_ptr;
    int  color_type, bit_depth;
    png_uint_32 width, height;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
    double  gamma;
+#else
+    png_fixed_point gamma;
+#endif


    /* setjmp() doesn't make sense here, because we'd either have to exit(),
@@ -304,8 +311,14 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
        png_set_expand(png_ptr);
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
        png_set_expand(png_ptr);
+#ifdef PNG_READ_16_TO_8_SUPPORTED
    if (bit_depth == 16)
+#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+        png_set_scale_16(png_ptr);
+#  else
        png_set_strip_16(png_ptr);
+#  endif
+#endif
    if (color_type == PNG_COLOR_TYPE_GRAY ||
        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
        png_set_gray_to_rgb(png_ptr);
@@ -326,11 +339,19 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
     * "gamma" value for the entire display system, i.e., the product of
     * LUT_exponent and CRT_exponent. */

+#ifdef PNG_FLOATING_POINT_SUPPORTED
    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
    else
        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
-
+#else
+    if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
+    else
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
+#endif

    /* we'll let libpng expand interlaced images, too */

@@ -450,3 +471,41 @@ void readpng2_cleanup(mainprog_info *mainprog_ptr)
    mainprog_ptr->png_ptr = NULL;
    mainprog_ptr->info_ptr = NULL;
 }
+
+
+
+
+
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "readpng2 libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
--- a/contrib/gregbook/rpng-win.c
+++ b/contrib/gregbook/rpng-win.c
@@ -24,8 +24,6 @@
    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
-    - 2.02:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

@@ -87,7 +85,33 @@
 #include <string.h>
 #include <time.h>
 #include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
 #include <conio.h>      /* only for _getch() */
+#endif

 /* #define DEBUG  :  this enables the Trace() macros */

@@ -155,7 +179,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)

    filename = (char *)NULL;

-
+#ifndef __CYGWIN__
    /* First 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
@@ -164,6 +188,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
+#endif


    /* Next set the default value for our display-system exponent, i.e.,
@@ -281,7 +306,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* print usage screen if any errors up to this point */

    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng_version_info();
@@ -295,11 +322,15 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "\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"
+#ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen.\n"
+#endif
          "\n", PROGNAME, default_display_exponent);
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(1);
    }

@@ -335,18 +366,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)


    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
+#endif
    }


@@ -419,7 +456,12 @@ 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");
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
    fflush(stdout);

    while (GetMessage(&msg, NULL, 0, 0)) {
--- a/contrib/gregbook/rpng-x.c
+++ b/contrib/gregbook/rpng-x.c
@@ -26,8 +26,6 @@
    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
    - 2.00:  dual-licensed (added GNU GPL)
    - 2.01:  fixed improper display of usage screen on PNG error(s)
-    - 2.02:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

@@ -254,8 +252,8 @@ int main(int argc, char **argv)
            else {
                bgstr = *argv;
                if (strlen(bgstr) != 7 || bgstr[0] != '#')
-                    ++error; 
-                else 
+                    ++error;
+                else
                    have_bg = TRUE;
            }
        } else {
--- a/contrib/gregbook/rpng2-win.c
+++ b/contrib/gregbook/rpng2-win.c
@@ -32,9 +32,7 @@
    - 2.01:  fixed 64-bit typo in readpng2.c
    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
              unexpected-EOF and file-read-error cases
-    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options;
-             removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.
+    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options

  ---------------------------------------------------------------------------

@@ -98,7 +96,33 @@
 #include <time.h>
 #include <math.h>      /* only for PvdM background code */
 #include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
 #include <conio.h>     /* only for _getch() */
+#endif

 /* all for PvdM background code: */
 #ifndef PI
@@ -272,7 +296,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    filename = (char *)NULL;
    memset(&rpng2_info, 0, sizeof(mainprog_info));

-
+#ifndef __CYGWIN__
    /* 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
@@ -281,7 +305,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    AllocConsole();
    freopen("CONOUT$", "a", stderr);
    freopen("CONOUT$", "a", stdout);
-
+#endif

    /* Set the default value for our display-system exponent, i.e., the
     * product of the CRT exponent and the exponent corresponding to
@@ -415,7 +439,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
    /* print usage screen if any errors up to this point */

    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
        readpng2_version_info();
@@ -434,16 +460,23 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
          "    -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"
+#ifndef __CYGWIN__
          "Press Q or Esc to quit this usage screen. ",
+#else
+          ,
+#endif
          PROGNAME,
-#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
+    !(defined(__CYGWIN__) || defined(__MINGW32__))
          (int)strlen(PROGNAME), " ",
 #endif
          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
        fflush(stderr);
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(1);
    }

@@ -480,18 +513,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)


    if (error) {
+#ifndef __CYGWIN__
        int ch;
+#endif

        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
        do
            ch = _getch();
        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
        exit(2);
    } else {
        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
        fprintf(stderr,
          "\n   [console window:  closing this window will terminate %s]\n\n",
          PROGNAME);
+#endif
        fflush(stderr);
    }

@@ -551,7 +590,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
                  "(unexpectedly) while reading PNG image file\n");
                exit(3);
            } else /* if (error) */ {
-                // will print error message below
+                /* will print error message below */
            }
            break;
        }
@@ -1134,7 +1173,12 @@ static void rpng2_win_finish_display()

    rpng2_info.state = kDone;
    printf(
-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
    fflush(stdout);
 }

--- a/contrib/gregbook/rpng2-x.c
+++ b/contrib/gregbook/rpng2-x.c
@@ -41,8 +41,6 @@
              unexpected-EOF and file-read-error cases; fixed Trace() cut-and-
              paste bugs
    - 2.03:  deleted runtime MMX-enabling/disabling and obsolete -mmx* options
-             removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

  ---------------------------------------------------------------------------

@@ -487,9 +485,6 @@ int main(int argc, char **argv)
          "\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) || defined(__x86_64__))
-          (int)strlen(PROGNAME), " ",
-#endif
          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat-1);
        exit(1);
    }
@@ -596,7 +591,7 @@ int main(int argc, char **argv)
                  "(unexpectedly) while reading PNG image file\n");
                exit(3);
            } else /* if (error) */ {
-                // will print error message below
+                /* will print error message below */
            }
            break;
        }
@@ -786,8 +781,9 @@ static void rpng2_x_init(void)
    if (rpng2_x_create_window()) {

        /* GRR TEMPORARY HACK:  this is fundamentally no different from cases
-         * above; libpng should longjmp() back to us when png_ptr goes away.
-         * If we/it segfault instead, seems like a libpng bug... */
+         * above; libpng should call our error handler to longjmp() back to us
+         * when png_ptr goes away.  If we/it segfault instead, seems like a
+         * libpng bug... */

        /* we're here via libpng callback, so if window fails, clean and bail */
        readpng2_cleanup(&rpng2_info);
--- a/contrib/gregbook/wpng.c
+++ b/contrib/gregbook/wpng.c
@@ -29,8 +29,6 @@
    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix
              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
    - 2.00:  dual-licensed (added GNU GPL)
-    - 2.01:  removed special error-handling which is no longer needed
-             because of the new libpng png_longjmp() feature in libpng-1.5.0.

        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line
         dose not work!  In order to do something useful I needed to redirect
--- a/contrib/gregbook/writepng.c
+++ b/contrib/gregbook/writepng.c
@@ -60,6 +60,10 @@
 #include "writepng.h"   /* typedefs, common macros, public prototypes */


+/* local prototype */
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
+


 void writepng_version_info(void)
@@ -86,7 +90,7 @@ int writepng_init(mainprog_info *mainprog_ptr)
    /* could also replace libpng warning-handler (final NULL), but no need: */

    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
-      NULL, NULL);
+      writepng_error_handler, NULL);
    if (!png_ptr)
        return 4;   /* out of memory */

@@ -100,7 +104,8 @@ int writepng_init(mainprog_info *mainprog_ptr)
    /* setjmp() must be called in every function that calls a PNG-writing
     * libpng function, unless an alternate error handler was installed--
     * but compatible error handlers must either use longjmp() themselves
-     * (as in this program) or exit immediately, so here we go: */
+     * (as in this program) or some other method to return control to
+     * application code, so here we go: */

    if (setjmp(mainprog_ptr->jmpbuf)) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
@@ -355,3 +360,41 @@ void writepng_cleanup(mainprog_info *mainprog_ptr)
    if (png_ptr && info_ptr)
        png_destroy_write_struct(&png_ptr, &info_ptr);
 }
+
+
+
+
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "writepng libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "writepng severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
--- a/contrib/pngminim/README
+++ b/contrib/pngminim/README
@@ -0,0 +1,4 @@
+This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
+to build minimal decoder, encoder, and progressive reader applications.
+
+See the individual README and pngusr.dfa files for more explanation.
--- a/contrib/pngminim/decoder/README
+++ b/contrib/pngminim/decoder/README
@@ -1,9 +1,10 @@
-This demonstrates the use of PNG_USER_CONFIG and pngusr.h
+This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa

-To build a minimal read-only decoder with embedded libpng and zlib, run
+The makefile builds a minimal read-only decoder with embedded libpng
+and zlib.

-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.

 If you prefer to use the shared libraries, go to contrib/pngminus
-and build the png2pnm application there. 
+and build the png2pnm application there.
--- a/contrib/pngminim/decoder/gather.sh
+++ b/contrib/pngminim/decoder/gather.sh
@@ -1,15 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp ${PNGSRC}/contrib/pngminus/png2pnm.c pngm2pnm.c
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngpread.c pngw*.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm minigzip.c example.c compress.c deflate.c gz*
--- a/contrib/pngminim/decoder/makefile
+++ b/contrib/pngminim/decoder/makefile
@@ -5,23 +5,77 @@
 CC=gcc
 LD=$(CC)

-RM=rm -f
+# If awk fails try
+# make AWK=nawk

-CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP \
-       -DdeflateParams\(a,b,c\)=Z_OK -I. -O1
+# If cpp fails try
+# make CPP=/lib/cpp
+
+RM=rm -f
+COPY=cp
+
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. -O1

 C=.c
 O=.o
 L=.a
 E=

-ZOBJS  = adler32$(O) crc32$(O) \
-	 infback$(O) inffast$(O) inflate$(O) inftrees$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/pngminus

-OBJS  = pngm2pnm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# Zlib (minimal inflate requirements - crc32 is used by libpng)
+# zutil can be eliminated if you provide your own zcalloc and zcfree
+ZSRCS  = adler32$(C) crc32$(C) \
+	 inffast$(C) inflate$(C) inftrees$(C) \
+	 zutil$(C)
+
+# Standard headers
+ZH     = zlib.h crc32.h inffast.h inffixed.h \
+	 inflate.h inftrees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+ZOBJS  = adler32$(O) crc32$(O) \
+	 inffast$(O) inflate$(O) inftrees$(O) \
+	 zutil$(O)
+
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
+	pngset$(C) pngtrans$(C)
+	
+# Standard headers
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
-	pngset$(O) pngtrans$(O)  $(ZOBJS)
+	pngset$(O) pngtrans$(O)
+
+PROGSRCS= pngm2pnm$(C)
+PROGHDRS=
+PROGDOCS=
+PROGOBJS= pngm2pnm$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)

 # implicit make rules -------------------------------------------------------

@@ -35,23 +89,62 @@ all: pngm2pnm$(E)

 pngm2pnm$(E): $(OBJS)
 	$(LD) -o pngm2pnm$(E) $(OBJS)
-	strip pngm2pnm$(E)

-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa \
-	scripts/options.awk pngusr.h
-
-	rm -f pnglibconf.h
-
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak\
-	 CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@

 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) pngm2pnm$(O)
 	$(RM) pngm2pnm$(E)
 	$(RM) $(OBJS)

-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h\
-	 pnginfo.h pngdebug.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+pngm2pnm.c: $(PROGSRC)/png2pnm.c
+	$(RM) $@
+	$(COPY) $(PROGSRC)/png2pnm.c $@

 # End of makefile for pngm2pnm
--- a/contrib/pngminim/decoder/pngusr.dfa
+++ b/contrib/pngminim/decoder/pngusr.dfa
@@ -0,0 +1,39 @@
+# pngminim/decoder/pngusr.dfa
+#
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+
+everything = off
+
+# All that is required is some read code. This example switches
+# on the sequential read code (see ../preader for a progressive
+# read example).
+
+option SEQUENTIAL_READ on
+
+# You must choose fixed or floating point arithmetic:
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+# option FLOATING_ARITHMETIC on
+
+option FLOATING_ARITHMETIC off
+
+# Your program will probably need other options.  The example
+# program here, pngm2pnm, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+
+option SETJMP on
+option STDIO on
+option READ_EXPAND on
+option READ_STRIP_16_TO_8 on
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -1,6 +1,6 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
- * Copyright (c) 2007, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,64 +12,13 @@
 #ifndef MINRDPNGCONF_H
 #define MINRDPNGCONF_H

-#ifdef NJET
-  /* No 16-bit support beyond reading with strip_16 */
-#endif
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */

-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */

 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-
-#define PNG_NO_READ_GAMMA
-#define PNG_NO_READ_BACKGROUND
-#define PNG_NO_READ_QUANTIZE
-#define PNG_NO_READ_INVERT
-#define PNG_NO_READ_SHIFT
-#define PNG_NO_READ_PACK
-#define PNG_NO_READ_PACKSWAP
-#define PNG_NO_READ_FILLER
-#define PNG_NO_READ_SWAP
-#define PNG_NO_READ_SWAP_ALPHA
-#define PNG_NO_READ_INVERT_ALPHA
-#define PNG_NO_READ_RGB_TO_GRAY
-#define PNG_NO_READ_USER_TRANSFORM
-#define PNG_NO_READ_bKGD
-#define PNG_NO_READ_cHRM
-#define PNG_NO_READ_gAMA
-#define PNG_NO_READ_hIST
-#define PNG_NO_READ_iCCP
-#define PNG_NO_READ_pCAL
-#define PNG_NO_READ_pHYs
-#define PNG_NO_READ_sBIT
-#define PNG_NO_READ_sCAL
-#define PNG_NO_READ_sPLT
-#define PNG_NO_READ_sRGB
-#define PNG_NO_READ_TEXT
-#define PNG_NO_READ_tIME
-#define PNG_NO_READ_UNKNOWN_CHUNKS
-#define PNG_NO_READ_USER_CHUNKS
-#define PNG_NO_READ_EMPTY_PLTE
-#define PNG_NO_READ_OPT_PLTE
-#define PNG_NO_READ_STRIP_ALPHA
-#define PNG_NO_READ_oFFs
-
-#define PNG_NO_WRITE_SUPPORTED
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_PROGRESSIVE_READ
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_CONVERT_TIME_RFC1123
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINRDPNGCONF_H */
--- a/contrib/pngminim/encoder/README
+++ b/contrib/pngminim/encoder/README
@@ -1,9 +1,10 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h

-To build a minimal write-only decoder with embedded libpng and zlib, run
+The makefile builds a minimal write-only decoder with embedded libpng
+and zlib.
+
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.

-    gather.sh  # to collect needed files from pngminus, libpng, and zlib
-    make
- 
 If you prefer to use the shared libraries, go to contrib/pngminus
-and build the pnm2png application there. 
+and build the pnm2png application there.
--- a/contrib/pngminim/encoder/dummy_inflate.c
+++ b/contrib/pngminim/encoder/dummy_inflate.c
@@ -1,27 +0,0 @@
-#include "zlib.h"
-
-int ZEXPORT inflate(strm, flush)
-z_streamp strm;
-int flush;
-{ return Z_OK ; }
-
-int ZEXPORT inflateReset(strm)
-z_streamp strm;
-{ return Z_OK ; }
-
-int ZEXPORT inflateEnd(strm)
-z_streamp strm;
-{ return Z_STREAM_ERROR ; }
-
-int ZEXPORT inflateInit_(strm, version, stream_size)
-z_streamp strm;
-const char *version;
-int stream_size;
-{ return Z_OK ; }
-
-int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
-z_streamp strm;
-int windowBits;
-const char *version;
-int stream_size;
-{ return Z_STREAM_ERROR ; }
--- a/contrib/pngminim/encoder/gather.sh
+++ b/contrib/pngminim/encoder/gather.sh
@@ -1,17 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp ${PNGSRC}/contrib/pngminus/pnm2png.c pnm2pngm.c
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngr*.c pngpread.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm inf*.[ch]
-rm minigzip.c example.c gz*
-
--- a/contrib/pngminim/encoder/makefile
+++ b/contrib/pngminim/encoder/makefile
@@ -5,7 +5,14 @@
 CC=gcc
 LD=$(CC)

+# If awk fails try
+# make AWK=nawk
+
+# If cpp fails try
+# make CPP=/lib/cpp
+
 RM=rm -f
+COPY=cp

 CFLAGS=-DPNG_USER_CONFIG -DNO_GZIP -I. -O1

@@ -14,13 +21,61 @@ O=.o
 L=.a
 E=

-ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
-	 dummy_inflate$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/pngminus

-OBJS  = pnm2pngm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# Zlib
+ZSRCS  = adler32$(C) compress$(C) crc32$(C) deflate$(C) \
+	 trees$(C) zutil$(C)
+
+# Standard headers
+#ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
+ZH     = zlib.h crc32.h deflate.h trees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+# compress is not required; it is needed to link the zlib
+# code because deflate defines an unused API function deflateBound
+# which itself calls compressBound from compress.
+ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
+	 trees$(O) zutil$(O)
+
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \
+	pngwtran$(C) pngwutil$(C)
+
+# Standard headers
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
-	pngwtran$(O) pngwutil$(O) $(ZOBJS)
+	pngwtran$(O) pngwutil$(O)
+
+PROGSRCS= pnm2pngm$(C)
+PROGHDRS=
+PROGDOCS=
+PROGOBJS= pnm2pngm$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)

 # implicit make rules -------------------------------------------------------

@@ -33,18 +88,62 @@ all: pnm2pngm$(E)

 pnm2pngm$(E): $(OBJS)
 	$(LD) -o pnm2pngm$(E) $(OBJS)
-	strip pnm2pngm$(E)

-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa scripts/options.awk pngusr.h
-	rm -f pnglibconf.h
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@

 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) pnm2pngm$(O)
 	$(RM) pnm2pngm$(E)
 	$(RM) $(OBJS)

-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h  pngusr.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+pnm2pngm.c: $(PROGSRC)/pnm2png.c
+	$(RM) $@
+	$(COPY) $(PROGSRC)/pnm2png.c $@

 # End of makefile for pnm2pngm
--- a/contrib/pngminim/encoder/pngusr.dfa
+++ b/contrib/pngminim/encoder/pngusr.dfa
@@ -0,0 +1,35 @@
+# pngminim/encoder/pngusr.dfa
+#
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+
+everything = off
+
+# Switch on the write code - this makes a minimalist encoder
+
+option WRITE on
+
+# You must choose fixed or floating point arithmetic:
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+# option FLOATING_ARITHMETIC on
+
+option FLOATING_ARITHMETIC off
+
+# Your program will probably need other options.  The example
+# program here, pnm2pngm, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+
+option SETJMP on
+option STDIO on
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -1,6 +1,6 @@
 /* minwrpngconf.h: headers to make a minimal png-write-only library
 *
- * Copyright (c) 2007, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2007, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,62 +12,13 @@
 #ifndef MINWRPNGCONF_H
 #define MINWRPNGCONF_H

-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */

-#define PNG_NO_READ_SUPPORTED
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */

 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-
-#define PNG_NO_WRITE_BACKGROUND
-#define PNG_NO_WRITE_GAMMA
-#define PNG_NO_WRITE_QUANTIZE
-#define PNG_NO_WRITE_INVERT
-#define PNG_NO_WRITE_SHIFT
-#define PNG_NO_WRITE_PACK
-#define PNG_NO_WRITE_PACKSWAP
-#define PNG_NO_WRITE_FILLER
-#define PNG_NO_WRITE_SWAP
-#define PNG_NO_WRITE_SWAP_ALPHA
-#define PNG_NO_WRITE_INVERT_ALPHA
-#define PNG_NO_WRITE_RGB_TO_GRAY
-#define PNG_NO_WRITE_USER_TRANSFORM
-#define PNG_NO_WRITE_bKGD
-#define PNG_NO_WRITE_cHRM
-#define PNG_NO_WRITE_gAMA
-#define PNG_NO_WRITE_hIST
-#define PNG_NO_WRITE_iCCP
-#define PNG_NO_WRITE_oFFs
-#define PNG_NO_WRITE_pCAL
-#define PNG_NO_WRITE_pHYs
-#define PNG_NO_WRITE_sBIT
-#define PNG_NO_WRITE_sCAL
-#define PNG_NO_WRITE_sPLT
-#define PNG_NO_WRITE_sRGB
-#define PNG_NO_WRITE_TEXT
-#define PNG_NO_WRITE_tIME
-#define PNG_NO_WRITE_UNKNOWN_CHUNKS
-#define PNG_NO_WRITE_USER_CHUNKS
-#define PNG_NO_WRITE_EMPTY_PLTE
-#define PNG_NO_WRITE_OPT_PLTE
-#define PNG_NO_WRITE_FILTER
-#define PNG_NO_WRITE_WEIGHTED_FILTER
-#define PNG_NO_WRITE_INTERLACING_SUPPORTED
-#define PNG_NO_WRITE_FLUSH
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_CONVERT_TIME_RFC1123
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINWRPNGCONF_H */
--- a/contrib/pngminim/preader/README
+++ b/contrib/pngminim/preader/README
@@ -1,14 +1,15 @@
 This demonstrates the use of PNG_USER_CONFIG and pngusr.h

-To build a minimal read-only progressive decoder embedded libpng and
-zlib and with your system's X library, run
+The makefile builds a minimal read-only progressive decoder with
+embedded libpng, zlib and your system's X library.

-    gather.sh # to collect needed files from gregbook, libpng, and zlib
+Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
+on the make command line.

 Edit makefile if required, to find your X library and include files,
 then
-    
-    make
- 
+
+    make ZLIBSRC=directory
+
 If you prefer to use the shared libraries, go to contrib/gregbook
-and build the rpng2-x application there. 
+and build the rpng2-x application there.
--- a/contrib/pngminim/preader/gather.sh
+++ b/contrib/pngminim/preader/gather.sh
@@ -1,18 +0,0 @@
-test -n "${PNGSRC}" || PNGSRC=../../..
-cp "${PNGSRC}"/contrib/gregbook/rpng2-x.c .
-cp "${PNGSRC}"/contrib/gregbook/readpng2.[ch] .
-cp "${PNGSRC}"/contrib/gregbook/COPYING .
-cp "${PNGSRC}"/contrib/gregbook/LICENSE .
-cp "${PNGSRC}"/*.h .
-cp "${PNGSRC}"/*.c .
-rm example.c pngtest.c pngw*.c
-rm -f pnglibconf.h
-test -d scripts || mkdir scripts
-cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
-cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
-cp "${PNGSRC}"/scripts/options.awk scripts
-# change the following if zlib is somewhere else
-test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
-cp "${ZLIBSRC}"/*.h .
-cp "${ZLIBSRC}"/*.c .
-rm minigzip.c example.c compress.c deflate.c gz*
--- a/contrib/pngminim/preader/makefile
+++ b/contrib/pngminim/preader/makefile
@@ -5,7 +5,14 @@
 CC=gcc
 LD=$(CC)

+# If awk fails try
+# make AWK=nawk
+
+# If cpp fails try
+# make CPP=/lib/cpp
+
 RM=rm -f
+COPY=cp

 #XINC = -I/usr/include			# old-style, stock X distributions
 #XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
@@ -23,21 +30,68 @@ XLIB = -L/usr/X11R6/lib -lX11
 #LIBS = $(XLIB)
 LIBS = $(XLIB) -lm                      #platforms that need libm

-CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP \
-       -DdeflateParams\(a,b,c\)=Z_OK -I. $(XINC) -O1
+CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. $(XINC) -O1

 C=.c
 O=.o
 L=.a
 E=

-ZOBJS  = adler32$(O) crc32$(O) \
-	 infback$(O) inffast$(O) inflate$(O) inftrees$(O) \
-	 trees$(O) uncompr$(O) zutil$(O)
+# Where to find the source code:
+PNGSRC =../../..
+ZLIBSRC=$(PNGSRC)/../zlib
+PROGSRC=$(PNGSRC)/contrib/gregbook

-OBJS  = rpng2-x$(O) readpng2$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
+# Zlib (minimal inflate requirements - crc32 is used by libpng)
+# zutil can be eliminated if you provide your own zcalloc and zcfree
+ZSRCS  = adler32$(C) crc32$(C) \
+	 inffast$(C) inflate$(C) inftrees$(C) \
+	 zutil$(C)
+
+# Standard headers
+ZH     = zlib.h crc32.h inffast.h inffixed.h \
+	 inflate.h inftrees.h zutil.h
+
+# Machine generated headers
+ZCONF  = zconf.h
+
+# Headers callers use
+ZINC   = zlib.h $(ZCONF)
+
+# Headers the Zlib source uses
+ZHDRS  = $(ZH) $(ZCONF)
+
+ZOBJS  = adler32$(O) crc32$(O) \
+	 inffast$(O) inflate$(O) inftrees$(O) \
+	 zutil$(O)
+
+# libpng
+PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
+	pngpread$(C) pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
+	pngset$(C) pngtrans$(C)
+
+# Standard headers
+PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
+
+# Machine generated headers
+PNGCONF=pnglibconf.h
+
+# Headers callers use
+PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
+
+# Headers the PNG library uses
+PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
+
+PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
 	pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
-	pngset$(O) pngtrans$(O)  $(ZOBJS)
+	pngset$(O) pngtrans$(O)
+
+PROGSRCS= rpng2-x$(C) readpng2$(C)
+PROGHDRS= readpng2.h
+PROGDOCS= COPYING LICENSE
+PROGOBJS= rpng2-x$(O) readpng2$(O)
+
+OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)

 # implicit make rules -------------------------------------------------------

@@ -46,22 +100,66 @@ OBJS  = rpng2-x$(O) readpng2$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \

 # dependencies

-all: rpng2-x$(E)
+all: $(PROGDOCS) rpng2-x$(E)

 rpng2-x$(E): $(OBJS)
 	$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
-	strip rpng2-x$(E)

-pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa scripts/options.awk pngusr.h
-	rm -f pnglibconf.h
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak CPPFLAGS=-DPNG_USER_CONFIG $@
+# The DFA_XTRA setting turns all libpng options off then
+# turns on those required for this minimal build.
+# The CPP_FLAGS setting causes pngusr.h to be included in
+# both the build of pnglibconf.h and, subsequently, when
+# building libpng itself.
+$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
+	$(PNGSRC)/scripts/pnglibconf.dfa \
+	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
+	$(RM) pnglibconf.h pnglibconf.dfn
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
+	    DFA_XTRA="pngusr.dfa" $@

 clean:
-	$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
+	$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
+	    srcdir=$(PNGSRC) clean
 	$(RM) rpng2-x$(O)
 	$(RM) rpng2-x$(E)
 	$(RM) $(OBJS)

-$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h  readpng2.h pngusr.h zlib.h
+# distclean also removes the copied source and headers
+distclean: clean
+	$(RM) -r scripts # historical reasons
+	$(RM) $(PNGSRCS) $(PNGH)
+	$(RM) $(ZSRCS) $(ZH) $(ZCONF)
+	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
+
+# Header file dependencies:
+$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
+$(PNGOBJS): $(PNGHDRS) $(ZINC)
+$(ZOBJS): $(ZHDRS)
+
+# Gather the source code from the respective directories
+$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PNGSRC)/$@ $@
+
+# No dependency on the ZLIBSRC target so that it only needs
+# to be specified once.
+$(ZSRCS) $(ZH):
+	$(RM) $@
+	$(COPY) $(ZLIBSRC)/$@ $@
+
+# The unconfigured zconf.h varies in name according to the
+# zlib release
+$(ZCONF):
+	$(RM) $@
+	@for f in zconf.h.in zconf.in.h zconf.h; do\
+	    test -r $(ZLIBSRC)/$$f &&\
+	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
+	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
+	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
+
+$(PROGSRCS) $(PROGHDRS) $(PROGDOCS): $(PROGSRC)/$@
+	$(RM) $@
+	$(COPY) $(PROGSRC)/$@ $@

 # End of makefile for rpng2-x
--- a/contrib/pngminim/preader/pngusr.dfa
+++ b/contrib/pngminim/preader/pngusr.dfa
@@ -0,0 +1,40 @@
+# pngminim/preader/pngusr.dfa
+#
+# Copyright (c) 2010-2011 Glenn Randers-Pehrson
+#
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# First all the build options off:
+
+everything = off
+
+# Just switch on the progressive read code
+
+option PROGRESSIVE_READ on
+
+# You may choose fixed or floating point APIs:
+# option FLOATING_POINT on
+
+option FIXED_POINT on
+
+# You must chose the internal fixed point implementation or to
+# use the system floating point.  The latter is considerably
+# smaller (by about 1kbyte on an x86 system):
+
+option FLOATING_ARITHMETIC on
+# option FLOATING_ARITHMETIC off
+
+# Your program will probably need other options.  The example
+# program here, rpng2-x, requires the following.  Take a look
+# at pnglibconf.h to find out the full set of what has to be
+# enabled to make the following work.
+
+option SETJMP on
+option STDIO on
+option READ_bKGD on
+option READ_GAMMA on
+option READ_EXPAND on
+option READ_STRIP_16_TO_8 on
+option READ_GRAY_TO_RGB on
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -1,6 +1,6 @@
 /* minrdpngconf.h: headers to make a minimal png-read-only library
 *
- * Copyright (c) 2009, 2010 Glenn Randers-Pehrson
+ * Copyright (c) 2009, 2010-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -12,54 +12,13 @@
 #ifndef MINPRDPNGCONF_H
 #define MINPRDPNGCONF_H

-#define PNG_USER_PRIVATEBUILD "PNG minimal build"
-#define PNG_USER_DLLFNAME_POSTFIX "MN"
+/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
+
+/* List options to turn off features of the build that do not
+ * affect the API (so are not recorded in pnglibconf.h)
+ */

 #define PNG_NO_WARNINGS
-#define PNG_NO_ERROR_TEXT
-
-#define PNG_NO_READ_QUANTIZE
-#define PNG_NO_READ_INVERT
-#define PNG_NO_READ_SHIFT
-#define PNG_NO_READ_PACK
-#define PNG_NO_READ_PACKSWAP
-#define PNG_NO_READ_FILLER
-#define PNG_NO_READ_SWAP
-#define PNG_NO_READ_SWAP_ALPHA
-#define PNG_NO_READ_INVERT_ALPHA
-#define PNG_NO_READ_RGB_TO_GRAY
-#define PNG_NO_READ_USER_TRANSFORM
-#define PNG_NO_READ_cHRM
-#define PNG_NO_READ_hIST
-#define PNG_NO_READ_iCCP
-#define PNG_NO_READ_pCAL
-#define PNG_NO_READ_pHYs
-#define PNG_NO_READ_sBIT
-#define PNG_NO_READ_sCAL
-#define PNG_NO_READ_sPLT
-#define PNG_NO_READ_TEXT
-#define PNG_NO_READ_tIME
-#define PNG_NO_READ_UNKNOWN_CHUNKS
-#define PNG_NO_READ_USER_CHUNKS
-#define PNG_NO_READ_EMPTY_PLTE
-#define PNG_NO_READ_OPT_PLTE
-#define PNG_NO_READ_STRIP_ALPHA
-#define PNG_NO_READ_oFFs
-
-#define PNG_NO_WRITE_SUPPORTED
-
-#define PNG_NO_INFO_IMAGE
-#define PNG_NO_USER_MEM
-#define PNG_NO_FIXED_POINT_SUPPORTED
-#define PNG_NO_MNG_FEATURES
-#define PNG_NO_USER_TRANSFORM_PTR
-#define PNG_NO_HANDLE_AS_UNKNOWN
-#define PNG_NO_CONSOLE_IO
-#define PNG_NO_ZALLOC_ZERO
-#define PNG_NO_ERROR_NUMBERS
-#define PNG_NO_EASY_ACCESS
-#define PNG_NO_USER_LIMITS
-#define PNG_NO_SET_USER_LIMITS
-#define PNG_NO_CONVERT_TIME_RFC1123
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINPRDPNGCONF_H */
--- a/contrib/pngminus/makefile.std
+++ b/contrib/pngminus/makefile.std
@@ -8,9 +8,9 @@ LD=$(CC)
 RM=rm -f

 #PNGPATH = /usr/local
-#PNGINC = -I$(PNGPATH)/include/libpng12
-#PNGLIB = -L$(PNGPATH)/lib -lpng12
-#PNGLIBS = $(PNGPATH)/lib/libpng12.a
+#PNGINC = -I$(PNGPATH)/include/libpng15
+#PNGLIB = -L$(PNGPATH)/lib -lpng15
+#PNGLIBS = $(PNGPATH)/lib/libpng15.a
 PNGINC = -I../..
 PNGLIB = -L../.. -lpng
 PNGLIBS = ../../libpng.a
@@ -23,9 +23,9 @@ ZINC = -I../../../zlib
 ZLIB = -L../../../zlib -lz
 ZLIBS = ../../../zlib/libz.a

-CFLAGS=-O3 $(PNGINC) $(ZINC)
-LDFLAGS=$(PNGLIB) $(ZLIB)
-LDFLAGSS=$(PNGLIBS) $(ZLIBS)
+CFLAGS=$(PNGINC) $(ZINC)
+LDLIBS=$(PNGLIB) $(ZLIB)
+LDLIBSS=$(PNGLIBS) $(ZLIBS)
 C=.c
 O=.o
 L=.a
@@ -40,19 +40,19 @@ png2pnm$(O): png2pnm$(C)
 	$(CC) -c $(CFLAGS) png2pnm$(C)

 png2pnm$(E): png2pnm$(O)
-	$(LD) -o png2pnm$(E) png2pnm$(O) $(LDFLAGS) -lm
+	$(LD) $(LDFLAGS) -o png2pnm$(E) png2pnm$(O) $(LDLIBS) -lm

 png2pnm-static$(E): png2pnm$(O)
-	$(LD) -o png2pnm-static$(E) png2pnm$(O) $(LDFLAGSS) -lm
+	$(LD) $(LDFLAGS) -o png2pnm-static$(E) png2pnm$(O) $(LDLIBSS) -lm

 pnm2png$(O): pnm2png$(C)
 	$(CC) -c $(CFLAGS) pnm2png$(C)

 pnm2png$(E): pnm2png$(O)
-	$(LD) -o pnm2png$(E) pnm2png$(O) $(LDFLAGS) -lm
+	$(LD) $(LDFLAGS) -o pnm2png$(E) pnm2png$(O) $(LDLIBS) -lm

 pnm2png-static$(E): pnm2png$(O)
-	$(LD) -o pnm2png-static$(E) pnm2png$(O) $(LDFLAGSS) -lm
+	$(LD) $(LDFLAGS) -o pnm2png-static$(E) pnm2png$(O) $(LDLIBSS) -lm

 clean:
 	$(RM) png2pnm$(O)
--- a/contrib/pngminus/png2pnm.c
+++ b/contrib/pngminus/png2pnm.c
@@ -144,7 +144,7 @@ int main(int argc, char *argv[])
  if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE)
  {
    fprintf (stderr, "PNG2PNM\n");
-    fprintf (stderr, "Error:  unsuccessful convertion of PNG-image\n");
+    fprintf (stderr, "Error:  unsuccessful conversion of PNG-image\n");
    exit(1);
  }

@@ -403,7 +403,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
            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++);
        }
--- a/contrib/pngsuite/README
+++ b/contrib/pngsuite/README
@@ -1,41 +1,58 @@

 pngsuite
 --------
-(c) Willem van Schaik, 1999
+(c) Willem van Schaik, 1999, 2011

-Permission to use, copy, and distribute these images for any purpose and
-without fee is hereby granted.
+Permission to use, copy, modify, and distribute these images for any
+purpose and without fee is hereby granted.

-These 15 images are part of the much larger PngSuite test-set of 
-images, available for developers of PNG supporting software. The 
-complete set, available at http:/www.schaik.com/pngsuite/, contains 
+The 15 "bas*.png" images are part of the much larger PngSuite test-set of
+images, available for developers of PNG supporting software. The
+complete set, available at http:/www.schaik.com/pngsuite/, contains
 a variety of images to test interlacing, gamma settings, ancillary
 chunks, etc.

+The "ft*.png" images are "free/libre" replacements for the transparent
+corresponding t*.png images in the PngSuite.
+
 The images in this directory represent the basic PNG color-types:
 grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
 (1-8 bit) and grayscale or color images with alpha channel. You
 can use them to test the proper functioning of PNG software.

-    filename      depth type
+    filename       depth type
    ------------ ------ --------------
-    basn0g01.png  1-bit grayscale
-    basn0g02.png  2-bit grayscale
-    basn0g04.png  4-bit grayscale
-    basn0g08.png  8-bit grayscale
-    basn0g16.png 16-bit grayscale
-    basn2c08.png  8-bit truecolor
-    basn2c16.png 16-bit truecolor
-    basn3p01.png  1-bit paletted
-    basn3p02.png  2-bit paletted
-    basn3p04.png  4-bit paletted
-    basn3p08.png  8-bit paletted
-    basn4a08.png  8-bit gray with alpha
-    basn4a16.png 16-bit gray with alpha
-    basn6a08.png  8-bit RGBA
-    basn6a16.png 16-bit RGBA
+    basn0g01.png   1-bit grayscale
+    basn0g02.png   2-bit grayscale
+    basn0g04.png   4-bit grayscale
+    basn0g08.png   8-bit grayscale
+    basn0g16.png  16-bit grayscale
+    basn2c08.png   8-bit truecolor
+    basn2c16.png  16-bit truecolor
+    basn3p01.png   1-bit paletted
+    basn3p02.png   2-bit paletted
+    basn3p04.png   4-bit paletted
+    basn3p08.png   8-bit paletted
+    basn4a08.png   8-bit gray with alpha
+    basn4a16.png  16-bit gray with alpha
+    basn6a08.png   8-bit RGBA
+    basn6a16.png  16-bit RGBA

-Here is the correct result of typing "pngtest -m *.png" in
+    ftbbn0g04.png  4-bit grayscale, black bKGD
+    ftbbn2c16.png 16-bit truecolor, black bKGD
+    ftbbn3p08.png  8-bit paletted, black bKGD
+    ftbgn2c16.png 16-bit truecolor, gray bKGD
+    ftbgn3p08.png  8-bit paletted, gray bKGD
+    ftbrn2c08.png  8-bit truecolor, red bKGD
+    ftbwn0g16.png 16-bit gray, white bKGD
+    ftbwn3p08.png  8-bit paletted, white bKGD
+    ftbyn3p08.png  8-bit paletted, yellow bKGD
+    ftp0n0g08.png  8-bit grayscale, opaque
+    ftp0n2c08.png  8-bit truecolor, opaque
+    ftp0n3p08.png  8-bit paletted, opaque
+    ftp1n3p08.png  8-bit paletted, no bKGD
+
+Here is the correct result of typing "pngtest -m bas*.png" in
 this directory:

 Testing basn0g01.png: PASS (524 zero samples)
--- a/contrib/pngsuite/ftbbn1g04.png
+++ b/contrib/pngsuite/ftbbn1g04.png
--- a/contrib/pngsuite/ftbbn2c16.png
+++ b/contrib/pngsuite/ftbbn2c16.png
--- a/contrib/pngsuite/ftbbn3p08.png
+++ b/contrib/pngsuite/ftbbn3p08.png
--- a/contrib/pngsuite/ftbgn2c16.png
+++ b/contrib/pngsuite/ftbgn2c16.png
--- a/contrib/pngsuite/ftbgn3p08.png
+++ b/contrib/pngsuite/ftbgn3p08.png
--- a/contrib/pngsuite/ftbrn2c08.png
+++ b/contrib/pngsuite/ftbrn2c08.png
--- a/contrib/pngsuite/ftbwn1g16.png
+++ b/contrib/pngsuite/ftbwn1g16.png
--- a/contrib/pngsuite/ftbwn3p08.png
+++ b/contrib/pngsuite/ftbwn3p08.png
--- a/contrib/pngsuite/ftbyn3p08.png
+++ b/contrib/pngsuite/ftbyn3p08.png
--- a/contrib/pngsuite/ftp0n1g08.png
+++ b/contrib/pngsuite/ftp0n1g08.png
--- a/contrib/pngsuite/ftp0n2c08.png
+++ b/contrib/pngsuite/ftp0n2c08.png
--- a/contrib/pngsuite/ftp0n3p08.png
+++ b/contrib/pngsuite/ftp0n3p08.png
--- a/contrib/pngsuite/ftp1n3p08.png
+++ b/contrib/pngsuite/ftp1n3p08.png
--- a/contrib/visupng/PngFile.c
+++ b/contrib/visupng/PngFile.c
@@ -1,12 +1,13 @@
-//-------------------------------------
-//  PNGFILE.C -- Image File Functions
-//-------------------------------------
-
-// Copyright 2000, Willem van Schaik.
-//
-// This code is released under the libpng license.
-// For conditions of distribution and use, see the disclaimer
-// and license in png.h
+/*-------------------------------------
+ *  PNGFILE.C -- Image File Functions
+ *-------------------------------------
+ *
+ * Copyright 2000, Willem van Schaik.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */

 #include <windows.h>
 #include <commdlg.h>
@@ -28,7 +29,7 @@ static png_structp png_ptr = NULL;
 static png_infop info_ptr = NULL;


-// cexcept interface
+/* cexcept interface */

 static void
 png_cexcept_error(png_structp png_ptr, png_const_charp msg)
@@ -43,7 +44,7 @@ png_cexcept_error(png_structp png_ptr, png_const_charp msg)
   }
 }

-// Windows open-file functions
+/* Windows open-file functions */

 void PngFileInitialize (HWND hwnd)
 {
@@ -57,13 +58,13 @@ void PngFileInitialize (HWND hwnd)
    ofn.lpstrCustomFilter = NULL;
    ofn.nMaxCustFilter    = 0;
    ofn.nFilterIndex      = 0;
-    ofn.lpstrFile         = NULL;          // Set in Open and Close functions
+    ofn.lpstrFile         = NULL;          /* Set in Open and Close functions */
    ofn.nMaxFile          = MAX_PATH;
-    ofn.lpstrFileTitle    = NULL;          // Set in Open and Close functions
+    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.Flags             = 0;             /* Set in Open and Close functions */
    ofn.nFileOffset       = 0;
    ofn.nFileExtension    = 0;
    ofn.lpstrDefExt       = TEXT ("png");
@@ -92,7 +93,7 @@ BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
    return GetSaveFileName (&ofn);
 }

-// PNG image handler functions
+/* PNG image handler functions */

 BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor)
@@ -109,7 +110,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
    static png_byte   **ppbRowPointers = NULL;
    int                 i;

-    // open the PNG input file
+    /* open the PNG input file */

    if (!pstrFileName)
    {
@@ -123,7 +124,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        return FALSE;
    }

-    // first check the eight byte PNG signature
+    /* first check the eight byte PNG signature */

    fread(pbSig, 1, 8, pfFile);
    if (png_sig_cmp(pbSig, 0, 8))
@@ -132,7 +133,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        return FALSE;
    }

-    // create the two png(-info) structures
+    /* 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);
@@ -152,31 +153,37 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,

    Try
    {
-        
-        // initialize the png structure
-        
+
+        /* initialize the png structure */
+
 #ifdef PNG_STDIO_SUPPORTED
        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
-        
+
+        /* read all PNG info up to image data */
+
        png_read_info(png_ptr, info_ptr);
-        
-        // get width, height, bit-depth and color-type
-        
+
+        /* 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);
+
+        /* expand images of all color-type and bit-depth to 3x8-bit RGB */
+        /* let the library process alpha, transparency, background, etc. */
+
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+    if (iBitDepth == 16)
+#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+        png_set_scale_16(png_ptr);
+#  else
+        png_set_strip_16(png_ptr);
+#  endif
+#endif
        if (iColorType == PNG_COLOR_TYPE_PALETTE)
            png_set_expand(png_ptr);
        if (iBitDepth < 8)
@@ -186,8 +193,8 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        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.
+
+        /* 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);
@@ -199,30 +206,30 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        {
            pBkgColor = NULL;
        }
-        
-        // if required set gamma conversion
+
+        /* 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
-        
+
+        /* after the transformations are 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
-        
+
+        /* 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
-        
+
+
+        /* 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
-        
+
+        /* now we can allocate memory to store the image */
+
        if (pbImageData)
        {
            free (pbImageData);
@@ -234,34 +241,34 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
            png_error(png_ptr, "Visual PNG: out of memory");
        }
        *ppbImageData = pbImageData;
-        
-        // and allocate memory for an array of row-pointers
-        
+
+        /* 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
-        
+
+        /* 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
-        
+
+        /* 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)
-        
+
+        /* read the additional chunks in the PNG file (not really needed) */
+
        png_read_end(png_ptr, NULL);
-        
-        // and we're done
-        
+
+        /* and we're done */
+
        free (ppbRowPointers);
        ppbRowPointers = NULL;
-        
-        // yepp, done
+
+        /* yepp, done */
    }

    Catch (msg)
@@ -269,7 +276,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

        *ppbImageData = pbImageData = NULL;
-        
+
        if(ppbRowPointers)
            free (ppbRowPointers);

@@ -295,7 +302,7 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    static png_byte   **ppbRowPointers = NULL;
    int                 i;

-    // open the PNG output file
+    /* open the PNG output file */

    if (!pstrFileName)
        return FALSE;
@@ -303,7 +310,7 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
    if (!(pfFile = fopen(pstrFileName, "wb")))
        return FALSE;

-    // prepare the standard PNG structures
+    /* 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);
@@ -322,60 +329,60 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,

    Try
    {
-        // initialize the png structure
-        
+        /* initialize the png structure */
+
 #ifdef PNG_STDIO_SUPPORTED
        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
-        
+
+        /* 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
-        
+
+        /* write the file header information */
+
        png_write_info(png_ptr, info_ptr);
-        
-        // swap the BGR pixels in the DiData structure to RGB
-        
+
+        /* swap the BGR pixels in the DiData structure to RGB */
+
        png_set_bgr(png_ptr);
-        
-        // row_bytes is the width x number of channels
-        
+
+        /* row_bytes is the width x number of channels */
+
        ulRowBytes = iWidth * ciChannels;
-        
-        // we can allocate memory for an array of row-pointers
-        
+
+        /* 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
-        
+
+        /* 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
-        
+
+        /* 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)
-        
+
+        /* write the additional chunks to the PNG file (not really needed) */
+
        png_write_end(png_ptr, info_ptr);
-        
-        // and we're done
-        
+
+        /* and we're done */
+
        free (ppbRowPointers);
        ppbRowPointers = NULL;
-        
-        // 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);
-        
-        // yepp, done
+
+        /* yepp, done */
    }

    Catch (msg)
@@ -389,9 +396,9 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,

        return FALSE;
    }
-    
+
    fclose (pfFile);
-    
+
    return TRUE;
 }

@@ -437,6 +444,7 @@ png_flush(png_structp png_ptr)

 #endif

-//-----------------
-//  end of source
-//-----------------
+/*-----------------
+ *  end of source
+ *-----------------
+ */
--- a/contrib/visupng/PngFile.h
+++ b/contrib/visupng/PngFile.h
@@ -1,12 +1,12 @@
-//------------------------------------------
-//  PNGFILE.H -- Header File for pngfile.c
-//------------------------------------------
+/*------------------------------------------*/
+/*  PNGFILE.H -- Header File for pngfile.c*/
+/*------------------------------------------*/

-// Copyright 2000, Willem van Schaik.
+/* Copyright 2000, Willem van Schaik.*/

-// This code is released under the libpng license.
-// For conditions of distribution and use, see the disclaimer
-// and license in png.h
+/* This code is released under the libpng license.*/
+/* For conditions of distribution and use, see the disclaimer*/
+/* and license in png.h*/

 #include <stdio.h>
 #include <stdlib.h>
--- a/contrib/visupng/README.txt
+++ b/contrib/visupng/README.txt
@@ -8,8 +8,8 @@ For conditions of distribution and use, see the disclaimer
 and license 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 
+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".

 ------------------------------------------------------------------------
--- a/contrib/visupng/VisualPng.c
+++ b/contrib/visupng/VisualPng.c
@@ -1,41 +1,42 @@
-//------------------------------------
-//  VisualPng.C -- Shows a PNG image
-//------------------------------------
+/*------------------------------------
+ *  VisualPng.C -- Shows a PNG image
+ *------------------------------------
+ *
+ * Copyright 2000, Willem van Schaik.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */

-// Copyright 2000, Willem van Schaik.
+/* switches */

-// This code is released under the libpng license.
-// For conditions of distribution and use, see the disclaimer
-// and license in png.h
-
-// switches
-
-// defines
+/* defines */

 #define PROGNAME  "VisualPng"
 #define LONGNAME  "Win32 Viewer for PNG-files"
 #define VERSION   "1.0 of 2000 June 07"

-// constants
+/* constants */

 #define MARGIN 8

-// standard includes
+/* standard includes */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <windows.h>

-// application includes
+/* application includes */

 #include "png.h"
 #include "pngfile.h"
 #include "resource.h"

-// macros
+/* macros */

-// function prototypes
+/* function prototypes */

 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
 BOOL    CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
@@ -65,14 +66,14 @@ BOOL FillBitmap (
        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
        BOOL bStretched);

-// a few global variables
+/* a few global variables */

 static char *szProgName = PROGNAME;
 static char *szAppName = LONGNAME;
 static char *szIconName = PROGNAME;
 static char szCmdFileName [MAX_PATH];

-// MAIN routine
+/* MAIN routine */

 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
@@ -90,7 +91,7 @@ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
    wndclass.hInstance     = hInstance;
    wndclass.hIcon         = LoadIcon (hInstance, szIconName) ;
    wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW);
-    wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH);
+    wndclass.hbrBackground = NULL; /* (HBRUSH) GetStockObject (GRAY_BRUSH); */
    wndclass.lpszMenuName  = szProgName;
    wndclass.lpszClassName = szProgName;

@@ -101,7 +102,7 @@ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
        return 0;
    }

-    // if filename given on commandline, store it
+    /* if filename given on commandline, store it */
    if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
        if (szCmdLine[0] == '"')
            strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
@@ -110,20 +111,20 @@ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
    else
        strcpy (szCmdFileName, "");

-    // calculate size of window-borders
+    /* 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? */
+                     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,
+/*      CW_USEDEFAULT, CW_USEDEFAULT, */
        NULL, NULL, hInstance, NULL);

    ShowWindow (hwnd, iCmdShow);
@@ -180,29 +181,29 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,

        strcpy (szImgPathName, "");

-        // in case we process file given on command-line
+        /* 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
+            /* read the other png-files in the directory for later */
+            /* next/previous commands */

            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
                          &iPngFileIndex);

-            // load the image from file
+            /* load the image from file */

            if (!LoadImageFile (hwnd, szImgPathName,
                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
                return 0;

-            // invalidate the client area for later update
+            /* invalidate the client area for later update */

            InvalidateRect (hwnd, NULL, TRUE);

-            // display the PNG into the DIBitmap
+            /* display the PNG into the DIBitmap */

            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
@@ -214,11 +215,11 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
        cxWinSize = LOWORD (lParam);
        cyWinSize = HIWORD (lParam);

-        // invalidate the client area for later update
+        /* invalidate the client area for later update */

        InvalidateRect (hwnd, NULL, TRUE);

-        // display the PNG into the DIBitmap
+        /* display the PNG into the DIBitmap */

        DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
            pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
@@ -242,28 +243,28 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
        {
        case IDM_FILE_OPEN:

-            // show the File Open dialog box
+            /* 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
+            /* read the other png-files in the directory for later */
+            /* next/previous commands */

            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
                          &iPngFileIndex);

-            // load the image from file
+            /* load the image from file */

            if (!LoadImageFile (hwnd, szImgPathName,
                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
                return 0;

-            // invalidate the client area for later update
+            /* invalidate the client area for later update */

            InvalidateRect (hwnd, NULL, TRUE);

-            // display the PNG into the DIBitmap
+            /* display the PNG into the DIBitmap */

            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
@@ -272,12 +273,12 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,

        case IDM_FILE_SAVE:

-            // show the File Save dialog box
+            /* show the File Save dialog box */

            if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
                return 0;

-            // save the PNG to a disk file
+            /* save the PNG to a disk file */

            SetCursor (LoadCursor (NULL, IDC_WAIT));
            ShowCursor (TRUE);
@@ -295,55 +296,55 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,

        case IDM_FILE_NEXT:

-            // read next entry in the directory
+            /* read next entry in the directory */

            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
                NULL, szImgPathName))
            {
                if (strcmp (szImgPathName, "") == 0)
                    return 0;
-                
-                // load the image from file
-                
+
+                /* load the image from file */
+
                if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
                        &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
                    return 0;
-                
-                // invalidate the client area for later update
-                
+
+                /* invalidate the client area for later update */
+
                InvalidateRect (hwnd, NULL, TRUE);
-                
-                // display the PNG into the DIBitmap
-                
+
+                /* 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
+            /* read previous entry in the directory */

            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
                szImgPathName, NULL))
            {
-                
+
                if (strcmp (szImgPathName, "") == 0)
                    return 0;
-                
-                // load the image from file
-                
+
+                /* load the image from file */
+
                if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
                    &cyImgSize, &cImgChannels, &bkgColor))
                    return 0;
-                
-                // invalidate the client area for later update
-                
+
+                /* invalidate the client area for later update */
+
                InvalidateRect (hwnd, NULL, TRUE);
-                
-                // display the PNG into the DIBitmap
-                
+
+                /* display the PNG into the DIBitmap */
+
                DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
                    pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
            }
@@ -352,9 +353,9 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,

        case IDM_FILE_EXIT:

-            // more cleanup needed...
+            /* more cleanup needed... */

-            // free image buffer
+            /* free image buffer */

            if (pDib != NULL)
            {
@@ -362,7 +363,7 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
                pDib = NULL;
            }

-            // free file-list
+            /* free file-list */

            if (pPngFileList != NULL)
            {
@@ -370,7 +371,7 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
                pPngFileList = NULL;
            }

-            // let's go ...
+            /* let's go ... */

            exit (0);

@@ -383,11 +384,11 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
            else
                CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);

-            // invalidate the client area for later update
+            /* invalidate the client area for later update */

            InvalidateRect (hwnd, NULL, TRUE);

-            // display the PNG into the DIBitmap
+            /* display the PNG into the DIBitmap */

            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
@@ -398,7 +399,7 @@ LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
            DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
            return 0;

-        } // end switch
+        } /* end switch */

        break;

@@ -450,10 +451,10 @@ BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
     return FALSE ;
 }

-//---------------
-//  CenterAbout
-//---------------
-
+/*---------------
+ *  CenterAbout
+ *---------------
+ */
 BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
 {
   RECT    rChild, rParent, rWorkArea;
@@ -461,19 +462,19 @@ BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
   int     xNew, yNew;
   BOOL  bResult;

-   // Get the Height and Width of the child window
+   /* 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
+   /* 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'
+   /* Get the limits of the 'workarea' */
   bResult = SystemParametersInfo(
-      SPI_GETWORKAREA,  // system parameter to query or set
+      SPI_GETWORKAREA,  /* system parameter to query or set */
      sizeof(RECT),
      &rWorkArea,
      0);
@@ -483,7 +484,7 @@ BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
      rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
   }

-   // Calculate new X position, then adjust for workarea
+   /* Calculate new X position, then adjust for workarea */
   xNew = rParent.left + ((wParent - wChild) /2);
   if (xNew < rWorkArea.left) {
      xNew = rWorkArea.left;
@@ -491,7 +492,7 @@ BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
      xNew = rWorkArea.right - wChild;
   }

-   // Calculate new Y position, then adjust for workarea
+   /* Calculate new Y position, then adjust for workarea */
   yNew = rParent.top  + ((hParent - hChild) /2);
   if (yNew < rWorkArea.top) {
      yNew = rWorkArea.top;
@@ -499,15 +500,15 @@ BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
      yNew = rWorkArea.bottom - hChild;
   }

-   // Set it, and return
+   /* Set it, and return */
   return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
          SWP_NOZORDER);
 }

-//----------------
-//  BuildPngList
-//----------------
-
+/*----------------
+ *  BuildPngList
+ *----------------
+ */
 BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
     int *pFileIndex)
 {
@@ -523,7 +524,7 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
    int                       i, ii;
    int                       j, jj;

-    // free previous file-list
+    /* free previous file-list */

    if (*ppFileList != NULL)
    {
@@ -531,7 +532,7 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
        *ppFileList = NULL;
    }

-    // extract foldername, filename and search-name
+    /* extract foldername, filename and search-name */

    strcpy (szImgPathName, pstrPathName);
    strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
@@ -540,7 +541,7 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
    *(strrchr (szImgFindName, '\\') + 1) = '\0';
    strcat (szImgFindName, "*.png");

-    // first cycle: count number of files in directory for memory allocation
+    /* first cycle: count number of files in directory for memory allocation */

    *pFileCount = 0;

@@ -554,11 +555,11 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
    }
    FindClose(hFind);

-    // allocation memory for file-list
+    /* allocation memory for file-list */

    *ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);

-    // second cycle: read directory and store filenames in file-list
+    /* second cycle: read directory and store filenames in file-list */

    hFind = FindFirstFile(szImgFindName, &finddata);
    bOk = (hFind != (HANDLE) -1);
@@ -580,7 +581,7 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
    }
    FindClose(hFind);

-    // finally we must sort the file-list
+    /* finally we must sort the file-list */

    for (i = 0; i < *pFileCount - 1; i++)
    {
@@ -594,7 +595,7 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
                strcpy (*ppFileList + jj, *ppFileList + ii);
                strcpy (*ppFileList + ii, szTmp);

-                // check if this was the current image that we moved
+                /* check if this was the current image that we moved */

                if (*pFileIndex == i)
                    *pFileIndex = j;
@@ -608,9 +609,10 @@ BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
    return TRUE;
 }

-//----------------
-//  SearchPngList
-//----------------
+/*----------------
+ *  SearchPngList
+ *----------------
+ */

 BOOL SearchPngList (
        TCHAR *pFileList, int FileCount, int *pFileIndex,
@@ -618,30 +620,30 @@ BOOL SearchPngList (
 {
    if (FileCount > 0)
    {
-        // get previous entry
-        
+        /* get previous entry */
+
        if (pstrPrevName != NULL)
        {
            if (*pFileIndex > 0)
                *pFileIndex -= 1;
            else
                *pFileIndex = FileCount - 1;
-            
+
            strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH));
        }
-        
-        // get next entry
-        
+
+        /* get next entry */
+
        if (pstrNextName != NULL)
        {
            if (*pFileIndex < FileCount - 1)
                *pFileIndex += 1;
            else
                *pFileIndex = 0;
-            
+
            strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH));
        }
-        
+
        return TRUE;
    }
    else
@@ -650,9 +652,10 @@ BOOL SearchPngList (
    }
 }

-//-----------------
-//  LoadImageFile
-//-----------------
+/*-----------------
+ *  LoadImageFile
+ *-----------------
+ */

 BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
                png_byte **ppbImage, int *pxImgSize, int *pyImgSize,
@@ -660,7 +663,7 @@ BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
 {
    static TCHAR szTmp [MAX_PATH];

-    // if there's an existing PNG, free the memory
+    /* if there's an existing PNG, free the memory */

    if (*ppbImage)
    {
@@ -668,7 +671,7 @@ BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
        *ppbImage = NULL;
    }

-    // Load the entire PNG into memory
+    /* Load the entire PNG into memory */

    SetCursor (LoadCursor (NULL, IDC_WAIT));
    ShowCursor (TRUE);
@@ -694,10 +697,10 @@ BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
    return TRUE;
 }

-//----------------
-//  DisplayImage
-//----------------
-
+/*----------------
+ *  DisplayImage
+ *----------------
+ */
 BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
        BYTE **ppDiData, int cxWinSize, int cyWinSize,
        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
@@ -705,14 +708,14 @@ BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
 {
    BYTE                       *pDib = *ppDib;
    BYTE                       *pDiData = *ppDiData;
-    // BITMAPFILEHEADER        *pbmfh;
+    /* 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
+    /* allocate memory for the Device Independant bitmap */

    wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;

@@ -733,7 +736,7 @@ BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
    *ppDib = pDib;
    memset (pDib, 0, sizeof(BITMAPINFOHEADER));

-    // initialize the dib-structure
+    /* initialize the dib-structure */

    pbmih = (BITMAPINFOHEADER *) pDib;
    pbmih->biSize = sizeof(BITMAPINFOHEADER);
@@ -745,11 +748,11 @@ BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
    pDiData = pDib + sizeof(BITMAPINFOHEADER);
    *ppDiData = pDiData;

-    // first fill bitmap with gray and image border
+    /* first fill bitmap with gray and image border */

    InitBitmap (pDiData, cxWinSize, cyWinSize);

-    // then fill bitmap with image
+    /* then fill bitmap with image */

    if (pbImage)
    {
@@ -762,16 +765,16 @@ BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
    return TRUE;
 }

-//--------------
-//  InitBitmap
-//--------------
-
+/*--------------
+ *  InitBitmap
+ *--------------
+ */
 BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
 {
    BYTE *dst;
    int x, y, col;

-    // initialize the background with gray
+    /* initialize the background with gray */

    dst = pDiData;
    for (y = 0; y < cyWinSize; y++)
@@ -779,13 +782,13 @@ BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
        col = 0;
        for (x = 0; x < cxWinSize; x++)
        {
-            // fill with GRAY
+            /* fill with GRAY */
            *dst++ = 127;
            *dst++ = 127;
            *dst++ = 127;
            col += 3;
        }
-        // rows start on 4 byte boundaries
+        /* rows start on 4 byte boundaries */
        while ((col % 4) != 0)
        {
            dst++;
@@ -796,10 +799,10 @@ BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
    return TRUE;
 }

-//--------------
-//  FillBitmap
-//--------------
-
+/*--------------
+ *  FillBitmap
+ *--------------
+ */
 BOOL FillBitmap (
        BYTE *pDiData, int cxWinSize, int cyWinSize,
        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
@@ -824,11 +827,12 @@ BOOL FillBitmap (
        cxNewSize = cxWinSize - 2 * MARGIN;
        cyNewSize = cyWinSize - 2 * MARGIN;

-        // stretch the image to it's window determined size
+        /* 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))
+        /* the following two are mathematically 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;
@@ -867,12 +871,12 @@ BOOL FillBitmap (
            }
        }

-        // calculate row-bytes
+        /* calculate row-bytes */

        wImgRowBytes = cImgChannels * cxNewSize;
        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;

-        // copy image to screen
+        /* copy image to screen */

        for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++)
        {
@@ -888,7 +892,7 @@ BOOL FillBitmap (
                r = *src++;
                g = *src++;
                b = *src++;
-                *dst++ = b; /* note the reverse order */
+                *dst++ = b; /* note the reverse order  */
                *dst++ = g;
                *dst++ = r;
                if (cImgChannels == 4)
@@ -898,7 +902,7 @@ BOOL FillBitmap (
            }
        }

-        // free memory
+        /* free memory */

        if (pStretchedImage != NULL)
        {
@@ -908,28 +912,28 @@ BOOL FillBitmap (

    }

-    // process the image not-stretched
+    /* process the image not-stretched */

    else
    {
-        // calculate the central position
+        /* calculate the central position */

        cxImgPos = (cxWinSize - cxImgSize) / 2;
        cyImgPos = (cyWinSize - cyImgSize) / 2;

-        // check for image larger than window
+        /* check for image larger than window */

        if (cxImgPos < MARGIN)
            cxImgPos = MARGIN;
        if (cyImgPos < MARGIN)
            cyImgPos = MARGIN;

-        // calculate both row-bytes
+        /* calculate both row-bytes */

        wImgRowBytes = cImgChannels * cxImgSize;
        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;

-        // copy image to screen
+        /* copy image to screen */

        for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++)
        {
@@ -945,7 +949,7 @@ BOOL FillBitmap (
                r = *src++;
                g = *src++;
                b = *src++;
-                *dst++ = b; /* note the reverse order */
+                *dst++ = b; /* note the reverse order  */
                *dst++ = g;
                *dst++ = r;
                if (cImgChannels == 4)
@@ -959,6 +963,7 @@ BOOL FillBitmap (
    return TRUE;
 }

-//-----------------
-//  end of source
-//-----------------
+/*-----------------
+ *  end of source
+ *-----------------
+ */
--- a/contrib/visupng/resource.h
+++ b/contrib/visupng/resource.h
@@ -12,7 +12,7 @@
 #define IDM_HELP_ABOUT                  40008

 // Next default values for new objects
-// 
+//
 #ifdef APSTUDIO_INVOKED
 #ifndef APSTUDIO_READONLY_SYMBOLS
 #define _APS_NEXT_RESOURCE_VALUE        113
--- a/example.c
+++ b/example.c
@@ -2,18 +2,19 @@
 #if 0 /* in case someone actually tries to compile this */

 /* example.c - an example of using libpng
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * This file has been placed in the public domain by the authors.
- * Maintained 1998-2010 Glenn Randers-Pehrson
- * Maintained 1996, 1997 Andreas Dilger)
- * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
+ * Maintained 1998-2011 Glenn Randers-Pehrson
+ * Maintained 1996, 1997 Andreas Dilger
+ * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 */

 /* 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
+ * The file libpng-manual.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, is hereby placed
 * in the public domain, and therefore does not require a copyright notice.
+ * To the extent possible under law, the authors have waived all copyright and
+ * related or neighboring rights to this file.
 *
 * This file does not currently compile, because it is missing certain
 * parts, like allocating memory to hold an image.  You will have to
@@ -22,6 +23,10 @@
 * see also the programs in the contrib directory.
 */

+#define _POSIX_SOURCE 1  /* libpng and zlib are POSIX-compliant.  You may
+                          * change this if your application uses non-POSIX
+                          * extensions. */
+
 #include "png.h"

 /* The png_jmpbuf() macro, used in error handling, became available in
@@ -183,8 +188,15 @@ void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
    * are mutually exclusive.
    */

-   /* Tell libpng to strip 16 bit/color files down to 8 bits/color */
+   /* Tell libpng to strip 16 bit/color files down to 8 bits/color.
+    * Use accurate scaling if it's available, otherwise just chop off the
+    * low byte.
+    */
+#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+    png_set_scale_16(png_ptr);
+#else
   png_set_strip_16(png_ptr);
+#endif

   /* Strip alpha bytes from the input data without combining with the
    * background (not recommended).
@@ -330,11 +342,16 @@ void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
   /* Add filler (or alpha) byte (before/after each RGB triplet) */
   png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);

+#ifdef PNG_READ_INTERLACING_SUPPORTED
   /* Turn on interlace handling.  REQUIRED if you are not using
    * png_read_image().  To see how to handle interlacing passes,
    * see the png_read_row() method below:
    */
   number_passes = png_set_interlace_handling(png_ptr);
+#else
+   number_passes = 1;
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
+

   /* Optional call to gamma correct and add the background to the palette
    * and update info structure.  REQUIRED if you are expecting libpng to
@@ -511,20 +528,18 @@ row_callback(png_structp png_ptr, png_bytep new_row,
    * shown below:
    */

-   /* Check if row_num is in bounds. */
-   if ((row_num >= 0) && (row_num < height))
-   {
-     /* Get pointer to corresponding row in our
-      * PNG read buffer.
-      */
-     png_bytep old_row = ((png_bytep *)our_data)[row_num];
+   /* Get pointer to corresponding row in our
+    * PNG read buffer.
+    */
+   png_bytep old_row = ((png_bytep *)our_data)[row_num];
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+   /* If both rows are allocated then copy the new row
+    * data to the corresponding row data.
+    */
+   if ((old_row != NULL) && (new_row != NULL))
+   png_progressive_combine_row(png_ptr, old_row, new_row);

-     /* If both rows are allocated then copy the new row
-      * data to the corresponding row data.
-      */
-     if ((old_row != NULL) && (new_row != NULL))
-     png_progressive_combine_row(png_ptr, old_row, new_row);
-   }
   /*
    * The rows and passes are called in order, so you don't really
    * need the row_num and pass, but I'm supplying them because it
@@ -547,6 +562,7 @@ row_callback(png_structp png_ptr, png_bytep new_row,
    * to pass the current row as new_row, and the function will combine
    * the old row and the new row.
    */
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
 }

 end_callback(png_structp png_ptr, png_infop info)
@@ -658,14 +674,18 @@ void write_png(char *file_name /* , ... other image information ... */)

   /* Optional significant bit (sBIT) chunk */
   png_color_8 sig_bit;
+
   /* If we are dealing with a grayscale image then */
   sig_bit.gray = true_bit_depth;
+
   /* Otherwise, if we are dealing with a color image then */
   sig_bit.red = true_red_bit_depth;
   sig_bit.green = true_green_bit_depth;
   sig_bit.blue = true_blue_bit_depth;
+
   /* If the image has an alpha channel then */
   sig_bit.alpha = true_alpha_bit_depth;
+
   png_set_sBIT(png_ptr, info_ptr, &sig_bit);


@@ -757,6 +777,7 @@ void write_png(char *file_name /* , ... other image information ... */)
   /* Turn on interlace handling if you are not using png_write_image() */
   if (interlacing)
      number_passes = png_set_interlace_handling(png_ptr);
+
   else
      number_passes = 1;

--- a/libpng-config.in
+++ b/libpng-config.in
@@ -104,8 +104,8 @@ while test $# -gt 0; do
        ;;

    --ldopts)
-    	echo ${ldopts}
-	;;
+        echo ${ldopts}
+        ;;

    --ldflags)
        echo ${ldopts} ${L_opts} ${R_opts} ${libs}
@@ -113,7 +113,7 @@ while test $# -gt 0; do

    --static)
        R_opts=""
-	libs=${all_libs}
+        libs=${all_libs}
        ;;

    *)
--- a/libpng-1.5.0beta18.txt
+++ b/libpng-1.5.0beta18.txt
--- a/libpng.3
+++ b/libpng.3
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,806 +1,26 @@
-.TH LIBPNGPF 3 "April 18, 2010"
+.TH LIBPNGPF 3 "December 8, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.0beta18
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.7rc03
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

 \fI\fB

-\fBvoid png_64bit_product (long \fP\fIv1\fP\fB, long \fP\fIv2\fP\fB, unsigned long \fI*hi_product,
+\fBAs of libpng version \fP\fI1.5.1\fP\fB, this section is no longer \fP\fImaintained\fP\fB, now \fIthat

-\fBunsigned long \fI*lo_product\fP\fB);\fP
+\fBthe private function prototypes are hidden in pngpriv.h and not \fIaccessible

-\fI\fB
+\fBto applications. Look in pngpriv.h for the prototypes and a short \fIdescription

-\fBvoid png_build_gamma_table (png_structp \fP\fIpng_ptr\fP\fB, png_byte \fIbit_depth\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_build_grayscale_palette (int \fP\fIbit_depth\fP\fB, png_colorp \fIpalette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_calculate_crc (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIptr\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_check_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIint_white_x\fP\fB, png_fixed_point \fP\fIint_white_y\fP\fB, png_fixed_point \fP\fIint_red_x\fP\fB, png_fixed_point \fP\fIint_red_y\fP\fB, png_fixed_point \fP\fIint_green_x\fP\fB, png_fixed_point \fP\fIint_green_y\fP\fB, png_fixed_point \fP\fIint_blue_x\fP\fB, png_fixed_point \fIint_blue_y\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_size_t png_check_keyword (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charpp \fInew_key\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_check_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIinterlace_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fIfilter_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fImask\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_correct_palette (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_crc_error (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_crc_finish (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIskip\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_crc_read (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuf\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_debug(int \fP\fIlevel\fP\fB, png_const_charp \fImessage\fP\fB);\fP
-
-\fI\fB
-
-\fBint png_debug1(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fIp1\fP\fB);\fP
-
-\fI\fB
-
-\fBint png_debug2(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fP\fIp1\fP\fB, \fIp2\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\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
-
-\fI\fB
-
-\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_background (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fP\fItrans_color\fP\fB, png_color_16p \fP\fIbackground\fP\fB, png_color_16p \fP\fIbackground_1\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_bytep \fP\fIgamma_from_1\fP\fB, png_bytep \fP\fIgamma_to_1\fP\fB, png_uint_16pp \fP\fIgamma_16\fP\fB, png_uint_16pp \fP\fIgamma_16_from_1\fP\fB, png_uint_16pp \fP\fIgamma_16_to_1\fP\fB, int \fIgamma_shift\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_do_expand (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fItrans_value\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_expand_palette (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fInum_trans\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_gamma (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_uint_16pp \fP\fIgamma_16_table\fP\fB, int \fIgamma_shift\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_pack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIbit_depth\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_quantize (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIpalette_lookup\fP\fB, png_bytep \fIquantize_lookup\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_read_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_read_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fP\fIpass\fP\fB, png_uint_32 \fItransformations\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_read_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_do_read_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_do_rgb_to_gray (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_shift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIbit_depth\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_strip_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_swap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_unpack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_unshift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIsig_bits\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_write_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fIpass\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_write_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_write_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_do_write_transformations (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid *png_far_to_near (png_structp png_ptr,png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fBvoid png_handle_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_handle_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_handle_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_handle_IEND (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_handle_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\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
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-\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
-
-\fI\fB
-
-\fBvoid png_handle_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_handle_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_handle_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_handle_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\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
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-\fI\fB
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-\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
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-\fI\fB
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-\fI\fB
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-\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
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-\fI\fB
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-\fI\fB
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-\fBvoid png_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
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-\fBvoid png_handle_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
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-\fBvoid png_handle_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
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-\fBvoid png_info_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_process_IDAT_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_process_some_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_crc_skip (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fI\fB
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-\fI\fB
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-\fBvoid png_push_fill_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_push_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_push_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_push_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_push_have_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_have_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_have_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
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-\fI\fB
-
-\fBvoid png_push_process_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_IDAT (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_restore_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_save_buffer (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_infop \fIend_info_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_filter_row (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIprev_row\fP\fB, int \fIfilter\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_start_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBint png_set_text_2 (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_cHRM (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\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
-
-\fI\fB
-
-\fBvoid png_write_destroy (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\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
-
-\fI\fB
-
-\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
-
-\fI\fB
-
-\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fP\fIfilter_type\fP\fB, int \fIinterlace_type\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\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
-
-\fI\fB
-
-\fBvoid png_write_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_pixels_per_unit\fP\fB, png_uint_32 \fP\fIy_pixels_per_unit\fP\fB, int \fIunit_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_uint_32 \fInum_pal\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fP\fIsbit\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\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
-
-\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
-
-\fI\fB
-
-\fBvoid png_write_sRGB (png_structp \fP\fIpng_ptr\fP\fB, int \fIintent\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fItext_len\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, png_color_16p \fP\fIvalues\fP\fB, int \fP\fInumber\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fP\fItext_len\fP\fB, int \fIcompression\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoidpf png_zalloc (voidpf \fP\fIpng_ptr\fP\fB, uInt \fP\fIitems\fP\fB, uInt \fIsize\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_zfree (voidpf \fP\fIpng_ptr\fP\fB, voidpf \fIptr\fP\fB);\fP
-
-\fI\fB
+\fBof each \fIfunction.

 \fI\fB

 .SH DESCRIPTION
-The functions listed above are used privately by libpng
+The functions previously listed here are used privately by libpng
 and are not recommended for use by applications.  They are
-not "exported" to applications using shared libraries.  They
-are listed alphabetically here as an aid to libpng maintainers.
-See png.h for more information on these functions.
+not "exported" to applications using shared libraries.

 .SH SEE ALSO
 .BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
--- a/ltmain.sh
+++ b/ltmain.sh
--- a/162
+++ b/162
@@ -1,162 +0,0 @@
-#! /bin/sh
-# mkinstalldirs --- make directory hierarchy
-
-scriptversion=2009-04-28.21; # UTC
-
-# Original author: Noah Friedman <friedman@prep.ai.mit.edu>
-# Created: 1993-05-16
-# Public domain.
-#
-# This file is maintained in Automake, please report
-# bugs to <bug-automake@gnu.org> or send patches to
-# <automake-patches@gnu.org>.
-
-nl='
-'
-IFS=" ""	$nl"
-errstatus=0
-dirmode=
-
-usage="\
-Usage: mkinstalldirs [-h] [--help] [--version] [-m MODE] DIR ...
-
-Create each directory DIR (with mode MODE, if specified), including all
-leading file name components.
-
-Report bugs to <bug-automake@gnu.org>."
-
-# process command line arguments
-while test $# -gt 0 ; do
-  case $1 in
-    -h | --help | --h*)         # -h for help
-      echo "$usage"
-      exit $?
-      ;;
-    -m)                         # -m PERM arg
-      shift
-      test $# -eq 0 && { echo "$usage" 1>&2; exit 1; }
-      dirmode=$1
-      shift
-      ;;
-    --version)
-      echo "$0 $scriptversion"
-      exit $?
-      ;;
-    --)                         # stop option processing
-      shift
-      break
-      ;;
-    -*)                         # unknown option
-      echo "$usage" 1>&2
-      exit 1
-      ;;
-    *)                          # first non-opt arg
-      break
-      ;;
-  esac
-done
-
-for file
-do
-  if test -d "$file"; then
-    shift
-  else
-    break
-  fi
-done
-
-case $# in
-  0) exit 0 ;;
-esac
-
-# Solaris 8's mkdir -p isn't thread-safe.  If you mkdir -p a/b and
-# mkdir -p a/c at the same time, both will detect that a is missing,
-# one will create a, then the other will try to create a and die with
-# a "File exists" error.  This is a problem when calling mkinstalldirs
-# from a parallel make.  We use --version in the probe to restrict
-# ourselves to GNU mkdir, which is thread-safe.
-case $dirmode in
-  '')
-    if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then
-      echo "mkdir -p -- $*"
-      exec mkdir -p -- "$@"
-    else
-      # On NextStep and OpenStep, the `mkdir' command does not
-      # recognize any option.  It will interpret all options as
-      # directories to create, and then abort because `.' already
-      # exists.
-      test -d ./-p && rmdir ./-p
-      test -d ./--version && rmdir ./--version
-    fi
-    ;;
-  *)
-    if mkdir -m "$dirmode" -p --version . >/dev/null 2>&1 &&
-       test ! -d ./--version; then
-      echo "mkdir -m $dirmode -p -- $*"
-      exec mkdir -m "$dirmode" -p -- "$@"
-    else
-      # Clean up after NextStep and OpenStep mkdir.
-      for d in ./-m ./-p ./--version "./$dirmode";
-      do
-        test -d $d && rmdir $d
-      done
-    fi
-    ;;
-esac
-
-for file
-do
-  case $file in
-    /*) pathcomp=/ ;;
-    *)  pathcomp= ;;
-  esac
-  oIFS=$IFS
-  IFS=/
-  set fnord $file
-  shift
-  IFS=$oIFS
-
-  for d
-  do
-    test "x$d" = x && continue
-
-    pathcomp=$pathcomp$d
-    case $pathcomp in
-      -*) pathcomp=./$pathcomp ;;
-    esac
-
-    if test ! -d "$pathcomp"; then
-      echo "mkdir $pathcomp"
-
-      mkdir "$pathcomp" || lasterr=$?
-
-      if test ! -d "$pathcomp"; then
-	errstatus=$lasterr
-      else
-	if test ! -z "$dirmode"; then
-	  echo "chmod $dirmode $pathcomp"
-	  lasterr=
-	  chmod "$dirmode" "$pathcomp" || lasterr=$?
-
-	  if test ! -z "$lasterr"; then
-	    errstatus=$lasterr
-	  fi
-	fi
-      fi
-    fi
-
-    pathcomp=$pathcomp/
-  done
-done
-
-exit $errstatus
-
-# Local Variables:
-# mode: shell-script
-# sh-indentation: 2
-# eval: (add-hook 'write-file-hooks 'time-stamp)
-# time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-time-zone: "UTC"
-# time-stamp-end: "; # UTC"
-# End:
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "April 18, 2010"
+.TH PNG 5 "December 8, 2011"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
--- a/png.c
+++ b/png.c
--- a/png.h
+++ b/png.h
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,9 +1,9 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng version 1.5.0beta18 - April 18, 2010
+ * libpng version 1.5.7rc03 - December 8, 2011
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 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.)
 *
@@ -22,27 +22,42 @@
 #ifndef PNGCONF_H
 #define PNGCONF_H

-/* Need the time information for converting tIME chunks, it
- * defines struct tm:
- */
-#ifdef PNG_CONVERT_tIME_SUPPORTED
-  /* "time.h" functions are not supported on WindowsCE */
-#  include <time.h>
-#endif
-
+#ifndef PNG_BUILDING_SYMBOL_TABLE
 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
 * definition file for  machine specific limits, this may impact the
 * correctness of the definitons below (see uses of INT_MAX).
 */
-#ifndef PNG_NO_LIMITS_H
-#  include <limits.h>
+#  ifndef PNG_NO_LIMITS_H
+#    include <limits.h>
+#  endif
+
+/* For the memory copy APIs (i.e. the standard definitions of these),
+ * because this file defines png_memcpy and so on the base APIs must
+ * be defined here.
+ */
+#  ifdef BSD
+#    include <strings.h>
+#  else
+#    include <string.h>
+#  endif
+
+/* For png_FILE_p - this provides the standard definition of a
+ * FILE
+ */
+#  ifdef PNG_STDIO_SUPPORTED
+#    include <stdio.h>
+#  endif
 #endif

 /* This controls optimization of the reading of 16 and 32 bit values
 * from PNG files.  It can be set on a per-app-file basis - it
 * just changes whether a macro is used to the function is called.
- * The library builder sets the default.
+ * The library builder sets the default, if read functions are not
+ * built into the library the macro implementation is forced on.
 */
+#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
+#  define PNG_USE_READ_MACROS
+#endif
 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
 #  if PNG_DEFAULT_READ_MACROS
 #    define PNG_USE_READ_MACROS
@@ -56,7 +71,8 @@
 * below) but still have compiler specific implementations, others
 * may be changed on a per-file basis when compiling against libpng.
 */
-/* This macro protects us against machines that don't have function
+
+/* The PNGARG macro protects us against machines that don't have function
 * prototypes (ie K&R style headers).  If your compiler does not handle
 * function prototypes, define this macro and use the included ansi2knr.
 * I've always been able to use _NO_PROTO as the indicator, but you may
@@ -86,9 +102,9 @@
 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 * and some others) there are multiple ways to call a function and the
 * default can be changed on the compiler command line.  For this reason
- * libpng allows the calling convention of every exported function and
- * every function called via a user supplied function pointer to be
- * specified.  This is done by defining the following macros:
+ * libpng specifies the calling convention of every exported function and
+ * every function called via a user supplied function pointer.  This is
+ * done in this file by defining the following macros:
 *
 * PNGAPI    Calling convention for exported functions.
 * PNGCBAPI  Calling convention for user provided (callback) functions.
@@ -96,16 +112,19 @@
 *           for longjmp callbacks and sometimes used internally to
 *           specify the calling convention for zlib).
 *
+ * These macros should never be overridden.  If it is necessary to
+ * change calling convention in a private build this can be done
+ * by setting PNG_API_RULE (which defaults to 0) to one of the values
+ * below to select the correct 'API' variants.
 *
- * Two common cases are supported:
- *
- * PNG_API_RULE=0  Use the operating system convention for PNGAPI and
+ * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
+ *                This is correct in every known environment.
+ * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 *                the 'C' calling convention (from PNGCAPI) for
- *                callbacks (PNGCBAPI).
- * PNG_API_RULE=1  Use PNGCAPI - the 'C' calling convention - throughout.
- *                This is correct on Cygwin implementations, assumed to
- *                be correct on MingW compilations and likely to work
- *                in C/C++ only environments everywhere else.
+ *                callbacks (PNGCBAPI).  This is no longer required
+ *                in any known environment - if it has to be used
+ *                please post an explanation of the problem to the
+ *                libpng mailing list.
 *
 * These cases only differ if the operating system does not use the C
 * calling convention, at present this just means the above cases
@@ -134,7 +153,7 @@
 * linked one.  For this reason the application must tell us by setting
 * the magic flag PNG_USE_DLL to turn on the special processing before
 * it includes png.h.
- * 
+ *
 * Four additional macros are used to make this happen:
 *
 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
@@ -145,7 +164,9 @@
 *                       'type', compiler specific.
 *
 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
- *                make a symbol exported from the DLL.
+ *                make a symbol exported from the DLL.  Not used in the
+ *                public header files; see pngpriv.h for how it is used
+ *                in the libpng build.
 *
 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 *                from a DLL - used to define PNG_IMPEXP when
@@ -156,82 +177,77 @@
 * ==========================
 * This code is used at build time to find PNG_IMPEXP, the API settings
 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
- * import processing is possible.
- *
- * NOTE: this is poorly tested and may miss many cases, the default
- * (everything empty) is harmless unless the result is a DLL that is
- * intended to be distributed!
+ * import processing is possible.  On Windows/x86 systems it also sets
+ * compiler-specific macros to the values required to change the calling
+ * conventions of the various functions.
 */
-#if defined(__CYGWIN__)
-  /* Cygwin: force PNGCAPI to cdecl. */
-#  ifndef PNGCAPI
-#    define PNGCAPI __cdecl
-#  endif
-
-  /* Provide the appropriate defaults for exporting a symbol from
-   * the DLL and forcing import.  Always set these - the choice to
-   * use them is made below.
+#if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
+      defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\
+    ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
+      defined(_M_X64) || defined(_M_IA64) )
+  /* Windows system (DOS doesn't support DLLs) running on x86/x64.  Includes
+   * builds under Cygwin or MinGW.  Also includes Watcom builds but these need
+   * special treatment because they are not compatible with GCC or Visual C
+   * because of different calling conventions.
   */
-#  ifndef PNG_DLL_EXPORT
-#    define PNG_DLL_EXPORT __declspec(dllexport)
-#  endif
-#  ifndef PNG_DLL_IMPORT
-#    define PNG_DLL_IMPORT __declspec(dllimport)
-#  endif
-
-#else /* !Cygwin */
-#  if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
-        defined(_WIN32) || defined(__WIN32__) ) &&\
-      ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
-        defined(_M_X64) || defined(_M_IA64) )
-    /* Windows system (DOS doesn't support DLLs) running on x86/x64 and
-     * not being built under Cygwin or by a MingW compiler.
+#  if PNG_API_RULE == 2
+    /* If this line results in an error, either because __watcall is not
+     * understood or because of a redefine just below you cannot use *this*
+     * build of the library with the compiler you are using.  *This* build was
+     * build using Watcom and applications must also be built using Watcom!
     */
-#    if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
-#      ifndef PNGCAPI
-#        define PNGCAPI __cdecl
-#      endif
-#      if PNG_API_RULE == 0 && !defined(PNGAPI)
-#        define PNGAPI __stdcall
-#      endif
-#    else
-      /* An older compiler, or one not detected (erroneously) above. */
-#      ifndef PNGCAPI
-#        define PNGCAPI _cdecl
-#      endif
-#      if PNG_API_RULE == 0 && !defined(PNGAPI)
-#        define PNGAPI _stdcall
-#      endif
-#    endif /* compiler/api */
-    /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
+#    define PNGCAPI __watcall
+#  endif

-#    if (defined(_MSC_VER) && _MSC_VER < 800) ||\
-        (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
-      /* older Borland and MSC
-       * compilers used '__export' and required this to be after
-       * the type.
-       */
-#      ifndef PNG_EXPORT_TYPE
-#        define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
-#      endif
-#      define PNG_DLL_EXPORT __export
-#    else /* newer compiler */
-#      define PNG_DLL_EXPORT __declspec(dllexport)
-#      ifndef PNG_DLL_IMPORT
-#        define PNG_DLL_IMPORT __declspec(dllimport)
-#      endif
-#    endif /* compiler */
+#  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
+#    define PNGCAPI __cdecl
+#    if PNG_API_RULE == 1
+#      define PNGAPI __stdcall
+#    endif
+#  else
+    /* An older compiler, or one not detected (erroneously) above,
+     * if necessary override on the command line to get the correct
+     * variants for the compiler.
+     */
+#    ifndef PNGCAPI
+#      define PNGCAPI _cdecl
+#    endif
+#    if PNG_API_RULE == 1 && !defined(PNGAPI)
+#      define PNGAPI _stdcall
+#    endif
+#  endif /* compiler/api */
+  /* NOTE: PNGCBAPI always defaults to PNGCAPI. */

-#  else /* !Cygwin && !Windows/x86 */
-#    if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
-#      ifndef PNGAPI
-#        define PNGAPI _System
-#      endif
-#    else /* !Cygwin && !Windows/x86 && !OS/2 */
-      /* Use the defaults */
-#    endif /* other system, !OS/2 */
-#  endif /* !Windows/x86 */
-#endif /* !Cygwin */
+#  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
+   ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed
+#  endif
+
+#  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
+      (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
+    /* older Borland and MSC
+     * compilers used '__export' and required this to be after
+     * the type.
+     */
+#    ifndef PNG_EXPORT_TYPE
+#      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
+#    endif
+#    define PNG_DLL_EXPORT __export
+#  else /* newer compiler */
+#    define PNG_DLL_EXPORT __declspec(dllexport)
+#    ifndef PNG_DLL_IMPORT
+#      define PNG_DLL_IMPORT __declspec(dllimport)
+#    endif
+#  endif /* compiler */
+
+#else /* !Windows/x86 */
+#  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
+#    define PNGAPI _System
+#  else /* !Windows/x86 && !OS/2 */
+    /* Use the defaults, or define PNG*API on the command line (but
+     * this will have to be done for every compile!)
+     */
+#  endif /* other system, !OS/2 */
+#endif /* !Windows/x86 */

 /* Now do all the defaulting . */
 #ifndef PNGCAPI
@@ -244,24 +260,14 @@
 #  define PNGAPI PNGCAPI
 #endif

-/* The default for PNG_IMPEXP depends on whether the library is
- * being built or used.
+/* PNG_IMPEXP may be set on the compilation system command line or (if not set)
+ * then in an internal header file when building the library, otherwise (when
+ * using the library) it is set here.
 */
 #ifndef PNG_IMPEXP
-#  ifdef PNGLIB_BUILD
-    /* Building the library */
-#    if (defined(DLL_EXPORT)/*from libtool*/ ||\
-	defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\
-	defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)
-      /* Building a DLL. */
-#      define PNG_IMPEXP PNG_DLL_EXPORT
-#    endif /* DLL */
-#  else
-    /* Using the library */
-#    if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
-      /* This forces use of a DLL, disallowing static linking */
-#      define PNG_IMPEXP PNG_DLL_IMPORT
-#    endif
+#  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
+     /* This forces use of a DLL, disallowing static linking */
+#    define PNG_IMPEXP PNG_DLL_IMPORT
 #  endif

 #  ifndef PNG_IMPEXP
@@ -269,22 +275,47 @@
 #  endif
 #endif

+/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
+ * 'attributes' as a storage class - the attributes go at the start of the
+ * function definition, and attributes are always appended regardless of the
+ * compiler.  This considerably simplifies these macros but may cause problems
+ * if any compilers both need function attributes and fail to handle them as
+ * a storage class (this is unlikely.)
+ */
+#ifndef PNG_FUNCTION
+#  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
+#endif
+
 #ifndef PNG_EXPORT_TYPE
 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 #endif
-#ifndef PNG_EXPORT
-#  define PNG_EXPORT(type, name, args, attributes, ordinal)\
-     PNG_EXPORT_TYPE(type) (PNGAPI name) PNGARG(args) attributes
+
+   /* The ordinal value is only relevant when preprocessing png.h for symbol
+    * table entries, so we discard it here.  See the .dfn files in the
+    * scripts directory.
+    */
+#ifndef PNG_EXPORTA
+
+#  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
+      PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
+        extern attributes)
 #endif

+/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
+ * so make something non-empty to satisfy the requirement:
+ */
+#define PNG_EMPTY /*empty list*/
+
+#define PNG_EXPORT(ordinal, type, name, args)\
+   PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
+
 /* Use PNG_REMOVED to comment out a removed interface. */
 #ifndef PNG_REMOVED
-#  define PNG_REMOVED(name, ordinal)
+#  define PNG_REMOVED(ordinal, type, name, args, attributes)
 #endif

 #ifndef PNG_CALLBACK
-#  define PNG_CALLBACK(type, name, args, attributes)\
-   type (PNGCBAPI name) PNGARG(args) attributes
+#  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 #endif

 /* Support for compiler specific function attributes.  These are used
@@ -306,7 +337,7 @@
   * functions in png.h will generate compiler warnings.  Added at libpng
   * version 1.2.41.
   */
-#  ifdef __GNUC__
+#  if defined(__GNUC__)
 #    ifndef PNG_USE_RESULT
 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 #    endif
@@ -316,29 +347,39 @@
 #    ifndef PNG_ALLOCATED
 #      define PNG_ALLOCATED  __attribute__((__malloc__))
 #    endif
-
-    /* This specifically protects structure members that should only be
-     * accessed from within the library, therefore should be empty during
-     * a library build.
-     */
-#    ifndef PNGLIB_BUILD
-#      ifndef PNG_DEPRECATED
-#        define PNG_DEPRECATED __attribute__((__deprecated__))
+#    ifndef PNG_DEPRECATED
+#      define PNG_DEPRECATED __attribute__((__deprecated__))
+#    endif
+#    ifndef PNG_PRIVATE
+#      if 0 /* Doesn't work so we use deprecated instead*/
+#        define PNG_PRIVATE \
+          __attribute__((warning("This function is not exported by libpng.")))
+#      else
+#        define PNG_PRIVATE \
+          __attribute__((__deprecated__))
 #      endif
-#      ifndef PNG_DEPSTRUCT
-#        define PNG_DEPSTRUCT  __attribute__((__deprecated__))
-#      endif
-#      ifndef PNG_PRIVATE
-#        if 0 /* Doesn't work so we use deprecated instead*/
-#          define PNG_PRIVATE \
-            __attribute__((warning("This function is not exported by libpng.")))
-#        else
-#          define PNG_PRIVATE \
-            __attribute__((__deprecated__))
-#        endif
-#      endif /* PNG_PRIVATE */
-#    endif /* PNGLIB_BUILD */
+#    endif
 #  endif /* __GNUC__ */
+
+#  if defined(_MSC_VER)  && (_MSC_VER >= 1300)
+#    ifndef PNG_USE_RESULT
+#      define PNG_USE_RESULT /* not supported */
+#    endif
+#    ifndef PNG_NORETURN
+#      define PNG_NORETURN __declspec(noreturn)
+#    endif
+#    ifndef PNG_ALLOCATED
+#      if (_MSC_VER >= 1400)
+#        define PNG_ALLOCATED __declspec(restrict)
+#      endif
+#    endif
+#    ifndef PNG_DEPRECATED
+#      define PNG_DEPRECATED __declspec(deprecated)
+#    endif
+#    ifndef PNG_PRIVATE
+#      define PNG_PRIVATE __declspec(deprecated)
+#    endif
+#  endif /* _MSC_VER */
 #endif /* PNG_PEDANTIC_WARNINGS */

 #ifndef PNG_DEPRECATED
@@ -353,12 +394,25 @@
 #ifndef PNG_ALLOCATED
 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 #endif
-#ifndef PNG_DEPSTRUCT
-#  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
-#endif
 #ifndef PNG_PRIVATE
 #  define PNG_PRIVATE     /* This is a private libpng function */
 #endif
+#ifndef PNG_FP_EXPORT     /* A floating point API. */
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+#     define PNG_FP_EXPORT(ordinal, type, name, args)\
+         PNG_EXPORT(ordinal, type, name, args)
+#  else                   /* No floating point APIs */
+#     define PNG_FP_EXPORT(ordinal, type, name, args)
+#  endif
+#endif
+#ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+#     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
+         PNG_EXPORT(ordinal, type, name, args)
+#  else                   /* No fixed point APIs */
+#     define PNG_FIXED_EXPORT(ordinal, type, name, args)
+#  endif
+#endif

 /* The following uses const char * instead of char * for error
 * and warning message functions, so some compilers won't complain.
@@ -399,7 +453,7 @@ typedef unsigned int png_size_t;
 #else
 typedef size_t png_size_t;
 #endif
-#define png_sizeof(x) sizeof(x)
+#define png_sizeof(x) (sizeof (x))

 /* The following is needed for medium model support.  It cannot be in the
 * pngpriv.h header.  Needs modification for other compilers besides
@@ -462,27 +516,37 @@ typedef size_t png_size_t;
 #endif

 /* Typedef for floating-point numbers that are converted
- * to fixed-point with a multiple of 100,000, e.g., int_gamma
+ * to fixed-point with a multiple of 100,000, e.g., gamma
 */
 typedef png_int_32 png_fixed_point;

 /* Add typedefs for pointers */
-typedef void            FAR * png_voidp;
-typedef png_byte        FAR * png_bytep;
-typedef png_uint_32     FAR * png_uint_32p;
-typedef png_int_32      FAR * png_int_32p;
-typedef png_uint_16     FAR * png_uint_16p;
-typedef png_int_16      FAR * png_int_16p;
-typedef PNG_CONST char  FAR * png_const_charp;
-typedef char            FAR * png_charp;
-typedef png_fixed_point FAR * png_fixed_point_p;
+typedef void                      FAR * png_voidp;
+typedef PNG_CONST void            FAR * png_const_voidp;
+typedef png_byte                  FAR * png_bytep;
+typedef PNG_CONST png_byte        FAR * png_const_bytep;
+typedef png_uint_32               FAR * png_uint_32p;
+typedef PNG_CONST png_uint_32     FAR * png_const_uint_32p;
+typedef png_int_32                FAR * png_int_32p;
+typedef PNG_CONST png_int_32      FAR * png_const_int_32p;
+typedef png_uint_16               FAR * png_uint_16p;
+typedef PNG_CONST png_uint_16     FAR * png_const_uint_16p;
+typedef png_int_16                FAR * png_int_16p;
+typedef PNG_CONST png_int_16      FAR * png_const_int_16p;
+typedef char                      FAR * png_charp;
+typedef PNG_CONST char            FAR * png_const_charp;
+typedef png_fixed_point           FAR * png_fixed_point_p;
+typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;
+typedef png_size_t                FAR * png_size_tp;
+typedef PNG_CONST png_size_t      FAR * png_const_size_tp;

 #ifdef PNG_STDIO_SUPPORTED
 typedef FILE            * png_FILE_p;
 #endif

 #ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double          FAR * png_doublep;
+typedef double           FAR * png_doublep;
+typedef PNG_CONST double FAR * png_const_doublep;
 #endif

 /* Pointers to pointers; i.e. arrays */
@@ -501,80 +565,6 @@ typedef double          FAR * FAR * png_doublepp;
 /* Pointers to pointers to pointers; i.e., pointer to array */
 typedef char            FAR * FAR * FAR * png_charppp;

-#define PNG_USE_LOCAL_ARRAYS /* Not used in libpng, defined for legacy apps */
-
-/* Users may want to use these so they are not private.  Any library
- * functions that are passed far data must be model-independent.
- */
-
-/* Memory model/platform independent fns */
-#ifndef PNG_ABORT
-#  ifdef _WINDOWS_
-#    define PNG_ABORT() ExitProcess(0)
-#  else
-#    define PNG_ABORT() abort()
-#  endif
-#endif
-
-#ifdef USE_FAR_KEYWORD
-/* Use this to make far-to-near assignments */
-#  define CHECK   1
-#  define NOCHECK 0
-#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
-#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
-#  define png_strcpy  _fstrcpy
-#  define png_strncpy _fstrncpy   /* Added to v 1.2.6 */
-#  define png_strlen  _fstrlen
-#  define png_memcmp  _fmemcmp    /* SJT: added */
-#  define png_memcpy  _fmemcpy
-#  define png_memset  _fmemset
-#  define png_sprintf sprintf
-#else
-#  ifdef _WINDOWS_  /* Favor Windows over C runtime fns */
-#    define CVT_PTR(ptr)         (ptr)
-#    define CVT_PTR_NOCHECK(ptr) (ptr)
-#    define png_strcpy  lstrcpyA
-#    define png_strncpy lstrcpynA
-#    define png_strlen  lstrlenA
-#    define png_memcmp  memcmp
-#    define png_memcpy  CopyMemory
-#    define png_memset  memset
-#    define png_sprintf wsprintfA
-#  else
-#    define CVT_PTR(ptr)         (ptr)
-#    define CVT_PTR_NOCHECK(ptr) (ptr)
-#    define png_strcpy  strcpy
-#    define png_strncpy strncpy     /* Added to v 1.2.6 */
-#    define png_strlen  strlen
-#    define png_memcmp  memcmp      /* SJT: added */
-#    define png_memcpy  memcpy
-#    define png_memset  memset
-#    define png_sprintf sprintf
-#    ifndef PNG_NO_SNPRINTF
-#      ifdef _MSC_VER
-#        define png_snprintf _snprintf   /* Added to v 1.2.19 */
-#        define png_snprintf2 _snprintf
-#        define png_snprintf6 _snprintf
-#      else
-#        define png_snprintf snprintf   /* Added to v 1.2.19 */
-#        define png_snprintf2 snprintf
-#        define png_snprintf6 snprintf
-#      endif
-#    else
-      /* You don't have or don't want to use snprintf().  Caution: Using
-       * sprintf instead of snprintf exposes your application to accidental
-       * or malevolent buffer overflows.  If you don't have snprintf()
-       * as a general rule you should provide one (you can get one from
-       * Portable OpenSSH).
-       */
-#      define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
-#      define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
-#      define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
-          sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
-#    endif
-#  endif
-#endif
-
 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
 * and no smaller than png_uint_32.  Casts from png_size_t or png_uint_32
 * to png_alloc_size_t are not necessary; in fact, it is recommended
@@ -585,26 +575,22 @@ typedef char            FAR * FAR * FAR * png_charppp;
 * to encounter practical situations that require such conversions.
 */
 #if defined(__TURBOC__) && !defined(__FLAT__)
-#  define png_mem_alloc farmalloc
-#  define png_mem_free  farfree
   typedef unsigned long png_alloc_size_t;
 #else
 #  if defined(_MSC_VER) && defined(MAXSEG_64K)
-#    define png_mem_alloc(s) halloc(s, 1)
-#    define png_mem_free     hfree
     typedef unsigned long    png_alloc_size_t;
 #  else
-#    if defined(_WINDOWS_) && (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
-#      define png_mem_alloc(s) HeapAlloc(GetProcessHeap(), 0, s)
-#      define png_mem_free(p)  HeapFree(GetProcessHeap(), 0, p)
-       typedef DWORD            png_alloc_size_t;
+     /* This is an attempt to detect an old Windows system where (int) is
+      * actually 16 bits, in that case png_malloc must have an argument with a
+      * bigger size to accomodate the requirements of the library.
+      */
+#    if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
+        (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
+       typedef DWORD         png_alloc_size_t;
 #    else
-#      define png_mem_alloc malloc
-#      define png_mem_free  free
       typedef png_size_t    png_alloc_size_t;
 #    endif
 #  endif
 #endif
-/* End of memory model/platform independent support */

 #endif /* PNGCONF_H */
--- a/pngdebug.h
+++ b/pngdebug.h
@@ -1,11 +1,11 @@

 /* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 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.)
 *
- * Last changed in libpng version 1.5.0 - April 18, 2010
+ * Last changed in libpng 1.5.0 [January 6, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -26,7 +26,7 @@
 *
 *   level: level of detail of message, starting at 0.  A level 'n'
 *          message is preceded by 'n' tab characters (not implemented
- *          on Microsoft compilers unless PNG_DEBUG_FILE is also 
+ *          on Microsoft compilers unless PNG_DEBUG_FILE is also
 *          defined, to allow debug DLL compilation with no standard IO).
 *   message: a printf(3) style text string.  A trailing '\n' is added
 *            to the message.
@@ -34,7 +34,7 @@
 */
 #ifndef PNGDEBUG_H
 #define PNGDEBUG_H
-/* These settings control the formatting of messages in pngerror.c */
+/* These settings control the formatting of messages in png.c and pngerror.c */
 /* Moved to pngdebug.h at 1.5.0 */
 #  ifndef PNG_LITERAL_SHARP
 #    define PNG_LITERAL_SHARP 0x23
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,8 +1,8 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -20,13 +20,13 @@

 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

-static void /* PRIVATE */
-png_default_error PNGARG((png_structp png_ptr,
-    png_const_charp error_message)) PNG_NORETURN;
+static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr,
+    png_const_charp error_message)),PNG_NORETURN);
+
 #ifdef PNG_WARNINGS_SUPPORTED
 static void /* PRIVATE */
 png_default_warning PNGARG((png_structp png_ptr,
-  png_const_charp warning_message));
+   png_const_charp warning_message));
 #endif /* PNG_WARNINGS_SUPPORTED */

 /* This function is called whenever there is a fatal error.  This function
@@ -35,42 +35,45 @@ png_default_warning PNGARG((png_structp png_ptr,
 * to replace the error function at run-time.
 */
 #ifdef PNG_ERROR_TEXT_SUPPORTED
-void PNGAPI
-png_error(png_structp png_ptr, png_const_charp error_message)
+PNG_FUNCTION(void,PNGAPI
+png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN)
 {
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
   char msg[16];
   if (png_ptr != NULL)
   {
-     if (png_ptr->flags&
+      if (png_ptr->flags&
         (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
-     {
-       if (*error_message == PNG_LITERAL_SHARP)
-       {
-           /* Strip "#nnnn " from beginning of error message. */
-           int offset;
-           for (offset = 1; offset<15; offset++)
-              if (error_message[offset] == ' ')
+      {
+         if (*error_message == PNG_LITERAL_SHARP)
+         {
+            /* Strip "#nnnn " from beginning of error message. */
+            int offset;
+            for (offset = 1; offset<15; offset++)
+               if (error_message[offset] == ' ')
                  break;
-           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
-           {
-              int i;
-              for (i = 0; i < offset - 1; i++)
-                 msg[i] = error_message[i + 1];
-              msg[i - 1] = '\0';
-              error_message = msg;
-           }
-           else
-              error_message += offset;
-       }
-       else
-       {
-           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
-           {
-              msg[0] = '0';
-              msg[1] = '\0';
-              error_message = msg;
-           }
+
+            if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+            {
+               int i;
+               for (i = 0; i < offset - 1; i++)
+                  msg[i] = error_message[i + 1];
+               msg[i - 1] = '\0';
+               error_message = msg;
+            }
+
+            else
+               error_message += offset;
+      }
+
+      else
+      {
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            msg[0] = '0';
+            msg[1] = '\0';
+            error_message = msg;
+         }
       }
     }
   }
@@ -83,18 +86,124 @@ png_error(png_structp png_ptr, png_const_charp error_message)
   png_default_error(png_ptr, error_message);
 }
 #else
-void PNGAPI
-png_err(png_structp png_ptr)
+PNG_FUNCTION(void,PNGAPI
+png_err,(png_structp png_ptr),PNG_NORETURN)
 {
+   /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
+    * erroneously as '\0', instead of the empty string "".  This was
+    * apparently an error, introduced in libpng-1.2.20, and png_default_error
+    * will crash in this case.
+    */
   if (png_ptr != NULL && png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_ptr, '\0');
+      (*(png_ptr->error_fn))(png_ptr, "");

   /* If the custom handler doesn't exist, or if it returns,
      use the default handler, which will not return. */
-   png_default_error(png_ptr, '\0');
+   png_default_error(png_ptr, "");
 }
 #endif /* PNG_ERROR_TEXT_SUPPORTED */

+/* Utility to safely appends strings to a buffer.  This never errors out so
+ * error checking is not required in the caller.
+ */
+size_t
+png_safecat(png_charp buffer, size_t bufsize, size_t pos,
+   png_const_charp string)
+{
+   if (buffer != NULL && pos < bufsize)
+   {
+      if (string != NULL)
+         while (*string != '\0' && pos < bufsize-1)
+           buffer[pos++] = *string++;
+
+      buffer[pos] = '\0';
+   }
+
+   return pos;
+}
+
+#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
+/* Utility to dump an unsigned value into a buffer, given a start pointer and
+ * and end pointer (which should point just *beyond* the end of the buffer!)
+ * Returns the pointer to the start of the formatted string.
+ */
+png_charp
+png_format_number(png_const_charp start, png_charp end, int format,
+   png_alloc_size_t number)
+{
+   int count = 0;    /* number of digits output */
+   int mincount = 1; /* minimum number required */
+   int output = 0;   /* digit output (for the fixed point format) */
+
+   *--end = '\0';
+
+   /* This is written so that the loop always runs at least once, even with
+    * number zero.
+    */
+   while (end > start && (number != 0 || count < mincount))
+   {
+
+      static const char digits[] = "0123456789ABCDEF";
+
+      switch (format)
+      {
+         case PNG_NUMBER_FORMAT_fixed:
+            /* Needs five digits (the fraction) */
+            mincount = 5;
+            if (output || number % 10 != 0)
+            {
+               *--end = digits[number % 10];
+               output = 1;
+            }
+            number /= 10;
+            break;
+
+         case PNG_NUMBER_FORMAT_02u:
+            /* Expects at least 2 digits. */
+            mincount = 2;
+            /* fall through */
+
+         case PNG_NUMBER_FORMAT_u:
+            *--end = digits[number % 10];
+            number /= 10;
+            break;
+
+         case PNG_NUMBER_FORMAT_02x:
+            /* This format expects at least two digits */
+            mincount = 2;
+            /* fall through */
+
+         case PNG_NUMBER_FORMAT_x:
+            *--end = digits[number & 0xf];
+            number >>= 4;
+            break;
+
+         default: /* an error */
+            number = 0;
+            break;
+      }
+
+      /* Keep track of the number of digits added */
+      ++count;
+
+      /* Float a fixed number here: */
+      if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start)
+      {
+         /* End of the fraction, but maybe nothing was output?  In that case
+          * drop the decimal point.  If the number is a true zero handle that
+          * here.
+          */
+         if (output)
+            *--end = '.';
+         else if (number == 0) /* and !output */
+            *--end = '0';
+      }
+   }
+
+   return end;
+}
+#endif
+
 #ifdef PNG_WARNINGS_SUPPORTED
 /* This function is called whenever there is a non-fatal error.  This function
 * should not be changed.  If there is a need to handle warnings differently,
@@ -125,6 +234,115 @@ png_warning(png_structp png_ptr, png_const_charp warning_message)
   else
      png_default_warning(png_ptr, warning_message + offset);
 }
+
+/* These functions support 'formatted' warning messages with up to
+ * PNG_WARNING_PARAMETER_COUNT parameters.  In the format string the parameter
+ * is introduced by @<number>, where 'number' starts at 1.  This follows the
+ * standard established by X/Open for internationalizable error messages.
+ */
+void
+png_warning_parameter(png_warning_parameters p, int number,
+   png_const_charp string)
+{
+   if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
+      (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
+}
+
+void
+png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
+   png_alloc_size_t value)
+{
+   char buffer[PNG_NUMBER_BUFFER_SIZE];
+   png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
+}
+
+void
+png_warning_parameter_signed(png_warning_parameters p, int number, int format,
+   png_int_32 value)
+{
+   png_alloc_size_t u;
+   png_charp str;
+   char buffer[PNG_NUMBER_BUFFER_SIZE];
+
+   /* Avoid overflow by doing the negate in a png_alloc_size_t: */
+   u = (png_alloc_size_t)value;
+   if (value < 0)
+      u = ~u + 1;
+
+   str = PNG_FORMAT_NUMBER(buffer, format, u);
+
+   if (value < 0 && str > buffer)
+      *--str = '-';
+
+   png_warning_parameter(p, number, str);
+}
+
+void
+png_formatted_warning(png_structp png_ptr, png_warning_parameters p,
+   png_const_charp message)
+{
+   /* The internal buffer is just 128 bytes - enough for all our messages,
+    * overflow doesn't happen because this code checks!
+    */
+   size_t i;
+   char msg[128];
+
+   for (i=0; i<(sizeof msg)-1 && *message != '\0'; ++i)
+   {
+      if (*message == '@')
+      {
+         int parameter = -1;
+         switch (*++message)
+         {
+            case '1':
+               parameter = 0;
+               break;
+
+            case '2':
+               parameter = 1;
+               break;
+
+            case '\0':
+               continue; /* To break out of the for loop above. */
+
+            default:
+               break;
+         }
+
+         if (parameter >= 0 && parameter < PNG_WARNING_PARAMETER_COUNT)
+         {
+            /* Append this parameter */
+            png_const_charp parm = p[parameter];
+            png_const_charp pend = p[parameter] + (sizeof p[parameter]);
+
+            /* No need to copy the trailing '\0' here, but there is no guarantee
+             * that parm[] has been initialized, so there is no guarantee of a
+             * trailing '\0':
+             */
+            for (; i<(sizeof msg)-1 && parm != '\0' && parm < pend; ++i)
+               msg[i] = *parm++;
+
+            ++message;
+            continue;
+         }
+
+         /* else not a parameter and there is a character after the @ sign; just
+          * copy that.
+          */
+      }
+
+      /* At this point *message can't be '\0', even in the bad parameter case
+       * above where there is a lone '@' at the end of the message string.
+       */
+      msg[i] = *message++;
+   }
+
+   /* i is always less than (sizeof msg), so: */
+   msg[i] = '\0';
+
+   /* And this is the formatted message: */
+   png_warning(png_ptr, msg);
+}
 #endif /* PNG_WARNINGS_SUPPORTED */

 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
@@ -156,11 +374,14 @@ static void /* PRIVATE */
 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
    error_message)
 {
-   int iout = 0, iin = 0;
+   png_uint_32 chunk_name = png_ptr->chunk_name;
+   int iout = 0, ishift = 24;

-   while (iin < 4)
+   while (ishift >= 0)
   {
-      int c = png_ptr->chunk_name[iin++];
+      int c = (int)(chunk_name >> ishift) & 0xff;
+
+      ishift -= 8;
      if (isnonalpha(c))
      {
         buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
@@ -168,31 +389,41 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
         buffer[iout++] = png_digit[c & 0x0f];
         buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
      }
+
      else
      {
-         buffer[iout++] = (png_byte)c;
+         buffer[iout++] = (char)c;
      }
   }

   if (error_message == NULL)
      buffer[iout] = '\0';
+
   else
   {
+      int iin = 0;
+
      buffer[iout++] = ':';
      buffer[iout++] = ' ';
-      png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
-      buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
+
+      while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
+         buffer[iout++] = error_message[iin++];
+
+      /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
+      buffer[iout] = '\0';
   }
 }
 #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */

 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
-void PNGAPI
-png_chunk_error(png_structp png_ptr, png_const_charp error_message)
+PNG_FUNCTION(void,PNGAPI
+png_chunk_error,(png_structp png_ptr, png_const_charp error_message),
+   PNG_NORETURN)
 {
   char msg[18+PNG_MAX_ERROR_TEXT];
   if (png_ptr == NULL)
      png_error(png_ptr, error_message);
+
   else
   {
      png_format_buffer(png_ptr, msg, error_message);
@@ -208,6 +439,7 @@ png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
   char msg[18+PNG_MAX_ERROR_TEXT];
   if (png_ptr == NULL)
      png_warning(png_ptr, warning_message);
+
   else
   {
      png_format_buffer(png_ptr, msg, warning_message);
@@ -223,12 +455,35 @@ png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message)
 {
   if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
      png_chunk_warning(png_ptr, error_message);
+
   else
      png_chunk_error(png_ptr, error_message);
 }
 #endif
 #endif /* PNG_READ_SUPPORTED */

+#ifdef PNG_ERROR_TEXT_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_FUNCTION(void,
+png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN)
+{
+#  define fixed_message "fixed point overflow in "
+#  define fixed_message_ln ((sizeof fixed_message)-1)
+   int  iin;
+   char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
+   png_memcpy(msg, fixed_message, fixed_message_ln);
+   iin = 0;
+   if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
+   {
+      msg[fixed_message_ln + iin] = name[iin];
+      ++iin;
+   }
+   msg[fixed_message_ln + iin] = 0;
+   png_error(png_ptr, msg);
+}
+#endif
+#endif
+
 #ifdef PNG_SETJMP_SUPPORTED
 /* This API only exists if ANSI-C style error handling is used,
 * otherwise it is necessary for png_default_error to be overridden.
@@ -241,7 +496,7 @@ png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn,
      return NULL;

   png_ptr->longjmp_fn = longjmp_fn;
-   return &png_ptr->png_jmpbuf;
+   return &png_ptr->longjmp_buffer;
 }
 #endif

@@ -250,12 +505,14 @@ png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn,
 * function is used by default, or if the program supplies NULL for the
 * error function pointer in png_set_error_fn().
 */
-static void /* PRIVATE */
-png_default_error(png_structp png_ptr, png_const_charp error_message)
+static PNG_FUNCTION(void /* PRIVATE */,
+png_default_error,(png_structp png_ptr, png_const_charp error_message),
+   PNG_NORETURN)
 {
 #ifdef PNG_CONSOLE_IO_SUPPORTED
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (*error_message == PNG_LITERAL_SHARP)
+   /* Check on NULL only added in 1.5.4 */
+   if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
   {
      /* Strip "#nnnn " from beginning of error message. */
      int offset;
@@ -266,6 +523,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
         if (error_message[offset] == ' ')
            break;
      }
+
      if ((offset > 1) && (offset < 15))
      {
         error_number[offset - 1] = '\0';
@@ -273,6 +531,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
             error_number, error_message + offset + 1);
         fprintf(stderr, PNG_STRING_NEWLINE);
      }
+
      else
      {
         fprintf(stderr, "libpng error: %s, offset=%d",
@@ -283,30 +542,31 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
   else
 #endif
   {
-      fprintf(stderr, "libpng error: %s", error_message);
+      fprintf(stderr, "libpng error: %s", error_message ? error_message :
+         "undefined");
      fprintf(stderr, PNG_STRING_NEWLINE);
   }
+#else
+   PNG_UNUSED(error_message) /* Make compiler happy */
 #endif
   png_longjmp(png_ptr, 1);
-#ifndef PNG_CONSOLE_IO_SUPPORTED
-   error_message = error_message; /* Make compiler happy */
-#endif
 }

-void PNGAPI
-png_longjmp(png_structp png_ptr, int val)
+PNG_FUNCTION(void,PNGAPI
+png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN)
 {
 #ifdef PNG_SETJMP_SUPPORTED
   if (png_ptr && png_ptr->longjmp_fn)
   {
 #  ifdef USE_FAR_KEYWORD
-   {
-      jmp_buf png_jmpbuf;
-      png_memcpy(png_jmpbuf, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
-     png_ptr->longjmp_fn(png_jmpbuf, val);
-   }
+      {
+         jmp_buf tmp_jmpbuf;
+         png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
+         png_ptr->longjmp_fn(tmp_jmpbuf, val);
+      }
+
 #  else
-   png_ptr->longjmp_fn(png_ptr->png_jmpbuf, val);
+   png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val);
 #  endif
   }
 #endif
@@ -335,6 +595,7 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
         if (warning_message[offset] == ' ')
            break;
      }
+
      if ((offset > 1) && (offset < 15))
      {
         warning_number[offset + 1] = '\0';
@@ -342,6 +603,7 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
             warning_number, warning_message + offset);
         fprintf(stderr, PNG_STRING_NEWLINE);
      }
+
      else
      {
         fprintf(stderr, "libpng warning: %s",
@@ -351,21 +613,22 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
   }
   else
 #  endif
+
   {
      fprintf(stderr, "libpng warning: %s", warning_message);
      fprintf(stderr, PNG_STRING_NEWLINE);
   }
 #else
-   warning_message = warning_message; /* Make compiler happy */
+   PNG_UNUSED(warning_message) /* Make compiler happy */
 #endif
-   png_ptr = png_ptr; /* Make compiler happy */
+   PNG_UNUSED(png_ptr) /* Make compiler happy */
 }
 #endif /* PNG_WARNINGS_SUPPORTED */

 /* This function is called when the application wants to use another method
 * of handling errors and warnings.  Note that the error function MUST NOT
 * return to the calling routine or serious problems will occur.  The return
- * method used in the default routine calls longjmp(png_ptr->png_jmpbuf, 1)
+ * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1)
 */
 void PNGAPI
 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
@@ -373,9 +636,14 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 {
   if (png_ptr == NULL)
      return;
+
   png_ptr->error_ptr = error_ptr;
   png_ptr->error_fn = error_fn;
+#ifdef PNG_WARNINGS_SUPPORTED
   png_ptr->warning_fn = warning_fn;
+#else
+   PNG_UNUSED(warning_fn)
+#endif
 }


@@ -384,10 +652,11 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_error_ptr(png_structp png_ptr)
+png_get_error_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return NULL;
+
   return ((png_voidp)png_ptr->error_ptr);
 }

--- a/pngget.c
+++ b/pngget.c
--- a/pnginfo.h
+++ b/pnginfo.h
@@ -1,11 +1,11 @@

 /* pnginfo.h - header file for PNG reference library
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 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.)
 *
- * Last changed in libpng version 1.5.0 - April 18, 2010
+ * Last changed in libpng 1.5.0 [January 6, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -82,12 +82,12 @@ struct png_info_def
    * and initialize the appropriate fields below.
    */

-#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
   /* The gAMA chunk describes the gamma characteristics of the system
    * on which the image was created, normally in the range [1.0, 2.5].
    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
    */
-   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
+   png_fixed_point gamma;
 #endif

 #ifdef PNG_sRGB_SUPPORTED
@@ -138,7 +138,6 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    * single color specified that should be treated as fully transparent.
    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
    */
-   png_bytep trans;    /* alpha values for paletted image */
   png_bytep trans_alpha;    /* alpha values for paletted image */
   png_color_16 trans_color; /* transparent color for non-palette image */
 #endif
@@ -191,16 +190,14 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    * colors in the image as the creator.  Values are in the range
    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
    */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float x_white;
-   float y_white;
-   float x_red;
-   float y_red;
-   float x_green;
-   float y_green;
-   float x_blue;
-   float y_blue;
-#endif
+   png_fixed_point x_white;
+   png_fixed_point y_white;
+   png_fixed_point x_red;
+   png_fixed_point y_red;
+   png_fixed_point x_green;
+   png_fixed_point y_green;
+   png_fixed_point x_blue;
+   png_fixed_point y_blue;
 #endif

 #ifdef PNG_pCAL_SUPPORTED
@@ -231,14 +228,13 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
   /* Storage for unknown chunks that the library doesn't recognize. */
   png_unknown_chunkp unknown_chunks;
-   png_size_t unknown_chunks_num;
+   int unknown_chunks_num;
 #endif

 #ifdef PNG_iCCP_SUPPORTED
   /* iCCP chunk data. */
   png_charp iccp_name;     /* profile name */
-   png_charp iccp_profile;  /* International Color Consortium profile data */
-                            /* Note to maintainer: should be png_bytep */
+   png_bytep iccp_profile;  /* International Color Consortium profile data */
   png_uint_32 iccp_proflen;  /* ICC profile data length */
   png_byte iccp_compression; /* Always zero */
 #endif
@@ -254,19 +250,13 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    * subject matter of the graphic.  The chunk contains a unit specification
    * a byte value, and two ASCII strings representing floating-point
    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  This external representation is converted to double
-    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
+    * in the image.  Data values are valid if (valid & PNG_INFO_sCAL) is
+    * non-zero.
    */
   png_byte scal_unit;         /* unit of physical scale */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   double scal_pixel_width;    /* width of one pixel */
-   double scal_pixel_height;   /* height of one pixel */
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
   png_charp scal_s_width;     /* string containing height */
   png_charp scal_s_height;    /* string containing width */
 #endif
-#endif

 #ifdef PNG_INFO_IMAGE_SUPPORTED
   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
@@ -275,20 +265,5 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
   png_bytepp row_pointers;        /* the image bits */
 #endif

-#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
-   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
-   png_fixed_point int_x_white;
-   png_fixed_point int_y_white;
-   png_fixed_point int_x_red;
-   png_fixed_point int_y_red;
-   png_fixed_point int_x_green;
-   png_fixed_point int_y_green;
-   png_fixed_point int_x_blue;
-   png_fixed_point int_y_blue;
-#endif
-
 };
 #endif /* PNGINFO_H */
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,8 +1,8 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -27,16 +27,17 @@

 /* 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 /* PRIVATE */
-png_create_struct(int type)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
 {
 #  ifdef PNG_USER_MEM_SUPPORTED
   return (png_create_struct_2(type, NULL, NULL));
 }

 /* Alternate version of png_create_struct, for use with user-defined malloc. */
-png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
 {
 #  endif /* PNG_USER_MEM_SUPPORTED */
   png_size_t size;
@@ -44,8 +45,10 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)

   if (type == PNG_STRUCT_INFO)
      size = png_sizeof(png_info);
+
   else if (type == PNG_STRUCT_PNG)
      size = png_sizeof(png_struct);
+
   else
      return (png_get_copyright(NULL));

@@ -53,15 +56,17 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   if (malloc_fn != NULL)
   {
      png_struct dummy_struct;
-      png_structp png_ptr = &dummy_struct;
-      png_ptr->mem_ptr=mem_ptr;
-      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
+      memset(&dummy_struct, 0, sizeof dummy_struct);
+      dummy_struct.mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(&dummy_struct, (png_alloc_size_t)size);
   }
+
   else
 #  endif /* PNG_USER_MEM_SUPPORTED */
   struct_ptr = (png_voidp)farmalloc(size);
   if (struct_ptr != NULL)
      png_memset(struct_ptr, 0, size);
+
   return (struct_ptr);
 }

@@ -85,11 +90,12 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
      if (free_fn != NULL)
      {
         png_struct dummy_struct;
-         png_structp png_ptr = &dummy_struct;
-         png_ptr->mem_ptr=mem_ptr;
-         (*(free_fn))(png_ptr, struct_ptr);
+         memset(&dummy_struct, 0, sizeof dummy_struct);
+         dummy_struct.mem_ptr=mem_ptr;
+         (*(free_fn))(&dummy_struct, struct_ptr);
         return;
      }
+
 #  endif /* PNG_USER_MEM_SUPPORTED */
      farfree (struct_ptr);
   }
@@ -114,19 +120,21 @@ 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 PNGAPI
-png_calloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

   ret = (png_malloc(png_ptr, size));
+
   if (ret != NULL)
      png_memset(ret,0,(png_size_t)size);
+
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -135,16 +143,19 @@ png_malloc(png_structp png_ptr, png_alloc_size_t size)

 #  ifdef PNG_USER_MEM_SUPPORTED
   if (png_ptr->malloc_fn != NULL)
-      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+
   else
      ret = (png_malloc_default(png_ptr, size));
+
   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
       png_error(png_ptr, "Out of memory");
+
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;
 #  endif /* PNG_USER_MEM_SUPPORTED */
@@ -158,11 +169,13 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
      png_warning(png_ptr, "Cannot Allocate > 64K");
      ret = NULL;
   }
+
   else
 #  endif

   if (size != (size_t)size)
      ret = NULL;
+
   else if (size == (png_uint_32)65536L)
   {
      if (png_ptr->offset_table == NULL)
@@ -174,8 +187,9 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
            int num_blocks;
            png_uint_32 total_size;
            png_bytep table;
-            int i;
+            int i, mem_level, window_bits;
            png_byte huge * hptr;
+            int window_bits

            if (ret != NULL)
            {
@@ -183,12 +197,23 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
               ret = NULL;
            }

-            if (png_ptr->zlib_window_bits > 14)
-               num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
+            window_bits =
+                png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ?
+                png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits;
+
+            if (window_bits > 14)
+               num_blocks = (int)(1 << (window_bits - 14));
+
            else
               num_blocks = 1;
-            if (png_ptr->zlib_mem_level >= 7)
-               num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
+
+            mem_level =
+                png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ?
+                png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level;
+
+            if (mem_level >= 7)
+               num_blocks += (int)(1 << (mem_level - 7));
+
            else
               num_blocks++;

@@ -201,6 +226,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
 #  ifndef PNG_USER_MEM_SUPPORTED
               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
                  png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
+
               else
                  png_warning(png_ptr, "Out Of Memory");
 #  endif
@@ -213,6 +239,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
                  png_error(png_ptr,
                    "Farmalloc didn't return normalized pointer");
+
               else
                  png_warning(png_ptr,
                    "Farmalloc didn't return normalized pointer");
@@ -229,6 +256,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
 #  ifndef PNG_USER_MEM_SUPPORTED
               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
                  png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
+
               else
                  png_warning(png_ptr, "Out Of memory");
 #  endif
@@ -241,6 +269,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
               hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
               hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
            }
+
            for (i = 0; i < num_blocks; i++)
            {
               png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
@@ -257,7 +286,8 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
      {
 #  ifndef PNG_USER_MEM_SUPPORTED
         if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-            png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
+            png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */
+
         else
            png_warning(png_ptr, "Out of Memory");
 #  endif
@@ -266,6 +296,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)

      ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
   }
+
   else
      ret = farmalloc(size);

@@ -274,6 +305,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
   {
      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
         png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
+
      else
         png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
   }
@@ -298,6 +330,7 @@ png_free(png_structp png_ptr, png_voidp ptr)
      (*(png_ptr->free_fn))(png_ptr, ptr);
      return;
   }
+
   else
      png_free_default(png_ptr, ptr);
 }
@@ -333,9 +366,7 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
   }

   if (ptr != NULL)
-   {
      farfree(ptr);
-   }
 }

 #else /* Not the Borland DOS special memory handler */
@@ -343,8 +374,8 @@ 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 /* PRIVATE */
-png_create_struct(int type)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
 {
 #  ifdef PNG_USER_MEM_SUPPORTED
   return (png_create_struct_2(type, NULL, NULL));
@@ -353,8 +384,9 @@ png_create_struct(int type)
 /* 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 /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
 {
 #  endif /* PNG_USER_MEM_SUPPORTED */
   png_size_t size;
@@ -362,8 +394,10 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)

   if (type == PNG_STRUCT_INFO)
      size = png_sizeof(png_info);
+
   else if (type == PNG_STRUCT_PNG)
      size = png_sizeof(png_struct);
+
   else
      return (NULL);

@@ -374,8 +408,10 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
      png_structp png_ptr = &dummy_struct;
      png_ptr->mem_ptr=mem_ptr;
      struct_ptr = (*(malloc_fn))(png_ptr, size);
+
      if (struct_ptr != NULL)
         png_memset(struct_ptr, 0, size);
+
      return (struct_ptr);
   }
 #  endif /* PNG_USER_MEM_SUPPORTED */
@@ -389,6 +425,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
   struct_ptr = (png_voidp)malloc(size);
 #    endif
 #  endif
+
   if (struct_ptr != NULL)
      png_memset(struct_ptr, 0, size);

@@ -424,11 +461,14 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 #  endif /* PNG_USER_MEM_SUPPORTED */
 #  if defined(__TURBOC__) && !defined(__FLAT__)
      farfree(struct_ptr);
+
 #  else
 #    if defined(_MSC_VER) && defined(MAXSEG_64K)
      hfree(struct_ptr);
+
 #    else
      free(struct_ptr);
+
 #    endif
 #  endif
   }
@@ -441,19 +481,21 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 * have the ability to do that.
 */

-png_voidp PNGAPI
-png_calloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

   ret = (png_malloc(png_ptr, size));
+
   if (ret != NULL)
      png_memset(ret,0,(png_size_t)size);
+
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;

@@ -463,15 +505,18 @@ png_malloc(png_structp png_ptr, png_alloc_size_t size)

   if (png_ptr->malloc_fn != NULL)
      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+
   else
      ret = (png_malloc_default(png_ptr, size));
+
   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
       png_error(png_ptr, "Out of Memory");
+
   return (ret);
 }

-png_voidp PNGAPI
-png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ret;
 #  endif /* PNG_USER_MEM_SUPPORTED */
@@ -485,6 +530,7 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)
 #    ifndef PNG_USER_MEM_SUPPORTED
      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
         png_error(png_ptr, "Cannot Allocate > 64K");
+
      else
 #    endif
         return NULL;
@@ -493,19 +539,25 @@ png_malloc_default(png_structp png_ptr, png_alloc_size_t size)

   /* Check for overflow */
 #  if defined(__TURBOC__) && !defined(__FLAT__)
+
   if (size != (unsigned long)size)
      ret = NULL;
+
   else
      ret = farmalloc(size);
+
 #  else
 #    if defined(_MSC_VER) && defined(MAXSEG_64K)
   if (size != (unsigned long)size)
      ret = NULL;
+
   else
      ret = halloc(size, 1);
+
 #    else
   if (size != (size_t)size)
      ret = NULL;
+
   else
      ret = malloc((size_t)size);
 #    endif
@@ -534,9 +586,11 @@ png_free(png_structp png_ptr, png_voidp ptr)
      (*(png_ptr->free_fn))(png_ptr, ptr);
      return;
   }
+
   else
      png_free_default(png_ptr, ptr);
 }
+
 void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
 {
@@ -547,15 +601,17 @@ png_free_default(png_structp png_ptr, png_voidp ptr)

 #  if defined(__TURBOC__) && !defined(__FLAT__)
   farfree(ptr);
+
 #  else
 #    if defined(_MSC_VER) && defined(MAXSEG_64K)
   hfree(ptr);
+
 #    else
   free(ptr);
+
 #    endif
 #  endif
 }
-
 #endif /* Not Borland DOS special memory handler */

 /* This function was added at libpng version 1.2.3.  The png_malloc_warn()
@@ -563,8 +619,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 * instead of issuing a png_error, if it fails to allocate the requested
 * memory.
 */
-png_voidp PNGAPI
-png_malloc_warn(png_structp png_ptr, png_alloc_size_t size)
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
 {
   png_voidp ptr;
   png_uint_32 save_flags;
@@ -600,10 +656,11 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_mem_ptr(png_structp png_ptr)
+png_get_mem_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
+
   return ((png_voidp)png_ptr->mem_ptr);
 }
 #endif /* PNG_USER_MEM_SUPPORTED */
--- a/pngpread.c
+++ b/pngpread.c
--- a/pngpriv.h
+++ b/pngpriv.h
--- a/pngread.c
+++ b/pngread.c
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,8 +1,8 @@

 /* pngrio.c - functions for data input
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -32,9 +32,10 @@ void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
   png_debug1(4, "reading %d bytes", (int)length);
- 
+
   if (png_ptr->read_data_fn != NULL)
      (*(png_ptr->read_data_fn))(png_ptr, data, length);
+
   else
      png_error(png_ptr, "Call to NULL read function");
 }
@@ -53,6 +54,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   if (png_ptr == NULL)
      return;
+
   /* 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.
    */
@@ -79,33 +81,41 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   if (png_ptr == NULL)
      return;
+
   /* Check if data really is near. If so, use usual code. */
   n_data = (png_byte *)CVT_PTR_NOCHECK(data);
   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+
   if ((png_bytep)n_data == data)
   {
      check = fread(n_data, 1, length, io_ptr);
   }
+
   else
   {
      png_byte buf[NEAR_BUF_SIZE];
      png_size_t read, remaining, err;
      check = 0;
      remaining = length;
+
      do
      {
         read = MIN(NEAR_BUF_SIZE, remaining);
         err = fread(buf, 1, read, io_ptr);
         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
+
         if (err != read)
            break;
+
         else
            check += err;
+
         data += read;
         remaining -= read;
      }
      while (remaining != 0);
   }
+
   if ((png_uint_32)check != (png_uint_32)length)
      png_error(png_ptr, "read Error");
 }
@@ -116,9 +126,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 * for libpng if standard C streams aren't being used.
 *
 * This function takes as its arguments:
+ *
 * png_ptr      - pointer to a png input data structure
+ *
 * io_ptr       - pointer to user supplied structure containing info about
 *                the input functions.  May be NULL.
+ *
 * read_data_fn - pointer to a new input function that takes as its
 *                arguments a pointer to a png_struct, a pointer to
 *                a location where input data can be stored, and a 32-bit
@@ -134,11 +147,13 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
 {
   if (png_ptr == NULL)
      return;
+
   png_ptr->io_ptr = io_ptr;

 #ifdef PNG_STDIO_SUPPORTED
   if (read_data_fn != NULL)
      png_ptr->read_data_fn = read_data_fn;
+
   else
      png_ptr->read_data_fn = png_default_read_data;
 #else
--- a/pngrtran.c
+++ b/pngrtran.c
--- a/pngrutil.c
+++ b/pngrutil.c
--- a/pngset.c
+++ b/pngset.c
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -1,11 +1,11 @@

 /* pngstruct.h - header file for PNG reference library
 *
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 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.)
 *
- * Last changed in libpng version 1.5.0 - April 18, 2010
+ * Last changed in libpng 1.5.5 [September 22, 2011]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -20,14 +20,22 @@

 #ifndef PNGSTRUCT_H
 #define PNGSTRUCT_H
+/* zlib.h defines the structure z_stream, an instance of which is included
+ * in this structure and is required for decompressing the LZ compressed
+ * data in PNG files.
+ */
+#include "zlib.h"
+
 struct png_struct_def
 {
 #ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf png_jmpbuf;            /* used in png_error */
+   jmp_buf longjmp_buffer;    /* used in png_error */
   png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
 #endif
   png_error_ptr error_fn;    /* function for printing errors and aborting */
+#ifdef PNG_WARNINGS_SUPPORTED
   png_error_ptr warning_fn;  /* function for printing warnings */
+#endif
   png_voidp error_ptr;       /* user supplied struct for error functions */
   png_rw_ptr write_data_fn;  /* function for writing output data */
   png_rw_ptr read_data_fn;   /* function for reading input data */
@@ -57,12 +65,37 @@ struct png_struct_def

   z_stream zstream;          /* pointer to decompression structure (below) */
   png_bytep zbuf;            /* buffer for zlib */
-   png_size_t zbuf_size;      /* size of zbuf */
+   uInt zbuf_size;            /* size of zbuf (typically 65536) */
+#ifdef PNG_WRITE_SUPPORTED
+
+/* Added in 1.5.4: state to keep track of whether the zstream has been
+ * initialized and if so whether it is for IDAT or some other chunk.
+ */
+#define PNG_ZLIB_UNINITIALIZED 0
+#define PNG_ZLIB_FOR_IDAT      1
+#define PNG_ZLIB_FOR_TEXT      2 /* anything other than IDAT */
+#define PNG_ZLIB_USE_MASK      3 /* bottom two bits */
+#define PNG_ZLIB_IN_USE        4 /* a flag value */
+
+   png_uint_32 zlib_state;       /* State of zlib initialization */
+/* End of material added at libpng 1.5.4 */
+
   int zlib_level;            /* holds zlib compression level */
   int zlib_method;           /* holds zlib compression method */
   int zlib_window_bits;      /* holds zlib compression window bits */
   int zlib_mem_level;        /* holds zlib compression memory level */
   int zlib_strategy;         /* holds zlib compression strategy */
+#endif
+/* Added at libpng 1.5.4 */
+#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \
+    defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED)
+   int zlib_text_level;            /* holds zlib compression level */
+   int zlib_text_method;           /* holds zlib compression method */
+   int zlib_text_window_bits;      /* holds zlib compression window bits */
+   int zlib_text_mem_level;        /* holds zlib compression memory level */
+   int zlib_text_strategy;         /* holds zlib compression strategy */
+#endif
+/* End of material added at libpng 1.5.4 */

   png_uint_32 width;         /* width of image in pixels */
   png_uint_32 height;        /* height of image in pixels */
@@ -71,20 +104,24 @@ struct png_struct_def
   png_size_t rowbytes;       /* size of row in bytes */
   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
   png_uint_32 row_number;    /* current row in interlace pass */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
+   png_uint_32 chunk_name;    /* PNG_CHUNK() id of current chunk */
+   png_bytep prev_row;        /* buffer to save previous (unfiltered) row.
+                               * This is a pointer into big_prev_row
+                               */
+   png_bytep row_buf;         /* buffer to save current (unfiltered) row.
+                               * This is a pointer into big_row_buf
+                               */
   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
   png_bytep up_row;          /* buffer to save "up" row when filtering */
   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
-   png_row_info row_info;     /* used for transformation routines */
+   png_size_t info_rowbytes;  /* Added in 1.5.4: cache of updated row bytes */

   png_uint_32 idat_size;     /* current IDAT size for read */
   png_uint_32 crc;           /* current chunk CRC value */
   png_colorp palette;        /* palette from the input file */
   png_uint_16 num_palette;   /* number of color entries in palette */
   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte chunk_name[5];    /* null-terminated name of current chunk */
   png_byte compression;      /* file compression type (always 0) */
   png_byte filter;           /* file filter type (always 0) */
   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
@@ -92,21 +129,26 @@ struct png_struct_def
   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
   png_byte color_type;       /* color type of file */
   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row */
+   png_byte usr_bit_depth;    /* bit depth of users row: write only */
   png_byte pixel_depth;      /* number of bits per pixel */
   png_byte channels;         /* number of channels in file */
-   png_byte usr_channels;     /* channels at start of write */
+   png_byte usr_channels;     /* channels at start of write: write only */
   png_byte sig_bytes;        /* magic bytes read/written from start of file */
+   png_byte maximum_pixel_depth;
+                              /* pixel depth used for the row buffers */
+   png_byte transformed_pixel_depth;
+                              /* pixel depth after read/write transforms */
+   png_byte io_chunk_string[5];
+                              /* string name of chunk */

 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
   png_uint_16 filler;           /* filler bytes for pixel expansion */
 #endif

-#ifdef PNG_bKGD_SUPPORTED
+#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
   png_byte background_gamma_type;
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-   float background_gamma;
-#  endif
+   png_fixed_point background_gamma;
   png_color_16 background;   /* background color in screen gamma space */
 #ifdef PNG_READ_GAMMA_SUPPORTED
   png_color_16 background_1; /* background normalized to gamma 1.0 */
@@ -119,21 +161,21 @@ struct png_struct_def
   png_uint_32 flush_rows;    /* number of rows written since last flush */
 #endif

-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float gamma;          /* file gamma value */
-   float screen_gamma;   /* screen gamma value (display_exponent) */
-#endif
-#endif
+   png_fixed_point gamma;        /* file gamma value */
+   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */

-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
+   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
+#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
 #endif

 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
@@ -154,7 +196,7 @@ struct png_struct_def
   png_write_status_ptr write_row_fn; /* called after each row is encoded */
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
+   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
   png_progressive_end_ptr end_fn;   /* called after image is complete */
   png_bytep save_buffer_ptr;        /* current location in save_buffer */
   png_bytep save_buffer;            /* buffer for previously read data */
@@ -207,7 +249,7 @@ struct png_struct_def
 #endif

 #ifdef PNG_TIME_RFC1123_SUPPORTED
-   png_charp time_buffer; /* String to hold RFC 1123 time text */
+   char time_buffer[29]; /* String to hold RFC 1123 time text */
 #endif

 /* New members added in libpng-1.0.6 */
@@ -224,13 +266,20 @@ struct png_struct_def
   png_bytep chunk_list;
 #endif

+#ifdef PNG_READ_sRGB_SUPPORTED
+   /* Added in 1.5.5 to record an sRGB chunk in the png. */
+   png_byte is_sRGB;
+#endif
+
 /* New members added in libpng-1.0.3 */
 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
   png_byte rgb_to_gray_status;
+   /* Added in libpng 1.5.5 to record setting of coefficients: */
+   png_byte rgb_to_gray_coefficients_set;
   /* These were changed from png_byte in libpng-1.0.6 */
   png_uint_16 rgb_to_gray_red_coeff;
   png_uint_16 rgb_to_gray_green_coeff;
-   png_uint_16 rgb_to_gray_blue_coeff;
+   /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
 #endif

 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
@@ -241,11 +290,6 @@ struct png_struct_def
   png_uint_32 mng_features_permitted;
 #endif

-/* New member added in libpng-1.0.7 */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_fixed_point int_gamma;
-#endif
-
 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
 #ifdef PNG_MNG_FEATURES_SUPPORTED
   png_byte filter_type;
@@ -287,7 +331,7 @@ struct png_struct_def
   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
    * can occupy when decompressed.  0 means unlimited.
    */
-   png_uint_32 user_chunk_malloc_max;
+   png_alloc_size_t user_chunk_malloc_max;
 #endif

 /* New member added in libpng-1.0.25 and 1.2.17 */
@@ -296,9 +340,8 @@ struct png_struct_def
   png_unknown_chunk unknown_chunk;
 #endif

-/* New members added in libpng-1.2.26 */
-  png_uint_32 old_big_row_buf_size;
-  png_uint_32 old_prev_row_size;
+/* New member added in libpng-1.2.26 */
+  png_size_t old_big_row_buf_size;

 /* New member added in libpng-1.2.30 */
  png_charp chunkdata;  /* buffer for reading chunk data */
@@ -307,5 +350,11 @@ struct png_struct_def
 /* New member added in libpng-1.4.0 */
   png_uint_32 io_state;
 #endif
+
+/* New member added in libpng-1.5.6 */
+   png_bytep big_prev_row;
+
+   void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
+      png_bytep row, png_const_bytep prev_row);
 };
 #endif /* PNGSTRUCT_H */
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,8 +1,8 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.6 [November 3, 2011]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -31,6 +31,9 @@
 * of files at once by typing "pngtest -m file1.png file2.png ..."
 */

+#define _POSIX_SOURCE 1
+
+#include "zlib.h"
 #include "png.h"
 /* Copied from pngpriv.h but only used in error messages below. */
 #ifndef PNG_ZBUF_SIZE
@@ -42,7 +45,7 @@
 #  define FCLOSE(file) fclose(file)

 #ifndef PNG_STDIO_SUPPORTED
-     typedef FILE                * png_FILE_p;
+typedef FILE                * png_FILE_p;
 #endif

 /* Makes pngtest verbose so we can find problems. */
@@ -64,6 +67,17 @@
 #  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
 #endif

+/* The code uses memcmp and memcpy on large objects (typically row pointers) so
+ * it is necessary to do soemthing special on certain architectures, note that
+ * the actual support for this was effectively removed in 1.4, so only the
+ * memory remains in this program:
+ */
+#define CVT_PTR(ptr)         (ptr)
+#define CVT_PTR_NOCHECK(ptr) (ptr)
+#define png_memcmp  memcmp
+#define png_memcpy  memcpy
+#define png_memset  memset
+
 /* Turn on CPU timing
 #define PNGTEST_TIMING
 */
@@ -84,6 +98,7 @@ static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
 #endif

 static int verbose = 0;
+static int strict = 0;

 int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));

@@ -112,18 +127,22 @@ read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
      return;
+
   if (status_pass != pass)
   {
      fprintf(stdout, "\n Pass %d: ", pass);
      status_pass = pass;
      status_dots = 31;
   }
+
   status_dots--;
+
   if (status_dots == 0)
   {
      fprintf(stdout, "\n         ");
      status_dots=30;
   }
+
   fprintf(stdout, "r");
 }

@@ -134,6 +153,7 @@ write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
      return;
+
   fprintf(stdout, "w");
 }

@@ -167,7 +187,8 @@ void PNGCBAPI
 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 {
   png_bytep dp = data;
-   if (png_ptr == NULL)return;
+   if (png_ptr == NULL)
+      return;

   /* Contents of row_info:
    *  png_uint_32 width      width of row
@@ -184,41 +205,49 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
    {
       int pos = 0;
       png_uint_32 n, nstop;
+
       for (n = 0, nstop=row_info->width; n<nstop; n++)
       {
          if (row_info->bit_depth == 1)
          {
             if (((*dp << pos++ ) & 0x80) == 0)
                zero_samples++;
+
             if (pos == 8)
             {
                pos = 0;
                dp++;
             }
          }
+
          if (row_info->bit_depth == 2)
          {
             if (((*dp << (pos+=2)) & 0xc0) == 0)
                zero_samples++;
+
             if (pos == 8)
             {
                pos = 0;
                dp++;
             }
          }
+
          if (row_info->bit_depth == 4)
          {
             if (((*dp << (pos+=4)) & 0xf0) == 0)
                zero_samples++;
+
             if (pos == 8)
             {
                pos = 0;
                dp++;
             }
          }
+
          if (row_info->bit_depth == 8)
             if (*dp++ == 0)
                zero_samples++;
+
          if (row_info->bit_depth == 16)
          {
             if ((*dp | *(dp+1)) == 0)
@@ -241,10 +270,12 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
             if (row_info->bit_depth == 8)
                if (*dp++ == 0)
                   zero_samples++;
+
             if (row_info->bit_depth == 16)
             {
                if ((*dp | *(dp+1)) == 0)
                   zero_samples++;
+
                dp+=2;
             }
          }
@@ -271,6 +302,48 @@ static int wrote_question = 0;
 * than changing the library.
 */

+#ifdef PNG_IO_STATE_SUPPORTED
+void
+pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+   png_uint_32 io_op);
+void
+pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+   png_uint_32 io_op)
+{
+   png_uint_32 io_state = png_get_io_state(png_ptr);
+   int err = 0;
+
+   /* Check if the current operation (reading / writing) is as expected. */
+   if ((io_state & PNG_IO_MASK_OP) != io_op)
+      png_error(png_ptr, "Incorrect operation in I/O state");
+
+   /* Check if the buffer size specific to the current location
+    * (file signature / header / data / crc) is as expected.
+    */
+   switch (io_state & PNG_IO_MASK_LOC)
+   {
+   case PNG_IO_SIGNATURE:
+      if (data_length > 8)
+         err = 1;
+      break;
+   case PNG_IO_CHUNK_HDR:
+      if (data_length != 8)
+         err = 1;
+      break;
+   case PNG_IO_CHUNK_DATA:
+      break;  /* no restrictions here */
+   case PNG_IO_CHUNK_CRC:
+      if (data_length != 4)
+         err = 1;
+      break;
+   default:
+      err = 1;  /* uninitialized */
+   }
+   if (err)
+      png_error(png_ptr, "Bad I/O state or buffer size");
+}
+#endif
+
 #ifndef USE_FAR_KEYWORD
 static void PNGCBAPI
 pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -289,8 +362,12 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)

   if (check != length)
   {
-      png_error(png_ptr, "Read Error!");
+      png_error(png_ptr, "Read Error");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -321,6 +398,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
      png_size_t read, remaining, err;
      check = 0;
      remaining = length;
+
      do
      {
         read = MIN(NEAR_BUF_SIZE, remaining);
@@ -335,8 +413,13 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
      }
      while (remaining != 0);
   }
+
   if (check != length)
-      png_error(png_ptr, "read Error");
+      png_error(png_ptr, "Read Error");
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
+#endif
 }
 #endif /* USE_FAR_KEYWORD */

@@ -345,7 +428,7 @@ static void PNGCBAPI
 pngtest_flush(png_structp png_ptr)
 {
   /* Do nothing; fflush() is said to be just a waste of energy. */
-   png_ptr = png_ptr;  /* Stifle compiler warning */
+   PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
 }
 #endif

@@ -361,10 +444,15 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   png_size_t check;

   check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
+
   if (check != length)
   {
      png_error(png_ptr, "Write Error");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
+#endif
 }
 #else
 /* This is the model-independent version. Since the standard I/O library
@@ -385,16 +473,19 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
   /* Check if data really is near. If so, use usual code. */
   near_data = (png_byte *)CVT_PTR_NOCHECK(data);
   io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr));
+
   if ((png_bytep)near_data == data)
   {
      check = fwrite(near_data, 1, length, io_ptr);
   }
+
   else
   {
      png_byte buf[NEAR_BUF_SIZE];
      png_size_t written, remaining, err;
      check = 0;
      remaining = length;
+
      do
      {
         written = MIN(NEAR_BUF_SIZE, remaining);
@@ -409,10 +500,15 @@ pngtest_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");
   }
+
+#ifdef PNG_IO_STATE_SUPPORTED
+   pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
+#endif
 }
 #endif /* USE_FAR_KEYWORD */

@@ -427,8 +523,10 @@ pngtest_warning(png_structp png_ptr, png_const_charp message)
   PNG_CONST char *name = "UNKNOWN (ERROR!)";
   char *test;
   test = png_get_error_ptr(png_ptr);
+
   if (test == NULL)
     fprintf(STDERR, "%s: libpng warning: %s\n", name, message);
+
   else
     fprintf(STDERR, "%s: libpng warning: %s\n", test, message);
 }
@@ -502,12 +600,16 @@ PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
      current_allocation += size;
      total_allocation += size;
      num_allocations ++;
+
      if (current_allocation > maximum_allocation)
         maximum_allocation = current_allocation;
+
      pinfo->pointer = png_malloc(png_ptr, size);
      /* Restore malloc_fn and free_fn */
+
      png_set_mem_fn(png_ptr,
          NULL, png_debug_malloc, png_debug_free);
+
      if (size != 0 && pinfo->pointer == NULL)
      {
         current_allocation -= size;
@@ -515,13 +617,16 @@ PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
         png_error(png_ptr,
           "out of memory in pngtest->png_debug_malloc");
      }
+
      pinfo->next = pinformation;
      pinformation = pinfo;
      /* Make sure the caller isn't assuming zeroed memory. */
      png_memset(pinfo->pointer, 0xdd, pinfo->size);
+
      if (verbose)
         printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
            pinfo->pointer);
+
      return (png_voidp)(pinfo->pointer);
   }
 }
@@ -532,6 +637,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
 {
   if (png_ptr == NULL)
      fprintf(STDERR, "NULL pointer to png_debug_free.\n");
+
   if (ptr == 0)
   {
 #if 0 /* This happens all the time. */
@@ -543,9 +649,11 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
   /* Unlink the element from the list. */
   {
      memory_infop FAR *ppinfo = &pinformation;
+
      for (;;)
      {
         memory_infop pinfo = *ppinfo;
+
         if (pinfo->pointer == ptr)
         {
            *ppinfo = pinfo->next;
@@ -559,11 +667,13 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
            pinfo = NULL;
            break;
         }
+
         if (pinfo->next == NULL)
         {
            fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
            break;
         }
+
         ppinfo = &pinfo->next;
      }
   }
@@ -571,6 +681,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
   /* Finally free the data. */
   if (verbose)
      printf("Freeing %p\n", ptr);
+
   png_free_default(png_ptr, ptr);
   ptr = NULL;
 }
@@ -617,8 +728,10 @@ static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr,
         /* Found sTER chunk */
         if (chunk->size != 1)
            return (-1); /* Error return */
+
         if (chunk->data[0] != 0 && chunk->data[0] != 1)
            return (-1);  /* Invalid mode */
+
         my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
         my_user_chunk_data[0]=chunk->data[0]+1;
         return (1);
@@ -669,7 +782,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   int bit_depth, color_type;
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
-   jmp_buf png_jmpbuf;
+   jmp_buf tmp_jmpbuf;
 #endif
 #endif

@@ -738,7 +851,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_SETJMP_SUPPORTED
   pngtest_debug("Setting jmpbuf for read struct");
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(png_jmpbuf))
+   if (setjmp(tmp_jmpbuf))
 #else
   if (setjmp(png_jmpbuf(read_ptr)))
 #endif
@@ -756,13 +869,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      return (1);
   }
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(read_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(read_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif

 #ifdef PNG_WRITE_SUPPORTED
   pngtest_debug("Setting jmpbuf for write struct");
 #ifdef USE_FAR_KEYWORD
-   if (setjmp(png_jmpbuf))
+
+   if (setjmp(tmp_jmpbuf))
 #else
   if (setjmp(png_jmpbuf(write_ptr)))
 #endif
@@ -777,8 +891,9 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      FCLOSE(fpout);
      return (1);
   }
+
 #ifdef USE_FAR_KEYWORD
-   png_memcpy(png_jmpbuf(write_ptr), png_jmpbuf, png_sizeof(jmp_buf));
+   png_memcpy(png_jmpbuf(write_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
 #endif
 #endif
 #endif
@@ -800,6 +915,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #    endif
 #  endif
 #endif
+
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
+   /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
+    * This is here just to make pngtest replicate the results from libpng
+    * versions prior to 1.5.4, and to test this new API.
+    */
+   png_set_text_compression_strategy(write_ptr, Z_FILTERED);
+#endif
+
   if (status_dots_requested == 1)
   {
 #ifdef PNG_WRITE_SUPPORTED
@@ -807,6 +931,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
      png_set_read_status_fn(read_ptr, read_row_callback);
   }
+
   else
   {
 #ifdef PNG_WRITE_SUPPORTED
@@ -818,8 +943,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
   {
      int i;
+
      for (i = 0; i<256; i++)
         filters_used[i] = 0;
+
      png_set_read_user_transform_fn(read_ptr, count_filters);
   }
 #endif
@@ -866,6 +993,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   {
      png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
         blue_y;
+
      if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
         &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y))
      {
@@ -888,6 +1016,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   {
      double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
         blue_y;
+
      if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
         &red_y, &green_x, &green_y, &blue_x, &blue_y))
      {
@@ -909,7 +1038,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_iCCP_SUPPORTED
   {
      png_charp name;
-      png_charp profile;
+      png_bytep profile;
      png_uint_32 proflen;
      int compression_type;

@@ -1034,6 +1163,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
      {
         pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
+
+         if (verbose)
+            printf("\nText compression=%d\n", text_ptr->compression);
+
         png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
      }
   }
@@ -1053,6 +1186,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
         png_memcpy(tIME_string,
                    png_convert_to_rfc1123(read_ptr, mod_time),
                    png_sizeof(tIME_string));
+
         tIME_string[png_sizeof(tIME_string) - 1] = '\0';
         tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
@@ -1084,18 +1218,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
   {
      png_unknown_chunkp unknowns;
-      int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
         &unknowns);
+
      if (num_unknowns)
      {
-         png_size_t i;
+         int i;
         png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
           num_unknowns);
         /* Copy the locations from the read_info_ptr.  The automatically
          * generated locations in write_info_ptr are wrong because we
          * haven't written anything yet.
          */
-         for (i = 0; i < (png_size_t)num_unknowns; i++)
+         for (i = 0; i < num_unknowns; i++)
           png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
             unknowns[i].location);
      }
@@ -1121,9 +1256,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      if (verbose)
         fprintf(STDERR, "\n stereo mode = %lu\n",
           (unsigned long)(user_chunk_data[0] - 1));
+
      ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
      png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
   }
+
   if (user_chunk_data[1] != 0 || user_chunk_data[2] != 0)
   {
      png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
@@ -1136,6 +1273,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
           (unsigned long)user_chunk_data[1],
           (unsigned long)user_chunk_data[2],
           (unsigned long)user_chunk_data[3]);
+
      png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
      png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
      vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
@@ -1149,6 +1287,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
   pngtest_debug("Allocating row buffer...");
   row_buf = (png_bytep)png_malloc(read_ptr,
      png_get_rowbytes(read_ptr, read_info_ptr));
+
   pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
 #endif /* SINGLE_ROWBUF_ALLOC */
   pngtest_debug("Writing row data");
@@ -1177,8 +1316,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
         pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
         row_buf = (png_bytep)png_malloc(read_ptr,
            png_get_rowbytes(read_ptr, read_info_ptr));
+
         pngtest_debug2("\t0x%08lx (%u bytes)", (unsigned long)row_buf,
            png_get_rowbytes(read_ptr, read_info_ptr));
+
 #endif /* !SINGLE_ROWBUF_ALLOC */
         png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);

@@ -1240,6 +1381,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
         png_memcpy(tIME_string,
                    png_convert_to_rfc1123(read_ptr, mod_time),
                    png_sizeof(tIME_string));
+
         tIME_string[png_sizeof(tIME_string) - 1] = '\0';
         tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
@@ -1249,19 +1391,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
   {
      png_unknown_chunkp unknowns;
-      int num_unknowns;
-      num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
+      int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
         &unknowns);
+
      if (num_unknowns)
      {
-         png_size_t i;
+         int i;
         png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
           num_unknowns);
         /* Copy the locations from the read_info_ptr.  The automatically
          * generated locations in write_end_info_ptr are wrong because we
          * haven't written the end_info yet.
          */
-         for (i = 0; i < (png_size_t)num_unknowns; i++)
+         for (i = 0; i < num_unknowns; i++)
           png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
             unknowns[i].location);
      }
@@ -1326,6 +1468,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      {
         fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
                 inname, outname);
+
         if (wrote_question == 0)
         {
            fprintf(STDERR,
@@ -1338,9 +1481,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
              ZLIB_VERSION);
            wrote_question = 1;
         }
+
         FCLOSE(fpin);
         FCLOSE(fpout);
-         return (0);
+
+         if (strict != 0)
+           return (1);
+
+         else
+           return (0);
      }

      if (!num_in)
@@ -1349,6 +1498,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
      if (png_memcmp(inbuf, outbuf, num_in))
      {
         fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname);
+
         if (wrote_question == 0)
         {
            fprintf(STDERR,
@@ -1361,9 +1511,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
              ZLIB_VERSION);
            wrote_question = 1;
         }
+
         FCLOSE(fpin);
         FCLOSE(fpout);
-         return (0);
+
+         if (strict != 0)
+           return (1);
+
+         else
+           return (0);
      }
   }

@@ -1395,6 +1551,7 @@ main(int argc, char *argv[])
   fprintf(STDERR, " library (%lu):%s",
      (unsigned long)png_access_version_number(),
      png_get_header_version(NULL));
+
   /* Show the version of libpng used in building the application */
   fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
      PNG_HEADER_VERSION_STRING);
@@ -1428,6 +1585,7 @@ main(int argc, char *argv[])
         multiple = 1;
         status_dots_requested = 0;
      }
+
      else if (strcmp(argv[1], "-mv") == 0 ||
               strcmp(argv[1], "-vm") == 0 )
      {
@@ -1435,12 +1593,22 @@ main(int argc, char *argv[])
         verbose = 1;
         status_dots_requested = 1;
      }
+
      else if (strcmp(argv[1], "-v") == 0)
      {
         verbose = 1;
         status_dots_requested = 1;
         inname = argv[2];
      }
+
+      else if (strcmp(argv[1], "--strict") == 0)
+      {
+         status_dots_requested = 0;
+         verbose = 1;
+         inname = argv[2];
+         strict++;
+      }
+
      else
      {
         inname = argv[1];
@@ -1494,9 +1662,11 @@ main(int argc, char *argv[])
 #ifdef PNG_TIME_RFC1123_SUPPORTED
         if (tIME_chunk_present != 0)
            fprintf(STDERR, " tIME = %s\n", tIME_string);
+
         tIME_chunk_present = 0;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
         }
+
         else
         {
            fprintf(STDERR, " FAIL\n");
@@ -1506,17 +1676,19 @@ main(int argc, char *argv[])
         if (allocation_now != current_allocation)
            fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation - allocation_now);
+
         if (current_allocation != 0)
         {
            memory_infop pinfo = pinformation;

            fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
               current_allocation);
+
            while (pinfo != NULL)
            {
               fprintf(STDERR, " %lu bytes at %x\n",
                 (unsigned long)pinfo->size,
-                 (unsigned int) pinfo->pointer);
+                 (unsigned int)pinfo->pointer);
               pinfo = pinfo->next;
            }
         }
@@ -1533,6 +1705,7 @@ main(int argc, char *argv[])
            num_allocations);
 #endif
   }
+
   else
   {
      int i;
@@ -1542,11 +1715,17 @@ main(int argc, char *argv[])
 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
         int allocation_now = current_allocation;
 #endif
-         if (i == 1) status_dots_requested = 1;
-         else if (verbose == 0)status_dots_requested = 0;
+         if (i == 1)
+            status_dots_requested = 1;
+
+         else if (verbose == 0)
+            status_dots_requested = 0;
+
         if (i == 0 || verbose == 1 || ierror != 0)
            fprintf(STDERR, "\n Testing %s:", inname);
+
         kerror = test_one_file(inname, outname);
+
         if (kerror == 0)
         {
            if (verbose == 1 || i == 2)
@@ -1572,10 +1751,12 @@ main(int argc, char *argv[])
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
            }
         }
+
         else
         {
            if (verbose == 0 && i != 2)
               fprintf(STDERR, "\n Testing %s:", inname);
+
            fprintf(STDERR, " FAIL\n");
            ierror += kerror;
         }
@@ -1583,12 +1764,14 @@ main(int argc, char *argv[])
         if (allocation_now != current_allocation)
             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
               current_allocation - allocation_now);
+
         if (current_allocation != 0)
         {
             memory_infop pinfo = pinformation;

             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
                current_allocation);
+
             while (pinfo != NULL)
             {
                fprintf(STDERR, " %lu bytes at %x\n",
@@ -1626,10 +1809,12 @@ main(int argc, char *argv[])

   if (ierror == 0)
      fprintf(STDERR, " libpng passes test\n");
+
   else
      fprintf(STDERR, " libpng FAILS test\n");
+
   return (int)(ierror != 0);
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_5_0beta18 your_png_h_is_not_version_1_5_0beta18;
+typedef png_libpng_version_1_5_7rc03 Your_png_h_is_not_version_1_5_7rc03;
--- a/pngtest.png
+++ b/pngtest.png
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,8 +1,8 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.4 [July 7, 2011]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -24,6 +24,7 @@ png_set_bgr(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_BGR;
 }
 #endif
@@ -37,6 +38,7 @@ png_set_swap(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   if (png_ptr->bit_depth == 16)
      png_ptr->transformations |= PNG_SWAP_BYTES;
 }
@@ -51,6 +53,7 @@ png_set_packing(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   if (png_ptr->bit_depth < 8)
   {
      png_ptr->transformations |= PNG_PACK;
@@ -68,6 +71,7 @@ png_set_packswap(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   if (png_ptr->bit_depth < 8)
      png_ptr->transformations |= PNG_PACKSWAP;
 }
@@ -75,12 +79,13 @@ png_set_packswap(png_structp png_ptr)

 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
 void PNGAPI
-png_set_shift(png_structp png_ptr, png_color_8p true_bits)
+png_set_shift(png_structp png_ptr, png_const_color_8p true_bits)
 {
   png_debug(1, "in png_set_shift");

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_SHIFT;
   png_ptr->shift = *true_bits;
 }
@@ -116,10 +121,13 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_FILLER;
   png_ptr->filler = (png_uint_16)filler;
+
   if (filler_loc == PNG_FILLER_AFTER)
      png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
+
   else
      png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;

@@ -150,6 +158,7 @@ png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)

   if (png_ptr == NULL)
      return;
+
   png_set_filler(png_ptr, filler, filler_loc);
   png_ptr->transformations |= PNG_ADD_ALPHA;
 }
@@ -165,6 +174,7 @@ png_set_swap_alpha(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_SWAP_ALPHA;
 }
 #endif
@@ -178,6 +188,7 @@ png_set_invert_alpha(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_INVERT_ALPHA;
 }
 #endif
@@ -190,6 +201,7 @@ png_set_invert_mono(png_structp png_ptr)

   if (png_ptr == NULL)
      return;
+
   png_ptr->transformations |= PNG_INVERT_MONO;
 }

@@ -205,8 +217,8 @@ png_do_invert(png_row_infop row_info, png_bytep row)
   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i++)
      {
@@ -214,12 +226,13 @@ png_do_invert(png_row_infop row_info, png_bytep row)
         rp++;
      }
   }
+
   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
      row_info->bit_depth == 8)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i += 2)
      {
@@ -227,12 +240,14 @@ png_do_invert(png_row_infop row_info, png_bytep row)
         rp += 2;
      }
   }
+
+#ifdef PNG_16BIT_SUPPORTED
   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
      row_info->bit_depth == 16)
   {
      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop = row_info->rowbytes;
+      png_size_t i;
+      png_size_t istop = row_info->rowbytes;

      for (i = 0; i < istop; i += 4)
      {
@@ -241,9 +256,11 @@ png_do_invert(png_row_infop row_info, png_bytep row)
         rp += 4;
      }
   }
+#endif
 }
 #endif

+#ifdef PNG_16BIT_SUPPORTED
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* Swaps byte order on 16 bit depth images */
 void /* PRIVATE */
@@ -251,8 +268,7 @@ png_do_swap(png_row_infop row_info, png_bytep row)
 {
   png_debug(1, "in png_do_swap");

-   if (
-       row_info->bit_depth == 16)
+   if (row_info->bit_depth == 16)
   {
      png_bytep rp = row;
      png_uint_32 i;
@@ -267,6 +283,7 @@ png_do_swap(png_row_infop row_info, png_bytep row)
   }
 }
 #endif
+#endif

 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 static PNG_CONST png_byte onebppswaptable[256] = {
@@ -380,19 +397,22 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
 {
   png_debug(1, "in png_do_packswap");

-   if (
-       row_info->bit_depth < 8)
+   if (row_info->bit_depth < 8)
   {
-      png_bytep rp, end, table;
+      png_bytep rp;
+      png_const_bytep end, table;

      end = row + row_info->rowbytes;

      if (row_info->bit_depth == 1)
-         table = (png_bytep)onebppswaptable;
+         table = onebppswaptable;
+
      else if (row_info->bit_depth == 2)
-         table = (png_bytep)twobppswaptable;
+         table = twobppswaptable;
+
      else if (row_info->bit_depth == 4)
-         table = (png_bytep)fourbppswaptable;
+         table = fourbppswaptable;
+
      else
         return;

@@ -404,158 +424,119 @@ 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) */
+/* Remove a channel - this used to be 'png_do_strip_filler' but it used a
+ * somewhat weird combination of flags to determine what to do.  All the calls
+ * to png_do_strip_filler are changed in 1.5.2 to call this instead with the
+ * correct arguments.
+ *
+ * The routine isn't general - the channel must be the channel at the start or
+ * end (not in the middle) of each pixel.
+ */
 void /* PRIVATE */
-png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
+png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
 {
-   png_debug(1, "in png_do_strip_filler");
+   png_bytep sp = row; /* source pointer */
+   png_bytep dp = row; /* destination pointer */
+   png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */

+   /* At the start sp will point to the first byte to copy and dp to where
+    * it is copied to.  ep always points just beyond the end of the row, so
+    * the loop simply copies (channels-1) channels until sp reaches ep.
+    *
+    * at_start:        0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
+    *            nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
+    */
+
+   /* GA, GX, XG cases */
+   if (row_info->channels == 2)
   {
-      png_bytep sp = row;
-      png_bytep dp = row;
-      png_uint_32 row_width = row_info->width;
-      png_uint_32 i;
-
-      if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
-          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-          (flags & PNG_FLAG_STRIP_ALPHA))) &&
-          row_info->channels == 4)
+      if (row_info->bit_depth == 8)
      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This converts from RGBX or RGBA to RGB */
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               dp += 3; sp += 4;
-               for (i = 1; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp++;
-               }
-            }
-            /* This converts from XRGB or ARGB to RGB */
-            else
-            {
-               for (i = 0; i < row_width; i++)
-               {
-                  sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-            row_info->pixel_depth = 24;
-            row_info->rowbytes = row_width * 3;
-         }
-         else /* if (row_info->bit_depth == 16) */
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
-               sp += 8; dp += 6;
-               for (i = 1; i < row_width; i++)
-               {
-                  /* This could be (although png_memcpy is probably slower):
-                  png_memcpy(dp, sp, 6);
-                  sp += 8;
-                  dp += 6;
-                  */
+         if (at_start) /* Skip initial filler */
+            ++sp;
+         else          /* Skip initial channel and, for sp, the filler */
+            sp += 2, ++dp;

-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp += 2;
-               }
-            }
-            else
-            {
-               /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
-               for (i = 0; i < row_width; i++)
-               {
-                  /* This could be (although png_memcpy is probably slower):
-                  png_memcpy(dp, sp, 6);
-                  sp += 8;
-                  dp += 6;
-                  */
+         /* For a 1 pixel wide image there is nothing to do */
+         while (sp < ep)
+            *dp++ = *sp, sp += 2;

-                  sp += 2;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-            row_info->pixel_depth = 48;
-            row_info->rowbytes = row_width * 6;
-         }
-         row_info->channels = 3;
+         row_info->pixel_depth = 8;
      }
-      else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
-         (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-         (flags & PNG_FLAG_STRIP_ALPHA))) &&
-          row_info->channels == 2)
+
+      else if (row_info->bit_depth == 16)
      {
-         if (row_info->bit_depth == 8)
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from GX or GA to G */
-               for (i = 0; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  sp++;
-               }
-            }
-            else
-            {
-               /* This converts from XG or AG to G */
-               for (i = 0; i < row_width; i++)
-               {
-                  sp++;
-                  *dp++ = *sp++;
-               }
-            }
-            row_info->pixel_depth = 8;
-            row_info->rowbytes = row_width;
-         }
-         else /* if (row_info->bit_depth == 16) */
-         {
-            if (flags & PNG_FLAG_FILLER_AFTER)
-            {
-               /* This converts from GGXX or GGAA to GG */
-               sp += 4; dp += 2;
-               for (i = 1; i < row_width; i++)
-               {
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-                  sp += 2;
-               }
-            }
-            else
-            {
-               /* This converts from XXGG or AAGG to GG */
-               for (i = 0; i < row_width; i++)
-               {
-                  sp += 2;
-                  *dp++ = *sp++;
-                  *dp++ = *sp++;
-               }
-            }
-            row_info->pixel_depth = 16;
-            row_info->rowbytes = row_width * 2;
-         }
-         row_info->channels = 1;
+         if (at_start) /* Skip initial filler */
+            sp += 2;
+         else          /* Skip initial channel and, for sp, the filler */
+            sp += 4, dp += 2;
+
+         while (sp < ep)
+            *dp++ = *sp++, *dp++ = *sp, sp += 3;
+
+         row_info->pixel_depth = 16;
      }
-      if (flags & PNG_FLAG_STRIP_ALPHA)
-        row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
+
+      else
+         return; /* bad bit depth */
+
+      row_info->channels = 1;
+
+      /* Finally fix the color type if it records an alpha channel */
+      if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+         row_info->color_type = PNG_COLOR_TYPE_GRAY;
   }
+
+   /* RGBA, RGBX, XRGB cases */
+   else if (row_info->channels == 4)
+   {
+      if (row_info->bit_depth == 8)
+      {
+         if (at_start) /* Skip initial filler */
+            ++sp;
+         else          /* Skip initial channels and, for sp, the filler */
+            sp += 4, dp += 3;
+
+         /* Note that the loop adds 3 to dp and 4 to sp each time. */
+         while (sp < ep)
+            *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;
+
+         row_info->pixel_depth = 24;
+      }
+
+      else if (row_info->bit_depth == 16)
+      {
+         if (at_start) /* Skip initial filler */
+            sp += 2;
+         else          /* Skip initial channels and, for sp, the filler */
+            sp += 8, dp += 6;
+
+         while (sp < ep)
+         {
+            /* Copy 6 bytes, skip 2 */
+            *dp++ = *sp++, *dp++ = *sp++;
+            *dp++ = *sp++, *dp++ = *sp++;
+            *dp++ = *sp++, *dp++ = *sp, sp += 3;
+         }
+
+         row_info->pixel_depth = 48;
+      }
+
+      else
+         return; /* bad bit depth */
+
+      row_info->channels = 3;
+
+      /* Finally fix the color type if it records an alpha channel */
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+         row_info->color_type = PNG_COLOR_TYPE_RGB;
+   }
+
+   else
+      return; /* The filler channel has gone already */
+
+   /* Fix the rowbytes value. */
+   row_info->rowbytes = dp-row;
 }
 #endif

@@ -566,8 +547,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 {
   png_debug(1, "in png_do_bgr");

-   if (
-       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   if ((row_info->color_type & PNG_COLOR_MASK_COLOR))
   {
      png_uint_32 row_width = row_info->width;
      if (row_info->bit_depth == 8)
@@ -584,6 +564,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
               *(rp + 2) = save;
            }
         }
+
         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
         {
            png_bytep rp;
@@ -597,6 +578,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
            }
         }
      }
+
+#ifdef PNG_16BIT_SUPPORTED
      else if (row_info->bit_depth == 16)
      {
         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
@@ -614,6 +597,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
               *(rp + 5) = save;
            }
         }
+
         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
         {
            png_bytep rp;
@@ -630,12 +614,14 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
            }
         }
      }
+#endif
   }
 }
 #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */

 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#ifdef PNG_USER_TRANSFORM_PTR_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)
@@ -644,15 +630,9 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp

   if (png_ptr == NULL)
      return;
-#ifdef 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

@@ -661,15 +641,38 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
 * associated with this pointer before png_write_destroy and png_read_destroy
 * are called.
 */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 png_voidp PNGAPI
-png_get_user_transform_ptr(png_structp png_ptr)
+png_get_user_transform_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+
   return ((png_voidp)png_ptr->user_transform_ptr);
-#else
-   return (NULL);
-#endif
 }
+#endif
+
+#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
+png_uint_32 PNGAPI
+png_get_current_row_number(png_const_structp png_ptr)
+{
+   /* See the comments in png.h - this is the sub-image row when reading and
+    * interlaced image.
+    */
+   if (png_ptr != NULL)
+      return png_ptr->row_number;
+
+   return PNG_UINT_32_MAX; /* help the app not to fail silently */
+}
+
+png_byte PNGAPI
+png_get_current_pass_number(png_const_structp png_ptr)
+{
+   if (png_ptr != NULL)
+      return png_ptr->pass;
+   return 8; /* invalid */
+}
+#endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */
+#endif /* PNG_READ_USER_TRANSFORM_SUPPORTED ||
+          PNG_WRITE_USER_TRANSFORM_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,8 +1,8 @@

 /* pngwio.c - functions for data output
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -30,10 +30,12 @@
 */

 void /* PRIVATE */
-png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length)
 {
+   /* NOTE: write_data_fn must not change the buffer! */
   if (png_ptr->write_data_fn != NULL )
-      (*(png_ptr->write_data_fn))(png_ptr, data, length);
+      (*(png_ptr->write_data_fn))(png_ptr, (png_bytep)data, length);
+
   else
      png_error(png_ptr, "Call to NULL write function");
 }
@@ -48,11 +50,13 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 void PNGCBAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_uint_32 check;
+   png_size_t check;

   if (png_ptr == NULL)
      return;
+
   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+
   if (check != length)
      png_error(png_ptr, "Write Error");
 }
@@ -74,24 +78,29 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)

   if (png_ptr == NULL)
      return;
+
   /* Check if data really is near. If so, use usual code. */
   near_data = (png_byte *)CVT_PTR_NOCHECK(data);
   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+
   if ((png_bytep)near_data == data)
   {
      check = fwrite(near_data, 1, length, io_ptr);
   }
+
   else
   {
      png_byte buf[NEAR_BUF_SIZE];
      png_size_t written, remaining, err;
      check = 0;
      remaining = length;
+
      do
      {
         written = MIN(NEAR_BUF_SIZE, remaining);
         png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
         err = fwrite(buf, 1, written, io_ptr);
+
         if (err != written)
            break;

@@ -103,6 +112,7 @@ 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");
 }
@@ -127,8 +137,10 @@ void PNGCBAPI
 png_default_flush(png_structp png_ptr)
 {
   png_FILE_p io_ptr;
+
   if (png_ptr == NULL)
      return;
+
   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
   fflush(io_ptr);
 }
@@ -154,7 +166,7 @@ png_default_flush(png_structp png_ptr)
 *                 arguments a pointer to a png_struct.  After a call to
 *                 the flush function, there should be no data in any buffers
 *                 or pending transmission.  If the output method doesn't do
- *                 any buffering of ouput, a function prototype must still be
+ *                 any buffering of output, a function prototype must still be
 *                 supplied although it doesn't have to do anything.  If
 *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
 *                 time, output_flush_fn will be ignored, although it must be
@@ -185,11 +197,13 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,

 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 #  ifdef PNG_STDIO_SUPPORTED
+
   if (output_flush_fn != NULL)
      png_ptr->output_flush_fn = output_flush_fn;

   else
      png_ptr->output_flush_fn = png_default_flush;
+
 #  else
   png_ptr->output_flush_fn = output_flush_fn;
 #  endif
@@ -199,6 +213,7 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
   if (png_ptr->read_data_fn != NULL)
   {
      png_ptr->read_data_fn = NULL;
+
      png_warning(png_ptr,
          "Can't set both read_data_fn and write_data_fn in the"
          " same structure");
--- a/pngwrite.c
+++ b/pngwrite.c
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,8 +1,8 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * Last changed in libpng 1.5.0 [April 18, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.6 [November 3, 2011]
+ * Copyright (c) 1998-2011 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.)
 *
@@ -15,11 +15,12 @@

 #ifdef PNG_WRITE_SUPPORTED

+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
 /* Transform the data according to the user's wishes.  The order of
 * transformations is significant.
 */
 void /* PRIVATE */
-png_do_write_transformations(png_structp png_ptr)
+png_do_write_transformations(png_structp png_ptr, png_row_infop row_info)
 {
   png_debug(1, "in png_do_write_transformations");

@@ -29,56 +30,65 @@ png_do_write_transformations(png_structp png_ptr)
 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
   if (png_ptr->transformations & PNG_USER_TRANSFORM)
      if (png_ptr->write_user_transform_fn != NULL)
-        (*(png_ptr->write_user_transform_fn)) /* User write transform
+         (*(png_ptr->write_user_transform_fn)) /* User write transform
                                                 function */
-            (png_ptr,                    /* png_ptr */
-            &(png_ptr->row_info),           /* row_info: */
-               /*  png_uint_32 width;       width of row */
-               /*  png_uint_32 rowbytes;    number of bytes in row */
-               /*  png_byte color_type;     color type of pixels */
-               /*  png_byte bit_depth;      bit depth of samples */
-               /*  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 */
+             (png_ptr,  /* png_ptr */
+             row_info,  /* row_info: */
+                /*  png_uint_32 width;       width of row */
+                /*  png_size_t rowbytes;     number of bytes in row */
+                /*  png_byte color_type;     color type of pixels */
+                /*  png_byte bit_depth;      bit depth of samples */
+                /*  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 */
 #endif
+
 #ifdef PNG_WRITE_FILLER_SUPPORTED
   if (png_ptr->transformations & PNG_FILLER)
-      png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
-          png_ptr->flags);
+      png_do_strip_channel(row_info, png_ptr->row_buf + 1,
+         !(png_ptr->flags & PNG_FLAG_FILLER_AFTER));
 #endif
+
 #ifdef PNG_WRITE_PACKSWAP_SUPPORTED
   if (png_ptr->transformations & PNG_PACKSWAP)
-      png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_packswap(row_info, png_ptr->row_buf + 1);
 #endif
+
 #ifdef PNG_WRITE_PACK_SUPPORTED
   if (png_ptr->transformations & PNG_PACK)
-      png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
+      png_do_pack(row_info, png_ptr->row_buf + 1,
          (png_uint_32)png_ptr->bit_depth);
 #endif
+
 #ifdef PNG_WRITE_SWAP_SUPPORTED
   if (png_ptr->transformations & PNG_SWAP_BYTES)
-      png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_swap(row_info, png_ptr->row_buf + 1);
 #endif
+
 #ifdef PNG_WRITE_SHIFT_SUPPORTED
   if (png_ptr->transformations & PNG_SHIFT)
-      png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
+      png_do_shift(row_info, png_ptr->row_buf + 1,
          &(png_ptr->shift));
 #endif
+
 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
   if (png_ptr->transformations & PNG_SWAP_ALPHA)
-      png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1);
 #endif
+
 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
   if (png_ptr->transformations & PNG_INVERT_ALPHA)
-      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1);
 #endif
+
 #ifdef PNG_WRITE_BGR_SUPPORTED
   if (png_ptr->transformations & PNG_BGR)
-      png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_bgr(row_info, png_ptr->row_buf + 1);
 #endif
+
 #ifdef PNG_WRITE_INVERT_SUPPORTED
   if (png_ptr->transformations & PNG_INVERT_MONO)
-      png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
+      png_do_invert(row_info, png_ptr->row_buf + 1);
 #endif
 }

@@ -113,9 +123,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
            {
               if (*sp != 0)
                  v |= mask;
+
               sp++;
+
               if (mask > 1)
                  mask >>= 1;
+
               else
               {
                  mask = 0x80;
@@ -124,10 +137,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
                  v = 0;
               }
            }
+
            if (mask != 0x80)
               *dp = (png_byte)v;
+
            break;
         }
+
         case 2:
         {
            png_bytep sp, dp;
@@ -139,12 +155,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
            dp = row;
            shift = 6;
            v = 0;
+
            for (i = 0; i < row_width; i++)
            {
               png_byte value;

               value = (png_byte)(*sp & 0x03);
               v |= (value << shift);
+
               if (shift == 0)
               {
                  shift = 6;
@@ -152,14 +170,19 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
                  dp++;
                  v = 0;
               }
+
               else
                  shift -= 2;
+
               sp++;
            }
+
            if (shift != 6)
               *dp = (png_byte)v;
+
            break;
         }
+
         case 4:
         {
            png_bytep sp, dp;
@@ -171,6 +194,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
            dp = row;
            shift = 4;
            v = 0;
+
            for (i = 0; i < row_width; i++)
            {
               png_byte value;
@@ -185,16 +209,23 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
                  dp++;
                  v = 0;
               }
+
               else
                  shift -= 4;

               sp++;
            }
+
            if (shift != 4)
               *dp = (png_byte)v;
+
            break;
         }
+
+         default:
+            break;
      }
+
      row_info->bit_depth = (png_byte)bit_depth;
      row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
@@ -212,12 +243,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 * data to 0 to 15.
 */
 void /* PRIVATE */
-png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
+png_do_shift(png_row_infop row_info, png_bytep row,
+    png_const_color_8p bit_depth)
 {
   png_debug(1, "in png_do_shift");

-   if (
-      row_info->color_type != PNG_COLOR_TYPE_PALETTE)
+   if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
   {
      int shift_start[4], shift_dec[4];
      int channels = 0;
@@ -227,19 +258,23 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
         shift_start[channels] = row_info->bit_depth - bit_depth->red;
         shift_dec[channels] = bit_depth->red;
         channels++;
+
         shift_start[channels] = row_info->bit_depth - bit_depth->green;
         shift_dec[channels] = bit_depth->green;
         channels++;
+
         shift_start[channels] = row_info->bit_depth - bit_depth->blue;
         shift_dec[channels] = bit_depth->blue;
         channels++;
      }
+
      else
      {
         shift_start[channels] = row_info->bit_depth - bit_depth->gray;
         shift_dec[channels] = bit_depth->gray;
         channels++;
      }
+
      if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
      {
         shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
@@ -251,14 +286,16 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
      if (row_info->bit_depth < 8)
      {
         png_bytep bp = row;
-         png_uint_32 i;
+         png_size_t i;
         png_byte mask;
-         png_uint_32 row_bytes = row_info->rowbytes;
+         png_size_t row_bytes = row_info->rowbytes;

         if (bit_depth->gray == 1 && row_info->bit_depth == 2)
            mask = 0x55;
+
         else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
            mask = 0x11;
+
         else
            mask = 0xff;

@@ -269,15 +306,18 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)

            v = *bp;
            *bp = 0;
+
            for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
            {
               if (j > 0)
                  *bp |= (png_byte)((v << j) & 0xff);
+
               else
                  *bp |= (png_byte)((v >> (-j)) & mask);
            }
         }
      }
+
      else if (row_info->bit_depth == 8)
      {
         png_bytep bp = row;
@@ -293,15 +333,18 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)

            v = *bp;
            *bp = 0;
+
            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
            {
               if (j > 0)
                  *bp |= (png_byte)((v << j) & 0xff);
+
               else
                  *bp |= (png_byte)((v >> (-j)) & 0xff);
            }
         }
      }
+
      else
      {
         png_bytep bp;
@@ -316,10 +359,12 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)

            v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
            value = 0;
+
            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
            {
               if (j > 0)
                  value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
+
               else
                  value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
            }
@@ -346,6 +391,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
            png_bytep sp, dp;
            png_uint_32 i;
            png_uint_32 row_width = row_info->width;
+
            for (i = 0, sp = dp = row; i < row_width; i++)
            {
               png_byte save = *(sp++);
@@ -355,6 +401,8 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save;
            }
         }
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This converts from AARRGGBB to RRGGBBAA */
@@ -377,7 +425,9 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save[1];
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
+
      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
      {
         if (row_info->bit_depth == 8)
@@ -394,6 +444,8 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save;
            }
         }
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This converts from AAGG to GGAA */
@@ -412,6 +464,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = save[1];
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
   }
 }
@@ -432,6 +485,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
            png_bytep sp, dp;
            png_uint_32 i;
            png_uint_32 row_width = row_info->width;
+
            for (i = 0, sp = dp = row; i < row_width; i++)
            {
               /* Does nothing
@@ -443,6 +497,8 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This inverts the alpha channel in RRGGBBAA */
@@ -465,7 +521,9 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
+
      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
      {
         if (row_info->bit_depth == 8)
@@ -481,6 +539,8 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
         else
         {
            /* This inverts the alpha channel in GGAA */
@@ -499,10 +559,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
               *(dp++) = (png_byte)(255 - *(sp++));
            }
         }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
      }
   }
 }
 #endif
+#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */

 #ifdef PNG_MNG_FEATURES_SUPPORTED
 /* Undoes intrapixel differencing  */
@@ -511,8 +573,7 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
 {
   png_debug(1, "in png_do_write_intrapixel");

-   if (
-       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   if ((row_info->color_type & PNG_COLOR_MASK_COLOR))
   {
      int bytes_per_pixel;
      png_uint_32 row_width = row_info->width;
@@ -523,8 +584,10 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)

         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;

@@ -534,6 +597,8 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
            *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff);
         }
      }
+
+#ifdef PNG_WRITE_16BIT_SUPPORTED
      else if (row_info->bit_depth == 16)
      {
         png_bytep rp;
@@ -541,8 +606,10 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)

         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;

@@ -559,6 +626,7 @@ png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
            *(rp + 5) = (png_byte)(blue & 0xff);
         }
      }
+#endif /* PNG_WRITE_16BIT_SUPPORTED */
   }
 }
 #endif /* PNG_MNG_FEATURES_SUPPORTED */
--- a/pngwutil.c
+++ b/pngwutil.c
--- a/Show More
+++ b/Show More