[devel] Updated documentation about libpng-1.2 to 1.4 differences.

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.4.0rc06 - December 29, 2009
+Libpng 1.4.0rc07 - December 30, 2009
 
 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.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.4.0rc06.tar.xz (LZMA-compressed, recommended)
+   1.4.0rc07.tar.xz (LZMA-compressed, recommended)
-   1.4.0rc06.tar.gz
+   1.4.0rc07.tar.gz
-   1.4.0rc06.tar.bz2
+   1.4.0rc07.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp140r06.zip
+   lp140r07.zip
-   lp140r06.7z
+   lp140r07.7z
 
 Other information:
 
-   1.4.0rc06-README.txt
+   1.4.0rc07-README.txt
-   1.4.0rc06-LICENSE.txt
+   1.4.0rc07-LICENSE.txt
 
 Changes since the last public release (1.2.10):
 
@@ -759,7 +759,10 @@ version 1.4.0rc06 [December 29, 2009]
   Reverted the gamma_table changes from libpng-1.4.0beta109.
   Fixed some indentation errors.
 
-version 1.4.0 [December 29, 2009]
+version 1.4.0rc07 [December 30, 2009]
+  Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
+
+version 1.4.0 [December 30, 2009]
   No changes.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net

CHANGES

@@ -2446,7 +2446,10 @@ version 1.4.0rc06 [December 29, 2009]
   Reverted the gamma_table changes from libpng-1.4.0beta109.
   Fixed some indentation errors.
 
-version 1.4.0 [December 29, 2009]
+version 1.4.0rc07 [December 30, 2009]
+  Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
+
+version 1.4.0 [December 30, 2009]
   No changes.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net

libpng-1.4.0rc06.txt

@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.4.0rc06 - December 29, 2009
+ libpng version 1.4.0rc07 - December 30, 2009
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.4.0rc06 - December 29, 2009
+ libpng versions 0.97, January 1998, through 1.4.0rc07 - December 30, 2009
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -878,7 +878,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.4.0rc06, not all possible expansions are supported.
+As of libpng version 1.4.0rc07, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -2999,20 +2999,6 @@ IX.  Changes to Libpng from version 1.0.x/1.2.x to 1.4.x
 Private libpng prototypes and macro definitions were moved from
 png.h and pngconf.h into a new pngpriv.h header file.
 
-Support for global arrays was removed.
-
-Some obsolete/deprecated macros and functions have been removed.
-
-Typecasted NULL definitions such as
-   #define png_voidp_NULL            (png_voidp)NULL
-were eliminated.  If you used these in your application, just use
-NULL instead.
-
-The obsolete, unused pnggccrd.c and pngvcrd.c files and related makefiles
-%were removed.
-
-The PNG_1_0_X and PNG_1_2_X macros were eliminated.
-
 Functions png_set_benign_errors(), png_benign_error(), and
 png_chunk_benign_error() were added.
 
@@ -3024,23 +3010,28 @@ were added to the library.
 We implemented support for I/O states by adding png_ptr member io_state
 and functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
 
-The png_calloc() function was added and is used in place of
-of "png_malloc(); png_memset();" except in the case in png_read_png()
-where the array consists of pointers; in this case a "for" loop is used
-after the png_malloc() to set the pointers to NULL.
-
 We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level
 input transforms.
 
-The call to png_do_chop() in pngrtran.c, which reduces 16-bit input
-files to 8-bit bit depth, was relocated ahead of the building
-of gamma tables.  This allows us to build 8-bit tables instead
-of 16-bit tables, when only 8-bit tables are needed. This avoids 
-wasting some computing resources when the application has called
-the png_set_strip_16() function and encounters a 16-bit PNG file.
-
 Checking for and reporting of errors in the IHDR chunk is more thorough.
 
+Support for global arrays was removed, to improve thread safety.
+
+Some obsolete/deprecated macros and functions have been removed.
+
+Typecasted NULL definitions such as
+   #define png_voidp_NULL            (png_voidp)NULL
+were eliminated.  If you used these in your application, just use
+NULL instead.
+
+The png_struct and info_struct members "trans" and "trans_values" were
+changed to "trans_alpha" and "trans_color", respectively.
+
+The obsolete, unused pnggccrd.c and pngvcrd.c files and related makefiles
+%were removed.
+
+The PNG_1_0_X and PNG_1_2_X macros were eliminated.
+
 The PNG_LEGACY_SUPPORTED macro was eliminated.
 
 Many WIN32_WCE #ifdefs were removed.
@@ -3049,10 +3040,6 @@ The functions png_read_init(info_ptr), png_write_init(info_ptr),
 png_info_init(info_ptr), png_read_destroy(), and png_write_destroy()
 have been removed.  They have been deprecated since libpng-0.95.
 
-Support for numbered error messages was removed by default, since we
-never got around to actually numbering the error messages. The function
-png_set_strip_error_numbers() was removed from the library by default.
-
 The png_permit_empty_plte() was removed. It has been deprecated
 since libpng-1.0.9.  Use png_permit_mng_features() instead.
 
@@ -3061,28 +3048,36 @@ png_set_mmx_thresholds(), png_get_asm_flags(),
 png_get_mmx_bitdepth_threshold(), png_get_mmx_rowbytes_threshold(),
 png_set_asm_flags(), and png_mmx_supported()
 
-We removed the png_check_sig(), png_memcpy_check(), and
+We removed the obsolete png_check_sig(), png_memcpy_check(), and
-png_memset_check() functions.
+png_memset_check() functions.  Instead use !png_sig_cmp(), png_memcpy(),
+and png_memset(), respectively.
 
 We changed the prototype for png_malloc() from
     png_malloc(png_structp png_ptr, png_uint_32 size)
 to
     png_malloc(png_structp png_ptr, png_alloc_size_t size)
 
+The png_calloc() function was added and is used in place of
+of "png_malloc(); png_memset();" except in the case in png_read_png()
+where the array consists of pointers; in this case a "for" loop is used
+after the png_malloc() to set the pointers to NULL, to give robust.
+behavior in case the application runs out of memory part-way through
+the process.
+
 We changed the prototypes of png_get_compression_buffer_size() and
 png_set_compression_buffer_size() to work with png_size_t instead of
 png_uint_32.
 
+Support for numbered error messages was removed by default, since we
+never got around to actually numbering the error messages. The function
+png_set_strip_error_numbers() was removed from the library by default.
+
+The png_zalloc() and png_zfree() functions are no longer exported.
 The png_zalloc() function no longer zeroes out the memory that it
 allocates.
 
-The png_zalloc() and png_zfree() functions are no longer exported.
-
 We removed the trailing '.' from the warning and error messages.
 
-The png_struct and info_struct members "trans" and "trans_values" were
-changed to "trans_alpha" and "trans_color", respectively.
-
 X. Detecting libpng
 
 The png_get_io_ptr() function has been present since libpng-0.88, has never
@@ -3221,13 +3216,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIII. Y2K Compliance in libpng
 
-December 29, 2009
+December 30, 2009
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.4.0rc06 are Y2K compliant.  It is my belief that earlier
+upward through 1.4.0rc07 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "December 29, 2009"
+.TH LIBPNG 3 "December 30, 2009"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.4.0rc06
+libpng \- Portable Network Graphics (PNG) Reference Library 1.4.0rc07
 .SH SYNOPSIS
 \fI\fB
 
@@ -777,7 +777,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.4.0rc06 - December 29, 2009
+ libpng version 1.4.0rc07 - December 30, 2009
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
@@ -788,7 +788,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.4.0rc06 - December 29, 2009
+ libpng versions 0.97, January 1998, through 1.4.0rc07 - December 30, 2009
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
@@ -1655,7 +1655,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.4.0rc06, not all possible expansions are supported.
+As of libpng version 1.4.0rc07, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3776,20 +3776,6 @@ which does not. It has been deprecated since libpng-1.0.18 and 1.2.9.
 Private libpng prototypes and macro definitions were moved from
 png.h and pngconf.h into a new pngpriv.h header file.
 
-Support for global arrays was removed.
-
-Some obsolete/deprecated macros and functions have been removed.
-
-Typecasted NULL definitions such as
-   #define png_voidp_NULL            (png_voidp)NULL
-were eliminated.  If you used these in your application, just use
-NULL instead.
-
-The obsolete, unused pnggccrd.c and pngvcrd.c files and related makefiles
-%were removed.
-
-The PNG_1_0_X and PNG_1_2_X macros were eliminated.
-
 Functions png_set_benign_errors(), png_benign_error(), and
 png_chunk_benign_error() were added.
 
@@ -3801,23 +3787,28 @@ were added to the library.
 We implemented support for I/O states by adding png_ptr member io_state
 and functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
 
-The png_calloc() function was added and is used in place of
-of "png_malloc(); png_memset();" except in the case in png_read_png()
-where the array consists of pointers; in this case a "for" loop is used
-after the png_malloc() to set the pointers to NULL.
-
 We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level
 input transforms.
 
-The call to png_do_chop() in pngrtran.c, which reduces 16-bit input
-files to 8-bit bit depth, was relocated ahead of the building
-of gamma tables.  This allows us to build 8-bit tables instead
-of 16-bit tables, when only 8-bit tables are needed. This avoids 
-wasting some computing resources when the application has called
-the png_set_strip_16() function and encounters a 16-bit PNG file.
-
 Checking for and reporting of errors in the IHDR chunk is more thorough.
 
+Support for global arrays was removed, to improve thread safety.
+
+Some obsolete/deprecated macros and functions have been removed.
+
+Typecasted NULL definitions such as
+   #define png_voidp_NULL            (png_voidp)NULL
+were eliminated.  If you used these in your application, just use
+NULL instead.
+
+The png_struct and info_struct members "trans" and "trans_values" were
+changed to "trans_alpha" and "trans_color", respectively.
+
+The obsolete, unused pnggccrd.c and pngvcrd.c files and related makefiles
+%were removed.
+
+The PNG_1_0_X and PNG_1_2_X macros were eliminated.
+
 The PNG_LEGACY_SUPPORTED macro was eliminated.
 
 Many WIN32_WCE #ifdefs were removed.
@@ -3826,10 +3817,6 @@ The functions png_read_init(info_ptr), png_write_init(info_ptr),
 png_info_init(info_ptr), png_read_destroy(), and png_write_destroy()
 have been removed.  They have been deprecated since libpng-0.95.
 
-Support for numbered error messages was removed by default, since we
-never got around to actually numbering the error messages. The function
-png_set_strip_error_numbers() was removed from the library by default.
-
 The png_permit_empty_plte() was removed. It has been deprecated
 since libpng-1.0.9.  Use png_permit_mng_features() instead.
 
@@ -3838,28 +3825,36 @@ png_set_mmx_thresholds(), png_get_asm_flags(),
 png_get_mmx_bitdepth_threshold(), png_get_mmx_rowbytes_threshold(),
 png_set_asm_flags(), and png_mmx_supported()
 
-We removed the png_check_sig(), png_memcpy_check(), and
+We removed the obsolete png_check_sig(), png_memcpy_check(), and
-png_memset_check() functions.
+png_memset_check() functions.  Instead use !png_sig_cmp(), png_memcpy(),
+and png_memset(), respectively.
 
 We changed the prototype for png_malloc() from
     png_malloc(png_structp png_ptr, png_uint_32 size)
 to
     png_malloc(png_structp png_ptr, png_alloc_size_t size)
 
+The png_calloc() function was added and is used in place of
+of "png_malloc(); png_memset();" except in the case in png_read_png()
+where the array consists of pointers; in this case a "for" loop is used
+after the png_malloc() to set the pointers to NULL, to give robust.
+behavior in case the application runs out of memory part-way through
+the process.
+
 We changed the prototypes of png_get_compression_buffer_size() and
 png_set_compression_buffer_size() to work with png_size_t instead of
 png_uint_32.
 
+Support for numbered error messages was removed by default, since we
+never got around to actually numbering the error messages. The function
+png_set_strip_error_numbers() was removed from the library by default.
+
+The png_zalloc() and png_zfree() functions are no longer exported.
 The png_zalloc() function no longer zeroes out the memory that it
 allocates.
 
-The png_zalloc() and png_zfree() functions are no longer exported.
-
 We removed the trailing '.' from the warning and error messages.
 
-The png_struct and info_struct members "trans" and "trans_values" were
-changed to "trans_alpha" and "trans_color", respectively.
-
 .SH X. Detecting libpng
 
 The png_get_io_ptr() function has been present since libpng-0.88, has never
@@ -3998,13 +3993,13 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIII. Y2K Compliance in libpng
 
-December 29, 2009
+December 30, 2009
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.4.0rc06 are Y2K compliant.  It is my belief that earlier
+upward through 1.4.0rc07 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -4232,7 +4227,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.4.0rc06 - December 29, 2009:
+Libpng version 1.4.0rc07 - December 30, 2009:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -4255,7 +4250,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.4.0rc06, December 29, 2009, are
+libpng versions 1.2.6, August 15, 2004, through 1.4.0rc07, December 30, 2009, are
 Copyright (c) 2004,2006-2007 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
@@ -4354,7 +4349,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-December 29, 2009
+December 30, 2009
 
 .\" end of man page