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[devel] Revise libpng*.txt

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about calling png_set_IHDR() multiple times and about the order
of color samples in the tRNS chunk.
This commit is contained in:
Glenn Randers-Pehrson 2009-06-08 08:31:59 -05:00
parent 7aa1834c95
commit 9dcde09ac8
2 changed files with 22 additions and 17 deletions
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9
CHANGES
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@ -2147,10 +2147,13 @@ version 1.4.0beta62 [June 2, 2009]
Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
Reformatted several remaining "else statement" into two lines. Reformatted several remaining "else statement" into two lines.
Added a section about using png_get_io_ptr() in configure scripts to detect Added a section to the libpng documentation about using png_get_io_ptr()
the presence of libpng. in configure scripts to detect the presence of libpng.
version 1.4.0beta63 [June 5, 2009] version 1.4.0beta63 [June 8, 2009]
Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
multiple times and to specify the sample order in the tRNS chunk,
because the ISO PNG specification has a typo in the tRNS table.
version 1.4.0betaN [future] version 1.4.0betaN [future]
Build shared libraries with -lz and sometimes -lm. Build shared libraries with -lz and sometimes -lm.

18
libpng-1.4.0beta63.txt
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@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng libpng.txt - A description on how to use and modify libpng
libpng version 1.4.0beta63 - June 5, 2009 libpng version 1.4.0beta63 - June 8, 2009
Updated and distributed by Glenn Randers-Pehrson Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net> <glennrp at users.sourceforge.net>
Copyright (c) 1998-2009 Glenn Randers-Pehrson Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -9,7 +9,7 @@ libpng.txt - A description on how to use and modify libpng
Based on: Based on:
libpng versions 0.97, January 1998, through 1.4.0beta63 - June 5, 2009 libpng versions 0.97, January 1998, through 1.4.0beta63 - June 8, 2009
Updated and distributed by Glenn Randers-Pehrson Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2009 Glenn Randers-Pehrson Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -1839,8 +1839,9 @@ other png_set_*() functions, which might require access to some of
the IHDR settings. The remaining png_set_*() functions can be called the IHDR settings. The remaining png_set_*() functions can be called
in any order. in any order.
If you wish, you can reset the compression_type, interlace_type, If you wish, you can reset the compression_type, interlace_type, or
or filter_method later. filter_method later by calling png_set_IHDR() again; if you do this, the
width, height, bit_depth, and color_type must be the same in each call.
png_set_PLTE(png_ptr, info_ptr, palette, png_set_PLTE(png_ptr, info_ptr, palette,
num_palette); num_palette);
@ -1903,8 +1904,9 @@ or filter_method later.
trans_color); trans_color);
trans - array of transparent entries for trans - array of transparent entries for
palette (PNG_INFO_tRNS) palette (PNG_INFO_tRNS)
trans_color - graylevel or color sample values of trans_color - graylevel or color sample values
the single transparent color for (in order red, green, blue) of the
single transparent color for
non-paletted images (PNG_INFO_tRNS) non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries num_trans - number of transparent entries
(PNG_INFO_tRNS) (PNG_INFO_tRNS)
@ -3117,7 +3119,7 @@ We don't use C++ style ("//") comments. We have, however,
used them in the past in some now-abandoned MMX assembler used them in the past in some now-abandoned MMX assembler
code. code.
Functions and their curly brackets are not indented, and Functions and their curly braces are not indented, and
exported functions are marked with PNGAPI: exported functions are marked with PNGAPI:
/* This is a public function that is visible to /* This is a public function that is visible to
@ -3161,7 +3163,7 @@ source.
XIII. Y2K Compliance in libpng XIII. Y2K Compliance in libpng
June 5, 2009 June 8, 2009
Since the PNG Development group is an ad-hoc body, we can't make Since the PNG Development group is an ad-hoc body, we can't make
an official declaration. an official declaration.