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[master] 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 08:33:46 -05:00
parent e14fdbbddb
commit f2609e133d
2 changed files with 25 additions and 17 deletions
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@ -1179,7 +1179,7 @@ version 1.2.4beta3 [June 28, 2002]
Plugged memory leak of row_buf in pngtest.c when there is a png_error().
Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
Added "test-installed" target to makefile.32sunu, makefile.64sunu,
makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
Added "test-installed" target to makefile.cygwin and makefile.sco.
@ -1387,7 +1387,7 @@ version 1.2.8beta5 [November 20, 2004]
Use png_ptr->flags instead of png_ptr->transformations to pass
PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
compatibility.
Revised handling of SPECIALBUILD, PRIVATEBUILD,
Revised handling of SPECIALBUILD, PRIVATEBUILD,
PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
version 1.2.8rc1 [November 24, 2004]
Moved handling of BUILD macros from pngconf.h to png.h
@ -1685,14 +1685,14 @@ version 1.2.16beta1 [January 6, 2007]
version 1.2.16beta2 [January 16, 2007]
Revised scripts/CMakeLists.txt
version 1.0.24, 1.2.16 [January 31, 2007]
No changes.
version 1.2.17beta1 [March 6, 2007]
Revised scripts/CMakeLists.txt to install both shared and static libraries.
Deleted a redundant line from pngset.c.
version 1.2.17beta2 [April 26, 2007]
Relocated misplaced test for png_ptr == NULL in pngpread.c
Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
@ -1713,7 +1713,7 @@ version 1.2.17rc2 [May 8, 2007]
Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
can be free'ed in case of error. Revised unknown chunk handling in
pngrutil.c and pngpread.c to use this structure.
version 1.2.17rc3 [May 8, 2007]
Revised symbol-handling in configure script.
@ -2389,21 +2389,24 @@ version 1.2.37beta03 [May 20, 2009]
is only one makefile in those directories, and revised the README files
accordingly.
Reformated sources in libpng style (3-space indentation, comment format)
version 1.2.37rc01 [May 27, 2009]
No changes.
versions 1.2.37 and 1.0.45 [June 4, 2009]
Reformatted several remaining "else statement;" and "if () statment;" into
Reformatted several remaining "else statement;" and "if () statement;" into
two lines.
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
Added sections about the git repository and our coding style to the
documentation (merged from libpng-1.4.0beta62)
Added a section about using png_get_io_ptr() in configure scripts to detect
the presence of libpng.
Added a section to the libpng documentation about using png_get_io_ptr()
in configure scripts to detect the presence of libpng.
versions 1.2.38 [June 5, 2009]
versions 1.2.38 [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.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

17
libpng-1.2.38beta01.txt
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@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.2.38beta01 - June 5, 2009
libpng version 1.2.38beta01 - June 8, 2009
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -9,7 +9,7 @@ libpng.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.2.38beta01 - June 5, 2009
libpng versions 0.97, January 1998, through 1.2.38beta01 - June 8, 2009
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2009 Glenn Randers-Pehrson
@ -1817,6 +1817,10 @@ other png_set_*() functions, which might require access to some of
the IHDR settings. The remaining png_set_*() functions can be called
in any order.
If you wish, you can reset the compression_type, interlace_type, or
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,
num_palette);
palette - the palette for the file
@ -1878,8 +1882,9 @@ in any order.
trans_values);
trans - array of transparent entries for
palette (PNG_INFO_tRNS)
trans_values - graylevel or color sample values of
the single transparent color for
trans_values - graylevel or color sample values
(in order red, green, blue) of the
single transparent color for
non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries
(PNG_INFO_tRNS)
@ -3016,7 +3021,7 @@ We don't use C++ style ("//") comments. We have, however,
used them in the past in some now-abandoned MMX assembler
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:
/* This is a public function that is visible to
@ -3060,7 +3065,7 @@ source.
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
an official declaration.