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[libpng16] Made progressive reading of interlaced images consistent with the

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behavior of the sequential reader and consistent with the manual. The
row_callback now receives the proper pass number and unexpanded rows,
when png_combine_row is not used or not built, by moving some code
out of the PNG_READ_INTERLACING_SUPPORTED blocks.
This commit is contained in:
Glenn Randers-Pehrson
2014-04-13 21:27:25 -05:00
parent 9f1aa186e6
commit 72855fb11e
8 changed files with 44 additions and 50 deletions
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18
libpng-manual.txt
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@@ -1,6 +1,6 @@
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.6.11beta04 - April 6, 2014
libpng version 1.6.11beta04 - April 13, 2014
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.6.11beta04 - April 6, 2014
libpng versions 0.97, January 1998, through 1.6.11beta04 - April 13, 2014
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -5076,16 +5076,16 @@ Libpng-1.6.0 through 1.6.2 used the CMF bytes at the beginning of the IDAT
stream to set the size of the sliding window for reading instead of using the
default 32-kbyte sliding window size. It was discovered that there are
hundreds of PNG files in the wild that have incorrect CMF bytes that caused
libpng to issue a "too far back" error and reject the file. Libpng-1.6.3 and
later calculate their own safe CMF from the image dimensions, provide a way
to revert to the libpng-1.5.x behavior (ignoring the CMF bytes and using a
32-kbyte sliding window), by using
zlib to issue the "invalid distance too far back" error and reject the file.
Libpng-1.6.3 and later calculate their own safe CMF from the image dimensions,
provide a way to revert to the libpng-1.5.x behavior (ignoring the CMF bytes
and using a 32-kbyte sliding window), by using
png_set_option(png_ptr, PNG_MAXIMUM_INFLATE_WINDOW,
PNG_OPTION_ON);
and provide a tool (contrib/tools/pngfix) for optimizing the CMF bytes
correctly.
and provide a tool (contrib/tools/pngfix) for rewriting a PNG file while
optimizing the CMF bytes in its IDAT chunk correctly.
Libpng-1.6.0 and libpng-1.6.1 wrote uncompressed iTXt chunks with the wrong
length, which resulted in PNG files that cannot be read beyond the bad iTXt
@@ -5261,7 +5261,7 @@ Other rules can be inferred by inspecting the libpng source.
XVI. Y2K Compliance in libpng
April 6, 2014
April 13, 2014
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.