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[libpng15] Disabled part of the CMF optimization of non-IDAT compressed

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chunks, which was added at libpng-1.5.4.  It sometimes produces too small
of a window.  This has been fixed in libpng-1.6.0.
This commit is contained in:
Glenn Randers-Pehrson 2012-03-09 17:29:31 -06:00
parent 8f7fc403e5
commit 0b8b358b98
3 changed files with 11 additions and 3 deletions
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7
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.5.10beta04 - March 6, 2012 Libpng 1.5.10beta04 - March 9, 2012
This is not intended to be a public release. It will be replaced 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. within a few weeks by a public version or by another test version.
@ -50,8 +50,11 @@ Version 1.5.10beta03 [March 6, 2012]
of png_ptr->current_text from pngread.c of png_ptr->current_text from pngread.c
Added palette-index checking. Added palette-index checking.
Version 1.5.10beta04 [March 6, 2012] Version 1.5.10beta04 [March 9, 2012]
Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition. Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition.
Disabled part of the CMF optimization of non-IDAT compressed chunks, which
was added at libpng-1.5.4. It sometimes produces too small of a window.
This has been fixed in libpng-1.6.0.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net: Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
(subscription required; visit (subscription required; visit

5
CHANGES
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@ -3835,8 +3835,11 @@ Version 1.5.10beta03 [March 6, 2012]
of png_ptr->current_text from pngread.c of png_ptr->current_text from pngread.c
Added palette-index checking. Added palette-index checking.
Version 1.5.10beta04 [March 6, 2012] Version 1.5.10beta04 [March 9, 2012]
Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition. Fixed PNG_LIBPNG_BUILD_BASE_TYPE definition.
Disabled part of the CMF optimization of non-IDAT compressed chunks, which
was added at libpng-1.5.4. It sometimes produces too small of a window.
This has been fixed in libpng-1.6.0.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

2
pngwutil.c
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@ -619,6 +619,7 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
if (comp->num_output_ptr) if (comp->num_output_ptr)
{ {
#if 0 /* The following sometimes produces incorrect zlib datastreams */
if (comp->output_ptr[0][0] != z_cmf) if (comp->output_ptr[0][0] != z_cmf)
{ {
int tmp; int tmp;
@ -628,6 +629,7 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;
comp->output_ptr[0][1] = (png_byte)tmp; comp->output_ptr[0][1] = (png_byte)tmp;
} }
#endif /* 0 */
} }
else else
{ {