John Bowler
aa725a375c
[libpng16] Corrected estimate of error in libpng png_set_rgb_to_gray API.
...
The API is extremely inaccurate for sRGB conversions because it uses an 8-bit
intermediate linear value and it does not use the sRGB transform, so it
suffers from the known instability in gamma transforms for values close
to 0 (see Poynton). The net result is that the calculation has a maximum
error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the
permitted 8-bit error. This may still not be enough because of arithmetic
error.
2012-02-04 15:11:16 -06:00
John Bowler
40ca77a721
[libpng16] Improved pngstest speed by not doing redundant tests and add const
...
to the background parameter of png_image_finish_read. The --background
option is now done automagically only when required, so that commandline
option no longer exists.
2012-01-28 23:19:42 -06:00
John Bowler
3a1d63dc69
[libpng16] Fixed Image::colormap misalignment in pngstest.c
2012-01-28 00:11:53 -06:00
John Bowler
8fb6c6a9b3
[libpng16] Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
...
compiler issues slightly different warnings from those issued by the
current vesions of GCC. This eliminates those warnings by
adding/removing casts and small code rewrites.
2012-01-25 07:47:44 -06:00
John Bowler
c35f888c46
[libpng16] Finish patching pngstest.c
2012-01-24 07:40:28 -06:00
Glenn Randers-Pehrson
edbcd02133
[libpng16] bump version to 1.6.0beta06
2012-01-16 07:50:01 -06:00
Glenn Randers-Pehrson
1531bd61a0
[libpng16] Updated copyright year to 2012
2012-01-01 14:45:04 -06:00
John Bowler
d7c22fb7ec
[libpng16] Added pngvalid.c compile time checks for const APIs.
2011-12-24 08:29:20 -06:00
Glenn Randers-Pehrson
28d9339777
[libpng16] Imported from libpng-1.6.0beta03.tar
2011-12-22 08:14:43 -06:00
John Bowler
681c1fc02a
[libpng16] Correct configure builds where build and source directories are
...
separate. The include path of 'config.h' was erroneously made relative in
pngvalid.c in libpng 1.5.7.
2011-12-18 06:20:22 -06:00
John Bowler
ba6fbc57ba
[libpng16] Revised config.h handling; added bsconfig.h, deleted pngconfig.h
2011-12-17 14:21:54 -06:00
Glenn Randers-Pehrson
d1dceee2f7
[libpng] #include "pngconfig.h" in pngvalid.c
2011-12-17 10:21:51 -06:00
Glenn Randers-Pehrson
26aad85204
[libpng16] Imported from libpng-1.6.0beta01.tar
2011-12-15 10:31:17 -06:00
John Bowler
12924f33bd
[libpng16] Fixed minor memset/sizeof errors in pngvalid.c.
2011-12-05 12:36:04 -06:00
John Bowler
405a398b3e
[libpng16] New 'tools' directory containing tools used to generate libpng code.
2011-11-28 23:57:45 -06:00
John Bowler
baeb6d1e92
[libpng16] Added ANSI-C (C90) headers; eliminated the use of FAR/far.
2011-11-26 18:21:02 -06:00
Glenn Randers-Pehrson
5b79cd52f4
[libpng16] Moved pngvalid.c into contrib/libtests
...
and rebuilt Makefile.in and configure, etc., with autoconf-2.68
2011-11-24 10:56:20 -06:00
Glenn Randers-Pehrson
3b1f03084e
[libpng15] Fixed copyright, spelling in contrib/libtest and contrib/sRGBtables
2011-11-21 20:52:21 -06:00
Glenn Randers-Pehrson
e0bcbfd0fd
[libpng15] Imported from libpng-1.5.7beta03.tar
2011-11-16 23:14:06 -06:00
John Bowler
89c2f84287
[libpng15] Fix Windows builds, add pngstest to Visual Studio and OpenWatcom
2011-11-16 12:04:39 -06:00
John Bowler
ed9f84475d
[libpng15] Update pngstest to remove compiler warnings, add to libpng tests
2011-11-16 11:52:27 -06:00
John Bowler
1eb188932b
[libpng15] Added contrib/pngtests
2011-11-16 11:40:59 -06:00
