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30 Commits

Author SHA1 Message Date
Glenn Randers-Pehrson
39fee3cee1 [libpng17] Fixed a large number of instances where PNGCBAPI was omitted from 
function definitions.
 2014-01-31 21:55:27 -06:00
Glenn Randers-Pehrson
28711dff2a [libpng17] Updated copyright year in recently-changed files. 2013-12-31 21:15:11 -06:00
Glenn Randers-Pehrson
200fc68f52 [libpng17] Removed #error macro from contrib/tools/pngfix.c (Thomas Klausner). 2013-12-27 20:18:50 -06:00
Glenn Randers-Pehrson
9e168ea2c9 [libpng17] Merged files with version 1.6.8 that have not changed since then. 2013-12-19 20:33:08 -06:00
John Bowler
5a1b8d106d [libpng17] Tidied up pngfix inits and fixed pngtest no-write builds. 2013-12-01 15:50:03 -06:00
Glenn Randers-Pehrson
a199a15b28 [libpng17] Added another "assert()" to pngfix.c 2013-11-23 12:58:32 -06:00
Glenn Randers-Pehrson
e9446f2f95 [libpng17] Added an "assert()" to pngfix.c to quiet a clang scanner warning. 2013-11-23 12:14:02 -06:00
John Bowler
7e2707e2af [libpng17] Ported recent changes from libpng16 to libpng17 
Fixed 'minimal' builds. Various obviously useful minimal configurations
  don't build because of missing contrib/libtests test programs and overly
  complex dependencies in scripts/pnglibconf.dfa. This change adds
  contrib/conftest/*.dfa files that can be used in automatic build
  scripts to ensure that these configurations continue to build.
Enabled WRITE_INVERT and WRITE_PACK in contrib/pngminim/encoder.
 2013-11-22 18:01:30 -06:00
John Bowler
9f2fbcf5d8 [libpng17] Fixed #include in filter_neon_intrinsics.c and ctype macros. The 
ctype char checking macros take an unsigned char argument, not a signed char.
 2013-11-04 13:50:20 -06:00
John Bowler
32aeb2cd4e [libpng17] Cleaned up (char*) casts of zlib messages. The latest version 
of the Intel C compiler complains about casting a string literal as (char*),
so copied the treatment of z_const from the library code into pngfix.c
 2013-10-06 08:47:43 -05:00
John Bowler
7657ac14f2 [libpng17] Catch up with recent libpng16 changes; unknown handling and spelling 
corrections
 2013-09-30 11:18:13 -05:00
John Bowler
23f3e46518 [libpng17] Ported pngfix.c patches from libpng16. 2013-07-03 07:50:24 -05:00
John Bowler
23f4320775 [libpng17] Added perfect hash code generation for lists of PNG chunks. This is 
a work in progress; checked in for use in pngfix.c
 2013-07-03 07:41:04 -05:00
Glenn Randers-Pehrson
5aa2ca454d [libpng17] Revised pngfix.c to use PNG_U32() instead of PNG_CHUNK() 2013-07-02 09:52:09 -05:00
Glenn Randers-Pehrson
7905286ffa [libpng17] Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised 
it to check all compressed chunks known to libpng.
 2013-07-01 15:11:36 -05:00
Glenn Randers-Pehrson
4a7796faca [libpng17] Imported from libpng-1.7.0beta14.tar 2013-06-08 21:00:36 -05:00
Glenn Randers-Pehrson
46ad4c5bd4 [libpng17] Deleted contrib/tools/fixitxt.c, which has been renamed. 2013-06-05 17:03:38 -05:00
John Bowler
a08ac031fc [libpng17] Fixed ICC compiler warning in tools/png-fix-itxt.c 2013-06-05 16:48:18 -05:00
Glenn Randers-Pehrson
bd56d76417 [libpng17] Port recent zlib windowBits handling from libpng-1.6.3beta06 2013-05-10 17:43:59 -05:00
Glenn Randers-Pehrson
6cf97e37af [libpng17] Bump version to 1.7.0beta08 2013-04-18 07:39:57 -05:00
Glenn Randers-Pehrson
8ef61c4693 [libpng17] Added contrib/tools/fixitxt.c, to repair the erroneous iTXt 
chunk length written by libpng-1.6.0 and 1.6.1.
 2013-04-16 23:09:35 -05:00
John Bowler
0cf9c7d63d [libpng17] Removed some duplicated code from png.c and contrib/tools/scale.c 
and changed some png_warning() calls to png_app_error() calls in pngwutil.c
 2012-12-15 16:04:28 -06:00
Glenn Randers-Pehrson
ec1d13a1d4 [libpng17] Imported from libpng-1.7.0alpha01.tar 2012-12-15 12:33:44 -06:00
John Bowler
3e42c81193 [libpng17] Made 8-bit compose and rgb_to_grayscale accuracy improvements. 
These changes cause 16-bit arithmetic to be used for 8-bit data in the gamma
    corrected compose and grayscale operations.  The arithmetic errors have
    three sources all of which are fixed in this commit:
    1) 8-bit linear calculations produce massive errors for lower intensity
       values.
    2) The old 16-bit "16 to 8" gamma table code erroneously wrote the lowest
       output value into a table entry which corresponded to multiple output
       values (so where the value written should have been the closest to the
       transformed input value.)
    3) In a number of cases the code to access the 16-bit table did not round;
       it did a simple shift, which was wrong and made the side effects of (2)
       even worse.
  The new gamma code does not have the 16-to-8 problem at the cost of slighly
    more calculations and the algorithm used to minimize the number of
    calculations has been extended to all the 16-bit tables; it has advantages
    for any significant gamma correction.
 2012-12-14 22:17:54 -06:00
Glenn Randers-Pehrson
46cb5109bd [libpng16] Moved scripts/chkfmt to contrib/tools. 2012-06-25 14:14:17 -05:00
Glenn Randers-Pehrson
96027d919f [libpng16] Imported from libpng-1.6.0beta20.tar 2012-03-29 06:38:51 -05:00
John Bowler
13a87d9682 [libpng16] Fixed ICC profile parsing and sRGB profile recognition 
and moved checksum-icc.c from contrib/libtests to contrib/tools.
 2012-03-28 09:51:43 -05:00
Glenn Randers-Pehrson
da1c5ca65a [libpng16] Imported from libpng-1.6.0beta05.tar 2012-01-14 20:44:14 -06:00
Glenn Randers-Pehrson
6bdefdd977 [libpng] Fixed some trivial typos in the contrib/tools subdirectory. 2011-11-29 07:44:48 -06:00
John Bowler
405a398b3e [libpng16] New 'tools' directory containing tools used to generate libpng code. 2011-11-28 23:57:45 -06:00