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Author SHA1 Message Date
Glenn Randers-Pehrson
7dffa41643 [devel] Use the old scaling method for background if png_set_chop_16() was 
called.
 2011-06-14 06:30:12 -05:00
John Bowler
550bab03fb [devel] Removed the ACCURATE and LEGACY options (they are no longer useable) 
Fixed some compiliation problems with scaling options.
 2011-06-14 06:17:26 -05:00
Glenn Randers-Pehrson
413138a5ca [devel] Added png_set_chop_16() API. 2011-06-13 22:07:37 -05:00
John Bowler
74945f2f04 [devel] Fix and clarify LEGACY 16-to-8 scaling. 2011-06-13 20:50:42 -05:00
Glenn Randers-Pehrson
97039baa88 [devel] Imported from libpng-1.5.4beta01.tar 2011-06-13 20:09:22 -05:00
Glenn Randers-Pehrson
fd73d04515 [devel] Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE 
outside of an unknown-chunk block in png.h because they are also
needed for other uses.
 2011-06-13 13:25:21 -05:00
Glenn Randers-Pehrson
141d9e3c20 [devel] Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED 
to get the same (inaccurate) output as libpng-1.5.2 and earlier.
 2011-06-13 11:47:00 -05:00
Glenn Randers-Pehrson
0cb906d804 [devel] Imported from libpng-1.5.3beta11.tar 2011-06-11 14:23:33 -05:00
Glenn Randers-Pehrson
b704036531 [devel] Allow png_set_user_limits() to increase limits as well as reduce them. 2011-06-11 14:20:22 -05:00
John Bowler
6f55ee2ec5 [devel] Added log option to pngvalid.c and attempted to improve gamma messages. 2011-06-11 07:28:06 -05:00
John Bowler
6a1dc2329a [devel] Removed string/memory macros that are no longer used 
and are not necessarily fully supportable, particularly png_strncpy and
png_snprintf.
 2011-06-11 06:58:46 -05:00
John Bowler
59a6c379dd [devel] Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. 
This allows pngvalid to build when ALPHA_MODE is not supported, which is
required if it is to build on libpng 1.4.
 2011-06-11 06:51:06 -05:00
John Bowler
d2f0bc2d13 [devel] Improved gamma range checks and other things OpenWatcom warns about. 2011-06-11 06:42:06 -05:00
John Bowler
b011fe1c12 [devel] Remove testing cruft from projects/owatcom. 2011-06-11 06:36:51 -05:00
John Bowler
0eadc27cd6 [devel] Added projects/owatcom, an IDE project for OpenWatcom to replace 
scripts/makefile.watcom.  This project works with OpenWatcom 1.9. The
    IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
    The project is configurable, unlike the Visual Studio project, so long
    as the developer has an awk.
 2011-06-11 06:31:28 -05:00
Glenn Randers-Pehrson
700c55036c [devel] Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro. 2011-06-10 23:26:03 -05:00
John Bowler
b2bee3374c [devel] Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is 
wrong (high by one) 25% of the time. Dividing by 257 with rounding is
    wrong in 128 out of 65536 cases. Getting the right answer all the time
    without division is easy.
 2011-06-10 23:24:58 -05:00
Glenn Randers-Pehrson
cc2770850a [devel] Revised documentation about png_set_user_limits() to say that it can 
only be used to reduce the defined limit, and that it also affects
png writing.
 2011-06-10 21:17:34 -05:00
Glenn Randers-Pehrson
fb27873021 [devel] Bump version to libpng-1.5.3beta11 2011-06-10 20:46:53 -05:00
Glenn Randers-Pehrson
590fb8c481 [devel] Removed #ifdef in png.c that caused sCAL handler to leak memory. 2011-06-10 20:25:49 -05:00
John Bowler
4e8d7ec5fc [devel] Added sCAL chunk to pngtest.png 2011-06-10 17:47:09 -05:00
Glenn Randers-Pehrson
254a513fd1 [devel] Fixed png_handle_sCAL which is broken in 1.5 2011-06-10 17:45:48 -05:00
Glenn Randers-Pehrson
ab1a573768 [devel] Imported from libpng-1.5.3rc03.tar 2011-06-07 19:56:51 -05:00
Glenn Randers-Pehrson
38a9d2763c [devel] Imported from libpng-1.5.3rc02.tar 2011-06-07 14:36:45 -05:00
Glenn Randers-Pehrson
07e1d34a84 [devel] Fixed 1-byte uninitialized memory reference in png_format_buffer() 
(Bug report by Frank Busse, related to CVE-2004-0421).
 2011-06-07 14:35:30 -05:00
Glenn Randers-Pehrson
36edbb5eee [devel] Imported from libpng-1.5.3rc01.tar 2011-06-03 07:18:14 -05:00
Glenn Randers-Pehrson
3fceee058f [devel] Fix typo in pngwutil.c comment. 2011-05-23 06:31:33 -05:00
Glenn Randers-Pehrson
0640cc3d3a [devel] Bump to version libpng-1.5.3beta11 2011-05-20 09:31:08 -05:00
Glenn Randers-Pehrson
3f68453d4a [devel] Imported from libpng-1.5.3beta10.tar 2011-05-20 09:30:08 -05:00
Glenn Randers-Pehrson
0a048923ae [devel] Update CHANGES and ANNOUNCE 2011-05-18 21:44:37 -05:00
John Bowler
5441e18988 [devel] Add tests for expand16, more fixes for palette image tests 
Changes only pngvalid and test-pngvalid-full.sh - no libpng changes -
 corrects the code for palette image tests, disables attempts to validate
 palette colors.
 2011-05-18 18:57:12 -05:00
John Bowler
db0ed3e62d [devel] png_set_background+png_expand_16 did not interwork correctly. 
This problem is present in 1.5.2; if png_set_background is called with
 need_expand false and the matching 16 bit color libpng erroneously just treats
 it as an 8-bit color because of where png_do_expand_16 is in the transform
 list.  This simple fix reduces the supplied colour to 8 bits, so it gets
 smashed, but this is better than the current behavior.
 2011-05-18 18:51:24 -05:00
Glenn Randers-Pehrson
8a7ec52c8b [devel] Consistently use "n-bit", not "n bit" in png.c 2011-05-17 07:14:30 -05:00
Glenn Randers-Pehrson
66e1b3abba [devel] Bump to version libpng-1.5.3beta10 2011-05-17 07:03:21 -05:00
Glenn Randers-Pehrson
cd116fa248 [devel] Fix spelling of "conversion" in manual. 2011-05-17 06:56:50 -05:00
Glenn Randers-Pehrson
c261077788 [devel] Consistently use "n-bit", not "n bit" in CHANGES and ANNOUNCE. 2011-05-17 06:52:54 -05:00
Glenn Randers-Pehrson
55fbff358a [devel] Consistently use "n-bit", not "n bit" in comments. 2011-05-17 06:49:32 -05:00
John Bowler
1921e6db90 [devel] Reversed earlier change of transformation order; move 
png_expand_16 back where it was before libpng-1.5.3beta07.
The change doesn't work because it requires 16 bit gamma tables when the code
only generates 8 bit ones.  This fails silently; the libpng code just doesn't
do any gamma correction.  Moving the tests back leaves the old, inaccurate, 8
bit gamma calculations, but these are clearly better than none!
 2011-05-16 20:57:54 -05:00
Glenn Randers-Pehrson
bb4f77cd95 [devel] Bump to version libpng-1.5.3beta09 2011-05-16 20:42:11 -05:00
Glenn Randers-Pehrson
5ca62c9f35 [devel] Bump to version libpng-1.5.3rc01 2011-05-16 09:14:42 -05:00
Glenn Randers-Pehrson
1591a4c9dc [devel] Imported from libpng-1.5.3beta08.tar 2011-05-16 09:10:37 -05:00
Glenn Randers-Pehrson
c36074e85a [devel] Removed reference to non-existent png_set_rgb_to_Y from the manual. 2011-05-16 09:08:51 -05:00
Glenn Randers-Pehrson
73904f52b4 [devel] Minor revisions to comments on pngstruct.h and pngvalid.c 2011-05-15 19:38:06 -05:00
Glenn Randers-Pehrson
0e128dfa2f [devel] Update CHANGES and ANNOUNCE; fix some new typos in comments. 2011-05-15 19:09:24 -05:00
John Bowler
9994f25733 [devel] pngvalid: add memory overwrite and palette image checks 
also minor cleanup in the libpng code itself (pngrtran.c and pngrutil.c) and some
extra checking there.
 2011-05-15 18:52:39 -05:00
Glenn Randers-Pehrson
593fc04096 [devel] Fix typos and indentation in new material in the documentation. 2011-05-12 22:18:23 -05:00
John Bowler
cb0b29631f [devel] Documented png_set_alpha_mode(), other changes in libpng.3 and 
libpng-manual.txt.
  The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
    parameters are supplied by the caller), while in the absence of cHRM
    sRGB/Rec 709 values are still used.
  The bKGD chunk no longer overwrites the background value set by
    png_set_background(), allowing the latter to be used before the file
    header is read. It never performed any useful function to override
    the default anyway.

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 2011-05-12 21:48:29 -05:00
John Bowler
ed4d32baa4 [devel] Improve "pngvalid --speed" to exclude more of pngvalid from the time. 2011-05-11 23:02:28 -05:00
Glenn Randers-Pehrson
d83530f45d [devel] Bump to version libpng-1.5.3beta08 2011-05-11 14:39:11 -05:00
Glenn Randers-Pehrson
cb3f42123f [devel] Imported from libpng-1.5.3beta07.tar 2011-05-11 14:36:14 -05:00