Commit Graph

100 Commits

Author SHA1 Message Date
Glenn Randers-Pehrson
9477ecdfa6 [libpng16] Updated copyright year to 2013 in newly-changed files 2013-01-01 07:45:42 -06:00
John Bowler
520803d57e [libpng16] Removed non-working ICC profile support code. There was too much
code for too little gain; implementing full ICC color correction is maybe
desireable but is left up to applications.
2012-11-01 08:12:47 -05:00
John Bowler
f8dfd123e2 [libpng16] Changed ICC profile support to allow use of an external color
management system (CMS). In practice it is not possible to obtain cHRM
information reliably using just the end-point tags because they do not exist
in the vast majority of profiles.  Instead it is necessary to run the endpoints
through the ICC colorimetric intent transform (as described in the v4
spec).  Since this is likely to be too much code inside libpng for too
little gain (it implies a fairly complete CMS implementation) the code
has been changed to allow an external CMS to be used.  This code is
temporarily disabled until a suitable set of test cases using one or more
external CMS implementations have been implemented.
2012-10-25 19:30:02 -05:00
Glenn Randers-Pehrson
933bc842ac [libpng16] Fix confusion between "adopted" and "adapted" in new comments.
Glenn thought the "adopted" were typos and changed them all to "adapted".
This reverts the spelling and adds parenthetical comments when each
word first appears in png.h.
2012-09-04 20:16:25 -05:00
Glenn Randers-Pehrson
9c06d78468 [libpng16] Imported from libpng-1.6.0beta29.tar 2012-09-04 16:59:12 -05:00
John Bowler
b98681b49a [libpng16] Improved ICC profile handling including cHRM chunk generation and
fixed Cygwin+MSVC build errors. The ICC profile handling now includes more
checking.  Several errors that caused rejection of the profile are now
handled with a warning in such a way that the invalid profiles will be
read by default in release (but not pre-RC) builds but will not be
written by default.  The easy part of handling a cHRM chunk is written,
where the ICC profile contains the required data.  The more difficult
part plus guessing a gAMA value requires code to pass selected RGB values
through the profile.
2012-09-04 16:35:20 -05:00
Glenn Randers-Pehrson
702053d110 [libpng16] Bump version to 1.6.0beta28 2012-08-17 21:54:45 -05:00
John Bowler
e9567514dd [libpng16] Unknown handling fixes and clean up. This adds more correct option
control of the unknown handling, corrects the pre-existing bug where
the per-chunk 'keep' setting is ignored and makes it possible to skip
IDAT chunks in the sequential reader (broken in earlier 1.6 versions).
There is a new test program, test-unknown.c, which is a work in progress
(not currently part of the test suite).  Comments in the header files now
explain how the unknown handling works.
2012-08-15 22:53:00 -05:00
John Bowler
dff6f4c4f0 [libpng16Cleanup of png_set_filler(). This function does very different things
on read and write.  In libpng 1.6 the two cases can be distinguished and
considerable code cleanup, and extra error checking, is possible.  This
makes calls on the write side that have no effect be ignored with a
png_app_error(), which can be disabled in the app using
png_set_benign_errors(), and removes the spurious use of usr_channels
on the read side.
2012-08-09 21:17:56 -05:00
Glenn Randers-Pehrson
0546e4e579 [libpng16] Document deprecation of png_convert_to_rfc1123() and its
replacement with png_convert_to_rfc1123_buffer().
2012-06-12 13:06:52 -05:00
John Bowler
b11b31aea2 [libpng16] Changed chunk handler warnings into benign errors, incrementally
load iCCP
2012-03-21 07:55:46 -05:00
John Bowler
b5d0051dcb [libpng16] Deflate/inflate was reworked to move common zlib calls into single
functions [rw]util.c.  A new shared keyword check routine was also added
and the 'zbuf' is no longer allocated on progressive read.  It is now
possible to call png_inflate() incrementally.
2012-03-09 09:15:18 -06:00
John Bowler
6225b0e61e [libpng16] Added code to validate the windowBits value passed to deflateInit2().
If the call to deflateInit2() is wrong a png_warning will be issued
(in fact this is harmless, but the PNG data produced may be sub-optimal).
2012-03-05 21:26:57 -06:00
John Bowler
42a2b556e9 [libpng16] Made read 'inflate' handling like write 'deflate' handling. The
read code now claims and releases png_ptr->zstream, like the write code.
The bug whereby the progressive reader failed to release the zstream
is now fixed, all initialization is delayed, and the code checks for
changed parameters on deflate rather than always calling
deflatedEnd/deflateInit.
2012-03-05 20:57:40 -06:00
Glenn Randers-Pehrson
eeb1bb678d [libng16] Added palette-index checking while writing.
Relocated palette-index checking function from pngrutil.c to pngtrans.c
2012-03-02 22:10:15 -06:00
Glenn Randers-Pehrson
363ae65e2b [libpng16] Added tests for invalid palette index while reading and writing
(work in progress, the latter isn't finished).
2012-03-01 21:39:29 -06:00
Glenn Randers-Pehrson
c737b7cf70 [libpng16] Imported from libpng-1.6.0beta11.tar 2012-02-16 20:16:09 -06:00
Glenn Randers-Pehrson
1531bd61a0 [libpng16] Updated copyright year to 2012 2012-01-01 14:45:04 -06:00
John Bowler
fcd301daed [libpng16] Changed png_memcpy to C assignment where appropriate. Changed all
those uses of png_memcpy that were doing a simple assignment to assignments
(all those cases where the thing being copied is a non-array C L-value.)
Added some error checking to png_set_*() routines and removed the
reference to the non-exported function png_memcpy() from example.c. Fixed
the Visual C 64-bit build - it requires jmp_buf to be aligned, but it had
become misaligned.
2011-12-28 21:34:27 -06:00
John Bowler
4f67e40898 [libpng16] Add 'const' to png_structrp arguments of png_set_*() APIs.
Because these APIs store to the png_info they can take a
 png_const_structrp now that the error routines also accept
 one of these.
2011-12-28 08:43:37 -06:00
Glenn Randers-Pehrson
67ee8cee39 [libpng16] bump version to 1.6.0beta04 2011-12-22 08:34:26 -06:00
John Bowler
40b2603687 [libpng16] Start-up code size improvements, error handler flexibility. These
changes alter how the tricky allocation of the initial png_struct and png_info
structures are handled. png_info is now handled in pretty much the same
way as everything else, except that the allocations handle NULL return
silently.  png_struct is changed in a similar way on allocation and on
deallocation a 'safety' error handler is put in place (which should never
be required).  The error handler itself is changed to permit mismatches
in the application and libpng error buffer size; however, this means a
silent change to the API to return the jmp_buf if the size doesn't match
the size from the libpng compilation; libpng now allocates the memory and
this may fail.  Overall these changes result in slight code size
reductions; however, this is a reduction in code that is always executed
so is particularly valuable.  Overall on a 64-bit system the libpng DLL
decreases in code size by 1733 bytes.  pngerror.o increases in size by
about 465 bytes because of the new functionality.
2011-12-22 08:09:15 -06:00
John Bowler
d332c67da7 [libpng16] Start-up code size improvements, error handler flexibility.
These changes alter how the tricky allocation of the initial png_struct and
png_info structures are handled. png_info is now handled in pretty much the
same way as everything else, except that the allocations handle NULL return
silently.  png_struct is changed in a similar way on allocation and on
deallocation a 'safety' error handler is put in place (which should never
be required).  The error handler itself is changed to permit mismatches
in the application and libpng error buffer size; however, this means a
silent change to the API to return the jmp_buf if the size doesn't match
the size from the libpng compilation; libpng now allocates the memory and
this may fail.  Overall these changes result in slight code size
reductions; however, this is a reduction in code that is always executed
so is particularly valuable.  Overall on a 64-bit system the libpng DLL
decreases in code size by 1733 bytes.  pngerror.o increases in size by
about 465 bytes because of the new functionality.
2011-12-21 17:36:12 -06:00
Mans Rullgard
d3a94802d8 [libpng15] Added support for ARM processor (Mans Rullgard) 2011-11-03 00:47:55 -05:00
Mans Rullgard
1c42276a39 [libpng15] New png_struct member png_ptr->old_prev_row 2011-10-17 16:52:19 -05:00
John Bowler
07772cba07 [libpng15] Fixes for multiple calls to png_read_update_info.
These fixes attend to most of the errors revealed in pngvalid, however doing
the gamma work twice results in inaccuracies that can't be easily fixed.
There is now a warning in the code if this is going to happen.
2011-10-14 18:19:47 -05:00
Glenn Randers-Pehrson
997b193f63 [libpng15] Imported from libpng-1.5.6beta03.tar 2011-09-28 07:24:28 -05:00
Glenn Randers-Pehrson
bb5cb1476b [libpng15] Bump version to libpng-1.5.6beta02 2011-09-22 12:48:19 -05:00
Glenn Randers-Pehrson
115020d985 [libpng15] Imported from libpng-1.5.6beta01.tar 2011-09-22 09:51:23 -05:00
Glenn Randers-Pehrson
3e2263abf2 [libpng15] Imported from libpng-1.5.5.tar 2011-09-22 08:45:04 -05:00
Glenn Randers-Pehrson
4ae297867d [devel] Bump version to libpng-1.5.5beta07 2011-08-26 06:07:33 -05:00
John Bowler
736f40f459 [devel] Fixes to rgb_to_gray and cHRM XYZ APIs 2011-08-25 16:19:44 -05:00
Glenn Randers-Pehrson
d404b6d488 [devel] Imported from libpng-1.5.4.tar 2011-07-07 06:26:30 -05:00
Glenn Randers-Pehrson
ef217b76a3 [devel] Updated comments that mention 1.5.3; changed them to 1.5.4. 2011-06-15 12:58:27 -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
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
73904f52b4 [devel] Minor revisions to comments on pngstruct.h and pngvalid.c 2011-05-15 19:38:06 -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
John Bowler
d273ad2d0f [devel] Implementation of premultiplied alpha support: png_set_alpha_mode
(libpng-manual.txt still to be updated, see png.h for documentation.)
2011-05-07 21:00:28 -05:00
John Bowler
c5bef946b1 [devel] IDAT compression failed if preceded by a compressed text chunk
This was because the attempt to reset the zlib stream in png_write_IDAT
happened after the first IDAT chunk had been deflated - much too late.
In this change internal functions are added to claim/release the z_stream
and, hopefully, make the code more robust.  Also deflateEnd checking is
added - previously libpng would ignore an error at the end of the stream.
2011-05-05 17:35:39 -05:00
Glenn Randers-Pehrson
4753906826 [devel] Update "last changed" dates and added CHANGES entry. 2011-05-05 07:32:30 -05:00
John Bowler
88b77cc6f3 [devel] Remove png_snprintf, add formatted warning messages.
This change adds internal APIs to allow png_warning messages to have parameters
 without requiring the host OS to implelment snprintf.  As a side effect the
 dependency of the RFC1132 code on stdio is removed and PNG_NO_WARNINGS does
 actually work now.
2011-05-05 06:49:55 -05:00
John Bowler
e6dc85bb0b [devel] Changed png_struct jmp_buf member name to avoid clash with macro 2011-04-27 14:47:15 -05:00
Glenn Randers-Pehrson
205483d592 [devel] Added PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro. 2011-04-01 12:33:42 -05:00
Glenn Randers-Pehrson
3bb8683a79 [devel] Only compile the new zlib re-initializing code when text or iCCP
is supported.
2011-04-01 08:12:24 -05:00
Glenn Randers-Pehrson
1345cbeea8 [devel] Update change comments (1.5.2 -> 1.5.3) 2011-03-31 20:33:04 -05:00
Glenn Randers-Pehrson
6b3d50b2cd [devel] Re-initialize the zlib compressor before compressing non-IDAT chunks. 2011-03-31 20:14:29 -05:00
Glenn Randers-Pehrson
f5ea1b7095 [devel] Imported from libpng-1.5.0.tar 2011-01-06 06:45:07 -06:00
Glenn Randers-Pehrson
64b863cd2a [devel] Update copyright year and bump to version libpng-1.5.0rc07 2011-01-04 09:58:33 -06:00
Glenn Randers-Pehrson
f0eda4e8d7 [devel] Imported from libpng-1.5.0beta51.tar 2010-10-15 15:08:42 -05:00