11 Commits

Author SHA1 Message Date
John Bowler
b0076faf1f Backward compatibility with 1.6
1.6 did not define PNG_READ_PNG_SUPPORTED, ever; it doesn't matter there.

Signed-off-by: John Bowler <jbowler@acm.org>
2015-11-23 18:14:57 -08:00
John Bowler
6803b09cb7 Fixes for !READ_INTERLACE/!READ_PNG interpendencies
The reliance of png_read_png on interlace handling and some minor issues in the
test programs where they failed to correctly check for interlace handling were
exposed by the ability to write interlaced images even if WRITE_INTERLACING is
turned off.  This is fixed here.

Signed-off-by: John Bowler <jbowler@acm.org>
2015-11-22 21:37:16 -08:00
John Bowler
c5ead5d2cd Test changes
Most of these are back-portable to earlier versions (contrib/libtests
should just work with earlier versions), however the 1.7 specific
changes in pngvalid mean that it probably won't work against 1.7 without
the commits following this one.

Signed-off-by: John Bowler <jbowler@acm.org>
2015-09-14 17:57:40 -07:00
Glenn Randers-Pehrson
a671f8baea [libpng17] Quieted Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
would only work with iTXt chunks with length 255 or less.
2015-06-03 16:21:57 -05:00
John Bowler
f87df31c8c [libpng17] Fixed GCC unsigned int->float warnings. Various versions of GCC
seem to generate warnings when an unsigned value is implicitly
    converted to double. This is probably a GCC bug but this change
    avoids the issue by explicitly converting to (int) where safe.
  Free all allocated memory in pngimage. The file buffer cache was left
    allocated at the end of the program, harmless but it causes memory
    leak reports from clang.
  Fixed array size calculations to avoid warnings. At various points
    in the code the number of elements in an array is calculated using
    sizeof.  This generates a compile time constant of type (size_t) which
    is then typically assigned to an (unsigned int) or (int). Some versions
    of GCC on 64-bit systems warn about the apparent narrowing, even though
    the same compiler does apparently generate the correct, in-range,
    numeric constant.  This adds appropriate, safe, casts to make the
    warnings go away.
2014-11-05 18:53:01 -06:00
Glenn Randers-Pehrson
b407af6503 [libpng17] Imported from libpng-1.7.0beta34.tar 2014-03-17 13:19:20 -05:00
Glenn Randers-Pehrson
f99393490d [libpng17] Imported from libpng-1.7.0beta32.tar 2014-02-26 12:54:47 -06:00
Glenn Randers-Pehrson
9a3f244085 [libpng17] Imported from libpng-1.7.0beta31.tar 2014-02-05 22:46:04 -06:00
Glenn Randers-Pehrson
98b9371115 [libpng17] Fixed some typos in commentary of pngimage.c 2014-02-05 13:21:41 -06:00
John Bowler
dc63b03da1 [libpng17] Completed full working pngimage test program and added two test
scripts.  Fixed combination of ~alpha with shift. On read invert alpha,
processing occurred after shift processing, which causes the final values to be
outside the range that should be produced by the shift. Reversing the
order on read makes the two transforms work together correctly and mirrors
the order used on write.
2014-02-05 11:39:59 -06:00
Glenn Randers-Pehrson
302c58b8cf [libpng17] Added pngimage test program for png_read_png and png_write_png.
This is a work-in-progress; no tests are run automatically at present and
the program by virtue of exhaustively testing all the transforms is
very slow.
2014-01-31 22:00:27 -06:00