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[libpng16] tests backported from libpng 1.7

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This updates libpng16 with all the test changes from libpng17,
including changes to pngvalid.c to ensure that the original,
distributed, version of contrib/visupng/cexcept.h can be used.

pngvalid contains the correction to the use of SAVE/STORE_
UNKNOWN_CHUNKS; a bug revealed by changes in libpng 1.7.  More
tests contain the --strict option to detect warnings and the
pngvalid-standard test has been corrected so that it does not
turn on progresive-read (there is a separate test which does
that.)

Some signed/unsigned fixes have been made.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2015-09-15 15:38:52 -07:00
parent 1e16e8829d
commit c3e7e7d715
19 changed files with 687 additions and 467 deletions
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2
contrib/examples/pngpixel.c
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@@ -87,7 +87,7 @@ print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row,
*/
case PNG_COLOR_TYPE_PALETTE:
{
PNG_CONST unsigned int index = component(row, x, 0, bit_depth, 1);
PNG_CONST int index = component(row, x, 0, bit_depth, 1);
png_colorp palette = NULL;
int num_palette = 0;