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Fix (work round) rgb-to-gray issues in libpng 1.6

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The previous attempts to ignore the errors in the code aren't quite enough to
deal with the 'channel selection' encoding added to libpng 1.7; abort.
pngvalid.c is changed to drop this encoding in prior versions.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler 2015-09-26 17:41:02 -07:00
parent 068cb3a64c
commit 04402a9126
1 changed files with 2 additions and 0 deletions
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contrib/libtests/pngvalid.c
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@ -10960,11 +10960,13 @@ static const color_encoding test_encodings[] =
/*red: */ { 0.716500716779386, 0.258728243040113, 0.000000000000000 },
/*green:*/ { 0.101020574397477, 0.724682314948566, 0.051211818965388 },
/*blue: */ { 0.146774385252705, 0.016589442011321, 0.773892783545073} },
#if PNG_LIBPNG_VER >= 10700
/* Fake encoding which selects just the green channel */
/*gamma:*/ { 1.45/2.2, /* the 'Mac' gamma */
/*red: */ { 0.716500716779386, 0.000000000000000, 0.000000000000000 },
/*green:*/ { 0.101020574397477, 1.000000000000000, 0.051211818965388 },
/*blue: */ { 0.146774385252705, 0.000000000000000, 0.773892783545073} },
#endif
};
/* signal handler