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sBIT code coverage and fixes

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Fixes for sBIT handling in the low-bit-depth gray and pngstest cases, extends
sBIT handling to the colormap code in the simplified API which is separately
implemented in pngread.c

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2015-09-26 15:24:20 -07:00
parent 8dfa93beed
commit 23324b8559
7 changed files with 295 additions and 102 deletions
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10
contrib/libtests/pngvalid.c
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@@ -1949,7 +1949,7 @@ typedef struct png_modifier
unsigned int repeat :1; /* Repeat this transform test. */
unsigned int test_uses_encoding :1;
/* Lowest sbit to test (libpng fails for sbit < 8) */
/* Lowest sbit to test (pre-1.7 libpng fails for sbit < 8) */
png_byte sbitlow;
/* Error control - these are the limits on errors accepted by the gamma tests
@@ -2036,7 +2036,7 @@ typedef struct png_modifier
unsigned int test_gamma_expand16 :1;
unsigned int test_exhaustive :1;
/* Whether or not to run the low-bit-depth grayscale tests. This fail on
/* Whether or not to run the low-bit-depth grayscale tests. This fails on
* gamma images in some cases because of gross inaccuracies in the grayscale
* gamma handling for low bit depth.
*/
@@ -11125,7 +11125,11 @@ int main(int argc, char **argv)
pm.encodings = test_encodings;
pm.nencodings = ARRAY_SIZE(test_encodings);
pm.sbitlow = 8U; /* because libpng doesn't do sBIT below 8! */
# if PNG_LIBPNG_VER < 10700
pm.sbitlow = 8U; /* because libpng doesn't do sBIT below 8! */
# else
pm.sbitlow = 1U;
# endif
/* The following allows results to pass if they correspond to anything in the
* transformed range [input-.5,input+.5]; this is is required because of the