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Make gif transparent color to be transparent black

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Change it from transparent white to transparent black, which matches
the transparent color assumed in Webp dispose-to-background method.

Also pre-multiply background colors before comparison in anim_diff,
just as what is done with regular pixel values.

Change-Id: I5a790522df21619c666ce499f73e42294ed276f2
This commit is contained in:
hui su
2016-09-01 15:11:44 -07:00
parent 0887fc2d85
commit 43bd895879
3 changed files with 18 additions and 4 deletions
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2
examples/gifdec.c
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@ -21,7 +21,7 @@
#include "webp/encode.h"
#include "webp/mux_types.h"
#define GIF_TRANSPARENT_COLOR 0x00ffffff
#define GIF_TRANSPARENT_COLOR 0x00000000
#define GIF_WHITE_COLOR 0xffffffff
#define GIF_TRANSPARENT_MASK 0x01
#define GIF_DISPOSE_MASK 0x07