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avfilter/vf_blend: fix macro ()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-06-22 20:49:00 +02:00
parent 31f77b46b2
commit 9b33cdcab2
1 changed files with 4 additions and 4 deletions
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8
libavfilter/vf_blend.c
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@ -179,10 +179,10 @@ static void blend_## name(const uint8_t *top, int top_linesize, \
#define A top[j]
#define B bottom[j]
#define MULTIPLY(x, a, b) (x * ((a * b) / 255))
#define SCREEN(x, a, b) (255 - x * ((255 - a) * (255 - b) / 255))
#define BURN(a, b) ((a == 0) ? a : FFMAX(0, 255 - ((255 - b) << 8) / a))
#define DODGE(a, b) ((a == 255) ? a : FFMIN(255, ((b << 8) / (255 - a))))
#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))
#define SCREEN(x, a, b) (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))
#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))
#define DODGE(a, b) (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))
DEFINE_BLEND(addition, FFMIN(255, A + B))
DEFINE_BLEND(average, (A + B) / 2)