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avfilter/vf_boxblur: avoid one addition per line

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-21 00:59:23 +01:00
parent 7cdce8cb55
commit f622ff16cd
1 changed files with 1 additions and 2 deletions
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3
libavfilter/vf_boxblur.c
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@ -221,11 +221,10 @@ static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_
*/
const int length = radius*2 + 1;
const int inv = ((1<<16) + length/2)/length;
int x, sum = 0;
int x, sum = src[radius*src_step];
for (x = 0; x < radius; x++)
sum += src[x*src_step]<<1;
sum += src[radius*src_step];
sum = sum*inv + (1<<15);