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swscale: fix signed overflow in yuv2mono_X_c_template

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As old bits are shifted out of the accumulator, they cause signed
overflows when they reach the end.  Making the variable unsigned fixes
this.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-11-26 21:53:00 +00:00
parent 8540dcfd7a
commit 7c5ce99bd9
1 changed files with 1 additions and 1 deletions
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2
libswscale/swscale.c
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@ -510,7 +510,7 @@ yuv2mono_X_c_template(SwsContext *c, const int16_t *lumFilter,
const uint8_t * const d128=dither_8x8_220[y&7];
uint8_t *g = c->table_gU[128] + c->table_gV[128];
int i;
int acc = 0;
unsigned acc = 0;
for (i = 0; i < dstW - 1; i += 2) {
int j;