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  2. Commit 7c5ce99bd92fb480b7235cbc9a005f7e6d31f1d7
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swscale: fix signed overflow in yuv2mono_X_c_template

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>

Mans Rullgard authored on 2011/11/27 06:53:00
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libswscale/swscale.c
History View file @ 7c5ce99
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@@ -510,7 +510,7 @@ yuv2mono_X_c_template(SwsContext *c, const int16_t *lumFilter,
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     const uint8_t * const d128=dither_8x8_220[y&7];
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     uint8_t *g = c->table_gU[128] + c->table_gV[128];
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     int i;
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-    int acc = 0;
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+    unsigned acc = 0;
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     for (i = 0; i < dstW - 1; i += 2) {
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         int j;