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Correct bug related to signedness (M-HT).

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4198
This commit is contained in:
Peter Veenstra 2019-03-31 18:06:27 +00:00
parent 94113a7362
commit c9c97f13af
1 changed files with 3 additions and 3 deletions
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6
src/gui/render_templates_hq.h
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@ -41,17 +41,17 @@ static inline bool diffYUV(Bit32u yuv1, Bit32u yuv2)
Bit32u mask;
diff = ((yuv1 & Ymask) - (yuv2 & Ymask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
mask = ((Bit32s)diff) >> 31; // ~1/-1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trY) return true;
diff = ((yuv1 & Umask) - (yuv2 & Umask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
mask = ((Bit32s)diff)>> 31; // ~1/-1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trU) return true;
diff = ((yuv1 & Vmask) - (yuv2 & Vmask));
mask = diff >> 31; // -1 if value < 0, 0 otherwise
mask = ((Bit32s)diff) >> 31; // ~1/-1 if value < 0, 0 otherwise
diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
if (diff > trV) return true;