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textoverlay: fix comparison is always false due to limited range of data type

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Perform calculation in a temp var with enough room as there's guarantee that
ret will be able to hold the result for example in _blit_AYUV.
This commit is contained in:
Josep Torra 2011-04-01 15:33:42 +02:00 committed by Sebastian Dröge
parent 35064fdc82
commit fbc60fc6f4
1 changed files with 3 additions and 2 deletions
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5
ext/pango/gsttextoverlay.c
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@ -145,8 +145,9 @@ GST_DEBUG_CATEGORY (pango_debug);
#define OVER(ret, alphaA, Ca, alphaB, Cb, alphaNew) \
{ \
ret = (Ca * alphaA + Cb * alphaB * (255 - alphaA) / 255) / alphaNew; \
ret = CLAMP (ret, 0, 255); \
gint _tmp; \
_tmp = (Ca * alphaA + Cb * alphaB * (255 - alphaA) / 255) / alphaNew; \
ret = CLAMP (_tmp, 0, 255); \
}
#if G_BYTE_ORDER == G_LITTLE_ENDIAN