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sw_engine rle: ++ precise alpha in anti-aliasing

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could loss 1 pixel since it divides 255 values by 256.
This commit is contained in:
Hermet Park 2021-05-21 19:56:39 +09:00
parent edaafd99b3
commit d49e91f683
1 changed files with 1 additions and 1 deletions
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2
src/lib/sw_engine/tvgSwRle.cpp
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@ -649,7 +649,7 @@ SwSpan* _intersectSpansRegion(const SwRleData *clip, const SwRleData *targetRle,
out->x = sx1 > cx1 ? sx1 : cx1; out->x = sx1 > cx1 ? sx1 : cx1;
out->len = (sx2 < cx2 ? sx2 : cx2) - out->x; out->len = (sx2 < cx2 ? sx2 : cx2) - out->x;
out->y = spans->y; out->y = spans->y;
out->coverage = (uint8_t)((spansCorverage * clipSpansCoverage) >> 8); out->coverage = (uint8_t)(((spansCorverage * clipSpansCoverage) + 0xff) >> 8);
++out; ++out;
--spanCnt; --spanCnt;
} }