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Fixed alpha composition when destination alpha is transparent.
Jianyu Guan I found I make a big mistake that when dstA==0, I just simply let *dstp=*srcp and forgot to make dstRGB = srcRGB*srcA. The if consition "(*dstp & amask) == 0" in BlitRGBtoRGBPixelAlphaMMX and BlitRGBtoRGBPixelAlphaMMX3dNow should be removed.
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@ -352,7 +352,7 @@ BlitRGBtoRGBPixelAlphaMMX(SDL_BlitInfo * info)
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Uint32 alpha = *srcp & amask;
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if (alpha == 0) {
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/* do nothing */
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} else if (alpha == amask || (*dstp & amask) == 0) {
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} else if (alpha == amask) {
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*dstp = *srcp;
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} else {
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src1 = _mm_cvtsi32_si64(*srcp); /* src(ARGB) -> src1 (0000ARGB)*/
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@ -545,7 +545,7 @@ BlitRGBtoRGBPixelAlphaMMX3DNOW(SDL_BlitInfo * info)
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alpha = *srcp & amask;
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if (alpha == 0) {
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/* do nothing */
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} else if (alpha == amask || (*dstp & amask) == 0) {
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} else if (alpha == amask) {
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*dstp = *srcp;
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} else {
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src1 = _mm_cvtsi32_si64(*srcp); /* src(ARGB) -> src1 (0000ARGB)*/
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