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Bug 1132081 - Speed up ConvertHostARGBRow() in the PNG encoder. r=jmuizelaar

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This commit is contained in:
Glenn Randers-Pehrson 2015-02-21 05:54:00 +01:00
parent f461f1f825
commit dfcfb7d851
1 changed files with 8 additions and 5 deletions
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13
image/encoders/png/nsPNGEncoder.cpp
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@ -660,14 +660,17 @@ nsPNGEncoder::ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
uint8_t* pixelOut = &aDest[x * pixelStride];
uint8_t alpha = (pixelIn & 0xff000000) >> 24;
if (alpha == 0) {
pixelOut[0] = pixelOut[1] = pixelOut[2] = pixelOut[3] = 0;
pixelOut[pixelStride - 1] = alpha; // overwritten below if pixelStride == 3
if (alpha == 255) {
pixelOut[0] = (pixelIn & 0xff0000) >> 16;
pixelOut[1] = (pixelIn & 0x00ff00) >> 8;
pixelOut[2] = (pixelIn & 0x0000ff) ;
} else if (alpha == 0) {
pixelOut[0] = pixelOut[1] = pixelOut[2] = 0;
} else {
pixelOut[0] = (((pixelIn & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
pixelOut[1] = (((pixelIn & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
pixelOut[2] = (((pixelIn & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
if (aUseTransparency)
pixelOut[3] = alpha;
pixelOut[2] = (((pixelIn & 0x0000ff) ) * 255 + alpha / 2) / alpha;
}
}
}