kiss-lang/lime
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Implemented the cpp part

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MrCdK
2015-04-28 01:34:25 +02:00
parent 538371c7c6
commit a7bfb9936b
2 changed files with 11 additions and 7 deletions
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12
project/src/graphics/utils/ImageDataUtil.cpp
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@@ -162,6 +162,8 @@ namespace lime {
} else {
float sourceAlpha;
float destAlpha;
float outA;
float oneMinusSourceAlpha;
for (int row = sourceRect->y + sourceImage->offsetY; row < rows; row++) {
@@ -172,12 +174,14 @@ namespace lime {
offset = ((row + rowOffset) * stride) + ((column + columnOffset) * 4);
sourceAlpha = sourceData[sourceOffset + 3] / 255.0;
destAlpha = data[offset + 3] / 255.0;
oneMinusSourceAlpha = (1 - sourceAlpha);
data[offset] = __clamp[int (sourceData[sourceOffset] * sourceAlpha)] + __clamp[int(data[offset] * oneMinusSourceAlpha)];
data[offset + 1] = __clamp[int (sourceData[sourceOffset + 1] * sourceAlpha)] + __clamp[int(data[offset + 1] * oneMinusSourceAlpha)];
data[offset + 2] = __clamp[int (sourceData[sourceOffset + 2] * sourceAlpha)] + __clamp[int(data[offset + 2] * oneMinusSourceAlpha)];
data[offset + 3] = __clamp[int (sourceData[sourceOffset + 3] * sourceAlpha)] + __clamp[int(data[offset + 3] * oneMinusSourceAlpha)];
outA = sourceAlpha + destAlpha * oneMinusSourceAlpha;
data[offset + 0] = __clamp[(int) round ((sourceData[sourceOffset + 0] * sourceAlpha + data[offset + 0] * destAlpha * oneMinusSourceAlpha) / outA)];
data[offset + 1] = __clamp[(int) round ((sourceData[sourceOffset + 1] * sourceAlpha + data[offset + 1] * destAlpha * oneMinusSourceAlpha) / outA)];
data[offset + 2] = __clamp[(int) round ((sourceData[sourceOffset + 2] * sourceAlpha + data[offset + 2] * destAlpha * oneMinusSourceAlpha) / outA)];
data[offset + 3] = __clamp[(int) round (outA * 255.0)];
}