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PixelArray data is non-premultiplied

v1.x
Tj Holowaychuk 14 years ago
parent
commit
4d57a9c201
  1. 13
      src/PixelArray.cc

13
src/PixelArray.cc

@ -103,10 +103,15 @@ PixelArray::PixelArray(Canvas *canvas, int sx, int sy, int width, int height):
for (int x = 0; x < width; ++x) {
int bx = x * 4;
uint32_t *pixel = row + x + sx;
dst[bx + 3] = (*pixel & 0xff000000) >> 24;
dst[bx + 0] = (*pixel & 0x00ff0000) >> 16;
dst[bx + 1] = (*pixel & 0x0000ff00) >> 8;
dst[bx + 2] = *pixel & 0xff;
uint8_t a = *pixel >> 24;
uint8_t r = *pixel >> 16;
uint8_t g = *pixel >> 8;
uint8_t b = *pixel;
dst[bx + 3] = a;
float alpha = (float) a / 255;
dst[bx + 0] = (int)((float) r / alpha);
dst[bx + 1] = (int)((float) g / alpha);
dst[bx + 2] = (int)((float) b / alpha);
}
dst += dstStride;
}

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