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Fixed PixelArray constructor

v1.x
Tj Holowaychuk 14 years ago
parent
commit
9c0e79fef3
  1. 13
      src/PixelArray.cc

13
src/PixelArray.cc

@ -90,19 +90,18 @@ PixelArray::PixelArray(Canvas *canvas, int sx, int sy, int width, int height):
// Normalize data (argb -> rgba)
for (int y = 0; y < height; ++y) {
uint32_t *srcRow = (uint32_t *)(src + _stride * y);
uint32_t *dstRow = (uint32_t *)(dst + _stride * y);
for (int x = 0; x < width; ++x) {
int bx = x * 4;
uint32_t *pixel = srcRow + x;
uint32_t *dstPixel = dstRow + x;
// premultiplied
uint8_t a = *pixel >> 24;
uint8_t r = (*pixel >> 16) * 255 / a;
uint8_t g = (*pixel >> 8) * 255 / a;
uint8_t b = *pixel * 255 / a;
printf("rgba(%d,%d,%d,%d)\n", r,g,b,a);
dst[bx + 3] = a;
dst[bx + 0] = (*pixel >> 16) * 255 / a;
dst[bx + 1] = (*pixel >> 8) * 255 / a;
dst[bx + 2] = *pixel * 255 / a;
}
dst += _stride;
}
}

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