Function ComputeTransparency

src/Bitmap.c:345–356

Sets alpha to 0 for any pixels in the bitmap whose RGB is same as colorspace */

/* Sets alpha to 0 for any pixels in the bitmap whose RGB is same as colorspace */
static void ComputeTransparency(struct Bitmap* bmp, BitmapCol col) {
	BitmapCol trnsRGB = col & BITMAPCOLOR_RGB_MASK;
	int x, y, width = bmp->width, height = bmp->height;

	for (y = 0; y < height; y++) {
		BitmapCol* row = Bitmap_GetRow(bmp, y);
		for (x = 0; x < width; x++) {
			BitmapCol rgb = row[x] & BITMAPCOLOR_RGB_MASK;
			row[x] = (rgb == trnsRGB) ? trnsRGB : row[x];
		}
	}
}

static BitmapCol ExpandRGB(cc_uint8 bitsPerSample, int r, int g, int b) {
	switch (bitsPerSample) {