Returns the mask color of the specified bitmap.


Returns the mask color for the specified bitmap (the value which is skipped when drawing sprites). For 256-color bitmaps this is zero, and for truecolor bitmaps it is bright pink (maximum red and blue, zero green). A frequent use of this function is to clear a bitmap with the mask color so you can later use this bitmap with masked_blit() or draw_sprite() after drawing other stuff on it. Example:
      /* Replace mask color with another color. */
      for (y = 0; y < bmp->h; y++)
	 for (x = 0; x < bmp->w; x++)
	    if (getpixel(bmp, x, y) == bitmap_mask_color(bmp))
	       putpixel(bmp, x, y, another_color);
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