Re: [AD] masked_blit alpha channel problems.

["Trent Gamblin" <trent@xxxxxxxxxx>]

On Wed, January 21, 2009 12:29 pm, AJ said:
> how masked_blit is likely written...
> if ( MAGIC_PINK_32 != pixel32 )
>      draw_it()

That is indeed how it is written. It uses bitmap_mask_color, which returns 0xff00ff with this test program:

#include <allegro.h>
int main(void)
{
	allegro_init();
	set_color_depth(32);
	set_gfx_mode(GFX_AUTODETECT_WINDOWED, 320, 240, 0, 0);
	printf("%x\n", bitmap_mask_color(screen));
	return 0;
}


So the question is, should the alpha bits be set in the mask color returned by bitmap_mask_color, or should they be
ignored in the comparison. I think both.

Trent :{)>