This essentially combines the format conversion with a copy_rect.

It cannot be used when stretching, since stretching of 1bpp is
slightly special.  Similarly, it cannot be used if the dst is also
1bpp (hence there is no mask_rect_1) or if the rop involves the brush.
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>