Make it possible to define a destination colour palette when
using convert_pixels(), so converting a bitmap from a non
indexed format to an indexed format does not produce an empty image.
Signed-off-by: Bernhard Kölbl <besentv@gmail.com>
Signed-off-by: Esme Povirk <esme@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>