My Geforce 7 sends R5G6B5 data to the R5G5B5A1 surface without any
conversion. r200 and r500 set the alpha bit on the destination. This
applies to sysmem->vidmem and vidmem->vidmem blits.
Signed-off-by: Stefan Dösinger <stefan@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>