The motivation under this is not just supporting conversion between
compressed formats. Currently fallback CPU blitter cannot convert
from DXTn formats at all, this patch allows for that if software
decompression function is available.
Signed-off-by: Paul Gofman <gofmanp@gmail.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>