hw/display/sm501: Add fallbacks to pixman routines

Pixman may return false if it does not have a suitable implementation.
Add fallbacks to handle such cases.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reported-by: Rene Engel <ReneEngel80@emailn.de>
Tested-by: Rene Engel <ReneEngel80@emailn.de>
Message-Id: <20ed9442a0146238254ccc340c0d1efa226c6356.1677445307.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
1 file changed