When a viewport is set, damage will only work properly when using
wl_surface_damage_buffer instead of wl_surface_damage.
When no viewport is set, there should be no difference between
surface and buffer damage.
This is a preparation patch for using viewport to add support for fake
mode-changes through xrandr for apps which want to change the resolution
when going fullscreen.
Changes by Hans de Goede <hdegoede@redhat.com>:
-Split the damage changes out into their own patch
-Add xwl_surface_damage helper
-Also use buffer_damage / the new helper for the present and cursor code
Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
7c6f17790d