get_update_area
Description:
Transfers ownership of the update area from this to the caller of the function.
That is, after calling this function, this will no longer have an invalid/dirty region; the update area is
removed from this and handed to you. If a window has no update area, get_update_area
returns null. You are responsible for calling cairo_region_destroy on the returned region
if it’s non-null.
Parameters:
| this |
a Window |
Returns:
|
the update area for this |