Computes the region of the window that is potentially visible. This does not necessarily take into account if the window is obscured by other windows, but no area outside of this region is visible.
a #cairo_region_t. This must be freed with cairo.region.Region.destroy when you are done.
Computes the region of the window that is potentially visible. This does not necessarily take into account if the window is obscured by other windows, but no area outside of this region is visible.