Retrieves a snapshot of the contained widget in the form of a #cairo_surface_t. If you need to keep this around over window resizes then you should add a reference to it.
A #cairo_surface_t pointer to the offscreen surface, or null.
Retrieves a snapshot of the contained widget in the form of a #cairo_surface_t. If you need to keep this around over window resizes then you should add a reference to it.