Unmaps the image surface as returned from #cairo_surface_map_to_image().
The content of the image will be uploaded to the target surface.
Afterwards, the image is destroyed.
Using an image surface which wasn't returned by cairo_surface_map_to_image()
results in undefined behavior.
Since 1.12
Unmaps the image surface as returned from #cairo_surface_map_to_image(). The content of the image will be uploaded to the target surface. Afterwards, the image is destroyed. Using an image surface which wasn't returned by cairo_surface_map_to_image() results in undefined behavior. Since 1.12