Unmaps the image surface as returned from cairo_surface_map_to_image|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 Surface.mapToImage
results in undefined behavior.
Since 1.12
Unmaps the image surface as returned from cairo_surface_map_to_image|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 Surface.mapToImage results in undefined behavior. Since 1.12