cairo_region_t* gdk_cairo_region_create_from_surface ( cairo_surface_t* surface )
Creates region that covers the area where the given
surface is more than 50% opaque.
This function takes into account device offsets that might be
A cairo surface.
|The data is owned by the caller of the function.|
|The caller of the function takes ownership of the data, and is responsible for freeing it.|