[cairo] Can I tell if cairo_image_surface_create_with_data() was called?

[Bill Spitzak]

Is there a way to tell if a cairo_surface_t was created with 
cairo_image_surface_create_with_data() as opposed to 
cairo_image_surface_create()? Basically I want to know whether it owns 
the data.

It must know this because the destructor needs to know it so it can free 
the data.

This call would be somewhat useful and it would keep with the idea of 
being able to query all the arguments passed to constructors for all 
Cairo objects.