This function finishes the surface and drops all references to
external resources. For example, for the Xlib backend it means
that cairo will no longer access the drawable, which can be freed.
cairoSurfaceFinish the only valid operations on a
surface are getting and setting user, referencing and
destroying, and flushing and finishing it.
Further drawing to the surface will not affect the
surface but will instead trigger a
When the last call to
cairoSurfaceDestroy decreases the
reference count to zero, cairo will call
it hasn't been called already, before freeing the resources
associated with the surface.
Derived by RGtkGen from GTK+ documentation
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