[cairo] Clip region problems

[Keith Packard]

On Wed, 2005-05-18 at 15:56 -0700, Bill Spitzak wrote:
> What happens if you create multiple cairo_surface_t objects for the same 
> object? Is this supposed to work? (my guess is that it works for some 
> backends, and not for others...)

It works if you pass a re-usable backend object to cairo (xlib, win32,
quartz), otherwise you're out of luck.  In particular, the PDF and image
backends have no separable object.  As such, the semantics of doing this
must be defined by the backend, so applications better not plan on
taking advantage of them in a multi-backend environment. 

As long as we carefully define the semantics within the same surface,
and make those generally useful, I think we're fine.

-keith

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