[cairo] Clip region problems

[Keith Packard]

On Wed, 2005-04-27 at 11:33 -0400, Owen Taylor wrote:
> >  4. Only allow a surface to be used for a single thing at a same time
> > 
> >      - two cairo_t's cannot be active for the same target surface
> >      - a surface that is the target of a cairo_t cannot be used
> >        as a source.
> > 
> >     Pro: Simple
> >     Con: Fairly big restriction

I don't mind limiting us to one cairo_t per surface, but it seems harsh
to prohibit using a surface for both dest and source at the same time.
What do we need to solve to make this possible?  Do we just need more
state in the cairo_surface_t object?

-keith

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