[cairo] Clip region problems

[Carl Worth]

On Wed, 27 Apr 2005 08:59:10 -0700, Keith Packard wrote:
> 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?

Since clips are per-Picture and per-pixman_image_t, it seems it should
be a fairly simple matter to simply clone the Picture or
pixman_image_t each time the surface is reused, right?

And if Owen adds the restrictions he plans, then we'll already have
code in place for detecting when the cloning is needed.

I don't know how this approach would impact other backends besides
Render and pixman.

-Carl
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