[cairo] implement clone_similar fallback

[Carl Worth]

On Mon, 27 Aug 2007 15:44:57 -0700, Vladimir Vukicevic wrote:
> similar_scratch, but composite() failed for whatever reason -- I don't
> want to return a surface in clone_out *and* return an error (from
> composite), because then the caller would have to know to call
> surface_destroy() on clone_out even if the fallback method returns an
> error.  That seems wrong to me;

Yes, I agree. I missed that case when I suggested code without the
cairo_surface_destroy.

> But, the null-check can definitely go

OK, that's all I was really intending to comment on. The further
(incorrect) simplification I gave was just an afterthought.

> Yep; I've changed some other stuff in cairo_surface_clone_similar as
> well, I'll post a new patch when we get the above issue resolved.

Sounds good. Keep up the great work!

-Carl
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