[cairo] Optimization and bug-fixes for unbounded operators

[Carl Worth]

On Tue, 16 Aug 2005 17:43:57 -0400, Owen Taylor wrote:
> This patch does two things:
> 
>  - It optimizes the case where an unbounded operator can be
>    divided into:
...
>  - It fixes a bug where when we are compositing with 
> 
>     a) an unbounded operator
>     b) a *bounded* source
>     c) a mask as big as the destination region

This looks reasonable to me. I haven't verified all the logic here,
but I hope the test suite should cover most of what I haven't.

-Carl
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