[cairo] EXTEND_PAD Support

[Jeff Muizelaar]

On Sun, Dec 30, 2007 at 07:43:41PM -0500, Antoine Azar wrote:
> Hi Jeff,
> 
> that's very similar to what I did and I got the extend_pad unit test 
> working. I was thinking of cleaning up that section of the code, 
> because the duplication is indeed pretty bad. I'm new to cairo's code 
> though so I'm not sure yet if there are other places that need 
> modifications to fully support extend_pad. I'll look further into it.

The part that makes cleaning up the duplication hard is that all of this
code is rather performance sensitive. It will be difficult to eliminate
the duplicate code without introducing performance regressions.

-Jeff