[cairo] Patch for extend-pad support on untransformed sources

[Antoine Azar]

Hey all,

thanks to Vladimir for spotting a bug on extend-pad for untransformed 
sources. We were reading bogus memory in pixman instead of padding 
correctly with bordel pixels. You can see this by painting a small 
surface onto a large destination with no transform, and extend_pad enabled.

I'm attaching a patch to fix this. It's probably far from optimal 
speed-wise, but it's consistent with what we do for extend_repeat.
Best,
Antoine
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