[cairo] Pixman - refactoring of fbFetchTransformed - performance issue

[Antoine Azar]

I've re-ran the perf suite (paint, paint-with-alpha and fill for 
mag/min) with the repository version of Cairo and before/after the 
pixman-compose refactoring, and reposted my results on 
www.antoineazar.com/refactor2.htm

My findings:
-In terms of performance difference for the refactoring, same thing. 
I get 1-2% variations, either faster or slower.
-As for the over/source differences I observed earlier, they were due 
to my work in progress regarding the optimization. Over was 3x faster 
than it is in the repository. Weird though source wasn't as fast, 
I'll check if I'm optimizing it with the fill operator too or if I'm 
missing that.

If anyone else could run the perf suite, it would help.
Thanks,
Antoine