[cairo] Pixman - refactoring of fbFetchTransformed - performance issue

[Antoine Azar]

>What processor and which compiler (and options) are you using?

I'm using Visual C++ on WinXP, compiling with -O2.

>As an aside, it's odd that the difference between *_source and *_over
>is so large in your tests, and that *_source turns out to be slower.
>I wonder why.

That's a good point. It might be due to the work I'm doing presently 
to optimize over, but over shouldn't get faster than source. I'll 
re-run the tests with the repository version of Cairo.

Antoine