I found Cairo rather slow, even on the fastest hardware.
Maybe OpenVG will take off one day:
http://www.khronos.org/openvg
2009/1/30 Bryan O'Sullivan
Hi, Antony -
It's good to see you active on here.
It's not clear to me if the Cairo API in its current form supports vector-level clipping or constructive area geometry, [...]
The Cairo clipping API is very PostScripty; you set up a path and then turn it into a clip region instead of filling it. You don't end up with a first-class value, but a manipulation of the implicit global rendering state. For CAG-style operations, http://lib2geom.sourceforge.net/ would be a better bet, but FFIing to a library written in C wouldn't necessarily be a real improvement over just writing a CAG library natively. I think it would be true to say that you can't quite get everything you would want in one easy-to-use place, then.
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