Cairo's compositing operators
Normally, you will be using cairo to draw objects on top of each other. But cairo can do differently, if you need it! In fact, you can use all the Porter/Duff compositing operators. Fourteen different operators are available since cairo 1.0; more operators have been added in cairo 1.10. This page is a try to describe them. It may contain errors and is possibly incomplete. Please help to improve it
http://cairographics.org/releases/
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