[cairo] How to draw a inverted area?

Magicloud Magiclouds magicloud.magiclouds at gmail.com
Mon Jun 7 00:44:10 PDT 2010

Hi, sorry the subject is not clear.
I mean that, first I draw something in the cairo context, then I draw
a circle in it, which acts like a invert mask. All colors in its area
are inverted.
I thought xor operator helped, but it did not....

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