[cairo] Help: Question on Cairo::OPERATOR_XOR of set_operator?
lisb at cs.man.ac.uk
Wed Oct 8 06:06:39 PDT 2008
I am a new user of cairo and I am wondering how to use the XOR
In computer graphics, the screen can restore original color if
the same operation 2 times in XOR mode. I understand that cairo
the function. Intuitively, I wrote the following codes for
cr->set_source_rgb(0.0, 0.8, 0.0);
However, the original color is not restored. I tried several
but there is no way out.
Can any one give me some hints?
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