[cairo] draw lines on only one channel
tzhuan at gmail.com
Wed Mar 3 00:50:22 PST 2010
I want to draw lines on only one channel (e.g. red channel),
and I don't want to change the contents on other channels.
For example, when I draw a line on red channel (suppose
the color is (1.0, 0.0, 0.0)), then draw a line on blue channel
(suppose the color is (0.0, 0.0, 1.0)), I hope the intersect is
purple (1.0, 0.0, 1.0) not blue.
Is there any way to do this using cairo efficiently?
Thanks a lot.
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