[cairo] set a reverse clip

[zaheer ahmad]

hi,
i have two rectangles A and B that may or may not intersect. If they do
intersect (lets say C), i would like a cairo clip on A such that only C is
masked out from the drawing and the rest of A gets drawn. how can i do that.
i dont seem to find a reverse of cairo_clip, something like
cairo_set_source_surface(A), cairo_rev_clip(B). Appreciate any pointers.

thanks,
Zaheer
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