Question on gdk-pixbuf

[Loban Rahman <loban enigma caltech edu>]

I've got a quick question. What's a good way of compositing a pixbuf A
onto a pixbuf B using pixbuf C as an alpha mask, resulting with a pixbuf
D? A and C are color pixbuf's with alpha channels. C is a greyscale pixbuf.

I've been reading the gdk_pixbuf documentation, but I'm a bit muddled.

	= L

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