Not sure how you'd do this in gdk directly, but I can think of two alternatives:
a. Use Cairo (supports alpha channels, and gives you awesome-looking
antialiased triangles to boot)
b. Use gdk to render to 30 different GdkPixbufs, then composite them
together. The composite functions take an alpha p
I am revisiting a simple kaleidoscope program in which I would like to add
opacity/transparency for the colors. Can that
be done? I have rummaged around looking for info on the alpha channel, but
can't find anything that isn't stuck inside the
ColorSelection widget. That's not what I want; just the
