Is there any X operation (maybe through X Render) for color key overlays? I want to overlay a pixmap onto another using a color of the overlay (say RGB=0) to indicate transparency to the second pixmap. I have been able to use the alpha channel of the overlay to achieve this, where the overlay is a 32 bit pixmap, but I'm constrained in one situation to use a 24 bit pixmap with no alpha information. (I guess a related question is whether there is an efficient way to generate a 32 bit pixmap from a 24 bit pixmap where alpha is created from the contents of the 24 bit).
D
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