Antialias edges?

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Grey Alien

Anyone got any cool code that allows you to do a draw image but where the background of the image is transparent (ordinary mask) and the edges of the image (say it's a text logo) are antialiased onto whatever you are drawing. This would be the equivalent of "feathering" in paint programs.

I have found some anti-alias code but nothing to do edge detection, guess I could write one but thought I'd ask first.

Thanks for any help!