[android-developers] ImageButton with rounded corners and no padding

A normal ImageButton with default padding embeds a rectangular image
into a frame with rounded corners. What I would like to do is
eliminate that padded frame and still have transparent rounded
corners. If I set:

android:padding="0px"

in the XML for the ImageButton, then the frame around the button
disappears, but the button has sharp corners - not rounded. I suppose
I could edit my images to make transparent rounded corners, but isn't
there a more straightforward way to do it? I'm looking for something
that will automatically erase (make transparent) the corners of my
image when padding = 0.

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