A formula that captures /cuts, as a bitmap, the wallpaper image that's behind a shape.
It would be helpful for applying dinamic image manipulation effects to the widget's background shape.
For exemple blurring it would give you a frosted glass effect in kwgt.
This way you don't need to do any manipulations to the actual wallpaper but you still get the effect applied regardless of the wallpaper used..
It could be implemented as an option alongside the choose image menu when selecting a bitmap value.