How to get an image of painted UI?

[BctfN0HUK7Yg]

Is it possible and how to?
I have several tabs with generated Ui and want to use a preview image of them but without new computation. I want to paint ui once and get the image form output

[emilk]

Getting an image for it is outside the scope of egui, but maybe with some work one could make egui spit out the Shape:s that a panel, window etc generates. Check out GraphicLayers if you are interested in working on this!