You may have a look at the JXLayer project. It offers a AbstractBufferedLayerUI 
(which isn't abstract at all) that maintains a BufferedImage of the complete 
child hierarchy of a JXLayer instance.

Via the (protected, so you have to subclass) method getBuffer(), you get that 
BufferedImage. As long as you don't resize the JXLayer, that image remains the 
same instance.

So, the complete snapshot should always be available.

The link: https://jxlayer.dev.java.net/

Piet
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