How to detect backbuffer data changed?

Hi All,
How can I detect that the contents of the backbuffer has changed?

What I am doing is reading the backbuffer during a drawFrame the contents changing them (running a filter against the contents) then writing back to it. But I do not want to do this repeatedly on the contents I have already changed. So I am looking for a way to only read when the contents have changed.

So is there a way to do that?


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