I'm making a window which captures a screen image then applies a filter to it 
for drawing effects (like the menus in the Dock). The problem I'm having is I 
can't be sure when anything in the screen changes underneath it changes so I 
don't know when to update the screen image.

Are there any notifications I could get that would tell me if screen pixels 
changed that were within a certain rect on screen? Thanks.

Regards,
        Ryan Joseph
        thealchemistguild.org

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