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Grabbing what's behind a window

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Grabbing what's behind a window

Subject: Grabbing what's behind a window
From: Kenny Leung <email@hidden>
Date: Mon, 29 Oct 2007 15:49:02 -0700

Dear Graphics Gurus:

I'm trying to make a transparent "lens" effect on the screen using a core-image filter. When it's time to update, I orderOut the window I'm drawing in, grab the background, and then orderFront the window with the transformed contents. Unfortunately, this does not work - I keep grabbing the contents of my own window. I have tried the orderOut, then doing the grab in a performSelector:afterDelay, but this generates an annoying flicker.

I'm wondering if what I'm trying to do is an impossibility - or is there some trick by which it can be done?

Thanks!

-Kenny

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