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Re: Grabbing what's behind a window

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Re: Grabbing what's behind a window

Subject: Re: Grabbing what's behind a window
From: Eric Schlegel <email@hidden>
Date: Mon, 29 Oct 2007 16:05:23 -0700


On Oct 29, 2007, at 3:49 PM, Kenny Leung wrote:

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?

In Leopard, perhaps you could use CGWindowListCreateImage (CoreGraphics/CGWindow.h).

-eric

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  >Grabbing what's behind a window (From: Kenny Leung <email@hidden>)




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