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find repaint areas?

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find repaint areas?

Subject: find repaint areas?
From: Denis Bohm <email@hidden>
Date: Wed, 7 May 2008 14:26:42 -0700

I am trying to create a buffered window and get notified whenever areas are repainted so that I can also send those areas over the network to a custom remote bitmap display. I don't want to copy the complete buffered image on each update as that would be much too slow.

NSView has getRectsBeingDrawn which seems close. What I really want is to hook into the code that is computing those rects. I assume this is done in NSWindow displayIfNeeded. But I don't see where the damage rects are stored.

Or maybe NSWindow flushWindowIfNeeded would work. But I don't see how to get the rects that need to be copied to the screen.

Any ideas on how this could be done?

Denis
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