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Quartz from a thread

I've got a threaded Carbon game which does all its drawing offscreen, then does a final CopyBits.

It would be far more convenient if the drawing could be in a thread, so I'm trying to move to Quartz. Instead of a GWorld, I make a CGImage. Drawing goes (via CGBitmapContextCreate) to this, and I eventually copy it to the window with CGContextDrawImage.

But nothing was really drawing, so I'm playing around with CGContextSynchronize or QDFlushPortBuffer. My window is now (usually) redrawn, but when I turn on Quartz Debug, it appears that any change now dirties the entire window. I've tried QDSetDirtyRegion -- I get my region flashed AND the entire window.

So I'm probably missing some trick relating to drawing from a thread, though possibly it's something related to Quartz coordinates or flushing in general.

I didn't see anything relevant in the "Transitioning to Quartz 2D" document, or the list archives. Does anyone have general tips?
--

David Dunham     A Sharp, LLC
Voice/Fax: 206 783 7404     http://a-sharp.com
Efficiency is intelligent laziness.
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