I asked much the same question a few days ago, the answer would appear
to be, you can't get those rects until drawRect: time. But couldn't
you send your remote update then anyway? While that would effectively
synchronise your remote screen update to the event cycle of the first
machine, I don't see why that would be a problem.
If you can work at the global screen level rather than view level,
there is also CGWaitForScreenUpdateRects and
CGWaitForScreenRefreshRects which need to be used from a secondary
thread - my guess is these exist to support remote display type
applications.
Alternatively you could override setNeedsDisplay: and
setNeedsDisplayInRect: and gather the rects yourself. You'd need to
handle all your own coalescing and calculation of the minimum
resulting set of rects though.
G.
On 8 May 2008, at 7:26 am, Denis Bohm wrote:
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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