Thanks for the CGWaitForScreen tip. I hadn't seen those and will take
a look.
Overriding drawRect on a top level view sounds promising also.
I had thought about overriding setNeedsDisplay on a top level view in
the window, but it wasn't clear that would catch calls to child views.
On May 7, 2008, at 6:18 PM, Graham Cox wrote:
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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