Re: Drawing noise in Cocoa (preferably fast)
Re: Drawing noise in Cocoa (preferably fast)
- Subject: Re: Drawing noise in Cocoa (preferably fast)
- From: Stephen Blinkhorn <email@hidden>
- Date: Fri, 17 Jun 2011 20:41:38 -0600
On 17 Jun 2011, at 19:45, Scott Ellsworth wrote:
That seems a bit strange - have you put the code up somewhere?
No, not yet. I might post something here over the weekend. It's
puzzled me a bit for a year or so off and on now.
Stephen
Scott
On Fri, Jun 17, 2011 at 4:24 PM, Stephen Blinkhorn
<email@hidden> wrote:
On 17 Jun 2011, at 10:30, Stephen Blinkhorn wrote:
Saying that, I've found that the CPU requirements of the raw
drawing code
(even with relatively fast refresh rates of 20-25 FPS) pales into
insignificance when compared to the objective-c messaging overhead
of
co-ordinating the redrawing. Cocoa seems to need to do a lot of
leg work
with respect to view drawing.
Just to clarify that last sentence. I'm referring to the CPU
requirements of
drawing relatively simple graphics e.g. bezier paths, filled rects
and some
CGLayers (not 10,000 X 10,000 areas of noise!).
Stephen
Anyway, glad I learnt all about CIImage!
Thanks,
Stephen
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://groups.yahoo.com/group/mac-gui-dev/
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