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Re: VU meter drawing performance

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Re: VU meter drawing performance

Subject: Re: VU meter drawing performance
From: Ethan Funk <email@hidden>
Date: Fri, 18 Dec 2009 11:41:08 -0700

Yep, that fixes the VU meter drawing! I though that by using setNeedsDisplay, one update would be popped off the queue per refresh cycle. But it looks like a refresh cycle refreshes ALL queued updates. I was not aware of the Quartz drawing penalty, but it does make sense from an OS point of view.

Thanks,
Ethan...

On Dec 18, 2009, at 11:23 AM, Kyle Sluder wrote:

On Fri, Dec 18, 2009 at 9:16 AM, Ethan Funk <email@hidden > wrote:

How can I get the displays to all update together?


This question would probably be better asked on the cocoa-dev list.
But basically, you should stop drawing directly, and instead use
-setNeedsDisplay: to cause a redraw at the next available refresh
cycle. Otherwise you might (that is to say, you probably will) outpace
the 60Hz refresh limit imposed by Quartz, which will then throttle
your drawing as a penalty.

--Kyle Sluder


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Re: VU meter drawing performance
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References:  
  >VU meter drawing performance (From: Ethan Funk <email@hidden>)
  >Re: VU meter drawing performance (From: Kyle Sluder <email@hidden>)




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