Re: QD -> Quartz = poor performance

On Dec 21, 2006, at 10:37 PM, David M. Cotter wrote:

> > can i keep that imageRef around forever, and whenever I  
> > CGContextDrawImage it gets the bits from the provider??
> > that way i don't have to keep allocate / blit / deallocate per frame?
>
> okay i answered my own question.  the answer is no.  i also found  
> out that there is no time spent in the calls to create the CGImage,  
> all the time is spent in the call to draw it.  (ie: even if i ONLY  
> call CGContextDrawImage() on each frame, using a pre-created image,  
> i still get 9 fps.

That's definitely strange, and I'm at a loss to explain that right  
this moment... I do have an app that is drawing a sample image that  
is rotating about it's center and I'm getting better than 30 fps.
--
Reality is what, when you stop believing in it, doesn't go away.
Failure is not an option. It is a privilege reserved for those who try.

David Duncan

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