Hi all,
apologies for the false alarm...
Today I found out that during my comparison tests between CGShading and CGGradient, there was a bug in my methodology
that made CGGradient perform very slow.
After new tests with the correct methodology CGGradient performance is indeed similar to the one of CGShading.
Sorry for the confusion and thanks to all who replied to this thread.
Best.
- Luigi
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----- Original Message ----
From: David Duncan <email@hidden>
To: Luigi Castelli <email@hidden>
Cc: email@hidden
Sent: Wednesday, March 12, 2008 1:32:07 PM
Subject: Re: CGGradient VS CGShading
On Mar 12, 2008, at 1:01 PM, Luigi Castelli wrote:
> Well, the results suggest that the CGGradient approach is more than
> 20 times slower than CGShading.
> I am guessing that has to do with the fact that with CGGradient the
> user is forced to calculate the geometry of the gradient at drawing
> time,
> whereas CGShading can do that at object creation time.
I just explored this with the Quartz2DShadings sample and found that
there was virtually no difference between the two methods in
performance today for either linear or radial shadings. Could you
expand some on your methodology? (including source code if possible)
--
David Duncan
Apple DTS Animation and Printing
email@hidden
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