An odd issue when using [QCCompositionLayer setSpeed] method
An odd issue when using [QCCompositionLayer setSpeed] method
- Subject: An odd issue when using [QCCompositionLayer setSpeed] method
- From: "Cloud.Student" <email@hidden>
- Date: Fri, 25 Jan 2008 22:01:15 +0000
Hi everyone.
I came across an very odd issue when using [QCCompositionLayer
setSpeed] method.
For example, when I create an QCCompositionLayer instance to render a
Quartz Composer composition, there is a requirement to adjust the
animation display speed.
So I set the rendering speed using the API function mentioned above to
let the composition render more slowly, for example, [_QCLayerInstance
setSpeed:0.0]. Yes, this will make the layer pause rendering.
However, l noticed a rapid flash when the function executed at this
point. The layer becomes blank for a very short while, maybe 0.1~0.3
seconds and return to be normal.
Sorry for my bad description. Maybe an experiment by yourself will
make yourself understand my meaning well.
I am wondering maybe it is related to my graphic card if you don't
come across this issue. I am using a Mac Pro with nVidia 7300GT.
Thank you very much for any help.
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