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Re: Re QCCompositionLayer with transparent background Not Working


On Feb 25, 2008, at 11:20 PM, Steve Sheets wrote:

Dear Robert and other QCCompositionLayer programmers...

You have good timing. Having not touched this code since last fall, yesterday I started creating QCCompositionLayer code. The composition works fine if the background is solid, but when it is transparent, I see artifacts and flashing. This sounds identical to Roberts issues. Does anyone know what is going on? My QCCompositionLayer is on the screen with several other transparent CALayers, and they all need to behave nicely together.

Is this a known bug?

If you are clearing the composition, it's likely a bug in the QCCompositionLayer or CA itself. Please file a bug.

Second question, I am having problems having my own Quartz Composer composition animate in the above example. If I used one of the QC from the Composition Repository (ex. defocus) within my own program using QCCompositionLayer, then they animated perfectly. When I use my own composition, it does not. My compositions animated inside of Quartz Composer without any modifications. Is there a setting that I need to switch on for animation to work within a layer? I am not doing anything fancy, just some Particle System animation (yes, I am using QC to animate an About box).

Can you try adding the animation protocol to your composition and building LiveEdit in the developer examples? If the composition has the same problems there, could you send a sample composition to the list to look at? Otherwise, the bug may be in your QCCompositionLayer code.
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 >Re QCCompositionLayer with transparent background Not Working (From: Steve Sheets <email@hidden>)



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