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the QC codec

I posted this to QuickTime-API last week... but perhaps this would be a useful place to ask also.

Mac OS X 10.4 includes a QuickTime component(s) to import/render Quartz Composer files (.qtz) as movies in realtime in applications such as QuickTime Player.

In addition, Technical Note TN2145 "Efficiently using Quartz Composer compositions with QuickTime" has a section labeled "Important differences with other forms of QuickTime media" and it states that "Quartz Composer back-end is implemented using OpenGL and renders directly on the display card for optimal performance."

Can anyone elucidate the architecture of the Quartz Composer component (s)? At a basic level, I'm guessing it implements both a MovieImport component and a GraphicsImporter component.

If that's true, then it seems the Quartz Composer frame will be ultimately be "displayed" using the ImageCodecBeginBand of the GraphicsImporter component. However, the ImageCodecBeginBand only receives a pointer to memory via the ImageSubCodecDecompressRecord structure passed to ImageCodecBeginBand. The information in TN2145, however, states that it is drawn directly to the graphics card (which I assume means directly to an OpenGL visual context). How does it do that?

Is there any manner in which 3rd parties can implement QuickTime import/decompressor components with the same performance as the Quartz Composer component(s)? If so, how? If not, are there plans to add this capability in the future, or should I file an enhancement request in radar?

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