How to use CIFilterShape
I've searched far and wide and can't find a single example of how to use a CIFilterShape, and what it's good for. Most Apple docs just say it controls the dod of a filter, even the CoreImage Reference doesn't actually discuss how to use it.
A dumb simple assumption would be to use it transform the dimensions and offsets of a single rectangle and pass that shape directly to -[CIKernel applyWithExtent].
Such a usage wouldn't really create a stenciling effect though, which is what I would expect from a filter shape. Can anyone explain and perhaps provide some examples as to the actual usage of CIFilterShape?
It appears to be the corresponding type for the kCIApplyOptionDefinition key for the domain of definition (DoD) which I have only found referenced in WWDC10 session 426 slide 54 above. Here is a link to the slides as well.
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