apply(withTiledExtent:inputs:arguments:)

Call this method on your Core Image Processor Kernel subclass to create a new image based on an array of tile extents that together cover the output.

Declaration

class func apply(withTiledExtent tileExtents: [CIVector], inputs: [CIImage]?, arguments args: [String : Any]?) throws -> CIImage

Parameters

tileExtents:
The array of bounding rectangles that the CIImageProcessorKernel can produce. Each rectangle in the array is an object created using /CIVector/vectorWithCGRect: This method will return CIImage.emptyImage if the rectangles in the array have gaps or overlaps.
inputs:
An array of Ciimage objects to use as input.

Return Value

An autoreleased CIImage

Discussion

Each tile is a CGRect encoded as a CIVector using +[CIVector vectorWithCGRect:]. The overall output extent is computed as the union of all tile extents.

This method will return nil and an error if:

calling outputFormat on your subclass returns an unsupported format.
calling formatForInput(at:) on your subclass returns an unsupported format.
your subclass does not implement process(with:arguments:output:)