Creates a custom blend kernel from a program string.
Mac Catalyst 13.0–13.0Deprecated
A program in the Core Image Kernel Language that contains a single routine marked using the kernel keyword.
A new blend kernel object, or nil if the specified source code does not contain a valid blend kernel routine.
This method is similar to the kernelWithString: method of the superclass CIKernel, but creates only blend kernels. Use this method when you want to ensure that the type of kernel object returned (if any) is always CIBlendKernel.
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