init(source:)

Creates a custom blend kernel from a program string.

Declaration

convenience init?(source string: String)

Parameters

string:
A program in the Core Image Kernel Language that contains a single routine marked using the kernel keyword.

Return Value

A new blend kernel object, or nil if the specified source code does not contain a valid blend kernel routine.

Discussion

This method is similar to the init(source:) 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.