MacOS and Swift 3 - how to pass result from one filter to another

Question

Expanding question from this thread. I'm not sure how to pass the result from CIAffineClamp as a source for CIGaussianBlur. The following code builds just fine but does not yield a resulting image.

guard
    let blurFilter = CIFilter(name: "CIGaussianBlur"),
    let clampFilter = CIFilter(name: "CIAffineClamp"),
    let imageURL = Bundle.main.url(forResource: "my-image", withExtension: "png"),
    let ciImage = CIImage(contentsOf: imageURL)
else {
    return
}

let transform = AffineTransform.identity

clampFilter.setValue(ciImage, forKey: "inputImage")
clampFilter.setValue(NSAffineTransform(transform: transform), forKey: "inputTransform")

blurFilter.setValue(clampFilter.outputImage, forKey: kCIInputImageKey)
blurFilter.setValue(10, forKey: kCIInputRadiusKey)

guard
    let result = blurFilter.outputImage,
    let cgImage = context.createCGImage(result, from: result.extent)
else {
    // this guard fails in here
    return
}

Answer 1

Seems to be the same issue with this:

CIGaussianBlur and CIAffineClamp on iOS 6

Please try this:

    let cgImage = context.createCGImage(result, from: ciImage.extent)