Error in CoreImage Wrapper colorOverlay function

[karthikgs7]

When, I call the colorGenerator and compositeSourceOver, separately, it works fine. I got error only, when I calling colorOverlay function.

[pauluhn]

Also getting an error...

Based on https://github.com/objcio/functional-programming-in-swift/issues/77, I switched to a CIColor as the input color but still getting error.

I notice that in https://github.com/objcio/issue-16-functional-apis/blob/master/FunctionalCoreImage/CoreImage.swift, you unwrap the CIColor but when I try to, it says its a non-optional.

[huangsemao]

To fix this problem need set size for output image in CIConstantColorGenerator filter, try this function

func colorGenerator(color: NSColor) -> Filter { return { image in guard let c = CIColor(color: color) else { fatalError() } let parameters = [kCIInputColorKey: c] guard let filter = CIFilter(name: "CIConstantColorGenerator", withInputParameters: parameters) else { fatalError() } guard let outputImage = filter.outputImage?.imageByCroppingToRect(image.extent) else { fatalError() } return outputImage } }

[trozware]

afterfriday's fix worked for me - thanks very much. This is really just applying the same crop as used in compositeSourceOverlay. I still had a problem due to my own typo in the filter name, so that is worth checking if things are going weird.

With the CIColor un-wrapping, if you are using an iOS playground with UIColor, the CIColor initialiser does not return an optional. If you are using an NSColor, it does.

[chriseidhof]

Thanks for all the comments everyone. Unfortunately, we can't do much about it until Apple fixes this =).