MacOS 和 Swift 3 - 如何将结果从一个过滤器传递到另一个过滤器

Question

扩展的问题。我不确定如何将 CIAffineClamp 的结果作为 CIGaussianBlur 的来源传递。以下代码构建得很好，但不会生成结果图像。

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

似乎与此问题相同：

CIGaussianBlur and CIAffineClamp on iOS 6

请试试这个：

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

MacOS 和 Swift 3 - 如何将结果从一个过滤器传递到另一个过滤器

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

macos

swift3

nsimage