NSScreencast Episode #148 Function Composition with CI Filters

Function Composition with CI Filters - NSScreencast

Filterをfuncなどを使って実装

• typealias Filter = CIImage -> CIImage
• func
  • func sepia() -> Filter {
  • func blur(radius: Double) -> Filter {
  • func vortex(angle: Double) -> Filter {
    • CIFilter(name: "CIVortexDistortion"
    • vortex 渦、渦巻き
• Not readable only with func - too many parens
• composeFilters
  • infix operator • { associativity left }
  • func •(f1: Filter, f2: Filter) -> Filter {
    • return {
      • image in
      • f2(f1(image))
  • let filter = sepia() • blur(4.0) • vortex(200)
  • let output = filter(cimg)

funcの中身よくわからない

    return {
        image in
        let filter = CIFilter(name: "CIGaussianBlur", withInputParameters: [
            kCIInputImageKey: image,