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AliSoftware/Image+Outline-CIFilter.swift

Created May 26, 2023 16:01
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  1. AliSoftware created this gist May 26, 2023.
    77 changes: 77 additions & 0 deletions Image+Outline-CIFilter.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,77 @@
    import SwiftUI
    import UIKit
    import CoreImage
    import PlaygroundSupport


    extension CIImage {
    convenience init(_ uiImage: UIImage) {
    if let cgImage = uiImage.cgImage {
    self.init(cgImage: cgImage)
    } else {
    self.init()
    }
    }

    func bloom(intensity: Float = 1.0, radius: Float = 2) -> CIImage {
    let ctx = CIContext()
    guard let filter = CIFilter(name: "CIBloom") else { fatalError("Filter Unavailable") }
    filter.setValue(self, forKey: kCIInputImageKey)
    filter.setValue(intensity, forKey: kCIInputIntensityKey)
    filter.setValue(radius, forKey: kCIInputRadiusKey)
    return filter.outputImage ?? CIImage.empty()
    }

    func edges(intensity: Float = 1.0) -> CIImage {
    let ctx = CIContext()
    guard let filter = CIFilter(name: "CIEdges") else { fatalError("Filter Unavailable") }
    filter.setValue(self, forKey: kCIInputImageKey)
    filter.setValue(intensity, forKey: kCIInputIntensityKey)
    return filter.outputImage ?? CIImage.empty()
    }
    }


    extension Image {
    init(_ cgImage: CGImage) {
    self.init(cgImage, scale: 1.0, orientation: .up, label: Text(""))
    }
    init(_ uiImage: UIImage) {
    guard let cgImage = uiImage.cgImage else { fatalError("Nil CGImage for UIImage") }
    self.init(cgImage)
    }
    init(_ ciImage: CIImage) {
    let context = CIContext(options: nil)
    if let cgImage = context.createCGImage(ciImage, from: ciImage.extent) {
    self.init(cgImage, scale: 1.0, orientation: .up, label: Text(""))
    } else {
    self.init(systemName: "unknown")
    }
    }
    }

    struct BorderedSymbol: View {
    let symbolName: String
    let symbolColor: Color
    let borderColor: Color

    var body: some View {
    let image = UIImage(systemName: symbolName)!
    let edged = CIImage(image).edges().bloom()
    ZStack {
    Image(edged)
    .renderingMode(.template)
    .foregroundColor(borderColor)
    Image(image)
    .renderingMode(.template)
    .foregroundColor(symbolColor)
    }
    }
    }

    let bordered = BorderedSymbol(symbolName: "pin.circle", symbolColor: .orange, borderColor: .blue)
    .imageScale(.large)
    .scaleEffect(1.0)
    .frame(width: 100, height: 100)

    PlaygroundPage.current.setLiveView(bordered)