93 lines
3.5 KiB
Swift
93 lines
3.5 KiB
Swift
//
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// UIImage.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/3/8.
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//
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import CoreImage
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import CoreImage.CIFilterBuiltins
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import UIKit
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extension UIImage {
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public static func placeholder(size: CGSize = CGSize(width: 1, height: 1), color: UIColor) -> UIImage {
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let render = UIGraphicsImageRenderer(size: size)
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return render.image { (context: UIGraphicsImageRendererContext) in
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context.cgContext.setFillColor(color.cgColor)
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context.fill(CGRect(origin: .zero, size: size))
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}
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}
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}
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// refs: https://www.hackingwithswift.com/example-code/media/how-to-read-the-average-color-of-a-uiimage-using-ciareaaverage
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extension UIImage {
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@available(iOS 14.0, *)
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public var dominantColor: UIColor? {
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guard let inputImage = CIImage(image: self) else { return nil }
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let filter = CIFilter.areaAverage()
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filter.inputImage = inputImage
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filter.extent = inputImage.extent
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guard let outputImage = filter.outputImage else { return nil }
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var bitmap = [UInt8](repeating: 0, count: 4)
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let context = CIContext(options: [.workingColorSpace: kCFNull])
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context.render(outputImage, toBitmap: &bitmap, rowBytes: 4, bounds: CGRect(x: 0, y: 0, width: 1, height: 1), format: .RGBA8, colorSpace: nil)
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return UIColor(red: CGFloat(bitmap[0]) / 255, green: CGFloat(bitmap[1]) / 255, blue: CGFloat(bitmap[2]) / 255, alpha: CGFloat(bitmap[3]) / 255)
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}
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}
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extension UIImage {
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public var domainLumaCoefficientsStyle: UIUserInterfaceStyle? {
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guard let brightness = cgImage?.brightness else { return nil }
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return brightness > 100 ? .light : .dark // 0 ~ 255
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}
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}
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extension UIImage {
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public func blur(radius: CGFloat) -> UIImage? {
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guard let inputImage = CIImage(image: self) else { return nil }
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let blurFilter = CIFilter.gaussianBlur()
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blurFilter.inputImage = inputImage
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blurFilter.radius = Float(radius)
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guard let outputImage = blurFilter.outputImage else { return nil }
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guard let cgImage = CIContext().createCGImage(outputImage, from: outputImage.extent) else { return nil }
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let image = UIImage(cgImage: cgImage, scale: scale, orientation: imageOrientation)
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return image
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}
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}
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extension UIImage {
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public func withRoundedCorners(radius: CGFloat? = nil) -> UIImage? {
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let maxRadius = min(size.width, size.height) / 2
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let cornerRadius: CGFloat = {
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guard let radius = radius, radius > 0 else { return maxRadius }
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return min(radius, maxRadius)
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}()
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let render = UIGraphicsImageRenderer(size: size)
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return render.image { (_: UIGraphicsImageRendererContext) in
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let rect = CGRect(origin: .zero, size: size)
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UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius).addClip()
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draw(in: rect)
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}
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}
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}
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extension UIImage {
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public static func adaptiveUserInterfaceStyleImage(lightImage: UIImage, darkImage: UIImage) -> UIImage {
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let imageAsset = UIImageAsset()
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imageAsset.register(lightImage, with: UITraitCollection(traitsFrom: [
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UITraitCollection(displayScale: 1.0),
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UITraitCollection(userInterfaceStyle: .light)
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]))
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imageAsset.register(darkImage, with: UITraitCollection(traitsFrom: [
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UITraitCollection(displayScale: 1.0),
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UITraitCollection(userInterfaceStyle: .dark)
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]))
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return imageAsset.image(with: UITraitCollection.current)
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}
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}
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