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Pods/DynamicBlurView/Sources/DynamicBlurView/BlurLayer.swift

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+//
+//  BlurLayer.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/14.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+private extension CGRect {
+    func rectangle(_ s: CGSize) -> CGRect {
+        let x = origin.x / s.width
+        let y = origin.y / s.height
+        let width = size.width / s.width
+        let height = size.height / s.height
+        return CGRect(x: x, y: y, width: width, height: height)
+    }
+}
+
+class BlurLayer: CALayer {
+    private static let blurRadiusKey = "blurRadius"
+    private static let blurLayoutKey = "blurLayout"
+    @NSManaged var blurRadius: CGFloat
+    @NSManaged private var blurLayout: CGFloat
+
+    private var fromBlurRadius: CGFloat?
+    var presentationRadius: CGFloat {
+        if let radius = fromBlurRadius {
+            if let layer = presentation() {
+                return layer.blurRadius
+            } else {
+                return radius
+            }
+        } else {
+            return blurRadius
+        }
+    }
+
+    override class func needsDisplay(forKey key: String) -> Bool {
+        if key == blurRadiusKey || key == blurLayoutKey {
+            return true
+        }
+        return super.needsDisplay(forKey: key)
+    }
+
+    open override func action(forKey event: String) -> CAAction? {
+        if event == BlurLayer.blurRadiusKey {
+            fromBlurRadius = nil
+
+            if let action = super.action(forKey: "opacity") as? CABasicAnimation {
+                fromBlurRadius = (presentation() ?? self).blurRadius
+
+                action.keyPath = event
+                action.fromValue = fromBlurRadius
+                return action
+            }
+        }
+
+        if event == BlurLayer.blurLayoutKey, let action = super.action(forKey: "opacity") as? CABasicAnimation {
+            action.keyPath = event
+            action.fromValue = 0
+            action.toValue = 1
+            return action
+        }
+
+        return super.action(forKey: event)
+    }
+}
+
+extension BlurLayer {
+    func draw(_ image: UIImage, fixes isFixes: Bool, baseLayer: CALayer?) {
+        contents = image.cgImage
+        contentsScale = image.scale
+
+        if isFixes, let blurLayer = presentation() {
+            contentsRect = blurLayer.convert(blurLayer.bounds, to: baseLayer).rectangle(image.size)
+        }
+    }
+
+    func refresh() {
+        fromBlurRadius = nil
+    }
+
+    func animate() {
+        UIView.performWithoutAnimation {
+            blurLayout = 0
+        }
+        blurLayout = 1
+    }
+
+    func render(in context: CGContext, for layer: CALayer) {
+        let layers = hideOverlappingLayers(layer.sublayers)
+        layer.render(in: context)
+        layers.forEach {
+            $0.isHidden = false
+        }
+    }
+
+    private func hideOverlappingLayers(_ layers: [CALayer]?) -> [CALayer] {
+        var hiddenLayers: [CALayer] = []
+        guard let layers = layers else {
+            return hiddenLayers
+        }
+
+        for layer in layers.reversed() {
+            if isHang(to: layer) {
+                return hiddenLayers + hideOverlappingLayers(layer.sublayers)
+            }
+            if layer.isHidden == false {
+                layer.isHidden = true
+                hiddenLayers.append(layer)
+            }
+            if layer == self {
+                return hiddenLayers
+            }
+        }
+        return hiddenLayers
+    }
+
+    private func isHang(to target: CALayer) -> Bool {
+        var layer = superlayer
+        while layer != nil {
+            if layer == target {
+                return true
+            }
+            layer = layer?.superlayer
+        }
+        return false
+    }
+}

Pods/DynamicBlurView/Sources/DynamicBlurView/CGContext+CGImage.swift

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+//
+//  CGContext+CGImage.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/17.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+extension CGContext {
+    static func imageContext(with quality: CaptureQuality, rect: CGRect, opaque: Bool) -> CGContext? {
+        UIGraphicsBeginImageContextWithOptions(rect.size, opaque, quality.imageScale)
+        guard let context = UIGraphicsGetCurrentContext() else {
+            return nil
+        }
+
+        context.translateBy(x: -rect.origin.x, y: -rect.origin.y)
+        context.interpolationQuality = quality.interpolationQuality
+
+        return context
+    }
+
+    func makeImage(with blendColor: UIColor?, blendMode: CGBlendMode, size: CGSize) -> CGImage? {
+        if let color = blendColor {
+            setFillColor(color.cgColor)
+            setBlendMode(blendMode)
+            fill(CGRect(origin: .zero, size: size))
+        }
+
+        return makeImage()
+    }
+}

Pods/DynamicBlurView/Sources/DynamicBlurView/CGImage+Accelerate.swift

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+//
+//  CGImage+Accelerate.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/17.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import Accelerate
+import UIKit
+
+extension CGImage {
+    var area: Int {
+        return width * height
+    }
+
+    private var size: CGSize {
+        return CGSize(width: width, height: height)
+    }
+
+    private var bytes: Int {
+        return bytesPerRow * height
+    }
+
+    private func imageBuffer(from data: UnsafeMutableRawPointer!) -> vImage_Buffer {
+        return vImage_Buffer(data: data, height: vImagePixelCount(height), width: vImagePixelCount(width), rowBytes: bytesPerRow)
+    }
+
+    func blurred(with boxSize: UInt32, iterations: Int, blendColor: UIColor?, blendMode: CGBlendMode) -> CGImage? {
+        guard let providerData = dataProvider?.data else {
+            return nil
+        }
+
+        let inData = malloc(bytes)
+        var inBuffer = imageBuffer(from: inData)
+
+        let outData = malloc(bytes)
+        var outBuffer = imageBuffer(from: outData)
+
+        let tempSize = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, nil, 0, 0, boxSize, boxSize, nil, vImage_Flags(kvImageEdgeExtend + kvImageGetTempBufferSize))
+        let tempData = malloc(tempSize)
+
+        defer {
+            free(inData)
+            free(outData)
+            free(tempData)
+        }
+
+        let source = CFDataGetBytePtr(providerData)
+        memcpy(inBuffer.data, source, bytes)
+
+        for _ in 0..<iterations {
+            vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, tempData, 0, 0, boxSize, boxSize, nil, vImage_Flags(kvImageEdgeExtend))
+
+            let temp = inBuffer.data
+            inBuffer.data = outBuffer.data
+            outBuffer.data = temp
+        }
+
+        let context = colorSpace.flatMap {
+            CGContext(data: inBuffer.data, width: width, height: height, bitsPerComponent: bitsPerComponent, bytesPerRow: bytesPerRow, space: $0, bitmapInfo: bitmapInfo.rawValue)
+        }
+
+        return context?.makeImage(with: blendColor, blendMode: blendMode, size: size)
+    }
+}

Pods/DynamicBlurView/Sources/DynamicBlurView/CaptureQuality.swift

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+//
+//  CaptureQuality.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/17.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+public enum CaptureQuality {
+    case `default`
+    case low
+    case medium
+    case high
+
+    var imageScale: CGFloat {
+        switch self {
+        case .default, .high:
+            return 0
+        case .low, .medium:
+            return  1
+        }
+    }
+
+    var interpolationQuality: CGInterpolationQuality {
+        switch self {
+        case .default, .low:
+            return .none
+        case .medium, .high:
+            return .default
+        }
+    }
+}

Pods/DynamicBlurView/Sources/DynamicBlurView/DynamicBlurView.h

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+//
+//  DynamicBlurView.h
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2015/04/08.
+//  Copyright (c) 2015年 kyohei_ito. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for DynamicBlurView.
+FOUNDATION_EXPORT double DynamicBlurViewVersionNumber;
+
+//! Project version string for DynamicBlurView.
+FOUNDATION_EXPORT const unsigned char DynamicBlurViewVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <DynamicBlurView/PublicHeader.h>
+
+

Pods/DynamicBlurView/Sources/DynamicBlurView/DynamicBlurView.swift

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+//
+//  DynamicBlurView.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2015/04/08.
+//  Copyright (c) 2015年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+open class DynamicBlurView: UIView {
+    open override class var layerClass : AnyClass {
+        return BlurLayer.self
+    }
+
+    private var staticImage: UIImage?
+    private var displayLink: CADisplayLink?
+    private var blurLayer: BlurLayer {
+        return layer as! BlurLayer
+    }
+    private let mainQueue = DispatchQueue.main
+    private let globalQueue: DispatchQueue = {
+        if #available (iOS 8.0, *) {
+            return .global(qos: .userInteractive)
+        } else {
+            return .global(priority: .high)
+        }
+    }()
+    private var renderingTarget: UIView? {
+        if isDeepRendering {
+            return window
+        } else {
+            return superview
+        }
+    }
+
+    /// When true, it captures displays image and blur it asynchronously. Try to set true if needs more performance.
+    /// Asynchronous drawing is possibly crash when needs to process on main thread that drawing with animation for example.
+    open var drawsAsynchronously: Bool = false
+    /// Radius of blur.
+    open var blurRadius: CGFloat {
+        set { blurLayer.blurRadius = newValue }
+        get { return blurLayer.blurRadius }
+    }
+    /// Default is none.
+    open var trackingMode: TrackingMode = .none {
+        didSet {
+            if trackingMode != oldValue {
+                linkForDisplay()
+            }
+        }
+    }
+    /// Blend color.
+    open var blendColor: UIColor?
+	/// Blend mode.
+    open var blendMode: CGBlendMode = .plusLighter
+    /// Default is 3.
+    open var iterations: Int = 3
+    /// If the view want to render beyond the layer, should be true.
+    open var isDeepRendering: Bool = false
+    /// When none of tracking mode, it can change the radius of blur with the ratio. Should set from 0 to 1.
+    open var blurRatio: CGFloat = 1 {
+        didSet {
+            if let image = staticImage, oldValue != blurRatio {
+                draw(image, blurRadius: blurRadius, fixes: false, baseLayer: renderingTarget?.layer)
+            }
+        }
+    }
+    /// Quality of captured image.
+    open var quality: CaptureQuality = .medium
+
+    public override init(frame: CGRect) {
+        super.init(frame: frame)
+        isUserInteractionEnabled = false
+    }
+
+    public required init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        isUserInteractionEnabled = false
+    }
+
+    open override func didMoveToWindow() {
+        super.didMoveToWindow()
+
+        if let view = renderingTarget, window != nil && trackingMode == .none {
+            staticImage = snapshotImage(for: view.layer, conversion: !isDeepRendering)
+        }
+    }
+
+    open override func didMoveToSuperview() {
+        super.didMoveToSuperview()
+
+        if superview == nil {
+            displayLink?.invalidate()
+            displayLink = nil
+        } else {
+            linkForDisplay()
+        }
+    }
+
+    private func async(on queue: DispatchQueue, actions: @escaping () -> Void) {
+        if drawsAsynchronously {
+            queue.async(execute: actions)
+        } else {
+            actions()
+        }
+    }
+
+    private func sync(on queue: DispatchQueue, actions: () -> Void) {
+        if drawsAsynchronously {
+            queue.sync(execute: actions)
+        } else {
+            actions()
+        }
+    }
+
+    private func draw(_ image: UIImage, blurRadius radius: CGFloat, fixes isFixes: Bool, baseLayer: CALayer?) {
+        async(on: globalQueue) { [weak self] in
+            if let me = self, let blurredImage = image.blurred(radius: radius, iterations: me.iterations, ratio: me.blurRatio, blendColor: me.blendColor, blendMode: me.blendMode) {
+                me.sync(on: me.mainQueue) {
+                    me.blurLayer.draw(blurredImage, fixes: isFixes, baseLayer: baseLayer)
+                }
+            }
+        }
+    }
+
+    private func blurLayerRect(to layer: CALayer, conversion: Bool) -> CGRect {
+        if conversion {
+            let presentationLayer = blurLayer.presentation() ?? blurLayer
+            return presentationLayer.convert(presentationLayer.bounds, to: layer)
+        } else {
+            return layer.bounds
+        }
+    }
+
+    private func snapshotImage(for layer: CALayer, conversion: Bool) -> UIImage? {
+        let rect = blurLayerRect(to: layer, conversion: conversion)
+        guard let context = CGContext.imageContext(with: quality, rect: rect, opaque: isOpaque) else {
+            return nil
+        }
+
+        blurLayer.render(in: context, for: layer)
+
+        defer {
+            UIGraphicsEndImageContext()
+        }
+
+        return UIGraphicsGetImageFromCurrentImageContext()
+    }
+}
+
+extension DynamicBlurView {
+    open override func display(_ layer: CALayer) {
+        let blurRadius = blurLayer.presentationRadius
+        let isFixes = isDeepRendering && staticImage != nil
+        if let view = renderingTarget, let image = staticImage ?? snapshotImage(for: view.layer, conversion: !isFixes) {
+            draw(image, blurRadius: blurRadius, fixes: isFixes, baseLayer: view.layer)
+        }
+    }
+}
+
+extension DynamicBlurView {
+    private func linkForDisplay() {
+        displayLink?.invalidate()
+        displayLink = UIScreen.main.displayLink(withTarget: self, selector: #selector(DynamicBlurView.displayDidRefresh(_:)))
+        displayLink?.add(to: .main, forMode: RunLoop.Mode(rawValue: trackingMode.description))
+    }
+
+    @objc private func displayDidRefresh(_ displayLink: CADisplayLink) {
+        display(layer)
+    }
+}
+
+extension DynamicBlurView {
+    /// Remove cache of blur image then get it again.
+    open func refresh() {
+        blurLayer.refresh()
+        staticImage = nil
+        blurRatio = 1
+        display(layer)
+    }
+
+    /// Remove cache of blur image.
+    open func remove() {
+        blurLayer.refresh()
+        staticImage = nil
+        blurRatio = 1
+        layer.contents = nil
+    }
+
+    /// Should use when needs to change layout with animation when is set none of tracking mode.
+    public func animate() {
+        blurLayer.animate()
+    }
+}

Pods/DynamicBlurView/Sources/DynamicBlurView/TrackingMode.swift

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+//
+//  TrackingMode.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/17.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+public enum TrackingMode: CustomStringConvertible {
+    case tracking
+    case common
+    case none
+
+    public var description: String {
+        switch self {
+        case .tracking:
+            return RunLoop.Mode.tracking.rawValue
+        case .common:
+            return RunLoop.Mode.common.rawValue
+        case .none:
+            return ""
+        }
+    }
+}
+

Pods/DynamicBlurView/Sources/DynamicBlurView/UIImage+Blur.swift

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+//
+//  UIImage+Blur.swift
+//  DynamicBlurView
+//
+//  Created by Kyohei Ito on 2017/08/11.
+//  Copyright © 2017年 kyohei_ito. All rights reserved.
+//
+
+import UIKit
+
+public extension UIImage {
+    func blurred(radius: CGFloat, iterations: Int, ratio: CGFloat, blendColor color: UIColor?, blendMode mode: CGBlendMode) -> UIImage? {
+        guard let cgImage = cgImage else {
+            return nil
+        }
+
+        if cgImage.area <= 0 || radius <= 0 {
+            return self
+        }
+
+        var boxSize = UInt32(radius * scale * ratio)
+        if boxSize % 2 == 0 {
+            boxSize += 1
+        }
+
+        return cgImage.blurred(with: boxSize, iterations: iterations, blendColor: color, blendMode: mode).map {
+            UIImage(cgImage: $0, scale: scale, orientation: imageOrientation)
+        }
+    }
+}