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feat(blur-processing): change to Metal API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,74 +1,65 @@ | ||
| // | ||
| // UIImage+Blur.swift | ||
| // ShadowView | ||
| // | ||
| // Created by Pierre Perrin on 25/07/2017. | ||
| // Copyright © 2017 Pierreperrin. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
| import CoreGraphics | ||
| import CoreImage | ||
| import Metal | ||
| import UIKit | ||
|
|
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| extension UIImage{ | ||
|
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| /// Resize the image to a centain percentage | ||
| extension UIImage { | ||
| /// Resize the image to a certain percentage | ||
| /// | ||
| /// - Parameter percentage: Percentage value | ||
| /// - Returns: UIImage(Optional) | ||
| func resized(withPercentage percentage: CGFloat) -> UIImage? { | ||
| let canvasSize = size.scaled(by: percentage) | ||
| UIGraphicsBeginImageContextWithOptions(canvasSize, false, scale) | ||
| defer { UIGraphicsEndImageContext() } | ||
| draw(in: CGRect(origin: .zero, size: canvasSize)) | ||
| return UIGraphicsGetImageFromCurrentImageContext() | ||
| return resized(toSize: size.scaled(by: percentage)) | ||
| } | ||
|
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|
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| /// Resize the image to a certain width, maintaining aspect ratio | ||
| /// | ||
| /// - Parameter width: Desired width | ||
| /// - Returns: UIImage(Optional) | ||
| func resized(toWidth width: CGFloat) -> UIImage? { | ||
| let canvasSize = CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height))) | ||
| UIGraphicsBeginImageContextWithOptions(canvasSize, false, scale) | ||
| let height = CGFloat(ceil(width / size.width * size.height)) | ||
| return resized(toSize: CGSize(width: width, height: height)) | ||
| } | ||
|
|
||
| /// Apply a Gaussian blur to the image using Metal GPU acceleration | ||
| /// | ||
| /// - Parameter blurRadius: The blur radius | ||
| /// - Returns: UIImage(Optional) | ||
| func applyBlur(blurRadius: CGFloat) -> UIImage? { | ||
| guard let ciImage = CIImage(image: self) else { return nil } | ||
| guard let filter = CIFilter(name: "CIGaussianBlur") else { return nil } | ||
|
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| filter.setValue(ciImage, forKey: kCIInputImageKey) | ||
| filter.setValue(blurRadius, forKey: kCIInputRadiusKey) | ||
|
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| // Create a Metal-backed CIContext for GPU acceleration | ||
| guard let device = MTLCreateSystemDefaultDevice() else { return nil } | ||
| let context = CIContext(mtlDevice: device) | ||
|
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| guard let output = filter.outputImage else { return nil } | ||
| guard let cgImage = context.createCGImage(output, from: ciImage.extent) else { return nil } | ||
|
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| return UIImage(cgImage: cgImage) | ||
| } | ||
|
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| /// General method for resizing an image to a specific size | ||
| /// | ||
| /// - Parameter size: Target size | ||
| /// - Returns: UIImage(Optional) | ||
| private func resized(toSize size: CGSize) -> UIImage? { | ||
| UIGraphicsBeginImageContextWithOptions(size, false, scale) | ||
| defer { UIGraphicsEndImageContext() } | ||
| draw(in: CGRect(origin: .zero, size: canvasSize)) | ||
| draw(in: CGRect(origin: .zero, size: size)) | ||
| return UIGraphicsGetImageFromCurrentImageContext() | ||
| } | ||
|
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|
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| func applyBlur(blurRadius:CGFloat) -> UIImage?{ | ||
|
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| guard let ciImage = CIImage(image: self) else {return nil} | ||
|
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| if let filter = CIFilter(name: "CIGaussianBlur") { | ||
|
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| filter.setValue(ciImage, forKey: kCIInputImageKey) | ||
| filter.setValue(blurRadius, forKey: kCIInputRadiusKey) | ||
| let eaglContext = | ||
| EAGLContext(api: EAGLRenderingAPI.openGLES3) | ||
| ?? EAGLContext(api: EAGLRenderingAPI.openGLES2) | ||
| ?? EAGLContext(api: EAGLRenderingAPI.openGLES1) | ||
|
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| let context = eaglContext == nil ? | ||
| CIContext(options: nil) | ||
| : CIContext(eaglContext: eaglContext!) | ||
|
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| if let output = filter.outputImage, | ||
| let cgimg = context.createCGImage(output, from: ciImage.extent) | ||
| { | ||
| return UIImage(cgImage: cgimg) | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
| } | ||
|
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| extension CGSize { | ||
|
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| /// Generates a new size that is this size scaled by a cerntain percentage | ||
| /// Generates a new size that is this size scaled by a certain percentage | ||
| /// | ||
| /// - Parameter percentage: the percentage to scale to | ||
| /// - Returns: a new CGSize instance by scaling self by the given percentage | ||
| /// - Parameter percentage: The percentage to scale to | ||
| /// - Returns: A new CGSize instance by scaling self by the given percentage | ||
| func scaled(by percentage: CGFloat) -> CGSize { | ||
| return CGSize(width: width * percentage, height: height * percentage) | ||
| } | ||
|
|
||
| } |