added iOS source code

[wl-app.git] / iOS / Pods / Kingfisher / Sources / FormatIndicatedCacheSerializer.swift

diff --git a/iOS/Pods/Kingfisher/Sources/FormatIndicatedCacheSerializer.swift b/iOS/Pods/Kingfisher/Sources/FormatIndicatedCacheSerializer.swift
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+//
+//  RequestModifier.swift
+//  Kingfisher
+//
+//  Created by Junyu Kuang on 5/28/17.
+//
+//  Copyright (c) 2018 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import Foundation
+
+/// `FormatIndicatedCacheSerializer` let you indicate an image format for serialized caches.
+///
+/// It could serialize and deserialize PNG, JEPG and GIF images. For
+/// image other than these formats, a normalized `pngRepresentation` will be used.
+///
+/// Example:
+/// ````
+/// private let profileImageSize = CGSize(width: 44, height: 44)
+///
+/// private let imageProcessor = RoundCornerImageProcessor(
+///     cornerRadius: profileImageSize.width / 2, targetSize: profileImageSize)
+///
+/// private let optionsInfo: KingfisherOptionsInfo = [
+///     .cacheSerializer(FormatIndicatedCacheSerializer.png), 
+///     .backgroundDecode, .processor(imageProcessor), .scaleFactor(UIScreen.main.scale)]
+///
+/// extension UIImageView {
+///    func setProfileImage(with url: URL) {
+///        // Image will always cached as PNG format to preserve alpha channel for round rect.
+///        _ = kf.setImage(with: url, options: optionsInfo)
+///    }
+///}
+/// ````
+public struct FormatIndicatedCacheSerializer: CacheSerializer {
+    
+    public static let png = FormatIndicatedCacheSerializer(imageFormat: .PNG)
+    public static let jpeg = FormatIndicatedCacheSerializer(imageFormat: .JPEG)
+    public static let gif = FormatIndicatedCacheSerializer(imageFormat: .GIF)
+    
+    /// The indicated image format.
+    private let imageFormat: ImageFormat
+    
+    public func data(with image: Image, original: Data?) -> Data? {
+        
+        func imageData(withFormat imageFormat: ImageFormat) -> Data? {
+            switch imageFormat {
+            case .PNG: return image.kf.pngRepresentation()
+            case .JPEG: return image.kf.jpegRepresentation(compressionQuality: 1.0)
+            case .GIF: return image.kf.gifRepresentation()
+            case .unknown: return nil
+            }
+        }
+        
+        // generate data with indicated image format
+        if let data = imageData(withFormat: imageFormat) {
+            return data
+        }
+        
+        let originalFormat = original?.kf.imageFormat ?? .unknown
+        
+        // generate data with original image's format
+        if originalFormat != imageFormat, let data = imageData(withFormat: originalFormat) {
+            return data
+        }
+        
+        return original ?? image.kf.normalized.kf.pngRepresentation()
+    }
+    
+    /// Same implementation as `DefaultCacheSerializer`.
+    public func image(with data: Data, options: KingfisherOptionsInfo?) -> Image? {
+        let options = options ?? KingfisherEmptyOptionsInfo
+        return Kingfisher<Image>.image(
+            data: data,
+            scale: options.scaleFactor,
+            preloadAllAnimationData: options.preloadAllAnimationData,
+            onlyFirstFrame: options.onlyLoadFirstFrame)
+    }
+}