added iOS source code

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

diff --git a/iOS/Pods/Kingfisher/Sources/CacheSerializer.swift b/iOS/Pods/Kingfisher/Sources/CacheSerializer.swift
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+//
+//  CacheSerializer.swift
+//  Kingfisher
+//
+//  Created by Wei Wang on 2016/09/02.
+//
+//  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
+
+/// An `CacheSerializer` would be used to convert some data to an image object for 
+/// retrieving from disk cache and vice versa for storing to disk cache.
+public protocol CacheSerializer {
+    
+    /// Get the serialized data from a provided image
+    /// and optional original data for caching to disk.
+    ///
+    ///
+    /// - parameter image:    The image needed to be serialized.
+    /// - parameter original: The original data which is just downloaded. 
+    ///                       If the image is retrieved from cache instead of
+    ///                       downloaded, it will be `nil`.
+    ///
+    /// - returns: A data which will be stored to cache, or `nil` when no valid
+    ///            data could be serialized.
+    func data(with image: Image, original: Data?) -> Data?
+    
+    /// Get an image deserialized from provided data.
+    ///
+    /// - parameter data:    The data from which an image should be deserialized.
+    /// - parameter options: Options for deserialization.
+    ///
+    /// - returns: An image deserialized or `nil` when no valid image 
+    ///            could be deserialized.
+    func image(with data: Data, options: KingfisherOptionsInfo?) -> Image?
+}
+
+
+/// `DefaultCacheSerializer` is a basic `CacheSerializer` used in default cache of
+/// Kingfisher. It could serialize and deserialize PNG, JEPG and GIF images. For 
+/// image other than these formats, a normalized `pngRepresentation` will be used.
+public struct DefaultCacheSerializer: CacheSerializer {
+    
+    public static let `default` = DefaultCacheSerializer()
+    private init() {}
+    
+    public func data(with image: Image, original: Data?) -> Data? {
+        let imageFormat = original?.kf.imageFormat ?? .unknown
+
+        let data: Data?
+        switch imageFormat {
+        case .PNG: data = image.kf.pngRepresentation()
+        case .JPEG: data = image.kf.jpegRepresentation(compressionQuality: 1.0)
+        case .GIF: data = image.kf.gifRepresentation()
+        case .unknown: data = original ?? image.kf.normalized.kf.pngRepresentation()
+        }
+
+        return data
+    }
+    
+    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)
+    }
+}