f2cf74c7
 yangbin
1.0.20(4)
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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)
}
}
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