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Added FormatIndicatedCacheSerializer
FormatIndicatedCacheSerializer let you indicate an image format for serialized caches.
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Jonny
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Jonny
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May 31, 2017
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| // | ||
| // RequestModifier.swift | ||
| // Kingfisher | ||
| // | ||
| // Created by Junyu Kuang on 5/28/17. | ||
| // | ||
| // Copyright (c) 2017 Wei Wang <[email protected]> | ||
| // | ||
| // 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. | ||
|
|
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| import Foundation | ||
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| /// `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 { | ||
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| public static let png = FormatIndicatedCacheSerializer(imageFormat: .PNG) | ||
| public static let jpeg = FormatIndicatedCacheSerializer(imageFormat: .JPEG) | ||
| public static let gif = FormatIndicatedCacheSerializer(imageFormat: .GIF) | ||
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| /// The indicated image format. | ||
| private let imageFormat: ImageFormat | ||
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| public func data(with image: Image, original: Data?) -> Data? { | ||
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| 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 | ||
| } | ||
| } | ||
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| // generate data with indicated image format | ||
| if let data = imageData(withFormat: imageFormat) { | ||
| return data | ||
| } | ||
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| let originalFormat = original?.kf.imageFormat ?? .unknown | ||
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| // generate data with original image's format | ||
| if originalFormat != imageFormat, let data = imageData(withFormat: originalFormat) { | ||
| return data | ||
| } | ||
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| return original ?? image.kf.normalized.kf.pngRepresentation() | ||
| } | ||
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| /// 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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