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80 lines
3.2 KiB
80 lines
3.2 KiB
//
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// ImageDataProcessor.swift
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// Kingfisher
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//
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// Created by Wei Wang on 2018/10/11.
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//
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// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import Foundation
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private let sharedProcessingQueue: CallbackQueue =
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.dispatch(DispatchQueue(label: "com.onevcat.Kingfisher.ImageDownloader.Process"))
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// Handles image processing work on an own process queue.
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class ImageDataProcessor {
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let data: Data
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let callbacks: [SessionDataTask.TaskCallback]
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let queue: CallbackQueue
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// Note: We have an optimization choice there, to reduce queue dispatch by checking callback
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// queue settings in each option...
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let onImageProcessed = Delegate<(Result<Image, KingfisherError>, SessionDataTask.TaskCallback), Void>()
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init(data: Data, callbacks: [SessionDataTask.TaskCallback], processingQueue: CallbackQueue?) {
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self.data = data
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self.callbacks = callbacks
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self.queue = processingQueue ?? sharedProcessingQueue
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}
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func process() {
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queue.execute(doProcess)
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}
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private func doProcess() {
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var processedImages = [String: Image]()
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for callback in callbacks {
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let processor = callback.options.processor
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var image = processedImages[processor.identifier]
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if image == nil {
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image = processor.process(item: .data(data), options: callback.options)
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processedImages[processor.identifier] = image
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}
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let result: Result<Image, KingfisherError>
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if let image = image {
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var finalImage = image
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if let imageModifier = callback.options.imageModifier {
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finalImage = imageModifier.modify(image)
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}
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if callback.options.backgroundDecode {
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finalImage = finalImage.kf.decoded
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}
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result = .success(finalImage)
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} else {
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let error = KingfisherError.processorError(
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reason: .processingFailed(processor: processor, item: .data(data)))
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result = .failure(error)
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}
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onImageProcessed.call((result, callback))
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}
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}
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}
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