forked from shadowfacts/Tusker
parent
9b33059089
commit
d6a847bfcc
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@ -22,6 +22,7 @@ class ImageCache {
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#endif
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private let cache: ImageDataCache
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private let desiredPixelSize: CGSize?
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private var groups = MultiThreadDictionary<URL, RequestGroup>(name: "ImageCache request groups")
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@ -30,28 +31,47 @@ class ImageCache {
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init(name: String, memoryExpiry: CacheExpiry, diskExpiry: CacheExpiry? = nil, desiredSize: CGSize? = nil) {
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// todo: might not always want to use UIScreen.main for this, e.g. Catalyst?
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let pixelSize = desiredSize?.applying(.init(scaleX: UIScreen.main.scale, y: UIScreen.main.scale))
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self.desiredPixelSize = pixelSize
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self.cache = ImageDataCache(name: name, memoryExpiry: memoryExpiry, diskExpiry: diskExpiry, storeOriginalDataInMemory: diskExpiry == nil, desiredPixelSize: pixelSize)
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}
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func get(_ url: URL, loadOriginal: Bool = false, completion: ((Data?, UIImage?) -> Void)?) -> Request? {
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let key = url.absoluteString
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if !ImageCache.disableCaching,
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let entry = try? cache.get(key, loadOriginal: loadOriginal) {
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if let completion = completion {
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backgroundQueue.async {
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completion(entry.data, entry.image)
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let wrappedCompletion: ((Data?, UIImage?) -> Void)?
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if let completion = completion {
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wrappedCompletion = { (data, image) in
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if #available(iOS 15.0, *) {
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if !loadOriginal,
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let size = self.desiredPixelSize {
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image?.prepareThumbnail(of: size, completionHandler: {
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completion(data, $0)
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})
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} else {
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image?.prepareForDisplay {
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completion(data, $0)
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}
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}
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} else {
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self.backgroundQueue.async {
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completion(data, image)
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}
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}
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}
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} else {
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wrappedCompletion = nil
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}
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if !ImageCache.disableCaching,
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let entry = try? cache.get(key, loadOriginal: loadOriginal) {
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wrappedCompletion?(entry.data, entry.image)
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return nil
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} else {
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if let group = groups[url] {
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if let completion = completion {
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return group.addCallback(completion)
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}
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return nil
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return group.addCallback(wrappedCompletion)
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} else {
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let group = createGroup(url: url)
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let request = group.addCallback(completion)
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let request = group.addCallback(wrappedCompletion)
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group.run()
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return request
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}
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@ -122,21 +142,15 @@ class ImageCache {
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task!.resume()
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}
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private func updatePriority() {
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task?.priority = max(1.0, URLSessionTask.defaultPriority + 0.1 * Float(requests.filter { !$0.cancelled }.count))
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}
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func addCallback(_ completion: ((Data?, UIImage?) -> Void)?) -> Request {
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let request = Request(callback: completion)
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requests.append(request)
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updatePriority()
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return request
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}
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func cancelWithoutCallback() {
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if let request = requests.first(where: { $0.callback == nil && !$0.cancelled }) {
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request.cancel()
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updatePriority()
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}
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}
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@ -145,8 +159,6 @@ class ImageCache {
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if remaining <= 0 {
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task?.cancel()
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complete(with: nil)
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} else {
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updatePriority()
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}
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}
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