53 lines
1.8 KiB
Swift
53 lines
1.8 KiB
Swift
import SDWebImage
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import ExpoModulesCore
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class BlurhashLoader: NSObject, SDImageLoader {
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// MARK: - SDImageLoader
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func canRequestImage(for url: URL?) -> Bool {
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return url?.scheme == "blurhash"
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}
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func requestImage(
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with url: URL?,
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options: SDWebImageOptions = [],
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context: [SDWebImageContextOption: Any]?,
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progress progressBlock: SDImageLoaderProgressBlock?,
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completed completedBlock: SDImageLoaderCompletedBlock? = nil
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) -> SDWebImageOperation? {
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guard let url = url else {
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let error = makeNSError(description: "URL provided to BlurhashLoader is missing")
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completedBlock?(nil, nil, error, false)
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return nil
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}
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guard let source = context?[ImageView.contextSourceKey] as? ImageSource else {
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let error = makeNSError(description: "Image source was not provided to the context")
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completedBlock?(nil, nil, error, false)
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return nil
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}
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// The URI looks like this: blurhash:/WgF}G?az0fs.x[jat7xFRjNHt6s.4;oe-:RkVtkCi^Nbo|xZRjWB
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// Which means that the `pathComponents[0]` is `/` and we need to skip it to get the hash.
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let blurhash = url.pathComponents[1]
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let size = CGSize(width: source.width, height: source.height)
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DispatchQueue.global(qos: .userInitiated).async {
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if let image = image(fromBlurhash: blurhash, size: size) {
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DispatchQueue.main.async {
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completedBlock?(UIImage(cgImage: image), nil, nil, true)
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}
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} else {
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let error = makeNSError(description: "Unable to generate an image from the given blurhash")
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completedBlock?(nil, nil, error, false)
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}
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}
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return nil
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}
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func shouldBlockFailedURL(with url: URL, error: Error) -> Bool {
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// If the algorithm failed to generate an image from the url,
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// it's not possible that next time it will work :)
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return true
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}
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}
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