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submodules/TelegramUI/Sources/SoftwareVideoThumbnailLayer.swift

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+import Foundation
+import UIKit
+import TelegramCore
+import SyncCore
+import Postbox
+import SwiftSignalKit
+import Display
+import PhotoResources
+
+private final class SoftwareVideoThumbnailLayerNullAction: NSObject, CAAction {
+    @objc func run(forKey event: String, object anObject: Any, arguments dict: [AnyHashable : Any]?) {
+    }
+}
+
+final class SoftwareVideoThumbnailLayer: CALayer {
+    var disposable = MetaDisposable()
+    
+    var ready: (() -> Void)? {
+        didSet {
+            if self.contents != nil {
+                self.ready?()
+            }
+        }
+    }
+    
+    init(account: Account, fileReference: FileMediaReference) {
+        super.init()
+        
+        self.backgroundColor = UIColor.clear.cgColor
+        self.contentsGravity = .resizeAspectFill
+        self.masksToBounds = true
+        
+        if let dimensions = fileReference.media.dimensions {
+            self.disposable.set((mediaGridMessageVideo(postbox: account.postbox, videoReference: fileReference)).start(next: { [weak self] transform in
+                var boundingSize = dimensions.cgSize.aspectFilled(CGSize(width: 93.0, height: 93.0))
+                let imageSize = boundingSize
+                boundingSize.width = min(200.0, boundingSize.width)
+                
+                if let image = transform(TransformImageArguments(corners: ImageCorners(), imageSize: imageSize, boundingSize: boundingSize, intrinsicInsets: UIEdgeInsets(), resizeMode: .fill(.clear)))?.generateImage() {
+                    Queue.mainQueue().async {
+                        if let strongSelf = self {
+                            strongSelf.contents = image.cgImage
+                            strongSelf.ready?()
+                        }
+                    }
+                }
+            }))
+        }
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    deinit {
+        self.disposable.dispose()
+    }
+    
+    override func action(forKey event: String) -> CAAction? {
+        return SoftwareVideoThumbnailLayerNullAction()
+    }
+}