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submodules/TelegramUI/Sources/PrepareSecretThumbnailData.swift

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+import Foundation
+import UIKit
+import Postbox
+import Display
+
+func prepareSecretThumbnailData(_ data: MediaResourceData) -> (CGSize, Data)? {
+    if data.complete, let image = UIImage(contentsOfFile: data.path) {
+        if image.size.width < 100 && image.size.height < 100 {
+            if let resultData = try? Data(contentsOf: URL(fileURLWithPath: data.path)) {
+                return (image.size, resultData)
+            }
+        }
+        let scaledSize = image.size.fitted(CGSize(width: 90.0, height: 90.0))
+        if let scaledImage = generateScaledImage(image: image, size: scaledSize, scale: 1.0), let scaledData = scaledImage.jpegData(compressionQuality: 0.4) {
+            return (scaledSize, scaledData)
+        }
+    }
+    return nil
+}