Animation rendering

submodules/TelegramUI/Components/LottieAnimationCache/Sources/LottieAnimationCache.swift

@@ -0,0 +1,23 @@
+import Foundation
+import UIKit
+import AnimationCache
+import Display
+import RLottieBinding
+import GZip
+
+public func cacheLottieAnimation(data: Data, width: Int, height: Int, writer: AnimationCacheItemWriter) {
+    let decompressedData = TGGUnzipData(data, 512 * 1024) ?? data
+    guard let animation = LottieInstance(data: decompressedData, fitzModifier: .none, colorReplacements: nil, cacheKey: "") else {
+        writer.finish()
+        return
+    }
+    let size = CGSize(width: width, height: height)
+    let context = DrawingContext(size: size, scale: 1.0, opaque: false, clear: true)
+    let frameDuration = 1.0 / Double(animation.frameRate)
+    for i in 0 ..< animation.frameCount {
+        animation.renderFrame(with: i, into: context.bytes.assumingMemoryBound(to: UInt8.self), width: Int32(context.scaledSize.width), height: Int32(context.scaledSize.height), bytesPerRow: Int32(context.bytesPerRow))
+        writer.add(bytes: context.bytes, length: context.length, width: Int(context.scaledSize.width), height: Int(context.scaledSize.height), bytesPerRow: Int(context.bytesPerRow), duration: frameDuration)
+    }
+    
+    writer.finish()
+}