Camera and media editor improvements

submodules/TelegramUI/Components/MediaEditor/Sources/ImageTextureSource.swift

@@ -0,0 +1,52 @@
+import Foundation
+import AVFoundation
+import Metal
+import MetalKit
+
+final class ImageTextureSource: TextureSource {
+    weak var output: TextureConsumer?
+    
+    var textureLoader: MTKTextureLoader?
+    var texture: MTLTexture?
+        
+    init(image: UIImage, renderTarget: RenderTarget) {
+        guard let device = renderTarget.mtlDevice, let cgImage = image.cgImage else {
+            return
+        }
+        let textureLoader = MTKTextureLoader(device: device)
+        self.textureLoader = textureLoader
+        
+        self.texture = try? textureLoader.newTexture(cgImage: cgImage, options: nil)
+    }
+    
+    func start() {
+        
+    }
+    
+    func pause() {
+        
+    }
+    
+    func connect(to consumer: TextureConsumer) {
+        self.output = consumer
+        
+        if let texture = self.texture {
+            self.output?.consumeTexture(texture, rotation: .rotate0Degrees)
+        }
+    }
+}
+
+func pixelBufferToMTLTexture(pixelBuffer:CVPixelBuffer, textureCache: CVMetalTextureCache) -> MTLTexture?
+{
+    let width = CVPixelBufferGetWidth(pixelBuffer)
+    let height = CVPixelBufferGetHeight(pixelBuffer)
+
+    let format: MTLPixelFormat = .r8Unorm
+    var textureRef : CVMetalTexture?
+    let status = CVMetalTextureCacheCreateTextureFromImage(nil, textureCache, pixelBuffer, nil, format, width, height, 0, &textureRef)
+    if status == kCVReturnSuccess {
+        return CVMetalTextureGetTexture(textureRef!)
+    }
+
+    return nil
+}