Optimize MTHKView.swift

Sources/IO/MTHKView.swift

@@ -46,9 +46,6 @@ public class MTHKView: MTKView {
     }
 
     private var currentSampleBuffer: CMSampleBuffer?
-
-    private let colorSpace: CGColorSpace = CGColorSpaceCreateDeviceRGB()
-
     private lazy var commandQueue: (any MTLCommandQueue)? = {
         return device?.makeCommandQueue()
     }()
@@ -90,10 +87,12 @@ public class MTHKView: MTKView {
     /// Prepares the receiver for service after it has been loaded from an Interface Builder archive, or nib file.
     override open func awakeFromNib() {
         super.awakeFromNib()
+
         framebufferOnly = false
         enableSetNeedsDisplay = true
+
         if let device {
-            context = CIContext(mtlDevice: device)
+            context = CIContext(mtlDevice: device, options: [.cacheIntermediates: false, .name: "MTHKView"])
         }
     }
 
@@ -138,14 +137,22 @@ public class MTHKView: MTKView {
         default:
             break
         }
-        let bounds = CGRect(origin: .zero, size: drawableSize)
-        var scaledImage: CIImage = displayImage
 
-        scaledImage = scaledImage
+        var scaledImage = displayImage
             .transformed(by: CGAffineTransform(translationX: translationX, y: translationY))
             .transformed(by: CGAffineTransform(scaleX: scaleX, y: scaleY))
 
-        context.render(scaledImage, to: currentDrawable.texture, commandBuffer: commandBuffer, bounds: bounds, colorSpace: colorSpace)
+        let destination = CIRenderDestination(
+            width: Int(drawableSize.width),
+            height: Int(drawableSize.height),
+            pixelFormat: colorPixelFormat,
+            commandBuffer: commandBuffer,
+            mtlTextureProvider: { () -> (any MTLTexture) in
+                return currentDrawable.texture
+            })
+
+        _ = try? context.startTask(toRender: scaledImage, to: destination)
+
         commandBuffer.present(currentDrawable)
         commandBuffer.commit()
     }