more stubs for encoder preview

CaptureSample/Views/CapturePreview.swift

@@ -11,23 +11,51 @@ struct CapturePreview: NSViewRepresentable {
 
     // A layer that renders the video contents.
     private let contentLayer = CALayer()
+    private let encodedContentLayer = CALayer()
 
     init() {
         contentLayer.contentsGravity = .resizeAspect
+        //contentLayer.contentsGravity = .topLeft
+        //encodedContentLayer.contentsGravity = .topRight
     }
 
     func makeNSView(context: Context) -> CaptureVideoPreview {
         CaptureVideoPreview(layer: contentLayer)
+        //CaptureSplitViewPreview(firstLayer: contentLayer, secondLayer: encodedContentLayer)
     }
 
     // Called by ScreenRecorder as it receives new video frames.
     func updateFrame(_ frame: CapturedFrame) {
         contentLayer.contents = frame.surface
+        encodedContentLayer.contents = frame.encodedSurface
     }
 
     // The view isn't updatable. Updates to the layer's content are done in outputFrame(frame:).
     func updateNSView(_ nsView: CaptureVideoPreview, context: Context) {}
 
+    class CaptureSplitViewPreview: NSSplitView {
+        var firstView: NSView
+        var secondView: NSView
+
+        init(firstLayer: CALayer, secondLayer: CALayer) {
+            self.firstView = CaptureVideoPreview(layer: firstLayer)
+            self.secondView = CaptureVideoPreview(layer: secondLayer)
+            super.init(frame: .zero)
+            self.isVertical = true
+            self.addSubview(self.firstView)
+            self.addSubview(self.secondView)
+            firstLayer.contentsScale = 3.0
+            secondLayer.contentsScale = 3.0
+            //firstLayer.contentsRect = self.visibleRect
+            //secondLayer.contentsRect = self.visibleRect
+            self.wantsLayer = true
+        }
+
+        required init?(coder: NSCoder) {
+            fatalError("init(coder:) has not been implemented")
+        }
+    }
+
     class CaptureVideoPreview: NSView {
         // Create the preview with the video layer as the backing layer.
         init(layer: CALayer) {