Make rendering use PaintingNodes for increased efficiency.

sky/sdk/lib/rendering/box.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import 'package:vector_math/vector_math.dart';
 
 import '../base/debug.dart';
@@ skipping 412 matching lines @@
     assert(RenderObject.debugDoingLayout);
     assert((sizedByParent && debugDoingThisResize) ||
            (!sizedByParent && debugDoingThisLayout));
     if (value is _DebugSize) {
       assert(value._canBeUsedByParent);
       assert(value._owner.parent == this);
     }
     _size = inDebugBuild ? new _DebugSize(value, this, debugCanParentUseSize) : value;
   }
 
+  Rect get paintBounds => Point.origin & size;
+
   String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}size: ${size}\n';
 }
 
 class RenderProxyBox extends RenderBox with RenderObjectWithChildMixin<RenderBox> {
 
   // ProxyBox assumes the child will be at 0,0 and will have the same size
 
   RenderProxyBox([RenderBox child = null]) {
     this.child = child;
   }
@@ skipping 39 matching lines @@
 
   void hitTestChildren(HitTestResult result, { Point position }) {
     if (child != null)
       child.hitTest(result, position: position);
     else
       super.hitTestChildren(result, position: position);
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null)
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
   }
 
 }
 
 class RenderConstrainedBox extends RenderProxyBox {
   RenderConstrainedBox({
     RenderBox child,
     BoxConstraints additionalConstraints
   }) : super(child), _additionalConstraints = additionalConstraints {
     assert(additionalConstraints != null);
@@ skipping 152 matching lines @@
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       int a = (_opacity * 255).round();
 
       if (a == 0)
         return;
 
       if (a == 255) {
-        child.paint(canvas, offset);
+        canvas.paintChild(child, offset.toPoint());
         return;
       }
 
       Paint paint = new Paint()
         ..color = new Color.fromARGB(a, 0, 0, 0)
         ..setTransferMode(sky.TransferMode.srcOver);
       canvas.saveLayer(null, paint);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderColorFilter extends RenderProxyBox {
   RenderColorFilter({ RenderBox child, Color color, sky.TransferMode transferMode })
     : _color = color, _transferMode = transferMode, super(child) {
   }
 
@@ skipping 15 matching lines @@
       return;
     _transferMode = value;
     markNeedsPaint();
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Paint paint = new Paint()
         ..setColorFilter(new sky.ColorFilter.mode(_color, _transferMode));
       canvas.saveLayer(null, paint);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipRect extends RenderProxyBox {
   RenderClipRect({ RenderBox child }) : super(child);
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       canvas.save();
       canvas.clipRect(offset & size);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipRRect extends RenderProxyBox {
   RenderClipRRect({ RenderBox child, double xRadius, double yRadius })
     : _xRadius = xRadius, _yRadius = yRadius, super(child) {
     assert(_xRadius != null);
     assert(_yRadius != null);
@@ skipping 18 matching lines @@
     _yRadius = value;
     markNeedsPaint();
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Rect rect = offset & size;
       canvas.saveLayer(rect, new Paint());
       sky.RRect rrect = new sky.RRect()..setRectXY(rect, xRadius, yRadius);
       canvas.clipRRect(rrect);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipOval extends RenderProxyBox {
   RenderClipOval({ RenderBox child }) : super(child);
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Rect rect = offset & size;
       canvas.saveLayer(rect, new Paint());
       Path path = new Path();
       path.addOval(rect);
       canvas.clipPath(path);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 abstract class RenderShiftedBox extends RenderBox with RenderObjectWithChildMixin<RenderBox> {
 
   // Abstract class for one-child-layout render boxes
 
   RenderShiftedBox(RenderBox child) {
@@ skipping 348 matching lines @@
     assert(size.width != null);
     assert(size.height != null);
     _painter.paint(canvas, offset & size);
     super.paint(canvas, offset);
   }
 
   String debugDescribeSettings(String prefix) => '${super.debugDescribeSettings(prefix)}${prefix}decoration:\n${_painter.decoration.toString(prefix + "  ")}\n';
 }
 
 class RenderTransform extends RenderProxyBox {
+  bool get createNewDisplayList => true;
+
   RenderTransform({
     Matrix4 transform,
     RenderBox child
   }) : super(child) {
     assert(transform != null);
     this.transform = transform;
   }
 
   Matrix4 _transform;
 
@@ skipping 123 matching lines @@
 class ViewConstraints {
   const ViewConstraints({
     this.size: Size.zero,
     this.orientation
   });
   final Size size;
   final int orientation;
 }
 
 class RenderView extends RenderObject with RenderObjectWithChildMixin<RenderBox> {
+  bool get createNewDisplayList => true;
 
   RenderView({
     RenderBox child,
     this.timeForRotation: const Duration(microseconds: 83333)
   }) {
     this.child = child;
   }
 
   Size _size = Size.zero;
   Size get size => _size;
@@ skipping 46 matching lines @@
     return true;
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null)
       canvas.paintChild(child, offset.toPoint());
   }
 
   void paintFrame() {
     sky.tracing.begin('RenderView.paintFrame');
-    RenderObject.debugDoingPaint = true;
     try {
       sky.PictureRecorder recorder = new sky.PictureRecorder();
-      PaintingCanvas canvas = new PaintingCanvas(recorder, _size);
-      paint(canvas, Offset.zero);
+      PaintingCanvas canvas = new PaintingCanvas(recorder, paintBounds);
+      canvas.drawPaintingNode(paintingNode, Point.origin);
       sky.view.picture = recorder.endRecording();
     } finally {
-      RenderObject.debugDoingPaint = false;
       sky.tracing.end('RenderView.paintFrame');
     }
   }
 
+  Rect get paintBounds => Point.origin & size;
 }
 
 // HELPER METHODS FOR RENDERBOX CONTAINERS
 abstract class RenderBoxContainerDefaultsMixin<ChildType extends RenderBox, ParentDataType extends ContainerParentDataMixin<ChildType>> implements ContainerRenderObjectMixin<ChildType, ParentDataType> {
 
   // This class, by convention, doesn't override any members of the superclass.
   // It only provides helper functions that subclasses can call.
 
   double defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) {
     assert(!needsLayout);
@@ skipping 44 matching lines @@
 
   void defaultPaint(PaintingCanvas canvas, Offset offset) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position + offset);
       child = child.parentData.nextSibling;
     }
   }
 }