Implement ClipRRect

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 571 matching lines @@
   void paint(RenderCanvas canvas) {
     if (child != null) {
       canvas.save();
       canvas.clipRect(new Rect.fromSize(size));
       child.paint(canvas);
       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);
+  }
+
+  double _xRadius;
+  double get xRadius => _xRadius;
+  void set xRadius (double value) {
+    assert(value != null);
+    if (_xRadius == value)
+      return;
+    _xRadius = value;
+    markNeedsPaint();
+  }
+
+  double _yRadius;
+  double get yRadius => _yRadius;
+  void set yRadius (double value) {
+    assert(value != null);
+    if (_yRadius == value)
+      return;
+    _yRadius = value;
+    markNeedsPaint();
+  }
+
+  void paint(RenderCanvas canvas) {
+    if (child != null) {
+      Rect rect = new Rect.fromSize(size);
+      canvas.saveLayer(rect, new Paint());
+      sky.RRect rrect = new sky.RRect()..setRectXY(rect, xRadius, yRadius);
+      canvas.clipRRect(rrect);
+      child.paint(canvas);
+      canvas.restore();
+    }
+  }
+}
+
 class RenderClipOval extends RenderProxyBox {
   RenderClipOval({ RenderBox child }) : super(child);
 
   void paint(RenderCanvas canvas) {
     if (child != null) {
       Rect rect = new Rect.fromSize(size);
       canvas.saveLayer(rect, new Paint());
       Path path = new Path();
       path.addOval(rect);
       canvas.clipPath(path);
@@ skipping 586 matching lines @@
 
   void defaultPaint(RenderCanvas canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }