Implement ColorFilter in widgets/basic.dart

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 '../framework/debug/utils.dart';
@@ skipping 464 matching lines @@
       if (a == 0)
         return;
 
       if (a == 255) {
         child.paint(canvas);
         return;
       }
 
       Paint paint = new Paint()
         ..color = new Color.fromARGB(a, 0, 0, 0)
-        ..setTransferMode(sky.TransferMode.srcOverMode);
+        ..setTransferMode(sky.TransferMode.srcOver);
       canvas.saveLayer(null, paint);
       child.paint(canvas);
       canvas.restore();
+    }
+  }
+}
+
+class RenderColorFilter extends RenderProxyBox {
+  RenderColorFilter({ RenderBox child, Color color, sky.TransferMode transferMode })
+    : this._color = color, _transferMode = transferMode, super(child) {

[Hixie, 2015/06/17 23:59:12]

you don't need the this.

+  }
+
+  Color _color;
+  Color get color => _color;
+  void set color (Color value) {
+    assert(value != null);
+    if (_color == value)
+      return;
+    _color = value;
+    markNeedsPaint();
+  }
+
+  sky.TransferMode _transferMode;
+  sky.TransferMode get transferMode => _transferMode;
+  void set transferMode (sky.TransferMode value) {
+    assert(value != null);
+    if (_transferMode == value)
+      return;
+    _transferMode = value;
+    markNeedsPaint();
+  }
+
+  void paint(RenderObjectDisplayList canvas) {
+    if (child != null) {
+      Paint paint = new Paint()
+        ..setColorFilter(new sky.ColorFilter.mode(_color, _transferMode));
+      canvas.saveLayer(null, paint);
+      child.paint(canvas);
+      canvas.restore();
     }
   }
 }
 
 class RenderClipRect extends RenderProxyBox {
   RenderClipRect({ RenderBox child }) : super(child);
 
   void paint(RenderObjectDisplayList canvas) {
     if (child != null) {
       canvas.save();
@@ skipping 544 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }