Make rendering use PaintingNodes for increased efficiency.

sky/engine/core/painting/Canvas.h

 // 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.
 
 #ifndef SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 #define SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 
 #include "sky/engine/bindings/exception_state.h"
 #include "sky/engine/core/painting/CanvasPath.h"
 #include "sky/engine/core/painting/Drawable.h"
 #include "sky/engine/core/painting/Offset.h"
 #include "sky/engine/core/painting/Paint.h"
+#include "sky/engine/core/painting/PaintingNode.h"
 #include "sky/engine/core/painting/Picture.h"
 #include "sky/engine/core/painting/PictureRecorder.h"
 #include "sky/engine/core/painting/Point.h"
 #include "sky/engine/core/painting/RRect.h"
 #include "sky/engine/core/painting/Rect.h"
 #include "sky/engine/core/painting/Size.h"
 #include "sky/engine/platform/graphics/DisplayList.h"
 #include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/tonic/float32_list.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 
 namespace blink {
 class CanvasImage;
 
 class Canvas : public RefCounted<Canvas>, public DartWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<Canvas> create(SkCanvas* skCanvas) {
         ASSERT(skCanvas);
         return adoptRef(new Canvas(skCanvas));
     }
 
     static PassRefPtr<Canvas> create(PictureRecorder* recorder,
-                                     Size& bounds,
+                                     Rect& bounds,
                                      ExceptionState& es) {
         ASSERT(recorder);
         if (recorder->isRecording()) {
             es.ThrowTypeError(
                 "You must call PictureRecorder.endRecording() before reusing a"
                 " PictureRecorder to create a new Canvas object.");
             // TODO(iansf): We should return a nullptr here, I think, but doing
             //              so will require modifying the dart template code to
             //              to correctly handle constructors that throw
             //              exceptions.  For now, just let it return a dart
             //              object that may cause a crash later on -- if the
             //              dart code catches the error, it will leak a canvas
             //              but it won't crash.
         }
-        PassRefPtr<Canvas> canvas = create(
-          recorder->beginRecording(bounds.sk_size.width(), bounds.sk_size.height()));
+        PassRefPtr<Canvas> canvas = create(recorder->beginRecording(bounds));
         recorder->set_canvas(canvas.get());
         return canvas;
     }
 
     ~Canvas() override;
 
     void save();
     void saveLayer(const Rect& bounds, const Paint* paint = nullptr);
     void restore();
 
@@ skipping 11 matching lines @@
     void drawPaint(const Paint* paint);
     void drawRect(const Rect& rect, const Paint* paint);
     void drawRRect(const RRect* rrect, const Paint* paint);
     void drawOval(const Rect& rect, const Paint* paint);
     void drawCircle(const Point& c, float radius, const Paint* paint);
     void drawPath(const CanvasPath* path, const Paint* paint);
     void drawImage(const CanvasImage* image, const Point& p, const Paint* paint);
     void drawImageRect(const CanvasImage* image, Rect& src, Rect& dst, Paint* paint);
     void drawPicture(Picture* picture);
     void drawDrawable(Drawable* drawable);
+    void drawPaintingNode(PaintingNode* paintingNode, const Point& p);
 
     SkCanvas* skCanvas() { return m_canvas; }
     void clearSkCanvas() { m_canvas = nullptr; }
     bool isRecording() const { return !!m_canvas; }
 
 protected:
     explicit Canvas(SkCanvas* skCanvas);
 
 private:
     // The SkCanvas is supplied by a call to SkPictureRecorder::beginRecording,
     // which does not transfer ownership.  For this reason, we hold a raw
     // pointer and manually set the SkCanvas to null in clearSkCanvas.
     SkCanvas* m_canvas;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_PAINTING_CANVAS_H_