Make rendering use PaintingNodes for increased efficiency.

sky/engine/core/painting/PaintingNode.cpp

+// 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.
+
+#include "sky/engine/core/painting/PaintingNode.h"
+#include "sky/engine/core/painting/Picture.h"
+
+namespace blink {
+
+class PaintingNodeDrawable : public SkDrawable {
+public:
+    static PassRefPtr<PaintingNodeDrawable> create(PassRefPtr<SkDrawable> skDrawable = nullptr);
+
+    ~PaintingNodeDrawable() override;
+
+    SkRect onGetBounds() override;
+    void onDraw(SkCanvas* canvas) override;
+    SkPicture* onNewPictureSnapshot() override;
+    void set_drawable(PassRefPtr<SkDrawable> drawable) { m_drawable = drawable; }
+
+private:
+    PaintingNodeDrawable();
+    explicit PaintingNodeDrawable(PassRefPtr<SkDrawable> skDrawable);
+    RefPtr<SkDrawable> m_drawable;
+};
+
+// static
+PassRefPtr<PaintingNodeDrawable> PaintingNodeDrawable::create(PassRefPtr<SkDrawable> skDrawable)
+{
+    return adoptRef(new PaintingNodeDrawable(skDrawable));
+}
+
+PaintingNodeDrawable::~PaintingNodeDrawable() {}
+
+
+PaintingNodeDrawable::PaintingNodeDrawable(PassRefPtr<SkDrawable> skDrawable)
+    : m_drawable(skDrawable)
+{
+}
+
+SkPicture* PaintingNodeDrawable::onNewPictureSnapshot()
+{
+    if (!m_drawable)
+        return nullptr;
+    return m_drawable->newPictureSnapshot();
+}
+
+SkRect PaintingNodeDrawable::onGetBounds()
+{
+    if (!m_drawable)
+        return SkRect::MakeEmpty();
+    return m_drawable->getBounds();
+}
+
+void PaintingNodeDrawable::onDraw(SkCanvas* canvas)
+{
+    if (!m_drawable)
+        return;
+    return m_drawable->draw(canvas);
+}
+
+
+
+
+PassRefPtr<PaintingNode> PaintingNode::create()
+{
+    return adoptRef(new PaintingNode());
+}
+
+PaintingNode::PaintingNode()
+    : m_paintingNodeDrawable(PaintingNodeDrawable::create())
+{
+}
+
+void PaintingNode::setBackingDrawable(PassRefPtr<Drawable> drawable)
+{
+    m_paintingNodeDrawable->set_drawable(drawable->toSkia());
+}
+
+SkDrawable* PaintingNode::toSkia()
+{
+    return m_paintingNodeDrawable.get();
+}
+
+PassRefPtr<Picture> PaintingNode::newPictureSnapshot()
+{
+    ASSERT(m_paintingNodeDrawable);
+    return Picture::create(
+        adoptRef(m_paintingNodeDrawable->newPictureSnapshot()));
+}
+
+PaintingNode::~PaintingNode()
+{
+}
+
+} // namespace blink