[cc] Move root layer pointer to LayerTreeImpl

cc/layer_tree_host_impl.h

 // Copyright 2011 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 CC_LAYER_TREE_HOST_IMPL_H_
 #define CC_LAYER_TREE_HOST_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "cc/animation_events.h"
 #include "cc/cc_export.h"
 #include "cc/input_handler.h"
 #include "cc/layer_sorter.h"
+#include "cc/layer_tree_impl.h"
 #include "cc/render_pass.h"
 #include "cc/render_pass_sink.h"
 #include "cc/renderer.h"
 #include "cc/tile_manager.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/rect.h"
 #include <public/WebCompositorOutputSurfaceClient.h>
 
 namespace cc {
 
 class CompletionEvent;
 class DebugRectHistory;
 class FrameRateCounter;
-class HeadsUpDisplayLayerImpl;
 class LayerImpl;
 class LayerTreeHostImplTimeSourceAdapter;
 class PageScaleAnimation;
 class RenderPassDrawQuad;
 class ResourceProvider;
 struct RendererCapabilities;
 struct RenderingStats;
 
 // LayerTreeHost->Proxy callback interface.
 class LayerTreeHostImplClient {
@@ skipping 67 matching lines @@
     float m_deviceScaleFactor;
 
     gfx::Vector2dF m_zoomedViewportOffset;
     gfx::SizeF m_layoutViewportSize;
 };
 
 // LayerTreeHostImpl owns the LayerImpl tree as well as associated rendering state
 class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
                                     public RendererClient,
                                     public TileManagerClient,
+                                    public LayerTreeImplClient,
                                     public NON_EXPORTED_BASE(WebKit::WebCompositorOutputSurfaceClient) {
     typedef std::vector<LayerImpl*> LayerList;
 
 public:
     static scoped_ptr<LayerTreeHostImpl> create(const LayerTreeSettings&, LayerTreeHostImplClient*, Proxy*);
     virtual ~LayerTreeHostImpl();
 
     // InputHandlerClient implementation
     virtual InputHandlerClient::ScrollStatus scrollBegin(gfx::Point, InputHandlerClient::ScrollInputType) OVERRIDE;
     virtual bool scrollBy(const gfx::Point&, const gfx::Vector2d&) OVERRIDE;
@@ skipping 46 matching lines @@
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
     virtual bool hasImplThread() const OVERRIDE;
 
     // TileManagerClient implementation.
     virtual void ScheduleManageTiles() OVERRIDE;
     virtual void ScheduleRedraw() OVERRIDE;
 
     // WebCompositorOutputSurfaceClient implementation.
     virtual void onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds) OVERRIDE;
 
+    // LayerTreeImplClient implementation.
+    virtual void OnCanDrawStateChangedForTree(LayerTreeImpl*) OVERRIDE;
+
     // Implementation
     bool canDraw();
     GraphicsContext* context() const;
 
     std::string layerTreeAsText() const;
 
     void finishAllRendering();
     int sourceAnimationFrameNumber() const;
 
     bool initializeRenderer(scoped_ptr<GraphicsContext>);
     bool isContextLost();
     TileManager* tileManager() { return m_tileManager.get(); }
     Renderer* renderer() { return m_renderer.get(); }
     const RendererCapabilities& rendererCapabilities() const;
 
     bool swapBuffers();
 
     void readback(void* pixels, const gfx::Rect&);
 
+    LayerTreeImpl* activeTree() { return m_activeTree.get(); }
+
+    // TODO(nduca): Remove these in favor of LayerTreeImpl.
     void setRootLayer(scoped_ptr<LayerImpl>);
-    LayerImpl* rootLayer() { return m_rootLayerImpl.get(); }
-
-    void setHudLayer(HeadsUpDisplayLayerImpl* layerImpl) { m_hudLayerImpl = layerImpl; }
-    HeadsUpDisplayLayerImpl* hudLayer() { return m_hudLayerImpl; }
+    LayerImpl* rootLayer() const { return m_activeTree->RootLayer(); }
 
     // Release ownership of the current layer tree and replace it with an empty
     // tree. Returns the root layer of the detached tree.
     scoped_ptr<LayerImpl> detachLayerTree();
 
-    LayerImpl* rootScrollLayer() const { return m_rootScrollLayerImpl; }
+    LayerImpl* rootScrollLayer() const { return m_activeTree->root_scroll_layer(); }
 
     bool visible() const { return m_visible; }
     void setVisible(bool);
 
-    int sourceFrameNumber() const { return m_sourceFrameNumber; }
-    void setSourceFrameNumber(int frameNumber) { m_sourceFrameNumber = frameNumber; }
-
     bool contentsTexturesPurged() const { return m_contentsTexturesPurged; }
     void setContentsTexturesPurged();
     void resetContentsTexturesPurged();
     size_t memoryAllocationLimitBytes() const { return m_managedMemoryPolicy.bytesLimitWhenVisible; }
 
     void setViewportSize(const gfx::Size& layoutViewportSize, const gfx::Size& deviceViewportSize);
     const gfx::Size& layoutViewportSize() const { return m_layoutViewportSize; }
 
     float deviceScaleFactor() const { return m_deviceScaleFactor; }
     void setDeviceScaleFactor(float);
@@ skipping 69 matching lines @@
     void calculateRenderSurfaceLayerList(LayerList&);
 
     // Virtual for testing.
     virtual void animateLayers(base::TimeTicks monotonicTime, base::Time wallClockTime);
 
     // Virtual for testing.
     virtual base::TimeDelta lowFrequencyAnimationInterval() const;
 
     LayerTreeHostImplClient* m_client;
     Proxy* m_proxy;
-    int m_sourceFrameNumber;
 
 private:
     void computeDoubleTapZoomDeltas(ScrollAndScaleSet* scrollInfo);
     void computePinchZoomDeltas(ScrollAndScaleSet* scrollInfo);
     void makeScrollAndScaleSet(ScrollAndScaleSet* scrollInfo, gfx::Vector2d scrollOffset, float pageScale);
 
     void setPageScaleDelta(float);
     void updateMaxScrollOffset();
     void trackDamageForAllSurfaces(LayerImpl* rootDrawLayer, const LayerList& renderSurfaceLayerList);
 
@@ skipping 11 matching lines @@
     void clearCurrentlyScrollingLayer();
 
     void animateScrollbarsRecursive(LayerImpl*, base::TimeTicks monotonicTime);
 
     void dumpRenderSurfaces(std::string*, int indent, const LayerImpl*) const;
 
     scoped_ptr<GraphicsContext> m_context;
     scoped_ptr<ResourceProvider> m_resourceProvider;
     scoped_ptr<Renderer> m_renderer;
     scoped_ptr<TileManager> m_tileManager;
-    scoped_ptr<LayerImpl> m_rootLayerImpl;
-    LayerImpl* m_rootScrollLayerImpl;
-    LayerImpl* m_currentlyScrollingLayerImpl;
-    HeadsUpDisplayLayerImpl* m_hudLayerImpl;
-    int m_scrollingLayerIdFromPreviousTree;
+
+    scoped_ptr<LayerTreeImpl> m_activeTree;
+
     bool m_scrollDeltaIsInViewportSpace;
     LayerTreeSettings m_settings;
     LayerTreeDebugState m_debugState;
     gfx::Size m_layoutViewportSize;
     gfx::Size m_deviceViewportSize;
     float m_deviceScaleFactor;
     bool m_visible;
     bool m_contentsTexturesPurged;
     ManagedMemoryPolicy m_managedMemoryPolicy;
 
@@ skipping 25 matching lines @@
     size_t m_numMainThreadScrolls;
 
     size_t m_cumulativeNumLayersDrawn;
 
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_IMPL_H_