1 files changed, 354 insertions, 1 deletions
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 638cbb2..297f619 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -1,3 +1,356 @@
-// Copyright 2012 The Chromium Authors. All rights reserved.
+// 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 CCLayerTreeHostImpl_h
+#define CCLayerTreeHostImpl_h
+
+#include "base/basictypes.h"
+#include "base/time.h"
+#include "CCAnimationEvents.h"
+#include "CCInputHandler.h"
+#include "CCLayerSorter.h"
+#include "CCRenderPass.h"
+#include "CCRenderPassSink.h"
+#include "CCRenderer.h"
+#include "SkColor.h"
+#include <public/WebCompositorOutputSurfaceClient.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/RefPtr.h>
+
+namespace cc {
+
+class CCCompletionEvent;
+class CCDebugRectHistory;
+class CCFrameRateCounter;
+class CCHeadsUpDisplayLayerImpl;
+class CCLayerImpl;
+class CCLayerTreeHostImplTimeSourceAdapter;
+class CCPageScaleAnimation;
+class CCRenderPassDrawQuad;
+class CCResourceProvider;
+struct RendererCapabilities;
+struct CCRenderingStats;
+
+// CCLayerTreeHost->CCProxy callback interface.
+class CCLayerTreeHostImplClient {
+public:
+    virtual void didLoseContextOnImplThread() = 0;
+    virtual void onSwapBuffersCompleteOnImplThread() = 0;
+    virtual void onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds) = 0;
+    virtual void onCanDrawStateChanged(bool canDraw) = 0;
+    virtual void setNeedsRedrawOnImplThread() = 0;
+    virtual void setNeedsCommitOnImplThread() = 0;
+    virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<CCAnimationEventsVector>, double wallClockTime) = 0;
+    virtual void releaseContentsTexturesOnImplThread() = 0;
+};
+
+// CCPinchZoomViewport models the bounds and offset of the viewport that is used during a pinch-zoom operation.
+// It tracks the layout-space dimensions of the viewport before any applied scale, and then tracks the layout-space
+// coordinates of the viewport respecting the pinch settings.
+class CCPinchZoomViewport {
+public:
+    CCPinchZoomViewport();
+
+    float totalPageScaleFactor() const;
+
+    void setPageScaleFactor(float factor) { m_pageScaleFactor = factor; }
+    float pageScaleFactor() const { return m_pageScaleFactor; }
+
+    void setPageScaleDelta(float delta);
+    float pageScaleDelta() const  { return m_pageScaleDelta; }
+
+    float minPageScaleFactor() const { return m_minPageScaleFactor; }
+    float maxPageScaleFactor() const { return m_maxPageScaleFactor; }
+
+    void setSentPageScaleDelta(float delta) { m_sentPageScaleDelta = delta; }
+    float sentPageScaleDelta() const { return m_sentPageScaleDelta; }
+
+    // Returns true if the passed parameters were different from those previously
+    // cached.
+    bool setPageScaleFactorAndLimits(float pageScaleFactor,
+                                     float minPageScaleFactor,
+                                     float maxPageScaleFactor);
+
+    // Returns the bounds and offset of the scaled and translated viewport to use for pinch-zoom.
+    FloatRect bounds() const;
+    const FloatPoint& scrollDelta() const { return m_pinchViewportScrollDelta; }
+
+    void setLayoutViewportSize(const FloatSize& size) { m_layoutViewportSize = size; }
+
+    // Apply the scroll offset in layout space to the offset of the pinch-zoom viewport. The viewport cannot be
+    // scrolled outside of the layout viewport bounds. Returns the component of the scroll that is un-applied due to
+    // this constraint.
+    FloatSize applyScroll(FloatSize&);
+
+    WebKit::WebTransformationMatrix implTransform() const;
+
+private:
+    float m_pageScaleFactor;
+    float m_pageScaleDelta;
+    float m_sentPageScaleDelta;
+    float m_maxPageScaleFactor;
+    float m_minPageScaleFactor;
+
+    FloatPoint m_pinchViewportScrollDelta;
+    FloatSize m_layoutViewportSize;
+};
+
+// CCLayerTreeHostImpl owns the CCLayerImpl tree as well as associated rendering state
+class CCLayerTreeHostImpl : public CCInputHandlerClient,
+                            public CCRendererClient,
+                            public WebKit::WebCompositorOutputSurfaceClient {
+    typedef std::vector<CCLayerImpl*> CCLayerList;
+
+public:
+    static scoped_ptr<CCLayerTreeHostImpl> create(const CCLayerTreeSettings&, CCLayerTreeHostImplClient*);
+    virtual ~CCLayerTreeHostImpl();
+
+    // CCInputHandlerClient implementation
+    virtual CCInputHandlerClient::ScrollStatus scrollBegin(const IntPoint&, CCInputHandlerClient::ScrollInputType) OVERRIDE;
+    virtual void scrollBy(const IntPoint&, const IntSize&) OVERRIDE;
+    virtual void scrollEnd() OVERRIDE;
+    virtual void pinchGestureBegin() OVERRIDE;
+    virtual void pinchGestureUpdate(float, const IntPoint&) OVERRIDE;
+    virtual void pinchGestureEnd() OVERRIDE;
+    virtual void startPageScaleAnimation(const IntSize& targetPosition, bool anchorPoint, float pageScale, double startTime, double duration) OVERRIDE;
+    virtual void scheduleAnimation() OVERRIDE;
+
+    struct FrameData : public CCRenderPassSink {
+        FrameData();
+        ~FrameData();
+
+        Vector<IntRect> occludingScreenSpaceRects;
+        CCRenderPassList renderPasses;
+        CCRenderPassIdHashMap renderPassesById;
+        CCLayerList* renderSurfaceLayerList;
+        CCLayerList willDrawLayers;
+
+        // CCRenderPassSink implementation.
+        virtual void appendRenderPass(scoped_ptr<CCRenderPass>) OVERRIDE;
+    };
+
+    // Virtual for testing.
+    virtual void beginCommit();
+    virtual void commitComplete();
+    virtual void animate(double monotonicTime, double wallClockTime);
+
+    // Returns false if problems occured preparing the frame, and we should try
+    // to avoid displaying the frame. If prepareToDraw is called,
+    // didDrawAllLayers must also be called, regardless of whether drawLayers is
+    // called between the two.
+    virtual bool prepareToDraw(FrameData&);
+    virtual void drawLayers(const FrameData&);
+    // Must be called if and only if prepareToDraw was called.
+    void didDrawAllLayers(const FrameData&);
+
+    // CCRendererClient implementation
+    virtual const IntSize& deviceViewportSize() const OVERRIDE;
+    virtual const CCLayerTreeSettings& settings() const OVERRIDE;
+    virtual void didLoseContext() OVERRIDE;
+    virtual void onSwapBuffersComplete() OVERRIDE;
+    virtual void setFullRootLayerDamage() OVERRIDE;
+    virtual void releaseContentsTextures() OVERRIDE;
+    virtual void setMemoryAllocationLimitBytes(size_t) OVERRIDE;
+
+    // WebCompositorOutputSurfaceClient implementation.
+    virtual void onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds) OVERRIDE;
+
+    // Implementation
+    bool canDraw();
+    CCGraphicsContext* context() const;
+
+    std::string layerTreeAsText() const;
+
+    void finishAllRendering();
+    int sourceAnimationFrameNumber() const;
+
+    bool initializeRenderer(scoped_ptr<CCGraphicsContext>);
+    bool isContextLost();
+    CCRenderer* renderer() { return m_renderer.get(); }
+    const RendererCapabilities& rendererCapabilities() const;
+
+    bool swapBuffers();
+
+    void readback(void* pixels, const IntRect&);
+
+    void setRootLayer(scoped_ptr<CCLayerImpl>);
+    CCLayerImpl* rootLayer() { return m_rootLayerImpl.get(); }
+
+    void setHudLayer(CCHeadsUpDisplayLayerImpl* layerImpl) { m_hudLayerImpl = layerImpl; }
+    CCHeadsUpDisplayLayerImpl* hudLayer() { return m_hudLayerImpl; }
+
+    // Release ownership of the current layer tree and replace it with an empty
+    // tree. Returns the root layer of the detached tree.
+    scoped_ptr<CCLayerImpl> detachLayerTree();
+
+    CCLayerImpl* rootScrollLayer() const { return m_rootScrollLayerImpl; }
+
+    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_memoryAllocationLimitBytes; }
+
+    void setViewportSize(const IntSize& layoutViewportSize, const IntSize& deviceViewportSize);
+    const IntSize& layoutViewportSize() const { return m_layoutViewportSize; }
+
+    float deviceScaleFactor() const { return m_deviceScaleFactor; }
+    void setDeviceScaleFactor(float);
+
+    float pageScaleFactor() const;
+    void setPageScaleFactorAndLimits(float pageScaleFactor, float minPageScaleFactor, float maxPageScaleFactor);
+
+    scoped_ptr<CCScrollAndScaleSet> processScrollDeltas();
+    WebKit::WebTransformationMatrix implTransform() const;
+
+    void startPageScaleAnimation(const IntSize& tragetPosition, bool useAnchor, float scale, double durationSec);
+
+    SkColor backgroundColor() const { return m_backgroundColor; }
+    void setBackgroundColor(SkColor color) { m_backgroundColor = color; }
+
+    bool hasTransparentBackground() const { return m_hasTransparentBackground; }
+    void setHasTransparentBackground(bool transparent) { m_hasTransparentBackground = transparent; }
+
+    bool needsAnimateLayers() const { return m_needsAnimateLayers; }
+    void setNeedsAnimateLayers() { m_needsAnimateLayers = true; }
+
+    void setNeedsRedraw();
+
+    void renderingStats(CCRenderingStats*) const;
+
+    void updateRootScrollLayerImplTransform();
+
+    CCFrameRateCounter* fpsCounter() const { return m_fpsCounter.get(); }
+    CCDebugRectHistory* debugRectHistory() const { return m_debugRectHistory.get(); }
+    CCResourceProvider* resourceProvider() const { return m_resourceProvider.get(); }
+
+    class CullRenderPassesWithCachedTextures {
+    public:
+        bool shouldRemoveRenderPass(const CCRenderPassDrawQuad&, const FrameData&) const;
+
+        // Iterates from the root first, in order to remove the surfaces closest
+        // to the root with cached textures, and all surfaces that draw into
+        // them.
+        size_t renderPassListBegin(const CCRenderPassList& list) const { return list.size() - 1; }
+        size_t renderPassListEnd(const CCRenderPassList&) const { return 0 - 1; }
+        size_t renderPassListNext(size_t it) const { return it - 1; }
+
+        CullRenderPassesWithCachedTextures(CCRenderer& renderer) : m_renderer(renderer) { }
+    private:
+        CCRenderer& m_renderer;
+    };
+
+    class CullRenderPassesWithNoQuads {
+    public:
+        bool shouldRemoveRenderPass(const CCRenderPassDrawQuad&, const FrameData&) const;
+
+        // Iterates in draw order, so that when a surface is removed, and its
+        // target becomes empty, then its target can be removed also.
+        size_t renderPassListBegin(const CCRenderPassList&) const { return 0; }
+        size_t renderPassListEnd(const CCRenderPassList& list) const { return list.size(); }
+        size_t renderPassListNext(size_t it) const { return it + 1; }
+    };
+
+    template<typename RenderPassCuller>
+    static void removeRenderPasses(RenderPassCuller, FrameData&);
+
+protected:
+    CCLayerTreeHostImpl(const CCLayerTreeSettings&, CCLayerTreeHostImplClient*);
+
+    void animatePageScale(double monotonicTime);
+    void animateScrollbars(double monotonicTime);
+
+    // Exposed for testing.
+    void calculateRenderSurfaceLayerList(CCLayerList&);
+
+    // Virtual for testing.
+    virtual void animateLayers(double monotonicTime, double wallClockTime);
+
+    // Virtual for testing.
+    virtual base::TimeDelta lowFrequencyAnimationInterval() const;
+
+    CCLayerTreeHostImplClient* m_client;
+    int m_sourceFrameNumber;
+
+private:
+    void computeDoubleTapZoomDeltas(CCScrollAndScaleSet* scrollInfo);
+    void computePinchZoomDeltas(CCScrollAndScaleSet* scrollInfo);
+    void makeScrollAndScaleSet(CCScrollAndScaleSet* scrollInfo, const IntSize& scrollOffset, float pageScale);
+
+    void setPageScaleDelta(float);
+    void updateMaxScrollPosition();
+    void trackDamageForAllSurfaces(CCLayerImpl* rootDrawLayer, const CCLayerList& renderSurfaceLayerList);
+
+    // Returns false if the frame should not be displayed. This function should
+    // only be called from prepareToDraw, as didDrawAllLayers must be called
+    // if this helper function is called.
+    bool calculateRenderPasses(FrameData&);
+    void animateLayersRecursive(CCLayerImpl*, double monotonicTime, double wallClockTime, CCAnimationEventsVector*, bool& didAnimate, bool& needsAnimateLayers);
+    void setBackgroundTickingEnabled(bool);
+    IntSize contentSize() const;
+
+    void sendDidLoseContextRecursive(CCLayerImpl*);
+    void clearRenderSurfaces();
+    bool ensureRenderSurfaceLayerList();
+    void clearCurrentlyScrollingLayer();
+
+    void animateScrollbarsRecursive(CCLayerImpl*, double monotonicTime);
+
+    void dumpRenderSurfaces(std::string*, int indent, const CCLayerImpl*) const;
+
+    scoped_ptr<CCGraphicsContext> m_context;
+    OwnPtr<CCResourceProvider> m_resourceProvider;
+    OwnPtr<CCRenderer> m_renderer;
+    scoped_ptr<CCLayerImpl> m_rootLayerImpl;
+    CCLayerImpl* m_rootScrollLayerImpl;
+    CCLayerImpl* m_currentlyScrollingLayerImpl;
+    CCHeadsUpDisplayLayerImpl* m_hudLayerImpl;
+    int m_scrollingLayerIdFromPreviousTree;
+    bool m_scrollDeltaIsInScreenSpace;
+    CCLayerTreeSettings m_settings;
+    IntSize m_layoutViewportSize;
+    IntSize m_deviceViewportSize;
+    float m_deviceScaleFactor;
+    bool m_visible;
+    bool m_contentsTexturesPurged;
+    size_t m_memoryAllocationLimitBytes;
+
+    SkColor m_backgroundColor;
+    bool m_hasTransparentBackground;
+
+    // If this is true, it is necessary to traverse the layer tree ticking the animators.
+    bool m_needsAnimateLayers;
+    bool m_pinchGestureActive;
+    IntPoint m_previousPinchAnchor;
+
+    OwnPtr<CCPageScaleAnimation> m_pageScaleAnimation;
+
+    // This is used for ticking animations slowly when hidden.
+    OwnPtr<CCLayerTreeHostImplTimeSourceAdapter> m_timeSourceClientAdapter;
+
+    CCLayerSorter m_layerSorter;
+
+    // List of visible layers for the most recently prepared frame. Used for
+    // rendering and input event hit testing.
+    CCLayerList m_renderSurfaceLayerList;
+
+    CCPinchZoomViewport m_pinchZoomViewport;
+
+    OwnPtr<CCFrameRateCounter> m_fpsCounter;
+    OwnPtr<CCDebugRectHistory> m_debugRectHistory;
+
+    size_t m_numImplThreadScrolls;
+    size_t m_numMainThreadScrolls;
+
+    DISALLOW_COPY_AND_ASSIGN(CCLayerTreeHostImpl);
+};
+
+};
+
+#endif