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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CCLayerTreeHostImpl_h
#define CCLayerTreeHostImpl_h
#include "SkColor.h"
#include "cc/CCAnimationEvents.h"
#include "cc/CCInputHandler.h"
#include "cc/CCLayerSorter.h"
#include "cc/CCRenderPass.h"
#include "cc/CCRenderer.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class CCActiveGestureAnimation;
class CCCompletionEvent;
class CCDebugRectHistory;
class CCFontAtlas;
class CCFrameRateCounter;
class CCHeadsUpDisplay;
class CCLayerImpl;
class CCLayerTreeHostImplTimeSourceAdapter;
class CCPageScaleAnimation;
class CCRenderPassDrawQuad;
class CCResourceProvider;
class LayerRendererChromium;
struct LayerRendererCapabilities;
// CCLayerTreeHost->CCProxy callback interface.
class CCLayerTreeHostImplClient {
public:
virtual void didLoseContextOnImplThread() = 0;
virtual void onSwapBuffersCompleteOnImplThread() = 0;
virtual void setNeedsRedrawOnImplThread() = 0;
virtual void setNeedsCommitOnImplThread() = 0;
virtual void postAnimationEventsToMainThreadOnImplThread(PassOwnPtr<CCAnimationEventsVector>, double wallClockTime) = 0;
};
// CCLayerTreeHostImpl owns the CCLayerImpl tree as well as associated rendering state
class CCLayerTreeHostImpl : public CCInputHandlerClient, CCRendererClient {
WTF_MAKE_NONCOPYABLE(CCLayerTreeHostImpl);
typedef Vector<CCLayerImpl*> CCLayerList;
public:
static PassOwnPtr<CCLayerTreeHostImpl> create(const CCLayerTreeSettings&, CCLayerTreeHostImplClient*);
virtual ~CCLayerTreeHostImpl();
// CCInputHandlerClient implementation
virtual CCInputHandlerClient::ScrollStatus scrollBegin(const IntPoint&, CCInputHandlerClient::ScrollInputType);
virtual void scrollBy(const IntSize&);
virtual void scrollEnd();
virtual void pinchGestureBegin();
virtual void pinchGestureUpdate(float, const IntPoint&);
virtual void pinchGestureEnd();
virtual void startPageScaleAnimation(const IntSize& targetPosition, bool anchorPoint, float pageScale, double startTime, double duration);
virtual CCActiveGestureAnimation* activeGestureAnimation() { return m_activeGestureAnimation.get(); }
// To clear an active animation, pass nullptr.
virtual void setActiveGestureAnimation(PassOwnPtr<CCActiveGestureAnimation>);
virtual void scheduleAnimation();
struct FrameData {
Vector<IntRect> occludingScreenSpaceRects;
CCRenderPassList renderPasses;
CCRenderPassIdHashMap renderPassesById;
CCLayerList* renderSurfaceLayerList;
CCLayerList willDrawLayers;
};
// 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 { return m_deviceViewportSize; }
virtual const CCLayerTreeSettings& settings() const OVERRIDE { return m_settings; }
virtual void didLoseContext() OVERRIDE;
virtual void onSwapBuffersComplete() OVERRIDE;
virtual void setFullRootLayerDamage() OVERRIDE;
virtual void releaseContentsTextures() OVERRIDE;
virtual void setMemoryAllocationLimitBytes(size_t) OVERRIDE;
// Implementation
bool canDraw();
CCGraphicsContext* context() const;
String layerTreeAsText() const;
void setFontAtlas(PassOwnPtr<CCFontAtlas>);
void finishAllRendering();
int sourceAnimationFrameNumber() const { return m_sourceAnimationFrameNumber; }
bool initializeLayerRenderer(PassOwnPtr<CCGraphicsContext>, TextureUploaderOption);
bool isContextLost();
CCRenderer* layerRenderer() { return m_layerRenderer.get(); }
const LayerRendererCapabilities& layerRendererCapabilities() const;
bool swapBuffers();
void readback(void* pixels, const IntRect&);
void setRootLayer(PassOwnPtr<CCLayerImpl>);
CCLayerImpl* rootLayer() { return m_rootLayerImpl.get(); }
// Release ownership of the current layer tree and replace it with an empty
// tree. Returns the root layer of the detached tree.
PassOwnPtr<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 contentsTexturesWerePurgedSinceLastCommit() const { return m_contentsTexturesWerePurgedSinceLastCommit; }
size_t memoryAllocationLimitBytes() const { return m_memoryAllocationLimitBytes; }
const IntSize& viewportSize() const { return m_viewportSize; }
void setViewportSize(const IntSize&);
float deviceScaleFactor() const { return m_deviceScaleFactor; }
void setDeviceScaleFactor(float);
float pageScale() const { return m_pageScale; }
void setPageScaleFactorAndLimits(float pageScale, float minPageScale, float maxPageScale);
PassOwnPtr<CCScrollAndScaleSet> processScrollDeltas();
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();
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 animateGestures(double monotonicTime);
// Exposed for testing.
void calculateRenderSurfaceLayerList(CCLayerList&);
// Virtual for testing.
virtual void animateLayers(double monotonicTime, double wallClockTime);
// Virtual for testing. Measured in seconds.
virtual double lowFrequencyAnimationInterval() const;
CCLayerTreeHostImplClient* m_client;
int m_sourceFrameNumber;
int m_sourceAnimationFrameNumber;
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 dumpRenderSurfaces(TextStream&, int indent, const CCLayerImpl*) const;
OwnPtr<CCGraphicsContext> m_context;
OwnPtr<CCResourceProvider> m_resourceProvider;
OwnPtr<CCRenderer> m_layerRenderer;
OwnPtr<CCLayerImpl> m_rootLayerImpl;
CCLayerImpl* m_rootScrollLayerImpl;
CCLayerImpl* m_currentlyScrollingLayerImpl;
int m_scrollingLayerIdFromPreviousTree;
CCLayerTreeSettings m_settings;
IntSize m_viewportSize;
IntSize m_deviceViewportSize;
float m_deviceScaleFactor;
bool m_visible;
bool m_contentsTexturesWerePurgedSinceLastCommit;
size_t m_memoryAllocationLimitBytes;
OwnPtr<CCHeadsUpDisplay> m_headsUpDisplay;
float m_pageScale;
float m_pageScaleDelta;
float m_sentPageScaleDelta;
float m_minPageScale, m_maxPageScale;
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;
OwnPtr<CCActiveGestureAnimation> m_activeGestureAnimation;
// This is used for ticking animations slowly when hidden.
OwnPtr<CCLayerTreeHostImplTimeSourceAdapter> m_timeSourceClientAdapter;
CCLayerSorter m_layerSorter;
FloatRect m_rootScissorRect;
// List of visible layers for the most recently prepared frame. Used for
// rendering and input event hit testing.
CCLayerList m_renderSurfaceLayerList;
OwnPtr<CCFrameRateCounter> m_fpsCounter;
OwnPtr<CCDebugRectHistory> m_debugRectHistory;
};
};
#endif
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