cc/trees/layer_tree_host_impl.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TREES_LAYER_TREE_HOST_IMPL_H_
   6 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
   7
   8 #include <list>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/containers/hash_tables.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/time/time.h"
  17 #include "cc/animation/animation_events.h"
  18 #include "cc/animation/animation_registrar.h"
  19 #include "cc/animation/scrollbar_animation_controller.h"
  20 #include "cc/base/cc_export.h"
  21 #include "cc/debug/micro_benchmark_controller_impl.h"
  22 #include "cc/input/input_handler.h"
  23 #include "cc/input/layer_scroll_offset_delegate.h"
  24 #include "cc/input/top_controls_manager_client.h"
  25 #include "cc/layers/layer_lists.h"
  26 #include "cc/layers/render_pass_sink.h"
  27 #include "cc/output/begin_frame_args.h"
  28 #include "cc/output/managed_memory_policy.h"
  29 #include "cc/output/output_surface_client.h"
  30 #include "cc/output/renderer.h"
  31 #include "cc/quads/render_pass.h"
  32 #include "cc/resources/resource_provider.h"
  33 #include "cc/resources/tile_manager.h"
  34 #include "cc/scheduler/draw_result.h"
  35 #include "skia/ext/refptr.h"
  36 #include "third_party/skia/include/core/SkColor.h"
  37 #include "ui/gfx/rect.h"
  38
  39 namespace cc {
  40
  41 class CompletionEvent;
  42 class CompositorFrameMetadata;
  43 class DebugRectHistory;
  44 class EvictionTilePriorityQueue;
  45 class FrameRateCounter;
  46 class LayerImpl;
  47 class LayerTreeHostImplTimeSourceAdapter;
  48 class LayerTreeImpl;
  49 class MemoryHistory;
  50 class PageScaleAnimation;
  51 class PaintTimeCounter;
  52 class PictureLayerImpl;
  53 class RasterTilePriorityQueue;
  54 class RasterWorkerPool;
  55 class RenderPassDrawQuad;
  56 class RenderingStatsInstrumentation;
  57 class ResourcePool;
  58 class ScrollbarLayerImplBase;
  59 class TextureMailboxDeleter;
  60 class TopControlsManager;
  61 class UIResourceBitmap;
  62 class UIResourceRequest;
  63 struct RendererCapabilitiesImpl;
  64
  65 // LayerTreeHost->Proxy callback interface.
  66 class LayerTreeHostImplClient {
  67  public:
  68   virtual void UpdateRendererCapabilitiesOnImplThread() = 0;
  69   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
  70   virtual void CommitVSyncParameters(base::TimeTicks timebase,
  71                                      base::TimeDelta interval) = 0;
  72   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) = 0;
  73   virtual void SetMaxSwapsPendingOnImplThread(int max) = 0;
  74   virtual void DidSwapBuffersOnImplThread() = 0;
  75   virtual void DidSwapBuffersCompleteOnImplThread() = 0;
  76   virtual void BeginFrame(const BeginFrameArgs& args) = 0;
  77   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
  78   virtual void NotifyReadyToActivate() = 0;
  79   // Please call these 3 functions through
  80   // LayerTreeHostImpl's SetNeedsRedraw(), SetNeedsRedrawRect() and
  81   // SetNeedsAnimate().
  82   virtual void SetNeedsRedrawOnImplThread() = 0;
  83   virtual void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) = 0;
  84   virtual void SetNeedsAnimateOnImplThread() = 0;
  85   virtual void DidInitializeVisibleTileOnImplThread() = 0;
  86   virtual void SetNeedsCommitOnImplThread() = 0;
  87   virtual void SetNeedsManageTilesOnImplThread() = 0;
  88   virtual void PostAnimationEventsToMainThreadOnImplThread(
  89       scoped_ptr<AnimationEventsVector> events) = 0;
  90   // Returns true if resources were deleted by this call.
  91   virtual bool ReduceContentsTextureMemoryOnImplThread(
  92       size_t limit_bytes,
  93       int priority_cutoff) = 0;
  94   virtual bool IsInsideDraw() = 0;
  95   virtual void RenewTreePriority() = 0;
  96   virtual void PostDelayedScrollbarFadeOnImplThread(
  97       const base::Closure& start_fade,
  98       base::TimeDelta delay) = 0;
  99   virtual void DidActivateSyncTree() = 0;
 100   virtual void DidManageTiles() = 0;
 101
 102  protected:
 103   virtual ~LayerTreeHostImplClient() {}
 104 };
 105
 106 // LayerTreeHostImpl owns the LayerImpl trees as well as associated rendering
 107 // state.
 108 class CC_EXPORT LayerTreeHostImpl
 109     : public InputHandler,
 110       public RendererClient,
 111       public TileManagerClient,
 112       public OutputSurfaceClient,
 113       public TopControlsManagerClient,
 114       public ScrollbarAnimationControllerClient,
 115       public base::SupportsWeakPtr<LayerTreeHostImpl> {
 116  public:
 117   static scoped_ptr<LayerTreeHostImpl> Create(
 118       const LayerTreeSettings& settings,
 119       LayerTreeHostImplClient* client,
 120       Proxy* proxy,
 121       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 122       SharedBitmapManager* manager,
 123       int id);
 124   virtual ~LayerTreeHostImpl();
 125
 126   // InputHandler implementation
 127   virtual void BindToClient(InputHandlerClient* client) OVERRIDE;
 128   virtual InputHandler::ScrollStatus ScrollBegin(
 129       const gfx::Point& viewport_point,
 130       InputHandler::ScrollInputType type) OVERRIDE;
 131   virtual InputHandler::ScrollStatus ScrollAnimated(
 132       const gfx::Point& viewport_point,
 133       const gfx::Vector2dF& scroll_delta) OVERRIDE;
 134   virtual bool ScrollBy(const gfx::Point& viewport_point,
 135                         const gfx::Vector2dF& scroll_delta) OVERRIDE;
 136   virtual bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
 137                                       ScrollDirection direction) OVERRIDE;
 138   virtual void SetRootLayerScrollOffsetDelegate(
 139       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) OVERRIDE;
 140   virtual void OnRootLayerDelegatedScrollOffsetChanged() OVERRIDE;
 141   virtual void ScrollEnd() OVERRIDE;
 142   virtual InputHandler::ScrollStatus FlingScrollBegin() OVERRIDE;
 143   virtual void MouseMoveAt(const gfx::Point& viewport_point) OVERRIDE;
 144   virtual void PinchGestureBegin() OVERRIDE;
 145   virtual void PinchGestureUpdate(float magnify_delta,
 146                                   const gfx::Point& anchor) OVERRIDE;
 147   virtual void PinchGestureEnd() OVERRIDE;
 148   virtual void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 149                                        bool anchor_point,
 150                                        float page_scale,
 151                                        base::TimeDelta duration) OVERRIDE;
 152   virtual void SetNeedsAnimate() OVERRIDE;
 153   virtual bool IsCurrentlyScrollingLayerAt(
 154       const gfx::Point& viewport_point,
 155       InputHandler::ScrollInputType type) OVERRIDE;
 156   virtual bool HaveTouchEventHandlersAt(
 157       const gfx::Point& viewport_port) OVERRIDE;
 158   virtual scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
 159       ui::LatencyInfo* latency) OVERRIDE;
 160
 161   // TopControlsManagerClient implementation.
 162   virtual void DidChangeTopControlsPosition() OVERRIDE;
 163   virtual bool HaveRootScrollLayer() const OVERRIDE;
 164
 165   struct CC_EXPORT FrameData : public RenderPassSink {
 166     FrameData();
 167     virtual ~FrameData();
 168     void AsValueInto(base::debug::TracedValue* value) const;
 169
 170     std::vector<gfx::Rect> occluding_screen_space_rects;
 171     std::vector<gfx::Rect> non_occluding_screen_space_rects;
 172     RenderPassList render_passes;
 173     RenderPassIdHashMap render_passes_by_id;
 174     const LayerImplList* render_surface_layer_list;
 175     LayerImplList will_draw_layers;
 176     bool contains_incomplete_tile;
 177     bool has_no_damage;
 178
 179     // RenderPassSink implementation.
 180     virtual void AppendRenderPass(scoped_ptr<RenderPass> render_pass) OVERRIDE;
 181   };
 182
 183   virtual void BeginMainFrameAborted(bool did_handle);
 184   virtual void BeginCommit();
 185   virtual void CommitComplete();
 186   virtual void Animate(base::TimeTicks monotonic_time);
 187   virtual void UpdateAnimationState(bool start_ready_animations);
 188   void ActivateAnimations();
 189   void MainThreadHasStoppedFlinging();
 190   void UpdateBackgroundAnimateTicking(bool should_background_tick);
 191   void DidAnimateScrollOffset();
 192   void SetViewportDamage(const gfx::Rect& damage_rect);
 193
 194   virtual void ManageTiles();
 195
 196   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
 197   // should try to avoid displaying the frame. If PrepareToDraw is called,
 198   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
 199   // called between the two.
 200   virtual DrawResult PrepareToDraw(FrameData* frame);
 201   virtual void DrawLayers(FrameData* frame, base::TimeTicks frame_begin_time);
 202   // Must be called if and only if PrepareToDraw was called.
 203   void DidDrawAllLayers(const FrameData& frame);
 204
 205   const LayerTreeSettings& settings() const { return settings_; }
 206
 207   // Evict all textures by enforcing a memory policy with an allocation of 0.
 208   void EvictTexturesForTesting();
 209
 210   // When blocking, this prevents client_->NotifyReadyToActivate() from being
 211   // called. When disabled, it calls client_->NotifyReadyToActivate()
 212   // immediately if any notifications had been blocked while blocking.
 213   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 214
 215   // This allows us to inject DidInitializeVisibleTile events for testing.
 216   void DidInitializeVisibleTileForTesting();
 217
 218   // Resets all of the trees to an empty state.
 219   void ResetTreesForTesting();
 220
 221   DrawMode GetDrawMode() const;
 222
 223   // Viewport size in draw space: this size is in physical pixels and is used
 224   // for draw properties, tilings, quads and render passes.
 225   gfx::Size DrawViewportSize() const;
 226
 227   // Viewport rect in view space used for tiling prioritization.
 228   const gfx::Rect ViewportRectForTilePriority() const;
 229
 230   // RendererClient implementation.
 231   virtual void SetFullRootLayerDamage() OVERRIDE;
 232
 233   // TileManagerClient implementation.
 234   virtual const std::vector<PictureLayerImpl*>& GetPictureLayers()
 235       const OVERRIDE;
 236   virtual void NotifyReadyToActivate() OVERRIDE;
 237   virtual void NotifyTileStateChanged(const Tile* tile) OVERRIDE;
 238   virtual void BuildRasterQueue(RasterTilePriorityQueue* queue,
 239                                 TreePriority tree_priority) OVERRIDE;
 240   virtual void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
 241                                   TreePriority tree_priority) OVERRIDE;
 242
 243   // ScrollbarAnimationControllerClient implementation.
 244   virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
 245                                         base::TimeDelta delay) OVERRIDE;
 246   virtual void SetNeedsScrollbarAnimationFrame() OVERRIDE;
 247
 248   // OutputSurfaceClient implementation.
 249   virtual void DeferredInitialize() OVERRIDE;
 250   virtual void ReleaseGL() OVERRIDE;
 251   virtual void CommitVSyncParameters(base::TimeTicks timebase,
 252                                      base::TimeDelta interval) OVERRIDE;
 253   virtual void SetNeedsRedrawRect(const gfx::Rect& rect) OVERRIDE;
 254   virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE;
 255
 256   virtual void SetExternalDrawConstraints(
 257       const gfx::Transform& transform,
 258       const gfx::Rect& viewport,
 259       const gfx::Rect& clip,
 260       const gfx::Rect& viewport_rect_for_tile_priority,
 261       const gfx::Transform& transform_for_tile_priority,
 262       bool resourceless_software_draw) OVERRIDE;
 263   virtual void DidLoseOutputSurface() OVERRIDE;
 264   virtual void DidSwapBuffers() OVERRIDE;
 265   virtual void DidSwapBuffersComplete() OVERRIDE;
 266   virtual void ReclaimResources(const CompositorFrameAck* ack) OVERRIDE;
 267   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
 268   virtual void SetTreeActivationCallback(const base::Closure& callback)
 269       OVERRIDE;
 270
 271   // Called from LayerTreeImpl.
 272   void OnCanDrawStateChangedForTree();
 273
 274   // Implementation.
 275   int id() const { return id_; }
 276   bool CanDraw() const;
 277   OutputSurface* output_surface() const { return output_surface_.get(); }
 278
 279   std::string LayerTreeAsJson() const;
 280
 281   void FinishAllRendering();
 282   int SourceAnimationFrameNumber() const;
 283
 284   virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
 285   bool IsContextLost();
 286   TileManager* tile_manager() { return tile_manager_.get(); }
 287   void SetUseGpuRasterization(bool use_gpu);
 288   bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
 289   bool create_low_res_tiling() const {
 290     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
 291   }
 292   ResourcePool* resource_pool() { return resource_pool_.get(); }
 293   Renderer* renderer() { return renderer_.get(); }
 294   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
 295
 296   virtual bool SwapBuffers(const FrameData& frame);
 297   void SetNeedsBeginFrame(bool enable);
 298   virtual void WillBeginImplFrame(const BeginFrameArgs& args);
 299   void DidModifyTilePriorities();
 300
 301   LayerTreeImpl* active_tree() { return active_tree_.get(); }
 302   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
 303   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
 304   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
 305   LayerTreeImpl* recycle_tree() { return recycle_tree_.get(); }
 306   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
 307   // Returns the tree LTH synchronizes with.
 308   LayerTreeImpl* sync_tree() {
 309     return pending_tree_ ? pending_tree_.get() : active_tree_.get();
 310   }
 311   virtual void CreatePendingTree();
 312   virtual void UpdateVisibleTiles();
 313   virtual void ActivateSyncTree();
 314
 315   // Shortcuts to layers on the active tree.
 316   LayerImpl* RootLayer() const;
 317   LayerImpl* InnerViewportScrollLayer() const;
 318   LayerImpl* OuterViewportScrollLayer() const;
 319   LayerImpl* CurrentlyScrollingLayer() const;
 320
 321   int scroll_layer_id_when_mouse_over_scrollbar() const {
 322     return scroll_layer_id_when_mouse_over_scrollbar_;
 323   }
 324   bool scroll_affects_scroll_handler() const {
 325     return scroll_affects_scroll_handler_;
 326   }
 327   void QueueSwapPromiseForMainThreadScrollUpdate(
 328       scoped_ptr<SwapPromise> swap_promise);
 329
 330   bool IsCurrentlyScrolling() const;
 331
 332   virtual void SetVisible(bool visible);
 333   bool visible() const { return visible_; }
 334
 335   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
 336   void SetNeedsRedraw();
 337
 338   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
 339
 340   size_t memory_allocation_limit_bytes() const;
 341   int memory_allocation_priority_cutoff() const;
 342
 343   void SetViewportSize(const gfx::Size& device_viewport_size);
 344   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 345
 346   void SetTopControlsLayoutHeight(float top_controls_layout_height);
 347   float top_controls_layout_height() const {
 348     return top_controls_layout_height_;
 349   }
 350
 351   void SetOverhangUIResource(UIResourceId overhang_ui_resource_id,
 352                              const gfx::Size& overhang_ui_resource_size);
 353
 354   void SetDeviceScaleFactor(float device_scale_factor);
 355   float device_scale_factor() const { return device_scale_factor_; }
 356
 357   const gfx::Transform& DrawTransform() const;
 358
 359   scoped_ptr<ScrollAndScaleSet> ProcessScrollDeltas();
 360
 361   bool needs_animate_layers() const {
 362     return !animation_registrar_->active_animation_controllers().empty();
 363   }
 364
 365   void set_max_memory_needed_bytes(size_t bytes) {
 366     max_memory_needed_bytes_ = bytes;
 367   }
 368
 369   FrameRateCounter* fps_counter() {
 370     return fps_counter_.get();
 371   }
 372   PaintTimeCounter* paint_time_counter() {
 373     return paint_time_counter_.get();
 374   }
 375   MemoryHistory* memory_history() {
 376     return memory_history_.get();
 377   }
 378   DebugRectHistory* debug_rect_history() {
 379     return debug_rect_history_.get();
 380   }
 381   ResourceProvider* resource_provider() {
 382     return resource_provider_.get();
 383   }
 384   TopControlsManager* top_controls_manager() {
 385     return top_controls_manager_.get();
 386   }
 387   const GlobalStateThatImpactsTilePriority& global_tile_state() {
 388     return global_tile_state_;
 389   }
 390
 391   Proxy* proxy() const { return proxy_; }
 392
 393   AnimationRegistrar* animation_registrar() const {
 394     return animation_registrar_.get();
 395   }
 396
 397   void SetDebugState(const LayerTreeDebugState& new_debug_state);
 398   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 399
 400   class CC_EXPORT CullRenderPassesWithNoQuads {
 401    public:
 402     bool ShouldRemoveRenderPass(const RenderPassDrawQuad& quad,
 403                                 const FrameData& frame) const;
 404
 405     // Iterates in draw order, so that when a surface is removed, and its
 406     // target becomes empty, then its target can be removed also.
 407     size_t RenderPassListBegin(const RenderPassList& list) const { return 0; }
 408     size_t RenderPassListEnd(const RenderPassList& list) const {
 409       return list.size();
 410     }
 411     size_t RenderPassListNext(size_t it) const { return it + 1; }
 412   };
 413
 414   template <typename RenderPassCuller>
 415       static void RemoveRenderPasses(RenderPassCuller culler, FrameData* frame);
 416
 417   gfx::Vector2dF accumulated_root_overscroll() const {
 418     return accumulated_root_overscroll_;
 419   }
 420
 421   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 422
 423   void SetTreePriority(TreePriority priority);
 424
 425   void UpdateCurrentBeginFrameArgs(const BeginFrameArgs& args);
 426   void ResetCurrentBeginFrameArgsForNextFrame();
 427   virtual BeginFrameArgs CurrentBeginFrameArgs() const;
 428
 429   // Expected time between two begin impl frame calls.
 430   base::TimeDelta begin_impl_frame_interval() const {
 431     return begin_impl_frame_interval_;
 432   }
 433
 434   void AsValueInto(base::debug::TracedValue* value) const {
 435     return AsValueWithFrameInto(NULL, value);
 436   }
 437   void AsValueWithFrameInto(FrameData* frame,
 438                             base::debug::TracedValue* value) const;
 439   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
 440   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValueWithFrame(
 441       FrameData* frame) const;
 442   scoped_refptr<base::debug::ConvertableToTraceFormat> ActivationStateAsValue()
 443       const;
 444   void ActivationStateAsValueInto(base::debug::TracedValue* value) const;
 445
 446   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 447
 448   virtual void CreateUIResource(UIResourceId uid,
 449                                 const UIResourceBitmap& bitmap);
 450   // Deletes a UI resource.  May safely be called more than once.
 451   virtual void DeleteUIResource(UIResourceId uid);
 452   void EvictAllUIResources();
 453   bool EvictedUIResourcesExist() const;
 454
 455   virtual ResourceProvider::ResourceId ResourceIdForUIResource(
 456       UIResourceId uid) const;
 457
 458   virtual bool IsUIResourceOpaque(UIResourceId uid) const;
 459
 460   struct UIResourceData {
 461     ResourceProvider::ResourceId resource_id;
 462     gfx::Size size;
 463     bool opaque;
 464   };
 465
 466   void ScheduleMicroBenchmark(scoped_ptr<MicroBenchmarkImpl> benchmark);
 467
 468   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
 469   // Viewport rectangle and clip in nonflipped window space.  These rects
 470   // should only be used by Renderer subclasses to populate glViewport/glClip
 471   // and their software-mode equivalents.
 472   gfx::Rect DeviceViewport() const;
 473   gfx::Rect DeviceClip() const;
 474
 475   // When a SwapPromiseMonitor is created on the impl thread, it calls
 476   // InsertSwapPromiseMonitor() to register itself with LayerTreeHostImpl.
 477   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 478   // to unregister itself.
 479   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 480   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 481
 482   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 483   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 484
 485   void GetPictureLayerImplPairs(
 486       std::vector<PictureLayerImpl::Pair>* layers) const;
 487
 488  protected:
 489   LayerTreeHostImpl(
 490       const LayerTreeSettings& settings,
 491       LayerTreeHostImplClient* client,
 492       Proxy* proxy,
 493       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 494       SharedBitmapManager* manager,
 495       int id);
 496
 497   void UpdateInnerViewportContainerSize();
 498
 499   // Virtual for testing.
 500   virtual void AnimateLayers(base::TimeTicks monotonic_time);
 501
 502   // Virtual for testing.
 503   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
 504
 505   const AnimationRegistrar::AnimationControllerMap&
 506       active_animation_controllers() const {
 507     return animation_registrar_->active_animation_controllers();
 508   }
 509
 510   bool manage_tiles_needed() const { return tile_priorities_dirty_; }
 511
 512   LayerTreeHostImplClient* client_;
 513   Proxy* proxy_;
 514
 515  private:
 516   void CreateAndSetRenderer();
 517   void CreateAndSetTileManager();
 518   void DestroyTileManager();
 519   void ReleaseTreeResources();
 520   void EnforceZeroBudget(bool zero_budget);
 521
 522   bool UsePendingTreeForSync() const;
 523   bool UseZeroCopyTextureUpload() const;
 524   bool UseOneCopyTextureUpload() const;
 525
 526   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
 527   void AnimatePageScale(base::TimeTicks monotonic_time);
 528   void AnimateScrollbars(base::TimeTicks monotonic_time);
 529   void AnimateTopControls(base::TimeTicks monotonic_time);
 530
 531   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
 532       LayerImpl* layer_impl,
 533       float scale_from_viewport_to_screen_space,
 534       const gfx::PointF& viewport_point,
 535       const gfx::Vector2dF& viewport_delta);
 536
 537   void TrackDamageForAllSurfaces(
 538       LayerImpl* root_draw_layer,
 539       const LayerImplList& render_surface_layer_list);
 540
 541   void UpdateTileManagerMemoryPolicy(const ManagedMemoryPolicy& policy);
 542
 543   // This function should only be called from PrepareToDraw, as DidDrawAllLayers
 544   // must be called if this helper function is called.  Returns DRAW_SUCCESS if
 545   // the frame should be drawn.
 546   DrawResult CalculateRenderPasses(FrameData* frame);
 547
 548   void ClearCurrentlyScrollingLayer();
 549
 550   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
 551                                 const gfx::PointF& device_viewport_point);
 552
 553   void AnimateScrollbarsRecursive(LayerImpl* layer,
 554                                   base::TimeTicks time);
 555
 556   LayerImpl* FindScrollLayerForDeviceViewportPoint(
 557       const gfx::PointF& device_viewport_point,
 558       InputHandler::ScrollInputType type,
 559       LayerImpl* layer_hit_by_point,
 560       bool* scroll_on_main_thread,
 561       bool* optional_has_ancestor_scroll_handler) const;
 562   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
 563                                    LayerImpl* layer_impl);
 564   void StartScrollbarFadeRecursive(LayerImpl* layer);
 565   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
 566                               bool zero_budget);
 567   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 568
 569   void DidInitializeVisibleTile();
 570
 571   void MarkUIResourceNotEvicted(UIResourceId uid);
 572
 573   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
 574   void NotifySwapPromiseMonitorsOfForwardingToMainThread();
 575
 576   typedef base::hash_map<UIResourceId, UIResourceData>
 577       UIResourceMap;
 578   UIResourceMap ui_resource_map_;
 579
 580   // Resources that were evicted by EvictAllUIResources. Resources are removed
 581   // from this when they are touched by a create or destroy from the UI resource
 582   // request queue.
 583   std::set<UIResourceId> evicted_ui_resources_;
 584
 585   scoped_ptr<OutputSurface> output_surface_;
 586   scoped_refptr<ContextProvider> offscreen_context_provider_;
 587
 588   // |resource_provider_| and |tile_manager_| can be NULL, e.g. when using tile-
 589   // free rendering - see OutputSurface::ForcedDrawToSoftwareDevice().
 590   scoped_ptr<ResourceProvider> resource_provider_;
 591   scoped_ptr<TileManager> tile_manager_;
 592   bool use_gpu_rasterization_;
 593   scoped_ptr<RasterWorkerPool> raster_worker_pool_;
 594   scoped_ptr<ResourcePool> resource_pool_;
 595   scoped_ptr<ResourcePool> staging_resource_pool_;
 596   scoped_ptr<Renderer> renderer_;
 597
 598   GlobalStateThatImpactsTilePriority global_tile_state_;
 599
 600   // Tree currently being drawn.
 601   scoped_ptr<LayerTreeImpl> active_tree_;
 602
 603   // In impl-side painting mode, tree with possibly incomplete rasterized
 604   // content. May be promoted to active by ActivatePendingTree().
 605   scoped_ptr<LayerTreeImpl> pending_tree_;
 606
 607   // In impl-side painting mode, inert tree with layers that can be recycled
 608   // by the next sync from the main thread.
 609   scoped_ptr<LayerTreeImpl> recycle_tree_;
 610
 611   InputHandlerClient* input_handler_client_;
 612   bool did_lock_scrolling_layer_;
 613   bool should_bubble_scrolls_;
 614   bool wheel_scrolling_;
 615   bool scroll_affects_scroll_handler_;
 616   int scroll_layer_id_when_mouse_over_scrollbar_;
 617   ScopedPtrVector<SwapPromise> swap_promises_for_main_thread_scroll_update_;
 618
 619   bool tile_priorities_dirty_;
 620
 621   // The optional delegate for the root layer scroll offset.
 622   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 623   LayerTreeSettings settings_;
 624   LayerTreeDebugState debug_state_;
 625   bool visible_;
 626   ManagedMemoryPolicy cached_managed_memory_policy_;
 627
 628   gfx::Vector2dF accumulated_root_overscroll_;
 629
 630   bool pinch_gesture_active_;
 631   bool pinch_gesture_end_should_clear_scrolling_layer_;
 632   gfx::Point previous_pinch_anchor_;
 633
 634   scoped_ptr<TopControlsManager> top_controls_manager_;
 635
 636   scoped_ptr<PageScaleAnimation> page_scale_animation_;
 637
 638   // This is used for ticking animations slowly when hidden.
 639   scoped_ptr<LayerTreeHostImplTimeSourceAdapter> time_source_client_adapter_;
 640
 641   scoped_ptr<FrameRateCounter> fps_counter_;
 642   scoped_ptr<PaintTimeCounter> paint_time_counter_;
 643   scoped_ptr<MemoryHistory> memory_history_;
 644   scoped_ptr<DebugRectHistory> debug_rect_history_;
 645
 646   scoped_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
 647
 648   // The maximum memory that would be used by the prioritized resource
 649   // manager, if there were no limit on memory usage.
 650   size_t max_memory_needed_bytes_;
 651
 652   bool zero_budget_;
 653
 654   // Viewport size passed in from the main thread, in physical pixels.  This
 655   // value is the default size for all concepts of physical viewport (draw
 656   // viewport, scrolling viewport and device viewport), but it can be
 657   // overridden.
 658   gfx::Size device_viewport_size_;
 659
 660   // Conversion factor from CSS pixels to physical pixels when
 661   // pageScaleFactor=1.
 662   float device_scale_factor_;
 663
 664   // UI resource to use for drawing overhang gutters.
 665   UIResourceId overhang_ui_resource_id_;
 666   gfx::Size overhang_ui_resource_size_;
 667
 668   // Height of the top controls as known by Blink.
 669   float top_controls_layout_height_;
 670
 671   // Optional top-level constraints that can be set by the OutputSurface.
 672   // - external_transform_ applies a transform above the root layer
 673   // - external_viewport_ is used DrawProperties, tile management and
 674   // glViewport/window projection matrix.
 675   // - external_clip_ specifies a top-level clip rect
 676   // - viewport_rect_for_tile_priority_ is the rect in view space used for
 677   // tiling priority.
 678   gfx::Transform external_transform_;
 679   gfx::Rect external_viewport_;
 680   gfx::Rect external_clip_;
 681   gfx::Rect viewport_rect_for_tile_priority_;
 682   bool resourceless_software_draw_;
 683
 684   gfx::Rect viewport_damage_rect_;
 685
 686   BeginFrameArgs current_begin_frame_args_;
 687
 688   // Expected time between two begin impl frame calls.
 689   base::TimeDelta begin_impl_frame_interval_;
 690
 691   scoped_ptr<AnimationRegistrar> animation_registrar_;
 692
 693   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 694   MicroBenchmarkControllerImpl micro_benchmark_controller_;
 695
 696   bool need_to_update_visible_tiles_before_draw_;
 697   bool have_valid_output_surface_;
 698
 699   // Optional callback to notify of new tree activations.
 700   base::Closure tree_activation_callback_;
 701
 702   SharedBitmapManager* shared_bitmap_manager_;
 703   int id_;
 704
 705   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 706
 707   size_t transfer_buffer_memory_limit_;
 708
 709   std::vector<PictureLayerImpl*> picture_layers_;
 710   std::vector<PictureLayerImpl::Pair> picture_layer_pairs_;
 711
 712   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 713 };
 714
 715 }  // namespace cc
 716
 717 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_