src/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   void ResetRecycleTreeForTesting();
 221
 222   DrawMode GetDrawMode() const;
 223
 224   // Viewport size in draw space: this size is in physical pixels and is used
 225   // for draw properties, tilings, quads and render passes.
 226   gfx::Size DrawViewportSize() const;
 227
 228   // Viewport rect in view space used for tiling prioritization.
 229   const gfx::Rect ViewportRectForTilePriority() const;
 230
 231   // Viewport size for scrolling and fixed-position compensation. This value
 232   // excludes the URL bar and non-overlay scrollbars and is in DIP (and
 233   // invariant relative to page scale).
 234   gfx::SizeF UnscaledScrollableViewportSize() const;
 235   float VerticalAdjust() const;
 236
 237   // RendererClient implementation.
 238   virtual void SetFullRootLayerDamage() OVERRIDE;
 239   virtual void RunOnDemandRasterTask(Task* on_demand_raster_task) OVERRIDE;
 240
 241   // TileManagerClient implementation.
 242   virtual const std::vector<PictureLayerImpl*>& GetPictureLayers()
 243       const OVERRIDE;
 244   virtual void NotifyReadyToActivate() OVERRIDE;
 245   virtual void NotifyTileStateChanged(const Tile* tile) OVERRIDE;
 246   virtual void BuildRasterQueue(RasterTilePriorityQueue* queue,
 247                                 TreePriority tree_priority) OVERRIDE;
 248   virtual void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
 249                                   TreePriority tree_priority) OVERRIDE;
 250
 251   // ScrollbarAnimationControllerClient implementation.
 252   virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
 253                                         base::TimeDelta delay) OVERRIDE;
 254   virtual void SetNeedsScrollbarAnimationFrame() OVERRIDE;
 255
 256   // OutputSurfaceClient implementation.
 257   virtual void DeferredInitialize() OVERRIDE;
 258   virtual void ReleaseGL() OVERRIDE;
 259   virtual void CommitVSyncParameters(base::TimeTicks timebase,
 260                                      base::TimeDelta interval) OVERRIDE;
 261   virtual void SetNeedsRedrawRect(const gfx::Rect& rect) OVERRIDE;
 262   virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE;
 263
 264   virtual void SetExternalDrawConstraints(
 265       const gfx::Transform& transform,
 266       const gfx::Rect& viewport,
 267       const gfx::Rect& clip,
 268       const gfx::Rect& viewport_rect_for_tile_priority,
 269       const gfx::Transform& transform_for_tile_priority,
 270       bool resourceless_software_draw) OVERRIDE;
 271   virtual void DidLoseOutputSurface() OVERRIDE;
 272   virtual void DidSwapBuffers() OVERRIDE;
 273   virtual void DidSwapBuffersComplete() OVERRIDE;
 274   virtual void ReclaimResources(const CompositorFrameAck* ack) OVERRIDE;
 275   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
 276   virtual void SetTreeActivationCallback(const base::Closure& callback)
 277       OVERRIDE;
 278
 279   // Called from LayerTreeImpl.
 280   void OnCanDrawStateChangedForTree();
 281
 282   // Implementation.
 283   int id() const { return id_; }
 284   bool CanDraw() const;
 285   OutputSurface* output_surface() const { return output_surface_.get(); }
 286
 287   std::string LayerTreeAsJson() const;
 288
 289   void FinishAllRendering();
 290   int SourceAnimationFrameNumber() const;
 291
 292   virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
 293   bool IsContextLost();
 294   TileManager* tile_manager() { return tile_manager_.get(); }
 295   void SetUseGpuRasterization(bool use_gpu);
 296   bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
 297   bool create_low_res_tiling() const {
 298     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
 299   }
 300   ResourcePool* resource_pool() { return resource_pool_.get(); }
 301   Renderer* renderer() { return renderer_.get(); }
 302   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
 303
 304   virtual bool SwapBuffers(const FrameData& frame);
 305   void SetNeedsBeginFrame(bool enable);
 306   virtual void WillBeginImplFrame(const BeginFrameArgs& args);
 307   void DidModifyTilePriorities();
 308
 309   LayerTreeImpl* active_tree() { return active_tree_.get(); }
 310   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
 311   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
 312   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
 313   LayerTreeImpl* recycle_tree() { return recycle_tree_.get(); }
 314   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
 315   // Returns the tree LTH synchronizes with.
 316   LayerTreeImpl* sync_tree() {
 317     return pending_tree_ ? pending_tree_.get() : active_tree_.get();
 318   }
 319   virtual void CreatePendingTree();
 320   virtual void UpdateVisibleTiles();
 321   virtual void ActivateSyncTree();
 322
 323   // Shortcuts to layers on the active tree.
 324   LayerImpl* RootLayer() const;
 325   LayerImpl* InnerViewportScrollLayer() const;
 326   LayerImpl* OuterViewportScrollLayer() const;
 327   LayerImpl* CurrentlyScrollingLayer() const;
 328
 329   int scroll_layer_id_when_mouse_over_scrollbar() const {
 330     return scroll_layer_id_when_mouse_over_scrollbar_;
 331   }
 332   bool scroll_affects_scroll_handler() const {
 333     return scroll_affects_scroll_handler_;
 334   }
 335   void QueueSwapPromiseForMainThreadScrollUpdate(
 336       scoped_ptr<SwapPromise> swap_promise);
 337
 338   bool IsCurrentlyScrolling() const;
 339
 340   virtual void SetVisible(bool visible);
 341   bool visible() const { return visible_; }
 342
 343   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
 344   void SetNeedsRedraw();
 345
 346   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
 347
 348   size_t memory_allocation_limit_bytes() const;
 349   int memory_allocation_priority_cutoff() const;
 350
 351   void SetViewportSize(const gfx::Size& device_viewport_size);
 352   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 353
 354   void SetOverdrawBottomHeight(float overdraw_bottom_height);
 355   float overdraw_bottom_height() const { return overdraw_bottom_height_; }
 356
 357   void SetOverhangUIResource(UIResourceId overhang_ui_resource_id,
 358                              const gfx::Size& overhang_ui_resource_size);
 359
 360   void SetDeviceScaleFactor(float device_scale_factor);
 361   float device_scale_factor() const { return device_scale_factor_; }
 362
 363   const gfx::Transform& DrawTransform() const;
 364
 365   scoped_ptr<ScrollAndScaleSet> ProcessScrollDeltas();
 366
 367   bool needs_animate_layers() const {
 368     return !animation_registrar_->active_animation_controllers().empty();
 369   }
 370
 371   void set_max_memory_needed_bytes(size_t bytes) {
 372     max_memory_needed_bytes_ = bytes;
 373   }
 374
 375   FrameRateCounter* fps_counter() {
 376     return fps_counter_.get();
 377   }
 378   PaintTimeCounter* paint_time_counter() {
 379     return paint_time_counter_.get();
 380   }
 381   MemoryHistory* memory_history() {
 382     return memory_history_.get();
 383   }
 384   DebugRectHistory* debug_rect_history() {
 385     return debug_rect_history_.get();
 386   }
 387   ResourceProvider* resource_provider() {
 388     return resource_provider_.get();
 389   }
 390   TopControlsManager* top_controls_manager() {
 391     return top_controls_manager_.get();
 392   }
 393   const GlobalStateThatImpactsTilePriority& global_tile_state() {
 394     return global_tile_state_;
 395   }
 396
 397   Proxy* proxy() const { return proxy_; }
 398
 399   AnimationRegistrar* animation_registrar() const {
 400     return animation_registrar_.get();
 401   }
 402
 403   void SetDebugState(const LayerTreeDebugState& new_debug_state);
 404   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 405
 406   class CC_EXPORT CullRenderPassesWithNoQuads {
 407    public:
 408     bool ShouldRemoveRenderPass(const RenderPassDrawQuad& quad,
 409                                 const FrameData& frame) const;
 410
 411     // Iterates in draw order, so that when a surface is removed, and its
 412     // target becomes empty, then its target can be removed also.
 413     size_t RenderPassListBegin(const RenderPassList& list) const { return 0; }
 414     size_t RenderPassListEnd(const RenderPassList& list) const {
 415       return list.size();
 416     }
 417     size_t RenderPassListNext(size_t it) const { return it + 1; }
 418   };
 419
 420   template <typename RenderPassCuller>
 421       static void RemoveRenderPasses(RenderPassCuller culler, FrameData* frame);
 422
 423   gfx::Vector2dF accumulated_root_overscroll() const {
 424     return accumulated_root_overscroll_;
 425   }
 426
 427   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 428
 429   void SetTreePriority(TreePriority priority);
 430
 431   void UpdateCurrentFrameTime();
 432   void ResetCurrentFrameTimeForNextFrame();
 433   virtual base::TimeTicks CurrentFrameTimeTicks();
 434
 435   // Expected time between two begin impl frame calls.
 436   base::TimeDelta begin_impl_frame_interval() const {
 437     return begin_impl_frame_interval_;
 438   }
 439
 440   void AsValueInto(base::debug::TracedValue* value) const {
 441     return AsValueWithFrameInto(NULL, value);
 442   }
 443   void AsValueWithFrameInto(FrameData* frame,
 444                             base::debug::TracedValue* value) const;
 445   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
 446   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValueWithFrame(
 447       FrameData* frame) const;
 448   scoped_refptr<base::debug::ConvertableToTraceFormat> ActivationStateAsValue()
 449       const;
 450   void ActivationStateAsValueInto(base::debug::TracedValue* value) const;
 451
 452   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 453
 454   virtual void CreateUIResource(UIResourceId uid,
 455                                 const UIResourceBitmap& bitmap);
 456   // Deletes a UI resource.  May safely be called more than once.
 457   virtual void DeleteUIResource(UIResourceId uid);
 458   void EvictAllUIResources();
 459   bool EvictedUIResourcesExist() const;
 460
 461   virtual ResourceProvider::ResourceId ResourceIdForUIResource(
 462       UIResourceId uid) const;
 463
 464   virtual bool IsUIResourceOpaque(UIResourceId uid) const;
 465
 466   struct UIResourceData {
 467     ResourceProvider::ResourceId resource_id;
 468     gfx::Size size;
 469     bool opaque;
 470   };
 471
 472   void ScheduleMicroBenchmark(scoped_ptr<MicroBenchmarkImpl> benchmark);
 473
 474   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
 475   // Viewport rectangle and clip in nonflipped window space.  These rects
 476   // should only be used by Renderer subclasses to populate glViewport/glClip
 477   // and their software-mode equivalents.
 478   gfx::Rect DeviceViewport() const;
 479   gfx::Rect DeviceClip() const;
 480
 481   // When a SwapPromiseMonitor is created on the impl thread, it calls
 482   // InsertSwapPromiseMonitor() to register itself with LayerTreeHostImpl.
 483   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 484   // to unregister itself.
 485   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 486   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 487
 488   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 489   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 490
 491   void GetPictureLayerImplPairs(
 492       std::vector<PictureLayerImpl::Pair>* layers) const;
 493
 494  protected:
 495   LayerTreeHostImpl(
 496       const LayerTreeSettings& settings,
 497       LayerTreeHostImplClient* client,
 498       Proxy* proxy,
 499       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 500       SharedBitmapManager* manager,
 501       int id);
 502
 503   gfx::SizeF ComputeInnerViewportContainerSize() const;
 504   void UpdateInnerViewportContainerSize();
 505
 506   // Virtual for testing.
 507   virtual void AnimateLayers(base::TimeTicks monotonic_time);
 508
 509   // Virtual for testing.
 510   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
 511
 512   const AnimationRegistrar::AnimationControllerMap&
 513       active_animation_controllers() const {
 514     return animation_registrar_->active_animation_controllers();
 515   }
 516
 517   bool manage_tiles_needed() const { return tile_priorities_dirty_; }
 518
 519   LayerTreeHostImplClient* client_;
 520   Proxy* proxy_;
 521
 522  private:
 523   void CreateAndSetRenderer();
 524   void CreateAndSetTileManager();
 525   void DestroyTileManager();
 526   void ReleaseTreeResources();
 527   void EnforceZeroBudget(bool zero_budget);
 528
 529   bool UsePendingTreeForSync() const;
 530   bool UseZeroCopyTextureUpload() const;
 531   bool UseOneCopyTextureUpload() const;
 532
 533   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
 534   void AnimatePageScale(base::TimeTicks monotonic_time);
 535   void AnimateScrollbars(base::TimeTicks monotonic_time);
 536   void AnimateTopControls(base::TimeTicks monotonic_time);
 537
 538   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
 539       LayerImpl* layer_impl,
 540       float scale_from_viewport_to_screen_space,
 541       const gfx::PointF& viewport_point,
 542       const gfx::Vector2dF& viewport_delta);
 543
 544   void TrackDamageForAllSurfaces(
 545       LayerImpl* root_draw_layer,
 546       const LayerImplList& render_surface_layer_list);
 547
 548   void UpdateTileManagerMemoryPolicy(const ManagedMemoryPolicy& policy);
 549
 550   // This function should only be called from PrepareToDraw, as DidDrawAllLayers
 551   // must be called if this helper function is called.  Returns DRAW_SUCCESS if
 552   // the frame should be drawn.
 553   DrawResult CalculateRenderPasses(FrameData* frame);
 554
 555   void ClearCurrentlyScrollingLayer();
 556
 557   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
 558                                 const gfx::PointF& device_viewport_point);
 559
 560   void AnimateScrollbarsRecursive(LayerImpl* layer,
 561                                   base::TimeTicks time);
 562
 563   LayerImpl* FindScrollLayerForDeviceViewportPoint(
 564       const gfx::PointF& device_viewport_point,
 565       InputHandler::ScrollInputType type,
 566       LayerImpl* layer_hit_by_point,
 567       bool* scroll_on_main_thread,
 568       bool* optional_has_ancestor_scroll_handler) const;
 569   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
 570                                    LayerImpl* layer_impl);
 571   void StartScrollbarFadeRecursive(LayerImpl* layer);
 572   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
 573                               bool zero_budget);
 574   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 575
 576   void DidInitializeVisibleTile();
 577
 578   void MarkUIResourceNotEvicted(UIResourceId uid);
 579
 580   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
 581   void NotifySwapPromiseMonitorsOfForwardingToMainThread();
 582
 583   typedef base::hash_map<UIResourceId, UIResourceData>
 584       UIResourceMap;
 585   UIResourceMap ui_resource_map_;
 586
 587   // Resources that were evicted by EvictAllUIResources. Resources are removed
 588   // from this when they are touched by a create or destroy from the UI resource
 589   // request queue.
 590   std::set<UIResourceId> evicted_ui_resources_;
 591
 592   scoped_ptr<OutputSurface> output_surface_;
 593   scoped_refptr<ContextProvider> offscreen_context_provider_;
 594
 595   // |resource_provider_| and |tile_manager_| can be NULL, e.g. when using tile-
 596   // free rendering - see OutputSurface::ForcedDrawToSoftwareDevice().
 597   scoped_ptr<ResourceProvider> resource_provider_;
 598   scoped_ptr<TileManager> tile_manager_;
 599   bool use_gpu_rasterization_;
 600   scoped_ptr<RasterWorkerPool> raster_worker_pool_;
 601   scoped_ptr<ResourcePool> resource_pool_;
 602   scoped_ptr<ResourcePool> staging_resource_pool_;
 603   scoped_ptr<Renderer> renderer_;
 604
 605   TaskGraphRunner synchronous_task_graph_runner_;
 606   TaskGraphRunner* on_demand_task_graph_runner_;
 607   NamespaceToken on_demand_task_namespace_;
 608
 609   GlobalStateThatImpactsTilePriority global_tile_state_;
 610
 611   // Tree currently being drawn.
 612   scoped_ptr<LayerTreeImpl> active_tree_;
 613
 614   // In impl-side painting mode, tree with possibly incomplete rasterized
 615   // content. May be promoted to active by ActivatePendingTree().
 616   scoped_ptr<LayerTreeImpl> pending_tree_;
 617
 618   // In impl-side painting mode, inert tree with layers that can be recycled
 619   // by the next sync from the main thread.
 620   scoped_ptr<LayerTreeImpl> recycle_tree_;
 621
 622   InputHandlerClient* input_handler_client_;
 623   bool did_lock_scrolling_layer_;
 624   bool should_bubble_scrolls_;
 625   bool wheel_scrolling_;
 626   bool scroll_affects_scroll_handler_;
 627   int scroll_layer_id_when_mouse_over_scrollbar_;
 628   ScopedPtrVector<SwapPromise> swap_promises_for_main_thread_scroll_update_;
 629
 630   bool tile_priorities_dirty_;
 631
 632   // The optional delegate for the root layer scroll offset.
 633   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 634   LayerTreeSettings settings_;
 635   LayerTreeDebugState debug_state_;
 636   bool visible_;
 637   ManagedMemoryPolicy cached_managed_memory_policy_;
 638
 639   gfx::Vector2dF accumulated_root_overscroll_;
 640
 641   bool pinch_gesture_active_;
 642   bool pinch_gesture_end_should_clear_scrolling_layer_;
 643   gfx::Point previous_pinch_anchor_;
 644
 645   scoped_ptr<TopControlsManager> top_controls_manager_;
 646
 647   scoped_ptr<PageScaleAnimation> page_scale_animation_;
 648
 649   // This is used for ticking animations slowly when hidden.
 650   scoped_ptr<LayerTreeHostImplTimeSourceAdapter> time_source_client_adapter_;
 651
 652   scoped_ptr<FrameRateCounter> fps_counter_;
 653   scoped_ptr<PaintTimeCounter> paint_time_counter_;
 654   scoped_ptr<MemoryHistory> memory_history_;
 655   scoped_ptr<DebugRectHistory> debug_rect_history_;
 656
 657   scoped_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
 658
 659   // The maximum memory that would be used by the prioritized resource
 660   // manager, if there were no limit on memory usage.
 661   size_t max_memory_needed_bytes_;
 662
 663   bool zero_budget_;
 664
 665   // Viewport size passed in from the main thread, in physical pixels.  This
 666   // value is the default size for all concepts of physical viewport (draw
 667   // viewport, scrolling viewport and device viewport), but it can be
 668   // overridden.
 669   gfx::Size device_viewport_size_;
 670
 671   // Conversion factor from CSS pixels to physical pixels when
 672   // pageScaleFactor=1.
 673   float device_scale_factor_;
 674
 675   // UI resource to use for drawing overhang gutters.
 676   UIResourceId overhang_ui_resource_id_;
 677   gfx::Size overhang_ui_resource_size_;
 678
 679   // Vertical amount of the viewport size that's known to covered by a
 680   // browser-side UI element, such as an on-screen-keyboard.  This affects
 681   // scrollable size since we want to still be able to scroll to the bottom of
 682   // the page when the keyboard is up.
 683   float overdraw_bottom_height_;
 684
 685   // Optional top-level constraints that can be set by the OutputSurface.
 686   // - external_transform_ applies a transform above the root layer
 687   // - external_viewport_ is used DrawProperties, tile management and
 688   // glViewport/window projection matrix.
 689   // - external_clip_ specifies a top-level clip rect
 690   // - viewport_rect_for_tile_priority_ is the rect in view space used for
 691   // tiling priority.
 692   gfx::Transform external_transform_;
 693   gfx::Rect external_viewport_;
 694   gfx::Rect external_clip_;
 695   gfx::Rect viewport_rect_for_tile_priority_;
 696   bool resourceless_software_draw_;
 697
 698   gfx::Rect viewport_damage_rect_;
 699
 700   base::TimeTicks current_frame_timeticks_;
 701
 702   // Expected time between two begin impl frame calls.
 703   base::TimeDelta begin_impl_frame_interval_;
 704
 705   scoped_ptr<AnimationRegistrar> animation_registrar_;
 706
 707   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 708   MicroBenchmarkControllerImpl micro_benchmark_controller_;
 709
 710   bool need_to_update_visible_tiles_before_draw_;
 711   bool have_valid_output_surface_;
 712
 713   // Optional callback to notify of new tree activations.
 714   base::Closure tree_activation_callback_;
 715
 716   SharedBitmapManager* shared_bitmap_manager_;
 717   int id_;
 718
 719   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 720
 721   size_t transfer_buffer_memory_limit_;
 722
 723   std::vector<PictureLayerImpl*> picture_layers_;
 724   std::vector<PictureLayerImpl::Pair> picture_layer_pairs_;
 725
 726   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 727 };
 728
 729 }  // namespace cc
 730
 731 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_