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 <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "base/containers/hash_tables.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/time/time.h"
  16 #include "cc/animation/animation_events.h"
  17 #include "cc/animation/animation_registrar.h"
  18 #include "cc/animation/scrollbar_animation_controller.h"
  19 #include "cc/base/cc_export.h"
  20 #include "cc/base/synced_property.h"
  21 #include "cc/debug/frame_timing_tracker.h"
  22 #include "cc/debug/micro_benchmark_controller_impl.h"
  23 #include "cc/input/input_handler.h"
  24 #include "cc/input/layer_scroll_offset_delegate.h"
  25 #include "cc/input/top_controls_manager_client.h"
  26 #include "cc/layers/layer_lists.h"
  27 #include "cc/layers/render_pass_sink.h"
  28 #include "cc/output/begin_frame_args.h"
  29 #include "cc/output/managed_memory_policy.h"
  30 #include "cc/output/output_surface_client.h"
  31 #include "cc/output/renderer.h"
  32 #include "cc/quads/render_pass.h"
  33 #include "cc/resources/resource_provider.h"
  34 #include "cc/resources/tile_manager.h"
  35 #include "cc/resources/ui_resource_client.h"
  36 #include "cc/scheduler/commit_earlyout_reason.h"
  37 #include "cc/scheduler/draw_result.h"
  38 #include "cc/trees/layer_tree_settings.h"
  39 #include "cc/trees/proxy.h"
  40 #include "skia/ext/refptr.h"
  41 #include "third_party/skia/include/core/SkColor.h"
  42 #include "ui/gfx/geometry/rect.h"
  43
  44 namespace gfx {
  45 class ScrollOffset;
  46 }
  47
  48 namespace cc {
  49
  50 class CompletionEvent;
  51 class CompositorFrameMetadata;
  52 class DebugRectHistory;
  53 class EvictionTilePriorityQueue;
  54 class FrameRateCounter;
  55 class LayerImpl;
  56 class LayerTreeImpl;
  57 class MemoryHistory;
  58 class PageScaleAnimation;
  59 class PaintTimeCounter;
  60 class PictureLayerImpl;
  61 class RasterTilePriorityQueue;
  62 class TileTaskWorkerPool;
  63 class RenderPassDrawQuad;
  64 class RenderingStatsInstrumentation;
  65 class ResourcePool;
  66 class ScrollElasticityHelper;
  67 class ScrollbarLayerImplBase;
  68 class SwapPromise;
  69 class SwapPromiseMonitor;
  70 class TextureMailboxDeleter;
  71 class TopControlsManager;
  72 class UIResourceBitmap;
  73 class UIResourceRequest;
  74 struct ScrollAndScaleSet;
  75 class Viewport;
  76
  77 enum class GpuRasterizationStatus {
  78   ON,
  79   ON_FORCED,
  80   OFF_DEVICE,
  81   OFF_VIEWPORT,
  82   OFF_CONTENT
  83 };
  84
  85 // LayerTreeHost->Proxy callback interface.
  86 class LayerTreeHostImplClient {
  87  public:
  88   virtual void UpdateRendererCapabilitiesOnImplThread() = 0;
  89   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
  90   virtual void CommitVSyncParameters(base::TimeTicks timebase,
  91                                      base::TimeDelta interval) = 0;
  92   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) = 0;
  93   virtual void SetMaxSwapsPendingOnImplThread(int max) = 0;
  94   virtual void DidSwapBuffersOnImplThread() = 0;
  95   virtual void DidSwapBuffersCompleteOnImplThread() = 0;
  96   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
  97   virtual void NotifyReadyToActivate() = 0;
  98   virtual void NotifyReadyToDraw() = 0;
  99   // Please call these 3 functions through
 100   // LayerTreeHostImpl's SetNeedsRedraw(), SetNeedsRedrawRect() and
 101   // SetNeedsAnimate().
 102   virtual void SetNeedsRedrawOnImplThread() = 0;
 103   virtual void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) = 0;
 104   virtual void SetNeedsAnimateOnImplThread() = 0;
 105   virtual void SetNeedsCommitOnImplThread() = 0;
 106   virtual void SetNeedsPrepareTilesOnImplThread() = 0;
 107   virtual void PostAnimationEventsToMainThreadOnImplThread(
 108       scoped_ptr<AnimationEventsVector> events) = 0;
 109   // Returns true if resources were deleted by this call.
 110   virtual bool ReduceContentsTextureMemoryOnImplThread(
 111       size_t limit_bytes,
 112       int priority_cutoff) = 0;
 113   virtual bool IsInsideDraw() = 0;
 114   virtual void RenewTreePriority() = 0;
 115   virtual void PostDelayedAnimationTaskOnImplThread(const base::Closure& task,
 116                                                     base::TimeDelta delay) = 0;
 117   virtual void DidActivateSyncTree() = 0;
 118   virtual void DidPrepareTiles() = 0;
 119
 120   // Called when page scale animation has completed on the impl thread.
 121   virtual void DidCompletePageScaleAnimationOnImplThread() = 0;
 122
 123   // Called when output surface asks for a draw.
 124   virtual void OnDrawForOutputSurface() = 0;
 125
 126  protected:
 127   virtual ~LayerTreeHostImplClient() {}
 128 };
 129
 130 // LayerTreeHostImpl owns the LayerImpl trees as well as associated rendering
 131 // state.
 132 class CC_EXPORT LayerTreeHostImpl
 133     : public InputHandler,
 134       public RendererClient,
 135       public TileManagerClient,
 136       public OutputSurfaceClient,
 137       public TopControlsManagerClient,
 138       public ScrollbarAnimationControllerClient,
 139       public base::SupportsWeakPtr<LayerTreeHostImpl> {
 140  public:
 141   static scoped_ptr<LayerTreeHostImpl> Create(
 142       const LayerTreeSettings& settings,
 143       LayerTreeHostImplClient* client,
 144       Proxy* proxy,
 145       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 146       SharedBitmapManager* shared_bitmap_manager,
 147       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 148       TaskGraphRunner* task_graph_runner,
 149       int id);
 150   ~LayerTreeHostImpl() override;
 151
 152   // InputHandler implementation
 153   void BindToClient(InputHandlerClient* client) override;
 154   InputHandler::ScrollStatus ScrollBegin(
 155       const gfx::Point& viewport_point,
 156       InputHandler::ScrollInputType type) override;
 157   InputHandler::ScrollStatus ScrollAnimated(
 158       const gfx::Point& viewport_point,
 159       const gfx::Vector2dF& scroll_delta) override;
 160   InputHandlerScrollResult ScrollBy(
 161       const gfx::Point& viewport_point,
 162       const gfx::Vector2dF& scroll_delta) override;
 163   bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
 164                               ScrollDirection direction) override;
 165   void SetRootLayerScrollOffsetDelegate(
 166       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) override;
 167   void OnRootLayerDelegatedScrollOffsetChanged() override;
 168   void ScrollEnd() override;
 169   InputHandler::ScrollStatus FlingScrollBegin() override;
 170   void MouseMoveAt(const gfx::Point& viewport_point) override;
 171   void PinchGestureBegin() override;
 172   void PinchGestureUpdate(float magnify_delta,
 173                           const gfx::Point& anchor) override;
 174   void PinchGestureEnd() override;
 175   void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 176                                bool anchor_point,
 177                                float page_scale,
 178                                base::TimeDelta duration);
 179   void SetNeedsAnimate() override;
 180   bool IsCurrentlyScrollingLayerAt(const gfx::Point& viewport_point,
 181                                    InputHandler::ScrollInputType type) override;
 182   bool HaveWheelEventHandlersAt(const gfx::Point& viewport_point) override;
 183   bool DoTouchEventsBlockScrollAt(const gfx::Point& viewport_port) override;
 184   scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
 185       ui::LatencyInfo* latency) override;
 186   ScrollElasticityHelper* CreateScrollElasticityHelper() override;
 187
 188   // TopControlsManagerClient implementation.
 189   float TopControlsHeight() const override;
 190   void SetCurrentTopControlsShownRatio(float offset) override;
 191   float CurrentTopControlsShownRatio() const override;
 192   void DidChangeTopControlsPosition() override;
 193   bool HaveRootScrollLayer() const override;
 194
 195   void UpdateViewportContainerSizes();
 196
 197   struct CC_EXPORT FrameData : public RenderPassSink {
 198     FrameData();
 199     ~FrameData() override;
 200     void AsValueInto(base::trace_event::TracedValue* value) const;
 201
 202     std::vector<gfx::Rect> occluding_screen_space_rects;
 203     std::vector<gfx::Rect> non_occluding_screen_space_rects;
 204     std::vector<FrameTimingTracker::FrameAndRectIds> composite_events;
 205     RenderPassList render_passes;
 206     RenderPassIdHashMap render_passes_by_id;
 207     const LayerImplList* render_surface_layer_list;
 208     LayerImplList will_draw_layers;
 209     bool has_no_damage;
 210
 211     // RenderPassSink implementation.
 212     void AppendRenderPass(scoped_ptr<RenderPass> render_pass) override;
 213   };
 214
 215   virtual void BeginMainFrameAborted(CommitEarlyOutReason reason);
 216   virtual void BeginCommit();
 217   virtual void CommitComplete();
 218   virtual void Animate(base::TimeTicks monotonic_time);
 219   virtual void UpdateAnimationState(bool start_ready_animations);
 220   void ActivateAnimations();
 221   void MainThreadHasStoppedFlinging();
 222   void DidAnimateScrollOffset();
 223   void SetViewportDamage(const gfx::Rect& damage_rect);
 224
 225   virtual void PrepareTiles();
 226
 227   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
 228   // should try to avoid displaying the frame. If PrepareToDraw is called,
 229   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
 230   // called between the two.
 231   virtual DrawResult PrepareToDraw(FrameData* frame);
 232   virtual void DrawLayers(FrameData* frame, base::TimeTicks frame_begin_time);
 233   // Must be called if and only if PrepareToDraw was called.
 234   void DidDrawAllLayers(const FrameData& frame);
 235
 236   const LayerTreeSettings& settings() const { return settings_; }
 237
 238   // Evict all textures by enforcing a memory policy with an allocation of 0.
 239   void EvictTexturesForTesting();
 240
 241   // When blocking, this prevents client_->NotifyReadyToActivate() from being
 242   // called. When disabled, it calls client_->NotifyReadyToActivate()
 243   // immediately if any notifications had been blocked while blocking.
 244   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 245
 246   // Resets all of the trees to an empty state.
 247   void ResetTreesForTesting();
 248
 249   DrawMode GetDrawMode() const;
 250
 251   // Viewport size in draw space: this size is in physical pixels and is used
 252   // for draw properties, tilings, quads and render passes.
 253   gfx::Size DrawViewportSize() const;
 254
 255   // Viewport rect in view space used for tiling prioritization.
 256   const gfx::Rect ViewportRectForTilePriority() const;
 257
 258   // RendererClient implementation.
 259   void SetFullRootLayerDamage() override;
 260
 261   // TileManagerClient implementation.
 262   void NotifyReadyToActivate() override;
 263   void NotifyReadyToDraw() override;
 264   void NotifyTileStateChanged(const Tile* tile) override;
 265   scoped_ptr<RasterTilePriorityQueue> BuildRasterQueue(
 266       TreePriority tree_priority,
 267       RasterTilePriorityQueue::Type type) override;
 268   scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
 269       TreePriority tree_priority) override;
 270   void SetIsLikelyToRequireADraw(bool is_likely_to_require_a_draw) override;
 271
 272   // ScrollbarAnimationControllerClient implementation.
 273   void StartAnimatingScrollbarAnimationController(
 274       ScrollbarAnimationController* controller) override;
 275   void StopAnimatingScrollbarAnimationController(
 276       ScrollbarAnimationController* controller) override;
 277   void PostDelayedScrollbarAnimationTask(const base::Closure& task,
 278                                          base::TimeDelta delay) override;
 279   void SetNeedsRedrawForScrollbarAnimation() override;
 280
 281   // OutputSurfaceClient implementation.
 282   void DeferredInitialize() override;
 283   void ReleaseGL() override;
 284   void CommitVSyncParameters(base::TimeTicks timebase,
 285                              base::TimeDelta interval) override;
 286   void SetNeedsRedrawRect(const gfx::Rect& rect) override;
 287   void SetExternalDrawConstraints(
 288       const gfx::Transform& transform,
 289       const gfx::Rect& viewport,
 290       const gfx::Rect& clip,
 291       const gfx::Rect& viewport_rect_for_tile_priority,
 292       const gfx::Transform& transform_for_tile_priority,
 293       bool resourceless_software_draw) override;
 294   void DidLoseOutputSurface() override;
 295   void DidSwapBuffers() override;
 296   void DidSwapBuffersComplete() override;
 297   void ReclaimResources(const CompositorFrameAck* ack) override;
 298   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
 299   void SetTreeActivationCallback(const base::Closure& callback) override;
 300   void OnDraw() override;
 301
 302   // Called from LayerTreeImpl.
 303   void OnCanDrawStateChangedForTree();
 304
 305   // Implementation.
 306   int id() const { return id_; }
 307   bool CanDraw() const;
 308   OutputSurface* output_surface() const { return output_surface_.get(); }
 309
 310   std::string LayerTreeAsJson() const;
 311
 312   void FinishAllRendering();
 313   int SourceAnimationFrameNumber() const;
 314
 315   virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
 316   TileManager* tile_manager() { return tile_manager_.get(); }
 317   void SetUseGpuRasterization(bool use_gpu);
 318   bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
 319
 320   GpuRasterizationStatus gpu_rasterization_status() const {
 321     return gpu_rasterization_status_;
 322   }
 323   void set_gpu_rasterization_status(
 324       GpuRasterizationStatus gpu_rasterization_status) {
 325     gpu_rasterization_status_ = gpu_rasterization_status;
 326   }
 327
 328   bool create_low_res_tiling() const {
 329     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
 330   }
 331   ResourcePool* resource_pool() { return resource_pool_.get(); }
 332   Renderer* renderer() { return renderer_.get(); }
 333   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
 334
 335   virtual bool SwapBuffers(const FrameData& frame);
 336   virtual void WillBeginImplFrame(const BeginFrameArgs& args);
 337   void DidModifyTilePriorities();
 338
 339   LayerTreeImpl* active_tree() { return active_tree_.get(); }
 340   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
 341   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
 342   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
 343   LayerTreeImpl* recycle_tree() { return recycle_tree_.get(); }
 344   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
 345   // Returns the tree LTH synchronizes with.
 346   LayerTreeImpl* sync_tree() {
 347     // TODO(enne): This is bogus.  It should return based on the value of
 348     // Proxy::CommitToActiveTree and not whether the pending tree exists.
 349     return pending_tree_ ? pending_tree_.get() : active_tree_.get();
 350   }
 351   virtual void CreatePendingTree();
 352   virtual void ActivateSyncTree();
 353
 354   // Shortcuts to layers on the active tree.
 355   LayerImpl* RootLayer() const;
 356   LayerImpl* InnerViewportScrollLayer() const;
 357   LayerImpl* OuterViewportScrollLayer() const;
 358   LayerImpl* CurrentlyScrollingLayer() const;
 359
 360   int scroll_layer_id_when_mouse_over_scrollbar() const {
 361     return scroll_layer_id_when_mouse_over_scrollbar_;
 362   }
 363   bool scroll_affects_scroll_handler() const {
 364     return scroll_affects_scroll_handler_;
 365   }
 366   void QueueSwapPromiseForMainThreadScrollUpdate(
 367       scoped_ptr<SwapPromise> swap_promise);
 368
 369   bool IsActivelyScrolling() const;
 370
 371   virtual void SetVisible(bool visible);
 372   bool visible() const { return visible_; }
 373
 374   bool AnimationsAreVisible() { return visible() && CanDraw(); }
 375
 376   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
 377   void SetNeedsRedraw();
 378
 379   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
 380
 381   size_t memory_allocation_limit_bytes() const;
 382   int memory_allocation_priority_cutoff() const;
 383
 384   void SetViewportSize(const gfx::Size& device_viewport_size);
 385   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 386
 387   void SetDeviceScaleFactor(float device_scale_factor);
 388   float device_scale_factor() const { return device_scale_factor_; }
 389
 390   void SetPageScaleOnActiveTree(float page_scale_factor);
 391
 392   const gfx::Transform& DrawTransform() const;
 393
 394   scoped_ptr<ScrollAndScaleSet> ProcessScrollDeltas();
 395
 396   void set_max_memory_needed_bytes(size_t bytes) {
 397     max_memory_needed_bytes_ = bytes;
 398   }
 399
 400   FrameRateCounter* fps_counter() {
 401     return fps_counter_.get();
 402   }
 403   PaintTimeCounter* paint_time_counter() {
 404     return paint_time_counter_.get();
 405   }
 406   MemoryHistory* memory_history() {
 407     return memory_history_.get();
 408   }
 409   DebugRectHistory* debug_rect_history() {
 410     return debug_rect_history_.get();
 411   }
 412   ResourceProvider* resource_provider() {
 413     return resource_provider_.get();
 414   }
 415   TopControlsManager* top_controls_manager() {
 416     return top_controls_manager_.get();
 417   }
 418   const GlobalStateThatImpactsTilePriority& global_tile_state() {
 419     return global_tile_state_;
 420   }
 421
 422   Proxy* proxy() const { return proxy_; }
 423
 424   AnimationRegistrar* animation_registrar() const {
 425     return animation_registrar_.get();
 426   }
 427
 428   void SetDebugState(const LayerTreeDebugState& new_debug_state);
 429   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 430
 431   class CC_EXPORT CullRenderPassesWithNoQuads {
 432    public:
 433     bool ShouldRemoveRenderPass(const RenderPassDrawQuad& quad,
 434                                 const FrameData& frame) const;
 435
 436     // Iterates in draw order, so that when a surface is removed, and its
 437     // target becomes empty, then its target can be removed also.
 438     size_t RenderPassListBegin(const RenderPassList& list) const { return 0; }
 439     size_t RenderPassListEnd(const RenderPassList& list) const {
 440       return list.size();
 441     }
 442     size_t RenderPassListNext(size_t it) const { return it + 1; }
 443   };
 444
 445   template <typename RenderPassCuller>
 446       static void RemoveRenderPasses(RenderPassCuller culler, FrameData* frame);
 447
 448   gfx::Vector2dF accumulated_root_overscroll() const {
 449     return accumulated_root_overscroll_;
 450   }
 451
 452   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 453
 454   void SetTreePriority(TreePriority priority);
 455   TreePriority GetTreePriority() const;
 456
 457   void UpdateCurrentBeginFrameArgs(const BeginFrameArgs& args);
 458   void ResetCurrentBeginFrameArgsForNextFrame();
 459   virtual BeginFrameArgs CurrentBeginFrameArgs() const;
 460
 461   // Expected time between two begin impl frame calls.
 462   base::TimeDelta begin_impl_frame_interval() const {
 463     return begin_impl_frame_interval_;
 464   }
 465
 466   void AsValueWithFrameInto(FrameData* frame,
 467                             base::trace_event::TracedValue* value) const;
 468   scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValueWithFrame(
 469       FrameData* frame) const;
 470   void ActivationStateAsValueInto(base::trace_event::TracedValue* value) const;
 471
 472   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 473
 474   virtual void CreateUIResource(UIResourceId uid,
 475                                 const UIResourceBitmap& bitmap);
 476   // Deletes a UI resource.  May safely be called more than once.
 477   virtual void DeleteUIResource(UIResourceId uid);
 478   void EvictAllUIResources();
 479   bool EvictedUIResourcesExist() const;
 480
 481   virtual ResourceProvider::ResourceId ResourceIdForUIResource(
 482       UIResourceId uid) const;
 483
 484   virtual bool IsUIResourceOpaque(UIResourceId uid) const;
 485
 486   struct UIResourceData {
 487     ResourceProvider::ResourceId resource_id;
 488     gfx::Size size;
 489     bool opaque;
 490   };
 491
 492   void ScheduleMicroBenchmark(scoped_ptr<MicroBenchmarkImpl> benchmark);
 493
 494   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
 495   // Viewport rectangle and clip in nonflipped window space.  These rects
 496   // should only be used by Renderer subclasses to populate glViewport/glClip
 497   // and their software-mode equivalents.
 498   gfx::Rect DeviceViewport() const;
 499   gfx::Rect DeviceClip() const;
 500
 501   // When a SwapPromiseMonitor is created on the impl thread, it calls
 502   // InsertSwapPromiseMonitor() to register itself with LayerTreeHostImpl.
 503   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 504   // to unregister itself.
 505   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 506   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 507
 508   void GetPictureLayerImplPairs(std::vector<PictureLayerImpl::Pair>* layers,
 509                                 bool need_valid_tile_priorities) const;
 510
 511   // TODO(weiliangc): Replace RequiresHighResToDraw with scheduler waits for
 512   // ReadyToDraw. crbug.com/469175
 513   void SetRequiresHighResToDraw() { requires_high_res_to_draw_ = true; }
 514   void ResetRequiresHighResToDraw() { requires_high_res_to_draw_ = false; }
 515   bool RequiresHighResToDraw() const { return requires_high_res_to_draw_; }
 516
 517   // Only valid for synchronous (non-scheduled) single-threaded case.
 518   void SynchronouslyInitializeAllTiles();
 519
 520   virtual void CreateResourceAndTileTaskWorkerPool(
 521       scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
 522       scoped_ptr<ResourcePool>* resource_pool,
 523       scoped_ptr<ResourcePool>* staging_resource_pool);
 524
 525   bool prepare_tiles_needed() const { return tile_priorities_dirty_; }
 526
 527   FrameTimingTracker* frame_timing_tracker() {
 528     return frame_timing_tracker_.get();
 529   }
 530
 531   gfx::Vector2dF ScrollLayer(LayerImpl* layer_impl,
 532                              const gfx::Vector2dF& delta,
 533                              const gfx::Point& viewport_point,
 534                              bool is_wheel_scroll);
 535
 536   // Record main frame timing information.
 537   // |start_of_main_frame_args| is the BeginFrameArgs of the beginning of the
 538   // main frame (ie the frame that kicked off the main frame).
 539   // |expected_next_main_frame_args| is the BeginFrameArgs of the frame that
 540   // follows the completion of the main frame (whether it is activation or some
 541   // other completion, such as early out). Note that if there is a main frame
 542   // scheduled in that frame, then this BeginFrameArgs will become the main
 543   // frame args. However, if no such frame is scheduled, then this _would_ be
 544   // the main frame args if it was scheduled.
 545   void RecordMainFrameTiming(
 546       const BeginFrameArgs& start_of_main_frame_args,
 547       const BeginFrameArgs& expected_next_main_frame_args);
 548
 549  protected:
 550   LayerTreeHostImpl(
 551       const LayerTreeSettings& settings,
 552       LayerTreeHostImplClient* client,
 553       Proxy* proxy,
 554       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 555       SharedBitmapManager* shared_bitmap_manager,
 556       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 557       TaskGraphRunner* task_graph_runner,
 558       int id);
 559
 560   // Virtual for testing.
 561   virtual void AnimateLayers(base::TimeTicks monotonic_time);
 562
 563   bool is_likely_to_require_a_draw() const {
 564     return is_likely_to_require_a_draw_;
 565   }
 566
 567   LayerTreeHostImplClient* client_;
 568   Proxy* proxy_;
 569
 570  private:
 571   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
 572       LayerImpl* layer_impl,
 573       const gfx::PointF& viewport_point,
 574       const gfx::Vector2dF& viewport_delta);
 575
 576   void CreateAndSetRenderer();
 577   void CreateAndSetTileManager();
 578   void DestroyTileManager();
 579   void ReleaseTreeResources();
 580   void RecreateTreeResources();
 581   void EnforceZeroBudget(bool zero_budget);
 582
 583   bool IsSynchronousSingleThreaded() const;
 584
 585   Viewport* viewport() { return viewport_.get(); }
 586
 587   // Scroll by preferring to move the outer viewport first, only moving the
 588   // inner if the outer is at its scroll extents.
 589   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
 590   // Scroll by preferring to move the inner viewport first, only moving the
 591   // outer if the inner is at its scroll extents.
 592   void ScrollViewportInnerFirst(gfx::Vector2dF scroll_delta);
 593   void AnimatePageScale(base::TimeTicks monotonic_time);
 594   void AnimateScrollbars(base::TimeTicks monotonic_time);
 595   void AnimateTopControls(base::TimeTicks monotonic_time);
 596
 597   void TrackDamageForAllSurfaces(
 598       LayerImpl* root_draw_layer,
 599       const LayerImplList& render_surface_layer_list);
 600
 601   void UpdateTileManagerMemoryPolicy(const ManagedMemoryPolicy& policy);
 602
 603   // This function should only be called from PrepareToDraw, as DidDrawAllLayers
 604   // must be called if this helper function is called.  Returns DRAW_SUCCESS if
 605   // the frame should be drawn.
 606   DrawResult CalculateRenderPasses(FrameData* frame);
 607
 608   void ClearCurrentlyScrollingLayer();
 609
 610   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
 611                                 const gfx::PointF& device_viewport_point);
 612
 613   LayerImpl* FindScrollLayerForDeviceViewportPoint(
 614       const gfx::PointF& device_viewport_point,
 615       InputHandler::ScrollInputType type,
 616       LayerImpl* layer_hit_by_point,
 617       bool* scroll_on_main_thread,
 618       bool* optional_has_ancestor_scroll_handler) const;
 619   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
 620                                    LayerImpl* layer_impl);
 621   void StartScrollbarFadeRecursive(LayerImpl* layer);
 622   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
 623                               bool zero_budget);
 624   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 625
 626   void MarkUIResourceNotEvicted(UIResourceId uid);
 627
 628   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
 629   void NotifySwapPromiseMonitorsOfForwardingToMainThread();
 630
 631   void ScrollAnimationCreate(LayerImpl* layer_impl,
 632                              const gfx::ScrollOffset& target_offset,
 633                              const gfx::ScrollOffset& current_offset);
 634   bool ScrollAnimationUpdateTarget(LayerImpl* layer_impl,
 635                                    const gfx::Vector2dF& scroll_delta);
 636
 637   typedef base::hash_map<UIResourceId, UIResourceData>
 638       UIResourceMap;
 639   UIResourceMap ui_resource_map_;
 640
 641   // Resources that were evicted by EvictAllUIResources. Resources are removed
 642   // from this when they are touched by a create or destroy from the UI resource
 643   // request queue.
 644   std::set<UIResourceId> evicted_ui_resources_;
 645
 646   scoped_ptr<OutputSurface> output_surface_;
 647
 648   // |resource_provider_| and |tile_manager_| can be NULL, e.g. when using tile-
 649   // free rendering - see OutputSurface::ForcedDrawToSoftwareDevice().
 650   // |tile_manager_| can also be NULL when raster_enabled is false.
 651   scoped_ptr<ResourceProvider> resource_provider_;
 652   scoped_ptr<TileManager> tile_manager_;
 653   bool use_gpu_rasterization_;
 654   GpuRasterizationStatus gpu_rasterization_status_;
 655   scoped_ptr<TileTaskWorkerPool> tile_task_worker_pool_;
 656   scoped_ptr<ResourcePool> resource_pool_;
 657   scoped_ptr<ResourcePool> staging_resource_pool_;
 658   scoped_ptr<Renderer> renderer_;
 659
 660   GlobalStateThatImpactsTilePriority global_tile_state_;
 661
 662   // Tree currently being drawn.
 663   scoped_ptr<LayerTreeImpl> active_tree_;
 664
 665   // In impl-side painting mode, tree with possibly incomplete rasterized
 666   // content. May be promoted to active by ActivatePendingTree().
 667   scoped_ptr<LayerTreeImpl> pending_tree_;
 668
 669   // In impl-side painting mode, inert tree with layers that can be recycled
 670   // by the next sync from the main thread.
 671   scoped_ptr<LayerTreeImpl> recycle_tree_;
 672
 673   InputHandlerClient* input_handler_client_;
 674   bool did_lock_scrolling_layer_;
 675   bool should_bubble_scrolls_;
 676   bool wheel_scrolling_;
 677   bool scroll_affects_scroll_handler_;
 678   int scroll_layer_id_when_mouse_over_scrollbar_;
 679   ScopedPtrVector<SwapPromise> swap_promises_for_main_thread_scroll_update_;
 680
 681   // An object to implement the ScrollElasticityHelper interface and
 682   // hold all state related to elasticity. May be NULL if never requested.
 683   scoped_ptr<ScrollElasticityHelper> scroll_elasticity_helper_;
 684
 685   bool tile_priorities_dirty_;
 686
 687   // The optional delegate for the root layer scroll offset.
 688   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 689   LayerTreeSettings settings_;
 690   LayerTreeDebugState debug_state_;
 691   bool visible_;
 692   ManagedMemoryPolicy cached_managed_memory_policy_;
 693
 694   gfx::Vector2dF accumulated_root_overscroll_;
 695
 696   bool pinch_gesture_active_;
 697   bool pinch_gesture_end_should_clear_scrolling_layer_;
 698   gfx::Point previous_pinch_anchor_;
 699
 700   scoped_ptr<TopControlsManager> top_controls_manager_;
 701
 702   scoped_ptr<PageScaleAnimation> page_scale_animation_;
 703
 704   scoped_ptr<FrameRateCounter> fps_counter_;
 705   scoped_ptr<PaintTimeCounter> paint_time_counter_;
 706   scoped_ptr<MemoryHistory> memory_history_;
 707   scoped_ptr<DebugRectHistory> debug_rect_history_;
 708
 709   scoped_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
 710
 711   // The maximum memory that would be used by the prioritized resource
 712   // manager, if there were no limit on memory usage.
 713   size_t max_memory_needed_bytes_;
 714
 715   bool zero_budget_;
 716
 717   // Viewport size passed in from the main thread, in physical pixels.  This
 718   // value is the default size for all concepts of physical viewport (draw
 719   // viewport, scrolling viewport and device viewport), but it can be
 720   // overridden.
 721   gfx::Size device_viewport_size_;
 722
 723   // Conversion factor from CSS pixels to physical pixels when
 724   // pageScaleFactor=1.
 725   float device_scale_factor_;
 726
 727   // Optional top-level constraints that can be set by the OutputSurface.
 728   // - external_transform_ applies a transform above the root layer
 729   // - external_viewport_ is used DrawProperties, tile management and
 730   // glViewport/window projection matrix.
 731   // - external_clip_ specifies a top-level clip rect
 732   // - viewport_rect_for_tile_priority_ is the rect in view space used for
 733   // tiling priority.
 734   gfx::Transform external_transform_;
 735   gfx::Rect external_viewport_;
 736   gfx::Rect external_clip_;
 737   gfx::Rect viewport_rect_for_tile_priority_;
 738   bool resourceless_software_draw_;
 739
 740   gfx::Rect viewport_damage_rect_;
 741
 742   BeginFrameArgs current_begin_frame_args_;
 743
 744   // Expected time between two begin impl frame calls.
 745   base::TimeDelta begin_impl_frame_interval_;
 746
 747   scoped_ptr<AnimationRegistrar> animation_registrar_;
 748   std::set<ScrollbarAnimationController*> scrollbar_animation_controllers_;
 749
 750   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 751   MicroBenchmarkControllerImpl micro_benchmark_controller_;
 752   scoped_ptr<TaskGraphRunner> single_thread_synchronous_task_graph_runner_;
 753
 754   // Optional callback to notify of new tree activations.
 755   base::Closure tree_activation_callback_;
 756
 757   SharedBitmapManager* shared_bitmap_manager_;
 758   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 759   TaskGraphRunner* task_graph_runner_;
 760   int id_;
 761
 762   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 763   std::vector<PictureLayerImpl::Pair> picture_layer_pairs_;
 764
 765   bool requires_high_res_to_draw_;
 766   bool is_likely_to_require_a_draw_;
 767
 768   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 769
 770   scoped_ptr<Viewport> viewport_;
 771
 772   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 773 };
 774
 775 }  // namespace cc
 776
 777 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_