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/ui_resource_client.h"
  35 #include "cc/scheduler/begin_frame_tracker.h"
  36 #include "cc/scheduler/commit_earlyout_reason.h"
  37 #include "cc/scheduler/draw_result.h"
  38 #include "cc/scheduler/video_frame_controller.h"
  39 #include "cc/tiles/tile_manager.h"
  40 #include "cc/trees/layer_tree_settings.h"
  41 #include "cc/trees/mutator_host_client.h"
  42 #include "cc/trees/proxy.h"
  43 #include "skia/ext/refptr.h"
  44 #include "third_party/skia/include/core/SkColor.h"
  45 #include "ui/gfx/geometry/rect.h"
  46
  47 namespace gfx {
  48 class ScrollOffset;
  49 }
  50
  51 namespace cc {
  52
  53 class AnimationHost;
  54 class CompletionEvent;
  55 class CompositorFrameMetadata;
  56 class DebugRectHistory;
  57 class EvictionTilePriorityQueue;
  58 class FrameRateCounter;
  59 class LayerImpl;
  60 class LayerTreeImpl;
  61 class MemoryHistory;
  62 class PageScaleAnimation;
  63 class PaintTimeCounter;
  64 class PictureLayerImpl;
  65 class RasterTilePriorityQueue;
  66 class TileTaskWorkerPool;
  67 class RenderPassDrawQuad;
  68 class RenderingStatsInstrumentation;
  69 class ResourcePool;
  70 class ScrollElasticityHelper;
  71 class ScrollbarLayerImplBase;
  72 class SwapPromise;
  73 class SwapPromiseMonitor;
  74 class TextureMailboxDeleter;
  75 class TopControlsManager;
  76 class UIResourceBitmap;
  77 class UIResourceRequest;
  78 struct ScrollAndScaleSet;
  79 class Viewport;
  80
  81 enum class GpuRasterizationStatus {
  82   ON,
  83   ON_FORCED,
  84   OFF_DEVICE,
  85   OFF_VIEWPORT,
  86   MSAA_CONTENT,
  87   OFF_CONTENT
  88 };
  89
  90 // LayerTreeHost->Proxy callback interface.
  91 class LayerTreeHostImplClient {
  92  public:
  93   virtual void UpdateRendererCapabilitiesOnImplThread() = 0;
  94   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
  95   virtual void CommitVSyncParameters(base::TimeTicks timebase,
  96                                      base::TimeDelta interval) = 0;
  97   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) = 0;
  98   virtual void SetMaxSwapsPendingOnImplThread(int max) = 0;
  99   virtual void DidSwapBuffersOnImplThread() = 0;
 100   virtual void DidSwapBuffersCompleteOnImplThread() = 0;
 101   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
 102   virtual void NotifyReadyToActivate() = 0;
 103   virtual void NotifyReadyToDraw() = 0;
 104   // Please call these 3 functions through
 105   // LayerTreeHostImpl's SetNeedsRedraw(), SetNeedsRedrawRect() and
 106   // SetNeedsAnimate().
 107   virtual void SetNeedsRedrawOnImplThread() = 0;
 108   virtual void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) = 0;
 109   virtual void SetNeedsAnimateOnImplThread() = 0;
 110   virtual void SetNeedsCommitOnImplThread() = 0;
 111   virtual void SetNeedsPrepareTilesOnImplThread() = 0;
 112   virtual void SetVideoNeedsBeginFrames(bool needs_begin_frames) = 0;
 113   virtual void PostAnimationEventsToMainThreadOnImplThread(
 114       scoped_ptr<AnimationEventsVector> events) = 0;
 115   virtual bool IsInsideDraw() = 0;
 116   virtual void RenewTreePriority() = 0;
 117   virtual void PostDelayedAnimationTaskOnImplThread(const base::Closure& task,
 118                                                     base::TimeDelta delay) = 0;
 119   virtual void DidActivateSyncTree() = 0;
 120   virtual void WillPrepareTiles() = 0;
 121   virtual void DidPrepareTiles() = 0;
 122
 123   // Called when page scale animation has completed on the impl thread.
 124   virtual void DidCompletePageScaleAnimationOnImplThread() = 0;
 125
 126   // Called when output surface asks for a draw.
 127   virtual void OnDrawForOutputSurface() = 0;
 128
 129   virtual void PostFrameTimingEventsOnImplThread(
 130       scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
 131       scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) = 0;
 132
 133  protected:
 134   virtual ~LayerTreeHostImplClient() {}
 135 };
 136
 137 // LayerTreeHostImpl owns the LayerImpl trees as well as associated rendering
 138 // state.
 139 class CC_EXPORT LayerTreeHostImpl
 140     : public InputHandler,
 141       public RendererClient,
 142       public TileManagerClient,
 143       public OutputSurfaceClient,
 144       public TopControlsManagerClient,
 145       public ScrollbarAnimationControllerClient,
 146       public VideoFrameControllerClient,
 147       public MutatorHostClient,
 148       public base::SupportsWeakPtr<LayerTreeHostImpl> {
 149  public:
 150   static scoped_ptr<LayerTreeHostImpl> Create(
 151       const LayerTreeSettings& settings,
 152       LayerTreeHostImplClient* client,
 153       Proxy* proxy,
 154       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 155       SharedBitmapManager* shared_bitmap_manager,
 156       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 157       TaskGraphRunner* task_graph_runner,
 158       int id);
 159   ~LayerTreeHostImpl() override;
 160
 161   // InputHandler implementation
 162   void BindToClient(InputHandlerClient* client) override;
 163   InputHandler::ScrollStatus ScrollBegin(
 164       const gfx::Point& viewport_point,
 165       InputHandler::ScrollInputType type) override;
 166   InputHandler::ScrollStatus RootScrollBegin(
 167       InputHandler::ScrollInputType type) override;
 168   InputHandler::ScrollStatus ScrollAnimated(
 169       const gfx::Point& viewport_point,
 170       const gfx::Vector2dF& scroll_delta) override;
 171   void ApplyScroll(LayerImpl* layer, ScrollState* scroll_state);
 172   InputHandlerScrollResult ScrollBy(
 173       const gfx::Point& viewport_point,
 174       const gfx::Vector2dF& scroll_delta) override;
 175   bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
 176                               ScrollDirection direction) override;
 177   void SetRootLayerScrollOffsetDelegate(
 178       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) override;
 179   void OnRootLayerDelegatedScrollOffsetChanged(
 180       const gfx::ScrollOffset& root_offset) override;
 181   void ScrollEnd() override;
 182   InputHandler::ScrollStatus FlingScrollBegin() override;
 183   void MouseMoveAt(const gfx::Point& viewport_point) override;
 184   void PinchGestureBegin() override;
 185   void PinchGestureUpdate(float magnify_delta,
 186                           const gfx::Point& anchor) override;
 187   void PinchGestureEnd() override;
 188   void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 189                                bool anchor_point,
 190                                float page_scale,
 191                                base::TimeDelta duration);
 192   void SetNeedsAnimateInput() override;
 193   bool IsCurrentlyScrollingRoot() const override;
 194   bool IsCurrentlyScrollingLayerAt(
 195       const gfx::Point& viewport_point,
 196       InputHandler::ScrollInputType type) const override;
 197   bool HaveWheelEventHandlersAt(const gfx::Point& viewport_point) override;
 198   bool DoTouchEventsBlockScrollAt(const gfx::Point& viewport_port) override;
 199   scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
 200       ui::LatencyInfo* latency) override;
 201   ScrollElasticityHelper* CreateScrollElasticityHelper() override;
 202
 203   // TopControlsManagerClient implementation.
 204   float TopControlsHeight() const override;
 205   void SetCurrentTopControlsShownRatio(float offset) override;
 206   float CurrentTopControlsShownRatio() const override;
 207   void DidChangeTopControlsPosition() override;
 208   bool HaveRootScrollLayer() const override;
 209
 210   void UpdateViewportContainerSizes();
 211
 212   struct CC_EXPORT FrameData : public RenderPassSink {
 213     FrameData();
 214     ~FrameData() override;
 215     void AsValueInto(base::trace_event::TracedValue* value) const;
 216
 217     std::vector<gfx::Rect> occluding_screen_space_rects;
 218     std::vector<gfx::Rect> non_occluding_screen_space_rects;
 219     std::vector<FrameTimingTracker::FrameAndRectIds> composite_events;
 220     RenderPassList render_passes;
 221     RenderPassIdHashMap render_passes_by_id;
 222     const LayerImplList* render_surface_layer_list;
 223     LayerImplList will_draw_layers;
 224     bool has_no_damage;
 225
 226     // RenderPassSink implementation.
 227     void AppendRenderPass(scoped_ptr<RenderPass> render_pass) override;
 228   };
 229
 230   virtual void BeginMainFrameAborted(CommitEarlyOutReason reason);
 231   virtual void BeginCommit();
 232   virtual void CommitComplete();
 233   virtual void Animate();
 234   virtual void UpdateAnimationState(bool start_ready_animations);
 235   void ActivateAnimations();
 236   void MainThreadHasStoppedFlinging();
 237   void DidAnimateScrollOffset();
 238   void SetViewportDamage(const gfx::Rect& damage_rect);
 239
 240   void SetTreeLayerFilterMutated(int layer_id,
 241                                  LayerTreeImpl* tree,
 242                                  const FilterOperations& filters);
 243   void SetTreeLayerOpacityMutated(int layer_id,
 244                                   LayerTreeImpl* tree,
 245                                   float opacity);
 246   void SetTreeLayerTransformMutated(int layer_id,
 247                                     LayerTreeImpl* tree,
 248                                     const gfx::Transform& transform);
 249   void SetTreeLayerScrollOffsetMutated(int layer_id,
 250                                        LayerTreeImpl* tree,
 251                                        const gfx::ScrollOffset& scroll_offset);
 252   void TreeLayerTransformIsPotentiallyAnimatingChanged(int layer_id,
 253                                                        LayerTreeImpl* tree,
 254                                                        bool is_animating);
 255
 256   // LayerTreeMutatorsClient implementation.
 257   bool IsLayerInTree(int layer_id, LayerTreeType tree_type) const override;
 258   void SetMutatorsNeedCommit() override;
 259   void SetLayerFilterMutated(int layer_id,
 260                              LayerTreeType tree_type,
 261                              const FilterOperations& filters) override;
 262   void SetLayerOpacityMutated(int layer_id,
 263                               LayerTreeType tree_type,
 264                               float opacity) override;
 265   void SetLayerTransformMutated(int layer_id,
 266                                 LayerTreeType tree_type,
 267                                 const gfx::Transform& transform) override;
 268   void SetLayerScrollOffsetMutated(
 269       int layer_id,
 270       LayerTreeType tree_type,
 271       const gfx::ScrollOffset& scroll_offset) override;
 272   void LayerTransformIsPotentiallyAnimatingChanged(int layer_id,
 273                                                    LayerTreeType tree_type,
 274                                                    bool is_animating) override;
 275   void ScrollOffsetAnimationFinished() override;
 276   gfx::ScrollOffset GetScrollOffsetForAnimation(int layer_id) const override;
 277
 278   virtual bool PrepareTiles();
 279
 280   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
 281   // should try to avoid displaying the frame. If PrepareToDraw is called,
 282   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
 283   // called between the two.
 284   virtual DrawResult PrepareToDraw(FrameData* frame);
 285   virtual void DrawLayers(FrameData* frame);
 286   // Must be called if and only if PrepareToDraw was called.
 287   void DidDrawAllLayers(const FrameData& frame);
 288
 289   const LayerTreeSettings& settings() const { return settings_; }
 290
 291   // Evict all textures by enforcing a memory policy with an allocation of 0.
 292   void EvictTexturesForTesting();
 293
 294   // When blocking, this prevents client_->NotifyReadyToActivate() from being
 295   // called. When disabled, it calls client_->NotifyReadyToActivate()
 296   // immediately if any notifications had been blocked while blocking.
 297   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 298
 299   // Resets all of the trees to an empty state.
 300   void ResetTreesForTesting();
 301
 302   size_t SourceAnimationFrameNumberForTesting() const;
 303
 304   DrawMode GetDrawMode() const;
 305
 306   // Viewport size in draw space: this size is in physical pixels and is used
 307   // for draw properties, tilings, quads and render passes.
 308   gfx::Size DrawViewportSize() const;
 309
 310   // Viewport rect in view space used for tiling prioritization.
 311   const gfx::Rect ViewportRectForTilePriority() const;
 312
 313   // RendererClient implementation.
 314   void SetFullRootLayerDamage() override;
 315
 316   // TileManagerClient implementation.
 317   void NotifyReadyToActivate() override;
 318   void NotifyReadyToDraw() override;
 319   void NotifyAllTileTasksCompleted() override;
 320   void NotifyTileStateChanged(const Tile* tile) override;
 321   scoped_ptr<RasterTilePriorityQueue> BuildRasterQueue(
 322       TreePriority tree_priority,
 323       RasterTilePriorityQueue::Type type) override;
 324   scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
 325       TreePriority tree_priority) override;
 326   void SetIsLikelyToRequireADraw(bool is_likely_to_require_a_draw) override;
 327
 328   // ScrollbarAnimationControllerClient implementation.
 329   void StartAnimatingScrollbarAnimationController(
 330       ScrollbarAnimationController* controller) override;
 331   void StopAnimatingScrollbarAnimationController(
 332       ScrollbarAnimationController* controller) override;
 333   void PostDelayedScrollbarAnimationTask(const base::Closure& task,
 334                                          base::TimeDelta delay) override;
 335   void SetNeedsRedrawForScrollbarAnimation() override;
 336
 337   // VideoBeginFrameSource implementation.
 338   void AddVideoFrameController(VideoFrameController* controller) override;
 339   void RemoveVideoFrameController(VideoFrameController* controller) override;
 340
 341   // OutputSurfaceClient implementation.
 342   void CommitVSyncParameters(base::TimeTicks timebase,
 343                              base::TimeDelta interval) override;
 344   void SetNeedsRedrawRect(const gfx::Rect& rect) override;
 345   void SetExternalDrawConstraints(
 346       const gfx::Transform& transform,
 347       const gfx::Rect& viewport,
 348       const gfx::Rect& clip,
 349       const gfx::Rect& viewport_rect_for_tile_priority,
 350       const gfx::Transform& transform_for_tile_priority,
 351       bool resourceless_software_draw) override;
 352   void DidLoseOutputSurface() override;
 353   void DidSwapBuffers() override;
 354   void DidSwapBuffersComplete() override;
 355   void ReclaimResources(const CompositorFrameAck* ack) override;
 356   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
 357   void SetTreeActivationCallback(const base::Closure& callback) override;
 358   void OnDraw() override;
 359
 360   // Called from LayerTreeImpl.
 361   void OnCanDrawStateChangedForTree();
 362
 363   // Implementation.
 364   int id() const { return id_; }
 365   bool CanDraw() const;
 366   OutputSurface* output_surface() const { return output_surface_.get(); }
 367
 368   std::string LayerTreeAsJson() const;
 369
 370   void FinishAllRendering();
 371   int RequestedMSAASampleCount() const;
 372
 373   virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
 374   TileManager* tile_manager() { return tile_manager_.get(); }
 375
 376   void SetHasGpuRasterizationTrigger(bool flag) {
 377     has_gpu_rasterization_trigger_ = flag;
 378     UpdateGpuRasterizationStatus();
 379   }
 380   void SetContentIsSuitableForGpuRasterization(bool flag) {
 381     content_is_suitable_for_gpu_rasterization_ = flag;
 382     UpdateGpuRasterizationStatus();
 383   }
 384   bool CanUseGpuRasterization();
 385   void UpdateTreeResourcesForGpuRasterizationIfNeeded();
 386   bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
 387   bool use_msaa() const { return use_msaa_; }
 388
 389   GpuRasterizationStatus gpu_rasterization_status() const {
 390     return gpu_rasterization_status_;
 391   }
 392
 393   bool create_low_res_tiling() const {
 394     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
 395   }
 396   ResourcePool* resource_pool() { return resource_pool_.get(); }
 397   Renderer* renderer() { return renderer_.get(); }
 398   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
 399
 400   virtual bool SwapBuffers(const FrameData& frame);
 401   virtual void WillBeginImplFrame(const BeginFrameArgs& args);
 402   virtual void DidFinishImplFrame();
 403   void DidModifyTilePriorities();
 404
 405   LayerTreeImpl* active_tree() { return active_tree_.get(); }
 406   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
 407   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
 408   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
 409   LayerTreeImpl* recycle_tree() { return recycle_tree_.get(); }
 410   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
 411   // Returns the tree LTH synchronizes with.
 412   LayerTreeImpl* sync_tree() {
 413     // TODO(enne): This is bogus.  It should return based on the value of
 414     // Proxy::CommitToActiveTree and not whether the pending tree exists.
 415     return pending_tree_ ? pending_tree_.get() : active_tree_.get();
 416   }
 417   virtual void CreatePendingTree();
 418   virtual void ActivateSyncTree();
 419
 420   // Shortcuts to layers on the active tree.
 421   LayerImpl* RootLayer() const;
 422   LayerImpl* InnerViewportScrollLayer() const;
 423   LayerImpl* OuterViewportScrollLayer() const;
 424   LayerImpl* CurrentlyScrollingLayer() const;
 425
 426   int scroll_layer_id_when_mouse_over_scrollbar() const {
 427     return scroll_layer_id_when_mouse_over_scrollbar_;
 428   }
 429   bool scroll_affects_scroll_handler() const {
 430     return scroll_affects_scroll_handler_;
 431   }
 432   void QueueSwapPromiseForMainThreadScrollUpdate(
 433       scoped_ptr<SwapPromise> swap_promise);
 434
 435   bool IsActivelyScrolling() const;
 436
 437   virtual void SetVisible(bool visible);
 438   bool visible() const { return visible_; }
 439
 440   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
 441   void SetNeedsAnimate();
 442   void SetNeedsRedraw();
 443
 444   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
 445
 446   size_t memory_allocation_limit_bytes() const;
 447
 448   void SetViewportSize(const gfx::Size& device_viewport_size);
 449   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 450
 451   void SetDeviceScaleFactor(float device_scale_factor);
 452   float device_scale_factor() const { return device_scale_factor_; }
 453
 454   void SetPageScaleOnActiveTree(float page_scale_factor);
 455
 456   const gfx::Transform& DrawTransform() const;
 457
 458   scoped_ptr<ScrollAndScaleSet> ProcessScrollDeltas();
 459
 460   void set_max_memory_needed_bytes(size_t bytes) {
 461     max_memory_needed_bytes_ = bytes;
 462   }
 463
 464   FrameRateCounter* fps_counter() {
 465     return fps_counter_.get();
 466   }
 467   PaintTimeCounter* paint_time_counter() {
 468     return paint_time_counter_.get();
 469   }
 470   MemoryHistory* memory_history() {
 471     return memory_history_.get();
 472   }
 473   DebugRectHistory* debug_rect_history() {
 474     return debug_rect_history_.get();
 475   }
 476   ResourceProvider* resource_provider() {
 477     return resource_provider_.get();
 478   }
 479   TopControlsManager* top_controls_manager() {
 480     return top_controls_manager_.get();
 481   }
 482   const GlobalStateThatImpactsTilePriority& global_tile_state() {
 483     return global_tile_state_;
 484   }
 485
 486   Proxy* proxy() const { return proxy_; }
 487
 488   AnimationRegistrar* animation_registrar() const {
 489     return animation_registrar_.get();
 490   }
 491   AnimationHost* animation_host() const { return animation_host_.get(); }
 492
 493   void SetDebugState(const LayerTreeDebugState& new_debug_state);
 494   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 495
 496   gfx::Vector2dF accumulated_root_overscroll() const {
 497     return accumulated_root_overscroll_;
 498   }
 499
 500   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 501
 502   void SetTreePriority(TreePriority priority);
 503   TreePriority GetTreePriority() const;
 504
 505   // TODO(mithro): Remove this methods which exposes the internal
 506   // BeginFrameArgs to external callers.
 507   virtual BeginFrameArgs CurrentBeginFrameArgs() const;
 508
 509   // Expected time between two begin impl frame calls.
 510   base::TimeDelta CurrentBeginFrameInterval() const;
 511
 512   void AsValueWithFrameInto(FrameData* frame,
 513                             base::trace_event::TracedValue* value) const;
 514   scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValueWithFrame(
 515       FrameData* frame) const;
 516   void ActivationStateAsValueInto(base::trace_event::TracedValue* value) const;
 517
 518   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 519
 520   virtual void CreateUIResource(UIResourceId uid,
 521                                 const UIResourceBitmap& bitmap);
 522   // Deletes a UI resource.  May safely be called more than once.
 523   virtual void DeleteUIResource(UIResourceId uid);
 524   void EvictAllUIResources();
 525   bool EvictedUIResourcesExist() const;
 526
 527   virtual ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 528
 529   virtual bool IsUIResourceOpaque(UIResourceId uid) const;
 530
 531   struct UIResourceData {
 532     ResourceId resource_id;
 533     gfx::Size size;
 534     bool opaque;
 535   };
 536
 537   void ScheduleMicroBenchmark(scoped_ptr<MicroBenchmarkImpl> benchmark);
 538
 539   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
 540   // Viewport rectangle and clip in nonflipped window space.  These rects
 541   // should only be used by Renderer subclasses to populate glViewport/glClip
 542   // and their software-mode equivalents.
 543   gfx::Rect DeviceViewport() const;
 544   gfx::Rect DeviceClip() const;
 545
 546   // When a SwapPromiseMonitor is created on the impl thread, it calls
 547   // InsertSwapPromiseMonitor() to register itself with LayerTreeHostImpl.
 548   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 549   // to unregister itself.
 550   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 551   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 552
 553   // TODO(weiliangc): Replace RequiresHighResToDraw with scheduler waits for
 554   // ReadyToDraw. crbug.com/469175
 555   void SetRequiresHighResToDraw() { requires_high_res_to_draw_ = true; }
 556   void ResetRequiresHighResToDraw() { requires_high_res_to_draw_ = false; }
 557   bool RequiresHighResToDraw() const { return requires_high_res_to_draw_; }
 558
 559   // Only valid for synchronous (non-scheduled) single-threaded case.
 560   void SynchronouslyInitializeAllTiles();
 561
 562   virtual void CreateResourceAndTileTaskWorkerPool(
 563       scoped_ptr<TileTaskWorkerPool>* tile_task_worker_pool,
 564       scoped_ptr<ResourcePool>* resource_pool);
 565
 566   bool prepare_tiles_needed() const { return tile_priorities_dirty_; }
 567
 568   FrameTimingTracker* frame_timing_tracker() {
 569     return frame_timing_tracker_.get();
 570   }
 571
 572   gfx::Vector2dF ScrollLayer(LayerImpl* layer_impl,
 573                              const gfx::Vector2dF& delta,
 574                              const gfx::Point& viewport_point,
 575                              bool is_direct_manipulation);
 576
 577   // Record main frame timing information.
 578   // |start_of_main_frame_args| is the BeginFrameArgs of the beginning of the
 579   // main frame (ie the frame that kicked off the main frame).
 580   // |expected_next_main_frame_args| is the BeginFrameArgs of the frame that
 581   // follows the completion of the main frame (whether it is activation or some
 582   // other completion, such as early out). Note that if there is a main frame
 583   // scheduled in that frame, then this BeginFrameArgs will become the main
 584   // frame args. However, if no such frame is scheduled, then this _would_ be
 585   // the main frame args if it was scheduled.
 586   void RecordMainFrameTiming(
 587       const BeginFrameArgs& start_of_main_frame_args,
 588       const BeginFrameArgs& expected_next_main_frame_args);
 589
 590   // Post the given frame timing events to the requester.
 591   void PostFrameTimingEvents(
 592       scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
 593       scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events);
 594
 595  protected:
 596   LayerTreeHostImpl(
 597       const LayerTreeSettings& settings,
 598       LayerTreeHostImplClient* client,
 599       Proxy* proxy,
 600       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 601       SharedBitmapManager* shared_bitmap_manager,
 602       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 603       TaskGraphRunner* task_graph_runner,
 604       int id);
 605
 606   // Virtual for testing.
 607   virtual void AnimateLayers(base::TimeTicks monotonic_time);
 608
 609   bool is_likely_to_require_a_draw() const {
 610     return is_likely_to_require_a_draw_;
 611   }
 612
 613   // Removes empty or orphan RenderPasses from the frame.
 614   static void RemoveRenderPasses(FrameData* frame);
 615
 616   LayerTreeHostImplClient* client_;
 617   Proxy* proxy_;
 618
 619   BeginFrameTracker current_begin_frame_tracker_;
 620
 621  private:
 622   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
 623       LayerImpl* layer_impl,
 624       const gfx::PointF& viewport_point,
 625       const gfx::Vector2dF& viewport_delta);
 626
 627   void CreateAndSetRenderer();
 628   void CleanUpTileManager();
 629   void CreateTileManagerResources();
 630   void ReleaseTreeResources();
 631   void RecreateTreeResources();
 632
 633   void UpdateGpuRasterizationStatus();
 634
 635   Viewport* viewport() { return viewport_.get(); }
 636
 637   // Scroll by preferring to move the outer viewport first, only moving the
 638   // inner if the outer is at its scroll extents.
 639   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
 640   // Scroll by preferring to move the inner viewport first, only moving the
 641   // outer if the inner is at its scroll extents.
 642   void ScrollViewportInnerFirst(gfx::Vector2dF scroll_delta);
 643
 644   InputHandler::ScrollStatus ScrollBeginImpl(
 645       LayerImpl* scrolling_layer_impl,
 646       InputHandler::ScrollInputType type);
 647
 648   void AnimatePageScale(base::TimeTicks monotonic_time);
 649   void AnimateScrollbars(base::TimeTicks monotonic_time);
 650   void AnimateTopControls(base::TimeTicks monotonic_time);
 651
 652   void TrackDamageForAllSurfaces(
 653       LayerImpl* root_draw_layer,
 654       const LayerImplList& render_surface_layer_list);
 655
 656   void UpdateTileManagerMemoryPolicy(const ManagedMemoryPolicy& policy);
 657
 658   // This function should only be called from PrepareToDraw, as DidDrawAllLayers
 659   // must be called if this helper function is called.  Returns DRAW_SUCCESS if
 660   // the frame should be drawn.
 661   DrawResult CalculateRenderPasses(FrameData* frame);
 662
 663   void ClearCurrentlyScrollingLayer();
 664
 665   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
 666                                 const gfx::PointF& device_viewport_point);
 667
 668   LayerImpl* FindScrollLayerForDeviceViewportPoint(
 669       const gfx::PointF& device_viewport_point,
 670       InputHandler::ScrollInputType type,
 671       LayerImpl* layer_hit_by_point,
 672       bool* scroll_on_main_thread,
 673       bool* optional_has_ancestor_scroll_handler) const;
 674   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
 675                                    LayerImpl* layer_impl);
 676   void StartScrollbarFadeRecursive(LayerImpl* layer);
 677   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 678
 679   void MarkUIResourceNotEvicted(UIResourceId uid);
 680
 681   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
 682   void NotifySwapPromiseMonitorsOfForwardingToMainThread();
 683
 684   void ScrollAnimationCreate(LayerImpl* layer_impl,
 685                              const gfx::ScrollOffset& target_offset,
 686                              const gfx::ScrollOffset& current_offset);
 687   bool ScrollAnimationUpdateTarget(LayerImpl* layer_impl,
 688                                    const gfx::Vector2dF& scroll_delta);
 689
 690   base::SingleThreadTaskRunner* GetTaskRunner() const {
 691     DCHECK(proxy_);
 692     return proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
 693                                    : proxy_->MainThreadTaskRunner();
 694   }
 695
 696   typedef base::hash_map<UIResourceId, UIResourceData>
 697       UIResourceMap;
 698   UIResourceMap ui_resource_map_;
 699
 700   // Resources that were evicted by EvictAllUIResources. Resources are removed
 701   // from this when they are touched by a create or destroy from the UI resource
 702   // request queue.
 703   std::set<UIResourceId> evicted_ui_resources_;
 704
 705   scoped_ptr<OutputSurface> output_surface_;
 706
 707   scoped_ptr<ResourceProvider> resource_provider_;
 708   bool content_is_suitable_for_gpu_rasterization_;
 709   bool has_gpu_rasterization_trigger_;
 710   bool use_gpu_rasterization_;
 711   bool use_msaa_;
 712   GpuRasterizationStatus gpu_rasterization_status_;
 713   bool tree_resources_for_gpu_rasterization_dirty_;
 714   scoped_ptr<TileTaskWorkerPool> tile_task_worker_pool_;
 715   scoped_ptr<ResourcePool> resource_pool_;
 716   scoped_ptr<Renderer> renderer_;
 717
 718   GlobalStateThatImpactsTilePriority global_tile_state_;
 719
 720   // Tree currently being drawn.
 721   scoped_ptr<LayerTreeImpl> active_tree_;
 722
 723   // In impl-side painting mode, tree with possibly incomplete rasterized
 724   // content. May be promoted to active by ActivatePendingTree().
 725   scoped_ptr<LayerTreeImpl> pending_tree_;
 726
 727   // In impl-side painting mode, inert tree with layers that can be recycled
 728   // by the next sync from the main thread.
 729   scoped_ptr<LayerTreeImpl> recycle_tree_;
 730
 731   InputHandlerClient* input_handler_client_;
 732   bool did_lock_scrolling_layer_;
 733   bool should_bubble_scrolls_;
 734   bool wheel_scrolling_;
 735   bool scroll_affects_scroll_handler_;
 736   int scroll_layer_id_when_mouse_over_scrollbar_;
 737   ScopedPtrVector<SwapPromise> swap_promises_for_main_thread_scroll_update_;
 738
 739   // An object to implement the ScrollElasticityHelper interface and
 740   // hold all state related to elasticity. May be NULL if never requested.
 741   scoped_ptr<ScrollElasticityHelper> scroll_elasticity_helper_;
 742
 743   bool tile_priorities_dirty_;
 744
 745   // The optional delegate for the root layer scroll offset.
 746   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 747
 748   const LayerTreeSettings settings_;
 749   LayerTreeDebugState debug_state_;
 750   bool visible_;
 751   ManagedMemoryPolicy cached_managed_memory_policy_;
 752
 753   const bool is_synchronous_single_threaded_;
 754   scoped_ptr<TileManager> tile_manager_;
 755
 756   gfx::Vector2dF accumulated_root_overscroll_;
 757
 758   bool pinch_gesture_active_;
 759   bool pinch_gesture_end_should_clear_scrolling_layer_;
 760
 761   scoped_ptr<TopControlsManager> top_controls_manager_;
 762
 763   scoped_ptr<PageScaleAnimation> page_scale_animation_;
 764
 765   scoped_ptr<FrameRateCounter> fps_counter_;
 766   scoped_ptr<PaintTimeCounter> paint_time_counter_;
 767   scoped_ptr<MemoryHistory> memory_history_;
 768   scoped_ptr<DebugRectHistory> debug_rect_history_;
 769
 770   scoped_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
 771
 772   // The maximum memory that would be used by the prioritized resource
 773   // manager, if there were no limit on memory usage.
 774   size_t max_memory_needed_bytes_;
 775
 776   // Viewport size passed in from the main thread, in physical pixels.  This
 777   // value is the default size for all concepts of physical viewport (draw
 778   // viewport, scrolling viewport and device viewport), but it can be
 779   // overridden.
 780   gfx::Size device_viewport_size_;
 781
 782   // Conversion factor from CSS pixels to physical pixels when
 783   // pageScaleFactor=1.
 784   float device_scale_factor_;
 785
 786   // Optional top-level constraints that can be set by the OutputSurface.
 787   // - external_transform_ applies a transform above the root layer
 788   // - external_viewport_ is used DrawProperties, tile management and
 789   // glViewport/window projection matrix.
 790   // - external_clip_ specifies a top-level clip rect
 791   // - viewport_rect_for_tile_priority_ is the rect in view space used for
 792   // tiling priority.
 793   gfx::Transform external_transform_;
 794   gfx::Rect external_viewport_;
 795   gfx::Rect external_clip_;
 796   gfx::Rect viewport_rect_for_tile_priority_;
 797   bool resourceless_software_draw_;
 798
 799   gfx::Rect viewport_damage_rect_;
 800
 801   scoped_ptr<AnimationRegistrar> animation_registrar_;
 802   scoped_ptr<AnimationHost> animation_host_;
 803   std::set<ScrollbarAnimationController*> scrollbar_animation_controllers_;
 804   std::set<VideoFrameController*> video_frame_controllers_;
 805
 806   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 807   MicroBenchmarkControllerImpl micro_benchmark_controller_;
 808   scoped_ptr<TaskGraphRunner> single_thread_synchronous_task_graph_runner_;
 809
 810   // Optional callback to notify of new tree activations.
 811   base::Closure tree_activation_callback_;
 812
 813   SharedBitmapManager* shared_bitmap_manager_;
 814   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 815   TaskGraphRunner* task_graph_runner_;
 816   int id_;
 817
 818   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 819
 820   bool requires_high_res_to_draw_;
 821   bool is_likely_to_require_a_draw_;
 822
 823   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 824
 825   scoped_ptr<Viewport> viewport_;
 826
 827   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 828 };
 829
 830 }  // namespace cc
 831
 832 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_