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