cc/trees/layer_tree_host_impl.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TREES_LAYER_TREE_HOST_IMPL_H_
   6 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
   7
   8 #include <list>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/containers/hash_tables.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/time/time.h"
  17 #include "cc/animation/animation_events.h"
  18 #include "cc/animation/animation_registrar.h"
  19 #include "cc/animation/scrollbar_animation_controller.h"
  20 #include "cc/base/cc_export.h"
  21 #include "cc/debug/micro_benchmark_controller_impl.h"
  22 #include "cc/input/input_handler.h"
  23 #include "cc/input/layer_scroll_offset_delegate.h"
  24 #include "cc/input/top_controls_manager_client.h"
  25 #include "cc/layers/layer_lists.h"
  26 #include "cc/layers/render_pass_sink.h"
  27 #include "cc/output/begin_frame_args.h"
  28 #include "cc/output/managed_memory_policy.h"
  29 #include "cc/output/output_surface_client.h"
  30 #include "cc/output/renderer.h"
  31 #include "cc/quads/render_pass.h"
  32 #include "cc/resources/resource_provider.h"
  33 #include "cc/resources/tile_manager.h"
  34 #include "cc/scheduler/begin_frame_source.h"
  35 #include "cc/scheduler/draw_result.h"
  36 #include "skia/ext/refptr.h"
  37 #include "third_party/skia/include/core/SkColor.h"
  38 #include "ui/gfx/geometry/rect.h"
  39
  40 namespace cc {
  41
  42 class CompletionEvent;
  43 class CompositorFrameMetadata;
  44 class DebugRectHistory;
  45 class EvictionTilePriorityQueue;
  46 class FrameRateCounter;
  47 class LayerImpl;
  48 class LayerTreeHostImplTimeSourceAdapter;
  49 class LayerTreeImpl;
  50 class MemoryHistory;
  51 class PageScaleAnimation;
  52 class PaintTimeCounter;
  53 class PictureLayerImpl;
  54 class RasterTilePriorityQueue;
  55 class RasterWorkerPool;
  56 class RenderPassDrawQuad;
  57 class RenderingStatsInstrumentation;
  58 class ResourcePool;
  59 class ScrollbarLayerImplBase;
  60 class TextureMailboxDeleter;
  61 class TopControlsManager;
  62 class UIResourceBitmap;
  63 class UIResourceRequest;
  64 struct RendererCapabilitiesImpl;
  65
  66 // LayerTreeHost->Proxy callback interface.
  67 class LayerTreeHostImplClient {
  68  public:
  69   virtual void UpdateRendererCapabilitiesOnImplThread() = 0;
  70   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
  71   virtual void CommitVSyncParameters(base::TimeTicks timebase,
  72                                      base::TimeDelta interval) = 0;
  73   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) = 0;
  74   virtual void SetMaxSwapsPendingOnImplThread(int max) = 0;
  75   virtual void DidSwapBuffersOnImplThread() = 0;
  76   virtual void DidSwapBuffersCompleteOnImplThread() = 0;
  77   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
  78   virtual void NotifyReadyToActivate() = 0;
  79   // Please call these 3 functions through
  80   // LayerTreeHostImpl's SetNeedsRedraw(), SetNeedsRedrawRect() and
  81   // SetNeedsAnimate().
  82   virtual void SetNeedsRedrawOnImplThread() = 0;
  83   virtual void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) = 0;
  84   virtual void SetNeedsAnimateOnImplThread() = 0;
  85   virtual void DidInitializeVisibleTileOnImplThread() = 0;
  86   virtual void SetNeedsCommitOnImplThread() = 0;
  87   virtual void SetNeedsManageTilesOnImplThread() = 0;
  88   virtual void PostAnimationEventsToMainThreadOnImplThread(
  89       scoped_ptr<AnimationEventsVector> events) = 0;
  90   // Returns true if resources were deleted by this call.
  91   virtual bool ReduceContentsTextureMemoryOnImplThread(
  92       size_t limit_bytes,
  93       int priority_cutoff) = 0;
  94   virtual bool IsInsideDraw() = 0;
  95   virtual void RenewTreePriority() = 0;
  96   virtual void PostDelayedScrollbarFadeOnImplThread(
  97       const base::Closure& start_fade,
  98       base::TimeDelta delay) = 0;
  99   virtual void DidActivateSyncTree() = 0;
 100   virtual void DidManageTiles() = 0;
 101
 102  protected:
 103   virtual ~LayerTreeHostImplClient() {}
 104 };
 105
 106 // LayerTreeHostImpl owns the LayerImpl trees as well as associated rendering
 107 // state.
 108 class CC_EXPORT LayerTreeHostImpl
 109     : public InputHandler,
 110       public RendererClient,
 111       public TileManagerClient,
 112       public OutputSurfaceClient,
 113       public TopControlsManagerClient,
 114       public ScrollbarAnimationControllerClient,
 115       public BeginFrameSourceMixIn,
 116       public base::SupportsWeakPtr<LayerTreeHostImpl> {
 117  public:
 118   static scoped_ptr<LayerTreeHostImpl> Create(
 119       const LayerTreeSettings& settings,
 120       LayerTreeHostImplClient* client,
 121       Proxy* proxy,
 122       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 123       SharedBitmapManager* shared_bitmap_manager,
 124       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 125       int id);
 126   ~LayerTreeHostImpl() override;
 127
 128   // BeginFrameSourceMixIn implementation
 129   void OnNeedsBeginFramesChange(bool needs_begin_frames) override;
 130
 131   // InputHandler implementation
 132   void BindToClient(InputHandlerClient* client) override;
 133   InputHandler::ScrollStatus ScrollBegin(
 134       const gfx::Point& viewport_point,
 135       InputHandler::ScrollInputType type) override;
 136   InputHandler::ScrollStatus ScrollAnimated(
 137       const gfx::Point& viewport_point,
 138       const gfx::Vector2dF& scroll_delta) override;
 139   bool ScrollBy(const gfx::Point& viewport_point,
 140                 const gfx::Vector2dF& scroll_delta) override;
 141   bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
 142                               ScrollDirection direction) override;
 143   void SetRootLayerScrollOffsetDelegate(
 144       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) override;
 145   void OnRootLayerDelegatedScrollOffsetChanged() override;
 146   void ScrollEnd() override;
 147   InputHandler::ScrollStatus FlingScrollBegin() override;
 148   void MouseMoveAt(const gfx::Point& viewport_point) override;
 149   void PinchGestureBegin() override;
 150   void PinchGestureUpdate(float magnify_delta,
 151                           const gfx::Point& anchor) override;
 152   void PinchGestureEnd() override;
 153   void SetNeedsAnimate() override;
 154   bool IsCurrentlyScrollingLayerAt(const gfx::Point& viewport_point,
 155                                    InputHandler::ScrollInputType type) override;
 156   bool HaveTouchEventHandlersAt(const gfx::Point& viewport_port) override;
 157   scoped_ptr<SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
 158       ui::LatencyInfo* latency) override;
 159
 160   // TopControlsManagerClient implementation.
 161   void SetControlsTopOffset(float offset) override;
 162   float ControlsTopOffset() const override;
 163   void DidChangeTopControlsPosition() override;
 164   bool HaveRootScrollLayer() const override;
 165
 166   struct CC_EXPORT FrameData : public RenderPassSink {
 167     FrameData();
 168     ~FrameData() override;
 169     void AsValueInto(base::debug::TracedValue* value) const;
 170
 171     std::vector<gfx::Rect> occluding_screen_space_rects;
 172     std::vector<gfx::Rect> non_occluding_screen_space_rects;
 173     RenderPassList render_passes;
 174     RenderPassIdHashMap render_passes_by_id;
 175     const LayerImplList* render_surface_layer_list;
 176     LayerImplList will_draw_layers;
 177     bool contains_incomplete_tile;
 178     bool has_no_damage;
 179
 180     // RenderPassSink implementation.
 181     void AppendRenderPass(scoped_ptr<RenderPass> render_pass) override;
 182   };
 183
 184   virtual void BeginMainFrameAborted(bool did_handle);
 185   virtual void BeginCommit();
 186   virtual void CommitComplete();
 187   virtual void Animate(base::TimeTicks monotonic_time);
 188   virtual void UpdateAnimationState(bool start_ready_animations);
 189   void ActivateAnimations();
 190   void MainThreadHasStoppedFlinging();
 191   void UpdateBackgroundAnimateTicking(bool should_background_tick);
 192   void DidAnimateScrollOffset();
 193   void SetViewportDamage(const gfx::Rect& damage_rect);
 194
 195   virtual void ManageTiles();
 196
 197   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
 198   // should try to avoid displaying the frame. If PrepareToDraw is called,
 199   // DidDrawAllLayers must also be called, regardless of whether DrawLayers is
 200   // called between the two.
 201   virtual DrawResult PrepareToDraw(FrameData* frame);
 202   virtual void DrawLayers(FrameData* frame, base::TimeTicks frame_begin_time);
 203   // Must be called if and only if PrepareToDraw was called.
 204   void DidDrawAllLayers(const FrameData& frame);
 205
 206   const LayerTreeSettings& settings() const { return settings_; }
 207
 208   // Evict all textures by enforcing a memory policy with an allocation of 0.
 209   void EvictTexturesForTesting();
 210
 211   // When blocking, this prevents client_->NotifyReadyToActivate() from being
 212   // called. When disabled, it calls client_->NotifyReadyToActivate()
 213   // immediately if any notifications had been blocked while blocking.
 214   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 215
 216   // This allows us to inject DidInitializeVisibleTile events for testing.
 217   void DidInitializeVisibleTileForTesting();
 218
 219   // Resets all of the trees to an empty state.
 220   void ResetTreesForTesting();
 221
 222   DrawMode GetDrawMode() const;
 223
 224   // Viewport size in draw space: this size is in physical pixels and is used
 225   // for draw properties, tilings, quads and render passes.
 226   gfx::Size DrawViewportSize() const;
 227
 228   // Viewport rect in view space used for tiling prioritization.
 229   const gfx::Rect ViewportRectForTilePriority() const;
 230
 231   // RendererClient implementation.
 232   void SetFullRootLayerDamage() override;
 233
 234   // TileManagerClient implementation.
 235   const std::vector<PictureLayerImpl*>& GetPictureLayers() const override;
 236   void NotifyReadyToActivate() override;
 237   void NotifyTileStateChanged(const Tile* tile) override;
 238   void BuildRasterQueue(RasterTilePriorityQueue* queue,
 239                         TreePriority tree_priority) override;
 240   void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
 241                           TreePriority tree_priority) override;
 242
 243   // ScrollbarAnimationControllerClient implementation.
 244   void PostDelayedScrollbarFade(const base::Closure& start_fade,
 245                                 base::TimeDelta delay) override;
 246   void SetNeedsScrollbarAnimationFrame() override;
 247
 248   // OutputSurfaceClient implementation.
 249   void DeferredInitialize() override;
 250   void ReleaseGL() override;
 251   void CommitVSyncParameters(base::TimeTicks timebase,
 252                              base::TimeDelta interval) override;
 253   void SetNeedsRedrawRect(const gfx::Rect& rect) override;
 254   void BeginFrame(const BeginFrameArgs& args) override;
 255
 256   void SetExternalDrawConstraints(
 257       const gfx::Transform& transform,
 258       const gfx::Rect& viewport,
 259       const gfx::Rect& clip,
 260       const gfx::Rect& viewport_rect_for_tile_priority,
 261       const gfx::Transform& transform_for_tile_priority,
 262       bool resourceless_software_draw) override;
 263   void DidLoseOutputSurface() override;
 264   void DidSwapBuffers() override;
 265   void DidSwapBuffersComplete() override;
 266   void ReclaimResources(const CompositorFrameAck* ack) override;
 267   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
 268   void SetTreeActivationCallback(const base::Closure& callback) override;
 269
 270   // Called from LayerTreeImpl.
 271   void OnCanDrawStateChangedForTree();
 272
 273   // Implementation.
 274   int id() const { return id_; }
 275   bool CanDraw() const;
 276   OutputSurface* output_surface() const { return output_surface_.get(); }
 277
 278   std::string LayerTreeAsJson() const;
 279
 280   void FinishAllRendering();
 281   int SourceAnimationFrameNumber() const;
 282
 283   virtual bool InitializeRenderer(scoped_ptr<OutputSurface> output_surface);
 284   TileManager* tile_manager() { return tile_manager_.get(); }
 285   void SetUseGpuRasterization(bool use_gpu);
 286   bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
 287   bool create_low_res_tiling() const {
 288     return settings_.create_low_res_tiling && !use_gpu_rasterization_;
 289   }
 290   ResourcePool* resource_pool() { return resource_pool_.get(); }
 291   Renderer* renderer() { return renderer_.get(); }
 292   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
 293
 294   virtual bool SwapBuffers(const FrameData& frame);
 295   virtual void WillBeginImplFrame(const BeginFrameArgs& args);
 296   void DidModifyTilePriorities();
 297
 298   LayerTreeImpl* active_tree() { return active_tree_.get(); }
 299   const LayerTreeImpl* active_tree() const { return active_tree_.get(); }
 300   LayerTreeImpl* pending_tree() { return pending_tree_.get(); }
 301   const LayerTreeImpl* pending_tree() const { return pending_tree_.get(); }
 302   LayerTreeImpl* recycle_tree() { return recycle_tree_.get(); }
 303   const LayerTreeImpl* recycle_tree() const { return recycle_tree_.get(); }
 304   // Returns the tree LTH synchronizes with.
 305   LayerTreeImpl* sync_tree() {
 306     return pending_tree_ ? pending_tree_.get() : active_tree_.get();
 307   }
 308   virtual void CreatePendingTree();
 309   virtual void UpdateVisibleTiles();
 310   virtual void ActivateSyncTree();
 311
 312   // Shortcuts to layers on the active tree.
 313   LayerImpl* RootLayer() const;
 314   LayerImpl* InnerViewportScrollLayer() const;
 315   LayerImpl* OuterViewportScrollLayer() const;
 316   LayerImpl* CurrentlyScrollingLayer() const;
 317
 318   int scroll_layer_id_when_mouse_over_scrollbar() const {
 319     return scroll_layer_id_when_mouse_over_scrollbar_;
 320   }
 321   bool scroll_affects_scroll_handler() const {
 322     return scroll_affects_scroll_handler_;
 323   }
 324   void QueueSwapPromiseForMainThreadScrollUpdate(
 325       scoped_ptr<SwapPromise> swap_promise);
 326
 327   bool IsActivelyScrolling() const;
 328
 329   virtual void SetVisible(bool visible);
 330   bool visible() const { return visible_; }
 331
 332   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
 333   void SetNeedsRedraw();
 334
 335   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
 336
 337   size_t memory_allocation_limit_bytes() const;
 338   int memory_allocation_priority_cutoff() const;
 339
 340   void SetViewportSize(const gfx::Size& device_viewport_size);
 341   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 342
 343   void SetOverhangUIResource(UIResourceId overhang_ui_resource_id,
 344                              const gfx::Size& overhang_ui_resource_size);
 345
 346   void SetDeviceScaleFactor(float device_scale_factor);
 347   float device_scale_factor() const { return device_scale_factor_; }
 348
 349   const gfx::Transform& DrawTransform() const;
 350
 351   scoped_ptr<ScrollAndScaleSet> ProcessScrollDeltas();
 352
 353   bool needs_animate_layers() const {
 354     return !animation_registrar_->active_animation_controllers().empty();
 355   }
 356
 357   void set_max_memory_needed_bytes(size_t bytes) {
 358     max_memory_needed_bytes_ = bytes;
 359   }
 360
 361   FrameRateCounter* fps_counter() {
 362     return fps_counter_.get();
 363   }
 364   PaintTimeCounter* paint_time_counter() {
 365     return paint_time_counter_.get();
 366   }
 367   MemoryHistory* memory_history() {
 368     return memory_history_.get();
 369   }
 370   DebugRectHistory* debug_rect_history() {
 371     return debug_rect_history_.get();
 372   }
 373   ResourceProvider* resource_provider() {
 374     return resource_provider_.get();
 375   }
 376   TopControlsManager* top_controls_manager() {
 377     return top_controls_manager_.get();
 378   }
 379   const GlobalStateThatImpactsTilePriority& global_tile_state() {
 380     return global_tile_state_;
 381   }
 382
 383   Proxy* proxy() const { return proxy_; }
 384
 385   AnimationRegistrar* animation_registrar() const {
 386     return animation_registrar_.get();
 387   }
 388
 389   void SetDebugState(const LayerTreeDebugState& new_debug_state);
 390   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 391
 392   class CC_EXPORT CullRenderPassesWithNoQuads {
 393    public:
 394     bool ShouldRemoveRenderPass(const RenderPassDrawQuad& quad,
 395                                 const FrameData& frame) const;
 396
 397     // Iterates in draw order, so that when a surface is removed, and its
 398     // target becomes empty, then its target can be removed also.
 399     size_t RenderPassListBegin(const RenderPassList& list) const { return 0; }
 400     size_t RenderPassListEnd(const RenderPassList& list) const {
 401       return list.size();
 402     }
 403     size_t RenderPassListNext(size_t it) const { return it + 1; }
 404   };
 405
 406   template <typename RenderPassCuller>
 407       static void RemoveRenderPasses(RenderPassCuller culler, FrameData* frame);
 408
 409   gfx::Vector2dF accumulated_root_overscroll() const {
 410     return accumulated_root_overscroll_;
 411   }
 412
 413   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 414
 415   void SetTreePriority(TreePriority priority);
 416   TreePriority GetTreePriority() const;
 417
 418   void UpdateCurrentBeginFrameArgs(const BeginFrameArgs& args);
 419   void ResetCurrentBeginFrameArgsForNextFrame();
 420   virtual BeginFrameArgs CurrentBeginFrameArgs() const;
 421
 422   // Expected time between two begin impl frame calls.
 423   base::TimeDelta begin_impl_frame_interval() const {
 424     return begin_impl_frame_interval_;
 425   }
 426
 427   void AsValueInto(base::debug::TracedValue* value) const override;
 428   void AsValueWithFrameInto(FrameData* frame,
 429                             base::debug::TracedValue* value) const;
 430   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
 431   scoped_refptr<base::debug::ConvertableToTraceFormat> AsValueWithFrame(
 432       FrameData* frame) const;
 433   scoped_refptr<base::debug::ConvertableToTraceFormat> ActivationStateAsValue()
 434       const;
 435   void ActivationStateAsValueInto(base::debug::TracedValue* value) const;
 436
 437   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 438
 439   virtual void CreateUIResource(UIResourceId uid,
 440                                 const UIResourceBitmap& bitmap);
 441   // Deletes a UI resource.  May safely be called more than once.
 442   virtual void DeleteUIResource(UIResourceId uid);
 443   void EvictAllUIResources();
 444   bool EvictedUIResourcesExist() const;
 445
 446   virtual ResourceProvider::ResourceId ResourceIdForUIResource(
 447       UIResourceId uid) const;
 448
 449   virtual bool IsUIResourceOpaque(UIResourceId uid) const;
 450
 451   struct UIResourceData {
 452     ResourceProvider::ResourceId resource_id;
 453     gfx::Size size;
 454     bool opaque;
 455   };
 456
 457   void ScheduleMicroBenchmark(scoped_ptr<MicroBenchmarkImpl> benchmark);
 458
 459   CompositorFrameMetadata MakeCompositorFrameMetadata() const;
 460   // Viewport rectangle and clip in nonflipped window space.  These rects
 461   // should only be used by Renderer subclasses to populate glViewport/glClip
 462   // and their software-mode equivalents.
 463   gfx::Rect DeviceViewport() const;
 464   gfx::Rect DeviceClip() const;
 465
 466   // When a SwapPromiseMonitor is created on the impl thread, it calls
 467   // InsertSwapPromiseMonitor() to register itself with LayerTreeHostImpl.
 468   // When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
 469   // to unregister itself.
 470   void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 471   void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
 472
 473   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 474   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 475
 476   void GetPictureLayerImplPairs(
 477       std::vector<PictureLayerImpl::Pair>* layers) const;
 478
 479   void SetTopControlsLayoutHeight(float height);
 480
 481   void SetRequiresHighResToDraw() { requires_high_res_to_draw_ = true; }
 482   void ResetRequiresHighResToDraw() { requires_high_res_to_draw_ = false; }
 483   bool RequiresHighResToDraw() const { return requires_high_res_to_draw_; }
 484
 485   // Only valid for synchronous (non-scheduled) single-threaded case.
 486   void SynchronouslyInitializeAllTiles();
 487
 488   bool CanUseZeroCopyRasterizer() const;
 489   bool CanUseOneCopyRasterizer() const;
 490   virtual void CreateResourceAndRasterWorkerPool(
 491       scoped_ptr<RasterWorkerPool>* raster_worker_pool,
 492       scoped_ptr<ResourcePool>* resource_pool,
 493       scoped_ptr<ResourcePool>* staging_resource_pool);
 494
 495  protected:
 496   LayerTreeHostImpl(
 497       const LayerTreeSettings& settings,
 498       LayerTreeHostImplClient* client,
 499       Proxy* proxy,
 500       RenderingStatsInstrumentation* rendering_stats_instrumentation,
 501       SharedBitmapManager* shared_bitmap_manager,
 502       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
 503       int id);
 504
 505   void UpdateViewportContainerSizes();
 506
 507   // Virtual for testing.
 508   virtual void AnimateLayers(base::TimeTicks monotonic_time);
 509   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
 510
 511   const AnimationRegistrar::AnimationControllerMap&
 512       active_animation_controllers() const {
 513     return animation_registrar_->active_animation_controllers();
 514   }
 515
 516   bool manage_tiles_needed() const { return tile_priorities_dirty_; }
 517
 518   LayerTreeHostImplClient* client_;
 519   Proxy* proxy_;
 520
 521  private:
 522   void CreateAndSetRenderer();
 523   void CreateAndSetTileManager();
 524   void DestroyTileManager();
 525   void ReleaseTreeResources();
 526   void EnforceZeroBudget(bool zero_budget);
 527
 528   bool UsePendingTreeForSync() const;
 529   bool IsSynchronousSingleThreaded() const;
 530
 531   // Scroll by preferring to move the outer viewport first, only moving the
 532   // inner if the outer is at its scroll extents.
 533   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
 534   // Scroll by preferring to move the inner viewport first, only moving the
 535   // outer if the inner is at its scroll extents.
 536   void ScrollViewportInnerFirst(gfx::Vector2dF scroll_delta);
 537   void AnimatePageScale(base::TimeTicks monotonic_time);
 538   void AnimateScrollbars(base::TimeTicks monotonic_time);
 539   void AnimateTopControls(base::TimeTicks monotonic_time);
 540
 541   bool ShouldTopControlsConsumeScroll(const gfx::Vector2dF& scroll_delta) const;
 542
 543   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
 544       LayerImpl* layer_impl,
 545       float scale_from_viewport_to_screen_space,
 546       const gfx::PointF& viewport_point,
 547       const gfx::Vector2dF& viewport_delta);
 548
 549   void TrackDamageForAllSurfaces(
 550       LayerImpl* root_draw_layer,
 551       const LayerImplList& render_surface_layer_list);
 552
 553   void UpdateTileManagerMemoryPolicy(const ManagedMemoryPolicy& policy);
 554
 555   // This function should only be called from PrepareToDraw, as DidDrawAllLayers
 556   // must be called if this helper function is called.  Returns DRAW_SUCCESS if
 557   // the frame should be drawn.
 558   DrawResult CalculateRenderPasses(FrameData* frame);
 559
 560   void ClearCurrentlyScrollingLayer();
 561
 562   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
 563                                 const gfx::PointF& device_viewport_point);
 564
 565   void AnimateScrollbarsRecursive(LayerImpl* layer,
 566                                   base::TimeTicks time);
 567
 568   LayerImpl* FindScrollLayerForDeviceViewportPoint(
 569       const gfx::PointF& device_viewport_point,
 570       InputHandler::ScrollInputType type,
 571       LayerImpl* layer_hit_by_point,
 572       bool* scroll_on_main_thread,
 573       bool* optional_has_ancestor_scroll_handler) const;
 574   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
 575                                    LayerImpl* layer_impl);
 576   void StartScrollbarFadeRecursive(LayerImpl* layer);
 577   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
 578                               bool zero_budget);
 579   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
 580
 581   void DidInitializeVisibleTile();
 582
 583   void MarkUIResourceNotEvicted(UIResourceId uid);
 584
 585   void NotifySwapPromiseMonitorsOfSetNeedsRedraw();
 586   void NotifySwapPromiseMonitorsOfForwardingToMainThread();
 587
 588   typedef base::hash_map<UIResourceId, UIResourceData>
 589       UIResourceMap;
 590   UIResourceMap ui_resource_map_;
 591
 592   // Resources that were evicted by EvictAllUIResources. Resources are removed
 593   // from this when they are touched by a create or destroy from the UI resource
 594   // request queue.
 595   std::set<UIResourceId> evicted_ui_resources_;
 596
 597   scoped_ptr<OutputSurface> output_surface_;
 598
 599   // |resource_provider_| and |tile_manager_| can be NULL, e.g. when using tile-
 600   // free rendering - see OutputSurface::ForcedDrawToSoftwareDevice().
 601   scoped_ptr<ResourceProvider> resource_provider_;
 602   scoped_ptr<TileManager> tile_manager_;
 603   bool use_gpu_rasterization_;
 604   scoped_ptr<RasterWorkerPool> raster_worker_pool_;
 605   scoped_ptr<ResourcePool> resource_pool_;
 606   scoped_ptr<ResourcePool> staging_resource_pool_;
 607   scoped_ptr<Renderer> renderer_;
 608
 609   GlobalStateThatImpactsTilePriority global_tile_state_;
 610
 611   // Tree currently being drawn.
 612   scoped_ptr<LayerTreeImpl> active_tree_;
 613
 614   // In impl-side painting mode, tree with possibly incomplete rasterized
 615   // content. May be promoted to active by ActivatePendingTree().
 616   scoped_ptr<LayerTreeImpl> pending_tree_;
 617
 618   // In impl-side painting mode, inert tree with layers that can be recycled
 619   // by the next sync from the main thread.
 620   scoped_ptr<LayerTreeImpl> recycle_tree_;
 621
 622   InputHandlerClient* input_handler_client_;
 623   bool did_lock_scrolling_layer_;
 624   bool should_bubble_scrolls_;
 625   bool wheel_scrolling_;
 626   bool scroll_affects_scroll_handler_;
 627   int scroll_layer_id_when_mouse_over_scrollbar_;
 628   ScopedPtrVector<SwapPromise> swap_promises_for_main_thread_scroll_update_;
 629
 630   bool tile_priorities_dirty_;
 631
 632   // The optional delegate for the root layer scroll offset.
 633   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 634   LayerTreeSettings settings_;
 635   LayerTreeDebugState debug_state_;
 636   bool visible_;
 637   ManagedMemoryPolicy cached_managed_memory_policy_;
 638
 639   gfx::Vector2dF accumulated_root_overscroll_;
 640
 641   bool pinch_gesture_active_;
 642   bool pinch_gesture_end_should_clear_scrolling_layer_;
 643   gfx::Point previous_pinch_anchor_;
 644
 645   scoped_ptr<TopControlsManager> top_controls_manager_;
 646
 647   scoped_ptr<PageScaleAnimation> page_scale_animation_;
 648
 649   // This is used for ticking animations slowly when hidden.
 650   scoped_ptr<LayerTreeHostImplTimeSourceAdapter> time_source_client_adapter_;
 651
 652   scoped_ptr<FrameRateCounter> fps_counter_;
 653   scoped_ptr<PaintTimeCounter> paint_time_counter_;
 654   scoped_ptr<MemoryHistory> memory_history_;
 655   scoped_ptr<DebugRectHistory> debug_rect_history_;
 656
 657   scoped_ptr<TextureMailboxDeleter> texture_mailbox_deleter_;
 658
 659   // The maximum memory that would be used by the prioritized resource
 660   // manager, if there were no limit on memory usage.
 661   size_t max_memory_needed_bytes_;
 662
 663   bool zero_budget_;
 664
 665   // Viewport size passed in from the main thread, in physical pixels.  This
 666   // value is the default size for all concepts of physical viewport (draw
 667   // viewport, scrolling viewport and device viewport), but it can be
 668   // overridden.
 669   gfx::Size device_viewport_size_;
 670
 671   // Conversion factor from CSS pixels to physical pixels when
 672   // pageScaleFactor=1.
 673   float device_scale_factor_;
 674
 675   // UI resource to use for drawing overhang gutters.
 676   UIResourceId overhang_ui_resource_id_;
 677   gfx::Size overhang_ui_resource_size_;
 678
 679   // Optional top-level constraints that can be set by the OutputSurface.
 680   // - external_transform_ applies a transform above the root layer
 681   // - external_viewport_ is used DrawProperties, tile management and
 682   // glViewport/window projection matrix.
 683   // - external_clip_ specifies a top-level clip rect
 684   // - viewport_rect_for_tile_priority_ is the rect in view space used for
 685   // tiling priority.
 686   gfx::Transform external_transform_;
 687   gfx::Rect external_viewport_;
 688   gfx::Rect external_clip_;
 689   gfx::Rect viewport_rect_for_tile_priority_;
 690   bool resourceless_software_draw_;
 691
 692   gfx::Rect viewport_damage_rect_;
 693
 694   BeginFrameArgs current_begin_frame_args_;
 695
 696   // Expected time between two begin impl frame calls.
 697   base::TimeDelta begin_impl_frame_interval_;
 698
 699   scoped_ptr<AnimationRegistrar> animation_registrar_;
 700
 701   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 702   MicroBenchmarkControllerImpl micro_benchmark_controller_;
 703   scoped_ptr<TaskGraphRunner> single_thread_synchronous_task_graph_runner_;
 704
 705   bool need_to_update_visible_tiles_before_draw_;
 706
 707   // Optional callback to notify of new tree activations.
 708   base::Closure tree_activation_callback_;
 709
 710   SharedBitmapManager* shared_bitmap_manager_;
 711   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 712   int id_;
 713
 714   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 715
 716   std::vector<PictureLayerImpl*> picture_layers_;
 717   std::vector<PictureLayerImpl::Pair> picture_layer_pairs_;
 718
 719   bool requires_high_res_to_draw_;
 720
 721   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 722 };
 723
 724 }  // namespace cc
 725
 726 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_