src/cc/trees/layer_tree_host_impl.h

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