cc/trees/layer_tree_impl.h

   1 // Copyright 2012 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_IMPL_H_
   6 #define CC_TREES_LAYER_TREE_IMPL_H_
   7
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/containers/hash_tables.h"
  13 #include "base/values.h"
  14 #include "cc/base/scoped_ptr_vector.h"
  15 #include "cc/base/synced_property.h"
  16 #include "cc/input/layer_selection_bound.h"
  17 #include "cc/layers/layer_impl.h"
  18 #include "cc/output/begin_frame_args.h"
  19 #include "cc/output/renderer.h"
  20 #include "cc/output/swap_promise.h"
  21 #include "cc/resources/ui_resource_client.h"
  22 #include "cc/trees/layer_tree_host_impl.h"
  23 #include "cc/trees/property_tree.h"
  24
  25 namespace base {
  26 namespace trace_event {
  27 class TracedValue;
  28 }
  29 }
  30
  31 namespace cc {
  32
  33 class ContextProvider;
  34 class DebugRectHistory;
  35 class FrameRateCounter;
  36 class HeadsUpDisplayLayerImpl;
  37 class LayerExternalScrollOffsetListener;
  38 class LayerScrollOffsetDelegate;
  39 class LayerTreeDebugState;
  40 class LayerTreeImpl;
  41 class LayerTreeSettings;
  42 class MemoryHistory;
  43 class OutputSurface;
  44 class PageScaleAnimation;
  45 class PaintTimeCounter;
  46 class PictureLayerImpl;
  47 class Proxy;
  48 class ResourceProvider;
  49 class TileManager;
  50 class UIResourceRequest;
  51 class VideoFrameControllerClient;
  52 struct PendingPageScaleAnimation;
  53 struct RendererCapabilities;
  54
  55 typedef std::vector<UIResourceRequest> UIResourceRequestQueue;
  56 typedef SyncedProperty<AdditionGroup<float>> SyncedTopControls;
  57 typedef SyncedProperty<AdditionGroup<gfx::Vector2dF>> SyncedElasticOverscroll;
  58
  59 class CC_EXPORT LayerTreeImpl {
  60  public:
  61   static scoped_ptr<LayerTreeImpl> create(
  62       LayerTreeHostImpl* layer_tree_host_impl,
  63       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
  64       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
  65       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll) {
  66     return make_scoped_ptr(
  67         new LayerTreeImpl(layer_tree_host_impl, page_scale_factor,
  68                           top_controls_shown_ratio, elastic_overscroll));
  69   }
  70   virtual ~LayerTreeImpl();
  71
  72   void Shutdown();
  73   void ReleaseResources();
  74   void RecreateResources();
  75
  76   // Methods called by the layer tree that pass-through or access LTHI.
  77   // ---------------------------------------------------------------------------
  78   const LayerTreeSettings& settings() const;
  79   const LayerTreeDebugState& debug_state() const;
  80   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
  81   ContextProvider* context_provider() const;
  82   OutputSurface* output_surface() const;
  83   ResourceProvider* resource_provider() const;
  84   TileManager* tile_manager() const;
  85   FrameRateCounter* frame_rate_counter() const;
  86   PaintTimeCounter* paint_time_counter() const;
  87   MemoryHistory* memory_history() const;
  88   gfx::Size device_viewport_size() const;
  89   float device_scale_factor() const;
  90   DebugRectHistory* debug_rect_history() const;
  91   bool IsActiveTree() const;
  92   bool IsPendingTree() const;
  93   bool IsRecycleTree() const;
  94   bool IsSyncTree() const;
  95   LayerImpl* FindActiveTreeLayerById(int id);
  96   LayerImpl* FindPendingTreeLayerById(int id);
  97   bool PinchGestureActive() const;
  98   BeginFrameArgs CurrentBeginFrameArgs() const;
  99   base::TimeDelta CurrentBeginFrameInterval() const;
 100   void SetNeedsCommit();
 101   gfx::Rect DeviceViewport() const;
 102   gfx::Size DrawViewportSize() const;
 103   const gfx::Rect ViewportRectForTilePriority() const;
 104   scoped_ptr<ScrollbarAnimationController> CreateScrollbarAnimationController(
 105       LayerImpl* scrolling_layer);
 106   void DidAnimateScrollOffset();
 107   void InputScrollAnimationFinished();
 108   bool use_gpu_rasterization() const;
 109   GpuRasterizationStatus GetGpuRasterizationStatus() const;
 110   bool create_low_res_tiling() const;
 111   BlockingTaskRunner* BlockingMainThreadTaskRunner() const;
 112   bool RequiresHighResToDraw() const;
 113   bool SmoothnessTakesPriority() const;
 114   VideoFrameControllerClient* GetVideoFrameControllerClient() const;
 115
 116   // Tree specific methods exposed to layer-impl tree.
 117   // ---------------------------------------------------------------------------
 118   void SetNeedsRedraw();
 119
 120   // Tracing methods.
 121   // ---------------------------------------------------------------------------
 122   void GetAllPrioritizedTilesForTracing(
 123       std::vector<PrioritizedTile>* prioritized_tiles) const;
 124   void AsValueInto(base::trace_event::TracedValue* dict) const;
 125
 126   // Other public methods
 127   // ---------------------------------------------------------------------------
 128   LayerImpl* root_layer() const { return root_layer_.get(); }
 129   void SetRootLayer(scoped_ptr<LayerImpl>);
 130   scoped_ptr<LayerImpl> DetachLayerTree();
 131
 132   void SetPropertyTrees(const PropertyTrees& property_trees) {
 133     property_trees_ = property_trees;
 134   }
 135   PropertyTrees* property_trees() { return &property_trees_; }
 136
 137   void PushPropertiesTo(LayerTreeImpl* tree_impl);
 138
 139   int source_frame_number() const { return source_frame_number_; }
 140   void set_source_frame_number(int frame_number) {
 141     source_frame_number_ = frame_number;
 142   }
 143
 144   HeadsUpDisplayLayerImpl* hud_layer() { return hud_layer_; }
 145   void set_hud_layer(HeadsUpDisplayLayerImpl* layer_impl) {
 146     hud_layer_ = layer_impl;
 147   }
 148
 149   LayerImpl* InnerViewportScrollLayer() const;
 150   // This function may return NULL, it is the caller's responsibility to check.
 151   LayerImpl* OuterViewportScrollLayer() const;
 152   gfx::ScrollOffset TotalScrollOffset() const;
 153   gfx::ScrollOffset TotalMaxScrollOffset() const;
 154
 155   LayerImpl* InnerViewportContainerLayer() const;
 156   LayerImpl* OuterViewportContainerLayer() const;
 157   LayerImpl* CurrentlyScrollingLayer() const;
 158   void SetCurrentlyScrollingLayer(LayerImpl* layer);
 159   void ClearCurrentlyScrollingLayer();
 160
 161   void SetViewportLayersFromIds(int overscroll_elasticity_layer,
 162                                 int page_scale_layer_id,
 163                                 int inner_viewport_scroll_layer_id,
 164                                 int outer_viewport_scroll_layer_id);
 165   void ClearViewportLayers();
 166   LayerImpl* overscroll_elasticity_layer() {
 167     return overscroll_elasticity_layer_;
 168   }
 169   LayerImpl* page_scale_layer() { return page_scale_layer_; }
 170   void ApplySentScrollAndScaleDeltasFromAbortedCommit();
 171
 172   SkColor background_color() const { return background_color_; }
 173   void set_background_color(SkColor color) { background_color_ = color; }
 174
 175   bool has_transparent_background() const {
 176     return has_transparent_background_;
 177   }
 178   void set_has_transparent_background(bool transparent) {
 179     has_transparent_background_ = transparent;
 180   }
 181
 182   void SetPageScaleOnActiveTree(float active_page_scale);
 183   void PushPageScaleFromMainThread(float page_scale_factor,
 184                                    float min_page_scale_factor,
 185                                    float max_page_scale_factor);
 186   float current_page_scale_factor() const {
 187     return page_scale_factor()->Current(IsActiveTree());
 188   }
 189   float min_page_scale_factor() const { return min_page_scale_factor_; }
 190   float max_page_scale_factor() const { return max_page_scale_factor_; }
 191
 192   float page_scale_delta() const { return page_scale_factor()->Delta(); }
 193
 194   SyncedProperty<ScaleGroup>* page_scale_factor();
 195   const SyncedProperty<ScaleGroup>* page_scale_factor() const;
 196
 197   SyncedElasticOverscroll* elastic_overscroll() {
 198     return elastic_overscroll_.get();
 199   }
 200   const SyncedElasticOverscroll* elastic_overscroll() const {
 201     return elastic_overscroll_.get();
 202   }
 203
 204   SyncedTopControls* top_controls_shown_ratio() {
 205     return top_controls_shown_ratio_.get();
 206   }
 207   const SyncedTopControls* top_controls_shown_ratio() const {
 208     return top_controls_shown_ratio_.get();
 209   }
 210
 211   // Updates draw properties and render surface layer list, as well as tile
 212   // priorities. Returns false if it was unable to update.  Updating lcd
 213   // text may cause invalidations, so should only be done after a commit.
 214   bool UpdateDrawProperties(bool update_lcd_text);
 215   void BuildPropertyTreesForTesting();
 216
 217   void set_needs_update_draw_properties() {
 218     needs_update_draw_properties_ = true;
 219   }
 220   bool needs_update_draw_properties() const {
 221     return needs_update_draw_properties_;
 222   }
 223
 224   void set_needs_full_tree_sync(bool needs) { needs_full_tree_sync_ = needs; }
 225   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
 226
 227   void ForceRedrawNextActivation() { next_activation_forces_redraw_ = true; }
 228
 229   void set_has_ever_been_drawn(bool has_drawn) {
 230     has_ever_been_drawn_ = has_drawn;
 231   }
 232   bool has_ever_been_drawn() const { return has_ever_been_drawn_; }
 233
 234   void set_ui_resource_request_queue(const UIResourceRequestQueue& queue);
 235
 236   const LayerImplList& RenderSurfaceLayerList() const;
 237   const Region& UnoccludedScreenSpaceRegion() const;
 238
 239   // These return the size of the root scrollable area and the size of
 240   // the user-visible scrolling viewport, in CSS layout coordinates.
 241   gfx::Size ScrollableSize() const;
 242   gfx::SizeF ScrollableViewportSize() const;
 243
 244   gfx::Rect RootScrollLayerDeviceViewportBounds() const;
 245
 246   LayerImpl* LayerById(int id);
 247
 248   // These should be called by LayerImpl's ctor/dtor.
 249   void RegisterLayer(LayerImpl* layer);
 250   void UnregisterLayer(LayerImpl* layer);
 251
 252   size_t NumLayers();
 253
 254   AnimationRegistrar* GetAnimationRegistrar() const;
 255
 256   void PushPersistedState(LayerTreeImpl* pending_tree);
 257
 258   void DidBecomeActive();
 259
 260   bool ContentsTexturesPurged() const;
 261   void SetContentsTexturesPurged();
 262   void ResetContentsTexturesPurged();
 263
 264   // Set on the active tree when the viewport size recently changed
 265   // and the active tree's size is now out of date.
 266   bool ViewportSizeInvalid() const;
 267   void SetViewportSizeInvalid();
 268   void ResetViewportSizeInvalid();
 269
 270   // Useful for debug assertions, probably shouldn't be used for anything else.
 271   Proxy* proxy() const;
 272
 273   void SetRootLayerScrollOffsetDelegate(
 274       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate);
 275   void UpdateRootScrollOffsetDelegate();
 276   // Distribute the rool scroll between outer and inner viewport scroll layer.
 277   // The outer viewport scroll layer scrolls first.
 278   void DistributeRootScrollOffset();
 279
 280   // Call this function when you expect there to be a swap buffer.
 281   // See swap_promise.h for how to use SwapPromise.
 282   void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 283
 284   // Take the |new_swap_promise| and append it to |swap_promise_list_|.
 285   void PassSwapPromises(ScopedPtrVector<SwapPromise>* new_swap_promise);
 286   void FinishSwapPromises(CompositorFrameMetadata* metadata);
 287   void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
 288
 289   void DidModifyTilePriorities();
 290
 291   ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 292   void ProcessUIResourceRequestQueue();
 293
 294   bool IsUIResourceOpaque(UIResourceId uid) const;
 295
 296   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 297   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 298   const std::vector<PictureLayerImpl*>& picture_layers() const {
 299     return picture_layers_;
 300   }
 301
 302   void AddLayerWithCopyOutputRequest(LayerImpl* layer);
 303   void RemoveLayerWithCopyOutputRequest(LayerImpl* layer);
 304   const std::vector<LayerImpl*>& LayersWithCopyOutputRequest() const;
 305
 306   int current_render_surface_list_id() const {
 307     return render_surface_layer_list_id_;
 308   }
 309
 310   LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
 311       const gfx::PointF& screen_space_point);
 312
 313   LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
 314
 315   LayerImpl* FindLayerWithWheelHandlerThatIsHitByPoint(
 316       const gfx::PointF& screen_space_point);
 317
 318   LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
 319       const gfx::PointF& screen_space_point);
 320
 321   void RegisterSelection(const LayerSelection& selection);
 322
 323   // Compute the current selection handle location and visbility with respect to
 324   // the viewport.
 325   void GetViewportSelection(ViewportSelection* selection);
 326
 327   void set_top_controls_shrink_blink_size(bool shrink);
 328   bool top_controls_shrink_blink_size() const {
 329     return top_controls_shrink_blink_size_;
 330   }
 331   bool SetCurrentTopControlsShownRatio(float ratio);
 332   float CurrentTopControlsShownRatio() const {
 333     return top_controls_shown_ratio_->Current(IsActiveTree());
 334   }
 335   void set_top_controls_height(float top_controls_height);
 336   float top_controls_height() const { return top_controls_height_; }
 337   void PushTopControlsFromMainThread(float top_controls_shown_ratio);
 338
 339   void SetPendingPageScaleAnimation(
 340       scoped_ptr<PendingPageScaleAnimation> pending_animation);
 341   scoped_ptr<PendingPageScaleAnimation> TakePendingPageScaleAnimation();
 342
 343   void GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids);
 344
 345   bool IsExternalFlingActive() const;
 346   void DidUpdateScrollOffset(int layer_id);
 347
 348  protected:
 349   explicit LayerTreeImpl(
 350       LayerTreeHostImpl* layer_tree_host_impl,
 351       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
 352       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
 353       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll);
 354   float ClampPageScaleFactorToLimits(float page_scale_factor) const;
 355   void PushPageScaleFactorAndLimits(const float* page_scale_factor,
 356                                     float min_page_scale_factor,
 357                                     float max_page_scale_factor);
 358   bool SetPageScaleFactorLimits(float min_page_scale_factor,
 359                                 float max_page_scale_factor);
 360   void DidUpdatePageScale();
 361   void HideInnerViewportScrollbarsIfNearMinimumScale();
 362   void PushTopControls(const float* top_controls_shown_ratio);
 363   LayerTreeHostImpl* layer_tree_host_impl_;
 364   int source_frame_number_;
 365   scoped_ptr<LayerImpl> root_layer_;
 366   HeadsUpDisplayLayerImpl* hud_layer_;
 367   PropertyTrees property_trees_;
 368   LayerImpl* currently_scrolling_layer_;
 369   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 370   SkColor background_color_;
 371   bool has_transparent_background_;
 372
 373   LayerImpl* overscroll_elasticity_layer_;
 374   LayerImpl* page_scale_layer_;
 375   LayerImpl* inner_viewport_scroll_layer_;
 376   LayerImpl* outer_viewport_scroll_layer_;
 377
 378   LayerSelection selection_;
 379
 380   scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor_;
 381   float min_page_scale_factor_;
 382   float max_page_scale_factor_;
 383
 384   scoped_refptr<SyncedElasticOverscroll> elastic_overscroll_;
 385
 386   typedef base::hash_map<int, LayerImpl*> LayerIdMap;
 387   LayerIdMap layer_id_map_;
 388
 389   std::vector<PictureLayerImpl*> picture_layers_;
 390   std::vector<LayerImpl*> layers_with_copy_output_request_;
 391
 392   // Persisted state for non-impl-side-painting.
 393   int scrolling_layer_id_from_previous_tree_;
 394
 395   // List of visible layers for the most recently prepared frame.
 396   LayerImplList render_surface_layer_list_;
 397   // After drawing the |render_surface_layer_list_| the areas in this region
 398   // would not be fully covered by opaque content.
 399   Region unoccluded_screen_space_region_;
 400
 401   bool contents_textures_purged_;
 402   bool viewport_size_invalid_;
 403   bool needs_update_draw_properties_;
 404
 405   // In impl-side painting mode, this is true when the tree may contain
 406   // structural differences relative to the active tree.
 407   bool needs_full_tree_sync_;
 408
 409   bool next_activation_forces_redraw_;
 410
 411   bool has_ever_been_drawn_;
 412
 413   ScopedPtrVector<SwapPromise> swap_promise_list_;
 414
 415   UIResourceRequestQueue ui_resource_request_queue_;
 416
 417   int render_surface_layer_list_id_;
 418
 419   // Whether or not Blink's viewport size was shrunk by the height of the top
 420   // controls at the time of the last layout.
 421   bool top_controls_shrink_blink_size_;
 422
 423   float top_controls_height_;
 424
 425   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
 426   // shown).
 427   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 428
 429   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 430
 431  private:
 432   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 433 };
 434
 435 }  // namespace cc
 436
 437 #endif  // CC_TREES_LAYER_TREE_IMPL_H_