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     property_trees_.transform_tree.set_source_to_parent_updates_allowed(false);
 135   }
 136   PropertyTrees* property_trees() { return &property_trees_; }
 137
 138   void UpdatePropertyTreesForBoundsDelta();
 139
 140   void PushPropertiesTo(LayerTreeImpl* tree_impl);
 141
 142   int source_frame_number() const { return source_frame_number_; }
 143   void set_source_frame_number(int frame_number) {
 144     source_frame_number_ = frame_number;
 145   }
 146
 147   HeadsUpDisplayLayerImpl* hud_layer() { return hud_layer_; }
 148   void set_hud_layer(HeadsUpDisplayLayerImpl* layer_impl) {
 149     hud_layer_ = layer_impl;
 150   }
 151
 152   LayerImpl* InnerViewportScrollLayer() const;
 153   // This function may return NULL, it is the caller's responsibility to check.
 154   LayerImpl* OuterViewportScrollLayer() const;
 155   gfx::ScrollOffset TotalScrollOffset() const;
 156   gfx::ScrollOffset TotalMaxScrollOffset() const;
 157
 158   LayerImpl* InnerViewportContainerLayer() const;
 159   LayerImpl* OuterViewportContainerLayer() const;
 160   LayerImpl* CurrentlyScrollingLayer() const;
 161   void SetCurrentlyScrollingLayer(LayerImpl* layer);
 162   void ClearCurrentlyScrollingLayer();
 163
 164   void SetViewportLayersFromIds(int overscroll_elasticity_layer,
 165                                 int page_scale_layer_id,
 166                                 int inner_viewport_scroll_layer_id,
 167                                 int outer_viewport_scroll_layer_id);
 168   void ClearViewportLayers();
 169   LayerImpl* OverscrollElasticityLayer() {
 170     return LayerById(overscroll_elasticity_layer_id_);
 171   }
 172   LayerImpl* PageScaleLayer() { return LayerById(page_scale_layer_id_); }
 173   void ApplySentScrollAndScaleDeltasFromAbortedCommit();
 174
 175   SkColor background_color() const { return background_color_; }
 176   void set_background_color(SkColor color) { background_color_ = color; }
 177
 178   bool has_transparent_background() const {
 179     return has_transparent_background_;
 180   }
 181   void set_has_transparent_background(bool transparent) {
 182     has_transparent_background_ = transparent;
 183   }
 184
 185   void UpdatePropertyTreeScrollingAndAnimationFromMainThread();
 186   void SetPageScaleOnActiveTree(float active_page_scale);
 187   void PushPageScaleFromMainThread(float page_scale_factor,
 188                                    float min_page_scale_factor,
 189                                    float max_page_scale_factor);
 190   float current_page_scale_factor() const {
 191     return page_scale_factor()->Current(IsActiveTree());
 192   }
 193   float min_page_scale_factor() const { return min_page_scale_factor_; }
 194   float max_page_scale_factor() const { return max_page_scale_factor_; }
 195
 196   float page_scale_delta() const { return page_scale_factor()->Delta(); }
 197
 198   SyncedProperty<ScaleGroup>* page_scale_factor();
 199   const SyncedProperty<ScaleGroup>* page_scale_factor() const;
 200
 201   void set_hide_pinch_scrollbars_near_min_scale(bool hide) {
 202     hide_pinch_scrollbars_near_min_scale_ = hide;
 203   }
 204
 205   SyncedElasticOverscroll* elastic_overscroll() {
 206     return elastic_overscroll_.get();
 207   }
 208   const SyncedElasticOverscroll* elastic_overscroll() const {
 209     return elastic_overscroll_.get();
 210   }
 211
 212   SyncedTopControls* top_controls_shown_ratio() {
 213     return top_controls_shown_ratio_.get();
 214   }
 215   const SyncedTopControls* top_controls_shown_ratio() const {
 216     return top_controls_shown_ratio_.get();
 217   }
 218
 219   // Updates draw properties and render surface layer list, as well as tile
 220   // priorities. Returns false if it was unable to update.  Updating lcd
 221   // text may cause invalidations, so should only be done after a commit.
 222   bool UpdateDrawProperties(bool update_lcd_text);
 223   void BuildPropertyTreesForTesting();
 224
 225   void set_needs_update_draw_properties() {
 226     needs_update_draw_properties_ = true;
 227   }
 228   bool needs_update_draw_properties() const {
 229     return needs_update_draw_properties_;
 230   }
 231
 232   void set_needs_full_tree_sync(bool needs) { needs_full_tree_sync_ = needs; }
 233   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
 234
 235   void ForceRedrawNextActivation() { next_activation_forces_redraw_ = true; }
 236
 237   void set_has_ever_been_drawn(bool has_drawn) {
 238     has_ever_been_drawn_ = has_drawn;
 239   }
 240   bool has_ever_been_drawn() const { return has_ever_been_drawn_; }
 241
 242   void set_ui_resource_request_queue(const UIResourceRequestQueue& queue);
 243
 244   const LayerImplList& RenderSurfaceLayerList() const;
 245   const Region& UnoccludedScreenSpaceRegion() const;
 246
 247   // These return the size of the root scrollable area and the size of
 248   // the user-visible scrolling viewport, in CSS layout coordinates.
 249   gfx::SizeF ScrollableSize() const;
 250   gfx::SizeF ScrollableViewportSize() const;
 251
 252   gfx::Rect RootScrollLayerDeviceViewportBounds() const;
 253
 254   LayerImpl* LayerById(int id) const;
 255
 256   // These should be called by LayerImpl's ctor/dtor.
 257   void RegisterLayer(LayerImpl* layer);
 258   void UnregisterLayer(LayerImpl* layer);
 259
 260   size_t NumLayers();
 261
 262   AnimationRegistrar* GetAnimationRegistrar() const;
 263
 264   void DidBecomeActive();
 265
 266   // Set on the active tree when the viewport size recently changed
 267   // and the active tree's size is now out of date.
 268   bool ViewportSizeInvalid() const;
 269   void SetViewportSizeInvalid();
 270   void ResetViewportSizeInvalid();
 271
 272   // Useful for debug assertions, probably shouldn't be used for anything else.
 273   Proxy* proxy() const;
 274
 275   void SetRootLayerScrollOffsetDelegate(
 276       LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate);
 277   void UpdateRootScrollOffsetDelegate();
 278   // Distribute the rool scroll between outer and inner viewport scroll layer.
 279   // The outer viewport scroll layer scrolls first.
 280   void DistributeRootScrollOffset();
 281
 282   void ApplyScroll(LayerImpl* layer, ScrollState* scroll_state) {
 283     layer_tree_host_impl_->ApplyScroll(layer, scroll_state);
 284   }
 285
 286   // Call this function when you expect there to be a swap buffer.
 287   // See swap_promise.h for how to use SwapPromise.
 288   //
 289   // A swap promise queued by QueueSwapPromise travels with the layer
 290   // information currently associated with the tree. For example, when
 291   // a pending tree is activated, the swap promise is passed to the
 292   // active tree along with the layer information. Similarly, when a
 293   // new activation overwrites layer information on the active tree,
 294   // queued swap promises are broken.
 295   void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 296
 297   // Queue a swap promise, pinned to this tree. Pinned swap promises
 298   // may only be queued on the active tree.
 299   //
 300   // An active tree pinned swap promise will see only DidSwap() or
 301   // DidNotSwap(SWAP_FAILS). No DidActivate() will be seen because
 302   // that has already happened prior to queueing of the swap promise.
 303   //
 304   // Pinned active tree swap promises will not be broken prematurely
 305   // on the active tree if a new tree is activated.
 306   void QueuePinnedSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 307
 308   // Take the |new_swap_promise| and append it to |swap_promise_list_|.
 309   void PassSwapPromises(ScopedPtrVector<SwapPromise>* new_swap_promise);
 310   void FinishSwapPromises(CompositorFrameMetadata* metadata);
 311   void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
 312
 313   void DidModifyTilePriorities();
 314
 315   ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 316   void ProcessUIResourceRequestQueue();
 317
 318   bool IsUIResourceOpaque(UIResourceId uid) const;
 319
 320   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 321   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 322   const std::vector<PictureLayerImpl*>& picture_layers() const {
 323     return picture_layers_;
 324   }
 325
 326   void AddLayerWithCopyOutputRequest(LayerImpl* layer);
 327   void RemoveLayerWithCopyOutputRequest(LayerImpl* layer);
 328   const std::vector<LayerImpl*>& LayersWithCopyOutputRequest() const;
 329
 330   int current_render_surface_list_id() const {
 331     return render_surface_layer_list_id_;
 332   }
 333
 334   LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
 335       const gfx::PointF& screen_space_point);
 336
 337   LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
 338
 339   LayerImpl* FindLayerWithWheelHandlerThatIsHitByPoint(
 340       const gfx::PointF& screen_space_point);
 341
 342   LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
 343       const gfx::PointF& screen_space_point);
 344
 345   void RegisterSelection(const LayerSelection& selection);
 346
 347   // Compute the current selection handle location and visbility with respect to
 348   // the viewport.
 349   void GetViewportSelection(ViewportSelection* selection);
 350
 351   void set_top_controls_shrink_blink_size(bool shrink);
 352   bool top_controls_shrink_blink_size() const {
 353     return top_controls_shrink_blink_size_;
 354   }
 355   bool SetCurrentTopControlsShownRatio(float ratio);
 356   float CurrentTopControlsShownRatio() const {
 357     return top_controls_shown_ratio_->Current(IsActiveTree());
 358   }
 359   void set_top_controls_height(float top_controls_height);
 360   float top_controls_height() const { return top_controls_height_; }
 361   void PushTopControlsFromMainThread(float top_controls_shown_ratio);
 362
 363   void SetPendingPageScaleAnimation(
 364       scoped_ptr<PendingPageScaleAnimation> pending_animation);
 365   scoped_ptr<PendingPageScaleAnimation> TakePendingPageScaleAnimation();
 366
 367   void GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids);
 368
 369   void DidUpdateScrollOffset(int layer_id);
 370
 371   bool IsAnimatingFilterProperty(const LayerImpl* layer) const;
 372   bool IsAnimatingOpacityProperty(const LayerImpl* layer) const;
 373   bool IsAnimatingTransformProperty(const LayerImpl* layer) const;
 374
 375   bool HasPotentiallyRunningFilterAnimation(const LayerImpl* layer) const;
 376   bool HasPotentiallyRunningOpacityAnimation(const LayerImpl* layer) const;
 377   bool HasPotentiallyRunningTransformAnimation(const LayerImpl* layer) const;
 378
 379   bool HasAnyAnimationTargetingProperty(
 380       const LayerImpl* layer,
 381       Animation::TargetProperty property) const;
 382
 383   bool FilterIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 384   bool OpacityIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 385   bool TransformIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 386
 387   bool HasOnlyTranslationTransforms(const LayerImpl* layer) const;
 388
 389   bool MaximumTargetScale(const LayerImpl* layer, float* max_scale) const;
 390   bool AnimationStartScale(const LayerImpl* layer, float* start_scale) const;
 391
 392   bool HasFilterAnimationThatInflatesBounds(const LayerImpl* layer) const;
 393   bool HasTransformAnimationThatInflatesBounds(const LayerImpl* layer) const;
 394   bool HasAnimationThatInflatesBounds(const LayerImpl* layer) const;
 395
 396   bool FilterAnimationBoundsForBox(const LayerImpl* layer,
 397                                    const gfx::BoxF& box,
 398                                    gfx::BoxF* bounds) const;
 399   bool TransformAnimationBoundsForBox(const LayerImpl* layer,
 400                                       const gfx::BoxF& box,
 401                                       gfx::BoxF* bounds) const;
 402
 403  protected:
 404   explicit LayerTreeImpl(
 405       LayerTreeHostImpl* layer_tree_host_impl,
 406       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
 407       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
 408       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll);
 409   float ClampPageScaleFactorToLimits(float page_scale_factor) const;
 410   void PushPageScaleFactorAndLimits(const float* page_scale_factor,
 411                                     float min_page_scale_factor,
 412                                     float max_page_scale_factor);
 413   bool SetPageScaleFactorLimits(float min_page_scale_factor,
 414                                 float max_page_scale_factor);
 415   void DidUpdatePageScale();
 416   void HideInnerViewportScrollbarsIfNeeded();
 417   void PushTopControls(const float* top_controls_shown_ratio);
 418   LayerTreeHostImpl* layer_tree_host_impl_;
 419   int source_frame_number_;
 420   scoped_ptr<LayerImpl> root_layer_;
 421   HeadsUpDisplayLayerImpl* hud_layer_;
 422   PropertyTrees property_trees_;
 423   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
 424   SkColor background_color_;
 425   bool has_transparent_background_;
 426
 427   int currently_scrolling_layer_id_;
 428   int overscroll_elasticity_layer_id_;
 429   int page_scale_layer_id_;
 430   int inner_viewport_scroll_layer_id_;
 431   int outer_viewport_scroll_layer_id_;
 432
 433   LayerSelection selection_;
 434
 435   scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor_;
 436   float min_page_scale_factor_;
 437   float max_page_scale_factor_;
 438   bool hide_pinch_scrollbars_near_min_scale_;
 439
 440   scoped_refptr<SyncedElasticOverscroll> elastic_overscroll_;
 441
 442   typedef base::hash_map<int, LayerImpl*> LayerIdMap;
 443   LayerIdMap layer_id_map_;
 444
 445   std::vector<PictureLayerImpl*> picture_layers_;
 446   std::vector<LayerImpl*> layers_with_copy_output_request_;
 447
 448   // List of visible layers for the most recently prepared frame.
 449   LayerImplList render_surface_layer_list_;
 450   // After drawing the |render_surface_layer_list_| the areas in this region
 451   // would not be fully covered by opaque content.
 452   Region unoccluded_screen_space_region_;
 453
 454   bool viewport_size_invalid_;
 455   bool needs_update_draw_properties_;
 456
 457   // In impl-side painting mode, this is true when the tree may contain
 458   // structural differences relative to the active tree.
 459   bool needs_full_tree_sync_;
 460
 461   bool next_activation_forces_redraw_;
 462
 463   bool has_ever_been_drawn_;
 464
 465   ScopedPtrVector<SwapPromise> swap_promise_list_;
 466   ScopedPtrVector<SwapPromise> pinned_swap_promise_list_;
 467
 468   UIResourceRequestQueue ui_resource_request_queue_;
 469
 470   int render_surface_layer_list_id_;
 471
 472   // Whether or not Blink's viewport size was shrunk by the height of the top
 473   // controls at the time of the last layout.
 474   bool top_controls_shrink_blink_size_;
 475
 476   float top_controls_height_;
 477
 478   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
 479   // shown).
 480   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 481
 482   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 483
 484  private:
 485   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 486 };
 487
 488 }  // namespace cc
 489
 490 #endif  // CC_TREES_LAYER_TREE_IMPL_H_