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 PictureLayerImpl;
  46 class Proxy;
  47 class ResourceProvider;
  48 class TileManager;
  49 class UIResourceRequest;
  50 class VideoFrameControllerClient;
  51 struct PendingPageScaleAnimation;
  52 struct RendererCapabilities;
  53
  54 typedef std::vector<UIResourceRequest> UIResourceRequestQueue;
  55 typedef SyncedProperty<AdditionGroup<float>> SyncedTopControls;
  56 typedef SyncedProperty<AdditionGroup<gfx::Vector2dF>> SyncedElasticOverscroll;
  57
  58 class CC_EXPORT LayerTreeImpl {
  59  public:
  60   static scoped_ptr<LayerTreeImpl> create(
  61       LayerTreeHostImpl* layer_tree_host_impl,
  62       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
  63       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
  64       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll) {
  65     return make_scoped_ptr(
  66         new LayerTreeImpl(layer_tree_host_impl, page_scale_factor,
  67                           top_controls_shown_ratio, elastic_overscroll));
  68   }
  69   virtual ~LayerTreeImpl();
  70
  71   void Shutdown();
  72   void ReleaseResources();
  73   void RecreateResources();
  74
  75   // Methods called by the layer tree that pass-through or access LTHI.
  76   // ---------------------------------------------------------------------------
  77   const LayerTreeSettings& settings() const;
  78   const LayerTreeDebugState& debug_state() const;
  79   const RendererCapabilitiesImpl& GetRendererCapabilities() const;
  80   ContextProvider* context_provider() const;
  81   OutputSurface* output_surface() const;
  82   ResourceProvider* resource_provider() const;
  83   TileManager* tile_manager() const;
  84   FrameRateCounter* frame_rate_counter() const;
  85   MemoryHistory* memory_history() const;
  86   gfx::Size device_viewport_size() const;
  87   float device_scale_factor() const;
  88   DebugRectHistory* debug_rect_history() const;
  89   bool IsActiveTree() const;
  90   bool IsPendingTree() const;
  91   bool IsRecycleTree() const;
  92   bool IsSyncTree() const;
  93   LayerImpl* FindActiveTreeLayerById(int id);
  94   LayerImpl* FindPendingTreeLayerById(int id);
  95   bool PinchGestureActive() const;
  96   BeginFrameArgs CurrentBeginFrameArgs() const;
  97   base::TimeDelta CurrentBeginFrameInterval() const;
  98   void SetNeedsCommit();
  99   gfx::Rect DeviceViewport() const;
 100   gfx::Size DrawViewportSize() const;
 101   const gfx::Rect ViewportRectForTilePriority() const;
 102   scoped_ptr<ScrollbarAnimationController> CreateScrollbarAnimationController(
 103       LayerImpl* scrolling_layer);
 104   void DidAnimateScrollOffset();
 105   void InputScrollAnimationFinished();
 106   bool use_gpu_rasterization() const;
 107   GpuRasterizationStatus GetGpuRasterizationStatus() const;
 108   bool create_low_res_tiling() const;
 109   BlockingTaskRunner* BlockingMainThreadTaskRunner() const;
 110   bool RequiresHighResToDraw() const;
 111   bool SmoothnessTakesPriority() const;
 112   VideoFrameControllerClient* GetVideoFrameControllerClient() const;
 113
 114   // Tree specific methods exposed to layer-impl tree.
 115   // ---------------------------------------------------------------------------
 116   void SetNeedsRedraw();
 117
 118   // Tracing methods.
 119   // ---------------------------------------------------------------------------
 120   void GetAllPrioritizedTilesForTracing(
 121       std::vector<PrioritizedTile>* prioritized_tiles) const;
 122   void AsValueInto(base::trace_event::TracedValue* dict) const;
 123
 124   // Other public methods
 125   // ---------------------------------------------------------------------------
 126   LayerImpl* root_layer() const { return root_layer_.get(); }
 127   void SetRootLayer(scoped_ptr<LayerImpl>);
 128   scoped_ptr<LayerImpl> DetachLayerTree();
 129
 130   void SetPropertyTrees(const PropertyTrees& property_trees) {
 131     property_trees_ = property_trees;
 132     property_trees_.transform_tree.set_source_to_parent_updates_allowed(false);
 133   }
 134   PropertyTrees* property_trees() { return &property_trees_; }
 135
 136   void UpdatePropertyTreesForBoundsDelta();
 137
 138   void PushPropertiesTo(LayerTreeImpl* tree_impl);
 139
 140   int source_frame_number() const { return source_frame_number_; }
 141   void set_source_frame_number(int frame_number) {
 142     source_frame_number_ = frame_number;
 143   }
 144
 145   HeadsUpDisplayLayerImpl* hud_layer() { return hud_layer_; }
 146   void set_hud_layer(HeadsUpDisplayLayerImpl* layer_impl) {
 147     hud_layer_ = layer_impl;
 148   }
 149
 150   LayerImpl* InnerViewportScrollLayer() const;
 151   // This function may return NULL, it is the caller's responsibility to check.
 152   LayerImpl* OuterViewportScrollLayer() const;
 153   gfx::ScrollOffset TotalScrollOffset() const;
 154   gfx::ScrollOffset TotalMaxScrollOffset() const;
 155
 156   LayerImpl* InnerViewportContainerLayer() const;
 157   LayerImpl* OuterViewportContainerLayer() const;
 158   LayerImpl* CurrentlyScrollingLayer() const;
 159   void SetCurrentlyScrollingLayer(LayerImpl* layer);
 160   void ClearCurrentlyScrollingLayer();
 161
 162   void SetViewportLayersFromIds(int overscroll_elasticity_layer,
 163                                 int page_scale_layer_id,
 164                                 int inner_viewport_scroll_layer_id,
 165                                 int outer_viewport_scroll_layer_id);
 166   void ClearViewportLayers();
 167   LayerImpl* OverscrollElasticityLayer() {
 168     return LayerById(overscroll_elasticity_layer_id_);
 169   }
 170   LayerImpl* PageScaleLayer() { return LayerById(page_scale_layer_id_); }
 171   void ApplySentScrollAndScaleDeltasFromAbortedCommit();
 172
 173   SkColor background_color() const { return background_color_; }
 174   void set_background_color(SkColor color) { background_color_ = color; }
 175
 176   bool has_transparent_background() const {
 177     return has_transparent_background_;
 178   }
 179   void set_has_transparent_background(bool transparent) {
 180     has_transparent_background_ = transparent;
 181   }
 182
 183   void UpdatePropertyTreeScrollingAndAnimationFromMainThread();
 184   void SetPageScaleOnActiveTree(float active_page_scale);
 185   void PushPageScaleFromMainThread(float page_scale_factor,
 186                                    float min_page_scale_factor,
 187                                    float max_page_scale_factor);
 188   float current_page_scale_factor() const {
 189     return page_scale_factor()->Current(IsActiveTree());
 190   }
 191   float min_page_scale_factor() const { return min_page_scale_factor_; }
 192   float max_page_scale_factor() const { return max_page_scale_factor_; }
 193
 194   float page_scale_delta() const { return page_scale_factor()->Delta(); }
 195
 196   SyncedProperty<ScaleGroup>* page_scale_factor();
 197   const SyncedProperty<ScaleGroup>* page_scale_factor() const;
 198
 199   void set_hide_pinch_scrollbars_near_min_scale(bool hide) {
 200     hide_pinch_scrollbars_near_min_scale_ = hide;
 201   }
 202
 203   SyncedElasticOverscroll* elastic_overscroll() {
 204     return elastic_overscroll_.get();
 205   }
 206   const SyncedElasticOverscroll* elastic_overscroll() const {
 207     return elastic_overscroll_.get();
 208   }
 209
 210   SyncedTopControls* top_controls_shown_ratio() {
 211     return top_controls_shown_ratio_.get();
 212   }
 213   const SyncedTopControls* top_controls_shown_ratio() const {
 214     return top_controls_shown_ratio_.get();
 215   }
 216
 217   // Updates draw properties and render surface layer list, as well as tile
 218   // priorities. Returns false if it was unable to update.  Updating lcd
 219   // text may cause invalidations, so should only be done after a commit.
 220   bool UpdateDrawProperties(bool update_lcd_text);
 221   void BuildPropertyTreesForTesting();
 222
 223   void set_needs_update_draw_properties() {
 224     needs_update_draw_properties_ = true;
 225   }
 226   bool needs_update_draw_properties() const {
 227     return needs_update_draw_properties_;
 228   }
 229
 230   void set_needs_full_tree_sync(bool needs) { needs_full_tree_sync_ = needs; }
 231   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
 232
 233   void ForceRedrawNextActivation() { next_activation_forces_redraw_ = true; }
 234
 235   void set_has_ever_been_drawn(bool has_drawn) {
 236     has_ever_been_drawn_ = has_drawn;
 237   }
 238   bool has_ever_been_drawn() const { return has_ever_been_drawn_; }
 239
 240   void set_ui_resource_request_queue(const UIResourceRequestQueue& queue);
 241
 242   const LayerImplList& RenderSurfaceLayerList() const;
 243   const Region& UnoccludedScreenSpaceRegion() const;
 244
 245   // These return the size of the root scrollable area and the size of
 246   // the user-visible scrolling viewport, in CSS layout coordinates.
 247   gfx::SizeF ScrollableSize() const;
 248   gfx::SizeF ScrollableViewportSize() const;
 249
 250   gfx::Rect RootScrollLayerDeviceViewportBounds() const;
 251
 252   LayerImpl* LayerById(int id) const;
 253
 254   // These should be called by LayerImpl's ctor/dtor.
 255   void RegisterLayer(LayerImpl* layer);
 256   void UnregisterLayer(LayerImpl* layer);
 257
 258   size_t NumLayers();
 259
 260   AnimationRegistrar* GetAnimationRegistrar() const;
 261
 262   void DidBecomeActive();
 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   // Distribute the root scroll between outer and inner viewport scroll layer.
 274   // The outer viewport scroll layer scrolls first.
 275   void DistributeRootScrollOffset(const gfx::ScrollOffset& root_offset);
 276
 277   void ApplyScroll(LayerImpl* layer, ScrollState* scroll_state) {
 278     layer_tree_host_impl_->ApplyScroll(layer, scroll_state);
 279   }
 280
 281   // Call this function when you expect there to be a swap buffer.
 282   // See swap_promise.h for how to use SwapPromise.
 283   //
 284   // A swap promise queued by QueueSwapPromise travels with the layer
 285   // information currently associated with the tree. For example, when
 286   // a pending tree is activated, the swap promise is passed to the
 287   // active tree along with the layer information. Similarly, when a
 288   // new activation overwrites layer information on the active tree,
 289   // queued swap promises are broken.
 290   void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 291
 292   // Queue a swap promise, pinned to this tree. Pinned swap promises
 293   // may only be queued on the active tree.
 294   //
 295   // An active tree pinned swap promise will see only DidSwap() or
 296   // DidNotSwap(SWAP_FAILS). No DidActivate() will be seen because
 297   // that has already happened prior to queueing of the swap promise.
 298   //
 299   // Pinned active tree swap promises will not be broken prematurely
 300   // on the active tree if a new tree is activated.
 301   void QueuePinnedSwapPromise(scoped_ptr<SwapPromise> swap_promise);
 302
 303   // Take the |new_swap_promise| and append it to |swap_promise_list_|.
 304   void PassSwapPromises(ScopedPtrVector<SwapPromise>* new_swap_promise);
 305   void FinishSwapPromises(CompositorFrameMetadata* metadata);
 306   void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
 307
 308   void DidModifyTilePriorities();
 309
 310   ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 311   void ProcessUIResourceRequestQueue();
 312
 313   bool IsUIResourceOpaque(UIResourceId uid) const;
 314
 315   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
 316   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 317   const std::vector<PictureLayerImpl*>& picture_layers() const {
 318     return picture_layers_;
 319   }
 320
 321   void AddLayerWithCopyOutputRequest(LayerImpl* layer);
 322   void RemoveLayerWithCopyOutputRequest(LayerImpl* layer);
 323   const std::vector<LayerImpl*>& LayersWithCopyOutputRequest() const;
 324
 325   int current_render_surface_list_id() const {
 326     return render_surface_layer_list_id_;
 327   }
 328
 329   LayerImpl* FindFirstScrollingLayerThatIsHitByPoint(
 330       const gfx::PointF& screen_space_point);
 331
 332   LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
 333
 334   LayerImpl* FindLayerWithWheelHandlerThatIsHitByPoint(
 335       const gfx::PointF& screen_space_point);
 336
 337   LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
 338       const gfx::PointF& screen_space_point);
 339
 340   void RegisterSelection(const LayerSelection& selection);
 341
 342   // Compute the current selection handle location and visbility with respect to
 343   // the viewport.
 344   void GetViewportSelection(ViewportSelection* selection);
 345
 346   void set_top_controls_shrink_blink_size(bool shrink);
 347   bool top_controls_shrink_blink_size() const {
 348     return top_controls_shrink_blink_size_;
 349   }
 350   bool SetCurrentTopControlsShownRatio(float ratio);
 351   float CurrentTopControlsShownRatio() const {
 352     return top_controls_shown_ratio_->Current(IsActiveTree());
 353   }
 354   void set_top_controls_height(float top_controls_height);
 355   float top_controls_height() const { return top_controls_height_; }
 356   void PushTopControlsFromMainThread(float top_controls_shown_ratio);
 357
 358   void SetPendingPageScaleAnimation(
 359       scoped_ptr<PendingPageScaleAnimation> pending_animation);
 360   scoped_ptr<PendingPageScaleAnimation> TakePendingPageScaleAnimation();
 361
 362   void GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids);
 363
 364   bool IsAnimatingFilterProperty(const LayerImpl* layer) const;
 365   bool IsAnimatingOpacityProperty(const LayerImpl* layer) const;
 366   bool IsAnimatingTransformProperty(const LayerImpl* layer) const;
 367
 368   bool HasPotentiallyRunningFilterAnimation(const LayerImpl* layer) const;
 369   bool HasPotentiallyRunningOpacityAnimation(const LayerImpl* layer) const;
 370   bool HasPotentiallyRunningTransformAnimation(const LayerImpl* layer) const;
 371
 372   bool HasAnyAnimationTargetingProperty(
 373       const LayerImpl* layer,
 374       Animation::TargetProperty property) const;
 375
 376   bool FilterIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 377   bool OpacityIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 378   bool TransformIsAnimatingOnImplOnly(const LayerImpl* layer) const;
 379
 380   bool HasOnlyTranslationTransforms(const LayerImpl* layer) const;
 381
 382   bool MaximumTargetScale(const LayerImpl* layer, float* max_scale) const;
 383   bool AnimationStartScale(const LayerImpl* layer, float* start_scale) const;
 384
 385   bool HasFilterAnimationThatInflatesBounds(const LayerImpl* layer) const;
 386   bool HasTransformAnimationThatInflatesBounds(const LayerImpl* layer) const;
 387   bool HasAnimationThatInflatesBounds(const LayerImpl* layer) const;
 388
 389   bool FilterAnimationBoundsForBox(const LayerImpl* layer,
 390                                    const gfx::BoxF& box,
 391                                    gfx::BoxF* bounds) const;
 392   bool TransformAnimationBoundsForBox(const LayerImpl* layer,
 393                                       const gfx::BoxF& box,
 394                                       gfx::BoxF* bounds) const;
 395
 396  protected:
 397   explicit LayerTreeImpl(
 398       LayerTreeHostImpl* layer_tree_host_impl,
 399       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
 400       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
 401       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll);
 402   float ClampPageScaleFactorToLimits(float page_scale_factor) const;
 403   void PushPageScaleFactorAndLimits(const float* page_scale_factor,
 404                                     float min_page_scale_factor,
 405                                     float max_page_scale_factor);
 406   bool SetPageScaleFactorLimits(float min_page_scale_factor,
 407                                 float max_page_scale_factor);
 408   void DidUpdatePageScale();
 409   void HideInnerViewportScrollbarsIfNeeded();
 410   void PushTopControls(const float* top_controls_shown_ratio);
 411   LayerTreeHostImpl* layer_tree_host_impl_;
 412   int source_frame_number_;
 413   scoped_ptr<LayerImpl> root_layer_;
 414   HeadsUpDisplayLayerImpl* hud_layer_;
 415   PropertyTrees property_trees_;
 416   SkColor background_color_;
 417   bool has_transparent_background_;
 418
 419   int currently_scrolling_layer_id_;
 420   int overscroll_elasticity_layer_id_;
 421   int page_scale_layer_id_;
 422   int inner_viewport_scroll_layer_id_;
 423   int outer_viewport_scroll_layer_id_;
 424
 425   LayerSelection selection_;
 426
 427   scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor_;
 428   float min_page_scale_factor_;
 429   float max_page_scale_factor_;
 430   bool hide_pinch_scrollbars_near_min_scale_;
 431
 432   scoped_refptr<SyncedElasticOverscroll> elastic_overscroll_;
 433
 434   typedef base::hash_map<int, LayerImpl*> LayerIdMap;
 435   LayerIdMap layer_id_map_;
 436
 437   std::vector<PictureLayerImpl*> picture_layers_;
 438   std::vector<LayerImpl*> layers_with_copy_output_request_;
 439
 440   // List of visible layers for the most recently prepared frame.
 441   LayerImplList render_surface_layer_list_;
 442   // After drawing the |render_surface_layer_list_| the areas in this region
 443   // would not be fully covered by opaque content.
 444   Region unoccluded_screen_space_region_;
 445
 446   bool viewport_size_invalid_;
 447   bool needs_update_draw_properties_;
 448
 449   // In impl-side painting mode, this is true when the tree may contain
 450   // structural differences relative to the active tree.
 451   bool needs_full_tree_sync_;
 452
 453   bool next_activation_forces_redraw_;
 454
 455   bool has_ever_been_drawn_;
 456
 457   ScopedPtrVector<SwapPromise> swap_promise_list_;
 458   ScopedPtrVector<SwapPromise> pinned_swap_promise_list_;
 459
 460   UIResourceRequestQueue ui_resource_request_queue_;
 461
 462   int render_surface_layer_list_id_;
 463
 464   // Whether or not Blink's viewport size was shrunk by the height of the top
 465   // controls at the time of the last layout.
 466   bool top_controls_shrink_blink_size_;
 467
 468   float top_controls_height_;
 469
 470   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
 471   // shown).
 472   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 473
 474   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 475
 476  private:
 477   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 478 };
 479
 480 }  // namespace cc
 481
 482 #endif  // CC_TREES_LAYER_TREE_IMPL_H_