cc/layers/layer_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_LAYERS_LAYER_IMPL_H_
   6 #define CC_LAYERS_LAYER_IMPL_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/logging.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/values.h"
  14 #include "cc/animation/animation_delegate.h"
  15 #include "cc/animation/layer_animation_controller.h"
  16 #include "cc/animation/layer_animation_value_observer.h"
  17 #include "cc/animation/layer_animation_value_provider.h"
  18 #include "cc/base/cc_export.h"
  19 #include "cc/base/region.h"
  20 #include "cc/base/scoped_ptr_vector.h"
  21 #include "cc/input/input_handler.h"
  22 #include "cc/layers/draw_properties.h"
  23 #include "cc/layers/layer_lists.h"
  24 #include "cc/layers/layer_position_constraint.h"
  25 #include "cc/layers/render_surface_impl.h"
  26 #include "cc/output/filter_operations.h"
  27 #include "cc/quads/render_pass.h"
  28 #include "cc/quads/shared_quad_state.h"
  29 #include "cc/resources/resource_provider.h"
  30 #include "skia/ext/refptr.h"
  31 #include "third_party/skia/include/core/SkColor.h"
  32 #include "third_party/skia/include/core/SkImageFilter.h"
  33 #include "third_party/skia/include/core/SkPicture.h"
  34 #include "ui/gfx/point3_f.h"
  35 #include "ui/gfx/rect.h"
  36 #include "ui/gfx/rect_f.h"
  37 #include "ui/gfx/transform.h"
  38
  39 namespace base {
  40 namespace debug {
  41 class ConvertableToTraceFormat;
  42 }
  43
  44 class DictionaryValue;
  45 }
  46
  47 namespace cc {
  48
  49 class LayerTreeHostImpl;
  50 class LayerTreeImpl;
  51 class MicroBenchmarkImpl;
  52 template <typename LayerType>
  53 class OcclusionTracker;
  54 class Renderer;
  55 class ScrollbarAnimationController;
  56 class ScrollbarLayerImplBase;
  57 class Tile;
  58
  59 struct AppendQuadsData;
  60
  61 enum DrawMode {
  62   DRAW_MODE_NONE,
  63   DRAW_MODE_HARDWARE,
  64   DRAW_MODE_SOFTWARE,
  65   DRAW_MODE_RESOURCELESS_SOFTWARE
  66 };
  67
  68 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
  69                             public LayerAnimationValueProvider,
  70                             public AnimationDelegate {
  71  public:
  72   // Allows for the ownership of the total scroll offset to be delegated outside
  73   // of the layer.
  74   class ScrollOffsetDelegate {
  75    public:
  76     virtual void SetTotalScrollOffset(const gfx::Vector2dF& new_value) = 0;
  77     virtual gfx::Vector2dF GetTotalScrollOffset() = 0;
  78     virtual bool IsExternalFlingActive() const = 0;
  79   };
  80
  81   typedef LayerImplList RenderSurfaceListType;
  82   typedef LayerImplList LayerListType;
  83   typedef RenderSurfaceImpl RenderSurfaceType;
  84
  85   enum RenderingContextConstants { NO_RENDERING_CONTEXT = 0 };
  86
  87   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
  88     return make_scoped_ptr(new LayerImpl(tree_impl, id));
  89   }
  90
  91   virtual ~LayerImpl();
  92
  93   int id() const { return layer_id_; }
  94
  95   // LayerAnimationValueProvider implementation.
  96   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
  97
  98   // LayerAnimationValueObserver implementation.
  99   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
 100   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
 101   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
 102   virtual void OnScrollOffsetAnimated(
 103       const gfx::Vector2dF& scroll_offset) OVERRIDE;
 104   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
 105   virtual bool IsActive() const OVERRIDE;
 106
 107   // AnimationDelegate implementation.
 108   virtual void NotifyAnimationStarted(
 109       base::TimeTicks monotonic_time,
 110       Animation::TargetProperty target_property) OVERRIDE{};
 111   virtual void NotifyAnimationFinished(
 112       base::TimeTicks monotonic_time,
 113       Animation::TargetProperty target_property) OVERRIDE;
 114
 115   // Tree structure.
 116   LayerImpl* parent() { return parent_; }
 117   const LayerImpl* parent() const { return parent_; }
 118   const OwnedLayerImplList& children() const { return children_; }
 119   OwnedLayerImplList& children() { return children_; }
 120   LayerImpl* child_at(size_t index) const { return children_[index]; }
 121   void AddChild(scoped_ptr<LayerImpl> child);
 122   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
 123   void SetParent(LayerImpl* parent);
 124
 125   // Warning: This does not preserve tree structure invariants.
 126   void ClearChildList();
 127
 128   bool HasAncestor(const LayerImpl* ancestor) const;
 129
 130   void SetScrollParent(LayerImpl* parent);
 131
 132   LayerImpl* scroll_parent() { return scroll_parent_; }
 133   const LayerImpl* scroll_parent() const { return scroll_parent_; }
 134
 135   void SetScrollChildren(std::set<LayerImpl*>* children);
 136
 137   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 138   const std::set<LayerImpl*>* scroll_children() const {
 139     return scroll_children_.get();
 140   }
 141
 142   void SetClipParent(LayerImpl* ancestor);
 143
 144   LayerImpl* clip_parent() {
 145     return clip_parent_;
 146   }
 147   const LayerImpl* clip_parent() const {
 148     return clip_parent_;
 149   }
 150
 151   void SetClipChildren(std::set<LayerImpl*>* children);
 152
 153   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 154   const std::set<LayerImpl*>* clip_children() const {
 155     return clip_children_.get();
 156   }
 157
 158   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 159   // Can only be called when the layer has a copy request.
 160   void TakeCopyRequestsAndTransformToTarget(
 161       ScopedPtrVector<CopyOutputRequest>* request);
 162   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 163
 164   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 165   LayerImpl* mask_layer() { return mask_layer_.get(); }
 166   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 167   scoped_ptr<LayerImpl> TakeMaskLayer();
 168
 169   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 170   LayerImpl* replica_layer() { return replica_layer_.get(); }
 171   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 172   scoped_ptr<LayerImpl> TakeReplicaLayer();
 173
 174   bool has_mask() const { return mask_layer_; }
 175   bool has_replica() const { return replica_layer_; }
 176   bool replica_has_mask() const {
 177     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 178   }
 179
 180   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 181
 182   void PopulateSharedQuadState(SharedQuadState* state) const;
 183   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 184   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 185   // DidDraw is guaranteed to be called before another WillDraw or before
 186   // the layer is destroyed. To enforce this, any class that overrides
 187   // WillDraw/DidDraw must call the base class version only if WillDraw
 188   // returns true.
 189   virtual bool WillDraw(DrawMode draw_mode,
 190                         ResourceProvider* resource_provider);
 191   virtual void AppendQuads(RenderPass* render_pass,
 192                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
 193                            AppendQuadsData* append_quads_data) {}
 194   virtual void DidDraw(ResourceProvider* resource_provider);
 195
 196   virtual ResourceProvider::ResourceId ContentsResourceId() const;
 197
 198   virtual bool HasDelegatedContent() const;
 199   virtual bool HasContributingDelegatedRenderPasses() const;
 200   virtual RenderPass::Id FirstContributingRenderPassId() const;
 201   virtual RenderPass::Id NextContributingRenderPassId(RenderPass::Id id) const;
 202
 203   virtual void UpdateTiles(
 204       const OcclusionTracker<LayerImpl>* occlusion_tracker) {}
 205   virtual void NotifyTileStateChanged(const Tile* tile) {}
 206
 207   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 208
 209   // Returns true if this layer has content to draw.
 210   void SetDrawsContent(bool draws_content);
 211   bool DrawsContent() const { return draws_content_; }
 212
 213   void SetHideLayerAndSubtree(bool hide);
 214   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 215
 216   bool force_render_surface() const { return force_render_surface_; }
 217   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 218
 219   void SetTransformOrigin(const gfx::Point3F& transform_origin);
 220   gfx::Point3F transform_origin() const { return transform_origin_; }
 221
 222   void SetBackgroundColor(SkColor background_color);
 223   SkColor background_color() const { return background_color_; }
 224   // If contents_opaque(), return an opaque color else return a
 225   // non-opaque color.  Tries to return background_color(), if possible.
 226   SkColor SafeOpaqueBackgroundColor() const;
 227
 228   void SetFilters(const FilterOperations& filters);
 229   const FilterOperations& filters() const { return filters_; }
 230   bool FilterIsAnimating() const;
 231   bool FilterIsAnimatingOnImplOnly() const;
 232
 233   void SetBackgroundFilters(const FilterOperations& filters);
 234   const FilterOperations& background_filters() const {
 235     return background_filters_;
 236   }
 237
 238   void SetMasksToBounds(bool masks_to_bounds);
 239   bool masks_to_bounds() const { return masks_to_bounds_; }
 240
 241   void SetContentsOpaque(bool opaque);
 242   bool contents_opaque() const { return contents_opaque_; }
 243
 244   void SetOpacity(float opacity);
 245   float opacity() const { return opacity_; }
 246   bool OpacityIsAnimating() const;
 247   bool OpacityIsAnimatingOnImplOnly() const;
 248
 249   void SetBlendMode(SkXfermode::Mode);
 250   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 251   bool uses_default_blend_mode() const {
 252     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 253   }
 254
 255   void SetIsRootForIsolatedGroup(bool root);
 256   bool is_root_for_isolated_group() const {
 257     return is_root_for_isolated_group_;
 258   }
 259
 260   void SetPosition(const gfx::PointF& position);
 261   gfx::PointF position() const { return position_; }
 262
 263   void SetIsContainerForFixedPositionLayers(bool container) {
 264     is_container_for_fixed_position_layers_ = container;
 265   }
 266   // This is a non-trivial function in Layer.
 267   bool IsContainerForFixedPositionLayers() const {
 268     return is_container_for_fixed_position_layers_;
 269   }
 270
 271   gfx::Vector2dF FixedContainerSizeDelta() const;
 272
 273   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 274     position_constraint_ = constraint;
 275   }
 276   const LayerPositionConstraint& position_constraint() const {
 277     return position_constraint_;
 278   }
 279
 280   void SetShouldFlattenTransform(bool flatten);
 281   bool should_flatten_transform() const { return should_flatten_transform_; }
 282
 283   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 284
 285   void SetUseParentBackfaceVisibility(bool use) {
 286     use_parent_backface_visibility_ = use;
 287   }
 288   bool use_parent_backface_visibility() const {
 289     return use_parent_backface_visibility_;
 290   }
 291
 292   bool ShowDebugBorders() const;
 293
 294   // These invalidate the host's render surface layer list.  The caller
 295   // is responsible for calling set_needs_update_draw_properties on the tree
 296   // so that its list can be recreated.
 297   void CreateRenderSurface();
 298   void ClearRenderSurface();
 299   void ClearRenderSurfaceLayerList();
 300
 301   DrawProperties<LayerImpl>& draw_properties() {
 302     return draw_properties_;
 303   }
 304   const DrawProperties<LayerImpl>& draw_properties() const {
 305     return draw_properties_;
 306   }
 307
 308   // The following are shortcut accessors to get various information from
 309   // draw_properties_
 310   const gfx::Transform& draw_transform() const {
 311     return draw_properties_.target_space_transform;
 312   }
 313   const gfx::Transform& screen_space_transform() const {
 314     return draw_properties_.screen_space_transform;
 315   }
 316   float draw_opacity() const { return draw_properties_.opacity; }
 317   bool draw_opacity_is_animating() const {
 318     return draw_properties_.opacity_is_animating;
 319   }
 320   bool draw_transform_is_animating() const {
 321     return draw_properties_.target_space_transform_is_animating;
 322   }
 323   bool screen_space_transform_is_animating() const {
 324     return draw_properties_.screen_space_transform_is_animating;
 325   }
 326   bool screen_space_opacity_is_animating() const {
 327     return draw_properties_.screen_space_opacity_is_animating;
 328   }
 329   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 330   bool is_clipped() const { return draw_properties_.is_clipped; }
 331   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 332   gfx::Rect drawable_content_rect() const {
 333     return draw_properties_.drawable_content_rect;
 334   }
 335   gfx::Rect visible_content_rect() const {
 336     return draw_properties_.visible_content_rect;
 337   }
 338   LayerImpl* render_target() {
 339     DCHECK(!draw_properties_.render_target ||
 340            draw_properties_.render_target->render_surface());
 341     return draw_properties_.render_target;
 342   }
 343   const LayerImpl* render_target() const {
 344     DCHECK(!draw_properties_.render_target ||
 345            draw_properties_.render_target->render_surface());
 346     return draw_properties_.render_target;
 347   }
 348   RenderSurfaceImpl* render_surface() const {
 349     return draw_properties_.render_surface.get();
 350   }
 351   int num_unclipped_descendants() const {
 352     return draw_properties_.num_unclipped_descendants;
 353   }
 354
 355   // The client should be responsible for setting bounds, content bounds and
 356   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 357   // them from the other values.
 358
 359   void SetBounds(const gfx::Size& bounds);
 360   void SetTemporaryImplBounds(const gfx::SizeF& bounds);
 361   gfx::Size bounds() const;
 362   gfx::Vector2dF BoundsDelta() const {
 363     return gfx::Vector2dF(temporary_impl_bounds_.width() - bounds_.width(),
 364                           temporary_impl_bounds_.height() - bounds_.height());
 365   }
 366
 367   void SetContentBounds(const gfx::Size& content_bounds);
 368   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 369
 370   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 371   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 372   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 373
 374   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
 375   bool IsExternalFlingActive() const;
 376
 377   void SetScrollOffset(const gfx::Vector2d& scroll_offset);
 378   void SetScrollOffsetAndDelta(const gfx::Vector2d& scroll_offset,
 379                                const gfx::Vector2dF& scroll_delta);
 380   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
 381
 382   gfx::Vector2d MaxScrollOffset() const;
 383   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 384   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 385                             LayerImpl* scrollbar_clip_layer) const;
 386   void SetScrollDelta(const gfx::Vector2dF& scroll_delta);
 387   gfx::Vector2dF ScrollDelta() const;
 388
 389   gfx::Vector2dF TotalScrollOffset() const;
 390
 391   void SetSentScrollDelta(const gfx::Vector2d& sent_scroll_delta);
 392   gfx::Vector2d sent_scroll_delta() const { return sent_scroll_delta_; }
 393
 394   // Returns the delta of the scroll that was outside of the bounds of the
 395   // initial scroll
 396   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 397
 398   void SetScrollClipLayer(int scroll_clip_layer_id);
 399   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 400   bool scrollable() const { return !!scroll_clip_layer_; }
 401
 402   void set_user_scrollable_horizontal(bool scrollable) {
 403     user_scrollable_horizontal_ = scrollable;
 404   }
 405   void set_user_scrollable_vertical(bool scrollable) {
 406     user_scrollable_vertical_ = scrollable;
 407   }
 408
 409   void ApplySentScrollDeltasFromAbortedCommit();
 410   void ApplyScrollDeltasSinceBeginMainFrame();
 411
 412   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 413     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 414   }
 415   bool should_scroll_on_main_thread() const {
 416     return should_scroll_on_main_thread_;
 417   }
 418
 419   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 420     have_wheel_event_handlers_ = have_wheel_event_handlers;
 421   }
 422   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 423
 424   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 425     have_scroll_event_handlers_ = have_scroll_event_handlers;
 426   }
 427   bool have_scroll_event_handlers() const {
 428     return have_scroll_event_handlers_;
 429   }
 430
 431   void SetNonFastScrollableRegion(const Region& region) {
 432     non_fast_scrollable_region_ = region;
 433   }
 434   const Region& non_fast_scrollable_region() const {
 435     return non_fast_scrollable_region_;
 436   }
 437
 438   void SetTouchEventHandlerRegion(const Region& region) {
 439     touch_event_handler_region_ = region;
 440   }
 441   const Region& touch_event_handler_region() const {
 442     return touch_event_handler_region_;
 443   }
 444
 445   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 446     draw_checkerboard_for_missing_tiles_ = checkerboard;
 447   }
 448   bool draw_checkerboard_for_missing_tiles() const {
 449     return draw_checkerboard_for_missing_tiles_;
 450   }
 451
 452   InputHandler::ScrollStatus TryScroll(
 453       const gfx::PointF& screen_space_point,
 454       InputHandler::ScrollInputType type) const;
 455
 456   void SetDoubleSided(bool double_sided);
 457   bool double_sided() const { return double_sided_; }
 458
 459   void SetTransform(const gfx::Transform& transform);
 460   const gfx::Transform& transform() const { return transform_; }
 461   bool TransformIsAnimating() const;
 462   bool TransformIsAnimatingOnImplOnly() const;
 463   void SetTransformAndInvertibility(const gfx::Transform& transform,
 464                                     bool transform_is_invertible);
 465   bool transform_is_invertible() const { return transform_is_invertible_; }
 466
 467   // Note this rect is in layer space (not content space).
 468   void SetUpdateRect(const gfx::RectF& update_rect);
 469
 470   const gfx::RectF& update_rect() const { return update_rect_; }
 471
 472   void AddDamageRect(const gfx::RectF& damage_rect);
 473
 474   const gfx::RectF& damage_rect() const { return damage_rect_; }
 475
 476   virtual base::DictionaryValue* LayerTreeAsJson() const;
 477
 478   void SetStackingOrderChanged(bool stacking_order_changed);
 479
 480   bool LayerPropertyChanged() const { return layer_property_changed_; }
 481
 482   void ResetAllChangeTrackingForSubtree();
 483
 484   LayerAnimationController* layer_animation_controller() {
 485     return layer_animation_controller_.get();
 486   }
 487
 488   const LayerAnimationController* layer_animation_controller() const {
 489     return layer_animation_controller_.get();
 490   }
 491
 492   virtual Region VisibleContentOpaqueRegion() const;
 493
 494   virtual void DidBecomeActive();
 495
 496   virtual void DidBeginTracing();
 497
 498   // Release resources held by this layer. Called when the output surface
 499   // that rendered this layer was lost or a rendering mode switch has occured.
 500   virtual void ReleaseResources();
 501
 502   ScrollbarAnimationController* scrollbar_animation_controller() const {
 503     return scrollbar_animation_controller_.get();
 504   }
 505
 506   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 507   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 508   void ClearScrollbars();
 509   void AddScrollbar(ScrollbarLayerImplBase* layer);
 510   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 511   bool HasScrollbar(ScrollbarOrientation orientation) const;
 512   void ScrollbarParametersDidChange();
 513   int clip_height() {
 514     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 515   }
 516
 517   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 518
 519   virtual skia::RefPtr<SkPicture> GetPicture();
 520
 521   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 522   virtual void PushPropertiesTo(LayerImpl* layer);
 523
 524   scoped_ptr<base::Value> AsValue() const;
 525   virtual size_t GPUMemoryUsageInBytes() const;
 526
 527   void SetNeedsPushProperties();
 528   void AddDependentNeedsPushProperties();
 529   void RemoveDependentNeedsPushProperties();
 530   bool parent_should_know_need_push_properties() const {
 531     return needs_push_properties() || descendant_needs_push_properties();
 532   }
 533
 534   bool needs_push_properties() const { return needs_push_properties_; }
 535   bool descendant_needs_push_properties() const {
 536     return num_dependents_need_push_properties_ > 0;
 537   }
 538
 539   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 540
 541   virtual void SetDebugInfo(
 542       scoped_refptr<base::debug::ConvertableToTraceFormat> other);
 543
 544   bool IsDrawnRenderSurfaceLayerListMember() const;
 545
 546   void Set3dSortingContextId(int id);
 547   int sorting_context_id() { return sorting_context_id_; }
 548
 549  protected:
 550   LayerImpl(LayerTreeImpl* layer_impl, int id);
 551
 552   // Get the color and size of the layer's debug border.
 553   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 554
 555   void AppendDebugBorderQuad(RenderPass* render_pass,
 556                              const gfx::Size& content_bounds,
 557                              const SharedQuadState* shared_quad_state,
 558                              AppendQuadsData* append_quads_data) const;
 559   void AppendDebugBorderQuad(RenderPass* render_pass,
 560                              const gfx::Size& content_bounds,
 561                              const SharedQuadState* shared_quad_state,
 562                              AppendQuadsData* append_quads_data,
 563                              SkColor color,
 564                              float width) const;
 565
 566   virtual void AsValueInto(base::DictionaryValue* dict) const;
 567
 568   void NoteLayerPropertyChanged();
 569   void NoteLayerPropertyChangedForSubtree();
 570
 571   // Note carefully this does not affect the current layer.
 572   void NoteLayerPropertyChangedForDescendants();
 573
 574  private:
 575   void NoteLayerPropertyChangedForDescendantsInternal();
 576
 577   virtual const char* LayerTypeAsString() const;
 578
 579   // Properties internal to LayerImpl
 580   LayerImpl* parent_;
 581   OwnedLayerImplList children_;
 582
 583   LayerImpl* scroll_parent_;
 584
 585   // Storing a pointer to a set rather than a set since this will be rarely
 586   // used. If this pointer turns out to be too heavy, we could have this (and
 587   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 588   // map somewhere.
 589   scoped_ptr<std::set<LayerImpl*> > scroll_children_;
 590
 591   LayerImpl* clip_parent_;
 592   scoped_ptr<std::set<LayerImpl*> > clip_children_;
 593
 594   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 595   // confirm newly assigned layer is still the previous one
 596   int mask_layer_id_;
 597   scoped_ptr<LayerImpl> mask_layer_;
 598   int replica_layer_id_;  // ditto
 599   scoped_ptr<LayerImpl> replica_layer_;
 600   int layer_id_;
 601   LayerTreeImpl* layer_tree_impl_;
 602
 603   // Properties synchronized from the associated Layer.
 604   gfx::Point3F transform_origin_;
 605   gfx::Size bounds_;
 606   gfx::SizeF temporary_impl_bounds_;
 607   gfx::Vector2d scroll_offset_;
 608   ScrollOffsetDelegate* scroll_offset_delegate_;
 609   LayerImpl* scroll_clip_layer_;
 610   bool scrollable_ : 1;
 611   bool should_scroll_on_main_thread_ : 1;
 612   bool have_wheel_event_handlers_ : 1;
 613   bool have_scroll_event_handlers_ : 1;
 614   bool user_scrollable_horizontal_ : 1;
 615   bool user_scrollable_vertical_ : 1;
 616   bool stacking_order_changed_ : 1;
 617   // Whether the "back" of this layer should draw.
 618   bool double_sided_ : 1;
 619   bool should_flatten_transform_ : 1;
 620
 621   // Tracks if drawing-related properties have changed since last redraw.
 622   bool layer_property_changed_ : 1;
 623
 624   bool masks_to_bounds_ : 1;
 625   bool contents_opaque_ : 1;
 626   bool is_root_for_isolated_group_ : 1;
 627   bool use_parent_backface_visibility_ : 1;
 628   bool draw_checkerboard_for_missing_tiles_ : 1;
 629   bool draws_content_ : 1;
 630   bool hide_layer_and_subtree_ : 1;
 631   bool force_render_surface_ : 1;
 632
 633   // Cache transform_'s invertibility.
 634   bool transform_is_invertible_ : 1;
 635
 636   // Set for the layer that other layers are fixed to.
 637   bool is_container_for_fixed_position_layers_ : 1;
 638   Region non_fast_scrollable_region_;
 639   Region touch_event_handler_region_;
 640   SkColor background_color_;
 641
 642   float opacity_;
 643   SkXfermode::Mode blend_mode_;
 644   gfx::PointF position_;
 645   gfx::Transform transform_;
 646
 647   LayerPositionConstraint position_constraint_;
 648
 649   gfx::Vector2dF scroll_delta_;
 650   gfx::Vector2d sent_scroll_delta_;
 651   gfx::Vector2dF last_scroll_offset_;
 652
 653   // The global depth value of the center of the layer. This value is used
 654   // to sort layers from back to front.
 655   float draw_depth_;
 656
 657   FilterOperations filters_;
 658   FilterOperations background_filters_;
 659
 660  protected:
 661   friend class TreeSynchronizer;
 662
 663   // This flag is set when the layer needs to push properties to the active
 664   // side.
 665   bool needs_push_properties_;
 666
 667   // The number of direct children or dependent layers that need to be recursed
 668   // to in order for them or a descendent of them to push properties to the
 669   // active side.
 670   int num_dependents_need_push_properties_;
 671
 672   // Layers that share a sorting context id will be sorted together in 3d
 673   // space.  0 is a special value that means this layer will not be sorted and
 674   // will be drawn in paint order.
 675   int sorting_context_id_;
 676
 677   DrawMode current_draw_mode_;
 678
 679  private:
 680   // Rect indicating what was repainted/updated during update.
 681   // Note that plugin layers bypass this and leave it empty.
 682   // Uses layer (not content) space.
 683   gfx::RectF update_rect_;
 684
 685   // This rect is in layer space.
 686   gfx::RectF damage_rect_;
 687
 688   // Manages animations for this layer.
 689   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 690
 691   // Manages scrollbars for this layer
 692   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 693
 694   scoped_ptr<ScrollbarSet> scrollbars_;
 695
 696   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 697
 698   // Group of properties that need to be computed based on the layer tree
 699   // hierarchy before layers can be drawn.
 700   DrawProperties<LayerImpl> draw_properties_;
 701
 702   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 703
 704   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 705 };
 706
 707 }  // namespace cc
 708
 709 #endif  // CC_LAYERS_LAYER_IMPL_H_