cc/layers/layer.h

   1 // Copyright 2010 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_H_
   6 #define CC_LAYERS_LAYER_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/callback.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/observer_list.h"
  14 #include "cc/animation/layer_animation_controller.h"
  15 #include "cc/animation/layer_animation_value_observer.h"
  16 #include "cc/animation/layer_animation_value_provider.h"
  17 #include "cc/base/cc_export.h"
  18 #include "cc/base/region.h"
  19 #include "cc/base/scoped_ptr_vector.h"
  20 #include "cc/debug/micro_benchmark.h"
  21 #include "cc/layers/draw_properties.h"
  22 #include "cc/layers/layer_lists.h"
  23 #include "cc/layers/layer_position_constraint.h"
  24 #include "cc/layers/paint_properties.h"
  25 #include "cc/layers/render_surface.h"
  26 #include "cc/output/filter_operations.h"
  27 #include "skia/ext/refptr.h"
  28 #include "third_party/skia/include/core/SkColor.h"
  29 #include "third_party/skia/include/core/SkImageFilter.h"
  30 #include "third_party/skia/include/core/SkPicture.h"
  31 #include "third_party/skia/include/core/SkXfermode.h"
  32 #include "ui/gfx/geometry/point3_f.h"
  33 #include "ui/gfx/geometry/rect.h"
  34 #include "ui/gfx/geometry/rect_f.h"
  35 #include "ui/gfx/geometry/scroll_offset.h"
  36 #include "ui/gfx/transform.h"
  37
  38 namespace gfx {
  39 class BoxF;
  40 }
  41
  42 namespace base {
  43 namespace debug {
  44 class ConvertableToTraceFormat;
  45 }
  46 }
  47
  48 namespace cc {
  49
  50 class Animation;
  51 class AnimationDelegate;
  52 struct AnimationEvent;
  53 class CopyOutputRequest;
  54 class LayerAnimationDelegate;
  55 class LayerAnimationEventObserver;
  56 class LayerClient;
  57 class LayerImpl;
  58 class LayerTreeHost;
  59 class LayerTreeImpl;
  60 class PriorityCalculator;
  61 class RenderingStatsInstrumentation;
  62 class ResourceUpdateQueue;
  63 class ScrollbarLayerInterface;
  64 class SimpleEnclosedRegion;
  65 struct AnimationEvent;
  66 template <typename LayerType>
  67 class OcclusionTracker;
  68
  69 // Base class for composited layers. Special layer types are derived from
  70 // this class.
  71 class CC_EXPORT Layer : public base::RefCounted<Layer>,
  72                         public LayerAnimationValueObserver,
  73                         public LayerAnimationValueProvider {
  74  public:
  75   typedef RenderSurfaceLayerList RenderSurfaceListType;
  76   typedef LayerList LayerListType;
  77   typedef RenderSurface RenderSurfaceType;
  78
  79   enum LayerIdLabels {
  80     INVALID_ID = -1,
  81   };
  82
  83   static scoped_refptr<Layer> Create();
  84
  85   int id() const { return layer_id_; }
  86
  87   Layer* RootLayer();
  88   Layer* parent() { return parent_; }
  89   const Layer* parent() const { return parent_; }
  90   void AddChild(scoped_refptr<Layer> child);
  91   void InsertChild(scoped_refptr<Layer> child, size_t index);
  92   void ReplaceChild(Layer* reference, scoped_refptr<Layer> new_layer);
  93   void RemoveFromParent();
  94   void RemoveAllChildren();
  95   void SetChildren(const LayerList& children);
  96   bool HasAncestor(const Layer* ancestor) const;
  97
  98   const LayerList& children() const { return children_; }
  99   Layer* child_at(size_t index) { return children_[index].get(); }
 100
 101   // This requests the layer and its subtree be rendered and given to the
 102   // callback. If the copy is unable to be produced (the layer is destroyed
 103   // first), then the callback is called with a nullptr/empty result.
 104   void RequestCopyOfOutput(scoped_ptr<CopyOutputRequest> request);
 105   bool HasCopyRequest() const {
 106     return !copy_requests_.empty();
 107   }
 108
 109   virtual void SetBackgroundColor(SkColor background_color);
 110   SkColor background_color() const { return background_color_; }
 111   // If contents_opaque(), return an opaque color else return a
 112   // non-opaque color.  Tries to return background_color(), if possible.
 113   SkColor SafeOpaqueBackgroundColor() const;
 114
 115   // A layer's bounds are in logical, non-page-scaled pixels (however, the
 116   // root layer's bounds are in physical pixels).
 117   void SetBounds(const gfx::Size& bounds);
 118   gfx::Size bounds() const { return bounds_; }
 119
 120   void SetMasksToBounds(bool masks_to_bounds);
 121   bool masks_to_bounds() const { return masks_to_bounds_; }
 122
 123   void SetMaskLayer(Layer* mask_layer);
 124   Layer* mask_layer() { return mask_layer_.get(); }
 125   const Layer* mask_layer() const { return mask_layer_.get(); }
 126
 127   virtual void SetNeedsDisplayRect(const gfx::Rect& dirty_rect);
 128   void SetNeedsDisplay() { SetNeedsDisplayRect(gfx::Rect(bounds())); }
 129
 130   void SetOpacity(float opacity);
 131   float opacity() const { return opacity_; }
 132   bool OpacityIsAnimating() const;
 133   virtual bool OpacityCanAnimateOnImplThread() const;
 134
 135   void SetBlendMode(SkXfermode::Mode blend_mode);
 136   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 137
 138   bool uses_default_blend_mode() const {
 139     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 140   }
 141
 142   // A layer is root for an isolated group when it and all its descendants are
 143   // drawn over a black and fully transparent background, creating an isolated
 144   // group. It should be used along with SetBlendMode(), in order to restrict
 145   // layers within the group to blend with layers outside this group.
 146   void SetIsRootForIsolatedGroup(bool root);
 147   bool is_root_for_isolated_group() const {
 148     return is_root_for_isolated_group_;
 149   }
 150
 151   void SetFilters(const FilterOperations& filters);
 152   const FilterOperations& filters() const { return filters_; }
 153   bool FilterIsAnimating() const;
 154
 155   // Background filters are filters applied to what is behind this layer, when
 156   // they are viewed through non-opaque regions in this layer. They are used
 157   // through the WebLayer interface, and are not exposed to HTML.
 158   void SetBackgroundFilters(const FilterOperations& filters);
 159   const FilterOperations& background_filters() const {
 160     return background_filters_;
 161   }
 162
 163   virtual void SetContentsOpaque(bool opaque);
 164   bool contents_opaque() const { return contents_opaque_; }
 165
 166   void SetPosition(const gfx::PointF& position);
 167   gfx::PointF position() const { return position_; }
 168
 169   void SetIsContainerForFixedPositionLayers(bool container);
 170   bool IsContainerForFixedPositionLayers() const;
 171
 172   void SetPositionConstraint(const LayerPositionConstraint& constraint);
 173   const LayerPositionConstraint& position_constraint() const {
 174     return position_constraint_;
 175   }
 176
 177   void SetTransform(const gfx::Transform& transform);
 178   const gfx::Transform& transform() const { return transform_; }
 179   bool TransformIsAnimating() const;
 180   bool transform_is_invertible() const { return transform_is_invertible_; }
 181
 182   void SetTransformOrigin(const gfx::Point3F&);
 183   gfx::Point3F transform_origin() { return transform_origin_; }
 184
 185   void SetScrollParent(Layer* parent);
 186
 187   Layer* scroll_parent() { return scroll_parent_; }
 188   const Layer* scroll_parent() const { return scroll_parent_; }
 189
 190   void AddScrollChild(Layer* child);
 191   void RemoveScrollChild(Layer* child);
 192
 193   std::set<Layer*>* scroll_children() { return scroll_children_.get(); }
 194   const std::set<Layer*>* scroll_children() const {
 195     return scroll_children_.get();
 196   }
 197
 198   void SetClipParent(Layer* ancestor);
 199
 200   Layer* clip_parent() { return clip_parent_; }
 201   const Layer* clip_parent() const {
 202     return clip_parent_;
 203   }
 204
 205   void AddClipChild(Layer* child);
 206   void RemoveClipChild(Layer* child);
 207
 208   std::set<Layer*>* clip_children() { return clip_children_.get(); }
 209   const std::set<Layer*>* clip_children() const {
 210     return clip_children_.get();
 211   }
 212
 213   DrawProperties<Layer>& draw_properties() { return draw_properties_; }
 214   const DrawProperties<Layer>& draw_properties() const {
 215     return draw_properties_;
 216   }
 217
 218   // The following are shortcut accessors to get various information from
 219   // draw_properties_
 220   const gfx::Transform& draw_transform() const {
 221     return draw_properties_.target_space_transform;
 222   }
 223   const gfx::Transform& screen_space_transform() const {
 224     return draw_properties_.screen_space_transform;
 225   }
 226   float draw_opacity() const { return draw_properties_.opacity; }
 227   bool draw_opacity_is_animating() const {
 228     return draw_properties_.opacity_is_animating;
 229   }
 230   bool draw_transform_is_animating() const {
 231     return draw_properties_.target_space_transform_is_animating;
 232   }
 233   bool screen_space_transform_is_animating() const {
 234     return draw_properties_.screen_space_transform_is_animating;
 235   }
 236   bool screen_space_opacity_is_animating() const {
 237     return draw_properties_.screen_space_opacity_is_animating;
 238   }
 239   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 240   bool is_clipped() const { return draw_properties_.is_clipped; }
 241   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 242   gfx::Rect drawable_content_rect() const {
 243     return draw_properties_.drawable_content_rect;
 244   }
 245   gfx::Rect visible_content_rect() const {
 246     return draw_properties_.visible_content_rect;
 247   }
 248   Layer* render_target() {
 249     DCHECK(!draw_properties_.render_target ||
 250            draw_properties_.render_target->render_surface());
 251     return draw_properties_.render_target;
 252   }
 253   const Layer* render_target() const {
 254     DCHECK(!draw_properties_.render_target ||
 255            draw_properties_.render_target->render_surface());
 256     return draw_properties_.render_target;
 257   }
 258   RenderSurface* render_surface() const {
 259     return draw_properties_.render_surface.get();
 260   }
 261   int num_unclipped_descendants() const {
 262     return draw_properties_.num_unclipped_descendants;
 263   }
 264
 265   void SetScrollOffset(const gfx::ScrollOffset& scroll_offset);
 266   gfx::ScrollOffset scroll_offset() const { return scroll_offset_; }
 267   void SetScrollOffsetFromImplSide(const gfx::ScrollOffset& scroll_offset);
 268
 269   void SetScrollClipLayerId(int clip_layer_id);
 270   bool scrollable() const { return scroll_clip_layer_id_ != INVALID_ID; }
 271
 272   void SetUserScrollable(bool horizontal, bool vertical);
 273   bool user_scrollable_horizontal() const {
 274     return user_scrollable_horizontal_;
 275   }
 276   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 277
 278   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread);
 279   bool should_scroll_on_main_thread() const {
 280     return should_scroll_on_main_thread_;
 281   }
 282
 283   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers);
 284   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 285
 286   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers);
 287   bool have_scroll_event_handlers() const {
 288     return have_scroll_event_handlers_;
 289   }
 290
 291   void SetNonFastScrollableRegion(const Region& non_fast_scrollable_region);
 292   const Region& non_fast_scrollable_region() const {
 293     return non_fast_scrollable_region_;
 294   }
 295
 296   void SetTouchEventHandlerRegion(const Region& touch_event_handler_region);
 297   const Region& touch_event_handler_region() const {
 298     return touch_event_handler_region_;
 299   }
 300
 301   void set_did_scroll_callback(const base::Closure& callback) {
 302     did_scroll_callback_ = callback;
 303   }
 304
 305   void SetDrawCheckerboardForMissingTiles(bool checkerboard);
 306   bool draw_checkerboard_for_missing_tiles() const {
 307     return draw_checkerboard_for_missing_tiles_;
 308   }
 309
 310   void SetForceRenderSurface(bool force_render_surface);
 311   bool force_render_surface() const { return force_render_surface_; }
 312
 313   gfx::Vector2dF ScrollDelta() const { return gfx::Vector2dF(); }
 314   gfx::ScrollOffset TotalScrollOffset() const {
 315     return ScrollOffsetWithDelta(scroll_offset(), ScrollDelta());
 316   }
 317
 318   void SetDoubleSided(bool double_sided);
 319   bool double_sided() const { return double_sided_; }
 320
 321   void SetShouldFlattenTransform(bool flatten);
 322   bool should_flatten_transform() const { return should_flatten_transform_; }
 323
 324   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 325
 326   void set_use_parent_backface_visibility(bool use) {
 327     use_parent_backface_visibility_ = use;
 328   }
 329   bool use_parent_backface_visibility() const {
 330     return use_parent_backface_visibility_;
 331   }
 332
 333   virtual void SetLayerTreeHost(LayerTreeHost* host);
 334
 335   virtual bool HasDelegatedContent() const;
 336   bool HasContributingDelegatedRenderPasses() const { return false; }
 337
 338   void SetIsDrawable(bool is_drawable);
 339
 340   void SetHideLayerAndSubtree(bool hide);
 341   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 342
 343   void SetReplicaLayer(Layer* layer);
 344   Layer* replica_layer() { return replica_layer_.get(); }
 345   const Layer* replica_layer() const { return replica_layer_.get(); }
 346
 347   bool has_mask() const { return !!mask_layer_.get(); }
 348   bool has_replica() const { return !!replica_layer_.get(); }
 349   bool replica_has_mask() const {
 350     return replica_layer_.get() &&
 351            (mask_layer_.get() || replica_layer_->mask_layer_.get());
 352   }
 353
 354   int NumDescendantsThatDrawContent() const;
 355
 356   // This is only virtual for tests.
 357   // TODO(awoloszyn): Remove this once we no longer need it for tests
 358   virtual bool DrawsContent() const;
 359
 360   // This methods typically need to be overwritten by derived classes.
 361   virtual void SavePaintProperties();
 362   // Returns true iff any resources were updated that need to be committed.
 363   virtual bool Update(ResourceUpdateQueue* queue,
 364                       const OcclusionTracker<Layer>* occlusion);
 365   virtual bool NeedMoreUpdates();
 366   virtual void SetIsMask(bool is_mask) {}
 367   virtual void ReduceMemoryUsage() {}
 368   virtual void OnOutputSurfaceCreated() {}
 369   virtual bool IsSuitableForGpuRasterization() const;
 370
 371   virtual scoped_refptr<base::debug::ConvertableToTraceFormat> TakeDebugInfo();
 372
 373   void SetLayerClient(LayerClient* client) { client_ = client; }
 374
 375   virtual void PushPropertiesTo(LayerImpl* layer);
 376
 377   void CreateRenderSurface();
 378   void ClearRenderSurface();
 379   void ClearRenderSurfaceLayerList();
 380
 381   // The contents scale converts from logical, non-page-scaled pixels to target
 382   // pixels. The contents scale is 1 for the root layer as it is already in
 383   // physical pixels. By default contents scale is forced to be 1 except for
 384   // subclasses of ContentsScalingLayer.
 385   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 386   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 387   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 388
 389   virtual void CalculateContentsScale(float ideal_contents_scale,
 390                                       float* contents_scale_x,
 391                                       float* contents_scale_y,
 392                                       gfx::Size* content_bounds);
 393
 394   LayerTreeHost* layer_tree_host() { return layer_tree_host_; }
 395   const LayerTreeHost* layer_tree_host() const { return layer_tree_host_; }
 396
 397   // Set the priority of all desired textures in this layer.
 398   virtual void SetTexturePriorities(const PriorityCalculator& priority_calc) {}
 399
 400   bool AddAnimation(scoped_ptr<Animation> animation);
 401   void PauseAnimation(int animation_id, double time_offset);
 402   void RemoveAnimation(int animation_id);
 403
 404   LayerAnimationController* layer_animation_controller() {
 405     return layer_animation_controller_.get();
 406   }
 407   void SetLayerAnimationControllerForTest(
 408       scoped_refptr<LayerAnimationController> controller);
 409
 410   void set_layer_animation_delegate(AnimationDelegate* delegate) {
 411     layer_animation_controller_->set_layer_animation_delegate(delegate);
 412   }
 413
 414   bool HasActiveAnimation() const;
 415
 416   void AddLayerAnimationEventObserver(
 417       LayerAnimationEventObserver* animation_observer);
 418   void RemoveLayerAnimationEventObserver(
 419       LayerAnimationEventObserver* animation_observer);
 420
 421   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
 422
 423   virtual ScrollbarLayerInterface* ToScrollbarLayer();
 424
 425   gfx::Rect LayerRectToContentRect(const gfx::Rect& layer_rect) const;
 426
 427   virtual skia::RefPtr<SkPicture> GetPicture() const;
 428
 429   // Constructs a LayerImpl of the correct runtime type for this Layer type.
 430   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 431
 432   bool NeedsDisplayForTesting() const { return !update_rect_.IsEmpty(); }
 433   void ResetNeedsDisplayForTesting() { update_rect_ = gfx::Rect(); }
 434
 435   RenderingStatsInstrumentation* rendering_stats_instrumentation() const;
 436
 437   const PaintProperties& paint_properties() const {
 438     return paint_properties_;
 439   }
 440
 441   // The scale at which contents should be rastered, to match the scale at
 442   // which they will drawn to the screen. This scale is a component of the
 443   // contents scale but does not include page/device scale factors.
 444   // TODO(danakj): This goes away when TiledLayer goes away.
 445   void set_raster_scale(float scale) { raster_scale_ = scale; }
 446   float raster_scale() const { return raster_scale_; }
 447   bool raster_scale_is_unknown() const { return raster_scale_ == 0.f; }
 448
 449   virtual bool SupportsLCDText() const;
 450
 451   void SetNeedsPushProperties();
 452   bool needs_push_properties() const { return needs_push_properties_; }
 453   bool descendant_needs_push_properties() const {
 454     return num_dependents_need_push_properties_ > 0;
 455   }
 456   void reset_needs_push_properties_for_testing() {
 457     needs_push_properties_ = false;
 458   }
 459
 460   virtual void RunMicroBenchmark(MicroBenchmark* benchmark);
 461
 462   void Set3dSortingContextId(int id);
 463   int sorting_context_id() const { return sorting_context_id_; }
 464
 465  protected:
 466   friend class LayerImpl;
 467   friend class TreeSynchronizer;
 468   ~Layer() override;
 469
 470   Layer();
 471
 472   // These SetNeeds functions are in order of severity of update:
 473   //
 474   // Called when this layer has been modified in some way, but isn't sure
 475   // that it needs a commit yet.  It needs CalcDrawProperties and UpdateLayers
 476   // before it knows whether or not a commit is required.
 477   void SetNeedsUpdate();
 478   // Called when a property has been modified in a way that the layer
 479   // knows immediately that a commit is required.  This implies SetNeedsUpdate
 480   // as well as SetNeedsPushProperties to push that property.
 481   void SetNeedsCommit();
 482   // Called when there's been a change in layer structure.  Implies both
 483   // SetNeedsUpdate and SetNeedsCommit, but not SetNeedsPushProperties.
 484   void SetNeedsFullTreeSync();
 485
 486   // Called when the next commit should wait until the pending tree is activated
 487   // before finishing the commit and unblocking the main thread. Used to ensure
 488   // unused resources on the impl thread are returned before commit completes.
 489   void SetNextCommitWaitsForActivation();
 490
 491   // Will recalculate whether the layer draws content and set draws_content_
 492   // appropriately.
 493   void UpdateDrawsContent(bool has_drawable_content);
 494   virtual bool HasDrawableContent() const;
 495
 496   // Called when the layer's number of drawable descendants changes.
 497   void AddDrawableDescendants(int num);
 498
 499   void AddDependentNeedsPushProperties();
 500   void RemoveDependentNeedsPushProperties();
 501   bool parent_should_know_need_push_properties() const {
 502     return needs_push_properties() || descendant_needs_push_properties();
 503   }
 504
 505   bool IsPropertyChangeAllowed() const;
 506
 507   void reset_raster_scale_to_unknown() { raster_scale_ = 0.f; }
 508
 509   // This flag is set when the layer needs to push properties to the impl
 510   // side.
 511   bool needs_push_properties_;
 512
 513   // The number of direct children or dependent layers that need to be recursed
 514   // to in order for them or a descendent of them to push properties to the impl
 515   // side.
 516   int num_dependents_need_push_properties_;
 517
 518   // Tracks whether this layer may have changed stacking order with its
 519   // siblings.
 520   bool stacking_order_changed_;
 521
 522   // The update rect is the region of the compositor resource that was
 523   // actually updated by the compositor. For layers that may do updating
 524   // outside the compositor's control (i.e. plugin layers), this information
 525   // is not available and the update rect will remain empty.
 526   // Note this rect is in layer space (not content space).
 527   gfx::Rect update_rect_;
 528
 529   scoped_refptr<Layer> mask_layer_;
 530
 531   int layer_id_;
 532
 533   // When true, the layer is about to perform an update. Any commit requests
 534   // will be handled implicitly after the update completes.
 535   bool ignore_set_needs_commit_;
 536
 537   // Layers that share a sorting context id will be sorted together in 3d
 538   // space.  0 is a special value that means this layer will not be sorted and
 539   // will be drawn in paint order.
 540   int sorting_context_id_;
 541
 542  private:
 543   friend class base::RefCounted<Layer>;
 544
 545   void SetParent(Layer* layer);
 546   bool DescendantIsFixedToContainerLayer() const;
 547
 548   // Returns the index of the child or -1 if not found.
 549   int IndexOfChild(const Layer* reference);
 550
 551   // This should only be called from RemoveFromParent().
 552   void RemoveChildOrDependent(Layer* child);
 553
 554   // LayerAnimationValueProvider implementation.
 555   gfx::ScrollOffset ScrollOffsetForAnimation() const override;
 556
 557   // LayerAnimationValueObserver implementation.
 558   void OnFilterAnimated(const FilterOperations& filters) override;
 559   void OnOpacityAnimated(float opacity) override;
 560   void OnTransformAnimated(const gfx::Transform& transform) override;
 561   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
 562   void OnAnimationWaitingForDeletion() override;
 563   bool IsActive() const override;
 564
 565   // If this layer has a scroll parent, it removes |this| from its list of
 566   // scroll children.
 567   void RemoveFromScrollTree();
 568
 569   // If this layer has a clip parent, it removes |this| from its list of clip
 570   // children.
 571   void RemoveFromClipTree();
 572
 573   LayerList children_;
 574   Layer* parent_;
 575
 576   // Layer instances have a weak pointer to their LayerTreeHost.
 577   // This pointer value is nil when a Layer is not in a tree and is
 578   // updated via SetLayerTreeHost() if a layer moves between trees.
 579   LayerTreeHost* layer_tree_host_;
 580
 581   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 582
 583   // Layer properties.
 584   gfx::Size bounds_;
 585
 586   gfx::ScrollOffset scroll_offset_;
 587   // This variable indicates which ancestor layer (if any) whose size,
 588   // transformed relative to this layer, defines the maximum scroll offset for
 589   // this layer.
 590   int scroll_clip_layer_id_;
 591   int num_descendants_that_draw_content_;
 592   bool should_scroll_on_main_thread_ : 1;
 593   bool have_wheel_event_handlers_ : 1;
 594   bool have_scroll_event_handlers_ : 1;
 595   bool user_scrollable_horizontal_ : 1;
 596   bool user_scrollable_vertical_ : 1;
 597   bool is_root_for_isolated_group_ : 1;
 598   bool is_container_for_fixed_position_layers_ : 1;
 599   bool is_drawable_ : 1;
 600   bool draws_content_ : 1;
 601   bool hide_layer_and_subtree_ : 1;
 602   bool masks_to_bounds_ : 1;
 603   bool contents_opaque_ : 1;
 604   bool double_sided_ : 1;
 605   bool should_flatten_transform_ : 1;
 606   bool use_parent_backface_visibility_ : 1;
 607   bool draw_checkerboard_for_missing_tiles_ : 1;
 608   bool force_render_surface_ : 1;
 609   bool transform_is_invertible_ : 1;
 610   Region non_fast_scrollable_region_;
 611   Region touch_event_handler_region_;
 612   gfx::PointF position_;
 613   SkColor background_color_;
 614   float opacity_;
 615   SkXfermode::Mode blend_mode_;
 616   FilterOperations filters_;
 617   FilterOperations background_filters_;
 618   LayerPositionConstraint position_constraint_;
 619   Layer* scroll_parent_;
 620   scoped_ptr<std::set<Layer*>> scroll_children_;
 621
 622   Layer* clip_parent_;
 623   scoped_ptr<std::set<Layer*>> clip_children_;
 624
 625   gfx::Transform transform_;
 626   gfx::Point3F transform_origin_;
 627
 628   // Replica layer used for reflections.
 629   scoped_refptr<Layer> replica_layer_;
 630
 631   // Transient properties.
 632   float raster_scale_;
 633
 634   LayerClient* client_;
 635
 636   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 637
 638   base::Closure did_scroll_callback_;
 639
 640   DrawProperties<Layer> draw_properties_;
 641
 642   PaintProperties paint_properties_;
 643
 644   DISALLOW_COPY_AND_ASSIGN(Layer);
 645 };
 646
 647 }  // namespace cc
 648
 649 #endif  // CC_LAYERS_LAYER_H_