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 "cc/trees/occlusion_tracker.h"
  28 #include "skia/ext/refptr.h"
  29 #include "third_party/skia/include/core/SkColor.h"
  30 #include "third_party/skia/include/core/SkImageFilter.h"
  31 #include "third_party/skia/include/core/SkPicture.h"
  32 #include "third_party/skia/include/core/SkXfermode.h"
  33 #include "ui/gfx/rect.h"
  34 #include "ui/gfx/rect_f.h"
  35 #include "ui/gfx/transform.h"
  36
  37 namespace gfx {
  38 class BoxF;
  39 }
  40
  41 namespace base {
  42 namespace debug {
  43 class ConvertableToTraceFormat;
  44 }
  45 }
  46
  47 namespace cc {
  48
  49 class Animation;
  50 class AnimationDelegate;
  51 struct AnimationEvent;
  52 class CopyOutputRequest;
  53 class LayerAnimationDelegate;
  54 class LayerAnimationEventObserver;
  55 class LayerClient;
  56 class LayerImpl;
  57 class LayerTreeHost;
  58 class LayerTreeImpl;
  59 class PriorityCalculator;
  60 class RenderingStatsInstrumentation;
  61 class ResourceUpdateQueue;
  62 class ScrollbarLayerInterface;
  63 struct AnimationEvent;
  64
  65 // Base class for composited layers. Special layer types are derived from
  66 // this class.
  67 class CC_EXPORT Layer : public base::RefCounted<Layer>,
  68                         public LayerAnimationValueObserver,
  69                         public LayerAnimationValueProvider {
  70  public:
  71   typedef RenderSurfaceLayerList RenderSurfaceListType;
  72   typedef LayerList LayerListType;
  73   typedef RenderSurface RenderSurfaceType;
  74
  75   enum LayerIdLabels {
  76     INVALID_ID = -1,
  77   };
  78
  79   static scoped_refptr<Layer> Create();
  80
  81   int id() const { return layer_id_; }
  82
  83   Layer* RootLayer();
  84   Layer* parent() { return parent_; }
  85   const Layer* parent() const { return parent_; }
  86   void AddChild(scoped_refptr<Layer> child);
  87   void InsertChild(scoped_refptr<Layer> child, size_t index);
  88   void ReplaceChild(Layer* reference, scoped_refptr<Layer> new_layer);
  89   void RemoveFromParent();
  90   void RemoveAllChildren();
  91   void SetChildren(const LayerList& children);
  92   bool HasAncestor(const Layer* ancestor) const;
  93
  94   const LayerList& children() const { return children_; }
  95   Layer* child_at(size_t index) { return children_[index].get(); }
  96
  97   // This requests the layer and its subtree be rendered and given to the
  98   // callback. If the copy is unable to be produced (the layer is destroyed
  99   // first), then the callback is called with a NULL/empty result.
 100   void RequestCopyOfOutput(scoped_ptr<CopyOutputRequest> request);
 101   bool HasCopyRequest() const {
 102     return !copy_requests_.empty();
 103   }
 104
 105   void SetAnchorPoint(const gfx::PointF& anchor_point);
 106   gfx::PointF anchor_point() const { return anchor_point_; }
 107
 108   void SetAnchorPointZ(float anchor_point_z);
 109   float anchor_point_z() const { return anchor_point_z_; }
 110
 111   virtual void SetBackgroundColor(SkColor background_color);
 112   SkColor background_color() const { return background_color_; }
 113   // If contents_opaque(), return an opaque color else return a
 114   // non-opaque color.  Tries to return background_color(), if possible.
 115   SkColor SafeOpaqueBackgroundColor() const;
 116
 117   // A layer's bounds are in logical, non-page-scaled pixels (however, the
 118   // root layer's bounds are in physical pixels).
 119   void SetBounds(const gfx::Size& bounds);
 120   gfx::Size bounds() const { return bounds_; }
 121
 122   void SetMasksToBounds(bool masks_to_bounds);
 123   bool masks_to_bounds() const { return masks_to_bounds_; }
 124
 125   void SetMaskLayer(Layer* mask_layer);
 126   Layer* mask_layer() { return mask_layer_.get(); }
 127   const Layer* mask_layer() const { return mask_layer_.get(); }
 128
 129   virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect);
 130   void SetNeedsDisplay() { SetNeedsDisplayRect(gfx::RectF(bounds())); }
 131
 132   void SetOpacity(float opacity);
 133   float opacity() const { return opacity_; }
 134   bool OpacityIsAnimating() const;
 135   virtual bool OpacityCanAnimateOnImplThread() const;
 136
 137   void SetBlendMode(SkXfermode::Mode blend_mode);
 138   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 139
 140   bool uses_default_blend_mode() const {
 141     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 142   }
 143
 144   // A layer is root for an isolated group when it and all its descendants are
 145   // drawn over a black and fully transparent background, creating an isolated
 146   // group. It should be used along with SetBlendMode(), in order to restrict
 147   // layers within the group to blend with layers outside this group.
 148   void SetIsRootForIsolatedGroup(bool root);
 149   bool is_root_for_isolated_group() const {
 150     return is_root_for_isolated_group_;
 151   }
 152
 153   void SetFilters(const FilterOperations& filters);
 154   const FilterOperations& filters() const { return filters_; }
 155   bool FilterIsAnimating() const;
 156
 157   // Background filters are filters applied to what is behind this layer, when
 158   // they are viewed through non-opaque regions in this layer. They are used
 159   // through the WebLayer interface, and are not exposed to HTML.
 160   void SetBackgroundFilters(const FilterOperations& filters);
 161   const FilterOperations& background_filters() const {
 162     return background_filters_;
 163   }
 164
 165   virtual void SetContentsOpaque(bool opaque);
 166   bool contents_opaque() const { return contents_opaque_; }
 167
 168   void SetPosition(const gfx::PointF& position);
 169   gfx::PointF position() const { return position_; }
 170
 171   void SetIsContainerForFixedPositionLayers(bool container);
 172   bool IsContainerForFixedPositionLayers() const;
 173
 174   void SetPositionConstraint(const LayerPositionConstraint& constraint);
 175   const LayerPositionConstraint& position_constraint() const {
 176     return position_constraint_;
 177   }
 178
 179   void SetTransform(const gfx::Transform& transform);
 180   const gfx::Transform& transform() const { return transform_; }
 181   bool TransformIsAnimating() const;
 182
 183   void SetScrollParent(Layer* parent);
 184
 185   Layer* scroll_parent() { return scroll_parent_; }
 186   const Layer* scroll_parent() const { return scroll_parent_; }
 187
 188   void AddScrollChild(Layer* child);
 189   void RemoveScrollChild(Layer* child);
 190
 191   std::set<Layer*>* scroll_children() { return scroll_children_.get(); }
 192   const std::set<Layer*>* scroll_children() const {
 193     return scroll_children_.get();
 194   }
 195
 196   void SetClipParent(Layer* ancestor);
 197
 198   Layer* clip_parent() { return clip_parent_; }
 199   const Layer* clip_parent() const {
 200     return clip_parent_;
 201   }
 202
 203   void AddClipChild(Layer* child);
 204   void RemoveClipChild(Layer* child);
 205
 206   std::set<Layer*>* clip_children() { return clip_children_.get(); }
 207   const std::set<Layer*>* clip_children() const {
 208     return clip_children_.get();
 209   }
 210
 211   DrawProperties<Layer>& draw_properties() { return draw_properties_; }
 212   const DrawProperties<Layer>& draw_properties() const {
 213     return draw_properties_;
 214   }
 215
 216   // The following are shortcut accessors to get various information from
 217   // draw_properties_
 218   const gfx::Transform& draw_transform() const {
 219     return draw_properties_.target_space_transform;
 220   }
 221   const gfx::Transform& screen_space_transform() const {
 222     return draw_properties_.screen_space_transform;
 223   }
 224   float draw_opacity() const { return draw_properties_.opacity; }
 225   bool draw_opacity_is_animating() const {
 226     return draw_properties_.opacity_is_animating;
 227   }
 228   bool draw_transform_is_animating() const {
 229     return draw_properties_.target_space_transform_is_animating;
 230   }
 231   bool screen_space_transform_is_animating() const {
 232     return draw_properties_.screen_space_transform_is_animating;
 233   }
 234   bool screen_space_opacity_is_animating() const {
 235     return draw_properties_.screen_space_opacity_is_animating;
 236   }
 237   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 238   bool is_clipped() const { return draw_properties_.is_clipped; }
 239   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 240   gfx::Rect drawable_content_rect() const {
 241     return draw_properties_.drawable_content_rect;
 242   }
 243   gfx::Rect visible_content_rect() const {
 244     return draw_properties_.visible_content_rect;
 245   }
 246   Layer* render_target() {
 247     DCHECK(!draw_properties_.render_target ||
 248            draw_properties_.render_target->render_surface());
 249     return draw_properties_.render_target;
 250   }
 251   const Layer* render_target() const {
 252     DCHECK(!draw_properties_.render_target ||
 253            draw_properties_.render_target->render_surface());
 254     return draw_properties_.render_target;
 255   }
 256   RenderSurface* render_surface() const {
 257     return draw_properties_.render_surface.get();
 258   }
 259   int num_unclipped_descendants() const {
 260     return draw_properties_.num_unclipped_descendants;
 261   }
 262
 263   void SetScrollOffset(gfx::Vector2d scroll_offset);
 264   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
 265   void SetScrollOffsetFromImplSide(const gfx::Vector2d& scroll_offset);
 266
 267   gfx::Vector2d MaxScrollOffset() const;
 268   void SetScrollClipLayerId(int clip_layer_id);
 269   bool scrollable() const { return scroll_clip_layer_id_ != INVALID_ID; }
 270
 271   void SetUserScrollable(bool horizontal, bool vertical);
 272   bool user_scrollable_horizontal() const {
 273     return user_scrollable_horizontal_;
 274   }
 275   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 276
 277   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread);
 278   bool should_scroll_on_main_thread() const {
 279     return should_scroll_on_main_thread_;
 280   }
 281
 282   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers);
 283   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 284
 285   void SetNonFastScrollableRegion(const Region& non_fast_scrollable_region);
 286   const Region& non_fast_scrollable_region() const {
 287     return non_fast_scrollable_region_;
 288   }
 289
 290   void SetTouchEventHandlerRegion(const Region& touch_event_handler_region);
 291   const Region& touch_event_handler_region() const {
 292     return touch_event_handler_region_;
 293   }
 294
 295   void set_did_scroll_callback(const base::Closure& callback) {
 296     did_scroll_callback_ = callback;
 297   }
 298
 299   void SetDrawCheckerboardForMissingTiles(bool checkerboard);
 300   bool DrawCheckerboardForMissingTiles() const {
 301     return draw_checkerboard_for_missing_tiles_;
 302   }
 303
 304   void SetForceRenderSurface(bool force_render_surface);
 305   bool force_render_surface() const { return force_render_surface_; }
 306
 307   gfx::Vector2d ScrollDelta() const { return gfx::Vector2d(); }
 308   gfx::Vector2dF TotalScrollOffset() const {
 309     // Floating point to match the LayerImpl version.
 310     return scroll_offset() + ScrollDelta();
 311   }
 312
 313   void SetDoubleSided(bool double_sided);
 314   bool double_sided() const { return double_sided_; }
 315
 316   void SetShouldFlattenTransform(bool flatten);
 317   bool should_flatten_transform() const { return should_flatten_transform_; }
 318
 319   void SetIs3dSorted(bool sorted);
 320   bool is_3d_sorted() const { return is_3d_sorted_; }
 321
 322   void set_use_parent_backface_visibility(bool use) {
 323     use_parent_backface_visibility_ = use;
 324   }
 325   bool use_parent_backface_visibility() const {
 326     return use_parent_backface_visibility_;
 327   }
 328
 329   virtual void SetLayerTreeHost(LayerTreeHost* host);
 330
 331   bool HasDelegatedContent() const { return false; }
 332   bool HasContributingDelegatedRenderPasses() const { return false; }
 333
 334   void SetIsDrawable(bool is_drawable);
 335
 336   void SetHideLayerAndSubtree(bool hide);
 337   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 338
 339   void SetReplicaLayer(Layer* layer);
 340   Layer* replica_layer() { return replica_layer_.get(); }
 341   const Layer* replica_layer() const { return replica_layer_.get(); }
 342
 343   bool has_mask() const { return !!mask_layer_.get(); }
 344   bool has_replica() const { return !!replica_layer_.get(); }
 345   bool replica_has_mask() const {
 346     return replica_layer_.get() &&
 347            (mask_layer_.get() || replica_layer_->mask_layer_.get());
 348   }
 349
 350   // These methods typically need to be overwritten by derived classes.
 351   virtual bool DrawsContent() const;
 352   virtual void SavePaintProperties();
 353   // Returns true iff any resources were updated that need to be committed.
 354   virtual bool Update(ResourceUpdateQueue* queue,
 355                       const OcclusionTracker* occlusion);
 356   virtual bool NeedMoreUpdates();
 357   virtual void SetIsMask(bool is_mask) {}
 358   virtual void ReduceMemoryUsage() {}
 359   virtual void OnOutputSurfaceCreated() {}
 360
 361   virtual scoped_refptr<base::debug::ConvertableToTraceFormat> TakeDebugInfo();
 362
 363   void SetLayerClient(LayerClient* client) { client_ = client; }
 364
 365   virtual void PushPropertiesTo(LayerImpl* layer);
 366
 367   void CreateRenderSurface();
 368   void ClearRenderSurface();
 369
 370   // The contents scale converts from logical, non-page-scaled pixels to target
 371   // pixels. The contents scale is 1 for the root layer as it is already in
 372   // physical pixels. By default contents scale is forced to be 1 except for
 373   // subclasses of ContentsScalingLayer.
 374   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 375   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 376   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 377
 378   virtual void CalculateContentsScale(float ideal_contents_scale,
 379                                       float device_scale_factor,
 380                                       float page_scale_factor,
 381                                       bool animating_transform_to_screen,
 382                                       float* contents_scale_x,
 383                                       float* contents_scale_y,
 384                                       gfx::Size* content_bounds);
 385
 386   LayerTreeHost* layer_tree_host() { return layer_tree_host_; }
 387   const LayerTreeHost* layer_tree_host() const { return layer_tree_host_; }
 388
 389   // Set the priority of all desired textures in this layer.
 390   virtual void SetTexturePriorities(const PriorityCalculator& priority_calc) {}
 391
 392   bool AddAnimation(scoped_ptr<Animation> animation);
 393   void PauseAnimation(int animation_id, double time_offset);
 394   void RemoveAnimation(int animation_id);
 395
 396   LayerAnimationController* layer_animation_controller() {
 397     return layer_animation_controller_.get();
 398   }
 399   void SetLayerAnimationControllerForTest(
 400       scoped_refptr<LayerAnimationController> controller);
 401
 402   void set_layer_animation_delegate(AnimationDelegate* delegate) {
 403     layer_animation_controller_->set_layer_animation_delegate(delegate);
 404   }
 405
 406   bool HasActiveAnimation() const;
 407
 408   void AddLayerAnimationEventObserver(
 409       LayerAnimationEventObserver* animation_observer);
 410   void RemoveLayerAnimationEventObserver(
 411       LayerAnimationEventObserver* animation_observer);
 412
 413   virtual Region VisibleContentOpaqueRegion() const;
 414
 415   virtual ScrollbarLayerInterface* ToScrollbarLayer();
 416
 417   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 418
 419   virtual skia::RefPtr<SkPicture> GetPicture() const;
 420
 421   // Constructs a LayerImpl of the correct runtime type for this Layer type.
 422   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 423
 424   bool NeedsDisplayForTesting() const { return !update_rect_.IsEmpty(); }
 425   void ResetNeedsDisplayForTesting() { update_rect_ = gfx::RectF(); }
 426
 427   RenderingStatsInstrumentation* rendering_stats_instrumentation() const;
 428
 429   const PaintProperties& paint_properties() const {
 430     return paint_properties_;
 431   }
 432
 433   // The scale at which contents should be rastered, to match the scale at
 434   // which they will drawn to the screen. This scale is a component of the
 435   // contents scale but does not include page/device scale factors.
 436   // TODO(danakj): This goes away when TiledLayer goes away.
 437   void set_raster_scale(float scale) { raster_scale_ = scale; }
 438   float raster_scale() const { return raster_scale_; }
 439   bool raster_scale_is_unknown() const { return raster_scale_ == 0.f; }
 440
 441   virtual bool SupportsLCDText() const;
 442
 443   bool needs_push_properties() const { return needs_push_properties_; }
 444   bool descendant_needs_push_properties() const {
 445     return num_dependents_need_push_properties_ > 0;
 446   }
 447
 448   virtual void RunMicroBenchmark(MicroBenchmark* benchmark);
 449
 450  protected:
 451   friend class LayerImpl;
 452   friend class TreeSynchronizer;
 453   virtual ~Layer();
 454
 455   Layer();
 456
 457   // These SetNeeds functions are in order of severity of update:
 458   //
 459   // Called when this layer has been modified in some way, but isn't sure
 460   // that it needs a commit yet.  It needs CalcDrawProperties and UpdateLayers
 461   // before it knows whether or not a commit is required.
 462   void SetNeedsUpdate();
 463   // Called when a property has been modified in a way that the layer
 464   // knows immediately that a commit is required.  This implies SetNeedsUpdate
 465   // as well as SetNeedsPushProperties to push that property.
 466   void SetNeedsCommit();
 467   // Called when there's been a change in layer structure.  Implies both
 468   // SetNeedsUpdate and SetNeedsCommit, but not SetNeedsPushProperties.
 469   void SetNeedsFullTreeSync();
 470
 471   // Called when the next commit should wait until the pending tree is activated
 472   // before finishing the commit and unblocking the main thread. Used to ensure
 473   // unused resources on the impl thread are returned before commit completes.
 474   void SetNextCommitWaitsForActivation();
 475
 476   // Called when the blend mode or filters have been changed.
 477   void SetNeedsFilterContextIfNeeded();
 478
 479   void SetNeedsPushProperties();
 480   void AddDependentNeedsPushProperties();
 481   void RemoveDependentNeedsPushProperties();
 482   bool parent_should_know_need_push_properties() const {
 483     return needs_push_properties() || descendant_needs_push_properties();
 484   }
 485
 486   bool IsPropertyChangeAllowed() const;
 487
 488   // If this layer has a scroll parent, it removes |this| from its list of
 489   // scroll children.
 490   void RemoveFromScrollTree();
 491
 492   // If this layer has a clip parent, it removes |this| from its list of clip
 493   // children.
 494   void RemoveFromClipTree();
 495
 496   void reset_raster_scale_to_unknown() { raster_scale_ = 0.f; }
 497
 498   // This flag is set when the layer needs to push properties to the impl
 499   // side.
 500   bool needs_push_properties_;
 501
 502   // The number of direct children or dependent layers that need to be recursed
 503   // to in order for them or a descendent of them to push properties to the impl
 504   // side.
 505   int num_dependents_need_push_properties_;
 506
 507   // Tracks whether this layer may have changed stacking order with its
 508   // siblings.
 509   bool stacking_order_changed_;
 510
 511   // The update rect is the region of the compositor resource that was
 512   // actually updated by the compositor. For layers that may do updating
 513   // outside the compositor's control (i.e. plugin layers), this information
 514   // is not available and the update rect will remain empty.
 515   // Note this rect is in layer space (not content space).
 516   gfx::RectF update_rect_;
 517
 518   scoped_refptr<Layer> mask_layer_;
 519
 520   int layer_id_;
 521
 522   // When true, the layer is about to perform an update. Any commit requests
 523   // will be handled implicitly after the update completes.
 524   bool ignore_set_needs_commit_;
 525
 526  private:
 527   friend class base::RefCounted<Layer>;
 528
 529   void SetParent(Layer* layer);
 530   bool DescendantIsFixedToContainerLayer() const;
 531
 532   // Returns the index of the child or -1 if not found.
 533   int IndexOfChild(const Layer* reference);
 534
 535   // This should only be called from RemoveFromParent().
 536   void RemoveChildOrDependent(Layer* child);
 537
 538   // LayerAnimationValueProvider implementation.
 539   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
 540
 541   // LayerAnimationValueObserver implementation.
 542   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
 543   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
 544   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
 545   virtual void OnScrollOffsetAnimated(
 546       const gfx::Vector2dF& scroll_offset) OVERRIDE;
 547   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
 548   virtual bool IsActive() const OVERRIDE;
 549
 550   LayerList children_;
 551   Layer* parent_;
 552
 553   // Layer instances have a weak pointer to their LayerTreeHost.
 554   // This pointer value is nil when a Layer is not in a tree and is
 555   // updated via SetLayerTreeHost() if a layer moves between trees.
 556   LayerTreeHost* layer_tree_host_;
 557
 558   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 559
 560   // Layer properties.
 561   gfx::Size bounds_;
 562
 563   gfx::Vector2d scroll_offset_;
 564   // This variable indicates which ancestor layer (if any) whose size,
 565   // transformed relative to this layer, defines the maximum scroll offset for
 566   // this layer.
 567   int scroll_clip_layer_id_;
 568   bool scrollable_ : 1;
 569   bool should_scroll_on_main_thread_ : 1;
 570   bool have_wheel_event_handlers_ : 1;
 571   bool user_scrollable_horizontal_ : 1;
 572   bool user_scrollable_vertical_ : 1;
 573   bool is_root_for_isolated_group_ : 1;
 574   bool is_container_for_fixed_position_layers_ : 1;
 575   bool is_drawable_ : 1;
 576   bool hide_layer_and_subtree_ : 1;
 577   bool masks_to_bounds_ : 1;
 578   bool contents_opaque_ : 1;
 579   bool double_sided_ : 1;
 580   bool should_flatten_transform_ : 1;
 581   bool use_parent_backface_visibility_ : 1;
 582   bool draw_checkerboard_for_missing_tiles_ : 1;
 583   bool force_render_surface_ : 1;
 584   bool is_3d_sorted_ : 1;
 585   Region non_fast_scrollable_region_;
 586   Region touch_event_handler_region_;
 587   gfx::PointF position_;
 588   gfx::PointF anchor_point_;
 589   SkColor background_color_;
 590   float opacity_;
 591   SkXfermode::Mode blend_mode_;
 592   FilterOperations filters_;
 593   FilterOperations background_filters_;
 594   float anchor_point_z_;
 595   LayerPositionConstraint position_constraint_;
 596   Layer* scroll_parent_;
 597   scoped_ptr<std::set<Layer*> > scroll_children_;
 598
 599   Layer* clip_parent_;
 600   scoped_ptr<std::set<Layer*> > clip_children_;
 601
 602   gfx::Transform transform_;
 603
 604   // Replica layer used for reflections.
 605   scoped_refptr<Layer> replica_layer_;
 606
 607   // Transient properties.
 608   float raster_scale_;
 609
 610   LayerClient* client_;
 611
 612   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 613
 614   base::Closure did_scroll_callback_;
 615
 616   DrawProperties<Layer> draw_properties_;
 617
 618   PaintProperties paint_properties_;
 619
 620   DISALLOW_COPY_AND_ASSIGN(Layer);
 621 };
 622
 623 }  // namespace cc
 624
 625 #endif  // CC_LAYERS_LAYER_H_