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/point3_f.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 template <typename LayerType>
  65 class OcclusionTracker;
  66
  67 // Base class for composited layers. Special layer types are derived from
  68 // this class.
  69 class CC_EXPORT Layer : public base::RefCounted<Layer>,
  70                         public LayerAnimationValueObserver,
  71                         public LayerAnimationValueProvider {
  72  public:
  73   typedef RenderSurfaceLayerList RenderSurfaceListType;
  74   typedef LayerList LayerListType;
  75   typedef RenderSurface RenderSurfaceType;
  76
  77   enum LayerIdLabels {
  78     INVALID_ID = -1,
  79   };
  80
  81   static scoped_refptr<Layer> Create();
  82
  83   int id() const { return layer_id_; }
  84
  85   Layer* RootLayer();
  86   Layer* parent() { return parent_; }
  87   const Layer* parent() const { return parent_; }
  88   void AddChild(scoped_refptr<Layer> child);
  89   void InsertChild(scoped_refptr<Layer> child, size_t index);
  90   void ReplaceChild(Layer* reference, scoped_refptr<Layer> new_layer);
  91   void RemoveFromParent();
  92   void RemoveAllChildren();
  93   void SetChildren(const LayerList& children);
  94   bool HasAncestor(const Layer* ancestor) const;
  95
  96   const LayerList& children() const { return children_; }
  97   Layer* child_at(size_t index) { return children_[index].get(); }
  98
  99   // This requests the layer and its subtree be rendered and given to the
 100   // callback. If the copy is unable to be produced (the layer is destroyed
 101   // first), then the callback is called with a NULL/empty result.
 102   void RequestCopyOfOutput(scoped_ptr<CopyOutputRequest> request);
 103   bool HasCopyRequest() const {
 104     return !copy_requests_.empty();
 105   }
 106
 107   virtual void SetBackgroundColor(SkColor background_color);
 108   SkColor background_color() const { return background_color_; }
 109   // If contents_opaque(), return an opaque color else return a
 110   // non-opaque color.  Tries to return background_color(), if possible.
 111   SkColor SafeOpaqueBackgroundColor() const;
 112
 113   // A layer's bounds are in logical, non-page-scaled pixels (however, the
 114   // root layer's bounds are in physical pixels).
 115   void SetBounds(const gfx::Size& bounds);
 116   gfx::Size bounds() const { return bounds_; }
 117
 118   void SetMasksToBounds(bool masks_to_bounds);
 119   bool masks_to_bounds() const { return masks_to_bounds_; }
 120
 121   void SetMaskLayer(Layer* mask_layer);
 122   Layer* mask_layer() { return mask_layer_.get(); }
 123   const Layer* mask_layer() const { return mask_layer_.get(); }
 124
 125   virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect);
 126   void SetNeedsDisplay() { SetNeedsDisplayRect(gfx::RectF(bounds())); }
 127
 128   void SetOpacity(float opacity);
 129   float opacity() const { return opacity_; }
 130   bool OpacityIsAnimating() const;
 131   virtual bool OpacityCanAnimateOnImplThread() const;
 132
 133   void SetBlendMode(SkXfermode::Mode blend_mode);
 134   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 135
 136   bool uses_default_blend_mode() const {
 137     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 138   }
 139
 140   // A layer is root for an isolated group when it and all its descendants are
 141   // drawn over a black and fully transparent background, creating an isolated
 142   // group. It should be used along with SetBlendMode(), in order to restrict
 143   // layers within the group to blend with layers outside this group.
 144   void SetIsRootForIsolatedGroup(bool root);
 145   bool is_root_for_isolated_group() const {
 146     return is_root_for_isolated_group_;
 147   }
 148
 149   void SetFilters(const FilterOperations& filters);
 150   const FilterOperations& filters() const { return filters_; }
 151   bool FilterIsAnimating() const;
 152
 153   // Background filters are filters applied to what is behind this layer, when
 154   // they are viewed through non-opaque regions in this layer. They are used
 155   // through the WebLayer interface, and are not exposed to HTML.
 156   void SetBackgroundFilters(const FilterOperations& filters);
 157   const FilterOperations& background_filters() const {
 158     return background_filters_;
 159   }
 160
 161   virtual void SetContentsOpaque(bool opaque);
 162   bool contents_opaque() const { return contents_opaque_; }
 163
 164   void SetPosition(const gfx::PointF& position);
 165   gfx::PointF position() const { return position_; }
 166
 167   void SetIsContainerForFixedPositionLayers(bool container);
 168   bool IsContainerForFixedPositionLayers() const;
 169
 170   void SetPositionConstraint(const LayerPositionConstraint& constraint);
 171   const LayerPositionConstraint& position_constraint() const {
 172     return position_constraint_;
 173   }
 174
 175   void SetTransform(const gfx::Transform& transform);
 176   const gfx::Transform& transform() const { return transform_; }
 177   bool TransformIsAnimating() const;
 178   bool transform_is_invertible() const { return transform_is_invertible_; }
 179
 180   void SetTransformOrigin(const gfx::Point3F&);
 181   gfx::Point3F transform_origin() { return transform_origin_; }
 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   void SetScrollClipLayerId(int clip_layer_id);
 268   bool scrollable() const { return scroll_clip_layer_id_ != INVALID_ID; }
 269
 270   void SetUserScrollable(bool horizontal, bool vertical);
 271   bool user_scrollable_horizontal() const {
 272     return user_scrollable_horizontal_;
 273   }
 274   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 275
 276   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread);
 277   bool should_scroll_on_main_thread() const {
 278     return should_scroll_on_main_thread_;
 279   }
 280
 281   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers);
 282   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 283
 284   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers);
 285   bool have_scroll_event_handlers() const {
 286     return have_scroll_event_handlers_;
 287   }
 288
 289   void SetNonFastScrollableRegion(const Region& non_fast_scrollable_region);
 290   const Region& non_fast_scrollable_region() const {
 291     return non_fast_scrollable_region_;
 292   }
 293
 294   void SetTouchEventHandlerRegion(const Region& touch_event_handler_region);
 295   const Region& touch_event_handler_region() const {
 296     return touch_event_handler_region_;
 297   }
 298
 299   void set_did_scroll_callback(const base::Closure& callback) {
 300     did_scroll_callback_ = callback;
 301   }
 302
 303   void SetDrawCheckerboardForMissingTiles(bool checkerboard);
 304   bool draw_checkerboard_for_missing_tiles() const {
 305     return draw_checkerboard_for_missing_tiles_;
 306   }
 307
 308   void SetForceRenderSurface(bool force_render_surface);
 309   bool force_render_surface() const { return force_render_surface_; }
 310
 311   gfx::Vector2d ScrollDelta() const { return gfx::Vector2d(); }
 312   gfx::Vector2dF TotalScrollOffset() const {
 313     // Floating point to match the LayerImpl version.
 314     return scroll_offset() + ScrollDelta();
 315   }
 316
 317   void SetDoubleSided(bool double_sided);
 318   bool double_sided() const { return double_sided_; }
 319
 320   void SetShouldFlattenTransform(bool flatten);
 321   bool should_flatten_transform() const { return should_flatten_transform_; }
 322
 323   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 324
 325   void set_use_parent_backface_visibility(bool use) {
 326     use_parent_backface_visibility_ = use;
 327   }
 328   bool use_parent_backface_visibility() const {
 329     return use_parent_backface_visibility_;
 330   }
 331
 332   virtual void SetLayerTreeHost(LayerTreeHost* host);
 333
 334   bool HasDelegatedContent() const { return false; }
 335   bool HasContributingDelegatedRenderPasses() const { return false; }
 336
 337   void SetIsDrawable(bool is_drawable);
 338
 339   void SetHideLayerAndSubtree(bool hide);
 340   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 341
 342   void SetReplicaLayer(Layer* layer);
 343   Layer* replica_layer() { return replica_layer_.get(); }
 344   const Layer* replica_layer() const { return replica_layer_.get(); }
 345
 346   bool has_mask() const { return !!mask_layer_.get(); }
 347   bool has_replica() const { return !!replica_layer_.get(); }
 348   bool replica_has_mask() const {
 349     return replica_layer_.get() &&
 350            (mask_layer_.get() || replica_layer_->mask_layer_.get());
 351   }
 352
 353   // These methods typically need to be overwritten by derived classes.
 354   virtual bool DrawsContent() const;
 355   virtual void SavePaintProperties();
 356   // Returns true iff any resources were updated that need to be committed.
 357   virtual bool Update(ResourceUpdateQueue* queue,
 358                       const OcclusionTracker<Layer>* occlusion);
 359   virtual bool NeedMoreUpdates();
 360   virtual void SetIsMask(bool is_mask) {}
 361   virtual void ReduceMemoryUsage() {}
 362   virtual void OnOutputSurfaceCreated() {}
 363   virtual bool IsSuitableForGpuRasterization() const;
 364
 365   virtual scoped_refptr<base::debug::ConvertableToTraceFormat> TakeDebugInfo();
 366
 367   void SetLayerClient(LayerClient* client) { client_ = client; }
 368
 369   virtual void PushPropertiesTo(LayerImpl* layer);
 370
 371   void CreateRenderSurface();
 372   void ClearRenderSurface();
 373   void ClearRenderSurfaceLayerList();
 374
 375   // The contents scale converts from logical, non-page-scaled pixels to target
 376   // pixels. The contents scale is 1 for the root layer as it is already in
 377   // physical pixels. By default contents scale is forced to be 1 except for
 378   // subclasses of ContentsScalingLayer.
 379   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 380   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 381   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 382
 383   virtual void CalculateContentsScale(float ideal_contents_scale,
 384                                       float device_scale_factor,
 385                                       float page_scale_factor,
 386                                       float maximum_animation_contents_scale,
 387                                       bool animating_transform_to_screen,
 388                                       float* contents_scale_x,
 389                                       float* contents_scale_y,
 390                                       gfx::Size* content_bounds);
 391
 392   LayerTreeHost* layer_tree_host() { return layer_tree_host_; }
 393   const LayerTreeHost* layer_tree_host() const { return layer_tree_host_; }
 394
 395   // Set the priority of all desired textures in this layer.
 396   virtual void SetTexturePriorities(const PriorityCalculator& priority_calc) {}
 397
 398   bool AddAnimation(scoped_ptr<Animation> animation);
 399   void PauseAnimation(int animation_id, double time_offset);
 400   void RemoveAnimation(int animation_id);
 401
 402   LayerAnimationController* layer_animation_controller() {
 403     return layer_animation_controller_.get();
 404   }
 405   void SetLayerAnimationControllerForTest(
 406       scoped_refptr<LayerAnimationController> controller);
 407
 408   void set_layer_animation_delegate(AnimationDelegate* delegate) {
 409     layer_animation_controller_->set_layer_animation_delegate(delegate);
 410   }
 411
 412   bool HasActiveAnimation() const;
 413
 414   void AddLayerAnimationEventObserver(
 415       LayerAnimationEventObserver* animation_observer);
 416   void RemoveLayerAnimationEventObserver(
 417       LayerAnimationEventObserver* animation_observer);
 418
 419   virtual Region VisibleContentOpaqueRegion() const;
 420
 421   virtual ScrollbarLayerInterface* ToScrollbarLayer();
 422
 423   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 424
 425   virtual skia::RefPtr<SkPicture> GetPicture() const;
 426
 427   // Constructs a LayerImpl of the correct runtime type for this Layer type.
 428   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 429
 430   bool NeedsDisplayForTesting() const { return !update_rect_.IsEmpty(); }
 431   void ResetNeedsDisplayForTesting() { update_rect_ = gfx::RectF(); }
 432
 433   RenderingStatsInstrumentation* rendering_stats_instrumentation() const;
 434
 435   const PaintProperties& paint_properties() const {
 436     return paint_properties_;
 437   }
 438
 439   // The scale at which contents should be rastered, to match the scale at
 440   // which they will drawn to the screen. This scale is a component of the
 441   // contents scale but does not include page/device scale factors.
 442   // TODO(danakj): This goes away when TiledLayer goes away.
 443   void set_raster_scale(float scale) { raster_scale_ = scale; }
 444   float raster_scale() const { return raster_scale_; }
 445   bool raster_scale_is_unknown() const { return raster_scale_ == 0.f; }
 446
 447   virtual bool SupportsLCDText() const;
 448
 449   void SetNeedsPushProperties();
 450   bool needs_push_properties() const { return needs_push_properties_; }
 451   bool descendant_needs_push_properties() const {
 452     return num_dependents_need_push_properties_ > 0;
 453   }
 454   void reset_needs_push_properties_for_testing() {
 455     needs_push_properties_ = false;
 456   }
 457
 458   virtual void RunMicroBenchmark(MicroBenchmark* benchmark);
 459
 460   void Set3dSortingContextId(int id);
 461   int sorting_context_id() const { return sorting_context_id_; }
 462
 463  protected:
 464   friend class LayerImpl;
 465   friend class TreeSynchronizer;
 466   virtual ~Layer();
 467
 468   Layer();
 469
 470   // These SetNeeds functions are in order of severity of update:
 471   //
 472   // Called when this layer has been modified in some way, but isn't sure
 473   // that it needs a commit yet.  It needs CalcDrawProperties and UpdateLayers
 474   // before it knows whether or not a commit is required.
 475   void SetNeedsUpdate();
 476   // Called when a property has been modified in a way that the layer
 477   // knows immediately that a commit is required.  This implies SetNeedsUpdate
 478   // as well as SetNeedsPushProperties to push that property.
 479   void SetNeedsCommit();
 480   // Called when there's been a change in layer structure.  Implies both
 481   // SetNeedsUpdate and SetNeedsCommit, but not SetNeedsPushProperties.
 482   void SetNeedsFullTreeSync();
 483
 484   // Called when the next commit should wait until the pending tree is activated
 485   // before finishing the commit and unblocking the main thread. Used to ensure
 486   // unused resources on the impl thread are returned before commit completes.
 487   void SetNextCommitWaitsForActivation();
 488
 489   void AddDependentNeedsPushProperties();
 490   void RemoveDependentNeedsPushProperties();
 491   bool parent_should_know_need_push_properties() const {
 492     return needs_push_properties() || descendant_needs_push_properties();
 493   }
 494
 495   bool IsPropertyChangeAllowed() const;
 496
 497   // If this layer has a scroll parent, it removes |this| from its list of
 498   // scroll children.
 499   void RemoveFromScrollTree();
 500
 501   // If this layer has a clip parent, it removes |this| from its list of clip
 502   // children.
 503   void RemoveFromClipTree();
 504
 505   void reset_raster_scale_to_unknown() { raster_scale_ = 0.f; }
 506
 507   // This flag is set when the layer needs to push properties to the impl
 508   // side.
 509   bool needs_push_properties_;
 510
 511   // The number of direct children or dependent layers that need to be recursed
 512   // to in order for them or a descendent of them to push properties to the impl
 513   // side.
 514   int num_dependents_need_push_properties_;
 515
 516   // Tracks whether this layer may have changed stacking order with its
 517   // siblings.
 518   bool stacking_order_changed_;
 519
 520   // The update rect is the region of the compositor resource that was
 521   // actually updated by the compositor. For layers that may do updating
 522   // outside the compositor's control (i.e. plugin layers), this information
 523   // is not available and the update rect will remain empty.
 524   // Note this rect is in layer space (not content space).
 525   gfx::RectF update_rect_;
 526
 527   scoped_refptr<Layer> mask_layer_;
 528
 529   int layer_id_;
 530
 531   // When true, the layer is about to perform an update. Any commit requests
 532   // will be handled implicitly after the update completes.
 533   bool ignore_set_needs_commit_;
 534
 535   // Layers that share a sorting context id will be sorted together in 3d
 536   // space.  0 is a special value that means this layer will not be sorted and
 537   // will be drawn in paint order.
 538   int sorting_context_id_;
 539
 540  private:
 541   friend class base::RefCounted<Layer>;
 542
 543   void SetParent(Layer* layer);
 544   bool DescendantIsFixedToContainerLayer() const;
 545
 546   // Returns the index of the child or -1 if not found.
 547   int IndexOfChild(const Layer* reference);
 548
 549   // This should only be called from RemoveFromParent().
 550   void RemoveChildOrDependent(Layer* child);
 551
 552   // LayerAnimationValueProvider implementation.
 553   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
 554
 555   // LayerAnimationValueObserver implementation.
 556   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
 557   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
 558   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
 559   virtual void OnScrollOffsetAnimated(
 560       const gfx::Vector2dF& scroll_offset) OVERRIDE;
 561   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
 562   virtual bool IsActive() const OVERRIDE;
 563
 564   LayerList children_;
 565   Layer* parent_;
 566
 567   // Layer instances have a weak pointer to their LayerTreeHost.
 568   // This pointer value is nil when a Layer is not in a tree and is
 569   // updated via SetLayerTreeHost() if a layer moves between trees.
 570   LayerTreeHost* layer_tree_host_;
 571
 572   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 573
 574   // Layer properties.
 575   gfx::Size bounds_;
 576
 577   gfx::Vector2d scroll_offset_;
 578   // This variable indicates which ancestor layer (if any) whose size,
 579   // transformed relative to this layer, defines the maximum scroll offset for
 580   // this layer.
 581   int scroll_clip_layer_id_;
 582   bool should_scroll_on_main_thread_ : 1;
 583   bool have_wheel_event_handlers_ : 1;
 584   bool have_scroll_event_handlers_ : 1;
 585   bool user_scrollable_horizontal_ : 1;
 586   bool user_scrollable_vertical_ : 1;
 587   bool is_root_for_isolated_group_ : 1;
 588   bool is_container_for_fixed_position_layers_ : 1;
 589   bool is_drawable_ : 1;
 590   bool hide_layer_and_subtree_ : 1;
 591   bool masks_to_bounds_ : 1;
 592   bool contents_opaque_ : 1;
 593   bool double_sided_ : 1;
 594   bool should_flatten_transform_ : 1;
 595   bool use_parent_backface_visibility_ : 1;
 596   bool draw_checkerboard_for_missing_tiles_ : 1;
 597   bool force_render_surface_ : 1;
 598   bool transform_is_invertible_ : 1;
 599   Region non_fast_scrollable_region_;
 600   Region touch_event_handler_region_;
 601   gfx::PointF position_;
 602   SkColor background_color_;
 603   float opacity_;
 604   SkXfermode::Mode blend_mode_;
 605   FilterOperations filters_;
 606   FilterOperations background_filters_;
 607   LayerPositionConstraint position_constraint_;
 608   Layer* scroll_parent_;
 609   scoped_ptr<std::set<Layer*> > scroll_children_;
 610
 611   Layer* clip_parent_;
 612   scoped_ptr<std::set<Layer*> > clip_children_;
 613
 614   gfx::Transform transform_;
 615   gfx::Point3F transform_origin_;
 616
 617   // Replica layer used for reflections.
 618   scoped_refptr<Layer> replica_layer_;
 619
 620   // Transient properties.
 621   float raster_scale_;
 622
 623   LayerClient* client_;
 624
 625   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 626
 627   base::Closure did_scroll_callback_;
 628
 629   DrawProperties<Layer> draw_properties_;
 630
 631   PaintProperties paint_properties_;
 632
 633   DISALLOW_COPY_AND_ASSIGN(Layer);
 634 };
 635
 636 }  // namespace cc
 637
 638 #endif  // CC_LAYERS_LAYER_H_