src/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/layer_animation_controller.h"
  15 #include "cc/animation/layer_animation_value_observer.h"
  16 #include "cc/base/cc_export.h"
  17 #include "cc/base/region.h"
  18 #include "cc/base/scoped_ptr_vector.h"
  19 #include "cc/input/input_handler.h"
  20 #include "cc/layers/compositing_reasons.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/render_surface_impl.h"
  25 #include "cc/output/filter_operations.h"
  26 #include "cc/quads/render_pass.h"
  27 #include "cc/quads/shared_quad_state.h"
  28 #include "cc/resources/resource_provider.h"
  29 #include "skia/ext/refptr.h"
  30 #include "third_party/skia/include/core/SkColor.h"
  31 #include "third_party/skia/include/core/SkImageFilter.h"
  32 #include "third_party/skia/include/core/SkPicture.h"
  33 #include "ui/gfx/rect.h"
  34 #include "ui/gfx/rect_f.h"
  35 #include "ui/gfx/transform.h"
  36
  37 namespace base {
  38 class DictionaryValue;
  39 }
  40
  41 namespace cc {
  42
  43 class LayerTreeHostImpl;
  44 class LayerTreeImpl;
  45 class QuadSink;
  46 class Renderer;
  47 class ScrollbarAnimationController;
  48 class ScrollbarLayerImplBase;
  49 class Layer;
  50
  51 struct AppendQuadsData;
  52
  53 enum DrawMode {
  54   DRAW_MODE_NONE,
  55   DRAW_MODE_HARDWARE,
  56   DRAW_MODE_SOFTWARE,
  57   DRAW_MODE_RESOURCELESS_SOFTWARE
  58 };
  59
  60 class CC_EXPORT LayerImpl : LayerAnimationValueObserver {
  61  public:
  62   typedef LayerImplList RenderSurfaceListType;
  63   typedef LayerImplList LayerListType;
  64   typedef RenderSurfaceImpl RenderSurfaceType;
  65
  66   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
  67     return make_scoped_ptr(new LayerImpl(tree_impl, id));
  68   }
  69
  70   virtual ~LayerImpl();
  71
  72   int id() const { return layer_id_; }
  73
  74   // LayerAnimationValueObserver implementation.
  75   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
  76   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
  77   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
  78   virtual bool IsActive() const OVERRIDE;
  79
  80   // Tree structure.
  81   LayerImpl* parent() { return parent_; }
  82   const LayerImpl* parent() const { return parent_; }
  83   const OwnedLayerImplList& children() const { return children_; }
  84   OwnedLayerImplList& children() { return children_; }
  85   LayerImpl* child_at(size_t index) const { return children_[index]; }
  86   void AddChild(scoped_ptr<LayerImpl> child);
  87   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
  88   void set_parent(LayerImpl* parent) { parent_ = parent; }
  89   // Warning: This does not preserve tree structure invariants.
  90   void ClearChildList();
  91
  92   bool HasAncestor(const LayerImpl* ancestor) const;
  93
  94   void SetScrollParent(LayerImpl* parent);
  95
  96   LayerImpl* scroll_parent() { return scroll_parent_; }
  97   const LayerImpl* scroll_parent() const { return scroll_parent_; }
  98
  99   void SetScrollChildren(std::set<LayerImpl*>* children);
 100   void RemoveScrollChild(LayerImpl* child);
 101
 102   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 103   const std::set<LayerImpl*>* scroll_children() const {
 104     return scroll_children_.get();
 105   }
 106
 107   void SetClipParent(LayerImpl* ancestor);
 108
 109   LayerImpl* clip_parent() {
 110     return clip_parent_;
 111   }
 112   const LayerImpl* clip_parent() const {
 113     return clip_parent_;
 114   }
 115
 116   void SetClipChildren(std::set<LayerImpl*>* children);
 117   void RemoveClipChild(LayerImpl* child);
 118
 119   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 120   const std::set<LayerImpl*>* clip_children() const {
 121     return clip_children_.get();
 122   }
 123
 124   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 125   void TakeCopyRequestsAndTransformToTarget(
 126       ScopedPtrVector<CopyOutputRequest>* request);
 127   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 128
 129   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 130   LayerImpl* mask_layer() { return mask_layer_.get(); }
 131   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 132   scoped_ptr<LayerImpl> TakeMaskLayer();
 133
 134   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 135   LayerImpl* replica_layer() { return replica_layer_.get(); }
 136   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 137   scoped_ptr<LayerImpl> TakeReplicaLayer();
 138
 139   bool has_mask() const { return mask_layer_; }
 140   bool has_replica() const { return replica_layer_; }
 141   bool replica_has_mask() const {
 142     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 143   }
 144
 145   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 146
 147   scoped_ptr<SharedQuadState> CreateSharedQuadState() const;
 148   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 149   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 150   // DidDraw is guaranteed to be called before another WillDraw or before
 151   // the layer is destroyed. To enforce this, any class that overrides
 152   // WillDraw/DidDraw must call the base class version only if WillDraw
 153   // returns true.
 154   virtual bool WillDraw(DrawMode draw_mode,
 155                         ResourceProvider* resource_provider);
 156   virtual void AppendQuads(QuadSink* quad_sink,
 157                            AppendQuadsData* append_quads_data) {}
 158   virtual void DidDraw(ResourceProvider* resource_provider);
 159
 160   virtual ResourceProvider::ResourceId ContentsResourceId() const;
 161
 162   virtual bool HasDelegatedContent() const;
 163   virtual bool HasContributingDelegatedRenderPasses() const;
 164   virtual RenderPass::Id FirstContributingRenderPassId() const;
 165   virtual RenderPass::Id NextContributingRenderPassId(RenderPass::Id id) const;
 166
 167   virtual void UpdateTilePriorities() {}
 168
 169   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 170
 171   // Returns true if this layer has content to draw.
 172   void SetDrawsContent(bool draws_content);
 173   bool DrawsContent() const { return draws_content_; }
 174
 175   void SetHideLayerAndSubtree(bool hide);
 176   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 177
 178   bool force_render_surface() const { return force_render_surface_; }
 179   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 180
 181   void SetAnchorPoint(gfx::PointF anchor_point);
 182   gfx::PointF anchor_point() const { return anchor_point_; }
 183
 184   void SetAnchorPointZ(float anchor_point_z);
 185   float anchor_point_z() const { return anchor_point_z_; }
 186
 187   void SetBackgroundColor(SkColor background_color);
 188   SkColor background_color() const { return background_color_; }
 189   // If contents_opaque(), return an opaque color else return a
 190   // non-opaque color.  Tries to return background_color(), if possible.
 191   SkColor SafeOpaqueBackgroundColor() const;
 192
 193   void SetFilters(const FilterOperations& filters);
 194   const FilterOperations& filters() const { return filters_; }
 195   bool FilterIsAnimating() const;
 196   bool FilterIsAnimatingOnImplOnly() const;
 197
 198   void SetBackgroundFilters(const FilterOperations& filters);
 199   const FilterOperations& background_filters() const {
 200     return background_filters_;
 201   }
 202
 203   void SetMasksToBounds(bool masks_to_bounds);
 204   bool masks_to_bounds() const { return masks_to_bounds_; }
 205
 206   void SetContentsOpaque(bool opaque);
 207   bool contents_opaque() const { return contents_opaque_; }
 208
 209   void SetOpacity(float opacity);
 210   float opacity() const { return opacity_; }
 211   bool OpacityIsAnimating() const;
 212   bool OpacityIsAnimatingOnImplOnly() const;
 213
 214   void SetPosition(gfx::PointF position);
 215   gfx::PointF position() const { return position_; }
 216
 217   void SetIsContainerForFixedPositionLayers(bool container) {
 218     is_container_for_fixed_position_layers_ = container;
 219   }
 220   // This is a non-trivial function in Layer.
 221   bool IsContainerForFixedPositionLayers() const {
 222     return is_container_for_fixed_position_layers_;
 223   }
 224
 225   void SetFixedContainerSizeDelta(gfx::Vector2dF delta) {
 226     fixed_container_size_delta_ = delta;
 227   }
 228   gfx::Vector2dF fixed_container_size_delta() const {
 229     return fixed_container_size_delta_;
 230   }
 231
 232   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 233     position_constraint_ = constraint;
 234   }
 235   const LayerPositionConstraint& position_constraint() const {
 236     return position_constraint_;
 237   }
 238
 239   void SetPreserves3d(bool preserves_3d);
 240   bool preserves_3d() const { return preserves_3d_; }
 241
 242   void SetUseParentBackfaceVisibility(bool use) {
 243     use_parent_backface_visibility_ = use;
 244   }
 245   bool use_parent_backface_visibility() const {
 246     return use_parent_backface_visibility_;
 247   }
 248
 249   void SetSublayerTransform(const gfx::Transform& sublayer_transform);
 250   const gfx::Transform& sublayer_transform() const {
 251     return sublayer_transform_;
 252   }
 253
 254   // Debug layer name.
 255   void SetDebugName(const std::string& debug_name) { debug_name_ = debug_name; }
 256   std::string debug_name() const { return debug_name_; }
 257
 258   void SetCompositingReasons(CompositingReasons reasons) {
 259       compositing_reasons_ = reasons;
 260   }
 261
 262   CompositingReasons compositing_reasons() const {
 263       return compositing_reasons_;
 264   }
 265
 266   bool ShowDebugBorders() const;
 267
 268   // These invalidate the host's render surface layer list.  The caller
 269   // is responsible for calling set_needs_update_draw_properties on the tree
 270   // so that its list can be recreated.
 271   void CreateRenderSurface();
 272   void ClearRenderSurface();
 273
 274   DrawProperties<LayerImpl>& draw_properties() {
 275     return draw_properties_;
 276   }
 277   const DrawProperties<LayerImpl>& draw_properties() const {
 278     return draw_properties_;
 279   }
 280
 281   // The following are shortcut accessors to get various information from
 282   // draw_properties_
 283   const gfx::Transform& draw_transform() const {
 284     return draw_properties_.target_space_transform;
 285   }
 286   const gfx::Transform& screen_space_transform() const {
 287     return draw_properties_.screen_space_transform;
 288   }
 289   float draw_opacity() const { return draw_properties_.opacity; }
 290   bool draw_opacity_is_animating() const {
 291     return draw_properties_.opacity_is_animating;
 292   }
 293   bool draw_transform_is_animating() const {
 294     return draw_properties_.target_space_transform_is_animating;
 295   }
 296   bool screen_space_transform_is_animating() const {
 297     return draw_properties_.screen_space_transform_is_animating;
 298   }
 299   bool screen_space_opacity_is_animating() const {
 300     return draw_properties_.screen_space_opacity_is_animating;
 301   }
 302   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 303   bool is_clipped() const { return draw_properties_.is_clipped; }
 304   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 305   gfx::Rect drawable_content_rect() const {
 306     return draw_properties_.drawable_content_rect;
 307   }
 308   gfx::Rect visible_content_rect() const {
 309     return draw_properties_.visible_content_rect;
 310   }
 311   LayerImpl* render_target() {
 312     DCHECK(!draw_properties_.render_target ||
 313            draw_properties_.render_target->render_surface());
 314     return draw_properties_.render_target;
 315   }
 316   const LayerImpl* render_target() const {
 317     DCHECK(!draw_properties_.render_target ||
 318            draw_properties_.render_target->render_surface());
 319     return draw_properties_.render_target;
 320   }
 321   RenderSurfaceImpl* render_surface() const {
 322     return draw_properties_.render_surface.get();
 323   }
 324   int num_unclipped_descendants() const {
 325     return draw_properties_.num_unclipped_descendants;
 326   }
 327
 328   // The client should be responsible for setting bounds, content bounds and
 329   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 330   // them from the other values.
 331
 332   void SetBounds(gfx::Size bounds);
 333   gfx::Size bounds() const { return bounds_; }
 334
 335   void SetContentBounds(gfx::Size content_bounds);
 336   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 337
 338   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 339   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 340   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 341
 342   virtual void CalculateContentsScale(float ideal_contents_scale,
 343                                       float device_scale_factor,
 344                                       float page_scale_factor,
 345                                       bool animating_transform_to_screen,
 346                                       float* contents_scale_x,
 347                                       float* contents_scale_y,
 348                                       gfx::Size* content_bounds);
 349
 350   void SetScrollOffsetDelegate(
 351       LayerScrollOffsetDelegate* scroll_offset_delegate);
 352   bool IsExternalFlingActive() const;
 353
 354   void SetScrollOffset(gfx::Vector2d scroll_offset);
 355   void SetScrollOffsetAndDelta(gfx::Vector2d scroll_offset,
 356                                gfx::Vector2dF scroll_delta);
 357   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
 358
 359   void SetMaxScrollOffset(gfx::Vector2d max_scroll_offset);
 360   gfx::Vector2d max_scroll_offset() const { return max_scroll_offset_; }
 361
 362   void SetScrollDelta(gfx::Vector2dF scroll_delta);
 363   gfx::Vector2dF ScrollDelta() const;
 364
 365   gfx::Vector2dF TotalScrollOffset() const;
 366
 367   void SetSentScrollDelta(gfx::Vector2d sent_scroll_delta);
 368   gfx::Vector2d sent_scroll_delta() const { return sent_scroll_delta_; }
 369
 370   // Returns the delta of the scroll that was outside of the bounds of the
 371   // initial scroll
 372   gfx::Vector2dF ScrollBy(gfx::Vector2dF scroll);
 373
 374   void SetScrollable(bool scrollable) { scrollable_ = scrollable; }
 375   bool scrollable() const { return scrollable_; }
 376
 377   void set_user_scrollable_horizontal(bool scrollable) {
 378     user_scrollable_horizontal_ = scrollable;
 379   }
 380   void set_user_scrollable_vertical(bool scrollable) {
 381     user_scrollable_vertical_ = scrollable;
 382   }
 383
 384   void ApplySentScrollDeltasFromAbortedCommit();
 385   void ApplyScrollDeltasSinceBeginMainFrame();
 386
 387   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 388     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 389   }
 390   bool should_scroll_on_main_thread() const {
 391     return should_scroll_on_main_thread_;
 392   }
 393
 394   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 395     have_wheel_event_handlers_ = have_wheel_event_handlers;
 396   }
 397   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 398
 399   void SetNonFastScrollableRegion(const Region& region) {
 400     non_fast_scrollable_region_ = region;
 401   }
 402   const Region& non_fast_scrollable_region() const {
 403     return non_fast_scrollable_region_;
 404   }
 405
 406   void SetTouchEventHandlerRegion(const Region& region) {
 407     touch_event_handler_region_ = region;
 408   }
 409   const Region& touch_event_handler_region() const {
 410     return touch_event_handler_region_;
 411   }
 412
 413   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 414     draw_checkerboard_for_missing_tiles_ = checkerboard;
 415   }
 416   bool DrawCheckerboardForMissingTiles() const;
 417
 418   InputHandler::ScrollStatus TryScroll(
 419       gfx::PointF screen_space_point,
 420       InputHandler::ScrollInputType type) const;
 421
 422   void SetDoubleSided(bool double_sided);
 423   bool double_sided() const { return double_sided_; }
 424
 425   void SetTransform(const gfx::Transform& transform);
 426   const gfx::Transform& transform() const { return transform_; }
 427   bool TransformIsAnimating() const;
 428   bool TransformIsAnimatingOnImplOnly() const;
 429
 430   // Note this rect is in layer space (not content space).
 431   void set_update_rect(const gfx::RectF& update_rect) {
 432     update_rect_ = update_rect;
 433   }
 434   const gfx::RectF& update_rect() const { return update_rect_; }
 435
 436   virtual base::DictionaryValue* LayerTreeAsJson() const;
 437
 438   void SetStackingOrderChanged(bool stacking_order_changed);
 439
 440   bool LayerPropertyChanged() const {
 441     return layer_property_changed_ || LayerIsAlwaysDamaged();
 442   }
 443
 444   void ResetAllChangeTrackingForSubtree();
 445
 446   virtual bool LayerIsAlwaysDamaged() const;
 447
 448   LayerAnimationController* layer_animation_controller() {
 449     return layer_animation_controller_.get();
 450   }
 451
 452   virtual Region VisibleContentOpaqueRegion() const;
 453
 454   virtual void DidBecomeActive();
 455
 456   virtual void DidBeginTracing();
 457
 458   // Indicates that the surface previously used to render this layer
 459   // was lost and that a new one has been created. Won't be called
 460   // until the new surface has been created successfully.
 461   virtual void DidLoseOutputSurface();
 462
 463   ScrollbarAnimationController* scrollbar_animation_controller() const {
 464     return scrollbar_animation_controller_.get();
 465   }
 466
 467   void SetHorizontalScrollbarLayer(ScrollbarLayerImplBase* scrollbar_layer);
 468   ScrollbarLayerImplBase* horizontal_scrollbar_layer() {
 469     return horizontal_scrollbar_layer_;
 470   }
 471
 472   void SetVerticalScrollbarLayer(ScrollbarLayerImplBase* scrollbar_layer);
 473   ScrollbarLayerImplBase* vertical_scrollbar_layer() {
 474     return vertical_scrollbar_layer_;
 475   }
 476
 477   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 478
 479   virtual skia::RefPtr<SkPicture> GetPicture();
 480
 481   virtual bool AreVisibleResourcesReady() const;
 482
 483   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 484   virtual void PushPropertiesTo(LayerImpl* layer);
 485
 486   scoped_ptr<base::Value> AsValue() const;
 487   virtual size_t GPUMemoryUsageInBytes() const;
 488
 489   // TODO(danakj): Be true only if needed. crbug.com/259511
 490   bool needs_push_properties() const { return true; }
 491   bool descendant_needs_push_properties() const { return true; }
 492
 493  protected:
 494   LayerImpl(LayerTreeImpl* layer_impl, int id);
 495
 496   // Get the color and size of the layer's debug border.
 497   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 498
 499   void AppendDebugBorderQuad(QuadSink* quad_sink,
 500                              const SharedQuadState* shared_quad_state,
 501                              AppendQuadsData* append_quads_data) const;
 502   void AppendDebugBorderQuad(QuadSink* quad_sink,
 503                              const SharedQuadState* shared_quad_state,
 504                              AppendQuadsData* append_quads_data,
 505                              SkColor color,
 506                              float width) const;
 507
 508   virtual void AsValueInto(base::DictionaryValue* dict) const;
 509
 510   void NoteLayerPropertyChanged();
 511   void NoteLayerPropertyChangedForSubtree();
 512
 513   // Note carefully this does not affect the current layer.
 514   void NoteLayerPropertyChangedForDescendants();
 515
 516  private:
 517   void UpdateScrollbarPositions();
 518
 519   virtual const char* LayerTypeAsString() const;
 520
 521   // Properties internal to LayerImpl
 522   LayerImpl* parent_;
 523   OwnedLayerImplList children_;
 524
 525   LayerImpl* scroll_parent_;
 526
 527   // Storing a pointer to a set rather than a set since this will be rarely
 528   // used. If this pointer turns out to be too heavy, we could have this (and
 529   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 530   // map somewhere.
 531   scoped_ptr<std::set<LayerImpl*> > scroll_children_;
 532
 533   LayerImpl* clip_parent_;
 534   scoped_ptr<std::set<LayerImpl*> > clip_children_;
 535
 536   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 537   // confirm newly assigned layer is still the previous one
 538   int mask_layer_id_;
 539   scoped_ptr<LayerImpl> mask_layer_;
 540   int replica_layer_id_;  // ditto
 541   scoped_ptr<LayerImpl> replica_layer_;
 542   int layer_id_;
 543   LayerTreeImpl* layer_tree_impl_;
 544
 545   // Properties synchronized from the associated Layer.
 546   gfx::PointF anchor_point_;
 547   float anchor_point_z_;
 548   gfx::Size bounds_;
 549   gfx::Vector2d scroll_offset_;
 550   LayerScrollOffsetDelegate* scroll_offset_delegate_;
 551   bool scrollable_;
 552   bool should_scroll_on_main_thread_;
 553   bool have_wheel_event_handlers_;
 554   bool user_scrollable_horizontal_;
 555   bool user_scrollable_vertical_;
 556   Region non_fast_scrollable_region_;
 557   Region touch_event_handler_region_;
 558   SkColor background_color_;
 559   bool stacking_order_changed_;
 560
 561   // Whether the "back" of this layer should draw.
 562   bool double_sided_;
 563
 564   // Tracks if drawing-related properties have changed since last redraw.
 565   bool layer_property_changed_;
 566
 567   bool masks_to_bounds_;
 568   bool contents_opaque_;
 569   float opacity_;
 570   gfx::PointF position_;
 571   bool preserves_3d_;
 572   bool use_parent_backface_visibility_;
 573   bool draw_checkerboard_for_missing_tiles_;
 574   gfx::Transform sublayer_transform_;
 575   gfx::Transform transform_;
 576
 577   bool draws_content_;
 578   bool hide_layer_and_subtree_;
 579   bool force_render_surface_;
 580
 581   // Set for the layer that other layers are fixed to.
 582   bool is_container_for_fixed_position_layers_;
 583   // This property is effective when
 584   // is_container_for_fixed_position_layers_ == true,
 585   gfx::Vector2dF fixed_container_size_delta_;
 586
 587   LayerPositionConstraint position_constraint_;
 588
 589   gfx::Vector2dF scroll_delta_;
 590   gfx::Vector2d sent_scroll_delta_;
 591   gfx::Vector2d max_scroll_offset_;
 592   gfx::Vector2dF last_scroll_offset_;
 593
 594   // The global depth value of the center of the layer. This value is used
 595   // to sort layers from back to front.
 596   float draw_depth_;
 597
 598   // Debug layer name.
 599   std::string debug_name_;
 600   CompositingReasons compositing_reasons_;
 601
 602   FilterOperations filters_;
 603   FilterOperations background_filters_;
 604
 605  protected:
 606   DrawMode current_draw_mode_;
 607
 608  private:
 609   // Rect indicating what was repainted/updated during update.
 610   // Note that plugin layers bypass this and leave it empty.
 611   // Uses layer's content space.
 612   gfx::RectF update_rect_;
 613
 614   // Manages animations for this layer.
 615   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 616
 617   // Manages scrollbars for this layer
 618   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 619
 620   // Weak pointers to this layer's scrollbars, if it has them. Updated during
 621   // tree synchronization.
 622   ScrollbarLayerImplBase* horizontal_scrollbar_layer_;
 623   ScrollbarLayerImplBase* vertical_scrollbar_layer_;
 624
 625   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 626
 627   // Group of properties that need to be computed based on the layer tree
 628   // hierarchy before layers can be drawn.
 629   DrawProperties<LayerImpl> draw_properties_;
 630
 631   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 632 };
 633
 634 }  // namespace cc
 635
 636 #endif  // CC_LAYERS_LAYER_IMPL_H_