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