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/animation_delegate.h"
  15 #include "cc/animation/layer_animation_controller.h"
  16 #include "cc/animation/layer_animation_value_observer.h"
  17 #include "cc/animation/layer_animation_value_provider.h"
  18 #include "cc/base/cc_export.h"
  19 #include "cc/base/region.h"
  20 #include "cc/base/scoped_ptr_vector.h"
  21 #include "cc/input/input_handler.h"
  22 #include "cc/input/scrollbar.h"
  23 #include "cc/layers/draw_properties.h"
  24 #include "cc/layers/layer_lists.h"
  25 #include "cc/layers/layer_position_constraint.h"
  26 #include "cc/layers/render_surface_impl.h"
  27 #include "cc/output/filter_operations.h"
  28 #include "cc/quads/shared_quad_state.h"
  29 #include "cc/resources/resource_provider.h"
  30 #include "skia/ext/refptr.h"
  31 #include "third_party/skia/include/core/SkColor.h"
  32 #include "third_party/skia/include/core/SkImageFilter.h"
  33 #include "third_party/skia/include/core/SkPicture.h"
  34 #include "ui/gfx/geometry/point3_f.h"
  35 #include "ui/gfx/geometry/rect.h"
  36 #include "ui/gfx/geometry/rect_f.h"
  37 #include "ui/gfx/geometry/scroll_offset.h"
  38 #include "ui/gfx/transform.h"
  39
  40 namespace base {
  41 namespace debug {
  42 class ConvertableToTraceFormat;
  43 class TracedValue;
  44 }
  45
  46 class DictionaryValue;
  47 }
  48
  49 namespace cc {
  50
  51 class LayerTreeHostImpl;
  52 class LayerTreeImpl;
  53 class MicroBenchmarkImpl;
  54 class Occlusion;
  55 template <typename LayerType>
  56 class OcclusionTracker;
  57 class RenderPass;
  58 class RenderPassId;
  59 class Renderer;
  60 class ScrollbarAnimationController;
  61 class ScrollbarLayerImplBase;
  62 class SimpleEnclosedRegion;
  63 class Tile;
  64
  65 struct AppendQuadsData;
  66
  67 enum DrawMode {
  68   DRAW_MODE_NONE,
  69   DRAW_MODE_HARDWARE,
  70   DRAW_MODE_SOFTWARE,
  71   DRAW_MODE_RESOURCELESS_SOFTWARE
  72 };
  73
  74 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
  75                             public LayerAnimationValueProvider,
  76                             public AnimationDelegate {
  77  public:
  78   // Allows for the ownership of the total scroll offset to be delegated outside
  79   // of the layer.
  80   class ScrollOffsetDelegate {
  81    public:
  82     virtual void SetTotalScrollOffset(const gfx::ScrollOffset& new_value) = 0;
  83     virtual gfx::ScrollOffset GetTotalScrollOffset() = 0;
  84     virtual bool IsExternalFlingActive() const = 0;
  85     virtual void Update() const = 0;
  86   };
  87
  88   typedef LayerImplList RenderSurfaceListType;
  89   typedef LayerImplList LayerListType;
  90   typedef RenderSurfaceImpl RenderSurfaceType;
  91
  92   enum RenderingContextConstants { NO_RENDERING_CONTEXT = 0 };
  93
  94   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
  95     return make_scoped_ptr(new LayerImpl(tree_impl, id));
  96   }
  97
  98   ~LayerImpl() override;
  99
 100   int id() const { return layer_id_; }
 101
 102   // LayerAnimationValueProvider implementation.
 103   gfx::ScrollOffset ScrollOffsetForAnimation() const override;
 104
 105   // LayerAnimationValueObserver implementation.
 106   void OnFilterAnimated(const FilterOperations& filters) override;
 107   void OnOpacityAnimated(float opacity) override;
 108   void OnTransformAnimated(const gfx::Transform& transform) override;
 109   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
 110   void OnAnimationWaitingForDeletion() override;
 111   bool IsActive() const override;
 112
 113   // AnimationDelegate implementation.
 114   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
 115                               Animation::TargetProperty target_property,
 116                               int group) override{};
 117   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
 118                                Animation::TargetProperty target_property,
 119                                int group) override;
 120
 121   // Tree structure.
 122   LayerImpl* parent() { return parent_; }
 123   const LayerImpl* parent() const { return parent_; }
 124   const OwnedLayerImplList& children() const { return children_; }
 125   OwnedLayerImplList& children() { return children_; }
 126   LayerImpl* child_at(size_t index) const { return children_[index]; }
 127   void AddChild(scoped_ptr<LayerImpl> child);
 128   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
 129   void SetParent(LayerImpl* parent);
 130
 131   // Warning: This does not preserve tree structure invariants.
 132   void ClearChildList();
 133
 134   bool HasAncestor(const LayerImpl* ancestor) const;
 135
 136   void SetScrollParent(LayerImpl* parent);
 137
 138   LayerImpl* scroll_parent() { return scroll_parent_; }
 139   const LayerImpl* scroll_parent() const { return scroll_parent_; }
 140
 141   void SetScrollChildren(std::set<LayerImpl*>* children);
 142
 143   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 144   const std::set<LayerImpl*>* scroll_children() const {
 145     return scroll_children_.get();
 146   }
 147
 148   void SetNumDescendantsThatDrawContent(int num_descendants);
 149   void SetClipParent(LayerImpl* ancestor);
 150
 151   LayerImpl* clip_parent() {
 152     return clip_parent_;
 153   }
 154   const LayerImpl* clip_parent() const {
 155     return clip_parent_;
 156   }
 157
 158   void SetClipChildren(std::set<LayerImpl*>* children);
 159
 160   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 161   const std::set<LayerImpl*>* clip_children() const {
 162     return clip_children_.get();
 163   }
 164
 165   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 166   // Can only be called when the layer has a copy request.
 167   void TakeCopyRequestsAndTransformToTarget(
 168       ScopedPtrVector<CopyOutputRequest>* request);
 169   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 170
 171   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 172   LayerImpl* mask_layer() { return mask_layer_.get(); }
 173   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 174   scoped_ptr<LayerImpl> TakeMaskLayer();
 175
 176   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 177   LayerImpl* replica_layer() { return replica_layer_.get(); }
 178   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 179   scoped_ptr<LayerImpl> TakeReplicaLayer();
 180
 181   bool has_mask() const { return mask_layer_; }
 182   bool has_replica() const { return replica_layer_; }
 183   bool replica_has_mask() const {
 184     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 185   }
 186
 187   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 188
 189   void PopulateSharedQuadState(SharedQuadState* state) const;
 190   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 191   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 192   // DidDraw is guaranteed to be called before another WillDraw or before
 193   // the layer is destroyed. To enforce this, any class that overrides
 194   // WillDraw/DidDraw must call the base class version only if WillDraw
 195   // returns true.
 196   virtual bool WillDraw(DrawMode draw_mode,
 197                         ResourceProvider* resource_provider);
 198   virtual void AppendQuads(RenderPass* render_pass,
 199                            const Occlusion& occlusion_in_content_space,
 200                            AppendQuadsData* append_quads_data) {}
 201   virtual void DidDraw(ResourceProvider* resource_provider);
 202
 203   virtual void GetContentsResourceId(ResourceProvider::ResourceId* resource_id,
 204                                      gfx::Size* resource_size) const;
 205
 206   virtual bool HasDelegatedContent() const;
 207   virtual bool HasContributingDelegatedRenderPasses() const;
 208   virtual RenderPassId FirstContributingRenderPassId() const;
 209   virtual RenderPassId NextContributingRenderPassId(RenderPassId id) const;
 210
 211   // Updates the layer's tiles. This should return true if meaningful work was
 212   // done. That is, if an early-out was hit and as a result the internal state
 213   // of tiles didn't change, this function should return false.
 214   virtual bool UpdateTiles(const Occlusion& occlusion_in_layer_space,
 215                            bool resourceless_software_draw);
 216   virtual void NotifyTileStateChanged(const Tile* tile) {}
 217
 218   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 219
 220   // Returns true if this layer has content to draw.
 221   void SetDrawsContent(bool draws_content);
 222   bool DrawsContent() const { return draws_content_; }
 223
 224   int NumDescendantsThatDrawContent() const;
 225   void SetHideLayerAndSubtree(bool hide);
 226   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 227
 228   void SetTransformOrigin(const gfx::Point3F& transform_origin);
 229   gfx::Point3F transform_origin() const { return transform_origin_; }
 230
 231   void SetBackgroundColor(SkColor background_color);
 232   SkColor background_color() const { return background_color_; }
 233   // If contents_opaque(), return an opaque color else return a
 234   // non-opaque color.  Tries to return background_color(), if possible.
 235   SkColor SafeOpaqueBackgroundColor() const;
 236
 237   void SetFilters(const FilterOperations& filters);
 238   const FilterOperations& filters() const { return filters_; }
 239   bool FilterIsAnimating() const;
 240   bool FilterIsAnimatingOnImplOnly() const;
 241
 242   void SetBackgroundFilters(const FilterOperations& filters);
 243   const FilterOperations& background_filters() const {
 244     return background_filters_;
 245   }
 246
 247   void SetMasksToBounds(bool masks_to_bounds);
 248   bool masks_to_bounds() const { return masks_to_bounds_; }
 249
 250   void SetContentsOpaque(bool opaque);
 251   bool contents_opaque() const { return contents_opaque_; }
 252
 253   void SetOpacity(float opacity);
 254   float opacity() const { return opacity_; }
 255   bool OpacityIsAnimating() const;
 256   bool OpacityIsAnimatingOnImplOnly() const;
 257
 258   void SetBlendMode(SkXfermode::Mode);
 259   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 260   bool uses_default_blend_mode() const {
 261     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 262   }
 263
 264   void SetIsRootForIsolatedGroup(bool root);
 265   bool is_root_for_isolated_group() const {
 266     return is_root_for_isolated_group_;
 267   }
 268
 269   void SetPosition(const gfx::PointF& position);
 270   gfx::PointF position() const { return position_; }
 271
 272   void SetIsContainerForFixedPositionLayers(bool container) {
 273     is_container_for_fixed_position_layers_ = container;
 274   }
 275   // This is a non-trivial function in Layer.
 276   bool IsContainerForFixedPositionLayers() const {
 277     return is_container_for_fixed_position_layers_;
 278   }
 279
 280   gfx::Vector2dF FixedContainerSizeDelta() const;
 281
 282   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 283     position_constraint_ = constraint;
 284   }
 285   const LayerPositionConstraint& position_constraint() const {
 286     return position_constraint_;
 287   }
 288
 289   void SetShouldFlattenTransform(bool flatten);
 290   bool should_flatten_transform() const { return should_flatten_transform_; }
 291
 292   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 293
 294   void SetUseParentBackfaceVisibility(bool use) {
 295     use_parent_backface_visibility_ = use;
 296   }
 297   bool use_parent_backface_visibility() const {
 298     return use_parent_backface_visibility_;
 299   }
 300
 301   bool ShowDebugBorders() const;
 302
 303   // These invalidate the host's render surface layer list.  The caller
 304   // is responsible for calling set_needs_update_draw_properties on the tree
 305   // so that its list can be recreated.
 306   void ClearRenderSurfaceLayerList();
 307   void SetHasRenderSurface(bool has_render_surface);
 308
 309   RenderSurfaceImpl* render_surface() const { return render_surface_.get(); }
 310
 311   DrawProperties<LayerImpl>& draw_properties() {
 312     return draw_properties_;
 313   }
 314   const DrawProperties<LayerImpl>& draw_properties() const {
 315     return draw_properties_;
 316   }
 317
 318   // The following are shortcut accessors to get various information from
 319   // draw_properties_
 320   const gfx::Transform& draw_transform() const {
 321     return draw_properties_.target_space_transform;
 322   }
 323   const gfx::Transform& screen_space_transform() const {
 324     return draw_properties_.screen_space_transform;
 325   }
 326   float draw_opacity() const { return draw_properties_.opacity; }
 327   SkXfermode::Mode draw_blend_mode() const {
 328     return draw_properties_.blend_mode;
 329   }
 330   bool draw_opacity_is_animating() const {
 331     return draw_properties_.opacity_is_animating;
 332   }
 333   bool draw_transform_is_animating() const {
 334     return draw_properties_.target_space_transform_is_animating;
 335   }
 336   bool screen_space_transform_is_animating() const {
 337     return draw_properties_.screen_space_transform_is_animating;
 338   }
 339   bool screen_space_opacity_is_animating() const {
 340     return draw_properties_.screen_space_opacity_is_animating;
 341   }
 342   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 343   bool is_clipped() const { return draw_properties_.is_clipped; }
 344   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 345   gfx::Rect drawable_content_rect() const {
 346     return draw_properties_.drawable_content_rect;
 347   }
 348   gfx::Rect visible_content_rect() const {
 349     return draw_properties_.visible_content_rect;
 350   }
 351   LayerImpl* render_target() {
 352     DCHECK(!draw_properties_.render_target ||
 353            draw_properties_.render_target->render_surface());
 354     return draw_properties_.render_target;
 355   }
 356   const LayerImpl* render_target() const {
 357     DCHECK(!draw_properties_.render_target ||
 358            draw_properties_.render_target->render_surface());
 359     return draw_properties_.render_target;
 360   }
 361
 362   int num_unclipped_descendants() const {
 363     return draw_properties_.num_unclipped_descendants;
 364   }
 365
 366   // The client should be responsible for setting bounds, content bounds and
 367   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 368   // them from the other values.
 369
 370   void SetBounds(const gfx::Size& bounds);
 371   gfx::Size bounds() const;
 372   // Like bounds() but doesn't snap to int. Lossy on giant pages (e.g. millions
 373   // of pixels) due to use of single precision float.
 374   gfx::SizeF BoundsForScrolling() const;
 375   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
 376   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 377
 378   void SetContentBounds(const gfx::Size& content_bounds);
 379   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 380
 381   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 382   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 383   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 384
 385   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
 386   void DidScroll();
 387   bool IsExternalFlingActive() const;
 388
 389   void SetScrollOffset(const gfx::ScrollOffset& scroll_offset);
 390   void SetScrollOffsetAndDelta(const gfx::ScrollOffset& scroll_offset,
 391                                const gfx::Vector2dF& scroll_delta);
 392   gfx::ScrollOffset scroll_offset() const { return scroll_offset_; }
 393
 394   gfx::ScrollOffset MaxScrollOffset() const;
 395   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 396   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 397                             LayerImpl* scrollbar_clip_layer,
 398                             bool on_resize) const;
 399   void SetScrollDelta(const gfx::Vector2dF& scroll_delta);
 400   gfx::Vector2dF ScrollDelta() const;
 401
 402   gfx::ScrollOffset TotalScrollOffset() const;
 403
 404   void SetSentScrollDelta(const gfx::Vector2dF& sent_scroll_delta);
 405   gfx::Vector2dF sent_scroll_delta() const { return sent_scroll_delta_; }
 406
 407   // Returns the delta of the scroll that was outside of the bounds of the
 408   // initial scroll
 409   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 410
 411   void SetScrollClipLayer(int scroll_clip_layer_id);
 412   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 413   bool scrollable() const { return !!scroll_clip_layer_; }
 414
 415   void set_user_scrollable_horizontal(bool scrollable) {
 416     user_scrollable_horizontal_ = scrollable;
 417   }
 418   bool user_scrollable_horizontal() const {
 419     return user_scrollable_horizontal_;
 420   }
 421   void set_user_scrollable_vertical(bool scrollable) {
 422     user_scrollable_vertical_ = scrollable;
 423   }
 424   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 425
 426   bool user_scrollable(ScrollbarOrientation orientation) const;
 427
 428   void ApplySentScrollDeltasFromAbortedCommit();
 429   void ApplyScrollDeltasSinceBeginMainFrame();
 430
 431   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 432     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 433   }
 434   bool should_scroll_on_main_thread() const {
 435     return should_scroll_on_main_thread_;
 436   }
 437
 438   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 439     have_wheel_event_handlers_ = have_wheel_event_handlers;
 440   }
 441   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 442
 443   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 444     have_scroll_event_handlers_ = have_scroll_event_handlers;
 445   }
 446   bool have_scroll_event_handlers() const {
 447     return have_scroll_event_handlers_;
 448   }
 449
 450   void SetNonFastScrollableRegion(const Region& region) {
 451     non_fast_scrollable_region_ = region;
 452   }
 453   const Region& non_fast_scrollable_region() const {
 454     return non_fast_scrollable_region_;
 455   }
 456
 457   void SetTouchEventHandlerRegion(const Region& region) {
 458     touch_event_handler_region_ = region;
 459   }
 460   const Region& touch_event_handler_region() const {
 461     return touch_event_handler_region_;
 462   }
 463
 464   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 465     draw_checkerboard_for_missing_tiles_ = checkerboard;
 466   }
 467   bool draw_checkerboard_for_missing_tiles() const {
 468     return draw_checkerboard_for_missing_tiles_;
 469   }
 470
 471   InputHandler::ScrollStatus TryScroll(
 472       const gfx::PointF& screen_space_point,
 473       InputHandler::ScrollInputType type) const;
 474
 475   void SetDoubleSided(bool double_sided);
 476   bool double_sided() const { return double_sided_; }
 477
 478   void SetTransform(const gfx::Transform& transform);
 479   const gfx::Transform& transform() const { return transform_; }
 480   bool TransformIsAnimating() const;
 481   bool TransformIsAnimatingOnImplOnly() const;
 482   void SetTransformAndInvertibility(const gfx::Transform& transform,
 483                                     bool transform_is_invertible);
 484   bool transform_is_invertible() const { return transform_is_invertible_; }
 485
 486   // Note this rect is in layer space (not content space).
 487   void SetUpdateRect(const gfx::Rect& update_rect);
 488   gfx::Rect update_rect() const { return update_rect_; }
 489
 490   void AddDamageRect(const gfx::RectF& damage_rect);
 491
 492   const gfx::RectF& damage_rect() const { return damage_rect_; }
 493
 494   virtual base::DictionaryValue* LayerTreeAsJson() const;
 495
 496   void SetStackingOrderChanged(bool stacking_order_changed);
 497
 498   bool LayerPropertyChanged() const { return layer_property_changed_; }
 499
 500   void ResetAllChangeTrackingForSubtree();
 501
 502   LayerAnimationController* layer_animation_controller() {
 503     return layer_animation_controller_.get();
 504   }
 505
 506   const LayerAnimationController* layer_animation_controller() const {
 507     return layer_animation_controller_.get();
 508   }
 509
 510   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
 511
 512   virtual void DidBecomeActive();
 513
 514   virtual void DidBeginTracing();
 515
 516   // Release resources held by this layer. Called when the output surface
 517   // that rendered this layer was lost or a rendering mode switch has occured.
 518   virtual void ReleaseResources();
 519
 520   ScrollbarAnimationController* scrollbar_animation_controller() const {
 521     return scrollbar_animation_controller_.get();
 522   }
 523
 524   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 525   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 526   void ClearScrollbars();
 527   void AddScrollbar(ScrollbarLayerImplBase* layer);
 528   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 529   bool HasScrollbar(ScrollbarOrientation orientation) const;
 530   void ScrollbarParametersDidChange(bool on_resize);
 531   int clip_height() {
 532     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 533   }
 534
 535   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 536
 537   virtual skia::RefPtr<SkPicture> GetPicture();
 538
 539   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 540   virtual void PushPropertiesTo(LayerImpl* layer);
 541
 542   virtual void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
 543   virtual void AsValueInto(base::debug::TracedValue* dict) const;
 544
 545   virtual size_t GPUMemoryUsageInBytes() const;
 546
 547   void SetNeedsPushProperties();
 548   void AddDependentNeedsPushProperties();
 549   void RemoveDependentNeedsPushProperties();
 550   bool parent_should_know_need_push_properties() const {
 551     return needs_push_properties() || descendant_needs_push_properties();
 552   }
 553
 554   bool needs_push_properties() const { return needs_push_properties_; }
 555   bool descendant_needs_push_properties() const {
 556     return num_dependents_need_push_properties_ > 0;
 557   }
 558
 559   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 560
 561   virtual void SetDebugInfo(
 562       scoped_refptr<base::debug::ConvertableToTraceFormat> other);
 563
 564   bool IsDrawnRenderSurfaceLayerListMember() const;
 565
 566   void Set3dSortingContextId(int id);
 567   int sorting_context_id() { return sorting_context_id_; }
 568
 569  protected:
 570   LayerImpl(LayerTreeImpl* layer_impl, int id);
 571
 572   // Get the color and size of the layer's debug border.
 573   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 574
 575   void AppendDebugBorderQuad(RenderPass* render_pass,
 576                              const gfx::Size& content_bounds,
 577                              const SharedQuadState* shared_quad_state,
 578                              AppendQuadsData* append_quads_data) const;
 579   void AppendDebugBorderQuad(RenderPass* render_pass,
 580                              const gfx::Size& content_bounds,
 581                              const SharedQuadState* shared_quad_state,
 582                              AppendQuadsData* append_quads_data,
 583                              SkColor color,
 584                              float width) const;
 585
 586   void NoteLayerPropertyChanged();
 587   void NoteLayerPropertyChangedForSubtree();
 588
 589   // Note carefully this does not affect the current layer.
 590   void NoteLayerPropertyChangedForDescendants();
 591
 592  private:
 593   void NoteLayerPropertyChangedForDescendantsInternal();
 594
 595   virtual const char* LayerTypeAsString() const;
 596
 597   // Properties internal to LayerImpl
 598   LayerImpl* parent_;
 599   OwnedLayerImplList children_;
 600
 601   LayerImpl* scroll_parent_;
 602
 603   // Storing a pointer to a set rather than a set since this will be rarely
 604   // used. If this pointer turns out to be too heavy, we could have this (and
 605   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 606   // map somewhere.
 607   scoped_ptr<std::set<LayerImpl*>> scroll_children_;
 608
 609   LayerImpl* clip_parent_;
 610   scoped_ptr<std::set<LayerImpl*>> clip_children_;
 611
 612   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 613   // confirm newly assigned layer is still the previous one
 614   int mask_layer_id_;
 615   scoped_ptr<LayerImpl> mask_layer_;
 616   int replica_layer_id_;  // ditto
 617   scoped_ptr<LayerImpl> replica_layer_;
 618   int layer_id_;
 619   LayerTreeImpl* layer_tree_impl_;
 620
 621   // Properties synchronized from the associated Layer.
 622   gfx::Point3F transform_origin_;
 623   gfx::Size bounds_;
 624   gfx::Vector2dF bounds_delta_;
 625   gfx::ScrollOffset scroll_offset_;
 626   ScrollOffsetDelegate* scroll_offset_delegate_;
 627   LayerImpl* scroll_clip_layer_;
 628   bool scrollable_ : 1;
 629   bool should_scroll_on_main_thread_ : 1;
 630   bool have_wheel_event_handlers_ : 1;
 631   bool have_scroll_event_handlers_ : 1;
 632   bool user_scrollable_horizontal_ : 1;
 633   bool user_scrollable_vertical_ : 1;
 634   bool stacking_order_changed_ : 1;
 635   // Whether the "back" of this layer should draw.
 636   bool double_sided_ : 1;
 637   bool should_flatten_transform_ : 1;
 638
 639   // Tracks if drawing-related properties have changed since last redraw.
 640   bool layer_property_changed_ : 1;
 641
 642   bool masks_to_bounds_ : 1;
 643   bool contents_opaque_ : 1;
 644   bool is_root_for_isolated_group_ : 1;
 645   bool use_parent_backface_visibility_ : 1;
 646   bool draw_checkerboard_for_missing_tiles_ : 1;
 647   bool draws_content_ : 1;
 648   bool hide_layer_and_subtree_ : 1;
 649
 650   // Cache transform_'s invertibility.
 651   bool transform_is_invertible_ : 1;
 652
 653   // Set for the layer that other layers are fixed to.
 654   bool is_container_for_fixed_position_layers_ : 1;
 655   Region non_fast_scrollable_region_;
 656   Region touch_event_handler_region_;
 657   SkColor background_color_;
 658
 659   float opacity_;
 660   SkXfermode::Mode blend_mode_;
 661   gfx::PointF position_;
 662   gfx::Transform transform_;
 663
 664   LayerPositionConstraint position_constraint_;
 665
 666   gfx::Vector2dF scroll_delta_;
 667   gfx::Vector2dF sent_scroll_delta_;
 668   gfx::ScrollOffset last_scroll_offset_;
 669
 670   int num_descendants_that_draw_content_;
 671
 672   // The global depth value of the center of the layer. This value is used
 673   // to sort layers from back to front.
 674   float draw_depth_;
 675
 676   FilterOperations filters_;
 677   FilterOperations background_filters_;
 678
 679  protected:
 680   friend class TreeSynchronizer;
 681
 682   // This flag is set when the layer needs to push properties to the active
 683   // side.
 684   bool needs_push_properties_;
 685
 686   // The number of direct children or dependent layers that need to be recursed
 687   // to in order for them or a descendent of them to push properties to the
 688   // active side.
 689   int num_dependents_need_push_properties_;
 690
 691   // Layers that share a sorting context id will be sorted together in 3d
 692   // space.  0 is a special value that means this layer will not be sorted and
 693   // will be drawn in paint order.
 694   int sorting_context_id_;
 695
 696   DrawMode current_draw_mode_;
 697
 698  private:
 699   // Rect indicating what was repainted/updated during update.
 700   // Note that plugin layers bypass this and leave it empty.
 701   // Uses layer (not content) space.
 702   gfx::Rect update_rect_;
 703
 704   // This rect is in layer space.
 705   gfx::RectF damage_rect_;
 706
 707   // Manages animations for this layer.
 708   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 709
 710   // Manages scrollbars for this layer
 711   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 712
 713   scoped_ptr<ScrollbarSet> scrollbars_;
 714
 715   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 716
 717   // Group of properties that need to be computed based on the layer tree
 718   // hierarchy before layers can be drawn.
 719   DrawProperties<LayerImpl> draw_properties_;
 720
 721   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 722   scoped_ptr<RenderSurfaceImpl> render_surface_;
 723   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 724 };
 725
 726 }  // namespace cc
 727
 728 #endif  // CC_LAYERS_LAYER_IMPL_H_