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/layers/draw_properties.h"
  23 #include "cc/layers/layer_lists.h"
  24 #include "cc/layers/layer_position_constraint.h"
  25 #include "cc/layers/render_surface_impl.h"
  26 #include "cc/output/filter_operations.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 class TracedValue;
  42 }
  43
  44 class DictionaryValue;
  45 }
  46
  47 namespace cc {
  48
  49 class LayerTreeHostImpl;
  50 class LayerTreeImpl;
  51 class MicroBenchmarkImpl;
  52 class Occlusion;
  53 template <typename LayerType>
  54 class OcclusionTracker;
  55 class RenderPass;
  56 class RenderPassId;
  57 class Renderer;
  58 class ScrollbarAnimationController;
  59 class ScrollbarLayerImplBase;
  60 class SimpleEnclosedRegion;
  61 class Tile;
  62
  63 struct AppendQuadsData;
  64
  65 enum DrawMode {
  66   DRAW_MODE_NONE,
  67   DRAW_MODE_HARDWARE,
  68   DRAW_MODE_SOFTWARE,
  69   DRAW_MODE_RESOURCELESS_SOFTWARE
  70 };
  71
  72 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
  73                             public LayerAnimationValueProvider,
  74                             public AnimationDelegate {
  75  public:
  76   // Allows for the ownership of the total scroll offset to be delegated outside
  77   // of the layer.
  78   class ScrollOffsetDelegate {
  79    public:
  80     virtual void SetTotalScrollOffset(const gfx::Vector2dF& new_value) = 0;
  81     virtual gfx::Vector2dF GetTotalScrollOffset() = 0;
  82     virtual bool IsExternalFlingActive() const = 0;
  83   };
  84
  85   typedef LayerImplList RenderSurfaceListType;
  86   typedef LayerImplList LayerListType;
  87   typedef RenderSurfaceImpl RenderSurfaceType;
  88
  89   enum RenderingContextConstants { NO_RENDERING_CONTEXT = 0 };
  90
  91   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
  92     return make_scoped_ptr(new LayerImpl(tree_impl, id));
  93   }
  94
  95   virtual ~LayerImpl();
  96
  97   int id() const { return layer_id_; }
  98
  99   // LayerAnimationValueProvider implementation.
 100   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
 101
 102   // LayerAnimationValueObserver implementation.
 103   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
 104   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
 105   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
 106   virtual void OnScrollOffsetAnimated(
 107       const gfx::Vector2dF& scroll_offset) OVERRIDE;
 108   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
 109   virtual bool IsActive() const OVERRIDE;
 110
 111   // AnimationDelegate implementation.
 112   virtual void NotifyAnimationStarted(
 113       base::TimeTicks monotonic_time,
 114       Animation::TargetProperty target_property) OVERRIDE{};
 115   virtual void NotifyAnimationFinished(
 116       base::TimeTicks monotonic_time,
 117       Animation::TargetProperty target_property) OVERRIDE;
 118
 119   // Tree structure.
 120   LayerImpl* parent() { return parent_; }
 121   const LayerImpl* parent() const { return parent_; }
 122   const OwnedLayerImplList& children() const { return children_; }
 123   OwnedLayerImplList& children() { return children_; }
 124   LayerImpl* child_at(size_t index) const { return children_[index]; }
 125   void AddChild(scoped_ptr<LayerImpl> child);
 126   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
 127   void SetParent(LayerImpl* parent);
 128
 129   // Warning: This does not preserve tree structure invariants.
 130   void ClearChildList();
 131
 132   bool HasAncestor(const LayerImpl* ancestor) const;
 133
 134   void SetScrollParent(LayerImpl* parent);
 135
 136   LayerImpl* scroll_parent() { return scroll_parent_; }
 137   const LayerImpl* scroll_parent() const { return scroll_parent_; }
 138
 139   void SetScrollChildren(std::set<LayerImpl*>* children);
 140
 141   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 142   const std::set<LayerImpl*>* scroll_children() const {
 143     return scroll_children_.get();
 144   }
 145
 146   void SetNumDescendantsThatDrawContent(int num_descendants);
 147   void SetClipParent(LayerImpl* ancestor);
 148
 149   LayerImpl* clip_parent() {
 150     return clip_parent_;
 151   }
 152   const LayerImpl* clip_parent() const {
 153     return clip_parent_;
 154   }
 155
 156   void SetClipChildren(std::set<LayerImpl*>* children);
 157
 158   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 159   const std::set<LayerImpl*>* clip_children() const {
 160     return clip_children_.get();
 161   }
 162
 163   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 164   // Can only be called when the layer has a copy request.
 165   void TakeCopyRequestsAndTransformToTarget(
 166       ScopedPtrVector<CopyOutputRequest>* request);
 167   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 168
 169   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 170   LayerImpl* mask_layer() { return mask_layer_.get(); }
 171   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 172   scoped_ptr<LayerImpl> TakeMaskLayer();
 173
 174   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 175   LayerImpl* replica_layer() { return replica_layer_.get(); }
 176   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 177   scoped_ptr<LayerImpl> TakeReplicaLayer();
 178
 179   bool has_mask() const { return mask_layer_; }
 180   bool has_replica() const { return replica_layer_; }
 181   bool replica_has_mask() const {
 182     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 183   }
 184
 185   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 186
 187   void PopulateSharedQuadState(SharedQuadState* state) const;
 188   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 189   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 190   // DidDraw is guaranteed to be called before another WillDraw or before
 191   // the layer is destroyed. To enforce this, any class that overrides
 192   // WillDraw/DidDraw must call the base class version only if WillDraw
 193   // returns true.
 194   virtual bool WillDraw(DrawMode draw_mode,
 195                         ResourceProvider* resource_provider);
 196   virtual void AppendQuads(RenderPass* render_pass,
 197                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
 198                            AppendQuadsData* append_quads_data) {}
 199   virtual void DidDraw(ResourceProvider* resource_provider);
 200
 201   virtual ResourceProvider::ResourceId ContentsResourceId() const;
 202
 203   virtual bool HasDelegatedContent() const;
 204   virtual bool HasContributingDelegatedRenderPasses() const;
 205   virtual RenderPassId FirstContributingRenderPassId() const;
 206   virtual RenderPassId NextContributingRenderPassId(RenderPassId id) const;
 207
 208   virtual void UpdateTiles(const Occlusion& occlusion_in_layer_space) {}
 209   virtual void NotifyTileStateChanged(const Tile* tile) {}
 210
 211   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 212
 213   // Returns true if this layer has content to draw.
 214   void SetDrawsContent(bool draws_content);
 215   bool DrawsContent() const { return draws_content_; }
 216
 217   int NumDescendantsThatDrawContent() const;
 218   void SetHideLayerAndSubtree(bool hide);
 219   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 220
 221   bool force_render_surface() const { return force_render_surface_; }
 222   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 223
 224   void SetTransformOrigin(const gfx::Point3F& transform_origin);
 225   gfx::Point3F transform_origin() const { return transform_origin_; }
 226
 227   void SetBackgroundColor(SkColor background_color);
 228   SkColor background_color() const { return background_color_; }
 229   // If contents_opaque(), return an opaque color else return a
 230   // non-opaque color.  Tries to return background_color(), if possible.
 231   SkColor SafeOpaqueBackgroundColor() const;
 232
 233   void SetFilters(const FilterOperations& filters);
 234   const FilterOperations& filters() const { return filters_; }
 235   bool FilterIsAnimating() const;
 236   bool FilterIsAnimatingOnImplOnly() const;
 237
 238   void SetBackgroundFilters(const FilterOperations& filters);
 239   const FilterOperations& background_filters() const {
 240     return background_filters_;
 241   }
 242
 243   void SetMasksToBounds(bool masks_to_bounds);
 244   bool masks_to_bounds() const { return masks_to_bounds_; }
 245
 246   void SetContentsOpaque(bool opaque);
 247   bool contents_opaque() const { return contents_opaque_; }
 248
 249   void SetOpacity(float opacity);
 250   float opacity() const { return opacity_; }
 251   bool OpacityIsAnimating() const;
 252   bool OpacityIsAnimatingOnImplOnly() const;
 253
 254   void SetBlendMode(SkXfermode::Mode);
 255   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 256   bool uses_default_blend_mode() const {
 257     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 258   }
 259
 260   void SetIsRootForIsolatedGroup(bool root);
 261   bool is_root_for_isolated_group() const {
 262     return is_root_for_isolated_group_;
 263   }
 264
 265   void SetPosition(const gfx::PointF& position);
 266   gfx::PointF position() const { return position_; }
 267
 268   void SetIsContainerForFixedPositionLayers(bool container) {
 269     is_container_for_fixed_position_layers_ = container;
 270   }
 271   // This is a non-trivial function in Layer.
 272   bool IsContainerForFixedPositionLayers() const {
 273     return is_container_for_fixed_position_layers_;
 274   }
 275
 276   gfx::Vector2dF FixedContainerSizeDelta() const;
 277
 278   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 279     position_constraint_ = constraint;
 280   }
 281   const LayerPositionConstraint& position_constraint() const {
 282     return position_constraint_;
 283   }
 284
 285   void SetShouldFlattenTransform(bool flatten);
 286   bool should_flatten_transform() const { return should_flatten_transform_; }
 287
 288   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 289
 290   void SetUseParentBackfaceVisibility(bool use) {
 291     use_parent_backface_visibility_ = use;
 292   }
 293   bool use_parent_backface_visibility() const {
 294     return use_parent_backface_visibility_;
 295   }
 296
 297   bool ShowDebugBorders() const;
 298
 299   // These invalidate the host's render surface layer list.  The caller
 300   // is responsible for calling set_needs_update_draw_properties on the tree
 301   // so that its list can be recreated.
 302   void CreateRenderSurface();
 303   void ClearRenderSurface();
 304   void ClearRenderSurfaceLayerList();
 305
 306   DrawProperties<LayerImpl>& draw_properties() {
 307     return draw_properties_;
 308   }
 309   const DrawProperties<LayerImpl>& draw_properties() const {
 310     return draw_properties_;
 311   }
 312
 313   // The following are shortcut accessors to get various information from
 314   // draw_properties_
 315   const gfx::Transform& draw_transform() const {
 316     return draw_properties_.target_space_transform;
 317   }
 318   const gfx::Transform& screen_space_transform() const {
 319     return draw_properties_.screen_space_transform;
 320   }
 321   float draw_opacity() const { return draw_properties_.opacity; }
 322   bool draw_opacity_is_animating() const {
 323     return draw_properties_.opacity_is_animating;
 324   }
 325   bool draw_transform_is_animating() const {
 326     return draw_properties_.target_space_transform_is_animating;
 327   }
 328   bool screen_space_transform_is_animating() const {
 329     return draw_properties_.screen_space_transform_is_animating;
 330   }
 331   bool screen_space_opacity_is_animating() const {
 332     return draw_properties_.screen_space_opacity_is_animating;
 333   }
 334   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 335   bool is_clipped() const { return draw_properties_.is_clipped; }
 336   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 337   gfx::Rect drawable_content_rect() const {
 338     return draw_properties_.drawable_content_rect;
 339   }
 340   gfx::Rect visible_content_rect() const {
 341     return draw_properties_.visible_content_rect;
 342   }
 343   LayerImpl* render_target() {
 344     DCHECK(!draw_properties_.render_target ||
 345            draw_properties_.render_target->render_surface());
 346     return draw_properties_.render_target;
 347   }
 348   const LayerImpl* render_target() const {
 349     DCHECK(!draw_properties_.render_target ||
 350            draw_properties_.render_target->render_surface());
 351     return draw_properties_.render_target;
 352   }
 353   RenderSurfaceImpl* render_surface() const {
 354     return draw_properties_.render_surface.get();
 355   }
 356   int num_unclipped_descendants() const {
 357     return draw_properties_.num_unclipped_descendants;
 358   }
 359
 360   // The client should be responsible for setting bounds, content bounds and
 361   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 362   // them from the other values.
 363
 364   void SetBounds(const gfx::Size& bounds);
 365   gfx::Size bounds() const;
 366   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
 367   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 368
 369   void SetContentBounds(const gfx::Size& content_bounds);
 370   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 371
 372   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 373   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 374   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 375
 376   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
 377   bool IsExternalFlingActive() const;
 378
 379   void SetScrollOffset(const gfx::Vector2d& scroll_offset);
 380   void SetScrollOffsetAndDelta(const gfx::Vector2d& scroll_offset,
 381                                const gfx::Vector2dF& scroll_delta);
 382   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
 383
 384   gfx::Vector2d MaxScrollOffset() const;
 385   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 386   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 387                             LayerImpl* scrollbar_clip_layer) const;
 388   void SetScrollDelta(const gfx::Vector2dF& scroll_delta);
 389   gfx::Vector2dF ScrollDelta() const;
 390
 391   gfx::Vector2dF TotalScrollOffset() const;
 392
 393   void SetSentScrollDelta(const gfx::Vector2d& sent_scroll_delta);
 394   gfx::Vector2d sent_scroll_delta() const { return sent_scroll_delta_; }
 395
 396   // Returns the delta of the scroll that was outside of the bounds of the
 397   // initial scroll
 398   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 399
 400   void SetScrollClipLayer(int scroll_clip_layer_id);
 401   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 402   bool scrollable() const { return !!scroll_clip_layer_; }
 403
 404   void set_user_scrollable_horizontal(bool scrollable) {
 405     user_scrollable_horizontal_ = scrollable;
 406   }
 407   void set_user_scrollable_vertical(bool scrollable) {
 408     user_scrollable_vertical_ = scrollable;
 409   }
 410
 411   void ApplySentScrollDeltasFromAbortedCommit();
 412   void ApplyScrollDeltasSinceBeginMainFrame();
 413
 414   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 415     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 416   }
 417   bool should_scroll_on_main_thread() const {
 418     return should_scroll_on_main_thread_;
 419   }
 420
 421   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 422     have_wheel_event_handlers_ = have_wheel_event_handlers;
 423   }
 424   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 425
 426   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 427     have_scroll_event_handlers_ = have_scroll_event_handlers;
 428   }
 429   bool have_scroll_event_handlers() const {
 430     return have_scroll_event_handlers_;
 431   }
 432
 433   void SetNonFastScrollableRegion(const Region& region) {
 434     non_fast_scrollable_region_ = region;
 435   }
 436   const Region& non_fast_scrollable_region() const {
 437     return non_fast_scrollable_region_;
 438   }
 439
 440   void SetTouchEventHandlerRegion(const Region& region) {
 441     touch_event_handler_region_ = region;
 442   }
 443   const Region& touch_event_handler_region() const {
 444     return touch_event_handler_region_;
 445   }
 446
 447   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 448     draw_checkerboard_for_missing_tiles_ = checkerboard;
 449   }
 450   bool draw_checkerboard_for_missing_tiles() const {
 451     return draw_checkerboard_for_missing_tiles_;
 452   }
 453
 454   InputHandler::ScrollStatus TryScroll(
 455       const gfx::PointF& screen_space_point,
 456       InputHandler::ScrollInputType type) const;
 457
 458   void SetDoubleSided(bool double_sided);
 459   bool double_sided() const { return double_sided_; }
 460
 461   void SetTransform(const gfx::Transform& transform);
 462   const gfx::Transform& transform() const { return transform_; }
 463   bool TransformIsAnimating() const;
 464   bool TransformIsAnimatingOnImplOnly() const;
 465   void SetTransformAndInvertibility(const gfx::Transform& transform,
 466                                     bool transform_is_invertible);
 467   bool transform_is_invertible() const { return transform_is_invertible_; }
 468
 469   // Note this rect is in layer space (not content space).
 470   void SetUpdateRect(const gfx::RectF& update_rect);
 471
 472   const gfx::RectF& update_rect() const { return update_rect_; }
 473
 474   void AddDamageRect(const gfx::RectF& damage_rect);
 475
 476   const gfx::RectF& damage_rect() const { return damage_rect_; }
 477
 478   virtual base::DictionaryValue* LayerTreeAsJson() const;
 479
 480   void SetStackingOrderChanged(bool stacking_order_changed);
 481
 482   bool LayerPropertyChanged() const { return layer_property_changed_; }
 483
 484   void ResetAllChangeTrackingForSubtree();
 485
 486   LayerAnimationController* layer_animation_controller() {
 487     return layer_animation_controller_.get();
 488   }
 489
 490   const LayerAnimationController* layer_animation_controller() const {
 491     return layer_animation_controller_.get();
 492   }
 493
 494   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
 495
 496   virtual void DidBecomeActive();
 497
 498   virtual void DidBeginTracing();
 499
 500   // Release resources held by this layer. Called when the output surface
 501   // that rendered this layer was lost or a rendering mode switch has occured.
 502   virtual void ReleaseResources();
 503
 504   ScrollbarAnimationController* scrollbar_animation_controller() const {
 505     return scrollbar_animation_controller_.get();
 506   }
 507
 508   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 509   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 510   void ClearScrollbars();
 511   void AddScrollbar(ScrollbarLayerImplBase* layer);
 512   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 513   bool HasScrollbar(ScrollbarOrientation orientation) const;
 514   void ScrollbarParametersDidChange();
 515   int clip_height() {
 516     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 517   }
 518
 519   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 520
 521   virtual skia::RefPtr<SkPicture> GetPicture();
 522
 523   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 524   virtual void PushPropertiesTo(LayerImpl* layer);
 525
 526   virtual void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
 527   virtual void AsValueInto(base::debug::TracedValue* dict) const;
 528
 529   virtual size_t GPUMemoryUsageInBytes() const;
 530
 531   void SetNeedsPushProperties();
 532   void AddDependentNeedsPushProperties();
 533   void RemoveDependentNeedsPushProperties();
 534   bool parent_should_know_need_push_properties() const {
 535     return needs_push_properties() || descendant_needs_push_properties();
 536   }
 537
 538   bool needs_push_properties() const { return needs_push_properties_; }
 539   bool descendant_needs_push_properties() const {
 540     return num_dependents_need_push_properties_ > 0;
 541   }
 542
 543   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 544
 545   virtual void SetDebugInfo(
 546       scoped_refptr<base::debug::ConvertableToTraceFormat> other);
 547
 548   bool IsDrawnRenderSurfaceLayerListMember() const;
 549
 550   void Set3dSortingContextId(int id);
 551   int sorting_context_id() { return sorting_context_id_; }
 552
 553  protected:
 554   LayerImpl(LayerTreeImpl* layer_impl, int id);
 555
 556   // Get the color and size of the layer's debug border.
 557   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 558
 559   void AppendDebugBorderQuad(RenderPass* render_pass,
 560                              const gfx::Size& content_bounds,
 561                              const SharedQuadState* shared_quad_state,
 562                              AppendQuadsData* append_quads_data) const;
 563   void AppendDebugBorderQuad(RenderPass* render_pass,
 564                              const gfx::Size& content_bounds,
 565                              const SharedQuadState* shared_quad_state,
 566                              AppendQuadsData* append_quads_data,
 567                              SkColor color,
 568                              float width) const;
 569
 570   void NoteLayerPropertyChanged();
 571   void NoteLayerPropertyChangedForSubtree();
 572
 573   // Note carefully this does not affect the current layer.
 574   void NoteLayerPropertyChangedForDescendants();
 575
 576  private:
 577   void NoteLayerPropertyChangedForDescendantsInternal();
 578
 579   virtual const char* LayerTypeAsString() const;
 580
 581   // Properties internal to LayerImpl
 582   LayerImpl* parent_;
 583   OwnedLayerImplList children_;
 584
 585   LayerImpl* scroll_parent_;
 586
 587   // Storing a pointer to a set rather than a set since this will be rarely
 588   // used. If this pointer turns out to be too heavy, we could have this (and
 589   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 590   // map somewhere.
 591   scoped_ptr<std::set<LayerImpl*> > scroll_children_;
 592
 593   LayerImpl* clip_parent_;
 594   scoped_ptr<std::set<LayerImpl*> > clip_children_;
 595
 596   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 597   // confirm newly assigned layer is still the previous one
 598   int mask_layer_id_;
 599   scoped_ptr<LayerImpl> mask_layer_;
 600   int replica_layer_id_;  // ditto
 601   scoped_ptr<LayerImpl> replica_layer_;
 602   int layer_id_;
 603   LayerTreeImpl* layer_tree_impl_;
 604
 605   // Properties synchronized from the associated Layer.
 606   gfx::Point3F transform_origin_;
 607   gfx::Size bounds_;
 608   gfx::Vector2dF bounds_delta_;
 609   gfx::Vector2d scroll_offset_;
 610   ScrollOffsetDelegate* scroll_offset_delegate_;
 611   LayerImpl* scroll_clip_layer_;
 612   bool scrollable_ : 1;
 613   bool should_scroll_on_main_thread_ : 1;
 614   bool have_wheel_event_handlers_ : 1;
 615   bool have_scroll_event_handlers_ : 1;
 616   bool user_scrollable_horizontal_ : 1;
 617   bool user_scrollable_vertical_ : 1;
 618   bool stacking_order_changed_ : 1;
 619   // Whether the "back" of this layer should draw.
 620   bool double_sided_ : 1;
 621   bool should_flatten_transform_ : 1;
 622
 623   // Tracks if drawing-related properties have changed since last redraw.
 624   bool layer_property_changed_ : 1;
 625
 626   bool masks_to_bounds_ : 1;
 627   bool contents_opaque_ : 1;
 628   bool is_root_for_isolated_group_ : 1;
 629   bool use_parent_backface_visibility_ : 1;
 630   bool draw_checkerboard_for_missing_tiles_ : 1;
 631   bool draws_content_ : 1;
 632   bool hide_layer_and_subtree_ : 1;
 633   bool force_render_surface_ : 1;
 634
 635   // Cache transform_'s invertibility.
 636   bool transform_is_invertible_ : 1;
 637
 638   // Set for the layer that other layers are fixed to.
 639   bool is_container_for_fixed_position_layers_ : 1;
 640   Region non_fast_scrollable_region_;
 641   Region touch_event_handler_region_;
 642   SkColor background_color_;
 643
 644   float opacity_;
 645   SkXfermode::Mode blend_mode_;
 646   gfx::PointF position_;
 647   gfx::Transform transform_;
 648
 649   LayerPositionConstraint position_constraint_;
 650
 651   gfx::Vector2dF scroll_delta_;
 652   gfx::Vector2d sent_scroll_delta_;
 653   gfx::Vector2dF last_scroll_offset_;
 654
 655   int num_descendants_that_draw_content_;
 656
 657   // The global depth value of the center of the layer. This value is used
 658   // to sort layers from back to front.
 659   float draw_depth_;
 660
 661   FilterOperations filters_;
 662   FilterOperations background_filters_;
 663
 664  protected:
 665   friend class TreeSynchronizer;
 666
 667   // This flag is set when the layer needs to push properties to the active
 668   // side.
 669   bool needs_push_properties_;
 670
 671   // The number of direct children or dependent layers that need to be recursed
 672   // to in order for them or a descendent of them to push properties to the
 673   // active side.
 674   int num_dependents_need_push_properties_;
 675
 676   // Layers that share a sorting context id will be sorted together in 3d
 677   // space.  0 is a special value that means this layer will not be sorted and
 678   // will be drawn in paint order.
 679   int sorting_context_id_;
 680
 681   DrawMode current_draw_mode_;
 682
 683  private:
 684   // Rect indicating what was repainted/updated during update.
 685   // Note that plugin layers bypass this and leave it empty.
 686   // Uses layer (not content) space.
 687   gfx::RectF update_rect_;
 688
 689   // This rect is in layer space.
 690   gfx::RectF damage_rect_;
 691
 692   // Manages animations for this layer.
 693   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 694
 695   // Manages scrollbars for this layer
 696   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 697
 698   scoped_ptr<ScrollbarSet> scrollbars_;
 699
 700   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 701
 702   // Group of properties that need to be computed based on the layer tree
 703   // hierarchy before layers can be drawn.
 704   DrawProperties<LayerImpl> draw_properties_;
 705
 706   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 707
 708   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 709 };
 710
 711 }  // namespace cc
 712
 713 #endif  // CC_LAYERS_LAYER_IMPL_H_