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   virtual void UpdateTiles(const Occlusion& occlusion_in_layer_space,
 212                            bool resourceless_software_draw) {}
 213   virtual void NotifyTileStateChanged(const Tile* tile) {}
 214
 215   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 216
 217   // Returns true if this layer has content to draw.
 218   void SetDrawsContent(bool draws_content);
 219   bool DrawsContent() const { return draws_content_; }
 220
 221   int NumDescendantsThatDrawContent() const;
 222   void SetHideLayerAndSubtree(bool hide);
 223   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 224
 225   bool force_render_surface() const { return force_render_surface_; }
 226   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 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 CreateRenderSurface();
 307   void ClearRenderSurface();
 308   void ClearRenderSurfaceLayerList();
 309
 310   DrawProperties<LayerImpl>& draw_properties() {
 311     return draw_properties_;
 312   }
 313   const DrawProperties<LayerImpl>& draw_properties() const {
 314     return draw_properties_;
 315   }
 316
 317   // The following are shortcut accessors to get various information from
 318   // draw_properties_
 319   const gfx::Transform& draw_transform() const {
 320     return draw_properties_.target_space_transform;
 321   }
 322   const gfx::Transform& screen_space_transform() const {
 323     return draw_properties_.screen_space_transform;
 324   }
 325   float draw_opacity() const { return draw_properties_.opacity; }
 326   SkXfermode::Mode draw_blend_mode() const {
 327     return draw_properties_.blend_mode;
 328   }
 329   bool draw_opacity_is_animating() const {
 330     return draw_properties_.opacity_is_animating;
 331   }
 332   bool draw_transform_is_animating() const {
 333     return draw_properties_.target_space_transform_is_animating;
 334   }
 335   bool screen_space_transform_is_animating() const {
 336     return draw_properties_.screen_space_transform_is_animating;
 337   }
 338   bool screen_space_opacity_is_animating() const {
 339     return draw_properties_.screen_space_opacity_is_animating;
 340   }
 341   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 342   bool is_clipped() const { return draw_properties_.is_clipped; }
 343   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 344   gfx::Rect drawable_content_rect() const {
 345     return draw_properties_.drawable_content_rect;
 346   }
 347   gfx::Rect visible_content_rect() const {
 348     return draw_properties_.visible_content_rect;
 349   }
 350   LayerImpl* render_target() {
 351     DCHECK(!draw_properties_.render_target ||
 352            draw_properties_.render_target->render_surface());
 353     return draw_properties_.render_target;
 354   }
 355   const LayerImpl* render_target() const {
 356     DCHECK(!draw_properties_.render_target ||
 357            draw_properties_.render_target->render_surface());
 358     return draw_properties_.render_target;
 359   }
 360   RenderSurfaceImpl* render_surface() const {
 361     return draw_properties_.render_surface.get();
 362   }
 363   int num_unclipped_descendants() const {
 364     return draw_properties_.num_unclipped_descendants;
 365   }
 366
 367   // The client should be responsible for setting bounds, content bounds and
 368   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 369   // them from the other values.
 370
 371   void SetBounds(const gfx::Size& bounds);
 372   gfx::Size bounds() const;
 373   // Like bounds() but doesn't snap to int. Lossy on giant pages (e.g. millions
 374   // of pixels) due to use of single precision float.
 375   gfx::SizeF BoundsForScrolling() const;
 376   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
 377   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 378
 379   void SetContentBounds(const gfx::Size& content_bounds);
 380   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 381
 382   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 383   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 384   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 385
 386   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
 387   void DidScroll();
 388   bool IsExternalFlingActive() const;
 389
 390   void SetScrollOffset(const gfx::ScrollOffset& scroll_offset);
 391   void SetScrollOffsetAndDelta(const gfx::ScrollOffset& scroll_offset,
 392                                const gfx::Vector2dF& scroll_delta);
 393   gfx::ScrollOffset scroll_offset() const { return scroll_offset_; }
 394
 395   gfx::ScrollOffset MaxScrollOffset() const;
 396   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 397   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 398                             LayerImpl* scrollbar_clip_layer,
 399                             bool on_resize) const;
 400   void SetScrollDelta(const gfx::Vector2dF& scroll_delta);
 401   gfx::Vector2dF ScrollDelta() const;
 402
 403   gfx::ScrollOffset TotalScrollOffset() const;
 404
 405   void SetSentScrollDelta(const gfx::Vector2dF& sent_scroll_delta);
 406   gfx::Vector2dF sent_scroll_delta() const { return sent_scroll_delta_; }
 407
 408   // Returns the delta of the scroll that was outside of the bounds of the
 409   // initial scroll
 410   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 411
 412   void SetScrollClipLayer(int scroll_clip_layer_id);
 413   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 414   bool scrollable() const { return !!scroll_clip_layer_; }
 415
 416   void set_user_scrollable_horizontal(bool scrollable) {
 417     user_scrollable_horizontal_ = scrollable;
 418   }
 419   bool user_scrollable_horizontal() const {
 420     return user_scrollable_horizontal_;
 421   }
 422   void set_user_scrollable_vertical(bool scrollable) {
 423     user_scrollable_vertical_ = scrollable;
 424   }
 425   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 426
 427   bool user_scrollable(ScrollbarOrientation orientation) const;
 428
 429   void ApplySentScrollDeltasFromAbortedCommit();
 430   void ApplyScrollDeltasSinceBeginMainFrame();
 431
 432   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 433     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 434   }
 435   bool should_scroll_on_main_thread() const {
 436     return should_scroll_on_main_thread_;
 437   }
 438
 439   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 440     have_wheel_event_handlers_ = have_wheel_event_handlers;
 441   }
 442   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 443
 444   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 445     have_scroll_event_handlers_ = have_scroll_event_handlers;
 446   }
 447   bool have_scroll_event_handlers() const {
 448     return have_scroll_event_handlers_;
 449   }
 450
 451   void SetNonFastScrollableRegion(const Region& region) {
 452     non_fast_scrollable_region_ = region;
 453   }
 454   const Region& non_fast_scrollable_region() const {
 455     return non_fast_scrollable_region_;
 456   }
 457
 458   void SetTouchEventHandlerRegion(const Region& region) {
 459     touch_event_handler_region_ = region;
 460   }
 461   const Region& touch_event_handler_region() const {
 462     return touch_event_handler_region_;
 463   }
 464
 465   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 466     draw_checkerboard_for_missing_tiles_ = checkerboard;
 467   }
 468   bool draw_checkerboard_for_missing_tiles() const {
 469     return draw_checkerboard_for_missing_tiles_;
 470   }
 471
 472   InputHandler::ScrollStatus TryScroll(
 473       const gfx::PointF& screen_space_point,
 474       InputHandler::ScrollInputType type) const;
 475
 476   void SetDoubleSided(bool double_sided);
 477   bool double_sided() const { return double_sided_; }
 478
 479   void SetTransform(const gfx::Transform& transform);
 480   const gfx::Transform& transform() const { return transform_; }
 481   bool TransformIsAnimating() const;
 482   bool TransformIsAnimatingOnImplOnly() const;
 483   void SetTransformAndInvertibility(const gfx::Transform& transform,
 484                                     bool transform_is_invertible);
 485   bool transform_is_invertible() const { return transform_is_invertible_; }
 486
 487   // Note this rect is in layer space (not content space).
 488   void SetUpdateRect(const gfx::Rect& update_rect);
 489   gfx::Rect update_rect() const { return update_rect_; }
 490
 491   void AddDamageRect(const gfx::RectF& damage_rect);
 492
 493   const gfx::RectF& damage_rect() const { return damage_rect_; }
 494
 495   virtual base::DictionaryValue* LayerTreeAsJson() const;
 496
 497   void SetStackingOrderChanged(bool stacking_order_changed);
 498
 499   bool LayerPropertyChanged() const { return layer_property_changed_; }
 500
 501   void ResetAllChangeTrackingForSubtree();
 502
 503   LayerAnimationController* layer_animation_controller() {
 504     return layer_animation_controller_.get();
 505   }
 506
 507   const LayerAnimationController* layer_animation_controller() const {
 508     return layer_animation_controller_.get();
 509   }
 510
 511   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
 512
 513   virtual void DidBecomeActive();
 514
 515   virtual void DidBeginTracing();
 516
 517   // Release resources held by this layer. Called when the output surface
 518   // that rendered this layer was lost or a rendering mode switch has occured.
 519   virtual void ReleaseResources();
 520
 521   ScrollbarAnimationController* scrollbar_animation_controller() const {
 522     return scrollbar_animation_controller_.get();
 523   }
 524
 525   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 526   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 527   void ClearScrollbars();
 528   void AddScrollbar(ScrollbarLayerImplBase* layer);
 529   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 530   bool HasScrollbar(ScrollbarOrientation orientation) const;
 531   void ScrollbarParametersDidChange(bool on_resize);
 532   int clip_height() {
 533     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 534   }
 535
 536   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 537
 538   virtual skia::RefPtr<SkPicture> GetPicture();
 539
 540   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 541   virtual void PushPropertiesTo(LayerImpl* layer);
 542
 543   virtual void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
 544   virtual void AsValueInto(base::debug::TracedValue* dict) const;
 545
 546   virtual size_t GPUMemoryUsageInBytes() const;
 547
 548   void SetNeedsPushProperties();
 549   void AddDependentNeedsPushProperties();
 550   void RemoveDependentNeedsPushProperties();
 551   bool parent_should_know_need_push_properties() const {
 552     return needs_push_properties() || descendant_needs_push_properties();
 553   }
 554
 555   bool needs_push_properties() const { return needs_push_properties_; }
 556   bool descendant_needs_push_properties() const {
 557     return num_dependents_need_push_properties_ > 0;
 558   }
 559
 560   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 561
 562   virtual void SetDebugInfo(
 563       scoped_refptr<base::debug::ConvertableToTraceFormat> other);
 564
 565   bool IsDrawnRenderSurfaceLayerListMember() const;
 566
 567   void Set3dSortingContextId(int id);
 568   int sorting_context_id() { return sorting_context_id_; }
 569
 570  protected:
 571   LayerImpl(LayerTreeImpl* layer_impl, int id);
 572
 573   // Get the color and size of the layer's debug border.
 574   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 575
 576   void AppendDebugBorderQuad(RenderPass* render_pass,
 577                              const gfx::Size& content_bounds,
 578                              const SharedQuadState* shared_quad_state,
 579                              AppendQuadsData* append_quads_data) const;
 580   void AppendDebugBorderQuad(RenderPass* render_pass,
 581                              const gfx::Size& content_bounds,
 582                              const SharedQuadState* shared_quad_state,
 583                              AppendQuadsData* append_quads_data,
 584                              SkColor color,
 585                              float width) const;
 586
 587   void NoteLayerPropertyChanged();
 588   void NoteLayerPropertyChangedForSubtree();
 589
 590   // Note carefully this does not affect the current layer.
 591   void NoteLayerPropertyChangedForDescendants();
 592
 593  private:
 594   void NoteLayerPropertyChangedForDescendantsInternal();
 595
 596   virtual const char* LayerTypeAsString() const;
 597
 598   // Properties internal to LayerImpl
 599   LayerImpl* parent_;
 600   OwnedLayerImplList children_;
 601
 602   LayerImpl* scroll_parent_;
 603
 604   // Storing a pointer to a set rather than a set since this will be rarely
 605   // used. If this pointer turns out to be too heavy, we could have this (and
 606   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 607   // map somewhere.
 608   scoped_ptr<std::set<LayerImpl*>> scroll_children_;
 609
 610   LayerImpl* clip_parent_;
 611   scoped_ptr<std::set<LayerImpl*>> clip_children_;
 612
 613   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 614   // confirm newly assigned layer is still the previous one
 615   int mask_layer_id_;
 616   scoped_ptr<LayerImpl> mask_layer_;
 617   int replica_layer_id_;  // ditto
 618   scoped_ptr<LayerImpl> replica_layer_;
 619   int layer_id_;
 620   LayerTreeImpl* layer_tree_impl_;
 621
 622   // Properties synchronized from the associated Layer.
 623   gfx::Point3F transform_origin_;
 624   gfx::Size bounds_;
 625   gfx::Vector2dF bounds_delta_;
 626   gfx::ScrollOffset scroll_offset_;
 627   ScrollOffsetDelegate* scroll_offset_delegate_;
 628   LayerImpl* scroll_clip_layer_;
 629   bool scrollable_ : 1;
 630   bool should_scroll_on_main_thread_ : 1;
 631   bool have_wheel_event_handlers_ : 1;
 632   bool have_scroll_event_handlers_ : 1;
 633   bool user_scrollable_horizontal_ : 1;
 634   bool user_scrollable_vertical_ : 1;
 635   bool stacking_order_changed_ : 1;
 636   // Whether the "back" of this layer should draw.
 637   bool double_sided_ : 1;
 638   bool should_flatten_transform_ : 1;
 639
 640   // Tracks if drawing-related properties have changed since last redraw.
 641   bool layer_property_changed_ : 1;
 642
 643   bool masks_to_bounds_ : 1;
 644   bool contents_opaque_ : 1;
 645   bool is_root_for_isolated_group_ : 1;
 646   bool use_parent_backface_visibility_ : 1;
 647   bool draw_checkerboard_for_missing_tiles_ : 1;
 648   bool draws_content_ : 1;
 649   bool hide_layer_and_subtree_ : 1;
 650   bool force_render_surface_ : 1;
 651
 652   // Cache transform_'s invertibility.
 653   bool transform_is_invertible_ : 1;
 654
 655   // Set for the layer that other layers are fixed to.
 656   bool is_container_for_fixed_position_layers_ : 1;
 657   Region non_fast_scrollable_region_;
 658   Region touch_event_handler_region_;
 659   SkColor background_color_;
 660
 661   float opacity_;
 662   SkXfermode::Mode blend_mode_;
 663   gfx::PointF position_;
 664   gfx::Transform transform_;
 665
 666   LayerPositionConstraint position_constraint_;
 667
 668   gfx::Vector2dF scroll_delta_;
 669   gfx::Vector2dF sent_scroll_delta_;
 670   gfx::ScrollOffset last_scroll_offset_;
 671
 672   int num_descendants_that_draw_content_;
 673
 674   // The global depth value of the center of the layer. This value is used
 675   // to sort layers from back to front.
 676   float draw_depth_;
 677
 678   FilterOperations filters_;
 679   FilterOperations background_filters_;
 680
 681  protected:
 682   friend class TreeSynchronizer;
 683
 684   // This flag is set when the layer needs to push properties to the active
 685   // side.
 686   bool needs_push_properties_;
 687
 688   // The number of direct children or dependent layers that need to be recursed
 689   // to in order for them or a descendent of them to push properties to the
 690   // active side.
 691   int num_dependents_need_push_properties_;
 692
 693   // Layers that share a sorting context id will be sorted together in 3d
 694   // space.  0 is a special value that means this layer will not be sorted and
 695   // will be drawn in paint order.
 696   int sorting_context_id_;
 697
 698   DrawMode current_draw_mode_;
 699
 700  private:
 701   // Rect indicating what was repainted/updated during update.
 702   // Note that plugin layers bypass this and leave it empty.
 703   // Uses layer (not content) space.
 704   gfx::Rect update_rect_;
 705
 706   // This rect is in layer space.
 707   gfx::RectF damage_rect_;
 708
 709   // Manages animations for this layer.
 710   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 711
 712   // Manages scrollbars for this layer
 713   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 714
 715   scoped_ptr<ScrollbarSet> scrollbars_;
 716
 717   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 718
 719   // Group of properties that need to be computed based on the layer tree
 720   // hierarchy before layers can be drawn.
 721   DrawProperties<LayerImpl> draw_properties_;
 722
 723   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 724
 725   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 726 };
 727
 728 }  // namespace cc
 729
 730 #endif  // CC_LAYERS_LAYER_IMPL_H_