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 #include <vector>
  11
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/values.h"
  15 #include "cc/animation/animation_delegate.h"
  16 #include "cc/animation/layer_animation_controller.h"
  17 #include "cc/animation/layer_animation_value_observer.h"
  18 #include "cc/animation/layer_animation_value_provider.h"
  19 #include "cc/base/cc_export.h"
  20 #include "cc/base/region.h"
  21 #include "cc/base/scoped_ptr_vector.h"
  22 #include "cc/base/synced_property.h"
  23 #include "cc/debug/frame_timing_request.h"
  24 #include "cc/input/input_handler.h"
  25 #include "cc/input/scrollbar.h"
  26 #include "cc/layers/draw_properties.h"
  27 #include "cc/layers/layer_lists.h"
  28 #include "cc/layers/layer_position_constraint.h"
  29 #include "cc/layers/render_surface_impl.h"
  30 #include "cc/layers/scroll_blocks_on.h"
  31 #include "cc/output/filter_operations.h"
  32 #include "cc/quads/shared_quad_state.h"
  33 #include "cc/resources/resource_provider.h"
  34 #include "skia/ext/refptr.h"
  35 #include "third_party/skia/include/core/SkColor.h"
  36 #include "third_party/skia/include/core/SkImageFilter.h"
  37 #include "third_party/skia/include/core/SkPicture.h"
  38 #include "ui/gfx/geometry/point3_f.h"
  39 #include "ui/gfx/geometry/rect.h"
  40 #include "ui/gfx/geometry/rect_f.h"
  41 #include "ui/gfx/geometry/scroll_offset.h"
  42 #include "ui/gfx/transform.h"
  43
  44 namespace base {
  45 namespace trace_event {
  46 class ConvertableToTraceFormat;
  47 class TracedValue;
  48 }
  49 class DictionaryValue;
  50 }
  51
  52 namespace cc {
  53
  54 class LayerTreeHostImpl;
  55 class LayerTreeImpl;
  56 class MicroBenchmarkImpl;
  57 class Occlusion;
  58 template <typename LayerType>
  59 class OcclusionTracker;
  60 class RenderPass;
  61 class RenderPassId;
  62 class Renderer;
  63 class ScrollbarAnimationController;
  64 class ScrollbarLayerImplBase;
  65 class SimpleEnclosedRegion;
  66 class Tile;
  67
  68 struct AppendQuadsData;
  69
  70 enum DrawMode {
  71   DRAW_MODE_NONE,
  72   DRAW_MODE_HARDWARE,
  73   DRAW_MODE_SOFTWARE,
  74   DRAW_MODE_RESOURCELESS_SOFTWARE
  75 };
  76
  77 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
  78                             public LayerAnimationValueProvider,
  79                             public AnimationDelegate {
  80  public:
  81   // Allows for the ownership of the total scroll offset to be delegated outside
  82   // of the layer.
  83   class ScrollOffsetDelegate {
  84    public:
  85     virtual void SetCurrentScrollOffset(const gfx::ScrollOffset& new_value) = 0;
  86     virtual gfx::ScrollOffset GetCurrentScrollOffset() = 0;
  87     virtual bool IsExternalFlingActive() const = 0;
  88     virtual void Update() const = 0;
  89   };
  90
  91   typedef SyncedProperty<AdditionGroup<gfx::ScrollOffset>> SyncedScrollOffset;
  92   typedef LayerImplList RenderSurfaceListType;
  93   typedef LayerImplList LayerListType;
  94   typedef RenderSurfaceImpl RenderSurfaceType;
  95
  96   enum RenderingContextConstants { NO_RENDERING_CONTEXT = 0 };
  97
  98   static scoped_ptr<LayerImpl> Create(
  99       LayerTreeImpl* tree_impl,
 100       int id,
 101       scoped_refptr<SyncedScrollOffset> scroll_offset) {
 102     return make_scoped_ptr(new LayerImpl(tree_impl, id, scroll_offset));
 103   }
 104
 105   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
 106     return make_scoped_ptr(new LayerImpl(tree_impl, id));
 107   }
 108
 109   ~LayerImpl() override;
 110
 111   int id() const { return layer_id_; }
 112
 113   // LayerAnimationValueProvider implementation.
 114   gfx::ScrollOffset ScrollOffsetForAnimation() const override;
 115
 116   // LayerAnimationValueObserver implementation.
 117   void OnFilterAnimated(const FilterOperations& filters) override;
 118   void OnOpacityAnimated(float opacity) override;
 119   void OnTransformAnimated(const gfx::Transform& transform) override;
 120   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
 121   void OnAnimationWaitingForDeletion() override;
 122   bool IsActive() const override;
 123
 124   // AnimationDelegate implementation.
 125   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
 126                               Animation::TargetProperty target_property,
 127                               int group) override{};
 128   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
 129                                Animation::TargetProperty target_property,
 130                                int group) override;
 131
 132   // Tree structure.
 133   LayerImpl* parent() { return parent_; }
 134   const LayerImpl* parent() const { return parent_; }
 135   const OwnedLayerImplList& children() const { return children_; }
 136   OwnedLayerImplList& children() { return children_; }
 137   LayerImpl* child_at(size_t index) const { return children_[index]; }
 138   void AddChild(scoped_ptr<LayerImpl> child);
 139   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
 140   void SetParent(LayerImpl* parent);
 141
 142   // Warning: This does not preserve tree structure invariants.
 143   void ClearChildList();
 144
 145   bool HasAncestor(const LayerImpl* ancestor) const;
 146
 147   void SetScrollParent(LayerImpl* parent);
 148
 149   LayerImpl* scroll_parent() { return scroll_parent_; }
 150   const LayerImpl* scroll_parent() const { return scroll_parent_; }
 151
 152   void SetScrollChildren(std::set<LayerImpl*>* children);
 153
 154   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 155   const std::set<LayerImpl*>* scroll_children() const {
 156     return scroll_children_.get();
 157   }
 158
 159   void SetNumDescendantsThatDrawContent(int num_descendants);
 160   void SetClipParent(LayerImpl* ancestor);
 161
 162   LayerImpl* clip_parent() {
 163     return clip_parent_;
 164   }
 165   const LayerImpl* clip_parent() const {
 166     return clip_parent_;
 167   }
 168
 169   void SetClipChildren(std::set<LayerImpl*>* children);
 170
 171   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 172   const std::set<LayerImpl*>* clip_children() const {
 173     return clip_children_.get();
 174   }
 175
 176   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 177   // Can only be called when the layer has a copy request.
 178   void TakeCopyRequestsAndTransformToTarget(
 179       ScopedPtrVector<CopyOutputRequest>* request);
 180   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 181
 182   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 183   LayerImpl* mask_layer() { return mask_layer_.get(); }
 184   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 185   scoped_ptr<LayerImpl> TakeMaskLayer();
 186
 187   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 188   LayerImpl* replica_layer() { return replica_layer_.get(); }
 189   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 190   scoped_ptr<LayerImpl> TakeReplicaLayer();
 191
 192   bool has_mask() const { return mask_layer_; }
 193   bool has_replica() const { return replica_layer_; }
 194   bool replica_has_mask() const {
 195     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 196   }
 197
 198   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 199
 200   void PopulateSharedQuadState(SharedQuadState* state) const;
 201   void PopulateScaledSharedQuadState(SharedQuadState* state, float scale) const;
 202   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 203   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 204   // DidDraw is guaranteed to be called before another WillDraw or before
 205   // the layer is destroyed. To enforce this, any class that overrides
 206   // WillDraw/DidDraw must call the base class version only if WillDraw
 207   // returns true.
 208   virtual bool WillDraw(DrawMode draw_mode,
 209                         ResourceProvider* resource_provider);
 210   virtual void AppendQuads(RenderPass* render_pass,
 211                            AppendQuadsData* append_quads_data) {}
 212   virtual void DidDraw(ResourceProvider* resource_provider);
 213
 214   virtual void GetContentsResourceId(ResourceProvider::ResourceId* resource_id,
 215                                      gfx::Size* resource_size) const;
 216
 217   virtual bool HasDelegatedContent() const;
 218   virtual bool HasContributingDelegatedRenderPasses() const;
 219   virtual RenderPassId FirstContributingRenderPassId() const;
 220   virtual RenderPassId NextContributingRenderPassId(RenderPassId id) const;
 221
 222   virtual void NotifyTileStateChanged(const Tile* tile) {}
 223
 224   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 225
 226   // Returns true if this layer has content to draw.
 227   void SetDrawsContent(bool draws_content);
 228   bool DrawsContent() const { return draws_content_; }
 229
 230   int NumDescendantsThatDrawContent() const;
 231   void SetHideLayerAndSubtree(bool hide);
 232   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 233
 234   void SetTransformOrigin(const gfx::Point3F& transform_origin);
 235   gfx::Point3F transform_origin() const { return transform_origin_; }
 236
 237   void SetBackgroundColor(SkColor background_color);
 238   SkColor background_color() const { return background_color_; }
 239   // If contents_opaque(), return an opaque color else return a
 240   // non-opaque color.  Tries to return background_color(), if possible.
 241   SkColor SafeOpaqueBackgroundColor() const;
 242
 243   void SetFilters(const FilterOperations& filters);
 244   const FilterOperations& filters() const { return filters_; }
 245   bool FilterIsAnimating() const;
 246   bool FilterIsAnimatingOnImplOnly() const;
 247
 248   void SetBackgroundFilters(const FilterOperations& filters);
 249   const FilterOperations& background_filters() const {
 250     return background_filters_;
 251   }
 252
 253   void SetMasksToBounds(bool masks_to_bounds);
 254   bool masks_to_bounds() const { return masks_to_bounds_; }
 255
 256   void SetContentsOpaque(bool opaque);
 257   bool contents_opaque() const { return contents_opaque_; }
 258
 259   void SetOpacity(float opacity);
 260   float opacity() const { return opacity_; }
 261   bool OpacityIsAnimating() const;
 262   bool OpacityIsAnimatingOnImplOnly() const;
 263
 264   void SetBlendMode(SkXfermode::Mode);
 265   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 266   bool uses_default_blend_mode() const {
 267     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 268   }
 269
 270   void SetIsRootForIsolatedGroup(bool root);
 271   bool is_root_for_isolated_group() const {
 272     return is_root_for_isolated_group_;
 273   }
 274
 275   void SetPosition(const gfx::PointF& position);
 276   gfx::PointF position() const { return position_; }
 277
 278   void SetIsContainerForFixedPositionLayers(bool container) {
 279     is_container_for_fixed_position_layers_ = container;
 280   }
 281   // This is a non-trivial function in Layer.
 282   bool IsContainerForFixedPositionLayers() const {
 283     return is_container_for_fixed_position_layers_;
 284   }
 285
 286   gfx::Vector2dF FixedContainerSizeDelta() const;
 287
 288   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 289     position_constraint_ = constraint;
 290   }
 291   const LayerPositionConstraint& position_constraint() const {
 292     return position_constraint_;
 293   }
 294
 295   void SetShouldFlattenTransform(bool flatten);
 296   bool should_flatten_transform() const { return should_flatten_transform_; }
 297
 298   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 299
 300   void SetUseParentBackfaceVisibility(bool use) {
 301     use_parent_backface_visibility_ = use;
 302   }
 303   bool use_parent_backface_visibility() const {
 304     return use_parent_backface_visibility_;
 305   }
 306
 307   bool ShowDebugBorders() const;
 308
 309   // These invalidate the host's render surface layer list.  The caller
 310   // is responsible for calling set_needs_update_draw_properties on the tree
 311   // so that its list can be recreated.
 312   void ClearRenderSurfaceLayerList();
 313   void SetHasRenderSurface(bool has_render_surface);
 314
 315   RenderSurfaceImpl* render_surface() const { return render_surface_.get(); }
 316
 317   DrawProperties<LayerImpl>& draw_properties() {
 318     return draw_properties_;
 319   }
 320   const DrawProperties<LayerImpl>& draw_properties() const {
 321     return draw_properties_;
 322   }
 323
 324   // The following are shortcut accessors to get various information from
 325   // draw_properties_
 326   const gfx::Transform& draw_transform() const {
 327     return draw_properties_.target_space_transform;
 328   }
 329   const gfx::Transform& screen_space_transform() const {
 330     return draw_properties_.screen_space_transform;
 331   }
 332   float draw_opacity() const { return draw_properties_.opacity; }
 333   SkXfermode::Mode draw_blend_mode() const {
 334     return draw_properties_.blend_mode;
 335   }
 336   bool draw_opacity_is_animating() const {
 337     return draw_properties_.opacity_is_animating;
 338   }
 339   bool draw_transform_is_animating() const {
 340     return draw_properties_.target_space_transform_is_animating;
 341   }
 342   bool screen_space_transform_is_animating() const {
 343     return draw_properties_.screen_space_transform_is_animating;
 344   }
 345   bool screen_space_opacity_is_animating() const {
 346     return draw_properties_.screen_space_opacity_is_animating;
 347   }
 348   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 349   bool is_clipped() const { return draw_properties_.is_clipped; }
 350   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 351   gfx::Rect drawable_content_rect() const {
 352     return draw_properties_.drawable_content_rect;
 353   }
 354   gfx::Rect visible_content_rect() const {
 355     return draw_properties_.visible_content_rect;
 356   }
 357   LayerImpl* render_target() {
 358     DCHECK(!draw_properties_.render_target ||
 359            draw_properties_.render_target->render_surface());
 360     return draw_properties_.render_target;
 361   }
 362   const LayerImpl* render_target() const {
 363     DCHECK(!draw_properties_.render_target ||
 364            draw_properties_.render_target->render_surface());
 365     return draw_properties_.render_target;
 366   }
 367
 368   int num_unclipped_descendants() const {
 369     return draw_properties_.num_unclipped_descendants;
 370   }
 371
 372   // The client should be responsible for setting bounds, content bounds and
 373   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 374   // them from the other values.
 375
 376   void SetBounds(const gfx::Size& bounds);
 377   gfx::Size bounds() const;
 378   // Like bounds() but doesn't snap to int. Lossy on giant pages (e.g. millions
 379   // of pixels) due to use of single precision float.
 380   gfx::SizeF BoundsForScrolling() const;
 381   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
 382   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 383
 384   void SetContentBounds(const gfx::Size& content_bounds);
 385   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
 386
 387   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
 388   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
 389   void SetContentsScale(float contents_scale_x, float contents_scale_y);
 390
 391   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
 392   void RefreshFromScrollDelegate();
 393   bool IsExternalFlingActive() const;
 394
 395   void SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset);
 396   void PushScrollOffsetFromMainThread(const gfx::ScrollOffset& scroll_offset);
 397   // This method is similar to PushScrollOffsetFromMainThread but will cause the
 398   // scroll offset given to clobber any scroll changes on the active tree in the
 399   // time until this value is pushed to the active tree.
 400   void PushScrollOffsetFromMainThreadAndClobberActiveValue(
 401       const gfx::ScrollOffset& scroll_offset);
 402   gfx::ScrollOffset PullDeltaForMainThread();
 403   gfx::ScrollOffset CurrentScrollOffset() const;
 404   gfx::ScrollOffset BaseScrollOffset() const;
 405   gfx::Vector2dF ScrollDelta() const;
 406   void SetScrollDelta(const gfx::Vector2dF& delta);
 407
 408   gfx::ScrollOffset MaxScrollOffset() const;
 409   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
 410   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 411   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 412                             LayerImpl* scrollbar_clip_layer,
 413                             bool on_resize) const;
 414   void SetScrollCompensationAdjustment(const gfx::Vector2dF& scroll_offset) {
 415     scroll_compensation_adjustment_ = scroll_offset;
 416   }
 417   gfx::Vector2dF ScrollCompensationAdjustment() const {
 418     return scroll_compensation_adjustment_;
 419   }
 420
 421   // Returns the delta of the scroll that was outside of the bounds of the
 422   // initial scroll
 423   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 424
 425   void SetScrollClipLayer(int scroll_clip_layer_id);
 426   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 427   bool scrollable() const { return !!scroll_clip_layer_; }
 428
 429   void set_user_scrollable_horizontal(bool scrollable) {
 430     user_scrollable_horizontal_ = scrollable;
 431   }
 432   bool user_scrollable_horizontal() const {
 433     return user_scrollable_horizontal_;
 434   }
 435   void set_user_scrollable_vertical(bool scrollable) {
 436     user_scrollable_vertical_ = scrollable;
 437   }
 438   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 439
 440   bool user_scrollable(ScrollbarOrientation orientation) const;
 441
 442   void ApplySentScrollDeltasFromAbortedCommit();
 443
 444   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 445     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 446   }
 447   bool should_scroll_on_main_thread() const {
 448     return should_scroll_on_main_thread_;
 449   }
 450
 451   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 452     have_wheel_event_handlers_ = have_wheel_event_handlers;
 453   }
 454   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 455
 456   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 457     have_scroll_event_handlers_ = have_scroll_event_handlers;
 458   }
 459   bool have_scroll_event_handlers() const {
 460     return have_scroll_event_handlers_;
 461   }
 462
 463   void SetNonFastScrollableRegion(const Region& region) {
 464     non_fast_scrollable_region_ = region;
 465   }
 466   const Region& non_fast_scrollable_region() const {
 467     return non_fast_scrollable_region_;
 468   }
 469
 470   void SetTouchEventHandlerRegion(const Region& region) {
 471     touch_event_handler_region_ = region;
 472   }
 473   const Region& touch_event_handler_region() const {
 474     return touch_event_handler_region_;
 475   }
 476
 477   void SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
 478     scroll_blocks_on_ = scroll_blocks_on;
 479   }
 480   ScrollBlocksOn scroll_blocks_on() const { return scroll_blocks_on_; }
 481   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 482     draw_checkerboard_for_missing_tiles_ = checkerboard;
 483   }
 484   bool draw_checkerboard_for_missing_tiles() const {
 485     return draw_checkerboard_for_missing_tiles_;
 486   }
 487
 488   InputHandler::ScrollStatus TryScroll(
 489       const gfx::PointF& screen_space_point,
 490       InputHandler::ScrollInputType type,
 491       ScrollBlocksOn effective_block_mode) const;
 492
 493   void SetDoubleSided(bool double_sided);
 494   bool double_sided() const { return double_sided_; }
 495
 496   void SetTransform(const gfx::Transform& transform);
 497   const gfx::Transform& transform() const { return transform_; }
 498   bool TransformIsAnimating() const;
 499   bool TransformIsAnimatingOnImplOnly() const;
 500   void SetTransformAndInvertibility(const gfx::Transform& transform,
 501                                     bool transform_is_invertible);
 502   bool transform_is_invertible() const { return transform_is_invertible_; }
 503
 504   // Note this rect is in layer space (not content space).
 505   void SetUpdateRect(const gfx::Rect& update_rect);
 506   gfx::Rect update_rect() const { return update_rect_; }
 507
 508   void AddDamageRect(const gfx::RectF& damage_rect);
 509
 510   const gfx::RectF& damage_rect() const { return damage_rect_; }
 511
 512   virtual base::DictionaryValue* LayerTreeAsJson() const;
 513
 514   void SetStackingOrderChanged(bool stacking_order_changed);
 515
 516   bool LayerPropertyChanged() const { return layer_property_changed_; }
 517
 518   void ResetAllChangeTrackingForSubtree();
 519
 520   LayerAnimationController* layer_animation_controller() {
 521     return layer_animation_controller_.get();
 522   }
 523
 524   const LayerAnimationController* layer_animation_controller() const {
 525     return layer_animation_controller_.get();
 526   }
 527
 528   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
 529
 530   virtual void DidBecomeActive();
 531
 532   virtual void DidBeginTracing();
 533
 534   // Release resources held by this layer. Called when the output surface
 535   // that rendered this layer was lost or a rendering mode switch has occured.
 536   virtual void ReleaseResources();
 537
 538   // Recreate resources that are required after they were released by a
 539   // ReleaseResources call.
 540   virtual void RecreateResources();
 541
 542   ScrollbarAnimationController* scrollbar_animation_controller() const {
 543     return scrollbar_animation_controller_.get();
 544   }
 545
 546   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 547   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 548   void ClearScrollbars();
 549   void AddScrollbar(ScrollbarLayerImplBase* layer);
 550   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 551   bool HasScrollbar(ScrollbarOrientation orientation) const;
 552   void ScrollbarParametersDidChange(bool on_resize);
 553   int clip_height() {
 554     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 555   }
 556
 557   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
 558
 559   virtual skia::RefPtr<SkPicture> GetPicture();
 560
 561   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 562   virtual void PushPropertiesTo(LayerImpl* layer);
 563
 564   virtual void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
 565   virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
 566
 567   virtual size_t GPUMemoryUsageInBytes() const;
 568
 569   void SetNeedsPushProperties();
 570   void AddDependentNeedsPushProperties();
 571   void RemoveDependentNeedsPushProperties();
 572   bool parent_should_know_need_push_properties() const {
 573     return needs_push_properties() || descendant_needs_push_properties();
 574   }
 575
 576   bool needs_push_properties() const { return needs_push_properties_; }
 577   bool descendant_needs_push_properties() const {
 578     return num_dependents_need_push_properties_ > 0;
 579   }
 580
 581   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 582
 583   virtual void SetDebugInfo(
 584       scoped_refptr<base::trace_event::ConvertableToTraceFormat> other);
 585
 586   bool IsDrawnRenderSurfaceLayerListMember() const;
 587
 588   void Set3dSortingContextId(int id);
 589   int sorting_context_id() { return sorting_context_id_; }
 590
 591   void PassFrameTimingRequests(
 592       std::vector<FrameTimingRequest>* frame_timing_requests);
 593   const std::vector<FrameTimingRequest>& frame_timing_requests() const {
 594     return frame_timing_requests_;
 595   }
 596
 597   SyncedScrollOffset* synced_scroll_offset() { return scroll_offset_.get(); }
 598
 599  protected:
 600   LayerImpl(LayerTreeImpl* layer_impl,
 601             int id,
 602             scoped_refptr<SyncedScrollOffset> scroll_offset);
 603   LayerImpl(LayerTreeImpl* layer_impl, int id);
 604
 605   // Get the color and size of the layer's debug border.
 606   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 607
 608   void AppendDebugBorderQuad(RenderPass* render_pass,
 609                              const gfx::Size& content_bounds,
 610                              const SharedQuadState* shared_quad_state,
 611                              AppendQuadsData* append_quads_data) const;
 612   void AppendDebugBorderQuad(RenderPass* render_pass,
 613                              const gfx::Size& content_bounds,
 614                              const SharedQuadState* shared_quad_state,
 615                              AppendQuadsData* append_quads_data,
 616                              SkColor color,
 617                              float width) const;
 618
 619   void NoteLayerPropertyChanged();
 620   void NoteLayerPropertyChangedForSubtree();
 621
 622   // Note carefully this does not affect the current layer.
 623   void NoteLayerPropertyChangedForDescendants();
 624
 625  private:
 626   void PushScrollOffset(const gfx::ScrollOffset* scroll_offset);
 627   void DidUpdateScrollOffset();
 628   void NoteLayerPropertyChangedForDescendantsInternal();
 629
 630   virtual const char* LayerTypeAsString() const;
 631
 632   // Properties internal to LayerImpl
 633   LayerImpl* parent_;
 634   OwnedLayerImplList children_;
 635
 636   LayerImpl* scroll_parent_;
 637
 638   // Storing a pointer to a set rather than a set since this will be rarely
 639   // used. If this pointer turns out to be too heavy, we could have this (and
 640   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 641   // map somewhere.
 642   scoped_ptr<std::set<LayerImpl*>> scroll_children_;
 643
 644   LayerImpl* clip_parent_;
 645   scoped_ptr<std::set<LayerImpl*>> clip_children_;
 646
 647   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 648   // confirm newly assigned layer is still the previous one
 649   int mask_layer_id_;
 650   scoped_ptr<LayerImpl> mask_layer_;
 651   int replica_layer_id_;  // ditto
 652   scoped_ptr<LayerImpl> replica_layer_;
 653   int layer_id_;
 654   LayerTreeImpl* layer_tree_impl_;
 655
 656   // Properties dynamically changeable on active tree.
 657   scoped_refptr<SyncedScrollOffset> scroll_offset_;
 658   gfx::Vector2dF bounds_delta_;
 659
 660   // Properties synchronized from the associated Layer.
 661   gfx::Point3F transform_origin_;
 662   gfx::Size bounds_;
 663   ScrollOffsetDelegate* scroll_offset_delegate_;
 664   LayerImpl* scroll_clip_layer_;
 665   bool scrollable_ : 1;
 666   bool should_scroll_on_main_thread_ : 1;
 667   bool have_wheel_event_handlers_ : 1;
 668   bool have_scroll_event_handlers_ : 1;
 669
 670   static_assert(SCROLL_BLOCKS_ON_MAX < (1 << 3), "ScrollBlocksOn too big");
 671   ScrollBlocksOn scroll_blocks_on_ : 3;
 672
 673   bool user_scrollable_horizontal_ : 1;
 674   bool user_scrollable_vertical_ : 1;
 675   bool stacking_order_changed_ : 1;
 676   // Whether the "back" of this layer should draw.
 677   bool double_sided_ : 1;
 678   bool should_flatten_transform_ : 1;
 679
 680   // Tracks if drawing-related properties have changed since last redraw.
 681   bool layer_property_changed_ : 1;
 682
 683   bool masks_to_bounds_ : 1;
 684   bool contents_opaque_ : 1;
 685   bool is_root_for_isolated_group_ : 1;
 686   bool use_parent_backface_visibility_ : 1;
 687   bool draw_checkerboard_for_missing_tiles_ : 1;
 688   bool draws_content_ : 1;
 689   bool hide_layer_and_subtree_ : 1;
 690
 691   // Cache transform_'s invertibility.
 692   bool transform_is_invertible_ : 1;
 693
 694   // Set for the layer that other layers are fixed to.
 695   bool is_container_for_fixed_position_layers_ : 1;
 696   Region non_fast_scrollable_region_;
 697   Region touch_event_handler_region_;
 698   SkColor background_color_;
 699
 700   float opacity_;
 701   SkXfermode::Mode blend_mode_;
 702   gfx::PointF position_;
 703   gfx::Transform transform_;
 704
 705   LayerPositionConstraint position_constraint_;
 706
 707   gfx::Vector2dF scroll_compensation_adjustment_;
 708
 709   int num_descendants_that_draw_content_;
 710
 711   // The global depth value of the center of the layer. This value is used
 712   // to sort layers from back to front.
 713   float draw_depth_;
 714
 715   FilterOperations filters_;
 716   FilterOperations background_filters_;
 717
 718  protected:
 719   friend class TreeSynchronizer;
 720
 721   // This flag is set when the layer needs to push properties to the active
 722   // side.
 723   bool needs_push_properties_;
 724
 725   // The number of direct children or dependent layers that need to be recursed
 726   // to in order for them or a descendent of them to push properties to the
 727   // active side.
 728   int num_dependents_need_push_properties_;
 729
 730   // Layers that share a sorting context id will be sorted together in 3d
 731   // space.  0 is a special value that means this layer will not be sorted and
 732   // will be drawn in paint order.
 733   int sorting_context_id_;
 734
 735   DrawMode current_draw_mode_;
 736
 737  private:
 738   // Rect indicating what was repainted/updated during update.
 739   // Note that plugin layers bypass this and leave it empty.
 740   // Uses layer (not content) space.
 741   gfx::Rect update_rect_;
 742
 743   // This rect is in layer space.
 744   gfx::RectF damage_rect_;
 745
 746   // Manages animations for this layer.
 747   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 748
 749   // Manages scrollbars for this layer
 750   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 751
 752   scoped_ptr<ScrollbarSet> scrollbars_;
 753
 754   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 755
 756   // Group of properties that need to be computed based on the layer tree
 757   // hierarchy before layers can be drawn.
 758   DrawProperties<LayerImpl> draw_properties_;
 759
 760   scoped_refptr<base::trace_event::ConvertableToTraceFormat> debug_info_;
 761   scoped_ptr<RenderSurfaceImpl> render_surface_;
 762
 763   std::vector<FrameTimingRequest> frame_timing_requests_;
 764   bool frame_timing_requests_dirty_;
 765
 766   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 767 };
 768
 769 }  // namespace cc
 770
 771 #endif  // CC_LAYERS_LAYER_IMPL_H_