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