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 <map>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/logging.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/values.h"
  16 #include "cc/animation/animation_delegate.h"
  17 #include "cc/animation/layer_animation_controller.h"
  18 #include "cc/animation/layer_animation_value_observer.h"
  19 #include "cc/animation/layer_animation_value_provider.h"
  20 #include "cc/base/cc_export.h"
  21 #include "cc/base/region.h"
  22 #include "cc/base/scoped_ptr_vector.h"
  23 #include "cc/base/synced_property.h"
  24 #include "cc/debug/frame_timing_request.h"
  25 #include "cc/input/input_handler.h"
  26 #include "cc/input/scrollbar.h"
  27 #include "cc/layers/draw_properties.h"
  28 #include "cc/layers/layer_lists.h"
  29 #include "cc/layers/layer_position_constraint.h"
  30 #include "cc/layers/render_surface_impl.h"
  31 #include "cc/layers/scroll_blocks_on.h"
  32 #include "cc/output/filter_operations.h"
  33 #include "cc/quads/shared_quad_state.h"
  34 #include "cc/resources/resource_provider.h"
  35 #include "cc/tiles/tile_priority.h"
  36 #include "skia/ext/refptr.h"
  37 #include "third_party/skia/include/core/SkColor.h"
  38 #include "third_party/skia/include/core/SkImageFilter.h"
  39 #include "third_party/skia/include/core/SkPicture.h"
  40 #include "ui/gfx/geometry/point3_f.h"
  41 #include "ui/gfx/geometry/rect.h"
  42 #include "ui/gfx/geometry/rect_f.h"
  43 #include "ui/gfx/geometry/scroll_offset.h"
  44 #include "ui/gfx/transform.h"
  45
  46 namespace base {
  47 namespace trace_event {
  48 class ConvertableToTraceFormat;
  49 class TracedValue;
  50 }
  51 class DictionaryValue;
  52 }
  53
  54 namespace cc {
  55
  56 class LayerTreeHostImpl;
  57 class LayerTreeImpl;
  58 class MicroBenchmarkImpl;
  59 class Occlusion;
  60 class OpacityTree;
  61 class PrioritizedTile;
  62 class RenderPass;
  63 class RenderPassId;
  64 class Renderer;
  65 class ScrollbarAnimationController;
  66 class ScrollbarLayerImplBase;
  67 class SimpleEnclosedRegion;
  68 class Tile;
  69 class TransformTree;
  70
  71 struct AppendQuadsData;
  72
  73 enum DrawMode {
  74   DRAW_MODE_NONE,
  75   DRAW_MODE_HARDWARE,
  76   DRAW_MODE_SOFTWARE,
  77   DRAW_MODE_RESOURCELESS_SOFTWARE
  78 };
  79
  80 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
  81                             public LayerAnimationValueProvider,
  82                             public AnimationDelegate {
  83  public:
  84   typedef SyncedProperty<AdditionGroup<gfx::ScrollOffset>> SyncedScrollOffset;
  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(
  92       LayerTreeImpl* tree_impl,
  93       int id,
  94       scoped_refptr<SyncedScrollOffset> scroll_offset) {
  95     return make_scoped_ptr(new LayerImpl(tree_impl, id, scroll_offset));
  96   }
  97
  98   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
  99     return make_scoped_ptr(new LayerImpl(tree_impl, id));
 100   }
 101
 102   ~LayerImpl() override;
 103
 104   int id() const { return layer_id_; }
 105
 106   // LayerAnimationValueProvider implementation.
 107   gfx::ScrollOffset ScrollOffsetForAnimation() const override;
 108
 109   // LayerAnimationValueObserver implementation.
 110   void OnFilterAnimated(const FilterOperations& filters) override;
 111   void OnOpacityAnimated(float opacity) override;
 112   void OnTransformAnimated(const gfx::Transform& transform) override;
 113   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override;
 114   void OnAnimationWaitingForDeletion() override;
 115   bool IsActive() const override;
 116
 117   // AnimationDelegate implementation.
 118   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
 119                               Animation::TargetProperty target_property,
 120                               int group) override{};
 121   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
 122                                Animation::TargetProperty target_property,
 123                                int group) override;
 124
 125   // Tree structure.
 126   LayerImpl* parent() { return parent_; }
 127   const LayerImpl* parent() const { return parent_; }
 128   const OwnedLayerImplList& children() const { return children_; }
 129   OwnedLayerImplList& children() { return children_; }
 130   LayerImpl* child_at(size_t index) const { return children_[index]; }
 131   void AddChild(scoped_ptr<LayerImpl> child);
 132   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
 133   void SetParent(LayerImpl* parent);
 134
 135   // Warning: This does not preserve tree structure invariants.
 136   void ClearChildList();
 137
 138   bool HasAncestor(const LayerImpl* ancestor) const;
 139
 140   void SetScrollParent(LayerImpl* parent);
 141
 142   LayerImpl* scroll_parent() { return scroll_parent_; }
 143   const LayerImpl* scroll_parent() const { return scroll_parent_; }
 144
 145   void SetScrollChildren(std::set<LayerImpl*>* children);
 146
 147   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
 148   const std::set<LayerImpl*>* scroll_children() const {
 149     return scroll_children_.get();
 150   }
 151
 152   void set_property_tree_sequence_number(int sequence_number) {}
 153
 154   void SetTransformTreeIndex(int index);
 155   int transform_tree_index() const { return transform_tree_index_; }
 156
 157   void SetClipTreeIndex(int index);
 158   int clip_tree_index() const { return clip_tree_index_; }
 159
 160   void SetOpacityTreeIndex(int index);
 161   int opacity_tree_index() const { return opacity_tree_index_; }
 162
 163   void set_offset_to_transform_parent(const gfx::Vector2dF& offset) {
 164     offset_to_transform_parent_ = offset;
 165     SetNeedsPushProperties();
 166   }
 167   gfx::Vector2dF offset_to_transform_parent() const {
 168     return offset_to_transform_parent_;
 169   }
 170
 171   const gfx::Rect& visible_rect_from_property_trees() const {
 172     return visible_rect_from_property_trees_;
 173   }
 174   void set_visible_rect_from_property_trees(const gfx::Rect& rect) {
 175     visible_rect_from_property_trees_ = rect;
 176   }
 177
 178   void set_should_flatten_transform_from_property_tree(bool should_flatten) {
 179     should_flatten_transform_from_property_tree_ = should_flatten;
 180     SetNeedsPushProperties();
 181   }
 182   bool should_flatten_transform_from_property_tree() const {
 183     return should_flatten_transform_from_property_tree_;
 184   }
 185
 186   void UpdatePropertyTreeTransform();
 187   void UpdatePropertyTreeOpacity();
 188
 189   // For compatibility with Layer.
 190   bool has_render_surface() const { return !!render_surface(); }
 191
 192   void SetNumDescendantsThatDrawContent(int num_descendants);
 193   void SetClipParent(LayerImpl* ancestor);
 194
 195   LayerImpl* clip_parent() {
 196     return clip_parent_;
 197   }
 198   const LayerImpl* clip_parent() const {
 199     return clip_parent_;
 200   }
 201
 202   void SetClipChildren(std::set<LayerImpl*>* children);
 203
 204   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
 205   const std::set<LayerImpl*>* clip_children() const {
 206     return clip_children_.get();
 207   }
 208
 209   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
 210   // Can only be called when the layer has a copy request.
 211   void TakeCopyRequestsAndTransformToTarget(
 212       ScopedPtrVector<CopyOutputRequest>* request);
 213   bool HasCopyRequest() const { return !copy_requests_.empty(); }
 214
 215   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
 216   LayerImpl* mask_layer() { return mask_layer_.get(); }
 217   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
 218   scoped_ptr<LayerImpl> TakeMaskLayer();
 219
 220   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
 221   LayerImpl* replica_layer() { return replica_layer_.get(); }
 222   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
 223   scoped_ptr<LayerImpl> TakeReplicaLayer();
 224
 225   bool has_mask() const { return mask_layer_; }
 226   bool has_replica() const { return replica_layer_; }
 227   bool replica_has_mask() const {
 228     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
 229   }
 230
 231   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
 232
 233   void PopulateSharedQuadState(SharedQuadState* state) const;
 234   void PopulateScaledSharedQuadState(SharedQuadState* state, float scale) const;
 235   // WillDraw must be called before AppendQuads. If WillDraw returns false,
 236   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
 237   // DidDraw is guaranteed to be called before another WillDraw or before
 238   // the layer is destroyed. To enforce this, any class that overrides
 239   // WillDraw/DidDraw must call the base class version only if WillDraw
 240   // returns true.
 241   virtual bool WillDraw(DrawMode draw_mode,
 242                         ResourceProvider* resource_provider);
 243   virtual void AppendQuads(RenderPass* render_pass,
 244                            AppendQuadsData* append_quads_data) {}
 245   virtual void DidDraw(ResourceProvider* resource_provider);
 246
 247   // Verify that the resource ids in the quad are valid.
 248   void ValidateQuadResources(DrawQuad* quad) const {
 249 #if DCHECK_IS_ON()
 250     ValidateQuadResourcesInternal(quad);
 251 #endif
 252   }
 253
 254   virtual void GetContentsResourceId(ResourceId* resource_id,
 255                                      gfx::Size* resource_size) const;
 256
 257   virtual bool HasDelegatedContent() const;
 258   virtual bool HasContributingDelegatedRenderPasses() const;
 259   virtual RenderPassId FirstContributingRenderPassId() const;
 260   virtual RenderPassId NextContributingRenderPassId(RenderPassId id) const;
 261
 262   virtual void NotifyTileStateChanged(const Tile* tile) {}
 263
 264   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
 265
 266   // Returns true if this layer has content to draw.
 267   void SetDrawsContent(bool draws_content);
 268   bool DrawsContent() const { return draws_content_; }
 269
 270   int NumDescendantsThatDrawContent() const;
 271   void SetHideLayerAndSubtree(bool hide);
 272   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 273
 274   void SetTransformOrigin(const gfx::Point3F& transform_origin);
 275   gfx::Point3F transform_origin() const { return transform_origin_; }
 276
 277   void SetBackgroundColor(SkColor background_color);
 278   SkColor background_color() const { return background_color_; }
 279   // If contents_opaque(), return an opaque color else return a
 280   // non-opaque color.  Tries to return background_color(), if possible.
 281   SkColor SafeOpaqueBackgroundColor() const;
 282
 283   void SetFilters(const FilterOperations& filters);
 284   const FilterOperations& filters() const { return filters_; }
 285   bool FilterIsAnimating() const;
 286   bool FilterIsAnimatingOnImplOnly() const;
 287
 288   void SetBackgroundFilters(const FilterOperations& filters);
 289   const FilterOperations& background_filters() const {
 290     return background_filters_;
 291   }
 292
 293   void SetMasksToBounds(bool masks_to_bounds);
 294   bool masks_to_bounds() const { return masks_to_bounds_; }
 295
 296   void SetContentsOpaque(bool opaque);
 297   bool contents_opaque() const { return contents_opaque_; }
 298
 299   void SetOpacity(float opacity);
 300   float opacity() const { return opacity_; }
 301   bool OpacityIsAnimating() const;
 302   bool OpacityIsAnimatingOnImplOnly() const;
 303
 304   void SetBlendMode(SkXfermode::Mode);
 305   SkXfermode::Mode blend_mode() const { return blend_mode_; }
 306   bool uses_default_blend_mode() const {
 307     return blend_mode_ == SkXfermode::kSrcOver_Mode;
 308   }
 309
 310   void SetIsRootForIsolatedGroup(bool root);
 311   bool is_root_for_isolated_group() const {
 312     return is_root_for_isolated_group_;
 313   }
 314
 315   void SetPosition(const gfx::PointF& position);
 316   gfx::PointF position() const { return position_; }
 317
 318   void SetIsContainerForFixedPositionLayers(bool container) {
 319     is_container_for_fixed_position_layers_ = container;
 320   }
 321   // This is a non-trivial function in Layer.
 322   bool IsContainerForFixedPositionLayers() const {
 323     return is_container_for_fixed_position_layers_;
 324   }
 325
 326   gfx::Vector2dF FixedContainerSizeDelta() const;
 327
 328   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
 329     position_constraint_ = constraint;
 330   }
 331   const LayerPositionConstraint& position_constraint() const {
 332     return position_constraint_;
 333   }
 334
 335   void SetShouldFlattenTransform(bool flatten);
 336   bool should_flatten_transform() const { return should_flatten_transform_; }
 337
 338   bool Is3dSorted() const { return sorting_context_id_ != 0; }
 339
 340   void SetUseParentBackfaceVisibility(bool use) {
 341     use_parent_backface_visibility_ = use;
 342   }
 343   bool use_parent_backface_visibility() const {
 344     return use_parent_backface_visibility_;
 345   }
 346
 347   bool ShowDebugBorders() const;
 348
 349   // These invalidate the host's render surface layer list.  The caller
 350   // is responsible for calling set_needs_update_draw_properties on the tree
 351   // so that its list can be recreated.
 352   void ClearRenderSurfaceLayerList();
 353   void SetHasRenderSurface(bool has_render_surface);
 354
 355   RenderSurfaceImpl* render_surface() const { return render_surface_.get(); }
 356
 357   DrawProperties<LayerImpl>& draw_properties() {
 358     return draw_properties_;
 359   }
 360   const DrawProperties<LayerImpl>& draw_properties() const {
 361     return draw_properties_;
 362   }
 363
 364   // The following are shortcut accessors to get various information from
 365   // draw_properties_
 366   const gfx::Transform& draw_transform() const {
 367     return draw_properties_.target_space_transform;
 368   }
 369   const gfx::Transform& screen_space_transform() const {
 370     return draw_properties_.screen_space_transform;
 371   }
 372   float draw_opacity() const { return draw_properties_.opacity; }
 373   SkXfermode::Mode draw_blend_mode() const {
 374     return draw_properties_.blend_mode;
 375   }
 376   bool draw_opacity_is_animating() const {
 377     return draw_properties_.opacity_is_animating;
 378   }
 379   bool draw_transform_is_animating() const {
 380     return draw_properties_.target_space_transform_is_animating;
 381   }
 382   bool screen_space_transform_is_animating() const {
 383     return draw_properties_.screen_space_transform_is_animating;
 384   }
 385   bool screen_space_opacity_is_animating() const {
 386     return draw_properties_.screen_space_opacity_is_animating;
 387   }
 388   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
 389   bool is_clipped() const { return draw_properties_.is_clipped; }
 390   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
 391   gfx::Rect drawable_content_rect() const {
 392     return draw_properties_.drawable_content_rect;
 393   }
 394   gfx::Rect visible_layer_rect() const {
 395     return draw_properties_.visible_layer_rect;
 396   }
 397   LayerImpl* render_target() {
 398     DCHECK(!draw_properties_.render_target ||
 399            draw_properties_.render_target->render_surface());
 400     return draw_properties_.render_target;
 401   }
 402   const LayerImpl* render_target() const {
 403     DCHECK(!draw_properties_.render_target ||
 404            draw_properties_.render_target->render_surface());
 405     return draw_properties_.render_target;
 406   }
 407
 408   size_t num_unclipped_descendants() const {
 409     return draw_properties_.num_unclipped_descendants;
 410   }
 411
 412   // The client should be responsible for setting bounds, content bounds and
 413   // contents scale to appropriate values. LayerImpl doesn't calculate any of
 414   // them from the other values.
 415
 416   void SetBounds(const gfx::Size& bounds);
 417   gfx::Size bounds() const;
 418   // Like bounds() but doesn't snap to int. Lossy on giant pages (e.g. millions
 419   // of pixels) due to use of single precision float.
 420   gfx::SizeF BoundsForScrolling() const;
 421   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
 422   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 423
 424   bool IsExternalScrollActive() const;
 425
 426   void SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset);
 427   void SetCurrentScrollOffsetFromDelegate(
 428       const gfx::ScrollOffset& scroll_offset);
 429   void PushScrollOffsetFromMainThread(const gfx::ScrollOffset& scroll_offset);
 430   // This method is similar to PushScrollOffsetFromMainThread but will cause the
 431   // scroll offset given to clobber any scroll changes on the active tree in the
 432   // time until this value is pushed to the active tree.
 433   void PushScrollOffsetFromMainThreadAndClobberActiveValue(
 434       const gfx::ScrollOffset& scroll_offset);
 435   gfx::ScrollOffset PullDeltaForMainThread();
 436   gfx::ScrollOffset CurrentScrollOffset() const;
 437   gfx::ScrollOffset BaseScrollOffset() const;
 438   gfx::Vector2dF ScrollDelta() const;
 439   void SetScrollDelta(const gfx::Vector2dF& delta);
 440
 441   gfx::ScrollOffset MaxScrollOffset() const;
 442   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
 443   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 444   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
 445                             LayerImpl* scrollbar_clip_layer,
 446                             bool on_resize) const;
 447   void SetScrollCompensationAdjustment(const gfx::Vector2dF& scroll_offset) {
 448     scroll_compensation_adjustment_ = scroll_offset;
 449   }
 450   gfx::Vector2dF ScrollCompensationAdjustment() const {
 451     return scroll_compensation_adjustment_;
 452   }
 453
 454   // Returns the delta of the scroll that was outside of the bounds of the
 455   // initial scroll
 456   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 457
 458   void SetScrollClipLayer(int scroll_clip_layer_id);
 459   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
 460   bool scrollable() const { return !!scroll_clip_layer_; }
 461
 462   void set_user_scrollable_horizontal(bool scrollable) {
 463     user_scrollable_horizontal_ = scrollable;
 464   }
 465   bool user_scrollable_horizontal() const {
 466     return user_scrollable_horizontal_;
 467   }
 468   void set_user_scrollable_vertical(bool scrollable) {
 469     user_scrollable_vertical_ = scrollable;
 470   }
 471   bool user_scrollable_vertical() const { return user_scrollable_vertical_; }
 472
 473   bool user_scrollable(ScrollbarOrientation orientation) const;
 474
 475   void ApplySentScrollDeltasFromAbortedCommit();
 476
 477   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 478     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 479   }
 480   bool should_scroll_on_main_thread() const {
 481     return should_scroll_on_main_thread_;
 482   }
 483
 484   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 485     have_wheel_event_handlers_ = have_wheel_event_handlers;
 486   }
 487   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
 488
 489   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 490     have_scroll_event_handlers_ = have_scroll_event_handlers;
 491   }
 492   bool have_scroll_event_handlers() const {
 493     return have_scroll_event_handlers_;
 494   }
 495
 496   void SetNonFastScrollableRegion(const Region& region) {
 497     non_fast_scrollable_region_ = region;
 498   }
 499   const Region& non_fast_scrollable_region() const {
 500     return non_fast_scrollable_region_;
 501   }
 502
 503   void SetTouchEventHandlerRegion(const Region& region) {
 504     touch_event_handler_region_ = region;
 505   }
 506   const Region& touch_event_handler_region() const {
 507     return touch_event_handler_region_;
 508   }
 509
 510   void SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
 511     scroll_blocks_on_ = scroll_blocks_on;
 512   }
 513   ScrollBlocksOn scroll_blocks_on() const { return scroll_blocks_on_; }
 514   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
 515     draw_checkerboard_for_missing_tiles_ = checkerboard;
 516   }
 517   bool draw_checkerboard_for_missing_tiles() const {
 518     return draw_checkerboard_for_missing_tiles_;
 519   }
 520
 521   InputHandler::ScrollStatus TryScroll(
 522       const gfx::PointF& screen_space_point,
 523       InputHandler::ScrollInputType type,
 524       ScrollBlocksOn effective_block_mode) const;
 525
 526   void SetDoubleSided(bool double_sided);
 527   bool double_sided() const { return double_sided_; }
 528
 529   void SetTransform(const gfx::Transform& transform);
 530   const gfx::Transform& transform() const { return transform_; }
 531   bool TransformIsAnimating() const;
 532   bool TransformIsAnimatingOnImplOnly() const;
 533   void SetTransformAndInvertibility(const gfx::Transform& transform,
 534                                     bool transform_is_invertible);
 535   bool transform_is_invertible() const { return transform_is_invertible_; }
 536
 537   // Note this rect is in layer space (not content space).
 538   void SetUpdateRect(const gfx::Rect& update_rect);
 539   gfx::Rect update_rect() const { return update_rect_; }
 540
 541   void AddDamageRect(const gfx::RectF& damage_rect);
 542
 543   const gfx::RectF& damage_rect() const { return damage_rect_; }
 544
 545   virtual base::DictionaryValue* LayerTreeAsJson() const;
 546
 547   void SetStackingOrderChanged(bool stacking_order_changed);
 548
 549   bool LayerPropertyChanged() const { return layer_property_changed_; }
 550
 551   void ResetAllChangeTrackingForSubtree();
 552
 553   LayerAnimationController* layer_animation_controller() {
 554     return layer_animation_controller_.get();
 555   }
 556
 557   const LayerAnimationController* layer_animation_controller() const {
 558     return layer_animation_controller_.get();
 559   }
 560
 561   virtual SimpleEnclosedRegion VisibleOpaqueRegion() const;
 562
 563   virtual void DidBecomeActive();
 564
 565   virtual void DidBeginTracing();
 566
 567   // Release resources held by this layer. Called when the output surface
 568   // that rendered this layer was lost or a rendering mode switch has occured.
 569   virtual void ReleaseResources();
 570
 571   // Recreate resources that are required after they were released by a
 572   // ReleaseResources call.
 573   virtual void RecreateResources();
 574
 575   ScrollbarAnimationController* scrollbar_animation_controller() const {
 576     return scrollbar_animation_controller_.get();
 577   }
 578
 579   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
 580   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
 581   void ClearScrollbars();
 582   void AddScrollbar(ScrollbarLayerImplBase* layer);
 583   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
 584   bool HasScrollbar(ScrollbarOrientation orientation) const;
 585   void ScrollbarParametersDidChange(bool on_resize);
 586   int clip_height() {
 587     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
 588   }
 589
 590   virtual skia::RefPtr<SkPicture> GetPicture();
 591
 592   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
 593   virtual void PushPropertiesTo(LayerImpl* layer);
 594
 595   virtual void GetAllPrioritizedTilesForTracing(
 596       std::vector<PrioritizedTile>* prioritized_tiles) const;
 597   virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
 598
 599   virtual size_t GPUMemoryUsageInBytes() const;
 600
 601   void SetNeedsPushProperties();
 602   void AddDependentNeedsPushProperties();
 603   void RemoveDependentNeedsPushProperties();
 604   bool parent_should_know_need_push_properties() const {
 605     return needs_push_properties() || descendant_needs_push_properties();
 606   }
 607
 608   bool needs_push_properties() const { return needs_push_properties_; }
 609   bool descendant_needs_push_properties() const {
 610     return num_dependents_need_push_properties_ > 0;
 611   }
 612
 613   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
 614
 615   virtual void SetDebugInfo(
 616       scoped_refptr<base::trace_event::ConvertableToTraceFormat> other);
 617
 618   bool IsDrawnRenderSurfaceLayerListMember() const;
 619
 620   void Set3dSortingContextId(int id);
 621   int sorting_context_id() { return sorting_context_id_; }
 622
 623   void SetFrameTimingRequests(
 624       const std::vector<FrameTimingRequest>& frame_timing_requests);
 625   const std::vector<FrameTimingRequest>& frame_timing_requests() const {
 626     return frame_timing_requests_;
 627   }
 628   void GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids);
 629
 630   SyncedScrollOffset* synced_scroll_offset() { return scroll_offset_.get(); }
 631
 632   // Get the correct invalidation region instead of conservative Rect
 633   // for layers that provide it.
 634   virtual Region GetInvalidationRegion();
 635
 636   virtual gfx::Rect GetEnclosingRectInTargetSpace() const;
 637
 638   void set_visited(bool visited) { visited_ = visited; }
 639
 640   bool visited() { return visited_; }
 641
 642   void set_layer_or_descendant_is_drawn(bool layer_or_descendant_is_drawn) {
 643     layer_or_descendant_is_drawn_ = layer_or_descendant_is_drawn;
 644   }
 645
 646   bool layer_or_descendant_is_drawn() { return layer_or_descendant_is_drawn_; }
 647
 648   void set_sorted_for_recursion(bool sorted_for_recursion) {
 649     sorted_for_recursion_ = sorted_for_recursion;
 650   }
 651
 652   bool sorted_for_recursion() { return sorted_for_recursion_; }
 653
 654   void UpdatePropertyTreeForScrollingIfNeeded();
 655
 656  protected:
 657   LayerImpl(LayerTreeImpl* layer_impl,
 658             int id,
 659             scoped_refptr<SyncedScrollOffset> scroll_offset);
 660   LayerImpl(LayerTreeImpl* layer_impl, int id);
 661
 662   // Get the color and size of the layer's debug border.
 663   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
 664
 665   void AppendDebugBorderQuad(RenderPass* render_pass,
 666                              const gfx::Size& bounds,
 667                              const SharedQuadState* shared_quad_state,
 668                              AppendQuadsData* append_quads_data) const;
 669   void AppendDebugBorderQuad(RenderPass* render_pass,
 670                              const gfx::Size& bounds,
 671                              const SharedQuadState* shared_quad_state,
 672                              AppendQuadsData* append_quads_data,
 673                              SkColor color,
 674                              float width) const;
 675
 676   void NoteLayerPropertyChanged();
 677   void NoteLayerPropertyChangedForSubtree();
 678
 679   // Note carefully this does not affect the current layer.
 680   void NoteLayerPropertyChangedForDescendants();
 681
 682   gfx::Rect GetScaledEnclosingRectInTargetSpace(float scale) const;
 683
 684  private:
 685   void ValidateQuadResourcesInternal(DrawQuad* quad) const;
 686
 687   void PushScrollOffset(const gfx::ScrollOffset* scroll_offset);
 688   // If the new scroll offset is assigned from the root scroll offset delegate,
 689   // LayerImpl won't inform the root scroll offset delegate about the scroll
 690   // change to avoid feedback.
 691   void DidUpdateScrollOffset(bool is_from_root_delegate);
 692   void NoteLayerPropertyChangedForDescendantsInternal();
 693
 694   virtual const char* LayerTypeAsString() const;
 695
 696   // Properties internal to LayerImpl
 697   LayerImpl* parent_;
 698   OwnedLayerImplList children_;
 699
 700   LayerImpl* scroll_parent_;
 701
 702   // Storing a pointer to a set rather than a set since this will be rarely
 703   // used. If this pointer turns out to be too heavy, we could have this (and
 704   // the scroll parent above) be stored in a LayerImpl -> scroll_info
 705   // map somewhere.
 706   scoped_ptr<std::set<LayerImpl*>> scroll_children_;
 707
 708   LayerImpl* clip_parent_;
 709   scoped_ptr<std::set<LayerImpl*>> clip_children_;
 710
 711   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
 712   // confirm newly assigned layer is still the previous one
 713   int mask_layer_id_;
 714   scoped_ptr<LayerImpl> mask_layer_;
 715   int replica_layer_id_;  // ditto
 716   scoped_ptr<LayerImpl> replica_layer_;
 717   int layer_id_;
 718   LayerTreeImpl* layer_tree_impl_;
 719
 720   // Properties dynamically changeable on active tree.
 721   scoped_refptr<SyncedScrollOffset> scroll_offset_;
 722   gfx::Vector2dF bounds_delta_;
 723
 724   // Properties synchronized from the associated Layer.
 725   gfx::Point3F transform_origin_;
 726   gfx::Size bounds_;
 727   LayerImpl* scroll_clip_layer_;
 728
 729   gfx::Vector2dF offset_to_transform_parent_;
 730
 731   bool scrollable_ : 1;
 732   bool should_scroll_on_main_thread_ : 1;
 733   bool have_wheel_event_handlers_ : 1;
 734   bool have_scroll_event_handlers_ : 1;
 735
 736   static_assert(SCROLL_BLOCKS_ON_MAX < (1 << 3), "ScrollBlocksOn too big");
 737   ScrollBlocksOn scroll_blocks_on_ : 3;
 738
 739   bool user_scrollable_horizontal_ : 1;
 740   bool user_scrollable_vertical_ : 1;
 741   bool stacking_order_changed_ : 1;
 742   // Whether the "back" of this layer should draw.
 743   bool double_sided_ : 1;
 744   bool should_flatten_transform_ : 1;
 745   bool should_flatten_transform_from_property_tree_ : 1;
 746
 747   // Tracks if drawing-related properties have changed since last redraw.
 748   bool layer_property_changed_ : 1;
 749
 750   bool masks_to_bounds_ : 1;
 751   bool contents_opaque_ : 1;
 752   bool is_root_for_isolated_group_ : 1;
 753   bool use_parent_backface_visibility_ : 1;
 754   bool draw_checkerboard_for_missing_tiles_ : 1;
 755   bool draws_content_ : 1;
 756   bool hide_layer_and_subtree_ : 1;
 757
 758   // Cache transform_'s invertibility.
 759   bool transform_is_invertible_ : 1;
 760
 761   // Set for the layer that other layers are fixed to.
 762   bool is_container_for_fixed_position_layers_ : 1;
 763
 764   Region non_fast_scrollable_region_;
 765   Region touch_event_handler_region_;
 766   SkColor background_color_;
 767
 768   float opacity_;
 769   SkXfermode::Mode blend_mode_;
 770   gfx::PointF position_;
 771   gfx::Transform transform_;
 772
 773   LayerPositionConstraint position_constraint_;
 774
 775   gfx::Vector2dF scroll_compensation_adjustment_;
 776
 777   int num_descendants_that_draw_content_;
 778
 779   gfx::Rect visible_rect_from_property_trees_;
 780   int transform_tree_index_;
 781   int opacity_tree_index_;
 782   int clip_tree_index_;
 783
 784   // The global depth value of the center of the layer. This value is used
 785   // to sort layers from back to front.
 786   float draw_depth_;
 787
 788   FilterOperations filters_;
 789   FilterOperations background_filters_;
 790
 791  protected:
 792   friend class TreeSynchronizer;
 793
 794   // This flag is set when the layer needs to push properties to the active
 795   // side.
 796   bool needs_push_properties_;
 797
 798   // The number of direct children or dependent layers that need to be recursed
 799   // to in order for them or a descendent of them to push properties to the
 800   // active side.
 801   int num_dependents_need_push_properties_;
 802
 803   // Layers that share a sorting context id will be sorted together in 3d
 804   // space.  0 is a special value that means this layer will not be sorted and
 805   // will be drawn in paint order.
 806   int sorting_context_id_;
 807
 808   DrawMode current_draw_mode_;
 809
 810  private:
 811   // Rect indicating what was repainted/updated during update.
 812   // Note that plugin layers bypass this and leave it empty.
 813   // Uses layer (not content) space.
 814   gfx::Rect update_rect_;
 815
 816   // This rect is in layer space.
 817   gfx::RectF damage_rect_;
 818
 819   // Manages animations for this layer.
 820   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 821
 822   // Manages scrollbars for this layer
 823   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
 824
 825   scoped_ptr<ScrollbarSet> scrollbars_;
 826
 827   ScopedPtrVector<CopyOutputRequest> copy_requests_;
 828
 829   // Group of properties that need to be computed based on the layer tree
 830   // hierarchy before layers can be drawn.
 831   DrawProperties<LayerImpl> draw_properties_;
 832
 833   scoped_refptr<base::trace_event::ConvertableToTraceFormat> debug_info_;
 834   scoped_ptr<RenderSurfaceImpl> render_surface_;
 835
 836   std::vector<FrameTimingRequest> frame_timing_requests_;
 837   bool frame_timing_requests_dirty_;
 838   bool visited_;
 839   bool layer_or_descendant_is_drawn_;
 840   bool sorted_for_recursion_;
 841
 842   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 843 };
 844
 845 }  // namespace cc
 846
 847 #endif  // CC_LAYERS_LAYER_IMPL_H_