Home | History | Annotate | Download | only in layers 
      1 // Copyright 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_LAYERS_LAYER_IMPL_H_
      6 #define CC_LAYERS_LAYER_IMPL_H_
      7 
      8 #include <set>
      9 #include <string>
     10 
     11 #include "base/logging.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "base/values.h"
     14 #include "cc/animation/animation_delegate.h"
     15 #include "cc/animation/layer_animation_controller.h"
     16 #include "cc/animation/layer_animation_value_observer.h"
     17 #include "cc/animation/layer_animation_value_provider.h"
     18 #include "cc/base/cc_export.h"
     19 #include "cc/base/region.h"
     20 #include "cc/base/scoped_ptr_vector.h"
     21 #include "cc/input/input_handler.h"
     22 #include "cc/layers/draw_properties.h"
     23 #include "cc/layers/layer_lists.h"
     24 #include "cc/layers/layer_position_constraint.h"
     25 #include "cc/layers/render_surface_impl.h"
     26 #include "cc/output/filter_operations.h"
     27 #include "cc/quads/shared_quad_state.h"
     28 #include "cc/resources/resource_provider.h"
     29 #include "skia/ext/refptr.h"
     30 #include "third_party/skia/include/core/SkColor.h"
     31 #include "third_party/skia/include/core/SkImageFilter.h"
     32 #include "third_party/skia/include/core/SkPicture.h"
     33 #include "ui/gfx/point3_f.h"
     34 #include "ui/gfx/rect.h"
     35 #include "ui/gfx/rect_f.h"
     36 #include "ui/gfx/transform.h"
     37 
     38 namespace base {
     39 namespace debug {
     40 class ConvertableToTraceFormat;
     41 class TracedValue;
     42 }
     43 
     44 class DictionaryValue;
     45 }
     46 
     47 namespace cc {
     48 
     49 class LayerTreeHostImpl;
     50 class LayerTreeImpl;
     51 class MicroBenchmarkImpl;
     52 class Occlusion;
     53 template <typename LayerType>
     54 class OcclusionTracker;
     55 class RenderPass;
     56 class RenderPassId;
     57 class Renderer;
     58 class ScrollbarAnimationController;
     59 class ScrollbarLayerImplBase;
     60 class SimpleEnclosedRegion;
     61 class Tile;
     62 
     63 struct AppendQuadsData;
     64 
     65 enum DrawMode {
     66   DRAW_MODE_NONE,
     67   DRAW_MODE_HARDWARE,
     68   DRAW_MODE_SOFTWARE,
     69   DRAW_MODE_RESOURCELESS_SOFTWARE
     70 };
     71 
     72 class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
     73                             public LayerAnimationValueProvider,
     74                             public AnimationDelegate {
     75  public:
     76   // Allows for the ownership of the total scroll offset to be delegated outside
     77   // of the layer.
     78   class ScrollOffsetDelegate {
     79    public:
     80     virtual void SetTotalScrollOffset(const gfx::Vector2dF& new_value) = 0;
     81     virtual gfx::Vector2dF GetTotalScrollOffset() = 0;
     82     virtual bool IsExternalFlingActive() const = 0;
     83   };
     84 
     85   typedef LayerImplList RenderSurfaceListType;
     86   typedef LayerImplList LayerListType;
     87   typedef RenderSurfaceImpl RenderSurfaceType;
     88 
     89   enum RenderingContextConstants { NO_RENDERING_CONTEXT = 0 };
     90 
     91   static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
     92     return make_scoped_ptr(new LayerImpl(tree_impl, id));
     93   }
     94 
     95   virtual ~LayerImpl();
     96 
     97   int id() const { return layer_id_; }
     98 
     99   // LayerAnimationValueProvider implementation.
    100   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
    101 
    102   // LayerAnimationValueObserver implementation.
    103   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
    104   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
    105   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
    106   virtual void OnScrollOffsetAnimated(
    107       const gfx::Vector2dF& scroll_offset) OVERRIDE;
    108   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
    109   virtual bool IsActive() const OVERRIDE;
    110 
    111   // AnimationDelegate implementation.
    112   virtual void NotifyAnimationStarted(
    113       base::TimeTicks monotonic_time,
    114       Animation::TargetProperty target_property) OVERRIDE{};
    115   virtual void NotifyAnimationFinished(
    116       base::TimeTicks monotonic_time,
    117       Animation::TargetProperty target_property) OVERRIDE;
    118 
    119   // Tree structure.
    120   LayerImpl* parent() { return parent_; }
    121   const LayerImpl* parent() const { return parent_; }
    122   const OwnedLayerImplList& children() const { return children_; }
    123   OwnedLayerImplList& children() { return children_; }
    124   LayerImpl* child_at(size_t index) const { return children_[index]; }
    125   void AddChild(scoped_ptr<LayerImpl> child);
    126   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
    127   void SetParent(LayerImpl* parent);
    128 
    129   // Warning: This does not preserve tree structure invariants.
    130   void ClearChildList();
    131 
    132   bool HasAncestor(const LayerImpl* ancestor) const;
    133 
    134   void SetScrollParent(LayerImpl* parent);
    135 
    136   LayerImpl* scroll_parent() { return scroll_parent_; }
    137   const LayerImpl* scroll_parent() const { return scroll_parent_; }
    138 
    139   void SetScrollChildren(std::set<LayerImpl*>* children);
    140 
    141   std::set<LayerImpl*>* scroll_children() { return scroll_children_.get(); }
    142   const std::set<LayerImpl*>* scroll_children() const {
    143     return scroll_children_.get();
    144   }
    145 
    146   void SetNumDescendantsThatDrawContent(int num_descendants);
    147   void SetClipParent(LayerImpl* ancestor);
    148 
    149   LayerImpl* clip_parent() {
    150     return clip_parent_;
    151   }
    152   const LayerImpl* clip_parent() const {
    153     return clip_parent_;
    154   }
    155 
    156   void SetClipChildren(std::set<LayerImpl*>* children);
    157 
    158   std::set<LayerImpl*>* clip_children() { return clip_children_.get(); }
    159   const std::set<LayerImpl*>* clip_children() const {
    160     return clip_children_.get();
    161   }
    162 
    163   void PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests);
    164   // Can only be called when the layer has a copy request.
    165   void TakeCopyRequestsAndTransformToTarget(
    166       ScopedPtrVector<CopyOutputRequest>* request);
    167   bool HasCopyRequest() const { return !copy_requests_.empty(); }
    168 
    169   void SetMaskLayer(scoped_ptr<LayerImpl> mask_layer);
    170   LayerImpl* mask_layer() { return mask_layer_.get(); }
    171   const LayerImpl* mask_layer() const { return mask_layer_.get(); }
    172   scoped_ptr<LayerImpl> TakeMaskLayer();
    173 
    174   void SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer);
    175   LayerImpl* replica_layer() { return replica_layer_.get(); }
    176   const LayerImpl* replica_layer() const { return replica_layer_.get(); }
    177   scoped_ptr<LayerImpl> TakeReplicaLayer();
    178 
    179   bool has_mask() const { return mask_layer_; }
    180   bool has_replica() const { return replica_layer_; }
    181   bool replica_has_mask() const {
    182     return replica_layer_ && (mask_layer_ || replica_layer_->mask_layer_);
    183   }
    184 
    185   LayerTreeImpl* layer_tree_impl() const { return layer_tree_impl_; }
    186 
    187   void PopulateSharedQuadState(SharedQuadState* state) const;
    188   // WillDraw must be called before AppendQuads. If WillDraw returns false,
    189   // AppendQuads and DidDraw will not be called. If WillDraw returns true,
    190   // DidDraw is guaranteed to be called before another WillDraw or before
    191   // the layer is destroyed. To enforce this, any class that overrides
    192   // WillDraw/DidDraw must call the base class version only if WillDraw
    193   // returns true.
    194   virtual bool WillDraw(DrawMode draw_mode,
    195                         ResourceProvider* resource_provider);
    196   virtual void AppendQuads(RenderPass* render_pass,
    197                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
    198                            AppendQuadsData* append_quads_data) {}
    199   virtual void DidDraw(ResourceProvider* resource_provider);
    200 
    201   virtual ResourceProvider::ResourceId ContentsResourceId() const;
    202 
    203   virtual bool HasDelegatedContent() const;
    204   virtual bool HasContributingDelegatedRenderPasses() const;
    205   virtual RenderPassId FirstContributingRenderPassId() const;
    206   virtual RenderPassId NextContributingRenderPassId(RenderPassId id) const;
    207 
    208   virtual void UpdateTiles(const Occlusion& occlusion_in_layer_space,
    209                            bool resourceless_software_draw) {}
    210   virtual void NotifyTileStateChanged(const Tile* tile) {}
    211 
    212   virtual ScrollbarLayerImplBase* ToScrollbarLayer();
    213 
    214   // Returns true if this layer has content to draw.
    215   void SetDrawsContent(bool draws_content);
    216   bool DrawsContent() const { return draws_content_; }
    217 
    218   int NumDescendantsThatDrawContent() const;
    219   void SetHideLayerAndSubtree(bool hide);
    220   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
    221 
    222   bool force_render_surface() const { return force_render_surface_; }
    223   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
    224 
    225   void SetTransformOrigin(const gfx::Point3F& transform_origin);
    226   gfx::Point3F transform_origin() const { return transform_origin_; }
    227 
    228   void SetBackgroundColor(SkColor background_color);
    229   SkColor background_color() const { return background_color_; }
    230   // If contents_opaque(), return an opaque color else return a
    231   // non-opaque color.  Tries to return background_color(), if possible.
    232   SkColor SafeOpaqueBackgroundColor() const;
    233 
    234   void SetFilters(const FilterOperations& filters);
    235   const FilterOperations& filters() const { return filters_; }
    236   bool FilterIsAnimating() const;
    237   bool FilterIsAnimatingOnImplOnly() const;
    238 
    239   void SetBackgroundFilters(const FilterOperations& filters);
    240   const FilterOperations& background_filters() const {
    241     return background_filters_;
    242   }
    243 
    244   void SetMasksToBounds(bool masks_to_bounds);
    245   bool masks_to_bounds() const { return masks_to_bounds_; }
    246 
    247   void SetContentsOpaque(bool opaque);
    248   bool contents_opaque() const { return contents_opaque_; }
    249 
    250   void SetOpacity(float opacity);
    251   float opacity() const { return opacity_; }
    252   bool OpacityIsAnimating() const;
    253   bool OpacityIsAnimatingOnImplOnly() const;
    254 
    255   void SetBlendMode(SkXfermode::Mode);
    256   SkXfermode::Mode blend_mode() const { return blend_mode_; }
    257   bool uses_default_blend_mode() const {
    258     return blend_mode_ == SkXfermode::kSrcOver_Mode;
    259   }
    260 
    261   void SetIsRootForIsolatedGroup(bool root);
    262   bool is_root_for_isolated_group() const {
    263     return is_root_for_isolated_group_;
    264   }
    265 
    266   void SetPosition(const gfx::PointF& position);
    267   gfx::PointF position() const { return position_; }
    268 
    269   void SetIsContainerForFixedPositionLayers(bool container) {
    270     is_container_for_fixed_position_layers_ = container;
    271   }
    272   // This is a non-trivial function in Layer.
    273   bool IsContainerForFixedPositionLayers() const {
    274     return is_container_for_fixed_position_layers_;
    275   }
    276 
    277   gfx::Vector2dF FixedContainerSizeDelta() const;
    278 
    279   void SetPositionConstraint(const LayerPositionConstraint& constraint) {
    280     position_constraint_ = constraint;
    281   }
    282   const LayerPositionConstraint& position_constraint() const {
    283     return position_constraint_;
    284   }
    285 
    286   void SetShouldFlattenTransform(bool flatten);
    287   bool should_flatten_transform() const { return should_flatten_transform_; }
    288 
    289   bool Is3dSorted() const { return sorting_context_id_ != 0; }
    290 
    291   void SetUseParentBackfaceVisibility(bool use) {
    292     use_parent_backface_visibility_ = use;
    293   }
    294   bool use_parent_backface_visibility() const {
    295     return use_parent_backface_visibility_;
    296   }
    297 
    298   bool ShowDebugBorders() const;
    299 
    300   // These invalidate the host's render surface layer list.  The caller
    301   // is responsible for calling set_needs_update_draw_properties on the tree
    302   // so that its list can be recreated.
    303   void CreateRenderSurface();
    304   void ClearRenderSurface();
    305   void ClearRenderSurfaceLayerList();
    306 
    307   DrawProperties<LayerImpl>& draw_properties() {
    308     return draw_properties_;
    309   }
    310   const DrawProperties<LayerImpl>& draw_properties() const {
    311     return draw_properties_;
    312   }
    313 
    314   // The following are shortcut accessors to get various information from
    315   // draw_properties_
    316   const gfx::Transform& draw_transform() const {
    317     return draw_properties_.target_space_transform;
    318   }
    319   const gfx::Transform& screen_space_transform() const {
    320     return draw_properties_.screen_space_transform;
    321   }
    322   float draw_opacity() const { return draw_properties_.opacity; }
    323   bool draw_opacity_is_animating() const {
    324     return draw_properties_.opacity_is_animating;
    325   }
    326   bool draw_transform_is_animating() const {
    327     return draw_properties_.target_space_transform_is_animating;
    328   }
    329   bool screen_space_transform_is_animating() const {
    330     return draw_properties_.screen_space_transform_is_animating;
    331   }
    332   bool screen_space_opacity_is_animating() const {
    333     return draw_properties_.screen_space_opacity_is_animating;
    334   }
    335   bool can_use_lcd_text() const { return draw_properties_.can_use_lcd_text; }
    336   bool is_clipped() const { return draw_properties_.is_clipped; }
    337   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
    338   gfx::Rect drawable_content_rect() const {
    339     return draw_properties_.drawable_content_rect;
    340   }
    341   gfx::Rect visible_content_rect() const {
    342     return draw_properties_.visible_content_rect;
    343   }
    344   LayerImpl* render_target() {
    345     DCHECK(!draw_properties_.render_target ||
    346            draw_properties_.render_target->render_surface());
    347     return draw_properties_.render_target;
    348   }
    349   const LayerImpl* render_target() const {
    350     DCHECK(!draw_properties_.render_target ||
    351            draw_properties_.render_target->render_surface());
    352     return draw_properties_.render_target;
    353   }
    354   RenderSurfaceImpl* render_surface() const {
    355     return draw_properties_.render_surface.get();
    356   }
    357   int num_unclipped_descendants() const {
    358     return draw_properties_.num_unclipped_descendants;
    359   }
    360 
    361   // The client should be responsible for setting bounds, content bounds and
    362   // contents scale to appropriate values. LayerImpl doesn't calculate any of
    363   // them from the other values.
    364 
    365   void SetBounds(const gfx::Size& bounds);
    366   gfx::Size bounds() const;
    367   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
    368   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
    369 
    370   void SetContentBounds(const gfx::Size& content_bounds);
    371   gfx::Size content_bounds() const { return draw_properties_.content_bounds; }
    372 
    373   float contents_scale_x() const { return draw_properties_.contents_scale_x; }
    374   float contents_scale_y() const { return draw_properties_.contents_scale_y; }
    375   void SetContentsScale(float contents_scale_x, float contents_scale_y);
    376 
    377   void SetScrollOffsetDelegate(ScrollOffsetDelegate* scroll_offset_delegate);
    378   bool IsExternalFlingActive() const;
    379 
    380   void SetScrollOffset(const gfx::Vector2d& scroll_offset);
    381   void SetScrollOffsetAndDelta(const gfx::Vector2d& scroll_offset,
    382                                const gfx::Vector2dF& scroll_delta);
    383   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
    384 
    385   gfx::Vector2d MaxScrollOffset() const;
    386   gfx::Vector2dF ClampScrollToMaxScrollOffset();
    387   void SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
    388                             LayerImpl* scrollbar_clip_layer) const;
    389   void SetScrollDelta(const gfx::Vector2dF& scroll_delta);
    390   gfx::Vector2dF ScrollDelta() const;
    391 
    392   gfx::Vector2dF TotalScrollOffset() const;
    393 
    394   void SetSentScrollDelta(const gfx::Vector2d& sent_scroll_delta);
    395   gfx::Vector2d sent_scroll_delta() const { return sent_scroll_delta_; }
    396 
    397   // Returns the delta of the scroll that was outside of the bounds of the
    398   // initial scroll
    399   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
    400 
    401   void SetScrollClipLayer(int scroll_clip_layer_id);
    402   LayerImpl* scroll_clip_layer() const { return scroll_clip_layer_; }
    403   bool scrollable() const { return !!scroll_clip_layer_; }
    404 
    405   void set_user_scrollable_horizontal(bool scrollable) {
    406     user_scrollable_horizontal_ = scrollable;
    407   }
    408   void set_user_scrollable_vertical(bool scrollable) {
    409     user_scrollable_vertical_ = scrollable;
    410   }
    411 
    412   void ApplySentScrollDeltasFromAbortedCommit();
    413   void ApplyScrollDeltasSinceBeginMainFrame();
    414 
    415   void SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
    416     should_scroll_on_main_thread_ = should_scroll_on_main_thread;
    417   }
    418   bool should_scroll_on_main_thread() const {
    419     return should_scroll_on_main_thread_;
    420   }
    421 
    422   void SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
    423     have_wheel_event_handlers_ = have_wheel_event_handlers;
    424   }
    425   bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
    426 
    427   void SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
    428     have_scroll_event_handlers_ = have_scroll_event_handlers;
    429   }
    430   bool have_scroll_event_handlers() const {
    431     return have_scroll_event_handlers_;
    432   }
    433 
    434   void SetNonFastScrollableRegion(const Region& region) {
    435     non_fast_scrollable_region_ = region;
    436   }
    437   const Region& non_fast_scrollable_region() const {
    438     return non_fast_scrollable_region_;
    439   }
    440 
    441   void SetTouchEventHandlerRegion(const Region& region) {
    442     touch_event_handler_region_ = region;
    443   }
    444   const Region& touch_event_handler_region() const {
    445     return touch_event_handler_region_;
    446   }
    447 
    448   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
    449     draw_checkerboard_for_missing_tiles_ = checkerboard;
    450   }
    451   bool draw_checkerboard_for_missing_tiles() const {
    452     return draw_checkerboard_for_missing_tiles_;
    453   }
    454 
    455   InputHandler::ScrollStatus TryScroll(
    456       const gfx::PointF& screen_space_point,
    457       InputHandler::ScrollInputType type) const;
    458 
    459   void SetDoubleSided(bool double_sided);
    460   bool double_sided() const { return double_sided_; }
    461 
    462   void SetTransform(const gfx::Transform& transform);
    463   const gfx::Transform& transform() const { return transform_; }
    464   bool TransformIsAnimating() const;
    465   bool TransformIsAnimatingOnImplOnly() const;
    466   void SetTransformAndInvertibility(const gfx::Transform& transform,
    467                                     bool transform_is_invertible);
    468   bool transform_is_invertible() const { return transform_is_invertible_; }
    469 
    470   // Note this rect is in layer space (not content space).
    471   void SetUpdateRect(const gfx::RectF& update_rect);
    472 
    473   const gfx::RectF& update_rect() const { return update_rect_; }
    474 
    475   void AddDamageRect(const gfx::RectF& damage_rect);
    476 
    477   const gfx::RectF& damage_rect() const { return damage_rect_; }
    478 
    479   virtual base::DictionaryValue* LayerTreeAsJson() const;
    480 
    481   void SetStackingOrderChanged(bool stacking_order_changed);
    482 
    483   bool LayerPropertyChanged() const { return layer_property_changed_; }
    484 
    485   void ResetAllChangeTrackingForSubtree();
    486 
    487   LayerAnimationController* layer_animation_controller() {
    488     return layer_animation_controller_.get();
    489   }
    490 
    491   const LayerAnimationController* layer_animation_controller() const {
    492     return layer_animation_controller_.get();
    493   }
    494 
    495   virtual SimpleEnclosedRegion VisibleContentOpaqueRegion() const;
    496 
    497   virtual void DidBecomeActive();
    498 
    499   virtual void DidBeginTracing();
    500 
    501   // Release resources held by this layer. Called when the output surface
    502   // that rendered this layer was lost or a rendering mode switch has occured.
    503   virtual void ReleaseResources();
    504 
    505   ScrollbarAnimationController* scrollbar_animation_controller() const {
    506     return scrollbar_animation_controller_.get();
    507   }
    508 
    509   typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
    510   ScrollbarSet* scrollbars() { return scrollbars_.get(); }
    511   void ClearScrollbars();
    512   void AddScrollbar(ScrollbarLayerImplBase* layer);
    513   void RemoveScrollbar(ScrollbarLayerImplBase* layer);
    514   bool HasScrollbar(ScrollbarOrientation orientation) const;
    515   void ScrollbarParametersDidChange();
    516   int clip_height() {
    517     return scroll_clip_layer_ ? scroll_clip_layer_->bounds().height() : 0;
    518   }
    519 
    520   gfx::Rect LayerRectToContentRect(const gfx::RectF& layer_rect) const;
    521 
    522   virtual skia::RefPtr<SkPicture> GetPicture();
    523 
    524   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
    525   virtual void PushPropertiesTo(LayerImpl* layer);
    526 
    527   virtual void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
    528   virtual void AsValueInto(base::debug::TracedValue* dict) const;
    529 
    530   virtual size_t GPUMemoryUsageInBytes() const;
    531 
    532   void SetNeedsPushProperties();
    533   void AddDependentNeedsPushProperties();
    534   void RemoveDependentNeedsPushProperties();
    535   bool parent_should_know_need_push_properties() const {
    536     return needs_push_properties() || descendant_needs_push_properties();
    537   }
    538 
    539   bool needs_push_properties() const { return needs_push_properties_; }
    540   bool descendant_needs_push_properties() const {
    541     return num_dependents_need_push_properties_ > 0;
    542   }
    543 
    544   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark);
    545 
    546   virtual void SetDebugInfo(
    547       scoped_refptr<base::debug::ConvertableToTraceFormat> other);
    548 
    549   bool IsDrawnRenderSurfaceLayerListMember() const;
    550 
    551   void Set3dSortingContextId(int id);
    552   int sorting_context_id() { return sorting_context_id_; }
    553 
    554  protected:
    555   LayerImpl(LayerTreeImpl* layer_impl, int id);
    556 
    557   // Get the color and size of the layer's debug border.
    558   virtual void GetDebugBorderProperties(SkColor* color, float* width) const;
    559 
    560   void AppendDebugBorderQuad(RenderPass* render_pass,
    561                              const gfx::Size& content_bounds,
    562                              const SharedQuadState* shared_quad_state,
    563                              AppendQuadsData* append_quads_data) const;
    564   void AppendDebugBorderQuad(RenderPass* render_pass,
    565                              const gfx::Size& content_bounds,
    566                              const SharedQuadState* shared_quad_state,
    567                              AppendQuadsData* append_quads_data,
    568                              SkColor color,
    569                              float width) const;
    570 
    571   void NoteLayerPropertyChanged();
    572   void NoteLayerPropertyChangedForSubtree();
    573 
    574   // Note carefully this does not affect the current layer.
    575   void NoteLayerPropertyChangedForDescendants();
    576 
    577  private:
    578   void NoteLayerPropertyChangedForDescendantsInternal();
    579 
    580   virtual const char* LayerTypeAsString() const;
    581 
    582   // Properties internal to LayerImpl
    583   LayerImpl* parent_;
    584   OwnedLayerImplList children_;
    585 
    586   LayerImpl* scroll_parent_;
    587 
    588   // Storing a pointer to a set rather than a set since this will be rarely
    589   // used. If this pointer turns out to be too heavy, we could have this (and
    590   // the scroll parent above) be stored in a LayerImpl -> scroll_info
    591   // map somewhere.
    592   scoped_ptr<std::set<LayerImpl*> > scroll_children_;
    593 
    594   LayerImpl* clip_parent_;
    595   scoped_ptr<std::set<LayerImpl*> > clip_children_;
    596 
    597   // mask_layer_ can be temporarily stolen during tree sync, we need this ID to
    598   // confirm newly assigned layer is still the previous one
    599   int mask_layer_id_;
    600   scoped_ptr<LayerImpl> mask_layer_;
    601   int replica_layer_id_;  // ditto
    602   scoped_ptr<LayerImpl> replica_layer_;
    603   int layer_id_;
    604   LayerTreeImpl* layer_tree_impl_;
    605 
    606   // Properties synchronized from the associated Layer.
    607   gfx::Point3F transform_origin_;
    608   gfx::Size bounds_;
    609   gfx::Vector2dF bounds_delta_;
    610   gfx::Vector2d scroll_offset_;
    611   ScrollOffsetDelegate* scroll_offset_delegate_;
    612   LayerImpl* scroll_clip_layer_;
    613   bool scrollable_ : 1;
    614   bool should_scroll_on_main_thread_ : 1;
    615   bool have_wheel_event_handlers_ : 1;
    616   bool have_scroll_event_handlers_ : 1;
    617   bool user_scrollable_horizontal_ : 1;
    618   bool user_scrollable_vertical_ : 1;
    619   bool stacking_order_changed_ : 1;
    620   // Whether the "back" of this layer should draw.
    621   bool double_sided_ : 1;
    622   bool should_flatten_transform_ : 1;
    623 
    624   // Tracks if drawing-related properties have changed since last redraw.
    625   bool layer_property_changed_ : 1;
    626 
    627   bool masks_to_bounds_ : 1;
    628   bool contents_opaque_ : 1;
    629   bool is_root_for_isolated_group_ : 1;
    630   bool use_parent_backface_visibility_ : 1;
    631   bool draw_checkerboard_for_missing_tiles_ : 1;
    632   bool draws_content_ : 1;
    633   bool hide_layer_and_subtree_ : 1;
    634   bool force_render_surface_ : 1;
    635 
    636   // Cache transform_'s invertibility.
    637   bool transform_is_invertible_ : 1;
    638 
    639   // Set for the layer that other layers are fixed to.
    640   bool is_container_for_fixed_position_layers_ : 1;
    641   Region non_fast_scrollable_region_;
    642   Region touch_event_handler_region_;
    643   SkColor background_color_;
    644 
    645   float opacity_;
    646   SkXfermode::Mode blend_mode_;
    647   gfx::PointF position_;
    648   gfx::Transform transform_;
    649 
    650   LayerPositionConstraint position_constraint_;
    651 
    652   gfx::Vector2dF scroll_delta_;
    653   gfx::Vector2d sent_scroll_delta_;
    654   gfx::Vector2dF last_scroll_offset_;
    655 
    656   int num_descendants_that_draw_content_;
    657 
    658   // The global depth value of the center of the layer. This value is used
    659   // to sort layers from back to front.
    660   float draw_depth_;
    661 
    662   FilterOperations filters_;
    663   FilterOperations background_filters_;
    664 
    665  protected:
    666   friend class TreeSynchronizer;
    667 
    668   // This flag is set when the layer needs to push properties to the active
    669   // side.
    670   bool needs_push_properties_;
    671 
    672   // The number of direct children or dependent layers that need to be recursed
    673   // to in order for them or a descendent of them to push properties to the
    674   // active side.
    675   int num_dependents_need_push_properties_;
    676 
    677   // Layers that share a sorting context id will be sorted together in 3d
    678   // space.  0 is a special value that means this layer will not be sorted and
    679   // will be drawn in paint order.
    680   int sorting_context_id_;
    681 
    682   DrawMode current_draw_mode_;
    683 
    684  private:
    685   // Rect indicating what was repainted/updated during update.
    686   // Note that plugin layers bypass this and leave it empty.
    687   // Uses layer (not content) space.
    688   gfx::RectF update_rect_;
    689 
    690   // This rect is in layer space.
    691   gfx::RectF damage_rect_;
    692 
    693   // Manages animations for this layer.
    694   scoped_refptr<LayerAnimationController> layer_animation_controller_;
    695 
    696   // Manages scrollbars for this layer
    697   scoped_ptr<ScrollbarAnimationController> scrollbar_animation_controller_;
    698 
    699   scoped_ptr<ScrollbarSet> scrollbars_;
    700 
    701   ScopedPtrVector<CopyOutputRequest> copy_requests_;
    702 
    703   // Group of properties that need to be computed based on the layer tree
    704   // hierarchy before layers can be drawn.
    705   DrawProperties<LayerImpl> draw_properties_;
    706 
    707   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
    708 
    709   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
    710 };
    711 
    712 }  // namespace cc
    713 
    714 #endif  // CC_LAYERS_LAYER_IMPL_H_
    715