CC Animation: Merge LayerAnimationController into ElementAnimations.

cc/animation/element_animations.h

Index: cc/animation/element_animations.h
diff --git a/cc/animation/element_animations.h b/cc/animation/element_animations.h
index 4214f317ba401705ab8b371fdf2071cfd08bd6fd..51d3eb25a983587e70b7c59e436672e39f186477 100644
--- a/cc/animation/element_animations.h
+++ b/cc/animation/element_animations.h
@@ -5,66 +5,60 @@
 #ifndef CC_ANIMATION_ELEMENT_ANIMATIONS_H_
 #define CC_ANIMATION_ELEMENT_ANIMATIONS_H_
 
+#include <bitset>
 #include <memory>
+#include <vector>
 
 #include "base/containers/linked_list.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "cc/animation/animation.h"
 #include "cc/animation/animation_curve.h"
-#include "cc/animation/animation_delegate.h"
-#include "cc/animation/layer_animation_controller.h"
-#include "cc/animation/layer_animation_value_observer.h"
-#include "cc/animation/layer_animation_value_provider.h"
+#include "cc/animation/animation_events.h"
+#include "cc/animation/target_property.h"
 #include "cc/base/cc_export.h"
+#include "ui/gfx/geometry/scroll_offset.h"
+#include "ui/gfx/transform.h"
 
 namespace gfx {
-class ScrollOffset;
-class Transform;
+class BoxF;
 }
 
 namespace cc {
 
+class AnimationDelegate;
+class AnimationEvents;
 class AnimationHost;
 class AnimationPlayer;
 class FilterOperations;
-class LayerAnimationController;
+class KeyframeValueList;
 enum class LayerTreeType;
 
 // An ElementAnimations owns a list of all AnimationPlayers, attached to
-// the layer. Also, it owns LayerAnimationController instance (1:1
-// relationship)
-// ElementAnimations object redirects all events from LAC to the list
-// of animation layers.
+// the layer.
 // This is a CC counterpart for blink::ElementAnimations (in 1:1 relationship).
 // No pointer to/from respective blink::ElementAnimations object for now.
-class CC_EXPORT ElementAnimations : public base::RefCounted<ElementAnimations>,
-                                    public AnimationDelegate,
-                                    public LayerAnimationValueObserver,
-                                    public LayerAnimationValueProvider {
+class CC_EXPORT ElementAnimations : public base::RefCounted<ElementAnimations> {
  public:
-  static scoped_refptr<ElementAnimations> Create(AnimationHost* host);
+  enum class ObserverType { ACTIVE, PENDING };
 
-  int layer_id() const {
-    return layer_animation_controller_ ? layer_animation_controller_->id() : 0;
-  }
+  static scoped_refptr<ElementAnimations> Create();
+
+  int layer_id() const { return layer_id_; }
+  void SetLayerId(int layer_id);
 
   // Parent AnimationHost.
   AnimationHost* animation_host() { return animation_host_; }
   const AnimationHost* animation_host() const { return animation_host_; }
+  void SetAnimationHost(AnimationHost* host);
 
-  void CreateLayerAnimationController(int layer_id);
-  void DestroyLayerAnimationController();
+  void InitValueObservations();
+  void ClearValueObservations();
 
   void LayerRegistered(int layer_id, LayerTreeType tree_type);
   void LayerUnregistered(int layer_id, LayerTreeType tree_type);
 
-  bool needs_active_value_observations() const {
-    return layer_animation_controller_->needs_active_value_observations();
-  }
-  bool needs_pending_value_observations() const {
-    return layer_animation_controller_->needs_pending_value_observations();
-  }
-
   void AddPlayer(AnimationPlayer* player);
   void RemovePlayer(AnimationPlayer* player);
   bool IsEmpty() const;
@@ -73,6 +67,9 @@ class CC_EXPORT ElementAnimations : public base::RefCounted<ElementAnimations>,
   typedef base::LinkNode<AnimationPlayer> PlayersListNode;
   const PlayersList& players_list() const { return *players_list_.get(); }
 
+  // Ensures that the list of active animations on the main thread and the impl
+  // thread are kept in sync. This function does not take ownership of the impl
+  // thread ElementAnimations.
   void PushPropertiesTo(
       scoped_refptr<ElementAnimations> element_animations_impl);
 
@@ -83,6 +80,17 @@ class CC_EXPORT ElementAnimations : public base::RefCounted<ElementAnimations>,
   void AbortAnimations(TargetProperty::Type target_property,
                        bool needs_completion = false);
 
+  void Animate(base::TimeTicks monotonic_time);
+  void AccumulatePropertyUpdates(base::TimeTicks monotonic_time,
+                                 AnimationEvents* events);
+
+  void UpdateState(bool start_ready_animations, AnimationEvents* events);
+
+  // Make animations affect active observers if and only if they affect
+  // pending observers. Any animations that no longer affect any observers
+  // are deleted.
+  void ActivateAnimations();
+
   // Returns the active animation animating the given property that is either
   // running, or is next to run, if such an animation exists.
   Animation* GetAnimation(TargetProperty::Type target_property) const;
@@ -90,56 +98,191 @@ class CC_EXPORT ElementAnimations : public base::RefCounted<ElementAnimations>,
   // Returns the active animation for the given unique animation id.
   Animation* GetAnimationById(int animation_id) const;
 
+  // Returns true if there are any animations that have neither finished nor
+  // aborted.
+  bool HasActiveAnimation() const;
+
+  // Returns true if there are any animations at all to process.
+  bool has_any_animation() const { return !animations_.empty(); }
+
+  // Returns true if there is an animation that is either currently animating
+  // the given property or scheduled to animate this property in the future, and
+  // that affects the given observer type.
+  bool IsPotentiallyAnimatingProperty(TargetProperty::Type target_property,
+                                      ObserverType observer_type) const;
+
+  // Returns true if there is an animation that is currently animating the given
+  // property and that affects the given observer type.
+  bool IsCurrentlyAnimatingProperty(TargetProperty::Type target_property,
+                                    ObserverType observer_type) const;
+
+  void NotifyAnimationStarted(const AnimationEvent& event);
+  void NotifyAnimationFinished(const AnimationEvent& event);
+  void NotifyAnimationAborted(const AnimationEvent& event);
+  void NotifyAnimationPropertyUpdate(const AnimationEvent& event);
+  void NotifyAnimationTakeover(const AnimationEvent& event);
+
+  bool needs_active_value_observations() const {
+    return needs_active_value_observations_;
+  }
+  bool needs_pending_value_observations() const {
+    return needs_pending_value_observations_;
+  }
+
+  void set_needs_active_value_observations(
+      bool needs_active_value_observations) {
+    needs_active_value_observations_ = needs_active_value_observations;
+  }
+  void set_needs_pending_value_observations(
+      bool needs_pending_value_observations) {
+    needs_pending_value_observations_ = needs_pending_value_observations;
+  }
+
+  bool HasFilterAnimationThatInflatesBounds() const;
+  bool HasTransformAnimationThatInflatesBounds() const;
+  bool HasAnimationThatInflatesBounds() const {
+    return HasTransformAnimationThatInflatesBounds() ||
+           HasFilterAnimationThatInflatesBounds();
+  }
+
+  bool FilterAnimationBoundsForBox(const gfx::BoxF& box,
+                                   gfx::BoxF* bounds) const;
+  bool TransformAnimationBoundsForBox(const gfx::BoxF& box,
+                                      gfx::BoxF* bounds) const;
+
+  bool HasAnimationThatAffectsScale() const;
+
+  bool HasOnlyTranslationTransforms(ObserverType observer_type) const;
+
+  bool AnimationsPreserveAxisAlignment() const;
+
+  // Sets |start_scale| to the maximum of starting animation scale along any
+  // dimension at any destination in active animations. Returns false if the
+  // starting scale cannot be computed.
+  bool AnimationStartScale(ObserverType observer_type,
+                           float* start_scale) const;
+
+  // Sets |max_scale| to the maximum scale along any dimension at any
+  // destination in active animations. Returns false if the maximum scale cannot
+  // be computed.
+  bool MaximumTargetScale(ObserverType observer_type, float* max_scale) const;
+
+  // When a scroll animation is removed on the main thread, its compositor
+  // thread counterpart continues producing scroll deltas until activation.
+  // These scroll deltas need to be cleared at activation, so that the active
+  // layer's scroll offset matches the offset provided by the main thread
+  // rather than a combination of this offset and scroll deltas produced by
+  // the removed animation. This is to provide the illusion of synchronicity to
+  // JS that simultaneously removes an animation and sets the scroll offset.
+  bool scroll_offset_animation_was_interrupted() const {
+    return scroll_offset_animation_was_interrupted_;
+  }
+
+  bool needs_to_start_animations_for_testing() {
+    return needs_to_start_animations_;
+  }
+
  private:
   friend class base::RefCounted<ElementAnimations>;
 
-  // TODO(loyso): Erase this when LAC merged into ElementAnimations.
-  friend class AnimationHost;
+  ElementAnimations();
+  ~ElementAnimations();
+
+  // A set of target properties. TargetProperty must be 0-based enum.
+  using TargetProperties =
+      std::bitset<TargetProperty::LAST_TARGET_PROPERTY + 1>;
+
+  void PushNewAnimationsToImplThread(
+      ElementAnimations* element_animations_impl) const;
+  void MarkAbortedAnimationsForDeletion(
+      ElementAnimations* element_animations_impl) const;
+  void RemoveAnimationsCompletedOnMainThread(
+      ElementAnimations* element_animations_impl) const;
+  void PushPropertiesToImplThread(ElementAnimations* element_animations_impl);
+
+  void StartAnimations(base::TimeTicks monotonic_time);
+  void PromoteStartedAnimations(base::TimeTicks monotonic_time,
+                                AnimationEvents* events);
+  void MarkFinishedAnimations(base::TimeTicks monotonic_time);
+  void MarkAnimationsForDeletion(base::TimeTicks monotonic_time,
+                                 AnimationEvents* events);
+  void PurgeAnimationsMarkedForDeletion();
+
+  void TickAnimations(base::TimeTicks monotonic_time);
 
-  explicit ElementAnimations(AnimationHost* host);
-  ~ElementAnimations() override;
+  enum UpdateActivationType { NORMAL_ACTIVATION, FORCE_ACTIVATION };
+  void UpdateActivation(UpdateActivationType type);
+
+  void NotifyObserversOpacityAnimated(float opacity,
+                                      bool notify_active_observers,
+                                      bool notify_pending_observers);
+  void NotifyObserversTransformAnimated(const gfx::Transform& transform,
+                                        bool notify_active_observers,
+                                        bool notify_pending_observers);
+  void NotifyObserversFilterAnimated(const FilterOperations& filter,
+                                     bool notify_active_observers,
+                                     bool notify_pending_observers);
+  void NotifyObserversScrollOffsetAnimated(
+      const gfx::ScrollOffset& scroll_offset,
+      bool notify_active_observers,
+      bool notify_pending_observers);
+
+  void NotifyObserversAnimationWaitingForDeletion();
+
+  void NotifyObserversTransformIsPotentiallyAnimatingChanged(
+      bool notify_active_observers,
+      bool notify_pending_observers);
+
+  void UpdatePotentiallyAnimatingTransform();
 
-  // LayerAnimationValueObserver implementation.
   void OnFilterAnimated(LayerTreeType tree_type,
-                        const FilterOperations& filters) override;
-  void OnOpacityAnimated(LayerTreeType tree_type, float opacity) override;
+                        const FilterOperations& filters);
+  void OnOpacityAnimated(LayerTreeType tree_type, float opacity);
   void OnTransformAnimated(LayerTreeType tree_type,
-                           const gfx::Transform& transform) override;
+                           const gfx::Transform& transform);
   void OnScrollOffsetAnimated(LayerTreeType tree_type,
-                              const gfx::ScrollOffset& scroll_offset) override;
-  void OnAnimationWaitingForDeletion() override;
+                              const gfx::ScrollOffset& scroll_offset);
+  void OnAnimationWaitingForDeletion();
   void OnTransformIsPotentiallyAnimatingChanged(LayerTreeType tree_type,
-                                                bool is_animating) override;
-
-  void CreateActiveValueObserver();
-  void DestroyActiveValueObserver();
-
-  void CreatePendingValueObserver();
-  void DestroyPendingValueObserver();
-
-  // AnimationDelegate implementation
-  void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              TargetProperty::Type target_property,
-                              int group) override;
-  void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               TargetProperty::Type target_property,
-                               int group) override;
-  void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              TargetProperty::Type target_property,
-                              int group) override;
-  void NotifyAnimationTakeover(base::TimeTicks monotonic_time,
-                               TargetProperty::Type target_property,
-                               double animation_start_time,
-                               std::unique_ptr<AnimationCurve> curve) override;
-
-  // LayerAnimationValueProvider implementation.
-  gfx::ScrollOffset ScrollOffsetForAnimation() const override;
+                                                bool is_animating);
+  gfx::ScrollOffset ScrollOffsetForAnimation() const;
 
-  std::unique_ptr<PlayersList> players_list_;
+  void NotifyPlayersAnimationStarted(base::TimeTicks monotonic_time,
+                                     TargetProperty::Type target_property,
+                                     int group);
+  void NotifyPlayersAnimationFinished(base::TimeTicks monotonic_time,
+                                      TargetProperty::Type target_property,
+                                      int group);
+  void NotifyPlayersAnimationAborted(base::TimeTicks monotonic_time,
+                                     TargetProperty::Type target_property,
+                                     int group);
+  void NotifyPlayersAnimationPropertyUpdate(const AnimationEvent& event);
+  void NotifyPlayersAnimationTakeover(base::TimeTicks monotonic_time,
+                                      TargetProperty::Type target_property,
+                                      double animation_start_time,
+                                      std::unique_ptr<AnimationCurve> curve);
 
-  // LAC is owned by ElementAnimations (1:1 relationship).
-  scoped_refptr<LayerAnimationController> layer_animation_controller_;
+  std::unique_ptr<PlayersList> players_list_;
   AnimationHost* animation_host_;
+  int layer_id_;
+  std::vector<std::unique_ptr<Animation>> animations_;
+
+  // This is used to ensure that we don't spam the animation host.
+  bool is_active_;
+
+  base::TimeTicks last_tick_time_;
+
+  bool needs_active_value_observations_;
+  bool needs_pending_value_observations_;
+
+  // Only try to start animations when new animations are added or when the
+  // previous attempt at starting animations failed to start all animations.
+  bool needs_to_start_animations_;
+
+  bool scroll_offset_animation_was_interrupted_;
+
+  bool potentially_animating_transform_for_active_observers_;
+  bool potentially_animating_transform_for_pending_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementAnimations);
 };