Initial implementation of WorkletAnimation

third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WorkletAnimation_h
+#define WorkletAnimation_h
+
+#include "bindings/core/v8/serialization/SerializedScriptValue.h"
+#include "bindings/modules/v8/DocumentTimelineOrScrollTimeline.h"
+#include "core/animation/KeyframeEffectReadOnly.h"
+#include "core/animation/WorkletAnimationBase.h"
+#include "modules/ModulesExport.h"
+#include "platform/animation/CompositorAnimationDelegate.h"
+#include "platform/animation/CompositorAnimationPlayerClient.h"
+#include "platform/bindings/ScriptWrappable.h"
+
+namespace blink {
+
+class MODULES_EXPORT WorkletAnimation : public WorkletAnimationBase,
+                                        public ScriptWrappable,
+                                        public CompositorAnimationPlayerClient,
+                                        public CompositorAnimationDelegate {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  enum AnimationPlayState {
+    kIdle,
+    kPending,
+    kRunning,
+  };
+
+  static WorkletAnimation* Create(
+      String animator_name,
+      const HeapVector<Member<KeyframeEffectReadOnly>>&,
+      HeapVector<DocumentTimelineOrScrollTimeline>&,
+      RefPtr<SerializedScriptValue>,
+      ExceptionState&);
+
+  virtual ~WorkletAnimation() {}
+
+  String playState();
+  void play();
+  void cancel();
+
+  // WorkletAnimationBase implementation.
+  bool StartOnCompositor() override;
+
+  // CompositorAnimationPlayerClient implementation.
+  CompositorAnimationPlayer* CompositorPlayer() const override {
+    return compositor_player_ ? compositor_player_->Player() : nullptr;
+  }
+
+  // CompositorAnimationDelegate implementation.
+  void NotifyAnimationStarted(double monotonic_time, int group) override {}
+  void NotifyAnimationFinished(double monotonic_time, int group) override {}
+  void NotifyAnimationAborted(double monotonic_time, int group) override {}
+
+  void Dispose();
+
+  String Name() { return animator_name_; }
+
+  const HeapVector<DocumentTimelineOrScrollTimeline>& Timelines() {
+    return timelines_;
+  }
+
+  const RefPtr<SerializedScriptValue> Options() { return options_; }
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  WorkletAnimation(String animator_name,
+                   Document&,
+                   const HeapVector<Member<KeyframeEffectReadOnly>>&,
+                   HeapVector<DocumentTimelineOrScrollTimeline>&,
+                   RefPtr<SerializedScriptValue>);
+
+  // TODO(smcgruer): This pattern was copied from Animation.h. Document why we
+  // do this, or remove the layer of indirection.

[flackr, 2017/07/19 19:23:48]

I'm thinking we should not copy this pattern unless / until we find a reason to
need to do so.

[smcgruer, 2017/07/24 14:48:58]

Done.

+  class CompositorAnimationPlayerHolder
+      : public GarbageCollectedFinalized<CompositorAnimationPlayerHolder> {
+    USING_PRE_FINALIZER(CompositorAnimationPlayerHolder, Dispose);
+
+   public:
+    static CompositorAnimationPlayerHolder* Create(WorkletAnimation*);
+
+    void Detach();
+
+    DEFINE_INLINE_TRACE() { visitor->Trace(animation_); }
+
+    CompositorAnimationPlayer* Player() const {
+      return compositor_player_.get();
+    }
+
+   private:
+    explicit CompositorAnimationPlayerHolder(WorkletAnimation*);
+
+    void Dispose();
+
+    std::unique_ptr<CompositorAnimationPlayer> compositor_player_;
+    Member<WorkletAnimation> animation_;
+  };
+
+  String animator_name_;
+  AnimationPlayState play_state_;
+
+  Member<Document> document_;
+
+  HeapVector<Member<KeyframeEffectReadOnly>> effects_;
+  HeapVector<DocumentTimelineOrScrollTimeline> timelines_;
+  RefPtr<SerializedScriptValue> options_;
+
+  Member<CompositorAnimationPlayerHolder> compositor_player_;
+};
+
+}  // namespace blink
+
+#endif