1 files changed, 84 insertions, 0 deletions
diff --git a/dom/animation/PendingAnimationTracker.h b/dom/animation/PendingAnimationTracker.h
new file mode 100644
index 000000000..8d638c73f
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+++ b/dom/animation/PendingAnimationTracker.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_PendingAnimationTracker_h
+#define mozilla_dom_PendingAnimationTracker_h
+
+#include "mozilla/dom/Animation.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIDocument.h"
+#include "nsTHashtable.h"
+
+class nsIFrame;
+
+namespace mozilla {
+
+class PendingAnimationTracker final
+{
+public:
+  explicit PendingAnimationTracker(nsIDocument* aDocument)
+    : mDocument(aDocument)
+  { }
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(PendingAnimationTracker)
+  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(PendingAnimationTracker)
+
+  void AddPlayPending(dom::Animation& aAnimation)
+  {
+    MOZ_ASSERT(!IsWaitingToPause(aAnimation),
+               "Animation is already waiting to pause");
+    AddPending(aAnimation, mPlayPendingSet);
+  }
+  void RemovePlayPending(dom::Animation& aAnimation)
+  {
+    RemovePending(aAnimation, mPlayPendingSet);
+  }
+  bool IsWaitingToPlay(const dom::Animation& aAnimation) const
+  {
+    return IsWaiting(aAnimation, mPlayPendingSet);
+  }
+
+  void AddPausePending(dom::Animation& aAnimation)
+  {
+    MOZ_ASSERT(!IsWaitingToPlay(aAnimation),
+               "Animation is already waiting to play");
+    AddPending(aAnimation, mPausePendingSet);
+  }
+  void RemovePausePending(dom::Animation& aAnimation)
+  {
+    RemovePending(aAnimation, mPausePendingSet);
+  }
+  bool IsWaitingToPause(const dom::Animation& aAnimation) const
+  {
+    return IsWaiting(aAnimation, mPausePendingSet);
+  }
+
+  void TriggerPendingAnimationsOnNextTick(const TimeStamp& aReadyTime);
+  void TriggerPendingAnimationsNow();
+  bool HasPendingAnimations() const {
+    return mPlayPendingSet.Count() > 0 || mPausePendingSet.Count() > 0;
+  }
+
+private:
+  ~PendingAnimationTracker() { }
+
+  void EnsurePaintIsScheduled();
+
+  typedef nsTHashtable<nsRefPtrHashKey<dom::Animation>> AnimationSet;
+
+  void AddPending(dom::Animation& aAnimation, AnimationSet& aSet);
+  void RemovePending(dom::Animation& aAnimation, AnimationSet& aSet);
+  bool IsWaiting(const dom::Animation& aAnimation,
+                 const AnimationSet& aSet) const;
+
+  AnimationSet mPlayPendingSet;
+  AnimationSet mPausePendingSet;
+  nsCOMPtr<nsIDocument> mDocument;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_dom_PendingAnimationTracker_h