1 files changed, 124 insertions, 0 deletions
diff --git a/dom/animation/PendingAnimationTracker.cpp b/dom/animation/PendingAnimationTracker.cpp
new file mode 100644
index 000000000..a97814a7c
--- /dev/null
+++ b/dom/animation/PendingAnimationTracker.cpp
@@ -0,0 +1,124 @@
+/* -*- 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/. */
+
+#include "PendingAnimationTracker.h"
+
+#include "mozilla/dom/AnimationTimeline.h"
+#include "nsIFrame.h"
+#include "nsIPresShell.h"
+
+using namespace mozilla;
+
+namespace mozilla {
+
+NS_IMPL_CYCLE_COLLECTION(PendingAnimationTracker,
+                         mPlayPendingSet,
+                         mPausePendingSet,
+                         mDocument)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PendingAnimationTracker, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PendingAnimationTracker, Release)
+
+void
+PendingAnimationTracker::AddPending(dom::Animation& aAnimation,
+                                    AnimationSet& aSet)
+{
+  aSet.PutEntry(&aAnimation);
+
+  // Schedule a paint. Otherwise animations that don't trigger a paint by
+  // themselves (e.g. CSS animations with an empty keyframes rule) won't
+  // start until something else paints.
+  EnsurePaintIsScheduled();
+}
+
+void
+PendingAnimationTracker::RemovePending(dom::Animation& aAnimation,
+                                       AnimationSet& aSet)
+{
+  aSet.RemoveEntry(&aAnimation);
+}
+
+bool
+PendingAnimationTracker::IsWaiting(const dom::Animation& aAnimation,
+                                   const AnimationSet& aSet) const
+{
+  return aSet.Contains(const_cast<dom::Animation*>(&aAnimation));
+}
+
+void
+PendingAnimationTracker::TriggerPendingAnimationsOnNextTick(const TimeStamp&
+                                                        aReadyTime)
+{
+  auto triggerAnimationsAtReadyTime = [aReadyTime](AnimationSet& aAnimationSet)
+  {
+    for (auto iter = aAnimationSet.Iter(); !iter.Done(); iter.Next()) {
+      dom::Animation* animation = iter.Get()->GetKey();
+      dom::AnimationTimeline* timeline = animation->GetTimeline();
+
+      // If the animation does not have a timeline, just drop it from the map.
+      // The animation will detect that it is not being tracked and will trigger
+      // itself on the next tick where it has a timeline.
+      if (!timeline) {
+        iter.Remove();
+        continue;
+      }
+
+      // When the timeline's refresh driver is under test control, its values
+      // have no correspondance to wallclock times so we shouldn't try to
+      // convert aReadyTime (which is a wallclock time) to a timeline value.
+      // Instead, the animation will be started/paused when the refresh driver
+      // is next advanced since this will trigger a call to
+      // TriggerPendingAnimationsNow.
+      if (!timeline->TracksWallclockTime()) {
+        continue;
+      }
+
+      Nullable<TimeDuration> readyTime = timeline->ToTimelineTime(aReadyTime);
+      animation->TriggerOnNextTick(readyTime);
+
+      iter.Remove();
+    }
+  };
+
+  triggerAnimationsAtReadyTime(mPlayPendingSet);
+  triggerAnimationsAtReadyTime(mPausePendingSet);
+}
+
+void
+PendingAnimationTracker::TriggerPendingAnimationsNow()
+{
+  auto triggerAndClearAnimations = [](AnimationSet& aAnimationSet) {
+    for (auto iter = aAnimationSet.Iter(); !iter.Done(); iter.Next()) {
+      iter.Get()->GetKey()->TriggerNow();
+    }
+    aAnimationSet.Clear();
+  };
+
+  triggerAndClearAnimations(mPlayPendingSet);
+  triggerAndClearAnimations(mPausePendingSet);
+}
+
+void
+PendingAnimationTracker::EnsurePaintIsScheduled()
+{
+  if (!mDocument) {
+    return;
+  }
+
+  nsIPresShell* presShell = mDocument->GetShell();
+  if (!presShell) {
+    return;
+  }
+
+  nsIFrame* rootFrame = presShell->GetRootFrame();
+  if (!rootFrame) {
+    return;
+  }
+
+  rootFrame->SchedulePaint();
+}
+
+} // namespace mozilla