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-rw-r--r--dom/animation/ScrollTimelineAnimationTracker.cpp48
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diff --git a/dom/animation/ScrollTimelineAnimationTracker.cpp b/dom/animation/ScrollTimelineAnimationTracker.cpp
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+/* -*- 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 "ScrollTimelineAnimationTracker.h"
+
+#include "mozilla/dom/Document.h"
+
+namespace mozilla {
+
+NS_IMPL_CYCLE_COLLECTION(ScrollTimelineAnimationTracker, mPendingSet, mDocument)
+
+void ScrollTimelineAnimationTracker::TriggerPendingAnimations() {
+ for (auto iter = mPendingSet.begin(), end = mPendingSet.end(); iter != end;
+ ++iter) {
+ dom::Animation* animation = *iter;
+
+ MOZ_ASSERT(animation->GetTimeline() &&
+ !animation->GetTimeline()->IsMonotonicallyIncreasing());
+
+ // FIXME: Trigger now may not be correct because the spec says:
+ // If a user agent determines that animation is immediately ready, it may
+ // schedule the task (i.e. ResumeAt()) as a microtask such that it runs at
+ // the next microtask checkpoint, but it must not perform the task
+ // synchronously.
+ // Note: So, for now, we put the animation into the tracker, and trigger
+ // them immediately until the frames are ready. Using TriggerOnNextTick()
+ // for scroll-driven animations may have issues because we don't tick if
+ // no one does scroll.
+ if (!animation->TryTriggerNow()) {
+ // Note: We keep this animation pending even if its timeline is always
+ // inactive. It's pretty hard to tell its future status, for example, it's
+ // possible that the scroll container is in display:none subtree but the
+ // animating element isn't the subtree, then we need to keep tracking the
+ // situation until the scroll container gets framed. so in general we make
+ // this animation be pending (i.e. not ready) if its scroll-timeline is
+ // inactive, and this also matches the current spec definition.
+ continue;
+ }
+
+ // Note: Remove() is legitimately called once per entry during the loop.
+ mPendingSet.Remove(iter);
+ }
+}
+
+} // namespace mozilla