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diff --git a/dom/animation/ComputedTiming.h b/dom/animation/ComputedTiming.h
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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/. */
+
+#ifndef mozilla_ComputedTiming_h
+#define mozilla_ComputedTiming_h
+
+#include "mozilla/dom/Nullable.h"
+#include "mozilla/StickyTimeDuration.h"
+#include "mozilla/ComputedTimingFunction.h"
+
+// X11 has a #define for None
+#ifdef None
+#undef None
+#endif
+#include "mozilla/dom/AnimationEffectReadOnlyBinding.h" // FillMode
+
+namespace mozilla {
+
+/**
+ * Stores the results of calculating the timing properties of an animation
+ * at a given sample time.
+ */
+struct ComputedTiming
+{
+ // The total duration of the animation including all iterations.
+ // Will equal StickyTimeDuration::Forever() if the animation repeats
+ // indefinitely.
+ StickyTimeDuration mActiveDuration;
+ // The effect end time in local time (i.e. an offset from the effect's
+ // start time). Will equal StickyTimeDuration::Forever() if the animation
+ // plays indefinitely.
+ StickyTimeDuration mEndTime;
+ // Progress towards the end of the current iteration. If the effect is
+ // being sampled backwards, this will go from 1.0 to 0.0.
+ // Will be null if the animation is neither animating nor
+ // filling at the sampled time.
+ Nullable<double> mProgress;
+ // Zero-based iteration index (meaningless if mProgress is null).
+ uint64_t mCurrentIteration = 0;
+ // Unlike TimingParams::mIterations, this value is
+ // guaranteed to be in the range [0, Infinity].
+ double mIterations = 1.0;
+ double mIterationStart = 0.0;
+ StickyTimeDuration mDuration;
+
+ // This is the computed fill mode so it is never auto
+ dom::FillMode mFill = dom::FillMode::None;
+ bool FillsForwards() const {
+ MOZ_ASSERT(mFill != dom::FillMode::Auto,
+ "mFill should not be Auto in ComputedTiming.");
+ return mFill == dom::FillMode::Both ||
+ mFill == dom::FillMode::Forwards;
+ }
+ bool FillsBackwards() const {
+ MOZ_ASSERT(mFill != dom::FillMode::Auto,
+ "mFill should not be Auto in ComputedTiming.");
+ return mFill == dom::FillMode::Both ||
+ mFill == dom::FillMode::Backwards;
+ }
+
+ enum class AnimationPhase {
+ Null, // Not sampled (null sample time)
+ Before, // Sampled prior to the start of the active interval
+ Active, // Sampled within the active interval
+ After // Sampled after (or at) the end of the active interval
+ };
+ AnimationPhase mPhase = AnimationPhase::Null;
+
+ ComputedTimingFunction::BeforeFlag mBeforeFlag =
+ ComputedTimingFunction::BeforeFlag::Unset;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_ComputedTiming_h