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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