gecko-dev/dom/animation/AnimationUtils.h

/* -*- 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_AnimationUtils_h
#define mozilla_dom_AnimationUtils_h

#include "mozilla/TimeStamp.h"
#include "mozilla/dom/Nullable.h"
#include "nsStringFwd.h"

class nsIContent;

namespace mozilla {

class ComputedTimingFunction;

namespace dom {
class Element;
}

class AnimationUtils
{
public:
  static dom::Nullable<double>
    TimeDurationToDouble(const dom::Nullable<TimeDuration>& aTime)
  {
    dom::Nullable<double> result;

    if (!aTime.IsNull()) {
      result.SetValue(aTime.Value().ToMilliseconds());
    }

    return result;
  }

  static dom::Nullable<TimeDuration>
    DoubleToTimeDuration(const dom::Nullable<double>& aTime)
  {
    dom::Nullable<TimeDuration> result;

    if (!aTime.IsNull()) {
      result.SetValue(TimeDuration::FromMilliseconds(aTime.Value()));
    }

    return result;
  }

  static void LogAsyncAnimationFailure(nsCString& aMessage,
                                       const nsIContent* aContent = nullptr);

  /**
   * Parses a CSS <single-transition-timing-function> value from
   * aEasing into a ComputedTimingFunction.  If parsing fails, Nothing() will
   * be returned.
   */
  static Maybe<ComputedTimingFunction>
    ParseEasing(const dom::Element* aTarget, const nsAString& aEasing);
};

} // namespace mozilla

#endif