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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_ComputedTimingFunction_h
#define mozilla_ComputedTimingFunction_h

#include "nsSMILKeySpline.h"  // nsSMILKeySpline
#include "nsStyleStruct.h"    // nsTimingFunction

namespace mozilla {

class ComputedTimingFunction
{
public:
  // BeforeFlag is used in step timing function.
  // https://w3c.github.io/web-animations/#before-flag
  enum class BeforeFlag {
    Unset,
    Set
  };
  void Init(const nsTimingFunction &aFunction);
  double GetValue(double aPortion, BeforeFlag aBeforeFlag) const;
  const nsSMILKeySpline* GetFunction() const
  {
    NS_ASSERTION(HasSpline(), "Type mismatch");
    return &mTimingFunction;
  }
  nsTimingFunction::Type GetType() const { return mType; }
  bool HasSpline() const { return nsTimingFunction::IsSplineType(mType); }
  uint32_t GetSteps() const { return mSteps; }
  bool operator==(const ComputedTimingFunction& aOther) const
  {
    return mType == aOther.mType &&
           (HasSpline() ?
            mTimingFunction == aOther.mTimingFunction :
            mSteps == aOther.mSteps);
  }
  bool operator!=(const ComputedTimingFunction& aOther) const
  {
    return !(*this == aOther);
  }
  int32_t Compare(const ComputedTimingFunction& aRhs) const;
  void AppendToString(nsAString& aResult) const;

  static double GetPortion(const Maybe<ComputedTimingFunction>& aFunction,
                           double aPortion,
                           BeforeFlag aBeforeFlag)
  {
    return aFunction ? aFunction->GetValue(aPortion, aBeforeFlag) : aPortion;
  }
  static int32_t Compare(const Maybe<ComputedTimingFunction>& aLhs,
                         const Maybe<ComputedTimingFunction>& aRhs);

private:
  nsTimingFunction::Type mType;
  nsSMILKeySpline mTimingFunction;
  uint32_t mSteps;
};

} // namespace mozilla

#endif // mozilla_ComputedTimingFunction_h