// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef InterpolationEffect_h
#define InterpolationEffect_h

#include "core/CoreExport.h"
#include "core/animation/Interpolation.h"
#include "core/animation/Keyframe.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/animation/TimingFunction.h"

namespace blink {

// Stores all adjacent pairs of keyframes (represented by Interpolations) in a
// KeyframeEffectModel with keyframe offset data preprocessed for more efficient
// active keyframe pair sampling.
class CORE_EXPORT InterpolationEffect {
  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();

 public:
  InterpolationEffect() : m_isPopulated(false) {}

  bool isPopulated() const { return m_isPopulated; }
  void setPopulated() { m_isPopulated = true; }

  void clear() {
    m_isPopulated = false;
    m_interpolations.clear();
  }

  void getActiveInterpolations(double fraction,
                               double iterationDuration,
                               Vector<RefPtr<Interpolation>>&) const;

  void addInterpolation(PassRefPtr<Interpolation> interpolation,
                        PassRefPtr<TimingFunction> easing,
                        double start,
                        double end,
                        double applyFrom,
                        double applyTo) {
    m_interpolations.push_back(InterpolationRecord(std::move(interpolation),
                                                   std::move(easing), start,
                                                   end, applyFrom, applyTo));
  }

  void addInterpolationsFromKeyframes(
      const PropertyHandle&,
      const Keyframe::PropertySpecificKeyframe& keyframeA,
      const Keyframe::PropertySpecificKeyframe& keyframeB,
      double applyFrom,
      double applyTo);

 private:
  struct InterpolationRecord {
    InterpolationRecord(PassRefPtr<Interpolation> interpolation,
                        PassRefPtr<TimingFunction> easing,
                        double start,
                        double end,
                        double applyFrom,
                        double applyTo)
        : m_interpolation(interpolation),
          m_easing(easing),
          m_start(start),
          m_end(end),
          m_applyFrom(applyFrom),
          m_applyTo(applyTo) {}

    RefPtr<Interpolation> m_interpolation;
    RefPtr<TimingFunction> m_easing;
    double m_start;
    double m_end;
    double m_applyFrom;
    double m_applyTo;
  };

  bool m_isPopulated;
  Vector<InterpolationRecord> m_interpolations;
};

}  // namespace blink

#endif  // InterpolationEffect_h