// Copyright 2012 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 CC_ANIMATION_TIMING_FUNCTION_H_
#define CC_ANIMATION_TIMING_FUNCTION_H_

#include "cc/animation/animation_curve.h"
#include "cc/base/cc_export.h"
#include "third_party/skia/include/core/SkScalar.h"

namespace cc {

// See http://www.w3.org/TR/css3-transitions/.
class CC_EXPORT TimingFunction : public FloatAnimationCurve {
 public:
  virtual ~TimingFunction();

  // Partial implementation of FloatAnimationCurve.
  virtual double Duration() const OVERRIDE;

  // The smallest and largest values returned by GetValue for inputs in
  // [0, 1].
  virtual void Range(float* min, float* max) const = 0;

 protected:
  TimingFunction();

 private:
  DISALLOW_ASSIGN(TimingFunction);
};

class CC_EXPORT CubicBezierTimingFunction : public TimingFunction {
 public:
  static scoped_ptr<CubicBezierTimingFunction> Create(double x1, double y1,
                                                      double x2, double y2);
  virtual ~CubicBezierTimingFunction();

  // Partial implementation of FloatAnimationCurve.
  virtual float GetValue(double time) const OVERRIDE;
  virtual scoped_ptr<AnimationCurve> Clone() const OVERRIDE;

  virtual void Range(float* min, float* max) const OVERRIDE;

 protected:
  CubicBezierTimingFunction(double x1, double y1, double x2, double y2);

  double x1_;
  double y1_;
  double x2_;
  double y2_;

 private:
  DISALLOW_ASSIGN(CubicBezierTimingFunction);
};

class CC_EXPORT EaseTimingFunction {
 public:
  static scoped_ptr<TimingFunction> Create();

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseTimingFunction);
};

class CC_EXPORT EaseInTimingFunction {
 public:
  static scoped_ptr<TimingFunction> Create();

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInTimingFunction);
};

class CC_EXPORT EaseOutTimingFunction {
 public:
  static scoped_ptr<TimingFunction> Create();

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseOutTimingFunction);
};

class CC_EXPORT EaseInOutTimingFunction {
 public:
  static scoped_ptr<TimingFunction> Create();

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInOutTimingFunction);
};

}  // namespace cc

#endif  // CC_ANIMATION_TIMING_FUNCTION_H_