NOT FOR REVIEW - convert to cc animation

chrome/browser/android/vr_shell/easing.h

-// Copyright 2016 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 CHROME_BROWSER_ANDROID_VR_SHELL_EASING_H_
-#define CHROME_BROWSER_ANDROID_VR_SHELL_EASING_H_
-
-#include "base/macros.h"
-#include "ui/gfx/geometry/cubic_bezier.h"
-
-namespace vr_shell {
-namespace easing {
-
-enum EasingType {
-  LINEAR = 0,
-  CUBICBEZIER,
-  EASEIN,
-  EASEOUT,
-  EASEINOUT,
-};
-
-// Abstract base class for custom interpolators, mapping linear input between
-// 0 and 1 to custom values between those two points.
-class Easing {
- public:
-  // Compute an output value, given an input between 0 and 1. Output will
-  // equal input at (at least) points 0 and 1.
-  double CalculateValue(double input);
-  virtual ~Easing() {}
-
- protected:
-  Easing() {}
-  virtual double CalculateValueImpl(double input) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Easing);
-};
-
-// Linear interpolation generates output equal to input.
-class Linear : public Easing {
- public:
-  Linear() = default;
-  double CalculateValueImpl(double input) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Linear);
-};
-
-// Computes a cubic-bezier transition based on two control points.
-class CubicBezier : public Easing {
- public:
-  CubicBezier(double p1x, double p1y, double p2x, double p2y);
-  double CalculateValueImpl(double input) override;
-
- private:
-  gfx::CubicBezier bezier_;
-  DISALLOW_COPY_AND_ASSIGN(CubicBezier);
-};
-
-// Computes |input|^|power|.
-class EaseIn : public Easing {
- public:
-  explicit EaseIn(double power);
-  double CalculateValueImpl(double input) override;
-
- private:
-  double power_;
-  DISALLOW_COPY_AND_ASSIGN(EaseIn);
-};
-
-// Computes 1 - |input|^|power|.
-class EaseOut : public Easing {
- public:
-  explicit EaseOut(double power);
-  double CalculateValueImpl(double input) override;
-
- private:
-  double power_;
-  DISALLOW_COPY_AND_ASSIGN(EaseOut);
-};
-
-// Starts with EaseIn and finishes with EaseOut.
-class EaseInOut : public Easing {
- public:
-  explicit EaseInOut(double power);
-  double CalculateValueImpl(double input) override;
-
- private:
-  EaseIn ease_in_;
-  DISALLOW_COPY_AND_ASSIGN(EaseInOut);
-};
-
-}  // namespace easing
-}  // namespace vr_shell
-
-#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_EASING_H_