math.h

/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2019  Olive Team

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#ifndef MATH_H
#define MATH_H

#include <QRect>

int lerp(int a, int b, double t);
float float_lerp(float a, float b, float t);
double double_lerp(double a, double b, double t);
double quad_from_t(double a, double b, double c, double t);
double quad_t_from_x(double x, double a, double b, double c);
double cubic_from_t(double a, double b, double c, double d, double t);
double cubic_t_from_x(double x_target, double a, double b, double c, double d);
double solveCubicBezier(double p0, double p1, double p2, double p3, double x);

template <typename T>
const T& clamp(const T& val, T& min, T& max);

QRect fit_size_into_rect(const QRect& r, int width, int height);

// decibel conversion functions
double amplitude_to_db(double amplitude);
double db_to_amplitude(double db);

// frame <-> pixel conversion functions
int getScreenPointFromFrame(double zoom, long frame);
long getFrameFromScreenPoint(double zoom, int x);

#endif // MATH_H