108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "math.h"
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#include <QtMath>
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#include <QVector>
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#include "debug.h"
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int lerp(int a, int b, double t) {
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return qRound(((1.0 - t) * a) + (t * b));
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}
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float float_lerp(float a, float b, float t) {
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return ((1.0F - t) * a) + (t * b);
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}
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double double_lerp(double a, double b, double t) {
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return ((1.0 - t) * a) + (t * b);
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}
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double quad_from_t(double a, double b, double c, double t) {
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return qPow(1.0 - t, 2)*a + 2*(1.0 - t)*t*b + qPow(t, 2)*c;
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}
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double quad_t_from_x(double x, double a, double b, double c) {
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return (a - b + qSqrt(a*x + c*x - 2*b*x + qPow(b, 2) - a*c))/(a - 2*b + c);
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// alt: return (a - b - qSqrt(a*x + c*x - 2*b*x + qPow(b, 2) - a*c))/(a - 2*b + c);
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}
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double cubic_from_t(double a, double b, double c, double d, double t) {
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return qPow(1.0 - t, 3)*a + 3*qPow(1.0 - t, 2)*t*b + 3*(1.0 - t)*qPow(t, 2)*c + qPow(t, 3)*d;
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}
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double cubic_t_from_x(double x_target, double a, double b, double c, double d) {
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double tolerance = 0.0001;
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double lower = 0.0;
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double upper = 1.0;
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double percent = 0.5;
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double x = cubic_from_t(a, b, c, d, percent);
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while (qAbs(x_target - x) > tolerance) {
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if (x_target > x) {
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lower = percent;
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} else {
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upper = percent;
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}
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percent = (upper + lower) / 2.0;
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x = cubic_from_t(a, b, c, d, percent);
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}
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return percent;
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}
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double amplitude_to_db(double amplitude) {
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return (20.0*(qLn(amplitude)/qLn(10.0)));
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}
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double db_to_amplitude(double db) {
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return qPow(M_E, (db*qLn(10.0))/20.0);
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}
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QRect fit_size_into_rect(const QRect &r, int width, int height)
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{
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// Get aspect ratio of object we're fitting
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double inner_ar = double(width) / double(height);
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// Get aspect ratio of rectangle
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double rect_ar = double(r.width()) / double(r.height());
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if (rect_ar > inner_ar) {
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// The rect is wider than the object, so we'll be limiting by height and scaling by width
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int new_width = qRound(r.height() * inner_ar);
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return QRect(r.x() + (r.width() / 2 - new_width / 2), r.y(), new_width, r.height());
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} else {
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// The rect is taller than the object, so we'll be limiting by width and scaling by height
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int new_height = qRound(r.width() / inner_ar);
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return QRect(r.x(), r.y() + (r.height() / 2 - new_height / 2), r.width(), new_height);
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}
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}
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template<typename T>
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const T &clamp(const T &val, T &min, T &max)
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{
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return qMax(qMin(max, val), min);
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}
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