infinipaint/src/TimePoint.hpp

/*  
 * InfiniPaint
 * Copyright (C) 2025-2026 Yousef Khadadeh
 *
 * 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 <https://www.gnu.org/licenses/>.
 */

#pragma once
#include <chrono>
#include <algorithm>
#include <cmath>
#include <Helpers/BezierEasing.hpp>
#include <include/core/SkColor.h>
#include "SharedTypes.hpp"

template <typename T> T lerp_time(T t, T tEnd, T tStart = 0) {
    return std::clamp<T>((t - tStart) / (tEnd - tStart), 0, 1);
}

WorldVec lerp_world_vec_double(const WorldVec& v1, const WorldVec& v2, double t);

template<typename T, typename TimeType> std::enable_if_t<!std::is_arithmetic_v<T>, T> lerp_vec(const T& v1, const T& v2, TimeType t) {
    T item;
    for(unsigned i = 0; i < v1.size(); i++)
        item[i] = std::lerp(v1[i], v2[i], t);
    return item;
}

template<typename T, typename TimeType> std::enable_if_t<std::is_arithmetic_v<T>, T> lerp_vec(T v1, T v2, TimeType t) {
    return std::lerp(v1, v2, t);
}

template<typename TimeType> SkColor4f lerp_vec(const SkColor4f& t1, const SkColor4f& t2, TimeType t) {
    return {std::lerp(t1[0], t2[0], t),
            std::lerp(t1[1], t2[1], t),
            std::lerp(t1[2], t2[2], t),
            std::lerp(t1[3], t2[3], t)};
}

bool smooth_two_way_animation_time_check_for_change(float& timeToUpdate, float deltaTime, bool isWay1, float animDuration);
float smooth_two_way_animation_time_get_lerp(float& timeToUpdate, float deltaTime, bool isWay1, float animDuration);
void smooth_two_way_animation_time(float& timeToUpdate, float deltaTime, bool isWay1, float animDuration);

class TimePoint {
    public:
        TimePoint();
        void update_time_point();
        void update_time_since();
        float get_time_since() const;
        operator float() const;
    private:
        std::chrono::time_point<std::chrono::steady_clock> tp;
        float timeSince;
};