/*
 * Copyright (C) 2020, KylinSoft Co., Ltd.
 *
 * 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/>.
 */
#include "colorutils.h"

inline qreal getColorLuma(const QColor &c) {
    return 0.30 * c.redF() + 0.59 * c.greenF() + 0.11 * c.blueF();
}

bool ColorUtils::colorIsDark(const QColor &c) {
    bool isWhite = false;
    if (getColorLuma(c) <= 0.60) {
        isWhite = true;
    }
    return isWhite;
}

QColor ColorUtils::contrastColor(const QColor &c) {
    int change = colorIsDark(c) ? 30 : -45;

    return QColor(qBound(0, c.red() + change, 255),
                  qBound(0, c.green() + change, 255),
                  qBound(0, c.blue() + change, 255));
}

