color.cpp

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// SPDX-FileCopyrightText: 2018 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
// SPDX-License-Identifier: MPL-2.0
 
#include "color.h"
 
Color::Color(QObject *parent)
    : QObject(parent)
{
}
 
QColor Color::transparent(const QColor &color, qreal alpha)
{
    return QColor(color.red(), color.green(), color.blue(),
                  int(qBound<qreal>(0.0, alpha, 1.0) * 255));
}
 
QColor Color::blend(const QColor &color1, const QColor &color2, qreal alpha)
{
    QColor color;
    color.setRedF(color1.redF() * 0.5 + color2.redF() * 0.5);
    color.setGreenF(color1.greenF() * 0.5 + color2.greenF() * 0.5);
    color.setBlueF(color1.blueF() * 0.5 + color2.blueF() * 0.5);
    return transparent(color, alpha);
}
 
qreal Color::luminance(const QColor &color)
{
    return (color.redF() * 0.2126) + (color.greenF() * 0.7152) + (color.blueF() * 0.0722);
}
 
bool Color::isDarkColor(const QColor &color)
{
    auto a = 1.0 - (0.299 * color.redF() + 0.587 * color.greenF() + 0.114 * color.blueF());
    return color.alphaF() > 0.0 && a >= 0.3;
}
 
QColor Color::lightDark(const QColor &background, const QColor &lightColor, const QColor &darkColor)
{
    return isDarkColor(background) ? darkColor : lightColor;
}
 
Color *Color::create(QQmlEngine *engine, QJSEngine *jsEngine)
{
    Q_UNUSED(engine)
    Q_UNUSED(jsEngine)
 
    return new Color();
}