KisScreentoneBrightnessContrastFunctions.h

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/*
 * KDE. Krita Project.
 *
 * SPDX-FileCopyrightText: 2020 Deif Lou <ginoba@gmail.com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef KISSCREENTONEBRIGHTNESCONTRASTFUNCTIONS_H
#define KISSCREENTONEBRIGHTNESCONTRASTFUNCTIONS_H
 
#include <QtGlobal>
 
namespace KisScreentoneBrightnessContrastFunctions {
 
class Identity
{
public:
    inline qreal operator()(qreal x) const
    {
        return x;
    }
};
 
class BrightnessContrast
{
public:
    // brightness and contrast expected to be in the range [-1, 1]
    BrightnessContrast(qreal brightness, qreal contrast);
    qreal operator()(qreal x) const;
private:
    qreal m_m, m_b;
};
 
class Threshold
{
public:
    // threshold value expected to be in the range [0, 1]
    Threshold(qreal threshold);
    qreal operator()(qreal x) const;
private:
    const qreal m_threshold;
    const bool m_thresholdIsOne;
};
 
}
 
#endif