File indexing completed on 2024-05-12 15:58:51

 /*
  * KDE. Krita Project.
  *
  * SPDX-FileCopyrightText: 2021 Deif Lou <ginoba@gmail.com>
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <cmath>
 
 #include <kis_dom_utils.h>
 
 #include "KisLevelsCurve.h"
 
 KisLevelsCurve::KisLevelsCurve()
     : KisLevelsCurve(defaultInputBlackPoint(), defaultInputWhitePoint(), defaultInputGamma(),
                      defaultOutputBlackPoint(), defaultOutputWhitePoint())
 {}
 
 KisLevelsCurve::KisLevelsCurve(qreal inputBlackPoint, qreal inputWhitePoint, qreal inputGamma,
                                qreal outputBlackPoint, qreal outputWhitePoint)
     : m_inputBlackPoint(inputBlackPoint)
     , m_inputWhitePoint(inputWhitePoint)
     , m_inputGamma(inputGamma)
     , m_outputBlackPoint(outputBlackPoint)
     , m_outputWhitePoint(outputWhitePoint)
     , m_inputLevelsDelta(inputWhitePoint - inputBlackPoint)
     , m_inverseInputGamma(1.0 / m_inputGamma)
     , m_outputLevelsDelta(outputWhitePoint - outputBlackPoint)
     , m_mustRecomputeU16Transfer(true)
     , m_mustRecomputeFTransfer(true)
 {}
                 
 bool KisLevelsCurve::operator==(const KisLevelsCurve& rhs) const
 {
     return
         &rhs == this ||
         (
             m_inputBlackPoint == rhs.m_inputBlackPoint &&
             m_inputWhitePoint == rhs.m_inputWhitePoint &&
             m_inputGamma == rhs.m_inputGamma &&
             m_outputBlackPoint == rhs.m_outputBlackPoint &&
             m_outputWhitePoint == rhs.m_outputWhitePoint
         );
 }
 
 qreal KisLevelsCurve::value(qreal x) const
 {
     if (x <= m_inputBlackPoint)
         return m_outputBlackPoint;
     else if (x < m_inputWhitePoint) {
         return m_outputBlackPoint + m_outputLevelsDelta * std::pow((x - m_inputBlackPoint) / m_inputLevelsDelta, m_inverseInputGamma);
     } else {
         return m_outputWhitePoint;
     }
 }
 
 qreal KisLevelsCurve::inputBlackPoint() const
 {
     return m_inputBlackPoint;
 }
 
 qreal KisLevelsCurve::inputWhitePoint() const
 {
     return m_inputWhitePoint;
 }
 
 qreal KisLevelsCurve::inputGamma() const
 {
     return m_inputGamma;
 }
 
 qreal KisLevelsCurve::outputBlackPoint() const
 {
     return m_outputBlackPoint;
 }
 
 qreal KisLevelsCurve::outputWhitePoint() const
 {
     return m_outputWhitePoint;
 }
 
 void KisLevelsCurve::setInputBlackPoint(qreal newInputBlackPoint)
 {
     m_inputBlackPoint = newInputBlackPoint;
     m_inputLevelsDelta = m_inputWhitePoint - m_inputBlackPoint;
     invalidate();
 }
 
 void KisLevelsCurve::setInputWhitePoint(qreal newInputWhitePoint)
 {
     m_inputWhitePoint = newInputWhitePoint;
     m_inputLevelsDelta = m_inputWhitePoint - m_inputBlackPoint;
     invalidate();
 }
 
 void KisLevelsCurve::setInputGamma(qreal newInputGamma)
 {
     m_inputGamma = newInputGamma;
     m_inverseInputGamma = 1.0 / m_inputGamma;
     invalidate();
 }
 
 void KisLevelsCurve::setOutputBlackPoint(qreal newOutputBlackPoint)
 {
     m_outputBlackPoint = newOutputBlackPoint;
     m_outputLevelsDelta = m_outputWhitePoint - m_outputBlackPoint;
     invalidate();
 }
 
 void KisLevelsCurve::setOutputWhitePoint(qreal newOutputWhitePoint)
 {
     m_outputWhitePoint = newOutputWhitePoint;
     m_outputLevelsDelta = m_outputWhitePoint - m_outputBlackPoint;
     invalidate();
 }
 
 void KisLevelsCurve::resetAll()
 {
     m_inputBlackPoint = defaultInputBlackPoint();
     m_inputWhitePoint = defaultInputWhitePoint();
     m_inputGamma = defaultInputGamma();
     m_outputBlackPoint = defaultOutputBlackPoint();
     m_outputWhitePoint = defaultOutputWhitePoint();
     m_inputLevelsDelta = m_inputWhitePoint - m_inputBlackPoint;
     m_inverseInputGamma = 1.0 / m_inputGamma;
     m_outputLevelsDelta = m_outputWhitePoint - m_outputBlackPoint;
     invalidate();
 }
 
 void KisLevelsCurve::resetInputLevels()
 {
     m_inputBlackPoint = defaultInputBlackPoint();
     m_inputWhitePoint = defaultInputWhitePoint();
     m_inputGamma = defaultInputGamma();
     m_inputLevelsDelta = m_inputWhitePoint - m_inputBlackPoint;
     m_inverseInputGamma = 1.0 / m_inputGamma;
     invalidate();
 }
 
 void KisLevelsCurve::resetOutputLevels()
 {
     m_outputBlackPoint = defaultOutputBlackPoint();
     m_outputWhitePoint = defaultOutputWhitePoint();
     m_outputLevelsDelta = m_outputWhitePoint - m_outputBlackPoint;
     invalidate();
 }
 
 bool KisLevelsCurve::isIdentity() const
 {
     return 
         m_inputBlackPoint == 0.0 &&
         m_inputWhitePoint == 1.0 &&
         m_inputGamma == 1.0 &&
         m_outputBlackPoint == 0.0 &&
         m_outputWhitePoint == 1.0;
 }
 
 const QString& KisLevelsCurve::name() const
 {
     return m_name;
 }
 
 void KisLevelsCurve::setName(const QString &newName)
 {
     m_name = newName;
 }
 
 const QVector<quint16>& KisLevelsCurve::uint16Transfer(int size) const
 {
 
     if (!m_mustRecomputeU16Transfer && size == m_u16Transfer.size()) {
         return m_u16Transfer;
     }
 
     m_u16Transfer.resize(size);
 
     for (int i = 0; i < size; ++i) {
         const qreal x = static_cast<qreal>(i) / static_cast<qreal>(size - 1);
         m_u16Transfer[i] = static_cast<quint16>(qRound(value(x) * static_cast<qreal>(0xFFFF)));
     }
 
     m_mustRecomputeU16Transfer = false;
     return m_u16Transfer;
 }
 
 const QVector<qreal>& KisLevelsCurve::floatTransfer(int size) const
 {
     if (!m_mustRecomputeFTransfer && size == m_fTransfer.size()) {
         return m_fTransfer;
     }
 
     m_fTransfer.resize(size);
 
     for (int i = 0; i < size; ++i) {
         m_fTransfer[i] = value(static_cast<qreal>(i) / static_cast<qreal>(size - 1));
     }
 
     m_mustRecomputeFTransfer = false;
     return m_fTransfer;
 }
 
 QString KisLevelsCurve::toString() const
 {
     return
         KisDomUtils::toString(m_inputBlackPoint) + ";" +
         KisDomUtils::toString(m_inputWhitePoint) + ";" +
         KisDomUtils::toString(m_inputGamma) + ";" +
         KisDomUtils::toString(m_outputBlackPoint) + ";" +
         KisDomUtils::toString(m_outputWhitePoint);
 }
 
 void KisLevelsCurve::fromString(const QString &text, bool *ok)
 {
     const QStringList data = text.split(';');
 
     if (data.size() != 5) {
         if (ok) {
             *ok = false;
         }
         return;
     }
 
     qreal values[5];
     bool ok_;
     for (int i = 0; i < 5; ++i) {
         ok_ = false;
         values[i] = KisDomUtils::toDouble(data.at(i), &ok_);
         if (!ok_) {
             if (ok) {
                 *ok = false;
             }
             return;
         }
     }
 
     m_inputBlackPoint = values[0];
     m_inputWhitePoint = values[1];
     m_inputGamma = values[2];
     m_outputBlackPoint = values[3];
     m_outputWhitePoint = values[4];
     m_inputLevelsDelta = m_inputWhitePoint - m_inputBlackPoint;
     m_inverseInputGamma = 1.0 / m_inputGamma;
     m_outputLevelsDelta = m_outputWhitePoint - m_outputBlackPoint;
     invalidate();
 
     if (ok) {
         *ok = true;
     }
 }
 
 void KisLevelsCurve::invalidate()
 {
     m_mustRecomputeU16Transfer = true;
     m_mustRecomputeFTransfer = true;
 }