File indexing completed on 2024-05-12 15:56:12

 /*
  *  SPDX-FileCopyrightText: 2020 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include "KisColorfulBrush.h"
 
 
 KisColorfulBrush::KisColorfulBrush(const QString &filename)
     : KisScalingSizeBrush(filename)
 {
 }
 
 #include <KoColorSpaceMaths.h>
 #include <KoColorSpaceTraits.h>
 
 namespace {
 
 qreal estimateImageAverage(const QImage &image) {
     qint64 lightnessSum = 0;
     qint64 alphaSum = 0;
 
     KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(image.format() == QImage::Format_ARGB32, 0.5);
 
     for (int y = 0; y < image.height(); ++y) {
         const QRgb *pixel = reinterpret_cast<const QRgb*>(image.scanLine(y));
 
         for (int i = 0; i < image.width(); ++i) {
             lightnessSum += qRound(qGray(*pixel) * qAlpha(*pixel) / 255.0);
             alphaSum += qAlpha(*pixel);
             pixel++;
         }
     }
 
     return 255.0 * qreal(lightnessSum) / alphaSum;
 }
 
 }
 
 qreal KisColorfulBrush::estimatedSourceMidPoint() const
 {
     return estimateImageAverage(KisBrush::brushTipImage());
 }
 
 qreal KisColorfulBrush::adjustedMidPoint() const
 {
     return estimateImageAverage(this->brushTipImage());
 }
 
 bool KisColorfulBrush::autoAdjustMidPoint() const
 {
     return m_autoAdjustMidPoint;
 }
 
 void KisColorfulBrush::setAutoAdjustMidPoint(bool autoAdjustMidPoint)
 {
     m_autoAdjustMidPoint = autoAdjustMidPoint;
 }
 
 QImage KisColorfulBrush::brushTipImage() const
 {
     QImage image = KisBrush::brushTipImage();
     if (isImageType() && brushApplication() != IMAGESTAMP) {
 
         KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(image.format() == QImage::Format_ARGB32, image);
 
         const qreal adjustmentMidPoint =
                 m_autoAdjustMidPoint ?
                 estimateImageAverage(image) :
                 m_adjustmentMidPoint;
 
         if (qAbs(adjustmentMidPoint - 127.0) > 0.1 ||
             !qFuzzyIsNull(m_brightnessAdjustment) ||
             !qFuzzyIsNull(m_contrastAdjustment)) {
 
             const int half = KoColorSpaceMathsTraits<quint8>::halfValue;
             const int unit = KoColorSpaceMathsTraits<quint8>::unitValue;
 
             const qreal midX = adjustmentMidPoint;
             const qreal midY = m_brightnessAdjustment > 0 ?
                         KoColorSpaceMaths<qreal>::blend(unit, half, m_brightnessAdjustment) :
                         KoColorSpaceMaths<qreal>::blend(0, half, -m_brightnessAdjustment);
 
             qreal loA = 0.0;
             qreal hiA = 0.0;
 
             qreal loB = 0.0;
             qreal hiB = 255.0;
 
             if (!qFuzzyCompare(m_contrastAdjustment, 1.0)) {
                 if (m_contrastAdjustment > 0.0) {
                     loA = midY / (1.0 - m_contrastAdjustment) / midX;
                     hiA = (unit - midY) / (1.0 - m_contrastAdjustment) / (unit - midX);
                 } else {
                     loA = midY * (1.0 + m_contrastAdjustment) / midX;
                     hiA = (unit - midY) * (1.0 + m_contrastAdjustment) / (unit - midX);
                 }
 
                 loB = midY - midX * loA;
                 hiB = midY - midX * hiA;
             }
 
             for (int y = 0; y < image.height(); y++) {
                 QRgb *pixel = reinterpret_cast<QRgb *>(image.scanLine(y));
                 for (int x = 0; x < image.width(); x++) {
                     QRgb c = pixel[x];
 
                     int v = qGray(c);
 
                     if (v >= midX) {
                         v = qMin(unit, qRound(hiA * v + hiB));
                     } else {
                         v = qMax(0, qRound(loA * v + loB));
                     }
 
                     pixel[x] = qRgba(v, v, v, qAlpha(c));
                 }
             }
         } else {
             for (int y = 0; y < image.height(); y++) {
                 QRgb *pixel = reinterpret_cast<QRgb *>(image.scanLine(y));
                 for (int x = 0; x < image.width(); x++) {
                     QRgb c = pixel[x];
 
                     int v = qGray(c);
                     pixel[x] = qRgba(v, v, v, qAlpha(c));
                 }
             }
         }
     }
     return image;
 }
 
 void KisColorfulBrush::setAdjustmentMidPoint(quint8 value)
 {
     if (m_adjustmentMidPoint != value) {
         m_adjustmentMidPoint = value;
         clearBrushPyramid();
     }
 }
 
 void KisColorfulBrush::setBrightnessAdjustment(qreal value)
 {
     if (m_brightnessAdjustment != value) {
         m_brightnessAdjustment = value;
         clearBrushPyramid();
     }
 }
 
 void KisColorfulBrush::setContrastAdjustment(qreal value)
 {
     if (m_contrastAdjustment != value) {
         m_contrastAdjustment = value;
         clearBrushPyramid();
     }
 }
 
 bool KisColorfulBrush::isImageType() const
 {
     return brushType() == IMAGE || brushType() == PIPE_IMAGE;
 }
 
 quint8 KisColorfulBrush::adjustmentMidPoint() const
 {
     return m_adjustmentMidPoint;
 }
 
 qreal KisColorfulBrush::brightnessAdjustment() const
 {
     return m_brightnessAdjustment;
 }
 
 qreal KisColorfulBrush::contrastAdjustment() const
 {
     return m_contrastAdjustment;
 }
 
 #include <QDomElement>
 
 void KisColorfulBrush::toXML(QDomDocument& d, QDomElement& e) const
 {
     // legacy setting, now 'brushApplication' is used instead
     e.setAttribute("ColorAsMask", QString::number((int)(brushApplication() != IMAGESTAMP)));
 
     e.setAttribute("AdjustmentMidPoint", QString::number(m_adjustmentMidPoint));
     e.setAttribute("BrightnessAdjustment", QString::number(m_brightnessAdjustment));
     e.setAttribute("ContrastAdjustment", QString::number(m_contrastAdjustment));
     e.setAttribute("AutoAdjustMidPoint", QString::number(m_autoAdjustMidPoint));
     e.setAttribute("AdjustmentVersion", QString::number(2));
     KisBrush::toXML(d, e);
 }
 
 void KisColorfulBrush::setHasColorAndTransparency(bool value)
 {
     m_hasColorAndTransparency = value;
 }
 
 bool KisColorfulBrush::hasColorAndTransparency() const
 {
     return m_hasColorAndTransparency;
 }