File indexing completed on 2024-06-16 04:16:37

 /*
  * This file is part of Krita
  *
  * SPDX-FileCopyrightText: 2004 Cyrille Berger <cberger@cberger.net>
  * SPDX-FileCopyrightText: 2021 Deif Lou <giniba@gmail.net>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include <KoColorSpace.h>
 #include <KoChannelInfo.h>
 #include <KoColorModelStandardIds.h>
 #include <kis_assert.h>
 #include <KoCompositeColorTransformation.h>
 #include <kis_cubic_curve.h>
 
 #include "../../color/colorspaceextensions/kis_hsv_adjustment.h"
 
 #include "kis_multichannel_utils.h"
 
 namespace KisMultiChannelUtils {
 
 QVector<VirtualChannelInfo> getVirtualChannels(const KoColorSpace *cs,
                                                int maxChannels,
                                                bool supportsLightness,
                                                bool supportsHue,
                                                bool supportsSaturation)
 {
     supportsLightness =
         supportsLightness &&
         cs->colorModelId() != LABAColorModelID &&
         cs->colorModelId() != GrayAColorModelID &&
         cs->colorModelId() != GrayColorModelID &&
         cs->colorModelId() != AlphaColorModelID;
 
     supportsHue = supportsHue && supportsLightness;
     supportsSaturation = supportsSaturation && supportsLightness;
 
     QVector<VirtualChannelInfo> vchannels;
 
     QList<KoChannelInfo *> sortedChannels =
         KoChannelInfo::displayOrderSorted(cs->channels());
 
     if (supportsLightness) {
         vchannels << VirtualChannelInfo(VirtualChannelInfo::ALL_COLORS, -1, 0, cs);
     }
 
     Q_FOREACH (KoChannelInfo *channel, sortedChannels) {
         int pixelIndex = KoChannelInfo::displayPositionToChannelIndex(channel->displayPosition(), cs->channels());
         vchannels << VirtualChannelInfo(VirtualChannelInfo::REAL, pixelIndex, channel, cs);
     }
 
     if (supportsHue) {
         vchannels << VirtualChannelInfo(VirtualChannelInfo::HUE, -1, 0, cs);
     }
 
     if (supportsSaturation) {
         vchannels << VirtualChannelInfo(VirtualChannelInfo::SATURATION, -1, 0, cs);
     }
 
     if (supportsLightness) {
         vchannels << VirtualChannelInfo(VirtualChannelInfo::LIGHTNESS, -1, 0, cs);
     }
 
     if (maxChannels >= 0 && vchannels.size() > maxChannels) {
         vchannels.resize(maxChannels);
     }
 
     return vchannels;
 }
 
 int findChannel(const QVector<VirtualChannelInfo> &virtualChannels,
                 const VirtualChannelInfo::Type &channelType)
 {
     for (int i = 0; i < virtualChannels.size(); i++) {
         if (virtualChannels[i].type() == channelType) {
             return i;
         }
     }
     return -1;
 }
 
 KoColorTransformation* createPerChannelTransformationFromTransfers(const KoColorSpace *cs,
                                                                    const QVector<QVector<quint16>> &transfers,
                                                                    const QList<bool> &transferIsIdentity)
 {
     /**
      * TODO: What about the order of channels? (DK)
      *
      * Virtual channels are sorted in display order, does Lcms accepts
      * transforms in display order? Why on Earth it works?! Is it
      * documented anywhere?
      */
     const QVector<VirtualChannelInfo> virtualChannels = getVirtualChannels(cs, transfers.size());
 
     if (transfers.size() > int(virtualChannels.size())) {
         // We got an illegal number of colorchannels :(
         return 0;
     }
 
     bool colorsNull = true;
     bool hueNull = true;
     bool saturationNull = true;
     bool lightnessNull = true;
     bool allColorsNull = true;
     int alphaIndexInReal = -1;
 
     QVector<QVector<quint16> > realTransfers;
     QVector<quint16> hueTransfer;
     QVector<quint16> saturationTransfer;
     QVector<quint16> lightnessTransfer;
     QVector<quint16> allColorsTransfer;
 
     for (int i = 0; i < virtualChannels.size(); i++) {
         if (virtualChannels[i].type() == VirtualChannelInfo::REAL) {
             realTransfers << transfers[i];
 
             if (virtualChannels[i].isAlpha()) {
                 alphaIndexInReal = realTransfers.size() - 1;
             }
 
             if (colorsNull && !transferIsIdentity[i]) {
                 colorsNull = false;
             }
         } else if (virtualChannels[i].type() == VirtualChannelInfo::HUE) {
             KIS_ASSERT_RECOVER_NOOP(hueTransfer.isEmpty());
             hueTransfer = transfers[i];
 
             if (hueNull && !transferIsIdentity[i]) {
                 hueNull = false;
             }
         } else if (virtualChannels[i].type() == VirtualChannelInfo::SATURATION) {
             KIS_ASSERT_RECOVER_NOOP(saturationTransfer.isEmpty());
             saturationTransfer = transfers[i];
 
             if (saturationNull && !transferIsIdentity[i]) {
                 saturationNull = false;
             }
         } else if (virtualChannels[i].type() == VirtualChannelInfo::LIGHTNESS) {
             KIS_ASSERT_RECOVER_NOOP(lightnessTransfer.isEmpty());
             lightnessTransfer = transfers[i];
 
             if (lightnessNull && !transferIsIdentity[i]) {
                 lightnessNull = false;
             }
         } else if (virtualChannels[i].type() == VirtualChannelInfo::ALL_COLORS) {
             KIS_ASSERT_RECOVER_NOOP(allColorsTransfer.isEmpty());
             allColorsTransfer = transfers[i];
 
             if (allColorsNull && !transferIsIdentity[i]) {
                 allColorsNull = false;
             }
         }
     }
 
     KoColorTransformation *hueTransform = 0;
     KoColorTransformation *saturationTransform = 0;
     KoColorTransformation *lightnessTransform = 0;
     KoColorTransformation *allColorsTransform = 0;
     KoColorTransformation *colorTransform = 0;
 
     /**
      * Sometimes the realTransfers are too low, this often happens with faulty config,
      * which in turn leads to trouble when creating a transform.
      */
     int missingTransfers = qMax(0, int(cs->channelCount()-realTransfers.size()));
     for (int i=0; i < missingTransfers; i++) {
         realTransfers.append(KisCubicCurve().uint16Transfer());
     }
 
     if (!colorsNull) {
         const quint16** transfers = new const quint16*[realTransfers.size()];
         for(int i = 0; i < realTransfers.size(); ++i) {
             transfers[i] = realTransfers[i].constData();
 
             /**
              * createPerChannelAdjustment() expects alpha channel to
              * be the last channel in the list, so just it here
              */
             KIS_ASSERT_RECOVER_NOOP(i != alphaIndexInReal ||
                                     alphaIndexInReal == (realTransfers.size() - 1));
         }
 
         colorTransform = cs->createPerChannelAdjustment(transfers);
         delete [] transfers;
     }
 
     if (!hueNull) {
         QHash<QString, QVariant> params;
         params["curve"] = QVariant::fromValue(hueTransfer);
         params["channel"] = KisHSVCurve::Hue;
         params["relative"] = false;
         params["lumaRed"]   = cs->lumaCoefficients()[0];
         params["lumaGreen"] = cs->lumaCoefficients()[1];
         params["lumaBlue"]  = cs->lumaCoefficients()[2];
 
         hueTransform = cs->createColorTransformation("hsv_curve_adjustment", params);
     }
 
     if (!saturationNull) {
         QHash<QString, QVariant> params;
         params["curve"] = QVariant::fromValue(saturationTransfer);
         params["channel"] = KisHSVCurve::Saturation;
         params["relative"] = false;
         params["lumaRed"]   = cs->lumaCoefficients()[0];
         params["lumaGreen"] = cs->lumaCoefficients()[1];
         params["lumaBlue"]  = cs->lumaCoefficients()[2];
 
         saturationTransform = cs->createColorTransformation("hsv_curve_adjustment", params);
     }
 
     if (!lightnessNull) {
         lightnessTransform = cs->createBrightnessContrastAdjustment(lightnessTransfer.constData());
     }
 
     if (!allColorsNull) {
         const quint16** allColorsTransfers = new const quint16*[realTransfers.size()];
         for(int i = 0; i < realTransfers.size(); ++i) {
             allColorsTransfers[i] = (i != alphaIndexInReal) ?
                 allColorsTransfer.constData() : 0;
 
             /**
              * createPerChannelAdjustment() expects alpha channel to
              * be the last channel in the list, so just it here
              */
             KIS_ASSERT_RECOVER_NOOP(i != alphaIndexInReal ||
                                     alphaIndexInReal == (realTransfers.size() - 1));
         }
 
         allColorsTransform = cs->createPerChannelAdjustment(allColorsTransfers);
         delete[] allColorsTransfers;
     }
 
     QVector<KoColorTransformation*> allTransforms;
     allTransforms << colorTransform;
     allTransforms << allColorsTransform;
     allTransforms << hueTransform;
     allTransforms << saturationTransform;
     allTransforms << lightnessTransform;
 
     return KoCompositeColorTransformation::createOptimizedCompositeTransform(allTransforms);
 }
 
 }