Plugin for soft-proofing

Pdf4QtLib/sources/pdfcms.cpp

@@ -59,9 +59,13 @@ private:
         RGB,
         CMYK,
         XYZ,
+        SoftProofing,
         ProfileCount
     };
 
+    /// Returns true, if we are doing soft-proofing
+    bool isSoftProofing() const;
+
     /// Creates a profile using provided id and a list of profile descriptors.
     /// If profile can't be created, then null handle is returned.
     /// \param id Id of color profile
@@ -455,7 +459,23 @@ cmsHTRANSFORM PDFLittleCMS::getTransformFromICCProfile(const QByteArray& iccData
                 if (const cmsUInt32Number inputDataFormat = getProfileDataFormat(profile))
                 {
                     cmsUInt32Number lcmsIntent = getLittleCMSRenderingIntent(effectiveRenderingIntent);
-                    transform = cmsCreateTransform(profile, inputDataFormat, m_profiles[Output], isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, lcmsIntent, getTransformationFlags());
+
+                    if (isSoftProofing())
+                    {
+                        cmsHPROFILE proofingProfile = m_profiles[SoftProofing];
+                        RenderingIntent proofingIntent = m_settings.proofingIntent;
+                        if (m_settings.proofingIntent == RenderingIntent::Auto)
+                        {
+                            proofingIntent = effectiveRenderingIntent;
+                        }
+
+                        transform = cmsCreateProofingTransform(profile, inputDataFormat, m_profiles[Output], isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, proofingProfile,
+                                                               lcmsIntent, getLittleCMSRenderingIntent(proofingIntent), getTransformationFlags());
+                    }
+                    else
+                    {
+                        transform = cmsCreateTransform(profile, inputDataFormat, m_profiles[Output], isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, lcmsIntent, getTransformationFlags());
+                    }
                 }
                 cmsCloseProfile(profile);
             }
@@ -514,8 +534,12 @@ void PDFLittleCMS::init()
     m_profiles[Gray] = createProfile(m_settings.deviceGray, m_manager->getGrayProfiles());
     m_profiles[RGB] = createProfile(m_settings.deviceRGB, m_manager->getRGBProfiles());
     m_profiles[CMYK] = createProfile(m_settings.deviceCMYK, m_manager->getCMYKProfiles());
+    m_profiles[SoftProofing] = createProfile(m_settings.softProofingProfile, m_manager->getCMYKProfiles());
     m_profiles[XYZ] = cmsCreateXYZProfile();
 
+    cmsUInt16Number alarmCodes[cmsMAXCHANNELS] = { 0xFFFF };
+    cmsSetAlarmCodes(alarmCodes);
+
     if (m_settings.isWhitePaperColorTransformed)
     {
         m_paperColor = getColorFromDeviceRGB(PDFColor(1.0f, 1.0f, 1.0f), RenderingIntent::AbsoluteColorimetric, nullptr);
@@ -533,6 +557,11 @@ void PDFLittleCMS::init()
     m_transformationCache.reserve(64);
 }
 
+bool PDFLittleCMS::isSoftProofing() const
+{
+    return (m_settings.isSoftProofing || m_settings.isGamutChecking) && m_profiles[SoftProofing];
+}
+
 cmsHPROFILE PDFLittleCMS::createProfile(const QString& id, const PDFColorProfileIdentifiers& profileDescriptors) const
 {
     auto it = std::find_if(profileDescriptors.cbegin(), profileDescriptors.cend(), [&id](const PDFColorProfileIdentifier& identifier) { return identifier.id == id; });
@@ -621,7 +650,22 @@ cmsHTRANSFORM PDFLittleCMS::getTransform(Profile profile, RenderingIntent intent
 
             if (input && output)
             {
-                transform = cmsCreateTransform(input, getProfileDataFormat(input), output, isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, getLittleCMSRenderingIntent(intent), getTransformationFlags());
+                if (isSoftProofing())
+                {
+                    cmsHPROFILE proofingProfile = m_profiles[SoftProofing];
+                    RenderingIntent proofingIntent = m_settings.proofingIntent;
+                    if (m_settings.proofingIntent == RenderingIntent::Auto)
+                    {
+                        proofingIntent = intent;
+                    }
+
+                    transform = cmsCreateProofingTransform(input, getProfileDataFormat(input), output, isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, proofingProfile,
+                                                           getLittleCMSRenderingIntent(intent), getLittleCMSRenderingIntent(proofingIntent), getTransformationFlags());
+                }
+                else
+                {
+                    transform = cmsCreateTransform(input, getProfileDataFormat(input), output, isRGB888Buffer ? TYPE_RGB_8 : TYPE_RGB_FLT, getLittleCMSRenderingIntent(intent), getTransformationFlags());
+                }
             }
 
             it = m_transformationCache.insert(std::make_pair(key, transform)).first;
@@ -662,6 +706,16 @@ cmsUInt32Number PDFLittleCMS::getTransformationFlags() const
             break;
     }
 
+    if (m_settings.isGamutChecking)
+    {
+        flags |= cmsFLAGS_GAMUTCHECK;
+    }
+
+    if (m_settings.isSoftProofing)
+    {
+        flags |= cmsFLAGS_SOFTPROOFING;
+    }
+
     return flags;
 }
 

Pdf4QtLib/sources/pdfcms.h

@@ -60,13 +60,17 @@ struct PDFCMSSettings
     System system = System::Generic;
     Accuracy accuracy = Accuracy::Medium;
     RenderingIntent intent = RenderingIntent::Auto;
+    RenderingIntent proofingIntent = RenderingIntent::RelativeColorimetric;
     bool isBlackPointCompensationActive = true;
     bool isWhitePaperColorTransformed = false;
-    QString outputCS;           ///< Output (rendering) color space
-    QString deviceGray;         ///< Identifiers for color space (device gray)
-    QString deviceRGB;          ///< Identifiers for color space (device RGB)
-    QString deviceCMYK;         ///< Identifiers for color space (device CMYK)
-    QString profileDirectory;   ///< Directory containing color profiles
+    bool isGamutChecking = false;
+    bool isSoftProofing = false;
+    QString outputCS;               ///< Output (rendering) color space
+    QString deviceGray;             ///< Identifiers for color space (device gray)
+    QString deviceRGB;              ///< Identifiers for color space (device RGB)
+    QString deviceCMYK;             ///< Identifiers for color space (device CMYK)
+    QString softProofingProfile;    ///< Identifiers for soft proofing profile
+    QString profileDirectory;       ///< Directory containing color profiles
 };
 
 /// Color management system base class. It contains functions to transform

Pdf4QtLib/sources/pdfplugin.cpp

@@ -23,6 +23,7 @@ namespace pdf
 PDFPlugin::PDFPlugin(QObject* parent) :
     QObject(parent),
     m_widget(nullptr),
+    m_cmsManager(nullptr),
     m_document(nullptr)
 {
 
@@ -33,6 +34,11 @@ void PDFPlugin::setWidget(PDFWidget* widget)
     m_widget = widget;
 }
 
+void PDFPlugin::setCMSManager(PDFCMSManager* manager)
+{
+    m_cmsManager = manager;
+}
+
 void PDFPlugin::setDocument(const PDFModifiedDocument& document)
 {
     m_document = document;

Pdf4QtLib/sources/pdfplugin.h

@@ -30,6 +30,7 @@ class QAction;
 namespace pdf
 {
 class PDFWidget;
+class PDFCMSManager;
 
 struct Pdf4QtLIBSHARED_EXPORT PDFPluginInfo
 {
@@ -51,11 +52,13 @@ public:
     explicit PDFPlugin(QObject* parent);
 
     virtual void setWidget(PDFWidget* widget);
+    virtual void setCMSManager(PDFCMSManager* manager);
     virtual void setDocument(const PDFModifiedDocument& document);
     virtual std::vector<QAction*> getActions() const;
 
 protected:
     PDFWidget* m_widget;
+    PDFCMSManager* m_cmsManager;
     PDFDocument* m_document;
 };
 

Pdf4QtViewer/pdfprogramcontroller.cpp

@@ -1686,6 +1686,7 @@ void PDFProgramController::loadPlugins()
     for (const auto& plugin : m_loadedPlugins)
     {
         plugin.second->setWidget(m_pdfWidget);
+        plugin.second->setCMSManager(m_CMSManager);
         std::vector<QAction*> actions = plugin.second->getActions();
 
         if (!actions.empty())

Pdf4QtViewer/pdfviewersettingsdialog.ui

@@ -26,7 +26,7 @@
      <item>
       <widget class="QStackedWidget" name="stackedWidget">
        <property name="currentIndex">
-        <number>11</number>
+        <number>5</number>
        </property>
        <widget class="QWidget" name="enginePage">
         <layout class="QVBoxLayout" name="enginePageLayout">

Pdf4QtViewerPlugins/Pdf4QtViewerPlugins.pro

@@ -19,6 +19,7 @@
 TEMPLATE = subdirs
 
 SUBDIRS += \
-    DimensionsPlugin
+    DimensionsPlugin \
+    SoftProofingPlugin
 
 

Pdf4QtViewerPlugins/SoftProofingPlugin/SoftProofingPlugin.json

@@ -0,0 +1,7 @@
+{
+    "Name" : "SoftProofing",
+    "Author" : "Jakub Melka",
+    "Version" : "1.0.0",
+    "License" : "LGPL v3",
+    "Description" : "Perform soft-proofing / gamut checking with CMYK profiles on a document."
+}

Pdf4QtViewerPlugins/SoftProofingPlugin/SoftProofingPlugin.pro

@@ -0,0 +1,52 @@
+#    Copyright (C) 2020 Jakub Melka
+#
+#    This file is part of Pdf4Qt.
+#
+#    Pdf4Qt is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Lesser General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Pdf4Qt is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Lesser General Public License for more details.
+#
+#    You should have received a copy of the GNU Lesser General Public License
+#    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+TEMPLATE = lib
+DEFINES += SOFTPROOFINGPLUGIN_LIBRARY
+
+QT += gui widgets
+
+LIBS += -L$$OUT_PWD/../..
+
+LIBS += -lPdf4QtLib
+
+QMAKE_CXXFLAGS += /std:c++latest /utf-8
+
+INCLUDEPATH += $$PWD/../../Pdf4QtLib/Sources
+
+DESTDIR = $$OUT_PWD/../../pdfplugins
+
+CONFIG += c++11
+
+SOURCES += \
+    softproofingplugin.cpp \
+    settingsdialog.cpp
+
+HEADERS += \
+    softproofingplugin.h \
+    settingsdialog.h
+
+CONFIG += force_debug_info
+
+DISTFILES += \
+    SoftProofingPlugin.json
+
+RESOURCES += \
+    icons.qrc
+
+FORMS += \
+    settingsdialog.ui

Pdf4QtViewerPlugins/SoftProofingPlugin/icons.qrc

@@ -0,0 +1,7 @@
+<RCC>
+    <qresource prefix="/pdfplugins/softproofing">
+        <file>gamut-checking.svg</file>
+        <file>soft-proofing.svg</file>
+        <file>settings.svg</file>
+    </qresource>
+</RCC>

Pdf4QtViewerPlugins/SoftProofingPlugin/settingsdialog.cpp

@@ -0,0 +1,58 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of Pdf4Qt.
+//
+//    Pdf4Qt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    Pdf4Qt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "settingsdialog.h"
+#include "ui_settingsdialog.h"
+
+#include "pdfwidgetutils.h"
+
+SettingsDialog::SettingsDialog(QWidget* parent, const pdf::PDFCMSSettings& settings, const pdf::PDFCMSManager* manager) :
+    QDialog(parent),
+    ui(new Ui::SettingsDialog),
+    m_settings(settings)
+{
+    ui->setupUi(this);
+
+    ui->cmsProofingIntentComboBox->addItem(tr("Auto"), int(pdf::RenderingIntent::Auto));
+    ui->cmsProofingIntentComboBox->addItem(tr("Perceptual"), int(pdf::RenderingIntent::Perceptual));
+    ui->cmsProofingIntentComboBox->addItem(tr("Relative colorimetric"), int(pdf::RenderingIntent::RelativeColorimetric));
+    ui->cmsProofingIntentComboBox->addItem(tr("Absolute colorimetric"), int(pdf::RenderingIntent::AbsoluteColorimetric));
+    ui->cmsProofingIntentComboBox->addItem(tr("Saturation"), int(pdf::RenderingIntent::Saturation));
+
+    for (const pdf::PDFColorProfileIdentifier& identifier : manager->getCMYKProfiles())
+    {
+        ui->cmsProofingColorProfileComboBox->addItem(identifier.name, identifier.id);
+    }
+
+    ui->cmsProofingIntentComboBox->setCurrentIndex(ui->cmsProofingIntentComboBox->findData(int(m_settings.proofingIntent)));
+    ui->cmsProofingColorProfileComboBox->setCurrentIndex(ui->cmsProofingColorProfileComboBox->findData(m_settings.softProofingProfile));
+
+    setMinimumSize(pdf::PDFWidgetUtils::scaleDPI(this, QSize(320, 160)));
+}
+
+SettingsDialog::~SettingsDialog()
+{
+    delete ui;
+}
+
+void SettingsDialog::accept()
+{
+    m_settings.proofingIntent = static_cast<pdf::RenderingIntent>(ui->cmsProofingIntentComboBox->currentData().toInt());
+    m_settings.softProofingProfile = ui->cmsProofingColorProfileComboBox->currentData().toString();
+
+    QDialog::accept();
+}

Pdf4QtViewerPlugins/SoftProofingPlugin/settingsdialog.h

@@ -0,0 +1,51 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of Pdf4Qt.
+//
+//    Pdf4Qt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    Pdf4Qt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef SETTINGSDIALOG_H
+#define SETTINGSDIALOG_H
+
+#include "softproofingplugin.h"
+#include "pdfcms.h"
+
+#include <QDialog>
+
+class QComboBox;
+
+namespace Ui
+{
+class SettingsDialog;
+}
+
+class SettingsDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit SettingsDialog(QWidget* parent, const pdf::PDFCMSSettings& settings, const pdf::PDFCMSManager* manager);
+    virtual ~SettingsDialog() override;
+
+    virtual void accept() override;
+
+    const pdf::PDFCMSSettings& getSettings() const { return m_settings; }
+
+private:
+    Ui::SettingsDialog* ui;
+
+    pdf::PDFCMSSettings m_settings;
+};
+
+#endif // SETTINGSDIALOG_H

Pdf4QtViewerPlugins/SoftProofingPlugin/settingsdialog.ui

@@ -0,0 +1,106 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SettingsDialog</class>
+ <widget class="QDialog" name="SettingsDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>254</width>
+    <height>165</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Soft Proofing Settings</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QGroupBox" name="softProofingGroupBox">
+     <property name="title">
+      <string>Soft Proofing Settings</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout">
+      <item row="1" column="0">
+       <widget class="QLabel" name="cmsOutputProfileLabel">
+        <property name="text">
+         <string>Proofing profile</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QComboBox" name="cmsProofingColorProfileComboBox"/>
+      </item>
+      <item row="0" column="0">
+       <widget class="QLabel" name="cmsProofingIntentLabel">
+        <property name="text">
+         <string>Proofing intent</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QComboBox" name="cmsProofingIntentComboBox"/>
+      </item>
+      <item row="2" column="0">
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>40</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>SettingsDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>SettingsDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

Pdf4QtViewerPlugins/SoftProofingPlugin/softproofingplugin.cpp

@@ -0,0 +1,141 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of Pdf4Qt.
+//
+//    Pdf4Qt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    Pdf4Qt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "softproofingplugin.h"
+#include "settingsdialog.h"
+
+#include "pdfcms.h"
+#include "pdfutils.h"
+#include "pdfdrawwidget.h"
+
+#include <QAction>
+
+namespace pdfplugin
+{
+
+SoftProofingPlugin::SoftProofingPlugin() :
+    pdf::PDFPlugin(nullptr),
+    m_enableSoftProofingAction(nullptr),
+    m_enableGamutCheckingAction(nullptr),
+    m_showSettingsAction(nullptr),
+    m_isLoadingGUI(false)
+{
+
+}
+
+void SoftProofingPlugin::setWidget(pdf::PDFWidget* widget)
+{
+    Q_ASSERT(!m_widget);
+
+    BaseClass::setWidget(widget);
+
+    m_enableSoftProofingAction = new QAction(QIcon(":/pdfplugins/softproofing/soft-proofing.svg"), tr("Soft Proofing"), this);
+    m_enableGamutCheckingAction = new QAction(QIcon(":/pdfplugins/softproofing/gamut-checking.svg"), tr("Gamut Checking"), this);
+    m_showSettingsAction = new QAction(QIcon(":/pdfplugins/softproofing/settings.svg"), tr("Soft Proofing Settings"), this);
+
+    m_enableSoftProofingAction->setCheckable(true);
+    m_enableGamutCheckingAction->setCheckable(true);
+
+    m_enableSoftProofingAction->setObjectName("actionSoftProofing_EnableSoftProofing");
+    m_enableGamutCheckingAction->setObjectName("actionSoftProofing_EnableGamutChecking");
+    m_showSettingsAction->setObjectName("actionSoftProofing_ShowSettings");
+
+    connect(m_enableSoftProofingAction, &QAction::triggered, this, &SoftProofingPlugin::onSoftProofingTriggered);
+    connect(m_enableGamutCheckingAction, &QAction::triggered, this, &SoftProofingPlugin::onGamutCheckingTriggered);
+    connect(m_showSettingsAction, &QAction::triggered, this, &SoftProofingPlugin::onSettingsTriggered);
+
+    updateActions();
+}
+
+void SoftProofingPlugin::setCMSManager(pdf::PDFCMSManager* manager)
+{
+    BaseClass::setCMSManager(manager);
+
+    connect(manager, &pdf::PDFCMSManager::colorManagementSystemChanged, this, &SoftProofingPlugin::updateActions);
+}
+
+void SoftProofingPlugin::setDocument(const pdf::PDFModifiedDocument& document)
+{
+    BaseClass::setDocument(document);
+
+    if (document.hasReset())
+    {
+        updateActions();
+    }
+}
+
+std::vector<QAction*> SoftProofingPlugin::getActions() const
+{
+    return { m_enableSoftProofingAction, m_enableGamutCheckingAction, m_showSettingsAction };
+}
+
+void SoftProofingPlugin::onSoftProofingTriggered()
+{
+    if (m_isLoadingGUI)
+    {
+        // We are just updating gui, do nothing
+        return;
+    }
+
+    pdf::PDFCMSSettings settings = m_cmsManager->getSettings();
+    settings.isSoftProofing = m_enableSoftProofingAction->isChecked();
+    m_cmsManager->setSettings(settings);
+}
+
+void SoftProofingPlugin::onGamutCheckingTriggered()
+{
+    if (m_isLoadingGUI)
+    {
+        // We are just updating gui, do nothing
+        return;
+    }
+
+    pdf::PDFCMSSettings settings = m_cmsManager->getSettings();
+    settings.isGamutChecking = m_enableGamutCheckingAction->isChecked();
+    m_cmsManager->setSettings(settings);
+}
+
+void SoftProofingPlugin::onSettingsTriggered()
+{
+    SettingsDialog settingsDialog(m_widget, m_cmsManager->getSettings(), m_cmsManager);
+    if (settingsDialog.exec() == SettingsDialog::Accepted)
+    {
+        m_cmsManager->setSettings(settingsDialog.getSettings());
+    }
+}
+
+void SoftProofingPlugin::updateActions()
+{
+    pdf::PDFTemporaryValueChange guard(&m_isLoadingGUI, true);
+
+    if (m_enableSoftProofingAction)
+    {
+        m_enableSoftProofingAction->setEnabled(m_widget);
+        m_enableSoftProofingAction->setChecked(m_cmsManager && m_cmsManager->getSettings().isSoftProofing);
+    }
+    if (m_enableGamutCheckingAction)
+    {
+        m_enableGamutCheckingAction->setEnabled(m_widget);
+        m_enableGamutCheckingAction->setChecked(m_cmsManager && m_cmsManager->getSettings().isGamutChecking);
+    }
+    if (m_showSettingsAction)
+    {
+        m_showSettingsAction->setEnabled(m_widget);
+    }
+}
+
+}

Pdf4QtViewerPlugins/SoftProofingPlugin/softproofingplugin.h

@@ -0,0 +1,60 @@
+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of Pdf4Qt.
+//
+//    Pdf4Qt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    Pdf4Qt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with Pdf4Qt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef SOFTPROOFINGPLUGIN_H
+#define SOFTPROOFINGPLUGIN_H
+
+#include "pdfplugin.h"
+
+#include <QObject>
+
+namespace pdfplugin
+{
+
+class SoftProofingPlugin : public pdf::PDFPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "Pdf4Qt.SoftProofingPlugin" FILE "SoftProofingPlugin.json")
+
+private:
+    using BaseClass = pdf::PDFPlugin;
+
+public:
+    SoftProofingPlugin();
+
+    virtual void setWidget(pdf::PDFWidget* widget) override;
+    virtual void setCMSManager(pdf::PDFCMSManager* manager) override;
+    virtual void setDocument(const pdf::PDFModifiedDocument& document) override;
+    virtual std::vector<QAction*> getActions() const override;
+
+private:
+    void onSoftProofingTriggered();
+    void onGamutCheckingTriggered();
+    void onSettingsTriggered();
+
+    void updateActions();
+
+    QAction* m_enableSoftProofingAction;
+    QAction* m_enableGamutCheckingAction;
+    QAction* m_showSettingsAction;
+
+    bool m_isLoadingGUI;
+};
+
+}   // namespace pdfplugin
+
+#endif // SOFTPROOFINGPLUGIN_H