Deffered SQL query when database is visible

CMakeLists.txt

@@ -17,7 +17,7 @@ if(SANITIZE_ADDRESS_LEAK)
     set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=address -fsanitize=leak")
 endif(SANITIZE_ADDRESS_LEAK)
 
-find_package(Qt6 COMPONENTS Widgets Sql OpenGLWidgets Qml Charts REQUIRED)
+find_package(Qt6 COMPONENTS Widgets Sql OpenGLWidgets Qml Charts Svg REQUIRED)
 find_library(EXIF_LIB exif REQUIRED)
 find_library(FITS_LIB cfitsio REQUIRED)
 find_library(RAW_LIB NAMES raw_r REQUIRED)
@@ -105,7 +105,7 @@ if(STELLARSOLVER_INCLUDE AND STELLARSOLVER_LIB)
     message(STATUS "Found stellarsolver ${STELLARSOLVER_INCLUDE} ${STELLARSOLVER_LIB}")
 endif(STELLARSOLVER_INCLUDE AND STELLARSOLVER_LIB)
 
-target_link_libraries(tenmon PRIVATE Qt6::Widgets Qt6::Sql Qt6::OpenGLWidgets Qt6::Qml Qt6::Charts ${EXIF_LIB} ${FITS_LIB} ${RAW_LIB} ${WCS_LIB} ${LCMS2_LIB} XISF)
+target_link_libraries(tenmon PRIVATE Qt6::Widgets Qt6::Sql Qt6::OpenGLWidgets Qt6::Qml Qt6::Charts Qt6::Svg ${EXIF_LIB} ${FITS_LIB} ${RAW_LIB} ${WCS_LIB} ${LCMS2_LIB} XISF)
 if(APPLE)
     target_link_libraries(tenmon PRIVATE Qt6::DBus "-framework CoreFoundation")
 elseif(UNIX)

README

@@ -2,7 +2,7 @@ FITS/XISF image viewer with multithreaded image loading
 
 To get all dependencies install these packages
 
-    sudo apt install qt6-base-dev qt6-declarative-dev libqt6opengl6-dev libraw-dev libexif-dev libcfitsio-dev wcslib-dev cmake libzstd-dev libqt6sql6-sqlite
+    sudo apt install qt6-base-dev qt6-declarative-dev qt6-charts-dev libqt6opengl6-dev libraw-dev libexif-dev libcfitsio-dev wcslib-dev cmake libzstd-dev libqt6sql6-sqlite
 
 on OpenSUSE
 
@@ -26,6 +26,10 @@ Then to build run standard cmake sequence
     cmake --build build
     ./build/tenmon
 
+To install it to system run this command as root
+
+    cmake --install build
+
 For working plate solving you must have compiled and installed StellarSolver https://github.com/rlancaste/stellarsolver
 It is important that you compile StellarSolver with Qt6. By default it use Qt5 but when linked with Qt6 program it will
 crash.

space.nouspiro.tenmon.metainfo.xml

@@ -47,6 +47,7 @@
     </keywords>
     <url type="homepage">https://nouspiro.space/?page_id=206</url>
     <url type="bugtracker">https://github.com/flathub/space.nouspiro.tenmon/issues</url>
+    <url type="vcs-browser">https://gitea.nouspiro.space/nou/tenmon</url>
     <screenshots>
         <screenshot type="default">
             <caption>Main window with image</caption>
@@ -59,6 +60,23 @@
     </screenshots>
     <content_rating type="oars-1.1"/>
     <releases>
+    <release version="20260217" date="2026-02-17">
+      <description>
+        <ul>
+          <li>Fix potentional crash</li>
+          <li>Enable sorting of FITS info</li>
+        </ul>
+      </description>
+    </release>
+    <release version="20251101" date="2025-11-01">
+      <description>
+        <ul>
+          <li>Better image Save as</li>
+          <li>Fix xisf file corruption when platesolving</li>
+          <li>Add selecting language</li>
+        </ul>
+      </description>
+    </release>
     <release version="20250915" date="2025-09-15">
       <description>
         <ul>

src/batchprocessing.cpp

@@ -113,12 +113,8 @@ BatchProcessing::BatchProcessing(Database *database, QWidget *parent) : QDialog(
 
     _engine = new Script::ScriptEngine(_database, this);
     connect(_engine, &Script::ScriptEngine::newMessage, this, &BatchProcessing::newMessage);
-    QStringList apiList;
+
-    apiList << "core.log" << "core.mark" << "core.unmark" << "core.isMarked" << "core.getObjects" << "core.setMaxthread";
-    apiList << "core.sync" << "core.getString" << "core.getInt" << "core.getFloat" << "core.question" << "core.plot";
-    apiList << "fileName" << "absoluteFileName";
     _completerModel = new QStringListModel(this);
-    _completerModel->setStringList(apiList);
     _completer = new QCompleter(_completerModel, this);
     _ui->consoleLineEdit->setCompleter(_completer);
     connect(_ui->executeButton, &QPushButton::clicked, _ui->consoleLineEdit, &QLineEdit::returnPressed);
@@ -128,13 +124,13 @@ BatchProcessing::BatchProcessing(Database *database, QWidget *parent) : QDialog(
             QString program = _ui->consoleLineEdit->text();
             QJSValue val = _engine->eval(program);
             _ui->consoleLineEdit->addLine();
-            qDebug() << val.toString();
+            //qDebug() << val.toString();
         }
     });
 
     connect(_ui->consoleLineEdit, &QLineEdit::textEdited, [this](const QString &text){
         QStringList comp = _engine->complete(text);
-        qDebug() << comp;
+        //qDebug() << comp;
         _completerModel->setStringList(comp);
     });
 

src/database.cpp

@@ -307,6 +307,11 @@ QVector<SkyObject> Database::getObjects(double minRa, double maxRa, double minDe
     return objects;
 }
 
+const QSqlDatabase &Database::db() const
+{
+    return database;
+}
+
 bool Database::indexDir2(const QDir &dir, QProgressDialog *progress, QStringList &scannedDirs)
 {
     if(scannedDirs.contains(dir.canonicalPath()))return true;

src/database.h

@@ -42,6 +42,7 @@ public:
     void reindex(QProgressDialog *progress);
     QStringList getFitsKeywords();
     QVector<SkyObject> getObjects(double minRa, double maxRa, double minDec, double maxDec);
+    const QSqlDatabase& db() const;
 protected:
     bool indexDir2(const QDir &dir, QProgressDialog *progress, QStringList &scannedDirs);
     bool indexFile(const QFileInfo &file);

src/databaseview.cpp

@@ -157,32 +157,67 @@ void FITSFileModel::filesUnmarked(const QModelIndexList &indexes)
     }
 }
 
+void FITSFileModel::load()
+{
+    if(!m_loaded)
+    {
+        m_loaded = true;
+        prepareQuery();
+    }
+}
+
 void FITSFileModel::prepareQuery()
 {
+    if(!m_loaded)return;
+
     QString cols;
     QString join;
     QStringList where;
     QString sql = m_columns.size() ? "SELECT f.file," : "SELECT f.file";
+    QVariantList bindValues;
+    QVariantList bindValuesJoin;
     for(int i=0; i<m_value.size(); i++)
     {
         if(m_key[i] == "file")
-            where.append(QString(" f.file LIKE '%1' ").arg(m_value[i]));
+        {
+            where.append(" f.file LIKE ? ");
+            bindValues.append(m_value[i]);
+        }
         else if(m_key[i] == "RA pos")
-            where.append(QString(" %1 BETWEEN f.minRa AND f.maxRa ").arg(RA(m_value[i])));
+        {
+            where.append(" ? BETWEEN f.minRa AND f.maxRa ");
+            bindValues.append(RA(m_value[i]));
+        }
         else if(m_key[i] == "DEC pos")
-            where.append(QString(" %1 BETWEEN f.minDec AND f.maxDec ").arg(DEC(m_value[i])));
+        {
+            where.append(" ? BETWEEN f.minDec AND f.maxDec ");
+            bindValues.append(DEC(m_value[i]));
+        }
         else if(m_key[i] == "RA range")
-            where.append(QString(" crVal1 BETWEEN %1 AND %2 ").arg(RA(m_value[i])).arg(RA(m_limit[i])));
+        {
+            where.append(" crVal1 BETWEEN ? AND ? ");
+            bindValues.append(RA(m_value[i]));
+            bindValues.append(RA(m_limit[i]));
+        }
         else if(m_key[i] == "DEC range")
-            where.append(QString(" crVal2 BETWEEN %1 AND %2 ").arg(DEC(m_value[i])).arg(DEC(m_limit[i])));
+        {
+            where.append(" crVal2 BETWEEN ? AND ? ");
+            bindValues.append(DEC(m_value[i]));
+            bindValues.append(DEC(m_limit[i]));
+        }
         else
-            join += QString(" JOIN fits_headers AS s%1 ON f.id=s%1.id_file AND s%1.key='%2' AND s%1.value LIKE '%3'").arg(i).arg(m_key[i]).arg(m_value[i]);
+        {
+            join += QString(" JOIN fits_headers AS s%1 ON f.id=s%1.id_file AND s%1.key=? AND s%1.value LIKE ? ").arg(i);
+            bindValuesJoin.append(m_key[i]);
+            bindValuesJoin.append(m_value[i]);
+        }
     }
     int i=0;
     for(auto &column : m_columns)
     {
         cols += QString("GROUP_CONCAT(h%1.value) AS h%1_value,").arg(i);
-        join += QString(" LEFT JOIN fits_headers AS h%1 ON f.id=h%1.id_file AND h%1.key='%2'").arg(i).arg(column);
+        join += QString(" LEFT JOIN fits_headers AS h%1 ON f.id=h%1.id_file AND h%1.key=?").arg(i);
+        bindValuesJoin.append(column);
         i++;
     }
     cols.chop(1);
@@ -191,7 +226,18 @@ void FITSFileModel::prepareQuery()
     sql += join;
     if(!where.isEmpty())sql += " WHERE " + where.join("AND");
     sql += " GROUP BY f.id" + m_sort;
-    setQuery(sql);
+
+    QSqlQuery query(m_database->db());
+    query.prepare(sql);
+    for(auto &val : bindValuesJoin)
+        query.addBindValue(val);
+    for(auto &val : bindValues)
+        query.addBindValue(val);
+
+    if(!query.exec())
+        qWarning() << "Failed to exectute query" << query.lastQuery() << bindValuesJoin << bindValues;
+    setQuery(std::move(query));
+
     setHeaderData(0, Qt::Horizontal, tr("File name"));
     i = 1;
     for(auto &column : m_columns)
@@ -392,6 +438,7 @@ bool DataBaseView::exportCSV(const QString &path)
     if(!csv.open(QIODevice::WriteOnly | QIODevice::Text))
         return false;
 
+    m_model->load();
     QSqlQuery sql(m_model->query().lastQuery());
     int colCount = m_model->columnCount();
     QStringList header;
@@ -420,3 +467,8 @@ bool DataBaseView::exportCSV(const QString &path)
     }
     return true;
 }
+
+void DataBaseView::visible(bool visible)
+{
+    if(visible)m_model->load();
+}

src/databaseview.h

@@ -30,6 +30,7 @@ class FITSFileModel : public QSqlQueryModel
     QStringList m_limit;
     QSet<QString> m_markedFiles;
     Database *m_database;
+    bool m_loaded = false;
 public:
     explicit FITSFileModel(Database *database, QObject *parent = nullptr);
     void sort(int column, Qt::SortOrder order) override;
@@ -38,6 +39,7 @@ public:
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     void filesMarked(const QModelIndexList &indexes);
     void filesUnmarked(const QModelIndexList &indexes);
+    void load();
 protected:
     void prepareQuery();
 };
@@ -74,6 +76,7 @@ public slots:
     void itemActivated(const QModelIndex &index);
     void applyFilter();
     bool exportCSV(const QString &path);
+    void visible(bool visible);
 signals:
     void loadFile(QString file);
 };

src/imageinfo.cpp

@@ -11,6 +11,8 @@ ImageInfo::ImageInfo(QWidget *parent) : QTreeWidget(parent)
     setIndentation(5);
     QSettings settings;
     header()->restoreState(settings.value("imageinfo/headerstate").toByteArray());
+    setSortingEnabled(true);
+    header()->setSortIndicatorClearable(true);
 }
 
 ImageInfo::~ImageInfo()

src/imageringlist.cpp

@@ -111,7 +111,7 @@ void Image::thumbnailLoadFinish(std::shared_ptr<RawImage> rawImage)
         emit thumbnailLoaded(this);
 }
 
-ImageRingList::ImageRingList(Database *database, const QStringList &nameFilter, QObject *parent) : QAbstractItemModel(parent)
+ImageRingList::ImageRingList(Database *database, const QStringList &nameFilter, QObject *parent) : QAbstractListModel(parent)
   , m_liveMode(false)
   , m_analyzeLevel(None)
   , m_database(database)
@@ -412,7 +412,7 @@ void ImageRingList::clearThumbnails()
         img->clearThumbnail();
 }
 
-QModelIndex ImageRingList::index(int row, int column, const QModelIndex &parent) const
+/*QModelIndex ImageRingList::index(int row, int column, const QModelIndex &parent) const
 {
     Q_UNUSED(parent);
     return createIndex(row, column, m_images.at(row).get());
@@ -422,7 +422,7 @@ QModelIndex ImageRingList::parent(const QModelIndex &child) const
 {
     Q_UNUSED(child);
     return QModelIndex();
-}
+}*/
 
 int ImageRingList::rowCount(const QModelIndex &parent) const
 {
@@ -432,13 +432,15 @@ int ImageRingList::rowCount(const QModelIndex &parent) const
         return 0;
 }
 
-int ImageRingList::columnCount(const QModelIndex &parent) const
+/*int ImageRingList::columnCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent);
     return 1;
-}
+}*/
 
 QVariant ImageRingList::data(const QModelIndex &index, int role) const
+{
+    if(index.isValid() && index.row() >= 0 && index.row() < m_images.size())
     {
         switch(role)
         {
@@ -458,6 +460,8 @@ QVariant ImageRingList::data(const QModelIndex &index, int role) const
             return QVariant();
         }
     }
+    return QVariant();
+}
 
 QVariant ImageRingList::headerData(int section, Qt::Orientation orientation, int role) const
 {

src/imageringlist.h

@@ -51,7 +51,7 @@ typedef std::shared_ptr<Image> ImagePtr;
 
 class Database;
 
-class ImageRingList : public QAbstractItemModel
+class ImageRingList : public QAbstractListModel
 {
     Q_OBJECT
     int m_width;
@@ -93,10 +93,10 @@ public:
     void updateMark();
     void clearThumbnails();
 
-    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
+    //QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
-    QModelIndex parent(const QModelIndex &child) const override;
+    //QModelIndex parent(const QModelIndex &child) const override;
     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+    //int columnCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
 public slots:

src/loadrunable.cpp

@@ -193,7 +193,11 @@ void ConvertRunable::run()
     QFileInfo info(m_outfile);
     info.dir().mkpath(".");
 
-    if(m_params.autostretch)
+    if(m_params.stretch)
+    {
+        rawimage->applySTF(m_params.mtf);
+    }
+    else if(m_params.autostretch)
     {
         rawimage->calcStats();
         MTFParam mtfParam = rawimage->calcMTFParams();

src/loadrunable.h

@@ -6,6 +6,7 @@
 #include <QSemaphore>
 #include <QSize>
 #include "imageinfodata.h"
+#include "mtfparam.h"
 
 class Image;
 
@@ -33,6 +34,8 @@ public:
         QSize resize;
         Qt::AspectRatioMode aspect = Qt::KeepAspectRatio;
         bool autostretch = false;
+        bool stretch = false;
+        MTFParam mtf;
         ConvertParams(){}
         ConvertParams(const QVariantMap &map);
     };

src/main.cpp

@@ -3,6 +3,7 @@
 #include <QSurfaceFormat>
 #include <QTranslator>
 #include <QCommandLineParser>
+#include <QSettings>
 #include <stdlib.h>
 #include "../thumbnailer/genthumbnail.h"
 
@@ -76,8 +77,19 @@ int main(int argc, char *argv[])
 
     QTranslator translator;
     QTranslator translator2;
+    QSettings settings;
+    QString lang = settings.value("settings/lang").toString();
+    if(lang.isEmpty())
+    {
         if(translator.load(QLocale(), "tenmon", "_", ":/translations"))
             a.installTranslator(&translator);
+    }
+    else
+    {
+        if(translator.load("tenmon_" + lang, ":/translations"))
+            a.installTranslator(&translator);
+    }
+
     if(translator2.load(QLocale(), "tenmon", "_", a.applicationDirPath()))
         a.installTranslator(&translator2);
 

src/mainwindow.cpp

@@ -18,6 +18,7 @@
 #include <QThreadPool>
 #include <QStatusBar>
 #include <QImageReader>
+#include <QImageWriter>
 #include <QMimeDatabase>
 #include <QDesktopServices>
 #include <QJsonDocument>
@@ -57,12 +58,18 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     for(auto format : supportedFormats)
     {
         QMimeType mimeType = db.mimeTypeForName(format);
-        _saveFilter.append(mimeType.filterString() + ";;");
         _openFilter.append("*.");
         _openFilter.append(mimeType.suffixes().join(" *."));
         _openFilter.append(" ");
         nameFilter.append(mimeType.suffixes());
     }
+    auto supportedWrite = QImageWriter::supportedMimeTypes();
+    for(auto format : supportedWrite)
+    {
+        QMimeType mimeType = db.mimeTypeForName(format);
+        _saveFilter.append(mimeType.filterString() + ";;");
+    }
+
     _openFilter.append("*.fit *.fits *.fts *.fz *.xisf *.cr2 *.cr3 *.nef *.dng)");
     _openFilter.append(tr(";;All files (*)"));
     nameFilter.append({"fit", "fits", "fts", "fz", "xisf", "cr2", "cr3", "nef", "dng"});
@@ -189,7 +196,12 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
 #endif
     fileMenu->addAction(tr("Copy marked files"), Qt::Key_F5, this, &MainWindow::copyMarked);
     fileMenu->addAction(tr("Move marked files"), Qt::Key_F6, this, &MainWindow::moveMarked);
-    fileMenu->addAction(tr("Move marked files to trash"), QKeySequence::Delete, this, &MainWindow::deleteMarked);
+    QAction *deleteAction = fileMenu->addAction(tr("Move marked files to trash"), QKeySequence::Delete, this, &MainWindow::deleteMarked);
+#ifdef Q_OS_MACOS
+    deleteAction->setShortcuts(QList<QKeySequence>({Qt::Key_Backspace, QKeySequence::Delete}));
+#else
+    deleteAction->setShortcuts(QKeySequence::Delete);
+#endif
     fileMenu->addSeparator();
     fileMenu->addAction(tr("Index directory"), this, static_cast<void (MainWindow::*)()>(&MainWindow::indexDir));
     fileMenu->addAction(tr("Reindex files"), this, &MainWindow::reindex);
@@ -613,12 +625,16 @@ void MainWindow::reindex()
 void MainWindow::saveAs()
 {
     QString selectedFilter;
+    ImagePtr ptr = m_ringList->currentImage();
+    if(!ptr)return;
+
+    QFileInfo srcFile(ptr->name());
     QString file = QFileDialog::getSaveFileName(this,
                                  tr("Save as"),
-                                 _lastDir,
+                                 _lastDir + "/" + srcFile.baseName(),
                                  _saveFilter,
                                  &selectedFilter);
-    auto filterToFormat = [](const QString &file, const QString &filter) -> const char*
+    auto filterToFormat = [](const QString &file, const QString &filter) -> const QString
     {
         QString suffix = QFileInfo(file).suffix();
         if(!suffix.compare("jpg", Qt::CaseInsensitive) || !suffix.compare("jpeg", Qt::CaseInsensitive))return "jpeg";
@@ -628,30 +644,31 @@ void MainWindow::saveAs()
         if(filter.contains("png"))return "png";
         if(filter.contains("fits"))return "fits";
         if(filter.contains("xisf"))return "xisf";
+        QRegularExpression suf("\\(\\*\\.([a-zA-Z]+).*\\)");
+        auto match = suf.match(filter);
+        if(match.hasMatch())
+            return match.captured(1);
         return "jpeg";
     };
 
     if(!file.isEmpty())
     {
+        auto button = QMessageBox::question(this, tr("Apply stretch?"), tr("Apply current stretch function to image?"));
+
         QString format = filterToFormat(file, selectedFilter);
 
-        if(format == "fits" || format == "xisf")
+        convert(file, format, button == QMessageBox::Yes);
-        {
-            convert(file, format);
-        }
-        else
-        {
-            QImage img = m_image->renderToImage();
-            if(!img.isNull())
-                img.save(file, filterToFormat(file, selectedFilter));
-        }
     }
 }
 
-void MainWindow::convert(const QString &outfile, const QString &format)
+void MainWindow::convert(const QString &outfile, const QString &format, bool stretch)
 {
     QString file = m_ringList->currentImage()->name();
-    QThreadPool::globalInstance()->start(new ConvertRunable(file, outfile, format));
+    ConvertRunable::ConvertParams param;
+    param.stretch = stretch;
+    param.mtf = m_stretchPanel->params();
+
+    QThreadPool::globalInstance()->start(new ConvertRunable(file, outfile, format, param));
 }
 
 void MainWindow::markImage()

src/mainwindow.h

@@ -52,7 +52,7 @@ public slots:
     void indexDir(const QString &dir);
     void reindex();
     void saveAs();
-    void convert(const QString &outfile, const QString &format);
+    void convert(const QString &outfile, const QString &format, bool stretch);
     void markImage();
     void unmarkImage();
     void markAndNext();

src/rawimage.cpp

@@ -1195,6 +1195,21 @@ void RawImage::applySTF(const MTFParam &mtfParams)
         for(size_t i = 0; i < len; i++)
         {
             float x;
+            if(m_ch == 4)
+            {
+                size_t c = i & 0x3;
+                if(c < 3)
+                {
+                    if constexpr(std::numeric_limits<std::remove_reference_t<decltype(*src)>>::is_integer)x = src[i] * iscale;
+                    else x = src[i] * unit.first + unit.second;
+                    x = (x - mtfParams.blackPoint[c]) / (mtfParams.whitePoint[c] - mtfParams.blackPoint[c]);
+                    x = std::clamp(x, 0.0f, 1.0f);
+                    x = ((mtfParams.midPoint[c] - 1.0f) * x) / ((2.0f * mtfParams.midPoint[c] - 1.0f) * x - mtfParams.midPoint[c]);
+                    src[i] = x * s;
+                }
+            }
+            else
+            {
                 if constexpr(std::numeric_limits<std::remove_reference_t<decltype(*src)>>::is_integer)x = src[i] * iscale;
                 else x = src[i] * unit.first + unit.second;
                 x = (x - mtfParams.blackPoint[0]) / (mtfParams.whitePoint[0] - mtfParams.blackPoint[0]);
@@ -1202,6 +1217,7 @@ void RawImage::applySTF(const MTFParam &mtfParams)
                 x = ((mtfParams.midPoint[0] - 1.0f) * x) / ((2.0f * mtfParams.midPoint[0] - 1.0f) * x - mtfParams.midPoint[0]);
                 src[i] = x * s;
             }
+        }
     };
 
     switch(m_type)

src/settingsdialog.cpp

@@ -129,11 +129,30 @@ SettingsDialog::SettingsDialog(QWidget *parent) : QDialog(parent)
             delete item;
     });
 
+    m_lang = new QComboBox(this);
+    m_lang->addItems({"English", "Français", "Slovenčina", "Português"});
+    QString lang;
+    switch(QLocale().language())
+    {
+    default:
+    case QLocale::English: lang = "en"; break;
+    case QLocale::French: lang = "fr"; break;
+    case QLocale::Slovak: lang = "sk"; break;
+    case QLocale::Portuguese: lang = "pt_BR"; break;
+    }
+
+    lang = settings.value("settings/lang", lang).toString();
+    if(lang == "en")m_lang->setCurrentIndex(0);
+    else if(lang == "fr")m_lang->setCurrentIndex(1);
+    else if(lang == "sk")m_lang->setCurrentIndex(2);
+    else if(lang == "pt_BR")m_lang->setCurrentIndex(3);
+
     layout->addRow(tr("Image preload count"), m_preloadImages);
     layout->addRow(tr("Thumbnails size"), m_thumSize);
     layout->addRow(tr("Saturation"), m_saturation);
     layout->addRow(tr("Slideshow interval"), m_slideShowTime);
     layout->addRow(tr("Image interpolation"), m_filtering);
+    layout->addRow(tr("Language"), m_lang);
     layout->addRow(m_qualityThumbnail);
     layout->addRow(m_useNativeDialog);
     layout->addRow(m_bestFit);
@@ -150,7 +169,6 @@ SettingsDialog::SettingsDialog(QWidget *parent) : QDialog(parent)
 #endif
     //layout->addRow(new QLabel(tr("Changes in settings will take effect after program restart.")));
 
-
     QDialogButtonBox *buttonBox = new QDialogButtonBox(this);
     buttonBox->setStandardButtons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
     connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
@@ -237,4 +255,14 @@ void SettingsDialog::saveSettings()
     }
     settings.setValue("settings/headerhighlightkeywords", headerHighlight.keys());
     settings.setValue("settings/headerhighlightcolors", colors);
+    QString lang;
+    int langIdx = m_lang->currentIndex();
+    switch(langIdx)
+    {
+    case 0: lang = "en"; break;
+    case 1: lang = "fr"; break;
+    case 2: lang = "sk"; break;
+    case 3: lang = "pt_BR"; break;
+    }
+    settings.setValue("settings/lang", lang);
 }

src/settingsdialog.h

@@ -32,6 +32,7 @@ private:
     QListWidget *m_headerHighlight;
     QColor m_color = Qt::yellow;
     QLineEdit *m_keyword;
+    QComboBox *m_lang;
 };
 
 #endif // SETTINGSDIALOG_H

src/stretchtoolbar.cpp

@@ -104,6 +104,11 @@ StretchToolbar::~StretchToolbar()
     settings.setValue("stretchtoolbar/autostretch", m_autoStretchOnLoad->isChecked());
 }
 
+const MTFParam &StretchToolbar::params() const
+{
+    return m_mtfParam;
+}
+
 void StretchToolbar::stretchImage(Image *img)
 {
     if(img && img->rawImage())

src/stretchtoolbar.h

@@ -22,6 +22,7 @@ class StretchToolbar : public QToolBar
 public:
     explicit StretchToolbar(QWidget *parent = nullptr);
     ~StretchToolbar();
+    const MTFParam& params() const;
 public slots:
     void stretchImage(Image *img);
     void resetMTF();