Get rid of all instance usage of QFontDatabase

All QFontDatabase APIs are static, use them accordingly.

Task-number: QTBUG-88114
Change-Id: I0e4a7508646037e6e2812611262eed8b6d7ad3de
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

18 files changed, 94 insertions, 140 deletions

diff --git a/examples/widgets/painting/fontsampler/mainwindow.cpp b/examples/widgets/painting/fontsampler/mainwindow.cpp
index 65a186099d..33f6f9a927 100644
--- a/examples/widgets/painting/fontsampler/mainwindow.cpp
+++ b/examples/widgets/painting/fontsampler/mainwindow.cpp
@@ -84,13 +84,12 @@ MainWindow::MainWindow(QWidget *parent)
 
 void MainWindow::setupFontTree()
 {
-    QFontDatabase database;
     fontTree->setColumnCount(1);
     fontTree->setHeaderLabels({ tr("Font") });
 
-    const QStringList fontFamilies = database.families();
+    const QStringList fontFamilies = QFontDatabase::families();
     for (const QString &family : fontFamilies) {
-        const QStringList styles = database.styles(family);
+        const QStringList styles = QFontDatabase::styles(family);
         if (styles.isEmpty())
             continue;
 
@@ -103,8 +102,8 @@ void MainWindow::setupFontTree()
             QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);
             styleItem->setText(0, style);
             styleItem->setCheckState(0, Qt::Unchecked);
-            styleItem->setData(0, Qt::UserRole, QVariant(database.weight(family, style)));
-            styleItem->setData(0, Qt::UserRole + 1, QVariant(database.italic(family, style)));
+            styleItem->setData(0, Qt::UserRole, QVariant(QFontDatabase::weight(family, style)));
+            styleItem->setData(0, Qt::UserRole + 1, QVariant(QFontDatabase::italic(family, style)));
         }
     }
 }
diff --git a/examples/widgets/widgets/charactermap/characterwidget.cpp b/examples/widgets/widgets/charactermap/characterwidget.cpp
index 422177ffa8..a9d5a06164 100644
--- a/examples/widgets/widgets/charactermap/characterwidget.cpp
+++ b/examples/widgets/widgets/charactermap/characterwidget.cpp
@@ -86,9 +86,8 @@ void CharacterWidget::updateSize(const QString &fontSize)
 
 void CharacterWidget::updateStyle(const QString &fontStyle)
 {
-    QFontDatabase fontDatabase;
     const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy();
-    displayFont = fontDatabase.font(displayFont.family(), fontStyle, displayFont.pointSize());
+    displayFont = QFontDatabase::font(displayFont.family(), fontStyle, displayFont.pointSize());
     displayFont.setStyleStrategy(oldStrategy);
     calculateSquareSize();
     adjustSize();
diff --git a/examples/widgets/widgets/charactermap/mainwindow.cpp b/examples/widgets/widgets/charactermap/mainwindow.cpp
index 18dc672c37..cfe0be96ca 100644
--- a/examples/widgets/widgets/charactermap/mainwindow.cpp
+++ b/examples/widgets/widgets/charactermap/mainwindow.cpp
@@ -178,13 +178,12 @@ MainWindow::MainWindow(QWidget *parent)
 //! [7]
 void MainWindow::findStyles(const QFont &font)
 {
-    QFontDatabase fontDatabase;
     QString currentItem = styleCombo->currentText();
     styleCombo->clear();
 //! [7]
 
 //! [8]
-    const QStringList styles = fontDatabase.styles(font.family());
+    const QStringList styles = QFontDatabase::styles(font.family());
     for (const QString &style : styles)
         styleCombo->addItem(style);
 
@@ -207,7 +206,6 @@ void MainWindow::filterChanged(int f)
 
 void MainWindow::findSizes(const QFont &font)
 {
-    QFontDatabase fontDatabase;
     QString currentSize = sizeCombo->currentText();
 
     {
@@ -215,7 +213,7 @@ void MainWindow::findSizes(const QFont &font)
         // sizeCombo signals are now blocked until end of scope
         sizeCombo->clear();
 
-        if (fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) {
+        if (QFontDatabase::isSmoothlyScalable(font.family(), QFontDatabase::styleString(font))) {
             const QList<int> sizes = QFontDatabase::standardSizes();
             for (const int size : sizes) {
                 sizeCombo->addItem(QVariant(size).toString());
@@ -223,7 +221,7 @@ void MainWindow::findSizes(const QFont &font)
             }
 
         } else {
-            const QList<int> sizes = fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font));
+            const QList<int> sizes = QFontDatabase::smoothSizes(font.family(), QFontDatabase::styleString(font));
             for (const int size : sizes ) {
                 sizeCombo->addItem(QVariant(size).toString());
                 sizeCombo->setEditable(false);
diff --git a/src/gui/doc/snippets/qfontdatabase/qfontdatabase_snippets.cpp b/src/gui/doc/snippets/qfontdatabase/qfontdatabase_snippets.cpp
index 3200ac94b1..abcff4211a 100644
--- a/src/gui/doc/snippets/qfontdatabase/qfontdatabase_snippets.cpp
+++ b/src/gui/doc/snippets/qfontdatabase/qfontdatabase_snippets.cpp
@@ -54,23 +54,22 @@ namespace qfontdatabase_snippets {
 void wrapper()
 {
 //! [0]
-QFontDatabase database;
 QTreeWidget fontTree;
 fontTree.setColumnCount(2);
 fontTree.setHeaderLabels(QStringList() << "Font" << "Smooth Sizes");
 
-const QStringList fontFamilies = database.families();
+const QStringList fontFamilies = QFontDatabase::families();
 for (const QString &family : fontFamilies) {
     QTreeWidgetItem *familyItem = new QTreeWidgetItem(&fontTree);
     familyItem->setText(0, family);
 
-    const QStringList fontStyles = database.styles(family);
+    const QStringList fontStyles = QFontDatabase::styles(family);
     for (const QString &style : fontStyles) {
         QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);
         styleItem->setText(0, style);
 
         QString sizes;
-        const QList<int> smoothSizes = database.smoothSizes(family, style);
+        const QList<int> smoothSizes = QFontDatabase::smoothSizes(family, style);
         for (const auto &points : smoothSizes)
             sizes += QString::number(points) + ' ';
 
diff --git a/src/gui/text/windows/qwindowsfontdatabasebase.cpp b/src/gui/text/windows/qwindowsfontdatabasebase.cpp
index 9a7c1c3578..b84fe20c93 100644
--- a/src/gui/text/windows/qwindowsfontdatabasebase.cpp
+++ b/src/gui/text/windows/qwindowsfontdatabasebase.cpp
@@ -927,8 +927,7 @@ static const char **tryFonts = nullptr;
 QStringList QWindowsFontDatabaseBase::extraTryFontsForFamily(const QString &family)
 {
     QStringList result;
-    QFontDatabase db;
-    if (!db.writingSystems(family).contains(QFontDatabase::Symbol)) {
+    if (!QFontDatabase::writingSystems(family).contains(QFontDatabase::Symbol)) {
         if (!tryFonts) {
             LANGID lid = GetUserDefaultLangID();
             switch (lid&0xff) {
@@ -949,13 +948,12 @@ QStringList QWindowsFontDatabaseBase::extraTryFontsForFamily(const QString &fami
                 break;
             }
         }
-        QFontDatabase db;
-        const QStringList families = db.families();
+        const QStringList families = QFontDatabase::families();
         const char **tf = tryFonts;
         while (tf && *tf) {
             // QTBUG-31689, family might be an English alias for a localized font name.
             const QString family = QString::fromLatin1(*tf);
-            if (families.contains(family) || db.hasFamily(family))
+            if (families.contains(family) || QFontDatabase::hasFamily(family))
                 result << family;
             ++tf;
         }
diff --git a/src/plugins/platforms/wasm/qwasmtheme.cpp b/src/plugins/platforms/wasm/qwasmtheme.cpp
index 4b99f90591..438e3e1119 100644
--- a/src/plugins/platforms/wasm/qwasmtheme.cpp
+++ b/src/plugins/platforms/wasm/qwasmtheme.cpp
@@ -35,9 +35,8 @@ QT_BEGIN_NAMESPACE
 
 QWasmTheme::QWasmTheme()
 {
-    QFontDatabase fdb;
-    for (auto family : fdb.families())
-        if (fdb.isFixedPitch(family))
+    for (auto family : QFontDatabase::families())
+        if (QFontDatabase::isFixedPitch(family))
             fixedFont = new QFont(family);
 }
 
diff --git a/src/widgets/dialogs/qfontdialog.cpp b/src/widgets/dialogs/qfontdialog.cpp
index 8e42804943..7dc5566b70 100644
--- a/src/widgets/dialogs/qfontdialog.cpp
+++ b/src/widgets/dialogs/qfontdialog.cpp
@@ -486,20 +486,18 @@ void QFontDialogPrivate::updateFamilies()
     const QFontDialog::FontDialogOptions spacingMask = (QFontDialog::ProportionalFonts | QFontDialog::MonospacedFonts);
     const QFontDialog::FontDialogOptions options = q->options();
 
-    QFontDatabase fdb;
-
     QStringList familyNames;
-    const auto families = fdb.families(writingSystem);
+    const auto families = QFontDatabase::families(writingSystem);
     for (const QString &family : families) {
-        if (fdb.isPrivateFamily(family))
+        if (QFontDatabase::isPrivateFamily(family))
             continue;
 
         if ((options & scalableMask) && (options & scalableMask) != scalableMask) {
-            if (bool(options & QFontDialog::ScalableFonts) != fdb.isSmoothlyScalable(family))
+            if (bool(options & QFontDialog::ScalableFonts) != QFontDatabase::isSmoothlyScalable(family))
                 continue;
         }
         if ((options & spacingMask) && (options & spacingMask) != spacingMask) {
-            if (bool(options & QFontDialog::MonospacedFonts) != fdb.isFixedPitch(family))
+            if (bool(options & QFontDialog::MonospacedFonts) != QFontDatabase::isFixedPitch(family))
                 continue;
         }
         familyNames << family;
@@ -564,7 +562,7 @@ void QFontDialogPrivate::updateFamilies()
 void QFontDialogPrivate::updateStyles()
 {
     Q_Q(QFontDialog);
-    QStringList styles = fdb.styles(familyList->currentText());
+    QStringList styles = QFontDatabase::styles(familyList->currentText());
     styleList->model()->setStringList(styles);
 
     if (styles.isEmpty()) {
@@ -606,7 +604,7 @@ void QFontDialogPrivate::updateStyles()
                 && styleList->hasFocus())
             styleEdit->selectAll();
 
-        smoothScalable = fdb.isSmoothlyScalable(familyList->currentText(), styleList->currentText());
+        smoothScalable = QFontDatabase::isSmoothlyScalable(familyList->currentText(), styleList->currentText());
     }
 
     updateSizes();
@@ -623,7 +621,7 @@ void QFontDialogPrivate::updateSizes()
     Q_Q(QFontDialog);
 
     if (!familyList->currentText().isEmpty()) {
-        QList<int> sizes = fdb.pointSizes(familyList->currentText(), styleList->currentText());
+        QList<int> sizes = QFontDatabase::pointSizes(familyList->currentText(), styleList->currentText());
 
         int i = 0;
         int current = -1;
@@ -655,7 +653,7 @@ void QFontDialogPrivate::_q_updateSample()
 {
     // compute new font
     int pSize = sizeEdit->text().toInt();
-    QFont newFont(fdb.font(familyList->currentText(), style, pSize));
+    QFont newFont(QFontDatabase::font(familyList->currentText(), style, pSize));
     newFont.setStrikeOut(strikeout->isChecked());
     newFont.setUnderline(underline->isChecked());
 
@@ -807,7 +805,7 @@ void QFontDialog::setCurrentFont(const QFont &font)
 {
     Q_D(QFontDialog);
     d->family = font.family();
-    d->style = d->fdb.styleString(font);
+    d->style = QFontDatabase::styleString(font);
     d->size = font.pointSize();
     if (d->size == -1) {
         QFontInfo fi(font);
diff --git a/src/widgets/dialogs/qfontdialog_p.h b/src/widgets/dialogs/qfontdialog_p.h
index 202247a3b4..73c17c3708 100644
--- a/src/widgets/dialogs/qfontdialog_p.h
+++ b/src/widgets/dialogs/qfontdialog_p.h
@@ -130,7 +130,6 @@ public:
 
     QDialogButtonBox *buttonBox;
 
-    QFontDatabase fdb;
     QString family;
     QFontDatabase::WritingSystem writingSystem;
     QString style;
diff --git a/src/widgets/widgets/qfontcombobox.cpp b/src/widgets/widgets/qfontcombobox.cpp
index 4b3003a6f3..bd96aa2768 100644
--- a/src/widgets/widgets/qfontcombobox.cpp
+++ b/src/widgets/widgets/qfontcombobox.cpp
@@ -320,23 +320,22 @@ void QFontComboBoxPrivate::_q_updateModel()
     QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(q->view()->itemDelegate());
     QFontDatabase::WritingSystem system = delegate ? delegate->writingSystem : QFontDatabase::Any;
 
-    QFontDatabase fdb;
-    QStringList list = fdb.families(system);
+    QStringList list = QFontDatabase::families(system);
     QStringList result;
 
     int offset = 0;
     QFontInfo fi(currentFont);
 
     for (int i = 0; i < list.size(); ++i) {
-        if (fdb.isPrivateFamily(list.at(i)))
+        if (QFontDatabase::isPrivateFamily(list.at(i)))
             continue;
 
         if ((filters & scalableMask) && (filters & scalableMask) != scalableMask) {
-            if (bool(filters & QFontComboBox::ScalableFonts) != fdb.isSmoothlyScalable(list.at(i)))
+            if (bool(filters & QFontComboBox::ScalableFonts) != QFontDatabase::isSmoothlyScalable(list.at(i)))
                 continue;
         }
         if ((filters & spacingMask) && (filters & spacingMask) != spacingMask) {
-            if (bool(filters & QFontComboBox::MonospacedFonts) != fdb.isFixedPitch(list.at(i)))
+            if (bool(filters & QFontComboBox::MonospacedFonts) != QFontDatabase::isFixedPitch(list.at(i)))
                 continue;
         }
         result += list.at(i);
diff --git a/tests/auto/gui/text/qfont/tst_qfont.cpp b/tests/auto/gui/text/qfont/tst_qfont.cpp
index d651ffe7c7..4cc5a81329 100644
--- a/tests/auto/gui/text/qfont/tst_qfont.cpp
+++ b/tests/auto/gui/text/qfont/tst_qfont.cpp
@@ -131,14 +131,13 @@ void tst_QFont::exactMatch()
     QVERIFY(!QFont("monospace").exactMatch());
 
     // Confirm that exactMatch is true for a valid font
-    QFontDatabase db;
-    const QString family = db.families().first();
-    const QString style = db.styles(family).first();
-    const int pointSize = db.pointSizes(family, style).first();
-    font = db.font(family, style, pointSize);
+    const QString family = QFontDatabase::families().first();
+    const QString style = QFontDatabase::styles(family).first();
+    const int pointSize = QFontDatabase::pointSizes(family, style).first();
+    font = QFontDatabase::font(family, style, pointSize);
     QVERIFY(font.exactMatch());
 
-    if (db.families().contains("Arial")) {
+    if (QFontDatabase::families().contains("Arial")) {
         font = QFont("Arial");
         QVERIFY(font.exactMatch());
         font = QFont(QString());
@@ -149,9 +148,7 @@ void tst_QFont::exactMatch()
 
 void tst_QFont::italicOblique()
 {
-    QFontDatabase fdb;
-
-    QStringList families = fdb.families();
+    QStringList families = QFontDatabase::families();
     if (families.isEmpty())
         return;
 
@@ -159,12 +156,12 @@ void tst_QFont::italicOblique()
     for (f_it = families.begin(); f_it != f_end; ++f_it) {
 
         QString family = *f_it;
-        QStringList styles = fdb.styles(family);
+        QStringList styles = QFontDatabase::styles(family);
         QStringList::ConstIterator s_it, s_end = styles.end();
         for (s_it = styles.begin(); s_it != s_end; ++s_it) {
             QString style = *s_it;
 
-            if (fdb.isSmoothlyScalable(family, style)) {
+            if (QFontDatabase::isSmoothlyScalable(family, style)) {
                 if (style.contains("Oblique")) {
                     style.replace("Oblique", "Italic");
                 } else if (style.contains("Italic")) {
@@ -172,7 +169,7 @@ void tst_QFont::italicOblique()
                 } else {
                     continue;
                 }
-                QFont f = fdb.font(family, style, 12);
+                QFont f = QFontDatabase::font(family, style, 12);
                 QVERIFY(f.italic());
             }
         }
@@ -564,12 +561,11 @@ void tst_QFont::defaultFamily()
     QFETCH(QStringList, acceptableFamilies);
 
     QFont f;
-    QFontDatabase db;
     f.setStyleHint(styleHint);
     const QString familyForHint(f.defaultFamily());
 
     // it should at least return a family that is available.
-    QVERIFY(db.hasFamily(familyForHint));
+    QVERIFY(QFontDatabase::hasFamily(familyForHint));
 
     bool isAcceptable = false;
     Q_FOREACH (const QString& family, acceptableFamilies) {
@@ -590,14 +586,13 @@ void tst_QFont::toAndFromString()
     QFont defaultFont = QGuiApplication::font();
     QString family = defaultFont.family();
 
-    QFontDatabase fdb;
-    const QStringList stylesList = fdb.styles(family);
+    const QStringList stylesList = QFontDatabase::styles(family);
     if (stylesList.size() == 0)
         QSKIP("Default font doesn't have any styles");
 
     for (const QString &style : stylesList) {
         QFont result;
-        QFont initial = fdb.font(family, style, defaultFont.pointSize());
+        QFont initial = QFontDatabase::font(family, style, defaultFont.pointSize());
 
         result.fromString(initial.toString());
 
diff --git a/tests/auto/gui/text/qfontcache/tst_qfontcache.cpp b/tests/auto/gui/text/qfontcache/tst_qfontcache.cpp
index 3d3211c7a2..5c5bdf06ea 100644
--- a/tests/auto/gui/text/qfontcache/tst_qfontcache.cpp
+++ b/tests/auto/gui/text/qfontcache/tst_qfontcache.cpp
@@ -176,14 +176,12 @@ void tst_QFontCache::clear()
     }
 #endif
     {
-        QFontDatabase db;
-
         QFont f;
         f.setStyleHint(QFont::Serif);
         const QString familyForHint(f.defaultFamily());
 
         // it should at least return a family that is available
-        QVERIFY(db.hasFamily(familyForHint));
+        QVERIFY(QFontDatabase::hasFamily(familyForHint));
         f.exactMatch(); // loads engine
 
         fontEngine = QFontPrivate::get(f)->engineForScript(QChar::Script_Common);
diff --git a/tests/auto/gui/text/qfontdatabase/tst_qfontdatabase.cpp b/tests/auto/gui/text/qfontdatabase/tst_qfontdatabase.cpp
index c2b82059ec..38c423c4d6 100644
--- a/tests/auto/gui/text/qfontdatabase/tst_qfontdatabase.cpp
+++ b/tests/auto/gui/text/qfontdatabase/tst_qfontdatabase.cpp
@@ -113,8 +113,7 @@ void tst_QFontDatabase::styles()
 {
     QFETCH( QString, font );
 
-    QFontDatabase fdb;
-    QStringList styles = fdb.styles( font );
+    QStringList styles = QFontDatabase::styles( font );
     QStringList::Iterator it = styles.begin();
     while ( it != styles.end() ) {
         QString style = *it;
@@ -151,11 +150,10 @@ void tst_QFontDatabase::fixedPitch()
     QFETCH(QString, font);
     QFETCH(bool, fixedPitch);
 
-    QFontDatabase fdb;
-    if (!fdb.families().contains(font))
+    if (!QFontDatabase::families().contains(font))
         QSKIP("Font not installed");
 
-    QCOMPARE(fdb.isFixedPitch(font), fixedPitch);
+    QCOMPARE(QFontDatabase::isFixedPitch(font), fixedPitch);
 
     QFont qfont(font);
     QFontInfo fi(qfont);
@@ -184,8 +182,7 @@ void tst_QFontDatabase::trickyFonts()
 {
     QFETCH(QString, font);
 
-    QFontDatabase fdb;
-    if (!fdb.families().contains(font))
+    if (!QFontDatabase::families().contains(font))
         QSKIP( "Font not installed");
 
     QFont qfont(font);
@@ -232,9 +229,7 @@ void tst_QFontDatabase::addAppFont()
     QFETCH(bool, useMemoryFont);
     QSignalSpy fontDbChangedSpy(QGuiApplication::instance(), SIGNAL(fontDatabaseChanged()));
 
-    QFontDatabase db;
-
-    const QStringList oldFamilies = db.families();
+    const QStringList oldFamilies = QFontDatabase::families();
     QVERIFY(!oldFamilies.isEmpty());
 
     fontDbChangedSpy.clear();
@@ -262,7 +257,7 @@ void tst_QFontDatabase::addAppFont()
     const QStringList addedFamilies = QFontDatabase::applicationFontFamilies(id);
     QVERIFY(!addedFamilies.isEmpty());
 
-    const QStringList newFamilies = db.families();
+    const QStringList newFamilies = QFontDatabase::families();
     QVERIFY(!newFamilies.isEmpty());
     QVERIFY(newFamilies.count() >= oldFamilies.count());
 
@@ -277,7 +272,7 @@ void tst_QFontDatabase::addAppFont()
     QVERIFY(QFontDatabase::removeApplicationFont(id));
     QCOMPARE(fontDbChangedSpy.count(), 2);
 
-    QCOMPARE(db.families(), oldFamilies);
+    QCOMPARE(QFontDatabase::families(), oldFamilies);
 }
 
 void tst_QFontDatabase::addTwoAppFontsFromFamily()
@@ -306,15 +301,14 @@ void tst_QFontDatabase::addTwoAppFontsFromFamily()
 
 void tst_QFontDatabase::aliases()
 {
-    QFontDatabase db;
-    const QStringList families = db.families();
+    const QStringList families = QFontDatabase::families();
     QVERIFY(!families.isEmpty());
     const QString firstFont = families.front();
-    QVERIFY(db.hasFamily(firstFont));
+    QVERIFY(QFontDatabase::hasFamily(firstFont));
     const QString alias = QStringLiteral("AliasToFirstFont") + firstFont;
-    QVERIFY(!db.hasFamily(alias));
+    QVERIFY(!QFontDatabase::hasFamily(alias));
     QPlatformFontDatabase::registerAliasToFontFamily(firstFont, alias);
-    QVERIFY(db.hasFamily(alias));
+    QVERIFY(QFontDatabase::hasFamily(alias));
 }
 
 void tst_QFontDatabase::fallbackFonts()
@@ -368,12 +362,11 @@ void tst_QFontDatabase::condensedFontWidthNoFontMerging()
 
 void tst_QFontDatabase::condensedFontWidth()
 {
-    QFontDatabase db;
     QFontDatabase::addApplicationFont(m_testFont);
     QFontDatabase::addApplicationFont(m_testFontCondensed);
 
-    QVERIFY(db.hasFamily("QtBidiTestFont"));
-    if (!db.hasFamily("QtBidiTestFontCondensed"))
+    QVERIFY(QFontDatabase::hasFamily("QtBidiTestFont"));
+    if (!QFontDatabase::hasFamily("QtBidiTestFontCondensed"))
         QSKIP("This platform doesn't support font sub-family names (QTBUG-55625)");
 
     // Test we really get a condensed font, and a not renormalized one (QTBUG-48043):
@@ -387,10 +380,9 @@ void tst_QFontDatabase::condensedFontWidth()
 
 void tst_QFontDatabase::condensedFontMatching()
 {
-    QFontDatabase db;
     QFontDatabase::removeAllApplicationFonts();
     QFontDatabase::addApplicationFont(m_testFontCondensed);
-    if (!db.hasFamily("QtBidiTestFont"))
+    if (!QFontDatabase::hasFamily("QtBidiTestFont"))
         QSKIP("This platform doesn't support preferred font family names (QTBUG-53478)");
     QFontDatabase::addApplicationFont(m_testFont);
 
@@ -410,7 +402,7 @@ void tst_QFontDatabase::condensedFontMatching()
     QCOMPARE(QFontMetrics(tfcByStretch).horizontalAdvance(testString()),
              QFontMetrics(tfcByStyleName).horizontalAdvance(testString()));
 
-    if (!db.hasFamily("QtBidiTestFontCondensed"))
+    if (!QFontDatabase::hasFamily("QtBidiTestFontCondensed"))
         QSKIP("This platform doesn't support font sub-family names (QTBUG-55625)");
 
     QFont tfcBySubfamilyName("QtBidiTestFontCondensed");
@@ -445,25 +437,22 @@ void tst_QFontDatabase::smoothFonts()
 
 void tst_QFontDatabase::registerOpenTypePreferredNamesSystem()
 {
-    QFontDatabase db;
     // This font family was picked because it was the only one I had installed which showcased the
     // problem
-    if (!db.hasFamily(QString::fromLatin1("Source Code Pro ExtraLight")))
+    if (!QFontDatabase::hasFamily(QString::fromLatin1("Source Code Pro ExtraLight")))
         QSKIP("Source Code Pro ExtraLight is not installed");
 
-    QStringList styles = db.styles(QString::fromLatin1("Source Code Pro"));
+    QStringList styles = QFontDatabase::styles(QString::fromLatin1("Source Code Pro"));
     QVERIFY(styles.contains(QLatin1String("ExtraLight")));
 }
 
 void tst_QFontDatabase::registerOpenTypePreferredNamesApplication()
 {
-    QFontDatabase db;
-
     int id = QFontDatabase::addApplicationFont(QString::fromLatin1(":/testfont_open.otf"));
     if (id == -1)
         QSKIP("Skip the test since app fonts are not supported on this system");
 
-    QStringList styles = db.styles(QString::fromLatin1("QtBidiTestFont"));
+    QStringList styles = QFontDatabase::styles(QString::fromLatin1("QtBidiTestFont"));
     QVERIFY(styles.contains(QLatin1String("Open")));
 
     QFontDatabase::removeApplicationFont(id);
diff --git a/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp b/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp
index e1db231a20..93d9950492 100644
--- a/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp
+++ b/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp
@@ -91,11 +91,10 @@ void tst_QFontMetrics::same()
 void tst_QFontMetrics::metrics()
 {
     QFont font;
-    QFontDatabase fdb;
 
     // Query the QFontDatabase for a specific font, store the
     // result in family, style and size.
-    QStringList families = fdb.families();
+    QStringList families = QFontDatabase::families();
     if (families.isEmpty())
         return;
 
@@ -103,14 +102,14 @@ void tst_QFontMetrics::metrics()
     for (f_it = families.begin(); f_it != f_end; ++f_it) {
         const QString &family = *f_it;
 
-        QStringList styles = fdb.styles(family);
+        QStringList styles = QFontDatabase::styles(family);
         QStringList::ConstIterator s_it, s_end = styles.end();
         for (s_it = styles.begin(); s_it != s_end; ++s_it) {
             const QString &style = *s_it;
 
-            if (fdb.isSmoothlyScalable(family, style)) {
+            if (QFontDatabase::isSmoothlyScalable(family, style)) {
                 // smoothly scalable font... don't need to load every pointsize
-                font = fdb.font(family, style, 12);
+                font = QFontDatabase::font(family, style, 12);
 
                 QFontMetrics fontmetrics(font);
                 QCOMPARE(fontmetrics.ascent() + fontmetrics.descent(),
@@ -119,14 +118,14 @@ void tst_QFontMetrics::metrics()
                 QCOMPARE(fontmetrics.height() + fontmetrics.leading(),
                         fontmetrics.lineSpacing());
             } else {
-                QList<int> sizes = fdb.pointSizes(family, style);
+                QList<int> sizes = QFontDatabase::pointSizes(family, style);
                 QVERIFY(!sizes.isEmpty());
                 QList<int>::ConstIterator z_it, z_end = sizes.end();
                 for (z_it = sizes.begin(); z_it != z_end; ++z_it) {
                     const int size = *z_it;
 
                     // Initialize the font, and check if it is an exact match
-                    font = fdb.font(family, style, size);
+                    font = QFontDatabase::font(family, style, size);
 
                     QFontMetrics fontmetrics(font);
                     QCOMPARE(fontmetrics.ascent() + fontmetrics.descent(),
diff --git a/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp b/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
index 8ed9ad6a9a..9eb6eff1b3 100644
--- a/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
+++ b/tests/auto/gui/text/qrawfont/tst_qrawfont.cpp
@@ -121,8 +121,7 @@ void tst_QRawFont::initTestCase()
     if (testFont.isEmpty() || testFontBoldItalic.isEmpty())
         QFAIL("qrawfont unittest font files not found!");
 
-    QFontDatabase database;
-    if (database.families().count() == 0)
+    if (QFontDatabase::families().count() == 0)
         QSKIP("No fonts available!!!");
 }
 
@@ -389,8 +388,7 @@ void tst_QRawFont::advances()
 
 void tst_QRawFont::textLayout()
 {
-    QFontDatabase fontDatabase;
-    int id = fontDatabase.addApplicationFont(testFont);
+    int id = QFontDatabase::addApplicationFont(testFont);
     QVERIFY(id >= 0);
 
     QString familyName = QString::fromLatin1("QtBidiTestFont");
@@ -420,7 +418,7 @@ void tst_QRawFont::textLayout()
 
     QCOMPARE(glyphs.glyphIndexes(), expectedGlyphIndices);
 
-    QVERIFY(fontDatabase.removeApplicationFont(id));
+    QVERIFY(QFontDatabase::removeApplicationFont(id));
 }
 
 void tst_QRawFont::fontTable_data()
@@ -703,8 +701,7 @@ void tst_QRawFont::fromFont()
     QFETCH(QString, familyName);
     QFETCH(QFontDatabase::WritingSystem, writingSystem);
 
-    QFontDatabase fontDatabase;
-    int id = fontDatabase.addApplicationFont(fileName);
+    int id = QFontDatabase::addApplicationFont(fileName);
     QVERIFY(id >= 0);
 
     QFont font(familyName);
@@ -717,7 +714,7 @@ void tst_QRawFont::fromFont()
     QCOMPARE(rawFont.familyName(), familyName);
     QCOMPARE(rawFont.pixelSize(), 26.0);
 
-    QVERIFY(fontDatabase.removeApplicationFont(id));
+    QVERIFY(QFontDatabase::removeApplicationFont(id));
 }
 
 void tst_QRawFont::copyConstructor_data()
@@ -878,8 +875,7 @@ void tst_QRawFont::unsupportedWritingSystem()
 {
     QFETCH(QFont::HintingPreference, hintingPreference);
 
-    QFontDatabase fontDatabase;
-    int id = fontDatabase.addApplicationFont(testFont);
+    int id = QFontDatabase::addApplicationFont(testFont);
 
     QFont font("QtBidiTestFont");
     font.setHintingPreference(hintingPreference);
@@ -915,7 +911,7 @@ void tst_QRawFont::unsupportedWritingSystem()
     QCOMPARE(rawFont.familyName(), layoutFont.familyName());
     QCOMPARE(rawFont.pixelSize(), 12.0);
 
-    fontDatabase.removeApplicationFont(id);
+    QFontDatabase::removeApplicationFont(id);
 }
 
 void tst_QRawFont::rawFontSetPixelSize_data()
@@ -1017,8 +1013,7 @@ void tst_QRawFont::kernedAdvances()
 
 void tst_QRawFont::fallbackFontsOrder()
 {
-    QFontDatabase fontDatabase;
-    int id = fontDatabase.addApplicationFont(testFont);
+    int id = QFontDatabase::addApplicationFont(testFont);
 
     QFont font("QtBidiTestFont");
     font.setPixelSize(12.0);
@@ -1047,7 +1042,7 @@ void tst_QRawFont::fallbackFontsOrder()
     // is not sorted by writing system support.
     QCOMPARE(glyphRuns.size(), 1);
 
-    fontDatabase.removeApplicationFont(id);
+    QFontDatabase::removeApplicationFont(id);
 }
 
 void tst_QRawFont::qtbug65923_partal_clone_data()
diff --git a/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp b/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp
index 04e6282ca9..c85bb737bf 100644
--- a/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp
+++ b/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp
@@ -1078,8 +1078,7 @@ void tst_QTextScriptEngine::mirroredChars()
 
 void tst_QTextScriptEngine::controlInSyllable_qtbug14204()
 {
-    QFontDatabase db;
-    if (!db.families().contains(QStringLiteral("Aparajita")))
+    if (!QFontDatabase::families().contains(QStringLiteral("Aparajita")))
         QSKIP("couldn't find 'Aparajita' font");
 
     QFont font(QStringLiteral("Aparajita"));
@@ -1181,8 +1180,7 @@ void tst_QTextScriptEngine::combiningMarks_qtbug15675()
 
 void tst_QTextScriptEngine::thaiIsolatedSaraAm()
 {
-    QFontDatabase db;
-    if (!db.families().contains("Waree"))
+    if (!QFontDatabase::families().contains("Waree"))
         QSKIP("couldn't find 'Waree' font");
 
     QFont font(QStringLiteral("Waree"));
@@ -1214,8 +1212,7 @@ void tst_QTextScriptEngine::thaiWithZWJ()
     QSKIP("Requires up-to-date Harfbuzz");
 #endif
 
-    QFontDatabase db;
-    if (!db.families().contains("Waree"))
+    if (!QFontDatabase::families().contains("Waree"))
         QSKIP("couldn't find 'Waree' font");
 
     QFont font(QStringLiteral("Waree"));
diff --git a/tests/auto/widgets/dialogs/qfontdialog/tst_qfontdialog.cpp b/tests/auto/widgets/dialogs/qfontdialog/tst_qfontdialog.cpp
index 628af91674..ad6bf900fd 100644
--- a/tests/auto/widgets/dialogs/qfontdialog/tst_qfontdialog.cpp
+++ b/tests/auto/widgets/dialogs/qfontdialog/tst_qfontdialog.cpp
@@ -182,7 +182,6 @@ void tst_QFontDialog::task256466_wrongStyle()
     if (QGuiApplication::platformName().startsWith(QLatin1String("wayland"), Qt::CaseInsensitive))
         QSKIP("Wayland: This freezes. Figure out why.");
 
-    QFontDatabase fdb;
     FriendlyFontDialog dialog;
     dialog.setOption(QFontDialog::DontUseNativeDialog);
     QListView *familyList = reinterpret_cast<QListView*>(dialog.d_func()->familyList);
@@ -193,7 +192,7 @@ void tst_QFontDialog::task256466_wrongStyle()
         familyList->setCurrentIndex(currentFamily);
         int expectedSize = sizeList->currentIndex().data().toInt();
         const QFont current = dialog.currentFont(),
-                    expected = fdb.font(currentFamily.data().toString(),
+                    expected = QFontDatabase::font(currentFamily.data().toString(),
             styleList->currentIndex().data().toString(), expectedSize);
         QCOMPARE(current.family(), expected.family());
         QCOMPARE(current.style(), expected.style());
diff --git a/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp b/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
index 7d22a84ece..6763d3b6a6 100644
--- a/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
+++ b/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
@@ -367,13 +367,12 @@ void tst_QApplication::setFont_data()
     int argc = 0;
     QApplication app(argc, nullptr); // Needed for QFontDatabase
 
-    QFontDatabase fdb;
-    const QStringList &families = fdb.families();
+    const QStringList &families = QFontDatabase::families();
     for (int i = 0, count = qMin(3, families.size()); i < count; ++i) {
         const auto &family = families.at(i);
-        const QStringList &styles = fdb.styles(family);
+        const QStringList &styles = QFontDatabase::styles(family);
         if (!styles.isEmpty()) {
-            QList<int> sizes = fdb.pointSizes(family, styles.constFirst());
+            QList<int> sizes = QFontDatabase::pointSizes(family, styles.constFirst());
             if (sizes.isEmpty())
                 sizes = QFontDatabase::standardSizes();
             if (!sizes.isEmpty()) {
@@ -2515,7 +2514,6 @@ Q_GLOBAL_STATIC(QWidget, tst_qapp_widget);
 Q_GLOBAL_STATIC(QPixmap, tst_qapp_pixmap);
 Q_GLOBAL_STATIC(QFont, tst_qapp_font);
 Q_GLOBAL_STATIC(QRegion, tst_qapp_region);
-Q_GLOBAL_STATIC(QFontDatabase, tst_qapp_fontDatabase);
 #ifndef QT_NO_CURSOR
 Q_GLOBAL_STATIC(QCursor, tst_qapp_cursor);
 #endif
@@ -2540,7 +2538,6 @@ void tst_QApplication::globalStaticObjectDestruction()
     QVERIFY(tst_qapp_pixmap());
     QVERIFY(tst_qapp_font());
     QVERIFY(tst_qapp_region());
-    QVERIFY(tst_qapp_fontDatabase());
 #ifndef QT_NO_CURSOR
     QVERIFY(tst_qapp_cursor());
 #endif
diff --git a/tests/auto/widgets/widgets/qfontcombobox/tst_qfontcombobox.cpp b/tests/auto/widgets/widgets/qfontcombobox/tst_qfontcombobox.cpp
index bd3ea5686a..1f06c537c6 100644
--- a/tests/auto/widgets/widgets/qfontcombobox/tst_qfontcombobox.cpp
+++ b/tests/auto/widgets/widgets/qfontcombobox/tst_qfontcombobox.cpp
@@ -88,20 +88,19 @@ void tst_QFontComboBox::qfontcombobox()
 void tst_QFontComboBox::currentFont_data()
 {
     QTest::addColumn<QFont>("currentFont");
-    QFontDatabase db;
     // Normalize the names
     QFont defaultFont;
     QFontInfo fi(defaultFont);
     defaultFont = QFont(fi.family()); // make sure we have a real font name and not something like 'Sans Serif'.
-    if (!db.isPrivateFamily(defaultFont.family()))
+    if (!QFontDatabase::isPrivateFamily(defaultFont.family()))
         QTest::newRow("default") << defaultFont;
     defaultFont.setPointSize(defaultFont.pointSize() + 10);
-    if (!db.isPrivateFamily(defaultFont.family()))
+    if (!QFontDatabase::isPrivateFamily(defaultFont.family()))
         QTest::newRow("default2") << defaultFont;
-    QStringList list = db.families();
+    QStringList list = QFontDatabase::families();
     for (int i = 0; i < list.count(); ++i) {
         QFont f = QFont(QFontInfo(QFont(list.at(i))).family());
-        if (!db.isPrivateFamily(f.family()))
+        if (!QFontDatabase::isPrivateFamily(f.family()))
             QTest::newRow(qPrintable(list.at(i))) << f;
     }
 }
@@ -168,8 +167,7 @@ void tst_QFontComboBox::fontFilters()
     box.setFontFilters(fontFilters);
     QCOMPARE(box.fontFilters(), fontFilters);
 
-    QFontDatabase db;
-    QStringList list = db.families();
+    QStringList list = QFontDatabase::families();
     int c = 0;
     const int scalableMask = (QFontComboBox::ScalableFonts | QFontComboBox::NonScalableFonts);
     const int spacingMask = (QFontComboBox::ProportionalFonts | QFontComboBox::MonospacedFonts);
@@ -179,20 +177,20 @@ void tst_QFontComboBox::fontFilters()
         fontFilters &= ~spacingMask;
 
     for (int i = 0; i < list.count(); ++i) {
-        if (db.isPrivateFamily(list[i]))
+        if (QFontDatabase::isPrivateFamily(list[i]))
             continue;
         if (fontFilters & QFontComboBox::ScalableFonts) {
-            if (!db.isSmoothlyScalable(list[i]))
+            if (!QFontDatabase::isSmoothlyScalable(list[i]))
                 continue;
         } else if (fontFilters & QFontComboBox::NonScalableFonts) {
-            if (db.isSmoothlyScalable(list[i]))
+            if (QFontDatabase::isSmoothlyScalable(list[i]))
                 continue;
         }
         if (fontFilters & QFontComboBox::MonospacedFonts) {
-            if (!db.isFixedPitch(list[i]))
+            if (!QFontDatabase::isFixedPitch(list[i]))
                 continue;
         } else if (fontFilters & QFontComboBox::ProportionalFonts) {
-            if (db.isFixedPitch(list[i]))
+            if (QFontDatabase::isFixedPitch(list[i]))
                 continue;
         }
         c++;
@@ -243,11 +241,10 @@ void tst_QFontComboBox::writingSystem()
     box.setWritingSystem(writingSystem);
     QCOMPARE(box.writingSystem(), writingSystem);
 
-    QFontDatabase db;
-    QStringList list = db.families(writingSystem);
+    QStringList list = QFontDatabase::families(writingSystem);
     int c = list.count();
     for (int i = 0; i < list.count(); ++i) {
-        if (db.isPrivateFamily(list[i]))
+        if (QFontDatabase::isPrivateFamily(list[i]))
             c--;
     }
     QCOMPARE(box.model()->rowCount(), c);