Merge commit 'dev' into 'wip/cmake-merge'

Change-Id: I176c40d031be26a1dd1cf08843e448a660598783

70 files changed, 1980 insertions, 995 deletions

diff --git a/src/platformsupport/clipboard/qmacmime.mm b/src/platformsupport/clipboard/qmacmime.mm
index caa2ccc6e5..f425e34b39 100644
--- a/src/platformsupport/clipboard/qmacmime.mm
+++ b/src/platformsupport/clipboard/qmacmime.mm
@@ -418,8 +418,10 @@ QVariant QMacPasteboardMimeUnicodeText::convertToMime(const QString &mimetype, Q
     QVariant ret;
     if (flavor == QLatin1String("public.utf8-plain-text")) {
         ret = QString::fromUtf8(firstData);
+#if QT_CONFIG(textcodec)
     } else if (flavor == QLatin1String("public.utf16-plain-text")) {
         ret = QTextCodec::codecForName("UTF-16")->toUnicode(firstData);
+#endif
     } else {
         qWarning("QMime::convertToMime: unhandled mimetype: %s", qPrintable(mimetype));
     }
@@ -432,8 +434,10 @@ QList<QByteArray> QMacPasteboardMimeUnicodeText::convertFromMime(const QString &
     QString string = data.toString();
     if (flavor == QLatin1String("public.utf8-plain-text"))
         ret.append(string.toUtf8());
+#if QT_CONFIG(textcodec)
     else if (flavor == QLatin1String("public.utf16-plain-text"))
         ret.append(QTextCodec::codecForName("UTF-16")->fromUnicode(string));
+#endif
     return ret;
 }
 
diff --git a/src/platformsupport/devicediscovery/qdevicediscovery_p.h b/src/platformsupport/devicediscovery/qdevicediscovery_p.h
index e3c22b0b37..f1f50e9708 100644
--- a/src/platformsupport/devicediscovery/qdevicediscovery_p.h
+++ b/src/platformsupport/devicediscovery/qdevicediscovery_p.h
@@ -86,7 +86,7 @@ public:
     Q_ENUM(QDeviceType)
     Q_DECLARE_FLAGS(QDeviceTypes, QDeviceType)
 
-    static QDeviceDiscovery *create(QDeviceTypes type, QObject *parent = 0);
+    static QDeviceDiscovery *create(QDeviceTypes type, QObject *parent = nullptr);
 
     virtual QStringList scanConnectedDevices() = 0;
 
@@ -96,7 +96,7 @@ signals:
 
 protected:
     QDeviceDiscovery(QDeviceTypes types, QObject *parent) : QObject(parent), m_types(types) { }
-    Q_DISABLE_COPY(QDeviceDiscovery)
+    Q_DISABLE_COPY_MOVE(QDeviceDiscovery)
 
     QDeviceTypes m_types;
 };
diff --git a/src/platformsupport/devicediscovery/qdevicediscovery_udev_p.h b/src/platformsupport/devicediscovery/qdevicediscovery_udev_p.h
index 28618d0b21..82b475776d 100644
--- a/src/platformsupport/devicediscovery/qdevicediscovery_udev_p.h
+++ b/src/platformsupport/devicediscovery/qdevicediscovery_udev_p.h
@@ -61,7 +61,7 @@ class QDeviceDiscoveryUDev : public QDeviceDiscovery
     Q_OBJECT
 
 public:
-    QDeviceDiscoveryUDev(QDeviceTypes types, struct udev *udev, QObject *parent = 0);
+    QDeviceDiscoveryUDev(QDeviceTypes types, struct udev *udev, QObject *parent = nullptr);
     ~QDeviceDiscoveryUDev();
     QStringList scanConnectedDevices() override;
 
diff --git a/src/platformsupport/edid/qedidparser.cpp b/src/platformsupport/edid/qedidparser.cpp
index ccaa50704c..06c8852825 100644
--- a/src/platformsupport/edid/qedidparser.cpp
+++ b/src/platformsupport/edid/qedidparser.cpp
@@ -166,7 +166,7 @@ QString QEdidParser::parseEdidString(const quint8 *data)
 
     // Replace non-printable characters with dash
     for (int i = 0; i < buffer.count(); ++i) {
-        if (buffer[i] < '\040' && buffer[i] > '\176')
+        if (buffer[i] < '\040' || buffer[i] > '\176')
             buffer[i] = '-';
     }
 
diff --git a/src/platformsupport/eglconvenience/eglconvenience.pro b/src/platformsupport/eglconvenience/eglconvenience.pro
index 4301d63574..df21f14697 100644
--- a/src/platformsupport/eglconvenience/eglconvenience.pro
+++ b/src/platformsupport/eglconvenience/eglconvenience.pro
@@ -26,15 +26,15 @@ qtConfig(opengl) {
         qeglpbuffer.cpp
 }
 
-# Avoid X11 header collision, use generic EGL native types
-DEFINES += QT_EGL_NO_X11
-
-qtConfig(xlib) {
+qtConfig(egl_x11) {
     HEADERS += \
         qxlibeglintegration_p.h
     SOURCES += \
         qxlibeglintegration.cpp
-    LIBS_PRIVATE += $$QMAKE_LIBS_X11
+    QMAKE_USE_PRIVATE += xlib
+} else {
+    # Avoid X11 header collision, use generic EGL native types
+    DEFINES += QT_EGL_NO_X11
 }
 CONFIG += egl
 
diff --git a/src/platformsupport/eglconvenience/qeglpbuffer_p.h b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
index 0285e067a6..8ad2eb7248 100644
--- a/src/platformsupport/eglconvenience/qeglpbuffer_p.h
+++ b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
@@ -60,7 +60,7 @@ class QEGLPbuffer : public QPlatformOffscreenSurface
 {
 public:
     QEGLPbuffer(EGLDisplay display, const QSurfaceFormat &format, QOffscreenSurface *offscreenSurface,
-                QEGLPlatformContext::Flags flags = 0);
+                QEGLPlatformContext::Flags flags = nullptr);
     ~QEGLPbuffer();
 
     QSurfaceFormat format() const override { return m_format; }
diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
index 9d8bf07af8..c0e528f922 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
@@ -332,14 +332,6 @@ void QEGLPlatformContext::updateFormatFromGL()
                 QByteArray version = QByteArray(reinterpret_cast<const char *>(s));
                 int major, minor;
                 if (QPlatformOpenGLContext::parseOpenGLVersion(version, major, minor)) {
-#if defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_EMBEDDED)
-                    // Some Android 4.2.2 devices report OpenGL ES 3.0 without the functions being available.
-                    static int apiLevel = QtAndroidPrivate::androidSdkVersion();
-                    if (apiLevel <= 17 && major >= 3) {
-                        major = 2;
-                        minor = 0;
-                    }
-#endif
                     m_format.setMajorVersion(major);
                     m_format.setMinorVersion(minor);
                 }
diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
index d6cbbe4131..ed77c57df5 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
@@ -68,8 +68,8 @@ public:
     Q_DECLARE_FLAGS(Flags, Flag)
 
     QEGLPlatformContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, EGLDisplay display,
-                        EGLConfig *config = 0, const QVariant &nativeHandle = QVariant(),
-                        Flags flags = 0);
+                        EGLConfig *config = nullptr, const QVariant &nativeHandle = QVariant(),
+                        Flags flags = nullptr);
     ~QEGLPlatformContext();
 
     void initialize() override;
diff --git a/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h b/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
index c3d3070210..31a79dbc6c 100644
--- a/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
+++ b/src/platformsupport/eglconvenience/qeglstreamconvenience_p.h
@@ -131,6 +131,12 @@ typedef EGLBoolean (EGLAPIENTRYP PFNEGLSTREAMCONSUMERRELEASEKHRPROC) (EGLDisplay
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLSTREAMCONSUMEROUTPUTEXTPROC) (EGLDisplay dpy, EGLStreamKHR stream, EGLOutputLayerEXT layer);
 #endif
 
+#ifndef EGL_EXT_stream_acquire_mode
+#define EGL_EXT_stream_acquire_mode 1
+#define EGL_CONSUMER_AUTO_ACQUIRE_EXT         0x332B
+#define EGL_RESOURCE_BUSY_EXT                 0x3353
+#endif
+
 #ifndef EGL_EXT_platform_device
 #define EGL_PLATFORM_DEVICE_EXT           0x313F
 #endif
@@ -156,6 +162,11 @@ typedef EGLBoolean (EGLAPIENTRYP PFNEGLSTREAMCONSUMERACQUIREATTRIBNVPROC) (EGLDi
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLSTREAMCONSUMERRELEASEATTRIBNVPROC) (EGLDisplay dpy, EGLStreamKHR stream, const EGLAttrib *attrib_list);
 #endif
 
+#ifndef EGL_NV_output_drm_flip_event
+#define EGL_NV_output_drm_flip_event 1
+#define EGL_DRM_FLIP_EVENT_DATA_NV            0x333E
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QEGLStreamConvenience
diff --git a/src/platformsupport/eglconvenience/qt_egl_p.h b/src/platformsupport/eglconvenience/qt_egl_p.h
index e2c6b0ceb6..ea554927de 100644
--- a/src/platformsupport/eglconvenience/qt_egl_p.h
+++ b/src/platformsupport/eglconvenience/qt_egl_p.h
@@ -52,7 +52,9 @@
 //
 
 #ifdef QT_EGL_NO_X11
-# define MESA_EGL_NO_X11_HEADERS // MESA
+# ifndef MESA_EGL_NO_X11_HEADERS
+#  define MESA_EGL_NO_X11_HEADERS // MESA
+# endif
 # if !defined(Q_OS_INTEGRITY)
 #  define WIN_INTERFACE_CUSTOM   // NV
 # endif // Q_OS_INTEGRITY
diff --git a/src/platformsupport/eglconvenience/qxlibeglintegration.cpp b/src/platformsupport/eglconvenience/qxlibeglintegration.cpp
index 565dbfb11b..ac743e1e38 100644
--- a/src/platformsupport/eglconvenience/qxlibeglintegration.cpp
+++ b/src/platformsupport/eglconvenience/qxlibeglintegration.cpp
@@ -91,21 +91,21 @@ VisualID QXlibEglIntegration::getCompatibleVisualId(Display *display, EGLDisplay
             int visualRedSize = qPopulationCount(chosenVisualInfo->red_mask);
             int visualGreenSize = qPopulationCount(chosenVisualInfo->green_mask);
             int visualBlueSize = qPopulationCount(chosenVisualInfo->blue_mask);
-            int visualAlphaSize = chosenVisualInfo->depth == 32 ? 8 : 0;
+            int visualAlphaSize = chosenVisualInfo->depth - visualRedSize - visualBlueSize - visualGreenSize;
 
-            const bool visualMatchesConfig = visualRedSize == configRedSize
-                && visualGreenSize == configGreenSize
-                && visualBlueSize == configBlueSize
-                && visualAlphaSize == configAlphaSize;
+            const bool visualMatchesConfig = visualRedSize >= configRedSize
+                && visualGreenSize >= configGreenSize
+                && visualBlueSize >= configBlueSize
+                && visualAlphaSize >= configAlphaSize;
 
             // In some cases EGL tends to suggest a 24-bit visual for 8888
             // configs. In such a case we have to fall back to XGetVisualInfo.
             if (!visualMatchesConfig) {
                 visualId = 0;
                 qCDebug(lcXlibEglDebug,
-                        "EGL suggested using X Visual ID %d (%d %d %d depth %d) for EGL config %d"
+                        "EGL suggested using X Visual ID %d (%d %d %d %d depth %d) for EGL config %d"
                         "(%d %d %d %d), but this is incompatible",
-                        (int)visualId, visualRedSize, visualGreenSize, visualBlueSize, chosenVisualInfo->depth,
+                        (int)visualId, visualRedSize, visualGreenSize, visualBlueSize, visualAlphaSize, chosenVisualInfo->depth,
                         configId, configRedSize, configGreenSize, configBlueSize, configAlphaSize);
             }
         } else {
diff --git a/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp b/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp
index dc4785071f..0ccbf01e80 100644
--- a/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp
+++ b/src/platformsupport/eventdispatchers/qeventdispatcher_glib.cpp
@@ -52,17 +52,14 @@ struct GUserEventSource
 {
     GSource source;
     QPAEventDispatcherGlib *q;
+    QPAEventDispatcherGlibPrivate *d;
 };
 
 static gboolean userEventSourcePrepare(GSource *source, gint *timeout)
 {
     Q_UNUSED(timeout)
     GUserEventSource *userEventSource = reinterpret_cast<GUserEventSource *>(source);
-    QPAEventDispatcherGlib *dispatcher = userEventSource->q;
-    if (dispatcher->m_flags & QEventLoop::ExcludeUserInputEvents)
-        return QWindowSystemInterface::nonUserInputEventsQueued();
-    else
-        return QWindowSystemInterface::windowSystemEventsQueued() > 0;
+    return userEventSource->d->wakeUpCalled;
 }
 
 static gboolean userEventSourceCheck(GSource *source)
@@ -94,6 +91,7 @@ QPAEventDispatcherGlibPrivate::QPAEventDispatcherGlibPrivate(GMainContext *conte
     userEventSource = reinterpret_cast<GUserEventSource *>(g_source_new(&userEventSourceFuncs,
                                                                        sizeof(GUserEventSource)));
     userEventSource->q = q;
+    userEventSource->d = this;
     g_source_set_can_recurse(&userEventSource->source, true);
     g_source_attach(&userEventSource->source, mainContext);
 }
diff --git a/src/platformsupport/eventdispatchers/qeventdispatcher_glib_p.h b/src/platformsupport/eventdispatchers/qeventdispatcher_glib_p.h
index 085a1c52f3..b9254d3071 100644
--- a/src/platformsupport/eventdispatchers/qeventdispatcher_glib_p.h
+++ b/src/platformsupport/eventdispatchers/qeventdispatcher_glib_p.h
@@ -64,7 +64,7 @@ class QPAEventDispatcherGlib : public QEventDispatcherGlib
     Q_DECLARE_PRIVATE(QPAEventDispatcherGlib)
 
 public:
-    explicit QPAEventDispatcherGlib(QObject *parent = 0);
+    explicit QPAEventDispatcherGlib(QObject *parent = nullptr);
     ~QPAEventDispatcherGlib();
 
     bool processEvents(QEventLoop::ProcessEventsFlags flags) override;
@@ -77,7 +77,7 @@ class QPAEventDispatcherGlibPrivate : public QEventDispatcherGlibPrivate
 {
     Q_DECLARE_PUBLIC(QPAEventDispatcherGlib)
 public:
-    QPAEventDispatcherGlibPrivate(GMainContext *context = 0);
+    QPAEventDispatcherGlibPrivate(GMainContext *context = nullptr);
     GUserEventSource *userEventSource;
 };
 
diff --git a/src/platformsupport/eventdispatchers/qunixeventdispatcher_qpa_p.h b/src/platformsupport/eventdispatchers/qunixeventdispatcher_qpa_p.h
index 7f775b73ee..8157b8793d 100644
--- a/src/platformsupport/eventdispatchers/qunixeventdispatcher_qpa_p.h
+++ b/src/platformsupport/eventdispatchers/qunixeventdispatcher_qpa_p.h
@@ -61,7 +61,7 @@ class QUnixEventDispatcherQPA : public QEventDispatcherUNIX
     Q_OBJECT
 
 public:
-    explicit QUnixEventDispatcherQPA(QObject *parent = 0);
+    explicit QUnixEventDispatcherQPA(QObject *parent = nullptr);
     ~QUnixEventDispatcherQPA();
 
     bool processEvents(QEventLoop::ProcessEventsFlags flags);
diff --git a/src/platformsupport/fbconvenience/qfbcursor.cpp b/src/platformsupport/fbconvenience/qfbcursor.cpp
index 7daf3f4d0c..e0f6b69e77 100644
--- a/src/platformsupport/fbconvenience/qfbcursor.cpp
+++ b/src/platformsupport/fbconvenience/qfbcursor.cpp
@@ -63,9 +63,9 @@ QFbCursor::QFbCursor(QFbScreen *screen)
       mCursorImage(nullptr),
       mDeviceListener(nullptr)
 {
-    QByteArray hideCursorVal = qgetenv("QT_QPA_FB_HIDECURSOR");
-    if (!hideCursorVal.isEmpty())
-        mVisible = hideCursorVal.toInt() == 0;
+    const char *envVar = "QT_QPA_FB_HIDECURSOR";
+    if (qEnvironmentVariableIsSet(envVar))
+        mVisible = qEnvironmentVariableIntValue(envVar) == 0;
     if (!mVisible)
         return;
 
@@ -83,7 +83,7 @@ QFbCursor::~QFbCursor()
     delete mDeviceListener;
 }
 
-QRect QFbCursor::getCurrentRect()
+QRect QFbCursor::getCurrentRect() const
 {
     QRect rect = mCursorImage->image()->rect().translated(-mCursorImage->hotspot().x(),
                                                           -mCursorImage->hotspot().y());
@@ -102,6 +102,8 @@ void QFbCursor::setPos(const QPoint &pos)
 {
     QGuiApplicationPrivate::inputDeviceManager()->setCursorPos(pos);
     m_pos = pos;
+    if (!mVisible)
+        return;
     mCurrentRect = getCurrentRect();
     if (mOnScreen || mScreen->geometry().intersects(mCurrentRect.translated(mScreen->geometry().topLeft())))
         setDirty();
@@ -112,6 +114,8 @@ void QFbCursor::pointerEvent(const QMouseEvent &e)
     if (e.type() != QEvent::MouseMove)
         return;
     m_pos = e.screenPos().toPoint();
+    if (!mVisible)
+        return;
     mCurrentRect = getCurrentRect();
     if (mOnScreen || mScreen->geometry().intersects(mCurrentRect.translated(mScreen->geometry().topLeft())))
         setDirty();
@@ -149,23 +153,28 @@ QRect QFbCursor::dirtyRect()
 
 void QFbCursor::setCursor(Qt::CursorShape shape)
 {
-    mCursorImage->set(shape);
+    if (mCursorImage)
+        mCursorImage->set(shape);
 }
 
 void QFbCursor::setCursor(const QImage &image, int hotx, int hoty)
 {
-    mCursorImage->set(image, hotx, hoty);
+    if (mCursorImage)
+        mCursorImage->set(image, hotx, hoty);
 }
 
 void QFbCursor::setCursor(const uchar *data, const uchar *mask, int width, int height, int hotX, int hotY)
 {
-    mCursorImage->set(data, mask, width, height, hotX, hotY);
+    if (mCursorImage)
+        mCursorImage->set(data, mask, width, height, hotX, hotY);
 }
 
 #ifndef QT_NO_CURSOR
 void QFbCursor::changeCursor(QCursor * widgetCursor, QWindow *window)
 {
     Q_UNUSED(window);
+    if (!mVisible)
+        return;
     const Qt::CursorShape shape = widgetCursor ? widgetCursor->shape() : Qt::ArrowCursor;
 
     if (shape == Qt::BitmapCursor) {
@@ -196,7 +205,7 @@ void QFbCursor::setDirty()
 
 void QFbCursor::updateMouseStatus()
 {
-    mVisible = mDeviceListener->hasMouse();
+    mVisible = mDeviceListener ? mDeviceListener->hasMouse() : false;
     mScreen->setDirty(mVisible ? getCurrentRect() : lastPainted());
 }
 
diff --git a/src/platformsupport/fbconvenience/qfbcursor_p.h b/src/platformsupport/fbconvenience/qfbcursor_p.h
index beda10a5f3..cc36a2411b 100644
--- a/src/platformsupport/fbconvenience/qfbcursor_p.h
+++ b/src/platformsupport/fbconvenience/qfbcursor_p.h
@@ -105,7 +105,7 @@ private:
     void setCursor(const uchar *data, const uchar *mask, int width, int height, int hotX, int hotY);
     void setCursor(Qt::CursorShape shape);
     void setCursor(const QImage &image, int hotx, int hoty);
-    QRect getCurrentRect();
+    QRect getCurrentRect() const;
 
     bool mVisible;
     QFbScreen *mScreen;
diff --git a/src/platformsupport/fbconvenience/qfbvthandler_p.h b/src/platformsupport/fbconvenience/qfbvthandler_p.h
index 17d07317b2..d565ec3632 100644
--- a/src/platformsupport/fbconvenience/qfbvthandler_p.h
+++ b/src/platformsupport/fbconvenience/qfbvthandler_p.h
@@ -63,7 +63,7 @@ class QFbVtHandler : public QObject
     Q_OBJECT
 
 public:
-    QFbVtHandler(QObject *parent = 0);
+    QFbVtHandler(QObject *parent = nullptr);
     ~QFbVtHandler();
 
 signals:
diff --git a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
index aa8f9a892a..e545d54ec2 100644
--- a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
+++ b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
@@ -908,7 +908,7 @@ QFont QFontconfigDatabase::defaultFont() const
 void QFontconfigDatabase::setupFontEngine(QFontEngineFT *engine, const QFontDef &fontDef) const
 {
     bool antialias = !(fontDef.styleStrategy & QFont::NoAntialias);
-    bool forcedAntialiasSetting = !antialias;
+    bool forcedAntialiasSetting = !antialias || QHighDpiScaling::isActive();
 
     const QPlatformServices *services = QGuiApplicationPrivate::platformIntegration()->services();
     bool useXftConf = false;
diff --git a/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp b/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
index 7b4f6aa107..40db7dbac7 100644
--- a/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
+++ b/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
@@ -121,13 +121,12 @@ class QtFreetypeData
 {
 public:
     QtFreetypeData()
-        : library(0), hasPatentFreeLcdRendering(false)
+        : library(0)
     { }
     ~QtFreetypeData();
 
     FT_Library library;
     QHash<QFontEngine::FaceId, QFreetypeFace *> faces;
-    bool hasPatentFreeLcdRendering;
 };
 
 QtFreetypeData::~QtFreetypeData()
@@ -153,11 +152,6 @@ QtFreetypeData *qt_getFreetypeData()
         FT_Bool no_darkening = false;
         FT_Property_Set(freetypeData->library, "cff", "no-stem-darkening", &no_darkening);
 #endif
-        // FreeType has since 2.8.1 a patent free alternative to LCD-filtering.
-        FT_Int amajor, aminor = 0, apatch = 0;
-        FT_Library_Version(freetypeData->library, &amajor, &aminor, &apatch);
-        if (QT_VERSION_CHECK(amajor, aminor, apatch) >= QT_VERSION_CHECK(2, 8, 1))
-            freetypeData->hasPatentFreeLcdRendering = true;
     }
     return freetypeData;
 }
@@ -561,26 +555,7 @@ QFontEngineFT::Glyph::~Glyph()
     delete [] data;
 }
 
-struct LcdFilterDummy
-{
-    static inline void filterPixel(uchar &, uchar &, uchar &)
-    {}
-};
-
-struct LcdFilterLegacy
-{
-    static inline void filterPixel(uchar &red, uchar &green, uchar &blue)
-    {
-        uint r = red, g = green, b = blue;
-        // intra-pixel filter used by the legacy filter (adopted from _ft_lcd_filter_legacy)
-        red   = (r * uint(65538 * 9/13) + g * uint(65538 * 1/6) + b * uint(65538 * 1/13)) / 65536;
-        green = (r * uint(65538 * 3/13) + g * uint(65538 * 4/6) + b * uint(65538 * 3/13)) / 65536;
-        blue  = (r * uint(65538 * 1/13) + g * uint(65538 * 1/6) + b * uint(65538 * 9/13)) / 65536;
-    }
-};
-
-template <typename LcdFilter>
-static void convertRGBToARGB_helper(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
+static inline void convertRGBToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
 {
     const int offs = bgr ? -1 : 1;
     const int w = width * 3;
@@ -590,24 +565,14 @@ static void convertRGBToARGB_helper(const uchar *src, uint *dst, int width, int
             uchar red = src[x + 1 - offs];
             uchar green = src[x + 1];
             uchar blue = src[x + 1 + offs];
-            LcdFilter::filterPixel(red, green, blue);
-            *dd++ = (0xFF << 24) | (red << 16) | (green << 8) | blue;
+            *dd++ = (0xFFU << 24) | (red << 16) | (green << 8) | blue;
         }
         dst += width;
         src += src_pitch;
     }
 }
 
-static inline void convertRGBToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
-{
-    if (!legacyFilter)
-        convertRGBToARGB_helper<LcdFilterDummy>(src, dst, width, height, src_pitch, bgr);
-    else
-        convertRGBToARGB_helper<LcdFilterLegacy>(src, dst, width, height, src_pitch, bgr);
-}
-
-template <typename LcdFilter>
-static void convertRGBToARGB_V_helper(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
+static inline void convertRGBToARGB_V(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr)
 {
     const int offs = bgr ? -src_pitch : src_pitch;
     while (height--) {
@@ -615,54 +580,12 @@ static void convertRGBToARGB_V_helper(const uchar *src, uint *dst, int width, in
             uchar red = src[x + src_pitch - offs];
             uchar green = src[x + src_pitch];
             uchar blue = src[x + src_pitch + offs];
-            LcdFilter::filterPixel(red, green, blue);
-            *dst++ = (0XFF << 24) | (red << 16) | (green << 8) | blue;
+            *dst++ = (0XFFU << 24) | (red << 16) | (green << 8) | blue;
         }
         src += 3*src_pitch;
     }
 }
 
-static inline void convertRGBToARGB_V(const uchar *src, uint *dst, int width, int height, int src_pitch, bool bgr, bool legacyFilter)
-{
-    if (!legacyFilter)
-        convertRGBToARGB_V_helper<LcdFilterDummy>(src, dst, width, height, src_pitch, bgr);
-    else
-        convertRGBToARGB_V_helper<LcdFilterLegacy>(src, dst, width, height, src_pitch, bgr);
-}
-
-static inline void convertGRAYToARGB(const uchar *src, uint *dst, int width, int height, int src_pitch)
-{
-    while (height--) {
-        const uchar *p = src;
-        const uchar * const e = p + width;
-        while (p < e) {
-            uchar gray = *p++;
-            *dst++ = (0xFF << 24) | (gray << 16) | (gray << 8) | gray;
-        }
-        src += src_pitch;
-    }
-}
-
-static void convoluteBitmap(const uchar *src, uchar *dst, int width, int height, int pitch)
-{
-    // convolute the bitmap with a triangle filter to get rid of color fringes
-    // If we take account for a gamma value of 2, we end up with
-    // weights of 1, 4, 9, 4, 1. We use an approximation of 1, 3, 8, 3, 1 here,
-    // as this nicely sums up to 16 :)
-    int h = height;
-    while (h--) {
-        dst[0] = dst[1] = 0;
-        //
-        for (int x = 2; x < width - 2; ++x) {
-            uint sum = src[x-2] + 3*src[x-1] + 8*src[x] + 3*src[x+1] + src[x+2];
-            dst[x] = (uchar) (sum >> 4);
-        }
-        dst[width - 2] = dst[width - 1] = 0;
-        src += pitch;
-        dst += pitch;
-    }
-}
-
 static QFontEngine::SubpixelAntialiasingType subpixelAntialiasingTypeHint()
 {
     static int type = -1;
@@ -1153,196 +1076,97 @@ QFontEngineFT::Glyph *QFontEngineFT::loadGlyph(QGlyphSet *set, uint glyph,
 
     int glyph_buffer_size = 0;
     QScopedArrayPointer<uchar> glyph_buffer;
-    bool useFreetypeRenderGlyph = false;
-    if (slot->format == FT_GLYPH_FORMAT_OUTLINE && (hsubpixel || vfactor != 1)) {
-        err = FT_Library_SetLcdFilter(slot->library, (FT_LcdFilter)lcdFilterType);
-        // We use FT_Render_Glyph if freetype has support for lcd-filtering
-        // or is version 2.8.1 or higher and can do without.
-        if (err == FT_Err_Ok || qt_getFreetypeData()->hasPatentFreeLcdRendering)
-            useFreetypeRenderGlyph = true;
+    FT_Render_Mode renderMode = (default_hint_style == HintLight) ? FT_RENDER_MODE_LIGHT : FT_RENDER_MODE_NORMAL;
+    switch (format) {
+    case Format_Mono:
+        renderMode = FT_RENDER_MODE_MONO;
+        break;
+    case Format_A32:
+        Q_ASSERT(hsubpixel || vfactor != 1);
+        renderMode = hsubpixel ? FT_RENDER_MODE_LCD : FT_RENDER_MODE_LCD_V;
+        break;
+    case Format_A8:
+    case Format_ARGB:
+        break;
+    default:
+        Q_UNREACHABLE();
     }
-    if (useFreetypeRenderGlyph) {
-        err = FT_Render_Glyph(slot, hsubpixel ? FT_RENDER_MODE_LCD : FT_RENDER_MODE_LCD_V);
-
-        if (err != FT_Err_Ok)
-            qWarning("render glyph failed err=%x face=%p, glyph=%d", err, face, glyph);
-
-        FT_Library_SetLcdFilter(slot->library, FT_LCD_FILTER_NONE);
+    FT_Library_SetLcdFilter(slot->library, (FT_LcdFilter)lcdFilterType);
 
-        info.height = slot->bitmap.rows / vfactor;
-        info.width = hsubpixel ? slot->bitmap.width / 3 : slot->bitmap.width;
-        info.x = slot->bitmap_left;
-        info.y = slot->bitmap_top;
+    err = FT_Render_Glyph(slot, renderMode);
+    if (err != FT_Err_Ok)
+        qWarning("render glyph failed err=%x face=%p, glyph=%d", err, face, glyph);
 
-        glyph_buffer_size = info.width * info.height * 4;
-        glyph_buffer.reset(new uchar[glyph_buffer_size]);
+    FT_Library_SetLcdFilter(slot->library, FT_LCD_FILTER_NONE);
 
-        if (hsubpixel)
-            convertRGBToARGB(slot->bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, slot->bitmap.pitch, subpixelType != Subpixel_RGB, false);
-        else if (vfactor != 1)
-            convertRGBToARGB_V(slot->bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, slot->bitmap.pitch, subpixelType != Subpixel_VRGB, false);
-    } else {
-    int left  = slot->metrics.horiBearingX;
-    int right = slot->metrics.horiBearingX + slot->metrics.width;
-    int top    = slot->metrics.horiBearingY;
-    int bottom = slot->metrics.horiBearingY - slot->metrics.height;
-    if (transform && slot->format != FT_GLYPH_FORMAT_BITMAP)
-        transformBoundingBox(&left, &top, &right, &bottom, &matrix);
-    left = FLOOR(left);
-    right = CEIL(right);
-    bottom = FLOOR(bottom);
-    top = CEIL(top);
-
-    int hpixels = TRUNC(right - left);
-    // subpixel position requires one more pixel
-    if (subPixelPosition > 0 && format != Format_Mono)
-        hpixels++;
-
-    if (hsubpixel)
-        hpixels = hpixels*3 + 8;
-    info.width = hpixels;
-    info.height = TRUNC(top - bottom);
-    info.x = TRUNC(left);
-    info.y = TRUNC(top);
-    if (hsubpixel) {
-        info.width /= 3;
-        info.x -= 1;
-    }
-
-    // If any of the metrics are too large to fit, don't cache them
-    if (areMetricsTooLarge(info))
-        return 0;
+    info.height = slot->bitmap.rows;
+    info.width = slot->bitmap.width;
+    info.x = slot->bitmap_left;
+    info.y = slot->bitmap_top;
+    if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_LCD)
+        info.width = info.width / 3;
+    if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_LCD_V)
+        info.height = info.height / vfactor;
 
     int pitch = (format == Format_Mono ? ((info.width + 31) & ~31) >> 3 :
                  (format == Format_A8 ? (info.width + 3) & ~3 : info.width * 4));
-    if (glyph_buffer_size < pitch * info.height) {
-        glyph_buffer_size = pitch * info.height;
-        glyph_buffer.reset(new uchar[glyph_buffer_size]);
-        memset(glyph_buffer.data(), 0, glyph_buffer_size);
-    }
 
-    if (slot->format == FT_GLYPH_FORMAT_OUTLINE) {
-        FT_Bitmap bitmap;
-        bitmap.rows = info.height*vfactor;
-        bitmap.width = hpixels;
-        bitmap.pitch = format == Format_Mono ? (((info.width + 31) & ~31) >> 3) : ((bitmap.width + 3) & ~3);
-        int bitmap_buffer_size = bitmap.rows * bitmap.pitch;
-        if (!hsubpixel && vfactor == 1 && format != Format_A32) {
-            Q_ASSERT(glyph_buffer_size <= bitmap_buffer_size);
-            bitmap.buffer = glyph_buffer.data();
-        } else {
-            bitmap.buffer = new uchar[bitmap_buffer_size];
-            memset(bitmap.buffer, 0, bitmap_buffer_size);
-        }
-        bitmap.pixel_mode = format == Format_Mono ? FT_PIXEL_MODE_MONO : FT_PIXEL_MODE_GRAY;
-        FT_Matrix matrix;
-        matrix.xx = (hsubpixel ? 3 : 1) << 16;
-        matrix.yy = vfactor << 16;
-        matrix.yx = matrix.xy = 0;
-
-        FT_Outline_Transform(&slot->outline, &matrix);
-        FT_Outline_Translate (&slot->outline, (hsubpixel ? -3*left +(4<<6) : -left), -bottom*vfactor);
-        FT_Outline_Get_Bitmap(slot->library, &slot->outline, &bitmap);
-        if (hsubpixel) {
-            Q_ASSERT (bitmap.pixel_mode == FT_PIXEL_MODE_GRAY);
-            Q_ASSERT(antialias);
-            uchar *convoluted = new uchar[bitmap_buffer_size];
-            bool useLegacyLcdFilter = false;
-            useLegacyLcdFilter = (lcdFilterType == FT_LCD_FILTER_LEGACY);
-            uchar *buffer = bitmap.buffer;
-            if (!useLegacyLcdFilter) {
-                convoluteBitmap(bitmap.buffer, convoluted, bitmap.width, info.height, bitmap.pitch);
-                buffer = convoluted;
-            }
-            convertRGBToARGB(buffer + 1, (uint *)glyph_buffer.data(), info.width, info.height, bitmap.pitch, subpixelType != Subpixel_RGB, useLegacyLcdFilter);
-            delete [] convoluted;
-        } else if (vfactor != 1) {
-            convertRGBToARGB_V(bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, bitmap.pitch, subpixelType != Subpixel_VRGB, true);
-        } else if (format == Format_A32 && bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) {
-            convertGRAYToARGB(bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, bitmap.pitch);
-        }
+    glyph_buffer_size = info.height * pitch;
+    glyph_buffer.reset(new uchar[glyph_buffer_size]);
 
-        if (bitmap.buffer != glyph_buffer.data())
-            delete [] bitmap.buffer;
-    } else if (slot->format == FT_GLYPH_FORMAT_BITMAP) {
-#if ((FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100) >= 20500)
-        Q_ASSERT(slot->bitmap.pixel_mode == FT_PIXEL_MODE_MONO || slot->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA);
-#else
-        Q_ASSERT(slot->bitmap.pixel_mode == FT_PIXEL_MODE_MONO);
-#endif
+    if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_MONO) {
+        Q_ASSERT(format == Format_Mono);
         uchar *src = slot->bitmap.buffer;
         uchar *dst = glyph_buffer.data();
         int h = slot->bitmap.rows;
-        if (format == Format_Mono) {
-            int bytes = ((info.width + 7) & ~7) >> 3;
-            while (h--) {
-                memcpy (dst, src, bytes);
-                dst += pitch;
-                src += slot->bitmap.pitch;
-            }
-        } else if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_MONO) {
-            if (hsubpixel) {
-                while (h--) {
-                    uint *dd = (uint *)dst;
-                    *dd++ = 0;
-                    for (int x = 0; x < static_cast<int>(slot->bitmap.width); x++) {
-                        uint a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xffffff : 0x000000);
-                        *dd++ = a;
-                    }
-                    *dd++ = 0;
-                    dst += pitch;
-                    src += slot->bitmap.pitch;
-                }
-            } else if (vfactor != 1) {
-                while (h--) {
-                    uint *dd = (uint *)dst;
-                    for (int x = 0; x < static_cast<int>(slot->bitmap.width); x++) {
-                        uint a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xffffff : 0x000000);
-                        *dd++ = a;
-                    }
-                    dst += pitch;
-                    src += slot->bitmap.pitch;
-                }
-            } else {
-                while (h--) {
-                    for (int x = 0; x < static_cast<int>(slot->bitmap.width); x++) {
-                        unsigned char a = ((src[x >> 3] & (0x80 >> (x & 7))) ? 0xff : 0x00);
-                        dst[x] = a;
-                    }
-                    dst += pitch;
-                    src += slot->bitmap.pitch;
-                }
-            }
+
+        int bytes = ((info.width + 7) & ~7) >> 3;
+        while (h--) {
+            memcpy (dst, src, bytes);
+            dst += pitch;
+            src += slot->bitmap.pitch;
         }
-#if ((FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100) >= 20500)
-        else if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA)
-        {
-            while (h--) {
+    } else if (slot->bitmap.pixel_mode == 7 /*FT_PIXEL_MODE_BGRA*/) {
+        Q_ASSERT(format == Format_ARGB);
+        uchar *src = slot->bitmap.buffer;
+        uchar *dst = glyph_buffer.data();
+        int h = slot->bitmap.rows;
+        while (h--) {
 #if Q_BYTE_ORDER == Q_BIG_ENDIAN
-                const quint32 *srcPixel = (const quint32 *)src;
-                quint32 *dstPixel = (quint32 *)dst;
-                for (int x = 0; x < static_cast<int>(slot->bitmap.width); x++, srcPixel++, dstPixel++) {
-                    const quint32 pixel = *srcPixel;
-                    *dstPixel = qbswap(pixel);
-                }
+            const quint32 *srcPixel = (const quint32 *)src;
+            quint32 *dstPixel = (quint32 *)dst;
+            for (int x = 0; x < static_cast<int>(slot->bitmap.width); x++, srcPixel++, dstPixel++) {
+                const quint32 pixel = *srcPixel;
+                *dstPixel = qbswap(pixel);
+            }
 #else
-                memcpy(dst, src, slot->bitmap.width * 4);
+            memcpy(dst, src, slot->bitmap.width * 4);
 #endif
-                dst += slot->bitmap.pitch;
-                src += slot->bitmap.pitch;
-            }
-            info.width = info.linearAdvance = info.xOff = slot->bitmap.width;
-            info.height = slot->bitmap.rows;
-            info.x = slot->bitmap_left;
-            info.y = slot->bitmap_top;
+            dst += slot->bitmap.pitch;
+            src += slot->bitmap.pitch;
         }
-#endif
+        info.linearAdvance = info.xOff = slot->bitmap.width;
+    } else if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) {
+        Q_ASSERT(format == Format_A8);
+        uchar *src = slot->bitmap.buffer;
+        uchar *dst = glyph_buffer.data();
+        int h = slot->bitmap.rows;
+        int bytes = info.width;
+        while (h--) {
+            memcpy (dst, src, bytes);
+            dst += pitch;
+            src += slot->bitmap.pitch;
+        }
+    } else if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_LCD) {
+        Q_ASSERT(format == Format_A32);
+        convertRGBToARGB(slot->bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, slot->bitmap.pitch, subpixelType != Subpixel_RGB);
+    } else if (slot->bitmap.pixel_mode == FT_PIXEL_MODE_LCD_V) {
+        Q_ASSERT(format == Format_A32);
+        convertRGBToARGB_V(slot->bitmap.buffer, (uint *)glyph_buffer.data(), info.width, info.height, slot->bitmap.pitch, subpixelType != Subpixel_VRGB);
     } else {
-        qWarning("QFontEngine: Glyph neither outline nor bitmap format=%d", slot->format);
+        qWarning("QFontEngine: Glyph rendered in unknown pixel_mode=%d", slot->bitmap.pixel_mode);
         return 0;
     }
-    }
-
 
     if (!g) {
         g = new Glyph;
@@ -1556,7 +1380,7 @@ QFontEngineFT::QGlyphSet *QFontEngineFT::loadGlyphSet(const QTransform &matrix)
         gs = &transformedGlyphSets[0];
         gs->clear();
         gs->transformationMatrix = m;
-        gs->outline_drawing = fontDef.pixelSize * fontDef.pixelSize * qAbs(matrix.det()) >= QT_MAX_CACHED_GLYPH_SIZE * QT_MAX_CACHED_GLYPH_SIZE;
+        gs->outline_drawing = fontDef.pixelSize * fontDef.pixelSize * qAbs(matrix.determinant()) > QT_MAX_CACHED_GLYPH_SIZE * QT_MAX_CACHED_GLYPH_SIZE;
     }
     Q_ASSERT(gs != 0);
 
diff --git a/src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h b/src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h
index d498b0ac8b..2d1d5e6572 100644
--- a/src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h
+++ b/src/platformsupport/fontdatabases/freetype/qfontengine_ft_p.h
@@ -268,7 +268,7 @@ private:
     inline bool isScalableBitmap() const { return freetype->isScalableBitmap(); }
 
     inline Glyph *loadGlyph(uint glyph, QFixed subPixelPosition, GlyphFormat format = Format_None, bool fetchMetricsOnly = false, bool disableOutlineDrawing = false) const
-    { return loadGlyph(cacheEnabled ? &defaultGlyphSet : 0, glyph, subPixelPosition, format, fetchMetricsOnly, disableOutlineDrawing); }
+    { return loadGlyph(cacheEnabled ? &defaultGlyphSet : nullptr, glyph, subPixelPosition, format, fetchMetricsOnly, disableOutlineDrawing); }
     Glyph *loadGlyph(QGlyphSet *set, uint glyph, QFixed subPixelPosition, GlyphFormat = Format_None, bool fetchMetricsOnly = false, bool disableOutlineDrawing = false) const;
     Glyph *loadGlyphFor(glyph_t g, QFixed subPixelPosition, GlyphFormat format, const QTransform &t, bool fetchBoundingBox = false, bool disableOutlineDrawing = false);
 
diff --git a/src/platformsupport/fontdatabases/mac/coretext.pri b/src/platformsupport/fontdatabases/mac/coretext.pri
index af75aa3281..95b9926e65 100644
--- a/src/platformsupport/fontdatabases/mac/coretext.pri
+++ b/src/platformsupport/fontdatabases/mac/coretext.pri
@@ -1,12 +1,6 @@
 HEADERS += $$PWD/qcoretextfontdatabase_p.h $$PWD/qfontengine_coretext_p.h
 OBJECTIVE_SOURCES += $$PWD/qfontengine_coretext.mm $$PWD/qcoretextfontdatabase.mm
 
-qtConfig(freetype) {
-    QMAKE_USE_PRIVATE += freetype
-    HEADERS += freetype/qfontengine_ft_p.h
-    SOURCES += freetype/qfontengine_ft.cpp
-}
-
 LIBS_PRIVATE += \
     -framework CoreFoundation \
     -framework CoreGraphics \
diff --git a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
index 5ac28ce798..047773d8e3 100644
--- a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
+++ b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
@@ -50,7 +50,9 @@
 
 #include "qcoretextfontdatabase_p.h"
 #include "qfontengine_coretext_p.h"
+#if QT_CONFIG(settings)
 #include <QtCore/QSettings>
+#endif
 #include <QtCore/QtEndian>
 #ifndef QT_NO_FREETYPE
 #include <QtFontDatabaseSupport/private/qfontengine_ft_p.h>
@@ -115,67 +117,6 @@ static NSInteger languageMapSort(id obj1, id obj2, void *context)
 QCoreTextFontDatabase::QCoreTextFontDatabase()
     : m_hasPopulatedAliases(false)
 {
-#ifdef Q_OS_MACX
-    QSettings appleSettings(QLatin1String("apple.com"));
-    QVariant appleValue = appleSettings.value(QLatin1String("AppleAntiAliasingThreshold"));
-    if (appleValue.isValid())
-        QCoreTextFontEngine::antialiasingThreshold = appleValue.toInt();
-
-    /*
-        font_smoothing = 0 means no smoothing, while 1-3 means subpixel
-        antialiasing with different hinting styles (but we don't care about the
-        exact value, only if subpixel rendering is available or not)
-    */
-    int font_smoothing = 0;
-    appleValue = appleSettings.value(QLatin1String("AppleFontSmoothing"));
-    if (appleValue.isValid()) {
-        font_smoothing = appleValue.toInt();
-    } else {
-        // non-Apple displays do not provide enough information about subpixel rendering so
-        // draw text with cocoa and compare pixel colors to see if subpixel rendering is enabled
-        int w = 10;
-        int h = 10;
-        NSRect rect = NSMakeRect(0.0, 0.0, w, h);
-        NSImage *fontImage = [[NSImage alloc] initWithSize:NSMakeSize(w, h)];
-
-        [fontImage lockFocus];
-
-        [[NSColor whiteColor] setFill];
-        NSRectFill(rect);
-
-        NSString *str = @"X\\";
-        NSFont *font = [NSFont fontWithName:@"Helvetica" size:10.0];
-        NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
-        [attrs setObject:font forKey:NSFontAttributeName];
-        [attrs setObject:[NSColor blackColor] forKey:NSForegroundColorAttributeName];
-
-        [str drawInRect:rect withAttributes:attrs];
-
-        NSBitmapImageRep *nsBitmapImage = [[NSBitmapImageRep alloc] initWithFocusedViewRect:rect];
-
-        [fontImage unlockFocus];
-
-        float red, green, blue;
-        for (int x = 0; x < w; x++) {
-            for (int y = 0; y < h; y++) {
-                NSColor *pixelColor = [nsBitmapImage colorAtX:x y:y];
-                red = [pixelColor redComponent];
-                green = [pixelColor greenComponent];
-                blue = [pixelColor blueComponent];
-                if (red != green || red != blue)
-                    font_smoothing = 1;
-            }
-        }
-
-        [nsBitmapImage release];
-        [fontImage release];
-    }
-    QCoreTextFontEngine::defaultGlyphFormat = (font_smoothing > 0
-                                               ? QFontEngine::Format_A32
-                                               : QFontEngine::Format_A8);
-#else
-    QCoreTextFontEngine::defaultGlyphFormat = QFontEngine::Format_A8;
-#endif
 }
 
 QCoreTextFontDatabase::~QCoreTextFontDatabase()
@@ -253,7 +194,7 @@ struct FontDescription {
     QFont::Weight weight;
     QFont::Style style;
     QFont::Stretch stretch;
-    int pixelSize;
+    qreal pointSize;
     bool fixedPitch;
     QSupportedWritingSystems writingSystems;
 };
@@ -269,7 +210,7 @@ Q_DECL_UNUSED static inline QDebug operator<<(QDebug debug, const FontDescriptio
         << ", weight=" << fd.weight
         << ", style=" << fd.style
         << ", stretch=" << fd.stretch
-        << ", pixelSize=" << fd.pixelSize
+        << ", pointSize=" << fd.pointSize
         << ", fixedPitch=" << fd.fixedPitch
         << ", writingSystems=" << fd.writingSystems
     << ")";
@@ -345,9 +286,11 @@ static void getFontDescription(CTFontDescriptorRef font, FontDescription *fd)
         if (CFNumberIsFloatType(size)) {
             double d;
             CFNumberGetValue(size, kCFNumberDoubleType, &d);
-            fd->pixelSize = d;
+            fd->pointSize = d;
         } else {
-            CFNumberGetValue(size, kCFNumberIntType, &fd->pixelSize);
+            int i;
+            CFNumberGetValue(size, kCFNumberIntType, &i);
+            fd->pointSize = i;
         }
     }
 
@@ -375,8 +318,8 @@ void QCoreTextFontDatabase::populateFromDescriptor(CTFontDescriptorRef font, con
 
     CFRetain(font);
     QPlatformFontDatabase::registerFont(family, fd.styleName, fd.foundryName, fd.weight, fd.style, fd.stretch,
-            true /* antialiased */, true /* scalable */,
-            fd.pixelSize, fd.fixedPitch, fd.writingSystems, (void *) font);
+            true /* antialiased */, true /* scalable */, 0 /* pixelSize, ignored as font is scalable */,
+            fd.fixedPitch, fd.writingSystems, (void *)font);
 }
 
 static NSString * const kQtFontDataAttribute = @"QtFontDataAttribute";
@@ -786,7 +729,7 @@ QFont *QCoreTextFontDatabase::themeFont(QPlatformTheme::Font f) const
     else
         CFRelease(fontDesc);
 
-    QFont *font = new QFont(fd.familyName, fd.pixelSize, fd.weight, fd.style == QFont::StyleItalic);
+    QFont *font = new QFont(fd.familyName, fd.pointSize, fd.weight, fd.style == QFont::StyleItalic);
     return font;
 }
 
diff --git a/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm b/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
index 6543759a3d..25e7c6df72 100644
--- a/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
+++ b/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
@@ -41,9 +41,11 @@
 
 #include <qpa/qplatformfontdatabase.h>
 #include <QtCore/qendian.h>
+#if QT_CONFIG(settings)
 #include <QtCore/qsettings.h>
+#endif
 #include <QtCore/qoperatingsystemversion.h>
-
+#include <private/qcoregraphics_p.h>
 #include <private/qimage_p.h>
 
 #include <cmath>
@@ -83,6 +85,8 @@
 
 QT_BEGIN_NAMESPACE
 
+Q_LOGGING_CATEGORY(lcQpaFonts, "qt.qpa.fonts")
+
 static float SYNTHETIC_ITALIC_SKEW = std::tan(14.f * std::acos(0.f) / 90.f);
 
 bool QCoreTextFontEngine::ct_getSfntTable(void *user_data, uint tag, uchar *buffer, uint *length)
@@ -131,42 +135,6 @@ QFont::Weight QCoreTextFontEngine::qtWeightFromCFWeight(float value)
     return ret;
 }
 
-static void loadAdvancesForGlyphs(CTFontRef ctfont,
-                                  QVarLengthArray<CGGlyph> &cgGlyphs,
-                                  QGlyphLayout *glyphs, int len,
-                                  QFontEngine::ShaperFlags flags,
-                                  const QFontDef &fontDef)
-{
-    Q_UNUSED(flags);
-    QVarLengthArray<CGSize> advances(len);
-    CTFontGetAdvancesForGlyphs(ctfont, kCTFontOrientationHorizontal, cgGlyphs.data(), advances.data(), len);
-
-    for (int i = 0; i < len; ++i) {
-        if (glyphs->glyphs[i] & 0xff000000)
-            continue;
-        glyphs->advances[i] = QFixed::fromReal(advances[i].width);
-    }
-
-    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
-        for (int i = 0; i < len; ++i)
-            glyphs->advances[i] = glyphs->advances[i].round();
-    }
-}
-
-static float getTraitValue(CFDictionaryRef allTraits, CFStringRef trait)
-{
-    if (CFDictionaryContainsKey(allTraits, trait)) {
-        CFNumberRef traitNum = (CFNumberRef) CFDictionaryGetValue(allTraits, trait);
-        float v = 0;
-        CFNumberGetValue(traitNum, kCFNumberFloatType, &v);
-        return v;
-    }
-    return 0;
-}
-
-int QCoreTextFontEngine::antialiasingThreshold = 0;
-QFontEngine::GlyphFormat QCoreTextFontEngine::defaultGlyphFormat = QFontEngine::Format_A32;
-
 CGAffineTransform qt_transform_from_fontdef(const QFontDef &fontDef)
 {
     CGAffineTransform transform = CGAffineTransformIdentity;
@@ -221,38 +189,36 @@ QCoreTextFontEngine *QCoreTextFontEngine::create(const QByteArray &fontData, qre
 }
 
 QCoreTextFontEngine::QCoreTextFontEngine(CTFontRef font, const QFontDef &def)
-    : QFontEngine(Mac)
+    : QCoreTextFontEngine(def)
 {
-    fontDef = def;
-    transform = qt_transform_from_fontdef(fontDef);
-    ctfont = font;
-    CFRetain(ctfont);
-    cgFont = CTFontCopyGraphicsFont(font, NULL);
+    ctfont = QCFType<CTFontRef>::constructFromGet(font);
+    cgFont = CTFontCopyGraphicsFont(font, nullptr);
     init();
 }
 
 QCoreTextFontEngine::QCoreTextFontEngine(CGFontRef font, const QFontDef &def)
+    : QCoreTextFontEngine(def)
+{
+    cgFont = QCFType<CGFontRef>::constructFromGet(font);
+    ctfont = CTFontCreateWithGraphicsFont(font, fontDef.pixelSize, &transform, nullptr);
+    init();
+}
+
+QCoreTextFontEngine::QCoreTextFontEngine(const QFontDef &def)
     : QFontEngine(Mac)
 {
     fontDef = def;
     transform = qt_transform_from_fontdef(fontDef);
-    cgFont = font;
-    // Keep reference count balanced
-    CFRetain(cgFont);
-    ctfont = CTFontCreateWithGraphicsFont(font, fontDef.pixelSize, &transform, NULL);
-    init();
 }
 
 QCoreTextFontEngine::~QCoreTextFontEngine()
 {
-    CFRelease(cgFont);
-    CFRelease(ctfont);
 }
 
 void QCoreTextFontEngine::init()
 {
-    Q_ASSERT(ctfont != NULL);
-    Q_ASSERT(cgFont != NULL);
+    Q_ASSERT(ctfont);
+    Q_ASSERT(cgFont);
 
     face_id.index = 0;
     QCFString name = CTFontCopyName(ctfont, kCTFontUniqueNameKey);
@@ -269,18 +235,29 @@ void QCoreTextFontEngine::init()
 
     if (traits & kCTFontColorGlyphsTrait)
         glyphFormat = QFontEngine::Format_ARGB;
+    else if (shouldSmoothFont() && fontSmoothing() == FontSmoothing::Subpixel)
+        glyphFormat = QFontEngine::Format_A32;
     else
-        glyphFormat = defaultGlyphFormat;
+        glyphFormat = QFontEngine::Format_A8;
 
     if (traits & kCTFontItalicTrait)
         fontDef.style = QFont::StyleItalic;
 
-    CFDictionaryRef allTraits = CTFontCopyTraits(ctfont);
+    static const auto getTraitValue = [](CFDictionaryRef allTraits, CFStringRef trait) -> float {
+        if (CFDictionaryContainsKey(allTraits, trait)) {
+            CFNumberRef traitNum = (CFNumberRef) CFDictionaryGetValue(allTraits, trait);
+            float v = 0;
+            CFNumberGetValue(traitNum, kCFNumberFloatType, &v);
+            return v;
+        }
+        return 0;
+    };
+
+    QCFType<CFDictionaryRef> allTraits = CTFontCopyTraits(ctfont);
     fontDef.weight = QCoreTextFontEngine::qtWeightFromCFWeight(getTraitValue(allTraits, kCTFontWeightTrait));
     int slant = static_cast<int>(getTraitValue(allTraits, kCTFontSlantTrait) * 500 + 500);
     if (slant > 500 && !(traits & kCTFontItalicTrait))
         fontDef.style = QFont::StyleOblique;
-    CFRelease(allTraits);
 
     if (fontDef.weight >= QFont::Bold && !(traits & kCTFontBoldTrait))
         synthesisFlags |= SynthesizedBold;
@@ -359,22 +336,9 @@ bool QCoreTextFontEngine::stringToCMap(const QChar *str, int len, QGlyphLayout *
     *nglyphs = glyph_pos;
     glyphs->numGlyphs = glyph_pos;
 
-    if (flags & GlyphIndicesOnly)
-        return true;
-
-    QVarLengthArray<CGSize> advances(glyph_pos);
-    CTFontGetAdvancesForGlyphs(ctfont, kCTFontOrientationHorizontal, cgGlyphs.data(), advances.data(), glyph_pos);
-
-    for (int i = 0; i < glyph_pos; ++i) {
-        if (glyphs->glyphs[i] & 0xff000000)
-            continue;
-        glyphs->advances[i] = QFixed::fromReal(advances[i].width);
-    }
+    if (!(flags & GlyphIndicesOnly))
+        loadAdvancesForGlyphs(cgGlyphs, glyphs);
 
-    if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
-        for (int i = 0; i < glyph_pos; ++i)
-            glyphs->advances[i] = glyphs->advances[i].round();
-    }
     return true;
 }
 
@@ -469,6 +433,11 @@ qreal QCoreTextFontEngine::maxCharWidth() const
     return bb.xoff.toReal();
 }
 
+bool QCoreTextFontEngine::hasColorGlyphs() const
+{
+    return glyphFormat == QFontEngine::Format_ARGB;
+}
+
 void QCoreTextFontEngine::draw(CGContextRef ctx, qreal x, qreal y, const QTextItemInt &ti, int paintDeviceHeight)
 {
     QVarLengthArray<QFixedPoint> positions;
@@ -522,9 +491,11 @@ void QCoreTextFontEngine::draw(CGContextRef ctx, qreal x, qreal y, const QTextIt
 
 struct ConvertPathInfo
 {
-    ConvertPathInfo(QPainterPath *newPath, const QPointF &newPos) : path(newPath), pos(newPos) {}
+    ConvertPathInfo(QPainterPath *newPath, const QPointF &newPos, qreal newStretch = 1.0) :
+        path(newPath), pos(newPos), stretch(newStretch) {}
     QPainterPath *path;
     QPointF pos;
+    qreal stretch;
 };
 
 static void convertCGPathToQPainterPath(void *info, const CGPathElement *element)
@@ -532,32 +503,32 @@ static void convertCGPathToQPainterPath(void *info, const CGPathElement *element
     ConvertPathInfo *myInfo = static_cast<ConvertPathInfo *>(info);
     switch(element->type) {
         case kCGPathElementMoveToPoint:
-            myInfo->path->moveTo(element->points[0].x + myInfo->pos.x(),
+            myInfo->path->moveTo((element->points[0].x * myInfo->stretch) + myInfo->pos.x(),
                                  element->points[0].y + myInfo->pos.y());
             break;
         case kCGPathElementAddLineToPoint:
-            myInfo->path->lineTo(element->points[0].x + myInfo->pos.x(),
+            myInfo->path->lineTo((element->points[0].x * myInfo->stretch) + myInfo->pos.x(),
                                  element->points[0].y + myInfo->pos.y());
             break;
         case kCGPathElementAddQuadCurveToPoint:
-            myInfo->path->quadTo(element->points[0].x + myInfo->pos.x(),
+            myInfo->path->quadTo((element->points[0].x * myInfo->stretch) + myInfo->pos.x(),
                                  element->points[0].y + myInfo->pos.y(),
-                                 element->points[1].x + myInfo->pos.x(),
+                                 (element->points[1].x * myInfo->stretch) + myInfo->pos.x(),
                                  element->points[1].y + myInfo->pos.y());
             break;
         case kCGPathElementAddCurveToPoint:
-            myInfo->path->cubicTo(element->points[0].x + myInfo->pos.x(),
+            myInfo->path->cubicTo((element->points[0].x * myInfo->stretch) + myInfo->pos.x(),
                                   element->points[0].y + myInfo->pos.y(),
-                                  element->points[1].x + myInfo->pos.x(),
+                                  (element->points[1].x * myInfo->stretch) + myInfo->pos.x(),
                                   element->points[1].y + myInfo->pos.y(),
-                                  element->points[2].x + myInfo->pos.x(),
+                                  (element->points[2].x * myInfo->stretch) + myInfo->pos.x(),
                                   element->points[2].y + myInfo->pos.y());
             break;
         case kCGPathElementCloseSubpath:
             myInfo->path->closeSubpath();
             break;
         default:
-            qDebug() << "Unhandled path transform type: " << element->type;
+            qCWarning(lcQpaFonts) << "Unhandled path transform type: " << element->type;
     }
 
 }
@@ -565,7 +536,7 @@ static void convertCGPathToQPainterPath(void *info, const CGPathElement *element
 void QCoreTextFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nGlyphs,
                                           QPainterPath *path, QTextItem::RenderFlags)
 {
-    if (glyphFormat == QFontEngine::Format_ARGB)
+    if (hasColorGlyphs())
         return; // We can't convert color-glyphs to path
 
     CGAffineTransform cgMatrix = CGAffineTransformIdentity;
@@ -574,9 +545,10 @@ void QCoreTextFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *position
     if (synthesisFlags & QFontEngine::SynthesizedItalic)
         cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMake(1, 0, -SYNTHETIC_ITALIC_SKEW, 1, 0, 0));
 
+    qreal stretch = fontDef.stretch ? qreal(fontDef.stretch) / 100 : 1.0;
     for (int i = 0; i < nGlyphs; ++i) {
         QCFType<CGPathRef> cgpath = CTFontCreatePathForGlyph(ctfont, glyphs[i], &cgMatrix);
-        ConvertPathInfo info(path, positions[i].toPointF());
+        ConvertPathInfo info(path, positions[i].toPointF(), stretch);
         CGPathApply(cgpath, &info, convertCGPathToQPainterPath);
     }
 }
@@ -645,66 +617,190 @@ glyph_metrics_t QCoreTextFontEngine::alphaMapBoundingBox(glyph_t glyph, QFixed s
     return br;
 }
 
+/*
+    Apple has gone through many iterations of its font smoothing algorithms,
+    and there are many ways to enable or disable certain aspects of it. As
+    keeping up with all the different toggles and behavior differences between
+    macOS versions is tricky, we resort to rendering a single glyph in a few
+    configurations, picking up the font smoothing algorithm from the observed
+    result.
+
+    The possible values are:
+
+     - Disabled: No font smoothing is applied.
+
+       Possibly triggered by the user unchecking the "Use font smoothing when
+       available" checkbox in the system preferences or setting AppleFontSmoothing
+       to 0. Also controlled by the CGContextSetAllowsFontSmoothing() API,
+       which gets its default from the settings above. This API overrides
+       the more granular CGContextSetShouldSmoothFonts(), which we use to
+       enable (request) or disable font smoothing.
+
+       Note that this does not exclude normal antialiasing, controlled by
+       the CGContextSetShouldAntialias() API.
+
+     - Subpixel: Font smoothing is applied, and affects subpixels.
+
+       This was the default mode on macOS versions prior to 10.14 (Mojave).
+       The font dilation (stem darkening) parameters were controlled by the
+       AppleFontSmoothing setting, ranging from 1 to 3 (light to strong).
+
+       On Mojave it is no longer supported, but can be triggered by a legacy
+       override (CGFontRenderingFontSmoothingDisabled=NO), so we need to
+       still account for it, otherwise users will have a bad time.
+
+     - Grayscale: Font smoothing is applied, but does not affect subpixels.
+
+       This is the default mode on macOS 10.14 (Mojave). The font dilation
+       (stem darkening) parameters are not affected by the AppleFontSmoothing
+       setting, but are instead computed based on the fill color used when
+       drawing the glyphs (white fill gives a lighter dilation than black
+       fill). This affects how we build our glyph cache, since we produce
+       alpha maps by drawing white on black.
+*/
+QCoreTextFontEngine::FontSmoothing QCoreTextFontEngine::fontSmoothing()
+{
+    static const FontSmoothing cachedFontSmoothing = [] {
+        static const int kSize = 10;
+        QCFType<CTFontRef> font = CTFontCreateWithName(CFSTR("Helvetica"), kSize, nullptr);
+
+        UniChar character('X'); CGGlyph glyph;
+        CTFontGetGlyphsForCharacters(font, &character, &glyph, 1);
+
+        auto drawGlyph = [&](bool smooth) -> QImage {
+            QImage image(kSize, kSize, QImage::Format_RGB32);
+            image.fill(0);
+
+            QMacCGContext ctx(&image);
+            CGContextSetTextDrawingMode(ctx, kCGTextFill);
+            CGContextSetGrayFillColor(ctx, 1, 1);
+
+            // Will be ignored if CGContextSetAllowsFontSmoothing() has been
+            // set to false by CoreGraphics based on user defaults.
+            CGContextSetShouldSmoothFonts(ctx, smooth);
+
+            CTFontDrawGlyphs(font, &glyph, &CGPointZero, 1, ctx);
+            return image;
+        };
+
+        QImage nonSmoothed = drawGlyph(false);
+        QImage smoothed = drawGlyph(true);
+
+        FontSmoothing fontSmoothing = FontSmoothing::Disabled;
+        [&] {
+            for (int x = 0; x < kSize; ++x) {
+                for (int y = 0; y < kSize; ++y) {
+                    QRgb sp = smoothed.pixel(x, y);
+                    if (qRed(sp) != qGreen(sp) || qRed(sp) != qBlue(sp)) {
+                        fontSmoothing = FontSmoothing::Subpixel;
+                        return;
+                    }
+
+                    if (sp != nonSmoothed.pixel(x, y))
+                        fontSmoothing = FontSmoothing::Grayscale;
+                }
+            }
+        }();
+
+        auto defaults = [NSUserDefaults standardUserDefaults];
+        qCDebug(lcQpaFonts) << "Resolved font smoothing algorithm. Defaults ="
+            << [[defaults dictionaryRepresentation] dictionaryWithValuesForKeys:@[
+                @"AppleFontSmoothing",
+                @"CGFontRenderingFontSmoothingDisabled"
+            ]] << "Result =" << fontSmoothing;
+
+        return fontSmoothing;
+    }();
+
+    return cachedFontSmoothing;
+}
+
+bool QCoreTextFontEngine::shouldAntialias() const
+{
+    return !(fontDef.styleStrategy & QFont::NoAntialias);
+}
+
+bool QCoreTextFontEngine::shouldSmoothFont() const
+{
+    if (hasColorGlyphs())
+        return false;
+
+    if (!shouldAntialias())
+        return false;
+
+    switch (fontSmoothing()) {
+    case Disabled: return false;
+    case Subpixel: return !(fontDef.styleStrategy & QFont::NoSubpixelAntialias);
+    case Grayscale: return true;
+    }
+
+    Q_UNREACHABLE();
+}
+
 bool QCoreTextFontEngine::expectsGammaCorrectedBlending() const
 {
-    // Only works well when font-smoothing is enabled
-    return (glyphFormat == Format_A32) && !(fontDef.styleStrategy & (QFont::NoAntialias | QFont::NoSubpixelAntialias));
+    return shouldSmoothFont() && fontSmoothing() == Subpixel;
 }
 
-QImage QCoreTextFontEngine::imageForGlyph(glyph_t glyph, QFixed subPixelPosition, bool aa, const QTransform &matrix)
+qreal QCoreTextFontEngine::fontSmoothingGamma()
+{
+    return 2.0;
+}
+
+QImage QCoreTextFontEngine::imageForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &matrix)
 {
     glyph_metrics_t br = alphaMapBoundingBox(glyph, subPixelPosition, matrix, glyphFormat);
 
-    bool isColorGlyph = glyphFormat == QFontEngine::Format_ARGB;
-    QImage::Format imageFormat = isColorGlyph ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+    QImage::Format imageFormat = hasColorGlyphs() ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
     QImage im(br.width.ceil().toInt(), br.height.ceil().toInt(), imageFormat);
     if (!im.width() || !im.height())
         return im;
 
+    QCFType<CGColorSpaceRef> colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
+    QCFType<CGContextRef> ctx = CGBitmapContextCreate(im.bits(), im.width(), im.height(),
+                                             8, im.bytesPerLine(), colorspace,
+                                             qt_mac_bitmapInfoForImage(im));
+    Q_ASSERT(ctx);
+
+    CGContextSetShouldAntialias(ctx, shouldAntialias());
+
+    const bool shouldSmooth = shouldSmoothFont();
+    CGContextSetShouldSmoothFonts(ctx, shouldSmooth);
+
 #if defined(Q_OS_MACOS)
-    CGColorRef glyphColor = CGColorGetConstantColor(kCGColorWhite);
-    if (QOperatingSystemVersion::current() >= QOperatingSystemVersion::MacOSMojave) {
-        // macOS 10.14 uses a new font smoothing algorithm that takes the fill color into
-        // account. This means our default approach of drawing white on black to produce
-        // the alpha map will result in non-native looking text when then drawn as black
-        // on white during the final blit. As a workaround we use the application's current
-        // appearance to decide whether to draw with white or black fill, and then invert
-        // the glyph image in the latter case, producing an alpha map. This covers the
-        // most common use-cases, but longer term we should propagate the fill color all
-        // the way from the paint engine, and include it in the key for the glyph cache.
-        if (!qt_mac_applicationIsInDarkMode())
-            glyphColor = CGColorGetConstantColor(kCGColorBlack);
-    }
-    const bool blackOnWhiteGlyphs = !isColorGlyph
-            && CGColorEqualToColor(glyphColor, CGColorGetConstantColor(kCGColorBlack));
+    auto glyphColor = [&] {
+        if (shouldSmooth && fontSmoothing() == Grayscale) {
+            // The grayscale font smoothing algorithm introduced in macOS Mojave (10.14) adjusts
+            // its dilation (stem darkening) parameters based on the fill color. This means our
+            // default approach of drawing white on black to produce the alpha map will result
+            // in non-native looking text when then drawn as black on white during the final blit.
+            // As a workaround we use the application's current appearance to decide whether to
+            // draw with white or black fill, and then invert the glyph image in the latter case,
+            // producing an alpha map. This covers the most common use-cases, but longer term we
+            // should propagate the fill color all the way from the paint engine, and include it
+            //in the key for the glyph cache.
+
+            if (!qt_mac_applicationIsInDarkMode())
+                return kCGColorBlack;
+        }
+        return kCGColorWhite;
+    }();
+
+    const bool blackOnWhiteGlyphs = glyphColor == kCGColorBlack;
     if (blackOnWhiteGlyphs)
         im.fill(Qt::white);
     else
 #endif
-        im.fill(0); // Faster than Qt::black
-
-    CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
-    uint cgflags = isColorGlyph ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst;
-#ifdef kCGBitmapByteOrder32Host //only needed because CGImage.h added symbols in the minor version
-    cgflags |= kCGBitmapByteOrder32Host;
-#endif
+        im.fill(0);
 
-    CGContextRef ctx = CGBitmapContextCreate(im.bits(), im.width(), im.height(),
-                                             8, im.bytesPerLine(), colorspace,
-                                             cgflags);
-    Q_ASSERT(ctx);
     CGContextSetFontSize(ctx, fontDef.pixelSize);
-    const bool antialias = (aa || fontDef.pointSize > antialiasingThreshold) && !(fontDef.styleStrategy & QFont::NoAntialias);
-    CGContextSetShouldAntialias(ctx, antialias);
-    const bool smoothing = antialias && !(fontDef.styleStrategy & QFont::NoSubpixelAntialias);
-    CGContextSetShouldSmoothFonts(ctx, smoothing);
 
     CGAffineTransform cgMatrix = CGAffineTransformIdentity;
 
     if (synthesisFlags & QFontEngine::SynthesizedItalic)
         cgMatrix = CGAffineTransformConcat(cgMatrix, CGAffineTransformMake(1, 0, SYNTHETIC_ITALIC_SKEW, 1, 0, 0));
 
-    if (!isColorGlyph) // CTFontDrawGlyphs incorporates the font's matrix already
+    if (!hasColorGlyphs()) // CTFontDrawGlyphs incorporates the font's matrix already
         cgMatrix = CGAffineTransformConcat(cgMatrix, transform);
 
     if (matrix.isScaling())
@@ -714,10 +810,10 @@ QImage QCoreTextFontEngine::imageForGlyph(glyph_t glyph, QFixed subPixelPosition
     qreal pos_x = -br.x.truncate() + subPixelPosition.toReal();
     qreal pos_y = im.height() + br.y.toReal();
 
-    if (!isColorGlyph) {
+    if (!hasColorGlyphs()) {
         CGContextSetTextMatrix(ctx, cgMatrix);
 #if defined(Q_OS_MACOS)
-        CGContextSetFillColorWithColor(ctx, glyphColor);
+        CGContextSetFillColorWithColor(ctx, CGColorGetConstantColor(glyphColor));
 #else
         CGContextSetRGBFillColor(ctx, 1, 1, 1, 1);
 #endif
@@ -742,8 +838,8 @@ QImage QCoreTextFontEngine::imageForGlyph(glyph_t glyph, QFixed subPixelPosition
         CTFontDrawGlyphs(ctfont, &cgGlyph, &CGPointZero, 1, ctx);
     }
 
-    CGContextRelease(ctx);
-    CGColorSpaceRelease(colorspace);
+    if (expectsGammaCorrectedBlending())
+        qGamma_correct_back_to_linear_cs(&im);
 
 #if defined(Q_OS_MACOS)
     if (blackOnWhiteGlyphs)
@@ -763,7 +859,7 @@ QImage QCoreTextFontEngine::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosit
     if (x.type() > QTransform::TxScale)
         return QFontEngine::alphaMapForGlyph(glyph, subPixelPosition, x);
 
-    QImage im = imageForGlyph(glyph, subPixelPosition, false, x);
+    QImage im = imageForGlyph(glyph, subPixelPosition, x);
 
     QImage alphaMap(im.width(), im.height(), QImage::Format_Alpha8);
 
@@ -785,9 +881,7 @@ QImage QCoreTextFontEngine::alphaRGBMapForGlyph(glyph_t glyph, QFixed subPixelPo
     if (x.type() > QTransform::TxScale)
         return QFontEngine::alphaRGBMapForGlyph(glyph, subPixelPosition, x);
 
-    QImage im = imageForGlyph(glyph, subPixelPosition, true, x);
-    qGamma_correct_back_to_linear_cs(&im);
-    return im;
+    return imageForGlyph(glyph, subPixelPosition, x);
 }
 
 QImage QCoreTextFontEngine::bitmapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t)
@@ -795,22 +889,35 @@ QImage QCoreTextFontEngine::bitmapForGlyph(glyph_t glyph, QFixed subPixelPositio
     if (t.type() > QTransform::TxScale)
         return QFontEngine::bitmapForGlyph(glyph, subPixelPosition, t);
 
-    return imageForGlyph(glyph, subPixelPosition, true, t);
+    return imageForGlyph(glyph, subPixelPosition, t);
 }
 
 void QCoreTextFontEngine::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags flags) const
 {
-    int i, numGlyphs = glyphs->numGlyphs;
+    Q_UNUSED(flags);
+
+    const int numGlyphs = glyphs->numGlyphs;
     QVarLengthArray<CGGlyph> cgGlyphs(numGlyphs);
 
-    for (i = 0; i < numGlyphs; ++i) {
-        if (glyphs->glyphs[i] & 0xff000000)
-            cgGlyphs[i] = 0;
-        else
-            cgGlyphs[i] = glyphs->glyphs[i];
+    for (int i = 0; i < numGlyphs; ++i) {
+        Q_ASSERT(!QFontEngineMulti::highByte(glyphs->glyphs[i]));
+        cgGlyphs[i] = glyphs->glyphs[i];
     }
 
-    loadAdvancesForGlyphs(ctfont, cgGlyphs, glyphs, numGlyphs, flags, fontDef);
+    loadAdvancesForGlyphs(cgGlyphs, glyphs);
+}
+
+void QCoreTextFontEngine::loadAdvancesForGlyphs(QVarLengthArray<CGGlyph> &cgGlyphs, QGlyphLayout *glyphs) const
+{
+    const int numGlyphs = glyphs->numGlyphs;
+    QVarLengthArray<CGSize> advances(numGlyphs);
+    CTFontGetAdvancesForGlyphs(ctfont, kCTFontOrientationHorizontal, cgGlyphs.data(), advances.data(), numGlyphs);
+
+    for (int i = 0; i < numGlyphs; ++i) {
+        QFixed advance = QFixed::fromReal(advances[i].width);
+        glyphs->advances[i] = fontDef.styleStrategy & QFont::ForceIntegerMetrics
+                                    ? advance.round() : advance;
+    }
 }
 
 QFontEngine::FaceId QCoreTextFontEngine::faceId() const
@@ -867,7 +974,7 @@ QFontEngine *QCoreTextFontEngine::cloneWithSize(qreal pixelSize) const
 
 Qt::HANDLE QCoreTextFontEngine::handle() const
 {
-    return (Qt::HANDLE)ctfont;
+    return (Qt::HANDLE)(static_cast<CTFontRef>(ctfont));
 }
 
 bool QCoreTextFontEngine::supportsTransformation(const QTransform &transform) const
diff --git a/src/platformsupport/fontdatabases/mac/qfontengine_coretext_p.h b/src/platformsupport/fontdatabases/mac/qfontengine_coretext_p.h
index b77aaa27c1..4064507058 100644
--- a/src/platformsupport/fontdatabases/mac/qfontengine_coretext_p.h
+++ b/src/platformsupport/fontdatabases/mac/qfontengine_coretext_p.h
@@ -53,6 +53,7 @@
 
 #include <private/qfontengine_p.h>
 #include <private/qcore_mac_p.h>
+#include <QtCore/qloggingcategory.h>
 
 #ifdef Q_OS_OSX
 #include <ApplicationServices/ApplicationServices.h>
@@ -63,8 +64,12 @@
 
 QT_BEGIN_NAMESPACE
 
+Q_DECLARE_LOGGING_CATEGORY(lcQpaFonts)
+
 class QCoreTextFontEngine : public QFontEngine
 {
+    Q_GADGET
+
 public:
     QCoreTextFontEngine(CTFontRef font, const QFontDef &def);
     QCoreTextFontEngine(CGFontRef font, const QFontDef &def);
@@ -118,18 +123,28 @@ public:
 
     QFontEngine::Properties properties() const override;
 
+    enum FontSmoothing { Disabled, Subpixel, Grayscale };
+    Q_ENUM(FontSmoothing);
+
+    static FontSmoothing fontSmoothing();
+    static qreal fontSmoothingGamma();
+
     static bool ct_getSfntTable(void *user_data, uint tag, uchar *buffer, uint *length);
     static QFont::Weight qtWeightFromCFWeight(float value);
 
-    static int antialiasingThreshold;
-    static QFontEngine::GlyphFormat defaultGlyphFormat;
-
     static QCoreTextFontEngine *create(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference);
+
 protected:
+    QCoreTextFontEngine(const QFontDef &def);
     void init();
-    QImage imageForGlyph(glyph_t glyph, QFixed subPixelPosition, bool colorful, const QTransform &m);
-    CTFontRef ctfont;
-    CGFontRef cgFont;
+    QImage imageForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &m);
+    void loadAdvancesForGlyphs(QVarLengthArray<CGGlyph> &cgGlyphs, QGlyphLayout *glyphs) const;
+    bool hasColorGlyphs() const;
+    bool shouldAntialias() const;
+    bool shouldSmoothFont() const;
+
+    QCFType<CTFontRef> ctfont;
+    QCFType<CGFontRef> cgFont;
     int synthesisFlags;
     CGAffineTransform transform;
     QFixed avgCharWidth;
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp
index 00a0643dd1..b1ba84fe14 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp
@@ -1264,11 +1264,6 @@ QWindowsFontDatabase::~QWindowsFontDatabase()
     removeApplicationFonts();
 }
 
-QFontEngineMulti *QWindowsFontDatabase::fontEngineMulti(QFontEngine *fontEngine, QChar::Script script)
-{
-    return new QWindowsMultiFontEngine(fontEngine, script);
-}
-
 QFontEngine * QWindowsFontDatabase::fontEngine(const QFontDef &fontDef, void *handle)
 {
     const QString faceName(static_cast<const QChar*>(handle));
@@ -1434,8 +1429,8 @@ QT_WARNING_POP
                     reinterpret_cast<const OS2Table *>(fontData.constData()
                                                        + qFromBigEndian<quint32>(os2TableEntry->offset));
 
-            bool italic = qFromBigEndian<quint16>(os2Table->selection) & 1;
-            bool oblique = qFromBigEndian<quint16>(os2Table->selection) & 128;
+            bool italic = qFromBigEndian<quint16>(os2Table->selection)  & (1 << 0);
+            bool oblique = qFromBigEndian<quint16>(os2Table->selection) & (1 << 9);
 
             if (italic)
                 fontEngine->fontDef.style = QFont::StyleItalic;
@@ -1490,7 +1485,8 @@ static void getFontTable(const uchar *fileBegin, const uchar *data, quint32 tag,
 
 static void getFamiliesAndSignatures(const QByteArray &fontData,
                                      QList<QFontNames> *families,
-                                     QVector<FONTSIGNATURE> *signatures)
+                                     QVector<FONTSIGNATURE> *signatures,
+                                     QVector<QFontValues> *values)
 {
     const uchar *data = reinterpret_cast<const uchar *>(fontData.constData());
 
@@ -1509,11 +1505,27 @@ static void getFamiliesAndSignatures(const QByteArray &fontData,
         if (names.name.isEmpty())
             continue;
 
-        families->append(qMove(names));
+        families->append(std::move(names));
+
+        if (values || signatures)
+            getFontTable(data, font, MAKE_TAG('O', 'S', '/', '2'), &table, &length);
+
+        if (values) {
+            QFontValues fontValues;
+            if (table && length >= 64) {
+                // Read in some details about the font, offset calculated based on the specification
+                fontValues.weight = qFromBigEndian<quint16>(table + 4);
+
+                quint16 fsSelection = qFromBigEndian<quint16>(table + 62);
+                fontValues.isItalic = (fsSelection & 1) != 0;
+                fontValues.isUnderlined = (fsSelection & (1 << 1)) != 0;
+                fontValues.isOverstruck = (fsSelection & (1 << 4)) != 0;
+            }
+            values->append(std::move(fontValues));
+        }
 
         if (signatures) {
             FONTSIGNATURE signature;
-            getFontTable(data, font, MAKE_TAG('O', 'S', '/', '2'), &table, &length);
             if (table && length >= 86) {
                 // Offsets taken from OS/2 table in the TrueType spec
                 signature.fsUsb[0] = qFromBigEndian<quint32>(table + 42);
@@ -1536,11 +1548,12 @@ QStringList QWindowsFontDatabase::addApplicationFont(const QByteArray &fontData,
     WinApplicationFont font;
     font.fileName = fileName;
     QVector<FONTSIGNATURE> signatures;
+    QVector<QFontValues> fontValues;
     QList<QFontNames> families;
     QStringList familyNames;
 
     if (!fontData.isEmpty()) {
-        getFamiliesAndSignatures(fontData, &families, &signatures);
+        getFamiliesAndSignatures(fontData, &families, &signatures, &fontValues);
         if (families.isEmpty())
             return familyNames;
 
@@ -1553,14 +1566,23 @@ QStringList QWindowsFontDatabase::addApplicationFont(const QByteArray &fontData,
 
         // Memory fonts won't show up in enumeration, so do add them the hard way.
         for (int j = 0; j < families.count(); ++j) {
-            const QString familyName = families.at(j).name;
-            const QString styleName = families.at(j).style;
+            const auto &family = families.at(j);
+            const QString &familyName = family.name;
+            const QString &styleName = family.style;
             familyNames << familyName;
             HDC hdc = GetDC(0);
             LOGFONT lf;
             memset(&lf, 0, sizeof(LOGFONT));
             memcpy(lf.lfFaceName, familyName.utf16(), sizeof(wchar_t) * qMin(LF_FACESIZE - 1, familyName.size()));
             lf.lfCharSet = DEFAULT_CHARSET;
+            const QFontValues &values = fontValues.at(j);
+            lf.lfWeight = values.weight;
+            if (values.isItalic)
+                lf.lfItalic = TRUE;
+            if (values.isOverstruck)
+                lf.lfStrikeOut = TRUE;
+            if (values.isUnderlined)
+                lf.lfUnderline = TRUE;
             HFONT hfont = CreateFontIndirect(&lf);
             HGDIOBJ oldobj = SelectObject(hdc, hfont);
 
@@ -1581,7 +1603,7 @@ QStringList QWindowsFontDatabase::addApplicationFont(const QByteArray &fontData,
         QByteArray data = f.readAll();
         f.close();
 
-        getFamiliesAndSignatures(data, &families, 0);
+        getFamiliesAndSignatures(data, &families, nullptr, nullptr);
         if (families.isEmpty())
             return QStringList();
 
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
index f68ea54dcf..db2186644b 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_ft.cpp
@@ -115,30 +115,33 @@ static FontKeys &fontKeys()
 {
     static FontKeys result;
     if (result.isEmpty()) {
-        const QSettings fontRegistry(QStringLiteral("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts"),
-                                     QSettings::NativeFormat);
-        const QStringList allKeys = fontRegistry.allKeys();
-        const QString trueType = QStringLiteral("(TrueType)");
+        const QStringList keys = { QStringLiteral("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts"),
+                                   QStringLiteral("HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts") };
+        for (const auto key : keys) {
+            const QSettings fontRegistry(key, QSettings::NativeFormat);
+            const QStringList allKeys = fontRegistry.allKeys();
+            const QString trueType = QStringLiteral("(TrueType)");
 #if QT_CONFIG(regularexpression)
-        const QRegularExpression sizeListMatch(QStringLiteral("\\s(\\d+,)+\\d+"));
+            const QRegularExpression sizeListMatch(QStringLiteral("\\s(\\d+,)+\\d+"));
 #else
-        const QRegExp sizeListMatch(QLatin1String("\\s(\\d+,)+\\d+"));
+            const QRegExp sizeListMatch(QLatin1String("\\s(\\d+,)+\\d+"));
 #endif
-        Q_ASSERT(sizeListMatch.isValid());
-        const int size = allKeys.size();
-        result.reserve(size);
-        for (int i = 0; i < size; ++i) {
-            FontKey fontKey;
-            const QString &registryFontKey = allKeys.at(i);
-            fontKey.fileName = fontRegistry.value(registryFontKey).toString();
-            QString realKey = registryFontKey;
-            realKey.remove(trueType);
-            realKey.remove(sizeListMatch);
-            const auto fontNames = QStringRef(&realKey).trimmed().split(QLatin1Char('&'));
-            fontKey.fontNames.reserve(fontNames.size());
-            for (const QStringRef &fontName : fontNames)
-                fontKey.fontNames.append(fontName.trimmed().toString());
-            result.append(fontKey);
+            Q_ASSERT(sizeListMatch.isValid());
+            const int size = allKeys.size();
+            result.reserve(result.size() + size);
+            for (int i = 0; i < size; ++i) {
+                FontKey fontKey;
+                const QString &registryFontKey = allKeys.at(i);
+                fontKey.fileName = fontRegistry.value(registryFontKey).toString();
+                QString realKey = registryFontKey;
+                realKey.remove(trueType);
+                realKey.remove(sizeListMatch);
+                const auto fontNames = QStringRef(&realKey).trimmed().split(QLatin1Char('&'));
+                fontKey.fontNames.reserve(fontNames.size());
+                for (const QStringRef &fontName : fontNames)
+                    fontKey.fontNames.append(fontName.trimmed().toString());
+                result.append(fontKey);
+            }
         }
     }
     return result;
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h
index ab6d6307c7..b85a2dceee 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h
@@ -67,7 +67,7 @@ Q_DECLARE_LOGGING_CATEGORY(lcQpaFonts)
 
 class QWindowsFontEngineData
 {
-    Q_DISABLE_COPY(QWindowsFontEngineData)
+    Q_DISABLE_COPY_MOVE(QWindowsFontEngineData)
 public:
     QWindowsFontEngineData();
     ~QWindowsFontEngineData();
@@ -85,7 +85,7 @@ public:
 
 class QWindowsFontDatabase : public QPlatformFontDatabase
 {
-    Q_DISABLE_COPY(QWindowsFontDatabase)
+    Q_DISABLE_COPY_MOVE(QWindowsFontDatabase)
 public:
     enum FontOptions {
         // Relevant bits from QWindowsIntegration::Options
@@ -98,7 +98,6 @@ public:
 
     void populateFontDatabase() override;
     void populateFamily(const QString &familyName) override;
-    QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QChar::Script script) override;
     QFontEngine *fontEngine(const QFontDef &fontDef, void *handle) override;
     QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference) override;
     QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const override;
@@ -177,6 +176,14 @@ struct QFontNames
     QString preferredStyle; // e.g. "Condensed Italic"
 };
 
+struct QFontValues
+{
+    quint16 weight = 0;
+    bool isItalic = false;
+    bool isOverstruck = false;
+    bool isUnderlined = false;
+};
+
 bool qt_localizedName(const QString &name);
 QString qt_getEnglishName(const QString &familyName, bool includeStyle = false);
 QFontNames qt_getCanonicalFontNames(const LOGFONT &lf);
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontengine.cpp b/src/platformsupport/fontdatabases/windows/qwindowsfontengine.cpp
index 2a41209225..2ae378c558 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontengine.cpp
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontengine.cpp
@@ -702,8 +702,8 @@ static inline double qt_fixed_to_double(const FIXED &p) {
     return ((p.value << 16) + p.fract) / 65536.0;
 }
 
-static inline QPointF qt_to_qpointf(const POINTFX &pt, qreal scale) {
-    return QPointF(qt_fixed_to_double(pt.x) * scale, -qt_fixed_to_double(pt.y) * scale);
+static inline QPointF qt_to_qpointf(const POINTFX &pt, qreal scale, qreal stretch) {
+    return QPointF(qt_fixed_to_double(pt.x) * scale * stretch, -qt_fixed_to_double(pt.y) * scale);
 }
 
 #ifndef GGO_UNHINTED
@@ -711,7 +711,8 @@ static inline QPointF qt_to_qpointf(const POINTFX &pt, qreal scale) {
 #endif
 
 static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
-                           QPainterPath *path, bool ttf, glyph_metrics_t *metric = 0, qreal scale = 1)
+                           QPainterPath *path, bool ttf, glyph_metrics_t *metric = 0,
+                           qreal scale = 1.0, qreal stretch = 1.0)
 {
     MAT2 mat;
     mat.eM11.value = mat.eM22.value = 1;
@@ -761,7 +762,7 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
     while (headerOffset < bufferSize) {
         const TTPOLYGONHEADER *ttph = reinterpret_cast<const TTPOLYGONHEADER *>(dataBuffer + headerOffset);
 
-        QPointF lastPoint(qt_to_qpointf(ttph->pfxStart, scale));
+        QPointF lastPoint(qt_to_qpointf(ttph->pfxStart, scale, stretch));
         path->moveTo(lastPoint + oset);
         offset += sizeof(TTPOLYGONHEADER);
         while (offset < headerOffset + ttph->cb) {
@@ -769,7 +770,7 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
             switch (curve->wType) {
             case TT_PRIM_LINE: {
                 for (int i=0; i<curve->cpfx; ++i) {
-                    QPointF p = qt_to_qpointf(curve->apfx[i], scale) + oset;
+                    QPointF p = qt_to_qpointf(curve->apfx[i], scale, stretch) + oset;
                     path->lineTo(p);
                 }
                 break;
@@ -779,8 +780,8 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
                 QPointF prev(elm.x, elm.y);
                 QPointF endPoint;
                 for (int i=0; i<curve->cpfx - 1; ++i) {
-                    QPointF p1 = qt_to_qpointf(curve->apfx[i], scale) + oset;
-                    QPointF p2 = qt_to_qpointf(curve->apfx[i+1], scale) + oset;
+                    QPointF p1 = qt_to_qpointf(curve->apfx[i], scale, stretch) + oset;
+                    QPointF p2 = qt_to_qpointf(curve->apfx[i+1], scale, stretch) + oset;
                     if (i < curve->cpfx - 2) {
                         endPoint = QPointF((p1.x() + p2.x()) / 2, (p1.y() + p2.y()) / 2);
                     } else {
@@ -795,9 +796,9 @@ static bool addGlyphToPath(glyph_t glyph, const QFixedPoint &position, HDC hdc,
             }
             case TT_PRIM_CSPLINE: {
                 for (int i=0; i<curve->cpfx; ) {
-                    QPointF p2 = qt_to_qpointf(curve->apfx[i++], scale) + oset;
-                    QPointF p3 = qt_to_qpointf(curve->apfx[i++], scale) + oset;
-                    QPointF p4 = qt_to_qpointf(curve->apfx[i++], scale) + oset;
+                    QPointF p2 = qt_to_qpointf(curve->apfx[i++], scale, stretch) + oset;
+                    QPointF p3 = qt_to_qpointf(curve->apfx[i++], scale, stretch) + oset;
+                    QPointF p4 = qt_to_qpointf(curve->apfx[i++], scale, stretch) + oset;
                     path->cubicTo(p2, p3, p4);
                 }
                 break;
@@ -829,9 +830,11 @@ void QWindowsFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions
     HDC hdc = m_fontEngineData->hdc;
     HGDIOBJ oldfont = SelectObject(hdc, hf);
 
+    qreal scale = qreal(fontDef.pixelSize) / unitsPerEm;
+    qreal stretch = fontDef.stretch ? qreal(fontDef.stretch) / 100 : 1.0;
     for(int i = 0; i < nglyphs; ++i) {
         if (!addGlyphToPath(glyphs[i], positions[i], hdc, path, ttf, /*metric*/0,
-                            qreal(fontDef.pixelSize) / unitsPerEm)) {
+                            scale, stretch)) {
             // Some windows fonts, like "Modern", are vector stroke
             // fonts, which are reported as TMPF_VECTOR but do not
             // support GetGlyphOutline, and thus we set this bit so
@@ -1199,120 +1202,6 @@ void QWindowsFontEngine::initFontInfo(const QFontDef &request,
     }
 }
 
-/*!
-    \class QWindowsMultiFontEngine
-    \brief Standard Windows Multi font engine.
-    \internal
-    \ingroup qt-lighthouse-win
-
-    "Merges" several font engines that have gaps in the
-    supported writing systems.
-
-    Will probably be superseded by a common Free Type font engine in Qt 5.X.
-*/
-QWindowsMultiFontEngine::QWindowsMultiFontEngine(QFontEngine *fe, int script)
-    : QFontEngineMulti(fe, script)
-{
-}
-
-#ifndef QT_NO_DIRECTWRITE
-static QString msgDirectWriteFunctionFailed(HRESULT hr, const char *function,
-                                            const QString &fam, const QString &substitute)
-{
-    _com_error error(hr);
-    QString result;
-    QTextStream str(&result);
-    str << function << " failed for \"" << fam << '"';
-    if (substitute != fam)
-        str << " (substitute: \"" <<  substitute << "\")";
-    str << ": error " << hex << showbase << ulong(hr) << ' ' << noshowbase << dec
-        << ": " << QString::fromWCharArray(error.ErrorMessage());
-    return result;
-}
-#endif // !QT_NO_DIRECTWRITE
-
-QFontEngine *QWindowsMultiFontEngine::loadEngine(int at)
-{
-    QFontEngine *fontEngine = engine(0);
-    QSharedPointer<QWindowsFontEngineData> data;
-    LOGFONT lf;
-
-#ifndef QT_NO_DIRECTWRITE
-    if (fontEngine->type() == QFontEngine::DirectWrite) {
-        QWindowsFontEngineDirectWrite *fe = static_cast<QWindowsFontEngineDirectWrite *>(fontEngine);
-        lf = QWindowsFontDatabase::fontDefToLOGFONT(fe->fontDef, QString());
-
-        data = fe->fontEngineData();
-    } else
-#endif
-    {
-        QWindowsFontEngine *fe = static_cast<QWindowsFontEngine*>(fontEngine);
-        lf = fe->m_logfont;
-
-        data = fe->fontEngineData();
-    }
-
-    const QString fam = fallbackFamilyAt(at - 1);
-    const int faceNameLength = qMin(fam.length(), LF_FACESIZE - 1);
-    memcpy(lf.lfFaceName, fam.utf16(), faceNameLength * sizeof(wchar_t));
-    lf.lfFaceName[faceNameLength] = 0;
-
-#ifndef QT_NO_DIRECTWRITE
-    if (fontEngine->type() == QFontEngine::DirectWrite) {
-        const QString nameSubstitute = QWindowsFontEngineDirectWrite::fontNameSubstitute(fam);
-        if (nameSubstitute != fam) {
-            const int nameSubstituteLength = qMin(nameSubstitute.length(), LF_FACESIZE - 1);
-            memcpy(lf.lfFaceName, nameSubstitute.utf16(), nameSubstituteLength * sizeof(wchar_t));
-            lf.lfFaceName[nameSubstituteLength] = 0;
-        }
-
-        HFONT hfont = CreateFontIndirect(&lf);
-        if (hfont == nullptr) {
-            qErrnoWarning("%s: CreateFontIndirect failed", __FUNCTION__);
-        } else {
-            HGDIOBJ oldFont = SelectObject(data->hdc, hfont);
-
-            IDWriteFontFace *directWriteFontFace = nullptr;
-            QWindowsFontEngineDirectWrite *fedw = nullptr;
-            HRESULT hr = data->directWriteGdiInterop->CreateFontFaceFromHdc(data->hdc, &directWriteFontFace);
-            if (SUCCEEDED(hr)) {
-                Q_ASSERT(directWriteFontFace);
-                fedw = new QWindowsFontEngineDirectWrite(directWriteFontFace,
-                                                         fontEngine->fontDef.pixelSize,
-                                                         data);
-                fedw->fontDef.weight = fontEngine->fontDef.weight;
-                if (fontEngine->fontDef.style > QFont::StyleNormal)
-                    fedw->fontDef.style = fontEngine->fontDef.style;
-                fedw->fontDef.family = fam;
-                fedw->fontDef.hintingPreference = fontEngine->fontDef.hintingPreference;
-                fedw->fontDef.stretch = fontEngine->fontDef.stretch;
-            } else {
-                qWarning("%s: %s", __FUNCTION__,
-                         qPrintable(msgDirectWriteFunctionFailed(hr, "CreateFontFace", fam, nameSubstitute)));
-            }
-
-            SelectObject(data->hdc, oldFont);
-            DeleteObject(hfont);
-
-            if (fedw != nullptr)
-                return fedw;
-        }
-    }
-#endif
-
-    // Get here if original font is not DirectWrite or DirectWrite creation failed for some
-    // reason
-
-    QFontEngine *fe = new QWindowsFontEngine(fam, lf, data);
-    fe->fontDef.weight = fontEngine->fontDef.weight;
-    if (fontEngine->fontDef.style > QFont::StyleNormal)
-        fe->fontDef.style = fontEngine->fontDef.style;
-    fe->fontDef.family = fam;
-    fe->fontDef.hintingPreference = fontEngine->fontDef.hintingPreference;
-    fe->fontDef.stretch = fontEngine->fontDef.stretch;
-    return fe;
-}
-
 bool QWindowsFontEngine::supportsTransformation(const QTransform &transform) const
 {
     // Support all transformations for ttf files, and translations for raster fonts
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontengine_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontengine_p.h
index a151cf7343..b1b9d828ac 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontengine_p.h
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontengine_p.h
@@ -66,9 +66,7 @@ class QWindowsFontEngineData;
 
 class QWindowsFontEngine : public QFontEngine
 {
-    Q_DISABLE_COPY(QWindowsFontEngine)
-    friend class QWindowsMultiFontEngine;
-
+    Q_DISABLE_COPY_MOVE(QWindowsFontEngine)
 public:
     QWindowsFontEngine(const QString &name, LOGFONT lf,
                        const QSharedPointer<QWindowsFontEngineData> &fontEngineData);
@@ -169,14 +167,6 @@ private:
     mutable int designAdvancesSize = 0;
 };
 
-class QWindowsMultiFontEngine : public QFontEngineMulti
-{
-public:
-    explicit QWindowsMultiFontEngine(QFontEngine *fe, int script);
-
-    QFontEngine *loadEngine(int at) override;
-};
-
 QT_END_NAMESPACE
 
 Q_DECLARE_METATYPE(HFONT)
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite.cpp b/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite.cpp
index 57c41938bc..60a5896e7b 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite.cpp
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite.cpp
@@ -69,7 +69,7 @@ namespace {
 
     class GeometrySink: public IDWriteGeometrySink
     {
-        Q_DISABLE_COPY(GeometrySink)
+        Q_DISABLE_COPY_MOVE(GeometrySink)
     public:
         GeometrySink(QPainterPath *path)
             : m_refCount(0), m_path(path)
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h
index 9326f5aece..3eaf8cf3d8 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h
+++ b/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h
@@ -72,7 +72,7 @@ class QWindowsFontEngineData;
 
 class QWindowsFontEngineDirectWrite : public QFontEngine
 {
-    Q_DISABLE_COPY(QWindowsFontEngineDirectWrite)
+    Q_DISABLE_COPY_MOVE(QWindowsFontEngineDirectWrite)
 public:
     explicit QWindowsFontEngineDirectWrite(IDWriteFontFace *directWriteFontFace,
                                     qreal pixelSize,
diff --git a/src/platformsupport/fontdatabases/windows/qwindowsnativeimage_p.h b/src/platformsupport/fontdatabases/windows/qwindowsnativeimage_p.h
index 6c47a527d2..ed68ac2644 100644
--- a/src/platformsupport/fontdatabases/windows/qwindowsnativeimage_p.h
+++ b/src/platformsupport/fontdatabases/windows/qwindowsnativeimage_p.h
@@ -59,7 +59,7 @@ QT_BEGIN_NAMESPACE
 
 class QWindowsNativeImage
 {
-    Q_DISABLE_COPY(QWindowsNativeImage)
+    Q_DISABLE_COPY_MOVE(QWindowsNativeImage)
 public:
     QWindowsNativeImage(int width, int height,
                         QImage::Format format);
diff --git a/src/platformsupport/fontdatabases/windows/windows.pri b/src/platformsupport/fontdatabases/windows/windows.pri
index 0e64084cf1..9c529f55ea 100644
--- a/src/platformsupport/fontdatabases/windows/windows.pri
+++ b/src/platformsupport/fontdatabases/windows/windows.pri
@@ -15,9 +15,14 @@ qtConfig(freetype) {
     HEADERS += $$PWD/qwindowsfontdatabase_ft_p.h
 }
 
-qtConfig(directwrite) {
-    qtConfig(directwrite2): \
+qtConfig(directwrite):qtConfig(direct2d) {
+    qtConfig(directwrite2) {
+        QMAKE_USE_PRIVATE += dwrite_2
         DEFINES *= QT_USE_DIRECTWRITE2
+    } else {
+        QMAKE_USE_PRIVATE += dwrite
+    }
+    QMAKE_USE_PRIVATE += d2d1
 
     SOURCES += $$PWD/qwindowsfontenginedirectwrite.cpp
     HEADERS += $$PWD/qwindowsfontenginedirectwrite_p.h
diff --git a/src/platformsupport/fontdatabases/winrt/winrt.pri b/src/platformsupport/fontdatabases/winrt/winrt.pri
index 291ada220f..7617df2e7a 100644
--- a/src/platformsupport/fontdatabases/winrt/winrt.pri
+++ b/src/platformsupport/fontdatabases/winrt/winrt.pri
@@ -8,4 +8,6 @@ HEADERS += \
 
 DEFINES += __WRL_NO_DEFAULT_LIB__
 
-LIBS += -lws2_32 -ldwrite
+LIBS += -lws2_32
+
+QMAKE_USE_PRIVATE += dwrite_1
diff --git a/src/platformsupport/glxconvenience/glxconvenience.pro b/src/platformsupport/glxconvenience/glxconvenience.pro
index 58fa9fc479..8367dc5e31 100644
--- a/src/platformsupport/glxconvenience/glxconvenience.pro
+++ b/src/platformsupport/glxconvenience/glxconvenience.pro
@@ -6,7 +6,7 @@ CONFIG += static internal_module
 
 DEFINES += QT_NO_CAST_FROM_ASCII
 
-LIBS_PRIVATE += $$QMAKE_LIBS_X11
+QMAKE_USE_PRIVATE += xlib
 
 HEADERS += qglxconvenience_p.h
 SOURCES += qglxconvenience.cpp
diff --git a/src/platformsupport/glxconvenience/qglxconvenience.cpp b/src/platformsupport/glxconvenience/qglxconvenience.cpp
index 8d2e58b57b..6458454336 100644
--- a/src/platformsupport/glxconvenience/qglxconvenience.cpp
+++ b/src/platformsupport/glxconvenience/qglxconvenience.cpp
@@ -42,13 +42,18 @@
 #include <QtCore/QByteArray>
 #include <QtCore/QScopedPointer>
 
+#include <QtCore/qmetatype.h>
+#include <QtCore/qtextstream.h>
 #include "qglxconvenience_p.h"
 
+#include <QtCore/QLoggingCategory>
 #include <QtCore/QVector>
 #include <QtCore/QVarLengthArray>
 
 #include <GL/glxext.h>
 
+Q_LOGGING_CATEGORY(lcGlx, "qt.glx")
+
 enum {
     XFocusOut = FocusOut,
     XFocusIn = FocusIn,
@@ -207,6 +212,7 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
         const int requestedBlue = qMax(0, format.blueBufferSize());
         const int requestedAlpha = qMax(0, format.alphaBufferSize());
 
+        GLXFBConfig compatibleCandidate = nullptr;
         for (int i = 0; i < confcount; i++) {
             GLXFBConfig candidate = configs[i];
 
@@ -218,13 +224,27 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
             }
 
             QXlibPointer<XVisualInfo> visual(glXGetVisualFromFBConfig(display, candidate));
-            if (visual.isNull())
+            int actualRed;
+            int actualGreen;
+            int actualBlue;
+            int actualAlpha;
+            glXGetFBConfigAttrib(display, candidate, GLX_RED_SIZE, &actualRed);
+            glXGetFBConfigAttrib(display, candidate, GLX_GREEN_SIZE, &actualGreen);
+            glXGetFBConfigAttrib(display, candidate, GLX_BLUE_SIZE, &actualBlue);
+            glXGetFBConfigAttrib(display, candidate, GLX_ALPHA_SIZE, &actualAlpha);
+            // Sometimes the visuals don't have a depth that includes the alpha channel.
+            actualAlpha = qMin(actualAlpha, visual->depth - actualRed - actualGreen - actualBlue);
+
+            if (requestedRed && actualRed < requestedRed)
                 continue;
-
-            const int actualRed = qPopulationCount(visual->red_mask);
-            const int actualGreen = qPopulationCount(visual->green_mask);
-            const int actualBlue = qPopulationCount(visual->blue_mask);
-            const int actualAlpha = visual->depth - actualRed - actualGreen - actualBlue;
+            if (requestedGreen && actualGreen < requestedGreen)
+                continue;
+            if (requestedBlue && actualBlue < requestedBlue)
+                continue;
+            if (requestedAlpha && actualAlpha < requestedAlpha)
+                continue;
+            if (!compatibleCandidate) // Only pick up the first compatible one offered by the server
+                compatibleCandidate = candidate;
 
             if (requestedRed && actualRed != requestedRed)
                 continue;
@@ -237,6 +257,11 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
 
             return candidate;
         }
+        if (compatibleCandidate) {
+            qCDebug(lcGlx) << "qglx_findConfig: Found non-matching but compatible FBConfig";
+            return compatibleCandidate;
+        }
+        qCWarning(lcGlx, "qglx_findConfig: Failed to finding matching FBConfig (%d %d %d %d)", requestedRed, requestedGreen, requestedBlue, requestedAlpha);
     } while (qglx_reduceFormat(&format));
 
     return config;
@@ -352,6 +377,18 @@ void qglx_surfaceFormatFromVisualInfo(QSurfaceFormat *format, Display *display,
 bool qglx_reduceFormat(QSurfaceFormat *format)
 {
     Q_ASSERT(format);
+    if (std::max(std::max(format->redBufferSize(), format->greenBufferSize()), format->blueBufferSize()) > 8) {
+        if (format->alphaBufferSize() > 2) {
+            // First try to match 10 10 10 2
+            format->setAlphaBufferSize(2);
+            return true;
+        }
+
+        format->setRedBufferSize(std::min(format->redBufferSize(), 8));
+        format->setGreenBufferSize(std::min(format->greenBufferSize(), 8));
+        format->setBlueBufferSize(std::min(format->blueBufferSize(), 8));
+        return true;
+    }
 
     if (format->redBufferSize() > 1) {
         format->setRedBufferSize(1);
diff --git a/src/platformsupport/input/CMakeLists.txt b/src/platformsupport/input/CMakeLists.txt
index bcd96a9cdb..1ab85ce239 100644
--- a/src/platformsupport/input/CMakeLists.txt
+++ b/src/platformsupport/input/CMakeLists.txt
@@ -1,3 +1,5 @@
+# Generated from input.pro.
+
 find_package(Libinput) # special case
 find_package(XKB) # special case
 find_package(Tslib) # special case
@@ -15,9 +17,13 @@ add_qt_module(InputSupport
         Qt::CorePrivate
         Qt::DeviceDiscoverySupportPrivate
         Qt::GuiPrivate
+    PUBLIC_LIBRARIES
+        Qt::Core
+        Qt::DeviceDiscoverySupport
+        Qt::Gui
 )
 
-#### Keys ignored in scope 1:.:input.pro:<NONE>:
+#### Keys ignored in scope 3:.:.:input-support.pro:<TRUE>:
 # CONFIG = "static" "internal_module"
 # MODULE = "input_support"
 # PRECOMPILED_HEADER = "../../corelib/global/qt_pch.h"
@@ -63,7 +69,7 @@ extend_target(InputSupport CONDITION QT_FEATURE_evdev AND QT_FEATURE_mtdev
 extend_target(InputSupport CONDITION QT_FEATURE_tslib
     SOURCES
         tslib/qtslib.cpp tslib/qtslib_p.h
-    LIBRARIES
+    PUBLIC_LIBRARIES
         PkgConfig::Tslib
 )
 
@@ -80,14 +86,12 @@ extend_target(InputSupport CONDITION QT_FEATURE_libinput
         PkgConfig::Libudev
 )
 
-extend_target(InputSupport CONDITION QT_FEATURE_libinput AND QT_FEATURE_xkbcommon_evdev
+extend_target(InputSupport CONDITION QT_FEATURE_libinput AND QT_FEATURE_xkbcommon
     LIBRARIES
+        Qt::XkbCommonSupportPrivate
         XKB::XKB
-)
-
-extend_target(InputSupport CONDITION QT_FEATURE_libinput AND NOT QT_FEATURE_xkbcommon_evdev
-    DEFINES
-        QT_NO_XKBCOMMON_EVDEV
+    PUBLIC_LIBRARIES
+        Qt::XkbCommonSupport
 )
 
 extend_target(InputSupport CONDITION QT_FEATURE_evdev OR QT_FEATURE_libinput
@@ -101,3 +105,7 @@ extend_target(InputSupport CONDITION QT_FEATURE_integrityhid
     LIBRARIES
         integrityhid
 )
+
+if(QT_FEATURE_xkbcommon)
+    add_subdirectory(xkbcommon)
+endif()
diff --git a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler.cpp b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler.cpp
index b21d5d9ef5..02d6586fe8 100644
--- a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler.cpp
+++ b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler.cpp
@@ -66,7 +66,7 @@ Q_LOGGING_CATEGORY(qLcEvdevKeyMap, "qt.qpa.input.keymap")
 // simple builtin US keymap
 #include "qevdevkeyboard_defaultmap_p.h"
 
-void QFdContainer::reset() Q_DECL_NOTHROW
+void QFdContainer::reset() noexcept
 {
     if (m_fd >= 0)
         qt_safe_close(m_fd);
@@ -76,7 +76,7 @@ void QFdContainer::reset() Q_DECL_NOTHROW
 QEvdevKeyboardHandler::QEvdevKeyboardHandler(const QString &device, QFdContainer &fd, bool disableZap, bool enableCompose, const QString &keymapFile)
     : m_device(device), m_fd(fd.release()), m_notify(nullptr),
       m_modifiers(0), m_composing(0), m_dead_unicode(0xffff),
-      m_no_zap(disableZap), m_do_compose(enableCompose),
+      m_langLock(0), m_no_zap(disableZap), m_do_compose(enableCompose),
       m_keymap(0), m_keymap_size(0), m_keycompose(0), m_keycompose_size(0)
 {
     qCDebug(qLcEvdevKey) << "Create keyboard handler with for device" << device;
@@ -253,6 +253,8 @@ QEvdevKeyboardHandler::KeycodeAction QEvdevKeyboardHandler::processKeycode(quint
             quint8 testmods = m_modifiers;
             if (m_locks[0] /*CapsLock*/ && (m->flags & QEvdevKeyboardMap::IsLetter))
                 testmods ^= QEvdevKeyboardMap::ModShift;
+            if (m_langLock)
+                testmods ^= QEvdevKeyboardMap::ModAltGr;
             if (m->modifiers == testmods)
                 map_withmod = m;
         }
@@ -509,6 +511,8 @@ void QEvdevKeyboardHandler::unloadKeymap()
             m_locks[2] = 1;
         qCDebug(qLcEvdevKey, "numlock=%d , capslock=%d, scrolllock=%d", m_locks[1], m_locks[0], m_locks[2]);
     }
+
+    m_langLock = 0;
 }
 
 bool QEvdevKeyboardHandler::loadKeymap(const QString &file)
@@ -553,7 +557,7 @@ bool QEvdevKeyboardHandler::loadKeymap(const QString &file)
         delete [] qmap_keymap;
         delete [] qmap_keycompose;
 
-        qWarning("Keymap file '%s' can not be loaded.", qPrintable(file));
+        qWarning("Keymap file '%s' cannot be loaded.", qPrintable(file));
         return false;
     }
 
@@ -570,4 +574,9 @@ bool QEvdevKeyboardHandler::loadKeymap(const QString &file)
     return true;
 }
 
+void QEvdevKeyboardHandler::switchLang()
+{
+    m_langLock ^= 1;
+}
+
 QT_END_NAMESPACE
diff --git a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler_p.h b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler_p.h
index 7c64c4febb..d154c30ed5 100644
--- a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler_p.h
+++ b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardhandler_p.h
@@ -132,15 +132,15 @@ inline QDataStream &operator<<(QDataStream &ds, const QEvdevKeyboardMap::Composi
 class QFdContainer
 {
     int m_fd;
-    Q_DISABLE_COPY(QFdContainer);
+    Q_DISABLE_COPY_MOVE(QFdContainer);
 public:
-    explicit QFdContainer(int fd = -1) Q_DECL_NOTHROW : m_fd(fd) {}
+    explicit QFdContainer(int fd = -1) noexcept : m_fd(fd) {}
     ~QFdContainer() { reset(); }
 
-    int get() const Q_DECL_NOTHROW { return m_fd; }
+    int get() const noexcept { return m_fd; }
 
-    int release() Q_DECL_NOTHROW { int result = m_fd; m_fd = -1; return result; }
-    void reset() Q_DECL_NOTHROW;
+    int release() noexcept { int result = m_fd; m_fd = -1; return result; }
+    void reset() noexcept;
 };
 
 class QEvdevKeyboardHandler : public QObject
@@ -192,6 +192,8 @@ public:
     void readKeycode();
     KeycodeAction processKeycode(quint16 keycode, bool pressed, bool autorepeat);
 
+    void switchLang();
+
 private:
     void processKeyEvent(int nativecode, int unicode, int qtcode,
                          Qt::KeyboardModifiers modifiers, bool isPress, bool autoRepeat);
@@ -206,6 +208,7 @@ private:
     quint8 m_locks[3];
     int m_composing;
     quint16 m_dead_unicode;
+    quint8 m_langLock;
 
     bool m_no_zap;
     bool m_do_compose;
diff --git a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager.cpp b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager.cpp
index 85e6a80879..e1659bc0d9 100644
--- a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager.cpp
+++ b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager.cpp
@@ -153,4 +153,10 @@ void QEvdevKeyboardManager::loadKeymap(const QString &file)
     }
 }
 
+void QEvdevKeyboardManager::switchLang()
+{
+    foreach (QEvdevKeyboardHandler *handler, m_keyboards)
+        handler->switchLang();
+}
+
 QT_END_NAMESPACE
diff --git a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager_p.h b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager_p.h
index 27ea7e468e..01b7e9fc0e 100644
--- a/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager_p.h
+++ b/src/platformsupport/input/evdevkeyboard/qevdevkeyboardmanager_p.h
@@ -64,10 +64,11 @@ QT_BEGIN_NAMESPACE
 class QEvdevKeyboardManager : public QObject
 {
 public:
-    QEvdevKeyboardManager(const QString &key, const QString &specification, QObject *parent = 0);
+    QEvdevKeyboardManager(const QString &key, const QString &specification, QObject *parent = nullptr);
     ~QEvdevKeyboardManager();
 
     void loadKeymap(const QString &file);
+    void switchLang();
 
     void addKeyboard(const QString &deviceNode = QString());
     void removeKeyboard(const QString &deviceNode);
diff --git a/src/platformsupport/input/evdevmouse/qevdevmousemanager_p.h b/src/platformsupport/input/evdevmouse/qevdevmousemanager_p.h
index 13a8e3dec5..c63ca29a71 100644
--- a/src/platformsupport/input/evdevmouse/qevdevmousemanager_p.h
+++ b/src/platformsupport/input/evdevmouse/qevdevmousemanager_p.h
@@ -65,7 +65,7 @@ class QDeviceDiscovery;
 class QEvdevMouseManager : public QObject
 {
 public:
-    QEvdevMouseManager(const QString &key, const QString &specification, QObject *parent = 0);
+    QEvdevMouseManager(const QString &key, const QString &specification, QObject *parent = nullptr);
     ~QEvdevMouseManager();
 
     void handleMouseEvent(int x, int y, bool abs, Qt::MouseButtons buttons,
diff --git a/src/platformsupport/input/evdevtablet/qevdevtablethandler_p.h b/src/platformsupport/input/evdevtablet/qevdevtablethandler_p.h
index 66e821117a..b83bb21258 100644
--- a/src/platformsupport/input/evdevtablet/qevdevtablethandler_p.h
+++ b/src/platformsupport/input/evdevtablet/qevdevtablethandler_p.h
@@ -64,7 +64,7 @@ class QEvdevTabletData;
 class QEvdevTabletHandler : public QObject
 {
 public:
-    explicit QEvdevTabletHandler(const QString &device, const QString &spec = QString(), QObject *parent = 0);
+    explicit QEvdevTabletHandler(const QString &device, const QString &spec = QString(), QObject *parent = nullptr);
     ~QEvdevTabletHandler();
 
     qint64 deviceId() const;
@@ -83,7 +83,7 @@ private:
 class QEvdevTabletHandlerThread : public QDaemonThread
 {
 public:
-    explicit QEvdevTabletHandlerThread(const QString &device, const QString &spec, QObject *parent = 0);
+    explicit QEvdevTabletHandlerThread(const QString &device, const QString &spec, QObject *parent = nullptr);
     ~QEvdevTabletHandlerThread();
     void run() override;
     QEvdevTabletHandler *handler() { return m_handler; }
diff --git a/src/platformsupport/input/evdevtablet/qevdevtabletmanager_p.h b/src/platformsupport/input/evdevtablet/qevdevtabletmanager_p.h
index cde91c55aa..b598156e52 100644
--- a/src/platformsupport/input/evdevtablet/qevdevtabletmanager_p.h
+++ b/src/platformsupport/input/evdevtablet/qevdevtabletmanager_p.h
@@ -63,7 +63,7 @@ class QEvdevTabletHandlerThread;
 class QEvdevTabletManager : public QObject
 {
 public:
-    QEvdevTabletManager(const QString &key, const QString &spec, QObject *parent = 0);
+    QEvdevTabletManager(const QString &key, const QString &spec, QObject *parent = nullptr);
     ~QEvdevTabletManager();
 
     void addDevice(const QString &deviceNode);
diff --git a/src/platformsupport/input/evdevtouch/qevdevtouchmanager_p.h b/src/platformsupport/input/evdevtouch/qevdevtouchmanager_p.h
index e524c516f1..b9b772fb3a 100644
--- a/src/platformsupport/input/evdevtouch/qevdevtouchmanager_p.h
+++ b/src/platformsupport/input/evdevtouch/qevdevtouchmanager_p.h
@@ -63,7 +63,7 @@ class QEvdevTouchScreenHandlerThread;
 class QEvdevTouchManager : public QObject
 {
 public:
-    QEvdevTouchManager(const QString &key, const QString &spec, QObject *parent = 0);
+    QEvdevTouchManager(const QString &key, const QString &spec, QObject *parent = nullptr);
     ~QEvdevTouchManager();
 
     void addDevice(const QString &deviceNode);
diff --git a/src/platformsupport/input/input-support.pro b/src/platformsupport/input/input-support.pro
new file mode 100644
index 0000000000..3d39210b9e
--- /dev/null
+++ b/src/platformsupport/input/input-support.pro
@@ -0,0 +1,35 @@
+TARGET = QtInputSupport
+MODULE = input_support
+
+QT = core-private gui-private devicediscovery_support-private
+CONFIG += static internal_module
+
+DEFINES += QT_NO_CAST_FROM_ASCII
+PRECOMPILED_HEADER = ../../corelib/global/qt_pch.h
+
+qtConfig(evdev) {
+    include($$PWD/evdevmouse/evdevmouse.pri)
+    include($$PWD/evdevkeyboard/evdevkeyboard.pri)
+    include($$PWD/evdevtouch/evdevtouch.pri)
+    qtConfig(tabletevent) {
+        include($$PWD/evdevtablet/evdevtablet.pri)
+    }
+}
+
+qtConfig(tslib) {
+    include($$PWD/tslib/tslib.pri)
+}
+
+qtConfig(libinput) {
+    include($$PWD/libinput/libinput.pri)
+}
+
+qtConfig(evdev)|qtConfig(libinput) {
+    include($$PWD/shared/shared.pri)
+}
+
+qtConfig(integrityhid) {
+    include($$PWD/integrityhid/integrityhid.pri)
+}
+
+load(qt_module)
diff --git a/src/platformsupport/input/input.pro b/src/platformsupport/input/input.pro
index 3d39210b9e..138c04dea3 100644
--- a/src/platformsupport/input/input.pro
+++ b/src/platformsupport/input/input.pro
@@ -1,35 +1,8 @@
-TARGET = QtInputSupport
-MODULE = input_support
+TEMPLATE = subdirs
+QT_FOR_CONFIG += gui-private
 
-QT = core-private gui-private devicediscovery_support-private
-CONFIG += static internal_module
+qtConfig(xkbcommon): SUBDIRS += xkbcommon
 
-DEFINES += QT_NO_CAST_FROM_ASCII
-PRECOMPILED_HEADER = ../../corelib/global/qt_pch.h
+SUBDIRS += input-support.pro ### FIXME - QTBUG-52657
 
-qtConfig(evdev) {
-    include($$PWD/evdevmouse/evdevmouse.pri)
-    include($$PWD/evdevkeyboard/evdevkeyboard.pri)
-    include($$PWD/evdevtouch/evdevtouch.pri)
-    qtConfig(tabletevent) {
-        include($$PWD/evdevtablet/evdevtablet.pri)
-    }
-}
-
-qtConfig(tslib) {
-    include($$PWD/tslib/tslib.pri)
-}
-
-qtConfig(libinput) {
-    include($$PWD/libinput/libinput.pri)
-}
-
-qtConfig(evdev)|qtConfig(libinput) {
-    include($$PWD/shared/shared.pri)
-}
-
-qtConfig(integrityhid) {
-    include($$PWD/integrityhid/integrityhid.pri)
-}
-
-load(qt_module)
+CONFIG += ordered
diff --git a/src/platformsupport/input/libinput/libinput.pri b/src/platformsupport/input/libinput/libinput.pri
index f922769a37..f80b5f41d9 100644
--- a/src/platformsupport/input/libinput/libinput.pri
+++ b/src/platformsupport/input/libinput/libinput.pri
@@ -14,7 +14,7 @@ QMAKE_USE_PRIVATE += libudev libinput
 
 INCLUDEPATH += $$PWD/../shared
 
-qtConfig(xkbcommon-evdev): \
-    QMAKE_USE_PRIVATE += xkbcommon_evdev
-else: \
-    DEFINES += QT_NO_XKBCOMMON_EVDEV
+qtConfig(xkbcommon): {
+    QMAKE_USE_PRIVATE += xkbcommon
+    QT += xkbcommon_support-private
+}
diff --git a/src/platformsupport/input/libinput/qlibinputkeyboard.cpp b/src/platformsupport/input/libinput/qlibinputkeyboard.cpp
index 5152725468..6586b084f1 100644
--- a/src/platformsupport/input/libinput/qlibinputkeyboard.cpp
+++ b/src/platformsupport/input/libinput/qlibinputkeyboard.cpp
@@ -44,9 +44,10 @@
 #include <QtGui/private/qinputdevicemanager_p.h>
 #include <qpa/qwindowsysteminterface.h>
 #include <libinput.h>
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
 #include <xkbcommon/xkbcommon-keysyms.h>
 #include <xkbcommon/xkbcommon-names.h>
+#include <QtXkbCommonSupport/private/qxkbcommon_p.h>
 #endif
 
 QT_BEGIN_NAMESPACE
@@ -56,90 +57,9 @@ Q_DECLARE_LOGGING_CATEGORY(qLcLibInput)
 const int REPEAT_DELAY = 500;
 const int REPEAT_RATE = 100;
 
-#ifndef QT_NO_XKBCOMMON_EVDEV
-struct KeyTabEntry {
-    int xkbkey;
-    int qtkey;
-};
-
-static inline bool operator==(const KeyTabEntry &a, const KeyTabEntry &b)
-{
-    return a.xkbkey == b.xkbkey;
-}
-
-static const KeyTabEntry keyTab[] = {
-    { XKB_KEY_Escape,             Qt::Key_Escape },
-    { XKB_KEY_Tab,                Qt::Key_Tab },
-    { XKB_KEY_ISO_Left_Tab,       Qt::Key_Backtab },
-    { XKB_KEY_BackSpace,          Qt::Key_Backspace },
-    { XKB_KEY_Return,             Qt::Key_Return },
-    { XKB_KEY_Insert,             Qt::Key_Insert },
-    { XKB_KEY_Delete,             Qt::Key_Delete },
-    { XKB_KEY_Clear,              Qt::Key_Delete },
-    { XKB_KEY_Pause,              Qt::Key_Pause },
-    { XKB_KEY_Print,              Qt::Key_Print },
-
-    { XKB_KEY_Home,               Qt::Key_Home },
-    { XKB_KEY_End,                Qt::Key_End },
-    { XKB_KEY_Left,               Qt::Key_Left },
-    { XKB_KEY_Up,                 Qt::Key_Up },
-    { XKB_KEY_Right,              Qt::Key_Right },
-    { XKB_KEY_Down,               Qt::Key_Down },
-    { XKB_KEY_Prior,              Qt::Key_PageUp },
-    { XKB_KEY_Next,               Qt::Key_PageDown },
-
-    { XKB_KEY_Shift_L,            Qt::Key_Shift },
-    { XKB_KEY_Shift_R,            Qt::Key_Shift },
-    { XKB_KEY_Shift_Lock,         Qt::Key_Shift },
-    { XKB_KEY_Control_L,          Qt::Key_Control },
-    { XKB_KEY_Control_R,          Qt::Key_Control },
-    { XKB_KEY_Meta_L,             Qt::Key_Meta },
-    { XKB_KEY_Meta_R,             Qt::Key_Meta },
-    { XKB_KEY_Alt_L,              Qt::Key_Alt },
-    { XKB_KEY_Alt_R,              Qt::Key_Alt },
-    { XKB_KEY_Caps_Lock,          Qt::Key_CapsLock },
-    { XKB_KEY_Num_Lock,           Qt::Key_NumLock },
-    { XKB_KEY_Scroll_Lock,        Qt::Key_ScrollLock },
-    { XKB_KEY_Super_L,            Qt::Key_Super_L },
-    { XKB_KEY_Super_R,            Qt::Key_Super_R },
-    { XKB_KEY_Menu,               Qt::Key_Menu },
-    { XKB_KEY_Hyper_L,            Qt::Key_Hyper_L },
-    { XKB_KEY_Hyper_R,            Qt::Key_Hyper_R },
-    { XKB_KEY_Help,               Qt::Key_Help },
-
-    { XKB_KEY_KP_Space,           Qt::Key_Space },
-    { XKB_KEY_KP_Tab,             Qt::Key_Tab },
-    { XKB_KEY_KP_Enter,           Qt::Key_Enter },
-    { XKB_KEY_KP_Home,            Qt::Key_Home },
-    { XKB_KEY_KP_Left,            Qt::Key_Left },
-    { XKB_KEY_KP_Up,              Qt::Key_Up },
-    { XKB_KEY_KP_Right,           Qt::Key_Right },
-    { XKB_KEY_KP_Down,            Qt::Key_Down },
-    { XKB_KEY_KP_Prior,           Qt::Key_PageUp },
-    { XKB_KEY_KP_Next,            Qt::Key_PageDown },
-    { XKB_KEY_KP_End,             Qt::Key_End },
-    { XKB_KEY_KP_Begin,           Qt::Key_Clear },
-    { XKB_KEY_KP_Insert,          Qt::Key_Insert },
-    { XKB_KEY_KP_Delete,          Qt::Key_Delete },
-    { XKB_KEY_KP_Equal,           Qt::Key_Equal },
-    { XKB_KEY_KP_Multiply,        Qt::Key_Asterisk },
-    { XKB_KEY_KP_Add,             Qt::Key_Plus },
-    { XKB_KEY_KP_Separator,       Qt::Key_Comma },
-    { XKB_KEY_KP_Subtract,        Qt::Key_Minus },
-    { XKB_KEY_KP_Decimal,         Qt::Key_Period },
-    { XKB_KEY_KP_Divide,          Qt::Key_Slash },
-};
-#endif
-
 QLibInputKeyboard::QLibInputKeyboard()
-#ifndef QT_NO_XKBCOMMON_EVDEV
-    : m_ctx(0),
-      m_keymap(0),
-      m_state(0),
-      m_mods(Qt::NoModifier)
-#endif
 {
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
     qCDebug(qLcLibInput) << "Using xkbcommon for key mapping";
     m_ctx = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
     if (!m_ctx) {
@@ -148,29 +68,25 @@ QLibInputKeyboard::QLibInputKeyboard()
     }
     m_keymap = xkb_keymap_new_from_names(m_ctx, nullptr, XKB_KEYMAP_COMPILE_NO_FLAGS);
     if (!m_keymap) {
-        qWarning("Failed to compile keymap");
+        qCWarning(qLcLibInput, "Failed to compile keymap");
         return;
     }
     m_state = xkb_state_new(m_keymap);
     if (!m_state) {
-        qWarning("Failed to create xkb state");
+        qCWarning(qLcLibInput, "Failed to create xkb state");
         return;
     }
-    m_modindex[0] = xkb_keymap_mod_get_index(m_keymap, XKB_MOD_NAME_CTRL);
-    m_modindex[1] = xkb_keymap_mod_get_index(m_keymap, XKB_MOD_NAME_ALT);
-    m_modindex[2] = xkb_keymap_mod_get_index(m_keymap, XKB_MOD_NAME_SHIFT);
-    m_modindex[3] = xkb_keymap_mod_get_index(m_keymap, XKB_MOD_NAME_LOGO);
 
     m_repeatTimer.setSingleShot(true);
     connect(&m_repeatTimer, &QTimer::timeout, this, &QLibInputKeyboard::handleRepeat);
 #else
-    qCWarning(qLcLibInput) << "X-less xkbcommon not available, not performing key mapping";
+    qCWarning(qLcLibInput) << "xkbcommon not available, not performing key mapping";
 #endif
 }
 
 QLibInputKeyboard::~QLibInputKeyboard()
 {
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
     if (m_state)
         xkb_state_unref(m_state);
     if (m_keymap)
@@ -182,56 +98,37 @@ QLibInputKeyboard::~QLibInputKeyboard()
 
 void QLibInputKeyboard::processKey(libinput_event_keyboard *e)
 {
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
     if (!m_ctx || !m_keymap || !m_state)
         return;
 
-    const uint32_t k = libinput_event_keyboard_get_key(e) + 8;
+    const uint32_t keycode = libinput_event_keyboard_get_key(e) + 8;
+    const xkb_keysym_t sym = xkb_state_key_get_one_sym(m_state, keycode);
     const bool pressed = libinput_event_keyboard_get_key_state(e) == LIBINPUT_KEY_STATE_PRESSED;
 
-    QVarLengthArray<char, 32> chars(32);
-    const int size = xkb_state_key_get_utf8(m_state, k, chars.data(), chars.size());
-    if (Q_UNLIKELY(size + 1 > chars.size())) { // +1 for NUL
-        chars.resize(size + 1);
-        xkb_state_key_get_utf8(m_state, k, chars.data(), chars.size());
-    }
-    const QString text = QString::fromUtf8(chars.constData(), size);
-
-    const xkb_keysym_t sym = xkb_state_key_get_one_sym(m_state, k);
+    // Modifiers here is the modifier state before the event, i.e. not
+    // including the current key in case it is a modifier. See the XOR
+    // logic in QKeyEvent::modifiers(). ### QTBUG-73826
+    Qt::KeyboardModifiers modifiers = QXkbCommon::modifiers(m_state);
 
-    // mods here is the modifier state before the event, i.e. not
-    // including the current key in case it is a modifier.
-    Qt::KeyboardModifiers mods = Qt::NoModifier;
-    const int qtkey = keysymToQtKey(sym, &mods, text);
+    const QString text = QXkbCommon::lookupString(m_state, keycode);
+    const int qtkey = QXkbCommon::keysymToQtKey(sym, modifiers, m_state, keycode);
 
-    if (qtkey == Qt::Key_Control)
-        mods |= Qt::ControlModifier;
-    if (qtkey == Qt::Key_Alt)
-        mods |= Qt::AltModifier;
-    if (qtkey == Qt::Key_Shift)
-        mods |= Qt::ShiftModifier;
-    if (qtkey == Qt::Key_Meta)
-        mods |= Qt::MetaModifier;
-    xkb_state_update_key(m_state, k, pressed ? XKB_KEY_DOWN : XKB_KEY_UP);
+    xkb_state_update_key(m_state, keycode, pressed ? XKB_KEY_DOWN : XKB_KEY_UP);
 
-    if (mods != Qt::NoModifier) {
-        if (pressed)
-            m_mods |= mods;
-        else
-            m_mods &= ~mods;
+    Qt::KeyboardModifiers modifiersAfterStateChange = QXkbCommon::modifiers(m_state);
+    QGuiApplicationPrivate::inputDeviceManager()->setKeyboardModifiers(modifiersAfterStateChange);
 
-        QGuiApplicationPrivate::inputDeviceManager()->setKeyboardModifiers(m_mods);
-    }
     QWindowSystemInterface::handleExtendedKeyEvent(nullptr,
                                                    pressed ? QEvent::KeyPress : QEvent::KeyRelease,
-                                                   qtkey, m_mods, k, sym, m_mods, text);
+                                                   qtkey, modifiers, keycode, sym, modifiers, text);
 
-    if (pressed && xkb_keymap_key_repeats(m_keymap, k)) {
+    if (pressed && xkb_keymap_key_repeats(m_keymap, keycode)) {
         m_repeatData.qtkey = qtkey;
-        m_repeatData.mods = mods;
-        m_repeatData.nativeScanCode = k;
+        m_repeatData.mods = modifiers;
+        m_repeatData.nativeScanCode = keycode;
         m_repeatData.virtualKey = sym;
-        m_repeatData.nativeMods = mods;
+        m_repeatData.nativeMods = modifiers;
         m_repeatData.unicodeText = text;
         m_repeatData.repeatCount = 1;
         m_repeatTimer.setInterval(REPEAT_DELAY);
@@ -245,7 +142,7 @@ void QLibInputKeyboard::processKey(libinput_event_keyboard *e)
 #endif
 }
 
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
 void QLibInputKeyboard::handleRepeat()
 {
     QWindowSystemInterface::handleExtendedKeyEvent(nullptr, QEvent::KeyPress,
@@ -256,50 +153,6 @@ void QLibInputKeyboard::handleRepeat()
     m_repeatTimer.setInterval(REPEAT_RATE);
     m_repeatTimer.start();
 }
-
-int QLibInputKeyboard::keysymToQtKey(xkb_keysym_t key) const
-{
-    const size_t elemCount = sizeof(keyTab) / sizeof(KeyTabEntry);
-    KeyTabEntry e;
-    e.xkbkey = key;
-    const KeyTabEntry *result = std::find(keyTab, keyTab + elemCount, e);
-    return result != keyTab + elemCount ? result->qtkey : 0;
-}
-
-int QLibInputKeyboard::keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers *modifiers, const QString &text) const
-{
-    int code = 0;
-#ifndef QT_NO_TEXTCODEC
-    QTextCodec *systemCodec = QTextCodec::codecForLocale();
-#endif
-    if (keysym < 128 || (keysym < 256
-#ifndef QT_NO_TEXTCODEC
-                         && systemCodec->mibEnum() == 4
-#endif
-                         )) {
-        // upper-case key, if known
-        code = isprint((int)keysym) ? toupper((int)keysym) : 0;
-    } else if (keysym >= XKB_KEY_F1 && keysym <= XKB_KEY_F35) {
-        // function keys
-        code = Qt::Key_F1 + ((int)keysym - XKB_KEY_F1);
-    } else if (keysym >= XKB_KEY_KP_Space && keysym <= XKB_KEY_KP_9) {
-        if (keysym >= XKB_KEY_KP_0) {
-            // numeric keypad keys
-            code = Qt::Key_0 + ((int)keysym - XKB_KEY_KP_0);
-        } else {
-            code = keysymToQtKey(keysym);
-        }
-        *modifiers |= Qt::KeypadModifier;
-    } else if (text.length() == 1 && text.unicode()->unicode() > 0x1f
-                                  && text.unicode()->unicode() != 0x7f
-                                  && !(keysym >= XKB_KEY_dead_grave && keysym <= XKB_KEY_dead_longsolidusoverlay)) {
-        code = text.unicode()->toUpper().unicode();
-    } else {
-        // any other keys
-        code = keysymToQtKey(keysym);
-    }
-    return code;
-}
 #endif
 
 QT_END_NAMESPACE
diff --git a/src/platformsupport/input/libinput/qlibinputkeyboard_p.h b/src/platformsupport/input/libinput/qlibinputkeyboard_p.h
index 9e09bccd79..7521902e02 100644
--- a/src/platformsupport/input/libinput/qlibinputkeyboard_p.h
+++ b/src/platformsupport/input/libinput/qlibinputkeyboard_p.h
@@ -43,7 +43,9 @@
 #include <QtCore/QPoint>
 #include <QtCore/QTimer>
 
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#include <QtGui/private/qtguiglobal_p.h>
+
+#if QT_CONFIG(xkbcommon)
 #include <xkbcommon/xkbcommon.h>
 #endif
 
@@ -70,17 +72,16 @@ public:
 
     void processKey(libinput_event_keyboard *e);
 
-#ifndef QT_NO_XKBCOMMON_EVDEV
+#if QT_CONFIG(xkbcommon)
     void handleRepeat();
 
 private:
     int keysymToQtKey(xkb_keysym_t key) const;
     int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers *modifiers, const QString &text) const;
 
-    xkb_context *m_ctx;
-    xkb_keymap *m_keymap;
-    xkb_state *m_state;
-    xkb_mod_index_t m_modindex[4];
+    xkb_context *m_ctx = nullptr;
+    xkb_keymap *m_keymap = nullptr;
+    xkb_state *m_state = nullptr;
 
     QTimer m_repeatTimer;
 
@@ -93,7 +94,6 @@ private:
         QString unicodeText;
         int repeatCount;
     } m_repeatData;
-    Qt::KeyboardModifiers m_mods;
 #endif
 };
 
diff --git a/src/platformsupport/input/libinput/qlibinputtouch_p.h b/src/platformsupport/input/libinput/qlibinputtouch_p.h
index 6f88001d19..51304e6a21 100644
--- a/src/platformsupport/input/libinput/qlibinputtouch_p.h
+++ b/src/platformsupport/input/libinput/qlibinputtouch_p.h
@@ -73,7 +73,7 @@ public:
 
 private:
     struct DeviceState {
-        DeviceState() : m_touchDevice(0) { }
+        DeviceState() : m_touchDevice(nullptr) { }
         QWindowSystemInterface::TouchPoint *point(int32_t slot);
         QList<QWindowSystemInterface::TouchPoint> m_points;
         QTouchDevice *m_touchDevice;
diff --git a/src/platformsupport/input/tslib/qtslib.cpp b/src/platformsupport/input/tslib/qtslib.cpp
index 75ac3c50e0..f8fdc151ec 100644
--- a/src/platformsupport/input/tslib/qtslib.cpp
+++ b/src/platformsupport/input/tslib/qtslib.cpp
@@ -57,7 +57,7 @@ QTsLibMouseHandler::QTsLibMouseHandler(const QString &key,
                                        const QString &specification,
                                        QObject *parent)
     : QObject(parent),
-    m_notify(0), m_x(0), m_y(0), m_pressed(0), m_rawMode(false)
+    m_rawMode(!key.compare(QLatin1String("TslibRaw"), Qt::CaseInsensitive))
 {
     qCDebug(qLcTsLib) << "Initializing tslib plugin" << key << specification;
     setObjectName(QLatin1String("TSLib Mouse Handler"));
@@ -79,13 +79,11 @@ QTsLibMouseHandler::QTsLibMouseHandler(const QString &key,
     if (ts_config(m_dev))
         qErrnoWarning(errno, "ts_config() failed");
 
-    m_rawMode = !key.compare(QLatin1String("TslibRaw"), Qt::CaseInsensitive);
-
     int fd = ts_fd(m_dev);
     if (fd >= 0) {
         qCDebug(qLcTsLib) << "tslib device is" << device;
         m_notify = new QSocketNotifier(fd, QSocketNotifier::Read, this);
-        connect(m_notify, SIGNAL(activated(int)), this, SLOT(readMouseData()));
+        connect(m_notify, &QSocketNotifier::activated, this, &QTsLibMouseHandler::readMouseData);
     } else {
         qErrnoWarning(errno, "tslib: Cannot open input device %s", device.constData());
     }
@@ -129,7 +127,9 @@ void QTsLibMouseHandler::readMouseData()
         }
         QPoint pos(x, y);
 
-        QWindowSystemInterface::handleMouseEvent(0, pos, pos, pressed ? Qt::LeftButton : Qt::NoButton);
+        QWindowSystemInterface::handleMouseEvent(nullptr, pos, pos,
+                                                 pressed ? Qt::LeftButton : Qt::NoButton,
+                                                 Qt::NoButton, QEvent::None);
 
         m_x = x;
         m_y = y;
diff --git a/src/platformsupport/input/tslib/qtslib_p.h b/src/platformsupport/input/tslib/qtslib_p.h
index 0c08fb6a3d..ffd60cd0e3 100644
--- a/src/platformsupport/input/tslib/qtslib_p.h
+++ b/src/platformsupport/input/tslib/qtslib_p.h
@@ -71,11 +71,12 @@ private slots:
     void readMouseData();
 
 private:
-    QSocketNotifier * m_notify;
+    QSocketNotifier * m_notify = nullptr;
     tsdev *m_dev;
-    int m_x, m_y;
-    bool m_pressed;
-    bool m_rawMode;
+    int m_x = 0;
+    int m_y = 0;
+    bool m_pressed = false;
+    const bool m_rawMode;
 };
 
 QT_END_NAMESPACE
diff --git a/src/platformsupport/input/xkbcommon/CMakeLists.txt b/src/platformsupport/input/xkbcommon/CMakeLists.txt
new file mode 100644
index 0000000000..2797966fc4
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/CMakeLists.txt
@@ -0,0 +1,35 @@
+# Generated from xkbcommon.pro.
+
+#####################################################################
+## XkbCommonSupport Module:
+#####################################################################
+
+add_qt_module(XkbCommonSupport
+    STATIC
+    SOURCES
+        qxkbcommon.cpp qxkbcommon_p.h
+        qxkbcommon_3rdparty.cpp
+    DEFINES
+        QT_NO_CAST_FROM_ASCII
+    LIBRARIES
+        Qt::CorePrivate
+        Qt::GuiPrivate
+    PUBLIC_LIBRARIES
+        Qt::Core
+        Qt::Gui
+        XKB::XKB
+)
+
+#### Keys ignored in scope 1:.:.:xkbcommon.pro:<TRUE>:
+# CONFIG = "static" "internal_module"
+# MODULE = "xkbcommon_support"
+# PRECOMPILED_HEADER = "../../../corelib/global/qt_pch.h"
+# _LOADED = "qt_module"
+
+## Scopes:
+#####################################################################
+
+extend_target(XkbCommonSupport CONDITION CLANG AND NOT ICC
+    COMPILE_OPTIONS
+        "-ftemplate-depth=1024"
+)
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
new file mode 100644
index 0000000000..877c5d848f
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
@@ -0,0 +1,828 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qxkbcommon_p.h"
+
+#include <private/qmakearray_p.h>
+
+#include <QtCore/QMetaMethod>
+#include <QtGui/QKeyEvent>
+#include <QtGui/private/qguiapplication_p.h>
+
+#include <qpa/qplatforminputcontext.h>
+#include <qpa/qplatformintegration.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(lcXkbcommon, "qt.xkbcommon")
+
+static int keysymToQtKey_internal(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                                  xkb_state *state, xkb_keycode_t code,
+                                  bool superAsMeta, bool hyperAsMeta);
+
+typedef struct xkb2qt
+{
+    unsigned int xkb;
+    unsigned int qt;
+
+    constexpr bool operator <=(const xkb2qt &that) const noexcept
+    {
+        return xkb <= that.xkb;
+    }
+
+    constexpr bool operator <(const xkb2qt &that) const noexcept
+    {
+        return xkb < that.xkb;
+    }
+} xkb2qt_t;
+
+template<std::size_t Xkb, std::size_t Qt>
+struct Xkb2Qt
+{
+    using Type = xkb2qt_t;
+    static constexpr Type data() noexcept { return Type{Xkb, Qt}; }
+};
+
+static constexpr const auto KeyTbl = qMakeArray(
+    QSortedData<
+        // misc keys
+
+        Xkb2Qt<XKB_KEY_Escape,                  Qt::Key_Escape>,
+        Xkb2Qt<XKB_KEY_Tab,                     Qt::Key_Tab>,
+        Xkb2Qt<XKB_KEY_ISO_Left_Tab,            Qt::Key_Backtab>,
+        Xkb2Qt<XKB_KEY_BackSpace,               Qt::Key_Backspace>,
+        Xkb2Qt<XKB_KEY_Return,                  Qt::Key_Return>,
+        Xkb2Qt<XKB_KEY_Insert,                  Qt::Key_Insert>,
+        Xkb2Qt<XKB_KEY_Delete,                  Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_Clear,                   Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_Pause,                   Qt::Key_Pause>,
+        Xkb2Qt<XKB_KEY_Print,                   Qt::Key_Print>,
+        Xkb2Qt<0x1005FF60,                      Qt::Key_SysReq>,         // hardcoded Sun SysReq
+        Xkb2Qt<0x1007ff00,                      Qt::Key_SysReq>,         // hardcoded X386 SysReq
+
+        // cursor movement
+
+        Xkb2Qt<XKB_KEY_Home,                    Qt::Key_Home>,
+        Xkb2Qt<XKB_KEY_End,                     Qt::Key_End>,
+        Xkb2Qt<XKB_KEY_Left,                    Qt::Key_Left>,
+        Xkb2Qt<XKB_KEY_Up,                      Qt::Key_Up>,
+        Xkb2Qt<XKB_KEY_Right,                   Qt::Key_Right>,
+        Xkb2Qt<XKB_KEY_Down,                    Qt::Key_Down>,
+        Xkb2Qt<XKB_KEY_Prior,                   Qt::Key_PageUp>,
+        Xkb2Qt<XKB_KEY_Next,                    Qt::Key_PageDown>,
+
+        // modifiers
+
+        Xkb2Qt<XKB_KEY_Shift_L,                 Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Shift_R,                 Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Shift_Lock,              Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Control_L,               Qt::Key_Control>,
+        Xkb2Qt<XKB_KEY_Control_R,               Qt::Key_Control>,
+        Xkb2Qt<XKB_KEY_Meta_L,                  Qt::Key_Meta>,
+        Xkb2Qt<XKB_KEY_Meta_R,                  Qt::Key_Meta>,
+        Xkb2Qt<XKB_KEY_Alt_L,                   Qt::Key_Alt>,
+        Xkb2Qt<XKB_KEY_Alt_R,                   Qt::Key_Alt>,
+        Xkb2Qt<XKB_KEY_Caps_Lock,               Qt::Key_CapsLock>,
+        Xkb2Qt<XKB_KEY_Num_Lock,                Qt::Key_NumLock>,
+        Xkb2Qt<XKB_KEY_Scroll_Lock,             Qt::Key_ScrollLock>,
+        Xkb2Qt<XKB_KEY_Super_L,                 Qt::Key_Super_L>,
+        Xkb2Qt<XKB_KEY_Super_R,                 Qt::Key_Super_R>,
+        Xkb2Qt<XKB_KEY_Menu,                    Qt::Key_Menu>,
+        Xkb2Qt<XKB_KEY_Hyper_L,                 Qt::Key_Hyper_L>,
+        Xkb2Qt<XKB_KEY_Hyper_R,                 Qt::Key_Hyper_R>,
+        Xkb2Qt<XKB_KEY_Help,                    Qt::Key_Help>,
+        Xkb2Qt<0x1000FF74,                      Qt::Key_Backtab>,        // hardcoded HP backtab
+        Xkb2Qt<0x1005FF10,                      Qt::Key_F11>,            // hardcoded Sun F36 (labeled F11)
+        Xkb2Qt<0x1005FF11,                      Qt::Key_F12>,            // hardcoded Sun F37 (labeled F12)
+
+        // numeric and function keypad keys
+
+        Xkb2Qt<XKB_KEY_KP_Space,                Qt::Key_Space>,
+        Xkb2Qt<XKB_KEY_KP_Tab,                  Qt::Key_Tab>,
+        Xkb2Qt<XKB_KEY_KP_Enter,                Qt::Key_Enter>,
+        Xkb2Qt<XKB_KEY_KP_Home,                 Qt::Key_Home>,
+        Xkb2Qt<XKB_KEY_KP_Left,                 Qt::Key_Left>,
+        Xkb2Qt<XKB_KEY_KP_Up,                   Qt::Key_Up>,
+        Xkb2Qt<XKB_KEY_KP_Right,                Qt::Key_Right>,
+        Xkb2Qt<XKB_KEY_KP_Down,                 Qt::Key_Down>,
+        Xkb2Qt<XKB_KEY_KP_Prior,                Qt::Key_PageUp>,
+        Xkb2Qt<XKB_KEY_KP_Next,                 Qt::Key_PageDown>,
+        Xkb2Qt<XKB_KEY_KP_End,                  Qt::Key_End>,
+        Xkb2Qt<XKB_KEY_KP_Begin,                Qt::Key_Clear>,
+        Xkb2Qt<XKB_KEY_KP_Insert,               Qt::Key_Insert>,
+        Xkb2Qt<XKB_KEY_KP_Delete,               Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_KP_Equal,                Qt::Key_Equal>,
+        Xkb2Qt<XKB_KEY_KP_Multiply,             Qt::Key_Asterisk>,
+        Xkb2Qt<XKB_KEY_KP_Add,                  Qt::Key_Plus>,
+        Xkb2Qt<XKB_KEY_KP_Separator,            Qt::Key_Comma>,
+        Xkb2Qt<XKB_KEY_KP_Subtract,             Qt::Key_Minus>,
+        Xkb2Qt<XKB_KEY_KP_Decimal,              Qt::Key_Period>,
+        Xkb2Qt<XKB_KEY_KP_Divide,               Qt::Key_Slash>,
+
+        // special non-XF86 function keys
+
+        Xkb2Qt<XKB_KEY_Undo,                    Qt::Key_Undo>,
+        Xkb2Qt<XKB_KEY_Redo,                    Qt::Key_Redo>,
+        Xkb2Qt<XKB_KEY_Find,                    Qt::Key_Find>,
+        Xkb2Qt<XKB_KEY_Cancel,                  Qt::Key_Cancel>,
+
+        // International input method support keys
+
+        // International & multi-key character composition
+        Xkb2Qt<XKB_KEY_ISO_Level3_Shift,        Qt::Key_AltGr>,
+        Xkb2Qt<XKB_KEY_Multi_key,               Qt::Key_Multi_key>,
+        Xkb2Qt<XKB_KEY_Codeinput,               Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_SingleCandidate,         Qt::Key_SingleCandidate>,
+        Xkb2Qt<XKB_KEY_MultipleCandidate,       Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_PreviousCandidate,       Qt::Key_PreviousCandidate>,
+
+        // Misc Functions
+        Xkb2Qt<XKB_KEY_Mode_switch,             Qt::Key_Mode_switch>,
+        Xkb2Qt<XKB_KEY_script_switch,           Qt::Key_Mode_switch>,
+
+        // Japanese keyboard support
+        Xkb2Qt<XKB_KEY_Kanji,                   Qt::Key_Kanji>,
+        Xkb2Qt<XKB_KEY_Muhenkan,                Qt::Key_Muhenkan>,
+        //Xkb2Qt<XKB_KEY_Henkan_Mode,           Qt::Key_Henkan_Mode>,
+        Xkb2Qt<XKB_KEY_Henkan_Mode,             Qt::Key_Henkan>,
+        Xkb2Qt<XKB_KEY_Henkan,                  Qt::Key_Henkan>,
+        Xkb2Qt<XKB_KEY_Romaji,                  Qt::Key_Romaji>,
+        Xkb2Qt<XKB_KEY_Hiragana,                Qt::Key_Hiragana>,
+        Xkb2Qt<XKB_KEY_Katakana,                Qt::Key_Katakana>,
+        Xkb2Qt<XKB_KEY_Hiragana_Katakana,       Qt::Key_Hiragana_Katakana>,
+        Xkb2Qt<XKB_KEY_Zenkaku,                 Qt::Key_Zenkaku>,
+        Xkb2Qt<XKB_KEY_Hankaku,                 Qt::Key_Hankaku>,
+        Xkb2Qt<XKB_KEY_Zenkaku_Hankaku,         Qt::Key_Zenkaku_Hankaku>,
+        Xkb2Qt<XKB_KEY_Touroku,                 Qt::Key_Touroku>,
+        Xkb2Qt<XKB_KEY_Massyo,                  Qt::Key_Massyo>,
+        Xkb2Qt<XKB_KEY_Kana_Lock,               Qt::Key_Kana_Lock>,
+        Xkb2Qt<XKB_KEY_Kana_Shift,              Qt::Key_Kana_Shift>,
+        Xkb2Qt<XKB_KEY_Eisu_Shift,              Qt::Key_Eisu_Shift>,
+        Xkb2Qt<XKB_KEY_Eisu_toggle,             Qt::Key_Eisu_toggle>,
+        //Xkb2Qt<XKB_KEY_Kanji_Bangou,          Qt::Key_Kanji_Bangou>,
+        //Xkb2Qt<XKB_KEY_Zen_Koho,              Qt::Key_Zen_Koho>,
+        //Xkb2Qt<XKB_KEY_Mae_Koho,              Qt::Key_Mae_Koho>,
+        Xkb2Qt<XKB_KEY_Kanji_Bangou,            Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_Zen_Koho,                Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_Mae_Koho,                Qt::Key_PreviousCandidate>,
+
+        // Korean keyboard support
+        Xkb2Qt<XKB_KEY_Hangul,                  Qt::Key_Hangul>,
+        Xkb2Qt<XKB_KEY_Hangul_Start,            Qt::Key_Hangul_Start>,
+        Xkb2Qt<XKB_KEY_Hangul_End,              Qt::Key_Hangul_End>,
+        Xkb2Qt<XKB_KEY_Hangul_Hanja,            Qt::Key_Hangul_Hanja>,
+        Xkb2Qt<XKB_KEY_Hangul_Jamo,             Qt::Key_Hangul_Jamo>,
+        Xkb2Qt<XKB_KEY_Hangul_Romaja,           Qt::Key_Hangul_Romaja>,
+        //Xkb2Qt<XKB_KEY_Hangul_Codeinput,      Qt::Key_Hangul_Codeinput>,
+        Xkb2Qt<XKB_KEY_Hangul_Codeinput,        Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_Hangul_Jeonja,           Qt::Key_Hangul_Jeonja>,
+        Xkb2Qt<XKB_KEY_Hangul_Banja,            Qt::Key_Hangul_Banja>,
+        Xkb2Qt<XKB_KEY_Hangul_PreHanja,         Qt::Key_Hangul_PreHanja>,
+        Xkb2Qt<XKB_KEY_Hangul_PostHanja,        Qt::Key_Hangul_PostHanja>,
+        //Xkb2Qt<XKB_KEY_Hangul_SingleCandidate,Qt::Key_Hangul_SingleCandidate>,
+        //Xkb2Qt<XKB_KEY_Hangul_MultipleCandidate,Qt::Key_Hangul_MultipleCandidate>,
+        //Xkb2Qt<XKB_KEY_Hangul_PreviousCandidate,Qt::Key_Hangul_PreviousCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_SingleCandidate,  Qt::Key_SingleCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_MultipleCandidate,Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_PreviousCandidate,Qt::Key_PreviousCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_Special,          Qt::Key_Hangul_Special>,
+        //Xkb2Qt<XKB_KEY_Hangul_switch,         Qt::Key_Hangul_switch>,
+        Xkb2Qt<XKB_KEY_Hangul_switch,           Qt::Key_Mode_switch>,
+
+        // dead keys
+        Xkb2Qt<XKB_KEY_dead_grave,              Qt::Key_Dead_Grave>,
+        Xkb2Qt<XKB_KEY_dead_acute,              Qt::Key_Dead_Acute>,
+        Xkb2Qt<XKB_KEY_dead_circumflex,         Qt::Key_Dead_Circumflex>,
+        Xkb2Qt<XKB_KEY_dead_tilde,              Qt::Key_Dead_Tilde>,
+        Xkb2Qt<XKB_KEY_dead_macron,             Qt::Key_Dead_Macron>,
+        Xkb2Qt<XKB_KEY_dead_breve,              Qt::Key_Dead_Breve>,
+        Xkb2Qt<XKB_KEY_dead_abovedot,           Qt::Key_Dead_Abovedot>,
+        Xkb2Qt<XKB_KEY_dead_diaeresis,          Qt::Key_Dead_Diaeresis>,
+        Xkb2Qt<XKB_KEY_dead_abovering,          Qt::Key_Dead_Abovering>,
+        Xkb2Qt<XKB_KEY_dead_doubleacute,        Qt::Key_Dead_Doubleacute>,
+        Xkb2Qt<XKB_KEY_dead_caron,              Qt::Key_Dead_Caron>,
+        Xkb2Qt<XKB_KEY_dead_cedilla,            Qt::Key_Dead_Cedilla>,
+        Xkb2Qt<XKB_KEY_dead_ogonek,             Qt::Key_Dead_Ogonek>,
+        Xkb2Qt<XKB_KEY_dead_iota,               Qt::Key_Dead_Iota>,
+        Xkb2Qt<XKB_KEY_dead_voiced_sound,       Qt::Key_Dead_Voiced_Sound>,
+        Xkb2Qt<XKB_KEY_dead_semivoiced_sound,   Qt::Key_Dead_Semivoiced_Sound>,
+        Xkb2Qt<XKB_KEY_dead_belowdot,           Qt::Key_Dead_Belowdot>,
+        Xkb2Qt<XKB_KEY_dead_hook,               Qt::Key_Dead_Hook>,
+        Xkb2Qt<XKB_KEY_dead_horn,               Qt::Key_Dead_Horn>,
+        Xkb2Qt<XKB_KEY_dead_stroke,             Qt::Key_Dead_Stroke>,
+        Xkb2Qt<XKB_KEY_dead_abovecomma,         Qt::Key_Dead_Abovecomma>,
+        Xkb2Qt<XKB_KEY_dead_abovereversedcomma, Qt::Key_Dead_Abovereversedcomma>,
+        Xkb2Qt<XKB_KEY_dead_doublegrave,        Qt::Key_Dead_Doublegrave>,
+        Xkb2Qt<XKB_KEY_dead_belowring,          Qt::Key_Dead_Belowring>,
+        Xkb2Qt<XKB_KEY_dead_belowmacron,        Qt::Key_Dead_Belowmacron>,
+        Xkb2Qt<XKB_KEY_dead_belowcircumflex,    Qt::Key_Dead_Belowcircumflex>,
+        Xkb2Qt<XKB_KEY_dead_belowtilde,         Qt::Key_Dead_Belowtilde>,
+        Xkb2Qt<XKB_KEY_dead_belowbreve,         Qt::Key_Dead_Belowbreve>,
+        Xkb2Qt<XKB_KEY_dead_belowdiaeresis,     Qt::Key_Dead_Belowdiaeresis>,
+        Xkb2Qt<XKB_KEY_dead_invertedbreve,      Qt::Key_Dead_Invertedbreve>,
+        Xkb2Qt<XKB_KEY_dead_belowcomma,         Qt::Key_Dead_Belowcomma>,
+        Xkb2Qt<XKB_KEY_dead_currency,           Qt::Key_Dead_Currency>,
+        Xkb2Qt<XKB_KEY_dead_a,                  Qt::Key_Dead_a>,
+        Xkb2Qt<XKB_KEY_dead_A,                  Qt::Key_Dead_A>,
+        Xkb2Qt<XKB_KEY_dead_e,                  Qt::Key_Dead_e>,
+        Xkb2Qt<XKB_KEY_dead_E,                  Qt::Key_Dead_E>,
+        Xkb2Qt<XKB_KEY_dead_i,                  Qt::Key_Dead_i>,
+        Xkb2Qt<XKB_KEY_dead_I,                  Qt::Key_Dead_I>,
+        Xkb2Qt<XKB_KEY_dead_o,                  Qt::Key_Dead_o>,
+        Xkb2Qt<XKB_KEY_dead_O,                  Qt::Key_Dead_O>,
+        Xkb2Qt<XKB_KEY_dead_u,                  Qt::Key_Dead_u>,
+        Xkb2Qt<XKB_KEY_dead_U,                  Qt::Key_Dead_U>,
+        Xkb2Qt<XKB_KEY_dead_small_schwa,        Qt::Key_Dead_Small_Schwa>,
+        Xkb2Qt<XKB_KEY_dead_capital_schwa,      Qt::Key_Dead_Capital_Schwa>,
+        Xkb2Qt<XKB_KEY_dead_greek,              Qt::Key_Dead_Greek>,
+        Xkb2Qt<XKB_KEY_dead_lowline,            Qt::Key_Dead_Lowline>,
+        Xkb2Qt<XKB_KEY_dead_aboveverticalline,  Qt::Key_Dead_Aboveverticalline>,
+        Xkb2Qt<XKB_KEY_dead_belowverticalline,  Qt::Key_Dead_Belowverticalline>,
+        Xkb2Qt<XKB_KEY_dead_longsolidusoverlay, Qt::Key_Dead_Longsolidusoverlay>,
+
+        // Special keys from X.org - This include multimedia keys,
+        // wireless/bluetooth/uwb keys, special launcher keys, etc.
+        Xkb2Qt<XKB_KEY_XF86Back,                Qt::Key_Back>,
+        Xkb2Qt<XKB_KEY_XF86Forward,             Qt::Key_Forward>,
+        Xkb2Qt<XKB_KEY_XF86Stop,                Qt::Key_Stop>,
+        Xkb2Qt<XKB_KEY_XF86Refresh,             Qt::Key_Refresh>,
+        Xkb2Qt<XKB_KEY_XF86Favorites,           Qt::Key_Favorites>,
+        Xkb2Qt<XKB_KEY_XF86AudioMedia,          Qt::Key_LaunchMedia>,
+        Xkb2Qt<XKB_KEY_XF86OpenURL,             Qt::Key_OpenUrl>,
+        Xkb2Qt<XKB_KEY_XF86HomePage,            Qt::Key_HomePage>,
+        Xkb2Qt<XKB_KEY_XF86Search,              Qt::Key_Search>,
+        Xkb2Qt<XKB_KEY_XF86AudioLowerVolume,    Qt::Key_VolumeDown>,
+        Xkb2Qt<XKB_KEY_XF86AudioMute,           Qt::Key_VolumeMute>,
+        Xkb2Qt<XKB_KEY_XF86AudioRaiseVolume,    Qt::Key_VolumeUp>,
+        Xkb2Qt<XKB_KEY_XF86AudioPlay,           Qt::Key_MediaPlay>,
+        Xkb2Qt<XKB_KEY_XF86AudioStop,           Qt::Key_MediaStop>,
+        Xkb2Qt<XKB_KEY_XF86AudioPrev,           Qt::Key_MediaPrevious>,
+        Xkb2Qt<XKB_KEY_XF86AudioNext,           Qt::Key_MediaNext>,
+        Xkb2Qt<XKB_KEY_XF86AudioRecord,         Qt::Key_MediaRecord>,
+        Xkb2Qt<XKB_KEY_XF86AudioPause,          Qt::Key_MediaPause>,
+        Xkb2Qt<XKB_KEY_XF86Mail,                Qt::Key_LaunchMail>,
+        Xkb2Qt<XKB_KEY_XF86MyComputer,          Qt::Key_Launch0>,  // ### Qt 6: remap properly
+        Xkb2Qt<XKB_KEY_XF86Calculator,          Qt::Key_Launch1>,
+        Xkb2Qt<XKB_KEY_XF86Memo,                Qt::Key_Memo>,
+        Xkb2Qt<XKB_KEY_XF86ToDoList,            Qt::Key_ToDoList>,
+        Xkb2Qt<XKB_KEY_XF86Calendar,            Qt::Key_Calendar>,
+        Xkb2Qt<XKB_KEY_XF86PowerDown,           Qt::Key_PowerDown>,
+        Xkb2Qt<XKB_KEY_XF86ContrastAdjust,      Qt::Key_ContrastAdjust>,
+        Xkb2Qt<XKB_KEY_XF86Standby,             Qt::Key_Standby>,
+        Xkb2Qt<XKB_KEY_XF86MonBrightnessUp,     Qt::Key_MonBrightnessUp>,
+        Xkb2Qt<XKB_KEY_XF86MonBrightnessDown,   Qt::Key_MonBrightnessDown>,
+        Xkb2Qt<XKB_KEY_XF86KbdLightOnOff,       Qt::Key_KeyboardLightOnOff>,
+        Xkb2Qt<XKB_KEY_XF86KbdBrightnessUp,     Qt::Key_KeyboardBrightnessUp>,
+        Xkb2Qt<XKB_KEY_XF86KbdBrightnessDown,   Qt::Key_KeyboardBrightnessDown>,
+        Xkb2Qt<XKB_KEY_XF86PowerOff,            Qt::Key_PowerOff>,
+        Xkb2Qt<XKB_KEY_XF86WakeUp,              Qt::Key_WakeUp>,
+        Xkb2Qt<XKB_KEY_XF86Eject,               Qt::Key_Eject>,
+        Xkb2Qt<XKB_KEY_XF86ScreenSaver,         Qt::Key_ScreenSaver>,
+        Xkb2Qt<XKB_KEY_XF86WWW,                 Qt::Key_WWW>,
+        Xkb2Qt<XKB_KEY_XF86Sleep,               Qt::Key_Sleep>,
+        Xkb2Qt<XKB_KEY_XF86LightBulb,           Qt::Key_LightBulb>,
+        Xkb2Qt<XKB_KEY_XF86Shop,                Qt::Key_Shop>,
+        Xkb2Qt<XKB_KEY_XF86History,             Qt::Key_History>,
+        Xkb2Qt<XKB_KEY_XF86AddFavorite,         Qt::Key_AddFavorite>,
+        Xkb2Qt<XKB_KEY_XF86HotLinks,            Qt::Key_HotLinks>,
+        Xkb2Qt<XKB_KEY_XF86BrightnessAdjust,    Qt::Key_BrightnessAdjust>,
+        Xkb2Qt<XKB_KEY_XF86Finance,             Qt::Key_Finance>,
+        Xkb2Qt<XKB_KEY_XF86Community,           Qt::Key_Community>,
+        Xkb2Qt<XKB_KEY_XF86AudioRewind,         Qt::Key_AudioRewind>,
+        Xkb2Qt<XKB_KEY_XF86BackForward,         Qt::Key_BackForward>,
+        Xkb2Qt<XKB_KEY_XF86ApplicationLeft,     Qt::Key_ApplicationLeft>,
+        Xkb2Qt<XKB_KEY_XF86ApplicationRight,    Qt::Key_ApplicationRight>,
+        Xkb2Qt<XKB_KEY_XF86Book,                Qt::Key_Book>,
+        Xkb2Qt<XKB_KEY_XF86CD,                  Qt::Key_CD>,
+        Xkb2Qt<XKB_KEY_XF86Calculater,          Qt::Key_Calculator>,
+        Xkb2Qt<XKB_KEY_XF86Clear,               Qt::Key_Clear>,
+        Xkb2Qt<XKB_KEY_XF86ClearGrab,           Qt::Key_ClearGrab>,
+        Xkb2Qt<XKB_KEY_XF86Close,               Qt::Key_Close>,
+        Xkb2Qt<XKB_KEY_XF86Copy,                Qt::Key_Copy>,
+        Xkb2Qt<XKB_KEY_XF86Cut,                 Qt::Key_Cut>,
+        Xkb2Qt<XKB_KEY_XF86Display,             Qt::Key_Display>,
+        Xkb2Qt<XKB_KEY_XF86DOS,                 Qt::Key_DOS>,
+        Xkb2Qt<XKB_KEY_XF86Documents,           Qt::Key_Documents>,
+        Xkb2Qt<XKB_KEY_XF86Excel,               Qt::Key_Excel>,
+        Xkb2Qt<XKB_KEY_XF86Explorer,            Qt::Key_Explorer>,
+        Xkb2Qt<XKB_KEY_XF86Game,                Qt::Key_Game>,
+        Xkb2Qt<XKB_KEY_XF86Go,                  Qt::Key_Go>,
+        Xkb2Qt<XKB_KEY_XF86iTouch,              Qt::Key_iTouch>,
+        Xkb2Qt<XKB_KEY_XF86LogOff,              Qt::Key_LogOff>,
+        Xkb2Qt<XKB_KEY_XF86Market,              Qt::Key_Market>,
+        Xkb2Qt<XKB_KEY_XF86Meeting,             Qt::Key_Meeting>,
+        Xkb2Qt<XKB_KEY_XF86MenuKB,              Qt::Key_MenuKB>,
+        Xkb2Qt<XKB_KEY_XF86MenuPB,              Qt::Key_MenuPB>,
+        Xkb2Qt<XKB_KEY_XF86MySites,             Qt::Key_MySites>,
+        Xkb2Qt<XKB_KEY_XF86New,                 Qt::Key_New>,
+        Xkb2Qt<XKB_KEY_XF86News,                Qt::Key_News>,
+        Xkb2Qt<XKB_KEY_XF86OfficeHome,          Qt::Key_OfficeHome>,
+        Xkb2Qt<XKB_KEY_XF86Open,                Qt::Key_Open>,
+        Xkb2Qt<XKB_KEY_XF86Option,              Qt::Key_Option>,
+        Xkb2Qt<XKB_KEY_XF86Paste,               Qt::Key_Paste>,
+        Xkb2Qt<XKB_KEY_XF86Phone,               Qt::Key_Phone>,
+        Xkb2Qt<XKB_KEY_XF86Reply,               Qt::Key_Reply>,
+        Xkb2Qt<XKB_KEY_XF86Reload,              Qt::Key_Reload>,
+        Xkb2Qt<XKB_KEY_XF86RotateWindows,       Qt::Key_RotateWindows>,
+        Xkb2Qt<XKB_KEY_XF86RotationPB,          Qt::Key_RotationPB>,
+        Xkb2Qt<XKB_KEY_XF86RotationKB,          Qt::Key_RotationKB>,
+        Xkb2Qt<XKB_KEY_XF86Save,                Qt::Key_Save>,
+        Xkb2Qt<XKB_KEY_XF86Send,                Qt::Key_Send>,
+        Xkb2Qt<XKB_KEY_XF86Spell,               Qt::Key_Spell>,
+        Xkb2Qt<XKB_KEY_XF86SplitScreen,         Qt::Key_SplitScreen>,
+        Xkb2Qt<XKB_KEY_XF86Support,             Qt::Key_Support>,
+        Xkb2Qt<XKB_KEY_XF86TaskPane,            Qt::Key_TaskPane>,
+        Xkb2Qt<XKB_KEY_XF86Terminal,            Qt::Key_Terminal>,
+        Xkb2Qt<XKB_KEY_XF86Tools,               Qt::Key_Tools>,
+        Xkb2Qt<XKB_KEY_XF86Travel,              Qt::Key_Travel>,
+        Xkb2Qt<XKB_KEY_XF86Video,               Qt::Key_Video>,
+        Xkb2Qt<XKB_KEY_XF86Word,                Qt::Key_Word>,
+        Xkb2Qt<XKB_KEY_XF86Xfer,                Qt::Key_Xfer>,
+        Xkb2Qt<XKB_KEY_XF86ZoomIn,              Qt::Key_ZoomIn>,
+        Xkb2Qt<XKB_KEY_XF86ZoomOut,             Qt::Key_ZoomOut>,
+        Xkb2Qt<XKB_KEY_XF86Away,                Qt::Key_Away>,
+        Xkb2Qt<XKB_KEY_XF86Messenger,           Qt::Key_Messenger>,
+        Xkb2Qt<XKB_KEY_XF86WebCam,              Qt::Key_WebCam>,
+        Xkb2Qt<XKB_KEY_XF86MailForward,         Qt::Key_MailForward>,
+        Xkb2Qt<XKB_KEY_XF86Pictures,            Qt::Key_Pictures>,
+        Xkb2Qt<XKB_KEY_XF86Music,               Qt::Key_Music>,
+        Xkb2Qt<XKB_KEY_XF86Battery,             Qt::Key_Battery>,
+        Xkb2Qt<XKB_KEY_XF86Bluetooth,           Qt::Key_Bluetooth>,
+        Xkb2Qt<XKB_KEY_XF86WLAN,                Qt::Key_WLAN>,
+        Xkb2Qt<XKB_KEY_XF86UWB,                 Qt::Key_UWB>,
+        Xkb2Qt<XKB_KEY_XF86AudioForward,        Qt::Key_AudioForward>,
+        Xkb2Qt<XKB_KEY_XF86AudioRepeat,         Qt::Key_AudioRepeat>,
+        Xkb2Qt<XKB_KEY_XF86AudioRandomPlay,     Qt::Key_AudioRandomPlay>,
+        Xkb2Qt<XKB_KEY_XF86Subtitle,            Qt::Key_Subtitle>,
+        Xkb2Qt<XKB_KEY_XF86AudioCycleTrack,     Qt::Key_AudioCycleTrack>,
+        Xkb2Qt<XKB_KEY_XF86Time,                Qt::Key_Time>,
+        Xkb2Qt<XKB_KEY_XF86Select,              Qt::Key_Select>,
+        Xkb2Qt<XKB_KEY_XF86View,                Qt::Key_View>,
+        Xkb2Qt<XKB_KEY_XF86TopMenu,             Qt::Key_TopMenu>,
+        Xkb2Qt<XKB_KEY_XF86Red,                 Qt::Key_Red>,
+        Xkb2Qt<XKB_KEY_XF86Green,               Qt::Key_Green>,
+        Xkb2Qt<XKB_KEY_XF86Yellow,              Qt::Key_Yellow>,
+        Xkb2Qt<XKB_KEY_XF86Blue,                Qt::Key_Blue>,
+        Xkb2Qt<XKB_KEY_XF86Bluetooth,           Qt::Key_Bluetooth>,
+        Xkb2Qt<XKB_KEY_XF86Suspend,             Qt::Key_Suspend>,
+        Xkb2Qt<XKB_KEY_XF86Hibernate,           Qt::Key_Hibernate>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadToggle,      Qt::Key_TouchpadToggle>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadOn,          Qt::Key_TouchpadOn>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadOff,         Qt::Key_TouchpadOff>,
+        Xkb2Qt<XKB_KEY_XF86AudioMicMute,        Qt::Key_MicMute>,
+        Xkb2Qt<XKB_KEY_XF86Launch0,             Qt::Key_Launch2>, // ### Qt 6: remap properly
+        Xkb2Qt<XKB_KEY_XF86Launch1,             Qt::Key_Launch3>,
+        Xkb2Qt<XKB_KEY_XF86Launch2,             Qt::Key_Launch4>,
+        Xkb2Qt<XKB_KEY_XF86Launch3,             Qt::Key_Launch5>,
+        Xkb2Qt<XKB_KEY_XF86Launch4,             Qt::Key_Launch6>,
+        Xkb2Qt<XKB_KEY_XF86Launch5,             Qt::Key_Launch7>,
+        Xkb2Qt<XKB_KEY_XF86Launch6,             Qt::Key_Launch8>,
+        Xkb2Qt<XKB_KEY_XF86Launch7,             Qt::Key_Launch9>,
+        Xkb2Qt<XKB_KEY_XF86Launch8,             Qt::Key_LaunchA>,
+        Xkb2Qt<XKB_KEY_XF86Launch9,             Qt::Key_LaunchB>,
+        Xkb2Qt<XKB_KEY_XF86LaunchA,             Qt::Key_LaunchC>,
+        Xkb2Qt<XKB_KEY_XF86LaunchB,             Qt::Key_LaunchD>,
+        Xkb2Qt<XKB_KEY_XF86LaunchC,             Qt::Key_LaunchE>,
+        Xkb2Qt<XKB_KEY_XF86LaunchD,             Qt::Key_LaunchF>,
+        Xkb2Qt<XKB_KEY_XF86LaunchE,             Qt::Key_LaunchG>,
+        Xkb2Qt<XKB_KEY_XF86LaunchF,             Qt::Key_LaunchH>
+    >::Data{}
+);
+
+xkb_keysym_t QXkbCommon::qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks)
+{
+    xkb_keysym_t lower, upper;
+
+    xkbcommon_XConvertCase(ks, &lower, &upper);
+
+    return upper;
+}
+
+QString QXkbCommon::lookupString(struct xkb_state *state, xkb_keycode_t code)
+{
+    QVarLengthArray<char, 32> chars(32);
+    const int size = xkb_state_key_get_utf8(state, code, chars.data(), chars.size());
+    if (Q_UNLIKELY(size + 1 > chars.size())) { // +1 for NUL
+        chars.resize(size + 1);
+        xkb_state_key_get_utf8(state, code, chars.data(), chars.size());
+    }
+    return QString::fromUtf8(chars.constData(), size);
+}
+
+QString QXkbCommon::lookupStringNoKeysymTransformations(xkb_keysym_t keysym)
+{
+    QVarLengthArray<char, 32> chars(32);
+    const int size = xkb_keysym_to_utf8(keysym, chars.data(), chars.size());
+    if (size == 0)
+        return QString(); // the keysym does not have a Unicode representation
+
+    if (Q_UNLIKELY(size > chars.size())) {
+        chars.resize(size);
+        xkb_keysym_to_utf8(keysym, chars.data(), chars.size());
+    }
+    return QString::fromUtf8(chars.constData(), size - 1);
+}
+
+QVector<xkb_keysym_t> QXkbCommon::toKeysym(QKeyEvent *event)
+{
+    QVector<xkb_keysym_t> keysyms;
+    int qtKey = event->key();
+
+    if (qtKey >= Qt::Key_F1 && qtKey <= Qt::Key_F35) {
+        keysyms.append(XKB_KEY_F1 + (qtKey - Qt::Key_F1));
+    } else if (event->modifiers() & Qt::KeypadModifier) {
+        if (qtKey >= Qt::Key_0 && qtKey <= Qt::Key_9)
+            keysyms.append(XKB_KEY_KP_0 + (qtKey - Qt::Key_0));
+    } else if (isLatin(qtKey) && event->text().isUpper()) {
+        keysyms.append(qtKey);
+    }
+
+    if (!keysyms.isEmpty())
+        return keysyms;
+
+    // check if we have a direct mapping
+    auto it = std::find_if(KeyTbl.cbegin(), KeyTbl.cend(), [&qtKey](xkb2qt_t elem) {
+        return elem.qt == static_cast<uint>(qtKey);
+    });
+    if (it != KeyTbl.end()) {
+        keysyms.append(it->xkb);
+        return keysyms;
+    }
+
+    QVector<uint> ucs4;
+    if (event->text().isEmpty())
+        ucs4.append(qtKey);
+    else
+        ucs4 = event->text().toUcs4();
+
+    // From libxkbcommon keysym-utf.c:
+    // "We allow to represent any UCS character in the range U-00000000 to
+    // U-00FFFFFF by a keysym value in the range 0x01000000 to 0x01ffffff."
+    for (uint utf32 : qAsConst(ucs4))
+        keysyms.append(utf32 | 0x01000000);
+
+    return keysyms;
+}
+
+int QXkbCommon::keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers)
+{
+    return keysymToQtKey(keysym, modifiers, nullptr, 0);
+}
+
+int QXkbCommon::keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                              xkb_state *state, xkb_keycode_t code,
+                              bool superAsMeta, bool hyperAsMeta)
+{
+    // Note 1: All standard key sequences on linux (as defined in platform theme)
+    // that use a latin character also contain a control modifier, which is why
+    // checking for Qt::ControlModifier is sufficient here. It is possible to
+    // override QPlatformTheme::keyBindings() and provide custom sequences for
+    // QKeySequence::StandardKey. Custom sequences probably should respect this
+    // convention (alternatively, we could test against other modifiers here).
+    // Note 2: The possibleKeys() shorcut mechanism is not affected by this value
+    // adjustment and does its own thing.
+    if (modifiers & Qt::ControlModifier) {
+        // With standard shortcuts we should prefer a latin character, this is
+        // for checks like "some qkeyevent == QKeySequence::Copy" to work even
+        // when using for example 'russian' keyboard layout.
+        if (!QXkbCommon::isLatin(keysym)) {
+            xkb_keysym_t latinKeysym = QXkbCommon::lookupLatinKeysym(state, code);
+            if (latinKeysym != XKB_KEY_NoSymbol)
+                keysym = latinKeysym;
+        }
+    }
+
+    return keysymToQtKey_internal(keysym, modifiers, state, code, superAsMeta, hyperAsMeta);
+}
+
+static int keysymToQtKey_internal(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                                  xkb_state *state, xkb_keycode_t code,
+                                  bool superAsMeta, bool hyperAsMeta)
+{
+    int qtKey = 0;
+
+    // lookup from direct mapping
+    if (keysym >= XKB_KEY_F1 && keysym <= XKB_KEY_F35) {
+        // function keys
+        qtKey = Qt::Key_F1 + (keysym - XKB_KEY_F1);
+    } else if (keysym >= XKB_KEY_KP_0 && keysym <= XKB_KEY_KP_9) {
+        // numeric keypad keys
+        qtKey = Qt::Key_0 + (keysym - XKB_KEY_KP_0);
+    } else if (QXkbCommon::isLatin(keysym)) {
+        qtKey = QXkbCommon::qxkbcommon_xkb_keysym_to_upper(keysym);
+    } else {
+        // check if we have a direct mapping
+        xkb2qt_t searchKey{keysym, 0};
+        auto it = std::lower_bound(KeyTbl.cbegin(), KeyTbl.cend(), searchKey);
+        if (it != KeyTbl.end() && !(searchKey < *it))
+            qtKey = it->qt;
+    }
+
+    if (qtKey)
+        return qtKey;
+
+    // lookup from unicode
+    QString text;
+    if (!state || modifiers & Qt::ControlModifier) {
+        // Control modifier changes the text to ASCII control character, therefore we
+        // can't use this text to map keysym to a qt key. We can use the same keysym
+        // (it is not affectd by transformation) to obtain untransformed text. For details
+        // see "Appendix A. Default Symbol Transformations" in the XKB specification.
+        text = QXkbCommon::lookupStringNoKeysymTransformations(keysym);
+    } else {
+        text = QXkbCommon::lookupString(state, code);
+    }
+    if (!text.isEmpty()) {
+         if (text.unicode()->isDigit()) {
+             // Ensures that also non-latin digits are mapped to corresponding qt keys,
+             // e.g CTRL + ۲ (arabic two), is mapped to CTRL + Qt::Key_2.
+             qtKey = Qt::Key_0 + text.unicode()->digitValue();
+         } else {
+             qtKey = text.unicode()->toUpper().unicode();
+         }
+    }
+
+    // translate Super/Hyper keys to Meta if we're using them as the MetaModifier
+    if (superAsMeta && (qtKey == Qt::Key_Super_L || qtKey == Qt::Key_Super_R))
+        qtKey = Qt::Key_Meta;
+    if (hyperAsMeta && (qtKey == Qt::Key_Hyper_L || qtKey == Qt::Key_Hyper_R))
+        qtKey = Qt::Key_Meta;
+
+    return qtKey;
+}
+
+Qt::KeyboardModifiers QXkbCommon::modifiers(struct xkb_state *state)
+{
+    Qt::KeyboardModifiers modifiers = Qt::NoModifier;
+
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_CTRL, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::ControlModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_ALT, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::AltModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_SHIFT, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::ShiftModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_LOGO, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::MetaModifier;
+
+    return modifiers;
+}
+
+// Possible modifier states.
+static const Qt::KeyboardModifiers ModsTbl[] = {
+    Qt::NoModifier,                                             // 0
+    Qt::ShiftModifier,                                          // 1
+    Qt::ControlModifier,                                        // 2
+    Qt::ControlModifier | Qt::ShiftModifier,                    // 3
+    Qt::AltModifier,                                            // 4
+    Qt::AltModifier | Qt::ShiftModifier,                        // 5
+    Qt::AltModifier | Qt::ControlModifier,                      // 6
+    Qt::AltModifier | Qt::ShiftModifier | Qt::ControlModifier,  // 7
+    Qt::NoModifier                                              // Fall-back to raw Key_*, for non-latin1 kb layouts
+};
+
+QList<int> QXkbCommon::possibleKeys(xkb_state *state, const QKeyEvent *event,
+                                    bool superAsMeta, bool hyperAsMeta)
+{
+    QList<int> result;
+    quint32 keycode = event->nativeScanCode();
+    Qt::KeyboardModifiers modifiers = event->modifiers();
+    xkb_keymap *keymap = xkb_state_get_keymap(state);
+    // turn off the modifier bits which doesn't participate in shortcuts
+    Qt::KeyboardModifiers notNeeded = Qt::KeypadModifier | Qt::GroupSwitchModifier;
+    modifiers &= ~notNeeded;
+    // create a fresh kb state and test against the relevant modifier combinations
+    ScopedXKBState scopedXkbQueryState(xkb_state_new(keymap));
+    xkb_state *queryState = scopedXkbQueryState.get();
+    if (!queryState) {
+        qCWarning(lcXkbcommon) << Q_FUNC_INFO << "failed to compile xkb keymap";
+        return result;
+    }
+    // get kb state from the master state and update the temporary state
+    xkb_layout_index_t lockedLayout = xkb_state_serialize_layout(state, XKB_STATE_LAYOUT_LOCKED);
+    xkb_mod_mask_t latchedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LATCHED);
+    xkb_mod_mask_t lockedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LOCKED);
+    xkb_mod_mask_t depressedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_DEPRESSED);
+    xkb_state_update_mask(queryState, depressedMods, latchedMods, lockedMods, 0, 0, lockedLayout);
+    // handle shortcuts for level three and above
+    xkb_layout_index_t layoutIndex = xkb_state_key_get_layout(queryState, keycode);
+    xkb_level_index_t levelIndex = 0;
+    if (layoutIndex != XKB_LAYOUT_INVALID) {
+        levelIndex = xkb_state_key_get_level(queryState, keycode, layoutIndex);
+        if (levelIndex == XKB_LEVEL_INVALID)
+            levelIndex = 0;
+    }
+    if (levelIndex <= 1)
+        xkb_state_update_mask(queryState, 0, latchedMods, lockedMods, 0, 0, lockedLayout);
+
+    xkb_keysym_t sym = xkb_state_key_get_one_sym(queryState, keycode);
+    if (sym == XKB_KEY_NoSymbol)
+        return result;
+
+    int baseQtKey = keysymToQtKey_internal(sym, modifiers, queryState, keycode, superAsMeta, hyperAsMeta);
+    if (baseQtKey)
+        result += (baseQtKey + modifiers);
+
+    xkb_mod_index_t shiftMod = xkb_keymap_mod_get_index(keymap, "Shift");
+    xkb_mod_index_t altMod = xkb_keymap_mod_get_index(keymap, "Alt");
+    xkb_mod_index_t controlMod = xkb_keymap_mod_get_index(keymap, "Control");
+    xkb_mod_index_t metaMod = xkb_keymap_mod_get_index(keymap, "Meta");
+
+    Q_ASSERT(shiftMod < 32);
+    Q_ASSERT(altMod < 32);
+    Q_ASSERT(controlMod < 32);
+
+    xkb_mod_mask_t depressed;
+    int qtKey = 0;
+    // obtain a list of possible shortcuts for the given key event
+    for (uint i = 1; i < sizeof(ModsTbl) / sizeof(*ModsTbl) ; ++i) {
+        Qt::KeyboardModifiers neededMods = ModsTbl[i];
+        if ((modifiers & neededMods) == neededMods) {
+            if (i == 8) {
+                if (isLatin(baseQtKey))
+                    continue;
+                // add a latin key as a fall back key
+                sym = lookupLatinKeysym(state, keycode);
+            } else {
+                depressed = 0;
+                if (neededMods & Qt::AltModifier)
+                    depressed |= (1 << altMod);
+                if (neededMods & Qt::ShiftModifier)
+                    depressed |= (1 << shiftMod);
+                if (neededMods & Qt::ControlModifier)
+                    depressed |= (1 << controlMod);
+                if (metaMod < 32 && neededMods & Qt::MetaModifier)
+                    depressed |= (1 << metaMod);
+                xkb_state_update_mask(queryState, depressed, latchedMods, lockedMods, 0, 0, lockedLayout);
+                sym = xkb_state_key_get_one_sym(queryState, keycode);
+            }
+            if (sym == XKB_KEY_NoSymbol)
+                continue;
+
+            Qt::KeyboardModifiers mods = modifiers & ~neededMods;
+            qtKey = keysymToQtKey_internal(sym, mods, queryState, keycode, superAsMeta, hyperAsMeta);
+            if (!qtKey || qtKey == baseQtKey)
+                continue;
+
+            // catch only more specific shortcuts, i.e. Ctrl+Shift+= also generates Ctrl++ and +,
+            // but Ctrl++ is more specific than +, so we should skip the last one
+            bool ambiguous = false;
+            for (int shortcut : qAsConst(result)) {
+                if (int(shortcut & ~Qt::KeyboardModifierMask) == qtKey && (shortcut & mods) == mods) {
+                    ambiguous = true;
+                    break;
+                }
+            }
+            if (ambiguous)
+                continue;
+
+            result += (qtKey + mods);
+        }
+    }
+
+    return result;
+}
+
+void QXkbCommon::verifyHasLatinLayout(xkb_keymap *keymap)
+{
+    const xkb_layout_index_t layoutCount = xkb_keymap_num_layouts(keymap);
+    const xkb_keycode_t minKeycode = xkb_keymap_min_keycode(keymap);
+    const xkb_keycode_t maxKeycode = xkb_keymap_max_keycode(keymap);
+
+    const xkb_keysym_t *keysyms = nullptr;
+    int nrLatinKeys = 0;
+    for (xkb_layout_index_t layout = 0; layout < layoutCount; ++layout) {
+        for (xkb_keycode_t code = minKeycode; code < maxKeycode; ++code) {
+            xkb_keymap_key_get_syms_by_level(keymap, code, layout, 0, &keysyms);
+            if (keysyms && isLatin(keysyms[0]))
+                nrLatinKeys++;
+            if (nrLatinKeys > 10) // arbitrarily chosen threshold
+                return;
+        }
+    }
+    // This means that lookupLatinKeysym() will not find anything and latin
+    // key shortcuts might not work. This is a bug in the affected desktop
+    // environment. Usually can be solved via system settings by adding e.g. 'us'
+    // layout to the list of seleced layouts, or by using command line, "setxkbmap
+    // -layout rus,en". The position of latin key based layout in the list of the
+    // selected layouts is irrelevant. Properly functioning desktop environments
+    // handle this behind the scenes, even if no latin key based layout has been
+    // explicitly listed in the selected layouts.
+    qCDebug(lcXkbcommon, "no keyboard layouts with latin keys present");
+}
+
+xkb_keysym_t QXkbCommon::lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode)
+{
+    xkb_layout_index_t layout;
+    xkb_keysym_t sym = XKB_KEY_NoSymbol;
+    xkb_keymap *keymap = xkb_state_get_keymap(state);
+    const xkb_layout_index_t layoutCount = xkb_keymap_num_layouts_for_key(keymap, keycode);
+    const xkb_layout_index_t currentLayout = xkb_state_key_get_layout(state, keycode);
+    // Look at user layouts in the order in which they are defined in system
+    // settings to find a latin keysym.
+    for (layout = 0; layout < layoutCount; ++layout) {
+        if (layout == currentLayout)
+            continue;
+        const xkb_keysym_t *syms = nullptr;
+        xkb_level_index_t level = xkb_state_key_get_level(state, keycode, layout);
+        if (xkb_keymap_key_get_syms_by_level(keymap, keycode, layout, level, &syms) != 1)
+            continue;
+        if (isLatin(syms[0])) {
+            sym = syms[0];
+            break;
+        }
+    }
+
+    if (sym == XKB_KEY_NoSymbol)
+        return sym;
+
+    xkb_mod_mask_t latchedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LATCHED);
+    xkb_mod_mask_t lockedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LOCKED);
+
+    // Check for uniqueness, consider the following setup:
+    // setxkbmap -layout us,ru,us -variant dvorak,, -option 'grp:ctrl_alt_toggle' (set 'ru' as active).
+    // In this setup, the user would expect to trigger a ctrl+q shortcut by pressing ctrl+<physical x key>,
+    // because "US dvorak" is higher up in the layout settings list. This check verifies that an obtained
+    // 'sym' can not be acquired by any other layout higher up in the user's layout list. If it can be acquired
+    // then the obtained key is not unique. This prevents ctrl+<physical q key> from generating a ctrl+q
+    // shortcut in the above described setup. We don't want ctrl+<physical x key> and ctrl+<physical q key> to
+    // generate the same shortcut event in this case.
+    const xkb_keycode_t minKeycode = xkb_keymap_min_keycode(keymap);
+    const xkb_keycode_t maxKeycode = xkb_keymap_max_keycode(keymap);
+    ScopedXKBState queryState(xkb_state_new(keymap));
+    for (xkb_layout_index_t prevLayout = 0; prevLayout < layout; ++prevLayout) {
+        xkb_state_update_mask(queryState.get(), 0, latchedMods, lockedMods, 0, 0, prevLayout);
+        for (xkb_keycode_t code = minKeycode; code < maxKeycode; ++code) {
+            xkb_keysym_t prevSym = xkb_state_key_get_one_sym(queryState.get(), code);
+            if (prevSym == sym) {
+                sym = XKB_KEY_NoSymbol;
+                break;
+            }
+        }
+    }
+
+    return sym;
+}
+
+void QXkbCommon::setXkbContext(QPlatformInputContext *inputContext, struct xkb_context *context)
+{
+    if (!inputContext || !context)
+        return;
+
+    const char *const inputContextClassName = "QComposeInputContext";
+    const char *const normalizedSignature = "setXkbContext(xkb_context*)";
+
+    if (inputContext->objectName() != QLatin1String(inputContextClassName))
+        return;
+
+    static const QMetaMethod setXkbContext = [&]() {
+        int methodIndex = inputContext->metaObject()->indexOfMethod(normalizedSignature);
+        QMetaMethod method = inputContext->metaObject()->method(methodIndex);
+        Q_ASSERT(method.isValid());
+        if (!method.isValid())
+            qCWarning(lcXkbcommon) << normalizedSignature << "not found on" << inputContextClassName;
+        return method;
+    }();
+
+    if (!setXkbContext.isValid())
+        return;
+
+    setXkbContext.invoke(inputContext, Qt::DirectConnection, Q_ARG(struct xkb_context*, context));
+}
+
+QT_END_NAMESPACE
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp
new file mode 100644
index 0000000000..08f43b3b72
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp
@@ -0,0 +1,219 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/* Copyright 1985, 1987, 1990, 1998  The Open Group
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+   Except as contained in this notice, the names of the authors or their
+   institutions shall not be used in advertising or otherwise to promote the
+   sale, use or other dealings in this Software without prior written
+   authorization from the authors.
+
+
+
+   Copyright © 2009 Dan Nicholson
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice (including the next
+   paragraph) shall be included in all copies or substantial portions of the
+   Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+*/
+
+/*
+ XConvertCase was copied from src/3rdparty/xkbcommon/src/keysym.c
+ The following code modifications were applied:
+
+ XConvertCase() was renamed to xkbcommon_XConvertCase(), to not confuse it
+ with Xlib's XConvertCase().
+
+ UCSConvertCase() was renamed to qt_UCSConvertCase() and function's body was
+ replaced to use Qt APIs for doing case conversion, which should give us better
+ results instead of using the less complete version from keysym.c
+*/
+
+#include "qxkbcommon_p.h"
+
+#include <QtCore/QChar>
+
+static void qt_UCSConvertCase(uint32_t code, xkb_keysym_t *lower, xkb_keysym_t *upper)
+{
+    *lower = QChar::toLower(code);
+    *upper = QChar::toUpper(code);
+}
+
+void QXkbCommon::xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper)
+{
+    /* Latin 1 keysym */
+    if (sym < 0x100) {
+        qt_UCSConvertCase(sym, lower, upper);
+        return;
+    }
+
+    /* Unicode keysym */
+    if ((sym & 0xff000000) == 0x01000000) {
+        qt_UCSConvertCase((sym & 0x00ffffff), lower, upper);
+        *upper |= 0x01000000;
+        *lower |= 0x01000000;
+        return;
+    }
+
+    /* Legacy keysym */
+
+    *lower = sym;
+    *upper = sym;
+
+    switch (sym >> 8) {
+    case 1: /* Latin 2 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym == XKB_KEY_Aogonek)
+            *lower = XKB_KEY_aogonek;
+        else if (sym >= XKB_KEY_Lstroke && sym <= XKB_KEY_Sacute)
+            *lower += (XKB_KEY_lstroke - XKB_KEY_Lstroke);
+        else if (sym >= XKB_KEY_Scaron && sym <= XKB_KEY_Zacute)
+            *lower += (XKB_KEY_scaron - XKB_KEY_Scaron);
+        else if (sym >= XKB_KEY_Zcaron && sym <= XKB_KEY_Zabovedot)
+            *lower += (XKB_KEY_zcaron - XKB_KEY_Zcaron);
+        else if (sym == XKB_KEY_aogonek)
+            *upper = XKB_KEY_Aogonek;
+        else if (sym >= XKB_KEY_lstroke && sym <= XKB_KEY_sacute)
+            *upper -= (XKB_KEY_lstroke - XKB_KEY_Lstroke);
+        else if (sym >= XKB_KEY_scaron && sym <= XKB_KEY_zacute)
+            *upper -= (XKB_KEY_scaron - XKB_KEY_Scaron);
+        else if (sym >= XKB_KEY_zcaron && sym <= XKB_KEY_zabovedot)
+            *upper -= (XKB_KEY_zcaron - XKB_KEY_Zcaron);
+        else if (sym >= XKB_KEY_Racute && sym <= XKB_KEY_Tcedilla)
+            *lower += (XKB_KEY_racute - XKB_KEY_Racute);
+        else if (sym >= XKB_KEY_racute && sym <= XKB_KEY_tcedilla)
+            *upper -= (XKB_KEY_racute - XKB_KEY_Racute);
+        break;
+    case 2: /* Latin 3 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Hstroke && sym <= XKB_KEY_Hcircumflex)
+            *lower += (XKB_KEY_hstroke - XKB_KEY_Hstroke);
+        else if (sym >= XKB_KEY_Gbreve && sym <= XKB_KEY_Jcircumflex)
+            *lower += (XKB_KEY_gbreve - XKB_KEY_Gbreve);
+        else if (sym >= XKB_KEY_hstroke && sym <= XKB_KEY_hcircumflex)
+            *upper -= (XKB_KEY_hstroke - XKB_KEY_Hstroke);
+        else if (sym >= XKB_KEY_gbreve && sym <= XKB_KEY_jcircumflex)
+            *upper -= (XKB_KEY_gbreve - XKB_KEY_Gbreve);
+        else if (sym >= XKB_KEY_Cabovedot && sym <= XKB_KEY_Scircumflex)
+            *lower += (XKB_KEY_cabovedot - XKB_KEY_Cabovedot);
+        else if (sym >= XKB_KEY_cabovedot && sym <= XKB_KEY_scircumflex)
+            *upper -= (XKB_KEY_cabovedot - XKB_KEY_Cabovedot);
+        break;
+    case 3: /* Latin 4 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Rcedilla && sym <= XKB_KEY_Tslash)
+            *lower += (XKB_KEY_rcedilla - XKB_KEY_Rcedilla);
+        else if (sym >= XKB_KEY_rcedilla && sym <= XKB_KEY_tslash)
+            *upper -= (XKB_KEY_rcedilla - XKB_KEY_Rcedilla);
+        else if (sym == XKB_KEY_ENG)
+            *lower = XKB_KEY_eng;
+        else if (sym == XKB_KEY_eng)
+            *upper = XKB_KEY_ENG;
+        else if (sym >= XKB_KEY_Amacron && sym <= XKB_KEY_Umacron)
+            *lower += (XKB_KEY_amacron - XKB_KEY_Amacron);
+        else if (sym >= XKB_KEY_amacron && sym <= XKB_KEY_umacron)
+            *upper -= (XKB_KEY_amacron - XKB_KEY_Amacron);
+        break;
+    case 6: /* Cyrillic */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Serbian_DJE && sym <= XKB_KEY_Serbian_DZE)
+            *lower -= (XKB_KEY_Serbian_DJE - XKB_KEY_Serbian_dje);
+        else if (sym >= XKB_KEY_Serbian_dje && sym <= XKB_KEY_Serbian_dze)
+            *upper += (XKB_KEY_Serbian_DJE - XKB_KEY_Serbian_dje);
+        else if (sym >= XKB_KEY_Cyrillic_YU && sym <= XKB_KEY_Cyrillic_HARDSIGN)
+            *lower -= (XKB_KEY_Cyrillic_YU - XKB_KEY_Cyrillic_yu);
+        else if (sym >= XKB_KEY_Cyrillic_yu && sym <= XKB_KEY_Cyrillic_hardsign)
+            *upper += (XKB_KEY_Cyrillic_YU - XKB_KEY_Cyrillic_yu);
+        break;
+    case 7: /* Greek */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Greek_ALPHAaccent && sym <= XKB_KEY_Greek_OMEGAaccent)
+            *lower += (XKB_KEY_Greek_alphaaccent - XKB_KEY_Greek_ALPHAaccent);
+        else if (sym >= XKB_KEY_Greek_alphaaccent && sym <= XKB_KEY_Greek_omegaaccent &&
+             sym != XKB_KEY_Greek_iotaaccentdieresis &&
+             sym != XKB_KEY_Greek_upsilonaccentdieresis)
+            *upper -= (XKB_KEY_Greek_alphaaccent - XKB_KEY_Greek_ALPHAaccent);
+        else if (sym >= XKB_KEY_Greek_ALPHA && sym <= XKB_KEY_Greek_OMEGA)
+            *lower += (XKB_KEY_Greek_alpha - XKB_KEY_Greek_ALPHA);
+        else if (sym >= XKB_KEY_Greek_alpha && sym <= XKB_KEY_Greek_omega &&
+             sym != XKB_KEY_Greek_finalsmallsigma)
+            *upper -= (XKB_KEY_Greek_alpha - XKB_KEY_Greek_ALPHA);
+        break;
+    case 0x13: /* Latin 9 */
+        if (sym == XKB_KEY_OE)
+            *lower = XKB_KEY_oe;
+        else if (sym == XKB_KEY_oe)
+            *upper = XKB_KEY_OE;
+        else if (sym == XKB_KEY_Ydiaeresis)
+            *lower = XKB_KEY_ydiaeresis;
+        break;
+    }
+}
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon_p.h b/src/platformsupport/input/xkbcommon/qxkbcommon_p.h
new file mode 100644
index 0000000000..561eae03db
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon_p.h
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QXKBCOMMON_P_H
+#define QXKBCOMMON_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QString>
+#include <QtCore/QVector>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/QList>
+
+#include <xkbcommon/xkbcommon.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcXkbcommon)
+
+class QEvent;
+class QKeyEvent;
+class QPlatformInputContext;
+
+class QXkbCommon
+{
+public:
+    static QString lookupString(struct xkb_state *state, xkb_keycode_t code);
+    static QString lookupStringNoKeysymTransformations(xkb_keysym_t keysym);
+
+    static QVector<xkb_keysym_t> toKeysym(QKeyEvent *event);
+
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers);
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                             xkb_state *state, xkb_keycode_t code,
+                             bool superAsMeta = false, bool hyperAsMeta = false);
+
+    // xkbcommon_* API is part of libxkbcommon internals, with modifications as
+    // desribed in the header of the implementation file.
+    static void xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper);
+    static xkb_keysym_t qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks);
+
+    static Qt::KeyboardModifiers modifiers(struct xkb_state *state);
+
+    static QList<int> possibleKeys(xkb_state *state, const QKeyEvent *event,
+                                   bool superAsMeta = false, bool hyperAsMeta = false);
+
+    static void verifyHasLatinLayout(xkb_keymap *keymap);
+    static xkb_keysym_t lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode);
+
+    static bool isLatin(xkb_keysym_t sym) {
+        return ((sym >= 'a' && sym <= 'z') || (sym >= 'A' && sym <= 'Z'));
+    }
+    static bool isKeypad(xkb_keysym_t sym) {
+        return sym >= XKB_KEY_KP_Space && sym <= XKB_KEY_KP_9;
+    }
+
+    static void setXkbContext(QPlatformInputContext *inputContext, struct xkb_context *context);
+
+    struct XKBStateDeleter {
+        void operator()(struct xkb_state *state) const { return xkb_state_unref(state); }
+    };
+    struct XKBKeymapDeleter {
+        void operator()(struct xkb_keymap *keymap) const { return xkb_keymap_unref(keymap); }
+    };
+    struct XKBContextDeleter {
+        void operator()(struct xkb_context *context) const { return xkb_context_unref(context); }
+    };
+    using ScopedXKBState = std::unique_ptr<struct xkb_state, XKBStateDeleter>;
+    using ScopedXKBKeymap = std::unique_ptr<struct xkb_keymap, XKBKeymapDeleter>;
+    using ScopedXKBContext = std::unique_ptr<struct xkb_context, XKBContextDeleter>;
+};
+
+QT_END_NAMESPACE
+
+#endif // QXKBCOMMON_P_H
diff --git a/src/platformsupport/input/xkbcommon/xkbcommon.pro b/src/platformsupport/input/xkbcommon/xkbcommon.pro
new file mode 100644
index 0000000000..22b16ae44a
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/xkbcommon.pro
@@ -0,0 +1,23 @@
+TARGET = QtXkbCommonSupport
+MODULE = xkbcommon_support
+
+QT = core-private gui-private
+CONFIG += static internal_module
+
+DEFINES += QT_NO_CAST_FROM_ASCII
+PRECOMPILED_HEADER = ../../../corelib/global/qt_pch.h
+
+QMAKE_USE += xkbcommon
+
+HEADERS += \
+    qxkbcommon_p.h
+
+SOURCES += \
+    qxkbcommon.cpp \
+    qxkbcommon_3rdparty.cpp
+
+# qxkbcommon.cpp::KeyTbl has more than 256 levels of expansion and older
+# Clang uses that as a limit (it's 1024 in current versions).
+clang:!intel_icc: QMAKE_CXXFLAGS += -ftemplate-depth=1024
+
+load(qt_module)
diff --git a/src/platformsupport/kmsconvenience/qkmsdevice.cpp b/src/platformsupport/kmsconvenience/qkmsdevice.cpp
index ef81f6162d..4b27522976 100644
--- a/src/platformsupport/kmsconvenience/qkmsdevice.cpp
+++ b/src/platformsupport/kmsconvenience/qkmsdevice.cpp
@@ -777,9 +777,7 @@ void QKmsDevice::discoverPlanes()
         for (int i = 0; i < countFormats; ++i) {
             uint32_t f = drmplane->formats[i];
             plane.supportedFormats.append(f);
-            QString s;
-            s.sprintf("%c%c%c%c ", f, f >> 8, f >> 16, f >> 24);
-            formatStr += s;
+            formatStr += QString::asprintf("%c%c%c%c ", f, f >> 8, f >> 16, f >> 24);
         }
 
         qCDebug(qLcKmsDebug, "plane %d: id = %u countFormats = %d possibleCrtcs = 0x%x supported formats = %s",
diff --git a/src/platformsupport/linuxaccessibility/atspiadaptor_p.h b/src/platformsupport/linuxaccessibility/atspiadaptor_p.h
index b5704f53ad..0b624389a3 100644
--- a/src/platformsupport/linuxaccessibility/atspiadaptor_p.h
+++ b/src/platformsupport/linuxaccessibility/atspiadaptor_p.h
@@ -76,7 +76,7 @@ class AtSpiAdaptor :public QDBusVirtualObject
     Q_OBJECT
 
 public:
-    explicit AtSpiAdaptor(DBusConnection *connection, QObject *parent = 0);
+    explicit AtSpiAdaptor(DBusConnection *connection, QObject *parent = nullptr);
     ~AtSpiAdaptor();
 
     void registerApplication();
diff --git a/src/platformsupport/linuxaccessibility/cache_p.h b/src/platformsupport/linuxaccessibility/cache_p.h
index e8529b779b..cc55acc6f8 100644
--- a/src/platformsupport/linuxaccessibility/cache_p.h
+++ b/src/platformsupport/linuxaccessibility/cache_p.h
@@ -65,7 +65,7 @@ class QSpiDBusCache : public QObject
     Q_OBJECT
 
 public:
-    explicit QSpiDBusCache(QDBusConnection c, QObject* parent = 0);
+    explicit QSpiDBusCache(QDBusConnection c, QObject* parent = nullptr);
     void emitAddAccessible(const QSpiAccessibleCacheItem& item);
     void emitRemoveAccessible(const QSpiObjectReference& item);
 
diff --git a/src/platformsupport/linuxaccessibility/constant_mappings.cpp b/src/platformsupport/linuxaccessibility/constant_mappings.cpp
index de4a68dc5b..ef2b3429d2 100644
--- a/src/platformsupport/linuxaccessibility/constant_mappings.cpp
+++ b/src/platformsupport/linuxaccessibility/constant_mappings.cpp
@@ -83,6 +83,8 @@ quint64 spiStatesFromQState(QAccessible::State state)
     //        if (state.HotTracked)
     if (state.defaultButton)
         setSpiStateBit(&spiState, ATSPI_STATE_IS_DEFAULT);
+    if (state.expandable)
+        setSpiStateBit(&spiState, ATSPI_STATE_EXPANDABLE);
     if (state.expanded)
         setSpiStateBit(&spiState, ATSPI_STATE_EXPANDED);
     if (state.collapsed)
diff --git a/src/platformsupport/linuxaccessibility/dbusconnection_p.h b/src/platformsupport/linuxaccessibility/dbusconnection_p.h
index 4030fabc22..860c18ca05 100644
--- a/src/platformsupport/linuxaccessibility/dbusconnection_p.h
+++ b/src/platformsupport/linuxaccessibility/dbusconnection_p.h
@@ -65,7 +65,7 @@ class DBusConnection : public QObject
     Q_OBJECT
 
 public:
-    DBusConnection(QObject *parent = 0);
+    DBusConnection(QObject *parent = nullptr);
     QDBusConnection connection() const;
     bool isEnabled() const { return m_enabled; }
 
diff --git a/src/platformsupport/services/genericunix/qgenericunixservices.cpp b/src/platformsupport/services/genericunix/qgenericunixservices.cpp
index 67884cef92..734bdcaf75 100644
--- a/src/platformsupport/services/genericunix/qgenericunixservices.cpp
+++ b/src/platformsupport/services/genericunix/qgenericunixservices.cpp
@@ -45,7 +45,9 @@
 #if QT_CONFIG(process)
 # include <QtCore/QProcess>
 #endif
+#if QT_CONFIG(settings)
 #include <QtCore/QSettings>
+#endif
 #include <QtCore/QStandardPaths>
 #include <QtCore/QUrl>
 
@@ -93,7 +95,7 @@ static inline QByteArray detectDesktopEnvironment()
     // This can be a path in /usr/share/xsessions
     int slash = desktopSession.lastIndexOf('/');
     if (slash != -1) {
-#ifndef QT_NO_SETTINGS
+#if QT_CONFIG(settings)
         QSettings desktopFile(QFile::decodeName(desktopSession + ".desktop"), QSettings::IniFormat);
         desktopFile.beginGroup(QStringLiteral("Desktop Entry"));
         QByteArray desktopName = desktopFile.value(QStringLiteral("DesktopNames")).toByteArray();
@@ -177,7 +179,15 @@ static inline bool checkNeedPortalSupport()
     return !QStandardPaths::locate(QStandardPaths::RuntimeLocation, QLatin1String("flatpak-info")).isEmpty() || qEnvironmentVariableIsSet("SNAP");
 }
 
-static inline bool xdgDesktopPortalOpenFile(const QUrl &url)
+static inline bool isPortalReturnPermanent(const QDBusError &error)
+{
+    // A service unknown error isn't permanent, it just indicates that we
+    // should fall back to the regular way. This check includes
+    // QDBusError::NoError.
+    return error.type() != QDBusError::ServiceUnknown;
+}
+
+static inline QDBusMessage xdgDesktopPortalOpenFile(const QUrl &url)
 {
     // DBus signature:
     // OpenFile (IN   s      parent_window,
@@ -196,23 +206,22 @@ static inline bool xdgDesktopPortalOpenFile(const QUrl &url)
                                                               QLatin1String("org.freedesktop.portal.OpenURI"),
                                                               QLatin1String("OpenFile"));
 
-        QDBusUnixFileDescriptor descriptor(fd);
-        qt_safe_close(fd);
+        QDBusUnixFileDescriptor descriptor;
+        descriptor.giveFileDescriptor(fd);
 
         // FIXME parent_window_id and handle writable option
         message << QString() << QVariant::fromValue(descriptor) << QVariantMap();
 
-        QDBusPendingReply<QDBusObjectPath> reply = QDBusConnection::sessionBus().call(message);
-        return !reply.isError();
+        return QDBusConnection::sessionBus().call(message);
     }
 #else
     Q_UNUSED(url)
 #endif
 
-    return false;
+    return QDBusMessage::createError(QDBusError::InternalError, qt_error_string());
 }
 
-static inline bool xdgDesktopPortalOpenUrl(const QUrl &url)
+static inline QDBusMessage xdgDesktopPortalOpenUrl(const QUrl &url)
 {
     // DBus signature:
     // OpenURI (IN   s      parent_window,
@@ -232,11 +241,10 @@ static inline bool xdgDesktopPortalOpenUrl(const QUrl &url)
     // FIXME parent_window_id and handle writable option
     message << QString() << url.toString() << QVariantMap();
 
-    QDBusPendingReply<QDBusObjectPath> reply = QDBusConnection::sessionBus().call(message);
-    return !reply.isError();
+    return QDBusConnection::sessionBus().call(message);
 }
 
-static inline bool xdgDesktopPortalSendEmail(const QUrl &url)
+static inline QDBusMessage xdgDesktopPortalSendEmail(const QUrl &url)
 {
     // DBus signature:
     // ComposeEmail (IN   s      parent_window,
@@ -279,8 +287,7 @@ static inline bool xdgDesktopPortalSendEmail(const QUrl &url)
     // FIXME parent_window_id
     message << QString() << options;
 
-    QDBusPendingReply<QDBusObjectPath> reply = QDBusConnection::sessionBus().call(message);
-    return !reply.isError();
+    return QDBusConnection::sessionBus().call(message);
 }
 #endif // QT_CONFIG(dbus)
 
@@ -294,15 +301,23 @@ bool QGenericUnixServices::openUrl(const QUrl &url)
 {
     if (url.scheme() == QLatin1String("mailto")) {
 #if QT_CONFIG(dbus)
-        if (checkNeedPortalSupport())
-            return xdgDesktopPortalSendEmail(url);
+        if (checkNeedPortalSupport()) {
+            QDBusError error = xdgDesktopPortalSendEmail(url);
+            if (isPortalReturnPermanent(error))
+                return !error.isValid();
+
+            // service not running, fall back
+        }
 #endif
         return openDocument(url);
     }
 
 #if QT_CONFIG(dbus)
-    if (checkNeedPortalSupport())
-        return xdgDesktopPortalOpenUrl(url);
+    if (checkNeedPortalSupport()) {
+        QDBusError error = xdgDesktopPortalOpenUrl(url);
+        if (isPortalReturnPermanent(error))
+            return !error.isValid();
+    }
 #endif
 
     if (m_webBrowser.isEmpty() && !detectWebBrowser(desktopEnvironment(), true, &m_webBrowser)) {
@@ -315,8 +330,11 @@ bool QGenericUnixServices::openUrl(const QUrl &url)
 bool QGenericUnixServices::openDocument(const QUrl &url)
 {
 #if QT_CONFIG(dbus)
-    if (checkNeedPortalSupport())
-        return xdgDesktopPortalOpenFile(url);
+    if (checkNeedPortalSupport()) {
+        QDBusError error = xdgDesktopPortalOpenFile(url);
+        if (isPortalReturnPermanent(error))
+            return !error.isValid();
+    }
 #endif
 
     if (m_documentLauncher.isEmpty() && !detectWebBrowser(desktopEnvironment(), false, &m_documentLauncher)) {
diff --git a/src/platformsupport/themes/genericunix/dbusmenu/qdbusmenuconnection_p.h b/src/platformsupport/themes/genericunix/dbusmenu/qdbusmenuconnection_p.h
index c7c3f4bc5b..565af6c947 100644
--- a/src/platformsupport/themes/genericunix/dbusmenu/qdbusmenuconnection_p.h
+++ b/src/platformsupport/themes/genericunix/dbusmenu/qdbusmenuconnection_p.h
@@ -67,7 +67,7 @@ class QDBusMenuConnection : public QObject
     Q_OBJECT
 
 public:
-    QDBusMenuConnection(QObject *parent = 0, const QString &serviceName = QString());
+    QDBusMenuConnection(QObject *parent = nullptr, const QString &serviceName = QString());
     QDBusConnection connection() const { return m_connection; }
     QDBusServiceWatcher *dbusWatcher() const { return m_dbusWatcher; }
     bool isStatusNotifierHostRegistered() const { return m_statusNotifierHostRegistered; }
diff --git a/src/platformsupport/themes/genericunix/dbustray/qxdgnotificationproxy_p.h b/src/platformsupport/themes/genericunix/dbustray/qxdgnotificationproxy_p.h
index 352b4aa5d6..ab99ea65dd 100644
--- a/src/platformsupport/themes/genericunix/dbustray/qxdgnotificationproxy_p.h
+++ b/src/platformsupport/themes/genericunix/dbustray/qxdgnotificationproxy_p.h
@@ -88,7 +88,7 @@ public:
 
 public:
     QXdgNotificationInterface(const QString &service, const QString &path,
-                              const QDBusConnection &connection, QObject *parent = 0);
+                              const QDBusConnection &connection, QObject *parent = nullptr);
 
     ~QXdgNotificationInterface();
 
diff --git a/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp b/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp
index 63a860f251..7b3f9b624a 100644
--- a/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp
+++ b/src/platformsupport/themes/genericunix/qgenericunixthemes.cpp
@@ -49,9 +49,13 @@
 #include <QtCore/QFile>
 #include <QtCore/QDebug>
 #include <QtCore/QHash>
+#if QT_CONFIG(mimetype)
 #include <QtCore/QMimeDatabase>
+#endif
 #include <QtCore/QLoggingCategory>
+#if QT_CONFIG(settings)
 #include <QtCore/QSettings>
+#endif
 #include <QtCore/QVariant>
 #include <QtCore/QStandardPaths>
 #include <QtCore/QStringList>
@@ -168,15 +172,9 @@ QStringList QGenericUnixTheme::xdgIconThemePaths()
     if (homeIconDir.isDir())
         paths.prepend(homeIconDir.absoluteFilePath());
 
-    QString xdgDirString = QFile::decodeName(qgetenv("XDG_DATA_DIRS"));
-    if (xdgDirString.isEmpty())
-        xdgDirString = QLatin1String("/usr/local/share/:/usr/share/");
-    const auto xdgDirs = xdgDirString.splitRef(QLatin1Char(':'));
-    for (const QStringRef &xdgDir : xdgDirs) {
-        const QFileInfo xdgIconsDir(xdgDir + QLatin1String("/icons"));
-        if (xdgIconsDir.isDir())
-            paths.append(xdgIconsDir.absoluteFilePath());
-    }
+    paths.append(QStandardPaths::locateAll(QStandardPaths::GenericDataLocation,
+                                           QStringLiteral("icons"),
+                                           QStandardPaths::LocateDirectory));
 
     return paths;
 }
@@ -259,7 +257,7 @@ static QIcon xdgFileIcon(const QFileInfo &fileInfo)
 }
 #endif
 
-#ifndef QT_NO_SETTINGS
+#if QT_CONFIG(settings)
 class QKdeThemePrivate : public QPlatformThemePrivate
 {
 public:
@@ -686,7 +684,7 @@ QPlatformSystemTrayIcon *QKdeTheme::createPlatformSystemTrayIcon() const
 }
 #endif
 
-#endif // QT_NO_SETTINGS
+#endif // settings
 
 /*!
     \class QGnomeTheme
@@ -832,7 +830,7 @@ QPlatformTheme *QGenericUnixTheme::createUnixTheme(const QString &name)
 {
     if (name == QLatin1String(QGenericUnixTheme::name))
         return new QGenericUnixTheme;
-#ifndef QT_NO_SETTINGS
+#if QT_CONFIG(settings)
     if (name == QLatin1String(QKdeTheme::name))
         if (QPlatformTheme *kdeTheme = QKdeTheme::createKdeTheme())
             return kdeTheme;
@@ -857,7 +855,7 @@ QStringList QGenericUnixTheme::themeNames()
         const QList<QByteArray> desktopNames = desktopEnvironment.split(':');
         for (const QByteArray &desktopName : desktopNames) {
             if (desktopEnvironment == "KDE") {
-#ifndef QT_NO_SETTINGS
+#if QT_CONFIG(settings)
                 result.push_back(QLatin1String(QKdeTheme::name));
 #endif
             } else if (gtkBasedEnvironments.contains(desktopName)) {
diff --git a/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
index 865a624694..c0da9d8370 100644
--- a/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
+++ b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
@@ -96,7 +96,7 @@ public:
     static const char *name;
 };
 
-#ifndef QT_NO_SETTINGS
+#if QT_CONFIG(settings)
 class QKdeThemePrivate;
 
 class QKdeTheme : public QPlatformTheme
@@ -109,7 +109,7 @@ public:
     QVariant themeHint(ThemeHint hint) const override;
 
     QIcon fileIcon(const QFileInfo &fileInfo,
-                   QPlatformTheme::IconOptions iconOptions = 0) const override;
+                   QPlatformTheme::IconOptions iconOptions = nullptr) const override;
 
     const QPalette *palette(Palette type = SystemPalette) const override;
 
@@ -123,7 +123,7 @@ public:
 
     static const char *name;
 };
-#endif // QT_NO_SETTINGS
+#endif // settings
 
 class QGnomeThemePrivate;
 
@@ -134,7 +134,7 @@ public:
     QGnomeTheme();
     QVariant themeHint(ThemeHint hint) const override;
     QIcon fileIcon(const QFileInfo &fileInfo,
-                   QPlatformTheme::IconOptions = 0) const override;
+                   QPlatformTheme::IconOptions = nullptr) const override;
     const QFont *font(Font type) const override;
     QString standardButtonText(int button) const override;
 
diff --git a/src/platformsupport/themes/qabstractfileiconengine.cpp b/src/platformsupport/themes/qabstractfileiconengine.cpp
index 192ed00510..c5800d9119 100644
--- a/src/platformsupport/themes/qabstractfileiconengine.cpp
+++ b/src/platformsupport/themes/qabstractfileiconengine.cpp
@@ -76,7 +76,7 @@ QPixmap QAbstractFileIconEngine::pixmap(const QSize &size, QIcon::Mode mode,
     key += QLatin1Char('_') + QString::number(size.width());
 
     QPixmap result;
-    if (!QPixmapCache::find(key, result)) {
+    if (!QPixmapCache::find(key, &result)) {
         result = filePixmap(size, mode, state);
         if (!result.isNull())
             QPixmapCache::insert(key, result);
diff --git a/src/platformsupport/vkconvenience/CMakeLists.txt b/src/platformsupport/vkconvenience/CMakeLists.txt
index 23d7c6ffec..106f78fb3d 100644
--- a/src/platformsupport/vkconvenience/CMakeLists.txt
+++ b/src/platformsupport/vkconvenience/CMakeLists.txt
@@ -13,7 +13,6 @@ add_qt_module(VulkanSupport
     LIBRARIES
         Qt::CorePrivate
         Qt::GuiPrivate
-        Vulkan::Vulkan # special case
 )
 
 #### Keys ignored in scope 1:.:vkconvenience.pro:<NONE>: