XCB: Use member initialization

Shorten or remove constructors accordingly.

Change-Id: I9c8bcf512c922c3c72be8a965d9557589bc9874f
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>

15 files changed, 104 insertions, 179 deletions

diff --git a/src/plugins/platforms/xcb/qxcbclipboard.cpp b/src/plugins/platforms/xcb/qxcbclipboard.cpp
index cee011bbdf..6a5d40267a 100644
--- a/src/plugins/platforms/xcb/qxcbclipboard.cpp
+++ b/src/plugins/platforms/xcb/qxcbclipboard.cpp
@@ -267,11 +267,6 @@ const int QXcbClipboard::clipboard_timeout = 5000;
 
 QXcbClipboard::QXcbClipboard(QXcbConnection *c)
     : QXcbObject(c), QPlatformClipboard()
-    , m_requestor(XCB_NONE)
-    , m_owner(XCB_NONE)
-    , m_incr_active(false)
-    , m_clipboard_closing(false)
-    , m_incr_receive_time(0)
 {
     Q_ASSERT(QClipboard::Clipboard == 0);
     Q_ASSERT(QClipboard::Selection == 1);
diff --git a/src/plugins/platforms/xcb/qxcbclipboard.h b/src/plugins/platforms/xcb/qxcbclipboard.h
index a0a4f4e5a1..bfeae13e10 100644
--- a/src/plugins/platforms/xcb/qxcbclipboard.h
+++ b/src/plugins/platforms/xcb/qxcbclipboard.h
@@ -102,14 +102,14 @@ private:
     QMimeData *m_clientClipboard[2];
     xcb_timestamp_t m_timestamp[2];
 
-    xcb_window_t m_requestor;
-    xcb_window_t m_owner;
+    xcb_window_t m_requestor = XCB_NONE;
+    xcb_window_t m_owner = XCB_NONE;
 
     static const int clipboard_timeout;
 
-    bool m_incr_active;
-    bool m_clipboard_closing;
-    xcb_timestamp_t m_incr_receive_time;
+    bool m_incr_active = false;
+    bool m_clipboard_closing = false;
+    xcb_timestamp_t m_incr_receive_time = 0;
 };
 
 #endif // QT_NO_CLIPBOARD
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index 915c29edcc..3444b21654 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -552,32 +552,10 @@ void QXcbConnection::initializeScreens()
 }
 
 QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGrabServer, xcb_visualid_t defaultVisualId, const char *displayName)
-    : m_connection(0)
-    , m_canGrabServer(canGrabServer)
+    : m_canGrabServer(canGrabServer)
     , m_defaultVisualId(defaultVisualId)
-    , m_primaryScreenNumber(0)
     , m_displayName(displayName ? QByteArray(displayName) : qgetenv("DISPLAY"))
     , m_nativeInterface(nativeInterface)
-#ifdef XCB_USE_XLIB
-    , m_xlib_display(0)
-#endif
-    , xfixes_first_event(0)
-    , xrandr_first_event(0)
-    , xkb_first_event(0)
-    , has_xinerama_extension(false)
-    , has_shape_extension(false)
-    , has_randr_extension(false)
-    , has_input_shape(false)
-    , has_xkb(false)
-    , m_buttons(0)
-    , m_focusWindow(0)
-    , m_mouseGrabber(0)
-    , m_mousePressWindow(0)
-    , m_clientLeader(0)
-    , m_systemTrayTracker(0)
-    , m_glIntegration(Q_NULLPTR)
-    , m_xiGrab(false)
-    , m_qtSelectionOwner(0)
 {
 #ifdef XCB_USE_XLIB
     Display *dpy = XOpenDisplay(m_displayName.constData());
@@ -618,9 +596,6 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
 
     initializeAllAtoms();
 
-    m_time = XCB_CURRENT_TIME;
-    m_netWmUserTime = XCB_CURRENT_TIME;
-
     if (!qEnvironmentVariableIsSet("QT_XCB_NO_XRANDR"))
         initializeXRandr();
     if (!has_randr_extension)
@@ -630,7 +605,6 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
 
     initializeXRender();
 #if defined(XCB_USE_XINPUT2)
-    m_xi2Enabled = false;
     initializeXInput2();
 #endif
     initializeXShape();
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index 19c076e888..7f0d5cf2cc 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -551,10 +551,9 @@ private:
     void destroyScreen(QXcbScreen *screen);
     void initializeScreens();
     bool compressEvent(xcb_generic_event_t *event, int currentIndex, QXcbEventArray *eventqueue) const;
-
 #ifdef XCB_USE_XINPUT2
-    bool m_xi2Enabled;
-    int m_xi2Minor;
+    bool m_xi2Enabled = false;
+    int m_xi2Minor = 2;
     void initializeXInput2();
     void finalizeXInput2();
     void xi2SetupDevices();
@@ -568,20 +567,17 @@ private:
 #endif // XCB_USE_XINPUT22
 #ifndef QT_NO_TABLETEVENT
     struct TabletData {
-        TabletData() : deviceId(0), pointerType(QTabletEvent::UnknownPointer),
-            tool(QTabletEvent::Stylus), buttons(0), serialId(0), inProximity(false) { }
-        int deviceId;
-        QTabletEvent::PointerType pointerType;
-        QTabletEvent::TabletDevice tool;
-        Qt::MouseButtons buttons;
-        qint64 serialId;
-        bool inProximity;
+        int deviceId = 0;
+        QTabletEvent::PointerType pointerType = QTabletEvent::UnknownPointer;
+        QTabletEvent::TabletDevice tool = QTabletEvent::Stylus;
+        Qt::MouseButtons buttons = 0;
+        qint64 serialId = 0;
+        bool inProximity = false;
         struct ValuatorClassInfo {
-            ValuatorClassInfo() : minVal(0.), maxVal(0.), curVal(0.) { }
-            double minVal;
-            double maxVal;
-            double curVal;
-            int number;
+            double minVal = 0;
+            double maxVal = 0;
+            double curVal = 0;
+            int number = -1;
         };
         QHash<int, ValuatorClassInfo> valuatorInfo;
     };
@@ -593,12 +589,13 @@ private:
     TabletData *tabletDataForDevice(int id);
 #endif // !QT_NO_TABLETEVENT
     struct ScrollingDevice {
-        ScrollingDevice() : deviceId(0), verticalIndex(0), horizontalIndex(0), orientations(0), legacyOrientations(0) { }
-        int deviceId;
-        int verticalIndex, horizontalIndex;
-        double verticalIncrement, horizontalIncrement;
-        Qt::Orientations orientations;
-        Qt::Orientations legacyOrientations;
+        int deviceId = 0;
+        int verticalIndex = 0;
+        int horizontalIndex = 0;
+        double verticalIncrement = 0;
+        double horizontalIncrement = 0;
+        Qt::Orientations orientations = 0;
+        Qt::Orientations legacyOrientations = 0;
         QPointF lastScrollPosition;
     };
     void updateScrollingDevice(ScrollingDevice& scrollingDevice, int num_classes, void *classes);
@@ -609,36 +606,36 @@ private:
     static void xi2PrepareXIGenericDeviceEvent(xcb_ge_event_t *event);
 #endif
 
-    xcb_connection_t *m_connection;
-    const xcb_setup_t *m_setup;
-    bool m_canGrabServer;
-    xcb_visualid_t m_defaultVisualId;
+    xcb_connection_t *m_connection = nullptr;
+    const xcb_setup_t *m_setup = nullptr;
+    const bool m_canGrabServer;
+    const xcb_visualid_t m_defaultVisualId;
 
     QList<QXcbVirtualDesktop *> m_virtualDesktops;
     QList<QXcbScreen *> m_screens;
-    int m_primaryScreenNumber;
+    int m_primaryScreenNumber = 0;
 
     xcb_atom_t m_allAtoms[QXcbAtom::NAtoms];
 
-    xcb_timestamp_t m_time;
-    xcb_timestamp_t m_netWmUserTime;
+    xcb_timestamp_t m_time = XCB_CURRENT_TIME;
+    xcb_timestamp_t m_netWmUserTime = XCB_CURRENT_TIME;
 
     QByteArray m_displayName;
 
-    QXcbKeyboard *m_keyboard;
+    QXcbKeyboard *m_keyboard = nullptr;
 #ifndef QT_NO_CLIPBOARD
-    QXcbClipboard *m_clipboard;
+    QXcbClipboard *m_clipboard = nullptr;
 #endif
 #ifndef QT_NO_DRAGANDDROP
-    QXcbDrag *m_drag;
+    QXcbDrag *m_drag = nullptr;
 #endif
     QScopedPointer<QXcbWMSupport> m_wmSupport;
-    QXcbNativeInterface *m_nativeInterface;
+    QXcbNativeInterface *m_nativeInterface = nullptr;
 
 #if defined(XCB_USE_XLIB)
-    void *m_xlib_display;
+    void *m_xlib_display = nullptr;
 #endif
-    QXcbEventReader *m_reader;
+    QXcbEventReader *m_reader = nullptr;
 #if defined(XCB_USE_XINPUT2)
     QHash<int, XInput2TouchDeviceData*> m_touchDevices;
 #ifdef XCB_USE_XINPUT22
@@ -671,29 +668,29 @@ private:
 
     QVector<PeekFunc> m_peekFuncs;
 
-    uint32_t xfixes_first_event;
-    uint32_t xrandr_first_event;
-    uint32_t xkb_first_event;
+    uint32_t xfixes_first_event = 0;
+    uint32_t xrandr_first_event = 0;
+    uint32_t xkb_first_event = 0;
 
-    bool has_xinerama_extension;
-    bool has_shape_extension;
-    bool has_randr_extension;
+    bool has_xinerama_extension = false;
+    bool has_shape_extension = false;
+    bool has_randr_extension = false;
     bool has_input_shape;
-    bool has_xkb;
+    bool has_xkb = false;
 
-    Qt::MouseButtons m_buttons;
+    Qt::MouseButtons m_buttons = 0;
 
-    QXcbWindow *m_focusWindow;
-    QXcbWindow *m_mouseGrabber;
-    QXcbWindow *m_mousePressWindow;
+    QXcbWindow *m_focusWindow = nullptr;
+    QXcbWindow *m_mouseGrabber = nullptr;
+    QXcbWindow *m_mousePressWindow = nullptr;
 
-    xcb_window_t m_clientLeader;
+    xcb_window_t m_clientLeader = 0;
     QByteArray m_startupId;
-    QXcbSystemTrayTracker *m_systemTrayTracker;
-    QXcbGlIntegration *m_glIntegration;
-    bool m_xiGrab;
+    QXcbSystemTrayTracker *m_systemTrayTracker = nullptr;
+    QXcbGlIntegration *m_glIntegration = nullptr;
+    bool m_xiGrab = false;
 
-    xcb_window_t m_qtSelectionOwner;
+    xcb_window_t m_qtSelectionOwner = 0;
 
     friend class QXcbEventReader;
 };
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index d91cbfe82d..acdcc996b7 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -52,14 +52,8 @@
 #include <X11/extensions/XI2proto.h>
 
 struct XInput2TouchDeviceData {
-    XInput2TouchDeviceData()
-    : xiDeviceInfo(0)
-    , qtTouchDevice(0)
-    , providesTouchOrientation(false)
-    {
-    }
-    XIDeviceInfo *xiDeviceInfo;
-    QTouchDevice *qtTouchDevice;
+    XIDeviceInfo *xiDeviceInfo = nullptr;
+    QTouchDevice *qtTouchDevice = nullptr;
     QHash<int, QWindowSystemInterface::TouchPoint> touchPoints;
     QHash<int, QPointF> pointPressedPosition; // in screen coordinates where each point was pressed
 
@@ -67,7 +61,7 @@ struct XInput2TouchDeviceData {
     QPointF firstPressedPosition;        // in screen coordinates where the first point was pressed
     QPointF firstPressedNormalPosition;  // device coordinates (0 to 1, 0 to 1) where the first point was pressed
     QSizeF size;                         // device size in mm
-    bool providesTouchOrientation;
+    bool providesTouchOrientation = false;
 };
 
 void QXcbConnection::initializeXInput2()
@@ -80,7 +74,7 @@ void QXcbConnection::initializeXInput2()
     Display *xDisplay = static_cast<Display *>(m_xlib_display);
     if (XQueryExtension(xDisplay, "XInputExtension", &m_xiOpCode, &m_xiEventBase, &m_xiErrorBase)) {
         int xiMajor = 2;
-        m_xi2Minor = 2; // try 2.2 first, needed for TouchBegin/Update/End
+        // try 2.2 first, needed for TouchBegin/Update/End
         if (XIQueryVersion(xDisplay, &xiMajor, &m_xi2Minor) == BadRequest) {
             m_xi2Minor = 1; // for smooth scrolling 2.1 is enough
             if (XIQueryVersion(xDisplay, &xiMajor, &m_xi2Minor) == BadRequest) {
diff --git a/src/plugins/platforms/xcb/qxcbkeyboard.cpp b/src/plugins/platforms/xcb/qxcbkeyboard.cpp
index a5aff7f11f..2e29c208c7 100644
--- a/src/plugins/platforms/xcb/qxcbkeyboard.cpp
+++ b/src/plugins/platforms/xcb/qxcbkeyboard.cpp
@@ -1136,12 +1136,6 @@ int QXcbKeyboard::keysymToQtKey(xcb_keysym_t keysym, Qt::KeyboardModifiers &modi
 
 QXcbKeyboard::QXcbKeyboard(QXcbConnection *connection)
     : QXcbObject(connection)
-    , m_autorepeat_code(0)
-    , xkb_context(0)
-    , xkb_keymap(0)
-    , xkb_state(0)
-    , latin_keymap(0)
-    , m_hasLatinLayout(false)
 {
     memset(&xkb_names, 0, sizeof(xkb_names));
 #if QT_CONFIG(xkb)
diff --git a/src/plugins/platforms/xcb/qxcbkeyboard.h b/src/plugins/platforms/xcb/qxcbkeyboard.h
index dfd2926435..74f9da0353 100644
--- a/src/plugins/platforms/xcb/qxcbkeyboard.h
+++ b/src/plugins/platforms/xcb/qxcbkeyboard.h
@@ -106,14 +106,14 @@ protected:
 private:
     void updateXKBStateFromState(struct xkb_state *kb_state, quint16 state);
 
-    bool m_config;
-    xcb_keycode_t m_autorepeat_code;
+    bool m_config = false;
+    xcb_keycode_t m_autorepeat_code = 0;
 
-    struct xkb_context *xkb_context;
-    struct xkb_keymap *xkb_keymap;
-    struct xkb_state *xkb_state;
+    struct xkb_context *xkb_context = nullptr;
+    struct xkb_keymap *xkb_keymap = nullptr;
+    struct xkb_state *xkb_state = nullptr;
     struct xkb_rule_names xkb_names;
-    mutable struct xkb_keymap *latin_keymap;
+    mutable struct xkb_keymap *latin_keymap = nullptr;
 
     struct _mod_masks {
         uint alt;
@@ -143,7 +143,7 @@ private:
     _mod_masks vmod_masks;
     int core_device_id;
 #endif
-    bool m_hasLatinLayout;
+    bool m_hasLatinLayout = false;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
index b1575cbee4..725288633a 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
@@ -90,8 +90,7 @@ static int resourceType(const QByteArray &key)
 }
 
 QXcbNativeInterface::QXcbNativeInterface() :
-    m_genericEventFilterType(QByteArrayLiteral("xcb_generic_event_t")),
-    m_sysTraySelectionAtom(XCB_ATOM_NONE)
+    m_genericEventFilterType(QByteArrayLiteral("xcb_generic_event_t"))
 {
 }
 
diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.h b/src/plugins/platforms/xcb/qxcbnativeinterface.h
index a830829311..4186d77f4d 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.h
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.h
@@ -129,7 +129,7 @@ private:
 
     const QByteArray m_genericEventFilterType;
 
-    xcb_atom_t m_sysTraySelectionAtom;
+    xcb_atom_t m_sysTraySelectionAtom = XCB_ATOM_NONE;
 
     static QXcbScreen *qPlatformScreenForWindow(QWindow *window);
 
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp
index a9675935f4..736b4852d8 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -59,7 +59,6 @@ QXcbVirtualDesktop::QXcbVirtualDesktop(QXcbConnection *connection, xcb_screen_t
     : QXcbObject(connection)
     , m_screen(screen)
     , m_number(number)
-    , m_xSettings(Q_NULLPTR)
 {
     const QByteArray cmAtomName =  "_NET_WM_CM_S" + QByteArray::number(m_number);
     m_net_wm_cm_atom = connection->internAtom(cmAtomName.constData());
@@ -175,20 +174,10 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, QXcbVirtualDesktop *virtualDe
     , m_virtualDesktop(virtualDesktop)
     , m_output(outputId)
     , m_crtc(output ? output->crtc : XCB_NONE)
-    , m_mode(XCB_NONE)
-    , m_primary(false)
-    , m_rotation(XCB_RANDR_ROTATION_ROTATE_0)
     , m_outputName(getOutputName(output))
     , m_outputSizeMillimeters(output ? QSize(output->mm_width, output->mm_height) : QSize())
     , m_virtualSize(virtualDesktop->size())
     , m_virtualSizeMillimeters(virtualDesktop->physicalSize())
-    , m_orientation(Qt::PrimaryOrientation)
-    , m_refreshRate(60)
-    , m_forcedDpi(-1)
-    , m_pixelDensity(1)
-    , m_hintStyle(QFontEngine::HintStyle(-1))
-    , m_subpixelType(QFontEngine::SubpixelAntialiasingType(-1))
-    , m_antialiasingEnabled(-1)
 {
     if (connection->hasXRandr()) {
         xcb_randr_select_input(xcb_connection(), screen()->root, true);
diff --git a/src/plugins/platforms/xcb/qxcbscreen.h b/src/plugins/platforms/xcb/qxcbscreen.h
index 627397fcaf..4163be2969 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.h
+++ b/src/plugins/platforms/xcb/qxcbscreen.h
@@ -95,12 +95,12 @@ private:
     QRect getWorkArea() const;
 
     xcb_screen_t *m_screen;
-    int m_number;
+    const int m_number;
     QList<QPlatformScreen *> m_screens;
 
-    QXcbXSettings *m_xSettings;
-    xcb_atom_t m_net_wm_cm_atom;
-    bool m_compositingActive;
+    QXcbXSettings *m_xSettings = nullptr;
+    xcb_atom_t m_net_wm_cm_atom = 0;
+    bool m_compositingActive = false;
 
     QRect m_workArea;
 };
@@ -186,9 +186,9 @@ private:
     QXcbVirtualDesktop *m_virtualDesktop;
     xcb_randr_output_t m_output;
     xcb_randr_crtc_t m_crtc;
-    xcb_randr_mode_t m_mode;
-    bool m_primary;
-    uint8_t m_rotation;
+    xcb_randr_mode_t m_mode = XCB_NONE;
+    bool m_primary = false;
+    uint8_t m_rotation = XCB_RANDR_ROTATION_ROTATE_0;
 
     QString m_outputName;
     QSizeF m_outputSizeMillimeters;
@@ -197,18 +197,18 @@ private:
     QRect m_availableGeometry;
     QSize m_virtualSize;
     QSizeF m_virtualSizeMillimeters;
-    Qt::ScreenOrientation m_orientation;
+    Qt::ScreenOrientation m_orientation = Qt::PrimaryOrientation;
     QString m_windowManagerName;
-    bool m_syncRequestSupported;
+    bool m_syncRequestSupported = false;
     QMap<xcb_visualid_t, xcb_visualtype_t> m_visuals;
     QMap<xcb_visualid_t, quint8> m_visualDepths;
     QXcbCursor *m_cursor;
-    int m_refreshRate;
-    int m_forcedDpi;
-    int m_pixelDensity;
-    QFontEngine::HintStyle m_hintStyle;
-    QFontEngine::SubpixelAntialiasingType m_subpixelType;
-    int m_antialiasingEnabled;
+    int m_refreshRate = 60;
+    int m_forcedDpi = -1;
+    int m_pixelDensity = 1;
+    QFontEngine::HintStyle m_hintStyle = QFontEngine::HintStyle(-1);
+    QFontEngine::SubpixelAntialiasingType m_subpixelType = QFontEngine::SubpixelAntialiasingType(-1);
+    int m_antialiasingEnabled = -1;
 };
 
 #ifndef QT_NO_DEBUG_STREAM
diff --git a/src/plugins/platforms/xcb/qxcbsystemtraytracker.cpp b/src/plugins/platforms/xcb/qxcbsystemtraytracker.cpp
index 5522af86de..fb0a4a3939 100644
--- a/src/plugins/platforms/xcb/qxcbsystemtraytracker.cpp
+++ b/src/plugins/platforms/xcb/qxcbsystemtraytracker.cpp
@@ -80,7 +80,6 @@ QXcbSystemTrayTracker::QXcbSystemTrayTracker(QXcbConnection *connection,
     , m_selection(selection)
     , m_trayAtom(trayAtom)
     , m_connection(connection)
-    , m_trayWindow(0)
 {
 }
 
diff --git a/src/plugins/platforms/xcb/qxcbsystemtraytracker.h b/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
index a6131e6d0e..a95b9374e9 100644
--- a/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
+++ b/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
@@ -77,7 +77,7 @@ private:
     const xcb_atom_t m_selection;
     const xcb_atom_t m_trayAtom;
     QXcbConnection *m_connection;
-    xcb_window_t m_trayWindow;
+    xcb_window_t m_trayWindow = 0;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 2d52f5dd46..756806108e 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -314,22 +314,6 @@ static const char *wm_window_role_property_id = "_q_xcb_wm_window_role";
 
 QXcbWindow::QXcbWindow(QWindow *window)
     : QPlatformWindow(window)
-    , m_window(0)
-    , m_cmap(0)
-    , m_syncCounter(0)
-    , m_gravity(XCB_GRAVITY_STATIC)
-    , m_mapped(false)
-    , m_transparent(false)
-    , m_usingSyncProtocol(false)
-    , m_deferredActivation(false)
-    , m_embedded(false)
-    , m_alertState(false)
-    , m_netWmUserTimeWindow(XCB_NONE)
-    , m_dirtyFrameMargins(false)
-    , m_lastWindowStateEvent(-1)
-    , m_syncState(NoSyncNeeded)
-    , m_pendingSyncRequest(0)
-    , m_currentBitmapCursor(XCB_CURSOR_NONE)
 {
     setConnection(xcbScreen()->connection());
 }
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index 680629c040..b4d947e700 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -233,48 +233,48 @@ protected:
     void handleLeaveNotifyEvent(int root_x, int root_y,
                                 quint8 mode, quint8 detail, xcb_timestamp_t timestamp);
 
-    xcb_window_t m_window;
-    xcb_colormap_t m_cmap;
+    xcb_window_t m_window = 0;
+    xcb_colormap_t m_cmap = 0;
 
-    uint m_depth;
-    QImage::Format m_imageFormat;
-    bool m_imageRgbSwap;
+    uint m_depth = 0;
+    QImage::Format m_imageFormat = QImage::Format_ARGB32_Premultiplied;
+    bool m_imageRgbSwap = false;
 
     xcb_sync_int64_t m_syncValue;
-    xcb_sync_counter_t m_syncCounter;
+    xcb_sync_counter_t m_syncCounter = 0;
 
-    Qt::WindowState m_windowState;
+    Qt::WindowState m_windowState = Qt::WindowNoState;
 
-    xcb_gravity_t m_gravity;
+    xcb_gravity_t m_gravity = XCB_GRAVITY_STATIC;
 
-    bool m_mapped;
-    bool m_transparent;
-    bool m_usingSyncProtocol;
-    bool m_deferredActivation;
-    bool m_embedded;
-    bool m_alertState;
-    xcb_window_t m_netWmUserTimeWindow;
+    bool m_mapped = false;
+    bool m_transparent = false;
+    bool m_usingSyncProtocol = false;
+    bool m_deferredActivation = false;
+    bool m_embedded = false;
+    bool m_alertState = false;
+    xcb_window_t m_netWmUserTimeWindow = XCB_NONE;
 
     QSurfaceFormat m_format;
 
-    mutable bool m_dirtyFrameMargins;
+    mutable bool m_dirtyFrameMargins = false;
     mutable QMargins m_frameMargins;
 
     QRegion m_exposeRegion;
     QSize m_oldWindowSize;
 
-    xcb_visualid_t m_visualId;
-    int m_lastWindowStateEvent;
+    xcb_visualid_t m_visualId = 0;
+    int m_lastWindowStateEvent = -1;
 
     enum SyncState {
         NoSyncNeeded,
         SyncReceived,
         SyncAndConfigureReceived
     };
-    SyncState m_syncState;
+    SyncState m_syncState = NoSyncNeeded;
 
-    QXcbSyncWindowRequest *m_pendingSyncRequest;
-    xcb_cursor_t m_currentBitmapCursor;
+    QXcbSyncWindowRequest *m_pendingSyncRequest = nullptr;
+    xcb_cursor_t m_currentBitmapCursor = XCB_CURSOR_NONE;
 };
 
 QT_END_NAMESPACE