Tidy nullptr usage

Move away from using 0 as pointer literal.

Done using clang-tidy. This is not complete as
run-clang-tidy can't handle all of qtbase in one go.

Change-Id: I1076a21f32aac0dab078af6f175f7508145eece0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

152 files changed, 1418 insertions, 1418 deletions

diff --git a/src/gui/accessible/qaccessible.cpp b/src/gui/accessible/qaccessible.cpp
index db47a3abc1..7922d6fb06 100644
--- a/src/gui/accessible/qaccessible.cpp
+++ b/src/gui/accessible/qaccessible.cpp
@@ -478,15 +478,15 @@ Q_GLOBAL_STATIC(QAccessiblePluginsHash, qAccessiblePlugins)
 Q_GLOBAL_STATIC(QList<QAccessible::InterfaceFactory>, qAccessibleFactories)
 Q_GLOBAL_STATIC(QList<QAccessible::ActivationObserver *>, qAccessibleActivationObservers)
 
-QAccessible::UpdateHandler QAccessible::updateHandler = 0;
-QAccessible::RootObjectHandler QAccessible::rootObjectHandler = 0;
+QAccessible::UpdateHandler QAccessible::updateHandler = nullptr;
+QAccessible::RootObjectHandler QAccessible::rootObjectHandler = nullptr;
 
 static bool cleanupAdded = false;
 
 static QPlatformAccessibility *platformAccessibility()
 {
     QPlatformIntegration *pfIntegration = QGuiApplicationPrivate::platformIntegration();
-    return pfIntegration ? pfIntegration->accessibility() : 0;
+    return pfIntegration ? pfIntegration->accessibility() : nullptr;
 }
 
 /*!
@@ -673,7 +673,7 @@ void QAccessible::removeActivationObserver(ActivationObserver *observer)
 QAccessibleInterface *QAccessible::queryAccessibleInterface(QObject *object)
 {
     if (!object)
-        return 0;
+        return nullptr;
 
     if (Id id = QAccessibleCache::instance()->objectToId.value(object))
         return QAccessibleCache::instance()->interfaceForId(id);
@@ -696,7 +696,7 @@ QAccessibleInterface *QAccessible::queryAccessibleInterface(QObject *object)
         // Find a QAccessiblePlugin (factory) for the class name. If there's
         // no entry in the cache try to create it using the plugin loader.
         if (!qAccessiblePlugins()->contains(cn)) {
-            QAccessiblePlugin *factory = 0; // 0 means "no plugin found". This is cached as well.
+            QAccessiblePlugin *factory = nullptr; // 0 means "no plugin found". This is cached as well.
             const int index = loader()->indexOf(cn);
             if (index != -1)
                 factory = qobject_cast<QAccessiblePlugin *>(loader()->instance(index));
@@ -724,7 +724,7 @@ QAccessibleInterface *QAccessible::queryAccessibleInterface(QObject *object)
         return appInterface;
     }
 
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -1113,7 +1113,7 @@ QAccessibleInterface::relations(QAccessible::Relation /*match = QAccessible::All
 */
 QAccessibleInterface *QAccessibleInterface::focusChild() const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -1758,12 +1758,12 @@ QAccessibleTextSelectionEvent::~QAccessibleTextSelectionEvent()
 */
 QAccessibleInterface *QAccessibleEvent::accessibleInterface() const
 {
-    if (m_object == 0)
+    if (m_object == nullptr)
         return QAccessible::accessibleInterface(m_uniqueId);
 
     QAccessibleInterface *iface = QAccessible::queryAccessibleInterface(m_object);
     if (!iface || !iface->isValid())
-        return 0;
+        return nullptr;
 
     if (m_child >= 0) {
         QAccessibleInterface *child = iface->child(m_child);
@@ -1791,7 +1791,7 @@ QAccessibleInterface *QAccessibleEvent::accessibleInterface() const
   */
 QWindow *QAccessibleInterface::window() const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/gui/accessible/qaccessibleobject.cpp b/src/gui/accessible/qaccessibleobject.cpp
index 2ef8502ad5..771cfda574 100644
--- a/src/gui/accessible/qaccessibleobject.cpp
+++ b/src/gui/accessible/qaccessibleobject.cpp
@@ -128,7 +128,7 @@ QAccessibleInterface *QAccessibleObject::childAt(int x, int y) const
         if (childIface->isValid() && childIface->rect().contains(x,y))
             return childIface;
     }
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -152,7 +152,7 @@ QWindow *QAccessibleApplication::window() const
 {
     // an application can have several windows, and AFAIK we don't need
     // to notify about changes on the application.
-    return 0;
+    return nullptr;
 }
 
 // all toplevel windows except popups and the desktop
@@ -190,7 +190,7 @@ int QAccessibleApplication::indexOfChild(const QAccessibleInterface *child) cons
 
 QAccessibleInterface *QAccessibleApplication::parent() const
 {
-    return 0;
+    return nullptr;
 }
 
 QAccessibleInterface *QAccessibleApplication::child(int index) const
@@ -198,7 +198,7 @@ QAccessibleInterface *QAccessibleApplication::child(int index) const
     const QObjectList tlo(topLevelObjects());
     if (index >= 0 && index < tlo.count())
         return QAccessible::queryAccessibleInterface(tlo.at(index));
-    return 0;
+    return nullptr;
 }
 
 
@@ -207,7 +207,7 @@ QAccessibleInterface *QAccessibleApplication::focusChild() const
 {
     if (QWindow *window = QGuiApplication::focusWindow())
         return window->accessibleRoot();
-    return 0;
+    return nullptr;
 }
 
 /*! \reimp */
diff --git a/src/gui/accessible/qplatformaccessibility.cpp b/src/gui/accessible/qplatformaccessibility.cpp
index 8c806d47b8..4813b83963 100644
--- a/src/gui/accessible/qplatformaccessibility.cpp
+++ b/src/gui/accessible/qplatformaccessibility.cpp
@@ -114,7 +114,7 @@ void QPlatformAccessibility::initialize()
     typedef PluginKeyMap::const_iterator PluginKeyMapConstIterator;
 
     const PluginKeyMap keyMap = bridgeloader()->keyMap();
-    QAccessibleBridgePlugin *factory = 0;
+    QAccessibleBridgePlugin *factory = nullptr;
     int i = -1;
     const PluginKeyMapConstIterator cend = keyMap.constEnd();
     for (PluginKeyMapConstIterator it = keyMap.constBegin(); it != cend; ++it) {
diff --git a/src/gui/animation/qguivariantanimation.cpp b/src/gui/animation/qguivariantanimation.cpp
index a5b6d8b95c..8afe77ed46 100644
--- a/src/gui/animation/qguivariantanimation.cpp
+++ b/src/gui/animation/qguivariantanimation.cpp
@@ -75,15 +75,15 @@ static void qUnregisterGuiGetInterpolator()
 {
     // casts required by Sun CC 5.5
     qRegisterAnimationInterpolator<QColor>(
-        (QVariant (*)(const QColor &, const QColor &, qreal))0);
+        (QVariant (*)(const QColor &, const QColor &, qreal))nullptr);
     qRegisterAnimationInterpolator<QVector2D>(
-        (QVariant (*)(const QVector2D &, const QVector2D &, qreal))0);
+        (QVariant (*)(const QVector2D &, const QVector2D &, qreal))nullptr);
     qRegisterAnimationInterpolator<QVector3D>(
-        (QVariant (*)(const QVector3D &, const QVector3D &, qreal))0);
+        (QVariant (*)(const QVector3D &, const QVector3D &, qreal))nullptr);
     qRegisterAnimationInterpolator<QVector4D>(
-        (QVariant (*)(const QVector4D &, const QVector4D &, qreal))0);
+        (QVariant (*)(const QVector4D &, const QVector4D &, qreal))nullptr);
     qRegisterAnimationInterpolator<QQuaternion>(
-        (QVariant (*)(const QQuaternion &, const QQuaternion &, qreal))0);
+        (QVariant (*)(const QQuaternion &, const QQuaternion &, qreal))nullptr);
 }
 Q_DESTRUCTOR_FUNCTION(qUnregisterGuiGetInterpolator)
 
diff --git a/src/gui/image/qbmphandler.cpp b/src/gui/image/qbmphandler.cpp
index 7f8e072322..32b6131309 100644
--- a/src/gui/image/qbmphandler.cpp
+++ b/src/gui/image/qbmphandler.cpp
@@ -414,7 +414,7 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, qint64 offset,
                                 *p++ = tmp >> 4;
                             }
                             if ((((c & 3) + 1) & 2) == 2)
-                                d->getChar(0);        // align on word boundary
+                                d->getChar(nullptr);        // align on word boundary
                             x += c;
                     }
                 } else {                        // encoded mode
@@ -494,7 +494,7 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, qint64 offset,
                             if (d->read((char *)p, b) != b)
                                 return false;
                             if ((b & 1) == 1)
-                                d->getChar(0);        // align on word boundary
+                                d->getChar(nullptr);        // align on word boundary
                             x += b;
                             p += b;
                     }
diff --git a/src/gui/image/qicon.cpp b/src/gui/image/qicon.cpp
index 84e387e317..19be066d23 100644
--- a/src/gui/image/qicon.cpp
+++ b/src/gui/image/qicon.cpp
@@ -132,7 +132,7 @@ static void qt_cleanup_icon_cache()
     if Qt::AA_UseHighDpiPixmaps is not set this function
     returns 1.0 to keep non-hihdpi aware code working.
 */
-static qreal qt_effective_device_pixel_ratio(QWindow *window = 0)
+static qreal qt_effective_device_pixel_ratio(QWindow *window = nullptr)
 {
     if (!qApp->testAttribute(Qt::AA_UseHighDpiPixmaps))
         return qreal(1.0);
@@ -228,7 +228,7 @@ static QPixmapIconEngineEntry *bestSizeMatch( const QSize &size, QPixmapIconEngi
 
 QPixmapIconEngineEntry *QPixmapIconEngine::tryMatch(const QSize &size, QIcon::Mode mode, QIcon::State state)
 {
-    QPixmapIconEngineEntry *pe = 0;
+    QPixmapIconEngineEntry *pe = nullptr;
     for (int i = 0; i < pixmaps.count(); ++i)
         if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) {
             if (pe)
@@ -674,7 +674,7 @@ QFactoryLoader *qt_iconEngineFactoryLoader()
   Constructs a null icon.
 */
 QIcon::QIcon() noexcept
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -682,7 +682,7 @@ QIcon::QIcon() noexcept
   Constructs an icon from a \a pixmap.
  */
 QIcon::QIcon(const QPixmap &pixmap)
-    :d(0)
+    :d(nullptr)
 {
     addPixmap(pixmap);
 }
@@ -723,7 +723,7 @@ QIcon::QIcon(const QIcon &other)
     complete list of the supported file formats.
 */
 QIcon::QIcon(const QString &fileName)
-    : d(0)
+    : d(nullptr)
 {
     addFile(fileName);
 }
@@ -838,7 +838,7 @@ QPixmap QIcon::pixmap(const QSize &size, Mode mode, State state) const
 {
     if (!d)
         return QPixmap();
-    return pixmap(0, size, mode, state);
+    return pixmap(nullptr, size, mode, state);
 }
 
 /*!
@@ -878,7 +878,7 @@ QSize QIcon::actualSize(const QSize &size, Mode mode, State state) const
 {
     if (!d)
         return QSize();
-    return actualSize(0, size, mode, state);
+    return actualSize(nullptr, size, mode, state);
 }
 
 /*!
@@ -1008,7 +1008,7 @@ void QIcon::detach()
         if (d->engine->isNull()) {
             if (!d->ref.deref())
                 delete d;
-            d = 0;
+            d = nullptr;
             return;
         } else if (d->ref.loadRelaxed() != 1) {
             QIconPrivate *x = new QIconPrivate(d->engine->clone());
diff --git a/src/gui/image/qiconloader.cpp b/src/gui/image/qiconloader.cpp
index 27c82bc09f..e67b387981 100644
--- a/src/gui/image/qiconloader.cpp
+++ b/src/gui/image/qiconloader.cpp
@@ -714,7 +714,7 @@ QIconLoaderEngineEntry *QIconLoaderEngine::entryForSize(const QThemeIconInfo &in
 
     // Find the minimum distance icon
     int minimalSize = INT_MAX;
-    QIconLoaderEngineEntry *closestMatch = 0;
+    QIconLoaderEngineEntry *closestMatch = nullptr;
     for (int i = 0; i < numEntries; ++i) {
         QIconLoaderEngineEntry *entry = info.entries.at(i);
         int distance = directorySizeDistance(entry->dir, iconsize, scale);
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index 869e206524..99d64737c5 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -73,7 +73,7 @@ QT_BEGIN_NAMESPACE
 
 static inline bool isLocked(QImageData *data)
 {
-    return data != 0 && data->is_locked;
+    return data != nullptr && data->is_locked;
 }
 
 #if defined(Q_CC_DEC) && defined(__alpha) && (__DECCXX_VER-0 >= 50190001)
@@ -99,15 +99,15 @@ static int next_qimage_serial_number()
 }
 
 QImageData::QImageData()
-    : ref(0), width(0), height(0), depth(0), nbytes(0), devicePixelRatio(1.0), data(0),
+    : ref(0), width(0), height(0), depth(0), nbytes(0), devicePixelRatio(1.0), data(nullptr),
       format(QImage::Format_ARGB32), bytes_per_line(0),
       ser_no(next_qimage_serial_number()),
       detach_no(0),
       dpmx(qt_defaultDpiX() * 100 / qreal(2.54)),
       dpmy(qt_defaultDpiY() * 100 / qreal(2.54)),
       offset(0, 0), own_data(true), ro_data(false), has_alpha_clut(false),
-      is_cached(false), is_locked(false), cleanupFunction(0), cleanupInfo(0),
-      paintEngine(0)
+      is_cached(false), is_locked(false), cleanupFunction(nullptr), cleanupInfo(nullptr),
+      paintEngine(nullptr)
 {
 }
 
@@ -170,7 +170,7 @@ QImageData::~QImageData()
     delete paintEngine;
     if (data && own_data)
         free(data);
-    data = 0;
+    data = nullptr;
 }
 
 #if defined(_M_ARM)
@@ -746,7 +746,7 @@ bool QImageData::checkForAlphaPixels() const
 QImage::QImage() noexcept
     : QPaintDevice()
 {
-    d = 0;
+    d = nullptr;
 }
 
 /*!
@@ -955,7 +955,7 @@ QImage::QImage(const uchar *data, int width, int height, int bytesPerLine, Forma
 QImage::QImage(const QString &fileName, const char *format)
     : QPaintDevice()
 {
-    d = 0;
+    d = nullptr;
     load(fileName, format);
 }
 
@@ -981,10 +981,10 @@ extern bool qt_read_xpm_image_or_array(QIODevice *device, const char * const *so
 QImage::QImage(const char * const xpm[])
     : QPaintDevice()
 {
-    d = 0;
+    d = nullptr;
     if (!xpm)
         return;
-    if (!qt_read_xpm_image_or_array(0, xpm, *this))
+    if (!qt_read_xpm_image_or_array(nullptr, xpm, *this))
         // Issue: Warning because the constructor may be ambigious
         qWarning("QImage::QImage(), XPM is not supported");
 }
@@ -1003,7 +1003,7 @@ QImage::QImage(const QImage &image)
     : QPaintDevice()
 {
     if (image.paintingActive() || isLocked(image.d)) {
-        d = 0;
+        d = nullptr;
         image.copy().swap(*this);
     } else {
         d = image.d;
@@ -1593,13 +1593,13 @@ void QImage::setColor(int i, QRgb c)
 uchar *QImage::scanLine(int i)
 {
     if (!d)
-        return 0;
+        return nullptr;
 
     detach();
 
     // In case detach() ran out of memory
     if (!d)
-        return 0;
+        return nullptr;
 
     return d->data + i * d->bytes_per_line;
 }
@@ -1610,7 +1610,7 @@ uchar *QImage::scanLine(int i)
 const uchar *QImage::scanLine(int i) const
 {
     if (!d)
-        return 0;
+        return nullptr;
 
     Q_ASSERT(i >= 0 && i < height());
     return d->data + i * d->bytes_per_line;
@@ -1633,7 +1633,7 @@ const uchar *QImage::scanLine(int i) const
 const uchar *QImage::constScanLine(int i) const
 {
     if (!d)
-        return 0;
+        return nullptr;
 
     Q_ASSERT(i >= 0 && i < height());
     return d->data + i * d->bytes_per_line;
@@ -1653,12 +1653,12 @@ const uchar *QImage::constScanLine(int i) const
 uchar *QImage::bits()
 {
     if (!d)
-        return 0;
+        return nullptr;
     detach();
 
     // In case detach ran out of memory...
     if (!d)
-        return 0;
+        return nullptr;
 
     return d->data;
 }
@@ -1672,7 +1672,7 @@ uchar *QImage::bits()
 */
 const uchar *QImage::bits() const
 {
-    return d ? d->data : 0;
+    return d ? d->data : nullptr;
 }
 
 
@@ -1688,7 +1688,7 @@ const uchar *QImage::bits() const
 */
 const uchar *QImage::constBits() const
 {
-    return d ? d->data : 0;
+    return d ? d->data : nullptr;
 }
 
 /*!
@@ -3027,11 +3027,11 @@ QImage QImage::createHeuristicMask(bool clipTight) const
     while(!done) {
         done = true;
         ypn = m.scanLine(0);
-        ypc = 0;
+        ypc = nullptr;
         for (y = 0; y < h; y++) {
             ypp = ypc;
             ypc = ypn;
-            ypn = (y == h-1) ? 0 : m.scanLine(y+1);
+            ypn = (y == h-1) ? nullptr : m.scanLine(y+1);
             const QRgb *p = (const QRgb *)scanLine(y);
             for (x = 0; x < w; x++) {
                 // slowness here - it's possible to do six of these tests
@@ -3053,11 +3053,11 @@ QImage QImage::createHeuristicMask(bool clipTight) const
 
     if (!clipTight) {
         ypn = m.scanLine(0);
-        ypc = 0;
+        ypc = nullptr;
         for (y = 0; y < h; y++) {
             ypp = ypc;
             ypc = ypn;
-            ypn = (y == h-1) ? 0 : m.scanLine(y+1);
+            ypn = (y == h-1) ? nullptr : m.scanLine(y+1);
             const QRgb *p = (const QRgb *)scanLine(y);
             for (x = 0; x < w; x++) {
                 if ((*p & 0x00ffffff) != background) {
@@ -4122,7 +4122,7 @@ void QImage::setText(const QString &key, const QString &value)
 QPaintEngine *QImage::paintEngine() const
 {
     if (!d)
-        return 0;
+        return nullptr;
 
     if (!d->paintEngine) {
         QPaintDevice *paintDevice = const_cast<QImage *>(this);
diff --git a/src/gui/image/qimage_conversions.cpp b/src/gui/image/qimage_conversions.cpp
index 8f33a13b95..27088698ec 100644
--- a/src/gui/image/qimage_conversions.cpp
+++ b/src/gui/image/qimage_conversions.cpp
@@ -198,7 +198,7 @@ void convert_generic(QImageData *dest, const QImageData *src, Qt::ImageConversio
             store = destLayout->storeFromRGB32;
     }
     QDitherInfo dither;
-    QDitherInfo *ditherPtr = 0;
+    QDitherInfo *ditherPtr = nullptr;
     if ((flags & Qt::PreferDither) && (flags & Qt::Dither_Mask) != Qt::ThresholdDither)
         ditherPtr = &dither;
 
@@ -212,8 +212,8 @@ void convert_generic(QImageData *dest, const QImageData *src, Qt::ImageConversio
                 buffer = reinterpret_cast<uint *>(destData) + x;
             else
                 l = qMin(l, BufferSize);
-            const uint *ptr = fetch(buffer, srcData, x, l, 0, ditherPtr);
-            store(destData, ptr, x, l, 0, ditherPtr);
+            const uint *ptr = fetch(buffer, srcData, x, l, nullptr, ditherPtr);
+            store(destData, ptr, x, l, nullptr, ditherPtr);
             x += l;
         }
         srcData += src->bytes_per_line;
@@ -314,7 +314,7 @@ bool convert_generic_inplace(QImageData *data, QImage::Format dst_format, Qt::Im
             store = destLayout->storeFromRGB32;
     }
     QDitherInfo dither;
-    QDitherInfo *ditherPtr = 0;
+    QDitherInfo *ditherPtr = nullptr;
     if ((flags & Qt::PreferDither) && (flags & Qt::Dither_Mask) != Qt::ThresholdDither)
         ditherPtr = &dither;
 
diff --git a/src/gui/image/qimageiohandler.cpp b/src/gui/image/qimageiohandler.cpp
index a4f927a462..0c9083a16e 100644
--- a/src/gui/image/qimageiohandler.cpp
+++ b/src/gui/image/qimageiohandler.cpp
@@ -288,7 +288,7 @@ public:
 
 QImageIOHandlerPrivate::QImageIOHandlerPrivate(QImageIOHandler *q)
 {
-    device = 0;
+    device = nullptr;
     q_ptr = q;
 }
 
diff --git a/src/gui/image/qimagereader.cpp b/src/gui/image/qimagereader.cpp
index dff24b449a..5e3b608d20 100644
--- a/src/gui/image/qimagereader.cpp
+++ b/src/gui/image/qimagereader.cpp
@@ -179,10 +179,10 @@ static QImageIOHandler *createReadHandlerHelper(QIODevice *device,
                                                 bool ignoresFormatAndExtension)
 {
     if (!autoDetectImageFormat && format.isEmpty())
-        return 0;
+        return nullptr;
 
     QByteArray form = format.toLower();
-    QImageIOHandler *handler = 0;
+    QImageIOHandler *handler = nullptr;
     QByteArray suffix;
 
 #ifndef QT_NO_IMAGEFORMATPLUGIN
@@ -450,7 +450,7 @@ static QImageIOHandler *createReadHandlerHelper(QIODevice *device,
         qDebug("QImageReader::createReadHandler: no handlers found. giving up.");
 #endif
         // no handler: give up.
-        return 0;
+        return nullptr;
     }
 
     handler->setDevice(device);
@@ -500,9 +500,9 @@ public:
 QImageReaderPrivate::QImageReaderPrivate(QImageReader *qq)
     : autoDetectImageFormat(true), ignoresFormatAndExtension(false)
 {
-    device = 0;
+    device = nullptr;
     deleteDevice = false;
-    handler = 0;
+    handler = nullptr;
     quality = -1;
     imageReaderError = QImageReader::UnknownError;
     autoTransform = UsePluginDefault;
@@ -571,7 +571,7 @@ bool QImageReaderPrivate::initHandler()
     }
 
     // assign a handler
-    if (!handler && (handler = createReadHandlerHelper(device, format, autoDetectImageFormat, ignoresFormatAndExtension)) == 0) {
+    if (!handler && (handler = createReadHandlerHelper(device, format, autoDetectImageFormat, ignoresFormatAndExtension)) == nullptr) {
         imageReaderError = QImageReader::UnsupportedFormatError;
         errorString = QImageReader::tr("Unsupported image format");
         return false;
diff --git a/src/gui/image/qimagereaderwriterhelpers.cpp b/src/gui/image/qimagereaderwriterhelpers.cpp
index a5b7fb6449..dd56d887a7 100644
--- a/src/gui/image/qimagereaderwriterhelpers.cpp
+++ b/src/gui/image/qimagereaderwriterhelpers.cpp
@@ -63,7 +63,7 @@ static void appendImagePluginFormats(QFactoryLoader *loader,
     const PluginKeyMap keyMap = loader->keyMap();
     const PluginKeyMapConstIterator cend = keyMap.constEnd();
     int i = -1;
-    QImageIOPlugin *plugin = 0;
+    QImageIOPlugin *plugin = nullptr;
     result->reserve(result->size() + keyMap.size());
     for (PluginKeyMapConstIterator it = keyMap.constBegin(); it != cend; ++it) {
         if (it.key() != i) {
@@ -71,7 +71,7 @@ static void appendImagePluginFormats(QFactoryLoader *loader,
             plugin = qobject_cast<QImageIOPlugin *>(loader->instance(i));
         }
         const QByteArray key = it.value().toLatin1();
-        if (plugin && (plugin->capabilities(0, key) & cap) != 0)
+        if (plugin && (plugin->capabilities(nullptr, key) & cap) != 0)
             result->append(key);
     }
 }
@@ -92,7 +92,7 @@ static void appendImagePluginMimeTypes(QFactoryLoader *loader,
         const int keyCount = keys.size();
         for (int k = 0; k < keyCount; ++k) {
             const QByteArray key = keys.at(k).toString().toLatin1();
-            if (plugin && (plugin->capabilities(0, key) & cap) != 0) {
+            if (plugin && (plugin->capabilities(nullptr, key) & cap) != 0) {
                 result->append(mimeTypes.at(k).toString().toLatin1());
                 if (resultKeys)
                     resultKeys->append(key);
diff --git a/src/gui/image/qimagewriter.cpp b/src/gui/image/qimagewriter.cpp
index ec66588ddf..9dcc955fe2 100644
--- a/src/gui/image/qimagewriter.cpp
+++ b/src/gui/image/qimagewriter.cpp
@@ -139,7 +139,7 @@ static QImageIOHandler *createWriteHandlerHelper(QIODevice *device,
 {
     QByteArray form = format.toLower();
     QByteArray suffix;
-    QImageIOHandler *handler = 0;
+    QImageIOHandler *handler = nullptr;
 
 #ifndef QT_NO_IMAGEFORMATPLUGIN
     typedef QMultiMap<int, QString> PluginKeyMap;
@@ -226,7 +226,7 @@ static QImageIOHandler *createWriteHandlerHelper(QIODevice *device,
 #endif // QT_NO_IMAGEFORMATPLUGIN
 
     if (!handler)
-        return 0;
+        return nullptr;
 
     handler->setDevice(device);
     if (!testFormat.isEmpty())
@@ -270,9 +270,9 @@ public:
 */
 QImageWriterPrivate::QImageWriterPrivate(QImageWriter *qq)
 {
-    device = 0;
+    device = nullptr;
     deleteDevice = false;
-    handler = 0;
+    handler = nullptr;
     quality = -1;
     compression = -1;
     gamma = 0.0;
@@ -304,7 +304,7 @@ bool QImageWriterPrivate::canWriteHelper()
         errorString = QImageWriter::tr("Device not writable");
         return false;
     }
-    if (!handler && (handler = createWriteHandlerHelper(device, format)) == 0) {
+    if (!handler && (handler = createWriteHandlerHelper(device, format)) == nullptr) {
         imageWriterError = QImageWriter::UnsupportedFormatError;
         errorString = QImageWriter::tr("Unsupported image format");
         return false;
@@ -403,7 +403,7 @@ void QImageWriter::setDevice(QIODevice *device)
     d->device = device;
     d->deleteDevice = false;
     delete d->handler;
-    d->handler = 0;
+    d->handler = nullptr;
 }
 
 /*!
@@ -823,7 +823,7 @@ QString QImageWriter::errorString() const
 */
 bool QImageWriter::supportsOption(QImageIOHandler::ImageOption option) const
 {
-    if (!d->handler && (d->handler = createWriteHandlerHelper(d->device, d->format)) == 0) {
+    if (!d->handler && (d->handler = createWriteHandlerHelper(d->device, d->format)) == nullptr) {
         d->imageWriterError = QImageWriter::UnsupportedFormatError;
         d->errorString = QImageWriter::tr("Unsupported image format");
         return false;
diff --git a/src/gui/image/qmovie.cpp b/src/gui/image/qmovie.cpp
index 25fce050a1..79019d0fdf 100644
--- a/src/gui/image/qmovie.cpp
+++ b/src/gui/image/qmovie.cpp
@@ -272,7 +272,7 @@ public:
 /*! \internal
  */
 QMoviePrivate::QMoviePrivate(QMovie *qq)
-    : reader(0), speed(100), movieState(QMovie::NotRunning),
+    : reader(nullptr), speed(100), movieState(QMovie::NotRunning),
       currentFrameNumber(-1), nextFrameNumber(0), greatestFrameNumber(-1),
       nextDelay(0), playCounter(-1),
       cacheMode(QMovie::CacheNone), haveReadAll(false), isFirstIteration(true)
diff --git a/src/gui/image/qpaintengine_pic.cpp b/src/gui/image/qpaintengine_pic.cpp
index 6a87a01a87..e89cac452a 100644
--- a/src/gui/image/qpaintengine_pic.cpp
+++ b/src/gui/image/qpaintengine_pic.cpp
@@ -73,14 +73,14 @@ QPicturePaintEngine::QPicturePaintEngine()
     : QPaintEngine(*(new QPicturePaintEnginePrivate), AllFeatures)
 {
     Q_D(QPicturePaintEngine);
-    d->pt = 0;
+    d->pt = nullptr;
 }
 
 QPicturePaintEngine::QPicturePaintEngine(QPaintEnginePrivate &dptr)
     : QPaintEngine(dptr, AllFeatures)
 {
     Q_D(QPicturePaintEngine);
-    d->pt = 0;
+    d->pt = nullptr;
 }
 
 QPicturePaintEngine::~QPicturePaintEngine()
@@ -484,7 +484,7 @@ void QPicturePaintEngine::drawTextItem(const QPointF &p , const QTextItem &ti)
 #endif
 
     const QTextItemInt &si = static_cast<const QTextItemInt &>(ti);
-    if (si.chars == 0)
+    if (si.chars == nullptr)
         QPaintEngine::drawTextItem(p, ti); // Draw as path
 
     if (d->pic_d->formatMajor >= 9) {
diff --git a/src/gui/image/qpicture.cpp b/src/gui/image/qpicture.cpp
index 978a07b9f9..3a32cc7f15 100644
--- a/src/gui/image/qpicture.cpp
+++ b/src/gui/image/qpicture.cpp
@@ -458,7 +458,7 @@ public:
     QFakeDevice() { dpi_x = qt_defaultDpiX(); dpi_y = qt_defaultDpiY(); }
     void setDpiX(int dpi) { dpi_x = dpi; }
     void setDpiY(int dpi) { dpi_y = dpi; }
-    QPaintEngine *paintEngine() const override { return 0; }
+    QPaintEngine *paintEngine() const override { return nullptr; }
     int metric(PaintDeviceMetric m) const override
     {
         switch(m) {
@@ -709,11 +709,11 @@ bool QPicture::exec(QPainter *painter, QDataStream &s, int nrecords)
 
                 QFontMetrics fm(fnt);
                 QPointF pt(p.x(), p.y() - fm.ascent());
-                qt_format_text(fnt, QRectF(pt, size), flags, /*opt*/0,
-                               str, /*brect=*/0, /*tabstops=*/0, /*...*/0, /*tabarraylen=*/0, painter);
+                qt_format_text(fnt, QRectF(pt, size), flags, /*opt*/nullptr,
+                               str, /*brect=*/nullptr, /*tabstops=*/0, /*...*/nullptr, /*tabarraylen=*/0, painter);
             } else {
-                qt_format_text(font, QRectF(p, QSizeF(1, 1)), Qt::TextSingleLine | Qt::TextDontClip, /*opt*/0,
-                               str, /*brect=*/0, /*tabstops=*/0, /*...*/0, /*tabarraylen=*/0, painter);
+                qt_format_text(font, QRectF(p, QSizeF(1, 1)), Qt::TextSingleLine | Qt::TextDontClip, /*opt*/nullptr,
+                               str, /*brect=*/nullptr, /*tabstops=*/0, /*...*/nullptr, /*tabarraylen=*/0, painter);
             }
 
             break;
@@ -1369,11 +1369,11 @@ QPictureIO::QPictureIO(const QString &fileName, const char* format)
 void QPictureIO::init()
 {
     d = new QPictureIOData();
-    d->parameters = 0;
+    d->parameters = nullptr;
     d->quality = -1; // default quality of the current format
     d->gamma=0.0f;
     d->iostat = 0;
-    d->iodev  = 0;
+    d->iodev  = nullptr;
 }
 
 /*!
@@ -1467,7 +1467,7 @@ static QPictureHandler *get_picture_handler(const char *format)
                 return list->at(i);
         }
     }
-    return 0;                                        // no such handler
+    return nullptr;                                        // no such handler
 }
 
 
@@ -1887,7 +1887,7 @@ bool QPictureIO::read()
         if (picture_format.isEmpty()) {
             if (file.isOpen()) {                        // unknown format
                 file.close();
-                d->iodev = 0;
+                d->iodev = nullptr;
             }
             return false;
         }
@@ -1913,7 +1913,7 @@ bool QPictureIO::read()
 
     if (file.isOpen()) {                        // picture was read using file
         file.close();
-        d->iodev = 0;
+        d->iodev = nullptr;
     }
     return d->iostat == 0;                                // picture successfully read?
 }
@@ -1957,7 +1957,7 @@ bool QPictureIO::write()
     (*h->write_picture)(this);
     if (file.isOpen()) {                        // picture was written using file
         file.close();
-        d->iodev = 0;
+        d->iodev = nullptr;
     }
     return d->iostat == 0;                                // picture successfully written?
 }
diff --git a/src/gui/image/qpixmap.cpp b/src/gui/image/qpixmap.cpp
index b6e41f16a5..3fce64cb20 100644
--- a/src/gui/image/qpixmap.cpp
+++ b/src/gui/image/qpixmap.cpp
@@ -94,7 +94,7 @@ void QPixmap::doInit(int w, int h, int type)
     if ((w > 0 && h > 0) || type == QPlatformPixmap::BitmapType)
         data = QPlatformPixmap::create(w, h, (QPlatformPixmap::PixelType) type);
     else
-        data = 0;
+        data = nullptr;
 }
 
 /*!
@@ -780,7 +780,7 @@ bool QPixmap::load(const QString &fileName, const char *format, Qt::ImageConvers
 
 bool QPixmap::loadFromData(const uchar *buf, uint len, const char *format, Qt::ImageConversionFlags flags)
 {
-    if (len == 0 || buf == 0) {
+    if (len == 0 || buf == nullptr) {
         data.reset();
         return false;
     }
@@ -1455,7 +1455,7 @@ int QPixmap::metric(PaintDeviceMetric metric) const
 */
 QPaintEngine *QPixmap::paintEngine() const
 {
-    return data ? data->paintEngine() : 0;
+    return data ? data->paintEngine() : nullptr;
 }
 
 /*!
diff --git a/src/gui/image/qpixmap_blitter.cpp b/src/gui/image/qpixmap_blitter.cpp
index 649a25250c..aeed1e3b34 100644
--- a/src/gui/image/qpixmap_blitter.cpp
+++ b/src/gui/image/qpixmap_blitter.cpp
@@ -92,8 +92,8 @@ void QBlittablePlatformPixmap::setBlittable(QBlittable *blittable)
 
 void QBlittablePlatformPixmap::resize(int width, int height)
 {
-    m_blittable.reset(0);
-    m_engine.reset(0);
+    m_blittable.reset(nullptr);
+    m_engine.reset(nullptr);
     d = QGuiApplication::primaryScreen()->depth();
     w = width;
     h = height;
@@ -145,8 +145,8 @@ void QBlittablePlatformPixmap::fill(const QColor &color)
         // if we could just change the format, e.g. when going from
         // RGB32 -> ARGB8888.
         if (color.alpha() != 255 && !hasAlphaChannel()) {
-            m_blittable.reset(0);
-            m_engine.reset(0);
+            m_blittable.reset(nullptr);
+            m_engine.reset(nullptr);
             m_alpha = true;
         }
 
diff --git a/src/gui/image/qpixmapcache.cpp b/src/gui/image/qpixmapcache.cpp
index 483d6d79a2..9709df9e0c 100644
--- a/src/gui/image/qpixmapcache.cpp
+++ b/src/gui/image/qpixmapcache.cpp
@@ -126,7 +126,7 @@ static inline bool qt_pixmapcache_thread_test()
 /*!
     Constructs an empty Key object.
 */
-QPixmapCache::Key::Key() : d(0)
+QPixmapCache::Key::Key() : d(nullptr)
 {
 }
 
@@ -259,9 +259,9 @@ uint qHash(const QPixmapCache::Key &k)
 }
 
 QPMCache::QPMCache()
-    : QObject(0),
+    : QObject(nullptr),
       QCache<QPixmapCache::Key, QPixmapCacheEntry>(cache_limit_default),
-      keyArray(0), theid(0), ps(0), keyArraySize(0), freeKey(0), t(false)
+      keyArray(nullptr), theid(0), ps(0), keyArraySize(0), freeKey(0), t(false)
 {
 }
 QPMCache::~QPMCache()
@@ -325,7 +325,7 @@ QPixmap *QPMCache::object(const QString &key) const
     QPixmapCache::Key cacheKey = cacheKeys.value(key);
     if (!cacheKey.d || !cacheKey.d->isValid) {
         const_cast<QPMCache *>(this)->cacheKeys.remove(key);
-        return 0;
+        return nullptr;
     }
     QPixmap *ptr = QCache<QPixmapCache::Key, QPixmapCacheEntry>::object(cacheKey);
      //We didn't find the pixmap in the cache, the key is not valid anymore
@@ -453,7 +453,7 @@ void QPMCache::releaseKey(const QPixmapCache::Key &key)
 void QPMCache::clear()
 {
     free(keyArray);
-    keyArray = 0;
+    keyArray = nullptr;
     freeKey = 0;
     keyArraySize = 0;
     //Mark all keys as invalid
@@ -539,7 +539,7 @@ bool QPixmapCache::find(const QString &key, QPixmap *pixmap)
     QPixmap *ptr = pm_cache()->object(key);
     if (ptr && pixmap)
         *pixmap = *ptr;
-    return ptr != 0;
+    return ptr != nullptr;
 }
 
 /*!
@@ -561,7 +561,7 @@ bool QPixmapCache::find(const Key &key, QPixmap *pixmap)
     QPixmap *ptr = pm_cache()->object(key);
     if (ptr && pixmap)
         *pixmap = *ptr;
-    return ptr != 0;
+    return ptr != nullptr;
 }
 
 /*!
diff --git a/src/gui/image/qplatformpixmap.cpp b/src/gui/image/qplatformpixmap.cpp
index a2e01147c4..493f55514e 100644
--- a/src/gui/image/qplatformpixmap.cpp
+++ b/src/gui/image/qplatformpixmap.cpp
@@ -266,7 +266,7 @@ QImage QPlatformPixmap::toImage(const QRect &rect) const
 
 QImage* QPlatformPixmap::buffer()
 {
-    return 0;
+    return nullptr;
 }
 
 
diff --git a/src/gui/image/qpnghandler.cpp b/src/gui/image/qpnghandler.cpp
index d6caf6773a..251f09fe52 100644
--- a/src/gui/image/qpnghandler.cpp
+++ b/src/gui/image/qpnghandler.cpp
@@ -109,7 +109,7 @@ public:
     };
 
     QPngHandlerPrivate(QPngHandler *qq)
-        : gamma(0.0), fileGamma(0.0), quality(50), compression(50), colorSpaceState(Undefined), png_ptr(0), info_ptr(0), end_info(0), state(Ready), q(qq)
+        : gamma(0.0), fileGamma(0.0), quality(50), compression(50), colorSpaceState(Undefined), png_ptr(nullptr), info_ptr(nullptr), end_info(nullptr), state(Ready), q(qq)
     { }
 
     float gamma;
@@ -134,18 +134,18 @@ public:
 
     struct AllocatedMemoryPointers {
         AllocatedMemoryPointers()
-            : row_pointers(0), accRow(0), inRow(0), outRow(0)
+            : row_pointers(nullptr), accRow(nullptr), inRow(nullptr), outRow(nullptr)
         { }
         void deallocate()
         {
             delete [] row_pointers;
-            row_pointers = 0;
+            row_pointers = nullptr;
             delete [] accRow;
-            accRow = 0;
+            accRow = nullptr;
             delete [] inRow;
-            inRow = 0;
+            inRow = nullptr;
             delete [] outRow;
-            outRow = 0;
+            outRow = nullptr;
         }
 
         png_byte **row_pointers;
@@ -245,13 +245,13 @@ void setup_qt(QImage& image, png_structp png_ptr, png_infop info_ptr, QSize scal
     png_uint_32 height = 0;
     int bit_depth = 0;
     int color_type = 0;
-    png_bytep trans_alpha = 0;
-    png_color_16p trans_color_p = 0;
+    png_bytep trans_alpha = nullptr;
+    png_color_16p trans_color_p = nullptr;
     int num_trans;
-    png_colorp palette = 0;
+    png_colorp palette = nullptr;
     int num_palette;
     int interlace_method = PNG_INTERLACE_LAST;
-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_method, 0, 0);
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_method, nullptr, nullptr);
     png_set_interlace_handling(png_ptr);
 
     if (color_type == PNG_COLOR_TYPE_GRAY) {
@@ -343,7 +343,7 @@ void setup_qt(QImage& image, png_structp png_ptr, png_infop info_ptr, QSize scal
         if (bit_depth != 1)
             png_set_packing(png_ptr);
         png_read_update_info(png_ptr, info_ptr);
-        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
+        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, nullptr, nullptr, nullptr);
         QImage::Format format = bit_depth == 1 ? QImage::Format_Mono : QImage::Format_Indexed8;
         if (image.size() != QSize(width, height) || image.format() != format) {
             image = QImage(width, height, format);
@@ -452,7 +452,7 @@ static void read_image_scaled(QImage *outImage, png_structp png_ptr, png_infop i
     int bit_depth = 0;
     int color_type = 0;
     int unit_type = PNG_OFFSET_PIXEL;
-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, nullptr, nullptr, nullptr);
     png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y, &unit_type);
     uchar *data = outImage->bits();
     int bpl = outImage->bytesPerLine();
@@ -478,7 +478,7 @@ static void read_image_scaled(QImage *outImage, png_structp png_ptr, png_infop i
             amp.accRow[i] = rval*amp.inRow[i];
         // Accumulate the next input rows
         for (rval = iysz-rval; rval > 0; rval-=oysz) {
-            png_read_row(png_ptr, amp.inRow, NULL);
+            png_read_row(png_ptr, amp.inRow, nullptr);
             quint32 fact = qMin(oysz, quint32(rval));
             for (quint32 i=0; i < ibw; i++)
                 amp.accRow[i] += fact*amp.inRow[i];
@@ -558,11 +558,11 @@ void QPngHandlerPrivate::readPngTexts(png_info *info)
 bool QPngHandlerPrivate::readPngHeader()
 {
     state = Error;
-    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,nullptr,nullptr,nullptr);
     if (!png_ptr)
         return false;
 
-    png_set_error_fn(png_ptr, 0, 0, qt_png_warning);
+    png_set_error_fn(png_ptr, nullptr, nullptr, qt_png_warning);
 
 #if defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_MAXIMUM_INFLATE_WINDOW)
     // Trade off a little bit of memory for better compatibility with existing images
@@ -572,21 +572,21 @@ bool QPngHandlerPrivate::readPngHeader()
 
     info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr) {
-        png_destroy_read_struct(&png_ptr, 0, 0);
-        png_ptr = 0;
+        png_destroy_read_struct(&png_ptr, nullptr, nullptr);
+        png_ptr = nullptr;
         return false;
     }
 
     end_info = png_create_info_struct(png_ptr);
     if (!end_info) {
-        png_destroy_read_struct(&png_ptr, &info_ptr, 0);
-        png_ptr = 0;
+        png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
+        png_ptr = nullptr;
         return false;
     }
 
     if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-        png_ptr = 0;
+        png_ptr = nullptr;
         return false;
     }
 
@@ -670,7 +670,7 @@ bool QPngHandlerPrivate::readPngImage(QImage *outImage)
 
     if (setjmp(png_jmpbuf(png_ptr))) {
         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-        png_ptr = 0;
+        png_ptr = nullptr;
         amp.deallocate();
         state = Error;
         return false;
@@ -689,7 +689,7 @@ bool QPngHandlerPrivate::readPngImage(QImage *outImage)
 
     if (outImage->isNull()) {
         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-        png_ptr = 0;
+        png_ptr = nullptr;
         amp.deallocate();
         state = Error;
         return false;
@@ -706,7 +706,7 @@ bool QPngHandlerPrivate::readPngImage(QImage *outImage)
         int bit_depth = 0;
         int color_type = 0;
         int unit_type = PNG_OFFSET_PIXEL;
-        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
+        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, nullptr, nullptr, nullptr);
         png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y, &unit_type);
         uchar *data = outImage->bits();
         int bpl = outImage->bytesPerLine();
@@ -747,7 +747,7 @@ bool QPngHandlerPrivate::readPngImage(QImage *outImage)
         outImage->setText(readTexts.at(i), readTexts.at(i+1));
 
     png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
-    png_ptr = 0;
+    png_ptr = nullptr;
     amp.deallocate();
     state = Ready;
 
@@ -767,7 +767,7 @@ QImage::Format QPngHandlerPrivate::readImageFormat()
         int bit_depth = 0, color_type = 0;
         png_colorp palette;
         int num_palette;
-        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
+        png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, nullptr, nullptr, nullptr);
         if (color_type == PNG_COLOR_TYPE_GRAY) {
             // Black & White or grayscale
             if (bit_depth == 1 && png_get_channels(png_ptr, info_ptr) == 1) {
@@ -910,16 +910,16 @@ bool QPNGImageWriter::writeImage(const QImage& image, int compression_in, const
     png_structp png_ptr;
     png_infop info_ptr;
 
-    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,0,0,0);
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,nullptr,nullptr,nullptr);
     if (!png_ptr) {
         return false;
     }
 
-    png_set_error_fn(png_ptr, 0, 0, qt_png_warning);
+    png_set_error_fn(png_ptr, nullptr, nullptr, qt_png_warning);
 
     info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr) {
-        png_destroy_write_struct(&png_ptr, 0);
+        png_destroy_write_struct(&png_ptr, nullptr);
         return false;
     }
 
@@ -1022,7 +1022,7 @@ bool QPNGImageWriter::writeImage(const QImage& image, int compression_in, const
         png_set_PLTE(png_ptr, info_ptr, palette, num_palette);
 
         if (num_trans) {
-            png_set_tRNS(png_ptr, info_ptr, trans, num_trans, 0);
+            png_set_tRNS(png_ptr, info_ptr, trans, num_trans, nullptr);
         }
     }
 
diff --git a/src/gui/image/qxpmhandler.cpp b/src/gui/image/qxpmhandler.cpp
index cf105b250a..f9424b62bb 100644
--- a/src/gui/image/qxpmhandler.cpp
+++ b/src/gui/image/qxpmhandler.cpp
@@ -1175,7 +1175,7 @@ QXpmHandler::QXpmHandler()
 bool QXpmHandler::readHeader()
 {
     state = Error;
-    if (!read_xpm_header(device(), 0, index, buffer, &cpp, &ncols, &width, &height))
+    if (!read_xpm_header(device(), nullptr, index, buffer, &cpp, &ncols, &width, &height))
         return false;
     state = ReadHeader;
     return true;
@@ -1191,7 +1191,7 @@ bool QXpmHandler::readImage(QImage *image)
         return false;
     }
 
-    if (!read_xpm_body(device(), 0, index, buffer, cpp, ncols, width, height, *image)) {
+    if (!read_xpm_body(device(), nullptr, index, buffer, cpp, ncols, width, height, *image)) {
         state = Error;
         return false;
     }
diff --git a/src/gui/itemmodels/qstandarditemmodel.cpp b/src/gui/itemmodels/qstandarditemmodel.cpp
index 2390c62b9f..2998808b54 100644
--- a/src/gui/itemmodels/qstandarditemmodel.cpp
+++ b/src/gui/itemmodels/qstandarditemmodel.cpp
@@ -130,7 +130,7 @@ void QStandardItemPrivate::setChild(int row, int column, QStandardItem *item,
     }
 
     if (item) {
-        if (item->d_func()->parent == 0) {
+        if (item->d_func()->parent == nullptr) {
             item->d_func()->setParentAndModel(q, model);
         } else {
             qWarning("QStandardItem::setChild: Ignoring duplicate insertion of item %p",
@@ -139,7 +139,7 @@ void QStandardItemPrivate::setChild(int row, int column, QStandardItem *item,
         }
     }
     if (oldItem)
-        oldItem->d_func()->setModel(0);
+        oldItem->d_func()->setModel(nullptr);
     delete oldItem;
     children.replace(index, item);
     if (item)
@@ -412,7 +412,7 @@ void QStandardItemPrivate::setModel(QStandardItemModel *mod)
 */
 QStandardItemModelPrivate::QStandardItemModelPrivate()
     : root(new QStandardItem),
-      itemPrototype(0),
+      itemPrototype(nullptr),
       sortRole(Qt::DisplayRole)
 {
     root->setFlags(Qt::ItemIsDropEnabled);
@@ -510,12 +510,12 @@ bool QStandardItemPrivate::insertRows(int row, int count, const QList<QStandardI
         for (int i = 0; i < limit; ++i) {
             QStandardItem *item = items.at(i);
             if (item) {
-                if (item->d_func()->parent == 0) {
+                if (item->d_func()->parent == nullptr) {
                     item->d_func()->setParentAndModel(q, model);
                 } else {
                     qWarning("QStandardItem::insertRows: Ignoring duplicate insertion of item %p",
                              item);
-                    item = 0;
+                    item = nullptr;
                 }
             }
             children.replace(index, item);
@@ -555,12 +555,12 @@ bool QStandardItemPrivate::insertColumns(int column, int count, const QList<QSta
         for (int i = 0; i < limit; ++i) {
             QStandardItem *item = items.at(i);
             if (item) {
-                if (item->d_func()->parent == 0) {
+                if (item->d_func()->parent == nullptr) {
                     item->d_func()->setParentAndModel(q, model);
                 } else {
                     qWarning("QStandardItem::insertColumns: Ignoring duplicate insertion of item %p",
                              item);
-                    item = 0;
+                    item = nullptr;
                 }
             }
             int r = i / count;
@@ -583,7 +583,7 @@ void QStandardItemModelPrivate::itemChanged(QStandardItem *item, const QVector<i
 {
     Q_Q(QStandardItemModel);
     Q_ASSERT(item);
-    if (item->d_func()->parent == 0) {
+    if (item->d_func()->parent == nullptr) {
         // Header item
         int idx = columnHeaderItems.indexOf(item);
         if (idx != -1) {
@@ -679,7 +679,7 @@ void QStandardItemModelPrivate::rowsRemoved(QStandardItem *parent,
         for (int i = row; i < row + count; ++i) {
             QStandardItem *oldItem = rowHeaderItems.at(i);
             if (oldItem)
-                oldItem->d_func()->setModel(0);
+                oldItem->d_func()->setModel(nullptr);
             delete oldItem;
         }
         rowHeaderItems.remove(row, count);
@@ -698,7 +698,7 @@ void QStandardItemModelPrivate::columnsRemoved(QStandardItem *parent,
         for (int i = column; i < column + count; ++i) {
             QStandardItem *oldItem = columnHeaderItems.at(i);
             if (oldItem)
-                oldItem->d_func()->setModel(0);
+                oldItem->d_func()->setModel(nullptr);
             delete oldItem;
         }
         columnHeaderItems.remove(column, count);
@@ -870,7 +870,7 @@ QStandardItem::~QStandardItem()
     Q_D(QStandardItem);
     for (QStandardItem *child : qAsConst(d->children)) {
         if (child)
-            child->d_func()->setModel(0);
+            child->d_func()->setModel(nullptr);
         delete child;
     }
     d->children.clear();
@@ -890,7 +890,7 @@ QStandardItem *QStandardItem::parent() const
     Q_D(const QStandardItem);
     if (!d->model || (d->model->d_func()->root.data() != d->parent))
         return d->parent;
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -1794,7 +1794,7 @@ void QStandardItem::removeRows(int row, int count)
     for (int j = i; j < n+i; ++j) {
         QStandardItem *oldItem = d->children.at(j);
         if (oldItem)
-            oldItem->d_func()->setModel(0);
+            oldItem->d_func()->setModel(nullptr);
         delete oldItem;
     }
     d->children.remove(qMax(i, 0), n);
@@ -1821,7 +1821,7 @@ void QStandardItem::removeColumns(int column, int count)
         for (int j=i; j<i+count; ++j) {
             QStandardItem *oldItem = d->children.at(j);
             if (oldItem)
-                oldItem->d_func()->setModel(0);
+                oldItem->d_func()->setModel(nullptr);
             delete oldItem;
         }
         d->children.remove(i, count);
@@ -1874,7 +1874,7 @@ QStandardItem *QStandardItem::child(int row, int column) const
     Q_D(const QStandardItem);
     int index = d->childIndex(row, column);
     if (index == -1)
-        return 0;
+        return nullptr;
     return d->children.at(index);
 }
 
@@ -1891,12 +1891,12 @@ QStandardItem *QStandardItem::child(int row, int column) const
 QStandardItem *QStandardItem::takeChild(int row, int column)
 {
     Q_D(QStandardItem);
-    QStandardItem *item = 0;
+    QStandardItem *item = nullptr;
     int index = d->childIndex(row, column);
     if (index != -1) {
         item = d->children.at(index);
         if (item)
-            item->d_func()->setParentAndModel(0, 0);
+            item->d_func()->setParentAndModel(nullptr, nullptr);
         d->children.replace(index, 0);
     }
     return item;
@@ -1925,7 +1925,7 @@ QList<QStandardItem*> QStandardItem::takeRow(int row)
         for (int column = 0; column < col_count; ++column) {
             QStandardItem *ch = d->children.at(index + column);
             if (ch)
-                ch->d_func()->setParentAndModel(0, 0);
+                ch->d_func()->setParentAndModel(nullptr, nullptr);
             items.append(ch);
         }
         d->children.remove(index, col_count);
@@ -1958,7 +1958,7 @@ QList<QStandardItem*> QStandardItem::takeColumn(int column)
         int index = d->childIndex(row, column);
         QStandardItem *ch = d->children.at(index);
         if (ch)
-            ch->d_func()->setParentAndModel(0, 0);
+            ch->d_func()->setParentAndModel(nullptr, nullptr);
         d->children.remove(index);
         items.prepend(ch);
     }
@@ -2291,13 +2291,13 @@ QStandardItem *QStandardItemModel::itemFromIndex(const QModelIndex &index) const
 {
     Q_D(const QStandardItemModel);
     if ((index.row() < 0) || (index.column() < 0) || (index.model() != this))
-        return 0;
+        return nullptr;
     QStandardItem *parent = static_cast<QStandardItem*>(index.internalPointer());
-    if (parent == 0)
-        return 0;
+    if (parent == nullptr)
+        return nullptr;
     QStandardItem *item = parent->child(index.row(), index.column());
     // lazy part
-    if (item == 0) {
+    if (item == nullptr) {
         item = d->createItem();
         parent->d_func()->setChild(index.row(), index.column(), item);
     }
@@ -2432,7 +2432,7 @@ void QStandardItemModel::setHorizontalHeaderItem(int column, QStandardItem *item
         return;
 
     if (item) {
-        if (item->model() == 0) {
+        if (item->model() == nullptr) {
             item->d_func()->setModel(this);
         } else {
             qWarning("QStandardItem::setHorizontalHeaderItem: Ignoring duplicate insertion of item %p",
@@ -2442,7 +2442,7 @@ void QStandardItemModel::setHorizontalHeaderItem(int column, QStandardItem *item
     }
 
     if (oldItem)
-        oldItem->d_func()->setModel(0);
+        oldItem->d_func()->setModel(nullptr);
     delete oldItem;
 
     d->columnHeaderItems.replace(column, item);
@@ -2461,7 +2461,7 @@ QStandardItem *QStandardItemModel::horizontalHeaderItem(int column) const
 {
     Q_D(const QStandardItemModel);
     if ((column < 0) || (column >= columnCount()))
-        return 0;
+        return nullptr;
     return d->columnHeaderItems.at(column);
 }
 
@@ -2488,7 +2488,7 @@ void QStandardItemModel::setVerticalHeaderItem(int row, QStandardItem *item)
         return;
 
     if (item) {
-        if (item->model() == 0) {
+        if (item->model() == nullptr) {
             item->d_func()->setModel(this);
         } else {
             qWarning("QStandardItem::setVerticalHeaderItem: Ignoring duplicate insertion of item %p",
@@ -2498,7 +2498,7 @@ void QStandardItemModel::setVerticalHeaderItem(int row, QStandardItem *item)
     }
 
     if (oldItem)
-        oldItem->d_func()->setModel(0);
+        oldItem->d_func()->setModel(nullptr);
     delete oldItem;
 
     d->rowHeaderItems.replace(row, item);
@@ -2517,7 +2517,7 @@ QStandardItem *QStandardItemModel::verticalHeaderItem(int row) const
 {
     Q_D(const QStandardItemModel);
     if ((row < 0) || (row >= rowCount()))
-        return 0;
+        return nullptr;
     return d->rowHeaderItems.at(row);
 }
 
@@ -2757,10 +2757,10 @@ QStandardItem *QStandardItemModel::takeHorizontalHeaderItem(int column)
 {
     Q_D(QStandardItemModel);
     if ((column < 0) || (column >= columnCount()))
-        return 0;
+        return nullptr;
     QStandardItem *headerItem = d->columnHeaderItems.at(column);
     if (headerItem) {
-        headerItem->d_func()->setParentAndModel(0, 0);
+        headerItem->d_func()->setParentAndModel(nullptr, nullptr);
         d->columnHeaderItems.replace(column, 0);
     }
     return headerItem;
@@ -2779,10 +2779,10 @@ QStandardItem *QStandardItemModel::takeVerticalHeaderItem(int row)
 {
     Q_D(QStandardItemModel);
     if ((row < 0) || (row >= rowCount()))
-        return 0;
+        return nullptr;
     QStandardItem *headerItem = d->rowHeaderItems.at(row);
     if (headerItem) {
-        headerItem->d_func()->setParentAndModel(0, 0);
+        headerItem->d_func()->setParentAndModel(nullptr, nullptr);
         d->rowHeaderItems.replace(row, 0);
     }
     return headerItem;
@@ -2876,7 +2876,7 @@ QVariant QStandardItemModel::headerData(int section, Qt::Orientation orientation
         || ((orientation == Qt::Vertical) && (section >= rowCount()))) {
         return QVariant();
     }
-    QStandardItem *headerItem = 0;
+    QStandardItem *headerItem = nullptr;
     if (orientation == Qt::Horizontal)
         headerItem = d->columnHeaderItems.at(section);
     else if (orientation == Qt::Vertical)
@@ -2902,7 +2902,7 @@ QModelIndex QStandardItemModel::index(int row, int column, const QModelIndex &pa
 {
     Q_D(const QStandardItemModel);
     QStandardItem *parentItem = d->itemFromIndex(parent);
-    if ((parentItem == 0)
+    if ((parentItem == nullptr)
         || (row < 0)
         || (column < 0)
         || (row >= parentItem->rowCount())
@@ -2919,7 +2919,7 @@ bool QStandardItemModel::insertColumns(int column, int count, const QModelIndex
 {
     Q_D(QStandardItemModel);
     QStandardItem *item = parent.isValid() ? itemFromIndex(parent) : d->root.data();
-    if (item == 0)
+    if (item == nullptr)
         return false;
     return item->d_func()->insertColumns(column, count, QList<QStandardItem*>());
 }
@@ -2931,7 +2931,7 @@ bool QStandardItemModel::insertRows(int row, int count, const QModelIndex &paren
 {
     Q_D(QStandardItemModel);
     QStandardItem *item = parent.isValid() ? itemFromIndex(parent) : d->root.data();
-    if (item == 0)
+    if (item == nullptr)
         return false;
     return item->d_func()->insertRows(row, count, QList<QStandardItem*>());
 }
@@ -2967,7 +2967,7 @@ bool QStandardItemModel::removeColumns(int column, int count, const QModelIndex
 {
     Q_D(QStandardItemModel);
     QStandardItem *item = d->itemFromIndex(parent);
-    if ((item == 0) || (count < 1) || (column < 0) || ((column + count) > item->columnCount()))
+    if ((item == nullptr) || (count < 1) || (column < 0) || ((column + count) > item->columnCount()))
         return false;
     item->removeColumns(column, count);
     return true;
@@ -2980,7 +2980,7 @@ bool QStandardItemModel::removeRows(int row, int count, const QModelIndex &paren
 {
     Q_D(QStandardItemModel);
     QStandardItem *item = d->itemFromIndex(parent);
-    if ((item == 0) || (count < 1) || (row < 0) || ((row + count) > item->rowCount()))
+    if ((item == nullptr) || (count < 1) || (row < 0) || ((row + count) > item->rowCount()))
         return false;
     item->removeRows(row, count);
     return true;
@@ -3004,7 +3004,7 @@ bool QStandardItemModel::setData(const QModelIndex &index, const QVariant &value
     if (!index.isValid())
         return false;
     QStandardItem *item = itemFromIndex(index);
-    if (item == 0)
+    if (item == nullptr)
         return false;
     item->setData(value, role);
     return true;
@@ -3047,17 +3047,17 @@ bool QStandardItemModel::setHeaderData(int section, Qt::Orientation orientation,
         || ((orientation == Qt::Vertical) && (section >= rowCount()))) {
         return false;
     }
-    QStandardItem *headerItem = 0;
+    QStandardItem *headerItem = nullptr;
     if (orientation == Qt::Horizontal) {
         headerItem = d->columnHeaderItems.at(section);
-        if (headerItem == 0) {
+        if (headerItem == nullptr) {
             headerItem = d->createItem();
             headerItem->d_func()->setModel(this);
             d->columnHeaderItems.replace(section, headerItem);
         }
     } else if (orientation == Qt::Vertical) {
         headerItem = d->rowHeaderItems.at(section);
-        if (headerItem == 0) {
+        if (headerItem == nullptr) {
             headerItem = d->createItem();
             headerItem->d_func()->setModel(this);
             d->rowHeaderItems.replace(section, headerItem);
@@ -3076,7 +3076,7 @@ bool QStandardItemModel::setHeaderData(int section, Qt::Orientation orientation,
 bool QStandardItemModel::setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles)
 {
     QStandardItem *item = itemFromIndex(index);
-    if (item == 0)
+    if (item == nullptr)
         return false;
     item->d_func()->setItemData(roles);
     return true;
@@ -3106,7 +3106,7 @@ QMimeData *QStandardItemModel::mimeData(const QModelIndexList &indexes) const
 {
     QMimeData *data = QAbstractItemModel::mimeData(indexes);
     if(!data)
-        return 0;
+        return nullptr;
 
     const QString format = qStandardItemModelDataListMimeType();
     if (!mimeTypes().contains(format))
@@ -3124,7 +3124,7 @@ QMimeData *QStandardItemModel::mimeData(const QModelIndexList &indexes) const
             stack.push(item);
         } else {
             qWarning("QStandardItemModel::mimeData: No item associated with invalid index");
-            return 0;
+            return nullptr;
         }
     }
 
diff --git a/src/gui/kernel/qclipboard.cpp b/src/gui/kernel/qclipboard.cpp
index 267c079ad9..db22ef2486 100644
--- a/src/gui/kernel/qclipboard.cpp
+++ b/src/gui/kernel/qclipboard.cpp
@@ -461,7 +461,7 @@ void QClipboard::setPixmap(const QPixmap &pixmap, Mode mode)
 const QMimeData* QClipboard::mimeData(Mode mode) const
 {
     QPlatformClipboard *clipboard = QGuiApplicationPrivate::platformIntegration()->clipboard();
-    if (!clipboard->supportsMode(mode)) return 0;
+    if (!clipboard->supportsMode(mode)) return nullptr;
     return clipboard->mimeData(mode);
 }
 
@@ -488,7 +488,7 @@ void QClipboard::setMimeData(QMimeData* src, Mode mode)
 {
     QPlatformClipboard *clipboard = QGuiApplicationPrivate::platformIntegration()->clipboard();
     if (!clipboard->supportsMode(mode)) {
-        if (src != 0) {
+        if (src != nullptr) {
             qDebug("Data set on unsupported clipboard mode. QMimeData object will be deleted.");
             src->deleteLater();
         }
@@ -512,7 +512,7 @@ void QClipboard::setMimeData(QMimeData* src, Mode mode)
 */
 void QClipboard::clear(Mode mode)
 {
-    setMimeData(0, mode);
+    setMimeData(nullptr, mode);
 }
 
 /*!
diff --git a/src/gui/kernel/qcursor.cpp b/src/gui/kernel/qcursor.cpp
index 1ba8760a9d..4ae5412367 100644
--- a/src/gui/kernel/qcursor.cpp
+++ b/src/gui/kernel/qcursor.cpp
@@ -384,7 +384,7 @@ QDataStream &operator>>(QDataStream &s, QCursor &c)
 */
 
 QCursor::QCursor(const QPixmap &pixmap, int hotX, int hotY)
-    : d(0)
+    : d(nullptr)
 {
     QImage img = pixmap.toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);
     QBitmap bm = QBitmap::fromImage(img, Qt::ThresholdDither|Qt::AvoidDither);
@@ -440,7 +440,7 @@ QCursor::QCursor(const QPixmap &pixmap, int hotX, int hotY)
 */
 
 QCursor::QCursor(const QBitmap &bitmap, const QBitmap &mask, int hotX, int hotY)
-    : d(0)
+    : d(nullptr)
 {
     d = QCursorData::setBitmap(bitmap, mask, hotX, hotY, 1.0);
 }
@@ -452,7 +452,7 @@ QCursor::QCursor()
 {
     if (!QCursorData::initialized) {
         if (QCoreApplication::startingUp()) {
-            d = 0;
+            d = nullptr;
             return;
         }
         QCursorData::initialize();
@@ -470,7 +470,7 @@ QCursor::QCursor()
     \sa setShape()
 */
 QCursor::QCursor(Qt::CursorShape shape)
-    : d(0)
+    : d(nullptr)
 {
     if (!QCursorData::initialized)
         QCursorData::initialize();
@@ -550,7 +550,7 @@ void QCursor::setShape(Qt::CursorShape shape)
 {
     if (!QCursorData::initialized)
         QCursorData::initialize();
-    QCursorData *c = uint(shape) <= Qt::LastCursor ? qt_cursorTable[shape] : 0;
+    QCursorData *c = uint(shape) <= Qt::LastCursor ? qt_cursorTable[shape] : nullptr;
     if (!c)
         c = qt_cursorTable[0];
     c->ref.ref();
@@ -675,7 +675,7 @@ QCursorData *qt_cursorTable[Qt::LastCursor + 1];
 bool QCursorData::initialized = false;
 
 QCursorData::QCursorData(Qt::CursorShape s)
-    : ref(1), cshape(s), bm(0), bmm(0), hx(0), hy(0)
+    : ref(1), cshape(s), bm(nullptr), bmm(nullptr), hx(0), hy(0)
 {
 }
 
@@ -695,7 +695,7 @@ void QCursorData::cleanup()
         // In case someone has a static QCursor defined with this shape
         if (!qt_cursorTable[shape]->ref.deref())
             delete qt_cursorTable[shape];
-        qt_cursorTable[shape] = 0;
+        qt_cursorTable[shape] = nullptr;
     }
     QCursorData::initialized = false;
 }
diff --git a/src/gui/kernel/qdnd.cpp b/src/gui/kernel/qdnd.cpp
index dd541af3b8..fe766c900e 100644
--- a/src/gui/kernel/qdnd.cpp
+++ b/src/gui/kernel/qdnd.cpp
@@ -48,19 +48,19 @@
 QT_BEGIN_NAMESPACE
 
 // the universe's only drag manager
-QDragManager *QDragManager::m_instance = 0;
+QDragManager *QDragManager::m_instance = nullptr;
 
 QDragManager::QDragManager()
-    : QObject(qApp), m_currentDropTarget(0),
+    : QObject(qApp), m_currentDropTarget(nullptr),
       m_platformDrag(QGuiApplicationPrivate::platformIntegration()->drag()),
-      m_object(0)
+      m_object(nullptr)
 {
     Q_ASSERT(!m_instance);
 }
 
 QDragManager::~QDragManager()
 {
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 QDragManager *QDragManager::self()
@@ -74,7 +74,7 @@ QObject *QDragManager::source() const
 {
     if (m_object)
         return m_object->source();
-    return 0;
+    return nullptr;
 }
 
 void QDragManager::setCurrentTarget(QObject *target, bool dropped)
@@ -111,7 +111,7 @@ Qt::DropAction QDragManager::drag(QDrag *o)
 
     m_object = o;
 
-    m_object->d_func()->target = 0;
+    m_object->d_func()->target = nullptr;
 
     QGuiApplicationPrivate::instance()->notifyDragStarted(m_object.data());
     const Qt::DropAction result = m_platformDrag->drag(m_object);
diff --git a/src/gui/kernel/qdrag.cpp b/src/gui/kernel/qdrag.cpp
index 8e2f7be23e..3712eace15 100644
--- a/src/gui/kernel/qdrag.cpp
+++ b/src/gui/kernel/qdrag.cpp
@@ -112,8 +112,8 @@ QDrag::QDrag(QObject *dragSource)
 {
     Q_D(QDrag);
     d->source = dragSource;
-    d->target = 0;
-    d->data = 0;
+    d->target = nullptr;
+    d->data = nullptr;
     d->hotspot = QPoint(-10, -10);
     d->executed_action = Qt::IgnoreAction;
     d->supported_actions = Qt::IgnoreAction;
@@ -138,7 +138,7 @@ void QDrag::setMimeData(QMimeData *data)
     Q_D(QDrag);
     if (d->data == data)
         return;
-    if (d->data != 0)
+    if (d->data != nullptr)
         delete d->data;
     d->data = data;
 }
diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp
index f555f4dc05..c69cc8ce6f 100644
--- a/src/gui/kernel/qevent.cpp
+++ b/src/gui/kernel/qevent.cpp
@@ -2950,7 +2950,7 @@ QObject* QDropEvent::source() const
 {
     if (const QDragManager *manager = QDragManager::self())
         return manager->source();
-    return 0;
+    return nullptr;
 }
 
 
@@ -4315,8 +4315,8 @@ QTouchEvent::QTouchEvent(QEvent::Type eventType,
                          Qt::TouchPointStates touchPointStates,
                          const QList<QTouchEvent::TouchPoint> &touchPoints)
     : QInputEvent(eventType, modifiers),
-      _window(0),
-      _target(0),
+      _window(nullptr),
+      _target(nullptr),
       _device(device),
       _touchPointStates(touchPointStates),
       _touchPoints(touchPoints)
@@ -5008,7 +5008,7 @@ void QTouchEvent::TouchPoint::setFlags(InfoFlags flags)
     The \a startPos is the position of a touch or mouse event that started the scrolling.
 */
 QScrollPrepareEvent::QScrollPrepareEvent(const QPointF &startPos)
-    : QEvent(QEvent::ScrollPrepare), m_target(0), m_startPos(startPos)
+    : QEvent(QEvent::ScrollPrepare), m_target(nullptr), m_startPos(startPos)
 {
     Q_UNUSED(m_target);
 }
diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index ef31e475ea..6a0b01b6c3 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -141,7 +141,7 @@ Qt::KeyboardModifiers QGuiApplicationPrivate::modifier_buttons = Qt::NoModifier;
 
 QPointF QGuiApplicationPrivate::lastCursorPosition(qInf(), qInf());
 
-QWindow *QGuiApplicationPrivate::currentMouseWindow = 0;
+QWindow *QGuiApplicationPrivate::currentMouseWindow = nullptr;
 
 QString QGuiApplicationPrivate::styleOverride;
 
@@ -155,8 +155,8 @@ QPointer<QWindow> QGuiApplicationPrivate::currentDragWindow;
 
 QVector<QGuiApplicationPrivate::TabletPointData> QGuiApplicationPrivate::tabletDevicePoints;
 
-QPlatformIntegration *QGuiApplicationPrivate::platform_integration = 0;
-QPlatformTheme *QGuiApplicationPrivate::platform_theme = 0;
+QPlatformIntegration *QGuiApplicationPrivate::platform_integration = nullptr;
+QPlatformTheme *QGuiApplicationPrivate::platform_theme = nullptr;
 
 QList<QObject *> QGuiApplicationPrivate::generic_plugin_list;
 
@@ -172,13 +172,13 @@ enum ApplicationResourceFlags
 
 static unsigned applicationResourceFlags = 0;
 
-QIcon *QGuiApplicationPrivate::app_icon = 0;
+QIcon *QGuiApplicationPrivate::app_icon = nullptr;
 
-QString *QGuiApplicationPrivate::platform_name = 0;
-QString *QGuiApplicationPrivate::displayName = 0;
-QString *QGuiApplicationPrivate::desktopFileName = 0;
+QString *QGuiApplicationPrivate::platform_name = nullptr;
+QString *QGuiApplicationPrivate::displayName = nullptr;
+QString *QGuiApplicationPrivate::desktopFileName = nullptr;
 
-QPalette *QGuiApplicationPrivate::app_pal = 0;        // default application palette
+QPalette *QGuiApplicationPrivate::app_pal = nullptr;        // default application palette
 
 ulong QGuiApplicationPrivate::mousePressTime = 0;
 Qt::MouseButton QGuiApplicationPrivate::mousePressButton = Qt::NoButton;
@@ -188,30 +188,30 @@ int QGuiApplicationPrivate::mousePressY = 0;
 static int mouseDoubleClickDistance = -1;
 static int touchDoubleTapDistance = -1;
 
-QWindow *QGuiApplicationPrivate::currentMousePressWindow = 0;
+QWindow *QGuiApplicationPrivate::currentMousePressWindow = nullptr;
 
 static Qt::LayoutDirection layout_direction = Qt::LayoutDirectionAuto;
 static bool force_reverse = false;
 
-QGuiApplicationPrivate *QGuiApplicationPrivate::self = 0;
-QTouchDevice *QGuiApplicationPrivate::m_fakeTouchDevice = 0;
+QGuiApplicationPrivate *QGuiApplicationPrivate::self = nullptr;
+QTouchDevice *QGuiApplicationPrivate::m_fakeTouchDevice = nullptr;
 int QGuiApplicationPrivate::m_fakeMouseSourcePointId = 0;
 
 #ifndef QT_NO_CLIPBOARD
-QClipboard *QGuiApplicationPrivate::qt_clipboard = 0;
+QClipboard *QGuiApplicationPrivate::qt_clipboard = nullptr;
 #endif
 
 QList<QScreen *> QGuiApplicationPrivate::screen_list;
 
 QWindowList QGuiApplicationPrivate::window_list;
-QWindow *QGuiApplicationPrivate::focus_window = 0;
+QWindow *QGuiApplicationPrivate::focus_window = nullptr;
 
 static QBasicMutex applicationFontMutex;
-QFont *QGuiApplicationPrivate::app_font = 0;
+QFont *QGuiApplicationPrivate::app_font = nullptr;
 QStyleHints *QGuiApplicationPrivate::styleHints = nullptr;
 bool QGuiApplicationPrivate::obey_desktop_settings = true;
 
-QInputDeviceManager *QGuiApplicationPrivate::m_inputDeviceManager = 0;
+QInputDeviceManager *QGuiApplicationPrivate::m_inputDeviceManager = nullptr;
 
 qreal QGuiApplicationPrivate::m_maxDevicePixelRatio = 0.0;
 
@@ -243,7 +243,7 @@ static void initPalette()
 static inline void clearPalette()
 {
     delete QGuiApplicationPrivate::app_pal;
-    QGuiApplicationPrivate::app_pal = 0;
+    QGuiApplicationPrivate::app_pal = nullptr;
 }
 
 static void initFontUnlocked()
@@ -261,7 +261,7 @@ static void initFontUnlocked()
 static inline void clearFontUnlocked()
 {
     delete QGuiApplicationPrivate::app_font;
-    QGuiApplicationPrivate::app_font = 0;
+    QGuiApplicationPrivate::app_font = nullptr;
 }
 
 static void initThemeHints()
@@ -656,16 +656,16 @@ QGuiApplication::~QGuiApplication()
     Q_D(QGuiApplication);
 
     d->eventDispatcher->closingDown();
-    d->eventDispatcher = 0;
+    d->eventDispatcher = nullptr;
 
 #ifndef QT_NO_CLIPBOARD
     delete QGuiApplicationPrivate::qt_clipboard;
-    QGuiApplicationPrivate::qt_clipboard = 0;
+    QGuiApplicationPrivate::qt_clipboard = nullptr;
 #endif
 
 #ifndef QT_NO_SESSIONMANAGER
     delete d->session_manager;
-    d->session_manager = 0;
+    d->session_manager = nullptr;
 #endif //QT_NO_SESSIONMANAGER
 
     clearPalette();
@@ -676,15 +676,15 @@ QGuiApplication::~QGuiApplication()
 #endif
 
     delete QGuiApplicationPrivate::app_icon;
-    QGuiApplicationPrivate::app_icon = 0;
+    QGuiApplicationPrivate::app_icon = nullptr;
     delete QGuiApplicationPrivate::platform_name;
-    QGuiApplicationPrivate::platform_name = 0;
+    QGuiApplicationPrivate::platform_name = nullptr;
     delete QGuiApplicationPrivate::displayName;
-    QGuiApplicationPrivate::displayName = 0;
+    QGuiApplicationPrivate::displayName = nullptr;
     delete QGuiApplicationPrivate::m_inputDeviceManager;
-    QGuiApplicationPrivate::m_inputDeviceManager = 0;
+    QGuiApplicationPrivate::m_inputDeviceManager = nullptr;
     delete QGuiApplicationPrivate::desktopFileName;
-    QGuiApplicationPrivate::desktopFileName = 0;
+    QGuiApplicationPrivate::desktopFileName = nullptr;
     QGuiApplicationPrivate::mouse_buttons = Qt::NoButton;
     QGuiApplicationPrivate::modifier_buttons = Qt::NoModifier;
     QGuiApplicationPrivate::lastCursorPosition = {qInf(), qInf()};
@@ -704,7 +704,7 @@ QGuiApplication::~QGuiApplication()
 
 QGuiApplicationPrivate::QGuiApplicationPrivate(int &argc, char **argv, int flags)
     : QCoreApplicationPrivate(argc, argv, flags),
-      inputMethod(0),
+      inputMethod(nullptr),
       lastTouchType(QEvent::TouchEnd),
       ownGlobalShareContext(false)
 {
@@ -797,7 +797,7 @@ QWindow *QGuiApplication::modalWindow()
 {
     CHECK_QAPP_INSTANCE(nullptr)
     if (QGuiApplicationPrivate::self->modalWindowList.isEmpty())
-        return 0;
+        return nullptr;
     return QGuiApplicationPrivate::self->modalWindowList.first();
 }
 
@@ -844,7 +844,7 @@ void QGuiApplicationPrivate::showModalWindow(QWindow *modal)
             self->modalWindowList.removeFirst();
             QEvent e(QEvent::Leave);
             QGuiApplication::sendEvent(currentMouseWindow, &e);
-            currentMouseWindow = 0;
+            currentMouseWindow = nullptr;
             self->modalWindowList.prepend(modal);
         }
     }
@@ -874,12 +874,12 @@ void QGuiApplicationPrivate::hideModalWindow(QWindow *window)
 */
 bool QGuiApplicationPrivate::isWindowBlocked(QWindow *window, QWindow **blockingWindow) const
 {
-    QWindow *unused = 0;
+    QWindow *unused = nullptr;
     if (!blockingWindow)
         blockingWindow = &unused;
 
     if (modalWindowList.isEmpty()) {
-        *blockingWindow = 0;
+        *blockingWindow = nullptr;
         return false;
     }
 
@@ -889,7 +889,7 @@ bool QGuiApplicationPrivate::isWindowBlocked(QWindow *window, QWindow **blocking
         // A window is not blocked by another modal window if the two are
         // the same, or if the window is a child of the modal window.
         if (window == modalWindow || modalWindow->isAncestorOf(window, QWindow::IncludeTransients)) {
-            *blockingWindow = 0;
+            *blockingWindow = nullptr;
             return false;
         }
 
@@ -930,7 +930,7 @@ bool QGuiApplicationPrivate::isWindowBlocked(QWindow *window, QWindow **blocking
             break;
         }
     }
-    *blockingWindow = 0;
+    *blockingWindow = nullptr;
     return false;
 }
 
@@ -969,7 +969,7 @@ QObject *QGuiApplication::focusObject()
 {
     if (focusWindow())
         return focusWindow()->focusObject();
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -1022,7 +1022,7 @@ QWindowList QGuiApplication::topLevelWindows()
 QScreen *QGuiApplication::primaryScreen()
 {
     if (QGuiApplicationPrivate::screen_list.isEmpty())
-        return 0;
+        return nullptr;
     return QGuiApplicationPrivate::screen_list.at(0);
 }
 
@@ -1450,7 +1450,7 @@ void QGuiApplicationPrivate::createPlatformIntegration()
     }
 
     if (j < argc) {
-        argv[j] = 0;
+        argv[j] = nullptr;
         argc = j;
     }
 
@@ -1470,7 +1470,7 @@ void QGuiApplicationPrivate::createEventDispatcher()
 {
     Q_ASSERT(!eventDispatcher);
 
-    if (platform_integration == 0)
+    if (platform_integration == nullptr)
         createPlatformIntegration();
 
     // The platform integration should not mess with the event dispatcher
@@ -1481,7 +1481,7 @@ void QGuiApplicationPrivate::createEventDispatcher()
 
 void QGuiApplicationPrivate::eventDispatcherReady()
 {
-    if (platform_integration == 0)
+    if (platform_integration == nullptr)
         createPlatformIntegration();
 
     platform_integration->initialize();
@@ -1578,7 +1578,7 @@ void QGuiApplicationPrivate::init()
     }
 
     if (j < argc) {
-        argv[j] = 0;
+        argv[j] = nullptr;
         argc = j;
     }
 
@@ -1587,7 +1587,7 @@ void QGuiApplicationPrivate::init()
     if (!envPlugins.isEmpty())
         pluginList += envPlugins.split(',');
 
-    if (platform_integration == 0)
+    if (platform_integration == nullptr)
         createPlatformIntegration();
 
     initPalette();
@@ -1693,16 +1693,16 @@ QGuiApplicationPrivate::~QGuiApplicationPrivate()
 #ifndef QT_NO_OPENGL
     if (ownGlobalShareContext) {
         delete qt_gl_global_share_context();
-        qt_gl_set_global_share_context(0);
+        qt_gl_set_global_share_context(nullptr);
     }
 #endif
 
     platform_integration->destroy();
 
     delete platform_theme;
-    platform_theme = 0;
+    platform_theme = nullptr;
     delete platform_integration;
-    platform_integration = 0;
+    platform_integration = nullptr;
 
     window_list.clear();
     screen_list.clear();
@@ -1793,7 +1793,7 @@ Qt::MouseButtons QGuiApplication::mouseButtons()
 QPlatformNativeInterface *QGuiApplication::platformNativeInterface()
 {
     QPlatformIntegration *pi = QGuiApplicationPrivate::platformIntegration();
-    return pi ? pi->nativeInterface() : 0;
+    return pi ? pi->nativeInterface() : nullptr;
 }
 
 /*!
@@ -2144,7 +2144,7 @@ void QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::Mo
                     window = currentMousePressWindow;
             } else if (currentMousePressWindow) {
                 window = currentMousePressWindow;
-                currentMousePressWindow = 0;
+                currentMousePressWindow = nullptr;
             }
             QPointF delta = globalPoint - globalPoint.toPoint();
             localPoint = window->mapFromGlobal(globalPoint.toPoint()) + delta;
@@ -2357,7 +2357,7 @@ void QGuiApplicationPrivate::processLeaveEvent(QWindowSystemInterfacePrivate::Le
         return;
     }
 
-    currentMouseWindow = 0;
+    currentMouseWindow = nullptr;
 
     QEvent event(QEvent::Leave);
     QCoreApplication::sendSpontaneousEvent(e->leave.data(), &event);
@@ -2376,7 +2376,7 @@ void QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate
             if (platformWindow->isAlertState())
                 platformWindow->setAlertState(false);
 
-    QObject *previousFocusObject = previous ? previous->focusObject() : 0;
+    QObject *previousFocusObject = previous ? previous->focusObject() : nullptr;
 
     if (previous) {
         QFocusEvent focusAboutToChange(QEvent::FocusAboutToChange);
@@ -2445,7 +2445,7 @@ void QGuiApplicationPrivate::processWindowScreenChangedEvent(QWindowSystemInterf
             if (QScreen *screen = wse->screen.data())
                 topLevelWindow->d_func()->setTopLevelScreen(screen, false /* recreate */);
             else // Fall back to default behavior, and try to find some appropriate screen
-                topLevelWindow->setScreen(0);
+                topLevelWindow->setScreen(nullptr);
         }
         // we may have changed scaling, so trigger resize event if needed
         if (window->handle()) {
@@ -2871,7 +2871,7 @@ void QGuiApplicationPrivate::processTouchEvent(QWindowSystemInterfacePrivate::To
             break;
         }
 
-        Q_ASSERT(w.data() != 0);
+        Q_ASSERT(w.data() != nullptr);
 
         // make the *scene* functions return the same as the *screen* functions
         // Note: touchPoint is a reference to the one from activeTouchPoints,
@@ -3247,12 +3247,12 @@ QPlatformDropQtResponse QGuiApplicationPrivate::processDrop(QWindow *w, const QM
 */
 QClipboard * QGuiApplication::clipboard()
 {
-    if (QGuiApplicationPrivate::qt_clipboard == 0) {
+    if (QGuiApplicationPrivate::qt_clipboard == nullptr) {
         if (!qApp) {
             qWarning("QGuiApplication: Must construct a QGuiApplication before accessing a QClipboard");
-            return 0;
+            return nullptr;
         }
-        QGuiApplicationPrivate::qt_clipboard = new QClipboard(0);
+        QGuiApplicationPrivate::qt_clipboard = new QClipboard(nullptr);
     }
     return QGuiApplicationPrivate::qt_clipboard;
 }
@@ -3873,7 +3873,7 @@ Qt::LayoutDirection QGuiApplication::layoutDirection()
 QCursor *QGuiApplication::overrideCursor()
 {
     CHECK_QAPP_INSTANCE(nullptr)
-    return qGuiApp->d_func()->cursor_list.isEmpty() ? 0 : &qGuiApp->d_func()->cursor_list.first();
+    return qGuiApp->d_func()->cursor_list.isEmpty() ? nullptr : &qGuiApp->d_func()->cursor_list.first();
 }
 
 /*!
@@ -3907,7 +3907,7 @@ static inline void unsetCursor(QWindow *w)
 {
     if (const QScreen *screen = w->screen())
         if (QPlatformCursor *cursor = screen->handle()->cursor())
-            cursor->changeCursor(0, w);
+            cursor->changeCursor(nullptr, w);
 }
 
 static inline void applyCursor(const QList<QWindow *> &l, const QCursor &c)
diff --git a/src/gui/kernel/qguivariant.cpp b/src/gui/kernel/qguivariant.cpp
index edca8d9423..4ed9d032f6 100644
--- a/src/gui/kernel/qguivariant.cpp
+++ b/src/gui/kernel/qguivariant.cpp
@@ -103,13 +103,13 @@ static void construct(QVariant::Private *x, const void *copy)
 {
     const int type = x->type;
     QVariantConstructor<GuiTypesFilter> constructor(x, copy);
-    QMetaTypeSwitcher::switcher<void>(constructor, type, 0);
+    QMetaTypeSwitcher::switcher<void>(constructor, type, nullptr);
 }
 
 static void clear(QVariant::Private *d)
 {
     QVariantDestructor<GuiTypesFilter> destructor(d);
-    QMetaTypeSwitcher::switcher<void>(destructor, d->type, 0);
+    QMetaTypeSwitcher::switcher<void>(destructor, d->type, nullptr);
 }
 
 // This class is a hack that customizes access to QPolygon and QPolygonF
@@ -129,7 +129,7 @@ public:
 static bool isNull(const QVariant::Private *d)
 {
     QGuiVariantIsNull<GuiTypesFilter> isNull(d);
-    return QMetaTypeSwitcher::switcher<bool>(isNull, d->type, 0);
+    return QMetaTypeSwitcher::switcher<bool>(isNull, d->type, nullptr);
 }
 
 // This class is a hack that customizes access to QPixmap, QBitmap, QCursor and QIcon
@@ -171,7 +171,7 @@ public:
 static bool compare(const QVariant::Private *a, const QVariant::Private *b)
 {
     QGuiVariantComparator<GuiTypesFilter> comparator(a, b);
-    return QMetaTypeSwitcher::switcher<bool>(comparator, a->type, 0);
+    return QMetaTypeSwitcher::switcher<bool>(comparator, a->type, nullptr);
 }
 
 static bool convert(const QVariant::Private *d, int t,
@@ -311,7 +311,7 @@ static void streamDebug(QDebug dbg, const QVariant &v)
 {
     QVariant::Private *d = const_cast<QVariant::Private *>(&v.data_ptr());
     QVariantDebugStream<GuiTypesFilter> stream(dbg, d);
-    QMetaTypeSwitcher::switcher<void>(stream, d->type, 0);
+    QMetaTypeSwitcher::switcher<void>(stream, d->type, nullptr);
 }
 #endif
 
@@ -320,12 +320,12 @@ const QVariant::Handler qt_gui_variant_handler = {
     clear,
     isNull,
 #ifndef QT_NO_DATASTREAM
-    0,
-    0,
+    nullptr,
+    nullptr,
 #endif
     compare,
     convert,
-    0,
+    nullptr,
 #if !defined(QT_NO_DEBUG_STREAM)
     streamDebug
 #else
diff --git a/src/gui/kernel/qkeymapper.cpp b/src/gui/kernel/qkeymapper.cpp
index 4893b1d57b..274574f561 100644
--- a/src/gui/kernel/qkeymapper.cpp
+++ b/src/gui/kernel/qkeymapper.cpp
@@ -60,7 +60,7 @@ QT_BEGIN_NAMESPACE
     Constructs a new key mapper.
 */
 QKeyMapper::QKeyMapper()
-    : QObject(*new QKeyMapperPrivate, 0)
+    : QObject(*new QKeyMapperPrivate, nullptr)
 {
 }
 
diff --git a/src/gui/kernel/qoffscreensurface.cpp b/src/gui/kernel/qoffscreensurface.cpp
index 0cc11ca3bb..c74fe0b3a1 100644
--- a/src/gui/kernel/qoffscreensurface.cpp
+++ b/src/gui/kernel/qoffscreensurface.cpp
@@ -99,10 +99,10 @@ public:
     QOffscreenSurfacePrivate()
         : QObjectPrivate()
         , surfaceType(QSurface::OpenGLSurface)
-        , platformOffscreenSurface(0)
-        , offscreenWindow(0)
+        , platformOffscreenSurface(nullptr)
+        , offscreenWindow(nullptr)
         , requestedFormat(QSurfaceFormat::defaultFormat())
-        , screen(0)
+        , screen(nullptr)
         , size(1, 1)
         , nativeHandle(nullptr)
     {
@@ -235,11 +235,11 @@ void QOffscreenSurface::destroy()
     QGuiApplication::sendEvent(this, &e);
 
     delete d->platformOffscreenSurface;
-    d->platformOffscreenSurface = 0;
+    d->platformOffscreenSurface = nullptr;
     if (d->offscreenWindow) {
         d->offscreenWindow->destroy();
         delete d->offscreenWindow;
-        d->offscreenWindow = 0;
+        d->offscreenWindow = nullptr;
     }
 
     d->nativeHandle = nullptr;
@@ -341,7 +341,7 @@ void QOffscreenSurface::setScreen(QScreen *newScreen)
     if (!newScreen)
         newScreen = QCoreApplication::instance() ? QGuiApplication::primaryScreen() : nullptr;
     if (newScreen != d->screen) {
-        const bool wasCreated = d->platformOffscreenSurface != 0 || d->offscreenWindow != 0;
+        const bool wasCreated = d->platformOffscreenSurface != nullptr || d->offscreenWindow != nullptr;
         if (wasCreated)
             destroy();
         if (d->screen)
@@ -385,7 +385,7 @@ void QOffscreenSurface::screenDestroyed(QObject *object)
 {
     Q_D(QOffscreenSurface);
     if (object == static_cast<QObject *>(d->screen))
-        setScreen(0);
+        setScreen(nullptr);
 }
 
 /*!
diff --git a/src/gui/kernel/qopenglcontext.cpp b/src/gui/kernel/qopenglcontext.cpp
index 638eb1d12f..124b39f2a9 100644
--- a/src/gui/kernel/qopenglcontext.cpp
+++ b/src/gui/kernel/qopenglcontext.cpp
@@ -223,7 +223,7 @@ class QGuiGLThreadContext
 {
 public:
     QGuiGLThreadContext()
-        : context(0)
+        : context(nullptr)
     {
     }
     ~QGuiGLThreadContext() {
@@ -234,7 +234,7 @@ public:
 };
 
 Q_GLOBAL_STATIC(QThreadStorage<QGuiGLThreadContext *>, qwindow_context_storage);
-static QOpenGLContext *global_share_context = 0;
+static QOpenGLContext *global_share_context = nullptr;
 
 #ifndef QT_NO_DEBUG
 QHash<QOpenGLContext *, bool> QOpenGLContextPrivate::makeCurrentTracker;
@@ -347,7 +347,7 @@ QOpenGLContext *QOpenGLContextPrivate::setCurrentContext(QOpenGLContext *context
     if (!threadContext) {
         if (!QThread::currentThread()) {
             qWarning("No QTLS available. currentContext won't work");
-            return 0;
+            return nullptr;
         }
         threadContext = new QGuiGLThreadContext;
         qwindow_context_storage()->setLocalData(threadContext);
@@ -372,10 +372,10 @@ int QOpenGLContextPrivate::maxTextureSize()
 
         GLint size;
         GLint next = 64;
-        funcs->glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+        funcs->glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
 
-        QOpenGLFunctions_1_0 *gl1funcs = 0;
-        QOpenGLFunctions_3_2_Core *gl3funcs = 0;
+        QOpenGLFunctions_1_0 *gl1funcs = nullptr;
+        QOpenGLFunctions_3_2_Core *gl3funcs = nullptr;
 
         if (q->format().profile() == QSurfaceFormat::CoreProfile)
             gl3funcs = q->versionFunctions<QOpenGLFunctions_3_2_Core>();
@@ -398,7 +398,7 @@ int QOpenGLContextPrivate::maxTextureSize()
 
             if (next > max_texture_size)
                 break;
-            funcs->glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+            funcs->glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
             if (gl1funcs)
                 gl1funcs->glGetTexLevelParameteriv(proxy, 0, GL_TEXTURE_WIDTH, &next);
             else
@@ -455,7 +455,7 @@ QPlatformOpenGLContext *QOpenGLContext::shareHandle() const
     Q_D(const QOpenGLContext);
     if (d->shareContext)
         return d->shareContext->handle();
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -517,8 +517,8 @@ void QOpenGLContextPrivate::_q_screenDestroyed(QObject *object)
 {
     Q_Q(QOpenGLContext);
     if (object == static_cast<QObject *>(screen)) {
-        screen = 0;
-        q->setScreen(0);
+        screen = nullptr;
+        q->setScreen(nullptr);
     }
 }
 
@@ -615,7 +615,7 @@ bool QOpenGLContext::create()
     d->platformGLContext->setContext(this);
     d->platformGLContext->initialize();
     if (!d->platformGLContext->isSharing())
-        d->shareContext = 0;
+        d->shareContext = nullptr;
     d->shareGroup = d->shareContext ? d->shareContext->shareGroup() : new QOpenGLContextGroup;
     d->shareGroup->d_func()->addContext(this);
     return isValid();
@@ -649,15 +649,15 @@ void QOpenGLContext::destroy()
         doneCurrent();
     if (d->shareGroup)
         d->shareGroup->d_func()->removeContext(this);
-    d->shareGroup = 0;
+    d->shareGroup = nullptr;
     delete d->platformGLContext;
-    d->platformGLContext = 0;
+    d->platformGLContext = nullptr;
     delete d->functions;
-    d->functions = 0;
+    d->functions = nullptr;
 
     for (QAbstractOpenGLFunctions *func : qAsConst(d->externalVersionFunctions)) {
         QAbstractOpenGLFunctionsPrivate *func_d = QAbstractOpenGLFunctionsPrivate::get(func);
-        func_d->owningContext = 0;
+        func_d->owningContext = nullptr;
         func_d->initialized = false;
     }
     d->externalVersionFunctions.clear();
@@ -665,7 +665,7 @@ void QOpenGLContext::destroy()
     d->versionFunctions.clear();
 
     delete d->textureFunctions;
-    d->textureFunctions = 0;
+    d->textureFunctions = nullptr;
 
     d->nativeHandle = QVariant();
 }
@@ -823,7 +823,7 @@ QAbstractOpenGLFunctions *QOpenGLContext::versionFunctions(const QOpenGLVersionP
 #ifndef QT_OPENGL_ES_2
     if (isOpenGLES()) {
         qWarning("versionFunctions: Not supported on OpenGL ES");
-        return 0;
+        return nullptr;
     }
 #endif // QT_OPENGL_ES_2
 
@@ -838,16 +838,16 @@ QAbstractOpenGLFunctions *QOpenGLContext::versionFunctions(const QOpenGLVersionP
     // Check that context is compatible with requested version
     const QPair<int, int> v = qMakePair(f.majorVersion(), f.minorVersion());
     if (v < vp.version())
-        return 0;
+        return nullptr;
 
     // If this context only offers core profile functions then we can't create
     // function objects for legacy or compatibility profile requests
     if (((vp.hasProfiles() && vp.profile() != QSurfaceFormat::CoreProfile) || vp.isLegacyVersion())
         && f.profile() == QSurfaceFormat::CoreProfile)
-        return 0;
+        return nullptr;
 
     // Create object if suitable one not cached
-    QAbstractOpenGLFunctions* funcs = 0;
+    QAbstractOpenGLFunctions* funcs = nullptr;
     auto it = d->versionFunctions.constFind(vp);
     if (it == d->versionFunctions.constEnd()) {
         funcs = QOpenGLVersionFunctionsFactory::create(vp);
@@ -1022,7 +1022,7 @@ bool QOpenGLContext::makeCurrent(QSurface *surface)
                         || qstrncmp(rendererString, "Adreno 6xx", 8) == 0 // Same as above but without the '(TM)'
                         || qstrcmp(rendererString, "GC800 core") == 0
                         || qstrcmp(rendererString, "GC1000 core") == 0
-                        || strstr(rendererString, "GC2000") != 0
+                        || strstr(rendererString, "GC2000") != nullptr
                         || qstrcmp(rendererString, "Immersion.16") == 0;
         }
         needsWorkaroundSet = true;
@@ -1053,9 +1053,9 @@ void QOpenGLContext::doneCurrent()
         d->shareGroup->d_func()->deletePendingResources(this);
 
     d->platformGLContext->doneCurrent();
-    QOpenGLContextPrivate::setCurrentContext(0);
+    QOpenGLContextPrivate::setCurrentContext(nullptr);
 
-    d->surface = 0;
+    d->surface = nullptr;
 }
 
 /*!
@@ -1224,8 +1224,8 @@ void QOpenGLContext::deleteQGLContext()
     Q_D(QOpenGLContext);
     if (d->qGLContextDeleteFunction && d->qGLContextHandle) {
         d->qGLContextDeleteFunction(d->qGLContextHandle);
-        d->qGLContextDeleteFunction = 0;
-        d->qGLContextHandle = 0;
+        d->qGLContextDeleteFunction = nullptr;
+        d->qGLContextHandle = nullptr;
     }
 }
 
@@ -1252,7 +1252,7 @@ void *QOpenGLContext::openGLModuleHandle()
     Q_ASSERT(ni);
     return ni->nativeResourceForIntegration(QByteArrayLiteral("glhandle"));
 #else
-    return 0;
+    return nullptr;
 #endif
 }
 
@@ -1438,7 +1438,7 @@ QList<QOpenGLContext *> QOpenGLContextGroup::shares() const
 QOpenGLContextGroup *QOpenGLContextGroup::currentContextGroup()
 {
     QOpenGLContext *current = QOpenGLContext::currentContext();
-    return current ? current->shareGroup() : 0;
+    return current ? current->shareGroup() : nullptr;
 }
 
 void QOpenGLContextGroupPrivate::addContext(QOpenGLContext *ctx)
@@ -1491,7 +1491,7 @@ void QOpenGLContextGroupPrivate::cleanup()
 
     while (it != end) {
         (*it)->invalidateResource();
-        (*it)->m_group = 0;
+        (*it)->m_group = nullptr;
         ++it;
     }
 
diff --git a/src/gui/kernel/qopenglwindow.cpp b/src/gui/kernel/qopenglwindow.cpp
index 022a47c919..2ea8f43711 100644
--- a/src/gui/kernel/qopenglwindow.cpp
+++ b/src/gui/kernel/qopenglwindow.cpp
@@ -208,8 +208,8 @@ QOpenGLWindowPrivate::~QOpenGLWindowPrivate()
     Q_Q(QOpenGLWindow);
     if (q->isValid()) {
         q->makeCurrent(); // this works even when the platformwindow is destroyed
-        paintDevice.reset(0);
-        fbo.reset(0);
+        paintDevice.reset(nullptr);
+        fbo.reset(nullptr);
         blitter.destroy();
         q->doneCurrent();
     }
@@ -692,7 +692,7 @@ QPaintDevice *QOpenGLWindow::redirected(QPoint *) const
     Q_D(const QOpenGLWindow);
     if (QOpenGLContext::currentContext() == d->context.data())
         return d->paintDevice.data();
-    return 0;
+    return nullptr;
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qpaintdevicewindow.cpp b/src/gui/kernel/qpaintdevicewindow.cpp
index 4521c2f62c..4f45fc5fde 100644
--- a/src/gui/kernel/qpaintdevicewindow.cpp
+++ b/src/gui/kernel/qpaintdevicewindow.cpp
@@ -219,7 +219,7 @@ QPaintDeviceWindow::QPaintDeviceWindow(QPaintDeviceWindowPrivate &dd, QWindow *p
  */
 QPaintEngine *QPaintDeviceWindow::paintEngine() const
 {
-    return 0;
+    return nullptr;
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/kernel/qpalette.cpp b/src/gui/kernel/qpalette.cpp
index 61dccd77ac..fc063bc72c 100644
--- a/src/gui/kernel/qpalette.cpp
+++ b/src/gui/kernel/qpalette.cpp
@@ -536,7 +536,7 @@ static void qt_palette_from_color(QPalette &pal, const QColor &button)
     \sa QApplication::setPalette(), QApplication::palette()
 */
 QPalette::QPalette()
-    : d(0)
+    : d(nullptr)
 {
     data.current_group = Active;
     data.resolve_mask = 0;
diff --git a/src/gui/kernel/qplatformclipboard.cpp b/src/gui/kernel/qplatformclipboard.cpp
index ab2998b901..34c94dca3b 100644
--- a/src/gui/kernel/qplatformclipboard.cpp
+++ b/src/gui/kernel/qplatformclipboard.cpp
@@ -67,7 +67,7 @@ private:
 
 QClipboardData::QClipboardData()
 {
-    src = 0;
+    src = nullptr;
 }
 
 QClipboardData::~QClipboardData()
diff --git a/src/gui/kernel/qplatformcursor.cpp b/src/gui/kernel/qplatformcursor.cpp
index 34c4549443..12065078c1 100644
--- a/src/gui/kernel/qplatformcursor.cpp
+++ b/src/gui/kernel/qplatformcursor.cpp
@@ -128,7 +128,7 @@ void QPlatformCursor::setPos(const QPoint &pos)
         qWarning("This plugin does not support QCursor::setPos()"
                  "; emulating movement within the application.");
     }
-    QWindowSystemInterface::handleMouseEvent(0, pos, pos, Qt::NoButton, Qt::NoButton, QEvent::MouseMove);
+    QWindowSystemInterface::handleMouseEvent(nullptr, pos, pos, Qt::NoButton, Qt::NoButton, QEvent::MouseMove);
 }
 
 // End of display and pointer event handling code
@@ -431,7 +431,7 @@ void QPlatformCursorImage::createSystemCursor(int id)
 {
     if (!systemCursorTableInit) {
         for (int i = 0; i <= Qt::LastCursor; i++)
-            systemCursorTable[i] = 0;
+            systemCursorTable[i] = nullptr;
         systemCursorTableInit = true;
     }
     switch (id) {
@@ -478,7 +478,7 @@ void QPlatformCursorImage::createSystemCursor(int id)
 
         case Qt::BlankCursor:
             systemCursorTable[Qt::BlankCursor] =
-                new QPlatformCursorImage(0, 0, 0, 0, 0, 0);
+                new QPlatformCursorImage(nullptr, nullptr, 0, 0, 0, 0);
             break;
 
         // 20x20 cursors
@@ -548,14 +548,14 @@ void QPlatformCursorImage::createSystemCursor(int id)
 
 void QPlatformCursorImage::set(Qt::CursorShape id)
 {
-    QPlatformCursorImage *cursor = 0;
+    QPlatformCursorImage *cursor = nullptr;
     if (unsigned(id) <= unsigned(Qt::LastCursor)) {
         if (!systemCursorTable[id])
             createSystemCursor(id);
         cursor = systemCursorTable[id];
     }
 
-    if (cursor == 0) {
+    if (cursor == nullptr) {
         if (!systemCursorTable[Qt::ArrowCursor])
             createSystemCursor(Qt::ArrowCursor);
         cursor = systemCursorTable[Qt::ArrowCursor];
diff --git a/src/gui/kernel/qplatforminputcontextfactory.cpp b/src/gui/kernel/qplatforminputcontextfactory.cpp
index df7b95d8df..749abaf27a 100644
--- a/src/gui/kernel/qplatforminputcontextfactory.cpp
+++ b/src/gui/kernel/qplatforminputcontextfactory.cpp
@@ -85,7 +85,7 @@ QPlatformInputContext *QPlatformInputContextFactory::create(const QString& key)
 #else
     Q_UNUSED(key);
 #endif
-    return 0;
+    return nullptr;
 }
 
 QPlatformInputContext *QPlatformInputContextFactory::create()
diff --git a/src/gui/kernel/qplatformintegration.cpp b/src/gui/kernel/qplatformintegration.cpp
index b3d3db0751..63f66e6bf7 100644
--- a/src/gui/kernel/qplatformintegration.cpp
+++ b/src/gui/kernel/qplatformintegration.cpp
@@ -66,7 +66,7 @@ QT_BEGIN_NAMESPACE
 */
 QPlatformFontDatabase *QPlatformIntegration::fontDatabase() const
 {
-    static QPlatformFontDatabase *db = 0;
+    static QPlatformFontDatabase *db = nullptr;
     if (!db) {
         db = new QPlatformFontDatabase;
     }
@@ -86,7 +86,7 @@ QPlatformFontDatabase *QPlatformIntegration::fontDatabase() const
 
 QPlatformClipboard *QPlatformIntegration::clipboard() const
 {
-    static QPlatformClipboard *clipboard = 0;
+    static QPlatformClipboard *clipboard = nullptr;
     if (!clipboard) {
         clipboard = new QPlatformClipboard;
     }
@@ -104,7 +104,7 @@ QPlatformClipboard *QPlatformIntegration::clipboard() const
 */
 QPlatformDrag *QPlatformIntegration::drag() const
 {
-    static QSimpleDrag *drag = 0;
+    static QSimpleDrag *drag = nullptr;
     if (!drag) {
         drag = new QSimpleDrag;
     }
@@ -114,12 +114,12 @@ QPlatformDrag *QPlatformIntegration::drag() const
 
 QPlatformNativeInterface * QPlatformIntegration::nativeInterface() const
 {
-    return 0;
+    return nullptr;
 }
 
 QPlatformServices *QPlatformIntegration::services() const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -303,7 +303,7 @@ QPlatformOpenGLContext *QPlatformIntegration::createPlatformOpenGLContext(QOpenG
 {
     Q_UNUSED(context);
     qWarning("This plugin does not support createPlatformOpenGLContext!");
-    return 0;
+    return nullptr;
 }
 #endif // QT_NO_OPENGL
 
@@ -315,7 +315,7 @@ QPlatformSharedGraphicsCache *QPlatformIntegration::createPlatformSharedGraphics
 {
     qWarning("This plugin does not support createPlatformSharedGraphicsBuffer for cacheId: %s!",
              cacheId);
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -325,7 +325,7 @@ QPlatformSharedGraphicsCache *QPlatformIntegration::createPlatformSharedGraphics
 QPaintEngine *QPlatformIntegration::createImagePaintEngine(QPaintDevice *paintDevice) const
 {
     Q_UNUSED(paintDevice)
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -357,7 +357,7 @@ void QPlatformIntegration::destroy()
 */
 QPlatformInputContext *QPlatformIntegration::inputContext() const
 {
-    return 0;
+    return nullptr;
 }
 
 #ifndef QT_NO_ACCESSIBILITY
@@ -370,7 +370,7 @@ QPlatformInputContext *QPlatformIntegration::inputContext() const
 */
 QPlatformAccessibility *QPlatformIntegration::accessibility() const
 {
-    static QPlatformAccessibility *accessibility = 0;
+    static QPlatformAccessibility *accessibility = nullptr;
     if (Q_UNLIKELY(!accessibility)) {
         accessibility = new QPlatformAccessibility;
     }
@@ -484,7 +484,7 @@ class QPlatformTheme *QPlatformIntegration::createPlatformTheme(const QString &n
 QPlatformOffscreenSurface *QPlatformIntegration::createPlatformOffscreenSurface(QOffscreenSurface *surface) const
 {
     Q_UNUSED(surface)
-    return 0;
+    return nullptr;
 }
 
 #ifndef QT_NO_SESSIONMANAGER
diff --git a/src/gui/kernel/qplatformintegrationplugin.cpp b/src/gui/kernel/qplatformintegrationplugin.cpp
index 35e4d2797b..b100eacbb5 100644
--- a/src/gui/kernel/qplatformintegrationplugin.cpp
+++ b/src/gui/kernel/qplatformintegrationplugin.cpp
@@ -54,7 +54,7 @@ QPlatformIntegration *QPlatformIntegrationPlugin::create(const QString &key, con
 {
     Q_UNUSED(key)
     Q_UNUSED(paramList);
-    return 0;
+    return nullptr;
 }
 
 QPlatformIntegration *QPlatformIntegrationPlugin::create(const QString &key, const QStringList &paramList, int &argc, char **argv)
diff --git a/src/gui/kernel/qplatformnativeinterface.cpp b/src/gui/kernel/qplatformnativeinterface.cpp
index b24541d3ec..8c9e73fbc2 100644
--- a/src/gui/kernel/qplatformnativeinterface.cpp
+++ b/src/gui/kernel/qplatformnativeinterface.cpp
@@ -56,35 +56,35 @@ QT_BEGIN_NAMESPACE
 void *QPlatformNativeInterface::nativeResourceForIntegration(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 void *QPlatformNativeInterface::nativeResourceForScreen(const QByteArray &resource, QScreen *screen)
 {
     Q_UNUSED(resource);
     Q_UNUSED(screen);
-    return 0;
+    return nullptr;
 }
 
 void *QPlatformNativeInterface::nativeResourceForWindow(const QByteArray &resource, QWindow *window)
 {
     Q_UNUSED(resource);
     Q_UNUSED(window);
-    return 0;
+    return nullptr;
 }
 
 void *QPlatformNativeInterface::nativeResourceForContext(const QByteArray &resource, QOpenGLContext *context)
 {
     Q_UNUSED(resource);
     Q_UNUSED(context);
-    return 0;
+    return nullptr;
 }
 
 void * QPlatformNativeInterface::nativeResourceForBackingStore(const QByteArray &resource, QBackingStore *backingStore)
 {
     Q_UNUSED(resource);
     Q_UNUSED(backingStore);
-    return 0;
+    return nullptr;
 }
 
 #ifndef QT_NO_CURSOR
@@ -99,31 +99,31 @@ void *QPlatformNativeInterface::nativeResourceForCursor(const QByteArray &resour
 QPlatformNativeInterface::NativeResourceForIntegrationFunction QPlatformNativeInterface::nativeResourceFunctionForIntegration(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 QPlatformNativeInterface::NativeResourceForContextFunction QPlatformNativeInterface::nativeResourceFunctionForContext(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 QPlatformNativeInterface::NativeResourceForScreenFunction QPlatformNativeInterface::nativeResourceFunctionForScreen(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 QPlatformNativeInterface::NativeResourceForWindowFunction QPlatformNativeInterface::nativeResourceFunctionForWindow(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 QPlatformNativeInterface::NativeResourceForBackingStoreFunction QPlatformNativeInterface::nativeResourceFunctionForBackingStore(const QByteArray &resource)
 {
     Q_UNUSED(resource);
-    return 0;
+    return nullptr;
 }
 
 QFunctionPointer QPlatformNativeInterface::platformFunction(const QByteArray &function) const
diff --git a/src/gui/kernel/qplatformopenglcontext.cpp b/src/gui/kernel/qplatformopenglcontext.cpp
index 07b5a0dda6..839ec008aa 100644
--- a/src/gui/kernel/qplatformopenglcontext.cpp
+++ b/src/gui/kernel/qplatformopenglcontext.cpp
@@ -81,7 +81,7 @@ QT_BEGIN_NAMESPACE
 class QPlatformOpenGLContextPrivate
 {
 public:
-    QPlatformOpenGLContextPrivate() : context(0) {}
+    QPlatformOpenGLContextPrivate() : context(nullptr) {}
 
     QOpenGLContext *context;
 };
diff --git a/src/gui/kernel/qplatformscreen.cpp b/src/gui/kernel/qplatformscreen.cpp
index e511a6f5c4..7c1e2158b1 100644
--- a/src/gui/kernel/qplatformscreen.cpp
+++ b/src/gui/kernel/qplatformscreen.cpp
@@ -54,7 +54,7 @@ QPlatformScreen::QPlatformScreen()
     : d_ptr(new QPlatformScreenPrivate)
 {
     Q_D(QPlatformScreen);
-    d->screen = 0;
+    d->screen = nullptr;
 }
 
 QPlatformScreen::~QPlatformScreen()
@@ -99,7 +99,7 @@ QWindow *QPlatformScreen::topLevelAt(const QPoint & pos) const
             return w;
     }
 
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -310,7 +310,7 @@ QPlatformScreen * QPlatformScreen::platformScreenForWindow(const QWindow *window
     // QTBUG 32681: It can happen during the transition between screens
     // when one screen is disconnected that the window doesn't have a screen.
     if (!window->screen())
-        return 0;
+        return nullptr;
     return window->screen()->handle();
 }
 
@@ -395,7 +395,7 @@ QString QPlatformScreen::serialNumber() const
 */
 QPlatformCursor *QPlatformScreen::cursor() const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/gui/kernel/qplatformtheme.cpp b/src/gui/kernel/qplatformtheme.cpp
index f906f808d8..71521c0339 100644
--- a/src/gui/kernel/qplatformtheme.cpp
+++ b/src/gui/kernel/qplatformtheme.cpp
@@ -354,7 +354,7 @@ const uint QPlatformThemePrivate::numberOfKeyBindings = sizeof(QPlatformThemePri
 #endif
 
 QPlatformThemePrivate::QPlatformThemePrivate()
-        : systemPalette(0)
+        : systemPalette(nullptr)
 { }
 
 QPlatformThemePrivate::~QPlatformThemePrivate()
@@ -394,7 +394,7 @@ bool QPlatformTheme::usePlatformNativeDialog(DialogType type) const
 QPlatformDialogHelper *QPlatformTheme::createPlatformDialogHelper(DialogType type) const
 {
     Q_UNUSED(type);
-    return 0;
+    return nullptr;
 }
 
 const QPalette *QPlatformTheme::palette(Palette type) const
@@ -405,13 +405,13 @@ const QPalette *QPlatformTheme::palette(Palette type) const
             const_cast<QPlatformTheme *>(this)->d_ptr->initializeSystemPalette();
         return d->systemPalette;
     }
-    return 0;
+    return nullptr;
 }
 
 const QFont *QPlatformTheme::font(Font type) const
 {
     Q_UNUSED(type)
-    return 0;
+    return nullptr;
 }
 
 QPixmap QPlatformTheme::standardPixmap(StandardPixmap sp, const QSizeF &size) const
@@ -569,17 +569,17 @@ QVariant QPlatformTheme::defaultThemeHint(ThemeHint hint)
 
 QPlatformMenuItem *QPlatformTheme::createPlatformMenuItem() const
 {
-    return 0;
+    return nullptr;
 }
 
 QPlatformMenu *QPlatformTheme::createPlatformMenu() const
 {
-    return 0;
+    return nullptr;
 }
 
 QPlatformMenuBar *QPlatformTheme::createPlatformMenuBar() const
 {
-    return 0;
+    return nullptr;
 }
 
 #ifndef QT_NO_SYSTEMTRAYICON
@@ -589,7 +589,7 @@ QPlatformMenuBar *QPlatformTheme::createPlatformMenuBar() const
 */
 QPlatformSystemTrayIcon *QPlatformTheme::createPlatformSystemTrayIcon() const
 {
-    return 0;
+    return nullptr;
 }
 #endif
 
diff --git a/src/gui/kernel/qscreen.cpp b/src/gui/kernel/qscreen.cpp
index 80de561297..9de59f8c7e 100644
--- a/src/gui/kernel/qscreen.cpp
+++ b/src/gui/kernel/qscreen.cpp
@@ -71,7 +71,7 @@ QT_BEGIN_NAMESPACE
 */
 
 QScreen::QScreen(QPlatformScreen *screen)
-    : QObject(*new QScreenPrivate(), 0)
+    : QObject(*new QScreenPrivate(), nullptr)
 {
     Q_D(QScreen);
     d->setPlatformScreen(screen);
diff --git a/src/gui/kernel/qsessionmanager.cpp b/src/gui/kernel/qsessionmanager.cpp
index e5e9c624b2..8747e02719 100644
--- a/src/gui/kernel/qsessionmanager.cpp
+++ b/src/gui/kernel/qsessionmanager.cpp
@@ -135,7 +135,7 @@ QSessionManagerPrivate::QSessionManagerPrivate(const QString &id,
 QSessionManagerPrivate::~QSessionManagerPrivate()
 {
     delete platformSessionManager;
-    platformSessionManager = 0;
+    platformSessionManager = nullptr;
 }
 
 QSessionManager::QSessionManager(QGuiApplication *app, QString &id, QString &key)
diff --git a/src/gui/kernel/qshortcutmap.cpp b/src/gui/kernel/qshortcutmap.cpp
index 9ed450b031..a7ea20266b 100644
--- a/src/gui/kernel/qshortcutmap.cpp
+++ b/src/gui/kernel/qshortcutmap.cpp
@@ -65,11 +65,11 @@ Q_LOGGING_CATEGORY(lcShortcutMap, "qt.gui.shortcutmap")
 struct QShortcutEntry
 {
     QShortcutEntry()
-        : keyseq(0), context(Qt::WindowShortcut), enabled(false), autorepeat(1), id(0), owner(0), contextMatcher(0)
+        : keyseq(0), context(Qt::WindowShortcut), enabled(false), autorepeat(1), id(0), owner(nullptr), contextMatcher(nullptr)
     {}
 
     QShortcutEntry(const QKeySequence &k)
-        : keyseq(k), context(Qt::WindowShortcut), enabled(false), autorepeat(1), id(0), owner(0), contextMatcher(0)
+        : keyseq(k), context(Qt::WindowShortcut), enabled(false), autorepeat(1), id(0), owner(nullptr), contextMatcher(nullptr)
     {}
 
     QShortcutEntry(QObject *o, const QKeySequence &k, Qt::ShortcutContext c, int i, bool a, QShortcutMap::ContextMatcher m)
@@ -184,7 +184,7 @@ int QShortcutMap::removeShortcut(int id, QObject *owner, const QKeySequence &key
 {
     Q_D(QShortcutMap);
     int itemsRemoved = 0;
-    bool allOwners = (owner == 0);
+    bool allOwners = (owner == nullptr);
     bool allKeys = key.isEmpty();
     bool allIds = id == 0;
 
@@ -228,7 +228,7 @@ int QShortcutMap::setShortcutEnabled(bool enable, int id, QObject *owner, const
 {
     Q_D(QShortcutMap);
     int itemsChanged = 0;
-    bool allOwners = (owner == 0);
+    bool allOwners = (owner == nullptr);
     bool allKeys = key.isEmpty();
     bool allIds = id == 0;
 
@@ -264,7 +264,7 @@ int QShortcutMap::setShortcutAutoRepeat(bool on, int id, QObject *owner, const Q
 {
     Q_D(QShortcutMap);
     int itemsChanged = 0;
-    bool allOwners = (owner == 0);
+    bool allOwners = (owner == nullptr);
     bool allKeys = key.isEmpty();
     bool allIds = id == 0;
 
@@ -638,7 +638,7 @@ void QShortcutMap::dispatchEvent(QKeyEvent *e)
         d->prevSequence = curKey;
     }
     // Find next
-    const QShortcutEntry *current = 0, *next = 0;
+    const QShortcutEntry *current = nullptr, *next = nullptr;
     int i = 0, enabledShortcuts = 0;
     QVector<const QShortcutEntry*> ambiguousShortcuts;
     while(i < d->identicals.size()) {
diff --git a/src/gui/kernel/qsimpledrag.cpp b/src/gui/kernel/qsimpledrag.cpp
index 803206477c..dec3cc399d 100644
--- a/src/gui/kernel/qsimpledrag.cpp
+++ b/src/gui/kernel/qsimpledrag.cpp
@@ -76,7 +76,7 @@ static QWindow* topLevelAt(const QPoint &pos)
         if (w->isVisible() && w->handle() && w->geometry().contains(pos) && !qobject_cast<QShapedPixmapWindow*>(w))
             return w;
     }
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/gui/kernel/qstylehints.cpp b/src/gui/kernel/qstylehints.cpp
index 732ede90d0..7b3c70c51b 100644
--- a/src/gui/kernel/qstylehints.cpp
+++ b/src/gui/kernel/qstylehints.cpp
@@ -116,7 +116,7 @@ public:
     \sa QGuiApplication::styleHints()
  */
 QStyleHints::QStyleHints()
-    : QObject(*new QStyleHintsPrivate(), 0)
+    : QObject(*new QStyleHintsPrivate(), nullptr)
 {
 }
 
diff --git a/src/gui/kernel/qsurface.cpp b/src/gui/kernel/qsurface.cpp
index 709f28d431..85c576b21c 100644
--- a/src/gui/kernel/qsurface.cpp
+++ b/src/gui/kernel/qsurface.cpp
@@ -134,7 +134,7 @@ bool QSurface::supportsOpenGL() const
     Creates a surface with the given \a type.
 */
 QSurface::QSurface(SurfaceClass type)
-    : m_type(type), m_reserved(0)
+    : m_type(type), m_reserved(nullptr)
 {
 }
 
diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index b71a0c54aa..74e0e6401e 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -156,7 +156,7 @@ QT_BEGIN_NAMESPACE
     \sa setScreen()
 */
 QWindow::QWindow(QScreen *targetScreen)
-    : QObject(*new QWindowPrivate(), 0)
+    : QObject(*new QWindowPrivate(), nullptr)
     , QSurface(QSurface::Window)
 {
     Q_D(QWindow);
@@ -223,7 +223,7 @@ QWindow::~QWindow()
     // some cases end up becoming the focus window again. Clear it again
     // here as a workaround. See QTBUG-75326.
     if (QGuiApplicationPrivate::focus_window == this)
-        QGuiApplicationPrivate::focus_window = 0;
+        QGuiApplicationPrivate::focus_window = nullptr;
 }
 
 void QWindowPrivate::init(QScreen *targetScreen)
@@ -469,7 +469,7 @@ inline bool QWindowPrivate::windowRecreationRequired(QScreen *newScreen) const
 inline void QWindowPrivate::disconnectFromScreen()
 {
     if (topLevelScreen)
-        topLevelScreen = 0;
+        topLevelScreen = nullptr;
 }
 
 void QWindowPrivate::connectToScreen(QScreen *screen)
@@ -732,7 +732,7 @@ void QWindow::setParent(QWindow *parent)
         if (parent)
             parent->create();
 
-        d->platformWindow->setParent(parent ? parent->d_func()->platformWindow : 0);
+        d->platformWindow->setParent(parent ? parent->d_func()->platformWindow : nullptr);
     }
 
     QGuiApplicationPrivate::updateBlockedStatus(this);
@@ -744,7 +744,7 @@ void QWindow::setParent(QWindow *parent)
 bool QWindow::isTopLevel() const
 {
     Q_D(const QWindow);
-    return d->parentWindow == 0;
+    return d->parentWindow == nullptr;
 }
 
 /*!
@@ -2018,7 +2018,7 @@ void QWindow::setScreen(QScreen *newScreen)
     Q_D(QWindow);
     if (!newScreen)
         newScreen = QGuiApplication::primaryScreen();
-    d->setTopLevelScreen(newScreen, newScreen != 0);
+    d->setTopLevelScreen(newScreen, newScreen != nullptr);
 }
 
 /*!
@@ -2036,7 +2036,7 @@ void QWindow::setScreen(QScreen *newScreen)
   */
 QAccessibleInterface *QWindow::accessibleRoot() const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -2696,7 +2696,7 @@ QWindow *QWindow::fromWinId(WId id)
 {
     if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::ForeignWindows)) {
         qWarning("QWindow::fromWinId(): platform plugin does not support foreign windows.");
-        return 0;
+        return nullptr;
     }
 
     QWindow *window = new QWindow;
@@ -2770,7 +2770,7 @@ void QWindow::setCursor(const QCursor &cursor)
 void QWindow::unsetCursor()
 {
     Q_D(QWindow);
-    d->setCursor(0);
+    d->setCursor(nullptr);
 }
 
 /*!
diff --git a/src/gui/kernel/qwindowsysteminterface.cpp b/src/gui/kernel/qwindowsysteminterface.cpp
index ba04f8701d..c9a70897d6 100644
--- a/src/gui/kernel/qwindowsysteminterface.cpp
+++ b/src/gui/kernel/qwindowsysteminterface.cpp
@@ -179,7 +179,7 @@ void QWindowSystemInterfacePrivate::installWindowSystemEventHandler(QWindowSyste
 void QWindowSystemInterfacePrivate::removeWindowSystemEventhandler(QWindowSystemEventHandler *handler)
 {
     if (eventHandler == handler)
-        eventHandler = 0;
+        eventHandler = nullptr;
 }
 
 QWindowSystemEventHandler::~QWindowSystemEventHandler()
diff --git a/src/gui/opengl/qopengl.cpp b/src/gui/opengl/qopengl.cpp
index 667d16317f..adca536797 100644
--- a/src/gui/opengl/qopengl.cpp
+++ b/src/gui/opengl/qopengl.cpp
@@ -72,7 +72,7 @@ QOpenGLExtensionMatcher::QOpenGLExtensionMatcher()
         return;
     }
     QOpenGLFunctions *funcs = ctx->functions();
-    const char *extensionStr = 0;
+    const char *extensionStr = nullptr;
 
     if (ctx->isOpenGLES() || ctx->format().majorVersion() < 3)
         extensionStr = reinterpret_cast<const char *>(funcs->glGetString(GL_EXTENSIONS));
diff --git a/src/gui/opengl/qopenglbuffer.cpp b/src/gui/opengl/qopenglbuffer.cpp
index 5ad16a8438..5387cc06e3 100644
--- a/src/gui/opengl/qopenglbuffer.cpp
+++ b/src/gui/opengl/qopenglbuffer.cpp
@@ -143,10 +143,10 @@ public:
     QOpenGLBufferPrivate(QOpenGLBuffer::Type t)
         : ref(1),
           type(t),
-          guard(0),
+          guard(nullptr),
           usagePattern(QOpenGLBuffer::StaticDraw),
           actualUsagePattern(QOpenGLBuffer::StaticDraw),
-          funcs(0)
+          funcs(nullptr)
     {
     }
 
@@ -323,10 +323,10 @@ void QOpenGLBuffer::destroy()
     Q_D(QOpenGLBuffer);
     if (d->guard) {
         d->guard->free();
-        d->guard = 0;
+        d->guard = nullptr;
     }
     delete d->funcs;
-    d->funcs = 0;
+    d->funcs = nullptr;
 }
 
 /*!
@@ -586,7 +586,7 @@ void *QOpenGLBuffer::mapRange(int offset, int count, QOpenGLBuffer::RangeAccessF
         qWarning("QOpenGLBuffer::mapRange(): buffer not created");
 #endif
     if (!d->guard || !d->guard->id())
-        return 0;
+        return nullptr;
     return d->funcs->glMapBufferRange(d->type, offset, count, access);
 }
 
diff --git a/src/gui/opengl/qopenglcustomshaderstage.cpp b/src/gui/opengl/qopenglcustomshaderstage.cpp
index baa44f86b0..a95a0a5767 100644
--- a/src/gui/opengl/qopenglcustomshaderstage.cpp
+++ b/src/gui/opengl/qopenglcustomshaderstage.cpp
@@ -48,7 +48,7 @@ class QOpenGLCustomShaderStagePrivate
 {
 public:
     QOpenGLCustomShaderStagePrivate() :
-        m_manager(0) {}
+        m_manager(nullptr) {}
 
     QPointer<QOpenGLEngineShaderManager> m_manager;
     QByteArray              m_source;
@@ -110,8 +110,8 @@ void QOpenGLCustomShaderStage::removeFromPainter(QPainter* p)
     // Just set the stage to null, don't call removeCustomStage().
     // This should leave the program in a compiled/linked state
     // if the next custom shader stage is this one again.
-    d->m_manager->setCustomStage(0);
-    d->m_manager = 0;
+    d->m_manager->setCustomStage(nullptr);
+    d->m_manager = nullptr;
 }
 
 QByteArray QOpenGLCustomShaderStage::source() const
@@ -125,7 +125,7 @@ QByteArray QOpenGLCustomShaderStage::source() const
 void QOpenGLCustomShaderStage::setInactive()
 {
     Q_D(QOpenGLCustomShaderStage);
-    d->m_manager = 0;
+    d->m_manager = nullptr;
 }
 
 void QOpenGLCustomShaderStage::setSource(const QByteArray& s)
diff --git a/src/gui/opengl/qopengldebug.cpp b/src/gui/opengl/qopengldebug.cpp
index 462a4fdb3b..310006feaf 100644
--- a/src/gui/opengl/qopengldebug.cpp
+++ b/src/gui/opengl/qopengldebug.cpp
@@ -1108,14 +1108,14 @@ public:
     \internal
 */
 QOpenGLDebugLoggerPrivate::QOpenGLDebugLoggerPrivate()
-    : glDebugMessageControl(0),
-      glDebugMessageInsert(0),
-      glDebugMessageCallback(0),
-      glGetDebugMessageLog(0),
-      glPushDebugGroup(0),
-      glPopDebugGroup(0),
-      oldDebugCallbackFunction(0),
-      context(0),
+    : glDebugMessageControl(nullptr),
+      glDebugMessageInsert(nullptr),
+      glDebugMessageCallback(nullptr),
+      glGetDebugMessageLog(nullptr),
+      glPushDebugGroup(nullptr),
+      glPopDebugGroup(nullptr),
+      oldDebugCallbackFunction(nullptr),
+      context(nullptr),
       maxMessageLength(0),
       loggingMode(QOpenGLDebugLogger::AsynchronousLogging),
       initialized(false),
@@ -1228,7 +1228,7 @@ void QOpenGLDebugLoggerPrivate::controlDebugMessages(QOpenGLDebugMessage::Source
     const GLsizei idCount = ids.count();
     // The GL_KHR_debug extension says that if idCount is 0, idPtr must be ignored.
     // Unfortunately, some bugged drivers do NOT ignore it, so pass NULL in case.
-    const GLuint * const idPtr = idCount ? ids.constData() : 0;
+    const GLuint * const idPtr = idCount ? ids.constData() : nullptr;
 
     for (GLenum source : glSources)
         for (GLenum type : glTypes)
@@ -1247,7 +1247,7 @@ void QOpenGLDebugLoggerPrivate::_q_contextAboutToBeDestroyed()
 
     // Save the current context and its surface in case we need to set them back
     QOpenGLContext *currentContext = QOpenGLContext::currentContext();
-    QSurface *currentSurface = 0;
+    QSurface *currentSurface = nullptr;
 
     QScopedPointer<QOffscreenSurface> offscreenSurface;
 
@@ -1275,7 +1275,7 @@ void QOpenGLDebugLoggerPrivate::_q_contextAboutToBeDestroyed()
     }
 
     QObject::disconnect(context, SIGNAL(aboutToBeDestroyed()), q, SLOT(_q_contextAboutToBeDestroyed()));
-    context = 0;
+    context = nullptr;
     initialized = false;
 }
 
@@ -1356,7 +1356,7 @@ bool QOpenGLDebugLogger::initialize()
         disconnect(d->context, SIGNAL(aboutToBeDestroyed()), this, SLOT(_q_contextAboutToBeDestroyed()));
 
     d->initialized = false;
-    d->context = 0;
+    d->context = nullptr;
 
     if (!context->hasExtension(QByteArrayLiteral("GL_KHR_debug")))
         return false;
diff --git a/src/gui/opengl/qopenglengineshadermanager.cpp b/src/gui/opengl/qopenglengineshadermanager.cpp
index 1e5a10c99c..a569975486 100644
--- a/src/gui/opengl/qopenglengineshadermanager.cpp
+++ b/src/gui/opengl/qopenglengineshadermanager.cpp
@@ -72,7 +72,7 @@ public:
     void invalidateResource() override
     {
         delete m_shaders;
-        m_shaders = 0;
+        m_shaders = nullptr;
     }
 
     void freeResource(QOpenGLContext *) override
@@ -94,7 +94,7 @@ public:
             shaders = new QOpenGLMultiGroupSharedResource;
         QOpenGLEngineSharedShadersResource *resource =
             shaders->value<QOpenGLEngineSharedShadersResource>(context);
-        return resource ? resource->shaders() : 0;
+        return resource ? resource->shaders() : nullptr;
     }
 
 private:
@@ -116,8 +116,8 @@ const char* QOpenGLEngineSharedShaders::qShaderSnippets[] = {
 };
 
 QOpenGLEngineSharedShaders::QOpenGLEngineSharedShaders(QOpenGLContext* context)
-    : blitShaderProg(0)
-    , simpleShaderProg(0)
+    : blitShaderProg(nullptr)
+    , simpleShaderProg(nullptr)
 {
 
 /*
@@ -341,12 +341,12 @@ QOpenGLEngineSharedShaders::~QOpenGLEngineSharedShaders()
 
     if (blitShaderProg) {
         delete blitShaderProg;
-        blitShaderProg = 0;
+        blitShaderProg = nullptr;
     }
 
     if (simpleShaderProg) {
         delete simpleShaderProg;
-        simpleShaderProg = 0;
+        simpleShaderProg = nullptr;
     }
 }
 
@@ -507,8 +507,8 @@ QOpenGLEngineShaderManager::QOpenGLEngineShaderManager(QOpenGLContext* context)
       opacityMode(NoOpacity),
       maskType(NoMask),
       compositionMode(QPainter::CompositionMode_SourceOver),
-      customSrcStage(0),
-      currentShaderProg(0)
+      customSrcStage(nullptr),
+      currentShaderProg(nullptr)
 {
     sharedShaders = QOpenGLEngineSharedShaders::shadersForContext(context);
 }
@@ -627,7 +627,7 @@ void QOpenGLEngineShaderManager::removeCustomStage()
 {
     if (customSrcStage)
         customSrcStage->setInactive();
-    customSrcStage = 0;
+    customSrcStage = nullptr;
     shaderProgNeedsChanging = true;
 }
 
@@ -684,7 +684,7 @@ bool QOpenGLEngineShaderManager::useCorrectShaderProg()
     if (!shaderProgNeedsChanging)
         return false;
 
-    bool useCustomSrc = customSrcStage != 0;
+    bool useCustomSrc = customSrcStage != nullptr;
     if (useCustomSrc && srcPixelType != QOpenGLEngineShaderManager::ImageSrc && srcPixelType != Qt::TexturePattern) {
         useCustomSrc = false;
         qWarning("QOpenGLEngineShaderManager - Ignoring custom shader stage for non image src");
diff --git a/src/gui/opengl/qopenglframebufferobject.cpp b/src/gui/opengl/qopenglframebufferobject.cpp
index bb0dbdc9bd..d7a6d32218 100644
--- a/src/gui/opengl/qopenglframebufferobject.cpp
+++ b/src/gui/opengl/qopenglframebufferobject.cpp
@@ -551,7 +551,7 @@ void QOpenGLFramebufferObjectPrivate::initTexture(int idx)
         pixelType = GL_UNSIGNED_SHORT;
 
     funcs.glTexImage2D(target, 0, color.internalFormat, color.size.width(), color.size.height(), 0,
-                       GL_RGBA, pixelType, NULL);
+                       GL_RGBA, pixelType, nullptr);
     if (format.mipmap()) {
         int width = color.size.width();
         int height = color.size.height();
@@ -561,7 +561,7 @@ void QOpenGLFramebufferObjectPrivate::initTexture(int idx)
             height = qMax(1, height >> 1);
             ++level;
             funcs.glTexImage2D(target, level, color.internalFormat, width, height, 0,
-                               GL_RGBA, pixelType, NULL);
+                               GL_RGBA, pixelType, nullptr);
         }
     }
     funcs.glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + idx,
@@ -640,8 +640,8 @@ void QOpenGLFramebufferObjectPrivate::initDepthStencilAttachments(QOpenGLContext
             stencil_buffer_guard->free();
     }
 
-    depth_buffer_guard = 0;
-    stencil_buffer_guard = 0;
+    depth_buffer_guard = nullptr;
+    stencil_buffer_guard = nullptr;
 
     GLuint depth_buffer = 0;
     GLuint stencil_buffer = 0;
@@ -1284,7 +1284,7 @@ GLuint QOpenGLFramebufferObject::takeTexture(int colorAttachmentIndex)
         id = guard ? guard->id() : 0;
         // Do not call free() on texture_guard, just null it out.
         // This way the texture will not be deleted when the guard is destroyed.
-        guard = 0;
+        guard = nullptr;
     }
     return id;
 }
@@ -1564,7 +1564,7 @@ bool QOpenGLFramebufferObject::bindDefault()
         qWarning("QOpenGLFramebufferObject::bindDefault() called without current context.");
 #endif
 
-    return ctx != 0;
+    return ctx != nullptr;
 }
 
 /*!
diff --git a/src/gui/opengl/qopenglfunctions.cpp b/src/gui/opengl/qopenglfunctions.cpp
index 3e9eb3dd0a..11ca802ee6 100644
--- a/src/gui/opengl/qopenglfunctions.cpp
+++ b/src/gui/opengl/qopenglfunctions.cpp
@@ -182,7 +182,7 @@ struct QOpenGLFunctionsPrivateEx : public QOpenGLExtensionsPrivate, public QOpen
 
 Q_GLOBAL_STATIC(QOpenGLMultiGroupSharedResource, qt_gl_functions_resource)
 
-static QOpenGLFunctionsPrivateEx *qt_gl_functions(QOpenGLContext *context = 0)
+static QOpenGLFunctionsPrivateEx *qt_gl_functions(QOpenGLContext *context = nullptr)
 {
     if (!context)
         context = QOpenGLContext::currentContext();
@@ -200,7 +200,7 @@ static QOpenGLFunctionsPrivateEx *qt_gl_functions(QOpenGLContext *context = 0)
     \sa initializeOpenGLFunctions()
 */
 QOpenGLFunctions::QOpenGLFunctions()
-    : d_ptr(0)
+    : d_ptr(nullptr)
 {
 }
 
@@ -218,7 +218,7 @@ QOpenGLFunctions::QOpenGLFunctions()
     \sa initializeOpenGLFunctions()
 */
 QOpenGLFunctions::QOpenGLFunctions(QOpenGLContext *context)
-    : d_ptr(0)
+    : d_ptr(nullptr)
 {
     if (context && QOpenGLContextGroup::currentContextGroup() == context->shareGroup())
         d_ptr = qt_gl_functions(context);
diff --git a/src/gui/opengl/qopenglfunctions_1_0.cpp b/src/gui/opengl/qopenglfunctions_1_0.cpp
index f017c68fd9..f9d93ce210 100644
--- a/src/gui/opengl/qopenglfunctions_1_0.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_0.cpp
@@ -67,8 +67,8 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_0::QOpenGLFunctions_1_0()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_0_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
 {
 }
 
@@ -98,7 +98,7 @@ bool QOpenGLFunctions_1_0::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_1_1.cpp b/src/gui/opengl/qopenglfunctions_1_1.cpp
index a819d499f8..b0f7538d48 100644
--- a/src/gui/opengl/qopenglfunctions_1_1.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_1.cpp
@@ -67,10 +67,10 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_1::QOpenGLFunctions_1_1()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
 {
 }
 
@@ -108,7 +108,7 @@ bool QOpenGLFunctions_1_1::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_1_2.cpp b/src/gui/opengl/qopenglfunctions_1_2.cpp
index 61db2b4e0f..5f137b0237 100644
--- a/src/gui/opengl/qopenglfunctions_1_2.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_2.cpp
@@ -67,12 +67,12 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_2::QOpenGLFunctions_1_2()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
 {
 }
 
@@ -118,7 +118,7 @@ bool QOpenGLFunctions_1_2::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_1_3.cpp b/src/gui/opengl/qopenglfunctions_1_3.cpp
index acc223ea74..0b5ff2fee5 100644
--- a/src/gui/opengl/qopenglfunctions_1_3.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_3.cpp
@@ -67,14 +67,14 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_3::QOpenGLFunctions_1_3()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
 {
 }
 
@@ -128,7 +128,7 @@ bool QOpenGLFunctions_1_3::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_1_4.cpp b/src/gui/opengl/qopenglfunctions_1_4.cpp
index 8e2349dc08..9419c1aa85 100644
--- a/src/gui/opengl/qopenglfunctions_1_4.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_4.cpp
@@ -67,16 +67,16 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_4::QOpenGLFunctions_1_4()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
 {
 }
 
@@ -138,7 +138,7 @@ bool QOpenGLFunctions_1_4::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_1_5.cpp b/src/gui/opengl/qopenglfunctions_1_5.cpp
index cd81cf8b35..3fa7668a36 100644
--- a/src/gui/opengl/qopenglfunctions_1_5.cpp
+++ b/src/gui/opengl/qopenglfunctions_1_5.cpp
@@ -67,17 +67,17 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_1_5::QOpenGLFunctions_1_5()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
 {
 }
 
@@ -143,7 +143,7 @@ bool QOpenGLFunctions_1_5::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_2_0.cpp b/src/gui/opengl/qopenglfunctions_2_0.cpp
index 97a8c72fa6..29eb055a1d 100644
--- a/src/gui/opengl/qopenglfunctions_2_0.cpp
+++ b/src/gui/opengl/qopenglfunctions_2_0.cpp
@@ -67,18 +67,18 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_2_0::QOpenGLFunctions_2_0()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
 {
 }
@@ -149,7 +149,7 @@ bool QOpenGLFunctions_2_0::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_2_1.cpp b/src/gui/opengl/qopenglfunctions_2_1.cpp
index 00bdc1bbba..8a7170dd7d 100644
--- a/src/gui/opengl/qopenglfunctions_2_1.cpp
+++ b/src/gui/opengl/qopenglfunctions_2_1.cpp
@@ -67,19 +67,19 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_2_1::QOpenGLFunctions_2_1()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
 {
 }
@@ -154,7 +154,7 @@ bool QOpenGLFunctions_2_1::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_0.cpp b/src/gui/opengl/qopenglfunctions_3_0.cpp
index 2c239dba1f..7d0e900659 100644
--- a/src/gui/opengl/qopenglfunctions_3_0.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_0.cpp
@@ -67,20 +67,20 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_0::QOpenGLFunctions_3_0()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
  , m_reserved_3_0_Deprecated(nullptr)
 {
@@ -160,7 +160,7 @@ bool QOpenGLFunctions_3_0::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_1.cpp b/src/gui/opengl/qopenglfunctions_3_1.cpp
index f62f555c8e..c25b124af8 100644
--- a/src/gui/opengl/qopenglfunctions_3_1.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_1.cpp
@@ -67,16 +67,16 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_1::QOpenGLFunctions_3_1()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
 {
 }
 
@@ -138,7 +138,7 @@ bool QOpenGLFunctions_3_1::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_2_compatibility.cpp b/src/gui/opengl/qopenglfunctions_3_2_compatibility.cpp
index ba7be2d893..3e4fd96dc2 100644
--- a/src/gui/opengl/qopenglfunctions_3_2_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_2_compatibility.cpp
@@ -67,22 +67,22 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_2_Compatibility::QOpenGLFunctions_3_2_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
  , m_reserved_3_0_Deprecated(nullptr)
 {
@@ -170,7 +170,7 @@ bool QOpenGLFunctions_3_2_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_2_core.cpp b/src/gui/opengl/qopenglfunctions_3_2_core.cpp
index 4c1e3eb3da..ea89fc9e48 100644
--- a/src/gui/opengl/qopenglfunctions_3_2_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_2_core.cpp
@@ -67,17 +67,17 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_2_Core::QOpenGLFunctions_3_2_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
 {
 }
 
@@ -143,7 +143,7 @@ bool QOpenGLFunctions_3_2_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_3_compatibility.cpp b/src/gui/opengl/qopenglfunctions_3_3_compatibility.cpp
index c750c6e0cc..a26d7d99b1 100644
--- a/src/gui/opengl/qopenglfunctions_3_3_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_3_compatibility.cpp
@@ -67,25 +67,25 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_3_Compatibility::QOpenGLFunctions_3_3_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
- , d_3_3_Deprecated(0)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -179,7 +179,7 @@ bool QOpenGLFunctions_3_3_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_3_3_core.cpp b/src/gui/opengl/qopenglfunctions_3_3_core.cpp
index 5723509e32..277ad1eb14 100644
--- a/src/gui/opengl/qopenglfunctions_3_3_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_3_3_core.cpp
@@ -67,18 +67,18 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_3_3_Core::QOpenGLFunctions_3_3_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
 {
 }
 
@@ -148,7 +148,7 @@ bool QOpenGLFunctions_3_3_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_0_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_0_compatibility.cpp
index 6ae7643eb5..655f1e6fd4 100644
--- a/src/gui/opengl/qopenglfunctions_4_0_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_0_compatibility.cpp
@@ -67,26 +67,26 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_0_Compatibility::QOpenGLFunctions_4_0_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
- , d_3_3_Deprecated(0)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -184,7 +184,7 @@ bool QOpenGLFunctions_4_0_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_0_core.cpp b/src/gui/opengl/qopenglfunctions_4_0_core.cpp
index cd4fdb8b2b..60453d147c 100644
--- a/src/gui/opengl/qopenglfunctions_4_0_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_0_core.cpp
@@ -67,19 +67,19 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_0_Core::QOpenGLFunctions_4_0_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
 {
 }
 
@@ -153,7 +153,7 @@ bool QOpenGLFunctions_4_0_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_1_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_1_compatibility.cpp
index d104c74bc2..bdea8b5ba9 100644
--- a/src/gui/opengl/qopenglfunctions_4_1_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_1_compatibility.cpp
@@ -67,27 +67,27 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_1_Compatibility::QOpenGLFunctions_4_1_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
- , d_3_3_Deprecated(0)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -189,7 +189,7 @@ bool QOpenGLFunctions_4_1_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_1_core.cpp b/src/gui/opengl/qopenglfunctions_4_1_core.cpp
index 7527aba620..b21742d9c1 100644
--- a/src/gui/opengl/qopenglfunctions_4_1_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_1_core.cpp
@@ -67,20 +67,20 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_1_Core::QOpenGLFunctions_4_1_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
 {
 }
 
@@ -158,7 +158,7 @@ bool QOpenGLFunctions_4_1_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_2_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_2_compatibility.cpp
index a5b1b37495..41ab9ae762 100644
--- a/src/gui/opengl/qopenglfunctions_4_2_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_2_compatibility.cpp
@@ -67,28 +67,28 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_2_Compatibility::QOpenGLFunctions_4_2_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
- , d_3_3_Deprecated(0)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -194,7 +194,7 @@ bool QOpenGLFunctions_4_2_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_2_core.cpp b/src/gui/opengl/qopenglfunctions_4_2_core.cpp
index 1381236926..38dbe1b596 100644
--- a/src/gui/opengl/qopenglfunctions_4_2_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_2_core.cpp
@@ -67,21 +67,21 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_2_Core::QOpenGLFunctions_4_2_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
 {
 }
 
@@ -163,7 +163,7 @@ bool QOpenGLFunctions_4_2_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_3_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_3_compatibility.cpp
index 5c0c711d1c..1b23d08ee2 100644
--- a/src/gui/opengl/qopenglfunctions_4_3_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_3_compatibility.cpp
@@ -67,29 +67,29 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_3_Compatibility::QOpenGLFunctions_4_3_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
  , m_reserved_2_0_Deprecated(nullptr)
- , d_3_3_Deprecated(0)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -199,7 +199,7 @@ bool QOpenGLFunctions_4_3_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_3_core.cpp b/src/gui/opengl/qopenglfunctions_4_3_core.cpp
index 34460b841e..8a867471b8 100644
--- a/src/gui/opengl/qopenglfunctions_4_3_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_3_core.cpp
@@ -67,22 +67,22 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_3_Core::QOpenGLFunctions_4_3_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
 {
 }
 
@@ -168,7 +168,7 @@ bool QOpenGLFunctions_4_3_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_4_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_4_compatibility.cpp
index 907994a3c4..4fc4b50100 100644
--- a/src/gui/opengl/qopenglfunctions_4_4_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_4_compatibility.cpp
@@ -67,29 +67,29 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_4_Compatibility::QOpenGLFunctions_4_4_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
- , d_4_4_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
- , d_3_3_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
+ , d_4_4_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
+ , d_3_3_Deprecated(nullptr)
 {
 }
 
@@ -203,7 +203,7 @@ bool QOpenGLFunctions_4_4_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_4_core.cpp b/src/gui/opengl/qopenglfunctions_4_4_core.cpp
index 76c0323f6d..6169c7f455 100644
--- a/src/gui/opengl/qopenglfunctions_4_4_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_4_core.cpp
@@ -67,23 +67,23 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_4_Core::QOpenGLFunctions_4_4_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
- , d_4_4_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
+ , d_4_4_Core(nullptr)
 {
 }
 
@@ -173,7 +173,7 @@ bool QOpenGLFunctions_4_4_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_5_compatibility.cpp b/src/gui/opengl/qopenglfunctions_4_5_compatibility.cpp
index c415bb06ff..02af443498 100644
--- a/src/gui/opengl/qopenglfunctions_4_5_compatibility.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_5_compatibility.cpp
@@ -67,31 +67,31 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_5_Compatibility::QOpenGLFunctions_4_5_Compatibility()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
- , d_4_4_Core(0)
- , d_4_5_Core(0)
- , d_1_0_Deprecated(0)
- , d_1_1_Deprecated(0)
- , d_1_2_Deprecated(0)
- , d_1_3_Deprecated(0)
- , d_1_4_Deprecated(0)
- , d_3_3_Deprecated(0)
- , d_4_5_Deprecated(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
+ , d_4_4_Core(nullptr)
+ , d_4_5_Core(nullptr)
+ , d_1_0_Deprecated(nullptr)
+ , d_1_1_Deprecated(nullptr)
+ , d_1_2_Deprecated(nullptr)
+ , d_1_3_Deprecated(nullptr)
+ , d_1_4_Deprecated(nullptr)
+ , d_3_3_Deprecated(nullptr)
+ , d_4_5_Deprecated(nullptr)
 {
 }
 
@@ -213,7 +213,7 @@ bool QOpenGLFunctions_4_5_Compatibility::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglfunctions_4_5_core.cpp b/src/gui/opengl/qopenglfunctions_4_5_core.cpp
index 4dfac3579c..9c0369e5f2 100644
--- a/src/gui/opengl/qopenglfunctions_4_5_core.cpp
+++ b/src/gui/opengl/qopenglfunctions_4_5_core.cpp
@@ -67,24 +67,24 @@ QT_BEGIN_NAMESPACE
 
 QOpenGLFunctions_4_5_Core::QOpenGLFunctions_4_5_Core()
  : QAbstractOpenGLFunctions()
- , d_1_0_Core(0)
- , d_1_1_Core(0)
- , d_1_2_Core(0)
- , d_1_3_Core(0)
- , d_1_4_Core(0)
- , d_1_5_Core(0)
- , d_2_0_Core(0)
- , d_2_1_Core(0)
- , d_3_0_Core(0)
- , d_3_1_Core(0)
- , d_3_2_Core(0)
- , d_3_3_Core(0)
- , d_4_0_Core(0)
- , d_4_1_Core(0)
- , d_4_2_Core(0)
- , d_4_3_Core(0)
- , d_4_4_Core(0)
- , d_4_5_Core(0)
+ , d_1_0_Core(nullptr)
+ , d_1_1_Core(nullptr)
+ , d_1_2_Core(nullptr)
+ , d_1_3_Core(nullptr)
+ , d_1_4_Core(nullptr)
+ , d_1_5_Core(nullptr)
+ , d_2_0_Core(nullptr)
+ , d_2_1_Core(nullptr)
+ , d_3_0_Core(nullptr)
+ , d_3_1_Core(nullptr)
+ , d_3_2_Core(nullptr)
+ , d_3_3_Core(nullptr)
+ , d_4_0_Core(nullptr)
+ , d_4_1_Core(nullptr)
+ , d_4_2_Core(nullptr)
+ , d_4_3_Core(nullptr)
+ , d_4_4_Core(nullptr)
+ , d_4_5_Core(nullptr)
 {
 }
 
@@ -178,7 +178,7 @@ bool QOpenGLFunctions_4_5_Core::initializeOpenGLFunctions()
     {
         // Associate with private implementation, creating if necessary
         // Function pointers in the backends are resolved at creation time
-        QOpenGLVersionFunctionsBackend* d = 0;
+        QOpenGLVersionFunctionsBackend* d = nullptr;
         d = QAbstractOpenGLFunctionsPrivate::functionsBackend(context, QOpenGLFunctions_1_0_CoreBackend::versionStatus());
         d_1_0_Core = static_cast<QOpenGLFunctions_1_0_CoreBackend*>(d);
         d->refs.ref();
diff --git a/src/gui/opengl/qopenglpaintdevice.cpp b/src/gui/opengl/qopenglpaintdevice.cpp
index 3a0c02feb0..3920a10467 100644
--- a/src/gui/opengl/qopenglpaintdevice.cpp
+++ b/src/gui/opengl/qopenglpaintdevice.cpp
@@ -171,7 +171,7 @@ QOpenGLPaintDevicePrivate::QOpenGLPaintDevicePrivate(const QSize &sz)
     , dpmy(qt_defaultDpiY() * 100. / 2.54)
     , devicePixelRatio(1.0)
     , flipped(false)
-    , engine(0)
+    , engine(nullptr)
 {
 }
 
diff --git a/src/gui/opengl/qopenglpaintengine.cpp b/src/gui/opengl/qopenglpaintengine.cpp
index 20cc2b5ae5..a82edbb073 100644
--- a/src/gui/opengl/qopenglpaintengine.cpp
+++ b/src/gui/opengl/qopenglpaintengine.cpp
@@ -881,7 +881,7 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                     Q_ASSERT(cache->ibo == 0);
 #else
                     free(cache->vertices);
-                    Q_ASSERT(cache->indices == 0);
+                    Q_ASSERT(cache->indices == nullptr);
 #endif
                     updateCache = true;
                 }
@@ -909,7 +909,7 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 #else
                 cache->vertices = (float *) malloc(floatSizeInBytes);
                 memcpy(cache->vertices, vertexCoordinateArray.data(), floatSizeInBytes);
-                cache->indices = 0;
+                cache->indices = nullptr;
 #endif
             }
 
@@ -1359,7 +1359,7 @@ void QOpenGL2PaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
         return;
 
     QOpenGL2PaintEngineState *s = state();
-    if (qt_pen_is_cosmetic(pen, state()->renderHints) && !qt_scaleForTransform(s->transform(), 0)) {
+    if (qt_pen_is_cosmetic(pen, state()->renderHints) && !qt_scaleForTransform(s->transform(), nullptr)) {
         // QTriangulatingStroker class is not meant to support cosmetically sheared strokes.
         QPaintEngineEx::stroke(path, pen);
         return;
@@ -1427,7 +1427,7 @@ void QOpenGL2PaintEngineExPrivate::stroke(const QVectorPath &path, const QPen &p
         QRectF bounds = path.controlPointRect().adjusted(-extra, -extra, extra, extra);
 
         fillStencilWithVertexArray(stroker.vertices(), stroker.vertexCount() / 2,
-                                      0, 0, bounds, QOpenGL2PaintEngineExPrivate::TriStripStrokeFillMode);
+                                      nullptr, 0, bounds, QOpenGL2PaintEngineExPrivate::TriStripStrokeFillMode);
 
         funcs.glStencilOp(GL_KEEP, GL_REPLACE, GL_REPLACE);
 
@@ -1772,7 +1772,7 @@ void QOpenGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngine::GlyphFormat gly
 
     QOpenGLTextureGlyphCache *cache =
             (QOpenGLTextureGlyphCache *) fe->glyphCache(cacheKey, glyphFormat, glyphCacheTransform);
-    if (!cache || cache->glyphFormat() != glyphFormat || cache->contextGroup() == 0) {
+    if (!cache || cache->glyphFormat() != glyphFormat || cache->contextGroup() == nullptr) {
         cache = new QOpenGLTextureGlyphCache(glyphFormat, glyphCacheTransform);
         fe->setGlyphCache(cacheKey, cache);
         recreateVertexArrays = true;
@@ -1780,7 +1780,7 @@ void QOpenGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngine::GlyphFormat gly
 
     if (staticTextItem->userDataNeedsUpdate) {
         recreateVertexArrays = true;
-    } else if (staticTextItem->userData() == 0) {
+    } else if (staticTextItem->userData() == nullptr) {
         recreateVertexArrays = true;
     } else if (staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
         recreateVertexArrays = true;
@@ -1845,9 +1845,9 @@ void QOpenGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngine::GlyphFormat gly
     QOpenGL2PEXVertexArray *textureCoordinates = &textureCoordinateArray;
 
     if (staticTextItem->useBackendOptimizations) {
-        QOpenGLStaticTextUserData *userData = 0;
+        QOpenGLStaticTextUserData *userData = nullptr;
 
-        if (staticTextItem->userData() == 0
+        if (staticTextItem->userData() == nullptr
             || staticTextItem->userData()->type != QStaticTextUserData::OpenGLUserData) {
 
             userData = new QOpenGLStaticTextUserData();
@@ -2273,12 +2273,12 @@ bool QOpenGL2PaintEngineEx::end()
     d->funcs.glUseProgram(0);
     d->transferMode(BrushDrawingMode);
 
-    ctx->d_func()->active_engine = 0;
+    ctx->d_func()->active_engine = nullptr;
 
     d->resetGLState();
 
     delete d->shaderManager;
-    d->shaderManager = 0;
+    d->shaderManager = nullptr;
     d->currentBrush = QBrush();
 
 #ifdef QT_OPENGL_CACHE_AS_VBOS
diff --git a/src/gui/opengl/qopenglshaderprogram.cpp b/src/gui/opengl/qopenglshaderprogram.cpp
index 4986ca573d..7e89d9c8d4 100644
--- a/src/gui/opengl/qopenglshaderprogram.cpp
+++ b/src/gui/opengl/qopenglshaderprogram.cpp
@@ -249,7 +249,7 @@ class QOpenGLShaderPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QOpenGLShader)
 public:
     QOpenGLShaderPrivate(QOpenGLContext *ctx, QOpenGLShader::ShaderType type)
-        : shaderGuard(0)
+        : shaderGuard(nullptr)
         , shaderType(type)
         , compiled(false)
         , glfuncs(new QOpenGLExtraFunctions(ctx))
@@ -374,8 +374,8 @@ bool QOpenGLShaderPrivate::compile(QOpenGLShader *q)
         // Get info and source code lengths
         GLint infoLogLength = 0;
         GLint sourceCodeLength = 0;
-        char *logBuffer = 0;
-        char *sourceCodeBuffer = 0;
+        char *logBuffer = nullptr;
+        char *sourceCodeBuffer = nullptr;
 
         // Get the compilation info log
         glfuncs->glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);
@@ -425,7 +425,7 @@ void QOpenGLShaderPrivate::deleteShader()
 {
     if (shaderGuard) {
         shaderGuard->free();
-        shaderGuard = 0;
+        shaderGuard = nullptr;
     }
 }
 
@@ -783,13 +783,13 @@ class QOpenGLShaderProgramPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QOpenGLShaderProgram)
 public:
     QOpenGLShaderProgramPrivate()
-        : programGuard(0)
+        : programGuard(nullptr)
         , linked(false)
         , inited(false)
         , removingShaders(false)
         , glfuncs(new QOpenGLExtraFunctions)
 #ifndef QT_OPENGL_ES_2
-        , tessellationFuncs(0)
+        , tessellationFuncs(nullptr)
 #endif
         , linkBinaryRecursion(false)
     {
diff --git a/src/gui/opengl/qopengltexture.cpp b/src/gui/opengl/qopengltexture.cpp
index 61a6202017..cf4a8dee8d 100644
--- a/src/gui/opengl/qopengltexture.cpp
+++ b/src/gui/opengl/qopengltexture.cpp
@@ -57,7 +57,7 @@ QT_BEGIN_NAMESPACE
 QOpenGLTexturePrivate::QOpenGLTexturePrivate(QOpenGLTexture::Target textureTarget,
                                              QOpenGLTexture *qq)
     : q_ptr(qq),
-      context(0),
+      context(nullptr),
       target(textureTarget),
       textureId(0),
       format(QOpenGLTexture::NoFormat),
@@ -82,8 +82,8 @@ QOpenGLTexturePrivate::QOpenGLTexturePrivate(QOpenGLTexture::Target textureTarge
       textureView(false),
       autoGenerateMipMaps(true),
       storageAllocated(false),
-      texFuncs(0),
-      functions(0)
+      texFuncs(nullptr),
+      functions(nullptr)
 {
     dimensions[0] = dimensions[1] = dimensions[2] = 1;
 
@@ -208,8 +208,8 @@ void QOpenGLTexturePrivate::destroy()
 
     functions->glDeleteTextures(1, &textureId);
 
-    context = 0;
-    functions = 0;
+    context = nullptr;
+    functions = nullptr;
     textureId = 0;
     format = QOpenGLTexture::NoFormat;
     formatClass = QOpenGLTexture::NoFormatClass;
@@ -231,7 +231,7 @@ void QOpenGLTexturePrivate::destroy()
     textureView = false;
     autoGenerateMipMaps = true;
     storageAllocated = false;
-    texFuncs = 0;
+    texFuncs = nullptr;
 
     swizzleMask[0] = QOpenGLTexture::RedValue;
     swizzleMask[1] = QOpenGLTexture::GreenValue;
@@ -1141,7 +1141,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                 texFuncs->glTextureImage1D(textureId, target, bindingTarget, level, format,
                                            mipLevelSize(level, dimensions[0]),
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
         } else {
             qWarning("1D textures are not supported");
             return;
@@ -1156,7 +1156,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                            mipLevelSize(level, dimensions[0]),
                                            layers,
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
         } else {
             qWarning("1D array textures are not supported");
             return;
@@ -1170,7 +1170,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                        mipLevelSize(level, dimensions[0]),
                                        mipLevelSize(level, dimensions[1]),
                                        0,
-                                       pixelFormat, pixelType, 0);
+                                       pixelFormat, pixelType, nullptr);
         break;
 
     case QOpenGLTexture::TargetCubeMap: {
@@ -1190,7 +1190,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                            mipLevelSize(level, dimensions[0]),
                                            mipLevelSize(level, dimensions[1]),
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
             }
         }
         break;
@@ -1204,7 +1204,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                            mipLevelSize(level, dimensions[1]),
                                            layers,
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
         } else {
             qWarning("Array textures are not supported");
             return;
@@ -1220,7 +1220,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                            mipLevelSize(level, dimensions[1]),
                                            6 * layers,
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
         } else {
             qWarning("Cubemap Array textures are not supported");
             return;
@@ -1235,7 +1235,7 @@ void QOpenGLTexturePrivate::allocateMutableStorage(QOpenGLTexture::PixelFormat p
                                            mipLevelSize(level, dimensions[1]),
                                            mipLevelSize(level, dimensions[2]),
                                            0,
-                                           pixelFormat, pixelType, 0);
+                                           pixelFormat, pixelType, nullptr);
         } else {
             qWarning("3D textures are not supported");
             return;
@@ -1924,7 +1924,7 @@ QOpenGLTexture *QOpenGLTexturePrivate::createTextureView(QOpenGLTexture::Target
 
     if (!viewTargetCompatible) {
         qWarning("QOpenGLTexture::createTextureView(): Incompatible source and view targets");
-        return 0;
+        return nullptr;
     }
 
     // Check the formats are compatible
@@ -2057,7 +2057,7 @@ QOpenGLTexture *QOpenGLTexturePrivate::createTextureView(QOpenGLTexture::Target
 
     if (!viewFormatCompatible) {
         qWarning("QOpenGLTexture::createTextureView(): Incompatible source and view formats");
-        return 0;
+        return nullptr;
     }
 
 
@@ -3387,7 +3387,7 @@ QOpenGLTexture *QOpenGLTexture::createTextureView(Target target,
     Q_D(const QOpenGLTexture);
     if (!isStorageAllocated()) {
         qWarning("Cannot set create a texture view of a texture that does not have storage allocated.");
-        return 0;
+        return nullptr;
     }
     Q_ASSERT(maximumMipmapLevel >= minimumMipmapLevel);
     Q_ASSERT(maximumLayer >= minimumLayer);
diff --git a/src/gui/opengl/qopengltextureglyphcache.cpp b/src/gui/opengl/qopengltextureglyphcache.cpp
index 490dc99749..41027d26e0 100644
--- a/src/gui/opengl/qopengltextureglyphcache.cpp
+++ b/src/gui/opengl/qopengltextureglyphcache.cpp
@@ -55,9 +55,9 @@ static int next_qopengltextureglyphcache_serial_number()
 
 QOpenGLTextureGlyphCache::QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix, const QColor &color)
     : QImageTextureGlyphCache(format, matrix, color)
-    , m_textureResource(0)
-    , pex(0)
-    , m_blitProgram(0)
+    , m_textureResource(nullptr)
+    , pex(nullptr)
+    , m_blitProgram(nullptr)
     , m_filterMode(Nearest)
     , m_serialNumber(next_qopengltextureglyphcache_serial_number())
     , m_buffer(QOpenGLBuffer::VertexBuffer)
@@ -102,7 +102,7 @@ static inline bool isCoreProfile()
 void QOpenGLTextureGlyphCache::createTextureData(int width, int height)
 {
     QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
-    if (ctx == 0) {
+    if (ctx == nullptr) {
         qWarning("QOpenGLTextureGlyphCache::createTextureData: Called with no context");
         return;
     }
@@ -121,7 +121,7 @@ void QOpenGLTextureGlyphCache::createTextureData(int width, int height)
 
     if (m_textureResource && !m_textureResource->m_texture) {
         delete m_textureResource;
-        m_textureResource = 0;
+        m_textureResource = nullptr;
     }
 
     if (!m_textureResource)
@@ -276,7 +276,7 @@ static void load_glyph_image_region_to_texture(QOpenGLContext *ctx,
 void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
 {
     QOpenGLContext *ctx = QOpenGLContext::currentContext();
-    if (ctx == 0) {
+    if (ctx == nullptr) {
         qWarning("QOpenGLTextureGlyphCache::resizeTextureData: Called with no context");
         return;
     }
@@ -313,7 +313,7 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
     funcs->glGenTextures(1, &tmp_texture);
     funcs->glBindTexture(GL_TEXTURE_2D, tmp_texture);
     funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
-                        GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+                        GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
     funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
@@ -326,7 +326,7 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
     funcs->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
     funcs->glBindTexture(GL_TEXTURE_2D, oldTexture);
 
-    if (pex != 0)
+    if (pex != nullptr)
         pex->transferMode(BrushDrawingMode);
 
     funcs->glDisable(GL_STENCIL_TEST);
@@ -336,9 +336,9 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
 
     funcs->glViewport(0, 0, oldWidth, oldHeight);
 
-    QOpenGLShaderProgram *blitProgram = 0;
-    if (pex == 0) {
-        if (m_blitProgram == 0) {
+    QOpenGLShaderProgram *blitProgram = nullptr;
+    if (pex == nullptr) {
+        if (m_blitProgram == nullptr) {
             m_blitProgram = new QOpenGLShaderProgram;
             const bool isCoreProfile = ctx->format().profile() == QSurfaceFormat::CoreProfile;
 
@@ -408,7 +408,7 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
 
     funcs->glBindFramebuffer(GL_FRAMEBUFFER, (GLuint)oldFbo);
 
-    if (pex != 0) {
+    if (pex != nullptr) {
         funcs->glViewport(0, 0, pex->width, pex->height);
         pex->updateClipScissorTest();
     } else {
@@ -424,7 +424,7 @@ void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
 void QOpenGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition)
 {
     QOpenGLContext *ctx = QOpenGLContext::currentContext();
-    if (ctx == 0) {
+    if (ctx == nullptr) {
         qWarning("QOpenGLTextureGlyphCache::fillTexture: Called with no context");
         return;
     }
@@ -447,7 +447,7 @@ int QOpenGLTextureGlyphCache::glyphPadding() const
 int QOpenGLTextureGlyphCache::maxTextureWidth() const
 {
     QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
-    if (ctx == 0)
+    if (ctx == nullptr)
         return QImageTextureGlyphCache::maxTextureWidth();
     else
         return ctx->d_func()->maxTextureSize();
@@ -456,7 +456,7 @@ int QOpenGLTextureGlyphCache::maxTextureWidth() const
 int QOpenGLTextureGlyphCache::maxTextureHeight() const
 {
     QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
-    if (ctx == 0)
+    if (ctx == nullptr)
         return QImageTextureGlyphCache::maxTextureHeight();
 
     if (ctx->d_func()->workaround_brokenTexSubImage)
@@ -469,10 +469,10 @@ void QOpenGLTextureGlyphCache::clear()
 {
     if (m_textureResource)
         m_textureResource->free();
-    m_textureResource = 0;
+    m_textureResource = nullptr;
 
     delete m_blitProgram;
-    m_blitProgram = 0;
+    m_blitProgram = nullptr;
 
     m_w = 0;
     m_h = 0;
diff --git a/src/gui/opengl/qopengltimerquery.cpp b/src/gui/opengl/qopengltimerquery.cpp
index afd2e7887a..a4e10b42f7 100644
--- a/src/gui/opengl/qopengltimerquery.cpp
+++ b/src/gui/opengl/qopengltimerquery.cpp
@@ -77,8 +77,8 @@ class QOpenGLTimerQueryPrivate : public QObjectPrivate
 public:
     QOpenGLTimerQueryPrivate()
         : QObjectPrivate(),
-          context(0),
-          ext(0),
+          context(nullptr),
+          ext(nullptr),
           timeInterval(0),
           timer(0)
     {
@@ -168,7 +168,7 @@ void QOpenGLTimerQueryPrivate::destroy()
 
     core->glDeleteQueries(1, &timer);
     timer = 0;
-    context = 0;
+    context = nullptr;
 }
 
 // GL_TIME_ELAPSED_EXT is not defined on OS X 10.6
@@ -310,14 +310,14 @@ QOpenGLTimerQuery::~QOpenGLTimerQuery()
     QOpenGLContext* ctx = QOpenGLContext::currentContext();
 
     Q_D(QOpenGLTimerQuery);
-    QOpenGLContext *oldContext = 0;
+    QOpenGLContext *oldContext = nullptr;
     if (d->context != ctx) {
         oldContext = ctx;
         if (d->context->makeCurrent(oldContext->surface())) {
             ctx = d->context;
         } else {
             qWarning("QOpenGLTimerQuery::~QOpenGLTimerQuery() failed to make query objects's context current");
-            ctx = 0;
+            ctx = nullptr;
         }
     }
 
@@ -468,9 +468,9 @@ public:
         : QObjectPrivate(),
           timers(),
           timeSamples(),
-          context(0),
-          core(0),
-          ext(0),
+          context(nullptr),
+          core(nullptr),
+          ext(nullptr),
           requestedSampleCount(2),
           currentSample(-1),
           timerQueryActive(false)
@@ -556,10 +556,10 @@ void QOpenGLTimeMonitorPrivate::destroy()
     core->glDeleteQueries(timers.size(), timers.data());
     timers.clear();
     delete core;
-    core = 0;
+    core = nullptr;
     delete ext;
-    ext = 0;
-    context = 0;
+    ext = nullptr;
+    context = nullptr;
 }
 
 void QOpenGLTimeMonitorPrivate::recordSample()
@@ -701,14 +701,14 @@ QOpenGLTimeMonitor::~QOpenGLTimeMonitor()
     QOpenGLContext* ctx = QOpenGLContext::currentContext();
 
     Q_D(QOpenGLTimeMonitor);
-    QOpenGLContext *oldContext = 0;
+    QOpenGLContext *oldContext = nullptr;
     if (d->context != ctx) {
         oldContext = ctx;
         if (d->context->makeCurrent(oldContext->surface())) {
             ctx = d->context;
         } else {
             qWarning("QOpenGLTimeMonitor::~QOpenGLTimeMonitor() failed to make time monitor's context current");
-            ctx = 0;
+            ctx = nullptr;
         }
     }
 
diff --git a/src/gui/opengl/qopenglversionfunctions.cpp b/src/gui/opengl/qopenglversionfunctions.cpp
index a3d3bb6bd1..5a108335a9 100644
--- a/src/gui/opengl/qopenglversionfunctions.cpp
+++ b/src/gui/opengl/qopenglversionfunctions.cpp
@@ -68,7 +68,7 @@ void CLASS::init() \
 }
 
 QOpenGLVersionFunctionsStorage::QOpenGLVersionFunctionsStorage()
-    : backends(0)
+    : backends(nullptr)
 {
 }
 
diff --git a/src/gui/opengl/qopenglversionfunctionsfactory.cpp b/src/gui/opengl/qopenglversionfunctionsfactory.cpp
index fff5eea29c..ca7daedf34 100644
--- a/src/gui/opengl/qopenglversionfunctionsfactory.cpp
+++ b/src/gui/opengl/qopenglversionfunctionsfactory.cpp
@@ -153,7 +153,7 @@ QAbstractOpenGLFunctions *QOpenGLVersionFunctionsFactory::create(const QOpenGLVe
         else if (major == 1 && minor == 0)
             return new QOpenGLFunctions_1_0;
     }
-    return 0;
+    return nullptr;
 #else
     Q_UNUSED(versionProfile);
     return new QOpenGLFunctions_ES2;
diff --git a/src/gui/opengl/qopenglvertexarrayobject.cpp b/src/gui/opengl/qopenglvertexarrayobject.cpp
index f0837aff96..f15fe06ee8 100644
--- a/src/gui/opengl/qopenglvertexarrayobject.cpp
+++ b/src/gui/opengl/qopenglvertexarrayobject.cpp
@@ -101,7 +101,7 @@ public:
     QOpenGLVertexArrayObjectPrivate()
         : vao(0)
         , vaoFuncsType(NotSupported)
-        , context(0)
+        , context(nullptr)
     {
     }
 
@@ -167,7 +167,7 @@ bool QOpenGLVertexArrayObjectPrivate::create()
             vaoFuncs.helper->glGenVertexArrays(1, &vao);
         }
     } else {
-        vaoFuncs.core_3_0 = 0;
+        vaoFuncs.core_3_0 = nullptr;
         vaoFuncsType = NotSupported;
         QSurfaceFormat format = ctx->format();
 #ifndef QT_OPENGL_ES_2
@@ -200,17 +200,17 @@ void QOpenGLVertexArrayObjectPrivate::destroy()
     Q_Q(QOpenGLVertexArrayObject);
 
     QOpenGLContext *ctx = QOpenGLContext::currentContext();
-    QOpenGLContext *oldContext = 0;
-    QSurface *oldContextSurface = 0;
+    QOpenGLContext *oldContext = nullptr;
+    QSurface *oldContextSurface = nullptr;
     QScopedPointer<QOffscreenSurface> offscreenSurface;
     if (context && context != ctx) {
         oldContext = ctx;
-        oldContextSurface = ctx ? ctx->surface() : 0;
+        oldContextSurface = ctx ? ctx->surface() : nullptr;
         // Before going through the effort of creating an offscreen surface
         // check that we are on the GUI thread because otherwise many platforms
         // will not able to create that offscreen surface.
         if (QThread::currentThread() != qGuiApp->thread()) {
-            ctx = 0;
+            ctx = nullptr;
         } else {
             // Cannot just make the current surface current again with another context.
             // The format may be incompatible and some platforms (iOS) may impose
@@ -223,14 +223,14 @@ void QOpenGLVertexArrayObjectPrivate::destroy()
                 ctx = context;
             } else {
                 qWarning("QOpenGLVertexArrayObject::destroy() failed to make VAO's context current");
-                ctx = 0;
+                ctx = nullptr;
             }
         }
     }
 
     if (context) {
         QObject::disconnect(context, SIGNAL(aboutToBeDestroyed()), q, SLOT(_q_contextAboutToBeDestroyed()));
-        context = 0;
+        context = nullptr;
     }
 
     if (vao && ctx) {
diff --git a/src/gui/painting/qblittable.cpp b/src/gui/painting/qblittable.cpp
index 8e2013c24f..494104251f 100644
--- a/src/gui/painting/qblittable.cpp
+++ b/src/gui/painting/qblittable.cpp
@@ -46,7 +46,7 @@ class QBlittablePrivate
 {
 public:
     QBlittablePrivate(const QSize &size, QBlittable::Capabilities caps)
-        : caps(caps), m_size(size), locked(false), cachedImg(0)
+        : caps(caps), m_size(size), locked(false), cachedImg(nullptr)
     {}
     QBlittable::Capabilities caps;
     QSize m_size;
diff --git a/src/gui/painting/qbrush.cpp b/src/gui/painting/qbrush.cpp
index abb3268dfa..b23fb45952 100644
--- a/src/gui/painting/qbrush.cpp
+++ b/src/gui/painting/qbrush.cpp
@@ -179,7 +179,7 @@ struct QTexturedBrushData : public QBrushData
 {
     QTexturedBrushData() {
         m_has_pixmap_texture = false;
-        m_pixmap = 0;
+        m_pixmap = nullptr;
     }
     ~QTexturedBrushData() {
         delete m_pixmap;
@@ -189,7 +189,7 @@ struct QTexturedBrushData : public QBrushData
         delete m_pixmap;
 
         if (pm.isNull()) {
-            m_pixmap = 0;
+            m_pixmap = nullptr;
             m_has_pixmap_texture = false;
         } else {
             m_pixmap = new QPixmap(pm);
@@ -202,7 +202,7 @@ struct QTexturedBrushData : public QBrushData
     void setImage(const QImage &image) {
         m_image = image;
         delete m_pixmap;
-        m_pixmap = 0;
+        m_pixmap = nullptr;
         m_has_pixmap_texture = false;
     }
 
@@ -360,7 +360,7 @@ public:
     {
         if (!brush->ref.deref())
             delete brush;
-        brush = 0;
+        brush = nullptr;
     }
 };
 
@@ -831,7 +831,7 @@ const QGradient *QBrush::gradient() const
         || d->style == Qt::ConicalGradientPattern) {
         return &static_cast<const QGradientBrushData *>(d.data())->gradient;
     }
-    return 0;
+    return nullptr;
 }
 
 Q_GUI_EXPORT bool qt_isExtendedRadialGradient(const QBrush &brush)
@@ -968,7 +968,7 @@ bool QBrush::operator==(const QBrush &b) const
             // but does not share the same data in memory. Since equality is likely to
             // be used to avoid iterating over the data for a texture update, this should
             // still be better than doing an accurate comparison.
-            const QPixmap *us = 0, *them = 0;
+            const QPixmap *us = nullptr, *them = nullptr;
             qint64 cacheKey1, cacheKey2;
             if (qHasPixmapTexture(*this)) {
                 us = (static_cast<QTexturedBrushData *>(d.data()))->m_pixmap;
@@ -1335,7 +1335,7 @@ QDataStream &operator>>(QDataStream &s, QBrush &b)
     \internal
 */
 QGradient::QGradient()
-    : m_type(NoGradient), dummy(0)
+    : m_type(NoGradient), dummy(nullptr)
 {
 }
 
diff --git a/src/gui/painting/qcosmeticstroker.cpp b/src/gui/painting/qcosmeticstroker.cpp
index 0fb89a75b5..bece814a6f 100644
--- a/src/gui/painting/qcosmeticstroker.cpp
+++ b/src/gui/painting/qcosmeticstroker.cpp
@@ -225,7 +225,7 @@ static StrokeLine strokeLine(int strokeSelection)
         break;
     default:
         Q_ASSERT(false);
-        stroke = 0;
+        stroke = nullptr;
     }
     return stroke;
 }
@@ -252,8 +252,8 @@ void QCosmeticStroker::setup()
     const QVector<qreal> &penPattern = state->lastPen.dashPattern();
     if (penPattern.isEmpty()) {
         Q_ASSERT(!pattern && !reversePattern);
-        pattern = 0;
-        reversePattern = 0;
+        pattern = nullptr;
+        reversePattern = nullptr;
         patternLength = 0;
         patternSize = 0;
     } else {
diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index e8d129d047..6819545bda 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -310,7 +310,7 @@ inline void QT_FASTCALL storePixel<QPixelLayout::BPP24>(uchar *dest, int index,
 typedef uint (QT_FASTCALL *FetchPixelFunc)(const uchar *src, int index);
 
 static const FetchPixelFunc qFetchPixel[QPixelLayout::BPPCount] = {
-    0, // BPPNone
+    nullptr, // BPPNone
     fetchPixel<QPixelLayout::BPP1MSB>, // BPP1MSB
     fetchPixel<QPixelLayout::BPP1LSB>, // BPP1LSB
     fetchPixel<QPixelLayout::BPP8>, // BPP8
@@ -1713,10 +1713,10 @@ static uint *QT_FASTCALL destFetchUndefined(uint *buffer, QRasterBuffer *, int,
 
 static DestFetchProc destFetchProc[QImage::NImageFormats] =
 {
-    0,                  // Format_Invalid
+    nullptr,            // Format_Invalid
     destFetchMono,      // Format_Mono,
     destFetchMonoLsb,   // Format_MonoLSB
-    0,                  // Format_Indexed8
+    nullptr,            // Format_Indexed8
     destFetchARGB32P,   // Format_RGB32
     destFetch,          // Format_ARGB32,
     destFetchARGB32P,   // Format_ARGB32_Premultiplied
@@ -1764,10 +1764,10 @@ static QRgba64 * QT_FASTCALL destFetch64Undefined(QRgba64 *buffer, QRasterBuffer
 
 static DestFetchProc64 destFetchProc64[QImage::NImageFormats] =
 {
-    0,                  // Format_Invalid
-    0,                  // Format_Mono,
-    0,                  // Format_MonoLSB
-    0,                  // Format_Indexed8
+    nullptr,            // Format_Invalid
+    nullptr,            // Format_Mono,
+    nullptr,            // Format_MonoLSB
+    nullptr,            // Format_Indexed8
     destFetch64,        // Format_RGB32
     destFetch64,        // Format_ARGB32,
     destFetch64,        // Format_ARGB32_Premultiplied
@@ -1905,13 +1905,13 @@ static void QT_FASTCALL destStore(QRasterBuffer *rasterBuffer, int x, int y, con
 
 static DestStoreProc destStoreProc[QImage::NImageFormats] =
 {
-    0,                  // Format_Invalid
+    nullptr,            // Format_Invalid
     destStoreMono,      // Format_Mono,
     destStoreMonoLsb,   // Format_MonoLSB
-    0,                  // Format_Indexed8
-    0,                  // Format_RGB32
+    nullptr,            // Format_Indexed8
+    nullptr,            // Format_RGB32
     destStore,          // Format_ARGB32,
-    0,                  // Format_ARGB32_Premultiplied
+    nullptr,            // Format_ARGB32_Premultiplied
     destStoreRGB16,     // Format_RGB16
     destStore,          // Format_ARGB8565_Premultiplied
     destStore,          // Format_RGB666
@@ -1955,10 +1955,10 @@ static void QT_FASTCALL destStore64RGBA64(QRasterBuffer *rasterBuffer, int x, in
 
 static DestStoreProc64 destStoreProc64[QImage::NImageFormats] =
 {
-    0,                  // Format_Invalid
-    0,                  // Format_Mono,
-    0,                  // Format_MonoLSB
-    0,                  // Format_Indexed8
+    nullptr,            // Format_Invalid
+    nullptr,            // Format_Mono,
+    nullptr,            // Format_MonoLSB
+    nullptr,            // Format_Indexed8
     destStore64,        // Format_RGB32
     destStore64,        // Format_ARGB32,
     destStore64,        // Format_ARGB32_Premultiplied
@@ -1980,9 +1980,9 @@ static DestStoreProc64 destStoreProc64[QImage::NImageFormats] =
     destStore64,        // Format_A2RGB30_Premultiplied
     destStore64,        // Format_Alpha8
     destStore64,        // Format_Grayscale8
-    0,                  // Format_RGBX64
+    nullptr,            // Format_RGBX64
     destStore64RGBA64,  // Format_RGBA64
-    0,                  // Format_RGBA64_Premultiplied
+    nullptr,            // Format_RGBA64_Premultiplied
     destStore64,        // Format_Grayscale16
     destStore64,        // Format_BGR888
 };
@@ -3627,9 +3627,9 @@ static const QRgba64 *QT_FASTCALL fetchTransformedBilinear64_uint32(QRgba64 *buf
 #endif
                 fetcher(sbuf1, sbuf2, len, data->texture, fx, fy, fdx, fdy);
 
-                layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, 0);
+                layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, nullptr);
                 if (disty)
-                    layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, 0);
+                    layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, nullptr);
 
                 for (int i = 0; i < len; ++i) {
                     int distx = (fx & 0x0000ffff);
@@ -3662,8 +3662,8 @@ static const QRgba64 *QT_FASTCALL fetchTransformedBilinear64_uint32(QRgba64 *buf
 
                 fetcher(sbuf1, sbuf2, len, data->texture, fx, fy, fdx, fdy);
 
-                layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, 0);
-                layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, 0);
+                layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, nullptr);
+                layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, nullptr);
 
                 for (int i = 0; i < len; ++i) {
                     int distx = (fx & 0x0000ffff);
@@ -3727,8 +3727,8 @@ static const QRgba64 *QT_FASTCALL fetchTransformedBilinear64_uint32(QRgba64 *buf
                     fw += fdw;
             }
 
-            layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, 0);
-            layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, 0);
+            layout->convertToRGBA64PM(buf1, sbuf1, len * 2, clut, nullptr);
+            layout->convertToRGBA64PM(buf2, sbuf2, len * 2, clut, nullptr);
 
             for (int i = 0; i < len; ++i) {
                 int distx = distxs[i];
@@ -3907,7 +3907,7 @@ static const QRgba64 *QT_FASTCALL fetchTransformedBilinear64(QRgba64 *buffer, co
 
 // FetchUntransformed can have more specialized methods added depending on SIMD features.
 static SourceFetchProc sourceFetchUntransformed[QImage::NImageFormats] = {
-    0,                          // Invalid
+    nullptr,                    // Invalid
     fetchUntransformed,         // Mono
     fetchUntransformed,         // MonoLsb
     fetchUntransformed,         // Indexed8
@@ -4348,9 +4348,9 @@ static inline Operator getOperator(const QSpanData *data, const QSpan *spans, in
     switch(data->type) {
     case QSpanData::Solid:
         solidSource = data->solidColor.isOpaque();
-        op.srcFetch = 0;
+        op.srcFetch = nullptr;
 #if QT_CONFIG(raster_64bit)
-        op.srcFetch64 = 0;
+        op.srcFetch64 = nullptr;
 #endif
         break;
     case QSpanData::LinearGradient:
@@ -4721,7 +4721,7 @@ struct QBlendBase
     QBlendBase(QSpanData *d, const Operator &o)
         : data(d)
         , op(o)
-        , dest(0)
+        , dest(nullptr)
     {
     }
 
@@ -6397,21 +6397,21 @@ static void qt_rectfill_quint64(QRasterBuffer *rasterBuffer,
 DrawHelper qDrawHelper[QImage::NImageFormats] =
 {
     // Format_Invalid,
-    { 0, 0, 0, 0, 0 },
+    { nullptr, nullptr, nullptr, nullptr, nullptr },
     // Format_Mono,
     {
         blend_color_generic,
-        0, 0, 0, 0
+        nullptr, nullptr, nullptr, nullptr
     },
     // Format_MonoLSB,
     {
         blend_color_generic,
-        0, 0, 0, 0
+        nullptr, nullptr, nullptr, nullptr
     },
     // Format_Indexed8,
     {
         blend_color_generic,
-        0, 0, 0, 0
+        nullptr, nullptr, nullptr, nullptr
     },
     // Format_RGB32,
     {
@@ -6448,7 +6448,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_ARGB8565_Premultiplied
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
@@ -6456,7 +6456,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGB666
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
@@ -6464,7 +6464,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_ARGB6666_Premultiplied
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
@@ -6472,7 +6472,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGB555
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint16
@@ -6480,7 +6480,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_ARGB8555_Premultiplied
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
@@ -6488,7 +6488,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGB888
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
@@ -6496,7 +6496,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGB444
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint16
@@ -6504,7 +6504,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_ARGB4444_Premultiplied
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint16
@@ -6568,7 +6568,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_Alpha8
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_alpha
@@ -6576,7 +6576,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_Grayscale8
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_gray
@@ -6584,7 +6584,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGBX64
     {
         blend_color_generic_rgb64,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint64
@@ -6592,7 +6592,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGBA64
     {
         blend_color_generic_rgb64,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint64
@@ -6600,7 +6600,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_RGBA64_Premultiplied
     {
         blend_color_generic_rgb64,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint64
@@ -6608,7 +6608,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_Grayscale16
     {
         blend_color_generic_rgb64,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint16
@@ -6616,7 +6616,7 @@ DrawHelper qDrawHelper[QImage::NImageFormats] =
     // Format_BGR888
     {
         blend_color_generic,
-        0,
+        nullptr,
         qt_alphamapblit_generic,
         qt_alphargbblit_generic,
         qt_rectfill_quint24
diff --git a/src/gui/painting/qemulationpaintengine.cpp b/src/gui/painting/qemulationpaintengine.cpp
index 0c0df0fb13..7cd700a84a 100644
--- a/src/gui/painting/qemulationpaintengine.cpp
+++ b/src/gui/painting/qemulationpaintengine.cpp
@@ -271,7 +271,7 @@ void QEmulationPaintEngine::fillBGRect(const QRectF &r)
 {
     qreal pts[] = { r.x(), r.y(), r.x() + r.width(), r.y(),
                     r.x() + r.width(), r.y() + r.height(), r.x(), r.y() + r.height() };
-    QVectorPath vp(pts, 4, 0, QVectorPath::RectangleHint);
+    QVectorPath vp(pts, 4, nullptr, QVectorPath::RectangleHint);
     real_engine->fill(vp, state()->bgBrush);
 }
 
diff --git a/src/gui/painting/qimagescale.cpp b/src/gui/painting/qimagescale.cpp
index 0d7205b483..2e2f65b483 100644
--- a/src/gui/painting/qimagescale.cpp
+++ b/src/gui/painting/qimagescale.cpp
@@ -223,7 +223,7 @@ static QImageScaleInfo* QImageScale::qimageFreeScaleInfo(QImageScaleInfo *isi)
         delete[] isi->yapoints;
         delete isi;
     }
-    return 0;
+    return nullptr;
 }
 
 static QImageScaleInfo* QImageScale::qimageCalcScaleInfo(const QImage &img,
@@ -238,7 +238,7 @@ static QImageScaleInfo* QImageScale::qimageCalcScaleInfo(const QImage &img,
 
     isi = new QImageScaleInfo;
     if (!isi)
-        return 0;
+        return nullptr;
 
     isi->xup_yup = (qAbs(dw) >= sw) + ((qAbs(dh) >= sh) << 1);
 
diff --git a/src/gui/painting/qmemrotate.cpp b/src/gui/painting/qmemrotate.cpp
index 9cb787fb2c..685fbbb37a 100644
--- a/src/gui/painting/qmemrotate.cpp
+++ b/src/gui/painting/qmemrotate.cpp
@@ -406,9 +406,9 @@ void qt_memrotate270_64(const uchar *srcPixels, int w, int h, int sbpl, uchar *d
 MemRotateFunc qMemRotateFunctions[QPixelLayout::BPPCount][3] =
 // 90, 180, 270
 {
-    { 0, 0, 0 },      // BPPNone,
-    { 0, 0, 0 },      // BPP1MSB,
-    { 0, 0, 0 },      // BPP1LSB,
+    { nullptr, nullptr, nullptr },      // BPPNone,
+    { nullptr, nullptr, nullptr },      // BPP1MSB,
+    { nullptr, nullptr, nullptr },      // BPP1LSB,
     { qt_memrotate90_8, qt_memrotate180_8, qt_memrotate270_8 },         // BPP8,
     { qt_memrotate90_16, qt_memrotate180_16, qt_memrotate270_16 },      // BPP16,
     { qt_memrotate90_24, qt_memrotate180_24, qt_memrotate270_24 },      // BPP24
diff --git a/src/gui/painting/qoutlinemapper.cpp b/src/gui/painting/qoutlinemapper.cpp
index 2074f98069..67e450986d 100644
--- a/src/gui/painting/qoutlinemapper.cpp
+++ b/src/gui/painting/qoutlinemapper.cpp
@@ -209,7 +209,7 @@ void QOutlineMapper::endOutline()
             elements[i] = m_transform.map(elements[i]);
     } else {
         const QVectorPath vp((qreal *)elements, m_elements.size(),
-                             m_element_types.size() ? m_element_types.data() : 0);
+                             m_element_types.size() ? m_element_types.data() : nullptr);
         QPainterPath path = vp.convertToPainterPath();
         path = m_transform.map(path);
         if (!(m_outline.flags & QT_FT_OUTLINE_EVEN_ODD_FILL))
diff --git a/src/gui/painting/qpagesize.cpp b/src/gui/painting/qpagesize.cpp
index c98ca8a1fb..d73a66b790 100644
--- a/src/gui/painting/qpagesize.cpp
+++ b/src/gui/painting/qpagesize.cpp
@@ -394,7 +394,7 @@ static QString qt_keyForPageSizeId(QPageSize::PageSizeId id)
 }
 
 // Return id name for PPD Key
-static QPageSize::PageSizeId qt_idForPpdKey(const QString &ppdKey, QSize *match = 0)
+static QPageSize::PageSizeId qt_idForPpdKey(const QString &ppdKey, QSize *match = nullptr)
 {
     if (ppdKey.isEmpty())
         return QPageSize::Custom;
@@ -415,7 +415,7 @@ static QPageSize::PageSizeId qt_idForPpdKey(const QString &ppdKey, QSize *match
 }
 
 // Return id name for Windows ID
-static QPageSize::PageSizeId qt_idForWindowsID(int windowsId, QSize *match = 0)
+static QPageSize::PageSizeId qt_idForWindowsID(int windowsId, QSize *match = nullptr)
 {
     // If outside known values then is Custom
     if (windowsId <= DMPAPER_NONE || windowsId > DMPAPER_LAST)
@@ -770,7 +770,7 @@ QPageSizePrivate::QPageSizePrivate(const QSize &pointSize, const QString &name,
       m_units(QPageSize::Point)
 {
     if (pointSize.isValid()) {
-        QPageSize::PageSizeId id = qt_idForPointSize(pointSize, matchPolicy, 0);
+        QPageSize::PageSizeId id = qt_idForPointSize(pointSize, matchPolicy, nullptr);
         id == QPageSize::Custom ? init(pointSize, name) : init(id, name);
     }
 }
@@ -782,7 +782,7 @@ QPageSizePrivate::QPageSizePrivate(const QSizeF &size, QPageSize::Unit units,
       m_units(QPageSize::Point)
 {
     if (size.isValid()) {
-        QPageSize::PageSizeId id = qt_idForSize(size, units, matchPolicy, 0);
+        QPageSize::PageSizeId id = qt_idForSize(size, units, matchPolicy, nullptr);
         id == QPageSize::Custom ? init(size, units, name) : init(id, name);
     }
 }
@@ -793,10 +793,10 @@ QPageSizePrivate::QPageSizePrivate(const QString &key, const QSize &pointSize, c
       m_units(QPageSize::Point)
 {
     if (!key.isEmpty() && pointSize.isValid()) {
-        QPageSize::PageSizeId id = qt_idForPpdKey(key, 0);
+        QPageSize::PageSizeId id = qt_idForPpdKey(key, nullptr);
         // If not a known PPD key, check if size is a standard PPD size
         if (id == QPageSize::Custom)
-            id = qt_idForPointSize(pointSize, QPageSize::FuzzyMatch, 0);
+            id = qt_idForPointSize(pointSize, QPageSize::FuzzyMatch, nullptr);
         id == QPageSize::Custom ? init(pointSize, name) : init(id, name);
         m_key = key;
     }
@@ -808,10 +808,10 @@ QPageSizePrivate::QPageSizePrivate(int windowsId, const QSize &pointSize, const
       m_units(QPageSize::Point)
 {
     if (windowsId > 0 && pointSize.isValid()) {
-        QPageSize::PageSizeId id = qt_idForWindowsID(windowsId, 0);
+        QPageSize::PageSizeId id = qt_idForWindowsID(windowsId, nullptr);
         // If not a known Windows ID, check if size is a standard PPD size
         if (id == QPageSize::Custom)
-            id = qt_idForPointSize(pointSize, QPageSize::FuzzyMatch, 0);
+            id = qt_idForPointSize(pointSize, QPageSize::FuzzyMatch, nullptr);
         id == QPageSize::Custom ? init(pointSize, name) : init(id, name);
         m_windowsId = windowsId;
     }
@@ -1753,7 +1753,7 @@ QString QPageSize::name(PageSizeId pageSizeId)
 
 QPageSize::PageSizeId QPageSize::id(const QSize &pointSize, SizeMatchPolicy matchPolicy)
 {
-    return qt_idForPointSize(pointSize, matchPolicy, 0);
+    return qt_idForPointSize(pointSize, matchPolicy, nullptr);
 }
 
 /*!
@@ -1769,7 +1769,7 @@ QPageSize::PageSizeId QPageSize::id(const QSize &pointSize, SizeMatchPolicy matc
 QPageSize::PageSizeId QPageSize::id(const QSizeF &size, Unit units,
                                     SizeMatchPolicy matchPolicy)
 {
-    return qt_idForSize(size, units, matchPolicy, 0);
+    return qt_idForSize(size, units, matchPolicy, nullptr);
 }
 
 /*!
diff --git a/src/gui/painting/qpaintdevice.cpp b/src/gui/painting/qpaintdevice.cpp
index 0ddfba6ee9..4afb89b52e 100644
--- a/src/gui/painting/qpaintdevice.cpp
+++ b/src/gui/painting/qpaintdevice.cpp
@@ -43,7 +43,7 @@ QT_BEGIN_NAMESPACE
 
 QPaintDevice::QPaintDevice() noexcept
 {
-    reserved = 0;
+    reserved = nullptr;
     painters = 0;
 }
 
@@ -67,7 +67,7 @@ void QPaintDevice::initPainter(QPainter *) const
 */
 QPaintDevice *QPaintDevice::redirected(QPoint *) const
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -75,7 +75,7 @@ QPaintDevice *QPaintDevice::redirected(QPoint *) const
 */
 QPainter *QPaintDevice::sharedPainter() const
 {
-    return 0;
+    return nullptr;
 }
 
 Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice::PaintDeviceMetric metric)
diff --git a/src/gui/painting/qpaintengine.cpp b/src/gui/painting/qpaintengine.cpp
index bfe1c9cadf..1785fcd12d 100644
--- a/src/gui/painting/qpaintengine.cpp
+++ b/src/gui/painting/qpaintengine.cpp
@@ -305,7 +305,7 @@ void QPaintEngine::syncState()
         static_cast<QPaintEngineEx *>(this)->sync();
 }
 
-static QPaintEngine *qt_polygon_recursion = 0;
+static QPaintEngine *qt_polygon_recursion = nullptr;
 struct QT_Point {
     int x;
     int y;
@@ -334,7 +334,7 @@ void QPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDra
         p[i].y = qRound(points[i].y());
     }
     drawPolygon((QPoint *)p.data(), pointCount, mode);
-    qt_polygon_recursion = 0;
+    qt_polygon_recursion = nullptr;
 }
 
 struct QT_PointF {
@@ -363,7 +363,7 @@ void QPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDraw
         p[i].y = points[i].y();
     }
     drawPolygon((QPointF *)p.data(), pointCount, mode);
-    qt_polygon_recursion = 0;
+    qt_polygon_recursion = nullptr;
 }
 
 /*!
@@ -691,7 +691,7 @@ void QPaintEngine::drawImage(const QRectF &r, const QImage &image, const QRectF
 */
 
 QPaintEngine::QPaintEngine(PaintEngineFeatures caps)
-    : state(0),
+    : state(nullptr),
       gccaps(caps),
       active(0),
       selfDestruct(false),
@@ -706,7 +706,7 @@ QPaintEngine::QPaintEngine(PaintEngineFeatures caps)
 */
 
 QPaintEngine::QPaintEngine(QPaintEnginePrivate &dptr, PaintEngineFeatures caps)
-    : state(0),
+    : state(nullptr),
       gccaps(caps),
       active(0),
       selfDestruct(false),
@@ -728,7 +728,7 @@ QPaintEngine::~QPaintEngine()
 */
 QPainter *QPaintEngine::painter() const
 {
-    return state ? state->painter() : 0;
+    return state ? state->painter() : nullptr;
 }
 
 /*!
diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index 40c822076b..bc65ed56e3 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -115,17 +115,17 @@ public:
         pts[7] = bottom;
     }
     inline QRectVectorPath(const QRect &r)
-        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
+        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
     {
         set(r);
     }
     inline QRectVectorPath(const QRectF &r)
-        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
+        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
     {
         set(r);
     }
     inline QRectVectorPath()
-        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
+        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
     { }
 
     qreal pts[8];
@@ -433,7 +433,7 @@ void QRasterPaintEngine::init()
         break;
     default:
         qWarning("QRasterPaintEngine: unsupported target device %d\n", d->device->devType());
-        d->device = 0;
+        d->device = nullptr;
         return;
     }
 
@@ -601,7 +601,7 @@ QRasterPaintEngineState::~QRasterPaintEngineState()
 
 QRasterPaintEngineState::QRasterPaintEngineState()
 {
-    stroker = 0;
+    stroker = nullptr;
 
     fillFlags = 0;
     strokeFlags = 0;
@@ -621,7 +621,7 @@ QRasterPaintEngineState::QRasterPaintEngineState()
     flags.tx_noshear = true;
     flags.fast_images = true;
 
-    clip = 0;
+    clip = nullptr;
     flags.has_clip_ownership = false;
 
     dirty = 0;
@@ -643,8 +643,8 @@ QRasterPaintEngineState::QRasterPaintEngineState(QRasterPaintEngineState &s)
     , dirty(s.dirty)
     , flag_bits(s.flag_bits)
 {
-    brushData.tempImage = 0;
-    penData.tempImage = 0;
+    brushData.tempImage = nullptr;
+    penData.tempImage = nullptr;
     flags.has_clip_ownership = false;
 }
 
@@ -759,7 +759,7 @@ void QRasterPaintEngine::updatePen(const QPen &pen)
         d->dashStroker->setDashOffset(pen.dashOffset());
         s->stroker = d->dashStroker.data();
     } else {
-        s->stroker = 0;
+        s->stroker = nullptr;
     }
 
     ensureRasterState(); // needed because of tx_noshear...
@@ -1207,7 +1207,7 @@ static void qrasterpaintengine_state_setNoClip(QRasterPaintEngineState *s)
 {
     if (s->flags.has_clip_ownership)
         delete s->clip;
-    s->clip = 0;
+    s->clip = nullptr;
     s->flags.has_clip_ownership = false;
 }
 
@@ -1279,14 +1279,14 @@ void QRasterPaintEngine::clip(const QVectorPath &path, Qt::ClipOperation op)
         // intersect with, in which case we simplify the operation to
         // a replace...
         Qt::ClipOperation isectOp = Qt::IntersectClip;
-        if (base == 0)
+        if (base == nullptr)
             isectOp = Qt::ReplaceClip;
 
         QClipData *newClip = new QClipData(d->rasterBuffer->height());
         newClip->initialize();
         ClipData clipData = { base, newClip, isectOp };
         ensureOutlineMapper();
-        d->rasterize(d->outlineMapper->convertPath(path), qt_span_clip, &clipData, 0);
+        d->rasterize(d->outlineMapper->convertPath(path), qt_span_clip, &clipData, nullptr);
 
         newClip->fixup();
 
@@ -1334,7 +1334,7 @@ bool QRasterPaintEngine::setClipRectInDeviceCoords(const QRect &r, Qt::ClipOpera
     QRect clipRect = qrect_normalized(r) & d->deviceRect;
     QRasterPaintEngineState *s = state();
 
-    if (op == Qt::ReplaceClip || s->clip == 0) {
+    if (op == Qt::ReplaceClip || s->clip == nullptr) {
 
         // No current clip, hence we intersect with sysclip and be
         // done with it...
@@ -1970,7 +1970,7 @@ void QRasterPaintEngine::fillPolygon(const QPointF *points, int pointCount, Poly
     }
 
     // Compose polygon fill..,
-    QVectorPath vp((const qreal *) points, pointCount, 0, QVectorPath::polygonFlags(mode));
+    QVectorPath vp((const qreal *) points, pointCount, nullptr, QVectorPath::polygonFlags(mode));
     ensureOutlineMapper();
     QT_FT_Outline *outline = d->outlineMapper->convertPath(vp);
 
@@ -2011,7 +2011,7 @@ void QRasterPaintEngine::drawPolygon(const QPointF *points, int pointCount, Poly
 
     // Do the outline...
     if (s->penData.blend) {
-        QVectorPath vp((const qreal *) points, pointCount, 0, QVectorPath::polygonFlags(mode));
+        QVectorPath vp((const qreal *) points, pointCount, nullptr, QVectorPath::polygonFlags(mode));
         if (s->flags.fast_pen) {
             QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
             stroker.setLegacyRoundingEnabled(s->flags.legacy_rounding);
@@ -2075,7 +2075,7 @@ void QRasterPaintEngine::drawPolygon(const QPoint *points, int pointCount, Polyg
         QVarLengthArray<qreal> fpoints(count);
         for (int i=0; i<count; ++i)
             fpoints[i] = ((const int *) points)[i];
-        QVectorPath vp((qreal *) fpoints.data(), pointCount, 0, QVectorPath::polygonFlags(mode));
+        QVectorPath vp((qreal *) fpoints.data(), pointCount, nullptr, QVectorPath::polygonFlags(mode));
 
         if (s->flags.fast_pen) {
             QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
@@ -2695,14 +2695,14 @@ void QRasterPaintEngine::alphaPenBlt(const void* src, int bpl, int depth, int rx
             } else if (depth == 8) {
                 if (s->penData.alphamapBlit) {
                     s->penData.alphamapBlit(rb, rx, ry, s->penData.solidColor,
-                                            scanline, w, h, bpl, 0, useGammaCorrection);
+                                            scanline, w, h, bpl, nullptr, useGammaCorrection);
                     return;
                 }
             } else if (depth == 32) {
                 // (A)RGB Alpha mask where the alpha component is not used.
                 if (s->penData.alphaRGBBlit) {
                     s->penData.alphaRGBBlit(rb, rx, ry, s->penData.solidColor,
-                                            (const uint *) scanline, w, h, bpl / 4, 0, useGammaCorrection);
+                                            (const uint *) scanline, w, h, bpl / 4, nullptr, useGammaCorrection);
                     return;
                 }
             }
@@ -2917,10 +2917,10 @@ bool QRasterPaintEngine::drawCachedGlyphs(int numGlyphs, const glyph_t *glyphs,
         QFontEngine::GlyphFormat glyphFormat = fontEngine->glyphFormat != QFontEngine::Format_None ? fontEngine->glyphFormat : d->glyphCacheFormat;
 
         QImageTextureGlyphCache *cache =
-            static_cast<QImageTextureGlyphCache *>(fontEngine->glyphCache(0, glyphFormat, s->matrix, QColor(s->penData.solidColor)));
+            static_cast<QImageTextureGlyphCache *>(fontEngine->glyphCache(nullptr, glyphFormat, s->matrix, QColor(s->penData.solidColor)));
         if (!cache) {
             cache = new QImageTextureGlyphCache(glyphFormat, s->matrix, QColor(s->penData.solidColor));
-            fontEngine->setGlyphCache(0, cache);
+            fontEngine->setGlyphCache(nullptr, cache);
         }
 
         cache->populate(fontEngine, numGlyphs, glyphs, positions);
@@ -3672,7 +3672,7 @@ void QRasterPaintEnginePrivate::rasterize(QT_FT_Outline *outline,
     int rasterPoolSize = MINIMUM_POOL_SIZE;
     uchar rasterPoolOnStack[MINIMUM_POOL_SIZE + 0xf];
     uchar *rasterPoolBase = alignAddress(rasterPoolOnStack, 0xf);
-    uchar *rasterPoolOnHeap = 0;
+    uchar *rasterPoolOnHeap = nullptr;
 
     qt_ft_grays_raster.raster_reset(*grayRaster.data(), rasterPoolBase, rasterPoolSize);
 
@@ -3684,13 +3684,13 @@ void QRasterPaintEnginePrivate::rasterize(QT_FT_Outline *outline,
                             deviceRect.y() + deviceRect.height() };
 
     QT_FT_Raster_Params rasterParams;
-    rasterParams.target = 0;
+    rasterParams.target = nullptr;
     rasterParams.source = outline;
     rasterParams.flags = QT_FT_RASTER_FLAG_CLIP;
-    rasterParams.gray_spans = 0;
-    rasterParams.black_spans = 0;
-    rasterParams.bit_test = 0;
-    rasterParams.bit_set = 0;
+    rasterParams.gray_spans = nullptr;
+    rasterParams.black_spans = nullptr;
+    rasterParams.bit_test = nullptr;
+    rasterParams.bit_set = nullptr;
     rasterParams.user = data;
     rasterParams.clip_box = clip_box;
 
@@ -3843,10 +3843,10 @@ QImage::Format QRasterBuffer::prepare(QImage *image)
 QClipData::QClipData(int height)
 {
     clipSpanHeight = height;
-    m_clipLines = 0;
+    m_clipLines = nullptr;
 
     allocated = 0;
-    m_spans = 0;
+    m_spans = nullptr;
     xmin = xmax = ymin = ymax = 0;
     count = 0;
 
@@ -3890,7 +3890,7 @@ void QClipData::initialize()
                     const int currMaxY = currMinY + rects[firstInBand].height();
 
                     while (y < currMinY) {
-                        m_clipLines[y].spans = 0;
+                        m_clipLines[y].spans = nullptr;
                         m_clipLines[y].count = 0;
                         ++y;
                     }
@@ -3922,7 +3922,7 @@ void QClipData::initialize()
                 Q_ASSERT(count <= allocated);
 
                 while (y < clipSpanHeight) {
-                    m_clipLines[y].spans = 0;
+                    m_clipLines[y].spans = nullptr;
                     m_clipLines[y].count = 0;
                     ++y;
                 }
@@ -3936,7 +3936,7 @@ void QClipData::initialize()
             if (hasRectClip) {
                 int y = 0;
                 while (y < ymin) {
-                    m_clipLines[y].spans = 0;
+                    m_clipLines[y].spans = nullptr;
                     m_clipLines[y].count = 0;
                     ++y;
                 }
@@ -3957,19 +3957,19 @@ void QClipData::initialize()
                 }
 
                 while (y < clipSpanHeight) {
-                    m_clipLines[y].spans = 0;
+                    m_clipLines[y].spans = nullptr;
                     m_clipLines[y].count = 0;
                     ++y;
                 }
             }
         } QT_CATCH(...) {
             free(m_spans); // have to free m_spans again or someone might think that we were successfully initialized.
-            m_spans = 0;
+            m_spans = nullptr;
             QT_RETHROW;
         }
     } QT_CATCH(...) {
         free(m_clipLines); // same for clipLines
-        m_clipLines = 0;
+        m_clipLines = nullptr;
         QT_RETHROW;
     }
 }
@@ -4044,7 +4044,7 @@ void QClipData::setClipRect(const QRect &rect)
 
     if (m_spans) {
         free(m_spans);
-        m_spans = 0;
+        m_spans = nullptr;
     }
 
 //    qDebug() << xmin << xmax << ymin << ymax;
@@ -4074,7 +4074,7 @@ void QClipData::setClipRegion(const QRegion &region)
 
     if (m_spans) {
         free(m_spans);
-        m_spans = 0;
+        m_spans = nullptr;
     }
 
 }
@@ -4532,7 +4532,7 @@ void QSpanData::init(QRasterBuffer *rb, const QRasterPaintEngine *pe)
     bilinear = false;
     m11 = m22 = m33 = 1.;
     m12 = m13 = m21 = m23 = dx = dy = 0.0;
-    clip = pe ? pe->d_func()->clip() : 0;
+    clip = pe ? pe->d_func()->clip() : nullptr;
 }
 
 Q_GUI_EXPORT extern QImage qt_imageForBrush(int brushStyle, bool invert);
@@ -4668,15 +4668,15 @@ void QSpanData::setup(const QBrush &brush, int alpha, QPainter::CompositionMode
 
 void QSpanData::adjustSpanMethods()
 {
-    bitmapBlit = 0;
-    alphamapBlit = 0;
-    alphaRGBBlit = 0;
+    bitmapBlit = nullptr;
+    alphamapBlit = nullptr;
+    alphaRGBBlit = nullptr;
 
-    fillRect = 0;
+    fillRect = nullptr;
 
     switch(type) {
     case None:
-        unclipped_blend = 0;
+        unclipped_blend = nullptr;
         break;
     case Solid: {
         const DrawHelper &drawHelper = qDrawHelper[rasterBuffer->format];
@@ -4695,17 +4695,17 @@ void QSpanData::adjustSpanMethods()
     case Texture:
         unclipped_blend = qBlendTexture;
         if (!texture.imageData)
-            unclipped_blend = 0;
+            unclipped_blend = nullptr;
 
         break;
     }
     // setup clipping
     if (!unclipped_blend) {
-        blend = 0;
+        blend = nullptr;
     } else if (!clip) {
         blend = unclipped_blend;
     } else if (clip->hasRectClip) {
-        blend = clip->clipRect.isEmpty() ? 0 : qt_span_fill_clipRect;
+        blend = clip->clipRect.isEmpty() ? nullptr : qt_span_fill_clipRect;
     } else {
         blend = qt_span_fill_clipped;
     }
@@ -4748,7 +4748,7 @@ void QSpanData::initTexture(const QImage *image, int alpha, QTextureData::Type _
 {
     const QImageData *d = const_cast<QImage *>(image)->data_ptr();
     if (!d || d->height == 0) {
-        texture.imageData = 0;
+        texture.imageData = nullptr;
         texture.width = 0;
         texture.height = 0;
         texture.x1 = 0;
@@ -4757,7 +4757,7 @@ void QSpanData::initTexture(const QImage *image, int alpha, QTextureData::Type _
         texture.y2 = 0;
         texture.bytesPerLine = 0;
         texture.format = QImage::Format_Invalid;
-        texture.colorTable = 0;
+        texture.colorTable = nullptr;
         texture.hasAlpha = alpha != 256;
     } else {
         texture.imageData = d->data;
@@ -4779,7 +4779,7 @@ void QSpanData::initTexture(const QImage *image, int alpha, QTextureData::Type _
         texture.bytesPerLine = d->bytes_per_line;
 
         texture.format = d->format;
-        texture.colorTable = (d->format <= QImage::Format_Indexed8 && !d->colortable.isEmpty()) ? &d->colortable : 0;
+        texture.colorTable = (d->format <= QImage::Format_Indexed8 && !d->colortable.isEmpty()) ? &d->colortable : nullptr;
         texture.hasAlpha = image->hasAlphaChannel() || alpha != 256;
     }
     texture.const_alpha = alpha;
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index 722afaf119..5d8f89eadd 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -115,7 +115,7 @@ QVectorPath::CacheEntry *QVectorPath::addCacheData(QPaintEngineEx *engine, void
                                                    qvectorpath_cache_cleanup cleanup) const{
     Q_ASSERT(!lookupCacheData(engine));
     if ((m_hints & IsCachedHint) == 0) {
-        m_cache = 0;
+        m_cache = nullptr;
         m_hints |= IsCachedHint;
     }
     CacheEntry *e = new CacheEntry;
@@ -162,8 +162,8 @@ struct StrokeHandler {
 
 QPaintEngineExPrivate::QPaintEngineExPrivate()
     : dasher(&stroker),
-      strokeHandler(0),
-      activeStroker(0),
+      strokeHandler(nullptr),
+      activeStroker(nullptr),
       strokerPen(Qt::NoPen)
 {
 }
@@ -211,7 +211,7 @@ void QPaintEngineExPrivate::replayClipOperations()
                             right, info.rectf.y(),
                             right, bottom,
                             info.rectf.x(), bottom };
-            QVectorPath vp(pts, 4, 0, QVectorPath::RectangleHint);
+            QVectorPath vp(pts, 4, nullptr, QVectorPath::RectangleHint);
             q->clip(vp, info.operation);
             break;
             }
@@ -418,7 +418,7 @@ void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
         if (style == Qt::SolidLine) {
             d->activeStroker = &d->stroker;
         } else if (style == Qt::NoPen) {
-            d->activeStroker = 0;
+            d->activeStroker = nullptr;
         } else {
             d->dasher.setDashPattern(pen.dashPattern());
             d->dasher.setDashOffset(pen.dashOffset());
@@ -616,7 +616,7 @@ void QPaintEngineEx::clip(const QRect &r, Qt::ClipOperation op)
                     right, bottom,
                     qreal(r.x()), bottom,
                     qreal(r.x()), qreal(r.y()) };
-    QVectorPath vp(pts, 5, 0, QVectorPath::RectangleHint);
+    QVectorPath vp(pts, 5, nullptr, QVectorPath::RectangleHint);
     clip(vp, op);
 }
 
@@ -687,7 +687,7 @@ void QPaintEngineEx::clip(const QRegion &region, Qt::ClipOperation op)
 void QPaintEngineEx::clip(const QPainterPath &path, Qt::ClipOperation op)
 {
     if (path.isEmpty()) {
-        QVectorPath vp(0, 0);
+        QVectorPath vp(nullptr, 0);
         clip(vp, op);
     } else {
         clip(qtVectorPathForPath(path), op);
@@ -698,7 +698,7 @@ void QPaintEngineEx::fillRect(const QRectF &r, const QBrush &brush)
 {
     qreal pts[] = { r.x(), r.y(), r.x() + r.width(), r.y(),
                     r.x() + r.width(), r.y() + r.height(), r.x(), r.y() + r.height() };
-    QVectorPath vp(pts, 4, 0, QVectorPath::RectangleHint);
+    QVectorPath vp(pts, 4, nullptr, QVectorPath::RectangleHint);
     fill(vp, brush);
 }
 
@@ -719,7 +719,7 @@ void QPaintEngineEx::drawRects(const QRect *rects, int rectCount)
                         right, bottom,
                         qreal(r.x()), bottom,
                         qreal(r.x()), qreal(r.y()) };
-        QVectorPath vp(pts, 5, 0, QVectorPath::RectangleHint);
+        QVectorPath vp(pts, 5, nullptr, QVectorPath::RectangleHint);
         draw(vp);
     }
 }
@@ -735,7 +735,7 @@ void QPaintEngineEx::drawRects(const QRectF *rects, int rectCount)
                         right, bottom,
                         r.x(), bottom,
                         r.x(), r.y() };
-        QVectorPath vp(pts, 5, 0, QVectorPath::RectangleHint);
+        QVectorPath vp(pts, 5, nullptr, QVectorPath::RectangleHint);
         draw(vp);
     }
 }
@@ -871,7 +871,7 @@ void QPaintEngineEx::drawPoints(const QPointF *points, int pointCount)
     } else {
         for (int i=0; i<pointCount; ++i) {
             qreal pts[] = { points[i].x(), points[i].y(), points[i].x() + qreal(1/63.), points[i].y() };
-            QVectorPath path(pts, 2, 0);
+            QVectorPath path(pts, 2, nullptr);
             stroke(path, pen);
         }
     }
@@ -903,7 +903,7 @@ void QPaintEngineEx::drawPoints(const QPoint *points, int pointCount)
         for (int i=0; i<pointCount; ++i) {
             qreal pts[] = { qreal(points[i].x()), qreal(points[i].y()),
                             qreal(points[i].x() +1/63.), qreal(points[i].y()) };
-            QVectorPath path(pts, 2, 0);
+            QVectorPath path(pts, 2, nullptr);
             stroke(path, pen);
         }
     }
@@ -912,7 +912,7 @@ void QPaintEngineEx::drawPoints(const QPoint *points, int pointCount)
 
 void QPaintEngineEx::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
 {
-    QVectorPath path((const qreal *) points, pointCount, 0, QVectorPath::polygonFlags(mode));
+    QVectorPath path((const qreal *) points, pointCount, nullptr, QVectorPath::polygonFlags(mode));
 
     if (mode == PolylineMode)
         stroke(path, state()->pen);
@@ -928,7 +928,7 @@ void QPaintEngineEx::drawPolygon(const QPoint *points, int pointCount, PolygonDr
     for (int i=0; i<count; ++i)
         pts[i] = ((const int *) points)[i];
 
-    QVectorPath path(pts.data(), pointCount, 0, QVectorPath::polygonFlags(mode));
+    QVectorPath path(pts.data(), pointCount, nullptr, QVectorPath::polygonFlags(mode));
 
     if (mode == PolylineMode)
         stroke(path, state()->pen);
@@ -960,7 +960,7 @@ void QPaintEngineEx::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, con
                     r.x() + r.width(), r.y() + r.height(),
                     r.x(), r.y() + r.height() };
 
-    QVectorPath path(pts, 4, 0, QVectorPath::RectangleHint);
+    QVectorPath path(pts, 4, nullptr, QVectorPath::RectangleHint);
     fill(path, brush);
 }
 
diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index d5cec1b45a..f70bbbd7d2 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -330,7 +330,7 @@ void QPainterPrivate::detachPainterPrivate(QPainter *q)
         original = new QPainterPrivate(q);
     }
 
-    d_ptrs[refcount - 1] = 0;
+    d_ptrs[refcount - 1] = nullptr;
     q->restore();
     q->d_ptr.take();
     q->d_ptr.reset(original);
@@ -338,7 +338,7 @@ void QPainterPrivate::detachPainterPrivate(QPainter *q)
     if (emulationEngine) {
         extended = emulationEngine->real_engine;
         delete emulationEngine;
-        emulationEngine = 0;
+        emulationEngine = nullptr;
     }
 }
 
@@ -1485,9 +1485,9 @@ QPainter::QPainter()
 */
 
 QPainter::QPainter(QPaintDevice *pd)
-    : d_ptr(0)
+    : d_ptr(nullptr)
 {
-    Q_ASSERT(pd != 0);
+    Q_ASSERT(pd != nullptr);
     if (!QPainterPrivate::attachPainterPrivate(this, pd)) {
         d_ptr.reset(new QPainterPrivate(this));
         begin(pd);
@@ -1718,9 +1718,9 @@ static inline void qt_cleanup_painter_state(QPainterPrivate *d)
 {
     qDeleteAll(d->states);
     d->states.clear();
-    d->state = 0;
-    d->engine = 0;
-    d->device = 0;
+    d->state = nullptr;
+    d->engine = nullptr;
+    d->device = nullptr;
 }
 
 bool QPainter::begin(QPaintDevice *pd)
@@ -1769,13 +1769,13 @@ bool QPainter::begin(QPaintDevice *pd)
 
     d->device = pd;
 
-    d->extended = d->engine->isExtended() ? static_cast<QPaintEngineEx *>(d->engine) : 0;
+    d->extended = d->engine->isExtended() ? static_cast<QPaintEngineEx *>(d->engine) : nullptr;
     if (d->emulationEngine)
         d->emulationEngine->real_engine = d->extended;
 
     // Setup new state...
     Q_ASSERT(!d->state);
-    d->state = d->extended ? d->extended->createState(0) : new QPainterState;
+    d->state = d->extended ? d->extended->createState(nullptr) : new QPainterState;
     d->state->painter = this;
     d->states.push_back(d->state);
 
@@ -1915,11 +1915,11 @@ bool QPainter::end()
 
     if (d->engine->isActive()) {
         ended = d->engine->end();
-        d->updateState(0);
+        d->updateState(nullptr);
 
         --d->device->painters;
         if (d->device->painters == 0) {
-            d->engine->setPaintDevice(0);
+            d->engine->setPaintDevice(nullptr);
             d->engine->setActive(false);
         }
     }
@@ -1935,11 +1935,11 @@ bool QPainter::end()
 
     if (d->emulationEngine) {
         delete d->emulationEngine;
-        d->emulationEngine = 0;
+        d->emulationEngine = nullptr;
     }
 
     if (d->extended) {
-        d->extended = 0;
+        d->extended = nullptr;
     }
 
     qt_cleanup_painter_state(d);
@@ -2761,7 +2761,7 @@ void QPainter::setClipRect(const QRectF &rect, Qt::ClipOperation op)
                         right, rect.y(),
                         right, bottom,
                         rect.x(), bottom };
-        QVectorPath vp(pts, 4, 0, QVectorPath::RectangleHint);
+        QVectorPath vp(pts, 4, nullptr, QVectorPath::RectangleHint);
         d->state->clipEnabled = true;
         d->extended->clip(vp, op);
         if (op == Qt::ReplaceClip || op == Qt::NoClip)
@@ -5642,7 +5642,7 @@ void QPainterPrivate::drawGlyphs(const quint32 *glyphArray, QFixedPoint *positio
 
     QFixed width = rightMost - leftMost;
 
-    if (extended != 0 && state->matrix.isAffine()) {
+    if (extended != nullptr && state->matrix.isAffine()) {
         QStaticTextItem staticTextItem;
         staticTextItem.color = state->pen.color();
         staticTextItem.font = state->font;
@@ -5685,7 +5685,7 @@ void QPainterPrivate::drawGlyphs(const quint32 *glyphArray, QFixedPoint *positio
 
     drawTextItemDecoration(q, QPointF(leftMost.toReal(), baseLine.toReal()),
                            fontEngine,
-                           0, // textEngine
+                           nullptr, // textEngine
                            (underline
                               ? QTextCharFormat::SingleUnderline
                               : QTextCharFormat::NoUnderline),
@@ -5781,7 +5781,7 @@ void QPainter::drawStaticText(const QPointF &topLeftPosition, const QStaticText
     // If we don't have an extended paint engine, if the painter is projected,
     // or if the font engine does not support the matrix, we go through standard
     // code path
-    if (d->extended == 0
+    if (d->extended == nullptr
             || !d->state->matrix.isAffine()
             || !fe->supportsTransformation(d->state->matrix)) {
         staticText_d->paintText(topLeftPosition, this, pen().color());
@@ -5981,7 +5981,7 @@ void QPainter::drawText(const QRect &r, int flags, const QString &str, QRect *br
         d->updateState(d->state);
 
     QRectF bounds;
-    qt_format_text(d->state->font, r, flags, 0, str, br ? &bounds : 0, 0, 0, 0, this);
+    qt_format_text(d->state->font, r, flags, nullptr, str, br ? &bounds : nullptr, 0, nullptr, 0, this);
     if (br)
         *br = bounds.toAlignedRect();
 }
@@ -6067,7 +6067,7 @@ void QPainter::drawText(const QRectF &r, int flags, const QString &str, QRectF *
     if (!d->extended)
         d->updateState(d->state);
 
-    qt_format_text(d->state->font, r, flags, 0, str, br, 0, 0, 0, this);
+    qt_format_text(d->state->font, r, flags, nullptr, str, br, 0, nullptr, 0, this);
 }
 
 /*!
@@ -6185,7 +6185,7 @@ void QPainter::drawText(const QRectF &r, const QString &text, const QTextOption
     if (!d->extended)
         d->updateState(d->state);
 
-    qt_format_text(d->state->font, r, 0, &o, text, 0, 0, 0, 0, this);
+    qt_format_text(d->state->font, r, 0, &o, text, nullptr, 0, nullptr, 0, this);
 }
 
 /*!
@@ -6415,7 +6415,7 @@ Q_GUI_EXPORT void qt_draw_decoration_for_glyphs(QPainter *painter, const glyph_t
 
     drawTextItemDecoration(painter, QPointF(leftMost.toReal(), baseLine.toReal()),
                            fontEngine,
-                           0, // textEngine
+                           nullptr, // textEngine
                            font.underline() ? QTextCharFormat::SingleUnderline
                                             : QTextCharFormat::NoUnderline, flags,
                            width.toReal(), charFormat);
@@ -6425,7 +6425,7 @@ void QPainter::drawTextItem(const QPointF &p, const QTextItem &ti)
 {
     Q_D(QPainter);
 
-    d->drawTextItem(p, ti, static_cast<QTextEngine *>(0));
+    d->drawTextItem(p, ti, static_cast<QTextEngine *>(nullptr));
 }
 
 void QPainterPrivate::drawTextItem(const QPointF &p, const QTextItem &_ti, QTextEngine *textEngine)
@@ -6682,7 +6682,7 @@ QRectF QPainter::boundingRect(const QRectF &r, const QString &text, const QTextO
         return QRectF(r.x(),r.y(), 0,0);
 
     QRectF br;
-    qt_format_text(d->state->font, r, Qt::TextDontPrint, &o, text, &br, 0, 0, 0, this);
+    qt_format_text(d->state->font, r, Qt::TextDontPrint, &o, text, &br, 0, nullptr, 0, this);
     return br;
 }
 
@@ -7429,7 +7429,7 @@ void QPainter::setRedirected(const QPaintDevice *device,
                              QPaintDevice *replacement,
                              const QPoint &offset)
 {
-    Q_ASSERT(device != 0);
+    Q_ASSERT(device != nullptr);
     Q_UNUSED(device)
     Q_UNUSED(replacement)
     Q_UNUSED(offset)
@@ -7480,7 +7480,7 @@ QPaintDevice *QPainter::redirected(const QPaintDevice *device, QPoint *offset)
 {
     Q_UNUSED(device)
     Q_UNUSED(offset)
-    return 0;
+    return nullptr;
 }
 #endif
 
@@ -7490,7 +7490,7 @@ void qt_format_text(const QFont &fnt, const QRectF &_r,
                     QPainter *painter)
 {
     qt_format_text(fnt, _r,
-                    tf, 0, str, brect,
+                    tf, nullptr, str, brect,
                     tabstops, ta, tabarraylen,
                     painter);
 }
@@ -7500,7 +7500,7 @@ void qt_format_text(const QFont &fnt, const QRectF &_r,
                     QPainter *painter)
 {
 
-    Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=0) ); // we either have an option or flags
+    Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=nullptr) ); // we either have an option or flags
 
     if (option) {
         tf |= option->alignment();
diff --git a/src/gui/painting/qpainterpath.cpp b/src/gui/painting/qpainterpath.cpp
index 859122c3b9..17d8b863ab 100644
--- a/src/gui/painting/qpainterpath.cpp
+++ b/src/gui/painting/qpainterpath.cpp
@@ -546,7 +546,7 @@ void QPainterPath::setElementPositionAt(int i, qreal x, qreal y)
     Constructs an empty QPainterPath object.
 */
 QPainterPath::QPainterPath() noexcept
-    : d_ptr(0)
+    : d_ptr(nullptr)
 {
 }
 
@@ -602,7 +602,7 @@ void QPainterPath::ensureData_helper()
     QPainterPath::Element e = { 0, 0, QPainterPath::MoveToElement };
     data->elements << e;
     d_ptr.reset(data);
-    Q_ASSERT(d_ptr != 0);
+    Q_ASSERT(d_ptr != nullptr);
 }
 
 /*!
@@ -1036,7 +1036,7 @@ void QPainterPath::arcMoveTo(const QRectF &rect, qreal angle)
         return;
 
     QPointF pt;
-    qt_find_ellipse_coords(rect, angle, 0, &pt, 0);
+    qt_find_ellipse_coords(rect, angle, 0, &pt, nullptr);
     moveTo(pt);
 }
 
diff --git a/src/gui/painting/qpathclipper.cpp b/src/gui/painting/qpathclipper.cpp
index 924d332452..1a1b2d76e2 100644
--- a/src/gui/painting/qpathclipper.cpp
+++ b/src/gui/painting/qpathclipper.cpp
@@ -690,12 +690,12 @@ int QKdPointTree::build(int begin, int end, int depth)
     if (last > begin)
         m_nodes.at(last).left = &m_nodes.at(build(begin, last, depth + 1));
     else
-        m_nodes.at(last).left = 0;
+        m_nodes.at(last).left = nullptr;
 
     if (last + 1 < end)
         m_nodes.at(last).right = &m_nodes.at(build(last + 1, end, depth + 1));
     else
-        m_nodes.at(last).right = 0;
+        m_nodes.at(last).right = nullptr;
 
     return last;
 }
@@ -811,7 +811,7 @@ void QWingedEdge::intersectAndAdd()
             if (isect->next) {
                 isect += isect->next;
             } else {
-                isect = 0;
+                isect = nullptr;
             }
         }
 
@@ -1535,8 +1535,8 @@ QPainterPath QPathClipper::clip(Operation operation)
         if (subjectPath == clipPath)
             return op == BoolSub ? QPainterPath() : subjectPath;
 
-        bool subjectIsRect = pathToRect(subjectPath, 0);
-        bool clipIsRect = pathToRect(clipPath, 0);
+        bool subjectIsRect = pathToRect(subjectPath, nullptr);
+        bool clipIsRect = pathToRect(clipPath, nullptr);
 
         const QRectF clipBounds = clipPath.boundingRect();
         const QRectF subjectBounds = subjectPath.boundingRect();
diff --git a/src/gui/painting/qpathsimplifier.cpp b/src/gui/painting/qpathsimplifier.cpp
index 4251840bbc..256a2fefe7 100644
--- a/src/gui/painting/qpathsimplifier.cpp
+++ b/src/gui/painting/qpathsimplifier.cpp
@@ -378,8 +378,8 @@ private:
 };
 
 inline PathSimplifier::BoundingVolumeHierarchy::BoundingVolumeHierarchy()
-    : root(0)
-    , nodeBlock(0)
+    : root(nullptr)
+    , nodeBlock(nullptr)
     , blockSize(0)
     , firstFree(0)
 {
@@ -392,7 +392,7 @@ inline PathSimplifier::BoundingVolumeHierarchy::~BoundingVolumeHierarchy()
 
 inline void PathSimplifier::BoundingVolumeHierarchy::allocate(int nodeCount)
 {
-    Q_ASSERT(nodeBlock == 0);
+    Q_ASSERT(nodeBlock == nullptr);
     Q_ASSERT(firstFree == 0);
     nodeBlock = new Node[blockSize = nodeCount];
 }
@@ -401,9 +401,9 @@ inline void PathSimplifier::BoundingVolumeHierarchy::free()
 {
     freeNode(root);
     delete[] nodeBlock;
-    nodeBlock = 0;
+    nodeBlock = nullptr;
     firstFree = blockSize = 0;
-    root = 0;
+    root = nullptr;
 }
 
 inline PathSimplifier::BVHNode *PathSimplifier::BoundingVolumeHierarchy::newNode()
@@ -427,7 +427,7 @@ inline void PathSimplifier::BoundingVolumeHierarchy::freeNode(Node *n)
 }
 
 inline PathSimplifier::ElementAllocator::ElementAllocator()
-    : blocks(0)
+    : blocks(nullptr)
 {
 }
 
@@ -442,11 +442,11 @@ inline PathSimplifier::ElementAllocator::~ElementAllocator()
 
 inline void PathSimplifier::ElementAllocator::allocate(int count)
 {
-    Q_ASSERT(blocks == 0);
+    Q_ASSERT(blocks == nullptr);
     Q_ASSERT(count > 0);
     blocks = (ElementBlock *)malloc(sizeof(ElementBlock) + (count - 1) * sizeof(Element));
     blocks->blockSize = count;
-    blocks->next = 0;
+    blocks->next = nullptr;
     blocks->firstFree = 0;
 }
 
@@ -479,7 +479,7 @@ inline void PathSimplifier::Element::flip()
         qSwap(indices[i], indices[degree - i]);
     }
     pointingUp = !pointingUp;
-    Q_ASSERT(next == 0 && previous == 0);
+    Q_ASSERT(next == nullptr && previous == nullptr);
 }
 
 PathSimplifier::PathSimplifier(const QVectorPath &path, QDataBuffer<QPoint> &vertices,
@@ -685,9 +685,9 @@ void PathSimplifier::connectElements()
     QDataBuffer<Event> events(m_elements.size() * 2);
     for (int i = 0; i < m_elements.size(); ++i) {
         Element *element = m_elements.at(i);
-        element->next = element->previous = 0;
+        element->next = element->previous = nullptr;
         element->winding = 0;
-        element->edgeNode = 0;
+        element->edgeNode = nullptr;
         const QPoint &u = m_points->at(element->indices[0]);
         const QPoint &v = m_points->at(element->indices[element->degree]);
         if (u != v) {
@@ -730,7 +730,7 @@ void PathSimplifier::connectElements()
                 Element *element2 = event2->element;
                 element->edgeNode->data = event2->element;
                 element2->edgeNode = element->edgeNode;
-                element->edgeNode = 0;
+                element->edgeNode = nullptr;
 
                 events.pop_back();
                 events.pop_back();
@@ -783,8 +783,8 @@ void PathSimplifier::connectElements()
                     Element *upperElement = m_elementAllocator.newElement();
                     *upperElement = *element;
                     upperElement->lowerIndex() = element->upperIndex() = pointIndex;
-                    upperElement->edgeNode = 0;
-                    element->next = element->previous = 0;
+                    upperElement->edgeNode = nullptr;
+                    element->next = element->previous = nullptr;
                     if (upperElement->next)
                         upperElement->next->previous = upperElement;
                     else if (upperElement->previous)
@@ -805,7 +805,7 @@ void PathSimplifier::connectElements()
                 RBNode *left = findElementLeftOf(event->element, bounds);
                 RBNode *node = m_elementList.newNode();
                 node->data = event->element;
-                Q_ASSERT(event->element->edgeNode == 0);
+                Q_ASSERT(event->element->edgeNode == nullptr);
                 event->element->edgeNode = node;
                 m_elementList.attachAfter(left, node);
             } else {
@@ -814,7 +814,7 @@ void PathSimplifier::connectElements()
                 Element *element = event->element;
                 Q_ASSERT(element->edgeNode);
                 m_elementList.deleteNode(element->edgeNode);
-                Q_ASSERT(element->edgeNode == 0);
+                Q_ASSERT(element->edgeNode == nullptr);
             }
             events.pop_back();
         }
@@ -870,8 +870,8 @@ void PathSimplifier::connectElements()
                 Q_ASSERT(i + 1 < orderedElements.size());
                 Element *next = orderedElements.at(i);
                 Element *previous = orderedElements.at(i + 1);
-                Q_ASSERT(next->previous == 0);
-                Q_ASSERT(previous->next == 0);
+                Q_ASSERT(next->previous == nullptr);
+                Q_ASSERT(previous->next == nullptr);
                 next->previous = previous;
                 previous->next = next;
             }
@@ -893,7 +893,7 @@ void PathSimplifier::fillIndices()
         m_elements.at(i)->processed = false;
     for (int i = 0; i < m_elements.size(); ++i) {
         Element *element = m_elements.at(i);
-        if (element->processed || element->next == 0)
+        if (element->processed || element->next == nullptr)
             continue;
         do {
             m_indices->add(element->indices[0]);
@@ -1395,13 +1395,13 @@ PathSimplifier::RBNode *PathSimplifier::findElementLeftOf(const Element *element
                                                           const QPair<RBNode *, RBNode *> &bounds)
 {
     if (!m_elementList.root)
-        return 0;
+        return nullptr;
     RBNode *current = bounds.first;
     Q_ASSERT(!current || !elementIsLeftOf(element, current->data));
     if (!current)
         current = m_elementList.front(m_elementList.root);
     Q_ASSERT(current);
-    RBNode *result = 0;
+    RBNode *result = nullptr;
     while (current != bounds.second && !elementIsLeftOf(element, current->data)) {
         result = current;
         current = m_elementList.next(current);
diff --git a/src/gui/painting/qpdf.cpp b/src/gui/painting/qpdf.cpp
index f560e1f0f0..932c3e6f5a 100644
--- a/src/gui/painting/qpdf.cpp
+++ b/src/gui/painting/qpdf.cpp
@@ -439,8 +439,8 @@ QByteArray QPdf::generateDashes(const QPen &pen)
 
 
 static const char* const pattern_for_brush[] = {
-    0, // NoBrush
-    0, // SolidPattern
+    nullptr, // NoBrush
+    nullptr, // SolidPattern
     "0 J\n"
     "6 w\n"
     "[] 0 d\n"
@@ -637,7 +637,7 @@ static void cubicToHook(qfixed c1x, qfixed c1y,
 }
 
 QPdf::Stroker::Stroker()
-    : stream(0),
+    : stream(nullptr),
     first(true),
     dashStroker(&basicStroker)
 {
@@ -652,7 +652,7 @@ QPdf::Stroker::Stroker()
 void QPdf::Stroker::setPen(const QPen &pen, QPainter::RenderHints hints)
 {
     if (pen.style() == Qt::NoPen) {
-        stroker = 0;
+        stroker = nullptr;
         return;
     }
     qreal w = pen.widthF();
@@ -1469,7 +1469,7 @@ int QPdfEngine::metric(QPaintDevice::PaintDeviceMetric metricType) const
 QPdfEnginePrivate::QPdfEnginePrivate()
     : clipEnabled(false), allClipped(false), hasPen(true), hasBrush(false), simplePen(false),
       pdfVersion(QPdfEngine::Version_1_4),
-      outDevice(0), ownsDevice(false),
+      outDevice(nullptr), ownsDevice(false),
       embedFonts(true),
       grayscale(false),
       m_pageLayout(QPageSize(QPageSize::A4), QPageLayout::Portrait, QMarginsF(10, 10, 10, 10))
@@ -1477,8 +1477,8 @@ QPdfEnginePrivate::QPdfEnginePrivate()
     initResources();
     resolution = 1200;
     currentObject = 1;
-    currentPage = 0;
-    stroker.stream = 0;
+    currentPage = nullptr;
+    stroker.stream = nullptr;
 
     streampos = 0;
 
@@ -1547,12 +1547,12 @@ bool QPdfEngine::end()
     qDeleteAll(d->fonts);
     d->fonts.clear();
     delete d->currentPage;
-    d->currentPage = 0;
+    d->currentPage = nullptr;
 
     if (d->outDevice && d->ownsDevice) {
         d->outDevice->close();
         delete d->outDevice;
-        d->outDevice = 0;
+        d->outDevice = nullptr;
     }
 
     setActive(false);
diff --git a/src/gui/painting/qpdfwriter.cpp b/src/gui/painting/qpdfwriter.cpp
index bf7e2d3dca..35814d146c 100644
--- a/src/gui/painting/qpdfwriter.cpp
+++ b/src/gui/painting/qpdfwriter.cpp
@@ -55,7 +55,7 @@ public:
         : QObjectPrivate()
     {
         engine = new QPdfEngine();
-        output = 0;
+        output = nullptr;
         pdfVersion = QPdfWriter::PdfVersion_1_4;
     }
     ~QPdfWriterPrivate()
diff --git a/src/gui/painting/qpen.cpp b/src/gui/painting/qpen.cpp
index dc6e3e04d0..1a940443d1 100644
--- a/src/gui/painting/qpen.cpp
+++ b/src/gui/painting/qpen.cpp
@@ -254,7 +254,7 @@ public:
     {
         if (!pen->ref.deref())
             delete pen;
-        pen = 0;
+        pen = nullptr;
     }
 };
 
diff --git a/src/gui/painting/qplatformbackingstore.cpp b/src/gui/painting/qplatformbackingstore.cpp
index 0ecb4390e9..c092a7153f 100644
--- a/src/gui/painting/qplatformbackingstore.cpp
+++ b/src/gui/painting/qplatformbackingstore.cpp
@@ -87,10 +87,10 @@ class QPlatformBackingStorePrivate
 public:
     QPlatformBackingStorePrivate(QWindow *w)
         : window(w)
-        , backingStore(0)
+        , backingStore(nullptr)
 #ifndef QT_NO_OPENGL
         , textureId(0)
-        , blitter(0)
+        , blitter(nullptr)
 #endif
     {
     }
diff --git a/src/gui/painting/qrasterizer.cpp b/src/gui/painting/qrasterizer.cpp
index b4014272f4..cd31d75f83 100644
--- a/src/gui/painting/qrasterizer.cpp
+++ b/src/gui/painting/qrasterizer.cpp
@@ -209,7 +209,7 @@ QScanConverter::QScanConverter()
    : m_lines(0)
    , m_alloc(0)
    , m_size(0)
-   , m_intersections(0)
+   , m_intersections(nullptr)
    , m_active(0)
 {
 }
@@ -442,7 +442,7 @@ void QScanConverter::end()
         free(m_intersections);
         m_alloc = 0;
         m_size = 0;
-        m_intersections = 0;
+        m_intersections = nullptr;
     }
 
     if (m_lines.size() > 1024)
diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index 82f5be2b65..783b02fb93 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -1128,7 +1128,7 @@ Q_GUI_EXPORT QPainterPath qt_regionToPath(const QRegion &region)
     segments.resize(4 * (end - rect));
 
     int lastRowSegmentCount = 0;
-    Segment *lastRowSegments = 0;
+    Segment *lastRowSegments = nullptr;
 
     int lastSegment = 0;
     int lastY = 0;
@@ -1380,10 +1380,10 @@ void QRegionPrivate::intersect(const QRect &rect)
             extents.setRight(qMax(extents.right(), dest->right()));
             extents.setBottom(qMax(extents.bottom(), dest->bottom()));
 
-            const QRect *nextToLast = (numRects > 1 ? dest - 2 : 0);
+            const QRect *nextToLast = (numRects > 1 ? dest - 2 : nullptr);
 
             // mergeFromBelow inlined and optimized
-            if (canMergeFromBelow(dest - 1, dest, nextToLast, 0)) {
+            if (canMergeFromBelow(dest - 1, dest, nextToLast, nullptr)) {
                 if (!n || src->y() != dest->y() || src->left() > r.right()) {
                     QRect *prev = dest - 1;
                     prev->setBottom(dest->bottom());
@@ -1408,11 +1408,11 @@ void QRegionPrivate::append(const QRect *r)
     QRect *myLast = (numRects == 1 ? &extents : rects.data() + (numRects - 1));
     if (mergeFromRight(myLast, r)) {
         if (numRects > 1) {
-            const QRect *nextToTop = (numRects > 2 ? myLast - 2 : 0);
-            if (mergeFromBelow(myLast - 1, myLast, nextToTop, 0))
+            const QRect *nextToTop = (numRects > 2 ? myLast - 2 : nullptr);
+            if (mergeFromBelow(myLast - 1, myLast, nextToTop, nullptr))
                 --numRects;
         }
-    } else if (mergeFromBelow(myLast, r, (numRects > 1 ? myLast - 1 : 0), 0)) {
+    } else if (mergeFromBelow(myLast, r, (numRects > 1 ? myLast - 1 : nullptr), nullptr)) {
         // nothing
     } else {
         vectorize();
@@ -1451,18 +1451,18 @@ void QRegionPrivate::append(const QRegionPrivate *r)
     {
         const QRect *rFirst = srcRect;
         QRect *myLast = destRect - 1;
-        const QRect *nextToLast = (numRects > 1 ? myLast - 1 : 0);
+        const QRect *nextToLast = (numRects > 1 ? myLast - 1 : nullptr);
         if (mergeFromRight(myLast, rFirst)) {
             ++srcRect;
             --numAppend;
-            const QRect *rNextToFirst = (numAppend > 1 ? rFirst + 2 : 0);
+            const QRect *rNextToFirst = (numAppend > 1 ? rFirst + 2 : nullptr);
             if (mergeFromBelow(myLast, rFirst + 1, nextToLast, rNextToFirst)) {
                 ++srcRect;
                 --numAppend;
             }
             if (numRects  > 1) {
-                nextToLast = (numRects > 2 ? myLast - 2 : 0);
-                rNextToFirst = (numAppend > 0 ? srcRect : 0);
+                nextToLast = (numRects > 2 ? myLast - 2 : nullptr);
+                rNextToFirst = (numAppend > 0 ? srcRect : nullptr);
                 if (mergeFromBelow(myLast - 1, myLast, nextToLast, rNextToFirst)) {
                     --destRect;
                     --numRects;
@@ -1522,20 +1522,20 @@ void QRegionPrivate::prepend(const QRegionPrivate *r)
     // try merging
     {
         QRect *myFirst = rects.data();
-        const QRect *nextToFirst = (numRects > 1 ? myFirst + 1 : 0);
+        const QRect *nextToFirst = (numRects > 1 ? myFirst + 1 : nullptr);
         const QRect *rLast = r->rects.constData() + r->numRects - 1;
-        const QRect *rNextToLast = (r->numRects > 1 ? rLast - 1 : 0);
+        const QRect *rNextToLast = (r->numRects > 1 ? rLast - 1 : nullptr);
         if (mergeFromLeft(myFirst, rLast)) {
             --numPrepend;
             --rLast;
-            rNextToLast = (numPrepend > 1 ? rLast - 1 : 0);
+            rNextToLast = (numPrepend > 1 ? rLast - 1 : nullptr);
             if (mergeFromAbove(myFirst, rLast, nextToFirst, rNextToLast)) {
                 --numPrepend;
                 --rLast;
             }
             if (numRects  > 1) {
-                nextToFirst = (numRects > 2? myFirst + 2 : 0);
-                rNextToLast = (numPrepend > 0 ? rLast : 0);
+                nextToFirst = (numRects > 2? myFirst + 2 : nullptr);
+                rNextToLast = (numPrepend > 0 ? rLast : nullptr);
                 if (mergeFromAbove(myFirst + 1, myFirst, nextToFirst, rNextToLast)) {
                     --numRects;
                     ++numSkip;
@@ -1585,14 +1585,14 @@ void QRegionPrivate::prepend(const QRect *r)
     QRect *myFirst = (numRects == 1 ? &extents : rects.data());
     if (mergeFromLeft(myFirst, r)) {
         if (numRects > 1) {
-            const QRect *nextToFirst = (numRects > 2 ? myFirst + 2 : 0);
-            if (mergeFromAbove(myFirst + 1, myFirst, nextToFirst, 0)) {
+            const QRect *nextToFirst = (numRects > 2 ? myFirst + 2 : nullptr);
+            if (mergeFromAbove(myFirst + 1, myFirst, nextToFirst, nullptr)) {
                 --numRects;
                 memmove(rects.data(), rects.constData() + 1,
                         numRects * sizeof(QRect));
             }
         }
-    } else if (mergeFromAbove(myFirst, r, (numRects > 1 ? myFirst + 1 : 0), 0)) {
+    } else if (mergeFromAbove(myFirst, r, (numRects > 1 ? myFirst + 1 : nullptr), nullptr)) {
         // nothing
     } else {
         vectorize();
@@ -2324,14 +2324,14 @@ static void miRegionOp(QRegionPrivate &dest,
             top = qMax(r1->top(), ybot + 1);
             bot = qMin(r1->bottom(), r2->top() - 1);
 
-            if (nonOverlap1Func != 0 && bot >= top)
+            if (nonOverlap1Func != nullptr && bot >= top)
                 (*nonOverlap1Func)(dest, r1, r1BandEnd, top, bot);
             ytop = r2->top();
         } else if (r2->top() < r1->top()) {
             top = qMax(r2->top(), ybot + 1);
             bot = qMin(r2->bottom(), r1->top() - 1);
 
-            if (nonOverlap2Func != 0 && bot >= top)
+            if (nonOverlap2Func != nullptr && bot >= top)
                 (*nonOverlap2Func)(dest, r2, r2BandEnd, top, bot);
             ytop = r1->top();
         } else {
@@ -2374,7 +2374,7 @@ static void miRegionOp(QRegionPrivate &dest,
      */
     curBand = dest.numRects;
     if (r1 != r1End) {
-        if (nonOverlap1Func != 0) {
+        if (nonOverlap1Func != nullptr) {
             do {
                 r1BandEnd = r1;
                 while (r1BandEnd < r1End && r1BandEnd->top() == r1->top())
@@ -2383,7 +2383,7 @@ static void miRegionOp(QRegionPrivate &dest,
                 r1 = r1BandEnd;
             } while (r1 != r1End);
         }
-    } else if ((r2 != r2End) && (nonOverlap2Func != 0)) {
+    } else if ((r2 != r2End) && (nonOverlap2Func != nullptr)) {
         do {
             r2BandEnd = r2;
             while (r2BandEnd < r2End && r2BandEnd->top() == r2->top())
@@ -2698,7 +2698,7 @@ static void SubtractRegion(QRegionPrivate *regM, QRegionPrivate *regS,
     Q_ASSERT(!regS->contains(*regM));
     Q_ASSERT(!EqualRegion(regM, regS));
 
-    miRegionOp(dest, regM, regS, miSubtractO, miSubtractNonO1, 0);
+    miRegionOp(dest, regM, regS, miSubtractO, miSubtractNonO1, nullptr);
 
     /*
      * Can't alter dest's extents before we call miRegionOp because
@@ -3235,14 +3235,14 @@ static void InsertEdgeInET(EdgeTable *ET, EdgeTableEntry *ETE, int scanline,
                   (ScanLineListBlock *)malloc(sizeof(ScanLineListBlock));
             Q_CHECK_PTR(tmpSLLBlock);
             (*SLLBlock)->next = tmpSLLBlock;
-            tmpSLLBlock->next = (ScanLineListBlock *)NULL;
+            tmpSLLBlock->next = (ScanLineListBlock *)nullptr;
             *SLLBlock = tmpSLLBlock;
             *iSLLBlock = 0;
         }
         pSLL = &((*SLLBlock)->SLLs[(*iSLLBlock)++]);
 
         pSLL->next = pPrevSLL->next;
-        pSLL->edgelist = (EdgeTableEntry *)NULL;
+        pSLL->edgelist = (EdgeTableEntry *)nullptr;
         pPrevSLL->next = pSLL;
     }
     pSLL->scanline = scanline;
@@ -3250,7 +3250,7 @@ static void InsertEdgeInET(EdgeTable *ET, EdgeTableEntry *ETE, int scanline,
     /*
      * now insert the edge in the right bucket
      */
-    prev = 0;
+    prev = nullptr;
     start = pSLL->edgelist;
     while (start && (start->bres.minor_axis < ETE->bres.minor_axis)) {
         prev = start;
@@ -3306,18 +3306,18 @@ static void CreateETandAET(int count, const QPoint *pts,
     /*
      *  initialize the Active Edge Table
      */
-    AET->next = 0;
-    AET->back = 0;
-    AET->nextWETE = 0;
+    AET->next = nullptr;
+    AET->back = nullptr;
+    AET->nextWETE = nullptr;
     AET->bres.minor_axis = SMALL_COORDINATE;
 
     /*
      *  initialize the Edge Table.
      */
-    ET->scanlines.next = 0;
+    ET->scanlines.next = nullptr;
     ET->ymax = SMALL_COORDINATE;
     ET->ymin = LARGE_COORDINATE;
-    pSLLBlock->next = 0;
+    pSLLBlock->next = nullptr;
 
     PrevPt = &pts[count - 1];
 
@@ -3426,7 +3426,7 @@ static void computeWAET(EdgeTableEntry *AET)
     int inside = 1;
     int isInside = 0;
 
-    AET->nextWETE = 0;
+    AET->nextWETE = nullptr;
     pWETE = AET;
     AET = AET->next;
     while (AET) {
@@ -3442,7 +3442,7 @@ static void computeWAET(EdgeTableEntry *AET)
         }
         AET = AET->next;
     }
-    pWETE->nextWETE = 0;
+    pWETE->nextWETE = nullptr;
 }
 
 /*
@@ -3672,7 +3672,7 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
 
     if (!(pETEs = static_cast<EdgeTableEntry *>(malloc(sizeof(EdgeTableEntry) * Count)))) {
         delete region;
-        return 0;
+        return nullptr;
     }
 
     region->vectorize();
@@ -3692,7 +3692,7 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
 #endif
         delete AET;
         delete region;
-        return 0;
+        return nullptr;
     }
 
 
@@ -3808,7 +3808,7 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
             curPtBlock = tmpPtBlock;
         }
         free(pETEs);
-        return 0; // this function returns 0 in case of an error
+        return nullptr; // this function returns 0 in case of an error
     }
 
     FreeStorage(SLLBlock.next);
@@ -4185,7 +4185,7 @@ QRegion QRegion::intersected(const QRegion &r) const
 
     QRegion result;
     result.detach();
-    miRegionOp(*result.d->qt_rgn, d->qt_rgn, r.d->qt_rgn, miIntersectO, 0, 0);
+    miRegionOp(*result.d->qt_rgn, d->qt_rgn, r.d->qt_rgn, miIntersectO, nullptr, nullptr);
 
     /*
      * Can't alter dest's extents before we call miRegionOp because
diff --git a/src/gui/painting/qstroker.cpp b/src/gui/painting/qstroker.cpp
index 271d3ba6bf..22302f9790 100644
--- a/src/gui/painting/qstroker.cpp
+++ b/src/gui/painting/qstroker.cpp
@@ -185,10 +185,10 @@ QStrokerOps::QStrokerOps()
     : m_elements(0)
     , m_curveThreshold(qt_real_to_fixed(0.25))
     , m_dashThreshold(qt_real_to_fixed(0.25))
-    , m_customData(0)
-    , m_moveTo(0)
-    , m_lineTo(0)
-    , m_cubicTo(0)
+    , m_customData(nullptr)
+    , m_moveTo(nullptr)
+    , m_lineTo(nullptr)
+    , m_cubicTo(nullptr)
 {
 }
 
@@ -219,7 +219,7 @@ void QStrokerOps::end()
 {
     if (m_elements.size() > 1)
         processCurrentSubpath();
-    m_customData = 0;
+    m_customData = nullptr;
 }
 
 /*!
diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp
index 7a3dd04965..f40ca9d8b4 100644
--- a/src/gui/painting/qtextureglyphcache.cpp
+++ b/src/gui/painting/qtextureglyphcache.cpp
@@ -127,7 +127,7 @@ bool QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const
 
         QFixed subPixelPosition;
         if (supportsSubPixelPositions) {
-            QFixed x = positions != 0 ? positions[i].x : QFixed();
+            QFixed x = positions != nullptr ? positions[i].x : QFixed();
             subPixelPosition = fontEngine->subPixelPositionForX(x);
         }
 
diff --git a/src/gui/painting/qtriangulatingstroker.cpp b/src/gui/painting/qtriangulatingstroker.cpp
index b1b07f9699..8e0308f268 100644
--- a/src/gui/painting/qtriangulatingstroker.cpp
+++ b/src/gui/painting/qtriangulatingstroker.cpp
@@ -150,7 +150,7 @@ void QTriangulatingStroker::process(const QVectorPath &path, const QPen &pen, co
     m_cos_theta = qFastCos(Q_PI / m_roundness);
 
     const qreal *endPts = pts + (count<<1);
-    const qreal *startPts = 0;
+    const qreal *startPts = nullptr;
 
     Qt::PenCapStyle cap = m_cap_style;
 
@@ -510,7 +510,7 @@ static void qdashprocessor_cubicTo(qreal, qreal, qreal, qreal, qreal, qreal, voi
 
 QDashedStrokeProcessor::QDashedStrokeProcessor()
     : m_points(0), m_types(0),
-      m_dash_stroker(0), m_inv_scale(1)
+      m_dash_stroker(nullptr), m_inv_scale(1)
 {
     m_dash_stroker.setMoveToHook(qdashprocessor_moveTo);
     m_dash_stroker.setLineToHook(qdashprocessor_lineTo);
diff --git a/src/gui/painting/qtriangulator.cpp b/src/gui/painting/qtriangulator.cpp
index 9be3eeaffd..ec3ab8ff8f 100644
--- a/src/gui/painting/qtriangulator.cpp
+++ b/src/gui/painting/qtriangulator.cpp
@@ -958,7 +958,7 @@ void QTriangulator<T>::ComplexToSimple::initEdges()
         } else {
             Q_ASSERT(i + 1 < m_parent->m_indices.size());
             // {node, from, to, next, previous, winding, mayIntersect, pointingUp, originallyPointingUp}
-            Edge edge = {0, int(m_parent->m_indices.at(i)), int(m_parent->m_indices.at(i + 1)), -1, -1, 0, true, false, false};
+            Edge edge = {nullptr, int(m_parent->m_indices.at(i)), int(m_parent->m_indices.at(i + 1)), -1, -1, 0, true, false, false};
             m_edges.add(edge);
         }
     }
@@ -1029,7 +1029,7 @@ template <typename T>
 QRBTree<int>::Node *QTriangulator<T>::ComplexToSimple::searchEdgeLeftOf(int edgeIndex) const
 {
     QRBTree<int>::Node *current = m_edgeList.root;
-    QRBTree<int>::Node *result = 0;
+    QRBTree<int>::Node *result = nullptr;
     while (current) {
         if (edgeIsLeftOfEdge(edgeIndex, current->data)) {
             current = current->left;
@@ -1072,7 +1072,7 @@ QPair<QRBTree<int>::Node *, QRBTree<int>::Node *> QTriangulator<T>::ComplexToSim
         }
         current = (d < 0 ? current->left : current->right);
     }
-    if (current == 0)
+    if (current == nullptr)
         return result;
 
     current = result.first->left;
@@ -1273,7 +1273,7 @@ void QTriangulator<T>::ComplexToSimple::fillPriorityQueue()
     m_events.reserve(m_edges.size() * 2);
     for (int i = 0; i < m_edges.size(); ++i) {
         Q_ASSERT(m_edges.at(i).previous == -1 && m_edges.at(i).next == -1);
-        Q_ASSERT(m_edges.at(i).node == 0);
+        Q_ASSERT(m_edges.at(i).node == nullptr);
         Q_ASSERT(m_edges.at(i).pointingUp == m_edges.at(i).originallyPointingUp);
         Q_ASSERT(m_edges.at(i).pointingUp == (m_parent->m_vertices.at(m_edges.at(i).to) < m_parent->m_vertices.at(m_edges.at(i).from)));
         // Ignore zero-length edges.
@@ -1296,7 +1296,7 @@ void QTriangulator<T>::ComplexToSimple::calculateIntersections()
     fillPriorityQueue();
 
     Q_ASSERT(m_topIntersection.empty());
-    Q_ASSERT(m_edgeList.root == 0);
+    Q_ASSERT(m_edgeList.root == nullptr);
 
     // Find all intersection points.
     while (!m_events.isEmpty()) {
@@ -1305,7 +1305,7 @@ void QTriangulator<T>::ComplexToSimple::calculateIntersections()
 
         // Find all edges in the edge list that contain the current vertex and mark them to be split later.
         QPair<QRBTree<int>::Node *, QRBTree<int>::Node *> range = bounds(event.point);
-        QRBTree<int>::Node *leftNode = range.first ? m_edgeList.previous(range.first) : 0;
+        QRBTree<int>::Node *leftNode = range.first ? m_edgeList.previous(range.first) : nullptr;
         int vertex = (event.type == Event::Upper ? m_edges.at(event.edge).upper() : m_edges.at(event.edge).lower());
         QIntersectionPoint eventPoint = QT_PREPEND_NAMESPACE(qIntersectionPoint)(event.point);
 
@@ -1361,7 +1361,7 @@ int QTriangulator<T>::ComplexToSimple::splitEdge(int splitIndex)
 {
     const Split &split = m_splits.at(splitIndex);
     Edge &lowerEdge = m_edges.at(split.edge);
-    Q_ASSERT(lowerEdge.node == 0);
+    Q_ASSERT(lowerEdge.node == nullptr);
     Q_ASSERT(lowerEdge.previous == -1 && lowerEdge.next == -1);
 
     if (lowerEdge.from == split.vertex)
@@ -1439,7 +1439,7 @@ void QTriangulator<T>::ComplexToSimple::insertEdgeIntoVectorIfWanted(ShortArray
 template <typename T>
 void QTriangulator<T>::ComplexToSimple::removeUnwantedEdgesAndConnect()
 {
-    Q_ASSERT(m_edgeList.root == 0);
+    Q_ASSERT(m_edgeList.root == nullptr);
     // Initialize priority queue.
     fillPriorityQueue();
 
@@ -1772,7 +1772,7 @@ void QTriangulator<T>::SimpleToMonotone::setupDataStructures()
 {
     int i = 0;
     Edge e;
-    e.node = 0;
+    e.node = nullptr;
     e.twin = -1;
 
     while (i + 3 <= m_parent->m_indices.size()) {
@@ -1862,7 +1862,7 @@ template <typename T>
 QRBTree<int>::Node *QTriangulator<T>::SimpleToMonotone::searchEdgeLeftOfEdge(int edgeIndex) const
 {
     QRBTree<int>::Node *current = m_edgeList.root;
-    QRBTree<int>::Node *result = 0;
+    QRBTree<int>::Node *result = nullptr;
     while (current) {
         if (edgeIsLeftOfEdge(edgeIndex, current->data)) {
             current = current->left;
@@ -1879,7 +1879,7 @@ template <typename T>
 QRBTree<int>::Node *QTriangulator<T>::SimpleToMonotone::searchEdgeLeftOfPoint(int pointIndex) const
 {
     QRBTree<int>::Node *current = m_edgeList.root;
-    QRBTree<int>::Node *result = 0;
+    QRBTree<int>::Node *result = nullptr;
     while (current) {
         const QPodPoint &p1 = m_parent->m_vertices.at(m_edges.at(current->data).lower());
         const QPodPoint &p2 = m_parent->m_vertices.at(m_edges.at(current->data).upper());
@@ -2038,7 +2038,7 @@ void QTriangulator<T>::SimpleToMonotone::monotoneDecomposition()
         j = m_edges.at(i).previous;
         Q_ASSERT(j < m_edges.size());
 
-        QRBTree<int>::Node *leftEdgeNode = 0;
+        QRBTree<int>::Node *leftEdgeNode = nullptr;
 
         switch (m_edges.at(i).type) {
         case RegularVertex:
@@ -2049,7 +2049,7 @@ void QTriangulator<T>::SimpleToMonotone::monotoneDecomposition()
                     if (m_edges.at(m_edges.at(i).helper).type == MergeVertex)
                         diagonals.add(QPair<int, int>(i, m_edges.at(i).helper));
                     m_edges.at(j).node = m_edges.at(i).node;
-                    m_edges.at(i).node = 0;
+                    m_edges.at(i).node = nullptr;
                     m_edges.at(j).node->data = j;
                     m_edges.at(j).helper = i;
                 } else if (m_edges.at(j).node) {
@@ -2057,7 +2057,7 @@ void QTriangulator<T>::SimpleToMonotone::monotoneDecomposition()
                     if (m_edges.at(m_edges.at(j).helper).type == MergeVertex)
                         diagonals.add(QPair<int, int>(i, m_edges.at(j).helper));
                     m_edges.at(i).node = m_edges.at(j).node;
-                    m_edges.at(j).node = 0;
+                    m_edges.at(j).node = nullptr;
                     m_edges.at(i).node->data = i;
                     m_edges.at(i).helper = i;
                 } else {
diff --git a/src/gui/text/qabstracttextdocumentlayout.cpp b/src/gui/text/qabstracttextdocumentlayout.cpp
index 8b8f3e28ac..8528f59844 100644
--- a/src/gui/text/qabstracttextdocumentlayout.cpp
+++ b/src/gui/text/qabstracttextdocumentlayout.cpp
@@ -471,7 +471,7 @@ QTextObjectInterface *QAbstractTextDocumentLayout::handlerForObject(int objectTy
 
     QTextObjectHandler handler = d->handlers.value(objectType);
     if (!handler.component)
-        return 0;
+        return nullptr;
 
     return handler.iface;
 }
diff --git a/src/gui/text/qdistancefield.cpp b/src/gui/text/qdistancefield.cpp
index 89f943ca51..c843e3b706 100644
--- a/src/gui/text/qdistancefield.cpp
+++ b/src/gui/text/qdistancefield.cpp
@@ -850,7 +850,7 @@ QDistanceFieldData::QDistanceFieldData(const QDistanceFieldData &other)
     if (nbytes && other.data)
         data = (uchar *)memcpy(malloc(nbytes), other.data, nbytes);
     else
-        data = 0;
+        data = nullptr;
 }
 
 QDistanceFieldData::~QDistanceFieldData()
@@ -1046,7 +1046,7 @@ const uchar *QDistanceField::constBits() const
 uchar *QDistanceField::scanLine(int i)
 {
     if (isNull())
-        return 0;
+        return nullptr;
 
     Q_ASSERT(i >= 0 && i < d->height);
     return d->data + i * d->width;
@@ -1055,7 +1055,7 @@ uchar *QDistanceField::scanLine(int i)
 const uchar *QDistanceField::scanLine(int i) const
 {
     if (isNull())
-        return 0;
+        return nullptr;
 
     Q_ASSERT(i >= 0 && i < d->height);
     return d->data + i * d->width;
@@ -1064,7 +1064,7 @@ const uchar *QDistanceField::scanLine(int i) const
 const uchar *QDistanceField::constScanLine(int i) const
 {
     if (isNull())
-        return 0;
+        return nullptr;
 
     Q_ASSERT(i >= 0 && i < d->height);
     return d->data + i * d->width;
diff --git a/src/gui/text/qfont.cpp b/src/gui/text/qfont.cpp
index bf130fa0b7..e162015aba 100644
--- a/src/gui/text/qfont.cpp
+++ b/src/gui/text/qfont.cpp
@@ -180,14 +180,14 @@ Q_GUI_EXPORT int qt_defaultDpi()
 }
 
 QFontPrivate::QFontPrivate()
-    : engineData(0), dpi(qt_defaultDpi()),
+    : engineData(nullptr), dpi(qt_defaultDpi()),
       underline(false), overline(false), strikeOut(false), kerning(true),
-      capital(0), letterSpacingIsAbsolute(false), scFont(0)
+      capital(0), letterSpacingIsAbsolute(false), scFont(nullptr)
 {
 }
 
 QFontPrivate::QFontPrivate(const QFontPrivate &other)
-    : request(other.request), engineData(0), dpi(other.dpi),
+    : request(other.request), engineData(nullptr), dpi(other.dpi),
       underline(other.underline), overline(other.overline),
       strikeOut(other.strikeOut), kerning(other.kerning),
       capital(other.capital), letterSpacingIsAbsolute(other.letterSpacingIsAbsolute),
@@ -202,10 +202,10 @@ QFontPrivate::~QFontPrivate()
 {
     if (engineData && !engineData->ref.deref())
         delete engineData;
-    engineData = 0;
+    engineData = nullptr;
     if (scFont && scFont != this)
         scFont->ref.deref();
-    scFont = 0;
+    scFont = nullptr;
 }
 
 extern QRecursiveMutex *qt_fontdatabase_mutex();
@@ -221,7 +221,7 @@ QFontEngine *QFontPrivate::engineForScript(int script) const
         // throw out engineData that came from a different thread
         if (!engineData->ref.deref())
             delete engineData;
-        engineData = 0;
+        engineData = nullptr;
     }
     if (!engineData || !QT_FONT_ENGINE_FROM_DATA(engineData, script))
         QFontDatabase::load(this, script);
@@ -261,7 +261,7 @@ QFontPrivate *QFontPrivate::smallCapsFontPrivate() const
 
 void QFontPrivate::resolve(uint mask, const QFontPrivate *other)
 {
-    Q_ASSERT(other != 0);
+    Q_ASSERT(other != nullptr);
 
     dpi = other->dpi;
 
@@ -346,7 +346,7 @@ QFontEngineData::~QFontEngineData()
         if (engines[i]) {
             if (!engines[i]->ref.deref())
                 delete engines[i];
-            engines[i] = 0;
+            engines[i] = nullptr;
         }
     }
 }
@@ -610,10 +610,10 @@ void QFont::detach()
     if (d->ref.loadRelaxed() == 1) {
         if (d->engineData && !d->engineData->ref.deref())
             delete d->engineData;
-        d->engineData = 0;
+        d->engineData = nullptr;
         if (d->scFont && d->scFont != d.data())
             d->scFont->ref.deref();
-        d->scFont = 0;
+        d->scFont = nullptr;
         return;
     }
 
@@ -1666,7 +1666,7 @@ void QFont::setRawMode(bool)
 bool QFont::exactMatch() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return d->request.exactMatch(engine->fontDef);
 }
 
@@ -1834,7 +1834,7 @@ Q_GLOBAL_STATIC(QFontSubst, globalFontSubst)
 QString QFont::substitute(const QString &familyName)
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     QFontSubst::ConstIterator it = fontSubst->constFind(familyName.toLower());
     if (it != fontSubst->constEnd() && !(*it).isEmpty())
         return (*it).first();
@@ -1855,7 +1855,7 @@ QString QFont::substitute(const QString &familyName)
 QStringList QFont::substitutes(const QString &familyName)
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     return fontSubst->value(familyName.toLower(), QStringList());
 }
 
@@ -1870,7 +1870,7 @@ void QFont::insertSubstitution(const QString &familyName,
                                const QString &substituteName)
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     QStringList &list = (*fontSubst)[familyName.toLower()];
     QString s = substituteName.toLower();
     if (!list.contains(s))
@@ -1888,7 +1888,7 @@ void QFont::insertSubstitutions(const QString &familyName,
                                 const QStringList &substituteNames)
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     QStringList &list = (*fontSubst)[familyName.toLower()];
     for (const QString &substituteName : substituteNames) {
         const QString lowerSubstituteName = substituteName.toLower();
@@ -1906,7 +1906,7 @@ void QFont::insertSubstitutions(const QString &familyName,
 void QFont::removeSubstitutions(const QString &familyName)
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     fontSubst->remove(familyName.toLower());
 }
 
@@ -1926,7 +1926,7 @@ void QFont::removeSubstitutions(const QString &familyName)
 QStringList QFont::substitutions()
 {
     QFontSubst *fontSubst = globalFontSubst();
-    Q_ASSERT(fontSubst != 0);
+    Q_ASSERT(fontSubst != nullptr);
     QStringList ret = fontSubst->keys();
 
     ret.sort();
@@ -1940,7 +1940,7 @@ QStringList QFont::substitutions()
 */
 static quint8 get_font_bits(int version, const QFontPrivate *f)
 {
-    Q_ASSERT(f != 0);
+    Q_ASSERT(f != nullptr);
     quint8 bits = 0;
     if (f->request.style)
         bits |= 0x01;
@@ -1965,7 +1965,7 @@ static quint8 get_font_bits(int version, const QFontPrivate *f)
 
 static quint8 get_extended_font_bits(const QFontPrivate *f)
 {
-    Q_ASSERT(f != 0);
+    Q_ASSERT(f != nullptr);
     quint8 bits = 0;
     if (f->request.ignorePitch)
         bits |= 0x01;
@@ -1980,7 +1980,7 @@ static quint8 get_extended_font_bits(const QFontPrivate *f)
 */
 static void set_font_bits(int version, quint8 bits, QFontPrivate *f)
 {
-    Q_ASSERT(f != 0);
+    Q_ASSERT(f != nullptr);
     f->request.style         = (bits & 0x01) != 0 ? QFont::StyleItalic : QFont::StyleNormal;
     f->underline             = (bits & 0x02) != 0;
     f->overline              = (bits & 0x40) != 0;
@@ -1995,7 +1995,7 @@ static void set_font_bits(int version, quint8 bits, QFontPrivate *f)
 
 static void set_extended_font_bits(quint8 bits, QFontPrivate *f)
 {
-    Q_ASSERT(f != 0);
+    Q_ASSERT(f != nullptr);
     f->request.ignorePitch = (bits & 0x01) != 0;
     f->letterSpacingIsAbsolute = (bits & 0x02) != 0;
 }
@@ -2549,7 +2549,7 @@ QFontInfo &QFontInfo::operator=(const QFontInfo &fi)
 QString QFontInfo::family() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.family;
 }
 
@@ -2564,7 +2564,7 @@ QString QFontInfo::family() const
 QString QFontInfo::styleName() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.styleName;
 }
 
@@ -2576,7 +2576,7 @@ QString QFontInfo::styleName() const
 int QFontInfo::pointSize() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->fontDef.pointSize);
 }
 
@@ -2588,7 +2588,7 @@ int QFontInfo::pointSize() const
 qreal QFontInfo::pointSizeF() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.pointSize;
 }
 
@@ -2600,7 +2600,7 @@ qreal QFontInfo::pointSizeF() const
 int QFontInfo::pixelSize() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.pixelSize;
 }
 
@@ -2612,7 +2612,7 @@ int QFontInfo::pixelSize() const
 bool QFontInfo::italic() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.style != QFont::StyleNormal;
 }
 
@@ -2624,7 +2624,7 @@ bool QFontInfo::italic() const
 QFont::Style QFontInfo::style() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return (QFont::Style)engine->fontDef.style;
 }
 
@@ -2636,7 +2636,7 @@ QFont::Style QFontInfo::style() const
 int QFontInfo::weight() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->fontDef.weight;
 
 }
@@ -2701,7 +2701,7 @@ bool QFontInfo::strikeOut() const
 bool QFontInfo::fixedPitch() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 #ifdef Q_OS_MAC
     if (!engine->fontDef.fixedPitchComputed) {
         QChar ch[2] = { QLatin1Char('i'), QLatin1Char('m') };
@@ -2727,7 +2727,7 @@ bool QFontInfo::fixedPitch() const
 QFont::StyleHint QFontInfo::styleHint() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return (QFont::StyleHint) engine->fontDef.styleHint;
 }
 
@@ -2759,7 +2759,7 @@ bool QFontInfo::rawMode() const
 bool QFontInfo::exactMatch() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return d->request.exactMatch(engine->fontDef);
 }
 
@@ -2793,7 +2793,7 @@ QFontCache *QFontCache::instance()
 
 void QFontCache::cleanup()
 {
-    QThreadStorage<QFontCache *> *cache = 0;
+    QThreadStorage<QFontCache *> *cache = nullptr;
     QT_TRY {
         cache = theFontCache();
     } QT_CATCH (const std::bad_alloc &) {
@@ -2830,7 +2830,7 @@ void QFontCache::clear()
                         Q_ASSERT(engineCacheCount.value(data->engines[i]) == 0);
                         delete data->engines[i];
                     }
-                    data->engines[i] = 0;
+                    data->engines[i] = nullptr;
                 }
             }
             if (!data->ref.deref()) {
@@ -2863,7 +2863,7 @@ void QFontCache::clear()
                     FC_DEBUG("QFontCache::clear: engine %p still has refcount %d",
                              engine, engine->ref.loadRelaxed());
                 }
-                it.value().data = 0;
+                it.value().data = nullptr;
             }
         }
     } while (mightHaveEnginesLeftForCleanup);
@@ -2881,7 +2881,7 @@ QFontEngineData *QFontCache::findEngineData(const QFontDef &def) const
 {
     EngineDataCache::ConstIterator it = engineDataCache.constFind(def);
     if (it == engineDataCache.constEnd())
-        return 0;
+        return nullptr;
 
     // found
     return it.value();
@@ -2912,7 +2912,7 @@ QFontEngine *QFontCache::findEngine(const Key &key)
 {
     EngineCache::Iterator it = engineCache.find(key),
                          end = engineCache.end();
-    if (it == end) return 0;
+    if (it == end) return nullptr;
 
     Q_ASSERT(it.value().data != nullptr);
     Q_ASSERT(key.multi == (it.value().data->type() == QFontEngine::Multi));
diff --git a/src/gui/text/qfontdatabase.cpp b/src/gui/text/qfontdatabase.cpp
index 67702ab5b5..f2fd585835 100644
--- a/src/gui/text/qfontdatabase.cpp
+++ b/src/gui/text/qfontdatabase.cpp
@@ -210,7 +210,7 @@ struct QtFontStyle
 
     QtFontStyle(const Key &k)
         : key(k), bitmapScalable(false), smoothScalable(false),
-          count(0), pixelSizes(0)
+          count(0), pixelSizes(nullptr)
     {
     }
 
@@ -265,7 +265,7 @@ QtFontSize *QtFontStyle::pixelSize(unsigned short size, bool add)
             return pixelSizes + i;
     }
     if (!add)
-        return 0;
+        return nullptr;
 
     if (!pixelSizes) {
         // Most style have only one font size, we avoid waisting memory
@@ -280,13 +280,13 @@ QtFontSize *QtFontStyle::pixelSize(unsigned short size, bool add)
         pixelSizes = newPixelSizes;
     }
     pixelSizes[count].pixelSize = size;
-    pixelSizes[count].handle = 0;
+    pixelSizes[count].handle = nullptr;
     return pixelSizes + (count++);
 }
 
 struct QtFontFoundry
 {
-    QtFontFoundry(const QString &n) : name(n), count(0), styles(0) {}
+    QtFontFoundry(const QString &n) : name(n), count(0), styles(nullptr) {}
     ~QtFontFoundry() {
         while (count--)
             delete styles[count];
@@ -314,7 +314,7 @@ QtFontStyle *QtFontFoundry::style(const QtFontStyle::Key &key, const QString &st
         }
     }
     if (!create)
-        return 0;
+        return nullptr;
 
 //     qDebug("adding key (weight=%d, style=%d, oblique=%d stretch=%d) at %d", key.weight, key.style, key.oblique, key.stretch, pos);
     if (!(count % 8)) {
@@ -345,7 +345,7 @@ struct  QtFontFamily
         :
         populated(false),
         fixedPitch(false),
-        name(n), count(0), foundries(0)
+        name(n), count(0), foundries(nullptr)
     {
         memset(writingSystems, 0, sizeof(writingSystems));
     }
@@ -381,7 +381,7 @@ QtFontFoundry *QtFontFamily::foundry(const QString &f, bool create)
             return foundries[i];
     }
     if (!create)
-        return 0;
+        return nullptr;
 
     if (!(count % 8)) {
         QtFontFoundry **newFoundries = (QtFontFoundry **)
@@ -450,7 +450,7 @@ class QFontDatabasePrivate
 {
 public:
     QFontDatabasePrivate()
-        : count(0), families(0),
+        : count(0), families(nullptr),
           fallbacksCache(64)
     { }
 
@@ -469,7 +469,7 @@ public:
         while (count--)
             delete families[count];
         ::free(families);
-        families = 0;
+        families = nullptr;
         count = 0;
         // don't clear the memory fonts!
     }
@@ -505,7 +505,7 @@ void QFontDatabasePrivate::invalidate()
 
 QtFontFamily *QFontDatabasePrivate::family(const QString &f, FamilyRequestFlags flags)
 {
-    QtFontFamily *fam = 0;
+    QtFontFamily *fam = nullptr;
 
     int low = 0;
     int high = count;
@@ -645,7 +645,7 @@ static void parseFontName(const QString &name, QString &foundry, QString &family
 
 struct QtFontDesc
 {
-    inline QtFontDesc() : family(0), foundry(0), style(0), size(0) {}
+    inline QtFontDesc() : family(nullptr), foundry(nullptr), style(nullptr), size(nullptr) {}
     QtFontFamily *family;
     QtFontFoundry *foundry;
     QtFontStyle *style;
@@ -949,7 +949,7 @@ QFontEngine *loadSingleEngine(int script,
                 if (Q_UNLIKELY(!engine->supportsScript(QChar::Script(script)))) {
                     qWarning("  OpenType support missing for \"%s\", script %d",
                              qPrintable(def.family), script);
-                    return 0;
+                    return nullptr;
                 }
 
                 engine->isSmoothlyScalable = style->smoothScalable;
@@ -976,7 +976,7 @@ QFontEngine *loadSingleEngine(int script,
 +                        qPrintable(def.family), script);
                 if (engine->ref.loadRelaxed() == 0)
                     delete engine;
-                return 0;
+                return nullptr;
             }
 
             engine->isSmoothlyScalable = style->smoothScalable;
@@ -1081,9 +1081,9 @@ unsigned int bestFoundry(int script, unsigned int score, int styleStrategy,
     Q_UNUSED(script);
     Q_UNUSED(pitch);
 
-    desc->foundry = 0;
-    desc->style = 0;
-    desc->size = 0;
+    desc->foundry = nullptr;
+    desc->style = nullptr;
+    desc->size = nullptr;
 
 
     qCDebug(lcFontMatch, "  REMARK: looking for best foundry for family '%s' [%d]", family->name.toLatin1().constData(), family->count);
@@ -1104,7 +1104,7 @@ unsigned int bestFoundry(int script, unsigned int score, int styleStrategy,
         }
 
         int px = -1;
-        QtFontSize *size = 0;
+        QtFontSize *size = nullptr;
 
         // 1. see if we have an exact matching size
         if (!(styleStrategy & QFont::ForceOutline)) {
@@ -1244,10 +1244,10 @@ static int match(int script, const QFontDef &request,
              foundry_name.isEmpty() ? "-- any --" : foundry_name.toLatin1().constData(),
              script, request.weight, request.style, request.stretch, request.pixelSize, pitch);
 
-    desc->family = 0;
-    desc->foundry = 0;
-    desc->style = 0;
-    desc->size = 0;
+    desc->family = nullptr;
+    desc->foundry = nullptr;
+    desc->style = nullptr;
+    desc->size = nullptr;
 
     unsigned int score = ~0u;
 
@@ -1280,7 +1280,7 @@ static int match(int script, const QFontDef &request,
             bestFoundry(script, score, request.styleStrategy,
                         test.family, foundry_name, styleKey, request.pixelSize, pitch,
                         &test, request.styleName);
-        if (test.foundry == 0 && !foundry_name.isEmpty()) {
+        if (test.foundry == nullptr && !foundry_name.isEmpty()) {
             // the specific foundry was not found, so look for
             // any foundry matching our requirements
             newscore = bestFoundry(script, score, request.styleStrategy, test.family,
@@ -2068,7 +2068,7 @@ bool QFontDatabase::isPrivateFamily(const QString &family) const
 */
 QString QFontDatabase::writingSystemName(WritingSystem writingSystem)
 {
-    const char *name = 0;
+    const char *name = nullptr;
     switch (writingSystem) {
     case Any:
         name = QT_TRANSLATE_NOOP("QFontDatabase", "Any");
@@ -2548,7 +2548,7 @@ QStringList QFontDatabase::applicationFontFamilies(int id)
 
 QFont QFontDatabase::systemFont(QFontDatabase::SystemFont type)
 {
-    const QFont *font = 0;
+    const QFont *font = nullptr;
     if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
         switch (type) {
             case GeneralFont:
@@ -2825,7 +2825,7 @@ void QFontDatabase::load(const QFontPrivate *d, int script)
             if (fe->type() == QFontEngine::Box && !req.families.at(0).isEmpty()) {
                 if (fe->ref.loadRelaxed() == 0)
                     delete fe;
-                fe = 0;
+                fe = nullptr;
             } else {
                 if (d->dpi > 0)
                     fe->fontDef.pointSize = qreal(double((fe->fontDef.pixelSize * 72) / d->dpi));
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp
index 1668fac5a3..3ca9e9bbde 100644
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@@ -221,7 +221,7 @@ static bool qt_get_font_table_default(void *user_data, uint tag, uchar *buffer,
 
 #ifdef QT_BUILD_INTERNAL
 // for testing purpose only, not thread-safe!
-static QList<QFontEngine *> *enginesCollector = 0;
+static QList<QFontEngine *> *enginesCollector = nullptr;
 
 Q_AUTOTEST_EXPORT void QFontEngine_startCollectingEngines()
 {
@@ -234,7 +234,7 @@ Q_AUTOTEST_EXPORT QList<QFontEngine *> QFontEngine_stopCollectingEngines()
     Q_ASSERT(enginesCollector);
     QList<QFontEngine *> ret = *enginesCollector;
     delete enginesCollector;
-    enginesCollector = 0;
+    enginesCollector = nullptr;
     return ret;
 }
 #endif // QT_BUILD_INTERNAL
@@ -569,9 +569,9 @@ void QFontEngine::getGlyphPositions(const QGlyphLayout &glyphs, const QTransform
 void QFontEngine::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rightBearing)
 {
     glyph_metrics_t gi = boundingBox(glyph);
-    if (leftBearing != 0)
+    if (leftBearing != nullptr)
         *leftBearing = gi.leftBearing().toReal();
-    if (rightBearing != 0)
+    if (rightBearing != nullptr)
         *rightBearing = gi.rightBearing().toReal();
 }
 
@@ -1022,7 +1022,7 @@ QByteArray QFontEngine::getSfntTable(uint tag) const
 {
     QByteArray table;
     uint len = 0;
-    if (!getSfntTableData(tag, 0, &len))
+    if (!getSfntTableData(tag, nullptr, &len))
         return table;
     table.resize(len);
     if (!getSfntTableData(tag, reinterpret_cast<uchar *>(table.data()), &len))
@@ -1231,11 +1231,11 @@ const uchar *QFontEngine::getCMap(const uchar *table, uint tableSize, bool *isSy
     // version check
     quint16 version;
     if (!qSafeFromBigEndian(header, endPtr, &version) || version != 0)
-        return 0;
+        return nullptr;
 
     quint16 numTables;
     if (!qSafeFromBigEndian(header + 2, endPtr, &numTables))
-        return 0;
+        return nullptr;
 
     const uchar *maps = table + 4;
 
@@ -1255,11 +1255,11 @@ const uchar *QFontEngine::getCMap(const uchar *table, uint tableSize, bool *isSy
     for (int n = 0; n < numTables; ++n) {
         quint16 platformId;
         if (!qSafeFromBigEndian(maps + 8 * n, endPtr, &platformId))
-            return 0;
+            return nullptr;
 
         quint16 platformSpecificId = 0;
         if (!qSafeFromBigEndian(maps + 8 * n + 2, endPtr, &platformSpecificId))
-            return 0;
+            return nullptr;
 
         switch (platformId) {
         case 0: // Unicode
@@ -1309,38 +1309,38 @@ const uchar *QFontEngine::getCMap(const uchar *table, uint tableSize, bool *isSy
         }
     }
     if(tableToUse < 0)
-        return 0;
+        return nullptr;
 
 resolveTable:
     *isSymbolFont = (symbolTable > -1);
 
     quint32 unicode_table = 0;
     if (!qSafeFromBigEndian(maps + 8 * tableToUse + 4, endPtr, &unicode_table))
-        return 0;
+        return nullptr;
 
     if (!unicode_table)
-        return 0;
+        return nullptr;
 
     // get the header of the unicode table
     header = table + unicode_table;
 
     quint16 format;
     if (!qSafeFromBigEndian(header, endPtr, &format))
-        return 0;
+        return nullptr;
 
     quint32 length;
     if (format < 8) {
         quint16 tmp;
         if (!qSafeFromBigEndian(header + 2, endPtr, &tmp))
-            return 0;
+            return nullptr;
         length = tmp;
     } else {
         if (!qSafeFromBigEndian(header + 4, endPtr, &length))
-            return 0;
+            return nullptr;
     }
 
     if (table + unicode_table + length > endPtr)
-        return 0;
+        return nullptr;
     *cmapSize = length;
 
     // To support symbol fonts that contain a unicode table for the symbol area
@@ -1844,7 +1844,7 @@ QFontEngine *QFontEngineMulti::loadEngine(int at)
         return engine;
     }
 
-    return 0;
+    return nullptr;
 }
 
 glyph_t QFontEngineMulti::glyphIndex(uint ucs4) const
@@ -1865,7 +1865,7 @@ glyph_t QFontEngineMulti::glyphIndex(uint ucs4) const
                 const_cast<QFontEngineMulti *>(this)->ensureEngineAt(x);
                 engine = m_engines.at(x);
             }
-            Q_ASSERT(engine != 0);
+            Q_ASSERT(engine != nullptr);
             if (engine->type() == Box)
                 continue;
 
@@ -1934,7 +1934,7 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len,
                     if (!engine)
                         continue;
                 }
-                Q_ASSERT(engine != 0);
+                Q_ASSERT(engine != nullptr);
                 if (engine->type() == Box)
                     continue;
 
@@ -2308,7 +2308,7 @@ QImage QFontEngineMulti::alphaRGBMapForGlyph(glyph_t glyph, QFixed subPixelPosit
 */
 QFontEngine *QFontEngineMulti::createMultiFontEngine(QFontEngine *fe, int script)
 {
-    QFontEngine *engine = 0;
+    QFontEngine *engine = nullptr;
     QFontCache::Key key(fe->fontDef, script, /*multi = */true);
     QFontCache *fc = QFontCache::instance();
     //  We can't rely on the fontDef (and hence the cache Key)
diff --git a/src/gui/text/qfontengine_qpf2.cpp b/src/gui/text/qfontengine_qpf2.cpp
index 409176d41b..d22239c040 100644
--- a/src/gui/text/qfontengine_qpf2.cpp
+++ b/src/gui/text/qfontengine_qpf2.cpp
@@ -151,17 +151,17 @@ static inline const uchar *verifyTag(const uchar *tagPtr, const uchar *endPtr)
 const QFontEngineQPF2::Glyph *QFontEngineQPF2::findGlyph(glyph_t g) const
 {
     if (!g || g >= glyphMapEntries)
-        return 0;
+        return nullptr;
     const quint32 *gmapPtr = reinterpret_cast<const quint32 *>(fontData + glyphMapOffset);
     quint32 glyphPos = qFromBigEndian<quint32>(gmapPtr[g]);
     if (glyphPos > glyphDataSize) {
         if (glyphPos == 0xffffffff)
-            return 0;
+            return nullptr;
 #if defined(DEBUG_FONTENGINE)
         qDebug() << "glyph" << g << "outside of glyphData, remapping font file";
 #endif
         if (glyphPos > glyphDataSize)
-            return 0;
+            return nullptr;
     }
     return reinterpret_cast<const Glyph *>(fontData + glyphDataOffset + glyphPos);
 }
@@ -230,7 +230,7 @@ QFontEngineQPF2::QFontEngineQPF2(const QFontDef &def, const QByteArray &data)
 {
     fontDef = def;
     cache_cost = 100;
-    cmap = 0;
+    cmap = nullptr;
     cmapOffset = 0;
     cmapSize = 0;
     glyphMapOffset = 0;
diff --git a/src/gui/text/qfontmetrics.cpp b/src/gui/text/qfontmetrics.cpp
index 906047cdb4..a79957797d 100644
--- a/src/gui/text/qfontmetrics.cpp
+++ b/src/gui/text/qfontmetrics.cpp
@@ -282,7 +282,7 @@ bool QFontMetrics::operator ==(const QFontMetrics &other) const
 int QFontMetrics::ascent() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->ascent());
 }
 
@@ -301,7 +301,7 @@ int QFontMetrics::ascent() const
 int QFontMetrics::capHeight() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->capHeight());
 }
 
@@ -318,7 +318,7 @@ int QFontMetrics::capHeight() const
 int QFontMetrics::descent() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->descent());
 }
 
@@ -332,7 +332,7 @@ int QFontMetrics::descent() const
 int QFontMetrics::height() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->ascent()) + qRound(engine->descent());
 }
 
@@ -346,7 +346,7 @@ int QFontMetrics::height() const
 int QFontMetrics::leading() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->leading());
 }
 
@@ -360,7 +360,7 @@ int QFontMetrics::leading() const
 int QFontMetrics::lineSpacing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->leading()) + qRound(engine->ascent()) + qRound(engine->descent());
 }
 
@@ -377,7 +377,7 @@ int QFontMetrics::lineSpacing() const
 int QFontMetrics::minLeftBearing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->minLeftBearing());
 }
 
@@ -394,7 +394,7 @@ int QFontMetrics::minLeftBearing() const
 int QFontMetrics::minRightBearing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->minRightBearing());
 }
 
@@ -404,7 +404,7 @@ int QFontMetrics::minRightBearing() const
 int QFontMetrics::maxWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->maxCharWidth());
 }
 
@@ -415,7 +415,7 @@ int QFontMetrics::maxWidth() const
 int QFontMetrics::xHeight() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (d->capital == QFont::SmallCaps)
         return qRound(d->smallCapsFontPrivate()->engineForScript(QChar::Script_Common)->ascent());
     return qRound(engine->xHeight());
@@ -429,7 +429,7 @@ int QFontMetrics::xHeight() const
 int QFontMetrics::averageCharWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->averageCharWidth());
 }
 
@@ -450,7 +450,7 @@ bool QFontMetrics::inFontUcs4(uint ucs4) const
 {
     const int script = QChar::script(ucs4);
     QFontEngine *engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return false;
     return engine->canRender(ucs4);
@@ -476,7 +476,7 @@ int QFontMetrics::leftBearing(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return 0;
 
@@ -509,7 +509,7 @@ int QFontMetrics::rightBearing(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return 0;
 
@@ -518,7 +518,7 @@ int QFontMetrics::rightBearing(QChar ch) const
     glyph_t glyph = engine->glyphIndex(ch.unicode());
 
     qreal rb;
-    engine->getGlyphBearings(glyph, 0, &rb);
+    engine->getGlyphBearings(glyph, nullptr, &rb);
     return qRound(rb);
 }
 
@@ -673,7 +673,7 @@ int QFontMetrics::horizontalAdvance(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 
     d->alterCharForCapitalization(ch);
 
@@ -725,7 +725,7 @@ int QFontMetrics::charWidth(const QString &text, int pos) const
             engine = d->smallCapsFontPrivate()->engineForScript(script);
         else
             engine = d->engineForScript(script);
-        Q_ASSERT(engine != 0);
+        Q_ASSERT(engine != nullptr);
 
         d->alterCharForCapitalization(ch);
 
@@ -800,7 +800,7 @@ QRect QFontMetrics::boundingRect(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 
     d->alterCharForCapitalization(ch);
 
@@ -877,7 +877,7 @@ QRect QFontMetrics::boundingRect(const QRect &rect, int flags, const QString &te
     QRectF rb;
     QRectF rr(rect);
     qt_format_text(QFont(d.data()), rr, flags | Qt::TextDontPrint, text, &rb, tabStops, tabArray,
-                   tabArrayLen, 0);
+                   tabArrayLen, nullptr);
 
     return rb.toAlignedRect();
 }
@@ -994,7 +994,7 @@ QString QFontMetrics::elidedText(const QString &text, Qt::TextElideMode mode, in
 int QFontMetrics::underlinePos() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->underlinePosition());
 }
 
@@ -1030,7 +1030,7 @@ int QFontMetrics::strikeOutPos() const
 int QFontMetrics::lineWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return qRound(engine->lineThickness());
 }
 
@@ -1248,7 +1248,7 @@ bool QFontMetricsF::operator ==(const QFontMetricsF &other) const
 qreal QFontMetricsF::ascent() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->ascent().toReal();
 }
 
@@ -1267,7 +1267,7 @@ qreal QFontMetricsF::ascent() const
 qreal QFontMetricsF::capHeight() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->capHeight().toReal();
 }
 
@@ -1285,7 +1285,7 @@ qreal QFontMetricsF::capHeight() const
 qreal QFontMetricsF::descent() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->descent().toReal();
 }
 
@@ -1299,7 +1299,7 @@ qreal QFontMetricsF::descent() const
 qreal QFontMetricsF::height() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 
     return (engine->ascent() + engine->descent()).toReal();
 }
@@ -1314,7 +1314,7 @@ qreal QFontMetricsF::height() const
 qreal QFontMetricsF::leading() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->leading().toReal();
 }
 
@@ -1328,7 +1328,7 @@ qreal QFontMetricsF::leading() const
 qreal QFontMetricsF::lineSpacing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return (engine->leading() + engine->ascent() + engine->descent()).toReal();
 }
 
@@ -1345,7 +1345,7 @@ qreal QFontMetricsF::lineSpacing() const
 qreal QFontMetricsF::minLeftBearing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->minLeftBearing();
 }
 
@@ -1362,7 +1362,7 @@ qreal QFontMetricsF::minLeftBearing() const
 qreal QFontMetricsF::minRightBearing() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->minRightBearing();
 }
 
@@ -1372,7 +1372,7 @@ qreal QFontMetricsF::minRightBearing() const
 qreal QFontMetricsF::maxWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->maxCharWidth();
 }
 
@@ -1383,7 +1383,7 @@ qreal QFontMetricsF::maxWidth() const
 qreal QFontMetricsF::xHeight() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (d->capital == QFont::SmallCaps)
         return d->smallCapsFontPrivate()->engineForScript(QChar::Script_Common)->ascent().toReal();
     return engine->xHeight().toReal();
@@ -1397,7 +1397,7 @@ qreal QFontMetricsF::xHeight() const
 qreal QFontMetricsF::averageCharWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->averageCharWidth().toReal();
 }
 
@@ -1420,7 +1420,7 @@ bool QFontMetricsF::inFontUcs4(uint ucs4) const
 {
     const int script = QChar::script(ucs4);
     QFontEngine *engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return false;
     return engine->canRender(ucs4);
@@ -1446,7 +1446,7 @@ qreal QFontMetricsF::leftBearing(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return 0;
 
@@ -1479,7 +1479,7 @@ qreal QFontMetricsF::rightBearing(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     if (engine->type() == QFontEngine::Box)
         return 0;
 
@@ -1488,7 +1488,7 @@ qreal QFontMetricsF::rightBearing(QChar ch) const
     glyph_t glyph = engine->glyphIndex(ch.unicode());
 
     qreal rb;
-    engine->getGlyphBearings(glyph, 0, &rb);
+    engine->getGlyphBearings(glyph, nullptr, &rb);
     return rb;
 
 }
@@ -1608,7 +1608,7 @@ qreal QFontMetricsF::horizontalAdvance(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 
     d->alterCharForCapitalization(ch);
 
@@ -1679,7 +1679,7 @@ QRectF QFontMetricsF::boundingRect(QChar ch) const
         engine = d->smallCapsFontPrivate()->engineForScript(script);
     else
         engine = d->engineForScript(script);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
 
     d->alterCharForCapitalization(ch);
 
@@ -1758,7 +1758,7 @@ QRectF QFontMetricsF::boundingRect(const QRectF &rect, int flags, const QString&
 
     QRectF rb;
     qt_format_text(QFont(d.data()), rect, flags | Qt::TextDontPrint, text, &rb, tabStops, tabArray,
-                   tabArrayLen, 0);
+                   tabArrayLen, nullptr);
     return rb;
 }
 
@@ -1877,7 +1877,7 @@ QString QFontMetricsF::elidedText(const QString &text, Qt::TextElideMode mode, q
 qreal QFontMetricsF::underlinePos() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->underlinePosition().toReal();
 }
 
@@ -1912,7 +1912,7 @@ qreal QFontMetricsF::strikeOutPos() const
 qreal QFontMetricsF::lineWidth() const
 {
     QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-    Q_ASSERT(engine != 0);
+    Q_ASSERT(engine != nullptr);
     return engine->lineThickness().toReal();
 }
 
diff --git a/src/gui/text/qplatformfontdatabase.cpp b/src/gui/text/qplatformfontdatabase.cpp
index 90322b24da..02e25bb6af 100644
--- a/src/gui/text/qplatformfontdatabase.cpp
+++ b/src/gui/text/qplatformfontdatabase.cpp
@@ -368,7 +368,7 @@ QFontEngine *QPlatformFontDatabase::fontEngine(const QByteArray &fontData, qreal
     Q_UNUSED(pixelSize);
     Q_UNUSED(hintingPreference);
     qWarning("This plugin does not support font engines created directly from font data");
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/gui/text/qrawfont.cpp b/src/gui/text/qrawfont.cpp
index e04c8909f3..884525bd76 100644
--- a/src/gui/text/qrawfont.cpp
+++ b/src/gui/text/qrawfont.cpp
@@ -750,7 +750,7 @@ QRawFont QRawFont::fromFont(const QFont &font, QFontDatabase::WritingSystem writ
     int script = qt_script_for_writing_system(writingSystem);
     QFontEngine *fe = font_d->engineForScript(script);
 
-    if (fe != 0 && fe->type() == QFontEngine::Multi) {
+    if (fe != nullptr && fe->type() == QFontEngine::Multi) {
         QFontEngineMulti *multiEngine = static_cast<QFontEngineMulti *>(fe);
         fe = multiEngine->engine(0);
 
@@ -770,7 +770,7 @@ QRawFont QRawFont::fromFont(const QFont &font, QFontDatabase::WritingSystem writ
         Q_ASSERT(fe);
     }
 
-    if (fe != 0) {
+    if (fe != nullptr) {
         rawFont.d.data()->setFontEngine(fe);
         rawFont.d.data()->hintingPreference = font.hintingPreference();
     }
@@ -795,7 +795,7 @@ void QRawFont::setPixelSize(qreal pixelSize)
 void QRawFontPrivate::loadFromData(const QByteArray &fontData, qreal pixelSize,
                                            QFont::HintingPreference hintingPreference)
 {
-    Q_ASSERT(fontEngine == 0);
+    Q_ASSERT(fontEngine == nullptr);
 
     QPlatformFontDatabase *pfdb = QGuiApplicationPrivate::platformIntegration()->fontDatabase();
     setFontEngine(pfdb->fontEngine(fontData, pixelSize, hintingPreference));
diff --git a/src/gui/text/qstatictext.cpp b/src/gui/text/qstatictext.cpp
index 490e0b6b8f..e588b44efd 100644
--- a/src/gui/text/qstatictext.cpp
+++ b/src/gui/text/qstatictext.cpp
@@ -403,7 +403,7 @@ QSizeF QStaticText::size() const
 }
 
 QStaticTextPrivate::QStaticTextPrivate()
-        : textWidth(-1.0), items(0), itemCount(0), glyphPool(0), positionPool(0),
+        : textWidth(-1.0), items(nullptr), itemCount(0), glyphPool(nullptr), positionPool(nullptr),
           needsRelayout(true), useBackendOptimizations(false), textFormat(Qt::AutoText),
           untransformedCoordinates(false)
 {
@@ -411,7 +411,7 @@ QStaticTextPrivate::QStaticTextPrivate()
 
 QStaticTextPrivate::QStaticTextPrivate(const QStaticTextPrivate &other)
     : text(other.text), font(other.font), textWidth(other.textWidth), matrix(other.matrix),
-      items(0), itemCount(0), glyphPool(0), positionPool(0), textOption(other.textOption),
+      items(nullptr), itemCount(0), glyphPool(nullptr), positionPool(nullptr), textOption(other.textOption),
       needsRelayout(true), useBackendOptimizations(other.useBackendOptimizations),
       textFormat(other.textFormat), untransformedCoordinates(other.untransformedCoordinates)
 {
diff --git a/src/gui/text/qsyntaxhighlighter.cpp b/src/gui/text/qsyntaxhighlighter.cpp
index cf584f6980..c345e89a21 100644
--- a/src/gui/text/qsyntaxhighlighter.cpp
+++ b/src/gui/text/qsyntaxhighlighter.cpp
@@ -321,7 +321,7 @@ QSyntaxHighlighter::QSyntaxHighlighter(QTextDocument *parent)
 */
 QSyntaxHighlighter::~QSyntaxHighlighter()
 {
-    setDocument(0);
+    setDocument(nullptr);
 }
 
 /*!
@@ -601,7 +601,7 @@ QTextBlockUserData *QSyntaxHighlighter::currentBlockUserData() const
 {
     Q_D(const QSyntaxHighlighter);
     if (!d->currentBlock.isValid())
-        return 0;
+        return nullptr;
 
     return d->currentBlock.userData();
 }
diff --git a/src/gui/text/qtextcursor.cpp b/src/gui/text/qtextcursor.cpp
index c88497840f..b69b94d4e7 100644
--- a/src/gui/text/qtextcursor.cpp
+++ b/src/gui/text/qtextcursor.cpp
@@ -371,7 +371,7 @@ bool QTextCursorPrivate::movePosition(QTextCursor::MoveOperation op, QTextCursor
 
     int newPosition = position;
 
-    if (mode == QTextCursor::KeepAnchor && complexSelectionTable() != 0) {
+    if (mode == QTextCursor::KeepAnchor && complexSelectionTable() != nullptr) {
         if ((op >= QTextCursor::EndOfLine && op <= QTextCursor::NextWord)
                 || (op >= QTextCursor::Right && op <= QTextCursor::WordRight)) {
             QTextTable *t = qobject_cast<QTextTable *>(priv->frameAt(position));
@@ -671,7 +671,7 @@ bool QTextCursorPrivate::movePosition(QTextCursor::MoveOperation op, QTextCursor
 QTextTable *QTextCursorPrivate::complexSelectionTable() const
 {
     if (position == anchor)
-        return 0;
+        return nullptr;
 
     QTextTable *t = qobject_cast<QTextTable *>(priv->frameAt(position));
     if (t) {
@@ -681,7 +681,7 @@ QTextTable *QTextCursorPrivate::complexSelectionTable() const
         Q_ASSERT(cell_anchor.isValid());
 
         if (cell_pos == cell_anchor)
-            t = 0;
+            t = nullptr;
     }
     return t;
 }
@@ -1044,7 +1044,7 @@ QTextLayout *QTextCursorPrivate::blockLayout(QTextBlock &block) const{
     Constructs a null cursor.
  */
 QTextCursor::QTextCursor()
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -1623,7 +1623,7 @@ bool QTextCursor::hasComplexSelection() const
     if (!d)
         return false;
 
-    return d->complexSelectionTable() != 0;
+    return d->complexSelectionTable() != nullptr;
 }
 
 /*!
@@ -2111,7 +2111,7 @@ QTextList *QTextCursor::insertList(QTextListFormat::Style style)
 QTextList *QTextCursor::createList(const QTextListFormat &format)
 {
     if (!d || !d->priv)
-        return 0;
+        return nullptr;
 
     QTextList *list = static_cast<QTextList *>(d->priv->createObject(format));
     QTextBlockFormat modifier;
@@ -2146,7 +2146,7 @@ QTextList *QTextCursor::createList(QTextListFormat::Style style)
 QTextList *QTextCursor::currentList() const
 {
     if (!d || !d->priv)
-        return 0;
+        return nullptr;
 
     QTextBlockFormat b = blockFormat();
     QTextObject *o = d->priv->objectForFormat(b);
@@ -2186,7 +2186,7 @@ QTextTable *QTextCursor::insertTable(int rows, int cols)
 QTextTable *QTextCursor::insertTable(int rows, int cols, const QTextTableFormat &format)
 {
     if(!d || !d->priv || rows == 0 || cols == 0)
-        return 0;
+        return nullptr;
 
     int pos = d->position;
     QTextTable *t = QTextTablePrivate::createTable(d->priv, d->position, rows, cols, format);
@@ -2206,7 +2206,7 @@ QTextTable *QTextCursor::insertTable(int rows, int cols, const QTextTableFormat
 QTextTable *QTextCursor::currentTable() const
 {
     if(!d || !d->priv)
-        return 0;
+        return nullptr;
 
     QTextFrame *frame = d->priv->frameAt(d->position);
     while (frame) {
@@ -2215,7 +2215,7 @@ QTextTable *QTextCursor::currentTable() const
             return table;
         frame = frame->parentFrame();
     }
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -2230,7 +2230,7 @@ QTextTable *QTextCursor::currentTable() const
 QTextFrame *QTextCursor::insertFrame(const QTextFrameFormat &format)
 {
     if (!d || !d->priv)
-        return 0;
+        return nullptr;
 
     return d->priv->insertFrame(selectionStart(), selectionEnd(), format);
 }
@@ -2243,7 +2243,7 @@ QTextFrame *QTextCursor::insertFrame(const QTextFrameFormat &format)
 QTextFrame *QTextCursor::currentFrame() const
 {
     if(!d || !d->priv)
-        return 0;
+        return nullptr;
 
     return d->priv->frameAt(d->position);
 }
@@ -2603,7 +2603,7 @@ QTextDocument *QTextCursor::document() const
 {
     if (d->priv)
         return d->priv->document();
-    return 0; // document went away
+    return nullptr; // document went away
 }
 
 QT_END_NAMESPACE
diff --git a/src/gui/text/qtextdocument.cpp b/src/gui/text/qtextdocument.cpp
index e94f635651..3382ec0b69 100644
--- a/src/gui/text/qtextdocument.cpp
+++ b/src/gui/text/qtextdocument.cpp
@@ -1666,7 +1666,7 @@ QTextCursor QTextDocument::find(const QRegularExpression &expr, const QTextCurso
 */
 QTextObject *QTextDocument::createObject(const QTextFormat &f)
 {
-    QTextObject *obj = 0;
+    QTextObject *obj = nullptr;
     if (f.isListFormat())
         obj = new QTextList(this);
     else if (f.isTableFormat())
@@ -2408,7 +2408,7 @@ bool QTextHtmlExporter::emitCharFormatStyle(const QTextCharFormat &format)
             sizeof("small") + sizeof("medium") + 1,    // "x-large"  )> compressed into "xx-large"
             sizeof("small") + sizeof("medium"),        // "xx-large" )
         };
-        const char *name = 0;
+        const char *name = nullptr;
         const int idx = format.intProperty(QTextFormat::FontSizeAdjustment) + 1;
         if (idx >= 0 && idx <= 4) {
             name = sizeNameData + sizeNameOffsets[idx];
@@ -3256,7 +3256,7 @@ void QTextHtmlExporter::emitFrame(const QTextFrame::Iterator &frameIt)
         QTextFrame::Iterator next = frameIt;
         ++next;
         if (next.atEnd()
-            && frameIt.currentFrame() == 0
+            && frameIt.currentFrame() == nullptr
             && frameIt.parentFrame() != doc->rootFrame()
             && frameIt.currentBlock().begin().atEnd())
             return;
diff --git a/src/gui/text/qtextdocument_p.cpp b/src/gui/text/qtextdocument_p.cpp
index 2f02f62a57..524931ebde 100644
--- a/src/gui/text/qtextdocument_p.cpp
+++ b/src/gui/text/qtextdocument_p.cpp
@@ -185,7 +185,7 @@ QTextDocumentPrivate::QTextDocumentPrivate()
     docChangeOldLength(0),
     docChangeLength(0),
     framesDirty(true),
-    rtFrame(0),
+    rtFrame(nullptr),
     initialBlockCharFormatIndex(-1) // set correctly later in init()
 {
     editBlock = 0;
@@ -195,7 +195,7 @@ QTextDocumentPrivate::QTextDocumentPrivate()
     undoState = 0;
     revision = -1; // init() inserts a block, bringing it to 0
 
-    lout = 0;
+    lout = nullptr;
 
     modified = false;
     modifiedState = 0;
@@ -272,7 +272,7 @@ void QTextDocumentPrivate::clear()
         blocks.clear();
         cachedResources.clear();
         delete rtFrame;
-        rtFrame = 0;
+        rtFrame = nullptr;
         init();
         cursors = oldCursors;
         {
@@ -290,7 +290,7 @@ void QTextDocumentPrivate::clear()
 QTextDocumentPrivate::~QTextDocumentPrivate()
 {
     for (QTextCursorPrivate *curs : qAsConst(cursors))
-        curs->priv = 0;
+        curs->priv = nullptr;
     cursors.clear();
     undoState = 0;
     undoEnabled = true;
@@ -643,7 +643,7 @@ void QTextDocumentPrivate::move(int pos, int to, int length, QTextUndoCommand::O
 //          qDebug("remove_block at %d", key);
             Q_ASSERT(X->size_array[0] == 1 && isValidBlockSeparator(text.at(X->stringPosition)));
             b = blocks.previous(b);
-            B = 0;
+            B = nullptr;
             c.command = blocks.size(b) == 1 ? QTextUndoCommand::BlockDeleted : QTextUndoCommand::BlockRemoved;
             w = remove_block(key, &c.blockFormat, QTextUndoCommand::BlockAdded, op);
 
@@ -1437,7 +1437,7 @@ static QTextFrame *findChildFrame(QTextFrame *f, int pos)
         else
             return c;
     }
-    return 0;
+    return nullptr;
 }
 
 QTextFrame *QTextDocumentPrivate::rootFrame() const
@@ -1467,7 +1467,7 @@ void QTextDocumentPrivate::clearFrame(QTextFrame *f)
     for (int i = 0; i < f->d_func()->childFrames.count(); ++i)
         clearFrame(f->d_func()->childFrames.at(i));
     f->d_func()->childFrames.clear();
-    f->d_func()->parentFrame = 0;
+    f->d_func()->parentFrame = nullptr;
 }
 
 void QTextDocumentPrivate::scan_frames(int pos, int charsRemoved, int charsAdded)
@@ -1551,7 +1551,7 @@ QTextFrame *QTextDocumentPrivate::insertFrame(int start, int end, const QTextFra
     Q_ASSERT(start <= end || end == -1);
 
     if (start != end && frameAt(start) != frameAt(end))
-        return 0;
+        return nullptr;
 
     beginEditBlock();
 
@@ -1599,7 +1599,7 @@ void QTextDocumentPrivate::removeFrame(QTextFrame *frame)
 QTextObject *QTextDocumentPrivate::objectForIndex(int objectIndex) const
 {
     if (objectIndex < 0)
-        return 0;
+        return nullptr;
 
     QTextObject *object = objects.value(objectIndex, 0);
     if (!object) {
diff --git a/src/gui/text/qtextdocumentfragment.cpp b/src/gui/text/qtextdocumentfragment.cpp
index 742c56382d..d7bc707491 100644
--- a/src/gui/text/qtextdocumentfragment.cpp
+++ b/src/gui/text/qtextdocumentfragment.cpp
@@ -277,7 +277,7 @@ void QTextDocumentFragmentPrivate::insert(QTextCursor &_cursor) const
     \sa isEmpty()
 */
 QTextDocumentFragment::QTextDocumentFragment()
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -287,7 +287,7 @@ QTextDocumentFragment::QTextDocumentFragment()
     like the document's title.
 */
 QTextDocumentFragment::QTextDocumentFragment(const QTextDocument *document)
-    : d(0)
+    : d(nullptr)
 {
     if (!document)
         return;
@@ -304,7 +304,7 @@ QTextDocumentFragment::QTextDocumentFragment(const QTextDocument *document)
     \sa isEmpty(), QTextCursor::selection()
 */
 QTextDocumentFragment::QTextDocumentFragment(const QTextCursor &cursor)
-    : d(0)
+    : d(nullptr)
 {
     if (!cursor.hasSelection())
         return;
@@ -678,7 +678,7 @@ QTextHtmlImporter::ProcessNodeResult QTextHtmlImporter::processSpecialNodes()
                     if (n->parent)
                         n = &at(n->parent);
                     else
-                        n = 0;
+                        n = nullptr;
                 }
             }
 
@@ -793,7 +793,7 @@ bool QTextHtmlImporter::closeTag()
     bool blockTagClosed = false;
 
     while (depth > endDepth) {
-        Table *t = 0;
+        Table *t = nullptr;
         if (!tables.isEmpty())
             t = &tables.last();
 
@@ -816,7 +816,7 @@ bool QTextHtmlImporter::closeTag()
                 indent = t->lastIndent;
 
                 tables.resize(tables.size() - 1);
-                t = 0;
+                t = nullptr;
 
                 if (tables.isEmpty()) {
                     cursor = doc->rootFrame()->lastCursorPosition();
@@ -1123,7 +1123,7 @@ QTextHtmlImporter::ProcessNodeResult QTextHtmlImporter::processBlockNode()
 
     // for list items we may want to collapse with the bottom margin of the
     // list.
-    const QTextHtmlParserNode *parentNode = currentNode->parent ? &at(currentNode->parent) : 0;
+    const QTextHtmlParserNode *parentNode = currentNode->parent ? &at(currentNode->parent) : nullptr;
     if ((currentNode->id == Html_li || currentNode->id == Html_dt || currentNode->id == Html_dd)
         && parentNode
         && (parentNode->isListStart() || parentNode->id == Html_dl)
@@ -1270,7 +1270,7 @@ void QTextHtmlImporter::appendBlock(const QTextBlockFormat &format, QTextCharFor
 
 QTextDocumentFragment QTextDocumentFragment::fromHtml(const QString &html)
 {
-    return fromHtml(html, 0);
+    return fromHtml(html, nullptr);
 }
 
 /*!
diff --git a/src/gui/text/qtextdocumentlayout.cpp b/src/gui/text/qtextdocumentlayout.cpp
index ed23a4d8d9..e21a8d8d52 100644
--- a/src/gui/text/qtextdocumentlayout.cpp
+++ b/src/gui/text/qtextdocumentlayout.cpp
@@ -111,7 +111,7 @@ public:
 
 QTextFrameData::QTextFrameData()
     : maximumWidth(QFIXED_MAX),
-      currentLayoutStruct(0), sizeDirty(true), layoutDirty(true)
+      currentLayoutStruct(nullptr), sizeDirty(true), layoutDirty(true)
 {
 }
 
@@ -571,7 +571,7 @@ public:
     void setCellPosition(QTextTable *t, const QTextTableCell &cell, const QPointF &pos);
     QRectF layoutTable(QTextTable *t, int layoutFrom, int layoutTo, QFixed parentY);
 
-    void positionFloat(QTextFrame *frame, QTextLine *currentLine = 0);
+    void positionFloat(QTextFrame *frame, QTextLine *currentLine = nullptr);
 
     // calls the next one
     QRectF layoutFrame(QTextFrame *f, int layoutFrom, int layoutTo, QFixed parentY = 0);
@@ -1554,7 +1554,7 @@ static inline double prioritizedEdgeAnchorOffset(const QTextDocumentLayoutPrivat
             competingCell = adjacentCell(table, cell, orthogonalEdge);
             if (competingCell.isValid()) {
                 checkJoinedEdge(table, td, competingCell, edgeData.edge, edgeData, couldHaveContinuation,
-                                &maxCompetingEdgeData, 0);
+                                &maxCompetingEdgeData, nullptr);
             }
         }
 
@@ -1946,7 +1946,7 @@ void QTextDocumentLayoutPrivate::drawFlow(const QPointF &offset, QPainter *paint
                                           QTextFrame::Iterator it, const QList<QTextFrame *> &floats, QTextBlock *cursorBlockNeedingRepaint) const
 {
     Q_Q(const QTextDocumentLayout);
-    const bool inRootFrame = (!it.atEnd() && it.parentFrame() && it.parentFrame()->parentFrame() == 0);
+    const bool inRootFrame = (!it.atEnd() && it.parentFrame() && it.parentFrame()->parentFrame() == nullptr);
 
     QVector<QCheckPoint>::ConstIterator lastVisibleCheckPoint = checkPoints.end();
     if (inRootFrame && context.clip.isValid()) {
@@ -1954,7 +1954,7 @@ void QTextDocumentLayoutPrivate::drawFlow(const QPointF &offset, QPainter *paint
     }
 
     QTextBlock previousBlock;
-    QTextFrame *previousFrame = 0;
+    QTextFrame *previousFrame = nullptr;
 
     for (; !it.atEnd(); ++it) {
         QTextFrame *c = it.currentFrame();
@@ -2050,7 +2050,7 @@ void QTextDocumentLayoutPrivate::drawBlock(const QPointF &offset, QPainter *pain
     QVector<QTextLayout::FormatRange> selections;
     int blpos = bl.position();
     int bllen = bl.length();
-    const QTextCharFormat *selFormat = 0;
+    const QTextCharFormat *selFormat = nullptr;
     for (int i = 0; i < context.selections.size(); ++i) {
         const QAbstractTextDocumentLayout::Selection &range = context.selections.at(i);
         const int selStart = range.cursor.selectionStart() - blpos;
@@ -2920,7 +2920,7 @@ QRectF QTextDocumentLayoutPrivate::layoutFrame(QTextFrame *f, int layoutFrom, in
     QTextFrameFormat fformat = f->frameFormat();
 
     QTextFrame *parent = f->parentFrame();
-    const QTextFrameData *pd = parent ? data(parent) : 0;
+    const QTextFrameData *pd = parent ? data(parent) : nullptr;
 
     const qreal maximumWidth = qMax(qreal(0), pd ? pd->contentsWidth.toReal() : document->pageSize().width());
     QFixed width = QFixed::fromReal(fformat.width().value(maximumWidth));
@@ -2971,7 +2971,7 @@ QRectF QTextDocumentLayoutPrivate::layoutFrame(QTextFrame *f, int layoutFrom, in
         }
 
         QTextFrame *parent = f->parentFrame();
-        const QTextFrameData *pd = parent ? data(parent) : 0;
+        const QTextFrameData *pd = parent ? data(parent) : nullptr;
 
         // accumulate top and bottom margins
         if (parent) {
@@ -3296,7 +3296,7 @@ void QTextDocumentLayoutPrivate::layoutFlow(QTextFrame::Iterator it, QTextLayout
             const QFixed origMaximumWidth = layoutStruct->maximumWidth;
             layoutStruct->maximumWidth = 0;
 
-            const QTextBlockFormat *previousBlockFormatPtr = 0;
+            const QTextBlockFormat *previousBlockFormatPtr = nullptr;
             if (lastIt.currentBlock().isValid())
                 previousBlockFormatPtr = &previousBlockFormat;
 
@@ -3405,7 +3405,7 @@ void QTextDocumentLayoutPrivate::layoutFlow(QTextFrame::Iterator it, QTextLayout
     }
 
 
-    fd->currentLayoutStruct = 0;
+    fd->currentLayoutStruct = nullptr;
 }
 
 static inline void getLineHeightParams(const QTextBlockFormat &blockFormat, const QTextLine &line, qreal scaling,
@@ -3865,7 +3865,7 @@ int QTextDocumentLayout::hitTest(const QPointF &point, Qt::HitTestAccuracy accur
     d->ensureLayouted(QFixed::fromReal(point.y()));
     QTextFrame *f = d->docPrivate->rootFrame();
     int position = 0;
-    QTextLayout *l = 0;
+    QTextLayout *l = nullptr;
     QFixedPoint pointf;
     pointf.x = QFixed::fromReal(point.x());
     pointf.y = QFixed::fromReal(point.y());
@@ -3944,7 +3944,7 @@ void QTextDocumentLayout::positionInlineObject(QTextInlineObject item, int posIn
         line = b.layout()->lineAt(b.layout()->lineCount()-1);
 //     qDebug() << "layoutObject: line.isValid" << line.isValid() << b.position() << b.length() <<
 //         frame->firstPosition() << frame->lastPosition();
-    d->positionFloat(frame, line.isValid() ? &line : 0);
+    d->positionFloat(frame, line.isValid() ? &line : nullptr);
 }
 
 void QTextDocumentLayout::drawInlineObject(QPainter *p, const QRectF &rect, QTextInlineObject item,
diff --git a/src/gui/text/qtextdocumentwriter.cpp b/src/gui/text/qtextdocumentwriter.cpp
index 193d2c0dd3..0bafa5d9ff 100644
--- a/src/gui/text/qtextdocumentwriter.cpp
+++ b/src/gui/text/qtextdocumentwriter.cpp
@@ -107,7 +107,7 @@ public:
     \internal
 */
 QTextDocumentWriterPrivate::QTextDocumentWriterPrivate(QTextDocumentWriter *qq)
-    : device(0),
+    : device(nullptr),
     deleteDevice(false),
 #if QT_CONFIG(textcodec)
     codec(QTextCodec::codecForName("utf-8")),
@@ -320,7 +320,7 @@ bool QTextDocumentWriter::write(const QTextDocument *document)
 */
 bool QTextDocumentWriter::write(const QTextDocumentFragment &fragment)
 {
-    if (fragment.d == 0)
+    if (fragment.d == nullptr)
         return false; // invalid fragment.
     QTextDocument *doc = fragment.d->doc;
     if (doc)
@@ -337,7 +337,7 @@ bool QTextDocumentWriter::write(const QTextDocumentFragment &fragment)
 #if QT_CONFIG(textcodec)
 void QTextDocumentWriter::setCodec(QTextCodec *codec)
 {
-    if (codec == 0)
+    if (codec == nullptr)
         codec = QTextCodec::codecForName("UTF-8");
     Q_ASSERT(codec);
     d->codec = codec;
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index 8a91b34b7a..0024f070ea 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -72,7 +72,7 @@ public:
         : m_string(string),
         m_analysis(analysis),
         m_items(items),
-        m_splitter(0)
+        m_splitter(nullptr)
     {
     }
     ~Itemizer()
@@ -138,7 +138,7 @@ private:
         if (!m_splitter)
             m_splitter = new QTextBoundaryFinder(QTextBoundaryFinder::Word,
                                                  m_string.constData(), m_string.length(),
-                                                 /*buffer*/0, /*buffer size*/0);
+                                                 /*buffer*/nullptr, /*buffer size*/0);
 
         m_splitter->setPosition(start);
         QScriptAnalysis itemAnalysis = m_analysis[start];
@@ -1680,8 +1680,8 @@ int QTextEngine::shapeTextWithHarfbuzzNG(const QScriptItem &si,
         QGlyphLayout g = availableGlyphs(&si).mid(glyphs_shaped, num_glyphs);
         ushort *log_clusters = logClusters(&si) + item_pos;
 
-        hb_glyph_info_t *infos = hb_buffer_get_glyph_infos(buffer, 0);
-        hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(buffer, 0);
+        hb_glyph_info_t *infos = hb_buffer_get_glyph_infos(buffer, nullptr);
+        hb_glyph_position_t *positions = hb_buffer_get_glyph_positions(buffer, nullptr);
         uint str_pos = 0;
         uint last_cluster = ~0u;
         uint last_glyph_pos = glyphs_shaped;
@@ -1917,12 +1917,12 @@ void QTextEngine::init(QTextEngine *e)
     e->visualMovement = false;
     e->delayDecorations = false;
 
-    e->layoutData = 0;
+    e->layoutData = nullptr;
 
     e->minWidth = 0;
     e->maxWidth = 0;
 
-    e->specialData = 0;
+    e->specialData = nullptr;
     e->stackEngine = false;
 #ifndef QT_NO_RAWFONT
     e->useRawFont = false;
@@ -1956,7 +1956,7 @@ const QCharAttributes *QTextEngine::attributes() const
 
     itemize();
     if (! ensureSpace(layoutData->string.length()))
-        return NULL;
+        return nullptr;
 
     QVarLengthArray<QUnicodeTools::ScriptItem> scriptItems(layoutData->items.size());
     for (int i = 0; i < layoutData->items.size(); ++i) {
@@ -2148,7 +2148,7 @@ void QTextEngine::itemize() const
             if (it == end || format != frag->format) {
                 if (s && position >= s->preeditPosition) {
                     position += s->preeditText.length();
-                    s = 0;
+                    s = nullptr;
                 }
                 Q_ASSERT(position <= length);
                 QFont::Capitalization capitalization =
@@ -2443,8 +2443,8 @@ QTextEngine::FontEngineCache::FontEngineCache()
 //input is common (and hard to cache at a higher level)
 QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFixed *descent, QFixed *leading) const
 {
-    QFontEngine *engine = 0;
-    QFontEngine *scaledEngine = 0;
+    QFontEngine *engine = nullptr;
+    QFontEngine *scaledEngine = nullptr;
     int script = si.analysis.script;
 
     QFont font = fnt;
@@ -2459,7 +2459,7 @@ QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFix
             engine->ref.ref();
             if (feCache.prevScaledFontEngine) {
                 releaseCachedFontEngine(feCache.prevScaledFontEngine);
-                feCache.prevScaledFontEngine = 0;
+                feCache.prevScaledFontEngine = nullptr;
             }
         }
         if (si.analysis.flags == QScriptAnalysis::SmallCaps) {
@@ -2538,7 +2538,7 @@ QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFix
                 feCache.prevScript = script;
                 feCache.prevPosition = -1;
                 feCache.prevLength = -1;
-                feCache.prevScaledFontEngine = 0;
+                feCache.prevScaledFontEngine = nullptr;
             }
         }
 
@@ -2808,14 +2808,14 @@ void QScriptLine::setDefaultHeight(QTextEngine *eng)
 
 QTextEngine::LayoutData::LayoutData()
 {
-    memory = 0;
+    memory = nullptr;
     allocated = 0;
     memory_on_stack = false;
     used = 0;
     hasBidi = false;
     layoutState = LayoutEmpty;
     haveCharAttributes = false;
-    logClustersPtr = 0;
+    logClustersPtr = nullptr;
     available_glyphs = 0;
 }
 
@@ -2833,8 +2833,8 @@ QTextEngine::LayoutData::LayoutData(const QString &str, void **stack_memory, int
         allocated = 0;
 
         memory_on_stack = false;
-        memory = 0;
-        logClustersPtr = 0;
+        memory = nullptr;
+        logClustersPtr = nullptr;
     } else {
         memory_on_stack = true;
         memory = stack_memory;
@@ -2855,7 +2855,7 @@ QTextEngine::LayoutData::~LayoutData()
 {
     if (!memory_on_stack)
         free(memory);
-    memory = 0;
+    memory = nullptr;
 }
 
 bool QTextEngine::LayoutData::reallocate(int totalGlyphs)
@@ -2879,7 +2879,7 @@ bool QTextEngine::LayoutData::reallocate(int totalGlyphs)
         return false;
     }
 
-    void **newMem = (void **)::realloc(memory_on_stack ? 0 : memory, newAllocated*sizeof(void *));
+    void **newMem = (void **)::realloc(memory_on_stack ? nullptr : memory, newAllocated*sizeof(void *));
     if (!newMem) {
         layoutState = LayoutFailed;
         return false;
@@ -2928,7 +2928,7 @@ void QTextEngine::freeMemory()
 {
     if (!stackEngine) {
         delete layoutData;
-        layoutData = 0;
+        layoutData = nullptr;
     } else {
         layoutData->used = 0;
         layoutData->hasBidi = false;
@@ -3035,7 +3035,7 @@ void QTextEngine::setPreeditArea(int position, const QString &preeditText)
             return;
         if (specialData->formats.isEmpty()) {
             delete specialData;
-            specialData = 0;
+            specialData = nullptr;
         } else {
             specialData->preeditText = QString();
             specialData->preeditPosition = -1;
@@ -3057,7 +3057,7 @@ void QTextEngine::setFormats(const QVector<QTextLayout::FormatRange> &formats)
             return;
         if (specialData->preeditText.isEmpty()) {
             delete specialData;
-            specialData = 0;
+            specialData = nullptr;
         } else {
             specialData->formats.clear();
         }
@@ -4004,7 +4004,7 @@ QTextLineItemIterator::QTextLineItemIterator(QTextEngine *_eng, int _lineNum, co
                                              const QTextLayout::FormatRange *_selection)
     : eng(_eng),
       line(eng->lines[_lineNum]),
-      si(0),
+      si(nullptr),
       lineNum(_lineNum),
       lineEnd(line.from + line.length),
       firstItem(eng->findItem(line.from)),
diff --git a/src/gui/text/qtexthtmlparser.cpp b/src/gui/text/qtexthtmlparser.cpp
index b867f42480..3b9f2d253e 100644
--- a/src/gui/text/qtexthtmlparser.cpp
+++ b/src/gui/text/qtexthtmlparser.cpp
@@ -463,7 +463,7 @@ static const QTextHtmlElement *lookupElementHelper(const QString &element)
     const QTextHtmlElement *end = &elements[Html_NumElements];
     const QTextHtmlElement *e = std::lower_bound(start, end, element);
     if ((e == end) || (element < *e))
-        return 0;
+        return nullptr;
     return e;
 }
 
@@ -519,7 +519,7 @@ void QTextHtmlParser::dumpHtml()
 QTextHtmlParserNode *QTextHtmlParser::newNode(int parent)
 {
     QTextHtmlParserNode *lastNode = &nodes.last();
-    QTextHtmlParserNode *newNode = 0;
+    QTextHtmlParserNode *newNode = nullptr;
 
     bool reuseLastNode = true;
 
@@ -2123,7 +2123,7 @@ QVector<QCss::Declaration> QTextHtmlParser::declarationsForNode(int node) const
     QCss::StyleSelector::NodePtr n;
     n.id = node;
 
-    const char *extraPseudo = 0;
+    const char *extraPseudo = nullptr;
     if (nodes.at(node).id == Html_a && nodes.at(node).hasHref)
         extraPseudo = "link";
     // Ensure that our own style is taken into consideration
diff --git a/src/gui/text/qtextimagehandler.cpp b/src/gui/text/qtextimagehandler.cpp
index f7117bfe0a..14018f34da 100644
--- a/src/gui/text/qtextimagehandler.cpp
+++ b/src/gui/text/qtextimagehandler.cpp
@@ -246,7 +246,7 @@ QSizeF QTextImageHandler::intrinsicSize(QTextDocument *doc, int posInDocument, c
 
 QImage QTextImageHandler::image(QTextDocument *doc, const QTextImageFormat &imageFormat)
 {
-    Q_ASSERT(doc != 0);
+    Q_ASSERT(doc != nullptr);
 
     return getImage(doc, imageFormat);
 }
diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index a3e194f835..fc256d72f3 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -1649,7 +1649,7 @@ namespace {
     struct LineBreakHelper
     {
         LineBreakHelper()
-            : glyphCount(0), maxGlyphs(0), currentPosition(0), fontEngine(0), logClusters(0),
+            : glyphCount(0), maxGlyphs(0), currentPosition(0), fontEngine(nullptr), logClusters(nullptr),
               manualWrap(false), whiteSpaceOrObject(true)
         {
         }
@@ -1705,7 +1705,7 @@ namespace {
         inline void calculateRightBearing(QFontEngine *engine, glyph_t glyph)
         {
             qreal rb;
-            engine->getGlyphBearings(glyph, 0, &rb);
+            engine->getGlyphBearings(glyph, nullptr, &rb);
 
             // We only care about negative right bearings, so we limit the range
             // of the bearing here so that we can assume it's negative in the rest
@@ -2212,7 +2212,7 @@ static QGlyphRun glyphRunWithInfo(QFontEngine *fontEngine,
                                   int textPosition,
                                   int textLength)
 {
-    Q_ASSERT(logClusters != 0);
+    Q_ASSERT(logClusters != nullptr);
 
     QGlyphRun glyphRun;
 
@@ -2593,7 +2593,7 @@ void QTextLine::draw(QPainter *p, const QPointF &pos, const QTextLayout::FormatR
                 } else { // si.isTab
                     QFont f = eng->font(si);
                     QTextItemInt gf(si, &f, format);
-                    gf.chars = 0;
+                    gf.chars = nullptr;
                     gf.num_chars = 0;
                     gf.width = iterator.itemWidth;
                     QPainterPrivate::get(p)->drawTextItem(QPointF(iterator.x.toReal(), y.toReal()), gf, eng);
diff --git a/src/gui/text/qtextobject.cpp b/src/gui/text/qtextobject.cpp
index b845889c3d..77dcae0dc8 100644
--- a/src/gui/text/qtextobject.cpp
+++ b/src/gui/text/qtextobject.cpp
@@ -596,7 +596,7 @@ void QTextFramePrivate::remove_me()
     parentFrame->d_func()->childFrames.removeAt(index);
 
     childFrames.clear();
-    parentFrame = 0;
+    parentFrame = nullptr;
 }
 
 /*!
@@ -654,10 +654,10 @@ QTextFrame::iterator QTextFrame::end() const
 */
 QTextFrame::iterator::iterator()
 {
-    f = 0;
+    f = nullptr;
     b = 0;
     e = 0;
-    cf = 0;
+    cf = nullptr;
     cb = 0;
 }
 
@@ -669,7 +669,7 @@ QTextFrame::iterator::iterator(QTextFrame *frame, int block, int begin, int end)
     f = frame;
     b = begin;
     e = end;
-    cf = 0;
+    cf = nullptr;
     cb = block;
 }
 
@@ -739,7 +739,7 @@ QTextFrame::iterator &QTextFrame::iterator::operator++()
     if (cf) {
         int end = cf->lastPosition() + 1;
         cb = map.findNode(end);
-        cf = 0;
+        cf = nullptr;
     } else if (cb) {
         cb = map.next(cb);
         if (cb == e)
@@ -777,7 +777,7 @@ QTextFrame::iterator &QTextFrame::iterator::operator--()
     if (cf) {
         int start = cf->firstPosition() - 1;
         cb = map.findNode(start);
-        cf = 0;
+        cf = nullptr;
     } else {
         if (cb == b)
             goto end;
@@ -907,7 +907,7 @@ QTextBlockUserData::~QTextBlockUserData()
 
 bool QTextBlock::isValid() const
 {
-    return p != 0 && p->blockMap().isValid(n);
+    return p != nullptr && p->blockMap().isValid(n);
 }
 
 /*!
@@ -1079,7 +1079,7 @@ bool QTextBlock::contains(int position) const
 QTextLayout *QTextBlock::layout() const
 {
     if (!p || !n)
-        return 0;
+        return nullptr;
 
     const QTextBlockData *b = p->blockMap().fragment(n);
     if (!b->layout)
diff --git a/src/gui/text/qtextodfwriter.cpp b/src/gui/text/qtextodfwriter.cpp
index 0e8666565f..408e3ec167 100644
--- a/src/gui/text/qtextodfwriter.cpp
+++ b/src/gui/text/qtextodfwriter.cpp
@@ -70,7 +70,7 @@ static QString pixelToPoint(qreal pixels)
 // strategies
 class QOutputStrategy {
 public:
-    QOutputStrategy() : contentStream(0), counter(1) { }
+    QOutputStrategy() : contentStream(nullptr), counter(1) { }
     virtual ~QOutputStrategy() {}
     virtual void addFile(const QString &fileName, const QString &mimeType, const QByteArray &bytes) = 0;
 
@@ -240,7 +240,7 @@ void QTextOdfWriter::writeFrame(QXmlStreamWriter &writer, const QTextFrame *fram
     }
 
     QTextFrame::iterator iterator = frame->begin();
-    QTextFrame *child = 0;
+    QTextFrame *child = nullptr;
 
     int tableRow = -1;
     while (! iterator.atEnd()) {
@@ -437,7 +437,7 @@ static bool probeImageData(QIODevice *device, QImage *image, QString *mimeType,
 void QTextOdfWriter::writeInlineCharacter(QXmlStreamWriter &writer, const QTextFragment &fragment) const
 {
     writer.writeStartElement(drawNS, QString::fromLatin1("frame"));
-    if (m_strategy == 0) {
+    if (m_strategy == nullptr) {
         // don't do anything.
     }
     else if (fragment.charFormat().isImageFormat()) {
@@ -997,8 +997,8 @@ QTextOdfWriter::QTextOdfWriter(const QTextDocument &document, QIODevice *device)
     svgNS (QLatin1String("urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0")),
     m_document(&document),
     m_device(device),
-    m_strategy(0),
-    m_codec(0),
+    m_strategy(nullptr),
+    m_codec(nullptr),
     m_createArchive(true)
 {
 }
@@ -1093,7 +1093,7 @@ bool QTextOdfWriter::writeAll()
     writer.writeEndElement(); // document-content
     writer.writeEndDocument();
     delete m_strategy;
-    m_strategy = 0;
+    m_strategy = nullptr;
 
     return true;
 }
diff --git a/src/gui/text/qtextoption.cpp b/src/gui/text/qtextoption.cpp
index 2c2c05567f..2f195599f0 100644
--- a/src/gui/text/qtextoption.cpp
+++ b/src/gui/text/qtextoption.cpp
@@ -62,7 +62,7 @@ QTextOption::QTextOption()
       unused2(0),
       f(0),
       tab(-1),
-      d(0)
+      d(nullptr)
 {
     direction = Qt::LayoutDirectionAuto;
 }
@@ -80,7 +80,7 @@ QTextOption::QTextOption(Qt::Alignment alignment)
       unused2(0),
       f(0),
       tab(-1),
-      d(0)
+      d(nullptr)
 {
     direction = QGuiApplication::layoutDirection();
 }
@@ -107,7 +107,7 @@ QTextOption::QTextOption(const QTextOption &o)
       unused2(o.unused2),
       f(o.f),
       tab(o.tab),
-      d(0)
+      d(nullptr)
 {
     if (o.d)
         d = new QTextOptionPrivate(*o.d);
@@ -124,7 +124,7 @@ QTextOption &QTextOption::operator=(const QTextOption &o)
     if (this == &o)
         return *this;
 
-    QTextOptionPrivate* dNew = 0;
+    QTextOptionPrivate* dNew = nullptr;
     if (o.d)
         dNew = new QTextOptionPrivate(*o.d);
     delete d;
diff --git a/src/gui/text/qzip.cpp b/src/gui/text/qzip.cpp
index fc7fbcac12..80c0f122e8 100644
--- a/src/gui/text/qzip.cpp
+++ b/src/gui/text/qzip.cpp
@@ -141,8 +141,8 @@ static int inflate(Bytef *dest, ulong *destLen, const Bytef *source, ulong sourc
     if ((uLong)stream.avail_out != *destLen)
         return Z_BUF_ERROR;
 
-    stream.zalloc = (alloc_func)0;
-    stream.zfree = (free_func)0;
+    stream.zalloc = (alloc_func)nullptr;
+    stream.zfree = (free_func)nullptr;
 
     err = inflateInit2(&stream, -MAX_WBITS);
     if (err != Z_OK)
@@ -172,9 +172,9 @@ static int deflate (Bytef *dest, ulong *destLen, const Bytef *source, ulong sour
     stream.avail_out = (uInt)*destLen;
     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 
-    stream.zalloc = (alloc_func)0;
-    stream.zfree = (free_func)0;
-    stream.opaque = (voidpf)0;
+    stream.zalloc = (alloc_func)nullptr;
+    stream.zfree = (free_func)nullptr;
+    stream.opaque = (voidpf)nullptr;
 
     err = deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, 8, Z_DEFAULT_STRATEGY);
     if (err != Z_OK) return err;
@@ -705,7 +705,7 @@ void QZipWriterPrivate::addEntry(EntryType type, const QString &fileName, const
     }
 // TODO add a check if data.length() > contents.length().  Then try to store the original and revert the compression method to be uncompressed
     writeUInt(header.h.compressed_size, data.length());
-    uint crc_32 = ::crc32(0, 0, 0);
+    uint crc_32 = ::crc32(0, nullptr, 0);
     crc_32 = ::crc32(crc_32, (const uchar *)contents.constData(), contents.length());
     writeUInt(header.h.crc_32, crc_32);
 
@@ -886,7 +886,7 @@ bool QZipReader::isReadable() const
 bool QZipReader::exists() const
 {
     QFile *f = qobject_cast<QFile*> (d->device);
-    if (f == 0)
+    if (f == nullptr)
         return true;
     return f->exists();
 }
@@ -1178,7 +1178,7 @@ bool QZipWriter::isWritable() const
 bool QZipWriter::exists() const
 {
     QFile *f = qobject_cast<QFile*> (d->device);
-    if (f == 0)
+    if (f == nullptr)
         return true;
     return f->exists();
 }
diff --git a/src/gui/util/qdesktopservices.cpp b/src/gui/util/qdesktopservices.cpp
index 99214c4960..763f309fc7 100644
--- a/src/gui/util/qdesktopservices.cpp
+++ b/src/gui/util/qdesktopservices.cpp
@@ -287,7 +287,7 @@ void QDesktopServices::setUrlHandler(const QString &scheme, QObject *receiver, c
 */
 void QDesktopServices::unsetUrlHandler(const QString &scheme)
 {
-    setUrlHandler(scheme, 0, 0);
+    setUrlHandler(scheme, nullptr, nullptr);
 }
 
 #if QT_DEPRECATED_SINCE(5, 0)
diff --git a/src/gui/util/qgridlayoutengine.cpp b/src/gui/util/qgridlayoutengine.cpp
index 024f0f084e..4af5e47f8f 100644
--- a/src/gui/util/qgridlayoutengine.cpp
+++ b/src/gui/util/qgridlayoutengine.cpp
@@ -177,7 +177,7 @@ void QGridLayoutRowData::distributeMultiCells(const QGridLayoutRowInfo &rowInfo,
             qreal extra = compare(box, totalBox, j);
             if (extra > 0.0) {
                 calculateGeometries(start, end, box.q_sizes(j), dummy.data(), newSizes.data(),
-                                    0, totalBox, rowInfo, snapToPixelGrid);
+                                    nullptr, totalBox, rowInfo, snapToPixelGrid);
 
                 for (int k = 0; k < span; ++k)
                     extras[k].q_sizes(j) = newSizes[k];
@@ -988,7 +988,7 @@ void QGridLayoutEngine::removeItem(QGridLayoutItem *item)
     for (int i = item->firstRow(); i <= item->lastRow(); ++i) {
         for (int j = item->firstColumn(); j <= item->lastColumn(); ++j) {
             if (itemAt(i, j) == item)
-                setItemAt(i, j, 0);
+                setItemAt(i, j, nullptr);
         }
     }
 
@@ -1001,7 +1001,7 @@ QGridLayoutItem *QGridLayoutEngine::itemAt(int row, int column, Qt::Orientation
     if (orientation == Qt::Horizontal)
         qSwap(row, column);
     if (uint(row) >= uint(rowCount()) || uint(column) >= uint(columnCount()))
-        return 0;
+        return nullptr;
     return q_grid.at((row * internalGridColumnCount()) + column);
 }
 
@@ -1100,7 +1100,7 @@ QSizeF QGridLayoutEngine::sizeHint(Qt::SizeHint which, const QSizeF &constraint,
         if (constraintOrientation() == Qt::Vertical) {
             //We have items whose height depends on their width
             if (constraint.width() >= 0) {
-                ensureColumnAndRowData(&q_columnData, &sizehint_totalBoxes[Hor], NULL, NULL, Qt::Horizontal, styleInfo);
+                ensureColumnAndRowData(&q_columnData, &sizehint_totalBoxes[Hor], nullptr, nullptr, Qt::Horizontal, styleInfo);
                 QVector<qreal> sizehint_xx;
                 QVector<qreal> sizehint_widths;
 
@@ -1110,14 +1110,14 @@ QSizeF QGridLayoutEngine::sizeHint(Qt::SizeHint which, const QSizeF &constraint,
                 //Calculate column widths and positions, and put results in q_xx.data() and q_widths.data() so that we can use this information as
                 //constraints to find the row heights
                 q_columnData.calculateGeometries(0, columnCount(), width, sizehint_xx.data(), sizehint_widths.data(),
-                        0, sizehint_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
+                        nullptr, sizehint_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
                 ensureColumnAndRowData(&q_rowData, &sizehint_totalBoxes[Ver], sizehint_xx.data(), sizehint_widths.data(), Qt::Vertical, styleInfo);
                 sizeHintCalculated = true;
             }
         } else {
             if (constraint.height() >= 0) {
                 //We have items whose width depends on their height
-                ensureColumnAndRowData(&q_rowData, &sizehint_totalBoxes[Ver], NULL, NULL, Qt::Vertical, styleInfo);
+                ensureColumnAndRowData(&q_rowData, &sizehint_totalBoxes[Ver], nullptr, nullptr, Qt::Vertical, styleInfo);
                 QVector<qreal> sizehint_yy;
                 QVector<qreal> sizehint_heights;
 
@@ -1127,7 +1127,7 @@ QSizeF QGridLayoutEngine::sizeHint(Qt::SizeHint which, const QSizeF &constraint,
                 //Calculate row heights and positions, and put results in q_yy.data() and q_heights.data() so that we can use this information as
                 //constraints to find the column widths
                 q_rowData.calculateGeometries(0, rowCount(), height, sizehint_yy.data(), sizehint_heights.data(),
-                        0, sizehint_totalBoxes[Ver], q_infos[Ver], m_snapToPixelGrid);
+                        nullptr, sizehint_totalBoxes[Ver], q_infos[Ver], m_snapToPixelGrid);
                 ensureColumnAndRowData(&q_columnData, &sizehint_totalBoxes[Hor], sizehint_yy.data(), sizehint_heights.data(), Qt::Horizontal, styleInfo);
                 sizeHintCalculated = true;
             }
@@ -1137,8 +1137,8 @@ QSizeF QGridLayoutEngine::sizeHint(Qt::SizeHint which, const QSizeF &constraint,
     }
 
     //No items with height for width, so it doesn't matter which order we do these in
-    ensureColumnAndRowData(&q_columnData, &q_totalBoxes[Hor], NULL, NULL, Qt::Horizontal, styleInfo);
-    ensureColumnAndRowData(&q_rowData, &q_totalBoxes[Ver], NULL, NULL, Qt::Vertical, styleInfo);
+    ensureColumnAndRowData(&q_columnData, &q_totalBoxes[Hor], nullptr, nullptr, Qt::Horizontal, styleInfo);
+    ensureColumnAndRowData(&q_rowData, &q_totalBoxes[Ver], nullptr, nullptr, Qt::Vertical, styleInfo);
     return QSizeF(q_totalBoxes[Hor].q_sizes(which), q_totalBoxes[Ver].q_sizes(which));
 }
 
@@ -1650,18 +1650,18 @@ void QGridLayoutEngine::ensureGeometries(const QSizeF &size,
 
     if (constraintOrientation() != Qt::Horizontal) {
         //We might have items whose height depends on their width (HFW)
-        ensureColumnAndRowData(&q_columnData, &q_totalBoxes[Hor], NULL, NULL, Qt::Horizontal, styleInfo);
+        ensureColumnAndRowData(&q_columnData, &q_totalBoxes[Hor], nullptr, nullptr, Qt::Horizontal, styleInfo);
         //Calculate column widths and positions, and put results in q_xx.data() and q_widths.data() so that we can use this information as
         //constraints to find the row heights
         q_columnData.calculateGeometries(0, columnCount(), size.width(), q_xx.data(), q_widths.data(),
-                0, q_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
+                nullptr, q_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
         ensureColumnAndRowData(&q_rowData, &q_totalBoxes[Ver], q_xx.data(), q_widths.data(), Qt::Vertical, styleInfo);
         //Calculate row heights and positions, and put results in q_yy.data() and q_heights.data()
         q_rowData.calculateGeometries(0, rowCount(), size.height(), q_yy.data(), q_heights.data(),
                 q_descents.data(), q_totalBoxes[Ver], q_infos[Ver], m_snapToPixelGrid);
     } else {
         //We have items whose width depends on their height (WFH)
-        ensureColumnAndRowData(&q_rowData, &q_totalBoxes[Ver], NULL, NULL, Qt::Vertical, styleInfo);
+        ensureColumnAndRowData(&q_rowData, &q_totalBoxes[Ver], nullptr, nullptr, Qt::Vertical, styleInfo);
         //Calculate row heights and positions, and put results in q_yy.data() and q_heights.data() so that we can use this information as
         //constraints to find the column widths
         q_rowData.calculateGeometries(0, rowCount(), size.height(), q_yy.data(), q_heights.data(),
@@ -1669,7 +1669,7 @@ void QGridLayoutEngine::ensureGeometries(const QSizeF &size,
         ensureColumnAndRowData(&q_columnData, &q_totalBoxes[Hor], q_yy.data(), q_heights.data(), Qt::Horizontal, styleInfo);
         //Calculate row heights and positions, and put results in q_yy.data() and q_heights.data()
         q_columnData.calculateGeometries(0, columnCount(), size.width(), q_xx.data(), q_widths.data(),
-                0, q_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
+                nullptr, q_totalBoxes[Hor], q_infos[Hor], m_snapToPixelGrid);
     }
 }
 
diff --git a/src/gui/util/qtexturefiledata.cpp b/src/gui/util/qtexturefiledata.cpp
index ebf46f8e4e..41cbd1b15a 100644
--- a/src/gui/util/qtexturefiledata.cpp
+++ b/src/gui/util/qtexturefiledata.cpp
@@ -247,7 +247,7 @@ void QTextureFileData::setLogName(const QByteArray &name)
 
 static QByteArray glFormatName(quint32 fmt)
 {
-    const char *id = 0;
+    const char *id = nullptr;
 #if QT_CONFIG(opengl)
     id = QMetaEnum::fromType<QOpenGLTexture::TextureFormat>().valueToKey(fmt);
 #endif
diff --git a/src/gui/vulkan/qvulkaninstance.cpp b/src/gui/vulkan/qvulkaninstance.cpp
index 764cb917ad..4b961a6f20 100644
--- a/src/gui/vulkan/qvulkaninstance.cpp
+++ b/src/gui/vulkan/qvulkaninstance.cpp
@@ -758,7 +758,7 @@ VkSurfaceKHR QVulkanInstance::surfaceForWindow(QWindow *window)
     // VkSurfaceKHR is non-dispatchable and maps to a pointer on x64 and a uint64 on x86.
     // Therefore a pointer is returned from the platform plugin, not the value itself.
     void *p = nativeInterface->nativeResourceForWindow(QByteArrayLiteral("vkSurface"), window);
-    return p ? *static_cast<VkSurfaceKHR *>(p) : 0;
+    return p ? *static_cast<VkSurfaceKHR *>(p) : VK_NULL_HANDLE;
 }
 
 /*!
diff --git a/src/gui/vulkan/qvulkanwindow.cpp b/src/gui/vulkan/qvulkanwindow.cpp
index 790bef9e14..ed73a77683 100644
--- a/src/gui/vulkan/qvulkanwindow.cpp
+++ b/src/gui/vulkan/qvulkanwindow.cpp
@@ -1866,7 +1866,7 @@ void QVulkanWindowPrivate::beginFrame()
     // build new draw command buffer
     if (image.cmdBuf) {
         devFuncs->vkFreeCommandBuffers(dev, cmdPool, 1, &image.cmdBuf);
-        image.cmdBuf = 0;
+        image.cmdBuf = nullptr;
     }
 
     VkCommandBufferAllocateInfo cmdBufInfo = {