QtGui: replace some QMutexLockers with (new) qt_{scoped,unique}_lock()

In QImageReader, also replace a QMutex with a QBasicMutex, making the
code similar to the corresponding code in QPicture.

Change-Id: Ia1cd546eccd3662837762e506235e350b7a08647
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/gui/image/qimagereader.cpp

@@ -150,7 +150,7 @@
 // factory loader
 #include <qcoreapplication.h>
 #include <private/qfactoryloader_p.h>
-#include <QMutexLocker>
+#include <QtCore/private/qlocking_p.h>
 
 // for qt_getImageText
 #include <private/qimage_p.h>
@@ -186,8 +186,8 @@ static QImageIOHandler *createReadHandlerHelper(QIODevice *device,
     QByteArray suffix;
 
 #ifndef QT_NO_IMAGEFORMATPLUGIN
-    static QMutex mutex;
-    QMutexLocker locker(&mutex);
+    static QBasicMutex mutex;
+    const auto locker = qt_scoped_lock(mutex);
 
     typedef QMultiMap<int, QString> PluginKeyMap;
 

src/gui/image/qpicture.cpp

@@ -57,6 +57,7 @@
 #include "qregexp.h"
 #include "qregion.h"
 #include "qdebug.h"
+#include <QtCore/private/qlocking_p.h>
 
 #include <algorithm>
 
@@ -1427,7 +1428,7 @@ void qt_init_picture_plugins()
     typedef PluginKeyMap::const_iterator PluginKeyMapConstIterator;
 
     static QBasicMutex mutex;
-    QMutexLocker locker(&mutex);
+    const auto locker = qt_scoped_lock(mutex);
     static QFactoryLoader loader(QPictureFormatInterface_iid,
                                  QStringLiteral("/pictureformats"));
 

src/gui/kernel/qguiapplication.cpp

@@ -58,6 +58,7 @@
 #include <QtCore/private/qabstracteventdispatcher_p.h>
 #include <QtCore/qmutex.h>
 #include <QtCore/private/qthread_p.h>
+#include <QtCore/private/qlocking_p.h>
 #include <QtCore/qdir.h>
 #include <QtCore/qlibraryinfo.h>
 #include <QtCore/qnumeric.h>
@@ -3305,7 +3306,7 @@ void QGuiApplicationPrivate::applyWindowGeometrySpecificationTo(QWindow *window)
 QFont QGuiApplication::font()
 {
     Q_ASSERT_X(QGuiApplicationPrivate::self, "QGuiApplication::font()", "no QGuiApplication instance");
-    QMutexLocker locker(&applicationFontMutex);
+    const auto locker = qt_scoped_lock(applicationFontMutex);
     initFontUnlocked();
     return *QGuiApplicationPrivate::app_font;
 }
@@ -3317,7 +3318,7 @@ QFont QGuiApplication::font()
 */
 void QGuiApplication::setFont(const QFont &font)
 {
-    QMutexLocker locker(&applicationFontMutex);
+    auto locker = qt_unique_lock(applicationFontMutex);
     const bool emitChange = !QGuiApplicationPrivate::app_font
                             || (*QGuiApplicationPrivate::app_font != font);
     if (!QGuiApplicationPrivate::app_font)
@@ -4081,7 +4082,7 @@ void QGuiApplicationPrivate::notifyThemeChanged()
             sendApplicationPaletteChange();
     }
     if (!(applicationResourceFlags & ApplicationFontExplicitlySet)) {
-        QMutexLocker locker(&applicationFontMutex);
+        const auto locker = qt_scoped_lock(applicationFontMutex);
         clearFontUnlocked();
         initFontUnlocked();
     }

src/gui/kernel/qopenglcontext.cpp

@@ -45,6 +45,7 @@
 
 #include <QtCore/QThreadStorage>
 #include <QtCore/QThread>
+#include <QtCore/private/qlocking_p.h>
 
 #include <QtGui/private/qguiapplication_p.h>
 #include <QtGui/private/qopengl_p.h>
@@ -1442,7 +1443,7 @@ QOpenGLContextGroup *QOpenGLContextGroup::currentContextGroup()
 
 void QOpenGLContextGroupPrivate::addContext(QOpenGLContext *ctx)
 {
-    QMutexLocker locker(&m_mutex);
+    const auto locker = qt_scoped_lock(m_mutex);
     m_refs.ref();
     m_shares << ctx;
 }
@@ -1454,7 +1455,7 @@ void QOpenGLContextGroupPrivate::removeContext(QOpenGLContext *ctx)
     bool deleteObject = false;
 
     {
-        QMutexLocker locker(&m_mutex);
+        const auto locker = qt_scoped_lock(m_mutex);
         m_shares.removeOne(ctx);
 
         if (ctx == m_context && !m_shares.isEmpty())
@@ -1502,7 +1503,7 @@ void QOpenGLContextGroupPrivate::cleanup()
 
 void QOpenGLContextGroupPrivate::deletePendingResources(QOpenGLContext *ctx)
 {
-    QMutexLocker locker(&m_mutex);
+    const auto locker = qt_scoped_lock(m_mutex);
 
     const QList<QOpenGLSharedResource *> pending = m_pendingDeletion;
     m_pendingDeletion.clear();
@@ -1543,7 +1544,7 @@ void QOpenGLContextGroupPrivate::deletePendingResources(QOpenGLContext *ctx)
 QOpenGLSharedResource::QOpenGLSharedResource(QOpenGLContextGroup *group)
     : m_group(group)
 {
-    QMutexLocker locker(&m_group->d_func()->m_mutex);
+    const auto locker = qt_scoped_lock(m_group->d_func()->m_mutex);
     m_group->d_func()->m_sharedResources << this;
 }
 
@@ -1559,7 +1560,7 @@ void QOpenGLSharedResource::free()
         return;
     }
 
-    QMutexLocker locker(&m_group->d_func()->m_mutex);
+    const auto locker = qt_scoped_lock(m_group->d_func()->m_mutex);
     m_group->d_func()->m_sharedResources.removeOne(this);
     m_group->d_func()->m_pendingDeletion << this;
 

src/gui/kernel/qtouchdevice.cpp

@@ -228,7 +228,7 @@ TouchDevices::TouchDevices()
   */
 QList<const QTouchDevice *> QTouchDevice::devices()
 {
-    QMutexLocker lock(&devicesMutex);
+    const auto locker = qt_scoped_lock(devicesMutex);
     return deviceList->list;
 }
 
@@ -237,13 +237,13 @@ QList<const QTouchDevice *> QTouchDevice::devices()
   */
 bool QTouchDevicePrivate::isRegistered(const QTouchDevice *dev)
 {
-    QMutexLocker locker(&devicesMutex);
+    const auto locker = qt_scoped_lock(devicesMutex);
     return deviceList->list.contains(dev);
 }
 
 const QTouchDevice *QTouchDevicePrivate::deviceById(quint8 id)
 {
-    QMutexLocker locker(&devicesMutex);
+    const auto locker = qt_scoped_lock(devicesMutex);
     for (const QTouchDevice *dev : qAsConst(deviceList->list))
         if (QTouchDevicePrivate::get(const_cast<QTouchDevice *>(dev))->id == id)
             return dev;
@@ -255,7 +255,7 @@ const QTouchDevice *QTouchDevicePrivate::deviceById(quint8 id)
   */
 void QTouchDevicePrivate::registerDevice(const QTouchDevice *dev)
 {
-    QMutexLocker lock(&devicesMutex);
+    const auto locker = qt_scoped_lock(devicesMutex);
     deviceList->list.append(dev);
 }
 
@@ -264,7 +264,7 @@ void QTouchDevicePrivate::registerDevice(const QTouchDevice *dev)
   */
 void QTouchDevicePrivate::unregisterDevice(const QTouchDevice *dev)
 {
-    QMutexLocker lock(&devicesMutex);
+    const auto locker = qt_scoped_lock(devicesMutex);
     deviceList->list.removeOne(dev);
 }