4 files changed, 59 insertions, 0 deletions

diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index 35a9559..3605472 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -3426,7 +3426,35 @@ QString QApplication::sessionKey() const
 }
 #endif
 
+/*!
+    \since 4.7.4
+    \fn void QApplication::aboutToReleaseGpuResources()
+
+    This signal is emitted when application is about to release all
+    GPU resources associated to contexts owned by application.
+
+    The signal is particularly useful if your application has allocated
+    GPU resources directly apart from Qt and needs to do some last-second
+    cleanup.
+
+    \warning This signal is only emitted on Symbian.
+
+    \sa aboutToUseGpuResources()
+*/
 
+/*!
+    \since 4.7.4
+    \fn void QApplication::aboutToUseGpuResources()
+
+    This signal is emitted when application is about to use GPU resources.
+
+    The signal is particularly useful if your application needs to know
+    when GPU resources are be available.
+
+   \warning This signal is only emitted on Symbian.
+
+   \sa aboutToFreeGpuResources()
+*/
 
 /*!
     \since 4.2
diff --git a/src/gui/kernel/qapplication.h b/src/gui/kernel/qapplication.h
index 1548849..3334056 100644
--- a/src/gui/kernel/qapplication.h
+++ b/src/gui/kernel/qapplication.h
@@ -305,6 +305,10 @@ Q_SIGNALS:
     void commitDataRequest(QSessionManager &sessionManager);
     void saveStateRequest(QSessionManager &sessionManager);
 #endif
+#ifdef Q_OS_SYMBIAN
+    void aboutToReleaseGpuResources();
+    void aboutToUseGpuResources();
+#endif
 
 public:
     QString styleSheet() const;
diff --git a/src/gui/kernel/qapplication_p.h b/src/gui/kernel/qapplication_p.h
index 0756d6c..c4cb19c 100644
--- a/src/gui/kernel/qapplication_p.h
+++ b/src/gui/kernel/qapplication_p.h
@@ -564,6 +564,9 @@ public:
     void symbianHandleLiteModeStartup();
 
     void _q_aboutToQuit();
+
+    void emitAboutToReleaseGpuResources();
+    void emitAboutToUseGpuResources();
 #endif
 #if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined (Q_WS_QWS) || defined(Q_WS_MAC) || defined(Q_WS_QPA)
     void sendSyntheticEnterLeave(QWidget *widget);
diff --git a/src/gui/kernel/qapplication_s60.cpp b/src/gui/kernel/qapplication_s60.cpp
index 7d198ce..954d7fb 100644
--- a/src/gui/kernel/qapplication_s60.cpp
+++ b/src/gui/kernel/qapplication_s60.cpp
@@ -235,6 +235,9 @@ void QS60Data::controlVisibilityChanged(CCoeControl *control, bool visible)
         if (QTLWExtra *topData = qt_widget_private(window)->maybeTopData()) {
             QWidgetBackingStoreTracker &backingStore = topData->backingStore;
             if (visible) {
+                QApplicationPrivate *d = QApplicationPrivate::instance();
+                d->emitAboutToUseGpuResources();
+
                 if (backingStore.data()) {
                     backingStore.registerWidget(widget);
                 } else {
@@ -244,6 +247,9 @@ void QS60Data::controlVisibilityChanged(CCoeControl *control, bool visible)
                     widget->repaint();
                 }
             } else {
+                QApplicationPrivate *d = QApplicationPrivate::instance();
+                d->emitAboutToReleaseGpuResources();
+
                 // In certain special scenarios we may get an ENotVisible event
                 // without a previous EPartiallyVisible. The backingstore must
                 // still be destroyed, hence the registerWidget() call below.
@@ -2795,6 +2801,24 @@ void QApplicationPrivate::_q_aboutToQuit()
 #endif
 }
 
+void QApplicationPrivate::emitAboutToReleaseGpuResources()
+{
+#ifdef Q_SYMBIAN_SUPPORTS_SURFACES
+    Q_Q(QApplication);
+    QPointer<QApplication> guard(q);
+    emit q->aboutToReleaseGpuResources();
+#endif
+}
+
+void QApplicationPrivate::emitAboutToUseGpuResources()
+{
+#ifdef Q_SYMBIAN_SUPPORTS_SURFACES
+    Q_Q(QApplication);
+    QPointer<QApplication> guard(q);
+    emit q->aboutToUseGpuResources();
+#endif
+}
+
 QS60ThreadLocalData::QS60ThreadLocalData()
 {
     CCoeEnv *env = CCoeEnv::Static();