Android: Fix crash when using QBackingStore

When making a QBackingStore for a QWindow that was not created yet,
Qt would try to dereference the (null) platform window pointer.

Task-number: QTBUG-31022
Change-Id: I866c71cce9d401ebb598ea4cc91f7cf9bbb30982
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/platformsupport/fbconvenience/qfbscreen_p.h b/src/platformsupport/fbconvenience/qfbscreen_p.h
index c7106358d9..01a352e96a 100644
--- a/src/platformsupport/fbconvenience/qfbscreen_p.h
+++ b/src/platformsupport/fbconvenience/qfbscreen_p.h
@@ -51,6 +51,7 @@ QT_BEGIN_NAMESPACE
 class QFbWindow;
 class QFbCursor;
 class QPainter;
+class QFbBackingStore;
 
 class QFbScreen : public QObject, public QPlatformScreen
 {
@@ -74,6 +75,8 @@ public:
     virtual void lower(QFbWindow *window);
     virtual void topWindowChanged(QWindow *) {}
 
+    void addBackingStore(QFbBackingStore *bs) {mBackingStores << bs;}
+
 public slots:
     virtual void setDirty(const QRect &rect);
     void setPhysicalSize(const QSize &size);
@@ -102,6 +105,7 @@ private:
 
     QPainter *mCompositePainter;
     QList<QPair<QRect, int> > mCachedRects;
+    QList <QFbBackingStore*> mBackingStores;
 
     friend class QFbWindow;
     bool mIsUpToDate;