Make threaded rendering possible with LinuxFB

It was previously not possible to render to a QBackingStore
with the linuxfb platform plugin because of both the use of
a QTimer created on the main thread and there was no lock
on the backing store surface (which would lead to copy content
to screen that being rendered in another thread).

Change-Id: I0ea3600316ce29eb89f6595997847afe7086116f
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/platformsupport/fbconvenience/qfbbackingstore_p.h b/src/platformsupport/fbconvenience/qfbbackingstore_p.h
index 08a4b37eee..a9917e1450 100644
--- a/src/platformsupport/fbconvenience/qfbbackingstore_p.h
+++ b/src/platformsupport/fbconvenience/qfbbackingstore_p.h
@@ -46,6 +46,7 @@
 //
 
 #include <qpa/qplatformbackingstore.h>
+#include <QtCore/QMutex>
 
 QT_BEGIN_NAMESPACE
 
@@ -64,12 +65,19 @@ public:
 
     virtual void resize(const QSize &size, const QRegion &region);
 
-    const QImage image() { return mImage; }
+    const QImage image();
+
+    void lock();
+    void unlock();
+
+    void beginPaint(const QRegion &);
+    void endPaint();
 
 protected:
     friend class QFbWindow;
 
     QImage mImage;
+    QMutex mImageMutex;
 };
 
 QT_END_NAMESPACE