qpa: improve DirectFB performance

QDirectFbWindowSurface::resize() must call parent
QWindowSurface::resize() method in order to update QWindowSurfacePrivate
size.

Change-Id: Icd605dc1923f2560579ccb2e4f800c80ff7e92fd
Reviewed-by: Holger Freyther <holger+qt@freyther.de>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/plugins/platforms/directfb/qdirectfbwindowsurface.cpp b/src/plugins/platforms/directfb/qdirectfbwindowsurface.cpp
index 5d03c26..236fdb2 100644
--- a/src/plugins/platforms/directfb/qdirectfbwindowsurface.cpp
+++ b/src/plugins/platforms/directfb/qdirectfbwindowsurface.cpp
@@ -83,6 +83,10 @@ void QDirectFbWindowSurface::flush(QWidget *widget, const QRegion &region, const
 
 void QDirectFbWindowSurface::resize(const QSize &size)
 {
+    if (size == QWindowSurface::size())
+        return;
+
+    QWindowSurface::resize(size);
     QDirectFbBlitter *blitter = new QDirectFbBlitter(size, m_dfbSurface.data());
     m_pmdata->setBlittable(blitter);
 }