qpa: avoid useless resize in DirectFB platform

Check current size before resizing QDirectFbBackingStore through
its resize() method to avoid useless deallocation/reallocation.

Change-Id: Idc32eb20d3d3cac988fa9dd2feb80910303f5763
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/plugins/platforms/directfb/qdirectfbbackingstore.cpp b/src/plugins/platforms/directfb/qdirectfbbackingstore.cpp
index 95e3609172..203cd8cc45 100644
--- a/src/plugins/platforms/directfb/qdirectfbbackingstore.cpp
+++ b/src/plugins/platforms/directfb/qdirectfbbackingstore.cpp
@@ -82,6 +82,12 @@ void QDirectFbBackingStore::flush(QWindow *, const QRegion &region, const QPoint
 
 void QDirectFbBackingStore::resize(const QSize &size, const QRegion& reg)
 {
+    Q_UNUSED(reg);
+
+    if ((m_pmdata->width() == size.width()) &&
+        (m_pmdata->height() == size.height()))
+        return;
+
     QDirectFbBlitter *blitter = new QDirectFbBlitter(size, m_dfbSurface.data());
     m_pmdata->setBlittable(blitter);
 }