QtGui: de-duplicate calls and cache results

Change-Id: Iaf232c31d6780b49dc6a3d0faafb9717f3c36e65
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/gui/kernel/qrasterwindow.cpp b/src/gui/kernel/qrasterwindow.cpp
index 947f2bb6a8..d8d448249e 100644
--- a/src/gui/kernel/qrasterwindow.cpp
+++ b/src/gui/kernel/qrasterwindow.cpp
@@ -73,8 +73,9 @@ public:
     void beginPaint(const QRegion &region) Q_DECL_OVERRIDE
     {
         Q_Q(QRasterWindow);
-        if (backingstore->size() != q->size()) {
-            backingstore->resize(q->size());
+        const QSize size = q->size();
+        if (backingstore->size() != size) {
+            backingstore->resize(size);
             markWindowAsDirty();
         }
         backingstore->beginPaint(region);