Use QVector::reserve() all over the place.

Reduces internal memory fragmentation.

The search criteria was:
QVector::append(), QVector::push_back(), QVector::operator<<()
and QVector::operator+=() calls inside for, do and while loops.
Statements inside ifs and out of loops weren't considered.

Change-Id: Ie5aaf3cdfac938994e6e5dfa5f51de501ed79a0c
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/painting/qplatformbackingstore.cpp b/src/gui/painting/qplatformbackingstore.cpp
index 62492980de..c1737e7746 100644
--- a/src/gui/painting/qplatformbackingstore.cpp
+++ b/src/gui/painting/qplatformbackingstore.cpp
@@ -220,7 +220,9 @@ static QRegion deviceRegion(const QRegion &region, QWindow *window)
         return region;
 
     QVector<QRect> rects;
-    foreach (QRect rect, region.rects())
+    const QVector<QRect> regionRects = region.rects();
+    rects.reserve(regionRects.count());
+    foreach (const QRect &rect, regionRects)
         rects.append(deviceRect(rect, window));
 
     QRegion deviceRegion;