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>

2 files changed, 4 insertions, 1 deletions

diff --git a/src/plugins/platforms/xcb/qxcbdrag.cpp b/src/plugins/platforms/xcb/qxcbdrag.cpp
index 1d13adf851..35c6614d4c 100644
--- a/src/plugins/platforms/xcb/qxcbdrag.cpp
+++ b/src/plugins/platforms/xcb/qxcbdrag.cpp
@@ -689,6 +689,7 @@ void QXcbDrag::handleEnter(QWindow *window, const xcb_client_message_event_t *ev
                 length = xdnd_max_type;
 
             xcb_atom_t *atoms = (xcb_atom_t *)xcb_get_property_value(reply);
+            xdnd_types.reserve(length);
             for (int i = 0; i < length; ++i)
                 xdnd_types.append(atoms[i]);
         }
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index d2da137591..daee44fa96 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -2688,7 +2688,9 @@ void QXcbWindow::setMask(const QRegion &region)
     } else {
         const int dpr = devicePixelRatio();
         QVector<xcb_rectangle_t> rects;
-        foreach (const QRect &r, region.rects())
+        const QVector<QRect> regionRects = region.rects();
+        rects.reserve(regionRects.count());
+        foreach (const QRect &r, regionRects)
             rects.push_back(qRectToXCBRectangle(mapLocalGeometryToNative(r, dpr)));
         xcb_shape_rectangles(connection()->xcb_connection(), XCB_SHAPE_SO_SET,
                              XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED,