From 01859cc12126b7205f5b54d383a9aa88db756f21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9rgio=20Martins?= <sergio.martins@kdab.com>
Date: Sat, 16 Jan 2016 00:24:54 +0000
Subject: Reduce allocations by using reserve()

Change-Id: If34fa53402985f6b3c5e7217bce4a1177af835b6
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
---
 src/widgets/kernel/qwidgetbackingstore.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/widgets/kernel/qwidgetbackingstore.cpp')

diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index d9d1c887c1..5e6563b0be 100644
--- a/src/widgets/kernel/qwidgetbackingstore.cpp
+++ b/src/widgets/kernel/qwidgetbackingstore.cpp
@@ -1242,13 +1242,15 @@ void QWidgetBackingStore::doSync()
         // OpenGL content changes. Check if we have such widgets in the special
         // dirty list.
         QVarLengthArray<QWidget *, 16> paintPending;
-        for (int i = 0; i < dirtyRenderToTextureWidgets.count(); ++i) {
+        const int numPaintPending = dirtyRenderToTextureWidgets.count();
+        paintPending.reserve(numPaintPending);
+        for (int i = 0; i < numPaintPending; ++i) {
             QWidget *w = dirtyRenderToTextureWidgets.at(i);
             paintPending << w;
             resetWidget(w);
         }
         dirtyRenderToTextureWidgets.clear();
-        for (int i = 0; i < paintPending.count(); ++i) {
+        for (int i = 0; i < numPaintPending; ++i) {
             QWidget *w = paintPending[i];
             w->d_func()->sendPaintEvent(w->rect());
             if (w != tlw) {
-- 
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