gui: Add several QList::reserve() calls.

Reduces reallocations.

Change-Id: I0db16726f413a67b76a73fabd013f910ab5f5109
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/gui/kernel/qdnd.cpp b/src/gui/kernel/qdnd.cpp
index 3ce8ab95ec..b05da1bfd0 100644
--- a/src/gui/kernel/qdnd.cpp
+++ b/src/gui/kernel/qdnd.cpp
@@ -147,7 +147,9 @@ static QStringList imageReadMimeFormats()
 {
     QStringList formats;
     QList<QByteArray> imageFormats = QImageReader::supportedImageFormats();
-    for (int i = 0; i < imageFormats.size(); ++i) {
+    const int numImageFormats = imageFormats.size();
+    formats.reserve(numImageFormats);
+    for (int i = 0; i < numImageFormats; ++i) {
         QString format = QLatin1String("image/");
         format += QString::fromLatin1(imageFormats.at(i).toLower());
         formats.append(format);
@@ -166,7 +168,9 @@ static QStringList imageWriteMimeFormats()
 {
     QStringList formats;
     QList<QByteArray> imageFormats = QImageWriter::supportedImageFormats();
-    for (int i = 0; i < imageFormats.size(); ++i) {
+    const int numImageFormats = imageFormats.size();
+    formats.reserve(numImageFormats);
+    for (int i = 0; i < numImageFormats; ++i) {
         QString format = QLatin1String("image/");
         format += QString::fromLatin1(imageFormats.at(i).toLower());
         formats.append(format);