xcb: replace inefficient uses of QList with QVector

xcb atoms are uint32s, so a QList of them wastes 50% memory on 64-bit
platforms. Other parts of the code already store xcb_atom_t's in QVector,
so use QVector everywhere (also leads to less code expansion).

Change-Id: Ib4afb35e499577a7509d04a18b830d9b31f6abd0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/plugins/platforms/xcb/qxcbmime.cpp b/src/plugins/platforms/xcb/qxcbmime.cpp
index b205a63267..c0f6745e7f 100644
--- a/src/plugins/platforms/xcb/qxcbmime.cpp
+++ b/src/plugins/platforms/xcb/qxcbmime.cpp
@@ -136,9 +136,10 @@ bool QXcbMime::mimeDataForAtom(QXcbConnection *connection, xcb_atom_t a, QMimeDa
     return ret;
 }
 
-QList<xcb_atom_t> QXcbMime::mimeAtomsForFormat(QXcbConnection *connection, const QString &format)
+QVector<xcb_atom_t> QXcbMime::mimeAtomsForFormat(QXcbConnection *connection, const QString &format)
 {
-    QList<xcb_atom_t> atoms;
+    QVector<xcb_atom_t> atoms;
+    atoms.reserve(7);
     atoms.append(connection->internAtom(format.toLatin1()));
 
     // special cases for strings
@@ -240,7 +241,7 @@ QVariant QXcbMime::mimeConvertToFormat(QXcbConnection *connection, xcb_atom_t a,
 }
 
 xcb_atom_t QXcbMime::mimeAtomForFormat(QXcbConnection *connection, const QString &format, QVariant::Type requestedType,
-                                 const QList<xcb_atom_t> &atoms, QByteArray *requestedEncoding)
+                                 const QVector<xcb_atom_t> &atoms, QByteArray *requestedEncoding)
 {
     requestedEncoding->clear();