diff -r 000000000000 -r 1918ee327afb src/gui/painting/qregion_x11.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/painting/qregion_x11.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,92 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qt_x11_p.h>
+
+#include <limits.h>
+
+QT_BEGIN_NAMESPACE
+
+QRegion::QRegionData QRegion::shared_empty = {Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0, 0};
+
+void QRegion::updateX11Region() const
+{
+    d->rgn = XCreateRegion();
+    if (!d->qt_rgn)
+        return;
+
+    int n = d->qt_rgn->numRects;
+    const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());
+    while (n--) {
+        XRectangle r;
+        r.x = qMax(SHRT_MIN, rect->x());
+        r.y = qMax(SHRT_MIN, rect->y());
+        r.width = qMin((int)USHRT_MAX, rect->width());
+        r.height = qMin((int)USHRT_MAX, rect->height());
+        XUnionRectWithRegion(&r, d->rgn, d->rgn);
+        ++rect;
+    }
+}
+
+void *QRegion::clipRectangles(int &num) const
+{
+    if (!d->xrectangles && !(d == &shared_empty || d->qt_rgn->numRects == 0)) {
+        XRectangle *r = static_cast<XRectangle*>(malloc(d->qt_rgn->numRects * sizeof(XRectangle)));
+        d->xrectangles = r;
+        int n = d->qt_rgn->numRects;
+        const QRect *rect = (n == 1 ? &d->qt_rgn->extents : d->qt_rgn->rects.constData());
+        while (n--) {
+            r->x = qMax(SHRT_MIN, rect->x());
+            r->y = qMax(SHRT_MIN, rect->y());
+            r->width = qMin((int)USHRT_MAX, rect->width());
+            r->height = qMin((int)USHRT_MAX, rect->height());
+            ++r;
+            ++rect;
+        }
+    }
+    if (d == &shared_empty || d->qt_rgn->numRects == 0)
+        num = 0;
+    else
+        num = d->qt_rgn->numRects;
+    return d->xrectangles;
+}
+
+QT_END_NAMESPACE