diff -r 000000000000 -r 1918ee327afb src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plugins/graphicssystems/trace/qgraphicssystem_trace.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,143 @@
+/****************************************************************************
+**
+** 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 plugins 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 "qgraphicssystem_trace_p.h"
+#include <private/qpixmap_raster_p.h>
+#include <private/qpaintbuffer_p.h>
+#include <private/qwindowsurface_raster_p.h>
+
+#include <QFile>
+#include <QPainter>
+#include <QtDebug>
+
+QT_BEGIN_NAMESPACE
+
+class QTraceWindowSurface : public QRasterWindowSurface
+{
+public:
+    QTraceWindowSurface(QWidget *widget);
+    ~QTraceWindowSurface();
+
+    QPaintDevice *paintDevice();
+    void beginPaint(const QRegion &rgn);
+    void endPaint(const QRegion &rgn);
+
+    bool scroll(const QRegion &area, int dx, int dy);
+
+private:
+    QPaintBuffer *buffer;
+    QList<QRegion> updates;
+
+    qulonglong winId;
+};
+
+QTraceWindowSurface::QTraceWindowSurface(QWidget *widget)
+    : QRasterWindowSurface(widget)
+    , buffer(0)
+    , winId(0)
+{
+}
+
+QTraceWindowSurface::~QTraceWindowSurface()
+{
+    if (buffer) {
+        QFile outputFile(QString(QLatin1String("qtgraphics-%0.trace")).arg(winId));
+        if (outputFile.open(QIODevice::WriteOnly)) {
+            QDataStream out(&outputFile);
+            out << *buffer << updates;
+        }
+        delete buffer;
+    }
+}
+
+QPaintDevice *QTraceWindowSurface::paintDevice()
+{
+    if (!buffer) {
+        buffer = new QPaintBuffer;
+        buffer->setBoundingRect(geometry());
+    }
+    return buffer;
+}
+
+void QTraceWindowSurface::beginPaint(const QRegion &rgn)
+{
+    // ensure paint buffer is created
+    paintDevice();
+    buffer->beginNewFrame();
+
+    QRasterWindowSurface::beginPaint(rgn);
+}
+
+void QTraceWindowSurface::endPaint(const QRegion &rgn)
+{
+    QPainter p(QRasterWindowSurface::paintDevice());
+    buffer->draw(&p, buffer->numFrames()-1);
+    p.end();
+
+    winId = (qulonglong)window()->winId();
+
+    updates << rgn;
+
+    QRasterWindowSurface::endPaint(rgn);
+}
+
+bool QTraceWindowSurface::scroll(const QRegion &, int, int)
+{
+    // TODO: scrolling should also be streamed and replayed
+    // to test scrolling performance
+    return false;
+}
+
+QTraceGraphicsSystem::QTraceGraphicsSystem()
+{
+}
+
+QPixmapData *QTraceGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const
+{
+    return new QRasterPixmapData(type);
+}
+
+QWindowSurface *QTraceGraphicsSystem::createWindowSurface(QWidget *widget) const
+{
+    return new QTraceWindowSurface(widget);
+}
+
+QT_END_NAMESPACE