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diff --git a/src/opengl/qglcolormap.cpp b/src/opengl/qglcolormap.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \class QGLColormap
+    \brief The QGLColormap class is used for installing custom colormaps into
+    a QGLWidget.
+
+    \module OpenGL
+    \ingroup painting-3D
+    \ingroup shared
+
+    QGLColormap provides a platform independent way of specifying and
+    installing indexed colormaps for a QGLWidget. QGLColormap is
+    especially useful when using the OpenGL color-index mode.
+
+    Under X11 you must use an X server that supports either a \c
+    PseudoColor or \c DirectColor visual class. If your X server
+    currently only provides a \c GrayScale, \c TrueColor, \c
+    StaticColor or \c StaticGray visual, you will not be able to
+    allocate colorcells for writing. If this is the case, try setting
+    your X server to 8 bit mode. It should then provide you with at
+    least a \c PseudoColor visual. Note that you may experience
+    colormap flashing if your X server is running in 8 bit mode.
+
+    The size() of the colormap is always set to 256
+    colors. Note that under Windows you can also install colormaps
+    in child widgets.
+
+    This class uses \l{implicit sharing} as a memory and speed
+    optimization.
+
+    Example of use:
+    \snippet doc/src/snippets/code/src_opengl_qglcolormap.cpp 0
+
+    \sa QGLWidget::setColormap(), QGLWidget::colormap()
+*/
+
+/*!
+    \fn Qt::HANDLE QGLColormap::handle()
+
+    \internal
+
+    Returns the handle for this color map.
+*/
+
+/*!
+    \fn void QGLColormap::setHandle(Qt::HANDLE handle)
+
+    \internal
+
+    Sets the handle for this color map to \a handle.
+*/
+
+#include "qglcolormap.h"
+
+QT_BEGIN_NAMESPACE
+
+QGLColormap::QGLColormapData QGLColormap::shared_null = { Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0 };
+
+/*!
+    Construct a QGLColormap.
+*/
+QGLColormap::QGLColormap()
+    : d(&shared_null)
+{
+    d->ref.ref();
+}
+
+
+/*!
+    Construct a shallow copy of \a map.
+*/
+QGLColormap::QGLColormap(const QGLColormap &map)
+    : d(map.d)
+{
+    d->ref.ref();
+}
+
+/*!
+    Dereferences the QGLColormap and deletes it if this was the last
+    reference to it.
+*/
+QGLColormap::~QGLColormap()
+{
+    if (!d->ref.deref())
+        cleanup(d);
+}
+
+void QGLColormap::cleanup(QGLColormap::QGLColormapData *x)
+{
+    delete x->cells;
+    x->cells = 0;
+    delete x;
+}
+
+/*!
+    Assign a shallow copy of \a map to this QGLColormap.
+*/
+QGLColormap & QGLColormap::operator=(const QGLColormap &map)
+{
+    map.d->ref.ref();
+    if (!d->ref.deref())
+        cleanup(d);
+    d = map.d;
+    return *this;
+}
+
+/*!
+    \fn void QGLColormap::detach()
+    \internal
+
+    Detaches this QGLColormap from the shared block.
+*/
+
+void QGLColormap::detach_helper()
+{
+    QGLColormapData *x = new QGLColormapData;
+    x->ref = 1;
+    x->cmapHandle = 0;
+    x->cells = 0;
+    if (d->cells) {
+        x->cells = new QVector<QRgb>(256);
+        *x->cells = *d->cells;
+    }
+    if (!d->ref.deref())
+        cleanup(d);
+    d = x;
+}
+
+/*!
+    Set cell at index \a idx in the colormap to color \a color.
+*/
+void QGLColormap::setEntry(int idx, QRgb color)
+{
+    detach();
+    if (!d->cells)
+        d->cells = new QVector<QRgb>(256);
+    d->cells->replace(idx, color);
+}
+
+/*!
+    Set an array of cells in this colormap. \a count is the number of
+    colors that should be set, \a colors is the array of colors, and
+    \a base is the starting index.  The first element in \a colors
+    is set at \a base in the colormap.
+*/
+void QGLColormap::setEntries(int count, const QRgb *colors, int base)
+{
+    detach();
+    if (!d->cells)
+        d->cells = new QVector<QRgb>(256);
+
+    Q_ASSERT_X(colors && base >= 0 && (base + count) <= d->cells->size(), "QGLColormap::setEntries",
+               "preconditions not met");
+    for (int i = 0; i < count; ++i)
+        setEntry(base + i, colors[i]);
+}
+
+/*!
+    Returns the QRgb value in the colorcell with index \a idx.
+*/
+QRgb QGLColormap::entryRgb(int idx) const
+{
+    if (d == &shared_null || !d->cells)
+        return 0;
+    else
+        return d->cells->at(idx);
+}
+
+/*!
+    \overload
+
+    Set the cell with index \a idx in the colormap to color \a color.
+*/
+void QGLColormap::setEntry(int idx, const QColor &color)
+{
+    setEntry(idx, color.rgb());
+}
+
+/*!
+    Returns the QRgb value in the colorcell with index \a idx.
+*/
+QColor QGLColormap::entryColor(int idx) const
+{
+    if (d == &shared_null || !d->cells)
+        return QColor();
+    else
+        return QColor(d->cells->at(idx));
+}
+
+/*!
+    Returns true if the colormap is empty or it is not in use
+    by a QGLWidget; otherwise returns false.
+
+    A colormap with no color values set is considered to be empty.
+    For historical reasons, a colormap that has color values set
+    but which is not in use by a QGLWidget is also considered empty.
+
+    Compare size() with zero to determine if the colormap is empty
+    regardless of whether it is in use by a QGLWidget or not.
+
+    \sa size()
+*/
+bool QGLColormap::isEmpty() const
+{
+    return d == &shared_null || d->cells == 0 || d->cells->size() == 0 || d->cmapHandle == 0;
+}
+
+
+/*!
+    Returns the number of colorcells in the colormap.
+*/
+int QGLColormap::size() const
+{
+    return d->cells ? d->cells->size() : 0;
+}
+
+/*!
+    Returns the index of the color \a color. If \a color is not in the
+    map, -1 is returned.
+*/
+int QGLColormap::find(QRgb color) const
+{
+    if (d->cells)
+        return d->cells->indexOf(color);
+    return -1;
+}
+
+/*!
+    Returns the index of the color that is the closest match to color
+    \a color.
+*/
+int QGLColormap::findNearest(QRgb color) const
+{
+    int idx = find(color);
+    if (idx >= 0)
+        return idx;
+    int mapSize = size();
+    int mindist = 200000;
+    int r = qRed(color);
+    int g = qGreen(color);
+    int b = qBlue(color);
+    int rx, gx, bx, dist;
+    for (int i = 0; i < mapSize; ++i) {
+        QRgb ci = d->cells->at(i);
+        rx = r - qRed(ci);
+        gx = g - qGreen(ci);
+        bx = b - qBlue(ci);
+        dist = rx * rx + gx * gx + bx * bx;        // calculate distance
+        if (dist < mindist) {                // minimal?
+            mindist = dist;
+            idx = i;
+        }
+    }
+    return idx;
+}
+
+QT_END_NAMESPACE