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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QGLCOLORMAP_H
#define QGLCOLORMAP_H

#include <QtGui/qcolor.h>
#include <QtCore/qvector.h>
#include <QtOpenGL/qtopenglglobal.h>

QT_BEGIN_NAMESPACE


class Q_OPENGL_EXPORT QGLColormap
{
public:
    QGLColormap();
    QGLColormap(const QGLColormap &);
    ~QGLColormap();

    QGLColormap &operator=(const QGLColormap &);

    bool   isEmpty() const;
    int    size() const;
    void   detach();

    void   setEntries(int count, const QRgb * colors, int base = 0);
    void   setEntry(int idx, QRgb color);
    void   setEntry(int idx, const QColor & color);
    QRgb   entryRgb(int idx) const;
    QColor entryColor(int idx) const;
    int    find(QRgb color) const;
    int    findNearest(QRgb color) const;

protected:
    Qt::HANDLE handle() { return d ? d->cmapHandle : 0; }
    void setHandle(Qt::HANDLE ahandle) { d->cmapHandle = ahandle; }

private:
    struct QGLColormapData {
        QBasicAtomicInt ref;
        QVector<QRgb> *cells;
        Qt::HANDLE cmapHandle;
    };

    QGLColormapData *d;
    static struct QGLColormapData shared_null;
    static void cleanup(QGLColormapData *x);
    void detach_helper();

    friend class QGLWidget;
    friend class QGLWidgetPrivate;
};

inline void QGLColormap::detach()
{
    if (d->ref.load() != 1)
        detach_helper();
}

QT_END_NAMESPACE

#endif // QGLCOLORMAP_H