/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** 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 developer.feedback@nokia.com.

**

****************************************************************************/

#ifndef HBEGLSTATE_P_H

#define HBEGLSTATE_P_H

#include <EGL/egl.h>

#include <VG/openvg.h>

#include <QMutex>

#include <QSet>

#include "hbnvgiconimpl_p.h"

#include "hbnvgenginepool_p.h"

class HbEglStates: public QObject

{

    Q_OBJECT

public:

    HbEglStates( EGLDisplay d,

                 EGLSurface rs,

                 EGLSurface ds,

                 EGLContext  c,

                 EGLConfig cfg = 0 );

    HbEglStates();

    ~HbEglStates()

    {

        clearImages();

    }

    void set( EGLDisplay d,

              EGLSurface rs,

              EGLSurface ds,

              EGLContext c,

              EGLConfig cfg = 0 )

    {

        reset(d, rs, ds, c, cfg);

        init = 1;

    }

    void ref()

    {

        ++refCount;

    }

    int initialized() const

    {

        return init;

    }

    {

        if (instance && --(instance->refCount) == 0) {

        }

    }

    {

        if (image) {

            imageList.insert(image);

        }

    }

    void handleForegroundLost();

    EGLDisplay  display;

    EGLSurface  currentReadSurface;

    EGLSurface  currentWriteSurface;

    EGLContext  eglContext;

    EGLConfig   eglConfig;

    static HbEglStates *global();

private:

    void clearImages();

    void reset( EGLDisplay d = 0,

                EGLSurface rs = 0,

                EGLSurface ds = 0,

                EGLContext  c = 0,

                EGLConfig cfg = 0 );

    typedef ImageList::iterator ImageListIter;

};

 *

 * Saves the EGL state passed in the constructor.

 * This class will help in saving the state even in the case of exception.

 */

class HbEglStateRestorer

{

public:

    HbEglStateRestorer( EGLDisplay d,

                        EGLSurface rs,

                        EGLSurface ds,

                        EGLContext c )

            : display(d),

              currentReadSurface(rs),

              currentWriteSurface(ds),

    {

    }

    void restore();

    ~HbEglStateRestorer()

    {

        restore();

    }

private:

    EGLDisplay  display;

    EGLSurface  currentReadSurface;

    EGLSurface  currentWriteSurface;

    EGLContext  eglContext;

    EGLConfig   eglConfig;

    int         restored;

};