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

**

** 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.

**

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

#include "hbeglstate_p.h"

#include <QMutexLocker>

Q_GLOBAL_STATIC(HbEglStates, instance)

HbEglStates::HbEglStates( EGLDisplay d,

                          EGLSurface rs,

                          EGLSurface ds,

                          EGLContext  c,

                          EGLConfig cfg )

        : refCount(0),

        init(0),

        background(0)

{

    fgWatcher = HbForegroundWatcher::instance();

    connect(fgWatcher, SIGNAL(foregroundLost()),

            SLOT(handleForegroundLost()));

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

}

HbEglStates::HbEglStates()

        : refCount(0),

        init(0),

        background(0)

{

    fgWatcher = HbForegroundWatcher::instance();

    connect(fgWatcher, SIGNAL(foregroundLost()),

            SLOT(handleForegroundLost()));

    reset();

}

void HbEglStates::handleForegroundLost()

{

    reset();

    background = 1;

    init = 0;

    HbNVGEnginePool::instance()->resetNVGEngine();

    clearImages();

}

void HbEglStates::handleForegroundGained()

{

    background = 0;

}

void HbEglStates::clearImages()

{

    if (!imageList.empty()) {

        QMutexLocker locker(&mutex);

        ImageListIter iter = imageList.begin();

        for (; iter != imageList.end(); ++iter) {

            VGImage * imgPtr = *iter;

            if (*imgPtr) {

                vgDestroyImage(*imgPtr);

                *imgPtr = 0;

            }

        }

        imageList.clear();

    }

}

void HbEglStates::reset( EGLDisplay d,

                         EGLSurface rs,

                         EGLSurface ds,

                         EGLContext  c,

                         EGLConfig cfg )

{

    display = d;

    currentReadSurface = rs;

    currentWriteSurface = ds;

    eglContext = c;

    eglConfig = cfg;

}

void HbEglStateRestorer::restore()

{

    if (restored) {

        return;

    }

    if (eglContext != EGL_NO_CONTEXT && currentWriteSurface != EGL_NO_SURFACE) {

        if (eglMakeCurrent(display, currentWriteSurface,

                           currentReadSurface, eglContext) == EGL_FALSE) {

        } else {

            restored = 1;

        }

    }

}

void HbEglStates::removeVGImage( VGImage * image )

{

    QMutexLocker locker(&mutex);

    if (imageList.contains(image)) {

        if (*image) {

            vgDestroyImage(*image);

            *image = 0;

        }

        imageList.remove(image);

    }

}

HbEglStates * HbEglStates::global()

{

    return instance();

}