/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
** WARNING:
**      A separate license from Unisys may be required to use the gif
**      reader. See http://www.unisys.com/about__unisys/lzw/
**      for information from Unisys
**
****************************************************************************/

#ifndef QGIFHANDLER_P_H
#define QGIFHANDLER_P_H

#include <QtGui/qimageiohandler.h>
#include <QtGui/qimage.h>
#include <QtCore/qbytearray.h>

QT_BEGIN_NAMESPACE

class QGIFFormat;
class QGifHandler : public QImageIOHandler
{
public:
    QGifHandler();
    ~QGifHandler();

    bool canRead() const;
    bool read(QImage *image);
    bool write(const QImage &image);

    QByteArray name() const;

    static bool canRead(QIODevice *device);

    QVariant option(ImageOption option) const;
    void setOption(ImageOption option, const QVariant &value);
    bool supportsOption(ImageOption option) const;

    int imageCount() const;
    int loopCount() const;
    int nextImageDelay() const;
    int currentImageNumber() const;

private:
    bool imageIsComing() const;
    QGIFFormat *gifFormat;
    QString fileName;
    mutable QByteArray buffer;
    mutable QImage lastImage;

    mutable int nextDelay;
    mutable int loopCnt;
    int frameNumber;
    mutable QVector<QSize> imageSizes;
    mutable bool scanIsCached;
};

QT_END_NAMESPACE

#endif // QGIFHANDLER_P_H