/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QIMAGEIOHANDLER_H
#define QIMAGEIOHANDLER_H

#include <QtCore/qplugin.h>
#include <QtCore/qfactoryinterface.h>

QT_MODULE(Gui)

class QImage;
class QRect;
class QSize;
class QVariant;

class QImageIOHandlerPrivate;
class Q_GUI_EXPORT QImageIOHandler
{
    Q_DECLARE_PRIVATE(QImageIOHandler)
public:
    QImageIOHandler();
    virtual ~QImageIOHandler();

    void setDevice(QIODevice *device);
    QIODevice *device() const;

    void setFormat(const QByteArray &format);
    QByteArray format() const;

    virtual QByteArray name() const = 0;

    virtual bool canRead() const = 0;
    virtual bool read(QImage *image) = 0;
    virtual bool write(const QImage &image);

    enum ImageOption {
        Size,
        ClipRect,
        Description,
        ScaledClipRect,
        ScaledSize,
        CompressionRatio,
        Gamma,
        Quality,
        Name,
        SubType,
        IncrementalReading,
        Endianness
    };
    virtual QVariant option(ImageOption option) const;
    virtual void setOption(ImageOption option, const QVariant &value);
    virtual bool supportsOption(ImageOption option) const;

    // incremental loading
    virtual bool jumpToNextImage();
    virtual bool jumpToImage(int imageNumber);
    virtual int loopCount() const;
    virtual int imageCount() const;
    virtual int nextImageDelay() const;
    virtual int currentImageNumber() const;
    virtual QRect currentImageRect() const;

protected:
    QImageIOHandler(QImageIOHandlerPrivate &dd);
    QImageIOHandlerPrivate *d_ptr;
};

struct Q_GUI_EXPORT QImageIOHandlerFactoryInterface : public QFactoryInterface
{
    virtual QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const = 0;
};

#define QImageIOHandlerFactoryInterface_iid "com.trolltech.Qt.QImageIOHandlerFactoryInterface"
Q_DECLARE_INTERFACE(QImageIOHandlerFactoryInterface, QImageIOHandlerFactoryInterface_iid)

class Q_GUI_EXPORT QImageIOPlugin : public QObject, public QImageIOHandlerFactoryInterface
{
    Q_OBJECT
    Q_INTERFACES(QImageIOHandlerFactoryInterface:QFactoryInterface)
public:
    explicit QImageIOPlugin(QObject *parent = 0);
    virtual ~QImageIOPlugin();

    enum Capability {
        CanRead = 0x1,
        CanWrite = 0x2,
        CanReadIncremental = 0x4
    };
    Q_DECLARE_FLAGS(Capabilities, Capability)

    virtual Capabilities capabilities(QIODevice *device, const QByteArray &format) const = 0;
    virtual QStringList keys() const = 0;
    virtual QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const = 0;
};

#endif
