qasyncimageio.h

/****************************************************************************
** $Id: qasyncimageio.h,v 1.23 1999/04/28 09:55:38 aavit Exp $
**
**                    ***   INTERNAL HEADER FILE   ***
**
**              This file is NOT a part of the Qt interface!
**
** Definition of asynchronous image/movie loading classes
**
** Created : 970617
**
** Copyright (C) 1992-1999 Troll Tech AS.  All rights reserved.
**
** This file is part of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Troll Tech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** Licensees holding valid Qt Professional Edition licenses may use this
** file in accordance with the Qt Professional Edition License Agreement
** provided with the Qt Professional Edition.
**
** See http://www.troll.no/pricing.html or email sales@troll.no for
** information about the Professional Edition licensing, or see
** http://www.troll.no/qpl/ for QPL licensing information.
**
*****************************************************************************/

#ifndef QASYNCIMAGEIO_H
#define QASYNCIMAGEIO_H

#ifndef QT_H
#include "qimage.h"
#endif // QT_H



class Q_EXPORT QImageConsumer {
public:
    virtual void end()=0;

    // Change transfer type 1.
    virtual void changed(const QRect&)=0;
    virtual void frameDone()=0;

    // Change transfer type 2.
    virtual void frameDone(const QPoint&, const QRect&)=0;

    virtual void setLooping(int)=0;
    virtual void setFramePeriod(int)=0;
    virtual void setSize(int, int)=0;
};

class Q_EXPORT QImageFormat {
public:
    virtual ~QImageFormat();
    virtual int decode(QImage& img, QImageConsumer* consumer,
            const uchar* buffer, int length)=0;
};

class Q_EXPORT QImageFormatType {
public:
    virtual ~QImageFormatType();
    virtual QImageFormat* decoderFor(const uchar* buffer, int length)=0;
    virtual const char* formatName() const=0;
protected:
    QImageFormatType();
};

struct QImageDecoderPrivate;

class Q_EXPORT QImageDecoder {
public:
    QImageDecoder(QImageConsumer* c);
    ~QImageDecoder();

    const QImage& image() { return img; }
    int decode(const uchar* buffer, int length);

    static const char* formatName(const uchar* buffer, int length);

    static QStrList inputFormats();
    static void registerDecoderFactory(QImageFormatType*);
    static void unregisterDecoderFactory(QImageFormatType*);

private:
    QImageFormat* actual_decoder;
    QImageConsumer* consumer;
    QImage img;
    QImageDecoderPrivate *d;
};


#endif // QASYNCIMAGEIO_H