qasyncimageio.h Include File

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# qasyncimageio.h

This is the verbatim text of the qasyncimageio.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/qasyncimageio.h   3.3.3   edited May 27 2003 $
    **
    ** Definition of asynchronous image/movie loading classes
    **
    ** Created : 970617
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QASYNCIMAGEIO_H
    #define QASYNCIMAGEIO_H

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

    #ifndef QT_NO_ASYNC_IMAGE_IO

    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();
    };

    class 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 QImageFormatType* format( const char* name ); // direct use - no decode()

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

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

    #endif // QT_NO_ASYNC_IMAGE_IO

    #endif // QASYNCIMAGEIO_H