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# qpngio.h

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

    /****************************************************************************
    ** $Id: qt/qpngio.h   3.3.4   edited May 27 2003 $
    **
    ** Definition of PNG QImage IOHandler
    **
    ** Created : 970521
    **
    ** Copyright (C) 1992-1998 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
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    **
    **********************************************************************/

    #ifndef QPNGIO_H
    #define QPNGIO_H

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

    #ifndef QT_NO_IMAGEIO_PNG

    void qInitPngIO();

    class QIODevice;

    #ifndef Q_PNGEXPORT
    #if !defined(QT_PLUGIN)
    #define Q_PNGEXPORT Q_EXPORT
    #else
    #define Q_PNGEXPORT
    #endif
    #endif

    class Q_PNGEXPORT QPNGImageWriter {
    public:
        QPNGImageWriter(QIODevice*);
        ~QPNGImageWriter();

        enum DisposalMethod { Unspecified, NoDisposal, RestoreBackground, RestoreImage };
        void setDisposalMethod(DisposalMethod);
        void setLooping(int loops=0); // 0 == infinity
        void setFrameDelay(int msecs);
        void setGamma(float);

        bool writeImage(const QImage& img, int x, int y);
        bool writeImage(const QImage& img, int quality, int x, int y);
        bool writeImage(const QImage& img)
    	{ return writeImage(img, 0, 0); }
        bool writeImage(const QImage& img, int quality)
    	{ return writeImage(img, quality, 0, 0); }

        QIODevice* device() { return dev; }

    private:
        QIODevice* dev;
        int frames_written;
        DisposalMethod disposal;
        int looping;
        int ms_delay;
        float gamma;
    };

    class Q_PNGEXPORT QPNGImagePacker : public QPNGImageWriter {
    public:
        QPNGImagePacker(QIODevice*, int depth, int convflags);

        void setPixelAlignment(int x);
        bool packImage(const QImage& img);

    private:
        QImage previous;
        int depth;
        int convflags;
        int alignx;
    };

    #endif // QT_NO_IMAGEIO_PNG

    #endif // QPNGIO_H