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This is the verbatim text of the qpngio.h include file. It is provided only for illustration; the copyright remains with Troll Tech.
** $Id: qpngio.h,v 1999/07/08 13:35:25 paul Exp $
** Definition of PNG QImage IOHandler
** Created : 970521
** Copyright (C) 1992-1998 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 QPNGIO_H
#define QPNGIO_H

#include <qimage.h>

void qInitPngIO();

class QIODevice;
class QImage;

class Q_EXPORT QPNGImageWriter {

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

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

    QIODevice* device() { return dev; }

    QIODevice* dev;
    int frames_written;
    DisposalMethod disposal;
    int looping;
    int ms_delay;

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

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

    QImage previous;
    int depth;
    int convflags;
    int alignx;


Copyright 1999 Troll TechTrademarks
Qt version 2.0.2