/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
**
** WARNING:
**      A separate license from Unisys may be required to use the gif
**      reader. See http://www.unisys.com/about__unisys/lzw/
**      for information from Unisys
**
****************************************************************************/

#ifndef QGIFHANDLER_P_H
#define QGIFHANDLER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtGui/qimageiohandler.h>
#include <QtGui/qimage.h>
#include <QtCore/qbytearray.h>

QT_BEGIN_NAMESPACE

class QGIFFormat;
class QGifHandler : public QImageIOHandler
{
public:
    QGifHandler();
    ~QGifHandler();

    bool canRead() const override;
    bool read(QImage *image) override;
    bool write(const QImage &image) override;

    static bool canRead(QIODevice *device);

    QVariant option(ImageOption option) const override;
    void setOption(ImageOption option, const QVariant &value) override;
    bool supportsOption(ImageOption option) const override;

    int imageCount() const override;
    int loopCount() const override;
    int nextImageDelay() const override;
    int currentImageNumber() const override;

private:
    bool imageIsComing() const;
    QGIFFormat *gifFormat;
    QString fileName;
    mutable QByteArray buffer;
    mutable QImage lastImage;

    mutable int nextDelay;
    mutable int loopCnt;
    int frameNumber;
    mutable QVector<QSize> imageSizes;
    mutable bool scanIsCached;
};

QT_END_NAMESPACE

#endif // QGIFHANDLER_P_H