qwebphandler_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QWEBPHANDLER_P_H
#define QWEBPHANDLER_P_H
 
#include <QtGui/qcolor.h>
#include <QtGui/qcolorspace.h>
#include <QtGui/qimage.h>
#include <QtGui/qimageiohandler.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qsize.h>
 
#include "webp/decode.h"
#include "webp/demux.h"
 
QT_BEGIN_NAMESPACE
 
class QWebpHandler : public QImageIOHandler
{
public:
    QWebpHandler();
    ~QWebpHandler();
 
public:
    bool canRead() const override;
    bool read(QImage *image) override;
 
    static bool canRead(QIODevice *device);
 
    bool write(const QImage &image) override;
    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 currentImageNumber() const override;
    QRect currentImageRect() const override;
    int loopCount() const override;
    int nextImageDelay() const override;
 
private:
    bool ensureScanned() const;
    bool ensureDemuxer();
 
private:
    enum ScanState {
        ScanError = -1,
        ScanNotScanned = 0,
        ScanSuccess = 1,
    };
 
    int m_quality;
    mutable ScanState m_scanState;
    WebPBitstreamFeatures m_features;
    uint32_t m_formatFlags;
    int m_loop;
    int m_frameCount;
    QColor m_bgColor;
    QByteArray m_rawData;
    WebPData m_webpData;
    WebPDemuxer *m_demuxer;
    WebPIterator m_iter;
    QColorSpace m_colorSpace;
    QImage *m_composited;   // For animation frames composition
};
 
QT_END_NAMESPACE
 
#endif // WEBPHANDLER_H