distancefieldmodelworker.h

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// Copyright (C) 2018 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#ifndef DISTANCEFIELDMODELWORKER_H

#define DISTANCEFIELDMODELWORKER_H

#include <QObject>

#include <QRawFont>

#include <QtGui/private/qtextengine_p.h>

QT_BEGIN_NAMESPACE

struct CmapSubtable0;

struct CmapSubtable4;

struct CmapSubtable6;

struct CmapSubtable10;

struct CmapSubtable12;

class DistanceFieldModelWorker : public QObject

    Q_OBJECT

public:

    explicit DistanceFieldModelWorker(QObject *parent = nullptr);

    Q_INVOKABLE void generateOneDistanceField();

    Q_INVOKABLE void loadFont(const QString &fileName);

    void readCmapSubtable(const CmapSubtable0 *subtable, const void *end);

    void readCmapSubtable(const CmapSubtable4 *subtable, const void *end);

    void readCmapSubtable(const CmapSubtable6 *subtable, const void *end);

    void readCmapSubtable(const CmapSubtable10 *subtable, const void *end);

    void readCmapSubtable(const CmapSubtable12 *subtable, const void *end);

signals:

    void fontLoaded(quint16 glyphCount, bool doubleResolution, qreal pixelSize);

    void fontGenerated();

    void distanceFieldGenerated(const QImage &distanceField,

                                const QPainterPath &path,

                                glyph_t glyphId,

                                quint32 cmapAssignment);

    void error(const QString &errorString);

private:

    void readGlyphCount();

    void readCmap();

    QRawFont m_font;

    quint16 m_glyphCount;

    quint16 m_nextGlyphId;

    bool m_doubleGlyphResolution;

    QHash<glyph_t, quint32> m_cmapping;

};

QT_END_NAMESPACE

#endif // DISTANCEFIELDMODELWORKER_H