qrawfont.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 QRAWFONT_H
#define QRAWFONT_H
 
#include <QtGui/qtguiglobal.h>
#include <QtCore/qstring.h>
#include <QtCore/qiodevice.h>
#include <QtCore/qglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qpoint.h>
#include <QtGui/qfont.h>
#include <QtGui/qtransform.h>
#include <QtGui/qfontdatabase.h>
 
#if !defined(QT_NO_RAWFONT)
 
QT_BEGIN_NAMESPACE
 
 
class QRawFontPrivate;
class Q_GUI_EXPORT QRawFont
{
public:
    enum AntialiasingType {
        PixelAntialiasing,
        SubPixelAntialiasing
    };
 
    enum LayoutFlag {
        SeparateAdvances = 0,
        KernedAdvances = 1,
        UseDesignMetrics = 2
    };
    Q_DECLARE_FLAGS(LayoutFlags, LayoutFlag)
 
    QRawFont();
    QRawFont(const QString &fileName,
             qreal pixelSize,
             QFont::HintingPreference hintingPreference = QFont::PreferDefaultHinting);
    QRawFont(const QByteArray &fontData,
             qreal pixelSize,
             QFont::HintingPreference hintingPreference = QFont::PreferDefaultHinting);
    QRawFont(const QRawFont &other);
    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QRawFont)
    QRawFont &operator=(const QRawFont &other);
    ~QRawFont();
 
    void swap(QRawFont &other) noexcept { d.swap(other.d); }
 
    bool isValid() const;
 
    bool operator==(const QRawFont &other) const;
    inline bool operator!=(const QRawFont &other) const
    { return !operator==(other); }
 
    QString familyName() const;
    QString styleName() const;
 
    QFont::Style style() const;
    int weight() const;
 
    QList<quint32> glyphIndexesForString(const QString &text) const;
    inline QList<QPointF> advancesForGlyphIndexes(const QList<quint32> &glyphIndexes) const;
    inline QList<QPointF> advancesForGlyphIndexes(const QList<quint32> &glyphIndexes,
                                                  LayoutFlags layoutFlags) const;
    bool glyphIndexesForChars(const QChar *chars, int numChars, quint32 *glyphIndexes, int *numGlyphs) const;
    bool advancesForGlyphIndexes(const quint32 *glyphIndexes, QPointF *advances, int numGlyphs) const;
    bool advancesForGlyphIndexes(const quint32 *glyphIndexes, QPointF *advances, int numGlyphs, LayoutFlags layoutFlags) const;
 
    QImage alphaMapForGlyph(quint32 glyphIndex,
                            AntialiasingType antialiasingType = SubPixelAntialiasing,
                            const QTransform &transform = QTransform()) const;
    QPainterPath pathForGlyph(quint32 glyphIndex) const;
    QRectF boundingRect(quint32 glyphIndex) const;
 
    void setPixelSize(qreal pixelSize);
    qreal pixelSize() const;
 
    QFont::HintingPreference hintingPreference() const;
 
    qreal ascent() const;
    qreal capHeight() const;
    qreal descent() const;
    qreal leading() const;
    qreal xHeight() const;
    qreal averageCharWidth() const;
    qreal maxCharWidth() const;
    qreal lineThickness() const;
    qreal underlinePosition() const;
 
    qreal unitsPerEm() const;
 
    void loadFromFile(const QString &fileName,
                      qreal pixelSize,
                      QFont::HintingPreference hintingPreference);
 
    void loadFromData(const QByteArray &fontData,
                      qreal pixelSize,
                      QFont::HintingPreference hintingPreference);
 
    bool supportsCharacter(uint ucs4) const;
    bool supportsCharacter(QChar character) const;
    QList<QFontDatabase::WritingSystem> supportedWritingSystems() const;
 
    QByteArray fontTable(const char *tagName) const;
    QByteArray fontTable(QFont::Tag tag) const;
 
    static QRawFont fromFont(const QFont &font,
                             QFontDatabase::WritingSystem writingSystem = QFontDatabase::Any);
 
private:
    friend class QRawFontPrivate;
    friend class QTextLayout;
    friend class QTextEngine;
 
    QExplicitlySharedDataPointer<QRawFontPrivate> d;
};
 
Q_DECLARE_SHARED(QRawFont)
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QRawFont::LayoutFlags)
 
Q_GUI_EXPORT size_t qHash(const QRawFont &font, size_t seed = 0) noexcept;
 
inline QList<QPointF> QRawFont::advancesForGlyphIndexes(const QList<quint32> &glyphIndexes,
                                                        QRawFont::LayoutFlags layoutFlags) const
{
    QList<QPointF> advances(glyphIndexes.size());
    if (advancesForGlyphIndexes(glyphIndexes.constData(), advances.data(), int(glyphIndexes.size()), layoutFlags))
        return advances;
    return QList<QPointF>();
}
 
inline QList<QPointF> QRawFont::advancesForGlyphIndexes(const QList<quint32> &glyphIndexes) const
{
    return advancesForGlyphIndexes(glyphIndexes, QRawFont::SeparateAdvances);
}
 
QT_END_NAMESPACE
 
#endif // QT_NO_RAWFONT
 
#endif // QRAWFONT_H