qfontengine_coretext_p.h

// 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 QFONTENGINE_CORETEXT_P_H

#define QFONTENGINE_CORETEXT_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 <private/qfontengine_p.h>

#include <private/qcore_mac_p.h>

#include <QtCore/qloggingcategory.h>

#ifdef Q_OS_MACOS

#include <ApplicationServices/ApplicationServices.h>

#else

#include <CoreText/CoreText.h>

#include <CoreGraphics/CoreGraphics.h>

#endif

QT_BEGIN_NAMESPACE

class Q_GUI_EXPORT QCoreTextFontEngine : public QFontEngine

    Q_GADGET

public:

    QCoreTextFontEngine(CTFontRef font, const QFontDef &def);

    QCoreTextFontEngine(CGFontRef font, const QFontDef &def);

    ~QCoreTextFontEngine();

    int glyphCount() const override;

    glyph_t glyphIndex(uint ucs4) const override;

    QString glyphName(glyph_t index) const override;

    glyph_t findGlyph(QLatin1StringView name) const override;

    int stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, ShaperFlags flags) const override;

    void recalcAdvances(QGlyphLayout *, ShaperFlags) const override;

    glyph_metrics_t boundingBox(glyph_t glyph) override;

    QFixed capHeight() const override;

    QFixed xHeight() const override;

    qreal maxCharWidth() const override;

    QFixed averageCharWidth() const override;

    void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int numGlyphs,

                         QPainterPath *path, QTextItem::RenderFlags) override;

    bool canRender(const QChar *string, int len) const override;

    int synthesized() const override { return synthesisFlags; }

    bool supportsHorizontalSubPixelPositions() const override { return true; }

    bool supportsVerticalSubPixelPositions() const override { return false; }

    QFixed lineThickness() const override;

    QFixed underlinePosition() const override;

    void draw(CGContextRef ctx, qreal x, qreal y, const QTextItemInt &ti, int paintDeviceHeight);

    FaceId faceId() const override;

    bool getSfntTableData(uint /*tag*/, uchar * /*buffer*/, uint * /*length*/) const override;

    void getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics) override;

    QImage alphaMapForGlyph(glyph_t, const QFixedPoint &subPixelPosition) override;

    QImage alphaMapForGlyph(glyph_t glyph, const QFixedPoint &subPixelPosition, const QTransform &t) override;

    QImage alphaRGBMapForGlyph(glyph_t, const QFixedPoint &subPixelPosition, const QTransform &t) override;

    glyph_metrics_t alphaMapBoundingBox(glyph_t glyph, const QFixedPoint &, const QTransform &matrix, GlyphFormat) override;

    QImage bitmapForGlyph(glyph_t, const QFixedPoint &subPixelPosition, const QTransform &t, const QColor &color) override;

    QFixed emSquareSize() const override;

    void doKerning(QGlyphLayout *g, ShaperFlags flags) const override;

    bool supportsTransformation(const QTransform &transform) const override;

    bool expectsGammaCorrectedBlending(QFontEngine::GlyphFormat format = QFontEngine::Format_None) const override;

    QFontEngine *cloneWithSize(qreal pixelSize) const override;

    Qt::HANDLE handle() const override;

    int glyphMargin(QFontEngine::GlyphFormat format) override { Q_UNUSED(format); return 0; }

    QFontEngine::Properties properties() const override;

    QList<QFontVariableAxis> variableAxes() const override;

    enum FontSmoothing { Disabled, Subpixel, Grayscale };

    Q_ENUM(FontSmoothing);

    static FontSmoothing fontSmoothing();

    static qreal fontSmoothingGamma();

    static bool ct_getSfntTable(void *user_data, uint tag, uchar *buffer, uint *length);

    static QFont::Weight qtWeightFromCFWeight(float value);

    static QCoreTextFontEngine *create(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference, const QMap<QFont::Tag, float> &variableAxisValue);

protected:

    QCoreTextFontEngine(const QFontDef &def);

    void init();

    QImage imageForGlyph(glyph_t glyph, const QFixedPoint &subPixelPosition, const QTransform &m, const QColor &color = QColor());

    void loadAdvancesForGlyphs(QVarLengthArray<CGGlyph> &cgGlyphs, QGlyphLayout *glyphs) const;

    bool hasColorGlyphs() const;

    bool shouldAntialias() const;

    bool shouldSmoothFont() const;

    void initializeHeightMetrics() const override;

    QCFType<CTFontRef> ctfont;

    QCFType<CGFontRef> cgFont;

    int synthesisFlags;

    CGAffineTransform transform;

    QFixed avgCharWidth;

    QFixed underlineThickness;

    QFixed underlinePos;

    QFontEngine::FaceId face_id;

    mutable bool kerningPairsLoaded;

    QList<QFontVariableAxis> variableAxisList;

};

CGAffineTransform Q_GUI_EXPORT qt_transform_from_fontdef(const QFontDef &fontDef);

QT_END_NAMESPACE

#endif // QFONTENGINE_CORETEXT_P_H

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