qt-everywhere-src-5.14.1/qtbase/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h

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#ifndef QWINDOWSFONTENGINEDIRECTWRITE_H
#define QWINDOWSFONTENGINEDIRECTWRITE_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 <QtCore/qglobal.h>

#ifndef QT_NO_DIRECTWRITE

#include <QtGui/private/qfontengine_p.h>
#include <QtCore/QSharedPointer>

struct IDWriteFont;
struct IDWriteFontFace;
struct IDWriteFontFile;
struct IDWriteFactory;
struct IDWriteBitmapRenderTarget;
struct IDWriteGdiInterop;
struct IDWriteGlyphRunAnalysis;

QT_BEGIN_NAMESPACE

class QWindowsFontEngineData;

class QWindowsFontEngineDirectWrite : public QFontEngine
{
    Q_DISABLE_COPY_MOVE(QWindowsFontEngineDirectWrite)
public:
    explicit QWindowsFontEngineDirectWrite(IDWriteFontFace *directWriteFontFace,
                                    qreal pixelSize,
                                    const QSharedPointer<QWindowsFontEngineData> &d);
    ~QWindowsFontEngineDirectWrite() override;

    void initFontInfo(const QFontDef &request, int dpi);

    QFixed lineThickness() const override;
    QFixed underlinePosition() const override;
    bool getSfntTableData(uint tag, uchar *buffer, uint *length) const override;
    QFixed emSquareSize() const override;

    glyph_t glyphIndex(uint ucs4) const override;
    bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs,
                      ShaperFlags flags) const override;
    void recalcAdvances(QGlyphLayout *glyphs, ShaperFlags) const override;

    void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
                         QPainterPath *path, QTextItem::RenderFlags flags) override;

    glyph_metrics_t boundingBox(const QGlyphLayout &glyphs) override;
    glyph_metrics_t boundingBox(glyph_t g) override;
    glyph_metrics_t alphaMapBoundingBox(glyph_t glyph, QFixed,
                                        const QTransform &matrix, GlyphFormat) override;

    QFixed ascent() const override;
    QFixed capHeight() const override;
    QFixed descent() const override;
    QFixed leading() const override;
    QFixed xHeight() const override;
    qreal maxCharWidth() const override;
    FaceId faceId() const override;

    bool supportsSubPixelPositions() const override;

    QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition) override;
    QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t) override;
    QImage alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, const QTransform &xform) override;
    QImage bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform &t, const QColor &color) override;

    QFontEngine *cloneWithSize(qreal pixelSize) const override;
    Qt::HANDLE handle() const override;

    const QSharedPointer<QWindowsFontEngineData> &fontEngineData() const { return m_fontEngineData; }

    static QString fontNameSubstitute(const QString &familyName);

    IDWriteFontFace *directWriteFontFace() const { return m_directWriteFontFace; }

    void setUniqueFamilyName(const QString &newName) { m_uniqueFamilyName = newName; }

private:
    QImage imageForGlyph(glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform, const QColor &color = QColor());
    void collectMetrics();
    void renderGlyphRun(QImage *destination, float r, float g, float b, float a, IDWriteGlyphRunAnalysis *glyphAnalysis, const QRect &boundingRect);
    static QString filenameFromFontFile(IDWriteFontFile *fontFile);

    const QSharedPointer<QWindowsFontEngineData> m_fontEngineData;

    IDWriteFontFace *m_directWriteFontFace;
    IDWriteBitmapRenderTarget *m_directWriteBitmapRenderTarget;

    QFixed m_lineThickness;
    QFixed m_underlinePosition;
    int m_unitsPerEm;
    QFixed m_ascent;
    QFixed m_capHeight;
    QFixed m_descent;
    QFixed m_xHeight;
    QFixed m_lineGap;
    QFixed m_maxAdvanceWidth;
    FaceId m_faceId;
    QString m_uniqueFamilyName;
};

QT_END_NAMESPACE

#endif // QT_NO_DIRECTWRITE

#endif // QWINDOWSFONTENGINEDIRECTWRITE_H