qwindowsfontenginedirectwrite.h

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#ifndef QWINDOWSFONTENGINEDIRECTWRITE_H
#define QWINDOWSFONTENGINEDIRECTWRITE_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_DIRECTWRITE

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

class QWindowsFontEngineData;

struct IDWriteFont ;
struct IDWriteFontFace ;
struct IDWriteFactory ;
struct IDWriteBitmapRenderTarget ;
struct IDWriteGdiInterop ;

QT_BEGIN_NAMESPACE

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

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

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

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

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

    glyph_metrics_t boundingBox(const QGlyphLayout &glyphs);
    glyph_metrics_t boundingBox(glyph_t g);

    QFixed ascent() const;
    QFixed descent() const;
    QFixed leading() const;
    QFixed xHeight() const;
    qreal maxCharWidth() const;

    const char *name() const;

    bool supportsSubPixelPositions() const;

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

    QFontEngine *cloneWithSize(qreal pixelSize) const;

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

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

    static QString fontNameSubstitute(const QString &familyName);

private:
    QImage imageForGlyph(glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform);
    void collectMetrics();

    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_descent;
    QFixed m_xHeight;
    QFixed m_lineGap;
    FaceId m_faceId;
};

QT_END_NAMESPACE

#endif // QT_NO_DIRECTWRITE

#endif // QWINDOWSFONTENGINEDIRECTWRITE_H