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42 #ifndef QFONTENGINEDIRECTWRITE_H
43 #define QFONTENGINEDIRECTWRITE_H
45 #ifndef QT_NO_DIRECTWRITE
51 // This file is not part of the Qt API. It exists purely as an
52 // implementation detail. This header file may change from version to
53 // version without notice, or even be removed.
58 #include "private/qfontengine_p.h"
61 struct IDWriteFontFace ;
62 struct IDWriteFactory ;
63 struct IDWriteBitmapRenderTarget ;
64 struct IDWriteGdiInterop ;
68 class QFontEngineDirectWrite : public QFontEngine
72 explicit QFontEngineDirectWrite(IDWriteFactory *directWriteFactory,
73 IDWriteFontFace *directWriteFontFace,
75 ~QFontEngineDirectWrite();
77 QFixed lineThickness() const;
78 bool getSfntTableData(uint tag, uchar *buffer, uint *length) const;
79 QFixed emSquareSize() const;
81 bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const;
82 void recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const;
84 void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
85 QPainterPath *path, QTextItem::RenderFlags flags);
87 glyph_metrics_t boundingBox(const QGlyphLayout &glyphs);
88 glyph_metrics_t boundingBox(glyph_t g);
89 glyph_metrics_t alphaMapBoundingBox(glyph_t glyph,
90 QFixed subPixelPosition,
91 const QTransform &matrix,
94 QFixed ascent() const;
95 QFixed descent() const;
96 QFixed leading() const;
97 QFixed xHeight() const;
98 qreal maxCharWidth() const;
100 const char *name() const;
102 bool supportsSubPixelPositions() const;
104 QImage alphaMapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform &t);
105 QImage alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, int margin,
106 const QTransform &xform);
108 QFontEngine *cloneWithSize(qreal pixelSize) const;
110 bool canRender(const QChar *string, int len);
114 friend class QRawFontPrivate;
116 QImage imageForGlyph(glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform);
117 void collectMetrics();
119 IDWriteFontFace *m_directWriteFontFace;
120 IDWriteFactory *m_directWriteFactory;
121 IDWriteBitmapRenderTarget *m_directWriteBitmapRenderTarget;
123 QFixed m_lineThickness;
134 #endif // QT_NO_DIRECTWRITE
136 #endif // QFONTENGINEDIRECTWRITE_H