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41 
42 #ifndef QFONTENGINEDIRECTWRITE_H
43 #define QFONTENGINEDIRECTWRITE_H
44 
45 #ifndef QT_NO_DIRECTWRITE
46 
47 //
48 //  W A R N I N G
49 //  -------------
50 //
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.
54 //
55 // We mean it.
56 //
57 
58 #include "private/qfontengine_p.h"
59 
60 struct IDWriteFont ;
61 struct IDWriteFontFace ;
62 struct IDWriteFactory ;
63 struct IDWriteBitmapRenderTarget ;
64 struct IDWriteGdiInterop ;
65 
66 QT_BEGIN_NAMESPACE
67 
68 class QFontEngineDirectWrite : public QFontEngine
69 {
70     Q_OBJECT
71 public:
72     explicit QFontEngineDirectWrite(IDWriteFactory *directWriteFactory,
73                                     IDWriteFontFace *directWriteFontFace,
74                                     qreal pixelSize);
75     ~QFontEngineDirectWrite();
76 
77     QFixed lineThickness() const;
78     bool getSfntTableData(uint tag, uchar *buffer, uint *length) const;
79     QFixed emSquareSize() const;
80 
81     bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const;
82     void recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const;
83 
84     void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
85                          QPainterPath *path, QTextItem::RenderFlags flags);
86 
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,
92                                         GlyphFormat format);
93 
94     QFixed ascent() const;
95     QFixed descent() const;
96     QFixed leading() const;
97     QFixed xHeight() const;
98     qreal maxCharWidth() const;
99 
100     const char *name() const;
101 
102     bool supportsSubPixelPositions() const;
103 
104     QImage alphaMapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform &t);
105     QImage alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, int margin,
106                                const QTransform &xform);
107 
108     QFontEngine *cloneWithSize(qreal pixelSize) const;
109 
110     bool canRender(const QChar *string, int len);
111     Type type() const;
112 
113 private:
114     friend class QRawFontPrivate;
115 
116     QImage imageForGlyph(glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform);
117     void collectMetrics();
118 
119     IDWriteFontFace *m_directWriteFontFace;
120     IDWriteFactory *m_directWriteFactory;
121     IDWriteBitmapRenderTarget *m_directWriteBitmapRenderTarget;
122 
123     QFixed m_lineThickness;
124     int m_unitsPerEm;
125     QFixed m_ascent;
126     QFixed m_descent;
127     QFixed m_xHeight;
128     QFixed m_lineGap;
129     FaceId m_faceId;
130 };
131 
132 QT_END_NAMESPACE
133 
134 #endif // QT_NO_DIRECTWRITE
135 
136 #endif // QFONTENGINEDIRECTWRITE_H
137