summaryrefslogtreecommitdiffstats
path: root/src/gui/text/qfontengine_ft_p.h
blob: b30076c4b9d716c31513da03e95176338e36a598 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QFONTENGINE_FT_P_H
#define QFONTENGINE_FT_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 "qfontengine_p.h"

#ifndef QT_NO_FREETYPE

#include <ft2build.h>
#include FT_FREETYPE_H

#if defined(Q_WS_X11)
#include <private/qt_x11_p.h>
#endif

#include <unistd.h>

#ifndef QT_NO_FONTCONFIG
#include <fontconfig/fontconfig.h>
#endif

#include <qmutex.h>

#include <harfbuzz-shaper.h>

QT_BEGIN_NAMESPACE

class QFontEngineFTRawFont;

/*
 * This struct represents one font file on disk (like Arial.ttf) and is shared between all the font engines
 * that show this font file (at different pixel sizes).
 */
struct QFreetypeFace
{
    void computeSize(const QFontDef &fontDef, int *xsize, int *ysize, bool *outline_drawing);
    QFontEngine::Properties properties() const;
    bool getSfntTable(uint tag, uchar *buffer, uint *length) const;

    static QFreetypeFace *getFace(const QFontEngine::FaceId &face_id,
                                  const QByteArray &fontData = QByteArray());
    void release(const QFontEngine::FaceId &face_id);

    // locks the struct for usage. Any read/write operations require locking.
    void lock()
    {
        _lock.lock();
    }
    void unlock()
    {
        _lock.unlock();
    }

    FT_Face face;
    HB_Face hbFace;
#ifndef QT_NO_FONTCONFIG
    FcCharSet *charset;
#endif
    int xsize; // 26.6
    int ysize; // 26.6
    FT_Matrix matrix;
    FT_CharMap unicode_map;
    FT_CharMap symbol_map;

    enum { cmapCacheSize = 0x200 };
    glyph_t cmapCache[cmapCacheSize];

    int fsType() const;

    HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);

    static void addGlyphToPath(FT_Face face, FT_GlyphSlot g, const QFixedPoint &point, QPainterPath *path, FT_Fixed x_scale, FT_Fixed y_scale);
    static void addBitmapToPath(FT_GlyphSlot slot, const QFixedPoint &point, QPainterPath *path, bool = false);

private:
    friend class QFontEngineFT;
    friend class QScopedPointerDeleter<QFreetypeFace>;
    QFreetypeFace() : _lock(QMutex::Recursive) {}
    ~QFreetypeFace() {}
    QAtomicInt ref;
    QMutex _lock;
    QByteArray fontData;
};

class Q_GUI_EXPORT QFontEngineFT : public QFontEngine
{
public:

    /* we don't cache glyphs that are too large anyway, so we can make this struct rather small */
    struct Glyph {
        ~Glyph();
        short linearAdvance;
        unsigned char width;
        unsigned char height;
        signed char x;
        signed char y;
        signed char advance;
        signed char format;
        uchar *data;
        unsigned int uploadedToServer : 1;
    };

    enum SubpixelAntialiasingType {
        Subpixel_None,
        Subpixel_RGB,
        Subpixel_BGR,
        Subpixel_VRGB,
        Subpixel_VBGR
    };

#if defined(Q_WS_X11) && !defined(QT_NO_XRENDER)
    typedef XGlyphInfo GlyphInfo;
#else
    struct GlyphInfo {
        unsigned short  width;
        unsigned short  height;
        short           x;
        short           y;
        short           xOff;
        short           yOff;
    };
#endif

    struct GlyphAndSubPixelPosition
    {
        GlyphAndSubPixelPosition(glyph_t g, QFixed spp) : glyph(g), subPixelPosition(spp) {}

        bool operator==(const GlyphAndSubPixelPosition &other) const
        {
            return glyph == other.glyph && subPixelPosition == other.subPixelPosition;
        }

        glyph_t glyph;
        QFixed subPixelPosition;
    };

    struct QGlyphSet
    {
        QGlyphSet();
        ~QGlyphSet();
        FT_Matrix transformationMatrix;
        unsigned long id; // server sided id, GlyphSet for X11
        bool outline_drawing;

        void removeGlyphFromCache(glyph_t index, QFixed subPixelPosition);
        void clear();
        inline bool useFastGlyphData(glyph_t index, QFixed subPixelPosition) const {
            return (index < 256 && subPixelPosition == 0);
        }
        inline Glyph *getGlyph(glyph_t index, QFixed subPixelPosition = 0) const;
        void setGlyph(glyph_t index, QFixed spp, Glyph *glyph);

private:
        mutable QHash<GlyphAndSubPixelPosition, Glyph *> glyph_data; // maps from glyph index to glyph data
        mutable Glyph *fast_glyph_data[256]; // for fast lookup of glyphs < 256
        mutable int fast_glyph_count;
    };

    virtual QFontEngine::FaceId faceId() const;
    virtual QFontEngine::Properties properties() const;
    virtual QFixed emSquareSize() const;
    virtual bool supportsSubPixelPositions() const
    {
        return default_hint_style == HintLight ||
               default_hint_style == HintNone;
    }

    virtual bool getSfntTableData(uint tag, uchar *buffer, uint *length) const;
    virtual int synthesized() const;

    virtual QFixed ascent() const;
    virtual QFixed descent() const;
    virtual QFixed leading() const;
    virtual QFixed xHeight() const;
    virtual QFixed averageCharWidth() const;

    virtual qreal maxCharWidth() const;
    virtual qreal minLeftBearing() const;
    virtual qreal minRightBearing() const;
    virtual QFixed lineThickness() const;
    virtual QFixed underlinePosition() const;

    void doKerning(QGlyphLayout *, QTextEngine::ShaperFlags) const;

    inline virtual Type type() const
    { return QFontEngine::Freetype; }
    inline virtual const char *name() const
    { return "freetype"; }

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

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

    virtual void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
                         QPainterPath *path, QTextItem::RenderFlags flags);
    virtual void addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs,
                          QPainterPath *path, QTextItem::RenderFlags flags);

    virtual bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs,
                      QTextEngine::ShaperFlags flags) const;

    virtual glyph_metrics_t boundingBox(const QGlyphLayout &glyphs);
    virtual glyph_metrics_t boundingBox(glyph_t glyph);
    virtual glyph_metrics_t boundingBox(glyph_t glyph, const QTransform &matrix);

    virtual void recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const;
    virtual QImage alphaMapForGlyph(glyph_t g) { return alphaMapForGlyph(g, 0); }
    virtual QImage alphaMapForGlyph(glyph_t, QFixed);
    virtual QImage alphaRGBMapForGlyph(glyph_t, QFixed subPixelPosition, int margin, const QTransform &t);
    virtual glyph_metrics_t alphaMapBoundingBox(glyph_t glyph,
                                                QFixed subPixelPosition,
                                                const QTransform &matrix,
                                                QFontEngine::GlyphFormat format);
    virtual void removeGlyphFromCache(glyph_t glyph);

    virtual int glyphCount() const;

    enum Scaling {
        Scaled,
        Unscaled
    };
    FT_Face lockFace(Scaling scale = Scaled) const;
    void unlockFace() const;

    FT_Face non_locked_face() const;

    inline bool drawAntialiased() const { return antialias; }
    inline bool invalid() const { return xsize == 0 && ysize == 0; }
    inline bool isBitmapFont() const { return defaultFormat == Format_Mono; }

    inline Glyph *loadGlyph(uint glyph, QFixed subPixelPosition, GlyphFormat format = Format_None, bool fetchMetricsOnly = false) const
    { return loadGlyph(&defaultGlyphSet, glyph, subPixelPosition, format, fetchMetricsOnly); }
    Glyph *loadGlyph(QGlyphSet *set, uint glyph, QFixed subPixelPosition, GlyphFormat = Format_None, bool fetchMetricsOnly = false) const;

    QGlyphSet *defaultGlyphs() { return &defaultGlyphSet; }
    GlyphFormat defaultGlyphFormat() const { return defaultFormat; }

    inline Glyph *cachedGlyph(glyph_t g) const { return defaultGlyphSet.getGlyph(g, 0); }

    QGlyphSet *loadTransformedGlyphSet(const QTransform &matrix);
    QFixed subPixelPositionForX(QFixed x);
    bool loadGlyphs(QGlyphSet *gs, const glyph_t *glyphs, int num_glyphs,
                    const QFixedPoint *positions,
                    GlyphFormat format = Format_Render);

#if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)
    virtual void draw(QPaintEngine * /*p*/, qreal /*x*/, qreal /*y*/, const QTextItemInt & /*si*/) {}
#endif

    QFontEngineFT(const QFontDef &fd);
    virtual ~QFontEngineFT();

    bool init(FaceId faceId, bool antiaalias, GlyphFormat defaultFormat = Format_None,
              const QByteArray &fontData = QByteArray());
    bool init(FaceId faceId, bool antialias, GlyphFormat format,
              QFreetypeFace *freetypeFace);

    virtual HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);

    enum HintStyle {
        HintNone,
        HintLight,
        HintMedium,
        HintFull
    };

    void setDefaultHintStyle(HintStyle style);

    virtual QFontEngine *cloneWithSize(qreal pixelSize) const;
    bool initFromFontEngine(const QFontEngineFT *fontEngine);

    HintStyle defaultHintStyle() const { return default_hint_style; }
protected:

    void freeGlyphSets();

    virtual bool uploadGlyphToServer(QGlyphSet *set, uint glyphid, Glyph *g, GlyphInfo *info, int glyphDataSize) const;
    virtual unsigned long allocateServerGlyphSet();
    virtual void freeServerGlyphSet(unsigned long id);

    QFreetypeFace *freetype;
    int default_load_flags;


    HintStyle default_hint_style;

    bool antialias;
    bool transform;
    bool embolden;
    SubpixelAntialiasingType subpixelType;
    int lcdFilterType;
    bool canUploadGlyphsToServer;
    bool embeddedbitmap;

private:
    friend class QFontEngineFTRawFont;

    int loadFlags(QGlyphSet *set, GlyphFormat format, int flags, bool &hsubpixel, int &vfactor) const;

    GlyphFormat defaultFormat;
    FT_Matrix matrix;

    QList<QGlyphSet> transformedGlyphSets;
    mutable QGlyphSet defaultGlyphSet;

    QFontEngine::FaceId face_id;

    int xsize;
    int ysize;

    mutable QFixed lbearing;
    mutable QFixed rbearing;
    QFixed line_thickness;
    QFixed underline_position;

    FT_Size_Metrics metrics;
    mutable bool kerning_pairs_loaded;
};

inline uint qHash(const QFontEngineFT::GlyphAndSubPixelPosition &g)
{
    return (g.glyph << 8)  | (g.subPixelPosition * 10).round().toInt();
}

inline QFontEngineFT::Glyph *QFontEngineFT::QGlyphSet::getGlyph(glyph_t index, QFixed subPixelPosition) const
{
    if (useFastGlyphData(index, subPixelPosition))
        return fast_glyph_data[index];
    return glyph_data.value(GlyphAndSubPixelPosition(index, subPixelPosition));
}


QT_END_NAMESPACE

#endif // QT_NO_FREETYPE

#endif // QFONTENGINE_FT_P_H