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39
40#ifndef QFONT_P_H
41#define QFONT_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of internal files. This header file may change from version to version
49// without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/private/qtguiglobal_p.h>
55#include "QtGui/qfont.h"
56#include "QtCore/qmap.h"
57#include "QtCore/qhash.h"
58#include "QtCore/qobject.h"
59#include "QtCore/qstringlist.h"
60#include <QtGui/qfontdatabase.h>
61#include "private/qfixed_p.h"
62
63QT_BEGIN_NAMESPACE
64
65// forwards
66class QFontCache;
67class QFontEngine;
68
69struct QFontDef
70{
71 inline QFontDef()
72 : pointSize(-1.0), pixelSize(-1),
73 styleStrategy(QFont::PreferDefault), styleHint(QFont::AnyStyle),
74 weight(50), fixedPitch(false), style(QFont::StyleNormal), stretch(QFont::AnyStretch),
75 hintingPreference(QFont::PreferDefaultHinting), ignorePitch(true),
76 fixedPitchComputed(0), reserved(0)
77 {
78 }
79
80 QString family;
81 QStringList families;
82 QString styleName;
83
84 QStringList fallBackFamilies;
85
86 qreal pointSize;
87 qreal pixelSize;
88
89 uint styleStrategy : 16;
90 uint styleHint : 8;
91
92 uint weight : 7; // 0-99
93 uint fixedPitch : 1;
94 uint style : 2;
95 uint stretch : 12; // 0-4000
96
97 uint hintingPreference : 2;
98 uint ignorePitch : 1;
99 uint fixedPitchComputed : 1; // for Mac OS X only
100 uint reserved : 14; // for future extensions
101
102 bool exactMatch(const QFontDef &other) const;
103 bool operator==(const QFontDef &other) const
104 {
105 return pixelSize == other.pixelSize
106 && weight == other.weight
107 && style == other.style
108 && stretch == other.stretch
109 && styleHint == other.styleHint
110 && styleStrategy == other.styleStrategy
111 && ignorePitch == other.ignorePitch && fixedPitch == other.fixedPitch
112 && family == other.family
113 && families == other.families
114 && styleName == other.styleName
115 && hintingPreference == other.hintingPreference
116 ;
117 }
118 inline bool operator<(const QFontDef &other) const
119 {
120 if (pixelSize != other.pixelSize) return pixelSize < other.pixelSize;
121 if (weight != other.weight) return weight < other.weight;
122 if (style != other.style) return style < other.style;
123 if (stretch != other.stretch) return stretch < other.stretch;
124 if (styleHint != other.styleHint) return styleHint < other.styleHint;
125 if (styleStrategy != other.styleStrategy) return styleStrategy < other.styleStrategy;
126 if (family != other.family) return family < other.family;
127 if (families != other.families) return families < other.families;
128 if (styleName != other.styleName)
129 return styleName < other.styleName;
130 if (hintingPreference != other.hintingPreference) return hintingPreference < other.hintingPreference;
131
132
133 if (ignorePitch != other.ignorePitch) return ignorePitch < other.ignorePitch;
134 if (fixedPitch != other.fixedPitch) return fixedPitch < other.fixedPitch;
135 return false;
136 }
137};
138
139inline uint qHash(const QFontDef &fd, uint seed = 0) noexcept
140{
141 QtPrivate::QHashCombine hash;
142 seed = hash(seed, qRound64(fd.pixelSize*10000)); // use only 4 fractional digits
143 seed = hash(seed, fd.weight);
144 seed = hash(seed, fd.style);
145 seed = hash(seed, fd.stretch);
146 seed = hash(seed, fd.styleHint);
147 seed = hash(seed, fd.styleStrategy);
148 seed = hash(seed, fd.ignorePitch);
149 seed = hash(seed, fd.fixedPitch);
150 seed = hash(seed, fd.family);
151 seed = hash(seed, fd.families);
152 seed = hash(seed, fd.styleName);
153 seed = hash(seed, fd.hintingPreference);
154 return seed;
155}
156
157class QFontEngineData
158{
159public:
160 QFontEngineData();
161 ~QFontEngineData();
162
163 QAtomicInt ref;
164 const int fontCacheId;
165
166 QFontEngine *engines[QChar::ScriptCount];
167
168private:
169 Q_DISABLE_COPY_MOVE(QFontEngineData)
170};
171
172
173class Q_GUI_EXPORT QFontPrivate
174{
175public:
176
177 QFontPrivate();
178 QFontPrivate(const QFontPrivate &other);
179 ~QFontPrivate();
180
181 QFontEngine *engineForScript(int script) const;
182 void alterCharForCapitalization(QChar &c) const;
183
184 QAtomicInt ref;
185 QFontDef request;
186 mutable QFontEngineData *engineData;
187 int dpi;
188
189 uint underline : 1;
190 uint overline : 1;
191 uint strikeOut : 1;
192 uint kerning : 1;
193 uint capital : 3;
194 bool letterSpacingIsAbsolute : 1;
195
196 QFixed letterSpacing;
197 QFixed wordSpacing;
198
199 mutable QFontPrivate *scFont;
200 QFont smallCapsFont() const { return QFont(smallCapsFontPrivate()); }
201 QFontPrivate *smallCapsFontPrivate() const;
202
203 static QFontPrivate *get(const QFont &font)
204 {
205 return font.d.data();
206 }
207
208 void resolve(uint mask, const QFontPrivate *other);
209
210 static void detachButKeepEngineData(QFont *font);
211
212private:
213 QFontPrivate &operator=(const QFontPrivate &) { return *this; }
214};
215
216
217class Q_GUI_EXPORT QFontCache : public QObject
218{
219public:
220 // note: these static functions work on a per-thread basis
221 static QFontCache *instance();
222 static void cleanup();
223
224 QFontCache();
225 ~QFontCache();
226
227 int id() const { return m_id; }
228
229 void clear();
230
231 struct Key {
232 Key() : script(0), multi(0) { }
233 Key(const QFontDef &d, uchar c, bool m = 0)
234 : def(d), script(c), multi(m) { }
235
236 QFontDef def;
237 uchar script;
238 uchar multi: 1;
239
240 inline bool operator<(const Key &other) const
241 {
242 if (script != other.script) return script < other.script;
243 if (multi != other.multi) return multi < other.multi;
244 if (multi && def.fallBackFamilies.size() != other.def.fallBackFamilies.size())
245 return def.fallBackFamilies.size() < other.def.fallBackFamilies.size();
246 return def < other.def;
247 }
248 inline bool operator==(const Key &other) const
249 {
250 return script == other.script
251 && multi == other.multi
252 && (!multi || def.fallBackFamilies == other.def.fallBackFamilies)
253 && def == other.def;
254 }
255 };
256
257 // QFontEngineData cache
258 typedef QMap<QFontDef, QFontEngineData*> EngineDataCache;
259 EngineDataCache engineDataCache;
260
261 QFontEngineData *findEngineData(const QFontDef &def) const;
262 void insertEngineData(const QFontDef &def, QFontEngineData *engineData);
263
264 // QFontEngine cache
265 struct Engine {
266 Engine() : data(nullptr), timestamp(0), hits(0) { }
267 Engine(QFontEngine *d) : data(d), timestamp(0), hits(0) { }
268
269 QFontEngine *data;
270 uint timestamp;
271 uint hits;
272 };
273
274 typedef QMultiMap<Key,Engine> EngineCache;
275 EngineCache engineCache;
276 QHash<QFontEngine *, int> engineCacheCount;
277
278 QFontEngine *findEngine(const Key &key);
279
280 void updateHitCountAndTimeStamp(Engine &value);
281 void insertEngine(const Key &key, QFontEngine *engine, bool insertMulti = false);
282
283private:
284 void increaseCost(uint cost);
285 void decreaseCost(uint cost);
286 void timerEvent(QTimerEvent *event) override;
287 void decreaseCache();
288
289 static const uint min_cost;
290 uint total_cost, max_cost;
291 uint current_timestamp;
292 bool fast;
293 int timer_id;
294 const int m_id;
295};
296
297Q_GUI_EXPORT int qt_defaultDpiX();
298Q_GUI_EXPORT int qt_defaultDpiY();
299Q_GUI_EXPORT int qt_defaultDpi();
300
301QT_END_NAMESPACE
302
303#endif // QFONT_P_H
304

source code of qtbase/src/gui/text/qfont_p.h