src/gui/text/qfontdatabase_qpa.cpp

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  41
  42 #include "qlibraryinfo.h"
  43 #include <QtCore/qsettings.h>
  44
  45 #include "qfontengine_qpa_p.h"
  46 #include "qplatformdefs.h"
  47
  48 #include <QtGui/private/qguiapplication_p.h>
  49 #include <QtGui/qplatformfontdatabase_qpa.h>
  50
  51 #include <QtCore/qmath.h>
  52
  53 QT_BEGIN_NAMESPACE
  54
  55 Q_GUI_EXPORT  void qt_registerFont(const QString &familyName, const QString &foundryname, int weight,
  56                                    QFont::Style style, int stretch, bool antialiased, bool scalable, int pixelSize,
  57                                    const QSupportedWritingSystems &writingSystems, void *handle)
  58 {
  59     QFontDatabasePrivate *d = privateDb();
  60     //    qDebug() << "Adding font" << familyname << weight << italic << pixelSize << file << fileIndex << antialiased;
  61         QtFontStyle::Key styleKey;
  62         styleKey.style = style;
  63         styleKey.weight = weight;
  64         styleKey.stretch = stretch;
  65         QtFontFamily *f = d->family(familyName, true);
  66
  67         for (int i = 0; i < QFontDatabase::WritingSystemsCount; ++i) {
  68             if (writingSystems.supported(QFontDatabase::WritingSystem(i))) {
  69                 f->writingSystems[i] = QtFontFamily::Supported;
  70             } else {
  71                 f->writingSystems[i] = QtFontFamily::Unsupported;
  72             }
  73         }
  74
  75         QtFontFoundry *foundry = f->foundry(foundryname, true);
  76         QtFontStyle *fontStyle = foundry->style(styleKey, QString(), true);
  77         fontStyle->smoothScalable = scalable;
  78         fontStyle->antialiased = antialiased;
  79         QtFontSize *size = fontStyle->pixelSize(pixelSize?pixelSize:SMOOTH_SCALABLE, true);
  80         size->handle = handle;
  81 }
  82
  83 static QStringList fallbackFamilies(const QString &family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script)
  84 {
  85     QStringList retList = QGuiApplicationPrivate::platformIntegration()->fontDatabase()->fallbacksForFamily(family,style,styleHint,script);
  86     QFontDatabasePrivate *db = privateDb();
  87
  88     QStringList::iterator i;
  89     for (i = retList.begin(); i != retList.end(); ++i) {
  90         bool contains = false;
  91         for (int j = 0; j < db->count; j++) {
  92             QtFontFamily *qtFamily = db->families[j];
  93             if (!(i->compare(qtFamily->name,Qt::CaseInsensitive))) {
  94                 contains = true;
  95                 break;
  96             }
  97         }
  98         if (!contains) {
  99             i = retList.erase(i);
 100             i--;
 101         }
 102     }
 103     return retList;
 104 }
 105
 106 static void initializeDb()
 107 {
 108     static int initialized = false;
 109
 110     if (!initialized) {
 111         //init by asking for the platformfontdb for the first time :)
 112         QGuiApplicationPrivate::platformIntegration()->fontDatabase()->populateFontDatabase();
 113         initialized = true;
 114     }
 115 }
 116
 117 static inline void load(const QString & = QString(), int = -1)
 118 {
 119     initializeDb();
 120 }
 121
 122 static
 123 QFontEngine *loadSingleEngine(int script,
 124                               const QFontDef &request,
 125                               QtFontFoundry *foundry,
 126                               QtFontStyle *style, QtFontSize *size)
 127 {
 128     Q_UNUSED(foundry);
 129
 130     Q_ASSERT(size);
 131     int pixelSize = size->pixelSize;
 132     if (!pixelSize || (style->smoothScalable && pixelSize == SMOOTH_SCALABLE))
 133         pixelSize = request.pixelSize;
 134
 135     QFontDef def = request;
 136     def.pixelSize = pixelSize;
 137
 138     QFontCache::Key key(def,script);
 139     QFontEngine *engine = QFontCache::instance()->findEngine(key);
 140     if (!engine) {
 141         QPlatformFontDatabase *pfdb = QGuiApplicationPrivate::platformIntegration()->fontDatabase();
 142         engine = pfdb->fontEngine(def,QUnicodeTables::Script(script),size->handle);
 143         if (engine) {
 144             QFontCache::Key key(def,script);
 145             QFontCache::instance()->instance()->insertEngine(key,engine);
 146         }
 147     }
 148     return engine;
 149 }
 150
 151 static
 152 QFontEngine *loadEngine(int script, const QFontDef &request,
 153                         QtFontFamily *family, QtFontFoundry *foundry,
 154                         QtFontStyle *style, QtFontSize *size)
 155 {
 156
 157     QFontEngine *engine = loadSingleEngine(script, request, foundry, style, size);
 158     //make sure that the db has all fallback families
 159     if (engine && engine->type() != QFontEngine::Multi
 160         && !(request.styleStrategy & QFont::NoFontMerging) && !engine->symbol ) {
 161
 162         if (family && !family->askedForFallback) {
 163             QFont::Style fontStyle = QFont::Style(style->key.style);
 164             QFont::StyleHint styleHint = QFont::StyleHint(request.styleHint);
 165             if (styleHint == QFont::AnyStyle && request.fixedPitch)
 166                 styleHint = QFont::TypeWriter;
 167             family->fallbackFamilies = fallbackFamilies(family->name,fontStyle,styleHint,QUnicodeTables::Script(script));
 168
 169             family->askedForFallback = true;
 170         }
 171
 172         QStringList fallbacks = privateDb()->fallbackFamilies;
 173         if (family && !family->fallbackFamilies.isEmpty())
 174             fallbacks = family->fallbackFamilies;
 175
 176         engine = new QFontEngineMultiQPA(engine, script, fallbacks);
 177     }
 178
 179     return engine;
 180 }
 181
 182 static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
 183 {
 184     QFontDatabasePrivate *db = privateDb();
 185
 186     fnt->families = QGuiApplicationPrivate::platformIntegration()->fontDatabase()->addApplicationFont(fnt->data,fnt->fileName);
 187
 188     db->reregisterAppFonts = true;
 189 }
 190
 191 bool QFontDatabase::removeApplicationFont(int handle)
 192 {
 193     QMutexLocker locker(fontDatabaseMutex());
 194
 195     QFontDatabasePrivate *db = privateDb();
 196     if (handle < 0 || handle >= db->applicationFonts.count())
 197         return false;
 198
 199     db->applicationFonts[handle] = QFontDatabasePrivate::ApplicationFont();
 200
 201     db->reregisterAppFonts = true;
 202     db->invalidate();
 203     return true;
 204 }
 205
 206 bool QFontDatabase::removeAllApplicationFonts()
 207 {
 208     QMutexLocker locker(fontDatabaseMutex());
 209
 210     QFontDatabasePrivate *db = privateDb();
 211     if (db->applicationFonts.isEmpty())
 212         return false;
 213
 214     db->applicationFonts.clear();
 215     db->invalidate();
 216     return true;
 217 }
 218
 219 bool QFontDatabase::supportsThreadedFontRendering()
 220 {
 221     return true;
 222 }
 223
 224 /*!
 225     \internal
 226 */
 227 QFontEngine *
 228 QFontDatabase::findFont(int script, const QFontPrivate *fp,
 229                         const QFontDef &request)
 230 {
 231     QMutexLocker locker(fontDatabaseMutex());
 232
 233     const int force_encoding_id = -1;
 234
 235     if (!privateDb()->count)
 236         initializeDb();
 237
 238     QFontEngine *engine;
 239     QFontCache::Key key(request, script);
 240     engine = QFontCache::instance()->findEngine(key);
 241     if (engine) {
 242         qDebug() << "Cache hit level 1";
 243         return engine;
 244     }
 245
 246     QString family_name, foundry_name;
 247
 248     parseFontName(request.family, foundry_name, family_name);
 249
 250     if (qt_enable_test_font && request.family == QLatin1String("__Qt__Box__Engine__")) {
 251         engine =new QTestFontEngine(request.pixelSize);
 252         engine->fontDef = request;
 253     }
 254
 255     QtFontDesc desc;
 256     match(script, request, family_name, foundry_name, force_encoding_id, &desc);
 257     if (desc.family != 0 && desc.foundry != 0 && desc.style != 0) {
 258         engine = loadEngine(script, request, desc.family, desc.foundry, desc.style, desc.size);
 259     } else {
 260         FM_DEBUG("  NO MATCH FOUND\n");
 261     }
 262
 263     if (engine && engine->type() != QFontEngine::TestFontEngine) {
 264         initFontDef(desc, request, &engine->fontDef);
 265
 266         if (fp) {
 267             QFontDef def = request;
 268             if (def.family.isEmpty()) {
 269                 def.family = fp->request.family;
 270                 def.family = def.family.left(def.family.indexOf(QLatin1Char(',')));
 271             }
 272         }
 273     }
 274
 275     if (!engine) {
 276         if (!request.family.isEmpty()) {
 277             QStringList fallbacks = fallbackFamilies(request.family,QFont::Style(request.style),QFont::StyleHint(request.styleHint),QUnicodeTables::Script(script));
 278             for (int i = 0; !engine && i < fallbacks.size(); i++) {
 279                 QFontDef def = request;
 280                 def.family = fallbacks.at(i);
 281                 QFontCache::Key key(def,script);
 282                 engine = QFontCache::instance()->findEngine(key);
 283                 if (!engine) {
 284                     QtFontDesc desc;
 285                     match(script, def, def.family, QLatin1String(""), 0, &desc);
 286                     if (desc.family == 0 && desc.foundry == 0 && desc.style == 0) {
 287                         continue;
 288                     }
 289                     engine = loadEngine(script, def, desc.family, desc.foundry, desc.style, desc.size);
 290                     if (engine) {
 291                         initFontDef(desc, def, &engine->fontDef);
 292                     }
 293                 }
 294             }
 295         }
 296
 297         if (!engine)
 298             engine = new QFontEngineBox(request.pixelSize);
 299
 300         FM_DEBUG("returning box engine");
 301     }
 302
 303     if (fp && fp->dpi > 0) {
 304         engine->fontDef.pointSize = qreal(double((engine->fontDef.pixelSize * 72) / fp->dpi));
 305     } else {
 306         engine->fontDef.pointSize = request.pointSize;
 307     }
 308
 309     return engine;
 310 }
 311
 312 void QFontDatabase::load(const QFontPrivate *d, int script)
 313 {
 314     QFontDef req = d->request;
 315
 316     if (req.pixelSize == -1) {
 317         req.pixelSize = floor(((req.pointSize * d->dpi) / 72) * 100 + 0.5) / 100;
 318         req.pixelSize = qRound(req.pixelSize);
 319     }
 320     if (req.pointSize < 0)
 321         req.pointSize = req.pixelSize*72.0/d->dpi;
 322     if (req.weight == 0)
 323         req.weight = QFont::Normal;
 324     if (req.stretch == 0)
 325         req.stretch = 100;
 326
 327     QFontCache::Key key(req, script);
 328
 329     if (!d->engineData)
 330         getEngineData(d, key);
 331
 332     // the cached engineData could have already loaded the engine we want
 333     if (d->engineData->engines[script])
 334         return;
 335
 336     QFontEngine *fe = QFontCache::instance()->findEngine(key);
 337
 338     // list of families to try
 339     QStringList family_list;
 340
 341     if (!req.family.isEmpty()) {
 342         family_list = familyList(req);
 343
 344         // add the default family
 345         QString defaultFamily = QGuiApplication::font().family();
 346         if (! family_list.contains(defaultFamily))
 347             family_list << defaultFamily;
 348
 349     }
 350
 351     // null family means find the first font matching the specified script
 352     family_list << QString();
 353
 354     QStringList::ConstIterator it = family_list.constBegin(), end = family_list.constEnd();
 355     for (; !fe && it != end; ++it) {
 356         req.family = *it;
 357
 358         fe = QFontDatabase::findFont(script, d, req);
 359         if (fe && (fe->type()==QFontEngine::Box) && !req.family.isEmpty())
 360             fe = 0;
 361     }
 362
 363     if (fe->symbol || (d->request.styleStrategy & QFont::NoFontMerging)) {
 364         for (int i = 0; i < QUnicodeTables::ScriptCount; ++i) {
 365             if (!d->engineData->engines[i]) {
 366                 d->engineData->engines[i] = fe;
 367                 fe->ref.ref();
 368             }
 369         }
 370     } else {
 371         d->engineData->engines[script] = fe;
 372         fe->ref.ref();
 373     }
 374 }
 375
 376 QT_END_NAMESPACE