src/gui/text/qfontdatabase_qpa.cpp

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
   4 ** All rights reserved.
   5 ** Contact: Nokia Corporation (qt-info@nokia.com)
   6 **
   7 ** This file is part of the QtGui module of the Qt Toolkit.
   8 **
   9 ** $QT_BEGIN_LICENSE:LGPL$
  10 ** GNU Lesser General Public License Usage
  11 ** This file may be used under the terms of the GNU Lesser General Public
  12 ** License version 2.1 as published by the Free Software Foundation and
  13 ** appearing in the file LICENSE.LGPL included in the packaging of this
  14 ** file. Please review the following information to ensure the GNU Lesser
  15 ** General Public License version 2.1 requirements will be met:
  16 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  17 **
  18 ** In addition, as a special exception, Nokia gives you certain additional
  19 ** rights. These rights are described in the Nokia Qt LGPL Exception
  20 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  21 **
  22 ** GNU General Public License Usage
  23 ** Alternatively, this file may be used under the terms of the GNU General
  24 ** Public License version 3.0 as published by the Free Software Foundation
  25 ** and appearing in the file LICENSE.GPL included in the packaging of this
  26 ** file. Please review the following information to ensure the GNU General
  27 ** Public License version 3.0 requirements will be met:
  28 ** http://www.gnu.org/copyleft/gpl.html.
  29 **
  30 ** Other Usage
  31 ** Alternatively, this file may be used in accordance with the terms and
  32 ** conditions contained in a signed written agreement between you and Nokia.
  33 **
  34 **
  35 **
  36 **
  37 **
  38 ** $QT_END_LICENSE$
  39 **
  40 ****************************************************************************/
  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/qapplication_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 = QApplicationPrivate::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         QApplicationPrivate::platformIntegration()->fontDatabase()->populateFontDatabase();
 113         initialized = true;
 114     }
 115 }
 116
 117 #ifndef QT_NO_SETTINGS
 118 // called from qapplication_qws.cpp
 119 void qt_applyFontDatabaseSettings(const QSettings &settings)
 120 {
 121     initializeDb();
 122     QFontDatabasePrivate *db = privateDb();
 123     for (int i = 0; i < db->count; ++i) {
 124         QtFontFamily *family = db->families[i];
 125         if (settings.contains(family->name))
 126             family->fallbackFamilies = settings.value(family->name).toStringList();
 127     }
 128
 129     if (settings.contains(QLatin1String("Global Fallbacks")))
 130         db->fallbackFamilies = settings.value(QLatin1String("Global Fallbacks")).toStringList();
 131 }
 132 #endif // QT_NO_SETTINGS
 133
 134 static inline void load(const QString & = QString(), int = -1)
 135 {
 136     initializeDb();
 137 }
 138
 139 static
 140 QFontEngine *loadSingleEngine(int script,
 141                               const QFontDef &request,
 142                               QtFontFoundry *foundry,
 143                               QtFontStyle *style, QtFontSize *size)
 144 {
 145     Q_UNUSED(foundry);
 146
 147     Q_ASSERT(size);
 148     int pixelSize = size->pixelSize;
 149     if (!pixelSize || (style->smoothScalable && pixelSize == SMOOTH_SCALABLE))
 150         pixelSize = request.pixelSize;
 151
 152     QFontDef def = request;
 153     def.pixelSize = pixelSize;
 154
 155     QFontCache::Key key(def,script);
 156     QFontEngine *engine = QFontCache::instance()->findEngine(key);
 157     if (!engine) {
 158         QPlatformFontDatabase *pfdb = QApplicationPrivate::platformIntegration()->fontDatabase();
 159         engine = pfdb->fontEngine(def,QUnicodeTables::Script(script),size->handle);
 160         if (engine) {
 161             QFontCache::Key key(def,script);
 162             QFontCache::instance()->instance()->insertEngine(key,engine);
 163         }
 164     }
 165     return engine;
 166 }
 167
 168 static
 169 QFontEngine *loadEngine(int script, const QFontDef &request,
 170                         QtFontFamily *family, QtFontFoundry *foundry,
 171                         QtFontStyle *style, QtFontSize *size)
 172 {
 173
 174     QFontEngine *engine = loadSingleEngine(script, request, foundry, style, size);
 175     //make sure that the db has all fallback families
 176     if (engine
 177         && !(request.styleStrategy & QFont::NoFontMerging) && !engine->symbol ) {
 178
 179         if (family && !family->askedForFallback) {
 180             QFont::Style fontStyle = QFont::Style(style->key.style);
 181             QFont::StyleHint styleHint = QFont::StyleHint(request.styleHint);
 182             if (styleHint == QFont::AnyStyle && request.fixedPitch)
 183                 styleHint = QFont::TypeWriter;
 184             family->fallbackFamilies = fallbackFamilies(family->name,fontStyle,styleHint,QUnicodeTables::Script(script));
 185
 186             family->askedForFallback = true;
 187         }
 188
 189         QStringList fallbacks = privateDb()->fallbackFamilies;
 190         if (family && !family->fallbackFamilies.isEmpty())
 191             fallbacks = family->fallbackFamilies;
 192
 193         engine = new QFontEngineMultiQPA(engine, script, fallbacks);
 194     }
 195
 196     return engine;
 197 }
 198
 199 static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
 200 {
 201     QFontDatabasePrivate *db = privateDb();
 202
 203     fnt->families = QApplicationPrivate::platformIntegration()->fontDatabase()->addApplicationFont(fnt->data,fnt->fileName);
 204
 205     db->reregisterAppFonts = true;
 206 }
 207
 208 bool QFontDatabase::removeApplicationFont(int handle)
 209 {
 210     QMutexLocker locker(fontDatabaseMutex());
 211
 212     QFontDatabasePrivate *db = privateDb();
 213     if (handle < 0 || handle >= db->applicationFonts.count())
 214         return false;
 215
 216     db->applicationFonts[handle] = QFontDatabasePrivate::ApplicationFont();
 217
 218     db->reregisterAppFonts = true;
 219     db->invalidate();
 220     return true;
 221 }
 222
 223 bool QFontDatabase::removeAllApplicationFonts()
 224 {
 225     QMutexLocker locker(fontDatabaseMutex());
 226
 227     QFontDatabasePrivate *db = privateDb();
 228     if (db->applicationFonts.isEmpty())
 229         return false;
 230
 231     db->applicationFonts.clear();
 232     db->invalidate();
 233     return true;
 234 }
 235
 236 bool QFontDatabase::supportsThreadedFontRendering()
 237 {
 238     return true;
 239 }
 240
 241 /*!
 242     \internal
 243 */
 244 QFontEngine *
 245 QFontDatabase::findFont(int script, const QFontPrivate *fp,
 246                         const QFontDef &request)
 247 {
 248     QMutexLocker locker(fontDatabaseMutex());
 249
 250     const int force_encoding_id = -1;
 251
 252     if (!privateDb()->count)
 253         initializeDb();
 254
 255     QFontEngine *engine;
 256     QFontCache::Key key(request, script);
 257     engine = QFontCache::instance()->findEngine(key);
 258     if (engine) {
 259         qDebug() << "Cache hit level 1";
 260         return engine;
 261     }
 262
 263     QString family_name, foundry_name;
 264
 265     parseFontName(request.family, foundry_name, family_name);
 266
 267     if (qt_enable_test_font && request.family == QLatin1String("__Qt__Box__Engine__")) {
 268         engine =new QTestFontEngine(request.pixelSize);
 269         engine->fontDef = request;
 270     }
 271
 272     QtFontDesc desc;
 273     match(script, request, family_name, foundry_name, force_encoding_id, &desc);
 274     if (desc.family != 0 && desc.foundry != 0 && desc.style != 0) {
 275         engine = loadEngine(script, request, desc.family, desc.foundry, desc.style, desc.size);
 276     } else {
 277         FM_DEBUG("  NO MATCH FOUND\n");
 278     }
 279
 280     if (engine) {
 281         initFontDef(desc, request, &engine->fontDef);
 282
 283         if (fp) {
 284             QFontDef def = request;
 285             if (def.family.isEmpty()) {
 286                 def.family = fp->request.family;
 287                 def.family = def.family.left(def.family.indexOf(QLatin1Char(',')));
 288             }
 289         }
 290     }
 291
 292     if (!engine) {
 293         if (!request.family.isEmpty()) {
 294             QStringList fallbacks = fallbackFamilies(request.family,QFont::Style(request.style),QFont::StyleHint(request.styleHint),QUnicodeTables::Script(script));
 295             for (int i = 0; i < fallbacks.size(); i++) {
 296                 QFontDef def = request;
 297                 def.family = fallbacks.at(i);
 298                 QFontCache::Key key(def,script);
 299                 engine = QFontCache::instance()->findEngine(key);
 300                 if (!engine) {
 301                     QtFontDesc desc;
 302                     match(script, def, def.family, QLatin1String(""), 0, &desc);
 303                     if (desc.family == 0 && desc.foundry == 0 && desc.style == 0) {
 304                         continue;
 305                     }
 306                     engine = loadEngine(script, def, desc.family, desc.foundry, desc.style, desc.size);
 307                     if (engine) {
 308                         initFontDef(desc, def, &engine->fontDef);
 309                         break;
 310                     }
 311                 }
 312             }
 313         }
 314
 315         if (!engine)
 316             engine = new QFontEngineBox(request.pixelSize);
 317
 318         FM_DEBUG("returning box engine");
 319     }
 320
 321     if (fp && fp->dpi > 0) {
 322         engine->fontDef.pointSize = qreal(double((engine->fontDef.pixelSize * 72) / fp->dpi));
 323     } else {
 324         engine->fontDef.pointSize = request.pointSize;
 325     }
 326
 327     return engine;
 328 }
 329
 330 void QFontDatabase::load(const QFontPrivate *d, int script)
 331 {
 332     QFontDef req = d->request;
 333
 334     if (req.pixelSize == -1) {
 335         req.pixelSize = floor(((req.pointSize * d->dpi) / 72) * 100 + 0.5) / 100;
 336         req.pixelSize = qRound(req.pixelSize);
 337     }
 338     if (req.pointSize < 0)
 339         req.pointSize = req.pixelSize*72.0/d->dpi;
 340     if (req.weight == 0)
 341         req.weight = QFont::Normal;
 342     if (req.stretch == 0)
 343         req.stretch = 100;
 344
 345     QFontCache::Key key(req, script);
 346
 347     if (!d->engineData)
 348         getEngineData(d, key);
 349
 350     // the cached engineData could have already loaded the engine we want
 351     if (d->engineData->engines[script])
 352         return;
 353
 354     QFontEngine *fe = QFontCache::instance()->findEngine(key);
 355
 356     // list of families to try
 357     QStringList family_list;
 358
 359     if (!req.family.isEmpty()) {
 360         family_list = familyList(req);
 361
 362         // add the default family
 363         QString defaultFamily = QApplication::font().family();
 364         if (! family_list.contains(defaultFamily))
 365             family_list << defaultFamily;
 366
 367     }
 368
 369     // null family means find the first font matching the specified script
 370     family_list << QString();
 371
 372     QStringList::ConstIterator it = family_list.constBegin(), end = family_list.constEnd();
 373     for (; !fe && it != end; ++it) {
 374         req.family = *it;
 375
 376         fe = QFontDatabase::findFont(script, d, req);
 377         if (fe && (fe->type()==QFontEngine::Box) && !req.family.isEmpty())
 378             fe = 0;
 379     }
 380
 381     if (fe->symbol || (d->request.styleStrategy & QFont::NoFontMerging)) {
 382         for (int i = 0; i < QUnicodeTables::ScriptCount; ++i) {
 383             if (!d->engineData->engines[i]) {
 384                 d->engineData->engines[i] = fe;
 385                 fe->ref.ref();
 386             }
 387         }
 388     } else {
 389         d->engineData->engines[script] = fe;
 390         fe->ref.ref();
 391     }
 392 }
 393
 394 QT_END_NAMESPACE