qfontdatabase_x11.cpp

奇趣公司比较新的qt/emd版本

    // add properties back in as the font selected from the
    // list doesn't contain them.
    qt_addPatternProps(pattern, screen, script, request);

    FcConfigSubstitute(0, pattern, FcMatchPattern);
    FcDefaultSubstitute(pattern);
    FcResult res;
    FcPattern *match = FcFontMatch(0, pattern, &res);
    QFontEngineX11FT *engine = 0;

    if (script != QUnicodeTables::Common) {
        // skip font if it doesn't support the language we want
        if (specialChars[script]) {
            // need to check the charset, as the langset doesn't work for these scripts
            FcCharSet *cs;
            if (FcPatternGetCharSet(match, FC_CHARSET, 0, &cs) != FcResultMatch)
                goto done;
            if (!FcCharSetHasChar(cs, specialChars[script]))
                goto done;
        } else {
            FcLangSet *langSet = 0;
            if (FcPatternGetLangSet(match, FC_LANG, 0, &langSet) != FcResultMatch)
                goto done;
            if (FcLangSetHasLang(langSet, (const FcChar8*)specialLanguages[script]) != FcLangEqual)
                goto done;
        }
    }

    // enforce non-antialiasing if requested. the ft font engine looks at this property.
    if (request.styleStrategy & QFont::NoAntialias) {
        FcPatternDel(match, FC_ANTIALIAS);
        FcPatternAddBool(match, FC_ANTIALIAS, false);
    }

    engine = new QFontEngineX11FT(match, qt_FcPatternToQFontDef(match, request), screen);
    if (engine->invalid()) {
        FM_DEBUG("   --> invalid!\n");
        delete engine;
        engine = 0;
    } else if (scriptRequiresOpenType(script)) {
        QOpenType *ot = engine->openType();
        if (!ot || !ot->supportsScript(script)) {
            FM_DEBUG("  OpenType support missing for script\n");
            delete engine;
            engine = 0;
        }
    }
done:
    FcPatternDestroy(pattern);
    return engine;
}

FcFontSet *qt_fontSetForPattern(FcPattern *pattern, const QFontDef &request)
{
    FcResult result;
    FcFontSet *fs = FcFontSort(0, pattern, FcTrue, 0, &result);
#ifdef FONT_MATCH_DEBUG
    FM_DEBUG("first font in fontset:\n");
    FcPatternPrint(fs->fonts[0]);
#endif

    FcBool forceScalable = request.styleStrategy & QFont::ForceOutline;

    // remove fonts if they are not scalable (and should be)
    if (forceScalable) {
        for (int i = 0; i < fs->nfont; ++i) {
            FcPattern *font = fs->fonts[i];
            FcResult res;
            FcBool scalable;
            res = FcPatternGetBool(font, FC_SCALABLE, 0, &scalable);
            if (res != FcResultMatch || !scalable) {
                FcFontSetRemove(fs, i);
#ifdef FONT_MATCH_DEBUG
                FM_DEBUG("removing pattern:");
                FcPatternPrint(font);
#endif
                --i; // go back one
            }
        }
    }

    FM_DEBUG("final pattern contains %d fonts\n", fs->nfont);

    return fs;
}

static QFontEngine *loadFc(const QFontPrivate *fp, int script, const QFontDef &request)
{
    FM_DEBUG("===================== loadFc: script=%d family='%s'\n", script, request.family.toLatin1().data());
    FcPattern *pattern = getFcPattern(fp, script, request);

#ifdef FONT_MATCH_DEBUG
    FM_DEBUG("\n\nfinal FcPattern contains:\n");
    FcPatternPrint(pattern);
#endif

    QFontEngine *fe = 0;
    fe = tryPatternLoad(pattern, fp->screen, request, script);
    if (!fe) {
        FcFontSet *fs = qt_fontSetForPattern(pattern, request);

        for (int i = 0; !fe && i < fs->nfont; ++i)
            fe = tryPatternLoad(fs->fonts[i], fp->screen, request, script);
        FcFontSetDestroy(fs);
        FM_DEBUG("engine for script %d is %s\n", script, fe ? fe->fontDef.family.toLatin1().data(): "(null)");
    }
    if (fe
        && script == QUnicodeTables::Common
        && !(request.styleStrategy & QFont::NoFontMerging) && !fe->symbol) {
        fe = new QFontEngineMultiFT(fe, pattern, fp->screen, request);
    } else {
        FcPatternDestroy(pattern);
    }
    return fe;
}

static FcPattern *queryFont(const FcChar8 *file, const QByteArray &data, int id, FcBlanks *blanks, int *count)
{
#if FC_VERSION < 20402
    Q_UNUSED(data)
    return FcFreeTypeQuery(file, id, blanks, count);
#else
    if (data.isEmpty())
        return FcFreeTypeQuery(file, id, blanks, count);

    extern FT_Library qt_getFreetype();
    FT_Library lib = qt_getFreetype();

    FcPattern *pattern = 0;

    FT_Face face;
    if (!FT_New_Memory_Face(lib, (const FT_Byte *)data.constData(), data.size(), id, &face)) {
        *count = face->num_faces;

        pattern = FcFreeTypeQueryFace(face, file, id, blanks);

        FT_Done_Face(face);
    }

    return pattern;
#endif
}
#endif // QT_NO_FONTCONFIG

static QFontEngine *loadRaw(const QFontPrivate *fp, const QFontDef &request)
{
    Q_ASSERT(fp && fp->rawMode);

    QByteArray xlfd = request.family.toLatin1();
    FM_DEBUG("Loading XLFD (rawmode) '%s'", xlfd.data());

    QFontEngine *fe;
    XFontStruct *xfs;
    if (!(xfs = XLoadQueryFont(QX11Info::display(), xlfd.data())))
        if (!(xfs = XLoadQueryFont(QX11Info::display(), "fixed")))
            return 0;

    fe = new QFontEngineXLFD(xfs, xlfd, 0);
    if (! qt_fillFontDef(xfs, &fe->fontDef, fp->dpi) &&
        ! qt_fillFontDef(xlfd, &fe->fontDef, fp->dpi))
        fe->fontDef = QFontDef();
    return fe;
}

QFontEngine *QFontDatabase::loadXlfd(int screen, int script, const QFontDef &request, int force_encoding_id)
{
    QtFontDesc desc;
    FM_DEBUG() << "---> loadXlfd: request is" << request.family;
    QStringList families_and_foundries = ::familyList(request);
    const char *stylehint = styleHint(request);
    if (stylehint)
        families_and_foundries << QString::fromLatin1(stylehint);
    families_and_foundries << QString();
    FM_DEBUG() << "loadXlfd: list is" << families_and_foundries;
    for (int i = 0; i < families_and_foundries.size(); ++i) {
        QString family, foundry;
        ::parseFontName(families_and_foundries.at(i), foundry, family);
        FM_DEBUG("loadXlfd: >>>>>>>>>>>>>>trying to match '%s' encoding=%d", family.toLatin1().data(), force_encoding_id);
        ::match(script, request, family, foundry, force_encoding_id, &desc);
        if (desc.family)
            break;
    }

    QFontEngine *fe = 0;
    if (force_encoding_id != -1
        || (request.styleStrategy & QFont::NoFontMerging)
        || (desc.family && desc.family->writingSystems[QFontDatabase::Symbol] & QtFontFamily::Supported)) {
        if (desc.family) {
            int px = desc.size->pixelSize;
            if (desc.style->smoothScalable && px == SMOOTH_SCALABLE)
                px = request.pixelSize;
            else if (desc.style->bitmapScalable && px == 0)
                px = request.pixelSize;

            QByteArray xlfd("-");
            xlfd += desc.foundry->name.isEmpty() ? QByteArray("*") : desc.foundry->name.toLatin1();
            xlfd += "-";
            xlfd += desc.family->name.isEmpty() ? QByteArray("*") : desc.family->name.toLatin1();
            xlfd += "-";
            xlfd += desc.style->weightName ? desc.style->weightName : "*";
            xlfd += "-";
            xlfd += (desc.style->key.style == QFont::StyleItalic
                     ? "i"
                     : (desc.style->key.style == QFont::StyleOblique ? "o" : "r"));
            xlfd += "-";
            xlfd += desc.style->setwidthName ? desc.style->setwidthName : "*";
            // ### handle add-style
            xlfd += "-*-";
            xlfd += QByteArray::number(px);
            xlfd += "-";
            xlfd += QByteArray::number(desc.encoding->xpoint);
            xlfd += "-";
            xlfd += QByteArray::number(desc.encoding->xres);
            xlfd += "-";
            xlfd += QByteArray::number(desc.encoding->yres);
            xlfd += "-";
            xlfd += desc.encoding->pitch;
            xlfd += "-";
            xlfd += QByteArray::number(desc.encoding->avgwidth);
            xlfd += "-";
            xlfd += xlfd_for_id(desc.encoding->encoding);

            FM_DEBUG("    using XLFD: %s\n", xlfd.data());

            const int mib = xlfd_encoding[desc.encoding->encoding].mib;
            XFontStruct *xfs;
            if ((xfs = XLoadQueryFont(QX11Info::display(), xlfd))) {
                fe = new QFontEngineXLFD(xfs, xlfd, mib);
                const int dpi = QX11Info::appDpiY();
                if (!qt_fillFontDef(xfs, &fe->fontDef, dpi)
                    && !qt_fillFontDef(xlfd, &fe->fontDef, dpi)) {
                    initFontDef(desc, request, &fe->fontDef);
                }
            }
        }
        if (!fe) {
            fe = new QFontEngineBox(request.pixelSize);
            fe->fontDef = QFontDef();
        }
    } else {
        QList<int> encodings;
        if (desc.encoding)
            encodings.append(int(desc.encoding->encoding));

        if (desc.size) {
            // append all other encodings for the matched font
            for (int i = 0; i < desc.size->count; ++i) {
                QtFontEncoding *e = desc.size->encodings + i;
                if (e == desc.encoding)
                    continue;
                encodings.append(int(e->encoding));
            }
        }
        // fill in the missing encodings
        const XlfdEncoding *enc = xlfd_encoding;
        for (; enc->name; ++enc) {
            if (!encodings.contains(enc->id))
                encodings.append(enc->id);
        }

#if defined(FONT_MATCH_DEBUG)
        FM_DEBUG("    using MultiXLFD, encodings:");
        for (int i = 0; i < encodings.size(); ++i) {
            const int id = encodings.at(i);
            FM_DEBUG("      %2d: %s", xlfd_encoding[id].id, xlfd_encoding[id].name);
        }
#endif

        fe = new QFontEngineMultiXLFD(request, encodings, screen);
    }
    return fe;
}

/*! \internal
  Loads a QFontEngine for the specified \a script that matches the
  QFontDef \e request member variable.
*/
void QFontDatabase::load(const QFontPrivate *d, int script)
{
    Q_ASSERT(script >= 0 && script < QUnicodeTables::ScriptCount);

    if (!privateDb()->count)
        initializeDb();

    // normalize the request to get better caching
    QFontDef req = d->request;
    if (req.pixelSize <= 0)
        req.pixelSize = qRound(qt_pixelSize(req.pointSize, d->dpi));
    req.pointSize = 0;
    if (req.weight == 0)
        req.weight = QFont::Normal;
    if (req.stretch == 0)
        req.stretch = 100;

    QFontCache::Key key(req, d->rawMode ? QUnicodeTables::Common : script, d->screen);
    if (!d->engineData)
        getEngineData(d, key);

    // the cached engineData could have already loaded the engine we want
    if (d->engineData->engines[script])
        return;

    // set it to the actual pointsize, so QFontInfo will do the right thing
    req.pointSize = qt_pointSize(req.pixelSize, d->dpi);

    QFontEngine *fe = QFontCache::instance->findEngine(key);

    if (!fe) {
        if (qt_enable_test_font && req.family == QLatin1String("__Qt__Box__Engine__")) {
            fe = new QTestFontEngine(req.pixelSize);
            fe->fontDef = req;
        } else if (d->rawMode) {
            fe = loadRaw(d, req);
#ifndef QT_NO_FONTCONFIG
        } else if (X11->has_fontconfig) {
            fe = loadFc(d, script, req);
#endif
        } else {
            fe = loadXlfd(d->screen, script, req);
        }
        if (!fe) {
            fe = new QFontEngineBox(req.pixelSize);
            fe->fontDef = QFontDef();
        }
    }
    if (fe->symbol || (d->request.styleStrategy & QFont::NoFontMerging)) {
        for (int i = 0; i < QUnicodeTables::ScriptCount; ++i) {
            if (!d->engineData->engines[i]) {
                d->engineData->engines[i] = fe;
                fe->ref.ref();
            }
        }
    } else {
        d->engineData->engines[script] = fe;
        fe->ref.ref();
    }
    QFontCache::instance->insertEngine(key, fe);
}

static void registerFont(QFontDatabasePrivate::ApplicationFont *fnt)
{
#if defined(QT_NO_FONTCONFIG)
    return;
#else
    if (!X11->has_fontconfig)
        return;

    FcConfig *config = FcConfigGetCurrent();
    if (!config)
        return;

    FcFontSet *set = FcConfigGetFonts(config, FcSetApplication);
    if (!set) {
        FcConfigAppFontAddFile(config, (const FcChar8 *)":/non-existant");
        set = FcConfigGetFonts(config, FcSetApplication); // try again
        if (!set)
            return;
    }

    QString fileNameForQuery = fnt->fileName;
#if FC_VERSION < 20402
    QTemporaryFile tmp;

    if (!fnt->data.isEmpty()) {
        if (!tmp.open())
            return;
        tmp.write(fnt->data);
        tmp.flush();
        fileNameForQuery = tmp.fileName();
    }
#endif

    int id = 0;
    FcBlanks *blanks = FcConfigGetBlanks(0);
    int count = 0;

    QStringList families;

    FcPattern *pattern = 0;
    do {
        pattern = queryFont((const FcChar8 *)QFile::encodeName(fileNameForQuery).constData(),
                            fnt->data, id, blanks, &count);
        if (!pattern)
            return;

        FcPatternDel(pattern, FC_FILE);
        FcPatternAddString(pattern, FC_FILE, (const FcChar8 *)fnt->fileName.toUtf8().constData());

        FcChar8 *fam = 0;
        if (FcPatternGetString(pattern, FC_FAMILY, 0, &fam) == FcResultMatch) {
            QString family = QString::fromUtf8(reinterpret_cast<const char *>(fam));
            family.replace(QLatin1Char('-'), QLatin1Char(' '));
            family.remove(QLatin1Char('/'));
            families << family;
        }

        if (!FcFontSetAdd(se