qfontdatabase.cpp

奇趣公司比较新的qt/emd版本

// see the Unicode subset bitfields in the MSDN docs
static int requiredUnicodeBits[QFontDatabase::WritingSystemsCount][2] = {
        // Any,
    { 127, 127 },
        // Latin,
    { 0, 127 },
        // Greek,
    { 7, 127 },
        // Cyrillic,
    { 9, 127 },
        // Armenian,
    { 10, 127 },
        // Hebrew,
    { 11, 127 },
        // Arabic,
    { 13, 127 },
        // Syriac,
    { 71, 127 },
    //Thaana,
    { 72, 127 },
    //Devanagari,
    { 15, 127 },
    //Bengali,
    { 16, 127 },
    //Gurmukhi,
    { 17, 127 },
    //Gujarati,
    { 18, 127 },
    //Oriya,
    { 19, 127 },
    //Tamil,
    { 20, 127 },
    //Telugu,
    { 21, 127 },
    //Kannada,
    { 22, 127 },
    //Malayalam,
    { 23, 127 },
    //Sinhala,
    { 73, 127 },
    //Thai,
    { 24, 127 },
    //Lao,
    { 25, 127 },
    //Tibetan,
    { 70, 127 },
    //Myanmar,
    { 74, 127 },
        // Georgian,
    { 26, 127 },
        // Khmer,
    { 80, 127 },
        // SimplifiedChinese,
    { 126, 127 },
        // TraditionalChinese,
    { 126, 127 },
        // Japanese,
    { 126, 127 },
        // Korean,
    { 56, 127 },
        // Vietnamese,
    { 0, 127 }, // same as latin1
        // Other,
    { 126, 127 }
};

#define SimplifiedChineseCsbBit 18
#define TraditionalChineseCsbBit 20
#define JapaneseCsbBit 17
#define KoreanCsbBit 21

static QList<QFontDatabase::WritingSystem> determineWritingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2])
{
    QList<QFontDatabase::WritingSystem> writingSystems;
    bool hasScript = false;

    int i;
    for(i = 0; i < QFontDatabase::WritingSystemsCount; i++) {
        int bit = requiredUnicodeBits[i][0];
        int index = bit/32;
        int flag =  1 << (bit&31);
        if (bit != 126 && unicodeRange[index] & flag) {
            bit = requiredUnicodeBits[i][1];
            index = bit/32;

            flag =  1 << (bit&31);
            if (bit == 127 || unicodeRange[index] & flag) {
                writingSystems.append(QFontDatabase::WritingSystem(i));
                hasScript = true;
                // qDebug("font %s: index=%d, flag=%8x supports script %d", familyName.latin1(), index, flag, i);
            }
        }
    }
    if(codePageRange[0] & (1 << SimplifiedChineseCsbBit)) {
        writingSystems.append(QFontDatabase::SimplifiedChinese);
        hasScript = true;
        //qDebug("font %s supports Simplified Chinese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << TraditionalChineseCsbBit)) {
        writingSystems.append(QFontDatabase::TraditionalChinese);
        hasScript = true;
        //qDebug("font %s supports Traditional Chinese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << JapaneseCsbBit)) {
        writingSystems.append(QFontDatabase::Japanese);
        hasScript = true;
        //qDebug("font %s supports Japanese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << KoreanCsbBit)) {
        writingSystems.append(QFontDatabase::Korean);
        hasScript = true;
        //qDebug("font %s supports Korean", familyName.latin1());
    }
    if (!hasScript)
        writingSystems.append(QFontDatabase::Symbol);

    return writingSystems;
}
#endif

class QFontDatabasePrivate : public QObject
{
    Q_OBJECT
public:
    QFontDatabasePrivate()
        : count(0), families(0), reregisterAppFonts(false)
#if defined(Q_WS_QWS)
          , stream(0)
#endif
    { }
    ~QFontDatabasePrivate() {
        free();
    }
    QtFontFamily *family(const QString &f, bool = false);
    void free() {
        while (count--)
            delete families[count];
        ::free(families);
        families = 0;
        count = 0;
        // don't clear the memory fonts!
    }

    int count;
    QtFontFamily **families;

    struct ApplicationFont {
        QString fileName;
        QByteArray data;
#if defined(Q_OS_WIN)
        HANDLE handle;
        bool memoryFont;
#elif defined(Q_WS_MAC)
        ATSFontContainerRef handle;
#endif
        QStringList families;
    };
    QVector<ApplicationFont> applicationFonts;
    int addAppFont(const QByteArray &fontData, const QString &fileName);
    bool reregisterAppFonts;
    bool isApplicationFont(const QString &fileName);

    void invalidate();

#if defined(Q_WS_QWS)
    bool loadFromCache(const QString &fontPath);
    void addFont(const QString &familyname, const char *foundryname, int weight,
                 bool italic, int pixelSize, const QByteArray &file, int fileIndex,
                 bool antialiased,
                 const QList<QFontDatabase::WritingSystem> &writingSystems = QList<QFontDatabase::WritingSystem>());
    void addQPF2File(const QByteArray &file);
#ifndef QT_NO_FREETYPE
    QStringList addTTFile(const QByteArray &file, const QByteArray &fontData = QByteArray());
#endif

    QDataStream *stream;
    QStringList fallbackFamilies;
#endif

Q_SIGNALS:
    void fontDatabaseChanged();
};

void QFontDatabasePrivate::invalidate()
{
    if (QFontCache::instance)
        QFontCache::instance->clear();
    free();
    emit fontDatabaseChanged();
}

QtFontFamily *QFontDatabasePrivate::family(const QString &f, bool create)
{
    int low = 0;
    int high = count;
    int pos = count / 2;
    int res = 1;
    if (count) {
        while ((res = families[pos]->name.compare(f, Qt::CaseInsensitive)) && pos != low) {
            if (res > 0)
                high = pos;
            else
                low = pos;
            pos = (high + low) / 2;
        };
        if (!res)
            return families[pos];
    }
    if (!create)
        return 0;

    if (res < 0)
        pos++;

    // qDebug("adding family %s at %d total=%d", f.latin1(), pos, count);
    if (!(count % 8))
        families = (QtFontFamily **)
                   realloc(families,
                            (((count+8) >> 3) << 3) * sizeof(QtFontFamily *));

    memmove(families + pos + 1, families + pos, (count-pos)*sizeof(QtFontFamily *));
    families[pos] = new QtFontFamily(f);
    count++;
    return families[pos];
}


static const int scriptForWritingSystem[] = {
    QUnicodeTables::Common, // Any
    QUnicodeTables::Latin, // Latin
    QUnicodeTables::Greek, // Greek
    QUnicodeTables::Cyrillic, // Cyrillic
    QUnicodeTables::Armenian, // Armenian
    QUnicodeTables::Hebrew, // Hebrew
    QUnicodeTables::Arabic, // Arabic
    QUnicodeTables::Syriac, // Syriac
    QUnicodeTables::Thaana, // Thaana
    QUnicodeTables::Devanagari, // Devanagari
    QUnicodeTables::Bengali, // Bengali
    QUnicodeTables::Gurmukhi, // Gurmukhi
    QUnicodeTables::Gujarati, // Gujarati
    QUnicodeTables::Oriya, // Oriya
    QUnicodeTables::Tamil, // Tamil
    QUnicodeTables::Telugu, // Telugu
    QUnicodeTables::Kannada, // Kannada
    QUnicodeTables::Malayalam, // Malayalam
    QUnicodeTables::Sinhala, // Sinhala
    QUnicodeTables::Thai, // Thai
    QUnicodeTables::Lao, // Lao
    QUnicodeTables::Tibetan, // Tibetan
    QUnicodeTables::Myanmar, // Myanmar
    QUnicodeTables::Georgian, // Georgian
    QUnicodeTables::Khmer, // Khmer
    QUnicodeTables::Common, // SimplifiedChinese
    QUnicodeTables::Common, // TraditionalChinese
    QUnicodeTables::Common, // Japanese
    QUnicodeTables::Hangul, // Korean
    QUnicodeTables::Common, // Vietnamese
    QUnicodeTables::Common, // Yi
    QUnicodeTables::Common, // Tagalog
    QUnicodeTables::Common, // Hanunoo
    QUnicodeTables::Common, // Buhid
    QUnicodeTables::Common, // Tagbanwa
    QUnicodeTables::Common, // Limbu
    QUnicodeTables::Common, // TaiLe
    QUnicodeTables::Common, // Braille
    QUnicodeTables::Common, // Symbol
    QUnicodeTables::Ogham,  // Ogham
    QUnicodeTables::Runic // Runic
};


#if defined Q_WS_QWS || (defined(Q_WS_X11) && !defined(QT_NO_FONTCONFIG))
static inline bool requiresOpenType(int writingSystem)
{
    return ((writingSystem >= QFontDatabase::Syriac && writingSystem <= QFontDatabase::Sinhala)
            || writingSystem == QFontDatabase::Khmer);
}
static inline bool scriptRequiresOpenType(int script)
{
    return ((script >= QUnicodeTables::Syriac && script <= QUnicodeTables::Sinhala)
            || script == QUnicodeTables::Khmer);
}
#endif


/*!
  \internal

  This makes sense of the font family name:

  if the family name contains a '[' and a ']', then we take the text
  between the square brackets as the foundry, and the text before the
  square brackets as the family (ie. "Arial [Monotype]")
*/
static void parseFontName(const QString &name, QString &foundry, QString &family)
{
    int i = name.indexOf(QLatin1Char('['));
    int li = name.lastIndexOf(QLatin1Char(']'));
    if (i >= 0 && li >= 0 && i < li) {
        foundry = name.mid(i + 1, li - i - 1);
        if (i > 0 && name[i - 1] == QLatin1Char(' '))
            i--;
        family = name.left(i);
    } else {
        foundry.clear();
        family = name;
    }

    // capitalize the family/foundry names
    bool space = true;
    QChar *s = family.data();
    int len = family.length();
    while(len--) {
        if (space) *s = s->toUpper();
        space = s->isSpace();
        ++s;
    }

    space = true;
    s = foundry.data();
    len = foundry.length();
    while(len--) {
        if (space) *s = s->toUpper();
        space = s->isSpace();
        ++s;
    }
}


struct QtFontDesc
{
    inline QtFontDesc() : family(0), foundry(0), style(0), size(0), encoding(0) {}
    QtFontFamily *family;
    QtFontFoundry *foundry;
    QtFontStyle *style;
    QtFontSize *size;
    QtFontEncoding *encoding;
};

#if !defined(Q_WS_MAC)
static void match(int script, const QFontDef &request,
                  const QString &family_name, const QString &foundry_name, int force_encoding_id,
                  QtFontDesc *desc);

#if defined(Q_WS_X11) || defined(Q_WS_QWS)
static void initFontDef(const QtFontDesc &desc, const QFontDef &request, QFontDef *fontDef)
{
    fontDef->family = desc.family->name;
    if (! desc.foundry->name.isEmpty()) {
        fontDef->family += QString::fromLatin1(" [");
        fontDef->family += desc.foundry->name;
        fontDef->family += QString::fromLatin1("]");
    }

    if (desc.style->smoothScalable)
        fontDef->pixelSize = request.pixelSize;
    else if ((desc.style->bitmapScalable && (request.styleStrategy & QFont::PreferMatch)))
        fontDef->pixelSize = request.pixelSize;
    else
        fontDef->pixelSize = desc.size->pixelSize;

    fontDef->styleHint     = request.styleHint;
    fontDef->styleStrategy = request.styleStrategy;

    fontDef->weight        = desc.style->key.weight;
    fontDef->style         = desc.style->key.style;
    fontDef->fixedPitch    = desc.family->fixedPitch;
    fontDef->stretch       = desc.style->key.stretch;
    fontDef->ignorePitch   = false;
}
#endif
#endif

#if defined(Q_WS_X11) || defined(Q_WS_WIN)
static void getEngineData(const QFontPrivate *d, const QFontCache::Key &key)
{
    // look for the requested font in the engine data cache
    d->engineData = QFontCache::instance->findEngineData(key);
    if (!d->engineData) {
        // create a new one
        d->engineData = new QFontEngineData;
        QFontCache::instance->insertEngineData(key, d->engineData);
    } else {
        d->engineData->ref.ref();
    }
}

static QStringList familyList(const QFontDef &req)
{
    // list of families to try
    QStringList family_list;
    if (req.family.isEmpty())
        return family_list;

    QStringList list = req.family.split(QLatin1Char(','));
    for (int i = 0; i < list.size(); ++i) {
        QString str = list.at(i).trimmed();
        if ((str.startsWith(QLatin1Char('"')) && str.endsWith(QLatin1Char('"')))
            || (str.startsWith(QLatin1Char('\'')) && str.endsWith(QLatin1Char('\''))))
            str = str.mid(1, str.length() - 2);
        family_list << str;
    }

    // append the substitute list for each family in family_list
    QStringList subs_list;
    QStringList::ConstIterator it = family_list.constBegin(), end = family_list.constEnd();
    for (; it != end; ++it)
        subs_list += QFont::substitutes(*it);
//         qDebug() << "adding substs: " << subs_list;

    family_list += subs_list;

    return family_list;
}
#endif

Q_GLOBAL_STATIC(QFontDatabasePrivate, privateDb)

// used in qfontcombobox.cpp
QObject *qt_fontdatabase_private()
{
    return privateDb();
}

#define SMOOTH_SCALABLE 0xffff

#if defined(Q_WS_X11)
#  include "qfontdatabase_x11.cpp"
#elif defined(Q_WS_MAC)
#  include "qfontdatabase_mac.cpp"
#elif defined(Q_WS_WIN)
#  include "qfontdatabase_win.cpp"
#elif defined(Q_WS_QWS)
#  include "qfontdatabase_qws.cpp"
#endif

static QtFontStyle *bestStyle(QtFontFoundry *foundry, const QtFontStyle::Key &styleKey)
{