qfontengine_x11.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

            }
            if (pixel & (0x80 >> (x & 7))) {
                int rx = x;
                while (x < w && src[(x+1) >> 3] & (0x80 >> ((x+1) & 7)))
                    ++x;
                path->addRect(QRectF(cp.x() + rx + TRUNC(slot->metrics.horiBearingX),
                                     cp.y() + y - TRUNC(slot->metrics.horiBearingY),
                                     x - rx + 1, 1));
            }
        }
        src += slot->bitmap.pitch;
    }
}

#endif // QT_NO_FREETYPE


// ------------------------------------------------------------------
// Multi XLFD engine
// ------------------------------------------------------------------

QFontEngineMultiXLFD::QFontEngineMultiXLFD(const QFontDef &r, const QList<int> &l, int s)
    : QFontEngineMulti(l.size()), encodings(l), screen(s), request(r)
{
    loadEngine(0);
    fontDef = engines[0]->fontDef;
}

QFontEngineMultiXLFD::~QFontEngineMultiXLFD()
{ }

void QFontEngineMultiXLFD::loadEngine(int at)
{
    Q_ASSERT(at < engines.size());
    Q_ASSERT(engines.at(at) == 0);
    const int encoding = encodings.at(at);
    QFontEngine *fontEngine = QFontDatabase::loadXlfd(0, QUnicodeTables::Common, request, encoding);
    Q_ASSERT(fontEngine != 0);
    fontEngine->ref.ref();
    engines[at] = fontEngine;
}

// ------------------------------------------------------------------
// Xlfd font engine
// ------------------------------------------------------------------

#ifndef QT_NO_FREETYPE

static QStringList *qt_fontpath = 0;

static QStringList fontPath()
{
    if (qt_fontpath)
        return *qt_fontpath;

    // append qsettings fontpath
    QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));
    settings.beginGroup(QLatin1String("Qt"));

    QStringList fontpath;

    int npaths;
    char** font_path;
    font_path = XGetFontPath(X11->display, &npaths);
    bool xfsconfig_read = false;
    for (int i=0; i<npaths; i++) {
        // If we're using xfs, append font paths from /etc/X11/fs/config
        // can't hurt, and chances are we'll get all fonts that way.
        if (((font_path[i])[0] != '/') && !xfsconfig_read) {
            // We're using xfs -> read its config
            bool finished = false;
            QFile f("/etc/X11/fs/config");
            if (!f.exists())
                f.setFileName("/usr/X11R6/lib/X11/fs/config");
            if (!f.exists())
                f.setFileName("/usr/X11/lib/X11/fs/config");
            if (f.exists()) {
                f.open(QIODevice::ReadOnly);
                while (f.error()==QFile::NoError && !finished) {
                    QString fs = f.readLine(1024);
                    fs=fs.trimmed();
                    if (fs.left(9)=="catalogue" && fs.contains('=')) {
                        fs = fs.mid(fs.indexOf('=') + 1).trimmed();
                        bool end = false;
                        while (f.error()==QFile::NoError && !end) {
                            if (fs[int(fs.length())-1] == ',')
                                fs = fs.left(fs.length()-1);
                            else
                                end = true;

                            fs = fs.left(fs.indexOf(":unscaled"));
                            if (fs[0] != '#')
                                fontpath += fs;
                            fs = f.readLine(1024);
                            fs = fs.trimmed();
                            if (fs.isEmpty())
                                end = true;
                        }
                        finished = true;
                    }
                }
                f.close();
            }
            xfsconfig_read = true;
        } else {
            QString fs = QString::fromLatin1(font_path[i]);
            fontpath += fs.left(fs.indexOf(":unscaled"));
        }
    }
    XFreeFontPath(font_path);

    // append qsettings fontpath
    QStringList fp = settings.value(QLatin1String("fontPath")).toStringList();
    if (!fp.isEmpty())
        fontpath += fp;

    qt_fontpath = new QStringList(fontpath);
    return fontpath;
}

static QFontEngine::FaceId fontFile(const QByteArray &_xname, QFreetypeFace **freetype, int *synth)
{
    *freetype = 0;
    *synth = 0;

    QByteArray xname = _xname.toLower();

    int pos = 0;
    int minus = 0;
    while (minus < 5 && (pos = xname.indexOf('-', pos + 1)))
        ++minus;
    QByteArray searchname = xname.left(pos);
    while (minus < 12 && (pos = xname.indexOf('-', pos + 1)))
        ++minus;
    QByteArray encoding = xname.mid(pos + 1);
    //qDebug("xname='%s', searchname='%s', encoding='%s'", xname.data(), searchname.data(), encoding.data());
    QStringList fontpath = ::fontPath();
    QFontEngine::FaceId face_id;
    face_id.index = 0;

    QByteArray best_mapping;

    for (QStringList::ConstIterator it = fontpath.constBegin(); it != fontpath.constEnd(); ++it) {
        if ((*it).left(1) != "/")
            continue; // not a path name, a font server
        QString fontmapname;
        int num = 0;
        // search font.dir and font.scale for the right file
        while (num < 2) {
            if (num == 0)
                fontmapname = (*it) + "/fonts.scale";
            else
                fontmapname = (*it) + "/fonts.dir";
            ++num;
            //qWarning(fontmapname);
            QFile fontmap(fontmapname);
            if (!fontmap.open(QIODevice::ReadOnly))
                continue;
            while (!fontmap.atEnd()) {
                QByteArray mapping = fontmap.readLine();
                QByteArray lmapping = mapping.toLower();

                //qWarning(xfontname);
                //qWarning(mapping);
                if (!lmapping.contains(searchname))
                    continue;
                int index = mapping.indexOf(' ');
                QByteArray ffn = mapping.mid(0,index);
                // remove bitmap formats freetype can't handle
                if(ffn.contains(".spd") || ffn.contains(".phont"))
                    continue;
                bool best_match = false;
                if (!best_mapping.isEmpty()) {
                    if (lmapping.contains("-0-0-0-0-")) { // scalable font
                        best_match = true;
                        goto found;
                    }
                    if (lmapping.contains(encoding) && !best_mapping.toLower().contains(encoding))
                        goto found;
                    continue;
                }

            found:
                int colon = ffn.lastIndexOf(':');
                if (colon != -1) {
                    QByteArray s = ffn.left(colon);
                    ffn = ffn.mid(colon + 1);
                    if (s.contains("ds="))
                        *synth |= QFontEngine::SynthesizedBold;
                    if (s.contains("ai="))
                        *synth |= QFontEngine::SynthesizedItalic;
                }
                face_id.filename = (*it).toLocal8Bit() + '/' + ffn;
                best_mapping = mapping;
                if (best_match)
                    goto end;
            }
        }
    }
end:
//     qDebug("fontfile for %s is from '%s'\n    got %s synth=%d", xname.data(),
//            best_mapping.data(), face_id.filename.data(), *synth);
    *freetype = QFreetypeFace::getFace(face_id);
    if (!*freetype) {
        face_id.index = 0;
        face_id.filename = QByteArray();
    }
    return face_id;
}

#endif // QT_NO_FREETYPE

// defined in qfontdatabase_x11.cpp
extern int qt_mib_for_xlfd_encoding(const char *encoding);
extern int qt_xlfd_encoding_id(const char *encoding);

static inline XCharStruct *charStruct(XFontStruct *xfs, uint ch)
{
    XCharStruct *xcs = 0;
    unsigned char r = ch>>8;
    unsigned char c = ch&0xff;
    if (xfs->per_char &&
         r >= xfs->min_byte1 &&
         r <= xfs->max_byte1 &&
         c >= xfs->min_char_or_byte2 &&
         c <= xfs->max_char_or_byte2) {
        xcs = xfs->per_char + ((r - xfs->min_byte1) *
                               (xfs->max_char_or_byte2 -
                                xfs->min_char_or_byte2 + 1)) +
              (c - xfs->min_char_or_byte2);
        if (xcs->width == 0 && xcs->ascent == 0 &&  xcs->descent == 0)
            xcs = 0;
    }
    return xcs;
}

QFontEngineXLFD::QFontEngineXLFD(XFontStruct *fs, const QByteArray &name, int mib)
    : _fs(fs), _name(name), _codec(0), _cmap(mib)
{
    if (_cmap) _codec = QTextCodec::codecForMib(_cmap);

    cache_cost = (((fs->max_byte1 - fs->min_byte1) *
                   (fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1)) +
                  fs->max_char_or_byte2 - fs->min_char_or_byte2);
    cache_cost = ((fs->max_bounds.ascent + fs->max_bounds.descent) *
                  (fs->max_bounds.width * cache_cost / 8));
    lbearing = SHRT_MIN;
    rbearing = SHRT_MIN;
    face_id.index = -1;
    freetype = 0;
    synth = 0;
}

QFontEngineXLFD::~QFontEngineXLFD()
{
    XFreeFont(QX11Info::display(), _fs);
    _fs = 0;
#ifndef QT_NO_FREETYPE
    if (freetype)
        freetype->release(face_id);
#endif
}

bool QFontEngineXLFD::stringToCMap(const QChar *s, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const
{
    if (*nglyphs < len) {
        *nglyphs = len;
        return false;
    }

    // filter out surrogates, we can't handle them anyway with XLFD fonts
    QVarLengthArray<ushort> _s(len);
    QChar *str = (QChar *)_s.data();
    for (int i = 0; i < len; ++i) {
        if (i < len - 1
            && s[i].unicode() >= 0xd800 && s[i].unicode() < 0xdc00
            && s[i+1].unicode() >= 0xdc00 && s[i].unicode() < 0xe000) {
            *str = QChar();
            ++i;
        } else {
            *str = s[i];
        }
        ++str;
    }

    len = str - (QChar *)_s.data();
    str = (QChar *)_s.data();

    bool mirrored = flags & QTextEngine::RightToLeft;
    if (_codec) {
        bool haveNbsp = false;
        for (int i = 0; i < len; i++)
            if (str[i].unicode() == 0xa0) {
                haveNbsp = true;
                break;
            }

        QVarLengthArray<unsigned short> ch(len);
        QChar *chars = (QChar *)ch.data();
        if (haveNbsp || mirrored) {
            for (int i = 0; i < len; i++)
                chars[i] = (str[i].unicode() == 0xa0 ? 0x20 :
                            (mirrored ? ::mirroredChar(str[i]).unicode() : str[i].unicode()));
        } else {
            for (int i = 0; i < len; i++)
                chars[i] = str[i].unicode();
        }
        QTextCodec::ConverterState state;
        state.flags = QTextCodec::ConvertInvalidToNull;
        QByteArray ba = _codec->fromUnicode(chars, len, &state);
        if (ba.length() == 2*len) {
            // double byte encoding
            const uchar *data = (const uchar *)ba.constData();
            for (int i = 0; i < len; i++) {
                glyphs[i].glyph = ((ushort)data[0] << 8) + data[1];
                data += 2;
            }
        } else {
            const uchar *data = (const uchar *)ba.constData();
            for (int i = 0; i < len; i++)
                glyphs[i].glyph = (ushort)data[i];
        }
    } else {
        QGlyphLayout *g = glyphs + len;
        const QChar *c = str + len;
        if (mirrored) {
            while (c != str)
                (--g)->glyph = (--c)->unicode() == 0xa0 ? 0x20 : ::mirroredChar(*c).unicode();
        } else {
            while (c != str)
                (--g)->glyph = (--c)->unicode() == 0xa0 ? 0x20 : c->unicode();
        }
    }
    *nglyphs = len;

    QGlyphLayout *g = glyphs + len;
    XCharStruct *xcs;
    // inlined for better perfomance
    if (!_fs->per_char) {
        xcs = &_fs->min_bounds;
        while (g != glyphs) {
            --g;
            const unsigned char r = g->glyph >> 8;
            const unsigned char c = g->glyph & 0xff;
            if (r >= _fs->min_byte1 &&
                r <= _fs->max_byte1 &&
                c >= _fs->min_char_or_byte2 &&
                c <= _fs->max_char_or_byte2) {
                g->advance.x = xcs->width;
            } else {
                g->glyph = 0;
            }
        }
    }
    else if (!_fs->max_byte1) {
        XCharStruct *base = _fs->per_char - _fs->min_char_or_byte2;
        while (g != glyphs) {
            unsigned int gl = (--g)->glyph;
            xcs = (gl >= _fs->min_char_or_byte2 && gl <= _fs->max_char_or_byte2) ?
                  base + gl : 0;
            if (!xcs || (!xcs->width && !xcs->ascent && !xcs->descent)) {
                g->glyph = 0;
            } else {
                g->advance.x = xcs->width;
            }
        }
    }
    else {
        while (g != glyphs) {
            xcs = charStruct(_fs, (--g)->glyph);
            if (!xcs) {
                g->glyph = 0;
            } else {
                g->advance.x = xcs->width;
            }
        }
    }
    return true;
}

glyph_metrics_t QFontEngineXLFD::boundingBox(const QGlyphLayout *glyphs, int numGlyphs)
{
    int i;

    glyph_metrics_t overall;
    QFixed ymax;
    QFixed xmax;
    for (i = 0; i < numGlyphs; i++) {
        XCharStruct *xcs = charStruct(_fs, glyphs[i].glyph);
        if (xcs) {
            QFixed x = overall.xoff + glyphs[i].offset.x + xcs->lbearing;
            QFixed y = overall.yoff + glyphs[i].offset.y - xcs->ascent;
            overall.x = qMin(overall.x, x);
            overall.y = qMin(overall.y, y);
            xmax = qMax(xmax, overall.xoff + glyphs[i].offset.x + xcs->rbearing);
            ymax = qMax(ymax, y + xcs->ascent + xcs->descent);
            overall.xoff += glyphs[i].advance.x;
        } else {
            QFixed size = _fs->ascent;
            overall.x = qMin(overall.x, overall.xoff);
            overall.y = qMin(overall.y, overall.yoff - size);
            ymax = qMax(ymax, overall.yoff);
            overall.xoff += size;
            xmax = qMax(xmax, overall.xoff);
        }
    }