qfontdatabase_x11.cpp

奇趣公司比较新的qt/emd版本

}

static const char * xlfd_for_id(int id)
{
    // special case: -1 returns the "*-*" encoding, allowing us to do full
    // database population in a single X server round trip.
    if (id < 0 || id > numEncodings)
        return "*-*";
    return xlfd_encoding[id].name;
}

enum XLFDFieldNames {
    Foundry,
    Family,
    Weight,
    Slant,
    Width,
    AddStyle,
    PixelSize,
    PointSize,
    ResolutionX,
    ResolutionY,
    Spacing,
    AverageWidth,
    CharsetRegistry,
    CharsetEncoding,
    NFontFields
};

// Splits an X font name into fields separated by '-'
static bool parseXFontName(char *fontName, char **tokens)
{
    if (! fontName || fontName[0] == '0' || fontName[0] != '-') {
        tokens[0] = 0;
        return false;
    }

    int          i;
    ++fontName;
    for (i = 0; i < NFontFields && fontName && fontName[0]; ++i) {
        tokens[i] = fontName;
        for (;; ++fontName) {
            if (*fontName == '-')
                break;
            if (! *fontName) {
                fontName = 0;
                break;
            }
        }

        if (fontName) *fontName++ = '\0';
    }

    if (i < NFontFields) {
        for (int j = i ; j < NFontFields; ++j)
            tokens[j] = 0;
        return false;
    }

    return true;
}

static inline bool isZero(char *x)
{
    return (x[0] == '0' && x[1] == 0);
}

static inline bool isScalable(char **tokens)
{
    return (isZero(tokens[PixelSize]) &&
            isZero(tokens[PointSize]) &&
            isZero(tokens[AverageWidth]));
}

static inline bool isSmoothlyScalable(char **tokens)
{
    return (isZero(tokens[ResolutionX]) &&
            isZero(tokens[ResolutionY]));
}

static inline bool isFixedPitch(char **tokens)
{
    return (tokens[Spacing][0] == 'm' ||
            tokens[Spacing][0] == 'c' ||
            tokens[Spacing][0] == 'M' ||
            tokens[Spacing][0] == 'C');
}

/*
  Fills in a font definition (QFontDef) from an XLFD (X Logical Font
  Description).

  Returns true if the the given xlfd is valid.
*/
bool qt_fillFontDef(const QByteArray &xlfd, QFontDef *fd, int dpi)
{
    char *tokens[NFontFields];
    QByteArray buffer = xlfd;
    if (! parseXFontName(buffer.data(), tokens))
        return false;

    capitalize(tokens[Family]);
    capitalize(tokens[Foundry]);

    fd->styleStrategy |= QFont::NoAntialias;
    fd->family = QString::fromLatin1(tokens[Family]);
    QString foundry = QString::fromLatin1(tokens[Foundry]);
    if (! foundry.isEmpty() && foundry != QString::fromLatin1("*"))
        fd->family +=
            QString::fromLatin1(" [") + foundry + QString::fromLatin1("]");

    if (qstrlen(tokens[AddStyle]) > 0)
        fd->addStyle = QString::fromLatin1(tokens[AddStyle]);
    else
        fd->addStyle.clear();

    fd->pointSize = atoi(tokens[PointSize])/10.;
    fd->styleHint = QFont::AnyStyle;        // ### any until we match families

    char slant = tolower((uchar) tokens[Slant][0]);
    fd->style = (slant == 'o' ? QFont::StyleOblique : (slant == 'i' ? QFont::StyleItalic : QFont::StyleNormal));
    char fixed = tolower((uchar) tokens[Spacing][0]);
    fd->fixedPitch = (fixed == 'm' || fixed == 'c');
    fd->weight = getFontWeight(QLatin1String(tokens[Weight]));

    int r = atoi(tokens[ResolutionY]);
    fd->pixelSize = atoi(tokens[PixelSize]);
    // not "0" or "*", or required DPI
    if (r && fd->pixelSize && r != dpi) {
        // calculate actual pointsize for display DPI
        fd->pointSize = qt_pointSize(fd->pixelSize, dpi);
    } else if (fd->pixelSize == 0 && fd->pointSize) {
        // calculate pixel size from pointsize/dpi
        fd->pixelSize = qRound(qt_pixelSize(fd->pointSize, dpi));
    }

    return true;
}

/*
  Fills in a font definition (QFontDef) from the font properties in an
  XFontStruct.

  Returns true if the QFontDef could be filled with properties from
  the XFontStruct.
*/
static bool qt_fillFontDef(XFontStruct *fs, QFontDef *fd, int dpi)
{
    unsigned long value;
    if (!fs || !XGetFontProperty(fs, XA_FONT, &value))
        return false;

    char *n = XGetAtomName(QX11Info::display(), value);
    QByteArray xlfd(n);
    if (n)
        XFree(n);
    return qt_fillFontDef(xlfd.toLower(), fd, dpi);
}


static QtFontStyle::Key getStyle(char ** tokens)
{
    QtFontStyle::Key key;

    char slant0 = tolower((uchar) tokens[Slant][0]);

    if (slant0 == 'r') {
        if (tokens[Slant][1]) {
            char slant1 = tolower((uchar) tokens[Slant][1]);

            if (slant1 == 'o')
                key.style = QFont::StyleOblique;
            else if (slant1 == 'i')
                key.style = QFont::StyleItalic;
        }
    } else if (slant0 == 'o')
        key.style = QFont::StyleOblique;
    else if (slant0 == 'i')
        key.style = QFont::StyleItalic;

    key.weight = getFontWeight(QLatin1String(tokens[Weight]));

    if (qstrcmp(tokens[Width], "normal") == 0) {
        key.stretch = 100;
    } else if (qstrcmp(tokens[Width], "semi condensed") == 0 ||
               qstrcmp(tokens[Width], "semicondensed") == 0) {
        key.stretch = 90;
    } else if (qstrcmp(tokens[Width], "condensed") == 0) {
        key.stretch = 80;
    } else if (qstrcmp(tokens[Width], "narrow") == 0) {
        key.stretch = 60;
    }

    return key;
}


static bool xlfdsFullyLoaded = false;
static unsigned char encodingLoaded[numEncodings];

static void loadXlfds(const char *reqFamily, int encoding_id)
{
    QFontDatabasePrivate *db = privateDb();
    QtFontFamily *fontFamily = reqFamily ? db->family(QLatin1String(reqFamily)) : 0;

    // make sure we don't load twice
    if ((encoding_id == -1 && xlfdsFullyLoaded)
        || (encoding_id != -1 && encodingLoaded[encoding_id]))
        return;
    if (fontFamily && fontFamily->xlfdLoaded)
        return;

    int fontCount;
    // force the X server to give us XLFDs
    QByteArray xlfd_pattern("-*-");
    xlfd_pattern += (reqFamily && reqFamily[0] != '\0') ? reqFamily : "*";
    xlfd_pattern += "-*-*-*-*-*-*-*-*-*-*-";
    xlfd_pattern += xlfd_for_id(encoding_id);

    char **fontList = XListFonts(QX11Info::display(),
                                 xlfd_pattern,
                                 0xffff, &fontCount);
    // qDebug("requesting xlfd='%s', got %d fonts", xlfd_pattern.data(), fontCount);


    char *tokens[NFontFields];

    for(int i = 0 ; i < fontCount ; i++) {
        if (! parseXFontName(fontList[i], tokens))
            continue;

        // get the encoding_id for this xlfd.  we need to do this
        // here, since we can pass -1 to this function to do full
        // database population
        *(tokens[CharsetEncoding] - 1) = '-';
        int encoding_id = qt_xlfd_encoding_id(tokens[CharsetRegistry]);
        if (encoding_id == -1)
            continue;

        char *familyName = tokens[Family];
        capitalize(familyName);
        char *foundryName = tokens[Foundry];
        capitalize(foundryName);
        QtFontStyle::Key styleKey = getStyle(tokens);

        bool smooth_scalable = false;
        bool bitmap_scalable = false;
        if (isScalable(tokens)) {
            if (isSmoothlyScalable(tokens))
                smooth_scalable = true;
            else
                bitmap_scalable = true;
        }
        uint pixelSize = atoi(tokens[PixelSize]);
        uint xpointSize = atoi(tokens[PointSize]);
        uint xres = atoi(tokens[ResolutionX]);
        uint yres = atoi(tokens[ResolutionY]);
        uint avgwidth = atoi(tokens[AverageWidth]);
        bool fixedPitch = isFixedPitch(tokens);

        if (avgwidth == 0 && pixelSize != 0) {
            /*
              Ignore bitmap scalable fonts that are automatically
              generated by some X servers.  We know they are bitmap
              scalable because even though they have a specified pixel
              size, the average width is zero.
            */
            continue;
        }

        QtFontFamily *family = fontFamily ? fontFamily : db->family(QLatin1String(familyName), true);
        family->fontFileIndex = -1;
        family->symbol_checked = true;
        QtFontFoundry *foundry = family->foundry(QLatin1String(foundryName), true);
        QtFontStyle *style = foundry->style(styleKey, true);

        delete [] style->weightName;
        style->weightName = qstrdup(tokens[Weight]);
        delete [] style->setwidthName;
        style->setwidthName = qstrdup(tokens[Width]);

        if (smooth_scalable) {
            style->smoothScalable = true;
            style->bitmapScalable = false;
            pixelSize = SMOOTH_SCALABLE;
        }
        if (!style->smoothScalable && bitmap_scalable)
            style->bitmapScalable = true;
        if (!fixedPitch)
            family->fixedPitch = false;

        QtFontSize *size = style->pixelSize(pixelSize, true);
        QtFontEncoding *enc =
            size->encodingID(encoding_id, xpointSize, xres, yres, avgwidth, true);
        enc->pitch = *tokens[Spacing];
        if (!enc->pitch) enc->pitch = '*';

        for (int i = 0; i < QFontDatabase::WritingSystemsCount; ++i) {
            if (writingSystems_for_xlfd_encoding[encoding_id][i])
                family->writingSystems[i] = QtFontFamily::Supported;
        }
    }
    if (!reqFamily) {
        // mark encoding as loaded
        if (encoding_id == -1)
            xlfdsFullyLoaded = true;
        else
            encodingLoaded[encoding_id] = true;
    }

    XFreeFontNames(fontList);
}


#ifndef QT_NO_FONTCONFIG

#ifndef FC_WIDTH
#define FC_WIDTH "width"
#endif

static int getFCWeight(int fc_weight)
{
    int qtweight = QFont::Black;
    if (fc_weight <= (FC_WEIGHT_LIGHT + FC_WEIGHT_MEDIUM) / 2)
        qtweight = QFont::Light;
    else if (fc_weight <= (FC_WEIGHT_MEDIUM + FC_WEIGHT_DEMIBOLD) / 2)
        qtweight = QFont::Normal;
    else if (fc_weight <= (FC_WEIGHT_DEMIBOLD + FC_WEIGHT_BOLD) / 2)
        qtweight = QFont::DemiBold;
    else if (fc_weight <= (FC_WEIGHT_BOLD + FC_WEIGHT_BLACK) / 2)
        qtweight = QFont::Bold;

    return qtweight;
}

QFontDef qt_FcPatternToQFontDef(FcPattern *pattern, const QFontDef &request)
{
    QFontDef fontDef;
    fontDef.styleStrategy = request.styleStrategy;

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

    double dpi;
    if (FcPatternGetDouble(pattern, FC_DPI, 0, &dpi) != FcResultMatch) {
        if (X11->display)
            dpi = QX11Info::appDpiY();
        else
            dpi = 96; // ####
    }

    double size;
    if (FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
        fontDef.pixelSize = qRound(size);
    else
        fontDef.pixelSize = 12;

    fontDef.pointSize = qt_pointSize(fontDef.pixelSize, qRound(dpi));

    /* ###
       fontDef.styleHint
    */

    int weight;
    if (FcPatternGetInteger(pattern, FC_WEIGHT, 0, &weight) != FcResultMatch)
        weight = FC_WEIGHT_MEDIUM;
    fontDef.weight = getFCWeight(weight);

    int slant;
    if (FcPatternGetInteger(pattern, FC_SLANT, 0, &slant) != FcResultMatch)
        slant = FC_SLANT_ROMAN;
    fontDef.style = (slant == FC_SLANT_ITALIC)
                    ? QFont::StyleItalic
                    : ((slant == FC_SLANT_OBLIQUE)
                       ? QFont::StyleOblique
                       : QFont::StyleNormal);


    FcBool scalable;
    if (FcPatternGetBool(pattern, FC_SCALABLE, 0, &scalable) != FcResultMatch)
        scalable = false;
    if (scalable) {
        fontDef.stretch = request.stretch;
        fontDef.style = request.style;
    } else {
        int width;
        if (FcPatternGetInteger(pattern, FC_WIDTH, 0, &width) == FcResultMatch)
            fontDef.stretch = width;
        else
            fontDef.stretch = 100;
    }

    int spacing;