qfontdatabase_x11.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    0xd9a, // Sinhala
    0, // Thai
    0, // Lao
    0, // Tibetan
    0x1000, // Myanmar
    0, // Korean
    0  // Khmer
};
enum { SpecialCharCount = sizeof(specialChars) / sizeof(ushort) };

// Newer FontConfig let's us sort out fonts that contain certain glyphs, but no
// open type tables for is directly. Do this so we don't pick some strange
// pseudo unicode font
static const char *openType[] = {
    0,     // Any
    0,  // Latin
    0,  // Greek
    0,  // Cyrillic
    0,  // Armenian
    0,  // Hebrew
    0,  // Arabic
    "syrc",  // Syriac
    "thaa",  // Thaana
    "deva",  // Devanagari
    "beng",  // Bengali
    "guru",  // Gurmukhi
    "gurj",  // Gujarati
    "orya",  // Oriya
    "taml",  // Tamil
    "telu",  // Telugu
    "knda",  // Kannada
    "mlym",  // Malayalam
    "sinh",  // Sinhala
    0,  // Thai
    0,  // Lao
    "tibt",  // Tibetan
    "mymr",  // Myanmar
    0,  // Georgian
    "khmr",  // Khmer
    0, // SimplifiedChinese
    0, // TraditionalChinese
    0,  // Japanese
    0,  // Korean
    0  // Vietnamese
};
enum { OpenTypeCount = sizeof(openType) / sizeof(const char *) };


static void loadFontConfig()
{
    Q_ASSERT_X(X11, "QFontDatabase",
               "A QApplication object needs to be constructed before FontConfig is used.");
    if (!X11->has_fontconfig)
        return;

    Q_ASSERT_X(int(QUnicodeTables::ScriptCount) == SpecialLanguageCount,
               "QFontDatabase", "New scripts have been added.");
    Q_ASSERT_X(int(QUnicodeTables::ScriptCount) == SpecialCharCount,
               "QFontDatabase", "New scripts have been added.");
    Q_ASSERT_X((QFontDatabase::WritingSystemsCount - 1) == LanguageCount,
               "QFontDatabase", "New writing systems have been added.");
    Q_ASSERT_X((QFontDatabase::WritingSystemsCount - 1) == SampleCharCount,
               "QFontDatabase", "New writing systems have been added.");
    Q_ASSERT_X((QFontDatabase::WritingSystemsCount - 1) == OpenTypeCount,
               "QFontDatabase", "New writing systems have been added.");

    QFontDatabasePrivate *db = privateDb();
    FcFontSet  *fonts;

    QString familyName;
    QString rawName;
    FcChar8 *value = 0;
    int weight_value;
    int slant_value;
    int spacing_value;
    FcChar8 *file_value;
    int index_value;
    FcChar8 *foundry_value;
    FcBool scalable;

    {
        FcObjectSet *os = FcObjectSetCreate();
        FcPattern *pattern = FcPatternCreate();
        const char *properties [] = {
            FC_FAMILY, FC_WEIGHT, FC_SLANT,
            FC_SPACING, FC_FILE, FC_INDEX,
            FC_LANG, FC_CHARSET, FC_FOUNDRY, FC_SCALABLE, FC_PIXEL_SIZE, FC_WEIGHT,
            FC_WIDTH,
#if FC_VERSION >= 20297
            FC_CAPABILITY,
#endif
            (const char *)0
        };
        const char **p = properties;
        while (*p) {
            FcObjectSetAdd(os, *p);
            ++p;
        }
        fonts = FcFontList(0, pattern, os);
        FcObjectSetDestroy(os);
        FcPatternDestroy(pattern);
    }

    for (int i = 0; i < fonts->nfont; i++) {
        if (FcPatternGetString(fonts->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
            continue;
        //         capitalize(value);
        rawName = familyName = QString::fromUtf8((const char *)value);
        familyName.replace('-', ' ');
        familyName.replace("/", "");
        slant_value = FC_SLANT_ROMAN;
        weight_value = FC_WEIGHT_MEDIUM;
        spacing_value = FC_PROPORTIONAL;
	file_value = 0;
	index_value = 0;
	scalable = FcTrue;

        if (FcPatternGetInteger (fonts->fonts[i], FC_SLANT, 0, &slant_value) != FcResultMatch)
	    slant_value = FC_SLANT_ROMAN;
        if (FcPatternGetInteger (fonts->fonts[i], FC_WEIGHT, 0, &weight_value) != FcResultMatch)
	    weight_value = FC_WEIGHT_MEDIUM;
        if (FcPatternGetInteger (fonts->fonts[i], FC_SPACING, 0, &spacing_value) != FcResultMatch)
	    spacing_value = FC_PROPORTIONAL;
        if (FcPatternGetString (fonts->fonts[i], FC_FILE, 0, &file_value) != FcResultMatch)
	    file_value = 0;
        if (FcPatternGetInteger (fonts->fonts[i], FC_INDEX, 0, &index_value) != FcResultMatch)
	    index_value = 0;
        if (FcPatternGetBool(fonts->fonts[i], FC_SCALABLE, 0, &scalable) != FcResultMatch)
	    scalable = FcTrue;
        if (FcPatternGetString(fonts->fonts[i], FC_FOUNDRY, 0, &foundry_value) != FcResultMatch)
	    foundry_value = 0;
        QtFontFamily *family = db->family(familyName, true);
        family->rawName = rawName;
        family->hasFT = true;

        FcLangSet *langset = 0;
        FcResult res = FcPatternGetLangSet(fonts->fonts[i], FC_LANG, 0, &langset);
        if (res == FcResultMatch) {
            for (int i = 1; i < LanguageCount; ++i) {
                const FcChar8 *lang = (const FcChar8*) languageForWritingSystem[i];
                if (!lang) {
                    family->writingSystems[i] |= QtFontFamily::UnsupportedFT;
                } else {
                    FcLangResult langRes = FcLangSetHasLang(langset, lang);
                    if (langRes != FcLangDifferentLang)
                        family->writingSystems[i] = QtFontFamily::Supported;
                    else
                        family->writingSystems[i] |= QtFontFamily::UnsupportedFT;
                }
            }
            family->writingSystems[QFontDatabase::Other] = QtFontFamily::UnsupportedFT;
            family->ftWritingSystemCheck = true;
        } else {
            // we set Other to supported for symbol fonts. It makes no
            // sense to merge these with other ones, as they are
            // special in a way.
            for (int i = 1; i < LanguageCount; ++i)
                family->writingSystems[i] |= QtFontFamily::UnsupportedFT;
            family->writingSystems[QFontDatabase::Other] = QtFontFamily::Supported;
        }

        FcCharSet *cs = 0;
        res = FcPatternGetCharSet(fonts->fonts[i], FC_CHARSET, 0, &cs);
        if (res == FcResultMatch) {
            // some languages are not supported by FontConfig, we rather check the
            // charset to detect these
            for (int i = 1; i < SampleCharCount; ++i) {
                if (!sampleCharForWritingSystem[i])
                    continue;
                if (FcCharSetHasChar(cs, sampleCharForWritingSystem[i]))
                    family->writingSystems[i] = QtFontFamily::Supported;
            }
        }

#if FC_VERSION >= 20297
        for (int j = 1; j < LanguageCount; ++j) {
            if (family->writingSystems[j] == QtFontFamily::Supported && requiresOpenType(j) && openType[j]) {
                FcChar8 *cap;
                res = FcPatternGetString (fonts->fonts[i], FC_CAPABILITY, 0, &cap);
                if (res != FcResultMatch || !strstr((const char *)cap, openType[j]))
                    family->writingSystems[j] = QtFontFamily::UnsupportedFT;
            }
        }
#endif

        QByteArray file((const char *)file_value);
        family->fontFilename = file;
        family->fontFileIndex = index_value;

        QtFontStyle::Key styleKey;
        styleKey.style = (slant_value == FC_SLANT_ITALIC)
                         ? QFont::StyleItalic
                         : ((slant_value == FC_SLANT_OBLIQUE)
                            ? QFont::StyleOblique
                            : QFont::StyleNormal);
        styleKey.weight = getFCWeight(weight_value);
        if (!scalable) {
            int width = 100;
            FcPatternGetInteger (fonts->fonts[i], FC_WIDTH, 0, &width);
            styleKey.stretch = width;
        }

        QtFontFoundry *foundry
            = family->foundry(foundry_value ? QString::fromUtf8((const char *)foundry_value) : QString(), true);
        QtFontStyle *style = foundry->style(styleKey, true);

        if (spacing_value < FC_MONO)
            family->fixedPitch = false;

        QtFontSize *size;
        if (scalable) {
            style->smoothScalable = true;
            size = style->pixelSize(SMOOTH_SCALABLE, true);
        } else {
            double pixel_size = 0;
            FcPatternGetDouble (fonts->fonts[i], FC_PIXEL_SIZE, 0, &pixel_size);
            size = style->pixelSize((int)pixel_size, true);
        }
        QtFontEncoding *enc = size->encodingID(-1, 0, 0, 0, 0, true);
        enc->pitch = (spacing_value >= FC_CHARCELL ? 'c' :
                      (spacing_value >= FC_MONO ? 'm' : 'p'));
    }

    FcFontSetDestroy (fonts);

    struct FcDefaultFont {
        const char *qtname;
        const char *rawname;
        bool fixed;
    };
    const FcDefaultFont defaults[] = {
        { "Serif", "serif", false },
        { "Sans Serif", "sans-serif", false },
        { "Monospace", "monospace", true },
        { 0, 0, false }
    };
    const FcDefaultFont *f = defaults;
    while (f->qtname) {
        QtFontFamily *family = db->family(f->qtname, true);
        family->fixedPitch = f->fixed;
        family->rawName = f->rawname;
        family->hasFT = true;
        family->synthetic = true;
        QtFontFoundry *foundry = family->foundry(QString(), true);

        // aliases only make sense for 'common', not for any of the specials
        for (int i = 1; i < LanguageCount; ++i) {
            if (requiresOpenType(i))
                family->writingSystems[i] = QtFontFamily::UnsupportedFT;
            else
                family->writingSystems[i] = QtFontFamily::Supported;
        }
        family->writingSystems[QFontDatabase::Other] = QtFontFamily::UnsupportedFT;

        QtFontStyle::Key styleKey;
        for (int i = 0; i < 4; ++i) {
            styleKey.style = (i%2) ? QFont::StyleNormal : QFont::StyleItalic;
            styleKey.weight = (i > 1) ? QFont::Bold : QFont::Normal;
            QtFontStyle *style = foundry->style(styleKey, true);
            style->smoothScalable = true;
            QtFontSize *size = style->pixelSize(SMOOTH_SCALABLE, true);
            QtFontEncoding *enc = size->encodingID(-1, 0, 0, 0, 0, true);
            enc->pitch = (f->fixed ? 'm' : 'p');
        }
        ++f;
    }
}
#endif // QT_NO_FONTCONFIG

static void load(const QString &family = QString(), int script = -1)
{
    if (X11->has_fontconfig)
        return;

#ifdef QFONTDATABASE_DEBUG
    QTime t;
    t.start();
#endif

    if (family.isNull() && script == -1) {
        loadXlfds(0, -1);
    } else {
        if (family.isNull()) {
            // load all families in all writing systems that match \a script
            for (int ws = 1; ws < QFontDatabase::WritingSystemsCount; ++ws) {
                if (scriptForWritingSystem[ws] != script)
                    continue;
                for (int i = 0; i < numEncodings; ++i) {
                    if (writingSystems_for_xlfd_encoding[i][ws])
                        loadXlfds(0, i);
                }
            }
        } else {
            QtFontFamily *f = privateDb()->family(family);
            // could reduce this further with some more magic:
            // would need to remember the encodings loaded for the family.
            if (!f || !f->xlfdLoaded)
                loadXlfds(family.toLatin1(), -1);
        }
    }

#ifdef QFONTDATABASE_DEBUG
    FD_DEBUG("QFontDatabase: load(%s, %d) took %d ms",
             family.toLatin1().constData(), script, t.elapsed());
#endif
}

static void initializeDb()
{
    QFontDatabasePrivate *db = privateDb();
    if (!db || db->count)
        return;

    QTime t;
    t.start();

#ifndef QT_NO_FONTCONFIG
    loadFontConfig();
    FD_DEBUG("QFontDatabase: loaded FontConfig: %d ms", t.elapsed());
#endif

    t.start();

#ifndef QT_NO_FONTCONFIG
    for (int i = 0; i < db->count; i++) {
        for (int j = 0; j < db->families[i]->count; ++j) {        // each foundry
            QtFontFoundry *foundry = db->families[i]->foundries[j];
            for (int k = 0; k < foundry->count; ++k) {
                QtFontStyle *style = foundry->styles[k];
                if (style->key.style != QFont::StyleNormal) continue;

                QtFontSize *size = style->pixelSize(SMOOTH_SCALABLE);
                if (! size) continue; // should not happen
                QtFontEncoding *enc = size->encodingID(-1, 0, 0, 0, 0, true);
                if (! enc) continue; // should not happen either

                QtFontStyle::Key key = style->key;

                // does this style have an italic equivalent?
                key.style = QFont::StyleItalic;
                QtFontStyle *equiv = foundry->style(key);
                if (equiv) continue;

                // does this style have an oblique equivalent?
                key.style = QFont::StyleOblique;
                equiv = foundry->style(key);
                if (equiv) continue;

                // let's fake one...
                equiv = foundry->style(key, true);
                equiv->smoothScalable = true;

                QtFontSize *equiv_size = equiv->pixelSize(SMOOTH_SCALABLE, true);
                QtFontEncoding *equiv_enc = equiv_size->encodingID(-1, 0, 0, 0, 0, true);

                // keep the same pitch
                equiv_enc->pitch = enc->pitch;
            }
        }
    }
#endif


#ifdef QFONTDATABASE_DEBUG
#ifndef QT_NO_FONTCONFIG
    if (!X11->has_fontconfig)
#endif
        // load everything at startup in debug mode.
        loadXlfds(0, -1);

    // print the database
    for (int f = 0; f < db->count; f++) {
        QtFontFamily *family = db->families[f];
        FD_DEBUG("'%s' %s  hasFT=%s", family->name.latin1(), (family->fixedPitch ? "fixed" : ""),
                 (family->hasFT ? "yes" : "no"));
        for (int i = 0; i < QFontDatabase::WritingSystemsCount; ++i) {
            QFontDatabase::WritingSystem ws = QFontDatabase::WritingSystem(i);
            FD_DEBUG("\t%s: %s", QFontDatabase::writingSystemName(ws).toLatin1().constData(),
                     ((family->writingSystems[i] & QtFontFamily::Supported) ? "Supported" :
                      (family->writingSystems[i] & QtFontFamily::Unsupported) == QtFontFamily::Unsupported ?
                      "Unsupported" : "Unknown"));
        }

        for (int fd = 0; fd < family->count; fd++) {
            QtFontFoundry *foundry = family->foundries[fd];
            FD_DEBUG("\t\t'%s'", foundry->name.latin1());
            for (int s = 0; s < foundry->count; s++) {
                QtFontStyle *style = foundry->styles[s];
                FD_DEBUG("\t\t\tstyle: style=%d weight=%d (%s)\n"
                         "\t\t\tstretch=%d (%s)",
                         style->key.style, style->key.weight,
                         style->weightName, style->key.stretch,
                         style->setwidthName ? style->setwidthName : "nil");
                if (style->smoothScalable)
                    FD_DEBUG("\t\t\t\tsmooth scalable");
                else if (style->bitmapScalable)
                    FD_DEBUG("\t\t\t\tbitmap scalable");
                if (style->pixelSizes) {
                    qDebug("\t\t\t\t%d pixel sizes", style->count);
                    for (int z = 0; z < style->count; ++z) {
                        QtFontSize *size = style->pixelSizes + z;
                        for (int e = 0; e < size->count; ++e) {
                            FD_DEBUG("\t\t\t\t  size %5d pitch %c encoding %s",
                                     size->pixelSize,
                                     size->encodings[e].pitch,
                                     xlfd_for_id(size->encodings[e].encoding));
                        }
                    }
                }
            }
        }
    }
#endif // QFONTDATABASE_DEBUG
}


// --------------------------------------------------------------------------------------
// font loader
// --------------------------------------------------------------------------------------

static const char *styleHint(const QFontDef &request)
{
    const char *stylehint = 0;
    switch (request.styleHint) {
    case QFont::SansSerif:
        stylehint = "sans-serif";
        break;
    case QFont::Serif:
        stylehint = "serif";
        break;
    case QFont::TypeWriter:
        stylehint = "monospace";
        break;
    default:
        if (request.fixedPitch)
            stylehint = "monospace";
        break;
    }
    return stylehint;
}

#ifndef QT_NO_FONTCONFIG

static void addPatternProps(FcPattern *pattern, const QFontPrivate *fp, int script, const QFontDef &request)
{