qfontdatabase_x11.cpp

奇趣公司比较新的qt/emd版本

    if (FcPatternGetInteger(pattern, FC_SPACING, 0, &spacing) == FcResultMatch) {
        fontDef.fixedPitch = (spacing >= FC_MONO);
        fontDef.ignorePitch = false;
    } else {
        fontDef.ignorePitch = true;
    }

    return fontDef;
}

static const char *specialLanguages[] = {
    "en", // Common
    "el", // Greek
    "ru", // Cyrillic
    "hy", // Armenian
    "he", // Hebrew
    "ar", // Arabic
    "syr", // Syriac
    "div", // Thaana
    "hi", // Devanagari
    "bn", // Bengali
    "pa", // Gurmukhi
    "gu", // Gujarati
    "or", // Oriya
    "ta", // Tamil
    "te", // Telugu
    "kn", // Kannada
    "ml", // Malayalam
    "si", // Sinhala
    "th", // Thai
    "lo", // Lao
    "bo", // Tibetan
    "my", // Myanmar
    "ka", // Georgian
    "ko", // Hangul
    "", // Ogham
    "", // Runic
    "km" // Khmer
};
enum { SpecialLanguageCount = sizeof(specialLanguages) / sizeof(const char *) };

static ushort specialChars[] = {
    0, // English
    0, // Greek
    0, // Cyrillic
    0, // Armenian
    0, // Hebrew
    0, // Arabic
    0, // Syriac
    0, // Thaana
    0, // Devanagari
    0, // Bengali
    0, // Gurmukhi
    0, // Gujarati
    0, // Oriya
    0, // Tamil
    0xc15, // Telugu
    0xc95, // Kannada
    0xd15, // Malayalam
    0xd9a, // Sinhala
    0, // Thai
    0, // Lao
    0, // Tibetan
    0x1000, // Myanmar
    0, // Georgian
    0, // Hangul
    0x1681, // Ogham
    0x16a0, // Runic
    0  // Khmer
};
enum { SpecialCharCount = sizeof(specialChars) / sizeof(ushort) };

// this could become a list of all languages used for each writing
// system, instead of using the single most common language.
static const char *languageForWritingSystem[] = {
    0,     // Any
    "en",  // Latin
    "el",  // Greek
    "ru",  // Cyrillic
    "hy",  // Armenian
    "he",  // Hebrew
    "ar",  // Arabic
    "syr", // Syriac
    "div", // Thaana
    "hi",  // Devanagari
    "bn",  // Bengali
    "pa",  // Gurmukhi
    "gu",  // Gujarati
    "or",  // Oriya
    "ta",  // Tamil
    "te",  // Telugu
    "kn",  // Kannada
    "ml",  // Malayalam
    "si",  // Sinhala
    "th",  // Thai
    "lo",  // Lao
    "bo",  // Tibetan
    "my",  // Myanmar
    "ka",  // Georgian
    "km",  // Khmer
    "zh-cn", // SimplifiedChinese
    "zh-tw", // TraditionalChinese
    "ja",  // Japanese
    "ko",  // Korean
    "vi",  // Vietnamese
    0, // Symbol
    0, // Ogham
    0 // Runic
};
enum { LanguageCount = sizeof(languageForWritingSystem) / sizeof(const char *) };

// Unfortunately FontConfig doesn't know about some languages. We have to test these through the
// charset. The lists below contain the systems where we need to do this.
static const ushort sampleCharForWritingSystem[] = {
    0,     // Any
    0,  // Latin
    0,  // Greek
    0,  // Cyrillic
    0,  // Armenian
    0,  // Hebrew
    0,  // Arabic
    0, // Syriac
    0, // Thaana
    0,  // Devanagari
    0,  // Bengali
    0,  // Gurmukhi
    0,  // Gujarati
    0,  // Oriya
    0,  // Tamil
    0xc15,  // Telugu
    0xc95,  // Kannada
    0xd15,  // Malayalam
    0xd9a,  // Sinhala
    0,  // Thai
    0,  // Lao
    0,  // Tibetan
    0x1000,  // Myanmar
    0,  // Georgian
    0,  // Khmer
    0, // SimplifiedChinese
    0, // TraditionalChinese
    0,  // Japanese
    0,  // Korean
    0,  // Vietnamese
    0, // Symbol
    0x1681, // Ogham
    0x16a0 // Runic
};
enum { SampleCharCount = sizeof(sampleCharForWritingSystem) / 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
    0, // Symbol
    0, // Ogham
    0 // Runic
};
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(int(QFontDatabase::WritingSystemsCount) == LanguageCount,
               "QFontDatabase", "New writing systems have been added.");
    Q_ASSERT_X(int(QFontDatabase::WritingSystemsCount) == SampleCharCount,
               "QFontDatabase", "New writing systems have been added.");
    Q_ASSERT_X(int(QFontDatabase::WritingSystemsCount) == 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(QLatin1Char('-'), QLatin1Char(' '));
        familyName.remove(QLatin1Char('/'));
        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;

        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(QLatin1String(f->qtname), true);
        family->fixedPitch = f->fixed;
        family->rawName = QLatin1String(f->rawname);
        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) {