Ejemplo n.º 1
0
UScriptCode getScript(int ucs4) {
  UErrorCode err = U_ZERO_ERROR;
  UScriptCode script = uscript_getScript(ucs4, &err);
  // If script is invalid, common or inherited or there's an error,
  // infer a script based on the unicode block of a character.
  if (script <= USCRIPT_INHERITED || U_FAILURE(err))
    script = getScriptBasedOnUnicodeBlock(ucs4);
  return script;
}
Ejemplo n.º 2
0
// FIXME:
//  - Handle 'Inherited', 'Common' and 'Unknown'
//    (see http://www.unicode.org/reports/tr24/#Usage_Model )
//    For 'Inherited' and 'Common', perhaps we need to
//    accept another parameter indicating the previous family
//    and just return it.
//  - All the characters (or characters up to the point a single
//    font can cover) need to be taken into account
const UChar* getFallbackFamily(UChar32 character,
    FontDescription::GenericFamilyType generic,
    UScriptCode contentScript,
    const AtomicString& contentLocale,
    UScriptCode* scriptChecked,
    SkFontMgr* fontManager)
{
    ASSERT(character);
    ASSERT(fontManager);
    const UChar* family = getFontBasedOnUnicodeBlock(character, fontManager);
    if (family) {
        if (scriptChecked)
            *scriptChecked = USCRIPT_INVALID_CODE;
        return family;
    }

    UScriptCode script = getScript(character);

    // For the full-width ASCII characters (U+FF00 - U+FF5E), use the font for
    // Han (determined in a locale-dependent way above). Full-width ASCII
    // characters are rather widely used in Japanese and Chinese documents and
    // they're fully covered by Chinese, Japanese and Korean fonts.
    if (0xFF00 < character && character < 0xFF5F)
        script = USCRIPT_HAN;

    if (script == USCRIPT_COMMON)
        script = getScriptBasedOnUnicodeBlock(character);

    // For unified-Han scripts, try the lang attribute.
    if (script == USCRIPT_HAN) {
        if (isUnambiguousUnifiedHanScript(contentScript))
            script = contentScript;
        else
            script = scriptCodeForUnifiedHanFromSubtags(contentLocale);
    }

    family = getFontFamilyForScript(script, generic, fontManager);
    // Another lame work-around to cover non-BMP characters.
    // If the font family for script is not found or the character is
    // not in BMP (> U+FFFF), we resort to the hard-coded list of
    // fallback fonts for now.
    if (!family || character > 0xFFFF) {
        int plane = character >> 16;
        switch (plane) {
        case 1:
            family = L"code2001";
            break;
        case 2:
            // Use a Traditional Chinese ExtB font if in Traditional Chinese locale.
            // Otherwise, use a Simplified Chinese ExtB font. Windows Japanese
            // fonts do support a small subset of ExtB (that are included in JIS X 0213),
            // but its coverage is rather sparse.
            // Eventually, this should be controlled by lang/xml:lang.
            if (icu::Locale::getDefault() == icu::Locale::getTraditionalChinese())
                family = L"pmingliu-extb";
            else
                family = L"simsun-extb";
            break;
        default:
            family = L"lucida sans unicode";
        }
    }