QStringList QFontconfigDatabase::fallbacksForFamily(const QString family, const QFont::Style &style, const QFont::StyleHint &styleHint, const QUnicodeTables::Script &script) const
{
QStringList fallbackFamilies;
FcPattern *pattern = FcPatternCreate();
if (!pattern)
return fallbackFamilies;
FcValue value;
value.type = FcTypeString;
QByteArray cs = family.toUtf8();
value.u.s = (const FcChar8 *)cs.data();
FcPatternAdd(pattern,FC_FAMILY,value,true);
int slant_value = FC_SLANT_ROMAN;
if (style == QFont::StyleItalic)
slant_value = FC_SLANT_ITALIC;
else if (style == QFont::StyleOblique)
slant_value = FC_SLANT_OBLIQUE;
FcPatternAddInteger(pattern, FC_SLANT, slant_value);
if (script != QUnicodeTables::Common && *specialLanguages[script] != '\0') {
Q_ASSERT(script < QUnicodeTables::ScriptCount);
FcLangSet *ls = FcLangSetCreate();
FcLangSetAdd(ls, (const FcChar8*)specialLanguages[script]);
FcPatternAddLangSet(pattern, FC_LANG, ls);
FcLangSetDestroy(ls);
}
const char *stylehint = getFcFamilyForStyleHint(styleHint);
if (stylehint) {
value.u.s = (const FcChar8 *)stylehint;
FcPatternAddWeak(pattern, FC_FAMILY, value, FcTrue);
}
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
FcResult result = FcResultMatch;
FcFontSet *fontSet = FcFontSort(0,pattern,FcFalse,0,&result);
FcPatternDestroy(pattern);
if (fontSet)
{
for (int i = 0; i < fontSet->nfont; i++) {
FcChar8 *value = 0;
if (FcPatternGetString(fontSet->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
continue;
// capitalize(value);
QString familyName = QString::fromUtf8((const char *)value);
if (!fallbackFamilies.contains(familyName,Qt::CaseInsensitive)) {
fallbackFamilies << familyName;
}
}
FcFontSetDestroy(fontSet);
}
// qDebug() << "fallbackFamilies for:" << family << fallbackFamilies;
return fallbackFamilies;
}
QStringList QFontconfigDatabase::fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const
{
QStringList fallbackFamilies;
FcPattern *pattern = FcPatternCreate();
if (!pattern)
return fallbackFamilies;
FcValue value;
value.type = FcTypeString;
QByteArray cs = family.toUtf8();
value.u.s = (const FcChar8 *)cs.data();
FcPatternAdd(pattern,FC_FAMILY,value,true);
int slant_value = FC_SLANT_ROMAN;
if (style == QFont::StyleItalic)
slant_value = FC_SLANT_ITALIC;
else if (style == QFont::StyleOblique)
slant_value = FC_SLANT_OBLIQUE;
FcPatternAddInteger(pattern, FC_SLANT, slant_value);
Q_ASSERT(uint(script) < QChar::ScriptCount);
if (*specialLanguages[script] != '\0') {
FcLangSet *ls = FcLangSetCreate();
FcLangSetAdd(ls, (const FcChar8*)specialLanguages[script]);
FcPatternAddLangSet(pattern, FC_LANG, ls);
FcLangSetDestroy(ls);
} else if (!family.isEmpty()) {
// If script is Common or Han, then it may include languages like CJK,
// we should attach system default language set to the pattern
// to obtain correct font fallback list (i.e. if LANG=zh_CN
// then we normally want to use a Chinese font for CJK text;
// while a Japanese font should be used for that if LANG=ja)
FcPattern *dummy = FcPatternCreate();
FcDefaultSubstitute(dummy);
FcChar8 *lang = 0;
FcResult res = FcPatternGetString(dummy, FC_LANG, 0, &lang);
if (res == FcResultMatch)
FcPatternAddString(pattern, FC_LANG, lang);
FcPatternDestroy(dummy);
}
const char *stylehint = getFcFamilyForStyleHint(styleHint);
if (stylehint) {
value.u.s = (const FcChar8 *)stylehint;
FcPatternAddWeak(pattern, FC_FAMILY, value, FcTrue);
}
FcConfigSubstitute(0, pattern, FcMatchPattern);
FcDefaultSubstitute(pattern);
FcResult result = FcResultMatch;
FcFontSet *fontSet = FcFontSort(0,pattern,FcFalse,0,&result);
FcPatternDestroy(pattern);
if (fontSet) {
for (int i = 0; i < fontSet->nfont; i++) {
FcChar8 *value = 0;
if (FcPatternGetString(fontSet->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
continue;
// capitalize(value);
QString familyName = QString::fromUtf8((const char *)value);
if (!fallbackFamilies.contains(familyName,Qt::CaseInsensitive) &&
familyName.compare(family, Qt::CaseInsensitive)) {
fallbackFamilies << familyName;
}
}
FcFontSetDestroy(fontSet);
}
// qDebug() << "fallbackFamilies for:" << family << style << styleHint << script << fallbackFamilies;
return fallbackFamilies;
}
