RefPtr<Font> FontCache::systemFallbackForCharacters(const FontDescription& description, const Font* originalFontData, bool, const UChar* characters, unsigned length)
{
RefPtr<FcPattern> pattern = createFontConfigPatternForCharacters(characters, length);
const FontPlatformData& fontData = originalFontData->platformData();
RefPtr<FcPattern> fallbackPattern = findBestFontGivenFallbacks(fontData, pattern.get());
if (fallbackPattern) {
FontPlatformData alternateFontData(fallbackPattern.get(), description);
return fontForPlatformData(alternateFontData);
}
auto addResult = systemFallbackMap().add(FcPatternHash(pattern.get()), nullptr);
auto& resultPattern = addResult.iterator->value;
if (addResult.isNewEntry) {
FcResult fontConfigResult;
resultPattern = adoptRef(FcFontMatch(nullptr, pattern.get(), &fontConfigResult));
}
if (!resultPattern)
return nullptr;
FontPlatformData alternateFontData(resultPattern.get(), description);
return fontForPlatformData(alternateFontData);
}
long fcpattern_hash(value v)
{
long hash = 0;
hash += FcPatternHash(FcPattern_val(v));
return hash;
}