static FontRanges realizeNextFallback(const FontCascadeDescription& description, unsigned& index, FontSelector* fontSelector)
{
ASSERT(index < description.familyCount());
auto& fontCache = FontCache::singleton();
while (index < description.familyCount()) {
const AtomicString& family = description.familyAt(index++);
if (family.isEmpty())
continue;
if (fontSelector) {
auto ranges = fontSelector->fontRangesForFamily(description, family);
if (!ranges.isNull())
return ranges;
}
if (auto font = fontCache.fontForFamily(description, family))
return FontRanges(WTFMove(font));
}
// We didn't find a font. Try to find a similar font using our own specific knowledge about our platform.
// For example on OS X, we know to map any families containing the words Arabic, Pashto, or Urdu to the
// Geeza Pro font.
for (auto& family : description.families()) {
if (auto font = fontCache.similarFont(description, family))
return FontRanges(WTFMove(font));
}
return { };
}
bool CSSFontSelector::resolvesFamilyFor(const FontCascadeDescription& description) const
{
for (unsigned i = 0; i < description.familyCount(); ++i) {
const AtomicString& familyName = description.familyAt(i);
if (familyName.isEmpty())
continue;
if (m_fontFaces.contains(familyName))
return true;
static NeverDestroyed<String> webkitPrefix("-webkit-");
if (familyName.startsWith(webkitPrefix.get()))
return true;
}
return false;
}
bool FontCascadeDescription::familiesEqualForTextAutoSizing(const FontCascadeDescription& other) const
{
unsigned thisFamilyCount = familyCount();
unsigned otherFamilyCount = other.familyCount();
if (thisFamilyCount != otherFamilyCount)
return false;
for (unsigned i = 0; i < thisFamilyCount; ++i) {
if (!equalIgnoringCase(familyAt(i), other.familyAt(i)))
return false;
}
return true;
}