MutableStylePropertySet* CanvasFontCache::parseFont(const String& fontString)
{
MutableStylePropertySet* parsedStyle;
MutableStylePropertyMap::iterator i = m_fetchedFonts.find(fontString);
if (i != m_fetchedFonts.end()) {
ASSERT(m_fontLRUList.contains(fontString));
parsedStyle = i->value;
m_fontLRUList.remove(fontString);
m_fontLRUList.add(fontString);
} else {
parsedStyle = MutableStylePropertySet::create(HTMLStandardMode);
CSSParser::parseValue(parsedStyle, CSSPropertyFont, fontString, true, 0);
if (parsedStyle->isEmpty())
return nullptr;
// According to http://lists.w3.org/Archives/Public/public-html/2009Jul/0947.html,
// the "inherit" and "initial" values must be ignored.
CSSValue* fontValue = parsedStyle->getPropertyCSSValue(CSSPropertyFontSize);
if (fontValue && (fontValue->isInitialValue() || fontValue->isInheritedValue()))
return nullptr;
m_fetchedFonts.add(fontString, parsedStyle);
m_fontLRUList.add(fontString);
// Hard limit is applied here, on the fly, while the soft limit is
// applied at the end of the task.
if (m_fetchedFonts.size() > hardMaxFonts()) {
ASSERT(m_fetchedFonts.size() == hardMaxFonts() + 1);
ASSERT(m_fontLRUList.size() == hardMaxFonts() + 1);
m_fetchedFonts.remove(m_fontLRUList.first());
m_fontsResolvedUsingDefaultStyle.remove(m_fontLRUList.first());
m_fontLRUList.removeFirst();
}
}
schedulePruningIfNeeded();
return parsedStyle;
}
bool FontFaceSet::resolveFontStyle(const String& fontString, Font& font) {
if (fontString.isEmpty())
return false;
// Interpret fontString in the same way as the 'font' attribute of
// CanvasRenderingContext2D.
MutableStylePropertySet* parsedStyle =
MutableStylePropertySet::create(HTMLStandardMode);
CSSParser::parseValue(parsedStyle, CSSPropertyFont, fontString, true, 0);
if (parsedStyle->isEmpty())
return false;
String fontValue = parsedStyle->getPropertyValue(CSSPropertyFont);
if (fontValue == "inherit" || fontValue == "initial")
return false;
RefPtr<ComputedStyle> style = ComputedStyle::create();
FontFamily fontFamily;
fontFamily.setFamily(defaultFontFamily);
FontDescription defaultFontDescription;
defaultFontDescription.setFamily(fontFamily);
defaultFontDescription.setSpecifiedSize(defaultFontSize);
defaultFontDescription.setComputedSize(defaultFontSize);
style->setFontDescription(defaultFontDescription);
style->font().update(style->font().getFontSelector());
document()->ensureStyleResolver().computeFont(style.get(), *parsedStyle);
font = style->font();
font.update(document()->styleEngine().fontSelector());
return true;
}
