FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family)
{
const char* name = 0;
CString nameString; // Keeps name valid within scope of this function in case that name is from a family.
// If a fallback font is being created (e.g. "-webkit-monospace"), convert
// it in to the fallback name (e.g. "monospace").
if (!family.length() || family.startsWith("-webkit-"))
name = getFallbackFontName(fontDescription);
else {
nameString = family.string().utf8();
name = nameString.data();
}
int style = SkTypeface::kNormal;
if (fontDescription.weight() >= FontWeightBold)
style |= SkTypeface::kBold;
if (fontDescription.italic())
style |= SkTypeface::kItalic;
SkTypeface* typeface = 0;
FontPlatformData* result = 0;
FallbackScripts fallbackScript = SkGetFallbackScriptFromID(name);
if (SkTypeface_ValidScript(fallbackScript)) {
typeface = SkCreateTypefaceForScript(fallbackScript);
if (typeface)
result = new FontPlatformData(typeface, name, fontDescription.computedSize(),
(style & SkTypeface::kBold) && !typeface->isBold(),
(style & SkTypeface::kItalic) && !typeface->isItalic(),
fontDescription.orientation());
} else {
typeface = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
// CreateFromName always returns a typeface, falling back to a default font
// if the one requested could not be found. Calling Equal() with a null
// pointer will compare the returned font against the default, with the
// caveat that the default is always of normal style. When that happens,
// ignore the default font and allow WebCore to provide the next font on the
// CSS fallback list. The only exception to this occurs when the family name
// is a commonly used generic family, which is the case when called by
// getSimilarFontPlatformData() or getLastResortFallbackFont(). In that case
// the default font is an acceptable result.
if (!SkTypeface::Equal(typeface, 0) || isFallbackFamily(family.string())) {
// We had to use normal styling to see if this was a default font. If
// we need bold or italic, replace with the corrected typeface.
if (style != SkTypeface::kNormal) {
typeface->unref();
typeface = SkTypeface::CreateFromName(name, static_cast<SkTypeface::Style>(style));
}
result = new FontPlatformData(typeface, name, fontDescription.computedSize(),
(style & SkTypeface::kBold) && !typeface->isBold(),
(style & SkTypeface::kItalic) && !typeface->isItalic(),
fontDescription.orientation());
}
}
SkSafeUnref(typeface);
return result;
}
SkTypeface* SkCreateTypefaceForScript(FallbackScripts script) {
if (!SkTypeface_ValidScript(script)) {
return NULL;
}
// ensure that our table is populated
initFBScriptInfo();
FBScriptInfo& scriptInfo = gFBScriptInfo[script];
// ensure the element with that index actually maps to the correct script
SkASSERT(scriptInfo.fScript == script);
// if a suitable script could not be found then return NULL
if (scriptInfo.fFontID == 0) {
return NULL;
}
SkAutoMutexAcquire ac(gFamilyHeadAndNameListMutex);
// retrieve the typeface the corresponds to this fontID
SkTypeface* tf = find_from_uniqueID(scriptInfo.fFontID);
// we ref(), since the semantic is to return a new instance
tf->ref();
return tf;
}
