void FontCache::invalidate()
{
if (!gClients) {
ASSERT(fontPlatformDataCache().isEmpty());
return;
}
fontPlatformDataCache().clear();
#if ENABLE(OPENTYPE_VERTICAL)
fontVerticalDataCache().clear();
#endif
invalidateFontCascadeCache();
gGeneration++;
Vector<Ref<FontSelector>> clients;
clients.reserveInitialCapacity(gClients->size());
for (auto it = gClients->begin(), end = gClients->end(); it != end; ++it)
clients.uncheckedAppend(**it);
for (unsigned i = 0; i < clients.size(); ++i)
clients[i]->fontCacheInvalidated();
purgeInactiveFontData();
}
void FontCache::purgeInactiveFontData(unsigned purgeCount)
{
pruneUnreferencedEntriesFromFontCascadeCache();
pruneSystemFallbackFonts();
#if PLATFORM(IOS)
FontLocker fontLocker;
#endif
while (purgeCount) {
Vector<RefPtr<Font>, 20> fontsToDelete;
for (auto& font : cachedFonts().values()) {
if (!font->hasOneRef())
continue;
fontsToDelete.append(WTF::move(font));
if (!--purgeCount)
break;
}
// Fonts may ref other fonts so we loop until there are no changes.
if (fontsToDelete.isEmpty())
break;
for (auto& font : fontsToDelete)
cachedFonts().remove(font->platformData());
};
Vector<FontPlatformDataCacheKey> keysToRemove;
keysToRemove.reserveInitialCapacity(fontPlatformDataCache().size());
for (auto& entry : fontPlatformDataCache()) {
if (entry.value && !cachedFonts().contains(*entry.value))
keysToRemove.append(entry.key);
}
for (auto key : keysToRemove)
fontPlatformDataCache().remove(key);
#if ENABLE(OPENTYPE_VERTICAL)
FontVerticalDataCache& fontVerticalDataCache = fontVerticalDataCacheInstance();
if (!fontVerticalDataCache.isEmpty()) {
// Mark & sweep unused verticalData
for (auto& verticalData : fontVerticalDataCache.values()) {
if (verticalData)
verticalData->m_inFontCache = false;
}
for (auto& font : cachedFonts().values()) {
auto* verticalData = const_cast<OpenTypeVerticalData*>(font->verticalData());
if (verticalData)
verticalData->m_inFontCache = true;
}
Vector<FontFileKey> keysToRemove;
keysToRemove.reserveInitialCapacity(fontVerticalDataCache.size());
for (auto& it : fontVerticalDataCache) {
if (!it.value || !it.value->m_inFontCache)
keysToRemove.append(it.key);
}
for (auto& key : keysToRemove)
fontVerticalDataCache.remove(key);
}
#endif
platformPurgeInactiveFontData();
}
FontPlatformData* FontCache::getCachedFontPlatformData(const FontDescription& fontDescription,
const AtomicString& passedFamilyName,
bool checkingAlternateName)
{
#if PLATFORM(IOS)
FontLocker fontLocker;
#endif
#if OS(WINDOWS) && ENABLE(OPENTYPE_VERTICAL)
// Leading "@" in the font name enables Windows vertical flow flag for the font.
// Because we do vertical flow by ourselves, we don't want to use the Windows feature.
// IE disregards "@" regardless of the orientatoin, so we follow the behavior.
const AtomicString& familyName = (passedFamilyName.isEmpty() || passedFamilyName[0] != '@') ?
passedFamilyName : AtomicString(passedFamilyName.impl()->substring(1));
#else
const AtomicString& familyName = passedFamilyName;
#endif
static bool initialized;
if (!initialized) {
platformInit();
initialized = true;
}
FontPlatformDataCacheKey key(familyName, fontDescription);
auto addResult = fontPlatformDataCache().add(key, nullptr);
FontPlatformDataCache::iterator it = addResult.iterator;
if (addResult.isNewEntry) {
it->value = createFontPlatformData(fontDescription, familyName);
if (!it->value && !checkingAlternateName) {
// We were unable to find a font. We have a small set of fonts that we alias to other names,
// e.g., Arial/Helvetica, Courier/Courier New, etc. Try looking up the font under the aliased name.
const AtomicString alternateName = alternateFamilyName(familyName);
if (!alternateName.isNull()) {
FontPlatformData* fontPlatformDataForAlternateName = getCachedFontPlatformData(fontDescription, alternateName, true);
// Lookup the key in the hash table again as the previous iterator may have
// been invalidated by the recursive call to getCachedFontPlatformData().
it = fontPlatformDataCache().find(key);
ASSERT(it != fontPlatformDataCache().end());
if (fontPlatformDataForAlternateName)
it->value = std::make_unique<FontPlatformData>(*fontPlatformDataForAlternateName);
}
}
}
return it->value.get();
}
void FontCache::purgeInactiveFontData(unsigned purgeCount)
{
pruneUnreferencedEntriesFromFontCascadeCache();
pruneSystemFallbackFonts();
#if PLATFORM(IOS)
FontLocker fontLocker;
#endif
while (purgeCount) {
Vector<RefPtr<Font>, 20> fontsToDelete;
for (auto& font : cachedFonts().values()) {
if (!font->hasOneRef())
continue;
fontsToDelete.append(WTFMove(font));
if (!--purgeCount)
break;
}
// Fonts may ref other fonts so we loop until there are no changes.
if (fontsToDelete.isEmpty())
break;
for (auto& font : fontsToDelete) {
bool success = cachedFonts().remove(font->platformData());
ASSERT_UNUSED(success, success);
#if ENABLE(OPENTYPE_VERTICAL)
fontVerticalDataCache().remove(font->platformData());
#endif
}
};
Vector<FontPlatformDataCacheKey> keysToRemove;
keysToRemove.reserveInitialCapacity(fontPlatformDataCache().size());
for (auto& entry : fontPlatformDataCache()) {
if (entry.value && !cachedFonts().contains(*entry.value))
keysToRemove.append(entry.key);
}
for (auto& key : keysToRemove)
fontPlatformDataCache().remove(key);
platformPurgeInactiveFontData();
}