SimpleFontData* FontCache::getCachedFontData(const FontPlatformData* platformData)
{
if (!platformData)
return 0;
if (!gFontDataCache) {
gFontDataCache = new FontDataCache;
gInactiveFontData = new InactiveFontDataHashSet;
}
FontDataCache::iterator result = gFontDataCache->find(*platformData);
if (result == gFontDataCache->end()) {
if (gInactiveFontData->size() > cMaxInactiveFontData)
purgeInactiveFontData((int)(cMaxInactiveFontData * cInactiveFontDataPurgeRatio));
pair<SimpleFontData*, unsigned> newValue(new SimpleFontData(*platformData), 1);
// 6/15/09 CSidhall -Moved the add ref into the constructor of SimpleFontData
gFontDataCache->set(*platformData, newValue);
return newValue.first;
}
if (!result.get()->second.second++) {
if(gInactiveFontData->contains(result.get()->second.first))
gInactiveFontData->remove(result.get()->second.first);
}
return result.get()->second.first;
}
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::purgeInactiveFontDataIfNeeded()
{
bool underMemoryPressure = MemoryPressureHandler::singleton().isUnderMemoryPressure();
unsigned inactiveFontDataLimit = underMemoryPressure ? cMaxUnderMemoryPressureInactiveFontData : cMaxInactiveFontData;
if (cachedFonts().size() < inactiveFontDataLimit)
return;
unsigned inactiveCount = inactiveFontCount();
if (inactiveCount <= inactiveFontDataLimit)
return;
unsigned targetFontDataLimit = underMemoryPressure ? cTargetUnderMemoryPressureInactiveFontData : cTargetInactiveFontData;
purgeInactiveFontData(inactiveCount - targetFontDataLimit);
}