void cleanCache(TimerBase* timer) {
DCHECK_EQ(timer, &m_cleanTimer);
unsigned hitCount = m_hitCount;
m_hitCount = 0;
if (hitCount > minimumPresentationAttributeCacheHitCountPerMinute)
return;
presentationAttributeCache().clear();
}
void StyledElement::rebuildPresentationAttributeStyle()
{
PresentationAttributeCacheKey cacheKey;
makePresentationAttributeCacheKey(cacheKey);
unsigned cacheHash = computePresentationAttributeCacheHash(cacheKey);
PresentationAttributeCache::iterator cacheIterator;
if (cacheHash) {
cacheIterator = presentationAttributeCache().add(cacheHash, nullptr).iterator;
if (cacheIterator->value && cacheIterator->value->key != cacheKey)
cacheHash = 0;
} else
cacheIterator = presentationAttributeCache().end();
RefPtr<StyleProperties> style;
if (cacheHash && cacheIterator->value) {
style = cacheIterator->value->value;
presentationAttributeCacheCleaner().didHitPresentationAttributeCache();
} else {
style = MutableStyleProperties::create(isSVGElement() ? SVGAttributeMode : CSSQuirksMode);
for (const Attribute& attribute : attributesIterator())
collectStyleForPresentationAttribute(attribute.name(), attribute.value(), static_cast<MutableStyleProperties&>(*style));
}
// ShareableElementData doesn't store presentation attribute style, so make sure we have a UniqueElementData.
UniqueElementData& elementData = ensureUniqueElementData();
elementData.setPresentationAttributeStyleIsDirty(false);
elementData.m_presentationAttributeStyle = style->isEmpty() ? 0 : style;
if (!cacheHash || cacheIterator->value)
return;
std::unique_ptr<PresentationAttributeCacheEntry> newEntry = std::make_unique<PresentationAttributeCacheEntry>();
newEntry->key = cacheKey;
newEntry->value = style.release();
static const int presentationAttributeCacheMaximumSize = 4096;
if (presentationAttributeCache().size() > presentationAttributeCacheMaximumSize) {
// Start building from scratch if the cache ever gets big.
presentationAttributeCache().clear();
presentationAttributeCache().set(cacheHash, WTF::move(newEntry));
} else
cacheIterator->value = WTF::move(newEntry);
}
void cleanCache(Timer<PresentationAttributeCacheCleaner>* timer)
{
ASSERT_UNUSED(timer, timer == &m_cleanTimer);
unsigned hitCount = m_hitCount;
m_hitCount = 0;
if (hitCount > minimumPresentationAttributeCacheHitCountPerMinute)
return;
presentationAttributeCache().clear();
}
void didHitPresentationAttributeCache()
{
if (presentationAttributeCache().size() < minimumPresentationAttributeCacheSizeForCleaning)
return;
m_hitCount++;
if (!m_cleanTimer.isActive())
m_cleanTimer.startOneShot(presentationAttributeCacheCleanTimeInSeconds);
}
