ClassChangeInvalidation.cpp [plain text]
#include "config.h"
#include "ClassChangeInvalidation.h"
#include "ElementChildIterator.h"
#include "SpaceSplitString.h"
#include "StyleInvalidationFunctions.h"
#include "StyleInvalidator.h"
#include <wtf/BitVector.h>
namespace WebCore {
namespace Style {
using ClassChangeVector = Vector<AtomicStringImpl*, 4>;
static ClassChangeVector collectClasses(const SpaceSplitString& classes)
{
ClassChangeVector result;
result.reserveCapacity(classes.size());
for (unsigned i = 0; i < classes.size(); ++i)
result.uncheckedAppend(classes[i].impl());
return result;
}
static ClassChangeVector computeClassChange(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses)
{
unsigned oldSize = oldClasses.size();
unsigned newSize = newClasses.size();
if (!oldSize)
return collectClasses(newClasses);
if (!newSize)
return collectClasses(oldClasses);
ClassChangeVector changedClasses;
BitVector remainingClassBits;
remainingClassBits.ensureSize(oldSize);
for (unsigned i = 0; i < newSize; ++i) {
bool foundFromBoth = false;
for (unsigned j = 0; j < oldSize; ++j) {
if (newClasses[i] == oldClasses[j]) {
remainingClassBits.quickSet(j);
foundFromBoth = true;
}
}
if (foundFromBoth)
continue;
changedClasses.append(newClasses[i].impl());
}
for (unsigned i = 0; i < oldSize; ++i) {
if (remainingClassBits.quickGet(i))
continue;
changedClasses.append(oldClasses[i].impl());
}
return changedClasses;
}
void ClassChangeInvalidation::computeInvalidation(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses)
{
auto changedClasses = computeClassChange(oldClasses, newClasses);
bool shouldInvalidateCurrent = false;
bool mayAffectStyleInShadowTree = false;
traverseRuleFeatures(m_element, [&] (const RuleFeatureSet& features, bool mayAffectShadowTree) {
for (auto* changedClass : changedClasses) {
if (mayAffectShadowTree && features.classRules.contains(changedClass))
mayAffectStyleInShadowTree = true;
if (features.classesAffectingHost.contains(changedClass))
shouldInvalidateCurrent = true;
}
});
if (mayAffectStyleInShadowTree) {
m_element.invalidateStyleForSubtree();
}
if (shouldInvalidateCurrent)
m_element.invalidateStyle();
auto& ruleSets = m_element.styleResolver().ruleSets();
for (auto* changedClass : changedClasses) {
if (auto* invalidationRuleSets = ruleSets.classInvalidationRuleSets(changedClass)) {
for (auto& invalidationRuleSet : *invalidationRuleSets)
m_invalidationRuleSets.append(&invalidationRuleSet);
}
}
}
void ClassChangeInvalidation::invalidateStyleWithRuleSets()
{
for (auto* invalidationRuleSet : m_invalidationRuleSets) {
Invalidator invalidator(*invalidationRuleSet->ruleSet);
invalidator.invalidateStyleWithMatchElement(m_element, invalidationRuleSet->matchElement);
}
}
}
}