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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ClassChangeInvalidation.h"
#include "ElementChildIterator.h"
#include "SpaceSplitString.h"
#include "StyleInvalidationFunctions.h"
#include <wtf/BitVector.h>
namespace WebCore {
namespace Style {
enum class ClassChangeType : bool { Add, Remove };
struct ClassChange {
AtomStringImpl* className { };
ClassChangeType type;
};
using ClassChangeVector = Vector<ClassChange, 4>;
static ClassChangeVector collectClasses(const SpaceSplitString& classes, ClassChangeType changeType)
{
ClassChangeVector result;
result.reserveCapacity(classes.size());
for (unsigned i = 0; i < classes.size(); ++i)
result.uncheckedAppend({ classes[i].impl(), changeType });
return result;
}
static ClassChangeVector computeClassChanges(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses)
{
unsigned oldSize = oldClasses.size();
unsigned newSize = newClasses.size();
if (!oldSize)
return collectClasses(newClasses, ClassChangeType::Add);
if (!newSize)
return collectClasses(oldClasses, ClassChangeType::Remove);
ClassChangeVector changedClasses;
BitVector remainingClassBits;
remainingClassBits.ensureSize(oldSize);
// Class vectors tend to be very short. This is faster than using a hash table.
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(), ClassChangeType::Add });
}
for (unsigned i = 0; i < oldSize; ++i) {
// If the bit is not set the corresponding class has been removed.
if (remainingClassBits.quickGet(i))
continue;
changedClasses.append({ oldClasses[i].impl(), ClassChangeType::Remove });
}
return changedClasses;
}
void ClassChangeInvalidation::computeInvalidation(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses)
{
auto classChanges = computeClassChanges(oldClasses, newClasses);
bool shouldInvalidateCurrent = false;
bool mayAffectStyleInShadowTree = false;
traverseRuleFeatures(m_element, [&] (const RuleFeatureSet& features, bool mayAffectShadowTree) {
for (auto& classChange : classChanges) {
if (mayAffectShadowTree && features.classRules.contains(classChange.className))
mayAffectStyleInShadowTree = true;
if (features.classesAffectingHost.contains(classChange.className))
shouldInvalidateCurrent = true;
}
});
if (mayAffectStyleInShadowTree) {
// FIXME: We should do fine-grained invalidation for shadow tree.
m_element.invalidateStyleForSubtree();
}
if (shouldInvalidateCurrent)
m_element.invalidateStyle();
auto& ruleSets = m_element.styleResolver().ruleSets();
auto invalidateBeforeChange = [](ClassChangeType type, IsNegation isNegation) {
if (type == ClassChangeType::Remove)
return isNegation == IsNegation::No;
return isNegation == IsNegation::Yes;
};
for (auto& classChange : classChanges) {
if (auto* invalidationRuleSets = ruleSets.classInvalidationRuleSets(classChange.className)) {
for (auto& invalidationRuleSet : *invalidationRuleSets) {
if (invalidateBeforeChange(classChange.type, invalidationRuleSet.isNegation))
Invalidator::addToMatchElementRuleSets(m_beforeChangeRuleSets, invalidationRuleSet);
else
Invalidator::addToMatchElementRuleSets(m_afterChangeRuleSets, invalidationRuleSet);
}
}
}
}
void ClassChangeInvalidation::invalidateBeforeChange()
{
Invalidator::invalidateWithMatchElementRuleSets(m_element, m_beforeChangeRuleSets);
}
void ClassChangeInvalidation::invalidateAfterChange()
{
Invalidator::invalidateWithMatchElementRuleSets(m_element, m_afterChangeRuleSets);
}
}
}