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