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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 "DocumentRuleSets.h"
#include "ElementChildIterator.h"
#include "SpaceSplitString.h"
#include "StyleInvalidationAnalysis.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);
// 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());
}
for (unsigned i = 0; i < oldSize; ++i) {
// If the bit is not set the the corresponding class has been removed.
if (remainingClassBits.quickGet(i))
continue;
changedClasses.append(oldClasses[i].impl());
}
return changedClasses;
}
void ClassChangeInvalidation::invalidateStyle(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses)
{
auto changedClasses = computeClassChange(oldClasses, newClasses);
auto& ruleSets = m_element.styleResolver().ruleSets();
ClassChangeVector changedClassesAffectingStyle;
for (auto* changedClass : changedClasses) {
if (ruleSets.features().classesInRules.contains(changedClass))
changedClassesAffectingStyle.append(changedClass);
};
if (changedClassesAffectingStyle.isEmpty())
return;
if (m_element.shadowRoot() && ruleSets.authorStyle()->hasShadowPseudoElementRules()) {
m_element.setNeedsStyleRecalc(FullStyleChange);
return;
}
m_element.setNeedsStyleRecalc(InlineStyleChange);
if (!childrenOfType<Element>(m_element).first())
return;
for (auto* changedClass : changedClassesAffectingStyle) {
auto* ancestorClassRules = ruleSets.ancestorClassRules(changedClass);
if (!ancestorClassRules)
continue;
m_descendantInvalidationRuleSets.append(ancestorClassRules);
}
}
void ClassChangeInvalidation::invalidateDescendantStyle()
{
for (auto* ancestorClassRules : m_descendantInvalidationRuleSets) {
StyleInvalidationAnalysis invalidationAnalysis(*ancestorClassRules);
invalidationAnalysis.invalidateStyle(m_element);
}
}
}
}
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