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chromium / chromium / blink / 82f6a9e065c971b22bae66ed53109a1cfdcccbb5 / . / Source / core / css / resolver / StyleResolver.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "core/css/resolver/StyleResolver.h"
#include "CSSPropertyNames.h"
#include "HTMLNames.h"
#include "RuntimeEnabledFeatures.h"
#include "StylePropertyShorthand.h"
#include "core/animation/AnimatableNumber.h"
#include "core/animation/AnimatableValue.h"
#include "core/animation/Animation.h"
#include "core/animation/DocumentTimeline.h"
#include "core/animation/css/CSSAnimatableValueFactory.h"
#include "core/animation/css/CSSAnimations.h"
#include "core/css/CSSCalculationValue.h"
#include "core/css/CSSDefaultStyleSheets.h"
#include "core/css/CSSFontSelector.h"
#include "core/css/CSSKeyframeRule.h"
#include "core/css/CSSKeyframesRule.h"
#include "core/css/CSSParser.h"
#include "core/css/CSSReflectValue.h"
#include "core/css/CSSRuleList.h"
#include "core/css/CSSSelector.h"
#include "core/css/CSSStyleRule.h"
#include "core/css/CSSValueList.h"
#include "core/css/CSSVariableValue.h"
#include "core/css/ElementRuleCollector.h"
#include "core/css/MediaQueryEvaluator.h"
#include "core/css/PageRuleCollector.h"
#include "core/css/RuleSet.h"
#include "core/css/StylePropertySet.h"
#include "core/css/resolver/AnimatedStyleBuilder.h"
#include "core/css/resolver/MatchResult.h"
#include "core/css/resolver/MediaQueryResult.h"
#include "core/css/resolver/SharedStyleFinder.h"
#include "core/css/resolver/StyleAdjuster.h"
#include "core/css/resolver/StyleBuilder.h"
#include "core/css/resolver/ViewportStyleResolver.h"
#include "core/dom/DocumentStyleSheetCollection.h"
#include "core/dom/NodeRenderStyle.h"
#include "core/dom/NodeRenderingContext.h"
#include "core/dom/Text.h"
#include "core/dom/shadow/ContentDistributor.h"
#include "core/dom/shadow/ElementShadow.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLIFrameElement.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/page/Frame.h"
#include "core/page/FrameView.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/style/KeyframeList.h"
#include "core/rendering/style/StyleCustomFilterProgramCache.h"
#include "core/svg/SVGDocumentExtensions.h"
#include "core/svg/SVGElement.h"
#include "core/svg/SVGFontFaceElement.h"
#include "wtf/StdLibExtras.h"
#include "wtf/Vector.h"
using namespace std;
namespace WebCore {
using namespace HTMLNames;
RenderStyle* StyleResolver::s_styleNotYetAvailable;
static StylePropertySet* leftToRightDeclaration()
{
DEFINE_STATIC_LOCAL(RefPtr<MutableStylePropertySet>, leftToRightDecl, (MutableStylePropertySet::create()));
if (leftToRightDecl->isEmpty())
leftToRightDecl->setProperty(CSSPropertyDirection, CSSValueLtr);
return leftToRightDecl.get();
}
static StylePropertySet* rightToLeftDeclaration()
{
DEFINE_STATIC_LOCAL(RefPtr<MutableStylePropertySet>, rightToLeftDecl, (MutableStylePropertySet::create()));
if (rightToLeftDecl->isEmpty())
rightToLeftDecl->setProperty(CSSPropertyDirection, CSSValueRtl);
return rightToLeftDecl.get();
}
StyleResolver::StyleResolver(Document* document, bool matchAuthorAndUserStyles)
: m_document(document)
, m_matchAuthorAndUserStyles(matchAuthorAndUserStyles)
, m_fontSelector(CSSFontSelector::create(document))
, m_viewportStyleResolver(ViewportStyleResolver::create(document))
, m_styleResourceLoader(document->fetcher())
{
Element* root = document->documentElement();
CSSDefaultStyleSheets::initDefaultStyle(root);
// construct document root element default style. this is needed
// to evaluate media queries that contain relative constraints, like "screen and (max-width: 10em)"
// This is here instead of constructor, because when constructor is run,
// document doesn't have documentElement
// NOTE: this assumes that element that gets passed to styleForElement -call
// is always from the document that owns the style selector
FrameView* view = document->view();
if (view)
m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType()));
else
m_medium = adoptPtr(new MediaQueryEvaluator("all"));
if (root)
m_rootDefaultStyle = styleForElement(root, 0, DisallowStyleSharing, MatchOnlyUserAgentRules);
if (m_rootDefaultStyle && view)
m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType(), view->frame(), m_rootDefaultStyle.get()));
m_styleTree.clear();
DocumentStyleSheetCollection* styleSheetCollection = document->styleSheetCollection();
m_ruleSets.initUserStyle(styleSheetCollection, *m_medium, *this);
#if ENABLE(SVG_FONTS)
if (document->svgExtensions()) {
const HashSet<SVGFontFaceElement*>& svgFontFaceElements = document->svgExtensions()->svgFontFaceElements();
HashSet<SVGFontFaceElement*>::const_iterator end = svgFontFaceElements.end();
for (HashSet<SVGFontFaceElement*>::const_iterator it = svgFontFaceElements.begin(); it != end; ++it)
fontSelector()->addFontFaceRule((*it)->fontFaceRule());
}
#endif
styleSheetCollection->appendActiveAuthorStyleSheets(this);
}
void StyleResolver::appendAuthorStyleSheets(unsigned firstNew, const Vector<RefPtr<CSSStyleSheet> >& styleSheets)
{
// This handles sheets added to the end of the stylesheet list only. In other cases the style resolver
// needs to be reconstructed. To handle insertions too the rule order numbers would need to be updated.
unsigned size = styleSheets.size();
for (unsigned i = firstNew; i < size; ++i) {
CSSStyleSheet* cssSheet = styleSheets[i].get();
ASSERT(!cssSheet->disabled());
if (cssSheet->mediaQueries() && !m_medium->eval(cssSheet->mediaQueries(), this))
continue;
StyleSheetContents* sheet = cssSheet->contents();
ScopedStyleResolver* resolver = ensureScopedStyleResolver(ScopedStyleResolver::scopingNodeFor(cssSheet));
ASSERT(resolver);
resolver->addRulesFromSheet(sheet, *m_medium, this);
m_inspectorCSSOMWrappers.collectFromStyleSheetIfNeeded(cssSheet);
}
}
void StyleResolver::finishAppendAuthorStyleSheets()
{
collectFeatures();
if (document()->renderer() && document()->renderer()->style())
document()->renderer()->style()->font().update(fontSelector());
if (RuntimeEnabledFeatures::cssViewportEnabled())
collectViewportRules();
}
void StyleResolver::resetAuthorStyle(const ContainerNode* scopingNode)
{
ScopedStyleResolver* resolver = scopingNode ? m_styleTree.scopedStyleResolverFor(scopingNode) : m_styleTree.scopedStyleResolverForDocument();
if (!resolver)
return;
m_ruleSets.shadowDistributedRules().reset(scopingNode);
resolver->resetAuthorStyle();
if (!scopingNode)
return;
if (scopingNode->isShadowRoot())
resetAtHostRules(scopingNode);
if (!resolver->hasOnlyEmptyRuleSets())
return;
m_styleTree.remove(scopingNode);
}
void StyleResolver::resetAtHostRules(const ContainerNode* scopingNode)
{
ASSERT(scopingNode);
ASSERT(scopingNode->isShadowRoot());
const ShadowRoot* shadowRoot = toShadowRoot(scopingNode);
const ContainerNode* shadowHost = shadowRoot->shadowHost();
ScopedStyleResolver* resolver = m_styleTree.scopedStyleResolverFor(shadowHost);
if (!resolver)
return;
resolver->resetAtHostRules(shadowRoot);
if (!resolver->hasOnlyEmptyRuleSets())
return;
m_styleTree.remove(shadowHost);
}
static PassOwnPtr<RuleSet> makeRuleSet(const Vector<RuleFeature>& rules)
{
size_t size = rules.size();
if (!size)
return nullptr;
OwnPtr<RuleSet> ruleSet = RuleSet::create();
for (size_t i = 0; i < size; ++i)
ruleSet->addRule(rules[i].rule, rules[i].selectorIndex, rules[i].hasDocumentSecurityOrigin ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState);
return ruleSet.release();
}
void StyleResolver::collectFeatures()
{
m_features.clear();
m_ruleSets.collectFeaturesTo(m_features, document()->isViewSource());
m_styleTree.collectFeaturesTo(m_features);
m_siblingRuleSet = makeRuleSet(m_features.siblingRules);
m_uncommonAttributeRuleSet = makeRuleSet(m_features.uncommonAttributeRules);
}
void StyleResolver::pushParentElement(Element* parent)
{
const ContainerNode* parentsParent = parent->parentOrShadowHostElement();
// We are not always invoked consistently. For example, script execution can cause us to enter
// style recalc in the middle of tree building. We may also be invoked from somewhere within the tree.
// Reset the stack in this case, or if we see a new root element.
// Otherwise just push the new parent.
if (!parentsParent || m_selectorFilter.parentStackIsEmpty())
m_selectorFilter.setupParentStack(parent);
else
m_selectorFilter.pushParent(parent);
// Note: We mustn't skip ShadowRoot nodes for the scope stack.
m_styleTree.pushStyleCache(parent, parent->parentOrShadowHostNode());
}
void StyleResolver::popParentElement(Element* parent)
{
// Note that we may get invoked for some random elements in some wacky cases during style resolve.
// Pause maintaining the stack in this case.
if (m_selectorFilter.parentStackIsConsistent(parent))
m_selectorFilter.popParent();
m_styleTree.popStyleCache(parent);
}
void StyleResolver::pushParentShadowRoot(const ShadowRoot* shadowRoot)
{
ASSERT(shadowRoot->host());
m_styleTree.pushStyleCache(shadowRoot, shadowRoot->host());
}
void StyleResolver::popParentShadowRoot(const ShadowRoot* shadowRoot)
{
ASSERT(shadowRoot->host());
m_styleTree.popStyleCache(shadowRoot);
}
// This is a simplified style setting function for keyframe styles
void StyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
{
AtomicString s(rule->name());
m_keyframesRuleMap.set(s.impl(), rule);
}
StyleResolver::~StyleResolver()
{
m_fontSelector->clearDocument();
m_viewportStyleResolver->clearDocument();
}
inline void StyleResolver::matchShadowDistributedRules(ElementRuleCollector& collector, bool includeEmptyRules)
{
// FIXME: Determine tree position.
CascadeScope cascadeScope = ignoreCascadeScope;
if (m_ruleSets.shadowDistributedRules().isEmpty())
return;
bool previousCanUseFastReject = collector.canUseFastReject();
SelectorChecker::BehaviorAtBoundary previousBoundary = collector.behaviorAtBoundary();
collector.setBehaviorAtBoundary(static_cast<SelectorChecker::BehaviorAtBoundary>(SelectorChecker::CrossesBoundary | SelectorChecker::ScopeContainsLastMatchedElement));
collector.setCanUseFastReject(false);
collector.clearMatchedRules();
collector.matchedResult().ranges.lastAuthorRule = collector.matchedResult().matchedProperties.size() - 1;
RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange();
Vector<MatchRequest> matchRequests;
m_ruleSets.shadowDistributedRules().collectMatchRequests(includeEmptyRules, matchRequests);
for (size_t i = 0; i < matchRequests.size(); ++i)
collector.collectMatchingRules(matchRequests[i], ruleRange, cascadeScope);
collector.sortAndTransferMatchedRules();
collector.setBehaviorAtBoundary(previousBoundary);
collector.setCanUseFastReject(previousCanUseFastReject);
}
void StyleResolver::matchHostRules(Element* element, ScopedStyleResolver* resolver, ElementRuleCollector& collector, bool includeEmptyRules)
{
if (element != resolver->scopingNode())
return;
resolver->matchHostRules(collector, includeEmptyRules);
}
static inline bool applyAuthorStylesOf(const Element* element)
{
return element->treeScope()->applyAuthorStyles() || (element->shadow() && element->shadow()->applyAuthorStyles());
}
void StyleResolver::matchScopedAuthorRulesForShadowHost(Element* element, ElementRuleCollector& collector, bool includeEmptyRules, Vector<ScopedStyleResolver*, 8>& resolvers, Vector<ScopedStyleResolver*, 8>& resolversInShadowTree)
{
collector.clearMatchedRules();
collector.matchedResult().ranges.lastAuthorRule = collector.matchedResult().matchedProperties.size() - 1;
CascadeScope cascadeScope = (resolvers.isEmpty() || resolvers.first()->treeScope() != element->treeScope()) ? resolvers.size() + 1 : resolvers.size();
CascadeOrder cascadeOrder = 0;
bool applyAuthorStyles = applyAuthorStylesOf(element);
for (int j = resolversInShadowTree.size() - 1; j >= 0; --j)
resolversInShadowTree.at(j)->collectMatchingAuthorRules(collector, includeEmptyRules, applyAuthorStyles, cascadeScope, cascadeOrder++);
cascadeScope = resolvers.size();
for (unsigned i = 0; i < resolvers.size(); ++i)
resolvers.at(i)->collectMatchingAuthorRules(collector, includeEmptyRules, applyAuthorStyles, cascadeScope--, cascadeOrder);
collector.sortAndTransferMatchedRules();
if (!resolvers.isEmpty())
matchHostRules(element, resolvers.first(), collector, includeEmptyRules);
}
void StyleResolver::matchScopedAuthorRules(Element* element, ElementRuleCollector& collector, bool includeEmptyRules)
{
if (m_styleTree.hasOnlyScopedResolverForDocument()) {
m_styleTree.scopedStyleResolverForDocument()->matchAuthorRules(collector, includeEmptyRules, applyAuthorStylesOf(element));
return;
}
Vector<ScopedStyleResolver*, 8> resolvers;
m_styleTree.resolveScopedStyles(element, resolvers);
Vector<ScopedStyleResolver*, 8> resolversInShadowTree;
m_styleTree.collectScopedResolversForHostedShadowTrees(element, resolversInShadowTree);
if (!resolversInShadowTree.isEmpty()) {
matchScopedAuthorRulesForShadowHost(element, collector, includeEmptyRules, resolvers, resolversInShadowTree);
return;
}
if (resolvers.isEmpty())
return;
bool applyAuthorStyles = applyAuthorStylesOf(element);
CascadeScope cascadeScope = resolvers.size();
collector.clearMatchedRules();
collector.matchedResult().ranges.lastAuthorRule = collector.matchedResult().matchedProperties.size() - 1;
for (unsigned i = 0; i < resolvers.size(); ++i)
resolvers.at(i)->collectMatchingAuthorRules(collector, includeEmptyRules, applyAuthorStyles, cascadeScope--);
collector.sortAndTransferMatchedRules();
matchHostRules(element, resolvers.first(), collector, includeEmptyRules);
}
void StyleResolver::matchAuthorRules(Element* element, ElementRuleCollector& collector, bool includeEmptyRules)
{
matchScopedAuthorRules(element, collector, includeEmptyRules);
matchShadowDistributedRules(collector, includeEmptyRules);
}
void StyleResolver::matchUserRules(ElementRuleCollector& collector, bool includeEmptyRules)
{
if (!m_ruleSets.userStyle())
return;
collector.clearMatchedRules();
collector.matchedResult().ranges.lastUserRule = collector.matchedResult().matchedProperties.size() - 1;
MatchRequest matchRequest(m_ruleSets.userStyle(), includeEmptyRules);
RuleRange ruleRange = collector.matchedResult().ranges.userRuleRange();
collector.collectMatchingRules(matchRequest, ruleRange);
collector.collectMatchingRulesForRegion(matchRequest, ruleRange);
collector.sortAndTransferMatchedRules();
}
void StyleResolver::matchUARules(ElementRuleCollector& collector)
{
collector.setMatchingUARules(true);
// First we match rules from the user agent sheet.
if (CSSDefaultStyleSheets::simpleDefaultStyleSheet)
collector.matchedResult().isCacheable = false;
RuleSet* userAgentStyleSheet = m_medium->mediaTypeMatchSpecific("print")
? CSSDefaultStyleSheets::defaultPrintStyle : CSSDefaultStyleSheets::defaultStyle;
matchUARules(collector, userAgentStyleSheet);
// In quirks mode, we match rules from the quirks user agent sheet.
if (document()->inQuirksMode())
matchUARules(collector, CSSDefaultStyleSheets::defaultQuirksStyle);
// If document uses view source styles (in view source mode or in xml viewer mode), then we match rules from the view source style sheet.
if (document()->isViewSource())
matchUARules(collector, CSSDefaultStyleSheets::viewSourceStyle());
collector.setMatchingUARules(false);
}
void StyleResolver::matchUARules(ElementRuleCollector& collector, RuleSet* rules)
{
collector.clearMatchedRules();
collector.matchedResult().ranges.lastUARule = collector.matchedResult().matchedProperties.size() - 1;
RuleRange ruleRange = collector.matchedResult().ranges.UARuleRange();
collector.collectMatchingRules(MatchRequest(rules), ruleRange);
collector.sortAndTransferMatchedRules();
}
void StyleResolver::matchAllRules(StyleResolverState& state, ElementRuleCollector& collector, bool matchAuthorAndUserStyles, bool includeSMILProperties)
{
matchUARules(collector);
// Now we check user sheet rules.
if (matchAuthorAndUserStyles)
matchUserRules(collector, false);
// Now check author rules, beginning first with presentational attributes mapped from HTML.
if (state.element()->isStyledElement()) {
collector.addElementStyleProperties(state.element()->presentationAttributeStyle());
// Now we check additional mapped declarations.
// Tables and table cells share an additional mapped rule that must be applied
// after all attributes, since their mapped style depends on the values of multiple attributes.
collector.addElementStyleProperties(state.element()->additionalPresentationAttributeStyle());
if (state.element()->isHTMLElement()) {
bool isAuto;
TextDirection textDirection = toHTMLElement(state.element())->directionalityIfhasDirAutoAttribute(isAuto);
if (isAuto)
collector.matchedResult().addMatchedProperties(textDirection == LTR ? leftToRightDeclaration() : rightToLeftDeclaration());
}
}
// Check the rules in author sheets next.
if (matchAuthorAndUserStyles)
matchAuthorRules(state.element(), collector, false);
if (state.element()->isStyledElement()) {
// Now check our inline style attribute.
if (matchAuthorAndUserStyles && state.element()->inlineStyle()) {
// Inline style is immutable as long as there is no CSSOM wrapper.
// FIXME: Media control shadow trees seem to have problems with caching.
bool isInlineStyleCacheable = !state.element()->inlineStyle()->isMutable() && !state.element()->isInShadowTree();
// FIXME: Constify.
collector.addElementStyleProperties(state.element()->inlineStyle(), isInlineStyleCacheable);
}
// Now check SMIL animation override style.
if (includeSMILProperties && matchAuthorAndUserStyles && state.element()->isSVGElement())
collector.addElementStyleProperties(toSVGElement(state.element())->animatedSMILStyleProperties(), false /* isCacheable */);
if (state.element()->hasActiveAnimations())
collector.matchedResult().isCacheable = false;
}
}
bool StyleResolver::styleSharingCandidateMatchesRuleSet(const ElementResolveContext& context, RenderStyle* style, RuleSet* ruleSet)
{
if (!ruleSet)
return false;
ElementRuleCollector collector(context, m_selectorFilter, style);
return collector.hasAnyMatchingRules(ruleSet);
}
PassRefPtr<RenderStyle> StyleResolver::styleForDocument(const Document* document, CSSFontSelector* fontSelector)
{
const Frame* frame = document->frame();
// HTML5 states that seamless iframes should replace default CSS values
// with values inherited from the containing iframe element. However,
// some values (such as the case of designMode = "on") still need to
// be set by this "document style".
RefPtr<RenderStyle> documentStyle = RenderStyle::create();
bool seamlessWithParent = document->shouldDisplaySeamlesslyWithParent();
if (seamlessWithParent) {
RenderStyle* iframeStyle = document->seamlessParentIFrame()->renderStyle();
if (iframeStyle)
documentStyle->inheritFrom(iframeStyle);
}
// FIXME: It's not clear which values below we want to override in the seamless case!
documentStyle->setDisplay(BLOCK);
if (!seamlessWithParent) {
documentStyle->setRTLOrdering(document->visuallyOrdered() ? VisualOrder : LogicalOrder);
documentStyle->setZoom(frame && !document->printing() ? frame->pageZoomFactor() : 1);
documentStyle->setLocale(document->contentLanguage());
}
// This overrides any -webkit-user-modify inherited from the parent iframe.
documentStyle->setUserModify(document->inDesignMode() ? READ_WRITE : READ_ONLY);
Element* docElement = document->documentElement();
RenderObject* docElementRenderer = docElement ? docElement->renderer() : 0;
if (docElementRenderer) {
// Use the direction and writing-mode of the body to set the
// viewport's direction and writing-mode unless the property is set on the document element.
// If there is no body, then use the document element.
RenderObject* bodyRenderer = document->body() ? document->body()->renderer() : 0;
if (bodyRenderer && !document->writingModeSetOnDocumentElement())
documentStyle->setWritingMode(bodyRenderer->style()->writingMode());
else
documentStyle->setWritingMode(docElementRenderer->style()->writingMode());
if (bodyRenderer && !document->directionSetOnDocumentElement())
documentStyle->setDirection(bodyRenderer->style()->direction());
else
documentStyle->setDirection(docElementRenderer->style()->direction());
}
if (frame) {
if (FrameView* frameView = frame->view()) {
const Pagination& pagination = frameView->pagination();
if (pagination.mode != Pagination::Unpaginated) {
Pagination::setStylesForPaginationMode(pagination.mode, documentStyle.get());
documentStyle->setColumnGap(pagination.gap);
if (RenderView* view = document->renderView()) {
if (view->hasColumns())
view->updateColumnInfoFromStyle(documentStyle.get());
}
}
}
}
// Seamless iframes want to inherit their font from their parent iframe, so early return before setting the font.
if (seamlessWithParent)
return documentStyle.release();
FontBuilder fontBuilder;
fontBuilder.initForStyleResolve(document, documentStyle.get(), document->isSVGDocument());
fontBuilder.createFontForDocument(fontSelector, documentStyle.get());
return documentStyle.release();
}
// FIXME: This is duplicated with StyleAdjuster.cpp
// Perhaps this should move onto ElementResolveContext or even Element?
static inline bool isAtShadowBoundary(const Element* element)
{
if (!element)
return false;
ContainerNode* parentNode = element->parentNode();
return parentNode && parentNode->isShadowRoot();
}
static inline void resetDirectionAndWritingModeOnDocument(Document* document)
{
document->setDirectionSetOnDocumentElement(false);
document->setWritingModeSetOnDocumentElement(false);
}
static void addContentAttrValuesToFeatures(const Vector<AtomicString>& contentAttrValues, RuleFeatureSet& features)
{
for (size_t i = 0; i < contentAttrValues.size(); ++i)
features.attrsInRules.add(contentAttrValues[i].impl());
}
PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderStyle* defaultParent, StyleSharingBehavior sharingBehavior,
RuleMatchingBehavior matchingBehavior, RenderRegion* regionForStyling)
{
ASSERT(document()->frame());
ASSERT(documentSettings());
// Once an element has a renderer, we don't try to destroy it, since otherwise the renderer
// will vanish if a style recalc happens during loading.
if (sharingBehavior == AllowStyleSharing && !element->document()->haveStylesheetsLoaded() && !element->renderer()) {
if (!s_styleNotYetAvailable) {
s_styleNotYetAvailable = RenderStyle::create().leakRef();
s_styleNotYetAvailable->setDisplay(NONE);
s_styleNotYetAvailable->font().update(m_fontSelector);
}
element->document()->setHasNodesWithPlaceholderStyle();
return s_styleNotYetAvailable;
}
if (element == document()->documentElement())
resetDirectionAndWritingModeOnDocument(document());
StyleResolverState state(document(), element, defaultParent, regionForStyling);
if (sharingBehavior == AllowStyleSharing && !state.distributedToInsertionPoint() && state.parentStyle()) {
SharedStyleFinder styleFinder(m_features, m_siblingRuleSet.get(), m_uncommonAttributeRuleSet.get(), this);
RefPtr<RenderStyle> sharedStyle = styleFinder.locateSharedStyle(state.elementContext(), state.style());
if (sharedStyle)
return sharedStyle.release();
}
if (state.parentStyle()) {
state.setStyle(RenderStyle::create());
state.style()->inheritFrom(state.parentStyle(), isAtShadowBoundary(element) ? RenderStyle::AtShadowBoundary : RenderStyle::NotAtShadowBoundary);
} else {
state.setStyle(defaultStyleForElement());
state.setParentStyle(RenderStyle::clone(state.style()));
}
// contenteditable attribute (implemented by -webkit-user-modify) should
// be propagated from shadow host to distributed node.
if (state.distributedToInsertionPoint()) {
if (Element* parent = element->parentElement()) {
if (RenderStyle* styleOfShadowHost = parent->renderStyle())
state.style()->setUserModify(styleOfShadowHost->userModify());
}
}
state.fontBuilder().initForStyleResolve(state.document(), state.style(), state.useSVGZoomRules());
if (element->isLink()) {
state.style()->setIsLink(true);
EInsideLink linkState = state.elementLinkState();
if (linkState != NotInsideLink) {
bool forceVisited = InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoVisited);
if (forceVisited)
linkState = InsideVisitedLink;
}
state.style()->setInsideLink(linkState);
}
bool needsCollection = false;
CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(element, needsCollection);
if (needsCollection) {
collectFeatures();
m_inspectorCSSOMWrappers.reset();
}
{
ElementRuleCollector collector(state.elementContext(), m_selectorFilter, state.style());
collector.setRegionForStyling(regionForStyling);
if (matchingBehavior == MatchOnlyUserAgentRules)
matchUARules(collector);
else
matchAllRules(state, collector, m_matchAuthorAndUserStyles, matchingBehavior != MatchAllRulesExcludingSMIL);
applyMatchedProperties(state, collector.matchedResult());
addContentAttrValuesToFeatures(state.contentAttrValues(), m_features);
}
{
StyleAdjuster adjuster(state.cachedUAStyle(), m_document->inQuirksMode());
adjuster.adjustRenderStyle(state.style(), state.parentStyle(), element);
}
document()->didAccessStyleResolver();
// FIXME: Shouldn't this be on RenderBody::styleDidChange?
if (element->hasTagName(bodyTag))
document()->textLinkColors().setTextColor(state.style()->visitedDependentColor(CSSPropertyColor));
// Now return the style.
return state.takeStyle();
}
PassRefPtr<RenderStyle> StyleResolver::styleForKeyframe(Element* e, const RenderStyle* elementStyle, const StyleKeyframe* keyframe)
{
ASSERT(document()->frame());
ASSERT(documentSettings());
if (e == document()->documentElement())
resetDirectionAndWritingModeOnDocument(document());
StyleResolverState state(document(), e);
MatchResult result;
if (keyframe->properties())
result.addMatchedProperties(keyframe->properties());
ASSERT(!state.style());
// Create the style
state.setStyle(RenderStyle::clone(elementStyle));
state.setLineHeightValue(0);
state.fontBuilder().initForStyleResolve(state.document(), state.style(), state.useSVGZoomRules());
// We don't need to bother with !important. Since there is only ever one
// decl, there's nothing to override. So just add the first properties.
bool inheritedOnly = false;
if (keyframe->properties()) {
// FIXME: Can't keyframes contain variables?
applyMatchedProperties<AnimationProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
applyMatchedProperties<HighPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
}
// If our font got dirtied, go ahead and update it now.
updateFont(state);
// Line-height is set when we are sure we decided on the font-size
if (state.lineHeightValue())
StyleBuilder::applyProperty(CSSPropertyLineHeight, state, state.lineHeightValue());
// Now do rest of the properties.
if (keyframe->properties())
applyMatchedProperties<LowPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
// If our font got dirtied by one of the non-essential font props,
// go ahead and update it a second time.
updateFont(state);
// Start loading resources referenced by this style.
m_styleResourceLoader.loadPendingResources(state.style(), state.elementStyleResources());
document()->didAccessStyleResolver();
return state.takeStyle();
}
const StyleRuleKeyframes* StyleResolver::matchScopedKeyframesRule(const Element* e, const StringImpl* animationName)
{
if (m_styleTree.hasOnlyScopedResolverForDocument())
return m_styleTree.scopedStyleResolverForDocument()->keyframeStylesForAnimation(animationName);
Vector<ScopedStyleResolver*, 8> stack;
m_styleTree.resolveScopedKeyframesRules(e, stack);
if (stack.isEmpty())
return 0;
for (size_t i = 0; i < stack.size(); ++i) {
if (const StyleRuleKeyframes* keyframesRule = stack.at(i)->keyframeStylesForAnimation(animationName))
return keyframesRule;
}
return 0;
}
void StyleResolver::keyframeStylesForAnimation(Element* e, const RenderStyle* elementStyle, KeyframeList& list)
{
ASSERT(!RuntimeEnabledFeatures::webAnimationsCSSEnabled());
list.clear();
// Get the keyframesRule for this name
if (!e || list.animationName().isEmpty())
return;
const StyleRuleKeyframes* keyframesRule = matchScopedKeyframesRule(e, list.animationName().impl());
if (!keyframesRule)
return;
// Construct and populate the style for each keyframe
const Vector<RefPtr<StyleKeyframe> >& keyframes = keyframesRule->keyframes();
for (unsigned i = 0; i < keyframes.size(); ++i) {
// Apply the declaration to the style. This is a simplified version of the logic in styleForElement
const StyleKeyframe* keyframe = keyframes[i].get();
KeyframeValue keyframeValue(0, 0);
keyframeValue.setStyle(styleForKeyframe(e, elementStyle, keyframe));
keyframeValue.addProperties(keyframe->properties());
// Add this keyframe style to all the indicated key times
Vector<double> keys;
keyframe->getKeys(keys);
for (size_t keyIndex = 0; keyIndex < keys.size(); ++keyIndex) {
keyframeValue.setKey(keys[keyIndex]);
list.insert(keyframeValue);
}
}
// If the 0% keyframe is missing, create it (but only if there is at least one other keyframe)
int initialListSize = list.size();
if (initialListSize > 0 && list[0].key()) {
static StyleKeyframe* zeroPercentKeyframe;
if (!zeroPercentKeyframe) {
zeroPercentKeyframe = StyleKeyframe::create().leakRef();
zeroPercentKeyframe->setKeyText("0%");
}
KeyframeValue keyframeValue(0, 0);
keyframeValue.setStyle(styleForKeyframe(e, elementStyle, zeroPercentKeyframe));
keyframeValue.addProperties(zeroPercentKeyframe->properties());
list.insert(keyframeValue);
}
// If the 100% keyframe is missing, create it (but only if there is at least one other keyframe)
if (initialListSize > 0 && (list[list.size() - 1].key() != 1)) {
static StyleKeyframe* hundredPercentKeyframe;
if (!hundredPercentKeyframe) {
hundredPercentKeyframe = StyleKeyframe::create().leakRef();
hundredPercentKeyframe->setKeyText("100%");
}
KeyframeValue keyframeValue(1, 0);
keyframeValue.setStyle(styleForKeyframe(e, elementStyle, hundredPercentKeyframe));
keyframeValue.addProperties(hundredPercentKeyframe->properties());
list.insert(keyframeValue);
}
}
void StyleResolver::resolveKeyframes(Element* element, const RenderStyle* style, const StringImpl* name, KeyframeAnimationEffect::KeyframeVector& keyframes)
{
ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled());
const StyleRuleKeyframes* keyframesRule = matchScopedKeyframesRule(element, name);
if (!keyframesRule)
return;
// Construct and populate the style for each keyframe
const Vector<RefPtr<StyleKeyframe> >& styleKeyframes = keyframesRule->keyframes();
for (size_t i = 0; i < styleKeyframes.size(); ++i) {
const StyleKeyframe* styleKeyframe = styleKeyframes[i].get();
RefPtr<RenderStyle> keyframeStyle = styleForKeyframe(element, style, styleKeyframe);
Vector<double> offsets;
styleKeyframe->getKeys(offsets);
RefPtr<Keyframe> firstOffsetKeyframe;
for (size_t j = 0; j < offsets.size(); ++j) {
RefPtr<Keyframe> keyframe = Keyframe::create();
keyframe->setOffset(offsets[j]);
const StylePropertySet* properties = styleKeyframe->properties();
for (unsigned k = 0; k < properties->propertyCount(); k++) {
CSSPropertyID property = properties->propertyAt(k).id();
keyframe->setPropertyValue(property, firstOffsetKeyframe ? firstOffsetKeyframe->propertyValue(property) : CSSAnimatableValueFactory::create(property, keyframeStyle.get()).get());
}
if (!firstOffsetKeyframe)
firstOffsetKeyframe = keyframe;
keyframes.append(keyframe);
}
}
if (keyframes.isEmpty())
return;
// Remove duplicate keyframes. In CSS the last keyframe at a given offset takes priority.
std::stable_sort(keyframes.begin(), keyframes.end(), Keyframe::compareOffsets);
size_t targetIndex = 0;
for (size_t i = 1; i < keyframes.size(); i++) {
if (keyframes[i]->offset() != keyframes[targetIndex]->offset())
targetIndex++;
if (targetIndex != i)
keyframes[targetIndex] = keyframes[i];
}
keyframes.shrink(targetIndex + 1);
HashSet<CSSPropertyID> allProperties;
for (size_t i = 0; i < keyframes.size(); i++) {
const HashSet<CSSPropertyID> keyframeProperties = keyframes[i]->properties();
for (HashSet<CSSPropertyID>::const_iterator iter = keyframeProperties.begin(); iter != keyframeProperties.end(); ++iter)
allProperties.add(*iter);
}
// Snapshot current property values for 0% and 100% if missing.
RefPtr<Keyframe> startKeyframe = keyframes[0];
if (startKeyframe->offset()) {
startKeyframe = Keyframe::create();
startKeyframe->setOffset(0);
keyframes.prepend(startKeyframe);
}
RefPtr<Keyframe> endKeyframe = keyframes[keyframes.size() - 1];
if (endKeyframe->offset() != 1) {
endKeyframe = Keyframe::create();
endKeyframe->setOffset(1);
keyframes.append(endKeyframe);
}
const HashSet<CSSPropertyID>& startKeyframeProperties = startKeyframe->properties();
const HashSet<CSSPropertyID>& endKeyframeProperties = endKeyframe->properties();
bool missingStartValues = startKeyframeProperties.size() < allProperties.size();
bool missingEndValues = endKeyframeProperties.size() < allProperties.size();
if (!missingStartValues && !missingEndValues)
return;
for (HashSet<CSSPropertyID>::const_iterator iter = allProperties.begin(); iter != allProperties.end(); ++iter) {
const CSSPropertyID property = *iter;
bool startNeedsValue = missingStartValues && !startKeyframeProperties.contains(property);
bool endNeedsValue = missingEndValues && !endKeyframeProperties.contains(property);
if (!startNeedsValue && !endNeedsValue)
continue;
RefPtr<AnimatableValue> snapshotValue = CSSAnimatableValueFactory::create(property, style);
if (startNeedsValue)
startKeyframe->setPropertyValue(property, snapshotValue.get());
if (endNeedsValue)
endKeyframe->setPropertyValue(property, snapshotValue.get());
}
}
const StylePropertySet* StyleResolver::firstKeyframeStyles(const Element* element, const StringImpl* animationName)
{
ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled());
const StyleRuleKeyframes* keyframesRule = matchScopedKeyframesRule(element, animationName);
if (!keyframesRule)
return 0;
// Find the last keyframe at offset 0
const StyleKeyframe* firstKeyframe = 0;
const Vector<RefPtr<StyleKeyframe> >& styleKeyframes = keyframesRule->keyframes();
for (unsigned i = 0; i < styleKeyframes.size(); ++i) {
const StyleKeyframe* styleKeyframe = styleKeyframes[i].get();
Vector<double> offsets;
styleKeyframe->getKeys(offsets);
for (size_t j = 0; j < offsets.size(); ++j) {
if (!offsets[j]) {
firstKeyframe = styleKeyframe;
break;
}
}
}
return firstKeyframe ? firstKeyframe->properties() : 0;
}
PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* e, const PseudoStyleRequest& pseudoStyleRequest, RenderStyle* parentStyle)
{
ASSERT(document()->frame());
ASSERT(documentSettings());
ASSERT(parentStyle);
if (!e)
return 0;
if (e == document()->documentElement())
resetDirectionAndWritingModeOnDocument(document());
StyleResolverState state(document(), e, parentStyle);
if (pseudoStyleRequest.allowsInheritance(state.parentStyle())) {
state.setStyle(RenderStyle::create());
state.style()->inheritFrom(state.parentStyle());
} else {
state.setStyle(defaultStyleForElement());
state.setParentStyle(RenderStyle::clone(state.style()));
}
state.fontBuilder().initForStyleResolve(state.document(), state.style(), state.useSVGZoomRules());
// Since we don't use pseudo-elements in any of our quirk/print
// user agent rules, don't waste time walking those rules.
{
// Check UA, user and author rules.
ElementRuleCollector collector(state.elementContext(), m_selectorFilter, state.style());
collector.setPseudoStyleRequest(pseudoStyleRequest);
matchUARules(collector);
if (m_matchAuthorAndUserStyles) {
matchUserRules(collector, false);
matchAuthorRules(state.element(), collector, false);
}
if (collector.matchedResult().matchedProperties.isEmpty())
return 0;
state.style()->setStyleType(pseudoStyleRequest.pseudoId);
applyMatchedProperties(state, collector.matchedResult());
addContentAttrValuesToFeatures(state.contentAttrValues(), m_features);
}
{
StyleAdjuster adjuster(state.cachedUAStyle(), m_document->inQuirksMode());
// FIXME: Passing 0 as the Element* introduces a lot of complexity
// in the adjustRenderStyle code.
adjuster.adjustRenderStyle(state.style(), state.parentStyle(), 0);
}
// Start loading resources referenced by this style.
m_styleResourceLoader.loadPendingResources(state.style(), state.elementStyleResources());
document()->didAccessStyleResolver();
// Now return the style.
return state.takeStyle();
}
PassRefPtr<RenderStyle> StyleResolver::styleForPage(int pageIndex)
{
resetDirectionAndWritingModeOnDocument(document());
StyleResolverState state(document(), document()->documentElement()); // m_rootElementStyle will be set to the document style.
state.setStyle(RenderStyle::create());
state.style()->inheritFrom(state.rootElementStyle());
state.fontBuilder().initForStyleResolve(state.document(), state.style(), state.useSVGZoomRules());
PageRuleCollector collector(state.elementContext(), pageIndex);
collector.matchPageRules(CSSDefaultStyleSheets::defaultPrintStyle);
collector.matchPageRules(m_ruleSets.userStyle());
if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
scopedResolver->matchPageRules(collector);
state.setLineHeightValue(0);
bool inheritedOnly = false;
MatchResult& result = collector.matchedResult();
applyMatchedProperties<VariableDefinitions>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
applyMatchedProperties<HighPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
// If our font got dirtied, go ahead and update it now.
updateFont(state);
// Line-height is set when we are sure we decided on the font-size.
if (state.lineHeightValue())
StyleBuilder::applyProperty(CSSPropertyLineHeight, state, state.lineHeightValue());
applyMatchedProperties<LowPriorityProperties>(state, result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
addContentAttrValuesToFeatures(state.contentAttrValues(), m_features);
// Start loading resources referenced by this style.
m_styleResourceLoader.loadPendingResources(state.style(), state.elementStyleResources());
document()->didAccessStyleResolver();
// Now return the style.
return state.takeStyle();
}
void StyleResolver::collectViewportRules()
{
ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
collectViewportRules(CSSDefaultStyleSheets::defaultStyle);
if (m_ruleSets.userStyle())
collectViewportRules(m_ruleSets.userStyle());
if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
scopedResolver->collectViewportRulesTo(this);
viewportStyleResolver()->resolve();
}
void StyleResolver::collectViewportRules(RuleSet* rules)
{
ASSERT(RuntimeEnabledFeatures::cssViewportEnabled());
rules->compactRulesIfNeeded();
const Vector<StyleRuleViewport*>& viewportRules = rules->viewportRules();
for (size_t i = 0; i < viewportRules.size(); ++i)
viewportStyleResolver()->addViewportRule(viewportRules[i]);
}
PassRefPtr<RenderStyle> StyleResolver::defaultStyleForElement()
{
StyleResolverState state(document(), 0);
state.setStyle(RenderStyle::create());
state.fontBuilder().initForStyleResolve(document(), state.style(), state.useSVGZoomRules());
state.style()->setLineHeight(RenderStyle::initialLineHeight());
state.setLineHeightValue(0);
state.fontBuilder().setInitial(state.style()->effectiveZoom());
state.style()->font().update(fontSelector());
return state.takeStyle();
}
PassRefPtr<RenderStyle> StyleResolver::styleForText(Text* textNode)
{
ASSERT(textNode);
NodeRenderingTraversal::ParentDetails parentDetails;
Node* parentNode = NodeRenderingTraversal::parent(textNode, &parentDetails);
if (!parentNode || !parentNode->renderStyle() || parentDetails.resetStyleInheritance())
return defaultStyleForElement();
return parentNode->renderStyle();
}
bool StyleResolver::checkRegionStyle(Element* regionElement)
{
// FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment,
// so all region rules are global by default. Verify whether that can stand or needs changing.
if (ScopedStyleResolver* scopedResolver = m_styleTree.scopedStyleResolverForDocument())
if (scopedResolver->checkRegionStyle(regionElement))
return true;
if (m_ruleSets.userStyle()) {
unsigned rulesSize = m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.size();
for (unsigned i = 0; i < rulesSize; ++i) {
ASSERT(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).ruleSet.get());
if (checkRegionSelector(m_ruleSets.userStyle()->m_regionSelectorsAndRuleSets.at(i).selector, regionElement))
return true;
}
}
return false;
}
void StyleResolver::updateFont(StyleResolverState& state)
{
state.fontBuilder().createFont(m_fontSelector, state.parentStyle(), state.style());
}
PassRefPtr<CSSRuleList> StyleResolver::styleRulesForElement(Element* e, unsigned rulesToInclude)
{
return pseudoStyleRulesForElement(e, NOPSEUDO, rulesToInclude);
}
PassRefPtr<CSSRuleList> StyleResolver::pseudoStyleRulesForElement(Element* e, PseudoId pseudoId, unsigned rulesToInclude)
{
if (!e || !e->document()->haveStylesheetsLoaded())
return 0;
if (e == document()->documentElement())
resetDirectionAndWritingModeOnDocument(document());
StyleResolverState state(document(), e);
ElementRuleCollector collector(state.elementContext(), m_selectorFilter, state.style());
collector.setMode(SelectorChecker::CollectingRules);
collector.setPseudoStyleRequest(PseudoStyleRequest(pseudoId));
if (rulesToInclude & UAAndUserCSSRules) {
// First we match rules from the user agent sheet.
matchUARules(collector);
// Now we check user sheet rules.
if (m_matchAuthorAndUserStyles)
matchUserRules(collector, rulesToInclude & EmptyCSSRules);
}
if (m_matchAuthorAndUserStyles && (rulesToInclude & AuthorCSSRules)) {
collector.setSameOriginOnly(!(rulesToInclude & CrossOriginCSSRules));
// Check the rules in author sheets.
matchAuthorRules(state.element(), collector, rulesToInclude & EmptyCSSRules);
}
return collector.matchedRuleList();
}
// -------------------------------------------------------------------------------------
// this is mostly boring stuff on how to apply a certain rule to the renderstyle...
template <StyleResolver::StyleApplicationPass pass>
void StyleResolver::applyAnimatedProperties(StyleResolverState& state, const Element* target, const DocumentTimeline* timeline, const CSSAnimationUpdate* update)
{
ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled());
ASSERT(pass != VariableDefinitions);
ASSERT(pass != AnimationProperties);
if (update && update->styles()) {
bool applyInheritedOnly = false;
bool isImportant = false;
StyleRule* rule = 0;
applyProperties<pass>(state, update->styles(), rule, isImportant, applyInheritedOnly, PropertyWhitelistNone);
isImportant = true;
applyProperties<pass>(state, update->styles(), rule, isImportant, applyInheritedOnly, PropertyWhitelistNone);
}
AnimationStack* animationStack = timeline->animationStack(target);
if (!animationStack)
return;
const Vector<Animation*>& animations = animationStack->activeAnimations(target);
for (size_t i = 0; i < animations.size(); ++i) {
RefPtr<Animation> animation = animations.at(i);
if (update && update->isFiltered(animation->player()))
continue;
const AnimationEffect::CompositableValueMap* compositableValues = animation->compositableValues();
for (AnimationEffect::CompositableValueMap::const_iterator iter = compositableValues->begin(); iter != compositableValues->end(); ++iter) {
CSSPropertyID property = iter->key;
if (!isPropertyForPass<pass>(property))
continue;
RELEASE_ASSERT_WITH_MESSAGE(!iter->value->dependsOnUnderlyingValue(), "Not yet implemented: An interface for compositing onto the underlying value.");
RefPtr<AnimatableValue> animatableValue = iter->value->compositeOnto(0);
if (pass == HighPriorityProperties && property == CSSPropertyLineHeight)
state.setLineHeightValue(toAnimatableNumber(animatableValue.get())->toCSSValue().get());
else
AnimatedStyleBuilder::applyProperty(property, state, animatableValue.get());
}
}
}
// http://dev.w3.org/csswg/css3-regions/#the-at-region-style-rule
// FIXME: add incremental support for other region styling properties.
static inline bool isValidRegionStyleProperty(CSSPropertyID id)
{
switch (id) {
case CSSPropertyBackgroundColor:
case CSSPropertyColor:
return true;
default:
break;
}
return false;
}
static inline bool isValidCueStyleProperty(CSSPropertyID id)
{
switch (id) {
case CSSPropertyBackground:
case CSSPropertyBackgroundAttachment:
case CSSPropertyBackgroundClip:
case CSSPropertyBackgroundColor:
case CSSPropertyBackgroundImage:
case CSSPropertyBackgroundOrigin:
case CSSPropertyBackgroundPosition:
case CSSPropertyBackgroundPositionX:
case CSSPropertyBackgroundPositionY:
case CSSPropertyBackgroundRepeat:
case CSSPropertyBackgroundRepeatX:
case CSSPropertyBackgroundRepeatY:
case CSSPropertyBackgroundSize:
case CSSPropertyColor:
case CSSPropertyFont:
case CSSPropertyFontFamily:
case CSSPropertyFontSize:
case CSSPropertyFontStyle:
case CSSPropertyFontVariant:
case CSSPropertyFontWeight:
case CSSPropertyLineHeight:
case CSSPropertyOpacity:
case CSSPropertyOutline:
case CSSPropertyOutlineColor:
case CSSPropertyOutlineOffset:
case CSSPropertyOutlineStyle:
case CSSPropertyOutlineWidth:
case CSSPropertyVisibility:
case CSSPropertyWhiteSpace:
// FIXME: 'text-decoration' shorthand to be handled when available.
// See https://chromiumcodereview.appspot.com/19516002 for details.
case CSSPropertyTextDecoration:
case CSSPropertyTextShadow:
case CSSPropertyBorderStyle:
return true;
case CSSPropertyTextDecorationLine:
case CSSPropertyTextDecorationStyle:
case CSSPropertyTextDecorationColor:
return RuntimeEnabledFeatures::css3TextDecorationsEnabled();
default:
break;
}
return false;
}
template <StyleResolver::StyleApplicationPass pass>
bool StyleResolver::isPropertyForPass(CSSPropertyID property)
{
COMPILE_ASSERT(CSSPropertyVariable < firstCSSProperty, CSS_variable_is_before_first_property);
const CSSPropertyID firstAnimationProperty = CSSPropertyDisplay;
const CSSPropertyID lastAnimationProperty = CSSPropertyTransitionTimingFunction;
COMPILE_ASSERT(firstCSSProperty == firstAnimationProperty, CSS_first_animation_property_should_be_first_property);
const CSSPropertyID firstHighPriorityProperty = CSSPropertyColor;
const CSSPropertyID lastHighPriorityProperty = CSSPropertyLineHeight;
COMPILE_ASSERT(lastAnimationProperty + 1 == firstHighPriorityProperty, CSS_color_is_first_high_priority_property);
COMPILE_ASSERT(CSSPropertyLineHeight == firstHighPriorityProperty + 17, CSS_line_height_is_end_of_high_prioity_property_range);
COMPILE_ASSERT(CSSPropertyZoom == lastHighPriorityProperty - 1, CSS_zoom_is_before_line_height);
switch (pass) {
case VariableDefinitions:
return property == CSSPropertyVariable;
case AnimationProperties:
return property >= firstAnimationProperty && property <= lastAnimationProperty;
case HighPriorityProperties:
return property >= firstHighPriorityProperty && property <= lastHighPriorityProperty;
case LowPriorityProperties:
return property > lastHighPriorityProperty;
}
ASSERT_NOT_REACHED();
return false;
}
template <StyleResolver::StyleApplicationPass pass>
void StyleResolver::applyProperties(StyleResolverState& state, const StylePropertySet* properties, StyleRule* rule, bool isImportant, bool inheritedOnly, PropertyWhitelistType propertyWhitelistType)
{
ASSERT((propertyWhitelistType != PropertyWhitelistRegion) || state.regionForStyling());
unsigned propertyCount = properties->propertyCount();
for (unsigned i = 0; i < propertyCount; ++i) {
StylePropertySet::PropertyReference current = properties->propertyAt(i);
if (isImportant != current.isImportant())
continue;
if (inheritedOnly && !current.isInherited()) {
// If the property value is explicitly inherited, we need to apply further non-inherited properties
// as they might override the value inherited here. For this reason we don't allow declarations with
// explicitly inherited properties to be cached.
ASSERT(!current.value()->isInheritedValue());
continue;
}
CSSPropertyID property = current.id();
if (propertyWhitelistType == PropertyWhitelistRegion && !isValidRegionStyleProperty(property))
continue;
if (propertyWhitelistType == PropertyWhitelistCue && !isValidCueStyleProperty(property))
continue;
if (!isPropertyForPass<pass>(property))
continue;
if (pass == HighPriorityProperties && property == CSSPropertyLineHeight)
state.setLineHeightValue(current.value());
else
StyleBuilder::applyProperty(current.id(), state, current.value());
}
}
template <StyleResolver::StyleApplicationPass pass>
void StyleResolver::applyMatchedProperties(StyleResolverState& state, const MatchResult& matchResult, bool isImportant, int startIndex, int endIndex, bool inheritedOnly)
{
if (startIndex == -1)
return;
if (state.style()->insideLink() != NotInsideLink) {
for (int i = startIndex; i <= endIndex; ++i) {
const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
unsigned linkMatchType = matchedProperties.linkMatchType;
// FIXME: It would be nicer to pass these as arguments but that requires changes in many places.
state.setApplyPropertyToRegularStyle(linkMatchType & SelectorChecker::MatchLink);
state.setApplyPropertyToVisitedLinkStyle(linkMatchType & SelectorChecker::MatchVisited);
applyProperties<pass>(state, matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
}
state.setApplyPropertyToRegularStyle(true);
state.setApplyPropertyToVisitedLinkStyle(false);
return;
}
for (int i = startIndex; i <= endIndex; ++i) {
const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
applyProperties<pass>(state, matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
}
}
static unsigned computeMatchedPropertiesHash(const MatchedProperties* properties, unsigned size)
{
return StringHasher::hashMemory(properties, sizeof(MatchedProperties) * size);
}
void StyleResolver::invalidateMatchedPropertiesCache()
{
m_matchedPropertiesCache.clear();
}
PassOwnPtr<CSSAnimationUpdate> StyleResolver::calculateCSSAnimationUpdate(StyleResolverState& state)
{
if (!RuntimeEnabledFeatures::webAnimationsCSSEnabled())
return nullptr;
const Element* element = state.element();
ASSERT(element);
if (!CSSAnimations::needsUpdate(element, state.style()))
return nullptr;
ActiveAnimations* activeAnimations = element->activeAnimations();
const CSSAnimationDataList* animations = state.style()->animations();
const CSSAnimations* cssAnimations = activeAnimations ? activeAnimations->cssAnimations() : 0;
EDisplay display = state.style()->display();
return CSSAnimations::calculateUpdate(element, display, cssAnimations, animations, this);
}
void StyleResolver::applyMatchedProperties(StyleResolverState& state, const MatchResult& matchResult)
{
const Element* element = state.element();
ASSERT(element);
STYLE_STATS_ADD_MATCHED_PROPERTIES_SEARCH();
unsigned cacheHash = matchResult.isCacheable ? computeMatchedPropertiesHash(matchResult.matchedProperties.data(), matchResult.matchedProperties.size()) : 0;
bool applyInheritedOnly = false;
const CachedMatchedProperties* cachedMatchedProperties = 0;
if (cacheHash && (cachedMatchedProperties = m_matchedPropertiesCache.find(cacheHash, state, matchResult))
&& MatchedPropertiesCache::isCacheable(element, state.style(), state.parentStyle())) {
STYLE_STATS_ADD_MATCHED_PROPERTIES_HIT();
// We can build up the style by copying non-inherited properties from an earlier style object built using the same exact
// style declarations. We then only need to apply the inherited properties, if any, as their values can depend on the
// element context. This is fast and saves memory by reusing the style data structures.
state.style()->copyNonInheritedFrom(cachedMatchedProperties->renderStyle.get());
if (state.parentStyle()->inheritedDataShared(cachedMatchedProperties->parentRenderStyle.get()) && !isAtShadowBoundary(element)) {
STYLE_STATS_ADD_MATCHED_PROPERTIES_HIT_SHARED_INHERITED();
EInsideLink linkStatus = state.style()->insideLink();
// If the cache item parent style has identical inherited properties to the current parent style then the
// resulting style will be identical too. We copy the inherited properties over from the cache and are done.
state.style()->inheritFrom(cachedMatchedProperties->renderStyle.get());
// Unfortunately the link status is treated like an inherited property. We need to explicitly restore it.
state.style()->setInsideLink(linkStatus);
return;
}
applyInheritedOnly = true;
}
// First apply all variable definitions, as they may be used during application of later properties.
applyMatchedProperties<VariableDefinitions>(state, matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
applyMatchedProperties<VariableDefinitions>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
// Apply animation properties in order to apply animation results and trigger transitions below.
applyMatchedProperties<AnimationProperties>(state, matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
applyMatchedProperties<AnimationProperties>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
applyMatchedProperties<AnimationProperties>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
applyMatchedProperties<AnimationProperties>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
OwnPtr<CSSAnimationUpdate> cssAnimationUpdate = calculateCSSAnimationUpdate(state);
// Now we have all of the matched rules in the appropriate order. Walk the rules and apply
// high-priority properties first, i.e., those properties that other properties depend on.
// The order is (1) high-priority not important, (2) high-priority important, (3) normal not important
// and (4) normal important.
state.setLineHeightValue(0);
applyMatchedProperties<HighPriorityProperties>(state, matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
// Animation contributions are processed here because CSS Animations are overridable by user !important rules.
if (RuntimeEnabledFeatures::webAnimationsEnabled() && !applyInheritedOnly)
applyAnimatedProperties<HighPriorityProperties>(state, element, element->document()->timeline(), cssAnimationUpdate.get());
applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
applyMatchedProperties<HighPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
if (cachedMatchedProperties && cachedMatchedProperties->renderStyle->effectiveZoom() != state.style()->effectiveZoom()) {
state.fontBuilder().setFontDirty(true);
applyInheritedOnly = false;
}
// If our font got dirtied, go ahead and update it now.
updateFont(state);
// Line-height is set when we are sure we decided on the font-size.
if (state.lineHeightValue())
StyleBuilder::applyProperty(CSSPropertyLineHeight, state, state.lineHeightValue());
// Many properties depend on the font. If it changes we just apply all properties.
if (cachedMatchedProperties && cachedMatchedProperties->renderStyle->fontDescription() != state.style()->fontDescription())
applyInheritedOnly = false;
// Now do the normal priority UA properties.
applyMatchedProperties<LowPriorityProperties>(state, matchResult, false, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
// Cache the UA properties to pass them to RenderTheme in adjustRenderStyle.
state.cacheUserAgentBorderAndBackground();
// Now do the author and user normal priority properties and all the !important properties.
applyMatchedProperties<LowPriorityProperties>(state, matchResult, false, matchResult.ranges.lastUARule + 1, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
if (RuntimeEnabledFeatures::webAnimationsEnabled() && !applyInheritedOnly)
applyAnimatedProperties<LowPriorityProperties>(state, element, element->document()->timeline(), cssAnimationUpdate.get());
applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
applyMatchedProperties<LowPriorityProperties>(state, matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
// Start loading resources referenced by this style.
m_styleResourceLoader.loadPendingResources(state.style(), state.elementStyleResources());
ASSERT(!state.fontBuilder().fontDirty());
#ifdef STYLE_STATS
if (!cachedMatchedProperties)
STYLE_STATS_ADD_MATCHED_PROPERTIES_TO_CACHE();
#endif
if (cachedMatchedProperties || !cacheHash)
return;
if (!MatchedPropertiesCache::isCacheable(element, state.style(), state.parentStyle()))
return;
STYLE_STATS_ADD_MATCHED_PROPERTIES_ENTERED_INTO_CACHE();
m_matchedPropertiesCache.add(state.style(), state.parentStyle(), cacheHash, matchResult);
}
CSSPropertyValue::CSSPropertyValue(CSSPropertyID id, const StylePropertySet& propertySet)
: property(id), value(propertySet.getPropertyCSSValue(id).get())
{ }
void StyleResolver::applyPropertiesToStyle(const CSSPropertyValue* properties, size_t count, RenderStyle* style)
{
StyleResolverState state(document(), 0, style);
state.setStyle(style);
state.fontBuilder().initForStyleResolve(document(), style, state.useSVGZoomRules());
for (size_t i = 0; i < count; ++i) {
if (properties[i].value) {
// As described in BUG66291, setting font-size and line-height on a font may entail a CSSPrimitiveValue::computeLengthDouble call,
// which assumes the fontMetrics are available for the affected font, otherwise a crash occurs (see http://trac.webkit.org/changeset/96122).
// The updateFont() call below updates the fontMetrics and ensure the proper setting of font-size and line-height.
switch (properties[i].property) {
case CSSPropertyFontSize:
case CSSPropertyLineHeight:
updateFont(state);
break;
default:
break;
}
StyleBuilder::applyProperty(properties[i].property, state, properties[i].value);
}
}
}
void StyleResolver::addViewportDependentMediaQueryResult(const MediaQueryExp* expr, bool result)
{
m_viewportDependentMediaQueryResults.append(adoptPtr(new MediaQueryResult(*expr, result)));
}
bool StyleResolver::affectedByViewportChange() const
{
unsigned s = m_viewportDependentMediaQueryResults.size();
for (unsigned i = 0; i < s; i++) {
if (m_medium->eval(&m_viewportDependentMediaQueryResults[i]->m_expression) != m_viewportDependentMediaQueryResults[i]->m_result)
return true;
}
return false;
}
#ifdef STYLE_STATS
StyleSharingStats StyleResolver::m_styleSharingStats;
static void printStyleStats(unsigned searches, unsigned elementsEligibleForSharing, unsigned stylesShared, unsigned searchFoundSiblingForSharing, unsigned searchesMissedSharing,
unsigned matchedPropertiesSearches, unsigned matchedPropertiesHit, unsigned matchedPropertiesSharedInheritedHit, unsigned matchedPropertiesToCache, unsigned matchedPropertiesEnteredIntoCache)
{
double percentOfElementsSharingStyle = (stylesShared * 100.0) / searches;
double percentOfNodesEligibleForSharing = (elementsEligibleForSharing * 100.0) / searches;
double percentOfEligibleSharingRelativesFound = (searchFoundSiblingForSharing * 100.0) / searches;
double percentOfMatchedPropertiesHit = (matchedPropertiesHit * 100.0) / matchedPropertiesSearches;
double percentOfMatchedPropertiesSharedInheritedHit = (matchedPropertiesSharedInheritedHit * 100.0) / matchedPropertiesSearches;
double percentOfMatchedPropertiesEnteredIntoCache = (matchedPropertiesEnteredIntoCache * 100.0) / matchedPropertiesToCache;
fprintf(stderr, "%u elements checked, %u were eligible for style sharing (%.2f%%).\n", searches, elementsEligibleForSharing, percentOfNodesEligibleForSharing);
fprintf(stderr, "%u elements were found to share with, %u were possible (%.2f%%).\n", searchFoundSiblingForSharing, searchesMissedSharing + searchFoundSiblingForSharing, percentOfEligibleSharingRelativesFound);
fprintf(stderr, "%u styles were actually shared once sibling and attribute rules were considered (%.2f%%).\n", stylesShared, percentOfElementsSharingStyle);
fprintf(stderr, "%u/%u (%.2f%%) matched property lookups hit the cache.\n", matchedPropertiesHit, matchedPropertiesSearches, percentOfMatchedPropertiesHit);
fprintf(stderr, "%u/%u (%.2f%%) matched property lookups hit the cache and shared inherited data.\n", matchedPropertiesSharedInheritedHit, matchedPropertiesSearches, percentOfMatchedPropertiesSharedInheritedHit);
fprintf(stderr, "%u/%u (%.2f%%) matched properties were cacheable\n", matchedPropertiesEnteredIntoCache, matchedPropertiesToCache, percentOfMatchedPropertiesEnteredIntoCache);
}
void StyleSharingStats::printStats() const
{
fprintf(stderr, "--------------------------------------------------------------------------------\n");
fprintf(stderr, "This recalc style:\n");
printStyleStats(m_searches, m_elementsEligibleForSharing, m_stylesShared, m_searchFoundSiblingForSharing, m_searchesMissedSharing,
m_matchedPropertiesSearches, m_matchedPropertiesHit, m_matchedPropertiesSharedInheritedHit, m_matchedPropertiesToCache, m_matchedPropertiesEnteredIntoCache);
fprintf(stderr, "Total:\n");
printStyleStats(m_totalSearches, m_totalElementsEligibleForSharing, m_totalStylesShared, m_totalSearchFoundSiblingForSharing, m_totalSearchesMissedSharing,
m_totalMatchedPropertiesSearches, m_totalMatchedPropertiesHit, m_totalMatchedPropertiesSharedInheritedHit, m_totalMatchedPropertiesToCache, m_totalMatchedPropertiesEnteredIntoCache);
fprintf(stderr, "--------------------------------------------------------------------------------\n");
}
#endif
} // namespace WebCore