Source/WebCore/css/StyleResolver.cpp

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
   4  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
   5  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
   6  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
   7  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
   8  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
   9  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  10  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  11  * Copyright (C) 2012 Google Inc. All rights reserved.
  12  *
  13  * This library is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Library General Public
  15  * License as published by the Free Software Foundation; either
  16  * version 2 of the License, or (at your option) any later version.
  17  *
  18  * This library is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Library General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Library General Public License
  24  * along with this library; see the file COPYING.LIB.  If not, write to
  25  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26  * Boston, MA 02110-1301, USA.
  27  */
  28
  29 #include "config.h"
  30 #include "StyleResolver.h"
  31
  32 #include "Attribute.h"
  33 #include "CSSBorderImage.h"
  34 #include "CSSCalculationValue.h"
  35 #include "CSSCursorImageValue.h"
  36 #include "CSSDefaultStyleSheets.h"
  37 #include "CSSFilterImageValue.h"
  38 #include "CSSFontFaceRule.h"
  39 #include "CSSFontFeatureValue.h"
  40 #include "CSSFontSelector.h"
  41 #include "CSSFontValue.h"
  42 #include "CSSGridTemplateValue.h"
  43 #include "CSSLineBoxContainValue.h"
  44 #include "CSSPageRule.h"
  45 #include "CSSParser.h"
  46 #include "CSSPrimitiveValueMappings.h"
  47 #include "CSSPropertyNames.h"
  48 #include "CSSReflectValue.h"
  49 #include "CSSSelector.h"
  50 #include "CSSSelectorList.h"
  51 #include "CSSShadowValue.h"
  52 #include "CSSStyleRule.h"
  53 #include "CSSSupportsRule.h"
  54 #include "CSSTimingFunctionValue.h"
  55 #include "CSSValueList.h"
  56 #include "CachedImage.h"
  57 #include "CalculationValue.h"
  58 #include "ContentData.h"
  59 #include "Counter.h"
  60 #include "CounterContent.h"
  61 #include "CursorList.h"
  62 #include "DeprecatedStyleBuilder.h"
  63 #include "DocumentStyleSheetCollection.h"
  64 #include "ElementRuleCollector.h"
  65 #include "Frame.h"
  66 #include "FrameSelection.h"
  67 #include "FrameView.h"
  68 #include "HTMLDocument.h"
  69 #include "HTMLIFrameElement.h"
  70 #include "HTMLInputElement.h"
  71 #include "HTMLNames.h"
  72 #include "HTMLOptGroupElement.h"
  73 #include "HTMLOptionElement.h"
  74 #include "HTMLProgressElement.h"
  75 #include "HTMLStyleElement.h"
  76 #include "HTMLTableElement.h"
  77 #include "HTMLTextAreaElement.h"
  78 #include "InsertionPoint.h"
  79 #include "InspectorInstrumentation.h"
  80 #include "KeyframeList.h"
  81 #include "LinkHash.h"
  82 #include "LocaleToScriptMapping.h"
  83 #include "MathMLNames.h"
  84 #include "MediaList.h"
  85 #include "MediaQueryEvaluator.h"
  86 #include "NodeRenderStyle.h"
  87 #include "NodeRenderingTraversal.h"
  88 #include "Page.h"
  89 #include "PageRuleCollector.h"
  90 #include "Pair.h"
  91 #include "QuotesData.h"
  92 #include "Rect.h"
  93 #include "RenderRegion.h"
  94 #include "RenderScrollbar.h"
  95 #include "RenderScrollbarTheme.h"
  96 #include "RenderStyleConstants.h"
  97 #include "RenderTheme.h"
  98 #include "RenderView.h"
  99 #include "RuleSet.h"
 100 #include "SVGDocumentExtensions.h"
 101 #include "SVGFontFaceElement.h"
 102 #include "SecurityOrigin.h"
 103 #include "SelectorCheckerFastPath.h"
 104 #include "Settings.h"
 105 #include "ShadowData.h"
 106 #include "ShadowRoot.h"
 107 #include "StyleCachedImage.h"
 108 #include "StyleFontSizeFunctions.h"
 109 #include "StyleGeneratedImage.h"
 110 #include "StylePendingImage.h"
 111 #include "StyleProperties.h"
 112 #include "StylePropertyShorthand.h"
 113 #include "StyleRule.h"
 114 #include "StyleRuleImport.h"
 115 #include "StyleSheetContents.h"
 116 #include "StyleSheetList.h"
 117 #include "Text.h"
 118 #include "TransformFunctions.h"
 119 #include "TransformOperations.h"
 120 #include "UserAgentStyleSheets.h"
 121 #include "ViewportStyleResolver.h"
 122 #include "VisitedLinkState.h"
 123 #include "WebKitCSSKeyframeRule.h"
 124 #include "WebKitCSSKeyframesRule.h"
 125 #include "WebKitCSSRegionRule.h"
 126 #include "WebKitCSSTransformValue.h"
 127 #include "WebKitFontFamilyNames.h"
 128 #include "XMLNames.h"
 129 #include <wtf/StdLibExtras.h>
 130 #include <wtf/Vector.h>
 131
 132 #if ENABLE(CSS_FILTERS)
 133 #include "FilterOperation.h"
 134 #include "WebKitCSSFilterValue.h"
 135 #endif
 136
 137 #if ENABLE(CSS_IMAGE_SET)
 138 #include "CSSImageSetValue.h"
 139 #include "StyleCachedImageSet.h"
 140 #endif
 141
 142 #if ENABLE(CSS_SHADERS)
 143 #include "CustomFilterArrayParameter.h"
 144 #include "CustomFilterColorParameter.h"
 145 #include "CustomFilterConstants.h"
 146 #include "CustomFilterNumberParameter.h"
 147 #include "CustomFilterOperation.h"
 148 #include "CustomFilterParameter.h"
 149 #include "CustomFilterProgramInfo.h"
 150 #include "CustomFilterTransformParameter.h"
 151 #include "StyleCachedShader.h"
 152 #include "StyleCustomFilterProgram.h"
 153 #include "StyleCustomFilterProgramCache.h"
 154 #include "StylePendingShader.h"
 155 #include "StyleShader.h"
 156 #include "WebKitCSSMixFunctionValue.h"
 157 #include "WebKitCSSShaderValue.h"
 158 #endif
 159
 160 #if ENABLE(CSS_SHAPES)
 161 #include "CachedResourceLoader.h"
 162 #endif
 163
 164 #if ENABLE(DASHBOARD_SUPPORT)
 165 #include "DashboardRegion.h"
 166 #endif
 167
 168 #if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
 169 #include "HTMLAudioElement.h"
 170 #endif
 171
 172 #if ENABLE(SVG)
 173 #include "CachedSVGDocument.h"
 174 #include "CachedSVGDocumentReference.h"
 175 #include "SVGDocument.h"
 176 #include "SVGElement.h"
 177 #include "SVGNames.h"
 178 #include "SVGURIReference.h"
 179 #include "WebKitCSSSVGDocumentValue.h"
 180 #endif
 181
 182 #if ENABLE(VIDEO_TRACK)
 183 #include "WebVTTElement.h"
 184 #endif
 185
 186 #if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
 187 #include "HTMLMediaElement.h"
 188 #endif
 189
 190 namespace WebCore {
 191
 192 using namespace HTMLNames;
 193
 194 #define HANDLE_INHERIT(prop, Prop) \
 195 if (isInherit) { \
 196     m_state.style()->set##Prop(m_state.parentStyle()->prop()); \
 197     return; \
 198 }
 199
 200 #define HANDLE_INHERIT_AND_INITIAL(prop, Prop) \
 201 HANDLE_INHERIT(prop, Prop) \
 202 if (isInitial) { \
 203     m_state.style()->set##Prop(RenderStyle::initial##Prop()); \
 204     return; \
 205 }
 206
 207 RenderStyle* StyleResolver::s_styleNotYetAvailable;
 208
 209 inline void StyleResolver::State::cacheBorderAndBackground()
 210 {
 211     m_hasUAAppearance = m_style->hasAppearance();
 212     if (m_hasUAAppearance) {
 213         m_borderData = m_style->border();
 214         m_backgroundData = *m_style->backgroundLayers();
 215         m_backgroundColor = m_style->backgroundColor();
 216     }
 217 }
 218
 219 inline void StyleResolver::State::clear()
 220 {
 221     m_element = 0;
 222     m_styledElement = 0;
 223     m_parentStyle = 0;
 224     m_parentNode = 0;
 225     m_regionForStyling = 0;
 226     m_pendingImageProperties.clear();
 227 #if ENABLE(CSS_SHADERS)
 228     m_hasPendingShaders = false;
 229 #endif
 230 #if ENABLE(CSS_FILTERS) && ENABLE(SVG)
 231     m_pendingSVGDocuments.clear();
 232 #endif
 233 }
 234
 235 void StyleResolver::MatchResult::addMatchedProperties(const StyleProperties& properties, StyleRule* rule, unsigned linkMatchType, PropertyWhitelistType propertyWhitelistType)
 236 {
 237     matchedProperties.grow(matchedProperties.size() + 1);
 238     StyleResolver::MatchedProperties& newProperties = matchedProperties.last();
 239     newProperties.properties = const_cast<StyleProperties*>(&properties);
 240     newProperties.linkMatchType = linkMatchType;
 241     newProperties.whitelistType = propertyWhitelistType;
 242     matchedRules.append(rule);
 243 }
 244
 245 StyleResolver::StyleResolver(Document& document, bool matchAuthorAndUserStyles)
 246     : m_matchedPropertiesCacheAdditionsSinceLastSweep(0)
 247     , m_matchedPropertiesCacheSweepTimer(this, &StyleResolver::sweepMatchedPropertiesCache)
 248     , m_document(document)
 249     , m_matchAuthorAndUserStyles(matchAuthorAndUserStyles)
 250     , m_fontSelector(CSSFontSelector::create(&m_document))
 251 #if ENABLE(CSS_DEVICE_ADAPTATION)
 252     , m_viewportStyleResolver(ViewportStyleResolver::create(&document))
 253 #endif
 254     , m_deprecatedStyleBuilder(DeprecatedStyleBuilder::sharedStyleBuilder())
 255     , m_styleMap(this)
 256 {
 257     Element* root = m_document.documentElement();
 258
 259     CSSDefaultStyleSheets::initDefaultStyle(root);
 260
 261     // construct document root element default style. this is needed
 262     // to evaluate media queries that contain relative constraints, like "screen and (max-width: 10em)"
 263     // This is here instead of constructor, because when constructor is run,
 264     // document doesn't have documentElement
 265     // NOTE: this assumes that element that gets passed to styleForElement -call
 266     // is always from the document that owns the style selector
 267     FrameView* view = m_document.view();
 268     if (view)
 269         m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType()));
 270     else
 271         m_medium = adoptPtr(new MediaQueryEvaluator("all"));
 272
 273     if (root)
 274         m_rootDefaultStyle = styleForElement(root, 0, DisallowStyleSharing, MatchOnlyUserAgentRules);
 275
 276     if (m_rootDefaultStyle && view)
 277         m_medium = adoptPtr(new MediaQueryEvaluator(view->mediaType(), &view->frame(), m_rootDefaultStyle.get()));
 278
 279     m_ruleSets.resetAuthorStyle();
 280
 281     DocumentStyleSheetCollection& styleSheetCollection = m_document.styleSheetCollection();
 282     m_ruleSets.initUserStyle(styleSheetCollection, *m_medium, *this);
 283
 284 #if ENABLE(SVG_FONTS)
 285     if (m_document.svgExtensions()) {
 286         const HashSet<SVGFontFaceElement*>& svgFontFaceElements = m_document.svgExtensions()->svgFontFaceElements();
 287         HashSet<SVGFontFaceElement*>::const_iterator end = svgFontFaceElements.end();
 288         for (HashSet<SVGFontFaceElement*>::const_iterator it = svgFontFaceElements.begin(); it != end; ++it)
 289             fontSelector()->addFontFaceRule((*it)->fontFaceRule());
 290     }
 291 #endif
 292
 293     appendAuthorStyleSheets(0, styleSheetCollection.activeAuthorStyleSheets());
 294 }
 295
 296 void StyleResolver::appendAuthorStyleSheets(unsigned firstNew, const Vector<RefPtr<CSSStyleSheet>>& styleSheets)
 297 {
 298     m_ruleSets.appendAuthorStyleSheets(firstNew, styleSheets, m_medium.get(), m_inspectorCSSOMWrappers, document().isViewSource(), this);
 299     if (auto renderView = document().renderView())
 300         renderView->style().font().update(fontSelector());
 301
 302 #if ENABLE(CSS_DEVICE_ADAPTATION)
 303     viewportStyleResolver()->resolve();
 304 #endif
 305 }
 306
 307 void StyleResolver::pushParentElement(Element* parent)
 308 {
 309     const ContainerNode* parentsParent = parent->parentOrShadowHostElement();
 310
 311     // We are not always invoked consistently. For example, script execution can cause us to enter
 312     // style recalc in the middle of tree building. We may also be invoked from somewhere within the tree.
 313     // Reset the stack in this case, or if we see a new root element.
 314     // Otherwise just push the new parent.
 315     if (!parentsParent || m_selectorFilter.parentStackIsEmpty())
 316         m_selectorFilter.setupParentStack(parent);
 317     else
 318         m_selectorFilter.pushParent(parent);
 319
 320     // Note: We mustn't skip ShadowRoot nodes for the scope stack.
 321     if (m_scopeResolver)
 322         m_scopeResolver->push(parent, parent->parentOrShadowHostNode());
 323 }
 324
 325 void StyleResolver::popParentElement(Element* parent)
 326 {
 327     // Note that we may get invoked for some random elements in some wacky cases during style resolve.
 328     // Pause maintaining the stack in this case.
 329     if (m_selectorFilter.parentStackIsConsistent(parent))
 330         m_selectorFilter.popParent();
 331     if (m_scopeResolver)
 332         m_scopeResolver->pop(parent);
 333 }
 334
 335 void StyleResolver::pushParentShadowRoot(const ShadowRoot* shadowRoot)
 336 {
 337     ASSERT(shadowRoot->hostElement());
 338     if (m_scopeResolver)
 339         m_scopeResolver->push(shadowRoot, shadowRoot->hostElement());
 340 }
 341
 342 void StyleResolver::popParentShadowRoot(const ShadowRoot* shadowRoot)
 343 {
 344     ASSERT(shadowRoot->hostElement());
 345     if (m_scopeResolver)
 346         m_scopeResolver->pop(shadowRoot);
 347 }
 348
 349 // This is a simplified style setting function for keyframe styles
 350 void StyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
 351 {
 352     AtomicString s(rule->name());
 353     m_keyframesRuleMap.set(s.impl(), rule);
 354 }
 355
 356 StyleResolver::~StyleResolver()
 357 {
 358     m_fontSelector->clearDocument();
 359
 360 #if ENABLE(CSS_DEVICE_ADAPTATION)
 361     m_viewportStyleResolver->clearDocument();
 362 #endif
 363 }
 364
 365 void StyleResolver::sweepMatchedPropertiesCache(Timer<StyleResolver>*)
 366 {
 367     // Look for cache entries containing a style declaration with a single ref and remove them.
 368     // This may happen when an element attribute mutation causes it to generate a new inlineStyle()
 369     // or presentationAttributeStyle(), potentially leaving this cache with the last ref on the old one.
 370     Vector<unsigned, 16> toRemove;
 371     MatchedPropertiesCache::iterator it = m_matchedPropertiesCache.begin();
 372     MatchedPropertiesCache::iterator end = m_matchedPropertiesCache.end();
 373     for (; it != end; ++it) {
 374         Vector<MatchedProperties>& matchedProperties = it->value.matchedProperties;
 375         for (size_t i = 0; i < matchedProperties.size(); ++i) {
 376             if (matchedProperties[i].properties->hasOneRef()) {
 377                 toRemove.append(it->key);
 378                 break;
 379             }
 380         }
 381     }
 382     for (size_t i = 0; i < toRemove.size(); ++i)
 383         m_matchedPropertiesCache.remove(toRemove[i]);
 384
 385     m_matchedPropertiesCacheAdditionsSinceLastSweep = 0;
 386 }
 387
 388 inline bool StyleResolver::styleSharingCandidateMatchesHostRules()
 389 {
 390 #if ENABLE(SHADOW_DOM)
 391     return m_scopeResolver && m_scopeResolver->styleSharingCandidateMatchesHostRules(m_state.element());
 392 #else
 393     return false;
 394 #endif
 395 }
 396
 397 bool StyleResolver::classNamesAffectedByRules(const SpaceSplitString& classNames) const
 398 {
 399     for (unsigned i = 0; i < classNames.size(); ++i) {
 400         if (m_ruleSets.features().classesInRules.contains(classNames[i].impl()))
 401             return true;
 402     }
 403     return false;
 404 }
 405
 406 inline void StyleResolver::State::initElement(Element* e)
 407 {
 408     m_element = e;
 409     m_styledElement = e && e->isStyledElement() ? toStyledElement(e) : nullptr;
 410     m_elementLinkState = e ? e->document().visitedLinkState().determineLinkState(e) : NotInsideLink;
 411 }
 412
 413 inline void StyleResolver::initElement(Element* e)
 414 {
 415     if (m_state.element() != e) {
 416         m_state.initElement(e);
 417         if (e && e == e->document().documentElement()) {
 418             e->document().setDirectionSetOnDocumentElement(false);
 419             e->document().setWritingModeSetOnDocumentElement(false);
 420         }
 421     }
 422 }
 423
 424 inline void StyleResolver::State::initForStyleResolve(Document& document, Element* e, RenderStyle* parentStyle, RenderRegion* regionForStyling)
 425 {
 426     m_regionForStyling = regionForStyling;
 427
 428     if (e) {
 429         m_parentNode = NodeRenderingTraversal::parent(e);
 430         bool resetStyleInheritance = hasShadowRootParent(*e) && toShadowRoot(e->parentNode())->resetStyleInheritance();
 431         m_parentStyle = resetStyleInheritance ? 0 :
 432             parentStyle ? parentStyle :
 433             m_parentNode ? m_parentNode->renderStyle() : 0;
 434     } else {
 435         m_parentNode = 0;
 436         m_parentStyle = parentStyle;
 437     }
 438
 439     Node* docElement = e ? e->document().documentElement() : 0;
 440     RenderStyle* docStyle = document.renderStyle();
 441     m_rootElementStyle = docElement && e != docElement ? docElement->renderStyle() : docStyle;
 442
 443     m_style = 0;
 444     m_pendingImageProperties.clear();
 445     m_fontDirty = false;
 446 }
 447
 448 static const unsigned cStyleSearchThreshold = 10;
 449 static const unsigned cStyleSearchLevelThreshold = 10;
 450
 451 static inline bool parentElementPreventsSharing(const Element* parentElement)
 452 {
 453     if (!parentElement)
 454         return false;
 455     return parentElement->hasFlagsSetDuringStylingOfChildren();
 456 }
 457
 458 Node* StyleResolver::locateCousinList(Element* parent, unsigned& visitedNodeCount) const
 459 {
 460     if (visitedNodeCount >= cStyleSearchThreshold * cStyleSearchLevelThreshold)
 461         return 0;
 462     if (!parent || !parent->isStyledElement())
 463         return 0;
 464     StyledElement* p = toStyledElement(parent);
 465     if (p->inlineStyle())
 466         return 0;
 467 #if ENABLE(SVG)
 468     if (p->isSVGElement() && toSVGElement(p)->animatedSMILStyleProperties())
 469         return 0;
 470 #endif
 471     if (p->hasID() && m_ruleSets.features().idsInRules.contains(p->idForStyleResolution().impl()))
 472         return 0;
 473
 474     RenderStyle* parentStyle = p->renderStyle();
 475     unsigned subcount = 0;
 476     Node* thisCousin = p;
 477     Node* currentNode = p->previousSibling();
 478
 479     // Reserve the tries for this level. This effectively makes sure that the algorithm
 480     // will never go deeper than cStyleSearchLevelThreshold levels into recursion.
 481     visitedNodeCount += cStyleSearchThreshold;
 482     while (thisCousin) {
 483         while (currentNode) {
 484             ++subcount;
 485             if (currentNode->renderStyle() == parentStyle && currentNode->lastChild()
 486                 && currentNode->isElementNode() && !parentElementPreventsSharing(toElement(currentNode))
 487 #if ENABLE(SHADOW_DOM)
 488                 && !toElement(currentNode)->authorShadowRoot()
 489 #endif
 490                 ) {
 491                 // Adjust for unused reserved tries.
 492                 visitedNodeCount -= cStyleSearchThreshold - subcount;
 493                 return currentNode->lastChild();
 494             }
 495             if (subcount >= cStyleSearchThreshold)
 496                 return 0;
 497             currentNode = currentNode->previousSibling();
 498         }
 499         currentNode = locateCousinList(thisCousin->parentElement(), visitedNodeCount);
 500         thisCousin = currentNode;
 501     }
 502
 503     return 0;
 504 }
 505
 506 bool StyleResolver::styleSharingCandidateMatchesRuleSet(RuleSet* ruleSet)
 507 {
 508     if (!ruleSet)
 509         return false;
 510
 511     ElementRuleCollector collector(this, m_state);
 512     return collector.hasAnyMatchingRules(ruleSet);
 513 }
 514
 515 bool StyleResolver::canShareStyleWithControl(StyledElement* element) const
 516 {
 517     const State& state = m_state;
 518     HTMLInputElement* thisInputElement = element->toInputElement();
 519     HTMLInputElement* otherInputElement = state.element()->toInputElement();
 520
 521     if (!thisInputElement || !otherInputElement)
 522         return false;
 523
 524     if (thisInputElement->elementData() != otherInputElement->elementData()) {
 525         if (thisInputElement->fastGetAttribute(typeAttr) != otherInputElement->fastGetAttribute(typeAttr))
 526             return false;
 527         if (thisInputElement->fastGetAttribute(readonlyAttr) != otherInputElement->fastGetAttribute(readonlyAttr))
 528             return false;
 529     }
 530
 531     if (thisInputElement->isAutofilled() != otherInputElement->isAutofilled())
 532         return false;
 533     if (thisInputElement->shouldAppearChecked() != otherInputElement->shouldAppearChecked())
 534         return false;
 535     if (thisInputElement->shouldAppearIndeterminate() != otherInputElement->shouldAppearIndeterminate())
 536         return false;
 537     if (thisInputElement->isRequired() != otherInputElement->isRequired())
 538         return false;
 539
 540     if (element->isDisabledFormControl() != state.element()->isDisabledFormControl())
 541         return false;
 542
 543     if (element->isDefaultButtonForForm() != state.element()->isDefaultButtonForForm())
 544         return false;
 545
 546     if (state.document().containsValidityStyleRules()) {
 547         bool willValidate = element->willValidate();
 548
 549         if (willValidate != state.element()->willValidate())
 550             return false;
 551
 552         if (willValidate && (element->isValidFormControlElement() != state.element()->isValidFormControlElement()))
 553             return false;
 554
 555         if (element->isInRange() != state.element()->isInRange())
 556             return false;
 557
 558         if (element->isOutOfRange() != state.element()->isOutOfRange())
 559             return false;
 560     }
 561
 562     return true;
 563 }
 564
 565 static inline bool elementHasDirectionAuto(Element* element)
 566 {
 567     // FIXME: This line is surprisingly hot, we may wish to inline hasDirectionAuto into StyleResolver.
 568     return element->isHTMLElement() && toHTMLElement(element)->hasDirectionAuto();
 569 }
 570
 571 bool StyleResolver::sharingCandidateHasIdenticalStyleAffectingAttributes(StyledElement* sharingCandidate) const
 572 {
 573     const State& state = m_state;
 574     if (state.element()->elementData() == sharingCandidate->elementData())
 575         return true;
 576     if (state.element()->fastGetAttribute(XMLNames::langAttr) != sharingCandidate->fastGetAttribute(XMLNames::langAttr))
 577         return false;
 578     if (state.element()->fastGetAttribute(langAttr) != sharingCandidate->fastGetAttribute(langAttr))
 579         return false;
 580
 581     if (!state.elementAffectedByClassRules()) {
 582         if (sharingCandidate->hasClass() && classNamesAffectedByRules(sharingCandidate->classNames()))
 583             return false;
 584     } else if (sharingCandidate->hasClass()) {
 585 #if ENABLE(SVG)
 586         // SVG elements require a (slow!) getAttribute comparision because "class" is an animatable attribute for SVG.
 587         if (state.element()->isSVGElement()) {
 588             if (state.element()->getAttribute(classAttr) != sharingCandidate->getAttribute(classAttr))
 589                 return false;
 590         } else {
 591 #endif
 592             if (state.element()->classNames() != sharingCandidate->classNames())
 593                 return false;
 594 #if ENABLE(SVG)
 595         }
 596 #endif
 597     } else
 598         return false;
 599
 600     if (state.styledElement()->presentationAttributeStyle() != sharingCandidate->presentationAttributeStyle())
 601         return false;
 602
 603 #if ENABLE(PROGRESS_ELEMENT)
 604     if (state.element()->hasTagName(progressTag)) {
 605         if (state.element()->shouldAppearIndeterminate() != sharingCandidate->shouldAppearIndeterminate())
 606             return false;
 607     }
 608 #endif
 609
 610     return true;
 611 }
 612
 613 bool StyleResolver::canShareStyleWithElement(StyledElement* element) const
 614 {
 615     RenderStyle* style = element->renderStyle();
 616     const State& state = m_state;
 617
 618     if (!style)
 619         return false;
 620     if (style->unique())
 621         return false;
 622     if (style->hasUniquePseudoStyle())
 623         return false;
 624     if (element->tagQName() != state.element()->tagQName())
 625         return false;
 626     if (element->inlineStyle())
 627         return false;
 628     if (element->needsStyleRecalc())
 629         return false;
 630 #if ENABLE(SVG)
 631     if (element->isSVGElement() && toSVGElement(element)->animatedSMILStyleProperties())
 632         return false;
 633 #endif
 634     if (element->isLink() != state.element()->isLink())
 635         return false;
 636     if (element->hovered() != state.element()->hovered())
 637         return false;
 638     if (element->active() != state.element()->active())
 639         return false;
 640     if (element->focused() != state.element()->focused())
 641         return false;
 642     if (element->shadowPseudoId() != state.element()->shadowPseudoId())
 643         return false;
 644     if (element == element->document().cssTarget())
 645         return false;
 646     if (!sharingCandidateHasIdenticalStyleAffectingAttributes(element))
 647         return false;
 648     if (element->additionalPresentationAttributeStyle() != state.styledElement()->additionalPresentationAttributeStyle())
 649         return false;
 650
 651     if (element->hasID() && m_ruleSets.features().idsInRules.contains(element->idForStyleResolution().impl()))
 652         return false;
 653
 654     // FIXME: We should share style for option and optgroup whenever possible.
 655     // Before doing so, we need to resolve issues in HTMLSelectElement::recalcListItems
 656     // and RenderMenuList::setText. See also https://bugs.webkit.org/show_bug.cgi?id=88405
 657     if (isHTMLOptionElement(element) || isHTMLOptGroupElement(element))
 658         return false;
 659
 660     bool isControl = element->isFormControlElement();
 661
 662     if (isControl != state.element()->isFormControlElement())
 663         return false;
 664
 665     if (isControl && !canShareStyleWithControl(element))
 666         return false;
 667
 668     if (style->transitions() || style->animations())
 669         return false;
 670
 671 #if USE(ACCELERATED_COMPOSITING)
 672     // Turn off style sharing for elements that can gain layers for reasons outside of the style system.
 673     // See comments in RenderObject::setStyle().
 674     if (element->hasTagName(iframeTag) || element->hasTagName(frameTag) || element->hasTagName(embedTag) || element->hasTagName(objectTag) || element->hasTagName(appletTag) || element->hasTagName(canvasTag))
 675         return false;
 676
 677 #if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
 678     // With proxying, the media elements are backed by a RenderEmbeddedObject.
 679     if ((element->hasTagName(videoTag) || element->hasTagName(audioTag)) && toMediaElement(element)->shouldUseVideoPluginProxy())
 680         return false;
 681 #endif
 682
 683 #endif
 684
 685     if (elementHasDirectionAuto(element))
 686         return false;
 687
 688     if (element->isLink() && state.elementLinkState() != style->insideLink())
 689         return false;
 690
 691 #if ENABLE(VIDEO_TRACK)
 692     // Deny sharing styles between WebVTT and non-WebVTT nodes.
 693     if (element->isWebVTTElement() != state.element()->isWebVTTElement())
 694         return false;
 695
 696     if (element->isWebVTTElement() && state.element()->isWebVTTElement() && toWebVTTElement(element)->isPastNode() != toWebVTTElement(state.element())->isPastNode())
 697         return false;
 698 #endif
 699
 700 #if ENABLE(FULLSCREEN_API)
 701     if (element == element->document().webkitCurrentFullScreenElement() || state.element() == state.document().webkitCurrentFullScreenElement())
 702         return false;
 703 #endif
 704     return true;
 705 }
 706
 707 inline StyledElement* StyleResolver::findSiblingForStyleSharing(Node* node, unsigned& count) const
 708 {
 709     for (; node; node = node->previousSibling()) {
 710         if (!node->isStyledElement())
 711             continue;
 712         if (canShareStyleWithElement(toStyledElement(node)))
 713             break;
 714         if (count++ == cStyleSearchThreshold)
 715             return 0;
 716     }
 717     return toStyledElement(node);
 718 }
 719
 720 RenderStyle* StyleResolver::locateSharedStyle()
 721 {
 722     State& state = m_state;
 723     if (!state.styledElement() || !state.parentStyle())
 724         return 0;
 725
 726     // If the element has inline style it is probably unique.
 727     if (state.styledElement()->inlineStyle())
 728         return 0;
 729 #if ENABLE(SVG)
 730     if (state.styledElement()->isSVGElement() && toSVGElement(state.styledElement())->animatedSMILStyleProperties())
 731         return 0;
 732 #endif
 733     // Ids stop style sharing if they show up in the stylesheets.
 734     if (state.styledElement()->hasID() && m_ruleSets.features().idsInRules.contains(state.styledElement()->idForStyleResolution().impl()))
 735         return 0;
 736     if (parentElementPreventsSharing(state.element()->parentElement()))
 737         return 0;
 738     if (state.element() == state.document().cssTarget())
 739         return 0;
 740     if (elementHasDirectionAuto(state.element()))
 741         return 0;
 742
 743     // Cache whether state.element is affected by any known class selectors.
 744     // FIXME: This shouldn't be a member variable. The style sharing code could be factored out of StyleResolver.
 745     state.setElementAffectedByClassRules(state.element() && state.element()->hasClass() && classNamesAffectedByRules(state.element()->classNames()));
 746
 747     // Check previous siblings and their cousins.
 748     unsigned count = 0;
 749     unsigned visitedNodeCount = 0;
 750     StyledElement* shareElement = 0;
 751     Node* cousinList = state.styledElement()->previousSibling();
 752     while (cousinList) {
 753         shareElement = findSiblingForStyleSharing(cousinList, count);
 754         if (shareElement)
 755             break;
 756         cousinList = locateCousinList(cousinList->parentElement(), visitedNodeCount);
 757     }
 758
 759     // If we have exhausted all our budget or our cousins.
 760     if (!shareElement)
 761         return 0;
 762
 763     // Can't share if sibling rules apply. This is checked at the end as it should rarely fail.
 764     if (styleSharingCandidateMatchesRuleSet(m_ruleSets.sibling()))
 765         return 0;
 766     // Can't share if attribute rules apply.
 767     if (styleSharingCandidateMatchesRuleSet(m_ruleSets.uncommonAttribute()))
 768         return 0;
 769     // Can't share if @host @-rules apply.
 770     if (styleSharingCandidateMatchesHostRules())
 771         return 0;
 772     // Tracking child index requires unique style for each node. This may get set by the sibling rule match above.
 773     if (parentElementPreventsSharing(state.element()->parentElement()))
 774         return 0;
 775     return shareElement->renderStyle();
 776 }
 777
 778 static inline bool isAtShadowBoundary(const Element* element)
 779 {
 780     if (!element)
 781         return false;
 782     ContainerNode* parentNode = element->parentNode();
 783     return parentNode && parentNode->isShadowRoot();
 784 }
 785
 786 PassRef<RenderStyle> StyleResolver::styleForElement(Element* element, RenderStyle* defaultParent,
 787     StyleSharingBehavior sharingBehavior, RuleMatchingBehavior matchingBehavior, RenderRegion* regionForStyling)
 788 {
 789     // Once an element has a renderer, we don't try to destroy it, since otherwise the renderer
 790     // will vanish if a style recalc happens during loading.
 791     if (sharingBehavior == AllowStyleSharing && !element->document().haveStylesheetsLoaded() && !element->renderer()) {
 792         if (!s_styleNotYetAvailable) {
 793             s_styleNotYetAvailable = &RenderStyle::create().leakRef();
 794             s_styleNotYetAvailable->setDisplay(NONE);
 795             s_styleNotYetAvailable->font().update(m_fontSelector);
 796         }
 797         element->document().setHasNodesWithPlaceholderStyle();
 798         return *s_styleNotYetAvailable;
 799     }
 800
 801     State& state = m_state;
 802     initElement(element);
 803     state.initForStyleResolve(document(), element, defaultParent, regionForStyling);
 804     if (sharingBehavior == AllowStyleSharing) {
 805         if (RenderStyle* sharedStyle = locateSharedStyle()) {
 806             state.clear();
 807             return *sharedStyle;
 808         }
 809     }
 810
 811     if (state.parentStyle()) {
 812         state.setStyle(RenderStyle::create());
 813         state.style()->inheritFrom(state.parentStyle(), isAtShadowBoundary(element) ? RenderStyle::AtShadowBoundary : RenderStyle::NotAtShadowBoundary);
 814     } else {
 815         state.setStyle(defaultStyleForElement());
 816         state.setParentStyle(RenderStyle::clone(state.style()));
 817     }
 818
 819     if (element->isLink()) {
 820         state.style()->setIsLink(true);
 821         EInsideLink linkState = state.elementLinkState();
 822         if (linkState != NotInsideLink) {
 823             bool forceVisited = InspectorInstrumentation::forcePseudoState(element, CSSSelector::PseudoVisited);
 824             if (forceVisited)
 825                 linkState = InsideVisitedLink;
 826         }
 827         state.style()->setInsideLink(linkState);
 828     }
 829
 830     bool needsCollection = false;
 831     CSSDefaultStyleSheets::ensureDefaultStyleSheetsForElement(element, needsCollection);
 832     if (needsCollection)
 833         m_ruleSets.collectFeatures(document().isViewSource(), m_scopeResolver.get());
 834
 835     ElementRuleCollector collector(this, state);
 836     collector.setRegionForStyling(regionForStyling);
 837     collector.setMedium(m_medium.get());
 838
 839     if (matchingBehavior == MatchOnlyUserAgentRules)
 840         collector.matchUARules();
 841     else
 842         collector.matchAllRules(m_matchAuthorAndUserStyles, matchingBehavior != MatchAllRulesExcludingSMIL);
 843
 844     applyMatchedProperties(collector.matchedResult(), element);
 845
 846     // Clean up our style object's display and text decorations (among other fixups).
 847     adjustRenderStyle(state.style(), state.parentStyle(), element);
 848
 849     state.clear(); // Clear out for the next resolve.
 850
 851     document().didAccessStyleResolver();
 852
 853     // Now return the style.
 854     return state.takeStyle();
 855 }
 856
 857 PassRef<RenderStyle> StyleResolver::styleForKeyframe(const RenderStyle* elementStyle, const StyleKeyframe* keyframe, KeyframeValue& keyframeValue)
 858 {
 859     MatchResult result;
 860     result.addMatchedProperties(keyframe->properties());
 861
 862     ASSERT(!m_state.style());
 863
 864     State& state = m_state;
 865
 866     // Create the style
 867     state.setStyle(RenderStyle::clone(elementStyle));
 868     state.setLineHeightValue(0);
 869
 870     // We don't need to bother with !important. Since there is only ever one
 871     // decl, there's nothing to override. So just add the first properties.
 872     bool inheritedOnly = false;
 873     applyMatchedProperties<HighPriorityProperties>(result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
 874
 875     // If our font got dirtied, go ahead and update it now.
 876     updateFont();
 877
 878     // Line-height is set when we are sure we decided on the font-size
 879     if (state.lineHeightValue())
 880         applyProperty(CSSPropertyLineHeight, state.lineHeightValue());
 881
 882     // Now do rest of the properties.
 883     applyMatchedProperties<LowPriorityProperties>(result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
 884
 885     // If our font got dirtied by one of the non-essential font props,
 886     // go ahead and update it a second time.
 887     updateFont();
 888
 889     // Start loading resources referenced by this style.
 890     loadPendingResources();
 891
 892     // Add all the animating properties to the keyframe.
 893     unsigned propertyCount = keyframe->properties().propertyCount();
 894     for (unsigned i = 0; i < propertyCount; ++i) {
 895         CSSPropertyID property = keyframe->properties().propertyAt(i).id();
 896         // Timing-function within keyframes is special, because it is not animated; it just
 897         // describes the timing function between this keyframe and the next.
 898         if (property != CSSPropertyWebkitAnimationTimingFunction)
 899             keyframeValue.addProperty(property);
 900     }
 901
 902     document().didAccessStyleResolver();
 903
 904     return state.takeStyle();
 905 }
 906
 907 void StyleResolver::keyframeStylesForAnimation(Element* e, const RenderStyle* elementStyle, KeyframeList& list)
 908 {
 909     list.clear();
 910
 911     // Get the keyframesRule for this name
 912     if (!e || list.animationName().isEmpty())
 913         return;
 914
 915     m_keyframesRuleMap.checkConsistency();
 916
 917     KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(list.animationName().impl());
 918     if (it == m_keyframesRuleMap.end())
 919         return;
 920
 921     const StyleRuleKeyframes* keyframesRule = it->value.get();
 922
 923     // Construct and populate the style for each keyframe
 924     const Vector<RefPtr<StyleKeyframe>>& keyframes = keyframesRule->keyframes();
 925     for (unsigned i = 0; i < keyframes.size(); ++i) {
 926         // Apply the declaration to the style. This is a simplified version of the logic in styleForElement
 927         initElement(e);
 928         m_state.initForStyleResolve(document(), e);
 929
 930         const StyleKeyframe* keyframe = keyframes[i].get();
 931
 932         KeyframeValue keyframeValue(0, 0);
 933         keyframeValue.setStyle(styleForKeyframe(elementStyle, keyframe, keyframeValue));
 934
 935         // Add this keyframe style to all the indicated key times
 936         Vector<double> keys;
 937         keyframe->getKeys(keys);
 938         for (size_t keyIndex = 0; keyIndex < keys.size(); ++keyIndex) {
 939             keyframeValue.setKey(keys[keyIndex]);
 940             list.insert(keyframeValue);
 941         }
 942     }
 943
 944     // If the 0% keyframe is missing, create it (but only if there is at least one other keyframe)
 945     int initialListSize = list.size();
 946     if (initialListSize > 0 && list[0].key()) {
 947         static StyleKeyframe* zeroPercentKeyframe;
 948         if (!zeroPercentKeyframe) {
 949             zeroPercentKeyframe = StyleKeyframe::create(MutableStyleProperties::create()).leakRef();
 950             zeroPercentKeyframe->setKeyText("0%");
 951         }
 952         KeyframeValue keyframeValue(0, 0);
 953         keyframeValue.setStyle(styleForKeyframe(elementStyle, zeroPercentKeyframe, keyframeValue));
 954         list.insert(keyframeValue);
 955     }
 956
 957     // If the 100% keyframe is missing, create it (but only if there is at least one other keyframe)
 958     if (initialListSize > 0 && (list[list.size() - 1].key() != 1)) {
 959         static StyleKeyframe* hundredPercentKeyframe;
 960         if (!hundredPercentKeyframe) {
 961             hundredPercentKeyframe = StyleKeyframe::create(MutableStyleProperties::create()).leakRef();
 962             hundredPercentKeyframe->setKeyText("100%");
 963         }
 964         KeyframeValue keyframeValue(1, 0);
 965         keyframeValue.setStyle(styleForKeyframe(elementStyle, hundredPercentKeyframe, keyframeValue));
 966         list.insert(keyframeValue);
 967     }
 968 }
 969
 970 PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* e, const PseudoStyleRequest& pseudoStyleRequest, RenderStyle* parentStyle)
 971 {
 972     ASSERT(parentStyle);
 973     if (!e)
 974         return 0;
 975
 976     State& state = m_state;
 977
 978     initElement(e);
 979
 980     state.initForStyleResolve(document(), e, parentStyle);
 981
 982     if (m_state.parentStyle()) {
 983         state.setStyle(RenderStyle::create());
 984         state.style()->inheritFrom(m_state.parentStyle());
 985     } else {
 986         state.setStyle(defaultStyleForElement());
 987         state.setParentStyle(RenderStyle::clone(state.style()));
 988     }
 989
 990     // Since we don't use pseudo-elements in any of our quirk/print user agent rules, don't waste time walking
 991     // those rules.
 992
 993     // Check UA, user and author rules.
 994     ElementRuleCollector collector(this, state);
 995     collector.setPseudoStyleRequest(pseudoStyleRequest);
 996     collector.setMedium(m_medium.get());
 997     collector.matchUARules();
 998
 999     if (m_matchAuthorAndUserStyles) {
1000         collector.matchUserRules(false);
1001         collector.matchAuthorRules(false);
1002     }
1003
1004     if (collector.matchedResult().matchedProperties.isEmpty())
1005         return 0;
1006
1007     state.style()->setStyleType(pseudoStyleRequest.pseudoId);
1008
1009     applyMatchedProperties(collector.matchedResult(), e);
1010
1011     // Clean up our style object's display and text decorations (among other fixups).
1012     adjustRenderStyle(state.style(), m_state.parentStyle(), 0);
1013
1014     // Start loading resources referenced by this style.
1015     loadPendingResources();
1016
1017     document().didAccessStyleResolver();
1018
1019     // Now return the style.
1020     return state.takeStyle();
1021 }
1022
1023 PassRef<RenderStyle> StyleResolver::styleForPage(int pageIndex)
1024 {
1025     m_state.initForStyleResolve(document(), document().documentElement()); // m_rootElementStyle will be set to the document style.
1026
1027     m_state.setStyle(RenderStyle::create());
1028     m_state.style()->inheritFrom(m_state.rootElementStyle());
1029
1030     PageRuleCollector collector(m_state, m_ruleSets);
1031     collector.matchAllPageRules(pageIndex);
1032     m_state.setLineHeightValue(0);
1033     bool inheritedOnly = false;
1034
1035     MatchResult& result = collector.matchedResult();
1036     applyMatchedProperties<HighPriorityProperties>(result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
1037
1038     // If our font got dirtied, go ahead and update it now.
1039     updateFont();
1040
1041     // Line-height is set when we are sure we decided on the font-size.
1042     if (m_state.lineHeightValue())
1043         applyProperty(CSSPropertyLineHeight, m_state.lineHeightValue());
1044
1045     applyMatchedProperties<LowPriorityProperties>(result, false, 0, result.matchedProperties.size() - 1, inheritedOnly);
1046
1047     // Start loading resources referenced by this style.
1048     loadPendingResources();
1049
1050     document().didAccessStyleResolver();
1051
1052     // Now return the style.
1053     return m_state.takeStyle();
1054 }
1055
1056 PassRef<RenderStyle> StyleResolver::defaultStyleForElement()
1057 {
1058     m_state.setStyle(RenderStyle::create());
1059     // Make sure our fonts are initialized if we don't inherit them from our parent style.
1060     if (Settings* settings = documentSettings()) {
1061         initializeFontStyle(settings);
1062         m_state.style()->font().update(fontSelector());
1063     } else
1064         m_state.style()->font().update(0);
1065
1066     return m_state.takeStyle();
1067 }
1068
1069 static void addIntrinsicMargins(RenderStyle* style)
1070 {
1071     // Intrinsic margin value.
1072     const int intrinsicMargin = 2 * style->effectiveZoom();
1073
1074     // FIXME: Using width/height alone and not also dealing with min-width/max-width is flawed.
1075     // FIXME: Using "quirk" to decide the margin wasn't set is kind of lame.
1076     if (style->width().isIntrinsicOrAuto()) {
1077         if (style->marginLeft().quirk())
1078             style->setMarginLeft(Length(intrinsicMargin, Fixed));
1079         if (style->marginRight().quirk())
1080             style->setMarginRight(Length(intrinsicMargin, Fixed));
1081     }
1082
1083     if (style->height().isAuto()) {
1084         if (style->marginTop().quirk())
1085             style->setMarginTop(Length(intrinsicMargin, Fixed));
1086         if (style->marginBottom().quirk())
1087             style->setMarginBottom(Length(intrinsicMargin, Fixed));
1088     }
1089 }
1090
1091 static EDisplay equivalentBlockDisplay(EDisplay display, bool isFloating, bool strictParsing)
1092 {
1093     switch (display) {
1094     case BLOCK:
1095     case TABLE:
1096     case BOX:
1097     case FLEX:
1098     case GRID:
1099         return display;
1100
1101     case LIST_ITEM:
1102         // It is a WinIE bug that floated list items lose their bullets, so we'll emulate the quirk, but only in quirks mode.
1103         if (!strictParsing && isFloating)
1104             return BLOCK;
1105         return display;
1106     case INLINE_TABLE:
1107         return TABLE;
1108     case INLINE_BOX:
1109         return BOX;
1110     case INLINE_FLEX:
1111         return FLEX;
1112     case INLINE_GRID:
1113         return GRID;
1114
1115     case INLINE:
1116     case RUN_IN:
1117     case COMPACT:
1118     case INLINE_BLOCK:
1119     case TABLE_ROW_GROUP:
1120     case TABLE_HEADER_GROUP:
1121     case TABLE_FOOTER_GROUP:
1122     case TABLE_ROW:
1123     case TABLE_COLUMN_GROUP:
1124     case TABLE_COLUMN:
1125     case TABLE_CELL:
1126     case TABLE_CAPTION:
1127         return BLOCK;
1128     case NONE:
1129         ASSERT_NOT_REACHED();
1130         return NONE;
1131     }
1132     ASSERT_NOT_REACHED();
1133     return BLOCK;
1134 }
1135
1136 // CSS requires text-decoration to be reset at each DOM element for tables,
1137 // inline blocks, inline tables, run-ins, shadow DOM crossings, floating elements,
1138 // and absolute or relatively positioned elements.
1139 static bool doesNotInheritTextDecoration(RenderStyle* style, Element* e)
1140 {
1141     return style->display() == TABLE || style->display() == INLINE_TABLE || style->display() == RUN_IN
1142         || style->display() == INLINE_BLOCK || style->display() == INLINE_BOX || isAtShadowBoundary(e)
1143         || style->isFloating() || style->hasOutOfFlowPosition();
1144 }
1145
1146 static bool isDisplayFlexibleBox(EDisplay display)
1147 {
1148     return display == FLEX || display == INLINE_FLEX;
1149 }
1150
1151 #if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
1152 static bool isScrollableOverflow(EOverflow overflow)
1153 {
1154     return overflow == OSCROLL || overflow == OAUTO || overflow == OOVERLAY;
1155 }
1156 #endif
1157
1158 void StyleResolver::adjustRenderStyle(RenderStyle* style, RenderStyle* parentStyle, Element *e)
1159 {
1160     ASSERT(parentStyle);
1161
1162     // Cache our original display.
1163     style->setOriginalDisplay(style->display());
1164
1165     if (style->display() != NONE) {
1166         // If we have a <td> that specifies a float property, in quirks mode we just drop the float
1167         // property.
1168         // Sites also commonly use display:inline/block on <td>s and <table>s. In quirks mode we force
1169         // these tags to retain their display types.
1170         if (document().inQuirksMode() && e) {
1171             if (e->hasTagName(tdTag)) {
1172                 style->setDisplay(TABLE_CELL);
1173                 style->setFloating(NoFloat);
1174             } else if (isHTMLTableElement(e))
1175                 style->setDisplay(style->isDisplayInlineType() ? INLINE_TABLE : TABLE);
1176         }
1177
1178         if (e && (e->hasTagName(tdTag) || e->hasTagName(thTag))) {
1179             if (style->whiteSpace() == KHTML_NOWRAP) {
1180                 // Figure out if we are really nowrapping or if we should just
1181                 // use normal instead. If the width of the cell is fixed, then
1182                 // we don't actually use NOWRAP.
1183                 if (style->width().isFixed())
1184                     style->setWhiteSpace(NORMAL);
1185                 else
1186                     style->setWhiteSpace(NOWRAP);
1187             }
1188         }
1189
1190         // Tables never support the -webkit-* values for text-align and will reset back to the default.
1191         if (e && isHTMLTableElement(e) && (style->textAlign() == WEBKIT_LEFT || style->textAlign() == WEBKIT_CENTER || style->textAlign() == WEBKIT_RIGHT))
1192             style->setTextAlign(TASTART);
1193
1194         // Frames and framesets never honor position:relative or position:absolute. This is necessary to
1195         // fix a crash where a site tries to position these objects. They also never honor display.
1196         if (e && (e->hasTagName(frameTag) || e->hasTagName(framesetTag))) {
1197             style->setPosition(StaticPosition);
1198             style->setDisplay(BLOCK);
1199         }
1200
1201         // Ruby text does not support float or position. This might change with evolution of the specification.
1202         if (e && e->hasTagName(rtTag)) {
1203             style->setPosition(StaticPosition);
1204             style->setFloating(NoFloat);
1205         }
1206
1207         // FIXME: We shouldn't be overriding start/-webkit-auto like this. Do it in html.css instead.
1208         // Table headers with a text-align of -webkit-auto will change the text-align to center.
1209         if (e && e->hasTagName(thTag) && style->textAlign() == TASTART)
1210             style->setTextAlign(CENTER);
1211
1212         if (e && e->hasTagName(legendTag))
1213             style->setDisplay(BLOCK);
1214
1215         // Absolute/fixed positioned elements, floating elements and the document element need block-like outside display.
1216         if (style->hasOutOfFlowPosition() || style->isFloating() || (e && e->document().documentElement() == e))
1217             style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !document().inQuirksMode()));
1218
1219         // FIXME: Don't support this mutation for pseudo styles like first-letter or first-line, since it's not completely
1220         // clear how that should work.
1221         if (style->display() == INLINE && style->styleType() == NOPSEUDO && style->writingMode() != parentStyle->writingMode())
1222             style->setDisplay(INLINE_BLOCK);
1223
1224         // After performing the display mutation, check table rows. We do not honor position:relative or position:sticky on
1225         // table rows or cells. This has been established for position:relative in CSS2.1 (and caused a crash in containingBlock()
1226         // on some sites).
1227         if ((style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW_GROUP
1228             || style->display() == TABLE_FOOTER_GROUP || style->display() == TABLE_ROW)
1229             && style->hasInFlowPosition())
1230             style->setPosition(StaticPosition);
1231
1232         // writing-mode does not apply to table row groups, table column groups, table rows, and table columns.
1233         // FIXME: Table cells should be allowed to be perpendicular or flipped with respect to the table, though.
1234         if (style->display() == TABLE_COLUMN || style->display() == TABLE_COLUMN_GROUP || style->display() == TABLE_FOOTER_GROUP
1235             || style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW || style->display() == TABLE_ROW_GROUP
1236             || style->display() == TABLE_CELL)
1237             style->setWritingMode(parentStyle->writingMode());
1238
1239         // FIXME: Since we don't support block-flow on flexible boxes yet, disallow setting
1240         // of block-flow to anything other than TopToBottomWritingMode.
1241         // https://bugs.webkit.org/show_bug.cgi?id=46418 - Flexible box support.
1242         if (style->writingMode() != TopToBottomWritingMode && (style->display() == BOX || style->display() == INLINE_BOX))
1243             style->setWritingMode(TopToBottomWritingMode);
1244
1245         if (isDisplayFlexibleBox(parentStyle->display())) {
1246             style->setFloating(NoFloat);
1247             style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !document().inQuirksMode()));
1248         }
1249     }
1250
1251     // Make sure our z-index value is only applied if the object is positioned.
1252     if (style->position() == StaticPosition && !isDisplayFlexibleBox(parentStyle->display()))
1253         style->setHasAutoZIndex();
1254
1255     // Auto z-index becomes 0 for the root element and transparent objects. This prevents
1256     // cases where objects that should be blended as a single unit end up with a non-transparent
1257     // object wedged in between them. Auto z-index also becomes 0 for objects that specify transforms/masks/reflections.
1258     if (style->hasAutoZIndex() && ((e && e->document().documentElement() == e)
1259         || style->opacity() < 1.0f
1260         || style->hasTransformRelatedProperty()
1261         || style->hasMask()
1262         || style->clipPath()
1263         || style->boxReflect()
1264         || style->hasFilter()
1265         || style->hasBlendMode()
1266         || style->position() == StickyPosition
1267         || (style->position() == FixedPosition && e && e->document().page() && e->document().page()->settings().fixedPositionCreatesStackingContext())
1268         || style->hasFlowFrom()
1269         ))
1270         style->setZIndex(0);
1271
1272     // Textarea considers overflow visible as auto.
1273     if (e && isHTMLTextAreaElement(e)) {
1274         style->setOverflowX(style->overflowX() == OVISIBLE ? OAUTO : style->overflowX());
1275         style->setOverflowY(style->overflowY() == OVISIBLE ? OAUTO : style->overflowY());
1276     }
1277
1278     if (doesNotInheritTextDecoration(style, e))
1279         style->setTextDecorationsInEffect(style->textDecoration());
1280     else
1281         style->addToTextDecorationsInEffect(style->textDecoration());
1282
1283     // If either overflow value is not visible, change to auto.
1284     if (style->overflowX() == OMARQUEE && style->overflowY() != OMARQUEE)
1285         style->setOverflowY(OMARQUEE);
1286     else if (style->overflowY() == OMARQUEE && style->overflowX() != OMARQUEE)
1287         style->setOverflowX(OMARQUEE);
1288     else if (style->overflowX() == OVISIBLE && style->overflowY() != OVISIBLE) {
1289         // FIXME: Once we implement pagination controls, overflow-x should default to hidden
1290         // if overflow-y is set to -webkit-paged-x or -webkit-page-y. For now, we'll let it
1291         // default to auto so we can at least scroll through the pages.
1292         style->setOverflowX(OAUTO);
1293     } else if (style->overflowY() == OVISIBLE && style->overflowX() != OVISIBLE)
1294         style->setOverflowY(OAUTO);
1295
1296     // Call setStylesForPaginationMode() if a pagination mode is set for any non-root elements. If these
1297     // styles are specified on a root element, then they will be incorporated in
1298     // Style::createForDocument().
1299     if ((style->overflowY() == OPAGEDX || style->overflowY() == OPAGEDY) && !(e && (e->hasTagName(htmlTag) || e->hasTagName(bodyTag))))
1300         style->setColumnStylesFromPaginationMode(WebCore::paginationModeForRenderStyle(style));
1301
1302     // Table rows, sections and the table itself will support overflow:hidden and will ignore scroll/auto.
1303     // FIXME: Eventually table sections will support auto and scroll.
1304     if (style->display() == TABLE || style->display() == INLINE_TABLE
1305         || style->display() == TABLE_ROW_GROUP || style->display() == TABLE_ROW) {
1306         if (style->overflowX() != OVISIBLE && style->overflowX() != OHIDDEN)
1307             style->setOverflowX(OVISIBLE);
1308         if (style->overflowY() != OVISIBLE && style->overflowY() != OHIDDEN)
1309             style->setOverflowY(OVISIBLE);
1310     }
1311
1312     // Menulists should have visible overflow
1313     if (style->appearance() == MenulistPart) {
1314         style->setOverflowX(OVISIBLE);
1315         style->setOverflowY(OVISIBLE);
1316     }
1317
1318 #if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
1319     // Touch overflow scrolling creates a stacking context.
1320     if (style->hasAutoZIndex() && style->useTouchOverflowScrolling() && (isScrollableOverflow(style->overflowX()) || isScrollableOverflow(style->overflowY())))
1321         style->setZIndex(0);
1322 #endif
1323
1324     // Cull out any useless layers and also repeat patterns into additional layers.
1325     style->adjustBackgroundLayers();
1326     style->adjustMaskLayers();
1327
1328     // Do the same for animations and transitions.
1329     style->adjustAnimations();
1330     style->adjustTransitions();
1331
1332     // Important: Intrinsic margins get added to controls before the theme has adjusted the style, since the theme will
1333     // alter fonts and heights/widths.
1334     if (e && e->isFormControlElement() && style->fontSize() >= 11) {
1335         // Don't apply intrinsic margins to image buttons. The designer knows how big the images are,
1336         // so we have to treat all image buttons as though they were explicitly sized.
1337         if (!isHTMLInputElement(e) || !toHTMLInputElement(e)->isImageButton())
1338             addIntrinsicMargins(style);
1339     }
1340
1341     // Let the theme also have a crack at adjusting the style.
1342     if (style->hasAppearance())
1343         RenderTheme::defaultTheme()->adjustStyle(this, style, e, m_state.hasUAAppearance(), m_state.borderData(), m_state.backgroundData(), m_state.backgroundColor());
1344
1345     // If we have first-letter pseudo style, do not share this style.
1346     if (style->hasPseudoStyle(FIRST_LETTER))
1347         style->setUnique();
1348
1349     // FIXME: when dropping the -webkit prefix on transform-style, we should also have opacity < 1 cause flattening.
1350     if (style->preserves3D() && (style->overflowX() != OVISIBLE
1351         || style->overflowY() != OVISIBLE
1352         || style->hasFilter()))
1353         style->setTransformStyle3D(TransformStyle3DFlat);
1354
1355     // Seamless iframes behave like blocks. Map their display to inline-block when marked inline.
1356     if (e && e->hasTagName(iframeTag) && style->display() == INLINE && toHTMLIFrameElement(e)->shouldDisplaySeamlessly())
1357         style->setDisplay(INLINE_BLOCK);
1358
1359     adjustGridItemPosition(style, parentStyle);
1360
1361 #if ENABLE(SVG)
1362     if (e && e->isSVGElement()) {
1363         // Spec: http://www.w3.org/TR/SVG/masking.html#OverflowProperty
1364         if (style->overflowY() == OSCROLL)
1365             style->setOverflowY(OHIDDEN);
1366         else if (style->overflowY() == OAUTO)
1367             style->setOverflowY(OVISIBLE);
1368
1369         if (style->overflowX() == OSCROLL)
1370             style->setOverflowX(OHIDDEN);
1371         else if (style->overflowX() == OAUTO)
1372             style->setOverflowX(OVISIBLE);
1373
1374         // Only the root <svg> element in an SVG document fragment tree honors css position
1375         if (!(e->hasTagName(SVGNames::svgTag) && e->parentNode() && !e->parentNode()->isSVGElement()))
1376             style->setPosition(RenderStyle::initialPosition());
1377
1378         // RenderSVGRoot handles zooming for the whole SVG subtree, so foreignObject content should
1379         // not be scaled again.
1380         if (e->hasTagName(SVGNames::foreignObjectTag))
1381             style->setEffectiveZoom(RenderStyle::initialZoom());
1382     }
1383 #endif
1384 }
1385
1386 void StyleResolver::adjustGridItemPosition(RenderStyle* style, RenderStyle* parentStyle) const
1387 {
1388     const GridPosition& columnStartPosition = style->gridItemColumnStart();
1389     const GridPosition& columnEndPosition = style->gridItemColumnEnd();
1390     const GridPosition& rowStartPosition = style->gridItemRowStart();
1391     const GridPosition& rowEndPosition = style->gridItemRowEnd();
1392
1393     // If opposing grid-placement properties both specify a grid span, they both compute to ‘auto’.
1394     if (columnStartPosition.isSpan() && columnEndPosition.isSpan()) {
1395         style->setGridItemColumnStart(GridPosition());
1396         style->setGridItemColumnEnd(GridPosition());
1397     }
1398
1399     if (rowStartPosition.isSpan() && rowEndPosition.isSpan()) {
1400         style->setGridItemRowStart(GridPosition());
1401         style->setGridItemRowEnd(GridPosition());
1402     }
1403
1404     // Unknown named grid area compute to 'auto'.
1405     const NamedGridAreaMap& map = parentStyle->namedGridArea();
1406
1407 #define CLEAR_UNKNOWN_NAMED_AREA(prop, Prop) \
1408     if (prop.isNamedGridArea() && !map.contains(prop.namedGridLine())) \
1409         style->setGridItem##Prop(GridPosition());
1410
1411     CLEAR_UNKNOWN_NAMED_AREA(columnStartPosition, ColumnStart);
1412     CLEAR_UNKNOWN_NAMED_AREA(columnEndPosition, ColumnEnd);
1413     CLEAR_UNKNOWN_NAMED_AREA(rowStartPosition, RowStart);
1414     CLEAR_UNKNOWN_NAMED_AREA(rowEndPosition, RowEnd);
1415 }
1416
1417 bool StyleResolver::checkRegionStyle(Element* regionElement)
1418 {
1419     // FIXME (BUG 72472): We don't add @-webkit-region rules of scoped style sheets for the moment,
1420     // so all region rules are global by default. Verify whether that can stand or needs changing.
1421
1422     unsigned rulesSize = m_ruleSets.authorStyle()->regionSelectorsAndRuleSets().size();
1423     for (unsigned i = 0; i < rulesSize; ++i) {
1424         ASSERT(m_ruleSets.authorStyle()->regionSelectorsAndRuleSets().at(i).ruleSet.get());
1425         if (checkRegionSelector(m_ruleSets.authorStyle()->regionSelectorsAndRuleSets().at(i).selector, regionElement))
1426             return true;
1427     }
1428
1429     if (m_ruleSets.userStyle()) {
1430         rulesSize = m_ruleSets.userStyle()->regionSelectorsAndRuleSets().size();
1431         for (unsigned i = 0; i < rulesSize; ++i) {
1432             ASSERT(m_ruleSets.userStyle()->regionSelectorsAndRuleSets().at(i).ruleSet.get());
1433             if (checkRegionSelector(m_ruleSets.userStyle()->regionSelectorsAndRuleSets().at(i).selector, regionElement))
1434                 return true;
1435         }
1436     }
1437
1438     return false;
1439 }
1440
1441 static void checkForOrientationChange(RenderStyle* style)
1442 {
1443     FontOrientation fontOrientation;
1444     NonCJKGlyphOrientation glyphOrientation;
1445     style->getFontAndGlyphOrientation(fontOrientation, glyphOrientation);
1446
1447     const FontDescription& fontDescription = style->fontDescription();
1448     if (fontDescription.orientation() == fontOrientation && fontDescription.nonCJKGlyphOrientation() == glyphOrientation)
1449         return;
1450
1451     FontDescription newFontDescription(fontDescription);
1452     newFontDescription.setNonCJKGlyphOrientation(glyphOrientation);
1453     newFontDescription.setOrientation(fontOrientation);
1454     style->setFontDescription(newFontDescription);
1455 }
1456
1457 void StyleResolver::updateFont()
1458 {
1459     if (!m_state.fontDirty())
1460         return;
1461
1462     RenderStyle* style = m_state.style();
1463 #if ENABLE(IOS_TEXT_AUTOSIZING)
1464     checkForTextSizeAdjust(style);
1465 #endif
1466     checkForGenericFamilyChange(style, m_state.parentStyle());
1467     checkForZoomChange(style, m_state.parentStyle());
1468     checkForOrientationChange(style);
1469     style->font().update(m_fontSelector);
1470     m_state.setFontDirty(false);
1471 }
1472
1473 Vector<RefPtr<StyleRuleBase>> StyleResolver::styleRulesForElement(Element* e, unsigned rulesToInclude)
1474 {
1475     return pseudoStyleRulesForElement(e, NOPSEUDO, rulesToInclude);
1476 }
1477
1478 Vector<RefPtr<StyleRuleBase>> StyleResolver::pseudoStyleRulesForElement(Element* e, PseudoId pseudoId, unsigned rulesToInclude)
1479 {
1480     if (!e || !e->document().haveStylesheetsLoaded())
1481         return Vector<RefPtr<StyleRuleBase>>();
1482
1483     initElement(e);
1484     m_state.initForStyleResolve(document(), e, 0);
1485
1486     ElementRuleCollector collector(this, m_state);
1487     collector.setMode(SelectorChecker::CollectingRules);
1488     collector.setPseudoStyleRequest(PseudoStyleRequest(pseudoId));
1489     collector.setMedium(m_medium.get());
1490
1491     if (rulesToInclude & UAAndUserCSSRules) {
1492         // First we match rules from the user agent sheet.
1493         collector.matchUARules();
1494
1495         // Now we check user sheet rules.
1496         if (m_matchAuthorAndUserStyles)
1497             collector.matchUserRules(rulesToInclude & EmptyCSSRules);
1498     }
1499
1500     if (m_matchAuthorAndUserStyles && (rulesToInclude & AuthorCSSRules)) {
1501         collector.setSameOriginOnly(!(rulesToInclude & CrossOriginCSSRules));
1502
1503         // Check the rules in author sheets.
1504         collector.matchAuthorRules(rulesToInclude & EmptyCSSRules);
1505     }
1506
1507     return collector.matchedRuleList();
1508 }
1509
1510 // -------------------------------------------------------------------------------------
1511 // this is mostly boring stuff on how to apply a certain rule to the renderstyle...
1512
1513 Length StyleResolver::convertToIntLength(const CSSPrimitiveValue* primitiveValue, const RenderStyle* style, const RenderStyle* rootStyle, double multiplier)
1514 {
1515     return primitiveValue ? primitiveValue->convertToLength<FixedIntegerConversion | PercentConversion | CalculatedConversion | FractionConversion | ViewportPercentageConversion>(style, rootStyle, multiplier) : Length(Undefined);
1516 }
1517
1518 Length StyleResolver::convertToFloatLength(const CSSPrimitiveValue* primitiveValue, const RenderStyle* style, const RenderStyle* rootStyle, double multiplier)
1519 {
1520     return primitiveValue ? primitiveValue->convertToLength<FixedFloatConversion | PercentConversion | CalculatedConversion | FractionConversion | ViewportPercentageConversion>(style, rootStyle, multiplier) : Length(Undefined);
1521 }
1522
1523 template <StyleResolver::StyleApplicationPass pass>
1524 void StyleResolver::applyProperties(const StyleProperties* properties, StyleRule* rule, bool isImportant, bool inheritedOnly, PropertyWhitelistType propertyWhitelistType)
1525 {
1526     ASSERT((propertyWhitelistType != PropertyWhitelistRegion) || m_state.regionForStyling());
1527     InspectorInstrumentationCookie cookie = InspectorInstrumentation::willProcessRule(&document(), rule, *this);
1528
1529     unsigned propertyCount = properties->propertyCount();
1530     for (unsigned i = 0; i < propertyCount; ++i) {
1531         StyleProperties::PropertyReference current = properties->propertyAt(i);
1532         if (isImportant != current.isImportant())
1533             continue;
1534         if (inheritedOnly && !current.isInherited()) {
1535             // If the property value is explicitly inherited, we need to apply further non-inherited properties
1536             // as they might override the value inherited here. For this reason we don't allow declarations with
1537             // explicitly inherited properties to be cached.
1538             ASSERT(!current.value()->isInheritedValue());
1539             continue;
1540         }
1541         CSSPropertyID property = current.id();
1542
1543         if (propertyWhitelistType == PropertyWhitelistRegion && !StyleResolver::isValidRegionStyleProperty(property))
1544             continue;
1545 #if ENABLE(VIDEO_TRACK)
1546         if (propertyWhitelistType == PropertyWhitelistCue && !StyleResolver::isValidCueStyleProperty(property))
1547             continue;
1548 #endif
1549         switch (pass) {
1550         case HighPriorityProperties:
1551             COMPILE_ASSERT(firstCSSProperty == CSSPropertyColor, CSS_color_is_first_property);
1552 #if ENABLE(IOS_TEXT_AUTOSIZING)
1553             COMPILE_ASSERT(CSSPropertyZoom == CSSPropertyColor + 18, CSS_zoom_is_end_of_first_prop_range);
1554 #else
1555             COMPILE_ASSERT(CSSPropertyZoom == CSSPropertyColor + 17, CSS_zoom_is_end_of_first_prop_range);
1556 #endif
1557             COMPILE_ASSERT(CSSPropertyLineHeight == CSSPropertyZoom + 1, CSS_line_height_is_after_zoom);
1558             // give special priority to font-xxx, color properties, etc
1559             if (property < CSSPropertyLineHeight)
1560                 applyProperty(current.id(), current.value());
1561             // we apply line-height later
1562             else if (property == CSSPropertyLineHeight)
1563                 m_state.setLineHeightValue(current.value());
1564             break;
1565         case LowPriorityProperties:
1566             if (property > CSSPropertyLineHeight)
1567                 applyProperty(current.id(), current.value());
1568         }
1569     }
1570     InspectorInstrumentation::didProcessRule(cookie);
1571 }
1572
1573 template <StyleResolver::StyleApplicationPass pass>
1574 void StyleResolver::applyMatchedProperties(const MatchResult& matchResult, bool isImportant, int startIndex, int endIndex, bool inheritedOnly)
1575 {
1576     if (startIndex == -1)
1577         return;
1578
1579     State& state = m_state;
1580     if (state.style()->insideLink() != NotInsideLink) {
1581         for (int i = startIndex; i <= endIndex; ++i) {
1582             const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
1583             unsigned linkMatchType = matchedProperties.linkMatchType;
1584             // FIXME: It would be nicer to pass these as arguments but that requires changes in many places.
1585             state.setApplyPropertyToRegularStyle(linkMatchType & SelectorChecker::MatchLink);
1586             state.setApplyPropertyToVisitedLinkStyle(linkMatchType & SelectorChecker::MatchVisited);
1587
1588             applyProperties<pass>(matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
1589         }
1590         state.setApplyPropertyToRegularStyle(true);
1591         state.setApplyPropertyToVisitedLinkStyle(false);
1592         return;
1593     }
1594     for (int i = startIndex; i <= endIndex; ++i) {
1595         const MatchedProperties& matchedProperties = matchResult.matchedProperties[i];
1596         applyProperties<pass>(matchedProperties.properties.get(), matchResult.matchedRules[i], isImportant, inheritedOnly, static_cast<PropertyWhitelistType>(matchedProperties.whitelistType));
1597     }
1598 }
1599
1600 unsigned StyleResolver::computeMatchedPropertiesHash(const MatchedProperties* properties, unsigned size)
1601 {
1602
1603     return StringHasher::hashMemory(properties, sizeof(MatchedProperties) * size);
1604 }
1605
1606 bool operator==(const StyleResolver::MatchRanges& a, const StyleResolver::MatchRanges& b)
1607 {
1608     return a.firstUARule == b.firstUARule
1609         && a.lastUARule == b.lastUARule
1610         && a.firstAuthorRule == b.firstAuthorRule
1611         && a.lastAuthorRule == b.lastAuthorRule
1612         && a.firstUserRule == b.firstUserRule
1613         && a.lastUserRule == b.lastUserRule;
1614 }
1615
1616 bool operator!=(const StyleResolver::MatchRanges& a, const StyleResolver::MatchRanges& b)
1617 {
1618     return !(a == b);
1619 }
1620
1621 bool operator==(const StyleResolver::MatchedProperties& a, const StyleResolver::MatchedProperties& b)
1622 {
1623     return a.properties == b.properties && a.linkMatchType == b.linkMatchType;
1624 }
1625
1626 bool operator!=(const StyleResolver::MatchedProperties& a, const StyleResolver::MatchedProperties& b)
1627 {
1628     return !(a == b);
1629 }
1630
1631 const StyleResolver::MatchedPropertiesCacheItem* StyleResolver::findFromMatchedPropertiesCache(unsigned hash, const MatchResult& matchResult)
1632 {
1633     ASSERT(hash);
1634
1635     MatchedPropertiesCache::iterator it = m_matchedPropertiesCache.find(hash);
1636     if (it == m_matchedPropertiesCache.end())
1637         return 0;
1638     MatchedPropertiesCacheItem& cacheItem = it->value;
1639
1640     size_t size = matchResult.matchedProperties.size();
1641     if (size != cacheItem.matchedProperties.size())
1642         return 0;
1643     for (size_t i = 0; i < size; ++i) {
1644         if (matchResult.matchedProperties[i] != cacheItem.matchedProperties[i])
1645             return 0;
1646     }
1647     if (cacheItem.ranges != matchResult.ranges)
1648         return 0;
1649     return &cacheItem;
1650 }
1651
1652 void StyleResolver::addToMatchedPropertiesCache(const RenderStyle* style, const RenderStyle* parentStyle, unsigned hash, const MatchResult& matchResult)
1653 {
1654     static const unsigned matchedDeclarationCacheAdditionsBetweenSweeps = 100;
1655     if (++m_matchedPropertiesCacheAdditionsSinceLastSweep >= matchedDeclarationCacheAdditionsBetweenSweeps
1656         && !m_matchedPropertiesCacheSweepTimer.isActive()) {
1657         static const unsigned matchedDeclarationCacheSweepTimeInSeconds = 60;
1658         m_matchedPropertiesCacheSweepTimer.startOneShot(matchedDeclarationCacheSweepTimeInSeconds);
1659     }
1660
1661     ASSERT(hash);
1662     MatchedPropertiesCacheItem cacheItem;
1663     cacheItem.matchedProperties.appendVector(matchResult.matchedProperties);
1664     cacheItem.ranges = matchResult.ranges;
1665     // Note that we don't cache the original RenderStyle instance. It may be further modified.
1666     // The RenderStyle in the cache is really just a holder for the substructures and never used as-is.
1667     cacheItem.renderStyle = RenderStyle::clone(style);
1668     cacheItem.parentRenderStyle = RenderStyle::clone(parentStyle);
1669     m_matchedPropertiesCache.add(hash, cacheItem);
1670 }
1671
1672 void StyleResolver::invalidateMatchedPropertiesCache()
1673 {
1674     m_matchedPropertiesCache.clear();
1675 }
1676
1677 static bool isCacheableInMatchedPropertiesCache(const Element* element, const RenderStyle* style, const RenderStyle* parentStyle)
1678 {
1679     // FIXME: CSSPropertyWebkitWritingMode modifies state when applying to document element. We can't skip the applying by caching.
1680     if (element == element->document().documentElement() && element->document().writingModeSetOnDocumentElement())
1681         return false;
1682     if (style->unique() || (style->styleType() != NOPSEUDO && parentStyle->unique()))
1683         return false;
1684     if (style->hasAppearance())
1685         return false;
1686     if (style->zoom() != RenderStyle::initialZoom())
1687         return false;
1688     if (style->writingMode() != RenderStyle::initialWritingMode())
1689         return false;
1690     // The cache assumes static knowledge about which properties are inherited.
1691     if (parentStyle->hasExplicitlyInheritedProperties())
1692         return false;
1693     return true;
1694 }
1695
1696 void StyleResolver::applyMatchedProperties(const MatchResult& matchResult, const Element* element)
1697 {
1698     ASSERT(element);
1699     State& state = m_state;
1700     unsigned cacheHash = matchResult.isCacheable ? computeMatchedPropertiesHash(matchResult.matchedProperties.data(), matchResult.matchedProperties.size()) : 0;
1701     bool applyInheritedOnly = false;
1702     const MatchedPropertiesCacheItem* cacheItem = 0;
1703     if (cacheHash && (cacheItem = findFromMatchedPropertiesCache(cacheHash, matchResult))) {
1704         // We can build up the style by copying non-inherited properties from an earlier style object built using the same exact
1705         // style declarations. We then only need to apply the inherited properties, if any, as their values can depend on the
1706         // element context. This is fast and saves memory by reusing the style data structures.
1707         state.style()->copyNonInheritedFrom(cacheItem->renderStyle.get());
1708         if (state.parentStyle()->inheritedDataShared(cacheItem->parentRenderStyle.get()) && !isAtShadowBoundary(element)) {
1709             EInsideLink linkStatus = state.style()->insideLink();
1710             // If the cache item parent style has identical inherited properties to the current parent style then the
1711             // resulting style will be identical too. We copy the inherited properties over from the cache and are done.
1712             state.style()->inheritFrom(cacheItem->renderStyle.get());
1713
1714             // Unfortunately the link status is treated like an inherited property. We need to explicitly restore it.
1715             state.style()->setInsideLink(linkStatus);
1716             return;
1717         }
1718         applyInheritedOnly = true;
1719     }
1720
1721     // Now we have all of the matched rules in the appropriate order. Walk the rules and apply
1722     // high-priority properties first, i.e., those properties that other properties depend on.
1723     // The order is (1) high-priority not important, (2) high-priority important, (3) normal not important
1724     // and (4) normal important.
1725     state.setLineHeightValue(0);
1726     applyMatchedProperties<HighPriorityProperties>(matchResult, false, 0, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
1727     applyMatchedProperties<HighPriorityProperties>(matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
1728     applyMatchedProperties<HighPriorityProperties>(matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
1729     applyMatchedProperties<HighPriorityProperties>(matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
1730
1731     if (cacheItem && cacheItem->renderStyle->effectiveZoom() != state.style()->effectiveZoom()) {
1732         state.setFontDirty(true);
1733         applyInheritedOnly = false;
1734     }
1735
1736     // If our font got dirtied, go ahead and update it now.
1737     updateFont();
1738
1739     // Line-height is set when we are sure we decided on the font-size.
1740     if (state.lineHeightValue())
1741         applyProperty(CSSPropertyLineHeight, state.lineHeightValue());
1742
1743     // Many properties depend on the font. If it changes we just apply all properties.
1744     if (cacheItem && cacheItem->renderStyle->fontDescription() != state.style()->fontDescription())
1745         applyInheritedOnly = false;
1746
1747     // Now do the normal priority UA properties.
1748     applyMatchedProperties<LowPriorityProperties>(matchResult, false, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
1749
1750     // Cache our border and background so that we can examine them later.
1751     state.cacheBorderAndBackground();
1752
1753     // Now do the author and user normal priority properties and all the !important properties.
1754     applyMatchedProperties<LowPriorityProperties>(matchResult, false, matchResult.ranges.lastUARule + 1, matchResult.matchedProperties.size() - 1, applyInheritedOnly);
1755     applyMatchedProperties<LowPriorityProperties>(matchResult, true, matchResult.ranges.firstAuthorRule, matchResult.ranges.lastAuthorRule, applyInheritedOnly);
1756     applyMatchedProperties<LowPriorityProperties>(matchResult, true, matchResult.ranges.firstUserRule, matchResult.ranges.lastUserRule, applyInheritedOnly);
1757     applyMatchedProperties<LowPriorityProperties>(matchResult, true, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, applyInheritedOnly);
1758
1759     // Start loading resources referenced by this style.
1760     loadPendingResources();
1761
1762     ASSERT(!state.fontDirty());
1763
1764     if (cacheItem || !cacheHash)
1765         return;
1766     if (!isCacheableInMatchedPropertiesCache(state.element(), state.style(), state.parentStyle()))
1767         return;
1768     addToMatchedPropertiesCache(state.style(), state.parentStyle(), cacheHash, matchResult);
1769 }
1770
1771 void StyleResolver::applyPropertyToStyle(CSSPropertyID id, CSSValue* value, RenderStyle* style)
1772 {
1773     initElement(0);
1774     m_state.initForStyleResolve(document(), 0, style);
1775     m_state.setStyle(*style);
1776     applyPropertyToCurrentStyle(id, value);
1777 }
1778
1779 void StyleResolver::applyPropertyToCurrentStyle(CSSPropertyID id, CSSValue* value)
1780 {
1781     if (value)
1782         applyProperty(id, value);
1783 }
1784
1785 inline bool isValidVisitedLinkProperty(CSSPropertyID id)
1786 {
1787     switch (id) {
1788     case CSSPropertyBackgroundColor:
1789     case CSSPropertyBorderLeftColor:
1790     case CSSPropertyBorderRightColor:
1791     case CSSPropertyBorderTopColor:
1792     case CSSPropertyBorderBottomColor:
1793     case CSSPropertyColor:
1794     case CSSPropertyOutlineColor:
1795     case CSSPropertyWebkitColumnRuleColor:
1796 #if ENABLE(CSS3_TEXT_DECORATION)
1797     case CSSPropertyWebkitTextDecorationColor:
1798 #endif
1799     case CSSPropertyWebkitTextEmphasisColor:
1800     case CSSPropertyWebkitTextFillColor:
1801     case CSSPropertyWebkitTextStrokeColor:
1802 #if ENABLE(SVG)
1803     case CSSPropertyFill:
1804     case CSSPropertyStroke:
1805 #endif
1806         return true;
1807     default:
1808         break;
1809     }
1810
1811     return false;
1812 }
1813
1814 // http://dev.w3.org/csswg/css3-regions/#the-at-region-style-rule
1815 // FIXME: add incremental support for other region styling properties.
1816 inline bool StyleResolver::isValidRegionStyleProperty(CSSPropertyID id)
1817 {
1818     switch (id) {
1819     case CSSPropertyBackgroundColor:
1820     case CSSPropertyColor:
1821         return true;
1822     default:
1823         break;
1824     }
1825
1826     return false;
1827 }
1828
1829 #if ENABLE(VIDEO_TRACK)
1830 inline bool StyleResolver::isValidCueStyleProperty(CSSPropertyID id)
1831 {
1832     switch (id) {
1833     case CSSPropertyBackground:
1834     case CSSPropertyBackgroundAttachment:
1835     case CSSPropertyBackgroundClip:
1836     case CSSPropertyBackgroundColor:
1837     case CSSPropertyBackgroundImage:
1838     case CSSPropertyBackgroundOrigin:
1839     case CSSPropertyBackgroundPosition:
1840     case CSSPropertyBackgroundPositionX:
1841     case CSSPropertyBackgroundPositionY:
1842     case CSSPropertyBackgroundRepeat:
1843     case CSSPropertyBackgroundRepeatX:
1844     case CSSPropertyBackgroundRepeatY:
1845     case CSSPropertyBackgroundSize:
1846     case CSSPropertyColor:
1847     case CSSPropertyFont:
1848     case CSSPropertyFontFamily:
1849     case CSSPropertyFontSize:
1850     case CSSPropertyFontStyle:
1851     case CSSPropertyFontVariant:
1852     case CSSPropertyFontWeight:
1853     case CSSPropertyLineHeight:
1854     case CSSPropertyOpacity:
1855     case CSSPropertyOutline:
1856     case CSSPropertyOutlineColor:
1857     case CSSPropertyOutlineOffset:
1858     case CSSPropertyOutlineStyle:
1859     case CSSPropertyOutlineWidth:
1860     case CSSPropertyVisibility:
1861     case CSSPropertyWhiteSpace:
1862     case CSSPropertyTextDecoration:
1863     case CSSPropertyTextShadow:
1864     case CSSPropertyBorderStyle:
1865         return true;
1866     default:
1867         break;
1868     }
1869     return false;
1870 }
1871 #endif
1872 // SVG handles zooming in a different way compared to CSS. The whole document is scaled instead
1873 // of each individual length value in the render style / tree. CSSPrimitiveValue::computeLength*()
1874 // multiplies each resolved length with the zoom multiplier - so for SVG we need to disable that.
1875 // Though all CSS values that can be applied to outermost <svg> elements (width/height/border/padding...)
1876 // need to respect the scaling. RenderBox (the parent class of RenderSVGRoot) grabs values like
1877 // width/height/border/padding/... from the RenderStyle -> for SVG these values would never scale,
1878 // if we'd pass a 1.0 zoom factor everyhwere. So we only pass a zoom factor of 1.0 for specific
1879 // properties that are NOT allowed to scale within a zoomed SVG document (letter/word-spacing/font-size).
1880 bool StyleResolver::useSVGZoomRules()
1881 {
1882     return m_state.element() && m_state.element()->isSVGElement();
1883 }
1884
1885 static bool createGridTrackBreadth(CSSPrimitiveValue* primitiveValue, const StyleResolver::State& state, GridLength& workingLength)
1886 {
1887     if (primitiveValue->getValueID() == CSSValueWebkitMinContent) {
1888         workingLength = Length(MinContent);
1889         return true;
1890     }
1891
1892     if (primitiveValue->getValueID() == CSSValueWebkitMaxContent) {
1893         workingLength = Length(MaxContent);
1894         return true;
1895     }
1896
1897     if (primitiveValue->isFlex()) {
1898         // Fractional unit.
1899         workingLength.setFlex(primitiveValue->getDoubleValue());
1900         return true;
1901     }
1902
1903     workingLength = primitiveValue->convertToLength<FixedIntegerConversion | PercentConversion | ViewportPercentageConversion | AutoConversion>(state.style(), state.rootElementStyle(), state.style()->effectiveZoom());
1904     if (workingLength.length().isUndefined())
1905         return false;
1906
1907     if (primitiveValue->isLength())
1908         workingLength.length().setQuirk(primitiveValue->isQuirkValue());
1909
1910     return true;
1911 }
1912
1913 static bool createGridTrackSize(CSSValue* value, GridTrackSize& trackSize, const StyleResolver::State& state)
1914 {
1915     if (!value->isPrimitiveValue())
1916         return false;
1917
1918     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
1919     Pair* minMaxTrackBreadth = primitiveValue->getPairValue();
1920     if (!minMaxTrackBreadth) {
1921         GridLength workingLength;
1922         if (!createGridTrackBreadth(primitiveValue, state, workingLength))
1923             return false;
1924
1925         trackSize.setLength(workingLength);
1926         return true;
1927     }
1928
1929     GridLength minTrackBreadth;
1930     GridLength maxTrackBreadth;
1931     if (!createGridTrackBreadth(minMaxTrackBreadth->first(), state, minTrackBreadth) || !createGridTrackBreadth(minMaxTrackBreadth->second(), state, maxTrackBreadth))
1932         return false;
1933
1934     trackSize.setMinMax(minTrackBreadth, maxTrackBreadth);
1935     return true;
1936 }
1937
1938 static bool createGridTrackList(CSSValue* value, Vector<GridTrackSize>& trackSizes, NamedGridLinesMap& namedGridLines, const StyleResolver::State& state)
1939 {
1940     // Handle 'none'.
1941     if (value->isPrimitiveValue()) {
1942         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
1943         return primitiveValue->getValueID() == CSSValueNone;
1944     }
1945
1946     if (!value->isValueList())
1947         return false;
1948
1949     size_t currentNamedGridLine = 0;
1950     for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
1951         CSSValue* currValue = i.value();
1952         if (currValue->isPrimitiveValue()) {
1953             CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(currValue);
1954             if (primitiveValue->isString()) {
1955                 NamedGridLinesMap::AddResult result = namedGridLines.add(primitiveValue->getStringValue(), Vector<size_t>());
1956                 result.iterator->value.append(currentNamedGridLine);
1957                 continue;
1958             }
1959         }
1960
1961         ++currentNamedGridLine;
1962         GridTrackSize trackSize;
1963         if (!createGridTrackSize(currValue, trackSize, state))
1964             return false;
1965
1966         trackSizes.append(trackSize);
1967     }
1968
1969     // The parser should have rejected any <track-list> without any <track-size> as
1970     // this is not conformant to the syntax.
1971     ASSERT(!trackSizes.isEmpty());
1972     return true;
1973 }
1974
1975
1976 static bool createGridPosition(CSSValue* value, GridPosition& position)
1977 {
1978     // We accept the specification's grammar:
1979     // 'auto' | [ <integer> || <string> ] | [ span && [ <integer> || string ] ] | <ident>
1980     if (value->isPrimitiveValue()) {
1981         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
1982         // We translate <ident> to <string> during parsing as it makes handling it simpler.
1983         if (primitiveValue->isString()) {
1984             position.setNamedGridArea(primitiveValue->getStringValue());
1985             return true;
1986         }
1987
1988         ASSERT(primitiveValue->getValueID() == CSSValueAuto);
1989         return true;
1990     }
1991
1992     CSSValueList* values = toCSSValueList(value);
1993     ASSERT(values->length());
1994
1995     bool isSpanPosition = false;
1996     // The specification makes the <integer> optional, in which case it default to '1'.
1997     int gridLineNumber = 1;
1998     String gridLineName;
1999
2000     CSSValueListIterator it = values;
2001     CSSPrimitiveValue* currentValue = toCSSPrimitiveValue(it.value());
2002     if (currentValue->getValueID() == CSSValueSpan) {
2003         isSpanPosition = true;
2004         it.advance();
2005         currentValue = it.hasMore() ? toCSSPrimitiveValue(it.value()) : 0;
2006     }
2007
2008     if (currentValue && currentValue->isNumber()) {
2009         gridLineNumber = currentValue->getIntValue();
2010         it.advance();
2011         currentValue = it.hasMore() ? toCSSPrimitiveValue(it.value()) : 0;
2012     }
2013
2014     if (currentValue && currentValue->isString()) {
2015         gridLineName = currentValue->getStringValue();
2016         it.advance();
2017     }
2018
2019     ASSERT(!it.hasMore());
2020     if (isSpanPosition)
2021         position.setSpanPosition(gridLineNumber, gridLineName);
2022     else
2023         position.setExplicitPosition(gridLineNumber, gridLineName);
2024
2025     return true;
2026 }
2027
2028 void StyleResolver::applyProperty(CSSPropertyID id, CSSValue* value)
2029 {
2030     ASSERT_WITH_MESSAGE(!isExpandedShorthand(id), "Shorthand property id = %d wasn't expanded at parsing time", id);
2031
2032     State& state = m_state;
2033
2034     if (CSSProperty::isDirectionAwareProperty(id)) {
2035         CSSPropertyID newId = CSSProperty::resolveDirectionAwareProperty(id, state.style()->direction(), state.style()->writingMode());
2036         ASSERT(newId != id);
2037         return applyProperty(newId, value);
2038     }
2039
2040     bool isInherit = state.parentNode() && value->isInheritedValue();
2041     bool isInitial = value->isInitialValue() || (!state.parentNode() && value->isInheritedValue());
2042
2043     ASSERT(!isInherit || !isInitial); // isInherit -> !isInitial && isInitial -> !isInherit
2044     ASSERT(!isInherit || (state.parentNode() && state.parentStyle())); // isInherit -> (state.parentNode() && state.parentStyle())
2045
2046     if (!state.applyPropertyToRegularStyle() && (!state.applyPropertyToVisitedLinkStyle() || !isValidVisitedLinkProperty(id))) {
2047         // Limit the properties that can be applied to only the ones honored by :visited.
2048         return;
2049     }
2050
2051     if (isInherit && !state.parentStyle()->hasExplicitlyInheritedProperties() && !CSSProperty::isInheritedProperty(id))
2052         state.parentStyle()->setHasExplicitlyInheritedProperties();
2053
2054     // Check lookup table for implementations and use when available.
2055     const PropertyHandler& handler = m_deprecatedStyleBuilder.propertyHandler(id);
2056     if (handler.isValid()) {
2057         if (isInherit)
2058             handler.applyInheritValue(id, this);
2059         else if (isInitial)
2060             handler.applyInitialValue(id, this);
2061         else
2062             handler.applyValue(id, this, value);
2063         return;
2064     }
2065
2066     CSSPrimitiveValue* primitiveValue = value->isPrimitiveValue() ? toCSSPrimitiveValue(value) : 0;
2067
2068     float zoomFactor = state.style()->effectiveZoom();
2069
2070     // What follows is a list that maps the CSS properties into their corresponding front-end
2071     // RenderStyle values.
2072     switch (id) {
2073     // lists
2074     case CSSPropertyContent:
2075         // list of string, uri, counter, attr, i
2076         {
2077             // FIXME: In CSS3, it will be possible to inherit content. In CSS2 it is not. This
2078             // note is a reminder that eventually "inherit" needs to be supported.
2079
2080             if (isInitial) {
2081                 state.style()->clearContent();
2082                 return;
2083             }
2084
2085             if (!value->isValueList())
2086                 return;
2087
2088             bool didSet = false;
2089             for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
2090                 CSSValue* item = i.value();
2091                 if (item->isImageGeneratorValue()) {
2092                     if (item->isGradientValue())
2093                         state.style()->setContent(StyleGeneratedImage::create(toCSSGradientValue(item)->gradientWithStylesResolved(this).get()), didSet);
2094                     else
2095                         state.style()->setContent(StyleGeneratedImage::create(static_cast<CSSImageGeneratorValue*>(item)), didSet);
2096                     didSet = true;
2097 #if ENABLE(CSS_IMAGE_SET)
2098                 } else if (item->isImageSetValue()) {
2099                     state.style()->setContent(setOrPendingFromValue(CSSPropertyContent, toCSSImageSetValue(item)), didSet);
2100                     didSet = true;
2101 #endif
2102                 }
2103
2104                 if (item->isImageValue()) {
2105                     state.style()->setContent(cachedOrPendingFromValue(CSSPropertyContent, toCSSImageValue(item)), didSet);
2106                     didSet = true;
2107                     continue;
2108                 }
2109
2110                 if (!item->isPrimitiveValue())
2111                     continue;
2112
2113                 CSSPrimitiveValue* contentValue = toCSSPrimitiveValue(item);
2114
2115                 if (contentValue->isString()) {
2116                     state.style()->setContent(contentValue->getStringValue().impl(), didSet);
2117                     didSet = true;
2118                 } else if (contentValue->isAttr()) {
2119                     // FIXME: Can a namespace be specified for an attr(foo)?
2120                     if (state.style()->styleType() == NOPSEUDO)
2121                         state.style()->setUnique();
2122                     else
2123                         state.parentStyle()->setUnique();
2124                     QualifiedName attr(nullAtom, contentValue->getStringValue().impl(), nullAtom);
2125                     const AtomicString& value = state.element()->getAttribute(attr);
2126                     state.style()->setContent(value.isNull() ? emptyAtom : value.impl(), didSet);
2127                     didSet = true;
2128                     // Register the fact that the attribute value affects the style.
2129                     m_ruleSets.features().attrsInRules.add(attr.localName().impl());
2130                 } else if (contentValue->isCounter()) {
2131                     Counter* counterValue = contentValue->getCounterValue();
2132                     EListStyleType listStyleType = NoneListStyle;
2133                     CSSValueID listStyleIdent = counterValue->listStyleIdent();
2134                     if (listStyleIdent != CSSValueNone)
2135                         listStyleType = static_cast<EListStyleType>(listStyleIdent - CSSValueDisc);
2136                     auto counter = std::make_unique<CounterContent>(counterValue->identifier(), listStyleType, counterValue->separator());
2137                     state.style()->setContent(std::move(counter), didSet);
2138                     didSet = true;
2139                 } else {
2140                     switch (contentValue->getValueID()) {
2141                     case CSSValueOpenQuote:
2142                         state.style()->setContent(OPEN_QUOTE, didSet);
2143                         didSet = true;
2144                         break;
2145                     case CSSValueCloseQuote:
2146                         state.style()->setContent(CLOSE_QUOTE, didSet);
2147                         didSet = true;
2148                         break;
2149                     case CSSValueNoOpenQuote:
2150                         state.style()->setContent(NO_OPEN_QUOTE, didSet);
2151                         didSet = true;
2152                         break;
2153                     case CSSValueNoCloseQuote:
2154                         state.style()->setContent(NO_CLOSE_QUOTE, didSet);
2155                         didSet = true;
2156                         break;
2157                     default:
2158                         // normal and none do not have any effect.
2159                         { }
2160                     }
2161                 }
2162             }
2163             if (!didSet)
2164                 state.style()->clearContent();
2165             return;
2166         }
2167     case CSSPropertyWebkitAlt:
2168         {
2169             bool didSet = false;
2170             if (primitiveValue->isString()) {
2171                 state.style()->setContentAltText(primitiveValue->getStringValue().impl());
2172                 didSet = true;
2173             } else if (primitiveValue->isAttr()) {
2174                 // FIXME: Can a namespace be specified for an attr(foo)?
2175                 if (state.style()->styleType() == NOPSEUDO)
2176                     state.style()->setUnique();
2177                 else
2178                     state.parentStyle()->setUnique();
2179                 QualifiedName attr(nullAtom, primitiveValue->getStringValue().impl(), nullAtom);
2180                 const AtomicString& value = state.element()->getAttribute(attr);
2181                 state.style()->setContentAltText(value.isNull() ? emptyAtom : value.impl());
2182                 didSet = true;
2183                 // Register the fact that the attribute value affects the style.
2184                 m_ruleSets.features().attrsInRules.add(attr.localName().impl());
2185             }
2186             if (!didSet)
2187                 state.style()->setContentAltText(emptyAtom);
2188         }
2189     case CSSPropertyQuotes:
2190         if (isInherit) {
2191             state.style()->setQuotes(state.parentStyle()->quotes());
2192             return;
2193         }
2194         if (isInitial) {
2195             state.style()->setQuotes(0);
2196             return;
2197         }
2198         if (value->isValueList()) {
2199             CSSValueList* list = toCSSValueList(value);
2200             Vector<std::pair<String, String>> quotes;
2201             for (size_t i = 0; i < list->length(); i += 2) {
2202                 CSSValue* first = list->itemWithoutBoundsCheck(i);
2203                 // item() returns null if out of bounds so this is safe.
2204                 CSSValue* second = list->item(i + 1);
2205                 if (!second)
2206                     continue;
2207                 ASSERT_WITH_SECURITY_IMPLICATION(first->isPrimitiveValue());
2208                 ASSERT_WITH_SECURITY_IMPLICATION(second->isPrimitiveValue());
2209                 String startQuote = toCSSPrimitiveValue(first)->getStringValue();
2210                 String endQuote = toCSSPrimitiveValue(second)->getStringValue();
2211                 quotes.append(std::make_pair(startQuote, endQuote));
2212             }
2213             state.style()->setQuotes(QuotesData::create(quotes));
2214             return;
2215         }
2216         if (primitiveValue) {
2217             if (primitiveValue->getValueID() == CSSValueNone)
2218                 state.style()->setQuotes(QuotesData::create(Vector<std::pair<String, String>>()));
2219         }
2220         return;
2221     // Shorthand properties.
2222     case CSSPropertyFont:
2223         if (isInherit) {
2224             FontDescription fontDescription = state.parentStyle()->fontDescription();
2225             state.style()->setLineHeight(state.parentStyle()->specifiedLineHeight());
2226             state.setLineHeightValue(0);
2227             setFontDescription(fontDescription);
2228         } else if (isInitial) {
2229             Settings* settings = documentSettings();
2230             ASSERT(settings); // If we're doing style resolution, this document should always be in a frame and thus have settings
2231             if (!settings)
2232                 return;
2233             initializeFontStyle(settings);
2234         } else if (primitiveValue) {
2235             state.style()->setLineHeight(RenderStyle::initialLineHeight());
2236             state.setLineHeightValue(0);
2237
2238             FontDescription fontDescription;
2239             RenderTheme::defaultTheme()->systemFont(primitiveValue->getValueID(), fontDescription);
2240
2241             // Double-check and see if the theme did anything. If not, don't bother updating the font.
2242             if (fontDescription.isAbsoluteSize()) {
2243                 // Make sure the rendering mode and printer font settings are updated.
2244                 Settings* settings = documentSettings();
2245                 ASSERT(settings); // If we're doing style resolution, this document should always be in a frame and thus have settings
2246                 if (!settings)
2247                     return;
2248                 fontDescription.setRenderingMode(settings->fontRenderingMode());
2249                 fontDescription.setUsePrinterFont(document().printing() || !settings->screenFontSubstitutionEnabled());
2250
2251                 // Handle the zoom factor.
2252                 fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSize(fontDescription.specifiedSize(), fontDescription.isAbsoluteSize(), useSVGZoomRules(), state.style(), document()));
2253                 setFontDescription(fontDescription);
2254             }
2255         } else if (value->isFontValue()) {
2256             CSSFontValue* font = toCSSFontValue(value);
2257             if (!font->style || !font->variant || !font->weight
2258                 || !font->size || !font->lineHeight || !font->family)
2259                 return;
2260             applyProperty(CSSPropertyFontStyle, font->style.get());
2261             applyProperty(CSSPropertyFontVariant, font->variant.get());
2262             applyProperty(CSSPropertyFontWeight, font->weight.get());
2263             // The previous properties can dirty our font but they don't try to read the font's
2264             // properties back, which is safe. However if font-size is using the 'ex' unit, it will
2265             // need query the dirtied font's x-height to get the computed size. To be safe in this
2266             // case, let's just update the font now.
2267             updateFont();
2268             applyProperty(CSSPropertyFontSize, font->size.get());
2269
2270             state.setLineHeightValue(font->lineHeight.get());
2271
2272             applyProperty(CSSPropertyFontFamily, font->family.get());
2273         }
2274         return;
2275
2276     case CSSPropertyBackground:
2277     case CSSPropertyBackgroundPosition:
2278     case CSSPropertyBackgroundRepeat:
2279     case CSSPropertyBorder:
2280     case CSSPropertyBorderBottom:
2281     case CSSPropertyBorderColor:
2282     case CSSPropertyBorderImage:
2283     case CSSPropertyBorderLeft:
2284     case CSSPropertyBorderRadius:
2285     case CSSPropertyBorderRight:
2286     case CSSPropertyBorderSpacing:
2287     case CSSPropertyBorderStyle:
2288     case CSSPropertyBorderTop:
2289     case CSSPropertyBorderWidth:
2290     case CSSPropertyListStyle:
2291     case CSSPropertyMargin:
2292     case CSSPropertyOutline:
2293     case CSSPropertyOverflow:
2294     case CSSPropertyPadding:
2295     case CSSPropertyTransition:
2296     case CSSPropertyWebkitAnimation:
2297     case CSSPropertyWebkitBorderAfter:
2298     case CSSPropertyWebkitBorderBefore:
2299     case CSSPropertyWebkitBorderEnd:
2300     case CSSPropertyWebkitBorderStart:
2301     case CSSPropertyWebkitBorderRadius:
2302     case CSSPropertyWebkitColumns:
2303     case CSSPropertyWebkitColumnRule:
2304     case CSSPropertyWebkitFlex:
2305     case CSSPropertyWebkitFlexFlow:
2306     case CSSPropertyWebkitGridArea:
2307     case CSSPropertyWebkitGridColumn:
2308     case CSSPropertyWebkitGridRow:
2309     case CSSPropertyWebkitMarginCollapse:
2310     case CSSPropertyWebkitMarquee:
2311     case CSSPropertyWebkitMask:
2312     case CSSPropertyWebkitMaskPosition:
2313     case CSSPropertyWebkitMaskRepeat:
2314     case CSSPropertyWebkitTextEmphasis:
2315     case CSSPropertyWebkitTextStroke:
2316     case CSSPropertyWebkitTransition:
2317     case CSSPropertyWebkitTransformOrigin:
2318         ASSERT(isExpandedShorthand(id));
2319         ASSERT_NOT_REACHED();
2320         break;
2321
2322     // CSS3 Properties
2323     case CSSPropertyTextShadow:
2324     case CSSPropertyBoxShadow:
2325     case CSSPropertyWebkitBoxShadow: {
2326         if (isInherit) {
2327             if (id == CSSPropertyTextShadow)
2328                 return state.style()->setTextShadow(state.parentStyle()->textShadow() ? adoptPtr(new ShadowData(*state.parentStyle()->textShadow())) : nullptr);
2329             return state.style()->setBoxShadow(state.parentStyle()->boxShadow() ? adoptPtr(new ShadowData(*state.parentStyle()->boxShadow())) : nullptr);
2330         }
2331         if (isInitial || primitiveValue) // initial | none
2332             return id == CSSPropertyTextShadow ? state.style()->setTextShadow(nullptr) : state.style()->setBoxShadow(nullptr);
2333
2334         if (!value->isValueList())
2335             return;
2336
2337         for (CSSValueListIterator i = value; i.hasMore(); i.advance()) {
2338             CSSValue* currValue = i.value();
2339             if (!currValue->isShadowValue())
2340                 continue;
2341             CSSShadowValue* item = toCSSShadowValue(currValue);
2342             int x = item->x->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor);
2343             if (item->x->isViewportPercentageLength())
2344                 x = viewportPercentageValue(*item->x, x);
2345             int y = item->y->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor);
2346             if (item->y->isViewportPercentageLength())
2347                 y = viewportPercentageValue(*item->y, y);
2348             int blur = item->blur ? item->blur->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor) : 0;
2349             if (item->blur && item->blur->isViewportPercentageLength())
2350                 blur = viewportPercentageValue(*item->blur, blur);
2351             int spread = item->spread ? item->spread->computeLength<int>(state.style(), state.rootElementStyle(), zoomFactor) : 0;
2352             if (item->spread && item->spread->isViewportPercentageLength())
2353                 spread = viewportPercentageValue(*item->spread, spread);
2354             ShadowStyle shadowStyle = item->style && item->style->getValueID() == CSSValueInset ? Inset : Normal;
2355             Color color;
2356             if (item->color)
2357                 color = colorFromPrimitiveValue(item->color.get());
2358             else if (state.style())
2359                 color = state.style()->color();
2360
2361             OwnPtr<ShadowData> shadowData = adoptPtr(new ShadowData(IntPoint(x, y), blur, spread, shadowStyle, id == CSSPropertyWebkitBoxShadow, color.isValid() ? color : Color::transparent));
2362             if (id == CSSPropertyTextShadow)
2363                 state.style()->setTextShadow(shadowData.release(), i.index()); // add to the list if this is not the first entry
2364             else
2365                 state.style()->setBoxShadow(shadowData.release(), i.index()); // add to the list if this is not the first entry
2366         }
2367         return;
2368     }
2369     case CSSPropertyWebkitBoxReflect: {
2370         HANDLE_INHERIT_AND_INITIAL(boxReflect, BoxReflect)
2371         if (primitiveValue) {
2372             state.style()->setBoxReflect(RenderStyle::initialBoxReflect());
2373             return;
2374         }
2375
2376         if (!value->isReflectValue())
2377             return;
2378
2379         CSSReflectValue* reflectValue = toCSSReflectValue(value);
2380         RefPtr<StyleReflection> reflection = StyleReflection::create();
2381         reflection->setDirection(*reflectValue->direction());
2382         if (reflectValue->offset())
2383             reflection->setOffset(reflectValue->offset()->convertToLength<FixedIntegerConversion | PercentConversion | CalculatedConversion>(state.style(), state.rootElementStyle(), zoomFactor));
2384         NinePieceImage mask;
2385         mask.setMaskDefaults();
2386         m_styleMap.mapNinePieceImage(id, reflectValue->mask(), mask);
2387         reflection->setMask(mask);
2388
2389         state.style()->setBoxReflect(reflection.release());
2390         return;
2391     }
2392     case CSSPropertySrc: // Only used in @font-face rules.
2393         return;
2394     case CSSPropertyUnicodeRange: // Only used in @font-face rules.
2395         return;
2396     case CSSPropertyWebkitLocale: {
2397         HANDLE_INHERIT_AND_INITIAL(locale, Locale);
2398         if (!primitiveValue)
2399             return;
2400         if (primitiveValue->getValueID() == CSSValueAuto)
2401             state.style()->setLocale(nullAtom);
2402         else
2403             state.style()->setLocale(primitiveValue->getStringValue());
2404         FontDescription fontDescription = state.style()->fontDescription();
2405         fontDescription.setScript(localeToScriptCodeForFontSelection(state.style()->locale()));
2406         setFontDescription(fontDescription);
2407         return;
2408     }
2409 #if ENABLE(IOS_TEXT_AUTOSIZING)
2410     case CSSPropertyWebkitTextSizeAdjust: {
2411         HANDLE_INHERIT_AND_INITIAL(textSizeAdjust, TextSizeAdjust)
2412         if (!primitiveValue)
2413             return;
2414
2415         if (primitiveValue->getValueID() == CSSValueAuto)
2416             state.style()->setTextSizeAdjust(TextSizeAdjustment(AutoTextSizeAdjustment));
2417         else if (primitiveValue->getValueID() == CSSValueNone)
2418             state.style()->setTextSizeAdjust(TextSizeAdjustment(NoTextSizeAdjustment));
2419         else
2420             state.style()->setTextSizeAdjust(TextSizeAdjustment(primitiveValue->getFloatValue()));
2421
2422         state.setFontDirty(true);
2423         return;
2424     }
2425 #endif
2426 #if ENABLE(DASHBOARD_SUPPORT)
2427     case CSSPropertyWebkitDashboardRegion:
2428     {
2429         HANDLE_INHERIT_AND_INITIAL(dashboardRegions, DashboardRegions)
2430         if (!primitiveValue)
2431             return;
2432
2433         if (primitiveValue->getValueID() == CSSValueNone) {
2434             state.style()->setDashboardRegions(RenderStyle::noneDashboardRegions());
2435             return;
2436         }
2437
2438         DashboardRegion* region = primitiveValue->getDashboardRegionValue();
2439         if (!region)
2440             return;
2441
2442         DashboardRegion* first = region;
2443         while (region) {
2444             Length top = convertToIntLength(region->top(), state.style(), state.rootElementStyle());
2445             Length right = convertToIntLength(region->right(), state.style(), state.rootElementStyle());
2446             Length bottom = convertToIntLength(region->bottom(), state.style(), state.rootElementStyle());
2447             Length left = convertToIntLength(region->left(), state.style(), state.rootElementStyle());
2448
2449             if (top.isUndefined())
2450                 top = Length();
2451             if (right.isUndefined())
2452                 right = Length();
2453             if (bottom.isUndefined())
2454                 bottom = Length();
2455             if (left.isUndefined())
2456                 left = Length();
2457
2458             if (region->m_isCircle)
2459                 state.style()->setDashboardRegion(StyleDashboardRegion::Circle, region->m_label, top, right, bottom, left, region == first ? false : true);
2460             else if (region->m_isRectangle)
2461                 state.style()->setDashboardRegion(StyleDashboardRegion::Rectangle, region->m_label, top, right, bottom, left, region == first ? false : true);
2462             region = region->m_next.get();
2463         }
2464
2465         state.document().setHasAnnotatedRegions(true);
2466
2467         return;
2468     }
2469 #endif
2470 #if ENABLE(DRAGGABLE_REGION)
2471     case CSSPropertyWebkitAppRegion: {
2472         if (!primitiveValue || !primitiveValue->getValueID())
2473             return;
2474         state.style()->setDraggableRegionMode(primitiveValue->getValueID() == CSSValueDrag ? DraggableRegionDrag : DraggableRegionNoDrag);
2475         state.document().setHasAnnotatedRegions(true);
2476         return;
2477     }
2478 #endif
2479     case CSSPropertyWebkitTextStrokeWidth: {
2480         HANDLE_INHERIT_AND_INITIAL(textStrokeWidth, TextStrokeWidth)
2481         float width = 0;
2482         switch (primitiveValue->getValueID()) {
2483         case CSSValueThin:
2484         case CSSValueMedium:
2485         case CSSValueThick: {
2486             double result = 1.0 / 48;
2487             if (primitiveValue->getValueID() == CSSValueMedium)
2488                 result *= 3;
2489             else if (primitiveValue->getValueID() == CSSValueThick)
2490                 result *= 5;
2491             Ref<CSSPrimitiveValue> value(CSSPrimitiveValue::create(result, CSSPrimitiveValue::CSS_EMS));
2492             width = value.get().computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
2493             break;
2494         }
2495         default:
2496             width = primitiveValue->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
2497             break;
2498         }
2499         state.style()->setTextStrokeWidth(width);
2500         return;
2501     }
2502     case CSSPropertyWebkitTransform: {
2503         HANDLE_INHERIT_AND_INITIAL(transform, Transform);
2504         TransformOperations operations;
2505         transformsForValue(state.style(), state.rootElementStyle(), value, operations);
2506         state.style()->setTransform(operations);
2507         return;
2508     }
2509     case CSSPropertyWebkitPerspective: {
2510         HANDLE_INHERIT_AND_INITIAL(perspective, Perspective)
2511
2512         if (!primitiveValue)
2513             return;
2514
2515         if (primitiveValue->getValueID() == CSSValueNone) {
2516             state.style()->setPerspective(0);
2517             return;
2518         }
2519
2520         float perspectiveValue;
2521         if (primitiveValue->isLength())
2522             perspectiveValue = primitiveValue->computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
2523         else if (primitiveValue->isNumber()) {
2524             // For backward compatibility, treat valueless numbers as px.
2525             Ref<CSSPrimitiveValue> value(CSSPrimitiveValue::create(primitiveValue->getDoubleValue(), CSSPrimitiveValue::CSS_PX));
2526             perspectiveValue = value.get().computeLength<float>(state.style(), state.rootElementStyle(), zoomFactor);
2527         } else
2528             return;
2529
2530         if (perspectiveValue >= 0.0f)
2531             state.style()->setPerspective(perspectiveValue);
2532         return;
2533     }
2534 #if PLATFORM(IOS)
2535     case CSSPropertyWebkitTouchCallout: {
2536         HANDLE_INHERIT_AND_INITIAL(touchCalloutEnabled, TouchCalloutEnabled);
2537         if (!primitiveValue)
2538             break;
2539
2540         state.style()->setTouchCalloutEnabled(primitiveValue->getStringValue().lower() != "none");
2541         return;
2542     }
2543 #endif
2544 #if ENABLE(TOUCH_EVENTS)
2545     case CSSPropertyWebkitTapHighlightColor: {
2546         HANDLE_INHERIT_AND_INITIAL(tapHighlightColor, TapHighlightColor);
2547         if (!primitiveValue)
2548             break;
2549
2550         Color col = colorFromPrimitiveValue(primitiveValue);
2551         state.style()->setTapHighlightColor(col);
2552         return;
2553     }
2554 #endif
2555 #if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
2556     case CSSPropertyWebkitOverflowScrolling: {
2557         HANDLE_INHERIT_AND_INITIAL(useTouchOverflowScrolling, UseTouchOverflowScrolling);
2558         if (!primitiveValue)
2559             break;
2560         state.style()->setUseTouchOverflowScrolling(primitiveValue->getValueID() == CSSValueTouch);
2561         return;
2562     }
2563 #endif
2564     case CSSPropertyInvalid:
2565         return;
2566     case CSSPropertyFontStretch:
2567     case CSSPropertyPage:
2568     case CSSPropertyTextLineThrough:
2569     case CSSPropertyTextLineThroughColor:
2570     case CSSPropertyTextLineThroughMode:
2571     case CSSPropertyTextLineThroughStyle:
2572     case CSSPropertyTextLineThroughWidth:
2573     case CSSPropertyTextOverline:
2574     case CSSPropertyTextOverlineColor:
2575     case CSSPropertyTextOverlineMode:
2576     case CSSPropertyTextOverlineStyle:
2577     case CSSPropertyTextOverlineWidth:
2578     case CSSPropertyTextUnderline:
2579     case CSSPropertyTextUnderlineColor:
2580     case CSSPropertyTextUnderlineMode:
2581     case CSSPropertyTextUnderlineStyle:
2582     case CSSPropertyTextUnderlineWidth:
2583     case CSSPropertyWebkitFontSizeDelta:
2584     case CSSPropertyWebkitTextDecorationsInEffect:
2585         return;
2586
2587     // CSS Text Layout Module Level 3: Vertical writing support
2588     case CSSPropertyWebkitWritingMode: {
2589         HANDLE_INHERIT_AND_INITIAL(writingMode, WritingMode);
2590
2591         if (primitiveValue)
2592             setWritingMode(*primitiveValue);
2593
2594         // FIXME: It is not ok to modify document state while applying style.
2595         if (state.element() && state.element() == state.document().documentElement())
2596             state.document().setWritingModeSetOnDocumentElement(true);
2597         return;
2598     }
2599
2600     case CSSPropertyWebkitTextOrientation: {
2601         HANDLE_INHERIT_AND_INITIAL(textOrientation, TextOrientation);
2602
2603         if (primitiveValue)
2604             setTextOrientation(*primitiveValue);
2605
2606         return;
2607     }
2608
2609     case CSSPropertyWebkitLineBoxContain: {
2610         HANDLE_INHERIT_AND_INITIAL(lineBoxContain, LineBoxContain)
2611         if (primitiveValue && primitiveValue->getValueID() == CSSValueNone) {
2612             state.style()->setLineBoxContain(LineBoxContainNone);
2613             return;
2614         }
2615
2616         if (!value->isLineBoxContainValue())
2617             return;
2618
2619         state.style()->setLineBoxContain(toCSSLineBoxContainValue(value)->value());
2620         return;
2621     }
2622
2623     // CSS Fonts Module Level 3
2624     case CSSPropertyWebkitFontFeatureSettings: {
2625         if (primitiveValue && primitiveValue->getValueID() == CSSValueNormal) {
2626             setFontDescription(state.style()->fontDescription().makeNormalFeatureSettings());
2627             return;
2628         }
2629
2630         if (!value->isValueList())
2631             return;
2632
2633         FontDescription fontDescription = state.style()->fontDescription();
2634         CSSValueList* list = toCSSValueList(value);
2635         RefPtr<FontFeatureSettings> settings = FontFeatureSettings::create();
2636         int len = list->length();
2637         for (int i = 0; i < len; ++i) {
2638             CSSValue* item = list->itemWithoutBoundsCheck(i);
2639             if (!item->isFontFeatureValue())
2640                 continue;
2641             CSSFontFeatureValue* feature = toCSSFontFeatureValue(item);
2642             settings->append(FontFeature(feature->tag(), feature->value()));
2643         }
2644         fontDescription.setFeatureSettings(settings.release());
2645         setFontDescription(fontDescription);
2646         return;
2647     }
2648
2649 #if ENABLE(CSS_FILTERS)
2650     case CSSPropertyWebkitFilter: {
2651         HANDLE_INHERIT_AND_INITIAL(filter, Filter);
2652         FilterOperations operations;
2653         if (createFilterOperations(value, operations))
2654             state.style()->setFilter(operations);
2655         return;
2656     }
2657 #endif
2658     case CSSPropertyWebkitGridAutoColumns: {
2659         HANDLE_INHERIT_AND_INITIAL(gridAutoColumns, GridAutoColumns);
2660         GridTrackSize trackSize;
2661         if (!createGridTrackSize(value, trackSize, state))
2662             return;
2663         state.style()->setGridAutoColumns(trackSize);
2664         return;
2665     }
2666     case CSSPropertyWebkitGridAutoRows: {
2667         HANDLE_INHERIT_AND_INITIAL(gridAutoRows, GridAutoRows);
2668         GridTrackSize trackSize;
2669         if (!createGridTrackSize(value, trackSize, state))
2670             return;
2671         state.style()->setGridAutoRows(trackSize);
2672         return;
2673     }
2674     case CSSPropertyWebkitGridDefinitionColumns: {
2675         if (isInherit) {
2676             m_state.style()->setGridColumns(m_state.parentStyle()->gridColumns());
2677             m_state.style()->setNamedGridColumnLines(m_state.parentStyle()->namedGridColumnLines());
2678             return;
2679         }
2680         if (isInitial) {
2681             m_state.style()->setGridColumns(RenderStyle::initialGridColumns());
2682             m_state.style()->setNamedGridColumnLines(RenderStyle::initialNamedGridColumnLines());
2683             return;
2684         }
2685         Vector<GridTrackSize> trackSizes;
2686         NamedGridLinesMap namedGridLines;
2687         if (!createGridTrackList(value, trackSizes, namedGridLines, state))
2688             return;
2689         state.style()->setGridColumns(trackSizes);
2690         state.style()->setNamedGridColumnLines(namedGridLines);
2691         return;
2692     }
2693     case CSSPropertyWebkitGridDefinitionRows: {
2694         if (isInherit) {
2695             m_state.style()->setGridRows(m_state.parentStyle()->gridRows());
2696             m_state.style()->setNamedGridRowLines(m_state.parentStyle()->namedGridRowLines());
2697             return;
2698         }
2699         if (isInitial) {
2700             m_state.style()->setGridRows(RenderStyle::initialGridRows());
2701             m_state.style()->setNamedGridRowLines(RenderStyle::initialNamedGridRowLines());
2702             return;
2703         }
2704         Vector<GridTrackSize> trackSizes;
2705         NamedGridLinesMap namedGridLines;
2706         if (!createGridTrackList(value, trackSizes, namedGridLines, state))
2707             return;
2708         state.style()->setGridRows(trackSizes);
2709         state.style()->setNamedGridRowLines(namedGridLines);
2710         return;
2711     }
2712
2713     case CSSPropertyWebkitGridColumnStart: {
2714         GridPosition columnStartPosition;
2715         if (!createGridPosition(value, columnStartPosition))
2716             return;
2717         state.style()->setGridItemColumnStart(columnStartPosition);
2718         return;
2719     }
2720     case CSSPropertyWebkitGridColumnEnd: {
2721         GridPosition columnEndPosition;
2722         if (!createGridPosition(value, columnEndPosition))
2723             return;
2724         state.style()->setGridItemColumnEnd(columnEndPosition);
2725         return;
2726     }
2727
2728     case CSSPropertyWebkitGridRowStart: {
2729         GridPosition rowStartPosition;
2730         if (!createGridPosition(value, rowStartPosition))
2731             return;
2732         state.style()->setGridItemRowStart(rowStartPosition);
2733         return;
2734     }
2735     case CSSPropertyWebkitGridRowEnd: {
2736         GridPosition rowEndPosition;
2737         if (!createGridPosition(value, rowEndPosition))
2738             return;
2739         state.style()->setGridItemRowEnd(rowEndPosition);
2740         return;
2741     }
2742     case CSSPropertyWebkitGridTemplate: {
2743         if (isInherit) {
2744             state.style()->setNamedGridArea(state.parentStyle()->namedGridArea());
2745             state.style()->setNamedGridAreaRowCount(state.parentStyle()->namedGridAreaRowCount());
2746             state.style()->setNamedGridAreaColumnCount(state.parentStyle()->namedGridAreaColumnCount());
2747             return;
2748         }
2749         if (isInitial) {
2750             state.style()->setNamedGridArea(RenderStyle::initialNamedGridArea());
2751             state.style()->setNamedGridAreaRowCount(RenderStyle::initialNamedGridAreaCount());
2752             state.style()->setNamedGridAreaColumnCount(RenderStyle::initialNamedGridAreaCount());
2753             return;
2754         }
2755
2756         if (value->isPrimitiveValue()) {
2757             ASSERT(toCSSPrimitiveValue(value)->getValueID() == CSSValueNone);
2758             return;
2759         }
2760
2761         CSSGridTemplateValue* gridTemplateValue = toCSSGridTemplateValue(value);
2762         state.style()->setNamedGridArea(gridTemplateValue->gridAreaMap());
2763         state.style()->setNamedGridAreaRowCount(gridTemplateValue->rowCount());
2764         state.style()->setNamedGridAreaColumnCount(gridTemplateValue->columnCount());
2765         return;
2766     }
2767
2768     // These properties are aliased and DeprecatedStyleBuilder already applied the property on the prefixed version.
2769     case CSSPropertyTransitionDelay:
2770     case CSSPropertyTransitionDuration:
2771     case CSSPropertyTransitionProperty:
2772     case CSSPropertyTransitionTimingFunction:
2773         return;
2774     // These properties are implemented in the DeprecatedStyleBuilder lookup table.
2775     case CSSPropertyBackgroundAttachment:
2776     case CSSPropertyBackgroundClip:
2777     case CSSPropertyBackgroundColor:
2778     case CSSPropertyBackgroundImage:
2779     case CSSPropertyBackgroundOrigin:
2780     case CSSPropertyBackgroundPositionX:
2781     case CSSPropertyBackgroundPositionY:
2782     case CSSPropertyBackgroundRepeatX:
2783     case CSSPropertyBackgroundRepeatY:
2784     case CSSPropertyBackgroundSize:
2785     case CSSPropertyBorderBottomColor:
2786     case CSSPropertyBorderBottomLeftRadius:
2787     case CSSPropertyBorderBottomRightRadius:
2788     case CSSPropertyBorderBottomStyle:
2789     case CSSPropertyBorderBottomWidth:
2790     case CSSPropertyBorderCollapse:
2791     case CSSPropertyBorderImageOutset:
2792     case CSSPropertyBorderImageRepeat:
2793     case CSSPropertyBorderImageSlice:
2794     case CSSPropertyBorderImageSource:
2795     case CSSPropertyBorderImageWidth:
2796     case CSSPropertyBorderLeftColor:
2797     case CSSPropertyBorderLeftStyle:
2798     case CSSPropertyBorderLeftWidth:
2799     case CSSPropertyBorderRightColor:
2800     case CSSPropertyBorderRightStyle:
2801     case CSSPropertyBorderRightWidth:
2802     case CSSPropertyBorderTopColor:
2803     case CSSPropertyBorderTopLeftRadius:
2804     case CSSPropertyBorderTopRightRadius:
2805     case CSSPropertyBorderTopStyle:
2806     case CSSPropertyBorderTopWidth:
2807     case CSSPropertyBottom:
2808     case CSSPropertyBoxSizing:
2809     case CSSPropertyCaptionSide:
2810     case CSSPropertyClear:
2811     case CSSPropertyClip:
2812     case CSSPropertyColor:
2813     case CSSPropertyCounterIncrement:
2814     case CSSPropertyCounterReset:
2815     case CSSPropertyCursor:
2816     case CSSPropertyDirection:
2817     case CSSPropertyDisplay:
2818     case CSSPropertyEmptyCells:
2819     case CSSPropertyFloat:
2820     case CSSPropertyFontSize:
2821     case CSSPropertyFontStyle:
2822     case CSSPropertyFontVariant:
2823     case CSSPropertyFontWeight:
2824     case CSSPropertyHeight:
2825 #if ENABLE(CSS_IMAGE_ORIENTATION)
2826     case CSSPropertyImageOrientation:
2827 #endif
2828     case CSSPropertyImageRendering:
2829 #if ENABLE(CSS_IMAGE_RESOLUTION)
2830     case CSSPropertyImageResolution:
2831 #endif
2832     case CSSPropertyLeft:
2833     case CSSPropertyLetterSpacing:
2834     case CSSPropertyLineHeight:
2835     case CSSPropertyListStyleImage:
2836     case CSSPropertyListStylePosition:
2837     case CSSPropertyListStyleType:
2838     case CSSPropertyMarginBottom:
2839     case CSSPropertyMarginLeft:
2840     case CSSPropertyMarginRight:
2841     case CSSPropertyMarginTop:
2842     case CSSPropertyMaxHeight:
2843     case CSSPropertyMaxWidth:
2844     case CSSPropertyMinHeight:
2845     case CSSPropertyMinWidth:
2846     case CSSPropertyObjectFit:
2847     case CSSPropertyOpacity:
2848     case CSSPropertyOrphans:
2849     case CSSPropertyOutlineColor:
2850     case CSSPropertyOutlineOffset:
2851     case CSSPropertyOutlineStyle:
2852     case CSSPropertyOutlineWidth:
2853     case CSSPropertyOverflowWrap:
2854     case CSSPropertyOverflowX:
2855     case CSSPropertyOverflowY:
2856     case CSSPropertyPaddingBottom:
2857     case CSSPropertyPaddingLeft:
2858     case CSSPropertyPaddingRight:
2859     case CSSPropertyPaddingTop:
2860     case CSSPropertyPageBreakAfter:
2861     case CSSPropertyPageBreakBefore:
2862     case CSSPropertyPageBreakInside:
2863     case CSSPropertyPointerEvents:
2864     case CSSPropertyPosition:
2865     case CSSPropertyResize:
2866     case CSSPropertyRight:
2867     case CSSPropertySize:
2868     case CSSPropertySpeak:
2869     case CSSPropertyTabSize:
2870     case CSSPropertyTableLayout:
2871     case CSSPropertyTextAlign:
2872     case CSSPropertyTextDecoration:
2873     case CSSPropertyTextIndent:
2874     case CSSPropertyTextOverflow:
2875     case CSSPropertyTextRendering:
2876     case CSSPropertyTextTransform:
2877     case CSSPropertyTop:
2878     case CSSPropertyUnicodeBidi:
2879     case CSSPropertyVerticalAlign:
2880     case CSSPropertyVisibility:
2881     case CSSPropertyWebkitAnimationDelay:
2882     case CSSPropertyWebkitAnimationDirection:
2883     case CSSPropertyWebkitAnimationDuration:
2884     case CSSPropertyWebkitAnimationFillMode:
2885     case CSSPropertyWebkitAnimationIterationCount:
2886     case CSSPropertyWebkitAnimationName:
2887     case CSSPropertyWebkitAnimationPlayState:
2888     case CSSPropertyWebkitAnimationTimingFunction:
2889     case CSSPropertyWebkitAppearance:
2890     case CSSPropertyWebkitAspectRatio:
2891     case CSSPropertyWebkitBackfaceVisibility:
2892     case CSSPropertyWebkitBackgroundClip:
2893     case CSSPropertyWebkitBackgroundComposite:
2894     case CSSPropertyWebkitBackgroundOrigin:
2895     case CSSPropertyWebkitBackgroundSize:
2896     case CSSPropertyWebkitBorderFit:
2897     case CSSPropertyWebkitBorderHorizontalSpacing:
2898     case CSSPropertyWebkitBorderImage:
2899     case CSSPropertyWebkitBorderVerticalSpacing:
2900     case CSSPropertyWebkitBoxAlign:
2901 #if ENABLE(CSS_BOX_DECORATION_BREAK)
2902     case CSSPropertyWebkitBoxDecorationBreak:
2903 #endif
2904     case CSSPropertyWebkitBoxDirection:
2905     case CSSPropertyWebkitBoxFlex:
2906     case CSSPropertyWebkitBoxFlexGroup:
2907     case CSSPropertyWebkitBoxLines:
2908     case CSSPropertyWebkitBoxOrdinalGroup:
2909     case CSSPropertyWebkitBoxOrient:
2910     case CSSPropertyWebkitBoxPack:
2911     case CSSPropertyWebkitColorCorrection:
2912     case CSSPropertyWebkitColumnAxis:
2913     case CSSPropertyWebkitColumnBreakAfter:
2914     case CSSPropertyWebkitColumnBreakBefore:
2915     case CSSPropertyWebkitColumnBreakInside:
2916     case CSSPropertyWebkitColumnCount:
2917     case CSSPropertyWebkitColumnGap:
2918     case CSSPropertyWebkitColumnProgression:
2919     case CSSPropertyWebkitColumnRuleColor:
2920     case CSSPropertyWebkitColumnRuleStyle:
2921     case CSSPropertyWebkitColumnRuleWidth:
2922     case CSSPropertyWebkitColumnSpan:
2923     case CSSPropertyWebkitColumnWidth:
2924 #if ENABLE(CURSOR_VISIBILITY)
2925     case CSSPropertyWebkitCursorVisibility:
2926 #endif
2927     case CSSPropertyWebkitAlignContent:
2928     case CSSPropertyWebkitAlignItems:
2929     case CSSPropertyWebkitAlignSelf:
2930     case CSSPropertyWebkitFlexBasis:
2931     case CSSPropertyWebkitFlexDirection:
2932     case CSSPropertyWebkitFlexGrow:
2933     case CSSPropertyWebkitFlexShrink:
2934     case CSSPropertyWebkitFlexWrap:
2935     case CSSPropertyWebkitJustifyContent:
2936     case CSSPropertyWebkitOrder:
2937 #if ENABLE(CSS_REGIONS)
2938     case CSSPropertyWebkitFlowFrom:
2939     case CSSPropertyWebkitFlowInto:
2940 #endif
2941     case CSSPropertyWebkitFontKerning:
2942     case CSSPropertyWebkitFontSmoothing:
2943     case CSSPropertyWebkitFontVariantLigatures:
2944     case CSSPropertyWebkitHighlight:
2945     case CSSPropertyWebkitHyphenateCharacter:
2946     case CSSPropertyWebkitHyphenateLimitAfter:
2947     case CSSPropertyWebkitHyphenateLimitBefore:
2948     case CSSPropertyWebkitHyphenateLimitLines:
2949     case CSSPropertyWebkitHyphens:
2950     case CSSPropertyWebkitLineAlign:
2951     case CSSPropertyWebkitLineBreak:
2952     case CSSPropertyWebkitLineClamp:
2953     case CSSPropertyWebkitLineGrid:
2954     case CSSPropertyWebkitLineSnap:
2955     case CSSPropertyWebkitMarqueeDirection:
2956     case CSSPropertyWebkitMarqueeIncrement:
2957     case CSSPropertyWebkitMarqueeRepetition:
2958     case CSSPropertyWebkitMarqueeSpeed:
2959     case CSSPropertyWebkitMarqueeStyle:
2960     case CSSPropertyWebkitMaskBoxImage:
2961     case CSSPropertyWebkitMaskBoxImageOutset:
2962     case CSSPropertyWebkitMaskBoxImageRepeat:
2963     case CSSPropertyWebkitMaskBoxImageSlice:
2964     case CSSPropertyWebkitMaskBoxImageSource:
2965     case CSSPropertyWebkitMaskBoxImageWidth:
2966     case CSSPropertyWebkitMaskClip:
2967     case CSSPropertyWebkitMaskComposite:
2968     case CSSPropertyWebkitMaskImage:
2969     case CSSPropertyWebkitMaskOrigin:
2970     case CSSPropertyWebkitMaskPositionX:
2971     case CSSPropertyWebkitMaskPositionY:
2972     case CSSPropertyWebkitMaskRepeatX:
2973     case CSSPropertyWebkitMaskRepeatY:
2974     case CSSPropertyWebkitMaskSize:
2975     case CSSPropertyWebkitMaskSourceType:
2976     case CSSPropertyWebkitNbspMode:
2977     case CSSPropertyWebkitPerspectiveOrigin:
2978     case CSSPropertyWebkitPerspectiveOriginX:
2979     case CSSPropertyWebkitPerspectiveOriginY:
2980     case CSSPropertyWebkitPrintColorAdjust:
2981 #if ENABLE(CSS_REGIONS)
2982     case CSSPropertyWebkitRegionBreakAfter:
2983     case CSSPropertyWebkitRegionBreakBefore:
2984     case CSSPropertyWebkitRegionBreakInside:
2985     case CSSPropertyWebkitRegionFragment:
2986 #endif
2987     case CSSPropertyWebkitRtlOrdering:
2988     case CSSPropertyWebkitRubyPosition:
2989     case CSSPropertyWebkitTextCombine:
2990 #if ENABLE(CSS3_TEXT)
2991     case CSSPropertyWebkitTextAlignLast:
2992     case CSSPropertyWebkitTextJustify:
2993 #endif // CSS3_TEXT
2994 #if ENABLE(CSS3_TEXT_DECORATION)
2995     case CSSPropertyWebkitTextDecorationLine:
2996     case CSSPropertyWebkitTextDecorationStyle:
2997     case CSSPropertyWebkitTextDecorationColor:
2998     case CSSPropertyWebkitTextDecorationSkip:
2999     case CSSPropertyWebkitTextUnderlinePosition:
3000 #endif
3001     case CSSPropertyWebkitTextEmphasisColor:
3002     case CSSPropertyWebkitTextEmphasisPosition:
3003     case CSSPropertyWebkitTextEmphasisStyle:
3004     case CSSPropertyWebkitTextFillColor:
3005     case CSSPropertyWebkitTextSecurity:
3006     case CSSPropertyWebkitTextStrokeColor:
3007     case CSSPropertyWebkitTransformOriginX:
3008     case CSSPropertyWebkitTransformOriginY:
3009     case CSSPropertyWebkitTransformOriginZ:
3010     case CSSPropertyWebkitTransformStyle:
3011     case CSSPropertyWebkitTransitionDelay:
3012     case CSSPropertyWebkitTransitionDuration:
3013     case CSSPropertyWebkitTransitionProperty:
3014     case CSSPropertyWebkitTransitionTimingFunction:
3015     case CSSPropertyWebkitUserDrag:
3016     case CSSPropertyWebkitUserModify:
3017     case CSSPropertyWebkitUserSelect:
3018     case CSSPropertyWebkitClipPath:
3019 #if ENABLE(CSS_SHAPES)
3020     case CSSPropertyWebkitShapeMargin:
3021     case CSSPropertyWebkitShapePadding:
3022     case CSSPropertyWebkitShapeImageThreshold:
3023     case CSSPropertyWebkitShapeInside:
3024     case CSSPropertyWebkitShapeOutside:
3025 #endif
3026 #if ENABLE(CSS_EXCLUSIONS)
3027     case CSSPropertyWebkitWrapFlow:
3028     case CSSPropertyWebkitWrapThrough:
3029 #endif
3030 #if ENABLE(CSS_SHADERS)
3031     case CSSPropertyMix:
3032     case CSSPropertyParameters:
3033 #endif
3034     case CSSPropertyWhiteSpace:
3035     case CSSPropertyWidows:
3036     case CSSPropertyWidth:
3037     case CSSPropertyWordBreak:
3038     case CSSPropertyWordSpacing:
3039     case CSSPropertyWordWrap:
3040     case CSSPropertyZIndex:
3041     case CSSPropertyZoom:
3042 #if ENABLE(CSS_DEVICE_ADAPTATION)
3043     case CSSPropertyMaxZoom:
3044     case CSSPropertyMinZoom:
3045     case CSSPropertyOrientation:
3046     case CSSPropertyUserZoom:
3047 #endif
3048         ASSERT_NOT_REACHED();
3049         return;
3050     default:
3051 #if ENABLE(SVG)
3052         // Try the SVG properties
3053         applySVGProperty(id, value);
3054 #endif
3055         return;
3056     }
3057 }
3058
3059 PassRefPtr<StyleImage> StyleResolver::styleImage(CSSPropertyID property, CSSValue* value)
3060 {
3061     if (value->isImageValue())
3062         return cachedOrPendingFromValue(property, toCSSImageValue(value));
3063
3064     if (value->isImageGeneratorValue()) {
3065         if (value->isGradientValue())
3066             return generatedOrPendingFromValue(property, toCSSGradientValue(value)->gradientWithStylesResolved(this).get());
3067         return generatedOrPendingFromValue(property, static_cast<CSSImageGeneratorValue*>(value));
3068     }
3069
3070 #if ENABLE(CSS_IMAGE_SET)
3071     if (value->isImageSetValue())
3072         return setOrPendingFromValue(property, toCSSImageSetValue(value));
3073 #endif
3074
3075     if (value->isCursorImageValue())
3076         return cursorOrPendingFromValue(property, toCSSCursorImageValue(value));
3077
3078     return 0;
3079 }
3080
3081 PassRefPtr<StyleImage> StyleResolver::cachedOrPendingFromValue(CSSPropertyID property, CSSImageValue* value)
3082 {
3083     RefPtr<StyleImage> image = value->cachedOrPendingImage();
3084     if (image && image->isPendingImage())
3085         m_state.pendingImageProperties().set(property, value);
3086     return image.release();
3087 }
3088
3089 PassRefPtr<StyleImage> StyleResolver::generatedOrPendingFromValue(CSSPropertyID property, CSSImageGeneratorValue* value)
3090 {
3091 #if ENABLE(CSS_FILTERS)
3092     if (value->isFilterImageValue()) {
3093         // FilterImage needs to calculate FilterOperations.
3094         toCSSFilterImageValue(value)->createFilterOperations(this);
3095     }
3096 #endif
3097     if (value->isPending()) {
3098         m_state.pendingImageProperties().set(property, value);
3099         return StylePendingImage::create(value);
3100     }
3101     return StyleGeneratedImage::create(value);
3102 }
3103
3104 #if ENABLE(CSS_IMAGE_SET)
3105 PassRefPtr<StyleImage> StyleResolver::setOrPendingFromValue(CSSPropertyID property, CSSImageSetValue* value)
3106 {
3107     RefPtr<StyleImage> image = value->cachedOrPendingImageSet(document());
3108     if (image && image->isPendingImage())
3109         m_state.pendingImageProperties().set(property, value);
3110     return image.release();
3111 }
3112 #endif
3113
3114 PassRefPtr<StyleImage> StyleResolver::cursorOrPendingFromValue(CSSPropertyID property, CSSCursorImageValue* value)
3115 {
3116     RefPtr<StyleImage> image = value->cachedOrPendingImage(document());
3117     if (image && image->isPendingImage())
3118         m_state.pendingImageProperties().set(property, value);
3119     return image.release();
3120 }
3121
3122 #if ENABLE(IOS_TEXT_AUTOSIZING)
3123 void StyleResolver::checkForTextSizeAdjust(RenderStyle* style)
3124 {
3125     if (style->textSizeAdjust().isAuto())
3126         return;
3127
3128     FontDescription newFontDescription(style->fontDescription());
3129     if (!style->textSizeAdjust().isNone())
3130         newFontDescription.setComputedSize(newFontDescription.specifiedSize() * style->textSizeAdjust().multiplier());
3131     else
3132         newFontDescription.setComputedSize(newFontDescription.specifiedSize());
3133     style->setFontDescription(newFontDescription);
3134 }
3135 #endif
3136
3137 void StyleResolver::checkForZoomChange(RenderStyle* style, RenderStyle* parentStyle)
3138 {
3139     if (style->effectiveZoom() == parentStyle->effectiveZoom())
3140         return;
3141
3142     const FontDescription& childFont = style->fontDescription();
3143     FontDescription newFontDescription(childFont);
3144     setFontSize(newFontDescription, childFont.specifiedSize());
3145     style->setFontDescription(newFontDescription);
3146 }
3147
3148 void StyleResolver::checkForGenericFamilyChange(RenderStyle* style, RenderStyle* parentStyle)
3149 {
3150     const FontDescription& childFont = style->fontDescription();
3151
3152     if (childFont.isAbsoluteSize() || !parentStyle)
3153         return;
3154
3155     const FontDescription& parentFont = parentStyle->fontDescription();
3156     if (childFont.useFixedDefaultSize() == parentFont.useFixedDefaultSize())
3157         return;
3158
3159     // For now, lump all families but monospace together.
3160     if (childFont.genericFamily() != FontDescription::MonospaceFamily
3161         && parentFont.genericFamily() != FontDescription::MonospaceFamily)
3162         return;
3163
3164     // We know the parent is monospace or the child is monospace, and that font
3165     // size was unspecified. We want to scale our font size as appropriate.
3166     // If the font uses a keyword size, then we refetch from the table rather than
3167     // multiplying by our scale factor.
3168     float size;
3169     if (childFont.keywordSize())
3170         size = Style::fontSizeForKeyword(CSSValueXxSmall + childFont.keywordSize() - 1, childFont.useFixedDefaultSize(), document());
3171     else {
3172         Settings* settings = documentSettings();
3173         float fixedScaleFactor = (settings && settings->defaultFixedFontSize() && settings->defaultFontSize())
3174             ? static_cast<float>(settings->defaultFixedFontSize()) / settings->defaultFontSize()
3175             : 1;
3176         size = parentFont.useFixedDefaultSize() ?
3177                 childFont.specifiedSize() / fixedScaleFactor :
3178                 childFont.specifiedSize() * fixedScaleFactor;
3179     }
3180
3181     FontDescription newFontDescription(childFont);
3182     setFontSize(newFontDescription, size);
3183     style->setFontDescription(newFontDescription);
3184 }
3185
3186 void StyleResolver::initializeFontStyle(Settings* settings)
3187 {
3188     FontDescription fontDescription;
3189     fontDescription.setGenericFamily(FontDescription::StandardFamily);
3190     fontDescription.setRenderingMode(settings->fontRenderingMode());
3191     fontDescription.setUsePrinterFont(document().printing() || !settings->screenFontSubstitutionEnabled());
3192     const AtomicString& standardFontFamily = documentSettings()->standardFontFamily();
3193     if (!standardFontFamily.isEmpty())
3194         fontDescription.setOneFamily(standardFontFamily);
3195     fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
3196     setFontSize(fontDescription, Style::fontSizeForKeyword(CSSValueMedium, false, document()));
3197     m_state.style()->setLineHeight(RenderStyle::initialLineHeight());
3198     m_state.setLineHeightValue(0);
3199     setFontDescription(fontDescription);
3200 }
3201
3202 void StyleResolver::setFontSize(FontDescription& fontDescription, float size)
3203 {
3204     fontDescription.setSpecifiedSize(size);
3205     fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSize(size, fontDescription.isAbsoluteSize(), useSVGZoomRules(), m_state.style(), document()));
3206 }
3207
3208 static Color colorForCSSValue(CSSValueID cssValueId)
3209 {
3210     struct ColorValue {
3211         CSSValueID cssValueId;
3212         RGBA32 color;
3213     };
3214
3215     static const ColorValue colorValues[] = {
3216         { CSSValueAqua, 0xFF00FFFF },
3217         { CSSValueBlack, 0xFF000000 },
3218         { CSSValueBlue, 0xFF0000FF },
3219         { CSSValueFuchsia, 0xFFFF00FF },
3220         { CSSValueGray, 0xFF808080 },
3221         { CSSValueGreen, 0xFF008000  },
3222         { CSSValueGrey, 0xFF808080 },
3223         { CSSValueLime, 0xFF00FF00 },
3224         { CSSValueMaroon, 0xFF800000 },
3225         { CSSValueNavy, 0xFF000080 },
3226         { CSSValueOlive, 0xFF808000  },
3227         { CSSValueOrange, 0xFFFFA500 },
3228         { CSSValuePurple, 0xFF800080 },
3229         { CSSValueRed, 0xFFFF0000 },
3230         { CSSValueSilver, 0xFFC0C0C0 },
3231         { CSSValueTeal, 0xFF008080  },
3232         { CSSValueTransparent, 0x00000000 },
3233         { CSSValueWhite, 0xFFFFFFFF },
3234         { CSSValueYellow, 0xFFFFFF00 },
3235         { CSSValueInvalid, CSSValueInvalid }
3236     };
3237
3238     for (const ColorValue* col = colorValues; col->cssValueId; ++col) {
3239         if (col->cssValueId == cssValueId)
3240             return col->color;
3241     }
3242     return RenderTheme::defaultTheme()->systemColor(cssValueId);
3243 }
3244
3245 bool StyleResolver::colorFromPrimitiveValueIsDerivedFromElement(CSSPrimitiveValue* value)
3246 {
3247     int ident = value->getValueID();
3248     switch (ident) {
3249     case CSSValueWebkitText:
3250     case CSSValueWebkitLink:
3251     case CSSValueWebkitActivelink:
3252     case CSSValueCurrentcolor:
3253         return true;
3254     default:
3255         return false;
3256     }
3257 }
3258
3259 Color StyleResolver::colorFromPrimitiveValue(CSSPrimitiveValue* value, bool forVisitedLink) const
3260 {
3261     if (value->isRGBColor())
3262         return Color(value->getRGBA32Value());
3263
3264     const State& state = m_state;
3265     CSSValueID ident = value->getValueID();
3266     switch (ident) {
3267     case 0:
3268         return Color();
3269     case CSSValueWebkitText:
3270         return state.document().textColor();
3271     case CSSValueWebkitLink:
3272         return (state.element()->isLink() && forVisitedLink) ? state.document().visitedLinkColor() : state.document().linkColor();
3273     case CSSValueWebkitActivelink:
3274         return state.document().activeLinkColor();
3275     case CSSValueWebkitFocusRingColor:
3276         return RenderTheme::focusRingColor();
3277     case CSSValueCurrentcolor:
3278         return state.style()->color();
3279     default:
3280         return colorForCSSValue(ident);
3281     }
3282 }
3283
3284 void StyleResolver::addViewportDependentMediaQueryResult(const MediaQueryExp* expr, bool result)
3285 {
3286     m_viewportDependentMediaQueryResults.append(adoptPtr(new MediaQueryResult(*expr, result)));
3287 }
3288
3289 bool StyleResolver::affectedByViewportChange() const
3290 {
3291     unsigned s = m_viewportDependentMediaQueryResults.size();
3292     for (unsigned i = 0; i < s; i++) {
3293         if (m_medium->eval(&m_viewportDependentMediaQueryResults[i]->m_expression) != m_viewportDependentMediaQueryResults[i]->m_result)
3294             return true;
3295     }
3296     return false;
3297 }
3298
3299 #if ENABLE(CSS_FILTERS)
3300 static FilterOperation::OperationType filterOperationForType(WebKitCSSFilterValue::FilterOperationType type)
3301 {
3302     switch (type) {
3303     case WebKitCSSFilterValue::ReferenceFilterOperation:
3304         return FilterOperation::REFERENCE;
3305     case WebKitCSSFilterValue::GrayscaleFilterOperation:
3306         return FilterOperation::GRAYSCALE;
3307     case WebKitCSSFilterValue::SepiaFilterOperation:
3308         return FilterOperation::SEPIA;
3309     case WebKitCSSFilterValue::SaturateFilterOperation:
3310         return FilterOperation::SATURATE;
3311     case WebKitCSSFilterValue::HueRotateFilterOperation:
3312         return FilterOperation::HUE_ROTATE;
3313     case WebKitCSSFilterValue::InvertFilterOperation:
3314         return FilterOperation::INVERT;
3315     case WebKitCSSFilterValue::OpacityFilterOperation:
3316         return FilterOperation::OPACITY;
3317     case WebKitCSSFilterValue::BrightnessFilterOperation:
3318         return FilterOperation::BRIGHTNESS;
3319     case WebKitCSSFilterValue::ContrastFilterOperation:
3320         return FilterOperation::CONTRAST;
3321     case WebKitCSSFilterValue::BlurFilterOperation:
3322         return FilterOperation::BLUR;
3323     case WebKitCSSFilterValue::DropShadowFilterOperation:
3324         return FilterOperation::DROP_SHADOW;
3325 #if ENABLE(CSS_SHADERS)
3326     case WebKitCSSFilterValue::CustomFilterOperation:
3327         return FilterOperation::CUSTOM;
3328 #endif
3329     case WebKitCSSFilterValue::UnknownFilterOperation:
3330         return FilterOperation::NONE;
3331     }
3332     return FilterOperation::NONE;
3333 }
3334
3335 #if ENABLE(CSS_FILTERS) && ENABLE(SVG)
3336 void StyleResolver::loadPendingSVGDocuments()
3337 {
3338     State& state = m_state;
3339
3340     // Crash reports indicate that we've seen calls to this function when our
3341     // style is NULL. We don't know exactly why this happens. Our guess is
3342     // reentering styleForElement().
3343     ASSERT(state.style());
3344     if (!state.style() || !state.style()->hasFilter() || state.pendingSVGDocuments().isEmpty())
3345         return;
3346
3347     CachedResourceLoader* cachedResourceLoader = state.document().cachedResourceLoader();
3348     Vector<RefPtr<FilterOperation>>& filterOperations = state.style()->mutableFilter().operations();
3349     for (unsigned i = 0; i < filterOperations.size(); ++i) {
3350         RefPtr<FilterOperation> filterOperation = filterOperations.at(i);
3351         if (filterOperation->type() == FilterOperation::REFERENCE) {
3352             ReferenceFilterOperation* referenceFilter = static_cast<ReferenceFilterOperation*>(filterOperation.get());
3353
3354             WebKitCSSSVGDocumentValue* value = state.pendingSVGDocuments().get(referenceFilter);
3355             if (!value)
3356                 continue;
3357             CachedSVGDocument* cachedDocument = value->load(cachedResourceLoader);
3358             if (!cachedDocument)
3359                 continue;
3360
3361             // Stash the CachedSVGDocument on the reference filter.
3362             referenceFilter->setCachedSVGDocumentReference(adoptPtr(new CachedSVGDocumentReference(cachedDocument)));
3363         }
3364     }
3365     state.pendingSVGDocuments().clear();
3366 }
3367 #endif
3368
3369 #if ENABLE(CSS_SHADERS)
3370 StyleShader* StyleResolver::styleShader(CSSValue* value)
3371 {
3372     if (value->isWebKitCSSShaderValue())
3373         return cachedOrPendingStyleShaderFromValue(toWebKitCSSShaderValue(value));
3374     return 0;
3375 }
3376
3377 StyleShader* StyleResolver::cachedOrPendingStyleShaderFromValue(WebKitCSSShaderValue* value)
3378 {
3379     StyleShader* shader = value->cachedOrPendingShader();
3380     if (shader && shader->isPendingShader())
3381         m_state.setHasPendingShaders(true);
3382     return shader;
3383 }
3384
3385 PassRefPtr<CustomFilterProgram> StyleResolver::lookupCustomFilterProgram(WebKitCSSShaderValue* vertexShader, WebKitCSSShaderValue* fragmentShader,
3386     CustomFilterProgramType programType, const CustomFilterProgramMixSettings& mixSettings, CustomFilterMeshType meshType)
3387 {
3388     CachedResourceLoader* cachedResourceLoader = m_state.document().cachedResourceLoader();
3389     URL vertexShaderURL = vertexShader ? vertexShader->completeURL(cachedResourceLoader) : URL();
3390     URL fragmentShaderURL = fragmentShader ? fragmentShader->completeURL(cachedResourceLoader) : URL();
3391     RefPtr<StyleCustomFilterProgram> program;
3392     if (m_customFilterProgramCache)
3393         program = m_customFilterProgramCache->lookup(CustomFilterProgramInfo(vertexShaderURL, fragmentShaderURL, programType, mixSettings, meshType));
3394     if (!program) {
3395         // Create a new StyleCustomFilterProgram that will be resolved during the loadPendingShaders and added to the cache.
3396         program = StyleCustomFilterProgram::create(vertexShaderURL, vertexShader ? styleShader(vertexShader) : 0,
3397             fragmentShaderURL, fragmentShader ? styleShader(fragmentShader) : 0, programType, mixSettings, meshType);
3398     }
3399     return program.release();
3400 }
3401
3402 void StyleResolver::loadPendingShaders()
3403 {
3404     // FIXME: We shouldn't have to check that style is non-null. This is a speculative fix for:
3405     // https://bugs.webkit.org/show_bug.cgi?id=117665
3406     if (!m_state.hasPendingShaders() || !m_state.style() || !m_state.style()->hasFilter())
3407         return;
3408
3409     CachedResourceLoader* cachedResourceLoader = m_state.document().cachedResourceLoader();
3410
3411     Vector<RefPtr<FilterOperation>>& filterOperations = m_state.style()->mutableFilter().operations();
3412     for (unsigned i = 0; i < filterOperations.size(); ++i) {
3413         RefPtr<FilterOperation> filterOperation = filterOperations.at(i);
3414         if (filterOperation->type() == FilterOperation::CUSTOM) {
3415             CustomFilterOperation* customFilter = static_cast<CustomFilterOperation*>(filterOperation.get());
3416             ASSERT(customFilter->program());
3417             StyleCustomFilterProgram* program = static_cast<StyleCustomFilterProgram*>(customFilter->program());
3418             // Note that the StylePendingShaders could be already resolved to StyleCachedShaders. That's because the rule was matched before.
3419             // However, the StyleCustomFilterProgram that was initially created could have been removed from the cache in the meanwhile,
3420             // meaning that we get a new StyleCustomFilterProgram here that is not yet in the cache, but already has loaded StyleShaders.