/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * the container for the style sheets that apply to a presentation, and * the internal API that the style system exposes for creating (and * potentially re-creating) style contexts */ #include "nsStyleSet.h" #include "mozilla/ArrayUtils.h" #include "mozilla/CSSStyleSheet.h" #include "mozilla/EnumeratedRange.h" #include "mozilla/EventStates.h" #include "mozilla/MemoryReporting.h" #include "mozilla/RuleProcessorCache.h" #include "nsIDocumentInlines.h" #include "nsRuleWalker.h" #include "nsStyleContext.h" #include "mozilla/css/StyleRule.h" #include "nsCSSAnonBoxes.h" #include "nsCSSPseudoElements.h" #include "nsCSSRuleProcessor.h" #include "nsDataHashtable.h" #include "nsIContent.h" #include "nsRuleData.h" #include "nsRuleProcessorData.h" #include "nsTransitionManager.h" #include "nsAnimationManager.h" #include "nsStyleSheetService.h" #include "mozilla/dom/Element.h" #include "GeckoProfiler.h" #include "nsHTMLCSSStyleSheet.h" #include "nsHTMLStyleSheet.h" #include "SVGAttrAnimationRuleProcessor.h" #include "nsCSSRules.h" #include "nsPrintfCString.h" #include "nsIFrame.h" #include "RestyleManager.h" #include "nsQueryObject.h" #include using namespace mozilla; using namespace mozilla::dom; NS_IMPL_ISUPPORTS(nsEmptyStyleRule, nsIStyleRule) /* virtual */ void nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { } /* virtual */ bool nsEmptyStyleRule::MightMapInheritedStyleData() { return false; } #ifdef DEBUG /* virtual */ void nsEmptyStyleRule::List(FILE* out, int32_t aIndent) const { nsAutoCString indentStr; for (int32_t index = aIndent; --index >= 0; ) { indentStr.AppendLiteral(" "); } fprintf_stderr(out, "%s[empty style rule] {}\n", indentStr.get()); } #endif NS_IMPL_ISUPPORTS(nsInitialStyleRule, nsIStyleRule) /* virtual */ void nsInitialStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { // Iterate over the property groups for (nsStyleStructID sid = nsStyleStructID(0); sid < nsStyleStructID_Length; sid = nsStyleStructID(sid + 1)) { if (aRuleData->mSIDs & (1 << sid)) { // Iterate over nsCSSValues within the property group nsCSSValue * const value_start = aRuleData->mValueStorage + aRuleData->mValueOffsets[sid]; for (nsCSSValue *value = value_start, *value_end = value + nsCSSProps::PropertyCountInStruct(sid); value != value_end; ++value) { // If MathML is disabled take care not to set MathML properties (or we // will trigger assertions in nsRuleNode) if (sid == eStyleStruct_Font && !aRuleData->mPresContext->Document()->GetMathMLEnabled()) { size_t index = value - value_start; if (index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_level) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_size_multiplier) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_min_size) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_math_variant) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_math_display)) { continue; } } if (value->GetUnit() == eCSSUnit_Null) { value->SetInitialValue(); } } } } } /* virtual */ bool nsInitialStyleRule::MightMapInheritedStyleData() { return true; } #ifdef DEBUG /* virtual */ void nsInitialStyleRule::List(FILE* out, int32_t aIndent) const { nsAutoCString indentStr; for (int32_t index = aIndent; --index >= 0; ) { indentStr.AppendLiteral(" "); } fprintf_stderr(out, "%s[initial style rule] {}\n", indentStr.get()); } #endif NS_IMPL_ISUPPORTS(nsDisableTextZoomStyleRule, nsIStyleRule) /* virtual */ void nsDisableTextZoomStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { if (!(aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Font))) return; nsCSSValue* value = aRuleData->ValueForTextZoom(); if (value->GetUnit() == eCSSUnit_Null) value->SetNoneValue(); } /* virtual */ bool nsDisableTextZoomStyleRule::MightMapInheritedStyleData() { return true; } #ifdef DEBUG /* virtual */ void nsDisableTextZoomStyleRule::List(FILE* out, int32_t aIndent) const { nsAutoCString indentStr; for (int32_t index = aIndent; --index >= 0; ) { indentStr.AppendLiteral(" "); } fprintf_stderr(out, "%s[disable text zoom style rule] {}\n", indentStr.get()); } #endif static const SheetType gCSSSheetTypes[] = { // From lowest to highest in cascading order. SheetType::Agent, SheetType::User, SheetType::Doc, SheetType::ScopedDoc, SheetType::Override }; static bool IsCSSSheetType(SheetType aSheetType) { for (SheetType type : gCSSSheetTypes) { if (type == aSheetType) { return true; } } return false; } nsStyleSet::nsStyleSet() : mRuleTree(nullptr), mBatching(0), mInShutdown(false), mAuthorStyleDisabled(false), mInReconstruct(false), mInitFontFeatureValuesLookup(true), mNeedsRestyleAfterEnsureUniqueInner(false), mDirty(0), mUnusedRuleNodeCount(0) { } nsStyleSet::~nsStyleSet() { for (SheetType type : gCSSSheetTypes) { for (CSSStyleSheet* sheet : mSheets[type]) { sheet->DropStyleSet(this); } } // drop reference to cached rule processors nsCSSRuleProcessor* rp; rp = static_cast(mRuleProcessors[SheetType::Agent].get()); if (rp) { MOZ_ASSERT(rp->IsShared()); rp->ReleaseStyleSetRef(); } rp = static_cast(mRuleProcessors[SheetType::User].get()); if (rp) { MOZ_ASSERT(rp->IsShared()); rp->ReleaseStyleSetRef(); } } size_t nsStyleSet::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const { size_t n = aMallocSizeOf(this); for (SheetType type : MakeEnumeratedRange(SheetType::Count)) { if (mRuleProcessors[type]) { bool shared = false; if (type == SheetType::Agent || type == SheetType::User) { // The only two origins we consider caching rule processors for. nsCSSRuleProcessor* rp = static_cast(mRuleProcessors[type].get()); shared = rp->IsShared(); } if (!shared) { n += mRuleProcessors[type]->SizeOfIncludingThis(aMallocSizeOf); } } // We don't own the sheets (either the nsLayoutStyleSheetCache singleton // or our document owns them). n += mSheets[type].ShallowSizeOfExcludingThis(aMallocSizeOf); } for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) { n += mScopedDocSheetRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf); } n += mScopedDocSheetRuleProcessors.ShallowSizeOfExcludingThis(aMallocSizeOf); n += mRoots.ShallowSizeOfExcludingThis(aMallocSizeOf); n += mOldRuleTrees.ShallowSizeOfExcludingThis(aMallocSizeOf); return n; } void nsStyleSet::Init(nsPresContext *aPresContext) { mFirstLineRule = new nsEmptyStyleRule; mFirstLetterRule = new nsEmptyStyleRule; mPlaceholderRule = new nsEmptyStyleRule; mDisableTextZoomStyleRule = new nsDisableTextZoomStyleRule; mRuleTree = nsRuleNode::CreateRootNode(aPresContext); // Make an explicit GatherRuleProcessors call for the levels that // don't have style sheets. The other levels will have their calls // triggered by DirtyRuleProcessors. GatherRuleProcessors(SheetType::PresHint); GatherRuleProcessors(SheetType::SVGAttrAnimation); GatherRuleProcessors(SheetType::StyleAttr); GatherRuleProcessors(SheetType::Animation); GatherRuleProcessors(SheetType::Transition); } nsresult nsStyleSet::BeginReconstruct() { NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?"); NS_ASSERTION(mRuleTree, "Reconstructing before first construction?"); // Clear any ArenaRefPtr-managed style contexts, as we don't want them // held on to after the rule tree has been reconstructed. PresContext()->PresShell()->ClearArenaRefPtrs(eArenaObjectID_nsStyleContext); // Create a new rule tree root nsRuleNode* newTree = nsRuleNode::CreateRootNode(mRuleTree->PresContext()); // Save the old rule tree so we can destroy it later if (!mOldRuleTrees.AppendElement(mRuleTree)) { newTree->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } // We need to keep mRoots so that the rule tree GC will only free the // rule trees that really aren't referenced anymore (which should be // all of them, if there are no bugs in reresolution code). mInReconstruct = true; mRuleTree = newTree; return NS_OK; } void nsStyleSet::EndReconstruct() { NS_ASSERTION(mInReconstruct, "Unmatched begin/end?"); mInReconstruct = false; #ifdef DEBUG for (int32_t i = mRoots.Length() - 1; i >= 0; --i) { // Since nsStyleContext's mParent and mRuleNode are immutable, and // style contexts own their parents, and nsStyleContext asserts in // its constructor that the style context and its parent are in the // same rule tree, we don't need to check any of the children of // mRoots; we only need to check the rule nodes of mRoots // themselves. NS_ASSERTION(mRoots[i]->RuleNode()->RuleTree() == mRuleTree, "style context has old rule node"); } #endif // This *should* destroy the only element of mOldRuleTrees, but in // case of some bugs (which would trigger the above assertions), it // won't. GCRuleTrees(); } typedef nsDataHashtable, uint32_t> ScopeDepthCache; // Returns the depth of a style scope element, with 1 being the depth of // a style scope element that has no ancestor style scope elements. The // depth does not count intervening non-scope elements. static uint32_t GetScopeDepth(nsINode* aScopeElement, ScopeDepthCache& aCache) { nsINode* parent = aScopeElement->GetParent(); if (!parent || !parent->IsElementInStyleScope()) { return 1; } uint32_t depth = aCache.Get(aScopeElement); if (!depth) { for (nsINode* n = parent; n; n = n->GetParent()) { if (n->IsScopedStyleRoot()) { depth = GetScopeDepth(n, aCache) + 1; aCache.Put(aScopeElement, depth); break; } } } return depth; } struct ScopedSheetOrder { CSSStyleSheet* mSheet; uint32_t mDepth; uint32_t mOrder; bool operator==(const ScopedSheetOrder& aRHS) const { return mDepth == aRHS.mDepth && mOrder == aRHS.mOrder; } bool operator<(const ScopedSheetOrder& aRHS) const { if (mDepth != aRHS.mDepth) { return mDepth < aRHS.mDepth; } return mOrder < aRHS.mOrder; } }; // Sorts aSheets such that style sheets for ancestor scopes come // before those for descendant scopes, and with sheets for a single // scope in document order. static void SortStyleSheetsByScope(nsTArray& aSheets) { uint32_t n = aSheets.Length(); if (n == 1) { return; } ScopeDepthCache cache; nsTArray sheets; sheets.SetLength(n); // For each sheet, record the depth of its scope element and its original // document order. for (uint32_t i = 0; i < n; i++) { sheets[i].mSheet = aSheets[i]; sheets[i].mDepth = GetScopeDepth(aSheets[i]->GetScopeElement(), cache); sheets[i].mOrder = i; } // Sort by depth first, then document order. sheets.Sort(); for (uint32_t i = 0; i < n; i++) { aSheets[i] = sheets[i].mSheet; } } nsresult nsStyleSet::GatherRuleProcessors(SheetType aType) { NS_ENSURE_FALSE(mInShutdown, NS_ERROR_FAILURE); // We might be in GatherRuleProcessors because we are dropping a sheet, // resulting in an nsCSSSelector being destroyed. Tell the // RestyleManager for each document we're used in so that they can // drop any nsCSSSelector pointers (used for eRestyle_SomeDescendants) // in their mPendingRestyles. if (IsCSSSheetType(aType)) { ClearSelectors(); } nsCOMPtr oldRuleProcessor(mRuleProcessors[aType]); nsTArray> oldScopedDocRuleProcessors; if (aType == SheetType::Agent || aType == SheetType::User) { // drop reference to cached rule processor nsCSSRuleProcessor* rp = static_cast(mRuleProcessors[aType].get()); if (rp) { MOZ_ASSERT(rp->IsShared()); rp->ReleaseStyleSetRef(); } } mRuleProcessors[aType] = nullptr; if (aType == SheetType::ScopedDoc) { for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) { nsIStyleRuleProcessor* processor = mScopedDocSheetRuleProcessors[i].get(); Element* scope = static_cast(processor)->GetScopeElement(); scope->ClearIsScopedStyleRoot(); } // Clear mScopedDocSheetRuleProcessors, but save it. oldScopedDocRuleProcessors.SwapElements(mScopedDocSheetRuleProcessors); } if (mAuthorStyleDisabled && (aType == SheetType::Doc || aType == SheetType::ScopedDoc || aType == SheetType::StyleAttr)) { // Don't regather if this level is disabled. Note that we gather // preshint sheets no matter what, but then skip them for some // elements later if mAuthorStyleDisabled. return NS_OK; } switch (aType) { // levels that do not contain CSS style sheets case SheetType::Animation: MOZ_ASSERT(mSheets[aType].IsEmpty()); mRuleProcessors[aType] = PresContext()->AnimationManager(); return NS_OK; case SheetType::Transition: MOZ_ASSERT(mSheets[aType].IsEmpty()); mRuleProcessors[aType] = PresContext()->TransitionManager(); return NS_OK; case SheetType::StyleAttr: MOZ_ASSERT(mSheets[aType].IsEmpty()); mRuleProcessors[aType] = PresContext()->Document()->GetInlineStyleSheet(); return NS_OK; case SheetType::PresHint: MOZ_ASSERT(mSheets[aType].IsEmpty()); mRuleProcessors[aType] = PresContext()->Document()->GetAttributeStyleSheet(); return NS_OK; case SheetType::SVGAttrAnimation: MOZ_ASSERT(mSheets[aType].IsEmpty()); mRuleProcessors[aType] = PresContext()->Document()->GetSVGAttrAnimationRuleProcessor(); return NS_OK; default: // keep going break; } MOZ_ASSERT(IsCSSSheetType(aType)); if (aType == SheetType::ScopedDoc) { // Create a rule processor for each scope. uint32_t count = mSheets[SheetType::ScopedDoc].Length(); if (count) { // Gather the scoped style sheets into an array as // CSSStyleSheets, and mark all of their scope elements // as scoped style roots. nsTArray sheets(count); for (CSSStyleSheet* sheet : mSheets[SheetType::ScopedDoc]) { sheets.AppendElement(sheet); Element* scope = sheet->GetScopeElement(); scope->SetIsScopedStyleRoot(); } // Sort the scoped style sheets so that those for the same scope are // adjacent and that ancestor scopes come before descendent scopes. SortStyleSheetsByScope(sheets); // Put the old scoped rule processors in a hashtable so that we // can retrieve them efficiently, even in edge cases like the // simultaneous removal and addition of a large number of elements // with scoped sheets. nsDataHashtable, nsCSSRuleProcessor*> oldScopedRuleProcessorHash; for (size_t i = oldScopedDocRuleProcessors.Length(); i-- != 0; ) { nsCSSRuleProcessor* oldRP = static_cast(oldScopedDocRuleProcessors[i].get()); Element* scope = oldRP->GetScopeElement(); MOZ_ASSERT(!oldScopedRuleProcessorHash.Get(scope), "duplicate rule processors for same scope element?"); oldScopedRuleProcessorHash.Put(scope, oldRP); } uint32_t start = 0, end; do { // Find the range of style sheets with the same scope. Element* scope = sheets[start]->GetScopeElement(); end = start + 1; while (end < count && sheets[end]->GetScopeElement() == scope) { end++; } scope->SetIsScopedStyleRoot(); // Create a rule processor for the scope. nsTArray> sheetsForScope; sheetsForScope.AppendElements(sheets.Elements() + start, end - start); nsCSSRuleProcessor* oldRP = oldScopedRuleProcessorHash.Get(scope); mScopedDocSheetRuleProcessors.AppendElement (new nsCSSRuleProcessor(sheetsForScope, aType, scope, oldRP)); start = end; } while (start < count); } return NS_OK; } if (!mSheets[aType].IsEmpty()) { switch (aType) { case SheetType::Agent: case SheetType::User: { // levels containing non-scoped CSS style sheets whose rule processors // we want to re-use nsTArray sheets(mSheets[aType].Length()); for (CSSStyleSheet* sheet : mSheets[aType]) { sheets.AppendElement(sheet); } nsCSSRuleProcessor* rp = RuleProcessorCache::GetRuleProcessor(sheets, PresContext()); if (!rp) { rp = new nsCSSRuleProcessor(mSheets[aType], aType, nullptr, static_cast( oldRuleProcessor.get()), true /* aIsShared */); nsTArray documentRules; nsDocumentRuleResultCacheKey cacheKey; rp->TakeDocumentRulesAndCacheKey(PresContext(), documentRules, cacheKey); RuleProcessorCache::PutRuleProcessor(sheets, Move(documentRules), cacheKey, rp); } mRuleProcessors[aType] = rp; rp->AddStyleSetRef(); break; } case SheetType::Doc: case SheetType::Override: { // levels containing non-scoped CSS stylesheets whose rule processors // we don't want to re-use mRuleProcessors[aType] = new nsCSSRuleProcessor(mSheets[aType], aType, nullptr, static_cast( oldRuleProcessor.get())); } break; default: MOZ_ASSERT_UNREACHABLE("non-CSS sheet types should be handled above"); break; } } return NS_OK; } nsresult nsStyleSet::AppendStyleSheet(SheetType aType, CSSStyleSheet* aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); bool present = mSheets[aType].RemoveElement(aSheet); mSheets[aType].AppendElement(aSheet); if (!present && IsCSSSheetType(aType)) { aSheet->AddStyleSet(this); } return DirtyRuleProcessors(aType); } nsresult nsStyleSet::PrependStyleSheet(SheetType aType, CSSStyleSheet* aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); bool present = mSheets[aType].RemoveElement(aSheet); mSheets[aType].InsertElementAt(0, aSheet); if (!present && IsCSSSheetType(aType)) { aSheet->AddStyleSet(this); } return DirtyRuleProcessors(aType); } nsresult nsStyleSet::RemoveStyleSheet(SheetType aType, CSSStyleSheet* aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsComplete(), "Incomplete sheet being removed from style set"); if (mSheets[aType].RemoveElement(aSheet)) { if (IsCSSSheetType(aType)) { aSheet->DropStyleSet(this); } } return DirtyRuleProcessors(aType); } nsresult nsStyleSet::ReplaceSheets(SheetType aType, const nsTArray>& aNewSheets) { bool cssSheetType = IsCSSSheetType(aType); if (cssSheetType) { for (CSSStyleSheet* sheet : mSheets[aType]) { sheet->DropStyleSet(this); } } mSheets[aType].Clear(); mSheets[aType].AppendElements(aNewSheets); if (cssSheetType) { for (CSSStyleSheet* sheet : mSheets[aType]) { sheet->AddStyleSet(this); } } return DirtyRuleProcessors(aType); } nsresult nsStyleSet::InsertStyleSheetBefore(SheetType aType, CSSStyleSheet* aNewSheet, CSSStyleSheet* aReferenceSheet) { NS_PRECONDITION(aNewSheet && aReferenceSheet, "null arg"); NS_ASSERTION(aNewSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); bool present = mSheets[aType].RemoveElement(aNewSheet); int32_t idx = mSheets[aType].IndexOf(aReferenceSheet); if (idx < 0) return NS_ERROR_INVALID_ARG; mSheets[aType].InsertElementAt(idx, aNewSheet); if (!present && IsCSSSheetType(aType)) { aNewSheet->AddStyleSet(this); } return DirtyRuleProcessors(aType); } static inline uint32_t DirtyBit(SheetType aType) { return 1 << uint32_t(aType); } nsresult nsStyleSet::DirtyRuleProcessors(SheetType aType) { if (!mBatching) return GatherRuleProcessors(aType); mDirty |= DirtyBit(aType); return NS_OK; } bool nsStyleSet::GetAuthorStyleDisabled() { return mAuthorStyleDisabled; } nsresult nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled) { if (aStyleDisabled == !mAuthorStyleDisabled) { mAuthorStyleDisabled = aStyleDisabled; BeginUpdate(); mDirty |= DirtyBit(SheetType::Doc) | DirtyBit(SheetType::ScopedDoc) | DirtyBit(SheetType::StyleAttr); return EndUpdate(); } return NS_OK; } // -------- Doc Sheets nsresult nsStyleSet::AddDocStyleSheet(CSSStyleSheet* aSheet, nsIDocument* aDocument) { NS_PRECONDITION(aSheet && aDocument, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); SheetType type = aSheet->GetScopeElement() ? SheetType::ScopedDoc : SheetType::Doc; nsTArray>& sheets = mSheets[type]; bool present = sheets.RemoveElement(aSheet); nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance(); // lowest index first int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet); int32_t count = sheets.Length(); int32_t index; for (index = 0; index < count; index++) { CSSStyleSheet* sheet = sheets[index]; int32_t sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet); if (sheetDocIndex > newDocIndex) break; // If the sheet is not owned by the document it can be an author // sheet registered at nsStyleSheetService or an additional author // sheet on the document, which means the new // doc sheet should end up before it. if (sheetDocIndex < 0) { if (sheetService) { auto& authorSheets = *sheetService->AuthorStyleSheets(); if (authorSheets.IndexOf(sheet) != authorSheets.NoIndex) { break; } } if (sheet == aDocument->FirstAdditionalAuthorSheet()) { break; } } } sheets.InsertElementAt(index, aSheet); if (!present) { aSheet->AddStyleSet(this); } return DirtyRuleProcessors(type); } nsresult nsStyleSet::RemoveDocStyleSheet(CSSStyleSheet* aSheet) { bool isScoped = aSheet->GetScopeElement(); return RemoveStyleSheet(isScoped ? SheetType::ScopedDoc : SheetType::Doc, aSheet); } // Batching void nsStyleSet::BeginUpdate() { ++mBatching; } nsresult nsStyleSet::EndUpdate() { NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate"); if (--mBatching) { // We're not completely done yet. return NS_OK; } for (SheetType type : MakeEnumeratedRange(SheetType::Count)) { if (mDirty & DirtyBit(type)) { nsresult rv = GatherRuleProcessors(type); NS_ENSURE_SUCCESS(rv, rv); } } mDirty = 0; return NS_OK; } template static bool EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData) { T* data = static_cast(aData); aProcessor->RulesMatching(data); return true; } static inline bool IsMoreSpecificThanAnimation(nsRuleNode *aRuleNode) { return !aRuleNode->IsRoot() && (aRuleNode->GetLevel() == SheetType::Transition || aRuleNode->IsImportantRule()); } static nsIStyleRule* GetAnimationRule(nsRuleNode *aRuleNode) { nsRuleNode *n = aRuleNode; while (IsMoreSpecificThanAnimation(n)) { n = n->GetParent(); } if (n->IsRoot() || n->GetLevel() != SheetType::Animation) { return nullptr; } return n->GetRule(); } static nsRuleNode* ReplaceAnimationRule(nsRuleNode *aOldRuleNode, nsIStyleRule *aOldAnimRule, nsIStyleRule *aNewAnimRule) { nsTArray moreSpecificNodes; nsRuleNode *n = aOldRuleNode; while (IsMoreSpecificThanAnimation(n)) { moreSpecificNodes.AppendElement(n); n = n->GetParent(); } if (aOldAnimRule) { MOZ_ASSERT(n->GetRule() == aOldAnimRule, "wrong rule"); MOZ_ASSERT(n->GetLevel() == SheetType::Animation, "wrong level"); n = n->GetParent(); } MOZ_ASSERT(!IsMoreSpecificThanAnimation(n) && (n->IsRoot() || n->GetLevel() != SheetType::Animation), "wrong level"); if (aNewAnimRule) { n = n->Transition(aNewAnimRule, SheetType::Animation, false); n->SetIsAnimationRule(); } for (uint32_t i = moreSpecificNodes.Length(); i-- != 0; ) { nsRuleNode *oldNode = moreSpecificNodes[i]; n = n->Transition(oldNode->GetRule(), oldNode->GetLevel(), oldNode->IsImportantRule()); } return n; } /** * |GetContext| implements sharing of style contexts (not just the data * on the rule nodes) between siblings and cousins of the same * generation. (It works for cousins of the same generation since * |aParentContext| could itself be a shared context.) */ already_AddRefed nsStyleSet::GetContext(nsStyleContext* aParentContext, nsRuleNode* aRuleNode, // aVisitedRuleNode may be null; if it is null // it means that we don't need to force creation // of a StyleIfVisited. (But if we make one // because aParentContext has one, then aRuleNode // should be used.) nsRuleNode* aVisitedRuleNode, nsIAtom* aPseudoTag, nsCSSPseudoElements::Type aPseudoType, Element* aElementForAnimation, uint32_t aFlags) { NS_PRECONDITION((!aPseudoTag && aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) || (aPseudoTag && nsCSSPseudoElements::GetPseudoType(aPseudoTag) == aPseudoType), "Pseudo mismatch"); if (aVisitedRuleNode == aRuleNode) { // No need to force creation of a visited style in this case. aVisitedRuleNode = nullptr; } // Ensure |aVisitedRuleNode != nullptr| corresponds to the need to // create an if-visited style context, and that in that case, we have // parentIfVisited set correctly. nsStyleContext *parentIfVisited = aParentContext ? aParentContext->GetStyleIfVisited() : nullptr; if (parentIfVisited) { if (!aVisitedRuleNode) { aVisitedRuleNode = aRuleNode; } } else { if (aVisitedRuleNode) { parentIfVisited = aParentContext; } } if (aFlags & eIsLink) { // If this node is a link, we want its visited's style context's // parent to be the regular style context of its parent, because // only the visitedness of the relevant link should influence style. parentIfVisited = aParentContext; } bool relevantLinkVisited = (aFlags & eIsLink) ? (aFlags & eIsVisitedLink) : (aParentContext && aParentContext->RelevantLinkVisited()); RefPtr result; if (aParentContext) result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode, aVisitedRuleNode, relevantLinkVisited); #ifdef NOISY_DEBUG if (result) fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount); else fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount); #endif if (!result) { result = NS_NewStyleContext(aParentContext, aPseudoTag, aPseudoType, aRuleNode, aFlags & eSkipParentDisplayBasedStyleFixup); if (aVisitedRuleNode) { RefPtr resultIfVisited = NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType, aVisitedRuleNode, aFlags & eSkipParentDisplayBasedStyleFixup); if (!parentIfVisited) { mRoots.AppendElement(resultIfVisited); } resultIfVisited->SetIsStyleIfVisited(); result->SetStyleIfVisited(resultIfVisited.forget()); if (relevantLinkVisited) { result->AddStyleBit(NS_STYLE_RELEVANT_LINK_VISITED); } } if (!aParentContext) { mRoots.AppendElement(result); } } else { NS_ASSERTION(result->GetPseudoType() == aPseudoType, "Unexpected type"); NS_ASSERTION(result->GetPseudo() == aPseudoTag, "Unexpected pseudo"); } if (aFlags & eDoAnimation) { // Normally the animation manager has already added the correct // style rule. However, if the animation-name just changed, it // might have been wrong. So ask it to double-check based on the // resulting style context. nsIStyleRule *oldAnimRule = GetAnimationRule(aRuleNode); nsIStyleRule *animRule = PresContext()->AnimationManager()-> CheckAnimationRule(result, aElementForAnimation); MOZ_ASSERT(result->RuleNode() == aRuleNode, "unexpected rule node"); MOZ_ASSERT(!result->GetStyleIfVisited() == !aVisitedRuleNode, "unexpected visited rule node"); MOZ_ASSERT(!aVisitedRuleNode || result->GetStyleIfVisited()->RuleNode() == aVisitedRuleNode, "unexpected visited rule node"); MOZ_ASSERT(!aVisitedRuleNode || oldAnimRule == GetAnimationRule(aVisitedRuleNode), "animation rule mismatch between rule nodes"); if (oldAnimRule != animRule) { nsRuleNode *ruleNode = ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule); nsRuleNode *visitedRuleNode = aVisitedRuleNode ? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule) : nullptr; MOZ_ASSERT(!visitedRuleNode || GetAnimationRule(ruleNode) == GetAnimationRule(visitedRuleNode), "animation rule mismatch between rule nodes"); result = GetContext(aParentContext, ruleNode, visitedRuleNode, aPseudoTag, aPseudoType, nullptr, aFlags & ~eDoAnimation); } } if (aElementForAnimation && aElementForAnimation->IsHTMLElement(nsGkAtoms::body) && aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement && PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) { nsIDocument* doc = aElementForAnimation->GetCurrentDoc(); if (doc && doc->GetBodyElement() == aElementForAnimation) { // Update the prescontext's body color PresContext()->SetBodyTextColor(result->StyleColor()->mColor); } } return result.forget(); } void nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode, nsRuleWalker* aRuleWalker) { NS_ASSERTION(aCurrLevelNode && aCurrLevelNode != aLastPrevLevelNode, "How did we get here?"); nsAutoTArray importantRules; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { // We guarantee that we never walk the root node here, so no need // to null-check GetRule(). Furthermore, it must be a CSS rule. NS_ASSERTION(RefPtr(do_QueryObject(node->GetRule())), "Unexpected non-CSS rule"); nsIStyleRule* impRule = static_cast(node->GetRule())->GetImportantStyleData(); if (impRule) importantRules.AppendElement(impRule); } NS_ASSERTION(importantRules.Length() != 0, "Why did we think there were important rules?"); for (uint32_t i = importantRules.Length(); i-- != 0; ) { aRuleWalker->Forward(importantRules[i]); } } #ifdef DEBUG void nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { RefPtr declaration(do_QueryObject(node->GetRule())); NS_ASSERTION(declaration, "Unexpected non-CSS rule"); NS_ASSERTION(!declaration->GetImportantStyleData(), "Unexpected important style source"); } } void nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsIStyleRule *rule = node->GetRule(); RefPtr declaration(do_QueryObject(rule)); if (declaration) { RefPtr cssRule = do_QueryObject(declaration->GetOwningRule()); NS_ASSERTION(!cssRule || !cssRule->Selector(), "Unexpected CSS rule"); } } } #endif // Enumerate the rules in a way that cares about the order of the rules. void nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc, RuleProcessorData* aData, Element* aElement, nsRuleWalker* aRuleWalker) { PROFILER_LABEL("nsStyleSet", "FileRules", js::ProfileEntry::Category::CSS); NS_ASSERTION(mBatching == 0, "rule processors out of date"); // Cascading order: // [least important] // - UA normal rules = Agent normal // - User normal rules = User normal // - Presentation hints = PresHint normal // - SVG Animation (highest pres hint) = SVGAttrAnimation normal // - Author normal rules = Document normal // - Override normal rules = Override normal // - animation rules = Animation normal // - Author !important rules = Document !important // - Override !important rules = Override !important // - User !important rules = User !important // - UA !important rules = Agent !important // - transition rules = Transition normal // [most important] // Save off the last rule before we start walking our agent sheets; // this will be either the root or one of the restriction rules. nsRuleNode* lastRestrictionRN = aRuleWalker->CurrentNode(); aRuleWalker->SetLevel(SheetType::Agent, false, true); if (mRuleProcessors[SheetType::Agent]) (*aCollectorFunc)(mRuleProcessors[SheetType::Agent], aData); nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode(); bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(SheetType::User, false, true); bool skipUserStyles = aElement && aElement->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[SheetType::User]) // NOTE: different (*aCollectorFunc)(mRuleProcessors[SheetType::User], aData); nsRuleNode* lastUserRN = aRuleWalker->CurrentNode(); bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(SheetType::PresHint, false, false); if (mRuleProcessors[SheetType::PresHint]) (*aCollectorFunc)(mRuleProcessors[SheetType::PresHint], aData); aRuleWalker->SetLevel(SheetType::SVGAttrAnimation, false, false); if (mRuleProcessors[SheetType::SVGAttrAnimation]) (*aCollectorFunc)(mRuleProcessors[SheetType::SVGAttrAnimation], aData); nsRuleNode* lastSVGAttrAnimationRN = aRuleWalker->CurrentNode(); aRuleWalker->SetLevel(SheetType::Doc, false, true); bool cutOffInheritance = false; if (mBindingManager && aElement) { // We can supply additional document-level sheets that should be walked. mBindingManager->WalkRules(aCollectorFunc, static_cast(aData), &cutOffInheritance); } if (!skipUserStyles && !cutOffInheritance && // NOTE: different mRuleProcessors[SheetType::Doc]) (*aCollectorFunc)(mRuleProcessors[SheetType::Doc], aData); nsRuleNode* lastDocRN = aRuleWalker->CurrentNode(); bool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules(); nsTArray lastScopedRNs; nsTArray haveImportantScopedRules; bool haveAnyImportantScopedRules = false; if (!skipUserStyles && !cutOffInheritance && aElement && aElement->IsElementInStyleScope()) { lastScopedRNs.SetLength(mScopedDocSheetRuleProcessors.Length()); haveImportantScopedRules.SetLength(mScopedDocSheetRuleProcessors.Length()); for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) { aRuleWalker->SetLevel(SheetType::ScopedDoc, false, true); nsCSSRuleProcessor* processor = static_cast(mScopedDocSheetRuleProcessors[i].get()); aData->mScope = processor->GetScopeElement(); (*aCollectorFunc)(mScopedDocSheetRuleProcessors[i], aData); lastScopedRNs[i] = aRuleWalker->CurrentNode(); haveImportantScopedRules[i] = !aRuleWalker->GetCheckForImportantRules(); haveAnyImportantScopedRules = haveAnyImportantScopedRules || haveImportantScopedRules[i]; } aData->mScope = nullptr; } nsRuleNode* lastScopedRN = aRuleWalker->CurrentNode(); aRuleWalker->SetLevel(SheetType::StyleAttr, false, true); if (mRuleProcessors[SheetType::StyleAttr]) (*aCollectorFunc)(mRuleProcessors[SheetType::StyleAttr], aData); nsRuleNode* lastStyleAttrRN = aRuleWalker->CurrentNode(); bool haveImportantStyleAttrRules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(SheetType::Override, false, true); if (mRuleProcessors[SheetType::Override]) (*aCollectorFunc)(mRuleProcessors[SheetType::Override], aData); nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode(); bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules(); // This needs to match IsMoreSpecificThanAnimation() above. aRuleWalker->SetLevel(SheetType::Animation, false, false); (*aCollectorFunc)(mRuleProcessors[SheetType::Animation], aData); if (haveAnyImportantScopedRules) { for (uint32_t i = lastScopedRNs.Length(); i-- != 0; ) { aRuleWalker->SetLevel(SheetType::ScopedDoc, true, false); nsRuleNode* startRN = lastScopedRNs[i]; nsRuleNode* endRN = i == 0 ? lastDocRN : lastScopedRNs[i - 1]; if (haveImportantScopedRules[i]) { AddImportantRules(startRN, endRN, aRuleWalker); // scoped } #ifdef DEBUG else { AssertNoImportantRules(startRN, endRN); } #endif } } #ifdef DEBUG else { AssertNoImportantRules(lastScopedRN, lastDocRN); } #endif if (haveImportantDocRules) { aRuleWalker->SetLevel(SheetType::Doc, true, false); AddImportantRules(lastDocRN, lastSVGAttrAnimationRN, aRuleWalker); // doc } #ifdef DEBUG else { AssertNoImportantRules(lastDocRN, lastSVGAttrAnimationRN); } #endif if (haveImportantStyleAttrRules) { aRuleWalker->SetLevel(SheetType::StyleAttr, true, false); AddImportantRules(lastStyleAttrRN, lastScopedRN, aRuleWalker); // style attr } #ifdef DEBUG else { AssertNoImportantRules(lastStyleAttrRN, lastScopedRN); } #endif if (haveImportantOverrideRules) { aRuleWalker->SetLevel(SheetType::Override, true, false); AddImportantRules(lastOvrRN, lastStyleAttrRN, aRuleWalker); // override } #ifdef DEBUG else { AssertNoImportantRules(lastOvrRN, lastStyleAttrRN); } #endif #ifdef DEBUG AssertNoCSSRules(lastSVGAttrAnimationRN, lastUserRN); #endif if (haveImportantUserRules) { aRuleWalker->SetLevel(SheetType::User, true, false); AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user } #ifdef DEBUG else { AssertNoImportantRules(lastUserRN, lastAgentRN); } #endif if (haveImportantUARules) { aRuleWalker->SetLevel(SheetType::Agent, true, false); AddImportantRules(lastAgentRN, lastRestrictionRN, aRuleWalker); //agent } #ifdef DEBUG else { AssertNoImportantRules(lastAgentRN, lastRestrictionRN); } #endif #ifdef DEBUG AssertNoCSSRules(lastRestrictionRN, mRuleTree); #endif #ifdef DEBUG nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode(); #endif aRuleWalker->SetLevel(SheetType::Transition, false, false); (*aCollectorFunc)(mRuleProcessors[SheetType::Transition], aData); #ifdef DEBUG AssertNoCSSRules(aRuleWalker->CurrentNode(), lastImportantRN); #endif } // Enumerate all the rules in a way that doesn't care about the order // of the rules and doesn't walk !important-rules. void nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc, ElementDependentRuleProcessorData* aData, bool aWalkAllXBLStylesheets) { NS_ASSERTION(mBatching == 0, "rule processors out of date"); if (mRuleProcessors[SheetType::Agent]) (*aFunc)(mRuleProcessors[SheetType::Agent], aData); bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[SheetType::User]) // NOTE: different (*aFunc)(mRuleProcessors[SheetType::User], aData); if (mRuleProcessors[SheetType::PresHint]) (*aFunc)(mRuleProcessors[SheetType::PresHint], aData); if (mRuleProcessors[SheetType::SVGAttrAnimation]) (*aFunc)(mRuleProcessors[SheetType::SVGAttrAnimation], aData); bool cutOffInheritance = false; if (mBindingManager) { // We can supply additional document-level sheets that should be walked. if (aWalkAllXBLStylesheets) { mBindingManager->WalkAllRules(aFunc, aData); } else { mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance); } } if (!skipUserStyles && !cutOffInheritance) { if (mRuleProcessors[SheetType::Doc]) // NOTE: different (*aFunc)(mRuleProcessors[SheetType::Doc], aData); if (aData->mElement->IsElementInStyleScope()) { for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) (*aFunc)(mScopedDocSheetRuleProcessors[i], aData); } } if (mRuleProcessors[SheetType::StyleAttr]) (*aFunc)(mRuleProcessors[SheetType::StyleAttr], aData); if (mRuleProcessors[SheetType::Override]) (*aFunc)(mRuleProcessors[SheetType::Override], aData); (*aFunc)(mRuleProcessors[SheetType::Animation], aData); (*aFunc)(mRuleProcessors[SheetType::Transition], aData); } static void InitStyleScopes(TreeMatchContext& aTreeContext, Element* aElement) { if (aElement->IsElementInStyleScope()) { aTreeContext.InitStyleScopes(aElement->GetParentElementCrossingShadowRoot()); } } already_AddRefed nsStyleSet::ResolveStyleFor(Element* aElement, nsStyleContext* aParentContext) { TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aElement->OwnerDoc()); InitStyleScopes(treeContext, aElement); return ResolveStyleFor(aElement, aParentContext, treeContext); } already_AddRefed nsStyleSet::ResolveStyleFor(Element* aElement, nsStyleContext* aParentContext, TreeMatchContext& aTreeMatchContext) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aElement, "aElement must not be null"); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); aTreeMatchContext.ResetForUnvisitedMatching(); ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker, aTreeMatchContext); WalkDisableTextZoomRule(aElement, &ruleWalker); FileRules(EnumRulesMatching, &data, aElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (aTreeMatchContext.HaveRelevantLink()) { aTreeMatchContext.ResetForVisitedMatching(); ruleWalker.Reset(); FileRules(EnumRulesMatching, &data, aElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } uint32_t flags = eDoAnimation; if (nsCSSRuleProcessor::IsLink(aElement)) { flags |= eIsLink; } if (nsCSSRuleProcessor::GetContentState(aElement, aTreeMatchContext). HasState(NS_EVENT_STATE_VISITED)) { flags |= eIsVisitedLink; } if (aTreeMatchContext.mSkippingParentDisplayBasedStyleFixup) { flags |= eSkipParentDisplayBasedStyleFixup; } return GetContext(aParentContext, ruleNode, visitedRuleNode, nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement, aElement, flags); } already_AddRefed nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext, const nsTArray< nsCOMPtr > &aRules) { NS_ENSURE_FALSE(mInShutdown, nullptr); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); // FIXME: Perhaps this should be passed in, but it probably doesn't // matter. ruleWalker.SetLevel(SheetType::Doc, false, false); for (uint32_t i = 0; i < aRules.Length(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ElementAt(i)); } return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr, nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement, nullptr, eNoFlags); } already_AddRefed nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext, const nsCOMArray &aRules) { NS_ENSURE_FALSE(mInShutdown, nullptr); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); ruleWalker.SetCurrentNode(aBaseContext->RuleNode()); // This needs to be the transition sheet because that is the highest // level of the cascade, and thus the only thing that makes sense if // we are ever going to call ResolveStyleWithReplacement on the // resulting context. It's also the right thing for the one case (the // transition manager's cover rule) where we put the result of this // function in the style context tree. ruleWalker.SetLevel(SheetType::Transition, false, false); for (int32_t i = 0; i < aRules.Count(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i)); } nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (aBaseContext->GetStyleIfVisited()) { ruleWalker.SetCurrentNode(aBaseContext->GetStyleIfVisited()->RuleNode()); for (int32_t i = 0; i < aRules.Count(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i)); } visitedRuleNode = ruleWalker.CurrentNode(); } uint32_t flags = eNoFlags; if (aBaseContext->IsLinkContext()) { flags |= eIsLink; // GetContext handles propagating RelevantLinkVisited state from the // parent in non-link cases; all we need to pass in is if this link // is visited. if (aBaseContext->RelevantLinkVisited()) { flags |= eIsVisitedLink; } } return GetContext(aBaseContext->GetParent(), ruleNode, visitedRuleNode, aBaseContext->GetPseudo(), aBaseContext->GetPseudoType(), nullptr, flags); } struct RuleNodeInfo { nsIStyleRule* mRule; SheetType mLevel; bool mIsImportant; bool mIsAnimationRule; }; struct CascadeLevel { SheetType mLevel; bool mIsImportant; bool mCheckForImportantRules; nsRestyleHint mLevelReplacementHint; }; static const CascadeLevel gCascadeLevels[] = { { SheetType::Agent, false, false, nsRestyleHint(0) }, { SheetType::User, false, false, nsRestyleHint(0) }, { SheetType::PresHint, false, false, nsRestyleHint(0) }, { SheetType::SVGAttrAnimation, false, false, eRestyle_SVGAttrAnimations }, { SheetType::Doc, false, false, nsRestyleHint(0) }, { SheetType::ScopedDoc, false, false, nsRestyleHint(0) }, { SheetType::StyleAttr, false, true, eRestyle_StyleAttribute | eRestyle_StyleAttribute_Animations }, { SheetType::Override, false, false, nsRestyleHint(0) }, { SheetType::Animation, false, false, eRestyle_CSSAnimations }, { SheetType::ScopedDoc, true, false, nsRestyleHint(0) }, { SheetType::Doc, true, false, nsRestyleHint(0) }, { SheetType::StyleAttr, true, false, eRestyle_StyleAttribute | eRestyle_StyleAttribute_Animations }, { SheetType::Override, true, false, nsRestyleHint(0) }, { SheetType::User, true, false, nsRestyleHint(0) }, { SheetType::Agent, true, false, nsRestyleHint(0) }, { SheetType::Transition, false, false, eRestyle_CSSTransitions }, }; nsRuleNode* nsStyleSet::RuleNodeWithReplacement(Element* aElement, Element* aPseudoElement, nsRuleNode* aOldRuleNode, nsCSSPseudoElements::Type aPseudoType, nsRestyleHint aReplacements) { NS_ASSERTION(mBatching == 0, "rule processors out of date"); MOZ_ASSERT(!aPseudoElement == (aPseudoType >= nsCSSPseudoElements::ePseudo_PseudoElementCount || !(nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(aPseudoType) || nsCSSPseudoElements::PseudoElementSupportsUserActionState(aPseudoType))), "should have aPseudoElement only for certain pseudo elements"); MOZ_ASSERT(!(aReplacements & ~(eRestyle_CSSTransitions | eRestyle_CSSAnimations | eRestyle_SVGAttrAnimations | eRestyle_StyleAttribute | eRestyle_StyleAttribute_Animations | eRestyle_Force | eRestyle_ForceDescendants)), "unexpected replacement bits"); // FIXME (perf): This should probably not rebuild the whole path, but // only the path from the last change in the rule tree, like // ReplaceAnimationRule in nsStyleSet.cpp does. (That could then // perhaps share this code, too?) // But if we do that, we'll need to pass whether we are rebuilding the // rule tree from ElementRestyler::RestyleSelf to avoid taking that // path when we're rebuilding the rule tree. nsTArray rules; for (nsRuleNode* ruleNode = aOldRuleNode; !ruleNode->IsRoot(); ruleNode = ruleNode->GetParent()) { RuleNodeInfo* curRule = rules.AppendElement(); curRule->mRule = ruleNode->GetRule(); curRule->mLevel = ruleNode->GetLevel(); curRule->mIsImportant = ruleNode->IsImportantRule(); curRule->mIsAnimationRule = ruleNode->IsAnimationRule(); } nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); auto rulesIndex = rules.Length(); // We need to transfer this information between the non-!important and // !important phases for the style attribute level. nsRuleNode* lastScopedRN = nullptr; nsRuleNode* lastStyleAttrRN = nullptr; bool haveImportantStyleAttrRules = false; for (const CascadeLevel *level = gCascadeLevels, *levelEnd = ArrayEnd(gCascadeLevels); level != levelEnd; ++level) { bool doReplace = level->mLevelReplacementHint & aReplacements; ruleWalker.SetLevel(level->mLevel, level->mIsImportant, level->mCheckForImportantRules && doReplace); if (doReplace) { switch (level->mLevel) { case SheetType::Animation: { if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || aPseudoType == nsCSSPseudoElements::ePseudo_before || aPseudoType == nsCSSPseudoElements::ePseudo_after) { nsIStyleRule* rule = PresContext()->AnimationManager()-> GetAnimationRule(aElement, aPseudoType); if (rule) { ruleWalker.ForwardOnPossiblyCSSRule(rule); ruleWalker.CurrentNode()->SetIsAnimationRule(); } } break; } case SheetType::Transition: { if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || aPseudoType == nsCSSPseudoElements::ePseudo_before || aPseudoType == nsCSSPseudoElements::ePseudo_after) { nsIStyleRule* rule = PresContext()->TransitionManager()-> GetAnimationRule(aElement, aPseudoType); if (rule) { ruleWalker.ForwardOnPossiblyCSSRule(rule); ruleWalker.CurrentNode()->SetIsAnimationRule(); } } break; } case SheetType::SVGAttrAnimation: { SVGAttrAnimationRuleProcessor* ruleProcessor = static_cast( mRuleProcessors[SheetType::SVGAttrAnimation].get()); if (ruleProcessor && aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) { ruleProcessor->ElementRulesMatching(aElement, &ruleWalker); } break; } case SheetType::StyleAttr: { if (!level->mIsImportant) { // First time through, we handle the non-!important rule. nsHTMLCSSStyleSheet* ruleProcessor = static_cast( mRuleProcessors[SheetType::StyleAttr].get()); if (ruleProcessor) { lastScopedRN = ruleWalker.CurrentNode(); if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) { ruleProcessor->ElementRulesMatching(PresContext(), aElement, &ruleWalker); } else if (aPseudoType < nsCSSPseudoElements::ePseudo_PseudoElementCount && nsCSSPseudoElements:: PseudoElementSupportsStyleAttribute(aPseudoType)) { ruleProcessor->PseudoElementRulesMatching(aPseudoElement, aPseudoType, &ruleWalker); } lastStyleAttrRN = ruleWalker.CurrentNode(); haveImportantStyleAttrRules = !ruleWalker.GetCheckForImportantRules(); } } else { // Second time through, we handle the !important rule(s). if (haveImportantStyleAttrRules) { AddImportantRules(lastStyleAttrRN, lastScopedRN, &ruleWalker); } } break; } default: MOZ_ASSERT(false, "unexpected result from gCascadeLevels lookup"); break; } } while (rulesIndex != 0) { --rulesIndex; const RuleNodeInfo& ruleInfo = rules[rulesIndex]; if (ruleInfo.mLevel != level->mLevel || ruleInfo.mIsImportant != level->mIsImportant) { ++rulesIndex; break; } if (!doReplace) { ruleWalker.ForwardOnPossiblyCSSRule(ruleInfo.mRule); if (ruleInfo.mIsAnimationRule) { ruleWalker.CurrentNode()->SetIsAnimationRule(); } } } } NS_ASSERTION(rulesIndex == 0, "rules are in incorrect cascading order, " "which means we replaced them incorrectly"); return ruleWalker.CurrentNode(); } already_AddRefed nsStyleSet::ResolveStyleWithReplacement(Element* aElement, Element* aPseudoElement, nsStyleContext* aNewParentContext, nsStyleContext* aOldStyleContext, nsRestyleHint aReplacements, uint32_t aFlags) { nsRuleNode* ruleNode = RuleNodeWithReplacement(aElement, aPseudoElement, aOldStyleContext->RuleNode(), aOldStyleContext->GetPseudoType(), aReplacements); nsRuleNode* visitedRuleNode = nullptr; nsStyleContext* oldStyleIfVisited = aOldStyleContext->GetStyleIfVisited(); if (oldStyleIfVisited) { if (oldStyleIfVisited->RuleNode() == aOldStyleContext->RuleNode()) { visitedRuleNode = ruleNode; } else { visitedRuleNode = RuleNodeWithReplacement(aElement, aPseudoElement, oldStyleIfVisited->RuleNode(), oldStyleIfVisited->GetPseudoType(), aReplacements); } } uint32_t flags = eNoFlags; if (aOldStyleContext->IsLinkContext()) { flags |= eIsLink; // GetContext handles propagating RelevantLinkVisited state from the // parent in non-link cases; all we need to pass in is if this link // is visited. if (aOldStyleContext->RelevantLinkVisited()) { flags |= eIsVisitedLink; } } nsCSSPseudoElements::Type pseudoType = aOldStyleContext->GetPseudoType(); Element* elementForAnimation = nullptr; if (!(aFlags & eSkipStartingAnimations) && (pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || pseudoType == nsCSSPseudoElements::ePseudo_before || pseudoType == nsCSSPseudoElements::ePseudo_after)) { // We want to compute a correct elementForAnimation to pass in // because at this point the parameter is more than just the element // for animation; it's also used for the SetBodyTextColor call when // it's the body element. // However, we only want to set the flag to call CheckAnimationRule // if we're dealing with a replacement (such as style attribute // replacement) that could lead to the animation property changing, // and we explicitly do NOT want to call CheckAnimationRule when // we're trying to do an animation-only update. if (aReplacements & ~(eRestyle_CSSTransitions | eRestyle_CSSAnimations)) { flags |= eDoAnimation; } elementForAnimation = aElement; NS_ASSERTION(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || !elementForAnimation->GetPrimaryFrame() || elementForAnimation->GetPrimaryFrame()->StyleContext()-> GetPseudoType() == nsCSSPseudoElements::ePseudo_NotPseudoElement, "aElement should be the element and not the pseudo-element"); } if (aElement && aElement->IsRootOfAnonymousSubtree()) { // For anonymous subtree roots, don't tweak "display" value based on whether // or not the parent is styled as a flex/grid container. (If the parent // has anonymous-subtree kids, then we know it's not actually going to get // a flex/grid container frame, anyway.) flags |= eSkipParentDisplayBasedStyleFixup; } return GetContext(aNewParentContext, ruleNode, visitedRuleNode, aOldStyleContext->GetPseudo(), pseudoType, elementForAnimation, flags); } already_AddRefed nsStyleSet::ResolveStyleWithoutAnimation(dom::Element* aTarget, nsStyleContext* aStyleContext, nsRestyleHint aWhichToRemove) { #ifdef DEBUG nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType(); #endif MOZ_ASSERT(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || pseudoType == nsCSSPseudoElements::ePseudo_before || pseudoType == nsCSSPseudoElements::ePseudo_after, "unexpected type for animations"); RestyleManager* restyleManager = PresContext()->RestyleManager(); bool oldSkipAnimationRules = restyleManager->SkipAnimationRules(); restyleManager->SetSkipAnimationRules(true); RefPtr result = ResolveStyleWithReplacement(aTarget, nullptr, aStyleContext->GetParent(), aStyleContext, aWhichToRemove, eSkipStartingAnimations); restyleManager->SetSkipAnimationRules(oldSkipAnimationRules); return result.forget(); } already_AddRefed nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext) { return GetContext(aParentContext, mRuleTree, nullptr, nsCSSAnonBoxes::mozNonElement, nsCSSPseudoElements::ePseudo_AnonBox, nullptr, eNoFlags); } void nsStyleSet::WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType, nsRuleWalker* aRuleWalker) { // This needs to match GetPseudoRestriction in nsRuleNode.cpp. aRuleWalker->SetLevel(SheetType::Agent, false, false); if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLetter) aRuleWalker->Forward(mFirstLetterRule); else if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLine) aRuleWalker->Forward(mFirstLineRule); else if (aPseudoType == nsCSSPseudoElements::ePseudo_mozPlaceholder) aRuleWalker->Forward(mPlaceholderRule); } void nsStyleSet::WalkDisableTextZoomRule(Element* aElement, nsRuleWalker* aRuleWalker) { aRuleWalker->SetLevel(SheetType::Agent, false, false); if (aElement->IsSVGElement(nsGkAtoms::text)) aRuleWalker->Forward(mDisableTextZoomStyleRule); } already_AddRefed nsStyleSet::ResolvePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext, Element* aPseudoElement) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount, "must have pseudo element type"); NS_ASSERTION(aParentElement, "Must have parent element"); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); InitStyleScopes(treeContext, aParentElement); PseudoElementRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aType, treeContext, aPseudoElement); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (treeContext.HaveRelevantLink()) { treeContext.ResetForVisitedMatching(); ruleWalker.Reset(); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } // For pseudos, |data.IsLink()| being true means that // our parent node is a link. uint32_t flags = eNoFlags; if (aType == nsCSSPseudoElements::ePseudo_before || aType == nsCSSPseudoElements::ePseudo_after) { flags |= eDoAnimation; } else { // Flex and grid containers don't expect to have any pseudo-element children // aside from ::before and ::after. So if we have such a child, we're not // actually in a flex/grid container, and we should skip flex/grid item // style fixup. flags |= eSkipParentDisplayBasedStyleFixup; } return GetContext(aParentContext, ruleNode, visitedRuleNode, nsCSSPseudoElements::GetPseudoAtom(aType), aType, aParentElement, flags); } already_AddRefed nsStyleSet::ProbePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext) { TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); InitStyleScopes(treeContext, aParentElement); return ProbePseudoElementStyle(aParentElement, aType, aParentContext, treeContext); } already_AddRefed nsStyleSet::ProbePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext, TreeMatchContext& aTreeMatchContext, Element* aPseudoElement) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount, "must have pseudo element type"); NS_ASSERTION(aParentElement, "aParentElement must not be null"); nsIAtom* pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); aTreeMatchContext.ResetForUnvisitedMatching(); PseudoElementRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aType, aTreeMatchContext, aPseudoElement); WalkRestrictionRule(aType, &ruleWalker); // not the root if there was a restriction rule nsRuleNode *adjustedRoot = ruleWalker.CurrentNode(); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); if (ruleNode == adjustedRoot) { return nullptr; } nsRuleNode *visitedRuleNode = nullptr; if (aTreeMatchContext.HaveRelevantLink()) { aTreeMatchContext.ResetForVisitedMatching(); ruleWalker.Reset(); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } // For pseudos, |data.IsLink()| being true means that // our parent node is a link. uint32_t flags = eNoFlags; if (aType == nsCSSPseudoElements::ePseudo_before || aType == nsCSSPseudoElements::ePseudo_after) { flags |= eDoAnimation; } else { // Flex and grid containers don't expect to have any pseudo-element children // aside from ::before and ::after. So if we have such a child, we're not // actually in a flex/grid container, and we should skip flex/grid item // style fixup. flags |= eSkipParentDisplayBasedStyleFixup; } RefPtr result = GetContext(aParentContext, ruleNode, visitedRuleNode, pseudoTag, aType, aParentElement, flags); // For :before and :after pseudo-elements, having display: none or no // 'content' property is equivalent to not having the pseudo-element // at all. if (result && (pseudoTag == nsCSSPseudoElements::before || pseudoTag == nsCSSPseudoElements::after)) { const nsStyleDisplay *display = result->StyleDisplay(); const nsStyleContent *content = result->StyleContent(); // XXXldb What is contentCount for |content: ""|? if (display->mDisplay == NS_STYLE_DISPLAY_NONE || content->ContentCount() == 0) { result = nullptr; } } return result.forget(); } already_AddRefed nsStyleSet::ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag, nsStyleContext* aParentContext, uint32_t aFlags) { NS_ENSURE_FALSE(mInShutdown, nullptr); #ifdef DEBUG bool isAnonBox = nsCSSAnonBoxes::IsAnonBox(aPseudoTag) #ifdef MOZ_XUL && !nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag) #endif ; NS_PRECONDITION(isAnonBox, "Unexpected pseudo"); #endif nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); AnonBoxRuleProcessorData data(PresContext(), aPseudoTag, &ruleWalker); FileRules(EnumRulesMatching, &data, nullptr, &ruleWalker); if (aPseudoTag == nsCSSAnonBoxes::pageContent) { // Add any @page rules that are specified. nsTArray rules; nsTArray importantRules; PresContext()->StyleSet()->AppendPageRules(rules); for (uint32_t i = 0, i_end = rules.Length(); i != i_end; ++i) { css::Declaration* declaration = rules[i]->Declaration(); declaration->SetImmutable(); ruleWalker.Forward(declaration); css::ImportantStyleData* importantRule = declaration->GetImportantStyleData(); if (importantRule) { importantRules.AppendElement(importantRule); } } for (uint32_t i = 0, i_end = importantRules.Length(); i != i_end; ++i) { ruleWalker.Forward(importantRules[i]); } } return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr, aPseudoTag, nsCSSPseudoElements::ePseudo_AnonBox, nullptr, aFlags); } #ifdef MOZ_XUL already_AddRefed nsStyleSet::ResolveXULTreePseudoStyle(Element* aParentElement, nsIAtom* aPseudoTag, nsStyleContext* aParentContext, nsICSSPseudoComparator* aComparator) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aPseudoTag, "must have pseudo tag"); NS_ASSERTION(nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag), "Unexpected pseudo"); nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled); TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); InitStyleScopes(treeContext, aParentElement); XULTreeRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aPseudoTag, aComparator, treeContext); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (treeContext.HaveRelevantLink()) { treeContext.ResetForVisitedMatching(); ruleWalker.Reset(); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } return GetContext(aParentContext, ruleNode, visitedRuleNode, // For pseudos, |data.IsLink()| being true means that // our parent node is a link. aPseudoTag, nsCSSPseudoElements::ePseudo_XULTree, nullptr, eNoFlags); } #endif bool nsStyleSet::AppendFontFaceRules(nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, false); NS_ASSERTION(mBatching == 0, "rule processors out of date"); nsPresContext* presContext = PresContext(); for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { if (gCSSSheetTypes[i] == SheetType::ScopedDoc) continue; nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendFontFaceRules(presContext, aArray)) return false; } return true; } nsCSSKeyframesRule* nsStyleSet::KeyframesRuleForName(const nsString& aName) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(mBatching == 0, "rule processors out of date"); nsPresContext* presContext = PresContext(); for (uint32_t i = ArrayLength(gCSSSheetTypes); i-- != 0; ) { if (gCSSSheetTypes[i] == SheetType::ScopedDoc) continue; nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (!ruleProc) continue; nsCSSKeyframesRule* result = ruleProc->KeyframesRuleForName(presContext, aName); if (result) return result; } return nullptr; } nsCSSCounterStyleRule* nsStyleSet::CounterStyleRuleForName(const nsAString& aName) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(mBatching == 0, "rule processors out of date"); nsPresContext* presContext = PresContext(); for (uint32_t i = ArrayLength(gCSSSheetTypes); i-- != 0; ) { if (gCSSSheetTypes[i] == SheetType::ScopedDoc) continue; nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (!ruleProc) continue; nsCSSCounterStyleRule *result = ruleProc->CounterStyleRuleForName(presContext, aName); if (result) return result; } return nullptr; } bool nsStyleSet::AppendFontFeatureValuesRules( nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, false); NS_ASSERTION(mBatching == 0, "rule processors out of date"); nsPresContext* presContext = PresContext(); for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendFontFeatureValuesRules(presContext, aArray)) { return false; } } return true; } already_AddRefed nsStyleSet::GetFontFeatureValuesLookup() { if (mInitFontFeatureValuesLookup) { mInitFontFeatureValuesLookup = false; nsTArray rules; AppendFontFeatureValuesRules(rules); mFontFeatureValuesLookup = new gfxFontFeatureValueSet(); uint32_t i, numRules = rules.Length(); for (i = 0; i < numRules; i++) { nsCSSFontFeatureValuesRule *rule = rules[i]; const nsTArray& familyList = rule->GetFamilyList().GetFontlist(); const nsTArray& featureValues = rule->GetFeatureValues(); // for each family size_t f, numFam; numFam = familyList.Length(); for (f = 0; f < numFam; f++) { mFontFeatureValuesLookup->AddFontFeatureValues(familyList[f].mName, featureValues); } } } RefPtr lookup = mFontFeatureValuesLookup; return lookup.forget(); } bool nsStyleSet::AppendPageRules(nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, false); NS_ASSERTION(mBatching == 0, "rule processors out of date"); nsPresContext* presContext = PresContext(); for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { if (gCSSSheetTypes[i] == SheetType::ScopedDoc) continue; nsCSSRuleProcessor* ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendPageRules(presContext, aArray)) return false; } return true; } void nsStyleSet::BeginShutdown() { mInShutdown = 1; mRoots.Clear(); // no longer valid, since we won't keep it up to date } void nsStyleSet::Shutdown() { mRuleTree->Destroy(); mRuleTree = nullptr; // We can have old rule trees either because: // (1) we failed the assertions in EndReconstruct, or // (2) we're shutting down within a reconstruct (see bug 462392) for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) { --i; mOldRuleTrees[i]->Destroy(); } mOldRuleTrees.Clear(); } static const uint32_t kGCInterval = 300; void nsStyleSet::NotifyStyleContextDestroyed(nsStyleContext* aStyleContext) { if (mInShutdown) return; // Remove style contexts from mRoots even if mOldRuleTree is non-null. This // could be a style context from the new ruletree! if (!aStyleContext->GetParent()) { mRoots.RemoveElement(aStyleContext); } if (mInReconstruct) return; if (mUnusedRuleNodeCount >= kGCInterval) { GCRuleTrees(); } } void nsStyleSet::GCRuleTrees() { mUnusedRuleNodeCount = 0; // Mark the style context tree by marking all style contexts which // have no parent, which will mark all descendants. This will reach // style contexts in the undisplayed map and "additional style // contexts" since they are descendants of the roots. for (int32_t i = mRoots.Length() - 1; i >= 0; --i) { mRoots[i]->Mark(); } // Sweep the rule tree. #ifdef DEBUG bool deleted = #endif mRuleTree->Sweep(); NS_ASSERTION(!deleted, "Root node must not be gc'd"); // Sweep the old rule trees. for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) { --i; if (mOldRuleTrees[i]->Sweep()) { // It was deleted, as it should be. mOldRuleTrees.RemoveElementAt(i); } else { NS_NOTREACHED("old rule tree still referenced"); } } } already_AddRefed nsStyleSet::ReparentStyleContext(nsStyleContext* aStyleContext, nsStyleContext* aNewParentContext, Element* aElement) { MOZ_ASSERT(aStyleContext, "aStyleContext must not be null"); // This short-circuit is OK because we don't call TryStartingTransition // during style reresolution if the style context pointer hasn't changed. if (aStyleContext->GetParent() == aNewParentContext) { RefPtr ret = aStyleContext; return ret.forget(); } nsIAtom* pseudoTag = aStyleContext->GetPseudo(); nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType(); nsRuleNode* ruleNode = aStyleContext->RuleNode(); NS_ASSERTION(!PresContext()->RestyleManager()->SkipAnimationRules(), "we no longer handle SkipAnimationRules()"); nsRuleNode* visitedRuleNode = nullptr; nsStyleContext* visitedContext = aStyleContext->GetStyleIfVisited(); // Reparenting a style context just changes where we inherit from, // not what rules we match or what our DOM looks like. In // particular, it doesn't change whether this is a style context for // a link. if (visitedContext) { visitedRuleNode = visitedContext->RuleNode(); } uint32_t flags = eNoFlags; if (aStyleContext->IsLinkContext()) { flags |= eIsLink; // GetContext handles propagating RelevantLinkVisited state from the // parent in non-link cases; all we need to pass in is if this link // is visited. if (aStyleContext->RelevantLinkVisited()) { flags |= eIsVisitedLink; } } if (pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || pseudoType == nsCSSPseudoElements::ePseudo_before || pseudoType == nsCSSPseudoElements::ePseudo_after) { flags |= eDoAnimation; } if (aElement && aElement->IsRootOfAnonymousSubtree()) { // For anonymous subtree roots, don't tweak "display" value based on whether // or not the parent is styled as a flex/grid container. (If the parent // has anonymous-subtree kids, then we know it's not actually going to get // a flex/grid container frame, anyway.) flags |= eSkipParentDisplayBasedStyleFixup; } return GetContext(aNewParentContext, ruleNode, visitedRuleNode, pseudoTag, pseudoType, aElement, flags); } struct MOZ_STACK_CLASS StatefulData : public StateRuleProcessorData { StatefulData(nsPresContext* aPresContext, Element* aElement, EventStates aStateMask, TreeMatchContext& aTreeMatchContext) : StateRuleProcessorData(aPresContext, aElement, aStateMask, aTreeMatchContext), mHint(nsRestyleHint(0)) {} nsRestyleHint mHint; }; struct MOZ_STACK_CLASS StatefulPseudoElementData : public PseudoElementStateRuleProcessorData { StatefulPseudoElementData(nsPresContext* aPresContext, Element* aElement, EventStates aStateMask, nsCSSPseudoElements::Type aPseudoType, TreeMatchContext& aTreeMatchContext, Element* aPseudoElement) : PseudoElementStateRuleProcessorData(aPresContext, aElement, aStateMask, aPseudoType, aTreeMatchContext, aPseudoElement), mHint(nsRestyleHint(0)) {} nsRestyleHint mHint; }; static bool SheetHasDocumentStateStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulData* data = (StatefulData*)aData; if (aProcessor->HasDocumentStateDependentStyle(data)) { data->mHint = eRestyle_Self; return false; // don't continue } return true; // continue } // Test if style is dependent on a document state. bool nsStyleSet::HasDocumentStateDependentStyle(nsIContent* aContent, EventStates aStateMask) { if (!aContent || !aContent->IsElement()) return false; TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aContent->OwnerDoc()); InitStyleScopes(treeContext, aContent->AsElement()); StatefulData data(PresContext(), aContent->AsElement(), aStateMask, treeContext); WalkRuleProcessors(SheetHasDocumentStateStyle, &data, true); return data.mHint != 0; } static bool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulData* data = (StatefulData*)aData; nsRestyleHint hint = aProcessor->HasStateDependentStyle(data); data->mHint = nsRestyleHint(data->mHint | hint); return true; // continue } static bool SheetHasStatefulPseudoElementStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulPseudoElementData* data = (StatefulPseudoElementData*)aData; nsRestyleHint hint = aProcessor->HasStateDependentStyle(data); data->mHint = nsRestyleHint(data->mHint | hint); return true; // continue } // Test if style is dependent on content state nsRestyleHint nsStyleSet::HasStateDependentStyle(Element* aElement, EventStates aStateMask) { TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aElement->OwnerDoc()); InitStyleScopes(treeContext, aElement); StatefulData data(PresContext(), aElement, aStateMask, treeContext); WalkRuleProcessors(SheetHasStatefulStyle, &data, false); return data.mHint; } nsRestyleHint nsStyleSet::HasStateDependentStyle(Element* aElement, nsCSSPseudoElements::Type aPseudoType, Element* aPseudoElement, EventStates aStateMask) { TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aElement->OwnerDoc()); InitStyleScopes(treeContext, aElement); StatefulPseudoElementData data(PresContext(), aElement, aStateMask, aPseudoType, treeContext, aPseudoElement); WalkRuleProcessors(SheetHasStatefulPseudoElementStyle, &data, false); return data.mHint; } struct MOZ_STACK_CLASS AttributeData : public AttributeRuleProcessorData { AttributeData(nsPresContext* aPresContext, Element* aElement, int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType, bool aAttrHasChanged, const nsAttrValue* aOtherValue, TreeMatchContext& aTreeMatchContext) : AttributeRuleProcessorData(aPresContext, aElement, aNameSpaceID, aAttribute, aModType, aAttrHasChanged, aOtherValue, aTreeMatchContext), mHint(nsRestyleHint(0)) {} nsRestyleHint mHint; RestyleHintData mHintData; }; static bool SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { AttributeData* data = (AttributeData*)aData; nsRestyleHint hint = aProcessor->HasAttributeDependentStyle(data, data->mHintData); data->mHint = nsRestyleHint(data->mHint | hint); return true; // continue } // Test if style is dependent on content state nsRestyleHint nsStyleSet::HasAttributeDependentStyle(Element* aElement, int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType, bool aAttrHasChanged, const nsAttrValue* aOtherValue, mozilla::RestyleHintData& aRestyleHintDataResult) { TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aElement->OwnerDoc()); InitStyleScopes(treeContext, aElement); AttributeData data(PresContext(), aElement, aNameSpaceID, aAttribute, aModType, aAttrHasChanged, aOtherValue, treeContext); WalkRuleProcessors(SheetHasAttributeStyle, &data, false); if (!(data.mHint & eRestyle_Subtree)) { // No point keeping the list of selectors around if we are going to // restyle the whole subtree unconditionally. aRestyleHintDataResult = Move(data.mHintData); } return data.mHint; } bool nsStyleSet::MediumFeaturesChanged() { NS_ASSERTION(mBatching == 0, "rule processors out of date"); // We can't use WalkRuleProcessors without a content node. nsPresContext* presContext = PresContext(); bool stylesChanged = false; for (nsIStyleRuleProcessor* processor : mRuleProcessors) { if (!processor) { continue; } bool thisChanged = processor->MediumFeaturesChanged(presContext); stylesChanged = stylesChanged || thisChanged; } for (nsIStyleRuleProcessor* processor : mScopedDocSheetRuleProcessors) { bool thisChanged = processor->MediumFeaturesChanged(presContext); stylesChanged = stylesChanged || thisChanged; } if (mBindingManager) { bool thisChanged = false; mBindingManager->MediumFeaturesChanged(presContext, &thisChanged); stylesChanged = stylesChanged || thisChanged; } return stylesChanged; } bool nsStyleSet::EnsureUniqueInnerOnCSSSheets() { nsAutoTArray queue; for (SheetType type : gCSSSheetTypes) { for (CSSStyleSheet* sheet : mSheets[type]) { queue.AppendElement(sheet); } } if (mBindingManager) { mBindingManager->AppendAllSheets(queue); } while (!queue.IsEmpty()) { uint32_t idx = queue.Length() - 1; CSSStyleSheet* sheet = queue[idx]; queue.RemoveElementAt(idx); sheet->EnsureUniqueInner(); // Enqueue all the sheet's children. sheet->AppendAllChildSheets(queue); } bool res = mNeedsRestyleAfterEnsureUniqueInner; mNeedsRestyleAfterEnsureUniqueInner = false; return res; } nsIStyleRule* nsStyleSet::InitialStyleRule() { if (!mInitialStyleRule) { mInitialStyleRule = new nsInitialStyleRule; } return mInitialStyleRule; } bool nsStyleSet::HasRuleProcessorUsedByMultipleStyleSets(SheetType aSheetType) { MOZ_ASSERT(size_t(aSheetType) < ArrayLength(mRuleProcessors)); if (!IsCSSSheetType(aSheetType) || !mRuleProcessors[aSheetType]) { return false; } nsCSSRuleProcessor* rp = static_cast(mRuleProcessors[aSheetType].get()); return rp->IsUsedByMultipleStyleSets(); } void nsStyleSet::ClearSelectors() { // We might be called before we've done our first rule tree construction. if (!mRuleTree) { return; } PresContext()->RestyleManager()->ClearSelectors(); }