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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /layout/style/ServoStyleSet.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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diff --git a/layout/style/ServoStyleSet.h b/layout/style/ServoStyleSet.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_ServoStyleSet_h
+#define mozilla_ServoStyleSet_h
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/AnonymousContentKey.h"
+#include "mozilla/AtomArray.h"
+#include "mozilla/EnumeratedArray.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/PostTraversalTask.h"
+#include "mozilla/ServoBindingTypes.h"
+#include "mozilla/ServoUtils.h"
+#include "mozilla/dom/RustTypes.h"
+#include "mozilla/UniquePtr.h"
+#include "MainThreadUtils.h"
+#include "nsCSSPseudoElements.h"
+#include "nsCSSAnonBoxes.h"
+#include "nsChangeHint.h"
+#include "nsCoord.h"
+#include "nsAtom.h"
+#include "nsIMemoryReporter.h"
+#include "nsTArray.h"
+#include "nsSize.h"
+
+namespace mozilla {
+enum class MediaFeatureChangeReason : uint8_t;
+enum class StylePageSizeOrientation : uint8_t;
+enum class StyleRuleChangeKind : uint32_t;
+
+class ErrorResult;
+
+template <typename Integer, typename Number, typename LinearStops>
+struct StyleTimingFunction;
+struct StylePagePseudoClassFlags;
+struct StylePiecewiseLinearFunction;
+using StyleComputedTimingFunction =
+ StyleTimingFunction<int32_t, float, StylePiecewiseLinearFunction>;
+
+namespace css {
+class Rule;
+} // namespace css
+namespace dom {
+class CSSImportRule;
+class Element;
+class ShadowRoot;
+struct PropertyDefinition;
+} // namespace dom
+namespace gfx {
+class FontPaletteValueSet;
+} // namespace gfx
+class StyleSheet;
+struct Keyframe;
+class ServoElementSnapshotTable;
+class ComputedStyle;
+class ServoStyleRuleMap;
+class StyleSheet;
+} // namespace mozilla
+class gfxFontFeatureValueSet;
+class nsIContent;
+
+class nsPresContext;
+class nsWindowSizes;
+struct TreeMatchContext;
+
+namespace mozilla {
+
+// A few flags used to track which kind of stylist state we may need to
+// update.
+enum class StylistState : uint8_t {
+ // The stylist is not dirty, we should do nothing.
+ NotDirty = 0,
+
+ // The style sheets have changed, so we need to update the style data.
+ StyleSheetsDirty = 1 << 0,
+
+ // Some of the style sheets of the shadow trees in the document have
+ // changed.
+ ShadowDOMStyleSheetsDirty = 1 << 1,
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(StylistState)
+
+enum class StyleOrigin : uint8_t;
+
+// Bitfield type to represent Servo stylesheet origins.
+enum class OriginFlags : uint8_t {
+ UserAgent = 0x01,
+ User = 0x02,
+ Author = 0x04,
+ All = 0x07,
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(OriginFlags)
+
+/**
+ * The set of style sheets that apply to a document, backed by a Servo
+ * Stylist. A ServoStyleSet contains StyleSheets.
+ */
+class ServoStyleSet {
+ friend class RestyleManager;
+ using SnapshotTable = ServoElementSnapshotTable;
+ using Origin = StyleOrigin;
+
+ // We assert that these match the Servo ones in the definition of this array.
+ static constexpr Origin kOrigins[] = {
+ Origin(static_cast<uint8_t>(OriginFlags::UserAgent)),
+ Origin(static_cast<uint8_t>(OriginFlags::User)),
+ Origin(static_cast<uint8_t>(OriginFlags::Author)),
+ };
+
+ public:
+ static bool IsInServoTraversal() { return mozilla::IsInServoTraversal(); }
+
+#ifdef DEBUG
+ // Used for debug assertions. We make this debug-only to prevent callers from
+ // accidentally using it instead of IsInServoTraversal, which is cheaper. We
+ // can change this if a use-case arises.
+ static bool IsCurrentThreadInServoTraversal();
+#endif
+
+ static ServoStyleSet* Current() { return sInServoTraversal; }
+
+ explicit ServoStyleSet(dom::Document&);
+ ~ServoStyleSet();
+
+ void ShellDetachedFromDocument();
+
+ // Called when a rules in a stylesheet in this set, or a child sheet of that,
+ // are mutated from CSSOM.
+ void RuleAdded(StyleSheet&, css::Rule&);
+ void RuleRemoved(StyleSheet&, css::Rule&);
+ void RuleChanged(StyleSheet&, css::Rule*, StyleRuleChangeKind);
+ void SheetCloned(StyleSheet&);
+ void ImportRuleLoaded(dom::CSSImportRule&, StyleSheet&);
+
+ // Runs style invalidation due to document state changes.
+ void InvalidateStyleForDocumentStateChanges(
+ dom::DocumentState aStatesChanged);
+
+ void RecordShadowStyleChange(dom::ShadowRoot&);
+
+ bool StyleSheetsHaveChanged() const { return StylistNeedsUpdate(); }
+
+ RestyleHint MediumFeaturesChanged(MediaFeatureChangeReason);
+
+ // Evaluates a given SourceSizeList, returning the optimal viewport width in
+ // app units.
+ //
+ // The SourceSizeList parameter can be null, in which case it will return
+ // 100vw.
+ inline nscoord EvaluateSourceSizeList(
+ const StyleSourceSizeList* aSourceSizeList) const;
+
+ void AddSizeOfIncludingThis(nsWindowSizes& aSizes) const;
+ const StylePerDocumentStyleData* RawData() const { return mRawData.get(); }
+
+ bool GetAuthorStyleDisabled() const { return mAuthorStyleDisabled; }
+
+ bool UsesFontMetrics() const;
+
+ void SetAuthorStyleDisabled(bool aStyleDisabled);
+
+ // Get a CopmutedStyle for a text node (which no rules will match).
+ //
+ // The returned ComputedStyle will have nsCSSAnonBoxes::mozText() as its
+ // pseudo.
+ //
+ // (Perhaps mozText should go away and we shouldn't even create style
+ // contexts for such content nodes, when text-combine-upright is not
+ // present. However, not doing any rule matching for them is a first step.)
+ already_AddRefed<ComputedStyle> ResolveStyleForText(
+ nsIContent* aTextNode, ComputedStyle* aParentStyle);
+
+ // Get a ComputedStyle for a first-letter continuation (which no rules will
+ // match).
+ //
+ // The returned ComputedStyle will have
+ // nsCSSAnonBoxes::firstLetterContinuation() as its pseudo.
+ //
+ // (Perhaps nsCSSAnonBoxes::firstLetterContinuation() should go away and we
+ // shouldn't even create ComputedStyles for such frames. However, not doing
+ // any rule matching for them is a first step. And right now we do use this
+ // ComputedStyle for some things)
+ already_AddRefed<ComputedStyle> ResolveStyleForFirstLetterContinuation(
+ ComputedStyle* aParentStyle);
+
+ // Get a ComputedStyle for a placeholder frame (which no rules will match).
+ //
+ // The returned ComputedStyle will have nsCSSAnonBoxes::oofPlaceholder() as
+ // its pseudo.
+ //
+ // (Perhaps nsCSSAnonBoxes::oofPaceholder() should go away and we shouldn't
+ // even create ComputedStyle for placeholders. However, not doing any rule
+ // matching for them is a first step.)
+ already_AddRefed<ComputedStyle> ResolveStyleForPlaceholder();
+
+ // Returns whether a given pseudo-element should exist or not.
+ static bool GeneratedContentPseudoExists(const ComputedStyle& aParentStyle,
+ const ComputedStyle& aPseudoStyle);
+
+ enum class IsProbe {
+ No,
+ Yes,
+ };
+
+ // Get a style for a pseudo-element.
+ //
+ // If IsProbe is Yes, then no style is returned if there are no rules matching
+ // for the pseudo-element, or GeneratedContentPseudoExists returns false.
+ //
+ // If IsProbe is No, then the style is guaranteed to be non-null.
+ already_AddRefed<ComputedStyle> ResolvePseudoElementStyle(
+ const dom::Element& aOriginatingElement, PseudoStyleType,
+ nsAtom* aFunctionalPseudoParameter, ComputedStyle* aParentStyle,
+ IsProbe = IsProbe::No);
+
+ already_AddRefed<ComputedStyle> ProbePseudoElementStyle(
+ const dom::Element& aOriginatingElement, PseudoStyleType aType,
+ nsAtom* aFunctionalPseudoParameter, ComputedStyle* aParentStyle) {
+ return ResolvePseudoElementStyle(aOriginatingElement, aType,
+ aFunctionalPseudoParameter, aParentStyle,
+ IsProbe::Yes);
+ }
+
+ // Resolves style for a (possibly-pseudo) Element without assuming that the
+ // style has been resolved. If the element was unstyled and a new style
+ // was resolved, it is not stored in the DOM. (That is, the element remains
+ // unstyled.)
+ already_AddRefed<ComputedStyle> ResolveStyleLazily(
+ const dom::Element&, PseudoStyleType = PseudoStyleType::NotPseudo,
+ nsAtom* aFunctionalPseudoParameter = nullptr,
+ StyleRuleInclusion = StyleRuleInclusion::All);
+
+ // Get a ComputedStyle for an anonymous box. The pseudo type must be an
+ // inheriting anon box.
+ already_AddRefed<ComputedStyle> ResolveInheritingAnonymousBoxStyle(
+ PseudoStyleType, ComputedStyle* aParentStyle);
+
+ // Get a ComputedStyle for an anonymous box. The pseudo type must be
+ // a non-inheriting anon box, and must not be page-content.
+ // See ResolvePageContentStyle for resolving page-content style.
+ already_AddRefed<ComputedStyle> ResolveNonInheritingAnonymousBoxStyle(
+ PseudoStyleType aType);
+
+ // Get a ComputedStyle for a pageContent box with the specified page-name.
+ // A page name that is null or the empty atom and has no pseudo classes gets
+ // the global page style.
+ already_AddRefed<ComputedStyle> ResolvePageContentStyle(
+ const nsAtom* aPageName, const StylePagePseudoClassFlags& aPseudo);
+
+ already_AddRefed<ComputedStyle> ResolveXULTreePseudoStyle(
+ dom::Element* aParentElement, nsCSSAnonBoxPseudoStaticAtom* aPseudoTag,
+ ComputedStyle* aParentStyle, const AtomArray& aInputWord);
+
+ size_t SheetCount(Origin) const;
+ StyleSheet* SheetAt(Origin, size_t aIndex) const;
+
+ struct PageSizeAndOrientation {
+ Maybe<StylePageSizeOrientation> orientation;
+ Maybe<nsSize> size;
+ };
+ // Gets the default page size and orientation (the size/orientation specified
+ // by @page rules without a selector list), if any.
+ //
+ // If the specified size is just an orientation, then the size will be set to
+ // nothing and the orientation will be set accordingly.
+ // If the specified size is auto or square, then the orientation will be set
+ // to nothing.
+ // Otherwise, the size will and orientation is determined by the specified
+ // page size.
+ PageSizeAndOrientation GetDefaultPageSizeAndOrientation();
+
+ void AppendAllNonDocumentAuthorSheets(nsTArray<StyleSheet*>& aArray) const;
+
+ // Manage the set of style sheets in the style set
+ void AppendStyleSheet(StyleSheet&);
+ void InsertStyleSheetBefore(StyleSheet&, StyleSheet& aReferenceSheet);
+ void RemoveStyleSheet(StyleSheet&);
+ void AddDocStyleSheet(StyleSheet&);
+
+ /**
+ * Performs a Servo traversal to compute style for all dirty nodes in the
+ * document.
+ *
+ * This will traverse all of the document's style roots (that is, its document
+ * element, and the roots of the document-level native anonymous content).
+ *
+ * We specify |ForCSSRuleChanges| to try to update all CSS animations
+ * when we call this function due to CSS rule changes since @keyframes rules
+ * may have changed.
+ *
+ * Returns true if a post-traversal is required.
+ */
+ bool StyleDocument(ServoTraversalFlags aFlags);
+
+ /**
+ * Eagerly styles a subtree of unstyled nodes that was just appended to the
+ * tree. This is used in situations where we need the style immediately and
+ * cannot wait for a future batch restyle.
+ */
+ void StyleNewSubtree(dom::Element* aRoot);
+
+ /**
+ * Helper for correctly calling UpdateStylist without paying the cost of an
+ * extra function call in the common no-rebuild-needed case.
+ */
+ void UpdateStylistIfNeeded() {
+ if (StylistNeedsUpdate()) {
+ UpdateStylist();
+ }
+ }
+
+ /**
+ * Checks whether the rule tree has crossed its threshold for unused nodes,
+ * and if so, frees them.
+ */
+ void MaybeGCRuleTree();
+
+ /**
+ * Returns true if the given element may be used as the root of a style
+ * traversal. Reasons for false include having an unstyled parent, or having
+ * a parent that is display:none.
+ *
+ * Most traversal callsites don't need to check this, but some do.
+ */
+ static bool MayTraverseFrom(const dom::Element* aElement);
+
+#ifdef DEBUG
+ void AssertTreeIsClean();
+#else
+ void AssertTreeIsClean() {}
+#endif
+
+ /**
+ * Clears any cached style data that may depend on all sorts of computed
+ * values.
+ *
+ * Right now this clears the non-inheriting ComputedStyle cache, resets the
+ * default computed values, and clears cached anonymous content style.
+ *
+ * This does _not_, however, clear the stylist.
+ */
+ void ClearCachedStyleData();
+
+ /**
+ * Notifies the Servo stylesheet that the document's compatibility mode has
+ * changed.
+ */
+ void CompatibilityModeChanged();
+
+ template <typename T>
+ void EnumerateStyleSheets(T aCb) {
+ for (auto origin : kOrigins) {
+ for (size_t i = 0, count = SheetCount(origin); i < count; ++i) {
+ aCb(*SheetAt(origin, i));
+ }
+ }
+ }
+
+ /**
+ * Resolve style for the given element, and return it as a
+ * ComputedStyle.
+ *
+ * FIXME(emilio): Is there a point in this after bug 1367904?
+ */
+ static inline already_AddRefed<ComputedStyle> ResolveServoStyle(
+ const dom::Element&);
+
+ bool GetKeyframesForName(const dom::Element&, const ComputedStyle&,
+ nsAtom* aName,
+ const StyleComputedTimingFunction& aTimingFunction,
+ nsTArray<Keyframe>& aKeyframes);
+
+ nsTArray<ComputedKeyframeValues> GetComputedKeyframeValuesFor(
+ const nsTArray<Keyframe>& aKeyframes, dom::Element* aElement,
+ PseudoStyleType aPseudoType, const ComputedStyle* aStyle);
+
+ void GetAnimationValues(
+ StyleLockedDeclarationBlock* aDeclarations, dom::Element* aElement,
+ const mozilla::ComputedStyle* aStyle,
+ nsTArray<RefPtr<StyleAnimationValue>>& aAnimationValues);
+
+ void AppendFontFaceRules(nsTArray<nsFontFaceRuleContainer>& aArray);
+
+ const StyleLockedCounterStyleRule* CounterStyleRuleForName(nsAtom* aName);
+
+ // Get all the currently-active font feature values set.
+ already_AddRefed<gfxFontFeatureValueSet> BuildFontFeatureValueSet();
+
+ // Get the set of all currently-active font-palette-values.
+ already_AddRefed<gfx::FontPaletteValueSet> BuildFontPaletteValueSet();
+
+ already_AddRefed<ComputedStyle> GetBaseContextForElement(
+ dom::Element* aElement, const ComputedStyle* aStyle);
+
+ /**
+ * Resolve style for a given declaration block with/without the parent style.
+ * If the parent style is not specified, the document default computed values
+ * is used.
+ */
+ already_AddRefed<ComputedStyle> ResolveForDeclarations(
+ const ComputedStyle* aParentOrNull,
+ const StyleLockedDeclarationBlock* aDeclarations);
+
+ already_AddRefed<StyleAnimationValue> ComputeAnimationValue(
+ dom::Element* aElement, StyleLockedDeclarationBlock* aDeclaration,
+ const mozilla::ComputedStyle* aStyle);
+
+ void AppendTask(PostTraversalTask aTask) {
+ MOZ_ASSERT(IsInServoTraversal());
+
+ // We currently only use PostTraversalTasks while the Servo font metrics
+ // mutex is locked. If we need to use them in other situations during
+ // a traversal, we should assert that we've taken appropriate
+ // synchronization measures.
+ AssertIsMainThreadOrServoFontMetricsLocked();
+
+ mPostTraversalTasks.AppendElement(aTask);
+ }
+
+ // Returns true if a restyle of the document is needed due to cloning
+ // sheet inners.
+ bool EnsureUniqueInnerOnCSSSheets();
+
+ // Returns the style rule map.
+ ServoStyleRuleMap* StyleRuleMap();
+
+ /**
+ * Returns true if a modification to an an attribute with the specified
+ * local name might require us to restyle the element.
+ *
+ * This function allows us to skip taking a an attribute snapshot when
+ * the modified attribute doesn't appear in an attribute selector in
+ * a style sheet.
+ */
+ bool MightHaveAttributeDependency(const dom::Element&,
+ nsAtom* aAttribute) const;
+
+ /**
+ * Returns true if a modification to an attribute with the specified local
+ * name might require us to restyle the element's siblings.
+ */
+ bool MightHaveNthOfAttributeDependency(const dom::Element&,
+ nsAtom* aAttribute) const;
+
+ /**
+ * Returns true if a modification to a class might require us to restyle the
+ * element's siblings.
+ */
+ bool MightHaveNthOfClassDependency(const dom::Element&);
+
+ /**
+ * Returns true if a modification to an ID might require us to restyle the
+ * element's siblings.
+ */
+ bool MightHaveNthOfIDDependency(const dom::Element&, nsAtom* aOldID,
+ nsAtom* aNewID) const;
+
+ /**
+ * Maybe invalidate if a modification to an ID might require us to restyle
+ * the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorIDDependency(
+ const dom::Element&, nsAtom* aOldID, nsAtom* aNewID,
+ const ServoElementSnapshotTable& aSnapshots);
+
+ /**
+ * Maybe invalidate if a modification to an attribute with the specified local
+ * name might require us to restyle the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorClassDependency(
+ const dom::Element&, const ServoElementSnapshotTable& aSnapshots);
+
+ /**
+ * Maybe invalidate if a modification to an ID might require us to restyle
+ * the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorAttributeDependency(
+ const dom::Element&, nsAtom* aAttribute,
+ const ServoElementSnapshotTable& aSnapshots);
+
+ /**
+ * Maybe invalidate if a change in event state on an element might require us
+ * to restyle the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorStateDependency(
+ const dom::Element&, dom::ElementState,
+ const ServoElementSnapshotTable& aSnapshots);
+
+ /**
+ * Maybe invalidate if a change on an element that might be selected by :empty
+ * that might require us to restyle the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorForEmptyDependency(const dom::Element&);
+
+ /**
+ * Maybe invalidate if a state change on an element that might be selected
+ * by a selector that can only selector first/last child, that
+ * might require us to restyle the relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorForNthEdgeDependency(const dom::Element&);
+
+ /**
+ * Maybe invalidate if a state change on an element that might be selected by
+ * :nth-* (Or :nth-like) selectors that might require us to restyle the
+ * relative selector it refers to.
+ */
+ void MaybeInvalidateRelativeSelectorForNthDependencyFromSibling(
+ const dom::Element*);
+
+ /**
+ * Maybe invalidate if a DOM element insertion might require us to restyle
+ * the relative selector to ancestors/previous siblings.
+ */
+ void MaybeInvalidateForElementInsertion(const dom::Element&);
+
+ /**
+ * Maybe invalidate if a series of nodes is appended, among which may
+ * be element(s) that might require us to restyle the relative selector
+ * to ancestors/previous siblings.
+ */
+ void MaybeInvalidateForElementAppend(const nsIContent&);
+
+ /**
+ * Maybe invalidate if a DOM element removal might require us to restyle
+ * the relative selector to ancestors/previous siblings.
+ */
+ void MaybeInvalidateForElementRemove(const dom::Element& aElement,
+ const nsIContent* aFollowingSibling);
+
+ /**
+ * Returns true if a change in event state on an element might require
+ * us to restyle the element.
+ *
+ * This function allows us to skip taking a state snapshot when
+ * the changed state isn't depended upon by any pseudo-class selectors
+ * in a style sheet.
+ */
+ bool HasStateDependency(const dom::Element&, dom::ElementState) const;
+
+ /**
+ * Returns true if a change in event state on an element might require
+ * us to restyle the element's siblings.
+ */
+ bool HasNthOfStateDependency(const dom::Element&, dom::ElementState) const;
+
+ /**
+ * Restyle this element's siblings in order to propagate any potential change
+ * in :nth-child(of) styling.
+ */
+ void RestyleSiblingsForNthOf(const dom::Element&, uint32_t) const;
+
+ /**
+ * Returns true if a change in document state might require us to restyle the
+ * document.
+ */
+ bool HasDocumentStateDependency(dom::DocumentState) const;
+
+ /**
+ * Get a new ComputedStyle that uses the same rules as the given ComputedStyle
+ * but has a different parent.
+ *
+ * aElement is non-null if this is a ComputedStyle for a frame whose mContent
+ * is an element and which has no pseudo on its ComputedStyle (so it's the
+ * actual style for the element being passed).
+ */
+ already_AddRefed<ComputedStyle> ReparentComputedStyle(
+ ComputedStyle* aComputedStyle, ComputedStyle* aNewParent,
+ ComputedStyle* aNewLayoutParent, dom::Element* aElement);
+
+ /**
+ * Invalidate styles where there's any viewport units dependent style.
+ */
+ enum class OnlyDynamic : bool { No, Yes };
+ void InvalidateForViewportUnits(OnlyDynamic);
+
+ private:
+ friend class AutoSetInServoTraversal;
+ friend class AutoPrepareTraversal;
+ friend class PostTraversalTask;
+
+ bool ShouldTraverseInParallel() const;
+
+ void RuleChangedInternal(StyleSheet&, css::Rule&, StyleRuleChangeKind);
+
+ /**
+ * Forces all the ShadowRoot styles to be dirty.
+ *
+ * Only to be used for:
+ *
+ * * Devtools (dealing with sheet cloning).
+ * * Compatibility-mode changes.
+ *
+ * Try to do something more incremental for other callers that are exposed to
+ * the web.
+ */
+ void ForceDirtyAllShadowStyles();
+
+ /**
+ * Gets the pending snapshots to handle from the restyle manager.
+ */
+ const SnapshotTable& Snapshots();
+
+ /**
+ * Clear our cached mNonInheritingComputedStyles.
+ *
+ * We do this when we want to make sure those ComputedStyles won't live too
+ * long (e.g. when rebuilding all style data or when shutting down the style
+ * set).
+ */
+ void ClearNonInheritingComputedStyles();
+
+ /**
+ * Perform processes that we should do before traversing.
+ *
+ * When aRoot is null, the entire document is pre-traversed. Otherwise,
+ * only the subtree rooted at aRoot is pre-traversed.
+ */
+ void PreTraverse(ServoTraversalFlags aFlags, dom::Element* aRoot = nullptr);
+
+ // Subset of the pre-traverse steps that involve syncing up data
+ void PreTraverseSync();
+
+ /**
+ * Records that the contents of style sheets at the specified origin have
+ * changed since the last. Calling this will ensure that the Stylist
+ * rebuilds its selector maps.
+ */
+ void MarkOriginsDirty(OriginFlags aChangedOrigins);
+
+ /**
+ * Note that the stylist needs a style flush due to style sheet changes.
+ */
+ void SetStylistStyleSheetsDirty();
+
+ void SetStylistShadowDOMStyleSheetsDirty();
+
+ bool StylistNeedsUpdate() const {
+ return mStylistState != StylistState::NotDirty;
+ }
+
+ /**
+ * Update the stylist as needed to ensure style data is up-to-date.
+ *
+ * This should only be called if StylistNeedsUpdate returns true.
+ */
+ void UpdateStylist();
+
+ void RunPostTraversalTasks();
+
+ void PrependSheetOfType(Origin, StyleSheet*);
+ void AppendSheetOfType(Origin, StyleSheet*);
+ void InsertSheetOfType(Origin, StyleSheet*, StyleSheet* aBeforeSheet);
+ void RemoveSheetOfType(Origin, StyleSheet*);
+
+ const nsPresContext* GetPresContext() const {
+ return const_cast<ServoStyleSet*>(this)->GetPresContext();
+ }
+
+ /**
+ * Return the associated pres context if we're the master style set and we
+ * have an associated pres shell.
+ */
+ nsPresContext* GetPresContext();
+
+ // The owner document of this style set. Never null, and always outlives the
+ // StyleSet.
+ dom::Document* mDocument;
+ UniquePtr<StylePerDocumentStyleData> mRawData;
+
+ // Map from raw Servo style rule to Gecko's wrapper object.
+ // Constructed lazily when requested by devtools.
+ UniquePtr<ServoStyleRuleMap> mStyleRuleMap;
+ uint64_t mUserFontSetUpdateGeneration = 0;
+
+ // Tasks to perform after a traversal, back on the main thread.
+ //
+ // These are similar to Servo's SequentialTasks, except that they are
+ // posted by C++ code running on style worker threads.
+ nsTArray<PostTraversalTask> mPostTraversalTasks;
+
+ // Stores pointers to our cached ComputedStyles for non-inheriting anonymous
+ // boxes.
+ EnumeratedArray<nsCSSAnonBoxes::NonInheriting,
+ nsCSSAnonBoxes::NonInheriting::_Count, RefPtr<ComputedStyle>>
+ mNonInheritingComputedStyles;
+
+ public:
+ void PutCachedAnonymousContentStyles(
+ AnonymousContentKey aKey, nsTArray<RefPtr<ComputedStyle>>&& aStyles) {
+ auto index = static_cast<size_t>(aKey);
+
+ MOZ_ASSERT(mCachedAnonymousContentStyles.Length() + aStyles.Length() < 256,
+ "(index, length) pairs must be bigger");
+ MOZ_ASSERT(mCachedAnonymousContentStyleIndexes[index].second == 0,
+ "shouldn't need to overwrite existing cached styles");
+ MOZ_ASSERT(!aStyles.IsEmpty(), "should have some styles to cache");
+
+ mCachedAnonymousContentStyleIndexes[index] = std::make_pair(
+ mCachedAnonymousContentStyles.Length(), aStyles.Length());
+ mCachedAnonymousContentStyles.AppendElements(std::move(aStyles));
+ }
+
+ void GetCachedAnonymousContentStyles(
+ AnonymousContentKey aKey, nsTArray<RefPtr<ComputedStyle>>& aStyles) {
+ auto index = static_cast<size_t>(aKey);
+ auto loc = mCachedAnonymousContentStyleIndexes[index];
+ aStyles.AppendElements(mCachedAnonymousContentStyles.Elements() + loc.first,
+ loc.second);
+ }
+
+ void RegisterProperty(const dom::PropertyDefinition&, ErrorResult&);
+
+ private:
+ // Map of AnonymousContentKey values to an (index, length) pair pointing into
+ // mCachedAnonymousContentStyles.
+ //
+ // We assert that the index and length values fit into uint8_ts.
+ Array<std::pair<uint8_t, uint8_t>, 1 << sizeof(AnonymousContentKey) * 8>
+ mCachedAnonymousContentStyleIndexes;
+
+ // Stores cached ComputedStyles for certain native anonymous content.
+ nsTArray<RefPtr<ComputedStyle>> mCachedAnonymousContentStyles;
+
+ StylistState mStylistState = StylistState::NotDirty;
+ bool mAuthorStyleDisabled = false;
+ bool mNeedsRestyleAfterEnsureUniqueInner = false;
+};
+
+class UACacheReporter final : public nsIMemoryReporter {
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIMEMORYREPORTER
+
+ private:
+ ~UACacheReporter() = default;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_ServoStyleSet_h