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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
#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;
enum class StyleRelativeSelectorNthEdgeInvalidateFor : uint8_t;
struct StyleRuleChange;
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*, const StyleRuleChange&);
void SheetCloned(StyleSheet&);
void ImportRuleLoaded(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&, const PseudoStyleRequest& aPseudoRequest = {},
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);
// Try to resolve the staring style for a given element. Please call this
// function after checking if it may have rules inside @starting-style.
already_AddRefed<ComputedStyle> ResolveStartingStyle(dom::Element& aElement);
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.
*
*/
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,
const PseudoStyleRequest& aPseudoRequest, 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 a Custom State might require us to
* restyle the relative selector it refers to.
*/
void MaybeInvalidateRelativeSelectorCustomStateDependency(
const dom::Element&, nsAtom* state,
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&, StyleRelativeSelectorNthEdgeInvalidateFor);
/**
* 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*, bool aForceRestyleSiblings);
/**
* 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);
/**
* 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;
/**
* Returns true if a change in Custom State on an element might require
* us to restyle the element's siblings.
*/
bool HasNthOfCustomStateDependency(const dom::Element&, nsAtom*) 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&, const StyleRuleChange&);
/**
* 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, RefPtr<ComputedStyle>,
size_t(nsCSSAnonBoxes::NonInheriting::_Count)>
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