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gecko-dev/layout/style/nsComputedDOMStyle.cpp

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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/. */
/* DOM object returned from element.getComputedStyle() */
#include "nsComputedDOMStyle.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/StaticPrefs_layout.h"
#include "nsError.h"
#include "nsIFrame.h"
#include "nsIFrameInlines.h"
#include "mozilla/ComputedStyle.h"
#include "nsContentUtils.h"
#include "nsDocShell.h"
#include "nsIContent.h"
#include "nsStyleConsts.h"
#include "nsDOMCSSValueList.h"
#include "nsFlexContainerFrame.h"
#include "nsGridContainerFrame.h"
#include "nsGkAtoms.h"
#include "mozilla/ReflowInput.h"
#include "nsStyleUtil.h"
#include "nsStyleStructInlines.h"
#include "nsROCSSPrimitiveValue.h"
#include "nsPresContext.h"
#include "mozilla/dom/Document.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h"
#include "mozilla/EffectSet.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/ViewportFrame.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsDOMCSSDeclaration.h"
#include "nsStyleTransformMatrix.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementInlines.h"
#include "prtime.h"
#include "nsWrapperCacheInlines.h"
#include "mozilla/AppUnits.h"
#include <algorithm>
#include "mozilla/ComputedStyleInlines.h"
#include "nsPrintfCString.h"
using namespace mozilla;
using namespace mozilla::dom;
/*
* This is the implementation of the readonly CSSStyleDeclaration that is
* returned by the getComputedStyle() function.
*/
already_AddRefed<nsComputedDOMStyle> NS_NewComputedDOMStyle(
dom::Element* aElement, const nsAString& aPseudoElt, Document* aDocument,
nsComputedDOMStyle::StyleType aStyleType, mozilla::ErrorResult&) {
auto [pseudo, functionalPseudoParameter] =
nsCSSPseudoElements::ParsePseudoElement(aPseudoElt,
CSSEnabledState::ForAllContent);
auto returnEmpty = nsComputedDOMStyle::AlwaysReturnEmptyStyle::No;
if (!pseudo) {
if (!aPseudoElt.IsEmpty() && aPseudoElt.First() == u':') {
returnEmpty = nsComputedDOMStyle::AlwaysReturnEmptyStyle::Yes;
}
pseudo.emplace(PseudoStyleType::NotPseudo);
}
return MakeAndAddRef<nsComputedDOMStyle>(aElement, *pseudo,
functionalPseudoParameter, aDocument,
aStyleType, returnEmpty);
}
static nsDOMCSSValueList* GetROCSSValueList(bool aCommaDelimited) {
return new nsDOMCSSValueList(aCommaDelimited);
}
static const Element* GetRenderedElement(const Element* aElement,
PseudoStyleType aPseudo) {
if (aPseudo == PseudoStyleType::NotPseudo) {
return aElement;
}
if (aPseudo == PseudoStyleType::before) {
return nsLayoutUtils::GetBeforePseudo(aElement);
}
if (aPseudo == PseudoStyleType::after) {
return nsLayoutUtils::GetAfterPseudo(aElement);
}
if (aPseudo == PseudoStyleType::marker) {
return nsLayoutUtils::GetMarkerPseudo(aElement);
}
return nullptr;
}
// Whether aDocument needs to restyle for aElement
static bool ElementNeedsRestyle(Element* aElement, PseudoStyleType aPseudo,
bool aMayNeedToFlushLayout) {
const Document* doc = aElement->GetComposedDoc();
if (!doc) {
// If the element is out of the document we don't return styles for it, so
// nothing to do.
return false;
}
PresShell* presShell = doc->GetPresShell();
if (!presShell) {
// If there's no pres-shell we'll just either mint a new style from our
// caller document, or return no styles, so nothing to do (unless our owner
// element needs to get restyled, which could cause us to gain a pres shell,
// but the caller checks that).
return false;
}
// Unfortunately we don't know if the sheet change affects mElement or not, so
// just assume it will and that we need to flush normally.
ServoStyleSet* styleSet = presShell->StyleSet();
if (styleSet->StyleSheetsHaveChanged()) {
return true;
}
nsPresContext* presContext = presShell->GetPresContext();
MOZ_ASSERT(presContext);
// Pending media query updates can definitely change style on the element. For
// example, if you change the zoom factor and then call getComputedStyle, you
// should be able to observe the style with the new media queries.
//
// TODO(emilio): Does this need to also check the user font set? (it affects
// ch / ex units).
if (presContext->HasPendingMediaQueryUpdates()) {
// So gotta flush.
return true;
}
// If the pseudo-element is animating, make sure to flush.
if (aElement->MayHaveAnimations() && aPseudo != PseudoStyleType::NotPseudo &&
AnimationUtils::IsSupportedPseudoForAnimations(aPseudo)) {
if (EffectSet::Get(aElement, aPseudo)) {
return true;
}
}
// For Servo, we need to process the restyle-hint-invalidations first, to
// expand LaterSiblings hint, so that we can look whether ancestors need
// restyling.
RestyleManager* restyleManager = presContext->RestyleManager();
restyleManager->ProcessAllPendingAttributeAndStateInvalidations();
if (!presContext->EffectCompositor()->HasPendingStyleUpdates() &&
!doc->GetServoRestyleRoot()) {
return false;
}
// If there's a pseudo, we need to prefer that element, as the pseudo itself
// may have explicit restyles.
const Element* styledElement = GetRenderedElement(aElement, aPseudo);
// Try to skip the restyle otherwise.
return Servo_HasPendingRestyleAncestor(
styledElement ? styledElement : aElement, aMayNeedToFlushLayout);
}
/**
* An object that represents the ordered set of properties that are exposed on
* an nsComputedDOMStyle object and how their computed values can be obtained.
*/
struct ComputedStyleMap {
friend class nsComputedDOMStyle;
struct Entry {
// Create a pointer-to-member-function type.
using ComputeMethod = already_AddRefed<CSSValue> (nsComputedDOMStyle::*)();
nsCSSPropertyID mProperty;
// Whether the property can ever be exposed in getComputedStyle(). For
// example, @page descriptors implemented as CSS properties or other
// internal properties, would have this flag set to `false`.
bool mCanBeExposed = false;
ComputeMethod mGetter = nullptr;
bool IsEnumerable() const {
return IsEnabled() && !nsCSSProps::IsShorthand(mProperty);
}
bool IsEnabled() const {
return mCanBeExposed &&
nsCSSProps::IsEnabled(mProperty, CSSEnabledState::ForAllContent);
}
};
// This generated file includes definition of kEntries which is typed
// Entry[] and used below, so this #include has to be put here.
#include "nsComputedDOMStyleGenerated.inc"
/**
* Returns the number of properties that should be exposed on an
* nsComputedDOMStyle, ecxluding any disabled properties.
*/
uint32_t Length() {
Update();
return mEnumerablePropertyCount;
}
/**
* Returns the property at the given index in the list of properties
* that should be exposed on an nsComputedDOMStyle, excluding any
* disabled properties.
*/
nsCSSPropertyID PropertyAt(uint32_t aIndex) {
Update();
return kEntries[EntryIndex(aIndex)].mProperty;
}
/**
* Searches for and returns the computed style map entry for the given
* property, or nullptr if the property is not exposed on nsComputedDOMStyle
* or is currently disabled.
*/
const Entry* FindEntryForProperty(nsCSSPropertyID aPropID) {
if (size_t(aPropID) >= ArrayLength(kEntryIndices)) {
MOZ_ASSERT(aPropID == eCSSProperty_UNKNOWN);
return nullptr;
}
MOZ_ASSERT(kEntryIndices[aPropID] < ArrayLength(kEntries));
const auto& entry = kEntries[kEntryIndices[aPropID]];
if (!entry.IsEnabled()) {
return nullptr;
}
return &entry;
}
/**
* Records that mIndexMap needs updating, due to prefs changing that could
* affect the set of properties exposed on an nsComputedDOMStyle.
*/
void MarkDirty() { mEnumerablePropertyCount = 0; }
// The member variables are public so that we can use an initializer in
// nsComputedDOMStyle::GetComputedStyleMap. Use the member functions
// above to get information from this object.
/**
* The number of properties that should be exposed on an nsComputedDOMStyle.
* This will be less than eComputedStyleProperty_COUNT if some property
* prefs are disabled. A value of 0 indicates that it and mIndexMap are out
* of date.
*/
uint32_t mEnumerablePropertyCount = 0;
/**
* A map of indexes on the nsComputedDOMStyle object to indexes into kEntries.
*/
uint32_t mIndexMap[ArrayLength(kEntries)];
private:
/**
* Returns whether mEnumerablePropertyCount and mIndexMap are out of date.
*/
bool IsDirty() { return mEnumerablePropertyCount == 0; }
/**
* Updates mEnumerablePropertyCount and mIndexMap to take into account
* properties whose prefs are currently disabled.
*/
void Update();
/**
* Maps an nsComputedDOMStyle indexed getter index to an index into kEntries.
*/
uint32_t EntryIndex(uint32_t aIndex) const {
MOZ_ASSERT(aIndex < mEnumerablePropertyCount);
return mIndexMap[aIndex];
}
};
constexpr ComputedStyleMap::Entry
ComputedStyleMap::kEntries[ArrayLength(kEntries)];
constexpr size_t ComputedStyleMap::kEntryIndices[ArrayLength(kEntries)];
void ComputedStyleMap::Update() {
if (!IsDirty()) {
return;
}
uint32_t index = 0;
for (uint32_t i = 0; i < ArrayLength(kEntries); i++) {
if (kEntries[i].IsEnumerable()) {
mIndexMap[index++] = i;
}
}
mEnumerablePropertyCount = index;
}
nsComputedDOMStyle::nsComputedDOMStyle(dom::Element* aElement,
PseudoStyleType aPseudo,
nsAtom* aFunctionalPseudoParameter,
Document* aDocument,
StyleType aStyleType,
AlwaysReturnEmptyStyle aAlwaysEmpty)
: mDocumentWeak(nullptr),
mOuterFrame(nullptr),
mInnerFrame(nullptr),
mPresShell(nullptr),
mPseudo(aPseudo),
mFunctionalPseudoParameter(aFunctionalPseudoParameter),
mStyleType(aStyleType),
mAlwaysReturnEmpty(aAlwaysEmpty) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(aDocument);
// TODO(emilio, bug 548397, https://github.com/w3c/csswg-drafts/issues/2403):
// Should use aElement->OwnerDoc() instead.
mDocumentWeak = aDocument;
mElement = aElement;
SetEnabledCallbacks(nsIMutationObserver::kParentChainChanged);
}
nsComputedDOMStyle::~nsComputedDOMStyle() {
MOZ_ASSERT(!mResolvedComputedStyle,
"Should have called ClearComputedStyle() during last release.");
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsComputedDOMStyle)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsComputedDOMStyle)
tmp->ClearComputedStyle(); // remove observer before clearing mElement
NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsComputedDOMStyle)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
// We can skip the nsComputedDOMStyle if it has no wrapper and its
// element is skippable, because it will have no outgoing edges, so
// it can't be part of a cycle.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsComputedDOMStyle)
if (!tmp->GetWrapperPreserveColor()) {
return !tmp->mElement ||
mozilla::dom::FragmentOrElement::CanSkip(tmp->mElement, true);
}
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsComputedDOMStyle)
if (!tmp->GetWrapperPreserveColor()) {
return !tmp->mElement ||
mozilla::dom::FragmentOrElement::CanSkipInCC(tmp->mElement);
}
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsComputedDOMStyle)
if (!tmp->GetWrapperPreserveColor()) {
return !tmp->mElement ||
mozilla::dom::FragmentOrElement::CanSkipThis(tmp->mElement);
}
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
// QueryInterface implementation for nsComputedDOMStyle
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsComputedDOMStyle)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_END_INHERITING(nsDOMCSSDeclaration)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsComputedDOMStyle)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsComputedDOMStyle,
ClearComputedStyle())
void nsComputedDOMStyle::GetPropertyValue(const nsCSSPropertyID aPropID,
nsACString& aValue) {
return GetPropertyValue(aPropID, EmptyCString(), aValue);
}
void nsComputedDOMStyle::SetPropertyValue(const nsCSSPropertyID aPropID,
const nsACString& aValue,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
aRv.ThrowNoModificationAllowedError(nsPrintfCString(
"Can't set value for property '%s' in computed style",
PromiseFlatCString(nsCSSProps::GetStringValue(aPropID)).get()));
}
void nsComputedDOMStyle::GetCssText(nsACString& aCssText) {
aCssText.Truncate();
}
void nsComputedDOMStyle::SetCssText(const nsACString& aCssText,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
aRv.ThrowNoModificationAllowedError("Can't set cssText on computed style");
}
uint32_t nsComputedDOMStyle::Length() {
// Make sure we have up to date style so that we can include custom
// properties.
UpdateCurrentStyleSources(eCSSPropertyExtra_variable);
if (!mComputedStyle) {
return 0;
}
uint32_t length = GetComputedStyleMap()->Length() +
Servo_GetCustomPropertiesCount(mComputedStyle);
ClearCurrentStyleSources();
return length;
}
css::Rule* nsComputedDOMStyle::GetParentRule() { return nullptr; }
void nsComputedDOMStyle::GetPropertyValue(const nsACString& aPropertyName,
nsACString& aReturn) {
nsCSSPropertyID prop = nsCSSProps::LookupProperty(aPropertyName);
GetPropertyValue(prop, aPropertyName, aReturn);
}
void nsComputedDOMStyle::GetPropertyValue(
nsCSSPropertyID aPropID, const nsACString& aMaybeCustomPropertyName,
nsACString& aReturn) {
MOZ_ASSERT(aReturn.IsEmpty());
const ComputedStyleMap::Entry* entry = nullptr;
if (aPropID != eCSSPropertyExtra_variable) {
entry = GetComputedStyleMap()->FindEntryForProperty(aPropID);
if (!entry) {
return;
}
}
UpdateCurrentStyleSources(aPropID);
if (!mComputedStyle) {
return;
}
auto cleanup = mozilla::MakeScopeExit([&] { ClearCurrentStyleSources(); });
if (!entry) {
MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aMaybeCustomPropertyName));
const nsACString& name =
Substring(aMaybeCustomPropertyName, CSS_CUSTOM_NAME_PREFIX_LENGTH);
Servo_GetCustomPropertyValue(mComputedStyle, &name,
mPresShell->StyleSet()->RawData(), &aReturn);
return;
}
if (nsCSSProps::PropHasFlags(aPropID, CSSPropFlags::IsLogical)) {
MOZ_ASSERT(entry);
MOZ_ASSERT(entry->mGetter == &nsComputedDOMStyle::DummyGetter);
DebugOnly<nsCSSPropertyID> logicalProp = aPropID;
aPropID = Servo_ResolveLogicalProperty(aPropID, mComputedStyle);
entry = GetComputedStyleMap()->FindEntryForProperty(aPropID);
MOZ_ASSERT(NeedsToFlushLayout(logicalProp) == NeedsToFlushLayout(aPropID),
"Logical and physical property don't agree on whether layout is "
"needed");
}
if (!nsCSSProps::PropHasFlags(aPropID, CSSPropFlags::SerializedByServo)) {
if (RefPtr<CSSValue> value = (this->*entry->mGetter)()) {
nsAutoString text;
value->GetCssText(text);
CopyUTF16toUTF8(text, aReturn);
}
return;
}
MOZ_ASSERT(entry->mGetter == &nsComputedDOMStyle::DummyGetter);
Servo_GetResolvedValue(mComputedStyle, aPropID,
mPresShell->StyleSet()->RawData(), mElement, &aReturn);
}
/* static */
already_AddRefed<const ComputedStyle> nsComputedDOMStyle::GetComputedStyle(
Element* aElement, PseudoStyleType aPseudo,
nsAtom* aFunctionalPseudoParameter, StyleType aStyleType) {
if (Document* doc = aElement->GetComposedDoc()) {
doc->FlushPendingNotifications(FlushType::Style);
}
return GetComputedStyleNoFlush(aElement, aPseudo, aFunctionalPseudoParameter,
aStyleType);
}
/**
* The following function checks whether we need to explicitly resolve the style
* again, even though we have a style coming from the frame.
*
* This basically checks whether the style is or may be under a ::first-line or
* ::first-letter frame, in which case we can't return the frame style, and we
* need to resolve it. See bug 505515.
*/
static bool MustReresolveStyle(const ComputedStyle* aStyle) {
MOZ_ASSERT(aStyle);
// TODO(emilio): We may want to avoid re-resolving pseudo-element styles
// more often.
return aStyle->HasPseudoElementData() && !aStyle->IsPseudoElement();
}
static bool IsInFlatTree(const Element& aElement) {
const auto* topmost = &aElement;
while (true) {
if (topmost->HasServoData()) {
// If we have styled this element then we know it's in the flat tree.
return true;
}
const Element* parent = topmost->GetFlattenedTreeParentElement();
if (!parent) {
break;
}
topmost = parent;
}
auto* root = topmost->GetFlattenedTreeParentNode();
return root && root->IsDocument();
}
already_AddRefed<const ComputedStyle>
nsComputedDOMStyle::DoGetComputedStyleNoFlush(
const Element* aElement, PseudoStyleType aPseudo,
nsAtom* aFunctionalPseudoParameter, PresShell* aPresShell,
StyleType aStyleType) {
MOZ_ASSERT(aElement, "NULL element");
// If the content has a pres shell, we must use it. Otherwise we'd
// potentially mix rule trees by using the wrong pres shell's style
// set. Using the pres shell from the content also means that any
// content that's actually *in* a document will get the style from the
// correct document.
PresShell* presShell = nsContentUtils::GetPresShellForContent(aElement);
bool inDocWithShell = true;
if (!presShell) {
inDocWithShell = false;
presShell = aPresShell;
if (!presShell) {
return nullptr;
}
}
MOZ_ASSERT(aPseudo == PseudoStyleType::NotPseudo ||
PseudoStyle::IsPseudoElement(aPseudo));
if (!aElement->IsInComposedDoc()) {
// Don't return styles for disconnected elements, that makes no sense. This
// can only happen with a non-null presShell for cross-document calls.
return nullptr;
}
if (!IsInFlatTree(*aElement)) {
return nullptr;
}
// XXX the !aElement->IsHTMLElement(nsGkAtoms::area)
// check is needed due to bug 135040 (to avoid using
// mPrimaryFrame). Remove it once that's fixed.
if (inDocWithShell && aStyleType == StyleType::All &&
!aElement->IsHTMLElement(nsGkAtoms::area)) {
if (const Element* element = GetRenderedElement(aElement, aPseudo)) {
if (element->HasServoData()) {
const ComputedStyle* result =
Servo_Element_GetMaybeOutOfDateStyle(element);
return do_AddRef(result);
}
}
}
// No frame has been created, or we have a pseudo, or we're looking
// for the default style, so resolve the style ourselves.
ServoStyleSet* styleSet = presShell->StyleSet();
StyleRuleInclusion rules = aStyleType == StyleType::DefaultOnly
? StyleRuleInclusion::DefaultOnly
: StyleRuleInclusion::All;
RefPtr<ComputedStyle> result = styleSet->ResolveStyleLazily(
*aElement, aPseudo, aFunctionalPseudoParameter, rules);
return result.forget();
}
already_AddRefed<const ComputedStyle>
nsComputedDOMStyle::GetUnanimatedComputedStyleNoFlush(
Element* aElement, PseudoStyleType aPseudo,
nsAtom* aFunctionalPseudoParameter) {
RefPtr<const ComputedStyle> style =
GetComputedStyleNoFlush(aElement, aPseudo, aFunctionalPseudoParameter);
if (!style) {
return nullptr;
}
PresShell* presShell = aElement->OwnerDoc()->GetPresShell();
MOZ_ASSERT(presShell,
"How in the world did we get a style a few lines above?");
Element* elementOrPseudoElement =
AnimationUtils::GetElementForRestyle(aElement, aPseudo);
if (!elementOrPseudoElement) {
return nullptr;
}
return presShell->StyleSet()->GetBaseContextForElement(elementOrPseudoElement,
style);
}
nsMargin nsComputedDOMStyle::GetAdjustedValuesForBoxSizing() {
// We want the width/height of whatever parts 'width' or 'height' controls,
// which can be different depending on the value of the 'box-sizing' property.
const nsStylePosition* stylePos = StylePosition();
nsMargin adjustment;
if (stylePos->mBoxSizing == StyleBoxSizing::Border) {
adjustment = mInnerFrame->GetUsedBorderAndPadding();
}
return adjustment;
}
static void AddImageURL(nsIURI& aURI, nsTArray<nsCString>& aURLs) {
nsCString spec;
nsresult rv = aURI.GetSpec(spec);
if (NS_FAILED(rv)) {
return;
}
aURLs.AppendElement(std::move(spec));
}
static void AddImageURL(const StyleComputedUrl& aURL,
nsTArray<nsCString>& aURLs) {
if (aURL.IsLocalRef()) {
return;
}
if (nsIURI* uri = aURL.GetURI()) {
AddImageURL(*uri, aURLs);
}
}
static void AddImageURL(const StyleImage& aImage, nsTArray<nsCString>& aURLs) {
if (auto* urlValue = aImage.GetImageRequestURLValue()) {
AddImageURL(*urlValue, aURLs);
}
}
static void AddImageURL(const StyleShapeOutside& aShapeOutside,
nsTArray<nsCString>& aURLs) {
if (aShapeOutside.IsImage()) {
AddImageURL(aShapeOutside.AsImage(), aURLs);
}
}
static void AddImageURL(const StyleClipPath& aClipPath,
nsTArray<nsCString>& aURLs) {
if (aClipPath.IsUrl()) {
AddImageURL(aClipPath.AsUrl(), aURLs);
}
}
static void AddImageURLs(const nsStyleImageLayers& aLayers,
nsTArray<nsCString>& aURLs) {
for (auto i : IntegerRange(aLayers.mLayers.Length())) {
AddImageURL(aLayers.mLayers[i].mImage, aURLs);
}
}
static void CollectImageURLsForProperty(nsCSSPropertyID aProp,
const ComputedStyle& aStyle,
nsTArray<nsCString>& aURLs) {
if (nsCSSProps::IsShorthand(aProp)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aProp,
CSSEnabledState::ForAllContent) {
CollectImageURLsForProperty(*p, aStyle, aURLs);
}
return;
}
switch (aProp) {
case eCSSProperty_cursor:
for (auto& image : aStyle.StyleUI()->Cursor().images.AsSpan()) {
AddImageURL(image.image, aURLs);
}
break;
case eCSSProperty_background_image:
AddImageURLs(aStyle.StyleBackground()->mImage, aURLs);
break;
case eCSSProperty_mask_clip:
AddImageURLs(aStyle.StyleSVGReset()->mMask, aURLs);
break;
case eCSSProperty_list_style_image: {
const auto& image = aStyle.StyleList()->mListStyleImage;
if (image.IsUrl()) {
AddImageURL(image.AsUrl(), aURLs);
}
break;
}
case eCSSProperty_border_image_source:
AddImageURL(aStyle.StyleBorder()->mBorderImageSource, aURLs);
break;
case eCSSProperty_clip_path:
AddImageURL(aStyle.StyleSVGReset()->mClipPath, aURLs);
break;
case eCSSProperty_shape_outside:
AddImageURL(aStyle.StyleDisplay()->mShapeOutside, aURLs);
break;
default:
break;
}
}
float nsComputedDOMStyle::UsedFontSize() {
UpdateCurrentStyleSources(eCSSProperty_font_size);
if (!mComputedStyle) {
return -1.0;
}
return mComputedStyle->StyleFont()->mFont.size.ToCSSPixels();
}
void nsComputedDOMStyle::GetCSSImageURLs(const nsACString& aPropertyName,
nsTArray<nsCString>& aImageURLs,
mozilla::ErrorResult& aRv) {
nsCSSPropertyID prop = nsCSSProps::LookupProperty(aPropertyName);
if (prop == eCSSProperty_UNKNOWN) {
// Note: not using nsPrintfCString here in case aPropertyName contains
// nulls.
aRv.ThrowSyntaxError("Invalid property name '"_ns + aPropertyName + "'"_ns);
return;
}
UpdateCurrentStyleSources(prop);
if (!mComputedStyle) {
return;
}
CollectImageURLsForProperty(prop, *mComputedStyle, aImageURLs);
ClearCurrentStyleSources();
}
// nsDOMCSSDeclaration abstract methods which should never be called
// on a nsComputedDOMStyle object, but must be defined to avoid
// compile errors.
DeclarationBlock* nsComputedDOMStyle::GetOrCreateCSSDeclaration(
Operation aOperation, DeclarationBlock** aCreated) {
MOZ_CRASH("called nsComputedDOMStyle::GetCSSDeclaration");
}
nsresult nsComputedDOMStyle::SetCSSDeclaration(DeclarationBlock*,
MutationClosureData*) {
MOZ_CRASH("called nsComputedDOMStyle::SetCSSDeclaration");
}
Document* nsComputedDOMStyle::DocToUpdate() {
MOZ_CRASH("called nsComputedDOMStyle::DocToUpdate");
}
nsDOMCSSDeclaration::ParsingEnvironment
nsComputedDOMStyle::GetParsingEnvironment(
nsIPrincipal* aSubjectPrincipal) const {
MOZ_CRASH("called nsComputedDOMStyle::GetParsingEnvironment");
}
void nsComputedDOMStyle::ClearComputedStyle() {
if (mResolvedComputedStyle) {
mResolvedComputedStyle = false;
mElement->RemoveMutationObserver(this);
}
mComputedStyle = nullptr;
}
void nsComputedDOMStyle::SetResolvedComputedStyle(
RefPtr<const ComputedStyle>&& aContext, uint64_t aGeneration) {
if (!mResolvedComputedStyle) {
mResolvedComputedStyle = true;
mElement->AddMutationObserver(this);
}
mComputedStyle = aContext;
mComputedStyleGeneration = aGeneration;
mPresShellId = mPresShell->GetPresShellId();
}
void nsComputedDOMStyle::SetFrameComputedStyle(mozilla::ComputedStyle* aStyle,
uint64_t aGeneration) {
ClearComputedStyle();
mComputedStyle = aStyle;
mComputedStyleGeneration = aGeneration;
mPresShellId = mPresShell->GetPresShellId();
}
static bool MayNeedToFlushLayout(nsCSSPropertyID aPropID) {
switch (aPropID) {
case eCSSProperty_width:
case eCSSProperty_height:
case eCSSProperty_block_size:
case eCSSProperty_inline_size:
case eCSSProperty_line_height:
case eCSSProperty_grid_template_rows:
case eCSSProperty_grid_template_columns:
case eCSSProperty_perspective_origin:
case eCSSProperty_transform_origin:
case eCSSProperty_transform:
case eCSSProperty_border_top_width:
case eCSSProperty_border_bottom_width:
case eCSSProperty_border_left_width:
case eCSSProperty_border_right_width:
case eCSSProperty_border_block_start_width:
case eCSSProperty_border_block_end_width:
case eCSSProperty_border_inline_start_width:
case eCSSProperty_border_inline_end_width:
case eCSSProperty_top:
case eCSSProperty_right:
case eCSSProperty_bottom:
case eCSSProperty_left:
case eCSSProperty_inset_block_start:
case eCSSProperty_inset_block_end:
case eCSSProperty_inset_inline_start:
case eCSSProperty_inset_inline_end:
case eCSSProperty_padding_top:
case eCSSProperty_padding_right:
case eCSSProperty_padding_bottom:
case eCSSProperty_padding_left:
case eCSSProperty_padding_block_start:
case eCSSProperty_padding_block_end:
case eCSSProperty_padding_inline_start:
case eCSSProperty_padding_inline_end:
case eCSSProperty_margin_top:
case eCSSProperty_margin_right:
case eCSSProperty_margin_bottom:
case eCSSProperty_margin_left:
case eCSSProperty_margin_block_start:
case eCSSProperty_margin_block_end:
case eCSSProperty_margin_inline_start:
case eCSSProperty_margin_inline_end:
return true;
default:
return false;
}
}
bool nsComputedDOMStyle::NeedsToFlushStyle(nsCSSPropertyID aPropID) const {
bool mayNeedToFlushLayout = MayNeedToFlushLayout(aPropID);
// We always compute styles from the element's owner document.
if (ElementNeedsRestyle(mElement, mPseudo, mayNeedToFlushLayout)) {
return true;
}
Document* doc = mElement->OwnerDoc();
// If parent document is there, also needs to check if there is some change
// that needs to flush this document (e.g. size change for iframe).
while (doc->StyleOrLayoutObservablyDependsOnParentDocumentLayout()) {
if (Element* element = doc->GetEmbedderElement()) {
if (ElementNeedsRestyle(element, PseudoStyleType::NotPseudo,
mayNeedToFlushLayout)) {
return true;
}
}
doc = doc->GetInProcessParentDocument();
}
return false;
}
static bool IsNonReplacedInline(nsIFrame* aFrame) {
// FIXME: this should be IsInlineInsideStyle() since width/height
// doesn't apply to ruby boxes.
return aFrame->StyleDisplay()->IsInlineFlow() && !aFrame->IsReplaced() &&
!aFrame->IsFieldSetFrame() && !aFrame->IsBlockFrame() &&
!aFrame->IsScrollContainerFrame() &&
!aFrame->IsColumnSetWrapperFrame();
}
static Side SideForPaddingOrMarginOrInsetProperty(nsCSSPropertyID aPropID) {
switch (aPropID) {
case eCSSProperty_top:
case eCSSProperty_margin_top:
case eCSSProperty_padding_top:
return eSideTop;
case eCSSProperty_right:
case eCSSProperty_margin_right:
case eCSSProperty_padding_right:
return eSideRight;
case eCSSProperty_bottom:
case eCSSProperty_margin_bottom:
case eCSSProperty_padding_bottom:
return eSideBottom;
case eCSSProperty_left:
case eCSSProperty_margin_left:
case eCSSProperty_padding_left:
return eSideLeft;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected property");
return eSideTop;
}
}
static bool PaddingNeedsUsedValue(const LengthPercentage& aValue,
const ComputedStyle& aStyle) {
return !aValue.ConvertsToLength() || aStyle.StyleDisplay()->HasAppearance();
}
bool nsComputedDOMStyle::NeedsToFlushLayout(nsCSSPropertyID aPropID) const {
MOZ_ASSERT(aPropID != eCSSProperty_UNKNOWN);
if (aPropID == eCSSPropertyExtra_variable) {
return false;
}
nsIFrame* outerFrame = GetOuterFrame();
if (!outerFrame) {
return false;
}
nsIFrame* frame = nsLayoutUtils::GetStyleFrame(outerFrame);
auto* style = frame->Style();
if (nsCSSProps::PropHasFlags(aPropID, CSSPropFlags::IsLogical)) {
aPropID = Servo_ResolveLogicalProperty(aPropID, style);
}
switch (aPropID) {
case eCSSProperty_width:
case eCSSProperty_height:
return !IsNonReplacedInline(frame);
case eCSSProperty_line_height:
return frame->StyleFont()->mLineHeight.IsMozBlockHeight();
case eCSSProperty_grid_template_rows:
case eCSSProperty_grid_template_columns:
return !!nsGridContainerFrame::GetGridContainerFrame(frame);
case eCSSProperty_perspective_origin:
return style->StyleDisplay()->mPerspectiveOrigin.HasPercent();
case eCSSProperty_transform_origin:
return style->StyleDisplay()->mTransformOrigin.HasPercent();
case eCSSProperty_transform:
return style->StyleDisplay()->mTransform.HasPercent();
case eCSSProperty_border_top_width:
case eCSSProperty_border_bottom_width:
case eCSSProperty_border_left_width:
case eCSSProperty_border_right_width:
// FIXME(emilio): This should return false per spec (bug 1551000), but
// themed borders don't make that easy, so for now flush for that case.
//
// TODO(emilio): If we make GetUsedBorder() stop returning 0 for an
// unreflowed frame, or something of that sort, then we can stop flushing
// layout for themed frames.
return style->StyleDisplay()->HasAppearance();
case eCSSProperty_top:
case eCSSProperty_right:
case eCSSProperty_bottom:
case eCSSProperty_left:
// Doing better than this is actually hard.
return style->StyleDisplay()->mPosition != StylePositionProperty::Static;
case eCSSProperty_padding_top:
case eCSSProperty_padding_right:
case eCSSProperty_padding_bottom:
case eCSSProperty_padding_left: {
Side side = SideForPaddingOrMarginOrInsetProperty(aPropID);
// Theming can override used padding, sigh.
//
// TODO(emilio): If we make GetUsedPadding() stop returning 0 for an
// unreflowed frame, or something of that sort, then we can stop flushing
// layout for themed frames.
return PaddingNeedsUsedValue(style->StylePadding()->mPadding.Get(side),
*style);
}
case eCSSProperty_margin_top:
case eCSSProperty_margin_right:
case eCSSProperty_margin_bottom:
case eCSSProperty_margin_left: {
// NOTE(emilio): This is dubious, but matches other browsers.
// See https://github.com/w3c/csswg-drafts/issues/2328
Side side = SideForPaddingOrMarginOrInsetProperty(aPropID);
return !style->StyleMargin()->mMargin.Get(side).ConvertsToLength();
}
default:
return false;
}
}
bool nsComputedDOMStyle::NeedsToFlushLayoutForContainerQuery() const {
const auto* outerFrame = GetOuterFrame();
if (!outerFrame) {
return false;
}
const auto* innerFrame = nsLayoutUtils::GetStyleFrame(outerFrame);
MOZ_ASSERT(innerFrame, "No valid inner frame?");
// It's possible that potential containers are styled but not yet reflowed,
// i.e. They don't have a correct size, which makes any container query
// evaluation against them invalid.
return innerFrame->HasUnreflowedContainerQueryAncestor();
}
void nsComputedDOMStyle::Flush(Document& aDocument, FlushType aFlushType) {
MOZ_ASSERT(mElement->IsInComposedDoc());
MOZ_ASSERT(mDocumentWeak == &aDocument);
if (MOZ_UNLIKELY(&aDocument != mElement->OwnerDoc())) {
aDocument.FlushPendingNotifications(aFlushType);
}
// This performs the flush, and also guarantees that content-visibility:
// hidden elements get laid out, if needed.
mElement->GetPrimaryFrame(aFlushType);
}
nsIFrame* nsComputedDOMStyle::GetOuterFrame() const {
if (mPseudo == PseudoStyleType::NotPseudo) {
return mElement->GetPrimaryFrame();
}
nsAtom* property = nullptr;
if (mPseudo == PseudoStyleType::before) {
property = nsGkAtoms::beforePseudoProperty;
} else if (mPseudo == PseudoStyleType::after) {
property = nsGkAtoms::afterPseudoProperty;
} else if (mPseudo == PseudoStyleType::marker) {
property = nsGkAtoms::markerPseudoProperty;
}
if (!property) {
return nullptr;
}
auto* pseudo = static_cast<Element*>(mElement->GetProperty(property));
return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}
void nsComputedDOMStyle::UpdateCurrentStyleSources(nsCSSPropertyID aPropID) {
nsCOMPtr<Document> document(mDocumentWeak);
if (!document) {
ClearComputedStyle();
return;
}
// We don't return styles for disconnected elements anymore, so don't go
// through the trouble of flushing or what not.
//
// TODO(emilio): We may want to return earlier for elements outside of the
// flat tree too: https://github.com/w3c/csswg-drafts/issues/1964
if (!mElement->IsInComposedDoc()) {
ClearComputedStyle();
return;
}
if (mAlwaysReturnEmpty == AlwaysReturnEmptyStyle::Yes) {
ClearComputedStyle();
return;
}
DebugOnly<bool> didFlush = false;
if (NeedsToFlushStyle(aPropID)) {
didFlush = true;
// We look at the frame in NeedsToFlushLayout, so flush frames, not only
// styles.
Flush(*document, FlushType::Frames);
}
const bool needsToFlushLayoutForProp = NeedsToFlushLayout(aPropID);
if (needsToFlushLayoutForProp || NeedsToFlushLayoutForContainerQuery()) {
MOZ_ASSERT_IF(needsToFlushLayoutForProp, MayNeedToFlushLayout(aPropID));
didFlush = true;
Flush(*document, FlushType::Layout);
#ifdef DEBUG
mFlushedPendingReflows = true;
#endif
} else {
#ifdef DEBUG
mFlushedPendingReflows = false;
#endif
}
mPresShell = document->GetPresShell();
if (!mPresShell || !mPresShell->GetPresContext()) {
ClearComputedStyle();
return;
}
// We need to use GetUndisplayedRestyleGeneration instead of
// GetRestyleGeneration, because the caching of mComputedStyle is an
// optimization that is useful only for displayed elements.
// For undisplayed elements we need to take into account any DOM changes that
// might cause a restyle, because Servo will not increase the generation for
// undisplayed elements.
uint64_t currentGeneration =
mPresShell->GetPresContext()->GetUndisplayedRestyleGeneration();
if (mComputedStyle && mComputedStyleGeneration == currentGeneration &&
mPresShellId == mPresShell->GetPresShellId()) {
// Our cached style is still valid.
return;
}
mComputedStyle = nullptr;
// XXX the !mElement->IsHTMLElement(nsGkAtoms::area) check is needed due to
// bug 135040 (to avoid using mPrimaryFrame). Remove it once that's fixed.
if (mStyleType == StyleType::All &&
!mElement->IsHTMLElement(nsGkAtoms::area)) {
mOuterFrame = GetOuterFrame();
mInnerFrame = mOuterFrame;
if (mOuterFrame) {
mInnerFrame = nsLayoutUtils::GetStyleFrame(mOuterFrame);
SetFrameComputedStyle(mInnerFrame->Style(), currentGeneration);
NS_ASSERTION(mComputedStyle, "Frame without style?");
}
}
if (!mComputedStyle || MustReresolveStyle(mComputedStyle)) {
PresShell* presShellForContent = mElement->OwnerDoc()->GetPresShell();
// Need to resolve a style.
RefPtr<const ComputedStyle> resolvedComputedStyle =
DoGetComputedStyleNoFlush(
mElement, mPseudo, mFunctionalPseudoParameter,
presShellForContent ? presShellForContent : mPresShell, mStyleType);
if (!resolvedComputedStyle) {
ClearComputedStyle();
return;
}
// No need to re-get the generation, even though GetComputedStyle
// will flush, since we flushed style at the top of this function.
// We don't need to check this if we only flushed the parent.
NS_ASSERTION(
!didFlush ||
currentGeneration ==
mPresShell->GetPresContext()->GetUndisplayedRestyleGeneration(),
"why should we have flushed style again?");
SetResolvedComputedStyle(std::move(resolvedComputedStyle),
currentGeneration);
NS_ASSERTION(mPseudo != PseudoStyleType::NotPseudo ||
!mComputedStyle->HasPseudoElementData(),
"should not have pseudo-element data");
}
// mExposeVisitedStyle is set to true only by testing APIs that
// require chrome privilege.
MOZ_ASSERT(!mExposeVisitedStyle || nsContentUtils::IsCallerChrome(),
"mExposeVisitedStyle set incorrectly");
if (mExposeVisitedStyle && mComputedStyle->RelevantLinkVisited()) {
if (const auto* styleIfVisited = mComputedStyle->GetStyleIfVisited()) {
mComputedStyle = styleIfVisited;
}
}
}
void nsComputedDOMStyle::ClearCurrentStyleSources() {
// Release the current style if we got it off the frame.
//
// For a style we resolved, keep it around so that we can re-use it next time
// this object is queried, but not if it-s a re-resolved style because we were
// inside a pseudo-element.
if (!mResolvedComputedStyle || mOuterFrame) {
ClearComputedStyle();
}
mOuterFrame = nullptr;
mInnerFrame = nullptr;
mPresShell = nullptr;
}
void nsComputedDOMStyle::RemoveProperty(const nsACString& aPropertyName,
nsACString& aReturn, ErrorResult& aRv) {
// Note: not using nsPrintfCString here in case aPropertyName contains
// nulls.
aRv.ThrowNoModificationAllowedError("Can't remove property '"_ns +
aPropertyName +
"' from computed style"_ns);
}
void nsComputedDOMStyle::GetPropertyPriority(const nsACString& aPropertyName,
nsACString& aReturn) {
aReturn.Truncate();
}
void nsComputedDOMStyle::SetProperty(const nsACString& aPropertyName,
const nsACString& aValue,
const nsACString& aPriority,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
// Note: not using nsPrintfCString here in case aPropertyName contains
// nulls.
aRv.ThrowNoModificationAllowedError("Can't set value for property '"_ns +
aPropertyName + "' in computed style"_ns);
}
void nsComputedDOMStyle::IndexedGetter(uint32_t aIndex, bool& aFound,
nsACString& aPropName) {
ComputedStyleMap* map = GetComputedStyleMap();
uint32_t length = map->Length();
if (aIndex < length) {
aFound = true;
aPropName.Assign(nsCSSProps::GetStringValue(map->PropertyAt(aIndex)));
return;
}
// Custom properties are exposed with indexed properties just after all
// of the built-in properties.
UpdateCurrentStyleSources(eCSSPropertyExtra_variable);
if (!mComputedStyle) {
aFound = false;
return;
}
uint32_t count = Servo_GetCustomPropertiesCount(mComputedStyle);
const uint32_t index = aIndex - length;
if (index < count) {
aFound = true;
aPropName.AssignLiteral("--");
if (nsAtom* atom = Servo_GetCustomPropertyNameAt(mComputedStyle, index)) {
aPropName.Append(nsAtomCString(atom));
}
} else {
aFound = false;
}
ClearCurrentStyleSources();
}
// Property getters...
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBottom() {
return GetOffsetWidthFor(eSideBottom);
}
static Position MaybeResolvePositionForTransform(const LengthPercentage& aX,
const LengthPercentage& aY,
nsIFrame* aInnerFrame) {
if (!aInnerFrame) {
return {aX, aY};
}
nsStyleTransformMatrix::TransformReferenceBox refBox(aInnerFrame);
CSSPoint p = nsStyleTransformMatrix::Convert2DPosition(aX, aY, refBox);
return {LengthPercentage::FromPixels(p.x), LengthPercentage::FromPixels(p.y)};
}
/* Convert the stored representation into a list of two values and then hand
* it back.
*/
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetTransformOrigin() {
/* Store things as a value list */
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(false);
/* Now, get the values. */
const auto& origin = StyleDisplay()->mTransformOrigin;
auto position = MaybeResolvePositionForTransform(
origin.horizontal, origin.vertical, mInnerFrame);
SetValueToPosition(position, valueList);
if (!origin.depth.IsZero()) {
auto depth = MakeRefPtr<nsROCSSPrimitiveValue>();
depth->SetPixels(origin.depth.ToCSSPixels());
valueList->AppendCSSValue(depth.forget());
}
return valueList.forget();
}
/* Convert the stored representation into a list of two values and then hand
* it back.
*/
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetPerspectiveOrigin() {
/* Store things as a value list */
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(false);
/* Now, get the values. */
const auto& origin = StyleDisplay()->mPerspectiveOrigin;
auto position = MaybeResolvePositionForTransform(
origin.horizontal, origin.vertical, mInnerFrame);
SetValueToPosition(position, valueList);
return valueList.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetTransform() {
const nsStyleDisplay* display = StyleDisplay();
return GetTransformValue(display->mTransform);
}
/* static */
already_AddRefed<nsROCSSPrimitiveValue> nsComputedDOMStyle::MatrixToCSSValue(
const mozilla::gfx::Matrix4x4& matrix) {
bool is3D = !matrix.Is2D();
nsAutoString resultString(u"matrix"_ns);
if (is3D) {
resultString.AppendLiteral("3d");
}
resultString.Append('(');
resultString.AppendFloat(matrix._11);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._12);
resultString.AppendLiteral(", ");
if (is3D) {
resultString.AppendFloat(matrix._13);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._14);
resultString.AppendLiteral(", ");
}
resultString.AppendFloat(matrix._21);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._22);
resultString.AppendLiteral(", ");
if (is3D) {
resultString.AppendFloat(matrix._23);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._24);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._31);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._32);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._33);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._34);
resultString.AppendLiteral(", ");
}
resultString.AppendFloat(matrix._41);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._42);
if (is3D) {
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._43);
resultString.AppendLiteral(", ");
resultString.AppendFloat(matrix._44);
}
resultString.Append(')');
/* Create a value to hold our result. */
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString(resultString);
return val.forget();
}
already_AddRefed<nsROCSSPrimitiveValue> nsComputedDOMStyle::AppUnitsToCSSValue(
nscoord aAppUnits) {
return PixelsToCSSValue(CSSPixel::FromAppUnits(aAppUnits));
}
already_AddRefed<nsROCSSPrimitiveValue> nsComputedDOMStyle::PixelsToCSSValue(
float aPixels) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToPixels(val, aPixels);
return val.forget();
}
void nsComputedDOMStyle::SetValueToPixels(nsROCSSPrimitiveValue* aValue,
float aPixels) {
MOZ_ASSERT(mComputedStyle);
aValue->SetPixels(mComputedStyle->EffectiveZoom().Unzoom(aPixels));
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMozOsxFontSmoothing() {
if (nsContentUtils::ShouldResistFingerprinting(
mPresShell->GetPresContext()->GetDocShell(),
RFPTarget::DOMStyleOsxFontSmoothing)) {
return nullptr;
}
nsAutoCString result;
mComputedStyle->GetComputedPropertyValue(eCSSProperty__moz_osx_font_smoothing,
result);
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString(result);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetImageLayerPosition(
const nsStyleImageLayers& aLayers) {
if (aLayers.mPositionXCount != aLayers.mPositionYCount) {
// No value to return. We can't express this combination of
// values as a shorthand.
return nullptr;
}
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(true);
for (uint32_t i = 0, i_end = aLayers.mPositionXCount; i < i_end; ++i) {
RefPtr<nsDOMCSSValueList> itemList = GetROCSSValueList(false);
SetValueToPosition(aLayers.mLayers[i].mPosition, itemList);
valueList->AppendCSSValue(itemList.forget());
}
return valueList.forget();
}
void nsComputedDOMStyle::SetValueToPosition(const Position& aPosition,
nsDOMCSSValueList* aValueList) {
auto valX = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToLengthPercentage(valX, aPosition.horizontal, false);
aValueList->AppendCSSValue(valX.forget());
auto valY = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToLengthPercentage(valY, aPosition.vertical, false);
aValueList->AppendCSSValue(valY.forget());
}
enum class Brackets { No, Yes };
static void AppendGridLineNames(nsACString& aResult,
Span<const StyleCustomIdent> aLineNames,
Brackets aBrackets) {
if (aLineNames.IsEmpty()) {
if (aBrackets == Brackets::Yes) {
aResult.AppendLiteral("[]");
}
return;
}
uint32_t numLines = aLineNames.Length();
if (aBrackets == Brackets::Yes) {
aResult.Append('[');
}
for (uint32_t i = 0;;) {
// TODO: Maybe use servo to do this and avoid the silly utf16->utf8 dance?
nsAutoString name;
nsStyleUtil::AppendEscapedCSSIdent(
nsDependentAtomString(aLineNames[i].AsAtom()), name);
AppendUTF16toUTF8(name, aResult);
if (++i == numLines) {
break;
}
aResult.Append(' ');
}
if (aBrackets == Brackets::Yes) {
aResult.Append(']');
}
}
static void AppendGridLineNames(nsDOMCSSValueList* aValueList,
Span<const StyleCustomIdent> aLineNames,
bool aSuppressEmptyList = true) {
if (aLineNames.IsEmpty() && aSuppressEmptyList) {
return;
}
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
nsAutoCString lineNamesString;
AppendGridLineNames(lineNamesString, aLineNames, Brackets::Yes);
val->SetString(lineNamesString);
aValueList->AppendCSSValue(val.forget());
}
static void AppendGridLineNames(nsDOMCSSValueList* aValueList,
Span<const StyleCustomIdent> aLineNames1,
Span<const StyleCustomIdent> aLineNames2) {
if (aLineNames1.IsEmpty() && aLineNames2.IsEmpty()) {
return;
}
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
nsAutoCString lineNamesString;
lineNamesString.Assign('[');
if (!aLineNames1.IsEmpty()) {
AppendGridLineNames(lineNamesString, aLineNames1, Brackets::No);
}
if (!aLineNames2.IsEmpty()) {
if (!aLineNames1.IsEmpty()) {
lineNamesString.Append(' ');
}
AppendGridLineNames(lineNamesString, aLineNames2, Brackets::No);
}
lineNamesString.Append(']');
val->SetString(lineNamesString);
aValueList->AppendCSSValue(val.forget());
}
void nsComputedDOMStyle::SetValueToTrackBreadth(
nsROCSSPrimitiveValue* aValue, const StyleTrackBreadth& aBreadth) {
using Tag = StyleTrackBreadth::Tag;
switch (aBreadth.tag) {
case Tag::MinContent:
return aValue->SetString("min-content");
case Tag::MaxContent:
return aValue->SetString("max-content");
case Tag::Auto:
return aValue->SetString("auto");
case Tag::Breadth:
return SetValueToLengthPercentage(aValue, aBreadth.AsBreadth(), true);
case Tag::Fr: {
nsAutoString tmpStr;
nsStyleUtil::AppendCSSNumber(aBreadth.AsFr(), tmpStr);
tmpStr.AppendLiteral("fr");
return aValue->SetString(tmpStr);
}
default:
MOZ_ASSERT_UNREACHABLE("Unknown breadth value");
return;
}
}
already_AddRefed<nsROCSSPrimitiveValue> nsComputedDOMStyle::GetGridTrackBreadth(
const StyleTrackBreadth& aBreadth) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToTrackBreadth(val, aBreadth);
return val.forget();
}
already_AddRefed<nsROCSSPrimitiveValue> nsComputedDOMStyle::GetGridTrackSize(
const StyleTrackSize& aTrackSize) {
if (aTrackSize.IsFitContent()) {
// A fit-content() function.
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
MOZ_ASSERT(aTrackSize.AsFitContent().IsBreadth(),
"unexpected unit for fit-content() argument value");
SetValueFromFitContentFunction(val, aTrackSize.AsFitContent().AsBreadth());
return val.forget();
}
if (aTrackSize.IsBreadth()) {
return GetGridTrackBreadth(aTrackSize.AsBreadth());
}
MOZ_ASSERT(aTrackSize.IsMinmax());
const auto& min = aTrackSize.AsMinmax()._0;
const auto& max = aTrackSize.AsMinmax()._1;
if (min == max) {
return GetGridTrackBreadth(min);
}
// minmax(auto, <flex>) is equivalent to (and is our internal representation
// of) <flex>, and both compute to <flex>
if (min.IsAuto() && max.IsFr()) {
return GetGridTrackBreadth(max);
}
nsAutoString argumentStr, minmaxStr;
minmaxStr.AppendLiteral("minmax(");
{
RefPtr<nsROCSSPrimitiveValue> argValue = GetGridTrackBreadth(min);
argValue->GetCssText(argumentStr);
minmaxStr.Append(argumentStr);
argumentStr.Truncate();
}
minmaxStr.AppendLiteral(", ");
{
RefPtr<nsROCSSPrimitiveValue> argValue = GetGridTrackBreadth(max);
argValue->GetCssText(argumentStr);
minmaxStr.Append(argumentStr);
}
minmaxStr.Append(char16_t(')'));
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString(minmaxStr);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetGridTemplateColumnsRows(
const StyleGridTemplateComponent& aTrackList,
const ComputedGridTrackInfo& aTrackInfo) {
if (aTrackInfo.mIsMasonry) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString("masonry");
return val.forget();
}
if (aTrackInfo.mIsSubgrid) {
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(false);
auto subgridKeyword = MakeRefPtr<nsROCSSPrimitiveValue>();
subgridKeyword->SetString("subgrid");
valueList->AppendCSSValue(subgridKeyword.forget());
for (const auto& lineNames : aTrackInfo.mResolvedLineNames) {
AppendGridLineNames(valueList, lineNames, /*aSuppressEmptyList*/ false);
}
uint32_t line = aTrackInfo.mResolvedLineNames.Length();
uint32_t lastLine = aTrackInfo.mNumExplicitTracks + 1;
const Span<const StyleCustomIdent> empty;
for (; line < lastLine; ++line) {
AppendGridLineNames(valueList, empty, /*aSuppressEmptyList*/ false);
}
return valueList.forget();
}
const bool serializeImplicit =
StaticPrefs::layout_css_serialize_grid_implicit_tracks();
const nsTArray<nscoord>& trackSizes = aTrackInfo.mSizes;
const uint32_t numExplicitTracks = aTrackInfo.mNumExplicitTracks;
const uint32_t numLeadingImplicitTracks =
aTrackInfo.mNumLeadingImplicitTracks;
uint32_t numSizes = trackSizes.Length();
MOZ_ASSERT(numSizes >= numLeadingImplicitTracks + numExplicitTracks);
const bool hasTracksToSerialize =
serializeImplicit ? !!numSizes : !!numExplicitTracks;
const bool hasRepeatAuto = aTrackList.HasRepeatAuto();
if (!hasTracksToSerialize && !hasRepeatAuto) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString("none");
return val.forget();
}
// We've done layout on the grid and have resolved the sizes of its tracks,
// so we'll return those sizes here. The grid spec says we MAY use
// repeat(<positive-integer>, Npx) here for consecutive tracks with the same
// size, but that doesn't seem worth doing since even for repeat(auto-*)
// the resolved size might differ for the repeated tracks.
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(false);
// Add any leading implicit tracks.
if (serializeImplicit) {
for (uint32_t i = 0; i < numLeadingImplicitTracks; ++i) {
valueList->AppendCSSValue(AppUnitsToCSSValue(trackSizes[i]));
}
}
if (hasRepeatAuto) {
const auto* const autoRepeatValue = aTrackList.GetRepeatAutoValue();
const auto repeatLineNames = autoRepeatValue->line_names.AsSpan();
MOZ_ASSERT(repeatLineNames.Length() >= 2);
// Number of tracks inside the repeat, not including any repetitions.
// Check that if we have truncated the number of tracks due to overflowing
// the maximum track limit then we also truncate this repeat count.
MOZ_ASSERT(repeatLineNames.Length() ==
autoRepeatValue->track_sizes.len + 1);
// If we have truncated the first repetition of repeat tracks, then we
// can't index using autoRepeatValue->track_sizes.len, and
// aTrackInfo.mRemovedRepeatTracks.Length() will account for all repeat
// tracks that haven't been truncated.
const uint32_t numRepeatTracks =
std::min(aTrackInfo.mRemovedRepeatTracks.Length(),
autoRepeatValue->track_sizes.len);
MOZ_ASSERT(repeatLineNames.Length() >= numRepeatTracks + 1);
// The total of all tracks in all repetitions of the repeat.
const uint32_t totalNumRepeatTracks =
aTrackInfo.mRemovedRepeatTracks.Length();
const uint32_t repeatStart = aTrackInfo.mRepeatFirstTrack;
// We need to skip over any track sizes which were resolved to 0 by
// collapsed tracks. Keep track of the iteration separately.
const auto explicitTrackSizeBegin =
trackSizes.cbegin() + numLeadingImplicitTracks;
const auto explicitTrackSizeEnd =
explicitTrackSizeBegin + numExplicitTracks;
auto trackSizeIter = explicitTrackSizeBegin;
// Write any leading explicit tracks before the repeat.
for (uint32_t i = 0; i < repeatStart; i++) {
AppendGridLineNames(valueList, aTrackInfo.mResolvedLineNames[i]);
valueList->AppendCSSValue(AppUnitsToCSSValue(*trackSizeIter++));
}
auto lineNameIter = aTrackInfo.mResolvedLineNames.cbegin() + repeatStart;
// Write the track names at the start of the repeat, including the names
// at the end of the last non-repeat track. Unlike all later repeat line
// name lists, this one needs the resolved line name which includes both
// the last non-repeat line names and the leading repeat line names.
AppendGridLineNames(valueList, *lineNameIter++);
{
// Write out the first repeat value, checking for size zero (removed
// track).
const nscoord firstRepeatTrackSize =
(!aTrackInfo.mRemovedRepeatTracks[0]) ? *trackSizeIter++ : 0;
valueList->AppendCSSValue(AppUnitsToCSSValue(firstRepeatTrackSize));
}
// Write the line names and track sizes inside the repeat, checking for
// removed tracks (size 0).
for (uint32_t i = 1; i < totalNumRepeatTracks; i++) {
const uint32_t repeatIndex = i % numRepeatTracks;
// If we are rolling over from one repetition to the next, include track
// names from both the end of the previous repeat and the start of the
// next.
if (repeatIndex == 0) {
AppendGridLineNames(valueList,
repeatLineNames[numRepeatTracks].AsSpan(),
repeatLineNames[0].AsSpan());
} else {
AppendGridLineNames(valueList, repeatLineNames[repeatIndex].AsSpan());
}
MOZ_ASSERT(aTrackInfo.mRemovedRepeatTracks[i] ||
trackSizeIter != explicitTrackSizeEnd);
const nscoord repeatTrackSize =
(!aTrackInfo.mRemovedRepeatTracks[i]) ? *trackSizeIter++ : 0;
valueList->AppendCSSValue(AppUnitsToCSSValue(repeatTrackSize));
}
// The resolved line names include a single repetition of the auto-repeat
// line names. Skip over those.
lineNameIter += numRepeatTracks - 1;
// Write out any more tracks after the repeat.
while (trackSizeIter != explicitTrackSizeEnd) {
AppendGridLineNames(valueList, *lineNameIter++);
valueList->AppendCSSValue(AppUnitsToCSSValue(*trackSizeIter++));
}
// Write the final trailing line name.
AppendGridLineNames(valueList, *lineNameIter++);
} else if (numExplicitTracks > 0) {
// If there are explicit tracks but no repeat tracks, just serialize those.
for (uint32_t i = 0;; i++) {
AppendGridLineNames(valueList, aTrackInfo.mResolvedLineNames[i]);
if (i == numExplicitTracks) {
break;
}
valueList->AppendCSSValue(
AppUnitsToCSSValue(trackSizes[i + numLeadingImplicitTracks]));
}
}
// Add any trailing implicit tracks.
if (serializeImplicit) {
for (uint32_t i = numLeadingImplicitTracks + numExplicitTracks;
i < numSizes; ++i) {
valueList->AppendCSSValue(AppUnitsToCSSValue(trackSizes[i]));
}
}
return valueList.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetGridTemplateColumns() {
nsGridContainerFrame* gridFrame =
nsGridContainerFrame::GetGridFrameWithComputedInfo(mInnerFrame);
if (!gridFrame) {
// The element doesn't have a box - return the computed value.
// https://drafts.csswg.org/css-grid/#resolved-track-list
nsAutoCString string;
mComputedStyle->GetComputedPropertyValue(eCSSProperty_grid_template_columns,
string);
auto value = MakeRefPtr<nsROCSSPrimitiveValue>();
value->SetString(string);
return value.forget();
}
// GetGridFrameWithComputedInfo() above ensures that this returns non-null:
const ComputedGridTrackInfo* info = gridFrame->GetComputedTemplateColumns();
return GetGridTemplateColumnsRows(StylePosition()->mGridTemplateColumns,
*info);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetGridTemplateRows() {
nsGridContainerFrame* gridFrame =
nsGridContainerFrame::GetGridFrameWithComputedInfo(mInnerFrame);
if (!gridFrame) {
// The element doesn't have a box - return the computed value.
// https://drafts.csswg.org/css-grid/#resolved-track-list
nsAutoCString string;
mComputedStyle->GetComputedPropertyValue(eCSSProperty_grid_template_rows,
string);
auto value = MakeRefPtr<nsROCSSPrimitiveValue>();
value->SetString(string);
return value.forget();
}
// GetGridFrameWithComputedInfo() above ensures that this returns non-null:
const ComputedGridTrackInfo* info = gridFrame->GetComputedTemplateRows();
return GetGridTemplateColumnsRows(StylePosition()->mGridTemplateRows, *info);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetPaddingTop() {
return GetPaddingWidthFor(eSideTop);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetPaddingBottom() {
return GetPaddingWidthFor(eSideBottom);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetPaddingLeft() {
return GetPaddingWidthFor(eSideLeft);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetPaddingRight() {
return GetPaddingWidthFor(eSideRight);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBorderSpacing() {
RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(false);
const nsStyleTableBorder* border = StyleTableBorder();
valueList->AppendCSSValue(
PixelsToCSSValue(border->mBorderSpacing.width.ToCSSPixels()));
valueList->AppendCSSValue(
PixelsToCSSValue(border->mBorderSpacing.height.ToCSSPixels()));
return valueList.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBorderTopWidth() {
return GetBorderWidthFor(eSideTop);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBorderBottomWidth() {
return GetBorderWidthFor(eSideBottom);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBorderLeftWidth() {
return GetBorderWidthFor(eSideLeft);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetBorderRightWidth() {
return GetBorderWidthFor(eSideRight);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMarginTop() {
return GetMarginFor(eSideTop);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMarginBottom() {
return GetMarginFor(eSideBottom);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMarginLeft() {
return GetMarginFor(eSideLeft);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMarginRight() {
return GetMarginFor(eSideRight);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetHeight() {
if (mInnerFrame && !IsNonReplacedInline(mInnerFrame)) {
AssertFlushedPendingReflows();
const nsMargin adjustedValues = GetAdjustedValuesForBoxSizing();
return AppUnitsToCSSValue(mInnerFrame->GetContentRect().height +
adjustedValues.TopBottom());
}
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToSize(val, StylePosition()->mHeight);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetWidth() {
if (mInnerFrame && !IsNonReplacedInline(mInnerFrame)) {
AssertFlushedPendingReflows();
nsMargin adjustedValues = GetAdjustedValuesForBoxSizing();
return AppUnitsToCSSValue(mInnerFrame->GetContentRect().width +
adjustedValues.LeftRight());
}
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToSize(val, StylePosition()->mWidth);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMaxHeight() {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToMaxSize(val, StylePosition()->mMaxHeight);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMaxWidth() {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToMaxSize(val, StylePosition()->mMaxWidth);
return val.forget();
}
/**
* This function indicates whether we should return "auto" as the
* getComputedStyle() result for the (default) "min-width: auto" and
* "min-height: auto" CSS values.
*
* As of this writing, the CSS Sizing draft spec says this "auto" value
* *always* computes to itself. However, for now, we only make it compute to
* itself for grid and flex items (the containers where "auto" has special
* significance), because those are the only areas where the CSSWG has actually
* resolved on this "computes-to-itself" behavior. For elements in other sorts
* of containers, this function returns false, which will make us resolve
* "auto" to 0.
*/
bool nsComputedDOMStyle::ShouldHonorMinSizeAutoInAxis(PhysicalAxis aAxis) {
return mOuterFrame && mOuterFrame->IsFlexOrGridItem();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMinHeight() {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
StyleSize minHeight = StylePosition()->mMinHeight;
if (minHeight.IsAuto() &&
!ShouldHonorMinSizeAutoInAxis(PhysicalAxis::Vertical)) {
minHeight = StyleSize::LengthPercentage(LengthPercentage::Zero());
}
SetValueToSize(val, minHeight);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetMinWidth() {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
StyleSize minWidth = StylePosition()->mMinWidth;
if (minWidth.IsAuto() &&
!ShouldHonorMinSizeAutoInAxis(PhysicalAxis::Horizontal)) {
minWidth = StyleSize::LengthPercentage(LengthPercentage::Zero());
}
SetValueToSize(val, minWidth);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetLeft() {
return GetOffsetWidthFor(eSideLeft);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetRight() {
return GetOffsetWidthFor(eSideRight);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DoGetTop() {
return GetOffsetWidthFor(eSideTop);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetOffsetWidthFor(
mozilla::Side aSide) {
const nsStyleDisplay* display = StyleDisplay();
mozilla::StylePositionProperty position = display->mPosition;
if (!mOuterFrame) {
// GetNonStaticPositionOffset or GetAbsoluteOffset don't handle elements
// without frames in any sensible way. GetStaticOffset, however, is perfect
// for that case.
position = StylePositionProperty::Static;
}
switch (position) {
case StylePositionProperty::Static:
return GetStaticOffset(aSide);
case StylePositionProperty::Sticky:
return GetNonStaticPositionOffset(
aSide, false, &nsComputedDOMStyle::GetScrollFrameContentWidth,
&nsComputedDOMStyle::GetScrollFrameContentHeight);
case StylePositionProperty::Absolute:
case StylePositionProperty::Fixed:
return GetAbsoluteOffset(aSide);
case StylePositionProperty::Relative:
return GetNonStaticPositionOffset(
aSide, true, &nsComputedDOMStyle::GetCBContentWidth,
&nsComputedDOMStyle::GetCBContentHeight);
default:
MOZ_ASSERT_UNREACHABLE("Invalid position");
return nullptr;
}
}
static_assert(eSideTop == 0 && eSideRight == 1 && eSideBottom == 2 &&
eSideLeft == 3,
"box side constants not as expected for NS_OPPOSITE_SIDE");
#define NS_OPPOSITE_SIDE(s_) mozilla::Side(((s_) + 2) & 3)
already_AddRefed<CSSValue> nsComputedDOMStyle::GetNonStaticPositionOffset(
mozilla::Side aSide, bool aResolveAuto, PercentageBaseGetter aWidthGetter,
PercentageBaseGetter aHeightGetter) {
const nsStylePosition* positionData = StylePosition();
int32_t sign = 1;
LengthPercentageOrAuto coord = positionData->mOffset.Get(aSide);
if (coord.IsAuto()) {
if (!aResolveAuto) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString("auto");
return val.forget();
}
coord = positionData->mOffset.Get(NS_OPPOSITE_SIDE(aSide));
sign = -1;
}
if (!coord.IsLengthPercentage()) {
return PixelsToCSSValue(0.0f);
}
const auto& lp = coord.AsLengthPercentage();
if (lp.ConvertsToLength()) {
return PixelsToCSSValue(sign * lp.ToLengthInCSSPixels());
}
PercentageBaseGetter baseGetter = (aSide == eSideLeft || aSide == eSideRight)
? aWidthGetter
: aHeightGetter;
nscoord percentageBase;
if (!(this->*baseGetter)(percentageBase)) {
return PixelsToCSSValue(0.0f);
}
nscoord result = lp.Resolve(percentageBase);
return AppUnitsToCSSValue(sign * result);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetAbsoluteOffset(
mozilla::Side aSide) {
const auto& offset = StylePosition()->mOffset;
const auto& coord = offset.Get(aSide);
const auto& oppositeCoord = offset.Get(NS_OPPOSITE_SIDE(aSide));
if (coord.IsAuto() || oppositeCoord.IsAuto()) {
return AppUnitsToCSSValue(GetUsedAbsoluteOffset(aSide));
}
return GetNonStaticPositionOffset(
aSide, false, &nsComputedDOMStyle::GetCBPaddingRectWidth,
&nsComputedDOMStyle::GetCBPaddingRectHeight);
}
nscoord nsComputedDOMStyle::GetUsedAbsoluteOffset(mozilla::Side aSide) {
MOZ_ASSERT(mOuterFrame, "need a frame, so we can call GetContainingBlock()");
nsIFrame* container = mOuterFrame->GetContainingBlock();
nsMargin margin = mOuterFrame->GetUsedMargin();
nsMargin border = container->GetUsedBorder();
nsMargin scrollbarSizes(0, 0, 0, 0);
nsRect rect = mOuterFrame->GetRect();
nsRect containerRect = container->GetRect();
if (container->IsViewportFrame()) {
// For absolutely positioned frames scrollbars are taken into
// account by virtue of getting a containing block that does
// _not_ include the scrollbars. For fixed positioned frames,
// the containing block is the viewport, which _does_ include
// scrollbars. We have to do some extra work.
// the first child in the default frame list is what we want
nsIFrame* scrollingChild = container->PrincipalChildList().FirstChild();
ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(scrollingChild);
if (scrollContainerFrame) {
scrollbarSizes = scrollContainerFrame->GetActualScrollbarSizes();
}
// The viewport size might have been expanded by the visual viewport or
// the minimum-scale size.
const ViewportFrame* viewportFrame = do_QueryFrame(container);
MOZ_ASSERT(viewportFrame);
containerRect.SizeTo(
viewportFrame->AdjustViewportSizeForFixedPosition(containerRect));
} else if (container->IsGridContainerFrame() &&
mOuterFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
containerRect = nsGridContainerFrame::GridItemCB(mOuterFrame);
rect.MoveBy(-containerRect.x, -containerRect.y);
}
nscoord offset = 0;
switch (aSide) {
case eSideTop:
offset = rect.y - margin.top - border.top - scrollbarSizes.top;
break;
case eSideRight:
offset = containerRect.width - rect.width - rect.x - margin.right -
border.right - scrollbarSizes.right;
break;
case eSideBottom:
offset = containerRect.height - rect.height - rect.y - margin.bottom -
border.bottom - scrollbarSizes.bottom;
break;
case eSideLeft:
offset = rect.x - margin.left - border.left - scrollbarSizes.left;
break;
default:
NS_ERROR("Invalid side");
break;
}
return offset;
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetStaticOffset(
mozilla::Side aSide) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToLengthPercentageOrAuto(val, StylePosition()->mOffset.Get(aSide),
false);
return val.forget();
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetPaddingWidthFor(
mozilla::Side aSide) {
const auto& padding = StylePadding()->mPadding.Get(aSide);
if (!mInnerFrame || !PaddingNeedsUsedValue(padding, *mComputedStyle)) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToLengthPercentage(val, padding, true);
return val.forget();
}
AssertFlushedPendingReflows();
return AppUnitsToCSSValue(mInnerFrame->GetUsedPadding().Side(aSide));
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetBorderWidthFor(
mozilla::Side aSide) {
nscoord width;
if (mInnerFrame && mComputedStyle->StyleDisplay()->HasAppearance()) {
AssertFlushedPendingReflows();
width = mInnerFrame->GetUsedBorder().Side(aSide);
} else {
width = StyleBorder()->GetComputedBorderWidth(aSide);
}
return AppUnitsToCSSValue(width);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::GetMarginFor(Side aSide) {
const auto& margin = StyleMargin()->mMargin.Get(aSide);
if (!mInnerFrame || margin.ConvertsToLength()) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
SetValueToLengthPercentageOrAuto(val, margin, false);
return val.forget();
}
AssertFlushedPendingReflows();
// For tables, GetUsedMargin always returns an empty margin, so we
// should read the margin from the table wrapper frame instead.
NS_ASSERTION(
mOuterFrame == mInnerFrame || mInnerFrame->GetUsedMargin() == nsMargin(),
"Inner tables must have zero margins");
return AppUnitsToCSSValue(mOuterFrame->GetUsedMargin().Side(aSide));
}
static void SetValueToExtremumLength(nsROCSSPrimitiveValue* aValue,
nsIFrame::ExtremumLength aSize) {
switch (aSize) {
case nsIFrame::ExtremumLength::MaxContent:
return aValue->SetString("max-content");
case nsIFrame::ExtremumLength::MinContent:
return aValue->SetString("min-content");
case nsIFrame::ExtremumLength::MozAvailable:
return aValue->SetString("-moz-available");
case nsIFrame::ExtremumLength::FitContent:
return aValue->SetString("fit-content");
case nsIFrame::ExtremumLength::FitContentFunction:
MOZ_ASSERT_UNREACHABLE("fit-content() should be handled separately");
}
MOZ_ASSERT_UNREACHABLE("Unknown extremum length?");
}
void nsComputedDOMStyle::SetValueFromFitContentFunction(
nsROCSSPrimitiveValue* aValue, const LengthPercentage& aLength) {
nsAutoString argumentStr;
SetValueToLengthPercentage(aValue, aLength, true);
aValue->GetCssText(argumentStr);
nsAutoString fitContentStr;
fitContentStr.AppendLiteral("fit-content(");
fitContentStr.Append(argumentStr);
fitContentStr.Append(u')');
aValue->SetString(fitContentStr);
}
void nsComputedDOMStyle::SetValueToSize(nsROCSSPrimitiveValue* aValue,
const StyleSize& aSize) {
if (aSize.IsAuto()) {
return aValue->SetString("auto");
}
if (aSize.IsFitContentFunction()) {
return SetValueFromFitContentFunction(aValue, aSize.AsFitContentFunction());
}
if (auto length = nsIFrame::ToExtremumLength(aSize)) {
return SetValueToExtremumLength(aValue, *length);
}
MOZ_ASSERT(aSize.IsLengthPercentage());
SetValueToLengthPercentage(aValue, aSize.AsLengthPercentage(), true);
}
void nsComputedDOMStyle::SetValueToMaxSize(nsROCSSPrimitiveValue* aValue,
const StyleMaxSize& aSize) {
if (aSize.IsNone()) {
return aValue->SetString("none");
}
if (aSize.IsFitContentFunction()) {
return SetValueFromFitContentFunction(aValue, aSize.AsFitContentFunction());
}
if (auto length = nsIFrame::ToExtremumLength(aSize)) {
return SetValueToExtremumLength(aValue, *length);
}
MOZ_ASSERT(aSize.IsLengthPercentage());
SetValueToLengthPercentage(aValue, aSize.AsLengthPercentage(), true);
}
void nsComputedDOMStyle::SetValueToLengthPercentageOrAuto(
nsROCSSPrimitiveValue* aValue, const LengthPercentageOrAuto& aSize,
bool aClampNegativeCalc) {
if (aSize.IsAuto()) {
return aValue->SetString("auto");
}
SetValueToLengthPercentage(aValue, aSize.AsLengthPercentage(),
aClampNegativeCalc);
}
void nsComputedDOMStyle::SetValueToLengthPercentage(
nsROCSSPrimitiveValue* aValue, const mozilla::LengthPercentage& aLength,
bool aClampNegativeCalc) {
if (aLength.ConvertsToLength()) {
CSSCoord length = aLength.ToLengthInCSSPixels();
if (aClampNegativeCalc) {
length = std::max(float(length), 0.0f);
}
return SetValueToPixels(aValue, length);
}
if (aLength.ConvertsToPercentage()) {
float result = aLength.ToPercentage();
if (aClampNegativeCalc) {
result = std::max(result, 0.0f);
}
return aValue->SetPercent(result);
}
nsAutoCString result;
Servo_LengthPercentage_ToCss(&aLength, &result);
aValue->SetString(result);
}
bool nsComputedDOMStyle::GetCBContentWidth(nscoord& aWidth) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
aWidth = mOuterFrame->GetContainingBlock()->GetContentRect().width;
return true;
}
bool nsComputedDOMStyle::GetCBContentHeight(nscoord& aHeight) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
aHeight = mOuterFrame->GetContainingBlock()->GetContentRect().height;
return true;
}
bool nsComputedDOMStyle::GetCBPaddingRectWidth(nscoord& aWidth) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
aWidth = mOuterFrame->GetContainingBlock()->GetPaddingRect().width;
return true;
}
bool nsComputedDOMStyle::GetCBPaddingRectHeight(nscoord& aHeight) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
aHeight = mOuterFrame->GetContainingBlock()->GetPaddingRect().height;
return true;
}
bool nsComputedDOMStyle::GetScrollFrameContentWidth(nscoord& aWidth) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetNearestScrollContainerFrame(
mOuterFrame->GetParent(),
nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (!scrollContainerFrame) {
return false;
}
aWidth = scrollContainerFrame->GetScrolledFrame()
->GetContentRectRelativeToSelf()
.width;
return true;
}
bool nsComputedDOMStyle::GetScrollFrameContentHeight(nscoord& aHeight) {
if (!mOuterFrame) {
return false;
}
AssertFlushedPendingReflows();
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetNearestScrollContainerFrame(
mOuterFrame->GetParent(),
nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (!scrollContainerFrame) {
return false;
}
aHeight = scrollContainerFrame->GetScrolledFrame()
->GetContentRectRelativeToSelf()
.height;
return true;
}
bool nsComputedDOMStyle::GetFrameBorderRectWidth(nscoord& aWidth) {
if (!mInnerFrame) {
return false;
}
AssertFlushedPendingReflows();
aWidth = mInnerFrame->GetSize().width;
return true;
}
bool nsComputedDOMStyle::GetFrameBorderRectHeight(nscoord& aHeight) {
if (!mInnerFrame) {
return false;
}
AssertFlushedPendingReflows();
aHeight = mInnerFrame->GetSize().height;
return true;
}
/* If the property is "none", hand back "none" wrapped in a value.
* Otherwise, compute the aggregate transform matrix and hands it back in a
* "matrix" wrapper.
*/
already_AddRefed<CSSValue> nsComputedDOMStyle::GetTransformValue(
const StyleTransform& aTransform) {
/* If there are no transforms, then we should construct a single-element
* entry and hand it back.
*/
if (aTransform.IsNone()) {
auto val = MakeRefPtr<nsROCSSPrimitiveValue>();
val->SetString("none");
return val.forget();
}
/* Otherwise, we need to compute the current value of the transform matrix,
* store it in a string, and hand it back to the caller.
*/
/* Use the inner frame for the reference box. If we don't have an inner
* frame we use empty dimensions to allow us to continue (and percentage
* values in the transform will simply give broken results).
* TODO: There is no good way for us to represent the case where there's no
* frame, which is problematic. The reason is that when we have percentage
* transforms, there are a total of four stored matrix entries that influence
* the transform based on the size of the element. However, this poses a
* problem, because only two of these values can be explicitly referenced
* using the named transforms. Until a real solution is found, we'll just
* use this approach.
*/
nsStyleTransformMatrix::TransformReferenceBox refBox(mInnerFrame, nsRect());
gfx::Matrix4x4 matrix = nsStyleTransformMatrix::ReadTransforms(
aTransform, refBox, float(mozilla::AppUnitsPerCSSPixel()));
return MatrixToCSSValue(matrix);
}
already_AddRefed<CSSValue> nsComputedDOMStyle::DummyGetter() {
MOZ_CRASH("DummyGetter is not supposed to be invoked");
}
static void MarkComputedStyleMapDirty(const char* aPref, void* aMap) {
static_cast<ComputedStyleMap*>(aMap)->MarkDirty();
}
void nsComputedDOMStyle::ParentChainChanged(nsIContent* aContent) {
NS_ASSERTION(mElement == aContent, "didn't we register mElement?");
NS_ASSERTION(mResolvedComputedStyle,
"should have only registered an observer when "
"mResolvedComputedStyle is true");
ClearComputedStyle();
}
/* static */
ComputedStyleMap* nsComputedDOMStyle::GetComputedStyleMap() {
static ComputedStyleMap map{};
return &map;
}
static StaticAutoPtr<nsTArray<const char*>> gCallbackPrefs;
/* static */
void nsComputedDOMStyle::RegisterPrefChangeCallbacks() {
// Note that this will register callbacks for all properties with prefs, not
// just those that are implemented on computed style objects, as it's not
// easy to grab specific property data from ServoCSSPropList.h based on the
// entries iterated in nsComputedDOMStylePropertyList.h.
AutoTArray<const char*, 64> prefs;
for (const auto* p = nsCSSProps::kPropertyPrefTable;
p->mPropID != eCSSProperty_UNKNOWN; p++) {
// Many properties are controlled by the same preference, so de-duplicate
// them before adding observers.
//
// Note: This is done by pointer comparison, which works because the mPref
// members are string literals from the same same translation unit, and are
// therefore de-duplicated by the compiler. On the off chance that we wind
// up with some duplicates with different pointers, though, it's not a bit
// deal.
if (!prefs.ContainsSorted(p->mPref)) {
prefs.InsertElementSorted(p->mPref);
}
}
prefs.AppendElement(nullptr);
MOZ_ASSERT(!gCallbackPrefs);
gCallbackPrefs = new nsTArray<const char*>(std::move(prefs));
Preferences::RegisterCallbacks(MarkComputedStyleMapDirty,
gCallbackPrefs->Elements(),
GetComputedStyleMap());
}
/* static */
void nsComputedDOMStyle::UnregisterPrefChangeCallbacks() {
if (!gCallbackPrefs) {
return;
}
Preferences::UnregisterCallbacks(MarkComputedStyleMapDirty,
gCallbackPrefs->Elements(),
GetComputedStyleMap());
gCallbackPrefs = nullptr;
}
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