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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/. */
/* FFI functions for Servo to call into Gecko */
#include "mozilla/GeckoBindings.h"
#include "ChildIterator.h"
#include "ErrorReporter.h"
#include "gfxFontFeatures.h"
#include "gfxMathTable.h"
#include "gfxTextRun.h"
#include "imgLoader.h"
#include "nsAnimationManager.h"
#include "nsAttrValueInlines.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h"
#include "nsContentUtils.h"
#include "nsDOMTokenList.h"
#include "nsDeviceContext.h"
#include "nsLayoutUtils.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/DocumentInlines.h"
#include "nsILoadContext.h"
#include "nsIFrame.h"
#include "nsINode.h"
#include "nsIURI.h"
#include "nsFontMetrics.h"
#include "nsNameSpaceManager.h"
#include "nsNetUtil.h"
#include "nsProxyRelease.h"
#include "nsString.h"
#include "nsStyleStruct.h"
#include "nsStyleUtil.h"
#include "nsTArray.h"
#include "nsTransitionManager.h"
#include "nsWindowSizes.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/DeclarationBlock.h"
#include "mozilla/AttributeStyles.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/Hal.h"
#include "mozilla/Keyframe.h"
#include "mozilla/Mutex.h"
#include "mozilla/Preferences.h"
#include "mozilla/ServoElementSnapshot.h"
#include "mozilla/ShadowParts.h"
#include "mozilla/StaticPresData.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/SizeOfState.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoTraversalStatistics.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TimelineManager.h"
#include "mozilla/RWLock.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLTableCellElement.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/MediaList.h"
#include "mozilla/dom/ReferrerInfo.h"
#include "mozilla/dom/SVGElement.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/URLExtraData.h"
#include "mozilla/dom/CSSMozDocumentRule.h"
#if defined(MOZ_MEMORY)
# include "mozmemory.h"
#endif
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
// Definitions of the global traversal stats.
bool ServoTraversalStatistics::sActive = false;
ServoTraversalStatistics ServoTraversalStatistics::sSingleton;
static StaticAutoPtr<RWLock> sServoFFILock;
static const LangGroupFontPrefs* ThreadSafeGetLangGroupFontPrefs(
const Document& aDocument, nsAtom* aLanguage) {
bool needsCache = false;
{
AutoReadLock guard(*sServoFFILock);
if (auto* prefs = aDocument.GetFontPrefsForLang(aLanguage, &needsCache)) {
return prefs;
}
}
MOZ_ASSERT(needsCache);
AutoWriteLock guard(*sServoFFILock);
return aDocument.GetFontPrefsForLang(aLanguage);
}
static const nsFont& ThreadSafeGetDefaultVariableFont(const Document& aDocument,
nsAtom* aLanguage) {
return ThreadSafeGetLangGroupFontPrefs(aDocument, aLanguage)
->mDefaultVariableFont;
}
/*
* Does this child count as significant for selector matching?
*
* See nsStyleUtil::IsSignificantChild for details.
*/
bool Gecko_IsSignificantChild(const nsINode* aNode,
bool aWhitespaceIsSignificant) {
return nsStyleUtil::ThreadSafeIsSignificantChild(aNode->AsContent(),
aWhitespaceIsSignificant);
}
const nsINode* Gecko_GetLastChild(const nsINode* aNode) {
return aNode->GetLastChild();
}
const nsINode* Gecko_GetFlattenedTreeParentNode(const nsINode* aNode) {
return aNode->GetFlattenedTreeParentNodeForStyle();
}
const Element* Gecko_GetBeforeOrAfterPseudo(const Element* aElement,
bool aIsBefore) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(aElement->HasProperties());
return aIsBefore ? nsLayoutUtils::GetBeforePseudo(aElement)
: nsLayoutUtils::GetAfterPseudo(aElement);
}
const Element* Gecko_GetMarkerPseudo(const Element* aElement) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(aElement->HasProperties());
return nsLayoutUtils::GetMarkerPseudo(aElement);
}
nsTArray<nsIContent*>* Gecko_GetAnonymousContentForElement(
const Element* aElement) {
nsIAnonymousContentCreator* ac = do_QueryFrame(aElement->GetPrimaryFrame());
if (!ac) {
return nullptr;
}
auto* array = new nsTArray<nsIContent*>();
nsContentUtils::AppendNativeAnonymousChildren(aElement, *array, 0);
return array;
}
void Gecko_DestroyAnonymousContentList(nsTArray<nsIContent*>* aAnonContent) {
MOZ_ASSERT(aAnonContent);
delete aAnonContent;
}
const nsTArray<RefPtr<nsINode>>* Gecko_GetAssignedNodes(
const Element* aElement) {
MOZ_ASSERT(HTMLSlotElement::FromNode(aElement));
return &static_cast<const HTMLSlotElement*>(aElement)->AssignedNodes();
}
void Gecko_GetQueryContainerSize(const Element* aElement, nscoord* aOutWidth,
nscoord* aOutHeight) {
MOZ_ASSERT(aElement);
const nsIFrame* frame = aElement->GetPrimaryFrame();
if (!frame) {
return;
}
const auto containAxes = frame->GetContainSizeAxes();
if (!containAxes.IsAny()) {
return;
}
nsSize size = frame->GetContentRectRelativeToSelf().Size();
bool isVertical = frame->GetWritingMode().IsVertical();
if (isVertical ? containAxes.mBContained : containAxes.mIContained) {
*aOutWidth = size.width;
}
if (isVertical ? containAxes.mIContained : containAxes.mBContained) {
*aOutHeight = size.height;
}
}
void Gecko_ComputedStyle_Init(ComputedStyle* aStyle,
const ServoComputedData* aValues,
PseudoStyleType aPseudoType) {
new (KnownNotNull, aStyle)
ComputedStyle(aPseudoType, ServoComputedDataForgotten(aValues));
}
ServoComputedData::ServoComputedData(const ServoComputedDataForgotten aValue) {
PodAssign(this, aValue.mPtr);
}
MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoStyleStructsMallocEnclosingSizeOf)
void ServoComputedData::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
// Note: GetStyleFoo() returns a pointer to an nsStyleFoo that sits within a
// servo_arc::Arc, i.e. it is preceded by a word-sized refcount. So we need
// to measure it with a function that can handle an interior pointer. We use
// ServoStyleStructsEnclosingMallocSizeOf to clearly identify in DMD's
// output the memory measured here.
#define STYLE_STRUCT(name_) \
static_assert(alignof(nsStyle##name_) <= sizeof(size_t), \
"alignment will break AddSizeOfExcludingThis()"); \
const void* p##name_ = Style##name_(); \
if (!aSizes.mState.HaveSeenPtr(p##name_)) { \
aSizes.mStyleSizes.NS_STYLE_SIZES_FIELD(name_) += \
ServoStyleStructsMallocEnclosingSizeOf(p##name_); \
}
#include "nsStyleStructList.h"
#undef STYLE_STRUCT
if (visited_style && !aSizes.mState.HaveSeenPtr(visited_style)) {
visited_style->AddSizeOfIncludingThis(aSizes,
&aSizes.mLayoutComputedValuesVisited);
}
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - custom_properties
// - writing_mode
// - rules
// - font_computation_data
}
void Gecko_ComputedStyle_Destroy(ComputedStyle* aStyle) {
aStyle->~ComputedStyle();
}
void Gecko_ConstructStyleChildrenIterator(const Element* aElement,
StyleChildrenIterator* aIterator) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(aIterator);
new (aIterator) StyleChildrenIterator(aElement);
}
void Gecko_DestroyStyleChildrenIterator(StyleChildrenIterator* aIterator) {
MOZ_ASSERT(aIterator);
aIterator->~StyleChildrenIterator();
}
const nsINode* Gecko_GetNextStyleChild(StyleChildrenIterator* aIterator) {
MOZ_ASSERT(aIterator);
return aIterator->GetNextChild();
}
bool Gecko_VisitedStylesEnabled(const Document* aDoc) {
MOZ_ASSERT(aDoc);
MOZ_ASSERT(NS_IsMainThread());
if (!StaticPrefs::layout_css_visited_links_enabled()) {
return false;
}
if (aDoc->IsBeingUsedAsImage()) {
return false;
}
nsILoadContext* loadContext = aDoc->GetLoadContext();
if (loadContext && loadContext->UsePrivateBrowsing()) {
return false;
}
return true;
}
ElementState::InternalType Gecko_ElementState(const Element* aElement) {
return aElement->StyleState().GetInternalValue();
}
bool Gecko_IsRootElement(const Element* aElement) {
return aElement->OwnerDoc()->GetRootElement() == aElement;
}
void Gecko_NoteDirtyElement(const Element* aElement) {
MOZ_ASSERT(NS_IsMainThread());
const_cast<Element*>(aElement)->NoteDirtyForServo();
}
void Gecko_NoteDirtySubtreeForInvalidation(const Element* aElement) {
MOZ_ASSERT(NS_IsMainThread());
const_cast<Element*>(aElement)->NoteDirtySubtreeForServo();
}
void Gecko_NoteAnimationOnlyDirtyElement(const Element* aElement) {
MOZ_ASSERT(NS_IsMainThread());
const_cast<Element*>(aElement)->NoteAnimationOnlyDirtyForServo();
}
bool Gecko_AnimationNameMayBeReferencedFromStyle(
const nsPresContext* aPresContext, nsAtom* aName) {
MOZ_ASSERT(aPresContext);
return aPresContext->AnimationManager()->AnimationMayBeReferenced(aName);
}
float Gecko_GetScrollbarInlineSize(const nsPresContext* aPc) {
MOZ_ASSERT(aPc);
AutoWriteLock guard(*sServoFFILock); // We read some look&feel values.
auto overlay = aPc->UseOverlayScrollbars() ? nsITheme::Overlay::Yes
: nsITheme::Overlay::No;
LayoutDeviceIntCoord size =
aPc->Theme()->GetScrollbarSize(aPc, StyleScrollbarWidth::Auto, overlay);
return aPc->DevPixelsToFloatCSSPixels(size);
}
PseudoStyleType Gecko_GetImplementedPseudo(const Element* aElement) {
return aElement->GetPseudoElementType();
}
uint32_t Gecko_CalcStyleDifference(const ComputedStyle* aOldStyle,
const ComputedStyle* aNewStyle,
bool* aAnyStyleStructChanged,
bool* aOnlyResetStructsChanged) {
MOZ_ASSERT(aOldStyle);
MOZ_ASSERT(aNewStyle);
uint32_t equalStructs;
nsChangeHint result =
aOldStyle->CalcStyleDifference(*aNewStyle, &equalStructs);
*aAnyStyleStructChanged =
equalStructs != StyleStructConstants::kAllStructsMask;
const auto kInheritedStructsMask =
StyleStructConstants::kInheritedStructsMask;
*aOnlyResetStructsChanged =
(equalStructs & kInheritedStructsMask) == kInheritedStructsMask;
return result;
}
nscoord Gecko_CalcLineHeight(const StyleLineHeight* aLh,
const nsPresContext* aPc, bool aVertical,
const nsStyleFont* aAgainstFont,
const mozilla::dom::Element* aElement) {
// Normal line-height depends on font metrics.
AutoWriteLock guard(*sServoFFILock);
return ReflowInput::CalcLineHeight(*aLh, *aAgainstFont,
const_cast<nsPresContext*>(aPc), aVertical,
aElement, NS_UNCONSTRAINEDSIZE, 1.0f);
}
const ServoElementSnapshot* Gecko_GetElementSnapshot(
const ServoElementSnapshotTable* aTable, const Element* aElement) {
MOZ_ASSERT(aTable);
MOZ_ASSERT(aElement);
return aTable->Get(const_cast<Element*>(aElement));
}
bool Gecko_HaveSeenPtr(SeenPtrs* aTable, const void* aPtr) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aTable);
// Empty Rust allocations are indicated by small values up to the alignment
// of the relevant type. We shouldn't see anything like that here.
MOZ_ASSERT(uintptr_t(aPtr) > 16);
return aTable->HaveSeenPtr(aPtr);
}
const StyleLockedDeclarationBlock* Gecko_GetStyleAttrDeclarationBlock(
const Element* aElement) {
DeclarationBlock* decl = aElement->GetInlineStyleDeclaration();
if (!decl) {
return nullptr;
}
return decl->Raw();
}
void Gecko_UnsetDirtyStyleAttr(const Element* aElement) {
DeclarationBlock* decl = aElement->GetInlineStyleDeclaration();
if (!decl) {
return;
}
decl->UnsetDirty();
}
const StyleLockedDeclarationBlock*
Gecko_GetHTMLPresentationAttrDeclarationBlock(const Element* aElement) {
return aElement->GetMappedAttributeStyle();
}
const StyleLockedDeclarationBlock* Gecko_GetExtraContentStyleDeclarations(
const Element* aElement) {
if (const auto* cell = HTMLTableCellElement::FromNode(aElement)) {
return cell->GetMappedAttributesInheritedFromTable();
}
if (const auto* img = HTMLImageElement::FromNode(aElement)) {
return img->GetMappedAttributesFromSource();
}
return nullptr;
}
const StyleLockedDeclarationBlock* Gecko_GetUnvisitedLinkAttrDeclarationBlock(
const Element* aElement) {
AttributeStyles* attrStyles = aElement->OwnerDoc()->GetAttributeStyles();
if (!attrStyles) {
return nullptr;
}
return attrStyles->GetServoUnvisitedLinkDecl();
}
StyleSheet* Gecko_StyleSheet_Clone(const StyleSheet* aSheet,
const StyleSheet* aNewParentSheet) {
MOZ_ASSERT(aSheet);
MOZ_ASSERT(aSheet->GetParentSheet(), "Should only be used for @import");
MOZ_ASSERT(aNewParentSheet, "Wat");
RefPtr<StyleSheet> newSheet = aSheet->Clone(nullptr, nullptr);
// NOTE(emilio): This code runs in the StylesheetInner constructor, which
// means that the inner pointer of `aNewParentSheet` still points to the old
// one.
//
// So we _don't_ update neither the parent pointer of the stylesheet, nor the
// child list (yet). This is fixed up in that same constructor.
return static_cast<StyleSheet*>(newSheet.forget().take());
}
void Gecko_StyleSheet_AddRef(const StyleSheet* aSheet) {
MOZ_ASSERT(NS_IsMainThread());
const_cast<StyleSheet*>(aSheet)->AddRef();
}
void Gecko_StyleSheet_Release(const StyleSheet* aSheet) {
MOZ_ASSERT(NS_IsMainThread());
const_cast<StyleSheet*>(aSheet)->Release();
}
const StyleLockedDeclarationBlock* Gecko_GetVisitedLinkAttrDeclarationBlock(
const Element* aElement) {
AttributeStyles* attrStyles = aElement->OwnerDoc()->GetAttributeStyles();
if (!attrStyles) {
return nullptr;
}
return attrStyles->GetServoVisitedLinkDecl();
}
const StyleLockedDeclarationBlock* Gecko_GetActiveLinkAttrDeclarationBlock(
const Element* aElement) {
AttributeStyles* attrStyles = aElement->OwnerDoc()->GetAttributeStyles();
if (!attrStyles) {
return nullptr;
}
return attrStyles->GetServoActiveLinkDecl();
}
bool Gecko_GetAnimationRule(const Element* aElement,
EffectCompositor::CascadeLevel aCascadeLevel,
StyleAnimationValueMap* aAnimationValues) {
MOZ_ASSERT(aElement);
Document* doc = aElement->GetComposedDoc();
if (!doc) {
return false;
}
nsPresContext* presContext = doc->GetPresContext();
if (!presContext) {
return false;
}
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
return presContext->EffectCompositor()->GetServoAnimationRule(
element, pseudoType, aCascadeLevel, aAnimationValues);
}
bool Gecko_StyleAnimationsEquals(const nsStyleAutoArray<StyleAnimation>* aA,
const nsStyleAutoArray<StyleAnimation>* aB) {
return *aA == *aB;
}
bool Gecko_StyleScrollTimelinesEquals(
const nsStyleAutoArray<StyleScrollTimeline>* aA,
const nsStyleAutoArray<StyleScrollTimeline>* aB) {
return *aA == *aB;
}
bool Gecko_StyleViewTimelinesEquals(
const nsStyleAutoArray<StyleViewTimeline>* aA,
const nsStyleAutoArray<StyleViewTimeline>* aB) {
return *aA == *aB;
}
void Gecko_UpdateAnimations(const Element* aElement,
const ComputedStyle* aOldComputedData,
const ComputedStyle* aComputedData,
UpdateAnimationsTasks aTasks) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aElement);
if (!aElement->IsInComposedDoc()) {
return;
}
nsPresContext* presContext = nsContentUtils::GetContextForContent(aElement);
if (!presContext || !presContext->IsDynamic()) {
return;
}
nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
// Handle scroll/view timelines first because CSS animations may refer to the
// timeline defined by itself.
if (aTasks & UpdateAnimationsTasks::ScrollTimelines) {
presContext->TimelineManager()->UpdateTimelines(
const_cast<Element*>(element), pseudoType, aComputedData,
TimelineManager::ProgressTimelineType::Scroll);
}
if (aTasks & UpdateAnimationsTasks::ViewTimelines) {
presContext->TimelineManager()->UpdateTimelines(
const_cast<Element*>(element), pseudoType, aComputedData,
TimelineManager::ProgressTimelineType::View);
}
if (aTasks & UpdateAnimationsTasks::CSSAnimations) {
presContext->AnimationManager()->UpdateAnimations(
const_cast<Element*>(element), pseudoType, aComputedData);
}
// aComputedData might be nullptr if the target element is now in a
// display:none subtree. We still call Gecko_UpdateAnimations in this case
// because we need to stop CSS animations in the display:none subtree.
// However, we don't need to update transitions since they are stopped by
// RestyleManager::AnimationsWithDestroyedFrame so we just return early
// here.
if (!aComputedData) {
return;
}
if (aTasks & UpdateAnimationsTasks::CSSTransitions) {
MOZ_ASSERT(aOldComputedData);
presContext->TransitionManager()->UpdateTransitions(
const_cast<Element*>(element), pseudoType, *aOldComputedData,
*aComputedData);
}
if (aTasks & UpdateAnimationsTasks::EffectProperties) {
presContext->EffectCompositor()->UpdateEffectProperties(
aComputedData, const_cast<Element*>(element), pseudoType);
}
if (aTasks & UpdateAnimationsTasks::CascadeResults) {
EffectSet* effectSet = EffectSet::Get(element, pseudoType);
// CSS animations/transitions might have been destroyed as part of the above
// steps so before updating cascade results, we check if there are still any
// animations to update.
if (effectSet) {
// We call UpdateCascadeResults directly (intead of
// MaybeUpdateCascadeResults) since we know for sure that the cascade has
// changed, but we were unable to call MarkCascadeUpdated when we noticed
// it since we avoid mutating state as part of the Servo parallel
// traversal.
presContext->EffectCompositor()->UpdateCascadeResults(
*effectSet, const_cast<Element*>(element), pseudoType);
}
}
if (aTasks & UpdateAnimationsTasks::DisplayChangedFromNone) {
presContext->EffectCompositor()->RequestRestyle(
const_cast<Element*>(element), pseudoType,
EffectCompositor::RestyleType::Standard,
EffectCompositor::CascadeLevel::Animations);
}
}
size_t Gecko_GetAnimationEffectCount(const Element* aElementOrPseudo) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElementOrPseudo);
EffectSet* effectSet = EffectSet::Get(element, pseudoType);
return effectSet ? effectSet->Count() : 0;
}
bool Gecko_ElementHasAnimations(const Element* aElement) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
return !!EffectSet::Get(element, pseudoType);
}
bool Gecko_ElementHasCSSAnimations(const Element* aElement) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
auto* collection =
nsAnimationManager::CSSAnimationCollection::Get(element, pseudoType);
return collection && !collection->mAnimations.IsEmpty();
}
bool Gecko_ElementHasCSSTransitions(const Element* aElement) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
auto* collection =
nsTransitionManager::CSSTransitionCollection::Get(element, pseudoType);
return collection && !collection->mAnimations.IsEmpty();
}
size_t Gecko_ElementTransitions_Length(const Element* aElement) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
auto* collection =
nsTransitionManager::CSSTransitionCollection::Get(element, pseudoType);
return collection ? collection->mAnimations.Length() : 0;
}
static CSSTransition* GetCurrentTransitionAt(const Element* aElement,
size_t aIndex) {
const auto [element, pseudoType] =
AnimationUtils::GetElementPseudoPair(aElement);
auto* collection =
nsTransitionManager::CSSTransitionCollection ::Get(element, pseudoType);
if (!collection) {
return nullptr;
}
return collection->mAnimations.SafeElementAt(aIndex);
}
nsCSSPropertyID Gecko_ElementTransitions_PropertyAt(const Element* aElement,
size_t aIndex) {
CSSTransition* transition = GetCurrentTransitionAt(aElement, aIndex);
return transition ? transition->TransitionProperty().mID
: nsCSSPropertyID::eCSSProperty_UNKNOWN;
}
const StyleAnimationValue* Gecko_ElementTransitions_EndValueAt(
const Element* aElement, size_t aIndex) {
CSSTransition* transition = GetCurrentTransitionAt(aElement, aIndex);
return transition ? transition->ToValue().mServo.get() : nullptr;
}
double Gecko_GetProgressFromComputedTiming(const ComputedTiming* aTiming) {
return aTiming->mProgress.Value();
}
double Gecko_GetPositionInSegment(const AnimationPropertySegment* aSegment,
double aProgress, bool aBeforeFlag) {
MOZ_ASSERT(aSegment->mFromKey < aSegment->mToKey,
"The segment from key should be less than to key");
double positionInSegment = (aProgress - aSegment->mFromKey) /
// To avoid floating precision inaccuracies, make
// sure we calculate both the numerator and
// denominator using double precision.
(double(aSegment->mToKey) - aSegment->mFromKey);
return StyleComputedTimingFunction::GetPortion(
aSegment->mTimingFunction, positionInSegment, aBeforeFlag);
}
const StyleAnimationValue* Gecko_AnimationGetBaseStyle(
const RawServoAnimationValueTable* aBaseStyles,
const mozilla::AnimatedPropertyID* aProperty) {
const auto* base = reinterpret_cast<const nsRefPtrHashtable<
nsGenericHashKey<AnimatedPropertyID>, StyleAnimationValue>*>(aBaseStyles);
return base->GetWeak(*aProperty);
}
void Gecko_FillAllImageLayers(nsStyleImageLayers* aLayers, uint32_t aMaxLen) {
aLayers->FillAllLayers(aMaxLen);
}
bool Gecko_IsDocumentBody(const Element* aElement) {
Document* doc = aElement->GetUncomposedDoc();
return doc && doc->GetBodyElement() == aElement;
}
bool Gecko_IsDarkColorScheme(const Document* aDoc,
const StyleColorScheme* aStyle) {
return LookAndFeel::ColorSchemeForStyle(*aDoc, aStyle->bits) ==
ColorScheme::Dark;
}
nscolor Gecko_ComputeSystemColor(StyleSystemColor aColor, const Document* aDoc,
const StyleColorScheme* aStyle) {
auto colorScheme = LookAndFeel::ColorSchemeForStyle(*aDoc, aStyle->bits);
const auto& prefs = PreferenceSheet::PrefsFor(*aDoc);
if (prefs.mMustUseLightSystemColors) {
colorScheme = ColorScheme::Light;
}
const auto& colors = prefs.ColorsFor(colorScheme);
switch (aColor) {
case StyleSystemColor::Canvastext:
return colors.mDefault;
case StyleSystemColor::Canvas:
return colors.mDefaultBackground;
case StyleSystemColor::Linktext:
return colors.mLink;
case StyleSystemColor::Activetext:
return colors.mActiveLink;
case StyleSystemColor::Visitedtext:
return colors.mVisitedLink;
default:
break;
}
auto useStandins = LookAndFeel::ShouldUseStandins(*aDoc, aColor);
AutoWriteLock guard(*sServoFFILock);
return LookAndFeel::Color(aColor, colorScheme, useStandins);
}
int32_t Gecko_GetLookAndFeelInt(int32_t aId) {
auto intId = static_cast<LookAndFeel::IntID>(aId);
AutoWriteLock guard(*sServoFFILock);
return LookAndFeel::GetInt(intId);
}
float Gecko_GetLookAndFeelFloat(int32_t aId) {
auto id = static_cast<LookAndFeel::FloatID>(aId);
AutoWriteLock guard(*sServoFFILock);
return LookAndFeel::GetFloat(id);
}
bool Gecko_MatchLang(const Element* aElement, nsAtom* aOverrideLang,
bool aHasOverrideLang, const char16_t* aValue) {
MOZ_ASSERT(!(aOverrideLang && !aHasOverrideLang),
"aHasOverrideLang should only be set when aOverrideLang is null");
MOZ_ASSERT(aValue, "null lang parameter");
if (!aValue || !*aValue) {
return false;
}
// We have to determine the language of the current element. Since
// this is currently no property and since the language is inherited
// from the parent we have to be prepared to look at all parent
// nodes. The language itself is encoded in the LANG attribute.
if (auto* language = aHasOverrideLang ? aOverrideLang : aElement->GetLang()) {
return nsStyleUtil::LangTagCompare(nsAtomCString(language),
NS_ConvertUTF16toUTF8(aValue));
}
// Try to get the language from the HTTP header or if this
// is missing as well from the preferences.
// The content language can be a comma-separated list of
// language codes.
// FIXME: We're not really consistent in our treatment of comma-separated
// content-language values.
if (nsAtom* language = aElement->OwnerDoc()->GetContentLanguage()) {
const NS_ConvertUTF16toUTF8 langString(aValue);
nsAtomCString docLang(language);
docLang.StripWhitespace();
for (auto const& lang : docLang.Split(',')) {
if (nsStyleUtil::LangTagCompare(lang, langString)) {
return true;
}
}
}
return false;
}
nsAtom* Gecko_GetXMLLangValue(const Element* aElement) {
const nsAttrValue* attr =
aElement->GetParsedAttr(nsGkAtoms::lang, kNameSpaceID_XML);
if (!attr) {
return nullptr;
}
MOZ_ASSERT(attr->Type() == nsAttrValue::eAtom);
RefPtr<nsAtom> atom = attr->GetAtomValue();
return atom.forget().take();
}
const PreferenceSheet::Prefs* Gecko_GetPrefSheetPrefs(const Document* aDoc) {
return &PreferenceSheet::PrefsFor(*aDoc);
}
bool Gecko_IsTableBorderNonzero(const Element* aElement) {
if (!aElement->IsHTMLElement(nsGkAtoms::table)) {
return false;
}
const nsAttrValue* val = aElement->GetParsedAttr(nsGkAtoms::border);
return val &&
(val->Type() != nsAttrValue::eInteger || val->GetIntegerValue() != 0);
}
bool Gecko_IsSelectListBox(const Element* aElement) {
const auto* select = HTMLSelectElement::FromNode(aElement);
return select && !select->IsCombobox();
}
template <typename Implementor>
static nsAtom* LangValue(Implementor* aElement) {
// TODO(emilio): Deduplicate a bit with nsIContent::GetLang().
const nsAttrValue* attr =
aElement->GetParsedAttr(nsGkAtoms::lang, kNameSpaceID_XML);
if (!attr && aElement->SupportsLangAttr()) {
attr = aElement->GetParsedAttr(nsGkAtoms::lang);
}
if (!attr) {
return nullptr;
}
MOZ_ASSERT(attr->Type() == nsAttrValue::eAtom);
RefPtr<nsAtom> atom = attr->GetAtomValue();
return atom.forget().take();
}
bool Gecko_AttrEquals(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
return aValue->Equals(aStr, aIgnoreCase ? eIgnoreCase : eCaseMatters);
}
#define WITH_COMPARATOR(ignore_case_, c_, expr_) \
auto c_ = (ignore_case_) ? nsASCIICaseInsensitiveStringComparator \
: nsTDefaultStringComparator<char16_t>; \
return expr_;
bool Gecko_AttrDashEquals(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
nsAutoString str;
aValue->ToString(str);
WITH_COMPARATOR(
aIgnoreCase, c,
nsStyleUtil::DashMatchCompare(str, nsDependentAtomString(aStr), c))
}
bool Gecko_AttrIncludes(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
if (aStr == nsGkAtoms::_empty) {
return false;
}
nsAutoString str;
aValue->ToString(str);
WITH_COMPARATOR(
aIgnoreCase, c,
nsStyleUtil::ValueIncludes(str, nsDependentAtomString(aStr), c))
}
bool Gecko_AttrHasSubstring(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
return aStr != nsGkAtoms::_empty &&
aValue->HasSubstring(nsDependentAtomString(aStr),
aIgnoreCase ? eIgnoreCase : eCaseMatters);
}
bool Gecko_AttrHasPrefix(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
return aStr != nsGkAtoms::_empty &&
aValue->HasPrefix(nsDependentAtomString(aStr),
aIgnoreCase ? eIgnoreCase : eCaseMatters);
}
bool Gecko_AttrHasSuffix(const nsAttrValue* aValue, const nsAtom* aStr,
bool aIgnoreCase) {
return aStr != nsGkAtoms::_empty &&
aValue->HasSuffix(nsDependentAtomString(aStr),
aIgnoreCase ? eIgnoreCase : eCaseMatters);
}
#define SERVO_IMPL_ELEMENT_ATTR_MATCHING_FUNCTIONS(prefix_, implementor_) \
nsAtom* prefix_##LangValue(implementor_ aElement) { \
return LangValue(aElement); \
}
SERVO_IMPL_ELEMENT_ATTR_MATCHING_FUNCTIONS(Gecko_, const Element*)
SERVO_IMPL_ELEMENT_ATTR_MATCHING_FUNCTIONS(Gecko_Snapshot,
const ServoElementSnapshot*)
#undef SERVO_IMPL_ELEMENT_ATTR_MATCHING_FUNCTIONS
nsAtom* Gecko_Atomize(const char* aString, uint32_t aLength) {
return NS_Atomize(nsDependentCSubstring(aString, aLength)).take();
}
nsAtom* Gecko_Atomize16(const nsAString* aString) {
return NS_Atomize(*aString).take();
}
void Gecko_AddRefAtom(nsAtom* aAtom) { NS_ADDREF(aAtom); }
void Gecko_ReleaseAtom(nsAtom* aAtom) { NS_RELEASE(aAtom); }
void Gecko_nsFont_InitSystem(nsFont* aDest, StyleSystemFont aFontId,
const nsStyleFont* aFont,
const Document* aDocument) {
const nsFont& defaultVariableFont =
ThreadSafeGetDefaultVariableFont(*aDocument, aFont->mLanguage);
// We have passed uninitialized memory to this function,
// initialize it. We can't simply return an nsFont because then
// we need to know its size beforehand. Servo cannot initialize nsFont
// itself, so this will do.
new (aDest) nsFont(defaultVariableFont);
AutoWriteLock guard(*sServoFFILock);
nsLayoutUtils::ComputeSystemFont(aDest, aFontId, defaultVariableFont,
aDocument);
}
void Gecko_nsFont_Destroy(nsFont* aDest) { aDest->~nsFont(); }
StyleGenericFontFamily Gecko_nsStyleFont_ComputeFallbackFontTypeForLanguage(
const Document* aDoc, nsAtom* aLanguage) {
return ThreadSafeGetLangGroupFontPrefs(*aDoc, aLanguage)->GetDefaultGeneric();
}
Length Gecko_GetBaseSize(const Document* aDoc, nsAtom* aLang,
StyleGenericFontFamily aGeneric) {
return ThreadSafeGetLangGroupFontPrefs(*aDoc, aLang)
->GetDefaultFont(aGeneric)
->size;
}
gfxFontFeatureValueSet* Gecko_ConstructFontFeatureValueSet() {
return new gfxFontFeatureValueSet();
}
nsTArray<uint32_t>* Gecko_AppendFeatureValueHashEntry(
gfxFontFeatureValueSet* aFontFeatureValues, nsAtom* aFamily,
uint32_t aAlternate, nsAtom* aName) {
MOZ_ASSERT(NS_IsMainThread());
return aFontFeatureValues->AppendFeatureValueHashEntry(nsAtomCString(aFamily),
aName, aAlternate);
}
gfx::FontPaletteValueSet* Gecko_ConstructFontPaletteValueSet() {
return new gfx::FontPaletteValueSet();
}
gfx::FontPaletteValueSet::PaletteValues* Gecko_AppendPaletteValueHashEntry(
gfx::FontPaletteValueSet* aPaletteValueSet, nsAtom* aFamily,
nsAtom* aName) {
MOZ_ASSERT(NS_IsMainThread());
return aPaletteValueSet->Insert(aName, nsAtomCString(aFamily));
}
void Gecko_SetFontPaletteBase(gfx::FontPaletteValueSet::PaletteValues* aValues,
int32_t aBasePaletteIndex) {
aValues->mBasePalette = aBasePaletteIndex;
}
void Gecko_SetFontPaletteOverride(
gfx::FontPaletteValueSet::PaletteValues* aValues, int32_t aIndex,
StyleAbsoluteColor* aColor) {
if (aIndex < 0) {
return;
}
aValues->mOverrides.AppendElement(gfx::FontPaletteValueSet::OverrideColor{
uint32_t(aIndex), gfx::sRGBColor::FromABGR(aColor->ToColor())});
}
void Gecko_CounterStyle_ToPtr(const StyleCounterStyle* aStyle,
CounterStylePtr* aPtr) {
*aPtr = CounterStylePtr::FromStyle(*aStyle);
}
void Gecko_SetCounterStyleToNone(CounterStylePtr* aPtr) {
*aPtr = nsGkAtoms::none;
}
void Gecko_SetCounterStyleToString(CounterStylePtr* aPtr,
const nsACString* aSymbol) {
*aPtr = new AnonymousCounterStyle(NS_ConvertUTF8toUTF16(*aSymbol));
}
void Gecko_CopyCounterStyle(CounterStylePtr* aDst,
const CounterStylePtr* aSrc) {
*aDst = *aSrc;
}
nsAtom* Gecko_CounterStyle_GetName(const CounterStylePtr* aPtr) {
return aPtr->IsAtom() ? aPtr->AsAtom() : nullptr;
}
const AnonymousCounterStyle* Gecko_CounterStyle_GetAnonymous(
const CounterStylePtr* aPtr) {
return aPtr->AsAnonymous();
}
void Gecko_EnsureTArrayCapacity(void* aArray, size_t aCapacity,
size_t aElemSize) {
auto base =
reinterpret_cast<nsTArray_base<nsTArrayInfallibleAllocator,
nsTArray_RelocateUsingMemutils>*>(aArray);
base->EnsureCapacity<nsTArrayInfallibleAllocator>(aCapacity, aElemSize);
}
void Gecko_ClearPODTArray(void* aArray, size_t aElementSize,
size_t aElementAlign) {
auto base =
reinterpret_cast<nsTArray_base<nsTArrayInfallibleAllocator,
nsTArray_RelocateUsingMemutils>*>(aArray);
base->template ShiftData<nsTArrayInfallibleAllocator>(
0, base->Length(), 0, aElementSize, aElementAlign);
}
void Gecko_ResizeTArrayForStrings(nsTArray<nsString>* aArray,
uint32_t aLength) {
aArray->SetLength(aLength);
}
void Gecko_ResizeAtomArray(nsTArray<RefPtr<nsAtom>>* aArray, uint32_t aLength) {
aArray->SetLength(aLength);
}
void Gecko_EnsureImageLayersLength(nsStyleImageLayers* aLayers, size_t aLen,
nsStyleImageLayers::LayerType aLayerType) {
size_t oldLength = aLayers->mLayers.Length();
aLayers->mLayers.EnsureLengthAtLeast(aLen);
for (size_t i = oldLength; i < aLen; ++i) {
aLayers->mLayers[i].Initialize(aLayerType);
}
}
template <typename StyleType>
static void EnsureStyleAutoArrayLength(StyleType* aArray, size_t aLen) {
aArray->EnsureLengthAtLeast(aLen);
}
void Gecko_EnsureStyleAnimationArrayLength(void* aArray, size_t aLen) {
auto* base = static_cast<nsStyleAutoArray<StyleAnimation>*>(aArray);
EnsureStyleAutoArrayLength(base, aLen);
}
void Gecko_EnsureStyleTransitionArrayLength(void* aArray, size_t aLen) {
auto* base = reinterpret_cast<nsStyleAutoArray<StyleTransition>*>(aArray);
EnsureStyleAutoArrayLength(base, aLen);
}
void Gecko_EnsureStyleScrollTimelineArrayLength(void* aArray, size_t aLen) {
auto* base = static_cast<nsStyleAutoArray<StyleScrollTimeline>*>(aArray);
EnsureStyleAutoArrayLength(base, aLen);
}
void Gecko_EnsureStyleViewTimelineArrayLength(void* aArray, size_t aLen) {
auto* base = static_cast<nsStyleAutoArray<StyleViewTimeline>*>(aArray);
EnsureStyleAutoArrayLength(base, aLen);
}
enum class KeyframeSearchDirection {
Forwards,
Backwards,
};
enum class KeyframeInsertPosition {
Prepend,
LastForOffset,
};
static Keyframe* GetOrCreateKeyframe(
nsTArray<Keyframe>* aKeyframes, float aOffset,
const StyleComputedTimingFunction* aTimingFunction,
const CompositeOperationOrAuto aComposition,
KeyframeSearchDirection aSearchDirection,
KeyframeInsertPosition aInsertPosition) {
MOZ_ASSERT(aKeyframes, "The keyframe array should be valid");
MOZ_ASSERT(aTimingFunction, "The timing function should be valid");
MOZ_ASSERT(aOffset >= 0. && aOffset <= 1.,
"The offset should be in the range of [0.0, 1.0]");
size_t keyframeIndex;
switch (aSearchDirection) {
case KeyframeSearchDirection::Forwards:
if (nsAnimationManager::FindMatchingKeyframe(
*aKeyframes, aOffset, *aTimingFunction, aComposition,
keyframeIndex)) {
return &(*aKeyframes)[keyframeIndex];
}
break;
case KeyframeSearchDirection::Backwards:
if (nsAnimationManager::FindMatchingKeyframe(
Reversed(*aKeyframes), aOffset, *aTimingFunction, aComposition,
keyframeIndex)) {
return &(*aKeyframes)[aKeyframes->Length() - 1 - keyframeIndex];
}
keyframeIndex = aKeyframes->Length() - 1;
break;
}
Keyframe* keyframe = aKeyframes->InsertElementAt(
aInsertPosition == KeyframeInsertPosition::Prepend ? 0 : keyframeIndex);
keyframe->mOffset.emplace(aOffset);
if (!aTimingFunction->IsLinearKeyword()) {
keyframe->mTimingFunction.emplace(*aTimingFunction);
}
keyframe->mComposite = aComposition;
return keyframe;
}
Keyframe* Gecko_GetOrCreateKeyframeAtStart(
nsTArray<Keyframe>* aKeyframes, float aOffset,
const StyleComputedTimingFunction* aTimingFunction,
const CompositeOperationOrAuto aComposition) {
MOZ_ASSERT(aKeyframes->IsEmpty() ||
aKeyframes->ElementAt(0).mOffset.value() >= aOffset,
"The offset should be less than or equal to the first keyframe's "
"offset if there are exisiting keyframes");
return GetOrCreateKeyframe(aKeyframes, aOffset, aTimingFunction, aComposition,
KeyframeSearchDirection::Forwards,
KeyframeInsertPosition::Prepend);
}
Keyframe* Gecko_GetOrCreateInitialKeyframe(
nsTArray<Keyframe>* aKeyframes,
const StyleComputedTimingFunction* aTimingFunction,
const CompositeOperationOrAuto aComposition) {
return GetOrCreateKeyframe(aKeyframes, 0., aTimingFunction, aComposition,
KeyframeSearchDirection::Forwards,
KeyframeInsertPosition::LastForOffset);
}
Keyframe* Gecko_GetOrCreateFinalKeyframe(
nsTArray<Keyframe>* aKeyframes,
const StyleComputedTimingFunction* aTimingFunction,
const CompositeOperationOrAuto aComposition) {
return GetOrCreateKeyframe(aKeyframes, 1., aTimingFunction, aComposition,
KeyframeSearchDirection::Backwards,
KeyframeInsertPosition::LastForOffset);
}
PropertyValuePair* Gecko_AppendPropertyValuePair(
nsTArray<PropertyValuePair>* aProperties,
const mozilla::AnimatedPropertyID* aProperty) {
MOZ_ASSERT(aProperties);
MOZ_ASSERT(
aProperty->IsCustom() ||
!nsCSSProps::PropHasFlags(aProperty->mID, CSSPropFlags::IsLogical));
return aProperties->AppendElement(PropertyValuePair{*aProperty});
}
void Gecko_GetComputedURLSpec(const StyleComputedUrl* aURL, nsCString* aOut) {
MOZ_ASSERT(aURL);
MOZ_ASSERT(aOut);
if (aURL->IsLocalRef()) {
aOut->Assign(aURL->SpecifiedSerialization());
return;
}
Gecko_GetComputedImageURLSpec(aURL, aOut);
}
void Gecko_GetComputedImageURLSpec(const StyleComputedUrl* aURL,
nsCString* aOut) {
if (aURL->IsLocalRef() &&
StaticPrefs::layout_css_computed_style_dont_resolve_image_local_refs()) {
aOut->Assign(aURL->SpecifiedSerialization());
return;
}
if (nsIURI* uri = aURL->GetURI()) {
nsresult rv = uri->GetSpec(*aOut);
if (NS_SUCCEEDED(rv)) {
return;
}
}
// Empty URL computes to empty, per spec:
if (aURL->SpecifiedSerialization().IsEmpty()) {
aOut->Truncate();
} else {
aOut->AssignLiteral("about:invalid");
}
}
bool Gecko_IsSupportedImageMimeType(const uint8_t* aMimeType,
const uint32_t aLen) {
nsDependentCSubstring mime(reinterpret_cast<const char*>(aMimeType), aLen);
return imgLoader::SupportImageWithMimeType(
mime, AcceptedMimeTypes::IMAGES_AND_DOCUMENTS);
}
void Gecko_nsIURI_Debug(nsIURI* aURI, nsCString* aOut) {
// TODO(emilio): Do we have more useful stuff to put here, maybe?
if (aURI) {
*aOut = aURI->GetSpecOrDefault();
}
}
// XXX Implemented by hand because even though it's thread-safe, only the
// subclasses have the HasThreadSafeRefCnt bits.
void Gecko_AddRefnsIURIArbitraryThread(nsIURI* aPtr) { NS_ADDREF(aPtr); }
void Gecko_ReleasensIURIArbitraryThread(nsIURI* aPtr) { NS_RELEASE(aPtr); }
void Gecko_nsIReferrerInfo_Debug(nsIReferrerInfo* aReferrerInfo,
nsCString* aOut) {
if (aReferrerInfo) {
if (nsCOMPtr<nsIURI> referrer = aReferrerInfo->GetComputedReferrer()) {
*aOut = referrer->GetSpecOrDefault();
}
}
}
template <typename ElementLike>
void DebugListAttributes(const ElementLike& aElement, nsCString& aOut) {
const uint32_t kMaxAttributeLength = 40;
uint32_t i = 0;
while (BorrowedAttrInfo info = aElement.GetAttrInfoAt(i++)) {
aOut.AppendLiteral(" ");
if (nsAtom* prefix = info.mName->GetPrefix()) {
aOut.Append(NS_ConvertUTF16toUTF8(nsDependentAtomString(prefix)));
aOut.AppendLiteral(":");
}
aOut.Append(
NS_ConvertUTF16toUTF8(nsDependentAtomString(info.mName->LocalName())));
if (!info.mValue) {
continue;
}
aOut.AppendLiteral("=\"");
nsAutoString value;
info.mValue->ToString(value);
if (value.Length() > kMaxAttributeLength) {
value.Truncate(kMaxAttributeLength - 3);
value.AppendLiteral("...");
}
aOut.Append(NS_ConvertUTF16toUTF8(value));
aOut.AppendLiteral("\"");
}
}
void Gecko_Element_DebugListAttributes(const Element* aElement,
nsCString* aOut) {
DebugListAttributes(*aElement, *aOut);
}
void Gecko_Snapshot_DebugListAttributes(const ServoElementSnapshot* aSnapshot,
nsCString* aOut) {
DebugListAttributes(*aSnapshot, *aOut);
}
NS_IMPL_THREADSAFE_FFI_REFCOUNTING(URLExtraData, URLExtraData);
void Gecko_nsStyleFont_SetLang(nsStyleFont* aFont, nsAtom* aAtom) {
aFont->mLanguage = dont_AddRef(aAtom);
aFont->mExplicitLanguage = true;
}
void Gecko_nsStyleFont_CopyLangFrom(nsStyleFont* aFont,
const nsStyleFont* aSource) {
aFont->mLanguage = aSource->mLanguage;
}
Length Gecko_nsStyleFont_ComputeMinSize(const nsStyleFont* aFont,
const Document* aDocument) {
// Don't change font-size:0, since that would un-hide hidden text.
if (aFont->mSize.IsZero()) {
return {0};
}
// Don't change it for docs where we don't enable the min-font-size.
if (!aFont->MinFontSizeEnabled()) {
return {0};
}
Length minFontSize;
bool needsCache = false;
auto MinFontSize = [&](bool* aNeedsToCache) {
const auto* prefs =
aDocument->GetFontPrefsForLang(aFont->mLanguage, aNeedsToCache);
return prefs ? prefs->mMinimumFontSize : Length{0};
};
{
AutoReadLock guard(*sServoFFILock);
minFontSize = MinFontSize(&needsCache);
}
if (needsCache) {
AutoWriteLock guard(*sServoFFILock);
minFontSize = MinFontSize(nullptr);
}
if (minFontSize.ToCSSPixels() <= 0.0f) {
return {0};
}
minFontSize.ScaleBy(aFont->mMinFontSizeRatio);
minFontSize.ScaleBy(1.0f / 100.0f);
return minFontSize;
}
static StaticRefPtr<UACacheReporter> gUACacheReporter;
namespace mozilla {
void InitializeServo() {
URLExtraData::Init();
Servo_Initialize(URLExtraData::Dummy(), URLExtraData::DummyChrome());
gUACacheReporter = new UACacheReporter();
RegisterWeakMemoryReporter(gUACacheReporter);
sServoFFILock = new RWLock("Servo::FFILock");
}
void ShutdownServo() {
MOZ_ASSERT(sServoFFILock);
UnregisterWeakMemoryReporter(gUACacheReporter);
gUACacheReporter = nullptr;
sServoFFILock = nullptr;
Servo_Shutdown();
URLExtraData::Shutdown();
}
void AssertIsMainThreadOrServoFontMetricsLocked() {
if (!NS_IsMainThread()) {
MOZ_ASSERT(sServoFFILock &&
sServoFFILock->LockedForWritingByCurrentThread());
}
}
} // namespace mozilla
GeckoFontMetrics Gecko_GetFontMetrics(const nsPresContext* aPresContext,
bool aIsVertical,
const nsStyleFont* aFont,
Length aFontSize, bool aUseUserFontSet,
bool aRetrieveMathScales) {
AutoWriteLock guard(*sServoFFILock);
// Getting font metrics can require some main thread only work to be
// done, such as work that needs to touch non-threadsafe refcounted
// objects (like the DOM FontFace/FontFaceSet objects), network loads, etc.
//
// To handle this work, font code checks whether we are in a Servo traversal
// and if so, appends PostTraversalTasks to the current ServoStyleSet
// to be performed immediately after the traversal is finished. This
// works well for starting downloadable font loads, since we don't have
// those fonts available to get metrics for anyway. Platform fonts and
// ArrayBuffer-backed FontFace objects are handled synchronously.
nsPresContext* presContext = const_cast<nsPresContext*>(aPresContext);
RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetMetricsFor(
presContext, aIsVertical, aFont, aFontSize, aUseUserFontSet);
auto* fontGroup = fm->GetThebesFontGroup();
auto metrics = fontGroup->GetMetricsForCSSUnits(fm->Orientation());
float scriptPercentScaleDown = 0;
float scriptScriptPercentScaleDown = 0;
if (aRetrieveMathScales) {
RefPtr<gfxFont> font = fontGroup->GetFirstValidFont();
if (font->TryGetMathTable()) {
scriptPercentScaleDown = static_cast<float>(
font->MathTable()->Constant(gfxMathTable::ScriptPercentScaleDown));
scriptScriptPercentScaleDown =
static_cast<float>(font->MathTable()->Constant(
gfxMathTable::ScriptScriptPercentScaleDown));
}
}
int32_t d2a = aPresContext->AppUnitsPerDevPixel();
auto ToLength = [](nscoord aLen) {
return Length::FromPixels(CSSPixel::FromAppUnits(aLen));
};
return {ToLength(NS_round(metrics.xHeight * d2a)),
ToLength(NS_round(metrics.zeroWidth * d2a)),
ToLength(NS_round(metrics.capHeight * d2a)),
ToLength(NS_round(metrics.ideographicWidth * d2a)),
ToLength(NS_round(metrics.maxAscent * d2a)),
ToLength(NS_round(fontGroup->GetStyle()->size * d2a)),
scriptPercentScaleDown,
scriptScriptPercentScaleDown};
}
NS_IMPL_THREADSAFE_FFI_REFCOUNTING(SheetLoadDataHolder, SheetLoadDataHolder);
void Gecko_StyleSheet_FinishAsyncParse(
SheetLoadDataHolder* aData,
StyleStrong<StyleStylesheetContents> aSheetContents,
StyleUseCounters* aUseCounters) {
UniquePtr<StyleUseCounters> useCounters(aUseCounters);
RefPtr<SheetLoadDataHolder> loadData = aData;
RefPtr<StyleStylesheetContents> sheetContents = aSheetContents.Consume();
NS_DispatchToMainThreadQueue(
NS_NewRunnableFunction(
__func__,
[d = std::move(loadData), contents = std::move(sheetContents),
counters = std::move(useCounters)]() mutable {
MOZ_ASSERT(NS_IsMainThread());
SheetLoadData* data = d->get();
data->mSheet->FinishAsyncParse(contents.forget(),
std::move(counters));
}),
EventQueuePriority::RenderBlocking);
}
static already_AddRefed<StyleSheet> LoadImportSheet(
Loader* aLoader, StyleSheet* aParent, SheetLoadData* aParentLoadData,
LoaderReusableStyleSheets* aReusableSheets, const StyleCssUrl& aURL,
already_AddRefed<StyleLockedMediaList> aMediaList) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aLoader, "Should've catched this before");
MOZ_ASSERT(aParent, "Only used for @import, so parent should exist!");
RefPtr<MediaList> media = new MediaList(std::move(aMediaList));
nsCOMPtr<nsIURI> uri = aURL.GetURI();
nsresult rv = uri ? NS_OK : NS_ERROR_FAILURE;
size_t previousSheetCount = aParent->ChildSheets().Length();
if (NS_SUCCEEDED(rv)) {
// TODO(emilio): We should probably make LoadChildSheet return the
// stylesheet rather than the return code.
rv = aLoader->LoadChildSheet(*aParent, aParentLoadData, uri, media,
aReusableSheets);
}
if (NS_FAILED(rv) || previousSheetCount == aParent->ChildSheets().Length()) {
// Servo and Gecko have different ideas of what a valid URL is, so we might
// get in here with a URL string that NS_NewURI can't handle. We may also
// reach here via an import cycle. For the import cycle case, we need some
// sheet object per spec, even if its empty. DevTools uses the URI to
// realize it has hit an import cycle, so we mark it complete to make the
// sheet readable from JS.
RefPtr<StyleSheet> emptySheet =
aParent->CreateEmptyChildSheet(media.forget());
// Make a dummy URI if we don't have one because some methods assume
// non-null URIs.
if (!uri) {
NS_NewURI(getter_AddRefs(uri), "about:invalid"_ns);
}
emptySheet->SetURIs(uri, uri, uri);
emptySheet->SetPrincipal(aURL.ExtraData().Principal());
nsCOMPtr<nsIReferrerInfo> referrerInfo =
ReferrerInfo::CreateForExternalCSSResources(emptySheet);
emptySheet->SetReferrerInfo(referrerInfo);
emptySheet->SetComplete();
aParent->AppendStyleSheet(*emptySheet);
return emptySheet.forget();
}
RefPtr<StyleSheet> sheet = aParent->ChildSheets().LastElement();
return sheet.forget();
}
StyleSheet* Gecko_LoadStyleSheet(Loader* aLoader, StyleSheet* aParent,
SheetLoadData* aParentLoadData,
LoaderReusableStyleSheets* aReusableSheets,
const StyleCssUrl* aUrl,
StyleStrong<StyleLockedMediaList> aMediaList) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aUrl);
return LoadImportSheet(aLoader, aParent, aParentLoadData, aReusableSheets,
*aUrl, aMediaList.Consume())
.take();
}
void Gecko_LoadStyleSheetAsync(SheetLoadDataHolder* aParentData,
const StyleCssUrl* aUrl,
StyleStrong<StyleLockedMediaList> aMediaList,
StyleStrong<StyleLockedImportRule> aImportRule) {
MOZ_ASSERT(aUrl);
RefPtr<SheetLoadDataHolder> loadData = aParentData;
RefPtr<StyleLockedMediaList> mediaList = aMediaList.Consume();
RefPtr<StyleLockedImportRule> importRule = aImportRule.Consume();
NS_DispatchToMainThreadQueue(
NS_NewRunnableFunction(
__func__,
[data = std::move(loadData), url = StyleCssUrl(*aUrl),
media = std::move(mediaList),
import = std::move(importRule)]() mutable {
MOZ_ASSERT(NS_IsMainThread());
SheetLoadData* d = data->get();
RefPtr<StyleSheet> sheet = LoadImportSheet(
d->mLoader, d->mSheet, d, nullptr, url, media.forget());
Servo_ImportRule_SetSheet(import, sheet);
}),
EventQueuePriority::RenderBlocking);
}
void Gecko_AddPropertyToSet(nsCSSPropertyIDSet* aPropertySet,
nsCSSPropertyID aProperty) {
aPropertySet->AddProperty(aProperty);
}