Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1089 insertions, 0 deletions

diff --git a/layout/style/ServoStyleConstsInlines.h b/layout/style/ServoStyleConstsInlines.h
new file mode 100644
index 0000000000..0eea3f40c0
--- /dev/null
+++ b/layout/style/ServoStyleConstsInlines.h
@@ -0,0 +1,1089 @@
+/* -*- 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/. */
+
+/* Some inline functions declared in cbindgen.toml */
+
+#ifndef mozilla_ServoStyleConstsInlines_h
+#define mozilla_ServoStyleConstsInlines_h
+
+#include "mozilla/ServoStyleConsts.h"
+#include "mozilla/AspectRatio.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/URLExtraData.h"
+#include "mozilla/dom/WorkerCommon.h"
+#include "nsGkAtoms.h"
+#include "MainThreadUtils.h"
+#include "nsNetUtil.h"
+#include <type_traits>
+#include <new>
+
+// TODO(emilio): there are quite a few other implementations scattered around
+// that should move here.
+
+namespace mozilla {
+
+// We need to explicitly instantiate these so that the clang plugin can see that
+// they're trivially copyable...
+//
+// https://github.com/eqrion/cbindgen/issues/402 tracks doing something like
+// this automatically from cbindgen.
+template struct StyleStrong<ComputedStyle>;
+template struct StyleStrong<StyleLockedCssRules>;
+template struct StyleStrong<StyleAnimationValue>;
+template struct StyleStrong<StyleLockedDeclarationBlock>;
+template struct StyleStrong<StyleStylesheetContents>;
+template struct StyleStrong<StyleLockedKeyframe>;
+template struct StyleStrong<StyleLayerBlockRule>;
+template struct StyleStrong<StyleLayerStatementRule>;
+template struct StyleStrong<StyleLockedMediaList>;
+template struct StyleStrong<StyleLockedStyleRule>;
+template struct StyleStrong<StyleLockedImportRule>;
+template struct StyleStrong<StyleLockedKeyframesRule>;
+template struct StyleStrong<StyleMediaRule>;
+template struct StyleStrong<StyleDocumentRule>;
+template struct StyleStrong<StyleNamespaceRule>;
+template struct StyleStrong<StyleLockedPageRule>;
+template struct StyleStrong<StylePropertyRule>;
+template struct StyleStrong<StyleSupportsRule>;
+template struct StyleStrong<StyleFontFeatureValuesRule>;
+template struct StyleStrong<StyleFontPaletteValuesRule>;
+template struct StyleStrong<StyleLockedFontFaceRule>;
+template struct StyleStrong<StyleLockedCounterStyleRule>;
+template struct StyleStrong<StyleContainerRule>;
+
+template <typename T>
+inline void StyleOwnedSlice<T>::Clear() {
+  if (!len) {
+    return;
+  }
+  for (size_t i : IntegerRange(len)) {
+    ptr[i].~T();
+  }
+  free(ptr);
+  ptr = (T*)alignof(T);
+  len = 0;
+}
+
+template <typename T>
+inline void StyleOwnedSlice<T>::CopyFrom(const StyleOwnedSlice& aOther) {
+  Clear();
+  len = aOther.len;
+  if (!len) {
+    ptr = (T*)alignof(T);
+  } else {
+    ptr = (T*)malloc(len * sizeof(T));
+    size_t i = 0;
+    for (const T& elem : aOther.AsSpan()) {
+      new (ptr + i++) T(elem);
+    }
+  }
+}
+
+template <typename T>
+inline void StyleOwnedSlice<T>::SwapElements(StyleOwnedSlice& aOther) {
+  std::swap(ptr, aOther.ptr);
+  std::swap(len, aOther.len);
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>::StyleOwnedSlice(const StyleOwnedSlice& aOther)
+    : StyleOwnedSlice() {
+  CopyFrom(aOther);
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>::StyleOwnedSlice(StyleOwnedSlice&& aOther)
+    : StyleOwnedSlice() {
+  SwapElements(aOther);
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>::StyleOwnedSlice(Vector<T>&& aVector)
+    : StyleOwnedSlice() {
+  if (!aVector.length()) {
+    return;
+  }
+
+  // We could handle this if Vector provided the relevant APIs, see bug 1610702.
+  MOZ_DIAGNOSTIC_ASSERT(aVector.length() == aVector.capacity(),
+                        "Shouldn't over-allocate");
+  len = aVector.length();
+  ptr = aVector.extractRawBuffer();
+  MOZ_ASSERT(ptr,
+             "How did extractRawBuffer return null if we're not using inline "
+             "capacity?");
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>& StyleOwnedSlice<T>::operator=(
+    const StyleOwnedSlice& aOther) {
+  CopyFrom(aOther);
+  return *this;
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>& StyleOwnedSlice<T>::operator=(
+    StyleOwnedSlice&& aOther) {
+  Clear();
+  SwapElements(aOther);
+  return *this;
+}
+
+template <typename T>
+inline StyleOwnedSlice<T>::~StyleOwnedSlice() {
+  Clear();
+}
+
+// This code is basically a C++ port of the Arc::clone() implementation in
+// servo/components/servo_arc/lib.rs.
+static constexpr const size_t kStaticRefcount =
+    std::numeric_limits<size_t>::max();
+static constexpr const size_t kMaxRefcount =
+    std::numeric_limits<intptr_t>::max();
+
+template <typename T>
+inline void StyleArcInner<T>::IncrementRef() {
+  if (count.load(std::memory_order_relaxed) != kStaticRefcount) {
+    auto old_size = count.fetch_add(1, std::memory_order_relaxed);
+    if (MOZ_UNLIKELY(old_size > kMaxRefcount)) {
+      ::abort();
+    }
+  }
+}
+
+// This is a C++ port-ish of Arc::drop().
+template <typename T>
+inline bool StyleArcInner<T>::DecrementRef() {
+  if (count.load(std::memory_order_relaxed) == kStaticRefcount) {
+    return false;
+  }
+  if (count.fetch_sub(1, std::memory_order_release) != 1) {
+    return false;
+  }
+#ifdef MOZ_TSAN
+  // TSan doesn't understand std::atomic_thread_fence, so in order
+  // to avoid a false positive for every time a refcounted object
+  // is deleted, we replace the fence with an atomic operation.
+  count.load(std::memory_order_acquire);
+#else
+  std::atomic_thread_fence(std::memory_order_acquire);
+#endif
+  MOZ_LOG_DTOR(this, "ServoArc", 8);
+  return true;
+}
+
+template <typename H, typename T>
+inline bool StyleHeaderSlice<H, T>::operator==(
+    const StyleHeaderSlice& aOther) const {
+  return header == aOther.header && AsSpan() == aOther.AsSpan();
+}
+
+template <typename H, typename T>
+inline bool StyleHeaderSlice<H, T>::operator!=(
+    const StyleHeaderSlice& aOther) const {
+  return !(*this == aOther);
+}
+
+template <typename H, typename T>
+inline StyleHeaderSlice<H, T>::~StyleHeaderSlice() {
+  for (T& elem : Span(data, len)) {
+    elem.~T();
+  }
+}
+
+template <typename H, typename T>
+inline Span<const T> StyleHeaderSlice<H, T>::AsSpan() const {
+  // Explicitly specify template argument here to avoid instantiating Span<T>
+  // first and then implicitly converting to Span<const T>
+  return Span<const T>{data, len};
+}
+
+static constexpr const uint64_t kArcSliceCanary = 0xf3f3f3f3f3f3f3f3;
+
+#define ASSERT_CANARY \
+  MOZ_DIAGNOSTIC_ASSERT(_0.p->data.header == kArcSliceCanary, "Uh?");
+
+template <typename T>
+inline StyleArcSlice<T>::StyleArcSlice()
+    : _0(reinterpret_cast<decltype(_0.p)>(Servo_StyleArcSlice_EmptyPtr())) {
+  ASSERT_CANARY
+}
+
+template <typename T>
+inline StyleArcSlice<T>::StyleArcSlice(
+    const StyleForgottenArcSlicePtr<T>& aPtr) {
+  // See the forget() implementation to see why reinterpret_cast() is ok.
+  _0.p = reinterpret_cast<decltype(_0.p)>(aPtr._0);
+  ASSERT_CANARY
+}
+
+template <typename T>
+inline size_t StyleArcSlice<T>::Length() const {
+  ASSERT_CANARY
+  return _0->Length();
+}
+
+template <typename T>
+inline bool StyleArcSlice<T>::IsEmpty() const {
+  ASSERT_CANARY
+  return _0->IsEmpty();
+}
+
+template <typename T>
+inline Span<const T> StyleArcSlice<T>::AsSpan() const {
+  ASSERT_CANARY
+  return _0->AsSpan();
+}
+
+#undef ASSERT_CANARY
+
+template <typename T>
+inline StyleArc<T>::StyleArc(const StyleArc& aOther) : p(aOther.p) {
+  p->IncrementRef();
+}
+
+template <typename T>
+inline void StyleArc<T>::Release() {
+  if (MOZ_LIKELY(!p->DecrementRef())) {
+    return;
+  }
+  p->data.~T();
+  free(p);
+}
+
+template <typename T>
+inline StyleArc<T>& StyleArc<T>::operator=(const StyleArc& aOther) {
+  if (p != aOther.p) {
+    Release();
+    p = aOther.p;
+    p->IncrementRef();
+  }
+  return *this;
+}
+
+template <typename T>
+inline StyleArc<T>& StyleArc<T>::operator=(StyleArc&& aOther) {
+  std::swap(p, aOther.p);
+  return *this;
+}
+
+template <typename T>
+inline StyleArc<T>::~StyleArc() {
+  Release();
+}
+
+inline bool StyleAtom::IsStatic() const { return !!(_0 & 1); }
+
+inline nsAtom* StyleAtom::AsAtom() const {
+  if (IsStatic()) {
+    auto* atom = reinterpret_cast<const nsStaticAtom*>(
+        reinterpret_cast<const uint8_t*>(&detail::gGkAtoms) + (_0 >> 1));
+    MOZ_ASSERT(atom->IsStatic());
+    return const_cast<nsStaticAtom*>(atom);
+  }
+  return reinterpret_cast<nsAtom*>(_0);
+}
+
+inline void StyleAtom::AddRef() {
+  if (!IsStatic()) {
+    AsAtom()->AddRef();
+  }
+}
+
+inline void StyleAtom::Release() {
+  if (!IsStatic()) {
+    AsAtom()->Release();
+  }
+}
+
+inline StyleAtom::StyleAtom(already_AddRefed<nsAtom> aAtom) {
+  nsAtom* atom = aAtom.take();
+  if (atom->IsStatic()) {
+    ptrdiff_t offset = reinterpret_cast<const uint8_t*>(atom->AsStatic()) -
+                       reinterpret_cast<const uint8_t*>(&detail::gGkAtoms);
+    _0 = (offset << 1) | 1;
+  } else {
+    _0 = reinterpret_cast<uintptr_t>(atom);
+  }
+  MOZ_ASSERT(IsStatic() == atom->IsStatic());
+  MOZ_ASSERT(AsAtom() == atom);
+}
+
+inline StyleAtom::StyleAtom(const StyleAtom& aOther) : _0(aOther._0) {
+  AddRef();
+}
+
+inline StyleAtom& StyleAtom::operator=(const StyleAtom& aOther) {
+  if (MOZ_LIKELY(this != &aOther)) {
+    Release();
+    _0 = aOther._0;
+    AddRef();
+  }
+  return *this;
+}
+
+inline StyleAtom::~StyleAtom() { Release(); }
+
+inline nsAtom* StyleCustomIdent::AsAtom() const { return _0.AsAtom(); }
+
+inline nsDependentCSubstring StyleOwnedStr::AsString() const {
+  Span<const uint8_t> s = _0.AsSpan();
+  return nsDependentCSubstring(reinterpret_cast<const char*>(s.Elements()),
+                               s.Length());
+}
+
+template <typename T>
+inline Span<const T> StyleGenericTransform<T>::Operations() const {
+  return _0.AsSpan();
+}
+
+template <typename T>
+inline bool StyleGenericTransform<T>::IsNone() const {
+  return Operations().IsEmpty();
+}
+
+inline StyleAngle StyleAngle::Zero() { return {0.0f}; }
+
+inline float StyleAngle::ToDegrees() const { return _0; }
+
+inline double StyleAngle::ToRadians() const {
+  return double(ToDegrees()) * M_PI / 180.0;
+}
+
+inline bool StyleUrlExtraData::IsShared() const { return !!(_0 & 1); }
+
+inline StyleUrlExtraData::~StyleUrlExtraData() {
+  if (!IsShared()) {
+    reinterpret_cast<URLExtraData*>(_0)->Release();
+  }
+}
+
+inline const URLExtraData& StyleUrlExtraData::get() const {
+  if (IsShared()) {
+    return *URLExtraData::sShared[_0 >> 1].get();
+  }
+  return *reinterpret_cast<const URLExtraData*>(_0);
+}
+
+inline nsDependentCSubstring StyleCssUrl::SpecifiedSerialization() const {
+  return _0->serialization.AsString();
+}
+
+inline const URLExtraData& StyleCssUrl::ExtraData() const {
+  return _0->extra_data.get();
+}
+
+inline StyleLoadData& StyleCssUrl::LoadData() const {
+  if (MOZ_LIKELY(_0->load_data.tag == StyleLoadDataSource::Tag::Owned)) {
+    MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread() ||
+                          dom::IsCurrentThreadRunningWorker());
+    return const_cast<StyleLoadData&>(_0->load_data.owned._0);
+  }
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread(),
+                        "Lazy load datas should come from user-agent sheets, "
+                        "which don't make sense on workers");
+  return const_cast<StyleLoadData&>(*Servo_LoadData_GetLazy(&_0->load_data));
+}
+
+inline nsIURI* StyleCssUrl::GetURI() const {
+  auto& loadData = LoadData();
+  if (!(loadData.flags & StyleLoadDataFlags::TRIED_TO_RESOLVE_URI)) {
+    loadData.flags |= StyleLoadDataFlags::TRIED_TO_RESOLVE_URI;
+    nsDependentCSubstring serialization = SpecifiedSerialization();
+    // https://drafts.csswg.org/css-values-4/#url-empty:
+    //
+    //     If the value of the url() is the empty string (like url("") or
+    //     url()), the url must resolve to an invalid resource (similar to what
+    //     the url about:invalid does).
+    //
+    if (!serialization.IsEmpty()) {
+      RefPtr<nsIURI> resolved;
+      NS_NewURI(getter_AddRefs(resolved), serialization, nullptr,
+                ExtraData().BaseURI());
+      loadData.resolved_uri = resolved.forget().take();
+    }
+  }
+  return loadData.resolved_uri;
+}
+
+inline nsDependentCSubstring StyleComputedUrl::SpecifiedSerialization() const {
+  return _0.SpecifiedSerialization();
+}
+inline const URLExtraData& StyleComputedUrl::ExtraData() const {
+  return _0.ExtraData();
+}
+inline StyleLoadData& StyleComputedUrl::LoadData() const {
+  return _0.LoadData();
+}
+inline StyleCorsMode StyleComputedUrl::CorsMode() const {
+  return _0._0->cors_mode;
+}
+inline nsIURI* StyleComputedUrl::GetURI() const { return _0.GetURI(); }
+
+inline bool StyleComputedUrl::IsLocalRef() const {
+  return Servo_CssUrl_IsLocalRef(&_0);
+}
+
+inline bool StyleComputedUrl::HasRef() const {
+  if (IsLocalRef()) {
+    return true;
+  }
+  if (nsIURI* uri = GetURI()) {
+    bool hasRef = false;
+    return NS_SUCCEEDED(uri->GetHasRef(&hasRef)) && hasRef;
+  }
+  return false;
+}
+
+inline bool StyleComputedImageUrl::IsImageResolved() const {
+  return bool(LoadData().flags & StyleLoadDataFlags::TRIED_TO_RESOLVE_IMAGE);
+}
+
+inline imgRequestProxy* StyleComputedImageUrl::GetImage() const {
+  MOZ_ASSERT(IsImageResolved());
+  return LoadData().resolved_image;
+}
+
+template <>
+inline bool StyleGradient::Repeating() const {
+  if (IsLinear()) {
+    return AsLinear().repeating;
+  }
+  if (IsRadial()) {
+    return AsRadial().repeating;
+  }
+  return AsConic().repeating;
+}
+
+template <>
+bool StyleGradient::IsOpaque() const;
+
+template <typename Integer>
+inline StyleGenericGridLine<Integer>::StyleGenericGridLine()
+    : ident(do_AddRef(static_cast<nsAtom*>(nsGkAtoms::_empty))),
+      line_num(0),
+      is_span(false) {}
+
+template <>
+inline nsAtom* StyleGridLine::LineName() const {
+  return ident.AsAtom();
+}
+
+template <>
+inline bool StyleGridLine::IsAuto() const {
+  return LineName()->IsEmpty() && line_num == 0 && !is_span;
+}
+
+using LengthPercentage = StyleLengthPercentage;
+using LengthPercentageOrAuto = StyleLengthPercentageOrAuto;
+using NonNegativeLengthPercentage = StyleNonNegativeLengthPercentage;
+using NonNegativeLengthPercentageOrAuto =
+    StyleNonNegativeLengthPercentageOrAuto;
+using NonNegativeLengthPercentageOrNormal =
+    StyleNonNegativeLengthPercentageOrNormal;
+using Length = StyleLength;
+using LengthOrAuto = StyleLengthOrAuto;
+using NonNegativeLength = StyleNonNegativeLength;
+using NonNegativeLengthOrAuto = StyleNonNegativeLengthOrAuto;
+using BorderRadius = StyleBorderRadius;
+
+bool StyleCSSPixelLength::IsZero() const { return _0 == 0.0f; }
+
+void StyleCSSPixelLength::ScaleBy(float aScale) { _0 *= aScale; }
+
+StyleCSSPixelLength StyleCSSPixelLength::ScaledBy(float aScale) const {
+  return FromPixels(ToCSSPixels() * aScale);
+}
+
+nscoord StyleCSSPixelLength::ToAppUnits() const {
+  // We want to resolve the length part of the calc() expression rounding 0.5
+  // away from zero, instead of the default behavior of
+  // NSToCoordRound{,WithClamp} which do floor(x + 0.5).
+  //
+  // This is what the rust code in the app_units crate does, and not doing this
+  // would regress bug 1323735, for example.
+  //
+  // FIXME(emilio, bug 1528114): Probably we should do something smarter.
+  if (IsZero()) {
+    // Avoid the expensive FP math below.
+    return 0;
+  }
+  float length = _0 * float(mozilla::AppUnitsPerCSSPixel());
+  if (length >= float(nscoord_MAX)) {
+    return nscoord_MAX;
+  }
+  if (length <= float(nscoord_MIN)) {
+    return nscoord_MIN;
+  }
+  return NSToIntRound(length);
+}
+
+bool LengthPercentage::IsLength() const { return Tag() == TAG_LENGTH; }
+
+StyleLengthPercentageUnion::StyleLengthPercentageUnion() {
+  length = {TAG_LENGTH, {0.0f}};
+  MOZ_ASSERT(IsLength());
+}
+
+static_assert(sizeof(LengthPercentage) == sizeof(uint64_t), "");
+
+Length& LengthPercentage::AsLength() {
+  MOZ_ASSERT(IsLength());
+  return length.length;
+}
+
+const Length& LengthPercentage::AsLength() const {
+  return const_cast<LengthPercentage*>(this)->AsLength();
+}
+
+bool LengthPercentage::IsPercentage() const { return Tag() == TAG_PERCENTAGE; }
+
+StylePercentage& LengthPercentage::AsPercentage() {
+  MOZ_ASSERT(IsPercentage());
+  return percentage.percentage;
+}
+
+const StylePercentage& LengthPercentage::AsPercentage() const {
+  return const_cast<LengthPercentage*>(this)->AsPercentage();
+}
+
+bool LengthPercentage::IsCalc() const { return Tag() == TAG_CALC; }
+
+StyleCalcLengthPercentage& LengthPercentage::AsCalc() {
+  MOZ_ASSERT(IsCalc());
+  // NOTE: in 32-bits, the pointer is not swapped, and goes along with the tag.
+#ifdef SERVO_32_BITS
+  return *calc.ptr;
+#else
+  return *reinterpret_cast<StyleCalcLengthPercentage*>(
+      NativeEndian::swapFromLittleEndian(calc.ptr));
+#endif
+}
+
+const StyleCalcLengthPercentage& LengthPercentage::AsCalc() const {
+  return const_cast<LengthPercentage*>(this)->AsCalc();
+}
+
+StyleLengthPercentageUnion::StyleLengthPercentageUnion(const Self& aOther) {
+  if (aOther.IsLength()) {
+    length = {TAG_LENGTH, aOther.AsLength()};
+  } else if (aOther.IsPercentage()) {
+    percentage = {TAG_PERCENTAGE, aOther.AsPercentage()};
+  } else {
+    MOZ_ASSERT(aOther.IsCalc());
+    auto* ptr = new StyleCalcLengthPercentage(aOther.AsCalc());
+    // NOTE: in 32-bits, the pointer is not swapped, and goes along with the
+    // tag.
+    calc = {
+#ifdef SERVO_32_BITS
+        TAG_CALC,
+        ptr,
+#else
+        NativeEndian::swapToLittleEndian(reinterpret_cast<uintptr_t>(ptr)),
+#endif
+    };
+  }
+  MOZ_ASSERT(Tag() == aOther.Tag());
+}
+
+StyleLengthPercentageUnion::~StyleLengthPercentageUnion() {
+  if (IsCalc()) {
+    delete &AsCalc();
+  }
+}
+
+LengthPercentage& LengthPercentage::operator=(const LengthPercentage& aOther) {
+  if (this != &aOther) {
+    this->~LengthPercentage();
+    new (this) LengthPercentage(aOther);
+  }
+  return *this;
+}
+
+bool LengthPercentage::operator==(const LengthPercentage& aOther) const {
+  if (Tag() != aOther.Tag()) {
+    return false;
+  }
+  if (IsLength()) {
+    return AsLength() == aOther.AsLength();
+  }
+  if (IsPercentage()) {
+    return AsPercentage() == aOther.AsPercentage();
+  }
+  return AsCalc() == aOther.AsCalc();
+}
+
+bool LengthPercentage::operator!=(const LengthPercentage& aOther) const {
+  return !(*this == aOther);
+}
+
+LengthPercentage LengthPercentage::Zero() { return {}; }
+
+LengthPercentage LengthPercentage::FromPixels(CSSCoord aCoord) {
+  LengthPercentage l;
+  MOZ_ASSERT(l.IsLength());
+  l.length.length = {aCoord};
+  return l;
+}
+
+LengthPercentage LengthPercentage::FromAppUnits(nscoord aCoord) {
+  return FromPixels(CSSPixel::FromAppUnits(aCoord));
+}
+
+LengthPercentage LengthPercentage::FromPercentage(float aPercentage) {
+  LengthPercentage l;
+  l.percentage = {TAG_PERCENTAGE, {aPercentage}};
+  return l;
+}
+
+bool LengthPercentage::HasPercent() const { return IsPercentage() || IsCalc(); }
+
+bool LengthPercentage::ConvertsToLength() const { return IsLength(); }
+
+nscoord LengthPercentage::ToLength() const {
+  MOZ_ASSERT(ConvertsToLength());
+  return AsLength().ToAppUnits();
+}
+
+CSSCoord LengthPercentage::ToLengthInCSSPixels() const {
+  MOZ_ASSERT(ConvertsToLength());
+  return AsLength().ToCSSPixels();
+}
+
+bool LengthPercentage::ConvertsToPercentage() const { return IsPercentage(); }
+
+float LengthPercentage::ToPercentage() const {
+  MOZ_ASSERT(ConvertsToPercentage());
+  return AsPercentage()._0;
+}
+
+bool LengthPercentage::HasLengthAndPercentage() const {
+  if (!IsCalc()) {
+    return false;
+  }
+  MOZ_ASSERT(!ConvertsToLength() && !ConvertsToPercentage(),
+             "Should've been simplified earlier");
+  return true;
+}
+
+bool LengthPercentage::IsDefinitelyZero() const {
+  if (IsLength()) {
+    return AsLength().IsZero();
+  }
+  if (IsPercentage()) {
+    return AsPercentage()._0 == 0.0f;
+  }
+  // calc() should've been simplified to a percentage.
+  return false;
+}
+
+template <>
+CSSCoord StyleCalcNode::ResolveToCSSPixels(CSSCoord aPercentageBasis) const;
+
+template <>
+void StyleCalcNode::ScaleLengthsBy(float);
+
+CSSCoord LengthPercentage::ResolveToCSSPixels(CSSCoord aPercentageBasis) const {
+  if (IsLength()) {
+    return AsLength().ToCSSPixels();
+  }
+  if (IsPercentage()) {
+    return AsPercentage()._0 * aPercentageBasis;
+  }
+  return AsCalc().node.ResolveToCSSPixels(aPercentageBasis);
+}
+
+template <typename T>
+CSSCoord LengthPercentage::ResolveToCSSPixelsWith(T aPercentageGetter) const {
+  static_assert(std::is_same<decltype(aPercentageGetter()), CSSCoord>::value,
+                "Should return CSS pixels");
+  if (ConvertsToLength()) {
+    return ToLengthInCSSPixels();
+  }
+  return ResolveToCSSPixels(aPercentageGetter());
+}
+
+template <typename T, typename U>
+nscoord LengthPercentage::Resolve(T aPercentageGetter, U aRounder) const {
+  static_assert(std::is_same<decltype(aPercentageGetter()), nscoord>::value,
+                "Should return app units");
+  static_assert(std::is_same<decltype(aRounder(1.0f)), nscoord>::value,
+                "Should return app units");
+  if (ConvertsToLength()) {
+    return ToLength();
+  }
+  if (IsPercentage() && AsPercentage()._0 == 0.0f) {
+    return 0.0f;
+  }
+  nscoord basis = aPercentageGetter();
+  if (IsPercentage()) {
+    return aRounder(basis * AsPercentage()._0);
+  }
+  return AsCalc().node.Resolve(basis, aRounder);
+}
+
+// Note: the static_cast<> wrappers below are needed to disambiguate between
+// the versions of NSToCoordTruncClamped that take float vs. double as the arg.
+nscoord LengthPercentage::Resolve(nscoord aPercentageBasis) const {
+  return Resolve([=] { return aPercentageBasis; },
+                 static_cast<nscoord (*)(float)>(NSToCoordTruncClamped));
+}
+
+template <typename T>
+nscoord LengthPercentage::Resolve(T aPercentageGetter) const {
+  return Resolve(aPercentageGetter,
+                 static_cast<nscoord (*)(float)>(NSToCoordTruncClamped));
+}
+
+template <typename T>
+nscoord LengthPercentage::Resolve(nscoord aPercentageBasis,
+                                  T aPercentageRounder) const {
+  return Resolve([aPercentageBasis] { return aPercentageBasis; },
+                 aPercentageRounder);
+}
+
+void LengthPercentage::ScaleLengthsBy(float aScale) {
+  if (IsLength()) {
+    AsLength().ScaleBy(aScale);
+  }
+  if (IsCalc()) {
+    AsCalc().node.ScaleLengthsBy(aScale);
+  }
+}
+
+#define IMPL_LENGTHPERCENTAGE_FORWARDS(ty_)                                 \
+  template <>                                                               \
+  inline bool ty_::HasPercent() const {                                     \
+    return IsLengthPercentage() && AsLengthPercentage().HasPercent();       \
+  }                                                                         \
+  template <>                                                               \
+  inline bool ty_::ConvertsToLength() const {                               \
+    return IsLengthPercentage() && AsLengthPercentage().ConvertsToLength(); \
+  }                                                                         \
+  template <>                                                               \
+  inline bool ty_::HasLengthAndPercentage() const {                         \
+    return IsLengthPercentage() &&                                          \
+           AsLengthPercentage().HasLengthAndPercentage();                   \
+  }                                                                         \
+  template <>                                                               \
+  inline nscoord ty_::ToLength() const {                                    \
+    MOZ_ASSERT(ConvertsToLength());                                         \
+    return AsLengthPercentage().ToLength();                                 \
+  }                                                                         \
+  template <>                                                               \
+  inline bool ty_::ConvertsToPercentage() const {                           \
+    return IsLengthPercentage() &&                                          \
+           AsLengthPercentage().ConvertsToPercentage();                     \
+  }                                                                         \
+  template <>                                                               \
+  inline float ty_::ToPercentage() const {                                  \
+    MOZ_ASSERT(ConvertsToPercentage());                                     \
+    return AsLengthPercentage().ToPercentage();                             \
+  }
+
+IMPL_LENGTHPERCENTAGE_FORWARDS(LengthPercentageOrAuto)
+IMPL_LENGTHPERCENTAGE_FORWARDS(StyleSize)
+IMPL_LENGTHPERCENTAGE_FORWARDS(StyleMaxSize)
+
+template <>
+inline bool LengthOrAuto::IsLength() const {
+  return IsLengthPercentage();
+}
+
+template <>
+inline const Length& LengthOrAuto::AsLength() const {
+  return AsLengthPercentage();
+}
+
+template <>
+inline nscoord LengthOrAuto::ToLength() const {
+  return AsLength().ToAppUnits();
+}
+
+template <>
+inline bool StyleFlexBasis::IsAuto() const {
+  return IsSize() && AsSize().IsAuto();
+}
+
+template <>
+inline bool StyleSize::BehavesLikeInitialValueOnBlockAxis() const {
+  return IsAuto() || !IsLengthPercentage();
+}
+
+template <>
+inline bool StyleMaxSize::BehavesLikeInitialValueOnBlockAxis() const {
+  return IsNone() || !IsLengthPercentage();
+}
+
+template <>
+inline bool StyleBackgroundSize::IsInitialValue() const {
+  return IsExplicitSize() && explicit_size.width.IsAuto() &&
+         explicit_size.height.IsAuto();
+}
+
+template <typename T>
+const T& StyleRect<T>::Get(mozilla::Side aSide) const {
+  static_assert(sizeof(StyleRect<T>) == sizeof(T) * 4, "");
+  static_assert(alignof(StyleRect<T>) == alignof(T), "");
+  return reinterpret_cast<const T*>(this)[aSide];
+}
+
+template <typename T>
+T& StyleRect<T>::Get(mozilla::Side aSide) {
+  return const_cast<T&>(static_cast<const StyleRect&>(*this).Get(aSide));
+}
+
+template <typename T>
+template <typename Predicate>
+bool StyleRect<T>::All(Predicate aPredicate) const {
+  return aPredicate(_0) && aPredicate(_1) && aPredicate(_2) && aPredicate(_3);
+}
+
+template <typename T>
+template <typename Predicate>
+bool StyleRect<T>::Any(Predicate aPredicate) const {
+  return aPredicate(_0) || aPredicate(_1) || aPredicate(_2) || aPredicate(_3);
+}
+
+template <>
+inline const LengthPercentage& BorderRadius::Get(HalfCorner aCorner) const {
+  static_assert(sizeof(BorderRadius) == sizeof(LengthPercentage) * 8, "");
+  static_assert(alignof(BorderRadius) == alignof(LengthPercentage), "");
+  auto* self = reinterpret_cast<const LengthPercentage*>(this);
+  return self[aCorner];
+}
+
+template <>
+inline bool StyleTrackBreadth::HasPercent() const {
+  return IsBreadth() && AsBreadth().HasPercent();
+}
+
+// Implemented in nsStyleStructs.cpp
+template <>
+bool StyleTransform::HasPercent() const;
+
+template <>
+inline bool StyleTransformOrigin::HasPercent() const {
+  // NOTE(emilio): `depth` is just a `<length>` so doesn't have a percentage at
+  // all.
+  return horizontal.HasPercent() || vertical.HasPercent();
+}
+
+template <>
+inline Maybe<size_t> StyleGridTemplateComponent::RepeatAutoIndex() const {
+  if (!IsTrackList()) {
+    return Nothing();
+  }
+  auto& list = *AsTrackList();
+  return list.auto_repeat_index < list.values.Length()
+             ? Some(list.auto_repeat_index)
+             : Nothing();
+}
+
+template <>
+inline bool StyleGridTemplateComponent::HasRepeatAuto() const {
+  return RepeatAutoIndex().isSome();
+}
+
+template <>
+inline Span<const StyleGenericTrackListValue<LengthPercentage, StyleInteger>>
+StyleGridTemplateComponent::TrackListValues() const {
+  if (IsTrackList()) {
+    return AsTrackList()->values.AsSpan();
+  }
+  return {};
+}
+
+template <>
+inline const StyleGenericTrackRepeat<LengthPercentage, StyleInteger>*
+StyleGridTemplateComponent::GetRepeatAutoValue() const {
+  auto index = RepeatAutoIndex();
+  if (!index) {
+    return nullptr;
+  }
+  return &TrackListValues()[*index].AsTrackRepeat();
+}
+
+constexpr const auto kPaintOrderShift = StylePAINT_ORDER_SHIFT;
+constexpr const auto kPaintOrderMask = StylePAINT_ORDER_MASK;
+
+template <>
+inline nsRect StyleGenericClipRect<LengthOrAuto>::ToLayoutRect(
+    nscoord aAutoSize) const {
+  nscoord x = left.IsLength() ? left.ToLength() : 0;
+  nscoord y = top.IsLength() ? top.ToLength() : 0;
+  nscoord width = right.IsLength() ? right.ToLength() - x : aAutoSize;
+  nscoord height = bottom.IsLength() ? bottom.ToLength() - y : aAutoSize;
+  return nsRect(x, y, width, height);
+}
+
+using RestyleHint = StyleRestyleHint;
+
+inline RestyleHint RestyleHint::RestyleSubtree() {
+  return RESTYLE_SELF | RESTYLE_DESCENDANTS;
+}
+
+inline RestyleHint RestyleHint::RecascadeSubtree() {
+  return RECASCADE_SELF | RECASCADE_DESCENDANTS;
+}
+
+inline RestyleHint RestyleHint::ForAnimations() {
+  return RESTYLE_CSS_TRANSITIONS | RESTYLE_CSS_ANIMATIONS | RESTYLE_SMIL;
+}
+
+inline bool RestyleHint::DefinitelyRecascadesAllSubtree() const {
+  if (!(*this & (RECASCADE_DESCENDANTS | RESTYLE_DESCENDANTS))) {
+    return false;
+  }
+  return bool(*this & (RESTYLE_SELF | RECASCADE_SELF));
+}
+
+template <>
+ImageResolution StyleImage::GetResolution() const;
+
+template <>
+inline const StyleImage& StyleImage::FinalImage() const {
+  if (!IsImageSet()) {
+    return *this;
+  }
+  auto& set = *AsImageSet();
+  auto items = set.items.AsSpan();
+  if (MOZ_LIKELY(set.selected_index < items.Length())) {
+    return items[set.selected_index].image.FinalImage();
+  }
+  static auto sNone = StyleImage::None();
+  return sNone;
+}
+
+template <>
+Maybe<CSSIntSize> StyleImage::GetIntrinsicSize() const;
+
+template <>
+inline bool StyleImage::IsImageRequestType() const {
+  auto& finalImage = FinalImage();
+  return finalImage.IsUrl() || finalImage.IsRect();
+}
+
+template <>
+inline const StyleComputedImageUrl* StyleImage::GetImageRequestURLValue()
+    const {
+  auto& finalImage = FinalImage();
+  if (finalImage.IsUrl()) {
+    return &finalImage.AsUrl();
+  }
+  if (finalImage.IsRect()) {
+    return &finalImage.AsRect()->url;
+  }
+  return nullptr;
+}
+
+template <>
+inline imgRequestProxy* StyleImage::GetImageRequest() const {
+  auto* url = GetImageRequestURLValue();
+  return url ? url->GetImage() : nullptr;
+}
+
+template <>
+inline bool StyleImage::IsResolved() const {
+  auto* url = GetImageRequestURLValue();
+  return !url || url->IsImageResolved();
+}
+
+template <>
+bool StyleImage::IsOpaque() const;
+template <>
+bool StyleImage::IsSizeAvailable() const;
+template <>
+bool StyleImage::IsComplete() const;
+template <>
+Maybe<StyleImage::ActualCropRect> StyleImage::ComputeActualCropRect() const;
+template <>
+void StyleImage::ResolveImage(dom::Document&, const StyleImage*);
+
+template <>
+inline AspectRatio StyleRatio<StyleNonNegativeNumber>::ToLayoutRatio(
+    UseBoxSizing aUseBoxSizing) const {
+  // 0/1, 1/0, and 0/0 are all degenerate ratios (which behave as auto), and we
+  // always return 0.0f.
+  // https://drafts.csswg.org/css-values-4/#degenerate-ratio
+  return AspectRatio::FromSize(_0, _1, aUseBoxSizing);
+}
+
+template <>
+inline AspectRatio StyleAspectRatio::ToLayoutRatio() const {
+  return HasRatio() ? ratio.AsRatio().ToLayoutRatio(auto_ ? UseBoxSizing::No
+                                                          : UseBoxSizing::Yes)
+                    : AspectRatio();
+}
+
+inline void StyleFontWeight::ToString(nsACString& aString) const {
+  Servo_FontWeight_ToCss(this, &aString);
+}
+
+inline void StyleFontStretch::ToString(nsACString& aString) const {
+  Servo_FontStretch_ToCss(this, &aString);
+}
+
+inline void StyleFontStyle::ToString(nsACString& aString) const {
+  Servo_FontStyle_ToCss(this, &aString);
+}
+
+inline bool StyleFontWeight::IsBold() const { return *this >= BOLD_THRESHOLD; }
+
+inline bool StyleFontStyle::IsItalic() const { return *this == ITALIC; }
+
+inline bool StyleFontStyle::IsOblique() const {
+  return !IsItalic() && !IsNormal();
+}
+
+inline float StyleFontStyle::ObliqueAngle() const {
+  MOZ_ASSERT(IsOblique());
+  return ToFloat();
+}
+
+inline float StyleFontStyle::SlantAngle() const {
+  return IsNormal() ? 0 : IsItalic() ? DEFAULT_OBLIQUE_DEGREES : ObliqueAngle();
+}
+
+using FontStretch = StyleFontStretch;
+using FontSlantStyle = StyleFontStyle;
+using FontWeight = StyleFontWeight;
+
+template <>
+inline double StyleComputedTimingFunction::At(double aPortion,
+                                              bool aBeforeFlag) const {
+  return Servo_EasingFunctionAt(
+      this, aPortion,
+      aBeforeFlag ? StyleEasingBeforeFlag::Set : StyleEasingBeforeFlag::Unset);
+}
+
+template <>
+inline void StyleComputedTimingFunction::AppendToString(
+    nsACString& aOut) const {
+  return Servo_SerializeEasing(this, &aOut);
+}
+
+template <>
+inline double StyleComputedTimingFunction::GetPortion(
+    const Maybe<StyleComputedTimingFunction>& aFn, double aPortion,
+    bool aBeforeFlag) {
+  return aFn ? aFn->At(aPortion, aBeforeFlag) : aPortion;
+}
+
+/* static */
+template <>
+inline LengthPercentageOrAuto LengthPercentageOrAuto::Zero() {
+  return LengthPercentage(LengthPercentage::Zero());
+}
+
+template <>
+inline StyleViewTimelineInset::StyleGenericViewTimelineInset()
+    : start(LengthPercentageOrAuto::Auto()),
+      end(LengthPercentageOrAuto::Auto()) {}
+
+}  // namespace mozilla
+
+#endif