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Minimal test - lines (25, 37)

Code

RemoteLookAndFeel::RemoteLookAndFeel(FullLookAndFeel&& aData)
    : mTables(std::move(aData.tables())) {
  MOZ_ASSERT(XRE_IsContentProcess(),
             "Only content processes should be using a RemoteLookAndFeel");

#ifdef MOZ_WIDGET_GTK
  if (!StaticPrefs::widget_non_native_theme_enabled()) {
    // Configure the theme in this content process with the Gtk theme that was
    // chosen by WithThemeConfiguredForContent in the parent process.
    nsLookAndFeel::ConfigureTheme(aData.theme());
  }
#endif
}

Minimal test - lines (23, 265)

Code

namespace mozilla::widget {

RemoteLookAndFeel::RemoteLookAndFeel(FullLookAndFeel&& aData)
    : mTables(std::move(aData.tables())) {
  MOZ_ASSERT(XRE_IsContentProcess(),
             "Only content processes should be using a RemoteLookAndFeel");

#ifdef MOZ_WIDGET_GTK
  if (!StaticPrefs::widget_non_native_theme_enabled()) {
    // Configure the theme in this content process with the Gtk theme that was
    // chosen by WithThemeConfiguredForContent in the parent process.
    nsLookAndFeel::ConfigureTheme(aData.theme());
  }
#endif
}

RemoteLookAndFeel::~RemoteLookAndFeel() = default;

void RemoteLookAndFeel::SetDataImpl(FullLookAndFeel&& aData) {
  MOZ_ASSERT(XRE_IsContentProcess(),
             "Only content processes should be using a RemoteLookAndFeel");
  MOZ_ASSERT(NS_IsMainThread());
  mTables = std::move(aData.tables());

#ifdef MOZ_WIDGET_GTK
  if (!StaticPrefs::widget_non_native_theme_enabled()) {
    // Configure the theme in this content process with the Gtk theme that was
    // chosen by WithThemeConfiguredForContent in the parent process.
    nsLookAndFeel::ConfigureTheme(aData.theme());
  }
#endif
}

namespace {

template 
Result MapLookup(const nsTArray& aItems,
                                        const nsTArray& aMap, ID aID,
                                        ID aMinimum = ID(0)) {
  UInt mapped = aMap[static_cast(aID) - static_cast(aMinimum)];

  if (mapped == std::numeric_limits::max()) {
    return Err(NS_ERROR_NOT_IMPLEMENTED);
  }

  return &aItems[static_cast(mapped)];
}

template 
void AddToMap(nsTArray* aItems, nsTArray* aMap,
              Maybe&& aNewItem) {
  if (aNewItem.isNothing()) {
    aMap->AppendElement(std::numeric_limits::max());
    return;
  }

  size_t newIndex = aItems->Length();
  MOZ_ASSERT(newIndex < std::numeric_limits::max());

  // Check if there is an existing value in aItems that we can point to.
  //
  // The arrays should be small enough and contain few enough unique
  // values that sequential search here is reasonable.
  for (size_t i = 0; i < newIndex; ++i) {
    if ((*aItems)[i] == aNewItem.ref()) {
      aMap->AppendElement(static_cast(i));
      return;
    }
  }

  aItems->AppendElement(aNewItem.extract());
  aMap->AppendElement(static_cast(newIndex));
}

}  // namespace

nsresult RemoteLookAndFeel::NativeGetColor(ColorID aID, nscolor& aResult) {
  const nscolor* result;
  MOZ_TRY_VAR(result, MapLookup(mTables.colors(), mTables.colorMap(), aID));
  aResult = *result;
  return NS_OK;
}

nsresult RemoteLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
  const int32_t* result;
  MOZ_TRY_VAR(result, MapLookup(mTables.ints(), mTables.intMap(), aID));
  aResult = *result;
  return NS_OK;
}

nsresult RemoteLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
  const float* result;
  MOZ_TRY_VAR(result, MapLookup(mTables.floats(), mTables.floatMap(), aID));
  aResult = *result;
  return NS_OK;
}

bool RemoteLookAndFeel::NativeGetFont(FontID aID, nsString& aFontName,
                                      gfxFontStyle& aFontStyle) {
  auto result =
      MapLookup(mTables.fonts(), mTables.fontMap(), aID, FontID::MINIMUM);
  if (result.isErr()) {
    return false;
  }

  const LookAndFeelFont& font = *result.unwrap();
  MOZ_ASSERT(font.haveFont());
  aFontName = font.name();
  aFontStyle = gfxFontStyle();
  aFontStyle.size = font.size();
  aFontStyle.weight = FontWeight(font.weight());
  aFontStyle.style =
      font.italic() ? FontSlantStyle::Italic() : FontSlantStyle::Normal();

  return true;
}

char16_t RemoteLookAndFeel::GetPasswordCharacterImpl() {
  return static_cast(mTables.passwordChar());
}

bool RemoteLookAndFeel::GetEchoPasswordImpl() { return mTables.passwordEcho(); }

// static
const FullLookAndFeel* RemoteLookAndFeel::ExtractData() {
  MOZ_ASSERT(XRE_IsParentProcess(),
             "Only parent processes should be extracting LookAndFeel data");

  if (sCachedLookAndFeelData) {
    return sCachedLookAndFeelData;
  }

  static bool sInitialized = false;
  if (!sInitialized) {
    sInitialized = true;
    ClearOnShutdown(&sCachedLookAndFeelData);
  }

  FullLookAndFeel* lf = new FullLookAndFeel{};
  nsXPLookAndFeel* impl = nsXPLookAndFeel::GetInstance();

  int32_t darkTheme = 0;
  int32_t accessibilityTheme = 0;
  impl->NativeGetInt(IntID::SystemUsesDarkTheme, darkTheme);
  impl->NativeGetInt(IntID::UseAccessibilityTheme, accessibilityTheme);

  impl->WithThemeConfiguredForContent([&](const LookAndFeelTheme& aTheme) {
    for (auto id : MakeEnumeratedRange(IntID::End)) {
      int32_t theInt;
      nsresult rv;
      // We want to take SystemUsesDarkTheme and UseAccessibilityTheme from
      // the parent process theme rather than the content configured theme.
      // This ensures that media queries like (prefers-color-scheme: dark) will
      // match correctly in content processes.
      //
      // (When the RemoteLookAndFeel is not in use, the LookAndFeelCache
      // ensures we get these values from the parent process theme.)
      switch (id) {
        case IntID::SystemUsesDarkTheme:
          theInt = darkTheme;
          rv = NS_OK;
          break;
        case IntID::UseAccessibilityTheme:
          theInt = accessibilityTheme;
          rv = NS_OK;
          break;
        default:
          rv = impl->NativeGetInt(id, theInt);
          break;
      }
      AddToMap(&lf->tables().ints(), &lf->tables().intMap(),
               NS_SUCCEEDED(rv) ? Some(theInt) : Nothing{});
    }

    for (auto id : MakeEnumeratedRange(FloatID::End)) {
      float theFloat;
      nsresult rv = impl->NativeGetFloat(id, theFloat);
      AddToMap(&lf->tables().floats(), &lf->tables().floatMap(),
               NS_SUCCEEDED(rv) ? Some(theFloat) : Nothing{});
    }

    for (auto id : MakeEnumeratedRange(ColorID::End)) {
      nscolor theColor;
      nsresult rv = impl->NativeGetColor(id, theColor);
      AddToMap(&lf->tables().colors(), &lf->tables().colorMap(),
               NS_SUCCEEDED(rv) ? Some(theColor) : Nothing{});
    }

    for (auto id :
         MakeInclusiveEnumeratedRange(FontID::MINIMUM, FontID::MAXIMUM)) {
      LookAndFeelFont font{};
      gfxFontStyle fontStyle{};

      bool rv = impl->NativeGetFont(id, font.name(), fontStyle);
      Maybe maybeFont;
      if (rv) {
        font.haveFont() = true;
        font.size() = fontStyle.size;
        font.weight() = fontStyle.weight.ToFloat();
        font.italic() = fontStyle.style.IsItalic();
        MOZ_ASSERT(fontStyle.style.IsNormal() || fontStyle.style.IsItalic(),
                   "Cannot handle oblique font style");
#ifdef DEBUG
        {
          // Assert that all the remaining font style properties have their
          // default values.
          gfxFontStyle candidate = fontStyle;
          gfxFontStyle defaults{};
          candidate.size = defaults.size;
          candidate.weight = defaults.weight;
          candidate.style = defaults.style;
          MOZ_ASSERT(candidate.Equals(defaults),
                     "Some font style properties not supported");
        }
#endif
        maybeFont = Some(std::move(font));
      }
      AddToMap(&lf->tables().fonts(), &lf->tables().fontMap(),
               std::move(maybeFont));
    }

    lf->tables().passwordChar() = impl->GetPasswordCharacterImpl();
    lf->tables().passwordEcho() = impl->GetEchoPasswordImpl();
#ifdef MOZ_WIDGET_GTK
    lf->theme() = aTheme;
#endif
  });

  // This assignment to sCachedLookAndFeelData must be done after the
  // WithThemeConfiguredForContent call, since it can end up calling RefreshImpl
  // on the LookAndFeel, which will clear out sCachedTables.
  sCachedLookAndFeelData = lf;
  return sCachedLookAndFeelData;
}

void RemoteLookAndFeel::ClearCachedData() {
  MOZ_ASSERT(XRE_IsParentProcess());
  sCachedLookAndFeelData = nullptr;
}

StaticAutoPtr RemoteLookAndFeel::sCachedLookAndFeelData;

}  // namespace mozilla::widget