Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 1547 insertions, 0 deletions

diff --git a/widget/nsXPLookAndFeel.cpp b/widget/nsXPLookAndFeel.cpp
new file mode 100644
index 0000000000..05b8952b04
--- /dev/null
+++ b/widget/nsXPLookAndFeel.cpp
@@ -0,0 +1,1547 @@
+/* -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "mozilla/ArrayUtils.h"
+
+#include "mozilla/LookAndFeel.h"
+#include "nscore.h"
+
+#include "nsXPLookAndFeel.h"
+#include "nsLookAndFeel.h"
+#include "HeadlessLookAndFeel.h"
+#include "RemoteLookAndFeel.h"
+#include "nsContentUtils.h"
+#include "nsCRT.h"
+#include "nsFont.h"
+#include "nsIFrame.h"
+#include "nsIXULRuntime.h"
+#include "nsLayoutUtils.h"
+#include "Theme.h"
+#include "SurfaceCacheUtils.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Services.h"
+#include "mozilla/ServoStyleSet.h"
+#include "mozilla/ServoCSSParser.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/StaticPrefs_editor.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_ui.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/PreferenceSheet.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/widget/WidgetMessageUtils.h"
+#include "mozilla/dom/KeyboardEventBinding.h"
+#include "mozilla/RelativeLuminanceUtils.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TelemetryScalarEnums.h"
+#include "mozilla/Try.h"
+
+#include "gfxPlatform.h"
+#include "gfxFont.h"
+
+#include "qcms.h"
+
+#include <bitset>
+
+using namespace mozilla;
+
+using IntID = mozilla::LookAndFeel::IntID;
+using FloatID = mozilla::LookAndFeel::FloatID;
+using ColorID = mozilla::LookAndFeel::ColorID;
+using FontID = mozilla::LookAndFeel::FontID;
+
+template <typename Index, typename Value, Index kEnd>
+class EnumeratedCache {
+  mozilla::EnumeratedArray<Index, kEnd, Value> mEntries;
+  std::bitset<size_t(kEnd)> mValidity;
+
+ public:
+  constexpr EnumeratedCache() = default;
+
+  bool IsValid(Index aIndex) const { return mValidity[size_t(aIndex)]; }
+
+  const Value* Get(Index aIndex) const {
+    return IsValid(aIndex) ? &mEntries[aIndex] : nullptr;
+  }
+
+  void Insert(Index aIndex, Value aValue) {
+    mValidity[size_t(aIndex)] = true;
+    mEntries[aIndex] = aValue;
+  }
+
+  void Remove(Index aIndex) {
+    mValidity[size_t(aIndex)] = false;
+    mEntries[aIndex] = Value();
+  }
+
+  void Clear() {
+    mValidity.reset();
+    for (auto& entry : mEntries) {
+      entry = Value();
+    }
+  }
+};
+
+using ColorCache = EnumeratedCache<ColorID, Maybe<nscolor>, ColorID::End>;
+
+struct ColorCaches {
+  using UseStandins = LookAndFeel::UseStandins;
+
+  ColorCache mCaches[2][2];
+
+  constexpr ColorCaches() = default;
+
+  ColorCache& Get(ColorScheme aScheme, UseStandins aUseStandins) {
+    return mCaches[aScheme == ColorScheme::Dark]
+                  [aUseStandins == UseStandins::Yes];
+  }
+
+  void Clear() {
+    for (auto& c : mCaches) {
+      for (auto& cache : c) {
+        cache.Clear();
+      }
+    }
+  }
+};
+
+static ColorCaches sColorCaches;
+
+static EnumeratedCache<FloatID, Maybe<float>, FloatID::End> sFloatCache;
+static EnumeratedCache<IntID, Maybe<int32_t>, IntID::End> sIntCache;
+static EnumeratedCache<FontID, widget::LookAndFeelFont, FontID::End> sFontCache;
+
+// To make one of these prefs toggleable from a reftest add a user
+// pref in testing/profiles/reftest/user.js. For example, to make
+// ui.useAccessibilityTheme toggleable, add:
+//
+// user_pref("ui.useAccessibilityTheme", 0);
+//
+// This needs to be of the same length and in the same order as
+// LookAndFeel::IntID values.
+static const char sIntPrefs[][45] = {
+    "ui.caretBlinkTime",
+    "ui.caretBlinkCount",
+    "ui.caretWidth",
+    "ui.caretVisibleWithSelection",
+    "ui.selectTextfieldsOnKeyFocus",
+    "ui.submenuDelay",
+    "ui.menusCanOverlapOSBar",
+    "ui.useOverlayScrollbars",
+    "ui.allowOverlayScrollbarsOverlap",
+    "ui.skipNavigatingDisabledMenuItem",
+    "ui.dragThresholdX",
+    "ui.dragThresholdY",
+    "ui.useAccessibilityTheme",
+    "ui.scrollArrowStyle",
+    "ui.scrollButtonLeftMouseButtonAction",
+    "ui.scrollButtonMiddleMouseButtonAction",
+    "ui.scrollButtonRightMouseButtonAction",
+    "ui.treeOpenDelay",
+    "ui.treeCloseDelay",
+    "ui.treeLazyScrollDelay",
+    "ui.treeScrollDelay",
+    "ui.treeScrollLinesMax",
+    "accessibility.tabfocus",  // Weird one...
+    "ui.chosenMenuItemsShouldBlink",
+    "ui.windowsAccentColorInTitlebar",
+    "ui.macBigSurTheme",
+    "ui.macRTL",
+    "ui.alertNotificationOrigin",
+    "ui.scrollToClick",
+    "ui.IMERawInputUnderlineStyle",
+    "ui.IMESelectedRawTextUnderlineStyle",
+    "ui.IMEConvertedTextUnderlineStyle",
+    "ui.IMESelectedConvertedTextUnderlineStyle",
+    "ui.SpellCheckerUnderlineStyle",
+    "ui.menuBarDrag",
+    "ui.scrollbarButtonAutoRepeatBehavior",
+    "ui.tooltipDelay",
+    "ui.swipeAnimationEnabled",
+    "ui.scrollbarDisplayOnMouseMove",
+    "ui.scrollbarFadeBeginDelay",
+    "ui.scrollbarFadeDuration",
+    "ui.contextMenuOffsetVertical",
+    "ui.contextMenuOffsetHorizontal",
+    "ui.GtkCSDAvailable",
+    "ui.GtkCSDMinimizeButton",
+    "ui.GtkCSDMaximizeButton",
+    "ui.GtkCSDCloseButton",
+    "ui.GtkCSDMinimizeButtonPosition",
+    "ui.GtkCSDMaximizeButtonPosition",
+    "ui.GtkCSDCloseButtonPosition",
+    "ui.GtkCSDReversedPlacement",
+    "ui.systemUsesDarkTheme",
+    "ui.prefersReducedMotion",
+    "ui.prefersReducedTransparency",
+    "ui.invertedColors",
+    "ui.primaryPointerCapabilities",
+    "ui.allPointerCapabilities",
+    "ui.systemScrollbarSize",
+    "ui.touchDeviceSupportPresent",
+    "ui.titlebarRadius",
+    "ui.dynamicRange",
+    "ui.videoDynamicRange",
+    "ui.panelAnimations",
+    "ui.hideCursorWhileTyping",
+    "ui.gtkThemeFamily",
+};
+
+static_assert(ArrayLength(sIntPrefs) == size_t(LookAndFeel::IntID::End),
+              "Should have a pref for each int value");
+
+// This array MUST be kept in the same order as the float id list in
+// LookAndFeel.h
+// clang-format off
+static const char sFloatPrefs[][37] = {
+    "ui.IMEUnderlineRelativeSize",
+    "ui.SpellCheckerUnderlineRelativeSize",
+    "ui.caretAspectRatio",
+    "ui.textScaleFactor",
+    "ui.cursorScale",
+};
+// clang-format on
+
+static_assert(ArrayLength(sFloatPrefs) == size_t(LookAndFeel::FloatID::End),
+              "Should have a pref for each float value");
+
+// This array MUST be kept in the same order as the color list in
+// specified/color.rs
+static const char sColorPrefs[][41] = {
+    "ui.activeborder",
+    "ui.activecaption",
+    "ui.appworkspace",
+    "ui.background",
+    "ui.buttonface",
+    "ui.buttonhighlight",
+    "ui.buttonshadow",
+    "ui.buttontext",
+    "ui.buttonborder",
+    "ui.captiontext",
+    "ui.-moz-field",
+    "ui.-moz-disabledfield",
+    "ui.-moz-fieldtext",
+    "ui.mark",
+    "ui.marktext",
+    "ui.-moz-comboboxtext",
+    "ui.-moz-combobox",
+    "ui.graytext",
+    "ui.highlight",
+    "ui.highlighttext",
+    "ui.inactiveborder",
+    "ui.inactivecaption",
+    "ui.inactivecaptiontext",
+    "ui.infobackground",
+    "ui.infotext",
+    "ui.menu",
+    "ui.menutext",
+    "ui.scrollbar",
+    "ui.threeddarkshadow",
+    "ui.threedface",
+    "ui.threedhighlight",
+    "ui.threedlightshadow",
+    "ui.threedshadow",
+    "ui.window",
+    "ui.windowframe",
+    "ui.windowtext",
+    "ui.-moz-default-color",
+    "ui.-moz-default-background-color",
+    "ui.-moz-dialog",
+    "ui.-moz-dialogtext",
+    "ui.-moz-cellhighlight",
+    "ui.-moz_cellhighlighttext",
+    "ui.selecteditem",
+    "ui.selecteditemtext",
+    "ui.-moz-buttonhoverface",
+    "ui.-moz_buttonhovertext",
+    "ui.-moz_menuhover",
+    "ui.-moz_menuhoverdisabled",
+    "ui.-moz_menuhovertext",
+    "ui.-moz_menubarhovertext",
+    "ui.-moz_eventreerow",
+    "ui.-moz_oddtreerow",
+    "ui.-moz-buttonactivetext",
+    "ui.-moz-buttonactiveface",
+    "ui.-moz-buttondisabledface",
+    "ui.-moz-headerbar",
+    "ui.-moz-headerbartext",
+    "ui.-moz-headerbarinactive",
+    "ui.-moz-headerbarinactivetext",
+    "ui.-moz-mac-defaultbuttontext",
+    "ui.-moz-mac-focusring",
+    "ui.-moz_mac_disabledtoolbartext",
+    "ui.-moz-sidebar",
+    "ui.-moz-sidebartext",
+    "ui.-moz-sidebarborder",
+    "ui.accentcolor",
+    "ui.accentcolortext",
+    "ui.-moz-autofill-background",
+    "ui.-moz-nativehyperlinktext",
+    "ui.-moz-nativevisitedhyperlinktext",
+    "ui.-moz-hyperlinktext",
+    "ui.-moz-activehyperlinktext",
+    "ui.-moz-visitedhyperlinktext",
+    "ui.-moz-colheader",
+    "ui.-moz-colheadertext",
+    "ui.-moz-colheaderhover",
+    "ui.-moz-colheaderhovertext",
+    "ui.-moz-colheaderactive",
+    "ui.-moz-colheaderactivetext",
+    "ui.textSelectDisabledBackground",
+    "ui.textSelectAttentionBackground",
+    "ui.textSelectAttentionForeground",
+    "ui.textHighlightBackground",
+    "ui.textHighlightForeground",
+    "ui.IMERawInputBackground",
+    "ui.IMERawInputForeground",
+    "ui.IMERawInputUnderline",
+    "ui.IMESelectedRawTextBackground",
+    "ui.IMESelectedRawTextForeground",
+    "ui.IMESelectedRawTextUnderline",
+    "ui.IMEConvertedTextBackground",
+    "ui.IMEConvertedTextForeground",
+    "ui.IMEConvertedTextUnderline",
+    "ui.IMESelectedConvertedTextBackground",
+    "ui.IMESelectedConvertedTextForeground",
+    "ui.IMESelectedConvertedTextUnderline",
+    "ui.SpellCheckerUnderline",
+    "ui.themedScrollbar",
+    "ui.themedScrollbarInactive",
+    "ui.themedScrollbarThumb",
+    "ui.themedScrollbarThumbHover",
+    "ui.themedScrollbarThumbActive",
+    "ui.themedScrollbarThumbInactive",
+};
+
+static_assert(ArrayLength(sColorPrefs) == size_t(LookAndFeel::ColorID::End),
+              "Should have a pref for each color value");
+
+// This array MUST be kept in the same order as the SystemFont enum.
+static const char sFontPrefs[][41] = {
+    "ui.font.caption",
+    "ui.font.icon",
+    "ui.font.menu",
+    "ui.font.message-box",
+    "ui.font.small-caption",
+    "ui.font.status-bar",
+    "ui.font.-moz-pull-down-menu",
+    "ui.font.-moz-button",
+    "ui.font.-moz-list",
+    "ui.font.-moz-field",
+};
+
+static_assert(ArrayLength(sFontPrefs) == size_t(LookAndFeel::FontID::End),
+              "Should have a pref for each font value");
+
+const char* nsXPLookAndFeel::GetColorPrefName(ColorID aId) {
+  return sColorPrefs[size_t(aId)];
+}
+
+bool nsXPLookAndFeel::sInitialized = false;
+
+nsXPLookAndFeel* nsXPLookAndFeel::sInstance = nullptr;
+bool nsXPLookAndFeel::sShutdown = false;
+
+auto LookAndFeel::SystemZoomSettings() -> ZoomSettings {
+  ZoomSettings settings;
+  switch (StaticPrefs::browser_display_os_zoom_behavior()) {
+    case 0:
+    default:
+      break;
+    case 1:
+      settings.mFullZoom = GetTextScaleFactor();
+      break;
+    case 2:
+      settings.mTextZoom = GetTextScaleFactor();
+      break;
+  }
+  return settings;
+}
+
+// static
+nsXPLookAndFeel* nsXPLookAndFeel::GetInstance() {
+  if (sInstance) {
+    return sInstance;
+  }
+
+  NS_ENSURE_TRUE(!sShutdown, nullptr);
+
+  // If we're in a content process, then the parent process will have supplied
+  // us with an initial FullLookAndFeel object.
+  // We grab this data from the ContentChild,
+  // where it's been temporarily stashed, and initialize our new LookAndFeel
+  // object with it.
+
+  FullLookAndFeel* lnf = nullptr;
+
+  if (auto* cc = mozilla::dom::ContentChild::GetSingleton()) {
+    lnf = &cc->BorrowLookAndFeelData();
+  }
+
+  if (lnf) {
+    sInstance = new widget::RemoteLookAndFeel(std::move(*lnf));
+  } else if (gfxPlatform::IsHeadless()) {
+    sInstance = new widget::HeadlessLookAndFeel();
+  } else {
+    sInstance = new nsLookAndFeel();
+  }
+
+  // This is only ever used once during initialization, and can be cleared now.
+  if (lnf) {
+    *lnf = {};
+  }
+
+  widget::Theme::Init();
+  return sInstance;
+}
+
+// static
+void nsXPLookAndFeel::Shutdown() {
+  if (sShutdown) {
+    return;
+  }
+
+  sShutdown = true;
+  delete sInstance;
+  sInstance = nullptr;
+
+  // This keeps strings alive, so need to clear to make leak checking happy.
+  sFontCache.Clear();
+
+  widget::Theme::Shutdown();
+}
+
+static void IntPrefChanged(const nsACString& aPref) {
+  // Most Int prefs can't change our system colors or fonts, but
+  // ui.systemUsesDarkTheme can, since it affects the effective color-scheme
+  // (affecting system colors).
+  auto changeKind = aPref.EqualsLiteral("ui.systemUsesDarkTheme")
+                        ? widget::ThemeChangeKind::Style
+                        : widget::ThemeChangeKind::MediaQueriesOnly;
+  LookAndFeel::NotifyChangedAllWindows(changeKind);
+}
+
+static void FloatPrefChanged(const nsACString& aPref) {
+  // Most float prefs can't change our system colors or fonts, but
+  // textScaleFactor affects layout.
+  auto changeKind = aPref.EqualsLiteral("ui.textScaleFactor")
+                        ? widget::ThemeChangeKind::StyleAndLayout
+                        : widget::ThemeChangeKind::MediaQueriesOnly;
+  LookAndFeel::NotifyChangedAllWindows(changeKind);
+}
+
+static void ColorPrefChanged() {
+  // Color prefs affect style, because they by definition change system colors.
+  LookAndFeel::NotifyChangedAllWindows(widget::ThemeChangeKind::Style);
+}
+
+static void FontPrefChanged() {
+  // Color prefs affect style, because they by definition change system fonts.
+  LookAndFeel::NotifyChangedAllWindows(widget::ThemeChangeKind::Style);
+}
+
+// static
+void nsXPLookAndFeel::OnPrefChanged(const char* aPref, void* aClosure) {
+  nsDependentCString prefName(aPref);
+  for (const char* pref : sIntPrefs) {
+    if (prefName.Equals(pref)) {
+      IntPrefChanged(prefName);
+      return;
+    }
+  }
+
+  for (const char* pref : sFloatPrefs) {
+    if (prefName.Equals(pref)) {
+      FloatPrefChanged(prefName);
+      return;
+    }
+  }
+
+  for (const char* pref : sColorPrefs) {
+    // We use StringBeginsWith to handle .dark prefs too.
+    if (StringBeginsWith(prefName, nsDependentCString(pref))) {
+      ColorPrefChanged();
+      return;
+    }
+  }
+
+  for (const char* pref : sFontPrefs) {
+    if (StringBeginsWith(prefName, nsDependentCString(pref))) {
+      FontPrefChanged();
+      return;
+    }
+  }
+}
+
+static constexpr struct {
+  nsLiteralCString mName;
+  widget::ThemeChangeKind mChangeKind =
+      widget::ThemeChangeKind::MediaQueriesOnly;
+} kMediaQueryPrefs[] = {
+    // Affects whether standins are used for the accent color.
+    {"widget.non-native-theme.use-theme-accent"_ns,
+     widget::ThemeChangeKind::Style},
+    // These three affect system colors on Windows.
+    {"widget.windows.uwp-system-colors.enabled"_ns,
+     widget::ThemeChangeKind::Style},
+    {"widget.windows.uwp-system-colors.highlight-accent"_ns,
+     widget::ThemeChangeKind::Style},
+    // Affects env().
+    {"layout.css.prefers-color-scheme.content-override"_ns,
+     widget::ThemeChangeKind::Style},
+    // Affects media queries and scrollbar sizes, so gotta relayout.
+    {"widget.gtk.overlay-scrollbars.enabled"_ns,
+     widget::ThemeChangeKind::StyleAndLayout},
+    // Affects zoom settings which includes text and full zoom.
+    {"browser.display.os-zoom-behavior"_ns,
+     widget::ThemeChangeKind::StyleAndLayout},
+    // This affects system colors on Linux.
+    {"widget.gtk.libadwaita-colors.enabled"_ns, widget::ThemeChangeKind::Style},
+    // This affects not only the media query, but also the native theme, so we
+    // need to re-layout.
+    {"browser.theme.toolbar-theme"_ns, widget::ThemeChangeKind::AllBits},
+    {"browser.theme.content-theme"_ns},
+};
+
+// Read values from the user's preferences.
+// This is done once at startup, but since the user's preferences
+// haven't actually been read yet at that time, we also have to
+// set a callback to inform us of changes to each pref.
+void nsXPLookAndFeel::Init() {
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+
+  // Say we're already initialized, and take the chance that it might fail;
+  // protects against some other process writing to our static variables.
+  sInitialized = true;
+
+  if (XRE_IsParentProcess()) {
+    nsLayoutUtils::RecomputeSmoothScrollDefault();
+  }
+
+  // XXX If we could reorganize the pref names, we should separate the branch
+  //     for each types.  Then, we could reduce the unnecessary loop from
+  //     nsXPLookAndFeel::OnPrefChanged().
+  Preferences::RegisterPrefixCallback(OnPrefChanged, "ui.");
+  // We really do just want the accessibility.tabfocus pref, not other prefs
+  // that start with that string.
+  Preferences::RegisterCallback(OnPrefChanged, "accessibility.tabfocus");
+
+  for (const auto& pref : kMediaQueryPrefs) {
+    Preferences::RegisterCallback(
+        [](const char*, void* aChangeKind) {
+          auto changeKind =
+              widget::ThemeChangeKind(reinterpret_cast<uintptr_t>(aChangeKind));
+          LookAndFeel::NotifyChangedAllWindows(changeKind);
+        },
+        pref.mName, reinterpret_cast<void*>(uintptr_t(pref.mChangeKind)));
+  }
+}
+
+nsXPLookAndFeel::~nsXPLookAndFeel() {
+  NS_ASSERTION(sInstance == this,
+               "This destroying instance isn't the singleton instance");
+  sInstance = nullptr;
+}
+
+static bool IsSpecialColor(LookAndFeel::ColorID aID, nscolor aColor) {
+  using ColorID = LookAndFeel::ColorID;
+
+  if (aColor == NS_SAME_AS_FOREGROUND_COLOR) {
+    return true;
+  }
+
+  switch (aID) {
+    case ColorID::IMESelectedRawTextBackground:
+    case ColorID::IMESelectedConvertedTextBackground:
+    case ColorID::IMERawInputBackground:
+    case ColorID::IMEConvertedTextBackground:
+    case ColorID::IMESelectedRawTextForeground:
+    case ColorID::IMESelectedConvertedTextForeground:
+    case ColorID::IMERawInputForeground:
+    case ColorID::IMEConvertedTextForeground:
+    case ColorID::IMERawInputUnderline:
+    case ColorID::IMEConvertedTextUnderline:
+    case ColorID::IMESelectedRawTextUnderline:
+    case ColorID::IMESelectedConvertedTextUnderline:
+    case ColorID::SpellCheckerUnderline:
+      return NS_IS_SELECTION_SPECIAL_COLOR(aColor);
+    default:
+      break;
+  }
+  /*
+   * In GetColor(), every color that is not a special color is color
+   * corrected. Use false to make other colors color corrected.
+   */
+  return false;
+}
+
+nscolor nsXPLookAndFeel::GetStandinForNativeColor(ColorID aID,
+                                                  ColorScheme aScheme) {
+  if (aScheme == ColorScheme::Dark) {
+    if (auto color = GenericDarkColor(aID)) {
+      return *color;
+    }
+  }
+
+  // The stand-in colors are taken from what the non-native theme needs (for
+  // field/button colors), the Windows 7 Aero theme except Mac-specific colors
+  // which are taken from Mac OS 10.7.
+
+#define COLOR(name_, r, g, b) \
+  case ColorID::name_:        \
+    return NS_RGB(r, g, b);
+
+#define COLORA(name_, r, g, b, a) \
+  case ColorID::name_:            \
+    return NS_RGBA(r, g, b, a);
+
+  switch (aID) {
+    // These are here for the purposes of headless mode.
+    case ColorID::IMESelectedRawTextBackground:
+    case ColorID::IMESelectedConvertedTextBackground:
+    case ColorID::IMERawInputBackground:
+    case ColorID::IMEConvertedTextBackground:
+      return NS_TRANSPARENT;
+    case ColorID::IMESelectedRawTextForeground:
+    case ColorID::IMESelectedConvertedTextForeground:
+    case ColorID::IMERawInputForeground:
+    case ColorID::IMEConvertedTextForeground:
+      return NS_SAME_AS_FOREGROUND_COLOR;
+    case ColorID::IMERawInputUnderline:
+    case ColorID::IMEConvertedTextUnderline:
+      return NS_40PERCENT_FOREGROUND_COLOR;
+    case ColorID::Accentcolor:
+      return widget::sDefaultAccent.ToABGR();
+    case ColorID::Accentcolortext:
+      return widget::sDefaultAccentText.ToABGR();
+      COLOR(SpellCheckerUnderline, 0xff, 0x00, 0x00)
+      COLOR(TextSelectDisabledBackground, 0xAA, 0xAA, 0xAA)
+
+      // Titlebar colors
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Activeborder, 0xE3, 0xE3, 0xE3)
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Inactiveborder, 0xE3, 0xE3, 0xE3)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Activecaption, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Inactivecaption, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvastext/Windowtext:
+      COLOR(Captiontext, 0x00, 0x00, 0x00)
+      // deprecated in CSS Color Level 4, same as Graytext:
+      COLOR(Inactivecaptiontext, 0x6D, 0x6D, 0x6D)
+
+      // CSS 2 colors:
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Appworkspace, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Background, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Buttonface:
+      COLOR(Buttonhighlight, 0xE9, 0xE9, 0xED)
+      // deprecated in CSS Color Level 4, same as Buttonface:
+      COLOR(Buttonshadow, 0xE9, 0xE9, 0xED)
+
+      // Buttons and comboboxes should be kept in sync since they are drawn with
+      // the same colors by the non-native theme.
+      COLOR(Buttonface, 0xE9, 0xE9, 0xED)
+      COLORA(MozButtondisabledface, 0xE9, 0xE9, 0xED, 128)
+
+      COLOR(MozCombobox, 0xE9, 0xE9, 0xED)
+
+      COLOR(Buttontext, 0x00, 0x00, 0x00)
+      COLOR(MozComboboxtext, 0x00, 0x00, 0x00)
+
+      COLOR(Graytext, 0x6D, 0x6D, 0x6D)
+      COLOR(Highlight, 0x33, 0x99, 0xFF)
+      COLOR(Highlighttext, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Infobackground, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvastext/Windowtext:
+      COLOR(Infotext, 0x00, 0x00, 0x00)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Menu, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Canvastext/Windowtext:
+      COLOR(Menutext, 0x00, 0x00, 0x00)
+      // deprecated in CSS Color Level 4, same as Canvas/Window:
+      COLOR(Scrollbar, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Threeddarkshadow, 0xE3, 0xE3, 0xE3)
+      // deprecated in CSS Color Level 4, same as Buttonface:
+      COLOR(Threedface, 0xE9, 0xE9, 0xED)
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Threedhighlight, 0xE3, 0xE3, 0xE3)
+      COLOR(Threedlightshadow, 0xE3, 0xE3, 0xE3)
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Threedshadow, 0xE3, 0xE3, 0xE3)
+      COLOR(Buttonborder, 0xE3, 0xE3, 0xE3)
+      COLOR(Mark, 0xFF, 0xFF, 0x00)
+      COLOR(Marktext, 0x00, 0x00, 0x00)
+      COLOR(Window, 0xFF, 0xFF, 0xFF)
+      // deprecated in CSS Color Level 4, same as Buttonborder:
+      COLOR(Windowframe, 0xE3, 0xE3, 0xE3)
+      COLOR(Windowtext, 0x00, 0x00, 0x00)
+      COLOR(Field, 0xFF, 0xFF, 0xFF)
+      COLORA(MozDisabledfield, 0xFF, 0xFF, 0xFF, 128)
+      COLOR(Fieldtext, 0x00, 0x00, 0x00)
+      COLOR(MozDialog, 0xF0, 0xF0, 0xF0)
+      COLOR(MozDialogtext, 0x00, 0x00, 0x00)
+      COLOR(MozColheadertext, 0x00, 0x00, 0x00)
+      COLOR(MozColheaderhovertext, 0x00, 0x00, 0x00)
+      COLOR(MozCellhighlight, 0xF0, 0xF0, 0xF0)
+      COLOR(MozCellhighlighttext, 0x00, 0x00, 0x00)
+      COLOR(Selecteditem, 0x33, 0x99, 0xFF)
+      COLOR(Selecteditemtext, 0xFF, 0xFF, 0xFF)
+      COLOR(MozButtonhoverface, 0xd0, 0xd0, 0xd7)
+      COLOR(MozButtonhovertext, 0x00, 0x00, 0x00)
+      COLOR(MozButtonactiveface, 0xb1, 0xb1, 0xb9)
+      COLOR(MozButtonactivetext, 0x00, 0x00, 0x00)
+      COLOR(MozMenuhover, 0x33, 0x99, 0xFF)
+      COLOR(MozMenuhovertext, 0x00, 0x00, 0x00)
+      COLOR(MozMenubarhovertext, 0x00, 0x00, 0x00)
+      COLOR(MozMenuhoverdisabled, 0xF0, 0xF0, 0xF0)
+      COLOR(MozEventreerow, 0xFF, 0xFF, 0xFF)
+      COLOR(MozOddtreerow, 0xFF, 0xFF, 0xFF)
+      COLOR(MozMacFocusring, 0x60, 0x9D, 0xD7)
+      COLOR(MozMacDisabledtoolbartext, 0x3F, 0x3F, 0x3F)
+      // Seems to be the default color (hardcoded because of bug 1065998)
+      COLOR(MozNativehyperlinktext, 0x00, 0x66, 0xCC)
+      COLOR(MozNativevisitedhyperlinktext, 0x55, 0x1A, 0x8B)
+    default:
+      break;
+  }
+  return NS_RGB(0xFF, 0xFF, 0xFF);
+}
+
+#undef COLOR
+#undef COLORA
+
+// Taken from in-content/common.inc.css's dark theme.
+Maybe<nscolor> nsXPLookAndFeel::GenericDarkColor(ColorID aID) {
+  nscolor color = NS_RGB(0, 0, 0);
+  static constexpr nscolor kWindowBackground = NS_RGB(28, 27, 34);
+  static constexpr nscolor kWindowText = NS_RGB(251, 251, 254);
+  switch (aID) {
+    case ColorID::Window:  // --in-content-page-background
+    case ColorID::Background:
+    case ColorID::Appworkspace:
+    case ColorID::Scrollbar:
+    case ColorID::Infobackground:
+      color = kWindowBackground;
+      break;
+
+    case ColorID::Menu:
+      color = NS_RGB(0x2b, 0x2a, 0x33);
+      break;
+
+    case ColorID::MozMenuhovertext:
+    case ColorID::MozMenubarhovertext:
+    case ColorID::Menutext:
+      color = NS_RGB(0xfb, 0xfb, 0xfe);
+      break;
+
+    case ColorID::MozMenuhover:
+      color = NS_RGB(0x52, 0x52, 0x5e);
+      break;
+
+    case ColorID::MozMenuhoverdisabled:
+      color = NS_RGB(0x3a, 0x39, 0x44);
+      break;
+
+    case ColorID::MozEventreerow:
+    case ColorID::MozOddtreerow:
+    case ColorID::MozDialog:  // --in-content-box-background
+      color = NS_RGB(35, 34, 43);
+      break;
+    case ColorID::Windowtext:  // --in-content-page-color
+    case ColorID::MozDialogtext:
+    case ColorID::MozSidebartext:
+    case ColorID::Fieldtext:
+    case ColorID::Infotext:
+    case ColorID::Buttontext:  // --in-content-button-text-color (via
+                               // --in-content-page-color)
+    case ColorID::MozComboboxtext:
+    case ColorID::MozButtonhovertext:
+    case ColorID::MozButtonactivetext:
+    case ColorID::MozHeaderbartext:
+    case ColorID::MozHeaderbarinactivetext:
+    case ColorID::Captiontext:
+    case ColorID::Inactivecaptiontext:  // TODO(emilio): Maybe make
+                                        // Inactivecaptiontext Graytext?
+    case ColorID::MozColheadertext:
+    case ColorID::MozColheaderhovertext:
+    case ColorID::MozColheaderactivetext:
+      color = kWindowText;
+      break;
+    case ColorID::Buttonshadow:
+    case ColorID::Threedshadow:
+    case ColorID::MozSidebarborder:
+    case ColorID::Threedlightshadow:
+    case ColorID::Threedhighlight:
+    case ColorID::Windowframe:
+    case ColorID::Buttonborder:  // --in-content-box-border-color computed
+                                 // with kWindowText above
+                                 // kWindowBackground.
+    case ColorID::Graytext:      // opacity: 0.4 of kWindowText blended over the
+                             // "Window" background color, which happens to be
+                             // the same :-)
+      color = NS_ComposeColors(kWindowBackground, NS_RGBA(251, 251, 254, 102));
+      break;
+    case ColorID::MozCellhighlight:
+    case ColorID::Selecteditem:  // --in-content-primary-button-background /
+                                 // --in-content-item-selected
+      color = NS_RGB(0, 221, 255);
+      break;
+    case ColorID::MozSidebar:
+    case ColorID::Field:
+    case ColorID::Buttonface:  // --in-content-button-background
+    case ColorID::Buttonhighlight:
+    case ColorID::MozColheader:
+    case ColorID::Threedface:
+    case ColorID::MozCombobox:
+    case ColorID::MozCellhighlighttext:
+    case ColorID::Selecteditemtext:  // --in-content-primary-button-text-color /
+                                     // --in-content-item-selected-text
+      color = NS_RGB(43, 42, 51);
+      break;
+    case ColorID::Threeddarkshadow:  // Same as Threedlightshadow but with the
+                                     // background.
+    case ColorID::MozDisabledfield:  // opacity: 0.4 of the face above blended
+                                     // over the "Window" background color.
+    case ColorID::MozButtondisabledface:
+      color = NS_ComposeColors(kWindowBackground, NS_RGBA(43, 42, 51, 102));
+      break;
+    case ColorID::MozButtonhoverface:  // --in-content-button-background-hover
+    case ColorID::MozColheaderhover:
+      color = NS_RGB(82, 82, 94);
+      break;
+    case ColorID::MozButtonactiveface:  // --in-content-button-background-active
+    case ColorID::MozColheaderactive:
+      color = NS_RGB(91, 91, 102);
+      break;
+    case ColorID::Highlight:
+      color = NS_RGBA(0, 221, 255, 78);
+      break;
+    case ColorID::Highlighttext:
+      color = NS_SAME_AS_FOREGROUND_COLOR;
+      break;
+    case ColorID::MozNativehyperlinktext:
+      // If you change this color, you probably also want to change the default
+      // value of browser.anchor_color.dark.
+      color = NS_RGB(0x8c, 0x8c, 0xff);
+      break;
+    case ColorID::MozNativevisitedhyperlinktext:
+      // If you change this color, you probably also want to change the default
+      // value of browser.visited_color.dark.
+      color = NS_RGB(0xff, 0xad, 0xff);
+      break;
+    case ColorID::SpellCheckerUnderline:
+      // This is the default for active links in dark mode as well
+      // (browser.active_color.dark). See bug 1755564 for some analysis and
+      // other options too.
+      color = NS_RGB(0xff, 0x66, 0x66);
+      break;
+    case ColorID::Activeborder:
+    case ColorID::Inactiveborder:
+      color = NS_RGB(57, 57, 57);
+      break;
+    case ColorID::MozHeaderbar:
+    case ColorID::MozHeaderbarinactive:
+    case ColorID::Activecaption:
+    case ColorID::Inactivecaption:
+      color = NS_RGB(28, 27, 34);
+      break;
+    default:
+      return Nothing();
+  }
+  return Some(color);
+}
+
+// Uncomment the #define below if you want to debug system color use in a skin
+// that uses them.  When set, it will make all system color pairs that are
+// appropriate for foreground/background pairing the same.  This means if the
+// skin is using system colors correctly you will not be able to see *any* text.
+//
+// #define DEBUG_SYSTEM_COLOR_USE
+
+#ifdef DEBUG_SYSTEM_COLOR_USE
+static nsresult SystemColorUseDebuggingColor(LookAndFeel::ColorID aID,
+                                             nscolor& aResult) {
+  using ColorID = LookAndFeel::ColorID;
+
+  switch (aID) {
+      // css2  http://www.w3.org/TR/REC-CSS2/ui.html#system-colors
+    case ColorID::Activecaption:
+      // active window caption background
+    case ColorID::Captiontext:
+      // text in active window caption
+      aResult = NS_RGB(0xff, 0x00, 0x00);
+      break;
+
+    case ColorID::Highlight:
+      // background of selected item
+    case ColorID::Highlighttext:
+      // text of selected item
+      aResult = NS_RGB(0xff, 0xff, 0x00);
+      break;
+
+    case ColorID::Inactivecaption:
+      // inactive window caption
+    case ColorID::Inactivecaptiontext:
+      // text in inactive window caption
+      aResult = NS_RGB(0x66, 0x66, 0x00);
+      break;
+
+    case ColorID::Infobackground:
+      // tooltip background color
+    case ColorID::Infotext:
+      // tooltip text color
+      aResult = NS_RGB(0x00, 0xff, 0x00);
+      break;
+
+    case ColorID::Menu:
+      // menu background
+    case ColorID::Menutext:
+      // menu text
+      aResult = NS_RGB(0x00, 0xff, 0xff);
+      break;
+
+    case ColorID::Threedface:
+    case ColorID::Buttonface:
+      // 3-D face color
+    case ColorID::Buttontext:
+      // text on push buttons
+      aResult = NS_RGB(0x00, 0x66, 0x66);
+      break;
+
+    case ColorID::Window:
+    case ColorID::Windowtext:
+      aResult = NS_RGB(0x00, 0x00, 0xff);
+      break;
+
+      // from the CSS3 working draft (not yet finalized)
+      // http://www.w3.org/tr/2000/wd-css3-userint-20000216.html#color
+
+    case ColorID::Field:
+    case ColorID::Fieldtext:
+      aResult = NS_RGB(0xff, 0x00, 0xff);
+      break;
+
+    case ColorID::MozDialog:
+    case ColorID::MozDialogtext:
+      aResult = NS_RGB(0x66, 0x00, 0x66);
+      break;
+
+    default:
+      return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  return NS_OK;
+}
+#endif
+
+static nsresult GetPrefColor(const char* aPref, nscolor& aResult) {
+  nsAutoCString colorStr;
+  MOZ_TRY(Preferences::GetCString(aPref, colorStr));
+  if (!ServoCSSParser::ComputeColor(nullptr, NS_RGB(0, 0, 0), colorStr,
+                                    &aResult)) {
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+static nsresult GetColorFromPref(LookAndFeel::ColorID aID, ColorScheme aScheme,
+                                 nscolor& aResult) {
+  const char* prefName = sColorPrefs[size_t(aID)];
+  if (aScheme == ColorScheme::Dark) {
+    nsAutoCString darkPrefName(prefName);
+    darkPrefName.Append(".dark");
+    if (NS_SUCCEEDED(GetPrefColor(darkPrefName.get(), aResult))) {
+      return NS_OK;
+    }
+  }
+  return GetPrefColor(prefName, aResult);
+}
+
+// All these routines will return NS_OK if they have a value,
+// in which case the nsLookAndFeel should use that value;
+// otherwise we'll return NS_ERROR_NOT_AVAILABLE, in which case, the
+// platform-specific nsLookAndFeel should use its own values instead.
+nsresult nsXPLookAndFeel::GetColorValue(ColorID aID, ColorScheme aScheme,
+                                        UseStandins aUseStandins,
+                                        nscolor& aResult) {
+  if (!sInitialized) {
+    Init();
+  }
+
+#ifdef DEBUG_SYSTEM_COLOR_USE
+  if (NS_SUCCEEDED(SystemColorUseDebuggingColor(aID, aResult))) {
+    return NS_OK;
+  }
+#endif
+
+  auto& cache = sColorCaches.Get(aScheme, aUseStandins);
+  if (const auto* cached = cache.Get(aID)) {
+    if (cached->isNothing()) {
+      return NS_ERROR_FAILURE;
+    }
+    aResult = cached->value();
+    return NS_OK;
+  }
+
+  // NOTE: Servo holds a lock and the main thread is paused, so writing to the
+  // global cache here is fine.
+  auto result = GetUncachedColor(aID, aScheme, aUseStandins);
+  cache.Insert(aID, result);
+  if (!result) {
+    return NS_ERROR_FAILURE;
+  }
+  aResult = *result;
+  return NS_OK;
+}
+
+Maybe<nscolor> nsXPLookAndFeel::GetUncachedColor(ColorID aID,
+                                                 ColorScheme aScheme,
+                                                 UseStandins aUseStandins) {
+  if (aUseStandins == UseStandins::Yes) {
+    return Some(GetStandinForNativeColor(aID, aScheme));
+  }
+  nscolor r;
+  if (NS_SUCCEEDED(GetColorFromPref(aID, aScheme, r))) {
+    return Some(r);
+  }
+  if (NS_SUCCEEDED(NativeGetColor(aID, aScheme, r))) {
+    if (gfxPlatform::GetCMSMode() == CMSMode::All && !IsSpecialColor(aID, r)) {
+      qcms_transform* transform = gfxPlatform::GetCMSInverseRGBTransform();
+      if (transform) {
+        uint8_t color[4];
+        color[0] = NS_GET_R(r);
+        color[1] = NS_GET_G(r);
+        color[2] = NS_GET_B(r);
+        color[3] = NS_GET_A(r);
+        qcms_transform_data(transform, color, color, 1);
+        r = NS_RGBA(color[0], color[1], color[2], color[3]);
+      }
+    }
+
+    return Some(r);
+  }
+  return Nothing();
+}
+
+nsresult nsXPLookAndFeel::GetIntValue(IntID aID, int32_t& aResult) {
+  if (!sInitialized) {
+    Init();
+  }
+
+  if (const auto* cached = sIntCache.Get(aID)) {
+    if (cached->isNothing()) {
+      return NS_ERROR_FAILURE;
+    }
+    aResult = cached->value();
+    return NS_OK;
+  }
+
+  if (NS_SUCCEEDED(Preferences::GetInt(sIntPrefs[size_t(aID)], &aResult))) {
+    sIntCache.Insert(aID, Some(aResult));
+    return NS_OK;
+  }
+
+  if (NS_FAILED(NativeGetInt(aID, aResult))) {
+    sIntCache.Insert(aID, Nothing());
+    return NS_ERROR_FAILURE;
+  }
+
+  sIntCache.Insert(aID, Some(aResult));
+  return NS_OK;
+}
+
+nsresult nsXPLookAndFeel::GetFloatValue(FloatID aID, float& aResult) {
+  if (!sInitialized) {
+    Init();
+  }
+
+  if (const auto* cached = sFloatCache.Get(aID)) {
+    if (cached->isNothing()) {
+      return NS_ERROR_FAILURE;
+    }
+    aResult = cached->value();
+    return NS_OK;
+  }
+
+  int32_t pref = 0;
+  if (NS_SUCCEEDED(Preferences::GetInt(sFloatPrefs[size_t(aID)], &pref))) {
+    aResult = float(pref) / 100.0f;
+    sFloatCache.Insert(aID, Some(aResult));
+    return NS_OK;
+  }
+
+  if (NS_FAILED(NativeGetFloat(aID, aResult))) {
+    sFloatCache.Insert(aID, Nothing());
+    return NS_ERROR_FAILURE;
+  }
+
+  sFloatCache.Insert(aID, Some(aResult));
+  return NS_OK;
+}
+
+bool nsXPLookAndFeel::LookAndFeelFontToStyle(const LookAndFeelFont& aFont,
+                                             nsString& aName,
+                                             gfxFontStyle& aStyle) {
+  if (!aFont.haveFont()) {
+    return false;
+  }
+  aName = aFont.name();
+  aStyle = gfxFontStyle();
+  aStyle.size = aFont.size();
+  aStyle.weight = FontWeight::FromInt(aFont.weight());
+  aStyle.style =
+      aFont.italic() ? FontSlantStyle::ITALIC : FontSlantStyle::NORMAL;
+  aStyle.systemFont = true;
+  return true;
+}
+
+widget::LookAndFeelFont nsXPLookAndFeel::StyleToLookAndFeelFont(
+    const nsAString& aName, const gfxFontStyle& aStyle) {
+  LookAndFeelFont font;
+  font.haveFont() = true;
+  font.name() = aName;
+  font.size() = aStyle.size;
+  font.weight() = aStyle.weight.ToFloat();
+  font.italic() = aStyle.style.IsItalic();
+  MOZ_ASSERT(aStyle.style.IsNormal() || aStyle.style.IsItalic(),
+             "Cannot handle oblique font style");
+#ifdef DEBUG
+  {
+    // Assert that all the remaining font style properties have their
+    // default values.
+    gfxFontStyle candidate = aStyle;
+    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
+  return font;
+}
+
+bool nsXPLookAndFeel::GetFontValue(FontID aID, nsString& aName,
+                                   gfxFontStyle& aStyle) {
+  if (const LookAndFeelFont* cached = sFontCache.Get(aID)) {
+    return LookAndFeelFontToStyle(*cached, aName, aStyle);
+  }
+
+  LookAndFeelFont font;
+  auto GetFontsFromPrefs = [&]() -> bool {
+    nsDependentCString pref(sFontPrefs[size_t(aID)]);
+    if (NS_FAILED(Preferences::GetString(pref.get(), aName))) {
+      return false;
+    }
+    font.haveFont() = true;
+    font.name() = aName;
+    font.size() = Preferences::GetFloat(nsAutoCString(pref + ".size"_ns).get());
+    // This is written this way rather than using the fallback so that an empty
+    // pref (such like the one about:config creates) doesn't cause system fonts
+    // to have zero-size.
+    if (font.size() < 1.0f) {
+      font.size() = StyleFONT_MEDIUM_PX;
+    }
+    font.weight() = Preferences::GetFloat(
+        nsAutoCString(pref + ".weight"_ns).get(), FontWeight::NORMAL.ToFloat());
+    font.italic() =
+        Preferences::GetBool(nsAutoCString(pref + ".italic"_ns).get());
+    return true;
+  };
+
+  if (GetFontsFromPrefs()) {
+    LookAndFeelFontToStyle(font, aName, aStyle);
+  } else if (NativeGetFont(aID, aName, aStyle)) {
+    font = StyleToLookAndFeelFont(aName, aStyle);
+  } else {
+    MOZ_ASSERT(!font.haveFont());
+  }
+  bool success = font.haveFont();
+  sFontCache.Insert(aID, std::move(font));
+  return success;
+}
+
+void nsXPLookAndFeel::RefreshImpl() {
+  // Wipe out our caches.
+  sColorCaches.Clear();
+  sFontCache.Clear();
+  sFloatCache.Clear();
+  sIntCache.Clear();
+
+  if (XRE_IsParentProcess()) {
+    nsLayoutUtils::RecomputeSmoothScrollDefault();
+    // Clear any cached FullLookAndFeel data, which is now invalid.
+    widget::RemoteLookAndFeel::ClearCachedData();
+  }
+}
+
+static bool sRecordedLookAndFeelTelemetry = false;
+
+void nsXPLookAndFeel::RecordTelemetry() {
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  if (sRecordedLookAndFeelTelemetry) {
+    return;
+  }
+
+  sRecordedLookAndFeelTelemetry = true;
+
+  int32_t i;
+  Telemetry::ScalarSet(
+      Telemetry::ScalarID::WIDGET_DARK_MODE,
+      NS_SUCCEEDED(GetIntValue(IntID::SystemUsesDarkTheme, i)) && i != 0);
+
+  RecordLookAndFeelSpecificTelemetry();
+}
+
+namespace mozilla {
+
+bool LookAndFeel::sGlobalThemeChanged;
+static widget::ThemeChangeKind sGlobalThemeChangeKind{0};
+
+void LookAndFeel::NotifyChangedAllWindows(widget::ThemeChangeKind aKind) {
+  sGlobalThemeChanged = true;
+  sGlobalThemeChangeKind |= aKind;
+
+  if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
+    const char16_t kind[] = {char16_t(aKind), 0};
+    obs->NotifyObservers(nullptr, "internal-look-and-feel-changed", kind);
+  }
+}
+
+void LookAndFeel::DoHandleGlobalThemeChange() {
+  MOZ_ASSERT(sGlobalThemeChanged);
+  sGlobalThemeChanged = false;
+  auto kind = std::exchange(sGlobalThemeChangeKind, widget::ThemeChangeKind(0));
+
+  // Tell the theme that it changed, so it can flush any handles to stale theme
+  // data.
+  //
+  // We can use the *DoNotUseDirectly functions directly here, because we want
+  // to notify all possible themes in a given process (but just once).
+  if (XRE_IsParentProcess() ||
+      !StaticPrefs::widget_non_native_theme_enabled()) {
+    if (nsCOMPtr<nsITheme> theme = do_GetNativeThemeDoNotUseDirectly()) {
+      theme->ThemeChanged();
+    }
+  }
+  if (nsCOMPtr<nsITheme> theme = do_GetBasicNativeThemeDoNotUseDirectly()) {
+    theme->ThemeChanged();
+  }
+
+  // Clear all cached LookAndFeel colors.
+  LookAndFeel::Refresh();
+
+  // Reset default background and foreground colors for the document since they
+  // may be using system colors, color scheme, etc.
+  PreferenceSheet::Refresh();
+
+  // Vector images (SVG) may be using theme colors so we discard all cached
+  // surfaces. (We could add a vector image only version of DiscardAll, but
+  // in bug 940625 we decided theme changes are rare enough not to bother.)
+  image::SurfaceCacheUtils::DiscardAll();
+
+  if (XRE_IsParentProcess()) {
+    dom::ContentParent::BroadcastThemeUpdate(kind);
+  }
+
+  nsContentUtils::AddScriptRunner(
+      NS_NewRunnableFunction("HandleGlobalThemeChange", [] {
+        if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
+          obs->NotifyObservers(nullptr, "look-and-feel-changed", nullptr);
+        }
+      }));
+}
+
+#define BIT_FOR(_c) (1ull << size_t(ColorID::_c))
+
+// We want to use a non-native color scheme for the non-native theme (except in
+// high-contrast mode), so spoof some of the colors with stand-ins to prevent
+// lack of contrast.
+static constexpr std::bitset<size_t(ColorID::End)> sNonNativeThemeStandinColors{
+    // Used by default button styles.
+    BIT_FOR(Buttonface) | BIT_FOR(Buttontext) | BIT_FOR(MozButtonhoverface) |
+    BIT_FOR(MozButtonhovertext) | BIT_FOR(MozButtonactiveface) |
+    BIT_FOR(MozButtonactivetext) | BIT_FOR(MozButtondisabledface) |
+    BIT_FOR(Buttonborder) |
+    // Used by select elements.
+    BIT_FOR(MozCombobox) | BIT_FOR(MozComboboxtext) |
+    BIT_FOR(Threedlightshadow) |
+    // For symmetry with the above.
+    BIT_FOR(Threeddarkshadow) |
+    // Used by fieldset borders.
+    BIT_FOR(Threedface) |
+    // Used by input / textarea.
+    BIT_FOR(Field) | BIT_FOR(Fieldtext) |
+    // Used by disabled form controls.
+    BIT_FOR(MozDisabledfield) | BIT_FOR(Graytext) |
+    // Per spec, the following colors are deprecated, see
+    // https://drafts.csswg.org/css-color-4/#deprecated-system-colors
+    // should match ButtonFace:
+    BIT_FOR(Buttonhighlight) | BIT_FOR(Buttonshadow) | BIT_FOR(Threedface) |
+    // should match ButtonBorder:
+    BIT_FOR(Activeborder) | BIT_FOR(Inactiveborder) |
+    BIT_FOR(Threeddarkshadow) | BIT_FOR(Threedhighlight) |
+    BIT_FOR(Threedshadow) | BIT_FOR(Windowframe) |
+    // should match GrayText:
+    BIT_FOR(Inactivecaptiontext) |
+    // should match Canvas/Window:
+    BIT_FOR(Appworkspace) | BIT_FOR(Background) | BIT_FOR(Inactivecaption) |
+    BIT_FOR(Infobackground) | BIT_FOR(Menu) | BIT_FOR(Scrollbar) |
+    // should match CanvasText/WindowText:
+    BIT_FOR(Activecaption) | BIT_FOR(Captiontext) | BIT_FOR(Infotext) |
+    BIT_FOR(Menutext) |
+    // Some pages expect these to return windows-like colors, see bug 1773795.
+    // Also, per spec, these should match Canvas/CanvasText, see
+    // https://drafts.csswg.org/css-color-4/#valdef-color-window and
+    // https://drafts.csswg.org/css-color-4/#valdef-color-windowtext
+    BIT_FOR(Window) | BIT_FOR(Windowtext)};
+#undef BIT_FOR
+
+static bool ShouldUseStandinsForNativeColorForNonNativeTheme(
+    const dom::Document& aDoc, LookAndFeel::ColorID aColor,
+    const PreferenceSheet::Prefs& aPrefs) {
+  const bool shouldUseStandinsForColor = [&] {
+    if (sNonNativeThemeStandinColors[size_t(aColor)]) {
+      return true;
+    }
+    // There are platforms where we want the content-exposed accent color to be
+    // the windows blue rather than the system accent color, for now.
+    return !StaticPrefs::widget_non_native_theme_use_theme_accent() &&
+           (aColor == LookAndFeel::ColorID::Accentcolor ||
+            aColor == LookAndFeel::ColorID::Accentcolortext);
+  }();
+
+  return shouldUseStandinsForColor && aDoc.ShouldAvoidNativeTheme() &&
+         !aPrefs.NonNativeThemeShouldBeHighContrast();
+}
+
+bool LookAndFeel::IsDarkColor(nscolor aColor) {
+  // Given https://www.w3.org/TR/WCAG20/#contrast-ratiodef, this is the
+  // threshold that tells us whether contrast is better against white or black.
+  //
+  // Contrast ratio against black is: (L + 0.05) / 0.05
+  // Contrast ratio against white is: 1.05 / (L + 0.05)
+  //
+  // So the intersection is:
+  //
+  //   (L + 0.05) / 0.05 = 1.05 / (L + 0.05)
+  //
+  // And the solution to that equation is:
+  //
+  //   sqrt(1.05 * 0.05) - 0.05
+  //
+  // So we consider a color dark if the contrast is below this threshold, and
+  // it's at least half-opaque.
+  constexpr float kThreshold = 0.179129;
+  return NS_GET_A(aColor) > 127 &&
+         RelativeLuminanceUtils::Compute(aColor) < kThreshold;
+}
+
+ColorScheme LookAndFeel::ColorSchemeForStyle(
+    const dom::Document& aDoc, const StyleColorSchemeFlags& aFlags,
+    ColorSchemeMode aMode) {
+  const auto& prefs = PreferenceSheet::PrefsFor(aDoc);
+  StyleColorSchemeFlags style(aFlags);
+  if (!style) {
+    style._0 = aDoc.GetColorSchemeBits();
+  }
+  const bool supportsDark = bool(style & StyleColorSchemeFlags::DARK);
+  const bool supportsLight = bool(style & StyleColorSchemeFlags::LIGHT);
+  if (supportsLight && supportsDark) {
+    // Both color-schemes are explicitly supported, use the preferred one.
+    return aDoc.PreferredColorScheme();
+  }
+  if (supportsDark || supportsLight) {
+    // One color-scheme is explicitly supported and one isn't, so use the one
+    // the content supports.
+    return supportsDark ? ColorScheme::Dark : ColorScheme::Light;
+  }
+  // No value specified. Chrome docs, and forced-colors mode always supports
+  // both, so use the preferred color-scheme.
+  if (aMode == ColorSchemeMode::Preferred || aDoc.ChromeRulesEnabled() ||
+      !prefs.mUseDocumentColors) {
+    return aDoc.PreferredColorScheme();
+  }
+  // Otherwise default content to light.
+  return ColorScheme::Light;
+}
+
+LookAndFeel::ColorScheme LookAndFeel::ColorSchemeForFrame(
+    const nsIFrame* aFrame, ColorSchemeMode aMode) {
+  return ColorSchemeForStyle(*aFrame->PresContext()->Document(),
+                             aFrame->StyleUI()->mColorScheme.bits, aMode);
+}
+
+// static
+Maybe<nscolor> LookAndFeel::GetColor(ColorID aId, ColorScheme aScheme,
+                                     UseStandins aUseStandins) {
+  nscolor result;
+  nsresult rv = nsLookAndFeel::GetInstance()->GetColorValue(
+      aId, aScheme, aUseStandins, result);
+  if (NS_FAILED(rv)) {
+    return Nothing();
+  }
+  return Some(result);
+}
+
+// Returns whether there is a CSS color name for this color.
+static bool ColorIsCSSAccessible(LookAndFeel::ColorID aId) {
+  using ColorID = LookAndFeel::ColorID;
+
+  switch (aId) {
+    case ColorID::TextSelectDisabledBackground:
+    case ColorID::TextSelectAttentionBackground:
+    case ColorID::TextSelectAttentionForeground:
+    case ColorID::TextHighlightBackground:
+    case ColorID::TextHighlightForeground:
+    case ColorID::ThemedScrollbar:
+    case ColorID::ThemedScrollbarInactive:
+    case ColorID::ThemedScrollbarThumb:
+    case ColorID::ThemedScrollbarThumbActive:
+    case ColorID::ThemedScrollbarThumbInactive:
+    case ColorID::ThemedScrollbarThumbHover:
+    case ColorID::IMERawInputBackground:
+    case ColorID::IMERawInputForeground:
+    case ColorID::IMERawInputUnderline:
+    case ColorID::IMESelectedRawTextBackground:
+    case ColorID::IMESelectedRawTextForeground:
+    case ColorID::IMESelectedRawTextUnderline:
+    case ColorID::IMEConvertedTextBackground:
+    case ColorID::IMEConvertedTextForeground:
+    case ColorID::IMEConvertedTextUnderline:
+    case ColorID::IMESelectedConvertedTextBackground:
+    case ColorID::IMESelectedConvertedTextForeground:
+    case ColorID::IMESelectedConvertedTextUnderline:
+    case ColorID::SpellCheckerUnderline:
+      return false;
+    default:
+      break;
+  }
+
+  return true;
+}
+
+LookAndFeel::UseStandins LookAndFeel::ShouldUseStandins(
+    const dom::Document& aDoc, ColorID aId) {
+  const auto& prefs = PreferenceSheet::PrefsFor(aDoc);
+  if (ShouldUseStandinsForNativeColorForNonNativeTheme(aDoc, aId, prefs)) {
+    return UseStandins::Yes;
+  }
+  if (prefs.mUseStandins && ColorIsCSSAccessible(aId)) {
+    return UseStandins::Yes;
+  }
+  return UseStandins::No;
+}
+
+Maybe<nscolor> LookAndFeel::GetColor(ColorID aId, const nsIFrame* aFrame) {
+  const auto* doc = aFrame->PresContext()->Document();
+  return GetColor(aId, ColorSchemeForFrame(aFrame),
+                  ShouldUseStandins(*doc, aId));
+}
+
+// static
+nsresult LookAndFeel::GetInt(IntID aID, int32_t* aResult) {
+  return nsLookAndFeel::GetInstance()->GetIntValue(aID, *aResult);
+}
+
+// static
+nsresult LookAndFeel::GetFloat(FloatID aID, float* aResult) {
+  return nsLookAndFeel::GetInstance()->GetFloatValue(aID, *aResult);
+}
+
+// static
+bool LookAndFeel::GetFont(FontID aID, nsString& aName, gfxFontStyle& aStyle) {
+  return nsLookAndFeel::GetInstance()->GetFontValue(aID, aName, aStyle);
+}
+
+// static
+char16_t LookAndFeel::GetPasswordCharacter() {
+  return nsLookAndFeel::GetInstance()->GetPasswordCharacterImpl();
+}
+
+// static
+bool LookAndFeel::GetEchoPassword() {
+  if (StaticPrefs::editor_password_mask_delay() >= 0) {
+    return StaticPrefs::editor_password_mask_delay() > 0;
+  }
+  return nsLookAndFeel::GetInstance()->GetEchoPasswordImpl();
+}
+
+// static
+uint32_t LookAndFeel::GetPasswordMaskDelay() {
+  int32_t delay = StaticPrefs::editor_password_mask_delay();
+  if (delay < 0) {
+    return nsLookAndFeel::GetInstance()->GetPasswordMaskDelayImpl();
+  }
+  return delay;
+}
+
+bool LookAndFeel::DrawInTitlebar() {
+  switch (StaticPrefs::browser_tabs_inTitlebar()) {
+    case 0:
+      return false;
+    case 1:
+      return true;
+    default:
+      break;
+  }
+  return nsLookAndFeel::GetInstance()->GetDefaultDrawInTitlebar();
+}
+
+LookAndFeel::TitlebarAction LookAndFeel::GetTitlebarAction(
+    TitlebarEvent aEvent) {
+  return nsLookAndFeel::GetInstance()->GetTitlebarAction(aEvent);
+}
+
+void LookAndFeel::GetThemeInfo(nsACString& aOut) {
+  nsLookAndFeel::GetInstance()->GetThemeInfo(aOut);
+}
+
+uint32_t LookAndFeel::GetMenuAccessKey() {
+  return StaticPrefs::ui_key_menuAccessKey();
+}
+
+Modifiers LookAndFeel::GetMenuAccessKeyModifiers() {
+  switch (GetMenuAccessKey()) {
+    case dom::KeyboardEvent_Binding::DOM_VK_SHIFT:
+      return MODIFIER_SHIFT;
+    case dom::KeyboardEvent_Binding::DOM_VK_CONTROL:
+      return MODIFIER_CONTROL;
+    case dom::KeyboardEvent_Binding::DOM_VK_ALT:
+      return MODIFIER_ALT;
+    case dom::KeyboardEvent_Binding::DOM_VK_META:
+    case dom::KeyboardEvent_Binding::DOM_VK_WIN:
+      return MODIFIER_META;
+    default:
+      return 0;
+  }
+}
+
+// static
+void LookAndFeel::Refresh() {
+  nsLookAndFeel::GetInstance()->RefreshImpl();
+  widget::Theme::LookAndFeelChanged();
+}
+
+// static
+void LookAndFeel::NativeInit() { nsLookAndFeel::GetInstance()->NativeInit(); }
+
+// static
+void LookAndFeel::SetData(widget::FullLookAndFeel&& aTables) {
+  nsLookAndFeel::GetInstance()->SetDataImpl(std::move(aTables));
+}
+
+}  // namespace mozilla