1 files changed, 111 insertions, 0 deletions
diff --git a/widget/ThemeColors.h b/widget/ThemeColors.h
new file mode 100644
index 0000000000..706f10a0e3
--- /dev/null
+++ b/widget/ThemeColors.h
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 40; 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/. */
+
+#ifndef mozilla_widget_ThemeColors_h
+#define mozilla_widget_ThemeColors_h
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/LookAndFeel.h"
+#include "nsIFrame.h"
+
+namespace mozilla::widget {
+
+static constexpr gfx::sRGBColor sDefaultAccent(
+    gfx::sRGBColor::UnusualFromARGB(0xff0060df));  // Luminance: 13.69346%
+static constexpr gfx::sRGBColor sDefaultAccentText(
+    gfx::sRGBColor::OpaqueWhite());
+
+struct ColorPalette;
+
+class ThemeAccentColor {
+ protected:
+  using sRGBColor = mozilla::gfx::sRGBColor;
+  using ComputedStyle = mozilla::ComputedStyle;
+
+  Maybe<nscolor> mAccentColor;
+  const ColorPalette* mDefaultPalette = nullptr;
+
+ public:
+  explicit ThemeAccentColor(const ComputedStyle&, ColorScheme);
+  virtual ~ThemeAccentColor() = default;
+
+  sRGBColor Get() const;
+  sRGBColor GetForeground() const;
+  sRGBColor GetLight() const;
+  sRGBColor GetDark() const;
+  sRGBColor GetDarker() const;
+};
+
+// Widget color information associated to a particular frame.
+class ThemeColors {
+ protected:
+  using Document = mozilla::dom::Document;
+  using sRGBColor = mozilla::gfx::sRGBColor;
+  using LookAndFeel = mozilla::LookAndFeel;
+  using StyleSystemColor = mozilla::StyleSystemColor;
+  using AccentColor = ThemeAccentColor;
+
+  const Document& mDoc;
+  const bool mHighContrast;
+  const ColorScheme mColorScheme;
+  const AccentColor mAccentColor;
+
+ public:
+  explicit ThemeColors(const nsIFrame* aFrame, StyleAppearance aAppearance)
+      : mDoc(*aFrame->PresContext()->Document()),
+        mHighContrast(ShouldBeHighContrast(*aFrame->PresContext())),
+        mColorScheme(ColorSchemeForWidget(aFrame, aAppearance, mHighContrast)),
+        mAccentColor(*aFrame->Style(), mColorScheme) {}
+  virtual ~ThemeColors() = default;
+
+  [[nodiscard]] static float ScaleLuminanceBy(float aLuminance, float aFactor) {
+    return aLuminance >= 0.18f ? aLuminance * aFactor : aLuminance / aFactor;
+  }
+
+  const AccentColor& Accent() const { return mAccentColor; }
+  bool HighContrast() const { return mHighContrast; }
+  bool IsDark() const { return mColorScheme == ColorScheme::Dark; }
+
+  nscolor SystemNs(StyleSystemColor aColor) const {
+    return LookAndFeel::Color(aColor, mColorScheme,
+                              LookAndFeel::ShouldUseStandins(mDoc, aColor));
+  }
+
+  sRGBColor System(StyleSystemColor aColor) const {
+    return sRGBColor::FromABGR(SystemNs(aColor));
+  }
+
+  template <typename Compute>
+  sRGBColor SystemOrElse(StyleSystemColor aColor, Compute aCompute) const {
+    if (auto color = LookAndFeel::GetColor(
+            aColor, mColorScheme,
+            LookAndFeel::ShouldUseStandins(mDoc, aColor))) {
+      return sRGBColor::FromABGR(*color);
+    }
+    return aCompute();
+  }
+
+  std::pair<sRGBColor, sRGBColor> SystemPair(StyleSystemColor aFirst,
+                                             StyleSystemColor aSecond) const {
+    return std::make_pair(System(aFirst), System(aSecond));
+  }
+
+  // Whether we should use system colors (for high contrast mode).
+  static bool ShouldBeHighContrast(const nsPresContext&);
+  static ColorScheme ColorSchemeForWidget(const nsIFrame*, StyleAppearance,
+                                          bool aHighContrast);
+
+  static void RecomputeAccentColors();
+
+  static nscolor ComputeCustomAccentForeground(nscolor aColor);
+
+  static nscolor AdjustUnthemedScrollbarThumbColor(nscolor aFaceColor,
+                                                   dom::ElementState aStates);
+};
+
+}  // namespace mozilla::widget
+
+#endif