1 files changed, 137 insertions, 0 deletions
diff --git a/layout/style/PreferenceSheet.h b/layout/style/PreferenceSheet.h
new file mode 100644
index 0000000000..3b3c2f70b7
--- /dev/null
+++ b/layout/style/PreferenceSheet.h
@@ -0,0 +1,137 @@
+/* -*- 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 prefable colors for style system use */
+
+#ifndef mozilla_ColorPreferences_h
+#define mozilla_ColorPreferences_h
+
+#include "nsColor.h"
+#include "mozilla/ColorScheme.h"
+
+namespace mozilla {
+
+namespace dom {
+class Document;
+}
+
+struct PreferenceSheet {
+  struct Prefs {
+    struct Colors {
+      nscolor mLink = NS_RGB(0x00, 0x00, 0xEE);
+      nscolor mActiveLink = NS_RGB(0xEE, 0x00, 0x00);
+      nscolor mVisitedLink = NS_RGB(0x55, 0x1A, 0x8B);
+
+      nscolor mDefault = NS_RGB(0, 0, 0);
+      nscolor mDefaultBackground = NS_RGB(0xFF, 0xFF, 0xFF);
+
+      nscolor mFocusText = mDefault;
+      nscolor mFocusBackground = mDefaultBackground;
+    } mLightColors, mDarkColors;
+
+    const Colors& ColorsFor(ColorScheme aScheme) const {
+      return mMustUseLightColorSet || aScheme == ColorScheme::Light
+                 ? mLightColors
+                 : mDarkColors;
+    }
+
+    bool mIsChrome = false;
+    bool mUseAccessibilityTheme = false;
+    bool mUseDocumentColors = true;
+    bool mUsePrefColors = false;
+    bool mUseStandins = false;
+    bool mMustUseLightColorSet = false;
+
+    // Sometimes we can force a color scheme on a document, or honor the
+    // preferred color-scheme in more cases, depending on whether we're forcing
+    // colors or not.
+    enum class ColorSchemeChoice : uint8_t {
+      // We're not forcing colors, use standard algorithm based on specified
+      // style and meta tags and so on.
+      Standard,
+      // We can honor whatever the preferred color-scheme for the document is
+      // (the preferred color-scheme of the user, since we're forcing colors).
+      UserPreferred,
+      Light,
+      Dark,
+    };
+
+    ColorSchemeChoice mColorSchemeChoice = ColorSchemeChoice::Standard;
+
+    // Whether the non-native theme should use real system colors for widgets.
+    bool NonNativeThemeShouldBeHighContrast() const;
+
+    void Load(bool aIsChrome);
+    void LoadColors(bool aIsLight);
+  };
+
+  static void EnsureInitialized() {
+    if (sInitialized) {
+      return;
+    }
+    Initialize();
+  }
+
+  static void Refresh() {
+    sInitialized = false;
+    Initialize();
+  }
+
+  static bool AffectedByPref(const nsACString&);
+
+  static Prefs& ContentPrefs() {
+    MOZ_ASSERT(sInitialized);
+    return sContentPrefs;
+  }
+
+  static Prefs& ChromePrefs() {
+    MOZ_ASSERT(sInitialized);
+    return sChromePrefs;
+  }
+
+  static Prefs& PrintPrefs() {
+    MOZ_ASSERT(sInitialized);
+    return sPrintPrefs;
+  }
+
+  enum class PrefsKind {
+    Chrome,
+    Print,
+    Content,
+  };
+
+  static PrefsKind PrefsKindFor(const dom::Document&);
+
+  static bool ShouldUseChromePrefs(const dom::Document& aDocument) {
+    return PrefsKindFor(aDocument) == PrefsKind::Chrome;
+  }
+
+  static bool MayForceColors() { return !ContentPrefs().mUseDocumentColors; }
+
+  static const Prefs& PrefsFor(const dom::Document& aDocument) {
+    switch (PrefsKindFor(aDocument)) {
+      case PrefsKind::Chrome:
+        return ChromePrefs();
+      case PrefsKind::Print:
+        return PrintPrefs();
+      case PrefsKind::Content:
+        break;
+    }
+    return ContentPrefs();
+  }
+
+ private:
+  static bool sInitialized;
+  static Prefs sChromePrefs;
+  static Prefs sPrintPrefs;
+  static Prefs sContentPrefs;
+
+  static void Initialize();
+};
+
+}  // namespace mozilla
+
+#endif