1 files changed, 27 insertions, 0 deletions
diff --git a/widget/windows/nsLookAndFeel.h b/widget/windows/nsLookAndFeel.h
index bc2d158b6..6200541f5 100644
--- a/widget/windows/nsLookAndFeel.h
+++ b/widget/windows/nsLookAndFeel.h
@@ -6,6 +6,7 @@
 #ifndef __nsLookAndFeel
 #define __nsLookAndFeel
 #include "nsXPLookAndFeel.h"
+#include "nsIWindowsRegKey.h"
 
 /*
  * Gesture System Metrics
@@ -59,7 +60,33 @@ public:
   virtual void SetIntCacheImpl(const nsTArray<LookAndFeelInt>& aLookAndFeelIntCache);
 
 private:
+  /**
+   * Fetches the Windows accent color from the Windows settings if
+   * the accent color is set to apply to the title bar, otherwise
+   * returns an error code.
+   */
+  nsresult GetAccentColor(nscolor& aColor);
+  
+  /**
+   * Determines whether the Windows accent color is considered dark
+   * with a threshhold value and formula that are specified in the
+   * UWP guidelines.
+   * See: https://docs.microsoft.com/en-us/windows/uwp/style/color
+   */
+  bool AccentColorIsDark(nscolor aColor);
+  
+  /**
+   * If the Windows accent color from the Windows settings is set
+   * to apply to the title bar, this computes the color that should
+   * be used for text that is to be written over a background that has
+   * the accent color.  Otherwise, (if the accent color should not
+   * apply to the title bar) this returns an error code.
+   */
+  nsresult GetAccentColorText(nscolor& aColor);
+
   int32_t mUseAccessibilityTheme;
+  
+  nsCOMPtr<nsIWindowsRegKey> mDwmKey;
 };
 
 #endif