GUI桌面环境

Gui/UILib/Extensions.cs

@@ -0,0 +1,17 @@
+using System.Drawing;
+
+namespace CMLeonOS.Gui.UILib
+{
+    internal static class Extensions
+    {
+        internal static float GetLuminance(this Color color)
+        {
+            return (float)((color.R * 0.2126) + (color.G * 0.7152) + (color.B * 0.0722));
+        }
+
+        internal static Color GetForegroundColour(this Color color)
+        {
+            return color.GetLuminance() < 140 ? Color.White : Color.Black;
+        }
+    }
+}