Merge pull request #496 from everyx/feature#490

Feature #490 We can get proxy state according to tray icon color

shadowsocks-csharp/View/MenuViewController.cs

@@ -123,19 +123,7 @@ namespace Shadowsocks.View
             Configuration config = controller.GetConfigurationCopy();
             bool enabled = config.enabled;
             bool global = config.global;
-            if (!enabled)
-            {
-                Bitmap iconCopy = new Bitmap(icon);
-                for (int x = 0; x < iconCopy.Width; x++)
-                {
-                    for (int y = 0; y < iconCopy.Height; y++)
-                    {
-                        Color color = icon.GetPixel(x, y);
-                        iconCopy.SetPixel(x, y, Color.FromArgb((byte)(color.A / 1.25), color.R, color.G, color.B));
-                    }
-                }
-                icon = iconCopy;
-            }
+            icon = getTrayIconByState(icon, enabled, global);
             _notifyIcon.Icon = Icon.FromHandle(icon.GetHicon());
 
             string serverInfo = null;
@@ -156,6 +144,39 @@ namespace Shadowsocks.View
             _notifyIcon.Text = text.Substring(0, Math.Min(63, text.Length));
         }
 
+        private Bitmap getTrayIconByState(Bitmap originIcon, bool enabled, bool global)
+        {
+            Bitmap iconCopy = new Bitmap(originIcon);
+            for (int x = 0; x < iconCopy.Width; x++)
+            {
+                for (int y = 0; y < iconCopy.Height; y++)
+                {
+                    Color color = originIcon.GetPixel(x, y);
+                    if (color.A != 0 && color.R > 30)
+                    {
+                        if (!enabled)
+                        {
+                            iconCopy.SetPixel(x, y, Color.FromArgb((byte)(color.A / 1.25), color.R, color.G, color.B));
+                        }
+                        else if (global)
+                        {
+                            Color flyBlue = Color.FromArgb(25, 125, 191);
+                            // Muliply with flyBlue
+                            int red   = color.R * flyBlue.R / 255;
+                            int green = color.G * flyBlue.G / 255; 
+                            int blue  = color.B * flyBlue.B / 255;
+                            iconCopy.SetPixel(x, y, Color.FromArgb(color.A, red, green, blue));
+                        }
+                    }
+                    else
+                    {
+                        iconCopy.SetPixel(x, y, Color.FromArgb(color.A, color.R, color.G, color.B));
+                    }
+                }
+            }
+            return iconCopy;
+        }
+
         private MenuItem CreateMenuItem(string text, EventHandler click)
         {
             return new MenuItem(I18N.GetString(text), click);