Added adaptive text color

Added two functions. The name of the color now appears either in black or in white, depending of the brightness of the choosen color.
Especially for very bright colors, you can't read a text with 'color: #FFFFFF'

Author: Fulligan

jquery.simple-color.js

@@ -7,7 +7,7 @@
  * Licensed under the MIT license:
  *   http://www.opensource.org/licenses/mit-license.php
  *
- * Version: 1.2.1 (Sat, 19 Aug 2017 07:42:40 GMT)
+ * Version: 1.2.2 (Mon, 19 May 2014 20:22:47 GMT)
  */
  (function($) {
 /**
@@ -236,6 +236,9 @@
             displayBox.css('background-color', displayBox.data('color'));
             if (options.displayColorCode) {
               displayBox.text(displayBox.data('color'));
+			  displayBox.css({
+			    'color':     getTextColor(displayBox.data('color')),
+			  });
             }
           }
           // Execute onClose callback whenever the color chooser is closed.
@@ -300,6 +303,9 @@
               // If 'displayColorCode' is turned on, display the currently selected color code as text inside the button.
               if (options.displayColorCode) {
                 event.data.displayBox.text(color);
+				event.data.displayBox.css({
+					'color':     getTextColor(displayBox.data('color'))
+				});
               }
 
               // If an onSelect callback function is defined then excecute it.
@@ -361,3 +367,24 @@
   };
 
 })(jQuery);
+
+function getTextColor(color){
+
+	rgbColor = hexToRgb(color);
+	textColor =
+		0.213 * rgbColor.r/255 +
+		0.715 * rgbColor.g/255 +
+		0.072 * rgbColor.b/255
+		< 0.5 ? '#FFFFFF' : '#000000';
+
+  return textColor;
+}
+
+function hexToRgb(hex) {
+    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result ? {
+        r: parseInt(result[1], 16),
+        g: parseInt(result[2], 16),
+        b: parseInt(result[3], 16)
+    } : null;
+}