Monotone-Parent: 4da2e2aa68da3f6c69bddae3167041872607c9d2

Monotone-Revision: 589cbe87a5260166298c57c4fa50494edb7b9fbd

Monotone-Author: wsourdeau@inverse.ca
Monotone-Date: 2008-04-22T17:16:37
Monotone-Branch: ca.inverse.sogo

UI/WebServerResources/generic.js

@@ -307,6 +307,23 @@ function onAjaxRequestStateChange(http) {
   }
 }
 
+/* taken from Lightning */
+function getContrastingTextColor(bgColor) {
+  var calcColor = bgColor.substring(1);
+  var red = parseInt(calcColor.substring(0, 2), 16);
+  var green = parseInt(calcColor.substring(2, 4), 16);
+  var blue = parseInt(calcColor.substring(4, 6), 16);
+
+  // Calculate the brightness (Y) value using the YUV color system.
+  var brightness = (0.299 * red) + (0.587 * green) + (0.114 * blue);
+  
+  // Consider all colors with less than 56% brightness as dark colors and
+  // use white as the foreground color, otherwise use black.
+  return ((brightness < 144)
+	  ? "white"
+	  : "black");
+}
+
 function triggerAjaxRequest(url, callback, userdata, content, headers) {
   var http = createHTTPClient();