From 8f903acaa6e3cf2d5ce05eabdfae66fb9b31e40e Mon Sep 17 00:00:00 2001
From: Michael Jumper <mike.jumper@guac-dev.org>
Date: Thu, 16 Oct 2014 22:49:51 -0700
Subject: [PATCH] GUAC-823: Test for CSS3 cursor support.

---
 .../src/main/webapp/modules/Mouse.js          | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/guacamole-common-js/src/main/webapp/modules/Mouse.js b/guacamole-common-js/src/main/webapp/modules/Mouse.js
index a27eae7ab..9e7f9e1d1 100644
--- a/guacamole-common-js/src/main/webapp/modules/Mouse.js
+++ b/guacamole-common-js/src/main/webapp/modules/Mouse.js
@@ -310,7 +310,30 @@ Guacamole.Mouse = function(element) {
      * @private
      * @type Boolean
      */
-    var CSS3_CURSOR_SUPPORTED = true;
+    var CSS3_CURSOR_SUPPORTED = (function() {
+
+        var div = document.createElement("div");
+
+        // If no cursor property at all, then no support
+        if (!("cursor" in div.style))
+            return false;
+
+        try {
+            // Apply simple 1x1 PNG
+            div.style.cursor = "url(data:image/png;base64,"
+                             + "iVBORw0KGgoAAAANSUhEUgAAAAEAAAAB"
+                             + "AQMAAAAl21bKAAAAA1BMVEX///+nxBvI"
+                             + "AAAACklEQVQI12NgAAAAAgAB4iG8MwAA"
+                             + "AABJRU5ErkJggg==) 0 0, auto";
+        }
+        catch (e) {
+            return false;
+        }
+
+        // Verify cursor property is set to URL with hotspot
+        return /\burl\([^()]*\)\s+0\s+0\b/.test(div.style.cursor || "");
+
+    })();
 
     /**
      * Changes the local mouse cursor to the given canvas, having the given