Removes util.js. Fixes prezi.

modules/UI/util/UIUtil.js

@@ -17,6 +17,64 @@ module.exports = {
      */
     buttonClick: function(id, classname) {
         $(id).toggleClass(classname); // add the class to the clicked element
+    },
+    /**
+     * Returns the text width for the given element.
+     *
+     * @param el the element
+     */
+    getTextWidth: function (el) {
+        return (el.clientWidth + 1);
+    },
+
+    /**
+     * Returns the text height for the given element.
+     *
+     * @param el the element
+     */
+    getTextHeight: function (el) {
+        return (el.clientHeight + 1);
+    },
+
+    /**
+     * Plays the sound given by id.
+     *
+     * @param id the identifier of the audio element.
+     */
+    playSoundNotification: function (id) {
+        document.getElementById(id).play();
+    },
+
+    /**
+     * Escapes the given text.
+     */
+    escapeHtml: function (unsafeText) {
+        return $('<div/>').text(unsafeText).html();
+    },
+
+    imageToGrayScale: function (canvas) {
+        var context = canvas.getContext('2d');
+        var imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+        var pixels  = imgData.data;
+
+        for (var i = 0, n = pixels.length; i < n; i += 4) {
+            var grayscale
+                = pixels[i] * .3 + pixels[i+1] * .59 + pixels[i+2] * .11;
+            pixels[i  ] = grayscale;        // red
+            pixels[i+1] = grayscale;        // green
+            pixels[i+2] = grayscale;        // blue
+            // pixels[i+3]              is alpha
+        }
+        // redraw the image in black & white
+        context.putImageData(imgData, 0, 0);
+    },
+
+    setTooltip: function (element, tooltipText, position) {
+        element.setAttribute("data-content", tooltipText);
+        element.setAttribute("data-toggle", "popover");
+        element.setAttribute("data-placement", position);
+        element.setAttribute("data-html", true);
+        element.setAttribute("data-container", "body");
     }