diff --git a/guacamole-common-js/src/main/resources/guacamole.js b/guacamole-common-js/src/main/resources/guacamole.js
index 9c549f896..7d182d616 100644
--- a/guacamole-common-js/src/main/resources/guacamole.js
+++ b/guacamole-common-js/src/main/resources/guacamole.js
@@ -1470,21 +1470,35 @@ Guacamole.Client = function(tunnel) {
             var srcY = parseInt(parameters[2]);
             var srcWidth = parseInt(parameters[3]);
             var srcHeight = parseInt(parameters[4]);
-            var transferFunction = Guacamole.Client.DefaultTransferFunction[parameters[5]];
+            var function_index = parseInt(parameters[5]);
             var dstL = getLayer(parseInt(parameters[6]));
             var dstX = parseInt(parameters[7]);
             var dstY = parseInt(parameters[8]);
 
-            dstL.transfer(
-                srcL,
-                srcX,
-                srcY,
-                srcWidth, 
-                srcHeight, 
-                dstX,
-                dstY,
-                transferFunction
-            );
+            /* SRC */
+            if (function_index === 0x3)
+                dstL.put(
+                    srcL,
+                    srcX,
+                    srcY,
+                    srcWidth, 
+                    srcHeight, 
+                    dstX,
+                    dstY
+                );
+
+            /* Anything else that isn't a NO-OP */
+            else if (function_index !== 0x5)
+                dstL.transfer(
+                    srcL,
+                    srcX,
+                    srcY,
+                    srcWidth, 
+                    srcHeight, 
+                    dstX,
+                    dstY,
+                    Guacamole.Client.DefaultTransferFunction[function_index]
+                );
 
         },
 
diff --git a/guacamole-common-js/src/main/resources/layer.js b/guacamole-common-js/src/main/resources/layer.js
index b5db45841..d91b8a4e4 100644
--- a/guacamole-common-js/src/main/resources/layer.js
+++ b/guacamole-common-js/src/main/resources/layer.js
@@ -647,6 +647,51 @@ Guacamole.Layer = function(width, height) {
         });
     };
 
+    /**
+     * Put a rectangle of image data from one Layer to this Layer directly
+     * without performing any alpha blending. Simply copy the data.
+     * 
+     * @param {Guacamole.Layer} srcLayer The Layer to copy image data from.
+     * @param {Number} srcx The X coordinate of the upper-left corner of the
+     *                      rectangle within the source Layer's coordinate
+     *                      space to copy data from.
+     * @param {Number} srcy The Y coordinate of the upper-left corner of the
+     *                      rectangle within the source Layer's coordinate
+     *                      space to copy data from.
+     * @param {Number} srcw The width of the rectangle within the source Layer's
+     *                      coordinate space to copy data from.
+     * @param {Number} srch The height of the rectangle within the source
+     *                      Layer's coordinate space to copy data from.
+     * @param {Number} x The destination X coordinate.
+     * @param {Number} y The destination Y coordinate.
+     */
+    this.put = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
+        scheduleTaskSynced(srcLayer, function() {
+
+            var srcCanvas = srcLayer.getCanvas();
+
+            // If entire rectangle outside source canvas, stop
+            if (srcx >= srcCanvas.width || srcy >= srcCanvas.height) return;
+
+            // Otherwise, clip rectangle to area
+            if (srcx + srcw > srcCanvas.width)
+                srcw = srcCanvas.width - srcx;
+
+            if (srcy + srch > srcCanvas.height)
+                srch = srcCanvas.height - srcy;
+
+            // Stop if nothing to draw.
+            if (srcw == 0 || srch == 0) return;
+
+            if (layer.autosize != 0) fitRect(x, y, srcw, srch);
+
+            // Get image data from src and dst
+            var src = srcLayer.getCanvas().getContext("2d").getImageData(srcx, srcy, srcw, srch);
+            displayContext.putImageData(src, x, y);
+
+        });
+    };
+
     /**
      * Copy a rectangle of image data from one Layer to this Layer. This
      * operation will copy exactly the image data that will be drawn once all
diff --git a/guacamole/src/main/webapp/scripts/client-ui.js b/guacamole/src/main/webapp/scripts/client-ui.js
index a0c896981..f24b9b59a 100644
--- a/guacamole/src/main/webapp/scripts/client-ui.js
+++ b/guacamole/src/main/webapp/scripts/client-ui.js
@@ -933,24 +933,6 @@ GuacUI.Client.attach = function(guac) {
 
     };
 
-    var thumbnail_update_interval = null;
-
-    window.onblur = function() {
-
-        // Regularly update screenshot if window not visible
-        if (!thumbnail_update_interval)
-            thumbnail_update_interval =
-                window.setInterval(GuacUI.Client.updateThumbnail, 1000);
-
-    };
-
-    window.onfocus = function() {
-        if (thumbnail_update_interval) {
-            window.clearInterval(thumbnail_update_interval);
-            thumbnail_update_interval = null;
-        }
-    };
-
     /*
      * Disconnect and update thumbnail on close
      */