diff --git a/js/x11/core/ext/composite.js b/js/x11/core/ext/composite.js
new file mode 100644
index 0000000..3136388
--- /dev/null
+++ b/js/x11/core/ext/composite.js
@@ -0,0 +1,117 @@
+// /usr/share/doc/x11proto-composite-dev/compositeproto.txt.gz
+// http://cgit.freedesktop.org/xorg/proto/compositeproto/plain/compositeproto.txt
+//
+// /usr/include/X11/extensions/Xcomposite.h       Xlib
+// /usr/include/X11/extensions/composite.h        constants
+// /usr/include/X11/extensions/compositeproto.h   structs
+//
+// http://ktown.kde.org/~fredrik/composite_howto.html
+//
+// server side source:
+//     http://cgit.freedesktop.org/xorg/xserver/tree/composite/compext.c
+//
+
+var x11 = Require('x11/core/x11');
+// TODO: move to templates
+
+exports.requireExt = function(display, callback)
+{
+    var X = display.client;
+    X.QueryExtension('Composite', function(err, ext) {
+
+        if (!ext.present)
+            return callback(new Error('extension not available'));
+
+        ext.Redirect = {
+            Automatic: 0,
+	    Manual: 1
+        };
+
+        ext.QueryVersion = function(clientMaj, clientMin, callback)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 0, 3, clientMaj, clientMin]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    var res = buf.unpack('LL');
+                    return res;
+                },
+                callback
+            ];
+            X.pack_stream.flush();
+        }
+
+        ext.RedirectWindow = function( window, updateType )
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLCxxx', [ext.majorOpcode, 1, 3, window, updateType]);
+            X.pack_stream.flush();
+        }
+
+        ext.RedirectSubwindows = function( window, updateType )
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLCxxx', [ext.majorOpcode, 2, 3, window, updateType]);
+            X.pack_stream.flush();
+        }
+
+        ext.UnredirectWindow = function(window)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 3, 2, window]);
+            X.pack_stream.flush();
+        }
+
+        ext.UnredirectSubwindows = function(window)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 4, 2, window]);
+            X.pack_stream.flush();
+        }
+
+        ext.CreateRegionFromBorderClip = function(region, window)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 5, 3, damage, region]);
+            X.pack_stream.flush();
+        }
+
+        ext.NameWindowPixmap = function(window, pixmap)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 6, 3, window, pixmap]);
+            X.pack_stream.flush();
+        }
+
+        ext.GetOverlayWindow = function(window, callback)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 7, 2, window]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    var res = buf.unpack('L');
+                    return res[0];
+                },
+                callback
+            ];
+            X.pack_stream.flush();
+        }
+
+        ext.ReleaseOverlayWindow = function(window)
+        {
+            X.seq_num++;
+            X.pack_stream.pack('CCSL', [ext.majorOpcode, 8, 2, window]);
+            X.pack_stream.flush();
+        }
+
+        // currently version 0.4 TODO: bump up with coordinate translations
+        ext.QueryVersion(0, 4, function(err, vers) {
+            if (err)
+                return callback(err);
+
+            ext.major = vers[0];
+            ext.minor = vers[1];
+            callback(null, ext);
+        });
+    });
+}