change old picture serialization to really handle images

gm/cgm.c

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL
 // DO NOT USE -- FOR INTERNAL TESTING ONLY
 
@@ skipping 46 matching lines @@
     do_draw(sk_surface_get_canvas(surf));
 
     sk_image_t* img0 = sk_surface_new_image_snapshot(surf);
     sk_surface_unref(surf);
 
     sk_canvas_draw_image(canvas, img0, W + 10, 10, NULL);
 
     sk_data_t* data = sk_image_encode(img0);
     sk_image_unref(img0);
 
-    sk_image_t* img1 = sk_image_new_from_data(data);
+    sk_image_t* img1 = sk_image_new_from_encoded(data, NULL);
     sk_data_unref(data);
 
     if (img1) {
         sk_canvas_draw_image(canvas, img1, W/2, H/2, NULL);
         sk_image_unref(img1);
     }
 }