fixed SvgImage.GetImage

Source/Basic Shapes/SvgImage.cs

@@ -234,9 +234,22 @@ namespace Svg
 
         protected object GetImage(string uriString)
         {
+            var uriString = this.Href;
+
+            string safeUriString;
+            if (uriString.Length > 65519)
+            {
+                safeUriString = uriString.Substring(0,
+                                                    65519);
+            }
+            else
+            {
+                safeUriString = uriString;
+            }
+
             try
             {
-                var uri = new Uri(uriString.Substring(0, 65519)); //Uri MaxLength is 65519 (https://msdn.microsoft.com/en-us/library/z6c2z492.aspx)
+                var uri = new Uri(safeUriString); //Uri MaxLength is 65519 (https://msdn.microsoft.com/en-us/library/z6c2z492.aspx)
 
                 // handle data/uri embedded images (http://en.wikipedia.org/wiki/Data_URI_scheme)
                 if (uri.IsAbsoluteUri && uri.Scheme == "data")