Fixes to osgText for default parameter.

include/osgText/Text

@@ -67,6 +67,27 @@ public:
       * which is converted to an internal TextString.*/
     void setText(const std::string& text);
 
+    /**
+     * Types of string encodings supported
+     */
+    enum Encoding
+    {
+        ENCODING_UNDEFINED,                 /// not using Unicode
+        ENCODING_ASCII = ENCODING_UNDEFINED,/// unsigned char ASCII
+        ENCODING_UTF8,                      /// 8-bit unicode transformation format
+        ENCODING_UTF16,                     /// 16-bit signature
+        ENCODING_UTF16_BE,                  /// 16-bit big-endian
+        ENCODING_UTF16_LE,                  /// 16-bit little-endian
+        ENCODING_UTF32,                     /// 32-bit signature
+        ENCODING_UTF32_BE,                  /// 32-bit big-endian
+        ENCODING_UTF32_LE,                  /// 32-bit little-endian
+        ENCODING_SIGNATURE,                 /// detect encoding from signature
+    };
+
+    /** Set the text using a Unicode encoded std::string, which is converted to an internal TextString.
+      * The encoding parameter specificies which Unicode encodeding is used in the std::string. */
+    void setText(const std::string& text,Encoding encoding);
+
     /** Set the text using a wchar_t string, 
       * which is converted to an internal TextString.*/
     void setText(const wchar_t* text);