Backport of subtitle core enhancements from trunk.

include/vlc_video.h

@@ -4,7 +4,7 @@
  * includes all common video types and constants.
  *****************************************************************************
  * Copyright (C) 1999 - 2005 the VideoLAN team
- * $Id$
+ * $Id: f4b8947c9c5576a9034df60c231e35edfde36710 $
  *
  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  *
@@ -302,6 +302,11 @@ struct subpicture_t
 #define SUBPICTURE_ALIGN_RIGHT 0x2
 #define SUBPICTURE_ALIGN_TOP 0x4
 #define SUBPICTURE_ALIGN_BOTTOM 0x8
+#define SUBPICTURE_ALIGN_MASK ( SUBPICTURE_ALIGN_LEFT|SUBPICTURE_ALIGN_RIGHT| \
+                                SUBPICTURE_ALIGN_TOP |SUBPICTURE_ALIGN_BOTTOM )
+
+/* Subpicture rendered flag - should only be used by vout_subpictures */
+#define SUBPICTURE_RENDERED  0x10
 
 /*****************************************************************************
  * Prototypes