[type42] Allow only embedded TrueType fonts.

This is a follow-up to Savannah bug #43659.

* src/type42/t42objs.c (T42_Face_Init): Exclusively use the
`truetype' font driver for loading the font contained in the `sfnts'
array.

ChangeLog

@@ -1,3 +1,13 @@
+2014-11-22  Werner Lemberg  <wl@gnu.org>
+
+	[type42] Allow only embedded TrueType fonts.
+
+	This is a follow-up to Savannah bug #43659.
+
+	* src/type42/t42objs.c (T42_Face_Init): Exclusively use the
+	`truetype' font driver for loading the font contained in the `sfnts'
+	array.
+
 2014-11-22  Werner Lemberg  <wl@gnu.org>
 
 	[type42] Fix Savannah bug #43659.

src/type42/t42objs.c

@@ -292,7 +292,9 @@
       FT_Open_Args  args;
 
 
-      args.flags       = FT_OPEN_MEMORY;
+      args.flags       = FT_OPEN_MEMORY | FT_OPEN_DRIVER;
+      args.driver      = FT_Get_Module( FT_FACE_LIBRARY( face ),
+                                        "truetype" );
       args.memory_base = face->ttf_data;
       args.memory_size = face->ttf_size;