[type1] MM fonts support exactly zero named instances (#48748).

* src/type1/t1load.c (T1_Get_MM_Var): Set `num_namedstyles' to zero.

ChangeLog

@@ -1,3 +1,9 @@
+2016-09-06  Werner Lemberg  <wl@gnu.org>
+
+	[type1] MM fonts support exactly zero named instances (#48748).
+
+	* src/type1/t1load.c (T1_Get_MM_Var): Set `num_namedstyles' to zero.
+
 2016-09-06  Jonathan Kew  <jfkthame@gmail.com>
 
 	[cff] Fix uninitialized memory.

include/freetype/ftmm.h

@@ -195,11 +195,15 @@ FT_BEGIN_HEADER
   /*                       (where every glyph could have a different       */
   /*                       number of designs).                             */
   /*                                                                       */
-  /*    num_namedstyles :: The number of named styles; only meaningful for */
-  /*                       GX that allows certain design coordinates to    */
-  /*                       have a string ID (in the `name' table)          */
-  /*                       associated with them.  The font can tell the    */
-  /*                       user that, for example, Weight=1.5 is `Bold'.   */
+  /*    num_namedstyles :: The number of named styles; a `named style' is  */
+  /*                       a tuple of design coordinates that has a string */
+  /*                       ID (in the `name' table) associated with it.    */
+  /*                       The font can tell the user that, for example,   */
+  /*                       [Weight=1.5,Width=1.1] is `Bold'.               */
+  /*                                                                       */
+  /*                       For Type 1 Multiple Masters fonts, this value   */
+  /*                       is always zero because the format does not      */
+  /*                       support named styles.                           */
   /*                                                                       */
   /*    axis            :: An axis descriptor table.                       */
   /*                       GX fonts contain slightly more data than MM.    */

src/type1/t1load.c

@@ -321,7 +321,7 @@
 
     mmvar->num_axis        = mmaster.num_axis;
     mmvar->num_designs     = mmaster.num_designs;
-    mmvar->num_namedstyles = ~0U;                        /* Does not apply */
+    mmvar->num_namedstyles = 0;                           /* Not supported */
     mmvar->axis            = (FT_Var_Axis*)&mmvar[1];
                                       /* Point to axes after MM_Var struct */
     mmvar->namedstyle      = NULL;