New Variation Font function `FT_Get_Default_Named_Instance`.

* include/freetype/ftmm.h, src/base/ftmm.c (FT_Get_Default_Named_Instance):
New function.

* include/freetype/internal/services/svmm.h
(FT_Get_Default_Named_Instance_Func): New typedef.
(FT_Service_MultiMasters): New field `get_default_named_instance`.
(FT_DEFINE_SERVICE_MULTIMASTERSREC): Updated.

* include/freetype/internal/tttypes.h (TT_Face): New field
`var_default_named_instance`.

* src/sfnt/sfobjc.s (sfnt_init_face): Initialize
`var_default_named_instance`.

* src/cff/cffdrivr.c (cff_get_default_named_instance): New function.
(cff_service_multi_masters): Updated.

* src/truetype/ttgxvar.c (TT_Get_MM_Var): Initialize
`var_default_named_instance`.
(TT_Get_Default_Named_Instance): New function.
* src/truetype/ttgxvar.h: Updated.
* src/truetype/ttdriver.c (tt_service_gx_multi_masters): Updated.

* src/type1/t1driver.c (t1_service_multi_masters): Updated.

* docs/CHANGES: Updated.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/base/ftmm.c b/src/base/ftmm.c
index a2b4bd03d..781db315e 100644
--- a/src/base/ftmm.c
+++ b/src/base/ftmm.c
@@ -565,4 +565,32 @@
   }
 
 
+  /* documentation is in ftmm.h */
+
+  FT_EXPORT_DEF( FT_Error )
+  FT_Get_Default_Named_Instance( FT_Face   face,
+                                 FT_UInt  *instance_index )
+  {
+    FT_Error  error;
+
+    FT_Service_MultiMasters  service_mm = NULL;
+
+
+    /* check of `face' delayed to `ft_face_get_mm_service' */
+
+    error = ft_face_get_mm_service( face, &service_mm );
+    if ( !error )
+    {
+      /* no error if `get_default_named_instance` is not available */
+      if ( service_mm->get_default_named_instance )
+        error = service_mm->get_default_named_instance( face,
+                                                        instance_index );
+      else
+        error = FT_Err_Ok;
+    }
+
+    return error;
+  }
+
+
 /* END */