If the font driver doesn't have `shape' function, return Qnil.

diff --git a/src/font.c b/src/font.c
index c63a158..57609a8 100644 (file)
--- a/src/font.c
+++ b/src/font.c
@@ -3625,6 +3625,12 @@ FONT-OBJECT.  */)
   Lisp_Object gstring, n;
   int len, i, j;
 
+  if (! FONT_OBJECT_P (font_object))
+    return Qnil;
+  CHECK_FONT_GET_OBJECT (font_object, font);
+  if (! font->driver->shape)
+    return Qnil;
+
   if (NILP (string))
     {
       validate_region (&from, &to);
@@ -3641,49 +3647,9 @@ FONT-OBJECT.  */)
        args_out_of_range_3 (string, from, to);
     }
 
-  if (! FONT_OBJECT_P (font_object))
-    return to;
-
-  CHECK_FONT_GET_OBJECT (font_object, font);
   len = end - start;
   gstring = Ffont_make_gstring (font_object, make_number (len));
   Ffont_fill_gstring (gstring, font_object, from, to, string);
-  if (! font->driver->shape)
-    {
-      /* Make zero-width glyphs to have one pixel width to make the
-        display routine not lose the cursor.  */
-      for (i = 0; i < len; i++)
-       {
-         Lisp_Object g = LGSTRING_GLYPH (gstring, i);
-         unsigned code;
-         struct font_metrics metrics;
-
-         if (NILP (g))
-           break;
-         code = LGLYPH_CODE (g);
-         if (font->driver->text_extents (font, &code, 1, &metrics) == 0)
-           {
-             Lisp_Object gstr = Ffont_make_gstring (font_object,
-                                                    make_number (1));
-             LGSTRING_SET_WIDTH (gstr, 1);
-             LGSTRING_SET_LBEARING (gstr, metrics.lbearing);
-             LGSTRING_SET_RBEARING (gstr, metrics.rbearing + 1);
-             LGSTRING_SET_ASCENT (gstr, metrics.ascent);
-             LGSTRING_SET_DESCENT (gstr, metrics.descent);
-             LGLYPH_SET_FROM (g, 0);
-             LGLYPH_SET_TO (g, 1);
-             LGSTRING_SET_GLYPH (gstr, 0, g);
-             from = make_number (start + i);
-             to = make_number (start + i + 1);
-             if (NILP (string))
-               Fcompose_region_internal (from, to, gstr, Qnil);
-             else
-               Fcompose_string_internal (string, from, to, gstr, Qnil);
-           }
-       }
-      return make_number (end);
-    }
-
   
   /* Try at most three times with larger gstring each time.  */
   for (i = 0; i < 3; i++)