(check_face_name): New function.

(add_font_entity_to_list): Use it to filter out common substituted fonts.

src/ChangeLog

+2008-11-23  Jason Rumney  <jasonr@gnu.org>
+
+	* w32uniscribe.c (uniscribe_encode_char): Ensure context is
+	restored before returning.
+
+	* w32font.c (check_face_name): New function.
+	(add_font_entity_to_list): Use it to filter out common substituted
+	fonts.
+
 2008-11-22  Martin Rudalics  <rudalics@gmx.at>
 
 	* buffer.c (Fswitch_to_buffer): Reword and mention new option

src/w32font.c

@@ -811,10 +811,8 @@ w32font_open_internal (f, font_entity, pixel_size, font_object)
     }
 
   if (!metrics)
-    {
-      GetTextMetricsW (dc, &w32_font->metrics);
-    }
-
+    GetTextMetricsW (dc, &w32_font->metrics);
+  
   w32_font->cached_metrics = NULL;
   w32_font->n_cache_blocks = 0;
 
@@ -1300,6 +1298,40 @@ w32font_coverage_ok (coverage, charset)
   return 1;
 }
 
+
+static int
+check_face_name (font, full_name)
+     LOGFONT *font;
+     char *full_name;
+{
+  char full_iname[LF_FULLFACESIZE+1];
+
+  /* Just check for names known to cause problems, since the full name
+     can contain expanded abbreviations, prefixed foundry, postfixed
+     style, the latter of which sometimes differs from the style indicated
+     in the shorter name (eg Lt becomes Light or even Extra Light)  */
+
+  /* Helvetica is mapped to Arial in Windows, but if a Type-1 Helvetica is
+     installed, we run into problems with the Uniscribe backend which tries
+     to avoid non-truetype fonts, and ends up mixing the Type-1 Helvetica
+     with Arial's characteristics, since that attempt to use Truetype works
+     some places, but not others.  */
+  if (!stricmp (font->lfFaceName, "helvetica"))
+    {
+      strncpy (full_iname, full_name, LF_FULLFACESIZE);
+      full_iname[LF_FULLFACESIZE] = 0;
+      _strlwr (full_iname);
+      return strstr ("helvetica", full_iname);
+    }
+  else if (!stricmp (font->lfFaceName, "times"))
+    /* Since Times is mapped to Times New Roman, a substring
+       match is not sufficient to filter out the bogus match.  */
+    return stricmp (full_name, "times");
+
+  return 1;
+}
+
+
 /* Callback function for EnumFontFamiliesEx.
  * Checks if a font matches everything we are trying to check agaist,
  * and if so, adds it to a list. Both the data we are checking against
@@ -1340,7 +1372,11 @@ add_font_entity_to_list (logical_font, physical_font, font_type, lParam)
          anywhere within the full name.  */
       && (logical_font->elfLogFont.lfOutPrecision != OUT_STRING_PRECIS
           || strstr (logical_font->elfFullName,
-                     logical_font->elfLogFont.lfFaceName)))
+                     logical_font->elfLogFont.lfFaceName))
+      /* Check for well known substitutions that mess things up in the
+	 presence of Type-1 fonts of the same name.  */
+      && (match_data->pattern.lfFaceName[0]
+	  && check_face_name (logical_font, logical_font->elfFullName)))
     {
       Lisp_Object entity
         = w32_enumfont_pattern_entity (match_data->frame, logical_font,