Display buffer name, etc. in mode line by composing correctly.

src/ChangeLog

+2010-01-13  Kenichi Handa  <handa@m17n.org>
+
+	Display buffer name, etc. in mode line by composing correctly.
+
+	* xdisp.c (reseat_to_string): Call composition_compute_stop_pos if
+	STRING is not nil.
+	(display_mode_element): Adjusted for the change of
+	decode_mode_spec and display_line.
+	(decode_mode_spec): Change arg MULTIBYTE to STRING.
+	(display_string): Handle the case that STRING is non-null and
+	LISP_STRING is not nil.
+
+	* xterm.c (x_draw_composite_glyph_string_foreground): Pay
+	attention to s->face->overstrike.
+
+	* composite.c (composition_reseat_it): Don't check PT if STRING is
+	non nil.
+
 2010-01-11  Chong Yidong  <cyd@stupidchicken.com>
 
 	* nsterm.m (syms_of_nsterm): Initialize Qcontrol etc. before

src/composite.c

@@ -1104,7 +1104,7 @@ composition_reseat_it (cmp_it, charpos, bytepos, endpos, w, face, string)
      struct face *face;
      Lisp_Object string;
 {
-  if (charpos < PT && PT < endpos)
+  if (NILP (string) && charpos < PT && PT < endpos)
     endpos = PT;
 
   if (cmp_it->ch == -2)

src/xdisp.c

@@ -953,7 +953,8 @@ static int display_mode_lines P_ ((struct window *));
 static int display_mode_line P_ ((struct window *, enum face_id, Lisp_Object));
 static int display_mode_element P_ ((struct it *, int, int, int, Lisp_Object, Lisp_Object, int));
 static int store_mode_line_string P_ ((char *, Lisp_Object, int, int, int, Lisp_Object));
-static char *decode_mode_spec P_ ((struct window *, int, int, int, int *));
+static char *decode_mode_spec P_ ((struct window *, int, int, int,
+				   Lisp_Object *));
 static void display_menu_bar P_ ((struct window *));
 static int display_count_lines P_ ((int, int, int, int, int *));
 static int display_string P_ ((unsigned char *, Lisp_Object, Lisp_Object,
@@ -5607,6 +5608,9 @@ reseat_to_string (it, s, string, charpos, precision, field_width, multibyte)
     it->dp = XCHAR_TABLE (Vstandard_display_table);
 
   it->stop_charpos = charpos;
+  if (s == NULL && it->multibyte_p)
+    composition_compute_stop_pos (&it->cmp_it, charpos, -1, it->end_charpos,
+				  it->string);
   CHECK_IT (it);
 }
 
@@ -17576,13 +17580,14 @@ display_mode_element (it, depth, field_width, precision, elt, props, risky)
 		    int multibyte;
 		    int bytepos, charpos;
 		    unsigned char *spec;
+		    Lisp_Object string;
 
 		    bytepos = percent_position;
 		    charpos = (STRING_MULTIBYTE (elt)
 			       ? string_byte_to_char (elt, bytepos)
 			       : bytepos);
-		    spec
-		      = decode_mode_spec (it->w, c, field, prec, &multibyte);
+		    spec = decode_mode_spec (it->w, c, field, prec, &string);
+		    multibyte = STRINGP (string) && STRING_MULTIBYTE (string);
 
 		    switch (mode_line_target)
 		      {
@@ -17604,7 +17609,7 @@ display_mode_element (it, depth, field_width, precision, elt, props, risky)
 			  int nglyphs_before, nwritten;
 
 			  nglyphs_before = it->glyph_row->used[TEXT_AREA];
-			  nwritten = display_string (spec, Qnil, elt,
+			  nwritten = display_string (spec, string, elt,
 						     charpos, 0, it,
 						     field, prec, 0,
 						     multibyte);
@@ -18267,8 +18272,8 @@ decode_mode_spec_coding (coding_system, buf, eol_flag)
 /* Return a string for the output of a mode line %-spec for window W,
    generated by character C.  PRECISION >= 0 means don't return a
    string longer than that value.  FIELD_WIDTH > 0 means pad the
-   string returned with spaces to that value.  Return 1 in *MULTIBYTE
-   if the result is multibyte text.
+   string returned with spaces to that value.  Return a Lisp string in
+   *STRING if the resulting string is taken from that Lisp string.
 
    Note we operate on the current buffer for most purposes,
    the exception being w->base_line_pos.  */
@@ -18276,11 +18281,11 @@ decode_mode_spec_coding (coding_system, buf, eol_flag)
 static char lots_of_dashes[] = "--------------------------------------------------------------------------------------------------------------------------------------------";
 
 static char *
-decode_mode_spec (w, c, field_width, precision, multibyte)
+decode_mode_spec (w, c, field_width, precision, string)
      struct window *w;
      register int c;
      int field_width, precision;
-     int *multibyte;
+     Lisp_Object *string;
 {
   Lisp_Object obj;
   struct frame *f = XFRAME (WINDOW_FRAME (w));
@@ -18288,7 +18293,7 @@ decode_mode_spec (w, c, field_width, precision, multibyte)
   struct buffer *b = current_buffer;
 
   obj = Qnil;
-  *multibyte = 0;
+  *string = Qnil;
 
   switch (c)
     {
@@ -18682,7 +18687,7 @@ decode_mode_spec (w, c, field_width, precision, multibyte)
 
   if (STRINGP (obj))
     {
-      *multibyte = STRING_MULTIBYTE (obj);
+      *string = obj;
       return (char *) SDATA (obj);
     }
   else
@@ -18803,7 +18808,10 @@ display_count_lines (start, start_byte, limit_byte, count, byte_pos_ptr)
 /* Display a NUL-terminated string, starting with index START.
 
    If STRING is non-null, display that C string.  Otherwise, the Lisp
-   string LISP_STRING is displayed.
+   string LISP_STRING is displayed.  There's a case that STRING is
+   non-null and LISP_STRING is not nil.  It means STRING is a string
+   data of LISP_STRING.  In that case, we display LISP_STRING while
+   ignoring its text properties.
 
    If FACE_STRING is not nil, FACE_STRING_POS is a position in
    FACE_STRING.  Display STRING or LISP_STRING with the face at
@@ -18853,8 +18861,12 @@ display_string (string, lisp_string, face_string, face_string_pos,
 
   /* Initialize the iterator IT for iteration over STRING beginning
      with index START.  */
-  reseat_to_string (it, string, lisp_string, start,
+  reseat_to_string (it, NILP (lisp_string) ? string : NULL, lisp_string, start,
 		    precision, field_width, multibyte);
+  if (string && STRINGP (lisp_string)) 
+    /* LISP_STRING is the one returned by decode_mode_spec.  We should
+       ignore its text properties.  */
+    it->stop_charpos = -1;
 
   /* If displaying STRING, set up the face of the iterator
      from LISP_STRING, if that's given.  */

src/xterm.c

@@ -1378,19 +1378,27 @@ x_draw_composite_glyph_string_foreground (s)
 	      if (j < i)
 		{
 		  font->driver->draw (s, j, i, x, y, 0);
+		  if (s->face->overstrike)
+		    font->driver->draw (s, j, i, x + 1, y, 0);
 		  x += width;
 		}
 	      xoff = LGLYPH_XOFF (glyph);
 	      yoff = LGLYPH_YOFF (glyph);
 	      wadjust = LGLYPH_WADJUST (glyph);
 	      font->driver->draw (s, i, i + 1, x + xoff, y + yoff, 0);
+	      if (s->face->overstrike)
+		font->driver->draw (s, i, i + 1, x + xoff + 1, y + yoff, 0);
 	      x += wadjust;
 	      j = i + 1;
 	      width = 0;
 	    }
 	}
       if (j < i)
-	font->driver->draw (s, j, i, x, y, 0);
+	{
+	  font->driver->draw (s, j, i, x, y, 0);
+	  if (s->face->overstrike)
+	    font->driver->draw (s, j, i, x + 1, y, 0);
+	}
     }
 }