(Fontsets): Update the description.

doc/lispref/ChangeLog

+2009-03-13  Kenichi Handa  <handa@m17n.org>
+
+	* display.texi (Fontsets): Update the description.
+
 2009-03-13  Chong Yidong  <cyd@stupidchicken.com>
 
 	* advice.texi (Advising Primitives): Link to What Is a Function.

doc/lispref/display.texi

@@ -2883,32 +2883,48 @@ Then, the font specifications for all but Chinese GB2312 characters have
 Chinese GB2312 characters has a wild card @samp{*} in the @var{family}
 field.
 
-@defun set-fontset-font name character fontname &optional frame
-This function modifies the existing fontset @var{name} to
-use the font name @var{fontname} for the character @var{character}.
+@defun set-fontset-font name character font-spec &optional frame add
+This function modifies the existing fontset @var{name} to use the font
+matching with @var{font-spec} for the character @var{character}.
 
-If @var{name} is @code{nil}, this function modifies the default
+If @var{name} is @code{nil}, this function modifies the fontset of the
+selected frame or that of @var{frame} if @var{frame} is not
+@code{nil}.
+
+If @var{name} is @code{t}, this function modifies the default
 fontset, whose short name is @samp{fontset-default}.
 
 @var{character} may be a cons; @code{(@var{from} . @var{to})}, where
 @var{from} and @var{to} are character codepoints.  In that case, use
-@var{fontname} for all characters in the range @var{from} and @var{to}
+@var{font-spec} for all characters in the range @var{from} and @var{to}
 (inclusive).
 
 @var{character} may be a charset.  In that case, use
-@var{fontname} for all character in the charsets.
+@var{font-spec} for all character in the charsets.
+
+@var{character} may be a script anme.  In that case, use
+@var{font-spec} for all character in the charsets.
 
-@var{fontname} may be a cons; @code{(@var{family} . @var{registry})},
+@var{font-spec} may be a cons; @code{(@var{family} . @var{registry})},
 where @var{family} is a family name of a font (possibly including a
 foundry name at the head), @var{registry} is a registry name of a font
 (possibly including an encoding name at the tail).
 
+@var{font-spec} may be a font name string.
+
+The optional argument @var{add}, if non-@code{nil}, specifies how to
+add @var{font-spec} to the font specifications previously set.  If it
+is @code{prepend}, @var{font-spec} is prepended.  If it is
+@code{append}, @var{font-spec} is appended.  By default,
+@var{font-spec} overrides the previous settings.
+
 For instance, this changes the default fontset to use a font of which
-registry name is @samp{JISX0208.1983} for all characters belonging to
+family name is @samp{Kochi Gothic} for all characters belonging to
 the charset @code{japanese-jisx0208}.
 
 @smallexample
-(set-fontset-font nil 'japanese-jisx0208 '(nil . "JISX0208.1983"))
+(set-fontset-font t 'japanese-jisx0208
+                  (font-spec :family "Kochi Gothic"))
 @end smallexample
 @end defun