[Emacs-diffs] emacs/src fontset.c [EMACS_23_1_RC]

[Kenichi Handa]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Branch:         EMACS_23_1_RC
Changes by:     Kenichi Handa <handa>   09/07/03 02:10:39

Modified files:
        src            : fontset.c 

Log message:
        (fontset_find_font): Re-order a fallback font-group.
        (fontset_font): Treat return value t of fontset_find_font as a
        sign of no-font in that fontset, not as a sign of no-font
        anywhere.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/emacs/src/fontset.c?cvsroot=emacs&only_with_tag=EMACS_23_1_RC&r1=1.173&r2=1.173.2.1

Patches:
Index: fontset.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/fontset.c,v
retrieving revision 1.173
retrieving revision 1.173.2.1
diff -u -b -r1.173 -r1.173.2.1
--- fontset.c   8 Jun 2009 04:33:40 -0000       1.173
+++ fontset.c   3 Jul 2009 02:10:38 -0000       1.173.2.1
@@ -525,6 +525,8 @@
 {
   Lisp_Object vec, font_group;
   int i, charset_matched = -1;
+  Lisp_Object rfont_def;
+  int found_index;
   FRAME_PTR f = (FRAMEP (FONTSET_FRAME (fontset)))
     ? XFRAME (selected_frame) : XFRAME (FONTSET_FRAME (fontset));
 
@@ -564,21 +566,22 @@
   /* Find the first available font in the vector of RFONT-DEF.  */
   for (i = 0; i < ASIZE (vec); i++)
     {
-      Lisp_Object rfont_def, font_def;
+      Lisp_Object font_def;
       Lisp_Object font_entity, font_object;
 
       if (i == 0 && charset_matched >= 0)
        {
          /* Try the element matching with the charset ID at first.  */
-         rfont_def = AREF (vec, charset_matched);
+         found_index = charset_matched;
          charset_matched = -1;
          i--;
        }
       else if (i != charset_matched)
-       rfont_def = AREF (vec, i);
+       found_index = i;
       else
        continue;
 
+      rfont_def = AREF (vec, found_index);
       if (NILP (rfont_def))
        /* This is a sign of not to try the other fonts.  */
        return Qt;
@@ -623,7 +626,7 @@
        }
 
       if (font_has_char (f, font_object, c))
-       return rfont_def;
+       goto found;
 
       /* Find a font already opened, maching with the current spec,
         and supporting C. */
@@ -637,7 +640,7 @@
            break;
          font_object = RFONT_DEF_OBJECT (AREF (vec, i));
          if (! NILP (font_object) && font_has_char (f, font_object, c))
-           return rfont_def;
+           goto found;
        }
 
       /* Find a font-entity with the current spec and supporting C.  */
@@ -661,10 +664,12 @@
          for (j = 0; j < i; j++)
            ASET (new_vec, j, AREF (vec, j));
          ASET (new_vec, j, rfont_def);
+         found_index = j;
          for (j++; j < ASIZE (new_vec); j++)
            ASET (new_vec, j, AREF (vec, j - 1));
          XSETCDR (font_group, new_vec);
-         return rfont_def;
+         vec = new_vec;
+         goto found;
        }
 
       /* No font of the current spec for C.  Try the next spec.  */
@@ -673,6 +678,20 @@
 
   FONTSET_SET (fontset, make_number (c), make_number (0));
   return Qnil;
+
+ found:
+  if (fallback && found_index > 0)
+    {
+      /* The order of fonts in the fallback font-group is not that
+        important, and it is better to move the found font to the
+        first of the group so that the next try will find it
+        quickly. */
+      for (i = found_index; i > 0; i--)
+       ASET (vec, i, AREF (vec, i - 1));
+      ASET (vec, 0, rfont_def);
+      found_index = 0;
+    }
+  return rfont_def;
 }
 
 
@@ -685,13 +704,14 @@
 {
   Lisp_Object rfont_def;
   Lisp_Object base_fontset;
+  int try_fallback = 0, try_default_fallback = 0;
 
   /* Try a font-group of FONTSET. */
   rfont_def = fontset_find_font (fontset, c, face, id, 0);
   if (VECTORP (rfont_def))
     return rfont_def;
-  if (EQ (rfont_def, Qt))
-    goto no_font;
+  if (! EQ (rfont_def, Qt))
+    try_fallback = 1;
 
   /* Try a font-group of the default fontset. */
   base_fontset = FONTSET_BASE (fontset);
@@ -703,29 +723,30 @@
       rfont_def = fontset_find_font (FONTSET_DEFAULT (fontset), c, face, id, 
0);
       if (VECTORP (rfont_def))
        return rfont_def;
-      if (EQ (rfont_def, Qt))
-       goto no_font;
+      if (! EQ (rfont_def, Qt))
+       try_default_fallback = 1;
     }
 
   /* Try a fallback font-group of FONTSET. */
+  if (try_fallback)
+    {
   rfont_def = fontset_find_font (fontset, c, face, id, 1);
   if (VECTORP (rfont_def))
     return rfont_def;
-  if (EQ (rfont_def, Qt))
-    goto no_font;
+      /* Remember that FONTSET has no font for C.  */
+      FONTSET_SET (fontset, make_number (c), Qt);
+    }
 
   /* Try a fallback font-group of the default fontset . */
-  if (! EQ (base_fontset, Vdefault_fontset))
+  if (try_default_fallback)
     {
       rfont_def = fontset_find_font (FONTSET_DEFAULT (fontset), c, face, id, 
1);
       if (VECTORP (rfont_def))
        return rfont_def;
+      /* Remember that the default fontset has no font for C.  */
+      FONTSET_SET (FONTSET_DEFAULT (fontset), make_number (c), Qt);
     }
 
- no_font:
-  /* Remember that we have no font for C.  */
-  FONTSET_SET (fontset, make_number (c), Qt);
-
   return Qnil;
 }