Cache last merged escape glyph face.

(last_escape_glyph_frame, last_escape_glyph_face_id)
(last_escape_glyph_merged_face_id): New variables.
(get_next_display_element): Use/update them.
(redisplay_internal): Reset them before redisplay.

(set_iterator_to_next): Optimize 2004-12-13 fix.
Only recheck faces after displaying ellipsis.

1 files changed, 27 insertions, 2 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 0a038ea7e63..b25bebe3857 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -5329,6 +5329,10 @@ static int (* get_next_element[NUM_IT_METHODS]) P_ ((struct it *it)) =
    display element from the current position of IT.  Value is zero if
    end of buffer (or C string) is reached.  */
 
+static struct frame *last_escape_glyph_frame = NULL;
+static unsigned last_escape_glyph_face_id = (1 << FACE_ID_BITS);
+static int last_escape_glyph_merged_face_id = 0;
+
 int
 get_next_display_element (it)
      struct it *it;
@@ -5445,11 +5449,19 @@ get_next_display_element (it)
                        face_id = merge_faces (it->f, Qt, lface_id,
                                               it->face_id);
                     }
+                  else if (it->f == last_escape_glyph_frame
+                           && it->face_id == last_escape_glyph_face_id)
+                    {
+                      face_id = last_escape_glyph_merged_face_id;
+                    }
                   else
                     {
                       /* Merge the escape-glyph face into the current face.  */
                       face_id = merge_faces (it->f, Qescape_glyph, 0,
                                              it->face_id);
+                      last_escape_glyph_frame = it->f;
+                      last_escape_glyph_face_id = it->face_id;
+                      last_escape_glyph_merged_face_id = face_id;
                     }
 
                   XSETINT (it->ctl_chars[0], g);
@@ -5496,11 +5508,19 @@ get_next_display_element (it)
                   face_id = merge_faces (it->f, Qt, lface_id,
                                          it->face_id);
                 }
+              else if (it->f == last_escape_glyph_frame
+                       && it->face_id == last_escape_glyph_face_id)
+                {
+                  face_id = last_escape_glyph_merged_face_id;
+                }
               else
                 {
                   /* Merge the escape-glyph face into the current face.  */
                   face_id = merge_faces (it->f, Qescape_glyph, 0,
                                          it->face_id);
+                  last_escape_glyph_frame = it->f;
+                  last_escape_glyph_face_id = it->face_id;
+                  last_escape_glyph_merged_face_id = face_id;
                 }
 
               /* Handle soft hyphens in the mode where they only get
@@ -5694,6 +5714,8 @@ set_iterator_to_next (it, reseat_p)
 
       if (it->dpvec + it->current.dpvec_index == it->dpend)
         {
+          int recheck_faces = it->ellipsis_p;
+
           if (it->s)
             it->method = GET_FROM_C_STRING;
           else if (STRINGP (it->string))
@@ -5716,8 +5738,9 @@ set_iterator_to_next (it, reseat_p)
               set_iterator_to_next (it, reseat_p);
             }
 
-          /* Recheck faces after display vector */
-          it->stop_charpos = IT_CHARPOS (*it);
+          /* Maybe recheck faces after display vector */
+          if (recheck_faces)
+            it->stop_charpos = IT_CHARPOS (*it);
         }
       break;
 
@@ -10545,6 +10568,8 @@ redisplay_internal (preserve_echo_area)
  retry:
   pause = 0;
   reconsider_clip_changes (w, current_buffer);
+  last_escape_glyph_frame = NULL;
+  last_escape_glyph_face_id = (1 << FACE_ID_BITS);
 
   /* If new fonts have been loaded that make a glyph matrix adjustment
      necessary, do it.  */