(x_draw_glyph_string): Be sure to draw underline within the current

line area.

diff --git a/src/ChangeLog b/src/ChangeLog
index 3dd1a95..62ea887 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -4,7 +4,8 @@
        s->underline_thickness and s->underline_position.
 
        * xterm.c (x_draw_glyph_string): Be sure to update
-       s->underline_thickness and s->underline_position.
+       s->underline_thickness and s->underline_position.  Be sore to draw
+       underline within the current line area.
 
        * fontset.c: Delete unused variables and add casting for char *
        throughout the file.

diff --git a/src/xterm.c b/src/xterm.c
index b4c49d4..b268329 100644 (file)
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -2743,6 +2743,12 @@ x_draw_glyph_string (s)
                    position = (s->font->descent + 1) / 2;
                }
            }
+         /* Check the sanity of thickness and position.  We should
+            avoid drawing underline out of the current line area.  */
+         if (s->y + s->height <= s->ybase + position)
+           position = s->y + s->height - 1;
+         if (s->y + s->height < s->ybase + position + thickness)
+           thickness = (s->y + s->height) - (s->ybase + position);
          s->underline_thickness = thickness;
          s->underline_position = position;
          y = s->ybase + position;