(overline_margin): New variable.

(x_produce_glyphs): Use it.
(syms_of_xdisp): DEFVAR_INT it.

diff --git a/src/xdisp.c b/src/xdisp.c
index 640f7006dd14dfe2fa27325a2f15b503410da156..4144cf51f6ae7ad3127164b90a40bbfdf78a07f4 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -710,6 +710,10 @@ Lisp_Object Vresize_mini_windows;
 
 struct buffer *displayed_buffer;
 
+/* Space between overline and text. */
+
+EMACS_INT overline_margin;
+
 /* Value returned from text property handlers (see below).  */
 
 enum prop_handled
@@ -20357,7 +20361,7 @@ x_produce_glyphs (it)
          /* If face has an overline, add the height of the overline
             (1 pixel) and a 1 pixel margin to the character height.  */
          if (face->overline_p)
-           it->ascent += 2;
+           it->ascent += overline_margin;
 
          if (it->constrain_row_ascent_descent_p)
            {
@@ -20559,7 +20563,7 @@ x_produce_glyphs (it)
          /* If face has an overline, add the height of the overline
             (1 pixel) and a 1 pixel margin to the character height.  */
          if (face->overline_p)
-           it->ascent += 2;
+           it->ascent += overline_margin;
 
          take_vertical_position_into_account (it);
 
@@ -20834,7 +20838,7 @@ x_produce_glyphs (it)
       /* If face has an overline, add the height of the overline
         (1 pixel) and a 1 pixel margin to the character height.  */
       if (face->overline_p)
-       it->ascent += 2;
+       it->ascent += overline_margin;
 
       take_vertical_position_into_account (it);
 
@@ -24110,6 +24114,12 @@ whose contents depend on various data.  */);
               doc: /* Inhibit try_cursor_movement display optimization.  */);
   inhibit_try_cursor_movement = 0;
 #endif /* GLYPH_DEBUG */
+
+  DEFVAR_INT ("overline-margin", &overline_margin,
+              doc: /* *Space between overline and text, in pixels.
+The default value is 2: the height of the overline (1 pixel) plus 1 pixel
+margin to the caracter height.  */);
+  overline_margin = 2;
 }