(w32_native_per_char_metric): Don't trust the metrics

that Windows returns.  If a double check fails, try to guess how
ExtTextOut is going to act.

diff --git a/src/w32term.c b/src/w32term.c
index af83ae53a2a306bf1ac0999112a3836dd83c2922..e25a270fc1d42fbeaca835a99c30e253abbe7e8f 100644 (file)
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -388,8 +388,8 @@ static void x_clear_frame P_ ((void));
 static void x_clear_cursor P_ ((struct window *));
 static void frame_highlight P_ ((struct frame *));
 static void frame_unhighlight P_ ((struct frame *));
-static void w32_new_focus_frame P_ ((struct w32_display_info *,
-                                     struct frame *));
+static void x_new_focus_frame P_ ((struct w32_display_info *,
+                                  struct frame *));
 static void w32_frame_rehighlight P_ ((struct frame *));
 static void x_frame_rehighlight P_ ((struct w32_display_info *));
 static void x_draw_hollow_cursor P_ ((struct window *, struct glyph_row *));
@@ -1210,9 +1210,20 @@ w32_native_per_char_metric (font, char2b, font_type, pcm)
 
       if (retval)
        {
+         /* Don't trust the ABC widths.  For synthesized fonts they are
+            wrong, and so is the result of GetCharWidth()!  */
+         int real_width;
+         GetCharWidth (hdc, *char2b, *char2b, &real_width);
+
          pcm->width = char_widths.abcA + char_widths.abcB + char_widths.abcC;
+
+         /* As far as I can tell, this is the best way to determine what
+            ExtTextOut will do with the broken font.  */
+         if (pcm->width != real_width)
+           pcm->width = (pcm->width + real_width) / 2;
+
          pcm->lbearing = char_widths.abcA;
-         pcm->rbearing = pcm->width - char_widths.abcC;
+         pcm->rbearing = char_widths.abcA + char_widths.abcB;
          pcm->ascent = FONT_BASE (font);
          pcm->descent = FONT_DESCENT (font);
        }