Measure the single advance width with a heuristic method

This fix is needed to use dual-width fonts, which have double-width
glyphs (e.g. CJK unified ideographs).

Signed-off-by: Ryusei Yamaguchi <mandel59@gmail.com>
Signed-off-by: Christoph Lohmann <20h@r-36.net>

2 files changed, 15 insertions, 1 deletions

diff --git a/config.def.h b/config.def.h
index fd09d72..a1e7d5a 100644
--- a/config.def.h
+++ b/config.def.h
@@ -417,3 +417,11 @@ static uint selmasks[] = {
         [SEL_RECTANGULAR] = Mod1Mask,
 };
 
+/*
+ * Printable characters in ASCII, used to estimate the advance width
+ * of single wide characters.
+ */
+static char ascii_printable[] =
+        " !\"#$%&'()*+,-./0123456789:;<=>?"
+        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
+        "`abcdefghijklmnopqrstuvwxyz{|}~";
diff --git a/st.c b/st.c
index 2473af7..ca126d7 100644
--- a/st.c
+++ b/st.c
@@ -68,6 +68,7 @@ char *argv0;
 #define LEN(a)                  (sizeof(a) / sizeof(a)[0])
 #define DEFAULT(a, b)           (a) = (a) ? (a) : (b)
 #define BETWEEN(x, a, b)        ((a) <= (x) && (x) <= (b))
+#define DIVCEIL(n, d)           (((n) + ((d) - 1)) / (d))
 #define ISCONTROLC0(c)          (BETWEEN(c, 0, 0x1f) || (c) == '\177')
 #define ISCONTROLC1(c)          (BETWEEN(c, 0x80, 0x9f))
 #define ISCONTROL(c)            (ISCONTROLC0(c) || ISCONTROLC1(c))
@@ -3277,6 +3278,7 @@ xloadfont(Font *f, FcPattern *pattern)
 {
         FcPattern *match;
         FcResult result;
+        XGlyphInfo extents;
 
         match = FcFontMatch(NULL, pattern, &result);
         if (!match)
@@ -3287,6 +3289,10 @@ xloadfont(Font *f, FcPattern *pattern)
                 return 1;
         }
 
+        XftTextExtentsUtf8(xw.dpy, f->match,
+                (const FcChar8 *) ascii_printable,
+                LEN(ascii_printable), &extents);
+
         f->set = NULL;
         f->pattern = FcPatternDuplicate(pattern);
 
@@ -3296,7 +3302,7 @@ xloadfont(Font *f, FcPattern *pattern)
         f->rbearing = f->match->max_advance_width;
 
         f->height = f->ascent + f->descent;
-        f->width = f->lbearing + f->rbearing;
+        f->width = DIVCEIL(extents.xOff, LEN(ascii_printable));
 
         return 0;
 }