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>

diff --git a/config.def.h b/config.def.h
index fd09d72b7cde7e477b66a08ce0a40175ff72f288..a1e7d5a9cc9b4338a211e9031a3e64cb4c9c49a4 100644 (file)
--- 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 2473af7b44b01fcb7d62d45f7b1ce749c7bf4c52..ca126d7448962d2a4bd175715aa6a184c0522341 100644 (file)
--- 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;
 }