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Measure the single advance width with a heuristic method

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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>
This commit is contained in:
Ryusei Yamaguchi 2016-03-08 12:26:04 +09:00 committed by Christoph Lohmann
parent 30440295bc
commit 034a5c8a09
2 changed files with 15 additions and 1 deletions
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8
config.def.h
View file

@ -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{|}~";

8
st.c
View file

@ -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;
}