dmenu

My custom build of dmenu.
git clone https://git.mtkn.jp/dmenu
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commit 7ab0cb5ef0e19352fc5d64ae0d57a5cf4540acbf
parent 0fe460dbd469a1d5b6a7140d0e1801935e4a923b
Author: NRK <nrk@disroot.org>
Date:   Fri,  7 Jul 2023 17:00:42 +0600

drw: minor improvement to the nomatches cache

1. use `unsigned int` to store the codepoints, this avoids waste on
   common case where `long` is 64bits. and POSIX guarantees `int` to be
   at least 32bits so there's no risk of truncation.
2. since switching to `unsigned int` cuts down the memory requirement by
   half, double the cache size from 64 to 128.
3. instead of a linear search, use a simple hash-table for O(1) lookups.

Diffstat:
Mdmenu.c | 1-
Mdrw.c | 23++++++++++++-----------
Mutil.h | 1+
3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/dmenu.c b/dmenu.c @@ -22,7 +22,6 @@ /* macros */ #define INTERSECT(x,y,w,h,r) (MAX(0, MIN((x)+(w),(r).x_org+(r).width) - MAX((x),(r).x_org)) \ * MAX(0, MIN((y)+(h),(r).y_org+(r).height) - MAX((y),(r).y_org))) -#define LENGTH(X) (sizeof X / sizeof X[0]) #define TEXTW(X) (drw_fontset_getwidth(drw, (X)) + lrpad) /* enums */ diff --git a/drw.c b/drw.c @@ -238,8 +238,8 @@ drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert) { - int i, ty, ellipsis_x = 0; - unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len; + int ty, ellipsis_x = 0; + unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1; XftDraw *d = NULL; Fnt *usedfont, *curfont, *nextfont; int utf8strlen, utf8charlen, render = x || y || w || h; @@ -251,9 +251,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp XftResult result; int charexists = 0, overflow = 0; /* keep track of a couple codepoints for which we have no match. */ - enum { nomatches_len = 64 }; - static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches; - static unsigned int ellipsis_width = 0; + static unsigned int nomatches[128], ellipsis_width; if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts) return 0; @@ -338,11 +336,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp * character must be drawn. */ charexists = 1; - for (i = 0; i < nomatches_len; ++i) { - /* avoid calling XftFontMatch if we know we won't find a match */ - if (utf8codepoint == nomatches.codepoint[i]) - goto no_match; - } + hash = (unsigned int)utf8codepoint; + hash = ((hash >> 16) ^ hash) * 0x21F0AAAD; + hash = ((hash >> 15) ^ hash) * 0xD35A2D97; + h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches); + h1 = (hash >> 17) % LENGTH(nomatches); + /* avoid expensive XftFontMatch call when we know we won't find a match */ + if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint) + goto no_match; fccharset = FcCharSetCreate(); FcCharSetAddChar(fccharset, utf8codepoint); @@ -371,7 +372,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp curfont->next = usedfont; } else { xfont_free(usedfont); - nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint; + nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint; no_match: usedfont = drw->fonts; } diff --git a/util.h b/util.h @@ -3,6 +3,7 @@ #define MAX(A, B) ((A) > (B) ? (A) : (B)) #define MIN(A, B) ((A) < (B) ? (A) : (B)) #define BETWEEN(X, A, B) ((A) <= (X) && (X) <= (B)) +#define LENGTH(X) (sizeof (X) / sizeof (X)[0]) void die(const char *fmt, ...); void *ecalloc(size_t nmemb, size_t size);