commit 7ab0cb5ef0e19352fc5d64ae0d57a5cf4540acbf
Author: NRK <[email protected]>
AuthorDate: Fri Jul 7 17:00:42 2023 +0600
Commit: Hiltjo Posthuma <[email protected]>
CommitDate: Fri Jul 7 15:03:57 2023 +0200
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.
diff --git a/dmenu.c b/dmenu.c
index 62f1089..40f93e0 100644
--- 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
index a58a2b4..78a2b27 100644
--- 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
index f633b51..c0a50d4 100644
--- 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);
