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dmenu
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inputw: improve correctness and startup performance 

a massive amount of time inside readstdin() is spent trying to get the
max input width and then put it into inputw, only for it to get clamped
down to mw/3 inside setup().

it makes more sense to calculate inputw inside setup() once we have mw
available. similar to the last patch, i see noticeable startup
performance improvement:

before -> after
160ms  -> 60ms

additionally this will take fallback fonts into account compared to the
previous version, so it's not only more performant but also more correct.
This commit is contained in:
NRK 2022-03-24 00:37:55 +06:00 committed by Hiltjo Posthuma
parent 7269c5355d
commit 77526f756e
1 changed files with 9 additions and 10 deletions
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19
dmenu.c
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@ -547,8 +547,7 @@ static void
readstdin(void)
{
char buf[sizeof text], *p;
size_t i, imax = 0, size = 0;
unsigned int tmpmax = 0;
size_t i, size = 0;
/* read each line from stdin and add it to the item list */
for (i = 0; fgets(buf, sizeof buf, stdin); i++) {
@ -560,15 +559,9 @@ readstdin(void)
if (!(items[i].text = strdup(buf)))
die("cannot strdup %u bytes:", strlen(buf) + 1);
items[i].out = 0;
drw_font_getexts(drw->fonts, buf, strlen(buf), &tmpmax, NULL);
if (tmpmax > inputw) {
inputw = tmpmax;
imax = i;
}
}
if (items)
items[i].text = NULL;
inputw = items ? TEXTW(items[imax].text) : 0;
lines = MIN(lines, i);
}
@ -614,12 +607,13 @@ static void
setup(void)
{
int x, y, i, j;
unsigned int du;
unsigned int du, tmp;
XSetWindowAttributes swa;
XIM xim;
Window w, dw, *dws;
XWindowAttributes wa;
XClassHint ch = {"dmenu", "dmenu"};
struct item *item;
#ifdef XINERAMA
XineramaScreenInfo *info;
Window pw;
@ -677,7 +671,12 @@ setup(void)
mw = wa.width;
}
promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
inputw = MIN(inputw, mw/3);
for (item = items; item && item->text; ++item) {
if ((tmp = textw_clamp(item->text, mw/3)) > inputw) {
if ((inputw = tmp) == mw/3)
break;
}
}
match();
/* create menu window */