From: NRK <nrk@disroot.org>
Date: Wed, 23 Mar 2022 20:04:04 +0000 (+0600)
Subject: significantly improve performance on large strings
X-Git-Url: https://git.xinqibao.xyz/dmenu.git/commitdiff_plain/7269c5355d257dd2ad2c53f15dc9c1cf6796aea5?ds=sidebyside;hp=7269c5355d257dd2ad2c53f15dc9c1cf6796aea5

significantly improve performance on large strings

this replaces inefficient pattern of `MIN(TEXTW(..), n)` with
drw_fontset_getwidth_clamp() instead, which is far more efficient when
we only want up to a certain width.

dumping a decently sized (unicode) emoji file into dmenu, I see the
startup time drop significantly with this patch.

before -> after
360ms  -> 160ms

this should also noticeably improve input latency (responsiveness) given
that calcoffsets() and drawmenu() are pretty hot functions.
---