From c585e8e498ec6f9c423ab8ea07cf853ee5b05fbe Mon Sep 17 00:00:00 2001
From: Miles Alan <m@milesalan.com>
Date: Sat, 7 Aug 2021 21:34:35 -0400
Subject: [PATCH] Improve speed of drw_text when provided with large strings
Calculates len & ew in drw_font_getexts loop by incrementing instead of
decrementing; as such avoids proportional increase in time spent in loop
based on provided strings size.
---
drw.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drw.c b/drw.c
index 4cdbcbe..9c39086 100644
--- a/drw.c
+++ b/drw.c
@@ -310,8 +310,11 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
if (utf8strlen) {
drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
/* shorten text if necessary */
- for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
- drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
+ if (ew > w)
+ for (ew = 0, len = 0; ew < w - lpad * 2 && len < MIN(utf8strlen, sizeof(buf) - 1); len++)
+ drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
+ else
+ len = MIN(utf8strlen, sizeof(buf) - 1);
if (len) {
memcpy(buf, utf8str, len);