dwm

commit b51d258b0a546b46c04b44fc89a3bf6f5c7d761d
parent 067346ba014c68637f44ea9bfc66a50e89d3fa20
Author: Miles Alan <m@milesalan.com>
Date:   Mon,  9 Aug 2021 18:24:14 +0200

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.

Diffstat:
M
drw.c
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git 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);