[hackers] [dmenu][patch] Improve speed of drw_text when provided with large strings

[m]

From: Miles Alan <m...@milesalan.com>

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);
-- 
2.30.2