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commit 716233534b35f74dba5a46ade8f1a6f8cc72fea4
parent 138b405f0c8aa24d8a040cc1a1cf6e3eb5a0ebc7
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);