From: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Sat, 9 May 2020 12:03:14 +0000 (+0200)
Subject: optimize column width calculation and utf-8 encode for ASCII
X-Git-Url: https://git.danieliu.xyz/?p=st.git;a=commitdiff_plain;h=cde480c6939e62771ba3b60ef4eb848031aee9f9

optimize column width calculation and utf-8 encode for ASCII

In particular on OpenBSD and on glibc wcwidth() is quite expensive.
On musl there is little difference.
---

diff --git a/st.c b/st.c
index 5d4054f..1414f98 100644
--- a/st.c
+++ b/st.c
@@ -2307,7 +2307,7 @@ tputc(Rune u)
 	Glyph *gp;
 
 	control = ISCONTROL(u);
-	if (!IS_SET(MODE_UTF8 | MODE_SIXEL)) {
+	if (u < 127 || !IS_SET(MODE_UTF8 | MODE_SIXEL)) {
 		c[0] = u;
 		width = len = 1;
 	} else {