Fast-path isolated single ASCII cell printing in term_feed_inner

1 files changed, 13 insertions, 0 deletions

diff --git a/src/text.c b/src/text.c
index 88b23a5..c72ea26 100644
--- a/src/text.c
+++ b/src/text.c
@@ -240,6 +240,19 @@ static void term_feed_inner(struct term *t, const char *buf, size_t len, unsigne
                     }
                 }
             }
+            if (run == 1) {
+                if (i + 1 < len && (unsigned char)buf[i + 1] >= 0xc2 &&
+                    (unsigned char)buf[i + 1] <= 0xf4 &&
+                    (i + 2 == len || ((unsigned char)buf[i + 2] & 0xc0) == 0x80)) {
+                    uint32_t next_cp;
+                    if (utf8_decode_one(buf + i + 1, len - i - 1, &next_cp) &&
+                        term_text_class(next_cp) > 0 &&
+                        try_text_run(t, buf, len, &i))
+                        continue;
+                }
+                sc_print_cell(t, ch, 1, cur_flags);
+                continue;
+            }
             if (i + (size_t)run < len && (unsigned char)buf[i + run] >= 0x80) {
                 uint32_t next_cp;
                 if (utf8_decode_one(buf + i + run, len - i - (size_t)run, &next_cp) &&