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term: cache currently selected charset

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vt.c::action_print(), which is in the hot path, needs to lookup the
currently selected charset.

This currently requires two loads; first to load the current
charset *index*, and then another to get _which_ charset is currently
mapped to that index.

By caching the current charset, we only need one load.

We need to update the cache when:

* A different charset index is selected (i.e. SO/SI)
* The charset for the current index is changed (e.g. ‘\E(0’, ‘\E(B’
  etc)
* We restore saved charsets
This commit is contained in:
Daniel Eklöf 2021-03-14 14:32:00 +01:00
parent c5c3447ca8
commit aa8902a6ef
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GPG key ID: 5BBD4992C116573F
3 changed files with 12 additions and 6 deletions
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16
vt.c
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@ -184,11 +184,13 @@ action_execute(struct terminal *term, uint8_t c)
case '\x0e':
/* SO - shift out */
term->charsets.selected = 1; /* G1 */
term->charset = term->charsets.set[1];
break;
case '\x0f':
/* SI - shift in */
term->charsets.selected = 0; /* G0 */
term->charset = term->charsets.set[0];
break;
/*
@ -238,13 +240,10 @@ action_print(struct terminal *term, uint8_t c)
L'│', L'≤', L'≥', L'π', L'≠', L'£', L'·', /* x - ~ */
};
if (unlikely(term->charsets.set[term->charsets.selected] == CHARSET_GRAPHIC) &&
c >= 0x60 && c <= 0x7e)
{
if (unlikely(term->charset == CHARSET_GRAPHIC) && c >= 0x60 && c <= 0x7e)
term_print(term, vt100_0[c - 0x60], 1);
} else {
else
term_print(term, c, 1);
}
}
static void
@ -414,11 +413,13 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
case 'N':
/* SS2 - Single Shift 2 */
term->charsets.selected = 2; /* G2 */
term->charset = term->charsets.set[2];
break;
case 'O':
/* SS3 - Single Shift 3 */
term->charsets.selected = 3; /* G3 */
term->charset = term->charsets.set[3];
break;
case '\\':
@ -453,6 +454,8 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
'+' ? 3 : -1;
xassert(idx != -1);
term->charsets.set[idx] = CHARSET_GRAPHIC;
if (idx == term->charsets.selected)
term->charset = CHARSET_GRAPHIC;
break;
}
@ -465,7 +468,8 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
'+' ? 3 : -1;
xassert(idx != -1);
term->charsets.set[idx] = CHARSET_ASCII;
if (idx == term->charsets.selected)
term->charset = CHARSET_ASCII;
break;
}
}