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term: performance: use a bitfield to track which ascii printer to use

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The things affecting which ASCII printer we use have grown...

Instead of checking everything inside term_update_ascii_printer(), use
a bitfield.

Anything affecting the printer used, must now set a bit in this
bitfield. This makes term_update_ascii_printer() much faster, since
all it needs to do is check if the bitfield is zero or not.
This commit is contained in:
Daniel Eklöf 2024-06-24 01:26:57 +02:00
parent 22302d8bcc
commit 48cf57818d
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GPG key ID: 5BBD4992C116573F
5 changed files with 63 additions and 13 deletions
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12
vt.c
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@ -243,12 +243,16 @@ action_execute(struct terminal *term, uint8_t c)
case '\x0e':
/* SO - shift out */
term->charsets.selected = G1;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
case '\x0f':
/* SI - shift in */
term->charsets.selected = G0;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
@ -482,12 +486,16 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
case 'n':
/* LS2 - Locking Shift 2 */
term->charsets.selected = G2;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
case 'o':
/* LS3 - Locking Shift 3 */
term->charsets.selected = G3;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
@ -546,6 +554,8 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
size_t idx = term->vt.private - '(';
xassert(idx <= G3);
term->charsets.set[idx] = CHARSET_GRAPHIC;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
}
@ -554,6 +564,8 @@ action_esc_dispatch(struct terminal *term, uint8_t final)
size_t idx = term->vt.private - '(';
xassert(idx <= G3);
term->charsets.set[idx] = CHARSET_ASCII;
term->bits_affecting_ascii_printer.charset =
term->charsets.set[term->charsets.selected] != CHARSET_ASCII;
term_update_ascii_printer(term);
break;
}