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term: runtime switch between a ‘fast’ and a ‘generic’ ASCII print function

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term_print() is called whenever the client application “prints”
something to the grid. It is called for both ASCII and UTF-8
characters, and needs to handle sixels, insert mode and ASCII
vs. graphical charsets.

Since it’s on the hot path, this becomes unnecessarily slow.

This patch adds a “fast” version of term_print(), tailored for the
common case: ASCII characters in non-insert mode, without any sixels
and non-graphical charsets.

A new function, term_update_ascii_printer(), has been added, and must
be called whenever:

* The currently selected charset *index* changes
* The currently selected charset changes (from ASCII to graphical, or
  vice verse)
* Sixels are added to the grid
* Sixels are removed from the grid
* Insert mode is enabled/disabled
This commit is contained in:
Daniel Eklöf 2021-03-14 19:19:10 +01:00
parent d8f0e701b5
commit 60b3ccc641
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
5 changed files with 84 additions and 16 deletions
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7
sixel.c
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@ -331,6 +331,7 @@ sixel_scroll_up(struct terminal *term, int rows)
}
}
term_update_ascii_printer(term);
verify_sixels(term);
}
@ -353,6 +354,7 @@ sixel_scroll_down(struct terminal *term, int rows)
break;
}
term_update_ascii_printer(term);
verify_sixels(term);
}
@ -552,6 +554,8 @@ sixel_overwrite_by_rectangle(
_sixel_overwrite_by_rectangle(term, 0, col, height - rows_to_wrap_around, width);
} else
_sixel_overwrite_by_rectangle(term, start, col, height, width);
term_update_ascii_printer(term);
}
/* Row numbers are relative to grid offset */
@ -605,6 +609,8 @@ sixel_overwrite_by_row(struct terminal *term, int _row, int col, int width)
}
}
}
term_update_ascii_printer(term);
}
void
@ -859,6 +865,7 @@ sixel_unhook(struct terminal *term)
LOG_DBG("you now have %zu sixels in current grid",
tll_length(term->grid->sixel_images));
term_update_ascii_printer(term);
render_refresh(term);
}