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term: try to improve on a performance regression

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When support was added for DECOM (absolute/relative row addressing), a
small but noticeable (~3.5%) performance regression was introduced.

Try to improve the situation by simplifying the relative-to-absolute
conversion; only the row needs to be transformed.
This commit is contained in:
Daniel Eklöf 2019-11-17 18:52:27 +01:00
parent cf75528e86
commit 9902a5732f
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GPG key ID: 5BBD4992C116573F
3 changed files with 17 additions and 29 deletions
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24
terminal.c
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@ -995,28 +995,19 @@ term_erase(struct terminal *term, const struct coord *start, const struct coord
erase_cell_range(term, grid_row(term->grid, end->row), 0, end->col);
}
struct coord
term_cursor_rel_to_abs(const struct terminal *term, int row, int col)
int
term_row_rel_to_abs(const struct terminal *term, int row)
{
switch (term->origin) {
case ORIGIN_ABSOLUTE:
return (struct coord) {
.col = min(col, term->cols - 1),
.row = min(row, term->rows - 1),
};
break;
return min(row, term->rows - 1);
case ORIGIN_RELATIVE: {
return (struct coord) {
.col = min(col, term->cols - 1),
.row = min(row + term->scroll_region.start, term->rows - 1),
};
break;
}
case ORIGIN_RELATIVE:
return min(row + term->scroll_region.start, term->scroll_region.end - 1);
}
assert(false);
return (struct coord){-1, -1};
return -1;
}
void
@ -1036,8 +1027,7 @@ term_cursor_to(struct terminal *term, int row, int col)
void
term_cursor_home(struct terminal *term)
{
struct coord new_cursor = term_cursor_rel_to_abs(term, 0, 0);
term_cursor_to(term, new_cursor.row, new_cursor.col);
term_cursor_to(term, term_row_rel_to_abs(term, 0), 0);
}
void