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term: "cache" pointer to current line

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This adds a pointer to the first cell on the current line. This
pointer must be updated every time the row changes.

The advantage is mainly that PRINT doesn't have to call
grid_get_range(), which is fairly expensive.
This commit is contained in:
Daniel Eklöf 2019-07-02 22:18:25 +02:00
parent ed68eafdf0
commit 9682e15deb
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3 changed files with 14 additions and 5 deletions
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12
terminal.c
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@ -169,6 +169,12 @@ term_cursor_to(struct terminal *term, int row, int col)
term->cursor.linear = new_linear;
term->cursor.col = col;
term->cursor.row = row;
size_t len = term->cols;
term->grid->cur_line = grid_get_range(
term->grid, term->cursor.linear - col, &len);
assert(len == (size_t)term->cols);
}
void
@ -253,6 +259,12 @@ term_scroll_partial(struct terminal *term, struct scroll_region region, int rows
max(0, region.end - rows) * term->cols, 0, rows * term->cols);
term_damage_scroll(term, DAMAGE_SCROLL, region, rows);
size_t len = term->cols;
term->grid->cur_line = grid_get_range(
term->grid, term->cursor.linear - term->cursor.col, &len);
assert(len == (size_t)term->cols);
}
void