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csi: implement DECOM - switch cursor origin between absolute and relative

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The default is absolute mode, where 0,0 is the upper left corner of
the screen.

In relative mode, the origin is relative the top scroll margin.

Internally, we always track the current cursor position in absolute
mode. Every time we the client *sets* or *queries* the cursor position
in relative mode, we translate it to absolute.
This commit is contained in:
Daniel Eklöf 2019-11-05 13:27:37 +01:00
parent 89dbc61a34
commit 95eaad7ce4
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GPG key ID: 5BBD4992C116573F
3 changed files with 64 additions and 14 deletions
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32
terminal.c
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@ -486,6 +486,7 @@ term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
},
.alpha = conf->colors.alpha,
},
.origin = ORIGIN_ABSOLUTE,
.default_cursor_style = conf->cursor.style,
.cursor_style = conf->cursor.style,
.default_cursor_color = {
@ -991,6 +992,30 @@ 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)
{
switch (term->origin) {
case ORIGIN_ABSOLUTE:
return (struct coord) {
.col = min(col, term->cols - 1),
.row = min(row, term->rows - 1),
};
break;
case ORIGIN_RELATIVE: {
return (struct coord) {
.col = min(col, term->cols - 1),
.row = min(row + term->scroll_region.start, term->rows - 1),
};
break;
}
}
assert(false);
return (struct coord){-1, -1};
}
void
term_cursor_to(struct terminal *term, int row, int col)
{
@ -1005,6 +1030,13 @@ term_cursor_to(struct terminal *term, int row, int col)
term->grid->cur_row = grid_row(term->grid, row);
}
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);
}
void
term_cursor_left(struct terminal *term, int count)
{