/* Delete ny lines. */
void
screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper || s->cy > s->rlower) {
if (ny > screen_size_y(s) - s->cy)
ny = screen_size_y(s) - s->cy;
if (ny == 0)
return;
screen_write_flush(ctx);
screen_write_initctx(ctx, &ttyctx);
grid_view_delete_lines(s->grid, s->cy, ny, bg);
ttyctx.num = ny;
ttyctx.bg = bg;
tty_write(tty_cmd_deleteline, &ttyctx);
return;
}
if (ny > s->rlower + 1 - s->cy)
ny = s->rlower + 1 - s->cy;
if (ny == 0)
return;
screen_write_flush(ctx);
screen_write_initctx(ctx, &ttyctx);
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_delete_lines(s->grid, s->cy, ny, bg);
else {
grid_view_delete_lines_region(s->grid, s->rlower, s->cy, ny,
bg);
}
ttyctx.num = ny;
ttyctx.bg = bg;
tty_write(tty_cmd_deleteline, &ttyctx);
}
void
screen_resize_y(struct screen *s, u_int sy)
{
struct grid *gd = s->grid;
u_int needed, available, oldy, i;
if (sy == 0)
fatalx("zero size");
oldy = screen_size_y(s);
/*
* When resizing:
*
* If the height is decreasing, delete lines from the bottom until
* hitting the cursor, then push lines from the top into the history.
*
* When increasing, pull as many lines as possible from the history to
* the top, then fill the remaining with blanks at the bottom.
*/
/* Size decreasing. */
if (sy < oldy) {
needed = oldy - sy;
/* Delete as many lines as possible from the bottom. */
available = oldy - 1 - s->cy;
if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, oldy - available, available);
}
needed -= available;
/*
* Now just increase the history size, if possible, to take
* over the lines which are left. If history is off, delete
* lines from the top.
*/
available = s->cy;
if (gd->flags & GRID_HISTORY)
gd->hsize += needed;
else if (needed > 0 && available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, 0, available);
}
s->cy -= needed;
}
/* Resize line arrays. */
gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
sizeof *gd->linedata);
/* Size increasing. */
if (sy > oldy) {
needed = sy - oldy;
/*
* Try to pull as much as possible out of the history, if is
* is enabled.
*/
available = gd->hsize;
if (gd->flags & GRID_HISTORY && available > 0) {
if (available > needed)
available = needed;
gd->hsize -= available;
s->cy += available;
} else
available = 0;
needed -= available;
/* Then fill the rest in with blanks. */
for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
}
/* Set the new size, and reset the scroll region. */
gd->sy = sy;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
}
