/* Scroll a region up, moving the top line into the history. */
void
grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower, u_int bg)
{
struct grid_line *gl_history, *gl_upper;
u_int yy;
/* Create a space for a new line. */
yy = gd->hsize + gd->sy;
gd->linedata = xreallocarray(gd->linedata, yy + 1,
sizeof *gd->linedata);
/* Move the entire screen down to free a space for this line. */
gl_history = &gd->linedata[gd->hsize];
memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);
/* Adjust the region and find its start and end. */
upper++;
gl_upper = &gd->linedata[upper];
lower++;
/* Move the line into the history. */
memcpy(gl_history, gl_upper, sizeof *gl_history);
/* Then move the region up and clear the bottom line. */
memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
grid_empty_line(gd, lower, bg);
/* Move the history offset down over the line. */
gd->hscrolled++;
gd->hsize++;
}
/* Move a group of lines. */
void
grid_move_lines(struct grid *gd, u_int dy, u_int py, u_int ny, u_int bg)
{
u_int yy;
if (ny == 0 || py == dy)
return;
if (grid_check_y(gd, py) != 0)
return;
if (grid_check_y(gd, py + ny - 1) != 0)
return;
if (grid_check_y(gd, dy) != 0)
return;
if (grid_check_y(gd, dy + ny - 1) != 0)
return;
/* Free any lines which are being replaced. */
for (yy = dy; yy < dy + ny; yy++) {
if (yy >= py && yy < py + ny)
continue;
grid_clear_lines(gd, yy, 1, bg);
}
memmove(&gd->linedata[dy], &gd->linedata[py],
ny * (sizeof *gd->linedata));
/* Wipe any lines that have been moved (without freeing them). */
for (yy = py; yy < py + ny; yy++) {
if (yy < dy || yy >= dy + ny)
grid_empty_line(gd, yy, bg);
}
}
/*
* Scroll the entire visible screen, moving one line into the history. Just
* allocate a new line at the bottom and move the history size indicator.
*/
void
grid_scroll_history(struct grid *gd, u_int bg)
{
u_int yy;
yy = gd->hsize + gd->sy;
gd->linedata = xreallocarray(gd->linedata, yy + 1,
sizeof *gd->linedata);
grid_empty_line(gd, yy, bg);
gd->hscrolled++;
gd->hsize++;
}
/* Clear lines. This just frees and truncates the lines. */
void
grid_clear_lines(struct grid *gd, u_int py, u_int ny, u_int bg)
{
u_int yy;
if (ny == 0)
return;
if (grid_check_y(gd, __func__, py) != 0)
return;
if (grid_check_y(gd, __func__, py + ny - 1) != 0)
return;
for (yy = py; yy < py + ny; yy++) {
grid_free_line(gd, yy);
grid_empty_line(gd, yy, bg);
}
}
/* Clear lines. This just frees and truncates the lines. */
void
grid_clear_lines(struct grid *gd, u_int py, u_int ny, u_int bg)
{
struct grid_line *gl;
u_int yy;
if (ny == 0)
return;
if (grid_check_y(gd, py) != 0)
return;
if (grid_check_y(gd, py + ny - 1) != 0)
return;
for (yy = py; yy < py + ny; yy++) {
gl = &gd->linedata[yy];
free(gl->celldata);
free(gl->extddata);
grid_empty_line(gd, yy, bg);
}
}