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Remember the number of lines scrolled into the history (versus cleared
into the history) and when resizing only use scrolled lines and not
cleared lines (which are probably not intended to reappear). From
Chaoren Lin.

/* $OpenBSD: grid-view.c,v 1.25 2016/09/02 20:57:20 nicm Exp $ */

/*
 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <string.h>

#include "tmux.h"

/*
 * Grid view functions. These work using coordinates relative to the visible
 * screen area.
 */

#define grid_view_x(gd, x) (x)
#define grid_view_y(gd, y) ((gd)->hsize + (y))

/* Get cell. */
void
grid_view_get_cell(struct grid *gd, u_int px, u_int py, struct grid_cell *gc)
{
	grid_get_cell(gd, grid_view_x(gd, px), grid_view_y(gd, py), gc);
}

/* Set cell. */
void
grid_view_set_cell(struct grid *gd, u_int px, u_int py,
    const struct grid_cell *gc)
{
	grid_set_cell(gd, grid_view_x(gd, px), grid_view_y(gd, py), gc);
}

/* Clear into history. */
void
grid_view_clear_history(struct grid *gd)
{
	struct grid_line	*gl;
	u_int			 yy, last;

	/* Find the last used line. */
	last = 0;
	for (yy = 0; yy < gd->sy; yy++) {
		gl = &gd->linedata[grid_view_y(gd, yy)];
		if (gl->cellsize != 0)
			last = yy + 1;
	}
	if (last == 0)
		return;

	/* Scroll the lines into the history. */
	for (yy = 0; yy < last; yy++) {
		grid_collect_history(gd);
		grid_scroll_history(gd);
	}
	gd->hscrolled = 0;
}

/* Clear area. */
void
grid_view_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny)
{
	px = grid_view_x(gd, px);
	py = grid_view_y(gd, py);

	grid_clear(gd, px, py, nx, ny);
}

/* Scroll region up. */
void
grid_view_scroll_region_up(struct grid *gd, u_int rupper, u_int rlower)
{
	if (gd->flags & GRID_HISTORY) {
		grid_collect_history(gd);
		if (rupper == 0 && rlower == gd->sy - 1)
			grid_scroll_history(gd);
		else {
			rupper = grid_view_y(gd, rupper);
			rlower = grid_view_y(gd, rlower);
			grid_scroll_history_region(gd, rupper, rlower);
		}
	} else {
		rupper = grid_view_y(gd, rupper);
		rlower = grid_view_y(gd, rlower);
		grid_move_lines(gd, rupper, rupper + 1, rlower - rupper);
	}
}

/* Scroll region down. */
void
grid_view_scroll_region_down(struct grid *gd, u_int rupper, u_int rlower)
{
	rupper = grid_view_y(gd, rupper);
	rlower = grid_view_y(gd, rlower);

	grid_move_lines(gd, rupper + 1, rupper, rlower - rupper);
}

/* Insert lines. */
void
grid_view_insert_lines(struct grid *gd, u_int py, u_int ny)
{
	u_int	sy;

	py = grid_view_y(gd, py);

	sy = grid_view_y(gd, gd->sy);

	grid_move_lines(gd, py + ny, py, sy - py - ny);
}

/* Insert lines in region. */
void
grid_view_insert_lines_region(struct grid *gd, u_int rlower, u_int py,
    u_int ny)
{
	u_int	ny2;

	rlower = grid_view_y(gd, rlower);

	py = grid_view_y(gd, py);

	ny2 = rlower + 1 - py - ny;
	grid_move_lines(gd, rlower + 1 - ny2, py, ny2);
	grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2);
}

/* Delete lines. */
void
grid_view_delete_lines(struct grid *gd, u_int py, u_int ny)
{
	u_int	sy;

	py = grid_view_y(gd, py);

	sy = grid_view_y(gd, gd->sy);

	grid_move_lines(gd, py, py + ny, sy - py - ny);
	grid_clear(gd, 0, sy - ny, gd->sx, py + ny - (sy - ny));
}

/* Delete lines inside scroll region. */
void
grid_view_delete_lines_region(struct grid *gd, u_int rlower, u_int py,
    u_int ny)
{
	u_int	ny2;

	rlower = grid_view_y(gd, rlower);

	py = grid_view_y(gd, py);

	ny2 = rlower + 1 - py - ny;
	grid_move_lines(gd, py, py + ny, ny2);
	grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2);
}

/* Insert characters. */
void
grid_view_insert_cells(struct grid *gd, u_int px, u_int py, u_int nx)
{
	u_int	sx;

	px = grid_view_x(gd, px);
	py = grid_view_y(gd, py);

	sx = grid_view_x(gd, gd->sx);

	if (px == sx - 1)
		grid_clear(gd, px, py, 1, 1);
	else
		grid_move_cells(gd, px + nx, px, py, sx - px - nx);
}

/* Delete characters. */
void
grid_view_delete_cells(struct grid *gd, u_int px, u_int py, u_int nx)
{
	u_int	sx;

	px = grid_view_x(gd, px);
	py = grid_view_y(gd, py);

	sx = grid_view_x(gd, gd->sx);

	grid_move_cells(gd, px, px + nx, py, sx - px - nx);
	grid_clear(gd, sx - nx, py, px + nx - (sx - nx), 1);
}

/* Convert cells into a string. */
char *
grid_view_string_cells(struct grid *gd, u_int px, u_int py, u_int nx)
{
	px = grid_view_x(gd, px);
	py = grid_view_y(gd, py);

	return (grid_string_cells(gd, px, py, nx, NULL, 0, 0, 0));
}