/* $OpenBSD: grid-view.c,v 1.39 2026/08/03 12:58:53 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);

}

/* Set padding. */

void

grid_view_set_padding(struct grid *gd, u_int px, u_int py, int bg)

{

  grid_set_padding(gd, grid_view_x(gd, px), grid_view_y(gd, py), bg);

}

/* Set cells. */

void

grid_view_set_cells(struct grid *gd, u_int px, u_int py,

    const struct grid_cell *gc, const char *s, size_t slen)

{

  grid_set_cells(gd, grid_view_x(gd, px), grid_view_y(gd, py), gc, s,

      slen);

}

/* Clear into history. */

void

grid_view_clear_history(struct grid *gd, u_int bg)

{

  struct grid_line  *gl;

  u_int      yy, last;

  /* Find the last used line. */

  last = 0;

  for (yy = 0; yy < gd->sy; yy++) {

    gl = grid_get_line(gd, grid_view_y(gd, yy));

    if (gl->cellused != 0)

      last = yy + 1;

#ifdef ENABLE_IMAGES

    else if (image_grid_line_has_images(gl))

      last = yy + 1;

#endif

  }

  if (last == 0) {

    grid_view_clear(gd, 0, 0, gd->sx, gd->sy, bg);

    return;

  }

  /* Scroll the lines into the history. */

  for (yy = 0; yy < last; yy++) {

    grid_collect_history(gd, 0);

    grid_scroll_history(gd, bg);

  }

  if (last < gd->sy)

    grid_view_clear(gd, 0, 0, gd->sx, gd->sy - last, bg);

  gd->hscrolled = 0;

}

/* Clear area. */

void

grid_view_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny,

    u_int bg)

{

  px = grid_view_x(gd, px);

  py = grid_view_y(gd, py);

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

}

/* Scroll region up. */

void

grid_view_scroll_region_up(struct grid *gd, u_int rupper, u_int rlower,

    u_int bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  u_int      n = rlower - rupper;

  if (gd->flags & GRID_HISTORY) {

    grid_collect_history(gd, 0);

    if (rupper == 0 && rlower == gd->sy - 1)

      grid_scroll_history(gd, bg);

    else {

      rupper = grid_view_y(gd, rupper);

      rlower = grid_view_y(gd, rlower);

#ifdef ENABLE_IMAGES

      saved = image_grid_save_lines(gd, rupper, rupper + 1, n, 1);

#endif

      grid_scroll_history_region(gd, rupper, rlower, bg);

#ifdef ENABLE_IMAGES

      image_grid_restore_lines(gd, saved);

#endif

    }

  } else {

    rupper = grid_view_y(gd, rupper);

    rlower = grid_view_y(gd, rlower);

#ifdef ENABLE_IMAGES

    saved = image_grid_save_lines(gd, rupper, rupper + 1, n, 1);

#endif

    grid_move_lines(gd, rupper, rupper + 1, n, bg);

#ifdef ENABLE_IMAGES

    image_grid_restore_lines(gd, saved);

#endif

  }

}

/* Scroll region down. */

void

grid_view_scroll_region_down(struct grid *gd, u_int rupper, u_int rlower,

    u_int bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  rupper = grid_view_y(gd, rupper);

  rlower = grid_view_y(gd, rlower);

#ifdef ENABLE_IMAGES

  saved = image_grid_save_lines(gd, rupper + 1, rupper, rlower - rupper, 1);

#endif

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

#ifdef ENABLE_IMAGES

  image_grid_restore_lines(gd, saved);

#endif

}

/* Insert lines. */

void

grid_view_insert_lines(struct grid *gd, u_int py, u_int ny, u_int bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  u_int      sy;

  py = grid_view_y(gd, py);

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

#ifdef ENABLE_IMAGES

  saved = image_grid_save_lines(gd, py + ny, py, sy - py - ny, 0);

#endif

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

#ifdef ENABLE_IMAGES

  image_grid_restore_lines(gd, saved);

#endif

}

/* Insert lines in region. */

void

grid_view_insert_lines_region(struct grid *gd, u_int rlower, u_int py,

    u_int ny, u_int bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  u_int      ny2;

  rlower = grid_view_y(gd, rlower);

  py = grid_view_y(gd, py);

  ny2 = rlower + 1 - py - ny;

#ifdef ENABLE_IMAGES

  saved = image_grid_save_lines(gd, rlower + 1 - ny2, py, ny2, 0);

#endif

  grid_move_lines(gd, rlower + 1 - ny2, py, ny2, bg);

#ifdef ENABLE_IMAGES

  image_grid_restore_lines(gd, saved);

#endif

  grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2, bg);

}

/* Delete lines. */

void

grid_view_delete_lines(struct grid *gd, u_int py, u_int ny, u_int bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  u_int      sy;

  py = grid_view_y(gd, py);

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

#ifdef ENABLE_IMAGES

  saved = image_grid_save_lines(gd, py, py + ny, sy - py - ny, 0);

#endif

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

#ifdef ENABLE_IMAGES

  image_grid_restore_lines(gd, saved);

#endif

  grid_clear(gd, 0, sy - ny, gd->sx, ny, bg);

}

/* 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 bg)

{

#ifdef ENABLE_IMAGES

  struct image_saved  *saved;

#endif

  u_int      ny2;

  rlower = grid_view_y(gd, rlower);

  py = grid_view_y(gd, py);

  ny2 = rlower + 1 - py - ny;

#ifdef ENABLE_IMAGES

  saved = image_grid_save_lines(gd, py, py + ny, ny2, 0);

#endif

  grid_move_lines(gd, py, py + ny, ny2, bg);

#ifdef ENABLE_IMAGES

  image_grid_restore_lines(gd, saved);

#endif

  grid_clear(gd, 0, py + ny2, gd->sx, ny - ny2, bg);

}

/* Insert characters. */

void

grid_view_insert_cells(struct grid *gd, u_int px, u_int py, u_int nx, u_int bg)

{

  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, bg);

  else

    grid_move_cells(gd, px + nx, px, py, sx - px - nx, bg);

}

/* Delete characters. */

void

grid_view_delete_cells(struct grid *gd, u_int px, u_int py, u_int nx, u_int bg)

{

  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, bg);

  grid_clear(gd, sx - nx, py, nx, 1, bg);

}

/* 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, NULL));

}