Function display_map_window

win/X11/winmap.c:993–1038

* Check if there are any changed characters. If so, then plaster them on * the screen. */

 * the screen.
 */
void
display_map_window(struct xwindow *wp)
{
    int row;
    struct map_info_t *map_info = wp->map_information;

    if ((Is_rogue_level(&u.uz) ? map_info->is_tile
                               : (map_info->is_tile != iflags.wc_tiled_map))
        && map_info->tile_map.image_width) {
        int i;

        /* changed map display mode, re-display the full map */
        for (i = 0; i < ROWNO; i++) {
            map_info->t_start[i] = 0;
            map_info->t_stop[i] = COLNO-1;
        }
        map_info->is_tile = iflags.wc_tiled_map && !Is_rogue_level(&u.uz);
        XClearWindow(XtDisplay(wp->w), XtWindow(wp->w));
        set_map_size(wp, COLNO, ROWNO);
        check_cursor_visibility(wp);
        highlight_yn(TRUE); /* change fg/bg to match map */
    } else if (wp->prevx != wp->cursx || wp->prevy != wp->cursy) {
        coordxy x = wp->prevx, y = wp->prevy;

        /*
         * Previous cursor position is not the same as the current
         * cursor position, update the old cursor position.
         */
        if (x < map_info->t_start[y])
            map_info->t_start[y] = x;
        if (x > map_info->t_stop[y])
            map_info->t_stop[y] = x;
    }

    for (row = 0; row < ROWNO; row++) {
        if (map_info->t_start[row] <= map_info->t_stop[row]) {
            map_update(wp, row, row, (int) map_info->t_start[row],
                       (int) map_info->t_stop[row], FALSE);
            map_info->t_start[row] = COLNO - 1;
            map_info->t_stop[row] = 0;
        }
    }
    display_cursor(wp);
    wp->prevx = wp->cursx; /* adjust old cursor position */
    wp->prevy = wp->cursy;
}

/*
 * Set all map tiles and characters to S_unexplored (was S_stone).