rxvt-unicode/src/screen.C

/*--------------------------------*-C-*--------------------------------------*
 * File:        screen.c
 *---------------------------------------------------------------------------*
 *
 * Copyright (c) 1997-2001 Geoff Wing <gcw@pobox.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *--------------------------------------------------------------------------*/
/*
 * We handle _all_ screen updates and selections
 */

#include "../config.h"          /* NECESSARY */
#define INTERN_SCREEN
#include "rxvt.h"               /* NECESSARY */
#include "screen.intpro"        /* PROTOS for internal routines */

#include <X11/Xmd.h>            /* get the typedef for CARD32 */

#include <stdint.h>
#include <wchar.h>

#include "salloc.C" // HACK!!

inline void fill_text (text_t *start, text_t value, int len)
{
  while (len--)
    *start++ = value;
}

/* ------------------------------------------------------------------------- */
#define PROP_SIZE               16384
#define TABSIZE                 8       /* default tab size */

/* ------------------------------------------------------------------------- *
 *             GENERAL SCREEN AND SELECTION UPDATE ROUTINES                  *
 * ------------------------------------------------------------------------- */
#define ZERO_SCROLLBACK()                                              \
    if ((Options & Opt_scrollTtyOutput) == Opt_scrollTtyOutput)    \
        TermWin.view_start = 0
#define CLEAR_SELECTION()                                              \
    selection.beg.row = selection.beg.col                     \
        = selection.end.row = selection.end.col = 0
#define CLEAR_ALL_SELECTION()                                          \
    selection.beg.row = selection.beg.col                     \
        = selection.mark.row = selection.mark.col             \
        = selection.end.row = selection.end.col = 0

#define ROW_AND_COL_IS_AFTER(A, B, C, D)                                \
    (((A) > (C)) || (((A) == (C)) && ((B) > (D))))
#define ROW_AND_COL_IS_BEFORE(A, B, C, D)                               \
    (((A) < (C)) || (((A) == (C)) && ((B) < (D))))
#define ROW_AND_COL_IN_ROW_AFTER(A, B, C, D)                            \
    (((A) == (C)) && ((B) > (D)))
#define ROW_AND_COL_IN_ROW_AT_OR_AFTER(A, B, C, D)                      \
    (((A) == (C)) && ((B) >= (D)))
#define ROW_AND_COL_IN_ROW_BEFORE(A, B, C, D)                           \
    (((A) == (C)) && ((B) < (D)))
#define ROW_AND_COL_IN_ROW_AT_OR_BEFORE(A, B, C, D)                     \
    (((A) == (C)) && ((B) <= (D)))

/* these must be row_col_t */
#define ROWCOL_IS_AFTER(X, Y)                                           \
    ROW_AND_COL_IS_AFTER((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IS_BEFORE(X, Y)                                          \
    ROW_AND_COL_IS_BEFORE((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AFTER(X, Y)                                       \
    ROW_AND_COL_IN_ROW_AFTER((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_BEFORE(X, Y)                                      \
    ROW_AND_COL_IN_ROW_BEFORE((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AT_OR_AFTER(X, Y)                                 \
    ROW_AND_COL_IN_ROW_AT_OR_AFTER((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AT_OR_BEFORE(X, Y)                                \
    ROW_AND_COL_IN_ROW_AT_OR_BEFORE((X).row, (X).col, (Y).row, (Y).col)

/*
 * CLEAR_ROWS : clear <num> rows starting from row <row>
 * CLEAR_CHARS: clear <num> chars starting from pixel position <x,y>
 * ERASE_ROWS : set <num> rows starting from row <row> to the foreground colour
 */
#define drawBuffer      TermWin.vt

#define CLEAR_ROWS(row, num)                                            \
    if (TermWin.mapped)                                              \
        XClearArea (Xdisplay, drawBuffer, TermWin.int_bwidth,      \
                    Row2Pixel(row), (unsigned int)TermWin.width,      \
                    (unsigned int)Height2Pixel(num), False)

#define CLEAR_CHARS(x, y, num)                                          \
    if (TermWin.mapped)                                              \
        XClearArea (Xdisplay, drawBuffer, x, y,                       \
                    (unsigned int)Width2Pixel(num),                      \
                    (unsigned int)Height2Pixel(1), False)

#define ERASE_ROWS(row, num)                                            \
    XFillRectangle (Xdisplay, drawBuffer, TermWin.gc,              \
                    TermWin.int_bwidth, Row2Pixel(row),               \
                    (unsigned int)TermWin.width,                      \
                    (unsigned int)Height2Pixel(num))

/* ------------------------------------------------------------------------- *
 *                        SCREEN `COMMON' ROUTINES                           *
 * ------------------------------------------------------------------------- */
/* Fill part/all of a line with blanks. */
void
rxvt_term::scr_blank_line (text_t *et, rend_t *er, unsigned int width, rend_t efs)
{
  efs &= ~RS_baseattrMask;
  efs = SET_FONT (efs, TermWin.fontset->find_font (' '));

  while (width--)
    {
      *et++ = ' ';
      *er++ = efs;
    }
}

/* ------------------------------------------------------------------------- */
/* Fill a full line with blanks - make sure it is allocated first */
void
rxvt_term::scr_blank_screen_mem (text_t **tp, rend_t **rp, unsigned int row, rend_t efs)
{
#ifdef DEBUG_STRICT
  assert((tp[row] && rp[row]) || (tp[row] == NULL && rp[row] == NULL));
#endif
  if (tp[row] == NULL)
    {
      tp[row] = (text_t *)talloc->alloc ();
      rp[row] = (rend_t *)ralloc->alloc ();
    }

  scr_blank_line (tp[row], rp[row], TermWin.ncol, efs);
}

/* ------------------------------------------------------------------------- *
 *                          SCREEN INITIALISATION                            *
 * ------------------------------------------------------------------------- */
void
rxvt_term::scr_reset ()
{
  unsigned int ncol, nrow, total_rows, prev_total_rows;
  unsigned int p, q;
  int k;
  rend_t setrstyle;

  D_SCREEN((stderr, "rxvt_scr_reset()"));

  TermWin.view_start = 0;
  num_scr = 0;

  if (TermWin.ncol == 0)
    TermWin.ncol = 80;

  if (TermWin.nrow == 0)
    TermWin.nrow = 24;

  ncol = TermWin.ncol;
  nrow = TermWin.nrow;

  if (ncol == prev_ncol && nrow == prev_nrow)
    return;

  want_refresh = 1;

  total_rows = nrow + TermWin.saveLines;
  prev_total_rows = prev_nrow + TermWin.saveLines;

  screen.tscroll = 0;
  screen.bscroll = nrow - 1;

  if (!talloc)
    {
      talloc = new rxvt_salloc (ncol * sizeof (text_t));
      ralloc = new rxvt_salloc (ncol * sizeof (rend_t));
    }

  if (prev_nrow == 0)
    {
      /*
       * first time called so just malloc everything : don't rely on realloc
       * Note: this is still needed so that all the scrollback lines are NULL
       */
      screen.text = (text_t **)rxvt_calloc(total_rows, sizeof(text_t *));
      buf_text = (text_t **)rxvt_calloc(total_rows, sizeof(text_t *));
      drawn_text = (text_t **)rxvt_calloc(nrow, sizeof(text_t *));
      swap.text = (text_t **)rxvt_calloc(nrow, sizeof(text_t *));

      screen.tlen = (int16_t *)rxvt_calloc(total_rows, sizeof(int16_t));
      swap.tlen = (int16_t *)rxvt_calloc(nrow, sizeof(int16_t));

      screen.rend = (rend_t **)rxvt_calloc(total_rows, sizeof(rend_t *));
      buf_rend = (rend_t **)rxvt_calloc(total_rows, sizeof(rend_t *));
      drawn_rend = (rend_t **)rxvt_calloc(nrow, sizeof(rend_t *));
      swap.rend = (rend_t **)rxvt_calloc(nrow, sizeof(rend_t *));

      for (p = 0; p < nrow; p++)
        {
          q = p + TermWin.saveLines;
          scr_blank_screen_mem (screen.text, screen.rend, q, DEFAULT_RSTYLE);
          scr_blank_screen_mem (swap.text, swap.rend, p, DEFAULT_RSTYLE);
          screen.tlen[q] = swap.tlen[p] = 0;
          scr_blank_screen_mem (drawn_text, drawn_rend, p, DEFAULT_RSTYLE);
        }

      MEMSET(charsets, 'B', sizeof(charsets));
      TermWin.nscrolled = 0;       /* no saved lines */
      rstyle = DEFAULT_RSTYLE;
      screen.flags = Screen_DefaultFlags;
      screen.cur.row = screen.cur.col = 0;
      screen.charset = 0;
      current_screen = PRIMARY;
      scr_cursor (SAVE);

#if NSCREENS
      swap.flags = Screen_DefaultFlags;
      swap.cur.row = swap.cur.col = 0;
      swap.charset = 0;
      current_screen = SECONDARY;
      scr_cursor (SAVE);
      current_screen = PRIMARY;
#endif

      selection.text = NULL;
      selection.len = 0;
      selection.op = SELECTION_CLEAR;
      selection.screen = PRIMARY;
      selection.clicks = 0;
      CLEAR_ALL_SELECTION ();
      rvideo = 0;
    }
  else
    {
      /*
       * add or delete rows as appropriate
       */
      setrstyle = DEFAULT_RSTYLE;

      if (nrow < prev_nrow)
        {
          /* delete rows */
          k = min (TermWin.nscrolled, prev_nrow - nrow);
          scr_scroll_text (0, (int)prev_nrow - 1, k, 1);

          for (p = nrow; p < prev_nrow; p++)
            {
              q = p + TermWin.saveLines;
              if (screen.text[q])
                {
#ifdef DEBUG_STRICT
                  assert (screen.rend[q]);
#endif
                  talloc->free (screen.text[q]);
                  ralloc->free (screen.rend[q]);
                }
              if (swap.text[p])
                {
#ifdef DEBUG_STRICT
                  assert (swap.rend[p]);
#endif
                  talloc->free (swap.text[p]);
                  ralloc->free (swap.rend[p]);
                }
#ifdef DEBUG_STRICT
              assert (drawn_text[p] && drawn_rend[p]);
#endif
              talloc->free (drawn_text[p]);
              ralloc->free (drawn_rend[p]);
            }

          /* we have fewer rows so fix up cursor position */
          MIN_IT (screen.cur.row, (int32_t)nrow - 1);
          MIN_IT (swap.cur.row, (int32_t)nrow - 1);

          scr_reset_realloc (); /* realloc _last_ */
        }
      else if (nrow > prev_nrow)
        {
          /* add rows */
          scr_reset_realloc (); /* realloc _first_ */

          TermWin.ncol = prev_ncol; // save b/c scr_blank_screen_mem uses this

          k = min (TermWin.nscrolled, nrow - prev_nrow);

          for (p = prev_total_rows; p < total_rows; p++)
            {
              screen.tlen[p] = 0;
              screen.text[p] = NULL;
              screen.rend[p] = NULL;
            }

          for (p = prev_total_rows; p < total_rows - k; p++)
            scr_blank_screen_mem (screen.text, screen.rend, p, setrstyle);

          for (p = prev_nrow; p < nrow; p++)
            {
              swap.tlen[p] = 0;
              swap.text[p] = NULL;
              swap.rend[p] = NULL;
              drawn_text[p] = NULL;
              drawn_rend[p] = NULL;
              scr_blank_screen_mem (swap.text, swap.rend, p, setrstyle);
              scr_blank_screen_mem (drawn_text, drawn_rend, p, setrstyle);
            }

          if (k > 0)
            {
              scr_scroll_text (0, (int)nrow - 1, -k, 1);
              screen.cur.row += k;
              screen.s_cur.row += k;
              TermWin.nscrolled -= k;
            }
#ifdef DEBUG_STRICT
          assert(screen.cur.row < TermWin.nrow);
          assert(swap.cur.row < TermWin.nrow);
#else                           /* drive with your eyes closed */

          MIN_IT(screen.cur.row, nrow - 1);
          MIN_IT(swap.cur.row, nrow - 1);
#endif
          TermWin.ncol =  ncol; // save b/c scr_blank_screen_mem uses this
        }

      /* resize columns */
      if (ncol != prev_ncol)
        {
          int common = min (prev_ncol, ncol);
          rxvt_salloc *ta = new rxvt_salloc (ncol * sizeof (text_t));
          rxvt_salloc *ra = new rxvt_salloc (ncol * sizeof (rend_t));

          for (p = 0; p < total_rows; p++)
            {
              if (screen.text[p])
                {
                  text_t *t = (text_t *)ta->alloc (); memcpy (t, screen.text[p], common * sizeof (text_t)); screen.text[p] = t;
                  rend_t *r = (rend_t *)ra->alloc (); memcpy (r, screen.rend[p], common * sizeof (rend_t)); screen.rend[p] = r;

                  MIN_IT(screen.tlen[p], (int16_t)ncol);

                  if (ncol > prev_ncol)
                    scr_blank_line (&(screen.text[p][prev_ncol]),
                                    &(screen.rend[p][prev_ncol]),
                                    ncol - prev_ncol,
                                    setrstyle);
                }
            }

          for (p = 0; p < nrow; p++)
            {
              text_t *t = (text_t *)ta->alloc (); memcpy (t, drawn_text[p], common * sizeof (text_t)); drawn_text[p] = t;
              rend_t *r = (rend_t *)ra->alloc (); memcpy (r, drawn_rend[p], common * sizeof (rend_t)); drawn_rend[p] = r;

              if (ncol > prev_ncol)
                scr_blank_line (&(drawn_text[p][prev_ncol]),
                                &(drawn_rend[p][prev_ncol]),
                                ncol - prev_ncol, setrstyle);

              if (swap.text[p])
                {
                  text_t *t = (text_t *)ta->alloc (); memcpy (t, swap.text[p], common * sizeof (text_t)); swap.text[p] = t;
                  rend_t *r = (rend_t *)ra->alloc (); memcpy (r, swap.rend[p], common * sizeof (rend_t)); swap.rend[p] = r;

                  MIN_IT(swap.tlen[p], (int16_t)ncol);

                  if (ncol > prev_ncol)
                    scr_blank_line (&(swap.text[p][prev_ncol]),
                                    &(swap.rend[p][prev_ncol]),
                                    ncol - prev_ncol, setrstyle);
                }

            }

          MIN_IT (screen.cur.col, (int16_t)ncol - 1);
          MIN_IT (swap.cur.col, (int16_t)ncol - 1);

          delete talloc; talloc = ta;
          delete ralloc; ralloc = ra;
        }

      if (tabs)
        free(tabs);
    }

  prev_nrow = nrow;
  prev_ncol = ncol;

  tabs = (char *)rxvt_malloc (ncol * sizeof(char));

  for (p = 0; p < ncol; p++)
    tabs[p] = (p % TABSIZE == 0) ? 1 : 0;

  tt_winch ();
}

void
rxvt_term::scr_reset_realloc()
{
  uint16_t total_rows, nrow;

  nrow = TermWin.nrow;
  total_rows = nrow + TermWin.saveLines;
  /* *INDENT-OFF* */
  screen.text = (text_t **)rxvt_realloc(screen.text, total_rows * sizeof(text_t *));
  buf_text    = (text_t **)rxvt_realloc(buf_text   , total_rows * sizeof(text_t *));
  drawn_text  = (text_t **)rxvt_realloc(drawn_text , nrow       * sizeof(text_t *));
  swap.text   = (text_t **)rxvt_realloc(swap.text  , nrow       * sizeof(text_t *));

  screen.tlen = (int16_t *)rxvt_realloc(screen.tlen, total_rows * sizeof(int16_t));
  swap.tlen   = (int16_t *)rxvt_realloc(swap.tlen  , total_rows * sizeof(int16_t));

  screen.rend = (rend_t **)rxvt_realloc(screen.rend, total_rows * sizeof(rend_t *));
  buf_rend    = (rend_t **)rxvt_realloc(buf_rend   , total_rows * sizeof(rend_t *));
  drawn_rend  = (rend_t **)rxvt_realloc(drawn_rend , nrow       * sizeof(rend_t *));
  swap.rend   = (rend_t **)rxvt_realloc(swap.rend  , nrow       * sizeof(rend_t *));
  /* *INDENT-ON* */
}

/* ------------------------------------------------------------------------- */
/*
 * Free everything.  That way malloc debugging can find leakage.
 */
void
rxvt_term::scr_release()
{
  uint16_t total_rows;
  int i;

  total_rows = TermWin.nrow + TermWin.saveLines;

#ifdef DEBUG_STRICT
  for (i = 0; i < total_rows; i++)
    {
      if (screen.text[i])
        /* then so is screen.rend[i] */
        assert(screen.rend[i]);
    }
#endif

  delete talloc; talloc = 0;
  delete ralloc; ralloc = 0;

  free (screen.text);
  free (screen.tlen);
  free (screen.rend);
  free (drawn_text);
  free (drawn_rend);
  free (swap.text);
  free (swap.tlen);
  free (swap.rend);
  free (buf_text);
  free (buf_rend);
  free (tabs);

  /* NULL these so if anything tries to use them, we'll know about it */
  screen.text = drawn_text = swap.text = NULL;
  screen.rend = drawn_rend = swap.rend = NULL;
  screen.tlen = swap.tlen = NULL;
  buf_text = NULL;
  buf_rend = NULL;
  tabs = NULL;
}

/* ------------------------------------------------------------------------- */
/*
 * Hard reset
 */
void
rxvt_term::scr_poweron ()
{
  D_SCREEN((stderr, "rxvt_scr_poweron()"));

  scr_release ();
  prev_nrow = prev_ncol = 0;
  scr_reset ();

  scr_clear ();
  scr_refresh (SLOW_REFRESH);
#ifdef RXVT_GRAPHICS
  Gr_reset ();
#endif
}

/* ------------------------------------------------------------------------- *
 *                         PROCESS SCREEN COMMANDS                           *
 * ------------------------------------------------------------------------- */
/*
 * Save and Restore cursor
 * XTERM_SEQ: Save cursor   : ESC 7
 * XTERM_SEQ: Restore cursor: ESC 8
 */
void
rxvt_term::scr_cursor (int mode)
{
  screen_t       *s;

  D_SCREEN((stderr, "rxvt_scr_cursor(%c)", mode));

#if NSCREENS && !defined(NO_SECONDARY_SCREEN_CURSOR)
  if (current_screen == SECONDARY)
    s = &(swap);
  else
#endif
    s = &(screen);
  switch (mode)
    {
      case SAVE:
        s->s_cur.row = s->cur.row;
        s->s_cur.col = s->cur.col;
        s->s_rstyle = rstyle;
        s->s_charset = s->charset;
        s->s_charset_char = charsets[s->charset];
        break;
      case RESTORE:
        want_refresh = 1;
        s->cur.row = s->s_cur.row;
        s->cur.col = s->s_cur.col;
        s->flags &= ~Screen_WrapNext;
        rstyle = s->s_rstyle;
        s->charset = s->s_charset;
        charsets[s->charset] = s->s_charset_char;
        set_font_style ();
        break;
    }
  /* boundary check in case screen size changed between SAVE and RESTORE */
  MIN_IT(s->cur.row, TermWin.nrow - 1);
  MIN_IT(s->cur.col, TermWin.ncol - 1);
#ifdef DEBUG_STRICT
  assert(s->cur.row >= 0);
  assert(s->cur.col >= 0);
#else                           /* drive with your eyes closed */
  MAX_IT(s->cur.row, 0);
  MAX_IT(s->cur.col, 0);
#endif
}

/* ------------------------------------------------------------------------- */
/*
 * Swap between primary and secondary screens
 * XTERM_SEQ: Primary screen  : ESC [ ? 4 7 h
 * XTERM_SEQ: Secondary screen: ESC [ ? 4 7 l
 */
int
rxvt_term::scr_change_screen (int scrn)
{
  int             i;
#if NSCREENS
  int             offset;
#endif

  want_refresh = 1;

  D_SCREEN((stderr, "rxvt_scr_change_screen(%d)", scrn));

  TermWin.view_start = 0;

  if (current_screen == scrn)
    return current_screen;

  selection_check (2);        /* check for boundary cross */

  SWAP_IT(current_screen, scrn, int);
#if NSCREENS
  num_scr = 0;
  offset = TermWin.saveLines;
  for (i = prev_nrow; i--;)
    {
      SWAP_IT(screen.text[i + offset], swap.text[i], text_t *);
      SWAP_IT(screen.tlen[i + offset], swap.tlen[i], int16_t);
      SWAP_IT(screen.rend[i + offset], swap.rend[i], rend_t *);
    }
  SWAP_IT(screen.cur.row, swap.cur.row, int16_t);
  SWAP_IT(screen.cur.col, swap.cur.col, int16_t);
# ifdef DEBUG_STRICT
  assert((screen.cur.row >= 0) && (screen.cur.row < prev_nrow));
  assert((screen.cur.col >= 0) && (screen.cur.col < prev_ncol));
# else                          /* drive with your eyes closed */
  MAX_IT(screen.cur.row, 0);
  MIN_IT(screen.cur.row, (int32_t)prev_nrow - 1);
  MAX_IT(screen.cur.col, 0);
  MIN_IT(screen.cur.col, (int32_t)prev_ncol - 1);
# endif
  SWAP_IT(screen.charset, swap.charset, int16_t);
  SWAP_IT(screen.flags, swap.flags, int);
  screen.flags |= Screen_VisibleCursor;
  swap.flags |= Screen_VisibleCursor;

# ifdef RXVT_GRAPHICS

  if (Gr_Displayed ())
    {
      Gr_scroll (0);
      Gr_ChangeScreen ();
    }
# endif
#else
# ifdef SCROLL_ON_NO_SECONDARY
#  ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_ClearScreen ();
#  endif
  if (current_screen == PRIMARY
#  ifdef RXVT_GRAPHICS
      && !Gr_Displayed ()
#  endif
     )
    scr_scroll_text(0, (prev_nrow - 1), prev_nrow, 0);
# endif
#endif
  return scrn;
}

/* ------------------------------------------------------------------------- */
/*
 * Change the colour for following text
 */
void
rxvt_term::scr_color (unsigned int color, int fgbg)
{
  color &= RS_fgMask;
  if (fgbg == Color_fg)
    rstyle = SET_FGCOLOR(rstyle, color);
  else
    rstyle = SET_BGCOLOR(rstyle, color);
}

/* ------------------------------------------------------------------------- */
/*
 * Change the rendition style for following text
 */
void
rxvt_term::scr_rendition (int set, int style)
  {
    if (set)
      rstyle |= style;
    else if (style == ~RS_None)
      rstyle = DEFAULT_RSTYLE;
    else
      rstyle &= ~style;
  }

/* ------------------------------------------------------------------------- */
/*
 * Scroll text between <row1> and <row2> inclusive, by <count> lines
 * count positive ==> scroll up
 * count negative ==> scroll down
 * spec == 0 for normal routines
 */
int
rxvt_term::scr_scroll_text (int row1, int row2, int count, int spec)
{
  int i, j;
  long nscrolled;

  if (count == 0 || (row1 > row2))
    return 0;

  want_refresh = 1;
  D_SCREEN((stderr, "rxvt_scroll_text(%d,%d,%d,%d): %s", row1, row2, count, spec, (current_screen == PRIMARY) ? "Primary" : "Secondary"));

  if ((count > 0) && (row1 == 0) && (current_screen == PRIMARY))
    {
      nscrolled = (long)TermWin.nscrolled + (long)count;

      if (nscrolled > (long)TermWin.saveLines)
        TermWin.nscrolled = TermWin.saveLines;
      else
        TermWin.nscrolled = (uint16_t)nscrolled;

      if ((Options & Opt_scrollWithBuffer)
          && TermWin.view_start != 0
          && TermWin.view_start != TermWin.saveLines)
        scr_page (UP, count);
    }
  else if (!spec)
    row1 += TermWin.saveLines;

  row2 += TermWin.saveLines;

  if (selection.op && current_screen == selection.screen)
    {
      i = selection.beg.row + TermWin.saveLines;
      j = selection.end.row + TermWin.saveLines;
      if ((i < row1 && j > row1)
          || (i < row2 && j > row2)
          || (i - count < row1 && i >= row1)
          || (i - count > row2 && i <= row2)
          || (j - count < row1 && j >= row1)
          || (j - count > row2 && j <= row2))
        {
          CLEAR_ALL_SELECTION ();
          selection.op = SELECTION_CLEAR;  /* XXX: too aggressive? */
        }
      else if (j >= row1 && j <= row2)
        {
          /* move selected region too */
          selection.beg.row -= count;
          selection.end.row -= count;
          selection.mark.row -= count;
        }
    }

  selection_check (0);        /* _after_ TermWin.nscrolled update */

  num_scr += count;
  j = count;

  if (count < 0)
    count = -count;

  i = row2 - row1 + 1;
  MIN_IT(count, i);

  if (j > 0)
    {
      /* A: scroll up */

      /* A1: Copy lines that will get clobbered by the rotation */
      for (i = 0, j = row1; i < count; i++, j++)
        {
          buf_text[i] = screen.text[j];
          buf_rend[i] = screen.rend[j];
        }
      /* A2: Rotate lines */
      for (j = row1, i = j + count; i <= row2; i++, j++)
        {
          screen.tlen[j] = screen.tlen[i];
          screen.text[j] = screen.text[i];
          screen.rend[j] = screen.rend[i];
        }
      j = row2 - count + 1, i = count;
    }
  else /* if (j < 0) */
    {
      /* B: scroll down */

      /* B1: Copy lines that will get clobbered by the rotation */
      for (i = 0, j = row2; i < count; i++, j--)
        {
          buf_text[i] = screen.text[j];
          buf_rend[i] = screen.rend[j];
        }
      /* B2: Rotate lines */
      for (j = row2, i = j - count; i >= row1; i--, j--)
        {
          screen.tlen[j] = screen.tlen[i];
          screen.text[j] = screen.text[i];
          screen.rend[j] = screen.rend[i];
        }
      j = row1, i = count;
      count = -count;
    }

  /* C: Resurrect lines */
  for (; i--; j++)
    {
      screen.tlen[j] = 0;
      screen.text[j] = buf_text[i];
      screen.rend[j] = buf_rend[i];

      if (!spec)              /* line length may not equal TermWin.ncol */
        scr_blank_screen_mem (screen.text, screen.rend,
                              (unsigned int)j, rstyle);
    }

#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (count);
#endif

  return count;
}

/* ------------------------------------------------------------------------- */
/*
 * Add text given in <str> of length <len> to screen struct
 */
void
rxvt_term::scr_add_lines (const uint32_t *str, int nlines, int len)
{
  unsigned char   checksel, clearsel;
  uint32_t        c;
  int             i, row, last_col;
  text_t         *stp;
  rend_t         *srp;

  if (len <= 0)               /* sanity */
    return;

  want_refresh = 1;
  last_col = TermWin.ncol;

  D_SCREEN((stderr, "rxvt_scr_add_lines(%d,%d)", nlines, len));
  ZERO_SCROLLBACK();
  if (nlines > 0)
    {
      nlines += (screen.cur.row - screen.bscroll);
      if ((nlines > 0)
          && (screen.tscroll == 0)
          && (screen.bscroll == (TermWin.nrow - 1)))
        {
          /* _at least_ this many lines need to be scrolled */
          scr_scroll_text(screen.tscroll, screen.bscroll, nlines, 0);
          screen.cur.row -= nlines;
        }
    }
#ifdef DEBUG_STRICT
  assert(screen.cur.col < last_col);
  assert((screen.cur.row < TermWin.nrow)
         && (screen.cur.row >= -(int32_t)TermWin.nscrolled));
#else                           /* drive with your eyes closed */
  MIN_IT(screen.cur.col, last_col - 1);
  MIN_IT(screen.cur.row, (int32_t)TermWin.nrow - 1);
  MAX_IT(screen.cur.row, -(int32_t)TermWin.nscrolled);
#endif
  row = screen.cur.row + TermWin.saveLines;

  checksel = (selection.op
              && current_screen == selection.screen) ? 1 : 0;
  clearsel = 0;

  stp = screen.text[row];
  srp = screen.rend[row];

  for (i = 0; i < len;)
    {
      c = str[i++];
      switch (c)
        {
          case '\t':
            scr_tab (1);
            continue;
          case '\n':
            if (screen.tlen[row] != -1)      /* XXX: think about this */
              MAX_IT(screen.tlen[row], screen.cur.col);
            screen.flags &= ~Screen_WrapNext;
            if (screen.cur.row == screen.bscroll)
              scr_scroll_text (screen.tscroll, screen.bscroll, 1, 0);
            else if (screen.cur.row < (TermWin.nrow - 1))
              row = (++screen.cur.row) + TermWin.saveLines;
            stp = screen.text[row];  /* _must_ refresh */
            srp = screen.rend[row];  /* _must_ refresh */
            continue;
          case '\r':
            if (screen.tlen[row] != -1)      /* XXX: think about this */
              MAX_IT(screen.tlen[row], screen.cur.col);
            screen.flags &= ~Screen_WrapNext;
            screen.cur.col = 0;
            continue;
          default:
            if (c == 127)
              continue;       /* yummmm..... */
            break;
        }

      if (checksel            /* see if we're writing within selection */
          && !ROWCOL_IS_BEFORE(screen.cur, selection.beg)
          && ROWCOL_IS_BEFORE(screen.cur, selection.end))
        {
          checksel = 0;
          clearsel = 1;
        }
      if (screen.flags & Screen_WrapNext)
        {
          screen.tlen[row] = -1;
          if (screen.cur.row == screen.bscroll)
            scr_scroll_text(screen.tscroll, screen.bscroll, 1, 0);
          else if (screen.cur.row < (TermWin.nrow - 1))
            row = (++screen.cur.row) + TermWin.saveLines;
          stp = screen.text[row];  /* _must_ refresh */
          srp = screen.rend[row];  /* _must_ refresh */
          screen.cur.col = 0;
          screen.flags &= ~Screen_WrapNext;
        }
      if (screen.flags & Screen_Insert)
        scr_insdel_chars (1, INSERT);

      if (charsets[screen.charset] == '0') // DEC SPECIAL
        switch (c)
          {
            case '+': c = 0x2192; break; case ',': c = 0x2190; break; case '-': c = 0x2191; break;
            case '.': c = 0x2193; break; case '0': c = 0x25ae; break; case '`': c = 0x25c6; break;
            case 'a': c = 0x2592; break; case 'f': c = 0x00b0; break; case 'g': c = 0x00b1; break;
            case 'h': c = 0x2592; break; case 'i': c = 0x2603; break; case 'j': c = 0x2518; break;
            case 'k': c = 0x2510; break; case 'l': c = 0x250c; break; case 'm': c = 0x2514; break;
            case 'n': c = 0x253c; break; case 'o': c = 0x23ba; break; case 'p': c = 0x23bb; break;
            case 'q': c = 0x2500; break; case 'r': c = 0x23bc; break; case 's': c = 0x23bd; break;
            case 't': c = 0x251c; break; case 'u': c = 0x2524; break; case 'v': c = 0x2534; break;
            case 'w': c = 0x252c; break; case 'x': c = 0x2502; break; case 'y': c = 0x2264; break;
            case 'z': c = 0x2265; break; case '{': c = 0x03c0; break; case '|': c = 0x2260; break;
            case '}': c = 0x00a3; break; case '~': c = 0x00b7; break;
          }

      rend_t rend = SET_FONT (rstyle, TermWin.fontset->find_font (c));
      // rely on wcwidth to tell us the character width, at least for non-ascii
      int width = c <= 128 ? 1 : wcwidth (c);

      // width -1 characters (e.g. combining chars) are ignored currently.
      if (width > 0)
        do
          {
            stp[screen.cur.col] = c;
            srp[screen.cur.col] = rend;

            if (screen.cur.col < last_col - 1)
              screen.cur.col++;
            else
              {
                screen.tlen[row] = last_col;
                if (screen.flags & Screen_Autowrap)
                  screen.flags |= Screen_WrapNext;
                break;
              }

            c = NOCHAR;
          }
        while (--width > 0);
      else
        (void)0; /* handle combining character etc. here. */
    }

  if (screen.tlen[row] != -1)      /* XXX: think about this */
    MAX_IT(screen.tlen[row], screen.cur.col);

  /*
   * If we wrote anywhere in the selected area, kill the selection
   * XXX: should we kill the mark too?  Possibly, but maybe that
   *      should be a similar check.
   */
  if (clearsel)
    CLEAR_SELECTION();

#ifdef DEBUG_STRICT
  assert(screen.cur.row >= 0);
#else                           /* drive with your eyes closed */
  MAX_IT(screen.cur.row, 0);
#endif
}

/* ------------------------------------------------------------------------- */
/*
 * Process Backspace.  Move back the cursor back a position, wrap if have to
 * XTERM_SEQ: CTRL-H
 */
void
rxvt_term::scr_backspace ()
{
  want_refresh = 1;
  if (screen.cur.col == 0)
    {
      if (screen.cur.row > 0)
        {
#ifdef TERMCAP_HAS_BW
          screen.cur.col = TermWin.ncol - 1;
          screen.cur.row--;
          return;
#endif

        }
    }
  else if ((screen.flags & Screen_WrapNext) == 0)
    scr_gotorc (0, -1, RELATIVE);
  screen.flags &= ~Screen_WrapNext;
}

/* ------------------------------------------------------------------------- */
/*
 * Process Horizontal Tab
 * count: +ve = forward; -ve = backwards
 * XTERM_SEQ: CTRL-I
 */
void
rxvt_term::scr_tab (int count)
{
  int             i, x;

  D_SCREEN((stderr, "rxvt_scr_tab(%d)", count));
  want_refresh = 1;
  i = x = screen.cur.col;
  if (count == 0)
    return;
  else if (count > 0)
    {
      for (; ++i < TermWin.ncol; )
        if (tabs[i])
          {
            x = i;
            if (!--count)
              break;
          }
      if (count)
        x = TermWin.ncol - 1;
    }
  else /* if (count < 0) */
    {
      for (; --i >= 0; )
        if (tabs[i])
          {
            x = i;
            if (!++count)
              break;
          }
      if (count)
        x = 0;
    }
  if (x != screen.cur.col)
    scr_gotorc (0, x, R_RELATIVE);
}

/* ------------------------------------------------------------------------- */
/*
 * Process DEC Back Index
 * XTERM_SEQ: ESC 6
 * Move cursor left in row.  If we're at the left boundary, shift everything
 * in that row right.  Clear left column.
 */
#ifndef NO_FRILLS
void
rxvt_term::scr_backindex ()
{
  if (screen.cur.col > 0)
    scr_gotorc (0, -1, R_RELATIVE | C_RELATIVE);
  else
    {
      if (screen.tlen[screen.cur.row + TermWin.saveLines] == 0)
        return;             /* um, yeah? */
      scr_insdel_chars (1, INSERT);
    }
}
#endif
/* ------------------------------------------------------------------------- */
/*
 * Process DEC Forward Index
 * XTERM_SEQ: ESC 9
 * Move cursor right in row.  If we're at the right boundary, shift everything
 * in that row left.  Clear right column.
 */
#ifndef NO_FRILLS
void
rxvt_term::scr_forwardindex ()
{
  int             row;

  if (screen.cur.col < TermWin.ncol - 1)
    scr_gotorc (0, 1, R_RELATIVE | C_RELATIVE);
  else
    {
      row = screen.cur.row + TermWin.saveLines;
      if (screen.tlen[row] == 0)
        return;             /* um, yeah? */
      else if (screen.tlen[row] == -1)
        screen.tlen[row] = TermWin.ncol;
      scr_gotorc (0, 0, R_RELATIVE);
      scr_insdel_chars (1, DELETE);
      scr_gotorc (0, TermWin.ncol - 1, R_RELATIVE);
    }
}
#endif

/* ------------------------------------------------------------------------- */
/*
 * Goto Row/Column
 */
void
rxvt_term::scr_gotorc (int row, int col, int relative)
{
  want_refresh = 1;
  ZERO_SCROLLBACK();
#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (0);
#endif

  D_SCREEN((stderr, "rxvt_scr_gotorc(r:%s%d,c:%s%d): from (r:%d,c:%d)", (relative & R_RELATIVE ? "+" : ""), row, (relative & C_RELATIVE ? "+" : ""), col, screen.cur.row, screen.cur.col));

  screen.cur.col = ((relative & C_RELATIVE) ? (screen.cur.col + col)
                    : col);
  MAX_IT(screen.cur.col, 0);
  MIN_IT(screen.cur.col, (int32_t)TermWin.ncol - 1);

  screen.flags &= ~Screen_WrapNext;
  if (relative & R_RELATIVE)
    {
      if (row > 0)
        {
          if (screen.cur.row <= screen.bscroll
              && (screen.cur.row + row) > screen.bscroll)
            screen.cur.row = screen.bscroll;
          else
            screen.cur.row += row;
        }
      else if (row < 0)
        {
          if (screen.cur.row >= screen.tscroll
              && (screen.cur.row + row) < screen.tscroll)
            screen.cur.row = screen.tscroll;
          else
            screen.cur.row += row;
        }
    }
  else
    {
      if (screen.flags & Screen_Relative)
        {        /* relative origin mode */
          screen.cur.row = row + screen.tscroll;
          MIN_IT(screen.cur.row, screen.bscroll);
        }
      else
        screen.cur.row = row;
    }
  MAX_IT(screen.cur.row, 0);
  MIN_IT(screen.cur.row, (int32_t)TermWin.nrow - 1);
}

/* ------------------------------------------------------------------------- */
/*
 * direction  should be UP or DN
 */
void
rxvt_term::scr_index (enum page_dirn direction)
{
  int             dirn;

  want_refresh = 1;
  dirn = ((direction == UP) ? 1 : -1);
  D_SCREEN((stderr, "rxvt_scr_index(%d)", dirn));

  ZERO_SCROLLBACK();

#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (0);
#endif

  screen.flags &= ~Screen_WrapNext;
  if ((screen.cur.row == screen.bscroll && direction == UP)
      || (screen.cur.row == screen.tscroll && direction == DN))
    scr_scroll_text(screen.tscroll, screen.bscroll, dirn, 0);
  else
    screen.cur.row += dirn;
  MAX_IT(screen.cur.row, 0);
  MIN_IT(screen.cur.row, (int32_t)TermWin.nrow - 1);
  selection_check (0);
}

/* ------------------------------------------------------------------------- */
/*
 * Erase part or whole of a line
 * XTERM_SEQ: Clear line to right: ESC [ 0 K
 * XTERM_SEQ: Clear line to left : ESC [ 1 K
 * XTERM_SEQ: Clear whole line   : ESC [ 2 K
 */
void
rxvt_term::scr_erase_line (int mode)
{
  unsigned int row, col, num;

  want_refresh = 1;
  D_SCREEN((stderr, "rxvt_scr_erase_line(%d) at screen row: %d", mode, screen.cur.row));
  ZERO_SCROLLBACK ();

#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (0);
#endif

  selection_check (1);

  screen.flags &= ~Screen_WrapNext;

  row = TermWin.saveLines + screen.cur.row;
  switch (mode)
    {
      case 0:                     /* erase to end of line */
        col = screen.cur.col;
        num = TermWin.ncol - col;
        MIN_IT(screen.tlen[row], (int16_t)col);
        if (ROWCOL_IN_ROW_AT_OR_AFTER(selection.beg, screen.cur)
            || ROWCOL_IN_ROW_AT_OR_AFTER(selection.end, screen.cur))
          CLEAR_SELECTION();
        break;
      case 1:                     /* erase to beginning of line */
        col = 0;
        num = screen.cur.col + 1;
        if (ROWCOL_IN_ROW_AT_OR_BEFORE(selection.beg, screen.cur)
            || ROWCOL_IN_ROW_AT_OR_BEFORE(selection.end, screen.cur))
          CLEAR_SELECTION();
        break;
      case 2:                     /* erase whole line */
        col = 0;
        num = TermWin.ncol;
        screen.tlen[row] = 0;
        if (selection.beg.row <= screen.cur.row
            && selection.end.row >= screen.cur.row)
          CLEAR_SELECTION();
        break;
      default:
        return;
    }

  if (screen.text[row])
    scr_blank_line (&(screen.text[row][col]),
                    &(screen.rend[row][col]), num, rstyle);
  else
    scr_blank_screen_mem (screen.text, screen.rend, row, rstyle);
}

/* ------------------------------------------------------------------------- */
/*
 * Erase part of whole of the screen
 * XTERM_SEQ: Clear screen after cursor : ESC [ 0 J
 * XTERM_SEQ: Clear screen before cursor: ESC [ 1 J
 * XTERM_SEQ: Clear whole screen        : ESC [ 2 J
 */
void
rxvt_term::scr_erase_screen (int mode)
{
  int             num;
  int32_t         row, row_offset;
  rend_t          ren;
  XGCValues       gcvalue;

  want_refresh = 1;
  D_SCREEN((stderr, "rxvt_scr_erase_screen(%d) at screen row: %d", mode, screen.cur.row));
  ZERO_SCROLLBACK ();
  row_offset = (int32_t)TermWin.saveLines;

  switch (mode)
    {
      case 0:                     /* erase to end of screen */
        selection_check (1);
        scr_erase_line (0);
        row = screen.cur.row + 1;    /* possible OOB */
        num = TermWin.nrow - row;
        break;
      case 1:                     /* erase to beginning of screen */
        selection_check (3);
        scr_erase_line (1);
        row = 0;
        num = screen.cur.row;
        break;
      case 2:                     /* erase whole screen */
        selection_check (3);
#ifdef RXVT_GRAPHICS
        Gr_ClearScreen ();
#endif
        row = 0;
        num = TermWin.nrow;
        break;
      default:
        return;
    }
  refresh_type |= REFRESH_BOUNDS;
  if (selection.op && current_screen == selection.screen
      && ((selection.beg.row >= row && selection.beg.row <= row + num)
          || (selection.end.row >= row
              && selection.end.row <= row + num)))
    CLEAR_SELECTION ();
  if (row >= TermWin.nrow) /* Out Of Bounds */
    return;
  MIN_IT(num, (TermWin.nrow - row));
  if (rstyle & (RS_RVid | RS_Uline))
    ren = (rend_t) ~RS_None;
  else if (GET_BASEBG(rstyle) == Color_bg)
    {
      ren = DEFAULT_RSTYLE;
      CLEAR_ROWS(row, num);
    }
  else
    {
      ren = (rstyle & (RS_fgMask | RS_bgMask));
      gcvalue.foreground = PixColors[GET_BGCOLOR(rstyle)];
      XChangeGC(Xdisplay, TermWin.gc, GCForeground, &gcvalue);
      ERASE_ROWS(row, num);
      gcvalue.foreground = PixColors[Color_fg];
      XChangeGC(Xdisplay, TermWin.gc, GCForeground, &gcvalue);
    }
  for (; num--; row++)
    {
      scr_blank_screen_mem (screen.text, screen.rend,
                            (unsigned int)(row + row_offset), rstyle);
      screen.tlen[row + row_offset] = 0;
      scr_blank_line (drawn_text[row], drawn_rend[row],
                      (unsigned int)TermWin.ncol, ren);
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Fill the screen with `E's
 * XTERM_SEQ: Screen Alignment Test: ESC # 8
 */
void
rxvt_term::scr_E ()
{
  int             i, j, k;
  rend_t         *r1, fs;

  want_refresh = 1;
  num_scr_allow = 0;
  ZERO_SCROLLBACK();
  selection_check (3);

  fs = SET_FONT (rstyle, TermWin.fontset->find_font ('E'));
  for (k = TermWin.saveLines, i = TermWin.nrow; i--; k++)
    {
      screen.tlen[k] = TermWin.ncol;    /* make the `E's selectable */
      fill_text (screen.text[k], 'E', TermWin.ncol);
      for (r1 = screen.rend[k], j = TermWin.ncol; j--; )
        *r1++ = fs;
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Insert/Delete <count> lines
 */
void
rxvt_term::scr_insdel_lines (int count, int insdel)
{
  int             end;

  ZERO_SCROLLBACK();

#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (0);
#endif

  selection_check (1);

  if (screen.cur.row > screen.bscroll)
    return;

  end = screen.bscroll - screen.cur.row + 1;
  if (count > end)
    {
      if (insdel == DELETE)
        return;
      else if (insdel == INSERT)
        count = end;
    }
  screen.flags &= ~Screen_WrapNext;

  scr_scroll_text(screen.cur.row, screen.bscroll, insdel * count, 0);
}

/* ------------------------------------------------------------------------- */
/*
 * Insert/Delete <count> characters from the current position
 */
void
rxvt_term::scr_insdel_chars (int count, int insdel)
{
  int             col, row;
  rend_t          tr;
  text_t         *stp;
  rend_t         *srp;
  int16_t        *slp;

  want_refresh = 1;
  ZERO_SCROLLBACK();

#ifdef RXVT_GRAPHICS
  if (Gr_Displayed ())
    Gr_scroll (0);
#endif

  if (count <= 0)
    return;

  selection_check (1);
  MIN_IT(count, (TermWin.ncol - screen.cur.col));

  row = screen.cur.row + TermWin.saveLines;
  screen.flags &= ~Screen_WrapNext;

  stp = screen.text[row];
  srp = screen.rend[row];
  slp = &(screen.tlen[row]);
  switch (insdel)
    {
      case INSERT:
        for (col = TermWin.ncol - 1; (col - count) >= screen.cur.col;
             col--)
          {
            stp[col] = stp[col - count];
            srp[col] = srp[col - count];
          }
        if (*slp != -1)
          {
            *slp += count;
            MIN_IT(*slp, TermWin.ncol);
          }
        if (selection.op && current_screen == selection.screen
            && ROWCOL_IN_ROW_AT_OR_AFTER(selection.beg, screen.cur))
          {
            if (selection.end.row != screen.cur.row
                || (selection.end.col + count >= TermWin.ncol))
              CLEAR_SELECTION();
            else
              {              /* shift selection */
                selection.beg.col += count;
                selection.mark.col += count; /* XXX: yes? */
                selection.end.col += count;
              }
          }
        scr_blank_line (&(stp[screen.cur.col]), &(srp[screen.cur.col]),
                        (unsigned int)count, rstyle);
        break;
      case ERASE:
        screen.cur.col += count;     /* don't worry if > TermWin.ncol */
        selection_check (1);
        screen.cur.col -= count;
        scr_blank_line (&(stp[screen.cur.col]), &(srp[screen.cur.col]),
                        (unsigned int)count, rstyle);
        break;
      case DELETE:
        tr = srp[TermWin.ncol - 1]
             & (RS_fgMask | RS_bgMask | RS_baseattrMask);
        for (col = screen.cur.col; (col + count) < TermWin.ncol; col++)
          {
            stp[col] = stp[col + count];
            srp[col] = srp[col + count];
          }
        scr_blank_line (&(stp[TermWin.ncol - count]),
                        &(srp[TermWin.ncol - count]),
                        (unsigned int)count, tr);
        if (*slp == -1) /* break line continuation */
          *slp = TermWin.ncol;
        *slp -= count;
        MAX_IT(*slp, 0);
        if (selection.op && current_screen == selection.screen
            && ROWCOL_IN_ROW_AT_OR_AFTER(selection.beg, screen.cur))
          {
            if (selection.end.row != screen.cur.row
                || (screen.cur.col >= selection.beg.col - count)
                || selection.end.col >= TermWin.ncol)
              CLEAR_SELECTION();
            else
              {
                /* shift selection */
                selection.beg.col -= count;
                selection.mark.col -= count; /* XXX: yes? */
                selection.end.col -= count;
              }
          }
        break;
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Set the scrolling region
 * XTERM_SEQ: Set region <top> - <bot> inclusive: ESC [ <top> ; <bot> r
 */
void
rxvt_term::scr_scroll_region (int top, int bot)
{
  MAX_IT(top, 0);
  MIN_IT(bot, (int)TermWin.nrow - 1);
  if (top > bot)
    return;
  screen.tscroll = top;
  screen.bscroll = bot;
  scr_gotorc (0, 0, 0);
}

/* ------------------------------------------------------------------------- */
/*
 * Make the cursor visible/invisible
 * XTERM_SEQ: Make cursor visible  : ESC [ ? 25 h
 * XTERM_SEQ: Make cursor invisible: ESC [ ? 25 l
 */
void
rxvt_term::scr_cursor_visible (int mode)
{
  want_refresh = 1;
  if (mode)
    screen.flags |= Screen_VisibleCursor;
  else
    screen.flags &= ~Screen_VisibleCursor;
}

/* ------------------------------------------------------------------------- */
/*
 * Set/unset automatic wrapping
 * XTERM_SEQ: Set Wraparound  : ESC [ ? 7 h
 * XTERM_SEQ: Unset Wraparound: ESC [ ? 7 l
 */
void
rxvt_term::scr_autowrap (int mode)
{
  if (mode)
    screen.flags |= Screen_Autowrap;
  else
    screen.flags &= ~(Screen_Autowrap | Screen_WrapNext);
}

/* ------------------------------------------------------------------------- */
/*
 * Set/unset margin origin mode
 * Absolute mode: line numbers are counted relative to top margin of screen
 *      and the cursor can be moved outside the scrolling region.
 * Relative mode: line numbers are relative to top margin of scrolling region
 *      and the cursor cannot be moved outside.
 * XTERM_SEQ: Set Absolute: ESC [ ? 6 h
 * XTERM_SEQ: Set Relative: ESC [ ? 6 l
 */
void
rxvt_term::scr_relative_origin (int mode)
{
  if (mode)
    screen.flags |= Screen_Relative;
  else
    screen.flags &= ~Screen_Relative;
  scr_gotorc (0, 0, 0);
}

/* ------------------------------------------------------------------------- */
/*
 * Set insert/replace mode
 * XTERM_SEQ: Set Insert mode : ESC [ ? 4 h
 * XTERM_SEQ: Set Replace mode: ESC [ ? 4 l
 */
void
rxvt_term::scr_insert_mode (int mode)
{
  if (mode)
    screen.flags |= Screen_Insert;
  else
    screen.flags &= ~Screen_Insert;
}

/* ------------------------------------------------------------------------- */
/*
 * Set/Unset tabs
 * XTERM_SEQ: Set tab at current column  : ESC H
 * XTERM_SEQ: Clear tab at current column: ESC [ 0 g
 * XTERM_SEQ: Clear all tabs             : ESC [ 3 g
 */
void
rxvt_term::scr_set_tab (int mode)
{
  if (mode < 0)
    MEMSET(tabs, 0, TermWin.ncol * sizeof(char));
  else if (screen.cur.col < TermWin.ncol)
    tabs[screen.cur.col] = (mode ? 1 : 0);
}

/* ------------------------------------------------------------------------- */
/*
 * Set reverse/normal video
 * XTERM_SEQ: Reverse video: ESC [ ? 5 h
 * XTERM_SEQ: Normal video : ESC [ ? 5 l
 */
void
rxvt_term::scr_rvideo_mode (int mode)
{
  XGCValues       gcvalue;

  if (rvideo != mode)
    {
      rvideo = mode;
      SWAP_IT(PixColors[Color_fg], PixColors[Color_bg], rxvt_color);
#if defined(XPM_BACKGROUND)
      if (bgPixmap.pixmap == None)
#endif
#if defined(TRANSPARENT)
        if (!(Options & Opt_transparent) || am_transparent == 0)
#endif
          XSetWindowBackground(Xdisplay, TermWin.vt,
                               PixColors[Color_bg]);

      gcvalue.foreground = PixColors[Color_fg];
      gcvalue.background = PixColors[Color_bg];
      XChangeGC(Xdisplay, TermWin.gc, GCBackground | GCForeground,
                &gcvalue);
      scr_clear ();
      scr_touch (true);
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Report current cursor position
 * XTERM_SEQ: Report position: ESC [ 6 n
 */
void
rxvt_term::scr_report_position ()
{
  tt_printf("\033[%d;%dR", screen.cur.row + 1, screen.cur.col + 1);
}

/* ------------------------------------------------------------------------- *
 *                                  FONTS                                    *
 * ------------------------------------------------------------------------- */

/*
 * Set font style
 */
void
rxvt_term::set_font_style ()
{
  switch (charsets[screen.charset])
    {
      case '0':                   /* DEC Special Character & Line Drawing Set */
        break;
      case 'A':                   /* United Kingdom (UK) */
        break;
      case 'B':                   /* United States (USASCII) */
        break;
      case '<':                   /* Multinational character set */
        break;
      case '5':                   /* Finnish character set */
        break;
      case 'C':                   /* Finnish character set */
        break;
      case 'K':                   /* German character set */
        break;
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Choose a font
 * XTERM_SEQ: Invoke G0 character set: CTRL-O
 * XTERM_SEQ: Invoke G1 character set: CTRL-N
 * XTERM_SEQ: Invoke G2 character set: ESC N
 * XTERM_SEQ: Invoke G3 character set: ESC O
 */
void
rxvt_term::scr_charset_choose (int set)
  {
    screen.charset = set;
    set_font_style ();
  }

/* ------------------------------------------------------------------------- */
/*
 * Set a font
 * XTERM_SEQ: Set G0 character set: ESC ( <C>
 * XTERM_SEQ: Set G1 character set: ESC ) <C>
 * XTERM_SEQ: Set G2 character set: ESC * <C>
 * XTERM_SEQ: Set G3 character set: ESC + <C>
 * See set_font_style for possible values for <C>
 */
void
rxvt_term::scr_charset_set (int set, unsigned int ch)
  {
    charsets[set] = (unsigned char)ch;
    set_font_style ();
  }


/* ------------------------------------------------------------------------- *
 *                        MAJOR SCREEN MANIPULATION                          *
 * ------------------------------------------------------------------------- */

/*
 * refresh matching text.
 */
bool
rxvt_term::scr_refresh_rend (rend_t mask, rend_t value)
{
  bool found = false;

  for (int i = 0; i < TermWin.nrow; i++)
    {
      int col = 0;
      rend_t *drp = drawn_rend [i];

      for (; col < TermWin.ncol; col++, drp++)
        if ((*drp & mask) == value)
          {
            found = true;
            *drp = ~value;
          }
    }

  return found;
}

/*
 * Refresh an area
 */
enum {
  PART_BEG = 0,
  PART_END,
  RC_COUNT
};

void
rxvt_term::scr_expose (int x, int y, int width, int height, bool refresh)
{
  int i;
  row_col_t rc[RC_COUNT];

  if (drawn_text == NULL)  /* sanity check */
    return;

#ifdef DEBUG_STRICT
  x = max(x, (int)TermWin.int_bwidth);
  x = min(x, (int)TermWin.width);
  y = max(y, (int)TermWin.int_bwidth);
  y = min(y, (int)TermWin.height);
#endif

  /* round down */
  rc[PART_BEG].col = Pixel2Col(x);
  rc[PART_BEG].row = Pixel2Row(y);
  /* round up */
  rc[PART_END].col = Pixel2Width(x + width + TermWin.fwidth - 1);
  rc[PART_END].row = Pixel2Row(y + height + TermWin.fheight - 1);

  /* sanity checks */
  for (i = PART_BEG; i < RC_COUNT; i++)
    {
      MIN_IT(rc[i].col, TermWin.ncol - 1);
      MIN_IT(rc[i].row, TermWin.nrow - 1);
    }

  D_SCREEN((stderr, "rxvt_scr_expose(x:%d, y:%d, w:%d, h:%d) area (c:%d,r:%d)-(c:%d,r:%d)", x, y, width, height, rc[PART_BEG].col, rc[PART_BEG].row, rc[PART_END].col, rc[PART_END].row));

  for (i = rc[PART_BEG].row; i <= rc[PART_END].row; i++)
    fill_text (&(drawn_text[i][rc[PART_BEG].col]), 0,
               (rc[PART_END].col - rc[PART_BEG].col + 1));

  if (refresh)
    scr_refresh (SLOW_REFRESH | REFRESH_BOUNDS);
}

/* ------------------------------------------------------------------------- */
/*
 * Refresh the entire screen
 */
void
rxvt_term::scr_touch (bool refresh)
{
  scr_expose (0, 0, TermWin.width, TermWin.height, refresh);
}

/* ------------------------------------------------------------------------- */
/*
 * Move the display so that the line represented by scrollbar value Y is at
 * the top of the screen
 */
int
rxvt_term::scr_move_to (int y, int len)
{
  long p = 0;
  uint16_t oldviewstart;

  oldviewstart = TermWin.view_start;
  if (y < len)
    {
      p = (TermWin.nrow + TermWin.nscrolled) * (len - y) / len;
      p -= (long)(TermWin.nrow - 1);
      p = max(p, 0);
    }
  TermWin.view_start = (uint16_t)min(p, TermWin.nscrolled);
  D_SCREEN((stderr, "rxvt_scr_move_to(%d, %d) view_start:%d", y, len, TermWin.view_start));

  return scr_changeview (oldviewstart);
}

/* ------------------------------------------------------------------------- */
/*
 * Page the screen up/down nlines
 * direction should be UP or DN
 */
int
rxvt_term::scr_page (enum page_dirn direction, int nlines)
{
  int             n;
  uint16_t       oldviewstart;

  D_SCREEN((stderr, "rxvt_scr_page(%s, %d) view_start:%d", ((direction == UP) ? "UP" : "DN"), nlines, TermWin.view_start));
#ifdef DEBUG_STRICT
  assert((nlines >= 0) && (nlines <= TermWin.nrow));
#endif
  oldviewstart = TermWin.view_start;
  if (direction == UP)
    {
      n = TermWin.view_start + nlines;
      TermWin.view_start = min(n, TermWin.nscrolled);
    }
  else
    {
      n = TermWin.view_start - nlines;
      TermWin.view_start = max(n, 0);
    }
  return scr_changeview (oldviewstart);
}

int
rxvt_term::scr_changeview (uint16_t oldviewstart)
{
  if (TermWin.view_start != oldviewstart)
    {
      want_refresh = 1;
#ifdef RXVT_GRAPHICS
      if (Gr_Displayed ())
        Gr_scroll (0);
#endif
      num_scr -= (TermWin.view_start - oldviewstart);
    }
  return (int)(TermWin.view_start - oldviewstart);
}

/* ------------------------------------------------------------------------- */
void
rxvt_term::scr_bell ()
{
#ifndef NO_BELL
# ifndef NO_MAPALERT
#  ifdef MAPALERT_OPTION
  if (Options & Opt_mapAlert)
#  endif
    XMapWindow(Xdisplay, TermWin.parent[0]);
# endif
  if (Options & Opt_visualBell)
    {
      scr_rvideo_mode (!rvideo); /* refresh also done */
      scr_rvideo_mode (!rvideo); /* refresh also done */
    }
  else
    XBell(Xdisplay, 0);
#endif
}

/* ------------------------------------------------------------------------- */
/* ARGSUSED */
void
rxvt_term::scr_printscreen (int fullhist)
{
#ifdef PRINTPIPE
  int             i, r1, nrows, row_offset;
  text_t         *t;
  FILE           *fd;

  if ((fd = popen_printer ()) == NULL)
    return;
  nrows = TermWin.nrow;
  row_offset = TermWin.saveLines;
  if (!fullhist)
    row_offset -= TermWin.view_start;
  else
    {
      nrows += TermWin.nscrolled;
      row_offset -= TermWin.nscrolled;
    }

  for (r1 = 0; r1 < nrows; r1++)
    {
      t = screen.text[r1 + row_offset];
      for (i = TermWin.ncol - 1; i >= 0; i--)
        if (!isspace(t[i]))
          break;
      fprintf(fd, "%.*s\n", (i + 1), t);
    }
  pclose_printer (fd);
#endif
}

/* ------------------------------------------------------------------------- */
/*
 * Refresh the screen
 * drawn_text/drawn_rend contain the screen information before the update.
 * screen.text/screen.rend contain what the screen will change to.
 */

#define FONT_WIDTH(X, Y)                                                \
    (X)->per_char[(Y) - (X)->min_char_or_byte2].width
#define FONT_RBEAR(X, Y)                                                \
    (X)->per_char[(Y) - (X)->min_char_or_byte2].rbearing
#define FONT_LBEAR(X, Y)                                                \
    (X)->per_char[(Y) - (X)->min_char_or_byte2].lbearing
#define IS_FONT_CHAR(X, Y)                                              \
    ((Y) >= (X)->min_char_or_byte2 && (Y) <= (X)->max_char_or_byte2)

void
rxvt_term::scr_refresh (unsigned char refresh_type)
{
  unsigned char   clearfirst, /* first character writes before cell        */
  clearlast,  /* last character writes beyond cell         */
  must_clear, /* use draw_string not draw_image_string     */
  rvid,       /* reverse video this position               */
  showcursor; /* show the cursor                           */
  int16_t         col, row,   /* column/row we're processing               */
  ocrow;      /* old cursor row                            */
  int             cursorwidth;
  int             i,          /* tmp                                       */
  row_offset; /* basic offset in screen structure          */
#ifndef NO_CURSORCOLOR
  rend_t          cc1;        /* store colours at cursor position(s)       */
#endif
  rend_t         *drp, *srp;  /* drawn-rend-pointer, screen-rend-pointer   */
  text_t         *dtp, *stp;  /* drawn-text-pointer, screen-text-pointer   */

  if (refresh_type == NO_REFRESH || !TermWin.mapped)
    return;

  /*
   * A: set up vars
   */
  clearfirst = clearlast = must_clear = 0;

  refresh_count = 0;

  row_offset = TermWin.saveLines - TermWin.view_start;

  if ((refresh_type & REFRESH_BOUNDS))
    {
      clearfirst = clearlast = 1;
      refresh_type &= ~REFRESH_BOUNDS;
    }

#ifdef XPM_BACKGROUND
  must_clear |= (bgPixmap.pixmap != None);
#endif
#ifdef TRANSPARENT
  must_clear |= ((Options & Opt_transparent) && am_transparent);
#endif
  ocrow = oldcursor.row; /* is there an old outline cursor on screen? */

  /*
   * B: reverse any characters which are selected
   */
  scr_reverse_selection ();

  /*
   * C: set the cursor character(s)
   */
  {
    unsigned char   setoldcursor;
    rend_t          ccol1,  /* Cursor colour       */
    ccol2;  /* Cursor colour2      */

    showcursor = (screen.flags & Screen_VisibleCursor);
    cursorwidth = 0;
#ifdef CURSOR_BLINK
    if (hidden_cursor)
      showcursor = 0;
#endif

    cursorwidth = 0;

    if (showcursor)
      {
        cursorwidth++;

        srp = &(screen.rend[screen.cur.row + TermWin.saveLines]
                [screen.cur.col]);

        if (showcursor && TermWin.focus)
          {
            *srp ^= RS_RVid;
#ifndef NO_CURSORCOLOR
            cc1 = *srp & (RS_fgMask | RS_bgMask);
            if (ISSET_PIXCOLOR (Color_cursor))
              ccol1 = Color_cursor;
            else
#ifdef CURSOR_COLOR_IS_RENDITION_COLOR
              ccol1 = GET_FGCOLOR(rstyle);
#else
              ccol1 = Color_fg;
#endif
            if (ISSET_PIXCOLOR (Color_cursor2))
              ccol2 = Color_cursor2;
            else
#ifdef CURSOR_COLOR_IS_RENDITION_COLOR
              ccol2 = GET_BGCOLOR(rstyle);
#else
              ccol2 = Color_bg;
#endif
            *srp = SET_FGCOLOR(*srp, ccol1);
            *srp = SET_BGCOLOR(*srp, ccol2);
#endif

          }
      }

    /* make sure no outline cursor is left around */
    setoldcursor = 0;
    if (ocrow != -1)
      {
        if (screen.cur.row + TermWin.view_start != ocrow
            || screen.cur.col != oldcursor.col)
          {
            if (ocrow < TermWin.nrow
                && oldcursor.col < TermWin.ncol)
              {
                drawn_rend[ocrow][oldcursor.col] ^= (RS_RVid | RS_Uline);
              }
            if (TermWin.focus || !showcursor)
              oldcursor.row = -1;
            else
              setoldcursor = 1;
          }
      }
    else if (!TermWin.focus)
      setoldcursor = 1;
    if (setoldcursor)
      {
        if (screen.cur.row + TermWin.view_start >= TermWin.nrow)
          oldcursor.row = -1;
        else
          {
            oldcursor.row = screen.cur.row + TermWin.view_start;
            oldcursor.col = screen.cur.col;
          }
      }
  }

#ifndef NO_SLOW_LINK_SUPPORT
  /*
   * D: CopyArea pass - very useful for slower links
   *    This has been deliberately kept simple.
   */
  i = num_scr;
  if (refresh_type == FAST_REFRESH && num_scr_allow && i
      && abs(i) < TermWin.nrow && !must_clear)
    {
      int16_t         nits;
      int             j;
      rend_t         *drp2;
      text_t         *dtp2;
      int             len, wlen;

      j = TermWin.nrow;
      wlen = len = -1;
      row = i > 0 ? 0 : j - 1;
      for (; j-- >= 0; row += (i > 0 ? 1 : -1))
        {
          if (row + i >= 0 && row + i < TermWin.nrow && row + i != ocrow)
            {
              stp = screen.text[row + row_offset];
              srp = screen.rend[row + row_offset];
              dtp = drawn_text[row];
              dtp2 = drawn_text[row + i];
              drp = drawn_rend[row];
              drp2 = drawn_rend[row + i];

              for (nits = 0, col = TermWin.ncol; col--; )
                if (stp[col] != dtp2[col] || srp[col] != drp2[col])
                  nits--;
                else if (stp[col] != dtp[col] || srp[col] != drp[col])
                  nits++;

              if (nits > 8) /* XXX: arbitrary choice */
                {
                  for (col = TermWin.ncol; col--; )
                    {
                      *dtp++ = *dtp2++;
                      *drp++ = *drp2++;
                    }

                  if (len == -1)
                    len = row;

                  wlen = row;
                  continue;
                }
            }

          if (len != -1)
            {
              /* also comes here at end if needed because of >= above */
              if (wlen < len)
                SWAP_IT(wlen, len, int);

              D_SCREEN((stderr, "rxvt_scr_refresh(): XCopyArea: %d -> %d (height: %d)", len + i, len, wlen - len + 1));
              XCopyArea (Xdisplay, TermWin.vt, TermWin.vt,
                         TermWin.gc, 0, Row2Pixel (len + i),
                         (unsigned int)TermWin_TotalWidth (),
                         (unsigned int)Height2Pixel (wlen - len + 1),
                         0, Row2Pixel (len));
              len = -1;
            }
        }
    }
#endif

  /*
   * E: main pass across every character
   */
  for (row = 0; row < TermWin.nrow; row++)
    {
      stp = screen.text[row + row_offset];
      srp = screen.rend[row + row_offset];
      dtp = drawn_text[row];
      drp = drawn_rend[row];

      /*
       * E2: OK, now the real pass
       */
      int ypixel = (int)Row2Pixel(row);

      for (col = 0; col < TermWin.ncol; col++)
        {
          /* compare new text with old - if exactly the same then continue */
          rend_t rend = srp[col];     /* screen rendition (target rendtion) */

          if (stp[col] == dtp[col]    /* Must match characters to skip. */
              && (rend == drp[col]    /* Either rendition the same or   */
                  || (stp[col] == ' ' /* space w/ no background change  */
                      && GET_BGATTR(rend) == GET_BGATTR(drp[col]))))
            continue;

          text_t *text = stp + col;
          int count = 1;

          /* redraw one or more characters */

          dtp[col] = stp[col];
          drp[col] = rend;

          if (*text == NOCHAR) // never start redrawing at invisible characters. */
            continue;

          int xpixel = Col2Pixel(col);

          // this loop looks very messy, it can probably be optimized
          // and cleaned a bit by you?
          for (i = 0; ++col < TermWin.ncol; )
            {
              if (stp[col] == NOCHAR)
                {
                  dtp[col] = stp[col];
                  drp[col] = rend;
                  count++;

                  if (i) // only possible skip if char unchanged
                    i++;

                  continue;
                }

              if (rend != srp[col])
                break;

              count++;

              if (stp[col] != dtp[col]
                  || srp[col] != drp[col])
                {
                  if (must_clear && (i++ > (count / 2)))
                    break;

                  dtp[col] = stp[col];
                  drp[col] = rend;
                  i = 0;
                }
              else if (must_clear || (stp[col] != ' ' && ++i >= 32))
                break;
            }

          col--;      /* went one too far.  move back */
          count -= i; /* dump any matching trailing chars */

          /*
           * Determine the attributes for the string
           */
          int fid = GET_FONT (rend);
          int fore = GET_FGCOLOR (rend); // desired foreground
          int back = GET_BGCOLOR (rend); // desired background

          rend = GET_ATTR (rend);

          rvid = !!(rend & RS_RVid);
          if (rvid)
            {
              SWAP_IT(fore, back, int);

#ifndef NO_BOLD_UNDERLINE_REVERSE
              if (ISSET_PIXCOLOR (Color_RV)
# ifndef NO_CURSORCOLOR
                  && !ISSET_PIXCOLOR (Color_cursor)
# endif
                 )
                back = Color_RV;
#endif

            }
#ifdef TEXT_BLINK
          if (rend & RS_Blink)
            {
              if (!text_blink_ev.active)
                {
                  text_blink_ev.start (NOW + TEXT_BLINK_INTERVAL);
                  hidden_text = 0;
                }
              else if (hidden_text)
                fore = back;
            }
#endif
#ifndef NO_BOLD_UNDERLINE_REVERSE
          else if (rend & RS_Bold)
            {
              if (ISSET_PIXCOLOR (Color_BD))
                fore = Color_BD;
              else if (fore == Color_fg)
                fore = Color_White;
            }
          else if (rend & RS_Uline)
            {
              if (ISSET_PIXCOLOR (Color_UL))
                fore = Color_UL;
            }
#endif

          /*
           * Actually do the drawing of the string here
           */
          rxvt_font *font = (*TermWin.fontset)[fid];

          if (back == fore)
            font->clear_rect (xpixel, ypixel,
                              TermWin.fwidth * count, TermWin.fheight,
                              back);
          else if (back == Color_bg)
            {
              if (must_clear)
                {
                  CLEAR_CHARS (xpixel, ypixel, count);

                  for (i = 0; i < count; i++) /* don't draw empty strings */
                    if (text[i] != ' ')
                      {
                        font->draw (xpixel, ypixel, text, count, fore, -1);
                        break;
                      }
                }
              else
                font->draw (xpixel, ypixel, text, count, fore, Color_bg);
            }
          else
            font->draw (xpixel, ypixel, text, count, fore, back);

          if ((rend & RS_Uline) && (font->descent > 1))
            XDrawLine(Xdisplay, drawBuffer, TermWin.gc,
                      xpixel, ypixel + font->ascent + 1,
                      xpixel + Width2Pixel(count) - 1, ypixel + font->ascent + 1);
        }                     /* for (col....) */
    }                         /* for (row....) */

  /*
   * G: cleanup cursor and display outline cursor if necessary
   */
  if (showcursor)
    {
      if (TermWin.focus)
        {
          srp = &(screen.rend[screen.cur.row + TermWin.saveLines]
                  [screen.cur.col]);
          *srp ^= RS_RVid;
#ifndef NO_CURSORCOLOR
          *srp = (*srp & ~(RS_fgMask | RS_bgMask)) | cc1;
#endif

        }
      else if (oldcursor.row >= 0)
        {
#ifndef NO_CURSORCOLOR
          if (ISSET_PIXCOLOR (Color_cursor))
            XSetForeground (Xdisplay, TermWin.gc, PixColors[Color_cursor]);
#endif
          XDrawRectangle(Xdisplay, drawBuffer, TermWin.gc,
                         Col2Pixel(oldcursor.col),
                         Row2Pixel(oldcursor.row),
                         (unsigned int)(Width2Pixel(cursorwidth) - 1),
                         (unsigned int)(Height2Pixel(1) - TermWin.lineSpace - 1));
        }
    }

  /*
   * H: cleanup selection
   */
  scr_reverse_selection ();

  /*
   * I: other general cleanup
   */
  if (clearfirst && TermWin.int_bwidth)
    /*
     * clear the whole screen height, note that width == 0 is treated
     * specially by XClearArea
     */
    XClearArea(Xdisplay, TermWin.vt, 0, 0,
               (unsigned int)TermWin.int_bwidth,
               (unsigned int)TermWin_TotalHeight(), False);
  if (clearlast && TermWin.int_bwidth)
    /*
     * clear the whole screen height, note that width == 0 is treated
     * specially by XClearArea
     */
    XClearArea(Xdisplay, TermWin.vt,
               TermWin.width + TermWin.int_bwidth, 0,
               (unsigned int)TermWin.int_bwidth,
               (unsigned int)TermWin_TotalHeight(), False);
  if (refresh_type & SMOOTH_REFRESH)
    XSync(Xdisplay, False);

  num_scr = 0;
  num_scr_allow = 1;
  want_refresh = 0;        /* screen is current */
}

/* ------------------------------------------------------------------------- */
void
rxvt_term::scr_clear()
{
  if (!TermWin.mapped)
    return;

  num_scr_allow = 0;
  want_refresh = 1;
#ifdef TRANSPARENT
  if ((Options & Opt_transparent) && (am_pixmap_trans == 0))
    {
      int i;

      if (!(Options & Opt_transparent_all))
        i = 0;
      else
        i = (int)(sizeof(TermWin.parent) / sizeof(Window));

      while (i--)
        if (TermWin.parent[i] != None)
          XClearWindow(Xdisplay, TermWin.parent[i]);
    }
#endif

  XClearWindow (Xdisplay, TermWin.vt);
}

/* ------------------------------------------------------------------------- */
void
rxvt_term::scr_reverse_selection ()
{
  int             i, col, row, end_row;
  rend_t         *srp;

  if (selection.op && current_screen == selection.screen)
    {
      end_row = TermWin.saveLines - TermWin.view_start;
      i = selection.beg.row + TermWin.saveLines;
      row = selection.end.row + TermWin.saveLines;
      if (i >= end_row)
        col = selection.beg.col;
      else
        {
          col = 0;
          i = end_row;
        }
      end_row += TermWin.nrow;
      for (; i < row && i < end_row; i++, col = 0)
        for (srp = screen.rend[i]; col < TermWin.ncol; col++)
          srp[col] ^= RS_RVid;
      if (i == row && i < end_row)
        for (srp = screen.rend[i]; col < selection.end.col; col++)
          srp[col] ^= RS_RVid;
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Dump the whole scrollback and screen to the passed filedescriptor.  The
 * invoking routine must close the fd.
 */
#if 0
void
rxvt_term::scr_dump (int fd)
{
  int             row, wrote;
  unsigned int    width, towrite;
  char            r1[] = "\n";

  for (row = TermWin.saveLines - TermWin.nscrolled;
       row < TermWin.saveLines + TermWin.nrow - 1; row++)
    {
      width = screen.tlen[row] >= 0 ? screen.tlen[row]
              : TermWin.ncol;
      for (towrite = width; towrite; towrite -= wrote)
        {
          wrote = write(fd, &(screen.text[row][width - towrite]),
                        towrite);
          if (wrote < 0)
            return;         /* XXX: death, no report */
        }
      if (screen.tlen[row] >= 0)
        if (write(fd, r1, 1) <= 0)
          return; /* XXX: death, no report */
    }
}
#endif

/* ------------------------------------------------------------------------- *
 *                           CHARACTER SELECTION                             *
 * ------------------------------------------------------------------------- */

/*
 * -TermWin.nscrolled <= (selection row) <= TermWin.nrow - 1
 */
void
rxvt_term::selection_check (int check_more)
{
  row_col_t       pos;

  if (!selection.op)
    return;

  pos.row = pos.col = 0;
  if ((selection.beg.row < -(int32_t)TermWin.nscrolled)
      || (selection.beg.row >= TermWin.nrow)
      || (selection.mark.row < -(int32_t)TermWin.nscrolled)
      || (selection.mark.row >= TermWin.nrow)
      || (selection.end.row < -(int32_t)TermWin.nscrolled)
      || (selection.end.row >= TermWin.nrow)
      || (check_more == 1
          && current_screen == selection.screen
          && !ROWCOL_IS_BEFORE(screen.cur, selection.beg)
          && ROWCOL_IS_BEFORE(screen.cur, selection.end))
      || (check_more == 2
          && ROWCOL_IS_BEFORE(selection.beg, pos)
          && ROWCOL_IS_AFTER(selection.end, pos))
      || (check_more == 3
          && ROWCOL_IS_AFTER(selection.end, pos))
      || (check_more == 4     /* screen width change */
          && (selection.beg.row != selection.end.row
              || selection.end.col > TermWin.ncol)))
    CLEAR_SELECTION();
}

/* ------------------------------------------------------------------------- */
/*
 * Paste a selection direct to the command fd
 */
void
rxvt_term::paste (const unsigned char *data, unsigned int len)
{
  unsigned int i, j, n;
  unsigned char *ds = (unsigned char *)rxvt_malloc (PROP_SIZE);

#if 0
  /* a paste should act like the user is typing, so check scrollTtyKeypress */
  ZERO_SCROLLBACK (r);
#endif

  /* convert normal newline chars into common keyboard Return key sequence */
  for (i = 0; i < len; i += PROP_SIZE)
    {
      n = min (len - i, PROP_SIZE);
      MEMCPY (ds, data + i, n);

      for (j = 0; j < n; j++)
        if (ds[j] == '\n')
          ds[j] = '\r';

      tt_write (ds, (int)n);
    }

  free(ds);
}

/* ------------------------------------------------------------------------- */
/*
 * Respond to a notification that a primary selection has been sent
 * EXT: SelectionNotify
 */
int
rxvt_term::selection_paste (Window win, Atom prop, bool delete_prop)
{
  long nread = 0;
  unsigned long bytes_after;
  XTextProperty ct;

  D_SELECT((stderr, "rxvt_selection_paste(%08lx, %lu, %d), wait=%2x", win, (unsigned long)prop, (int)delete_prop, selection_wait));

  if (prop == None)         /* check for failed XConvertSelection */
    {
      if ((selection_type & Sel_CompoundText))
        {
          int selnum = selection_type & Sel_whereMask;

          selection_type = 0;
          if (selnum != Sel_direct)
            selection_request_other (XA_STRING, selnum);
        }

      if ((selection_type & Sel_UTF8String))
        {
          int selnum = selection_type & Sel_whereMask;

          selection_type = Sel_CompoundText;
          if (selnum != Sel_direct)
            selection_request_other (xa[XA_COMPOUND_TEXT], selnum);
          else
            selection_type = 0;
        }

      return 0;
    }

  for (;;)
    {
      if (XGetWindowProperty(Xdisplay, win, prop, (long)(nread / 4),
                             (long)(PROP_SIZE / 4), delete_prop,
                             AnyPropertyType, &ct.encoding, &ct.format,
                             &ct.nitems, &bytes_after,
                             &ct.value) != Success)
        break;

      if (ct.encoding == 0)
        {
          D_SELECT((stderr, "rxvt_selection_paste: property didn't exist!"));
          break;
        }

      if (ct.value == NULL)
        {
          D_SELECT((stderr, "rxvt_selection_paste: property shooting blanks!"));
          continue;
        }

      if (ct.nitems == 0)
        {
          D_SELECT((stderr, "rxvt_selection_paste: property empty - also INCR end"));
          if (selection_wait == Sel_normal && nread == 0)
            {
              /*
               * pass through again trying CUT_BUFFER0 if we've come from
               * XConvertSelection() but nothing was presented
               */
              D_SELECT((stderr, "rxvt_selection_request: pasting CUT_BUFFER0"));
              selection_paste (Xroot, XA_CUT_BUFFER0, False);
            }

          nread = -1;         /* discount any previous stuff */
          break;
        }

      nread += ct.nitems;

      char **cl;
      int cr;
      if (XmbTextPropertyToTextList (Xdisplay, &ct, &cl,
                                     &cr) >= 0 && cl)
        {
          for (int i = 0; i < cr; i++)
            paste ((unsigned char *)cl[i], STRLEN (cl[i]));

          XFreeStringList (cl);
        }
      else
        paste (ct.value, ct.nitems);

      if (bytes_after == 0)
        break;

      XFree (ct.value);
    }

  if (ct.value)
    XFree (ct.value);

  if (selection_wait == Sel_normal)
    selection_wait = Sel_none;

  D_SELECT((stderr, "rxvt_selection_paste: bytes written: %ld", nread));
  return (int)nread;
}

void
rxvt_term::incr_cb (time_watcher &w)
{
  selection_wait = Sel_none;

  rxvt_print_error ("data loss: timeout on INCR selection paste");
}

/*
 * INCR support originally provided by Paul Sheer <psheer@obsidian.co.za>
 */
void
rxvt_term::selection_property (Window win, Atom prop)
{
  int             reget_time = 0;

  if (prop == None)
    return;
  D_SELECT((stderr, "rxvt_selection_property(%08lx, %lu)", win, (unsigned long)prop));
  if (selection_wait == Sel_normal)
    {
      int             a, afmt;
      Atom            atype;
      unsigned long   bytes_after, nitems;
      unsigned char  *s = NULL;

      a = XGetWindowProperty(Xdisplay, win, prop, 0L, 1L, False,
                             xa[XA_INCR], &atype, &afmt, &nitems,
                             &bytes_after, &s);
      if (s)
        XFree(s);
      if (a != Success)
        return;
#ifndef __CYGWIN32__
      if (atype == xa[XA_INCR])
        {  /* start an INCR transfer */
          D_SELECT((stderr, "rxvt_selection_property: INCR: starting transfer"));
          XDeleteProperty(Xdisplay, win, prop);
          XFlush(Xdisplay);
          reget_time = 1;
          selection_wait = Sel_incr;
        }
#endif

    }
  else if (selection_wait == Sel_incr)
    {
      reget_time = 1;
      if (selection_paste (win, prop, True) == -1)
        {
          D_SELECT((stderr, "rxvt_selection_property: INCR: clean end"));
          selection_wait = Sel_none;
          incr_ev.stop ();
        }
    }
  if (reget_time) /* received more data so reget time */
    incr_ev.start (NOW + 10);
}
/* ------------------------------------------------------------------------- */
/*
 * Request the current selection: 
 * Order: > internal selection if available
 *        > PRIMARY, SECONDARY, CLIPBOARD if ownership is claimed (+)
 *        > CUT_BUFFER0
 * (+) if ownership is claimed but property is empty, rxvt_selection_paste()
 *     will auto fallback to CUT_BUFFER0
 * EXT: button 2 release
 */
void
rxvt_term::selection_request (Time tm, int x, int y)
{
  D_SELECT((stderr, "rxvt_selection_request(%lu, %d, %d)", tm, x, y));
  if (x < 0 || x >= TermWin.width || y < 0 || y >= TermWin.height)
    return;                 /* outside window */

  if (selection.text != NULL)
    {    /* internal selection */
      D_SELECT((stderr, "rxvt_selection_request: pasting internal"));
      paste (selection.text, selection.len);
      return;
    }
  else
    {
      int             i;

      selection_request_time = tm;
      selection_wait = Sel_normal;
      for (i = Sel_Primary; i <= Sel_Clipboard; i++)
        {
#if X_HAVE_UTF8_STRING
          selection_type = Sel_UTF8String;
          if (selection_request_other (xa[XA_UTF8_STRING], i))
            return;
#else
          selection_type = Sel_CompoundText;
          if (selection_request_other (xa[XA_COMPOUND_TEXT], i))
            return;
#endif

        }
    }
  selection_wait = Sel_none;       /* don't loop in rxvt_selection_paste() */
  D_SELECT((stderr, "rxvt_selection_request: pasting CUT_BUFFER0"));
  selection_paste (Xroot, XA_CUT_BUFFER0, False);
}

int
rxvt_term::selection_request_other (Atom target, int selnum)
{
  Atom            sel;
#ifdef DEBUG_SELECT
  char           *debug_xa_names[] = { "PRIMARY", "SECONDARY", "CLIPBOARD" };
#endif

  selection_type |= selnum;
  if (selnum == Sel_Primary)
    sel = XA_PRIMARY;
  else if (selnum == Sel_Secondary)
    sel = XA_SECONDARY;
  else
    sel = xa[XA_CLIPBOARD];
  if (XGetSelectionOwner(Xdisplay, sel) != None)
    {
      D_SELECT((stderr, "rxvt_selection_request_other: pasting %s", debug_xa_names[selnum]));
      XConvertSelection(Xdisplay, sel, target, xa[XA_VT_SELECTION],
                        TermWin.vt, selection_request_time);
      return 1;
    }
  return 0;
}

/* ------------------------------------------------------------------------- */
/*
 * Clear all selected text
 * EXT: SelectionClear
 */
void
rxvt_term::selection_clear ()
{
  D_SELECT((stderr, "rxvt_selection_clear()"));

  want_refresh = 1;
  if (selection.text)
    free(selection.text);
  selection.text = NULL;
  selection.len = 0;
  CLEAR_SELECTION();
}

/* ------------------------------------------------------------------------- */
/*
 * Copy a selection into the cut buffer
 * EXT: button 1 or 3 release
 */
void
rxvt_term::selection_make (Time tm)
{
  int             i, col, end_col, row, end_row;
  unsigned char  *new_selection_text;
  char           *str;
  text_t         *t;
#ifdef ACS_ASCII
  rend_t         *re;
#endif

  D_SELECT((stderr, "rxvt_selection_make(): selection.op=%d, selection.clicks=%d", selection.op, selection.clicks));
  switch (selection.op)
    {
      case SELECTION_CONT:
        break;
      case SELECTION_INIT:
        CLEAR_SELECTION();
        /* FALLTHROUGH */
      case SELECTION_BEGIN:
        selection.op = SELECTION_DONE;
        /* FALLTHROUGH */
      default:
        return;
    }
  selection.op = SELECTION_DONE;

  if (selection.clicks == 4)
    return;                 /* nothing selected, go away */

  i = (selection.end.row - selection.beg.row + 1) * (TermWin.ncol + 1) + 1;
  str = (char *)rxvt_malloc(i * MB_CUR_MAX + 1);

  new_selection_text = (unsigned char *)str;

  col = selection.beg.col;
  MAX_IT(col, 0);
  row = selection.beg.row + TermWin.saveLines;
  end_row = selection.end.row + TermWin.saveLines;

  for (; row <= end_row; row++, col = 0)
    {
      t = &(screen.text[row][col]);

      end_col = screen.tlen[row];

      if (end_col == -1)
        end_col = TermWin.ncol;

      if (row == end_row)
        MIN_IT (end_col, selection.end.col);

      for (; col < end_col; col++)
        if (*t == NOCHAR)
          t++;
        else
          {
            int len = wctomb (str, *t++);
            if (len > 0)
              str += len;
          }

      if (screen.tlen[row] != -1 && row != end_row)
        *str++ = '\n';
    }

#ifndef NO_OLD_SELECTION
  if (selection_style == OLD_SELECT)
    if (end_col == TermWin.ncol)
      *str++ = '\n';
#endif
#ifndef NO_NEW_SELECTION
  if (selection_style != OLD_SELECT)
    if (end_col != selection.end.col)
      *str++ = '\n';
#endif
  *str = '\0';

  i = str - (char *)new_selection_text;
  if (i == 0)
    {
      free (new_selection_text);
      return;
    }

  // due to MB_MAX_CUR, selection wastage is usually high, so realloc
  if (str - (char *)new_selection_text > 1024)
    new_selection_text = (unsigned char *)rxvt_realloc (new_selection_text, i + 1);

  selection.len = i;

  if (selection.text)
    free (selection.text);

  selection.text = new_selection_text;

  XSetSelectionOwner(Xdisplay, XA_PRIMARY, TermWin.vt, tm);
  if (XGetSelectionOwner(Xdisplay, XA_PRIMARY) != TermWin.vt)
    rxvt_print_error("can't get primary selection");


  {
    XTextProperty ct;
    char *cl = (char *)selection.text;

    if (XmbTextListToTextProperty(Xdisplay, &cl, 1, XStringStyle, &ct) >= 0)
      {
        XChangeProperty(Xdisplay, Xroot, XA_CUT_BUFFER0, XA_STRING, 8,
                        PropModeReplace, ct.value, ct.nitems);
        XFree (ct.value);
      }
    else
      XChangeProperty(Xdisplay, Xroot, XA_CUT_BUFFER0, XA_STRING, 8,
                      PropModeReplace, selection.text, (int)selection.len);
  }

  selection_time = tm;
  D_SELECT((stderr, "rxvt_selection_make(): selection.len=%d", selection.len));
}

/* ------------------------------------------------------------------------- */
/*
 * Mark or select text based upon number of clicks: 1, 2, or 3
 * EXT: button 1 press
 */
void
rxvt_term::selection_click (int clicks, int x, int y)
{
  D_SELECT((stderr, "rxvt_selection_click(%d, %d, %d)", clicks, x, y));

  clicks = ((clicks - 1) % 3) + 1;
  selection.clicks = clicks;       /* save clicks so extend will work */

  selection_start_colrow (Pixel2Col(x), Pixel2Row(y));

  if (clicks == 2 || clicks == 3)
    selection_extend_colrow (selection.mark.col,
                             selection.mark.row + TermWin.view_start,
                             0, /* button 3     */
                             1, /* button press */
                             0);        /* click change */
}

/* ------------------------------------------------------------------------- */
/*
 * Mark a selection at the specified col/row
 */
void
rxvt_term::selection_start_colrow (int col, int row)
{
  want_refresh = 1;
  selection.mark.col = col;
  selection.mark.row = row - TermWin.view_start;
  MAX_IT(selection.mark.row, -(int32_t)TermWin.nscrolled);
  MIN_IT(selection.mark.row, (int32_t)TermWin.nrow - 1);
  MAX_IT(selection.mark.col, 0);
  MIN_IT(selection.mark.col, (int32_t)TermWin.ncol - 1);

  if (selection.op)
    {      /* clear the old selection */
      selection.beg.row = selection.end.row = selection.mark.row;
      selection.beg.col = selection.end.col = selection.mark.col;
    }
  selection.op = SELECTION_INIT;
  selection.screen = current_screen;
}

/* ------------------------------------------------------------------------- */
/*
 * Word select: select text for 2 clicks
 * We now only find out the boundary in one direction
 */

/* what do we want: spaces/tabs are delimiters or cutchars or non-cutchars */
#define DELIMIT_TEXT(x) \
    (((x) == ' ' || (x) == '\t') ? 2 : (STRCHR(rs[Rs_cutchars], (x)) != NULL))
#define DELIMIT_REND(x)        1

void
rxvt_term::selection_delimit_word (enum page_dirn dirn, const row_col_t *mark, row_col_t *ret)
{
  int             col, row, dirnadd, tcol, trow, w1, w2;
  row_col_t       bound;
  text_t         *stp;
  rend_t         *srp;

  if (dirn == UP)
    {
      bound.row = TermWin.saveLines - TermWin.nscrolled - 1;
      bound.col = 0;
      dirnadd = -1;
    }
  else
    {
      bound.row = TermWin.saveLines + TermWin.nrow;
      bound.col = TermWin.ncol - 1;
      dirnadd = 1;
    }
  row = mark->row + TermWin.saveLines;
  col = mark->col;
  MAX_IT(col, 0);
  /* find the edge of a word */
  stp = &(screen.text[row][col]);
  w1 = DELIMIT_TEXT(*stp);

  if (selection_style != NEW_SELECT)
    {
      if (w1 == 1)
        {
          stp += dirnadd;
          if (DELIMIT_TEXT(*stp) == 1)
            goto Old_Word_Selection_You_Die;
          col += dirnadd;
        }
      w1 = 0;
    }
  srp = (&screen.rend[row][col]);
  w2 = DELIMIT_REND(*srp);

  for (;;)
    {
      for (; col != bound.col; col += dirnadd)
        {
          stp += dirnadd;
          if (DELIMIT_TEXT(*stp) != w1)
            break;
          srp += dirnadd;
          if (DELIMIT_REND(*srp) != w2)
            break;
        }
      if ((col == bound.col) && (row != bound.row))
        {
          if (screen.tlen[(row - (dirn == UP ? 1 : 0))] == -1)
            {
              trow = row + dirnadd;
              tcol = dirn == UP ? TermWin.ncol - 1 : 0;
              if (screen.text[trow] == NULL)
                break;
              stp = &(screen.text[trow][tcol]);
              srp = &(screen.rend[trow][tcol]);
              if (DELIMIT_TEXT(*stp) != w1 || DELIMIT_REND(*srp) != w2)
                break;
              row = trow;
              col = tcol;
              continue;
            }
        }
      break;
    }
Old_Word_Selection_You_Die:
  D_SELECT((stderr, "rxvt_selection_delimit_word(%s,...) @ (r:%3d, c:%3d) has boundary (r:%3d, c:%3d)", (dirn == UP ? "up     " : "down"), mark->row, mark->col, row - TermWin.saveLines, col));

  if (dirn == DN)
    col++;                  /* put us on one past the end */

  /* Poke the values back in */
  ret->row = row - TermWin.saveLines;
  ret->col = col;
}

/* ------------------------------------------------------------------------- */
/*
 * Extend the selection to the specified x/y pixel location
 * EXT: button 3 press; button 1 or 3 drag
 * flag == 0 ==> button 1
 * flag == 1 ==> button 3 press
 * flag == 2 ==> button 3 motion
 */
void
rxvt_term::selection_extend (int x, int y, int flag)
{
  int col, row;

  col = Pixel2Col(x);
  row = Pixel2Row(y);
  MAX_IT(row, 0);
  MIN_IT(row, (int)TermWin.nrow - 1);
  MAX_IT(col, 0);
  MIN_IT(col, (int)TermWin.ncol);

#ifndef NO_NEW_SELECTION
  /*
  * If we're selecting characters (single click) then we must check first
  * if we are at the same place as the original mark.  If we are then
  * select nothing.  Otherwise, if we're to the right of the mark, you have to
  * be _past_ a character for it to be selected.
  */
  if (selection_style != OLD_SELECT)
    {
      if (((selection.clicks % 3) == 1) && !flag
          && (col == selection.mark.col
              && (row == selection.mark.row + TermWin.view_start)))
        {
          /* select nothing */
          selection.beg.row = selection.end.row = 0;
          selection.beg.col = selection.end.col = 0;
          selection.clicks = 4;
          want_refresh = 1;
          D_SELECT((stderr, "rxvt_selection_extend() selection.clicks = 4"));
          return;
        }
    }
#endif
  if (selection.clicks == 4)
    selection.clicks = 1;

  selection_extend_colrow (col, row, !!flag,  /* ? button 3      */
                           flag == 1 ? 1 : 0,     /* ? button press  */
                           0);    /* no click change */
}

/* ------------------------------------------------------------------------- */
/*
 * Extend the selection to the specified col/row
 */
void
rxvt_term::selection_extend_colrow (int32_t col, int32_t row, int button3, int buttonpress, int clickchange)
{
  int16_t         ncol = TermWin.ncol;
  int             end_col;
  row_col_t       pos;
  enum {
    LEFT, RIGHT
  } closeto = RIGHT;

  D_SELECT((stderr, "rxvt_selection_extend_colrow(c:%d, r:%d, %d, %d) clicks:%d, op:%d", col, row, button3, buttonpress, selection.clicks, selection.op));
  D_SELECT((stderr, "rxvt_selection_extend_colrow() ENT  b:(r:%d,c:%d) m:(r:%d,c:%d), e:(r:%d,c:%d)", selection.beg.row, selection.beg.col, selection.mark.row, selection.mark.col, selection.end.row, selection.end.col));

  want_refresh = 1;
  switch (selection.op)
    {
      case SELECTION_INIT:
        CLEAR_SELECTION();
        selection.op = SELECTION_BEGIN;
        /* FALLTHROUGH */
      case SELECTION_BEGIN:
        if (row != selection.mark.row || col != selection.mark.col
            || (!button3 && buttonpress))
          selection.op = SELECTION_CONT;
        break;
      case SELECTION_DONE:
        selection.op = SELECTION_CONT;
        /* FALLTHROUGH */
      case SELECTION_CONT:
        break;
      case SELECTION_CLEAR:
        selection_start_colrow (col, row);
        /* FALLTHROUGH */
      default:
        return;
    }
  if (selection.beg.col == selection.end.col
      && selection.beg.col != selection.mark.col
      && selection.beg.row == selection.end.row
      && selection.beg.row != selection.mark.row)
    {
      selection.beg.col = selection.end.col = selection.mark.col;
      selection.beg.row = selection.end.row = selection.mark.row;
      D_SELECT((stderr, "rxvt_selection_extend_colrow() ENT2 b:(r:%d,c:%d) m:(r:%d,c:%d), e:(r:%d,c:%d)", selection.beg.row, selection.beg.col, selection.mark.row, selection.mark.col, selection.end.row, selection.end.col));
    }

  pos.col = col;
  pos.row = row;

  pos.row -= TermWin.view_start;   /* adjust for scroll */

#ifndef NO_OLD_SELECTION
  /*
   * This mimics some of the selection behaviour of version 2.20 and before.
   * There are no ``selection modes'', button3 is always character extension.
   * Note: button3 drag is always available, c.f. v2.20
   * Selection always terminates (left or right as appropriate) at the mark.
   */
  if (selection_style == OLD_SELECT)
    {
      if (selection.clicks == 1 || button3)
        {
          if (hate_those_clicks)
            {
              hate_those_clicks = 0;
              if (selection.clicks == 1)
                {
                  selection.beg.row = selection.mark.row;
                  selection.beg.col = selection.mark.col;
                }
              else
                {
                  selection.mark.row = selection.beg.row;
                  selection.mark.col = selection.beg.col;
                }
            }
          if (ROWCOL_IS_BEFORE(pos, selection.mark))
            {
              selection.end.row = selection.mark.row;
              selection.end.col = selection.mark.col + 1;
              selection.beg.row = pos.row;
              selection.beg.col = pos.col;
            }
          else
            {
              selection.beg.row = selection.mark.row;
              selection.beg.col = selection.mark.col;
              selection.end.row = pos.row;
              selection.end.col = pos.col + 1;
            }
        }
      else if (selection.clicks == 2)
        {
          selection_delimit_word (UP, &(selection.mark),
                                  &(selection.beg));
          selection_delimit_word (DN, &(selection.mark),
                                  &(selection.end));
          hate_those_clicks = 1;
        }
      else if (selection.clicks == 3)
        {
          selection.beg.row = selection.end.row = selection.mark.row;
          selection.beg.col = 0;
          selection.end.col = ncol;
          hate_those_clicks = 1;
        }
      D_SELECT((stderr, "rxvt_selection_extend_colrow() EXIT b:(r:%d,c:%d) m:(r:%d,c:%d), e:(r:%d,c:%d)", selection.beg.row, selection.beg.col, selection.mark.row, selection.mark.col, selection.end.row, selection.end.col));
      return;
    }
#endif                          /* ! NO_OLD_SELECTION */
#ifndef NO_NEW_SELECTION
  /* selection_style must not be OLD_SELECT to get here */
  /*
   * This is mainly xterm style selection with a couple of differences, mainly
   * in the way button3 drag extension works.
   * We're either doing: button1 drag; button3 press; or button3 drag
   *  a) button1 drag : select around a midpoint/word/line - that point/word/line
   *     is always at the left/right edge of the selection.
   *  b) button3 press: extend/contract character/word/line at whichever edge of
   *     the selection we are closest to.
   *  c) button3 drag : extend/contract character/word/line - we select around
   *     a point/word/line which is either the start or end of the selection
   *     and it was decided by whichever point/word/line was `fixed' at the
   *     time of the most recent button3 press
   */
  if (button3 && buttonpress)
    {       /* button3 press */
      /*
       * first determine which edge of the selection we are closest to
       */
      if (ROWCOL_IS_BEFORE(pos, selection.beg)
          || (!ROWCOL_IS_AFTER(pos, selection.end)
              && (((pos.col - selection.beg.col)
                   + ((pos.row - selection.beg.row) * ncol))
                  < ((selection.end.col - pos.col)
                     + ((selection.end.row - pos.row) * ncol)))))
        closeto = LEFT;
      if (closeto == LEFT)
        {
          selection.beg.row = pos.row;
          selection.beg.col = pos.col;
          selection.mark.row = selection.end.row;
          selection.mark.col = selection.end.col
                               - (selection.clicks == 2);
        }
      else
        {
          selection.end.row = pos.row;
          selection.end.col = pos.col;
          selection.mark.row = selection.beg.row;
          selection.mark.col = selection.beg.col;
        }
    }
  else
    {                    /* button1 drag or button3 drag */
      if (ROWCOL_IS_AFTER(selection.mark, pos))
        {
          if ((selection.mark.row == selection.end.row)
              && (selection.mark.col == selection.end.col)
              && clickchange && selection.clicks == 2)
            selection.mark.col--;
          selection.beg.row = pos.row;
          selection.beg.col = pos.col;
          selection.end.row = selection.mark.row;
          selection.end.col = selection.mark.col
                              + (selection.clicks == 2);
        }
      else
        {
          selection.beg.row = selection.mark.row;
          selection.beg.col = selection.mark.col;
          selection.end.row = pos.row;
          selection.end.col = pos.col;
        }
    }

  if (selection.clicks == 1)
    {
      end_col = screen.tlen[selection.beg.row + TermWin.saveLines];
      if (end_col != -1 && selection.beg.col > end_col)
        {
#if 1
          selection.beg.col = ncol;
#else
          if (selection.beg.row != selection.end.row)
            selection.beg.col = ncol;
          else
            selection.beg.col = selection.mark.col;
#endif

        }
      end_col = screen.tlen[selection.end.row + TermWin.saveLines];
      if (end_col != -1 && selection.end.col > end_col)
        selection.end.col = ncol;

    }
  else if (selection.clicks == 2)
    {
      if (ROWCOL_IS_AFTER(selection.end, selection.beg))
        selection.end.col--;
      selection_delimit_word (UP, &(selection.beg),
                              &(selection.beg));
      selection_delimit_word (DN, &(selection.end),
                              &(selection.end));
    }
  else if (selection.clicks == 3)
    {
#ifndef NO_FRILLS
      if ((Options & Opt_tripleclickwords))
        {
          int             end_row;

          selection_delimit_word (UP, &(selection.beg),
                                  &(selection.beg));
          end_row = screen.tlen[selection.mark.row
                                + TermWin.saveLines];
          for (end_row = selection.mark.row; end_row < TermWin.nrow;
               end_row++)
            {
              end_col = screen.tlen[end_row + TermWin.saveLines];
              if (end_col != -1)
                {
                  selection.end.row = end_row;
                  selection.end.col = end_col;
                  selection_remove_trailing_spaces ();
                  break;
                }
            }
        }
      else
#endif

        {
          if (ROWCOL_IS_AFTER(selection.mark, selection.beg))
            selection.mark.col++;
          selection.beg.col = 0;
          selection.end.col = ncol;
        }
    }
  if (button3 && buttonpress)
    {       /* mark may need to be changed */
      if (closeto == LEFT)
        {
          selection.mark.row = selection.end.row;
          selection.mark.col = selection.end.col
                               - (selection.clicks == 2);
        }
      else
        {
          selection.mark.row = selection.beg.row;
          selection.mark.col = selection.beg.col;
        }
    }
  D_SELECT((stderr, "rxvt_selection_extend_colrow() EXIT b:(r:%d,c:%d) m:(r:%d,c:%d), e:(r:%d,c:%d)", selection.beg.row, selection.beg.col, selection.mark.row, selection.mark.col, selection.end.row, selection.end.col));
#endif                          /* ! NO_NEW_SELECTION */
}

#ifndef NO_FRILLS
void
rxvt_term::selection_remove_trailing_spaces ()
{
  int32_t         end_col, end_row;
  text_t         *stp;

  end_col = selection.end.col;
  end_row = selection.end.row;
  for ( ; end_row >= selection.beg.row; )
    {
      stp = screen.text[end_row + TermWin.saveLines];
      while (--end_col >= 0)
        {
          if (stp[end_col] != ' ' && stp[end_col] != '\t')
            break;
        }
      if (end_col >= 0
          || screen.tlen[end_row - 1 + TermWin.saveLines] != -1)
        {
          selection.end.col = end_col + 1;
          selection.end.row = end_row;
          break;
        }
      end_row--;
      end_col = TermWin.ncol;
    }
  if (selection.mark.row > selection.end.row)
    {
      selection.mark.row = selection.end.row;
      selection.mark.col = selection.end.col;
    }
  else if (selection.mark.row == selection.end.row
           && selection.mark.col > selection.end.col)
    selection.mark.col = selection.end.col;
}
#endif

/* ------------------------------------------------------------------------- */
/*
 * Double click on button 3 when already selected
 * EXT: button 3 double click
 */
void
rxvt_term::selection_rotate (int x, int y)
{
  selection.clicks = selection.clicks % 3 + 1;
  selection_extend_colrow (Pixel2Col(x), Pixel2Row(y), 1, 0, 1);
}

/* ------------------------------------------------------------------------- */
/*
 * On some systems, the Atom typedef is 64 bits wide.  We need to have a type
 * that is exactly 32 bits wide, because a format of 64 is not allowed by
 * the X11 protocol.
 */
typedef CARD32 Atom32;

/* ------------------------------------------------------------------------- */
/*
 * Respond to a request for our current selection
 * EXT: SelectionRequest
 */
void
rxvt_term::selection_send (const XSelectionRequestEvent *rq)
{
  XSelectionEvent ev;
  XTextProperty ct;
  XICCEncodingStyle style;
  Atom target;

  ev.type = SelectionNotify;
  ev.property = None;
  ev.display = rq->display;
  ev.requestor = rq->requestor;
  ev.selection = rq->selection;
  ev.target = rq->target;
  ev.time = rq->time;

  if (rq->target == xa[XA_TARGETS])
    {
      Atom32 target_list[5];
      Atom32 *target = target_list;

      *target++ = (Atom32) xa[XA_TARGETS];
      *target++ = (Atom32) XA_STRING;
      *target++ = (Atom32) xa[XA_TEXT];
      *target++ = (Atom32) xa[XA_COMPOUND_TEXT];
#if X_HAVE_UTF8_STRING
      *target++ = (Atom32) xa[XA_UTF8_STRING];
#endif
      XChangeProperty(Xdisplay, rq->requestor, rq->property, XA_ATOM,
                      (8 * sizeof(target_list[0])), PropModeReplace,
                      (unsigned char *)target_list,
                      target - target_list);
      ev.property = rq->property;
    }
  else if (rq->target == xa[XA_MULTIPLE])
    {
      /* TODO: Handle MULTIPLE */
    }
  else if (rq->target == xa[XA_TIMESTAMP] && selection.text)
    {
      XChangeProperty(Xdisplay, rq->requestor, rq->property, XA_INTEGER,
                      (8 * sizeof(Time)), PropModeReplace,
                      (unsigned char *)&selection_time, 1);
      ev.property = rq->property;
    }
  else if (rq->target == XA_STRING
           || rq->target == xa[XA_TEXT]
           || rq->target == xa[XA_COMPOUND_TEXT]
           || rq->target == xa[XA_UTF8_STRING]
          )
    {
      short freect = 0;
      int selectlen;
      char *cl;

      target = rq->target;

      if (target == XA_STRING)
        // we actually don't do XA_STRING, but who cares, as i18n clients
        // will ask for another format anyways.
        style = XStringStyle;
      else if (target == xa[XA_TEXT])
        style = XTextStyle;
      else if (target == xa[XA_COMPOUND_TEXT])
        style = XCompoundTextStyle;
#if X_HAVE_UTF8_STRING
      else if (target == xa[XA_UTF8_STRING])
        style = XUTF8StringStyle;
#endif
      else
        {
          target = xa[XA_COMPOUND_TEXT];
          style = XCompoundTextStyle;
        }

      if (selection.text)
        {
          cl = (char *)selection.text;
          selectlen = selection.len;
        }
      else
        {
          cl = "";
          selectlen = 0;
        }

      if (XmbTextListToTextProperty(Xdisplay, &cl, 1, style, &ct) >= 0)
        freect = 1;
      else
        {
          /* if we failed to convert then send it raw */
          ct.value = (unsigned char *)cl;
          ct.nitems = selectlen;
        }

      XChangeProperty(Xdisplay, rq->requestor, rq->property,
                      target, 8, PropModeReplace,
                      ct.value, (int)ct.nitems);
      ev.property = rq->property;

      if (freect)
        XFree (ct.value);
    }
  XSendEvent(Xdisplay, rq->requestor, False, 0L, (XEvent *)&ev);
}

/* ------------------------------------------------------------------------- *
 *                              MOUSE ROUTINES                               *
 * ------------------------------------------------------------------------- */

/*
 * return col/row values corresponding to x/y pixel values
 */
void
rxvt_term::pixel_position (int *x, int *y)
{
  *x = Pixel2Col(*x);
  /* MAX_IT(*x, 0); MIN_IT(*x, (int)TermWin.ncol - 1); */
  *y = Pixel2Row(*y);
  /* MAX_IT(*y, 0); MIN_IT(*y, (int)TermWin.nrow - 1); */
}

/* ------------------------------------------------------------------------- */
#ifdef USE_XIM
void
rxvt_term::set_position (XPoint *pos)
{
  XWindowAttributes xwa;

  XGetWindowAttributes (Xdisplay, TermWin.vt, &xwa);
  pos->x = Col2Pixel (screen.cur.col) + xwa.x;
  pos->y = Height2Pixel ((screen.cur.row + 1)) + xwa.y - TermWin.lineSpace;
}

#endif
/* ------------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- *
 *                              DEBUG ROUTINES                               *
 * ------------------------------------------------------------------------- */
#if 0
void
rxvt_debug_colors(void)
{
  int             color;
  const char     *name[] =
    {
      "fg", "bg",
      "black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"
    };

  fprintf(stderr, "Color ( ");
  if (rstyle & RS_RVid)
    fprintf(stderr, "rvid ");
  if (rstyle & RS_Bold)
    fprintf(stderr, "bold ");
  if (rstyle & RS_Blink)
    fprintf(stderr, "blink ");
  if (rstyle & RS_Uline)
    fprintf(stderr, "uline ");
  fprintf(stderr, "): ");

  color = GET_FGCOLOR(rstyle);
#ifndef NO_BRIGHTCOLOR
  if (color >= minBrightCOLOR && color <= maxBrightCOLOR)
    {
      color -= (minBrightCOLOR - minCOLOR);
      fprintf(stderr, "bright ");
    }
#endif
  fprintf(stderr, "%s on ", name[color]);

  color = GET_BGCOLOR(rstyle);
#ifndef NO_BRIGHTCOLOR
  if (color >= minBrightCOLOR && color <= maxBrightCOLOR)
    {
      color -= (minBrightCOLOR - minCOLOR);
      fprintf(stderr, "bright ");
    }
#endif
  fprintf(stderr, "%s\n", name[color]);
}
#endif
Revision:	1.26
Committed:	Sun Feb 1 20:12:53 2004 UTC (20 years, 3 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+11 -11 lines
Log Message:	* empty log message *