rxvt-unicode/src/screen.C

/*---------------------------------------------------------------------------*
 * File:        screen.C
 *---------------------------------------------------------------------------*
 *
 * Copyright (c) 1997-2001 Geoff Wing <gcw@pobox.com>
 * Copyright (c) 2003-2007 Marc Lehmann <schmorp@schmorp.de>
 *
 * 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 3 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.
 *--------------------------------------------------------------------------*/

/*
 * This file handles _all_ screen updates and selections
 */

#include "../config.h"          /* NECESSARY */
#include "rxvt.h"               /* NECESSARY */
#include "rxvtperl.h"           /* NECESSARY */

#include <inttypes.h>

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

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

/* ------------------------------------------------------------------------- *
 *             GENERAL SCREEN AND SELECTION UPDATE ROUTINES                  *
 * ------------------------------------------------------------------------- */
#define ZERO_SCROLLBACK()                                              \
    if (option (Opt_scrollTtyOutput))                                  \
        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_CHARS: clear <num> chars starting from pixel position <x,y>
 */
#define CLEAR_CHARS(x, y, num)                                         \
    if (mapped)                                                        \
        XClearArea (dpy, vt, x, y,                                     \
                    (unsigned int)Width2Pixel (num),                   \
                    (unsigned int)Height2Pixel (1), False)

/* ------------------------------------------------------------------------- *
 *                        SCREEN `COMMON' ROUTINES                           *
 * ------------------------------------------------------------------------- */

/* Fill part/all of a line with blanks. */
void
rxvt_term::scr_blank_line (line_t &l, unsigned int col, unsigned int width, rend_t efs) const NOTHROW
{
  if (!l.valid ())
    {
      l.alloc ();
      col = 0;
      width = ncol;
    }

  l.touch ();

  efs &= ~RS_baseattrMask; // remove italic etc. fontstyles
  efs = SET_FONT (efs, FONTSET (efs)->find_font (' '));

  text_t *et = l.t + col;
  rend_t *er = l.r + col;

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

/* ------------------------------------------------------------------------- */
/* Fill a full line with blanks - make sure it is allocated first */
void
rxvt_term::scr_blank_screen_mem (line_t &l, rend_t efs) const NOTHROW
{
  scr_blank_line (l, 0, ncol, efs);

  l.l = 0;
  l.f = 0;
}

// nuke a single wide character at the given column
void
rxvt_term::scr_kill_char (line_t &l, int col) const NOTHROW
{
  // find begin
  while (col > 0 && l.t[col] == NOCHAR)
    col--;

  rend_t rend = l.r[col] & ~RS_baseattrMask;
  rend = SET_FONT (rend, FONTSET (rend)->find_font (' '));

  l.touch ();

  // found start, nuke
  do {
    l.t[col] = ' ';
    l.r[col] = rend;
    col++;
  } while (col < ncol && l.t[col] == NOCHAR);
}

// set the rendition of a single wide character beginning at the given column
void
rxvt_term::scr_set_char_rend (line_t &l, int col, rend_t rend)
{
  do {
    l.r[col] = rend;
    col++;
  } while (col < ncol && l.t[col] == NOCHAR);
}

/* ------------------------------------------------------------------------- *
 *                          SCREEN INITIALISATION                            *
 * ------------------------------------------------------------------------- */

void
rxvt_term::scr_alloc () NOTHROW
{
  int tsize = sizeof (text_t) * ncol;
  int rsize = sizeof (rend_t) * ncol;

  // we assume that rend_t size is a sufficient alignment
  // factor for text_t and line_t values, and we only
  // need to adjust tsize.
  tsize = (tsize + sizeof (rend_t) - 1);
  tsize -= tsize % sizeof (rend_t);

  int all_rows = total_rows + nrow + nrow;

  chunk_size = (sizeof (line_t) + rsize + tsize) * all_rows;
  chunk = chunk_alloc (chunk_size, 0);

  char *base = (char *)chunk + sizeof (line_t) * all_rows;

  for (int row = 0; row < all_rows; ++row)
    {
      line_t &l = ((line_t *)chunk) [row];

      l.t = (text_t *)base; base += tsize;
      l.r = (rend_t *)base; base += rsize;
      l.l = -1;
      l.f = 0;
    }

  drawn_buf = (line_t *)chunk;
  swap_buf  = drawn_buf + nrow;
  row_buf   = swap_buf  + nrow;
}

void
rxvt_term::copy_line (line_t &dst, line_t &src)
{
  scr_blank_screen_mem (dst, DEFAULT_RSTYLE);
  dst.l = min (src.l, ncol);
  memcpy (dst.t, src.t, sizeof (text_t) * dst.l);
  memcpy (dst.r, src.r, sizeof (rend_t) * dst.l);
  dst.f = src.f;
}

void ecb_cold
rxvt_term::scr_reset ()
{
#if ENABLE_OVERLAY
  scr_overlay_off ();
#endif

  view_start = 0;
  num_scr = 0;

  if (ncol == 0)
    ncol = 80;

  if (nrow == 0)
    nrow = 24;

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

  // we need at least two lines for wrapping to work correctly
  while (nrow + saveLines < 2)
    {
      //TODO//FIXME
      saveLines++;
      prev_nrow--;
      top_row--;
    }

  want_refresh = 1;

  int prev_total_rows = prev_nrow + saveLines;
  total_rows = nrow + saveLines;

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

  void *prev_chunk = chunk;
  size_t prev_chunk_size = chunk_size;
  line_t *prev_drawn_buf = drawn_buf;
  line_t *prev_swap_buf  = swap_buf;
  line_t *prev_row_buf   = row_buf;

  scr_alloc ();

  if (!prev_row_buf)
    {
      top_row    = 0;
      term_start = 0;

      memset (charsets, 'B', sizeof (charsets));
      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;
      selection.clip_text = NULL;
      selection.clip_len = 0;
    }
  else
    {
      /*
       * add or delete rows as appropriate
       */

      int common_col = min (prev_ncol, ncol);

      for (int row = min (nrow, prev_nrow); row--; )
        {
          scr_blank_screen_mem (drawn_buf [row], DEFAULT_RSTYLE);
          memcpy (drawn_buf [row].t, prev_drawn_buf [row].t, sizeof (text_t) * common_col);
          memcpy (drawn_buf [row].r, prev_drawn_buf [row].r, sizeof (rend_t) * common_col);

          copy_line (swap_buf [row], prev_swap_buf [row]);
        }

      int p    = MOD (term_start + prev_nrow, prev_total_rows);  // previous row
      int pend = MOD (term_start + top_row  , prev_total_rows);
      int q    = total_rows; // rewrapped row

      if (top_row)
        {
          // Re-wrap lines. This is rather ugly, possibly because I am too dumb
          // to come up with a lean and mean algorithm.
          // TODO: maybe optimise when width didn't change

          row_col_t ocur = screen.cur;
          ocur.row = MOD (term_start + ocur.row, prev_total_rows);

          do
            {
              p = MOD (p - 1, prev_total_rows);
              assert (prev_row_buf [MOD (p, prev_total_rows)].t);
              int plines = 1;
              int llen = prev_row_buf [MOD (p, prev_total_rows)].l;

              while (p != pend && prev_row_buf [MOD (p - 1, prev_total_rows)].is_longer ())
                {
                  p = MOD (p - 1, prev_total_rows);

                  plines++;
                  llen += prev_ncol;
                }

              int qlines = max (0, (llen - 1) / ncol) + 1;

              // drop partial lines completely
              if (q < qlines)
                break;

              q -= qlines;

              int lofs = 0;
              line_t *qline;

              // re-assemble the full line by destination lines
              for (int qrow = q; qlines--; qrow++)
                {
                  qline = row_buf + qrow;
                  qline->alloc (); // redundant with next line
                  qline->l = ncol;
                  qline->is_longer (1);

                  int qcol = 0;

                  // see below for cursor adjustment rationale
                  if (p == ocur.row)
                    screen.cur.row = q - (total_rows - nrow);

                  // fill a single destination line
                  while (lofs < llen && qcol < ncol)
                    {
                      int prow = lofs / prev_ncol;
                      int pcol = lofs % prev_ncol;

                      prow = MOD (p + prow, prev_total_rows);

                      // we only adjust the cursor _row_ and put it into
                      // the topmost line of "long line" it was in, as
                      // this seems to upset applications/shells/readline
                      // least.
                      if (prow == ocur.row)
                        screen.cur.row = q - (total_rows - nrow);

                      line_t &pline = prev_row_buf [prow];

                      int len = min (min (prev_ncol - pcol, ncol - qcol), llen - lofs);

                      memcpy (qline->t + qcol, pline.t + pcol, len * sizeof (text_t));
                      memcpy (qline->r + qcol, pline.r + pcol, len * sizeof (rend_t));

                      lofs += len;
                      qcol += len;
                    }
                }

              qline->l = llen ? MOD (llen - 1, ncol) + 1 : 0;
              qline->is_longer (0);
              scr_blank_line (*qline, qline->l, ncol - qline->l, DEFAULT_RSTYLE);
            }
          while (p != pend && q > 0);

          term_start = total_rows - nrow;
          top_row = q - term_start;

          // make sure all terminal lines exist
          while (top_row > 0)
            scr_blank_screen_mem (ROW (--top_row), DEFAULT_RSTYLE);
        }
      else
        {
          // if no scrollback exists (yet), wing, instead of wrap

          for (int row = min (nrow, prev_nrow); row--; )
            {
              line_t &src = prev_row_buf [MOD (term_start + row, prev_total_rows)];
              line_t &dst = row_buf [row];

              copy_line (dst, src);
            }

          for (int row = prev_nrow; row < nrow; row++)
            scr_blank_screen_mem (row_buf [row], DEFAULT_RSTYLE);

          term_start = 0;
        }

      clamp_it (screen.cur.row, 0, nrow - 1);
      clamp_it (screen.cur.col, 0, ncol - 1);
    }

  for (int row = nrow; row--; )
    {
      if (!ROW       (row).valid ()) scr_blank_screen_mem (ROW       (row), DEFAULT_RSTYLE);
      if (!swap_buf  [row].valid ()) scr_blank_screen_mem (swap_buf  [row], DEFAULT_RSTYLE);
      if (!drawn_buf [row].valid ()) scr_blank_screen_mem (drawn_buf [row], DEFAULT_RSTYLE);
    }

  chunk_free (prev_chunk, prev_chunk_size);

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

  for (int col = ncol; col--; )
    tabs [col] = col % TABSIZE == 0;

  CLEAR_ALL_SELECTION ();

  prev_nrow = nrow;
  prev_ncol = ncol;

  tt_winch ();

  HOOK_INVOKE ((this, HOOK_RESET, DT_END));
}

void ecb_cold
rxvt_term::scr_release () NOTHROW
{
  chunk_free (chunk, chunk_size);
  chunk = 0;
  row_buf = 0;

  free (tabs);
  tabs = 0;
}

/* ------------------------------------------------------------------------- */
/*
 * Hard/Soft reset
 */
void ecb_cold
rxvt_term::scr_poweron ()
{
  scr_release ();

  prev_nrow = prev_ncol = 0;
  rvideo_mode = false;
  scr_soft_reset ();
  scr_reset ();

  scr_clear (true);
  scr_refresh ();
}

void ecb_cold
rxvt_term::scr_soft_reset () NOTHROW
{
  /* only affects modes, nothing drastic such as clearing the screen */
#if ENABLE_OVERLAY
  scr_overlay_off ();
#endif

  if (current_screen != PRIMARY)
    scr_swap_screen ();

  scr_scroll_region (0, MAX_ROWS - 1);
  scr_rendition (0, ~RS_None);
  scr_insert_mode (0);
}

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

#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 = screen.cur.row;
        s->s_cur.col = screen.cur.col;
        s->s_rstyle = rstyle;
        s->s_charset = screen.charset;
        s->s_charset_char = charsets[screen.charset];
        break;

      case RESTORE:
        want_refresh = 1;
        screen.cur.row = s->s_cur.row;
        screen.cur.col = s->s_cur.col;
        screen.flags &= ~Screen_WrapNext;
        rstyle = s->s_rstyle;
        screen.charset = s->s_charset;
        charsets[screen.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, nrow - 1);
  min_it (s->cur.col, ncol - 1);
  assert (s->cur.row >= 0);
  assert (s->cur.col >= 0);
}

void
rxvt_term::scr_swap_screen () NOTHROW
{
  if (!option (Opt_secondaryScreen))
    return;

  for (int i = prev_nrow; i--; )
    ::swap (ROW(i), swap_buf [i]);

  ::swap (screen.cur, swap.cur);

  screen.cur.row = clamp (screen.cur.row, 0, prev_nrow - 1);
  screen.cur.col = clamp (screen.cur.col, 0, prev_ncol - 1);
}

/* ------------------------------------------------------------------------- */
/*
 * Swap between primary and secondary screens
 * XTERM_SEQ: Primary screen  : ESC [ ? 4 7 h
 * XTERM_SEQ: Secondary screen: ESC [ ? 4 7 l
 */
void
rxvt_term::scr_change_screen (int scrn)
{
  if (scrn == current_screen)
    return;

  want_refresh = 1;
  view_start = 0;

  /* check for boundary cross */
  row_col_t pos;
  pos.row = pos.col = 0;
  if (ROWCOL_IS_BEFORE (selection.beg, pos)
      && ROWCOL_IS_AFTER (selection.end, pos))
    CLEAR_SELECTION ();

  current_screen = scrn;

#if NSCREENS
  if (option (Opt_secondaryScreen))
    {
      num_scr = 0;

      scr_swap_screen ();

      ::swap (screen.charset, swap.charset);
      ::swap (screen.flags,   swap.flags);
      screen.flags |= Screen_VisibleCursor;
      swap.flags   |= Screen_VisibleCursor;
    }
  else
#endif
    if (option (Opt_secondaryScroll))
      scr_scroll_text (0, prev_nrow - 1, prev_nrow);
}

// clear WrapNext indicator, solidifying position on next line
void
rxvt_term::scr_do_wrap () NOTHROW
{
  if (!(screen.flags & Screen_WrapNext))
    return;

  screen.flags &= ~Screen_WrapNext;

  screen.cur.col = 0;

  if (screen.cur.row == screen.bscroll)
    scr_scroll_text (screen.tscroll, screen.bscroll, 1);
  else if (screen.cur.row < nrow - 1)
    screen.cur.row++;
}

/* ------------------------------------------------------------------------- */
/*
 * Change the colour for following text
 */
void
rxvt_term::scr_color (unsigned int color, int fgbg) NOTHROW
{
  if (!IN_RANGE_INC (color, minCOLOR, maxTermCOLOR))
    color = fgbg;

  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) NOTHROW
{
  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
 */
int ecb_hot
rxvt_term::scr_scroll_text (int row1, int row2, int count) NOTHROW
{
  if (count == 0 || (row1 > row2))
    return 0;

  want_refresh = 1;
  num_scr += count;

  if (count > 0
      && row1 == 0
      && (current_screen == PRIMARY || option (Opt_secondaryScroll)))
    {
      min_it (count, total_rows - (nrow - (row2 + 1)));

      top_row = max (top_row - count, -saveLines);

      // sever bottommost line
      {
        line_t &l = ROW(row2);
        l.is_longer (0);
        l.touch ();
      }

      // scroll everything up 'count' lines
      term_start = (term_start + count) % total_rows;

      // now copy lines below the scroll region bottom to the
      // bottom of the screen again, so they look as if they
      // hadn't moved.
      for (int i = nrow; --i > row2; )
        {
          line_t &l1 = ROW(i - count);
          line_t &l2 = ROW(i);

          ::swap (l1, l2);
          l2.touch ();
        }

      // erase newly scrolled-in lines
      for (int i = count; i--; )
        {
          line_t &l = ROW(row2 - i);

          // optimise if already cleared, can be significant on slow machines
          // could be rolled into scr_blank_screen_mem
          if (l.r && l.l < ncol - 1 && !((l.r[l.l + 1] ^ rstyle) & (RS_fgMask | RS_bgMask)))
            {
              scr_blank_line (l, 0, l.l, rstyle);
              l.l = 0;
              l.f = 0;
            }
          else
            scr_blank_screen_mem (l, rstyle);
        }

      // move and/or clear selection, if any
      if (selection.op && current_screen == selection.screen
          && selection.beg.row <= row2)
        {
          selection.beg.row  -= count;
          selection.end.row  -= count;
          selection.mark.row -= count;

          selection_check (0);
        }

      // finally move the view window, if desired
      if (option (Opt_scrollWithBuffer)
          && view_start != 0
          && view_start != -saveLines)
        scr_page (count);

      if (SHOULD_INVOKE (HOOK_SCROLL_BACK))
        HOOK_INVOKE ((this, HOOK_SCROLL_BACK, DT_INT, count, DT_INT, top_row, DT_END));
    }
  else
    {
      if (selection.op && current_screen == selection.screen)
        {
          if ((selection.beg.row < row1 && selection.end.row > row1)
              || (selection.beg.row < row2 && selection.end.row > row2)
              || (selection.beg.row - count < row1 && selection.beg.row >= row1)
              || (selection.beg.row - count > row2 && selection.beg.row <= row2)
              || (selection.end.row - count < row1 && selection.end.row >= row1)
              || (selection.end.row - count > row2 && selection.end.row <= row2))
            {
              CLEAR_ALL_SELECTION ();
              selection.op = SELECTION_CLEAR;
            }
          else if (selection.end.row >= row1 && selection.end.row <= row2)
            {
              /* move selected region too */
              selection.beg.row  -= count;
              selection.end.row  -= count;
              selection.mark.row -= count;

              selection_check (0);
            }
        }

      // use a simple and robust scrolling algorithm, this
      // part of scr_scroll_text is not time-critical.

      // sever line above scroll region
      if (row1)
        {
          line_t &l = ROW(row1 - 1);
          l.is_longer (0);
          l.touch ();
        }

      int rows = row2 - row1 + 1;

      min_it (count, rows);

      line_t *temp_buf = rxvt_temp_buf<line_t> (rows);

      for (int row = 0; row < rows; row++)
        {
          temp_buf [row] = ROW(row1 + (row + count + rows) % rows);

          if (!IN_RANGE_EXC (row + count, 0, rows))
            scr_blank_screen_mem (temp_buf [row], rstyle);
        }

      for (int row = 0; row < rows; row++)
        ROW(row1 + row) = temp_buf [row];

      // sever bottommost line
      {
        line_t &l = ROW(row2);
        l.is_longer (0);
        l.touch ();
      }
    }

  return count;
}

/* ------------------------------------------------------------------------- */
/*
 * Add text given in <str> of length <len> to screen struct
 */
void ecb_hot
rxvt_term::scr_add_lines (const wchar_t *str, int len, int minlines) NOTHROW
{
  if (len <= 0)               /* sanity */
    return;

  bool checksel;
  unicode_t c;
  int ncol = this->ncol;
  const wchar_t *strend = str + len;

  want_refresh = 1;
  ZERO_SCROLLBACK ();

  if (minlines > 0)
    {
      minlines += screen.cur.row - screen.bscroll;
      min_it (minlines, screen.cur.row - top_row);

      if (minlines > 0
          && screen.tscroll == 0
          && screen.bscroll == nrow - 1)
        {
          /* _at least_ this many lines need to be scrolled */
          scr_scroll_text (screen.tscroll, screen.bscroll, minlines);
          screen.cur.row -= minlines;
        }
    }

  assert (screen.cur.col < ncol);
  assert (screen.cur.row < nrow
          && screen.cur.row >= top_row);
  int row = screen.cur.row;

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

  line_t *line = &ROW(row);

  while (str < strend)
    {
      c = (unicode_t)*str++; // convert to rxvt-unicodes representation

      if (ecb_unlikely (c < 0x20))
        if (c == C0_LF)
          {
            max_it (line->l, screen.cur.col);

            screen.flags &= ~Screen_WrapNext;

            if (screen.cur.row == screen.bscroll)
              scr_scroll_text (screen.tscroll, screen.bscroll, 1);
            else if (screen.cur.row < (nrow - 1))
              row = ++screen.cur.row;

            line = &ROW(row);  /* _must_ refresh */
            continue;
          }
        else if (c == C0_CR)
          {
            max_it (line->l, screen.cur.col);

            screen.flags &= ~Screen_WrapNext;
            screen.cur.col = 0;
            continue;
          }
        else if (c == C0_HT)
          {
            scr_tab (1, true);
            continue;
          }

      if (ecb_unlikely (
            checksel            /* see if we're writing within selection */
            && !ROWCOL_IS_BEFORE (screen.cur, selection.beg)
            && ROWCOL_IS_BEFORE (screen.cur, selection.end)
         ))
        {
          checksel = 0;
          /*
           * 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.
           */
          CLEAR_SELECTION ();
        }

      if (ecb_unlikely (screen.flags & Screen_WrapNext))
        {
          scr_do_wrap ();

          line->l = ncol;
          line->is_longer (1);

          row = screen.cur.row;
          line = &ROW(row);   /* _must_ refresh */
        }

      // some utf-8 decoders "decode" surrogate characters: let's fix this.
      if (ecb_unlikely (IN_RANGE_INC (c, 0xd800, 0xdfff)))
        c = 0xfffd;

      // rely on wcwidth to tell us the character width, do wcwidth before
      // further replacements, as wcwidth might return -1 for the line
      // drawing characters below as they might be invalid in the current
      // locale.
      int width = WCWIDTH (c);

      if (ecb_unlikely (charsets [screen.charset] == '0')) // DEC SPECIAL
        {
          // vt100 special graphics and line drawing
          // 5f-7e standard vt100
          // 40-5e rxvt extension for extra curses acs chars
          static uint16_t vt100_0[62] = { // 41 .. 7e
                    0x2191, 0x2193, 0x2192, 0x2190, 0x2588, 0x259a, 0x2603, // 41-47 hi mr. snowman!
                 0,      0,      0,      0,      0,      0,      0,      0, // 48-4f
                 0,      0,      0,      0,      0,      0,      0,      0, // 50-57
                 0,      0,      0,      0,      0,      0,      0, 0x0020, // 58-5f
            0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1, // 60-67
            0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba, // 68-6f
            0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c, // 70-77
            0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7,         // 78-7e
          };

          if (c >= 0x41 && c <= 0x7e && vt100_0[c - 0x41])
            {
              c = vt100_0[c - 0x41];
              width = 1; // vt100 line drawing characters are always single-width
            }
        }

      if (ecb_unlikely (screen.flags & Screen_Insert))
        scr_insdel_chars (width, INSERT);

      if (width != 0)
        {
#if !UNICODE_3
          // trim characters we can't store directly :(
          if (c >= 0x10000)
# if ENABLE_COMBINING
            c = rxvt_composite.compose (c); // map to lower 16 bits
# else
            c = 0xfffd;
# endif
#endif

          rend_t rend = SET_FONT (rstyle, FONTSET (rstyle)->find_font (c));

          // if the character doesn't fit into the remaining columns...
          if (ecb_unlikely (screen.cur.col > ncol - width && ncol >= width))
            {
              if (screen.flags & Screen_Autowrap)
                {
                  // ... artificially enlargen the previous one
                  c = NOCHAR;
                  // and try the same character next loop iteration
                  --str;
                }
              else
                screen.cur.col = ncol - width;
            }

          // nuke the character at this position, if required
          // due to wonderful coincidences everywhere else in this loop
          // we never have to check for overwriting a wide char itself,
          // only its tail.
          if (ecb_unlikely (line->t[screen.cur.col] == NOCHAR))
            scr_kill_char (*line, screen.cur.col);

          line->touch ();

          do
            {
              line->t[screen.cur.col] = c;
              line->r[screen.cur.col] = rend;

              if (ecb_likely (screen.cur.col < ncol - 1))
                screen.cur.col++;
              else
                {
                  line->l = ncol;
                  if (screen.flags & Screen_Autowrap)
                    screen.flags |= Screen_WrapNext;

                  goto end_of_line;
                }

              c = NOCHAR;
            }
          while (ecb_unlikely (--width > 0));

          // pad with spaces when overwriting wide character with smaller one
          for (int c = screen.cur.col; ecb_unlikely (c < ncol && line->t[c] == NOCHAR); c++)
            {
              line->t[c] = ' ';
              line->r[c] = rend;
            }

end_of_line:
          ;
        }
#if ENABLE_COMBINING
      else // width == 0
        {
          if (c != 0xfeff) // ignore BOM
            {
              // handle combining characters
              // we just tag the accent on the previous on-screen character.
              // this is arguably not correct, but also arguably not wrong.
              // we don't handle double-width characters nicely yet.
              line_t *linep;
              text_t *tp;
              rend_t *rp;

              if (screen.cur.col > 0)
                {
                  linep = line;
                  tp = line->t + screen.cur.col - 1;
                  rp = line->r + screen.cur.col - 1;
                }
              else if (screen.cur.row > 0
                       && ROW(screen.cur.row - 1).is_longer ())
                {
                  linep = &ROW(screen.cur.row - 1);
                  tp = linep->t + ncol - 1;
                  rp = linep->r + ncol - 1;
                }
              else
                continue;

              linep->touch ();

              while (*tp == NOCHAR && tp > linep->t)
                tp--, rp--;

              // first try to find a precomposed character
              unicode_t n = rxvt_compose (*tp, c);
              if (n == NOCHAR)
                n = rxvt_composite.compose (*tp, c);

              *tp = n;
              *rp = SET_FONT (*rp, FONTSET (*rp)->find_font (*tp));
            }
        }
#endif
    }

  max_it (line->l, screen.cur.col);

  assert (screen.cur.row >= 0);
}

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

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

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

  want_refresh = 1;
  i = x = screen.cur.col;

  if (count == 0)
    return;
  else if (count > 0)
    {
      line_t &l = ROW(screen.cur.row);
      rend_t base_rend = l.r[i];
      ht &= l.t[i] == ' ';

      for (; ++i < ncol; )
        if (tabs[i])
          {
            x = i;

            if (!--count)
              break;
          }
        else
          ht &= l.t[i] == ' '
                && RS_SAME (l.r[i], base_rend);

      if (count)
        x = ncol - 1;

      // store horizontal tab commands as characters inside the text
      // buffer so they can be selected and pasted.
      if (ht && option (Opt_pastableTabs))
        {
          base_rend = SET_FONT (base_rend, 0);

          l.touch (x);

          i = screen.cur.col;

          l.t[i] = '\t';
          l.r[i] = base_rend;

          while (++i < x)
            {
              l.t[i] = NOCHAR;
              l.r[i] = base_rend;
            }
        }
    }
  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.
 */
#if !ENABLE_MINIMAL
void ecb_cold
rxvt_term::scr_backindex () NOTHROW
{
  if (screen.cur.col > 0)
    scr_gotorc (0, -1, R_RELATIVE | C_RELATIVE);
  else
    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.
 */
#if !ENABLE_MINIMAL
void ecb_cold
rxvt_term::scr_forwardindex () NOTHROW
{
  if (screen.cur.col < ncol - 1)
    scr_gotorc (0, 1, R_RELATIVE | C_RELATIVE);
  else
    {
      line_t &l = ROW(screen.cur.row);

      l.touch ();
      l.is_longer (0);

      scr_gotorc (0, 0, R_RELATIVE);
      scr_insdel_chars (1, DELETE);
      scr_gotorc (0, ncol - 1, R_RELATIVE);
    }
}
#endif

/* ------------------------------------------------------------------------- */
/*
 * Goto Row/Column
 */
void
rxvt_term::scr_gotorc (int row, int col, int relative) NOTHROW
{
  want_refresh = 1;
  ZERO_SCROLLBACK ();

  screen.cur.col = relative & C_RELATIVE ? screen.cur.col + col : col;
  clamp_it (screen.cur.col, 0, 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;
    }

  clamp_it (screen.cur.row, 0, nrow - 1);
}

/* ------------------------------------------------------------------------- */
/*
 * direction should be UP or DN
 */
void
rxvt_term::scr_index (enum page_dirn direction) NOTHROW
{
  want_refresh = 1;
  ZERO_SCROLLBACK ();

  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, direction);
  else
    screen.cur.row += direction;

  clamp_it (screen.cur.row, 0, 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
 * extension: clear to right unless wrapped: ESC [ 3 K
 */
void
rxvt_term::scr_erase_line (int mode) NOTHROW
{
  unsigned int col, num;

  want_refresh = 1;
  ZERO_SCROLLBACK ();

  selection_check (1);

  line_t &line = ROW(screen.cur.row);

  line.touch ();
  line.is_longer (0);

  switch (mode)
    {
      case 3:
        if (screen.flags & Screen_WrapNext)
          return;

        /* fall through */

      case 0:                     /* erase to end of line */
        col = screen.cur.col;
        num = ncol - col;
        min_it (line.l, 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 = ncol;
        line.l = 0;
        if (selection.beg.row <= screen.cur.row
            && selection.end.row >= screen.cur.row)
          CLEAR_SELECTION ();
        break;
      default:
        return;
    }

  scr_blank_line (line, col, num, rstyle);
}

/* ------------------------------------------------------------------------- */
/*
 * Erase part or 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) NOTHROW
{
  int num;
  int32_t row;
  rend_t ren;
  XGCValues gcvalue;

  want_refresh = 1;
  ZERO_SCROLLBACK ();

  switch (mode)
    {
      case 0:                     /* erase to end of screen */
        scr_erase_line (0);
        row = screen.cur.row + 1;    /* possible OOB */
        num = nrow - row;
        break;
      case 1:                     /* erase to beginning of screen */
        scr_erase_line (1);
        row = 0;
        num = screen.cur.row;
        break;
      case 2:                     /* erase whole screen */
        row = 0;
        num = nrow;
        break;
      default:
        return;
    }

  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 >= nrow) /* Out Of Bounds */
    return;

  min_it (num, nrow - row);

  if (rstyle & (RS_Blink | RS_RVid | RS_Uline))
    ren = (rend_t) ~RS_None;
  else if (GET_BASEBG (rstyle) == Color_bg)
    {
      ren = DEFAULT_RSTYLE;

      if (mapped)
        XClearArea (dpy, vt, 0,
                    Row2Pixel (row - view_start), (unsigned int)vt_width,
                    (unsigned int)Height2Pixel (num), False);
    }
  else
    {
      ren = rstyle & (RS_fgMask | RS_bgMask);

      if (mapped)
        {
          gcvalue.foreground = pix_colors[bgcolor_of (rstyle)];
          XChangeGC (dpy, gc, GCForeground, &gcvalue);
          XFillRectangle (dpy, vt, gc,
                          0, Row2Pixel (row - view_start),
                          (unsigned int)vt_width,
                          (unsigned int)Height2Pixel (num));
          gcvalue.foreground = pix_colors[Color_fg];
          XChangeGC (dpy, gc, GCForeground, &gcvalue);
        }
    }

  for (; num--; row++)
    {
      scr_blank_screen_mem (ROW(row), rstyle);

      if (row - view_start < nrow)
        scr_blank_line (drawn_buf [row - view_start], 0, ncol, ren);
    }
}

#if !ENABLE_MINIMAL
void
rxvt_term::scr_erase_savelines () NOTHROW
{
  want_refresh = 1;
  ZERO_SCROLLBACK ();

  top_row = 0;
}
#endif

/* ------------------------------------------------------------------------- */
/*
 * Fill the screen with `E's
 * XTERM_SEQ: Screen Alignment Test: ESC # 8
 */
void ecb_cold
rxvt_term::scr_E () NOTHROW
{
  rend_t fs;

  want_refresh = 1;
  ZERO_SCROLLBACK ();

  num_scr_allow = 0;

  row_col_t pos;
  pos.row = pos.col = 0;
  if (ROWCOL_IS_AFTER (selection.end, pos))
    CLEAR_SELECTION ();

  fs = SET_FONT (rstyle, FONTSET (rstyle)->find_font ('E'));
  for (int row = nrow; row--; )
    {
      line_t &line = ROW(row);

      fill_text (line.t, 'E', ncol);
      rend_t *r1 = line.r;

      for (int j = ncol; j--; )
        *r1++ = fs;

      line.is_longer (0);
      line.touch (ncol);
    }
}

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

  ZERO_SCROLLBACK ();

  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;
    }

  scr_do_wrap ();

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

/* ------------------------------------------------------------------------- */
/*
 * Insert/Delete <count> characters from the current position
 */
void
rxvt_term::scr_insdel_chars (int count, int insdel) NOTHROW
{
  want_refresh = 1;
  ZERO_SCROLLBACK ();

  if (count <= 0)
    return;

  scr_do_wrap ();

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

  int row = screen.cur.row;

  line_t *line = &ROW(row);

  line->touch ();
  line->is_longer (0);

  // nuke wide spanning the start
  if (line->t[screen.cur.col] == NOCHAR)
    scr_kill_char (*line, screen.cur.col);

  switch (insdel)
    {
      case INSERT:
        line->l = min (line->l + count, ncol);

        if (line->t[screen.cur.col] == NOCHAR)
          scr_kill_char (*line, screen.cur.col);

        for (int col = ncol - 1; (col - count) >= screen.cur.col; col--)
          {
            line->t[col] = line->t[col - count];
            line->r[col] = line->r[col - count];
          }

        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 >= ncol))
              CLEAR_SELECTION ();
            else
              {
                /* shift selection */
                selection.beg.col  += count;
                selection.mark.col += count; /* XXX: yes? */
                selection.end.col  += count;
              }
          }

        scr_blank_line (*line, screen.cur.col, count, rstyle);
        break;

      case ERASE:
        screen.cur.col += count;     /* don't worry if > ncol */
        selection_check (1);
        screen.cur.col -= count;

        // nuke wide char after the end
        if (screen.cur.col + count < ncol && line->t[screen.cur.col + count] == NOCHAR)
          scr_kill_char (*line, screen.cur.col + count);

        scr_blank_line (*line, screen.cur.col, count, rstyle);
        break;

      case DELETE:
        line->l = max (line->l - count, 0);

        // nuke wide char spanning the end
        if (screen.cur.col + count < ncol && line->t[screen.cur.col + count] == NOCHAR)
          scr_kill_char (*line, screen.cur.col + count);

        for (int col = screen.cur.col; (col + count) < ncol; col++)
          {
            line->t[col] = line->t[col + count];
            line->r[col] = line->r[col + count];
          }

        scr_blank_line (*line, ncol - count, count, rstyle);

        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 >= 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 ecb_cold
rxvt_term::scr_scroll_region (int top, int bot) NOTHROW
{
  max_it (top, 0);
  min_it (bot, 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 ecb_cold
rxvt_term::scr_cursor_visible (int mode) NOTHROW
{
  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 ecb_cold
rxvt_term::scr_autowrap (int mode) NOTHROW
{
  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 ecb_cold
rxvt_term::scr_relative_origin (int mode) NOTHROW
{
  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 ecb_cold
rxvt_term::scr_insert_mode (int mode) NOTHROW
{
  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 ecb_cold
rxvt_term::scr_set_tab (int mode) NOTHROW
{
  if (mode < 0)
    memset (tabs, 0, ncol);
  else if (screen.cur.col < ncol)
    tabs [screen.cur.col] = !!mode;
}

/* ------------------------------------------------------------------------- */
/*
 * Set reverse/normal video
 * XTERM_SEQ: Reverse video: ESC [ ? 5 h
 * XTERM_SEQ: Normal video : ESC [ ? 5 l
 */
void
rxvt_term::scr_rvideo_mode (bool on) NOTHROW
{
  rvideo_mode = on;

#ifndef NO_BELL
  on ^= rvideo_bell;
#endif

  if (rvideo_state != on)
    {
      rvideo_state = on;

      ::swap (pix_colors[Color_fg], pix_colors[Color_bg]);
#ifdef HAVE_IMG
      if (bg_img == 0)
#endif
          XSetWindowBackground (dpy, vt, pix_colors[Color_bg]);

      XGCValues gcvalue;
      gcvalue.foreground = pix_colors[Color_fg];
      gcvalue.background = pix_colors[Color_bg];
      XChangeGC (dpy, gc, GCBackground | GCForeground, &gcvalue);

      scr_clear ();
      scr_touch (true);
    }
}

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

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

/*
 * Set font style
 */
void ecb_cold
rxvt_term::set_font_style () NOTHROW
{
#if 0
  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;
    }
#endif
}

/* ------------------------------------------------------------------------- */
/*
 * 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 ecb_cold
rxvt_term::scr_charset_choose (int set) NOTHROW
{
  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) NOTHROW
{
  charsets[set] = (unsigned char)ch;
  set_font_style ();
}


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

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

  for (int i = 0; i < nrow; i++)
    {
      rend_t *drp = drawn_buf[i].r;

      for (int col = 0; col < 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 ecb_hot
rxvt_term::scr_expose (int x, int y, int ewidth, int eheight, bool refresh) NOTHROW
{
  int i;
  row_col_t rc[RC_COUNT];

  if (!drawn_buf)  /* sanity check */
    return;

#ifndef NO_SLOW_LINK_SUPPORT
  if (refresh_type == FAST_REFRESH && !display->is_local)
    {
      y = 0;
      eheight = height;
    }
#endif

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

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

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

  num_scr_allow = 0;

  if (refresh)
    scr_refresh ();
}

/* ------------------------------------------------------------------------- */
/*
 * Refresh the entire screen
 */
void
rxvt_term::scr_touch (bool refresh) NOTHROW
{
  scr_expose (0, 0, vt_width, vt_height, refresh);
}

/* ------------------------------------------------------------------------- */
/*
 * Move the display so that the line represented by scrollbar value Y is at
 * the top of the screen
 */
void
rxvt_term::scr_move_to (int y, int len) NOTHROW
{
  // lerp (y, 0, len, top_row, nrow - 1)
  scr_changeview (top_row + (nrow - 1 - top_row) * y / len);
}

/* ------------------------------------------------------------------------- */
/*
 * Page the screen up/down nlines
 * direction should be UP or DN
 */
bool
rxvt_term::scr_page (int nlines) NOTHROW
{
  return scr_changeview (view_start - nlines);
}

bool
rxvt_term::scr_changeview (int new_view_start) NOTHROW
{
  clamp_it (new_view_start, top_row, 0);

  if (new_view_start == view_start)
    return false;

  num_scr += new_view_start - view_start;
  view_start = new_view_start;
  want_refresh = 1;

  HOOK_INVOKE ((this, HOOK_VIEW_CHANGE, DT_INT, view_start, DT_END));

  return true;
}

#ifndef NO_BELL
void
rxvt_term::bell_cb (ev::timer &w, int revents)
{
  rvideo_bell = false;
  scr_rvideo_mode (rvideo_mode);
  refresh_check ();
}
#endif

/* ------------------------------------------------------------------------- */
void
rxvt_term::scr_bell () NOTHROW
{
#ifndef NO_BELL

# ifndef NO_MAPALERT
#  ifdef MAPALERT_OPTION
  if (option (Opt_mapAlert))
#  endif
    XMapWindow (dpy, parent);
# endif

# if ENABLE_FRILLS
  if (option (Opt_urgentOnBell))
    set_urgency (1);
# endif

  if (option (Opt_visualBell))
    {
      rvideo_bell = true;
      scr_rvideo_mode (rvideo_mode);
      flush ();

      bell_ev.start (VISUAL_BELL_DURATION);
    }
  else
    XBell (dpy, 0);
  HOOK_INVOKE ((this, HOOK_BELL, DT_END));
#endif
}

/* ------------------------------------------------------------------------- */
void ecb_cold
rxvt_term::scr_printscreen (int fullhist) NOTHROW
{
#ifdef PRINTPIPE
  int nrows, row_start;
  FILE *fd = popen_printer ();

  if (!fd)
    return;

  if (fullhist)
    {
      nrows = nrow - top_row;
      row_start = top_row;
    }
  else
    {
      nrows = nrow;
      row_start = view_start;
    }

  wctomb (0, 0);

  for (int r1 = row_start; r1 < row_start + nrows; r1++)
    {
      text_t *tp = ROW(r1).t;
      int len    = ROW(r1).l;

      for (int i = len >= 0 ? len : ncol - 1; i--; ) //TODO//FIXME//LEN
        {
          char mb[MB_LEN_MAX];
          text_t t = *tp++;
          if (t == NOCHAR)
            continue;

          len = wctomb (mb, t);

          if (len <= 0)
            {
              mb[0] = ' ';
              len = 1;
            }

          fwrite (mb, 1, len, fd);
        }

      fputc ('\n', fd);
    }

  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.
 */
void ecb_hot
rxvt_term::scr_refresh () NOTHROW
{
  int16_t col, row,   /* column/row we're processing               */
          ocrow;      /* old cursor row                            */
  int i;              /* tmp                                       */
  rend_t ccol1,  /* Cursor colour       */
         ccol2;  /* Cursor colour2      */
  rend_t cur_rend;
  int cur_col;
  int cursorwidth;

  want_refresh = 0;        /* screen is current */

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

  /*
   * A: set up vars
   */
  refresh_count = 0;

  unsigned int old_screen_flags = screen.flags;
  bool have_bg = 0;
#ifdef HAVE_IMG
  have_bg = bg_img != 0;
#endif
  ocrow = oldcursor.row; /* is there an old outline cursor on screen? */

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

  HOOK_INVOKE ((this, HOOK_REFRESH_BEGIN, DT_END));
#if ENABLE_OVERLAY
  scr_swap_overlay ();
#endif

  bool showcursor = screen.flags & Screen_VisibleCursor;

  /*
   * C: set the cursor character (s)
   */
  {
#ifdef CURSOR_BLINK
    if (hidden_cursor)
      showcursor = 0;
#endif

    if (showcursor)
      {
        int col = screen.cur.col;

        while (col && ROW(screen.cur.row).t[col] == NOCHAR)
          col--;

        cursorwidth = 1;
        while (col + cursorwidth < ncol
               && ROW(screen.cur.row).t[col + cursorwidth] == NOCHAR)
          cursorwidth++;

        cur_rend = ROW(screen.cur.row).r[col];
        cur_col = col;

#ifndef NO_CURSORCOLOR
        if (ISSET_PIXCOLOR (Color_cursor))
          ccol1 = Color_cursor;
        else
#endif
#ifdef CURSOR_COLOR_IS_RENDITION_COLOR
          ccol1 = fgcolor_of (rstyle);
#else
          ccol1 = Color_fg;
#endif

#ifndef NO_CURSORCOLOR
        if (ISSET_PIXCOLOR (Color_cursor2))
          ccol2 = Color_cursor2;
        else
#endif
#ifdef CURSOR_COLOR_IS_RENDITION_COLOR
          ccol2 = bgcolor_of (rstyle);
#else
          ccol2 = Color_bg;
#endif

        if (focus && cursor_type == 0)
          {
            rend_t rend = cur_rend;

            rend ^= RS_RVid;
            rend = SET_FGCOLOR (rend, ccol1);
            rend = SET_BGCOLOR (rend, ccol2);

            scr_set_char_rend (ROW(screen.cur.row), cur_col, rend);
          }
      }

    /* make sure no outline cursor is left around */
    if (ocrow != -1 && ocrow < nrow && oldcursor.col < ncol)
      drawn_buf[ocrow].r[oldcursor.col] ^= (RS_RVid | RS_Uline);

    // save the current cursor coordinates if the cursor is visible
    // and either the window is unfocused or the cursor style is
    // underline or vertical bar, so as to clear the outline cursor in
    // the next refresh if the cursor moves or becomes invisible
    if (showcursor && (!focus || cursor_type != 0) && screen.cur.row - view_start < nrow)
      {
        oldcursor.row = screen.cur.row - view_start;
        oldcursor.col = screen.cur.col;
      }
    else
      oldcursor.row = -1;
  }

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

      j = nrow;
      wlen = len = -1;
      row = i > 0 ? 0 : j - 1;

      for (; j-- >= 0; row += (i > 0 ? 1 : -1))
        {
          if (row + i >= 0 && row + i < nrow && row + i != ocrow)
            {
              line_t s  = ROW(view_start + row);
              line_t d  = drawn_buf[row];
              line_t d2 = drawn_buf[row + i];

              for (nits = 0, col = ncol; col--; )
                if (s.t[col] != d2.t[col] || s.r[col] != d2.r[col])
                  nits--;
                else if (s.t[col] != d.t[col] || s.r[col] != d.r[col])
                  nits++;

              if (nits > 8) /* XXX: arbitrary choice */
                {
                  for (col = ncol; col--; )
                    {
                      *d.t++ = *d2.t++;
                      *d.r++ = *d2.r++;
                    }

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

                  wlen = row;
                  continue;
                }
            }

          if (len >= 0)
            {
              /* also comes here at end if needed because of >= above */
              if (wlen < len)
                ::swap (wlen, len);

              XGCValues gcv;

              gcv.graphics_exposures = 1; XChangeGC (dpy, gc, GCGraphicsExposures, &gcv);
              XCopyArea (dpy, vt, vt,
                         gc, 0, Row2Pixel (len + i),
                         (unsigned int)this->width,
                         (unsigned int)Height2Pixel (wlen - len + 1),
                         0, Row2Pixel (len));
              gcv.graphics_exposures = 0; XChangeGC (dpy, gc, GCGraphicsExposures, &gcv);

              len = -1;
            }
        }
    }
#endif

  /*
   * E: main pass across every character
   */
  for (row = 0; row < nrow; row++)
    {
      text_t *stp = ROW(view_start + row).t;
      rend_t *srp = ROW(view_start + row).r;
      text_t *dtp = drawn_buf[row].t;
      rend_t *drp = drawn_buf[row].r;

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

      for (col = 0; col < ncol; col++)
        {
          /* compare new text with old - if exactly the same then continue */
          if (stp[col] == dtp[col] && RS_SAME (srp[col], drp[col]))
            continue;

          // redraw one or more characters

          // seek to the beginning of wide characters
          while (ecb_unlikely (stp[col] == NOCHAR && col > 0))
            --col;

          rend_t rend = srp[col];     /* screen rendition (target rendition) */
          text_t *text = stp + col;
          int count = 1;

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

          int xpixel = Col2Pixel (col);

          for (i = 0; ++col < ncol; )
            {
              if (stp[col] == NOCHAR)
                {
                  dtp[col] = stp[col];
                  drp[col] = srp[col];

                  count++;
                  i++;

                  continue;
                }

              if (!RS_SAME (rend, srp[col]))
                break;

              count++;

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

                  dtp[col] = stp[col];
                  drp[col] = rend;
                  i = 0;
                }
              else if (have_bg || (stp[col] != ' ' && ++i >= 16))
                break;
            }

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

          // sometimes we optimize away the trailing NOCHAR's, add them back
          while (ecb_unlikely (i && text[count] == NOCHAR))
            count++, i--;

          /*
           * Determine the attributes for the string
           */
          int fore = fgcolor_of (rend); // desired foreground
          int back = bgcolor_of (rend); // desired background

          // only do special processing if any attributes are set, which is unlikely
          if (ecb_unlikely (rend & (RS_baseattrMask | RS_Careful | RS_Sel)))
            {
              bool invert = rend & RS_RVid;

#ifndef NO_BOLD_UNDERLINE_REVERSE
              if (rend & RS_Bold && fore == Color_fg)
                {
                  if (ISSET_PIXCOLOR (Color_BD))
                    fore = Color_BD;
# if !ENABLE_STYLES
                  else
                    invert = !invert;
# endif
                }

              if (rend & RS_Italic && fore == Color_fg)
                {
                  if (ISSET_PIXCOLOR (Color_IT))
                    fore = Color_IT;
# if !ENABLE_STYLES
                  else
                    invert = !invert;
# endif
                }

              if (rend & RS_Uline && fore == Color_fg && ISSET_PIXCOLOR (Color_UL))
                fore = Color_UL;
#endif

#ifdef OPTION_HC
              if (rend & RS_Sel)
                {
                  /* invert the column if no highlightColor is set or it is the
                   * current cursor column */
                  if (!(showcursor && row == screen.cur.row && text - stp == screen.cur.col)
                      && ISSET_PIXCOLOR (Color_HC))
                    {
                      if (ISSET_PIXCOLOR (Color_HTC))
                        fore = Color_HTC;
                      // if invert is 0 reverse video is set so we use bg color as fg color
                      else if (!invert)
                        fore = back;

                      back = Color_HC;
                      invert = 0;
                    }
                }
#endif

              if (invert)
                {
                    ::swap (fore, back);

#ifndef NO_BOLD_UNDERLINE_REVERSE
                  if (fore == back)
                    {
                      fore = Color_bg;
                      back = Color_fg;
                    }
#endif
                }

#ifdef TEXT_BLINK
              if (rend & RS_Blink && (back == Color_bg || fore == Color_bg))
                {
                  if (!text_blink_ev.is_active ())
                    {
                      text_blink_ev.again ();
                      hidden_text = 0;
                    }
                  else if (hidden_text)
                    fore = back;
                }
#endif

#if ENABLE_STYLES
              // "careful" (too wide) character handling

              // include previous careful character(s) if possible, looks nicer (best effort...)
              while (text > stp
                  && srp[text - stp - 1] & RS_Careful
                  && RS_SAME (rend, srp[text - stp - 1]))
                text--, count++, xpixel -= fwidth;

              // force redraw after "careful" characters to avoid pixel droppings
              for (int i = 0; srp[col + i] & RS_Careful && col + i < ncol - 1; i++)
                drp[col + i + 1] = srp[col + i + 1] ^ RS_redraw;

              // force redraw before "careful" characters to avoid pixel droppings
              for (int i = 0; srp[text - stp - i] & RS_Careful && text - i > stp; i++)
                drp[text - stp - i - 1] = srp[text - stp - i - 1] ^ RS_redraw;
#endif
            }

          /*
           * Actually do the drawing of the string here
           */
          rxvt_font *font = (*fontset[GET_STYLE (rend)])[GET_FONT (rend)];

          if (ecb_likely (have_bg && back == Color_bg))
            {
              // this is very ugly, maybe push it into ->draw?

              for (i = 0; i < count; i++) /* don't draw empty strings */
                if (text[i] != ' ')
                  {
                    font->draw (*drawable, xpixel, ypixel, text, count, fore, Color_transparent);
                    goto did_clear;
                  }

              CLEAR_CHARS (xpixel, ypixel, count);
              did_clear: ;
            }
          else
            font->draw (*drawable, xpixel, ypixel, text, count, fore, back);

          if (ecb_unlikely (rend & RS_Uline && font->descent > 1 && fore != back))
            {
              if (showcursor && focus && row == screen.cur.row
                  && IN_RANGE_EXC (col, cur_col, cur_col + cursorwidth))
                XSetForeground (dpy, gc, pix_colors[ccol1]);
              else
#if ENABLE_FRILLS
              if (ISSET_PIXCOLOR (Color_underline))
                XSetForeground (dpy, gc, pix_colors[Color_underline]);
              else
#endif
                XSetForeground (dpy, gc, pix_colors[fore]);

              XDrawLine (dpy, vt, 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 (focus)
        {
          if (cursor_type == 0)
            scr_set_char_rend (ROW(screen.cur.row), cur_col, cur_rend);
          else if (oldcursor.row >= 0)
            {
              XSetForeground (dpy, gc, pix_colors[ccol1]);
              if (cursor_type == 1)
                XFillRectangle (dpy, vt, gc,
                                Col2Pixel (cur_col),
                                Row2Pixel (oldcursor.row + 1) - 2,
                                Width2Pixel (1),
                                2);
              else
                XFillRectangle (dpy, vt, gc,
                                Col2Pixel (cur_col),
                                Row2Pixel (oldcursor.row),
                                2,
                                Height2Pixel (1));
            }
        }
      else if (oldcursor.row >= 0)
        {
          XSetForeground (dpy, gc, pix_colors[ccol1]);

          XDrawRectangle (dpy, vt, gc,
                          Col2Pixel (cur_col),
                          Row2Pixel (oldcursor.row),
                          (unsigned int) (Width2Pixel (cursorwidth) - 1),
                          (unsigned int) (Height2Pixel (1) - 1));
        }
    }

  /*
   * H: cleanup selection
   */
#if ENABLE_OVERLAY
  scr_swap_overlay ();
#endif
  HOOK_INVOKE ((this, HOOK_REFRESH_END, DT_END));

  scr_reverse_selection ();

  screen.flags = old_screen_flags;
  num_scr = 0;
  num_scr_allow = 1;
}

void ecb_cold
rxvt_term::scr_remap_chars (line_t &l) NOTHROW
{
  if (!l.valid ())
    return;

  l.touch (); // maybe a bit of an overkill, but it's not performance-relevant

  for (int i = ncol; i--; )
    l.r[i] = SET_FONT (l.r[i], FONTSET (l.r[i])->find_font (l.t[i]));
}

void ecb_cold
rxvt_term::scr_remap_chars () NOTHROW
{
  for (int i = total_rows; i--; )
    scr_remap_chars (row_buf [i]);

  for (int i = nrow; i--; )
    {
      scr_remap_chars (drawn_buf [i]);
      scr_remap_chars (swap_buf [i]);
    }
}

void ecb_cold
rxvt_term::scr_recolor (bool refresh) NOTHROW
{
  bool transparent = false;

#ifdef HAVE_IMG
  if (bg_img != 0)
    {
# if ENABLE_TRANSPARENCY
      if (bg_flags & BG_IS_TRANSPARENT)
        {
          XSetWindowBackgroundPixmap (dpy, parent, bg_img->pm);
          XSetWindowBackgroundPixmap (dpy, vt, ParentRelative);

          transparent = true;
        }
      else
# endif
        {
          XSetWindowBackground (dpy, parent, pix_colors[Color_border]);
          XSetWindowBackgroundPixmap (dpy, vt, bg_img->pm);
        }
    }
  else
#endif
    {
      XSetWindowBackground (dpy, parent, pix_colors[Color_border]);
      XSetWindowBackground (dpy, vt, pix_colors[Color_bg]);
    }

  XClearWindow (dpy, parent);

  if (scrollBar.state && scrollBar.win)
    {
      if (transparent)
        XSetWindowBackgroundPixmap (dpy, scrollBar.win, ParentRelative);
      else
        XSetWindowBackground (dpy, scrollBar.win, pix_colors[scrollBar.color ()]);
      scrollBar.state = SB_STATE_IDLE;
      scrollBar.show (0);
    }

  if (refresh)
    {
      scr_clear ();
      scr_touch (true);
    }
  want_refresh = 1;
}

/* ------------------------------------------------------------------------- */
void
rxvt_term::scr_clear (bool really) NOTHROW
{
  if (!mapped)
    return;

  num_scr_allow = 0;
  want_refresh = 1;

  if (really)
    XClearWindow (dpy, vt);
}

void
rxvt_term::scr_xor_rect (int beg_row, int beg_col, int end_row, int end_col, rend_t rstyle1, rend_t rstyle2) NOTHROW
{
  int view_end = view_start + nrow;
  int row, col;

  for (row = max (beg_row, view_start); row <= min (end_row, view_end); row++)
    {
      text_t *stp = ROW(row).t;
      rend_t *srp = ROW(row).r;

      for (col = beg_col; col < end_col; col++)
        srp[col] ^= rstyle1;

      while (col-- > beg_col && (stp[col] == NOCHAR || unicode::is_space (stp[col])))
        srp[col] ^= rstyle2;

      if (++col < end_col)
        srp[col] ^= rstyle2;
    }
}

void
rxvt_term::scr_xor_span (int beg_row, int beg_col, int end_row, int end_col, rend_t rstyle) NOTHROW
{
  int view_end = view_start + nrow;
  int row, col;

  if (beg_row >= view_start)
    {
      col = beg_col;
      row = beg_row;
    }
  else
    {
      col = 0;
      row = view_start;
    }

  for (; row < min (end_row, view_end); row++, col = 0)
    for (rend_t *srp = ROW(row).r; col < ncol; col++)
      srp[col] ^= rstyle;

  if (row == end_row)
    for (rend_t *srp = ROW(row).r; col < end_col; col++)
      srp[col] ^= rstyle;
}

/* ------------------------------------------------------------------------- */
void ecb_hot
rxvt_term::scr_reverse_selection () NOTHROW
{
  if (selection.op
      && current_screen == selection.screen
      && selection.end.row >= view_start)
    {
#if !ENABLE_MINIMAL
      if (selection.rect)
        scr_xor_rect (selection.beg.row, selection.beg.col,
                      selection.end.row, selection.end.col,
                      RS_Sel | RS_RVid, RS_Sel | RS_RVid | RS_Uline);
      else
#endif
        scr_xor_span (selection.beg.row, selection.beg.col,
                      selection.end.row, selection.end.col,
                      RS_Sel | 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) NOTHROW
{
  // if this method is needed, it can be implemented by factoring the
  // relevant code in scr_printscreen
}
#endif

/* ------------------------------------------------------------------------- *
 *                           CHARACTER SELECTION                             *
 * ------------------------------------------------------------------------- */
void
rxvt_term::selection_check (int check_more) NOTHROW
{
  if (!selection.op)
    return;

  if (!IN_RANGE_EXC (selection.beg.row, top_row, nrow)
      || !IN_RANGE_EXC (selection.mark.row, top_row, nrow)
      || !IN_RANGE_EXC (selection.end.row, top_row, nrow)
      || (check_more == 1
          && current_screen == selection.screen
          && !ROWCOL_IS_BEFORE (screen.cur, selection.beg)
          && ROWCOL_IS_BEFORE (screen.cur, selection.end)))
    CLEAR_ALL_SELECTION ();
}

void
rxvt_term::selection_changed () NOTHROW
{
  line_t &r1 = ROW (selection.beg.row);
  while (selection.beg.col < r1.l && r1.t [selection.beg.col] == NOCHAR)
    ++selection.beg.col;

  line_t &r2 = ROW (selection.end.row);
  while (selection.end.col < r2.l && r2.t [selection.end.col] == NOCHAR)
    ++selection.end.col;

  want_refresh = 1;
}

/* ------------------------------------------------------------------------- */
/*
 * Paste a selection direct to the command fd
 */
void
rxvt_term::tt_paste (char *data, unsigned int len) NOTHROW
{
  /* convert normal newline chars into common keyboard Return key sequence */
  for (unsigned int i = 0; i < len; i++)
    if (data[i] == C0_LF)
      data[i] = C0_CR;

  if (priv_modes & PrivMode_BracketPaste)
    tt_printf ("\x1b[200~");

  tt_write (data, len);

  if (priv_modes & PrivMode_BracketPaste)
    tt_printf ("\x1b[201~");
}

void
rxvt_term::paste (char *data, unsigned int len) NOTHROW
{
  if (HOOK_INVOKE ((this, HOOK_TT_PASTE, DT_STR_LEN, data, len, DT_END)))
    return;

  tt_paste (data, len);
}

/* ------------------------------------------------------------------------- */
/*
 * Request PRIMARY, SECONDARY or CLIPBOARD selection.
 * if the requested selection has no owner or is empty CUT_BUFFER0 is used
 * as fallback
 * EXT: button 2 release
 */
void
rxvt_term::selection_request (Time tm, int selnum) NOTHROW
{
  if (!selection_req)
    {
      selection_req = new rxvt_selection (display, selnum, tm, vt, xa[XA_VT_SELECTION], this);
      selection_req->run ();
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Clear all selected text
 * EXT: SelectionClear
 */
void
rxvt_term::selection_clear (bool clipboard) NOTHROW
{
  if (!clipboard)
    {
      want_refresh = 1;
      free (selection.text);
      selection.text = NULL;
      selection.len = 0;
      CLEAR_SELECTION ();

      if (display->selection_owner == this)
        display->selection_owner = 0;
    }
  else
    {
      free (selection.clip_text);
      selection.clip_text = NULL;
      selection.clip_len = 0;

      if (display->clipboard_owner == this)
        display->clipboard_owner = 0;
    }
}

/* ------------------------------------------------------------------------- */
/*
 * Copy a selection into the cut buffer
 * EXT: button 1 or 3 release
 */
void
rxvt_term::selection_make (Time tm)
{
  int size;
  wchar_t *new_selection_text;
  text_t *t;

  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 */

  if (HOOK_INVOKE ((this, HOOK_SEL_MAKE, DT_LONG, (long)tm, DT_END)))
    return;

  size = (selection.end.row - selection.beg.row + 1) * (ncol + 1);
  new_selection_text = (wchar_t *)rxvt_malloc ((size + 4) * sizeof (wchar_t));

  int ofs = 0;
  int extra = 0;

  int col = selection.beg.col;
  int row = selection.beg.row;

  int end_col;

  for (; row <= selection.end.row; row++, col = 0)
    {
#if !ENABLE_MINIMAL
      if (selection.rect)
        {
          col = selection.beg.col;
          end_col = selection.end.col;
        }
      else
#endif
        end_col = ROW(row).l;

      col = max (col, 0);

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

      t = ROW(row).t + col;

      for (; col < end_col; col++)
        {
          if (*t == NOCHAR)
            t++;
#if ENABLE_COMBINING
          else if (IS_COMPOSE (*t))
            {
              int len = rxvt_composite.expand (*t, 0);

              extra -= (len - 1);

              if (extra < 0)
                {
                  extra += size;
                  size += size;
                  new_selection_text = (wchar_t *)rxvt_realloc (new_selection_text, (size + 4) * sizeof (wchar_t));
                }

              ofs += rxvt_composite.expand (*t++, new_selection_text + ofs);
            }
#endif
          else
            new_selection_text[ofs++] = *t++;
        }

#if !ENABLE_MINIMAL
      if (selection.rect)
        {
          while (ofs
                 && new_selection_text[ofs - 1] != C0_LF
                 && unicode::is_space (new_selection_text[ofs - 1]))
            --ofs;

          new_selection_text[ofs++] = C0_LF;
        }
      else
#endif
        if (!ROW(row).is_longer ()
            && (row != selection.end.row || end_col != selection.end.col)
            && (row != selection.beg.row || selection.beg.col < ncol))
          new_selection_text[ofs++] = C0_LF;
    }

  new_selection_text[ofs] = 0;

  if (ofs == 0)
    {
      free (new_selection_text);
      return;
    }

  free (selection.text);

  // we usually allocate much more than necessary, so realloc it smaller again
  selection.len = ofs;
  selection.text = (wchar_t *)rxvt_realloc (new_selection_text, (ofs + 1) * sizeof (wchar_t));

  if (HOOK_INVOKE ((this, HOOK_SEL_GRAB, DT_LONG, (long)tm, DT_END)))
    return;

  selection_grab (tm);
}

bool
rxvt_term::selection_grab (Time tm, bool clipboard) NOTHROW
{
  Atom sel;

  if (!clipboard)
    {
      selection_time = tm;
      sel = XA_PRIMARY;
    }
  else
    {
      clipboard_time = tm;
      sel = xa[XA_CLIPBOARD];
    }

  XSetSelectionOwner (dpy, sel, vt, tm);
  if (XGetSelectionOwner (dpy, sel) == vt)
    {
      display->set_selection_owner (this, clipboard);
      return true;
    }
  else
    {
      selection_clear (clipboard);
      return false;
    }

#if 0
  XTextProperty ct;

  if (XwcTextListToTextProperty (dpy, &selection.text, 1, XStringStyle, &ct) >= 0)
    {
      set_string_property (XA_CUT_BUFFER0, ct.value, ct.nitems);
      XFree (ct.value);
    }
#endif
}

/* ------------------------------------------------------------------------- */
/*
 * Mark or select text based upon number of clicks: 1, 2, or 3
 * EXT: button 1 press
 */
void ecb_cold
rxvt_term::selection_click (int clicks, int x, int y) NOTHROW
{
  clicks = ((clicks - 1) % 3) + 1;
  selection.clicks = clicks;       /* save clicks so extend will work */

  if (clicks == 2 && !selection.rect
      && HOOK_INVOKE ((this, HOOK_SEL_EXTEND, DT_END)))
    {
      MEvent.clicks = 1; // what a mess
      selection.screen = current_screen;
      selection.op = SELECTION_CONT;
      return;
    }

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

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

/* ------------------------------------------------------------------------- */
/*
 * Mark a selection at the specified col/row
 */
void ecb_cold
rxvt_term::selection_start_colrow (int col, int row) NOTHROW
{
  want_refresh = 1;

  selection.mark.row = row + view_start;
  selection.mark.col = col;

  selection.mark.row = clamp (selection.mark.row, top_row, nrow - 1);
  selection.mark.col = clamp (selection.mark.col,       0, ncol - 1);

  while (selection.mark.col > 0
         && ROW(selection.mark.row).t[selection.mark.col] == NOCHAR)
    --selection.mark.col;

  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)         \
    (unicode::is_space (x) ? 2 : (x) <= 0xff && !!strchr (rs[Rs_cutchars], (x)))
#define DELIMIT_REND(x)        1

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

  if (dirn == UP)
    {
      bound.row = top_row - 1;
      bound.col = 0;
      dirnadd = -1;
    }
  else
    {
      bound.row = nrow;
      bound.col = ncol - 1;
      dirnadd = 1;
    }

  row = mark->row;
  col = max (mark->col, 0);

  /* find the edge of a word */
  stp = ROW(row).t + col; w1 = DELIMIT_TEXT (*stp);
  srp = ROW(row).r + col; w2 = DELIMIT_REND (*srp);

  for (;;)
    {
      for (; col != bound.col; col += dirnadd)
        {
          stp += dirnadd;
          srp += dirnadd;

          if (*stp == NOCHAR)
            continue;

          if (DELIMIT_TEXT (*stp) != w1)
            break;
          if (DELIMIT_REND (*srp) != w2)
            break;
        }

      if ((col == bound.col) && (row != bound.row))
        {
          if (ROW(row - (dirn == UP ? 1 : 0)).is_longer ())
            {
              trow = row + dirnadd;
              tcol = dirn == UP ? ncol - 1 : 0;

              if (!ROW(trow).t)
                break;

              stp = ROW(trow).t + tcol;
              srp = ROW(trow).r + tcol;

              if (DELIMIT_TEXT (*stp) != w1 || DELIMIT_REND (*srp) != w2)
                break;

              row = trow;
              col = tcol;
              continue;
            }
        }
      break;
    }

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

  /* Poke the values back in */
  ret->row = row;
  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 ecb_cold
rxvt_term::selection_extend (int x, int y, int flag) NOTHROW
{
  int col = clamp (Pixel2Col (x), 0, ncol);
  int row = clamp (Pixel2Row (y), 0, nrow - 1);

  /*
  * 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.clicks % 3) == 1) && !flag
      && (col == selection.mark.col
          && (row == selection.mark.row - view_start)))
    {
      /* select nothing */
      selection.beg.row = selection.end.row = 0;
      selection.beg.col = selection.end.col = 0;
      selection.clicks = 4;
      want_refresh = 1;
      return;
    }

  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 ecb_cold
rxvt_term::selection_extend_colrow (int32_t col, int32_t row, int button3, int buttonpress, int clickchange) NOTHROW
{
  row_col_t pos;
  enum {
    LEFT, RIGHT
  } closeto = RIGHT;

  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;
    }

  pos.col = col;
  pos.row = view_start + row;

  /*
   * 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)
    {
      if (selection.beg.col > ROW(selection.beg.row).l //TODO//FIXME//LEN
          && !ROW(selection.beg.row).is_longer ()
#if !ENABLE_MINIMAL
          && !selection.rect
#endif
         )
        selection.beg.col = ncol;

      if (
          selection.end.col > ROW(selection.end.row).l //TODO//FIXME//LEN
          && !ROW(selection.end.row).is_longer ()
#if !ENABLE_MINIMAL
          && !selection.rect
#endif
         )
        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)
    {
#if ENABLE_FRILLS
      if (option (Opt_tripleclickwords))
        {
          selection_delimit_word (UP, &selection.beg, &selection.beg);

          for (int end_row = selection.mark.row; end_row < nrow; end_row++)
            {
              if (!ROW(end_row).is_longer ())
                {
                  selection.end.row = end_row;
                  selection.end.col = ROW(end_row).l;
# if !ENABLE_MINIMAL
                  selection_remove_trailing_spaces ();
# endif
                  break;
                }
            }
        }
      else
#endif
        {
          if (ROWCOL_IS_AFTER (selection.mark, selection.beg))
            selection.mark.col++;

          selection.beg.col = 0;
          selection.end.col = ncol;

          // select a complete logical line
          while (selection.beg.row > -saveLines
                 && ROW(selection.beg.row - 1).is_longer ())
            selection.beg.row--;

          while (selection.end.row < nrow
                 && ROW(selection.end.row).is_longer ())
            selection.end.row++;
        }
    }

  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;
        }
    }

#if !ENABLE_MINIMAL
  if (selection.rect && selection.beg.col > selection.end.col)
    ::swap (selection.beg.col, selection.end.col);
#endif

  selection_changed ();
}

#if !ENABLE_MINIMAL
void ecb_cold
rxvt_term::selection_remove_trailing_spaces () NOTHROW
{
  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 = ROW(end_row).t;

      while (--end_col >= 0)
        {
          if (stp[end_col] != NOCHAR
              && !unicode::is_space (stp[end_col]))
            break;
        }

      if (end_col >= 0
          || !ROW(end_row - 1).is_longer ())
        {
          selection.end.col = end_col + 1;
          selection.end.row = end_row;
          break;
        }

      end_row--;
      end_col = 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 ecb_cold
rxvt_term::selection_rotate (int x, int y) NOTHROW
{
  selection.clicks = selection.clicks % 3 + 1;
  selection_extend_colrow (Pixel2Col (x), Pixel2Row (y), 1, 0, 1);
}

/* ------------------------------------------------------------------------- */
/*
 * Respond to a request for our current selection
 * EXT: SelectionRequest
 */
void ecb_cold
rxvt_term::selection_send (const XSelectionRequestEvent &rq) NOTHROW
{
  Atom property = rq.property == None ? rq.target : rq.property;
  XSelectionEvent ev;

  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])
    {
      Atom target_list[6];
      Atom *target = target_list;

      *target++ = xa[XA_TARGETS];
      *target++ = xa[XA_TIMESTAMP];
      *target++ = XA_STRING;
      *target++ = xa[XA_TEXT];
      *target++ = xa[XA_COMPOUND_TEXT];
#if X_HAVE_UTF8_STRING
      *target++ = xa[XA_UTF8_STRING];
#endif

      XChangeProperty (dpy, rq.requestor, property, XA_ATOM,
                       32, PropModeReplace,
                       (unsigned char *)target_list, target - target_list);
      ev.property = property;
    }
#if TODO // TODO
  else if (rq.target == xa[XA_MULTIPLE])
    {
      /* TODO: Handle MULTIPLE */
    }
#endif
  else if (rq.target == xa[XA_TIMESTAMP] && rq.selection == XA_PRIMARY && selection.text)
    {
      XChangeProperty (dpy, rq.requestor, property, rq.target,
                       32, PropModeReplace, (unsigned char *)&selection_time, 1);
      ev.property = property;
    }
  else if (rq.target == xa[XA_TIMESTAMP] && rq.selection == xa[XA_CLIPBOARD] && selection.clip_text)
    {
      XChangeProperty (dpy, rq.requestor, property, rq.target,
                       32, PropModeReplace, (unsigned char *)&clipboard_time, 1);
      ev.property = property;
    }
  else if (rq.target == XA_STRING
           || rq.target == xa[XA_TEXT]
           || rq.target == xa[XA_COMPOUND_TEXT]
           || rq.target == xa[XA_UTF8_STRING]
          )
    {
      XTextProperty ct;
      Atom target = rq.target;
      short freect = 0;
      int selectlen;
      wchar_t *cl;
      enum {
        enc_string        = XStringStyle,
        enc_text          = XStdICCTextStyle,
        enc_compound_text = XCompoundTextStyle,
#ifdef X_HAVE_UTF8_STRING
        enc_utf8          = XUTF8StringStyle,
#else
        enc_utf8          = -1,
#endif
      } style;

      if (target == XA_STRING)
        // we actually don't do XA_STRING, but who cares, as i18n clients
        // will ask for another format anyways.
        style = enc_string;
      else if (target == xa[XA_TEXT])
        style = enc_text;
      else if (target == xa[XA_COMPOUND_TEXT])
        style = enc_compound_text;
#if !ENABLE_MINIMAL
      else if (target == xa[XA_UTF8_STRING])
        style = enc_utf8;
#endif
      else
        {
          target = xa[XA_COMPOUND_TEXT];
          style = enc_compound_text;
        }

      if (rq.selection == XA_PRIMARY && selection.text)
        {
          cl = selection.text;
          selectlen = selection.len;
        }
      else if (rq.selection == xa[XA_CLIPBOARD] && selection.clip_text)
        {
          cl = selection.clip_text;
          selectlen = selection.clip_len;
        }
      else
        {
          cl = L"";
          selectlen = 0;
        }

#if !ENABLE_MINIMAL
      // xlib is horribly broken with respect to UTF8_STRING, and nobody cares to fix it
      // so recode it manually
      if (style == enc_utf8)
        {
          freect = 1;
          ct.encoding = target;
          ct.format = 8;
          ct.value = (unsigned char *)rxvt_wcstoutf8 (cl, selectlen);
          ct.nitems = strlen ((char *)ct.value);
        }
      else
#endif
      if (XwcTextListToTextProperty (dpy, &cl, 1, (XICCEncodingStyle) style, &ct) >= 0)
        freect = 1;
      else
        {
          /* if we failed to convert then send it raw */
          ct.value = (unsigned char *)cl;
          ct.nitems = selectlen;
          ct.encoding = target;
        }

      XChangeProperty (dpy, rq.requestor, property,
                       ct.encoding, 8, PropModeReplace,
                       ct.value, (int)ct.nitems);
      ev.property = property;

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

  XSendEvent (dpy, rq.requestor, False, 0L, (XEvent *)&ev);
}

/* ------------------------------------------------------------------------- */
#if USE_XIM
void ecb_cold
rxvt_term::im_set_position (XPoint &pos) NOTHROW
{
  XWindowAttributes xwa;

  XGetWindowAttributes (dpy, vt, &xwa);

  pos.x = xwa.x + Col2Pixel    (screen.cur.col);
  pos.y = xwa.y + Height2Pixel (screen.cur.row) + fbase;
}
#endif

#if ENABLE_OVERLAY
void
rxvt_term::scr_overlay_new (int x, int y, int w, int h) NOTHROW
{
  if (nrow < 1 || ncol < 1)
    return;

  want_refresh = 1;

  scr_overlay_off ();

  if (x < 0) x = ncol - w;
  if (y < 0) y = nrow - h;

  // make space for border
  w += 2; min_it (w, ncol);
  h += 2; min_it (h, nrow);

  x -= 1; clamp_it (x, 0, ncol - w);
  y -= 1; clamp_it (y, 0, nrow - h);

  ov.x = x; ov.y = y;
  ov.w = w; ov.h = h;

  ov.text = new text_t *[h];
  ov.rend = new rend_t *[h];

  for (y = 0; y < h; y++)
    {
      text_t *tp = ov.text[y] = new text_t[w];
      rend_t *rp = ov.rend[y] = new rend_t[w];

      text_t t0, t1, t2;
      rend_t r = OVERLAY_RSTYLE;

      if (y == 0)
        t0 = 0x2554, t1 = 0x2550, t2 = 0x2557;
      else if (y < h - 1)
        t0 = 0x2551, t1 = 0x0020, t2 = 0x2551;
      else
        t0 = 0x255a, t1 = 0x2550, t2 = 0x255d;

      *tp++ = t0;
      *rp++ = r;

      for (x = w - 2; x > 0; --x)
        {
          *tp++ = t1;
          *rp++ = r;
        }

      *tp = t2;
      *rp = r;
    }
}

void
rxvt_term::scr_overlay_off () NOTHROW
{
  if (!ov.text)
    return;

  want_refresh = 1;

  for (int y = 0; y < ov.h; y++)
    {
      delete [] ov.text[y];
      delete [] ov.rend[y];
    }

  delete [] ov.text; ov.text = 0;
  delete [] ov.rend; ov.rend = 0;
}

void
rxvt_term::scr_overlay_set (int x, int y, text_t text, rend_t rend) NOTHROW
{
  if (!ov.text || x >= ov.w - 2 || y >= ov.h - 2)
    return;

  x++, y++;

  ov.text[y][x] = text;
  ov.rend[y][x] = rend;
}

void
rxvt_term::scr_overlay_set (int x, int y, const char *s) NOTHROW
{
  while (*s)
    scr_overlay_set (x++, y, *s++);
}

void
rxvt_term::scr_overlay_set (int x, int y, const wchar_t *s) NOTHROW
{
  while (*s)
    {
      text_t t = *s++;
      int width = WCWIDTH (t);

      while (width--)
        {
          scr_overlay_set (x++, y, t);
          t = NOCHAR;
        }
    }
}

void
rxvt_term::scr_swap_overlay () NOTHROW
{
  if (!ov.text)
    return;

  // hide cursor if it is within the overlay area
  if (IN_RANGE_EXC (screen.cur.col - ov.x, 0, ov.w)
      && IN_RANGE_EXC (screen.cur.row - ov.y, 0, ov.h))
    screen.flags &= ~Screen_VisibleCursor;

  // swap screen mem with overlay
  for (int y = ov.h; y--; )
    {
      text_t *t1 = ov.text[y];
      rend_t *r1 = ov.rend[y];

      text_t *t2 = ROW(y + ov.y + view_start).t + ov.x;
      rend_t *r2 = ROW(y + ov.y + view_start).r + ov.x;

      for (int x = ov.w; x--; )
        {
          text_t t = *t1; *t1++ = *t2; *t2++ = t;
          rend_t r = *r1; *r1++ = *r2; *r2++ = SET_FONT (r, FONTSET (r)->find_font (t));
        }
    }
}

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

Revision:	1.455
Committed:	Wed Sep 30 12:57:04 2015 UTC (8 years, 7 months ago) by sf-exg
Content type:	text/plain
Branch:	MAIN
Changes since 1.454:	+2 -2 lines
Log Message:	Fix crash when the number of columns is 1 and a 0 width character is inserted. In scr_add_lines, in the case when a 0 width character must be inserted in the first column of the current row, the calculation of the previous character (i.e., the last character of the previous row) is bogus. In particular, if the number of columns is 1, the 'tp' pointer points to either the first or third byte (depending on the size of text_t) of the rendition of the previous character, which is therefore corrupted by the assignment '*tp = n'. This triggers a crash if the font id in the rendition gets changed to the id of a font which is not loaded. Bug reported by Kuang-che Wu.