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/* X Communication module for terminals which understand the X protocol.
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   Copyright (C) 1989, 1993 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Serious problems:

   Kludge: dup2 is used to put the X-connection socket into desc # 0
   so that wait_reading_process_input will wait for it in place of
   actual terminal input.
   
*/

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#define NEW_SELECTIONS

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/* On 4.3 these lose if they come after xterm.h.  */
/* On HP-UX 8.0 signal.h loses if it comes after config.h.  */
/* Putting these at the beginning seems to be standard for other .c files.  */
#include <stdio.h>
#include <signal.h>

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#include "config.h"

#ifdef HAVE_X_WINDOWS

#include "lisp.h"
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#include "blockinput.h"
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/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
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#include <X11/cursorfont.h>
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#ifndef USG
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/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
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#endif /* makedev */
#endif /* USG */
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#ifdef BSD
#include <sys/ioctl.h>
#include <strings.h>
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#else /* ! defined (BSD) */
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#ifndef VMS
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#include <string.h>
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#endif
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#endif /* ! defined (BSD) */
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#include "systty.h"
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#include "systime.h"
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#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
#include <sys/param.h>

#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
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#endif /* ! 0 */
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#include "gnu.h"
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#include "frame.h"
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#include "disptab.h"
#include "buffer.h"
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#include "window.h"
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#ifdef HAVE_X11
#define XMapWindow XMapRaised		/* Raise them when mapping. */
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#else /* ! defined (HAVE_X11) */
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#include <X/Xkeyboard.h>
/*#include <X/Xproto.h>	*/
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#endif /* ! defined (HAVE_X11) */
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/* For sending Meta-characters.  Do we need this? */
#define METABIT 0200

#define min(a,b) ((a)<(b) ? (a) : (b))
#define max(a,b) ((a)>(b) ? (a) : (b))

/* Nonzero means we must reprint all windows
   because 1) we received an ExposeWindow event
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   or 2) we received too many ExposeRegion events to record.
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   This is never needed under X11.  */
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static int expose_all_windows;

/* Nonzero means we must reprint all icon windows.  */

static int expose_all_icons;

#ifndef HAVE_X11
/* ExposeRegion events, when received, are copied into this queue
   for later processing.  */

static struct event_queue x_expose_queue;

/* ButtonPressed and ButtonReleased events, when received,
   are copied into this queue for later processing.  */

struct event_queue x_mouse_queue;
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#endif /* HAVE_X11 */
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#if defined (SIGIO) && defined (FIONREAD)
int BLOCK_INPUT_mask;
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#endif /* ! defined (SIGIO) && defined (FIONREAD) */
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/* The id of a bitmap used for icon windows.
   One such map is shared by all Emacs icon windows.
   This is zero if we have not yet had a need to create the bitmap.  */

static Bitmap icon_bitmap;

/* Font used for text icons.  */

static FONT_TYPE *icon_font_info;

/* Stuff for dealing with the main icon title. */

extern Lisp_Object Vcommand_line_args;
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char *hostname, *x_id_name;
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/* This is the X connection that we are using.  */

Display *x_current_display;

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/* The cursor to use for vertical scroll bars on x_current_display.  */
static Cursor x_vertical_scroll_bar_cursor;
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/* Frame being updated by update_frame.  This is declared in term.c.
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   This is set by update_begin and looked at by all the
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   XT functions.  It is zero while not inside an update.
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   In that case, the XT functions assume that `selected_frame'
   is the frame to apply to.  */
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extern struct frame *updating_frame;
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/* The frame (if any) which has the X window that has keyboard focus.
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   Zero if none.  This is examined by Ffocus_frame in frame.c.  Note
   that a mere EnterNotify event can set this; if you need to know the
   last frame specified in a FocusIn or FocusOut event, use
   x_focus_event_frame.  */
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struct frame *x_focus_frame;
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/* The last frame mentioned in a FocusIn or FocusOut event.  This is
   separate from x_focus_frame, because whether or not LeaveNotify
   events cause us to lose focus depends on whether or not we have
   received a FocusIn event for it.  */
struct frame *x_focus_event_frame;

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/* The frame which currently has the visual highlight, and should get
   keyboard input (other sorts of input have the frame encoded in the
   event).  It points to the X focus frame's selected window's
   frame.  It differs from x_focus_frame when we're using a global
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   minibuffer.  */
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static struct frame *x_highlight_frame;
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/* From .Xdefaults, the value of "emacs.WarpMouse".  If non-zero,
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   mouse is moved to inside of frame when frame is de-iconified.  */
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static int warp_mouse_on_deiconify;

/* During an update, maximum vpos for ins/del line operations to affect.  */

static int flexlines;

/* During an update, nonzero if chars output now should be highlighted.  */

static int highlight;

/* Nominal cursor position -- where to draw output.
   During an update, these are different from the cursor-box position.  */

static int curs_x;
static int curs_y;

#ifdef HAVE_X11
/* `t' if a mouse button is depressed. */

extern Lisp_Object Vmouse_depressed;

/* Tells if a window manager is present or not. */

extern Lisp_Object Vx_no_window_manager;

/* Timestamp that we requested selection data was made. */
extern Time requestor_time;

/* ID of the window requesting selection data. */
extern Window requestor_window;

/* Nonzero enables some debugging for the X interface code. */
extern int _Xdebug;

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#else /* ! defined (HAVE_X11) */
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/* Bit patterns for the mouse cursor.  */

short MouseCursor[] = {
  0x0000, 0x0008, 0x0018, 0x0038,
  0x0078, 0x00f8, 0x01f8, 0x03f8,
  0x07f8, 0x00f8, 0x00d8, 0x0188,
  0x0180, 0x0300, 0x0300, 0x0000};

short MouseMask[] = {
  0x000c, 0x001c, 0x003c, 0x007c,
  0x00fc, 0x01fc, 0x03fc, 0x07fc,
  0x0ffc, 0x0ffc, 0x01fc, 0x03dc,
  0x03cc, 0x0780, 0x0780, 0x0300};

static short grey_bits[] = {
  0x0005, 0x000a, 0x0005, 0x000a};

static Pixmap GreyPixmap = 0;
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#endif /* ! defined (HAVE_X11) */
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/* From time to time we get info on an Emacs window, here.  */

static WINDOWINFO_TYPE windowinfo;

extern int errno;

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/* A mask of extra modifier bits to put into every keyboard char.  */
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extern int extra_keyboard_modifiers;

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extern Display *XOpenDisplay ();
extern Window XCreateWindow ();

extern Cursor XCreateCursor ();
extern FONT_TYPE *XOpenFont ();

static void flashback ();

#ifndef HAVE_X11
static void dumpqueue ();
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#endif /* HAVE_X11 */
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void dumpborder ();
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static int XTcursor_to ();
static int XTclear_end_of_line ();
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/* Starting and ending updates. 

   These hooks are called by update_frame at the beginning and end
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   of a frame update.  We record in `updating_frame' the identity
   of the frame being updated, so that the XT... functions do not
   need to take a frame as argument.  Most of the XT... functions
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   should never be called except during an update, the only exceptions
   being XTcursor_to, XTwrite_char and XTreassert_line_highlight.  */

extern int mouse_track_top, mouse_track_left, mouse_track_width;

static
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XTupdate_begin (f)
     struct frame *f;
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{	
  int mask;

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  if (f == 0)
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    abort ();

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  flexlines = f->height;
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  highlight = 0;

  BLOCK_INPUT;
#ifndef HAVE_X11
  dumpqueue ();
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#endif /* HAVE_X11 */
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  UNBLOCK_INPUT;
}

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#ifndef HAVE_X11
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static void x_do_pending_expose ();
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#endif
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static
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XTupdate_end (f)
     struct frame *f;
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{	
  int mask;

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  if (updating_frame == 0
      || updating_frame != f)
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    abort ();

  BLOCK_INPUT;
#ifndef HAVE_X11
  dumpqueue ();
  x_do_pending_expose ();
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#endif /* HAVE_X11 */
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  x_display_cursor (f, 1);
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  XFlushQueue ();
  UNBLOCK_INPUT;
}

/* External interface to control of standout mode.
   Call this when about to modify line at position VPOS
   and not change whether it is highlighted.  */

XTreassert_line_highlight (new, vpos)
     int new, vpos;
{
  highlight = new;
}

/* Call this when about to modify line at position VPOS
   and change whether it is highlighted.  */

static
XTchange_line_highlight (new_highlight, vpos, first_unused_hpos)
     int new_highlight, vpos, first_unused_hpos;
{
  highlight = new_highlight;
  XTcursor_to (vpos, 0);
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  XTclear_end_of_line (updating_frame->width);
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}

/* This is used when starting Emacs and when restarting after suspend.
   When starting Emacs, no X window is mapped.  And nothing must be done
   to Emacs's own window if it is suspended (though that rarely happens).  */

static
XTset_terminal_modes ()
{
}

/* This is called when exiting or suspending Emacs.
   Exiting will make the X-windows go away, and suspending
   requires no action.  */

static
XTreset_terminal_modes ()
{
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/*  XTclear_frame ();  */
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}

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/* Set the nominal cursor position of the frame.
   This is where display update commands will take effect.
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   This does not affect the place where the cursor-box is displayed.  */

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static int
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XTcursor_to (row, col)
     register int row, col;
{
  int mask;
  int orow = row;

  curs_x = col;
  curs_y = row;

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  if (updating_frame == 0)
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    {
      BLOCK_INPUT;
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      x_display_cursor (selected_frame, 1);
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      XFlushQueue ();
      UNBLOCK_INPUT;
    }
}

/* Display a sequence of N glyphs found at GP.
   WINDOW is the x-window to output to.  LEFT and TOP are starting coords.
   HL is 1 if this text is highlighted, 2 if the cursor is on it.

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   FONT is the default font to use (for glyphs whose font-code is 0).
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   Since the display generation code is responsible for calling
   compute_char_face and compute_glyph_face on everything it puts in
   the display structure, we can assume that the face code on each
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   glyph is a valid index into FRAME_COMPUTED_FACES (f), and the one
   to which we can actually apply intern_face.  */
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#if 1
/* This is the multi-face code.  */
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static void
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dumpglyphs (f, left, top, gp, n, hl)
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     struct frame *f;
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     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
{
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  /* Holds characters to be displayed. */
  char *buf = (char *) alloca (f->width * sizeof (*buf));
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  register char *cp;		/* Steps through buf[]. */
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
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  Window window = FRAME_X_WINDOW (f);
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  while (n > 0)
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    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
      int g = *gp;

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      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
      cf = GLYPH_FACE (g);
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      /* Find the run of consecutive glyphs with the same face-code.
	 Extract their character codes into BUF.  */
      cp = buf;
      while (n > 0)
	{
	  g = *gp;
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	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
	  if (GLYPH_FACE (g) != cf)
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	    break;

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	  *cp++ = GLYPH_CHAR (g);
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	  --n;
	  ++gp;
	}

      /* LEN gets the length of the run.  */
      len = cp - buf;

      /* Now output this run of chars, with the font and pixel values
	 determined by the face code CF.  */
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      {
	struct face *face = FRAME_DEFAULT_FACE (f);
	FONT_TYPE *font = FACE_FONT (face);
	GC gc = FACE_GC (face);
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	int defaulted = 1;
	int gc_temporary = 0;
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	/* First look at the face of the text itself.  */
	if (cf != 0)
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	  {
	    /* The face codes on the glyphs must be valid indices into the
	       frame's face table.  */
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	    if (cf < 0 || cf >= FRAME_N_COMPUTED_FACES (f)
		|| FRAME_COMPUTED_FACES (f) [cf] == 0)
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	      abort ();

	    if (cf == 1)
	      face = FRAME_MODE_LINE_FACE (f);
	    else
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	      face = intern_face (f, FRAME_COMPUTED_FACES (f) [cf]);
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	    font = FACE_FONT (face);
	    gc = FACE_GC (face);
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	    defaulted = 0;
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	  }
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	/* Then comes the distinction between modeline and normal text.  */
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	else if (hl == 0)
	  ;
	else if (hl == 1)
	  {
	    face = FRAME_MODE_LINE_FACE (f);
	    font = FACE_FONT (face);
	    gc   = FACE_GC   (face);
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	    defaulted = 0;
	  }

#define FACE_DEFAULT (~0)

	/* Now override that if the cursor's on this character.  */
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	if (hl == 2)
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	  {
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	    if (defaulted
		|| !face->font
		|| (int) face->font == FACE_DEFAULT)
	      {
		gc = f->display.x->cursor_gc;
	      }
	    /* Cursor on non-default face: must merge.  */
	    else
	      {
		XGCValues xgcv;
		unsigned long mask;

		xgcv.background = f->display.x->cursor_pixel;
		xgcv.foreground = f->display.x->cursor_foreground_pixel;
		xgcv.font = face->font->fid;
		xgcv.graphics_exposures = 0;
		mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
		gc = XCreateGC (x_current_display, FRAME_X_WINDOW (f),
				mask, &xgcv);
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#if 0
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		if (face->stipple && face->stipple != FACE_DEFAULT)
		  XSetStipple (x_current_display, gc, face->stipple);
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#endif
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		gc_temporary = 1;
	      }
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	  }

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	if ((int) font == FACE_DEFAULT)
	  font = f->display.x->font;

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	XDrawImageString (x_current_display, window, gc,
			  left, top + FONT_BASE (font), buf, len);

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	if (gc_temporary)
	  XFreeGC (x_current_display, gc);

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	/* We should probably check for XA_UNDERLINE_POSITION and
	   XA_UNDERLINE_THICKNESS properties on the font, but let's
	   just get the thing working, and come back to that.  */
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	{
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	  int underline_position = 1;
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	  if (font->descent <= underline_position)
	    underline_position = font->descent - 1;
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	  if (face->underline)
	    XFillRectangle (x_current_display, FRAME_X_WINDOW (f),
			    FACE_GC (face),
			    left, (top
				   + FONT_BASE (font)
				   + underline_position),
			    len * FONT_WIDTH (font), 1);
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	}
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	left += len * FONT_WIDTH (font);
      }
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    }
}
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#endif /* 1 */

#if 0
/* This is the old single-face code.  */

static void
dumpglyphs (f, left, top, gp, n, hl, font)
     struct frame *f;
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
     FONT_TYPE *font;
{
  register int len;
  Window window = FRAME_X_WINDOW (f);
  GC drawing_gc =   (hl == 2 ? f->display.x->cursor_gc
		             : (hl ? f->display.x->reverse_gc
				   : f->display.x->normal_gc));

  if (sizeof (GLYPH) == sizeof (XChar2b))
    XDrawImageString16 (x_current_display, window, drawing_gc,
			left, top + FONT_BASE (font), (XChar2b *) gp, n);
  else if (sizeof (GLYPH) == sizeof (unsigned char))
    XDrawImageString (x_current_display, window, drawing_gc,
		      left, top + FONT_BASE (font), (char *) gp, n);
  else
    /* What size of glyph ARE you using?  And does X have a function to
       draw them?  */
    abort ();
}
#endif
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/* Output some text at the nominal frame cursor position.
   Advance the cursor over the text.
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   Output LEN glyphs at START.

   `highlight', set up by XTreassert_line_highlight or XTchange_line_highlight,
   controls the pixel values used for foreground and background.  */

static
XTwrite_glyphs (start, len)
     register GLYPH *start;
     int len;
{
  register int temp_length;
  int mask;
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  struct frame *f;
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  BLOCK_INPUT;

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  f = updating_frame;
  if (f == 0)
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    {
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      f = selected_frame;
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      /* If not within an update,
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	 output at the frame's visible cursor.  */
      curs_x = f->cursor_x;
      curs_y = f->cursor_y;
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    }

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  dumpglyphs (f,
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	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
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	      start, len, highlight);
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  /* If we drew on top of the cursor, note that it is turned off.  */
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  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && curs_x + len > f->phys_cursor_x)
    f->phys_cursor_x = -1;
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  if (updating_frame == 0)
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    {
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      f->cursor_x += len;
      x_display_cursor (f, 1);
      f->cursor_x -= len;
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    }
  else
    curs_x += len;

  UNBLOCK_INPUT;
}

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/* Clear to the end of the line.
   Erase the current text line from the nominal cursor position (inclusive)
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   to column FIRST_UNUSED (exclusive).  The idea is that everything
   from FIRST_UNUSED onward is already erased.  */
  
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static int
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XTclear_end_of_line (first_unused)
     register int first_unused;
{
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  struct frame *f = updating_frame;
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  int mask;

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  if (f == 0)
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    abort ();

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  if (curs_y < 0 || curs_y >= f->height)
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    return;
  if (first_unused <= 0)
    return;

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  if (first_unused >= f->width)
    first_unused = f->width;
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  BLOCK_INPUT;

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  /* Notice if the cursor will be cleared by this operation.  */
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  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && f->phys_cursor_x < first_unused)
    f->phys_cursor_x = -1;
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#ifdef HAVE_X11
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  XClearArea (x_current_display, FRAME_X_WINDOW (f),
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	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
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	      FONT_WIDTH (f->display.x->font) * (first_unused - curs_x),
	      FONT_HEIGHT (f->display.x->font), False);
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#else /* ! defined (HAVE_X11) */
  XPixSet (FRAME_X_WINDOW (f),
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	   CHAR_TO_PIXEL_COL (f, curs_x),
	   CHAR_TO_PIXEL_ROW (f, curs_y),
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	   FONT_WIDTH (f->display.x->font) * (first_unused - curs_x),
	   FONT_HEIGHT (f->display.x->font),
	   f->display.x->background_pixel);	
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#endif /* ! defined (HAVE_X11) */
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  UNBLOCK_INPUT;
}

static
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XTclear_frame ()
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{
  int mask;
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  struct frame *f = updating_frame;
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  if (f == 0)
    f = selected_frame;
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  f->phys_cursor_x = -1;	/* Cursor not visible.  */
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  curs_x = 0;			/* Nominal cursor position is top left.  */
  curs_y = 0;
  
  BLOCK_INPUT;
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  XClear (FRAME_X_WINDOW (f));
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  /* We have to clear the scroll bars, too.  If we have changed
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     colors or something like that, then they should be notified.  */
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  x_scroll_bar_clear (f);
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#ifndef HAVE_X11
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  dumpborder (f, 0);
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#endif /* HAVE_X11 */
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  XFlushQueue ();
  UNBLOCK_INPUT;
}

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/* Invert the middle quarter of the frame for .15 sec.  */

/* We use the select system call to do the waiting, so we have to make sure
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   it's available.  If it isn't, we just won't do visual bells.  */
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#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)

/* Subtract the `struct timeval' values X and Y,
   storing the result in RESULT.
   Return 1 if the difference is negative, otherwise 0.  */

static int
timeval_subtract (result, x, y)
     struct timeval *result, x, y;
{
  /* Perform the carry for the later subtraction by updating y.
     This is safer because on some systems
     the tv_sec member is unsigned.  */
  if (x.tv_usec < y.tv_usec)
    {
      int nsec = (y.tv_usec - x.tv_usec) / 1000000 + 1;
      y.tv_usec -= 1000000 * nsec;
      y.tv_sec += nsec;
    }
  if (x.tv_usec - y.tv_usec > 1000000)
    {
      int nsec = (y.tv_usec - x.tv_usec) / 1000000;
      y.tv_usec += 1000000 * nsec;
      y.tv_sec -= nsec;
    }

  /* Compute the time remaining to wait.  tv_usec is certainly positive.  */
  result->tv_sec = x.tv_sec - y.tv_sec;
  result->tv_usec = x.tv_usec - y.tv_usec;

  /* Return indication of whether the result should be considered negative.  */
  return x.tv_sec < y.tv_sec;
}
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XTflash (f)
     struct frame *f;
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{
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  BLOCK_INPUT;
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  {
    GC gc;
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    /* Create a GC that will use the GXxor function to flip foreground pixels
       into background pixels.  */
    {
      XGCValues values;
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      values.function = GXxor;
      values.foreground = (f->display.x->foreground_pixel
			   ^ f->display.x->background_pixel);
      
      gc = XCreateGC (x_current_display, FRAME_X_WINDOW (f),
		      GCFunction | GCForeground, &values);
    }
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    {
      int width  = PIXEL_WIDTH  (f);
      int height = PIXEL_HEIGHT (f);
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      XFillRectangle (x_current_display, FRAME_X_WINDOW (f), gc,
		      width/4, height/4, width/2, height/2);
      XFlush (x_current_display);
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      {
	struct timeval wakeup, now;
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	gettimeofday (&wakeup, (struct timezone *) 0);
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	/* Compute time to wait until, propagating carry from usecs.  */
	wakeup.tv_usec += 150000;
	wakeup.tv_sec += (wakeup.tv_usec / 1000000);
	wakeup.tv_usec %= 1000000;

	/* Keep waiting until past the time wakeup.  */
	while (1)
	  {
	    struct timeval timeout;

	    gettimeofday (&timeout, (struct timezone *)0);

	    /* In effect, timeout = wakeup - timeout.
	       Break if result would be negative.  */
	    if (timeval_subtract (&timeout, wakeup, timeout))
	      break;

	    /* Try to wait that long--but we might wake up sooner.  */
	    select (0, 0, 0, 0, &timeout);
	  }
      }
	
      XFillRectangle (x_current_display, FRAME_X_WINDOW (f), gc,
		      width/4, height/4, width/2, height/2);
      XFreeGC (x_current_display, gc);
      XFlush (x_current_display);
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    }
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  }

  UNBLOCK_INPUT;
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}

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#endif


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/* Make audible bell.  */

#ifdef HAVE_X11
#define XRINGBELL XBell(x_current_display, 0)
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#else /* ! defined (HAVE_X11) */
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#define XRINGBELL XFeep(0);
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#endif /* ! defined (HAVE_X11) */
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XTring_bell ()
{
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  if (x_current_display == 0)
    return;

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#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
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  if (visible_bell)
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    XTflash (selected_frame);
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  else
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#endif
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    {
      BLOCK_INPUT;
      XRINGBELL;
      XFlushQueue ();
      UNBLOCK_INPUT;
    }
}

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/* Insert and delete character.
   These are not supposed to be used because we are supposed to turn
   off the feature of using them.  */
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static 
XTinsert_glyphs (start, len)
     register char *start;
     register int len;
{
  abort ();
}

static 
XTdelete_glyphs (n)
     register int n;
{
  abort ();
}

/* Specify how many text lines, from the top of the window,
   should be affected by insert-lines and delete-lines operations.
   This, and those operations, are used only within an update
   that is bounded by calls to XTupdate_begin and XTupdate_end.  */

static
XTset_terminal_window (n)
     register int n;
{
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  if (updating_frame == 0)
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    abort ();

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  if ((n <= 0) || (n > updating_frame->height))
    flexlines = updating_frame->height;
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  else
    flexlines = n;
}

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/* Perform an insert-lines operation.
   Insert N lines at a vertical position curs_y.  */
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static void
stufflines (n)
     register int n;
{
  register int topregion, bottomregion;
  register int length, newtop, mask;
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  register struct frame *f = updating_frame;
  int intborder = f->display.x->internal_border_width;
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  if (curs_y >= flexlines)
    return;

  topregion = curs_y;
  bottomregion = flexlines - (n + 1);
  newtop = topregion + n;
  length = (bottomregion - topregion) + 1;

#ifndef HAVE_X11
  dumpqueue ();
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#endif /* HAVE_X11 */
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  if ((length > 0) && (newtop <= flexlines))
    {
#ifdef HAVE_X11
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      XCopyArea (x_current_display, FRAME_X_WINDOW (f),
		 FRAME_X_WINDOW (f), f->display.x->normal_gc,
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		 intborder, CHAR_TO_PIXEL_ROW (f, topregion),
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		 f->width * FONT_WIDTH (f->display.x->font),
		 length * FONT_HEIGHT (f->display.x->font), intborder,
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		 CHAR_TO_PIXEL_ROW (f, newtop));
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#else /* ! defined (HAVE_X11) */
      XMoveArea (FRAME_X_WINDOW (f),
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		 intborder, CHAR_TO_PIXEL_ROW (f, topregion),
		 intborder, CHAR_TO_PIXEL_ROW (f, newtop),
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		 f->width * FONT_WIDTH (f->display.x->font),
		 length * FONT_HEIGHT (f->display.x->font));
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      /* Now we must process any ExposeRegion events that occur
	 if the area being copied from is obscured.
	 We can't let it wait because further i/d operations
	 may want to copy this area to another area.  */
      x_read_exposes ();
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#endif /* ! defined (HAVE_X11) */
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    }

  newtop = min (newtop, (flexlines - 1));
  length = newtop - topregion;
  if (length > 0)
    {
#ifdef HAVE_X11
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      XClearArea (x_current_display, FRAME_X_WINDOW (f), intborder, 
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		  CHAR_TO_PIXEL_ROW (f, topregion),
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		  f->width * FONT_WIDTH (f->display.x->font),
		  n * FONT_HEIGHT (f->display.x->font), False);
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#else /* ! defined (HAVE_X11) */
      XPixSet (FRAME_X_WINDOW (f),
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	       intborder,
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	       CHAR_TO_PIXEL_ROW (f, topregion),
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	       f->width * FONT_WIDTH (f->display.x->font),
	       n * FONT_HEIGHT (f->display.x->font),
	       f->display.x->background_pixel);
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#endif /* ! defined (HAVE_X11) */
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    }
}

/* Perform a delete-lines operation, deleting N lines
   at a vertical position curs_y.  */

static void
scraplines (n)
     register int n;
{
  int mask;
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  register struct frame *f = updating_frame;
  int intborder = f->display.x->internal_border_width;
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  if (curs_y >= flexlines)
    return;

#ifndef HAVE_X11
  dumpqueue ();
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#endif /* HAVE_X11 */
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  if ((curs_y + n) >= flexlines)
    {
      if (flexlines >= (curs_y + 1))
	{
#ifdef HAVE_X11
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	  XClearArea (x_current_display, FRAME_X_WINDOW (f), intborder,
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		      CHAR_TO_PIXEL_ROW (f, curs_y),
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		      f->width * FONT_WIDTH (f->display.x->font),
		      (flexlines - curs_y) * FONT_HEIGHT (f->display.x->font), False);
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#else /* ! defined (HAVE_X11) */
	  XPixSet (FRAME_X_WINDOW (f),
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		   intborder, CHAR_TO_PIXEL_ROW (f, curs_y),
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		   f->width * FONT_WIDTH (f->display.x->font),
		   (flexlines - curs_y) * FONT_HEIGHT (f->display.x->font),
		   f->display.x->background_pixel);
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#endif /* ! defined (HAVE_X11) */
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	}
    }
  else
    {
#ifdef HAVE_X11
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      XCopyArea (x_current_display, FRAME_X_WINDOW (f),
		 FRAME_X_WINDOW (f), f->display.x->normal_gc,
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		 intborder,
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		 CHAR_TO_PIXEL_ROW (f, curs_y + n),
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		 f->width * FONT_WIDTH (f->display.x->font),
		 (flexlines - (curs_y + n)) * FONT_HEIGHT (f->display.x->font),
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		 intborder, CHAR_TO_PIXEL_ROW (f, curs_y));
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      XClearArea (x_current_display, FRAME_X_WINDOW (f),
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		  intborder,
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		  CHAR_TO_PIXEL_ROW (f, flexlines - n),
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		  f->width * FONT_WIDTH (f->display.x->font),
		  n * FONT_HEIGHT (f->display.x->font), False);
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#else /* ! defined (HAVE_X11) */
      XMoveArea (FRAME_X_WINDOW (f),
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		 intborder,
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		 CHAR_TO_PIXEL_ROW (f, curs_y + n),
		 intborder, CHAR_TO_PIXEL_ROW (f, curs_y),
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		 f->width * FONT_WIDTH (f->display.x->font),
		 (flexlines - (curs_y + n)) * FONT_HEIGHT (f->display.x->font));
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      /* Now we must process any ExposeRegion events that occur
	 if the area being copied from is obscured.
	 We can't let it wait because further i/d operations
	 may want to copy this area to another area.  */
      x_read_exposes ();
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      XPixSet (FRAME_X_WINDOW (f), intborder,
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	       CHAR_TO_PIXEL_ROW (f, flexlines - n),
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	       f->width * FONT_WIDTH (f->display.x->font),
	       n * FONT_HEIGHT (f->display.x->font), f->display.x->background_pixel);
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#endif /* ! defined (HAVE_X11) */
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    }
}

/* Perform an insert-lines or delete-lines operation,
   inserting N lines or deleting -N lines at vertical position VPOS.  */

XTins_del_lines (vpos, n)
     int vpos, n;
{
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  if (updating_frame == 0)
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    abort ();

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  /* Hide the cursor.  */
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  x_display_cursor (updating_frame, 0);
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  XTcursor_to (vpos, 0);

  BLOCK_INPUT;
  if (n >= 0)
    stufflines (n);
  else
    scraplines (-n);
  XFlushQueue ();
  UNBLOCK_INPUT;
}

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/* Support routines for exposure events.  */
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static void clear_cursor ();

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/* Output into a rectangle of an X-window (for frame F)
   the characters in f->phys_lines that overlap that rectangle.
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   TOP and LEFT are the position of the upper left corner of the rectangle.
   ROWS and COLS are the size of the rectangle.  */

static void
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dumprectangle (f, left, top, cols, rows)
     struct frame *f;
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     register int left, top, cols, rows;
{
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  register struct frame_glyphs *active_frame = FRAME_CURRENT_GLYPHS (f);
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  int cursor_cleared = 0;
  int bottom, right;
  register int y;

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  if (FRAME_GARBAGED_P (f))
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    return;

  /* Express rectangle as four edges, instead of position-and-size.  */
  bottom = top + rows;
  right = left + cols;

#ifndef HAVE_X11		/* Window manger does this for X11. */
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  {
    int intborder = f->display.x->internal_border_width;

    /* If the rectangle includes any of the internal border area,
       redisplay the border emphasis.  */
    if (top < intborder || left < intborder
	|| bottom > intborder + f->height * FONT_HEIGHT (f->display.x->font)
	|| right > intborder + f->width * FONT_WIDTH (f->display.x->font))
      dumpborder (f, 0);
  }
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#endif /* HAVE_X11		Window manger does this for X11. */
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  /* Convert rectangle edges in pixels to edges in chars.
     Round down for left and top, up for right and bottom.  */
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  top  = PIXEL_TO_CHAR_ROW (f, top);
  left = PIXEL_TO_CHAR_COL (f, left);
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  bottom += (FONT_HEIGHT (f->display.x->font) - 1);
  right += (FONT_WIDTH (f->display.x->font) - 1);
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  bottom = PIXEL_TO_CHAR_ROW (f, bottom);
  right = PIXEL_TO_CHAR_COL (f, right);
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  /* Clip the rectangle to what can be visible.  */
  if (left < 0)
    left = 0;
  if (top < 0)
    top = 0;
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  if (right > f->width)
    right = f->width;
  if (bottom > f->height)
    bottom = f->height;
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  /* Get size in chars of the rectangle.  */
  cols = right - left;
  rows = bottom - top;

  /* If rectangle has zero area, return.  */
  if (rows <= 0) return;
  if (cols <= 0) return;

  /* Turn off the cursor if it is in the rectangle.
     We will turn it back on afterward.  */
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  if ((f->phys_cursor_x >= left) && (f->phys_cursor_x < right)
      && (f->phys_cursor_y >= top) && (f->phys_cursor_y < bottom))
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    {
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      clear_cursor (f);
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      cursor_cleared = 1;
    }

  /* Display the text in the rectangle, one text line at a time.  */

  for (y = top; y < bottom; y++)
    {
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      GLYPH *line = &active_frame->glyphs[y][left];
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      if (! active_frame->enable[y] || left > active_frame->used[y])
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	continue;

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      dumpglyphs (f,
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		  CHAR_TO_PIXEL_COL (f, left),
		  CHAR_TO_PIXEL_ROW (f, y),
		  line, min (cols, active_frame->used[y] - left),
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		  active_frame->highlight[y]);
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    }

  /* Turn the cursor on if we turned it off.  */

  if (cursor_cleared)
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    x_display_cursor (f, 1);
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}

#ifndef HAVE_X11
/* Process all queued ExposeRegion events. */

static void
dumpqueue ()
{
  register int i;
  XExposeRegionEvent r;

  while (dequeue_event (&r, &x_expose_queue))
    {
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      struct frame *f = x_window_to_frame (r.window);
      if (f->display.x->icon_desc == r.window)
	refreshicon (f);
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      else
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	dumprectangle (f, r.x, r.y, r.width, r.height);
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    }
  XFlushQueue ();
}
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#endif /* HAVE_X11 */
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/* Process all expose events that are pending, for X10.
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   Redraws the cursor if necessary on any frame that
   is not in the process of being updated with update_frame.  */
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#ifndef HAVE_X11
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static void
x_do_pending_expose ()
{
  int mask;
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  struct frame *f;
  Lisp_Object tail, frame;
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  if (expose_all_windows)
    {
      expose_all_windows = 0;
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      for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
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	{
	  register int temp_width, temp_height;
	  int intborder;

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	  frame = XCONS (tail)->car;