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/* X Communication module for terminals which understand the X protocol.
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   Copyright (C) 1989, 1992 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.
   
*/

#include "config.h"

#ifdef HAVE_X_WINDOWS

#include "lisp.h"

/* On 4.3 this loses if it comes after xterm.h.  */
#include <signal.h>

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"

/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
#endif

#ifdef BSD
#include <sys/ioctl.h>
#include <strings.h>
#else
#include <sys/termio.h>
#include <string.h>
#endif

/* Allow m- file to inhibit use of FIONREAD.  */
#ifdef BROKEN_FIONREAD
#undef FIONREAD
#endif

/* We are unable to use interrupts if FIONREAD is not available,
   so flush SIGIO so we won't try.  */
#ifndef FIONREAD
#ifdef SIGIO
#undef SIGIO
#endif
#endif

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#include "systime.h"
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#include <fcntl.h>
#include <stdio.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"
#endif
#include "gnu.h"
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#include "frame.h"
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#include "disptab.h"
#include "buffer.h"

#ifdef HAVE_X11
#define XMapWindow XMapRaised		/* Raise them when mapping. */
#else
#include <X/Xkeyboard.h>
/*#include <X/Xproto.h>	*/
#endif /* HAVE_X11 */

/* 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
   or 2) we received too many ExposeRegion events to record.  */

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;
#endif

/* Nonzero after BLOCK_INPUT; prevents input events from being
   processed until later.  */

int x_input_blocked;

#if defined (SIGIO) && defined (FIONREAD)
int BLOCK_INPUT_mask;
#endif

/* Nonzero if input events came in while x_input_blocked was nonzero.
   UNBLOCK_INPUT checks for this.  */

int x_pending_input;

/* 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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Lisp_Object invocation_name;
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/* These are the current window manager hints.  It seems that
   XSetWMHints, when presented with an unset bit in the `flags' member
   of the hints structure, does not leave the corresponding attribute
   unchanged; rather, it resets that attribute to its default value.
   For example, unless you set the `icon_pixmap' field and the
   `IconPixmapHint' bit, XSetWMHints will forget what your icon pixmap
   was.  This is rather troublesome, since some of the members (for
   example, `input' and `icon_pixmap') want to stay the same
   throughout the execution of Emacs.  So, we keep this structure
   around, just leaving values in it and adding new bits to the mask
   as we go.  */
XWMHints x_wm_hints;

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/* This is the X connection that we are using.  */

Display *x_current_display;

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/* Frame being updated by update_frame.  */
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/* This is set by XTupdate_begin and looked at by all the
   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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static struct frame *updating_frame;
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/* The frame (if any) which has the X window that has keyboard focus.
   Zero if none.  This is examined by Ffocus_frame in frame.c.  */
struct frame *x_focus_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;

#else /* X10 stuff */

/* 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;
#endif /* X10 stuff */

/* From time to time we get info on an Emacs window, here.  */

static WINDOWINFO_TYPE windowinfo;

extern int errno;

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

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

static void flashback ();

#ifndef HAVE_X11
static void dumpqueue ();
#endif

void dumpborder ();
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static int XTcursor_to ();
static int XTclear_end_of_line ();
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/* These hooks are called by update_frame at the beginning and end
   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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  updating_frame = f;
  flexlines = f->height;
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  highlight = 0;

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

static void x_do_pending_expose ();

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 ();
#endif
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  adjust_scrollbars (f);
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  x_do_pending_expose ();

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  x_display_cursor (f, 1);
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  updating_frame = 0;
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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:
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   where display update commands will take effect.
   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.

   FONT is the default font to use (for glyphs whose font-code is 0).  */

static void
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dumpglyphs (f, left, top, gp, n, hl, font)
     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;
     FONT_TYPE *font;
{
  register int len;
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  Window window = f->display.x->window_desc;
  GC drawing_gc =   (hl == 2 ? f->display.x->cursor_gc
		             : (hl ? f->display.x->reverse_gc
				   : f->display.x->normal_gc));
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  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 ();
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}

#if 0
static void
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dumpglyphs (f, left, top, gp, n, hl, font)
     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;
     FONT_TYPE *font;
{
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  char buf[f->width]; /* Holds characters to be displayed. */
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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 = f->display.x->window_desc;
  int cursor_pixel = f->display.x->cursor_pixel;
  int fg_pixel = f->display.x->foreground_pixel;
  int bg_pixel = f->display.x->background_pixel;
  int intborder = f->display.x->internal_border_width;
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  while (n)
    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
      int g = *gp;

      while (GLYPH_ALIAS_P (tbase, tlen, g))
	g = GLYPH_ALIAS (tbase, g);
	
      cf = g >> 8;

      /* Find the run of consecutive glyphs with the same face-code.
	 Extract their character codes into BUF.  */
      cp = buf;
      while (n > 0)
	{
	  g = *gp;
	  while (GLYPH_ALIAS_P (tbase, tlen, g))
	    g = GLYPH_ALIAS (tbase, g);
	  if ((g >> 8) != cf)
	    break;

	  *cp++ = 0377 & g;
	  --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.  */
      if (cf == 0)
	{
#ifdef HAVE_X11
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	  GC GC_cursor = f->display.x->cursor_gc;
	  GC GC_reverse = f->display.x->reverse_gc;
	  GC GC_normal = f->display.x->normal_gc;
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	  XDrawImageString (x_current_display, window,
			    (hl == 2
			     ? GC_cursor
			     : (hl ? GC_reverse : GC_normal)),
			    left, top + FONT_BASE (font), buf, len);
#else
	  XText (window, left, top,
		 buf,
		 len,
		 font->id,
		 (hl == 2
		  ? (cursor_pixel == fg_pixel ? bg_pixel : fg_pixel)
		  : hl ? bg_pixel : fg_pixel),
		 (hl == 2 ? cursor_pixel
		  : hl ? fg_pixel : bg_pixel));
#endif /* HAVE_X11 */
	}
      else
	{
#ifdef HAVE_X11
	  if (FACE_IS_FONT (cf))
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	    XDrawImageString (x_current_display, f->display.x->window_desc,
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			      FACE_GC (cf),
			      left, top + FONT_BASE (FACE_FONT (cf)),
			      buf, len);
	  else if (FACE_IS_IMAGE (cf))
	    XCopyPlane (x_current_display, FACE_IMAGE (cf),
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			f->display.x->window_desc,
			f->display.x->normal_gc,
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			0, 0,
			FACE_IMAGE_WIDTH (cf),
			FACE_IMAGE_HEIGHT (cf), left, top);
	  else
	    abort ();
#else
	  register struct face *fp = x_face_table[cf];

	  XText (window, left, top,
		 buf,
		 len,
		 fp->font->id,
		 (hl == 2
		  ? (cursor_pixel == fp->fg ? fp->bg : fp->fg)
		  : hl ? fp->bg : fp->fg),
		 (hl == 2 ? cursor_pixel
		  : hl ? fp->fg : fp->bg));
#endif /* HAVE_X11 */
	}
      left += len * FONT_WIDTH (font);
    }
}
#endif

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/* Output some text at the nominal frame cursor position,
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   advancing the cursor over the text.
   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,
	     (curs_x * FONT_WIDTH (f->display.x->font)
	      + f->display.x->internal_border_width),
	     (curs_y * FONT_HEIGHT (f->display.x->font)
	      + f->display.x->internal_border_width),
	     start, len, highlight, f->display.x->font);
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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;
}

/* Erase the current text line from the nominal cursor position (inclusive)
   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, f->display.x->window_desc,
	      curs_x * FONT_WIDTH (f->display.x->font)
	      + f->display.x->internal_border_width,
	      curs_y * FONT_HEIGHT (f->display.x->font)
	      + f->display.x->internal_border_width,
	      FONT_WIDTH (f->display.x->font) * (first_unused - curs_x),
	      FONT_HEIGHT (f->display.x->font), False);
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#else
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  XPixSet (f->display.x->window_desc,
	   curs_x * FONT_WIDTH (f->display.x->font) + f->display.x->internal_border_width,
	   curs_y * FONT_HEIGHT (f->display.x->font) + f->display.x->internal_border_width,
	   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 /* HAVE_X11 */

  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 (f->display.x->window_desc);
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#ifndef HAVE_X11
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  dumpborder (f, 0);
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#endif
  XFlushQueue ();
  UNBLOCK_INPUT;
}

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/* Paint horzontal bars down the frame for a visible bell.
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   Note that this may be way too slow on some machines. */

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XTflash (f)
     struct frame *f;
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{
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  register struct frame_glyphs *active_frame = FRAME_CURRENT_GLYPHS (f);
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  register int i;
  int x, y;

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  if (updating_frame != 0)
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    abort ();

  BLOCK_INPUT;
#ifdef HAVE_X11
#if 0
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  for (i = f->height * FONT_HEIGHT (f->display.x->font) - 10;
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       i >= 0;    
       i -= 100)	   /* Should be NO LOWER than 75 for speed reasons. */
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    XFillRectangle (x_current_display, f->display.x->window_desc,
		    f->display.x->cursor_gc,
		    0, i, f->width * FONT_WIDTH (f->display.x->font)
		    + 2 * f->display.x->internal_border_width, 25);
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#endif

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  x = (f->width * FONT_WIDTH (f->display.x->font)) / 4;
  y = (f->height * FONT_HEIGHT (f->display.x->font)) / 4;
  XFillRectangle (x_current_display, f->display.x->window_desc,
		  f->display.x->cursor_gc,
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		  x, y, 2 * x, 2 * y);
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  dumpglyphs (f, (x + f->display.x->internal_border_width),
	     (y + f->display.x->internal_border_width),
	     &active_frame->glyphs[(f->height / 4) + 1][(f->width / 4)],
	     1, 0, f->display.x->font);
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#else /* X10 */
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  for (i = f->height * FONT_HEIGHT (f->display.x->font) - 10;
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       i >= 0;
       i -= 50)
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    XPixFill (f->display.x->window_desc, 0, i,
	      f->width * FONT_WIDTH (f->display.x->font)
	      + 2 * f->display.x->internal_border_width, 10,
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	      WHITE_PIX_DEFAULT, ClipModeClipped, GXinvert, AllPlanes);
#endif /* X10 */

  XFlushQueue ();
  UNBLOCK_INPUT;
}

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/* Flip background and forground colors of the frame. */
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x_invert_frame (f)
     struct frame *f;
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{
#ifdef HAVE_X11
  GC temp;
  unsigned long pix_temp;

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  x_display_cursor (f, 0);
  XClearWindow (x_current_display, f->display.x->window_desc);
  temp = f->display.x->normal_gc;
  f->display.x->normal_gc = f->display.x->reverse_gc;
  f->display.x->reverse_gc = temp;
  pix_temp = f->display.x->foreground_pixel;
  f->display.x->foreground_pixel = f->display.x->background_pixel;
  f->display.x->background_pixel = pix_temp;

  XSetWindowBackground (x_current_display, f->display.x->window_desc,
			f->display.x->background_pixel);
  if (f->display.x->background_pixel == f->display.x->cursor_pixel)
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    {
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      f->display.x->cursor_pixel = f->display.x->foreground_pixel;
      XSetBackground (x_current_display, f->display.x->cursor_gc,
		      f->display.x->cursor_pixel);
      XSetForeground (x_current_display, f->display.x->cursor_gc,
		      f->display.x->background_pixel);
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    }
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  redraw_frame (f);
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#endif /* X11 */
}

/* Make audible bell.  */

#ifdef HAVE_X11
#define XRINGBELL XBell(x_current_display, 0)
#else
#define XRINGBELL XFeep(0);
#endif

XTring_bell ()
{
  if (visible_bell)
#if 0
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    XTflash (selected_frame);
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#endif
    {
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      x_invert_frame (selected_frame);
      x_invert_frame (selected_frame);
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    }
  else
    {
      BLOCK_INPUT;
      XRINGBELL;
      XFlushQueue ();
      UNBLOCK_INPUT;
    }
}

/* Insert and delete character are not supposed to be used
   because we are supposed to turn off the feature of using them.  */

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;
}

/* Perform an insert-lines operation, inserting N lines
   at a vertical position curs_y.  */

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 ();
#endif

  if ((length > 0) && (newtop <= flexlines))
    {
#ifdef HAVE_X11
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      XCopyArea (x_current_display, f->display.x->window_desc,
		 f->display.x->window_desc, f->display.x->normal_gc,
		 intborder, topregion * FONT_HEIGHT (f->display.x->font) + intborder,
		 f->width * FONT_WIDTH (f->display.x->font),
		 length * FONT_HEIGHT (f->display.x->font), intborder,
		 newtop * FONT_HEIGHT (f->display.x->font) + intborder);
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#else
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      XMoveArea (f->display.x->window_desc,
		 intborder, topregion * FONT_HEIGHT (f->display.x->font) + intborder,
		 intborder, newtop * FONT_HEIGHT (f->display.x->font) + intborder,
		 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 ();
#endif /* HAVE_X11 */
    }

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

/* 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 ();
#endif

  if ((curs_y + n) >= flexlines)
    {
      if (flexlines >= (curs_y + 1))
	{
#ifdef HAVE_X11
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	  XClearArea (x_current_display, f->display.x->window_desc, intborder,
		      curs_y * FONT_HEIGHT (f->display.x->font) + intborder,
		      f->width * FONT_WIDTH (f->display.x->font),
		      (flexlines - curs_y) * FONT_HEIGHT (f->display.x->font), False);
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#else
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	  XPixSet (f->display.x->window_desc,
		   intborder, curs_y * FONT_HEIGHT (f->display.x->font) + intborder,
		   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 /* HAVE_X11 */
	}
    }
  else
    {
#ifdef HAVE_X11
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      XCopyArea (x_current_display, f->display.x->window_desc,
		 f->display.x->window_desc, f->display.x->normal_gc,
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		 intborder,
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		 (curs_y + n) * FONT_HEIGHT (f->display.x->font) + intborder,
		 f->width * FONT_WIDTH (f->display.x->font),
		 (flexlines - (curs_y + n)) * FONT_HEIGHT (f->display.x->font),
		 intborder, curs_y * FONT_HEIGHT (f->display.x->font) + intborder);
      XClearArea (x_current_display, f->display.x->window_desc,
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		  intborder,
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		  (flexlines - n) * FONT_HEIGHT (f->display.x->font) + intborder,
		  f->width * FONT_WIDTH (f->display.x->font),
		  n * FONT_HEIGHT (f->display.x->font), False);
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#else
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      XMoveArea (f->display.x->window_desc,
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		 intborder,
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		 (curs_y + n) * FONT_HEIGHT (f->display.x->font) + intborder,
		 intborder, curs_y * FONT_HEIGHT (f->display.x->font) + intborder,
		 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 (f->display.x->window_desc, intborder,
	       (flexlines - n) * FONT_HEIGHT (f->display.x->font) + intborder,
	       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 /* HAVE_X11 */
    }
}

/* 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;
}

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;

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  top -= f->display.x->internal_border_width;
  left -= f->display.x->internal_border_width;
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  /* 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. */
  /* If the rectangle includes any of the internal border area,
     redisplay the border emphasis.  */
  if (top < 0 || left < 0
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      || bottom > f->height * FONT_HEIGHT (f->display.x->font)
      || right > f->width * FONT_WIDTH (f->display.x->font))
    dumpborder (f, 0);
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#endif /* HAVE_X11 */
  
  /* 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 /= FONT_HEIGHT (f->display.x->font);
  left /= FONT_WIDTH (f->display.x->font);
  bottom += (FONT_HEIGHT (f->display.x->font) - 1);
  right += (FONT_WIDTH (f->display.x->font) - 1);
  bottom /= FONT_HEIGHT (f->display.x->font);
  right /= FONT_WIDTH (f->display.x->font);
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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,
		 (left * FONT_WIDTH (f->display.x->font)
		  + f->display.x->internal_border_width),
		 (y * FONT_HEIGHT (f->display.x->font)
		  + f->display.x->internal_border_width),
		 line, min (cols, active_frame->used[y] - left),
		 active_frame->highlight[y], f->display.x->font);
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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 ();
}
#endif

/* Process all expose events that are pending.
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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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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;
	  if (XTYPE (frame) != Lisp_Frame)
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	    continue;
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	  f = XFRAME (frame);
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	  if (! FRAME_X_P (f))
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	    continue;
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	  if (!f->visible)
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	    continue;
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	  if (!f->display.x->needs_exposure)
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	    continue;

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	  intborder = f->display.x->internal_border_width;
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	  clear_cursor (f);
	  XGetWindowInfo (f->display.x->window_desc, &windowinfo);
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	  temp_width = ((windowinfo.width - 2 * intborder
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			 - f->display.x->v_scrollbar_width)
			/ FONT_WIDTH (f->display.x->font));
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	  temp_height = ((windowinfo.height- 2 * intborder
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			  - f->display.x->h_scrollbar_height)
			 / FONT_HEIGHT (f->display.x->font));
	  if (temp_width != f->width || temp_height != f->height)
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	    {
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	      change_frame_size (f, max (1, temp_height),
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				  max (1, temp_width), 0, 1);
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	      x_resize_scrollbars (f);
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	    }
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	  f->display.x->left_pos = windowinfo.x;
	  f->display.x->top_pos = windowinfo.y;
	  dumprectangle (f, 0, 0, PIXEL_WIDTH (f), PIXEL_HEIGHT (f));
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#if 0
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	  dumpborder (f, 0);
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#endif
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	  f->display.x->needs_exposure = 0;
	  if (updating_frame != f)
	    x_display_cursor (f, 1);
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	  XFlushQueue ();
	}
    }
  else
    /* Handle any individual-rectangle expose events queued
       for various windows.  */
#ifdef HAVE_X11
    ;
#else
    dumpqueue ();
#endif
}

#ifdef HAVE_X11
static void
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frame_highlight (frame)
     struct frame *frame;
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{
  if (! EQ (Vx_no_window_manager, Qnil))
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    XSetWindowBorder (x_current_display, frame->display.x->window_desc,
		      frame->display.x->border_pixel);
  x_display_cursor (frame, 1);
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}

static void
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frame_unhighlight (frame)
     struct frame *frame;
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{
  if (! EQ (Vx_no_window_manager, Qnil))
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    XSetWindowBorderPixmap (x_current_display, frame->display.x->window_desc,
			    frame->display.x->border_tile);
  x_display_cursor (frame, 1);
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}
#else	/* X10 */
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/* Dump the border-emphasis of frame F.
   If F is selected, this is a lining of the same color as the border,
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   just within the border, occupying a portion of the internal border.
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   If F is not selected, it is background in the same place.
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   If ALWAYS is 0, don't bother explicitly drawing if it's background.

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   ALWAYS = 1 is used when a frame becomes selected or deselected.
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   In that case, we also turn the cursor off and on again
   so it will appear in the proper shape (solid if selected; else hollow.)  */

static void
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dumpborder (f, always)
     struct frame *f;
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     int always;
{
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  int thickness = f->display.x->internal_border_width / 2;
  int width = PIXEL_WIDTH (f);
  int height = PIXEL_HEIGHT (f);
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  int pixel;

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  if (f != selected_frame)
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    {
      if (!always)
	return;

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      pixel = f->display.x->background_pixel;
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    }
  else
    {
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      pixel = f->display.x->border_pixel;
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    }

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  XPixSet (f->display.x->window_desc, 0, 0, width, thickness, pixel);
  XPixSet (f->display.x->window_desc, 0, 0, thickness, height, pixel);
  XPixSet (f->display.x->window_desc, 0, height - thickness, width,
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	   thickness, pixel);
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  XPixSet (f->display.x->window_desc, width - thickness, 0, thickness,
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	   height, pixel);

  if (always)
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    x_display_cursor (f, 1);
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}
#endif	/* X10 */

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static void XTframe_rehighlight ();
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/* The focus has changed.  Update the frames as necessary to reflect
   the new situation.  Note that we can't change the selected frame
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   here, because the lisp code we are interrupting might become confused.
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   Each event gets marked with the frame in which it occured, so the
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   lisp code can tell when the switch took place by examining the events.  */
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static void
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x_new_focus_frame (frame)
     struct frame *frame;
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{
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  struct frame *old_focus = x_focus_frame;
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  int events_enqueued = 0;

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  if (frame != x_focus_frame)
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    {
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      /* Set this before calling other routines, so that they see 
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	 the correct value of x_focus_frame.  */
      x_focus_frame = frame;
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      if (old_focus && old_focus->auto_lower)
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	x_lower_frame (old_focus);
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#if 0
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      selected_frame = frame;
      XSET (XWINDOW (selected_frame->selected_window)->frame,
	    Lisp_Frame, selected_frame);
      Fselect_window (selected_frame->selected_window);
      choose_minibuf_frame ();
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#endif

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      if (x_focus_frame && x_focus_frame->auto_raise)
	x_raise_frame (x_focus_frame);
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    }
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  XTframe_rehighlight ();
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}


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/* The focus has changed, or we have make a frame's selected window
   point to a window on a different frame (this happens with global
   minibuffer frames).  Shift the highlight as appropriate.  */
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static void
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XTframe_rehighlight ()
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{
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  struct frame *old_highlight = x_highlight_frame;
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  if (x_focus_frame)
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    {
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      x_highlight_frame = XFRAME (FRAME_FOCUS_FRAME (x_focus_frame));
      if (x_highlight_frame->display.nothing == 0)
	XSET (FRAME_FOCUS_FRAME (x_focus_frame), Lisp_Frame,
	      (x_highlight_frame = x_focus_frame));
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    }
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  else
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    x_highlight_frame = 0;
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  if (x_highlight_frame != old_highlight)
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    {
      if (old_highlight)
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	frame_unhighlight (old_highlight);
      if (x_highlight_frame)
	frame_highlight (x_highlight_frame);
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    }
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}

enum window_type
{
  no_window,
  scrollbar_window,
  text_window,
};

/* Position of the mouse in characters */
unsigned int x_mouse_x, x_mouse_y;

/* Offset in buffer of character under the pointer, or 0. */
extern int mouse_buffer_offset;

extern int buffer_posn_from_coords ();

/* Symbols from xfns.c to denote the different parts of a window.  */
extern Lisp_Object Qmodeline_part, Qtext_part;

#if 0
/* Set *RESULT to an emacs input_event corresponding to MOTION_EVENT.
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   F is the frame in which the event occurred.
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   WINDOW_TYPE says whether the event happened in a scrollbar window
   or a text window, affecting the format of the event created.

   PART specifies which part of the scrollbar the event happened in,
   if WINDOW_TYPE == scrollbar_window.

   If the mouse is over the same character as the last time we checked,
   don't return an event; set result->kind to no_event.  */

static void
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notice_mouse_movement (result, motion_event, f, window_type, part)
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     struct input_event *result;
     XMotionEvent motion_event;
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     struct frame *f;
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     int window_type;
     Lisp_Object part;
{
  int x, y, root_x, root_y, pix_x, pix_y;
  unsigned int keys_and_buttons;
  Window w, root_window;

  /* Unless we decide otherwise below, return a non-event.  */
  result->kind = no_