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/* Implementation of GUI terminal on the Microsoft W32 API.
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   Copyright (C) 1989, 93, 94, 95, 96, 97, 98 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
the Free Software Foundation; either version 2, or (at your option)
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
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along with GNU Emacs; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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#include <signal.h>
#include <config.h>
#include <stdio.h>
#include "lisp.h"
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#include "charset.h"
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#include "fontset.h"
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#include "blockinput.h"

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#include "w32term.h"
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#include <shellapi.h>
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#include "systty.h"
#include "systime.h"

#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>

#include "frame.h"
#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
#include "window.h"
#include "keyboard.h"
#include "intervals.h"
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#include "coding.h"
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#undef min
#undef max
#define min(x, y) (((x) < (y)) ? (x) : (y))
#define max(x, y) (((x) > (y)) ? (x) : (y))

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/* Windows libraries do not define codepages other than ANSI and
   Unicode. We need all the ones for the languages that Emacs supports
   if languages other than that of the current locale are to be
   displayed under NT. */
#define CP_DEFAULT 1004
#define CP_SJIS     932
#define CP_GB2312   936
#define CP_BIG5     950
#define CP_KOREAN   949
#define CP_THAI     874
#define CP_LATIN1  1252
#define CP_LATIN2  1250
#define CP_LATIN3  1254
#define CP_LATIN4  1257
#define CP_CYRILLIC5  1251
#define CP_ARABIC6  1256
#define CP_GREEK7  1253
#define CP_HEBREW8  1255
#define CP_LATIN9  /*1258?*/
#define CP_VIETNAM  /*???*/

/* ENCODE_SJIS is defined in coding.h, but ENCODE_BIG5 is only in
   coding.c, so need our own copy here */
#define BIG5_SAME_ROW (0xFF - 0xA1 + 0x7F - 0x40)
#define ENCODE_BIG5(charset, c1, c2, b1, b2)			  	\
  do {								  	\
    unsigned int temp = (c1 - 0x21) * (0xFF - 0xA1) + (c2 - 0x21);	\
    if (charset == charset_big5_2)				  	\
      temp += BIG5_SAME_ROW * (0xC9 - 0xA1);			  	\
    b1 = temp / BIG5_SAME_ROW + 0xA1;				  	\
    b2 = temp % BIG5_SAME_ROW;					  	\
    b2 += b2 < 0x3F ? 0x40 : 0x62;				  	\
  } while (0)

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extern unsigned int msh_mousewheel;

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extern void free_frame_menubar ();

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extern Lisp_Object Vwindow_system;

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#define x_any_window_to_frame x_window_to_frame
#define x_top_window_to_frame x_window_to_frame


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/* This is display since w32 does not support multiple ones.  */
struct w32_display_info one_w32_display_info;
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/* This is a list of cons cells, each of the form (NAME . FONT-LIST-CACHE),
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   one for each element of w32_display_list and in the same order.
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   NAME is the name of the frame.
   FONT-LIST-CACHE records previous values returned by x-list-fonts.  */
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Lisp_Object w32_display_name_list;
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/* Frame being updated by update_frame.  This is declared in term.c.
   This is set by update_begin and looked at by all the
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   w32 functions.  It is zero while not inside an update.
   In that case, the w32 functions assume that `selected_frame'
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   is the frame to apply to.  */
extern struct frame *updating_frame;

/* This is a frame waiting to be autoraised, within w32_read_socket.  */
struct frame *pending_autoraise_frame;

/* 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;

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/* Flag to enable Unicode output in case users wish to use programs
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   like Twinbridge on '95 rather than installed system level support
   for Far East languages.  */
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int w32_enable_unicode_output;
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DWORD dwWindowsThreadId = 0;
HANDLE hWindowsThread = NULL;
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DWORD dwMainThreadId = 0;
HANDLE hMainThread = NULL;

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#ifndef SIF_ALL
/* These definitions are new with Windows 95. */
#define SIF_RANGE           0x0001
#define SIF_PAGE            0x0002
#define SIF_POS             0x0004
#define SIF_DISABLENOSCROLL 0x0008
#define SIF_TRACKPOS        0x0010
#define SIF_ALL             (SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS)

typedef struct tagSCROLLINFO
{
    UINT    cbSize;
    UINT    fMask;
    int     nMin;
    int     nMax;
    UINT    nPage;
    int     nPos;
    int     nTrackPos;
}   SCROLLINFO, FAR *LPSCROLLINFO;
typedef SCROLLINFO CONST FAR *LPCSCROLLINFO;
#endif /* SIF_ALL */

/* Dynamic linking to new proportional scroll bar functions. */
int (PASCAL *pfnSetScrollInfo) (HWND hwnd, int fnBar, LPSCROLLINFO lpsi, BOOL fRedraw);
BOOL (PASCAL *pfnGetScrollInfo) (HWND hwnd, int fnBar, LPSCROLLINFO lpsi);

int vertical_scroll_bar_min_handle;
int vertical_scroll_bar_top_border;
int vertical_scroll_bar_bottom_border;

int last_scroll_bar_drag_pos;

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/* Mouse movement. */

/* Where the mouse was last time we reported a mouse event.  */
static FRAME_PTR last_mouse_frame;
static RECT last_mouse_glyph;

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Lisp_Object Vw32_num_mouse_buttons;
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Lisp_Object Vw32_swap_mouse_buttons;
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/* Control whether x_raise_frame also sets input focus.  */
Lisp_Object Vw32_grab_focus_on_raise;

/* Control whether Caps Lock affects non-ascii characters.  */
Lisp_Object Vw32_capslock_is_shiftlock;

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/* Control whether right-alt and left-ctrl should be recognized as AltGr.  */
Lisp_Object Vw32_recognize_altgr;

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/* The scroll bar in which the last motion event occurred.

   If the last motion event occurred in a scroll bar, we set this
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   so w32_mouse_position can know whether to report a scroll bar motion or
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   an ordinary motion.

   If the last motion event didn't occur in a scroll bar, we set this
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   to Qnil, to tell w32_mouse_position to return an ordinary motion event.  */
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Lisp_Object last_mouse_scroll_bar;
int last_mouse_scroll_bar_pos;

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/* This is a hack.  We would really prefer that w32_mouse_position would
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   return the time associated with the position it returns, but there
   doesn't seem to be any way to wrest the timestamp from the server
   along with the position query.  So, we just keep track of the time
   of the last movement we received, and return that in hopes that
   it's somewhat accurate.  */
Time last_mouse_movement_time;

/* Incremented by w32_read_socket whenever it really tries to read events.  */
#ifdef __STDC__
static int volatile input_signal_count;
#else
static int input_signal_count;
#endif

extern Lisp_Object Vcommand_line_args, Vsystem_name;

extern Lisp_Object Qface, Qmouse_face;

extern int errno;

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

static Lisp_Object Qvendor_specific_keysyms;

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void w32_delete_display ();
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static void redraw_previous_char ();
static void redraw_following_char ();
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static unsigned int w32_get_modifiers ();
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static int fast_find_position ();
static void note_mouse_highlight ();
static void clear_mouse_face ();
static void show_mouse_face ();
static void do_line_dance ();

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/* Forward declarations for term hooks.  Consistency with the rest of Emacs
   requires the use of K&R functions prototypes.  However, MSVC does not
   pick up the function prototypes correctly with K&R function definitions,
   and so we declare them first to give a little help to MSVC.  */
static void w32_clear_frame ();
static void w32_clear_end_of_line (int);
static void w32_ins_del_lines (int, int);
static void w32_change_line_highlight (int, int, int);
static void w32_insert_glyphs (GLYPH *, int);
static void w32_write_glyphs (GLYPH *, int);
static void w32_delete_glyphs (int);
static void w32_ring_bell ();
static void w32_reset_terminal_modes ();
static void w32_set_terminal_modes ();
static void w32_update_begin (FRAME_PTR);
static void w32_update_end (FRAME_PTR);
static void w32_set_terminal_window (int);
extern int  w32_read_socket (int, struct input_event *, int, int);
static void w32_frame_up_to_date (FRAME_PTR);
static void w32_cursor_to (int, int);
static void w32_reassert_line_highlight (int, int);
static void w32_mouse_position (FRAME_PTR *, int, Lisp_Object *,
		enum scroll_bar_part *, Lisp_Object *,
		Lisp_Object *, unsigned long *);
static void w32_frame_rehighlight (FRAME_PTR);
static void w32_frame_raise_lower (FRAME_PTR, int);
static void w32_set_vertical_scroll_bar (struct window *, int, int, int);
static void w32_condemn_scroll_bars (FRAME_PTR);
static void w32_redeem_scroll_bar (struct window *);
static void w32_judge_scroll_bars (FRAME_PTR);
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#if 0
/* This is a function useful for recording debugging information
   about the sequence of occurrences in this file.  */

struct record 
{
  char *locus;
  int type;
};

struct record event_record[100];

int event_record_index;

record_event (locus, type)
     char *locus;
     int type;
{
  if (event_record_index == sizeof (event_record) / sizeof (struct record))
    event_record_index = 0;

  event_record[event_record_index].locus = locus;
  event_record[event_record_index].type = type;
  event_record_index++;
}

#endif /* 0 */

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/* Return the struct w32_display_info.  */
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struct w32_display_info *
w32_display_info_for_display ()
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{
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  return (&one_w32_display_info);
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}

void 
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w32_fill_rect (f, _hdc, pix, lprect)
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     FRAME_PTR f;
     HDC _hdc;
     COLORREF pix;
     RECT * lprect;
{
  HDC hdc;
  HBRUSH hb;
  RECT rect;
  
  if (_hdc)
    hdc = _hdc;
  else 
    {
      if (!f) return;
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      hdc = get_frame_dc (f);
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    }
  
  hb = CreateSolidBrush (pix);
  FillRect (hdc, lprect, hb);
  DeleteObject (hb);
  
  if (!_hdc)
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    release_frame_dc (f, hdc);
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}

void 
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w32_clear_window (f)
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     FRAME_PTR f;
{
  RECT rect;
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  GetClientRect (FRAME_W32_WINDOW (f), &rect);
  w32_clear_rect (f, NULL, &rect);
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}


/* Starting and ending updates.

   These hooks are called by update_frame at the beginning and end
   of a frame update.  We record in `updating_frame' the identity
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   of the frame being updated, so that the w32_... functions do not
   need to take a frame as argument.  Most of the w32_... functions
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   should never be called except during an update, the only exceptions
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   being w32_cursor_to, w32_write_glyphs and w32_reassert_line_highlight.  */
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static void
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w32_update_begin (f)
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     struct frame *f;
{
  if (f == 0)
    abort ();

  flexlines = f->height;
  highlight = 0;

  BLOCK_INPUT;

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  /* Regenerate display palette before drawing if list of requested
     colors has changed. */
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  if (FRAME_W32_DISPLAY_INFO (f)->regen_palette)
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  {
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    w32_regenerate_palette (f);
    FRAME_W32_DISPLAY_INFO (f)->regen_palette = FALSE;
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  }

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  if (f == FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_frame)
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    {
      /* Don't do highlighting for mouse motion during the update.  */
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      FRAME_W32_DISPLAY_INFO (f)->mouse_face_defer = 1;
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      /* If the frame needs to be redrawn,
	 simply forget about any prior mouse highlighting.  */
      if (FRAME_GARBAGED_P (f))
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	FRAME_W32_DISPLAY_INFO (f)->mouse_face_window = Qnil;
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      if (!NILP (FRAME_W32_DISPLAY_INFO (f)->mouse_face_window))
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	{
	  int firstline, lastline, i;
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	  struct window *w = XWINDOW (FRAME_W32_DISPLAY_INFO (f)->mouse_face_window);
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	  /* Find the first, and the last+1, lines affected by redisplay.  */
	  for (firstline = 0; firstline < f->height; firstline++)
	    if (FRAME_DESIRED_GLYPHS (f)->enable[firstline])
	      break;

	  lastline = f->height;
	  for (i = f->height - 1; i >= 0; i--)
	    {
	      if (FRAME_DESIRED_GLYPHS (f)->enable[i])
		break;
	      else
		lastline = i;
	    }

	  /* Can we tell that this update does not affect the window
	     where the mouse highlight is?  If so, no need to turn off.
	     Likewise, don't do anything if the frame is garbaged;
	     in that case, the FRAME_CURRENT_GLYPHS that we would use
	     are all wrong, and we will redisplay that line anyway.  */
	  if (! (firstline > (XFASTINT (w->top) + window_internal_height (w))
		 || lastline < XFASTINT (w->top)))
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	    clear_mouse_face (FRAME_W32_DISPLAY_INFO (f));
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	}
    }

  UNBLOCK_INPUT;
}

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static void
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w32_update_end (f)
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     struct frame *f;
{
  BLOCK_INPUT;

  do_line_dance ();
  x_display_cursor (f, 1);

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  if (f == FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_frame)
    FRAME_W32_DISPLAY_INFO (f)->mouse_face_defer = 0;
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  UNBLOCK_INPUT;
}

/* This is called after a redisplay on frame F.  */

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static void
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w32_frame_up_to_date (f)
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     FRAME_PTR f;
{
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  BLOCK_INPUT;
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  if (FRAME_W32_DISPLAY_INFO (f)->mouse_face_deferred_gc
      || f == FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_frame)
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    {
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      note_mouse_highlight (FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_frame,
			    FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_x,
			    FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_y);
      FRAME_W32_DISPLAY_INFO (f)->mouse_face_deferred_gc = 0;
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    }
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  UNBLOCK_INPUT;
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}

/* External interface to control of standout mode.
   Call this when about to modify line at position VPOS
   and not change whether it is highlighted.  */

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static void
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w32_reassert_line_highlight (new, vpos)
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     int new, vpos;
{
  highlight = new;
}

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

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static void
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w32_change_line_highlight (new_highlight, vpos, first_unused_hpos)
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     int new_highlight, vpos, first_unused_hpos;
{
  highlight = new_highlight;
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  w32_cursor_to (vpos, 0);
  w32_clear_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 window is mapped.  And nothing must be done
   to Emacs's own window if it is suspended (though that rarely happens).  */

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static void
w32_set_terminal_modes (void)
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{
}

/* This is called when exiting or suspending Emacs.
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   Exiting will make the W32 windows go away, and suspending
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   requires no action.  */

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static void
w32_reset_terminal_modes (void)
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{
}

/* Set the nominal cursor position of the frame.
   This is where display update commands will take effect.
   This does not affect the place where the cursor-box is displayed.  */

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static void
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w32_cursor_to (row, col)
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     register int row, col;
{
  int orow = row;

  curs_x = col;
  curs_y = row;

  if (updating_frame == 0)
    {
      BLOCK_INPUT;
      x_display_cursor (selected_frame, 1);
      UNBLOCK_INPUT;
    }
}
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int 
w32_codepage_for_charset (int charset)
{
  /* The codepage is only used to convert to unicode, so we only need
     to cover the languages that we may print via unicode.  */
  if (charset == charset_latin_iso8859_1)
    return CP_LATIN1;
  else if (charset == charset_big5_1 ||
           charset == charset_big5_2)
    return CP_BIG5;
  else if (charset == charset_jisx0208
   || charset == charset_jisx0208_1978
   || charset == charset_katakana_jisx0201
   || charset == charset_latin_jisx0201
   || charset == charset_id_internal ("japanese-jisx0212"))
    return CP_SJIS;
  else if (charset == charset_id_internal ("chinese-gb2312"))
    return CP_GB2312;
  else if (charset == charset_id_internal ("korean-ksc5601"))
    return CP_KOREAN;
  else if (charset == charset_id_internal ("latin-iso8859-2"))
    return CP_LATIN2;
  else if (charset == charset_id_internal ("latin-iso8859-3"))
    return CP_LATIN3;
  else if (charset == charset_id_internal ("latin-iso8859-4"))
    return CP_LATIN4;
  else if (charset == charset_id_internal ("cyrillic-iso8859-5"))
    return CP_CYRILLIC5;
  else if (charset == charset_id_internal ("arabic-iso8859-6"))
    return CP_ARABIC6;
  else if (charset == charset_id_internal ("greek-iso8859-7"))
    return CP_GREEK7;
  else if (charset == charset_id_internal ("hebrew-iso8859-8"))
    return CP_HEBREW8;
  else if (charset == charset_id_internal ("thai-tis620"))
    return CP_THAI;
  else               /* Don't care - return system default.  */
    return CP_DEFAULT;
}

BOOL 
w32_use_unicode_for_codepage (codepage)
{
  /* If the current codepage is supported, use Unicode for output. */
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  return (w32_enable_unicode_output
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          && codepage != CP_DEFAULT && IsValidCodePage (codepage));
}

/* Dealing with bits of wchar_t as if they were an XChar2B.  */
#define BUILD_WCHAR_T(byte1, byte2) \
 ((wchar_t)(((byte1 & 0x00ff) << 8) | (byte2 & 0x00ff)))


#define BYTE1(ch) \
 ((ch & 0xff00) >> 8)

#define BYTE2(ch) \
 (ch & 0x00ff)

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/* Display a sequence of N glyphs found at GP.
   WINDOW is the 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,
   3 if should appear in its mouse-face.
   JUST_FOREGROUND if 1 means draw only the foreground;
   don't alter the background.

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

   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
   glyph is a valid index into FRAME_COMPUTED_FACES (f), and the one
   to which we can actually apply intern_face.
   Call this function with input blocked.  */

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static int
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dumpglyphs (f, left, top, gp, n, hl, just_foreground, cmpcharp)
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     struct frame *f;
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
     int just_foreground;
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     struct cmpchar_info *cmpcharp;
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{
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  wchar_t *x_2byte_buffer
    = (wchar_t *) alloca (FRAME_WINDOW_WIDTH (f) * sizeof (*x_2byte_buffer));
  register wchar_t *cp;         /* Steps through x_2byte_buffer[].  */

  /* Allocate double the window width, as this buffer may contain MBCS
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     characters under w32.  Unsigned to let GetCharABCWidths work.  */
  unsigned char *x_1byte_buffer
    = (unsigned char *) alloca (2 * FRAME_WINDOW_WIDTH (f)
                                * sizeof (*x_1byte_buffer));
  register unsigned char *bp;       /* Steps through x_1byte_buffer[]. */ 
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  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
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  Window window = FRAME_W32_WINDOW (f);
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  HDC hdc = get_frame_dc (f);
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  int orig_left = left;
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  int gidx = 0;
  int i;
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  while (n > 0)
    {
      /* Get the face-code of the next GLYPH.  */
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      int cf, len, n_chars;
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      GLYPH g = *gp;
      int ch, charset;
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      Lisp_Object first_ch;
      /* HIGHEST and LOWEST are used while drawing a composite
         character.  The meanings are described later.  */
      int highest, lowest;
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      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
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      cf = (cmpcharp ? cmpcharp->face_work : FAST_GLYPH_FACE (g));
      ch = FAST_GLYPH_CHAR (g);
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      if (unibyte_display_via_language_environment
	  && SINGLE_BYTE_CHAR_P (ch)
	  && ch >= 160)
	ch = unibyte_char_to_multibyte (ch);
      if (gidx == 0) XSETFASTINT (first_ch, ch);
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      charset = CHAR_CHARSET (ch);
      if (charset == CHARSET_COMPOSITION)
	{
	  /* We must draw components of the composite character on the
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             same column.  */
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	  cmpcharp = cmpchar_table[COMPOSITE_CHAR_ID (ch)];

	  /* Set the face in the slot for work. */
	  cmpcharp->face_work = cf;

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	  /* We don't need the return value ... */
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	  dumpglyphs (f, left, top, cmpcharp->glyph, cmpcharp->glyph_len,
		      hl, just_foreground, cmpcharp);
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	  /* ... because the width of just drawn text can be
             calculated as follows.  */
	  left += FONT_WIDTH (FRAME_FONT (f)) * cmpcharp->width;

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	  ++gp, --n;
	  while (gp && (*gp & GLYPH_MASK_PADDING)) ++gp, --n;
	  cmpcharp = NULL;
	  continue;
	}
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      /* Find the run of consecutive glyphs which can be drawn with
	 the same DC (i.e. the same charset and the same face-code).
	 Extract their character codes into X_2BYTE_BUFFER.
	 If CMPCHARP is not NULL, face-code is not checked because we
	 use only the face specified in `cmpcharp->face_work'.  */
      cp = x_2byte_buffer;
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      while (n > 0)
	{
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	  int this_charset, c1, c2;
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	  g = *gp;
	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
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	  ch = FAST_GLYPH_CHAR (g);
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	  if (unibyte_display_via_language_environment
	      && SINGLE_BYTE_CHAR_P (ch)
	      && ch >= 160)
	    ch = unibyte_char_to_multibyte (ch);
	  SPLIT_CHAR (ch, this_charset, c1, c2);
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	  if (this_charset != charset
	      || (cmpcharp == NULL && FAST_GLYPH_FACE (g) != cf))
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	    break;

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	  if (c2 > 0)
	    *cp = BUILD_WCHAR_T (c1, c2);
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	  else
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	    *cp = BUILD_WCHAR_T (0, c1);
	  ++cp;
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	      ++gp, --n;
	  while (gp && (*gp & GLYPH_MASK_PADDING))
	    ++gp, --n;
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	}

      /* LEN gets the length of the run.  */
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      len = cp - x_2byte_buffer;
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      /* Now output this run of chars, with the font and pixel values
	 determined by the face code CF.  */
      {
	struct face *face = FRAME_DEFAULT_FACE (f);
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	XFontStruct *font = NULL;
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	COLORREF fg;
	COLORREF bg;
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	int stippled = 0;
	int line_height = FRAME_LINE_HEIGHT (f);
	/* Pixel width of each glyph in this run.  */
	int glyph_width
	  = (FONT_WIDTH (FRAME_FONT (f))
	     * (cmpcharp ? cmpcharp->width : CHARSET_WIDTH (charset)));
	/* Overall pixel width of this run.  */
	int run_width
	  = (FONT_WIDTH (FRAME_FONT (f))
	     * (cmpcharp ? cmpcharp->width : len * CHARSET_WIDTH (charset)));
	/* A flag to tell if we have already filled background.  We
	   fill background in advance in the following cases:
	   1) A face has stipple.
	   2) A height of font is shorter than LINE_HEIGHT.
	   3) Drawing a composite character.
	   4) Font has non-zero _MULE_BASELINE_OFFSET property.
	   After filling background, we draw glyphs by XDrawString16.  */
	int background_filled;
	/* Baseline position of a character, offset from TOP.  */
	int baseline;
	/* The property value of `_MULE_RELATIVE_COMPOSE' and
           `_MULE_DEFAULT_ASCENT'.  */
	int relative_compose = 0, default_ascent = 0;
	/* 1 if we find no font or a font of inappropriate size.  */
	int require_clipping;
        int codepage = CP_DEFAULT;
        BOOL print_via_unicode = FALSE;
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	/* HL = 3 means use a mouse face previously chosen.  */
	if (hl == 3)
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	  cf = FRAME_W32_DISPLAY_INFO (f)->mouse_face_face_id;
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	/* First look at the face of the text itself.  */
	if (cf != 0)
	  {
	    /* It's possible for the display table to specify
	       a face code that is out of range.  Use 0 in that case.  */
	    if (cf < 0 || cf >= FRAME_N_COMPUTED_FACES (f)
		|| FRAME_COMPUTED_FACES (f) [cf] == 0)
	      cf = 0;

	    if (cf == 1)
	      face = FRAME_MODE_LINE_FACE (f);
	    else
	      face = intern_face (f, FRAME_COMPUTED_FACES (f) [cf]);
	    if (FACE_STIPPLE (face))
	      stippled = 1;
	  }

	/* Then comes the distinction between modeline and normal text.  */
	else if (hl == 0)
	 ;
	else if (hl == 1)
	  {
	    face = FRAME_MODE_LINE_FACE (f);
	    if (FACE_STIPPLE (face))
	      stippled = 1;
	  }

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        /* Setting appropriate font and codepage for this charset.  */
        if (charset != CHARSET_ASCII)
          {
            int font_id;
            int fontset = FACE_FONTSET (face);
            struct font_info *fontp;

	    if ((fontset < 0 && (fontset = FRAME_FONTSET (f)) < 0)
		|| !(fontp = FS_LOAD_FONT (f, FRAME_W32_FONT_TABLE (f),
					   charset, NULL, fontset)))
	      goto font_not_found;

	    font = (XFontStruct *) (fontp->font);
            codepage = w32_codepage_for_charset (charset);
            print_via_unicode = w32_use_unicode_for_codepage (codepage);

            /* tmLastChar will only exceed 255 if TEXTMETRICW is used
               (ie on NT but not on 95). In this case there is no harm
               in being wrong, so have a go anyway.  */
            baseline = 
              (font->tm.tmLastChar > 255
                 ? (line_height + font->tm.tmAscent - font->tm.tmDescent) / 2
                 : f->output_data.w32->font_baseline - fontp->baseline_offset);
            if (FONT_HEIGHT (font) <= line_height
                && (font->tm.tmAscent > baseline
                    || font->tm.tmDescent > line_height - baseline))
              /* Adjust baseline for this font to show the whole
                 glyphs in a line.  */
              baseline = line_height - font->tm.tmDescent;

	    if (cmpcharp && cmpcharp->cmp_rule == NULL)
	      {
		relative_compose = fontp->relative_compose;
		default_ascent = fontp->default_ascent;
	      }

	    /* We have to change code points in the following cases. */
            if (charset == charset_big5_1
                 || charset == charset_big5_2)
              {
                /* Handle Big5 encoding specially rather than
                   requiring a CCL. */
                int big1, big2;
                for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
                  {
                    ENCODE_BIG5 (charset, BYTE1 (*cp), BYTE2 (*cp),
                                 big1, big2);
                    *cp = BUILD_WCHAR_T (big1, big2);
                  }
              }
	    else if (fontp->font_encoder)
	      {
		/* This font requires CCL program to calculate code
                   point of characters.  */
		struct ccl_program *ccl = fontp->font_encoder;

		if (CHARSET_DIMENSION (charset) == 1)
		  for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
		    {
		      ccl->reg[0] = charset;
		      ccl->reg[1] = BYTE2 (*cp);
		      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
		      /* We assume that MSBs are appropriately
                         set/reset by CCL program.  */
#if 0 /* this probably works under NT, but not under 95.  */
		      if (font->tm.tmLastChar < 256)	/* 1-byte font */
			*cp = BUILD_WCHAR_T (0, ccl->reg[1]);
		      else
			*cp = BUILD_WCHAR_T (ccl->reg[1], ccl->reg[2]);
#else /* Assume single dimensional charsets stay so.  */
                      *cp = BUILD_WCHAR_T (0, ccl->reg[1]);
#endif
                    }
		else
		  for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
		    {
		      ccl->reg[0] = charset;
		      ccl->reg[1] = BYTE1 (*cp) , ccl->reg[2] = BYTE2 (*cp);
		      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
		      /* We assume that MSBs are appropriately
                         set/reset by CCL program.  */
#if 0 /* this probably works under NT, but not under 95.  */
		      if (font->tm.tmLastChar < 256)	/* 1-byte font */
			*cp = BUILD_WCHAR_T (0, ccl->reg[1]);
		      else
			*cp = BUILD_WCHAR_T (ccl->reg[1],ccl->reg[2]);
#else /* Assume multidimensional charsets stay so.  */
                      *cp = BUILD_WCHAR_T (ccl->reg[1],ccl->reg[2]);
#endif
		    }
	      }
            /* Japanese Kanji are a special case under w32, as they
               must be printed in SJIS rather than EUC.  */
            else if ((charset == charset_jisx0208)
                     || (charset == charset_jisx0208_1978)
                     || (charset == charset_id_internal ("japanese-jisx0212")))
              {
                int sjis1, sjis2;
                for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
                  {
                    ENCODE_SJIS (BYTE1 (*cp), BYTE2 (*cp), sjis1, sjis2);
                    *cp = BUILD_WCHAR_T (sjis1, sjis2);
                  }
              }
	    else if (fontp->encoding[charset])
	      {
		int enc = fontp->encoding[charset];

		if ((enc == 1 || enc == 2) && CHARSET_DIMENSION (charset) == 2)
		  for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
		    *cp = BUILD_WCHAR_T (BYTE1 (*cp) | 0x80, BYTE2 (*cp));
		if (enc == 1 || enc == 3)
		  for (cp = x_2byte_buffer; cp < x_2byte_buffer + len; cp++)
		    *cp = BUILD_WCHAR_T (BYTE1 (*cp), BYTE2 (*cp) | 0x80);
	      }
	  }
	else
	  {
	  font_not_found:
	    if (charset == CHARSET_ASCII || charset == charset_latin_iso8859_1)
	      {
		font = FACE_FONT (face);
		if (!font || font == (XFontStruct *) FACE_DEFAULT)
		  font = FRAME_FONT (f);
		baseline = FONT_BASE (FRAME_FONT (f));
		if (charset == charset_latin_iso8859_1)
		  {
		    if (font->tm.tmLastChar < 0x80)
		      /* This font can't display Latin1 characters.  */
		      font = NULL;
		    else
		      {
			for (cp = x_2byte_buffer;
                             cp < x_2byte_buffer + len; cp++)
			  *cp = BUILD_WCHAR_T (BYTE1 (*cp),
                                               BYTE2 (*cp) | 0x80);
		      }
		  }
	      }
	  }

        /* Convert x_2byte_buffer into a buffer of single byte
           characters - possibly containing MBCS runs.  */
        bp = x_1byte_buffer;
        for (i = 0; i < len; i++)
          {
            if (BYTE1 (*(x_2byte_buffer + i)))
              *bp++ = BYTE1 (*(x_2byte_buffer + i));
            *bp++ = BYTE2 (*(x_2byte_buffer + i));
          }
        n_chars = bp - x_1byte_buffer;

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	fg = face->foreground;
	bg = face->background;

	/* Now override that if the cursor's on this character.  */
	if (hl == 2)
	  {
	    /* The cursor overrides stippling.  */
	    stippled = 0;

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	    if (font == FRAME_FONT (f)
		&& face->background == FRAME_BACKGROUND_PIXEL (f)
		&& face->foreground == FRAME_FOREGROUND_PIXEL (f)
		&& !cmpcharp)
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	      {
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		bg = f->output_data.w32->cursor_pixel;
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		fg = face->background;
	      }
	    /* Cursor on non-default face: must merge.  */
	    else
	      {
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		bg = f->output_data.w32->cursor_pixel;
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		fg = face->background;
		/* If the glyph would be invisible,
		   try a different foreground.  */
		if (fg == bg)
		  fg = face->foreground;
		if (fg == bg)
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		  fg = f->output_data.w32->cursor_foreground_pixel;
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		if (fg == bg)
		  fg = face->foreground;
		/* Make sure the cursor is distinct from text in this face.  */
		if (bg == face->background
		    && fg == face->foreground)
		  {
		    bg = face->foreground;
		    fg = face->background;
		  }
	      }
	  }

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	if (font)
	  require_clipping = (!NILP (Vclip_large_size_font)
			      && (font->tm.tmAscent > baseline
				  || font->tm.tmDescent >
                                     line_height - baseline
				  || (!cmpcharp
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				      && FONT_MAX_WIDTH (font) > glyph_width)));
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        if (font && (just_foreground || (cmpcharp && gidx > 0)))
          background_filled = 1;

        /* Stippling not supported under w32.  */

        else if (!font
                 || FONT_HEIGHT (font) < line_height
                 || FONT_WIDTH (font) < glyph_width
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                 || FONT_MAX_WIDTH (font) != FONT_WIDTH (font)
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                 || cmpcharp)
          {
	    /* Fill in the background for the current run.  */
            w32_fill_area (f, hdc, bg,
                           left,
                           top,
                           run_width,
                           line_height);
            background_filled = 1;
            if (cmpcharp)
              /* To assure not to fill background while drawing
                 remaining components.  */
              just_foreground = 1;
	  }
        else
          background_filled = 0;
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	SetBkMode (hdc, background_filled ? TRANSPARENT : OPAQUE);
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	SetTextColor (hdc, fg);
	SetBkColor (hdc, bg);

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        if ( print_via_unicode )
          n_chars = MultiByteToWideChar
            (codepage, 0, x_1byte_buffer, n_chars,
             x_2byte_buffer, FRAME_WINDOW_WIDTH (f));
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	if (font)
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	  {
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	    SelectObject (hdc, font->hfont);

            if (!cmpcharp)
	      {
                int multibyte_pos_offset = 0;
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                if (require_clipping || FONT_WIDTH (font) != glyph_width
                    || FONT_MAX_WIDTH (font) != FONT_WIDTH (font))
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                  {
                    RECT clip_rectangle;
                    LPRECT clip_region = NULL;
                    UINT fuOptions = 0;

                    for (i = 0; i < n_chars; i++)
                      {
                        if (require_clipping)
                          {
                            /* Set up a clipping rectangle for ExtTextOut */
                            fuOptions |= ETO_CLIPPED;
                            clip_rectangle.left = left + i * glyph_width;
                            clip_rectangle.right
                              = left + (i + 1) * glyph_width;
                            clip_rectangle.top = top;
                            clip_rectangle.bottom = top + line_height;
                            clip_region = &clip_rectangle;
			  }

                        /* baseline works differently on w32 than X,
                           leave it out for now.  */
                        if (print_via_unicode)
                          ExtTextOutW (hdc, left + glyph_width * i,
                                       top /*+ baseline*/, fuOptions,
                                       clip_region, x_2byte_buffer + i,
                                       1, NULL);
                        else if (CHARSET_DIMENSION (charset) > 1)
			  {
                            /* Keep character together */
                            int n = CHARSET_DIMENSION (charset) ;
                            ExtTextOut (hdc, left + multibyte_pos_offset,
                                        top /*+ baseline*/, fuOptions,
                                        clip_region, x_1byte_buffer + i,
                                        n, NULL);
                            /* fiddle i.  */
                            i += n - 1;
                            multibyte_pos_offset += glyph_width;
                          }
                        else
                          ExtTextOut (hdc, left + glyph_width * i,
                                      top /*+ baseline*/, fuOptions,
                                      clip_region, x_1byte_buffer + i,
                                      1, NULL);
                      }
		  }
                else
                  {
                    /* Print the whole run of characters.  */
                    if (print_via_unicode)
                      TextOutW (hdc, left, top /*+ baseline*/,
                                x_2byte_buffer, n_chars);
                    else
                      TextOut (hdc, left, top /*+ baseline*/,
                               x_1byte_buffer, n_chars);
                  }
              }
            else
              {
                /* Handle composite characters.  */
                RECT clip_rectangle;
                LPRECT clip_region = NULL;
                UINT fuOptions = 0;
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                ABC char_placement;
                int char_width = 0;
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                if (require_clipping)
		  {
                    /* Set up a clipping rectangle for ExtTextOut */
                    fuOptions |= ETO_CLIPPED;
                    clip_rectangle.left = left;
                    clip_rectangle.right = left + glyph_width;
                    clip_rectangle.top = top;
                    clip_rectangle.bottom = top + line_height;
                    clip_region = &clip_rectangle;
		  }
                if ((cmpcharp->cmp_rule || relative_compose)
                    && gidx == 0)
		  {
		    /* This is the first character.  Initialize variables.
		       HIGHEST is the highest position of glyphs ever
		       written, LOWEST the lowest position.  */
		    int x_offset = 0;

		    if (default_ascent
			&& CHAR_TABLE_P (Vuse_default_ascent)
			&& !NILP (Faref (Vuse_default_ascent, first_ch)))
		      {
			highest = default_ascent;
			lowest = 0;
		      }
		    else
		      {
                        /* Per char metrics not supported on w32 - use
                           font's metrics.  */
			highest = font->tm.tmAscent + 1;
			lowest = - font->tm.tmDescent;
		      }

		    if (cmpcharp->cmp_rule)
		      x_offset = (cmpcharp->col_offset[0]
				  * FONT_WIDTH (FRAME_FONT (f)));

                    i = 1;

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                    /* Truetype fonts often contain underhangs to
                       handle composition characters. This works
                       against our attempts to position the characters
                       manually, so we need to compensate for this.
                    */
                    if (print_via_unicode ?
                        GetCharABCWidthsW (hdc, *x_2byte_buffer,
                                           *x_2byte_buffer,
                                           &char_placement)
                        : GetCharABCWidths (hdc, *x_1byte_buffer,
                                            *x_1byte_buffer,
                                            &char_placement))
                      {
                        char_width = char_placement.abcA
                          + char_placement.abcB + char_placement.abcC;
                        x_offset += FONT_WIDTH (font) - char_width;
                      }
                    /* Don't let characters go beyond the glyph
                       boundary whatever their over/underhangs. */
                    if (x_offset > glyph_width - char_width)
                      x_offset = glyph_width - char_width;

                    if (x_offset < 0)
                      x_offset = 0;

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		    /* Draw the first character at the normal position.  */
                    if (print_via_unicode)
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                      ExtTextOutW (hdc, left + x_offset,
                                   top /*+ baseline*/,
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                                   fuOptions, clip_region,
                                   x_2byte_buffer, 1, NULL);
                    else if (CHARSET_DIMENSION (charset) > 1)
                      {
                        /* Keep character together */
                        int n = CHARSET_DIMENSION (charset) ;
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                        ExtTextOut (hdc, left + x_offset,
                                    top /*+ baseline*/,
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                                    fuOptions, clip_region,
                                    x_1byte_buffer, n, NULL);
                        /* fiddle i.  */
                        i += n - 1;
                      }
                    else
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                      ExtTextOut (hdc, left + x_offset,
                                  top /*+ baseline*/,
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                                  fuOptions, clip_region,
                                  x_1byte_buffer, 1, NULL);
                    gidx++;
                  }
                else
                  i = 0;

                for (; i < n_chars; i++, gidx++)
		  {
		    int x_offset = 0, y_offset = 0;

		    if (relative_compose)
		      {
			/* No per char metrics on w32.  */
			if (NILP (Vignore_relative_composition)
			    || NILP (Faref (Vignore_relative_composition,
					    make_number (cmpcharp->glyph[gidx]))))
			  {
			    if (- font->tm.tmDescent >= relative_compose)
			      {
				/* Draw above the current glyphs.  */
				y_offset = highest + font->tm.tmDescent;
				highest += font->tm.tmAscent
                                         + font->tm.tmDescent;
			      }
			    else if (font->tm.tmAscent <= 0)
			      {
				/* Draw beneath the current glyphs.  */
				y_offset = lowest - font->tm.tmAscent;
				lowest -= font->tm.tmAscent
                                        + font->tm.tmDescent;
			      }
			  }
			else
			  {
			    /* Draw the glyph at normal position.  If
                               it sticks out of HIGHEST or LOWEST,
                               update them appropriately.  */
			    if (font->tm.tmAscent > highest)
			      highest = font->tm.tmAscent;
			    else if (- font->tm.tmDescent < lowest)
			      lowest = - font->tm.tmDescent;
			  }
		      }
		    else if (cmpcharp->cmp_rule)
		      {
			int gref = (cmpcharp->cmp_rule[gidx] - 0xA0) / 9;
			int nref = (cmpcharp->cmp_rule[gidx] - 0xA0) % 9;
			int bottom, top;

			/* Re-encode GREF and NREF so that they specify
			   only Y-axis information:
			   0:top, 1:base, 2:bottom, 3:center  */
			gref = gref / 3 + (gref == 4) * 2;
			nref = nref / 3 + (nref == 4) * 2;

                        /* No per char metrics on w32.  */
			bottom = ((gref == 0 ? highest : gref == 1 ? 0
				   : gref == 2 ? lowest
				   : (highest + lowest) / 2)
				  - (nref == 0 ? font->tm.tmAscent
                                               + font->tm.tmDescent
				     : nref == 1 ? font->tm.tmDescent
                                     : nref == 2 ? 0
				     : (font->tm.tmAscent +
                                        font->tm.tmDescent) / 2));
			top = bottom + (font->tm.tmAscent +
                                        font->tm.tmDescent);
			if (top > highest)
			  highest = top;
			if (bottom < lowest)
			  lowest = bottom;
			y_offset = bottom + font->tm.tmDescent;
			x_offset = (cmpcharp->col_offset[gidx]
				    * FONT_WIDTH (FRAME_FONT(f)));
		      }

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                    /* Truetype fonts often contain underhangs to
                       handle composition characters. This works
                       against our attempts to position the characters
                       manually, so we need to compensate for this.
                    */
                    if (print_via_unicode ?
                        GetCharABCWidthsW (hdc, *(x_2byte_buffer + i),
                                           *(x_2byte_buffer + i),
                                           &char_placement)
                        : GetCharABCWidths (hdc, *(x_1byte_buffer + i),
                                            *(x_1byte_buffer + i),
                                            &char_placement))
                      {
                        char_width = char_placement.abcA
                          + char_placement.abcB + char_placement.abcC;
                        x_offset += FONT_WIDTH (font) - char_width;
                      }
                    /* Don't let characters go beyond the glyph
                       boundary whatever their over/underhangs. */
                    if (x_offset > glyph_width - char_width)
                      x_offset = glyph_width - char_width;

                    if (x_offset < 0)
                      x_offset = 0;

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                    if (print_via_unicode)
                      ExtTextOutW (hdc, left + x_offset,
                                   top /*+ baseline - y_offset*/,
                                   fuOptions, clip_region,
                                   x_2byte_buffer + i, 1, NULL);
                    else if (CHARSET_DIMENSION (charset) > 1)
                      {
                        /* Keep character together */
                        int n = CHARSET_DIMENSION (charset) ;
                        ExtTextOut (hdc, left + x_offset,
                                    top /*+ baseline - y_offset*/,
                                    fuOptions, clip_region,
                                    x_1byte_buffer + i, n, NULL);
                        /* fiddle i.  */
                        i += n - 1;
                      }
                    else
                      ExtTextOut (hdc, left + x_offset,
                                  top /*+ baseline - y_offset*/,
                                  fuOptions, clip_region,
                                  x_1byte_buffer + i, 1, NULL);
		  }
	      }
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	  }
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	if (!font)
	  {
	    /* Show rectangles to indicate that we found no font.  */
	    int limit = cmpcharp ? 1 : len;
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	    for (i = 0; i < limit; i++)
	      Rectangle (hdc, left + glyph_width * i, top,
                         left + glyph_width * (i + 1) - 1,
                         top + line_height - 1);
	  }
        else if (require_clipping && !NILP (Vhighlight_wrong_size_font))
          {
            /* Indicate that we found a font of inappropriate size.  */
            int limit = cmpcharp ? 1 : len;

            for (i = 0; i < limit; i++)
              {
                w32_fill_area (f, hdc, fg, left + glyph_width * i,
                               top + line_height - 1, glyph_width, 1);
                w32_fill_area (f, hdc, fg, left + glyph_width * i,
                               top + line_height - 3, 1, 2);
              }
          }
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	{
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	  /* Setting underline position based on the metric of the
	     current font results in shaky underline if it strides
	     over different fonts.  So, we set the position based only
	     on the default font of this frame.  */
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	  int underline_position = 1;

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	  if (FRAME_FONT (f)->tm.tmDescent <= underline_position)
	    underline_position = FRAME_FONT (f)->tm.tmDescent - 1;
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	  if (face->underline)
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	    w32_fill_area (f, hdc, fg, left,
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                           top + FONT_BASE (FRAME_FONT (f))
                           + underline_position,
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                           run_width, 1);
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	}

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	if (!cmpcharp)
	left += run_width;
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      }
    }
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  release_frame_dc (f, hdc);
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  return (left - orig_left);
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}


/* Output some text at the nominal frame cursor position.
   Advance the cursor over the text.
   Output LEN glyphs at START.

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   `highlight', set up by w32_reassert_line_highlight or w32_change_line_highlight,
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   controls the pixel values used for foreground and background.  */

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static void
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w32_write_glyphs (start, len)
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     register GLYPH *start;
     int len;
{
  register int temp_length;
  struct frame *f;

  BLOCK_INPUT;

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

  dumpglyphs (f,
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
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	      start, len, highlight, 0, NULL);
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  /* If we drew on top of the cursor, note that it is turned off.  */
  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;

  if (updating_frame == 0)
    {
      f->cursor_x += len;
      x_display_cursor (f, 1);
      f->cursor_x -= len;
    }
  else
    curs_x += len;

  UNBLOCK_INPUT;
}

/* Clear to the end of the line.
   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 void
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w32_clear_end_of_line (first_unused)
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     register int first_unused;
{
  struct frame *f = updating_frame;

  if (f == 0)
    abort ();

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

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  first_unused += FRAME_LEFT_SCROLL_BAR_WIDTH (f);

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  BLOCK_INPUT;

  do_line_dance ();

  /* Notice if the cursor will be cleared by this operation.  */
  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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  w32_clear_area (f, NULL,
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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->output_data.w32->font) * (first_unused - curs_x),
		    f->output_data.w32->line_height);
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  UNBLOCK_INPUT;
}

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static void
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w32_clear_frame ()
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{
  struct frame *f = updating_frame;

  if (f == 0)
    f = selected_frame;

  f->phys_cursor_x = -1;        /* Cursor not visible.  */
  curs_x = 0;                   /* Nominal cursor position is top left.  */
  curs_y = 0;

  BLOCK_INPUT;

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  w32_clear_window (f);
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  /* We have to clear the scroll bars, too.  If we have changed
     colors or something like that, then they should be notified.  */
  x_scroll_bar_clear (f);

  UNBLOCK_INPUT;
}

/* Make audible bell.  */

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static void
w32_ring_bell (void)
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{
  BLOCK_INPUT;

  if (visible_bell)
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    {
      int i;
      HWND hwnd = FRAME_W32_WINDOW (selected_frame);

      for (i = 0; i < 5; i++) 
	{
	  FlashWindow (hwnd, TRUE);
	  Sleep (10);
	}
      FlashWindow (hwnd, FALSE);
    }
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  else
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      w32_sys_ring_bell ();
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  UNBLOCK_INPUT;
}

/* 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 void
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w32_insert_glyphs (start, len)
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     register GLYPH *start;
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     register int len;
{
  abort ();
}

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static void
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w32_delete_glyphs (n)
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     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
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   that is bounded by calls to w32_update_begin and w32_update_end.  */
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static void
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w32_set_terminal_window (n)
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     register int n;
{
  if (updating_frame == 0)
    abort ();

  if ((n <= 0) || (n > updating_frame->height))
    flexlines = updating_frame->height;
  else
    flexlines = n;
}

/* These variables need not be per frame
   because redisplay is done on a frame-by-frame basis
   and the line dance for one frame is finished before
   anything is done for another frame.  */

/* Array of line numbers from cached insert/delete operations.
   line_dance[i] is the old position of the line that we want
   to move to line i, or -1 if we want a blank line there.  */
static int *line_dance;

/* Allocated length of that array.  */
static int line_dance_len;

/* Flag indicating whether we've done any work.  */
static int line_dance_in_progress;

/* Perform an insert-lines or delete-lines operation,
   inserting N lines or deleting -N lines at vertical position VPOS.  */
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static void
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w32_ins_del_lines (vpos, n)
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     int vpos, n;
{
  register int fence, i;

  if (vpos >= flexlines)
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    return;
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  if (!line_dance_in_progress)
    {
      int ht = updating_frame->height;
      if (ht > line_dance_len)
	{
	  line_dance = (int *)xrealloc (line_dance, ht * sizeof (int));
	  line_dance_len = ht;
	}
      for (i = 0; i < ht; ++i) line_dance[i] = i;
      line_dance_in_progress = 1;
    }
  if (n >= 0)
    {
      if (n > flexlines - vpos)
	n = flexlines - vpos;
      fence = vpos + n;
      for (i = flexlines; --i >= fence;)
	line_dance[i] = line_dance[i-n];
      for (i = fence; --i >= vpos;)
	line_dance[i] = -1;
    }
  else
    {
      n = -n;
      if (n > flexlines - vpos)
	n = flexlines - vpos;
      fence = flexlines - n;
      for (i = vpos; i < fence; ++i)
	line_dance[i] = line_dance[i + n];
      for (i = fence; i < flexlines; ++i)
	line_dance[i] = -1;
    }
}

/* Here's where we actually move the pixels around.
   Must be called with input blocked.  */
static void
do_line_dance ()
{
  register int i, j, distance;
  register struct frame *f;
  int ht;
  int intborder;
  HDC hdc;

  /* Must check this flag first.  If it's not set, then not only is the
     array uninitialized, but we might not even have a frame.  */
  if (!line_dance_in_progress)
    return;

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

  ht = f->height;
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  intborder = f->output_data.w32->internal_border_width;
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  x_display_cursor (updating_frame, 0);

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  hdc = get_frame_dc (f);
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  for (i = 0; i < ht; ++i)
    if (line_dance[i] != -1 && (distance = line_dance[i]-i) > 0)
      {
	for (j = i; (j < ht && line_dance[j] != -1
		     && line_dance[j]-j == distance); ++j);
	/* Copy [i,j) upward from [i+distance, j+distance) */
	BitBlt (hdc, 
		intborder, CHAR_TO_PIXEL_ROW (f, i+distance),
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		f->width * FONT_WIDTH (f->output_data.w32->font),
		(j-i) * f->output_data.w32->line_height, 
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		hdc,
		intborder, CHAR_TO_PIXEL_ROW (f, i),
		SRCCOPY);
	i = j-1;
      }

  for (i = ht; --i >=0; )
    if (line_dance[i] != -1 && (distance = line_dance[i]-i) < 0)
      {
	for (j = i; (--j >= 0 && line_dance[j] != -1
		     && line_dance[j]-j == distance););
	/* Copy (j, i] downward from (j+distance, i+distance] */
	BitBlt (hdc,
		intborder, CHAR_TO_PIXEL_ROW (f, j+1+distance),
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		f->width * FONT_WIDTH (f->output_data.w32->font),
		(i-j) * f->output_data.w32->line_height, 
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		hdc,
		intborder, CHAR_TO_PIXEL_ROW (f, j+1),
		SRCCOPY);
	i = j+1;
      }

  for (i = 0; i < ht; ++i)
    if (line_dance[i] == -1)
      {
	for (j = i; j < ht && line_dance[j] == -1; ++j);
	/* Clear [i,j) */
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	w32_clear_area (f, hdc,
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			  intborder, 
			  CHAR_TO_PIXEL_ROW (f, i),
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			  f->width * FONT_WIDTH (f->output_data.w32->font),
			  (j-i) * f->output_data.w32->line_height);
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	i = j-1;
      }
  line_dance_in_progress = 0;
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  release_frame_dc (f, hdc);
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}

/* Support routines for exposure events.  */
static void clear_cursor ();

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

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

  if (FRAME_GARBAGED_P (f))
    return;

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

  /* Convert rectangle edges in pixels to edges in chars.
     Round down for left and top, up for right and bottom.  */
  top  = PIXEL_TO_CHAR_ROW (f, top);
  left = PIXEL_TO_CHAR_COL (f, left);
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  bottom += (f->output_data.w32->line_height - 1);
  right += (FONT_WIDTH (f->output_data.w32->font) - 1);
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  bottom = PIXEL_TO_CHAR_ROW (f, bottom);
  right = PIXEL_TO_CHAR_COL (f, right);

  /* Clip the rectangle to what can be visible.  */
  if (left < 0)
    left = 0;
  if (top < 0)
    top = 0;
  if (right > f->width)
    right = f->width;
  if (bottom > f->height)
    bottom = f->height;

  /* 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.  */
  if ((f->phys_cursor_x >= left) && (f->phys_cursor_x < right)
      && (f->phys_cursor_y >= top) && (f->phys_cursor_y < bottom))
    {
      clear_cursor (f);
      cursor_cleared = 1;
    }

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

  for (y = top; y < bottom; y++)
    {
      GLYPH *line = &active_frame->glyphs[y][left];

      if (! active_frame->enable[y] || left > active_frame->used[y])
	continue;

      dumpglyphs (f,
		  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], 0, NULL);
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    }

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

  if (cursor_cleared)
    x_display_cursor (f, 1);
}

static void
frame_highlight (f)
     struct frame *f;
{
  x_display_cursor (f, 1);
}

static void
frame_unhighlight (f)
     struct frame *f;
{
  x_display_cursor (f, 1);
}

static void x_frame_rehighlight ();

/* The focus has changed.  Update the frames as necessary to reflect
   the new situation.  Note that we can't change the selected frame
   here, because the Lisp code we are interrupting might become confused.
   Each event gets marked with the frame in which it occurred, so the
   Lisp code can tell when the switch took place by examining the events.  */

void
x_new_focus_frame (dpyinfo, frame)
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     struct w32_display_info *dpyinfo;
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     struct frame *frame;
{
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  struct frame *old_focus = dpyinfo->w32_focus_frame;
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  int events_enqueued = 0;

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  if (frame != dpyinfo->w32_focus_frame)
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    {
      /* Set this before calling other routines, so that they see