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/* Implementation of GUI terminal on the Microsoft W32 API.
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   Copyright (C) 1989, 1993, 1994, 1995 Free Software Foundation, Inc.

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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/* Added by Kevin Gallo */

#include <signal.h>
#include <config.h>
#include <stdio.h>
#include "lisp.h"
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#include "charset.h"
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#include "blockinput.h"

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#include "w32term.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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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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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;
    }
}

/* 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.  */

static void
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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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{
  /* Holds characters to be displayed. */
  char *buf = (char *) alloca (f->width * sizeof (*buf));
  register char *cp;            /* Steps through buf[]. */
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
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  Window window = FRAME_W32_WINDOW (f);
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  int orig_left = left;
  HDC hdc;

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  hdc = get_frame_dc (f);
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  while (n > 0)
    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
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      GLYPH g = *gp;
      int ch, charset;
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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);
      charset = CHAR_CHARSET (ch);
      if (charset == CHARSET_COMPOSITION)
	{
  	  struct face *face = FRAME_DEFAULT_FACE (f);
	  XFontStruct *font = FACE_FONT (face);
	  /* We must draw components of the composite character on the
	     same column */
	  cmpcharp = cmpchar_table[COMPOSITE_CHAR_ID (ch)];

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

	  dumpglyphs (f, left, top, cmpcharp->glyph, cmpcharp->glyph_len,
		      hl, just_foreground, cmpcharp);
	  left += FONT_WIDTH (font) * cmpcharp->width;
	  ++gp, --n;
	  while (gp && (*gp & GLYPH_MASK_PADDING)) ++gp, --n;
	  cmpcharp = NULL;
	  continue;
	}
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      /* Find the run of consecutive glyphs with the same face-code.
	 Extract their character codes into BUF.  */
      cp = buf;
      while (n > 0)
	{
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	  int this_charset, c[2];

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	  g = *gp;
	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
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	  ch = FAST_GLYPH_CHAR (g);
	  SPLIT_CHAR (ch, this_charset, c[0], c[1]);
	  if (this_charset != charset
	      || (cmpcharp == NULL && FAST_GLYPH_FACE (g) != cf))
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	    break;

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	  if ( c[1] > 0 )
	    {
	      int consumed, produced;
	      /* Handle multibyte characters (still assuming user
	         selects correct font themselves for now */
	      produced = encode_terminal_code(gp, cp, 1,
			  (f->width*sizeof(*buf))-(cp-buf), &consumed);
		  /* If we can't display this glyph, skip it */
		  if (consumed == 0)
		  	  gp++,n--;
		  else
			gp += consumed, n-= consumed;
		  cp += produced;
		}
	  else
	    {
	      *cp++ = c[0];
	      ++gp, --n;
	    }
	  while (gp && (*gp & GLYPH_MASK_PADDING))
	    ++gp, --n;
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	}

      /* LEN gets the length of the run.  */
      len = cp - buf;
      /* Now output this run of chars, with the font and pixel values
	 determined by the face code CF.  */
      {
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	int stippled = 0;
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	struct face *face = FRAME_DEFAULT_FACE (f);
	XFontStruct *font = FACE_FONT (face);
	COLORREF fg;
	COLORREF bg;

	/* 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]);
	    font = FACE_FONT (face);
	    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);
	    font = FACE_FONT (face);
	    if (FACE_STIPPLE (face))
	      stippled = 1;
	  }

	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;

	    if ((!face->font
		 || face->font == (XFontStruct *) FACE_DEFAULT
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		 || face->font == f->output_data.w32->font)
		&& face->background == f->output_data.w32->background_pixel
		&& face->foreground == f->output_data.w32->foreground_pixel)
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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;
		  }
	      }
	  }

	if (font == (XFontStruct *) FACE_DEFAULT)
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	  font = f->output_data.w32->font;
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	SetBkMode (hdc, just_foreground ? TRANSPARENT : OPAQUE);

	SetTextColor (hdc, fg);
	SetBkColor (hdc, bg);

	SelectObject (hdc, font->hfont);
		
	TextOut (hdc, left, top, buf, len);

	if (!just_foreground)
	  {
	    /* Clear the rest of the line's height.  */
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	    if (f->output_data.w32->line_height != FONT_HEIGHT (font))
		w32_fill_area (f, hdc, bg,
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				 left,
				 top + FONT_HEIGHT (font),
				 FONT_WIDTH (font) * len,
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				 f->output_data.w32->line_height - FONT_HEIGHT (font));
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	  }

	{
	  int underline_position = 1;

	  if (font->tm.tmDescent <= underline_position)
	      underline_position = font->tm.tmDescent - 1;

	  if (face->underline)
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	      w32_fill_area (f, hdc, fg,
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			       left, (top
				      + FONT_BASE (font)
				      + underline_position),
			       len * FONT_WIDTH (font), 1);
	}

	left += len * FONT_WIDTH (font);
      }
    }

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  release_frame_dc (f, hdc);
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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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      FlashWindow (FRAME_W32_WINDOW (selected_frame), TRUE);
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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
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	 the correct value of w32_focus_frame.  */
      dpyinfo->w32_focus_frame = frame;
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      if (old_focus && old_focus->auto_lower)
	x_lower_frame (old_focus);

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      if (dpyinfo->w32_focus_frame && dpyinfo->w32_focus_frame->auto_raise)
	pending_autoraise_frame = dpyinfo->w32_focus_frame;
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      else
	pending_autoraise_frame = 0;
    }

  x_frame_rehighlight (dpyinfo);
}

/* Handle an event saying the mouse has moved out of an Emacs frame.  */

void
x_mouse_leave (dpyinfo)
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     struct w32_display_info *dpyinfo;
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{
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  x_new_focus_frame (dpyinfo, dpyinfo->w32_focus_event_frame);
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}

/* The focus has changed, or we have redirected a frame's focus to
   another frame (this happens when a frame uses a surrogate
   minibuffer frame).  Shift the highlight as appropriate.

   The FRAME argument doesn't necessarily have anything to do with which
   frame is being highlighted or unhighlighted; we only use it to find
   the appropriate display info.  */
static void
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w32_frame_rehighlight (frame)
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     struct frame *frame;
{
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  x_frame_rehighlight (FRAME_W32_DISPLAY_INFO (frame));
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}

static void
x_frame_rehighlight (dpyinfo)
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     struct w32_display_info *dpyinfo;
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{
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  struct frame *old_highlight = dpyinfo->w32_highlight_frame;
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  if (dpyinfo->w32_focus_frame)
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    {
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      dpyinfo->w32_highlight_frame
	= ((GC_FRAMEP (FRAME_FOCUS_FRAME (dpyinfo->w32_focus_frame)))
	   ? XFRAME (FRAME_FOCUS_FRAME (dpyinfo->w32_focus_frame))
	   : dpyinfo->w32_focus_frame);
      if (! FRAME_LIVE_P (dpyinfo->w32_highlight_frame))
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	{
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	  FRAME_FOCUS_FRAME (dpyinfo->w32_focus_frame) = Qnil;
	  dpyinfo->w32_highlight_frame = dpyinfo->w32_focus_frame;
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	}
    }
  else
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    dpyinfo->w32_highlight_frame = 0;
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  if (dpyinfo->w32_highlight_frame != old_highlight)
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    {
      if (old_highlight)
	frame_unhighlight (old_highlight);
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      if (dpyinfo->w32_highlight_frame)
	frame_highlight (dpyinfo->w32_highlight_frame);
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    }
}

/* Keyboard processing - modifier keys, etc. */

/* Convert a keysym to its name.  */

char *
x_get_keysym_name (keysym)
    int keysym;
{
  /* Make static so we can always return it */
  static char value[100];

  BLOCK_INPUT;
  GetKeyNameText(keysym, value, 100);
  UNBLOCK_INPUT;

  return value;
}

/* Mouse clicks and mouse movement.  Rah.  */

/* Given a pixel position (PIX_X, PIX_Y) on the frame F, return
   glyph co-ordinates in (*X, *Y).  Set *BOUNDS to the rectangle
   that the glyph at X, Y occupies, if BOUNDS != 0.
   If NOCLIP is nonzero, do not force the value into range.  */

void
pixel_to_glyph_coords (f, pix_x, pix_y, x, y, bounds, noclip)
     FRAME_PTR f;
     register int pix_x, pix_y;
     register int *x, *y;
     RECT *bounds;
     int noclip;
{
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  /* Support tty mode: if Vwindow_system is nil, behave correctly. */
  if (NILP (Vwindow_system))
    {
      *x = pix_x;
      *y = pix_y;
      return;
    }

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  /* Arrange for the division in PIXEL_TO_CHAR_COL etc. to round down
     even for negative values.  */
  if (pix_x < 0)
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    pix_x -= FONT_WIDTH ((f)->output_data.w32->font) - 1;
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  if (pix_y < 0)
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    pix_y -= (f)->output_data.w32->line_height - 1;
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  pix_x = PIXEL_TO_CHAR_COL (f, pix_x);
  pix_y = PIXEL_TO_CHAR_ROW (f, pix_y);

  if (bounds)
    {
      bounds->left = CHAR_TO_PIXEL_COL (f, pix_x);
      bounds->top = CHAR_TO_PIXEL_ROW (f, pix_y);
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      bounds->right  = bounds->left + FONT_WIDTH  (f->output_data.w32->font) - 1;
      bounds->bottom = bounds->top + f->output_data.w32->line_height - 1;
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    }

  if (!noclip)
    {
      if (pix_x < 0)
	pix_x = 0;
      else if (pix_x > f->width)
	pix_x = f->width;

      if (pix_y < 0)
	pix_y = 0;
      else if (pix_y > f->height)
	pix_y = f->height;
    }

  *x = pix_x;
  *y = pix_y;
}

void
glyph_to_pixel_coords (f, x, y, pix_x, pix_y)
     FRAME_PTR f;
     register int x, y;
     register int *pix_x, *pix_y;
{
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  /* Support tty mode: if Vwindow_system is nil, behave correctly. */
  if (NILP (Vwindow_system))
    {
      *pix_x = x;
      *pix_y = y;
      return;
    }

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  *pix_x = CHAR_TO_PIXEL_COL (f, x);
  *pix_y = CHAR_TO_PIXEL_ROW (f, y);
}

BOOL 
parse_button (message, pbutton, pup)
     int message;
     int * pbutton;
     int * pup;
{
  int button = 0;
  int up = 0;
  
  switch (message)
    {
    case WM_LBUTTONDOWN:
      button = 0;
      up = 0;
      break;
    case WM_LBUTTONUP:
      button = 0;
      up = 1;
      break;
    case WM_MBUTTONDOWN:
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      if (NILP (Vw32_swap_mouse_buttons))
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	button = 1;
      else
	button = 2;
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      up = 0;
      break;
    case WM_MBUTTONUP:
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      if (NILP (Vw32_swap_mouse_buttons))
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	button = 1;
      else
	button = 2;
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      up = 1;
      break;
    case WM_RBUTTONDOWN:
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      if (NILP (Vw32_swap_mouse_buttons))
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	button = 2;
      else
	button = 1;
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      up = 0;
      break;
    case WM_RBUTTONUP:
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      if (NILP (Vw32_swap_mouse_buttons))
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	button = 2;
      else
	button = 1;
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      up = 1;
      break;
    default:
      return (FALSE);
    }
  
  if (pup) *pup = up;
  if (pbutton) *pbutton = button;
  
  return (TRUE);
}


/* Prepare a mouse-event in *RESULT for placement in the input queue.

   If the event is a button press, then note that we have grabbed
   the mouse.  */

static void
construct_mouse_click (result, msg, f)
     struct input_event *result;
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     W32Msg *msg;
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     struct frame *f;
{
  int button;
  int up;

  parse_button (msg->msg.message, &button, &up);

  /* Make the event type no_event; we'll change that when we decide
     otherwise.  */
  result->kind = mouse_click;
  result->code = button;
  result->timestamp = msg->msg.time;
  result->modifiers = (msg->dwModifiers
		       | (up
			  ? up_modifier
			  : down_modifier));

  {
    int row, column;

    XSETINT (result->x, LOWORD (msg->msg.lParam));
    XSETINT (result->y, HIWORD (msg->msg.lParam));
    XSETFRAME (result->frame_or_window, f);
  }
}

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static void
construct_mouse_wheel (result, msg, f)
     struct input_event *result;
     W32Msg *msg;
     struct frame *f;
{
  POINT p;
  result->kind = mouse_wheel;
  result->code = (short) HIWORD (msg->msg.wParam);
  result->timestamp = msg->msg.time;
  result->modifiers = msg->dwModifiers;
  p.x = LOWORD (msg->msg.lParam);
  p.y = HIWORD (msg->msg.lParam);
  ScreenToClient(msg->msg.hwnd, &p);
  XSETINT (result->x, p.x);
  XSETINT (result->y, p.y);
  XSETFRAME (result->frame_or_window, f);
}

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/* Function to report a mouse movement to the mainstream Emacs code.
   The input handler calls this.

   We have received a mouse movement event, which is given in *event.
   If the mouse is over a different glyph than it was last time, tell
   the mainstream emacs code by setting mouse_moved.  If not, ask for
   another motion event, so we can check again the next time it moves.  */

static void
note_mouse_movement (frame, msg)
     FRAME_PTR frame;
     MSG *msg;
{
  last_mouse_movement_time = msg->time;

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  if (msg->hwnd != FRAME_W32_WINDOW (frame))
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    {
      frame->mouse_moved = 1;
      last_mouse_scroll_bar = Qnil;

      note_mouse_highlight (frame, -1, -1);
    }

  /* Has the mouse moved off the glyph it was on at the last sighting?  */
  else if (LOWORD (msg->lParam) < last_mouse_glyph.left
	   || LOWORD (msg->lParam) > last_mouse_glyph.right
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	   || HIWORD (msg->lParam) < last_mouse_glyph.top
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	   || HIWORD (msg->lParam) > last_mouse_glyph.bottom)
    {
      frame->mouse_moved = 1;
      last_mouse_scroll_bar = Qnil;

      note_mouse_highlight (frame, LOWORD (msg->lParam), HIWORD (msg->lParam));
    }
}

/* This is used for debugging, to turn off note_mouse_highlight.  */
static int disable_mouse_highlight;

/* Take proper action when the mouse has moved to position X, Y on frame F
   as regards highlighting characters that have mouse-face properties.
   Also dehighlighting chars where the mouse was before.
   X and Y can be negative or out of range.  */

static void
note_mouse_highlight (f, x, y)
     FRAME_PTR f;
     int x, y;
{
  int row, column, portion;
  RECT new_glyph;
  Lisp_Object window;
  struct window *w;

  if (disable_mouse_highlight)
    return;

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  FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_x = x;
  FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_y = y;
  FRAME_W32_DISPLAY_INFO (f)->mouse_face_mouse_frame = f;
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  if (FRAME_W32_DISPLAY_INFO (f)->mouse_face_defer)
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    return;

  if (gc_in_progress)
    {