(load_face_colors): Load background color if setting

[gnu-emacs] / src / xterm.c

/* X Communication module for terminals which understand the X protocol.
   Copyright (C) 1989, 93, 94, 95, 96, 1997, 1998, 1999
   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
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.  */

/* New display code by Gerd Moellmann <gerd@gnu.org>.  */
/* Xt features made by Fred Pierresteguy.  */

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

#include <config.h>

#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif

#ifdef HAVE_X_WINDOWS

#include "lisp.h"
#include "blockinput.h"

/* Need syssignal.h for various externs and definitions that may be required
   by some configurations for calls to signal later in this source file.  */
#include "syssignal.h"

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
#include <X11/cursorfont.h>

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

#ifdef BSD_SYSTEM
#include <sys/ioctl.h>
#endif /* ! defined (BSD_SYSTEM) */

#include "systty.h"
#include "systime.h"

#ifndef INCLUDED_FCNTL
#include <fcntl.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
/* Caused redefinition of DBL_DIG on Netbsd; seems not to be needed.  */
/* #include <sys/param.h>  */

#include "charset.h"
#include "ccl.h"
#include "frame.h"
#include "fontset.h"
#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
#endif /* ! 0 */
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
#include "window.h"
#include "keyboard.h"
#include "intervals.h"
#include "process.h"

#ifdef USE_X_TOOLKIT
#include <X11/Shell.h>
#endif

#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef USE_X_TOOLKIT

extern void free_frame_menubar ();
extern FRAME_PTR x_menubar_window_to_frame ();

#if (XtSpecificationRelease >= 5) && !defined(NO_EDITRES)
#define HACK_EDITRES
extern void _XEditResCheckMessages ();
#endif /* not NO_EDITRES */

/* Include toolkit specific headers for the scroll bar widget.  */

#ifdef USE_TOOLKIT_SCROLL_BARS
#if defined USE_MOTIF
#include <Xm/Xm.h>              /* for LESSTIF_VERSION */
#include <Xm/ScrollBar.h>
#include <Xm/ScrollBarP.h>
#elif defined HAVE_XAW3D
#include <X11/Xaw3d/Simple.h>
#include <X11/Xaw3d/ThreeD.h>
#include <X11/Xaw3d/Scrollbar.h>
#define ARROW_SCROLLBAR
#include <X11/Xaw3d/ScrollbarP.h>
#endif /* HAVE_XAW3D */
#endif /* USE_TOOLKIT_SCROLL_BARS */

#endif /* USE_X_TOOLKIT */

#ifndef USE_X_TOOLKIT
#define x_any_window_to_frame x_window_to_frame
#define x_top_window_to_frame x_window_to_frame
#endif

#ifdef USE_X_TOOLKIT
#include "widget.h"
#ifndef XtNinitialState
#define XtNinitialState "initialState"
#endif
#endif

#ifdef HAVE_SETLOCALE
/* So we can do setlocale.  */
#include <locale.h>
#endif

#ifdef SOLARIS2
/* memmove will be defined as a macro in Xfuncs.h unless
   <string.h> is included beforehand.  The declaration for memmove in
   <string.h> will cause a syntax error when Xfuncs.h later includes it.  */
#include <string.h>
#endif

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

#define abs(x)  ((x) < 0 ? -(x) : (x))

#define BETWEEN(X, LOWER, UPPER)  ((X) >= (LOWER) && (X) < (UPPER))

\f
/* Bitmaps for truncated lines.  */

enum bitmap_type
{
  NO_BITMAP,
  LEFT_TRUNCATION_BITMAP,
  RIGHT_TRUNCATION_BITMAP,
  OVERLAY_ARROW_BITMAP,
  CONTINUED_LINE_BITMAP,
  CONTINUATION_LINE_BITMAP,
  ZV_LINE_BITMAP
};

/* Bitmap drawn to indicate lines not displaying text if
   `indicate-empty-lines' is non-nil.  */

#define zv_width 8
#define zv_height 8
static unsigned char zv_bits[] = {
   0x00, 0x00, 0x1e, 0x1e, 0x1e, 0x1e, 0x00, 0x00};

/* An arrow like this: `<-'.  */

#define left_width 8
#define left_height 8
static unsigned char left_bits[] = {
   0x18, 0x0c, 0x06, 0x3f, 0x3f, 0x06, 0x0c, 0x18};

/* Marker for continued lines.  */

#define continued_width 8
#define continued_height 8
static unsigned char continued_bits[] = {
   0x30, 0x30, 0x30, 0x30, 0xb4, 0xfc, 0x78, 0x30};

#define continuation_width 8
#define continuation_height 8
static unsigned char continuation_bits[] = {
   0x0c, 0x1e, 0x3f, 0x2d, 0x0c, 0x0c, 0x0c, 0x0c};

/* Right truncation arrow bitmap `->'.  */

#define right_width 8
#define right_height 8
static unsigned char right_bits[] = {
   0x18, 0x30, 0x60, 0xfc, 0xfc, 0x60, 0x30, 0x18};

/* Overlay arrow bitmap; a filled `<>'.  */

#if 1
#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0x30, 0x08, 0x3c, 0x7e, 0x7a, 0x7a, 0x62, 0x3c};

#elif 0
#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0x18, 0x04, 0x08, 0x1c, 0x3e, 0x3a, 0x32, 0x1c};
#else
#define ov_width 8
#define ov_height 8
static unsigned char ov_bits[] = {
   0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x3c, 0x18};
#endif

extern Lisp_Object Qhelp_echo;

\f
/* Non-zero means Emacs uses toolkit scroll bars.  */

int x_toolkit_scroll_bars_p;

/* If a string, XTread_socket generates an event to display that string.
   (The display is done in read_char.)  */
   
static Lisp_Object help_echo;

/* Temporary variable for XTread_socket.  */

static Lisp_Object previous_help_echo;

/* Non-zero means that a HELP_EVENT has been generated since Emacs
   start.  */

static int any_help_event_p;

/* Non-zero means draw block and hollow cursor as wide as the glyph
   under it.  For example, if a block cursor is over a tab, it will be
   drawn as wide as that tab on the display.  */

int x_stretch_cursor_p;

/* This is a chain of structures for all the X displays currently in
   use.  */

struct x_display_info *x_display_list;

/* This is a list of cons cells, each of the form (NAME
   . FONT-LIST-CACHE), one for each element of x_display_list and in
   the same order.  NAME is the name of the frame.  FONT-LIST-CACHE
   records previous values returned by x-list-fonts.  */

Lisp_Object x_display_name_list;

/* Frame being updated by update_frame.  This is declared in term.c.
   This is set by update_begin and looked at by all the XT functions.
   It is zero while not inside an update.  In that case, the XT
   functions assume that `selected_frame' is the frame to apply to.  */

extern struct frame *updating_frame;

extern int waiting_for_input;

/* This is a frame waiting to be auto-raised, within XTread_socket.  */

struct frame *pending_autoraise_frame;

#ifdef USE_X_TOOLKIT
/* The application context for Xt use.  */
XtAppContext Xt_app_con;
static String Xt_default_resources[] = {0};
#endif /* USE_X_TOOLKIT */

/* Nominal cursor position -- where to draw output.  
   HPOS and VPOS are window relative glyph matrix coordinates.
   X and Y are window relative pixel coordinates.  */

struct cursor_pos output_cursor;


/* Mouse movement.

   Formerly, we used PointerMotionHintMask (in standard_event_mask)
   so that we would have to call XQueryPointer after each MotionNotify
   event to ask for another such event.  However, this made mouse tracking
   slow, and there was a bug that made it eventually stop.

   Simply asking for MotionNotify all the time seems to work better.

   In order to avoid asking for motion events and then throwing most
   of them away or busy-polling the server for mouse positions, we ask
   the server for pointer motion hints.  This means that we get only
   one event per group of mouse movements.  "Groups" are delimited by
   other kinds of events (focus changes and button clicks, for
   example), or by XQueryPointer calls; when one of these happens, we
   get another MotionNotify event the next time the mouse moves.  This
   is at least as efficient as getting motion events when mouse
   tracking is on, and I suspect only negligibly worse when tracking
   is off.  */

/* Where the mouse was last time we reported a mouse event.  */

FRAME_PTR last_mouse_frame;
static XRectangle last_mouse_glyph;
static Lisp_Object last_mouse_press_frame;

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

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

   If the last X motion event didn't occur in a scroll bar, we set
   this to Qnil, to tell XTmouse_position to return an ordinary motion
   event.  */

static Lisp_Object last_mouse_scroll_bar;

/* This is a hack.  We would really prefer that XTmouse_position would
   return the time associated with the position it returns, but there
   doesn't seem to be any way to wrest the time-stamp 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.  */

static Time last_mouse_movement_time;

/* Incremented by XTread_socket whenever it really tries to read
   events.  */

#ifdef __STDC__
static int volatile input_signal_count;
#else
static int input_signal_count;
#endif

/* Used locally within XTread_socket.  */

static int x_noop_count;

/* Initial values of argv and argc.  */

extern char **initial_argv;
extern int initial_argc;

extern Lisp_Object Vcommand_line_args, Vsystem_name;

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

extern Lisp_Object Vx_no_window_manager;

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;

extern XrmDatabase x_load_resources ();
extern Lisp_Object x_icon_type ();


/* Enumeration for overriding/changing the face to use for drawing
   glyphs in x_draw_glyphs.  */

enum draw_glyphs_face
{
  DRAW_NORMAL_TEXT,
  DRAW_INVERSE_VIDEO,
  DRAW_CURSOR,
  DRAW_MOUSE_FACE,
  DRAW_IMAGE_RAISED,
  DRAW_IMAGE_SUNKEN
};

static void x_update_window_end P_ ((struct window *, int));
static void frame_to_window_pixel_xy P_ ((struct window *, int *, int *));
void x_delete_display P_ ((struct x_display_info *));
static unsigned int x_x_to_emacs_modifiers P_ ((struct x_display_info *,
                                                unsigned));
static int fast_find_position P_ ((struct window *, int, int *, int *,
                                   int *, int *));
static void set_output_cursor P_ ((struct cursor_pos *));
static struct glyph *x_y_to_hpos_vpos P_ ((struct window *, int, int,
                                           int *, int *, int *));
static void note_mode_line_highlight P_ ((struct window *, int, int));
static void x_check_font P_ ((struct frame *, XFontStruct *));
static void note_mouse_highlight P_ ((struct frame *, int, int));
static void note_toolbar_highlight P_ ((struct frame *f, int, int));
static void x_handle_toolbar_click P_ ((struct frame *, XButtonEvent *));
static void show_mouse_face P_ ((struct x_display_info *,
                                 enum draw_glyphs_face));
static int x_io_error_quitter P_ ((Display *));
int x_catch_errors P_ ((Display *));
void x_uncatch_errors P_ ((Display *, int));
void x_lower_frame P_ ((struct frame *));
void x_scroll_bar_clear P_ ((struct frame *));
int x_had_errors_p P_ ((Display *));
void x_wm_set_size_hint P_ ((struct frame *, long, int));
void x_raise_frame P_ ((struct frame *));
void x_set_window_size P_ ((struct frame *, int, int, int));
void x_wm_set_window_state P_ ((struct frame *, int));
void x_wm_set_icon_pixmap P_ ((struct frame *, int));
void x_initialize P_ ((void));
static void x_font_min_bounds P_ ((XFontStruct *, int *, int *));
static int x_compute_min_glyph_bounds P_ ((struct frame *));
static void x_draw_phys_cursor_glyph P_ ((struct window *,
                                          struct glyph_row *,
                                          enum draw_glyphs_face));
static void x_update_end P_ ((struct frame *));
static void XTframe_up_to_date P_ ((struct frame *));
static void XTreassert_line_highlight P_ ((int, int));
static void x_change_line_highlight P_ ((int, int, int, int));
static void XTset_terminal_modes P_ ((void));
static void XTreset_terminal_modes P_ ((void));
static void XTcursor_to P_ ((int, int, int, int));
static void x_write_glyphs P_ ((struct glyph *, int));
static void x_clear_end_of_line P_ ((int));
static void x_clear_frame P_ ((void));
static void x_clear_cursor P_ ((struct window *));
static void frame_highlight P_ ((struct frame *));
static void frame_unhighlight P_ ((struct frame *));
static void x_new_focus_frame P_ ((struct x_display_info *, struct frame *));
static void XTframe_rehighlight P_ ((struct frame *));
static void x_frame_rehighlight P_ ((struct x_display_info *));
static void x_draw_hollow_cursor P_ ((struct window *, struct glyph_row *));
static void x_draw_bar_cursor P_ ((struct window *, struct glyph_row *));
static int x_intersect_rectangles P_ ((XRectangle *, XRectangle *,
                                       XRectangle *));
static void expose_frame P_ ((struct frame *, int, int, int, int));
static void expose_window_tree P_ ((struct window *, XRectangle *));
static void expose_window P_ ((struct window *, XRectangle *));
static void expose_area P_ ((struct window *, struct glyph_row *,
                             XRectangle *, enum glyph_row_area));
static void expose_line P_ ((struct window *, struct glyph_row *,
                             XRectangle *));
static void x_update_cursor_in_window_tree P_ ((struct window *, int));
static void x_update_window_cursor P_ ((struct window *, int));
static void x_erase_phys_cursor P_ ((struct window *));
void x_display_and_set_cursor P_ ((struct window *, int, int, int, int, int));
static void x_draw_bitmap P_ ((struct window *, struct glyph_row *, 
                               enum bitmap_type));

static void x_clip_to_row P_ ((struct window *, struct glyph_row *,
                               GC, int));
static int x_phys_cursor_in_rect_p P_ ((struct window *, XRectangle *));
static void x_draw_row_bitmaps P_ ((struct window *, struct glyph_row *));
static void note_overwritten_text_cursor P_ ((struct window *, int, int));
static void x_flush P_ ((struct frame *f));
     

/* Flush display of frame F, or of all frames if F is null.  */

static void
x_flush (f)
     struct frame *f;
{
  BLOCK_INPUT;
  if (f == NULL)
    {
      Lisp_Object rest, frame;
      FOR_EACH_FRAME (rest, frame)
        x_flush (XFRAME (frame));
    }
  else if (FRAME_X_P (f))
    XFlush (FRAME_X_DISPLAY (f));
  UNBLOCK_INPUT;
}


/* Remove calls to XFlush by defining XFlush to an empty replacement.
   Calls to XFlush should be unnecessary because the X output buffer
   is flushed automatically as needed by calls to XPending,
   XNextEvent, or XWindowEvent according to the XFlush man page.
   XTread_socket calls XPending.  Removing XFlush improves
   performance.  */

#define XFlush(DISPLAY) (void) 0 

\f
/***********************************************************************
                              Debugging
 ***********************************************************************/

#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 */


\f
/* Return the struct x_display_info corresponding to DPY.  */

struct x_display_info *
x_display_info_for_display (dpy)
     Display *dpy;
{
  struct x_display_info *dpyinfo;

  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    if (dpyinfo->display == dpy)
      return dpyinfo;

  return 0;
}


\f
/***********************************************************************
                    Starting and ending an update
 ***********************************************************************/
                                                                        
/* Start an update of frame F.  This function is installed as a hook
   for update_begin, i.e. it is called when update_begin is called.
   This function is called prior to calls to x_update_window_begin for
   each window being updated.  Currently, there is nothing to do here
   because all interesting stuff is done on a window basis.  */

static void
x_update_begin (f)
     struct frame *f;
{
  /* Nothing to do.  */
}


/* Start update of window W.  Set the global variable updated_window
   to the window being updated and set output_cursor to the cursor
   position of W.  */

static void
x_update_window_begin (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  struct x_display_info *display_info = FRAME_X_DISPLAY_INFO (f);
  
  updated_window = w;
  set_output_cursor (&w->cursor);

  BLOCK_INPUT;

  if (f == display_info->mouse_face_mouse_frame)
    {
      /* Don't do highlighting for mouse motion during the update.  */
      display_info->mouse_face_defer = 1;

      /* If F needs to be redrawn, simply forget about any prior mouse
         highlighting.  */
      if (FRAME_GARBAGED_P (f))
        display_info->mouse_face_window = Qnil;

      /* 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's current matrix that we would use
         is all wrong, and we will redisplay that line anyway.  */
      if (!NILP (display_info->mouse_face_window)
          && w == XWINDOW (display_info->mouse_face_window))
        {
          int i;

          for (i = 0; i < w->desired_matrix->nrows; ++i)
            if (MATRIX_ROW_ENABLED_P (w->desired_matrix, i))
              break;

          if (i < w->desired_matrix->nrows)
            clear_mouse_face (display_info);
        }
    }

  UNBLOCK_INPUT;
}


/* Draw a vertical window border to the right of window W if W doesn't
   have vertical scroll bars.  */

static void
x_draw_vertical_border (w)
     struct window *w;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  
  /* Redraw borders between horizontally adjacent windows.  Don't
     do it for frames with vertical scroll bars because either the
     right scroll bar of a window, or the left scroll bar of its
     neighbor will suffice as a border.  */
  if (!WINDOW_RIGHTMOST_P (w)
      && !FRAME_HAS_VERTICAL_SCROLL_BARS (f))
    {
      int x0, x1, y0, y1;

      window_box_edges (w, -1, &x0, &y0, &x1, &y1);
      x1 += FRAME_X_FLAGS_AREA_WIDTH (f);
      y1 -= 1;
      
      XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), 
                 f->output_data.x->normal_gc, x1, y0, x1, y1);
    }
}
   
   
/* End update of window W (which is equal to updated_window).  Draw
   vertical borders between horizontally adjacent windows, and display
   W's cursor if CURSOR_ON_P is non-zero.  W may be a menu bar
   pseudo-window in case we don't have X toolkit support.  Such
   windows don't have a cursor, so don't display it here.  */

static void
x_update_window_end (w, cursor_on_p)
     struct window *w;
     int cursor_on_p;
{
  if (!w->pseudo_window_p)
    {
      BLOCK_INPUT;
      if (cursor_on_p)
        x_display_and_set_cursor (w, 1, output_cursor.hpos,
                                  output_cursor.vpos,
                                  output_cursor.x, output_cursor.y);
      x_draw_vertical_border (w);
      UNBLOCK_INPUT;
    }
  
  updated_window = NULL;
}


/* End update of frame F.  This function is installed as a hook in
   update_end.  */

static void
x_update_end (f)
     struct frame *f;
{
  /* Mouse highlight may be displayed again.  */
  FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 0;

  BLOCK_INPUT;
  XFlush (FRAME_X_DISPLAY (f));
  UNBLOCK_INPUT;
}


/* This function is called from various places in xdisp.c whenever a
   complete update has been performed.  The global variable
   updated_window is not available here.  */

static void
XTframe_up_to_date (f)
     struct frame *f;
{
  if (FRAME_X_P (f))
    {
      struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
      if (dpyinfo->mouse_face_deferred_gc
          || f == dpyinfo->mouse_face_mouse_frame)
        {
          BLOCK_INPUT;
          if (dpyinfo->mouse_face_mouse_frame)
            note_mouse_highlight (dpyinfo->mouse_face_mouse_frame,
                                  dpyinfo->mouse_face_mouse_x,
                                  dpyinfo->mouse_face_mouse_y);
          dpyinfo->mouse_face_deferred_gc = 0;
          UNBLOCK_INPUT;
        }
    }
}


/* Draw truncation mark bitmaps, continuation mark bitmaps, overlay
   arrow bitmaps, or clear the areas where they would be displayed
   before DESIRED_ROW is made current.  The window being updated is
   found in updated_window.  This function It is called from
   update_window_line only if it is known that there are differences
   between bitmaps to be drawn between current row and DESIRED_ROW.  */

static void
x_after_update_window_line (desired_row)
     struct glyph_row *desired_row;
{
  struct window *w = updated_window;
  
  xassert (w);
  
  if (!desired_row->mode_line_p && !w->pseudo_window_p)
    {
      BLOCK_INPUT;
      x_draw_row_bitmaps (w, desired_row);

      /* When a window has disappeared, make sure that no rest of
         full-width rows stays visible in the internal border.  */
      if (windows_or_buffers_changed)
        {
          struct frame *f = XFRAME (w->frame);
          int width = FRAME_INTERNAL_BORDER_WIDTH (f);
          int height = desired_row->visible_height;
          int x = window_box_right (w, -1) + FRAME_X_FLAGS_AREA_WIDTH (f);
          int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));

          XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      x, y, width, height, False);
        }
      
      UNBLOCK_INPUT;
    }
}


/* Draw the bitmap WHICH in one of the areas to the left or right of
   window W.  ROW is the glyph row for which to display the bitmap; it
   determines the vertical position at which the bitmap has to be
   drawn.  */

static void
x_draw_bitmap (w, row, which)
     struct window *w;
     struct glyph_row *row;
     enum bitmap_type which;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  Display *display = FRAME_X_DISPLAY (f);
  Window window = FRAME_X_WINDOW (f);
  int x, y, wd, h, dy;
  unsigned char *bits;
  Pixmap pixmap;
  GC gc = f->output_data.x->normal_gc;
  struct face *face;
  int depth = DefaultDepthOfScreen (FRAME_X_SCREEN (f));

  /* Must clip because of partially visible lines.  */
  x_clip_to_row (w, row, gc, 1);

  switch (which)
    {
    case LEFT_TRUNCATION_BITMAP:
      wd = left_width;
      h = left_height;
      bits = left_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
           - wd
           - (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;
      
    case OVERLAY_ARROW_BITMAP:
      wd = left_width;
      h = left_height;
      bits = ov_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
           - wd
           - (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;
      
    case RIGHT_TRUNCATION_BITMAP:
      wd = right_width;
      h = right_height;
      bits = right_bits;
      x = window_box_right (w, -1);
      x += (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2;
      break;

    case CONTINUED_LINE_BITMAP:
      wd = right_width;
      h = right_height;
      bits = continued_bits;
      x = window_box_right (w, -1);
      x += (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2;
      break;
      
    case CONTINUATION_LINE_BITMAP:
      wd = continuation_width;
      h = continuation_height;
      bits = continuation_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
           - wd
           - (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;

    case ZV_LINE_BITMAP:
      wd = zv_width;
      h = zv_height;
      bits = zv_bits;
      x = (WINDOW_TO_FRAME_PIXEL_X (w, 0)
           - wd
           - (FRAME_X_FLAGS_AREA_WIDTH (f) - wd) / 2);
      break;

    default:
      abort ();
    }

  /* Convert to frame coordinates.  Set dy to the offset in the row to
     start drawing the bitmap.  */
  y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);
  dy = (row->height - h) / 2;

  /* Draw the bitmap.  I believe these small pixmaps can be cached
     by the server.  */
  face = FACE_FROM_ID (f, BITMAP_AREA_FACE_ID);
  pixmap = XCreatePixmapFromBitmapData (display, window, bits, wd, h,
                                        face->foreground,
                                        face->background, depth);
  XCopyArea (display, pixmap, window, gc, 0, 0, wd, h, x, y + dy);
  XFreePixmap (display, pixmap);
  XSetClipMask (display, gc, None);
}


/* Draw flags bitmaps for glyph row ROW on window W.  Call this
   function with input blocked.  */

static void
x_draw_row_bitmaps (w, row)
     struct window *w;
     struct glyph_row *row;
{
  struct frame *f = XFRAME (w->frame);
  enum bitmap_type bitmap;
  struct face *face;
  int top_line_height = -1;

  xassert (interrupt_input_blocked);

  /* If row is completely invisible, because of vscrolling, we
     don't have to draw anything.  */
  if (row->visible_height <= 0)
    return;

  face = FACE_FROM_ID (f, BITMAP_AREA_FACE_ID);
  PREPARE_FACE_FOR_DISPLAY (f, face);

  /* Decide which bitmap to draw at the left side.  */
  if (row->overlay_arrow_p)
    bitmap = OVERLAY_ARROW_BITMAP;
  else if (row->truncated_on_left_p)
    bitmap = LEFT_TRUNCATION_BITMAP;
  else if (MATRIX_ROW_CONTINUATION_LINE_P (row))
    bitmap = CONTINUATION_LINE_BITMAP;
  else if (row->indicate_empty_line_p)
    bitmap = ZV_LINE_BITMAP;
  else
    bitmap = NO_BITMAP;

  /* Clear flags area if no bitmap to draw or if bitmap doesn't fill
     the flags area.  */
  if (bitmap == NO_BITMAP
      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_FLAGS_AREA_WIDTH (f)
      || row->height > FRAME_FLAGS_BITMAP_HEIGHT (f))
    {
      /* If W has a vertical border to its left, don't draw over it.  */
      int border = ((XFASTINT (w->left) > 0
                     && !FRAME_HAS_VERTICAL_SCROLL_BARS (f))
                    ? 1 : 0);
      int left = window_box_left (w, -1);

      if (top_line_height < 0)
        top_line_height = WINDOW_DISPLAY_TOP_LINE_HEIGHT (w);
      XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->background);
      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      face->gc,
                      (left
                       - FRAME_X_FLAGS_AREA_WIDTH (f)
                       + border),
                      WINDOW_TO_FRAME_PIXEL_Y (w, max (top_line_height,
                                                       row->y)),
                      FRAME_X_FLAGS_AREA_WIDTH (f) - border,
                      row->visible_height);
      XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->foreground);
    }

  /* Draw the left bitmap.  */
  if (bitmap != NO_BITMAP)
    x_draw_bitmap (w, row, bitmap);

  /* Decide which bitmap to draw at the right side.  */
  if (row->truncated_on_right_p)
    bitmap = RIGHT_TRUNCATION_BITMAP;
  else if (row->continued_p)
    bitmap = CONTINUED_LINE_BITMAP;
  else
    bitmap = NO_BITMAP;

  /* Clear flags area if no bitmap to draw of if bitmap doesn't fill
     the flags area.  */
  if (bitmap == NO_BITMAP
      || FRAME_FLAGS_BITMAP_WIDTH (f) < FRAME_X_FLAGS_AREA_WIDTH (f)
      || row->height > FRAME_FLAGS_BITMAP_HEIGHT (f))
    {
      int right = window_box_right (w, -1);

      if (top_line_height < 0)
        top_line_height = WINDOW_DISPLAY_TOP_LINE_HEIGHT (w);
      XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->background);
      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      face->gc,
                      right,
                      WINDOW_TO_FRAME_PIXEL_Y (w, max (top_line_height,
                                                       row->y)),
                      FRAME_X_FLAGS_AREA_WIDTH (f),
                      row->visible_height);
      XSetForeground (FRAME_X_DISPLAY (f), face->gc, face->foreground);
    }

  /* Draw the right bitmap.  */
  if (bitmap != NO_BITMAP)
    x_draw_bitmap (w, row, bitmap);
}

\f
/***********************************************************************
                          Line Highlighting
 ***********************************************************************/

/* External interface to control of standout mode.  Not used for X
   frames.  Aborts when called.  */

static void
XTreassert_line_highlight (new, vpos)
     int new, vpos;
{
  abort ();
}


/* Call this when about to modify line at position VPOS and change
   whether it is highlighted.  Not used for X frames.  Aborts when
   called.  */

static void
x_change_line_highlight (new_highlight, vpos, y, first_unused_hpos)
     int new_highlight, vpos, y, first_unused_hpos;
{
  abort ();
}


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

static void
XTset_terminal_modes ()
{
}

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

static void
XTreset_terminal_modes ()
{
}


\f
/***********************************************************************
                            Output Cursor
 ***********************************************************************/

/* Set the global variable output_cursor to CURSOR.  All cursor
   positions are relative to updated_window.  */

static void
set_output_cursor (cursor)
    struct cursor_pos *cursor;
{
  output_cursor.hpos = cursor->hpos;
  output_cursor.vpos = cursor->vpos;
  output_cursor.x = cursor->x;
  output_cursor.y = cursor->y;
}


/* Set a nominal cursor position.

   HPOS and VPOS are column/row positions in a window glyph matrix.  X
   and Y are window text area relative pixel positions.
   
   If this is done during an update, updated_window will contain the
   window that is being updated and the position is the future output
   cursor position for that window.  If updated_window is null, use
   selected_window and display the cursor at the given position.  */

static void
XTcursor_to (vpos, hpos, y, x)
     int vpos, hpos, y, x;
{
  struct window *w;

  /* If updated_window is not set, work on selected_window.  */
  if (updated_window)
    w = updated_window;
  else
    w = XWINDOW (selected_window);

  /* Set the output cursor.  */
  output_cursor.hpos = hpos;
  output_cursor.vpos = vpos;
  output_cursor.x = x;
  output_cursor.y = y;

  /* If not called as part of an update, really display the cursor.
     This will also set the cursor position of W.  */
  if (updated_window == NULL)
    {
      BLOCK_INPUT;
      x_display_cursor (w, 1, hpos, vpos, x, y);
      XFlush (FRAME_X_DISPLAY (selected_frame));
      UNBLOCK_INPUT;
    }
}


\f
/***********************************************************************
                           Display Iterator
 ***********************************************************************/

/* Function prototypes of this page.  */

static struct face *x_get_glyph_face_and_encoding P_ ((struct frame *,
                                                       struct glyph *,
                                                       XChar2b *));
static struct face *x_get_char_face_and_encoding P_ ((struct frame *, int,
                                                      int, XChar2b *, int));
static XCharStruct *x_per_char_metric P_ ((XFontStruct *, XChar2b *));
static void x_encode_char P_ ((int, XChar2b *, struct font_info *));
static void x_append_glyph P_ ((struct it *));
static void x_append_stretch_glyph P_ ((struct it *it, Lisp_Object,
                                        int, int, double));
static void x_produce_glyphs P_ ((struct it *));
static void x_produce_special_glyphs P_ ((struct it *, enum display_element_type));
static void x_produce_image_glyph P_ ((struct it *it));
     

/* Return a pointer to per-char metric information in FONT of a
   character pointed by B which is a pointer to an XChar2b.  */

#define PER_CHAR_METRIC(font, b)                                           \
  ((font)->per_char                                                        \
   ? ((font)->per_char + (b)->byte2 - (font)->min_char_or_byte2            \
      + (((font)->min_byte1 || (font)->max_byte1)                          \
         ? (((b)->byte1 - (font)->min_byte1)                               \
            * ((font)->max_char_or_byte2 - (font)->min_char_or_byte2 + 1)) \
         : 0))                                                             \
   : &((font)->max_bounds))


/* Get metrics of character CHAR2B in FONT.  Value is always non-null.
   If CHAR2B is not contained in FONT, the font's default character
   metric is returned.  */

static INLINE XCharStruct *
x_per_char_metric (font, char2b)
     XFontStruct *font;
     XChar2b *char2b;
{
  /* The result metric information.  */
  XCharStruct *pcm = NULL;

  xassert (font && char2b);

  if (font->per_char != NULL)
    {
      if (font->min_byte1 == 0 && font->max_byte1 == 0)
        {
          /* min_char_or_byte2 specifies the linear character index
             corresponding to the first element of the per_char array,
             max_char_or_byte2 is the index of the last character.  A
             character with non-zero CHAR2B->byte1 is not in the font.
             A character with byte2 less than min_char_or_byte2 or
             greater max_char_or_byte2 is not in the font.  */
          if (char2b->byte1 == 0
              && char2b->byte2 >= font->min_char_or_byte2
              && char2b->byte2 <= font->max_char_or_byte2)
            pcm = font->per_char + char2b->byte2 - font->min_char_or_byte2;
        }
      else
        {
          /* If either min_byte1 or max_byte1 are nonzero, both
             min_char_or_byte2 and max_char_or_byte2 are less than
             256, and the 2-byte character index values corresponding
             to the per_char array element N (counting from 0) are:

             byte1 = N/D + min_byte1
             byte2 = N\D + min_char_or_byte2

             where:

             D = max_char_or_byte2 - min_char_or_byte2 + 1
             / = integer division
             \ = integer modulus  */
          if (char2b->byte1 >= font->min_byte1
              && char2b->byte1 <= font->max_byte1
              && char2b->byte2 >= font->min_char_or_byte2
              && char2b->byte2 <= font->max_char_or_byte2)
            {
              pcm = (font->per_char
                     + ((font->max_char_or_byte2 - font->min_char_or_byte2 + 1)
                        * (char2b->byte1 - font->min_byte1))
                     + (char2b->byte2 - font->min_char_or_byte2));
            }
        }
    }
  else
    {
      /* If the per_char pointer is null, all glyphs between the first
         and last character indexes inclusive have the same
         information, as given by both min_bounds and max_bounds.  */
      if (char2b->byte2 >= font->min_char_or_byte2
          && char2b->byte2 <= font->max_char_or_byte2)
        pcm = &font->max_bounds;
    }


  if (pcm == NULL || pcm->width == 0)
    {
      /* Character not contained in the font.  FONT->default_char
         gives the character that will be printed.  FONT->default_char
         is a 16-bit character code with byte1 in the most significant
         byte and byte2 in the least significant byte.  */
      XChar2b default_char;
      default_char.byte1 = (font->default_char >> BITS_PER_CHAR) & 0xff;
      default_char.byte2 = font->default_char & 0xff;

      /* Avoid an endless recursion if FONT->default_char itself
         hasn't per char metrics.  handa@etl.go.jp reports that some
         fonts have this problem.  */
      if (default_char.byte1 != char2b->byte1
          || default_char.byte2 != char2b->byte2)
        pcm = x_per_char_metric (font, &default_char);
      else
        pcm = &font->max_bounds;
    }
  
  return pcm;
}


/* Encode CHAR2B using encoding information from FONT_INFO.  CHAR2B is
   the two-byte form of C.  Encoding is returned in *CHAR2B.  */

static INLINE void
x_encode_char (c, char2b, font_info)
     int c;
     XChar2b *char2b;
     struct font_info *font_info;
{
  int charset = CHAR_CHARSET (c);
  XFontStruct *font = font_info->font;

  /* FONT_INFO may define a scheme by which to encode byte1 and byte2.
     This may be either a program in a special encoder language or a
     fixed encoding.  */
  if (font_info->font_encoder)
    {
      /* It's a program.  */
      struct ccl_program *ccl = font_info->font_encoder;

      if (CHARSET_DIMENSION (charset) == 1)
        {
          ccl->reg[0] = charset;
          ccl->reg[1] = char2b->byte2;
        }
      else
        {
          ccl->reg[0] = charset;
          ccl->reg[1] = char2b->byte1;
          ccl->reg[2] = char2b->byte2;
        }
      
      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
      
      /* We assume that MSBs are appropriately set/reset by CCL
         program.  */
      if (font->max_byte1 == 0) /* 1-byte font */
        char2b->byte2 = ccl->reg[1];
      else
        char2b->byte1 = ccl->reg[1], char2b->byte2 = ccl->reg[2];
    }
  else if (font_info->encoding[charset])
    {
      /* Fixed encoding scheme.  See fontset.h for the meaning of the
         encoding numbers.  */
      int enc = font_info->encoding[charset];
      
      if ((enc == 1 || enc == 2)
          && CHARSET_DIMENSION (charset) == 2)
        char2b->byte1 |= 0x80;
      
      if (enc == 1 || enc == 3)
        char2b->byte2 |= 0x80;
    }
}


/* Get face and two-byte form of character C in face FACE_ID on frame
   F.  The encoding of C is returned in *CHAR2B.  MULTIBYTE_P non-zero
   means we want to display multibyte text.  Value is a pointer to a
   realized face that is ready for display.  */

static INLINE struct face *
x_get_char_face_and_encoding (f, c, face_id, char2b, multibyte_p)
     struct frame *f;
     int c, face_id;
     XChar2b *char2b;
     int multibyte_p;
{
  struct face *face = FACE_FROM_ID (f, face_id);

  if (!multibyte_p)
    {
      /* Unibyte case.  We don't have to encode, but we have to make
         sure to use a face suitable for unibyte.  */
      char2b->byte1 = 0;
      char2b->byte2 = c;
      
      if (!FACE_SUITABLE_FOR_CHARSET_P (face, -1))
        {
          face_id = FACE_FOR_CHARSET (f, face_id, -1);
          face = FACE_FROM_ID (f, face_id);
        }
    }
  else if (c < 128 && face_id < BASIC_FACE_ID_SENTINEL)
    {
      /* Case of ASCII in a face known to fit ASCII.  */
      char2b->byte1 = 0;
      char2b->byte2 = c;
    }
  else
    {
      int c1, c2, charset;
      
      /* Split characters into bytes.  If c2 is -1 afterwards, C is
         really a one-byte character so that byte1 is zero.  */
      SPLIT_CHAR (c, charset, c1, c2);
      if (c2 > 0)
        char2b->byte1 = c1, char2b->byte2 = c2;
      else
        char2b->byte1 = 0, char2b->byte2 = c1;

      /* Get the face for displaying C.  If `face' is not suitable for
         charset, get the one that fits.  (This can happen for the
         translations of composite characters where the glyph
         specifies a face for ASCII, but translations have a different
         charset.)  */
      if (!FACE_SUITABLE_FOR_CHARSET_P (face, charset))
        {
          face_id = FACE_FOR_CHARSET (f, face_id, charset);
          face = FACE_FROM_ID (f, face_id);
        }
  
      /* Maybe encode the character in *CHAR2B.  */
      if (charset != CHARSET_ASCII)
        {
          struct font_info *font_info
            = FONT_INFO_FROM_ID (f, face->font_info_id);
          if (font_info)
            {
              x_encode_char (c, char2b, font_info);
              if (charset == charset_latin_iso8859_1)
                {
                  xassert (((XFontStruct *) font_info->font)->max_char_or_byte2
                           >= 0x80);
                  char2b->byte2 |= 0x80;
                }
            }
        }
    }

  /* Make sure X resources of the face are allocated.  */
  xassert (face != NULL);
  PREPARE_FACE_FOR_DISPLAY (f, face);
  
  return face;
}


/* Get face and two-byte form of character glyph GLYPH on frame F.
   The encoding of GLYPH->u.ch.code is returned in *CHAR2B.  Value is
   a pointer to a realized face that is ready for display.  */

static INLINE struct face *
x_get_glyph_face_and_encoding (f, glyph, char2b)
     struct frame *f;
     struct glyph *glyph;
     XChar2b *char2b;
{
  struct face *face;

  xassert (glyph->type == CHAR_GLYPH);
  face = FACE_FROM_ID (f, glyph->u.ch.face_id);

  if (!glyph->multibyte_p)
    {
      /* Unibyte case.  We don't have to encode, but we have to make
         sure to use a face suitable for unibyte.  */
      char2b->byte1 = 0;
      char2b->byte2 = glyph->u.ch.code;
    }
  else if (glyph->u.ch.code < 128
           && glyph->u.ch.face_id < BASIC_FACE_ID_SENTINEL)
    {
      /* Case of ASCII in a face known to fit ASCII.  */
      char2b->byte1 = 0;
      char2b->byte2 = glyph->u.ch.code;
    }
  else
    {
      int c1, c2, charset;
      
      /* Split characters into bytes.  If c2 is -1 afterwards, C is
         really a one-byte character so that byte1 is zero.  */
      SPLIT_CHAR (glyph->u.ch.code, charset, c1, c2);
      if (c2 > 0)
        char2b->byte1 = c1, char2b->byte2 = c2;
      else
        char2b->byte1 = 0, char2b->byte2 = c1;

      /* Maybe encode the character in *CHAR2B.  */
      if (charset != CHARSET_ASCII)
        {
          struct font_info *font_info
            = FONT_INFO_FROM_ID (f, face->font_info_id);
          if (font_info)
            {
              x_encode_char (glyph->u.ch.code, char2b, font_info);
              if (charset == charset_latin_iso8859_1)
                char2b->byte2 |= 0x80;
            }
        }
    }

  /* Make sure X resources of the face are allocated.  */
  xassert (face != NULL);
  PREPARE_FACE_FOR_DISPLAY (f, face);
  return face;
}


/* Store one glyph for IT->char_to_display in IT->glyph_row.  
   Called from x_produce_glyphs when IT->glyph_row is non-null.  */

static INLINE void
x_append_glyph (it)
     struct it *it;
{
  struct glyph *glyph;
  enum glyph_row_area area = it->area;
  
  xassert (it->glyph_row);
  xassert (it->char_to_display != '\n' && it->char_to_display != '\t');
  
  glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
  if (glyph < it->glyph_row->glyphs[area + 1])
    {
      /* Play it safe.  If sub-structures of the glyph are not all the
         same size, it otherwise be that some bits stay set.  This
         would prevent a comparison with GLYPH_EQUAL_P.  */
      glyph->u.val = 0;
      
      glyph->type = CHAR_GLYPH;
      glyph->pixel_width = it->pixel_width;
      glyph->u.ch.code = it->char_to_display;
      glyph->u.ch.face_id = it->face_id;
      glyph->charpos = CHARPOS (it->position);
      glyph->object = it->object;
      glyph->left_box_line_p = it->start_of_box_run_p;
      glyph->right_box_line_p = it->end_of_box_run_p;
      glyph->voffset = it->voffset;
      glyph->multibyte_p = it->multibyte_p;
      ++it->glyph_row->used[area];
    }
}


/* Change IT->ascent and IT->height according to the setting of
   IT->voffset.  */

static INLINE void
take_vertical_position_into_account (it)
     struct it *it;
{
  if (it->voffset)
    {
      if (it->voffset < 0)
        /* Increase the ascent so that we can display the text higher
           in the line.  */
        it->ascent += abs (it->voffset);
      else
        /* Increase the descent so that we can display the text lower
           in the line.  */
        it->descent += it->voffset;
    }
}


/* Produce glyphs/get display metrics for the image IT is loaded with.
   See the description of struct display_iterator in dispextern.h for
   an overview of struct display_iterator.  */

static void
x_produce_image_glyph (it)
     struct it *it;
{
  struct image *img;
  struct face *face;

  xassert (it->what == IT_IMAGE);

  face = FACE_FROM_ID (it->f, it->face_id);
  img = IMAGE_FROM_ID (it->f, it->image_id);
  xassert (img);

  /* Make sure X resources of the face and image are loaded.  */
  PREPARE_FACE_FOR_DISPLAY (it->f, face);
  prepare_image_for_display (it->f, img);

  it->ascent = IMAGE_ASCENT (img);
  it->descent = img->height + 2 * img->margin - it->ascent;
  it->pixel_width = img->width + 2 * img->margin;

  it->nglyphs = 1;
  
  if (face->box != FACE_NO_BOX)
    {
      it->ascent += face->box_line_width;
      it->descent += face->box_line_width;
      
      if (it->start_of_box_run_p)
        it->pixel_width += face->box_line_width;
      if (it->end_of_box_run_p)
        it->pixel_width += face->box_line_width;
    }

  take_vertical_position_into_account (it);
  
  if (it->glyph_row)
    {
      struct glyph *glyph;
      enum glyph_row_area area = it->area;
      
      glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
      if (glyph < it->glyph_row->glyphs[area + 1])
        {
          glyph->type = IMAGE_GLYPH;
          glyph->u.img.id = img->id;
          glyph->u.img.face_id = it->face_id;
          glyph->pixel_width = it->pixel_width;
          glyph->charpos = CHARPOS (it->position);
          glyph->object = it->object;
          glyph->left_box_line_p = it->start_of_box_run_p;
          glyph->right_box_line_p = it->end_of_box_run_p;
          glyph->voffset = it->voffset;
          glyph->multibyte_p = it->multibyte_p;
          ++it->glyph_row->used[area];
        }
    }
}


/* Append a stretch glyph to IT->glyph_row.  OBJECT is the source
   of the glyph, WIDTH and HEIGHT are the width and height of the 
   stretch.  ASCENT is the percentage/100 of HEIGHT to use for the 
   ascent of the glyph (0 <= ASCENT <= 1).  */
  
static void
x_append_stretch_glyph (it, object, width, height, ascent)
     struct it *it;
     Lisp_Object object;
     int width, height;
     double ascent;
{
  struct glyph *glyph;
  enum glyph_row_area area = it->area;

  xassert (ascent >= 0 && ascent <= 1);
  
  glyph = it->glyph_row->glyphs[area] + it->glyph_row->used[area];
  if (glyph < it->glyph_row->glyphs[area + 1])
    {
      glyph->type = STRETCH_GLYPH;
      glyph->u.stretch.ascent = height * ascent;
      glyph->u.stretch.height = height;
      glyph->u.stretch.face_id = it->face_id;
      glyph->pixel_width = width;
      glyph->charpos = CHARPOS (it->position);
      glyph->object = object;
      glyph->left_box_line_p = it->start_of_box_run_p;
      glyph->right_box_line_p = it->end_of_box_run_p;
      glyph->voffset = it->voffset;
      glyph->multibyte_p = it->multibyte_p;
      ++it->glyph_row->used[area];
    }
}


/* Produce a stretch glyph for iterator IT.  IT->object is the value
   of the glyph property displayed.  The value must be a list
   `(space KEYWORD VALUE ...)' with the following KEYWORD/VALUE pairs
   being recognized:

   1. `:width WIDTH' specifies that the space should be WIDTH *
   canonical char width wide.  WIDTH may be an integer or floating 
   point number.

   2. `:relative-width FACTOR' specifies that the width of the stretch
   should be computed from the width of the first character having the
   `glyph' property, and should be FACTOR times that width.

   3. `:align-to HPOS' specifies that the space should be wide enough
   to reach HPOS, a value in canonical character units.

   Exactly one of the above pairs must be present.  

   4. `:height HEIGHT' specifies that the height of the stretch produced
   should be HEIGHT, measured in canonical character units.

   5. `:relative-height FACTOR' specifies that the height of the the
   stretch should be FACTOR times the height of the characters having
   the glyph property.

   Either none or exactly one of 4 or 5 must be present.

   6. `:ascent ASCENT'  specifies that ASCENT percent of the height
   of the stretch should be used for the ascent of the stretch.
   ASCENT must be in the range 0 <= ASCENT <= 100.  */

#define NUMVAL(X)                               \
     ((INTEGERP (X) || FLOATP (X))              \
      ? XFLOATINT (X)                           \
      : - 1)


static void
x_produce_stretch_glyph (it)
     struct it *it;
{
  /* (space :width WIDTH :height HEIGHT.  */
  extern Lisp_Object QCwidth, QCheight, QCascent, Qspace;
  extern Lisp_Object QCrelative_width, QCrelative_height;
  extern Lisp_Object QCalign_to;
  Lisp_Object prop, plist;
  double width = 0, height = 0, ascent = 0;
  struct face *face = FACE_FROM_ID (it->f, it->face_id);
  XFontStruct *font = face->font ? face->font : FRAME_FONT (it->f);

  PREPARE_FACE_FOR_DISPLAY (it->f, face);
  
  /* List should start with `space'.  */
  xassert (CONSP (it->object) && EQ (XCAR (it->object), Qspace));
  plist = XCDR (it->object);

  /* Compute the width of the stretch.  */
  if (prop = Fplist_get (plist, QCwidth),
      NUMVAL (prop) > 0)
    /* Absolute width `:width WIDTH' specified and valid.  */
    width = NUMVAL (prop) * CANON_X_UNIT (it->f);
  else if (prop = Fplist_get (plist, QCrelative_width),
           NUMVAL (prop) > 0)
    {
      /* Relative width `:relative-width FACTOR' specified and valid.
         Compute the width of the characters having the `glyph'
         property.  */
      struct it it2;
      unsigned char *p = BYTE_POS_ADDR (IT_BYTEPOS (*it));
      
      it2 = *it;
      if (it->multibyte_p)
        {
          int maxlen = ((IT_BYTEPOS (*it) >= GPT ? ZV : GPT)
                        - IT_BYTEPOS (*it));
          it2.c = STRING_CHAR_AND_LENGTH (p, maxlen, it2.len);
        }
      else
        it2.c = *p, it2.len = 1;

      it2.glyph_row = NULL;
      it2.what = IT_CHARACTER;
      x_produce_glyphs (&it2);
      width = NUMVAL (prop) * it2.pixel_width;
    }
  else if (prop = Fplist_get (plist, QCalign_to),
           NUMVAL (prop) > 0)
    width = NUMVAL (prop) * CANON_X_UNIT (it->f) - it->current_x;
  else
    /* Nothing specified -> width defaults to canonical char width.  */
    width = CANON_X_UNIT (it->f);
  
  /* Compute height.  */
  if (prop = Fplist_get (plist, QCheight),
      NUMVAL (prop) > 0)
    height = NUMVAL (prop) * CANON_Y_UNIT (it->f);
  else if (prop = Fplist_get (plist, QCrelative_height),
           NUMVAL (prop) > 0)
    height = FONT_HEIGHT (font) * NUMVAL (prop);
  else
    height = FONT_HEIGHT (font);

  /* Compute percentage of height used for ascent.  If 
     `:ascent ASCENT' is present and valid, use that.  Otherwise,
     derive the ascent from the font in use.  */
  if (prop = Fplist_get (plist, QCascent),
      NUMVAL (prop) > 0 && NUMVAL (prop) <= 100)
    ascent = NUMVAL (prop) / 100.0;
  else
    ascent = (double) font->ascent / FONT_HEIGHT (font);

  if (width <= 0)
    width = 1;
  if (height <= 0)
    height = 1;

  if (it->glyph_row)
    {
      Lisp_Object object = it->stack[it->sp - 1].string;
      if (!STRINGP (object))
        object = it->w->buffer;
      x_append_stretch_glyph (it, object, width, height, ascent);
    }

  it->pixel_width = width;
  it->ascent = height * ascent;
  it->descent = height - it->ascent;
  it->nglyphs = 1;

  if (face->box != FACE_NO_BOX)
    {
      it->ascent += face->box_line_width;
      it->descent += face->box_line_width;
      
      if (it->start_of_box_run_p)
        it->pixel_width += face->box_line_width;
      if (it->end_of_box_run_p)
        it->pixel_width += face->box_line_width;
    }
  
  take_vertical_position_into_account (it);
}


/* Produce glyphs/get display metrics for the display element IT is
   loaded with.  See the description of struct display_iterator in
   dispextern.h for an overview of struct display_iterator.  */

static void
x_produce_glyphs (it)
     struct it *it;
{
  if (it->what == IT_CHARACTER)
    {
      XChar2b char2b;
      XFontStruct *font;
      struct face *face;
      XCharStruct *pcm;
      struct it ci;
      int font_not_found_p;
      int c;

      /* Maybe translate single-byte characters to multibyte.  */
      it->char_to_display = it->c;
      if (unibyte_display_via_language_environment
          && SINGLE_BYTE_CHAR_P (it->c)
          && (it->c >= 0240
              || (it->c >= 0200
                  && !NILP (Vnonascii_translation_table))))
        {
          it->char_to_display = unibyte_char_to_multibyte (it->c);
          it->charset = CHAR_CHARSET (it->char_to_display);
        }
      
      /* Get face and font to use.  Encode IT->char_to_display.  */
      face = x_get_char_face_and_encoding (it->f, it->char_to_display,
                                           it->face_id, &char2b,
                                           it->multibyte_p);
      font = face->font;

      /* When no suitable font found, use the default font.  */
      font_not_found_p = font == NULL;
      if (font_not_found_p)
        font = FRAME_FONT (it->f);

      if (it->char_to_display >= ' '
          && (!it->multibyte_p || it->char_to_display < 128))
        {
          /* Either unibyte or ASCII.  */
          int stretched_p;

          it->nglyphs = 1;
          it->ascent = font->ascent;
          it->descent = font->descent;

          pcm = x_per_char_metric (font, &char2b);
          it->pixel_width = pcm->width;

          /* If this is a space inside a region of text with
             `space-width' property, change its width.  */
          stretched_p = it->char_to_display == ' ' && !NILP (it->space_width);
          if (stretched_p)
            it->pixel_width *= XFLOATINT (it->space_width);

          /* If face has a box, add the box thickness to the character
             height.  If character has a box line to the left and/or
             right, add the box line width to the character's width.  */
          if (face->box != FACE_NO_BOX)
            {
              int thick = face->box_line_width;
              
              it->ascent += thick;
              it->descent += thick;
              
              if (it->start_of_box_run_p)
                it->pixel_width += thick;
              if (it->end_of_box_run_p)
                it->pixel_width += thick;
            }

          /* If face has an overline, add the height of the overline
             (1 pixel) and a 1 pixel margin to the character height.  */
          if (face->overline_p)
            it->ascent += 2;

          take_vertical_position_into_account (it);
  
          /* If we have to actually produce glyphs, do it.  */
          if (it->glyph_row)
            {
              if (stretched_p)
                {
                  /* Translate a space with a `space-width' property
                     into a stretch glyph.  */
                  double ascent = (double) font->ascent / FONT_HEIGHT (font);
                  x_append_stretch_glyph (it, it->object, it->pixel_width, 
                                          it->ascent + it->descent, ascent);
                }
              else
                x_append_glyph (it);

              /* If characters with lbearing or rbearing are displayed
                 in this line, record that fact in a flag of the
                 glyph row.  This is used to optimize X output code.  */
              if (pcm->lbearing < 0
                  || pcm->rbearing > pcm->width)
                it->glyph_row->contains_overlapping_glyphs_p = 1;
            }
        }
      else if (it->char_to_display == '\n')
        {
          /* A newline has no width but we need the height of the line.  */
          it->pixel_width = 0;
          it->nglyphs = 0;
          it->ascent = font->ascent;
          it->descent = font->descent;
      
          if (face->box != FACE_NO_BOX)
            {
              int thick = face->box_line_width;
              it->ascent += thick;
              it->descent += thick;
            }
        }
      else if (it->char_to_display == '\t')
        {
          int tab_width = it->tab_width * CANON_X_UNIT (it->f);
          int x = (it->current_x
                   - it->prompt_width
                   + it->continuation_lines_width);
          int next_tab_x = ((1 + x + tab_width - 1) / tab_width) * tab_width;
      
          it->pixel_width = next_tab_x - x;
          it->nglyphs = 1;
          it->ascent = font->ascent;
          it->descent = font->descent;
          
          if (it->glyph_row)
            {
              double ascent = (double) it->ascent / (it->ascent + it->descent);
              x_append_stretch_glyph (it, it->object, it->pixel_width, 
                                      it->ascent + it->descent, ascent);
            }
        }
      else 
        {
          /* A multi-byte character.  Assume that the display width of the
             character is the width of the character multiplied by the
             width of the font.  There has to be better support for
             variable sizes in cmpchar_info to do anything better than
             that.

             Note: composite characters are represented as one glyph in
             the glyph matrix.  There are no padding glyphs.  */
          if (it->charset == CHARSET_COMPOSITION)
            {
              struct cmpchar_info *cmpcharp;
              int idx;

              idx = COMPOSITE_CHAR_ID (it->char_to_display);
              cmpcharp = cmpchar_table[idx];
              it->pixel_width = font->max_bounds.width * cmpcharp->width;
          
              /* There are no padding glyphs, so there is only one glyph
                 to produce for the composite char.  Important is that
                 pixel_width, ascent and descent are the values of what is
                 drawn by draw_glyphs.  */
              it->nglyphs = 1;

              /* These settings may not be correct.  We must have more
                 information in cmpcharp to do the correct setting.  */
              it->ascent = font->ascent;
              it->descent = font->descent;
            }
          else
            {
              /* If we found a font, this font should give us the right
                 metrics.  If we didn't find a font, use the frame's
                 default font and calculate the width of the character
                 from the charset width; this is what old redisplay code
                 did.  */
              pcm = x_per_char_metric (font, &char2b);
              it->pixel_width = pcm->width;
              if (font_not_found_p)
                it->pixel_width *= CHARSET_WIDTH (it->charset);
              it->nglyphs = 1;
              it->ascent = font->ascent;
              it->descent = font->descent;
              if (it->glyph_row
                  && (pcm->lbearing < 0
                      || pcm->rbearing > pcm->width))
                it->glyph_row->contains_overlapping_glyphs_p = 1;
            }
        
          if (face->box != FACE_NO_BOX)
            {
              int thick = face->box_line_width;
              it->ascent += thick;
              it->descent += thick;
          
              if (it->start_of_box_run_p)
                it->pixel_width += thick;
              if (it->end_of_box_run_p)
                it->pixel_width += thick;
            }
  
          /* If face has an overline, add the height of the overline
             (1 pixel) and a 1 pixel margin to the character height.  */
          if (face->overline_p)
            it->ascent += 2;

          take_vertical_position_into_account (it);
  
          if (it->glyph_row)
            x_append_glyph (it);
        }
    }
  else if (it->what == IT_IMAGE)
    x_produce_image_glyph (it);
  else if (it->what == IT_STRETCH)
    x_produce_stretch_glyph (it);

  /* Accumulate dimensions.  */
  xassert (it->ascent >= 0 && it->descent > 0);
  if (it->area == TEXT_AREA)
    it->current_x += it->pixel_width;
  it->max_ascent = max (it->max_ascent, it->ascent);
  it->max_descent = max (it->max_descent, it->descent);
}


/* Estimate the pixel height of the mode or top line on frame F.
   FACE_ID specifies what line's height to estimate.  */

int
x_estimate_mode_line_height (f, face_id)
     struct frame *f;
     enum face_id face_id;
{
  int height = 1;

  /* This function is called so early when Emacs starts that the face
     cache and mode line face are not yet initialized.  */
  if (FRAME_FACE_CACHE (f))
      {
        struct face *face = FACE_FROM_ID (f, face_id);
        if (face)
          height = FONT_HEIGHT (face->font) + 2 * face->box_line_width;
      }
  
  return height;
}

\f
/***********************************************************************
                            Glyph display
 ***********************************************************************/

/* A sequence of glyphs to be drawn in the same face.

   This data structure is not really completely X specific, so it
   could possibly, at least partially, be useful for other systems.  It
   is currently not part of the external redisplay interface because
   it's not clear what other systems will need.  */

struct glyph_string
{
  /* X-origin of the string.  */
  int x;

  /* Y-origin and y-position of the base line of this string.  */
  int y, ybase;

  /* The width of the string, not including a face extension.  */
  int width;

  /* The width of the string, including a face extension.  */
  int background_width;

  /* The height of this string.  This is the height of the line this
     string is drawn in, and can be different from the height of the
     font the string is drawn in.  */
  int height;

  /* Number of pixels this string overwrites in front of its x-origin.
     This number is zero if the string has an lbearing >= 0; it is
     -lbearing, if the string has an lbearing < 0.  */
  int left_overhang;

  /* Number of pixels this string overwrites past its right-most
     nominal x-position, i.e. x + width.  Zero if the string's
     rbearing is <= its nominal width, rbearing - width otherwise.  */
  int right_overhang;

  /* The frame on which the glyph string is drawn.  */
  struct frame *f;

  /* The window on which the glyph string is drawn.  */
  struct window *w;

  /* X display and window for convenience.  */
  Display *display;
  Window window;

  /* The glyph row for which this string was built.  It determines the
     y-origin and height of the string.  */
  struct glyph_row *row;

  /* The area within row.  */
  enum glyph_row_area area;

  /* Characters to be drawn, and number of characters.  */
  XChar2b *char2b;
  int nchars;

  /* Character set of this glyph string.  */
  int charset;

  /* A face-override for drawing cursors, mouse face and similar.  */
  enum draw_glyphs_face hl;

  /* Face in which this string is to be drawn.  */
  struct face *face;

  /* Font in which this string is to be drawn.  */
  XFontStruct *font;

  /* Font info for this string.  */
  struct font_info *font_info;

  /* Non-null means this string describes (part of) a composite
     character.  All characters from char2b are drawn at the same
     x-origin in that case.  */
  struct cmpchar_info *cmpcharp;

  /* Index of this glyph string's first character in the glyph
     definition of cmpcharp.  If this is zero, this glyph string
     describes the first character of a composite character.  */
  int gidx;

  /* 1 means this glyph strings face has to be drawn to the right end
     of the window's drawing area.  */
  unsigned extends_to_end_of_line_p : 1;

  /* 1 means the background of this string has been drawn.  */
  unsigned background_filled_p : 1;

  /* 1 means glyph string must be drawn with 16-bit functions.  */
  unsigned two_byte_p : 1;

  /* 1 means that the original font determined for drawing this glyph
     string could not be loaded.  The member `font' has been set to
     the frame's default font in this case.  */
  unsigned font_not_found_p : 1;

  /* 1 means that the face in which this glyph string is drawn has a
     stipple pattern.  */
  unsigned stippled_p : 1;

  /* The GC to use for drawing this glyph string.  */
  GC gc;

  /* A pointer to the first glyph in the string.  This glyph
     corresponds to char2b[0].  Needed to draw rectangles if
     font_not_found_p is 1.  */
  struct glyph *first_glyph;

  /* Image, if any.  */
  struct image *img;

  struct glyph_string *next, *prev;
};


#if GLYPH_DEBUG

static void
x_dump_glyph_string (s)
     struct glyph_string *s;
{
  fprintf (stderr, "glyph string\n");
  fprintf (stderr, "  x, y, w, h = %d, %d, %d, %d\n",
           s->x, s->y, s->width, s->height);
  fprintf (stderr, "  ybase = %d\n", s->ybase);
  fprintf (stderr, "  hl = %d\n", s->hl);
  fprintf (stderr, "  left overhang = %d, right = %d\n",
           s->left_overhang, s->right_overhang);
  fprintf (stderr, "  nchars = %d\n", s->nchars);
  fprintf (stderr, "  extends to end of line = %d\n",
           s->extends_to_end_of_line_p);
  fprintf (stderr, "  font height = %d\n", FONT_HEIGHT (s->font));
  fprintf (stderr, "  bg width = %d\n", s->background_width);
}

#endif /* GLYPH_DEBUG */



static void x_append_glyph_string_lists P_ ((struct glyph_string **,
                                             struct glyph_string **,
                                             struct glyph_string *,
                                             struct glyph_string *));
static void x_prepend_glyph_string_lists P_ ((struct glyph_string **,
                                              struct glyph_string **,
                                              struct glyph_string *,
                                              struct glyph_string *));
static void x_append_glyph_string P_ ((struct glyph_string **,
                                       struct glyph_string **,
                                       struct glyph_string *));
static int x_left_overwritten P_ ((struct glyph_string *));
static int x_left_overwriting P_ ((struct glyph_string *));
static int x_right_overwritten P_ ((struct glyph_string *));
static int x_right_overwriting P_ ((struct glyph_string *));
static int x_fill_glyph_string P_ ((struct glyph_string *, int, int, int));
static void x_init_glyph_string P_ ((struct glyph_string *,
                                        XChar2b *, struct window *,
                                        struct glyph_row *,
                                        enum glyph_row_area, int, 
                                        enum draw_glyphs_face));
static int x_draw_glyphs P_ ((struct window *, int , struct glyph_row *,
                              enum glyph_row_area, int, int,
                              enum draw_glyphs_face, int *, int *));
static void x_set_glyph_string_clipping P_ ((struct glyph_string *));
static void x_set_glyph_string_gc P_ ((struct glyph_string *));
static void x_draw_glyph_string_background P_ ((struct glyph_string *,
                                                int));
static void x_draw_glyph_string_foreground P_ ((struct glyph_string *));
static void x_draw_glyph_string_underline P_ ((struct glyph_string *));
static void x_draw_glyph_string_box P_ ((struct glyph_string *));
static void x_draw_glyph_string  P_ ((struct glyph_string *));
static void x_compute_glyph_string_overhangs P_ ((struct glyph_string *));
static void x_set_cursor_gc P_ ((struct glyph_string *));
static void x_set_mode_line_face_gc P_ ((struct glyph_string *));
static void x_set_mouse_face_gc P_ ((struct glyph_string *));
static void x_get_glyph_overhangs P_ ((struct glyph *, struct frame *,
                                       int *, int *));
static void x_compute_overhangs_and_x P_ ((struct glyph_string *, int, int));
static int x_alloc_lighter_color P_ ((struct frame *, Display *, Colormap,
                                      unsigned long *, float, int));
static void x_setup_relief_color P_ ((struct frame *, struct relief *,
                                      float, int, unsigned long));
static void x_setup_relief_colors P_ ((struct glyph_string *));
static void x_draw_image_glyph_string P_ ((struct glyph_string *));
static void x_draw_image_relief P_ ((struct glyph_string *));
static void x_draw_image_foreground P_ ((struct glyph_string *));
static void x_draw_image_foreground_1 P_ ((struct glyph_string *, Pixmap));
static void x_fill_image_glyph_string P_ ((struct glyph_string *));
static void x_clear_glyph_string_rect P_ ((struct glyph_string *, int,
                                           int, int, int));
static void x_draw_relief_rect P_ ((struct frame *, int, int, int, int,
                                    int, int, int, int, XRectangle *));
static void x_draw_box_rect P_ ((struct glyph_string *, int, int, int, int,
                                 int, int, int, XRectangle *));


     
/* Append the list of glyph strings with head H and tail T to the list
   with head *HEAD and tail *TAIL.  Set *HEAD and *TAIL to the result.  */

static INLINE void
x_append_glyph_string_lists (head, tail, h, t)
     struct glyph_string **head, **tail;
     struct glyph_string *h, *t;
{
  if (h)
    {
      if (*head)
        (*tail)->next = h;
      else
        *head = h;
      h->prev = *tail;
      *tail = t;
    }
}


/* Prepend the list of glyph strings with head H and tail T to the
   list with head *HEAD and tail *TAIL.  Set *HEAD and *TAIL to the
   result.  */

static INLINE void
x_prepend_glyph_string_lists (head, tail, h, t)
     struct glyph_string **head, **tail;
     struct glyph_string *h, *t;
{
  if (h)
    {
      if (*head)
        (*head)->prev = t;
      else
        *tail = t;
      t->next = *head;
      *head = h;
    }
}


/* Append glyph string S to the list with head *HEAD and tail *TAIL.
   Set *HEAD and *TAIL to the resulting list.  */

static INLINE void
x_append_glyph_string (head, tail, s)
     struct glyph_string **head, **tail;
     struct glyph_string *s;
{
  s->next = s->prev = NULL;
  x_append_glyph_string_lists (head, tail, s, s);
}


/* Set S->gc to a suitable GC for drawing glyph string S in cursor
   face.  */

static void
x_set_cursor_gc (s)
     struct glyph_string *s;
{
  if (s->font == FRAME_FONT (s->f)
      && s->face->background == FRAME_BACKGROUND_PIXEL (s->f)
      && s->face->foreground == FRAME_FOREGROUND_PIXEL (s->f)
      && !s->cmpcharp)
    s->gc = s->f->output_data.x->cursor_gc;
  else
    {
      /* Cursor on non-default face: must merge.  */
      XGCValues xgcv;
      unsigned long mask;

      xgcv.background = s->f->output_data.x->cursor_pixel;
      xgcv.foreground = s->face->background;

      /* If the glyph would be invisible, try a different foreground.  */
      if (xgcv.foreground == xgcv.background)
        xgcv.foreground = s->face->foreground;
      if (xgcv.foreground == xgcv.background)
        xgcv.foreground = s->f->output_data.x->cursor_foreground_pixel;
      if (xgcv.foreground == xgcv.background)
        xgcv.foreground = s->face->foreground;

      /* Make sure the cursor is distinct from text in this face.  */
      if (xgcv.background == s->face->background
          && xgcv.foreground == s->face->foreground)
        {
          xgcv.background = s->face->foreground;
          xgcv.foreground = s->face->background;
        }

      IF_DEBUG (x_check_font (s->f, s->font));
      xgcv.font = s->font->fid;
      xgcv.graphics_exposures = False;
      mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;

      if (FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc)
        XChangeGC (s->display, FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc,
                   mask, &xgcv);
      else
        FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc
          = XCreateGC (s->display, s->window, mask, &xgcv);

      s->gc = FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc;
    }
}


/* Set up S->gc of glyph string S for drawing text in mouse face.  */
   
static void
x_set_mouse_face_gc (s)
     struct glyph_string *s;
{     
  int face_id;

  /* What face has to be used for the mouse face?  */
  face_id = FRAME_X_DISPLAY_INFO (s->f)->mouse_face_face_id;
  face_id = FACE_FOR_CHARSET (s->f, face_id, s->charset);
  s->face = FACE_FROM_ID (s->f, face_id);
  PREPARE_FACE_FOR_DISPLAY (s->f, s->face);

  /* If font in this face is same as S->font, use it.  */
  if (s->font == s->face->font)
    s->gc = s->face->gc;
  else
    {
      /* Otherwise construct scratch_cursor_gc with values from FACE
         but font FONT.  */
      XGCValues xgcv;
      unsigned long mask;
      
      xgcv.background = s->face->background;
      xgcv.foreground = s->face->foreground;
      IF_DEBUG (x_check_font (s->f, s->font));
      xgcv.font = s->font->fid;
      xgcv.graphics_exposures = False;
      mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
      
      if (FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc)
        XChangeGC (s->display, FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc,
                   mask, &xgcv);
      else
        FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc
          = XCreateGC (s->display, s->window, mask, &xgcv);
      
      s->gc = FRAME_X_DISPLAY_INFO (s->f)->scratch_cursor_gc;
    }

  xassert (s->gc != 0);
}


/* Set S->gc of glyph string S to a GC suitable for drawing a mode line.
   Faces to use in the mode line have already been computed when the
   matrix was built, so there isn't much to do, here.  */

static INLINE void
x_set_mode_line_face_gc (s)
     struct glyph_string *s;
{     
  s->gc = s->face->gc;
  xassert (s->gc != 0);
}


/* Set S->gc of glyph string S for drawing that glyph string.  Set
   S->stippled_p to a non-zero value if the face of S has a stipple
   pattern.  */

static INLINE void
x_set_glyph_string_gc (s)
     struct glyph_string *s;
{
  if (s->hl == DRAW_NORMAL_TEXT)
    {
      s->gc = s->face->gc;
      s->stippled_p = s->face->stipple != 0;
    }
  else if (s->hl == DRAW_INVERSE_VIDEO)
    {
      x_set_mode_line_face_gc (s);
      s->stippled_p = s->face->stipple != 0;
    }
  else if (s->hl == DRAW_CURSOR)
    {
      x_set_cursor_gc (s);
      s->stippled_p = 0;
    }
  else if (s->hl == DRAW_MOUSE_FACE)
    {
      x_set_mouse_face_gc (s);
      s->stippled_p = s->face->stipple != 0;
    }
  else if (s->hl == DRAW_IMAGE_RAISED
           || s->hl == DRAW_IMAGE_SUNKEN)
    {
      s->gc = s->face->gc;
      s->stippled_p = s->face->stipple != 0;
    }
  else
    {
      s->gc = s->face->gc;
      s->stippled_p = s->face->stipple != 0;
    }

  /* GC must have been set.  */
  xassert (s->gc != 0);
}


/* Return in *R the clipping rectangle for glyph string S.  */

static void
x_get_glyph_string_clip_rect (s, r)
     struct glyph_string *s;
     XRectangle *r;
{
  if (s->row->full_width_p)
    {
      /* Draw full-width.  X coordinates are relative to S->w->left.  */
      r->x = WINDOW_LEFT_MARGIN (s->w) * CANON_X_UNIT (s->f);
      r->width = XFASTINT (s->w->width) * CANON_X_UNIT (s->f);

      if (FRAME_HAS_VERTICAL_SCROLL_BARS (s->f))
        {
          int width = FRAME_SCROLL_BAR_WIDTH (s->f) * CANON_X_UNIT (s->f);
          r->width += width;
          if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_LEFT (s->f))
            r->x -= width;
        }
      
      /* Unless displaying a mode or menu bar line, which are always
         fully visible, clip to the visible part of the row.  */
      if (s->w->pseudo_window_p)
        r->height = s->row->visible_height;
      else
        r->height = s->height;
    }
  else
    {
      /* This is a text line that may be partially visible.  */
      r->x = WINDOW_AREA_TO_FRAME_PIXEL_X (s->w, s->area, 0);
      r->width = window_box_width (s->w, s->area);
      r->height = s->row->visible_height;
    }

  /* Don't use S->y for clipping because it doesn't take partially
     visible lines into account.  For example, it can be negative for
     partially visible lines at the top of a window.  */
  if (!s->row->full_width_p
      && MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P (s->w, s->row))
    r->y = WINDOW_DISPLAY_TOP_LINE_HEIGHT (s->w);
  else
    r->y = max (0, s->row->y);
  r->y = WINDOW_TO_FRAME_PIXEL_Y (s->w, r->y);

  /* If drawing a toolbar window, draw it over the internal border
     at the top of the window.  */
  if (s->w == XWINDOW (s->f->toolbar_window))
    r->y -= s->f->output_data.x->internal_border_width;
}


/* Set clipping for output of glyph string S.  S may be part of a mode
   line or menu if we don't have X toolkit support.  */

static INLINE void
x_set_glyph_string_clipping (s)
     struct glyph_string *s;
{
  XRectangle r;
  x_get_glyph_string_clip_rect (s, &r);
  XSetClipRectangles (s->display, s->gc, 0, 0, &r, 1, Unsorted);
}


/* Compute left and right overhang of glyph string S.  If S is a glyph
   string for a composite character, assume overhangs don't exist.  */

static INLINE void
x_compute_glyph_string_overhangs (s)
     struct glyph_string *s;
{
  if (s->cmpcharp == NULL
      && s->first_glyph->type == CHAR_GLYPH)
    {
      XCharStruct cs;
      int direction, font_ascent, font_descent;
      XTextExtents16 (s->font, s->char2b, s->nchars, &direction,
                      &font_ascent, &font_descent, &cs);
      s->right_overhang = cs.rbearing > cs.width ? cs.rbearing - cs.width : 0;
      s->left_overhang = cs.lbearing < 0 ? -cs.lbearing : 0;
    }
}


/* Compute overhangs and x-positions for glyph string S and its
   predecessors, or successors.  X is the starting x-position for S.
   BACKWARD_P non-zero means process predecessors.  */
   
static void
x_compute_overhangs_and_x (s, x, backward_p)
     struct glyph_string *s;
     int x;
     int backward_p;
{
  if (backward_p)
    {
      while (s)
        {
          x_compute_glyph_string_overhangs (s);
          x -= s->width;
          s->x = x;
          s = s->prev;
        }
    }
  else
    {
      while (s)
        {
          x_compute_glyph_string_overhangs (s);
          s->x = x;
          x += s->width;
          s = s->next;
        }
    }
}


/* Set *LEFT and *RIGHT to the left and right overhang of GLYPH on
   frame F.  Overhangs of glyphs other than type CHAR_GLYPH or of
   character glyphs for composite characters are assumed to be zero.  */

static void
x_get_glyph_overhangs (glyph, f, left, right)
     struct glyph *glyph;
     struct frame *f;
     int *left, *right;
{
  int c;
  
  *left = *right = 0;
  
  if (glyph->type == CHAR_GLYPH
      && (c = glyph->u.ch.code,
          CHAR_CHARSET (c) != CHARSET_COMPOSITION))
    {
      XFontStruct *font;
      struct face *face;
      struct font_info *font_info;
      XChar2b char2b;
      
      face = x_get_glyph_face_and_encoding (f, glyph, &char2b);
      font = face->font;
      font_info = FONT_INFO_FROM_ID (f, face->font_info_id);
      if (font)
        {
          XCharStruct *pcm = x_per_char_metric (font, &char2b);
          
          if (pcm->rbearing > pcm->width)
            *right = pcm->rbearing - pcm->width;
          if (pcm->lbearing < 0)
            *left = -pcm->lbearing;
        }
    }
}


/* Return the index of the first glyph preceding glyph string S that
   is overwritten by S because of S's left overhang.  Value is -1
   if no glyphs are overwritten.  */

static int
x_left_overwritten (s)
     struct glyph_string *s;
{
  int k;
    
  if (s->left_overhang)
    {
      int x = 0, i;
      struct glyph *glyphs = s->row->glyphs[s->area];
      int first = s->first_glyph - glyphs;

      for (i = first - 1; i >= 0 && x > -s->left_overhang; --i)
        x -= glyphs[i].pixel_width;

      k = i + 1;
    }
  else
    k = -1;

  return k;
}


/* Return the index of the first glyph preceding glyph string S that
   is overwriting S because of its right overhang.  Value is -1 if no
   glyph in front of S overwrites S.  */

static int
x_left_overwriting (s)
     struct glyph_string *s;
{
  int i, k, x;
  struct glyph *glyphs = s->row->glyphs[s->area];
  int first = s->first_glyph - glyphs;

  k = -1;
  x = 0;
  for (i = first - 1; i >= 0; --i)
    {
      int left, right;
      x_get_glyph_overhangs (glyphs + i, s->f, &left, &right);
      if (x + right > 0)
        k = i;
      x -= glyphs[i].pixel_width;
    }

  return k;
}


/* Return the index of the last glyph following glyph string S that is
   not overwritten by S because of S's right overhang.  Value is -1 if
   no such glyph is found.  */

static int
x_right_overwritten (s)
     struct glyph_string *s;
{
  int k = -1;

  if (s->right_overhang)
    {
      int x = 0, i;
      struct glyph *glyphs = s->row->glyphs[s->area];
      int first = (s->first_glyph - glyphs) + (s->cmpcharp ? 1 : s->nchars);
      int end = s->row->used[s->area];
      
      for (i = first; i < end && s->right_overhang > x; ++i)
        x += glyphs[i].pixel_width;

      k = i;
    }

  return k;
}


/* Return the index of the last glyph following glyph string S that
   overwrites S because of its left overhang.  Value is negative
   if no such glyph is found.  */

static int
x_right_overwriting (s)
     struct glyph_string *s;
{
  int i, k, x;
  int end = s->row->used[s->area];
  struct glyph *glyphs = s->row->glyphs[s->area];
  int first = (s->first_glyph - glyphs) + (s->cmpcharp ? 1 : s->nchars);

  k = -1;
  x = 0;
  for (i = first; i < end; ++i)
    {
      int left, right;
      x_get_glyph_overhangs (glyphs + i, s->f, &left, &right);
      if (x - left < 0)
        k = i;
      x += glyphs[i].pixel_width;
    }

  return k;
}


/* Fill rectangle X, Y, W, H with background color of glyph string S.  */

static INLINE void
x_clear_glyph_string_rect (s, x, y, w, h)
     struct glyph_string *s;
     int x, y, w, h;
{
  XGCValues xgcv;
  XGetGCValues (s->display, s->gc, GCForeground | GCBackground, &xgcv);
  XSetForeground (s->display, s->gc, xgcv.background);
  XFillRectangle (s->display, s->window, s->gc, x, y, w, h);
  XSetForeground (s->display, s->gc, xgcv.foreground);
}


/* Draw the background of glyph_string S.  If S->background_filled_p
   is non-zero don't draw it.  FORCE_P non-zero means draw the
   background even if it wouldn't be drawn normally.  This is used
   when a string preceding S draws into the background of S.  */

static void
x_draw_glyph_string_background (s, force_p)
     struct glyph_string *s;
     int force_p;
{
  /* Nothing to do if background has already been drawn or if it
     shouldn't be drawn in the first place.  */
  if (!s->background_filled_p)
    {
      if (s->cmpcharp
          && s->gidx > 0
          && !s->font_not_found_p
          && !s->extends_to_end_of_line_p)
        {
          /* Don't draw background for glyphs of a composite
             characters, except for the first one.  */
          s->background_filled_p = 1;
        }
      else if (s->stippled_p)
        {
          /* Fill background with a stipple pattern.  */
          XSetFillStyle (s->display, s->gc, FillOpaqueStippled);
          XFillRectangle (s->display, s->window, s->gc, s->x,
                          s->y + s->face->box_line_width,
                          s->background_width,
                          s->height - 2 * s->face->box_line_width);
          XSetFillStyle (s->display, s->gc, FillSolid);
          s->background_filled_p = 1;
        }
      else if (FONT_HEIGHT (s->font) < s->height - 2 * s->face->box_line_width
               || s->font_not_found_p
               || s->extends_to_end_of_line_p
               || s->cmpcharp
               || force_p)
        {
          x_clear_glyph_string_rect (s, s->x, s->y + s->face->box_line_width,
                                     s->background_width,
                                     s->height - 2 * s->face->box_line_width);
          s->background_filled_p = 1;
        }
    }
}


/* Draw the foreground of glyph string S.  */

static void
x_draw_glyph_string_foreground (s)
     struct glyph_string *s;
{
  int i, x;

  /* If first glyph of S has a left box line, start drawing the text
     of S to the right of that box line.  */
  if (s->face->box != FACE_NO_BOX
      && s->first_glyph->left_box_line_p)
    x = s->x + s->face->box_line_width;
  else
    x = s->x;

  if (s->cmpcharp == NULL)
    {
      /* Not a composite character.  Draw characters of S as
         rectangles if S's font could not be loaded.  */
      if (s->font_not_found_p)
        {
          for (i = 0; i < s->nchars; ++i)
            {
              struct glyph *g = s->first_glyph + i;
              XDrawRectangle (s->display, s->window,
                              s->gc, x, s->y, g->pixel_width - 1,
                              s->height - 1);
              x += g->pixel_width;
            }
        }
      else
        {
          char *char1b = (char *) s->char2b;

          /* If we can use 8-bit functions, condense S->char2b.  */
          if (!s->two_byte_p)
            for (i = 0; i < s->nchars; ++i)
              char1b[i] = s->char2b[i].byte2;

          /* Draw text with XDrawString if background has already been
             filled.  Otherwise, use XDrawImageString.  (Note that
             XDrawImageString is usually faster than XDrawString.)
             Always use XDrawImageString when drawing the cursor so
             that there is no chance that characters under a box
             cursor are invisible.  */
          if (s->background_filled_p && s->hl != DRAW_CURSOR)
            {
              /* Draw characters with 16-bit or 8-bit functions.  */
              if (s->two_byte_p)
                XDrawString16 (s->display, s->window, s->gc, x, s->ybase, 
                               s->char2b, s->nchars);
              else
                XDrawString (s->display, s->window, s->gc, x, s->ybase, 
                             char1b, s->nchars);
            }
          else
            {
              if (s->two_byte_p)
                XDrawImageString16 (s->display, s->window, s->gc,
                                    x, s->ybase, s->char2b, s->nchars);
              else
                XDrawImageString (s->display, s->window, s->gc,
                                  x, s->ybase, char1b, s->nchars);
            }
        }
    }
  else
    {
      /* S is a glyph string for a composite character. S->gidx is the
         index of the first character drawn in the vector
         S->cmpcharp->glyph.  S->gidx == 0 means we are drawing the
         very first component character of a composite char.  */

      /* Draw a single rectangle for the composite character if S's
         font could not be loaded.  */
      if (s->font_not_found_p && s->gidx == 0)
        XDrawRectangle (s->display, s->window, s->gc, x, s->y,
                        s->width - 1, s->height - 1);
      else
        {
          XCharStruct *pcm;
          int relative_compose, default_ascent, i;
          int highest = 0, lowest = 0;

          /* The value of font_info my be null if we couldn't find it
             in x_get_char_face_and_encoding.  */
          if (s->cmpcharp->cmp_rule == NULL && s->font_info)
            {
              relative_compose = s->font_info->relative_compose;
              default_ascent = s->font_info->default_ascent;
            }
          else
            relative_compose = default_ascent = 0;

          if ((s->cmpcharp->cmp_rule || relative_compose)
              && s->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;
              int first_ch = s->first_glyph->u.ch.code;

              if (default_ascent
                  && CHAR_TABLE_P (Vuse_default_ascent)
                  && !NILP (Faref (Vuse_default_ascent, first_ch)))
                {
                  highest = default_ascent;
                  lowest = 0;
                }
              else
                {
                  pcm = PER_CHAR_METRIC (s->font, s->char2b);
                  highest = pcm->ascent + 1;
                  lowest = - pcm->descent;
                }

              if (s->cmpcharp->cmp_rule)
                x_offset = (s->cmpcharp->col_offset[0]
                            * FONT_WIDTH (s->f->output_data.x->font));

              /* Draw the first character at the normal position.  */
              XDrawString16 (s->display, s->window, s->gc,
                             x + x_offset,
                             s->ybase, s->char2b, 1);
              i = 1;
              ++s->gidx;
            }
          else
            i = 0;

          for (; i < s->nchars; i++, ++s->gidx)
            {
              int x_offset = 0, y_offset = 0;

              if (relative_compose)
                {
                  pcm = PER_CHAR_METRIC (s->font, s->char2b + i);
                  if (NILP (Vignore_relative_composition)
                      || NILP (Faref (Vignore_relative_composition,
                                      make_number (s->cmpcharp->glyph[s->gidx]))))
                    {
                      if (- pcm->descent >= relative_compose)
                        {
                          /* Draw above the current glyphs.  */
                          y_offset = highest + pcm->descent;
                          highest += pcm->ascent + pcm->descent;
                        }
                      else if (pcm->ascent <= 0)
                        {
                          /* Draw beneath the current glyphs.  */
                          y_offset = lowest - pcm->ascent;
                          lowest -= pcm->ascent + pcm->descent;
                        }
                    }
                  else
                    {
                      /* Draw the glyph at normal position.  If
                         it sticks out of HIGHEST or LOWEST,
                         update them appropriately.  */
                      if (pcm->ascent > highest)
                        highest = pcm->ascent;
                      else if (- pcm->descent < lowest)
                        lowest = - pcm->descent;
                    }
                }
              else if (s->cmpcharp->cmp_rule)
                {
                  int gref = (s->cmpcharp->cmp_rule[s->gidx] - 0xA0) / 9;
                  int nref = (s->cmpcharp->cmp_rule[s->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;

                  pcm = PER_CHAR_METRIC (s->font, s->char2b + i);
                  bottom = ((gref == 0 ? highest : gref == 1 ? 0
                             : gref == 2 ? lowest
                             : (highest + lowest) / 2)
                            - (nref == 0 ? pcm->ascent + pcm->descent
                               : nref == 1 ? pcm->descent : nref == 2 ? 0
                               : (pcm->ascent + pcm->descent) / 2));
                  top = bottom + (pcm->ascent + pcm->descent);
                  if (top > highest)
                    highest = top;
                  if (bottom < lowest)
                    lowest = bottom;
                  y_offset = bottom + pcm->descent;
                  x_offset = (s->cmpcharp->col_offset[s->gidx]
                              * FONT_WIDTH (FRAME_FONT (s->f)));
                }

              XDrawString16 (s->display, s->window, s->gc,
                             x + x_offset, s->ybase - y_offset,
                             s->char2b + i, 1);
            }
        }
    }
}


/* Allocate the color COLOR->pixel on SCREEN of DISPLAY, colormap
   CMAP.  If an exact match can't be allocated, try the nearest color
   available.  Value is non-zero if successful.  Set *COLOR to the
   color allocated.  */

int
x_alloc_nearest_color (display, screen, cmap, color)
     Display *display;
     Screen *screen;
     Colormap cmap;
     XColor *color;
{
  int rc = XAllocColor (display, cmap, color);
  if (rc == 0)
    {
      /* If we got to this point, the colormap is full, so we're going
         to try to get the next closest color.  The algorithm used is
         a least-squares matching, which is what X uses for closest
         color matching with StaticColor visuals.  */
      int nearest, i;
      unsigned long nearest_delta = ~0;
      int ncells = XDisplayCells (display, XScreenNumberOfScreen (screen));
      XColor *cells = (XColor *) alloca (ncells * sizeof *cells);

      for (i = 0; i < ncells; ++i)
        cells[i].pixel = i;
      XQueryColors (display, cmap, cells, ncells);

      for (nearest = i = 0; i < ncells; ++i)
        {
          long dred   = (color->red   >> 8) - (cells[i].red   >> 8);
          long dgreen = (color->green >> 8) - (cells[i].green >> 8);
          long dblue  = (color->blue  >> 8) - (cells[i].blue  >> 8);
          unsigned long delta = dred * dred + dgreen * dgreen + dblue * dblue;

          if (delta < nearest_delta)
            {
              nearest = i;
              nearest_delta = delta;
            }
        }
      
      color->red   = cells[nearest].red;
      color->green = cells[nearest].green;
      color->blue  = cells[nearest].blue;
      rc = XAllocColor (display, cmap, color);
    }

  return rc;
}


/* Allocate a color which is lighter or darker than *PIXEL by FACTOR
   or DELTA.  Try a color with RGB values multiplied by FACTOR first.
   If this produces the same color as PIXEL, try a color where all RGB
   values have DELTA added.  Return the allocated color in *PIXEL.
   DISPLAY is the X display, CMAP is the colormap to operate on.
   Value is non-zero if successful.  */

static int
x_alloc_lighter_color (f, display, cmap, pixel, factor, delta)
     struct frame *f;
     Display *display;
     Colormap cmap;
     unsigned long *pixel;
     float factor;
     int delta;
{
  XColor color, new;
  int success_p;

  /* Get RGB color values.  */
  color.pixel = *pixel;
  XQueryColor (display, cmap, &color);

  /* Change RGB values by specified FACTOR.  Avoid overflow!  */
  xassert (factor >= 0);
  new.red = min (0xffff, factor * color.red);
  new.green = min (0xffff, factor * color.green);
  new.blue = min (0xffff, factor * color.blue);

  /* Try to allocate the color.  */
  success_p = x_alloc_nearest_color (display, FRAME_X_SCREEN (f), cmap, &new);
  if (success_p)
    {
      if (new.pixel == *pixel)
        {
          /* If we end up with the same color as before, try adding
             delta to the RGB values.  */
          int class = FRAME_X_DISPLAY_INFO (f)->visual->class;
          
          /* If display has an immutable color map, freeing colors is
             not necessary and some servers don't allow it.  So don't
             do it.  */
          if (class != StaticColor
              && class != StaticGray
              && class != TrueColor)
            XFreeColors (display, cmap, &new.pixel, 1, 0);
          
          new.red = min (0xffff, delta + color.red);
          new.green = min (0xffff, delta + color.green);
          new.blue = min (0xffff, delta + color.blue);
          success_p = x_alloc_nearest_color (display, FRAME_X_SCREEN (f),
                                             cmap, &new);
        }
      else
        success_p = 1;
      *pixel = new.pixel;
    }
  
  return success_p;
}


/* Set up the foreground color for drawing relief lines of glyph
   string S.  RELIEF is a pointer to a struct relief containing the GC
   with which lines will be drawn.  Use a color that is FACTOR or
   DELTA lighter or darker than the relief's background which is found
   in S->f->output_data.x->relief_background.  If such a color cannot
   be allocated, use DEFAULT_PIXEL, instead.  */
   
static void
x_setup_relief_color (f, relief, factor, delta, default_pixel)
     struct frame *f;
     struct relief *relief;
     float factor;
     int delta;
     unsigned long default_pixel;
{
  XGCValues xgcv;
  struct x_output *di = f->output_data.x;
  unsigned long mask = GCForeground | GCLineWidth | GCGraphicsExposures;
  unsigned long pixel;
  unsigned long background = di->relief_background;
  Colormap cmap = DefaultColormapOfScreen (FRAME_X_SCREEN (f));

  xgcv.graphics_exposures = False;
  xgcv.line_width = 1;

  /* Free previously allocated color.  The color cell will be reused
     when it has been freed as many times as it was allocated, so this
     doesn't affect faces using the same colors.  */
  if (relief->gc
      && relief->allocated_p)
    {
      /* If display has an immutable color map, freeing colors is not
         necessary and some servers don't allow it.  So don't do it.  */
      int class = FRAME_X_DISPLAY_INFO (f)->visual->class;
      if (class != StaticColor
          && class != StaticGray
          && class != TrueColor)
        XFreeColors (FRAME_X_DISPLAY (f), cmap, &relief->pixel, 1, 0);
      relief->allocated_p = 0;
    }

  /* Allocate new color.  */
  xgcv.foreground = default_pixel;
  pixel = background;
  if (x_alloc_lighter_color (f, FRAME_X_DISPLAY (f), cmap, &pixel,
                             factor, delta))
    {
      relief->allocated_p = 1;
      xgcv.foreground = relief->pixel = pixel;
    }
  
  if (relief->gc == 0)
    {
      xgcv.stipple = FRAME_X_DISPLAY_INFO (f)->gray;
      mask |= GCStipple;
      relief->gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                              mask, &xgcv);
    }
  else
    XChangeGC (FRAME_X_DISPLAY (f), relief->gc, mask, &xgcv);
}


/* Set up colors for the relief lines around glyph string S.  */

static void
x_setup_relief_colors (s)
     struct glyph_string *s;
{
  struct x_output *di = s->f->output_data.x;
  unsigned long color;

  if (s->face->use_box_color_for_shadows_p)
    color = s->face->box_color;
  else
    {
      XGCValues xgcv;
      
      /* Get the background color of the face.  */
      XGetGCValues (s->display, s->gc, GCBackground, &xgcv);
      color = xgcv.background;
    }

  if (di->white_relief.gc == 0
      || color != di->relief_background)
    {
      di->relief_background = color;
      x_setup_relief_color (s->f, &di->white_relief, 1.2, 0x8000,
                            WHITE_PIX_DEFAULT (s->f));
      x_setup_relief_color (s->f, &di->black_relief, 0.6, 0x4000,
                            BLACK_PIX_DEFAULT (s->f));
    }
}


/* Draw a relief on frame F inside the rectangle given by LEFT_X,
   TOP_Y, RIGHT_X, and BOTTOM_Y.  WIDTH is the thickness of the relief
   to draw, it must be >= 0.  RAISED_P non-zero means draw a raised
   relief.  LEFT_P non-zero means draw a relief on the left side of
   the rectangle.  RIGHT_P non-zero means draw a relief on the right
   side of the rectangle.  CLIP_RECT is the clipping rectangle to use
   when drawing.  */

static void
x_draw_relief_rect (f, left_x, top_y, right_x, bottom_y, width,
                    raised_p, left_p, right_p, clip_rect)
     struct frame *f;
     int left_x, top_y, right_x, bottom_y, left_p, right_p, raised_p;
     XRectangle *clip_rect;
{
  int i;
  GC gc;
  
  if (raised_p)
    gc = f->output_data.x->white_relief.gc;
  else
    gc = f->output_data.x->black_relief.gc;
  XSetClipRectangles (FRAME_X_DISPLAY (f), gc, 0, 0, clip_rect, 1, Unsorted);

  /* Top.  */
  for (i = 0; i < width; ++i)
    XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
               left_x + i * left_p, top_y + i,
               right_x + 1 - i * right_p, top_y + i);

  /* Left.  */
  if (left_p)
    for (i = 0; i < width; ++i)
      XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                 left_x + i, top_y + i, left_x + i, bottom_y - i);

  XSetClipMask (FRAME_X_DISPLAY (f), gc, None);
  if (raised_p)
    gc = f->output_data.x->black_relief.gc;
  else
    gc = f->output_data.x->white_relief.gc;
  XSetClipRectangles (FRAME_X_DISPLAY (f), gc, 0, 0, clip_rect, 1, Unsorted);
  
  /* Bottom.  */
  for (i = 0; i < width; ++i)
    XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
               left_x + i * left_p, bottom_y - i,
               right_x + 1 - i * right_p, bottom_y - i);
  
  /* Right.  */
  if (right_p)
    for (i = 0; i < width; ++i)
      XDrawLine (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                 right_x - i, top_y + i + 1, right_x - i, bottom_y - i);

  XSetClipMask (FRAME_X_DISPLAY (f), gc, None);
}


/* Draw a box on frame F inside the rectangle given by LEFT_X, TOP_Y,
   RIGHT_X, and BOTTOM_Y.  WIDTH is the thickness of the lines to
   draw, it must be >= 0.  LEFT_P non-zero means draw a line on the
   left side of the rectangle.  RIGHT_P non-zero means draw a line
   on the right side of the rectangle.  CLIP_RECT is the clipping
   rectangle to use when drawing.  */

static void
x_draw_box_rect (s, left_x, top_y, right_x, bottom_y, width,
                 left_p, right_p, clip_rect)
     struct glyph_string *s;
     int left_x, top_y, right_x, bottom_y, left_p, right_p;
     XRectangle *clip_rect;
{
  XGCValues xgcv;
  
  XGetGCValues (s->display, s->gc, GCForeground, &xgcv);
  XSetForeground (s->display, s->gc, s->face->box_color);
  XSetClipRectangles (s->display, s->gc, 0, 0, clip_rect, 1, Unsorted);
  
  /* Top.  */
  XFillRectangle (s->display, s->window, s->gc,
                  left_x, top_y, right_x - left_x, width);

  /* Left.  */
  if (left_p)
    XFillRectangle (s->display, s->window, s->gc,
                    left_x, top_y, width, bottom_y - top_y);

  /* Bottom.  */
  XFillRectangle (s->display, s->window, s->gc,
                  left_x, bottom_y - width, right_x - left_x, width);
  
  /* Right.  */
  if (right_p)
    XFillRectangle (s->display, s->window, s->gc,
                    right_x - width, top_y, width, bottom_y - top_y);

  XSetForeground (s->display, s->gc, xgcv.foreground);
  XSetClipMask (s->display, s->gc, None);
}


/* Draw a box around glyph string S.  */

static void
x_draw_glyph_string_box (s)
     struct glyph_string *s;
{
  int width, left_x, right_x, top_y, bottom_y, last_x, raised_p;
  int left_p, right_p;
  struct glyph *last_glyph;
  XRectangle clip_rect;

  last_x = window_box_right (s->w, s->area);
  if (s->row->full_width_p
      && !s->w->pseudo_window_p)
    {
      last_x += FRAME_X_FLAGS_AREA_WIDTH (s->f);
      if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_RIGHT (s->f))
        last_x += FRAME_SCROLL_BAR_WIDTH (s->f) * CANON_X_UNIT (s->f);
    }
  
  /* The glyph that may have a right box line.  */
  last_glyph = (s->cmpcharp || s->img
                ? s->first_glyph
                : s->first_glyph + s->nchars - 1);

  width = s->face->box_line_width;
  raised_p = s->face->box == FACE_RAISED_BOX;
  left_x = s->x;
  right_x = ((s->row->full_width_p
              ? last_x
              : min (last_x, s->x + s->width) - 1));
  top_y = s->y;
  bottom_y = top_y + s->height - 1;

  left_p = (s->first_glyph->left_box_line_p
            || (s->hl == DRAW_MOUSE_FACE
                && (s->prev == NULL
                    || s->prev->hl != s->hl)));
  right_p = (last_glyph->right_box_line_p
             || (s->hl == DRAW_MOUSE_FACE
                 && (s->next == NULL
                     || s->next->hl != s->hl)));
  
  x_get_glyph_string_clip_rect (s, &clip_rect);

  if (s->face->box == FACE_SIMPLE_BOX)
    x_draw_box_rect (s, left_x, top_y, right_x, bottom_y, width,
                     left_p, right_p, &clip_rect);
  else
    {
      x_setup_relief_colors (s);
      x_draw_relief_rect (s->f, left_x, top_y, right_x, bottom_y,
                          width, raised_p, left_p, right_p, &clip_rect);
    }
}


/* Draw foreground of image glyph string S.  */

static void
x_draw_image_foreground (s)
     struct glyph_string *s;
{
  int x;
  int y = s->ybase - IMAGE_ASCENT (s->img);

  /* If first glyph of S has a left box line, start drawing it to the
     right of that line.  */
  if (s->face->box != FACE_NO_BOX
      && s->first_glyph->left_box_line_p)
    x = s->x + s->face->box_line_width;
  else
    x = s->x;

  /* If there is a margin around the image, adjust x- and y-position
     by that margin.  */
  if (s->img->margin)
    {
      x += s->img->margin;
      y += s->img->margin;
    }

  if (s->img->pixmap)
    {
      if (s->img->mask)
        {
          /* We can't set both a clip mask and use XSetClipRectangles
             because the latter also sets a clip mask.  We also can't
             trust on the shape extension to be available
             (XShapeCombineRegion).  So, compute the rectangle to draw
             manually.  */
          unsigned long mask = (GCClipMask | GCClipXOrigin | GCClipYOrigin
                                | GCFunction);
          XGCValues xgcv;
          XRectangle clip_rect, image_rect, r;

          xgcv.clip_mask = s->img->mask;
          xgcv.clip_x_origin = x;
          xgcv.clip_y_origin = y;
          xgcv.function = GXcopy;
          XChangeGC (s->display, s->gc, mask, &xgcv);
          
          x_get_glyph_string_clip_rect (s, &clip_rect);
          image_rect.x = x;
          image_rect.y = y;
          image_rect.width = s->img->width;
          image_rect.height = s->img->height;
          if (x_intersect_rectangles (&clip_rect, &image_rect, &r))
            XCopyArea (s->display, s->img->pixmap, s->window, s->gc,
                       r.x - x, r.y - y, r.width, r.height, r.x, r.y);
        }
      else
        {
          XCopyArea (s->display, s->img->pixmap, s->window, s->gc,
                     0, 0, s->img->width, s->img->height, x, y);
          
          /* When the image has a mask, we can expect that at
             least part of a mouse highlight or a block cursor will
             be visible.  If the image doesn't have a mask, make
             a block cursor visible by drawing a rectangle around
             the image.  I believe it's looking better if we do
             nothing here for mouse-face.  */
          if (s->hl == DRAW_CURSOR)
            XDrawRectangle (s->display, s->window, s->gc, x, y,
                            s->img->width - 1, s->img->height - 1);
        }
    }
  else
    /* Draw a rectangle if image could not be loaded.  */
    XDrawRectangle (s->display, s->window, s->gc, x, y,
                    s->img->width - 1, s->img->height - 1);
}


/* Draw a relief around the image glyph string S.  */

static void
x_draw_image_relief (s)
     struct glyph_string *s;
{
  int x0, y0, x1, y1, thick, raised_p;
  XRectangle r;
  int x;
  int y = s->ybase - IMAGE_ASCENT (s->img);
  
  /* If first glyph of S has a left box line, start drawing it to the
     right of that line.  */
  if (s->face->box != FACE_NO_BOX
      && s->first_glyph->left_box_line_p)
    x = s->x + s->face->box_line_width;
  else
    x = s->x;
  
  /* If there is a margin around the image, adjust x- and y-position
     by that margin.  */
  if (s->img->margin)
    {
      x += s->img->margin;
      y += s->img->margin;
    }
  
  if (s->hl == DRAW_IMAGE_SUNKEN
      || s->hl == DRAW_IMAGE_RAISED)
    {
      thick = toolbar_button_relief > 0 ? toolbar_button_relief : 3;
      raised_p = s->hl == DRAW_IMAGE_RAISED;
    }
  else
    {
      thick = abs (s->img->relief);
      raised_p = s->img->relief > 0;
    }
  
  x0 = x - thick;
  y0 = y - thick;
  x1 = x + s->img->width + thick - 1;
  y1 = y + s->img->height + thick - 1;
  
  x_setup_relief_colors (s);
  x_get_glyph_string_clip_rect (s, &r);
  x_draw_relief_rect (s->f, x0, y0, x1, y1, thick, raised_p, 1, 1, &r);
}


/* Draw the foreground of image glyph string S to PIXMAP.  */

static void
x_draw_image_foreground_1 (s, pixmap)
     struct glyph_string *s;
     Pixmap pixmap;
{
  int x;
  int y = s->ybase - s->y - IMAGE_ASCENT (s->img);

  /* If first glyph of S has a left box line, start drawing it to the
     right of that line.  */
  if (s->face->box != FACE_NO_BOX
      && s->first_glyph->left_box_line_p)
    x = s->face->box_line_width;
  else
    x = 0;

  /* If there is a margin around the image, adjust x- and y-position
     by that margin.  */
  if (s->img->margin)
    {
      x += s->img->margin;
      y += s->img->margin;
    }

  if (s->img->pixmap)
    {
      if (s->img->mask)
        {
          /* We can't set both a clip mask and use XSetClipRectangles
             because the latter also sets a clip mask.  We also can't
             trust on the shape extension to be available
             (XShapeCombineRegion).  So, compute the rectangle to draw
             manually.  */
          unsigned long mask = (GCClipMask | GCClipXOrigin | GCClipYOrigin
                                | GCFunction);
          XGCValues xgcv;

          xgcv.clip_mask = s->img->mask;
          xgcv.clip_x_origin = x;
          xgcv.clip_y_origin = y;
          xgcv.function = GXcopy;
          XChangeGC (s->display, s->gc, mask, &xgcv);

          XCopyArea (s->display, s->img->pixmap, pixmap, s->gc,
                     0, 0, s->img->width, s->img->height, x, y);
          XSetClipMask (s->display, s->gc, None);
        }
      else
        {
          XCopyArea (s->display, s->img->pixmap, pixmap, s->gc,
                     0, 0, s->img->width, s->img->height, x, y);
          
          /* When the image has a mask, we can expect that at
             least part of a mouse highlight or a block cursor will
             be visible.  If the image doesn't have a mask, make
             a block cursor visible by drawing a rectangle around
             the image.  I believe it's looking better if we do
             nothing here for mouse-face.  */
          if (s->hl == DRAW_CURSOR)
            XDrawRectangle (s->display, pixmap, s->gc, x, y,
                            s->img->width - 1, s->img->height - 1);
        }
    }
  else
    /* Draw a rectangle if image could not be loaded.  */
    XDrawRectangle (s->display, pixmap, s->gc, x, y,
                    s->img->width - 1, s->img->height - 1);
}


/* Draw part of the background of glyph string S.  X, Y, W, and H
   give the rectangle to draw.  */

static void
x_draw_glyph_string_bg_rect (s, x, y, w, h)
     struct glyph_string *s;
     int x, y, w, h;
{
  if (s->stippled_p)
    {
      /* Fill background with a stipple pattern.  */
      XSetFillStyle (s->display, s->gc, FillOpaqueStippled);
      XFillRectangle (s->display, s->window, s->gc, x, y, w, h);
      XSetFillStyle (s->display, s->gc, FillSolid);
    }
  else
    x_clear_glyph_string_rect (s, x, y, w, h);
}


/* Draw image glyph string S.  

            s->y
   s->x      +-------------------------
             |   s->face->box
             |
             |     +-------------------------
             |     |  s->img->margin
             |     |
             |     |       +-------------------
             |     |       |  the image

 */

static void
x_draw_image_glyph_string (s)
     struct glyph_string *s;
{
  int x, y;
  int box_line_width = s->face->box_line_width;
  int margin = s->img->margin;
  int height;
  Pixmap pixmap = None;

  height = s->height - 2 * box_line_width;

  /* Fill background with face under the image.  Do it only if row is
     taller than image or if image has a clip mask to reduce
     flickering.  */
  s->stippled_p = s->face->stipple != 0;
  if (height > s->img->height
      || margin
      || s->img->mask
      || s->img->pixmap == 0
      || s->width != s->background_width)
    {
      if (box_line_width && s->first_glyph->left_box_line_p)
        x = s->x + box_line_width;
      else
        x = s->x;
      
      y = s->y + box_line_width;
      
      if (s->img->mask)
        {
          /* Create a pixmap as large as the glyph string Fill it with
             the background color.  Copy the image to it, using its
             mask.  Copy the temporary pixmap to the display.  */
          Screen *screen = FRAME_X_SCREEN (s->f);
          int depth = DefaultDepthOfScreen (screen);

          /* Create a pixmap as large as the glyph string.  */
          pixmap = XCreatePixmap (s->display, s->window,
                                  s->background_width,
                                  s->height, depth);
          
          /* Don't clip in the following because we're working on the
             pixmap.  */
          XSetClipMask (s->display, s->gc, None);

          /* Fill the pixmap with the background color/stipple.  */
          if (s->stippled_p)
            {
              /* Fill background with a stipple pattern.  */
              XSetFillStyle (s->display, s->gc, FillOpaqueStippled);
              XFillRectangle (s->display, pixmap, s->gc,
                              0, 0, s->background_width, s->height);
              XSetFillStyle (s->display, s->gc, FillSolid);
            }
          else
            {
              XGCValues xgcv;
              XGetGCValues (s->display, s->gc, GCForeground | GCBackground,
                            &xgcv);
              XSetForeground (s->display, s->gc, xgcv.background);
              XFillRectangle (s->display, pixmap, s->gc,
                              0, 0, s->background_width, s->height);
              XSetForeground (s->display, s->gc, xgcv.foreground);
            }
        }
      else
        /* Implementation idea: Is it possible to construct a mask?
           We could look at the color at the margins of the image, and
           say that this color is probably the background color of the
           image.  */
        x_draw_glyph_string_bg_rect (s, x, y, s->background_width, height);
      
      s->background_filled_p = 1;
    }

  /* Draw the foreground.  */
  if (pixmap != None)
    {
      x_draw_image_foreground_1 (s, pixmap);
      x_set_glyph_string_clipping (s);
      XCopyArea (s->display, pixmap, s->window, s->gc,
                 0, 0, s->background_width, s->height, s->x, s->y);
      XFreePixmap (s->display, pixmap);
    }
  else
    x_draw_image_foreground (s);

  /* If we must draw a relief around the image, do it.  */
  if (s->img->relief
      || s->hl == DRAW_IMAGE_RAISED
      || s->hl == DRAW_IMAGE_SUNKEN)
    x_draw_image_relief (s);
}


/* Draw stretch glyph string S.  */

static void
x_draw_stretch_glyph_string (s)
     struct glyph_string *s;
{
  xassert (s->first_glyph->type == STRETCH_GLYPH);
  s->stippled_p = s->face->stipple != 0;

  if (s->hl == DRAW_CURSOR
      && !x_stretch_cursor_p)
    {
      /* If `x-stretch-block-cursor' is nil, don't draw a block cursor
         as wide as the stretch glyph.  */
      int width = min (CANON_X_UNIT (s->f), s->background_width);

      /* Draw cursor.  */
      x_draw_glyph_string_bg_rect (s, s->x, s->y, width, s->height);

      /* Clear rest using the GC of the original non-cursor face.  */
      if (width < s->background_width)
        {
          GC gc = s->face->gc;
          int x = s->x + width, y = s->y;
          int w = s->background_width - width, h = s->height;
          XRectangle r;

          x_get_glyph_string_clip_rect (s, &r);
          XSetClipRectangles (s->display, gc, 0, 0, &r, 1, Unsorted);

          if (s->face->stipple)
            {
              /* Fill background with a stipple pattern.  */
              XSetFillStyle (s->display, gc, FillOpaqueStippled);
              XFillRectangle (s->display, s->window, gc, x, y, w, h);
              XSetFillStyle (s->display, gc, FillSolid);
            }
          else
            {
              XGCValues xgcv;
              XGetGCValues (s->display, gc, GCForeground | GCBackground, &xgcv);
              XSetForeground (s->display, gc, xgcv.background);
              XFillRectangle (s->display, s->window, gc, x, y, w, h);
              XSetForeground (s->display, gc, xgcv.foreground);
            }
        }
    }
  else
    x_draw_glyph_string_bg_rect (s, s->x, s->y, s->background_width,
                                 s->height);
  
  s->background_filled_p = 1;
}


/* Draw glyph string S.  */

static void
x_draw_glyph_string (s)
     struct glyph_string *s;
{
  /* If S draws into the background of its successor, draw the
     background of the successor first so that S can draw into it.
     This makes S->next use XDrawString instead of XDrawImageString.  */
  if (s->next && s->right_overhang)
    {
      xassert (s->next->img == NULL);
      x_set_glyph_string_gc (s->next);
      x_set_glyph_string_clipping (s->next);
      x_draw_glyph_string_background (s->next, 1);
    }

  /* Set up S->gc, set clipping and draw S.  */
  x_set_glyph_string_gc (s);
  x_set_glyph_string_clipping (s);

  switch (s->first_glyph->type)
    {
    case IMAGE_GLYPH:
      x_draw_image_glyph_string (s);
      break;

    case STRETCH_GLYPH:
      x_draw_stretch_glyph_string (s);
      break;

    case CHAR_GLYPH:
      x_draw_glyph_string_background (s, 0);
      x_draw_glyph_string_foreground (s);
      break;

    default:
      abort ();
    }

  /* Draw underline.  */
  if (s->face->underline_p)
    {
      unsigned long dy, h;

      if (!XGetFontProperty (s->font, XA_UNDERLINE_THICKNESS, &h))
        h = 1;
      if (!XGetFontProperty (s->font, XA_UNDERLINE_POSITION, &dy))
        dy = s->height - h;
      
      if (s->face->underline_defaulted_p)
        XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                        s->width, h);
      else
        {
          XGCValues xgcv;
          XGetGCValues (s->display, s->gc, GCForeground, &xgcv);
          XSetForeground (s->display, s->gc, s->face->underline_color);
          XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                          s->width, h);
          XSetForeground (s->display, s->gc, xgcv.foreground);
        }
    }

  /* Draw overline.  */
  if (s->face->overline_p)
    {
      unsigned long dy = 0, h = 1;

      if (s->face->overline_color_defaulted_p)
        XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                        s->width, h);
      else
        {
          XGCValues xgcv;
          XGetGCValues (s->display, s->gc, GCForeground, &xgcv);
          XSetForeground (s->display, s->gc, s->face->overline_color);
          XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                          s->width, h);
          XSetForeground (s->display, s->gc, xgcv.foreground);
        }
    }
  
  /* Draw strike-through.  */
  if (s->face->strike_through_p)
    {
      unsigned long h = 1;
      unsigned long dy = (s->height - h) / 2;

      if (s->face->strike_through_color_defaulted_p)
        XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                        s->width, h);
      else
        {
          XGCValues xgcv;
          XGetGCValues (s->display, s->gc, GCForeground, &xgcv);
          XSetForeground (s->display, s->gc, s->face->strike_through_color);
          XFillRectangle (s->display, s->window, s->gc, s->x, s->y + dy,
                          s->width, h);
          XSetForeground (s->display, s->gc, xgcv.foreground);
        }
    }
  
  /* Draw relief.  */
  if (s->face->box != FACE_NO_BOX)
    x_draw_glyph_string_box (s);
  
  /* Reset clipping.  */
  XSetClipMask (s->display, s->gc, None);
}


/* A work-list entry used during the construction of glyph_string
   structures for a composite character.  */

struct work
{
  /* Pointer to composite char info defining has the composite
     character is drawn.  */
  struct cmpchar_info *cmpcharp;

  /* Start index in compcharp->glyph[].  */
  int gidx;

  /* Next in stack.  */
  struct work *next;
};


static void x_fill_composite_glyph_string P_ ((struct glyph_string *,
                                               int, struct work **,
                                               struct work **));


/* Load glyph string S with information from the top of *STACK for a
   composite character.  FACE_ID is the id of the face in which S is
   drawn.  *NEW is a pointer to a struct work not on the stack, that
   can be used if this function needs to push a new structure on the
   stack.  If it uses it, *NEW is set to null.  */

static void
x_fill_composite_glyph_string (s, face_id, stack, new)
     struct glyph_string *s;
     int face_id;
     struct work **stack, **new;
{
  int i, c;
  struct work *work;

  xassert (s && *new && *stack);

  /* Pop the work stack.  */
  work = *stack;
  *stack = work->next;
  
  /* For all glyphs of cmpcharp->glyph, starting at the offset
     work->offset, until we reach the end of the definition or
     encounter another composite char, get the font and face to use,
     and add it to S.  */
  for (i = work->gidx; i < work->cmpcharp->glyph_len; ++i)
    {
      c = FAST_GLYPH_CHAR (work->cmpcharp->glyph[i]);
      if (CHAR_CHARSET (c) == CHARSET_COMPOSITION)
        break;
      s->face = x_get_char_face_and_encoding (s->f, c, face_id,
                                              s->char2b + s->nchars, 1);
      s->font = s->face->font;
      s->font_info = FONT_INFO_FROM_ID (s->f, s->face->font_info_id);
      ++s->nchars;
    }

  /* If we find another composite char in the glyph definition of
     work->cmpcharp, put back the rest of the glyphs on the work
     stack, and make a new entry for the composite char.  */
  if (i < work->cmpcharp->glyph_len)
    {
      /* Push back an unprocessed rest of this glyph spec.  */
      if (i < work->cmpcharp->glyph_len - 1)
        {
          work->gidx = i + 1;
          work->next = *stack;
          *stack = work;
          work = *new;
          *new = NULL;
        }

      /* Make an entry for the composite char on the work stack.  */
      work->cmpcharp = cmpchar_table[COMPOSITE_CHAR_ID (c)];
      work->gidx = 0;
      work->next = *stack;
      *stack = work;
    }

  /* The width of this glyph string equals the width of the first
     glyph.  All characters are drawn at the same x-position.  */
  s->width = s->first_glyph->pixel_width;

  /* If the specified font could not be loaded, use the frame's
     default font, but record the fact that we couldn't load it in
     the glyph string so that we can draw rectangles for the
     characters of the glyph string.  */
  if (s->font == NULL)
    {
      s->font_not_found_p = 1;
      s->font = FRAME_FONT (s->f);
    }

  /* Adjust base line for subscript/superscript text.  */
  s->ybase += s->first_glyph->voffset;
  
  xassert (s->face && s->face->gc);

  /* This glyph string must always be drawn with 16-bit functions.  */
  s->two_byte_p = 1;
}


/* Load glyph string S with a sequence of non-composite characters.
   FACE_ID is the face id of the string.  START is the index of the
   first glyph to consider, END is the index of the last + 1.  Value
   is the index of the first glyph not in S.  */

static int
x_fill_glyph_string (s, face_id, start, end)
     struct glyph_string *s;
     int face_id;
     int start, end;
{
  struct glyph *glyph, *last;
  int voffset;
  
  xassert (s->charset != CHARSET_COMPOSITION);
  xassert (s->f == XFRAME (s->w->frame));
  xassert (s->nchars == 0);
  xassert (start >= 0 && end > start);

  glyph = s->row->glyphs[s->area] + start;
  last = s->row->glyphs[s->area] + end;
  voffset = glyph->voffset;
  
  while (glyph < last
         && glyph->type == CHAR_GLYPH
         && glyph->voffset == voffset
         /* Same face id implies same charset, nowadays.  */
         && glyph->u.ch.face_id == face_id)
    {
      s->face = x_get_glyph_face_and_encoding (s->f, glyph,
                                               s->char2b + s->nchars);
      if (s->char2b[s->nchars].byte2 != 0)
        s->two_byte_p = 1;
      
      ++s->nchars;
      xassert (s->nchars <= end - start);
      s->width += glyph->pixel_width;
      ++glyph;
    }

  s->font = s->face->font;
  s->font_info = FONT_INFO_FROM_ID (s->f, s->face->font_info_id);
  
  /* If the specified font could not be loaded, use the frame's font,
     but record the fact that we couldn't load it in
     S->font_not_found_p so that we can draw rectangles for the
     characters of the glyph string.  */
  if (s->font == NULL)
    {
      s->font_not_found_p = 1;
      s->font = FRAME_FONT (s->f);
    }

  /* Adjust base line for subscript/superscript text.  */
  s->ybase += voffset;
  
  xassert (s->face && s->face->gc);
  return glyph - s->row->glyphs[s->area];
}


/* Fill glyph string S from image glyph S->first_glyph.  */

static void
x_fill_image_glyph_string (s)
     struct glyph_string *s;
{
  xassert (s->first_glyph->type == IMAGE_GLYPH);
  s->img = IMAGE_FROM_ID (s->f, s->first_glyph->u.img.id);
  xassert (s->img);
  s->face = FACE_FROM_ID (s->f, s->first_glyph->u.img.face_id);
  s->font = s->face->font;
  s->width = s->first_glyph->pixel_width;
  
  /* Adjust base line for subscript/superscript text.  */
  s->ybase += s->first_glyph->voffset;
}


/* Fill glyph string S from stretch glyph S->first_glyph.  */

static void
x_fill_stretch_glyph_string (s)
     struct glyph_string *s;
{
  xassert (s->first_glyph->type == STRETCH_GLYPH);
  s->face = FACE_FROM_ID (s->f, s->first_glyph->u.stretch.face_id);
  s->font = s->face->font;
  s->width = s->first_glyph->pixel_width;
  
  /* Adjust base line for subscript/superscript text.  */
  s->ybase += s->first_glyph->voffset;
}


/* Initialize glyph string S.  CHAR2B is a suitably allocated vector
   of XChar2b structures for S; it can't be allocated in
   x_init_glyph_string because it must be allocated via `alloca'.  W
   is the window on which S is drawn.  ROW and AREA are the glyph row
   and area within the row from which S is constructed.  START is the
   index of the first glyph structure covered by S.  HL is a
   face-override for drawing S.  */
   
static void
x_init_glyph_string (s, char2b, w, row, area, start, hl)
     struct glyph_string *s;
     XChar2b *char2b;
     struct window *w;
     struct glyph_row *row;
     enum glyph_row_area area;
     int start;
     enum draw_glyphs_face hl;
{
  bzero (s, sizeof *s);
  s->w = w;
  s->f = XFRAME (w->frame);
  s->display = FRAME_X_DISPLAY (s->f);
  s->window = FRAME_X_WINDOW (s->f);
  s->char2b = char2b;
  s->hl = hl;
  s->row = row;
  s->area = area;
  s->first_glyph = row->glyphs[area] + start;
  s->height = row->height;
  s->y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);

  /* Display the internal border below the toolbar window.  */
  if (s->w == XWINDOW (s->f->toolbar_window))
    s->y -= s->f->output_data.x->internal_border_width;
  
  s->ybase = s->y + row->ascent;
}


/* Set background width of glyph string S.  START is the index of the
   first glyph following S.  LAST_X is the right-most x-position + 1
   in the drawing area.  */

static INLINE void
x_set_glyph_string_background_width (s, start, last_x)
     struct glyph_string *s;
     int start;
     int last_x;
{
  /* If the face of this glyph string has to be drawn to the end of
     the drawing area, set S->extends_to_end_of_line_p.  */
  struct face *default_face = FACE_FROM_ID (s->f, DEFAULT_FACE_ID);
  
  if (start == s->row->used[s->area]
      && s->hl == DRAW_NORMAL_TEXT
      && ((s->area == TEXT_AREA && s->row->fill_line_p)
          || s->face->background != default_face->background
          || s->face->stipple != default_face->stipple))
    s->extends_to_end_of_line_p = 1;
  
  /* If S extends its face to the end of the line, set its
     background_width to the distance to the right edge of the drawing
     area.  */
  if (s->extends_to_end_of_line_p)
    s->background_width = last_x - s->x;
  else
    s->background_width = s->width;
}


/* Add a glyph string for a stretch glyph to the list of strings
   between HEAD and TAIL.  START is the index of the stretch glyph in
   row area AREA of glyph row ROW.  END is the index of the last glyph
   in that glyph row area.  X is the current output position assigned
   to the new glyph string constructed.  HL overrides that face of the
   glyph; e.g. it is DRAW_CURSOR if a cursor has to be drawn.  LAST_X
   is the right-most x-position of the drawing area.  */

#define BUILD_STRETCH_GLYPH_STRING(W, ROW, AREA, START, END, HEAD, TAIL,    \
                                 HL, X, LAST_X)                             \
     do                                                                     \
       {                                                                    \
         s = (struct glyph_string *) alloca (sizeof *s);                    \
         x_init_glyph_string (s, NULL, W, ROW, AREA, START, HL);            \
         x_fill_stretch_glyph_string (s);                                   \
         x_append_glyph_string (&HEAD, &TAIL, s);                           \
         ++START;                                                           \
         s->x = (X);                                                        \
       }                                                                    \
     while (0)


/* Add a glyph string for an image glyph to the list of strings
   between HEAD and TAIL.  START is the index of the image glyph in
   row area AREA of glyph row ROW.  END is the index of the last glyph
   in that glyph row area.  X is the current output position assigned
   to the new glyph string constructed.  HL overrides that face of the
   glyph; e.g. it is DRAW_CURSOR if a cursor has to be drawn.  LAST_X
   is the right-most x-position of the drawing area.  */

#define BUILD_IMAGE_GLYPH_STRING(W, ROW, AREA, START, END, HEAD, TAIL,  \
                                 HL, X, LAST_X)                         \
     do                                                                 \
       {                                                                \
         s = (struct glyph_string *) alloca (sizeof *s);                \
         x_init_glyph_string (s, NULL, W, ROW, AREA, START, HL);        \
         x_fill_image_glyph_string (s);                                 \
         x_append_glyph_string (&HEAD, &TAIL, s);                       \
         ++START;                                                       \
         s->x = (X);                                                    \
       }                                                                \
     while (0)


/* Add a glyph string for a sequence of character glyphs to the list
   of strings between HEAD and TAIL.  START is the index of the first
   glyph in row area AREA of glyph row ROW that is part of the new
   glyph string.  END is the index of the last glyph in that glyph row
   area.  X is the current output position assigned to the new glyph
   string constructed.  HL overrides that face of the glyph; e.g. it
   is DRAW_CURSOR if a cursor has to be drawn.  LAST_X is the
   right-most x-position of the drawing area.  */

#define BUILD_CHAR_GLYPH_STRINGS(W, ROW, AREA, START, END, HEAD, TAIL, HL, \
                                 X, LAST_X)                                \
     do                                                                    \
       {                                                                   \
         int c, charset, face_id;                                          \
         XChar2b *char2b;                                                  \
                                                                           \
         c = (ROW)->glyphs[AREA][START].u.ch.code;                         \
         charset = CHAR_CHARSET (c);                                       \
         face_id = (ROW)->glyphs[AREA][START].u.ch.face_id;                \
                                                                           \
         if (charset == CHARSET_COMPOSITION)                               \
           {                                                               \
             struct work *stack, *work, *new = NULL;                       \
             int n = 0;                                                    \
             struct glyph_string *first_s = NULL;                          \
                                                                           \
             /* Push an initial entry for character c on the stack.  */    \
             stack = NULL;                                                 \
             work = (struct work *) alloca (sizeof *work);                 \
             work->cmpcharp = cmpchar_table[COMPOSITE_CHAR_ID (c)];        \
             work->gidx = 0;                                               \
             work->next = stack;                                           \
             stack = work;                                                 \
                                                                           \
             /* While the stack is not empty, append glyph_strings         \
                to head/tail for glyphs to draw.  */                       \
             while (stack)                                                 \
               {                                                           \
                 s = (struct glyph_string *) alloca (sizeof *s);           \
                 char2b = (XChar2b *) alloca (stack->cmpcharp->glyph_len   \
                                              * sizeof (XChar2b));         \
                 x_init_glyph_string (s, char2b, W, ROW, AREA, START, HL); \
                 x_append_glyph_string (&(HEAD), &(TAIL), s);              \
                 s->cmpcharp = stack->cmpcharp;                            \
                 s->gidx = stack->gidx;                                    \
                 s->charset = charset;                                     \
                 s->x = (X);                                               \
                                                                           \
                 if (n == 0)                                               \
                   {                                                       \
                     /* Don't draw the background except for the           \
                        first glyph string.  */                            \
                     s->background_filled_p = n > 0;                       \
                     first_s = s;                                          \
                   }                                                       \
                 ++n;                                                      \
                                                                           \
                 if (new == NULL)                                          \
                   new = (struct work *) alloca (sizeof *new);             \
                 x_fill_composite_glyph_string (s, face_id, &stack,        \
                                                &new);                     \
               }                                                           \
                                                                           \
             ++START;                                                      \
             s = first_s;                                                  \
           }                                                               \
         else                                                              \
           {                                                               \
             s = (struct glyph_string *) alloca (sizeof *s);               \
             char2b = (XChar2b *) alloca ((END - START) * sizeof *char2b); \
             x_init_glyph_string (s, char2b, W, ROW, AREA, START, HL);     \
             x_append_glyph_string (&HEAD, &TAIL, s);                      \
             s->charset = charset;                                         \
             s->x = (X);                                                   \
             START = x_fill_glyph_string (s, face_id, START, END);         \
           }                                                               \
       }                                                                   \
     while (0)
     

/* Build a list of glyph strings between HEAD and TAIL for the glyphs
   of AREA of glyph row ROW on window W between indices START and END.
   HL overrides the face for drawing glyph strings, e.g. it is
   DRAW_CURSOR to draw a cursor.  X and LAST_X are start and end
   x-positions of the drawing area.

   This is an ugly monster macro construct because we must use alloca
   to allocate glyph strings (because x_draw_glyphs can be called
   asynchronously).  */

#define BUILD_GLYPH_STRINGS(W, ROW, AREA, START, END, HEAD, TAIL, HL,      \
                            X, LAST_X)                                     \
     do                                                                    \
       {                                                                   \
         HEAD = TAIL = NULL;                                               \
         while (START < END)                                               \
           {                                                               \
             struct glyph *first_glyph = (ROW)->glyphs[AREA] + START;      \
             switch (first_glyph->type)                                    \
               {                                                           \
               case CHAR_GLYPH:                                            \
                 BUILD_CHAR_GLYPH_STRINGS (W, ROW, AREA, START, END, HEAD, \
                                           TAIL, HL, X, LAST_X);           \
                 break;                                                    \
                                                                           \
               case STRETCH_GLYPH:                                         \
                 BUILD_STRETCH_GLYPH_STRING (W, ROW, AREA, START, END,     \
                                             HEAD, TAIL, HL, X, LAST_X);   \
                 break;                                                    \
                                                                           \
               case IMAGE_GLYPH:                                           \
                 BUILD_IMAGE_GLYPH_STRING (W, ROW, AREA, START, END, HEAD, \
                                           TAIL, HL, X, LAST_X);           \
                 break;                                                    \
                                                                           \
               default:                                                    \
                 abort ();                                                 \
               }                                                           \
                                                                           \
             x_set_glyph_string_background_width (s, START, LAST_X);       \
             (X) += s->width;                                              \
            }                                                              \
       }                                                                   \
     while (0)


/* Draw glyphs between START and END in AREA of ROW on window W,
   starting at x-position X.  X is relative to AREA in W.  HL is a
   face-override with the following meaning:

   DRAW_NORMAL_TEXT     draw normally
   DRAW_CURSOR          draw in cursor face
   DRAW_MOUSE_FACE      draw in mouse face.
   DRAW_INVERSE_VIDEO   draw in mode line face
   DRAW_IMAGE_SUNKEN    draw an image with a sunken relief around it
   DRAW_IMAGE_RAISED    draw an image with a raised relief around it

   If REAL_START is non-null, return in *REAL_START the real starting
   position for display.  This can be different from START in case
   overlapping glyphs must be displayed.  If REAL_END is non-null,
   return in *REAL_END the real end position for display.  This can be
   different from END in case overlapping glyphs must be displayed.

   Value is the x-position reached, relative to AREA of W.  */
     
static int
x_draw_glyphs (w, x, row, area, start, end, hl, real_start, real_end)
     struct window *w;
     int x;
     struct glyph_row *row;
     enum glyph_row_area area;
     int start, end;
     enum draw_glyphs_face hl;
     int *real_start, *real_end;
{
  struct glyph_string *head, *tail;
  struct glyph_string *s;
  int last_x, area_width;
  int x_reached;
  int i, j;

  /* Let's rather be paranoid than getting a SEGV.  */
  start = max (0, start);
  end = min (end, row->used[area]);
  if (real_start)
    *real_start = start;
  if (real_end)
    *real_end = end;

  /* Translate X to frame coordinates.  Set last_x to the right
     end of the drawing area.  */
  if (row->full_width_p)
    {
      /* X is relative to the left edge of W, without scroll bars
         or flag areas.  */
      struct frame *f = XFRAME (w->frame);
      int width = FRAME_FLAGS_AREA_WIDTH (f);
      int window_left_x = WINDOW_LEFT_MARGIN (w) * CANON_X_UNIT (f);

      x += window_left_x;
      area_width = XFASTINT (w->width) * CANON_X_UNIT (f);
      last_x = window_left_x + area_width;

      if (FRAME_HAS_VERTICAL_SCROLL_BARS (f))
        {
          width = FRAME_SCROLL_BAR_WIDTH (f) * CANON_X_UNIT (f);
          if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_RIGHT (f))
            last_x += width;
          else
            x -= width;
        }

      /* If row should extend over internal borders, adjust x and
         width accordingly.  */
      if (row->internal_border_p)
        {
          x += FRAME_INTERNAL_BORDER_WIDTH (f);
          width -= 2 * FRAME_INTERNAL_BORDER_WIDTH (f);
        }
    }
  else
    {
      x = WINDOW_AREA_TO_FRAME_PIXEL_X (w, area, x);
      area_width = window_box_width (w, area);
      last_x = WINDOW_AREA_TO_FRAME_PIXEL_X (w, area, area_width);
    }

  /* Build a doubly-linked list of glyph_string structures between
     head and tail from what we have to draw.  Note that the macro
     BUILD_GLYPH_STRINGS will modify its start parameter.  That's
     the reason we use a separate variable `i'.  */
  i = start;
  BUILD_GLYPH_STRINGS (w, row, area, i, end, head, tail, hl, x, last_x);
  if (tail)
    x_reached = tail->x + tail->background_width;
  else
    x_reached = x;

  /* If there are any glyphs with lbearing < 0 or rbearing > width in
     the row, redraw some glyphs in front or following the glyph
     strings built above.  */
  if (row->contains_overlapping_glyphs_p)
    {
      int dummy_x = 0;
      struct glyph_string *h, *t;

      /* Compute overhangs for all glyph strings.  */
      for (s = head; s; s = s->next)
        x_compute_glyph_string_overhangs (s);

      /* Prepend glyph strings for glyphs in front of the first glyph
         string that are overwritten because of the first glyph
         string's left overhang.  The background of all strings
         prepended must be drawn because the first glyph string 
         draws over it.  */
      i = x_left_overwritten (head);
      if (i >= 0)
        {
          j = i;
          BUILD_GLYPH_STRINGS (w, row, area, j, start, h, t,
                               DRAW_NORMAL_TEXT, dummy_x, last_x);
          start = i;
          if (real_start)
            *real_start = start;
          x_compute_overhangs_and_x (t, head->x, 1);
          x_prepend_glyph_string_lists (&head, &tail, h, t);
        }

      /* Prepend glyph strings for glyphs in front of the first glyph
         string that overwrite that glyph string because of their
         right overhang.  For these strings, only the foreground must
         be drawn, because it draws over the glyph string at `head'.
         The background must not be drawn because this would overwrite
         right overhangs of preceding glyphs for which no glyph
         strings exist.  */
      i = x_left_overwriting (head);
      if (i >= 0)
        {
          BUILD_GLYPH_STRINGS (w, row, area, i, start, h, t,
                               DRAW_NORMAL_TEXT, dummy_x, last_x);
          for (s = h; s; s = s->next)
            s->background_filled_p = 1;
          if (real_start)
            *real_start = i;
          x_compute_overhangs_and_x (t, head->x, 1);
          x_prepend_glyph_string_lists (&head, &tail, h, t);
        }

      /* Append glyphs strings for glyphs following the last glyph
         string tail that are overwritten by tail.  The background of
         these strings has to be drawn because tail's foreground draws
         over it.  */
      i = x_right_overwritten (tail);
      if (i >= 0)
        {
          BUILD_GLYPH_STRINGS (w, row, area, end, i, h, t,
                               DRAW_NORMAL_TEXT, x, last_x);
          x_compute_overhangs_and_x (h, tail->x + tail->width, 0);
          x_append_glyph_string_lists (&head, &tail, h, t);
          if (real_end)
            *real_end = i;
        }

      /* Append glyph strings for glyphs following the last glyph
         string tail that overwrite tail.  The foreground of such
         glyphs has to be drawn because it writes into the background
         of tail.  The background must not be drawn because it could
         paint over the foreground of following glyphs.  */
      i = x_right_overwriting (tail);
      if (i >= 0)
        {
          BUILD_GLYPH_STRINGS (w, row, area, end, i, h, t,
                               DRAW_NORMAL_TEXT, x, last_x);
          for (s = h; s; s = s->next)
            s->background_filled_p = 1;
          x_compute_overhangs_and_x (h, tail->x + tail->width, 0);
          x_append_glyph_string_lists (&head, &tail, h, t);
          if (real_end)
            *real_end = i;
        }
    }

  /* Draw all strings.  */
  for (s = head; s; s = s->next)
    x_draw_glyph_string (s);

  /* Value is the x-position up to which drawn, relative to AREA of W.
     This doesn't include parts drawn because of overhangs.  */
  x_reached = FRAME_TO_WINDOW_PIXEL_X (w, x_reached);
  if (!row->full_width_p)
    {
      if (area > LEFT_MARGIN_AREA)
        x_reached -= window_box_width (w, LEFT_MARGIN_AREA);
      if (area > TEXT_AREA)
        x_reached -= window_box_width (w, TEXT_AREA);
    }
  return x_reached;
}


/* Output LEN glyphs starting at START at the nominal cursor position.
   Advance the nominal cursor over the text.  The global variable
   updated_window contains the window being updated, updated_row is
   the glyph row being updated, and updated_area is the area of that
   row being updated.  */

static void
x_write_glyphs (start, len)
     struct glyph *start;
     int len;
{
  int x, hpos, real_start, real_end;

  xassert (updated_window && updated_row);
  BLOCK_INPUT;
  
  /* Write glyphs.  */

  hpos = start - updated_row->glyphs[updated_area];
  x = x_draw_glyphs (updated_window, output_cursor.x,
                     updated_row, updated_area,
                     hpos, hpos + len,
                     (updated_row->inverse_p
                      ? DRAW_INVERSE_VIDEO : DRAW_NORMAL_TEXT),
                     &real_start, &real_end);

  /* If we drew over the cursor, note that it is not visible any more.  */
  note_overwritten_text_cursor (updated_window, real_start,
                                real_end - real_start);

  UNBLOCK_INPUT;
  
  /* Advance the output cursor.  */
  output_cursor.hpos += len;
  output_cursor.x = x;
}


/* Insert LEN glyphs from START at the nominal cursor position.   */

static void
x_insert_glyphs (start, len)
     struct glyph *start;
     register int len;
{
  struct frame *f;
  struct window *w;
  int line_height, shift_by_width, shifted_region_width;
  struct glyph_row *row;
  struct glyph *glyph;
  int frame_x, frame_y, hpos, real_start, real_end;

  xassert (updated_window && updated_row);
  BLOCK_INPUT;
  w = updated_window;
  f = XFRAME (WINDOW_FRAME (w));

  /* Get the height of the line we are in.  */
  row = updated_row;
  line_height = row->height;

  /* Get the width of the glyphs to insert.  */
  shift_by_width = 0;
  for (glyph = start; glyph < start + len; ++glyph)
    shift_by_width += glyph->pixel_width;

  /* Get the width of the region to shift right.  */
  shifted_region_width = (window_box_width (w, updated_area)
                          - output_cursor.x
                          - shift_by_width);

  /* Shift right.  */
  frame_x = WINDOW_TO_FRAME_PIXEL_X (w, output_cursor.x);
  frame_y = WINDOW_TO_FRAME_PIXEL_Y (w, output_cursor.y);
  XCopyArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), FRAME_X_WINDOW (f),
             f->output_data.x->normal_gc,
             frame_x, frame_y,
             shifted_region_width, line_height,
             frame_x + shift_by_width, frame_y);

  /* Write the glyphs.  */
  hpos = start - row->glyphs[updated_area];
  x_draw_glyphs (w, output_cursor.x, row, updated_area, hpos, hpos + len,
                 DRAW_NORMAL_TEXT, &real_start, &real_end);
  note_overwritten_text_cursor (w, real_start, real_end - real_start);
  
  /* Advance the output cursor.  */
  output_cursor.hpos += len;
  output_cursor.x += shift_by_width;
  UNBLOCK_INPUT;
}


/* Delete N glyphs at the nominal cursor position.  Not implemented
   for X frames.  */

static void
x_delete_glyphs (n)
     register int n;
{
  abort ();
}


/* Erase the current text line from the nominal cursor position
   (inclusive) to pixel column TO_X (exclusive).  The idea is that
   everything from TO_X onward is already erased.

   TO_X is a pixel position relative to updated_area of
   updated_window.  TO_X == -1 means clear to the end of this area.  */

static void
x_clear_end_of_line (to_x)
     int to_x;
{
  struct frame *f;
  struct window *w = updated_window;
  int max_x, min_y, max_y;
  int from_x, from_y, to_y;
  
  xassert (updated_window && updated_row);
  f = XFRAME (w->frame);
  
  if (updated_row->full_width_p)
    {
      max_x = XFASTINT (w->width) * CANON_X_UNIT (f);
      if (FRAME_HAS_VERTICAL_SCROLL_BARS (f)
          && !w->pseudo_window_p)
        max_x += FRAME_SCROLL_BAR_WIDTH (f) * CANON_X_UNIT (f);
    }
  else
    max_x = window_box_width (w, updated_area);
  max_y = window_text_bottom_y (w);

  /* TO_X == 0 means don't do anything.  TO_X < 0 means clear to end
     of window.  For TO_X > 0, truncate to end of drawing area.  */
  if (to_x == 0)
    return;
  else if (to_x < 0)
    to_x = max_x;
  else
    to_x = min (to_x, max_x);

  to_y = min (max_y, output_cursor.y + updated_row->height);
  
  /* Notice if the cursor will be cleared by this operation.  */
  if (!updated_row->full_width_p)
    note_overwritten_text_cursor (w, output_cursor.hpos, -1);

  from_x = output_cursor.x;
     
  /* Translate to frame coordinates.  */
  if (updated_row->full_width_p)
    {
      from_x = WINDOW_TO_FRAME_PIXEL_X (w, from_x);
      to_x = WINDOW_TO_FRAME_PIXEL_X (w, to_x);
    }
  else
    {
      from_x = WINDOW_AREA_TO_FRAME_PIXEL_X (w, updated_area, from_x);
      to_x = WINDOW_AREA_TO_FRAME_PIXEL_X (w, updated_area, to_x);
    }
  
  min_y = WINDOW_DISPLAY_TOP_LINE_HEIGHT (w);
  from_y = WINDOW_TO_FRAME_PIXEL_Y (w, max (min_y, output_cursor.y));
  to_y = WINDOW_TO_FRAME_PIXEL_Y (w, to_y);
  
  /* Prevent inadvertently clearing to end of the X window.  */
  if (to_x > from_x && to_y > from_y)
    {
      BLOCK_INPUT;
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                  from_x, from_y, to_x - from_x, to_y - from_y,
                  False);
      UNBLOCK_INPUT;
    }
}


/* Clear entire frame.  If updating_frame is non-null, clear that
   frame.  Otherwise clear selected_frame.  */

static void
x_clear_frame ()
{
  struct frame *f;

  if (updating_frame)
    f = updating_frame;
  else
    f = selected_frame;

  /* Clearing the frame will erase any cursor, so mark them all as no
     longer visible.  */
  mark_window_cursors_off (XWINDOW (FRAME_ROOT_WINDOW (f)));
  output_cursor.hpos = output_cursor.vpos = 0;
  output_cursor.x = -1;

  /* We don't set the output cursor here because there will always
     follow an explicit cursor_to.  */
  BLOCK_INPUT;
  XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));

  /* 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);

  XFlush (FRAME_X_DISPLAY (f));
  UNBLOCK_INPUT;
}


\f
/* Invert the middle quarter of the frame for .15 sec.  */

/* We use the select system call to do the waiting, so we have to make
   sure it's available.  If it isn't, we just won't do visual bells.  */

#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)


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

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

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

  /* Return indication of whether the result should be considered
     negative.  */
  return x.tv_sec < y.tv_sec;
}

void
XTflash (f)
     struct frame *f;
{
  BLOCK_INPUT;

  {
    GC gc;

    /* Create a GC that will use the GXxor function to flip foreground
       pixels into background pixels.  */
    {
      XGCValues values;

      values.function = GXxor;
      values.foreground = (f->output_data.x->foreground_pixel
                           ^ f->output_data.x->background_pixel);

      gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      GCFunction | GCForeground, &values);
    }

    {
      /* Get the height not including a menu bar widget.  */
      int height = CHAR_TO_PIXEL_HEIGHT (f, FRAME_HEIGHT (f));
      /* Height of each line to flash.  */
      int flash_height = FRAME_LINE_HEIGHT (f);
      /* These will be the left and right margins of the rectangles.  */
      int flash_left = FRAME_INTERNAL_BORDER_WIDTH (f);
      int flash_right = PIXEL_WIDTH (f) - FRAME_INTERNAL_BORDER_WIDTH (f);

      int width;

      /* Don't flash the area between a scroll bar and the frame
         edge it is next to.  */
      switch (FRAME_VERTICAL_SCROLL_BAR_TYPE (f))
        {
        case vertical_scroll_bar_left:
          flash_left += VERTICAL_SCROLL_BAR_WIDTH_TRIM;
          break;

        case vertical_scroll_bar_right:
          flash_right -= VERTICAL_SCROLL_BAR_WIDTH_TRIM;
          break;

        default:
          break;
        }

      width = flash_right - flash_left;

      /* If window is tall, flash top and bottom line.  */
      if (height > 3 * FRAME_LINE_HEIGHT (f))
        {
          XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                          flash_left,
                          (FRAME_INTERNAL_BORDER_WIDTH (f)
                           + FRAME_TOOLBAR_LINES (f) * CANON_Y_UNIT (f)),
                          width, flash_height);
          XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                          flash_left,
                          (height - flash_height
                           - FRAME_INTERNAL_BORDER_WIDTH (f)),
                          width, flash_height);
        }
      else
        /* If it is short, flash it all.  */ 
        XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                        flash_left, FRAME_INTERNAL_BORDER_WIDTH (f),
                        width, height - 2 * FRAME_INTERNAL_BORDER_WIDTH (f));

      x_flush (f);

      {
        struct timeval wakeup;

        EMACS_GET_TIME (wakeup);

        /* Compute time to wait until, propagating carry from usecs.  */
        wakeup.tv_usec += 150000;
        wakeup.tv_sec += (wakeup.tv_usec / 1000000);
        wakeup.tv_usec %= 1000000;

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

            EMACS_GET_TIME (timeout);

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

            /* Try to wait that long--but we might wake up sooner.  */
            select (0, NULL, NULL, NULL, &timeout);
          }
      }

      /* If window is tall, flash top and bottom line.  */
      if (height > 3 * FRAME_LINE_HEIGHT (f))
        {
          XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                          flash_left,
                          (FRAME_INTERNAL_BORDER_WIDTH (f)
                           + FRAME_TOOLBAR_LINES (f) * CANON_Y_UNIT (f)),
                          width, flash_height);
          XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                          flash_left,
                          (height - flash_height
                           - FRAME_INTERNAL_BORDER_WIDTH (f)),
                          width, flash_height);
        }
      else
        /* If it is short, flash it all.  */ 
        XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
                        flash_left, FRAME_INTERNAL_BORDER_WIDTH (f),
                        width, height - 2 * FRAME_INTERNAL_BORDER_WIDTH (f));

      XFreeGC (FRAME_X_DISPLAY (f), gc);
      x_flush (f);
    }
  }

  UNBLOCK_INPUT;
}

#endif /* defined (HAVE_TIMEVAL) && defined (HAVE_SELECT) */


/* Make audible bell.  */

#define XRINGBELL XBell (FRAME_X_DISPLAY (selected_frame), 0)

void
XTring_bell ()
{
  if (FRAME_X_DISPLAY (selected_frame) == 0)
    return;

#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
  if (visible_bell)
    XTflash (selected_frame);
  else
#endif
    {
      BLOCK_INPUT;
      XRINGBELL;
      XFlush (FRAME_X_DISPLAY (selected_frame));
      UNBLOCK_INPUT;
    }
}

\f
/* Specify how many text lines, from the top of the window,
   should be affected by insert-lines and delete-lines operations.
   This, and those operations, are used only within an update
   that is bounded by calls to x_update_begin and x_update_end.  */

static void
XTset_terminal_window (n)
     register int n;
{
  /* This function intentionally left blank.  */
}


\f
/***********************************************************************
                              Line Dance
 ***********************************************************************/

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

static void
x_ins_del_lines (vpos, n)
     int vpos, n;
{
  abort ();
}


/* Scroll part of the display as described by RUN.  */

static void
x_scroll_run (w, run)
     struct window *w;
     struct run *run;
{
  struct frame *f = XFRAME (w->frame);
  int x, y, width, height, from_y, to_y, bottom_y;

  /* Get frame-relative bounding box of the text display area of W,
     without mode lines.  Include in this box the flags areas to the
     left and right of W.  */
  window_box (w, -1, &x, &y, &width, &height);
  width += 2 * FRAME_X_FLAGS_AREA_WIDTH (f);
  x -= FRAME_X_FLAGS_AREA_WIDTH (f);

  from_y = WINDOW_TO_FRAME_PIXEL_Y (w, run->current_y);
  to_y = WINDOW_TO_FRAME_PIXEL_Y (w, run->desired_y);
  bottom_y = y + height;

  if (to_y < from_y)
    {
      /* Scrolling up.  Make sure we don't copy part of the mode
         line at the bottom.  */
      if (from_y + run->height > bottom_y)
        height = bottom_y - from_y;
      else
        height = run->height;
    }
  else
    {
      /* Scolling down.  Make sure we don't copy over the mode line.
         at the bottom.  */
      if (to_y + run->height > bottom_y)
        height = bottom_y - to_y;
      else
        height = run->height;
    }

  BLOCK_INPUT;
  
  /* Cursor off.  Will be switched on again in x_update_window_end.  */
  updated_window = w;
  x_clear_cursor (w);

  XCopyArea (FRAME_X_DISPLAY (f),
             FRAME_X_WINDOW (f), FRAME_X_WINDOW (f),
             f->output_data.x->normal_gc,
             x, from_y,
             width, height,
             x, to_y);
  
  UNBLOCK_INPUT;
}


\f
/***********************************************************************
                           Exposure Events
 ***********************************************************************/
                                                                        
/* Redisplay an exposed area of frame F.  X and Y are the upper-left
   corner of the exposed rectangle.  W and H are width and height of
   the exposed area.  All are pixel values.  W or H zero means redraw
   the entire frame.  */

static void
expose_frame (f, x, y, w, h)
     struct frame *f;
     int x, y, w, h;
{
  XRectangle r;

  TRACE ((stderr, "expose_frame "));

  /* No need to redraw if frame will be redrawn soon.  */
  if (FRAME_GARBAGED_P (f))
    {
      TRACE ((stderr, " garbaged\n"));
      return;
    }

  /* If basic faces haven't been realized yet, there is no point in
     trying to redraw anything.  This can happen when we get an expose
     event while Emacs is starting, e.g. by moving another window.  */
  if (FRAME_FACE_CACHE (f) == NULL
      || FRAME_FACE_CACHE (f)->used < BASIC_FACE_ID_SENTINEL)
    {
      TRACE ((stderr, " no faces\n"));
      return;
    }

  if (w == 0 || h == 0)
    {
      r.x = r.y = 0;
      r.width = CANON_X_UNIT (f) * f->width;
      r.height = CANON_Y_UNIT (f) * f->height;
    }
  else
    {
      r.x = x;
      r.y = y;
      r.width = w;
      r.height = h;
    }

  TRACE ((stderr, "(%d, %d, %d, %d)\n", r.x, r.y, r.width, r.height));
  expose_window_tree (XWINDOW (f->root_window), &r);

  if (WINDOWP (f->toolbar_window))
    {
      struct window *w = XWINDOW (f->toolbar_window);
      XRectangle window_rect;
      XRectangle intersection_rect;
      int window_x, window_y, window_width, window_height;
      

      window_box (w, -1, &window_x, &window_y, &window_width, &window_height);
      window_rect.x = window_x;
      window_rect.y = window_y;
      window_rect.width = window_width;
      window_rect.height = window_height;

      if (x_intersect_rectangles (&r, &window_rect, &intersection_rect))
        expose_window (w, &intersection_rect);
    }

#ifndef USE_X_TOOLKIT
  if (WINDOWP (f->menu_bar_window))
    {
      struct window *w = XWINDOW (f->menu_bar_window);
      XRectangle window_rect;
      XRectangle intersection_rect;
      int window_x, window_y, window_width, window_height;
      

      window_box (w, -1, &window_x, &window_y, &window_width, &window_height);
      window_rect.x = window_x;
      window_rect.y = window_y;
      window_rect.width = window_width;
      window_rect.height = window_height;

      if (x_intersect_rectangles (&r, &window_rect, &intersection_rect))
        expose_window (w, &intersection_rect);
    }
#endif /* not USE_X_TOOLKIT */
}


/* Redraw (parts) of all windows in the window tree rooted at W that
   intersect R.  R contains frame pixel coordinates.  */

static void
expose_window_tree (w, r)
     struct window *w;
     XRectangle *r;
{
  while (w)
    {
      if (!NILP (w->hchild))
        expose_window_tree (XWINDOW (w->hchild), r);
      else if (!NILP (w->vchild))
        expose_window_tree (XWINDOW (w->vchild), r);
      else
        {
          XRectangle window_rect;
          XRectangle intersection_rect;
          struct frame *f = XFRAME (w->frame);
          int window_x, window_y, window_width, window_height;

          /* Frame-relative pixel rectangle of W.  */
          window_box (w, -1, &window_x, &window_y, &window_width,
                      &window_height);
          window_rect.x
            = (window_x
               - FRAME_X_FLAGS_AREA_WIDTH (f)
               - FRAME_LEFT_SCROLL_BAR_WIDTH (f) * CANON_Y_UNIT (f));
          window_rect.y = window_y;
          window_rect.width
            = (window_width
               + 2 * FRAME_X_FLAGS_AREA_WIDTH (f)
               + FRAME_SCROLL_BAR_WIDTH (f) * CANON_X_UNIT (f));
          window_rect.height
            = window_height + CURRENT_MODE_LINE_HEIGHT (w);

          if (x_intersect_rectangles (r, &window_rect, &intersection_rect))
            expose_window (w, &intersection_rect);
        }

      w = NILP (w->next) ? 0 : XWINDOW (w->next);
    }
}


/* Redraw the part of glyph row area AREA of glyph row ROW on window W
   which intersects rectangle R.  R is in window-relative coordinates.  */

static void
expose_area (w, row, r, area)
     struct window *w;
     struct glyph_row *row;
     XRectangle *r;
     enum glyph_row_area area;
{
  int x;
  struct glyph *first = row->glyphs[area];
  struct glyph *end = row->glyphs[area] + row->used[area];
  struct glyph *last;
  int first_x;

  /* Set x to the window-relative start position for drawing glyphs of
     AREA.  The first glyph of the text area can be partially visible.
     The first glyphs of other areas cannot.  */
  if (area == LEFT_MARGIN_AREA)
    x = 0;
  else if (area == TEXT_AREA)
    x = row->x + window_box_width (w, LEFT_MARGIN_AREA);
  else
    x = (window_box_width (w, LEFT_MARGIN_AREA)
         + window_box_width (w, TEXT_AREA));

  /* Find the first glyph that must be redrawn.  */
  while (first < end
         && x + first->pixel_width < r->x)
    {
      x += first->pixel_width;
      ++first;
    }
  
  /* Find the last one.  */
  last = first;
  first_x = x;
  while (last < end
         && x < r->x + r->width)
    {
      x += last->pixel_width;
      ++last;
    }
      
  /* Repaint.  */
  if (last > first)
    x_draw_glyphs (w, first_x, row, area,
                   first - row->glyphs[area],
                   last - row->glyphs[area],
                   row->inverse_p ? DRAW_INVERSE_VIDEO : DRAW_NORMAL_TEXT,
                   NULL, NULL);
}
      

/* Redraw the parts of the glyph row ROW on window W intersecting
   rectangle R.  R is in window-relative coordinates.  */

static void
expose_line (w, row, r)
     struct window *w;
     struct glyph_row *row;
     XRectangle *r;
{
  xassert (row->enabled_p);
  
  if (row->mode_line_p || w->pseudo_window_p)
    x_draw_glyphs (w, 0, row, TEXT_AREA, 0, row->used[TEXT_AREA],
                   row->inverse_p ? DRAW_INVERSE_VIDEO : DRAW_NORMAL_TEXT,
                   NULL, NULL);
  else
    {
      if (row->used[LEFT_MARGIN_AREA])
        expose_area (w, row, r, LEFT_MARGIN_AREA);
      if (row->used[TEXT_AREA])
        expose_area (w, row, r, TEXT_AREA);
      if (row->used[RIGHT_MARGIN_AREA])
        expose_area (w, row, r, RIGHT_MARGIN_AREA);
      x_draw_row_bitmaps (w, row);
    }
}


/* Return non-zero if W's cursor intersects rectangle R.  */

static int
x_phys_cursor_in_rect_p (w, r)
     struct window *w;
     XRectangle *r;
{
  XRectangle cr, result;
  struct glyph *cursor_glyph;

  cursor_glyph = get_phys_cursor_glyph (w);
  if (cursor_glyph)
    {
      cr.x = w->phys_cursor.x;
      cr.y = w->phys_cursor.y;
      cr.width = cursor_glyph->pixel_width;
      cr.height = w->phys_cursor_height;
      return x_intersect_rectangles (&cr, r, &result);
    }
  else
    return 0;
}


/* Redraw a rectangle of window W.  R is a rectangle in window
   relative coordinates.  Call this function with input blocked.  */

static void
expose_window (w, r)
     struct window *w;
     XRectangle *r;
{
  struct glyph_row *row;
  int y;
  int yb = window_text_bottom_y (w);
  int cursor_cleared_p;

  TRACE ((stderr, "expose_window (%d, %d, %d, %d)\n",
          r->x, r->y, r->width, r->height));

  /* Convert to window coordinates.  */
  r->x = FRAME_TO_WINDOW_PIXEL_X (w, r->x);
  r->y = FRAME_TO_WINDOW_PIXEL_Y (w, r->y);

  /* Turn off the cursor.  */
  if (!w->pseudo_window_p
      && x_phys_cursor_in_rect_p (w, r))
    {
      x_clear_cursor (w);
      cursor_cleared_p = 1;
    }
  else
    cursor_cleared_p = 0;

  /* Find the first row intersecting the rectangle R.  */
  row = w->current_matrix->rows;
  y = 0;
  while (row->enabled_p
         && y < yb
         && y + row->height < r->y)
    {
      y += row->height;
      ++row;
    }
        
  /* Display the text in the rectangle, one text line at a time.  */
  while (row->enabled_p
         && y < yb
         && y < r->y + r->height)
    {
      expose_line (w, row, r);
      y += row->height;
      ++row;
    }

  /* Display the mode line if there is one.  */
  if (WINDOW_WANTS_MODELINE_P (w)
      && (row = MATRIX_MODE_LINE_ROW (w->current_matrix),
          row->enabled_p)
      && row->y < r->y + r->height)
    expose_line (w, row, r);

  if (!w->pseudo_window_p)
    {
      /* Draw border between windows.  */
      x_draw_vertical_border (w);
      
      /* Turn the cursor on again.  */
      if (cursor_cleared_p)
        x_update_window_cursor (w, 1);
    }
}


/* Determine the intersection of two rectangles R1 and R2.  Return
   the intersection in *RESULT.  Value is non-zero if RESULT is not
   empty.  */

static int
x_intersect_rectangles (r1, r2, result)
     XRectangle *r1, *r2, *result;
{
  XRectangle *left, *right;
  XRectangle *upper, *lower;
  int intersection_p = 0;
  
  /* Rearrange so that R1 is the left-most rectangle.  */
  if (r1->x < r2->x)
    left = r1, right = r2;
  else
    left = r2, right = r1;

  /* X0 of the intersection is right.x0, if this is inside R1,
     otherwise there is no intersection.  */
  if (right->x <= left->x + left->width)
    {
      result->x = right->x;
      
      /* The right end of the intersection is the minimum of the
         the right ends of left and right.  */
      result->width = (min (left->x + left->width, right->x + right->width)
                       - result->x);

      /* Same game for Y.  */
      if (r1->y < r2->y)
        upper = r1, lower = r2;
      else
        upper = r2, lower = r1;

      /* The upper end of the intersection is lower.y0, if this is inside
         of upper.  Otherwise, there is no intersection.  */
      if (lower->y <= upper->y + upper->height)
        {
          result->y = lower->y;
          
          /* The lower end of the intersection is the minimum of the lower
             ends of upper and lower.  */
          result->height = (min (lower->y + lower->height, 
                                 upper->y + upper->height)
                            - result->y);
          intersection_p = 1;
        }
    }

  return intersection_p;
}




\f
static void
frame_highlight (f)
     struct frame *f;
{
  /* We used to only do this if Vx_no_window_manager was non-nil, but
     the ICCCM (section 4.1.6) says that the window's border pixmap
     and border pixel are window attributes which are "private to the
     client", so we can always change it to whatever we want.  */
  BLOCK_INPUT;
  XSetWindowBorder (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                    f->output_data.x->border_pixel);
  UNBLOCK_INPUT;
  x_update_cursor (f, 1);
}

static void
frame_unhighlight (f)
     struct frame *f;
{
  /* We used to only do this if Vx_no_window_manager was non-nil, but
     the ICCCM (section 4.1.6) says that the window's border pixmap
     and border pixel are window attributes which are "private to the
     client", so we can always change it to whatever we want.  */
  BLOCK_INPUT;
  XSetWindowBorderPixmap (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                          f->output_data.x->border_tile);
  UNBLOCK_INPUT;
  x_update_cursor (f, 1);
}

/* 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.  */

static void
x_new_focus_frame (dpyinfo, frame)
     struct x_display_info *dpyinfo;
     struct frame *frame;
{
  struct frame *old_focus = dpyinfo->x_focus_frame;

  if (frame != dpyinfo->x_focus_frame)
    {
      /* Set this before calling other routines, so that they see
         the correct value of x_focus_frame.  */
      dpyinfo->x_focus_frame = frame;

      if (old_focus && old_focus->auto_lower)
        x_lower_frame (old_focus);

#if 0
      selected_frame = frame;
      XSETFRAME (XWINDOW (selected_frame->selected_window)->frame,
                 selected_frame);
      Fselect_window (selected_frame->selected_window);
      choose_minibuf_frame ();
#endif /* ! 0 */

      if (dpyinfo->x_focus_frame && dpyinfo->x_focus_frame->auto_raise)
        pending_autoraise_frame = dpyinfo->x_focus_frame;
      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)
     struct x_display_info *dpyinfo;
{
  x_new_focus_frame (dpyinfo, dpyinfo->x_focus_event_frame);
}

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

   The FRAME argument doesn't necessarily have anything to do with which
   frame is being highlighted or un-highlighted; we only use it to find
   the appropriate X display info.  */

static void
XTframe_rehighlight (frame)
     struct frame *frame;
{
  x_frame_rehighlight (FRAME_X_DISPLAY_INFO (frame));
}

static void
x_frame_rehighlight (dpyinfo)
     struct x_display_info *dpyinfo;
{
  struct frame *old_highlight = dpyinfo->x_highlight_frame;

  if (dpyinfo->x_focus_frame)
    {
      dpyinfo->x_highlight_frame
        = ((GC_FRAMEP (FRAME_FOCUS_FRAME (dpyinfo->x_focus_frame)))
           ? XFRAME (FRAME_FOCUS_FRAME (dpyinfo->x_focus_frame))
           : dpyinfo->x_focus_frame);
      if (! FRAME_LIVE_P (dpyinfo->x_highlight_frame))
        {
          FRAME_FOCUS_FRAME (dpyinfo->x_focus_frame) = Qnil;
          dpyinfo->x_highlight_frame = dpyinfo->x_focus_frame;
        }
    }
  else
    dpyinfo->x_highlight_frame = 0;

  if (dpyinfo->x_highlight_frame != old_highlight)
    {
      if (old_highlight)
        frame_unhighlight (old_highlight);
      if (dpyinfo->x_highlight_frame)
        frame_highlight (dpyinfo->x_highlight_frame);
    }
}


\f
/* Keyboard processing - modifier keys, vendor-specific keysyms, etc.  */

/* Initialize mode_switch_bit and modifier_meaning.  */
static void
x_find_modifier_meanings (dpyinfo)
     struct x_display_info *dpyinfo;
{
  int min_code, max_code;
  KeySym *syms;
  int syms_per_code;
  XModifierKeymap *mods;

  dpyinfo->meta_mod_mask = 0;
  dpyinfo->shift_lock_mask = 0;
  dpyinfo->alt_mod_mask = 0;
  dpyinfo->super_mod_mask = 0;
  dpyinfo->hyper_mod_mask = 0;

#ifdef HAVE_X11R4
  XDisplayKeycodes (dpyinfo->display, &min_code, &max_code);
#else
  min_code = dpyinfo->display->min_keycode;
  max_code = dpyinfo->display->max_keycode;
#endif

  syms = XGetKeyboardMapping (dpyinfo->display,
                              min_code, max_code - min_code + 1,
                              &syms_per_code);
  mods = XGetModifierMapping (dpyinfo->display);

  /* Scan the modifier table to see which modifier bits the Meta and
     Alt keysyms are on.  */
  {
    int row, col;       /* The row and column in the modifier table.  */

    for (row = 3; row < 8; row++)
      for (col = 0; col < mods->max_keypermod; col++)
        {
          KeyCode code
            = mods->modifiermap[(row * mods->max_keypermod) + col];

          /* Zeroes are used for filler.  Skip them.  */
          if (code == 0)
            continue;

          /* Are any of this keycode's keysyms a meta key?  */
          {
            int code_col;

            for (code_col = 0; code_col < syms_per_code; code_col++)
              {
                int sym = syms[((code - min_code) * syms_per_code) + code_col];

                switch (sym)
                  {
                  case XK_Meta_L:
                  case XK_Meta_R:
                    dpyinfo->meta_mod_mask |= (1 << row);
                    break;

                  case XK_Alt_L:
                  case XK_Alt_R:
                    dpyinfo->alt_mod_mask |= (1 << row);
                    break;

                  case XK_Hyper_L:
                  case XK_Hyper_R:
                    dpyinfo->hyper_mod_mask |= (1 << row);
                    break;

                  case XK_Super_L:
                  case XK_Super_R:
                    dpyinfo->super_mod_mask |= (1 << row);
                    break;

                  case XK_Shift_Lock:
                    /* Ignore this if it's not on the lock modifier.  */
                    if ((1 << row) == LockMask)
                      dpyinfo->shift_lock_mask = LockMask;
                    break;
                  }
              }
          }
        }
  }

  /* If we couldn't find any meta keys, accept any alt keys as meta keys.  */
  if (! dpyinfo->meta_mod_mask)
    {
      dpyinfo->meta_mod_mask = dpyinfo->alt_mod_mask;
      dpyinfo->alt_mod_mask = 0;
    }

  /* If some keys are both alt and meta,
     make them just meta, not alt.  */
  if (dpyinfo->alt_mod_mask & dpyinfo->meta_mod_mask)
    {
      dpyinfo->alt_mod_mask &= ~dpyinfo->meta_mod_mask;
    }

  XFree ((char *) syms);
  XFreeModifiermap (mods);
}

/* Convert between the modifier bits X uses and the modifier bits
   Emacs uses.  */

static unsigned int
x_x_to_emacs_modifiers (dpyinfo, state)
     struct x_display_info *dpyinfo;
     unsigned int state;
{
  return (  ((state & (ShiftMask | dpyinfo->shift_lock_mask)) ? shift_modifier : 0)
          | ((state & ControlMask)             ? ctrl_modifier  : 0)
          | ((state & dpyinfo->meta_mod_mask)  ? meta_modifier  : 0)
          | ((state & dpyinfo->alt_mod_mask)   ? alt_modifier  : 0)
          | ((state & dpyinfo->super_mod_mask) ? super_modifier  : 0)
          | ((state & dpyinfo->hyper_mod_mask) ? hyper_modifier  : 0));
}

static unsigned int
x_emacs_to_x_modifiers (dpyinfo, state)
     struct x_display_info *dpyinfo;
     unsigned int state;
{
  return (  ((state & alt_modifier)     ? dpyinfo->alt_mod_mask   : 0)
          | ((state & super_modifier)   ? dpyinfo->super_mod_mask : 0)
          | ((state & hyper_modifier)   ? dpyinfo->hyper_mod_mask : 0)
          | ((state & shift_modifier)   ? ShiftMask        : 0)
          | ((state & ctrl_modifier)    ? ControlMask      : 0)
          | ((state & meta_modifier)    ? dpyinfo->meta_mod_mask  : 0));
}

/* Convert a keysym to its name.  */

char *
x_get_keysym_name (keysym)
     KeySym keysym;
{
  char *value;

  BLOCK_INPUT;
  value = XKeysymToString (keysym);
  UNBLOCK_INPUT;

  return value;
}


\f
/* Mouse clicks and mouse movement.  Rah.  */

/* Given a pixel position (PIX_X, PIX_Y) on 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 non-zero, 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;
     XRectangle *bounds;
     int noclip;
{
  /* Arrange for the division in PIXEL_TO_CHAR_COL etc.  to round down
     even for negative values.  */
  if (pix_x < 0)
    pix_x -= FONT_WIDTH ((f)->output_data.x->font) - 1;
  if (pix_y < 0)
    pix_y -= (f)->output_data.x->line_height - 1;

  pix_x = PIXEL_TO_CHAR_COL (f, pix_x);
  pix_y = PIXEL_TO_CHAR_ROW (f, pix_y);

  if (bounds)
    {
      bounds->width  = FONT_WIDTH  (f->output_data.x->font);
      bounds->height = f->output_data.x->line_height;
      bounds->x = CHAR_TO_PIXEL_COL (f, pix_x);
      bounds->y = CHAR_TO_PIXEL_ROW (f, pix_y);
    }

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

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

  *x = pix_x;
  *y = pix_y;
}


/* Given HPOS/VPOS in the current matrix of W, return corresponding
   frame-relative pixel positions in *FRAME_X and *FRAME_Y.  If we
   can't tell the positions because W's display is not up to date,
   return 0.  */

int
glyph_to_pixel_coords (w, hpos, vpos, frame_x, frame_y)
     struct window *w;
     int hpos, vpos;
     int *frame_x, *frame_y;
{
  int success_p;

  xassert (hpos >= 0 && hpos < w->current_matrix->matrix_w);
  xassert (vpos >= 0 && vpos < w->current_matrix->matrix_h);

  if (display_completed)
    {
      struct glyph_row *row = MATRIX_ROW (w->current_matrix, vpos);
      struct glyph *glyph = row->glyphs[TEXT_AREA];
      struct glyph *end = glyph + min (hpos, row->used[TEXT_AREA]);

      *frame_y = row->y;
      *frame_x = row->x;
      while (glyph < end)
        {
          *frame_x += glyph->pixel_width;
          ++glyph;
        }

      success_p = 1;
    }
  else
    {
      *frame_y = *frame_x = 0;
      success_p = 0;
    }

  *frame_y = WINDOW_TO_FRAME_PIXEL_Y (w, *frame_y);
  *frame_x = WINDOW_TO_FRAME_PIXEL_X (w, *frame_x);
  return success_p;
}


/* 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 Lisp_Object
construct_mouse_click (result, event, f)
     struct input_event *result;
     XButtonEvent *event;
     struct frame *f;
{
  /* Make the event type no_event; we'll change that when we decide
     otherwise.  */
  result->kind = mouse_click;
  result->code = event->button - Button1;
  result->timestamp = event->time;
  result->modifiers = (x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO (f),
                                               event->state)
                       | (event->type == ButtonRelease
                          ? up_modifier
                          : down_modifier));

  XSETINT (result->x, event->x);
  XSETINT (result->y, event->y);
  XSETFRAME (result->frame_or_window, f);
  return Qnil;
}

#if 0 /* This function isn't called. --gerd  */

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

static Lisp_Object
construct_menu_click (result, event, f)
     struct input_event *result;
     XButtonEvent *event;
     struct frame *f;
{
  /* Make the event type no_event; we'll change that when we decide
     otherwise.  */
  result->kind = mouse_click;
  result->code = event->button - Button1;
  result->timestamp = event->time;
  result->modifiers = (x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO (f),
                                               event->state)
                       | (event->type == ButtonRelease
                          ? up_modifier
                          : down_modifier));

  XSETINT (result->x, event->x);
  XSETINT (result->y, -1);
  XSETFRAME (result->frame_or_window, f);
}

#endif /* 0 */

\f
/* 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 XMotionEvent last_mouse_motion_event;
static Lisp_Object last_mouse_motion_frame;

static void
note_mouse_movement (frame, event)
     FRAME_PTR frame;
     XMotionEvent *event;
{
  last_mouse_movement_time = event->time;
  last_mouse_motion_event = *event;
  XSETFRAME (last_mouse_motion_frame, frame);

  if (event->window != FRAME_X_WINDOW (frame))
    {
      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 (event->x < last_mouse_glyph.x
           || event->x >= last_mouse_glyph.x + last_mouse_glyph.width
           || event->y < last_mouse_glyph.y
           || event->y >= last_mouse_glyph.y + last_mouse_glyph.height)
    {
      frame->mouse_moved = 1;
      last_mouse_scroll_bar = Qnil;
      note_mouse_highlight (frame, event->x, event->y);
    }
}

/* This is used for debugging, to turn off note_mouse_highlight.  */

 int disable_mouse_highlight;


\f
/************************************************************************
                              Mouse Face
 ************************************************************************/

/* Find the glyph under window-relative coordinates X/Y in window W.
   Consider only glyphs from buffer text, i.e. no glyphs from overlay
   strings.  Return in *HPOS and *VPOS the row and column number of
   the glyph found.  Return in *AREA the glyph area containing X.
   Value is a pointer to the glyph found or null if X/Y is not on
   text, or we can't tell because W's current matrix is not up to
   date.  */

static struct glyph *
x_y_to_hpos_vpos (w, x, y, hpos, vpos, area)
     struct window *w;
     int x, y;
     int *hpos, *vpos, *area;
{
  struct glyph *glyph, *end;
  struct glyph_row *row;
  int x0, i, left_area_width;

  /* Find row containing Y.  Give up if some row is not enabled.  */
  for (i = 0; i < w->current_matrix->nrows; ++i)
    {
      row = MATRIX_ROW (w->current_matrix, i);
      if (!row->enabled_p)
        return NULL;
      if (y >= row->y && y < MATRIX_ROW_BOTTOM_Y (row))
        break;
    }

  *vpos = i;
  *hpos = 0;

  /* Give up if Y is not in the window.  */
  if (i == w->current_matrix->nrows)
    return NULL;

  /* Get the glyph area containing X.  */
  if (w->pseudo_window_p)
    {
      *area = TEXT_AREA;
      x0 = 0;
    }
  else
    {
      left_area_width = window_box_width (w, LEFT_MARGIN_AREA);
      if (x < left_area_width)
        {
          *area = LEFT_MARGIN_AREA;
          x0 = 0;
        }
      else if (x < left_area_width + window_box_width (w, TEXT_AREA))
        {
          *area = TEXT_AREA;
          x0 = row->x + left_area_width;
        }
      else
        {
          *area = RIGHT_MARGIN_AREA;
          x0 = left_area_width + window_box_width (w, TEXT_AREA);
        }
    }

  /* Find glyph containing X.  */
  glyph = row->glyphs[*area];
  end = glyph + row->used[*area];
  while (glyph < end)
    {
      if (x < x0 + glyph->pixel_width)
        {
          if (w->pseudo_window_p)
            break;
          else if (BUFFERP (glyph->object))
            break;
        }
      
      x0 += glyph->pixel_width;
      ++glyph;
    }

  if (glyph == end)
    return NULL;

  *hpos = glyph - row->glyphs[*area];
  return glyph;
}


/* Convert frame-relative x/y to coordinates relative to window W.
   Takes pseudo-windows into account.  */

static void
frame_to_window_pixel_xy (w, x, y)
     struct window *w;
     int *x, *y;
{
  if (w->pseudo_window_p)
    {
      /* A pseudo-window is always full-width, and starts at the
         left edge of the frame, plus a frame border.  */
      struct frame *f = XFRAME (w->frame);
      *x -= FRAME_INTERNAL_BORDER_WIDTH_SAFE (f);
      *y = FRAME_TO_WINDOW_PIXEL_Y (w, *y);
    }
  else
    {
      *x = FRAME_TO_WINDOW_PIXEL_X (w, *x);
      *y = FRAME_TO_WINDOW_PIXEL_Y (w, *y);
    }
}


/* Take proper action when mouse has moved to the mode or top line of
   window W, x-position X.  MODE_LINE_P non-zero means mouse is on the
   mode line.  X is relative to the start of the text display area of
   W, so the width of bitmap areas and scroll bars must be subtracted
   to get a position relative to the start of the mode line.  */

static void
note_mode_line_highlight (w, x, mode_line_p)
     struct window *w;
     int x, mode_line_p;
{
  struct frame *f = XFRAME (w->frame);
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  Cursor cursor = dpyinfo->vertical_scroll_bar_cursor;
  struct glyph_row *row;

  if (mode_line_p)
    row = MATRIX_MODE_LINE_ROW (w->current_matrix);
  else
    row = MATRIX_TOP_LINE_ROW (w->current_matrix);
  
  if (row->enabled_p)
    {
      struct glyph *glyph, *end;
      Lisp_Object help, map;
      int x0;
      
      /* Find the glyph under X.  */
      glyph = row->glyphs[TEXT_AREA];
      end = glyph + row->used[TEXT_AREA];
      x0 = - (FRAME_LEFT_SCROLL_BAR_WIDTH (f) * CANON_X_UNIT (f)
              + FRAME_X_FLAGS_AREA_WIDTH (f));
      while (glyph < end
             && x >= x0 + glyph->pixel_width)
        {
          x0 += glyph->pixel_width;
          ++glyph;
        }

      if (glyph < end
          && STRINGP (glyph->object)
          && XSTRING (glyph->object)->intervals
          && glyph->charpos >= 0
          && glyph->charpos < XSTRING (glyph->object)->size)
        {
          /* If we're on a string with `help-echo' text property,
             arrange for the help to be displayed.  This is done by
             setting the global variable help_echo to the help string.  */
          help = Fget_text_property (make_number (glyph->charpos),
                                     Qhelp_echo, glyph->object);
          if (STRINGP (help))
            help_echo = help;

          /* Change the mouse pointer according to what is under X/Y.  */
          map = Fget_text_property (make_number (glyph->charpos),
                                    Qlocal_map, glyph->object);
          if (!NILP (Fkeymapp (map)))
            cursor = f->output_data.x->nontext_cursor;
        }
    }

  XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), cursor);
}


/* 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 de-highlighting chars where the mouse was before.
   X and Y can be negative or out of range.  */

static void
note_mouse_highlight (f, x, y)
     struct frame *f;
     int x, y;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int portion;
  Lisp_Object window;
  struct window *w;

  /* When a menu is active, don't highlight because this looks odd.  */
#ifdef USE_X_TOOLKIT
  if (popup_activated ())
    return;
#endif

  if (disable_mouse_highlight)
    return;

  dpyinfo->mouse_face_mouse_x = x;
  dpyinfo->mouse_face_mouse_y = y;
  dpyinfo->mouse_face_mouse_frame = f;

  if (dpyinfo->mouse_face_defer)
    return;

  if (gc_in_progress)
    {
      dpyinfo->mouse_face_deferred_gc = 1;
      return;
    }

  /* Which window is that in?  */
  window = window_from_coordinates (f, x, y, &portion, 1);

  /* If we were displaying active text in another window, clear that.  */
  if (! EQ (window, dpyinfo->mouse_face_window))
    clear_mouse_face (dpyinfo);

  /* Not on a window -> return.  */
  if (!WINDOWP (window))
    return;

  /* Convert to window-relative pixel coordinates.  */
  w = XWINDOW (window);
  frame_to_window_pixel_xy (w, &x, &y);

  /* Handle toolbar window differently since it doesn't display a
     buffer.  */
  if (EQ (window, f->toolbar_window))
    {
      note_toolbar_highlight (f, x, y);
      return;
    }

  if (portion == 1 || portion == 3)
    {
      /* Mouse is on the mode or top line.  */
      note_mode_line_highlight (w, x, portion == 1);
      return;
    }
  else
    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                   f->output_data.x->text_cursor);

  /* Are we in a window whose display is up to date?
     And verify the buffer's text has not changed.  */
  if (/* Within text portion of the window.  */
      portion == 0
      && EQ (w->window_end_valid, w->buffer)
      && XFASTINT (w->last_modified) == BUF_MODIFF (XBUFFER (w->buffer))
      && (XFASTINT (w->last_overlay_modified)
          == BUF_OVERLAY_MODIFF (XBUFFER (w->buffer))))
    {
      int hpos, vpos, pos, i, area;
      struct glyph *glyph;

      /* Find the glyph under X/Y.  */
      glyph = x_y_to_hpos_vpos (w, x, y, &hpos, &vpos, &area);

      /* Clear mouse face if X/Y not over text.  */
      if (glyph == NULL
          || area != TEXT_AREA
          || !MATRIX_ROW (w->current_matrix, vpos)->displays_text_p)
        {
          clear_mouse_face (dpyinfo);
          return;
        }

      pos = glyph->charpos;
      xassert (w->pseudo_window_p || BUFFERP (glyph->object));

      /* Check for mouse-face and help-echo.  */
      {
        Lisp_Object mouse_face, overlay, position;
        Lisp_Object *overlay_vec;
        int len, noverlays;
        struct buffer *obuf;
        int obegv, ozv;

        /* If we get an out-of-range value, return now; avoid an error.  */
        if (pos > BUF_Z (XBUFFER (w->buffer)))
          return;

        /* Make the window's buffer temporarily current for
           overlays_at and compute_char_face.  */
        obuf = current_buffer;
        current_buffer = XBUFFER (w->buffer);
        obegv = BEGV;
        ozv = ZV;
        BEGV = BEG;
        ZV = Z;

        /* Is this char mouse-active or does it have help-echo?  */
        XSETINT (position, pos);

        /* Put all the overlays we want in a vector in overlay_vec.
           Store the length in len.  If there are more than 10, make
           enough space for all, and try again.  */
        len = 10;
        overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
        noverlays = overlays_at (pos, 0, &overlay_vec, &len, NULL, NULL);
        if (noverlays > len)
          {
            len = noverlays;
            overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
            noverlays = overlays_at (pos, 0, &overlay_vec, &len, NULL, NULL);
          }
          
        noverlays = sort_overlays (overlay_vec, noverlays, w);

        /* Check mouse-face highlighting.  */
        if (! (EQ (window, dpyinfo->mouse_face_window)
               && vpos >= dpyinfo->mouse_face_beg_row
               && vpos <= dpyinfo->mouse_face_end_row
               && (vpos > dpyinfo->mouse_face_beg_row
                   || hpos >= dpyinfo->mouse_face_beg_col)
               && (vpos < dpyinfo->mouse_face_end_row
                   || hpos < dpyinfo->mouse_face_end_col
                   || dpyinfo->mouse_face_past_end)))
          {
            /* Clear the display of the old active region, if any.  */
            clear_mouse_face (dpyinfo);

            /* Find the highest priority overlay that has a mouse-face prop.  */
            overlay = Qnil;
            for (i = 0; i < noverlays; i++)
              {
                mouse_face = Foverlay_get (overlay_vec[i], Qmouse_face);
                if (!NILP (mouse_face))
                  {
                    overlay = overlay_vec[i];
                    break;
                  }
              }

            /* If no overlay applies, get a text property.  */
            if (NILP (overlay))
              mouse_face = Fget_text_property (position, Qmouse_face, w->buffer);

            /* Handle the overlay case.  */
            if (! NILP (overlay))
              {
                /* Find the range of text around this char that
                   should be active.  */
                Lisp_Object before, after;
                int ignore;

                before = Foverlay_start (overlay);
                after = Foverlay_end (overlay);
                /* Record this as the current active region.  */
                fast_find_position (w, XFASTINT (before),
                                    &dpyinfo->mouse_face_beg_col,
                                    &dpyinfo->mouse_face_beg_row,
                                    &dpyinfo->mouse_face_beg_x,
                                    &dpyinfo->mouse_face_beg_y);
                dpyinfo->mouse_face_past_end
                  = !fast_find_position (w, XFASTINT (after),
                                         &dpyinfo->mouse_face_end_col,
                                         &dpyinfo->mouse_face_end_row,
                                         &dpyinfo->mouse_face_end_x,
                                         &dpyinfo->mouse_face_end_y);
                dpyinfo->mouse_face_window = window;
                dpyinfo->mouse_face_face_id
                  = face_at_buffer_position (w, pos, 0, 0,
                                             &ignore, pos + 1, 1);

                /* Display it as active.  */
                show_mouse_face (dpyinfo, DRAW_MOUSE_FACE);
              }
            /* Handle the text property case.  */
            else if (! NILP (mouse_face))
              {
                /* Find the range of text around this char that
                   should be active.  */
                Lisp_Object before, after, beginning, end;
                int ignore;

                beginning = Fmarker_position (w->start);
                XSETINT (end, (BUF_Z (XBUFFER (w->buffer))
                               - XFASTINT (w->window_end_pos)));
                before
                  = Fprevious_single_property_change (make_number (pos + 1),
                                                      Qmouse_face,
                                                      w->buffer, beginning);
                after
                  = Fnext_single_property_change (position, Qmouse_face,
                                                  w->buffer, end);
                /* Record this as the current active region.  */
                fast_find_position (w, XFASTINT (before),
                                    &dpyinfo->mouse_face_beg_col,
                                    &dpyinfo->mouse_face_beg_row,
                                    &dpyinfo->mouse_face_beg_x,
                                    &dpyinfo->mouse_face_beg_y);
                dpyinfo->mouse_face_past_end
                  = !fast_find_position (w, XFASTINT (after),
                                         &dpyinfo->mouse_face_end_col,
                                         &dpyinfo->mouse_face_end_row,
                                         &dpyinfo->mouse_face_end_x,
                                         &dpyinfo->mouse_face_end_y);
                dpyinfo->mouse_face_window = window;
                dpyinfo->mouse_face_face_id
                  = face_at_buffer_position (w, pos, 0, 0,
                                             &ignore, pos + 1, 1);

                /* Display it as active.  */
                show_mouse_face (dpyinfo, DRAW_MOUSE_FACE);
              }
          }

        /* Look for a `help-echo' property.  */
        {
          Lisp_Object help;

          /* Check overlays first.  */
          help = Qnil;
          for (i = 0; i < noverlays && !STRINGP (help); ++i)
            help = Foverlay_get (overlay_vec[i], Qhelp_echo); 
            
          /* Try text properties.  */
          if (!STRINGP (help)
              && ((STRINGP (glyph->object)
                   && glyph->charpos >= 0
                   && glyph->charpos < XSTRING (glyph->object)->size)
                  || (BUFFERP (glyph->object)
                      && glyph->charpos >= BEGV
                      && glyph->charpos < ZV)))
            help = Fget_text_property (make_number (glyph->charpos),
                                       Qhelp_echo, glyph->object);
            
          if (STRINGP (help))
            help_echo = help;
        }
          
        BEGV = obegv;
        ZV = ozv;
        current_buffer = obuf;
      }
    }
}

static void
redo_mouse_highlight ()
{
  if (!NILP (last_mouse_motion_frame)
      && FRAME_LIVE_P (XFRAME (last_mouse_motion_frame)))
    note_mouse_highlight (XFRAME (last_mouse_motion_frame),
                          last_mouse_motion_event.x,
                          last_mouse_motion_event.y);
}


\f
/***********************************************************************
                               Toolbars
 ***********************************************************************/

static int x_toolbar_item P_ ((struct frame *, int, int,
                               struct glyph **, int *, int *, int *));

/* Toolbar item index of the item on which a mouse button was pressed
   or -1.  */

static int last_toolbar_item;


/* Get information about the toolbar item at position X/Y on frame F.
   Return in *GLYPH a pointer to the glyph of the toolbar item in
   the current matrix of the toolbar window of F, or NULL if not
   on a toolbar item.  Return in *PROP_IDX the index of the toolbar
   item in F->current_toolbar_items.  Value is

   -1   if X/Y is not on a toolbar item
   0    if X/Y is on the same item that was highlighted before.
   1    otherwise.  */

static int
x_toolbar_item (f, x, y, glyph, hpos, vpos, prop_idx)
     struct frame *f;
     int x, y;
     struct glyph **glyph;
     int *hpos, *vpos, *prop_idx;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  struct window *w = XWINDOW (f->toolbar_window);
  int area;

  /* Find the glyph under X/Y.  */
  *glyph = x_y_to_hpos_vpos (w, x, y, hpos, vpos, &area);
  if (*glyph == NULL)
    return -1;

  /* Get the start of this toolbar item's properties in
     f->current_toolbar_items.  */
  if (!toolbar_item_info (f, *glyph, prop_idx))
    return -1;

  /* Is mouse on the highlighted item?  */
  if (EQ (f->toolbar_window, dpyinfo->mouse_face_window)
      && *vpos >= dpyinfo->mouse_face_beg_row
      && *vpos <= dpyinfo->mouse_face_end_row
      && (*vpos > dpyinfo->mouse_face_beg_row
          || *hpos >= dpyinfo->mouse_face_beg_col)
      && (*vpos < dpyinfo->mouse_face_end_row
          || *hpos < dpyinfo->mouse_face_end_col
          || dpyinfo->mouse_face_past_end))
    return 0;
  
  return 1;
}


/* Handle mouse button event on the toolbar of frame F, at
   frame-relative coordinates X/Y.  EVENT_TYPE is either ButtionPress
   or ButtonRelase.  */

static void
x_handle_toolbar_click (f, button_event)
     struct frame *f;
     XButtonEvent *button_event;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  struct window *w = XWINDOW (f->toolbar_window);
  int hpos, vpos, prop_idx;
  struct glyph *glyph;
  Lisp_Object enabled_p;
  int x = button_event->x;
  int y = button_event->y;
  
  /* If not on the highlighted toolbar item, return.  */
  frame_to_window_pixel_xy (w, &x, &y);
  if (x_toolbar_item (f, x, y, &glyph, &hpos, &vpos, &prop_idx) != 0)
    return;

  /* If item is disabled, do nothing.  */
  enabled_p = (XVECTOR (f->current_toolbar_items)
               ->contents[prop_idx + TOOLBAR_ITEM_ENABLED_P]);
  if (NILP (enabled_p))
    return;
  
  if (button_event->type == ButtonPress)
    {
      /* Show item in pressed state.  */
      show_mouse_face (dpyinfo, DRAW_IMAGE_SUNKEN);
      dpyinfo->mouse_face_image_state = DRAW_IMAGE_SUNKEN;
      last_toolbar_item = prop_idx;
    }
  else
    {
      Lisp_Object key, frame;
      struct input_event event;

      /* Show item in released state.  */
      show_mouse_face (dpyinfo, DRAW_IMAGE_RAISED);
      dpyinfo->mouse_face_image_state = DRAW_IMAGE_RAISED;

      key = (XVECTOR (f->current_toolbar_items)
             ->contents[prop_idx + TOOLBAR_ITEM_KEY]);

      XSETFRAME (frame, f);
      event.kind = TOOLBAR_EVENT;
      event.frame_or_window = Fcons (frame, Fcons (Qtoolbar, Qnil));
      kbd_buffer_store_event (&event);

      event.kind = TOOLBAR_EVENT;
      event.frame_or_window = Fcons (frame, key);
      event.modifiers = x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO (f),
                                                button_event->state);
      kbd_buffer_store_event (&event);
      last_toolbar_item = -1;
    }
}


/* Possibly highlight a toolbar item on frame F when mouse moves to
   toolbar window-relative coordinates X/Y.  Called from
   note_mouse_highlight.  */

static void
note_toolbar_highlight (f, x, y)
     struct frame *f;
     int x, y;
{
  Lisp_Object window = f->toolbar_window;
  struct window *w = XWINDOW (window);
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int hpos, vpos;
  struct glyph *glyph;
  struct glyph_row *row;
  int i, j, area;
  Lisp_Object enabled_p;
  int prop_idx;
  enum draw_glyphs_face draw = DRAW_IMAGE_RAISED;
  int on_highlight_p, mouse_down_p, rc;

  /* Function note_mouse_highlight is called with negative x(y
     values when mouse moves outside of the frame.  */
  if (x <= 0 || y <= 0)
    {
      clear_mouse_face (dpyinfo);
      return;
    }

  rc = x_toolbar_item (f, x, y, &glyph, &hpos, &vpos, &prop_idx);
  if (rc < 0)
    {
      /* Not on toolbar item.  */
      clear_mouse_face (dpyinfo);
      return;
    }
  else if (rc == 0)
    /* On same toolbar item as before.  */
    goto set_help_echo;

  clear_mouse_face (dpyinfo);
  
  /* Mouse is down, but on different toolbar item?  */
  mouse_down_p = (dpyinfo->grabbed
                  && f == last_mouse_frame
                  && FRAME_LIVE_P (f));
  if (mouse_down_p
      && last_toolbar_item != prop_idx)
    return;

  dpyinfo->mouse_face_image_state = DRAW_NORMAL_TEXT;
  draw = mouse_down_p ? DRAW_IMAGE_SUNKEN : DRAW_IMAGE_RAISED;
  
  /* If toolbar item is not enabled, don't highlight it.  */
  enabled_p = (XVECTOR (f->current_toolbar_items)
               ->contents[prop_idx + TOOLBAR_ITEM_ENABLED_P]);
  if (!NILP (enabled_p))
    {
      /* Compute the x-position of the glyph.  In front and past the
         image is a space.  We include this is the highlighted area.  */
      row = MATRIX_ROW (w->current_matrix, vpos);
      for (i = x = 0; i < hpos; ++i)
        x += row->glyphs[TEXT_AREA][i].pixel_width;
      
      /* Record this as the current active region.  */
      dpyinfo->mouse_face_beg_col = hpos;
      dpyinfo->mouse_face_beg_row = vpos;
      dpyinfo->mouse_face_beg_x = x;
      dpyinfo->mouse_face_beg_y = row->y;
      dpyinfo->mouse_face_past_end = 0;
      
      dpyinfo->mouse_face_end_col = hpos + 1;
      dpyinfo->mouse_face_end_row = vpos;
      dpyinfo->mouse_face_end_x = x + glyph->pixel_width;
      dpyinfo->mouse_face_end_y = row->y;
      dpyinfo->mouse_face_window = window;
      dpyinfo->mouse_face_face_id = TOOLBAR_FACE_ID;
      
      /* Display it as active.  */
      show_mouse_face (dpyinfo, draw);
      dpyinfo->mouse_face_image_state = draw;
    }
      
 set_help_echo:
  
  /* Set help_echo to a help string.to display for this toolbar item.
     XTread_socket does the rest.  */
  help_echo = (XVECTOR (f->current_toolbar_items)
               ->contents[prop_idx + TOOLBAR_ITEM_HELP]);
  if (!STRINGP (help_echo))
    help_echo = (XVECTOR (f->current_toolbar_items)
                 ->contents[prop_idx + TOOLBAR_ITEM_CAPTION]);
}


\f
/* Find the glyph matrix position of buffer position POS in window W.
   *HPOS, *VPOS, *X, and *Y are set to the positions found.  W's
   current glyphs must be up to date.  If POS is above window start
   return (0, 0, 0, 0).  If POS is after end of W, return end of
   last line in W.  */

static int
fast_find_position (w, pos, hpos, vpos, x, y)
     struct window *w;
     int pos;
     int *hpos, *vpos, *x, *y;
{
  int i;
  int lastcol;
  int maybe_next_line_p = 0;
  int line_start_position;
  int yb = window_text_bottom_y (w);
  struct glyph_row *row = MATRIX_ROW (w->current_matrix, 0);
  struct glyph_row *best_row = row;
  int row_vpos = 0, best_row_vpos = 0;
  int current_x;

  while (row->y < yb)
    {
      if (row->used[TEXT_AREA])
        line_start_position = row->glyphs[TEXT_AREA]->charpos;
      else
        line_start_position = 0;

      if (line_start_position > pos)
        break;
      /* If the position sought is the end of the buffer,
         don't include the blank lines at the bottom of the window.  */
      else if (line_start_position == pos
               && pos == BUF_ZV (XBUFFER (w->buffer)))
        {
          maybe_next_line_p = 1;
          break;
        }
      else if (line_start_position > 0)
        {
          best_row = row;
          best_row_vpos = row_vpos;
        }
      
      ++row;
      ++row_vpos;
    }
  
  /* Find the right column within BEST_ROW.  */
  lastcol = 0;
  current_x = best_row->x;
  for (i = 0; i < best_row->used[TEXT_AREA]; i++)
    {
      struct glyph *glyph = best_row->glyphs[TEXT_AREA] + i;
      int charpos;

      charpos = glyph->charpos;
      if (charpos == pos)
        {
          *hpos = i;
          *vpos = best_row_vpos;
          *x = current_x;
          *y = best_row->y;
          return 1;
        }
      else if (charpos > pos)
        break;
      else if (charpos > 0)
        lastcol = i;

      current_x += glyph->pixel_width;
    }

  /* If we're looking for the end of the buffer,
     and we didn't find it in the line we scanned,
     use the start of the following line.  */
  if (maybe_next_line_p)
    {
      ++best_row;
      ++best_row_vpos;
      lastcol = 0;
      current_x = best_row->x;
    }

  *vpos = best_row_vpos;
  *hpos = lastcol + 1;
  *x = current_x;
  *y = best_row->y;
  return 0;
}


/* Display the active region described by mouse_face_*
   in its mouse-face if HL > 0, in its normal face if HL = 0.  */

static void
show_mouse_face (dpyinfo, draw)
     struct x_display_info *dpyinfo;
     enum draw_glyphs_face draw;
{
  struct window *w = XWINDOW (dpyinfo->mouse_face_window);
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  int i;
  int cursor_off_p = 0;
  struct cursor_pos saved_cursor;

  saved_cursor = output_cursor;
  
  /* If window is in the process of being destroyed, don't bother
     to do anything.  */
  if (w->current_matrix == NULL)
    goto set_x_cursor;

  /* Recognize when we are called to operate on rows that don't exist
     anymore.  This can happen when a window is split.  */
  if (dpyinfo->mouse_face_end_row >= w->current_matrix->nrows)
    goto set_x_cursor;

  set_output_cursor (&w->phys_cursor);

  /* Note that mouse_face_beg_row etc. are window relative.  */
  for (i = dpyinfo->mouse_face_beg_row;
       i <= dpyinfo->mouse_face_end_row;
       i++)
    {
      int start_hpos, end_hpos, start_x;
      struct glyph_row *row = MATRIX_ROW (w->current_matrix, i);

      /* Don't do anything if row doesn't have valid contents.  */
      if (!row->enabled_p)
        continue;

      /* For all but the first row, the highlight starts at column 0.  */
      if (i == dpyinfo->mouse_face_beg_row)
        {
          start_hpos = dpyinfo->mouse_face_beg_col;
          start_x = dpyinfo->mouse_face_beg_x;
        }
      else
        {
          start_hpos = 0;
          start_x = 0;
        }

      if (i == dpyinfo->mouse_face_end_row)
        end_hpos = dpyinfo->mouse_face_end_col;
      else
        end_hpos = row->used[TEXT_AREA];

      /* If the cursor's in the text we are about to rewrite, turn the
         cursor off.  */
      if (!w->pseudo_window_p
          && i == output_cursor.vpos
          && output_cursor.hpos >= start_hpos - 1
          && output_cursor.hpos <= end_hpos)
        {
          x_update_window_cursor (w, 0);
          cursor_off_p = 1;
        }

      if (end_hpos > start_hpos)
        x_draw_glyphs (w, start_x, row, updated_area, 
                       start_hpos, end_hpos, draw, NULL, NULL);
    }

  /* If we turned the cursor off, turn it back on.  */
  if (cursor_off_p)
    x_display_cursor (w, 1,
                      output_cursor.hpos, output_cursor.vpos,
                      output_cursor.x, output_cursor.y);

  output_cursor = saved_cursor;

 set_x_cursor:
  
  /* Change the mouse cursor.  */
  if (draw == DRAW_NORMAL_TEXT)
    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                   f->output_data.x->text_cursor);
  else if (draw == DRAW_MOUSE_FACE)
    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                   f->output_data.x->cross_cursor);
  else
    XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                   f->output_data.x->nontext_cursor);
}

/* Clear out the mouse-highlighted active region.
   Redraw it un-highlighted first.  */

void
clear_mouse_face (dpyinfo)
     struct x_display_info *dpyinfo;
{
  if (tip_frame)
    return;
  
  if (! NILP (dpyinfo->mouse_face_window))
    show_mouse_face (dpyinfo, DRAW_NORMAL_TEXT);

  dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
  dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
  dpyinfo->mouse_face_window = Qnil;
}

/* Just discard the mouse face information for frame F, if any.
   This is used when the size of F is changed.  */

void
cancel_mouse_face (f)
     FRAME_PTR f;
{
  Lisp_Object window;
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);

  window = dpyinfo->mouse_face_window;
  if (! NILP (window) && XFRAME (XWINDOW (window)->frame) == f)
    {
      dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
      dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
      dpyinfo->mouse_face_window = Qnil;
    }
}
\f
static struct scroll_bar *x_window_to_scroll_bar ();
static void x_scroll_bar_report_motion ();

/* Return the current position of the mouse.
   *fp should be a frame which indicates which display to ask about.

   If the mouse movement started in a scroll bar, set *fp, *bar_window,
   and *part to the frame, window, and scroll bar part that the mouse
   is over.  Set *x and *y to the portion and whole of the mouse's
   position on the scroll bar.

   If the mouse movement started elsewhere, set *fp to the frame the
   mouse is on, *bar_window to nil, and *x and *y to the character cell
   the mouse is over.

   Set *time to the server time-stamp for the time at which the mouse
   was at this position.

   Don't store anything if we don't have a valid set of values to report.

   This clears the mouse_moved flag, so we can wait for the next mouse
   movement.  */

static void
XTmouse_position (fp, insist, bar_window, part, x, y, time)
     FRAME_PTR *fp;
     int insist;
     Lisp_Object *bar_window;
     enum scroll_bar_part *part;
     Lisp_Object *x, *y;
     unsigned long *time;
{
  FRAME_PTR f1;

  BLOCK_INPUT;

  if (! NILP (last_mouse_scroll_bar) && insist == 0)
    x_scroll_bar_report_motion (fp, bar_window, part, x, y, time);
  else
    {
      Window root;
      int root_x, root_y;

      Window dummy_window;
      int dummy;

      Lisp_Object frame, tail;

      /* Clear the mouse-moved flag for every frame on this display.  */
      FOR_EACH_FRAME (tail, frame)
        if (FRAME_X_DISPLAY (XFRAME (frame)) == FRAME_X_DISPLAY (*fp))
          XFRAME (frame)->mouse_moved = 0;

      last_mouse_scroll_bar = Qnil;

      /* Figure out which root window we're on.  */
      XQueryPointer (FRAME_X_DISPLAY (*fp),
                     DefaultRootWindow (FRAME_X_DISPLAY (*fp)),

                     /* The root window which contains the pointer.  */
                     &root,

                     /* Trash which we can't trust if the pointer is on
                        a different screen.  */
                     &dummy_window,

                     /* The position on that root window.  */
                     &root_x, &root_y,

                     /* More trash we can't trust.  */
                     &dummy, &dummy,

                     /* Modifier keys and pointer buttons, about which
                        we don't care.  */
                     (unsigned int *) &dummy);

      /* Now we have a position on the root; find the innermost window
         containing the pointer.  */
      {
        Window win, child;
        int win_x, win_y;
        int parent_x = 0, parent_y = 0;
        int count;

        win = root;

        /* XTranslateCoordinates can get errors if the window
           structure is changing at the same time this function
           is running.  So at least we must not crash from them.  */

        count = x_catch_errors (FRAME_X_DISPLAY (*fp));

        if (FRAME_X_DISPLAY_INFO (*fp)->grabbed && last_mouse_frame
            && FRAME_LIVE_P (last_mouse_frame))
          {
            /* If mouse was grabbed on a frame, give coords for that frame
               even if the mouse is now outside it.  */
            XTranslateCoordinates (FRAME_X_DISPLAY (*fp),

                                   /* From-window, to-window.  */
                                   root, FRAME_X_WINDOW (last_mouse_frame),

                                   /* From-position, to-position.  */
                                   root_x, root_y, &win_x, &win_y,

                                   /* Child of win.  */
                                   &child);
            f1 = last_mouse_frame;
          }
        else
          {
            while (1)
              {
                XTranslateCoordinates (FRAME_X_DISPLAY (*fp),

                                       /* From-window, to-window.  */
                                       root, win,

                                       /* From-position, to-position.  */
                                       root_x, root_y, &win_x, &win_y,

                                       /* Child of win.  */
                                       &child);

                if (child == None || child == win)
                  break;

                win = child;
                parent_x = win_x;
                parent_y = win_y;
              }

            /* Now we know that:
               win is the innermost window containing the pointer
               (XTC says it has no child containing the pointer),
               win_x and win_y are the pointer's position in it
               (XTC did this the last time through), and
               parent_x and parent_y are the pointer's position in win's parent.
               (They are what win_x and win_y were when win was child.
               If win is the root window, it has no parent, and
               parent_{x,y} are invalid, but that's okay, because we'll
               never use them in that case.)  */

            /* Is win one of our frames?  */
            f1 = x_any_window_to_frame (FRAME_X_DISPLAY_INFO (*fp), win);
          }

        if (x_had_errors_p (FRAME_X_DISPLAY (*fp)))
          f1 = 0;

        x_uncatch_errors (FRAME_X_DISPLAY (*fp), count);

        /* If not, is it one of our scroll bars?  */
        if (! f1)
          {
            struct scroll_bar *bar = x_window_to_scroll_bar (win);

            if (bar)
              {
                f1 = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
                win_x = parent_x;
                win_y = parent_y;
              }
          }

        if (f1 == 0 && insist > 0)
          f1 = selected_frame;

        if (f1)
          {
            /* Ok, we found a frame.  Store all the values.
               last_mouse_glyph is a rectangle used to reduce the
               generation of mouse events.  To not miss any motion
               events, we must divide the frame into rectangles of the
               size of the smallest character that could be displayed
               on it, i.e. into the same rectangles that matrices on
               the frame are divided into.  */

#if OLD_REDISPLAY_CODE
            int ignore1, ignore2;
            pixel_to_glyph_coords (f1, win_x, win_y, &ignore1, &ignore2,
                                   &last_mouse_glyph,
                                   FRAME_X_DISPLAY_INFO (f1)->grabbed
                                   || insist);
#else
            {
              int width = FRAME_SMALLEST_CHAR_WIDTH (f1);
              int height = FRAME_SMALLEST_FONT_HEIGHT (f1);
              int x = win_x;
              int y = win_y;
              
              /* Arrange for the division in PIXEL_TO_CHAR_COL etc. to
                 round down even for negative values.  */
              if (x < 0)
                x -= width - 1;
              if (y < 0)
                y -= height - 1;
              
              last_mouse_glyph.width  = width;
              last_mouse_glyph.height = height;
              last_mouse_glyph.x = (x + width - 1) / width * width;
              last_mouse_glyph.y = (y + height - 1) / height * height;
            }
#endif

            *bar_window = Qnil;
            *part = 0;
            *fp = f1;
            XSETINT (*x, win_x);
            XSETINT (*y, win_y);
            *time = last_mouse_movement_time;
          }
      }
    }

  UNBLOCK_INPUT;
}


DEFUN ("xt-process-timeouts", Fxt_process_timeouts, Sxt_process_timeouts,
       0, 0, 0,
  "Arrange for Xt timeout callbacks to be called.")
  ()
{
#ifdef USE_X_TOOLKIT
  BLOCK_INPUT;
  while (XtAppPending (Xt_app_con) & XtIMTimer)
    XtAppProcessEvent (Xt_app_con, XtIMTimer);
  UNBLOCK_INPUT;
#endif /* USE_X_TOOLKIT */
  
  return Qnil;
}


\f
/* Scroll bar support.  */

/* Given an X window ID, find the struct scroll_bar which manages it.
   This can be called in GC, so we have to make sure to strip off mark
   bits.  */
static struct scroll_bar *
x_window_to_scroll_bar (window_id)
     Window window_id;
{
  Lisp_Object tail;

  for (tail = Vframe_list;
       XGCTYPE (tail) == Lisp_Cons;
       tail = XCONS (tail)->cdr)
    {
      Lisp_Object frame, bar, condemned;

      frame = XCONS (tail)->car;
      /* All elements of Vframe_list should be frames.  */
      if (! GC_FRAMEP (frame))
        abort ();

      /* Scan this frame's scroll bar list for a scroll bar with the
         right window ID.  */
      condemned = FRAME_CONDEMNED_SCROLL_BARS (XFRAME (frame));
      for (bar = FRAME_SCROLL_BARS (XFRAME (frame));
           /* This trick allows us to search both the ordinary and
              condemned scroll bar lists with one loop.  */
           ! GC_NILP (bar) || (bar = condemned,
                               condemned = Qnil,
                               ! GC_NILP (bar));
           bar = XSCROLL_BAR (bar)->next)
        if (SCROLL_BAR_X_WINDOW (XSCROLL_BAR (bar)) == window_id)
          return XSCROLL_BAR (bar);
    }

  return 0;
}


\f
/************************************************************************
                         Toolkit scroll bars
 ************************************************************************/

#if USE_TOOLKIT_SCROLL_BARS

static void x_scroll_bar_to_input_event P_ ((XEvent *, struct input_event *));
static void x_send_scroll_bar_event P_ ((Lisp_Object, int, int, int));
static void x_create_toolkit_scroll_bar P_ ((struct frame *,
                                             struct scroll_bar *));
static void x_set_toolkit_scroll_bar_thumb P_ ((struct scroll_bar *,
                                                int, int, int));


/* Id of action hook installed for scroll bars.  */

static XtActionHookId action_hook_id;

/* Lisp window being scrolled.  Set when starting to interact with
   a toolkit scroll bar, reset to nil when ending the interaction.  */

static Lisp_Object window_being_scrolled;

/* Last scroll bar part sent in xm_scroll_callback.  */

static int last_scroll_bar_part;


/* Action hook installed via XtAppAddActionHook when toolkit scroll
   bars are used..  The hoos is responsible for detecting when
   the user ends an interaction with the scroll bar, and generates
   a `end-scroll' scroll_bar_click' event if so.  */

static void
xt_action_hook (widget, client_data, action_name, event, params,
                num_params)
     Widget widget;
     XtPointer client_data;
     String action_name;
     XEvent *event;
     String *params;
     Cardinal *num_params;
{
  int scroll_bar_p;
  char *end_action;
  
#ifdef USE_MOTIF
  scroll_bar_p = XmIsScrollBar (widget);
  end_action = "Release";
#elif defined HAVE_XAW3D
  scroll_bar_p = XtIsSubclass (widget, scrollbarWidgetClass);
  end_action = "EndScroll";
#else
#error unknown scroll bar toolkit
#endif /* HAVE_XAW3D */

  /* Although LessTif uses XtTimeouts like Xaw3d, the timer hack to
     let Xt timeouts be processed doesn't work.  */
  if (scroll_bar_p
      && strcmp (action_name, end_action) == 0
      && WINDOWP (window_being_scrolled))
    {
      struct window *w;
      
      x_send_scroll_bar_event (window_being_scrolled,
                               scroll_bar_end_scroll, 0, 0);
      w = XWINDOW (window_being_scrolled);
      XSCROLL_BAR (w->vertical_scroll_bar)->dragging = Qnil;
      window_being_scrolled = Qnil;
      last_scroll_bar_part = -1;
    }
}


/* Send a client message with message type Xatom_Scrollbar for a
   scroll action to the frame of WINDOW.  PART is a value identifying
   the part of the scroll bar that was clicked on.  PORTION is the
   amount to scroll of a whole of WHOLE.  */

static void
x_send_scroll_bar_event (window, part, portion, whole)
     Lisp_Object window;
     int part, portion, whole;
{
  XEvent event;
  XClientMessageEvent *ev = (XClientMessageEvent *) &event;
  struct frame *f = XFRAME (XWINDOW (window)->frame);

  /* Construct a ClientMessage event to send to the frame.  */
  ev->type = ClientMessage;
  ev->message_type = FRAME_X_DISPLAY_INFO (f)->Xatom_Scrollbar;
  ev->display = FRAME_X_DISPLAY (f);
  ev->window = FRAME_X_WINDOW (f);
  ev->format = 32;
  ev->data.l[0] = (long) window;
  ev->data.l[1] = (long) part;
  ev->data.l[2] = (long) 0;
  ev->data.l[3] = (long) portion;
  ev->data.l[4] = (long) whole;

  /* Setting the event mask to zero means that the message will
     be sent to the client that created the window, and if that
     window no longer exists, no event will be sent.  */
  BLOCK_INPUT;
  XSendEvent (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), False, 0, &event);
  UNBLOCK_INPUT;
}


/* Transform a scroll bar ClientMessage EVENT to an Emacs input event
   in *IEVENT.  */

static void
x_scroll_bar_to_input_event (event, ievent)
     XEvent *event;
     struct input_event *ievent;
{
  XClientMessageEvent *ev = (XClientMessageEvent *) event;
  Lisp_Object window = (Lisp_Object) ev->data.l[0];
  struct frame *f = XFRAME (XWINDOW (window)->frame);
  
  ievent->kind = scroll_bar_click;
  ievent->frame_or_window = window;
  ievent->timestamp = XtLastTimestampProcessed (FRAME_X_DISPLAY (f));
  ievent->part = ev->data.l[1];
  ievent->code = ev->data.l[2];
  ievent->x = make_number ((int) ev->data.l[3]);
  ievent->y = make_number ((int) ev->data.l[4]);
  ievent->modifiers = 0;
}


#ifdef USE_MOTIF

/* Minimum and maximum values used for Motif scroll bars.  */

#define XM_SB_MIN 1
#define XM_SB_MAX 10000000
#define XM_SB_RANGE (XM_SB_MAX - XM_SB_MIN)


/* Scroll bar callback for Motif scroll bars.  WIDGET is the scroll
   bar widget.  CLIENT_DATA is a pointer to the scroll_bar structure.
   CALL_DATA is a pointer a a XmScrollBarCallbackStruct.  */

static void
xm_scroll_callback (widget, client_data, call_data)
     Widget widget;
     XtPointer client_data, call_data;
{
  struct scroll_bar *bar = (struct scroll_bar *) client_data;
  XmScrollBarCallbackStruct *cs = (XmScrollBarCallbackStruct *) call_data;
  double percent;
  int part = -1, whole = 0, portion = 0;

  switch (cs->reason)
    {
    case XmCR_DECREMENT:
      bar->dragging = Qnil;
      part = scroll_bar_up_arrow;
      break;

    case XmCR_INCREMENT:
      bar->dragging = Qnil;
      part = scroll_bar_down_arrow;
      break;

    case XmCR_PAGE_DECREMENT:
      bar->dragging = Qnil;
      part = scroll_bar_above_handle;
      break;

    case XmCR_PAGE_INCREMENT:
      bar->dragging = Qnil;
      part = scroll_bar_below_handle;
      break;

    case XmCR_TO_TOP:
      bar->dragging = Qnil;
      part = scroll_bar_to_top;
      break;
      
    case XmCR_TO_BOTTOM:
      bar->dragging = Qnil;
      part = scroll_bar_to_bottom;
      break;

    case XmCR_DRAG:
      {
        int slider_size;
        int dragging_down_p = (INTEGERP (bar->dragging)
                               && XINT (bar->dragging) <= cs->value);

        /* Get the slider size.  */
        BLOCK_INPUT;
        XtVaGetValues (widget, XmNsliderSize, &slider_size, NULL);
        UNBLOCK_INPUT;

        /* At the max position of the scroll bar, do a line-wise
           movement.  Without doing anything, the LessTif scroll bar
           calls us with the same cs->value again and again.  If we
           want to make sure that we can reach the end of the buffer,
           we have to do something.

           Implementation note: setting bar->dragging always to
           cs->value gives a smoother movement at the max position.
           Setting it to nil when doing line-wise movement gives
           a better slider behavior. */
        
        if (cs->value + slider_size == XM_SB_MAX
            || (dragging_down_p
                && last_scroll_bar_part == scroll_bar_down_arrow))
          {
            part = scroll_bar_down_arrow;
            bar->dragging = Qnil;
          }
        else
          {
            whole = XM_SB_RANGE;
            portion = min (cs->value - XM_SB_MIN, XM_SB_MAX - slider_size);
            part = scroll_bar_handle;
            bar->dragging = make_number (cs->value);
          }
      }
      break;
      
    case XmCR_VALUE_CHANGED:
      break;
    };

  if (part >= 0)
    {
      window_being_scrolled = bar->window;
      last_scroll_bar_part = part;
      x_send_scroll_bar_event (bar->window, part, portion, whole);
    }
}


#else /* not USE_MOTIF, i.e. XAW3D.  */


/* Xaw3d scroll bar callback.  Invoked when the thumb is dragged.
   WIDGET is the scroll bar widget.  CLIENT_DATA is a pointer to the
   scroll bar struct.  CALL_DATA is a pointer to a float saying where
   the thumb is.  */

static void
xaw3d_jump_callback (widget, client_data, call_data)
     Widget widget;
     XtPointer client_data, call_data;
{
  struct scroll_bar *bar = (struct scroll_bar *) client_data;
  float top = *(float *) call_data;
  float shown;
  int whole, portion;
  int dragging_down_p, part;
  double epsilon = 0.01;

  /* Get the size of the thumb, a value between 0 and 1.  */
  BLOCK_INPUT;
  XtVaGetValues (widget, XtNshown, &shown, NULL);
  UNBLOCK_INPUT;

  whole = 10000000;
  portion = shown < 1 ? top * whole : 0;
  dragging_down_p = (INTEGERP (bar->dragging)
                     && XINT (bar->dragging) < portion);

  if (shown < 1
      && (abs (top + shown - 1) < epsilon
          || (dragging_down_p
              && last_scroll_bar_part == scroll_bar_down_arrow)))
    part = scroll_bar_down_arrow;
  else
    part = scroll_bar_handle;

  window_being_scrolled = bar->window;
  bar->dragging = make_number (portion);
  last_scroll_bar_part = part;
  x_send_scroll_bar_event (bar->window, part, portion, whole);
}


/* Xaw3d scroll bar callback.  Invoked for incremental scrolling.,
   i.e. line or page up or down.  WIDGET is the Xaw3d scroll bar
   widget.  CLIENT_DATA is a pointer to the scroll_bar structure for
   the scroll bar.  CALL_DATA is an integer specifying the action that
   has taken place.  It's magnitude is in the range 0..height of the
   scroll bar.  Negative values mean scroll towards buffer start.
   Values < height of scroll bar mean line-wise movement.  */

static void
xaw3d_scroll_callback (widget, client_data, call_data)
     Widget widget;
     XtPointer client_data, call_data;
{
  struct scroll_bar *bar = (struct scroll_bar *) client_data;
  int position = (int) call_data;
  Dimension height;
  int part;

  /* Get the height of the scroll bar.  */
  BLOCK_INPUT;
  XtVaGetValues (widget, XtNheight, &height, NULL);
  UNBLOCK_INPUT;

  if (position < 0)
    {
      if (abs (position) < height)
        part = scroll_bar_up_arrow;
      else
        part = scroll_bar_above_handle;
    }
  else
    {
      if (abs (position) < height)
        part = scroll_bar_down_arrow;
      else
        part = scroll_bar_below_handle;
    }

  window_being_scrolled = bar->window;
  bar->dragging = Qnil;
  last_scroll_bar_part = part;
  x_send_scroll_bar_event (bar->window, part, 0, 0);
}


#endif /* not USE_MOTIF */


/* Create the widget for scroll bar BAR on frame F.  Record the widget
   and X window of the scroll bar in BAR.  */

static void
x_create_toolkit_scroll_bar (f, bar)
     struct frame *f;
     struct scroll_bar *bar;
{
  Window xwindow;
  Widget widget;
  Arg av[20];
  int ac = 0;
  char *scroll_bar_name = "verticalScrollBar";
  unsigned long pixel;

  BLOCK_INPUT;

#ifdef USE_MOTIF
  /* LessTif 0.85, problems:

     1. When the mouse if over the scroll bar, the scroll bar will
     get keyboard events.  I didn't find a way to turn this off.

     2. Do we have to explicitly set the cursor to get an arrow
     cursor (see below)?  */
  
  /* Set resources.  Create the widget.  */
  XtSetArg (av[ac], XtNmappedWhenManaged, False); ++ac;
  XtSetArg (av[ac], XmNminimum, XM_SB_MIN); ++ac;
  XtSetArg (av[ac], XmNmaximum, XM_SB_MAX); ++ac;
  XtSetArg (av[ac], XmNorientation, XmVERTICAL); ++ac;
  XtSetArg (av[ac], XmNprocessingDirection, XmMAX_ON_BOTTOM), ++ac;
  XtSetArg (av[ac], XmNincrement, 1); ++ac;
  XtSetArg (av[ac], XmNpageIncrement, 1); ++ac;

  pixel = f->output_data.x->scroll_bar_foreground_pixel;
  if (pixel != -1)
    {
      XtSetArg (av[ac], XmNforeground, pixel);
      ++ac;
    }
  
  pixel = f->output_data.x->scroll_bar_background_pixel;
  if (pixel != -1)
    {
      XtSetArg (av[ac], XmNbackground, pixel);
      ++ac;
    }
  
  widget = XmCreateScrollBar (f->output_data.x->edit_widget,
                              scroll_bar_name, av, ac);

  /* Add one callback for everything that can happen.  */
  XtAddCallback (widget, XmNdecrementCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNdragCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNincrementCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNpageDecrementCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNpageIncrementCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNtoBottomCallback, xm_scroll_callback,
                 (XtPointer) bar);
  XtAddCallback (widget, XmNtoTopCallback, xm_scroll_callback,
                 (XtPointer) bar);
  
  /* Realize the widget.  Only after that is the X window created.  */
  XtRealizeWidget (widget);

  /* Set the cursor to an arrow.  I didn't find a resource to do that.
     And I'm wondering why it hasn't an arrow cursor by default.  */
  XDefineCursor (XtDisplay (widget), XtWindow (widget),
                 f->output_data.x->nontext_cursor);
  
#elif defined HAVE_XAW3D
  
  /* Set resources.  Create the widget.  The background of the
     Xaw3d scroll bar widget is a little bit light for my taste.
     We don't alter it here to let users change it according
     to their taste with `emacs*verticalScrollBar.background: xxx'.  */
  XtSetArg (av[ac], XtNmappedWhenManaged, False); ++ac;
  XtSetArg (av[ac], XtNorientation, XtorientVertical); ++ac;
  XtSetArg (av[ac], XtNcursorName, "left_ptr"); ++ac;
  XtSetArg (av[ac], XtNbeNiceToColormap, True); ++ac;
  
  pixel = f->output_data.x->scroll_bar_foreground_pixel;
  if (pixel != -1)
    {
      XtSetArg (av[ac], XtNforeground, pixel);
      ++ac;
    }
  
  pixel = f->output_data.x->scroll_bar_background_pixel;
  if (pixel != -1)
    {
      XtSetArg (av[ac], XtNbackground, pixel);
      ++ac;
    }
  
  widget = XtCreateWidget (scroll_bar_name, scrollbarWidgetClass,
                           f->output_data.x->edit_widget, av, ac);
  
  /* Define callbacks.  */
  XtAddCallback (widget, XtNjumpProc, xaw3d_jump_callback, (XtPointer) bar);
  XtAddCallback (widget, XtNscrollProc, xaw3d_scroll_callback,
                 (XtPointer) bar);
  
  /* Realize the widget.  Only after that is the X window created.  */
  XtRealizeWidget (widget);
  
#endif /* HAVE_XAW3D */

  /* Install an action hook that let's us detect when the user
     finishes interacting with a scroll bar.  */
  if (action_hook_id == 0)
    action_hook_id = XtAppAddActionHook (Xt_app_con, xt_action_hook, 0);
  
  /* Remember X window and widget in the scroll bar vector.  */
  SET_SCROLL_BAR_X_WIDGET (bar, widget);
  xwindow = XtWindow (widget);
  SET_SCROLL_BAR_X_WINDOW (bar, xwindow);

  UNBLOCK_INPUT;
}


/* Set the thumb size and position of scroll bar BAR.  We are currently
   displaying PORTION out of a whole WHOLE, and our position POSITION.  */

static void
x_set_toolkit_scroll_bar_thumb (bar, portion, position, whole)
     struct scroll_bar *bar;
     int portion, position, whole;
{
  float top, shown;
  Arg av[2];
  Widget widget = SCROLL_BAR_X_WIDGET (bar);

  if (whole == 0)
    top = 0, shown = 1;
  else
    {
      top = (float) position / whole;
      shown = (float) portion / whole;
    }

  BLOCK_INPUT;

#ifdef USE_MOTIF
  {
    int size, value;
    Boolean arrow1_selected, arrow2_selected;
    unsigned char flags;
    XmScrollBarWidget sb;

    /* Slider size.  Must be in the range [1 .. MAX - MIN] where NAX
       is the scroll bar's maximum and MIN is the scroll bar's minimum
       value.  */
    size = shown * XM_SB_RANGE;
    size = min (size, XM_SB_RANGE);
    size = max (size, 1);

    /* Position.  Must be in the range [MIN .. MAX - SLIDER_SIZE].  */
    value = top * XM_SB_RANGE;
    value = min (value, XM_SB_MAX - size);
    value = max (value, XM_SB_MIN);

    /* LessTif: Calling XmScrollBarSetValues after an increment or
       decrement turns off auto-repeat LessTif-internally.  This can
       be seen in ScrollBar.c which resets Arrow1Selected and
       Arrow2Selected.  It also sets internal flags so that LessTif
       believes the mouse is in the slider.  We either have to change
       our code, or work around that by accessing private data. */

    sb = (XmScrollBarWidget) widget;
    arrow1_selected = sb->scrollBar.arrow1_selected;
    arrow2_selected = sb->scrollBar.arrow2_selected;
    flags = sb->scrollBar.flags;
    
    if (NILP (bar->dragging))
      XmScrollBarSetValues (widget, value, size, 0, 0, False);
    else if (last_scroll_bar_part == scroll_bar_down_arrow)
      /* This has the negative side effect that the slider value is
         not would it would be if we scrolled here using line-wise or
         page-wise movement.  */
      XmScrollBarSetValues (widget, value, XM_SB_RANGE - value, 0, 0, False);
    else
      {
        /* If currently dragging, only update the slider size.
           This reduces flicker effects.  */
        int old_value, old_size, increment, page_increment;
        
        XmScrollBarGetValues (widget, &old_value, &old_size,
                              &increment, &page_increment);
        XmScrollBarSetValues (widget, old_value,
                              min (size, XM_SB_RANGE - old_value),
                              0, 0, False);
      }
    
    sb->scrollBar.arrow1_selected = arrow1_selected;
    sb->scrollBar.arrow2_selected = arrow2_selected;
    sb->scrollBar.flags = flags;
  }
#elif defined HAVE_XAW3D
  {
    /* Restrict to [0 1].  */
    top = max (0, min (1, top));
    shown = max (0, min (1, shown));

    /* If the call to XawScrollbarSetThumb below doesn't seem to work,
       check that your system's configuration file contains a define
       for `NARROWPROTO'.  See s/freebsd.h for an example.  */
    if (NILP (bar->dragging))
      XawScrollbarSetThumb (widget, top, shown);
    else
      {
        ScrollbarWidget sb = (ScrollbarWidget) widget;
        int scroll_mode = sb->scrollbar.scroll_mode;

        sb->scrollbar.scroll_mode = 0;
        
        if (last_scroll_bar_part == scroll_bar_down_arrow)
          XawScrollbarSetThumb (widget, top, 1 - top);
        else
          {
            float old_top;
            XtVaGetValues (widget, XtNtopOfThumb, &old_top, NULL);
            XawScrollbarSetThumb (widget, old_top, min (shown, 1 - old_top));
          }
        
        sb->scrollbar.scroll_mode = scroll_mode;
      }
  }
#endif /* HAVE_XAW3D */

  UNBLOCK_INPUT;
}

#endif /* USE_TOOLKIT_SCROLL_BARS */


\f
/************************************************************************
                         Scroll bars, general
 ************************************************************************/
                                                                         
/* Create a scroll bar and return the scroll bar vector for it.  W is
   the Emacs window on which to create the scroll bar. TOP, LEFT,
   WIDTH and HEIGHT are.the pixel coordinates and dimensions of the
   scroll bar. */

static struct scroll_bar *
x_scroll_bar_create (w, top, left, width, height)
     struct window *w;
     int top, left, width, height;
{
  struct frame *f = XFRAME (w->frame);
#ifdef USE_X_TOOLKIT
  Arg av[10];
#endif
  int ac = 0;
  Window window;
  struct scroll_bar *bar
    = XSCROLL_BAR (Fmake_vector (make_number (SCROLL_BAR_VEC_SIZE), Qnil));

  BLOCK_INPUT;

#if USE_TOOLKIT_SCROLL_BARS
  x_create_toolkit_scroll_bar (f, bar);
#else /* not USE_TOOLKIT_SCROLL_BARS */
  {
    XSetWindowAttributes a;
    unsigned long mask;

    a.background_pixel = f->output_data.x->scroll_bar_background_pixel;
    if (a.background_pixel == -1)
      a.background_pixel = f->output_data.x->background_pixel;
    
    a.event_mask = (ButtonPressMask | ButtonReleaseMask
                    | ButtonMotionMask | PointerMotionHintMask
                    | ExposureMask);
    a.cursor = FRAME_X_DISPLAY_INFO (f)->vertical_scroll_bar_cursor;

    mask = (CWBackPixel | CWEventMask | CWCursor);

    /* Clear the area of W that will serve as a scroll bar.  This is
       for the case that a window has been split horizontally.  In
       this case, no clear_frame is generated to reduce flickering.  */
    XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                left, top, width,
                window_box_height (w), False);

    window = XCreateWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                            /* Position and size of scroll bar.  */
                            left + VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                            top,
                            width - VERTICAL_SCROLL_BAR_WIDTH_TRIM * 2,
                            height,
                            /* Border width, depth, class, and visual.  */
                             0,
                            CopyFromParent,
                            CopyFromParent,
                            CopyFromParent,
                             /* Attributes.  */
                            mask, &a);
    SET_SCROLL_BAR_X_WINDOW (bar, window);
  }
#endif /* not USE_TOOLKIT_SCROLL_BARS */

  XSETWINDOW (bar->window, w);
  XSETINT (bar->top, top);
  XSETINT (bar->left, left);
  XSETINT (bar->width, width);
  XSETINT (bar->height, height);
  XSETINT (bar->start, 0);
  XSETINT (bar->end, 0);
  bar->dragging = Qnil;

  /* Add bar to its frame's list of scroll bars.  */
  bar->next = FRAME_SCROLL_BARS (f);
  bar->prev = Qnil;
  XSETVECTOR (FRAME_SCROLL_BARS (f), bar);
  if (!NILP (bar->next))
    XSETVECTOR (XSCROLL_BAR (bar->next)->prev, bar);

  /* Map the window/widget.  */
#if USE_TOOLKIT_SCROLL_BARS
  XtMapWidget (SCROLL_BAR_X_WIDGET (bar));
  XtConfigureWidget (SCROLL_BAR_X_WIDGET (bar),
                     left + VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                     top,
                     width - VERTICAL_SCROLL_BAR_WIDTH_TRIM * 2,
                     height, 0);
#else /* not USE_TOOLKIT_SCROLL_BARS */
  XMapRaised (FRAME_X_DISPLAY (f), SCROLL_BAR_X_WINDOW (bar));
#endif /* not USE_TOOLKIT_SCROLL_BARS */

  UNBLOCK_INPUT;
  return bar;
}


/* Draw BAR's handle in the proper position.
   
   If the handle is already drawn from START to END, don't bother
   redrawing it, unless REBUILD is non-zero; in that case, always
   redraw it.  (REBUILD is handy for drawing the handle after expose
   events.)

   Normally, we want to constrain the start and end of the handle to
   fit inside its rectangle, but if the user is dragging the scroll
   bar handle, we want to let them drag it down all the way, so that
   the bar's top is as far down as it goes; otherwise, there's no way
   to move to the very end of the buffer.  */

static void
x_scroll_bar_set_handle (bar, start, end, rebuild)
     struct scroll_bar *bar;
     int start, end;
     int rebuild;
{
#ifndef USE_TOOLKIT_SCROLL_BARS
  int dragging = ! NILP (bar->dragging);
  Window w = SCROLL_BAR_X_WINDOW (bar);
  FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
  GC gc = f->output_data.x->normal_gc;

  /* If the display is already accurate, do nothing.  */
  if (! rebuild
      && start == XINT (bar->start)
      && end == XINT (bar->end))
    return;

  BLOCK_INPUT;

  {
    int inside_width = VERTICAL_SCROLL_BAR_INSIDE_WIDTH (f, XINT (bar->width));
    int inside_height = VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (f, XINT (bar->height));
    int top_range = VERTICAL_SCROLL_BAR_TOP_RANGE (f, XINT (bar->height));

    /* Make sure the values are reasonable, and try to preserve
       the distance between start and end.  */
    {
      int length = end - start;

      if (start < 0)
        start = 0;
      else if (start > top_range)
        start = top_range;
      end = start + length;

      if (end < start)
        end = start;
      else if (end > top_range && ! dragging)
        end = top_range;
    }

    /* Store the adjusted setting in the scroll bar.  */
    XSETINT (bar->start, start);
    XSETINT (bar->end, end);

    /* Clip the end position, just for display.  */
    if (end > top_range)
      end = top_range;

    /* Draw bottom positions VERTICAL_SCROLL_BAR_MIN_HANDLE pixels
       below top positions, to make sure the handle is always at least
       that many pixels tall.  */
    end += VERTICAL_SCROLL_BAR_MIN_HANDLE;

    /* Draw the empty space above the handle.  Note that we can't clear
       zero-height areas; that means "clear to end of window."  */
    if (0 < start)
      XClearArea (FRAME_X_DISPLAY (f), w,

                  /* x, y, width, height, and exposures.  */
                  VERTICAL_SCROLL_BAR_LEFT_BORDER,
                  VERTICAL_SCROLL_BAR_TOP_BORDER,
                  inside_width, start,
                  False);

    /* Change to proper foreground color if one is specified.  */
    if (f->output_data.x->scroll_bar_foreground_pixel != -1)
      XSetForeground (FRAME_X_DISPLAY (f), gc,
                      f->output_data.x->scroll_bar_foreground_pixel);

    /* Draw the handle itself.  */
    XFillRectangle (FRAME_X_DISPLAY (f), w, gc,

                    /* x, y, width, height */
                    VERTICAL_SCROLL_BAR_LEFT_BORDER,
                    VERTICAL_SCROLL_BAR_TOP_BORDER + start,
                    inside_width, end - start);

    /* Restore the foreground color of the GC if we changed it above.  */
    if (f->output_data.x->scroll_bar_foreground_pixel != -1)
      XSetForeground (FRAME_X_DISPLAY (f), gc,
                      f->output_data.x->foreground_pixel);

    /* Draw the empty space below the handle.  Note that we can't
       clear zero-height areas; that means "clear to end of window." */
    if (end < inside_height)
      XClearArea (FRAME_X_DISPLAY (f), w,

                  /* x, y, width, height, and exposures.  */
                  VERTICAL_SCROLL_BAR_LEFT_BORDER,
                  VERTICAL_SCROLL_BAR_TOP_BORDER + end,
                  inside_width, inside_height - end,
                  False);

  }

  UNBLOCK_INPUT;
#endif /* not USE_TOOLKIT_SCROLL_BARS */
}


/* Destroy scroll bar BAR, and set its Emacs window's scroll bar to
   nil.  */

static void
x_scroll_bar_remove (bar)
     struct scroll_bar *bar;
{
  FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));

  BLOCK_INPUT;

#if USE_TOOLKIT_SCROLL_BARS
  XtDestroyWidget (SCROLL_BAR_X_WIDGET (bar));
#else /* not USE_TOOLKIT_SCROLL_BARS */
  XDestroyWindow (FRAME_X_DISPLAY (f), SCROLL_BAR_X_WINDOW (bar));
#endif /* not USE_TOOLKIT_SCROLL_BARS */
  
  /* Disassociate this scroll bar from its window.  */
  XWINDOW (bar->window)->vertical_scroll_bar = Qnil;

  UNBLOCK_INPUT;
}


/* Set the handle of the vertical scroll bar for WINDOW to indicate
   that we are displaying PORTION characters out of a total of WHOLE
   characters, starting at POSITION.  If WINDOW has no scroll bar,
   create one.  */

static void
XTset_vertical_scroll_bar (w, portion, whole, position)
     struct window *w;
     int portion, whole, position;
{
  struct frame *f = XFRAME (w->frame);
  struct scroll_bar *bar;
  int pixel_top, pixel_left, pixel_width, pixel_height;
  int window_x, window_y, window_width, window_height;
  int scroll_bar_area_width;

  window_box (w, -1, &window_x, &window_y, &window_width, &window_height);
  
  /* Where should this scroll bar be, pixel-wise?  */
  pixel_top = window_y;
  pixel_height = window_height;

  /* The width of the scroll bar itself.  */
  pixel_width = (FRAME_SCROLL_BAR_PIXEL_WIDTH (f) > 0
                 ? FRAME_SCROLL_BAR_PIXEL_WIDTH (f)
                 : (FRAME_SCROLL_BAR_COLS (f)
                    * FONT_WIDTH (FRAME_FONT (f))));

  /* The width on the screen reserved for the scroll bar plus maybe
     some empty room at both sides of the scroll bar.  */
  scroll_bar_area_width = FRAME_SCROLL_BAR_COLS (f) * CANON_X_UNIT (f);

  if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_RIGHT (f))
    pixel_left = (window_x
                  + window_width
                  + FRAME_FLAGS_AREA_WIDTH (f)
                  + scroll_bar_area_width
                  - pixel_width + 1);
  else
    pixel_left = (window_x
                  - FRAME_FLAGS_AREA_WIDTH (f)
                  - scroll_bar_area_width);

  /* Does the scroll bar exist yet?  */
  if (NILP (w->vertical_scroll_bar))
    bar = x_scroll_bar_create (w, pixel_top, pixel_left, pixel_width,
                               pixel_height);
  else
    {
      /* It may just need to be moved and resized.  */
      unsigned int mask = 0;
      
      bar = XSCROLL_BAR (w->vertical_scroll_bar);

      BLOCK_INPUT;

      if (pixel_left != XINT (bar->left))
        mask |= CWX;
      if (pixel_top != XINT (bar->top))
        mask |= CWY;
      if (pixel_width != XINT (bar->width))
        mask |= CWWidth;
      if (pixel_height != XINT (bar->height))   
        mask |= CWHeight;
      
#ifdef USE_TOOLKIT_SCROLL_BARS
      
      if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_RIGHT (f))
        {
          XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      pixel_left + pixel_width - scroll_bar_area_width,
                      pixel_top,
                      (scroll_bar_area_width
                       - pixel_width
                       + VERTICAL_SCROLL_BAR_WIDTH_TRIM),
                      pixel_height, False);
          XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      (pixel_left
                       + pixel_width
                       - VERTICAL_SCROLL_BAR_WIDTH_TRIM),
                      pixel_top,
                      VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                      pixel_height, False);
        }
      else
        {
          XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      pixel_left, pixel_top,
                      VERTICAL_SCROLL_BAR_WIDTH_TRIM, pixel_height, False);
          XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      (pixel_left
                       + pixel_width
                       - VERTICAL_SCROLL_BAR_WIDTH_TRIM),
                      pixel_top,
                      (scroll_bar_area_width
                       - pixel_width
                       + VERTICAL_SCROLL_BAR_WIDTH_TRIM),
                      pixel_height, False);
        }

      /* Move/size the scroll bar widget.  */
      if (mask)
        XtConfigureWidget (SCROLL_BAR_X_WIDGET (bar),
                           pixel_left + VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                           pixel_top,
                           pixel_width - VERTICAL_SCROLL_BAR_WIDTH_TRIM * 2,
                           pixel_height, 0);

#else /* not USE_TOOLKIT_SCROLL_BARS */
  
      /* Clear areas not covered by the scroll bar.  This makes sure a
         previous mode line display is cleared after C-x 2 C-x 1, for
         example.  Non-toolkit scroll bars are as wide as the area
         reserved for scroll bars - trim at both sides.  */
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                  pixel_left, pixel_top, VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                  pixel_height, False);
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                  (pixel_left
                   + pixel_width
                   - VERTICAL_SCROLL_BAR_WIDTH_TRIM),
                  pixel_top,
                  VERTICAL_SCROLL_BAR_WIDTH_TRIM,
                  pixel_height, False);
      
      /* Move/size the scroll bar window.  */
      if (mask)
        {
          XWindowChanges wc;
          
          wc.x = pixel_left + VERTICAL_SCROLL_BAR_WIDTH_TRIM;
          wc.y = pixel_top;
          wc.width = pixel_width - VERTICAL_SCROLL_BAR_WIDTH_TRIM * 2;
          wc.height = pixel_height;
          XConfigureWindow (FRAME_X_DISPLAY (f), SCROLL_BAR_X_WINDOW (bar),
                            mask, &wc);
        }
  
#endif /* not USE_TOOLKIT_SCROLL_BARS */

      /* Remember new settings.  */
      XSETINT (bar->left, pixel_left);
      XSETINT (bar->top, pixel_top);
      XSETINT (bar->width, pixel_width);
      XSETINT (bar->height, pixel_height);
      
      UNBLOCK_INPUT;
    }

#if USE_TOOLKIT_SCROLL_BARS
  x_set_toolkit_scroll_bar_thumb (bar, portion, position, whole);
#else /* not USE_TOOLKIT_SCROLL_BARS */
  /* Set the scroll bar's current state, unless we're currently being
     dragged.  */
  if (NILP (bar->dragging))
    {
      int top_range = VERTICAL_SCROLL_BAR_TOP_RANGE (f, pixel_height);

      if (whole == 0)
        x_scroll_bar_set_handle (bar, 0, top_range, 0);
      else
        {
          int start = ((double) position * top_range) / whole;
          int end = ((double) (position + portion) * top_range) / whole;
          x_scroll_bar_set_handle (bar, start, end, 0);
        }
    }
#endif /* not USE_TOOLKIT_SCROLL_BARS */

  XSETVECTOR (w->vertical_scroll_bar, bar);
}


/* The following three hooks are used when we're doing a thorough
   redisplay of the frame.  We don't explicitly know which scroll bars
   are going to be deleted, because keeping track of when windows go
   away is a real pain - "Can you say set-window-configuration, boys
   and girls?"  Instead, we just assert at the beginning of redisplay
   that *all* scroll bars are to be removed, and then save a scroll bar
   from the fiery pit when we actually redisplay its window.  */

/* Arrange for all scroll bars on FRAME to be removed at the next call
   to `*judge_scroll_bars_hook'.  A scroll bar may be spared if
   `*redeem_scroll_bar_hook' is applied to its window before the judgment.  */

static void
XTcondemn_scroll_bars (frame)
     FRAME_PTR frame;
{
  /* Transfer all the scroll bars to FRAME_CONDEMNED_SCROLL_BARS.  */
  while (! NILP (FRAME_SCROLL_BARS (frame)))
    {
      Lisp_Object bar;
      bar = FRAME_SCROLL_BARS (frame);
      FRAME_SCROLL_BARS (frame) = XSCROLL_BAR (bar)->next;
      XSCROLL_BAR (bar)->next = FRAME_CONDEMNED_SCROLL_BARS (frame);
      XSCROLL_BAR (bar)->prev = Qnil;
      if (! NILP (FRAME_CONDEMNED_SCROLL_BARS (frame)))
        XSCROLL_BAR (FRAME_CONDEMNED_SCROLL_BARS (frame))->prev = bar;
      FRAME_CONDEMNED_SCROLL_BARS (frame) = bar;
    }
}

/* Un-mark WINDOW's scroll bar for deletion in this judgment cycle.
   Note that WINDOW isn't necessarily condemned at all.  */
static void
XTredeem_scroll_bar (window)
     struct window *window;
{
  struct scroll_bar *bar;

  /* We can't redeem this window's scroll bar if it doesn't have one.  */
  if (NILP (window->vertical_scroll_bar))
    abort ();

  bar = XSCROLL_BAR (window->vertical_scroll_bar);

  /* Unlink it from the condemned list.  */
  {
    FRAME_PTR f = XFRAME (WINDOW_FRAME (window));

    if (NILP (bar->prev))
      {
        /* If the prev pointer is nil, it must be the first in one of
           the lists.  */
        if (EQ (FRAME_SCROLL_BARS (f), window->vertical_scroll_bar))
          /* It's not condemned.  Everything's fine.  */
          return;
        else if (EQ (FRAME_CONDEMNED_SCROLL_BARS (f),
                     window->vertical_scroll_bar))
          FRAME_CONDEMNED_SCROLL_BARS (f) = bar->next;
        else
          /* If its prev pointer is nil, it must be at the front of
             one or the other!  */
          abort ();
      }
    else
      XSCROLL_BAR (bar->prev)->next = bar->next;

    if (! NILP (bar->next))
      XSCROLL_BAR (bar->next)->prev = bar->prev;

    bar->next = FRAME_SCROLL_BARS (f);
    bar->prev = Qnil;
    XSETVECTOR (FRAME_SCROLL_BARS (f), bar);
    if (! NILP (bar->next))
      XSETVECTOR (XSCROLL_BAR (bar->next)->prev, bar);
  }
}

/* Remove all scroll bars on FRAME that haven't been saved since the
   last call to `*condemn_scroll_bars_hook'.  */

static void
XTjudge_scroll_bars (f)
     FRAME_PTR f;
{
  Lisp_Object bar, next;

  bar = FRAME_CONDEMNED_SCROLL_BARS (f);

  /* Clear out the condemned list now so we won't try to process any
     more events on the hapless scroll bars.  */
  FRAME_CONDEMNED_SCROLL_BARS (f) = Qnil;

  for (; ! NILP (bar); bar = next)
    {
      struct scroll_bar *b = XSCROLL_BAR (bar);

      x_scroll_bar_remove (b);

      next = b->next;
      b->next = b->prev = Qnil;
    }

  /* Now there should be no references to the condemned scroll bars,
     and they should get garbage-collected.  */
}


/* Handle an Expose or GraphicsExpose event on a scroll bar.  This
   is a no-op when using toolkit scroll bars.

   This may be called from a signal handler, so we have to ignore GC
   mark bits.  */

static void
x_scroll_bar_expose (bar, event)
     struct scroll_bar *bar;
     XEvent *event;
{
#ifndef USE_TOOLKIT_SCROLL_BARS

  Window w = SCROLL_BAR_X_WINDOW (bar);
  FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
  GC gc = f->output_data.x->normal_gc;
  int width_trim = VERTICAL_SCROLL_BAR_WIDTH_TRIM;

  BLOCK_INPUT;

  x_scroll_bar_set_handle (bar, XINT (bar->start), XINT (bar->end), 1);

  /* Draw a one-pixel border just inside the edges of the scroll bar.  */
  XDrawRectangle (FRAME_X_DISPLAY (f), w, gc,

                  /* x, y, width, height */
                  0, 0,
                  XINT (bar->width) - 1 - width_trim - width_trim,
                  XINT (bar->height) - 1);
    
  UNBLOCK_INPUT;

#endif /* not USE_TOOLKIT_SCROLL_BARS */
}

/* Handle a mouse click on the scroll bar BAR.  If *EMACS_EVENT's kind
   is set to something other than no_event, it is enqueued.

   This may be called from a signal handler, so we have to ignore GC
   mark bits.  */

static void
x_scroll_bar_handle_click (bar, event, emacs_event)
     struct scroll_bar *bar;
     XEvent *event;
     struct input_event *emacs_event;
{
  if (! GC_WINDOWP (bar->window))
    abort ();

  emacs_event->kind = scroll_bar_click;
  emacs_event->code = event->xbutton.button - Button1;
  emacs_event->modifiers
    = (x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO 
                               (XFRAME (WINDOW_FRAME (XWINDOW (bar->window)))),
                               event->xbutton.state)
       | (event->type == ButtonRelease
          ? up_modifier
          : down_modifier));
  emacs_event->frame_or_window = bar->window;
  emacs_event->timestamp = event->xbutton.time;
  {
#if 0
    FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
    int internal_height
      = VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (f, XINT (bar->height));
#endif
    int top_range
      = VERTICAL_SCROLL_BAR_TOP_RANGE (f, XINT (bar->height));
    int y = event->xbutton.y - VERTICAL_SCROLL_BAR_TOP_BORDER;

    if (y < 0) y = 0;
    if (y > top_range) y = top_range;

    if (y < XINT (bar->start))
      emacs_event->part = scroll_bar_above_handle;
    else if (y < XINT (bar->end) + VERTICAL_SCROLL_BAR_MIN_HANDLE)
      emacs_event->part = scroll_bar_handle;
    else
      emacs_event->part = scroll_bar_below_handle;

    /* Just because the user has clicked on the handle doesn't mean
       they want to drag it.  Lisp code needs to be able to decide
       whether or not we're dragging.  */
#if 0
    /* If the user has just clicked on the handle, record where they're
       holding it.  */
    if (event->type == ButtonPress
        && emacs_event->part == scroll_bar_handle)
      XSETINT (bar->dragging, y - XINT (bar->start));
#endif

    /* If the user has released the handle, set it to its final position.  */
    if (event->type == ButtonRelease
        && ! NILP (bar->dragging))
      {
        int new_start = y - XINT (bar->dragging);
        int new_end = new_start + (XINT (bar->end) - XINT (bar->start));

        x_scroll_bar_set_handle (bar, new_start, new_end, 0);
        bar->dragging = Qnil;
      }

    /* Same deal here as the other #if 0.  */
#if 0
    /* Clicks on the handle are always reported as occurring at the top of
       the handle.  */
    if (emacs_event->part == scroll_bar_handle)
      emacs_event->x = bar->start;
    else
      XSETINT (emacs_event->x, y);
#else
    XSETINT (emacs_event->x, y);
#endif

    XSETINT (emacs_event->y, top_range);
  }
}

/* Handle some mouse motion while someone is dragging the scroll bar.

   This may be called from a signal handler, so we have to ignore GC
   mark bits.  */

static void
x_scroll_bar_note_movement (bar, event)
     struct scroll_bar *bar;
     XEvent *event;
{
  FRAME_PTR f = XFRAME (XWINDOW (bar->window)->frame);

  last_mouse_movement_time = event->xmotion.time;

  f->mouse_moved = 1;
  XSETVECTOR (last_mouse_scroll_bar, bar);

  /* If we're dragging the bar, display it.  */
  if (! GC_NILP (bar->dragging))
    {
      /* Where should the handle be now?  */
      int new_start = event->xmotion.y - XINT (bar->dragging);

      if (new_start != XINT (bar->start))
        {
          int new_end = new_start + (XINT (bar->end) - XINT (bar->start));

          x_scroll_bar_set_handle (bar, new_start, new_end, 0);
        }
    }
}

/* Return information to the user about the current position of the mouse
   on the scroll bar.  */

static void
x_scroll_bar_report_motion (fp, bar_window, part, x, y, time)
     FRAME_PTR *fp;
     Lisp_Object *bar_window;
     enum scroll_bar_part *part;
     Lisp_Object *x, *y;
     unsigned long *time;
{
  struct scroll_bar *bar = XSCROLL_BAR (last_mouse_scroll_bar);
  Window w = SCROLL_BAR_X_WINDOW (bar);
  FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
  int win_x, win_y;
  Window dummy_window;
  int dummy_coord;
  unsigned int dummy_mask;

  BLOCK_INPUT;

  /* Get the mouse's position relative to the scroll bar window, and
     report that.  */
  if (! XQueryPointer (FRAME_X_DISPLAY (f), w,

                       /* Root, child, root x and root y.  */
                       &dummy_window, &dummy_window,
                       &dummy_coord, &dummy_coord,

                       /* Position relative to scroll bar.  */
                       &win_x, &win_y,

                       /* Mouse buttons and modifier keys.  */
                       &dummy_mask))
    ;
  else
    {
#if 0
      int inside_height
        = VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (f, XINT (bar->height));
#endif
      int top_range
        = VERTICAL_SCROLL_BAR_TOP_RANGE     (f, XINT (bar->height));

      win_y -= VERTICAL_SCROLL_BAR_TOP_BORDER;

      if (! NILP (bar->dragging))
        win_y -= XINT (bar->dragging);

      if (win_y < 0)
        win_y = 0;
      if (win_y > top_range)
        win_y = top_range;

      *fp = f;
      *bar_window = bar->window;

      if (! NILP (bar->dragging))
        *part = scroll_bar_handle;
      else if (win_y < XINT (bar->start))
        *part = scroll_bar_above_handle;
      else if (win_y < XINT (bar->end) + VERTICAL_SCROLL_BAR_MIN_HANDLE)
        *part = scroll_bar_handle;
      else
        *part = scroll_bar_below_handle;

      XSETINT (*x, win_y);
      XSETINT (*y, top_range);

      f->mouse_moved = 0;
      last_mouse_scroll_bar = Qnil;
    }

  *time = last_mouse_movement_time;

  UNBLOCK_INPUT;
}


/* The screen has been cleared so we may have changed foreground or
   background colors, and the scroll bars may need to be redrawn.
   Clear out the scroll bars, and ask for expose events, so we can
   redraw them.  */

void
x_scroll_bar_clear (f)
     FRAME_PTR f;
{
#ifndef USE_TOOLKIT_SCROLL_BARS
  Lisp_Object bar;

  /* We can have scroll bars even if this is 0,
     if we just turned off scroll bar mode.
     But in that case we should not clear them.  */
  if (FRAME_HAS_VERTICAL_SCROLL_BARS (f))
    for (bar = FRAME_SCROLL_BARS (f); VECTORP (bar);
         bar = XSCROLL_BAR (bar)->next)
      XClearArea (FRAME_X_DISPLAY (f), SCROLL_BAR_X_WINDOW (XSCROLL_BAR (bar)),
                  0, 0, 0, 0, True);
#endif /* not USE_TOOLKIT_SCROLL_BARS */
}

/* This processes Expose events from the menu-bar specific X event
   loop in xmenu.c.  This allows to redisplay the frame if necessary
   when handling menu-bar or pop-up items.  */

int
process_expose_from_menu (event)
     XEvent event;
{
  FRAME_PTR f;
  struct x_display_info *dpyinfo;
  int frame_exposed_p = 0;

  BLOCK_INPUT;

  dpyinfo = x_display_info_for_display (event.xexpose.display);
  f = x_window_to_frame (dpyinfo, event.xexpose.window);
  if (f)
    {
      if (f->async_visible == 0)
        {
          f->async_visible = 1;
          f->async_iconified = 0;
          f->output_data.x->has_been_visible = 1;
          SET_FRAME_GARBAGED (f);
        }
      else
        {
          expose_frame (x_window_to_frame (dpyinfo, event.xexpose.window),
                        event.xexpose.x, event.xexpose.y,
                        event.xexpose.width, event.xexpose.height);
          frame_exposed_p = 1;
        }
    }
  else
    {
      struct scroll_bar *bar
        = x_window_to_scroll_bar (event.xexpose.window);

      if (bar)
        x_scroll_bar_expose (bar, &event);
    }

  UNBLOCK_INPUT;
  return frame_exposed_p;
}
\f
/* Define a queue to save up SelectionRequest events for later handling.  */

struct selection_event_queue
  {
    XEvent event;
    struct selection_event_queue *next;
  };

static struct selection_event_queue *queue;

/* Nonzero means queue up certain events--don't process them yet.  */

static int x_queue_selection_requests;

/* Queue up an X event *EVENT, to be processed later.  */

static void
x_queue_event (f, event)
     FRAME_PTR f;
     XEvent *event;
{
  struct selection_event_queue *queue_tmp
    = (struct selection_event_queue *) xmalloc (sizeof (struct selection_event_queue));

  if (queue_tmp != NULL)
    {
      queue_tmp->event = *event;
      queue_tmp->next = queue;
      queue = queue_tmp;
    }
}

/* Take all the queued events and put them back
   so that they get processed afresh.  */

static void
x_unqueue_events (display)
     Display *display;
{
  while (queue != NULL)
    {
      struct selection_event_queue *queue_tmp = queue;
      XPutBackEvent (display, &queue_tmp->event);
      queue = queue_tmp->next;
      xfree ((char *)queue_tmp);
    }
}

/* Start queuing SelectionRequest events.  */

void
x_start_queuing_selection_requests (display)
     Display *display;
{
  x_queue_selection_requests++;
}

/* Stop queuing SelectionRequest events.  */

void
x_stop_queuing_selection_requests (display)
     Display *display;
{
  x_queue_selection_requests--;
  x_unqueue_events (display);
}
\f
/* The main X event-reading loop - XTread_socket.  */

/* Time stamp of enter window event.  This is only used by XTread_socket,
   but we have to put it out here, since static variables within functions
   sometimes don't work.  */

static Time enter_timestamp;

/* This holds the state XLookupString needs to implement dead keys
   and other tricks known as "compose processing".  _X Window System_
   says that a portable program can't use this, but Stephen Gildea assures
   me that letting the compiler initialize it to zeros will work okay.

   This must be defined outside of XTread_socket, for the same reasons
   given for enter_time stamp, above.  */

static XComposeStatus compose_status;

/* Record the last 100 characters stored
   to help debug the loss-of-chars-during-GC problem.  */

static int temp_index;
static short temp_buffer[100];

/* Set this to nonzero to fake an "X I/O error"
   on a particular display.  */

struct x_display_info *XTread_socket_fake_io_error;

/* When we find no input here, we occasionally do a no-op command
   to verify that the X server is still running and we can still talk with it.
   We try all the open displays, one by one.
   This variable is used for cycling thru the displays.  */

static struct x_display_info *next_noop_dpyinfo;

#define SET_SAVED_MENU_EVENT(size)                                      \
     do                                                                 \
       {                                                                \
         if (f->output_data.x->saved_menu_event == 0)                   \
           f->output_data.x->saved_menu_event                           \
             = (XEvent *) xmalloc (sizeof (XEvent));                    \
         bcopy (&event, f->output_data.x->saved_menu_event, size);      \
         if (numchars >= 1)                                             \
           {                                                            \
             bufp->kind = menu_bar_activate_event;                      \
             XSETFRAME (bufp->frame_or_window, f);                      \
             bufp++;                                                    \
             count++;                                                   \
             numchars--;                                                \
           }                                                            \
       }                                                                \
     while (0)

#define SET_SAVED_BUTTON_EVENT SET_SAVED_MENU_EVENT (sizeof (XButtonEvent))
#define SET_SAVED_KEY_EVENT    SET_SAVED_MENU_EVENT (sizeof (XKeyEvent))

/* Read events coming from the X server.
   This routine is called by the SIGIO handler.
   We return as soon as there are no more events to be read.

   Events representing keys are stored in buffer BUFP,
   which can hold up to NUMCHARS characters.
   We return the number of characters stored into the buffer,
   thus pretending to be `read'.

   EXPECTED is nonzero if the caller knows input is available.  */

int
XTread_socket (sd, bufp, numchars, expected)
     register int sd;
     /* register */ struct input_event *bufp;
     /* register */ int numchars;
     int expected;
{
  int count = 0;
  int nbytes = 0;
  XEvent event;
  struct frame *f;
  int event_found = 0;
  struct x_display_info *dpyinfo;
#ifdef HAVE_X_I18N
  Status status_return;
#endif

  if (interrupt_input_blocked)
    {
      interrupt_input_pending = 1;
      return -1;
    }

  interrupt_input_pending = 0;
  BLOCK_INPUT;

  /* So people can tell when we have read the available input.  */
  input_signal_count++;

  if (numchars <= 0)
    abort ();                   /* Don't think this happens.  */

  /* Find the display we are supposed to read input for.
     It's the one communicating on descriptor SD.  */
  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    {
#if 0 /* This ought to be unnecessary; let's verify it.  */
#ifdef FIOSNBIO
      /* If available, Xlib uses FIOSNBIO to make the socket
         non-blocking, and then looks for EWOULDBLOCK.  If O_NDELAY is set,
         FIOSNBIO is ignored, and instead of signaling EWOULDBLOCK,
         a read returns 0, which Xlib interprets as equivalent to EPIPE.  */
      fcntl (dpyinfo->connection, F_SETFL, 0);
#endif /* ! defined (FIOSNBIO) */
#endif

#if 0 /* This code can't be made to work, with multiple displays,
         and appears not to be used on any system any more.
         Also keyboard.c doesn't turn O_NDELAY on and off
         for X connections.  */
#ifndef SIGIO
#ifndef HAVE_SELECT
      if (! (fcntl (dpyinfo->connection, F_GETFL, 0) & O_NDELAY))
        {
          extern int read_alarm_should_throw;
          read_alarm_should_throw = 1;
          XPeekEvent (dpyinfo->display, &event);
          read_alarm_should_throw = 0;
        }
#endif /* HAVE_SELECT */
#endif /* SIGIO */
#endif

      /* For debugging, this gives a way to fake an I/O error.  */
      if (dpyinfo == XTread_socket_fake_io_error)
        {
          XTread_socket_fake_io_error = 0;
          x_io_error_quitter (dpyinfo->display);
        }

      while (XPending (dpyinfo->display))
        {
          XNextEvent (dpyinfo->display, &event);

          if (display_busy_cursor_p)
            {
              /* Setting inhibit_busy_cursor to 2 inhibits busy-cursor
                 display until the next X event is read and we come
                 here again.  Setting it to 1 inhibits busy-cursor
                 display for direct commands.  */
              if (event.type == MotionNotify
                  || event.type == EnterNotify
                  || (dpyinfo->grabbed
                      && event.type != ButtonRelease))
                inhibit_busy_cursor = 2;
              else
                inhibit_busy_cursor = 1;
            }

#ifdef HAVE_X_I18N
          {
            struct frame *f1 = x_any_window_to_frame (dpyinfo,
                                                      event.xclient.window);
            /* The necessity of the following line took me
               a full work-day to decipher from the docs!!  */
            if (f1 != 0 && FRAME_XIC (f1) && XFilterEvent (&event, None))
              break;
          }
#endif
          event_found = 1;

          switch (event.type)
            {
            case ClientMessage:
              {
                if (event.xclient.message_type
                    == dpyinfo->Xatom_wm_protocols
                    && event.xclient.format == 32)
                  {
                    if (event.xclient.data.l[0]
                        == dpyinfo->Xatom_wm_take_focus)
                      {
                        /* Use x_any_window_to_frame because this
                           could be the shell widget window
                           if the frame has no title bar.  */
                        f = x_any_window_to_frame (dpyinfo, event.xclient.window);
#ifdef HAVE_X_I18N
                        /* Not quite sure this is needed -pd */
                        if (f && FRAME_XIC (f))
                          XSetICFocus (FRAME_XIC (f));
#endif
                        /* Since we set WM_TAKE_FOCUS, we must call
                           XSetInputFocus explicitly.  But not if f is null,
                           since that might be an event for a deleted frame.  */
                        if (f)
                          {
                            Display *d = event.xclient.display;
                            /* Catch and ignore errors, in case window has been
                               iconified by a window manager such as GWM.  */
                            int count = x_catch_errors (d);
                            XSetInputFocus (d, event.xclient.window,
                                            RevertToPointerRoot,
                                            event.xclient.data.l[1]);
                            /* This is needed to detect the error
                               if there is an error.  */
                            XSync (d, False);
                            x_uncatch_errors (d, count);
                          }  
                        /* Not certain about handling scroll bars here */
                      }
                    else if (event.xclient.data.l[0]
                             == dpyinfo->Xatom_wm_save_yourself)
                      {
                        /* Save state modify the WM_COMMAND property to
                           something which can reinstate us.  This notifies
                           the session manager, who's looking for such a
                           PropertyNotify.  Can restart processing when
                           a keyboard or mouse event arrives.  */
                        if (numchars > 0)
                          {
                            f = x_top_window_to_frame (dpyinfo,
                                                       event.xclient.window);

                            /* This is just so we only give real data once
                               for a single Emacs process.  */
                            if (f == selected_frame)
                              XSetCommand (FRAME_X_DISPLAY (f),
                                           event.xclient.window,
                                           initial_argv, initial_argc);
                            else if (f)
                              XSetCommand (FRAME_X_DISPLAY (f),
                                           event.xclient.window,
                                           0, 0);
                          }
                      }
                    else if (event.xclient.data.l[0]
                             == dpyinfo->Xatom_wm_delete_window)
                      {
                        struct frame *f
                          = x_any_window_to_frame (dpyinfo,
                                                   event.xclient.window);

                        if (f)
                          {
                            if (numchars == 0)
                              abort ();

                            bufp->kind = delete_window_event;
                            XSETFRAME (bufp->frame_or_window, f);
                            bufp++;

                            count += 1;
                            numchars -= 1;
                          }
                      }
                  }
                else if (event.xclient.message_type
                         == dpyinfo->Xatom_wm_configure_denied)
                  {
                  }
                else if (event.xclient.message_type
                         == dpyinfo->Xatom_wm_window_moved)
                  {
                    int new_x, new_y;
                    struct frame *f
                      = x_window_to_frame (dpyinfo, event.xclient.window);

                    new_x = event.xclient.data.s[0];
                    new_y = event.xclient.data.s[1];

                    if (f)
                      {
                        f->output_data.x->left_pos = new_x;
                        f->output_data.x->top_pos = new_y;
                      }
                  }
#ifdef HACK_EDITRES
                else if (event.xclient.message_type
                         == dpyinfo->Xatom_editres)
                  {
                    struct frame *f
                      = x_any_window_to_frame (dpyinfo, event.xclient.window);
                    _XEditResCheckMessages (f->output_data.x->widget, NULL,
                                            &event, NULL);
                  }
#endif /* HACK_EDITRES */
                else if ((event.xclient.message_type
                          == dpyinfo->Xatom_DONE)
                         || (event.xclient.message_type
                             == dpyinfo->Xatom_PAGE))
                  {
                    /* Ghostview job completed.  Kill it.  We could
                       reply with "Next" if we received "Page", but we
                       currently never do because we are interested in
                       images, only, which should have 1 page.  */
                    Window gs_window = (Window) event.xclient.data.l[0];
                    Pixmap pixmap = (Pixmap) event.xclient.data.l[1];
                    struct frame *f
                      = x_window_to_frame (dpyinfo, event.xclient.window);
                    x_kill_gs_process (pixmap, f);
                    expose_frame (f, 0, 0, 0, 0);
                  }
#ifdef USE_TOOLKIT_SCROLL_BARS
                /* Scroll bar callbacks send a ClientMessage from which
                   we construct an input_event.  */
                else if (event.xclient.message_type
                         == dpyinfo->Xatom_Scrollbar)
                  {
                    x_scroll_bar_to_input_event (&event, bufp);
                    ++bufp, ++count, --numchars;
                    goto out;
                  }
#endif /* USE_TOOLKIT_SCROLL_BARS */
                else
                  goto OTHER;
              }
              break;

            case SelectionNotify:
#ifdef USE_X_TOOLKIT
              if (! x_window_to_frame (dpyinfo, event.xselection.requestor))
                goto OTHER;
#endif /* not USE_X_TOOLKIT */
              x_handle_selection_notify (&event.xselection);
              break;

            case SelectionClear:        /* Someone has grabbed ownership.  */
#ifdef USE_X_TOOLKIT
              if (! x_window_to_frame (dpyinfo, event.xselectionclear.window))
                goto OTHER;
#endif /* USE_X_TOOLKIT */
              {
                XSelectionClearEvent *eventp = (XSelectionClearEvent *) &event;

                if (numchars == 0)
                  abort ();

                bufp->kind = selection_clear_event;
                SELECTION_EVENT_DISPLAY (bufp) = eventp->display;
                SELECTION_EVENT_SELECTION (bufp) = eventp->selection;
                SELECTION_EVENT_TIME (bufp) = eventp->time;
                bufp->frame_or_window = Qnil;
                bufp++;

                count += 1;
                numchars -= 1;
              }
              break;

            case SelectionRequest:      /* Someone wants our selection.  */
#ifdef USE_X_TOOLKIT
              if (!x_window_to_frame (dpyinfo, event.xselectionrequest.owner))
                goto OTHER;
#endif /* USE_X_TOOLKIT */
              if (x_queue_selection_requests)
                x_queue_event (x_window_to_frame (dpyinfo, event.xselectionrequest.owner),
                               &event);
              else
                {
                  XSelectionRequestEvent *eventp = (XSelectionRequestEvent *) &event;

                  if (numchars == 0)
                    abort ();

                  bufp->kind = selection_request_event;
                  SELECTION_EVENT_DISPLAY (bufp) = eventp->display;
                  SELECTION_EVENT_REQUESTOR (bufp) = eventp->requestor;
                  SELECTION_EVENT_SELECTION (bufp) = eventp->selection;
                  SELECTION_EVENT_TARGET (bufp) = eventp->target;
                  SELECTION_EVENT_PROPERTY (bufp) = eventp->property;
                  SELECTION_EVENT_TIME (bufp) = eventp->time;
                  bufp->frame_or_window = Qnil;
                  bufp++;

                  count += 1;
                  numchars -= 1;
                }
              break;

            case PropertyNotify:
#ifdef USE_X_TOOLKIT
              if (!x_any_window_to_frame (dpyinfo, event.xproperty.window))
                goto OTHER;
#endif /* not USE_X_TOOLKIT */
              x_handle_property_notify (&event.xproperty);
              break;

            case ReparentNotify:
              f = x_top_window_to_frame (dpyinfo, event.xreparent.window);
              if (f)
                {
                  int x, y;
                  f->output_data.x->parent_desc = event.xreparent.parent;
                  x_real_positions (f, &x, &y);
                  f->output_data.x->left_pos = x;
                  f->output_data.x->top_pos = y;
                }
              break;

            case Expose:
              f = x_window_to_frame (dpyinfo, event.xexpose.window);
              if (f)
                {
                  if (f->async_visible == 0)
                    {
                      f->async_visible = 1;
                      f->async_iconified = 0;
                      f->output_data.x->has_been_visible = 1;
                      SET_FRAME_GARBAGED (f);
                    }
                  else
                    expose_frame (x_window_to_frame (dpyinfo,
                                                     event.xexpose.window),
                                  event.xexpose.x, event.xexpose.y,
                                  event.xexpose.width, event.xexpose.height);
                }
              else
                {
#ifdef USE_TOOLKIT_SCROLL_BARS
                  /* Dispatch event to the widget.  */
                  goto OTHER;
#else /* not USE_TOOLKIT_SCROLL_BARS */
                  struct scroll_bar *bar
                    = x_window_to_scroll_bar (event.xexpose.window);

                  if (bar)
                    x_scroll_bar_expose (bar, &event);
#ifdef USE_X_TOOLKIT
                  else
                    goto OTHER;
#endif /* USE_X_TOOLKIT */
#endif /* not USE_TOOLKIT_SCROLL_BARS */
                }
              break;

            case GraphicsExpose:        /* This occurs when an XCopyArea's
                                      source area was obscured or not
                                      available.*/
              f = x_window_to_frame (dpyinfo, event.xgraphicsexpose.drawable);
              if (f)
                {
                  expose_frame (f,
                                event.xgraphicsexpose.x, event.xgraphicsexpose.y,
                                event.xgraphicsexpose.width,
                                event.xgraphicsexpose.height);
                }
#ifdef USE_X_TOOLKIT
              else
                goto OTHER;
#endif /* USE_X_TOOLKIT */
              break;

            case NoExpose:              /* This occurs when an XCopyArea's
                                           source area was completely
                                           available */
              break;

            case UnmapNotify:
              /* Redo the mouse-highlight after the tooltip has gone.  */
              if (event.xmap.window == tip_window)
                {
                  tip_window = 0;
                  redo_mouse_highlight ();
                }
              
              f = x_top_window_to_frame (dpyinfo, event.xunmap.window);
              if (f)            /* F may no longer exist if
                                       the frame was deleted.  */
                {
                  /* While a frame is unmapped, display generation is
                     disabled; you don't want to spend time updating a
                     display that won't ever be seen.  */
                  f->async_visible = 0;
                  /* We can't distinguish, from the event, whether the window
                     has become iconified or invisible.  So assume, if it
                     was previously visible, than now it is iconified.
                     But x_make_frame_invisible clears both
                     the visible flag and the iconified flag;
                     and that way, we know the window is not iconified now.  */
                  if (FRAME_VISIBLE_P (f) || FRAME_ICONIFIED_P (f))
                    {
                      f->async_iconified = 1;

                      bufp->kind = iconify_event;
                      XSETFRAME (bufp->frame_or_window, f);
                      bufp++;
                      count++;
                      numchars--;
                    }
                }
              goto OTHER;

            case MapNotify:
              if (event.xmap.window == tip_window)
                /* The tooltip has been drawn already.  Avoid
                   the SET_FRAME_GARBAGED below.  */
                goto OTHER;
              
              /* We use x_top_window_to_frame because map events can
                 come for sub-windows and they don't mean that the
                 frame is visible.  */
              f = x_top_window_to_frame (dpyinfo, event.xmap.window);
              if (f)
                {
                  f->async_visible = 1;
                  f->async_iconified = 0;
                  f->output_data.x->has_been_visible = 1;

                  /* wait_reading_process_input will notice this and update
                     the frame's display structures.  */
                  SET_FRAME_GARBAGED (f);

                  if (f->iconified)
                    {
                      bufp->kind = deiconify_event;
                      XSETFRAME (bufp->frame_or_window, f);
                      bufp++;
                      count++;
                      numchars--;
                    }
                  else if (! NILP (Vframe_list)
                           && ! NILP (XCONS (Vframe_list)->cdr))
                    /* Force a redisplay sooner or later
                       to update the frame titles
                       in case this is the second frame.  */
                    record_asynch_buffer_change ();
                }
              goto OTHER;

            case KeyPress:
              f = x_any_window_to_frame (dpyinfo, event.xkey.window);

#ifdef USE_MOTIF
              /* I couldn't find a way to prevent LessTif scroll bars
                 from consuming key events.  */
              if (f == 0)
                {
                  Widget widget = XtWindowToWidget (dpyinfo->display,
                                                    event.xkey.window);
                  if (widget && XmIsScrollBar (widget))
                    {
                      widget = XtParent (widget);
                      f = x_any_window_to_frame (dpyinfo, XtWindow (widget));
                    }
                }
#endif /* USE_MOTIF */

              if (f != 0)
                {
                  KeySym keysym, orig_keysym;
                  /* al%imercury@uunet.uu.net says that making this 81 instead of
                     80 fixed a bug whereby meta chars made his Emacs hang.  */
                  unsigned char copy_buffer[81];
                  int modifiers;

                  event.xkey.state
                    |= x_emacs_to_x_modifiers (FRAME_X_DISPLAY_INFO (f),
                                               extra_keyboard_modifiers);
                  modifiers = event.xkey.state;

                  /* This will have to go some day...  */

                  /* make_lispy_event turns chars into control chars.
                     Don't do it here because XLookupString is too eager.  */
                  event.xkey.state &= ~ControlMask;
                  event.xkey.state &= ~(dpyinfo->meta_mod_mask
                                        | dpyinfo->super_mod_mask
                                        | dpyinfo->hyper_mod_mask
                                        | dpyinfo->alt_mod_mask);

                  /* In case Meta is ComposeCharacter,
                     clear its status.  According to Markus Ehrnsperger
                     Markus.Ehrnsperger@lehrstuhl-bross.physik.uni-muenchen.de
                     this enables ComposeCharacter to work whether or
                     not it is combined with Meta.  */
                  if (modifiers & dpyinfo->meta_mod_mask)
                    bzero (&compose_status, sizeof (compose_status));

#ifdef HAVE_X_I18N
                  if (FRAME_XIC (f))
                    {
                      /* The necessity of the following line took me
                         a full work-day to decipher from the docs!!  */
                      if (XFilterEvent (&event, None))
                        break;
                      nbytes = XmbLookupString (FRAME_XIC (f),
                                                &event.xkey, copy_buffer,
                                                80, &keysym,
                                                &status_return);
                      if (status_return == XLookupNone)
                        break;
                      else if (status_return == XLookupChars)
                        keysym = NoSymbol;
                      else if (status_return != XLookupKeySym
                               && status_return != XLookupBoth)
                        abort ();
                    }
                  else
                    nbytes = XLookupString (&event.xkey, copy_buffer,
                                            80, &keysym, &compose_status);
#else
                  nbytes = XLookupString (&event.xkey, copy_buffer,
                                          80, &keysym, &compose_status);
#endif

                  orig_keysym = keysym;

                  if (numchars > 1)
                    {
                      if (((keysym >= XK_BackSpace && keysym <= XK_Escape)
                           || keysym == XK_Delete
#ifdef XK_ISO_Left_Tab
                           || (keysym >= XK_ISO_Left_Tab && keysym <= XK_ISO_Enter)
#endif
                           || (keysym >= XK_Kanji && keysym <= XK_Eisu_toggle)
                           || IsCursorKey (keysym) /* 0xff50 <= x < 0xff60 */
                           || IsMiscFunctionKey (keysym) /* 0xff60 <= x < VARIES */
#ifdef HPUX
                           /* This recognizes the "extended function keys".
                              It seems there's no cleaner way.
                              Test IsModifierKey to avoid handling mode_switch
                              incorrectly.  */
                           || ((unsigned) (keysym) >= XK_Select
                               && (unsigned)(keysym) < XK_KP_Space)
#endif
#ifdef XK_dead_circumflex
                           || orig_keysym == XK_dead_circumflex
#endif
#ifdef XK_dead_grave
                           || orig_keysym == XK_dead_grave
#endif
#ifdef XK_dead_tilde
                           || orig_keysym == XK_dead_tilde
#endif
#ifdef XK_dead_diaeresis
                           || orig_keysym == XK_dead_diaeresis
#endif
#ifdef XK_dead_macron
                           || orig_keysym == XK_dead_macron
#endif
#ifdef XK_dead_degree
                           || orig_keysym == XK_dead_degree
#endif
#ifdef XK_dead_acute
                           || orig_keysym == XK_dead_acute
#endif
#ifdef XK_dead_cedilla
                           || orig_keysym == XK_dead_cedilla
#endif
#ifdef XK_dead_breve
                           || orig_keysym == XK_dead_breve
#endif
#ifdef XK_dead_ogonek
                           || orig_keysym == XK_dead_ogonek
#endif
#ifdef XK_dead_caron
                           || orig_keysym == XK_dead_caron
#endif
#ifdef XK_dead_doubleacute
                           || orig_keysym == XK_dead_doubleacute
#endif
#ifdef XK_dead_abovedot
                           || orig_keysym == XK_dead_abovedot
#endif
                           || IsKeypadKey (keysym) /* 0xff80 <= x < 0xffbe */
                           || IsFunctionKey (keysym) /* 0xffbe <= x < 0xffe1 */
                           /* Any "vendor-specific" key is ok.  */
                           || (orig_keysym & (1 << 28)))
                          && ! (IsModifierKey (orig_keysym)
#ifndef HAVE_X11R5
#ifdef XK_Mode_switch
                                || ((unsigned)(orig_keysym) == XK_Mode_switch)
#endif
#ifdef XK_Num_Lock
                                || ((unsigned)(orig_keysym) == XK_Num_Lock)
#endif
#endif /* not HAVE_X11R5 */
                                ))
                        {
                          if (temp_index == sizeof temp_buffer / sizeof (short))
                            temp_index = 0;
                          temp_buffer[temp_index++] = keysym;
                          bufp->kind = non_ascii_keystroke;
                          bufp->code = keysym;
                          XSETFRAME (bufp->frame_or_window, f);
                          bufp->modifiers
                            = x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO (f),
                                                      modifiers);
                          bufp->timestamp = event.xkey.time;
                          bufp++;
                          count++;
                          numchars--;
                          
                          if (display_busy_cursor_p)
                            if (keysym != XK_Return || minibuf_level == 0)
                              inhibit_busy_cursor = 2;
                        }
                      else if (numchars > nbytes)
                        {
                          register int i;

                          for (i = 0; i < nbytes; i++)
                            {
                              if (temp_index == sizeof temp_buffer / sizeof (short))
                                temp_index = 0;
                              temp_buffer[temp_index++] = copy_buffer[i];
                              bufp->kind = ascii_keystroke;
                              bufp->code = copy_buffer[i];
                              XSETFRAME (bufp->frame_or_window, f);
                              bufp->modifiers
                                = x_x_to_emacs_modifiers (FRAME_X_DISPLAY_INFO (f),
                                                          modifiers);
                              bufp->timestamp = event.xkey.time;
                              bufp++;
                            }

                          count += nbytes;
                          numchars -= nbytes;

                          if (keysym == NoSymbol)
                            break;
                        }
                      else
                        abort ();
                    }
                  else
                    abort ();
                }
              goto OTHER;

              /* Here's a possible interpretation of the whole
                 FocusIn-EnterNotify FocusOut-LeaveNotify mess.  If
                 you get a FocusIn event, you have to get a FocusOut
                 event before you relinquish the focus.  If you
                 haven't received a FocusIn event, then a mere
                 LeaveNotify is enough to free you.  */

            case EnterNotify:
              {
                int from_menu_bar_p = 0;
                
                f = x_any_window_to_frame (dpyinfo, event.xcrossing.window);

#ifdef LESSTIF_VERSION
                /* When clicking outside of a menu bar popup to close
                   it, we get a FocusIn/ EnterNotify sequence of
                   events.  The flag event.xcrossing.focus is not set
                   in the EnterNotify event of that sequence because
                   the focus is in the menu bar,
                   event.xcrossing.window is the frame's X window.
                   Unconditionally setting the focus frame to null in
                   this case is not the right thing, because no event
                   follows that could set the focus frame to the right
                   value.

                   This could be a LessTif bug, but I wasn't able to
                   reproduce the behavior in a simple test program.

                   (gerd, LessTif 0.88.1).  */
                
                if (!event.xcrossing.focus
                    && f
                    && f->output_data.x->menubar_widget)
                  {
                    Window focus;
                    int revert;
                    
                    XGetInputFocus (FRAME_X_DISPLAY (f), &focus, &revert);
                    if (focus == XtWindow (f->output_data.x->menubar_widget))
                      from_menu_bar_p = 1;
                  }
#endif /* LESSTIF_VERSION */

                if (event.xcrossing.focus || from_menu_bar_p)
                  {
                    /* Avoid nasty pop/raise loops.  */
                    if (f && (!(f->auto_raise)
                              || !(f->auto_lower)
                              || (event.xcrossing.time - enter_timestamp) > 500))
                      {
                        x_new_focus_frame (dpyinfo, f);
                        enter_timestamp = event.xcrossing.time;
                      }
                  }
                else if (f == dpyinfo->x_focus_frame)
                  x_new_focus_frame (dpyinfo, 0);
              
                /* EnterNotify counts as mouse movement,
                   so update things that depend on mouse position.  */
                if (f && !f->output_data.x->busy_p)
                  note_mouse_movement (f, &event.xmotion);
                goto OTHER;
              }

            case FocusIn:
              f = x_any_window_to_frame (dpyinfo, event.xfocus.window);
              if (event.xfocus.detail != NotifyPointer)
                dpyinfo->x_focus_event_frame = f;
              if (f)
                x_new_focus_frame (dpyinfo, f);

#ifdef HAVE_X_I18N
              if (f && FRAME_XIC (f))
                XSetICFocus (FRAME_XIC (f));
#endif

              goto OTHER;

            case LeaveNotify:
              f = x_top_window_to_frame (dpyinfo, event.xcrossing.window);
              if (f)
                {
                  Lisp_Object frame;
                  int from_menu_bar_p = 0;
                  
                  if (f == dpyinfo->mouse_face_mouse_frame)
                    {
                      /* If we move outside the frame, then we're
                         certainly no longer on any text in the frame.  */
                      clear_mouse_face (dpyinfo);
                      dpyinfo->mouse_face_mouse_frame = 0;
                    }

                  /* Generate a nil HELP_EVENT to cancel a help-echo.
                     Do it only if there's something to cancel.
                     Otherwise, the startup message is cleared when
                     the mouse leaves the frame.  */
                  if (any_help_event_p)
                    {
                      XSETFRAME (frame, f);
                      bufp->kind = HELP_EVENT;
                      bufp->frame_or_window = Fcons (frame, Qnil);
                      ++bufp, ++count, --numchars;
                    }

#ifdef LESSTIF_VERSION
                  /* Please see the comment at the start of the
                     EnterNotify case.  */
                  if (!event.xcrossing.focus
                      && f->output_data.x->menubar_widget)
                    {
                      Window focus;
                      int revert;
                      XGetInputFocus (FRAME_X_DISPLAY (f), &focus, &revert);
                      if (focus == XtWindow (f->output_data.x->menubar_widget))
                        from_menu_bar_p = 1;
                    }
#endif /* LESSTIF_VERSION */
                
                  if (event.xcrossing.focus || from_menu_bar_p)
                    x_mouse_leave (dpyinfo);
                  else
                    {
                      if (f == dpyinfo->x_focus_event_frame)
                        dpyinfo->x_focus_event_frame = 0;
                      if (f == dpyinfo->x_focus_frame)
                        x_new_focus_frame (dpyinfo, 0);
                    }
                }
              goto OTHER;

            case FocusOut:
              f = x_any_window_to_frame (dpyinfo, event.xfocus.window);
              if (event.xfocus.detail != NotifyPointer
                  && f == dpyinfo->x_focus_event_frame)
                dpyinfo->x_focus_event_frame = 0;
              if (f && f == dpyinfo->x_focus_frame)
                x_new_focus_frame (dpyinfo, 0);

#ifdef HAVE_X_I18N
              if (f && FRAME_XIC (f))
                XUnsetICFocus (FRAME_XIC (f));
#endif

              goto OTHER;

            case MotionNotify:
              {
                previous_help_echo = help_echo;
                help_echo = Qnil;
                
                if (dpyinfo->grabbed && last_mouse_frame
                    && FRAME_LIVE_P (last_mouse_frame))
                  f = last_mouse_frame;
                else
                  f = x_window_to_frame (dpyinfo, event.xmotion.window);

                if (f)
                  note_mouse_movement (f, &event.xmotion);
                else
                  {
#ifndef USE_X_TOOLKIT
                    struct scroll_bar *bar
                      = x_window_to_scroll_bar (event.xmotion.window);

                    if (bar)
                      x_scroll_bar_note_movement (bar, &event);
#endif /* USE_X_TOOLKIT */

                    /* If we move outside the frame, then we're
                       certainly no longer on any text in the frame.  */
                    clear_mouse_face (dpyinfo);
                  }

                /* If the contents of the global variable help_echo
                   has changed, generate a HELP_EVENT.  */
                if (STRINGP (help_echo)
                    || STRINGP (previous_help_echo))
                  {
                    Lisp_Object frame;

                    if (f)
                      XSETFRAME (frame, f);
                    else
                      frame = Qnil;

                    any_help_event_p = 1;
                    bufp->kind = HELP_EVENT;
                    bufp->frame_or_window = Fcons (frame, help_echo);
                    ++bufp, ++count, --numchars;
                  }
                
                goto OTHER;
              }

            case ConfigureNotify:
              f = x_top_window_to_frame (dpyinfo, event.xconfigure.window);
              if (f)
                {
                  int rows = PIXEL_TO_CHAR_HEIGHT (f, event.xconfigure.height);
                  int columns = PIXEL_TO_CHAR_WIDTH (f, event.xconfigure.width);

#ifndef USE_X_TOOLKIT
                  /* In the toolkit version, change_frame_size
                     is called by the code that handles resizing
                     of the EmacsFrame widget.  */

                  /* Even if the number of character rows and columns has
                     not changed, the font size may have changed, so we need
                     to check the pixel dimensions as well.  */
                  if (columns != f->width
                      || rows != f->height
                      || event.xconfigure.width != f->output_data.x->pixel_width
                      || event.xconfigure.height != f->output_data.x->pixel_height)
                    {
                      change_frame_size (f, rows, columns, 0, 1);
                      SET_FRAME_GARBAGED (f);
                      cancel_mouse_face (f);
                    }
#endif

                  f->output_data.x->pixel_width = event.xconfigure.width;
                  f->output_data.x->pixel_height = event.xconfigure.height;

                  /* What we have now is the position of Emacs's own window.
                     Convert that to the position of the window manager window.  */
                  x_real_positions (f, &f->output_data.x->left_pos,
                                    &f->output_data.x->top_pos);

                  if (f->output_data.x->parent_desc != FRAME_X_DISPLAY_INFO (f)->root_window)
                    {
                      /* Since the WM decorations come below top_pos now,
                         we must put them below top_pos in the future.  */
                      f->output_data.x->win_gravity = NorthWestGravity;
                      x_wm_set_size_hint (f, (long) 0, 0);
                    }
#ifdef USE_MOTIF
                  /* Some window managers pass (0,0) as the location of
                     the window, and the Motif event handler stores it
                     in the emacs widget, which messes up Motif menus.  */
                  if (event.xconfigure.x == 0 && event.xconfigure.y == 0)
                    {
                      event.xconfigure.x = f->output_data.x->widget->core.x;
                      event.xconfigure.y = f->output_data.x->widget->core.y;
                    }
#endif /* USE_MOTIF */
                }
              goto OTHER;

            case ButtonPress:
            case ButtonRelease:
              {
                /* If we decide we want to generate an event to be seen
                   by the rest of Emacs, we put it here.  */
                struct input_event emacs_event;
                int toolbar_p = 0;
                
                emacs_event.kind = no_event;
                bzero (&compose_status, sizeof (compose_status));

                if (dpyinfo->grabbed
                    && last_mouse_frame
                    && FRAME_LIVE_P (last_mouse_frame))
                  f = last_mouse_frame;
                else
                  f = x_window_to_frame (dpyinfo, event.xbutton.window);

                if (f)
                  {
                    /* Is this in the toolbar?  */
                    if (WINDOWP (f->toolbar_window)
                        && XFASTINT (XWINDOW (f->toolbar_window)->height))
                      {
                        Lisp_Object window;
                        int p, x, y;

                        x = event.xbutton.x;
                        y = event.xbutton.y;

                        /* Set x and y.  */
                        window = window_from_coordinates (f, x, y, &p, 1);
                        if (EQ (window, f->toolbar_window))
                          {
                            x_handle_toolbar_click (f, &event.xbutton);
                            toolbar_p = 1;
                          }
                      }

                    if (!toolbar_p)
                      if (!dpyinfo->x_focus_frame
                          || f == dpyinfo->x_focus_frame)
                        construct_mouse_click (&emacs_event, &event, f);
                  }
                else
                  {
#ifndef USE_TOOLKIT_SCROLL_BARS
                    struct scroll_bar *bar
                      = x_window_to_scroll_bar (event.xbutton.window);

                    if (bar)
                      x_scroll_bar_handle_click (bar, &event, &emacs_event);
#endif /* not USE_TOOLKIT_SCROLL_BARS */
                  }

                if (event.type == ButtonPress)
                  {
                    dpyinfo->grabbed |= (1 << event.xbutton.button);
                    last_mouse_frame = f;
                    /* Ignore any mouse motion that happened
                       before this event; any subsequent mouse-movement
                       Emacs events should reflect only motion after
                       the ButtonPress.  */
                    if (f != 0)
                      f->mouse_moved = 0;
                    
                    if (!toolbar_p)
                      last_toolbar_item = -1;
                    if (display_busy_cursor_p)
                      inhibit_busy_cursor = 2;
                  }
                else
                  {
                    dpyinfo->grabbed &= ~(1 << event.xbutton.button);
                  }

                if (numchars >= 1 && emacs_event.kind != no_event)
                  {
                    bcopy (&emacs_event, bufp, sizeof (struct input_event));
                    bufp++;
                    count++;
                    numchars--;
                  }

#ifdef USE_X_TOOLKIT
                f = x_menubar_window_to_frame (dpyinfo, event.xbutton.window);
                /* For a down-event in the menu bar,
                   don't pass it to Xt right now.
                   Instead, save it away
                   and we will pass it to Xt from kbd_buffer_get_event.
                   That way, we can run some Lisp code first.  */
                if (f && event.type == ButtonPress
                    /* Verify the event is really within the menu bar
                       and not just sent to it due to grabbing.  */
                    && event.xbutton.x >= 0
                    && event.xbutton.x < f->output_data.x->pixel_width
                    && event.xbutton.y >= 0
                    && event.xbutton.y < f->output_data.x->menubar_height
                    && event.xbutton.same_screen)
                  {
                    SET_SAVED_BUTTON_EVENT;
                    XSETFRAME (last_mouse_press_frame, f);
                  }
                else if (event.type == ButtonPress)
                  {
                    last_mouse_press_frame = Qnil;
                    goto OTHER;
                  }

#ifdef USE_MOTIF /* This should do not harm for Lucid,
                    but I am trying to be cautious.  */
                else if (event.type == ButtonRelease)
                  {
                    if (!NILP (last_mouse_press_frame))
                      {
                        f = XFRAME (last_mouse_press_frame);
                        if (f->output_data.x)
                          SET_SAVED_BUTTON_EVENT;
                      }
                    else
                      goto OTHER;
                  }
#endif /* USE_MOTIF */
                else
                  goto OTHER;
#endif /* USE_X_TOOLKIT */
              }
              break;

            case CirculateNotify:
              goto OTHER;
              
            case CirculateRequest:
              goto OTHER;

            case VisibilityNotify:
              goto OTHER;

            case MappingNotify:
              /* Someone has changed the keyboard mapping - update the
                 local cache.  */
              switch (event.xmapping.request)
                {
                case MappingModifier:
                  x_find_modifier_meanings (dpyinfo);
                  /* This is meant to fall through.  */
                case MappingKeyboard:
                  XRefreshKeyboardMapping (&event.xmapping);
                }
              goto OTHER;

            default:
            OTHER:
#ifdef USE_X_TOOLKIT
              BLOCK_INPUT;
              XtDispatchEvent (&event);
              UNBLOCK_INPUT;
#endif /* USE_X_TOOLKIT */
              break;
            }
        }
    }

 out:;

  /* On some systems, an X bug causes Emacs to get no more events
     when the window is destroyed.  Detect that.  (1994.)  */
  if (! event_found)
    {
      /* Emacs and the X Server eats up CPU time if XNoOp is done every time.
         One XNOOP in 100 loops will make Emacs terminate.
         B. Bretthauer, 1994 */
      x_noop_count++;
      if (x_noop_count >= 100)
        {
          x_noop_count=0;

          if (next_noop_dpyinfo == 0)
            next_noop_dpyinfo = x_display_list;

          XNoOp (next_noop_dpyinfo->display);

          /* Each time we get here, cycle through the displays now open.  */
          next_noop_dpyinfo = next_noop_dpyinfo->next;
        }
    }

  /* If the focus was just given to an auto-raising frame,
     raise it now.  */
  /* ??? This ought to be able to handle more than one such frame.  */
  if (pending_autoraise_frame)
    {
      x_raise_frame (pending_autoraise_frame);
      pending_autoraise_frame = 0;
    }

  UNBLOCK_INPUT;
  return count;
}



\f
/***********************************************************************
                             Text Cursor
 ***********************************************************************/

/* Note if the text cursor of window W has been overwritten by a
   drawing operation that outputs N glyphs starting at HPOS in the
   line given by output_cursor.vpos.  N < 0 means all the rest of the
   line after HPOS has been written.  */

static void
note_overwritten_text_cursor (w, hpos, n)
     struct window *w;
     int hpos, n;
{
  if (updated_area == TEXT_AREA
      && output_cursor.vpos == w->phys_cursor.vpos
      && hpos <= w->phys_cursor.hpos
      && (n < 0
          || hpos + n > w->phys_cursor.hpos))
    w->phys_cursor_on_p = 0;
}


/* Set clipping for output in glyph row ROW.  W is the window in which
   we operate.  GC is the graphics context to set clipping in.
   WHOLE_LINE_P non-zero means include the areas used for truncation
   mark display and alike in the clipping rectangle.

   ROW may be a text row or, e.g., a mode line.  Text rows must be
   clipped to the interior of the window dedicated to text display,
   mode lines must be clipped to the whole window.  */

static void
x_clip_to_row (w, row, gc, whole_line_p)
     struct window *w;
     struct glyph_row *row;
     GC gc;
     int whole_line_p;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  XRectangle clip_rect;
  int window_x, window_y, window_width, window_height;

  window_box (w, -1, &window_x, &window_y, &window_width, &window_height);

  clip_rect.x = WINDOW_TO_FRAME_PIXEL_X (w, 0);
  clip_rect.y = WINDOW_TO_FRAME_PIXEL_Y (w, row->y);
  clip_rect.y = max (clip_rect.y, window_y);
  clip_rect.width = window_width;
  clip_rect.height = row->visible_height;

  /* If clipping to the whole line, including trunc marks, extend
     the rectangle to the left and increase its width.  */
  if (whole_line_p)
    {
      clip_rect.x -= FRAME_X_FLAGS_AREA_WIDTH (f);
      clip_rect.width += 2 * FRAME_X_FLAGS_AREA_WIDTH (f);
    }

  XSetClipRectangles (FRAME_X_DISPLAY (f), gc, 0, 0, &clip_rect, 1, Unsorted);
}


/* Draw a hollow box cursor on window W in glyph row ROW.  */

static void
x_draw_hollow_cursor (w, row)
     struct window *w;
     struct glyph_row *row;
{
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  Display *dpy = FRAME_X_DISPLAY (f);
  int x, y, wd, h;
  XGCValues xgcv;
  struct glyph *cursor_glyph;
  GC gc;

  /* Compute frame-relative coordinates from window-relative
     coordinates.  */
  x = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, w->phys_cursor.x);
  y = (WINDOW_TO_FRAME_PIXEL_Y (w, w->phys_cursor.y)
       + row->ascent - w->phys_cursor_ascent);
  h = row->height - 1;

  /* Get the glyph the cursor is on.  If we can't tell because
     the current matrix is invalid or such, give up.  */
  cursor_glyph = get_phys_cursor_glyph (w);
  if (cursor_glyph == NULL)
    return;

  /* Compute the width of the rectangle to draw.  If on a stretch
     glyph, and `x-stretch-block-cursor' is nil, don't draw a
     rectangle as wide as the glyph, but use a canonical character
     width instead.  */
  wd = cursor_glyph->pixel_width - 1;
  if (cursor_glyph->type == STRETCH_GLYPH
      && !x_stretch_cursor_p)
    wd = min (CANON_X_UNIT (f), wd);
  
  /* The foreground of cursor_gc is typically the same as the normal
     background color, which can cause the cursor box to be invisible.  */
  xgcv.foreground = f->output_data.x->cursor_pixel;
  if (dpyinfo->scratch_cursor_gc)
    XChangeGC (dpy, dpyinfo->scratch_cursor_gc, GCForeground, &xgcv);
  else
    dpyinfo->scratch_cursor_gc = XCreateGC (dpy, FRAME_X_WINDOW (f),
                                            GCForeground, &xgcv);
  gc = dpyinfo->scratch_cursor_gc;

  /* Set clipping, draw the rectangle, and reset clipping again.  */
  x_clip_to_row (w, row, gc, 0);
  XDrawRectangle (dpy, FRAME_X_WINDOW (f), gc, x, y, wd, h);
  XSetClipMask (dpy, gc, None);
}


/* Draw a bar cursor on window W in glyph row ROW.

   Implementation note: One would like to draw a bar cursor with an
   angle equal to the one given by the font property XA_ITALIC_ANGLE.
   Unfortunately, I didn't find a font yet that has this property set.
   --gerd.  */

static void
x_draw_bar_cursor (w, row)
     struct window *w;
     struct glyph_row *row;
{
  /* If cursor hpos is out of bounds, don't draw garbage.  This can
     happen in mini-buffer windows when switching between echo area
     glyphs and mini-buffer.  */
  if (w->phys_cursor.hpos < row->used[TEXT_AREA])
    {
      struct frame *f = XFRAME (w->frame);
      struct glyph *cursor_glyph;
      GC gc;
      int x;
      unsigned long mask;
      XGCValues xgcv;
      Display *dpy;
      Window window;
      
      cursor_glyph = get_phys_cursor_glyph (w);
      if (cursor_glyph == NULL)
        return;

      xgcv.background = f->output_data.x->cursor_pixel;
      xgcv.foreground = f->output_data.x->cursor_pixel;
      xgcv.graphics_exposures = 0;
      mask = GCForeground | GCBackground | GCGraphicsExposures;
      dpy = FRAME_X_DISPLAY (f);
      window = FRAME_X_WINDOW (f);
      gc = FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc;
      
      if (gc)
        XChangeGC (dpy, gc, mask, &xgcv);
      else
        {
          gc = XCreateGC (dpy, window, mask, &xgcv);
          FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc = gc;
        }

      x = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, w->phys_cursor.x);
      x_clip_to_row (w, row, gc, 0);
      XFillRectangle (dpy, window, gc,
                      x,
                      WINDOW_TO_FRAME_PIXEL_Y (w, w->phys_cursor.y),
                      min (cursor_glyph->pixel_width,
                           f->output_data.x->cursor_width),
                      row->height);
      XSetClipMask (dpy, gc, None);
    }
}


/* Clear the cursor of window W to background color, and mark the
   cursor as not shown.  This is used when the text where the cursor
   is is about to be rewritten.  */

static void
x_clear_cursor (w)
     struct window *w;
{
  if (FRAME_VISIBLE_P (XFRAME (w->frame)) && w->phys_cursor_on_p)
    x_update_window_cursor (w, 0);
}


/* Draw the cursor glyph of window W in glyph row ROW.  See the
   comment of x_draw_glyphs for the meaning of HL.  */

static void
x_draw_phys_cursor_glyph (w, row, hl)
     struct window *w;
     struct glyph_row *row;
     enum draw_glyphs_face hl;
{
  /* If cursor hpos is out of bounds, don't draw garbage.  This can
     happen in mini-buffer windows when switching between echo area
     glyphs and mini-buffer.  */
  if (w->phys_cursor.hpos < row->used[TEXT_AREA])
    x_draw_glyphs (w, w->phys_cursor.x, row, TEXT_AREA,
                   w->phys_cursor.hpos, w->phys_cursor.hpos + 1, hl, 0, 0);
}


/* Erase the image of a cursor of window W from the screen.  */

static void
x_erase_phys_cursor (w)
     struct window *w;
{
  struct frame *f = XFRAME (w->frame);
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int hpos = w->phys_cursor.hpos;
  int vpos = w->phys_cursor.vpos;
  int mouse_face_here_p = 0;
  struct glyph_matrix *active_glyphs = w->current_matrix;
  struct glyph_row *cursor_row;
  struct glyph *cursor_glyph;
  enum draw_glyphs_face hl;

  /* No cursor displayed or row invalidated => nothing to do on the
     screen.  */
  if (w->phys_cursor_type == NO_CURSOR)
    goto mark_cursor_off;
           
  /* VPOS >= active_glyphs->nrows means that window has been resized.
     Don't bother to erase the cursor.  */
  if (vpos >= active_glyphs->nrows)
    goto mark_cursor_off;

  /* If row containing cursor is marked invalid, there is nothing we
     can do.  */
  cursor_row = MATRIX_ROW (active_glyphs, vpos);
  if (!cursor_row->enabled_p)
    goto mark_cursor_off;
  
  /* This can happen when the new row is shorter than the old one.
     In this case, either x_draw_glyphs or clear_end_of_line
     should have cleared the cursor.  Note that we wouldn't be
     able to erase the cursor in this case because we don't have a
     cursor glyph at hand.  */
  if (w->phys_cursor.hpos >= cursor_row->used[TEXT_AREA])
    goto mark_cursor_off;
         
  /* If the cursor is in the mouse face area, redisplay that when
     we clear the cursor.  */
  if (w == XWINDOW (dpyinfo->mouse_face_window)
      && (vpos > dpyinfo->mouse_face_beg_row
          || (vpos == dpyinfo->mouse_face_beg_row
              && hpos >= dpyinfo->mouse_face_beg_col))
      && (vpos < dpyinfo->mouse_face_end_row
          || (vpos == dpyinfo->mouse_face_end_row
              && hpos < dpyinfo->mouse_face_end_col))
      /* Don't redraw the cursor's spot in mouse face if it is at the
         end of a line (on a newline).  The cursor appears there, but
         mouse highlighting does not.  */
      && cursor_row->used[TEXT_AREA] > hpos)
    mouse_face_here_p = 1;

  /* Maybe clear the display under the cursor.  */
  if (w->phys_cursor_type == HOLLOW_BOX_CURSOR)
    {
      int x;
      int top_line_height = WINDOW_DISPLAY_TOP_LINE_HEIGHT (w);

      cursor_glyph = get_phys_cursor_glyph (w);
      if (cursor_glyph == NULL)
        goto mark_cursor_off;

      x = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, w->phys_cursor.x),
      
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                  x,
                  WINDOW_TO_FRAME_PIXEL_Y (w, max (top_line_height,
                                                   cursor_row->y)),
                  cursor_glyph->pixel_width,
                  cursor_row->visible_height,
                  False);
    }
  
  /* Erase the cursor by redrawing the character underneath it.  */
  if (mouse_face_here_p)
    hl = DRAW_MOUSE_FACE;
  else if (cursor_row->inverse_p)
    hl = DRAW_INVERSE_VIDEO;
  else
    hl = DRAW_NORMAL_TEXT;
  x_draw_phys_cursor_glyph (w, cursor_row, hl);

 mark_cursor_off:
  w->phys_cursor_on_p = 0;
  w->phys_cursor_type = NO_CURSOR;
}


/* Display or clear cursor of window W.  If ON is zero, clear the
   cursor.  If it is non-zero, display the cursor.  If ON is nonzero,
   where to put the cursor is specified by HPOS, VPOS, X and Y.  */

void
x_display_and_set_cursor (w, on, hpos, vpos, x, y)
     struct window *w;
     int on, hpos, vpos, x, y;
{
  struct frame *f = XFRAME (w->frame);
  int new_cursor_type;
  struct glyph_matrix *current_glyphs;
  struct glyph_row *glyph_row;
  struct glyph *glyph;

  /* This is pointless on invisible frames, and dangerous on garbaged
     windows and frames; in the latter case, the frame or window may
     be in the midst of changing its size, and x and y may be off the
     window.  */
  if (! FRAME_VISIBLE_P (f)
      || FRAME_GARBAGED_P (f)
      || vpos >= w->current_matrix->nrows
      || hpos >= w->current_matrix->matrix_w)
    return;

  /* If cursor is off and we want it off, return quickly.  */
  if (!on && !w->phys_cursor_on_p)
    return;

  current_glyphs = w->current_matrix;
  glyph_row = MATRIX_ROW (current_glyphs, vpos);
  glyph = glyph_row->glyphs[TEXT_AREA] + hpos;
  
  /* If cursor row is not enabled, we don't really know where to 
     display the cursor.  */
  if (!glyph_row->enabled_p)
    {
      w->phys_cursor_on_p = 0;
      return;
    }

  xassert (interrupt_input_blocked);

  /* Set new_cursor_type to the cursor we want to be displayed.  In a
     mini-buffer window, we want the cursor only to appear if we are
     reading input from this window.  For the selected window, we want
     the cursor type given by the frame parameter.  If explicitly
     marked off, draw no cursor.  In all other cases, we want a hollow
     box cursor.  */
  if (w != XWINDOW (selected_window)
      || f != FRAME_X_DISPLAY_INFO (f)->x_highlight_frame)
    {
      if (MINI_WINDOW_P (w))
        new_cursor_type = NO_CURSOR;
      else
        new_cursor_type = HOLLOW_BOX_CURSOR;
    }
  else if (w->cursor_off_p)
    new_cursor_type = NO_CURSOR;
  else
    new_cursor_type = FRAME_DESIRED_CURSOR (f);

  /* If cursor is currently being shown and we don't want it to be or
     it is in the wrong place, or the cursor type is not what we want,
     erase it.  */
  if (w->phys_cursor_on_p
      && (!on
          || w->phys_cursor.x != x
          || w->phys_cursor.y != y
          || new_cursor_type != w->phys_cursor_type))
    x_erase_phys_cursor (w);

  /* If the cursor is now invisible and we want it to be visible,
     display it.  */
  if (on && !w->phys_cursor_on_p)
    {
      w->phys_cursor_ascent = glyph_row->ascent;
      w->phys_cursor_height = glyph_row->height;
      
      /* Set phys_cursor_.* before x_draw_.* is called because some
         of them may need the information.  */
      w->phys_cursor.x = x;
      w->phys_cursor.y = glyph_row->y;
      w->phys_cursor.hpos = hpos;
      w->phys_cursor.vpos = vpos;
      w->phys_cursor_type = new_cursor_type;
      w->phys_cursor_on_p = 1;

      switch (new_cursor_type)
        {
        case HOLLOW_BOX_CURSOR:
          x_draw_hollow_cursor (w, glyph_row);
          break;

        case FILLED_BOX_CURSOR:
          x_draw_phys_cursor_glyph (w, glyph_row, DRAW_CURSOR);
          break;

        case BAR_CURSOR:
          x_draw_bar_cursor (w, glyph_row);
          break;

        case NO_CURSOR:
          break;

        default:
          abort ();
        }
    }

#ifndef XFlush
  if (updating_frame != f)
    XFlush (FRAME_X_DISPLAY (f));
#endif
}


/* Display the cursor on window W, or clear it.  X and Y are window
   relative pixel coordinates.  HPOS and VPOS are glyph matrix
   positions.  If W is not the selected window, display a hollow
   cursor.  ON non-zero means display the cursor at X, Y which
   correspond to HPOS, VPOS, otherwise it is cleared.  */

void
x_display_cursor (w, on, hpos, vpos, x, y)
     struct window *w;
     int on, hpos, vpos, x, y;
{
  BLOCK_INPUT;
  x_display_and_set_cursor (w, on, hpos, vpos, x, y);
  UNBLOCK_INPUT;
}


/* Display the cursor on window W, or clear it, according to ON_P.
   Don't change the cursor's position.  */

void
x_update_cursor (f, on_p)
     struct frame *f;
{
  x_update_cursor_in_window_tree (XWINDOW (f->root_window), on_p);
}


/* Call x_update_window_cursor with parameter ON_P on all leaf windows
   in the window tree rooted at W.  */

static void
x_update_cursor_in_window_tree (w, on_p)
     struct window *w;
     int on_p;
{
  while (w)
    {
      if (!NILP (w->hchild))
        x_update_cursor_in_window_tree (XWINDOW (w->hchild), on_p);
      else if (!NILP (w->vchild))
        x_update_cursor_in_window_tree (XWINDOW (w->vchild), on_p);
      else
        x_update_window_cursor (w, on_p);

      w = NILP (w->next) ? 0 : XWINDOW (w->next);
    }
}


/* Switch the display of W's cursor on or off, according to the value
   of ON.  */

static void
x_update_window_cursor (w, on)
     struct window *w;
     int on;
{
  BLOCK_INPUT;
  x_display_and_set_cursor (w, on, w->phys_cursor.hpos, w->phys_cursor.vpos,
                            w->phys_cursor.x, w->phys_cursor.y);
  UNBLOCK_INPUT;
}



\f
/* Icons.  */

/* Refresh bitmap kitchen sink icon for frame F
   when we get an expose event for it.  */

void
refreshicon (f)
     struct frame *f;
{
  /* Normally, the window manager handles this function.  */
}

/* Make the x-window of frame F use the gnu icon bitmap.  */

int
x_bitmap_icon (f, file)
     struct frame *f;
     Lisp_Object file;
{
  int bitmap_id;

  if (FRAME_X_WINDOW (f) == 0)
    return 1;

  /* Free up our existing icon bitmap if any.  */
  if (f->output_data.x->icon_bitmap > 0)
    x_destroy_bitmap (f, f->output_data.x->icon_bitmap);
  f->output_data.x->icon_bitmap = 0;

  if (STRINGP (file))
    bitmap_id = x_create_bitmap_from_file (f, file);
  else
    {
      /* Create the GNU bitmap if necessary.  */
      if (FRAME_X_DISPLAY_INFO (f)->icon_bitmap_id < 0)
        FRAME_X_DISPLAY_INFO (f)->icon_bitmap_id
          = x_create_bitmap_from_data (f, gnu_bits,
                                       gnu_width, gnu_height);

      /* The first time we create the GNU bitmap,
         this increments the ref-count one extra time.
         As a result, the GNU bitmap is never freed.
         That way, we don't have to worry about allocating it again.  */
      x_reference_bitmap (f, FRAME_X_DISPLAY_INFO (f)->icon_bitmap_id);

      bitmap_id = FRAME_X_DISPLAY_INFO (f)->icon_bitmap_id;
    }

  x_wm_set_icon_pixmap (f, bitmap_id);
  f->output_data.x->icon_bitmap = bitmap_id;

  return 0;
}


/* Make the x-window of frame F use a rectangle with text.
   Use ICON_NAME as the text.  */

int
x_text_icon (f, icon_name)
     struct frame *f;
     char *icon_name;
{
  if (FRAME_X_WINDOW (f) == 0)
    return 1;

#ifdef HAVE_X11R4
  {
    XTextProperty text;
    text.value = (unsigned char *) icon_name;
    text.encoding = XA_STRING;
    text.format = 8;
    text.nitems = strlen (icon_name);
#ifdef USE_X_TOOLKIT
    XSetWMIconName (FRAME_X_DISPLAY (f), XtWindow (f->output_data.x->widget),
                    &text);
#else /* not USE_X_TOOLKIT */
    XSetWMIconName (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), &text);
#endif /* not USE_X_TOOLKIT */
  }
#else /* not HAVE_X11R4 */
  XSetIconName (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), icon_name);
#endif /* not HAVE_X11R4 */

  if (f->output_data.x->icon_bitmap > 0)
    x_destroy_bitmap (f, f->output_data.x->icon_bitmap);
  f->output_data.x->icon_bitmap = 0;
  x_wm_set_icon_pixmap (f, 0);

  return 0;
}
\f
#define X_ERROR_MESSAGE_SIZE 200

/* If non-nil, this should be a string.
   It means catch X errors  and store the error message in this string.  */

static Lisp_Object x_error_message_string;

/* An X error handler which stores the error message in
   x_error_message_string.  This is called from x_error_handler if
   x_catch_errors is in effect.  */

static void
x_error_catcher (display, error)
     Display *display;
     XErrorEvent *error;
{
  XGetErrorText (display, error->error_code,
                 XSTRING (x_error_message_string)->data,
                 X_ERROR_MESSAGE_SIZE);
}

/* Begin trapping X errors for display DPY.  Actually we trap X errors
   for all displays, but DPY should be the display you are actually
   operating on.

   After calling this function, X protocol errors no longer cause
   Emacs to exit; instead, they are recorded in the string
   stored in x_error_message_string.

   Calling x_check_errors signals an Emacs error if an X error has
   occurred since the last call to x_catch_errors or x_check_errors.

   Calling x_uncatch_errors resumes the normal error handling.  */

void x_check_errors ();
static Lisp_Object x_catch_errors_unwind ();

int
x_catch_errors (dpy)
     Display *dpy;
{
  int count = specpdl_ptr - specpdl;

  /* Make sure any errors from previous requests have been dealt with.  */
  XSync (dpy, False);

  record_unwind_protect (x_catch_errors_unwind, x_error_message_string);

  x_error_message_string = make_uninit_string (X_ERROR_MESSAGE_SIZE);
  XSTRING (x_error_message_string)->data[0] = 0;

  return count;
}

/* Unbind the binding that we made to check for X errors.  */

static Lisp_Object
x_catch_errors_unwind (old_val)
     Lisp_Object old_val;
{
  x_error_message_string = old_val;
  return Qnil;
}

/* If any X protocol errors have arrived since the last call to
   x_catch_errors or x_check_errors, signal an Emacs error using
   sprintf (a buffer, FORMAT, the x error message text) as the text.  */

void
x_check_errors (dpy, format)
     Display *dpy;
     char *format;
{
  /* Make sure to catch any errors incurred so far.  */
  XSync (dpy, False);

  if (XSTRING (x_error_message_string)->data[0])
    error (format, XSTRING (x_error_message_string)->data);
}

/* Nonzero if we had any X protocol errors
   since we did x_catch_errors on DPY.  */

int
x_had_errors_p (dpy)
     Display *dpy;
{
  /* Make sure to catch any errors incurred so far.  */
  XSync (dpy, False);

  return XSTRING (x_error_message_string)->data[0] != 0;
}

/* Forget about any errors we have had, since we did x_catch_errors on DPY.  */

void
x_clear_errors (dpy)
     Display *dpy;
{
  XSTRING (x_error_message_string)->data[0] = 0;
}

/* Stop catching X protocol errors and let them make Emacs die.
   DPY should be the display that was passed to x_catch_errors.
   COUNT should be the value that was returned by
   the corresponding call to x_catch_errors.  */

void
x_uncatch_errors (dpy, count)
     Display *dpy;
     int count;
{
  unbind_to (count, Qnil);
}

#if 0
static unsigned int x_wire_count;
x_trace_wire ()
{
  fprintf (stderr, "Lib call: %d\n", ++x_wire_count);
}
#endif /* ! 0 */

\f
/* Handle SIGPIPE, which can happen when the connection to a server
   simply goes away.  SIGPIPE is handled by x_connection_signal.
   Don't need to do anything, because the write which caused the 
   SIGPIPE will fail, causing Xlib to invoke the X IO error handler,
   which will do the appropriate cleanup for us.  */
   
static SIGTYPE
x_connection_signal (signalnum) /* If we don't have an argument, */
     int signalnum;             /* some compilers complain in signal calls.  */
{
#ifdef USG
  /* USG systems forget handlers when they are used;
     must reestablish each time */
  signal (signalnum, x_connection_signal);
#endif /* USG */
}
\f
/* Handling X errors.  */

/* Handle the loss of connection to display DISPLAY.  */

static SIGTYPE
x_connection_closed (display, error_message)
     Display *display;
     char *error_message;
{
  struct x_display_info *dpyinfo = x_display_info_for_display (display);
  Lisp_Object frame, tail;

  /* Indicate that this display is dead.  */

#ifdef USE_X_TOOLKIT
  XtCloseDisplay (display);
#endif

  dpyinfo->display = 0;

  /* First delete frames whose mini-buffers are on frames
     that are on the dead display.  */
  FOR_EACH_FRAME (tail, frame)
    {
      Lisp_Object minibuf_frame;
      minibuf_frame
        = WINDOW_FRAME (XWINDOW (FRAME_MINIBUF_WINDOW (XFRAME (frame))));
      if (FRAME_X_P (XFRAME (frame))
          && FRAME_X_P (XFRAME (minibuf_frame))
          && ! EQ (frame, minibuf_frame)
          && FRAME_X_DISPLAY_INFO (XFRAME (minibuf_frame)) == dpyinfo)
        Fdelete_frame (frame, Qt);
    }

  /* Now delete all remaining frames on the dead display.
     We are now sure none of these is used as the mini-buffer
     for another frame that we need to delete.  */
  FOR_EACH_FRAME (tail, frame)
    if (FRAME_X_P (XFRAME (frame))
        && FRAME_X_DISPLAY_INFO (XFRAME (frame)) == dpyinfo)
      {
        /* Set this to t so that Fdelete_frame won't get confused
           trying to find a replacement.  */
        FRAME_KBOARD (XFRAME (frame))->Vdefault_minibuffer_frame = Qt;
        Fdelete_frame (frame, Qt);
      }

  if (dpyinfo)
    x_delete_display (dpyinfo);

  if (x_display_list == 0)
    {
      fprintf (stderr, "%s\n", error_message);
      shut_down_emacs (0, 0, Qnil);
      exit (70);
    }

  /* Ordinary stack unwind doesn't deal with these.  */
#ifdef SIGIO
  sigunblock (sigmask (SIGIO));
#endif
  sigunblock (sigmask (SIGALRM));
  TOTALLY_UNBLOCK_INPUT;

  clear_waiting_for_input ();
  error ("%s", error_message);
}

/* This is the usual handler for X protocol errors.
   It kills all frames on the display that we got the error for.
   If that was the only one, it prints an error message and kills Emacs.  */

static void
x_error_quitter (display, error)
     Display *display;
     XErrorEvent *error;
{
  char buf[256], buf1[356];

  /* Note that there is no real way portable across R3/R4 to get the
     original error handler.  */

  XGetErrorText (display, error->error_code, buf, sizeof (buf));
  sprintf (buf1, "X protocol error: %s on protocol request %d",
           buf, error->request_code);
  x_connection_closed (display, buf1);
}

/* This is the first-level handler for X protocol errors.
   It calls x_error_quitter or x_error_catcher.  */

static int
x_error_handler (display, error)
     Display *display;
     XErrorEvent *error;
{
  if (! NILP (x_error_message_string))
    x_error_catcher (display, error);
  else
    x_error_quitter (display, error);
  return 0;
}

/* This is the handler for X IO errors, always.
   It kills all frames on the display that we lost touch with.
   If that was the only one, it prints an error message and kills Emacs.  */

static int
x_io_error_quitter (display)
     Display *display;
{
  char buf[256];

  sprintf (buf, "Connection lost to X server `%s'", DisplayString (display));
  x_connection_closed (display, buf);
  return 0;
}
\f
/* Changing the font of the frame.  */

/* Give frame F the font named FONTNAME as its default font, and
   return the full name of that font.  FONTNAME may be a wildcard
   pattern; in that case, we choose some font that fits the pattern.
   The return value shows which font we chose.  */

Lisp_Object
x_new_font (f, fontname)
     struct frame *f;
     register char *fontname;
{
  struct font_info *fontp
    = fs_load_font (f, FRAME_X_FONT_TABLE (f), CHARSET_ASCII, fontname, -1);

  if (!fontp)
    return Qnil;

  f->output_data.x->font = (XFontStruct *) (fontp->font);
  f->output_data.x->font_baseline
    = (f->output_data.x->font->ascent + fontp->baseline_offset);
  f->output_data.x->fontset = -1;
  
  /* Compute the scroll bar width in character columns.  */
  if (f->scroll_bar_pixel_width > 0)
    {
      int wid = FONT_WIDTH (f->output_data.x->font);
      f->scroll_bar_cols = (f->scroll_bar_pixel_width + wid-1) / wid;
    }
  else
    {
      int wid = FONT_WIDTH (f->output_data.x->font);
      f->scroll_bar_cols = (14 + wid - 1) / wid;
    }

  /* Now make the frame display the given font.  */
  if (FRAME_X_WINDOW (f) != 0)
    {
      XSetFont (FRAME_X_DISPLAY (f), f->output_data.x->normal_gc,
                f->output_data.x->font->fid);
      XSetFont (FRAME_X_DISPLAY (f), f->output_data.x->reverse_gc,
                f->output_data.x->font->fid);
      XSetFont (FRAME_X_DISPLAY (f), f->output_data.x->cursor_gc,
                f->output_data.x->font->fid);

      frame_update_line_height (f);
      x_set_window_size (f, 0, f->width, f->height);
    }
  else
    /* If we are setting a new frame's font for the first time,
       there are no faces yet, so this font's height is the line height.  */
    f->output_data.x->line_height = FONT_HEIGHT (f->output_data.x->font);

  return build_string (fontp->full_name);
}

/* Give frame F the fontset named FONTSETNAME as its default font, and
   return the full name of that fontset.  FONTSETNAME may be a wildcard
   pattern; in that case, we choose some fontset that fits the pattern.
   The return value shows which fontset we chose.  */

Lisp_Object
x_new_fontset (f, fontsetname)
     struct frame *f;
     char *fontsetname;
{
  int fontset = fs_query_fontset (f, fontsetname);
  struct fontset_info *fontsetp;
  Lisp_Object result;

  if (fontset < 0)
    return Qnil;

  if (f->output_data.x->fontset == fontset)
    /* This fontset is already set in frame F.  There's nothing more
       to do.  */
    return build_string (fontsetname);

  fontsetp = FRAME_FONTSET_DATA (f)->fontset_table[fontset];

  if (!fontsetp->fontname[CHARSET_ASCII])
    /* This fontset doesn't contain ASCII font.  */
    return Qnil;

  result = x_new_font (f, fontsetp->fontname[CHARSET_ASCII]);

  if (!STRINGP (result))
    /* Can't load ASCII font.  */
    return Qnil;

  /* Since x_new_font doesn't update any fontset information, do it now.  */
  f->output_data.x->fontset = fontset;
  FS_LOAD_FONT (f, FRAME_X_FONT_TABLE (f),
                CHARSET_ASCII, fontsetp->fontname[CHARSET_ASCII], fontset);

  return build_string (fontsetname);
}
\f
/* Calculate the absolute position in frame F
   from its current recorded position values and gravity.  */

void
x_calc_absolute_position (f)
     struct frame *f;
{
  Window child;
  int win_x = 0, win_y = 0;
  int flags = f->output_data.x->size_hint_flags;
  int this_window;

  /* We have nothing to do if the current position
     is already for the top-left corner.  */
  if (! ((flags & XNegative) || (flags & YNegative)))
    return;

#ifdef USE_X_TOOLKIT
  this_window = XtWindow (f->output_data.x->widget);
#else
  this_window = FRAME_X_WINDOW (f);
#endif

  /* Find the position of the outside upper-left corner of
     the inner window, with respect to the outer window.
     But do this only if we will need the results.  */
  if (f->output_data.x->parent_desc != FRAME_X_DISPLAY_INFO (f)->root_window)
    {
      int count;

      BLOCK_INPUT;
      count = x_catch_errors (FRAME_X_DISPLAY (f));
      while (1)
        {
          x_clear_errors (FRAME_X_DISPLAY (f));
          XTranslateCoordinates (FRAME_X_DISPLAY (f),

                                 /* From-window, to-window.  */
                                 this_window,
                                 f->output_data.x->parent_desc,

                                 /* From-position, to-position.  */
                                 0, 0, &win_x, &win_y,

                                 /* Child of win.  */
                                 &child);
          if (x_had_errors_p (FRAME_X_DISPLAY (f)))
            {
              Window newroot, newparent = 0xdeadbeef;
              Window *newchildren;
              int nchildren;

              if (! XQueryTree (FRAME_X_DISPLAY (f), this_window, &newroot,
                                &newparent, &newchildren, &nchildren))
                break;

              XFree ((char *) newchildren);

              f->output_data.x->parent_desc = newparent;
            }
          else
            break;
        }

      x_uncatch_errors (FRAME_X_DISPLAY (f), count);
      UNBLOCK_INPUT;
    }

  /* Treat negative positions as relative to the leftmost bottommost
     position that fits on the screen.  */
  if (flags & XNegative)
    f->output_data.x->left_pos = (FRAME_X_DISPLAY_INFO (f)->width
                                  - 2 * f->output_data.x->border_width - win_x
                                  - PIXEL_WIDTH (f)
                                  + f->output_data.x->left_pos);

  if (flags & YNegative)
    {
      int menubar_height = 0;

#ifdef USE_X_TOOLKIT
      if (f->output_data.x->menubar_widget)
        menubar_height
          = (f->output_data.x->menubar_widget->core.height
             + f->output_data.x->menubar_widget->core.border_width);
#endif
      
      f->output_data.x->top_pos = (FRAME_X_DISPLAY_INFO (f)->height
                                   - 2 * f->output_data.x->border_width
                                   - win_y
                                   - PIXEL_HEIGHT (f)
                                   - menubar_height
                                   + f->output_data.x->top_pos);
    }

  /* The left_pos and top_pos
     are now relative to the top and left screen edges,
     so the flags should correspond.  */
  f->output_data.x->size_hint_flags &= ~ (XNegative | YNegative);
}

/* CHANGE_GRAVITY is 1 when calling from Fset_frame_position,
   to really change the position, and 0 when calling from
   x_make_frame_visible (in that case, XOFF and YOFF are the current
   position values).  It is -1 when calling from x_set_frame_parameters,
   which means, do adjust for borders but don't change the gravity.  */

void
x_set_offset (f, xoff, yoff, change_gravity)
     struct frame *f;
     register int xoff, yoff;
     int change_gravity;
{
  int modified_top, modified_left;

  if (change_gravity > 0)
    {
      f->output_data.x->top_pos = yoff;
      f->output_data.x->left_pos = xoff;
      f->output_data.x->size_hint_flags &= ~ (XNegative | YNegative);
      if (xoff < 0)
        f->output_data.x->size_hint_flags |= XNegative;
      if (yoff < 0)
        f->output_data.x->size_hint_flags |= YNegative;
      f->output_data.x->win_gravity = NorthWestGravity;
    }
  x_calc_absolute_position (f);

  BLOCK_INPUT;
  x_wm_set_size_hint (f, (long) 0, 0);

  modified_left = f->output_data.x->left_pos;
  modified_top = f->output_data.x->top_pos;
#if 0 /* Running on psilocin (Debian), and displaying on the NCD X-terminal,
         this seems to be unnecessary and incorrect.  rms, 4/17/97.  */
  /* It is a mystery why we need to add the border_width here
     when the frame is already visible, but experiment says we do.  */
  if (change_gravity != 0)
    {
      modified_left += f->output_data.x->border_width;
      modified_top += f->output_data.x->border_width;
    }
#endif

#ifdef USE_X_TOOLKIT
  XMoveWindow (FRAME_X_DISPLAY (f), XtWindow (f->output_data.x->widget),
               modified_left, modified_top);
#else /* not USE_X_TOOLKIT */
  XMoveWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
               modified_left, modified_top);
#endif /* not USE_X_TOOLKIT */
  UNBLOCK_INPUT;
}

/* Call this to change the size of frame F's x-window.
   If CHANGE_GRAVITY is 1, we change to top-left-corner window gravity
   for this size change and subsequent size changes.
   Otherwise we leave the window gravity unchanged.  */

void
x_set_window_size (f, change_gravity, cols, rows)
     struct frame *f;
     int change_gravity;
     int cols, rows;
{
#ifndef USE_X_TOOLKIT
  int pixelwidth, pixelheight;
#endif

  BLOCK_INPUT;

#ifdef USE_X_TOOLKIT
  {
    /* The x and y position of the widget is clobbered by the
       call to XtSetValues within EmacsFrameSetCharSize.
       This is a real kludge, but I don't understand Xt so I can't
       figure out a correct fix.  Can anyone else tell me? -- rms.  */
    int xpos = f->output_data.x->widget->core.x;
    int ypos = f->output_data.x->widget->core.y;
    EmacsFrameSetCharSize (f->output_data.x->edit_widget, cols, rows);
    f->output_data.x->widget->core.x = xpos;
    f->output_data.x->widget->core.y = ypos;
  }

#else /* not USE_X_TOOLKIT */

  check_frame_size (f, &rows, &cols);
  f->output_data.x->vertical_scroll_bar_extra
    = (!FRAME_HAS_VERTICAL_SCROLL_BARS (f)
       ? 0
       : FRAME_SCROLL_BAR_PIXEL_WIDTH (f) > 0
       ? FRAME_SCROLL_BAR_PIXEL_WIDTH (f)
       : (FRAME_SCROLL_BAR_COLS (f) * FONT_WIDTH (f->output_data.x->font)));
  f->output_data.x->flags_areas_extra
    = 2 * FRAME_FLAGS_AREA_WIDTH (f);
  pixelwidth = CHAR_TO_PIXEL_WIDTH (f, cols);
  pixelheight = CHAR_TO_PIXEL_HEIGHT (f, rows);

  f->output_data.x->win_gravity = NorthWestGravity;
  x_wm_set_size_hint (f, (long) 0, 0);

  XSync (FRAME_X_DISPLAY (f), False);
  XResizeWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                 pixelwidth, pixelheight);

  /* Now, strictly speaking, we can't be sure that this is accurate,
     but the window manager will get around to dealing with the size
     change request eventually, and we'll hear how it went when the
     ConfigureNotify event gets here.

     We could just not bother storing any of this information here,
     and let the ConfigureNotify event set everything up, but that
     might be kind of confusing to the lisp code, since size changes
     wouldn't be reported in the frame parameters until some random
     point in the future when the ConfigureNotify event arrives.  */
  change_frame_size (f, rows, cols, 0, 0);
  PIXEL_WIDTH (f) = pixelwidth;
  PIXEL_HEIGHT (f) = pixelheight;

  /* We've set {FRAME,PIXEL}_{WIDTH,HEIGHT} to the values we hope to
     receive in the ConfigureNotify event; if we get what we asked
     for, then the event won't cause the screen to become garbaged, so
     we have to make sure to do it here.  */
  SET_FRAME_GARBAGED (f);

  XFlush (FRAME_X_DISPLAY (f));

#endif /* not USE_X_TOOLKIT */

  /* If cursor was outside the new size, mark it as off.  */
  mark_window_cursors_off (XWINDOW (f->root_window));

  /* Clear out any recollection of where the mouse highlighting was,
     since it might be in a place that's outside the new frame size. 
     Actually checking whether it is outside is a pain in the neck,
     so don't try--just let the highlighting be done afresh with new size.  */
  cancel_mouse_face (f);

  UNBLOCK_INPUT;
}
\f
/* Mouse warping.  */

void
x_set_mouse_position (f, x, y)
     struct frame *f;
     int x, y;
{
  int pix_x, pix_y;

  pix_x = CHAR_TO_PIXEL_COL (f, x) + FONT_WIDTH  (f->output_data.x->font) / 2;
  pix_y = CHAR_TO_PIXEL_ROW (f, y) + f->output_data.x->line_height / 2;

  if (pix_x < 0) pix_x = 0;
  if (pix_x > PIXEL_WIDTH (f)) pix_x = PIXEL_WIDTH (f);

  if (pix_y < 0) pix_y = 0;
  if (pix_y > PIXEL_HEIGHT (f)) pix_y = PIXEL_HEIGHT (f);

  BLOCK_INPUT;

  XWarpPointer (FRAME_X_DISPLAY (f), None, FRAME_X_WINDOW (f),
                0, 0, 0, 0, pix_x, pix_y);
  UNBLOCK_INPUT;
}

/* Move the mouse to position pixel PIX_X, PIX_Y relative to frame F.  */

void
x_set_mouse_pixel_position (f, pix_x, pix_y)
     struct frame *f;
     int pix_x, pix_y;
{
  BLOCK_INPUT;

  XWarpPointer (FRAME_X_DISPLAY (f), None, FRAME_X_WINDOW (f),
                0, 0, 0, 0, pix_x, pix_y);
  UNBLOCK_INPUT;
}
\f
/* focus shifting, raising and lowering.  */

void
x_focus_on_frame (f)
     struct frame *f;
{
#if 0  /* This proves to be unpleasant.  */
  x_raise_frame (f);
#endif
#if 0
  /* I don't think that the ICCCM allows programs to do things like this
     without the interaction of the window manager.  Whatever you end up
     doing with this code, do it to x_unfocus_frame too.  */
  XSetInputFocus (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                  RevertToPointerRoot, CurrentTime);
#endif /* ! 0 */
}

void
x_unfocus_frame (f)
     struct frame *f;
{
#if 0
  /* Look at the remarks in x_focus_on_frame.  */
  if (FRAME_X_DISPLAY_INFO (f)->x_focus_frame == f)
    XSetInputFocus (FRAME_X_DISPLAY (f), PointerRoot,
                    RevertToPointerRoot, CurrentTime);
#endif /* ! 0 */
}

/* Raise frame F.  */

void
x_raise_frame (f)
     struct frame *f;
{
  if (f->async_visible)
    {
      BLOCK_INPUT;
#ifdef USE_X_TOOLKIT
      XRaiseWindow (FRAME_X_DISPLAY (f), XtWindow (f->output_data.x->widget));
#else /* not USE_X_TOOLKIT */
      XRaiseWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
#endif /* not USE_X_TOOLKIT */
      XFlush (FRAME_X_DISPLAY (f));
      UNBLOCK_INPUT;
    }
}

/* Lower frame F.  */

void
x_lower_frame (f)
     struct frame *f;
{
  if (f->async_visible)
    {
      BLOCK_INPUT;
#ifdef USE_X_TOOLKIT
      XLowerWindow (FRAME_X_DISPLAY (f), XtWindow (f->output_data.x->widget));
#else /* not USE_X_TOOLKIT */
      XLowerWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
#endif /* not USE_X_TOOLKIT */
      XFlush (FRAME_X_DISPLAY (f));
      UNBLOCK_INPUT;
    }
}

static void
XTframe_raise_lower (f, raise_flag)
     FRAME_PTR f;
     int raise_flag;
{
  if (raise_flag)
    x_raise_frame (f);
  else
    x_lower_frame (f);
}
\f
/* Change of visibility.  */

/* This tries to wait until the frame is really visible.
   However, if the window manager asks the user where to position
   the frame, this will return before the user finishes doing that.
   The frame will not actually be visible at that time,
   but it will become visible later when the window manager
   finishes with it.  */

void
x_make_frame_visible (f)
     struct frame *f;
{
  Lisp_Object type;
  int original_top, original_left;

  BLOCK_INPUT;

  type = x_icon_type (f);
  if (!NILP (type))
    x_bitmap_icon (f, type);

  if (! FRAME_VISIBLE_P (f))
    {
      /* We test FRAME_GARBAGED_P here to make sure we don't
         call x_set_offset a second time
         if we get to x_make_frame_visible a second time
         before the window gets really visible.  */
      if (! FRAME_ICONIFIED_P (f)
          && ! f->output_data.x->asked_for_visible)
        x_set_offset (f, f->output_data.x->left_pos, f->output_data.x->top_pos, 0);

      f->output_data.x->asked_for_visible = 1;

      if (! EQ (Vx_no_window_manager, Qt))
        x_wm_set_window_state (f, NormalState);
#ifdef USE_X_TOOLKIT
      /* This was XtPopup, but that did nothing for an iconified frame.  */
      XtMapWidget (f->output_data.x->widget);
#else /* not USE_X_TOOLKIT */
      XMapRaised (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
#endif /* not USE_X_TOOLKIT */
#if 0 /* This seems to bring back scroll bars in the wrong places
         if the window configuration has changed.  They seem
         to come back ok without this.  */
      if (FRAME_HAS_VERTICAL_SCROLL_BARS (f))
        XMapSubwindows (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
#endif
    }

  XFlush (FRAME_X_DISPLAY (f));

  /* Synchronize to ensure Emacs knows the frame is visible
     before we do anything else.  We do this loop with input not blocked
     so that incoming events are handled.  */
  {
    Lisp_Object frame;
    int count = input_signal_count;
    /* This must be before UNBLOCK_INPUT
       since events that arrive in response to the actions above
       will set it when they are handled.  */
    int previously_visible = f->output_data.x->has_been_visible;

    original_left = f->output_data.x->left_pos;
    original_top = f->output_data.x->top_pos;

    /* This must come after we set COUNT.  */
    UNBLOCK_INPUT;

    /* We unblock here so that arriving X events are processed.  */

    /* Now move the window back to where it was "supposed to be".
       But don't do it if the gravity is negative.
       When the gravity is negative, this uses a position
       that is 3 pixels too low.  Perhaps that's really the border width.

       Don't do this if the window has never been visible before,
       because the window manager may choose the position
       and we don't want to override it.  */

    if (! FRAME_VISIBLE_P (f) && ! FRAME_ICONIFIED_P (f)
        && f->output_data.x->win_gravity == NorthWestGravity
        && previously_visible)
      {
        Drawable rootw;
        int x, y;
        unsigned int width, height, border, depth;
        
        BLOCK_INPUT;

        /* On some window managers (such as FVWM) moving an existing
           window, even to the same place, causes the window manager
           to introduce an offset.  This can cause the window to move
           to an unexpected location.  Check the geometry (a little
           slow here) and then verify that the window is in the right
           place.  If the window is not in the right place, move it
           there, and take the potential window manager hit.  */
        XGetGeometry (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f),
                      &rootw, &x, &y, &width, &height, &border, &depth);

        if (original_left != x || original_top != y)
          XMoveWindow (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f),
                       original_left, original_top);

        UNBLOCK_INPUT;
      }

    XSETFRAME (frame, f);

    while (1)
      {
        x_sync (f);
        /* Once we have handled input events,
           we should have received the MapNotify if one is coming.
           So if we have not got it yet, stop looping.
           Some window managers make their own decisions
           about visibility.  */
        if (input_signal_count != count)
          break;
        /* Machines that do polling rather than SIGIO have been observed
           to go into a busy-wait here.  So we'll fake an alarm signal
           to let the handler know that there's something to be read.
           We used to raise a real alarm, but it seems that the handler
           isn't always enabled here.  This is probably a bug.  */
        if (input_polling_used ())
          {
            /* It could be confusing if a real alarm arrives while processing
               the fake one.  Turn it off and let the handler reset it.  */
            alarm (0);
            input_poll_signal (0);
          }
        /* Once we have handled input events,
           we should have received the MapNotify if one is coming.
           So if we have not got it yet, stop looping.
           Some window managers make their own decisions
           about visibility.  */
        if (input_signal_count != count)
          break;
      }
    FRAME_SAMPLE_VISIBILITY (f);
  }
}

/* Change from mapped state to withdrawn state.  */

/* Make the frame visible (mapped and not iconified).  */

void
x_make_frame_invisible (f)
     struct frame *f;
{
  Window window;

#ifdef USE_X_TOOLKIT
  /* Use the frame's outermost window, not the one we normally draw on.  */
  window = XtWindow (f->output_data.x->widget);
#else /* not USE_X_TOOLKIT */
  window = FRAME_X_WINDOW (f);
#endif /* not USE_X_TOOLKIT */

  /* Don't keep the highlight on an invisible frame.  */
  if (FRAME_X_DISPLAY_INFO (f)->x_highlight_frame == f)
    FRAME_X_DISPLAY_INFO (f)->x_highlight_frame = 0;

#if 0/* This might add unreliability; I don't trust it -- rms.  */
  if (! f->async_visible && ! f->async_iconified)
    return;
#endif

  BLOCK_INPUT;

  /* Before unmapping the window, update the WM_SIZE_HINTS property to claim
     that the current position of the window is user-specified, rather than
     program-specified, so that when the window is mapped again, it will be
     placed at the same location, without forcing the user to position it
     by hand again (they have already done that once for this window.)  */
  x_wm_set_size_hint (f, (long) 0, 1);

#ifdef HAVE_X11R4

  if (! XWithdrawWindow (FRAME_X_DISPLAY (f), window,
                         DefaultScreen (FRAME_X_DISPLAY (f))))
    {
      UNBLOCK_INPUT_RESIGNAL;
      error ("Can't notify window manager of window withdrawal");
    }
#else /* ! defined (HAVE_X11R4) */

  /*  Tell the window manager what we're going to do.  */
  if (! EQ (Vx_no_window_manager, Qt))
    {
      XEvent unmap;

      unmap.xunmap.type = UnmapNotify;
      unmap.xunmap.window = window;
      unmap.xunmap.event = DefaultRootWindow (FRAME_X_DISPLAY (f));
      unmap.xunmap.from_configure = False;
      if (! XSendEvent (FRAME_X_DISPLAY (f),
                        DefaultRootWindow (FRAME_X_DISPLAY (f)),
                        False,
                        SubstructureRedirectMaskSubstructureNotifyMask,
                        &unmap))
        {
          UNBLOCK_INPUT_RESIGNAL;
          error ("Can't notify window manager of withdrawal");
        }
    }

  /* Unmap the window ourselves.  Cheeky!  */
  XUnmapWindow (FRAME_X_DISPLAY (f), window);
#endif /* ! defined (HAVE_X11R4) */

  /* We can't distinguish this from iconification
     just by the event that we get from the server.
     So we can't win using the usual strategy of letting
     FRAME_SAMPLE_VISIBILITY set this.  So do it by hand,
     and synchronize with the server to make sure we agree.  */
  f->visible = 0;
  FRAME_ICONIFIED_P (f) = 0;
  f->async_visible = 0;
  f->async_iconified = 0;

  x_sync (f);

  UNBLOCK_INPUT;
}

/* Change window state from mapped to iconified.  */

void
x_iconify_frame (f)
     struct frame *f;
{
  int result;
  Lisp_Object type;

  /* Don't keep the highlight on an invisible frame.  */
  if (FRAME_X_DISPLAY_INFO (f)->x_highlight_frame == f)
    FRAME_X_DISPLAY_INFO (f)->x_highlight_frame = 0;

  if (f->async_iconified)
    return;

  BLOCK_INPUT;

  FRAME_SAMPLE_VISIBILITY (f);

  type = x_icon_type (f);
  if (!NILP (type))
    x_bitmap_icon (f, type);

#ifdef USE_X_TOOLKIT

  if (! FRAME_VISIBLE_P (f))
    {
      if (! EQ (Vx_no_window_manager, Qt))
        x_wm_set_window_state (f, IconicState);
      /* This was XtPopup, but that did nothing for an iconified frame.  */
      XtMapWidget (f->output_data.x->widget);
      /* The server won't give us any event to indicate
         that an invisible frame was changed to an icon,
         so we have to record it here.  */
      f->iconified = 1;
      f->visible = 1;
      f->async_iconified = 1;
      f->async_visible = 0;
      UNBLOCK_INPUT;
      return;
    }

  result = XIconifyWindow (FRAME_X_DISPLAY (f),
                           XtWindow (f->output_data.x->widget),
                           DefaultScreen (FRAME_X_DISPLAY (f)));
  UNBLOCK_INPUT;

  if (!result)
    error ("Can't notify window manager of iconification");

  f->async_iconified = 1;
  f->async_visible = 0;


  BLOCK_INPUT;
  XFlush (FRAME_X_DISPLAY (f));
  UNBLOCK_INPUT;
#else /* not USE_X_TOOLKIT */

  /* Make sure the X server knows where the window should be positioned,
     in case the user deiconifies with the window manager.  */
  if (! FRAME_VISIBLE_P (f) && !FRAME_ICONIFIED_P (f))
    x_set_offset (f, f->output_data.x->left_pos, f->output_data.x->top_pos, 0);

  /* Since we don't know which revision of X we're running, we'll use both
     the X11R3 and X11R4 techniques.  I don't know if this is a good idea.  */

  /* X11R4: send a ClientMessage to the window manager using the
     WM_CHANGE_STATE type.  */
  {
    XEvent message;

    message.xclient.window = FRAME_X_WINDOW (f);
    message.xclient.type = ClientMessage;
    message.xclient.message_type = FRAME_X_DISPLAY_INFO (f)->Xatom_wm_change_state;
    message.xclient.format = 32;
    message.xclient.data.l[0] = IconicState;

    if (! XSendEvent (FRAME_X_DISPLAY (f),
                      DefaultRootWindow (FRAME_X_DISPLAY (f)),
                      False,
                      SubstructureRedirectMask | SubstructureNotifyMask,
                      &message))
      {
        UNBLOCK_INPUT_RESIGNAL;
        error ("Can't notify window manager of iconification");
      }
  }

  /* X11R3: set the initial_state field of the window manager hints to
     IconicState.  */
  x_wm_set_window_state (f, IconicState);

  if (!FRAME_VISIBLE_P (f))
    {
      /* If the frame was withdrawn, before, we must map it.  */
      XMapRaised (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
    }

  f->async_iconified = 1;
  f->async_visible = 0;

  XFlush (FRAME_X_DISPLAY (f));
  UNBLOCK_INPUT;
#endif /* not USE_X_TOOLKIT */
}
\f
/* Destroy the X window of frame F.  */

void
x_destroy_window (f)
     struct frame *f;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);

  BLOCK_INPUT;

  /* If a display connection is dead, don't try sending more
     commands to the X server.  */
  if (dpyinfo->display != 0)
    {
      if (f->output_data.x->icon_desc != 0)
        XDestroyWindow (FRAME_X_DISPLAY (f), f->output_data.x->icon_desc);
#ifdef HAVE_X_I18N
      if (FRAME_XIM (f))
        {
          XDestroyIC (FRAME_XIC (f));
#if ! defined (SOLARIS2) || defined (HAVE_X11R6)
          /* This line causes crashes on Solaris with Openwin,
             due to an apparent bug in XCloseIM.
             X11R6 seems not to have the bug.  */
          XCloseIM (FRAME_XIM (f));
#endif
        }
#endif
      XDestroyWindow (FRAME_X_DISPLAY (f), f->output_data.x->window_desc);
#ifdef USE_X_TOOLKIT
      if (f->output_data.x->widget)
        XtDestroyWidget (f->output_data.x->widget);
      free_frame_menubar (f);
#endif /* USE_X_TOOLKIT */

      free_frame_faces (f);
      XFlush (FRAME_X_DISPLAY (f));
    }

  if (f->output_data.x->saved_menu_event)
    xfree (f->output_data.x->saved_menu_event);

  xfree (f->output_data.x);
  f->output_data.x = 0;
  if (f == dpyinfo->x_focus_frame)
    dpyinfo->x_focus_frame = 0;
  if (f == dpyinfo->x_focus_event_frame)
    dpyinfo->x_focus_event_frame = 0;
  if (f == dpyinfo->x_highlight_frame)
    dpyinfo->x_highlight_frame = 0;

  dpyinfo->reference_count--;

  if (f == dpyinfo->mouse_face_mouse_frame)
    {
      dpyinfo->mouse_face_beg_row
        = dpyinfo->mouse_face_beg_col = -1;
      dpyinfo->mouse_face_end_row
        = dpyinfo->mouse_face_end_col = -1;
      dpyinfo->mouse_face_window = Qnil;
      dpyinfo->mouse_face_deferred_gc = 0;
      dpyinfo->mouse_face_mouse_frame = 0;
    }

  UNBLOCK_INPUT;
}
\f
/* Setting window manager hints.  */

/* Set the normal size hints for the window manager, for frame F.
   FLAGS is the flags word to use--or 0 meaning preserve the flags
   that the window now has.
   If USER_POSITION is nonzero, we set the USPosition
   flag (this is useful when FLAGS is 0).  */

void
x_wm_set_size_hint (f, flags, user_position)
     struct frame *f;
     long flags;
     int user_position;
{
  XSizeHints size_hints;

#ifdef USE_X_TOOLKIT
  Arg al[2];
  int ac = 0;
  Dimension widget_width, widget_height;
  Window window = XtWindow (f->output_data.x->widget);
#else /* not USE_X_TOOLKIT */
  Window window = FRAME_X_WINDOW (f);
#endif /* not USE_X_TOOLKIT */

  /* Setting PMaxSize caused various problems.  */
  size_hints.flags = PResizeInc | PMinSize /* | PMaxSize */;

  size_hints.x = f->output_data.x->left_pos;
  size_hints.y = f->output_data.x->top_pos;

#ifdef USE_X_TOOLKIT
  XtSetArg (al[ac], XtNwidth, &widget_width); ac++;
  XtSetArg (al[ac], XtNheight, &widget_height); ac++;
  XtGetValues (f->output_data.x->widget, al, ac);
  size_hints.height = widget_height;
  size_hints.width = widget_width;
#else /* not USE_X_TOOLKIT */
  size_hints.height = PIXEL_HEIGHT (f);
  size_hints.width = PIXEL_WIDTH (f);
#endif /* not USE_X_TOOLKIT */

  size_hints.width_inc = FONT_WIDTH (f->output_data.x->font);
  size_hints.height_inc = f->output_data.x->line_height;
  size_hints.max_width
    = FRAME_X_DISPLAY_INFO (f)->width - CHAR_TO_PIXEL_WIDTH (f, 0);
  size_hints.max_height
    = FRAME_X_DISPLAY_INFO (f)->height - CHAR_TO_PIXEL_HEIGHT (f, 0);

  /* Calculate the base and minimum sizes.

     (When we use the X toolkit, we don't do it here.
     Instead we copy the values that the widgets are using, below.)  */
#ifndef USE_X_TOOLKIT
  {
    int base_width, base_height;
    int min_rows = 0, min_cols = 0;

    base_width = CHAR_TO_PIXEL_WIDTH (f, 0);
    base_height = CHAR_TO_PIXEL_HEIGHT (f, 0);

    check_frame_size (f, &min_rows, &min_cols);

    /* The window manager uses the base width hints to calculate the
       current number of rows and columns in the frame while
       resizing; min_width and min_height aren't useful for this
       purpose, since they might not give the dimensions for a
       zero-row, zero-column frame.

       We use the base_width and base_height members if we have
       them; otherwise, we set the min_width and min_height members
       to the size for a zero x zero frame.  */

#ifdef HAVE_X11R4
    size_hints.flags |= PBaseSize;
    size_hints.base_width = base_width;
    size_hints.base_height = base_height;
    size_hints.min_width  = base_width + min_cols * size_hints.width_inc;
    size_hints.min_height = base_height + min_rows * size_hints.height_inc;
#else
    size_hints.min_width = base_width;
    size_hints.min_height = base_height;
#endif
  }

  /* If we don't need the old flags, we don't need the old hint at all.  */
  if (flags)
    {
      size_hints.flags |= flags;
      goto no_read;
    }
#endif /* not USE_X_TOOLKIT */

  {
    XSizeHints hints;           /* Sometimes I hate X Windows... */
    long supplied_return;
    int value;

#ifdef HAVE_X11R4
    value = XGetWMNormalHints (FRAME_X_DISPLAY (f), window, &hints,
                               &supplied_return);
#else
    value = XGetNormalHints (FRAME_X_DISPLAY (f), window, &hints);
#endif

#ifdef USE_X_TOOLKIT
    size_hints.base_height = hints.base_height;
    size_hints.base_width = hints.base_width;
    size_hints.min_height = hints.min_height;
    size_hints.min_width = hints.min_width;
#endif

    if (flags)
      size_hints.flags |= flags;
    else
      {
        if (value == 0)
          hints.flags = 0;
        if (hints.flags & PSize)
          size_hints.flags |= PSize;
        if (hints.flags & PPosition)
          size_hints.flags |= PPosition;
        if (hints.flags & USPosition)
          size_hints.flags |= USPosition;
        if (hints.flags & USSize)
          size_hints.flags |= USSize;
      }
  }

#ifndef USE_X_TOOLKIT
 no_read:
#endif

#ifdef PWinGravity
  size_hints.win_gravity = f->output_data.x->win_gravity;
  size_hints.flags |= PWinGravity;

  if (user_position)
    {
      size_hints.flags &= ~ PPosition;
      size_hints.flags |= USPosition;
    }
#endif /* PWinGravity */

#ifdef HAVE_X11R4
  XSetWMNormalHints (FRAME_X_DISPLAY (f), window, &size_hints);
#else
  XSetNormalHints (FRAME_X_DISPLAY (f), window, &size_hints);
#endif
}

/* Used for IconicState or NormalState */

void
x_wm_set_window_state (f, state)
     struct frame *f;
     int state;
{
#ifdef USE_X_TOOLKIT
  Arg al[1];

  XtSetArg (al[0], XtNinitialState, state);
  XtSetValues (f->output_data.x->widget, al, 1);
#else /* not USE_X_TOOLKIT */
  Window window = FRAME_X_WINDOW (f);

  f->output_data.x->wm_hints.flags |= StateHint;
  f->output_data.x->wm_hints.initial_state = state;

  XSetWMHints (FRAME_X_DISPLAY (f), window, &f->output_data.x->wm_hints);
#endif /* not USE_X_TOOLKIT */
}

void
x_wm_set_icon_pixmap (f, pixmap_id)
     struct frame *f;
     int pixmap_id;
{
  Pixmap icon_pixmap;

#ifndef USE_X_TOOLKIT
  Window window = FRAME_X_WINDOW (f);
#endif

  if (pixmap_id > 0)
    {
      icon_pixmap = x_bitmap_pixmap (f, pixmap_id);
      f->output_data.x->wm_hints.icon_pixmap = icon_pixmap;
    }
  else
    {
      /* It seems there is no way to turn off use of an icon pixmap.
         The following line does it, only if no icon has yet been created,
         for some window managers.  But with mwm it crashes.
         Some people say it should clear the IconPixmapHint bit in this case,
         but that doesn't work, and the X consortium said it isn't the
         right thing at all.  Since there is no way to win,
         best to explicitly give up.  */
#if 0
      f->output_data.x->wm_hints.icon_pixmap = None;
#else
      return;
#endif
    }

#ifdef USE_X_TOOLKIT /* same as in x_wm_set_window_state.  */

  {
    Arg al[1];
    XtSetArg (al[0], XtNiconPixmap, icon_pixmap);
    XtSetValues (f->output_data.x->widget, al, 1);
  }

#else /* not USE_X_TOOLKIT */
  
  f->output_data.x->wm_hints.flags |= IconPixmapHint;
  XSetWMHints (FRAME_X_DISPLAY (f), window, &f->output_data.x->wm_hints);

#endif /* not USE_X_TOOLKIT */
}

void
x_wm_set_icon_position (f, icon_x, icon_y)
     struct frame *f;
     int icon_x, icon_y;
{
#ifdef USE_X_TOOLKIT
  Window window = XtWindow (f->output_data.x->widget);
#else
  Window window = FRAME_X_WINDOW (f);
#endif

  f->output_data.x->wm_hints.flags |= IconPositionHint;
  f->output_data.x->wm_hints.icon_x = icon_x;
  f->output_data.x->wm_hints.icon_y = icon_y;

  XSetWMHints (FRAME_X_DISPLAY (f), window, &f->output_data.x->wm_hints);
}

\f
/***********************************************************************
                                Fonts
 ***********************************************************************/

/* Return a pointer to struct font_info of font FONT_IDX of frame F.  */

struct font_info *
x_get_font_info (f, font_idx)
     FRAME_PTR f;
     int font_idx;
{
  return (FRAME_X_FONT_TABLE (f) + font_idx);
}


/* Return a list of names of available fonts matching PATTERN on frame
   F.  If SIZE is not 0, it is the size (maximum bound width) of fonts
   to be listed.  Frame F NULL means we have not yet created any
   frame on X, and consult the first display in x_display_list.
   MAXNAMES sets a limit on how many fonts to match.  */

Lisp_Object
x_list_fonts (f, pattern, size, maxnames)
     FRAME_PTR f;
     Lisp_Object pattern;
     int size;
     int maxnames;
{
  Lisp_Object list = Qnil, patterns, newlist = Qnil, key = Qnil;
  Lisp_Object tem, second_best;
  Display *dpy = f != NULL ? FRAME_X_DISPLAY (f) : x_display_list->display;
  int try_XLoadQueryFont = 0;
  int count;

  patterns = Fassoc (pattern, Valternate_fontname_alist);
  if (NILP (patterns))
    patterns = Fcons (pattern, Qnil);

  if (maxnames == 1 && !size)
    /* We can return any single font matching PATTERN.  */
    try_XLoadQueryFont = 1;

  for (; CONSP (patterns); patterns = XCONS (patterns)->cdr)
    {
      int num_fonts;
      char **names;

      pattern = XCONS (patterns)->car;
      /* See if we cached the result for this particular query.
         The cache is an alist of the form:
           (((PATTERN . MAXNAMES) (FONTNAME . WIDTH) ...) ...)
      */
      if (f && (tem = XCONS (FRAME_X_DISPLAY_INFO (f)->name_list_element)->cdr,
                key = Fcons (pattern, make_number (maxnames)),
                !NILP (list = Fassoc (key, tem))))
        {
          list = Fcdr_safe (list);
          /* We have a cashed list.  Don't have to get the list again.  */
          goto label_cached;
        }

      /* At first, put PATTERN in the cache.  */

      BLOCK_INPUT;
      count = x_catch_errors (dpy);

      if (try_XLoadQueryFont)
        {
          XFontStruct *font;
          unsigned long value;

          font = XLoadQueryFont (dpy, XSTRING (pattern)->data);
          if (x_had_errors_p (dpy))
            {
              /* This error is perhaps due to insufficient memory on X
                 server.  Let's just ignore it.  */
              font = NULL;
              x_clear_errors (dpy);
            }

          if (font
              && XGetFontProperty (font, XA_FONT, &value))
            {
              char *name = (char *) XGetAtomName (dpy, (Atom) value);
              int len = strlen (name);
              char *tmp;

              /* If DXPC (a Differential X Protocol Compressor)
                 Ver.3.7 is running, XGetAtomName will return null
                 string.  We must avoid such a name.  */
              if (len == 0)
                try_XLoadQueryFont = 0;
              else
                {
                  num_fonts = 1;
                  names = (char **) alloca (sizeof (char *));
                  /* Some systems only allow alloca assigned to a
                     simple var.  */
                  tmp = (char *) alloca (len + 1);  names[0] = tmp;
                  bcopy (name, names[0], len + 1);
                  XFree (name);
                }
            }
          else
            try_XLoadQueryFont = 0;

          if (font)
            XFreeFont (dpy, font);
        }

      if (!try_XLoadQueryFont)
        {
          /* We try at least 10 fonts because XListFonts will return
             auto-scaled fonts at the head.  */
          names = XListFonts (dpy, XSTRING (pattern)->data, max (maxnames, 10),
                              &num_fonts);
          if (x_had_errors_p (dpy))
            {
              /* This error is perhaps due to insufficient memory on X
                 server.  Let's just ignore it.  */
              names = NULL;
              x_clear_errors (dpy);
            }
        }

      x_uncatch_errors (dpy, count);
      UNBLOCK_INPUT;

      if (names)
        {
          int i;

          /* Make a list of all the fonts we got back.
             Store that in the font cache for the display.  */
          for (i = 0; i < num_fonts; i++)
            {
              int width = 0;
              char *p = names[i];
              int average_width = -1, dashes = 0;
              
              /* Count the number of dashes in NAMES[I].  If there are
                14 dashes, and the field value following 12th dash
                (AVERAGE_WIDTH) is 0, this is a auto-scaled font which
                is usually too ugly to be used for editing.  Let's
                ignore it.  */
              while (*p)
                if (*p++ == '-')
                  {
                    dashes++;
                    if (dashes == 7) /* PIXEL_SIZE field */
                      width = atoi (p);
                    else if (dashes == 12) /* AVERAGE_WIDTH field */
                      average_width = atoi (p);
                  }
              if (dashes < 14 || average_width != 0)
                {
                  tem = build_string (names[i]);
                  if (NILP (Fassoc (tem, list)))
                    {
                      if (STRINGP (Vx_pixel_size_width_font_regexp)
                          && ((fast_c_string_match_ignore_case
                               (Vx_pixel_size_width_font_regexp, names[i]))
                              >= 0))
                        /* We can set the value of PIXEL_SIZE to the
                          width of this font.  */
                        list = Fcons (Fcons (tem, make_number (width)), list);
                      else
                        /* For the moment, width is not known.  */
                        list = Fcons (Fcons (tem, Qnil), list);
                    }
                }
            }
          if (!try_XLoadQueryFont)
            XFreeFontNames (names);
        }

      /* Now store the result in the cache.  */
      if (f != NULL)
        XCONS (FRAME_X_DISPLAY_INFO (f)->name_list_element)->cdr
          = Fcons (Fcons (key, list),
                   XCONS (FRAME_X_DISPLAY_INFO (f)->name_list_element)->cdr);

    label_cached:
      if (NILP (list)) continue; /* Try the remaining alternatives.  */

      newlist = second_best = Qnil;
      /* Make a list of the fonts that have the right width.  */
      for (; CONSP (list); list = XCONS (list)->cdr)
        {
          int found_size;

          tem = XCONS (list)->car;

          if (!CONSP (tem) || NILP (XCONS (tem)->car))
            continue;
          if (!size)
            {
              newlist = Fcons (XCONS (tem)->car, newlist);
              continue;
            }

          if (!INTEGERP (XCONS (tem)->cdr))
            {
              /* Since we have not yet known the size of this font, we
                must try slow function call XLoadQueryFont.  */
              XFontStruct *thisinfo;

              BLOCK_INPUT;
              count = x_catch_errors (dpy);
              thisinfo = XLoadQueryFont (dpy,
                                         XSTRING (XCONS (tem)->car)->data);
              if (x_had_errors_p (dpy))
                {
                  /* This error is perhaps due to insufficient memory on X
                     server.  Let's just ignore it.  */
                  thisinfo = NULL;
                  x_clear_errors (dpy);
                }
              x_uncatch_errors (dpy, count);
              UNBLOCK_INPUT;

              if (thisinfo)
                {
                  XCONS (tem)->cdr
                    = (thisinfo->min_bounds.width == 0
                       ? make_number (0)
                       : make_number (thisinfo->max_bounds.width));
                  XFreeFont (dpy, thisinfo);
                }
              else
                /* For unknown reason, the previous call of XListFont had
                  returned a font which can't be opened.  Record the size
                  as 0 not to try to open it again.  */
                XCONS (tem)->cdr = make_number (0);
            }

          found_size = XINT (XCONS (tem)->cdr);
          if (found_size == size)
            newlist = Fcons (XCONS (tem)->car, newlist);
          else if (found_size > 0)
            {
              if (NILP (second_best))
                second_best = tem;
              else if (found_size < size)
                {
                  if (XINT (XCONS (second_best)->cdr) > size
                      || XINT (XCONS (second_best)->cdr) < found_size)
                    second_best = tem;
                }
              else
                {
                  if (XINT (XCONS (second_best)->cdr) > size
                      && XINT (XCONS (second_best)->cdr) > found_size)
                    second_best = tem;
                }
            }
        }
      if (!NILP (newlist))
        break;
      else if (!NILP (second_best))
        {
          newlist = Fcons (XCONS (second_best)->car, Qnil);
          break;
        }
    }

  return newlist;
}  


#if GLYPH_DEBUG

/* Check that FONT is valid on frame F.  It is if it can be found in F's
   font table.  */

static void
x_check_font (f, font)
     struct frame *f;
     XFontStruct *font;
{
  int i;
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);

  xassert (font != NULL);

  for (i = 0; i < dpyinfo->n_fonts; i++)
    if (dpyinfo->font_table[i].name 
        && font == dpyinfo->font_table[i].font)
      break;

  xassert (i < dpyinfo->n_fonts);
}

#endif /* GLYPH_DEBUG != 0 */

/* Set *W to the minimum width, *H to the minimum font height of FONT.
   Note: There are (broken) X fonts out there with invalid XFontStruct
   min_bounds contents.  For example, handa@etl.go.jp reports that
   "-adobe-courier-medium-r-normal--*-180-*-*-m-*-iso8859-1" fonts
   have font->min_bounds.width == 0.  */

static INLINE void
x_font_min_bounds (font, w, h)
     XFontStruct *font;
     int *w, *h;
{
  *h = FONT_HEIGHT (font);
  *w = font->min_bounds.width;

  /* Try to handle the case where FONT->min_bounds has invalid
     contents.  Since the only font known to have invalid min_bounds
     is fixed-width, use max_bounds if min_bounds seems to be invalid.  */
  if (*w <= 0)
    *w = font->max_bounds.width;
}


/* Compute the smallest character width and smallest font height over
   all fonts available on frame F.  Set the members smallest_char_width
   and smallest_font_height in F's x_display_info structure to
   the values computed.  Value is non-zero if smallest_font_height or
   smallest_char_width become smaller than they were before.  */

static int
x_compute_min_glyph_bounds (f)
     struct frame *f;
{
  int i;
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  XFontStruct *font;
  int old_width = dpyinfo->smallest_char_width;
  int old_height = dpyinfo->smallest_font_height;
  
  dpyinfo->smallest_font_height = 100000;
  dpyinfo->smallest_char_width = 100000;
  
  for (i = 0; i < dpyinfo->n_fonts; ++i)
    if (dpyinfo->font_table[i].name)
      {
        struct font_info *fontp = dpyinfo->font_table + i;
        int w, h;
        
        font = (XFontStruct *) fontp->font;
        xassert (font != (XFontStruct *) ~0);
        x_font_min_bounds (font, &w, &h);
        
        dpyinfo->smallest_font_height = min (dpyinfo->smallest_font_height, h);
        dpyinfo->smallest_char_width = min (dpyinfo->smallest_char_width, w);
      }

  xassert (dpyinfo->smallest_char_width > 0
           && dpyinfo->smallest_font_height > 0);

  return (dpyinfo->n_fonts == 1
          || dpyinfo->smallest_char_width < old_width
          || dpyinfo->smallest_font_height < old_height);
}


/* Load font named FONTNAME of the size SIZE for frame F, and return a
   pointer to the structure font_info while allocating it dynamically.
   If SIZE is 0, load any size of font.
   If loading is failed, return NULL.  */

struct font_info *
x_load_font (f, fontname, size)
     struct frame *f;
     register char *fontname;
     int size;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  Lisp_Object font_names;
  int count;

  /* Get a list of all the fonts that match this name.  Once we
     have a list of matching fonts, we compare them against the fonts
     we already have by comparing names.  */
  font_names = x_list_fonts (f, build_string (fontname), size, 1);

  if (!NILP (font_names))
    {
      Lisp_Object tail;
      int i;

      for (i = 0; i < dpyinfo->n_fonts; i++)
        for (tail = font_names; CONSP (tail); tail = XCONS (tail)->cdr)
          if (dpyinfo->font_table[i].name
              && (!strcmp (dpyinfo->font_table[i].name,
                           XSTRING (XCONS (tail)->car)->data)
                  || !strcmp (dpyinfo->font_table[i].full_name,
                              XSTRING (XCONS (tail)->car)->data)))
            return (dpyinfo->font_table + i);
    }

  /* Load the font and add it to the table.  */
  {
    char *full_name;
    XFontStruct *font;
    struct font_info *fontp;
    unsigned long value;
    int i;

    /* If we have found fonts by x_list_font, load one of them.  If
       not, we still try to load a font by the name given as FONTNAME
       because XListFonts (called in x_list_font) of some X server has
       a bug of not finding a font even if the font surely exists and
       is loadable by XLoadQueryFont.  */
    if (size > 0 && !NILP (font_names))
      fontname = (char *) XSTRING (XCONS (font_names)->car)->data;

    BLOCK_INPUT;
    count = x_catch_errors (FRAME_X_DISPLAY (f));
    font = (XFontStruct *) XLoadQueryFont (FRAME_X_DISPLAY (f), fontname);
    if (x_had_errors_p (FRAME_X_DISPLAY (f)))
      {
        /* This error is perhaps due to insufficient memory on X
           server.  Let's just ignore it.  */
        font = NULL;
        x_clear_errors (FRAME_X_DISPLAY (f));
      }
    x_uncatch_errors (FRAME_X_DISPLAY (f), count);
    UNBLOCK_INPUT;
    if (!font)
      return NULL;

    /* Find a free slot in the font table.  */
    for (i = 0; i < dpyinfo->n_fonts; ++i)
      if (dpyinfo->font_table[i].name == NULL)
        break;

    /* If no free slot found, maybe enlarge the font table.  */
    if (i == dpyinfo->n_fonts
        && dpyinfo->n_fonts == dpyinfo->font_table_size)
      {
        int sz;
        dpyinfo->font_table_size = max (16, 2 * dpyinfo->font_table_size);
        sz = dpyinfo->font_table_size * sizeof *dpyinfo->font_table;
        dpyinfo->font_table
          = (struct font_info *) xrealloc (dpyinfo->font_table, sz);
      }

    fontp = dpyinfo->font_table + i;
    if (i == dpyinfo->n_fonts)
      ++dpyinfo->n_fonts;

    /* Now fill in the slots of *FONTP.  */
    BLOCK_INPUT;
    fontp->font = font;
    fontp->font_idx = i;
    fontp->name = (char *) xmalloc (strlen (fontname) + 1);
    bcopy (fontname, fontp->name, strlen (fontname) + 1);

    /* Try to get the full name of FONT.  Put it in FULL_NAME.  */
    full_name = 0;
    if (XGetFontProperty (font, XA_FONT, &value))
      {
        char *name = (char *) XGetAtomName (FRAME_X_DISPLAY (f), (Atom) value);
        char *p = name;
        int dashes = 0;

        /* Count the number of dashes in the "full name".
           If it is too few, this isn't really the font's full name,
           so don't use it.
           In X11R4, the fonts did not come with their canonical names
           stored in them.  */
        while (*p)
          {
            if (*p == '-')
              dashes++;
            p++;
          }

        if (dashes >= 13)
          {
            full_name = (char *) xmalloc (p - name + 1);
            bcopy (name, full_name, p - name + 1);
          }

        XFree (name);
      }
    
    if (full_name != 0)
      fontp->full_name = full_name;
    else
      fontp->full_name = fontp->name;

    fontp->size = font->max_bounds.width;
    fontp->height = FONT_HEIGHT (font);
    {
      /* For some font, ascent and descent in max_bounds field is
         larger than the above value.  */
      int max_height = font->max_bounds.ascent + font->max_bounds.descent;
      if (max_height > fontp->height)
        fontp->height = max_height;
    }

    if (NILP (font_names))
      {
        /* We come here because of a bug of XListFonts mentioned at
           the head of this block.  Let's store this information in
           the cache for x_list_fonts.  */
        Lisp_Object lispy_name = build_string (fontname);
        Lisp_Object lispy_full_name = build_string (fontp->full_name);

        XCONS (dpyinfo->name_list_element)->cdr
          = Fcons (Fcons (Fcons (lispy_name, make_number (256)),
                          Fcons (Fcons (lispy_full_name,
                                        make_number (fontp->size)),
                                 Qnil)),
                   XCONS (dpyinfo->name_list_element)->cdr);
        if (full_name)
          XCONS (dpyinfo->name_list_element)->cdr
            = Fcons (Fcons (Fcons (lispy_full_name, make_number (256)),
                            Fcons (Fcons (lispy_full_name,
                                          make_number (fontp->size)),
                                   Qnil)),
                     XCONS (dpyinfo->name_list_element)->cdr);
      }

    /* The slot `encoding' specifies how to map a character
       code-points (0x20..0x7F or 0x2020..0x7F7F) of each charset to
       the font code-points (0:0x20..0x7F, 1:0xA0..0xFF, 0:0x2020..0x7F7F,
       the font code-points (0:0x20..0x7F, 1:0xA0..0xFF,
       0:0x2020..0x7F7F, 1:0xA0A0..0xFFFF, 3:0x20A0..0x7FFF, or
       2:0xA020..0xFF7F).  For the moment, we don't know which charset
       uses this font.  So, we set information in fontp->encoding[1]
       which is never used by any charset.  If mapping can't be
       decided, set FONT_ENCODING_NOT_DECIDED.  */
    fontp->encoding[1]
      = (font->max_byte1 == 0
         /* 1-byte font */
         ? (font->min_char_or_byte2 < 0x80
            ? (font->max_char_or_byte2 < 0x80
               ? 0              /* 0x20..0x7F */
               : FONT_ENCODING_NOT_DECIDED) /* 0x20..0xFF */
            : 1)                /* 0xA0..0xFF */
         /* 2-byte font */
         : (font->min_byte1 < 0x80
            ? (font->max_byte1 < 0x80
               ? (font->min_char_or_byte2 < 0x80
                  ? (font->max_char_or_byte2 < 0x80
                     ? 0                /* 0x2020..0x7F7F */
                     : FONT_ENCODING_NOT_DECIDED) /* 0x2020..0x7FFF */
                  : 3)          /* 0x20A0..0x7FFF */
               : FONT_ENCODING_NOT_DECIDED) /* 0x20??..0xA0?? */
            : (font->min_char_or_byte2 < 0x80
               ? (font->max_char_or_byte2 < 0x80
                  ? 2           /* 0xA020..0xFF7F */
                  : FONT_ENCODING_NOT_DECIDED) /* 0xA020..0xFFFF */
               : 1)));          /* 0xA0A0..0xFFFF */

    fontp->baseline_offset
      = (XGetFontProperty (font, dpyinfo->Xatom_MULE_BASELINE_OFFSET, &value)
         ? (long) value : 0);
    fontp->relative_compose
      = (XGetFontProperty (font, dpyinfo->Xatom_MULE_RELATIVE_COMPOSE, &value)
         ? (long) value : 0);
    fontp->default_ascent
      = (XGetFontProperty (font, dpyinfo->Xatom_MULE_DEFAULT_ASCENT, &value)
         ? (long) value : 0);

    /* Set global flag fonts_changed_p to non-zero if the font loaded
       has a character with a smaller width than any other character
       before, or if the font loaded has a smalle>r height than any
       other font loaded before.  If this happens, it will make a
       glyph matrix reallocation necessary.  */
    fonts_changed_p = x_compute_min_glyph_bounds (f);
    UNBLOCK_INPUT;
    return fontp;
  }
}


/* Return a pointer to struct font_info of a font named FONTNAME for
   frame F.  If no such font is loaded, return NULL.  */

struct font_info *
x_query_font (f, fontname)
     struct frame *f;
     register char *fontname;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int i;

  for (i = 0; i < dpyinfo->n_fonts; i++)
    if (dpyinfo->font_table[i].name
        && (!strcmp (dpyinfo->font_table[i].name, fontname)
            || !strcmp (dpyinfo->font_table[i].full_name, fontname)))
      return (dpyinfo->font_table + i);
  return NULL;
}


/* Find a CCL program for a font specified by FONTP, and set the member
 `encoder' of the structure.  */

void
x_find_ccl_program (fontp)
     struct font_info *fontp;
{
  extern Lisp_Object Vfont_ccl_encoder_alist, Vccl_program_table;
  extern Lisp_Object Qccl_program_idx;
  extern Lisp_Object resolve_symbol_ccl_program ();
  Lisp_Object list, elt, ccl_prog, ccl_id;

  for (list = Vfont_ccl_encoder_alist; CONSP (list); list = XCONS (list)->cdr)
    {
      elt = XCONS (list)->car;
      if (CONSP (elt)
          && STRINGP (XCONS (elt)->car)
          && (fast_c_string_match_ignore_case (XCONS (elt)->car, fontp->name)
              >= 0))
        {
          if (SYMBOLP (XCONS (elt)->cdr) &&
              (!NILP (ccl_id = Fget (XCONS (elt)->cdr, Qccl_program_idx))))
            {
              ccl_prog = XVECTOR (Vccl_program_table)->contents[XUINT (ccl_id)];
              if (!CONSP (ccl_prog)) continue;
              ccl_prog = XCONS (ccl_prog)->cdr;
            }
          else
            {
              ccl_prog = XCONS (elt)->cdr;
              if (!VECTORP (ccl_prog)) continue;
            }
            
          fontp->font_encoder
            = (struct ccl_program *) xmalloc (sizeof (struct ccl_program));
          setup_ccl_program (fontp->font_encoder,
                             resolve_symbol_ccl_program (ccl_prog));
          break;
        }
    }
}


\f
/***********************************************************************
                            Initialization
 ***********************************************************************/

#ifdef USE_X_TOOLKIT
static XrmOptionDescRec emacs_options[] = {
  {"-geometry", ".geometry", XrmoptionSepArg, NULL},
  {"-iconic",   ".iconic", XrmoptionNoArg, (XtPointer) "yes"},

  {"-internal-border-width", "*EmacsScreen.internalBorderWidth",
     XrmoptionSepArg, NULL},
  {"-ib",       "*EmacsScreen.internalBorderWidth", XrmoptionSepArg, NULL},

  {"-T",        "*EmacsShell.title", XrmoptionSepArg, (XtPointer) NULL},
  {"-wn",       "*EmacsShell.title", XrmoptionSepArg, (XtPointer) NULL},
  {"-title",    "*EmacsShell.title", XrmoptionSepArg, (XtPointer) NULL},
  {"-iconname", "*EmacsShell.iconName", XrmoptionSepArg, (XtPointer) NULL},
  {"-in",       "*EmacsShell.iconName", XrmoptionSepArg, (XtPointer) NULL},
  {"-mc",       "*pointerColor", XrmoptionSepArg, (XtPointer) NULL},
  {"-cr",       "*cursorColor", XrmoptionSepArg, (XtPointer) NULL}
};
#endif /* USE_X_TOOLKIT */

static int x_initialized;

#ifdef MULTI_KBOARD
/* Test whether two display-name strings agree up to the dot that separates
   the screen number from the server number.  */
static int
same_x_server (name1, name2)
     char *name1, *name2;
{
  int seen_colon = 0;
  unsigned char *system_name = XSTRING (Vsystem_name)->data;
  int system_name_length = strlen (system_name);
  int length_until_period = 0;

  while (system_name[length_until_period] != 0
         && system_name[length_until_period] != '.')
    length_until_period++;

  /* Treat `unix' like an empty host name.  */
  if (! strncmp (name1, "unix:", 5))
    name1 += 4;
  if (! strncmp (name2, "unix:", 5))
    name2 += 4;
  /* Treat this host's name like an empty host name.  */
  if (! strncmp (name1, system_name, system_name_length)
      && name1[system_name_length] == ':')
    name1 += system_name_length;
  if (! strncmp (name2, system_name, system_name_length)
      && name2[system_name_length] == ':')
    name2 += system_name_length;
  /* Treat this host's domainless name like an empty host name.  */
  if (! strncmp (name1, system_name, length_until_period)
      && name1[length_until_period] == ':')
    name1 += length_until_period;
  if (! strncmp (name2, system_name, length_until_period)
      && name2[length_until_period] == ':')
    name2 += length_until_period;

  for (; *name1 != '\0' && *name1 == *name2; name1++, name2++)
    {
      if (*name1 == ':')
        seen_colon++;
      if (seen_colon && *name1 == '.')
        return 1;
    }
  return (seen_colon
          && (*name1 == '.' || *name1 == '\0')
          && (*name2 == '.' || *name2 == '\0'));
}
#endif

#if defined (HAVE_X_I18N) || (defined (USE_X_TOOLKIT) && defined (HAVE_X11XTR6))
/* Recover from setlocale (LC_ALL, "").  */
static void
fixup_locale ()
{
  /* Currently we require strerror to use the "C" locale,
     since we don't yet support decoding its string result.  */
#ifdef LC_MESSAGES
  setlocale (LC_MESSAGES, "C");
#endif

  /* The Emacs Lisp reader needs LC_NUMERIC to be "C",
     so that numbers are read and printed properly for Emacs Lisp.  */
  setlocale (LC_NUMERIC, "C");

  /* Currently we require strftime to use the "C" locale,
     since we don't yet support encoding its format argument,
     or decoding its string result.  */
  setlocale (LC_TIME, "C");
}
#endif

struct x_display_info *
x_term_init (display_name, xrm_option, resource_name)
     Lisp_Object display_name;
     char *xrm_option;
     char *resource_name;
{
  int connection;
  Display *dpy;
  struct x_display_info *dpyinfo;
  XrmDatabase xrdb;

  BLOCK_INPUT;

  if (!x_initialized)
    {
      x_initialize ();
      x_initialized = 1;
    }

#ifdef HAVE_X_I18N
  setlocale (LC_ALL, "");
  fixup_locale ();
#endif

#ifdef USE_X_TOOLKIT
  /* weiner@footloose.sps.mot.com reports that this causes
     errors with X11R5:
           X protocol error: BadAtom (invalid Atom parameter)
           on protocol request 18skiloaf.
     So let's not use it until R6.  */
#ifdef HAVE_X11XTR6
  XtSetLanguageProc (NULL, NULL, NULL);
#endif

  {
    int argc = 0;
    char *argv[3];

    argv[0] = "";
    argc = 1;
    if (xrm_option)
      {
        argv[argc++] = "-xrm";
        argv[argc++] = xrm_option;
      }
    dpy = XtOpenDisplay (Xt_app_con, XSTRING (display_name)->data,
                         resource_name, EMACS_CLASS,
                         emacs_options, XtNumber (emacs_options),
                         &argc, argv);

#ifdef HAVE_X11XTR6
    /* I think this is to compensate for XtSetLanguageProc.  */
    fixup_locale ();
#endif
  }

#else /* not USE_X_TOOLKIT */
#ifdef HAVE_X11R5
  XSetLocaleModifiers ("");
#endif
  dpy = XOpenDisplay (XSTRING (display_name)->data);
#endif /* not USE_X_TOOLKIT */

  /* Detect failure.  */
  if (dpy == 0)
    {
      UNBLOCK_INPUT;
      return 0;
    }

  /* We have definitely succeeded.  Record the new connection.  */

  dpyinfo = (struct x_display_info *) xmalloc (sizeof (struct x_display_info));

#ifdef MULTI_KBOARD
  {
    struct x_display_info *share;
    Lisp_Object tail;

    for (share = x_display_list, tail = x_display_name_list; share;
         share = share->next, tail = XCONS (tail)->cdr)
      if (same_x_server (XSTRING (XCONS (XCONS (tail)->car)->car)->data,
                         XSTRING (display_name)->data))
        break;
    if (share)
      dpyinfo->kboard = share->kboard;
    else
      {
        dpyinfo->kboard = (KBOARD *) xmalloc (sizeof (KBOARD));
        init_kboard (dpyinfo->kboard);
        if (!EQ (XSYMBOL (Qvendor_specific_keysyms)->function, Qunbound))
          {
            char *vendor = ServerVendor (dpy);
            dpyinfo->kboard->Vsystem_key_alist
              = call1 (Qvendor_specific_keysyms,
                       build_string (vendor ? vendor : ""));
          }

        dpyinfo->kboard->next_kboard = all_kboards;
        all_kboards = dpyinfo->kboard;
        /* Don't let the initial kboard remain current longer than necessary.
           That would cause problems if a file loaded on startup tries to
           prompt in the mini-buffer.  */
        if (current_kboard == initial_kboard)
          current_kboard = dpyinfo->kboard;
      }
    dpyinfo->kboard->reference_count++;
  }
#endif

  /* Put this display on the chain.  */
  dpyinfo->next = x_display_list;
  x_display_list = dpyinfo;

  /* Put it on x_display_name_list as well, to keep them parallel.  */ 
  x_display_name_list = Fcons (Fcons (display_name, Qnil),
                               x_display_name_list);
  dpyinfo->name_list_element = XCONS (x_display_name_list)->car;

  dpyinfo->display = dpy;

#if 0
  XSetAfterFunction (x_current_display, x_trace_wire);
#endif /* ! 0 */

  dpyinfo->x_id_name
    = (char *) xmalloc (STRING_BYTES (XSTRING (Vinvocation_name))
                        + STRING_BYTES (XSTRING (Vsystem_name))
                        + 2);
  sprintf (dpyinfo->x_id_name, "%s@%s",
           XSTRING (Vinvocation_name)->data, XSTRING (Vsystem_name)->data);

  /* Figure out which modifier bits mean what.  */
  x_find_modifier_meanings (dpyinfo);

  /* Get the scroll bar cursor.  */
  dpyinfo->vertical_scroll_bar_cursor
    = XCreateFontCursor (dpyinfo->display, XC_sb_v_double_arrow);

  xrdb = x_load_resources (dpyinfo->display, xrm_option,
                           resource_name, EMACS_CLASS);
#ifdef HAVE_XRMSETDATABASE
  XrmSetDatabase (dpyinfo->display, xrdb);
#else
  dpyinfo->display->db = xrdb;
#endif
  /* Put the rdb where we can find it in a way that works on
     all versions.  */
  dpyinfo->xrdb = xrdb;

  dpyinfo->screen = ScreenOfDisplay (dpyinfo->display,
                                     DefaultScreen (dpyinfo->display));
  dpyinfo->visual = select_visual (dpyinfo->display, dpyinfo->screen,
                                   &dpyinfo->n_planes);
  dpyinfo->height = HeightOfScreen (dpyinfo->screen);
  dpyinfo->width = WidthOfScreen (dpyinfo->screen);
  dpyinfo->root_window = RootWindowOfScreen (dpyinfo->screen);
  dpyinfo->grabbed = 0;
  dpyinfo->reference_count = 0;
  dpyinfo->icon_bitmap_id = -1;
  dpyinfo->font_table = NULL;
  dpyinfo->n_fonts = 0;
  dpyinfo->font_table_size = 0;
  dpyinfo->bitmaps = 0;
  dpyinfo->bitmaps_size = 0;
  dpyinfo->bitmaps_last = 0;
  dpyinfo->scratch_cursor_gc = 0;
  dpyinfo->mouse_face_mouse_frame = 0;
  dpyinfo->mouse_face_deferred_gc = 0;
  dpyinfo->mouse_face_beg_row = dpyinfo->mouse_face_beg_col = -1;
  dpyinfo->mouse_face_end_row = dpyinfo->mouse_face_end_col = -1;
  dpyinfo->mouse_face_face_id = DEFAULT_FACE_ID;
  dpyinfo->mouse_face_window = Qnil;
  dpyinfo->mouse_face_mouse_x = dpyinfo->mouse_face_mouse_y = 0;
  dpyinfo->mouse_face_defer = 0;
  dpyinfo->x_focus_frame = 0;
  dpyinfo->x_focus_event_frame = 0;
  dpyinfo->x_highlight_frame = 0;
  dpyinfo->image_cache = make_image_cache ();

  {
    int screen_number = XScreenNumberOfScreen (dpyinfo->screen);
    double pixels = DisplayHeight (dpyinfo->display, screen_number);
    double mm = DisplayHeightMM (dpyinfo->display, screen_number);
    dpyinfo->resy = pixels * 25.4 / mm;
    pixels = DisplayWidth (dpyinfo->display, screen_number);
    mm = DisplayWidthMM (dpyinfo->display, screen_number);
    dpyinfo->resx = pixels * 25.4 / mm;
  }
  
  dpyinfo->Xatom_wm_protocols
    = XInternAtom (dpyinfo->display, "WM_PROTOCOLS", False);
  dpyinfo->Xatom_wm_take_focus
    = XInternAtom (dpyinfo->display, "WM_TAKE_FOCUS", False);
  dpyinfo->Xatom_wm_save_yourself
    = XInternAtom (dpyinfo->display, "WM_SAVE_YOURSELF", False);
  dpyinfo->Xatom_wm_delete_window
    = XInternAtom (dpyinfo->display, "WM_DELETE_WINDOW", False);
  dpyinfo->Xatom_wm_change_state
    = XInternAtom (dpyinfo->display, "WM_CHANGE_STATE", False);
  dpyinfo->Xatom_wm_configure_denied
    = XInternAtom (dpyinfo->display, "WM_CONFIGURE_DENIED", False);
  dpyinfo->Xatom_wm_window_moved
    = XInternAtom (dpyinfo->display, "WM_MOVED", False);
  dpyinfo->Xatom_editres
    = XInternAtom (dpyinfo->display, "Editres", False);
  dpyinfo->Xatom_CLIPBOARD
    = XInternAtom (dpyinfo->display, "CLIPBOARD", False);
  dpyinfo->Xatom_TIMESTAMP
    = XInternAtom (dpyinfo->display, "TIMESTAMP", False);
  dpyinfo->Xatom_TEXT
    = XInternAtom (dpyinfo->display, "TEXT", False);
  dpyinfo->Xatom_COMPOUND_TEXT
    = XInternAtom (dpyinfo->display, "COMPOUND_TEXT", False);
  dpyinfo->Xatom_DELETE
    = XInternAtom (dpyinfo->display, "DELETE", False);
  dpyinfo->Xatom_MULTIPLE
    = XInternAtom (dpyinfo->display, "MULTIPLE", False);
  dpyinfo->Xatom_INCR
    = XInternAtom (dpyinfo->display, "INCR", False);
  dpyinfo->Xatom_EMACS_TMP
    = XInternAtom (dpyinfo->display, "_EMACS_TMP_", False);
  dpyinfo->Xatom_TARGETS
    = XInternAtom (dpyinfo->display, "TARGETS", False);
  dpyinfo->Xatom_NULL
    = XInternAtom (dpyinfo->display, "NULL", False);
  dpyinfo->Xatom_ATOM_PAIR
    = XInternAtom (dpyinfo->display, "ATOM_PAIR", False);
  /* For properties of font.  */
  dpyinfo->Xatom_PIXEL_SIZE
    = XInternAtom (dpyinfo->display, "PIXEL_SIZE", False);
  dpyinfo->Xatom_MULE_BASELINE_OFFSET
    = XInternAtom (dpyinfo->display, "_MULE_BASELINE_OFFSET", False);
  dpyinfo->Xatom_MULE_RELATIVE_COMPOSE
    = XInternAtom (dpyinfo->display, "_MULE_RELATIVE_COMPOSE", False);
  dpyinfo->Xatom_MULE_DEFAULT_ASCENT
    = XInternAtom (dpyinfo->display, "_MULE_DEFAULT_ASCENT", False);

  /* Ghostscript support.  */
  dpyinfo->Xatom_PAGE = XInternAtom (dpyinfo->display, "PAGE", False);
  dpyinfo->Xatom_DONE = XInternAtom (dpyinfo->display, "DONE", False);
  
  dpyinfo->Xatom_Scrollbar = XInternAtom (dpyinfo->display, "SCROLLBAR",
                                          False);

  dpyinfo->cut_buffers_initialized = 0;

  connection = ConnectionNumber (dpyinfo->display);
  dpyinfo->connection = connection;

  {
    char null_bits[1];

    null_bits[0] = 0x00;

    dpyinfo->null_pixel
      = XCreatePixmapFromBitmapData (dpyinfo->display, dpyinfo->root_window, 
                                     null_bits, 1, 1, (long) 0, (long) 0,
                                     1);
  }

  {
    extern int gray_bitmap_width, gray_bitmap_height;
    extern unsigned char *gray_bitmap_bits;
    dpyinfo->gray
      = XCreatePixmapFromBitmapData (dpyinfo->display, dpyinfo->root_window,
                                     gray_bitmap_bits,
                                     gray_bitmap_width, gray_bitmap_height,
                                     (unsigned long) 1, (unsigned long) 0, 1);
  }

#ifdef subprocesses
  /* This is only needed for distinguishing keyboard and process input.  */
  if (connection != 0)
    add_keyboard_wait_descriptor (connection);
#endif

#ifndef F_SETOWN_BUG
#ifdef F_SETOWN
#ifdef F_SETOWN_SOCK_NEG
  /* stdin is a socket here */
  fcntl (connection, F_SETOWN, -getpid ());
#else /* ! defined (F_SETOWN_SOCK_NEG) */
  fcntl (connection, F_SETOWN, getpid ());
#endif /* ! defined (F_SETOWN_SOCK_NEG) */
#endif /* ! defined (F_SETOWN) */
#endif /* F_SETOWN_BUG */

#ifdef SIGIO
  if (interrupt_input)
    init_sigio (connection);
#endif /* ! defined (SIGIO) */

#ifdef USE_LUCID
#ifdef HAVE_X11R5 /* It seems X11R4 lacks XtCvtStringToFont, and XPointer.  */
  /* Make sure that we have a valid font for dialog boxes
     so that Xt does not crash.  */
  {
    Display *dpy = dpyinfo->display;
    XrmValue d, fr, to;
    Font font;
    int count;
    
    d.addr = (XPointer)&dpy;
    d.size = sizeof (Display *);
    fr.addr = XtDefaultFont;
    fr.size = sizeof (XtDefaultFont);
    to.size = sizeof (Font *);
    to.addr = (XPointer)&font;
    count = x_catch_errors (dpy);
    if (!XtCallConverter (dpy, XtCvtStringToFont, &d, 1, &fr, &to, NULL))
      abort ();
    if (x_had_errors_p (dpy) || !XQueryFont (dpy, font))
      XrmPutLineResource (&xrdb, "Emacs.dialog.*.font: 9x15");
    x_uncatch_errors (dpy, count);
  }
#endif
#endif

  UNBLOCK_INPUT;

  return dpyinfo;
}
\f
/* Get rid of display DPYINFO, assuming all frames are already gone,
   and without sending any more commands to the X server.  */

void
x_delete_display (dpyinfo)
     struct x_display_info *dpyinfo;
{
  delete_keyboard_wait_descriptor (dpyinfo->connection);

  /* Discard this display from x_display_name_list and x_display_list.
     We can't use Fdelq because that can quit.  */
  if (! NILP (x_display_name_list)
      && EQ (XCONS (x_display_name_list)->car, dpyinfo->name_list_element))
    x_display_name_list = XCONS (x_display_name_list)->cdr;
  else
    {
      Lisp_Object tail;

      tail = x_display_name_list;
      while (CONSP (tail) && CONSP (XCONS (tail)->cdr))
        {
          if (EQ (XCONS (XCONS (tail)->cdr)->car,
                  dpyinfo->name_list_element))
            {
              XCONS (tail)->cdr = XCONS (XCONS (tail)->cdr)->cdr;
              break;
            }
          tail = XCONS (tail)->cdr;
        }
    }

  if (x_display_list == dpyinfo)
    x_display_list = dpyinfo->next;
  else
    {
      struct x_display_info *tail;

      for (tail = x_display_list; tail; tail = tail->next)
        if (tail->next == dpyinfo)
          tail->next = tail->next->next;
    }

#ifndef USE_X_TOOLKIT   /* I'm told Xt does this itself.  */
#ifndef AIX             /* On AIX, XCloseDisplay calls this.  */
  XrmDestroyDatabase (dpyinfo->xrdb);
#endif
#endif
#ifdef MULTI_KBOARD
  if (--dpyinfo->kboard->reference_count == 0)
    delete_kboard (dpyinfo->kboard);
#endif
  xfree (dpyinfo->font_table);
  xfree (dpyinfo->x_id_name);
  xfree (dpyinfo);
}
\f
/* Set up use of X before we make the first connection.  */

static struct redisplay_interface x_redisplay_interface =
{
  x_produce_glyphs,
  x_write_glyphs,
  x_insert_glyphs,
  x_clear_end_of_line,
  x_scroll_run,
  x_after_update_window_line,
  x_update_window_begin,
  x_update_window_end,
  XTcursor_to,
  x_flush,
  x_get_glyph_overhangs
};

void
x_initialize ()
{
  rif = &x_redisplay_interface;

  clear_frame_hook = x_clear_frame;
  ins_del_lines_hook = x_ins_del_lines;
  change_line_highlight_hook = x_change_line_highlight;
  delete_glyphs_hook = x_delete_glyphs;
  ring_bell_hook = XTring_bell;
  reset_terminal_modes_hook = XTreset_terminal_modes;
  set_terminal_modes_hook = XTset_terminal_modes;
  update_begin_hook = x_update_begin;
  update_end_hook = x_update_end;
  set_terminal_window_hook = XTset_terminal_window;
  read_socket_hook = XTread_socket;
  frame_up_to_date_hook = XTframe_up_to_date;
  reassert_line_highlight_hook = XTreassert_line_highlight;
  mouse_position_hook = XTmouse_position;
  frame_rehighlight_hook = XTframe_rehighlight;
  frame_raise_lower_hook = XTframe_raise_lower;
  set_vertical_scroll_bar_hook = XTset_vertical_scroll_bar;
  condemn_scroll_bars_hook = XTcondemn_scroll_bars;
  redeem_scroll_bar_hook = XTredeem_scroll_bar;
  judge_scroll_bars_hook = XTjudge_scroll_bars;
  estimate_mode_line_height_hook = x_estimate_mode_line_height;

  scroll_region_ok = 1;         /* we'll scroll partial frames */
  char_ins_del_ok = 0;          /* just as fast to write the line */
  line_ins_del_ok = 1;          /* we'll just blt 'em */
  fast_clear_end_of_line = 1;   /* X does this well */
  memory_below_frame = 0;       /* we don't remember what scrolls
                                   off the bottom */
  baud_rate = 19200;

  x_noop_count = 0;
  last_toolbar_item = -1;
  any_help_event_p = 0;
  
  /* Try to use interrupt input; if we can't, then start polling.  */
  Fset_input_mode (Qt, Qnil, Qt, Qnil);

#ifdef USE_X_TOOLKIT
  XtToolkitInitialize ();
  Xt_app_con = XtCreateApplicationContext ();
  XtAppSetFallbackResources (Xt_app_con, Xt_default_resources);
#endif

  /* Note that there is no real way portable across R3/R4 to get the
     original error handler.  */
  XSetErrorHandler (x_error_handler);
  XSetIOErrorHandler (x_io_error_quitter);

  /* Disable Window Change signals;  they are handled by X events.  */
#ifdef SIGWINCH
  signal (SIGWINCH, SIG_DFL);
#endif /* ! defined (SIGWINCH) */

  signal (SIGPIPE, x_connection_signal);
}


void
syms_of_xterm ()
{
  staticpro (&x_error_message_string);
  x_error_message_string = Qnil;

  staticpro (&x_display_name_list);
  x_display_name_list = Qnil;

  staticpro (&last_mouse_scroll_bar);
  last_mouse_scroll_bar = Qnil;

  staticpro (&Qvendor_specific_keysyms);
  Qvendor_specific_keysyms = intern ("vendor-specific-keysyms");

  staticpro (&last_mouse_press_frame);
  last_mouse_press_frame = Qnil;

  staticpro (&help_echo);
  help_echo = Qnil;
  staticpro (&previous_help_echo);
  previous_help_echo = Qnil;

  DEFVAR_BOOL ("x-stretch-cursor", &x_stretch_cursor_p,
    "*Non-nil means draw block cursor as wide as the glyph under it.\n\
For example, if a block cursor is over a tab, it will be drawn as\n\
wide as that tab on the display.");
  x_stretch_cursor_p = 0;

  DEFVAR_BOOL ("x-toolkit-scroll-bars-p", &x_toolkit_scroll_bars_p,
    "If not nil, Emacs uses toolkit scroll bars.");
#if USE_TOOLKIT_SCROLL_BARS
  x_toolkit_scroll_bars_p = 1;
#else
  x_toolkit_scroll_bars_p = 0;
#endif

  defsubr (&Sxt_process_timeouts);
  staticpro (&last_mouse_motion_frame);
  last_mouse_motion_frame = Qnil;
}

#endif /* not HAVE_X_WINDOWS */