xfns.c

/* Functions for the X window system.
   Copyright (C) 1989, 1992, 1993, 1994 Free Software Foundation.

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, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Completely rewritten by Richard Stallman.  */

/* Rewritten for X11 by Joseph Arceneaux */

#include <signal.h>
#include <config.h>

/* This makes the fields of a Display accessible, in Xlib header files.  */
#define XLIB_ILLEGAL_ACCESS

#include "lisp.h"
#include "xterm.h"
#include "frame.h"
#include "window.h"
#include "buffer.h"
#include "dispextern.h"
#include "keyboard.h"
#include "blockinput.h"
#include "paths.h"

#ifdef HAVE_X_WINDOWS
extern void abort ();

#ifndef VMS
#if 1 /* Used to be #ifdef EMACS_BITMAP_FILES, but this should always work.  */
#include "bitmaps/gray.xbm"
#else
#include <X11/bitmaps/gray>
#endif
#else
#include "[.bitmaps]gray.xbm"
#endif

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

#include <X11/Xaw/Paned.h>
#include <X11/Xaw/Label.h>

#ifdef USG
#undef USG	/* ####KLUDGE for Solaris 2.2 and up */
#include <X11/Xos.h>
#define USG
#else
#include <X11/Xos.h>
#endif

#include "widget.h"

#include "../lwlib/lwlib.h"

/* Do the EDITRES protocol if running X11R5 */
#if (XtSpecificationRelease >= 5)
#define HACK_EDITRES
extern void _XEditResCheckMessages ();
#endif /* R5 + Athena */

/* Unique id counter for widgets created by the Lucid Widget
   Library.  */
extern LWLIB_ID widget_id_tick;

/* The one and only application context associated with the connection
   to the one and only X display that Emacs uses.  */
XtAppContext Xt_app_con;

/* The one and only application shell.  Emacs screens are popup shells of this
   application.  */
Widget Xt_app_shell;

extern void free_frame_menubar ();
#endif /* USE_X_TOOLKIT */

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

#ifdef HAVE_X11R4
#define MAXREQUEST(dpy) (XMaxRequestSize (dpy))
#else
#define MAXREQUEST(dpy) ((dpy)->max_request_size)
#endif

/* The name we're using in resource queries.  */
Lisp_Object Vx_resource_name;

/* The background and shape of the mouse pointer, and shape when not
   over text or in the modeline.  */
Lisp_Object Vx_pointer_shape, Vx_nontext_pointer_shape, Vx_mode_pointer_shape;
/* The shape when over mouse-sensitive text.  */
Lisp_Object Vx_sensitive_text_pointer_shape;

/* Color of chars displayed in cursor box.  */
Lisp_Object Vx_cursor_fore_pixel;

/* Nonzero if using X.  */
static int x_in_use;

/* Non nil if no window manager is in use.  */
Lisp_Object Vx_no_window_manager;

/* Search path for bitmap files.  */
Lisp_Object Vx_bitmap_file_path;

/* Evaluate this expression to rebuild the section of syms_of_xfns
   that initializes and staticpros the symbols declared below.  Note
   that Emacs 18 has a bug that keeps C-x C-e from being able to
   evaluate this expression.

(progn
  ;; Accumulate a list of the symbols we want to initialize from the
  ;; declarations at the top of the file.
  (goto-char (point-min))
  (search-forward "/\*&&& symbols declared here &&&*\/\n")
  (let (symbol-list)
    (while (looking-at "Lisp_Object \\(Q[a-z_]+\\)")
      (setq symbol-list
	    (cons (buffer-substring (match-beginning 1) (match-end 1))
		  symbol-list))
      (forward-line 1))
    (setq symbol-list (nreverse symbol-list))
    ;; Delete the section of syms_of_... where we initialize the symbols.
    (search-forward "\n  /\*&&& init symbols here &&&*\/\n")
    (let ((start (point)))
      (while (looking-at "^  Q")
	(forward-line 2))
      (kill-region start (point)))
    ;; Write a new symbol initialization section.
    (while symbol-list
      (insert (format "  %s = intern (\"" (car symbol-list)))
      (let ((start (point)))
	(insert (substring (car symbol-list) 1))
	(subst-char-in-region start (point) ?_ ?-))
      (insert (format "\");\n  staticpro (&%s);\n" (car symbol-list)))
      (setq symbol-list (cdr symbol-list)))))

  */        

/*&&& symbols declared here &&&*/
Lisp_Object Qauto_raise;
Lisp_Object Qauto_lower;
Lisp_Object Qbackground_color;
Lisp_Object Qbar;
Lisp_Object Qborder_color;
Lisp_Object Qborder_width;
Lisp_Object Qbox;
Lisp_Object Qcursor_color;
Lisp_Object Qcursor_type;
Lisp_Object Qfont;
Lisp_Object Qforeground_color;
Lisp_Object Qgeometry;
Lisp_Object Qicon_left;
Lisp_Object Qicon_top;
Lisp_Object Qicon_type;
Lisp_Object Qinternal_border_width;
Lisp_Object Qleft;
Lisp_Object Qmouse_color;
Lisp_Object Qnone;
Lisp_Object Qparent_id;
Lisp_Object Qscroll_bar_width;
Lisp_Object Qsuppress_icon;
Lisp_Object Qtop;
Lisp_Object Qundefined_color;
Lisp_Object Qvertical_scroll_bars;
Lisp_Object Qvisibility;
Lisp_Object Qwindow_id;
Lisp_Object Qx_frame_parameter;
Lisp_Object Qx_resource_name;
Lisp_Object Quser_position;
Lisp_Object Quser_size;
Lisp_Object Qdisplay;

/* The below are defined in frame.c.  */
extern Lisp_Object Qheight, Qminibuffer, Qname, Qonly, Qwidth;
extern Lisp_Object Qunsplittable, Qmenu_bar_lines;

extern Lisp_Object Vwindow_system_version;


/* Error if we are not connected to X.  */
void
check_x ()
{
  if (! x_in_use)
    error ("X windows are not in use or not initialized");
}

/* Nonzero if using X for display.  */

int
using_x_p ()
{
  return x_in_use;
}

/* Extract a frame as a FRAME_PTR, defaulting to the selected frame
   and checking validity for X.  */

FRAME_PTR
check_x_frame (frame)
     Lisp_Object frame;
{
  FRAME_PTR f;

  if (NILP (frame))
    f = selected_frame;
  else
    {
      CHECK_LIVE_FRAME (frame, 0);
      f = XFRAME (frame);
    }
  if (! FRAME_X_P (f))
    error ("non-X frame used");
  return f;
}

/* Let the user specify an X display with a frame.
   nil stands for the selected frame--or, if that is not an X frame,
   the first X display on the list.  */

static struct x_display_info *
check_x_display_info (frame)
     Lisp_Object frame;
{
  if (NILP (frame))
    {
      if (FRAME_X_P (selected_frame))
	return FRAME_X_DISPLAY_INFO (selected_frame);
      else if (x_display_list != 0)
	return x_display_list;
      else
	error ("X windows are not in use or not initialized");
    }
  else if (STRINGP (frame))
    return x_display_info_for_name (frame);
  else
    {
      FRAME_PTR f;

      CHECK_LIVE_FRAME (frame, 0);
      f = XFRAME (frame);
      if (! FRAME_X_P (f))
	error ("non-X frame used");
      return FRAME_X_DISPLAY_INFO (f);
    }
}

/* Return the Emacs frame-object corresponding to an X window.
   It could be the frame's main window or an icon window.  */

/* This function can be called during GC, so use XGCTYPE.  */

struct frame *
x_window_to_frame (wdesc)
     int wdesc;
{
  Lisp_Object tail, frame;
  struct frame *f;

  for (tail = Vframe_list; XGCTYPE (tail) == Lisp_Cons;
       tail = XCONS (tail)->cdr)
    {
      frame = XCONS (tail)->car;
      if (XGCTYPE (frame) != Lisp_Frame)
        continue;
      f = XFRAME (frame);
#ifdef USE_X_TOOLKIT
      if (f->display.nothing == 1) 
	return 0;
      if ((f->display.x->edit_widget 
	   && XtWindow (f->display.x->edit_widget) == wdesc)
          || f->display.x->icon_desc == wdesc)
        return f;
#else /* not USE_X_TOOLKIT */
      if (FRAME_X_WINDOW (f) == wdesc
          || f->display.x->icon_desc == wdesc)
        return f;
#endif /* not USE_X_TOOLKIT */
    }
  return 0;
}

#ifdef USE_X_TOOLKIT
/* Like x_window_to_frame but also compares the window with the widget's
   windows.  */

struct frame *
x_any_window_to_frame (wdesc)
     int wdesc;
{
  Lisp_Object tail, frame;
  struct frame *f;
  struct x_display *x;

  for (tail = Vframe_list; XGCTYPE (tail) == Lisp_Cons;
       tail = XCONS (tail)->cdr)
    {
      frame = XCONS (tail)->car;
      if (XGCTYPE (frame) != Lisp_Frame)
        continue;
      f = XFRAME (frame);
      if (f->display.nothing == 1) 
	return 0;
      x = f->display.x;
      /* This frame matches if the window is any of its widgets.  */
      if (wdesc == XtWindow (x->widget) 
	  || wdesc == XtWindow (x->column_widget) 
	  || wdesc == XtWindow (x->edit_widget))
	return f;
      /* Match if the window is this frame's menubar.  */
      if (lw_window_is_in_menubar (wdesc, x->menubar_widget))
	return f;
    }
  return 0;
}

/* Return the frame whose principal (outermost) window is WDESC.
   If WDESC is some other (smaller) window, we return 0.  */

struct frame *
x_top_window_to_frame (wdesc)
     int wdesc;
{
  Lisp_Object tail, frame;
  struct frame *f;
  struct x_display *x;

  for (tail = Vframe_list; XGCTYPE (tail) == Lisp_Cons;
       tail = XCONS (tail)->cdr)
    {
      frame = XCONS (tail)->car;
      if (XGCTYPE (frame) != Lisp_Frame)
        continue;
      f = XFRAME (frame);
      if (f->display.nothing == 1) 
	return 0;
      x = f->display.x;
      /* This frame matches if the window is its topmost widget.  */
      if (wdesc == XtWindow (x->widget))
	return f;
      /* Match if the window is this frame's menubar.  */
      if (x->menubar_widget 
	  && wdesc == XtWindow (x->menubar_widget))
	return f;
    }
  return 0;
}
#endif /* USE_X_TOOLKIT */



/* Code to deal with bitmaps.  Bitmaps are referenced by their bitmap
   id, which is just an int that this section returns.  Bitmaps are
   reference counted so they can be shared among frames.

   Bitmap indices are guaranteed to be > 0, so a negative number can
   be used to indicate no bitmap.

   If you use x_create_bitmap_from_data, then you must keep track of
   the bitmaps yourself.  That is, creating a bitmap from the same
   data more than once will not be caught.  */


/* Functions to access the contents of a bitmap, given an id.  */

int
x_bitmap_height (f, id)
     FRAME_PTR f;
     int id;
{
  return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].height;
}

int
x_bitmap_width (f, id)
     FRAME_PTR f;
     int id;
{
  return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].width;
}

int
x_bitmap_pixmap (f, id)
     FRAME_PTR f;
     int id;
{
  return FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].pixmap;
}


/* Allocate a new bitmap record.  Returns index of new record.  */

static int
x_allocate_bitmap_record (f)
     FRAME_PTR f;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  int i;

  if (dpyinfo->bitmaps == NULL)
    {
      dpyinfo->bitmaps_size = 10;
      dpyinfo->bitmaps
	= (struct x_bitmap_record *) xmalloc (dpyinfo->bitmaps_size * sizeof (struct x_bitmap_record));
      dpyinfo->bitmaps_last = 1;
      return 1;
    }

  if (dpyinfo->bitmaps_last < dpyinfo->bitmaps_size)
    return ++dpyinfo->bitmaps_last;

  for (i = 0; i < dpyinfo->bitmaps_size; ++i)
    if (dpyinfo->bitmaps[i].refcount == 0)
      return i + 1;

  dpyinfo->bitmaps_size *= 2;
  dpyinfo->bitmaps
    = (struct x_bitmap_record *) xrealloc (dpyinfo->bitmaps,
					   dpyinfo->bitmaps_size * sizeof (struct x_bitmap_record));
  return ++dpyinfo->bitmaps_last;
}

/* Add one reference to the reference count of the bitmap with id ID.  */

void
x_reference_bitmap (f, id)
     FRAME_PTR f;
     int id;
{
  ++FRAME_X_DISPLAY_INFO (f)->bitmaps[id - 1].refcount;
}

/* Create a bitmap for frame F from a HEIGHT x WIDTH array of bits at BITS.  */

int
x_create_bitmap_from_data (f, bits, width, height)
     struct frame *f;
     char *bits;
     unsigned int width, height;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  Pixmap bitmap;
  int id;

  bitmap = XCreateBitmapFromData (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
				  bits, width, height);

  if (! bitmap)
    return -1;

  id = x_allocate_bitmap_record (f);
  dpyinfo->bitmaps[id - 1].pixmap = bitmap;
  dpyinfo->bitmaps[id - 1].file = NULL;
  dpyinfo->bitmaps[id - 1].refcount = 1;
  dpyinfo->bitmaps[id - 1].depth = 1;
  dpyinfo->bitmaps[id - 1].height = height;
  dpyinfo->bitmaps[id - 1].width = width;

  return id;
}

/* Create bitmap from file FILE for frame F.  */

int
x_create_bitmap_from_file (f, file)
     struct frame *f;
     Lisp_Object file;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
  unsigned int width, height;
  Pixmap bitmap;
  int xhot, yhot, result, id;
  Lisp_Object found;
  int fd;
  char *filename;

  /* Look for an existing bitmap with the same name.  */
  for (id = 0; id < dpyinfo->bitmaps_last; ++id)
    {
      if (dpyinfo->bitmaps[id].refcount
	  && dpyinfo->bitmaps[id].file
	  && !strcmp (dpyinfo->bitmaps[id].file, (char *) XSTRING (file)->data))
	{
	  ++dpyinfo->bitmaps[id].refcount;
	  return id + 1;
	}
    }

  /* Search bitmap-file-path for the file, if appropriate.  */
  fd = openp (Vx_bitmap_file_path, file, "", &found, 0);
  if (fd < 0)
    return -1;
  close (fd);

  filename = (char *) XSTRING (found)->data;

  result = XReadBitmapFile (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
			    filename, &width, &height, &bitmap, &xhot, &yhot);
  if (result != BitmapSuccess)
    return -1;

  id = x_allocate_bitmap_record (f);
  dpyinfo->bitmaps[id - 1].pixmap = bitmap;
  dpyinfo->bitmaps[id - 1].refcount = 1;
  dpyinfo->bitmaps[id - 1].file = (char *) xmalloc (XSTRING (file)->size + 1);
  dpyinfo->bitmaps[id - 1].depth = 1;
  dpyinfo->bitmaps[id - 1].height = height;
  dpyinfo->bitmaps[id - 1].width = width;
  strcpy (dpyinfo->bitmaps[id - 1].file, XSTRING (file)->data);

  return id;
}

/* Remove reference to bitmap with id number ID.  */

int
x_destroy_bitmap (f, id)
     FRAME_PTR f;
     int id;
{
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);

  if (id > 0)
    {
      --dpyinfo->bitmaps[id - 1].refcount;
      if (dpyinfo->bitmaps[id - 1].refcount == 0)
	{
	  XFreePixmap (FRAME_X_DISPLAY (f), dpyinfo->bitmaps[id - 1].pixmap);
	  if (dpyinfo->bitmaps[id - 1].file)
	    {
	      free (dpyinfo->bitmaps[id - 1].file);
	      dpyinfo->bitmaps[id - 1].file = NULL;
	    }
	}
    }
}

/* Free all the bitmaps for the display specified by DPYINFO.  */

static void
x_destroy_all_bitmaps (dpyinfo)
     struct x_display_info *dpyinfo;
{
  int i;
  for (i = 0; i < dpyinfo->bitmaps_last; i++)
    if (dpyinfo->bitmaps[i].refcount > 0)
      {
	XFreePixmap (dpyinfo->display, dpyinfo->bitmaps[i].pixmap);
	if (dpyinfo->bitmaps[i].file)
	  free (dpyinfo->bitmaps[i].file);
      }
  dpyinfo->bitmaps_last = 0;
}

/* Connect the frame-parameter names for X frames
   to the ways of passing the parameter values to the window system.

   The name of a parameter, as a Lisp symbol,
   has an `x-frame-parameter' property which is an integer in Lisp
   but can be interpreted as an `enum x_frame_parm' in C.  */

enum x_frame_parm
{
  X_PARM_FOREGROUND_COLOR,
  X_PARM_BACKGROUND_COLOR,
  X_PARM_MOUSE_COLOR,
  X_PARM_CURSOR_COLOR,
  X_PARM_BORDER_COLOR,
  X_PARM_ICON_TYPE,
  X_PARM_FONT,
  X_PARM_BORDER_WIDTH,
  X_PARM_INTERNAL_BORDER_WIDTH,
  X_PARM_NAME,
  X_PARM_AUTORAISE,
  X_PARM_AUTOLOWER,
  X_PARM_VERT_SCROLL_BAR,
  X_PARM_VISIBILITY,
  X_PARM_MENU_BAR_LINES
};


struct x_frame_parm_table
{
  char *name;
  void (*setter)( /* struct frame *frame, Lisp_Object val, oldval */ );
};

void x_set_foreground_color ();
void x_set_background_color ();
void x_set_mouse_color ();
void x_set_cursor_color ();
void x_set_border_color ();
void x_set_cursor_type ();
void x_set_icon_type ();
void x_set_font ();
void x_set_border_width ();
void x_set_internal_border_width ();
void x_explicitly_set_name ();
void x_set_autoraise ();
void x_set_autolower ();
void x_set_vertical_scroll_bars ();
void x_set_visibility ();
void x_set_menu_bar_lines ();
void x_set_scroll_bar_width ();
void x_set_unsplittable ();

static struct x_frame_parm_table x_frame_parms[] =
{
  "foreground-color", x_set_foreground_color,
  "background-color", x_set_background_color,
  "mouse-color", x_set_mouse_color,
  "cursor-color", x_set_cursor_color,
  "border-color", x_set_border_color,
  "cursor-type", x_set_cursor_type,
  "icon-type", x_set_icon_type,
  "font", x_set_font,
  "border-width", x_set_border_width,
  "internal-border-width", x_set_internal_border_width,
  "name", x_explicitly_set_name,
  "auto-raise", x_set_autoraise,
  "auto-lower", x_set_autolower,
  "vertical-scroll-bars", x_set_vertical_scroll_bars,
  "visibility", x_set_visibility,
  "menu-bar-lines", x_set_menu_bar_lines,
  "scroll-bar-width", x_set_scroll_bar_width,
  "unsplittable", x_set_unsplittable,
};

/* Attach the `x-frame-parameter' properties to
   the Lisp symbol names of parameters relevant to X.  */

init_x_parm_symbols ()
{
  int i;

  for (i = 0; i < sizeof (x_frame_parms) / sizeof (x_frame_parms[0]); i++)
    Fput (intern (x_frame_parms[i].name), Qx_frame_parameter,
	  make_number (i));
}

/* Change the parameters of FRAME as specified by ALIST.
   If a parameter is not specially recognized, do nothing;
   otherwise call the `x_set_...' function for that parameter.  */

void
x_set_frame_parameters (f, alist)
     FRAME_PTR f;
     Lisp_Object alist;
{
  Lisp_Object tail;

  /* If both of these parameters are present, it's more efficient to
     set them both at once.  So we wait until we've looked at the
     entire list before we set them.  */
  Lisp_Object width, height;

  /* Same here.  */
  Lisp_Object left, top;

  /* Record in these vectors all the parms specified.  */
  Lisp_Object *parms;
  Lisp_Object *values;
  int i;
  int left_no_change = 0, top_no_change = 0;

  i = 0;
  for (tail = alist; CONSP (tail); tail = Fcdr (tail))
    i++;

  parms = (Lisp_Object *) alloca (i * sizeof (Lisp_Object));
  values = (Lisp_Object *) alloca (i * sizeof (Lisp_Object));

  /* Extract parm names and values into those vectors.  */

  i = 0;
  for (tail = alist; CONSP (tail); tail = Fcdr (tail))
    {
      Lisp_Object elt, prop, val;

      elt = Fcar (tail);
      parms[i] = Fcar (elt);
      values[i] = Fcdr (elt);
      i++;
    }

  width = height = top = left = Qunbound;

  /* Now process them in reverse of specified order.  */
  for (i--; i >= 0; i--)
    {
      Lisp_Object prop, val;

      prop = parms[i];
      val = values[i];

      if (EQ (prop, Qwidth))
	width = val;
      else if (EQ (prop, Qheight))
	height = val;
      else if (EQ (prop, Qtop))
	top = val;
      else if (EQ (prop, Qleft))
	left = val;
      else
	{
	  register Lisp_Object param_index, old_value;

	  param_index = Fget (prop, Qx_frame_parameter);
	  old_value = get_frame_param (f, prop);
	  store_frame_param (f, prop, val);
 	  if (INTEGERP (param_index)
	      && XINT (param_index) >= 0
	      && (XINT (param_index)
		  < sizeof (x_frame_parms)/sizeof (x_frame_parms[0])))
	    (*x_frame_parms[XINT (param_index)].setter)(f, val, old_value);
	}
    }

  /* Don't die if just one of these was set.  */
  if (EQ (left, Qunbound))
    {
      left_no_change = 1;
      if (f->display.x->left_pos < 0)
	left = Fcons (Qplus, Fcons (make_number (f->display.x->left_pos), Qnil));
      else
	XSETINT (left, f->display.x->left_pos);
    }
  if (EQ (top, Qunbound))
    {
      top_no_change = 1;
      if (f->display.x->top_pos < 0)
	top = Fcons (Qplus, Fcons (make_number (f->display.x->top_pos), Qnil));
      else
	XSETINT (top, f->display.x->top_pos);
    }

  /* Don't die if just one of these was set.  */
  if (EQ (width, Qunbound))
    XSETINT (width, FRAME_WIDTH (f));
  if (EQ (height, Qunbound))
    XSETINT (height, FRAME_HEIGHT (f));

  /* Don't set these parameters these unless they've been explicitly
     specified.  The window might be mapped or resized while we're in
     this function, and we don't want to override that unless the lisp
     code has asked for it.

     Don't set these parameters unless they actually differ from the
     window's current parameters; the window may not actually exist
     yet.  */
  {
    Lisp_Object frame;

    check_frame_size (f, &height, &width);

    XSETFRAME (frame, f);

    if ((NUMBERP (width) && XINT (width) != FRAME_WIDTH (f))
	|| (NUMBERP (height) && XINT (height) != FRAME_HEIGHT (f)))
      Fset_frame_size (frame, width, height);

    if ((!NILP (left) || !NILP (top))
	&& ! (left_no_change && top_no_change)
	&& ! (NUMBERP (left) && XINT (left) == f->display.x->left_pos
	      && NUMBERP (top) && XINT (top) == f->display.x->top_pos))
      {
	int leftpos = 0;
	int toppos = 0;

	/* Record the signs.  */
	f->display.x->size_hint_flags &= ~ (XNegative | YNegative);
	if (EQ (left, Qminus))
	  f->display.x->size_hint_flags |= XNegative;
	else if (INTEGERP (left))
	  {
	    leftpos = XINT (left);
	    if (leftpos < 0)
	      f->display.x->size_hint_flags |= XNegative;
	  }
	else if (CONSP (left) && EQ (XCONS (left)->car, Qminus)
		 && CONSP (XCONS (left)->cdr)
		 && INTEGERP (XCONS (XCONS (left)->cdr)->car))
	  {
	    leftpos = - XINT (XCONS (XCONS (left)->cdr)->car);
	    f->display.x->size_hint_flags |= XNegative;
	  }
	else if (CONSP (left) && EQ (XCONS (left)->car, Qplus)
		 && CONSP (XCONS (left)->cdr)
		 && INTEGERP (XCONS (XCONS (left)->cdr)->car))
	  {
	    leftpos = XINT (XCONS (XCONS (left)->cdr)->car);
	  }

	if (EQ (top, Qminus))
	  f->display.x->size_hint_flags |= YNegative;
	else if (INTEGERP (top))
	  {
	    toppos = XINT (top);
	    if (toppos < 0)
	      f->display.x->size_hint_flags |= YNegative;
	  }
	else if (CONSP (top) && EQ (XCONS (top)->car, Qminus)
		 && CONSP (XCONS (top)->cdr)
		 && INTEGERP (XCONS (XCONS (top)->cdr)->car))
	  {
	    toppos = - XINT (XCONS (XCONS (top)->cdr)->car);
	    f->display.x->size_hint_flags |= YNegative;
	  }
	else if (CONSP (top) && EQ (XCONS (top)->car, Qplus)
		 && CONSP (XCONS (top)->cdr)
		 && INTEGERP (XCONS (XCONS (top)->cdr)->car))
	  {
	    toppos = XINT (XCONS (XCONS (top)->cdr)->car);
	  }


	/* Store the numeric value of the position.  */
	f->display.x->top_pos = toppos;
	f->display.x->left_pos = leftpos;

	f->display.x->win_gravity = NorthWestGravity;

	/* Actually set that position, and convert to absolute.  */
	x_set_offset (f, leftpos, toppos, 0);
      }
  }
}

/* Store the screen positions of frame F into XPTR and YPTR.
   These are the positions of the containing window manager window,
   not Emacs's own window.  */

void
x_real_positions (f, xptr, yptr)
     FRAME_PTR f;
     int *xptr, *yptr;
{
  int win_x, win_y;
  Window child;

  /* This is pretty gross, but seems to be the easiest way out of
     the problem that arises when restarting window-managers.  */

#ifdef USE_X_TOOLKIT
  Window outer = XtWindow (f->display.x->widget);
#else
  Window outer = f->display.x->window_desc;
#endif
  Window tmp_root_window;
  Window *tmp_children;
  int tmp_nchildren;

  x_catch_errors (FRAME_X_DISPLAY (f));
  while (1)
    {
      XQueryTree (FRAME_X_DISPLAY (f), outer, &tmp_root_window,
		  &f->display.x->parent_desc,
		  &tmp_children, &tmp_nchildren);
      xfree (tmp_children);

      win_x = win_y = 0;

      /* Find the position of the outside upper-left corner of
	 the inner window, with respect to the outer window.  */
      if (f->display.x->parent_desc != FRAME_X_DISPLAY_INFO (f)->root_window)
	{
	  XTranslateCoordinates (FRAME_X_DISPLAY (f),

				 /* From-window, to-window.  */
#ifdef USE_X_TOOLKIT
				 XtWindow (f->display.x->widget),
#else
				 f->display.x->window_desc,
#endif
				 f->display.x->parent_desc,

				 /* From-position, to-position.  */
				 0, 0, &win_x, &win_y,

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

	  win_x += f->display.x->border_width;
	  win_y += f->display.x->border_width;
	}

      /* It is possible for the window returned by the XQueryNotify
	 to become invalid by the time we call XTranslateCoordinates.
	 That can happen when you restart some window managers.
	 If so, we get an error in XTranslateCoordinates.
	 Detect that and try the whole thing over.  */
      if (! x_had_errors_p (FRAME_X_DISPLAY (f)))
	break;
    }

  x_uncatch_errors (FRAME_X_DISPLAY (f));

  *xptr = f->display.x->left_pos - win_x;
  *yptr = f->display.x->top_pos - win_y;
}

/* Insert a description of internally-recorded parameters of frame X
   into the parameter alist *ALISTPTR that is to be given to the user.
   Only parameters that are specific to the X window system
   and whose values are not correctly recorded in the frame's
   param_alist need to be considered here.  */

x_report_frame_params (f, alistptr)
     struct frame *f;
     Lisp_Object *alistptr;
{
  char buf[16];

  store_in_alist (alistptr, Qleft, make_number (f->display.x->left_pos));
  store_in_alist (alistptr, Qtop, make_number (f->display.x->top_pos));
  store_in_alist (alistptr, Qborder_width,
       	   make_number (f->display.x->border_width));
  store_in_alist (alistptr, Qinternal_border_width,
       	   make_number (f->display.x->internal_border_width));
  sprintf (buf, "%ld", (long) FRAME_X_WINDOW (f));
  store_in_alist (alistptr, Qwindow_id,
       	   build_string (buf));
  FRAME_SAMPLE_VISIBILITY (f);
  store_in_alist (alistptr, Qvisibility,
		  (FRAME_VISIBLE_P (f) ? Qt
		   : FRAME_ICONIFIED_P (f) ? Qicon : Qnil));
}

/* Decide if color named COLOR is valid for the display associated with
   the selected frame; if so, return the rgb values in COLOR_DEF.
   If ALLOC is nonzero, allocate a new colormap cell.  */

int
defined_color (f, color, color_def, alloc)
     FRAME_PTR f;
     char *color;
     XColor *color_def;
     int alloc;
{
  register int foo;
  Colormap screen_colormap;

  BLOCK_INPUT;
  screen_colormap
    = DefaultColormap (FRAME_X_DISPLAY (f),
		       XDefaultScreen (FRAME_X_DISPLAY (f)));

  foo = XParseColor (FRAME_X_DISPLAY (f), screen_colormap, color, color_def);
  if (foo && alloc)
    foo = XAllocColor (FRAME_X_DISPLAY (f), screen_colormap, color_def);
  UNBLOCK_INPUT;

  if (foo)
    return 1;
  else
    return 0;
}

/* Given a string ARG naming a color, compute a pixel value from it
   suitable for screen F.
   If F is not a color screen, return DEF (default) regardless of what
   ARG says.  */

int
x_decode_color (f, arg, def)
     FRAME_PTR f;
     Lisp_Object arg;
     int def;
{
  XColor cdef;

  CHECK_STRING (arg, 0);

  if (strcmp (XSTRING (arg)->data, "black") == 0)
    return BLACK_PIX_DEFAULT (f);
  else if (strcmp (XSTRING (arg)->data, "white") == 0)
    return WHITE_PIX_DEFAULT (f);

  if (FRAME_X_DISPLAY_INFO (f)->n_planes == 1)
    return def;

  if (defined_color (f, XSTRING (arg)->data, &cdef, 1))
    return cdef.pixel;
  else
    Fsignal (Qundefined_color, Fcons (arg, Qnil));
}

/* Functions called only from `x_set_frame_param'
   to set individual parameters.

   If FRAME_X_WINDOW (f) is 0,
   the frame is being created and its X-window does not exist yet.
   In that case, just record the parameter's new value
   in the standard place; do not attempt to change the window.  */

void
x_set_foreground_color (f, arg, oldval)
     struct frame *f;
     Lisp_Object arg, oldval;
{
  f->display.x->foreground_pixel
    = x_decode_color (f, arg, BLACK_PIX_DEFAULT (f));
  if (FRAME_X_WINDOW (f) != 0)
    {
      BLOCK_INPUT;
      XSetForeground (FRAME_X_DISPLAY (f), f->display.x->normal_gc,
		      f->display.x->foreground_pixel);
      XSetBackground (FRAME_X_DISPLAY (f), f->display.x->reverse_gc,
		      f->display.x->foreground_pixel);