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/* Generic frame functions.
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Copyright (C) 1993-1995, 1997, 1999-2020 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
#include <limits.h>
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#include <c-ctype.h>

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#include "lisp.h"
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#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

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#include "buffer.h"
/* These help us bind and responding to switch-frame events.  */
#include "keyboard.h"
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#include "ptr-bounds.h"
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#include "frame.h"
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#include "blockinput.h"
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#include "termchar.h"
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#include "termhooks.h"
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#include "dispextern.h"
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#include "window.h"
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#ifdef HAVE_WINDOW_SYSTEM
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#include "fontset.h"
#endif
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#include "cm.h"
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#ifdef MSDOS
#include "msdos.h"
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#include "dosfns.h"
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#endif
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#ifdef USE_X_TOOLKIT
#include "widget.h"
#endif
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#include "pdumper.h"
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/* The currently selected frame.  */
Lisp_Object selected_frame;

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/* The selected frame the last time window change functions were run.  */
Lisp_Object old_selected_frame;

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/* A frame which is not just a mini-buffer, or NULL if there are no such
   frames.  This is usually the most recent such frame that was selected.  */

static struct frame *last_nonminibuf_frame;

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/* False means there are no visible garbaged frames.  */
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bool frame_garbaged;

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/* The default tab bar height for future frames.  */
int frame_default_tab_bar_height;

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/* The default tool bar height for future frames.  */
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#ifdef HAVE_EXT_TOOL_BAR
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enum { frame_default_tool_bar_height = 0 };
#else
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int frame_default_tool_bar_height;
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#endif
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#ifdef HAVE_WINDOW_SYSTEM
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static void gui_report_frame_params (struct frame *, Lisp_Object *);
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#endif

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/* These setters are used only in this file, so they can be private.  */
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static void
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fset_buffer_predicate (struct frame *f, Lisp_Object val)
{
  f->buffer_predicate = val;
}
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static void
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fset_minibuffer_window (struct frame *f, Lisp_Object val)
{
  f->minibuffer_window = val;
}

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struct frame *
decode_live_frame (register Lisp_Object frame)
{
  if (NILP (frame))
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame);
  return XFRAME (frame);
}

struct frame *
decode_any_frame (register Lisp_Object frame)
{
  if (NILP (frame))
    frame = selected_frame;
  CHECK_FRAME (frame);
  return XFRAME (frame);
}

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#ifdef HAVE_WINDOW_SYSTEM
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bool
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display_available (void)
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{
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  return x_display_list != NULL;
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}
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#endif
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struct frame *
decode_window_system_frame (Lisp_Object frame)
{
  struct frame *f = decode_live_frame (frame);
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  check_window_system (f);
#ifdef HAVE_WINDOW_SYSTEM
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  return f;
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#endif
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}

void
check_window_system (struct frame *f)
{
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#ifdef HAVE_WINDOW_SYSTEM
  if (window_system_available (f))
    return;
#endif
  error (f ? "Window system frame should be used"
	 : "Window system is not in use or not initialized");
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}

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/* Return the value of frame parameter PROP in frame FRAME.  */
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Lisp_Object
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get_frame_param (struct frame *frame, Lisp_Object prop)
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{
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  return Fcdr (Fassq (prop, frame->param_alist));
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}

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void
frame_size_history_add (struct frame *f, Lisp_Object fun_symbol,
			int width, int height, Lisp_Object rest)
{
  Lisp_Object frame;

  XSETFRAME (frame, f);
  if (CONSP (frame_size_history)
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      && FIXNUMP (XCAR (frame_size_history))
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      && 0 < XFIXNUM (XCAR (frame_size_history)))
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    frame_size_history =
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      Fcons (make_fixnum (XFIXNUM (XCAR (frame_size_history)) - 1),
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	     Fcons (list4
		    (frame, fun_symbol,
		     ((width > 0)
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		      ? list4i (FRAME_TEXT_WIDTH (f), FRAME_TEXT_HEIGHT (f),
				width, height)
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		      : Qnil),
		     rest),
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		    XCDR (frame_size_history)));
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}


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/* Return 1 if `frame-inhibit-implied-resize' is non-nil or fullscreen
   state of frame F would be affected by a vertical (horizontal if
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   HORIZONTAL is true) resize.  PARAMETER is the symbol of the frame
   parameter that is changed.  */
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bool
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frame_inhibit_resize (struct frame *f, bool horizontal, Lisp_Object parameter)
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{
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  Lisp_Object fullscreen = get_frame_param (f, Qfullscreen);
  bool inhibit
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    = (f->after_make_frame
       ? (EQ (frame_inhibit_implied_resize, Qt)
	  || (CONSP (frame_inhibit_implied_resize)
	      && !NILP (Fmemq (parameter, frame_inhibit_implied_resize)))
	  || (horizontal
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	      && !NILP (fullscreen) && !EQ (fullscreen, Qfullheight))
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	  || (!horizontal
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	      && !NILP (fullscreen) && !EQ (fullscreen, Qfullwidth))
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	  || FRAME_TERMCAP_P (f) || FRAME_MSDOS_P (f))
       : ((horizontal && f->inhibit_horizontal_resize)
	  || (!horizontal && f->inhibit_vertical_resize)));
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  if (inhibit && !FRAME_TERMCAP_P (f) && !FRAME_MSDOS_P (f))
    frame_size_history_add
      (f, Qframe_inhibit_resize, 0, 0,
       list5 (horizontal ? Qt : Qnil, parameter,
	      f->after_make_frame ? Qt : Qnil,
	      frame_inhibit_implied_resize,
	      fullscreen));

  return inhibit;
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}

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static void
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set_menu_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
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{
  int nlines;
  int olines = FRAME_MENU_BAR_LINES (f);

  /* Right now, menu bars don't work properly in minibuf-only frames;
     most of the commands try to apply themselves to the minibuffer
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     frame itself, and get an error because you can't switch buffers
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     in or split the minibuffer window.  */
  if (FRAME_MINIBUF_ONLY_P (f))
    return;

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  if (TYPE_RANGED_FIXNUMP (int, value))
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    nlines = XFIXNUM (value);
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  else
    nlines = 0;

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  if (nlines != olines)
    {
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      windows_or_buffers_changed = 14;
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      FRAME_MENU_BAR_LINES (f) = nlines;
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      FRAME_MENU_BAR_HEIGHT (f) = nlines * FRAME_LINE_HEIGHT (f);
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      change_frame_size (f, FRAME_COLS (f),
			 FRAME_LINES (f) + olines - nlines,
			 0, 1, 0, 0);
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    }
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}
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static void
set_tab_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
{
  int nlines;
  int olines = FRAME_TAB_BAR_LINES (f);

  /* Right now, tab bars don't work properly in minibuf-only frames;
     most of the commands try to apply themselves to the minibuffer
     frame itself, and get an error because you can't switch buffers
     in or split the minibuffer window.  */
  if (FRAME_MINIBUF_ONLY_P (f))
    return;

  if (TYPE_RANGED_FIXNUMP (int, value))
    nlines = XFIXNUM (value);
  else
    nlines = 0;

  if (nlines != olines)
    {
      windows_or_buffers_changed = 14;
      FRAME_TAB_BAR_LINES (f) = nlines;
      FRAME_TAB_BAR_HEIGHT (f) = nlines * FRAME_LINE_HEIGHT (f);
      change_frame_size (f, FRAME_COLS (f),
			 FRAME_LINES (f) + olines - nlines,
			 0, 1, 0, 0);
    }
}
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Lisp_Object Vframe_list;

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DEFUN ("framep", Fframep, Sframep, 1, 1, 0,
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       doc: /* Return non-nil if OBJECT is a frame.
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Value is:
  t for a termcap frame (a character-only terminal),
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 `x' for an Emacs frame that is really an X window,
 `w32' for an Emacs frame that is a window on MS-Windows display,
 `ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
 `pc' for a direct-write MS-DOS frame.
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See also `frame-live-p'.  */)
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  (Lisp_Object object)
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{
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  if (!FRAMEP (object))
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    return Qnil;
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  switch (XFRAME (object)->output_method)
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    {
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    case output_initial: /* The initial frame is like a termcap frame. */
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    case output_termcap:
      return Qt;
    case output_x_window:
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      return Qx;
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    case output_w32:
      return Qw32;
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    case output_msdos_raw:
      return Qpc;
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    case output_ns:
      return Qns;
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    default:
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      emacs_abort ();
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    }
}

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DEFUN ("frame-live-p", Fframe_live_p, Sframe_live_p, 1, 1, 0,
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       doc: /* Return non-nil if OBJECT is a frame which has not been deleted.
Value is nil if OBJECT is not a live frame.  If object is a live
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frame, the return value indicates what sort of terminal device it is
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displayed on.  See the documentation of `framep' for possible
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return values.  */)
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  (Lisp_Object object)
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{
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  return ((FRAMEP (object)
	   && FRAME_LIVE_P (XFRAME (object)))
	  ? Fframep (object)
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	  : Qnil);
}

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DEFUN ("window-system", Fwindow_system, Swindow_system, 0, 1, 0,
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       doc: /* The name of the window system that FRAME is displaying through.
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The value is a symbol:
 nil for a termcap frame (a character-only terminal),
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 `x' for an Emacs frame that is really an X window,
 `w32' for an Emacs frame that is a window on MS-Windows display,
 `ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
 `pc' for a direct-write MS-DOS frame.
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FRAME defaults to the currently selected frame.

Use of this function as a predicate is deprecated.  Instead,
use `display-graphic-p' or any of the other `display-*-p'
predicates which report frame's specific UI-related capabilities.  */)
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  (Lisp_Object frame)
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{
  Lisp_Object type;
  if (NILP (frame))
    frame = selected_frame;

  type = Fframep (frame);

  if (NILP (type))
    wrong_type_argument (Qframep, frame);

  if (EQ (type, Qt))
    return Qnil;
  else
    return type;
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}
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/* Placeholder used by temacs -nw before window.el is loaded.  */
DEFUN ("frame-windows-min-size", Fframe_windows_min_size,
       Sframe_windows_min_size, 4, 4, 0,
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       doc: /* SKIP: real doc in window.el.  */
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       attributes: const)
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     (Lisp_Object frame, Lisp_Object horizontal,
      Lisp_Object ignore, Lisp_Object pixelwise)
{
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  return make_fixnum (0);
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}

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/**
 * frame_windows_min_size:
 *
 * Return the minimum number of lines (columns if HORIZONTAL is non-nil)
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 * of FRAME.  If PIXELWISE is non-nil, return the minimum inner height
 * (width) of FRAME in pixels.
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 *
 * This value is calculated by the function `frame-windows-min-size' in
 * window.el unless the `min-height' (`min-width' if HORIZONTAL is
 * non-nil) parameter of FRAME is non-nil thus explicitly specifying the
 * value to be returned.  In that latter case IGNORE is ignored.
 *
 * If `frame-windows-min-size' is called, it will make sure that the
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 * return value accommodates all windows of FRAME respecting the values
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 * of `window-min-height' (`window-min-width' if HORIZONTAL is non-nil).
 * With IGNORE non-nil the values of these variables are ignored.
 *
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 * In either case, never return a value less than 1.  For TTY frames,
 * additionally limit the minimum frame height to a value large enough
 * to support the menu bar, the mode line, and the echo area.
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 */
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static int
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frame_windows_min_size (Lisp_Object frame, Lisp_Object horizontal,
			Lisp_Object ignore, Lisp_Object pixelwise)
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{
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  struct frame *f = XFRAME (frame);
  Lisp_Object par_size;
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  int retval;
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  if ((!NILP (horizontal)
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       && RANGED_FIXNUMP (INT_MIN,
			  par_size = get_frame_param (f, Qmin_width),
			  INT_MAX))
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      || (NILP (horizontal)
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	  && RANGED_FIXNUMP (INT_MIN,
			     par_size = get_frame_param (f, Qmin_height),
			     INT_MAX)))
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    {
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      int min_size = XFIXNUM (par_size);
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      /* Don't allow phantom frames.  */
      if (min_size < 1)
	min_size = 1;

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      retval = (NILP (pixelwise)
		? min_size
		: min_size * (NILP (horizontal)
			      ? FRAME_LINE_HEIGHT (f)
			      : FRAME_COLUMN_WIDTH (f)));
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    }
  else
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    retval = XFIXNUM (call4 (Qframe_windows_min_size, frame, horizontal,
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			  ignore, pixelwise));
  /* Don't allow too small height of text-mode frames, or else cm.c
     might abort in cmcheckmagic.  */
  if ((FRAME_TERMCAP_P (f) || FRAME_MSDOS_P (f)) && NILP (horizontal))
    {
      int min_height = (FRAME_MENU_BAR_LINES (f)
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			+ FRAME_TAB_BAR_LINES (f)
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			+ FRAME_WANTS_MODELINE_P (f)
			+ 2);	/* one text line and one echo-area line */
      if (retval < min_height)
	retval = min_height;
    }

  return retval;
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}


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#ifdef HAVE_WINDOW_SYSTEM
/**
 * keep_ratio:
 *
 * Preserve ratios of frame F which usually happens after its parent
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 * frame P got resized.  OLD_WIDTH, OLD_HEIGHT specifies the old native
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 * size of F's parent, NEW_WIDTH and NEW_HEIGHT its new size.
 *
 * Adjust F's width if F's 'keep_ratio' parameter is non-nil and, if
 * it is a cons, its car is not 'height-only'.  Adjust F's height if F's
 * 'keep_ratio' parameter is non-nil and, if it is a cons, its car
 * is not 'width-only'.
 *
 * Adjust F's left position if F's 'keep_ratio' parameter is non-nil
 * and, if its is a cons, its cdr is non-nil and not 'top-only'.  Adjust
 * F's top position if F's 'keep_ratio' parameter is non-nil and, if
 * its is a cons, its cdr is non-nil and not 'left-only'.
 *
 * Note that when positional adjustment is requested but the size of F
 * should remain unaltered in the corresponding direction, this routine
 * tries to constrain F to its parent frame - something which usually
 * happens when the parent frame shrinks.  This means, however, that
 * when the parent frame is re-enlarged later, the child's original
 * position will not get restored to its pre-shrinking value.
 *
 * This routine is currently useful for child frames only.  It might be
 * eventually useful when moving non-child frames between monitors with
 * different resolutions.
 */
static void
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keep_ratio (struct frame *f, struct frame *p, int old_width, int old_height,
	    int new_width, int new_height)
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{
  Lisp_Object keep_ratio = get_frame_param (f, Qkeep_ratio);
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  if (!NILP (keep_ratio))
    {
      double width_factor = (double)new_width / (double)old_width;
      double height_factor = (double)new_height / (double)old_height;
      int pixel_width, pixel_height, pos_x, pos_y;
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      if (!CONSP (keep_ratio) || !NILP (Fcdr (keep_ratio)))
	{
	  if (CONSP (keep_ratio) && EQ (Fcdr (keep_ratio), Qtop_only))
	    pos_x = f->left_pos;
	  else
	    {
	      pos_x = (int)(f->left_pos * width_factor + 0.5);
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	      if (CONSP (keep_ratio)
		  && (NILP (Fcar (keep_ratio))
		      || EQ (Fcar (keep_ratio), Qheight_only))
		  && p->pixel_width - f->pixel_width < pos_x)
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		{
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		  int p_f_width = p->pixel_width - f->pixel_width;
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		  if (p_f_width <= 0)
		    pos_x = 0;
		  else
		    pos_x = (int)(p_f_width * width_factor * 0.5 + 0.5);
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		}

	      f->left_pos = pos_x;
	    }

	  if (CONSP (keep_ratio) && EQ (Fcdr (keep_ratio), Qleft_only))
	    pos_y = f->top_pos;
	  else
	    {
	      pos_y = (int)(f->top_pos * height_factor + 0.5);

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	      if (CONSP (keep_ratio)
		  && (NILP (Fcar (keep_ratio))
		      || EQ (Fcar (keep_ratio), Qwidth_only))
		  && p->pixel_height - f->pixel_height < pos_y)
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		/* When positional adjustment was requested and the
		   width of F should remain unaltered, try to constrain
		   F to its parent.  This means that when the parent
		   frame is enlarged later the child's original position
		   won't get restored.  */
		{
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		  int p_f_height = p->pixel_height - f->pixel_height;
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		  if (p_f_height <= 0)
		    pos_y = 0;
		  else
		    pos_y = (int)(p_f_height * height_factor * 0.5 + 0.5);
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		}
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	      f->top_pos = pos_y;
	    }
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          if (FRAME_TERMINAL (f)->set_frame_offset_hook)
            FRAME_TERMINAL (f)->set_frame_offset_hook (f, pos_x, pos_y, -1);
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	}
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      if (!CONSP (keep_ratio) || !NILP (Fcar (keep_ratio)))
	{
	  if (CONSP (keep_ratio) && EQ (Fcar (keep_ratio), Qheight_only))
	    pixel_width = -1;
	  else
	    {
	      pixel_width = (int)(f->pixel_width * width_factor + 0.5);
	      pixel_width = FRAME_PIXEL_TO_TEXT_WIDTH (f, pixel_width);
	    }

	  if (CONSP (keep_ratio) && EQ (Fcar (keep_ratio), Qwidth_only))
	    pixel_height = -1;
	  else
	    {
	      pixel_height = (int)(f->pixel_height * height_factor + 0.5);
	      pixel_height = FRAME_PIXEL_TO_TEXT_HEIGHT (f, pixel_height);
	    }

	  adjust_frame_size (f, pixel_width, pixel_height, 1, 0,
			     Qkeep_ratio);
	}
    }
}
#endif


/**
 * adjust_frame_size:
 *
 * Adjust size of frame F.  NEW_WIDTH and NEW_HEIGHT specify the new
 * text size of F in pixels.  A value of -1 means no change is requested
 * for that direction (but the frame may still have to be resized to
 * accommodate windows with their minimum sizes).  This can either issue
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 * a request to resize the frame externally (via set_window_size_hook), to
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 * resize the frame internally (via resize_frame_windows) or do nothing
 * at all.
 *
 * The argument INHIBIT can assume the following values:
 *
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 * 0 means to unconditionally call set_window_size_hook even if sizes
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 *   apparently do not change.  Fx_create_frame uses this to pass the
 *   initial size to the window manager.
 *
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 * 1 means to call set_window_size_hook if the native frame size really
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 *   changes.  Fset_frame_size, Fset_frame_height, ... use this.
 *
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 * 2 means to call set_window_size_hook provided frame_inhibit_resize
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 *   allows it.  The menu and tool bar code use this ("3" won't work
 *   here in general because menu and tool bar are often not counted in
 *   the frame's text height).
 *
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 * 3 means call set_window_size_hook if window minimum sizes must be
 *   preserved or frame_inhibit_resize allows it.
 *   gui_set_left_fringe, gui_set_scroll_bar_width, gui_new_font
 *   ... use (or should use) this.
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 *
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 * 4 means call set_window_size_hook only if window minimum sizes must
 *   be preserved.  x_set_right_divider_width, x_set_border_width and
 *   the code responsible for wrapping the tool bar use this.
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 *
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 * 5 means to never call set_window_size_hook.  change_frame_size uses
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 *   this.
 *
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 * Note that even when set_window_size_hook is not called, individual
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 * windows may have to be resized (via `window--sanitize-window-sizes')
 * in order to support minimum size constraints.
 *
 * PRETEND is as for change_frame_size.  PARAMETER, if non-nil, is the
 * symbol of the parameter changed (like `menu-bar-lines', `font', ...).
 * This is passed on to frame_inhibit_resize to let the latter decide on
 * a case-by-case basis whether the frame may be resized externally.
 */
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void
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adjust_frame_size (struct frame *f, int new_width, int new_height, int inhibit,
		   bool pretend, Lisp_Object parameter)
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{
  int unit_width = FRAME_COLUMN_WIDTH (f);
  int unit_height = FRAME_LINE_HEIGHT (f);
  int old_pixel_width = FRAME_PIXEL_WIDTH (f);
  int old_pixel_height = FRAME_PIXEL_HEIGHT (f);
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  int old_cols = FRAME_COLS (f);
  int old_lines = FRAME_LINES (f);
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  int new_pixel_width, new_pixel_height;
  /* The following two values are calculated from the old frame pixel
     sizes and any "new" settings for tool bar, menu bar and internal
     borders.  We do it this way to detect whether we have to call
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     set_window_size_hook as consequence of the new settings.  */
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  int windows_width = FRAME_WINDOWS_WIDTH (f);
  int windows_height = FRAME_WINDOWS_HEIGHT (f);
  int min_windows_width, min_windows_height;
  /* These are a bit tedious, maybe we should use a macro.  */
  struct window *r = XWINDOW (FRAME_ROOT_WINDOW (f));
  int old_windows_width = WINDOW_PIXEL_WIDTH (r);
  int old_windows_height
    = (WINDOW_PIXEL_HEIGHT (r)
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       + ((FRAME_HAS_MINIBUF_P (f) && !FRAME_MINIBUF_ONLY_P (f))
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	  ? WINDOW_PIXEL_HEIGHT (XWINDOW (FRAME_MINIBUF_WINDOW (f)))
	  : 0));
  int new_windows_width, new_windows_height;
  int old_text_width = FRAME_TEXT_WIDTH (f);
  int old_text_height = FRAME_TEXT_HEIGHT (f);
  /* If a size is < 0 use the old value.  */
  int new_text_width = (new_width >= 0) ? new_width : old_text_width;
  int new_text_height = (new_height >= 0) ? new_height : old_text_height;
  int new_cols, new_lines;
  bool inhibit_horizontal, inhibit_vertical;
  Lisp_Object frame;

  XSETFRAME (frame, f);
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  frame_size_history_add
    (f, Qadjust_frame_size_1, new_text_width, new_text_height,
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     list2 (parameter, make_fixnum (inhibit)));
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  /* The following two values are calculated from the old window body
     sizes and any "new" settings for scroll bars, dividers, fringes and
     margins (though the latter should have been processed already).  */
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  min_windows_width
    = frame_windows_min_size (frame, Qt, (inhibit == 5) ? Qt : Qnil, Qt);
  min_windows_height
    = frame_windows_min_size (frame, Qnil, (inhibit == 5) ? Qt : Qnil, Qt);
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  if (inhibit >= 2 && inhibit <= 4)
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    /* When INHIBIT is in [2..4] inhibit if the "old" window sizes stay
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       within the limits and either resizing is inhibited or INHIBIT
       equals 4.  */
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    {
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      inhibit_horizontal = (windows_width >= min_windows_width
                            && (inhibit == 4
                                || frame_inhibit_resize (f, true, parameter)));
      inhibit_vertical = (windows_height >= min_windows_height
                          && (inhibit == 4
                              || frame_inhibit_resize (f, false, parameter)));
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    }
  else
    /* Otherwise inhibit if INHIBIT equals 5.  */
    inhibit_horizontal = inhibit_vertical = inhibit == 5;

  new_pixel_width = ((inhibit_horizontal && (inhibit < 5))
		     ? old_pixel_width
		     : max (FRAME_TEXT_TO_PIXEL_WIDTH (f, new_text_width),
			    min_windows_width
			    + 2 * FRAME_INTERNAL_BORDER_WIDTH (f)));
  new_windows_width = new_pixel_width - 2 * FRAME_INTERNAL_BORDER_WIDTH (f);
  new_text_width = FRAME_PIXEL_TO_TEXT_WIDTH (f, new_pixel_width);
  new_cols = new_text_width / unit_width;

  new_pixel_height = ((inhibit_vertical && (inhibit < 5))
		      ? old_pixel_height
		      : max (FRAME_TEXT_TO_PIXEL_HEIGHT (f, new_text_height),
			     min_windows_height
			     + FRAME_TOP_MARGIN_HEIGHT (f)
			     + 2 * FRAME_INTERNAL_BORDER_WIDTH (f)));
  new_windows_height = (new_pixel_height
			- FRAME_TOP_MARGIN_HEIGHT (f)
			- 2 * FRAME_INTERNAL_BORDER_WIDTH (f));
  new_text_height = FRAME_PIXEL_TO_TEXT_HEIGHT (f, new_pixel_height);
  new_lines = new_text_height / unit_height;

#ifdef HAVE_WINDOW_SYSTEM
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  if (FRAME_WINDOW_P (f)
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      && f->can_set_window_size
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      && ((!inhibit_horizontal
	   && (new_pixel_width != old_pixel_width
	       || inhibit == 0 || inhibit == 2))
	  || (!inhibit_vertical
	      && (new_pixel_height != old_pixel_height
		  || inhibit == 0 || inhibit == 2))))
    /* We are either allowed to change the frame size or the minimum
       sizes request such a change.  Do not care for fixing minimum
       sizes here, we do that eventually when we're called from
       change_frame_size.  */
    {
      /* Make sure we respect fullheight and fullwidth.  */
      if (inhibit_horizontal)
	new_text_width = old_text_width;
      else if (inhibit_vertical)
	new_text_height = old_text_height;

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      frame_size_history_add
	(f, Qadjust_frame_size_2, new_text_width, new_text_height,
	 list2 (inhibit_horizontal ? Qt : Qnil,
		inhibit_vertical ? Qt : Qnil));
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      if (FRAME_TERMINAL (f)->set_window_size_hook)
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        FRAME_TERMINAL (f)->set_window_size_hook
	  (f, 0, new_text_width, new_text_height, 1);
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      f->resized_p = true;

      return;
    }
#endif

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  if ((XWINDOW (FRAME_ROOT_WINDOW (f))->pixel_top
       == FRAME_TOP_MARGIN_HEIGHT (f))
      && new_text_width == old_text_width
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      && new_text_height == old_text_height
      && new_windows_width == old_windows_width
      && new_windows_height == old_windows_height
      && new_pixel_width == old_pixel_width
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      && new_pixel_height == old_pixel_height
      && new_cols == old_cols
      && new_lines == old_lines)
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    /* No change.  Sanitize window sizes and return.  */
    {
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      sanitize_window_sizes (Qt);
      sanitize_window_sizes (Qnil);
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      return;
    }

  block_input ();

#ifdef MSDOS
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  /* We only can set screen dimensions to certain values supported by
     our video hardware.  Try to find the smallest size greater or
     equal to the requested dimensions, while accounting for the fact
     that the menu-bar lines are not counted in the frame height.  */
  int dos_new_lines = new_lines + FRAME_TOP_MARGIN (f);
  dos_set_window_size (&dos_new_lines, &new_cols);
  new_lines = dos_new_lines - FRAME_TOP_MARGIN (f);
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#endif

  if (new_windows_width != old_windows_width)
    {
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      resize_frame_windows (f, new_windows_width, true);
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      /* MSDOS frames cannot PRETEND, as they change frame size by
	 manipulating video hardware.  */
      if ((FRAME_TERMCAP_P (f) && !pretend) || FRAME_MSDOS_P (f))
	FrameCols (FRAME_TTY (f)) = new_cols;

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#if defined (HAVE_WINDOW_SYSTEM)
      if (WINDOWP (f->tab_bar_window))
	{
	  XWINDOW (f->tab_bar_window)->pixel_width = new_windows_width;
	  XWINDOW (f->tab_bar_window)->total_cols
	    = new_windows_width / unit_width;
	}
#endif

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#if defined (HAVE_WINDOW_SYSTEM) && ! defined (HAVE_EXT_TOOL_BAR)
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      if (WINDOWP (f->tool_bar_window))
	{
	  XWINDOW (f->tool_bar_window)->pixel_width = new_windows_width;
	  XWINDOW (f->tool_bar_window)->total_cols
	    = new_windows_width / unit_width;
	}
#endif
    }
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  else if (new_cols != old_cols)
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    call2 (Qwindow__pixel_to_total, frame, Qt);
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  if (new_windows_height != old_windows_height
      /* When the top margin has changed we have to recalculate the top
	 edges of all windows.  No such calculation is necessary for the
	 left edges.  */
      || WINDOW_TOP_PIXEL_EDGE (r) != FRAME_TOP_MARGIN_HEIGHT (f))
    {
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      resize_frame_windows (f, new_windows_height, false);
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      /* MSDOS frames cannot PRETEND, as they change frame size by
	 manipulating video hardware.  */
      if ((FRAME_TERMCAP_P (f) && !pretend) || FRAME_MSDOS_P (f))
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	FrameRows (FRAME_TTY (f)) = new_lines + FRAME_TOP_MARGIN (f);
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    }
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  else if (new_lines != old_lines)
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    call2 (Qwindow__pixel_to_total, frame, Qnil);
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  frame_size_history_add
    (f, Qadjust_frame_size_3, new_text_width, new_text_height,
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     list4i (old_pixel_width, old_pixel_height,
	     new_pixel_width, new_pixel_height));
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  /* Assign new sizes.  */
  FRAME_TEXT_WIDTH (f) = new_text_width;
  FRAME_TEXT_HEIGHT (f) = new_text_height;
  FRAME_PIXEL_WIDTH (f) = new_pixel_width;
  FRAME_PIXEL_HEIGHT (f) = new_pixel_height;
  SET_FRAME_COLS (f, new_cols);
  SET_FRAME_LINES (f, new_lines);

  {
    struct window *w = XWINDOW (FRAME_SELECTED_WINDOW (f));
    int text_area_x, text_area_y, text_area_width, text_area_height;

    window_box (w, TEXT_AREA, &text_area_x, &text_area_y, &text_area_width,
		&text_area_height);
    if (w->cursor.x >= text_area_x + text_area_width)
      w->cursor.hpos = w->cursor.x = 0;
    if (w->cursor.y >= text_area_y + text_area_height)
      w->cursor.vpos = w->cursor.y = 0;
  }

  /* Sanitize window sizes.  */
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  sanitize_window_sizes (Qt);
  sanitize_window_sizes (Qnil);
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  adjust_frame_glyphs (f);
  calculate_costs (f);
  SET_FRAME_GARBAGED (f);

  /* A frame was "resized" if one of its pixelsizes changed, even if its
     X window wasn't resized at all.  */
  f->resized_p = (new_pixel_width != old_pixel_width
		  || new_pixel_height != old_pixel_height);

  unblock_input ();
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#ifdef HAVE_WINDOW_SYSTEM
  {
    /* Adjust size of F's child frames.  */
    Lisp_Object frames, frame1;

    FOR_EACH_FRAME (frames, frame1)
      if (FRAME_PARENT_FRAME (XFRAME (frame1)) == f)
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	keep_ratio (XFRAME (frame1), f, old_pixel_width, old_pixel_height,
		    new_pixel_width, new_pixel_height);
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  }
#endif
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}

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/* Allocate basically initialized frame.  */

static struct frame *
allocate_frame (void)
{
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  return ALLOCATE_ZEROED_PSEUDOVECTOR (struct frame, tool_bar_items,
				       PVEC_FRAME);
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}
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struct frame *
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make_frame (bool mini_p)
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{
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  Lisp_Object frame;
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  struct frame *f;
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  struct window *rw, *mw UNINIT;
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  Lisp_Object root_window;
  Lisp_Object mini_window;
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  f = allocate_frame ();
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  XSETFRAME (frame, f);
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#ifdef USE_GTK
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  /* Initialize Lisp data.  Note that allocate_frame initializes all
     Lisp data to nil, so do it only for slots which should not be nil.  */
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  fset_tool_bar_position (f, Qtop);
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#endif
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  /* Initialize non-Lisp data.  Note that allocate_frame zeroes out all
     non-Lisp data, so do it only for slots which should not be zero.
     To avoid subtle bugs and for the sake of readability, it's better to
     initialize enum members explicitly even if their values are zero.  */
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  f->wants_modeline = true;
  f->redisplay = true;
  f->garbaged = true;
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  f->can_set_window_size = false;
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  f->after_make_frame = false;
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  f->inhibit_horizontal_resize = false;
  f->inhibit_vertical_resize = false;
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  f->tab_bar_redisplayed = false;
  f->tab_bar_resized = false;
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  f->tool_bar_redisplayed = false;
  f->tool_bar_resized = false;
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  f->column_width = 1;  /* !FRAME_WINDOW_P value.  */
  f->line_height = 1;  /* !FRAME_WINDOW_P value.  */
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#ifdef HAVE_WINDOW_SYSTEM
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  f->vertical_scroll_bar_type = vertical_scroll_bar_none;
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  f->horizontal_scroll_bars = false;
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  f->want_fullscreen = FULLSCREEN_NONE;
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  f->undecorated = false;
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  f->no_special_glyphs = false;
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#ifndef HAVE_NTGUI
  f->override_redirect = false;
#endif
  f->skip_taskbar = false;
  f->no_focus_on_map = false;
  f->no_accept_focus = false;
  f->z_group = z_group_none;
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  f->tooltip = false;
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  f->last_tab_bar_item = -1;
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#ifndef HAVE_EXT_TOOL_BAR
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  f->last_tool_bar_item = -1;
#endif
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#ifdef NS_IMPL_COCOA
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  f->ns_appearance = ns_appearance_system_default;
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  f->ns_transparent_titlebar = false;
#endif
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#endif
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  /* This one should never be zero.  */
  f->change_stamp = 1;
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  root_window = make_window ();
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  rw = XWINDOW (root_window);
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  if (mini_p)
    {
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      mini_window = make_window ();
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      mw = XWINDOW (mini_window);
      wset_next (rw, mini_window);
      wset_prev (mw, root_window);
      mw->mini = 1;
      wset_frame (mw, frame);
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      fset_minibuffer_window (f, mini_window);
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      store_frame_param (f, Qminibuffer, Qt);
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    }
  else
    {
      mini_window = Qnil;
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      wset_next (rw, Qnil);
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      fset_minibuffer_window (f, Qnil);
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    }

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  wset_frame (rw, frame);
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  /* 10 is arbitrary,
     just so that there is "something there."
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     Correct size will be set up later with adjust_frame_size.  */
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  SET_FRAME_COLS (f, 10);
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  SET_FRAME_LINES (f, 10);
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  SET_FRAME_WIDTH (f, FRAME_COLS (f) * FRAME_COLUMN_WIDTH (f));
  SET_FRAME_HEIGHT (f, FRAME_LINES (f) * FRAME_LINE_HEIGHT (f));
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  rw->total_cols = 10;
  rw->pixel_width = rw->total_cols * FRAME_COLUMN_WIDTH (f);
  rw->total_lines = mini_p ? 9 : 10;
  rw->pixel_height = rw->total_lines * FRAME_LINE_HEIGHT (f);
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  if (mini_p)
    {
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      mw->top_line = rw->total_lines;
      mw->pixel_top = rw->pixel_height;
      mw->total_cols = rw->total_cols;
      mw->pixel_width = rw->pixel_width;
      mw->total_lines = 1;
      mw->pixel_height = FRAME_LINE_HEIGHT (f);
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    }

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  /* Choose a buffer for the frame's root window.  */
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  {
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    Lisp_Object buf = Fcurrent_buffer ();
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    /* If current buffer is hidden, try to find another one.  */
    if (BUFFER_HIDDEN_P (XBUFFER (buf)))
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      buf = other_buffer_safely (buf);
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    /* Use set_window_buffer, not Fset_window_buffer, and don't let
       hooks be run by it.  The reason is that the whole frame/window
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       arrangement is not yet fully initialized at this point.  Windows
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       don't have the right size, glyph matrices aren't initialized
       etc.  Running Lisp functions at this point surely ends in a
       SEGV.  */
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    set_window_buffer (root_window, buf, 0, 0);
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    fset_buffer_list (f, list1 (buf));
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  }

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  if (mini_p)
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    set_window_buffer (mini_window,
		       (NILP (Vminibuffer_list)
			? get_minibuffer (0)
			: Fcar (Vminibuffer_list)),
		       0, 0);
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  fset_root_window (f, root_window);
  fset_selected_window (f, root_window);
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  /* Make sure this window seems more recently used than
     a newly-created, never-selected window.  */
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  XWINDOW (f->selected_window)->use_time = ++window_select_count;
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  return f;
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}

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#ifdef HAVE_WINDOW_SYSTEM
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/* Make a frame using a separate minibuffer window on another frame.
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   MINI_WINDOW is the minibuffer window to use.  nil means use the
   default (the global minibuffer).  */

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struct frame *
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make_frame_without_minibuffer (Lisp_Object mini_window, KBOARD *kb,
			       Lisp_Object display)
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{
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  struct frame *f;
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  if (!NILP (mini_window))
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    CHECK_LIVE_WINDOW (mini_window);
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  if (!NILP (mini_window)
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      && FRAME_KBOARD (XFRAME (XWINDOW (mini_window)->frame)) != kb)
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    error ("Frame and minibuffer must be on the same terminal");
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  /* Make a frame containing just a root window.  */
  f = make_frame (0);
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  if (NILP (mini_window))
    {
      /* Use default-minibuffer-frame if possible.  */
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      if (!FRAMEP (KVAR (kb, Vdefault_minibuffer_frame))
	  || ! FRAME_LIVE_P (XFRAME (KVAR (kb, Vdefault_minibuffer_frame))))
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	{
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          Lisp_Object frame_dummy;

          XSETFRAME (frame_dummy, f);
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	  /* If there's no minibuffer frame to use, create one.  */
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	  kset_default_minibuffer_frame
	    (kb, call1 (intern ("make-initial-minibuffer-frame"), display));
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	}
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      mini_window
	= XFRAME (KVAR (kb, Vdefault_minibuffer_frame))->minibuffer_window;
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    }
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  fset_minibuffer_window (f, mini_window);
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  store_frame_param (f, Qminibuffer, mini_window);
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  /* Make the chosen minibuffer window display the proper minibuffer,
     unless it is already showing a minibuffer.  */
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  if (NILP (Fmemq (XWINDOW (mini_window)->contents, Vminibuffer_list)))
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    /* Use set_window_buffer instead of Fset_window_buffer (see
       discussion of bug#11984, bug#12025, bug#12026).  */
    set_window_buffer (mini_window,
		       (NILP (Vminibuffer_list)
			? get_minibuffer (0)
			: Fcar (Vminibuffer_list)), 0, 0);
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  return f;
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}

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/* Make a frame containing only a minibuffer window.  */
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struct frame *
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make_minibuffer_frame (void)
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{
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  /* First make a frame containing just a root window, no minibuffer.  */
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  register struct frame *f = make_frame (0);
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  register Lisp_Object mini_window;
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  register Lisp_Object frame;
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  XSETFRAME (frame, f);
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  f->auto_raise = 0;
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  f->auto_lower = 0;
  f->no_split = 1;
  f->wants_modeline = 0;
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  /* Now label the root window as also being the minibuffer.
     Avoid infinite looping on the window chain by marking next pointer
     as nil. */

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  mini_window = f->root_window;
  fset_minibuffer_window (f, mini_window);
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  store_frame_param (f, Qminibuffer, Qonly);
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  XWINDOW (mini_window)->mini = 1;
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  wset_next (XWINDOW (mini_window), Qnil);
  wset_prev (XWINDOW (mini_window), Qnil);
  wset_frame (XWINDOW (mini_window), frame);
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  /* Put the proper buffer in that window.  */

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  /* Use set_window_buffer instead of Fset_window_buffer (see
     discussion of bug#11984, bug#12025, bug#12026).  */
  set_window_buffer (mini_window,
		     (NILP (Vminibuffer_list)
		      ? get_minibuffer (0)
		      : Fcar (Vminibuffer_list)), 0, 0);
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  return f;
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}
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#endif /* HAVE_WINDOW_SYSTEM */
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1088

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/* Construct a frame that refers to a terminal.  */
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static intmax_t tty_frame_count;
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struct frame *
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make_initial_frame (void)
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{
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  struct frame *f;
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  struct terminal *terminal;
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  Lisp_Object frame;
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  eassert (initial_kboard);
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  eassert (NILP (Vframe_list) || CONSP (Vframe_list));
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  terminal = init_initial_terminal ();
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  f = make_frame (1);
  XSETFRAME (frame, f);

  Vframe_list = Fcons (frame, Vframe_list);

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  tty_frame_count = 1;
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  fset_name (f, build_pure_c_string ("F1"));
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  SET_FRAME_VISIBLE (f, 1);
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  f->output_method = terminal->type;
  f->terminal = terminal;
  f->terminal->reference_count++;
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  FRAME_FOREGROUND_PIXEL (f) = FACE_TTY_DEFAULT_FG_COLOR;
  FRAME_BACKGROUND_PIXEL (f) = FACE_TTY_DEFAULT_BG_COLOR;
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#ifdef HAVE_WINDOW_SYSTEM
  f->vertical_scroll_bar_type = vertical_scroll_bar_none;
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  f->horizontal_scroll_bars = false;
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#endif
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  /* The default value of menu-bar-mode is t.  */
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  set_menu_bar_lines (f, make_fixnum (1), Qnil);
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  /* The default value of tab-bar-mode is nil.  */
  set_tab_bar_lines (f, make_fixnum (0), Qnil);

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  /* Allocate glyph matrices.  */
  adjust_frame_glyphs (f);

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  if (!noninteractive)
    init_frame_faces (f);

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  last_nonminibuf_frame = f;

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  f->can_set_window_size = true;
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  f->after_make_frame = true;

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  return f;
}


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static struct frame *
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make_terminal_frame (struct terminal *terminal)
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{
  register struct frame *f;
  Lisp_Object frame;
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  char name[sizeof "F" + INT_STRLEN_BOUND (tty_frame_count)];
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  if (!terminal->name)
    error ("Terminal is not live, can't create new frames on it");
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  f = make_frame (1);
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  XSETFRAME (frame, f);
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  Vframe_list = Fcons (frame, Vframe_list);

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  fset_name (f, make_formatted_string (name, "F%"PRIdMAX, ++tty_frame_count));
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  SET_FRAME_VISIBLE (f, 1);

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  f->terminal = terminal;
  f->terminal->reference_count++;
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#ifdef MSDOS
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  f->output_data.tty = &the_only_tty_output;
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  f->output_data.tty->display_info = &the_only_display_info;
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  if (!inhibit_window_system
      && (!FRAMEP (selected_frame) || !FRAME_LIVE_P (XFRAME (selected_frame))
	  || XFRAME (selected_frame)->output_method == output_msdos_raw))
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    f->output_method = output_msdos_raw;
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  else
    f->output_method = output_termcap;
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#else /* not MSDOS */
  f->output_method = output_termcap;
  create_tty_output (f);
  FRAME_FOREGROUND_PIXEL (f) = FACE_TTY_DEFAULT_FG_COLOR;
  FRAME_BACKGROUND_PIXEL (f) = FACE_TTY_DEFAULT_BG_COLOR;
#endif /* not MSDOS */
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#ifdef HAVE_WINDOW_SYSTEM
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  f->vertical_scroll_bar_type = vertical_scroll_bar_none;
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  f->horizontal_scroll_bars = false;
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#endif
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  FRAME_MENU_BAR_LINES (f) = NILP (Vmenu_bar_mode) ? 0 : 1;
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  FRAME_TAB_BAR_LINES (f) = NILP (Vtab_bar_mode) ? 0 : 1;
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  FRAME_LINES (f) = FRAME_LINES (f) - FRAME_MENU_BAR_LINES (f)
    - FRAME_TAB_BAR_LINES (f);
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  FRAME_MENU_BAR_HEIGHT (f) = FRAME_MENU_BAR_LINES (f) * FRAME_LINE_HEIGHT (f);
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  FRAME_TAB_BAR_HEIGHT (f) = FRAME_TAB_BAR_LINES (f) * FRAME_LINE_HEIGHT (f);
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  FRAME_TEXT_HEIGHT (f) = FRAME_TEXT_HEIGHT (f) - FRAME_MENU_BAR_HEIGHT (f)
    - FRAME_TAB_BAR_HEIGHT (f);
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  /* Set the top frame to the newly created frame.  */
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  if (FRAMEP (FRAME_TTY (f)->top_frame)
      && FRAME_LIVE_P (XFRAME (FRAME_TTY (f)->top_frame)))
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    SET_FRAME_VISIBLE (XFRAME (FRAME_TTY (f)->top_frame), 2); /* obscured */
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  FRAME_TTY (f)->top_frame = frame;

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  if (!noninteractive)
    init_frame_faces (f);
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  return f;
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}
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/* Get a suitable value for frame parameter PARAMETER for a newly
   created frame, based on (1) the user-supplied frame parameter
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   alist SUPPLIED_PARMS, and (2) CURRENT_VALUE.  */
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static Lisp_Object
get_future_frame_param (Lisp_Object parameter,
                        Lisp_Object supplied_parms,
                        char *current_value)
{
  Lisp_Object result;

  result = Fassq (parameter, supplied_parms);
  if (NILP (result))
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    result = Fassq (parameter, XFRAME (selected_frame)->param_alist);
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  if (NILP (result) && current_value != NULL)
    result = build_string (current_value);
  if (!NILP (result) && !STRINGP (result))
    result = XCDR (result);
  if (NILP (result) || !STRINGP (result))
    result = Qnil;

  return result;
}

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DEFUN ("make-terminal-frame", Fmake_terminal_frame, Smake_terminal_frame,
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       1, 1, 0,
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       doc: /* Create an additional terminal frame, possibly on another terminal.
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This function takes one argument, an alist specifying frame parameters.
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You can create multiple frames on a single text terminal, but only one
of them (the selected terminal frame) is actually displayed.
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In practice, generally you don't need to specify any parameters,
except when you want to create a new frame on another terminal.
In that case, the `tty' parameter specifies the device file to open,
and the `tty-type' parameter specifies the terminal type.  Example:

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   (make-terminal-frame \\='((tty . "/dev/pts/5") (tty-type . "xterm")))
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Note that changing the size of one terminal frame automatically
affects all frames on the same terminal device.  */)
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  (Lisp_Object parms)
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{
  struct frame *f;
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  struct terminal *t = NULL;
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  Lisp_Object frame, tem;
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  struct frame *sf = SELECTED_FRAME ();
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#ifdef MSDOS
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  if (sf->output_method != output_msdos_raw
      && sf->output_method != output_termcap)