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+/* Define screen-object for GNU Emacs.
+   Copyright (C) 1988 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, 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.  */
+
+
+#ifdef MULTI_SCREEN
+
+enum output_method
+{ output_termcap, output_x_window };
+
+struct screen
+{
+  int size;
+  struct Lisp_Vector *next;
+
+  /* glyphs as they appear on the screen */
+  struct screen_glyphs *current_glyphs;
+
+  /* glyphs we'd like to appear on the screen */
+  struct screen_glyphs *desired_glyphs;
+
+  /* Cost of inserting 1 line on this screen */
+  int *insert_line_cost;
+
+  /* Cost of deleting 1 line on this screen */
+  int *delete_line_cost;
+
+  /* Cost of inserting n lines on this screen */
+  int *insert_n_lines_cost;
+
+  /* Cost of deleting n lines on this screen */
+  int *delete_n_lines_cost;
+
+  /* glyphs for the mode line */
+  struct screen_glyphs *temp_glyphs;
+
+  /* Intended cursor position of this screen.
+     Measured in characters, counting from upper left corner
+     within the screen.  */
+  int cursor_x;
+  int cursor_y;
+
+  /* Actual cursor position of this screen.
+     (Not used for terminal screens.)  */
+  int phys_cursor_x;
+  int phys_cursor_y;
+
+  /* Size of this screen, in units of characters.  */
+  int height;
+  int width;
+
+  /* New height and width for pending size change.  0 if no change pending.  */
+  int new_height, new_width;
+
+  /* Name of this screen: a Lisp string.  */
+  Lisp_Object name;
+
+  /* This screen's root window.  Every screen has one.
+     If the screen has only a minibuffer window, this is it.
+     Otherwise, if the screen has a minibuffer window, this is its sibling.  */
+  Lisp_Object root_window;
+
+  /* This screen's selected window.
+     Each screen has its own window hierarchy
+     and one of the windows in it is selected within the screen.
+     The selected window of the selected screen is Emacs's selected window.  */
+  Lisp_Object selected_window;
+
+  /* This screen's minibuffer window.
+     Most screens have their own minibuffer windows,
+     but only the selected screen's minibuffer window
+     can actually appear to exist.  */
+  Lisp_Object minibuffer_window;
+
+  /* Parameter alist of this screen.
+     These are the parameters specified when creating the screen
+     or modified with modify-screen-parameters.  */
+  Lisp_Object param_alist;
+
+  /* The output method says how the contents of this screen
+     are displayed.  It could be using termcap, or using an X window.  */
+  enum output_method output_method;
+
+  /* A structure of auxiliary data used for displaying the contents.
+     struct x_display is used for X window screens;
+     it is defined in xterm.h.  */
+  union display { struct x_display *x; int nothing; } display;
+
+  /* Nonzero if last attempt at redisplay on this screen was preempted.  */
+  char display_preempted;
+
+  /* Nonzero if screen is currently displayed.  */
+  char visible;
+
+  /* Nonzero if window is currently iconified.
+     This and visible are mutually exclusive.  */
+  char iconified;
+
+  /* Nonzero if this screen should be redrawn.  */
+  char garbaged;
+
+  /* True if screen actually has a  minibuffer window on it.
+     0 if using a minibuffer window that isn't on this screen.  */
+  char has_minibuffer;
+     
+  /* 0 means, if this screen has just one window,
+     show no modeline for that window.  */
+  char wants_modeline;
+
+  /* Non-0 means raise this screen to the top of the heap when selected.  */
+  char auto_raise;
+
+  /* Non-0 means lower this screen to the bottom of the stack when left.  */
+  char auto_lower;
+
+  /* True if screen's root window can't be split.  */
+  char no_split;
+
+  /* Storage for messages to this screen. */
+  char *message_buf;
+
+  /* Nonnegative if current redisplay should not do scroll computation
+     for lines beyond a certain vpos.  This is the vpos.  */
+  int scroll_bottom_vpos;
+};
+
+typedef struct screen *SCREEN_PTR;
+
+#define XSCREEN(p) ((struct screen *) XPNTR (p))
+#define XSETSCREEN(p, v) ((struct screen *) XSETPNTR (p, v))
+
+#define WINDOW_SCREEN(w) (w)->screen
+
+#define SET_SCREEN_GARBAGED(s) (screen_garbaged = 1, s->garbaged = 1)
+#define SCREEN_IS_TERMCAP(s) ((s)->output_method == output_termcap)
+#define SCREEN_IS_X(s) ((s)->output_method == output_x_window)
+#define SCREEN_CURRENT_GLYPHS(s) (s)->current_glyphs
+#define SCREEN_DESIRED_GLYPHS(s) (s)->desired_glyphs
+#define SCREEN_TEMP_GLYPHS(s) (s)->temp_glyphs
+#define SCREEN_HEIGHT(s) (s)->height
+#define SCREEN_WIDTH(s) (s)->width
+#define SCREEN_NEW_HEIGHT(s) (s)->new_height
+#define SCREEN_NEW_WIDTH(s) (s)->new_width
+#define SCREEN_CURSOR_X(s) (s)->cursor_x
+#define SCREEN_CURSOR_Y(s) (s)->cursor_y
+#define SCREEN_VISIBLE_P(s) (s)->visible
+#define SCREEN_GARBAGED_P(s) (s)->garbaged
+#define SCREEN_NO_SPLIT_P(s) (s)->no_split
+#define SCREEN_WANTS_MODELINE_P(s) (s)->wants_modeline
+#define SCREEN_ICONIFIED_P(s) (s)->iconified
+#define SCREEN_MINIBUF_WINDOW(s) (s)->minibuffer_window
+#define SCREEN_ROOT_WINDOW(s) (s)->root_window
+#define SCREEN_SELECTED_WINDOW(s) (s)->selected_window
+#define SCREENP(s) (XTYPE(s) == Lisp_Screen)
+#define SET_GLYPHS_SCREEN(glyphs,screen) ((glyphs)->screen = (screen))
+#define SCREEN_INSERT_COST(s) (s)->insert_line_cost    
+#define SCREEN_DELETE_COST(s) (s)->delete_line_cost    
+#define SCREEN_INSERTN_COST(s) (s)->insert_n_lines_cost
+#define SCREEN_DELETEN_COST(s) (s)->delete_n_lines_cost
+#define SCREEN_MESSAGE_BUF(s) (s)->message_buf
+#define SCREEN_SCROLL_BOTTOM_VPOS(s) (s)->scroll_bottom_vpos
+
+#define CHECK_SCREEN(x, i) \
+  { if (XTYPE ((x)) != Lisp_Screen) x = wrong_type_argument (Qscreenp, (x)); }
+extern Lisp_Object Qscreenp;
+
+extern struct screen *selected_screen;
+
+extern struct screen *make_terminal_screen ();
+extern struct screen *make_screen ();
+extern struct screen *make_minibuffer_screen ();
+extern struct screen *make_screen_without_minibuffer ();
+
+extern Lisp_Object Vscreen_list;
+extern Lisp_Object Vglobal_minibuffer_screen;
+
+extern Lisp_Object Vterminal_screen;
+
+#else /* not MULTI_SCREEN */
+
+/* These definitions are used in a single-screen version of Emacs.  */
+
+#define SCREEN_PTR int
+
+extern int selected_screen;
+
+#define XSCREEN(s) selected_screen
+#define WINDOW_SCREEN(w) selected_screen
+
+#define SET_SCREEN_GARBAGED(s) (screen_garbaged = 1)
+#define SCREEN_IS_TERMCAP(s) 1
+#define SCREEN_CURRENT_GLYPHS(s) current_glyphs
+#define SCREEN_DESIRED_GLYPHS(s) desired_glyphs
+#define SCREEN_TEMP_GLYPHS(s) temp_glyphs
+#define SCREEN_HEIGHT(s) screen_height
+#define SCREEN_WIDTH(s) screen_width
+#define SCREEN_NEW_HEIGHT(s) delayed_screen_height
+#define SCREEN_NEW_WIDTH(s) delayed_screen_width
+#define SCREEN_CURSOR_X(s) cursX
+#define SCREEN_CURSOR_Y(s) cursY
+#define SCREEN_VISIBLE_P(s) 1
+#define SCREEN_GARBAGED_P(s) screen_garbaged
+#define SCREEN_NO_SPLIT_P(s) 0
+#define SCREEN_WANTS_MODELINE_P(s) 1
+#define SCREEN_ICONIFIED_P(s) 0
+#define SCREEN_MINIBUF_WINDOW(s) minibuf_window
+#define SCREEN_ROOT_WINDOW(s) root_window
+#define SCREEN_SELECTED_WINDOW(s) selected_window
+#define SCREENP(s) 0
+#define SET_GLYPHS_SCREEN(glyphs,screen)
+#define SCREEN_INSERT_COST(screen)  insert_line_cost    
+#define SCREEN_DELETE_COST(screen)  delete_line_cost    
+#define SCREEN_INSERTN_COST(screen) insert_n_lines_cost
+#define SCREEN_DELETEN_COST(screen) delete_n_lines_cost
+#define SCREEN_MESSAGE_BUF(s) message_buf
+#define SCREEN_SCROLL_BOTTOM_VPOS scroll_bottom_vpos;
+
+extern int screen_width, screen_height;
+extern int cursX, cursY;
+
+#endif /* not MULTI_SCREEN */