code.delx.au - gnu-emacs/blob - src/termhooks.h

   1 /* Parameters and display hooks for output devices.
   2    Copyright (C) 1985, 1986, 1993, 1994, 2002, 2003, 2004,
   3                  2005 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 \f
  23 /* Miscellanea.   */
  24
  25 struct glyph;
  26 struct frame;
  27
  28 /* Only use prototypes when lisp.h has been included.  */
  29 #ifndef P_
  30 #define P_(X) ()
  31 #endif
  32 \f
  33
  34 enum scroll_bar_part {
  35   scroll_bar_above_handle,
  36   scroll_bar_handle,
  37   scroll_bar_below_handle,
  38   scroll_bar_up_arrow,
  39   scroll_bar_down_arrow,
  40   scroll_bar_to_top,
  41   scroll_bar_to_bottom,
  42   scroll_bar_end_scroll,
  43   scroll_bar_move_ratio
  44 };
  45
  46 \f
  47 /* Input queue declarations and hooks.  */
  48
  49 /* Expedient hack: only provide the below definitions to files that
  50    are prepared to handle lispy things.  CONSP is defined iff lisp.h
  51    has been included before this file.  */
  52 #ifdef CONSP
  53
  54 enum event_kind
  55 {
  56   NO_EVENT,                     /* nothing happened.  This should never
  57                                    actually appear in the event queue.  */
  58
  59   ASCII_KEYSTROKE_EVENT,        /* The ASCII code is in .code, perhaps
  60                                    with modifiers applied.
  61                                    .modifiers holds the state of the
  62                                    modifier keys.
  63                                    .frame_or_window is the frame in
  64                                    which the key was typed.
  65                                    .timestamp gives a timestamp (in
  66                                    milliseconds) for the keystroke.  */
  67   MULTIBYTE_CHAR_KEYSTROKE_EVENT,       /* The multibyte char code is in .code,
  68                                    perhaps with modifiers applied.
  69                                    The others are the same as
  70                                    ASCII_KEYSTROKE_EVENT.  */
  71   NON_ASCII_KEYSTROKE_EVENT,    /* .code is a number identifying the
  72                                    function key.  A code N represents
  73                                    a key whose name is
  74                                    function_key_names[N]; function_key_names
  75                                    is a table in keyboard.c to which you
  76                                    should feel free to add missing keys.
  77                                    .modifiers holds the state of the
  78                                    modifier keys.
  79                                    .frame_or_window is the frame in
  80                                    which the key was typed.
  81                                    .timestamp gives a timestamp (in
  82                                    milliseconds) for the keystroke.  */
  83   TIMER_EVENT,                  /* A timer fired.  */
  84   MOUSE_CLICK_EVENT,            /* The button number is in .code; it must
  85                                    be >= 0 and < NUM_MOUSE_BUTTONS, defined
  86                                    below.
  87                                    .modifiers holds the state of the
  88                                    modifier keys.
  89                                    .x and .y give the mouse position,
  90                                    in characters, within the window.
  91                                    .frame_or_window gives the frame
  92                                    the mouse click occurred in.
  93                                    .timestamp gives a timestamp (in
  94                                    milliseconds) for the click.  */
  95   WHEEL_EVENT,                  /* A wheel event is generated by a
  96                                    wheel on a mouse (e.g., MS
  97                                    Intellimouse).
  98                                    .modifiers holds the rotate
  99                                    direction (up or down), and the
 100                                    state of the modifier keys.
 101                                    .x and .y give the mouse position,
 102                                    in characters, within the window.
 103                                    .frame_or_window gives the frame
 104                                    the wheel event occurred in.
 105                                    .timestamp gives a timestamp (in
 106                                    milliseconds) for the event.  */
 107 #if defined (WINDOWSNT) || defined (MAC_OS)
 108   LANGUAGE_CHANGE_EVENT,        /* A LANGUAGE_CHANGE_EVENT is
 109                                    generated on WINDOWSNT or Mac OS
 110                                    when the keyboard layout or input
 111                                    language is changed by the
 112                                    user.  */
 113 #endif
 114   SCROLL_BAR_CLICK_EVENT,       /* .code gives the number of the mouse button
 115                                    that was clicked.
 116                                    .modifiers holds the state of the modifier
 117                                    keys.
 118                                    .part is a lisp symbol indicating which
 119                                    part of the scroll bar got clicked.
 120                                    .x gives the distance from the start of the
 121                                    scroll bar of the click; .y gives the total
 122                                    length of the scroll bar.
 123                                    .frame_or_window gives the window
 124                                    whose scroll bar was clicked in.
 125                                    .timestamp gives a timestamp (in
 126                                    milliseconds) for the click.  */
 127 #ifdef WINDOWSNT
 128   W32_SCROLL_BAR_CLICK_EVENT,   /* as for SCROLL_BAR_CLICK, but only generated
 129                                    by MS-Windows scroll bar controls. */
 130 #endif
 131   SELECTION_REQUEST_EVENT,      /* Another X client wants a selection from us.
 132                                    See `struct selection_input_event'.  */
 133   SELECTION_CLEAR_EVENT,        /* Another X client cleared our selection.  */
 134   BUFFER_SWITCH_EVENT,          /* A process filter has switched buffers.  */
 135   DELETE_WINDOW_EVENT,          /* An X client said "delete this window".  */
 136   MENU_BAR_EVENT,               /* An event generated by the menu bar.
 137                                    The frame_or_window field's cdr holds the
 138                                    Lisp-level event value.
 139                                    (Only the toolkit version uses these.)  */
 140   ICONIFY_EVENT,                /* An X client iconified this window.  */
 141   DEICONIFY_EVENT,              /* An X client deiconified this window.  */
 142   MENU_BAR_ACTIVATE_EVENT,      /* A button press in the menu bar
 143                                    (toolkit version only).  */
 144   DRAG_N_DROP_EVENT,            /* A drag-n-drop event is generated when
 145                                    files selected outside of Emacs are dropped
 146                                    onto an Emacs window.
 147                                    Currently used only on Windows NT.
 148                                    .modifiers holds the state of the
 149                                    modifier keys.
 150                                    .x and .y give the mouse position,
 151                                    in characters, within the window.
 152                                    .frame_or_window is a cons of the frame
 153                                    in which the drop was made and a list of
 154                                    the filenames of the dropped files.
 155                                    .timestamp gives a timestamp (in
 156                                    milliseconds) for the click.  */
 157   USER_SIGNAL_EVENT,            /* A user signal.
 158                                    code is a number identifying it,
 159                                    index into lispy_user_signals.  */
 160
 161   /* Help events.  Member `frame_or_window' of the input_event is the
 162      frame on which the event occurred, and member `arg' contains
 163      the help to show.  */
 164   HELP_EVENT,
 165
 166   /* An event from a tool-bar.  Member `arg' of the input event
 167      contains the tool-bar item selected.  If `frame_or_window'
 168      and `arg' are equal, this is a prefix event.  */
 169   TOOL_BAR_EVENT,
 170
 171   /* Queued from XTread_socket on FocusIn events.  Translated into
 172      `switch-frame' events in kbd_buffer_get_event, if necessary.  */
 173   FOCUS_IN_EVENT,
 174
 175   /* Generated when mouse moves over window not currently selected.  */
 176   SELECT_WINDOW_EVENT,
 177
 178   /* Queued from XTread_socket when session manager sends
 179      save yourself before shutdown. */
 180   SAVE_SESSION_EVENT,
 181
 182 #ifdef MAC_OS
 183   /* Generated when an Apple event, a HICommand event, or a Services
 184      menu event is received and the corresponding handler is
 185      registered.  Members `x' and `y' are for the event class and ID
 186      symbols, respectively.  Member `code' points to the Apple event
 187      descriptor.  Parameters for Non-Apple events are converted to
 188      those in Apple events.  */
 189   MAC_APPLE_EVENT
 190 #endif
 191 };
 192
 193 /* If a struct input_event has a kind which is SELECTION_REQUEST_EVENT
 194    or SELECTION_CLEAR_EVENT, then its contents are really described
 195    by `struct selection_input_event'; see xterm.h.  */
 196
 197 /* The keyboard input buffer is an array of these structures.  Each one
 198    represents some sort of input event - a keystroke, a mouse click, or
 199    a window system event.  These get turned into their lispy forms when
 200    they are removed from the event queue.  */
 201
 202 struct input_event
 203 {
 204   /* What kind of event was this?  */
 205   enum event_kind kind;
 206
 207   /* For an ASCII_KEYSTROKE_EVENT and MULTIBYTE_CHAR_KEYSTROKE_EVENT,
 208      this is the character.
 209      For a NON_ASCII_KEYSTROKE_EVENT, this is the keysym code.
 210      For a mouse event, this is the button number.  */
 211   /* In WindowsNT, for a mouse wheel event, this is the delta.  */
 212   int code;
 213   enum scroll_bar_part part;
 214
 215   int modifiers;                /* See enum below for interpretation.  */
 216
 217   Lisp_Object x, y;
 218   unsigned long timestamp;
 219
 220   /* This is padding just to put the frame_or_window field
 221      past the size of struct selection_input_event.  */
 222   int *padding[2];
 223
 224   /* This field is copied into a vector while the event is in the queue,
 225      so that garbage collections won't kill it.  */
 226   /* In a menu_bar_event, this is a cons cell whose car is the frame
 227      and whose cdr is the Lisp object that is the event's value.  */
 228   /* This field is last so that struct selection_input_event
 229      does not overlap with it.  */
 230   Lisp_Object frame_or_window;
 231
 232   /* Additional event argument.  This is used for TOOL_BAR_EVENTs and
 233      HELP_EVENTs and avoids calling Fcons during signal handling.  */
 234   Lisp_Object arg;
 235 };
 236
 237 #define EVENT_INIT(event) bzero (&(event), sizeof (struct input_event))
 238
 239 /* Bits in the modifiers member of the input_event structure.
 240    Note that reorder_modifiers assumes that the bits are in canonical
 241    order.
 242
 243    The modifiers applied to mouse clicks are rather ornate.  The
 244    window-system-specific code should store mouse clicks with
 245    up_modifier or down_modifier set.  Having an explicit down modifier
 246    simplifies some of window-system-independent code; without it, the
 247    code would have to recognize down events by checking if the event
 248    is a mouse click lacking the click and drag modifiers.
 249
 250    The window-system independent code turns all up_modifier events
 251    bits into drag_modifier, click_modifier, double_modifier, or
 252    triple_modifier events.  The click_modifier has no written
 253    representation in the names of the symbols used as event heads,
 254    but it does appear in the Qevent_symbol_components property of the
 255    event heads.  */
 256 enum {
 257   up_modifier   =   1,          /* Only used on mouse buttons - always
 258                                    turned into a click or a drag modifier
 259                                    before lisp code sees the event.  */
 260   down_modifier =   2,          /* Only used on mouse buttons.  */
 261   drag_modifier =   4,          /* This is never used in the event
 262                                    queue; it's only used internally by
 263                                    the window-system-independent code.  */
 264   click_modifier=   8,          /* See drag_modifier.  */
 265   double_modifier= 16,          /* See drag_modifier.  */
 266   triple_modifier= 32,          /* See drag_modifier.  */
 267
 268   /* The next four modifier bits are used also in keyboard events at
 269      the Lisp level.
 270
 271      It's probably not the greatest idea to use the 2^23 bit for any
 272      modifier.  It may or may not be the sign bit, depending on
 273      VALBITS, so using it to represent a modifier key means that
 274      characters thus modified have different integer equivalents
 275      depending on the architecture they're running on.  Oh, and
 276      applying XINT to a character whose 2^23 bit is set sign-extends
 277      it, so you get a bunch of bits in the mask you didn't want.
 278
 279      The CHAR_ macros are defined in lisp.h.  */
 280   alt_modifier  =  CHAR_ALT,    /* Under X, the XK_Alt_[LR] keysyms.  */
 281   super_modifier=  CHAR_SUPER,  /* Under X, the XK_Super_[LR] keysyms.  */
 282   hyper_modifier=  CHAR_HYPER,  /* Under X, the XK_Hyper_[LR] keysyms.  */
 283   shift_modifier=  CHAR_SHIFT,
 284   ctrl_modifier =  CHAR_CTL,
 285   meta_modifier =  CHAR_META    /* Under X, the XK_Meta_[LR] keysyms.  */
 286 };
 287
 288 #endif /* CONSP */
 289
 290 \f
 291 /* Device-local parameters. */
 292 struct device
 293 {
 294   /* Chain of all display devices. */
 295   struct device *next_device;
 296
 297   /* Unique id for this display device. */
 298   int id;
 299
 300   /* The number of frames that are on this device. */
 301   int reference_count;
 302
 303   /* The type of the display device. */
 304   enum output_method type;
 305
 306   /* The name of the display device.  Do not use this to identify the device. */
 307   char *name;
 308
 309 #ifdef MULTI_KBOARD
 310   /* The device's keyboard object. */
 311   struct kboard *kboard;
 312 #endif
 313
 314   /* Device-type dependent data shared amongst all frames on this display. */
 315   union display_info
 316   {
 317     struct tty_display_info *tty;     /* termchar.h */
 318     struct x_display_info *x;         /* xterm.h */
 319   } display_info;
 320
 321 \f
 322   /* Coding-system to be used for encoding terminal output.  This
 323      structure contains information of a coding-system specified by
 324      the function `set-terminal-coding-system'.  Also see
 325      `safe_terminal_coding' in coding.h.  */
 326   struct coding_system *terminal_coding;
 327
 328   /* Coding-system of what is sent from terminal keyboard.  This
 329      structure contains information of a coding-system specified by
 330      the function `set-keyboard-coding-system'.  */
 331   struct coding_system *keyboard_coding;
 332
 333   /* Terminal characteristics. */
 334   /* XXX Are these really used on non-termcap displays? */
 335
 336   int must_write_spaces;        /* Nonzero means spaces in the text must
 337                                    actually be output; can't just skip over
 338                                    some columns to leave them blank.  */
 339   int fast_clear_end_of_line;   /* Nonzero means terminal has a `ce' string */
 340
 341   int line_ins_del_ok;          /* Terminal can insert and delete lines */
 342   int char_ins_del_ok;          /* Terminal can insert and delete chars */
 343   int scroll_region_ok;         /* Terminal supports setting the scroll
 344                                    window */
 345   int scroll_region_cost;       /* Cost of setting the scroll window,
 346                                    measured in characters. */
 347   int memory_below_frame;       /* Terminal remembers lines scrolled
 348                                    off bottom */
 349
 350 #if 0  /* These are not used anywhere. */
 351   /* EMACS_INT baud_rate; */    /* Output speed in baud */
 352   int min_padding_speed;        /* Speed below which no padding necessary. */
 353   int dont_calculate_costs;     /* Nonzero means don't bother computing
 354                                    various cost tables; we won't use them. */
 355 #endif
 356
 357 \f
 358   /* Window-based redisplay interface for this device (0 for tty
 359      devices). */
 360   struct redisplay_interface *rif;
 361
 362   /* Frame-based redisplay interface. */
 363
 364   /* Text display hooks.  */
 365
 366   void (*cursor_to_hook) P_ ((struct frame *f, int vpos, int hpos));
 367   void (*raw_cursor_to_hook) P_ ((struct frame *, int, int));
 368
 369   void (*clear_to_end_hook) P_ ((struct frame *));
 370   void (*clear_frame_hook) P_ ((struct frame *));
 371   void (*clear_end_of_line_hook) P_ ((struct frame *, int));
 372
 373   void (*ins_del_lines_hook) P_ ((struct frame *f, int, int));
 374
 375   void (*insert_glyphs_hook) P_ ((struct frame *f, struct glyph *s, int n));
 376   void (*write_glyphs_hook) P_ ((struct frame *f, struct glyph *s, int n));
 377   void (*delete_glyphs_hook) P_ ((struct frame *, int));
 378
 379   void (*ring_bell_hook) P_ ((struct frame *f));
 380
 381   void (*reset_terminal_modes_hook) P_ ((struct device *));
 382   void (*set_terminal_modes_hook) P_ ((struct device *));
 383
 384   void (*update_begin_hook) P_ ((struct frame *));
 385   void (*update_end_hook) P_ ((struct frame *));
 386   void (*set_terminal_window_hook) P_ ((struct frame *, int));
 387
 388   /* Multi-frame and mouse support hooks.  */
 389
 390   /* Return the current position of the mouse.
 391
 392      Set *f to the frame the mouse is in, or zero if the mouse is in no
 393      Emacs frame.  If it is set to zero, all the other arguments are
 394      garbage.
 395
 396      If the motion started in a scroll bar, set *bar_window to the
 397      scroll bar's window, *part to the part the mouse is currently over,
 398      *x to the position of the mouse along the scroll bar, and *y to the
 399      overall length of the scroll bar.
 400
 401      Otherwise, set *bar_window to Qnil, and *x and *y to the column and
 402      row of the character cell the mouse is over.
 403
 404      Set *time to the time the mouse was at the returned position.
 405
 406      This should clear mouse_moved until the next motion
 407      event arrives.  */
 408   void (*mouse_position_hook) P_ ((struct frame **f, int,
 409                                    Lisp_Object *bar_window,
 410                                    enum scroll_bar_part *part,
 411                                    Lisp_Object *x,
 412                                    Lisp_Object *y,
 413                                    unsigned long *time));
 414
 415   /* The window system handling code should set this if the mouse has
 416      moved since the last call to the mouse_position_hook.  Calling that
 417      hook should clear this.  */
 418   int mouse_moved;
 419
 420   /* When a frame's focus redirection is changed, this hook tells the
 421      window system code to re-decide where to put the highlight.  Under
 422      X, this means that Emacs lies about where the focus is.  */
 423   void (*frame_rehighlight_hook) P_ ((struct frame *));
 424
 425   /* If we're displaying frames using a window system that can stack
 426      frames on top of each other, this hook allows you to bring a frame
 427      to the front, or bury it behind all the other windows.  If this
 428      hook is zero, that means the device we're displaying on doesn't
 429      support overlapping frames, so there's no need to raise or lower
 430      anything.
 431
 432      If RAISE is non-zero, F is brought to the front, before all other
 433      windows.  If RAISE is zero, F is sent to the back, behind all other
 434      windows.  */
 435   void (*frame_raise_lower_hook) P_ ((struct frame *f, int raise));
 436
 437   \f
 438   /* Scroll bar hooks.  */
 439
 440   /* The representation of scroll bars is determined by the code which
 441      implements them, except for one thing: they must be represented by
 442      lisp objects.  This allows us to place references to them in
 443      Lisp_Windows without worrying about those references becoming
 444      dangling references when the scroll bar is destroyed.
 445
 446      The window-system-independent portion of Emacs just refers to
 447      scroll bars via their windows, and never looks inside the scroll bar
 448      representation; it always uses hook functions to do all the
 449      scroll bar manipulation it needs.
 450
 451      The `vertical_scroll_bar' field of a Lisp_Window refers to that
 452      window's scroll bar, or is nil if the window doesn't have a
 453      scroll bar.
 454
 455      The `scroll_bars' and `condemned_scroll_bars' fields of a Lisp_Frame
 456      are free for use by the scroll bar implementation in any way it sees
 457      fit.  They are marked by the garbage collector.  */
 458
 459
 460   /* Set the vertical scroll bar for WINDOW to have its upper left corner
 461      at (TOP, LEFT), and be LENGTH rows high.  Set its handle to
 462      indicate that we are displaying PORTION characters out of a total
 463      of WHOLE characters, starting at POSITION.  If WINDOW doesn't yet
 464      have a scroll bar, create one for it.  */
 465   void (*set_vertical_scroll_bar_hook) P_ ((struct window *window,
 466                                             int portion, int whole,
 467                                             int position));
 468
 469
 470   /* The following three hooks are used when we're doing a thorough
 471      redisplay of the frame.  We don't explicitly know which scroll bars
 472      are going to be deleted, because keeping track of when windows go
 473      away is a real pain - can you say set-window-configuration?
 474      Instead, we just assert at the beginning of redisplay that *all*
 475      scroll bars are to be removed, and then save scroll bars from the
 476      fiery pit when we actually redisplay their window.  */
 477
 478   /* Arrange for all scroll bars on FRAME to be removed at the next call
 479      to `*judge_scroll_bars_hook'.  A scroll bar may be spared if
 480      `*redeem_scroll_bar_hook' is applied to its window before the judgement.
 481
 482      This should be applied to each frame each time its window tree is
 483      redisplayed, even if it is not displaying scroll bars at the moment;
 484      if the HAS_SCROLL_BARS flag has just been turned off, only calling
 485      this and the judge_scroll_bars_hook will get rid of them.
 486
 487      If non-zero, this hook should be safe to apply to any frame,
 488      whether or not it can support scroll bars, and whether or not it is
 489      currently displaying them.  */
 490   void (*condemn_scroll_bars_hook) P_ ((struct frame *frame));
 491
 492   /* Unmark WINDOW's scroll bar for deletion in this judgement cycle.
 493      Note that it's okay to redeem a scroll bar that is not condemned.  */
 494   void (*redeem_scroll_bar_hook) P_ ((struct window *window));
 495
 496   /* Remove all scroll bars on FRAME that haven't been saved since the
 497      last call to `*condemn_scroll_bars_hook'.
 498
 499      This should be applied to each frame after each time its window
 500      tree is redisplayed, even if it is not displaying scroll bars at the
 501      moment; if the HAS_SCROLL_BARS flag has just been turned off, only
 502      calling this and condemn_scroll_bars_hook will get rid of them.
 503
 504      If non-zero, this hook should be safe to apply to any frame,
 505      whether or not it can support scroll bars, and whether or not it is
 506      currently displaying them.  */
 507   void (*judge_scroll_bars_hook) P_ ((struct frame *FRAME));
 508
 509 \f
 510   /* Called to read input events.
 511
 512      DEVICE indicates which display device to read from.  Input events
 513      should be read into BUF, the size of which is given in SIZE.
 514      EXPECTED is non-zero if the caller suspects that new input is
 515      available.
 516
 517      A positive return value indicates that that many input events
 518      where read into BUF.
 519      Zero means no events were immediately available.
 520      A value of -1 means a transient read error, while -2 indicates
 521      that the device was closed (hangup), and it should be deleted.
 522
 523      XXX Please note that a non-zero value of EXPECTED only means that
 524      there is available input on at least one of the currently opened
 525      display devices -- but not necessarily on this device.
 526      Therefore, in most cases EXPECTED should be simply ignored.
 527
 528      XXX This documentation needs to be updated.  */
 529   int (*read_socket_hook) P_ ((struct device *device,
 530                                int expected,
 531                                struct input_event *hold_quit));
 532
 533   /* Called when a frame's display becomes entirely up to date.  */
 534   void (*frame_up_to_date_hook) P_ ((struct frame *));
 535
 536 \f
 537   /* Called to delete the device-specific portions of a frame that is
 538      on this display device. */
 539   void (*delete_frame_hook) P_ ((struct frame *));
 540
 541   /* Called after the last frame on this device is deleted, or when
 542      the display device was closed (hangup).
 543
 544      If this is NULL, then the generic delete_device is called
 545      instead.  Otherwise the hook must call delete_device itself.
 546
 547      The hook must check for and close any live frames that are still
 548      on the device.  Fdelete_frame ensures that there are no live
 549      frames on the device when it calls this hook, so infinite
 550      recursion is prevented.  */
 551   void (*delete_device_hook) P_ ((struct device *));
 552 };
 553
 554
 555 /* Chain of all display devices currently in use. */
 556 extern struct device *device_list;
 557
 558 #define FRAME_MUST_WRITE_SPACES(f) ((f)->device->must_write_spaces)
 559 #define FRAME_FAST_CLEAR_END_OF_LINE(f) ((f)->device->fast_clear_end_of_line)
 560 #define FRAME_LINE_INS_DEL_OK(f) ((f)->device->line_ins_del_ok)
 561 #define FRAME_CHAR_INS_DEL_OK(f) ((f)->device->char_ins_del_ok)
 562 #define FRAME_SCROLL_REGION_OK(f) ((f)->device->scroll_region_ok)
 563 #define FRAME_SCROLL_REGION_COST(f) ((f)->device->scroll_region_cost)
 564 #define FRAME_MEMORY_BELOW_FRAME(f) ((f)->device->memory_below_frame)
 565
 566 #define FRAME_TERMINAL_CODING(f) ((f)->device->terminal_coding)
 567 #define FRAME_KEYBOARD_CODING(f) ((f)->device->keyboard_coding)
 568
 569 #define DEVICE_TERMINAL_CODING(d) ((d)->terminal_coding)
 570 #define DEVICE_KEYBOARD_CODING(d) ((d)->keyboard_coding)
 571
 572 #define FRAME_RIF(f) ((f)->device->rif)
 573
 574 #define FRAME_DEVICE(f) ((f)->device)
 575
 576 /* FRAME_WINDOW_P tests whether the frame is a window, and is
 577    defined to be the predicate for the window system being used.  */
 578
 579 #ifdef HAVE_X_WINDOWS
 580 #define FRAME_WINDOW_P(f) FRAME_X_P (f)
 581 #endif
 582 #ifdef HAVE_NTGUI
 583 #define FRAME_WINDOW_P(f) FRAME_W32_P (f)
 584 #endif
 585 #ifdef MAC_OS
 586 #define FRAME_WINDOW_P(f) FRAME_MAC_P (f)
 587 #endif
 588 #ifndef FRAME_WINDOW_P
 589 #define FRAME_WINDOW_P(f) (0)
 590 #endif
 591
 592 /* Return true if the display device is not suspended. */
 593 #define DEVICE_ACTIVE_P(d) ((d)->type != output_termcap || (d)->display_info.tty->input)
 594
 595 extern struct device *create_device P_ ((void));
 596 extern void delete_device P_ ((struct device *));
 597
 598 /* The initial display device, created by initial_term_init. */
 599 extern struct device *initial_device;
 600
 601 /* arch-tag: 33a00ecc-52b5-4186-a410-8801ac9f087d
 602    (do not change this comment) */