window.c 168 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1 2
/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
Miles Bader's avatar
Miles Bader committed
3
   Copyright (C) 1985,86,87,93,94,95,96,97,1998,2000 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

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
Jim Blandy's avatar
Jim Blandy committed
9
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18
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
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
21

22
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
23 24
#include "lisp.h"
#include "buffer.h"
25
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
26
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
27 28 29 30 31
#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
Andreas Schwab's avatar
Andreas Schwab committed
32
#include "dispextern.h"
33 34 35
#include "blockinput.h"
#include "intervals.h"

36
#ifdef HAVE_X_WINDOWS
Andreas Schwab's avatar
Andreas Schwab committed
37
#include "xterm.h"
38
#endif	/* HAVE_X_WINDOWS */
Andrew Innes's avatar
Andrew Innes committed
39 40 41
#ifdef WINDOWSNT
#include "w32term.h"
#endif
42 43 44
#ifdef MSDOS
#include "msdos.h"
#endif
45 46 47
#ifdef macintosh
#include "macterm.h"
#endif
48 49 50

#ifndef max
#define max(a, b) ((a) < (b) ? (b) : (a))
Andreas Schwab's avatar
Andreas Schwab committed
51
#endif
Jim Blandy's avatar
Jim Blandy committed
52

53

54
Lisp_Object Qwindowp, Qwindow_live_p, Qwindow_configuration_p;
55
Lisp_Object Qwindow_size_fixed, Qleft_bitmap_area, Qright_bitmap_area;
Gerd Moellmann's avatar
Gerd Moellmann committed
56
extern Lisp_Object Qheight, Qwidth;
Jim Blandy's avatar
Jim Blandy committed
57

Andreas Schwab's avatar
Andreas Schwab committed
58
static struct window *decode_window P_ ((Lisp_Object));
59
static Lisp_Object select_window_1 P_ ((Lisp_Object, int));
60 61 62 63 64
static int count_windows P_ ((struct window *));
static int get_leaf_windows P_ ((struct window *, struct window **, int));
static void window_scroll P_ ((Lisp_Object, int, int, int));
static void window_scroll_pixel_based P_ ((Lisp_Object, int, int, int));
static void window_scroll_line_based P_ ((Lisp_Object, int, int, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
65
static int window_min_size_1 P_ ((struct window *, int));
66
static int window_min_size P_ ((struct window *, int, int, int *));
Gerd Moellmann's avatar
Gerd Moellmann committed
67
static void size_window P_ ((Lisp_Object, int, int, int));
68
static int freeze_window_start P_ ((struct window *, void *));
69
static int window_fixed_size_p P_ ((struct window *, int, int));
70
static void enlarge_window P_ ((Lisp_Object, int, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
71
static Lisp_Object window_list P_ ((void));
72
static int add_window_to_list P_ ((struct window *, void *));
73 74
static int candidate_window_p P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
				   Lisp_Object));
Gerd Moellmann's avatar
Gerd Moellmann committed
75 76 77 78
static Lisp_Object next_window P_ ((Lisp_Object, Lisp_Object,
				    Lisp_Object, int));
static void decode_next_window_args P_ ((Lisp_Object *, Lisp_Object *,
					 Lisp_Object *));
79 80 81
static int foreach_window_1 P_ ((struct window *,
				 int (* fn) (struct window *, void *),
				 void *));
82
static Lisp_Object window_list_1 P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
83

Jim Blandy's avatar
Jim Blandy committed
84 85 86 87 88 89
/* This is the window in which the terminal's cursor should
   be left when nothing is being done with it.  This must
   always be a leaf window, and its buffer is selected by
   the top level editing loop at the end of each command.

   This value is always the same as
Jim Blandy's avatar
Jim Blandy committed
90
   FRAME_SELECTED_WINDOW (selected_frame).  */
Jim Blandy's avatar
Jim Blandy committed
91 92 93

Lisp_Object selected_window;

Gerd Moellmann's avatar
Gerd Moellmann committed
94 95 96 97 98 99
/* A list of all windows for use by next_window and Fwindow_list.
   Functions creating or deleting windows should invalidate this cache
   by setting it to nil.  */

Lisp_Object Vwindow_list;

100 101 102
/* The mini-buffer window of the selected frame.
   Note that you cannot test for mini-bufferness of an arbitrary window
   by comparing against this; but you can test for mini-bufferness of
Jim Blandy's avatar
Jim Blandy committed
103
   the selected window.  */
104

Jim Blandy's avatar
Jim Blandy committed
105 106 107
Lisp_Object minibuf_window;

/* Non-nil means it is the window for C-M-v to scroll
108 109
   when the mini-buffer is selected.  */

Jim Blandy's avatar
Jim Blandy committed
110 111 112
Lisp_Object Vminibuf_scroll_window;

/* Non-nil means this is the buffer whose window C-M-v should scroll.  */
113

Jim Blandy's avatar
Jim Blandy committed
114 115 116
Lisp_Object Vother_window_scroll_buffer;

/* Non-nil means it's function to call to display temp buffers.  */
117

Jim Blandy's avatar
Jim Blandy committed
118 119 120
Lisp_Object Vtemp_buffer_show_function;

/* If a window gets smaller than either of these, it is removed. */
121

Jim Blandy's avatar
Jim Blandy committed
122 123 124 125
int window_min_height;
int window_min_width;

/* Nonzero implies Fdisplay_buffer should create windows. */
126

Jim Blandy's avatar
Jim Blandy committed
127 128
int pop_up_windows;

Jim Blandy's avatar
Jim Blandy committed
129
/* Nonzero implies make new frames for Fdisplay_buffer.  */
130

Jim Blandy's avatar
Jim Blandy committed
131
int pop_up_frames;
Jim Blandy's avatar
Jim Blandy committed
132

133 134 135 136
/* Nonzero means reuse existing frames for displaying buffers.  */

int display_buffer_reuse_frames;

Jim Blandy's avatar
Jim Blandy committed
137
/* Non-nil means use this function instead of default */
138

Jim Blandy's avatar
Jim Blandy committed
139
Lisp_Object Vpop_up_frame_function;
Jim Blandy's avatar
Jim Blandy committed
140 141

/* Function to call to handle Fdisplay_buffer.  */
142

Jim Blandy's avatar
Jim Blandy committed
143 144
Lisp_Object Vdisplay_buffer_function;

145
/* List of buffer *names* for buffers that should have their own frames.  */
146

147 148 149
Lisp_Object Vspecial_display_buffer_names;

/* List of regexps for buffer names that should have their own frames.  */
150

151 152 153
Lisp_Object Vspecial_display_regexps;

/* Function to pop up a special frame.  */
154

155 156
Lisp_Object Vspecial_display_function;

157
/* List of buffer *names* for buffers to appear in selected window.  */
158

159 160 161
Lisp_Object Vsame_window_buffer_names;

/* List of regexps for buffer names to appear in selected window.  */
162

163 164
Lisp_Object Vsame_window_regexps;

165
/* Hook run at end of temp_output_buffer_show.  */
166

167 168
Lisp_Object Qtemp_buffer_show_hook;

169
/* Fdisplay_buffer always splits the largest window
Jim Blandy's avatar
Jim Blandy committed
170
   if that window is more than this high.  */
171

Jim Blandy's avatar
Jim Blandy committed
172 173 174
int split_height_threshold;

/* Number of lines of continuity in scrolling by screenfuls.  */
175

Jim Blandy's avatar
Jim Blandy committed
176 177 178
int next_screen_context_lines;

/* Incremented for each window created.  */
179

Jim Blandy's avatar
Jim Blandy committed
180 181
static int sequence_number;

182
/* Nonzero after init_window_once has finished.  */
183

184 185
static int window_initialized;

186
/* Hook to run when window config changes.  */
187

188 189 190
Lisp_Object Qwindow_configuration_change_hook;
Lisp_Object Vwindow_configuration_change_hook;

191 192 193
/* Nonzero means scroll commands try to put point
   at the same screen height as previously.  */

194 195 196
Lisp_Object Vscroll_preserve_screen_position;

#if 0 /* This isn't used anywhere.  */
197
/* Nonzero means we can split a frame even if it is "unsplittable".  */
198
static int inhibit_frame_unsplittable;
199
#endif /* 0 */
200

Jim Blandy's avatar
Jim Blandy committed
201
#define min(a, b) ((a) < (b) ? (a) : (b))
202

203 204
extern int scroll_margin;

205
extern Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
Jim Blandy's avatar
Jim Blandy committed
206 207

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
208 209 210
  "Returns t if OBJECT is a window.")
  (object)
     Lisp_Object object;
Jim Blandy's avatar
Jim Blandy committed
211
{
212
  return WINDOWP (object) ? Qt : Qnil;
Jim Blandy's avatar
Jim Blandy committed
213 214
}

215
DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
216 217 218
  "Returns t if OBJECT is a window which is currently visible.")
     (object)
     Lisp_Object object;
219
{
220
  return (WINDOWP (object) && ! NILP (XWINDOW (object)->buffer) ? Qt : Qnil);
221 222
}

Jim Blandy's avatar
Jim Blandy committed
223 224 225
Lisp_Object
make_window ()
{
226
  Lisp_Object val;
Jim Blandy's avatar
Jim Blandy committed
227
  register struct window *p;
228 229 230 231 232 233 234
  register struct Lisp_Vector *vec;
  int i;

  vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct window));
  for (i = 0; i < VECSIZE (struct window); i++)
    vec->contents[i] = Qnil;
  vec->size = VECSIZE (struct window);
235
  p = (struct window *) vec;
236 237 238 239 240 241
  XSETFASTINT (p->sequence_number, ++sequence_number);
  XSETFASTINT (p->left, 0);
  XSETFASTINT (p->top, 0);
  XSETFASTINT (p->height, 0);
  XSETFASTINT (p->width, 0);
  XSETFASTINT (p->hscroll, 0);
242
  p->orig_top = p->orig_height = Qnil;
Jim Blandy's avatar
Jim Blandy committed
243 244
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
245
  XSETFASTINT (p->use_time, 0);
Jim Blandy's avatar
Jim Blandy committed
246
  p->frame = Qnil;
Jim Blandy's avatar
Jim Blandy committed
247 248
  p->display_table = Qnil;
  p->dedicated = Qnil;
249 250 251 252 253 254 255 256 257 258 259
  p->pseudo_window_p = 0;
  bzero (&p->cursor, sizeof (p->cursor));
  bzero (&p->last_cursor, sizeof (p->last_cursor));
  bzero (&p->phys_cursor, sizeof (p->phys_cursor));
  p->desired_matrix = p->current_matrix = 0;
  p->phys_cursor_type = -1;
  p->must_be_updated_p = 0;
  XSETFASTINT (p->window_end_vpos, 0);
  XSETFASTINT (p->window_end_pos, 0);
  p->window_end_valid = Qnil;
  p->vscroll = 0;
260
  XSETWINDOW (val, p);
261
  XSETFASTINT (p->last_point, 0);
262
  p->frozen_window_start_p = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
263 264

  Vwindow_list = Qnil;
Jim Blandy's avatar
Jim Blandy committed
265 266 267 268 269 270 271 272 273 274
  return val;
}

DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
  "Return the window that the cursor now appears in and commands apply to.")
  ()
{
  return selected_window;
}

275 276 277 278 279 280
DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
  "Return the window used now for minibuffers.\n\
If the optional argument FRAME is specified, return the minibuffer window\n\
used by that frame.")
  (frame)
    Lisp_Object frame;
Jim Blandy's avatar
Jim Blandy committed
281
{
282
  if (NILP (frame))
283 284
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 0);
285
  return FRAME_MINIBUF_WINDOW (XFRAME (frame));
Jim Blandy's avatar
Jim Blandy committed
286 287
}

288
DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
289 290 291 292 293
  "Returns non-nil if WINDOW is a minibuffer window.")
  (window)
     Lisp_Object window;
{
  struct window *w = decode_window (window);
294
  return MINI_WINDOW_P (w) ? Qt : Qnil;
Miles Bader's avatar
Miles Bader committed
295 296 297
}


Jim Blandy's avatar
Jim Blandy committed
298
DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
Miles Bader's avatar
Miles Bader committed
299
  Spos_visible_in_window_p, 0, 3, 0,
Jim Blandy's avatar
Jim Blandy committed
300
  "Return t if position POS is currently on the frame in WINDOW.\n\
301
Return nil if that position is scrolled vertically out of view.\n\
Miles Bader's avatar
Miles Bader committed
302
If FULLY is non-nil, then only return t when POS is completely visible.\n\
Miles Bader's avatar
Miles Bader committed
303
POS defaults to point in WINDOW; WINDOW defaults to the selected window.")
Miles Bader's avatar
Miles Bader committed
304 305
  (pos, window, fully)
     Lisp_Object pos, window, fully;
Jim Blandy's avatar
Jim Blandy committed
306 307 308 309
{
  register struct window *w;
  register int posint;
  register struct buffer *buf;
310 311
  struct text_pos top;
  Lisp_Object in_window;
312
  int fully_p;
Jim Blandy's avatar
Jim Blandy committed
313

Miles Bader's avatar
Miles Bader committed
314 315 316 317 318
  w = decode_window (window);
  buf = XBUFFER (w->buffer);
  SET_TEXT_POS_FROM_MARKER (top, w->start);

  if (!NILP (pos))
Jim Blandy's avatar
Jim Blandy committed
319 320 321 322
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }
Miles Bader's avatar
Miles Bader committed
323 324 325 326
  else if (w == XWINDOW (selected_window))
    posint = PT;
  else
    posint = XMARKER (w->pointm)->charpos;
Jim Blandy's avatar
Jim Blandy committed
327

328
  /* If position is above window start, it's not visible.  */
329
  if (posint < CHARPOS (top))
330 331
    in_window = Qnil;
  else if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf)
Miles Bader's avatar
Miles Bader committed
332 333 334
	   && XFASTINT (w->last_overlay_modified) >= BUF_OVERLAY_MODIFF (buf)
	   && posint < BUF_Z (buf) - XFASTINT (w->window_end_pos))
    {
335 336 337 338 339 340
      /* If frame is up-to-date, and POSINT is < window end pos, use
	 that info.  This doesn't work for POSINT == end pos, because
	 the window end pos is actually the position _after_ the last
	 char in the window.  */
      if (!NILP (fully))
	{
341
	  pos_visible_p (w, posint, &fully_p, !NILP (fully));
342 343
	  in_window = fully_p ? Qt : Qnil;
	}
Miles Bader's avatar
Miles Bader committed
344
      else
345
	in_window = Qt;
Miles Bader's avatar
Miles Bader committed
346
    }
347 348 349 350 351
  else if (posint > BUF_ZV (buf))
    in_window = Qnil;
  else if (CHARPOS (top) < BUF_BEGV (buf) || CHARPOS (top) > BUF_ZV (buf))
    /* If window start is out of range, do something reasonable.  */
    in_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
352 353
  else
    {
354
      if (pos_visible_p (w, posint, &fully_p, !NILP (fully)))
355
	in_window = NILP (fully) || fully_p ? Qt : Qnil;
Miles Bader's avatar
Miles Bader committed
356 357
      else
	in_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
358
    }
359 360

  return in_window;
Jim Blandy's avatar
Jim Blandy committed
361
}
362

Jim Blandy's avatar
Jim Blandy committed
363 364 365 366 367

static struct window *
decode_window (window)
     register Lisp_Object window;
{
Jim Blandy's avatar
Jim Blandy committed
368
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
369 370
    return XWINDOW (selected_window);

371
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
  return XWINDOW (window);
}

DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
  "Return the buffer that WINDOW is displaying.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
  "Return the number of lines in WINDOW (including its mode line).")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->height;
}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
392 393 394 395
  "Return the number of display columns in WINDOW.\n\
This is the width that is usable columns available for text in WINDOW.\n\
If you want to find out how many columns WINDOW takes up,\n\
use  (let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))).")
Jim Blandy's avatar
Jim Blandy committed
396 397 398
  (window)
     Lisp_Object window;
{
399
  return make_number (window_internal_width (decode_window (window)));
Jim Blandy's avatar
Jim Blandy committed
400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418
}

DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
  "Return the number of columns by which WINDOW is scrolled from left margin.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->hscroll;
}

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
  "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
NCOL should be zero or positive.")
  (window, ncol)
     register Lisp_Object window, ncol;
{
  register struct window *w;

  CHECK_NUMBER (ncol, 1);
419
  if (XINT (ncol) < 0) XSETFASTINT (ncol, 0);
Jim Blandy's avatar
Jim Blandy committed
420
  w = decode_window (window);
421
  if (XINT (w->hscroll) != XINT (ncol))
Gerd Moellmann's avatar
Gerd Moellmann committed
422 423
    /* Prevent redisplay shortcuts */
    XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
Jim Blandy's avatar
Jim Blandy committed
424 425 426 427
  w->hscroll = ncol;
  return ncol;
}

428 429 430 431 432 433 434 435 436 437 438 439 440 441
DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
       Swindow_redisplay_end_trigger, 0, 1, 0,
  "Return WINDOW's redisplay end trigger value.\n\
See `set-window-redisplay-end-trigger' for more information.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->redisplay_end_trigger;
}

DEFUN ("set-window-redisplay-end-trigger", Fset_window_redisplay_end_trigger,
       Sset_window_redisplay_end_trigger, 2, 2, 0,
  "Set WINDOW's redisplay end trigger value to VALUE.\n\
VALUE should be a buffer position (typically a marker) or nil.\n\
442 443 444 445
If it is a buffer position, then if redisplay in WINDOW reaches a position\n\
beyond VALUE, the functions in `redisplay-end-trigger-functions' are called\n\
with two arguments: WINDOW, and the end trigger value.\n\
Afterwards the end-trigger value is reset to nil.")
446 447 448 449 450 451 452 453 454 455
  (window, value)
     register Lisp_Object window, value;
{
  register struct window *w;

  w = decode_window (window);
  w->redisplay_end_trigger = value;
  return value;
}

Jim Blandy's avatar
Jim Blandy committed
456 457
DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
  "Return a list of the edge coordinates of WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
458
\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
Jim Blandy's avatar
Jim Blandy committed
459 460 461 462 463 464 465 466 467
RIGHT is one more than the rightmost column used by WINDOW,\n\
and BOTTOM is one more than the bottommost row used by WINDOW\n\
 and its mode-line.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  return Fcons (w->left, Fcons (w->top,
468
           Fcons (make_number (WINDOW_RIGHT_EDGE (w)),
Jim Blandy's avatar
Jim Blandy committed
469 470 471 472 473
		  Fcons (make_number (XFASTINT (w->top)
				      + XFASTINT (w->height)),
			 Qnil))));
}

474
/* Test if the character at column *X, row *Y is within window W.
Jim Blandy's avatar
Jim Blandy committed
475 476 477 478 479 480 481
   If it is not, return 0;
   if it is in the window's text area,
      set *x and *y to its location relative to the upper left corner
         of the window, and
      return 1;
   if it is on the window's modeline, return 2;
   if it is on the border between the window and its right sibling,
482 483
      return 3.
   if it is on the window's top line, return 4;
484 485
   if it is in the bitmap area to the left/right of the window,
   return 5 or 6, and convert *X and *Y to window-relative corrdinates.
486 487 488

   X and Y are frame relative pixel coordinates.  */

Jim Blandy's avatar
Jim Blandy committed
489 490 491 492 493
static int
coordinates_in_window (w, x, y)
     register struct window *w;
     register int *x, *y;
{
494 495
  struct frame *f = XFRAME (WINDOW_FRAME (w));
  int left_x, right_x, top_y, bottom_y;
Gerd Moellmann's avatar
Gerd Moellmann committed
496
  int flags_area_width = FRAME_LEFT_FLAGS_AREA_WIDTH (f);
Jim Blandy's avatar
Jim Blandy committed
497

498 499
  /* In what's below, we subtract 1 when computing right_x because we
     want the rightmost pixel, which is given by left_pixel+width-1.  */
500 501 502
  if (w->pseudo_window_p)
    {
      left_x = 0;
503
      right_x = XFASTINT (w->width) * CANON_Y_UNIT (f) - 1;
504 505 506 507 508
      top_y = WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w);
      bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
    }
  else
    {
509
      left_x = (WINDOW_DISPLAY_LEFT_EDGE_PIXEL_X (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
510
		- FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
511
      right_x = WINDOW_DISPLAY_RIGHT_EDGE_PIXEL_X (w) - 1;
512
      top_y = (WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
513
	       - FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
514 515
      bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
    }
516

517 518 519 520 521 522 523 524 525 526 527 528 529
  if (*y < top_y
      || *y >= bottom_y
      || *x < (left_x
	       - flags_area_width
	       - (FRAME_LEFT_SCROLL_BAR_WIDTH (f)
		  * CANON_X_UNIT (f)))
      || *x > right_x + flags_area_width)
    /* Completely outside anything interesting.  */
    return 0;
  else if (WINDOW_WANTS_MODELINE_P (w)
	   && *y >= bottom_y - CURRENT_MODE_LINE_HEIGHT (w))
    /* On the mode line.  */
    return 2;
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
530 531
  else if (WINDOW_WANTS_HEADER_LINE_P (w)
	   && *y < top_y + CURRENT_HEADER_LINE_HEIGHT (w))
532 533
    /* On the top line.  */
    return 4;
534 535 536
  /* Need to say "*x > right_x" rather than >=, since on character
     terminals, the vertical line's x coordinate is right_x.  */
  else if (*x < left_x || *x > right_x)
537 538 539 540 541 542 543 544 545
    {
      /* Other lines than the mode line don't include flags areas and
	 scroll bars on the left.  */
      
      /* Convert X and Y to window-relative pixel coordinates.  */
      *x -= left_x;
      *y -= top_y;
      return *x < left_x ? 5 : 6;
    }
546
  /* Here, too, "*x > right_x" is because of character terminals.  */
547 548
  else if (!w->pseudo_window_p
	   && !WINDOW_RIGHTMOST_P (w)
549
	   && *x > right_x - CANON_X_UNIT (f))
550 551 552 553 554 555 556 557 558 559
    /* On the border on the right side of the window?  Assume that
       this area begins at RIGHT_X minus a canonical char width.  */
    return 3;
  else
    {
      /* Convert X and Y to window-relative pixel coordinates.  */
      *x -= left_x;
      *y -= top_y;
      return 1;
    }
Jim Blandy's avatar
Jim Blandy committed
560 561 562 563 564
}

DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
  Scoordinates_in_window_p, 2, 2, 0,
  "Return non-nil if COORDINATES are in WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
565
COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
Jim Blandy's avatar
Jim Blandy committed
566
measured in characters from the upper-left corner of the frame.\n\
Jim Blandy's avatar
Jim Blandy committed
567
(0 .  0) denotes the character in the upper left corner of the\n\
Jim Blandy's avatar
Jim Blandy committed
568
frame.\n\
Jim Blandy's avatar
Jim Blandy committed
569 570
If COORDINATES are in the text portion of WINDOW,\n\
   the coordinates relative to the window are returned.\n\
Jim Blandy's avatar
Jim Blandy committed
571
If they are in the mode line of WINDOW, `mode-line' is returned.\n\
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
572
If they are in the top mode line of WINDOW, `header-line' is returned.\n\
573 574 575
If they are in the bitmap-area to the left of the window,\n\
   `left-bitmap-area' is returned, if they are in the area on the right of\n\
   the window, `right-bitmap-area' is returned.\n\
Jim Blandy's avatar
Jim Blandy committed
576
If they are on the border between WINDOW and its right sibling,\n\
Jim Blandy's avatar
Jim Blandy committed
577
   `vertical-line' is returned.")
Jim Blandy's avatar
Jim Blandy committed
578 579 580
  (coordinates, window)
     register Lisp_Object coordinates, window;
{
581 582
  struct window *w;
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
583
  int x, y;
584
  Lisp_Object lx, ly;
Jim Blandy's avatar
Jim Blandy committed
585

586
  CHECK_LIVE_WINDOW (window, 0);
587 588
  w = XWINDOW (window);
  f = XFRAME (w->frame);
Jim Blandy's avatar
Jim Blandy committed
589
  CHECK_CONS (coordinates, 1);
590 591 592 593 594 595 596 597
  lx = Fcar (coordinates);
  ly = Fcdr (coordinates);
  CHECK_NUMBER_OR_FLOAT (lx, 1);
  CHECK_NUMBER_OR_FLOAT (ly, 1);
  x = PIXEL_X_FROM_CANON_X (f, lx);
  y = PIXEL_Y_FROM_CANON_Y (f, ly);

  switch (coordinates_in_window (w, &x, &y))
Jim Blandy's avatar
Jim Blandy committed
598 599 600 601 602
    {
    case 0:			/* NOT in window at all. */
      return Qnil;

    case 1:			/* In text part of window. */
603 604 605 606 607
      /* X and Y are now window relative pixel coordinates.
	 Convert them to canonical char units before returning
	 them.  */
      return Fcons (CANON_X_FROM_PIXEL_X (f, x), 
		    CANON_Y_FROM_PIXEL_Y (f, y));
Jim Blandy's avatar
Jim Blandy committed
608 609 610

    case 2:			/* In mode line of window. */
      return Qmode_line;
611

Jim Blandy's avatar
Jim Blandy committed
612
    case 3:			/* On right border of window.  */
Jim Blandy's avatar
Jim Blandy committed
613
      return Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
614

615
    case 4:
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
616
      return Qheader_line;
617

618 619 620 621 622 623
    case 5:
      return Qleft_bitmap_area;
      
    case 6:
      return Qright_bitmap_area;

Jim Blandy's avatar
Jim Blandy committed
624 625 626 627 628
    default:
      abort ();
    }
}

Gerd Moellmann's avatar
Gerd Moellmann committed
629 630

/* Callback for foreach_window, used in window_from_coordinates.
631 632 633 634 635
   Check if window W contains coordinates specified by USER_DATA which
   is actually a pointer to a struct check_window_data CW.

   Check if window W contains coordinates *CW->x and *CW->y.  If it
   does, return W in *CW->window, as Lisp_Object, and return in
Dave Love's avatar
Dave Love committed
636
   *CW->part the part of the window under coordinates *X,*Y.  Return
637 638 639 640 641 642 643
   zero from this function to stop iterating over windows.  */

struct check_window_data
{
  Lisp_Object *window;
  int *x, *y, *part;
};
Gerd Moellmann's avatar
Gerd Moellmann committed
644 645

static int
646
check_window_containing (w, user_data)
Gerd Moellmann's avatar
Gerd Moellmann committed
647
     struct window *w;
648
     void *user_data;
Gerd Moellmann's avatar
Gerd Moellmann committed
649
{
650
  struct check_window_data *cw = (struct check_window_data *) user_data;
Gerd Moellmann's avatar
Gerd Moellmann committed
651 652
  int found;

653
  found = coordinates_in_window (w, cw->x, cw->y);
Gerd Moellmann's avatar
Gerd Moellmann committed
654 655
  if (found)
    {
656 657
      *cw->part = found - 1;
      XSETWINDOW (*cw->window, w);
Gerd Moellmann's avatar
Gerd Moellmann committed
658 659 660 661 662 663
    }
  
  return !found;
}


664 665 666 667 668
/* Find the window containing frame-relative pixel position X/Y and
   return it as a Lisp_Object.  If X, Y is on the window's modeline,
   set *PART to 1; if it is on the separating line between the window
   and its right sibling, set it to 2; otherwise set it to 0.  If
   there is no window under X, Y return nil and leave *PART
Gerd Moellmann's avatar
Gerd Moellmann committed
669 670 671 672 673 674 675 676 677 678
   unmodified.  TOOL_BAR_P non-zero means detect tool-bar windows.

   This function was previously implemented with a loop cycling over
   windows with Fnext_window, and starting with the frame's selected
   window.  It turned out that this doesn't work with an
   implementation of next_window using Vwindow_list, because
   FRAME_SELECTED_WINDOW (F) is not always contained in the window
   tree of F when this function is called asynchronously from
   note_mouse_highlight.  The original loop didn't terminate in this
   case.  */
679

Jim Blandy's avatar
Jim Blandy committed
680
Lisp_Object
Gerd Moellmann's avatar
Gerd Moellmann committed
681 682
window_from_coordinates (f, x, y, part, tool_bar_p)
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
683
     int x, y;
Jim Blandy's avatar
Jim Blandy committed
684
     int *part;
685
     int tool_bar_p;
Jim Blandy's avatar
Jim Blandy committed
686
{
Gerd Moellmann's avatar
Gerd Moellmann committed
687
  Lisp_Object window;
688
  struct check_window_data cw;
689

Gerd Moellmann's avatar
Gerd Moellmann committed
690
  window = Qnil;
691 692
  cw.window = &window, cw.x = &x, cw.y = &y; cw.part = part;
  foreach_window (f, check_window_containing, &cw);
Gerd Moellmann's avatar
Gerd Moellmann committed
693 694 695 696 697 698 699 700
  
  /* If not found above, see if it's in the tool bar window, if a tool
     bar exists.  */
  if (NILP (window)
      && tool_bar_p
      && WINDOWP (f->tool_bar_window)
      && XINT (XWINDOW (f->tool_bar_window)->height) > 0
      && coordinates_in_window (XWINDOW (f->tool_bar_window), &x, &y))
701 702
    {
      *part = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
703
      window = f->tool_bar_window;
704
    }
705

Gerd Moellmann's avatar
Gerd Moellmann committed
706
  return window;
Jim Blandy's avatar
Jim Blandy committed
707 708
}

709
DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
Richard M. Stallman's avatar
Richard M. Stallman committed
710
  "Return window containing coordinates X and Y on FRAME.\n\
Jim Blandy's avatar
Jim Blandy committed
711 712
If omitted, FRAME defaults to the currently selected frame.\n\
The top left corner of the frame is considered to be row 0,\n\
Jim Blandy's avatar
Jim Blandy committed
713
column 0.")
Richard M. Stallman's avatar
Richard M. Stallman committed
714 715
  (x, y, frame)
      Lisp_Object x, y, frame;
Jim Blandy's avatar
Jim Blandy committed
716 717
{
  int part;
718
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
719

Jim Blandy's avatar
Jim Blandy committed
720
  if (NILP (frame))
721 722
    frame = selected_frame;
  CHECK_LIVE_FRAME (frame, 2);
723
  f = XFRAME (frame);
Jim Blandy's avatar
Jim Blandy committed
724

725 726 727 728 729 730 731 732
  /* Check that arguments are integers or floats.  */
  CHECK_NUMBER_OR_FLOAT (x, 0);
  CHECK_NUMBER_OR_FLOAT (y, 1);

  return window_from_coordinates (f, 
				  PIXEL_X_FROM_CANON_X (f, x),
				  PIXEL_Y_FROM_CANON_Y (f, y),
				  &part, 0);
Jim Blandy's avatar
Jim Blandy committed
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
}

DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
  "Return current value of point in WINDOW.\n\
For a nonselected window, this is the value point would have\n\
if that window were selected.\n\
\n\
Note that, when WINDOW is the selected window and its buffer\n\
is also currently selected, the value returned is the same as (point).\n\
It would be more strictly correct to return the `top-level' value\n\
of point, outside of any save-excursion forms.\n\
But that is hard to define.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  if (w == XWINDOW (selected_window)
      && current_buffer == XBUFFER (w->buffer))
    return Fpoint ();
  return Fmarker_position (w->pointm);
}

DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
757 758
  "Return position at which display currently starts in WINDOW.\n\
This is updated by redisplay or by calling `set-window-start'.")
Jim Blandy's avatar
Jim Blandy committed
759 760 761 762 763 764
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

765 766
/* This is text temporarily removed from the doc string below.

767 768 769 770 771 772 773
This function returns nil if the position is not currently known.\n\
That happens when redisplay is preempted and doesn't finish.\n\
If in that case you want to compute where the end of the window would\n\
have been if redisplay had finished, do this:\n\
    (save-excursion\n\
      (goto-char (window-start window))\n\
      (vertical-motion (1- (window-height window)) window)\n\
774 775
      (point))")  */

776
DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 2, 0,
777 778 779
  "Return position at which display currently ends in WINDOW.\n\
This is updated by redisplay, when it runs to completion.\n\
Simply changing the buffer text or setting `window-start'\n\
780 781 782 783 784
does not update this value.\n\
If UP-TO-DATE is non-nil, compute the up-to-date position\n\
if it isn't already recorded.")
  (window, update)
     Lisp_Object window, update;
Jim Blandy's avatar
Jim Blandy committed
785 786 787
{
  Lisp_Object value;
  struct window *w = decode_window (window);
788 789 790 791 792
  Lisp_Object buf;

  buf = w->buffer;
  CHECK_BUFFER (buf, 0);

793
#if 0 /* This change broke some things.  We should make it later.  */
794 795 796 797 798 799
  /* If we don't know the end position, return nil.
     The user can compute it with vertical-motion if he wants to.
     It would be nicer to do it automatically,
     but that's so slow that it would probably bother people.  */
  if (NILP (w->window_end_valid))
    return Qnil;
800
#endif
801

802 803 804 805
  if (! NILP (update)
      && ! (! NILP (w->window_end_valid)
	    && XFASTINT (w->last_modified) >= MODIFF))
    {
806 807
      struct text_pos startp;
      struct it it;
808 809 810 811 812

      /* In case W->start is out of the range, use something
         reasonable.  This situation occured when loading a file with
         `-l' containing a call to `rmail' with subsequent other
         commands.  At the end, W->start happened to be BEG, while
813
         rmail had already narrowed the buffer.  */
814
      if (XMARKER (w->start)->charpos < BEGV)
815
	SET_TEXT_POS (startp, BEGV, BEGV_BYTE);
816
      else if (XMARKER (w->start)->charpos > ZV)
817
	SET_TEXT_POS (startp, ZV, ZV_BYTE);
818
      else
819 820 821 822 823 824 825
	SET_TEXT_POS_FROM_MARKER (startp, w->start);

      /* Cannot use Fvertical_motion because that function doesn't
	 cope with variable-height lines.  */
      start_display (&it, w, startp);
      move_it_vertically (&it, window_box_height (w));
      value = make_number (IT_CHARPOS (it));
826 827
    }
  else
828
    XSETINT (value, BUF_Z (XBUFFER (buf)) - XFASTINT (w->window_end_pos));
Jim Blandy's avatar
Jim Blandy committed
829 830 831 832 833 834 835 836 837 838 839 840

  return value;
}

DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
  "Make point value in WINDOW be at position POS in WINDOW's buffer.")
  (window, pos)
     Lisp_Object window, pos;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
841 842
  if (w == XWINDOW (selected_window)
      && XBUFFER (w->buffer) == current_buffer)
Jim Blandy's avatar
Jim Blandy committed
843 844 845
    Fgoto_char (pos);
  else
    set_marker_restricted (w->pointm, pos, w->buffer);
846
  
Jim Blandy's avatar
Jim Blandy committed
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
  return pos;
}

DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
  "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
Optional third arg NOFORCE non-nil inhibits next redisplay\n\
from overriding motion of point in order to display at this exact start.")
  (window, pos, noforce)
     Lisp_Object window, pos, noforce;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  set_marker_restricted (w->start, pos, w->buffer);
  /* this is not right, but much easier than doing what is right. */
  w->start_at_line_beg = Qnil;
Jim Blandy's avatar
Jim Blandy committed
863
  if (NILP (noforce))
Jim Blandy's avatar
Jim Blandy committed
864 865
    w->force_start = Qt;
  w->update_mode_line = Qt;
866
  XSETFASTINT (w->last_modified, 0);
867
  XSETFASTINT (w->last_overlay_modified, 0);
Jim Blandy's avatar
Jim Blandy committed
868 869
  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
870

Jim Blandy's avatar
Jim Blandy committed
871 872 873 874 875 876
  return pos;
}

DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
       1, 1, 0,
  "Return WINDOW's dedicated object, usually t or nil.\n\
877
See also `set-window-dedicated-p'.")
Jim Blandy's avatar
Jim Blandy committed
878 879 880 881 882 883
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

884 885 886 887 888 889 890
DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
       Sset_window_dedicated_p, 2, 2, 0,
  "Control whether WINDOW is dedicated to the buffer it displays.\n\
If it is dedicated, Emacs will not automatically change\n\
which buffer appears in it.\n\
The second argument is the new value for the dedication flag;\n\
non-nil means yes.")
Jim Blandy's avatar
Jim Blandy committed
891 892 893 894 895
  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

Jim Blandy's avatar
Jim Blandy committed
896
  if (NILP (arg))
Jim Blandy's avatar
Jim Blandy committed
897 898
    w->dedicated = Qnil;
  else
899
    w->dedicated = Qt;
Jim Blandy's avatar
Jim Blandy committed
900 901 902 903 904 905 906 907 908 909 910 911 912

  return w->dedicated;
}

DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
       0, 1, 0,
  "Return the display-table that WINDOW is using.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->display_table;
}

913 914 915 916
/* Get the display table for use on window W.  This is either W's
   display table or W's buffer's display table.  Ignore the specified
   tables if they are not valid; if no valid table is specified,
   return 0.  */
Jim Blandy's avatar
Jim Blandy committed
917

918
struct Lisp_Char_Table *
Jim Blandy's avatar
Jim Blandy committed
919 920 921
window_display_table (w)
     struct window *w;
{
922 923 924 925 926 927 928 929 930 931 932 933 934
  struct Lisp_Char_Table *dp = NULL;

  if (DISP_TABLE_P (w->display_table))
    dp = XCHAR_TABLE (w->display_table);
  else if (BUFFERP (w->buffer))
    {
      struct buffer *b = XBUFFER (w->buffer);
      
      if (DISP_TABLE_P (b->display_table))
	dp = XCHAR_TABLE (b->display_table);
      else if (DISP_TABLE_P (Vstandard_display_table))
	dp = XCHAR_TABLE (Vstandard_display_table);
    }
935

936
  return dp;
Jim Blandy's avatar
Jim Blandy committed
937 938
}

Jim Blandy's avatar
Jim Blandy committed
939
DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
940 941 942 943 944 945 946 947 948 949 950 951 952
  "Set WINDOW's display-table to TABLE.")
  (window, table)
     register Lisp_Object window, table;
{
  register struct window *w;

  w = decode_window (window);
  w->display_table = table;
  return table;
}

/* Record info on buffer window w is displaying
   when it is about to cease to display that buffer.  */
Andreas Schwab's avatar
Andreas Schwab committed
953
static void
Jim Blandy's avatar
Jim Blandy committed
954 955 956
unshow_buffer (w)
     register struct window *w;
{
957
  Lisp_Object buf;
958
  struct buffer *b;
Jim Blandy's avatar
Jim Blandy committed
959

960
  buf = w->buffer;
961 962
  b = XBUFFER (buf);
  if (b != XMARKER (w->pointm)->buffer)
Jim Blandy's avatar
Jim Blandy committed
963 964
    abort ();

965
#if 0
Jim Blandy's avatar
Jim Blandy committed
966 967 968 969
  if (w == XWINDOW (selected_window)
      || ! EQ (buf, XWINDOW (selected_window)->buffer))
    /* Do this except when the selected window's buffer
       is being removed from some other window.  */
970 971 972 973 974 975 976 977
#endif
    /* last_window_start records the start position that this buffer
       had in the last window to be disconnected from it.
       Now that this statement is unconditional,
       it is possible for the buffer to be displayed in the
       selected window, while last_window_start reflects another
       window which was recently showing the same buffer.
       Some people might say that might be a good thing.  Let's see.  */
978
    b->last_window_start = marker_position (w->start);
Jim Blandy's avatar
Jim Blandy committed
979 980 981 982

  /* Point in the selected window's buffer
     is actually stored in that buffer, and the window's pointm isn't used.
     So don't clobber point in that buffer.  */
983 984
  if (! EQ (buf, XWINDOW (selected_window)->buffer)
      /* This line helps to fix Horsley's testbug.el bug.  */
985 986
      && !(WINDOWP (b->last_selected_window)
	   && w != XWINDOW (b->last_selected_window)
987
	   && EQ (buf, XWINDOW (b->last_selected_window)->buffer)))
988 989 990 991 992 993 994
    temp_set_point_both (b,
			 clip_to_bounds (BUF_BEGV (b),
					 XMARKER (w->pointm)->charpos,
					 BUF_ZV (b)),
			 clip_to_bounds (BUF_BEGV_BYTE (b),
					 marker_byte_position (w->pointm),
					 BUF_ZV_BYTE (b)));
995
  
996 997
  if (WINDOWP (b->last_selected_window)
      && w == XWINDOW (b->last_selected_window))
998
    b->last_selected_window = Qnil;
Jim Blandy's avatar
Jim Blandy committed
999 1000 1001
}

/* Put replacement into the window structure in place of old. */
Andreas Schwab's avatar
Andreas Schwab committed
1002
static void
Jim Blandy's avatar
Jim Blandy committed
1003 1004 1005 1006 1007 1008
replace_window (old, replacement)
     Lisp_Object old, replacement;
{
  register Lisp_Object tem;
  register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);

Jim Blandy's avatar
Jim Blandy committed
1009 1010
  /* If OLD is its frame's root_window, then replacement is the new
     root_window for that frame.  */
Jim Blandy's avatar
Jim Blandy committed
1011

1012
  if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
Jim Blandy's avatar
Jim Blandy committed
1013
    FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
Jim Blandy's avatar
Jim Blandy committed
1014 1015 1016 1017 1018

  p->left = o->left;
  p->top = o->top;
  p->width = o->width;
  p->height = o->height;
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
  p->desired_matrix = p->current_matrix = 0;
  p->vscroll = 0;
  bzero (&p->cursor, sizeof (p->cursor));
  bzero (&p->last_cursor, sizeof (p->last_cursor));
  bzero (&p->phys_cursor, sizeof (p->phys_cursor));
  p->phys_cursor_type = -1;
  p->must_be_updated_p = 0;
  p->pseudo_window_p = 0;
  XSETFASTINT (p->window_end_vpos, 0);
  XSETFASTINT (p->window_end_pos, 0);
  p->window_end_valid = Qnil;
1030
  p->frozen_window_start_p = 0;
1031
  p->orig_top = p->orig_height = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1032 1033

  p->next = tem = o->next;
Jim Blandy's avatar
Jim Blandy committed
1034
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1035 1036 1037
    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
Jim Blandy's avatar
Jim Blandy committed
1038
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1039 1040 1041
    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;