dispnew.c 59.7 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Updating of data structures for redisplay.
2 3
   Copyright (C) 1985, 1986, 1987, 1988, 1990, 
   1992, 1993 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
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 19 20 21 22 23 24 25 26 27 28 29
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.  */


#include <signal.h>

#include "config.h"
#include <stdio.h>
#include <ctype.h>

#include "termchar.h"
#include "termopts.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
30
#include "termhooks.h"
Jim Blandy's avatar
Jim Blandy committed
31 32 33 34
#include "cm.h"
#include "lisp.h"
#include "dispextern.h"
#include "buffer.h"
Jim Blandy's avatar
Jim Blandy committed
35
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
36 37 38 39 40
#include "window.h"
#include "commands.h"
#include "disptab.h"
#include "indent.h"

41
#include "systty.h"
Jim Blandy's avatar
Jim Blandy committed
42 43
#include "systime.h"

Jim Blandy's avatar
Jim Blandy committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif	/* HAVE_X_WINDOWS */

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

#ifndef PENDING_OUTPUT_COUNT
/* Get number of chars of output now in the buffer of a stdio stream.
   This ought to be built in in stdio, but it isn't.
   Some s- files override this because their stdio internals differ.  */
#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base)
#endif

Jim Blandy's avatar
Jim Blandy committed
58
/* Nonzero upon entry to redisplay means do not assume anything about
Jim Blandy's avatar
Jim Blandy committed
59
   current contents of actual terminal frame; clear and redraw it.  */
Jim Blandy's avatar
Jim Blandy committed
60

Jim Blandy's avatar
Jim Blandy committed
61
int frame_garbaged;
Jim Blandy's avatar
Jim Blandy committed
62 63 64 65 66 67 68 69 70 71

/* Nonzero means last display completed.  Zero means it was preempted. */

int display_completed;

/* Lisp variable visible-bell; enables use of screen-flash
   instead of audible bell.  */

int visible_bell;

Jim Blandy's avatar
Jim Blandy committed
72
/* Invert the color of the whole frame, at a low level.  */
Jim Blandy's avatar
Jim Blandy committed
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

int inverse_video;

/* Line speed of the terminal.  */

int baud_rate;

/* nil or a symbol naming the window system under which emacs is
   running ('x is the only current possibility).  */

Lisp_Object Vwindow_system;

/* Version number of X windows: 10, 11 or nil.  */
Lisp_Object Vwindow_system_version;

/* Vector of glyph definitions.  Indexed by glyph number,
   the contents are a string which is how to output the glyph.

   If Vglyph_table is nil, a glyph is output by using its low 8 bits
   as a character code.  */

Lisp_Object Vglyph_table;

/* Display table to use for vectors that don't specify their own.  */

Lisp_Object Vstandard_display_table;

/* Nonzero means reading single-character input with prompt
Jim Blandy's avatar
Jim Blandy committed
101 102 103
   so put cursor on minibuffer after the prompt.
   positive means at end of text in echo area;
   negative means at beginning of line.  */
Jim Blandy's avatar
Jim Blandy committed
104 105
int cursor_in_echo_area;

Jim Blandy's avatar
Jim Blandy committed
106 107
/* The currently selected frame.
   In a single-frame version, this variable always remains 0.  */
Jim Blandy's avatar
Jim Blandy committed
108

Jim Blandy's avatar
Jim Blandy committed
109
FRAME_PTR selected_frame;
Jim Blandy's avatar
Jim Blandy committed
110

Jim Blandy's avatar
Jim Blandy committed
111 112 113 114
/* A frame which is not just a minibuffer, or 0 if there are no such
   frames.  This is usually the most recent such frame that was
   selected.  In a single-frame version, this variable always remains 0.  */
FRAME_PTR last_nonminibuf_frame;
Jim Blandy's avatar
Jim Blandy committed
115

Jim Blandy's avatar
Jim Blandy committed
116
/* In a single-frame version, the information that would otherwise
117 118 119 120 121 122
   exist inside frame objects lives in the following structure instead.

   NOTE: the_only_frame is not checked for garbage collection; don't
   store collectable objects in any of its fields!

   You're not/The only frame in town/...  */
Jim Blandy's avatar
Jim Blandy committed
123

Jim Blandy's avatar
Jim Blandy committed
124 125
#ifndef MULTI_FRAME
struct frame the_only_frame;
Jim Blandy's avatar
Jim Blandy committed
126
#endif
Jim Blandy's avatar
Jim Blandy committed
127 128

/* This is a vector, made larger whenever it isn't large enough,
Jim Blandy's avatar
Jim Blandy committed
129 130 131
   which is used inside `update_frame' to hold the old contents
   of the FRAME_PHYS_LINES of the frame being updated.  */
struct frame_glyphs **ophys_lines;
Jim Blandy's avatar
Jim Blandy committed
132 133 134 135 136 137 138 139 140 141 142
/* Length of vector currently allocated.  */
int ophys_lines_length;

FILE *termscript;	/* Stdio stream being used for copy of all output.  */

struct cm Wcm;		/* Structure for info on cursor positioning */

extern short ospeed;	/* Output speed (from sg_ospeed) */

int delayed_size_change;  /* 1 means SIGWINCH happened when not safe.  */

Jim Blandy's avatar
Jim Blandy committed
143
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
144

Jim Blandy's avatar
Jim Blandy committed
145 146 147 148
DEFUN ("redraw-frame", Fredraw_frame, Sredraw_frame, 1, 1, 0,
  "Clear frame FRAME and output again what is supposed to appear on it.")
  (frame)
     Lisp_Object frame;
Jim Blandy's avatar
Jim Blandy committed
149
{
Jim Blandy's avatar
Jim Blandy committed
150
  FRAME_PTR f;
Jim Blandy's avatar
Jim Blandy committed
151

Jim Blandy's avatar
Jim Blandy committed
152 153 154
  CHECK_LIVE_FRAME (frame, 0);
  f = XFRAME (frame);
  update_begin (f);
Jim Blandy's avatar
Jim Blandy committed
155
  /*  set_terminal_modes (); */
Jim Blandy's avatar
Jim Blandy committed
156
  clear_frame ();
157
  clear_frame_records (f);
Jim Blandy's avatar
Jim Blandy committed
158
  update_end (f);
Jim Blandy's avatar
Jim Blandy committed
159 160 161 162
  fflush (stdout);
  windows_or_buffers_changed++;
  /* Mark all windows as INaccurate,
     so that every window will have its redisplay done.  */
Jim Blandy's avatar
Jim Blandy committed
163 164
  mark_window_display_accurate (FRAME_ROOT_WINDOW (f), 0);
  f->garbaged = 0;
Jim Blandy's avatar
Jim Blandy committed
165 166 167
  return Qnil;
}

Jim Blandy's avatar
Jim Blandy committed
168 169
redraw_frame (f)
     FRAME_PTR f;
Jim Blandy's avatar
Jim Blandy committed
170
{
Jim Blandy's avatar
Jim Blandy committed
171 172 173
  Lisp_Object frame;
  XSET (frame, Lisp_Frame, f);
  Fredraw_frame (frame);
Jim Blandy's avatar
Jim Blandy committed
174 175
}

176
#else
Jim Blandy's avatar
Jim Blandy committed
177

178 179 180 181
DEFUN ("redraw-frame", Fredraw_frame, Sredraw_frame, 1, 1, "",
  "Clear frame FRAME and output again what is supposed to appear on it.")
  (frame)
     Lisp_Object frame;
Jim Blandy's avatar
Jim Blandy committed
182 183 184
{
  update_begin (0);
  set_terminal_modes ();
Jim Blandy's avatar
Jim Blandy committed
185
  clear_frame ();
Jim Blandy's avatar
Jim Blandy committed
186 187
  update_end (0);
  fflush (stdout);
Jim Blandy's avatar
Jim Blandy committed
188
  clear_frame_records (0);
Jim Blandy's avatar
Jim Blandy committed
189 190 191
  windows_or_buffers_changed++;
  /* Mark all windows as INaccurate,
     so that every window will have its redisplay done.  */
192
  mark_window_display_accurate (FRAME_ROOT_WINDOW (0), 0);
Jim Blandy's avatar
Jim Blandy committed
193 194 195
  return Qnil;
}

196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224
#endif

DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "",
  "Clear and redisplay all visible frames.")
  ()
{
  Lisp_Object tail, frame;

  FOR_EACH_FRAME (tail, frame)
    /* If we simply redrew all visible frames, whether or not they
       were garbaged, then this would make all frames clear and
       nredraw whenever a new frame is created or an existing frame
       is de-iconified; those events set the global frame_garbaged
       flag, to which redisplay responds by calling this function.
       
       This used to redraw all visible frames; the only advantage of
       that approach is that if a frame changes from invisible to
       visible without setting its garbaged flag, it still gets
       redisplayed.  But that should never happen; since invisible
       frames are not updated, they should always be marked as
       garbaged when they become visible again.  If that doesn't
       happen, it's a bug in the visibility code, not a bug here.  */
    if (FRAME_VISIBLE_P (XFRAME (frame))
	&& FRAME_GARBAGED_P (XFRAME (frame)))
      Fredraw_frame (frame);

  return Qnil;
}

Jim Blandy's avatar
Jim Blandy committed
225

Jim Blandy's avatar
Jim Blandy committed
226 227 228
static struct frame_glyphs *
make_frame_glyphs (frame, empty)
     register FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
229 230 231
     int empty;
{
  register int i;
Jim Blandy's avatar
Jim Blandy committed
232 233 234 235
  register width = FRAME_WIDTH (frame);
  register height = FRAME_HEIGHT (frame);
  register struct frame_glyphs *new =
    (struct frame_glyphs *) xmalloc (sizeof (struct frame_glyphs));
Jim Blandy's avatar
Jim Blandy committed
236

Jim Blandy's avatar
Jim Blandy committed
237
  SET_GLYPHS_FRAME (new, frame);
Jim Blandy's avatar
Jim Blandy committed
238 239 240 241 242 243 244 245 246 247
  new->height = height;
  new->width = width;
  new->used = (int *) xmalloc (height * sizeof (int));
  new->glyphs = (GLYPH **) xmalloc (height * sizeof (GLYPH *));
  new->highlight = (char *) xmalloc (height * sizeof (char));
  new->enable = (char *) xmalloc (height * sizeof (char));
  bzero (new->enable, height * sizeof (char));
  new->bufp = (int *) xmalloc (height * sizeof (int));

#ifdef HAVE_X_WINDOWS
248
  if (FRAME_X_P (frame))
Jim Blandy's avatar
Jim Blandy committed
249 250 251 252 253
    {
      new->top_left_x = (short *) xmalloc (height * sizeof (short));
      new->top_left_y = (short *) xmalloc (height * sizeof (short));
      new->pix_width = (short *) xmalloc (height * sizeof (short));
      new->pix_height = (short *) xmalloc (height * sizeof (short));
254
      new->max_ascent = (short *) xmalloc (height * sizeof (short));
Jim Blandy's avatar
Jim Blandy committed
255 256 257 258 259 260
    }
#endif

  if (empty)
    {
      /* Make the buffer used by decode_mode_spec.  This buffer is also
Jim Blandy's avatar
Jim Blandy committed
261
         used as temporary storage when updating the frame.  See scroll.c. */
Jim Blandy's avatar
Jim Blandy committed
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
      unsigned int total_glyphs = (width + 2) * sizeof (GLYPH);

      new->total_contents = (GLYPH *) xmalloc (total_glyphs);
      bzero (new->total_contents, total_glyphs);
    }
  else
    {
      unsigned int total_glyphs = height * (width + 2) * sizeof (GLYPH);

      new->total_contents = (GLYPH *) xmalloc (total_glyphs);
      bzero (new->total_contents, total_glyphs);
      for (i = 0; i < height; i++)
	new->glyphs[i] = new->total_contents + i * (width + 2) + 1;
    }

  return new;
}

static void
Jim Blandy's avatar
Jim Blandy committed
281 282 283
free_frame_glyphs (frame, glyphs)
     FRAME_PTR frame;
     struct frame_glyphs *glyphs;
Jim Blandy's avatar
Jim Blandy committed
284 285
{
  if (glyphs->total_contents)
286
    xfree (glyphs->total_contents);
Jim Blandy's avatar
Jim Blandy committed
287

288 289 290 291 292
  xfree (glyphs->used);
  xfree (glyphs->glyphs);
  xfree (glyphs->highlight);
  xfree (glyphs->enable);
  xfree (glyphs->bufp);
Jim Blandy's avatar
Jim Blandy committed
293 294

#ifdef HAVE_X_WINDOWS
295
  if (FRAME_X_P (frame))
Jim Blandy's avatar
Jim Blandy committed
296
    {
297 298 299 300 301
      xfree (glyphs->top_left_x);
      xfree (glyphs->top_left_y);
      xfree (glyphs->pix_width);
      xfree (glyphs->pix_height);
      xfree (glyphs->max_ascent);
Jim Blandy's avatar
Jim Blandy committed
302 303 304
    }
#endif

305
  xfree (glyphs);
Jim Blandy's avatar
Jim Blandy committed
306 307 308
}

static void
Jim Blandy's avatar
Jim Blandy committed
309 310
remake_frame_glyphs (frame)
     FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
311
{
Jim Blandy's avatar
Jim Blandy committed
312 313 314 315 316 317 318 319
  if (FRAME_CURRENT_GLYPHS (frame))
    free_frame_glyphs (frame, FRAME_CURRENT_GLYPHS (frame));
  if (FRAME_DESIRED_GLYPHS (frame))
    free_frame_glyphs (frame, FRAME_DESIRED_GLYPHS (frame));
  if (FRAME_TEMP_GLYPHS (frame))
    free_frame_glyphs (frame, FRAME_TEMP_GLYPHS (frame));

  if (FRAME_MESSAGE_BUF (frame))
320 321 322 323 324 325 326 327 328 329 330 331 332 333
    {
      /* Reallocate the frame's message buffer; remember that
	 echo_area_glyphs may be pointing here.  */
      char *old_message_buf = FRAME_MESSAGE_BUF (frame);

      FRAME_MESSAGE_BUF (frame)
	= (char *) xrealloc (FRAME_MESSAGE_BUF (frame),
			     FRAME_WIDTH (frame) + 1);

      if (echo_area_glyphs == old_message_buf)
	echo_area_glyphs = FRAME_MESSAGE_BUF (frame);
      if (previous_echo_glyphs == old_message_buf)
	previous_echo_glyphs = FRAME_MESSAGE_BUF (frame);
    }
Jim Blandy's avatar
Jim Blandy committed
334
  else
Jim Blandy's avatar
Jim Blandy committed
335 336
    FRAME_MESSAGE_BUF (frame)
      = (char *) xmalloc (FRAME_WIDTH (frame) + 1);
Jim Blandy's avatar
Jim Blandy committed
337

Jim Blandy's avatar
Jim Blandy committed
338 339 340 341
  FRAME_CURRENT_GLYPHS (frame) = make_frame_glyphs (frame, 0);
  FRAME_DESIRED_GLYPHS (frame) = make_frame_glyphs (frame, 0);
  FRAME_TEMP_GLYPHS (frame) = make_frame_glyphs (frame, 1);
  SET_FRAME_GARBAGED (frame);
Jim Blandy's avatar
Jim Blandy committed
342 343
}

Jim Blandy's avatar
Jim Blandy committed
344
/* Return the hash code of contents of line VPOS in frame-matrix M.  */
Jim Blandy's avatar
Jim Blandy committed
345 346 347

static int
line_hash_code (m, vpos)
Jim Blandy's avatar
Jim Blandy committed
348
     register struct frame_glyphs *m;
Jim Blandy's avatar
Jim Blandy committed
349 350 351 352 353 354 355 356
     int vpos;
{
  register GLYPH *body, *end;
  register int h = 0;

  if (!m->enable[vpos])
    return 0;

357
  /* Give all highlighted lines the same hash code
Jim Blandy's avatar
Jim Blandy committed
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
     so as to encourage scrolling to leave them in place.  */
  if (m->highlight[vpos])
    return -1;

  body = m->glyphs[vpos];

  if (must_write_spaces)
    while (1)
      {
	GLYPH g = *body++;

	if (g == 0)
	  break;
	h = (((h << 4) + (h >> 24)) & 0x0fffffff) + g - SPACEGLYPH;
      }
  else
    while (1)
      {
	GLYPH g = *body++;

	if (g == 0)
	  break;
	h = (((h << 4) + (h >> 24)) & 0x0fffffff) + g;
      }

  if (h)
    return h;
  return 1;
}

/* Return number of characters in line in M at vpos VPOS,
   except don't count leading and trailing spaces
   unless the terminal requires those to be explicitly output.  */

static unsigned int
line_draw_cost (m, vpos)
Jim Blandy's avatar
Jim Blandy committed
394
     struct frame_glyphs *m;
Jim Blandy's avatar
Jim Blandy committed
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
     int vpos;
{
  register GLYPH *beg = m->glyphs[vpos];
  register GLYPH *end = m->glyphs[vpos] + m->used[vpos];
  register int i;
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;

  /* Ignore trailing and leading spaces if we can.  */
  if (!must_write_spaces)
    {
      while ((end != beg) && (*end == SPACEGLYPH))
	--end;
      if (end == beg)
	return (0); /* All blank line. */

      while (*beg == SPACEGLYPH)
	++beg;
    }

  /* If we don't have a glyph-table, each glyph is one character,
     so return the number of glyphs.  */
  if (tbase == 0)
    return end - beg;

  /* Otherwise, scan the glyphs and accumulate their total size in I.  */
  i = 0;
  while ((beg <= end) && *beg)
    {
      register GLYPH g = *beg++;

      if (GLYPH_SIMPLE_P (tbase, tlen, g))
	i += 1;
      else
	i += GLYPH_LENGTH (tbase, g);
    }
  return i;
}

/* The functions on this page are the interface from xdisp.c to redisplay.

   The only other interface into redisplay is through setting
Jim Blandy's avatar
Jim Blandy committed
437 438
   FRAME_CURSOR_X (frame) and FRAME_CURSOR_Y (frame)
   and SET_FRAME_GARBAGED (frame).  */
Jim Blandy's avatar
Jim Blandy committed
439 440 441

/* cancel_line eliminates any request to display a line at position `vpos' */

Jim Blandy's avatar
Jim Blandy committed
442
cancel_line (vpos, frame)
Jim Blandy's avatar
Jim Blandy committed
443
     int vpos;
Jim Blandy's avatar
Jim Blandy committed
444
     register FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
445
{
Jim Blandy's avatar
Jim Blandy committed
446
  FRAME_DESIRED_GLYPHS (frame)->enable[vpos] = 0;
Jim Blandy's avatar
Jim Blandy committed
447 448
}

Jim Blandy's avatar
Jim Blandy committed
449 450
clear_frame_records (frame)
     register FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
451
{
Jim Blandy's avatar
Jim Blandy committed
452
  bzero (FRAME_CURRENT_GLYPHS (frame)->enable, FRAME_HEIGHT (frame));
Jim Blandy's avatar
Jim Blandy committed
453 454 455 456 457
}

/* Prepare to display on line VPOS starting at HPOS within it.  */

void
Jim Blandy's avatar
Jim Blandy committed
458 459
get_display_line (frame, vpos, hpos)
     register FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
460 461 462
     int vpos;
     register int hpos;
{
Jim Blandy's avatar
Jim Blandy committed
463 464
  register struct frame_glyphs *glyphs;
  register struct frame_glyphs *desired_glyphs = FRAME_DESIRED_GLYPHS (frame);
Jim Blandy's avatar
Jim Blandy committed
465 466
  register GLYPH *p;

467
  if (vpos < 0)
Jim Blandy's avatar
Jim Blandy committed
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
    abort ();

  if ((desired_glyphs->enable[vpos]) && desired_glyphs->used[vpos] > hpos)
    abort ();

  if (! desired_glyphs->enable[vpos])
    {
      desired_glyphs->used[vpos] = 0;
      desired_glyphs->highlight[vpos] = 0;
      desired_glyphs->enable[vpos] = 1;
    }

  if (hpos > desired_glyphs->used[vpos])
    {
      GLYPH *g = desired_glyphs->glyphs[vpos] + desired_glyphs->used[vpos];
      GLYPH *end = desired_glyphs->glyphs[vpos] + hpos;

      desired_glyphs->used[vpos] = hpos;
      while (g != end)
	*g++ = SPACEGLYPH;
    }
}

/* Like bcopy except never gets confused by overlap.  */

void
safe_bcopy (from, to, size)
     char *from, *to;
     int size;
{
498
  if (size <= 0 || from == to)
Jim Blandy's avatar
Jim Blandy committed
499 500
    return;

501 502 503 504 505 506 507 508
  /* If the source and destination don't overlap, then bcopy can
     handle it.  If they do overlap, but the destination is lower in
     memory than the source, we'll assume bcopy can handle that.  */
  if (to < from || from + size <= to)
    bcopy (from, to, size);

  /* Otherwise, we'll copy from the end.  */
  else
Jim Blandy's avatar
Jim Blandy committed
509
    {
510 511
      register char *endf = from + size;
      register char *endt = to + size;
Jim Blandy's avatar
Jim Blandy committed
512 513 514 515 516

      /* If TO - FROM is large, then we should break the copy into
	 nonoverlapping chunks of TO - FROM bytes each.  However, if
	 TO - FROM is small, then the bcopy function call overhead
	 makes this not worth it.  The crossover point could be about
517 518
	 anywhere.  Since I don't think the obvious copy loop is too
	 bad, I'm trying to err in its favor.  */
Jim Blandy's avatar
Jim Blandy committed
519 520 521 522 523 524 525 526
      if (to - from < 64)
	{
	  do
	    *--endt = *--endf;
	  while (endf != from);
	}
      else
	{
527
	  for (;;)
Jim Blandy's avatar
Jim Blandy committed
528 529 530 531
	    {
	      endt -= (to - from);
	      endf -= (to - from);

532 533 534
	      if (endt < to)
		break;

Jim Blandy's avatar
Jim Blandy committed
535 536
	      bcopy (endf, endt, to - from);
	    }
537 538

	  /* If SIZE wasn't a multiple of TO - FROM, there will be a
Jim Blandy's avatar
Jim Blandy committed
539 540 541 542 543 544 545
	     little left over.  The amount left over is
	     (endt + (to - from)) - to, which is endt - from.  */
	  bcopy (from, to, endt - from);
	}
    }
}     

Jim Blandy's avatar
Jim Blandy committed
546
/* Rotate a vector of SIZE bytes right, by DISTANCE bytes.
Jim Blandy's avatar
Jim Blandy committed
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
   DISTANCE may be negative.  */

static void
rotate_vector (vector, size, distance)
     char *vector;
     int size;
     int distance;
{
  char *temp = (char *) alloca (size);

  if (distance < 0)
    distance += size;

  bcopy (vector, temp + distance, size - distance);
  bcopy (vector + size - distance, temp, distance);
  bcopy (temp, vector, size);
}

/* Scroll lines from vpos FROM up to but not including vpos END
   down by AMOUNT lines (AMOUNT may be negative).
   Returns nonzero if done, zero if terminal cannot scroll them.  */

int
Jim Blandy's avatar
Jim Blandy committed
570 571
scroll_frame_lines (frame, from, end, amount)
     register FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
572 573 574
     int from, end, amount;
{
  register int i;
Jim Blandy's avatar
Jim Blandy committed
575 576
  register struct frame_glyphs *current_frame
    = FRAME_CURRENT_GLYPHS (frame);
Jim Blandy's avatar
Jim Blandy committed
577 578 579 580 581 582 583 584 585

  if (!line_ins_del_ok)
    return 0;

  if (amount == 0)
    return 1;

  if (amount > 0)
    {
Jim Blandy's avatar
Jim Blandy committed
586
      update_begin (frame);
Jim Blandy's avatar
Jim Blandy committed
587 588 589 590 591 592
      set_terminal_window (end + amount);
      if (!scroll_region_ok)
	ins_del_lines (end, -amount);
      ins_del_lines (from, amount);
      set_terminal_window (0);

Jim Blandy's avatar
Jim Blandy committed
593
      rotate_vector (current_frame->glyphs + from,
Jim Blandy's avatar
Jim Blandy committed
594 595 596
		     sizeof (GLYPH *) * (end + amount - from),
		     amount * sizeof (GLYPH *));

Jim Blandy's avatar
Jim Blandy committed
597 598 599
      safe_bcopy (current_frame->used + from,
		  current_frame->used + from + amount,
		  (end - from) * sizeof current_frame->used[0]);
Jim Blandy's avatar
Jim Blandy committed
600

Jim Blandy's avatar
Jim Blandy committed
601 602 603
      safe_bcopy (current_frame->highlight + from,
		  current_frame->highlight + from + amount,
		  (end - from) * sizeof current_frame->highlight[0]);
Jim Blandy's avatar
Jim Blandy committed
604

Jim Blandy's avatar
Jim Blandy committed
605 606 607
      safe_bcopy (current_frame->enable + from,
		  current_frame->enable + from + amount,
		  (end - from) * sizeof current_frame->enable[0]);
Jim Blandy's avatar
Jim Blandy committed
608 609 610

      /* Mark the lines made empty by scrolling as enabled, empty and
	 normal video.  */
Jim Blandy's avatar
Jim Blandy committed
611 612 613 614
      bzero (current_frame->used + from,
	     amount * sizeof current_frame->used[0]);
      bzero (current_frame->highlight + from,
	     amount * sizeof current_frame->highlight[0]);
Jim Blandy's avatar
Jim Blandy committed
615 616
      for (i = from; i < from + amount; i++)
	{
Jim Blandy's avatar
Jim Blandy committed
617 618
	  current_frame->glyphs[i][0] = '\0';
	  current_frame->enable[i] = 1;
Jim Blandy's avatar
Jim Blandy committed
619 620
	}

Jim Blandy's avatar
Jim Blandy committed
621 622 623
      safe_bcopy (current_frame->bufp + from,
		  current_frame->bufp + from + amount,
		  (end - from) * sizeof current_frame->bufp[0]);
Jim Blandy's avatar
Jim Blandy committed
624 625

#ifdef HAVE_X_WINDOWS
626
      if (FRAME_X_P (frame))
Jim Blandy's avatar
Jim Blandy committed
627
	{
Jim Blandy's avatar
Jim Blandy committed
628 629 630
	  safe_bcopy (current_frame->top_left_x + from,
		      current_frame->top_left_x + from + amount,
		      (end - from) * sizeof current_frame->top_left_x[0]);
Jim Blandy's avatar
Jim Blandy committed
631

Jim Blandy's avatar
Jim Blandy committed
632 633 634
	  safe_bcopy (current_frame->top_left_y + from,
		      current_frame->top_left_y + from + amount,
		      (end - from) * sizeof current_frame->top_left_y[0]);
Jim Blandy's avatar
Jim Blandy committed
635

Jim Blandy's avatar
Jim Blandy committed
636 637 638
	  safe_bcopy (current_frame->pix_width + from,
		      current_frame->pix_width + from + amount,
		      (end - from) * sizeof current_frame->pix_width[0]);
Jim Blandy's avatar
Jim Blandy committed
639

Jim Blandy's avatar
Jim Blandy committed
640 641 642
	  safe_bcopy (current_frame->pix_height + from,
		      current_frame->pix_height + from + amount,
		      (end - from) * sizeof current_frame->pix_height[0]);
643 644 645 646

	  safe_bcopy (current_frame->max_ascent + from,
		      current_frame->max_ascent + from + amount,
		      (end - from) * sizeof current_frame->max_ascent[0]);
Jim Blandy's avatar
Jim Blandy committed
647 648 649
	}
#endif				/* HAVE_X_WINDOWS */

Jim Blandy's avatar
Jim Blandy committed
650
      update_end (frame);
Jim Blandy's avatar
Jim Blandy committed
651 652 653
    }
  if (amount < 0)
    {
Jim Blandy's avatar
Jim Blandy committed
654
      update_begin (frame);
Jim Blandy's avatar
Jim Blandy committed
655 656 657 658 659 660
      set_terminal_window (end);
      ins_del_lines (from + amount, amount);
      if (!scroll_region_ok)
	ins_del_lines (end + amount, -amount);
      set_terminal_window (0);

Jim Blandy's avatar
Jim Blandy committed
661
      rotate_vector (current_frame->glyphs + from + amount,
Jim Blandy's avatar
Jim Blandy committed
662 663 664
		     sizeof (GLYPH *) * (end - from - amount),
		     amount * sizeof (GLYPH *));

Jim Blandy's avatar
Jim Blandy committed
665 666 667
      safe_bcopy (current_frame->used + from,
		  current_frame->used + from + amount,
		  (end - from) * sizeof current_frame->used[0]);
Jim Blandy's avatar
Jim Blandy committed
668

Jim Blandy's avatar
Jim Blandy committed
669 670 671
      safe_bcopy (current_frame->highlight + from,
		  current_frame->highlight + from + amount,
		  (end - from) * sizeof current_frame->highlight[0]);
Jim Blandy's avatar
Jim Blandy committed
672

Jim Blandy's avatar
Jim Blandy committed
673 674 675
      safe_bcopy (current_frame->enable + from,
		  current_frame->enable + from + amount,
		  (end - from) * sizeof current_frame->enable[0]);
Jim Blandy's avatar
Jim Blandy committed
676 677 678

      /* Mark the lines made empty by scrolling as enabled, empty and
	 normal video.  */
Jim Blandy's avatar
Jim Blandy committed
679 680 681 682
      bzero (current_frame->used + end + amount,
	     - amount * sizeof current_frame->used[0]);
      bzero (current_frame->highlight + end + amount,
	     - amount * sizeof current_frame->highlight[0]);
Jim Blandy's avatar
Jim Blandy committed
683 684
      for (i = end + amount; i < end; i++)
	{
Jim Blandy's avatar
Jim Blandy committed
685 686
	  current_frame->glyphs[i][0] = '\0';
	  current_frame->enable[i] = 1;
Jim Blandy's avatar
Jim Blandy committed
687 688
	}

Jim Blandy's avatar
Jim Blandy committed
689 690 691
      safe_bcopy (current_frame->bufp + from,
		  current_frame->bufp + from + amount,
		  (end - from) * sizeof current_frame->bufp[0]);
Jim Blandy's avatar
Jim Blandy committed
692 693

#ifdef HAVE_X_WINDOWS
694
      if (FRAME_X_P (frame))
Jim Blandy's avatar
Jim Blandy committed
695
	{
Jim Blandy's avatar
Jim Blandy committed
696 697 698
	  safe_bcopy (current_frame->top_left_x + from,
		      current_frame->top_left_x + from + amount,
		      (end - from) * sizeof current_frame->top_left_x[0]);
Jim Blandy's avatar
Jim Blandy committed
699

Jim Blandy's avatar
Jim Blandy committed
700 701 702
	  safe_bcopy (current_frame->top_left_y + from,
		      current_frame->top_left_y + from + amount,
		      (end - from) * sizeof current_frame->top_left_y[0]);
Jim Blandy's avatar
Jim Blandy committed
703

Jim Blandy's avatar
Jim Blandy committed
704 705 706
	  safe_bcopy (current_frame->pix_width + from,
		      current_frame->pix_width + from + amount,
		      (end - from) * sizeof current_frame->pix_width[0]);
Jim Blandy's avatar
Jim Blandy committed
707

Jim Blandy's avatar
Jim Blandy committed
708 709 710
	  safe_bcopy (current_frame->pix_height + from,
		      current_frame->pix_height + from + amount,
		      (end - from) * sizeof current_frame->pix_height[0]);
711 712 713 714

	  safe_bcopy (current_frame->max_ascent + from,
		      current_frame->max_ascent + from + amount,
		      (end - from) * sizeof current_frame->max_ascent[0]);
Jim Blandy's avatar
Jim Blandy committed
715 716 717
	}
#endif				/* HAVE_X_WINDOWS */

Jim Blandy's avatar
Jim Blandy committed
718
      update_end (frame);
Jim Blandy's avatar
Jim Blandy committed
719 720 721 722
    }
  return 1;
}

Jim Blandy's avatar
Jim Blandy committed
723
/* After updating a window W that isn't the full frame wide,
Jim Blandy's avatar
Jim Blandy committed
724
   copy all the columns that W does not occupy
Jim Blandy's avatar
Jim Blandy committed
725 726
   into the FRAME_DESIRED_GLYPHS (frame) from the FRAME_PHYS_GLYPHS (frame)
   so that update_frame will not change those columns.  */
Jim Blandy's avatar
Jim Blandy committed
727 728 729 730 731

preserve_other_columns (w)
     struct window *w;
{
  register int vpos;
Jim Blandy's avatar
Jim Blandy committed
732 733
  register struct frame_glyphs *current_frame, *desired_frame;
  register FRAME_PTR frame = XFRAME (w->frame);
Jim Blandy's avatar
Jim Blandy committed
734 735 736 737
  int start = XFASTINT (w->left);
  int end = XFASTINT (w->left) + XFASTINT (w->width);
  int bot = XFASTINT (w->top) + XFASTINT (w->height);

Jim Blandy's avatar
Jim Blandy committed
738 739
  current_frame = FRAME_CURRENT_GLYPHS (frame);
  desired_frame = FRAME_DESIRED_GLYPHS (frame);
Jim Blandy's avatar
Jim Blandy committed
740 741 742

  for (vpos = XFASTINT (w->top); vpos < bot; vpos++)
    {
Jim Blandy's avatar
Jim Blandy committed
743
      if (current_frame->enable[vpos] && desired_frame->enable[vpos])
Jim Blandy's avatar
Jim Blandy committed
744 745 746 747 748
	{
	  if (start > 0)
	    {
	      int len;

Jim Blandy's avatar
Jim Blandy committed
749 750 751 752 753
	      bcopy (current_frame->glyphs[vpos],
		     desired_frame->glyphs[vpos], start);
	      len = min (start, current_frame->used[vpos]);
	      if (desired_frame->used[vpos] < len)
		desired_frame->used[vpos] = len;
Jim Blandy's avatar
Jim Blandy committed
754
	    }
Jim Blandy's avatar
Jim Blandy committed
755 756
	  if (current_frame->used[vpos] > end
	      && desired_frame->used[vpos] < current_frame->used[vpos])
Jim Blandy's avatar
Jim Blandy committed
757
	    {
Jim Blandy's avatar
Jim Blandy committed
758 759
	      while (desired_frame->used[vpos] < end)
		desired_frame->glyphs[vpos][desired_frame->used[vpos]++]
Jim Blandy's avatar
Jim Blandy committed
760
		  = SPACEGLYPH;
Jim Blandy's avatar
Jim Blandy committed
761 762 763 764
	      bcopy (current_frame->glyphs[vpos] + end,
		     desired_frame->glyphs[vpos] + end,
		     current_frame->used[vpos] - end);
	      desired_frame->used[vpos] = current_frame->used[vpos];
Jim Blandy's avatar
Jim Blandy committed
765 766 767 768 769 770 771
	    }
	}
    }
}

#if 0

Jim Blandy's avatar
Jim Blandy committed
772
/* If window w does not need to be updated and isn't the full frame wide,
Jim Blandy's avatar
Jim Blandy committed
773
 copy all the columns that w does occupy
Jim Blandy's avatar
Jim Blandy committed
774 775
 into the FRAME_DESIRED_LINES (frame) from the FRAME_PHYS_LINES (frame)
 so that update_frame will not change those columns.
Jim Blandy's avatar
Jim Blandy committed
776 777 778 779 780 781 782

 Have not been able to figure out how to use this correctly.  */

preserve_my_columns (w)
     struct window *w;
{
  register int vpos, fin;
Jim Blandy's avatar
Jim Blandy committed
783 784
  register struct frame_glyphs *l1, *l2;
  register FRAME_PTR frame = XFRAME (w->frame);
Jim Blandy's avatar
Jim Blandy committed
785 786 787 788 789 790
  int start = XFASTINT (w->left);
  int end = XFASTINT (w->left) + XFASTINT (w->width);
  int bot = XFASTINT (w->top) + XFASTINT (w->height);

  for (vpos = XFASTINT (w->top); vpos < bot; vpos++)
    {
Jim Blandy's avatar
Jim Blandy committed
791 792
      if ((l1 = FRAME_DESIRED_GLYPHS (frame)->glyphs[vpos + 1])
	  && (l2 = FRAME_PHYS_GLYPHS (frame)->glyphs[vpos + 1]))
Jim Blandy's avatar
Jim Blandy committed
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
	{
	  if (l2->length > start && l1->length < l2->length)
	    {
	      fin = l2->length;
	      if (fin > end) fin = end;
	      while (l1->length < start)
		l1->body[l1->length++] = ' ';
	      bcopy (l2->body + start, l1->body + start, fin - start);
	      l1->length = fin;
	    }
	}
    }
}

#endif

/* On discovering that the redisplay for a window was no good,
   cancel the columns of that window, so that when the window is
   displayed over again get_display_line will not complain.  */

cancel_my_columns (w)
     struct window *w;
{
  register int vpos;
Jim Blandy's avatar
Jim Blandy committed
817 818
  register struct frame_glyphs *desired_glyphs =
    FRAME_DESIRED_GLYPHS (XFRAME (w->frame));
Jim Blandy's avatar
Jim Blandy committed
819 820 821 822 823 824 825 826 827
  register int start = XFASTINT (w->left);
  register int bot = XFASTINT (w->top) + XFASTINT (w->height);

  for (vpos = XFASTINT (w->top); vpos < bot; vpos++)
    if (desired_glyphs->enable[vpos]
	&& desired_glyphs->used[vpos] >= start)
      desired_glyphs->used[vpos] = start;
}

Jim Blandy's avatar
Jim Blandy committed
828
/* These functions try to perform directly and immediately on the frame
Jim Blandy's avatar
Jim Blandy committed
829 830 831
   the necessary output for one change in the buffer.
   They may return 0 meaning nothing was done if anything is difficult,
   or 1 meaning the output was performed properly.
Jim Blandy's avatar
Jim Blandy committed
832
   They assume that the frame was up to date before the buffer
833
   change being displayed.  They make various other assumptions too;
Jim Blandy's avatar
Jim Blandy committed
834 835 836 837 838 839
   see command_loop_1 where these are called.  */

int
direct_output_for_insert (g)
     int g;
{
Jim Blandy's avatar
Jim Blandy committed
840 841 842
  register FRAME_PTR frame = selected_frame;
  register struct frame_glyphs *current_frame
    = FRAME_CURRENT_GLYPHS (frame);
Jim Blandy's avatar
Jim Blandy committed
843 844 845 846 847 848 849 850

#ifndef COMPILER_REGISTER_BUG
  register
#endif /* COMPILER_REGISTER_BUG */
    struct window *w = XWINDOW (selected_window);
#ifndef COMPILER_REGISTER_BUG
  register
#endif /* COMPILER_REGISTER_BUG */
Jim Blandy's avatar
Jim Blandy committed
851
    int hpos = FRAME_CURSOR_X (frame);
Jim Blandy's avatar
Jim Blandy committed
852 853 854
#ifndef COMPILER_REGISTER_BUG
  register
#endif /* COMPILER_REGISTER_BUG */
Jim Blandy's avatar
Jim Blandy committed
855
    int vpos = FRAME_CURSOR_Y (frame);
Jim Blandy's avatar
Jim Blandy committed
856

857 858 859
  /* Give up if about to continue line.  */
  if (hpos >= XFASTINT (w->left) + window_internal_width (w) - 1
    
Jim Blandy's avatar
Jim Blandy committed
860 861 862 863
  /* Avoid losing if cursor is in invisible text off left margin */
      || (XINT (w->hscroll) && hpos == XFASTINT (w->left))
    
  /* Give up if cursor outside window (in minibuf, probably) */
864
      || cursor_in_echo_area
Jim Blandy's avatar
Jim Blandy committed
865 866
      || FRAME_CURSOR_Y (frame) < XFASTINT (w->top)
      || FRAME_CURSOR_Y (frame) >= XFASTINT (w->top) + XFASTINT (w->height)
Jim Blandy's avatar
Jim Blandy committed
867

Jim Blandy's avatar
Jim Blandy committed
868
  /* Give up if cursor not really at FRAME_CURSOR_X, FRAME_CURSOR_Y */
Jim Blandy's avatar
Jim Blandy committed
869 870 871 872 873 874 875 876 877
      || !display_completed

  /* Give up if buffer appears in two places.  */
      || buffer_shared > 1

  /* Give up if w is minibuffer and a message is being displayed there */
      || (MINI_WINDOW_P (w) && echo_area_glyphs))
    return 0;

878 879 880
  {
#ifdef HAVE_X_WINDOWS
    int dummy;
881
    int face = compute_char_face (frame, w, point, -1, -1, &dummy);
882 883 884 885 886 887
#else
    int face = 0;
#endif
				  
    current_frame->glyphs[vpos][hpos] = MAKE_GLYPH (g, face);
  }
Jim Blandy's avatar
Jim Blandy committed
888 889 890 891 892 893 894
  unchanged_modified = MODIFF;
  beg_unchanged = GPT - BEG;
  XFASTINT (w->last_point) = point;
  XFASTINT (w->last_point_x) = hpos;
  XFASTINT (w->last_modified) = MODIFF;

  reassert_line_highlight (0, vpos);
Jim Blandy's avatar
Jim Blandy committed
895
  write_glyphs (&current_frame->glyphs[vpos][hpos], 1);
Jim Blandy's avatar
Jim Blandy committed
896
  fflush (stdout);
Jim Blandy's avatar
Jim Blandy committed
897 898
  ++FRAME_CURSOR_X (frame);
  if (hpos == current_frame->used[vpos])
Jim Blandy's avatar
Jim Blandy committed
899
    {
Jim Blandy's avatar
Jim Blandy committed
900 901
      current_frame->used[vpos] = hpos + 1;
      current_frame->glyphs[vpos][hpos + 1] = 0;
Jim Blandy's avatar
Jim Blandy committed
902 903 904 905 906 907 908 909 910
    }

  return 1;
}

int
direct_output_forward_char (n)
     int n;
{
Jim Blandy's avatar
Jim Blandy committed
911
  register FRAME_PTR frame = selected_frame;
Jim Blandy's avatar
Jim Blandy committed
912 913
  register struct window *w = XWINDOW (selected_window);

Jim Blandy's avatar
Jim Blandy committed
914 915
  /* Avoid losing if cursor is in invisible text off left margin
     or about to go off either side of window.  */
Jim Blandy's avatar
Jim Blandy committed
916
  if ((FRAME_CURSOR_X (frame) == XFASTINT (w->left)
Jim Blandy's avatar
Jim Blandy committed
917 918
       && (XINT (w->hscroll) || n < 0))
      || (n > 0
919
	  && (FRAME_CURSOR_X (frame) + 1 >= window_internal_width (w) - 1))
920
      || cursor_in_echo_area)
Jim Blandy's avatar
Jim Blandy committed
921 922
    return 0;

923 924 925 926
  /* Can't use direct output if highlighting a region.  */
  if (!NILP (Vtransient_mark_mode) && !NILP (current_buffer->mark_active))
    return 0;

Jim Blandy's avatar
Jim Blandy committed
927 928
  FRAME_CURSOR_X (frame) += n;
  XFASTINT (w->last_point_x) = FRAME_CURSOR_X (frame);
Jim Blandy's avatar
Jim Blandy committed
929
  XFASTINT (w->last_point) = point;
Jim Blandy's avatar
Jim Blandy committed
930
  cursor_to (FRAME_CURSOR_Y (frame), FRAME_CURSOR_X (frame));
Jim Blandy's avatar
Jim Blandy committed
931 932 933 934 935 936
  fflush (stdout);
  return 1;
}

static void update_line ();

Jim Blandy's avatar
Jim Blandy committed
937
/* Update frame F based on the data in FRAME_DESIRED_GLYPHS.
Jim Blandy's avatar
Jim Blandy committed
938 939 940 941
   Value is nonzero if redisplay stopped due to pending input.
   FORCE nonzero means do not stop for pending input.  */

int
Jim Blandy's avatar
Jim Blandy committed
942 943
update_frame (f, force, inhibit_hairy_id)
     FRAME_PTR f;
Jim Blandy's avatar
Jim Blandy committed
944 945 946
     int force;
     int inhibit_hairy_id;
{
Jim Blandy's avatar
Jim Blandy committed
947 948
  register struct frame_glyphs *current_frame = FRAME_CURRENT_GLYPHS (f);
  register struct frame_glyphs *desired_frame = FRAME_DESIRED_GLYPHS (f);
Jim Blandy's avatar
Jim Blandy committed
949 950 951 952 953 954 955 956
  register int i;
  int pause;
  int preempt_count = baud_rate / 2400 + 1;
  extern input_pending;
#ifdef HAVE_X_WINDOWS
  register int downto, leftmost;
#endif

Jim Blandy's avatar
Jim Blandy committed
957
  if (FRAME_HEIGHT (f) == 0) abort (); /* Some bug zeros some core */
Jim Blandy's avatar
Jim Blandy committed
958 959 960 961 962 963 964 965

  detect_input_pending ();
  if (input_pending && !force)
    {
      pause = 1;
      goto do_pause;
    }

Jim Blandy's avatar
Jim Blandy committed
966
  update_begin (f);
Jim Blandy's avatar
Jim Blandy committed
967 968 969 970

  if (!line_ins_del_ok)
    inhibit_hairy_id = 1;

Jim Blandy's avatar
Jim Blandy committed
971 972
  /* See if any of the desired lines are enabled; don't compute for
     i/d line if just want cursor motion. */
Jim Blandy's avatar
Jim Blandy committed
973 974
  for (i = 0; i < FRAME_HEIGHT (f); i++)
    if (desired_frame->enable[i])
Jim Blandy's avatar
Jim Blandy committed
975 976 977
      break;

  /* Try doing i/d line, if not yet inhibited.  */
Jim Blandy's avatar
Jim Blandy committed
978 979
  if (!inhibit_hairy_id && i < FRAME_HEIGHT (f))
    force |= scrolling (f);
Jim Blandy's avatar
Jim Blandy committed
980 981 982

  /* Update the individual lines as needed.  Do bottom line first.  */

Jim Blandy's avatar
Jim Blandy committed
983 984
  if (desired_frame->enable[FRAME_HEIGHT (f) - 1])
    update_line (f, FRAME_HEIGHT (f) - 1);
Jim Blandy's avatar
Jim Blandy committed
985 986

#ifdef HAVE_X_WINDOWS
987
  if (FRAME_X_P (f))
Jim Blandy's avatar
Jim Blandy committed
988
    {
Jim Blandy's avatar
Jim Blandy committed
989 990
      leftmost = downto = f->display.x->internal_border_width;
      if (desired_frame->enable[0])
Jim Blandy's avatar
Jim Blandy committed
991
	{
Jim Blandy's avatar
Jim Blandy committed
992 993 994
	  current_frame->top_left_x[FRAME_HEIGHT (f) - 1] = leftmost;
	  current_frame->top_left_y[FRAME_HEIGHT (f) - 1]
	    = PIXEL_HEIGHT (f) - f->display.x->internal_border_width
995
	      - current_frame->pix_height[FRAME_HEIGHT (f) - 1];
Jim Blandy's avatar
Jim Blandy committed
996 997
	  current_frame->top_left_x[0] = leftmost;
	  current_frame->top_left_y[0] = downto;
Jim Blandy's avatar
Jim Blandy committed
998 999 1000 1001 1002
	}
    }
#endif /* HAVE_X_WINDOWS */

  /* Now update the rest of the lines. */
Jim Blandy's avatar
Jim Blandy committed
1003
  for (i = 0; i < FRAME_HEIGHT (f) - 1 && (force || !input_pending); i++)
Jim Blandy's avatar
Jim Blandy committed
1004
    {
Jim Blandy's avatar
Jim Blandy committed
1005
      if (desired_frame->enable[i])
Jim Blandy's avatar
Jim Blandy committed
1006
	{
1007
	  if (FRAME_TERMCAP_P (f))
Jim Blandy's avatar
Jim Blandy committed
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
	    {
	      /* Flush out every so many lines.
		 Also flush out if likely to have more than 1k buffered
		 otherwise.   I'm told that some telnet connections get
		 really screwed by more than 1k output at once.  */
	      int outq = PENDING_OUTPUT_COUNT (stdout);
	      if (outq > 900
		  || (outq > 20 && ((i - 1) % preempt_count == 0)))
		{
		  fflush (stdout);
		  if (preempt_count == 1)
		    {
Jim Blandy's avatar
Jim Blandy committed
1020 1021
#ifdef EMACS_OUTQSIZE
		      if (EMACS_OUTQSIZE (0, &outq) < 0)
Jim Blandy's avatar
Jim Blandy committed
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
			/* Probably not a tty.  Ignore the error and reset
			 * the outq count. */
			outq = PENDING_OUTPUT_COUNT (stdout);
#endif
		      outq *= 10;
		      sleep (outq / baud_rate);
		    }
		}
	      if ((i - 1) % preempt_count == 0)
		detect_input_pending ();
	    }

Jim Blandy's avatar
Jim Blandy committed
1034
	  update_line (f, i);
Jim Blandy's avatar
Jim Blandy committed
1035
#ifdef HAVE_X_WINDOWS
1036
	  if (FRAME_X_P (f))
Jim Blandy's avatar
Jim Blandy committed
1037
	    {
Jim Blandy's avatar
Jim Blandy committed
1038 1039
	      current_frame->top_left_y[i] = downto;
	      current_frame->top_left_x[i] = leftmost;
Jim Blandy's avatar
Jim Blandy committed
1040 1041 1042 1043
	    }
#endif /* HAVE_X_WINDOWS */
	}

Jim Blandy's avatar
Jim Blandy committed
1044
#ifdef HAVE_X_WINDOWS
1045
      if (FRAME_X_P (f))
1046
	downto += current_frame->pix_height[i];
Jim Blandy's avatar
Jim Blandy committed
1047
#endif
Jim Blandy's avatar
Jim Blandy committed
1048
    }
Jim Blandy's avatar
Jim Blandy committed
1049
  pause = (i < FRAME_HEIGHT (f) - 1) ? i : 0;
Jim Blandy's avatar
Jim Blandy committed
1050 1051 1052 1053

  /* Now just clean up termcap drivers and set cursor, etc.  */
  if (!pause)
    {
1054 1055
      if (cursor_in_echo_area
	  && FRAME_HAS_MINIBUF_P (f))
Jim Blandy's avatar
Jim Blandy committed
1056
	{
1057 1058 1059 1060 1061 1062 1063 1064
	  int top = XINT (XWINDOW (FRAME_MINIBUF_WINDOW (f))->top);
	  int row, col;

	  if (cursor_in_echo_area < 0)
	    {
	      row = top;
	      col = 0;
	    }
Jim Blandy's avatar
Jim Blandy committed
1065
	  else
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	    {
	      /* If the minibuffer is several lines high, find the last
		 line that has any text on it.  */
	      row = FRAME_HEIGHT (f);
	      do 
		{
		  row--;
		  if (current_frame->enable[row])
		    col = current_frame->used[row];
		  else
		    col = 0;
		}
	      while (row > top && col == 0);

	      if (col >= FRAME_WIDTH (f))
		{
		  col = 0;
		  if (row < FRAME_HEIGHT (f) - 1)
		    row++;
		}
	    }

	  cursor_to (row, col);
Jim Blandy's avatar
Jim Blandy committed
1089
	}
Jim Blandy's avatar
Jim Blandy committed
1090
      else
Jim Blandy's avatar
Jim Blandy committed
1091 1092
	cursor_to (FRAME_CURSOR_Y (f), max (min (FRAME_CURSOR_X (f),
						  FRAME_WIDTH (f) - 1), 0));
Jim Blandy's avatar
Jim Blandy committed
1093 1094
    }

Jim Blandy's avatar
Jim Blandy committed
1095
  update_end (f);
Jim Blandy's avatar
Jim Blandy committed
1096 1097 1098 1099 1100 1101 1102 1103

  if (termscript)
    fflush (termscript);
  fflush (stdout);

  /* Here if output is preempted because input is detected.  */
 do_pause:

Jim Blandy's avatar
Jim Blandy committed
1104
  if (FRAME_HEIGHT (f) == 0) abort (); /* Some bug zeros some core */
Jim Blandy's avatar
Jim Blandy committed
1105 1106
  display_completed = !pause;

Jim Blandy's avatar
Jim Blandy committed
1107
  bzero (desired_frame->enable, FRAME_HEIGHT (f));
Jim Blandy's avatar
Jim Blandy committed
1108 1109 1110 1111 1112 1113 1114 1115 1116
  return pause;
}

/* Called when about to quit, to check for doing so
   at an improper time.  */

void
quit_error_check ()
{
Jim Blandy's avatar
Jim Blandy committed
1117
  if (FRAME_DESIRED_GLYPHS (selected_frame) == 0)
Jim Blandy's avatar
Jim Blandy committed
1118
    return;
Jim Blandy's avatar
Jim Blandy committed
1119
  if (FRAME_DESIRED_GLYPHS (selected_frame)->enable[0])
Jim Blandy's avatar
Jim Blandy committed
1120
    abort ();
Jim Blandy's avatar
Jim Blandy committed
1121
  if (FRAME_DESIRED_GLYPHS (selected_frame)->enable[FRAME_HEIGHT (selected_frame) - 1])