dispnew.c 200 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Updating of data structures for redisplay.
2 3 4
   Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995,
                 1997, 1998, 1999, 2000, 2001, 2002, 2003,
                 2004, 2005 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7 8 9

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
10
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
11 12 13 14 15 16 17 18 19
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
Lute Kamstra's avatar
Lute Kamstra committed
20 21
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
Jim Blandy's avatar
Jim Blandy committed
22

23
#include <config.h>
24
#include <signal.h>
25
#include <stdio.h>
Jim Blandy's avatar
Jim Blandy committed
26 27
#include <ctype.h>

Andreas Schwab's avatar
Andreas Schwab committed
28 29 30 31
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

32
#include "lisp.h"
Jim Blandy's avatar
Jim Blandy committed
33 34
#include "termchar.h"
#include "termopts.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
35
#include "termhooks.h"
36
/* cm.h must come after dispextern.h on Windows.  */
37 38
#include "dispextern.h"
#include "cm.h"
Jim Blandy's avatar
Jim Blandy committed
39
#include "buffer.h"
40
#include "charset.h"
41
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
42
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
43 44 45 46
#include "window.h"
#include "commands.h"
#include "disptab.h"
#include "indent.h"
47
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
48
#include "blockinput.h"
Andreas Schwab's avatar
Andreas Schwab committed
49
#include "process.h"
Jim Blandy's avatar
Jim Blandy committed
50

51 52 53
/* I don't know why DEC Alpha OSF1 fail to compile this file if we
   include the following file.  */
/* #include "systty.h" */
Richard M. Stallman's avatar
Richard M. Stallman committed
54
#include "syssignal.h"
Jim Blandy's avatar
Jim Blandy committed
55

Jim Blandy's avatar
Jim Blandy committed
56 57
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
Gerd Moellmann's avatar
Gerd Moellmann committed
58
#endif /* HAVE_X_WINDOWS */
Jim Blandy's avatar
Jim Blandy committed
59

60 61 62 63
#ifdef HAVE_NTGUI
#include "w32term.h"
#endif /* HAVE_NTGUI */

64
#ifdef MAC_OS
65
#include "macterm.h"
66
#endif /* MAC_OS */
67

Gerd Moellmann's avatar
Gerd Moellmann committed
68
/* Include systime.h after xterm.h to avoid double inclusion of time.h.  */
69

Gerd Moellmann's avatar
Gerd Moellmann committed
70
#include "systime.h"
71 72
#include <errno.h>

Gerd Moellmann's avatar
Gerd Moellmann committed
73 74 75 76 77 78
/* To get the prototype for `sleep'.  */

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
79
/* Get number of chars of output now in the buffer of a stdio stream.
Gerd Moellmann's avatar
Gerd Moellmann committed
80 81 82
   This ought to be built in in stdio, but it isn't.  Some s- files
   override this because their stdio internals differ.  */

83
#ifdef __GNU_LIBRARY__
Gerd Moellmann's avatar
Gerd Moellmann committed
84 85 86 87 88

/* The s- file might have overridden the definition with one that
   works for the system's C library.  But we are using the GNU C
   library, so this is the right definition for every system.  */

89 90 91
#ifdef GNU_LIBRARY_PENDING_OUTPUT_COUNT
#define PENDING_OUTPUT_COUNT GNU_LIBRARY_PENDING_OUTPUT_COUNT
#else
92
#undef	PENDING_OUTPUT_COUNT
93
#define	PENDING_OUTPUT_COUNT(FILE) ((FILE)->__bufp - (FILE)->__buffer)
94 95
#endif
#else /* not __GNU_LIBRARY__ */
96 97 98 99
#if !defined (PENDING_OUTPUT_COUNT) && HAVE_STDIO_EXT_H && HAVE___FPENDING
#include <stdio_ext.h>
#define PENDING_OUTPUT_COUNT(FILE) __fpending (FILE)
#endif
100
#ifndef PENDING_OUTPUT_COUNT
Jim Blandy's avatar
Jim Blandy committed
101 102
#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base)
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
103 104
#endif /* not __GNU_LIBRARY__ */

105
#if defined(HAVE_TERM_H) && defined (GNU_LINUX) && defined (HAVE_LIBNCURSES)
Dave Love's avatar
Dave Love committed
106 107
#include <term.h>		/* for tgetent */
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
108 109 110 111 112 113 114 115 116 117 118 119 120

/* Structure to pass dimensions around.  Used for character bounding
   boxes, glyph matrix dimensions and alike.  */

struct dim
{
  int width;
  int height;
};


/* Function prototypes.  */

121 122
static struct glyph_matrix *save_current_matrix P_ ((struct frame *));
static void restore_current_matrix P_ ((struct frame *, struct glyph_matrix *));
123
static void fake_current_matrices P_ ((Lisp_Object));
124 125
static void redraw_overlapping_rows P_ ((struct window *, int));
static void redraw_overlapped_rows P_ ((struct window *, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
126 127 128 129 130 131
static int count_blanks P_ ((struct glyph *, int));
static int count_match P_ ((struct glyph *, struct glyph *,
			    struct glyph *, struct glyph *));
static unsigned line_draw_cost P_ ((struct glyph_matrix *, int));
static void update_frame_line P_ ((struct frame *, int));
static struct dim allocate_matrices_for_frame_redisplay
132 133
     P_ ((Lisp_Object, int, int, int, int *));
static void allocate_matrices_for_window_redisplay P_ ((struct window *));
Gerd Moellmann's avatar
Gerd Moellmann committed
134 135 136 137 138 139
static int realloc_glyph_pool P_ ((struct glyph_pool *, struct dim));
static void adjust_frame_glyphs P_ ((struct frame *));
struct glyph_matrix *new_glyph_matrix P_ ((struct glyph_pool *));
static void free_glyph_matrix P_ ((struct glyph_matrix *));
static void adjust_glyph_matrix P_ ((struct window *, struct glyph_matrix *,
				     int, int, struct dim));
140
static void change_frame_size_1 P_ ((struct frame *, int, int, int, int, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
141
static void swap_glyph_pointers P_ ((struct glyph_row *, struct glyph_row *));
142
#if GLYPH_DEBUG
Gerd Moellmann's avatar
Gerd Moellmann committed
143
static int glyph_row_slice_p P_ ((struct glyph_row *, struct glyph_row *));
144
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
static void fill_up_frame_row_with_spaces P_ ((struct glyph_row *, int));
static void build_frame_matrix_from_window_tree P_ ((struct glyph_matrix *,
						     struct window *));
static void build_frame_matrix_from_leaf_window P_ ((struct glyph_matrix *,
						     struct window *));
static struct glyph_pool *new_glyph_pool P_ ((void));
static void free_glyph_pool P_ ((struct glyph_pool *));
static void adjust_frame_glyphs_initially P_ ((void));
static void adjust_frame_message_buffer P_ ((struct frame *));
static void adjust_decode_mode_spec_buffer P_ ((struct frame *));
static void fill_up_glyph_row_with_spaces P_ ((struct glyph_row *));
static void build_frame_matrix P_ ((struct frame *));
void clear_current_matrices P_ ((struct frame *));
void scroll_glyph_matrix_range P_ ((struct glyph_matrix *, int, int,
				    int, int));
static void clear_window_matrices P_ ((struct window *, int));
static void fill_up_glyph_row_area_with_spaces P_ ((struct glyph_row *, int));
static int scrolling_window P_ ((struct window *, int));
163
static int update_window_line P_ ((struct window *, int, int *));
Gerd Moellmann's avatar
Gerd Moellmann committed
164
static void update_marginal_area P_ ((struct window *, int, int));
165
static int update_text_area P_ ((struct window *, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
166 167 168 169
static void make_current P_ ((struct glyph_matrix *, struct glyph_matrix *,
			      int));
static void mirror_make_current P_ ((struct window *, int));
void check_window_matrix_pointers P_ ((struct window *));
170
#if GLYPH_DEBUG
Gerd Moellmann's avatar
Gerd Moellmann committed
171 172
static void check_matrix_pointers P_ ((struct glyph_matrix *,
				       struct glyph_matrix *));
173
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
174 175 176 177 178 179
static void mirror_line_dance P_ ((struct window *, int, int, int *, char *));
static int update_window_tree P_ ((struct window *, int));
static int update_window P_ ((struct window *, int));
static int update_frame_1 P_ ((struct frame *, int, int));
static void set_window_cursor_after_update P_ ((struct window *));
static int row_equal_p P_ ((struct window *, struct glyph_row *,
180
			    struct glyph_row *, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
181 182 183 184
static void adjust_frame_glyphs_for_window_redisplay P_ ((struct frame *));
static void adjust_frame_glyphs_for_frame_redisplay P_ ((struct frame *));
static void reverse_rows P_ ((struct glyph_matrix *, int, int));
static int margin_glyphs_to_reserve P_ ((struct window *, int, Lisp_Object));
185 186
static void sync_window_with_frame_matrix_rows P_ ((struct window *));
struct window *frame_row_to_window P_ ((struct window *, int));
Gerd Moellmann's avatar
Gerd Moellmann committed
187 188 189 190 191


/* Non-zero means don't pause redisplay for pending input.  (This is
   for debugging and for a future implementation of EDT-like
   scrolling.  */
Jim Blandy's avatar
Jim Blandy committed
192

Gerd Moellmann's avatar
Gerd Moellmann committed
193
int redisplay_dont_pause;
194

Jim Blandy's avatar
Jim Blandy committed
195
/* Nonzero upon entry to redisplay means do not assume anything about
Jim Blandy's avatar
Jim Blandy committed
196
   current contents of actual terminal frame; clear and redraw it.  */
Jim Blandy's avatar
Jim Blandy committed
197

Jim Blandy's avatar
Jim Blandy committed
198
int frame_garbaged;
Jim Blandy's avatar
Jim Blandy committed
199

Gerd Moellmann's avatar
Gerd Moellmann committed
200
/* Nonzero means last display completed.  Zero means it was preempted.  */
Jim Blandy's avatar
Jim Blandy committed
201 202 203

int display_completed;

Gerd Moellmann's avatar
Gerd Moellmann committed
204 205
/* Lisp variable visible-bell; enables use of screen-flash instead of
   audible bell.  */
Jim Blandy's avatar
Jim Blandy committed
206 207 208

int visible_bell;

Jim Blandy's avatar
Jim Blandy committed
209
/* Invert the color of the whole frame, at a low level.  */
Jim Blandy's avatar
Jim Blandy committed
210 211 212 213 214

int inverse_video;

/* Line speed of the terminal.  */

215
EMACS_INT baud_rate;
Jim Blandy's avatar
Jim Blandy committed
216

Gerd Moellmann's avatar
Gerd Moellmann committed
217 218
/* Either nil or a symbol naming the window system under which Emacs
   is running.  */
Jim Blandy's avatar
Jim Blandy committed
219 220 221 222

Lisp_Object Vwindow_system;

/* Version number of X windows: 10, 11 or nil.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
223

Jim Blandy's avatar
Jim Blandy committed
224 225
Lisp_Object Vwindow_system_version;

Gerd Moellmann's avatar
Gerd Moellmann committed
226 227
/* Vector of glyph definitions.  Indexed by glyph number, the contents
   are a string which is how to output the glyph.
Jim Blandy's avatar
Jim Blandy committed
228 229

   If Vglyph_table is nil, a glyph is output by using its low 8 bits
Gerd Moellmann's avatar
Gerd Moellmann committed
230 231 232 233
   as a character code.

   This is an obsolete feature that is no longer used.  The variable
   is retained for compatibility.  */
Jim Blandy's avatar
Jim Blandy committed
234 235 236 237 238 239 240

Lisp_Object Vglyph_table;

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

Lisp_Object Vstandard_display_table;

Gerd Moellmann's avatar
Gerd Moellmann committed
241
/* Nonzero means reading single-character input with prompt so put
242
   cursor on mini-buffer after the prompt.  Positive means at end of
Gerd Moellmann's avatar
Gerd Moellmann committed
243 244
   text in echo area; negative means at beginning of line.  */

Jim Blandy's avatar
Jim Blandy committed
245
int cursor_in_echo_area;
246

247
Lisp_Object Qdisplay_table, Qredisplay_dont_pause;
Gerd Moellmann's avatar
Gerd Moellmann committed
248

Jim Blandy's avatar
Jim Blandy committed
249

Gerd Moellmann's avatar
Gerd Moellmann committed
250
/* The currently selected frame.  In a single-frame version, this
251
   variable always equals the_only_frame.  */
Jim Blandy's avatar
Jim Blandy committed
252

253
Lisp_Object selected_frame;
Jim Blandy's avatar
Jim Blandy committed
254

Gerd Moellmann's avatar
Gerd Moellmann committed
255
/* A frame which is not just a mini-buffer, or 0 if there are no such
Jim Blandy's avatar
Jim Blandy committed
256
   frames.  This is usually the most recent such frame that was
Morten Welinder's avatar
Morten Welinder committed
257 258
   selected.  In a single-frame version, this variable always holds
   the address of the_only_frame.  */
Jim Blandy's avatar
Jim Blandy committed
259

Gerd Moellmann's avatar
Gerd Moellmann committed
260
struct frame *last_nonminibuf_frame;
261

Gerd Moellmann's avatar
Gerd Moellmann committed
262
/* Stdio stream being used for copy of all output.  */
Jim Blandy's avatar
Jim Blandy committed
263

Gerd Moellmann's avatar
Gerd Moellmann committed
264
FILE *termscript;
Jim Blandy's avatar
Jim Blandy committed
265

Gerd Moellmann's avatar
Gerd Moellmann committed
266
/* Structure for info on cursor positioning.  */
Jim Blandy's avatar
Jim Blandy committed
267

Gerd Moellmann's avatar
Gerd Moellmann committed
268
struct cm Wcm;
Jim Blandy's avatar
Jim Blandy committed
269

Gerd Moellmann's avatar
Gerd Moellmann committed
270
/* 1 means SIGWINCH happened when not safe.  */
Jim Blandy's avatar
Jim Blandy committed
271

Gerd Moellmann's avatar
Gerd Moellmann committed
272
int delayed_size_change;
Jim Blandy's avatar
Jim Blandy committed
273

Gerd Moellmann's avatar
Gerd Moellmann committed
274
/* 1 means glyph initialization has been completed at startup.  */
Jim Blandy's avatar
Jim Blandy committed
275

Gerd Moellmann's avatar
Gerd Moellmann committed
276
static int glyphs_initialized_initially_p;
Jim Blandy's avatar
Jim Blandy committed
277

Gerd Moellmann's avatar
Gerd Moellmann committed
278
/* Updated window if != 0.  Set by update_window.  */
Jim Blandy's avatar
Jim Blandy committed
279

Gerd Moellmann's avatar
Gerd Moellmann committed
280
struct window *updated_window;
Jim Blandy's avatar
Jim Blandy committed
281

Gerd Moellmann's avatar
Gerd Moellmann committed
282
/* Glyph row updated in update_window_line, and area that is updated.  */
Jim Blandy's avatar
Jim Blandy committed
283

Gerd Moellmann's avatar
Gerd Moellmann committed
284 285
struct glyph_row *updated_row;
int updated_area;
Jim Blandy's avatar
Jim Blandy committed
286

Gerd Moellmann's avatar
Gerd Moellmann committed
287
/* A glyph for a space.  */
Jim Blandy's avatar
Jim Blandy committed
288

Gerd Moellmann's avatar
Gerd Moellmann committed
289
struct glyph space_glyph;
Jim Blandy's avatar
Jim Blandy committed
290

Gerd Moellmann's avatar
Gerd Moellmann committed
291 292 293
/* Non-zero means update has been performed directly, so that there's
   no need for redisplay_internal to do much work.  Set by
   direct_output_for_insert.  */
Jim Blandy's avatar
Jim Blandy committed
294

Gerd Moellmann's avatar
Gerd Moellmann committed
295
int redisplay_performed_directly_p;
Jim Blandy's avatar
Jim Blandy committed
296

Gerd Moellmann's avatar
Gerd Moellmann committed
297 298
/* Counts of allocated structures.  These counts serve to diagnose
   memory leaks and double frees.  */
Jim Blandy's avatar
Jim Blandy committed
299

Gerd Moellmann's avatar
Gerd Moellmann committed
300 301
int glyph_matrix_count;
int glyph_pool_count;
Jim Blandy's avatar
Jim Blandy committed
302

Gerd Moellmann's avatar
Gerd Moellmann committed
303 304
/* If non-null, the frame whose frame matrices are manipulated.  If
   null, window matrices are worked on.  */
Jim Blandy's avatar
Jim Blandy committed
305

Gerd Moellmann's avatar
Gerd Moellmann committed
306
static struct frame *frame_matrix_frame;
Jim Blandy's avatar
Jim Blandy committed
307

Gerd Moellmann's avatar
Gerd Moellmann committed
308 309
/* Current interface for window-based redisplay.  Set from init_xterm.
   A null value means we are not using window-based redisplay.  */
Jim Blandy's avatar
Jim Blandy committed
310

Gerd Moellmann's avatar
Gerd Moellmann committed
311
struct redisplay_interface *rif;
Jim Blandy's avatar
Jim Blandy committed
312

Gerd Moellmann's avatar
Gerd Moellmann committed
313 314 315 316 317
/* Non-zero means that fonts have been loaded since the last glyph
   matrix adjustments.  Redisplay must stop, and glyph matrices must
   be adjusted when this flag becomes non-zero during display.  The
   reason fonts can be loaded so late is that fonts of fontsets are
   loaded on demand.  */
318

Gerd Moellmann's avatar
Gerd Moellmann committed
319
int fonts_changed_p;
320

321
/* Convert vpos and hpos from frame to window and vice versa.
Gerd Moellmann's avatar
Gerd Moellmann committed
322
   This may only be used for terminal frames.  */
323

Gerd Moellmann's avatar
Gerd Moellmann committed
324
#if GLYPH_DEBUG
Jim Blandy's avatar
Jim Blandy committed
325

Gerd Moellmann's avatar
Gerd Moellmann committed
326 327 328 329
static int window_to_frame_vpos P_ ((struct window *, int));
static int window_to_frame_hpos P_ ((struct window *, int));
#define WINDOW_TO_FRAME_VPOS(W, VPOS) window_to_frame_vpos ((W), (VPOS))
#define WINDOW_TO_FRAME_HPOS(W, HPOS) window_to_frame_hpos ((W), (HPOS))
Jim Blandy's avatar
Jim Blandy committed
330

331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361
/* One element of the ring buffer containing redisplay history
   information.  */

struct redisplay_history
{
  char trace[512 + 100];
};

/* The size of the history buffer.  */

#define REDISPLAY_HISTORY_SIZE	30

/* The redisplay history buffer.  */

static struct redisplay_history redisplay_history[REDISPLAY_HISTORY_SIZE];

/* Next free entry in redisplay_history.  */

static int history_idx;

/* A tick that's incremented each time something is added to the
   history.  */

static unsigned history_tick;

static void add_frame_display_history P_ ((struct frame *, int));
static void add_window_display_history P_ ((struct window *, char *, int));


/* Add to the redisplay history how window W has been displayed.
   MSG is a trace containing the information how W's glyph matrix
362
   has been constructed.  PAUSED_P non-zero means that the update
363 364 365 366 367 368 369 370 371
   has been interrupted for pending input.  */

static void
add_window_display_history (w, msg, paused_p)
     struct window *w;
     char *msg;
     int paused_p;
{
  char *buf;
372

373 374 375 376
  if (history_idx >= REDISPLAY_HISTORY_SIZE)
    history_idx = 0;
  buf = redisplay_history[history_idx].trace;
  ++history_idx;
377

378 379 380 381 382
  sprintf (buf, "%d: window %p (`%s')%s\n",
	   history_tick++,
	   w,
	   ((BUFFERP (w->buffer)
	     && STRINGP (XBUFFER (w->buffer)->name))
383
	    ? (char *) SDATA (XBUFFER (w->buffer)->name)
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
	    : "???"),
	   paused_p ? " ***paused***" : "");
  strcat (buf, msg);
}


/* Add to the redisplay history that frame F has been displayed.
   PAUSED_P non-zero means that the update has been interrupted for
   pending input.  */

static void
add_frame_display_history (f, paused_p)
     struct frame *f;
     int paused_p;
{
  char *buf;
400

401 402 403 404
  if (history_idx >= REDISPLAY_HISTORY_SIZE)
    history_idx = 0;
  buf = redisplay_history[history_idx].trace;
  ++history_idx;
405

406 407 408 409 410 411 412 413
  sprintf (buf, "%d: update frame %p%s",
	   history_tick++,
	   f, paused_p ? " ***paused***" : "");
}


DEFUN ("dump-redisplay-history", Fdump_redisplay_history,
       Sdump_redisplay_history, 0, 0, "",
414 415
       doc: /* Dump redisplay history to stderr.  */)
     ()
416 417 418 419 420 421 422 423 424 425 426 427 428 429
{
  int i;

  for (i = history_idx - 1; i != history_idx; --i)
    {
      if (i < 0)
	i = REDISPLAY_HISTORY_SIZE - 1;
      fprintf (stderr, "%s\n", redisplay_history[i].trace);
    }

  return Qnil;
}


Gerd Moellmann's avatar
Gerd Moellmann committed
430
#else /* GLYPH_DEBUG == 0 */
Jim Blandy's avatar
Jim Blandy committed
431

432 433
#define WINDOW_TO_FRAME_VPOS(W, VPOS) ((VPOS) + WINDOW_TOP_EDGE_LINE (W))
#define WINDOW_TO_FRAME_HPOS(W, HPOS) ((HPOS) + WINDOW_LEFT_EDGE_COL (W))
Jim Blandy's avatar
Jim Blandy committed
434

Gerd Moellmann's avatar
Gerd Moellmann committed
435
#endif /* GLYPH_DEBUG == 0 */
Jim Blandy's avatar
Jim Blandy committed
436 437


Gerd Moellmann's avatar
Gerd Moellmann committed
438 439 440
/* Like bcopy except never gets confused by overlap.  Let this be the
   first function defined in this file, or change emacs.c where the
   address of this function is used.  */
Jim Blandy's avatar
Jim Blandy committed
441 442 443

void
safe_bcopy (from, to, size)
444 445
     const char *from;
     char *to;
Jim Blandy's avatar
Jim Blandy committed
446 447
     int size;
{
448
  if (size <= 0 || from == to)
Jim Blandy's avatar
Jim Blandy committed
449 450
    return;

451 452 453 454 455 456 457 458
  /* 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
459
    {
460
      register const char *endf = from + size;
461
      register char *endt = to + size;
Jim Blandy's avatar
Jim Blandy committed
462 463 464 465 466

      /* 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
467 468
	 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
469 470 471 472 473 474 475 476
      if (to - from < 64)
	{
	  do
	    *--endt = *--endf;
	  while (endf != from);
	}
      else
	{
477
	  for (;;)
Jim Blandy's avatar
Jim Blandy committed
478 479 480 481
	    {
	      endt -= (to - from);
	      endf -= (to - from);

482 483 484
	      if (endt < to)
		break;

Jim Blandy's avatar
Jim Blandy committed
485 486
	      bcopy (endf, endt, to - from);
	    }
487 488

	  /* If SIZE wasn't a multiple of TO - FROM, there will be a
Gerd Moellmann's avatar
Gerd Moellmann committed
489 490
	     little left over.  The amount left over is (endt + (to -
	     from)) - to, which is endt - from.  */
Jim Blandy's avatar
Jim Blandy committed
491 492 493
	  bcopy (from, to, endt - from);
	}
    }
494
}
Jim Blandy's avatar
Jim Blandy committed
495 496


Gerd Moellmann's avatar
Gerd Moellmann committed
497 498 499 500 501 502 503 504 505 506 507 508 509 510

/***********************************************************************
			    Glyph Matrices
 ***********************************************************************/

/* Allocate and return a glyph_matrix structure.  POOL is the glyph
   pool from which memory for the matrix should be allocated, or null
   for window-based redisplay where no glyph pools are used.  The
   member `pool' of the glyph matrix structure returned is set to
   POOL, the structure is otherwise zeroed.  */

struct glyph_matrix *
new_glyph_matrix (pool)
     struct glyph_pool *pool;
Jim Blandy's avatar
Jim Blandy committed
511
{
Gerd Moellmann's avatar
Gerd Moellmann committed
512 513 514 515 516
  struct glyph_matrix *result;

  /* Allocate and clear.  */
  result = (struct glyph_matrix *) xmalloc (sizeof *result);
  bzero (result, sizeof *result);
Jim Blandy's avatar
Jim Blandy committed
517

Gerd Moellmann's avatar
Gerd Moellmann committed
518 519 520
  /* Increment number of allocated matrices.  This count is used
     to detect memory leaks.  */
  ++glyph_matrix_count;
Jim Blandy's avatar
Jim Blandy committed
521

Gerd Moellmann's avatar
Gerd Moellmann committed
522 523 524
  /* Set pool and return.  */
  result->pool = pool;
  return result;
Jim Blandy's avatar
Jim Blandy committed
525 526 527
}


Gerd Moellmann's avatar
Gerd Moellmann committed
528 529 530 531 532 533
/* Free glyph matrix MATRIX.  Passing in a null MATRIX is allowed.

   The global counter glyph_matrix_count is decremented when a matrix
   is freed.  If the count gets negative, more structures were freed
   than allocated, i.e. one matrix was freed more than once or a bogus
   pointer was passed to this function.
534

Gerd Moellmann's avatar
Gerd Moellmann committed
535 536 537 538 539 540 541
   If MATRIX->pool is null, this means that the matrix manages its own
   glyph memory---this is done for matrices on X frames.  Freeing the
   matrix also frees the glyph memory in this case.  */

static void
free_glyph_matrix (matrix)
     struct glyph_matrix *matrix;
Jim Blandy's avatar
Jim Blandy committed
542
{
Gerd Moellmann's avatar
Gerd Moellmann committed
543 544 545 546 547 548 549 550 551 552 553 554 555
  if (matrix)
    {
      int i;

      /* Detect the case that more matrices are freed than were
	 allocated.  */
      if (--glyph_matrix_count < 0)
	abort ();

      /* Free glyph memory if MATRIX owns it.  */
      if (matrix->pool == NULL)
	for (i = 0; i < matrix->rows_allocated; ++i)
	  xfree (matrix->rows[i].glyphs[LEFT_MARGIN_AREA]);
556

Gerd Moellmann's avatar
Gerd Moellmann committed
557 558 559 560 561
      /* Free row structures and the matrix itself.  */
      xfree (matrix->rows);
      xfree (matrix);
    }
}
Jim Blandy's avatar
Jim Blandy committed
562 563


Gerd Moellmann's avatar
Gerd Moellmann committed
564 565 566 567 568 569 570 571 572 573 574 575 576
/* Return the number of glyphs to reserve for a marginal area of
   window W.  TOTAL_GLYPHS is the number of glyphs in a complete
   display line of window W.  MARGIN gives the width of the marginal
   area in canonical character units.  MARGIN should be an integer
   or a float.  */

static int
margin_glyphs_to_reserve (w, total_glyphs, margin)
     struct window *w;
     int total_glyphs;
     Lisp_Object margin;
{
  int n;
Jim Blandy's avatar
Jim Blandy committed
577

Gerd Moellmann's avatar
Gerd Moellmann committed
578
  if (NUMBERP (margin))
Jim Blandy's avatar
Jim Blandy committed
579
    {
580
      int width = XFASTINT (w->total_cols);
Gerd Moellmann's avatar
Gerd Moellmann committed
581 582
      double d = max (0, XFLOATINT (margin));
      d = min (width / 2 - 1, d);
583
      n = (int) ((double) total_glyphs / width * d);
Gerd Moellmann's avatar
Gerd Moellmann committed
584 585 586 587 588 589 590
    }
  else
    n = 0;

  return n;
}

Jim Blandy's avatar
Jim Blandy committed
591

Gerd Moellmann's avatar
Gerd Moellmann committed
592 593
/* Adjust glyph matrix MATRIX on window W or on a frame to changed
   window sizes.
Jim Blandy's avatar
Jim Blandy committed
594

Gerd Moellmann's avatar
Gerd Moellmann committed
595 596 597 598 599
   W is null if the function is called for a frame glyph matrix.
   Otherwise it is the window MATRIX is a member of.  X and Y are the
   indices of the first column and row of MATRIX within the frame
   matrix, if such a matrix exists.  They are zero for purely
   window-based redisplay.  DIM is the needed size of the matrix.
600

Gerd Moellmann's avatar
Gerd Moellmann committed
601 602 603 604
   In window-based redisplay, where no frame matrices exist, glyph
   matrices manage their own glyph storage.  Otherwise, they allocate
   storage from a common frame glyph pool which can be found in
   MATRIX->pool.
605

Gerd Moellmann's avatar
Gerd Moellmann committed
606 607 608 609 610 611 612
   The reason for this memory management strategy is to avoid complete
   frame redraws if possible.  When we allocate from a common pool, a
   change of the location or size of a sub-matrix within the pool
   requires a complete redisplay of the frame because we cannot easily
   make sure that the current matrices of all windows still agree with
   what is displayed on the screen.  While this is usually fast, it
   leads to screen flickering.  */
613

Gerd Moellmann's avatar
Gerd Moellmann committed
614 615 616 617 618 619 620 621 622 623
static void
adjust_glyph_matrix (w, matrix, x, y, dim)
     struct window *w;
     struct glyph_matrix *matrix;
     int x, y;
     struct dim dim;
{
  int i;
  int new_rows;
  int marginal_areas_changed_p = 0;
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
624 625
  int header_line_changed_p = 0;
  int header_line_p = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
626
  int left = -1, right = -1;
627
  int window_width = -1, window_height;
Gerd Moellmann's avatar
Gerd Moellmann committed
628

629 630
  /* See if W had a header line that has disappeared now, or vice versa.
     Get W's size.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
631 632
  if (w)
    {
633 634
      window_box (w, -1, 0, 0, &window_width, &window_height);

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
635 636
      header_line_p = WINDOW_WANTS_HEADER_LINE_P (w);
      header_line_changed_p = header_line_p != matrix->header_line_p;
Gerd Moellmann's avatar
Gerd Moellmann committed
637
    }
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
638
  matrix->header_line_p = header_line_p;
639

640 641
  /* If POOL is null, MATRIX is a window matrix for window-based redisplay.
     Do nothing if MATRIX' size, position, vscroll, and marginal areas
Gerd Moellmann's avatar
Gerd Moellmann committed
642 643 644 645
     haven't changed.  This optimization is important because preserving
     the matrix means preventing redisplay.  */
  if (matrix->pool == NULL)
    {
646 647
      left = margin_glyphs_to_reserve (w, dim.width, w->left_margin_cols);
      right = margin_glyphs_to_reserve (w, dim.width, w->right_margin_cols);
Gerd Moellmann's avatar
Gerd Moellmann committed
648 649 650 651 652 653
      xassert (left >= 0 && right >= 0);
      marginal_areas_changed_p = (left != matrix->left_margin_glyphs
				  || right != matrix->right_margin_glyphs);

      if (!marginal_areas_changed_p
	  && !fonts_changed_p
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
654
	  && !header_line_changed_p
655 656
	  && matrix->window_left_col == WINDOW_LEFT_EDGE_COL (w)
	  && matrix->window_top_line == WINDOW_TOP_EDGE_LINE (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
657 658 659 660 661
	  && matrix->window_height == window_height
	  && matrix->window_vscroll == w->vscroll
	  && matrix->window_width == window_width)
	return;
    }
662

Gerd Moellmann's avatar
Gerd Moellmann committed
663 664 665 666 667 668 669 670 671 672 673 674
  /* Enlarge MATRIX->rows if necessary.  New rows are cleared.  */
  if (matrix->rows_allocated < dim.height)
    {
      int size = dim.height * sizeof (struct glyph_row);
      new_rows = dim.height - matrix->rows_allocated;
      matrix->rows = (struct glyph_row *) xrealloc (matrix->rows, size);
      bzero (matrix->rows + matrix->rows_allocated,
	     new_rows * sizeof *matrix->rows);
      matrix->rows_allocated = dim.height;
    }
  else
    new_rows = 0;
675

Gerd Moellmann's avatar
Gerd Moellmann committed
676 677 678 679 680 681
  /* If POOL is not null, MATRIX is a frame matrix or a window matrix
     on a frame not using window-based redisplay.  Set up pointers for
     each row into the glyph pool.  */
  if (matrix->pool)
    {
      xassert (matrix->pool->glyphs);
682

Gerd Moellmann's avatar
Gerd Moellmann committed
683
      if (w)
684
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
685
	  left = margin_glyphs_to_reserve (w, dim.width,
686
					   w->left_margin_cols);
Gerd Moellmann's avatar
Gerd Moellmann committed
687
	  right = margin_glyphs_to_reserve (w, dim.width,
688
					    w->right_margin_cols);
689
	}
Gerd Moellmann's avatar
Gerd Moellmann committed
690 691
      else
	left = right = 0;
692

Gerd Moellmann's avatar
Gerd Moellmann committed
693
      for (i = 0; i < dim.height; ++i)
694
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
695
	  struct glyph_row *row = &matrix->rows[i];
696 697

	  row->glyphs[LEFT_MARGIN_AREA]
Gerd Moellmann's avatar
Gerd Moellmann committed
698 699 700
	    = (matrix->pool->glyphs
	       + (y + i) * matrix->pool->ncolumns
	       + x);
701

Gerd Moellmann's avatar
Gerd Moellmann committed
702 703
	  if (w == NULL
	      || row == matrix->rows + dim.height - 1
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
704
	      || (row == matrix->rows && matrix->header_line_p))
Gerd Moellmann's avatar
Gerd Moellmann committed
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
	    {
	      row->glyphs[TEXT_AREA]
		= row->glyphs[LEFT_MARGIN_AREA];
	      row->glyphs[RIGHT_MARGIN_AREA]
		= row->glyphs[TEXT_AREA] + dim.width;
	      row->glyphs[LAST_AREA]
		= row->glyphs[RIGHT_MARGIN_AREA];
	    }
	  else
	    {
	      row->glyphs[TEXT_AREA]
		= row->glyphs[LEFT_MARGIN_AREA] + left;
	      row->glyphs[RIGHT_MARGIN_AREA]
		= row->glyphs[TEXT_AREA] + dim.width - left - right;
	      row->glyphs[LAST_AREA]
		= row->glyphs[LEFT_MARGIN_AREA] + dim.width;
	    }
722
	}
723

Gerd Moellmann's avatar
Gerd Moellmann committed
724 725 726 727 728 729
      matrix->left_margin_glyphs = left;
      matrix->right_margin_glyphs = right;
    }
  else
    {
      /* If MATRIX->pool is null, MATRIX is responsible for managing
730 731
	 its own memory.  It is a window matrix for window-based redisplay.
	 Allocate glyph memory from the heap.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
732 733
      if (dim.width > matrix->matrix_w
	  || new_rows
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
734
	  || header_line_changed_p
Gerd Moellmann's avatar
Gerd Moellmann committed
735
	  || marginal_areas_changed_p)
Jim Blandy's avatar
Jim Blandy committed
736
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
737 738
	  struct glyph_row *row = matrix->rows;
	  struct glyph_row *end = row + matrix->rows_allocated;
739

Gerd Moellmann's avatar
Gerd Moellmann committed
740 741 742 743 744 745
	  while (row < end)
	    {
	      row->glyphs[LEFT_MARGIN_AREA]
		= (struct glyph *) xrealloc (row->glyphs[LEFT_MARGIN_AREA],
					     (dim.width
					      * sizeof (struct glyph)));
746

Gerd Moellmann's avatar
Gerd Moellmann committed
747 748
	      /* The mode line never has marginal areas.  */
	      if (row == matrix->rows + dim.height - 1
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
749
		  || (row == matrix->rows && matrix->header_line_p))
Gerd Moellmann's avatar
Gerd Moellmann committed
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
		{
		  row->glyphs[TEXT_AREA]
		    = row->glyphs[LEFT_MARGIN_AREA];
		  row->glyphs[RIGHT_MARGIN_AREA]
		    = row->glyphs[TEXT_AREA] + dim.width;
		  row->glyphs[LAST_AREA]
		    = row->glyphs[RIGHT_MARGIN_AREA];
		}
	      else
		{
		  row->glyphs[TEXT_AREA]
		    = row->glyphs[LEFT_MARGIN_AREA] + left;
		  row->glyphs[RIGHT_MARGIN_AREA]
		    = row->glyphs[TEXT_AREA] + dim.width - left - right;
		  row->glyphs[LAST_AREA]
		    = row->glyphs[LEFT_MARGIN_AREA] + dim.width;
		}
	      ++row;
	    }
Jim Blandy's avatar
Jim Blandy committed
769 770
	}

Gerd Moellmann's avatar
Gerd Moellmann committed
771 772 773 774
      xassert (left >= 0 && right >= 0);
      matrix->left_margin_glyphs = left;
      matrix->right_margin_glyphs = right;
    }
775

Gerd Moellmann's avatar
Gerd Moellmann committed
776 777
  /* Number of rows to be used by MATRIX.  */
  matrix->nrows = dim.height;
778
  xassert (matrix->nrows >= 0);
Gerd Moellmann's avatar
Gerd Moellmann committed
779

780
  if (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
781
    {
782
      if (matrix == w->current_matrix)
Jim Blandy's avatar
Jim Blandy committed
783
	{
784 785 786 787 788 789
	  /* Mark rows in a current matrix of a window as not having
	     valid contents.  It's important to not do this for
	     desired matrices.  When Emacs starts, it may already be
	     building desired matrices when this function runs.  */
	  if (window_width < 0)
	    window_width = window_box_width (w, -1);
790

791 792 793 794
	  /* Optimize the case that only the height has changed (C-x 2,
	     upper window).  Invalidate all rows that are no longer part
	     of the window.  */
	  if (!marginal_areas_changed_p
795 796 797
	      && !header_line_changed_p
	      && new_rows == 0
	      && dim.width == matrix->matrix_w
798 799
	      && matrix->window_left_col == WINDOW_LEFT_EDGE_COL (w)
	      && matrix->window_top_line == WINDOW_TOP_EDGE_LINE (w)
800
	      && matrix->window_width == window_width)
801
	    {
802 803 804 805
	      /* Find the last row in the window.  */
	      for (i = 0; i < matrix->nrows && matrix->rows[i].enabled_p; ++i)
		if (MATRIX_ROW_BOTTOM_Y (matrix->rows + i) >= window_height)
		  {
806
		    ++i;
807 808
		    break;
		  }
809 810

	      /* Window end is invalid, if inside of the rows that
811
		 are invalidated below.  */
812 813 814
	      if (INTEGERP (w->window_end_vpos)
		  && XFASTINT (w->window_end_vpos) >= i)
		w->window_end_valid = Qnil;
815

816 817 818 819 820 821 822 823
	      while (i < matrix->nrows)
		matrix->rows[i++].enabled_p = 0;
	    }
	  else
	    {
	      for (i = 0; i < matrix->nrows; ++i)
		matrix->rows[i].enabled_p = 0;
	    }
Gerd Moellmann's avatar
Gerd Moellmann committed
824
	}
825
      else if (matrix == w->desired_matrix)
Gerd Moellmann's avatar
Gerd Moellmann committed
826
	{
827 828 829 830
	  /* Rows in desired matrices always have to be cleared;
	     redisplay expects this is the case when it runs, so it
	     had better be the case when we adjust matrices between
	     redisplays.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
831 832
	  for (i = 0; i < matrix->nrows; ++i)
	    matrix->rows[i].enabled_p = 0;
Jim Blandy's avatar
Jim Blandy committed
833 834
	}
    }
835 836


Gerd Moellmann's avatar
Gerd Moellmann committed
837 838 839 840 841 842 843 844 845
  /* Remember last values to be able to optimize frame redraws.  */
  matrix->matrix_x = x;
  matrix->matrix_y = y;
  matrix->matrix_w = dim.width;
  matrix->matrix_h = dim.height;

  /* Record the top y location and height of W at the time the matrix
     was last adjusted.  This is used to optimize redisplay above.  */
  if (w)
Jim Blandy's avatar
Jim Blandy committed
846
    {
847 848
      matrix->window_left_col = WINDOW_LEFT_EDGE_COL (w);
      matrix->window_top_line = WINDOW_TOP_EDGE_LINE (w);
Gerd Moellmann's avatar
Gerd Moellmann committed
849 850 851 852 853
      matrix->window_height = window_height;
      matrix->window_width = window_width;
      matrix->window_vscroll = w->vscroll;
    }
}
Jim Blandy's avatar
Jim Blandy committed
854 855


Gerd Moellmann's avatar
Gerd Moellmann committed
856 857 858 859
/* Reverse the contents of rows in MATRIX between START and END.  The
   contents of the row at END - 1 end up at START, END - 2 at START +
   1 etc.  This is part of the implementation of rotate_matrix (see
   below).  */
860

Gerd Moellmann's avatar
Gerd Moellmann committed
861 862 863 864 865 866
static void
reverse_rows (matrix, start, end)
     struct glyph_matrix *matrix;
     int start, end;
{
  int i, j;
867

Gerd Moellmann's avatar
Gerd Moellmann committed
868 869 870 871 872 873 874 875 876 877
  for (i = start, j = end - 1; i < j; ++i, --j)
    {
      /* Non-ISO HP/UX compiler doesn't like auto struct
	 initialization.  */
      struct glyph_row temp;
      temp = matrix->rows[i];
      matrix->rows[i] = matrix->rows[j];
      matrix->rows[j] = temp;
    }
}
878 879


Gerd Moellmann's avatar
Gerd Moellmann committed
880 881 882 883
/* Rotate the contents of rows in MATRIX in the range FIRST .. LAST -
   1 by BY positions.  BY < 0 means rotate left, i.e. towards lower
   indices.  (Note: this does not copy glyphs, only glyph pointers in
   row structures are moved around).
884

Gerd Moellmann's avatar
Gerd Moellmann committed
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
   The algorithm used for rotating the vector was, I believe, first
   described by Kernighan.  See the vector R as consisting of two
   sub-vectors AB, where A has length BY for BY >= 0.  The result
   after rotating is then BA.  Reverse both sub-vectors to get ArBr
   and reverse the result to get (ArBr)r which is BA.  Similar for
   rotating right.  */

void
rotate_matrix (matrix, first, last, by)
     struct glyph_matrix *matrix;
     int first, last, by;
{
  if (by < 0)
    {
      /* Up (rotate left, i.e. towards lower indices).  */
      by = -by;
      reverse_rows (matrix, first, first + by);
      reverse_rows (matrix, first + by, last);
      reverse_rows (matrix, first, last);
    }
  else if (by > 0)
    {
      /* Down (rotate right, i.e. towards higher indices).  */
      reverse_rows (matrix, last - by, last);
      reverse_rows (matrix, first, last - by);
      reverse_rows (matrix, first, last);
    }
}


/* Increment buffer positions in glyph rows of MATRIX.  Do it for rows
   with indices START <= index < END.  Increment positions by DELTA/
   DELTA_BYTES.  */

void
920
increment_matrix_positions (matrix, start, end, delta, delta_bytes)
Gerd Moellmann's avatar
Gerd Moellmann committed
921 922 923 924 925 926 927 928 929
     struct glyph_matrix *matrix;
     int start, end, delta, delta_bytes;
{
  /* Check that START and END are reasonable values.  */
  xassert (start >= 0 && start <= matrix->nrows);
  xassert (end >= 0 && end <= matrix->nrows);
  xassert (start <= end);

  for (; start < end; ++start)
930
    increment_row_positions (matrix->rows + start, delta, delta_bytes);
Gerd Moellmann's avatar
Gerd Moellmann committed
931 932 933 934 935 936 937 938 939 940 941 942 943
}


/* Enable a range of rows in glyph matrix MATRIX.  START and END are
   the row indices of the first and last + 1 row to enable.  If
   ENABLED_P is non-zero, enabled_p flags in rows will be set to 1.  */

void
enable_glyph_matrix_rows (matrix, start, end, enabled_p)
     struct glyph_matrix *matrix;
     int start, end;
     int enabled_p;
{
944 945 946
  xassert (start <= end);
  xassert (start >= 0 && start < matrix->nrows);
  xassert (end >= 0 && end <= matrix->nrows);
947

Gerd Moellmann's avatar
Gerd Moellmann committed
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
  for (; start < end; ++start)
    matrix->rows[start].enabled_p = enabled_p != 0;
}


/* Clear MATRIX.

   This empties all rows in MATRIX by setting the enabled_p flag for
   all rows of the matrix to zero.  The function prepare_desired_row
   will eventually really clear a row when it sees one with a zero
   enabled_p flag.

   Resets update hints to defaults value.  The only update hint
   currently present is the flag MATRIX->no_scrolling_p.  */

void
clear_glyph_matrix (matrix)
     struct glyph_matrix *matrix;
{
  if (matrix)
    {
      enable_glyph_matrix_rows (matrix, 0, matrix->nrows, 0);
      matrix->no_scrolling_p = 0;
    }
}
973

Gerd Moellmann's avatar
Gerd Moellmann committed
974 975 976 977 978 979 980 981 982 983 984 985

/* Shift part of the glyph matrix MATRIX of window W up or down.
   Increment y-positions in glyph rows between START and END by DY,
   and recompute their visible height.  */

void
shift_glyph_matrix (w, matrix, start, end, dy)
     struct window *w;
     struct glyph_matrix *matrix;
     int start, end, dy;
{
  int min_y, max_y;
986

Gerd Moellmann's avatar
Gerd Moellmann committed
987 988 989
  xassert (start <= end);
  xassert (start >= 0 && start < matrix->nrows);
  xassert (end >= 0 && end <= matrix->nrows);
990

991 992
  min_y = WINDOW_HEADER_LINE_HEIGHT (w);
  max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (w);
993

Gerd Moellmann's avatar
Gerd Moellmann committed
994 995 996
  for (; start < end; ++start)
    {
      struct glyph_row *row = &matrix->rows[start];
997

Gerd Moellmann's avatar
Gerd Moellmann committed
998
      row->y += dy;
999
      row->visible_height = row->height;
1000

Gerd Moellmann's avatar
Gerd Moellmann committed
1001
      if (row->y < min_y)
1002 1003 1004
	row->visible_height -= min_y - row->y;
      if (row->y + row->height > max_y)
	row->visible_height -= row->y + row->height - max_y;
Gerd Moellmann's avatar
Gerd Moellmann committed
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
    }
}


/* Mark all rows in current matrices of frame F as invalid.  Marking
   invalid is done by setting enabled_p to zero for all rows in a
   current matrix.  */

void
clear_current_matrices (f)
     register struct frame *f;
{
  /* Clear frame current matrix, if we have one.  */
  if (f->current_matrix)
    clear_glyph_matrix (f->current_matrix);

  /* Clear the matrix of the menu bar window, if such a window exists.
     The menu bar window is currently used to display menus on X when
     no toolkit support is compiled in.  */
  if (WINDOWP (f->menu_bar_window))
    clear_glyph_matrix (XWINDOW (f->menu_bar_window)->current_matrix);

1027 1028 1029
  /* Clear the matrix of the tool-bar window, if any.  */
  if (WINDOWP (f->tool_bar_window))
    clear_glyph_matrix (XWINDOW (f->tool_bar_window)->current_matrix);
Gerd Moellmann's avatar
Gerd Moellmann committed
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044

  /* Clear current window matrices.  */
  xassert (WINDOWP (FRAME_ROOT_WINDOW (f)));
  clear_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)), 0);
}


/* Clear out all display lines of F for a coming redisplay.  */

void
clear_desired_matrices (f)
     register struct frame *f;
{
  if (f->desired_matrix)
    clear_glyph_matrix (f->desired_matrix);
1045

Gerd Moellmann's avatar
Gerd Moellmann committed
1046 1047 1048
  if (WINDOWP (f->menu_bar_window))
    clear_glyph_matrix (XWINDOW (f->menu_bar_window)->desired_matrix);

1049 1050
  if (WINDOWP (f->tool_bar_window))
    clear_glyph_matrix (XWINDOW (f->tool_bar_window)->desired_matrix);
Gerd Moellmann's avatar
Gerd Moellmann committed
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 </