dispnew.c 210 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, 1993, 1994, 1995,
                 1997, 1998, 1999, 2000, 2001, 2002, 2003,
4
                 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
12 13 14 15 16 17 18

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
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
20

21
#include <config.h>
22
#include <signal.h>
23
#include <stdio.h>
Jim Blandy's avatar
Jim Blandy committed
24
#include <ctype.h>
25
#include <setjmp.h>
Jim Blandy's avatar
Jim Blandy committed
26

Andreas Schwab's avatar
Andreas Schwab committed
27 28 29 30
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

31
#include "lisp.h"
Jim Blandy's avatar
Jim Blandy committed
32 33
#include "termchar.h"
#include "termopts.h"
34
/* cm.h must come after dispextern.h on Windows.  */
35 36
#include "dispextern.h"
#include "cm.h"
Jim Blandy's avatar
Jim Blandy committed
37
#include "buffer.h"
38
#include "character.h"
39
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
40
#include "frame.h"
41
#include "termhooks.h"
Jim Blandy's avatar
Jim Blandy committed
42 43 44 45
#include "window.h"
#include "commands.h"
#include "disptab.h"
#include "indent.h"
46
#include "intervals.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
47
#include "blockinput.h"
Andreas Schwab's avatar
Andreas Schwab committed
48
#include "process.h"
Jim Blandy's avatar
Jim Blandy committed
49

50 51 52
/* 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
53
#include "syssignal.h"
Jim Blandy's avatar
Jim Blandy committed
54

Jim Blandy's avatar
Jim Blandy committed
55 56
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
Gerd Moellmann's avatar
Gerd Moellmann committed
57
#endif /* HAVE_X_WINDOWS */
Jim Blandy's avatar
Jim Blandy committed
58

59 60 61 62
#ifdef HAVE_NTGUI
#include "w32term.h"
#endif /* HAVE_NTGUI */

63 64 65 66
#ifdef HAVE_NS
#include "nsterm.h"
#endif

Gerd Moellmann's avatar
Gerd Moellmann committed
67
/* Include systime.h after xterm.h to avoid double inclusion of time.h.  */
68

Gerd Moellmann's avatar
Gerd Moellmann committed
69
#include "systime.h"
70 71
#include <errno.h>

Gerd Moellmann's avatar
Gerd Moellmann committed
72 73 74 75 76 77
/* To get the prototype for `sleep'.  */

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

Jim Blandy's avatar
Jim Blandy committed
78
/* Get number of chars of output now in the buffer of a stdio stream.
Gerd Moellmann's avatar
Gerd Moellmann committed
79 80 81
   This ought to be built in in stdio, but it isn't.  Some s- files
   override this because their stdio internals differ.  */

82
#ifdef __GNU_LIBRARY__
Gerd Moellmann's avatar
Gerd Moellmann committed
83 84 85 86 87

/* 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.  */

88 89 90
#ifdef GNU_LIBRARY_PENDING_OUTPUT_COUNT
#define PENDING_OUTPUT_COUNT GNU_LIBRARY_PENDING_OUTPUT_COUNT
#else
91
#undef	PENDING_OUTPUT_COUNT
92
#define	PENDING_OUTPUT_COUNT(FILE) ((FILE)->__bufp - (FILE)->__buffer)
93 94
#endif
#else /* not __GNU_LIBRARY__ */
95 96 97 98
#if !defined (PENDING_OUTPUT_COUNT) && HAVE_STDIO_EXT_H && HAVE___FPENDING
#include <stdio_ext.h>
#define PENDING_OUTPUT_COUNT(FILE) __fpending (FILE)
#endif
99
#ifndef PENDING_OUTPUT_COUNT
Jim Blandy's avatar
Jim Blandy committed
100 101
#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base)
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
102 103
#endif /* not __GNU_LIBRARY__ */

104
#if defined(HAVE_TERM_H) && defined (GNU_LINUX) && defined (HAVE_LIBNCURSES)
Dave Love's avatar
Dave Love committed
105 106
#include <term.h>		/* for tgetent */
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
107 108 109 110 111 112 113 114 115 116 117 118 119

/* Structure to pass dimensions around.  Used for character bounding
   boxes, glyph matrix dimensions and alike.  */

struct dim
{
  int width;
  int height;
};


/* Function prototypes.  */

120 121
static struct glyph_matrix *save_current_matrix P_ ((struct frame *));
static void restore_current_matrix P_ ((struct frame *, struct glyph_matrix *));
122
static int showing_window_margins_p P_ ((struct window *));
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

195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
/* Define PERIODIC_PREEMPTION_CHECKING to 1, if micro-second timers
   are supported, so we can check for input during redisplay at
   regular intervals.  */
#ifdef EMACS_HAS_USECS
#define PERIODIC_PREEMPTION_CHECKING 1
#else
#define PERIODIC_PREEMPTION_CHECKING 0
#endif

#if PERIODIC_PREEMPTION_CHECKING

/* If a number (float), check for user input every N seconds.  */

Lisp_Object Vredisplay_preemption_period;

/* Redisplay preemption timers.  */

static EMACS_TIME preemption_period;
static EMACS_TIME preemption_next_check;

#endif

Jim Blandy's avatar
Jim Blandy committed
217
/* Nonzero upon entry to redisplay means do not assume anything about
Jim Blandy's avatar
Jim Blandy committed
218
   current contents of actual terminal frame; clear and redraw it.  */
Jim Blandy's avatar
Jim Blandy committed
219

Jim Blandy's avatar
Jim Blandy committed
220
int frame_garbaged;
Jim Blandy's avatar
Jim Blandy committed
221

Gerd Moellmann's avatar
Gerd Moellmann committed
222
/* Nonzero means last display completed.  Zero means it was preempted.  */
Jim Blandy's avatar
Jim Blandy committed
223 224 225

int display_completed;

Gerd Moellmann's avatar
Gerd Moellmann committed
226 227
/* Lisp variable visible-bell; enables use of screen-flash instead of
   audible bell.  */
Jim Blandy's avatar
Jim Blandy committed
228 229 230

int visible_bell;

Jim Blandy's avatar
Jim Blandy committed
231
/* Invert the color of the whole frame, at a low level.  */
Jim Blandy's avatar
Jim Blandy committed
232 233 234 235 236

int inverse_video;

/* Line speed of the terminal.  */

237
EMACS_INT baud_rate;
Jim Blandy's avatar
Jim Blandy committed
238

Gerd Moellmann's avatar
Gerd Moellmann committed
239
/* Either nil or a symbol naming the window system under which Emacs
240
   creates the first frame.  */
Jim Blandy's avatar
Jim Blandy committed
241

242
Lisp_Object Vinitial_window_system;
Jim Blandy's avatar
Jim Blandy committed
243 244

/* Version number of X windows: 10, 11 or nil.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
245

Jim Blandy's avatar
Jim Blandy committed
246 247
Lisp_Object Vwindow_system_version;

Gerd Moellmann's avatar
Gerd Moellmann committed
248 249
/* 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
250 251

   If Vglyph_table is nil, a glyph is output by using its low 8 bits
Gerd Moellmann's avatar
Gerd Moellmann committed
252 253 254 255
   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
256 257 258 259 260 261 262

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
263
/* Nonzero means reading single-character input with prompt so put
264
   cursor on mini-buffer after the prompt.  Positive means at end of
Gerd Moellmann's avatar
Gerd Moellmann committed
265 266
   text in echo area; negative means at beginning of line.  */

Jim Blandy's avatar
Jim Blandy committed
267
int cursor_in_echo_area;
268

269
Lisp_Object Qdisplay_table, Qredisplay_dont_pause;
Gerd Moellmann's avatar
Gerd Moellmann committed
270

Jim Blandy's avatar
Jim Blandy committed
271

Gerd Moellmann's avatar
Gerd Moellmann committed
272
/* The currently selected frame.  In a single-frame version, this
273
   variable always equals the_only_frame.  */
Jim Blandy's avatar
Jim Blandy committed
274

275
Lisp_Object selected_frame;
Jim Blandy's avatar
Jim Blandy committed
276

Gerd Moellmann's avatar
Gerd Moellmann committed
277
/* A frame which is not just a mini-buffer, or 0 if there are no such
Jim Blandy's avatar
Jim Blandy committed
278
   frames.  This is usually the most recent such frame that was
Morten Welinder's avatar
Morten Welinder committed
279 280
   selected.  In a single-frame version, this variable always holds
   the address of the_only_frame.  */
Jim Blandy's avatar
Jim Blandy committed
281

Gerd Moellmann's avatar
Gerd Moellmann committed
282
struct frame *last_nonminibuf_frame;
283

Gerd Moellmann's avatar
Gerd Moellmann committed
284
/* 1 means SIGWINCH happened when not safe.  */
Jim Blandy's avatar
Jim Blandy committed
285

Gerd Moellmann's avatar
Gerd Moellmann committed
286
int delayed_size_change;
Jim Blandy's avatar
Jim Blandy committed
287

Gerd Moellmann's avatar
Gerd Moellmann committed
288
/* 1 means glyph initialization has been completed at startup.  */
Jim Blandy's avatar
Jim Blandy committed
289

Gerd Moellmann's avatar
Gerd Moellmann committed
290
static int glyphs_initialized_initially_p;
Jim Blandy's avatar
Jim Blandy committed
291

Gerd Moellmann's avatar
Gerd Moellmann committed
292
/* Updated window if != 0.  Set by update_window.  */
Jim Blandy's avatar
Jim Blandy committed
293

Gerd Moellmann's avatar
Gerd Moellmann committed
294
struct window *updated_window;
Jim Blandy's avatar
Jim Blandy committed
295

Gerd Moellmann's avatar
Gerd Moellmann committed
296
/* Glyph row updated in update_window_line, and area that is updated.  */
Jim Blandy's avatar
Jim Blandy committed
297

Gerd Moellmann's avatar
Gerd Moellmann committed
298 299
struct glyph_row *updated_row;
int updated_area;
Jim Blandy's avatar
Jim Blandy committed
300

Gerd Moellmann's avatar
Gerd Moellmann committed
301
/* A glyph for a space.  */
Jim Blandy's avatar
Jim Blandy committed
302

Gerd Moellmann's avatar
Gerd Moellmann committed
303
struct glyph space_glyph;
Jim Blandy's avatar
Jim Blandy committed
304

Gerd Moellmann's avatar
Gerd Moellmann committed
305 306 307
/* 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
308

Gerd Moellmann's avatar
Gerd Moellmann committed
309
int redisplay_performed_directly_p;
Jim Blandy's avatar
Jim Blandy committed
310

Gerd Moellmann's avatar
Gerd Moellmann committed
311 312
/* Counts of allocated structures.  These counts serve to diagnose
   memory leaks and double frees.  */
Jim Blandy's avatar
Jim Blandy committed
313

Gerd Moellmann's avatar
Gerd Moellmann committed
314 315
int glyph_matrix_count;
int glyph_pool_count;
Jim Blandy's avatar
Jim Blandy committed
316

Gerd Moellmann's avatar
Gerd Moellmann committed
317 318
/* If non-null, the frame whose frame matrices are manipulated.  If
   null, window matrices are worked on.  */
Jim Blandy's avatar
Jim Blandy committed
319

Gerd Moellmann's avatar
Gerd Moellmann committed
320
static struct frame *frame_matrix_frame;
Jim Blandy's avatar
Jim Blandy committed
321

Gerd Moellmann's avatar
Gerd Moellmann committed
322 323 324 325
/* 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
326 327 328
   loaded on demand.  Another reason is that a line contains many
   characters displayed by zero width or very narrow glyphs of
   variable-width fonts.  */
329

Gerd Moellmann's avatar
Gerd Moellmann committed
330
int fonts_changed_p;
331

332
/* Convert vpos and hpos from frame to window and vice versa.
Gerd Moellmann's avatar
Gerd Moellmann committed
333
   This may only be used for terminal frames.  */
334

Gerd Moellmann's avatar
Gerd Moellmann committed
335
#if GLYPH_DEBUG
Jim Blandy's avatar
Jim Blandy committed
336

Gerd Moellmann's avatar
Gerd Moellmann committed
337 338 339 340
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
341

342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368
/* 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));
Richard M. Stallman's avatar
Richard M. Stallman committed
369

370 371
/* Add to the redisplay history how window W has been displayed.
   MSG is a trace containing the information how W's glyph matrix
372
   has been constructed.  PAUSED_P non-zero means that the update
373 374 375 376 377 378 379 380 381
   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;
382

383 384 385 386
  if (history_idx >= REDISPLAY_HISTORY_SIZE)
    history_idx = 0;
  buf = redisplay_history[history_idx].trace;
  ++history_idx;
387

388 389 390 391 392
  sprintf (buf, "%d: window %p (`%s')%s\n",
	   history_tick++,
	   w,
	   ((BUFFERP (w->buffer)
	     && STRINGP (XBUFFER (w->buffer)->name))
393
	    ? (char *) SDATA (XBUFFER (w->buffer)->name)
394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409
	    : "???"),
	   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;
410

411 412 413 414
  if (history_idx >= REDISPLAY_HISTORY_SIZE)
    history_idx = 0;
  buf = redisplay_history[history_idx].trace;
  ++history_idx;
415

416 417 418 419 420 421 422 423
  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, "",
424 425
       doc: /* Dump redisplay history to stderr.  */)
     ()
426 427 428 429 430 431 432 433 434 435 436 437 438 439
{
  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
440
#else /* GLYPH_DEBUG == 0 */
Jim Blandy's avatar
Jim Blandy committed
441

442 443
#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
444

Gerd Moellmann's avatar
Gerd Moellmann committed
445
#endif /* GLYPH_DEBUG == 0 */
Jim Blandy's avatar
Jim Blandy committed
446 447


Gerd Moellmann's avatar
Gerd Moellmann committed
448 449 450
/* 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
451 452 453

void
safe_bcopy (from, to, size)
454 455
     const char *from;
     char *to;
Jim Blandy's avatar
Jim Blandy committed
456 457
     int size;
{
458
  if (size <= 0 || from == to)
Jim Blandy's avatar
Jim Blandy committed
459 460
    return;

461 462 463 464 465 466 467 468
  /* 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
469
    {
470
      register const char *endf = from + size;
471
      register char *endt = to + size;
Jim Blandy's avatar
Jim Blandy committed
472 473 474 475 476

      /* 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
477 478
	 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
479 480 481 482 483 484 485 486
      if (to - from < 64)
	{
	  do
	    *--endt = *--endf;
	  while (endf != from);
	}
      else
	{
487
	  for (;;)
Jim Blandy's avatar
Jim Blandy committed
488 489 490 491
	    {
	      endt -= (to - from);
	      endf -= (to - from);

492 493 494
	      if (endt < to)
		break;

Jim Blandy's avatar
Jim Blandy committed
495 496
	      bcopy (endf, endt, to - from);
	    }
497 498

	  /* If SIZE wasn't a multiple of TO - FROM, there will be a
Gerd Moellmann's avatar
Gerd Moellmann committed
499 500
	     little left over.  The amount left over is (endt + (to -
	     from)) - to, which is endt - from.  */
Jim Blandy's avatar
Jim Blandy committed
501 502 503
	  bcopy (from, to, endt - from);
	}
    }
504
}
Jim Blandy's avatar
Jim Blandy committed
505 506


Gerd Moellmann's avatar
Gerd Moellmann committed
507 508 509 510 511 512 513 514 515 516 517 518 519 520

/***********************************************************************
			    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
521
{
Gerd Moellmann's avatar
Gerd Moellmann committed
522 523 524 525 526
  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
527

Gerd Moellmann's avatar
Gerd Moellmann committed
528 529 530
  /* Increment number of allocated matrices.  This count is used
     to detect memory leaks.  */
  ++glyph_matrix_count;
Jim Blandy's avatar
Jim Blandy committed
531

Gerd Moellmann's avatar
Gerd Moellmann committed
532 533 534
  /* Set pool and return.  */
  result->pool = pool;
  return result;
Jim Blandy's avatar
Jim Blandy committed
535 536 537
}


Gerd Moellmann's avatar
Gerd Moellmann committed
538 539 540 541 542 543
/* 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.
544

Gerd Moellmann's avatar
Gerd Moellmann committed
545 546 547 548 549 550 551
   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
552
{
Gerd Moellmann's avatar
Gerd Moellmann committed
553 554 555 556 557 558 559 560 561 562 563 564 565
  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]);
566

Gerd Moellmann's avatar
Gerd Moellmann committed
567 568 569 570 571
      /* Free row structures and the matrix itself.  */
      xfree (matrix->rows);
      xfree (matrix);
    }
}
Jim Blandy's avatar
Jim Blandy committed
572 573


Gerd Moellmann's avatar
Gerd Moellmann committed
574 575 576 577 578 579 580 581 582 583 584 585 586
/* 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
587

Gerd Moellmann's avatar
Gerd Moellmann committed
588
  if (NUMBERP (margin))
Jim Blandy's avatar
Jim Blandy committed
589
    {
590
      int width = XFASTINT (w->total_cols);
Gerd Moellmann's avatar
Gerd Moellmann committed
591 592
      double d = max (0, XFLOATINT (margin));
      d = min (width / 2 - 1, d);
593
      n = (int) ((double) total_glyphs / width * d);
Gerd Moellmann's avatar
Gerd Moellmann committed
594 595 596 597 598 599 600
    }
  else
    n = 0;

  return n;
}

Jim Blandy's avatar
Jim Blandy committed
601

Gerd Moellmann's avatar
Gerd Moellmann committed
602 603
/* Adjust glyph matrix MATRIX on window W or on a frame to changed
   window sizes.
Jim Blandy's avatar
Jim Blandy committed
604

Gerd Moellmann's avatar
Gerd Moellmann committed
605 606 607 608 609
   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.
610

Gerd Moellmann's avatar
Gerd Moellmann committed
611 612 613 614
   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.
615

Gerd Moellmann's avatar
Gerd Moellmann committed
616 617 618 619 620 621 622
   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.  */
623

Gerd Moellmann's avatar
Gerd Moellmann committed
624 625 626 627 628 629 630 631 632 633
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
634 635
  int header_line_changed_p = 0;
  int header_line_p = 0;
Gerd Moellmann's avatar
Gerd Moellmann committed
636
  int left = -1, right = -1;
637
  int window_width = -1, window_height = -1;
Gerd Moellmann's avatar
Gerd Moellmann committed
638

Kenichi Handa's avatar
Kenichi Handa committed
639 640
  /* 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
641 642
  if (w)
    {
Kenichi Handa's avatar
Kenichi Handa committed
643 644
      window_box (w, -1, 0, 0, &window_width, &window_height);

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
645 646
      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
647
    }
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
648
  matrix->header_line_p = header_line_p;
649

Kenichi Handa's avatar
Kenichi Handa committed
650 651
  /* 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
652 653 654 655
     haven't changed.  This optimization is important because preserving
     the matrix means preventing redisplay.  */
  if (matrix->pool == NULL)
    {
656 657
      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
658 659 660 661 662 663
      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
664
	  && !header_line_changed_p
665 666
	  && 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
667 668 669 670 671
	  && matrix->window_height == window_height
	  && matrix->window_vscroll == w->vscroll
	  && matrix->window_width == window_width)
	return;
    }
672

Gerd Moellmann's avatar
Gerd Moellmann committed
673 674 675 676 677 678 679 680 681 682 683 684
  /* 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;
685

Gerd Moellmann's avatar
Gerd Moellmann committed
686 687 688 689 690 691
  /* 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);
692

Gerd Moellmann's avatar
Gerd Moellmann committed
693
      if (w)
694
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
695
	  left = margin_glyphs_to_reserve (w, dim.width,
696
					   w->left_margin_cols);
Gerd Moellmann's avatar
Gerd Moellmann committed
697
	  right = margin_glyphs_to_reserve (w, dim.width,
698
					    w->right_margin_cols);
699
	}
Gerd Moellmann's avatar
Gerd Moellmann committed
700 701
      else
	left = right = 0;
702

Gerd Moellmann's avatar
Gerd Moellmann committed
703
      for (i = 0; i < dim.height; ++i)
704
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
705
	  struct glyph_row *row = &matrix->rows[i];
706 707

	  row->glyphs[LEFT_MARGIN_AREA]
Gerd Moellmann's avatar
Gerd Moellmann committed
708 709 710
	    = (matrix->pool->glyphs
	       + (y + i) * matrix->pool->ncolumns
	       + x);
711

Gerd Moellmann's avatar
Gerd Moellmann committed
712 713
	  if (w == NULL
	      || row == matrix->rows + dim.height - 1
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
714
	      || (row == matrix->rows && matrix->header_line_p))
Gerd Moellmann's avatar
Gerd Moellmann committed
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
	    {
	      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;
	    }
732
	}
733

Gerd Moellmann's avatar
Gerd Moellmann committed
734 735 736 737 738 739
      matrix->left_margin_glyphs = left;
      matrix->right_margin_glyphs = right;
    }
  else
    {
      /* If MATRIX->pool is null, MATRIX is responsible for managing
Kenichi Handa's avatar
Kenichi Handa committed
740 741
	 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
742 743
      if (dim.width > matrix->matrix_w
	  || new_rows
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
744
	  || header_line_changed_p
Gerd Moellmann's avatar
Gerd Moellmann committed
745
	  || marginal_areas_changed_p)
Jim Blandy's avatar
Jim Blandy committed
746
	{
Gerd Moellmann's avatar
Gerd Moellmann committed
747 748
	  struct glyph_row *row = matrix->rows;
	  struct glyph_row *end = row + matrix->rows_allocated;
749

Gerd Moellmann's avatar
Gerd Moellmann committed
750 751 752 753 754 755
	  while (row < end)
	    {
	      row->glyphs[LEFT_MARGIN_AREA]
		= (struct glyph *) xrealloc (row->glyphs[LEFT_MARGIN_AREA],
					     (dim.width
					      * sizeof (struct glyph)));
756

Gerd Moellmann's avatar
Gerd Moellmann committed
757 758
	      /* The mode line never has marginal areas.  */
	      if (row == matrix->rows + dim.height - 1
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
759
		  || (row == matrix->rows && matrix->header_line_p))
Gerd Moellmann's avatar
Gerd Moellmann committed
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
		{
		  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
779 780
	}

Gerd Moellmann's avatar
Gerd Moellmann committed
781 782 783 784
      xassert (left >= 0 && right >= 0);
      matrix->left_margin_glyphs = left;
      matrix->right_margin_glyphs = right;
    }
785

Gerd Moellmann's avatar
Gerd Moellmann committed
786 787
  /* Number of rows to be used by MATRIX.  */
  matrix->nrows = dim.height;
788
  xassert (matrix->nrows >= 0);
Gerd Moellmann's avatar
Gerd Moellmann committed
789

790
  if (w)
Gerd Moellmann's avatar
Gerd Moellmann committed
791
    {
792
      if (matrix == w->current_matrix)
Jim Blandy's avatar
Jim Blandy committed
793
	{
794 795 796 797 798 799
	  /* 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);
800

801 802 803 804
	  /* 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
805 806 807
	      && !header_line_changed_p
	      && new_rows == 0
	      && dim.width == matrix->matrix_w
808 809
	      && matrix->window_left_col == WINDOW_LEFT_EDGE_COL (w)
	      && matrix->window_top_line == WINDOW_TOP_EDGE_LINE (w)
810
	      && matrix->window_width == window_width)
811
	    {
812 813 814 815
	      /* 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)
		  {
816
		    ++i;
817 818
		    break;
		  }
819 820

	      /* Window end is invalid, if inside of the rows that
821
		 are invalidated below.  */
822 823 824
	      if (INTEGERP (w->window_end_vpos)
		  && XFASTINT (w->window_end_vpos) >= i)
		w->window_end_valid = Qnil;
825

826 827 828 829 830 831 832 833
	      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
834
	}
835
      else if (matrix == w->desired_matrix)
Gerd Moellmann's avatar
Gerd Moellmann committed
836
	{
837 838 839 840
	  /* 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
841 842
	  for (i = 0; i < matrix->nrows; ++i)
	    matrix->rows[i].enabled_p = 0;
Jim Blandy's avatar
Jim Blandy committed
843 844
	}
    }
845 846


Gerd Moellmann's avatar
Gerd Moellmann committed
847 848 849 850 851 852 853 854 855
  /* 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
856
    {
857 858
      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
859 860 861 862 863
      matrix->window_height = window_height;
      matrix->window_width = window_width;
      matrix->window_vscroll = w->vscroll;
    }
}
Jim Blandy's avatar
Jim Blandy committed
864 865


Gerd Moellmann's avatar
Gerd Moellmann committed
866 867 868 869
/* 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).  */
870

Gerd Moellmann's avatar
Gerd Moellmann committed
871 872 873 874 875 876
static void
reverse_rows (matrix, start, end)
     struct glyph_matrix *matrix;
     int start, end;
{
  int i, j;
877

Gerd Moellmann's avatar
Gerd Moellmann committed
878 879 880 881 882 883 884 885 886 887
  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;
    }
}
888 889


Gerd Moellmann's avatar
Gerd Moellmann committed
890 891 892 893
/* 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).
894

Gerd Moellmann's avatar
Gerd Moellmann committed
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
   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
930
increment_matrix_positions (matrix, start, end, delta, delta_bytes)
Gerd Moellmann's avatar
Gerd Moellmann committed
931 932 933 934 935 936 937 938 939
     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)
940
    increment_row_positions (matrix->rows + start, delta, delta_bytes);
Gerd Moellmann's avatar
Gerd Moellmann committed
941 942 943 944 945 946 947 948 949 950 951 952 953
}


/* 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;
{
954 955 956
  xassert (start <= end);
  xassert (start >= 0 && start < matrix->nrows);
  xassert (end >= 0 && end <= matrix->nrows);
957

Gerd Moellmann's avatar
Gerd Moellmann committed
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
  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;
    }
}
983

Gerd Moellmann's avatar
Gerd Moellmann committed
984 985 986 987 988 989 990 991 992 993 994 995

/* 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;
996

Gerd Moellmann's avatar
Gerd Moellmann committed
997 998 999
  xassert (start <= end);
  xassert (start >= 0 && start < matrix->nrows);
  xassert (end >= 0 && end <= matrix->nrows);
1000

1001 1002
  min_y = WINDOW_HEADER_LINE_HEIGHT (w);
  max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (w);
1003

Gerd Moellmann's avatar
Gerd Moellmann committed
1004 1005 1006
  for (; start < end; ++start)
    {
      struct glyph_row *row = &matrix->rows[start];
1007

Gerd Moellmann's avatar
Gerd Moellmann committed
1008
      row->y += dy;
1009
      row->visible_height = row->height;
1010

Gerd Moellmann's avatar
Gerd Moellmann committed
1011
      if (row->y < min_y)
1012 1013 1014
	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
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
    }
}


/* 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);

1037 1038 1039
  /* 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
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054

  /* 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);
1055

Gerd Moellmann's avatar
Gerd Moellmann committed
1056 1057 1058
  if (WINDOWP (f->menu_bar_window))
    clear_glyph_matrix (XWINDOW (f->menu_bar_window)->desired_matrix);

1059 1060
  if (WINDOWP (f->tool_bar_window))
    clear_glyph_matrix (XWINDOW (f->tool_bar_window)->desired_matrix);
Gerd Moellmann's avatar
Gerd Moellmann committed
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114

  /* Do it for window matrices.  */
  xassert (WINDOWP (FRAME_ROOT_WINDOW (f)));
  clear_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)), 1);
}


/* Clear matrices in window tree rooted in W.  If DESIRED_P is
   non-zero clear desired matrices, otherwise clear current matrices.  */

static void
clear_window_matrices (w, desired_p)
     struct window *w;
     int desired_p;
{
  while (w)
    {
      if (!NILP (w->hchild))
	{
	  xassert (WINDOWP (w->hchild));
	  clear_window_matrices (XWINDOW (w->hchild), desired_p);
	}
      else if (!NILP (w->vchild))
	{
	  xassert (WINDOWP (w->vchild));
	  clear_window_matrices (XWINDOW (w->vchild), desired_p);
	}
      else
	{
	  if (desired_p)
	    clear_glyph_matrix (w->desired_matrix);
	  else
	    {
	      clear_glyph_matrix (w->current_matrix);
	      w->window_end_valid = Qnil;
	    }
	}

      w = NILP (w->next) ? 0 : XWINDOW (w->next);
    }
}



/***********************************************************************
			      Glyph Rows

      See dispextern.h for an overall explanation of glyph rows.
 ***********************************************************************/

/* Clear glyph row ROW.  Do it in a way that makes it robust against
   changes in the glyph_row structure, i.e. addition or removal of
   structure members.  */

1115 1116
static struct glyph_row null_row;

Gerd Moellmann's avatar
Gerd Moellmann committed
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
void
clear_glyph_row (row)
     struct glyph_row *row;
{
  struct glyph *p[1 + LAST_AREA];

  /* Save pointers.  */
  p[LEFT_MARGIN_AREA] = row->glyphs[LEFT_MARGIN_AREA];
  p[TEXT_AREA] = row->glyphs[TEXT_AREA];
  p[RIGHT_MARGIN_AREA] = row->glyphs[RIGHT_MARGIN_AREA];
  p[LAST_AREA] = row->glyphs[LAST_AREA];

  /* Clear.  */
  *row = null_row;

  /* Restore pointers.  */
  row->glyphs[LEFT_MARGIN_AREA] = p[LEFT_MARGIN_AREA];
  row->glyphs[TEXT_AREA] = p[TEXT_AREA];
  row->glyphs[RIGHT_MARGIN_AREA] = p[RIGHT_MARGIN_AREA];
  row->glyphs[LAST_AREA] = p[LAST_AREA];
1137 1138 1139 1140 1141 1142

#if 0 /* At some point, some bit-fields of struct glyph were not set,
	 which made glyphs unequal when compared with GLYPH_EQUAL_P.
	 Redisplay outputs such glyphs, and flickering effects were
	 the result.  This also depended on the contents of memory
	 returned by xmalloc.  If flickering happens again, activate
1143
	 the code below.  If the flickering is gone with that, chances
1144 1145 1146
	 are that the flickering has the same reason as here.  */
  bzero (p[0], (char *) p[LAST_AREA] - (char *) p[0]);
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
}


/* Make ROW an empty, enabled row of canonical character height,
   in window W starting at y-position Y.  */

void
blank_row (w, row, y)
     struct window *w;
     struct glyph_row *row;
     int y;
{
  int min_y, max_y;
1160

1161 1162
  min_y = WINDOW_HEADER_LINE_HEIGHT (w);
  max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (w);
1163

Gerd Moellmann's avatar
Gerd Moellmann committed
1164 1165
  clear_glyph_row (row);
  row->y = y;
1166
  row->ascent = row->phys_ascent = 0;
1167
  row->height = row->phys_height = FRAME_LINE_HEIGHT (XFRAME (w->frame));
1168
  row->visible_height = row->height;
1169

Gerd Moellmann's avatar
Gerd Moellmann committed
1170
  if (row->y < min_y)
1171 1172 1173
    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
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185

  row->enabled_p = 1;
}


/* Increment buffer positions in glyph row ROW.  DELTA and DELTA_BYTES
   are the amounts by which to change positions.  Note that the first
   glyph of the text area of a row can have a buffer position even if
   the used count of the text area is zero.  Such rows display line
   ends.  */

void
1186
increment_row_positions (row, delta, delta_bytes)
Gerd Moellmann's avatar
Gerd Moellmann committed
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
     struct glyph_row *row;
     int delta, delta_bytes;
{
  int area, i;

  /* Increment start and end positions.  */
  MATRIX_ROW_START_CHARPOS (row) += delta;
  MATRIX_ROW_START_BYTEPOS (row) += delta_bytes;
  MATRIX_ROW_END_CHARPOS (row) += delta;
  MATRIX_ROW_END_BYTEPOS (row) += delta_bytes;

1198 1199 1200
  if (!row->enabled_p)
    return;

Gerd Moellmann's avatar
Gerd Moellmann committed
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
  /* Increment positions in glyphs.  */
  for (area = 0; area < LAST_AREA; ++area)
    for (i = 0; i < row->used[area]; ++i)
      if (BUFFERP (row->glyphs[area][i].object)
	  && row->glyphs[area][i].charpos > 0)
	row->glyphs[area][i].charpos += delta;

  /* Capture the case of rows displaying a line end.  */
  if (row->used[TEXT_AREA] == 0
      && MATRIX_ROW_DISPLAYS_TEXT_P (row))
    row->glyphs[TEXT_AREA]->charpos += delta;
}


1215
#if 0
Gerd Moellmann's avatar
Gerd Moellmann committed
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244