xterm.c 169 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* X Communication module for terminals which understand the X protocol.
Karl Heuer's avatar
Karl Heuer committed
2
   Copyright (C) 1989, 1993, 1994, 1995 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
Jim Blandy's avatar
Jim Blandy committed
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

20 21
/* Xt features made by Fred Pierresteguy.  */

22 23 24 25 26
/* On 4.3 these lose if they come after xterm.h.  */
/* On HP-UX 8.0 signal.h loses if it comes after config.h.  */
/* Putting these at the beginning seems to be standard for other .c files.  */
#include <signal.h>

27
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
28

29 30
#include <stdio.h>

31
/* Need syssignal.h for various externs and definitions that may be required
32
   by some configurations for calls to signal later in this source file.  */
33 34
#include "syssignal.h"

Jim Blandy's avatar
Jim Blandy committed
35 36 37
#ifdef HAVE_X_WINDOWS

#include "lisp.h"
38
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
39 40 41 42

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
43
#include <X11/cursorfont.h>
Jim Blandy's avatar
Jim Blandy committed
44

45
#ifndef USG
Jim Blandy's avatar
Jim Blandy committed
46 47 48 49
/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
50 51
#endif /* makedev */
#endif /* USG */
Jim Blandy's avatar
Jim Blandy committed
52 53 54

#ifdef BSD
#include <sys/ioctl.h>
55
#endif /* ! defined (BSD) */
Jim Blandy's avatar
Jim Blandy committed
56

57
#include "systty.h"
Jim Blandy's avatar
Jim Blandy committed
58
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
59

60
#ifndef INCLUDED_FCNTL
Jim Blandy's avatar
Jim Blandy committed
61
#include <fcntl.h>
62
#endif
Jim Blandy's avatar
Jim Blandy committed
63 64 65 66
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
67 68
/* Caused redefinition of DBL_DIG on Netbsd; seems not to be needed.  */
/* #include <sys/param.h>  */
Jim Blandy's avatar
Jim Blandy committed
69

70
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
71 72 73 74 75 76 77
#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
78
#endif /* ! 0 */
Jim Blandy's avatar
Jim Blandy committed
79 80 81
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
82
#include "window.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
83
#include "keyboard.h"
Karl Heuer's avatar
Karl Heuer committed
84
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
85

86
#ifdef USE_X_TOOLKIT
87
extern void free_frame_menubar ();
88
extern void _XEditResCheckMessages ();
89 90
#endif /* USE_X_TOOLKIT */

91 92
#ifndef USE_X_TOOLKIT
#define x_any_window_to_frame x_window_to_frame
93
#define x_top_window_to_frame x_window_to_frame
94 95
#endif

96
#ifdef USE_X_TOOLKIT
Karl Heuer's avatar
Karl Heuer committed
97
#include "widget.h"
98 99 100 101 102
#ifndef XtNinitialState
#define XtNinitialState "initialState"
#endif
#endif

Jim Blandy's avatar
Jim Blandy committed
103 104
#define min(a,b) ((a)<(b) ? (a) : (b))
#define max(a,b) ((a)>(b) ? (a) : (b))
105

106 107
/* This is a chain of structures for all the X displays currently in use.  */
struct x_display_info *x_display_list;
Jim Blandy's avatar
Jim Blandy committed
108

109 110 111 112 113
/* This is a list of cons cells, each of the form (NAME . FONT-LIST-CACHE),
   one for each element of x_display_list and in the same order.
   NAME is the name of the frame.
   FONT-LIST-CACHE records previous values returned by x-list-fonts.  */
Lisp_Object x_display_name_list;
114

115
/* Frame being updated by update_frame.  This is declared in term.c.
116
   This is set by update_begin and looked at by all the
Jim Blandy's avatar
Jim Blandy committed
117
   XT functions.  It is zero while not inside an update.
Jim Blandy's avatar
Jim Blandy committed
118 119
   In that case, the XT functions assume that `selected_frame'
   is the frame to apply to.  */
120
extern struct frame *updating_frame;
Jim Blandy's avatar
Jim Blandy committed
121

122 123 124
/* This is a frame waiting to be autoraised, within XTread_socket.  */
struct frame *pending_autoraise_frame;

125 126 127
#ifdef USE_X_TOOLKIT
/* The application context for Xt use.  */
XtAppContext Xt_app_con;
128 129 130 131 132

static String Xt_default_resources[] =
{
  0
};
133 134
#endif

Jim Blandy's avatar
Jim Blandy committed
135 136 137 138 139 140 141 142 143 144 145 146 147 148
/* During an update, maximum vpos for ins/del line operations to affect.  */

static int flexlines;

/* During an update, nonzero if chars output now should be highlighted.  */

static int highlight;

/* Nominal cursor position -- where to draw output.
   During an update, these are different from the cursor-box position.  */

static int curs_x;
static int curs_y;

149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
/* Mouse movement.

   In order to avoid asking for motion events and then throwing most
   of them away or busy-polling the server for mouse positions, we ask
   the server for pointer motion hints.  This means that we get only
   one event per group of mouse movements.  "Groups" are delimited by
   other kinds of events (focus changes and button clicks, for
   example), or by XQueryPointer calls; when one of these happens, we
   get another MotionNotify event the next time the mouse moves.  This
   is at least as efficient as getting motion events when mouse
   tracking is on, and I suspect only negligibly worse when tracking
   is off.

   The silly O'Reilly & Associates Nutshell guides barely document
   pointer motion hints at all (I think you have to infer how they
   work from an example), and the description of XQueryPointer doesn't
   mention that calling it causes you to get another motion hint from
   the server, which is very important.  */

/* Where the mouse was last time we reported a mouse event.  */
static FRAME_PTR last_mouse_frame;
static XRectangle last_mouse_glyph;

/* The scroll bar in which the last X motion event occurred.

   If the last X motion event occurred in a scroll bar, we set this
   so XTmouse_position can know whether to report a scroll bar motion or
   an ordinary motion.

   If the last X motion event didn't occur in a scroll bar, we set this
   to Qnil, to tell XTmouse_position to return an ordinary motion event.  */
static Lisp_Object last_mouse_scroll_bar;

/* This is a hack.  We would really prefer that XTmouse_position would
   return the time associated with the position it returns, but there
   doesn't seem to be any way to wrest the timestamp from the server
   along with the position query.  So, we just keep track of the time
   of the last movement we received, and return that in hopes that
   it's somewhat accurate.  */
static Time last_mouse_movement_time;

190 191 192 193 194 195 196
/* Incremented by XTread_socket whenever it really tries to read events.  */
#ifdef __STDC__
static int volatile input_signal_count;
#else
static int input_signal_count;
#endif

197 198
/* Used locally within XTread_socket.  */
static int x_noop_count;
Jim Blandy's avatar
Jim Blandy committed
199

200 201 202
/* Initial values of argv and argc.  */
extern char **initial_argv;
extern int initial_argc;
Jim Blandy's avatar
Jim Blandy committed
203

204
extern Lisp_Object Vcommand_line_args, Vsystem_name;
Jim Blandy's avatar
Jim Blandy committed
205

206 207 208
/* Tells if a window manager is present or not. */

extern Lisp_Object Vx_no_window_manager;
Jim Blandy's avatar
Jim Blandy committed
209 210 211 212

/* Nonzero enables some debugging for the X interface code. */
extern int _Xdebug;

213
extern Lisp_Object Qface, Qmouse_face;
214

Jim Blandy's avatar
Jim Blandy committed
215 216
extern int errno;

217
/* A mask of extra modifier bits to put into every keyboard char.  */
218 219
extern int extra_keyboard_modifiers;

220 221
static Lisp_Object Qvendor_specific_keysyms;

222
extern XrmDatabase x_load_resources ();
Jim Blandy's avatar
Jim Blandy committed
223

224 225
extern Lisp_Object x_icon_type ();

226 227
void x_delete_display ();

228
static void redraw_previous_char ();
229
static void redraw_following_char ();
230
static unsigned int x_x_to_emacs_modifiers ();
Jim Blandy's avatar
Jim Blandy committed
231

232
static int fast_find_position ();
233 234 235
static void note_mouse_highlight ();
static void clear_mouse_face ();
static void show_mouse_face ();
236
static void do_line_dance ();
237

Jim Blandy's avatar
Jim Blandy committed
238 239
static int XTcursor_to ();
static int XTclear_end_of_line ();
240
static int x_io_error_quitter ();
241 242
void x_catch_errors ();
void x_uncatch_errors ();
243

244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
#if 0
/* This is a function useful for recording debugging information
   about the sequence of occurrences in this file.  */

struct record 
{
  char *locus;
  int type;
};

struct record event_record[100];

int event_record_index;

record_event (locus, type)
     char *locus;
     int type;
{
  if (event_record_index == sizeof (event_record) / sizeof (struct record))
    event_record_index = 0;

  event_record[event_record_index].locus = locus;
  event_record[event_record_index].type = type;
  event_record_index++;
}

#endif /* 0 */

272 273 274 275 276 277 278 279 280 281 282
/* Return the struct x_display_info corresponding to DPY.  */

struct x_display_info *
x_display_info_for_display (dpy)
     Display *dpy;
{
  struct x_display_info *dpyinfo;

  for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
    if (dpyinfo->display == dpy)
      return dpyinfo;
283

284 285
  return 0;
}
Jim Blandy's avatar
Jim Blandy committed
286

287
/* Starting and ending updates.
288 289

   These hooks are called by update_frame at the beginning and end
Jim Blandy's avatar
Jim Blandy committed
290 291 292
   of a frame update.  We record in `updating_frame' the identity
   of the frame being updated, so that the XT... functions do not
   need to take a frame as argument.  Most of the XT... functions
Jim Blandy's avatar
Jim Blandy committed
293
   should never be called except during an update, the only exceptions
294
   being XTcursor_to, XTwrite_glyphs and XTreassert_line_highlight.  */
Jim Blandy's avatar
Jim Blandy committed
295 296

static
Jim Blandy's avatar
Jim Blandy committed
297 298
XTupdate_begin (f)
     struct frame *f;
299
{
Jim Blandy's avatar
Jim Blandy committed
300 301
  int mask;

Jim Blandy's avatar
Jim Blandy committed
302
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
303 304
    abort ();

Jim Blandy's avatar
Jim Blandy committed
305
  flexlines = f->height;
Jim Blandy's avatar
Jim Blandy committed
306 307 308
  highlight = 0;

  BLOCK_INPUT;
309

310
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
311
    {
312
      /* Don't do highlighting for mouse motion during the update.  */
313
      FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 1;
314 315 316

      /* If the frame needs to be redrawn,
	 simply forget about any prior mouse highlighting.  */
317
      if (FRAME_GARBAGED_P (f))
318 319
	FRAME_X_DISPLAY_INFO (f)->mouse_face_window = Qnil;

320
      if (!NILP (FRAME_X_DISPLAY_INFO (f)->mouse_face_window))
321 322
	{
	  int firstline, lastline, i;
323
	  struct window *w = XWINDOW (FRAME_X_DISPLAY_INFO (f)->mouse_face_window);
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339

	  /* Find the first, and the last+1, lines affected by redisplay.  */
	  for (firstline = 0; firstline < f->height; firstline++)
	    if (FRAME_DESIRED_GLYPHS (f)->enable[firstline])
	      break;

	  lastline = f->height;
	  for (i = f->height - 1; i >= 0; i--)
	    {
	      if (FRAME_DESIRED_GLYPHS (f)->enable[i])
		break;
	      else
		lastline = i;
	    }

	  /* Can we tell that this update does not affect the window
340 341 342 343
	     where the mouse highlight is?  If so, no need to turn off.
	     Likewise, don't do anything if the frame is garbaged;
	     in that case, the FRAME_CURRENT_GLYPHS that we would use
	     are all wrong, and we will redisplay that line anyway.  */
344 345
	  if (! (firstline > (XFASTINT (w->top) + window_internal_height (w))
		 || lastline < XFASTINT (w->top)))
346
	    clear_mouse_face (FRAME_X_DISPLAY_INFO (f));
347
	}
348
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
349

Jim Blandy's avatar
Jim Blandy committed
350 351 352 353
  UNBLOCK_INPUT;
}

static
Jim Blandy's avatar
Jim Blandy committed
354 355
XTupdate_end (f)
     struct frame *f;
356
{
Jim Blandy's avatar
Jim Blandy committed
357 358 359 360
  int mask;

  BLOCK_INPUT;

361
  do_line_dance ();
Jim Blandy's avatar
Jim Blandy committed
362
  x_display_cursor (f, 1);
Jim Blandy's avatar
Jim Blandy committed
363

364 365
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
    FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 0;
366 367 368 369 370 371 372
#if 0
  /* This fails in the case of having updated only the echo area
     if we have switched buffers.  In that case, FRAME_CURRENT_GLYPHS
     has no relation to the current contents, and its charstarts
     have no relation to the contents of the window-buffer.
  I don't know a clean way to check
     for that case.  window_end_valid isn't set up yet.  */
373 374 375
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
    note_mouse_highlight (f, FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_x,
			  FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_y);
376 377
#endif

378
  XFlush (FRAME_X_DISPLAY (f));
Jim Blandy's avatar
Jim Blandy committed
379 380
  UNBLOCK_INPUT;
}
381

382
/* This is called after a redisplay on frame F.  */
383 384 385 386 387

static
XTframe_up_to_date (f)
     FRAME_PTR f;
{
388 389
  if (FRAME_X_DISPLAY_INFO (f)->mouse_face_deferred_gc
      || f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
390
    {
391 392 393 394
      note_mouse_highlight (FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame,
			    FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_x,
			    FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_y);
      FRAME_X_DISPLAY_INFO (f)->mouse_face_deferred_gc = 0;
395
    }
396
}
Jim Blandy's avatar
Jim Blandy committed
397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416

/* External interface to control of standout mode.
   Call this when about to modify line at position VPOS
   and not change whether it is highlighted.  */

XTreassert_line_highlight (new, vpos)
     int new, vpos;
{
  highlight = new;
}

/* Call this when about to modify line at position VPOS
   and change whether it is highlighted.  */

static
XTchange_line_highlight (new_highlight, vpos, first_unused_hpos)
     int new_highlight, vpos, first_unused_hpos;
{
  highlight = new_highlight;
  XTcursor_to (vpos, 0);
Jim Blandy's avatar
Jim Blandy committed
417
  XTclear_end_of_line (updating_frame->width);
Jim Blandy's avatar
Jim Blandy committed
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435
}

/* This is used when starting Emacs and when restarting after suspend.
   When starting Emacs, no X window is mapped.  And nothing must be done
   to Emacs's own window if it is suspended (though that rarely happens).  */

static
XTset_terminal_modes ()
{
}

/* This is called when exiting or suspending Emacs.
   Exiting will make the X-windows go away, and suspending
   requires no action.  */

static
XTreset_terminal_modes ()
{
Jim Blandy's avatar
Jim Blandy committed
436
/*  XTclear_frame ();  */
Jim Blandy's avatar
Jim Blandy committed
437 438
}

439 440
/* Set the nominal cursor position of the frame.
   This is where display update commands will take effect.
Jim Blandy's avatar
Jim Blandy committed
441 442
   This does not affect the place where the cursor-box is displayed.  */

Jim Blandy's avatar
Jim Blandy committed
443
static int
Jim Blandy's avatar
Jim Blandy committed
444 445 446 447 448 449 450 451 452
XTcursor_to (row, col)
     register int row, col;
{
  int mask;
  int orow = row;

  curs_x = col;
  curs_y = row;

Jim Blandy's avatar
Jim Blandy committed
453
  if (updating_frame == 0)
Jim Blandy's avatar
Jim Blandy committed
454 455
    {
      BLOCK_INPUT;
Jim Blandy's avatar
Jim Blandy committed
456
      x_display_cursor (selected_frame, 1);
457
      XFlush (FRAME_X_DISPLAY (selected_frame));
Jim Blandy's avatar
Jim Blandy committed
458 459 460 461 462 463
      UNBLOCK_INPUT;
    }
}

/* Display a sequence of N glyphs found at GP.
   WINDOW is the x-window to output to.  LEFT and TOP are starting coords.
464 465
   HL is 1 if this text is highlighted, 2 if the cursor is on it,
   3 if should appear in its mouse-face.
466 467
   JUST_FOREGROUND if 1 means draw only the foreground;
   don't alter the background.
Jim Blandy's avatar
Jim Blandy committed
468

469
   FONT is the default font to use (for glyphs whose font-code is 0).
Jim Blandy's avatar
Jim Blandy committed
470

471 472 473
   Since the display generation code is responsible for calling
   compute_char_face and compute_glyph_face on everything it puts in
   the display structure, we can assume that the face code on each
474
   glyph is a valid index into FRAME_COMPUTED_FACES (f), and the one
475 476
   to which we can actually apply intern_face.
   Call this function with input blocked.  */
Jim Blandy's avatar
Jim Blandy committed
477

478 479
#if 1
/* This is the multi-face code.  */
Jim Blandy's avatar
Jim Blandy committed
480 481

static void
482
dumpglyphs (f, left, top, gp, n, hl, just_foreground)
Jim Blandy's avatar
Jim Blandy committed
483
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
484 485 486 487
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
488
     int just_foreground;
Jim Blandy's avatar
Jim Blandy committed
489
{
490 491
  /* Holds characters to be displayed. */
  char *buf = (char *) alloca (f->width * sizeof (*buf));
Jim Blandy's avatar
Jim Blandy committed
492 493 494
  register char *cp;		/* Steps through buf[]. */
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
495
  Window window = FRAME_X_WINDOW (f);
496
  int orig_left = left;
Jim Blandy's avatar
Jim Blandy committed
497

498
  while (n > 0)
Jim Blandy's avatar
Jim Blandy committed
499 500 501 502 503
    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
      int g = *gp;

504
      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
505
      cf = FAST_GLYPH_FACE (g);
Jim Blandy's avatar
Jim Blandy committed
506 507 508 509 510 511 512

      /* Find the run of consecutive glyphs with the same face-code.
	 Extract their character codes into BUF.  */
      cp = buf;
      while (n > 0)
	{
	  g = *gp;
513
	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
514
	  if (FAST_GLYPH_FACE (g) != cf)
Jim Blandy's avatar
Jim Blandy committed
515 516
	    break;

517
	  *cp++ = FAST_GLYPH_CHAR (g);
Jim Blandy's avatar
Jim Blandy committed
518 519 520 521 522 523 524 525 526
	  --n;
	  ++gp;
	}

      /* LEN gets the length of the run.  */
      len = cp - buf;

      /* Now output this run of chars, with the font and pixel values
	 determined by the face code CF.  */
527 528
      {
	struct face *face = FRAME_DEFAULT_FACE (f);
529
	XFontStruct *font = FACE_FONT (face);
530
	GC gc = FACE_GC (face);
531
	int stippled = 0;
532

533 534
	/* HL = 3 means use a mouse face previously chosen.  */
	if (hl == 3)
535
	  cf = FRAME_X_DISPLAY_INFO (f)->mouse_face_face_id;
536

537 538
	/* First look at the face of the text itself.  */
	if (cf != 0)
539
	  {
540 541
	    /* It's possible for the display table to specify
	       a face code that is out of range.  Use 0 in that case.  */
542 543
	    if (cf < 0 || cf >= FRAME_N_COMPUTED_FACES (f)
		|| FRAME_COMPUTED_FACES (f) [cf] == 0)
544
	      cf = 0;
545 546 547 548

	    if (cf == 1)
	      face = FRAME_MODE_LINE_FACE (f);
	    else
549
	      face = intern_face (f, FRAME_COMPUTED_FACES (f) [cf]);
550 551
	    font = FACE_FONT (face);
	    gc = FACE_GC (face);
552 553
	    if (FACE_STIPPLE (face))
	      stippled = 1;
554
	  }
555 556

	/* Then comes the distinction between modeline and normal text.  */
557 558 559 560 561 562 563
	else if (hl == 0)
	  ;
	else if (hl == 1)
	  {
	    face = FRAME_MODE_LINE_FACE (f);
	    font = FACE_FONT (face);
	    gc   = FACE_GC   (face);
564 565
	    if (FACE_STIPPLE (face))
	      stippled = 1;
566 567 568 569 570
	  }

#define FACE_DEFAULT (~0)

	/* Now override that if the cursor's on this character.  */
571
	if (hl == 2)
572
	  {
573 574 575
	    /* The cursor overrides stippling.  */
	    stippled = 0;

576
	    if ((!face->font
577
		 || face->font == (XFontStruct *) FACE_DEFAULT
578 579 580
		 || face->font == f->display.x->font)
		&& face->background == f->display.x->background_pixel
		&& face->foreground == f->display.x->foreground_pixel)
581 582 583 584 585 586 587 588 589 590
	      {
		gc = f->display.x->cursor_gc;
	      }
	    /* Cursor on non-default face: must merge.  */
	    else
	      {
		XGCValues xgcv;
		unsigned long mask;

		xgcv.background = f->display.x->cursor_pixel;
591
		xgcv.foreground = face->background;
592 593 594
		/* If the glyph would be invisible,
		   try a different foreground.  */
		if (xgcv.foreground == xgcv.background)
595
		  xgcv.foreground = face->foreground;
596 597 598 599 600 601 602 603 604 605 606
		if (xgcv.foreground == xgcv.background)
		  xgcv.foreground = f->display.x->cursor_foreground_pixel;
		if (xgcv.foreground == xgcv.background)
		  xgcv.foreground = face->foreground;
		/* Make sure the cursor is distinct from text in this face.  */
		if (xgcv.background == face->background
		    && xgcv.foreground == face->foreground)
		  {
		    xgcv.background = face->foreground;
		    xgcv.foreground = face->background;
		  }
607 608 609
		xgcv.font = face->font->fid;
		xgcv.graphics_exposures = 0;
		mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
610 611 612 613
		if (FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc)
		  XChangeGC (FRAME_X_DISPLAY (f),
			     FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc,
			     mask, &xgcv);
614
		else
615
		  FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc
616
		    = XCreateGC (FRAME_X_DISPLAY (f), window, mask, &xgcv);
617
		gc = FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc;
618
#if 0
619 620
/* If this code is restored, it must also reset to the default stipple
   if necessary. */
621
		if (face->stipple && face->stipple != FACE_DEFAULT)
622
		  XSetStipple (FRAME_X_DISPLAY (f), gc, face->stipple);
623
#endif
624
	      }
625 626
	  }

627
	if (font == (XFontStruct *) FACE_DEFAULT)
628 629
	  font = f->display.x->font;

630
	if (just_foreground)
631
	  XDrawString (FRAME_X_DISPLAY (f), window, gc,
632 633 634
		       left, top + FONT_BASE (font), buf, len);
	else
	  {
635 636 637 638 639 640
	    if (stippled)
	      {
		/* Turn stipple on.  */
		XSetFillStyle (FRAME_X_DISPLAY (f), gc, FillOpaqueStippled);

		/* Draw stipple on background.  */
641
		XFillRectangle (FRAME_X_DISPLAY (f), window, gc,
642 643 644 645 646 647 648 649
				left, top,
				FONT_WIDTH (font) * len,
				FONT_HEIGHT (font));

		/* Turn stipple off.  */
		XSetFillStyle (FRAME_X_DISPLAY (f), gc, FillSolid);

		/* Draw the text, solidly, onto the stipple pattern.  */
650
		XDrawString (FRAME_X_DISPLAY (f), window, gc,
651 652 653
			     left, top + FONT_BASE (font), buf, len);
	      }
	    else
654
	      XDrawImageString (FRAME_X_DISPLAY (f), window, gc,
655 656
				left, top + FONT_BASE (font), buf, len);

657 658
	    /* Clear the rest of the line's height.  */
	    if (f->display.x->line_height != FONT_HEIGHT (font))
659
	      XClearArea (FRAME_X_DISPLAY (f), window, left,
660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
			  top + FONT_HEIGHT (font),
			  FONT_WIDTH (font) * len,
			  /* This is how many pixels of height
			     we have to clear.  */
			  f->display.x->line_height - FONT_HEIGHT (font),
			  False);
	  }

#if 0 /* Doesn't work, because it uses FRAME_CURRENT_GLYPHS,
	 which often is not up to date yet.  */
	if (!just_foreground)
	  {
	    if (left == orig_left)
	      redraw_previous_char (f, PIXEL_TO_CHAR_COL (f, left),
				    PIXEL_TO_CHAR_ROW (f, top), hl == 1);
	    if (n == 0)
	      redraw_following_char (f, PIXEL_TO_CHAR_COL (f, left + len * FONT_WIDTH (font)),
				     PIXEL_TO_CHAR_ROW (f, top), hl == 1);
	  }
#endif
680 681 682 683

	/* We should probably check for XA_UNDERLINE_POSITION and
	   XA_UNDERLINE_THICKNESS properties on the font, but let's
	   just get the thing working, and come back to that.  */
Jim Blandy's avatar
Jim Blandy committed
684
	{
685
	  int underline_position = 1;
686

687 688
	  if (font->descent <= underline_position)
	    underline_position = font->descent - 1;
689 690

	  if (face->underline)
691
	    XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
692 693 694 695 696
			    FACE_GC (face),
			    left, (top
				   + FONT_BASE (font)
				   + underline_position),
			    len * FONT_WIDTH (font), 1);
Jim Blandy's avatar
Jim Blandy committed
697
	}
698 699 700

	left += len * FONT_WIDTH (font);
      }
Jim Blandy's avatar
Jim Blandy committed
701 702
    }
}
703 704 705 706 707 708 709 710 711 712 713 714
#endif /* 1 */

#if 0
/* This is the old single-face code.  */

static void
dumpglyphs (f, left, top, gp, n, hl, font)
     struct frame *f;
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
715
     XFontStruct *font;
716 717 718 719 720 721 722 723
{
  register int len;
  Window window = FRAME_X_WINDOW (f);
  GC drawing_gc =   (hl == 2 ? f->display.x->cursor_gc
		             : (hl ? f->display.x->reverse_gc
				   : f->display.x->normal_gc));

  if (sizeof (GLYPH) == sizeof (XChar2b))
724
    XDrawImageString16 (FRAME_X_DISPLAY (f), window, drawing_gc,
725 726
			left, top + FONT_BASE (font), (XChar2b *) gp, n);
  else if (sizeof (GLYPH) == sizeof (unsigned char))
727
    XDrawImageString (FRAME_X_DISPLAY (f), window, drawing_gc,
728 729 730 731 732 733 734
		      left, top + FONT_BASE (font), (char *) gp, n);
  else
    /* What size of glyph ARE you using?  And does X have a function to
       draw them?  */
    abort ();
}
#endif
Jim Blandy's avatar
Jim Blandy committed
735

736 737
/* Output some text at the nominal frame cursor position.
   Advance the cursor over the text.
Jim Blandy's avatar
Jim Blandy committed
738 739 740 741 742 743 744 745 746 747 748 749
   Output LEN glyphs at START.

   `highlight', set up by XTreassert_line_highlight or XTchange_line_highlight,
   controls the pixel values used for foreground and background.  */

static
XTwrite_glyphs (start, len)
     register GLYPH *start;
     int len;
{
  register int temp_length;
  int mask;
Jim Blandy's avatar
Jim Blandy committed
750
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
751 752 753

  BLOCK_INPUT;

754
  do_line_dance ();
Jim Blandy's avatar
Jim Blandy committed
755 756
  f = updating_frame;
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
757
    {
Jim Blandy's avatar
Jim Blandy committed
758
      f = selected_frame;
Jim Blandy's avatar
Jim Blandy committed
759
      /* If not within an update,
Jim Blandy's avatar
Jim Blandy committed
760 761 762
	 output at the frame's visible cursor.  */
      curs_x = f->cursor_x;
      curs_y = f->cursor_y;
Jim Blandy's avatar
Jim Blandy committed
763 764
    }

Jim Blandy's avatar
Jim Blandy committed
765
  dumpglyphs (f,
766 767
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
768
	      start, len, highlight, 0);
Jim Blandy's avatar
Jim Blandy committed
769 770

  /* If we drew on top of the cursor, note that it is turned off.  */
Jim Blandy's avatar
Jim Blandy committed
771 772 773 774
  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && curs_x + len > f->phys_cursor_x)
    f->phys_cursor_x = -1;
775

Jim Blandy's avatar
Jim Blandy committed
776
  if (updating_frame == 0)
Jim Blandy's avatar
Jim Blandy committed
777
    {
Jim Blandy's avatar
Jim Blandy committed
778 779 780
      f->cursor_x += len;
      x_display_cursor (f, 1);
      f->cursor_x -= len;
Jim Blandy's avatar
Jim Blandy committed
781 782 783 784 785 786 787
    }
  else
    curs_x += len;

  UNBLOCK_INPUT;
}

788 789
/* Clear to the end of the line.
   Erase the current text line from the nominal cursor position (inclusive)
Jim Blandy's avatar
Jim Blandy committed
790 791
   to column FIRST_UNUSED (exclusive).  The idea is that everything
   from FIRST_UNUSED onward is already erased.  */
792

793
static
Jim Blandy's avatar
Jim Blandy committed
794 795 796
XTclear_end_of_line (first_unused)
     register int first_unused;
{
Jim Blandy's avatar
Jim Blandy committed
797
  struct frame *f = updating_frame;
Jim Blandy's avatar
Jim Blandy committed
798 799
  int mask;

Jim Blandy's avatar
Jim Blandy committed
800
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
801 802
    abort ();

Jim Blandy's avatar
Jim Blandy committed
803
  if (curs_y < 0 || curs_y >= f->height)
Jim Blandy's avatar
Jim Blandy committed
804 805 806 807
    return;
  if (first_unused <= 0)
    return;

Jim Blandy's avatar
Jim Blandy committed
808 809
  if (first_unused >= f->width)
    first_unused = f->width;
Jim Blandy's avatar
Jim Blandy committed
810 811 812

  BLOCK_INPUT;

813 814
  do_line_dance ();

Jim Blandy's avatar
Jim Blandy committed
815
  /* Notice if the cursor will be cleared by this operation.  */
Jim Blandy's avatar
Jim Blandy committed
816 817 818 819
  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && f->phys_cursor_x < first_unused)
    f->phys_cursor_x = -1;
Jim Blandy's avatar
Jim Blandy committed
820

821
  XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
822 823
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
Jim Blandy's avatar
Jim Blandy committed
824
	      FONT_WIDTH (f->display.x->font) * (first_unused - curs_x),
825
	      f->display.x->line_height, False);
826
#if 0
827
  redraw_previous_char (f, curs_x, curs_y, highlight);
828
#endif
Jim Blandy's avatar
Jim Blandy committed
829 830 831 832

  UNBLOCK_INPUT;
}

833 834 835 836 837 838 839 840 841 842 843 844
static
XTclear_frame ()
{
  int mask;
  struct frame *f = updating_frame;

  if (f == 0)
    f = selected_frame;

  f->phys_cursor_x = -1;	/* Cursor not visible.  */
  curs_x = 0;			/* Nominal cursor position is top left.  */
  curs_y = 0;
845

846 847
  BLOCK_INPUT;

848
  XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
849 850 851 852 853

  /* We have to clear the scroll bars, too.  If we have changed
     colors or something like that, then they should be notified.  */
  x_scroll_bar_clear (f);

854
  XFlush (FRAME_X_DISPLAY (f));
855 856 857 858 859 860 861 862 863 864 865 866
  UNBLOCK_INPUT;
}

#if 0
/* This currently does not work because FRAME_CURRENT_GLYPHS doesn't
   always contain the right glyphs to use.

   It also needs to be changed to look at the details of the font and
   see whether there is really overlap, and do nothing when there is
   not.  This can use font_char_overlap_left and font_char_overlap_right,
   but just how to use them is not clear.  */

867 868 869
/* Erase the character (if any) at the position just before X, Y in frame F,
   then redraw it and the character before it.
   This is necessary when we erase starting at X,
870 871
   in case the character after X overlaps into the one before X.
   Call this function with input blocked.  */
872 873

static void
874
redraw_previous_char (f, x, y, highlight_flag)
875 876
     FRAME_PTR f;
     int x, y;
877
     int highlight_flag;
878 879 880 881 882 883 884 885 886 887
{
  /* Erase the character before the new ones, in case
     what was here before overlaps it.
     Reoutput that character, and the previous character
     (in case the previous character overlaps it).  */
  if (x > 0)
    {
      int start_x = x - 2;
      if (start_x < 0)
	start_x = 0;
888
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
889 890 891
		  CHAR_TO_PIXEL_COL (f, x - 1),
		  CHAR_TO_PIXEL_ROW (f, y),
		  FONT_WIDTH (f->display.x->font),
892
		  f->display.x->line_height, False);
893 894 895 896

      dumpglyphs (f, CHAR_TO_PIXEL_COL (f, start_x),
		  CHAR_TO_PIXEL_ROW (f, y),
		  &FRAME_CURRENT_GLYPHS (f)->glyphs[y][start_x],
897
		  x - start_x, highlight_flag, 1);
898 899 900
    }
}

901 902 903 904 905 906 907 908 909 910 911
/* Erase the character (if any) at the position X, Y in frame F,
   then redraw it and the character after it.
   This is necessary when we erase endng at X,
   in case the character after X overlaps into the one before X.
   Call this function with input blocked.  */

static void
redraw_following_char (f, x, y, highlight_flag)
     FRAME_PTR f;
     int x, y;
     int highlight_flag;
Jim Blandy's avatar
Jim Blandy committed
912
{
913 914 915 916 917 918 919 920 921 922 923
  int limit = FRAME_CURRENT_GLYPHS (f)->used[y];
  /* Erase the character after the new ones, in case
     what was here before overlaps it.
     Reoutput that character, and the following character
     (in case the following character overlaps it).  */
  if (x < limit
      && FRAME_CURRENT_GLYPHS (f)->glyphs[y][x] != SPACEGLYPH)
    {
      int end_x = x + 2;
      if (end_x > limit)
	end_x = limit;
924
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
925 926 927 928
		  CHAR_TO_PIXEL_COL (f, x),
		  CHAR_TO_PIXEL_ROW (f, y),
		  FONT_WIDTH (f->display.x->font),
		  f->display.x->line_height, False);
Jim Blandy's avatar
Jim Blandy committed
929

930 931 932 933 934 935 936 937 938
      dumpglyphs (f, CHAR_TO_PIXEL_COL (f, x),
		  CHAR_TO_PIXEL_ROW (f, y),
		  &FRAME_CURRENT_GLYPHS (f)->glyphs[y][x],
		  end_x - x, highlight_flag, 1);
    }
}
#endif /* 0 */

#if 0 /* Not in use yet */
Jim Blandy's avatar
Jim Blandy committed
939

940
/* Return 1 if character C in font F extends past its left edge.  */
Jim Blandy's avatar
Jim Blandy committed
941

942 943 944 945 946 947
static int
font_char_overlap_left (font, c)
     XFontStruct *font;
     int c;
{
  XCharStruct *s;
Jim Blandy's avatar
Jim Blandy committed
948

949 950 951 952 953 954 955
  /* Find the bounding-box info for C.  */
  if (font->per_char == 0)
    s = &font->max_bounds;
  else
    {
      int rowlen = font->max_char_or_byte2 - font->min_char_or_byte2 + 1;
      int row, within;
956

957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
      /* Decode char into row number (byte 1) and code within row (byte 2).  */
      row = c >> 8;
      within = c & 0177;
      if (!(within >= font->min_char_or_byte2
	    && within <= font->max_char_or_byte2
	    && row >= font->min_byte1
	    && row <= font->max_byte1))
	{
	  /* If char is out of range, try the font's default char instead.  */
	  c = font->default_char;
	  row = c >> (INTBITS - 8);
	  within = c & 0177;
	}
      if (!(within >= font->min_char_or_byte2
	    && within <= font->max_char_or_byte2
	    && row >= font->min_byte1
	    && row <= font->max_byte1))
	/* Still out of range means this char does not overlap.  */
	return 0;
      else
	/* We found the info for this char.  */
	s = (font->per_char + (within - font->min_char_or_byte2)
	     + row * rowlen);
    }
Jim Blandy's avatar
Jim Blandy committed
981

982 983
  return (s && s->lbearing < 0);
}
Jim Blandy's avatar
Jim Blandy committed
984

985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
/* Return 1 if character C in font F extends past its right edge.  */

static int
font_char_overlap_right (font, c)
     XFontStruct *font;
     int c;
{
  XCharStruct *s;

  /* Find the bounding-box info for C.  */
  if (font->per_char == 0)
    s = &font->max_bounds;
  else
    {
      int rowlen = font->max_char_or_byte2 - font->min_char_or_byte2 + 1;
      int row, within;
1001

1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
      /* Decode char into row number (byte 1) and code within row (byte 2).  */
      row = c >> 8;
      within = c & 0177;
      if (!(within >= font->min_char_or_byte2
	    && within <= font->max_char_or_byte2
	    && row >= font->min_byte1
	    && row <= font->max_byte1))
	{
	  /* If char is out of range, try the font's default char instead.  */
	  c = font->default_char;
	  row = c >> (INTBITS - 8);
	  within = c & 0177;
	}
      if (!(within >= font->min_char_or_byte2
	    && within <= font->max_char_or_byte2
	    && row >= font->min_byte1
	    && row <= font->max_byte1))
	/* Still out of range means this char does not overlap.  */
	return 0;
      else
	/* We found the info for this char.  */
	s = (font->per_char + (within - font->min_char_or_byte2)
	     + row * rowlen);
    }

  return (s && s->rbearing >= s->width);
Jim Blandy's avatar
Jim Blandy committed
1028
}
1029
#endif /* 0 */
Jim Blandy's avatar
Jim Blandy committed
1030

Jim Blandy's avatar
Jim Blandy committed
1031 1032 1033
/* Invert the middle quarter of the frame for .15 sec.  */

/* We use the select system call to do the waiting, so we have to make sure
1034
   it's available.  If it isn't, we just won't do visual bells.  */
Jim Blandy's avatar
Jim Blandy committed
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)

/* Subtract the `struct timeval' values X and Y,
   storing the result in RESULT.
   Return 1 if the difference is negative, otherwise 0.  */

static int
timeval_subtract (result, x, y)
     struct timeval *result, x, y;
{
  /* Perform the carry for the later subtraction by updating y.
     This is safer because on some systems
     the tv_sec member is unsigned.  */
  if (x.tv_usec < y.tv_usec)
    {
      int nsec = (y.tv_usec - x.tv_usec) / 1000000 + 1;
      y.tv_usec -= 1000000 * nsec;
      y.tv_sec += nsec;
    }
  if (x.tv_usec - y.tv_usec > 1000000)
    {
      int nsec = (y.tv_usec - x.tv_usec) / 1000000;
      y.tv_usec += 1000000 * nsec;
      y.tv_sec -= nsec;
    }

  /* Compute the time remaining to wait.  tv_usec is certainly positive.  */
  result->tv_sec = x.tv_sec - y.tv_sec;
  result->tv_usec = x.tv_usec - y.tv_usec;

  /* Return indication of whether the result should be considered negative.  */
  return x.tv_sec < y.tv_sec;
}
Jim Blandy's avatar
Jim Blandy committed
1068

Jim Blandy's avatar
Jim Blandy committed
1069 1070
XTflash (f)
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
1071
{
Jim Blandy's avatar
Jim Blandy committed
1072
  BLOCK_INPUT;
Jim Blandy's avatar
Jim Blandy committed
1073

Jim Blandy's avatar
Jim Blandy committed
1074 1075
  {
    GC gc;
Jim Blandy's avatar
Jim Blandy committed
1076

Jim Blandy's avatar
Jim Blandy committed
1077 1078 1079 1080
    /* Create a GC that will use the GXxor function to flip foreground pixels
       into background pixels.  */
    {
      XGCValues values;
Jim Blandy's avatar
Jim Blandy committed
1081

Jim Blandy's avatar
Jim Blandy committed
1082 1083 1084
      values.function = GXxor;
      values.foreground = (f->display.x->foreground_pixel
			   ^ f->display.x->background_pixel);
1085

1086
      gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
Jim Blandy's avatar
Jim Blandy committed
1087 1088
		      GCFunction | GCForeground, &values);
    }
Jim Blandy's avatar
Jim Blandy committed
1089

Jim Blandy's avatar
Jim Blandy committed
1090 1091 1092
    {
      int width  = PIXEL_WIDTH  (f);
      int height = PIXEL_HEIGHT (f);
Jim Blandy's avatar
Jim Blandy committed
1093

1094
      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
Jim Blandy's avatar
Jim Blandy committed
1095
		      width/4, height/4, width/2, height/2);
1096
      XFlush (FRAME_X_DISPLAY (f));
Jim Blandy's avatar
Jim Blandy committed
1097

Jim Blandy's avatar
Jim Blandy committed
1098 1099
      {
	struct timeval wakeup, now;
Jim Blandy's avatar
Jim Blandy committed
1100

1101
	EMACS_GET_TIME (wakeup);
Jim Blandy's avatar
Jim Blandy committed
1102

Jim Blandy's avatar
Jim Blandy committed
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	/* Compute time to wait until, propagating carry from usecs.  */
	wakeup.tv_usec += 150000;
	wakeup.tv_sec += (wakeup.tv_usec / 1000000);
	wakeup.tv_usec %= 1000000;

	/* Keep waiting until past the time wakeup.  */
	while (1)
	  {
	    struct timeval timeout;

1113
	    EMACS_GET_TIME (timeout);
Jim Blandy's avatar
Jim Blandy committed
1114 1115 1116 1117 1118 1119 1120

	    /* In effect, timeout = wakeup - timeout.
	       Break if result would be negative.  */
	    if (timeval_subtract (&timeout, wakeup, timeout))
	      break;

	    /* Try to wait that long--but we might wake up sooner.  */
1121
	    select (0, NULL, NULL, NULL, &timeout);
Jim Blandy's avatar
Jim Blandy committed
1122 1123
	  }
      }
1124

1125
      XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,</