xterm.c 174 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
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
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
20

21 22
/* Xt features made by Fred Pierresteguy.  */

23 24 25 26 27
/* 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>

28
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
29

30 31
#include <stdio.h>

32
/* Need syssignal.h for various externs and definitions that may be required
33
   by some configurations for calls to signal later in this source file.  */
34 35
#include "syssignal.h"

Jim Blandy's avatar
Jim Blandy committed
36 37 38
#ifdef HAVE_X_WINDOWS

#include "lisp.h"
39
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
40 41 42 43

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"
44
#include <X11/cursorfont.h>
Jim Blandy's avatar
Jim Blandy committed
45

46
#ifndef USG
Jim Blandy's avatar
Jim Blandy committed
47 48 49 50
/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
51 52
#endif /* makedev */
#endif /* USG */
Jim Blandy's avatar
Jim Blandy committed
53 54 55

#ifdef BSD
#include <sys/ioctl.h>
56
#endif /* ! defined (BSD) */
Jim Blandy's avatar
Jim Blandy committed
57

58
#include "systty.h"
Jim Blandy's avatar
Jim Blandy committed
59
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
60

61
#ifndef INCLUDED_FCNTL
Jim Blandy's avatar
Jim Blandy committed
62
#include <fcntl.h>
63
#endif
Jim Blandy's avatar
Jim Blandy committed
64 65 66 67
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <sys/stat.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
68 69
/* Caused redefinition of DBL_DIG on Netbsd; seems not to be needed.  */
/* #include <sys/param.h>  */
Jim Blandy's avatar
Jim Blandy committed
70

71
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
72 73 74 75 76 77 78
#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
79
#endif /* ! 0 */
Jim Blandy's avatar
Jim Blandy committed
80 81 82
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
83
#include "window.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
84
#include "keyboard.h"
Karl Heuer's avatar
Karl Heuer committed
85
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
86

87
#ifdef USE_X_TOOLKIT
88
extern void free_frame_menubar ();
89
extern FRAME_PTR x_menubar_window_to_frame ();
90 91 92 93
#if (XtSpecificationRelease >= 5) && !defined(NO_EDITRES)
#define HACK_EDITRES
extern void _XEditResCheckMessages ();
#endif /* not NO_EDITRES */
94 95
#endif /* USE_X_TOOLKIT */

96 97
#ifndef USE_X_TOOLKIT
#define x_any_window_to_frame x_window_to_frame
98
#define x_top_window_to_frame x_window_to_frame
99 100
#endif

101
#ifdef USE_X_TOOLKIT
Karl Heuer's avatar
Karl Heuer committed
102
#include "widget.h"
103 104 105 106 107
#ifndef XtNinitialState
#define XtNinitialState "initialState"
#endif
#endif

Karl Heuer's avatar
Karl Heuer committed
108 109 110 111 112
#ifdef HAVE_X11XTR6
/* So we can do setlocale.  */
#include <locale.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
113 114
#define min(a,b) ((a)<(b) ? (a) : (b))
#define max(a,b) ((a)>(b) ? (a) : (b))
115

116 117
/* 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
118

119 120 121 122 123
/* 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;
124

125
/* Frame being updated by update_frame.  This is declared in term.c.
126
   This is set by update_begin and looked at by all the
Jim Blandy's avatar
Jim Blandy committed
127
   XT functions.  It is zero while not inside an update.
Jim Blandy's avatar
Jim Blandy committed
128 129
   In that case, the XT functions assume that `selected_frame'
   is the frame to apply to.  */
130
extern struct frame *updating_frame;
Jim Blandy's avatar
Jim Blandy committed
131

132 133 134
/* This is a frame waiting to be autoraised, within XTread_socket.  */
struct frame *pending_autoraise_frame;

135 136 137
#ifdef USE_X_TOOLKIT
/* The application context for Xt use.  */
XtAppContext Xt_app_con;
138 139 140 141 142

static String Xt_default_resources[] =
{
  0
};
143 144
#endif

Jim Blandy's avatar
Jim Blandy committed
145 146 147 148 149 150 151 152 153 154 155 156 157 158
/* 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;

159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
/* 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;

200 201 202 203 204 205 206
/* 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

207 208
/* Used locally within XTread_socket.  */
static int x_noop_count;
Jim Blandy's avatar
Jim Blandy committed
209

210 211 212
/* Initial values of argv and argc.  */
extern char **initial_argv;
extern int initial_argc;
Jim Blandy's avatar
Jim Blandy committed
213

214
extern Lisp_Object Vcommand_line_args, Vsystem_name;
Jim Blandy's avatar
Jim Blandy committed
215

216 217 218
/* Tells if a window manager is present or not. */

extern Lisp_Object Vx_no_window_manager;
Jim Blandy's avatar
Jim Blandy committed
219 220 221 222

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

223
extern Lisp_Object Qface, Qmouse_face;
224

Jim Blandy's avatar
Jim Blandy committed
225 226
extern int errno;

227
/* A mask of extra modifier bits to put into every keyboard char.  */
228 229
extern int extra_keyboard_modifiers;

230 231
static Lisp_Object Qvendor_specific_keysyms;

232
extern XrmDatabase x_load_resources ();
Jim Blandy's avatar
Jim Blandy committed
233

234 235
extern Lisp_Object x_icon_type ();

236 237
void x_delete_display ();

238
static void redraw_previous_char ();
239
static void redraw_following_char ();
240
static unsigned int x_x_to_emacs_modifiers ();
Jim Blandy's avatar
Jim Blandy committed
241

242
static int fast_find_position ();
243 244 245
static void note_mouse_highlight ();
static void clear_mouse_face ();
static void show_mouse_face ();
246
static void do_line_dance ();
247

Jim Blandy's avatar
Jim Blandy committed
248 249
static int XTcursor_to ();
static int XTclear_end_of_line ();
250
static int x_io_error_quitter ();
251 252
void x_catch_errors ();
void x_uncatch_errors ();
253

254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
#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 */

282 283 284 285 286 287 288 289 290 291 292
/* 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;
293

294 295
  return 0;
}
Jim Blandy's avatar
Jim Blandy committed
296

297
/* Starting and ending updates.
298 299

   These hooks are called by update_frame at the beginning and end
Jim Blandy's avatar
Jim Blandy committed
300 301 302
   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
303
   should never be called except during an update, the only exceptions
304
   being XTcursor_to, XTwrite_glyphs and XTreassert_line_highlight.  */
Jim Blandy's avatar
Jim Blandy committed
305 306

static
Jim Blandy's avatar
Jim Blandy committed
307 308
XTupdate_begin (f)
     struct frame *f;
309
{
Jim Blandy's avatar
Jim Blandy committed
310 311
  int mask;

Jim Blandy's avatar
Jim Blandy committed
312
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
313 314
    abort ();

Jim Blandy's avatar
Jim Blandy committed
315
  flexlines = f->height;
Jim Blandy's avatar
Jim Blandy committed
316 317 318
  highlight = 0;

  BLOCK_INPUT;
319

320
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
321
    {
322
      /* Don't do highlighting for mouse motion during the update.  */
323
      FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 1;
324 325 326

      /* If the frame needs to be redrawn,
	 simply forget about any prior mouse highlighting.  */
327
      if (FRAME_GARBAGED_P (f))
328 329
	FRAME_X_DISPLAY_INFO (f)->mouse_face_window = Qnil;

330
      if (!NILP (FRAME_X_DISPLAY_INFO (f)->mouse_face_window))
331 332
	{
	  int firstline, lastline, i;
333
	  struct window *w = XWINDOW (FRAME_X_DISPLAY_INFO (f)->mouse_face_window);
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349

	  /* 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
350 351 352 353
	     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.  */
354 355
	  if (! (firstline > (XFASTINT (w->top) + window_internal_height (w))
		 || lastline < XFASTINT (w->top)))
356
	    clear_mouse_face (FRAME_X_DISPLAY_INFO (f));
357
	}
358
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
359

Jim Blandy's avatar
Jim Blandy committed
360 361 362 363
  UNBLOCK_INPUT;
}

static
Jim Blandy's avatar
Jim Blandy committed
364 365
XTupdate_end (f)
     struct frame *f;
366
{
Jim Blandy's avatar
Jim Blandy committed
367 368 369 370
  int mask;

  BLOCK_INPUT;

371
  do_line_dance ();
Jim Blandy's avatar
Jim Blandy committed
372
  x_display_cursor (f, 1);
Jim Blandy's avatar
Jim Blandy committed
373

374 375
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
    FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 0;
376 377 378 379 380 381 382
#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.  */
383 384 385
  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);
386 387
#endif

388
  XFlush (FRAME_X_DISPLAY (f));
Jim Blandy's avatar
Jim Blandy committed
389 390
  UNBLOCK_INPUT;
}
391

392
/* This is called after a redisplay on frame F.  */
393 394 395 396 397

static
XTframe_up_to_date (f)
     FRAME_PTR f;
{
398
  BLOCK_INPUT;
399 400
  if (FRAME_X_DISPLAY_INFO (f)->mouse_face_deferred_gc
      || f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
401
    {
402 403 404 405
      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;
406
    }
407
  UNBLOCK_INPUT;
408
}
Jim Blandy's avatar
Jim Blandy committed
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428

/* 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
429
  XTclear_end_of_line (updating_frame->width);
Jim Blandy's avatar
Jim Blandy committed
430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
}

/* 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
448
/*  XTclear_frame ();  */
Jim Blandy's avatar
Jim Blandy committed
449 450
}

451 452
/* Set the nominal cursor position of the frame.
   This is where display update commands will take effect.
Jim Blandy's avatar
Jim Blandy committed
453 454
   This does not affect the place where the cursor-box is displayed.  */

Jim Blandy's avatar
Jim Blandy committed
455
static int
Jim Blandy's avatar
Jim Blandy committed
456 457 458 459 460 461 462 463 464
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
465
  if (updating_frame == 0)
Jim Blandy's avatar
Jim Blandy committed
466 467
    {
      BLOCK_INPUT;
Jim Blandy's avatar
Jim Blandy committed
468
      x_display_cursor (selected_frame, 1);
469
      XFlush (FRAME_X_DISPLAY (selected_frame));
Jim Blandy's avatar
Jim Blandy committed
470 471 472 473 474 475
      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.
476 477
   HL is 1 if this text is highlighted, 2 if the cursor is on it,
   3 if should appear in its mouse-face.
478 479
   JUST_FOREGROUND if 1 means draw only the foreground;
   don't alter the background.
Jim Blandy's avatar
Jim Blandy committed
480

481
   FONT is the default font to use (for glyphs whose font-code is 0).
Jim Blandy's avatar
Jim Blandy committed
482

483 484 485
   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
486
   glyph is a valid index into FRAME_COMPUTED_FACES (f), and the one
487 488
   to which we can actually apply intern_face.
   Call this function with input blocked.  */
Jim Blandy's avatar
Jim Blandy committed
489

490 491
#if 1
/* This is the multi-face code.  */
Jim Blandy's avatar
Jim Blandy committed
492 493

static void
494
dumpglyphs (f, left, top, gp, n, hl, just_foreground)
Jim Blandy's avatar
Jim Blandy committed
495
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
496 497 498 499
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
500
     int just_foreground;
Jim Blandy's avatar
Jim Blandy committed
501
{
502 503
  /* Holds characters to be displayed. */
  char *buf = (char *) alloca (f->width * sizeof (*buf));
Jim Blandy's avatar
Jim Blandy committed
504 505 506
  register char *cp;		/* Steps through buf[]. */
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
507
  Window window = FRAME_X_WINDOW (f);
508
  int orig_left = left;
Jim Blandy's avatar
Jim Blandy committed
509

510
  while (n > 0)
Jim Blandy's avatar
Jim Blandy committed
511 512 513 514 515
    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
      int g = *gp;

516
      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
517
      cf = FAST_GLYPH_FACE (g);
Jim Blandy's avatar
Jim Blandy committed
518 519 520 521 522 523 524

      /* Find the run of consecutive glyphs with the same face-code.
	 Extract their character codes into BUF.  */
      cp = buf;
      while (n > 0)
	{
	  g = *gp;
525
	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
526
	  if (FAST_GLYPH_FACE (g) != cf)
Jim Blandy's avatar
Jim Blandy committed
527 528
	    break;

529
	  *cp++ = FAST_GLYPH_CHAR (g);
Jim Blandy's avatar
Jim Blandy committed
530 531 532 533 534 535 536 537 538
	  --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.  */
539 540
      {
	struct face *face = FRAME_DEFAULT_FACE (f);
541
	XFontStruct *font = FACE_FONT (face);
542
	GC gc = FACE_GC (face);
543
	int stippled = 0;
544

545 546
	/* HL = 3 means use a mouse face previously chosen.  */
	if (hl == 3)
547
	  cf = FRAME_X_DISPLAY_INFO (f)->mouse_face_face_id;
548

549 550
	/* First look at the face of the text itself.  */
	if (cf != 0)
551
	  {
552 553
	    /* It's possible for the display table to specify
	       a face code that is out of range.  Use 0 in that case.  */
554 555
	    if (cf < 0 || cf >= FRAME_N_COMPUTED_FACES (f)
		|| FRAME_COMPUTED_FACES (f) [cf] == 0)
556
	      cf = 0;
557 558 559 560

	    if (cf == 1)
	      face = FRAME_MODE_LINE_FACE (f);
	    else
561
	      face = intern_face (f, FRAME_COMPUTED_FACES (f) [cf]);
562 563
	    font = FACE_FONT (face);
	    gc = FACE_GC (face);
564 565
	    if (FACE_STIPPLE (face))
	      stippled = 1;
566
	  }
567 568

	/* Then comes the distinction between modeline and normal text.  */
569 570 571 572 573 574 575
	else if (hl == 0)
	  ;
	else if (hl == 1)
	  {
	    face = FRAME_MODE_LINE_FACE (f);
	    font = FACE_FONT (face);
	    gc   = FACE_GC   (face);
576 577
	    if (FACE_STIPPLE (face))
	      stippled = 1;
578 579 580 581 582
	  }

#define FACE_DEFAULT (~0)

	/* Now override that if the cursor's on this character.  */
583
	if (hl == 2)
584
	  {
585 586 587
	    /* The cursor overrides stippling.  */
	    stippled = 0;

588
	    if ((!face->font
589
		 || face->font == (XFontStruct *) FACE_DEFAULT
590 591 592
		 || face->font == f->output_data.x->font)
		&& face->background == f->output_data.x->background_pixel
		&& face->foreground == f->output_data.x->foreground_pixel)
593
	      {
594
		gc = f->output_data.x->cursor_gc;
595 596 597 598 599 600 601
	      }
	    /* Cursor on non-default face: must merge.  */
	    else
	      {
		XGCValues xgcv;
		unsigned long mask;

602
		xgcv.background = f->output_data.x->cursor_pixel;
603
		xgcv.foreground = face->background;
604 605 606
		/* If the glyph would be invisible,
		   try a different foreground.  */
		if (xgcv.foreground == xgcv.background)
607
		  xgcv.foreground = face->foreground;
608
		if (xgcv.foreground == xgcv.background)
609
		  xgcv.foreground = f->output_data.x->cursor_foreground_pixel;
610 611 612 613 614 615 616 617 618
		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;
		  }
619 620 621
		xgcv.font = face->font->fid;
		xgcv.graphics_exposures = 0;
		mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
622 623 624 625
		if (FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc)
		  XChangeGC (FRAME_X_DISPLAY (f),
			     FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc,
			     mask, &xgcv);
626
		else
627
		  FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc
628
		    = XCreateGC (FRAME_X_DISPLAY (f), window, mask, &xgcv);
629
		gc = FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc;
630
#if 0
631 632
/* If this code is restored, it must also reset to the default stipple
   if necessary. */
633
		if (face->stipple && face->stipple != FACE_DEFAULT)
634
		  XSetStipple (FRAME_X_DISPLAY (f), gc, face->stipple);
635
#endif
636
	      }
637 638
	  }

639
	if (font == (XFontStruct *) FACE_DEFAULT)
640
	  font = f->output_data.x->font;
641

642
	if (just_foreground)
643
	  XDrawString (FRAME_X_DISPLAY (f), window, gc,
644 645 646
		       left, top + FONT_BASE (font), buf, len);
	else
	  {
647 648 649 650 651 652
	    if (stippled)
	      {
		/* Turn stipple on.  */
		XSetFillStyle (FRAME_X_DISPLAY (f), gc, FillOpaqueStippled);

		/* Draw stipple on background.  */
653
		XFillRectangle (FRAME_X_DISPLAY (f), window, gc,
654 655 656 657 658 659 660 661
				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.  */
662
		XDrawString (FRAME_X_DISPLAY (f), window, gc,
663 664 665
			     left, top + FONT_BASE (font), buf, len);
	      }
	    else
666
	      XDrawImageString (FRAME_X_DISPLAY (f), window, gc,
667 668
				left, top + FONT_BASE (font), buf, len);

669
	    /* Clear the rest of the line's height.  */
670
	    if (f->output_data.x->line_height != FONT_HEIGHT (font))
671
	      XClearArea (FRAME_X_DISPLAY (f), window, left,
672 673 674 675
			  top + FONT_HEIGHT (font),
			  FONT_WIDTH (font) * len,
			  /* This is how many pixels of height
			     we have to clear.  */
676
			  f->output_data.x->line_height - FONT_HEIGHT (font),
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691
			  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
692 693 694 695

	/* 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
696
	{
697
	  int underline_position = 1;
698

699 700
	  if (font->descent <= underline_position)
	    underline_position = font->descent - 1;
701 702

	  if (face->underline)
703
	    XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
704 705 706 707 708
			    FACE_GC (face),
			    left, (top
				   + FONT_BASE (font)
				   + underline_position),
			    len * FONT_WIDTH (font), 1);
Jim Blandy's avatar
Jim Blandy committed
709
	}
710 711 712

	left += len * FONT_WIDTH (font);
      }
Jim Blandy's avatar
Jim Blandy committed
713 714
    }
}
715 716 717 718 719 720 721 722 723 724 725 726
#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;
727
     XFontStruct *font;
728 729 730
{
  register int len;
  Window window = FRAME_X_WINDOW (f);
731 732 733
  GC drawing_gc =   (hl == 2 ? f->output_data.x->cursor_gc
		             : (hl ? f->output_data.x->reverse_gc
				   : f->output_data.x->normal_gc));
734 735

  if (sizeof (GLYPH) == sizeof (XChar2b))
736
    XDrawImageString16 (FRAME_X_DISPLAY (f), window, drawing_gc,
737 738
			left, top + FONT_BASE (font), (XChar2b *) gp, n);
  else if (sizeof (GLYPH) == sizeof (unsigned char))
739
    XDrawImageString (FRAME_X_DISPLAY (f), window, drawing_gc,
740 741 742 743 744 745 746
		      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
747

748 749
/* Output some text at the nominal frame cursor position.
   Advance the cursor over the text.
Jim Blandy's avatar
Jim Blandy committed
750 751 752 753 754 755 756 757 758 759 760 761
   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
762
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
763 764 765

  BLOCK_INPUT;

766
  do_line_dance ();
Jim Blandy's avatar
Jim Blandy committed
767 768
  f = updating_frame;
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
769
    {
Jim Blandy's avatar
Jim Blandy committed
770
      f = selected_frame;
Jim Blandy's avatar
Jim Blandy committed
771
      /* If not within an update,
Jim Blandy's avatar
Jim Blandy committed
772 773 774
	 output at the frame's visible cursor.  */
      curs_x = f->cursor_x;
      curs_y = f->cursor_y;
Jim Blandy's avatar
Jim Blandy committed
775 776
    }

Jim Blandy's avatar
Jim Blandy committed
777
  dumpglyphs (f,
778 779
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
780
	      start, len, highlight, 0);
Jim Blandy's avatar
Jim Blandy committed
781 782

  /* If we drew on top of the cursor, note that it is turned off.  */
Jim Blandy's avatar
Jim Blandy committed
783 784 785 786
  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;
787

Jim Blandy's avatar
Jim Blandy committed
788
  if (updating_frame == 0)
Jim Blandy's avatar
Jim Blandy committed
789
    {
Jim Blandy's avatar
Jim Blandy committed
790 791 792
      f->cursor_x += len;
      x_display_cursor (f, 1);
      f->cursor_x -= len;
Jim Blandy's avatar
Jim Blandy committed
793 794 795 796 797 798 799
    }
  else
    curs_x += len;

  UNBLOCK_INPUT;
}

800 801
/* 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
802 803
   to column FIRST_UNUSED (exclusive).  The idea is that everything
   from FIRST_UNUSED onward is already erased.  */
804

805
static
Jim Blandy's avatar
Jim Blandy committed
806 807 808
XTclear_end_of_line (first_unused)
     register int first_unused;
{
Jim Blandy's avatar
Jim Blandy committed
809
  struct frame *f = updating_frame;
Jim Blandy's avatar
Jim Blandy committed
810 811
  int mask;

Jim Blandy's avatar
Jim Blandy committed
812
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
813 814
    abort ();

Jim Blandy's avatar
Jim Blandy committed
815
  if (curs_y < 0 || curs_y >= f->height)
Jim Blandy's avatar
Jim Blandy committed
816 817 818 819
    return;
  if (first_unused <= 0)
    return;

Jim Blandy's avatar
Jim Blandy committed
820 821
  if (first_unused >= f->width)
    first_unused = f->width;
Jim Blandy's avatar
Jim Blandy committed
822 823 824

  BLOCK_INPUT;

825 826
  do_line_dance ();

Jim Blandy's avatar
Jim Blandy committed
827
  /* Notice if the cursor will be cleared by this operation.  */
Jim Blandy's avatar
Jim Blandy committed
828 829 830 831
  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
832

833
  XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
834 835
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
836 837
	      FONT_WIDTH (f->output_data.x->font) * (first_unused - curs_x),
	      f->output_data.x->line_height, False);
838
#if 0
839
  redraw_previous_char (f, curs_x, curs_y, highlight);
840
#endif
Jim Blandy's avatar
Jim Blandy committed
841 842 843 844

  UNBLOCK_INPUT;
}

845 846 847 848 849 850 851 852 853 854 855 856
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;
857

858 859
  BLOCK_INPUT;

860
  XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
861 862 863 864 865

  /* 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);

866
  XFlush (FRAME_X_DISPLAY (f));
867 868 869 870 871 872 873 874 875 876 877 878
  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.  */

879 880 881
/* 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,
882 883
   in case the character after X overlaps into the one before X.
   Call this function with input blocked.  */
884 885

static void
886
redraw_previous_char (f, x, y, highlight_flag)
887 888
     FRAME_PTR f;
     int x, y;
889
     int highlight_flag;
890 891 892 893 894 895 896 897 898 899
{
  /* 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;
900
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
901 902
		  CHAR_TO_PIXEL_COL (f, x - 1),
		  CHAR_TO_PIXEL_ROW (f, y),
903 904
		  FONT_WIDTH (f->output_data.x->font),
		  f->output_data.x->line_height, False);
905 906 907 908

      dumpglyphs (f, CHAR_TO_PIXEL_COL (f, start_x),
		  CHAR_TO_PIXEL_ROW (f, y),
		  &FRAME_CURRENT_GLYPHS (f)->glyphs[y][start_x],
909
		  x - start_x, highlight_flag, 1);
910 911 912
    }
}

913 914 915 916 917 918 919 920 921 922 923
/* 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
924
{
925 926 927 928 929 930 931 932 933 934 935
  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;
936
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
937 938
		  CHAR_TO_PIXEL_COL (f, x),
		  CHAR_TO_PIXEL_ROW (f, y),
939 940
		  FONT_WIDTH (f->output_data.x->font),
		  f->output_data.x->line_height, False);
Jim Blandy's avatar
Jim Blandy committed
941

942 943 944 945 946 947 948 949 950
      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
951

952
/* Return 1 if character C in font F extends past its left edge.  */
Jim Blandy's avatar
Jim Blandy committed
953

954 955 956 957 958 959
static int
font_char_overlap_left (font, c)
     XFontStruct *font;
     int c;
{
  XCharStruct *s;
Jim Blandy's avatar
Jim Blandy committed
960

961 962 963 964 965 966 967
  /* 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;
968

969 970 971 972 973 974 975 976 977 978
      /* 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;
979
	  row = c >> (BITS_PER_INT - 8);
980 981 982 983 984 985 986 987 988 989 990 991 992
	  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
993

994 995
  return (s && s->lbearing < 0);
}
Jim Blandy's avatar
Jim Blandy committed
996

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
/* 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;
1013

1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
      /* 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;
1024
	  row = c >> (BITS_PER_INT - 8);
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
	  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
1040
}
1041
#endif /* 0 */
Jim Blandy's avatar
Jim Blandy committed
1042

Jim Blandy's avatar
Jim Blandy committed
1043 1044 1045
/* 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
1046
   it's available.  If it isn't, we just won't do visual bells.  */
Jim Blandy's avatar
Jim Blandy committed
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
#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
1080

Jim Blandy's avatar
Jim Blandy committed
1081 1082
XTflash (f)
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
1083
{
Jim Blandy's avatar
Jim Blandy committed
1084
  BLOCK_INPUT;
Jim Blandy's avatar
Jim Blandy committed
1085

Jim Blandy's avatar
Jim Blandy committed
1086 1087
  {
    GC gc;
Jim Blandy's avatar
Jim Blandy committed
1088

Jim Blandy's avatar