xterm.c 195 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* X Communication module for terminals which understand the X protocol.
2
   Copyright (C) 1989, 93, 94, 95, 1996 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
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
55
#include <sys/ioctl.h>
56
#endif /* ! defined (BSD_SYSTEM) */
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 72 73
#include "charset.h"
#include "ccl.h"
#include "fontset.h"
74
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
75 76 77 78 79 80 81
#include "dispextern.h"
#include "termhooks.h"
#include "termopts.h"
#include "termchar.h"
#if 0
#include "sink.h"
#include "sinkmask.h"
82
#endif /* ! 0 */
Jim Blandy's avatar
Jim Blandy committed
83 84 85
#include "gnu.h"
#include "disptab.h"
#include "buffer.h"
86
#include "window.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
87
#include "keyboard.h"
Karl Heuer's avatar
Karl Heuer committed
88
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
89

90 91 92 93
#ifdef USE_X_TOOLKIT
#include <X11/Shell.h>
#endif

94
#ifdef USE_X_TOOLKIT
95
extern void free_frame_menubar ();
96
extern FRAME_PTR x_menubar_window_to_frame ();
97 98 99 100
#if (XtSpecificationRelease >= 5) && !defined(NO_EDITRES)
#define HACK_EDITRES
extern void _XEditResCheckMessages ();
#endif /* not NO_EDITRES */
101 102
#endif /* USE_X_TOOLKIT */

103 104
#ifndef USE_X_TOOLKIT
#define x_any_window_to_frame x_window_to_frame
105
#define x_top_window_to_frame x_window_to_frame
106 107
#endif

108
#ifdef USE_X_TOOLKIT
Karl Heuer's avatar
Karl Heuer committed
109
#include "widget.h"
110 111 112 113 114
#ifndef XtNinitialState
#define XtNinitialState "initialState"
#endif
#endif

115
#ifdef HAVE_SETLOCALE
Karl Heuer's avatar
Karl Heuer committed
116 117 118 119
/* So we can do setlocale.  */
#include <locale.h>
#endif

Karl Heuer's avatar
Karl Heuer committed
120 121 122 123 124 125 126
#ifdef SOLARIS2
/* memmove will be defined as a macro in Xfuncs.h unless
   <string.h> is included beforehand.  The declaration for memmove in
   <string.h> will cause a syntax error when Xfuncs.h later includes it.  */
#include <string.h>
#endif

127
#ifndef min
Jim Blandy's avatar
Jim Blandy committed
128
#define min(a,b) ((a)<(b) ? (a) : (b))
129 130
#endif
#ifndef max
Jim Blandy's avatar
Jim Blandy committed
131
#define max(a,b) ((a)>(b) ? (a) : (b))
132
#endif
133

134 135
/* 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
136

137 138 139 140 141
/* 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;
142

143
/* Frame being updated by update_frame.  This is declared in term.c.
144
   This is set by update_begin and looked at by all the
Jim Blandy's avatar
Jim Blandy committed
145
   XT functions.  It is zero while not inside an update.
Jim Blandy's avatar
Jim Blandy committed
146 147
   In that case, the XT functions assume that `selected_frame'
   is the frame to apply to.  */
148
extern struct frame *updating_frame;
Jim Blandy's avatar
Jim Blandy committed
149

150 151
extern waiting_for_input;

152 153 154
/* This is a frame waiting to be autoraised, within XTread_socket.  */
struct frame *pending_autoraise_frame;

155 156 157
#ifdef USE_X_TOOLKIT
/* The application context for Xt use.  */
XtAppContext Xt_app_con;
158 159 160 161 162

static String Xt_default_resources[] =
{
  0
};
163 164
#endif

Jim Blandy's avatar
Jim Blandy committed
165 166 167 168 169 170 171 172 173 174 175 176 177 178
/* 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;

179 180
/* Mouse movement.

181 182 183 184 185 186 187
   Formerly, we used PointerMotionHintMask (in STANDARD_EVENT_MASK)
   so that we would have to call XQueryPointer after each MotionNotify
   event to ask for another such event.  However, this made mouse tracking
   slow, and there was a bug that made it eventually stop.

   Simply asking for MotionNotify all the time seems to work better.

188 189 190 191 192 193 194 195 196
   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
197
   is off.  */
198 199 200 201 202

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

203 204
static Lisp_Object last_mouse_press_frame;

205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
/* 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;

223 224 225 226 227 228 229
/* 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

230 231
/* Used locally within XTread_socket.  */
static int x_noop_count;
Jim Blandy's avatar
Jim Blandy committed
232

233 234 235
/* Initial values of argv and argc.  */
extern char **initial_argv;
extern int initial_argc;
Jim Blandy's avatar
Jim Blandy committed
236

237
extern Lisp_Object Vcommand_line_args, Vsystem_name;
Jim Blandy's avatar
Jim Blandy committed
238

239 240 241
/* Tells if a window manager is present or not. */

extern Lisp_Object Vx_no_window_manager;
Jim Blandy's avatar
Jim Blandy committed
242

243
extern Lisp_Object Qface, Qmouse_face;
244

Jim Blandy's avatar
Jim Blandy committed
245 246
extern int errno;

247
/* A mask of extra modifier bits to put into every keyboard char.  */
248 249
extern int extra_keyboard_modifiers;

250 251
static Lisp_Object Qvendor_specific_keysyms;

252
extern XrmDatabase x_load_resources ();
Jim Blandy's avatar
Jim Blandy committed
253

254 255
extern Lisp_Object x_icon_type ();

256 257
void x_delete_display ();

258
static void redraw_previous_char ();
259
static void redraw_following_char ();
260
static unsigned int x_x_to_emacs_modifiers ();
Jim Blandy's avatar
Jim Blandy committed
261

262
static int fast_find_position ();
263 264 265
static void note_mouse_highlight ();
static void clear_mouse_face ();
static void show_mouse_face ();
266
static void do_line_dance ();
267

Jim Blandy's avatar
Jim Blandy committed
268 269
static int XTcursor_to ();
static int XTclear_end_of_line ();
270
static int x_io_error_quitter ();
271 272
void x_catch_errors ();
void x_uncatch_errors ();
273

274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
#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 */

302 303 304 305 306 307 308 309 310 311 312
/* 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;
313

314 315
  return 0;
}
Jim Blandy's avatar
Jim Blandy committed
316

317
/* Starting and ending updates.
318 319

   These hooks are called by update_frame at the beginning and end
Jim Blandy's avatar
Jim Blandy committed
320 321 322
   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
323
   should never be called except during an update, the only exceptions
324
   being XTcursor_to, XTwrite_glyphs and XTreassert_line_highlight.  */
Jim Blandy's avatar
Jim Blandy committed
325 326

static
Jim Blandy's avatar
Jim Blandy committed
327 328
XTupdate_begin (f)
     struct frame *f;
329
{
Jim Blandy's avatar
Jim Blandy committed
330 331
  int mask;

Jim Blandy's avatar
Jim Blandy committed
332
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
333 334
    abort ();

Jim Blandy's avatar
Jim Blandy committed
335
  flexlines = f->height;
Jim Blandy's avatar
Jim Blandy committed
336 337 338
  highlight = 0;

  BLOCK_INPUT;
339

340 341 342
  curs_x = FRAME_CURSOR_X (f);
  curs_y = FRAME_CURSOR_Y (f);

343
  if (f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
344
    {
345
      /* Don't do highlighting for mouse motion during the update.  */
346
      FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 1;
347 348 349

      /* If the frame needs to be redrawn,
	 simply forget about any prior mouse highlighting.  */
350
      if (FRAME_GARBAGED_P (f))
351 352
	FRAME_X_DISPLAY_INFO (f)->mouse_face_window = Qnil;

353
      if (!NILP (FRAME_X_DISPLAY_INFO (f)->mouse_face_window))
354 355
	{
	  int firstline, lastline, i;
356
	  struct window *w = XWINDOW (FRAME_X_DISPLAY_INFO (f)->mouse_face_window);
357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372

	  /* 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
373 374 375 376
	     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.  */
377 378
	  if (! (firstline > (XFASTINT (w->top) + window_internal_height (w))
		 || lastline < XFASTINT (w->top)))
379
	    clear_mouse_face (FRAME_X_DISPLAY_INFO (f));
380
	}
381
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
382

Jim Blandy's avatar
Jim Blandy committed
383 384 385 386
  UNBLOCK_INPUT;
}

static
Jim Blandy's avatar
Jim Blandy committed
387 388
XTupdate_end (f)
     struct frame *f;
389
{
Jim Blandy's avatar
Jim Blandy committed
390 391 392 393
  int mask;

  BLOCK_INPUT;

394
  do_line_dance ();
395
  x_display_cursor (f, 1, curs_x, curs_y);
Jim Blandy's avatar
Jim Blandy committed
396

397
  FRAME_X_DISPLAY_INFO (f)->mouse_face_defer = 0;
398 399 400 401 402 403 404
#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.  */
405 406 407
  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);
408 409
#endif

410
  XFlush (FRAME_X_DISPLAY (f));
Jim Blandy's avatar
Jim Blandy committed
411 412
  UNBLOCK_INPUT;
}
413

414
/* This is called after a redisplay on frame F.  */
415 416 417 418 419

static
XTframe_up_to_date (f)
     FRAME_PTR f;
{
420
  BLOCK_INPUT;
421 422
  if (FRAME_X_DISPLAY_INFO (f)->mouse_face_deferred_gc
      || f == FRAME_X_DISPLAY_INFO (f)->mouse_face_mouse_frame)
423
    {
424 425 426 427
      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;
428
    }
429
  UNBLOCK_INPUT;
430
}
Jim Blandy's avatar
Jim Blandy committed
431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450

/* 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);
451
  XTclear_end_of_line (FRAME_WINDOW_WIDTH (updating_frame));
Jim Blandy's avatar
Jim Blandy committed
452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469
}

/* 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
470
/*  XTclear_frame ();  */
Jim Blandy's avatar
Jim Blandy committed
471 472
}

473 474
/* Set the nominal cursor position of the frame.
   This is where display update commands will take effect.
Jim Blandy's avatar
Jim Blandy committed
475 476
   This does not affect the place where the cursor-box is displayed.  */

Jim Blandy's avatar
Jim Blandy committed
477
static int
Jim Blandy's avatar
Jim Blandy committed
478 479 480 481 482 483 484 485 486
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
487
  if (updating_frame == 0)
Jim Blandy's avatar
Jim Blandy committed
488 489
    {
      BLOCK_INPUT;
490
      x_display_cursor (selected_frame, 1, curs_x, curs_y);
491
      XFlush (FRAME_X_DISPLAY (selected_frame));
Jim Blandy's avatar
Jim Blandy committed
492 493 494 495
      UNBLOCK_INPUT;
    }
}

496 497 498 499 500 501 502 503 504 505 506 507 508

/* Return a pointer to per char metric information in FONT of a
   character pointed by B (*XChar2b).  */

#define PER_CHAR_METRIC(font, b)					   \
  ((font)->per_char							   \
   ? ((font)->per_char + (b)->byte2 - (font)->min_char_or_byte2		   \
      + (((font)->min_byte1 || (font)->max_byte1)			   \
	 ? (((b)->byte1 - (font)->min_byte1)				   \
	    * ((font)->max_char_or_byte2 - (font)->min_char_or_byte2 + 1)) \
	 : 0))								   \
   : &((font)->max_bounds))

Jim Blandy's avatar
Jim Blandy committed
509 510
/* Display a sequence of N glyphs found at GP.
   WINDOW is the x-window to output to.  LEFT and TOP are starting coords.
511 512
   HL is 1 if this text is highlighted, 2 if the cursor is on it,
   3 if should appear in its mouse-face.
513 514
   JUST_FOREGROUND if 1 means draw only the foreground;
   don't alter the background.
Jim Blandy's avatar
Jim Blandy committed
515

516 517 518 519 520
   CMPCHARP if non NULL is a pointer to the struct cmpchar_info, which
   means drawing glyphs on the same column.  This is set to non NULL
   only when recursively called within dumpglyphs to draw a composite
   character specified by CMPCHAR.

521
   FONT is the default font to use (for glyphs whose font-code is 0).
Jim Blandy's avatar
Jim Blandy committed
522

523 524 525
   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
526
   glyph is a valid index into FRAME_COMPUTED_FACES (f), and the one
527
   to which we can actually apply intern_face.
528 529 530
   Call this function with input blocked.

   Return overall pixel width of the drawn glyphs.  */
Jim Blandy's avatar
Jim Blandy committed
531

532 533
#if 1
/* This is the multi-face code.  */
Jim Blandy's avatar
Jim Blandy committed
534

535 536
static int
dumpglyphs (f, left, top, gp, n, hl, just_foreground, cmpcharp)
Jim Blandy's avatar
Jim Blandy committed
537
     struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
538 539 540 541
     int left, top;
     register GLYPH *gp; /* Points to first GLYPH. */
     register int n;  /* Number of glyphs to display. */
     int hl;
542
     int just_foreground;
543
     struct cmpchar_info *cmpcharp;
Jim Blandy's avatar
Jim Blandy committed
544
{
545
  /* Holds characters to be displayed. */
546 547
  XChar2b *buf = (XChar2b *) alloca (FRAME_WINDOW_WIDTH (f) * sizeof (*buf));
  register XChar2b *cp;		/* Steps through buf[]. */
Jim Blandy's avatar
Jim Blandy committed
548 549
  register int tlen = GLYPH_TABLE_LENGTH;
  register Lisp_Object *tbase = GLYPH_TABLE_BASE;
550
  Window window = FRAME_X_WINDOW (f);
551
  int orig_left = left;
552 553
  int gidx = 0;
  int pixel_width;
Jim Blandy's avatar
Jim Blandy committed
554

555
  while (n > 0)
Jim Blandy's avatar
Jim Blandy committed
556 557 558
    {
      /* Get the face-code of the next GLYPH.  */
      int cf, len;
559
      GLYPH g = *gp;
560
      int ch, first_ch, charset;
561 562 563
      /* HIGHEST and LOWEST are used while drawing a composite
         character.  The meanings are described later.  */
      int highest, lowest;
Jim Blandy's avatar
Jim Blandy committed
564

565
      GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
566 567
      cf = (cmpcharp ? cmpcharp->face_work : FAST_GLYPH_FACE (g));
      ch = FAST_GLYPH_CHAR (g);
568
      if (gidx == 0) first_ch = ch;
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
      charset = CHAR_CHARSET (ch);
      if (charset == CHARSET_COMPOSITION)
	{
	  /* We must draw components of the composite character on the
             same column.  */
	  cmpcharp = cmpchar_table[COMPOSITE_CHAR_ID (ch)];

	  /* Set the face in the slot for work.  */
	  cmpcharp->face_work = cf;

	  /* We don't need the return value ... */
	  dumpglyphs (f, left, top, cmpcharp->glyph, cmpcharp->glyph_len,
		      hl, just_foreground, cmpcharp);
	  /* ... because the width of just drawn text can be
             calculated as follows.  */
	  left += FONT_WIDTH (f->output_data.x->font) * cmpcharp->width;

	  ++gp, --n;
	  while (gp && (*gp & GLYPH_MASK_PADDING)) ++gp, --n;
	  cmpcharp = NULL;
	  continue;
	}
Jim Blandy's avatar
Jim Blandy committed
591

592 593 594 595 596
      /* Find the run of consecutive glyphs which can be drawn with
	 the same GC (i.e. the same charset and the same face-code).
	 Extract their character codes into BUF.
	 If CMPCHARP is not NULL, face-code is not checked because we
	 use only the face specified in `cmpcharp->face_work'.  */
Jim Blandy's avatar
Jim Blandy committed
597 598 599
      cp = buf;
      while (n > 0)
	{
600 601
	  int this_charset, c1, c2;

Jim Blandy's avatar
Jim Blandy committed
602
	  g = *gp;
603
	  GLYPH_FOLLOW_ALIASES (tbase, tlen, g);
604 605 606 607
	  ch = FAST_GLYPH_CHAR (g);
	  SPLIT_CHAR (ch, this_charset, c1, c2);
	  if (this_charset != charset
	      || (cmpcharp == NULL && FAST_GLYPH_FACE (g) != cf))
Jim Blandy's avatar
Jim Blandy committed
608 609
	    break;

610 611 612 613 614 615 616 617
	  if (c2)
	    cp->byte1 = c1, cp->byte2 = c2;
	  else
	    cp->byte1 = 0, cp->byte2 = c1;
	  ++cp;
	  ++gp, --n;
	  while (gp && (*gp & GLYPH_MASK_PADDING))
	    ++gp, --n;
Jim Blandy's avatar
Jim Blandy committed
618 619 620 621
	}

      /* LEN gets the length of the run.  */
      len = cp - buf;
622 623 624 625
      /* PIXEL_WIDTH get the pixcel width of the run.  */
      pixel_width
	= (FONT_WIDTH (f->output_data.x->font)
	   * (cmpcharp ? cmpcharp->width : len * CHARSET_WIDTH (charset)));
Jim Blandy's avatar
Jim Blandy committed
626 627 628

      /* Now output this run of chars, with the font and pixel values
	 determined by the face code CF.  */
629 630
      {
	struct face *face = FRAME_DEFAULT_FACE (f);
631 632
	XFontStruct *font = NULL;
	GC gc;
633
	int stippled = 0;
634 635 636 637 638
	/* A flag to tell if we have already filled background.  We
	   fill background in advance in the following cases:
	   1) A face has stipple.
	   2) A height of font is different from that of the current line.
	   3) Drawing a composite character.
639
	   4) Font has non-zero _MULE_BASELINE_OFFSET property.
640 641 642 643
	   After filling background, we draw glyphs by XDrawString16.  */
	int background_filled;
	/* Baseline position of a character, offset from TOP.  */
	int baseline;
644 645 646
	/* The property value of `_MULE_RELATIVE_COMPOSE' and
           `_MULE_DEFAULT_ASCENT'.  */
	int relative_compose = 0, default_ascent = 0;
647

648 649
	/* HL = 3 means use a mouse face previously chosen.  */
	if (hl == 3)
650
	  cf = FRAME_X_DISPLAY_INFO (f)->mouse_face_face_id;
651

652 653
	/* First look at the face of the text itself.  */
	if (cf != 0)
654
	  {
655 656
	    /* It's possible for the display table to specify
	       a face code that is out of range.  Use 0 in that case.  */
657 658
	    if (cf < 0 || cf >= FRAME_N_COMPUTED_FACES (f)
		|| FRAME_COMPUTED_FACES (f) [cf] == 0)
659
	      cf = 0;
660 661 662 663

	    if (cf == 1)
	      face = FRAME_MODE_LINE_FACE (f);
	    else
664
	      face = intern_face (f, FRAME_COMPUTED_FACES (f) [cf]);
665 666
	    if (FACE_STIPPLE (face))
	      stippled = 1;
667
	  }
668 669

	/* Then comes the distinction between modeline and normal text.  */
670 671 672 673 674
	else if (hl == 0)
	  ;
	else if (hl == 1)
	  {
	    face = FRAME_MODE_LINE_FACE (f);
675 676
	    if (FACE_STIPPLE (face))
	      stippled = 1;
677 678
	  }

679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700
	/* Setting appropriate font and gc for this charset.  */
	if (charset != CHARSET_ASCII)
	  {
	    int font_id;
	    int fontset = FACE_FONTSET (face);
	    struct font_info *fontp;

	    if ((fontset < 0 && (fontset = FRAME_FONTSET (f)) < 0)
		|| !(fontp = fs_load_font (f, FRAME_X_FONT_TABLE (f),
					   charset, NULL, fontset)))
	      goto font_not_found;

	    font = (XFontStruct *) (fontp->font);
	    gc = FACE_NON_ASCII_GC (face);
	    XSetFont (FRAME_X_DISPLAY (f), gc, font->fid);
	    if (font->max_byte1 != 0)
	      baseline = (f->output_data.x->line_height
			  + font->ascent - font->descent) / 2;
	    else
	      baseline = (f->output_data.x->font_baseline
			  - fontp->baseline_offset);
	    if (cmpcharp && cmpcharp->cmp_rule == NULL)
701 702 703 704
	      {
		relative_compose = fontp->relative_compose;
		default_ascent = fontp->default_ascent;
	      }
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749

	    /* We have to change code points in the following cases.  */
	    if (fontp->font_encoder)
	      {
		/* This font requires CCL program to calculate code
                   point of characters.  */
		struct ccl_program *ccl = fontp->font_encoder;

		if (CHARSET_DIMENSION (charset) == 1)
		  for (cp = buf; cp < buf + len; cp++)
		    {
		      ccl->reg[0] = charset;
		      ccl->reg[1] = cp->byte2;
		      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
		      cp->byte2 = ccl->reg[1];
		    }
		else
		  for (cp = buf; cp < buf + len; cp++)
		    {
		      ccl->reg[0] = charset;
		      ccl->reg[1] = cp->byte1, ccl->reg[2] = cp->byte2;
		      ccl_driver (ccl, NULL, NULL, 0, 0, NULL);
		      cp->byte1 = ccl->reg[1], cp->byte2 = ccl->reg[2];
		    }
	      }
	    else if (fontp->encoding[charset])
	      {
		int enc = fontp->encoding[charset];

		if ((enc == 1 || enc == 2) && CHARSET_DIMENSION (charset) == 2)
		  for (cp = buf; cp < buf + len; cp++)
		    cp->byte1 |= 0x80;
		if (enc == 1 || enc == 3)
		  for (cp = buf; cp < buf + len; cp++)
		    cp->byte2 |= 0x80;
	      }
	  }
	else
	  {
	    font = FACE_FONT (face);
	    baseline = FONT_BASE (font);
	  font_not_found:
	    gc   = FACE_GC   (face);
	  }

750 751 752
#define FACE_DEFAULT (~0)

	/* Now override that if the cursor's on this character.  */
753
	if (hl == 2)
754
	  {
755 756 757
	    /* The cursor overrides stippling.  */
	    stippled = 0;

758 759 760 761
	    if (!cmpcharp
		&& (!font
		    || font == (XFontStruct *) FACE_DEFAULT
		    || font == f->output_data.x->font)
762 763
		&& face->background == f->output_data.x->background_pixel
		&& face->foreground == f->output_data.x->foreground_pixel)
764
	      {
765
		gc = f->output_data.x->cursor_gc;
766 767 768 769 770 771 772
	      }
	    /* Cursor on non-default face: must merge.  */
	    else
	      {
		XGCValues xgcv;
		unsigned long mask;

773
		xgcv.background = f->output_data.x->cursor_pixel;
774
		xgcv.foreground = face->background;
775 776 777
		/* If the glyph would be invisible,
		   try a different foreground.  */
		if (xgcv.foreground == xgcv.background)
778
		  xgcv.foreground = face->foreground;
779
		if (xgcv.foreground == xgcv.background)
780
		  xgcv.foreground = f->output_data.x->cursor_foreground_pixel;
781 782 783 784 785 786 787 788 789
		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;
		  }
790 791 792 793
		if (font)
		  xgcv.font = font->fid;
		else
		  xgcv.font = FACE_FONT (face)->fid;
794 795
		xgcv.graphics_exposures = 0;
		mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
796 797 798 799
		if (FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc)
		  XChangeGC (FRAME_X_DISPLAY (f),
			     FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc,
			     mask, &xgcv);
800
		else
801
		  FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc
802
		    = XCreateGC (FRAME_X_DISPLAY (f), window, mask, &xgcv);
803
		gc = FRAME_X_DISPLAY_INFO (f)->scratch_cursor_gc;
804
#if 0
805 806
/* If this code is restored, it must also reset to the default stipple
   if necessary. */
807
		if (face->stipple && face->stipple != FACE_DEFAULT)
808
		  XSetStipple (FRAME_X_DISPLAY (f), gc, face->stipple);
809
#endif
810
	      }
811 812
	  }

813
	if (font == (XFontStruct *) FACE_DEFAULT)
814
	  font = f->output_data.x->font;
815

816 817 818 819 820
	if (font && (just_foreground || (cmpcharp && gidx > 0)))
	  background_filled = 1;
	else if (!font
		 || stippled
		 || f->output_data.x->line_height != FONT_HEIGHT (font)
821 822
		 || cmpcharp
		 || baseline != f->output_data.x->font_baseline)
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
	  {
	    if (!stippled)
	      /* This is to fill a rectangle with background color.  */
	      XSetStipple (FRAME_X_DISPLAY (f), gc,
			   FRAME_X_DISPLAY_INFO (f)->null_pixel);
	    /* Turn stipple on.  */
	    XSetFillStyle (FRAME_X_DISPLAY (f), gc, FillOpaqueStippled);

	    /* Draw stipple or background color on background.  */
	    XFillRectangle (FRAME_X_DISPLAY (f), window, gc,
			    left, top, pixel_width,
			    f->output_data.x->line_height);

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

	    background_filled = 1;
	    if (cmpcharp)
	      /* To assure not to fill background while drawing
		 remaining components.  */
	      just_foreground = 1;
	  }
845
	else
846 847 848
	  background_filled = 0;

	if (font)
849
	  {
850
	    if (cmpcharp)
851
	      {
852 853
		XCharStruct *pcm; /* Pointer to per char metric info.  */
		int i;
854

855 856 857 858 859 860 861 862
		if ((cmpcharp->cmp_rule || relative_compose)
		    && gidx == 0)
		  {
		    /* This is the first character.  Initialize variables.
		       HIGHEST is the highest position of glyphs ever
		       written, LOWEST the lowest position.  */
		    int x_offset = 0;

863 864 865 866 867 868 869 870 871 872 873 874 875
		    if (default_ascent
			&& CHAR_TABLE_P (Vuse_default_ascent)
			&& !NILP (Faref (Vuse_default_ascent, first_ch)))
		      {
			highest = default_ascent;
			lowest = 0;
		      }
		    else
		      {
			pcm = PER_CHAR_METRIC (font, buf);
			highest = pcm->ascent + 1;
			lowest = - pcm->descent;
		      }
876 877 878 879 880 881 882 883 884 885 886 887

		    if (cmpcharp->cmp_rule)
		      x_offset = (cmpcharp->col_offset[0]
				  * FONT_WIDTH (f->output_data.x->font));
		    /* Draw the first character at the normal position.  */
		    XDrawString16 (FRAME_X_DISPLAY (f), window, gc,
				   left + x_offset, top + baseline, buf, 1);
		    i = 1;
		    gidx++;
		  }
		else
		  i = 0;
888

889 890 891
		for (; i < len; i++, gidx++)
		  {
		    int x_offset = 0, y_offset = 0;
892

893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
		    if (relative_compose)
		      {
			pcm = PER_CHAR_METRIC (font, buf + i);
			if (- pcm->descent >= relative_compose)
			  {
			    /* Draw above the current glyphs.  */
			    y_offset = highest + pcm->descent;
			    highest += pcm->ascent + pcm->descent;
			  }
			else if (pcm->ascent <= 0)
			  {
			    /* Draw beneath the current glyphs.  */
			    y_offset = lowest - pcm->ascent;
			    lowest -= pcm->ascent + pcm->descent;
			  }
		      }
		    else if (cmpcharp->cmp_rule)
		      {
			int gref = (cmpcharp->cmp_rule[gidx] - 0xA0) / 9;
			int nref = (cmpcharp->cmp_rule[gidx] - 0xA0) % 9;
			int bottom, top;

			/* Re-encode GREF and NREF so that they specify
			   only Y-axis information:
			   0:top, 1:base, 2:bottom, 3:center  */
			gref = gref / 3 + (gref == 4) * 2;
			nref = nref / 3 + (nref == 4) * 2;

			pcm = PER_CHAR_METRIC (font, buf + i);
			bottom = ((gref == 0 ? highest : gref == 1 ? 0
				   : gref == 2 ? lowest
				   : (highest + lowest) / 2)
				  - (nref == 0 ? pcm->ascent + pcm->descent
				     : nref == 1 ? pcm->descent : nref == 2 ? 0
				     : (pcm->ascent + pcm->descent) / 2));
			top = bottom + (pcm->ascent + pcm->descent);
			if (top > highest)
			  highest = top;
			if (bottom < lowest)
			  lowest = bottom;
			y_offset = bottom + pcm->descent;
			x_offset = (cmpcharp->col_offset[gidx]
				    * FONT_WIDTH (f->output_data.x->font));
		      }
		    XDrawString16 (FRAME_X_DISPLAY (f), window, gc,
				   left + x_offset, top + baseline - y_offset,
				   buf + i, 1);
		  }
941
	      }
942 943 944
	    else if (background_filled)
	      XDrawString16 (FRAME_X_DISPLAY (f), window, gc,
			     left, top + baseline, buf, len);
945
	    else
946 947
	      XDrawImageString16 (FRAME_X_DISPLAY (f), window, gc,
				  left, top + baseline, buf, len);
948

949
	    /* Clear the rest of the line's height.  */
950
	    if (f->output_data.x->line_height > FONT_HEIGHT (font))
951
	      XClearArea (FRAME_X_DISPLAY (f), window, left,
952 953 954 955
			  top + FONT_HEIGHT (font),
			  FONT_WIDTH (font) * len,
			  /* This is how many pixels of height
			     we have to clear.  */
956
			  f->output_data.x->line_height - FONT_HEIGHT (font),
957 958 959 960
			  False);

#if 0 /* Doesn't work, because it uses FRAME_CURRENT_GLYPHS,
	 which often is not up to date yet.  */
961 962 963 964 965 966 967 968 969 970 971 972
	    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
	  }
	else
973
	  {
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
	    /* There's no appropriate font for this glyph.  Just show
               rectangles.  */

	    if (cmpcharp)
	      XDrawRectangle
		(FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
		 left, top + 1,
		 pixel_width - 2, f->output_data.x->line_height - 3);
	    else
	      {
		int left_offset;
		int left_skip_step = (FONT_WIDTH (f->output_data.x->font)
				      * CHARSET_WIDTH (charset));

		for (left_offset = 0; left_offset < pixel_width;
		     left_offset += left_skip_step)
		  XDrawRectangle
		    (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), gc,
		     left + left_offset, top + 1,
		     left_skip_step - 2, f->output_data.x->line_height - 3);
	      }
995
	  }
996
	
997 998 999
	/* 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
1000
	{
1001 1002 1003 1004 1005
	  /* Setting underline position based on the metric of the
	     current font results in shaky underline if it strides
	     over different fonts.  So, we set the position based only
	     on the default font of this frame.  */
	  int underline_position = f->output_data.x->font_baseline + 1;
1006

1007 1008
	  if (underline_position >= f->output_data.x->line_height)
	    underline_position = f->output_data.x->line_height - 1;
1009 1010

	  if (face->underline)
1011
	    XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
1012
			    FACE_GC (face),
1013
			    left, top + underline_position, pixel_width, 1);
Jim Blandy's avatar
Jim Blandy committed
1014
	}
1015

1016 1017
	if (!cmpcharp)
	  left += pixel_width;
1018
      }
Jim Blandy's avatar
Jim Blandy committed
1019
    }
1020 1021

  return (left - orig_left);
Jim Blandy's avatar
Jim Blandy committed
1022
}
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
#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;
1035
     XFontStruct *font;
1036 1037 1038
{
  register int len;
  Window window = FRAME_X_WINDOW (f);
1039 1040 1041
  GC drawing_gc =   (hl == 2 ? f->output_data.x->cursor_gc
		             : (hl ? f->output_data.x->reverse_gc
				   : f->output_data.x->normal_gc));
1042 1043

  if (sizeof (GLYPH) == sizeof (XChar2b))
1044
    XDrawImageString16 (FRAME_X_DISPLAY (f), window, drawing_gc,
1045 1046
			left, top + FONT_BASE (font), (XChar2b *) gp, n);
  else if (sizeof (GLYPH) == sizeof (unsigned char))
1047
    XDrawImageString (FRAME_X_DISPLAY (f), window, drawing_gc,
1048 1049 1050 1051 1052 1053 1054
		      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
1055

1056 1057
/* Output some text at the nominal frame cursor position.
   Advance the cursor over the text.
Jim Blandy's avatar
Jim Blandy committed
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
   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
1070
  struct frame *f;
Jim Blandy's avatar
Jim Blandy committed
1071 1072 1073

  BLOCK_INPUT;

1074
  do_line_dance ();
Jim Blandy's avatar
Jim Blandy committed
1075 1076
  f = updating_frame;
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
1077
    {
Jim Blandy's avatar
Jim Blandy committed
1078
      f = selected_frame;
Jim Blandy's avatar
Jim Blandy committed
1079
      /* If not within an update,
Jim Blandy's avatar
Jim Blandy committed
1080 1081 1082
	 output at the frame's visible cursor.  */
      curs_x = f->cursor_x;
      curs_y = f->cursor_y;
Jim Blandy's avatar
Jim Blandy committed
1083 1084
    }

Jim Blandy's avatar
Jim Blandy committed
1085
  dumpglyphs (f,
1086 1087
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
1088
	      start, len, highlight, 0, NULL);
Jim Blandy's avatar
Jim Blandy committed
1089 1090

  /* If we drew on top of the cursor, note that it is turned off.  */
Jim Blandy's avatar
Jim Blandy committed
1091 1092 1093
  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && curs_x + len > f->phys_cursor_x)
1094
    f->phys_cursor_on = 0;
1095

Jim Blandy's avatar
Jim Blandy committed
1096
  if (updating_frame == 0)
1097
    x_display_cursor (f, 1, FRAME_CURSOR_X (f) + len, FRAME_CURSOR_Y (f));
Jim Blandy's avatar
Jim Blandy committed
1098 1099 1100 1101 1102 1103
  else
    curs_x += len;

  UNBLOCK_INPUT;
}

1104 1105
/* 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
1106 1107
   to column FIRST_UNUSED (exclusive).  The idea is that everything
   from FIRST_UNUSED onward is already erased.  */
1108

1109
static
Jim Blandy's avatar
Jim Blandy committed
1110 1111 1112
XTclear_end_of_line (first_unused)
     register int first_unused;
{
Jim Blandy's avatar
Jim Blandy committed
1113
  struct frame *f = updating_frame;
Jim Blandy's avatar
Jim Blandy committed
1114 1115
  int mask;

Jim Blandy's avatar
Jim Blandy committed
1116
  if (f == 0)
Jim Blandy's avatar
Jim Blandy committed
1117 1118
    abort ();

Jim Blandy's avatar
Jim Blandy committed
1119
  if (curs_y < 0 || curs_y >= f->height)
Jim Blandy's avatar
Jim Blandy committed
1120 1121 1122 1123
    return;
  if (first_unused <= 0)
    return;

1124 1125
  if (first_unused >= FRAME_WINDOW_WIDTH (f))
    first_unused = FRAME_WINDOW_WIDTH (f);
Jim Blandy's avatar
Jim Blandy committed
1126

1127 1128
  first_unused += FRAME_LEFT_SCROLL_BAR_WIDTH (f);

Jim Blandy's avatar
Jim Blandy committed
1129 1130
  BLOCK_INPUT;

1131 1132
  do_line_dance ();

Jim Blandy's avatar
Jim Blandy committed
1133
  /* Notice if the cursor will be cleared by this operation.  */
Jim Blandy's avatar
Jim Blandy committed
1134 1135 1136
  if (curs_y == f->phys_cursor_y
      && curs_x <= f->phys_cursor_x
      && f->phys_cursor_x < first_unused)
1137
    f->phys_cursor_on = 0;
Jim Blandy's avatar
Jim Blandy committed
1138

1139
  XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
1140 1141
	      CHAR_TO_PIXEL_COL (f, curs_x),
	      CHAR_TO_PIXEL_ROW (f, curs_y),
1142 1143
	      FONT_WIDTH (f->output_data.x->font) * (first_unused - curs_x),
	      f->output_data.x->line_height, False);
1144
#if 0
1145
  redraw_previous_char (f, curs_x, curs_y, highlight);
1146
#endif
Jim Blandy's avatar
Jim Blandy committed
1147 1148 1149 1150

  UNBLOCK_INPUT;
}

1151 1152 1153 1154 1155 1156 1157 1158 1159
static
XTclear_frame ()
{
  int mask;
  struct frame *f = updating_frame;

  if (f == 0)
    f = selected_frame;

1160
  f->phys_cursor_on = 0;	/* Cursor not visible.  */
1161 1162
  curs_x = 0;			/* Nominal cursor position is top left.  */
  curs_y = 0;
1163

1164 1165
  BLOCK_INPUT;

1166
  XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
1167 1168 1169 1170 1171

  /* 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);

1172
  XFlush (FRAME_X_DISPLAY (f));
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
  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.  */

1185 1186 1187
/* 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,
1188 1189
   in case the character after X overlaps into the one before X.
   Call this function with input blocked.  */
1190 1191

static void
1192
redraw_previous_char (f, x, y, highlight_flag)
1193 1194
     FRAME_PTR f;
     int x, y;
1195
     int highlight_flag;
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
{
  /* 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;
1206
      XClearArea (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
1207 1208
		  CHAR_TO_PIXEL_COL (f, x - 1),
		  CHAR_TO_PIXEL_ROW (f, y),
1209