Convert DEFUNs to standard C.
[bpt/emacs.git] / src / dispnew.c
CommitLineData
4588ec20 1/* Updating of data structures for redisplay.
0b5538bd
TTN
2 Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995,
3 1997, 1998, 1999, 2000, 2001, 2002, 2003,
114f9c96 4 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
4588ec20
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5
6This file is part of GNU Emacs.
7
9ec0b715 8GNU Emacs is free software: you can redistribute it and/or modify
4588ec20 9it under the terms of the GNU General Public License as published by
9ec0b715
GM
10the Free Software Foundation, either version 3 of the License, or
11(at your option) any later version.
4588ec20
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12
13GNU Emacs is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
9ec0b715 19along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
4588ec20 20
18160b98 21#include <config.h>
68c45bf0 22#include <signal.h>
565620a5 23#include <stdio.h>
4588ec20 24#include <ctype.h>
d7306fe6 25#include <setjmp.h>
4588ec20 26
dfcf069d
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27#ifdef HAVE_UNISTD_H
28#include <unistd.h>
29#endif
30
47099d6f 31#include "lisp.h"
4588ec20
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32#include "termchar.h"
33#include "termopts.h"
a0879520 34/* cm.h must come after dispextern.h on Windows. */
fd2e066a
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35#include "dispextern.h"
36#include "cm.h"
4588ec20 37#include "buffer.h"
83be827a 38#include "character.h"
d43721a2 39#include "keyboard.h"
502b9b64 40#include "frame.h"
428a555e 41#include "termhooks.h"
4588ec20
JB
42#include "window.h"
43#include "commands.h"
44#include "disptab.h"
45#include "indent.h"
d169fe39 46#include "intervals.h"
97cf50e7 47#include "blockinput.h"
dfcf069d 48#include "process.h"
4588ec20 49
58b2bb63 50#include "syssignal.h"
a41f8bed 51
4588ec20
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52#ifdef HAVE_X_WINDOWS
53#include "xterm.h"
5f5c8ee5 54#endif /* HAVE_X_WINDOWS */
4588ec20 55
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56#ifdef HAVE_NTGUI
57#include "w32term.h"
58#endif /* HAVE_NTGUI */
59
edfda783
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60#ifdef HAVE_NS
61#include "nsterm.h"
62#endif
63
5f5c8ee5 64/* Include systime.h after xterm.h to avoid double inclusion of time.h. */
6cbd1643 65
5f5c8ee5 66#include "systime.h"
3883a901
RS
67#include <errno.h>
68
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69/* To get the prototype for `sleep'. */
70
71#ifdef HAVE_UNISTD_H
72#include <unistd.h>
73#endif
74
4588ec20 75/* Get number of chars of output now in the buffer of a stdio stream.
5f5c8ee5
GM
76 This ought to be built in in stdio, but it isn't. Some s- files
77 override this because their stdio internals differ. */
78
e3271ae5 79#ifdef __GNU_LIBRARY__
5f5c8ee5
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80
81/* The s- file might have overridden the definition with one that
82 works for the system's C library. But we are using the GNU C
83 library, so this is the right definition for every system. */
84
3883a901
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85#ifdef GNU_LIBRARY_PENDING_OUTPUT_COUNT
86#define PENDING_OUTPUT_COUNT GNU_LIBRARY_PENDING_OUTPUT_COUNT
87#else
cb5558ff 88#undef PENDING_OUTPUT_COUNT
e3271ae5 89#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->__bufp - (FILE)->__buffer)
3883a901
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90#endif
91#else /* not __GNU_LIBRARY__ */
68c45bf0
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92#if !defined (PENDING_OUTPUT_COUNT) && HAVE_STDIO_EXT_H && HAVE___FPENDING
93#include <stdio_ext.h>
94#define PENDING_OUTPUT_COUNT(FILE) __fpending (FILE)
95#endif
cb5558ff 96#ifndef PENDING_OUTPUT_COUNT
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97#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base)
98#endif
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99#endif /* not __GNU_LIBRARY__ */
100
8a2a6032 101#if defined(HAVE_TERM_H) && defined (GNU_LINUX) && defined (HAVE_LIBNCURSES)
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102#include <term.h> /* for tgetent */
103#endif
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104\f
105/* Structure to pass dimensions around. Used for character bounding
106 boxes, glyph matrix dimensions and alike. */
107
108struct dim
109{
110 int width;
111 int height;
112};
113
114\f
115/* Function prototypes. */
116
f57e2426
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117static struct glyph_matrix *save_current_matrix (struct frame *);
118static void restore_current_matrix (struct frame *, struct glyph_matrix *);
119static int showing_window_margins_p (struct window *);
120static void fake_current_matrices (Lisp_Object);
121static void redraw_overlapping_rows (struct window *, int);
122static void redraw_overlapped_rows (struct window *, int);
123static int count_blanks (struct glyph *, int);
124static int count_match (struct glyph *, struct glyph *,
125 struct glyph *, struct glyph *);
126static unsigned line_draw_cost (struct glyph_matrix *, int);
127static void update_frame_line (struct frame *, int);
5f5c8ee5 128static struct dim allocate_matrices_for_frame_redisplay
f57e2426
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129 (Lisp_Object, int, int, int, int *);
130static void allocate_matrices_for_window_redisplay (struct window *);
131static int realloc_glyph_pool (struct glyph_pool *, struct dim);
132static void adjust_frame_glyphs (struct frame *);
133struct glyph_matrix *new_glyph_matrix (struct glyph_pool *);
134static void free_glyph_matrix (struct glyph_matrix *);
135static void adjust_glyph_matrix (struct window *, struct glyph_matrix *,
136 int, int, struct dim);
137static void change_frame_size_1 (struct frame *, int, int, int, int, int);
138static void swap_glyph_pointers (struct glyph_row *, struct glyph_row *);
f1d2ce7f 139#if GLYPH_DEBUG
f57e2426 140static int glyph_row_slice_p (struct glyph_row *, struct glyph_row *);
9339e87f 141#endif
f57e2426
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142static void fill_up_frame_row_with_spaces (struct glyph_row *, int);
143static void build_frame_matrix_from_window_tree (struct glyph_matrix *,
144 struct window *);
145static void build_frame_matrix_from_leaf_window (struct glyph_matrix *,
146 struct window *);
147static struct glyph_pool *new_glyph_pool (void);
148static void free_glyph_pool (struct glyph_pool *);
149static void adjust_frame_glyphs_initially (void);
150static void adjust_frame_message_buffer (struct frame *);
151static void adjust_decode_mode_spec_buffer (struct frame *);
152static void fill_up_glyph_row_with_spaces (struct glyph_row *);
153static void build_frame_matrix (struct frame *);
154void clear_current_matrices (struct frame *);
155void scroll_glyph_matrix_range (struct glyph_matrix *, int, int,
156 int, int);
157static void clear_window_matrices (struct window *, int);
158static void fill_up_glyph_row_area_with_spaces (struct glyph_row *, int);
159static int scrolling_window (struct window *, int);
160static int update_window_line (struct window *, int, int *);
161static void update_marginal_area (struct window *, int, int);
162static int update_text_area (struct window *, int);
163static void make_current (struct glyph_matrix *, struct glyph_matrix *,
164 int);
165static void mirror_make_current (struct window *, int);
166void check_window_matrix_pointers (struct window *);
b96fd3e8 167#if GLYPH_DEBUG
f57e2426
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168static void check_matrix_pointers (struct glyph_matrix *,
169 struct glyph_matrix *);
b96fd3e8 170#endif
f57e2426
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171static void mirror_line_dance (struct window *, int, int, int *, char *);
172static int update_window_tree (struct window *, int);
173static int update_window (struct window *, int);
174static int update_frame_1 (struct frame *, int, int);
175static void set_window_cursor_after_update (struct window *);
176static int row_equal_p (struct window *, struct glyph_row *,
177 struct glyph_row *, int);
178static void adjust_frame_glyphs_for_window_redisplay (struct frame *);
179static void adjust_frame_glyphs_for_frame_redisplay (struct frame *);
180static void reverse_rows (struct glyph_matrix *, int, int);
181static int margin_glyphs_to_reserve (struct window *, int, Lisp_Object);
182static void sync_window_with_frame_matrix_rows (struct window *);
183struct window *frame_row_to_window (struct window *, int);
5f5c8ee5 184
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GM
185\f
186/* Non-zero means don't pause redisplay for pending input. (This is
187 for debugging and for a future implementation of EDT-like
188 scrolling. */
4588ec20 189
5f5c8ee5 190int redisplay_dont_pause;
45140e01 191
d012c62b
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192/* Define PERIODIC_PREEMPTION_CHECKING to 1, if micro-second timers
193 are supported, so we can check for input during redisplay at
194 regular intervals. */
195#ifdef EMACS_HAS_USECS
196#define PERIODIC_PREEMPTION_CHECKING 1
197#else
198#define PERIODIC_PREEMPTION_CHECKING 0
199#endif
200
201#if PERIODIC_PREEMPTION_CHECKING
202
203/* If a number (float), check for user input every N seconds. */
204
205Lisp_Object Vredisplay_preemption_period;
206
207/* Redisplay preemption timers. */
208
209static EMACS_TIME preemption_period;
210static EMACS_TIME preemption_next_check;
211
212#endif
213
a41f8bed 214/* Nonzero upon entry to redisplay means do not assume anything about
502b9b64 215 current contents of actual terminal frame; clear and redraw it. */
4588ec20 216
502b9b64 217int frame_garbaged;
4588ec20 218
5f5c8ee5 219/* Nonzero means last display completed. Zero means it was preempted. */
4588ec20
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220
221int display_completed;
222
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223/* Lisp variable visible-bell; enables use of screen-flash instead of
224 audible bell. */
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225
226int visible_bell;
227
502b9b64 228/* Invert the color of the whole frame, at a low level. */
4588ec20
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229
230int inverse_video;
231
232/* Line speed of the terminal. */
233
31ade731 234EMACS_INT baud_rate;
4588ec20 235
5f5c8ee5 236/* Either nil or a symbol naming the window system under which Emacs
2246281f 237 creates the first frame. */
4588ec20 238
2246281f 239Lisp_Object Vinitial_window_system;
4588ec20
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240
241/* Version number of X windows: 10, 11 or nil. */
5f5c8ee5 242
4588ec20
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243Lisp_Object Vwindow_system_version;
244
5f5c8ee5
GM
245/* Vector of glyph definitions. Indexed by glyph number, the contents
246 are a string which is how to output the glyph.
4588ec20
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247
248 If Vglyph_table is nil, a glyph is output by using its low 8 bits
5f5c8ee5
GM
249 as a character code.
250
251 This is an obsolete feature that is no longer used. The variable
252 is retained for compatibility. */
4588ec20
JB
253
254Lisp_Object Vglyph_table;
255
256/* Display table to use for vectors that don't specify their own. */
257
258Lisp_Object Vstandard_display_table;
259
5f5c8ee5 260/* Nonzero means reading single-character input with prompt so put
153a073c 261 cursor on mini-buffer after the prompt. Positive means at end of
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GM
262 text in echo area; negative means at beginning of line. */
263
4588ec20 264int cursor_in_echo_area;
9cda4f7c 265
e7067d00 266Lisp_Object Qdisplay_table, Qredisplay_dont_pause;
5f5c8ee5 267
4588ec20 268\f
5f5c8ee5 269/* The currently selected frame. In a single-frame version, this
91fb7e1b 270 variable always equals the_only_frame. */
4588ec20 271
91fb7e1b 272Lisp_Object selected_frame;
4588ec20 273
5f5c8ee5 274/* A frame which is not just a mini-buffer, or 0 if there are no such
502b9b64 275 frames. This is usually the most recent such frame that was
87485d6f
MW
276 selected. In a single-frame version, this variable always holds
277 the address of the_only_frame. */
4588ec20 278
5f5c8ee5 279struct frame *last_nonminibuf_frame;
d52bad65 280
5f5c8ee5 281/* 1 means SIGWINCH happened when not safe. */
4588ec20 282
5f5c8ee5 283int delayed_size_change;
4588ec20 284
5f5c8ee5 285/* 1 means glyph initialization has been completed at startup. */
4588ec20 286
5f5c8ee5 287static int glyphs_initialized_initially_p;
4588ec20 288
5f5c8ee5 289/* Updated window if != 0. Set by update_window. */
4588ec20 290
5f5c8ee5 291struct window *updated_window;
4588ec20 292
5f5c8ee5 293/* Glyph row updated in update_window_line, and area that is updated. */
4588ec20 294
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GM
295struct glyph_row *updated_row;
296int updated_area;
4588ec20 297
5f5c8ee5 298/* A glyph for a space. */
4588ec20 299
5f5c8ee5 300struct glyph space_glyph;
4588ec20 301
5f5c8ee5
GM
302/* Counts of allocated structures. These counts serve to diagnose
303 memory leaks and double frees. */
4588ec20 304
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305int glyph_matrix_count;
306int glyph_pool_count;
4588ec20 307
5f5c8ee5
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308/* If non-null, the frame whose frame matrices are manipulated. If
309 null, window matrices are worked on. */
4588ec20 310
5f5c8ee5 311static struct frame *frame_matrix_frame;
4588ec20 312
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GM
313/* Non-zero means that fonts have been loaded since the last glyph
314 matrix adjustments. Redisplay must stop, and glyph matrices must
315 be adjusted when this flag becomes non-zero during display. The
316 reason fonts can be loaded so late is that fonts of fontsets are
3aa9f0c4
KH
317 loaded on demand. Another reason is that a line contains many
318 characters displayed by zero width or very narrow glyphs of
319 variable-width fonts. */
836d2cde 320
5f5c8ee5 321int fonts_changed_p;
836d2cde 322
177c0ea7 323/* Convert vpos and hpos from frame to window and vice versa.
5f5c8ee5 324 This may only be used for terminal frames. */
836d2cde 325
5f5c8ee5 326#if GLYPH_DEBUG
4588ec20 327
f57e2426
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328static int window_to_frame_vpos (struct window *, int);
329static int window_to_frame_hpos (struct window *, int);
5f5c8ee5
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330#define WINDOW_TO_FRAME_VPOS(W, VPOS) window_to_frame_vpos ((W), (VPOS))
331#define WINDOW_TO_FRAME_HPOS(W, HPOS) window_to_frame_hpos ((W), (HPOS))
4588ec20 332
9b0e97aa
GM
333/* One element of the ring buffer containing redisplay history
334 information. */
335
336struct redisplay_history
337{
338 char trace[512 + 100];
339};
340
341/* The size of the history buffer. */
342
343#define REDISPLAY_HISTORY_SIZE 30
344
345/* The redisplay history buffer. */
346
347static struct redisplay_history redisplay_history[REDISPLAY_HISTORY_SIZE];
348
349/* Next free entry in redisplay_history. */
350
351static int history_idx;
352
353/* A tick that's incremented each time something is added to the
354 history. */
355
356static unsigned history_tick;
357
f57e2426
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358static void add_frame_display_history (struct frame *, int);
359static void add_window_display_history (struct window *, char *, int);
6a8aec41 360\f
9b0e97aa
GM
361/* Add to the redisplay history how window W has been displayed.
362 MSG is a trace containing the information how W's glyph matrix
153a073c 363 has been constructed. PAUSED_P non-zero means that the update
9b0e97aa
GM
364 has been interrupted for pending input. */
365
366static void
367add_window_display_history (w, msg, paused_p)
368 struct window *w;
369 char *msg;
370 int paused_p;
371{
372 char *buf;
177c0ea7 373
9b0e97aa
GM
374 if (history_idx >= REDISPLAY_HISTORY_SIZE)
375 history_idx = 0;
376 buf = redisplay_history[history_idx].trace;
377 ++history_idx;
177c0ea7 378
9b0e97aa
GM
379 sprintf (buf, "%d: window %p (`%s')%s\n",
380 history_tick++,
381 w,
382 ((BUFFERP (w->buffer)
383 && STRINGP (XBUFFER (w->buffer)->name))
d5db4077 384 ? (char *) SDATA (XBUFFER (w->buffer)->name)
9b0e97aa
GM
385 : "???"),
386 paused_p ? " ***paused***" : "");
387 strcat (buf, msg);
388}
389
390
391/* Add to the redisplay history that frame F has been displayed.
392 PAUSED_P non-zero means that the update has been interrupted for
393 pending input. */
394
395static void
396add_frame_display_history (f, paused_p)
397 struct frame *f;
398 int paused_p;
399{
400 char *buf;
177c0ea7 401
9b0e97aa
GM
402 if (history_idx >= REDISPLAY_HISTORY_SIZE)
403 history_idx = 0;
404 buf = redisplay_history[history_idx].trace;
405 ++history_idx;
177c0ea7 406
9b0e97aa
GM
407 sprintf (buf, "%d: update frame %p%s",
408 history_tick++,
409 f, paused_p ? " ***paused***" : "");
410}
411
412
413DEFUN ("dump-redisplay-history", Fdump_redisplay_history,
414 Sdump_redisplay_history, 0, 0, "",
7ee72033 415 doc: /* Dump redisplay history to stderr. */)
5842a27b 416 (void)
9b0e97aa
GM
417{
418 int i;
419
420 for (i = history_idx - 1; i != history_idx; --i)
421 {
422 if (i < 0)
423 i = REDISPLAY_HISTORY_SIZE - 1;
424 fprintf (stderr, "%s\n", redisplay_history[i].trace);
425 }
426
427 return Qnil;
428}
429
430
5f5c8ee5 431#else /* GLYPH_DEBUG == 0 */
4588ec20 432
7df02016
KS
433#define WINDOW_TO_FRAME_VPOS(W, VPOS) ((VPOS) + WINDOW_TOP_EDGE_LINE (W))
434#define WINDOW_TO_FRAME_HPOS(W, HPOS) ((HPOS) + WINDOW_LEFT_EDGE_COL (W))
4588ec20 435
5f5c8ee5 436#endif /* GLYPH_DEBUG == 0 */
4588ec20 437
4588ec20 438
72af86bd
AS
439#ifdef PROFILING
440/* FIXME: only used to find text start for profiling. */
4588ec20
JB
441
442void
971de7fb 443safe_bcopy (const char *from, char *to, int size)
4588ec20 444{
72af86bd 445 abort ();
177c0ea7 446}
72af86bd 447#endif
5f5c8ee5
GM
448\f
449/***********************************************************************
450 Glyph Matrices
451 ***********************************************************************/
452
453/* Allocate and return a glyph_matrix structure. POOL is the glyph
454 pool from which memory for the matrix should be allocated, or null
455 for window-based redisplay where no glyph pools are used. The
456 member `pool' of the glyph matrix structure returned is set to
457 POOL, the structure is otherwise zeroed. */
458
459struct glyph_matrix *
971de7fb 460new_glyph_matrix (struct glyph_pool *pool)
4588ec20 461{
5f5c8ee5
GM
462 struct glyph_matrix *result;
463
464 /* Allocate and clear. */
465 result = (struct glyph_matrix *) xmalloc (sizeof *result);
72af86bd 466 memset (result, 0, sizeof *result);
4588ec20 467
5f5c8ee5
GM
468 /* Increment number of allocated matrices. This count is used
469 to detect memory leaks. */
470 ++glyph_matrix_count;
4588ec20 471
5f5c8ee5
GM
472 /* Set pool and return. */
473 result->pool = pool;
474 return result;
4588ec20
JB
475}
476
4588ec20 477
5f5c8ee5
GM
478/* Free glyph matrix MATRIX. Passing in a null MATRIX is allowed.
479
480 The global counter glyph_matrix_count is decremented when a matrix
481 is freed. If the count gets negative, more structures were freed
482 than allocated, i.e. one matrix was freed more than once or a bogus
483 pointer was passed to this function.
177c0ea7 484
5f5c8ee5
GM
485 If MATRIX->pool is null, this means that the matrix manages its own
486 glyph memory---this is done for matrices on X frames. Freeing the
487 matrix also frees the glyph memory in this case. */
488
489static void
971de7fb 490free_glyph_matrix (struct glyph_matrix *matrix)
4588ec20 491{
5f5c8ee5
GM
492 if (matrix)
493 {
494 int i;
495
496 /* Detect the case that more matrices are freed than were
497 allocated. */
498 if (--glyph_matrix_count < 0)
499 abort ();
500
501 /* Free glyph memory if MATRIX owns it. */
502 if (matrix->pool == NULL)
503 for (i = 0; i < matrix->rows_allocated; ++i)
504 xfree (matrix->rows[i].glyphs[LEFT_MARGIN_AREA]);
177c0ea7 505
5f5c8ee5
GM
506 /* Free row structures and the matrix itself. */
507 xfree (matrix->rows);
508 xfree (matrix);
509 }
510}
4588ec20 511
4588ec20 512
5f5c8ee5
GM
513/* Return the number of glyphs to reserve for a marginal area of
514 window W. TOTAL_GLYPHS is the number of glyphs in a complete
515 display line of window W. MARGIN gives the width of the marginal
516 area in canonical character units. MARGIN should be an integer
517 or a float. */
518
519static int
971de7fb 520margin_glyphs_to_reserve (struct window *w, int total_glyphs, Lisp_Object margin)
5f5c8ee5
GM
521{
522 int n;
4588ec20 523
5f5c8ee5 524 if (NUMBERP (margin))
4588ec20 525 {
7df02016 526 int width = XFASTINT (w->total_cols);
5f5c8ee5
GM
527 double d = max (0, XFLOATINT (margin));
528 d = min (width / 2 - 1, d);
35ec832e 529 n = (int) ((double) total_glyphs / width * d);
5f5c8ee5
GM
530 }
531 else
532 n = 0;
533
534 return n;
535}
536
4588ec20 537
5f5c8ee5
GM
538/* Adjust glyph matrix MATRIX on window W or on a frame to changed
539 window sizes.
4588ec20 540
5f5c8ee5
GM
541 W is null if the function is called for a frame glyph matrix.
542 Otherwise it is the window MATRIX is a member of. X and Y are the
543 indices of the first column and row of MATRIX within the frame
544 matrix, if such a matrix exists. They are zero for purely
545 window-based redisplay. DIM is the needed size of the matrix.
d52bad65 546
5f5c8ee5
GM
547 In window-based redisplay, where no frame matrices exist, glyph
548 matrices manage their own glyph storage. Otherwise, they allocate
549 storage from a common frame glyph pool which can be found in
550 MATRIX->pool.
23b0200c 551
5f5c8ee5
GM
552 The reason for this memory management strategy is to avoid complete
553 frame redraws if possible. When we allocate from a common pool, a
554 change of the location or size of a sub-matrix within the pool
555 requires a complete redisplay of the frame because we cannot easily
556 make sure that the current matrices of all windows still agree with
557 what is displayed on the screen. While this is usually fast, it
558 leads to screen flickering. */
23b0200c 559
5f5c8ee5 560static void
971de7fb 561adjust_glyph_matrix (struct window *w, struct glyph_matrix *matrix, int x, int y, struct dim dim)
5f5c8ee5
GM
562{
563 int i;
564 int new_rows;
565 int marginal_areas_changed_p = 0;
045dee35
GM
566 int header_line_changed_p = 0;
567 int header_line_p = 0;
5f5c8ee5 568 int left = -1, right = -1;
ca8a12a7 569 int window_width = -1, window_height = -1;
5f5c8ee5 570
6b61353c
KH
571 /* See if W had a header line that has disappeared now, or vice versa.
572 Get W's size. */
5f5c8ee5
GM
573 if (w)
574 {
6b61353c
KH
575 window_box (w, -1, 0, 0, &window_width, &window_height);
576
045dee35
GM
577 header_line_p = WINDOW_WANTS_HEADER_LINE_P (w);
578 header_line_changed_p = header_line_p != matrix->header_line_p;
5f5c8ee5 579 }
045dee35 580 matrix->header_line_p = header_line_p;
23b0200c 581
6b61353c
KH
582 /* If POOL is null, MATRIX is a window matrix for window-based redisplay.
583 Do nothing if MATRIX' size, position, vscroll, and marginal areas
5f5c8ee5
GM
584 haven't changed. This optimization is important because preserving
585 the matrix means preventing redisplay. */
586 if (matrix->pool == NULL)
587 {
7df02016
KS
588 left = margin_glyphs_to_reserve (w, dim.width, w->left_margin_cols);
589 right = margin_glyphs_to_reserve (w, dim.width, w->right_margin_cols);
5f5c8ee5
GM
590 xassert (left >= 0 && right >= 0);
591 marginal_areas_changed_p = (left != matrix->left_margin_glyphs
592 || right != matrix->right_margin_glyphs);
593
594 if (!marginal_areas_changed_p
595 && !fonts_changed_p
045dee35 596 && !header_line_changed_p
7df02016
KS
597 && matrix->window_left_col == WINDOW_LEFT_EDGE_COL (w)
598 && matrix->window_top_line == WINDOW_TOP_EDGE_LINE (w)
5f5c8ee5
GM
599 && matrix->window_height == window_height
600 && matrix->window_vscroll == w->vscroll
601 && matrix->window_width == window_width)
602 return;
603 }
177c0ea7 604
5f5c8ee5
GM
605 /* Enlarge MATRIX->rows if necessary. New rows are cleared. */
606 if (matrix->rows_allocated < dim.height)
607 {
608 int size = dim.height * sizeof (struct glyph_row);
609 new_rows = dim.height - matrix->rows_allocated;
610 matrix->rows = (struct glyph_row *) xrealloc (matrix->rows, size);
72af86bd
AS
611 memset (matrix->rows + matrix->rows_allocated, 0,
612 new_rows * sizeof *matrix->rows);
5f5c8ee5
GM
613 matrix->rows_allocated = dim.height;
614 }
615 else
616 new_rows = 0;
60a8948a 617
5f5c8ee5
GM
618 /* If POOL is not null, MATRIX is a frame matrix or a window matrix
619 on a frame not using window-based redisplay. Set up pointers for
620 each row into the glyph pool. */
621 if (matrix->pool)
622 {
623 xassert (matrix->pool->glyphs);
177c0ea7 624
5f5c8ee5 625 if (w)
60a8948a 626 {
5f5c8ee5 627 left = margin_glyphs_to_reserve (w, dim.width,
7df02016 628 w->left_margin_cols);
5f5c8ee5 629 right = margin_glyphs_to_reserve (w, dim.width,
7df02016 630 w->right_margin_cols);
60a8948a 631 }
5f5c8ee5
GM
632 else
633 left = right = 0;
177c0ea7 634
5f5c8ee5 635 for (i = 0; i < dim.height; ++i)
60a8948a 636 {
5f5c8ee5 637 struct glyph_row *row = &matrix->rows[i];
177c0ea7
JB
638
639 row->glyphs[LEFT_MARGIN_AREA]
5f5c8ee5
GM
640 = (matrix->pool->glyphs
641 + (y + i) * matrix->pool->ncolumns
642 + x);
177c0ea7 643
5f5c8ee5
GM
644 if (w == NULL
645 || row == matrix->rows + dim.height - 1
045dee35 646 || (row == matrix->rows && matrix->header_line_p))
5f5c8ee5
GM
647 {
648 row->glyphs[TEXT_AREA]
649 = row->glyphs[LEFT_MARGIN_AREA];
650 row->glyphs[RIGHT_MARGIN_AREA]
651 = row->glyphs[TEXT_AREA] + dim.width;
652 row->glyphs[LAST_AREA]
653 = row->glyphs[RIGHT_MARGIN_AREA];
654 }
655 else
656 {
657 row->glyphs[TEXT_AREA]
658 = row->glyphs[LEFT_MARGIN_AREA] + left;
659 row->glyphs[RIGHT_MARGIN_AREA]
660 = row->glyphs[TEXT_AREA] + dim.width - left - right;
661 row->glyphs[LAST_AREA]
662 = row->glyphs[LEFT_MARGIN_AREA] + dim.width;
663 }
60a8948a 664 }
177c0ea7 665
5f5c8ee5
GM
666 matrix->left_margin_glyphs = left;
667 matrix->right_margin_glyphs = right;
668 }
669 else
670 {
671 /* If MATRIX->pool is null, MATRIX is responsible for managing
6b61353c
KH
672 its own memory. It is a window matrix for window-based redisplay.
673 Allocate glyph memory from the heap. */
5f5c8ee5
GM
674 if (dim.width > matrix->matrix_w
675 || new_rows
045dee35 676 || header_line_changed_p
5f5c8ee5 677 || marginal_areas_changed_p)
4588ec20 678 {
5f5c8ee5
GM
679 struct glyph_row *row = matrix->rows;
680 struct glyph_row *end = row + matrix->rows_allocated;
177c0ea7 681
5f5c8ee5
GM
682 while (row < end)
683 {
684 row->glyphs[LEFT_MARGIN_AREA]
685 = (struct glyph *) xrealloc (row->glyphs[LEFT_MARGIN_AREA],
686 (dim.width
687 * sizeof (struct glyph)));
177c0ea7 688
5f5c8ee5
GM
689 /* The mode line never has marginal areas. */
690 if (row == matrix->rows + dim.height - 1
045dee35 691 || (row == matrix->rows && matrix->header_line_p))
5f5c8ee5
GM
692 {
693 row->glyphs[TEXT_AREA]
694 = row->glyphs[LEFT_MARGIN_AREA];
695 row->glyphs[RIGHT_MARGIN_AREA]
696 = row->glyphs[TEXT_AREA] + dim.width;
697 row->glyphs[LAST_AREA]
698 = row->glyphs[RIGHT_MARGIN_AREA];
699 }
700 else
701 {
702 row->glyphs[TEXT_AREA]
703 = row->glyphs[LEFT_MARGIN_AREA] + left;
704 row->glyphs[RIGHT_MARGIN_AREA]
705 = row->glyphs[TEXT_AREA] + dim.width - left - right;
706 row->glyphs[LAST_AREA]
707 = row->glyphs[LEFT_MARGIN_AREA] + dim.width;
708 }
709 ++row;
710 }
4588ec20
JB
711 }
712
5f5c8ee5
GM
713 xassert (left >= 0 && right >= 0);
714 matrix->left_margin_glyphs = left;
715 matrix->right_margin_glyphs = right;
716 }
177c0ea7 717
5f5c8ee5
GM
718 /* Number of rows to be used by MATRIX. */
719 matrix->nrows = dim.height;
3ed36514 720 xassert (matrix->nrows >= 0);
5f5c8ee5 721
b7b20fbd 722 if (w)
5f5c8ee5 723 {
b7b20fbd 724 if (matrix == w->current_matrix)
4588ec20 725 {
b7b20fbd
GM
726 /* Mark rows in a current matrix of a window as not having
727 valid contents. It's important to not do this for
728 desired matrices. When Emacs starts, it may already be
729 building desired matrices when this function runs. */
730 if (window_width < 0)
731 window_width = window_box_width (w, -1);
177c0ea7 732
b7b20fbd
GM
733 /* Optimize the case that only the height has changed (C-x 2,
734 upper window). Invalidate all rows that are no longer part
735 of the window. */
736 if (!marginal_areas_changed_p
73d75a62
GM
737 && !header_line_changed_p
738 && new_rows == 0
739 && dim.width == matrix->matrix_w
7df02016
KS
740 && matrix->window_left_col == WINDOW_LEFT_EDGE_COL (w)
741 && matrix->window_top_line == WINDOW_TOP_EDGE_LINE (w)
73d75a62 742 && matrix->window_width == window_width)
b7b20fbd 743 {
dd42b31a
GM
744 /* Find the last row in the window. */
745 for (i = 0; i < matrix->nrows && matrix->rows[i].enabled_p; ++i)
746 if (MATRIX_ROW_BOTTOM_Y (matrix->rows + i) >= window_height)
747 {
26447967 748 ++i;
dd42b31a
GM
749 break;
750 }
b7b20fbd
GM
751
752 /* Window end is invalid, if inside of the rows that
dd42b31a 753 are invalidated below. */
b7b20fbd
GM
754 if (INTEGERP (w->window_end_vpos)
755 && XFASTINT (w->window_end_vpos) >= i)
756 w->window_end_valid = Qnil;
177c0ea7 757
b7b20fbd
GM
758 while (i < matrix->nrows)
759 matrix->rows[i++].enabled_p = 0;
760 }
761 else
762 {
763 for (i = 0; i < matrix->nrows; ++i)
764 matrix->rows[i].enabled_p = 0;
765 }
5f5c8ee5 766 }
b7b20fbd 767 else if (matrix == w->desired_matrix)
5f5c8ee5 768 {
b7b20fbd
GM
769 /* Rows in desired matrices always have to be cleared;
770 redisplay expects this is the case when it runs, so it
771 had better be the case when we adjust matrices between
772 redisplays. */
5f5c8ee5
GM
773 for (i = 0; i < matrix->nrows; ++i)
774 matrix->rows[i].enabled_p = 0;
4588ec20 775 }
4588ec20 776 }
177c0ea7
JB
777
778
5f5c8ee5
GM
779 /* Remember last values to be able to optimize frame redraws. */
780 matrix->matrix_x = x;
781 matrix->matrix_y = y;
782 matrix->matrix_w = dim.width;
783 matrix->matrix_h = dim.height;
784
785 /* Record the top y location and height of W at the time the matrix
786 was last adjusted. This is used to optimize redisplay above. */
787 if (w)
4588ec20 788 {
7df02016
KS
789 matrix->window_left_col = WINDOW_LEFT_EDGE_COL (w);
790 matrix->window_top_line = WINDOW_TOP_EDGE_LINE (w);
5f5c8ee5
GM
791 matrix->window_height = window_height;
792 matrix->window_width = window_width;
793 matrix->window_vscroll = w->vscroll;
794 }
795}
4588ec20 796
4588ec20 797
5f5c8ee5
GM
798/* Reverse the contents of rows in MATRIX between START and END. The
799 contents of the row at END - 1 end up at START, END - 2 at START +
800 1 etc. This is part of the implementation of rotate_matrix (see
801 below). */
d52bad65 802
5f5c8ee5 803static void
971de7fb 804reverse_rows (struct glyph_matrix *matrix, int start, int end)
5f5c8ee5
GM
805{
806 int i, j;
23b0200c 807
5f5c8ee5
GM
808 for (i = start, j = end - 1; i < j; ++i, --j)
809 {
810 /* Non-ISO HP/UX compiler doesn't like auto struct
811 initialization. */
812 struct glyph_row temp;
813 temp = matrix->rows[i];
814 matrix->rows[i] = matrix->rows[j];
815 matrix->rows[j] = temp;
816 }
817}
23b0200c 818
23b0200c 819
5f5c8ee5
GM
820/* Rotate the contents of rows in MATRIX in the range FIRST .. LAST -
821 1 by BY positions. BY < 0 means rotate left, i.e. towards lower
822 indices. (Note: this does not copy glyphs, only glyph pointers in
823 row structures are moved around).
60a8948a 824
5f5c8ee5
GM
825 The algorithm used for rotating the vector was, I believe, first
826 described by Kernighan. See the vector R as consisting of two
827 sub-vectors AB, where A has length BY for BY >= 0. The result
828 after rotating is then BA. Reverse both sub-vectors to get ArBr
829 and reverse the result to get (ArBr)r which is BA. Similar for
830 rotating right. */
831
832void
971de7fb 833rotate_matrix (struct glyph_matrix *matrix, int first, int last, int by)
5f5c8ee5
GM
834{
835 if (by < 0)
836 {
837 /* Up (rotate left, i.e. towards lower indices). */
838 by = -by;
839 reverse_rows (matrix, first, first + by);
840 reverse_rows (matrix, first + by, last);
841 reverse_rows (matrix, first, last);
842 }
843 else if (by > 0)
844 {
845 /* Down (rotate right, i.e. towards higher indices). */
846 reverse_rows (matrix, last - by, last);
847 reverse_rows (matrix, first, last - by);
848 reverse_rows (matrix, first, last);
849 }
850}
851
852
853/* Increment buffer positions in glyph rows of MATRIX. Do it for rows
854 with indices START <= index < END. Increment positions by DELTA/
855 DELTA_BYTES. */
856
857void
971de7fb 858increment_matrix_positions (struct glyph_matrix *matrix, int start, int end, int delta, int delta_bytes)
5f5c8ee5
GM
859{
860 /* Check that START and END are reasonable values. */
861 xassert (start >= 0 && start <= matrix->nrows);
862 xassert (end >= 0 && end <= matrix->nrows);
863 xassert (start <= end);
864
865 for (; start < end; ++start)
86c11ba1 866 increment_row_positions (matrix->rows + start, delta, delta_bytes);
5f5c8ee5
GM
867}
868
869
870/* Enable a range of rows in glyph matrix MATRIX. START and END are
871 the row indices of the first and last + 1 row to enable. If
872 ENABLED_P is non-zero, enabled_p flags in rows will be set to 1. */
873
874void
971de7fb 875enable_glyph_matrix_rows (struct glyph_matrix *matrix, int start, int end, int enabled_p)
5f5c8ee5 876{
3ed36514
GM
877 xassert (start <= end);
878 xassert (start >= 0 && start < matrix->nrows);
879 xassert (end >= 0 && end <= matrix->nrows);
177c0ea7 880
5f5c8ee5
GM
881 for (; start < end; ++start)
882 matrix->rows[start].enabled_p = enabled_p != 0;
883}
884
885
886/* Clear MATRIX.
887
888 This empties all rows in MATRIX by setting the enabled_p flag for
889 all rows of the matrix to zero. The function prepare_desired_row
890 will eventually really clear a row when it sees one with a zero
891 enabled_p flag.
892
893 Resets update hints to defaults value. The only update hint
894 currently present is the flag MATRIX->no_scrolling_p. */
895
896void
971de7fb 897clear_glyph_matrix (struct glyph_matrix *matrix)
5f5c8ee5
GM
898{
899 if (matrix)
900 {
901 enable_glyph_matrix_rows (matrix, 0, matrix->nrows, 0);
902 matrix->no_scrolling_p = 0;
903 }
904}
177c0ea7 905
5f5c8ee5
GM
906
907/* Shift part of the glyph matrix MATRIX of window W up or down.
908 Increment y-positions in glyph rows between START and END by DY,
909 and recompute their visible height. */
910
911void
971de7fb 912shift_glyph_matrix (struct window *w, struct glyph_matrix *matrix, int start, int end, int dy)
5f5c8ee5
GM
913{
914 int min_y, max_y;
177c0ea7 915
5f5c8ee5
GM
916 xassert (start <= end);
917 xassert (start >= 0 && start < matrix->nrows);
918 xassert (end >= 0 && end <= matrix->nrows);
177c0ea7 919
7df02016
KS
920 min_y = WINDOW_HEADER_LINE_HEIGHT (w);
921 max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (w);
177c0ea7 922
5f5c8ee5
GM
923 for (; start < end; ++start)
924 {
925 struct glyph_row *row = &matrix->rows[start];
177c0ea7 926
5f5c8ee5 927 row->y += dy;
d6c747a4 928 row->visible_height = row->height;
177c0ea7 929
5f5c8ee5 930 if (row->y < min_y)
d6c747a4
GM
931 row->visible_height -= min_y - row->y;
932 if (row->y + row->height > max_y)
933 row->visible_height -= row->y + row->height - max_y;
5f5c8ee5
GM
934 }
935}
936
937
938/* Mark all rows in current matrices of frame F as invalid. Marking
939 invalid is done by setting enabled_p to zero for all rows in a
940 current matrix. */
941
942void
971de7fb 943clear_current_matrices (register struct frame *f)
5f5c8ee5
GM
944{
945 /* Clear frame current matrix, if we have one. */
946 if (f->current_matrix)
947 clear_glyph_matrix (f->current_matrix);
948
949 /* Clear the matrix of the menu bar window, if such a window exists.
950 The menu bar window is currently used to display menus on X when
951 no toolkit support is compiled in. */
952 if (WINDOWP (f->menu_bar_window))
953 clear_glyph_matrix (XWINDOW (f->menu_bar_window)->current_matrix);
954
9ea173e8
GM
955 /* Clear the matrix of the tool-bar window, if any. */
956 if (WINDOWP (f->tool_bar_window))
957 clear_glyph_matrix (XWINDOW (f->tool_bar_window)->current_matrix);
5f5c8ee5
GM
958
959 /* Clear current window matrices. */
960 xassert (WINDOWP (FRAME_ROOT_WINDOW (f)));
961 clear_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)), 0);
962}
963
964
965/* Clear out all display lines of F for a coming redisplay. */
966
967void
971de7fb 968clear_desired_matrices (register struct frame *f)
5f5c8ee5
GM
969{
970 if (f->desired_matrix)
971 clear_glyph_matrix (f->desired_matrix);
177c0ea7 972
5f5c8ee5
GM
973 if (WINDOWP (f->menu_bar_window))
974 clear_glyph_matrix (XWINDOW (f->menu_bar_window)->desired_matrix);
975
9ea173e8
GM
976 if (WINDOWP (f->tool_bar_window))
977 clear_glyph_matrix (XWINDOW (f->tool_bar_window)->desired_matrix);
5f5c8ee5
GM
978
979 /* Do it for window matrices. */
980 xassert (WINDOWP (FRAME_ROOT_WINDOW (f)));
981 clear_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)), 1);
982}
983
984
985/* Clear matrices in window tree rooted in W. If DESIRED_P is
986 non-zero clear desired matrices, otherwise clear current matrices. */
987
988static void
971de7fb 989clear_window_matrices (struct window *w, int desired_p)
5f5c8ee5
GM
990{
991 while (w)
992 {
993 if (!NILP (w->hchild))
994 {
995 xassert (WINDOWP (w->hchild));
996 clear_window_matrices (XWINDOW (w->hchild), desired_p);
997 }
998 else if (!NILP (w->vchild))
999 {
1000 xassert (WINDOWP (w->vchild));
1001 clear_window_matrices (XWINDOW (w->vchild), desired_p);
1002 }
1003 else
1004 {
1005 if (desired_p)
1006 clear_glyph_matrix (w->desired_matrix);
1007 else
1008 {
1009 clear_glyph_matrix (w->current_matrix);
1010 w->window_end_valid = Qnil;
1011 }
1012 }
1013
1014 w = NILP (w->next) ? 0 : XWINDOW (w->next);
1015 }
1016}
1017
1018
1019\f
1020/***********************************************************************
1021 Glyph Rows
1022
1023 See dispextern.h for an overall explanation of glyph rows.
1024 ***********************************************************************/
1025
1026/* Clear glyph row ROW. Do it in a way that makes it robust against
1027 changes in the glyph_row structure, i.e. addition or removal of
1028 structure members. */
1029
2cca872d
KH
1030static struct glyph_row null_row;
1031
5f5c8ee5 1032void
971de7fb 1033clear_glyph_row (struct glyph_row *row)
5f5c8ee5
GM
1034{
1035 struct glyph *p[1 + LAST_AREA];
5f5c8ee5
GM
1036
1037 /* Save pointers. */
1038 p[LEFT_MARGIN_AREA] = row->glyphs[LEFT_MARGIN_AREA];
1039 p[TEXT_AREA] = row->glyphs[TEXT_AREA];
1040 p[RIGHT_MARGIN_AREA] = row->glyphs[RIGHT_MARGIN_AREA];
1041 p[LAST_AREA] = row->glyphs[LAST_AREA];
1042
1043 /* Clear. */
1044 *row = null_row;
1045
1046 /* Restore pointers. */
1047 row->glyphs[LEFT_MARGIN_AREA] = p[LEFT_MARGIN_AREA];
1048 row->glyphs[TEXT_AREA] = p[TEXT_AREA];
1049 row->glyphs[RIGHT_MARGIN_AREA] = p[RIGHT_MARGIN_AREA];
1050 row->glyphs[LAST_AREA] = p[LAST_AREA];
45560b1a
GM
1051
1052#if 0 /* At some point, some bit-fields of struct glyph were not set,
1053 which made glyphs unequal when compared with GLYPH_EQUAL_P.
1054 Redisplay outputs such glyphs, and flickering effects were
1055 the result. This also depended on the contents of memory
1056 returned by xmalloc. If flickering happens again, activate
153a073c 1057 the code below. If the flickering is gone with that, chances
45560b1a 1058 are that the flickering has the same reason as here. */
72af86bd 1059 memset (p[0], 0, (char *) p[LAST_AREA] - (char *) p[0]);
45560b1a 1060#endif
5f5c8ee5
GM
1061}
1062
1063
1064/* Make ROW an empty, enabled row of canonical character height,
1065 in window W starting at y-position Y. */
1066
1067void
971de7fb 1068blank_row (struct window *w, struct glyph_row *row, int y)
5f5c8ee5
GM
1069{
1070 int min_y, max_y;
177c0ea7 1071
7df02016
KS
1072 min_y = WINDOW_HEADER_LINE_HEIGHT (w);
1073 max_y = WINDOW_BOX_HEIGHT_NO_MODE_LINE (w);
177c0ea7 1074
5f5c8ee5
GM
1075 clear_glyph_row (row);
1076 row->y = y;
408f5064 1077 row->ascent = row->phys_ascent = 0;
7df02016 1078 row->height = row->phys_height = FRAME_LINE_HEIGHT (XFRAME (w->frame));
d6c747a4 1079 row->visible_height = row->height;
177c0ea7 1080
5f5c8ee5 1081 if (row->y < min_y)
d6c747a4
GM
1082 row->visible_height -= min_y - row->y;
1083 if (row->y + row->height > max_y)
1084 row->visible_height -= row->y + row->height - max_y;
5f5c8ee5
GM
1085
1086 row->enabled_p = 1;
1087}
1088
1089
1090/* Increment buffer positions in glyph row ROW. DELTA and DELTA_BYTES
1091 are the amounts by which to change positions. Note that the first
1092 glyph of the text area of a row can have a buffer position even if
1093 the used count of the text area is zero. Such rows display line
1094 ends. */
1095
1096void
971de7fb 1097increment_row_positions (struct glyph_row *row, int delta, int delta_bytes)
5f5c8ee5
GM
1098{
1099 int area, i;
1100
1101 /* Increment start and end positions. */
1102 MATRIX_ROW_START_CHARPOS (row) += delta;
1103 MATRIX_ROW_START_BYTEPOS (row) += delta_bytes;
1104 MATRIX_ROW_END_CHARPOS (row) += delta;
1105 MATRIX_ROW_END_BYTEPOS (row) += delta_bytes;
d36fe237
EZ
1106 CHARPOS (row->start.pos) += delta;
1107 BYTEPOS (row->start.pos) += delta_bytes;
1108 CHARPOS (row->end.pos) += delta;
1109 BYTEPOS (row->end.pos) += delta_bytes;
5f5c8ee5 1110
5cacdcfd
KS
1111 if (!row->enabled_p)
1112 return;
1113
5f5c8ee5
GM
1114 /* Increment positions in glyphs. */
1115 for (area = 0; area < LAST_AREA; ++area)
1116 for (i = 0; i < row->used[area]; ++i)
1117 if (BUFFERP (row->glyphs[area][i].object)
1118 && row->glyphs[area][i].charpos > 0)
1119 row->glyphs[area][i].charpos += delta;
1120
1121 /* Capture the case of rows displaying a line end. */
1122 if (row->used[TEXT_AREA] == 0
1123 && MATRIX_ROW_DISPLAYS_TEXT_P (row))
1124 row->glyphs[TEXT_AREA]->charpos += delta;
1125}
1126
1127
9af3e742 1128#if 0
5f5c8ee5
GM
1129/* Swap glyphs between two glyph rows A and B. This exchanges glyph
1130 contents, i.e. glyph structure contents are exchanged between A and
1131 B without changing glyph pointers in A and B. */
1132
1133static void
1134swap_glyphs_in_rows (a, b)
1135 struct glyph_row *a, *b;
1136{
1137 int area;
1138
1139 for (area = 0; area < LAST_AREA; ++area)
1140 {
1141 /* Number of glyphs to swap. */
1142 int max_used = max (a->used[area], b->used[area]);
1143
1144 /* Start of glyphs in area of row A. */
1145 struct glyph *glyph_a = a->glyphs[area];
1146
1147 /* End + 1 of glyphs in area of row A. */
1148 struct glyph *glyph_a_end = a->glyphs[max_used];
1149
1150 /* Start of glyphs in area of row B. */
1151 struct glyph *glyph_b = b->glyphs[area];
1152
1153 while (glyph_a < glyph_a_end)
1154 {
1155 /* Non-ISO HP/UX compiler doesn't like auto struct
1156 initialization. */
1157 struct glyph temp;
1158 temp = *glyph_a;
1159 *glyph_a = *glyph_b;
1160 *glyph_b = temp;
1161 ++glyph_a;
1162 ++glyph_b;
1163 }
1164 }
1165}
1166
9af3e742 1167#endif /* 0 */
5f5c8ee5
GM
1168
1169/* Exchange pointers to glyph memory between glyph rows A and B. */
1170
1171static INLINE void
971de7fb 1172swap_glyph_pointers (struct glyph_row *a, struct glyph_row *b)
5f5c8ee5
GM
1173{
1174 int i;
1175 for (i = 0; i < LAST_AREA + 1; ++i)
1176 {
1177 struct glyph *temp = a->glyphs[i];
1178 a->glyphs[i] = b->glyphs[i];
1179 b->glyphs[i] = temp;
1180 }
1181}
1182
1183
1184/* Copy glyph row structure FROM to glyph row structure TO, except
1185 that glyph pointers in the structures are left unchanged. */
1186
1187INLINE void
971de7fb 1188copy_row_except_pointers (struct glyph_row *to, struct glyph_row *from)
5f5c8ee5
GM
1189{
1190 struct glyph *pointers[1 + LAST_AREA];
1191
1192 /* Save glyph pointers of TO. */
72af86bd 1193 memcpy (pointers, to->glyphs, sizeof to->glyphs);
5f5c8ee5
GM
1194
1195 /* Do a structure assignment. */
1196 *to = *from;
1197
1198 /* Restore original pointers of TO. */
72af86bd 1199 memcpy (to->glyphs, pointers, sizeof to->glyphs);
5f5c8ee5
GM
1200}
1201
1202
1203/* Copy contents of glyph row FROM to glyph row TO. Glyph pointers in
1204 TO and FROM are left unchanged. Glyph contents are copied from the
1205 glyph memory of FROM to the glyph memory of TO. Increment buffer
1206 positions in row TO by DELTA/ DELTA_BYTES. */
1207
1208void
971de7fb 1209copy_glyph_row_contents (struct glyph_row *to, struct glyph_row *from, int delta, int delta_bytes)
5f5c8ee5
GM
1210{
1211 int area;
1212
1213 /* This is like a structure assignment TO = FROM, except that
1214 glyph pointers in the rows are left unchanged. */
1215 copy_row_except_pointers (to, from);
1216
1217 /* Copy glyphs from FROM to TO. */
1218 for (area = 0; area < LAST_AREA; ++area)
1219 if (from->used[area])
72af86bd
AS
1220 memcpy (to->glyphs[area], from->glyphs[area],
1221 from->used[area] * sizeof (struct glyph));
5f5c8ee5
GM
1222
1223 /* Increment buffer positions in TO by DELTA. */
86c11ba1 1224 increment_row_positions (to, delta, delta_bytes);
5f5c8ee5
GM
1225}
1226
1227
1228/* Assign glyph row FROM to glyph row TO. This works like a structure
1229 assignment TO = FROM, except that glyph pointers are not copied but
1230 exchanged between TO and FROM. Pointers must be exchanged to avoid
1231 a memory leak. */
1232
1233static INLINE void
971de7fb 1234assign_row (struct glyph_row *to, struct glyph_row *from)
5f5c8ee5
GM
1235{
1236 swap_glyph_pointers (to, from);
1237 copy_row_except_pointers (to, from);
1238}
1239
1240
1241/* Test whether the glyph memory of the glyph row WINDOW_ROW, which is
1242 a row in a window matrix, is a slice of the glyph memory of the
1243 glyph row FRAME_ROW which is a row in a frame glyph matrix. Value
1244 is non-zero if the glyph memory of WINDOW_ROW is part of the glyph
1245 memory of FRAME_ROW. */
1246
2d5912c1 1247#if GLYPH_DEBUG
9339e87f 1248
5f5c8ee5
GM
1249static int
1250glyph_row_slice_p (window_row, frame_row)
1251 struct glyph_row *window_row, *frame_row;
1252{
1253 struct glyph *window_glyph_start = window_row->glyphs[0];
1254 struct glyph *frame_glyph_start = frame_row->glyphs[0];
1255 struct glyph *frame_glyph_end = frame_row->glyphs[LAST_AREA];
1256
1257 return (frame_glyph_start <= window_glyph_start
1258 && window_glyph_start < frame_glyph_end);
1259}
1260
9339e87f 1261#endif /* GLYPH_DEBUG */
5f5c8ee5 1262
9af3e742
GM
1263#if 0
1264
5f5c8ee5
GM
1265/* Find the row in the window glyph matrix WINDOW_MATRIX being a slice
1266 of ROW in the frame matrix FRAME_MATRIX. Value is null if no row
1267 in WINDOW_MATRIX is found satisfying the condition. */
1268
1269static struct glyph_row *
1270find_glyph_row_slice (window_matrix, frame_matrix, row)
1271 struct glyph_matrix *window_matrix, *frame_matrix;
1272 int row;
1273{
1274 int i;
1275
1276 xassert (row >= 0 && row < frame_matrix->nrows);
1277
1278 for (i = 0; i < window_matrix->nrows; ++i)
1279 if (glyph_row_slice_p (window_matrix->rows + i,
1280 frame_matrix->rows + row))
1281 break;
1282
1283 return i < window_matrix->nrows ? window_matrix->rows + i : 0;
1284}
1285
9af3e742 1286#endif /* 0 */
5f5c8ee5
GM
1287
1288/* Prepare ROW for display. Desired rows are cleared lazily,
1289 i.e. they are only marked as to be cleared by setting their
1290 enabled_p flag to zero. When a row is to be displayed, a prior
1291 call to this function really clears it. */
1292
1293void
971de7fb 1294prepare_desired_row (struct glyph_row *row)
5f5c8ee5
GM
1295{
1296 if (!row->enabled_p)
1297 {
5009f85e
EZ
1298 unsigned rp = row->reversed_p;
1299
5f5c8ee5
GM
1300 clear_glyph_row (row);
1301 row->enabled_p = 1;
5009f85e 1302 row->reversed_p = rp;
5f5c8ee5
GM
1303 }
1304}
1305
1306
1307/* Return a hash code for glyph row ROW. */
1308
1309int
971de7fb 1310line_hash_code (struct glyph_row *row)
5f5c8ee5
GM
1311{
1312 int hash = 0;
177c0ea7 1313
5f5c8ee5
GM
1314 if (row->enabled_p)
1315 {
4cecaab8
MB
1316 struct glyph *glyph = row->glyphs[TEXT_AREA];
1317 struct glyph *end = glyph + row->used[TEXT_AREA];
1318
1319 while (glyph < end)
1320 {
1321 int c = glyph->u.ch;
1322 int face_id = glyph->face_id;
daf01701 1323 if (FRAME_MUST_WRITE_SPACES (SELECTED_FRAME ())) /* XXX Is SELECTED_FRAME OK here? */
4cecaab8
MB
1324 c -= SPACEGLYPH;
1325 hash = (((hash << 4) + (hash >> 24)) & 0x0fffffff) + c;
1326 hash = (((hash << 4) + (hash >> 24)) & 0x0fffffff) + face_id;
1327 ++glyph;
1328 }
5f5c8ee5 1329
4cecaab8
MB
1330 if (hash == 0)
1331 hash = 1;
5f5c8ee5
GM
1332 }
1333
1334 return hash;
1335}
1336
1337
153a073c 1338/* Return the cost of drawing line VPOS in MATRIX. The cost equals
5f5c8ee5
GM
1339 the number of characters in the line. If must_write_spaces is
1340 zero, leading and trailing spaces are ignored. */
1341
1342static unsigned int
971de7fb 1343line_draw_cost (struct glyph_matrix *matrix, int vpos)
5f5c8ee5
GM
1344{
1345 struct glyph_row *row = matrix->rows + vpos;
1346 struct glyph *beg = row->glyphs[TEXT_AREA];
1347 struct glyph *end = beg + row->used[TEXT_AREA];
1348 int len;
1349 Lisp_Object *glyph_table_base = GLYPH_TABLE_BASE;
1350 int glyph_table_len = GLYPH_TABLE_LENGTH;
1351
1352 /* Ignore trailing and leading spaces if we can. */
daf01701 1353 if (!FRAME_MUST_WRITE_SPACES (SELECTED_FRAME ())) /* XXX Is SELECTED_FRAME OK here? */
5f5c8ee5
GM
1354 {
1355 /* Skip from the end over trailing spaces. */
2b4ec4d7 1356 while (end > beg && CHAR_GLYPH_SPACE_P (*(end - 1)))
5f5c8ee5
GM
1357 --end;
1358
177c0ea7 1359 /* All blank line. */
5f5c8ee5
GM
1360 if (end == beg)
1361 return 0;
1362
1363 /* Skip over leading spaces. */
1364 while (CHAR_GLYPH_SPACE_P (*beg))
1365 ++beg;
1366 }
1367
1368 /* If we don't have a glyph-table, each glyph is one character,
1369 so return the number of glyphs. */
1370 if (glyph_table_base == 0)
1371 len = end - beg;
1372 else
1373 {
1374 /* Otherwise, scan the glyphs and accumulate their total length
1375 in LEN. */
1376 len = 0;
1377 while (beg < end)
1378 {
3fc809e2 1379 GLYPH g;
177c0ea7 1380
3fc809e2
KS
1381 SET_GLYPH_FROM_CHAR_GLYPH (g, *beg);
1382
565b39a8 1383 if (GLYPH_INVALID_P (g)
42186983 1384 || GLYPH_SIMPLE_P (glyph_table_base, glyph_table_len, g))
5f5c8ee5
GM
1385 len += 1;
1386 else
1387 len += GLYPH_LENGTH (glyph_table_base, g);
177c0ea7 1388
5f5c8ee5
GM
1389 ++beg;
1390 }
1391 }
177c0ea7 1392
5f5c8ee5
GM
1393 return len;
1394}
1395
1396
1397/* Test two glyph rows A and B for equality. Value is non-zero if A
1398 and B have equal contents. W is the window to which the glyphs
1399 rows A and B belong. It is needed here to test for partial row
e4e0bee9
GM
1400 visibility. MOUSE_FACE_P non-zero means compare the mouse_face_p
1401 flags of A and B, too. */
5f5c8ee5 1402
177c0ea7 1403static INLINE int
971de7fb 1404row_equal_p (struct window *w, struct glyph_row *a, struct glyph_row *b, int mouse_face_p)
5f5c8ee5
GM
1405{
1406 if (a == b)
1407 return 1;
1408 else if (a->hash != b->hash)
1409 return 0;
1410 else
1411 {
1412 struct glyph *a_glyph, *b_glyph, *a_end;
1413 int area;
1414
e4e0bee9
GM
1415 if (mouse_face_p && a->mouse_face_p != b->mouse_face_p)
1416 return 0;
1417
5f5c8ee5
GM
1418 /* Compare glyphs. */
1419 for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area)
1420 {
1421 if (a->used[area] != b->used[area])
1422 return 0;
177c0ea7 1423
5f5c8ee5
GM
1424 a_glyph = a->glyphs[area];
1425 a_end = a_glyph + a->used[area];
1426 b_glyph = b->glyphs[area];
177c0ea7 1427
5f5c8ee5
GM
1428 while (a_glyph < a_end
1429 && GLYPH_EQUAL_P (a_glyph, b_glyph))
1430 ++a_glyph, ++b_glyph;
177c0ea7 1431
5f5c8ee5
GM
1432 if (a_glyph != a_end)
1433 return 0;
1434 }
1435
6b61353c
KH
1436 if (a->fill_line_p != b->fill_line_p
1437 || a->cursor_in_fringe_p != b->cursor_in_fringe_p
1438 || a->left_fringe_bitmap != b->left_fringe_bitmap
1439 || a->left_fringe_face_id != b->left_fringe_face_id
1440 || a->right_fringe_bitmap != b->right_fringe_bitmap
1441 || a->right_fringe_face_id != b->right_fringe_face_id
3d4a365f 1442 || a->overlay_arrow_bitmap != b->overlay_arrow_bitmap
6b61353c 1443 || a->exact_window_width_line_p != b->exact_window_width_line_p
408f5064 1444 || a->overlapped_p != b->overlapped_p
5f5c8ee5
GM
1445 || (MATRIX_ROW_CONTINUATION_LINE_P (a)
1446 != MATRIX_ROW_CONTINUATION_LINE_P (b))
918f4159 1447 || a->reversed_p != b->reversed_p
5f5c8ee5
GM
1448 /* Different partially visible characters on left margin. */
1449 || a->x != b->x
1450 /* Different height. */
1451 || a->ascent != b->ascent
408f5064
GM
1452 || a->phys_ascent != b->phys_ascent
1453 || a->phys_height != b->phys_height
5f5c8ee5
GM
1454 || a->visible_height != b->visible_height)
1455 return 0;
1456 }
1457
1458 return 1;
1459}
1460
1461
1462\f
1463/***********************************************************************
1464 Glyph Pool
1465
1466 See dispextern.h for an overall explanation of glyph pools.
1467 ***********************************************************************/
1468
1469/* Allocate a glyph_pool structure. The structure returned is
1470 initialized with zeros. The global variable glyph_pool_count is
1471 incremented for each pool allocated. */
1472
1473static struct glyph_pool *
971de7fb 1474new_glyph_pool (void)
5f5c8ee5
GM
1475{
1476 struct glyph_pool *result;
1477
1478 /* Allocate a new glyph_pool and clear it. */
1479 result = (struct glyph_pool *) xmalloc (sizeof *result);
72af86bd 1480 memset (result, 0, sizeof *result);
177c0ea7 1481
5f5c8ee5
GM
1482 /* For memory leak and double deletion checking. */
1483 ++glyph_pool_count;
177c0ea7 1484
5f5c8ee5
GM
1485 return result;
1486}
1487
1488
1489/* Free a glyph_pool structure POOL. The function may be called with
1490 a null POOL pointer. The global variable glyph_pool_count is
1491 decremented with every pool structure freed. If this count gets
1492 negative, more structures were freed than allocated, i.e. one
1493 structure must have been freed more than once or a bogus pointer
1494 was passed to free_glyph_pool. */
1495
1496static void
971de7fb 1497free_glyph_pool (struct glyph_pool *pool)
5f5c8ee5
GM
1498{
1499 if (pool)
1500 {
153a073c 1501 /* More freed than allocated? */
5f5c8ee5
GM
1502 --glyph_pool_count;
1503 xassert (glyph_pool_count >= 0);
1504
1505 xfree (pool->glyphs);
1506 xfree (pool);
1507 }
1508}
1509
1510
1511/* Enlarge a glyph pool POOL. MATRIX_DIM gives the number of rows and
1512 columns we need. This function never shrinks a pool. The only
1513 case in which this would make sense, would be when a frame's size
1514 is changed from a large value to a smaller one. But, if someone
1515 does it once, we can expect that he will do it again.
1516
1517 Value is non-zero if the pool changed in a way which makes
1518 re-adjusting window glyph matrices necessary. */
1519
1520static int
971de7fb 1521realloc_glyph_pool (struct glyph_pool *pool, struct dim matrix_dim)
5f5c8ee5
GM
1522{
1523 int needed;
1524 int changed_p;
1525
1526 changed_p = (pool->glyphs == 0
1527 || matrix_dim.height != pool->nrows
1528 || matrix_dim.width != pool->ncolumns);
1529
1530 /* Enlarge the glyph pool. */
1531 needed = matrix_dim.width * matrix_dim.height;
1532 if (needed > pool->nglyphs)
1533 {
1534 int size = needed * sizeof (struct glyph);
1535
1536 if (pool->glyphs)
1537 pool->glyphs = (struct glyph *) xrealloc (pool->glyphs, size);
1538 else
1539 {
1540 pool->glyphs = (struct glyph *) xmalloc (size);
72af86bd 1541 memset (pool->glyphs, 0, size);
5f5c8ee5
GM
1542 }
1543
1544 pool->nglyphs = needed;
1545 }
1546
153a073c 1547 /* Remember the number of rows and columns because (a) we use them
5f5c8ee5
GM
1548 to do sanity checks, and (b) the number of columns determines
1549 where rows in the frame matrix start---this must be available to
1550 determine pointers to rows of window sub-matrices. */
1551 pool->nrows = matrix_dim.height;
1552 pool->ncolumns = matrix_dim.width;
177c0ea7 1553
5f5c8ee5
GM
1554 return changed_p;
1555}
1556
1557
1558\f
1559/***********************************************************************
1560 Debug Code
1561 ***********************************************************************/
1562
1563#if GLYPH_DEBUG
1564
a13396c9 1565
28d440ab
KL
1566/* Flush standard output. This is sometimes useful to call from the debugger.
1567 XXX Maybe this should be changed to flush the current terminal instead of
1568 stdout.
1569*/
a13396c9
GM
1570
1571void
1572flush_stdout ()
1573{
1574 fflush (stdout);
1575}
1576
1577
5f5c8ee5
GM
1578/* Check that no glyph pointers have been lost in MATRIX. If a
1579 pointer has been lost, e.g. by using a structure assignment between
1580 rows, at least one pointer must occur more than once in the rows of
1581 MATRIX. */
1582
1583void
1584check_matrix_pointer_lossage (matrix)
1585 struct glyph_matrix *matrix;
1586{
1587 int i, j;
177c0ea7 1588
5f5c8ee5
GM
1589 for (i = 0; i < matrix->nrows; ++i)
1590 for (j = 0; j < matrix->nrows; ++j)
1591 xassert (i == j
1592 || (matrix->rows[i].glyphs[TEXT_AREA]
1593 != matrix->rows[j].glyphs[TEXT_AREA]));
1594}
1595
1596
1597/* Get a pointer to glyph row ROW in MATRIX, with bounds checks. */
1598
1599struct glyph_row *
1600matrix_row (matrix, row)
1601 struct glyph_matrix *matrix;
1602 int row;
1603{
1604 xassert (matrix && matrix->rows);
1605 xassert (row >= 0 && row < matrix->nrows);
1606
1607 /* That's really too slow for normal testing because this function
1608 is called almost everywhere. Although---it's still astonishingly
1609 fast, so it is valuable to have for debugging purposes. */
1610#if 0
1611 check_matrix_pointer_lossage (matrix);
1612#endif
177c0ea7 1613
5f5c8ee5
GM
1614 return matrix->rows + row;
1615}
1616
1617
1618#if 0 /* This function makes invalid assumptions when text is
1619 partially invisible. But it might come handy for debugging
1620 nevertheless. */
1621
1622/* Check invariants that must hold for an up to date current matrix of
1623 window W. */
1624
1625static void
1626check_matrix_invariants (w)
1627 struct window *w;
1628{
1629 struct glyph_matrix *matrix = w->current_matrix;
1630 int yb = window_text_bottom_y (w);
1631 struct glyph_row *row = matrix->rows;
1632 struct glyph_row *last_text_row = NULL;
1633 struct buffer *saved = current_buffer;
1634 struct buffer *buffer = XBUFFER (w->buffer);
1635 int c;
177c0ea7 1636
5f5c8ee5
GM
1637 /* This can sometimes happen for a fresh window. */
1638 if (matrix->nrows < 2)
1639 return;
1640
1641 set_buffer_temp (buffer);
1642
1643 /* Note: last row is always reserved for the mode line. */
1644 while (MATRIX_ROW_DISPLAYS_TEXT_P (row)
1645 && MATRIX_ROW_BOTTOM_Y (row) < yb)
1646 {
1647 struct glyph_row *next = row + 1;
1648
1649 if (MATRIX_ROW_DISPLAYS_TEXT_P (row))
1650 last_text_row = row;
1651
1652 /* Check that character and byte positions are in sync. */
1653 xassert (MATRIX_ROW_START_BYTEPOS (row)
1654 == CHAR_TO_BYTE (MATRIX_ROW_START_CHARPOS (row)));
d36fe237
EZ
1655 xassert (BYTEPOS (row->start.pos)
1656 == CHAR_TO_BYTE (CHARPOS (row->start.pos)));
5f5c8ee5
GM
1657
1658 /* CHAR_TO_BYTE aborts when invoked for a position > Z. We can
1659 have such a position temporarily in case of a minibuffer
1660 displaying something like `[Sole completion]' at its end. */
1661 if (MATRIX_ROW_END_CHARPOS (row) < BUF_ZV (current_buffer))
d36fe237
EZ
1662 {
1663 xassert (MATRIX_ROW_END_BYTEPOS (row)
1664 == CHAR_TO_BYTE (MATRIX_ROW_END_CHARPOS (row)));
1665 xassert (BYTEPOS (row->end.pos)
1666 == CHAR_TO_BYTE (CHARPOS (row->end.pos)));
1667 }
5f5c8ee5
GM
1668
1669 /* Check that end position of `row' is equal to start position
1670 of next row. */
1671 if (next->enabled_p && MATRIX_ROW_DISPLAYS_TEXT_P (next))
1672 {
1673 xassert (MATRIX_ROW_END_CHARPOS (row)
1674 == MATRIX_ROW_START_CHARPOS (next));
1675 xassert (MATRIX_ROW_END_BYTEPOS (row)
1676 == MATRIX_ROW_START_BYTEPOS (next));
d36fe237
EZ
1677 xassert (CHARPOS (row->end.pos) == CHARPOS (next->start.pos));
1678 xassert (BYTEPOS (row->end.pos) == BYTEPOS (next->start.pos));
5f5c8ee5
GM
1679 }
1680 row = next;
1681 }
1682
1683 xassert (w->current_matrix->nrows == w->desired_matrix->nrows);
1684 xassert (w->desired_matrix->rows != NULL);
1685 set_buffer_temp (saved);
1686}
1687
1688#endif /* 0 */
1689
1690#endif /* GLYPH_DEBUG != 0 */
1691
1692
1693\f
1694/**********************************************************************
1695 Allocating/ Adjusting Glyph Matrices
1696 **********************************************************************/
1697
1698/* Allocate glyph matrices over a window tree for a frame-based
1699 redisplay
1700
1701 X and Y are column/row within the frame glyph matrix where
1702 sub-matrices for the window tree rooted at WINDOW must be
8ce2650d
YM
1703 allocated. DIM_ONLY_P non-zero means that the caller of this
1704 function is only interested in the result matrix dimension, and
1705 matrix adjustments should not be performed.
5f5c8ee5
GM
1706
1707 The function returns the total width/height of the sub-matrices of
1708 the window tree. If called on a frame root window, the computation
1709 will take the mini-buffer window into account.
1710
1711 *WINDOW_CHANGE_FLAGS is set to a bit mask with bits
1712
1713 NEW_LEAF_MATRIX set if any window in the tree did not have a
1714 glyph matrices yet, and
1715
1716 CHANGED_LEAF_MATRIX set if the dimension or location of a matrix of
1717 any window in the tree will be changed or have been changed (see
153a073c 1718 DIM_ONLY_P)
5f5c8ee5
GM
1719
1720 *WINDOW_CHANGE_FLAGS must be initialized by the caller of this
1721 function.
1722
1723 Windows are arranged into chains of windows on the same level
1724 through the next fields of window structures. Such a level can be
1725 either a sequence of horizontally adjacent windows from left to
1726 right, or a sequence of vertically adjacent windows from top to
1727 bottom. Each window in a horizontal sequence can be either a leaf
1728 window or a vertical sequence; a window in a vertical sequence can
1729 be either a leaf or a horizontal sequence. All windows in a
1730 horizontal sequence have the same height, and all windows in a
1731 vertical sequence have the same width.
1732
1733 This function uses, for historical reasons, a more general
1734 algorithm to determine glyph matrix dimensions that would be
1735 necessary.
1736
1737 The matrix height of a horizontal sequence is determined by the
1738 maximum height of any matrix in the sequence. The matrix width of
1739 a horizontal sequence is computed by adding up matrix widths of
1740 windows in the sequence.
1741
1742 |<------- result width ------->|
1743 +---------+----------+---------+ ---
1744 | | | | |
1745 | | | |
1746 +---------+ | | result height
1747 | +---------+
1748 | | |
1749 +----------+ ---
1750
1751 The matrix width of a vertical sequence is the maximum matrix width
1752 of any window in the sequence. Its height is computed by adding up
1753 matrix heights of windows in the sequence.
1754
1755 |<---- result width -->|
1756 +---------+ ---
1757 | | |
1758 | | |
1759 +---------+--+ |
1760 | | |
1761 | | result height
1762 | |
1763 +------------+---------+ |
1764 | | |
1765 | | |
1766 +------------+---------+ --- */
1767
1768/* Bit indicating that a new matrix will be allocated or has been
1769 allocated. */
1770
1771#define NEW_LEAF_MATRIX (1 << 0)
1772
1773/* Bit indicating that a matrix will or has changed its location or
1774 size. */
1775
1776#define CHANGED_LEAF_MATRIX (1 << 1)
1777
1778static struct dim
5d3cc43c
GM
1779allocate_matrices_for_frame_redisplay (window, x, y, dim_only_p,
1780 window_change_flags)
5f5c8ee5
GM
1781 Lisp_Object window;
1782 int x, y;
5f5c8ee5
GM
1783 int dim_only_p;
1784 int *window_change_flags;
1785{
1786 struct frame *f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
1787 int x0 = x, y0 = y;
1788 int wmax = 0, hmax = 0;
1789 struct dim total;
1790 struct dim dim;
1791 struct window *w;
1792 int in_horz_combination_p;
1793
1794 /* What combination is WINDOW part of? Compute this once since the
1795 result is the same for all windows in the `next' chain. The
1796 special case of a root window (parent equal to nil) is treated
1797 like a vertical combination because a root window's `next'
1798 points to the mini-buffer window, if any, which is arranged
1799 vertically below other windows. */
1800 in_horz_combination_p
1801 = (!NILP (XWINDOW (window)->parent)
1802 && !NILP (XWINDOW (XWINDOW (window)->parent)->hchild));
1803
1804 /* For WINDOW and all windows on the same level. */
177c0ea7 1805 do
5f5c8ee5
GM
1806 {
1807 w = XWINDOW (window);
1808
1809 /* Get the dimension of the window sub-matrix for W, depending
153a073c 1810 on whether this is a combination or a leaf window. */
5f5c8ee5 1811 if (!NILP (w->hchild))
177c0ea7 1812 dim = allocate_matrices_for_frame_redisplay (w->hchild, x, y,
5f5c8ee5
GM
1813 dim_only_p,
1814 window_change_flags);
1815 else if (!NILP (w->vchild))
177c0ea7 1816 dim = allocate_matrices_for_frame_redisplay (w->vchild, x, y,
5f5c8ee5
GM
1817 dim_only_p,
1818 window_change_flags);
1819 else
1820 {
1821 /* If not already done, allocate sub-matrix structures. */
1822 if (w->desired_matrix == NULL)
1823 {
1824 w->desired_matrix = new_glyph_matrix (f->desired_pool);
1825 w->current_matrix = new_glyph_matrix (f->current_pool);
1826 *window_change_flags |= NEW_LEAF_MATRIX;
1827 }
177c0ea7 1828
5f5c8ee5
GM
1829 /* Width and height MUST be chosen so that there are no
1830 holes in the frame matrix. */
5d3cc43c
GM
1831 dim.width = required_matrix_width (w);
1832 dim.height = required_matrix_height (w);
5f5c8ee5
GM
1833
1834 /* Will matrix be re-allocated? */
1835 if (x != w->desired_matrix->matrix_x
1836 || y != w->desired_matrix->matrix_y
1837 || dim.width != w->desired_matrix->matrix_w
1838 || dim.height != w->desired_matrix->matrix_h
1839 || (margin_glyphs_to_reserve (w, dim.width,
cc834cf9 1840 w->left_margin_cols)
5f5c8ee5
GM
1841 != w->desired_matrix->left_margin_glyphs)
1842 || (margin_glyphs_to_reserve (w, dim.width,
cc834cf9 1843 w->right_margin_cols)
5f5c8ee5
GM
1844 != w->desired_matrix->right_margin_glyphs))
1845 *window_change_flags |= CHANGED_LEAF_MATRIX;
1846
1847 /* Actually change matrices, if allowed. Do not consider
1848 CHANGED_LEAF_MATRIX computed above here because the pool
1849 may have been changed which we don't now here. We trust
1850 that we only will be called with DIM_ONLY_P != 0 when
1851 necessary. */
1852 if (!dim_only_p)
1853 {
1854 adjust_glyph_matrix (w, w->desired_matrix, x, y, dim);
1855 adjust_glyph_matrix (w, w->current_matrix, x, y, dim);
1856 }
1857 }
1858
1859 /* If we are part of a horizontal combination, advance x for
1860 windows to the right of W; otherwise advance y for windows
1861 below W. */
1862 if (in_horz_combination_p)
1863 x += dim.width;
177c0ea7 1864 else
5f5c8ee5
GM
1865 y += dim.height;
1866
1867 /* Remember maximum glyph matrix dimensions. */
1868 wmax = max (wmax, dim.width);
1869 hmax = max (hmax, dim.height);
1870
1871 /* Next window on same level. */
1872 window = w->next;
1873 }
1874 while (!NILP (window));
1875
1876 /* Set `total' to the total glyph matrix dimension of this window
1877 level. In a vertical combination, the width is the width of the
1878 widest window; the height is the y we finally reached, corrected
1879 by the y we started with. In a horizontal combination, the total
1880 height is the height of the tallest window, and the width is the
1881 x we finally reached, corrected by the x we started with. */
1882 if (in_horz_combination_p)
1883 {
1884 total.width = x - x0;
1885 total.height = hmax;
1886 }
177c0ea7 1887 else
5f5c8ee5
GM
1888 {
1889 total.width = wmax;
1890 total.height = y - y0;
1891 }
1892
1893 return total;
1894}
1895
1896
5d3cc43c
GM
1897/* Return the required height of glyph matrices for window W. */
1898
1899int
971de7fb 1900required_matrix_height (struct window *w)
5d3cc43c
GM
1901{
1902#ifdef HAVE_WINDOW_SYSTEM
1903 struct frame *f = XFRAME (w->frame);
177c0ea7 1904
5d3cc43c
GM
1905 if (FRAME_WINDOW_P (f))
1906 {
1907 int ch_height = FRAME_SMALLEST_FONT_HEIGHT (f);
1ea40aa2 1908 int window_pixel_height = window_box_height (w) + eabs (w->vscroll);
5d3cc43c 1909 return (((window_pixel_height + ch_height - 1)
cc834cf9 1910 / ch_height) * w->nrows_scale_factor
5d3cc43c
GM
1911 /* One partially visible line at the top and
1912 bottom of the window. */
1913 + 2
153a073c 1914 /* 2 for header and mode line. */
5d3cc43c
GM
1915 + 2);
1916 }
1917#endif /* HAVE_WINDOW_SYSTEM */
177c0ea7 1918
7df02016 1919 return WINDOW_TOTAL_LINES (w);
5d3cc43c
GM
1920}
1921
1922
1923/* Return the required width of glyph matrices for window W. */
1924
1925int
971de7fb 1926required_matrix_width (struct window *w)
5d3cc43c
GM
1927{
1928#ifdef HAVE_WINDOW_SYSTEM
1929 struct frame *f = XFRAME (w->frame);
1930 if (FRAME_WINDOW_P (f))
1931 {
1932 int ch_width = FRAME_SMALLEST_CHAR_WIDTH (f);
7df02016 1933 int window_pixel_width = WINDOW_TOTAL_WIDTH (w);
177c0ea7 1934
5d3cc43c
GM
1935 /* Compute number of glyphs needed in a glyph row. */
1936 return (((window_pixel_width + ch_width - 1)
cc834cf9 1937 / ch_width) * w->ncols_scale_factor
5d3cc43c
GM
1938 /* 2 partially visible columns in the text area. */
1939 + 2
1940 /* One partially visible column at the right
1941 edge of each marginal area. */
1942 + 1 + 1);
1943 }
1944#endif /* HAVE_WINDOW_SYSTEM */
1945
7df02016 1946 return XINT (w->total_cols);
5d3cc43c
GM
1947}
1948
1949
5f5c8ee5 1950/* Allocate window matrices for window-based redisplay. W is the
8ce2650d 1951 window whose matrices must be allocated/reallocated. */
177c0ea7 1952
5f5c8ee5 1953static void
971de7fb 1954allocate_matrices_for_window_redisplay (struct window *w)
5f5c8ee5 1955{
5f5c8ee5
GM
1956 while (w)
1957 {
1958 if (!NILP (w->vchild))
5d3cc43c 1959 allocate_matrices_for_window_redisplay (XWINDOW (w->vchild));
5f5c8ee5 1960 else if (!NILP (w->hchild))
5d3cc43c 1961 allocate_matrices_for_window_redisplay (XWINDOW (w->hchild));
5f5c8ee5
GM
1962 else
1963 {
1964 /* W is a leaf window. */
5f5c8ee5
GM
1965 struct dim dim;
1966
1967 /* If matrices are not yet allocated, allocate them now. */
1968 if (w->desired_matrix == NULL)
1969 {
1970 w->desired_matrix = new_glyph_matrix (NULL);
1971 w->current_matrix = new_glyph_matrix (NULL);
1972 }
1973
5d3cc43c
GM
1974 dim.width = required_matrix_width (w);
1975 dim.height = required_matrix_height (w);
5f5c8ee5
GM
1976 adjust_glyph_matrix (w, w->desired_matrix, 0, 0, dim);
1977 adjust_glyph_matrix (w, w->current_matrix, 0, 0, dim);
1978 }
177c0ea7 1979
5f5c8ee5
GM
1980 w = NILP (w->next) ? NULL : XWINDOW (w->next);
1981 }
1982}
1983
1984
1985/* Re-allocate/ re-compute glyph matrices on frame F. If F is null,
1986 do it for all frames; otherwise do it just for the given frame.
1987 This function must be called when a new frame is created, its size
1988 changes, or its window configuration changes. */
1989
1990void
971de7fb 1991adjust_glyphs (struct frame *f)
5f5c8ee5 1992{
408f5064
GM
1993 /* Block input so that expose events and other events that access
1994 glyph matrices are not processed while we are changing them. */
1995 BLOCK_INPUT;
1996
5f5c8ee5
GM
1997 if (f)
1998 adjust_frame_glyphs (f);
1999 else
2000 {
2001 Lisp_Object tail, lisp_frame;
177c0ea7 2002
5f5c8ee5
GM
2003 FOR_EACH_FRAME (tail, lisp_frame)
2004 adjust_frame_glyphs (XFRAME (lisp_frame));
2005 }
408f5064
GM
2006
2007 UNBLOCK_INPUT;
5f5c8ee5
GM
2008}
2009
2010
2011/* Adjust frame glyphs when Emacs is initialized.
177c0ea7
JB
2012
2013 To be called from init_display.
2014
5f5c8ee5
GM
2015 We need a glyph matrix because redraw will happen soon.
2016 Unfortunately, window sizes on selected_frame are not yet set to
2017 meaningful values. I believe we can assume that there are only two
2018 windows on the frame---the mini-buffer and the root window. Frame
2019 height and width seem to be correct so far. So, set the sizes of
2020 windows to estimated values. */
2021
2022static void
971de7fb 2023adjust_frame_glyphs_initially (void)
5f5c8ee5 2024{
91fb7e1b
GM
2025 struct frame *sf = SELECTED_FRAME ();
2026 struct window *root = XWINDOW (sf->root_window);
5f5c8ee5 2027 struct window *mini = XWINDOW (root->next);
7df02016
KS
2028 int frame_lines = FRAME_LINES (sf);
2029 int frame_cols = FRAME_COLS (sf);
91fb7e1b 2030 int top_margin = FRAME_TOP_MARGIN (sf);
5f5c8ee5
GM
2031
2032 /* Do it for the root window. */
7df02016
KS
2033 XSETFASTINT (root->top_line, top_margin);
2034 XSETFASTINT (root->total_cols, frame_cols);
2035 set_window_height (sf->root_window, frame_lines - 1 - top_margin, 0);
5f5c8ee5
GM
2036
2037 /* Do it for the mini-buffer window. */
7df02016
KS
2038 XSETFASTINT (mini->top_line, frame_lines - 1);
2039 XSETFASTINT (mini->total_cols, frame_cols);
5f5c8ee5
GM
2040 set_window_height (root->next, 1, 0);
2041
91fb7e1b 2042 adjust_frame_glyphs (sf);
5f5c8ee5
GM
2043 glyphs_initialized_initially_p = 1;
2044}
177c0ea7 2045
5f5c8ee5
GM
2046
2047/* Allocate/reallocate glyph matrices of a single frame F. */
2048
2049static void
971de7fb 2050adjust_frame_glyphs (struct frame *f)
5f5c8ee5
GM
2051{
2052 if (FRAME_WINDOW_P (f))
2053 adjust_frame_glyphs_for_window_redisplay (f);
2054 else
2055 adjust_frame_glyphs_for_frame_redisplay (f);
177c0ea7 2056
5f5c8ee5
GM
2057 /* Don't forget the message buffer and the buffer for
2058 decode_mode_spec. */
2059 adjust_frame_message_buffer (f);
2060 adjust_decode_mode_spec_buffer (f);
2061
2062 f->glyphs_initialized_p = 1;
2063}
2064
075757cc
CY
2065/* Return 1 if any window in the tree has nonzero window margins. See
2066 the hack at the end of adjust_frame_glyphs_for_frame_redisplay. */
2067static int
971de7fb 2068showing_window_margins_p (struct window *w)
075757cc
CY
2069{
2070 while (w)
2071 {
2072 if (!NILP (w->hchild))
2073 {
2074 if (showing_window_margins_p (XWINDOW (w->hchild)))
2075 return 1;
2076 }
2077 else if (!NILP (w->vchild))
2078 {
2079 if (showing_window_margins_p (XWINDOW (w->vchild)))
2080 return 1;
2081 }
2082 else if (!NILP (w->left_margin_cols)
2083 || !NILP (w->right_margin_cols))
2084 return 1;
3fc809e2 2085
075757cc
CY
2086 w = NILP (w->next) ? 0 : XWINDOW (w->next);
2087 }
2088 return 0;
2089}
2090
5f5c8ee5 2091
c9f00270
GM
2092/* In the window tree with root W, build current matrices of leaf
2093 windows from the frame's current matrix. */
2094
2095static void
971de7fb 2096fake_current_matrices (Lisp_Object window)
c9f00270
GM
2097{
2098 struct window *w;
177c0ea7 2099
c9f00270
GM
2100 for (; !NILP (window); window = w->next)
2101 {
2102 w = XWINDOW (window);
177c0ea7 2103
c9f00270
GM
2104 if (!NILP (w->hchild))
2105 fake_current_matrices (w->hchild);
2106 else if (!NILP (w->vchild))
2107 fake_current_matrices (w->vchild);
2108 else
2109 {
2110 int i;
2111 struct frame *f = XFRAME (w->frame);
2112 struct glyph_matrix *m = w->current_matrix;
2113 struct glyph_matrix *fm = f->current_matrix;
2114
7df02016
KS
2115 xassert (m->matrix_h == WINDOW_TOTAL_LINES (w));
2116 xassert (m->matrix_w == WINDOW_TOTAL_COLS (w));
177c0ea7 2117
c9f00270
GM
2118 for (i = 0; i < m->matrix_h; ++i)
2119 {
2120 struct glyph_row *r = m->rows + i;
7df02016 2121 struct glyph_row *fr = fm->rows + i + WINDOW_TOP_EDGE_LINE (w);
c9f00270
GM
2122
2123 xassert (r->glyphs[TEXT_AREA] >= fr->glyphs[TEXT_AREA]
2124 && r->glyphs[LAST_AREA] <= fr->glyphs[LAST_AREA]);
2125
2126 r->enabled_p = fr->enabled_p;
2127 if (r->enabled_p)
2128 {
2129 r->used[LEFT_MARGIN_AREA] = m->left_margin_glyphs;
2130 r->used[RIGHT_MARGIN_AREA] = m->right_margin_glyphs;
2131 r->used[TEXT_AREA] = (m->matrix_w
2132 - r->used[LEFT_MARGIN_AREA]
2133 - r->used[RIGHT_MARGIN_AREA]);
2134 r->mode_line_p = 0;
c9f00270
GM
2135 }
2136 }
2137 }
2138 }
2139}
2140
2141
bccee4f2 2142/* Save away the contents of frame F's current frame matrix. Value is
153a073c 2143 a glyph matrix holding the contents of F's current frame matrix. */
c9f00270 2144
bccee4f2 2145static struct glyph_matrix *
971de7fb 2146save_current_matrix (struct frame *f)
c9f00270 2147{
bccee4f2
GM
2148 int i;
2149 struct glyph_matrix *saved;
e797dea6 2150
bccee4f2 2151 saved = (struct glyph_matrix *) xmalloc (sizeof *saved);
72af86bd 2152 memset (saved, 0, sizeof *saved);
bccee4f2
GM
2153 saved->nrows = f->current_matrix->nrows;
2154 saved->rows = (struct glyph_row *) xmalloc (saved->nrows
2155 * sizeof *saved->rows);
72af86bd 2156 memset (saved->rows, 0, saved->nrows * sizeof *saved->rows);
bccee4f2
GM
2157
2158 for (i = 0; i < saved->nrows; ++i)
31798cfe 2159 {
bccee4f2
GM
2160 struct glyph_row *from = f->current_matrix->rows + i;
2161 struct glyph_row *to = saved->rows + i;
2162 size_t nbytes = from->used[TEXT_AREA] * sizeof (struct glyph);
2163 to->glyphs[TEXT_AREA] = (struct glyph *) xmalloc (nbytes);
72af86bd 2164 memcpy (to->glyphs[TEXT_AREA], from->glyphs[TEXT_AREA], nbytes);
bccee4f2 2165 to->used[TEXT_AREA] = from->used[TEXT_AREA];
e797dea6 2166 }
bccee4f2
GM
2167
2168 return saved;
2169}
2170
2171
2172/* Restore the contents of frame F's current frame matrix from SAVED,
2173 and free memory associated with SAVED. */
2174
2175static void
971de7fb 2176restore_current_matrix (struct frame *f, struct glyph_matrix *saved)
bccee4f2
GM
2177{
2178 int i;
2179
2180 for (i = 0; i < saved->nrows; ++i)
e797dea6 2181 {
bccee4f2
GM
2182 struct glyph_row *from = saved->rows + i;
2183 struct glyph_row *to = f->current_matrix->rows + i;
e797dea6 2184 size_t nbytes = from->used[TEXT_AREA] * sizeof (struct glyph);
72af86bd 2185 memcpy (to->glyphs[TEXT_AREA], from->glyphs[TEXT_AREA], nbytes);
e797dea6 2186 to->used[TEXT_AREA] = from->used[TEXT_AREA];
bccee4f2 2187 xfree (from->glyphs[TEXT_AREA]);
e797dea6 2188 }
177c0ea7 2189
bccee4f2
GM
2190 xfree (saved->rows);
2191 xfree (saved);
c9f00270
GM
2192}
2193
2194
bccee4f2 2195
5f5c8ee5
GM
2196/* Allocate/reallocate glyph matrices of a single frame F for
2197 frame-based redisplay. */
2198
2199static void
971de7fb 2200adjust_frame_glyphs_for_frame_redisplay (struct frame *f)
5f5c8ee5 2201{
5f5c8ee5
GM
2202 struct dim matrix_dim;
2203 int pool_changed_p;
2204 int window_change_flags;
2205 int top_window_y;
2206
2207 if (!FRAME_LIVE_P (f))
2208 return;
2209
5f5c8ee5
GM
2210 top_window_y = FRAME_TOP_MARGIN (f);
2211
2212 /* Allocate glyph pool structures if not already done. */
2213 if (f->desired_pool == NULL)
2214 {
2215 f->desired_pool = new_glyph_pool ();
2216 f->current_pool = new_glyph_pool ();
2217 }
2218
2219 /* Allocate frames matrix structures if needed. */
2220 if (f->desired_matrix == NULL)
2221 {
2222 f->desired_matrix = new_glyph_matrix (f->desired_pool);
2223 f->current_matrix = new_glyph_matrix (f->current_pool);
2224 }
177c0ea7 2225
5f5c8ee5
GM
2226 /* Compute window glyph matrices. (This takes the mini-buffer
2227 window into account). The result is the size of the frame glyph
2228 matrix needed. The variable window_change_flags is set to a bit
2229 mask indicating whether new matrices will be allocated or
2230 existing matrices change their size or location within the frame
2231 matrix. */
2232 window_change_flags = 0;
2233 matrix_dim
2234 = allocate_matrices_for_frame_redisplay (FRAME_ROOT_WINDOW (f),
2235 0, top_window_y,
5d3cc43c 2236 1,
5f5c8ee5
GM
2237 &window_change_flags);
2238
2239 /* Add in menu bar lines, if any. */
2240 matrix_dim.height += top_window_y;
2241
2242 /* Enlarge pools as necessary. */
2243 pool_changed_p = realloc_glyph_pool (f->desired_pool, matrix_dim);
2244 realloc_glyph_pool (f->current_pool, matrix_dim);
2245
177c0ea7 2246 /* Set up glyph pointers within window matrices. Do this only if
5f5c8ee5
GM
2247 absolutely necessary since it requires a frame redraw. */
2248 if (pool_changed_p || window_change_flags)
2249 {
2250 /* Do it for window matrices. */
2251 allocate_matrices_for_frame_redisplay (FRAME_ROOT_WINDOW (f),
5d3cc43c 2252 0, top_window_y, 0,
5f5c8ee5
GM
2253 &window_change_flags);
2254
2255 /* Size of frame matrices must equal size of frame. Note
2256 that we are called for X frames with window widths NOT equal
2257 to the frame width (from CHANGE_FRAME_SIZE_1). */
7df02016
KS
2258 xassert (matrix_dim.width == FRAME_COLS (f)
2259 && matrix_dim.height == FRAME_LINES (f));
177c0ea7 2260
e797dea6
GM
2261 /* Pointers to glyph memory in glyph rows are exchanged during
2262 the update phase of redisplay, which means in general that a
2263 frame's current matrix consists of pointers into both the
2264 desired and current glyph pool of the frame. Adjusting a
2265 matrix sets the frame matrix up so that pointers are all into
2266 the same pool. If we want to preserve glyph contents of the
2267 current matrix over a call to adjust_glyph_matrix, we must
2268 make a copy of the current glyphs, and restore the current
2269 matrix' contents from that copy. */
2270 if (display_completed
2271 && !FRAME_GARBAGED_P (f)
2272 && matrix_dim.width == f->current_matrix->matrix_w
075757cc
CY
2273 && matrix_dim.height == f->current_matrix->matrix_h
2274 /* For some reason, the frame glyph matrix gets corrupted if
2275 any of the windows contain margins. I haven't been able
2276 to hunt down the reason, but for the moment this prevents
2277 the problem from manifesting. -- cyd */
2278 && !showing_window_margins_p (XWINDOW (FRAME_ROOT_WINDOW (f))))
e797dea6 2279 {
bccee4f2
GM
2280 struct glyph_matrix *copy = save_current_matrix (f);
2281 adjust_glyph_matrix (NULL, f->desired_matrix, 0, 0, matrix_dim);
e797dea6 2282 adjust_glyph_matrix (NULL, f->current_matrix, 0, 0, matrix_dim);
bccee4f2 2283 restore_current_matrix (f, copy);
e797dea6
GM
2284 fake_current_matrices (FRAME_ROOT_WINDOW (f));
2285 }
c9f00270 2286 else
e797dea6 2287 {
bccee4f2 2288 adjust_glyph_matrix (NULL, f->desired_matrix, 0, 0, matrix_dim);
e797dea6
GM
2289 adjust_glyph_matrix (NULL, f->current_matrix, 0, 0, matrix_dim);
2290 SET_FRAME_GARBAGED (f);
2291 }
5f5c8ee5
GM
2292 }
2293}
2294
2295
2296/* Allocate/reallocate glyph matrices of a single frame F for
2297 window-based redisplay. */
2298
2299static void
971de7fb 2300adjust_frame_glyphs_for_window_redisplay (struct frame *f)
5f5c8ee5 2301{
5f5c8ee5
GM
2302 struct window *w;
2303
2304 xassert (FRAME_WINDOW_P (f) && FRAME_LIVE_P (f));
177c0ea7 2305
5f5c8ee5 2306 /* Allocate/reallocate window matrices. */
5d3cc43c 2307 allocate_matrices_for_window_redisplay (XWINDOW (FRAME_ROOT_WINDOW (f)));
5f5c8ee5 2308
8ce2650d 2309#ifdef HAVE_X_WINDOWS
5f5c8ee5
GM
2310 /* Allocate/ reallocate matrices of the dummy window used to display
2311 the menu bar under X when no X toolkit support is available. */
488dd4c4 2312#if ! defined (USE_X_TOOLKIT) && ! defined (USE_GTK)
5f5c8ee5
GM
2313 {
2314 /* Allocate a dummy window if not already done. */
2315 if (NILP (f->menu_bar_window))
2316 {
2317 f->menu_bar_window = make_window ();
2318 w = XWINDOW (f->menu_bar_window);
2319 XSETFRAME (w->frame, f);
2320 w->pseudo_window_p = 1;
2321 }
2322 else
2323 w = XWINDOW (f->menu_bar_window);
2324
2325 /* Set window dimensions to frame dimensions and allocate or
2326 adjust glyph matrices of W. */
7df02016
KS
2327 XSETFASTINT (w->top_line, 0);
2328 XSETFASTINT (w->left_col, 0);
2329 XSETFASTINT (w->total_lines, FRAME_MENU_BAR_LINES (f));
2330 XSETFASTINT (w->total_cols, FRAME_TOTAL_COLS (f));
5d3cc43c 2331 allocate_matrices_for_window_redisplay (w);
5f5c8ee5 2332 }
57714a86
YM
2333#endif /* not USE_X_TOOLKIT && not USE_GTK */
2334#endif /* HAVE_X_WINDOWS */
5f5c8ee5 2335
488dd4c4 2336#ifndef USE_GTK
9ea173e8
GM
2337 /* Allocate/ reallocate matrices of the tool bar window. If we
2338 don't have a tool bar window yet, make one. */
2339 if (NILP (f->tool_bar_window))
5f5c8ee5 2340 {
9ea173e8
GM
2341 f->tool_bar_window = make_window ();
2342 w = XWINDOW (f->tool_bar_window);
5f5c8ee5
GM
2343 XSETFRAME (w->frame, f);
2344 w->pseudo_window_p = 1;
2345 }
2346 else
9ea173e8 2347 w = XWINDOW (f->tool_bar_window);
5f5c8ee5 2348
7df02016
KS
2349 XSETFASTINT (w->top_line, FRAME_MENU_BAR_LINES (f));
2350 XSETFASTINT (w->left_col, 0);
2351 XSETFASTINT (w->total_lines, FRAME_TOOL_BAR_LINES (f));
2352 XSETFASTINT (w->total_cols, FRAME_TOTAL_COLS (f));
5d3cc43c 2353 allocate_matrices_for_window_redisplay (w);
488dd4c4 2354#endif
5f5c8ee5
GM
2355}
2356
2357
177c0ea7 2358/* Adjust/ allocate message buffer of frame F.
5f5c8ee5 2359
5f5c8ee5
GM
2360 Note that the message buffer is never freed. Since I could not
2361 find a free in 19.34, I assume that freeing it would be
2362 problematic in some way and don't do it either.
2363
2364 (Implementation note: It should be checked if we can free it
2365 eventually without causing trouble). */
2366
2367static void
971de7fb 2368adjust_frame_message_buffer (struct frame *f)
5f5c8ee5
GM
2369{
2370 int size = FRAME_MESSAGE_BUF_SIZE (f) + 1;
2371
2372 if (FRAME_MESSAGE_BUF (f))
2373 {
2374 char *buffer = FRAME_MESSAGE_BUF (f);
2375 char *new_buffer = (char *) xrealloc (buffer, size);
5f5c8ee5
GM
2376 FRAME_MESSAGE_BUF (f) = new_buffer;
2377 }
2378 else
2379 FRAME_MESSAGE_BUF (f) = (char *) xmalloc (size);
2380}
2381
2382
2383/* Re-allocate buffer for decode_mode_spec on frame F. */
2384
2385static void
971de7fb 2386adjust_decode_mode_spec_buffer (struct frame *f)
5f5c8ee5
GM
2387{
2388 f->decode_mode_spec_buffer
2389 = (char *) xrealloc (f->decode_mode_spec_buffer,
2390 FRAME_MESSAGE_BUF_SIZE (f) + 1);
2391}
2392
2393
2394\f
2395/**********************************************************************
2396 Freeing Glyph Matrices
2397 **********************************************************************/
2398
2399/* Free glyph memory for a frame F. F may be null. This function can
2400 be called for the same frame more than once. The root window of
2401 F may be nil when this function is called. This is the case when
2402 the function is called when F is destroyed. */
2403
2404void
971de7fb 2405free_glyphs (struct frame *f)
5f5c8ee5
GM
2406{
2407 if (f && f->glyphs_initialized_p)
2408 {
42f55fe0
GM
2409 /* Block interrupt input so that we don't get surprised by an X
2410 event while we're in an inconsistent state. */
2411 BLOCK_INPUT;
5f5c8ee5 2412 f->glyphs_initialized_p = 0;
177c0ea7 2413
5f5c8ee5
GM
2414 /* Release window sub-matrices. */
2415 if (!NILP (f->root_window))
2416 free_window_matrices (XWINDOW (f->root_window));
2417
2418 /* Free the dummy window for menu bars without X toolkit and its
2419 glyph matrices. */
2420 if (!NILP (f->menu_bar_window))
2421 {
2422 struct window *w = XWINDOW (f->menu_bar_window);
2423 free_glyph_matrix (w->desired_matrix);
2424 free_glyph_matrix (w->current_matrix);
2425 w->desired_matrix = w->current_matrix = NULL;
2426 f->menu_bar_window = Qnil;
2427 }
2428
9ea173e8
GM
2429 /* Free the tool bar window and its glyph matrices. */
2430 if (!NILP (f->tool_bar_window))
5f5c8ee5 2431 {
9ea173e8 2432 struct window *w = XWINDOW (f->tool_bar_window);
5f5c8ee5
GM
2433 free_glyph_matrix (w->desired_matrix);
2434 free_glyph_matrix (w->current_matrix);
2435 w->desired_matrix = w->current_matrix = NULL;
9ea173e8 2436 f->tool_bar_window = Qnil;
5f5c8ee5
GM
2437 }
2438
2439 /* Release frame glyph matrices. Reset fields to zero in
2440 case we are called a second time. */
2441 if (f->desired_matrix)
2442 {
2443 free_glyph_matrix (f->desired_matrix);
2444 free_glyph_matrix (f->current_matrix);
2445 f->desired_matrix = f->current_matrix = NULL;
2446 }
2447
2448 /* Release glyph pools. */
2449 if (f->desired_pool)
2450 {
2451 free_glyph_pool (f->desired_pool);
2452 free_glyph_pool (f->current_pool);
2453 f->desired_pool = f->current_pool = NULL;
2454 }
177c0ea7 2455
42f55fe0 2456 UNBLOCK_INPUT;
5f5c8ee5
GM
2457 }
2458}
2459
2460
2461/* Free glyph sub-matrices in the window tree rooted at W. This
2462 function may be called with a null pointer, and it may be called on
2463 the same tree more than once. */
2464
2465void
971de7fb 2466free_window_matrices (struct window *w)
5f5c8ee5
GM
2467{
2468 while (w)
2469 {
2470 if (!NILP (w->hchild))
2471 free_window_matrices (XWINDOW (w->hchild));
2472 else if (!NILP (w->vchild))
2473 free_window_matrices (XWINDOW (w->vchild));
177c0ea7 2474 else
5f5c8ee5
GM
2475 {
2476 /* This is a leaf window. Free its memory and reset fields
2477 to zero in case this function is called a second time for
2478 W. */
2479 free_glyph_matrix (w->current_matrix);
2480 free_glyph_matrix (w->desired_matrix);
2481 w->current_matrix = w->desired_matrix = NULL;
2482 }
2483
2484 /* Next window on same level. */
2485 w = NILP (w->next) ? 0 : XWINDOW (w->next);
2486 }
2487}
2488
2489
2490/* Check glyph memory leaks. This function is called from
2491 shut_down_emacs. Note that frames are not destroyed when Emacs
2492 exits. We therefore free all glyph memory for all active frames
2493 explicitly and check that nothing is left allocated. */
2494
2495void
971de7fb 2496check_glyph_memory (void)
5f5c8ee5
GM
2497{
2498 Lisp_Object tail, frame;
2499
2500 /* Free glyph memory for all frames. */
2501 FOR_EACH_FRAME (tail, frame)
2502 free_glyphs (XFRAME (frame));
2503
2504 /* Check that nothing is left allocated. */
2505 if (glyph_matrix_count)
2506 abort ();
2507 if (glyph_pool_count)
2508 abort ();
2509}
2510
2511
2512\f
2513/**********************************************************************
2514 Building a Frame Matrix
2515 **********************************************************************/
2516
2517/* Most of the redisplay code works on glyph matrices attached to
2518 windows. This is a good solution most of the time, but it is not
2519 suitable for terminal code. Terminal output functions cannot rely
2520 on being able to set an arbitrary terminal window. Instead they
2521 must be provided with a view of the whole frame, i.e. the whole
2522 screen. We build such a view by constructing a frame matrix from
2523 window matrices in this section.
2524
2525 Windows that must be updated have their must_be_update_p flag set.
2526 For all such windows, their desired matrix is made part of the
2527 desired frame matrix. For other windows, their current matrix is
2528 made part of the desired frame matrix.
2529
2530 +-----------------+----------------+
2531 | desired | desired |
2532 | | |
2533 +-----------------+----------------+
2534 | current |
2535 | |
2536 +----------------------------------+
2537
2538 Desired window matrices can be made part of the frame matrix in a
2539 cheap way: We exploit the fact that the desired frame matrix and
2540 desired window matrices share their glyph memory. This is not
2541 possible for current window matrices. Their glyphs are copied to
2542 the desired frame matrix. The latter is equivalent to
2543 preserve_other_columns in the old redisplay.
2544
2545 Used glyphs counters for frame matrix rows are the result of adding
2546 up glyph lengths of the window matrices. A line in the frame
2547 matrix is enabled, if a corresponding line in a window matrix is
2548 enabled.
177c0ea7 2549
5f5c8ee5
GM
2550 After building the desired frame matrix, it will be passed to
2551 terminal code, which will manipulate both the desired and current
2552 frame matrix. Changes applied to the frame's current matrix have
2553 to be visible in current window matrices afterwards, of course.
2554
2555 This problem is solved like this:
2556
2557 1. Window and frame matrices share glyphs. Window matrices are
2558 constructed in a way that their glyph contents ARE the glyph
2559 contents needed in a frame matrix. Thus, any modification of
2560 glyphs done in terminal code will be reflected in window matrices
2561 automatically.
177c0ea7 2562
5f5c8ee5
GM
2563 2. Exchanges of rows in a frame matrix done by terminal code are
2564 intercepted by hook functions so that corresponding row operations
2565 on window matrices can be performed. This is necessary because we
2566 use pointers to glyphs in glyph row structures. To satisfy the
2567 assumption of point 1 above that glyphs are updated implicitly in
2568 window matrices when they are manipulated via the frame matrix,
2569 window and frame matrix must of course agree where to find the
2570 glyphs for their rows. Possible manipulations that must be
2571 mirrored are assignments of rows of the desired frame matrix to the
2572 current frame matrix and scrolling the current frame matrix. */
2573
2574/* Build frame F's desired matrix from window matrices. Only windows
2575 which have the flag must_be_updated_p set have to be updated. Menu
2576 bar lines of a frame are not covered by window matrices, so make
2577 sure not to touch them in this function. */
2578
2579static void
971de7fb 2580build_frame_matrix (struct frame *f)
5f5c8ee5
GM
2581{
2582 int i;
2583
2584 /* F must have a frame matrix when this function is called. */
2585 xassert (!FRAME_WINDOW_P (f));
177c0ea7 2586
5f5c8ee5
GM
2587 /* Clear all rows in the frame matrix covered by window matrices.
2588 Menu bar lines are not covered by windows. */
2589 for (i = FRAME_TOP_MARGIN (f); i < f->desired_matrix->nrows; ++i)
2590 clear_glyph_row (MATRIX_ROW (f->desired_matrix, i));
2591
2592 /* Build the matrix by walking the window tree. */
2593 build_frame_matrix_from_window_tree (f->desired_matrix,
2594 XWINDOW (FRAME_ROOT_WINDOW (f)));
2595}
2596
2597
2598/* Walk a window tree, building a frame matrix MATRIX from window
2599 matrices. W is the root of a window tree. */
2600
2601static void
971de7fb 2602build_frame_matrix_from_window_tree (struct glyph_matrix *matrix, struct window *w)
5f5c8ee5
GM
2603{
2604 while (w)
2605 {
2606 if (!NILP (w->hchild))
2607 build_frame_matrix_from_window_tree (matrix, XWINDOW (w->hchild));
2608 else if (!NILP (w->vchild))
2609 build_frame_matrix_from_window_tree (matrix, XWINDOW (w->vchild));
2610 else
2611 build_frame_matrix_from_leaf_window (matrix, w);
2612
2613 w = NILP (w->next) ? 0 : XWINDOW (w->next);
2614 }
2615}
2616
2617
2618/* Add a window's matrix to a frame matrix. FRAME_MATRIX is the
2619 desired frame matrix built. W is a leaf window whose desired or
2620 current matrix is to be added to FRAME_MATRIX. W's flag
2621 must_be_updated_p determines which matrix it contributes to
2622 FRAME_MATRIX. If must_be_updated_p is non-zero, W's desired matrix
2623 is added to FRAME_MATRIX, otherwise W's current matrix is added.
2624 Adding a desired matrix means setting up used counters and such in
2625 frame rows, while adding a current window matrix to FRAME_MATRIX
2626 means copying glyphs. The latter case corresponds to
2627 preserve_other_columns in the old redisplay. */
2628
2629static void
971de7fb 2630build_frame_matrix_from_leaf_window (struct glyph_matrix *frame_matrix, struct window *w)
5f5c8ee5
GM
2631{
2632 struct glyph_matrix *window_matrix;
2633 int window_y, frame_y;
2634 /* If non-zero, a glyph to insert at the right border of W. */
3fc809e2
KS
2635 GLYPH right_border_glyph;
2636
2637 SET_GLYPH_FROM_CHAR (right_border_glyph, 0);
5f5c8ee5
GM
2638
2639 /* Set window_matrix to the matrix we have to add to FRAME_MATRIX. */
2640 if (w->must_be_updated_p)
2641 {
2642 window_matrix = w->desired_matrix;
2643
2644 /* Decide whether we want to add a vertical border glyph. */
2645 if (!WINDOW_RIGHTMOST_P (w))
2646 {
2647 struct Lisp_Char_Table *dp = window_display_table (w);
3fc809e2 2648 Lisp_Object gc;
b4e49aee 2649
3fc809e2
KS
2650 SET_GLYPH_FROM_CHAR (right_border_glyph, '|');
2651 if (dp
2652 && (gc = DISP_BORDER_GLYPH (dp), GLYPH_CODE_P (gc))
2653 && GLYPH_CODE_CHAR_VALID_P (gc))
2654 {
2655 SET_GLYPH_FROM_GLYPH_CODE (right_border_glyph, gc);
2656 spec_glyph_lookup_face (w, &right_border_glyph);
2657 }
b4e49aee 2658
3fc809e2
KS
2659 if (GLYPH_FACE (right_border_glyph) <= 0)
2660 SET_GLYPH_FACE (right_border_glyph, VERTICAL_BORDER_FACE_ID);
5f5c8ee5
GM
2661 }
2662 }
2663 else
2664 window_matrix = w->current_matrix;
2665
2666 /* For all rows in the window matrix and corresponding rows in the
2667 frame matrix. */
2668 window_y = 0;
2669 frame_y = window_matrix->matrix_y;
2670 while (window_y < window_matrix->nrows)
2671 {
2672 struct glyph_row *frame_row = frame_matrix->rows + frame_y;
2673 struct glyph_row *window_row = window_matrix->rows + window_y;
2a8bd25f 2674 int current_row_p = window_matrix == w->current_matrix;
5f5c8ee5
GM
2675
2676 /* Fill up the frame row with spaces up to the left margin of the
2677 window row. */
2678 fill_up_frame_row_with_spaces (frame_row, window_matrix->matrix_x);
2679
2680 /* Fill up areas in the window matrix row with spaces. */
2681 fill_up_glyph_row_with_spaces (window_row);
2a8bd25f
GM
2682
2683 /* If only part of W's desired matrix has been built, and
2684 window_row wasn't displayed, use the corresponding current
2685 row instead. */
2686 if (window_matrix == w->desired_matrix
2687 && !window_row->enabled_p)
2688 {
2689 window_row = w->current_matrix->rows + window_y;
2690 current_row_p = 1;
2691 }
177c0ea7 2692
2a8bd25f 2693 if (current_row_p)
5f5c8ee5 2694 {
2a8bd25f 2695 /* Copy window row to frame row. */
72af86bd
AS
2696 memcpy (frame_row->glyphs[TEXT_AREA] + window_matrix->matrix_x,
2697 window_row->glyphs[0],
2698 window_matrix->matrix_w * sizeof (struct glyph));
5f5c8ee5
GM
2699 }
2700 else
2701 {
2a8bd25f 2702 xassert (window_row->enabled_p);
177c0ea7 2703
2a8bd25f
GM
2704 /* Only when a desired row has been displayed, we want
2705 the corresponding frame row to be updated. */
2706 frame_row->enabled_p = 1;
177c0ea7 2707
5f5c8ee5
GM
2708 /* Maybe insert a vertical border between horizontally adjacent
2709 windows. */
3fc809e2 2710 if (GLYPH_CHAR (right_border_glyph) != 0)
5f5c8ee5
GM
2711 {
2712 struct glyph *border = window_row->glyphs[LAST_AREA] - 1;
2713 SET_CHAR_GLYPH_FROM_GLYPH (*border, right_border_glyph);
2714 }
2715
498c08ea 2716#if GLYPH_DEBUG
a13396c9
GM
2717 /* Window row window_y must be a slice of frame row
2718 frame_y. */
5f5c8ee5 2719 xassert (glyph_row_slice_p (window_row, frame_row));
177c0ea7 2720
5f5c8ee5
GM
2721 /* If rows are in sync, we don't have to copy glyphs because
2722 frame and window share glyphs. */
177c0ea7 2723
a38634ff 2724 strcpy (w->current_matrix->method, w->desired_matrix->method);
9b0e97aa 2725 add_window_display_history (w, w->current_matrix->method, 0);
a38634ff 2726#endif
5f5c8ee5
GM
2727 }
2728
2729 /* Set number of used glyphs in the frame matrix. Since we fill
2730 up with spaces, and visit leaf windows from left to right it
2731 can be done simply. */
177c0ea7 2732 frame_row->used[TEXT_AREA]
5f5c8ee5
GM
2733 = window_matrix->matrix_x + window_matrix->matrix_w;
2734
5f5c8ee5
GM
2735 /* Next row. */
2736 ++window_y;
2737 ++frame_y;
2738 }
2739}
2740
5f81871e
RS
2741/* Given a user-specified glyph, possibly including a Lisp-level face
2742 ID, return a glyph that has a realized face ID.
2743 This is used for glyphs displayed specially and not part of the text;
2744 for instance, vertical separators, truncation markers, etc. */
2745
3fc809e2 2746void
971de7fb 2747spec_glyph_lookup_face (struct window *w, GLYPH *glyph)
5f81871e 2748{
3fc809e2 2749 int lface_id = GLYPH_FACE (*glyph);
5f81871e
RS
2750 /* Convert the glyph's specified face to a realized (cache) face. */
2751 if (lface_id > 0)
2752 {
2753 int face_id = merge_faces (XFRAME (w->frame),
2754 Qt, lface_id, DEFAULT_FACE_ID);
3fc809e2 2755 SET_GLYPH_FACE (*glyph, face_id);
5f81871e 2756 }
5f81871e 2757}
5f5c8ee5
GM
2758
2759/* Add spaces to a glyph row ROW in a window matrix.
2760
2761 Each row has the form:
2762
2763 +---------+-----------------------------+------------+
2764 | left | text | right |
2765 +---------+-----------------------------+------------+
2766
2767 Left and right marginal areas are optional. This function adds
2768 spaces to areas so that there are no empty holes between areas.
2769 In other words: If the right area is not empty, the text area
2770 is filled up with spaces up to the right area. If the text area
2771 is not empty, the left area is filled up.
2772
2773 To be called for frame-based redisplay, only. */
2774
2775static void
971de7fb 2776fill_up_glyph_row_with_spaces (struct glyph_row *row)
5f5c8ee5
GM
2777{
2778 fill_up_glyph_row_area_with_spaces (row, LEFT_MARGIN_AREA);
2779 fill_up_glyph_row_area_with_spaces (row, TEXT_AREA);
2780 fill_up_glyph_row_area_with_spaces (row, RIGHT_MARGIN_AREA);
2781}
2782
2783
2784/* Fill area AREA of glyph row ROW with spaces. To be called for
2785 frame-based redisplay only. */
2786
2787static void
971de7fb 2788fill_up_glyph_row_area_with_spaces (struct glyph_row *row, int area)
5f5c8ee5
GM
2789{
2790 if (row->glyphs[area] < row->glyphs[area + 1])
2791 {
2792 struct glyph *end = row->glyphs[area + 1];
2793 struct glyph *text = row->glyphs[area] + row->used[area];
2794
2795 while (text < end)
2796 *text++ = space_glyph;
2797 row->used[area] = text - row->glyphs[area];
2798 }
2799}
2800
2801
2802/* Add spaces to the end of ROW in a frame matrix until index UPTO is
2803 reached. In frame matrices only one area, TEXT_AREA, is used. */
2804
2805static void
971de7fb 2806fill_up_frame_row_with_spaces (struct glyph_row *row, int upto)
5f5c8ee5
GM
2807{
2808 int i = row->used[TEXT_AREA];
2809 struct glyph *glyph = row->glyphs[TEXT_AREA];
177c0ea7 2810
5f5c8ee5
GM
2811 while (i < upto)
2812 glyph[i++] = space_glyph;
2813
2814 row->used[TEXT_AREA] = i;
2815}
2816
2817
2818\f
2819/**********************************************************************
2820 Mirroring operations on frame matrices in window matrices
2821 **********************************************************************/
2822
2823/* Set frame being updated via frame-based redisplay to F. This
2824 function must be called before updates to make explicit that we are
2825 working on frame matrices or not. */
2826
2827static INLINE void
971de7fb 2828set_frame_matrix_frame (struct frame *f)
5f5c8ee5
GM
2829{
2830 frame_matrix_frame = f;
2831}
2832
2833
2834/* Make sure glyph row ROW in CURRENT_MATRIX is up to date.
2835 DESIRED_MATRIX is the desired matrix corresponding to
2836 CURRENT_MATRIX. The update is done by exchanging glyph pointers
2837 between rows in CURRENT_MATRIX and DESIRED_MATRIX. If
2838 frame_matrix_frame is non-null, this indicates that the exchange is
2839 done in frame matrices, and that we have to perform analogous
2840 operations in window matrices of frame_matrix_frame. */
2841
2842static INLINE void
971de7fb 2843make_current (struct glyph_matrix *desired_matrix, struct glyph_matrix *current_matrix, int row)
5f5c8ee5
GM
2844{
2845 struct glyph_row *current_row = MATRIX_ROW (current_matrix, row);
2846 struct glyph_row *desired_row = MATRIX_ROW (desired_matrix, row);
e876ff42 2847 int mouse_face_p = current_row->mouse_face_p;
5f5c8ee5
GM
2848
2849 /* Do current_row = desired_row. This exchanges glyph pointers
2850 between both rows, and does a structure assignment otherwise. */
2851 assign_row (current_row, desired_row);
2852
2853 /* Enable current_row to mark it as valid. */
2854 current_row->enabled_p = 1;
e876ff42 2855 current_row->mouse_face_p = mouse_face_p;
5f5c8ee5
GM
2856
2857 /* If we are called on frame matrices, perform analogous operations
2858 for window matrices. */
2859 if (frame_matrix_frame)
2860 mirror_make_current (XWINDOW (frame_matrix_frame->root_window), row);
2861}
2862
2863
2864/* W is the root of a window tree. FRAME_ROW is the index of a row in
2865 W's frame which has been made current (by swapping pointers between
2866 current and desired matrix). Perform analogous operations in the
2867 matrices of leaf windows in the window tree rooted at W. */
2868
2869static void
971de7fb 2870mirror_make_current (struct window *w, int frame_row)
5f5c8ee5
GM
2871{
2872 while (w)
2873 {
2874 if (!NILP (w->hchild))
2875 mirror_make_current (XWINDOW (w->hchild), frame_row);
2876 else if (!NILP (w->vchild))
2877 mirror_make_current (XWINDOW (w->vchild), frame_row);
2878 else
2879 {
2880 /* Row relative to window W. Don't use FRAME_TO_WINDOW_VPOS
2881 here because the checks performed in debug mode there
2882 will not allow the conversion. */
2883 int row = frame_row - w->desired_matrix->matrix_y;
2884
2885 /* If FRAME_ROW is within W, assign the desired row to the
2886 current row (exchanging glyph pointers). */
2887 if (row >= 0 && row < w->desired_matrix->matrix_h)
2888 {
2889 struct glyph_row *current_row
2890 = MATRIX_ROW (w->current_matrix, row);
2891 struct glyph_row *desired_row
2892 = MATRIX_ROW (w->desired_matrix, row);
a38634ff
GM
2893
2894 if (desired_row->enabled_p)
2895 assign_row (current_row, desired_row);
2896 else
2897 swap_glyph_pointers (desired_row, current_row);
5f5c8ee5
GM
2898 current_row->enabled_p = 1;
2899 }
2900 }
177c0ea7 2901
5f5c8ee5
GM
2902 w = NILP (w->next) ? 0 : XWINDOW (w->next);
2903 }
2904}
2905
2906
2907/* Perform row dance after scrolling. We are working on the range of
2908 lines UNCHANGED_AT_TOP + 1 to UNCHANGED_AT_TOP + NLINES (not
2909 including) in MATRIX. COPY_FROM is a vector containing, for each
2910 row I in the range 0 <= I < NLINES, the index of the original line
2911 to move to I. This index is relative to the row range, i.e. 0 <=
2912 index < NLINES. RETAINED_P is a vector containing zero for each
2913 row 0 <= I < NLINES which is empty.
2914
2915 This function is called from do_scrolling and do_direct_scrolling. */
177c0ea7 2916
5f5c8ee5
GM
2917void
2918mirrored_line_dance (matrix, unchanged_at_top, nlines, copy_from,
2919 retained_p)
2920 struct glyph_matrix *matrix;
2921 int unchanged_at_top, nlines;
2922 int *copy_from;
2923 char *retained_p;
2924{
2925 /* A copy of original rows. */
2926 struct glyph_row *old_rows;
2927
2928 /* Rows to assign to. */
2929 struct glyph_row *new_rows = MATRIX_ROW (matrix, unchanged_at_top);
177c0ea7 2930
5f5c8ee5
GM
2931 int i;
2932
2933 /* Make a copy of the original rows. */
2934 old_rows = (struct glyph_row *) alloca (nlines * sizeof *old_rows);
72af86bd 2935 memcpy (old_rows, new_rows, nlines * sizeof *old_rows);
5f5c8ee5
GM
2936
2937 /* Assign new rows, maybe clear lines. */
2938 for (i = 0; i < nlines; ++i)
2939 {
2940 int enabled_before_p = new_rows[i].enabled_p;
2941
2942 xassert (i + unchanged_at_top < matrix->nrows);
2943 xassert (unchanged_at_top + copy_from[i] < matrix->nrows);
2944 new_rows[i] = old_rows[copy_from[i]];
2945 new_rows[i].enabled_p = enabled_before_p;
2946
2947 /* RETAINED_P is zero for empty lines. */
2948 if (!retained_p[copy_from[i]])
2949 new_rows[i].enabled_p = 0;
2950 }
2951
153a073c 2952 /* Do the same for window matrices, if MATRIX is a frame matrix. */
5f5c8ee5
GM
2953 if (frame_matrix_frame)
2954 mirror_line_dance (XWINDOW (frame_matrix_frame->root_window),
2955 unchanged_at_top, nlines, copy_from, retained_p);
2956}
2957
2958
a13396c9 2959/* Synchronize glyph pointers in the current matrix of window W with
5cb88111 2960 the current frame matrix. */
a13396c9
GM
2961
2962static void
971de7fb 2963sync_window_with_frame_matrix_rows (struct window *w)
a13396c9
GM
2964{
2965 struct frame *f = XFRAME (w->frame);
2966 struct glyph_row *window_row, *window_row_end, *frame_row;
075c507b 2967 int left, right, x, width;
a13396c9 2968
5cb88111 2969 /* Preconditions: W must be a leaf window on a tty frame. */
a13396c9 2970 xassert (NILP (w->hchild) && NILP (w->vchild));
a13396c9
GM
2971 xassert (!FRAME_WINDOW_P (f));
2972
7df02016
KS
2973 left = margin_glyphs_to_reserve (w, 1, w->left_margin_cols);
2974 right = margin_glyphs_to_reserve (w, 1, w->right_margin_cols);
5cb88111
GM
2975 x = w->current_matrix->matrix_x;
2976 width = w->current_matrix->matrix_w;
2977
a13396c9
GM
2978 window_row = w->current_matrix->rows;
2979 window_row_end = window_row + w->current_matrix->nrows;
7df02016 2980 frame_row = f->current_matrix->rows + WINDOW_TOP_EDGE_LINE (w);
177c0ea7 2981
5cb88111 2982 for (; window_row < window_row_end; ++window_row, ++frame_row)
a13396c9 2983 {
5cb88111
GM
2984 window_row->glyphs[LEFT_MARGIN_AREA]
2985 = frame_row->glyphs[0] + x;
2986 window_row->glyphs[TEXT_AREA]
2987 = window_row->glyphs[LEFT_MARGIN_AREA] + left;
2988 window_row->glyphs[LAST_AREA]
2989 = window_row->glyphs[LEFT_MARGIN_AREA] + width;
2990 window_row->glyphs[RIGHT_MARGIN_AREA]
2991 = window_row->glyphs[LAST_AREA] - right;
a13396c9
GM
2992 }
2993}
2994
2995
2996/* Return the window in the window tree rooted in W containing frame
2997 row ROW. Value is null if none is found. */
2998
2999struct window *
971de7fb 3000frame_row_to_window (struct window *w, int row)
a13396c9
GM
3001{
3002 struct window *found = NULL;
177c0ea7 3003
a13396c9
GM
3004 while (w && !found)
3005 {
3006 if (!NILP (w->hchild))
3007 found = frame_row_to_window (XWINDOW (w->hchild), row);
3008 else if (!NILP (w->vchild))
3009 found = frame_row_to_window (XWINDOW (w->vchild), row);
7df02016
KS
3010 else if (row >= WINDOW_TOP_EDGE_LINE (w)
3011 && row < WINDOW_BOTTOM_EDGE_LINE (w))
a13396c9 3012 found = w;
177c0ea7 3013
a13396c9
GM
3014 w = NILP (w->next) ? 0 : XWINDOW (w->next);
3015 }
3016
3017 return found;
3018}
3019
3020
5f5c8ee5
GM
3021/* Perform a line dance in the window tree rooted at W, after
3022 scrolling a frame matrix in mirrored_line_dance.
3023
3024 We are working on the range of lines UNCHANGED_AT_TOP + 1 to
3025 UNCHANGED_AT_TOP + NLINES (not including) in W's frame matrix.
3026 COPY_FROM is a vector containing, for each row I in the range 0 <=
3027 I < NLINES, the index of the original line to move to I. This
3028 index is relative to the row range, i.e. 0 <= index < NLINES.
3029 RETAINED_P is a vector containing zero for each row 0 <= I < NLINES
3030 which is empty. */
3031
3032static void
971de7fb 3033mirror_line_dance (struct window *w, int unchanged_at_top, int nlines, int *copy_from, char *retained_p)
5f5c8ee5
GM
3034{
3035 while (w)
3036 {
3037 if (!NILP (w->hchild))
3038 mirror_line_dance (XWINDOW (w->hchild), unchanged_at_top,
3039 nlines, copy_from, retained_p);
3040 else if (!NILP (w->vchild))
3041 mirror_line_dance (XWINDOW (w->vchild), unchanged_at_top,
3042 nlines, copy_from, retained_p);
3043 else
3044 {
3045 /* W is a leaf window, and we are working on its current
3046 matrix m. */
3047 struct glyph_matrix *m = w->current_matrix;
a13396c9 3048 int i, sync_p = 0;
5f5c8ee5
GM
3049 struct glyph_row *old_rows;
3050
3051 /* Make a copy of the original rows of matrix m. */
3052 old_rows = (struct glyph_row *) alloca (m->nrows * sizeof *old_rows);
72af86bd 3053 memcpy (old_rows, m->rows, m->nrows * sizeof *old_rows);
5f5c8ee5
GM
3054
3055 for (i = 0; i < nlines; ++i)
3056 {
3057 /* Frame relative line assigned to. */
3058 int frame_to = i + unchanged_at_top;
177c0ea7 3059
5f5c8ee5
GM
3060 /* Frame relative line assigned. */
3061 int frame_from = copy_from[i] + unchanged_at_top;
177c0ea7 3062
5f5c8ee5
GM
3063 /* Window relative line assigned to. */
3064 int window_to = frame_to - m->matrix_y;
177c0ea7 3065
5f5c8ee5
GM
3066 /* Window relative line assigned. */
3067 int window_from = frame_from - m->matrix_y;
177c0ea7 3068
5f5c8ee5
GM
3069 /* Is assigned line inside window? */
3070 int from_inside_window_p
3071 = window_from >= 0 && window_from < m->matrix_h;
177c0ea7 3072
a13396c9
GM
3073 /* Is assigned to line inside window? */
3074 int to_inside_window_p
3075 = window_to >= 0 && window_to < m->matrix_h;
177c0ea7 3076
a13396c9 3077 if (from_inside_window_p && to_inside_window_p)
5f5c8ee5 3078 {
5f5c8ee5
GM
3079 /* Enabled setting before assignment. */
3080 int enabled_before_p;
177c0ea7 3081
5f5c8ee5
GM
3082 /* Do the assignment. The enabled_p flag is saved
3083 over the assignment because the old redisplay did
3084 that. */
3085 enabled_before_p = m->rows[window_to].enabled_p;
3086 m->rows[window_to] = old_rows[window_from];
3087 m->rows[window_to].enabled_p = enabled_before_p;
177c0ea7 3088
5f5c8ee5
GM
3089 /* If frame line is empty, window line is empty, too. */
3090 if (!retained_p[copy_from[i]])
3091 m->rows[window_to].enabled_p = 0;
3092 }
a13396c9
GM
3093 else if (to_inside_window_p)
3094 {
3095 /* A copy between windows. This is an infrequent
3096 case not worth optimizing. */
3097 struct frame *f = XFRAME (w->frame);
3098 struct window *root = XWINDOW (FRAME_ROOT_WINDOW (f));
3099 struct window *w2;
3100 struct glyph_matrix *m2;
3101 int m2_from;
3102
fe8b8401 3103 w2 = frame_row_to_window (root, frame_from);
6183d842
RS
3104 /* ttn@surf.glug.org: when enabling menu bar using `emacs
3105 -nw', FROM_FRAME sometimes has no associated window.
3106 This check avoids a segfault if W2 is null. */
3107 if (w2)
3108 {
3109 m2 = w2->current_matrix;
3110 m2_from = frame_from - m2->matrix_y;
3111 copy_row_except_pointers (m->rows + window_to,
3112 m2->rows + m2_from);
3113
3114 /* If frame line is empty, window line is empty, too. */
3115 if (!retained_p[copy_from[i]])
3116 m->rows[window_to].enabled_p = 0;
3117 }
a13396c9
GM
3118 sync_p = 1;
3119 }
3120 else if (from_inside_window_p)
3121 sync_p = 1;
5f5c8ee5 3122 }
a13396c9
GM
3123
3124 /* If there was a copy between windows, make sure glyph
3125 pointers are in sync with the frame matrix. */
3126 if (sync_p)
3127 sync_window_with_frame_matrix_rows (w);
177c0ea7 3128
5f5c8ee5
GM
3129 /* Check that no pointers are lost. */
3130 CHECK_MATRIX (m);
3131 }
3132
3133 /* Next window on same level. */
3134 w = NILP (w->next) ? 0 : XWINDOW (w->next);
3135 }
3136}
3137
3138
3139#if GLYPH_DEBUG
3140
3141/* Check that window and frame matrices agree about their
3142 understanding where glyphs of the rows are to find. For each
3143 window in the window tree rooted at W, check that rows in the
3144 matrices of leaf window agree with their frame matrices about
3145 glyph pointers. */
3146
3147void
3148check_window_matrix_pointers (w)
3149 struct window *w;
3150{
3151 while (w)
3152 {
3153 if (!NILP (w->hchild))
3154 check_window_matrix_pointers (XWINDOW (w->hchild));
3155 else if (!NILP (w->vchild))
3156 check_window_matrix_pointers (XWINDOW (w->vchild));
3157 else
60a8948a 3158 {
5f5c8ee5
GM
3159 struct frame *f = XFRAME (w->frame);
3160 check_matrix_pointers (w->desired_matrix, f->desired_matrix);
3161 check_matrix_pointers (w->current_matrix, f->current_matrix);
60a8948a 3162 }
177c0ea7 3163
5f5c8ee5
GM
3164 w = NILP (w->next) ? 0 : XWINDOW (w->next);
3165 }
3166}
3167
3168
3169/* Check that window rows are slices of frame rows. WINDOW_MATRIX is
3170 a window and FRAME_MATRIX is the corresponding frame matrix. For
3171 each row in WINDOW_MATRIX check that it's a slice of the
3172 corresponding frame row. If it isn't, abort. */
3173
3174static void
3175check_matrix_pointers (window_matrix, frame_matrix)
3176 struct glyph_matrix *window_matrix, *frame_matrix;
3177{
3178 /* Row number in WINDOW_MATRIX. */
3179 int i = 0;
3180
3181 /* Row number corresponding to I in FRAME_MATRIX. */
3182 int j = window_matrix->matrix_y;
3183
177c0ea7 3184 /* For all rows check that the row in the window matrix is a
5f5c8ee5
GM
3185 slice of the row in the frame matrix. If it isn't we didn't
3186 mirror an operation on the frame matrix correctly. */
3187 while (i < window_matrix->nrows)
3188 {
3189 if (!glyph_row_slice_p (window_matrix->rows + i,
3190 frame_matrix->rows + j))
3191 abort ();
3192 ++i, ++j;
3193 }
3194}
3195
3196#endif /* GLYPH_DEBUG != 0 */
3197
3198
3199\f
3200/**********************************************************************
3201 VPOS and HPOS translations
3202 **********************************************************************/
3203
3204#if GLYPH_DEBUG
3205
3206/* Translate vertical position VPOS which is relative to window W to a
3207 vertical position relative to W's frame. */
3208
3209static int
3210window_to_frame_vpos (w, vpos)
3211 struct window *w;
3212 int vpos;
3213{
3214 struct frame *f = XFRAME (w->frame);
177c0ea7 3215
5f5c8ee5
GM
3216 xassert (!FRAME_WINDOW_P (f));
3217 xassert (vpos >= 0 && vpos <= w->desired_matrix->nrows);
7df02016
KS
3218 vpos += WINDOW_TOP_EDGE_LINE (w);
3219 xassert (vpos >= 0 && vpos <= FRAME_LINES (f));
5f5c8ee5
GM
3220 return vpos;
3221}
3222
3223
3224/* Translate horizontal position HPOS which is relative to window W to
153a073c 3225 a horizontal position relative to W's frame. */
5f5c8ee5
GM
3226
3227static int
3228window_to_frame_hpos (w, hpos)
3229 struct window *w;
3230 int hpos;
3231{
82f4a138 3232 xassert (!FRAME_WINDOW_P (XFRAME (w->frame)));
7df02016 3233 hpos += WINDOW_LEFT_EDGE_COL (w);
5f5c8ee5
GM
3234 return hpos;
3235}
177c0ea7 3236
5f5c8ee5
GM
3237#endif /* GLYPH_DEBUG */
3238
3239
3240\f
3241/**********************************************************************
3242 Redrawing Frames
3243 **********************************************************************/
3244
3245DEFUN ("redraw-frame", Fredraw_frame, Sredraw_frame, 1, 1, 0,
7ee72033 3246 doc: /* Clear frame FRAME and output again what is supposed to appear on it. */)
5842a27b 3247 (Lisp_Object frame)
5f5c8ee5
GM
3248{
3249 struct frame *f;
3250
b7826503 3251 CHECK_LIVE_FRAME (frame);
5f5c8ee5
GM
3252 f = XFRAME (frame);
3253
3254 /* Ignore redraw requests, if frame has no glyphs yet.
3255 (Implementation note: It still has to be checked why we are
3256 called so early here). */
3257 if (!glyphs_initialized_initially_p)
3258 return Qnil;
3259
3260 update_begin (f);
3224dac1 3261#ifdef MSDOS
f2adda5e 3262 if (FRAME_MSDOS_P (f))
79d39b69 3263 FRAME_TERMINAL (f)->set_terminal_modes_hook (FRAME_TERMINAL (f));
3224dac1 3264#endif
385ed61f 3265 clear_frame (f);
5f5c8ee5
GM
3266 clear_current_matrices (f);
3267 update_end (f);
daf01701 3268 if (FRAME_TERMCAP_P (f))
0b0d3e0b 3269 fflush (FRAME_TTY (f)->output);
5f5c8ee5
GM
3270 windows_or_buffers_changed++;
3271 /* Mark all windows as inaccurate, so that every window will have
3272 its redisplay done. */
3273 mark_window_display_accurate (FRAME_ROOT_WINDOW (f), 0);
3274 set_window_update_flags (XWINDOW (FRAME_ROOT_WINDOW (f)), 1);
3275 f->garbaged = 0;
3276 return Qnil;
3277}
3278
3279
3280/* Redraw frame F. This is nothing more than a call to the Lisp
3281 function redraw-frame. */
3282
3283void
971de7fb 3284redraw_frame (struct frame *f)
5f5c8ee5
GM
3285{
3286 Lisp_Object frame;
3287 XSETFRAME (frame, f);
3288 Fredraw_frame (frame);
3289}
3290
3291
3292DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "",
7ee72033 3293 doc: /* Clear and redisplay all visible frames. */)
5842a27b 3294 (void)
5f5c8ee5
GM
3295{
3296 Lisp_Object tail, frame;
3297
3298 FOR_EACH_FRAME (tail, frame)
3299 if (FRAME_VISIBLE_P (XFRAME (frame)))
3300 Fredraw_frame (frame);
3301
3302 return Qnil;
3303}
3304
3305
3306/* This is used when frame_garbaged is set. Call Fredraw_frame on all
3307 visible frames marked as garbaged. */
3308
3309void
971de7fb 3310redraw_garbaged_frames (void)
5f5c8ee5
GM
3311{
3312 Lisp_Object tail, frame;
3313
3314 FOR_EACH_FRAME (tail, frame)
3315 if (FRAME_VISIBLE_P (XFRAME (frame))
3316 && FRAME_GARBAGED_P (XFRAME (frame)))
3317 Fredraw_frame (frame);
3318}
3319
3320
3321\f
5f5c8ee5
GM
3322/***********************************************************************
3323 Frame Update
3324 ***********************************************************************/
4588ec20 3325
5f5c8ee5 3326/* Update frame F based on the data in desired matrices.
4588ec20 3327
5f5c8ee5
GM
3328 If FORCE_P is non-zero, don't let redisplay be stopped by detecting
3329 pending input. If INHIBIT_HAIRY_ID_P is non-zero, don't try
3330 scrolling.
177c0ea7 3331
5f5c8ee5 3332 Value is non-zero if redisplay was stopped due to pending input. */
4588ec20 3333
5f5c8ee5 3334int
971de7fb 3335update_frame (struct frame *f, int force_p, int inhibit_hairy_id_p)
5f5c8ee5
GM
3336{
3337 /* 1 means display has been paused because of pending input. */
3338 int paused_p;
3339 struct window *root_window = XWINDOW (f->root_window);
3340
a2130dbb
KS
3341 if (redisplay_dont_pause)
3342 force_p = 1;
d012c62b 3343#if PERIODIC_PREEMPTION_CHECKING
a2130dbb
KS
3344 else if (NILP (Vredisplay_preemption_period))
3345 force_p = 1;
3346 else if (!force_p && NUMBERP (Vredisplay_preemption_period))
d012c62b
KS
3347 {
3348 EMACS_TIME tm;
3349 double p = XFLOATINT (Vredisplay_preemption_period);
3350 int sec, usec;
3351
993d4ab6
KS
3352 if (detect_input_pending_ignore_squeezables ())
3353 {
3354 paused_p = 1;
3355 goto do_pause;
3356 }
3357
d012c62b
KS
3358 sec = (int) p;
3359 usec = (p - sec) * 1000000;
3360
3361 EMACS_GET_TIME (tm);
3362 EMACS_SET_SECS_USECS (preemption_period, sec, usec);
3363 EMACS_ADD_TIME (preemption_next_check, tm, preemption_period);
3364 }
3365#endif
3366
5f5c8ee5 3367 if (FRAME_WINDOW_P (f))
4588ec20 3368 {
5f5c8ee5
GM
3369 /* We are working on window matrix basis. All windows whose
3370 flag must_be_updated_p is set have to be updated. */
3371
3372 /* Record that we are not working on frame matrices. */
3373 set_frame_matrix_frame (NULL);
3374
3375 /* Update all windows in the window tree of F, maybe stopping
3376 when pending input is detected. */
3377 update_begin (f);
3378
3379 /* Update the menu bar on X frames that don't have toolkit
3380 support. */
3381 if (WINDOWP (f->menu_bar_window))
3382 update_window (XWINDOW (f->menu_bar_window), 1);
3383
3384 /* Update the tool-bar window, if present. */
9ea173e8 3385 if (WINDOWP (f->tool_bar_window))
4588ec20 3386 {
9ea173e8 3387 struct window *w = XWINDOW (f->tool_bar_window);
5f5c8ee5
GM
3388
3389 /* Update tool-bar window. */
3390 if (w->must_be_updated_p)
4588ec20 3391 {
153a073c
PJ
3392 Lisp_Object tem;
3393
5f5c8ee5
GM
3394 update_window (w, 1);
3395 w->must_be_updated_p = 0;
3396
3397 /* Swap tool-bar strings. We swap because we want to
3398 reuse strings. */
9ea173e8
GM
3399 tem = f->current_tool_bar_string;
3400 f->current_tool_bar_string = f->desired_tool_bar_string;
3401 f->desired_tool_bar_string = tem;
4588ec20
JB
3402 }
3403 }
177c0ea7 3404
5f5c8ee5
GM
3405
3406 /* Update windows. */
3407 paused_p = update_window_tree (root_window, force_p);
3408 update_end (f);
177c0ea7 3409
6b61353c 3410 /* This flush is a performance bottleneck under X,
e581a466 3411 and it doesn't seem to be necessary anyway (in general).
6b61353c 3412 It is necessary when resizing the window with the mouse, or
e581a466 3413 at least the fringes are not redrawn in a timely manner. ++kfs */
6b61353c 3414 if (f->force_flush_display_p)
e581a466
KL
3415 {
3416 FRAME_RIF (f)->flush_display (f);
3417 f->force_flush_display_p = 0;
3418 }
4588ec20 3419 }
5f5c8ee5
GM
3420 else
3421 {
3422 /* We are working on frame matrix basis. Set the frame on whose
3423 frame matrix we operate. */
3424 set_frame_matrix_frame (f);
3425
868dd24b 3426 /* Build F's desired matrix from window matrices. */
5f5c8ee5 3427 build_frame_matrix (f);
177c0ea7 3428
868dd24b
GM
3429 /* Update the display */
3430 update_begin (f);
5f5c8ee5 3431 paused_p = update_frame_1 (f, force_p, inhibit_hairy_id_p);
868dd24b
GM
3432 update_end (f);
3433
7d2f1216 3434 if (FRAME_TERMCAP_P (f) || FRAME_MSDOS_P (f))
3224dac1 3435 {
0b0d3e0b
KL
3436 if (FRAME_TTY (f)->termscript)
3437 fflush (FRAME_TTY (f)->termscript);
7d2f1216
EZ
3438 if (FRAME_TERMCAP_P (f))
3439 fflush (FRAME_TTY (f)->output);
3224dac1 3440 }
868dd24b 3441
5f5c8ee5 3442 /* Check window matrices for lost pointers. */
2d5912c1 3443#if GLYPH_DEBUG
9b0e97aa
GM
3444 check_window_matrix_pointers (root_window);
3445 add_frame_display_history (f, paused_p);
3446#endif
5f5c8ee5
GM
3447 }
3448
993d4ab6 3449 do_pause:
5f5c8ee5
GM
3450 /* Reset flags indicating that a window should be updated. */
3451 set_window_update_flags (root_window, 0);
177c0ea7 3452
868dd24b 3453 display_completed = !paused_p;
5f5c8ee5 3454 return paused_p;
4588ec20 3455}
5f5c8ee5
GM
3456
3457
4588ec20 3458\f
5f5c8ee5
GM
3459/************************************************************************
3460 Window-based updates
3461 ************************************************************************/
3462
3463/* Perform updates in window tree rooted at W. FORCE_P non-zero means
3464 don't stop updating when input is pending. */
3465
3466static int
971de7fb 3467update_window_tree (struct window *w, int force_p)
5f5c8ee5
GM
3468{
3469 int paused_p = 0;
177c0ea7 3470
5f5c8ee5
GM
3471 while (w && !paused_p)
3472 {
3473 if (!NILP (w->hchild))
3474 paused_p |= update_window_tree (XWINDOW (w->hchild), force_p);
3475 else if (!NILP (w->vchild))
3476 paused_p |= update_window_tree (XWINDOW (w->vchild), force_p);
3477 else if (w->must_be_updated_p)
3478 paused_p |= update_window (w, force_p);
3479
3480 w = NILP (w->next) ? 0 : XWINDOW (w->next);
3481 }
3482
3483 return paused_p;
3484}
3485
3486
3487/* Update window W if its flag must_be_updated_p is non-zero. If
3488 FORCE_P is non-zero, don't stop updating if input is pending. */
3489
3490void
971de7fb 3491update_single_window (struct window *w, int force_p)
5f5c8ee5
GM
3492{
3493 if (w->must_be_updated_p)
3494 {
3495 struct frame *f = XFRAME (WINDOW_FRAME (w));
3496
3497 /* Record that this is not a frame-based redisplay. */
3498 set_frame_matrix_frame (NULL);
3499
a2130dbb
KS
3500 if (redisplay_dont_pause)
3501 force_p = 1;
d012c62b 3502#if PERIODIC_PREEMPTION_CHECKING
a2130dbb
KS
3503 else if (NILP (Vredisplay_preemption_period))
3504 force_p = 1;
3505 else if (!force_p && NUMBERP (Vredisplay_preemption_period))
d012c62b
KS
3506 {
3507 EMACS_TIME tm;
3508 double p = XFLOATINT (Vredisplay_preemption_period);
3509 int sec, usec;
3510
3511 sec = (int) p;
3512 usec = (p - sec) * 1000000;
3513
3514 EMACS_GET_TIME (tm);
3515 EMACS_SET_SECS_USECS (preemption_period, sec, usec);
3516 EMACS_ADD_TIME (preemption_next_check, tm, preemption_period);
3517 }
3518#endif
3519
5f5c8ee5
GM
3520 /* Update W. */
3521 update_begin (f);
3522 update_window (w, force_p);
3523 update_end (f);
4588ec20 3524
5f5c8ee5
GM
3525 /* Reset flag in W. */
3526 w->must_be_updated_p = 0;
3527 }
3528}
4588ec20 3529
93e023fc 3530#ifdef HAVE_WINDOW_SYSTEM
4588ec20 3531
408f5064
GM
3532/* Redraw lines from the current matrix of window W that are
3533 overlapped by other rows. YB is bottom-most y-position in W. */
3534
3535static void
971de7fb 3536redraw_overlapped_rows (struct window *w, int yb)
408f5064 3537{
d8ee7803 3538 int i;
fa971ac3 3539 struct frame *f = XFRAME (WINDOW_FRAME (w));
3fc809e2 3540
408f5064
GM
3541 /* If rows overlapping others have been changed, the rows being
3542 overlapped have to be redrawn. This won't draw lines that have
3543 already been drawn in update_window_line because overlapped_p in
3544 desired rows is 0, so after row assignment overlapped_p in
3545 current rows is 0. */
3546 for (i = 0; i < w->current_matrix->nrows; ++i)
3547 {
e876ff42 3548 struct glyph_row *row = w->current_matrix->rows + i;
408f5064
GM
3549
3550 if (!row->enabled_p)
3551 break;
3552 else if (row->mode_line_p)
3553 continue;
177c0ea7 3554
408f5064
GM
3555 if (row->overlapped_p)
3556 {
3557 enum glyph_row_area area;
177c0ea7 3558
408f5064
GM
3559 for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area)
3560 {
3561 updated_row = row;
3562 updated_area = area;
fa971ac3
KL
3563 FRAME_RIF (f)->cursor_to (i, 0, row->y,
3564 area == TEXT_AREA ? row->x : 0);
408f5064 3565 if (row->used[area])
fa971ac3
KL
3566 FRAME_RIF (f)->write_glyphs (row->glyphs[area],
3567 row->used[area]);
3568 FRAME_RIF (f)->clear_end_of_line (-1);
408f5064 3569 }
177c0ea7 3570
408f5064
GM
3571 row->overlapped_p = 0;
3572 }
3573
e876ff42 3574 if (MATRIX_ROW_BOTTOM_Y (row) >= yb)
408f5064
GM
3575 break;
3576 }
3577}
3578
3579
3580/* Redraw lines from the current matrix of window W that overlap
3581 others. YB is bottom-most y-position in W. */
3582
3583static void
971de7fb 3584redraw_overlapping_rows (struct window *w, int yb)
408f5064
GM
3585{
3586 int i, bottom_y;
3587 struct glyph_row *row;
fa971ac3 3588 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
3fc809e2 3589
408f5064
GM
3590 for (i = 0; i < w->current_matrix->nrows; ++i)
3591 {
3592 row = w->current_matrix->rows + i;
3593
3594 if (!row->enabled_p)
3595 break;
3596 else if (row->mode_line_p)
3597 continue;
177c0ea7 3598
408f5064
GM
3599 bottom_y = MATRIX_ROW_BOTTOM_Y (row);
3600
b4b2c2ca 3601 if (row->overlapping_p)
408f5064 3602 {
41124e06
YM
3603 int overlaps = 0;
3604
b4b2c2ca 3605 if (MATRIX_ROW_OVERLAPS_PRED_P (row) && i > 0
41124e06
YM
3606 && !MATRIX_ROW (w->current_matrix, i - 1)->overlapped_p)
3607 overlaps |= OVERLAPS_PRED;
b4b2c2ca 3608 if (MATRIX_ROW_OVERLAPS_SUCC_P (row) && bottom_y < yb
41124e06
YM
3609 && !MATRIX_ROW (w->current_matrix, i + 1)->overlapped_p)
3610 overlaps |= OVERLAPS_SUCC;
3611
3612 if (overlaps)
3613 {
3614 if (row->used[LEFT_MARGIN_AREA])
3615 rif->fix_overlapping_area (w, row, LEFT_MARGIN_AREA, overlaps);
3616
3617 if (row->used[TEXT_AREA])
3618 rif->fix_overlapping_area (w, row, TEXT_AREA, overlaps);
3619
3620 if (row->used[RIGHT_MARGIN_AREA])
3621 rif->fix_overlapping_area (w, row, RIGHT_MARGIN_AREA, overlaps);
3622
3623 /* Record in neighbour rows that ROW overwrites part of
3624 their display. */
3625 if (overlaps & OVERLAPS_PRED)
3626 MATRIX_ROW (w->current_matrix, i - 1)->overlapped_p = 1;
3627 if (overlaps & OVERLAPS_SUCC)
3628 MATRIX_ROW (w->current_matrix, i + 1)->overlapped_p = 1;
3629 }
408f5064
GM
3630 }
3631
3632 if (bottom_y >= yb)
3633 break;
3634 }
3635}
3636
93e023fc
KS
3637#endif /* HAVE_WINDOW_SYSTEM */
3638
408f5064 3639
93962bfa
GM
3640#ifdef GLYPH_DEBUG
3641
3642/* Check that no row in the current matrix of window W is enabled
3643 which is below what's displayed in the window. */
3644
3645void
971de7fb 3646check_current_matrix_flags (struct window *w)
93962bfa
GM
3647{
3648 int last_seen_p = 0;
3649 int i, yb = window_text_bottom_y (w);
3650
3651 for (i = 0; i < w->current_matrix->nrows - 1; ++i)
3652 {
3653 struct glyph_row *row = MATRIX_ROW (w->current_matrix, i);
3654 if (!last_seen_p && MATRIX_ROW_BOTTOM_Y (row) >= yb)
3655 last_seen_p = 1;
3656 else if (last_seen_p && row->enabled_p)
3657 abort ();
3658 }
3659}
3660
3661#endif /* GLYPH_DEBUG */
3662
3663
5f5c8ee5
GM
3664/* Update display of window W. FORCE_P non-zero means that we should
3665 not stop when detecting pending input. */
3666
3667static int
971de7fb 3668update_window (struct window *w, int force_p)
4588ec20 3669{
5f5c8ee5
GM
3670 struct glyph_matrix *desired_matrix = w->desired_matrix;
3671 int paused_p;
d012c62b 3672#if !PERIODIC_PREEMPTION_CHECKING
5f5c8ee5 3673 int preempt_count = baud_rate / 2400 + 1;
d012c62b 3674#endif
5f5c8ee5 3675 extern int input_pending;
8fd9a666 3676 extern Lisp_Object do_mouse_tracking;
597cfb3f 3677 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
b96fd3e8 3678#if GLYPH_DEBUG
5f5c8ee5 3679 /* Check that W's frame doesn't have glyph matrices. */
82f4a138 3680 xassert (FRAME_WINDOW_P (XFRAME (WINDOW_FRAME (w))));
4a34b529 3681#endif
5f5c8ee5
GM
3682
3683 /* Check pending input the first time so that we can quickly return. */
a2130dbb
KS
3684#if !PERIODIC_PREEMPTION_CHECKING
3685 if (!force_p)
a2d5fca0 3686 detect_input_pending_ignore_squeezables ();
d012c62b 3687#endif
4588ec20 3688
5f5c8ee5
GM
3689 /* If forced to complete the update, or if no input is pending, do
3690 the update. */
8fd9a666 3691 if (force_p || !input_pending || !NILP (do_mouse_tracking))
4588ec20 3692 {
5f5c8ee5
GM
3693 struct glyph_row *row, *end;
3694 struct glyph_row *mode_line_row;
56974e03 3695 struct glyph_row *header_line_row;
e87b8809 3696 int yb, changed_p = 0, mouse_face_overwritten_p = 0, n_updated;
5f5c8ee5
GM
3697
3698 rif->update_window_begin_hook (w);
3699 yb = window_text_bottom_y (w);
3700
153a073c
PJ
3701 /* If window has a header line, update it before everything else.
3702 Adjust y-positions of other rows by the header line height. */
5f5c8ee5
GM
3703 row = desired_matrix->rows;
3704 end = row + desired_matrix->nrows - 1;
177c0ea7 3705
5f5c8ee5 3706 if (row->mode_line_p)
56974e03
GM
3707 {
3708 header_line_row = row;
3709 ++row;
3710 }
3711 else
3712 header_line_row = NULL;
5f5c8ee5
GM
3713
3714 /* Update the mode line, if necessary. */
3715 mode_line_row = MATRIX_MODE_LINE_ROW (desired_matrix);
3716 if (mode_line_row->mode_line_p && mode_line_row->enabled_p)
3717 {
3718 mode_line_row->y = yb;
3719 update_window_line (w, MATRIX_ROW_VPOS (mode_line_row,
e876ff42
GM
3720 desired_matrix),
3721 &mouse_face_overwritten_p);
5f5c8ee5
GM
3722 }
3723
3724 /* Find first enabled row. Optimizations in redisplay_internal
3725 may lead to an update with only one row enabled. There may
3726 be also completely empty matrices. */
3727 while (row < end && !row->enabled_p)
3728 ++row;
177c0ea7 3729
bfdcafe1 3730 /* Try reusing part of the display by copying. */
5f5c8ee5 3731 if (row < end && !desired_matrix->no_scrolling_p)
56974e03
GM
3732 {
3733 int rc = scrolling_window (w, header_line_row != NULL);
3734 if (rc < 0)
3735 {
3736 /* All rows were found to be equal. */
3737 paused_p = 0;
3738 goto set_cursor;
3739 }
3740 else if (rc > 0)
6b61353c
KH
3741 {
3742 /* We've scrolled the display. */
3743 force_p = 1;
3744 changed_p = 1;
3745 }
5f5c8ee5
GM
3746 }
3747
3748 /* Update the rest of the lines. */
e87b8809 3749 for (n_updated = 0; row < end && (force_p || !input_pending); ++row)
b7412313 3750 if (row->enabled_p)
5f5c8ee5
GM
3751 {
3752 int vpos = MATRIX_ROW_VPOS (row, desired_matrix);
3753 int i;
177c0ea7 3754
153a073c 3755 /* We'll have to play a little bit with when to
5f5c8ee5
GM
3756 detect_input_pending. If it's done too often,
3757 scrolling large windows with repeated scroll-up
3758 commands will too quickly pause redisplay. */
d012c62b
KS
3759#if PERIODIC_PREEMPTION_CHECKING
3760 if (!force_p)
3761 {
3762 EMACS_TIME tm, dif;
3763 EMACS_GET_TIME (tm);
3764 EMACS_SUB_TIME (dif, preemption_next_check, tm);
3765 if (EMACS_TIME_NEG_P (dif))
3766 {
3767 EMACS_ADD_TIME (preemption_next_check, tm, preemption_period);
993d4ab6
KS
3768 if (detect_input_pending_ignore_squeezables ())
3769 break;
d012c62b
KS
3770 }
3771 }
3772#else
e87b8809 3773 if (!force_p && ++n_updated % preempt_count == 0)
a2d5fca0 3774 detect_input_pending_ignore_squeezables ();
d012c62b 3775#endif
e876ff42
GM
3776 changed_p |= update_window_line (w, vpos,
3777 &mouse_face_overwritten_p);
5f5c8ee5
GM
3778
3779 /* Mark all rows below the last visible one in the current
3780 matrix as invalid. This is necessary because of
3781 variable line heights. Consider the case of three
3782 successive redisplays, where the first displays 5
3783 lines, the second 3 lines, and the third 5 lines again.
3784 If the second redisplay wouldn't mark rows in the
3785 current matrix invalid, the third redisplay might be
3786 tempted to optimize redisplay based on lines displayed
3787 in the first redisplay. */
3788 if (MATRIX_ROW_BOTTOM_Y (row) >= yb)
3789 for (i = vpos + 1; i < w->current_matrix->nrows - 1; ++i)
3790 MATRIX_ROW (w->current_matrix, i)->enabled_p = 0;
3791 }
3792
3793 /* Was display preempted? */
3794 paused_p = row < end;
177c0ea7 3795
56974e03 3796 set_cursor:
177c0ea7 3797
6b61353c
KH
3798 /* Update the header line after scrolling because a new header
3799 line would otherwise overwrite lines at the top of the window
3800 that can be scrolled. */
3801 if (header_line_row && header_line_row->enabled_p)
3802 {
3803 header_line_row->y = 0;
3804 update_window_line (w, 0, &mouse_face_overwritten_p);
6b61353c
KH
3805 }
3806
153a073c 3807 /* Fix the appearance of overlapping/overlapped rows. */
5f5c8ee5
GM
3808 if (!paused_p && !w->pseudo_window_p)
3809 {
93e023fc 3810#ifdef HAVE_WINDOW_SYSTEM
e876ff42
GM
3811 if (changed_p && rif->fix_overlapping_area)
3812 {
3813 redraw_overlapped_rows (w, yb);
3814 redraw_overlapping_rows (w, yb);
3815 }
93e023fc 3816#endif
177c0ea7 3817
5f5c8ee5
GM
3818 /* Make cursor visible at cursor position of W. */
3819 set_window_cursor_after_update (w);
3820
e876ff42
GM
3821#if 0 /* Check that current matrix invariants are satisfied. This is
3822 for debugging only. See the comment of check_matrix_invariants. */
5f5c8ee5
GM
3823 IF_DEBUG (check_matrix_invariants (w));
3824#endif
4588ec20 3825 }
5f5c8ee5
GM
3826
3827#if GLYPH_DEBUG
3828 /* Remember the redisplay method used to display the matrix. */
3829 strcpy (w->current_matrix->method, w->desired_matrix->method);
3830#endif
408f5064 3831
6b61353c
KH
3832#ifdef HAVE_WINDOW_SYSTEM
3833 update_window_fringes (w, 0);
3834#endif
3835
56974e03
GM
3836 /* End the update of window W. Don't set the cursor if we
3837 paused updating the display because in this case,
3838 set_window_cursor_after_update hasn't been called, and
3839 output_cursor doesn't contain the cursor location. */
3840 rif->update_window_end_hook (w, !paused_p, mouse_face_overwritten_p);
4588ec20 3841 }
5f5c8ee5
GM
3842 else
3843 paused_p = 1;
3844
2d5912c1 3845#if GLYPH_DEBUG
0cffd9d8 3846 /* check_current_matrix_flags (w); */
9b0e97aa
GM
3847 add_window_display_history (w, w->current_matrix->method, paused_p);
3848#endif
177c0ea7 3849
5f5c8ee5 3850 clear_glyph_matrix (desired_matrix);
408f5064 3851
5f5c8ee5 3852 return paused_p;
4588ec20
JB
3853}
3854
b64b3980 3855
5f5c8ee5
GM
3856/* Update the display of area AREA in window W, row number VPOS.
3857 AREA can be either LEFT_MARGIN_AREA or RIGHT_MARGIN_AREA. */
3858
3859static void
971de7fb 3860update_marginal_area (struct window *w, int area, int vpos)
b64b3980 3861{
5f5c8ee5 3862 struct glyph_row *desired_row = MATRIX_ROW (w->desired_matrix, vpos);
fa971ac3 3863 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
5f5c8ee5
GM
3864
3865 /* Let functions in xterm.c know what area subsequent X positions
3866 will be relative to. */
3867 updated_area = area;
3868
3869 /* Set cursor to start of glyphs, write them, and clear to the end
3870 of the area. I don't think that something more sophisticated is
3871 necessary here, since marginal areas will not be the default. */
3872 rif->cursor_to (vpos, 0, desired_row->y, 0);
3873 if (desired_row->used[area])
3874 rif->write_glyphs (desired_row->glyphs[area], desired_row->used[area]);
3875 rif->clear_end_of_line (-1);
b64b3980 3876}
23b0200c 3877
352f1545 3878
408f5064
GM
3879/* Update the display of the text area of row VPOS in window W.
3880 Value is non-zero if display has changed. */
5f5c8ee5 3881
408f5064 3882static int
971de7fb 3883update_text_area (struct window *w, int vpos)
23b0200c 3884{
5f5c8ee5
GM
3885 struct glyph_row *current_row = MATRIX_ROW (w->current_matrix, vpos);
3886 struct glyph_row *desired_row = MATRIX_ROW (w->desired_matrix, vpos);
fa971ac3 3887 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
408f5064 3888 int changed_p = 0;
5f5c8ee5
GM
3889
3890 /* Let functions in xterm.c know what area subsequent X positions
3891 will be relative to. */
3892 updated_area = TEXT_AREA;
177c0ea7 3893
5f5c8ee5
GM
3894 /* If rows are at different X or Y, or rows have different height,
3895 or the current row is marked invalid, write the entire line. */
3896 if (!current_row->enabled_p
3897 || desired_row->y != current_row->y
3898 || desired_row->ascent != current_row->ascent
408f5064
GM
3899 || desired_row->phys_ascent != current_row->phys_ascent
3900 || desired_row->phys_height != current_row->phys_height
5f5c8ee5 3901 || desired_row->visible_height != current_row->visible_height
408f5064 3902 || current_row->overlapped_p
fee8b690
CY
3903 /* This next line is necessary for correctly redrawing
3904 mouse-face areas after scrolling and other operations.
3905 However, it causes excessive flickering when mouse is moved
3906 across the mode line. Luckily, turning it off for the mode
a75b65c4
KS
3907 line doesn't seem to hurt anything. -- cyd.
3908 But it is still needed for the header line. -- kfs. */
3909 || (current_row->mouse_face_p
3910 && !(current_row->mode_line_p && vpos > 0))
5f5c8ee5
GM
3911 || current_row->x != desired_row->x)
3912 {
3913 rif->cursor_to (vpos, 0, desired_row->y, desired_row->x);
177c0ea7 3914
5f5c8ee5
GM
3915 if (desired_row->used[TEXT_AREA])
3916 rif->write_glyphs (desired_row->glyphs[TEXT_AREA],
3917 desired_row->used[TEXT_AREA]);
177c0ea7 3918
5f5c8ee5
GM
3919 /* Clear to end of window. */
3920 rif->clear_end_of_line (-1);
408f5064 3921 changed_p = 1;
60f2f3f1
GM
3922
3923 /* This erases the cursor. We do this here because
3924 notice_overwritten_cursor cannot easily check this, which
3925 might indicate that the whole functionality of
3926 notice_overwritten_cursor would better be implemented here.
3927 On the other hand, we need notice_overwritten_cursor as long
3928 as mouse highlighting is done asynchronously outside of
3929 redisplay. */
3930 if (vpos == w->phys_cursor.vpos)
3931 w->phys_cursor_on_p = 0;
5f5c8ee5
GM
3932 }
3933 else
3934 {
3935 int stop, i, x;
3936 struct glyph *current_glyph = current_row->glyphs[TEXT_AREA];
3937 struct glyph *desired_glyph = desired_row->glyphs[TEXT_AREA];
e47306e6 3938 int overlapping_glyphs_p = current_row->contains_overlapping_glyphs_p;
074b781a 3939 int desired_stop_pos = desired_row->used[TEXT_AREA];
91d227d9 3940 int abort_skipping = 0;
5f5c8ee5 3941
78897758
YM
3942 /* If the desired row extends its face to the text area end, and
3943 unless the current row also does so at the same position,
5f5c8ee5
GM
3944 make sure we write at least one glyph, so that the face
3945 extension actually takes place. */
78897758
YM
3946 if (MATRIX_ROW_EXTENDS_FACE_P (desired_row)
3947 && (desired_stop_pos < current_row->used[TEXT_AREA]
3948 || (desired_stop_pos == current_row->used[TEXT_AREA]
3949 && !MATRIX_ROW_EXTENDS_FACE_P (current_row))))
074b781a 3950 --desired_stop_pos;
177c0ea7 3951
5f5c8ee5
GM
3952 stop = min (current_row->used[TEXT_AREA], desired_stop_pos);
3953 i = 0;
3954 x = desired_row->x;
8399f8a0
GM
3955
3956 /* Loop over glyphs that current and desired row may have
3957 in common. */
5f5c8ee5 3958 while (i < stop)
352f1545 3959 {
91d227d9 3960 int can_skip_p = !abort_skipping;
177c0ea7 3961
5f5c8ee5 3962 /* Skip over glyphs that both rows have in common. These
e47306e6
GM
3963 don't have to be written. We can't skip if the last
3964 current glyph overlaps the glyph to its right. For
3965 example, consider a current row of `if ' with the `f' in
3966 Courier bold so that it overlaps the ` ' to its right.
3967 If the desired row is ` ', we would skip over the space
3968 after the `if' and there would remain a pixel from the
3969 `f' on the screen. */
3970 if (overlapping_glyphs_p && i > 0)
352f1545 3971 {
e47306e6
GM
3972 struct glyph *glyph = &current_row->glyphs[TEXT_AREA][i - 1];
3973 int left, right;
177c0ea7 3974
e47306e6
GM
3975 rif->get_glyph_overhangs (glyph, XFRAME (w->frame),
3976 &left, &right);
91d227d9 3977 can_skip_p = (right == 0 && !abort_skipping);
352f1545 3978 }
177c0ea7 3979
6d950f4c 3980 if (can_skip_p)
352f1545 3981 {
91d227d9
CY
3982 int start_hpos = i;
3983
6d950f4c
GM
3984 while (i < stop
3985 && GLYPH_EQUAL_P (desired_glyph, current_glyph))
3986 {
3987 x += desired_glyph->pixel_width;
3988 ++desired_glyph, ++current_glyph, ++i;
3989 }
3990
3991 /* Consider the case that the current row contains "xxx
3992 ppp ggg" in italic Courier font, and the desired row
3993 is "xxx ggg". The character `p' has lbearing, `g'
3994 has not. The loop above will stop in front of the
3995 first `p' in the current row. If we would start
3996 writing glyphs there, we wouldn't erase the lbearing
3997 of the `p'. The rest of the lbearing problem is then
641bdbf3 3998 taken care of by draw_glyphs. */
6d950f4c
GM
3999 if (overlapping_glyphs_p
4000 && i > 0
4001 && i < current_row->used[TEXT_AREA]
4002 && (current_row->used[TEXT_AREA]
4003 != desired_row->used[TEXT_AREA]))
5f5c8ee5 4004 {
6d950f4c 4005 int left, right;
177c0ea7 4006
6d950f4c
GM
4007 rif->get_glyph_overhangs (current_glyph, XFRAME (w->frame),
4008 &left, &right);
4009 while (left > 0 && i > 0)
4010 {
4011 --i, --desired_glyph, --current_glyph;
4012 x -= desired_glyph->pixel_width;
4013 left -= desired_glyph->pixel_width;
4014 }
91d227d9
CY
4015
4016 /* Abort the skipping algorithm if we end up before
4017 our starting point, to avoid looping (bug#1070).
4018 This can happen when the lbearing is larger than
4019 the pixel width. */
4020 abort_skipping = (i < start_hpos);
5f5c8ee5 4021 }
352f1545 4022 }
177c0ea7 4023
5f5c8ee5
GM
4024 /* Try to avoid writing the entire rest of the desired row
4025 by looking for a resync point. This mainly prevents
4026 mode line flickering in the case the mode line is in
4027 fixed-pitch font, which it usually will be. */
4028 if (i < desired_row->used[TEXT_AREA])
4029 {
4030 int start_x = x, start_hpos = i;
4031 struct glyph *start = desired_glyph;
4032 int current_x = x;
6d950f4c
GM
4033 int skip_first_p = !can_skip_p;
4034
5f5c8ee5
GM
4035 /* Find the next glyph that's equal again. */
4036 while (i < stop
6d950f4c
GM
4037 && (skip_first_p
4038 || !GLYPH_EQUAL_P (desired_glyph, current_glyph))
5f5c8ee5
GM
4039 && x == current_x)
4040 {
4041 x += desired_glyph->pixel_width;
4042 current_x += current_glyph->pixel_width;
4043 ++desired_glyph, ++current_glyph, ++i;
6d950f4c 4044 skip_first_p = 0;
5f5c8ee5 4045 }
23b0200c 4046
5f5c8ee5
GM
4047 if (i == start_hpos || x != current_x)
4048 {
4049 i = start_hpos;
4050 x = start_x;
4051 desired_glyph = start;
4052 break;
4053 }
e47306e6 4054
5f5c8ee5
GM
4055 rif->cursor_to (vpos, start_hpos, desired_row->y, start_x);
4056 rif->write_glyphs (start, i - start_hpos);
408f5064 4057 changed_p = 1;
5f5c8ee5
GM
4058 }
4059 }
177c0ea7 4060
5f5c8ee5
GM
4061 /* Write the rest. */
4062 if (i < desired_row->used[TEXT_AREA])
4063 {
4064 rif->cursor_to (vpos, i, desired_row->y, x);
4065 rif->write_glyphs (desired_glyph, desired_row->used[TEXT_AREA] - i);
408f5064 4066 changed_p = 1;
5f5c8ee5 4067 }
177c0ea7 4068
5f5c8ee5
GM
4069 /* Maybe clear to end of line. */
4070 if (MATRIX_ROW_EXTENDS_FACE_P (desired_row))
4071 {
4072 /* If new row extends to the end of the text area, nothing
4073 has to be cleared, if and only if we did a write_glyphs
4074 above. This is made sure by setting desired_stop_pos
4075 appropriately above. */
78897758
YM
4076 xassert (i < desired_row->used[TEXT_AREA]
4077 || ((desired_row->used[TEXT_AREA]
4078 == current_row->used[TEXT_AREA])
4079 && MATRIX_ROW_EXTENDS_FACE_P (current_row)));
5f5c8ee5
GM
4080 }
4081 else if (MATRIX_ROW_EXTENDS_FACE_P (current_row))
4082 {
4083 /* If old row extends to the end of the text area, clear. */
4084 if (i >= desired_row->used[TEXT_AREA])
4085 rif->cursor_to (vpos, i, desired_row->y,
6b61353c 4086 desired_row->pixel_width);
5f5c8ee5 4087 rif->clear_end_of_line (-1);
408f5064 4088 changed_p = 1;
5f5c8ee5
GM
4089 }
4090 else if (desired_row->pixel_width < current_row->pixel_width)
2e8907d3 4091 {
5f5c8ee5
GM
4092 /* Otherwise clear to the end of the old row. Everything
4093 after that position should be clear already. */
4094 int x;
177c0ea7 4095
5f5c8ee5
GM
4096 if (i >= desired_row->used[TEXT_AREA])
4097 rif->cursor_to (vpos, i, desired_row->y,
6b61353c 4098 desired_row->pixel_width);
5f5c8ee5
GM
4099
4100 /* If cursor is displayed at the end of the line, make sure
4101 it's cleared. Nowadays we don't have a phys_cursor_glyph
4102 with which to erase the cursor (because this method
4103 doesn't work with lbearing/rbearing), so we must do it
4104 this way. */
4105 if (vpos == w->phys_cursor.vpos
f951a506
EZ
4106 && (desired_row->reversed_p
4107 ? (w->phys_cursor.hpos < 0)
4108 : (w->phys_cursor.hpos >= desired_row->used[TEXT_AREA])))
5f5c8ee5
GM
4109 {
4110 w->phys_cursor_on_p = 0;
4111 x = -1;
4112 }
4113 else
6b61353c 4114 x = current_row->pixel_width;
5f5c8ee5 4115 rif->clear_end_of_line (x);
408f5064 4116 changed_p = 1;
2e8907d3 4117 }
23b0200c 4118 }
408f5064
GM
4119
4120 return changed_p;
23b0200c 4121}
4588ec20 4122
5f5c8ee5 4123
408f5064
GM
4124/* Update row VPOS in window W. Value is non-zero if display has been
4125 changed. */
5f5c8ee5 4126
408f5064 4127static int
971de7fb 4128update_window_line (struct window *w, int vpos, int *mouse_face_overwritten_p)
5f5c8ee5
GM
4129{
4130 struct glyph_row *current_row = MATRIX_ROW (w->current_matrix, vpos);
4131 struct glyph_row *desired_row = MATRIX_ROW (w->desired_matrix, vpos);
fa971ac3 4132 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
408f5064 4133 int changed_p = 0;
5f5c8ee5 4134
5f5c8ee5
GM
4135 /* Set the row being updated. This is important to let xterm.c
4136 know what line height values are in effect. */
4137 updated_row = desired_row;
4138
177c0ea7
JB
4139 /* A row can be completely invisible in case a desired matrix was
4140 built with a vscroll and then make_cursor_line_fully_visible shifts
504805ac
GM
4141 the matrix. Make sure to make such rows current anyway, since
4142 we need the correct y-position, for example, in the current matrix. */
001f93f3
GM
4143 if (desired_row->mode_line_p
4144 || desired_row->visible_height > 0)
408f5064 4145 {
504805ac
GM
4146 xassert (desired_row->enabled_p);
4147
4148 /* Update display of the left margin area, if there is one. */
4149 if (!desired_row->full_width_p
7df02016 4150 && !NILP (w->left_margin_cols))
504805ac
GM
4151 {
4152 changed_p = 1;
4153 update_marginal_area (w, LEFT_MARGIN_AREA, vpos);
4154 }
177c0ea7 4155
504805ac
GM
4156 /* Update the display of the text area. */
4157 if (update_text_area (w, vpos))
4158 {
4159 changed_p = 1;
4160 if (current_row->mouse_face_p)
4161 *mouse_face_overwritten_p = 1;
4162 }
177c0ea7 4163
504805ac
GM
4164 /* Update display of the right margin area, if there is one. */
4165 if (!desired_row->full_width_p
7df02016 4166 && !NILP (w->right_margin_cols))
504805ac
GM
4167 {
4168 changed_p = 1;
4169 update_marginal_area (w, RIGHT_MARGIN_AREA, vpos);
4170 }
177c0ea7 4171
504805ac
GM
4172 /* Draw truncation marks etc. */
4173 if (!current_row->enabled_p
4174 || desired_row->y != current_row->y
4175 || desired_row->visible_height != current_row->visible_height
6b61353c 4176 || desired_row->cursor_in_fringe_p != current_row->cursor_in_fringe_p
3d4a365f 4177 || desired_row->overlay_arrow_bitmap != current_row->overlay_arrow_bitmap
6b61353c 4178 || current_row->redraw_fringe_bitmaps_p
504805ac 4179 || desired_row->mode_line_p != current_row->mode_line_p
6b61353c 4180 || desired_row->exact_window_width_line_p != current_row->exact_window_width_line_p
504805ac
GM
4181 || (MATRIX_ROW_CONTINUATION_LINE_P (desired_row)
4182 != MATRIX_ROW_CONTINUATION_LINE_P (current_row)))
4183 rif->after_update_window_line_hook (desired_row);
408f5064 4184 }
177c0ea7 4185
5f5c8ee5
GM
4186 /* Update current_row from desired_row. */
4187 make_current (w->desired_matrix, w->current_matrix, vpos);
4188 updated_row = NULL;
408f5064 4189 return changed_p;
5f5c8ee5
GM
4190}
4191
4192
4193/* Set the cursor after an update of window W. This function may only
4194 be called from update_window. */
4195
4196static void
971de7fb 4197set_window_cursor_after_update (struct window *w)
4588ec20 4198{
5f5c8ee5 4199 struct frame *f = XFRAME (w->frame);
fa971ac3 4200 struct redisplay_interface *rif = FRAME_RIF (f);
5f5c8ee5
GM
4201 int cx, cy, vpos, hpos;
4202
4203 /* Not intended for frame matrix updates. */
4204 xassert (FRAME_WINDOW_P (f));
177c0ea7 4205
b96fd3e8
GM
4206 if (cursor_in_echo_area
4207 && !NILP (echo_area_buffer[0])
4208 /* If we are showing a message instead of the mini-buffer,
4209 show the cursor for the message instead. */
4210 && XWINDOW (minibuf_window) == w
4211 && EQ (minibuf_window, echo_area_window)
5f5c8ee5
GM
4212 /* These cases apply only to the frame that contains
4213 the active mini-buffer window. */
4214 && FRAME_HAS_MINIBUF_P (f)
4215 && EQ (FRAME_MINIBUF_WINDOW (f), echo_area_window))
4216 {
4217 cx = cy = vpos = hpos = 0;
4218
4219 if (cursor_in_echo_area >= 0)
4220 {
4221 /* If the mini-buffer is several lines high, find the last
4222 line that has any text on it. Note: either all lines
4223 are enabled or none. Otherwise we wouldn't be able to
4224 determine Y. */
862b4790
GM
4225 struct glyph_row *row, *last_row;
4226 struct glyph *glyph;
4227 int yb = window_text_bottom_y (w);
5f5c8ee5 4228
862b4790 4229 last_row = NULL;
6206f8ce
GM
4230 row = w->current_matrix->rows;
4231 while (row->enabled_p
4232 && (last_row == NULL
4233 || MATRIX_ROW_BOTTOM_Y (row) <= yb))
5f5c8ee5 4234 {
862b4790
GM
4235 if (row->used[TEXT_AREA]
4236 && row->glyphs[TEXT_AREA][0].charpos >= 0)
4237 last_row = row;
6206f8ce 4238 ++row;
862b4790 4239 }
177c0ea7 4240
5f5c8ee5
GM
4241 if (last_row)
4242 {
6206f8ce
GM
4243 struct glyph *start = last_row->glyphs[TEXT_AREA];
4244 struct glyph *last = start + last_row->used[TEXT_AREA] - 1;
862b4790 4245
b96fd3e8 4246 while (last > start && last->charpos < 0)
862b4790 4247 --last;
177c0ea7 4248
862b4790
GM
4249 for (glyph = start; glyph < last; ++glyph)
4250 {
4251 cx += glyph->pixel_width;
4252 ++hpos;
4253 }
4254
5f5c8ee5 4255 cy = last_row->y;
862b4790 4256 vpos = MATRIX_ROW_VPOS (last_row, w->current_matrix);
5f5c8ee5
GM
4257 }
4258 }
4259 }
4260 else
4261 {
4262 cx = w->cursor.x;
4263 cy = w->cursor.y;
4264 hpos = w->cursor.hpos;
4265 vpos = w->cursor.vpos;
4266 }
4588ec20 4267
5f5c8ee5 4268 /* Window cursor can be out of sync for horizontally split windows. */
f951a506 4269 hpos = max (-1, hpos); /* -1 is for when cursor is on the left fringe */
5f5c8ee5
GM
4270 hpos = min (w->current_matrix->matrix_w - 1, hpos);
4271 vpos = max (0, vpos);
4272 vpos = min (w->current_matrix->nrows - 1, vpos);
4273 rif->cursor_to (vpos, hpos, cy, cx);
4588ec20 4274}
4588ec20 4275
5f5c8ee5 4276
6df5d75f
GM
4277/* Set WINDOW->must_be_updated_p to ON_P for all windows in the window
4278 tree rooted at W. */
4279
4280void
971de7fb 4281set_window_update_flags (struct window *w, int on_p)
6df5d75f
GM
4282{
4283 while (w)
4284 {
4285 if (!NILP (w->hchild))
4286 set_window_update_flags (XWINDOW (w->hchild), on_p);
4287 else if (!NILP (w->vchild))
4288 set_window_update_flags (XWINDOW (w->vchild), on_p);
4289 else
4290 w->must_be_updated_p = on_p;
4291
4292 w = NILP (w->next) ? 0 : XWINDOW (w->next);
4293 }
177c0ea7 4294}
6df5d75f
GM
4295
4296
4297\f
4298/***********************************************************************
4299 Window-Based Scrolling
4300 ***********************************************************************/
4301
4302/* Structure describing rows in scrolling_window. */
4303
4304struct row_entry
4305{
4306 /* Number of occurrences of this row in desired and current matrix. */
4307 int old_uses, new_uses;
177c0ea7 4308
6df5d75f
GM
4309 /* Vpos of row in new matrix. */
4310 int new_line_number;
4311
4312 /* Bucket index of this row_entry in the hash table row_table. */
4313 int bucket;
177c0ea7 4314
6df5d75f
GM
4315 /* The row described by this entry. */
4316 struct glyph_row *row;
177c0ea7 4317
6df5d75f
GM
4318 /* Hash collision chain. */
4319 struct row_entry *next;
4320};
4321
4322/* A pool to allocate row_entry structures from, and the size of the
4323 pool. The pool is reallocated in scrolling_window when we find
4324 that we need a larger one. */
4325
4326static struct row_entry *row_entry_pool;
4327static int row_entry_pool_size;
4328
4329/* Index of next free entry in row_entry_pool. */
4330
4331static int row_entry_idx;
4332
4333/* The hash table used during scrolling, and the table's size. This
4334 table is used to quickly identify equal rows in the desired and
4335 current matrix. */
4336
4337static struct row_entry **row_table;
4338static int row_table_size;
4339
4340/* Vectors of pointers to row_entry structures belonging to the
4341 current and desired matrix, and the size of the vectors. */
4342
4343static struct row_entry **old_lines, **new_lines;
4344static int old_lines_size, new_lines_size;
4345
4346/* A pool to allocate run structures from, and its size. */
4347
4348static struct run *run_pool;
4349static int runs_size;
4350
4351/* A vector of runs of lines found during scrolling. */
4352
4353static struct run **runs;
4354
6df5d75f
GM
4355/* Add glyph row ROW to the scrolling hash table during the scrolling
4356 of window W. */
4357
4358static INLINE struct row_entry *
971de7fb 4359add_row_entry (struct window *w, struct glyph_row *row)
6df5d75f
GM
4360{
4361 struct row_entry *entry;
4362 int i = row->hash % row_table_size;
177c0ea7 4363
6df5d75f 4364 entry = row_table[i];
e4e0bee9 4365 while (entry && !row_equal_p (w, entry->row, row, 1))
6df5d75f 4366 entry = entry->next;
177c0ea7 4367
6df5d75f
GM
4368 if (entry == NULL)
4369 {
4370 entry = row_entry_pool + row_entry_idx++;
4371 entry->row = row;
4372 entry->old_uses = entry->new_uses = 0;
4373 entry->new_line_number = 0;
4374 entry->bucket = i;
4375 entry->next = row_table[i];
4376 row_table[i] = entry;
4377 }
4378
4379 return entry;
4380}
4381
4382
5f5c8ee5 4383/* Try to reuse part of the current display of W by scrolling lines.
153a073c 4384 HEADER_LINE_P non-zero means W has a header line.
5f5c8ee5
GM
4385
4386 The algorithm is taken from Communications of the ACM, Apr78 "A
4387 Technique for Isolating Differences Between Files." It should take
4388 O(N) time.
4389
4390 A short outline of the steps of the algorithm
4391
4392 1. Skip lines equal at the start and end of both matrices.
4393
4394 2. Enter rows in the current and desired matrix into a symbol
4395 table, counting how often they appear in both matrices.
4396
4397 3. Rows that appear exactly once in both matrices serve as anchors,
4398 i.e. we assume that such lines are likely to have been moved.
4399
4400 4. Starting from anchor lines, extend regions to be scrolled both
4401 forward and backward.
4402
4403 Value is
4404
4405 -1 if all rows were found to be equal.
4406 0 to indicate that we did not scroll the display, or
4407 1 if we did scroll. */
4408
4409static int
971de7fb 4410scrolling_window (struct window *w, int header_line_p)
4588ec20 4411{
5f5c8ee5
GM
4412 struct glyph_matrix *desired_matrix = w->desired_matrix;
4413 struct glyph_matrix *current_matrix = w->current_matrix;
4414 int yb = window_text_bottom_y (w);
6df5d75f
GM
4415 int i, j, first_old, first_new, last_old, last_new;
4416 int nruns, nbytes, n, run_idx;
4417 struct row_entry *entry;
fa971ac3 4418 struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
5f5c8ee5
GM
4419
4420 /* Skip over rows equal at the start. */
bfdcafe1 4421 for (i = header_line_p ? 1 : 0; i < current_matrix->nrows - 1; ++i)
5f5c8ee5 4422 {
bfdcafe1
GM
4423 struct glyph_row *d = MATRIX_ROW (desired_matrix, i);
4424 struct glyph_row *c = MATRIX_ROW (current_matrix, i);
4425
4426 if (c->enabled_p
4427 && d->enabled_p
6b61353c 4428 && !d->redraw_fringe_bitmaps_p
bfdcafe1
GM
4429 && c->y == d->y
4430 && MATRIX_ROW_BOTTOM_Y (c) <= yb
4431 && MATRIX_ROW_BOTTOM_Y (d) <= yb
4432 && row_equal_p (w, c, d, 1))
4433 {
4434 assign_row (c, d);
4435 d->enabled_p = 0;
4436 }
4437 else
4438 break;
5f5c8ee5 4439 }
4588ec20 4440
5f5c8ee5
GM
4441 /* Give up if some rows in the desired matrix are not enabled. */
4442 if (!MATRIX_ROW (desired_matrix, i)->enabled_p)
4443 return -1;
177c0ea7 4444
5f5c8ee5
GM
4445 first_old = first_new = i;
4446
4447 /* Set last_new to the index + 1 of the last enabled row in the
4448 desired matrix. */
4449 i = first_new + 1;
4450 while (i < desired_matrix->nrows - 1
4451 && MATRIX_ROW (desired_matrix, i)->enabled_p
6df5d75f 4452 && MATRIX_ROW_BOTTOM_Y (MATRIX_ROW (desired_matrix, i)) <= yb)
5f5c8ee5
GM
4453 ++i;
4454
4455 if (!MATRIX_ROW (desired_matrix, i)->enabled_p)
4456 return 0;
4457
4458 last_new = i;
4459
4460 /* Set last_old to the index + 1 of the last enabled row in the
4461 current matrix. We don't look at the enabled flag here because
4462 we plan to reuse part of the display even if other parts are
4463 disabled. */
4464 i = first_old + 1;
93962bfa
GM
4465 while (i < current_matrix->nrows - 1)
4466 {
4467 int bottom = MATRIX_ROW_BOTTOM_Y (MATRIX_ROW (current_matrix, i));
4468 if (bottom <= yb)
4469 ++i;
4470 if (bottom >= yb)
4471 break;
4472 }
4473
5f5c8ee5
GM
4474 last_old = i;
4475
4476 /* Skip over rows equal at the bottom. */
4477 i = last_new;
4478 j = last_old;
4479 while (i - 1 > first_new
4480 && j - 1 > first_old
4481 && MATRIX_ROW (current_matrix, i - 1)->enabled_p
4482 && (MATRIX_ROW (current_matrix, i - 1)->y
4483 == MATRIX_ROW (desired_matrix, j - 1)->y)
6b61353c 4484 && !MATRIX_ROW (desired_matrix, j - 1)->redraw_fringe_bitmaps_p
5f5c8ee5
GM
4485 && row_equal_p (w,
4486 MATRIX_ROW (desired_matrix, i - 1),
e4e0bee9 4487 MATRIX_ROW (current_matrix, j - 1), 1))
5f5c8ee5
GM
4488 --i, --j;
4489 last_new = i;
4490 last_old = j;
4491
4492 /* Nothing to do if all rows are equal. */
4493 if (last_new == first_new)
4494 return 0;
4495
6df5d75f 4496 /* Reallocate vectors, tables etc. if necessary. */
177c0ea7 4497
6df5d75f
GM
4498 if (current_matrix->nrows > old_lines_size)
4499 {
4500 old_lines_size = current_matrix->nrows;
4501 nbytes = old_lines_size * sizeof *old_lines;
4502 old_lines = (struct row_entry **) xrealloc (old_lines, nbytes);
4503 }
177c0ea7 4504
6df5d75f
GM
4505 if (desired_matrix->nrows > new_lines_size)
4506 {
4507 new_lines_size = desired_matrix->nrows;
4508 nbytes = new_lines_size * sizeof *new_lines;
4509 new_lines = (struct row_entry **) xrealloc (new_lines, nbytes);
4510 }
4511
4512 n = desired_matrix->nrows + current_matrix->nrows;
4513 if (3 * n > row_table_size)
4514 {
4515 row_table_size = next_almost_prime (3 * n);
4516 nbytes = row_table_size * sizeof *row_table;
4517 row_table = (struct row_entry **) xrealloc (row_table, nbytes);
72af86bd 4518 memset (row_table, 0, nbytes);
6df5d75f
GM
4519 }
4520
4521 if (n > row_entry_pool_size)
4522 {
4523 row_entry_pool_size = n;
4524 nbytes = row_entry_pool_size * sizeof *row_entry_pool;
4525 row_entry_pool = (struct row_entry *) xrealloc (row_entry_pool, nbytes);
4526 }
4527
4528 if (desired_matrix->nrows > runs_size)
4529 {
4530 runs_size = desired_matrix->nrows;
4531 nbytes = runs_size * sizeof *runs;
4532 runs = (struct run **) xrealloc (runs, nbytes);
4533 nbytes = runs_size * sizeof *run_pool;
4534 run_pool = (struct run *) xrealloc (run_pool, nbytes);
4535 }
4536
4537 nruns = run_idx = 0;
4538 row_entry_idx = 0;
4539
4540 /* Add rows from the current and desired matrix to the hash table
4541 row_hash_table to be able to find equal ones quickly. */
177c0ea7 4542
5f5c8ee5
GM
4543 for (i = first_old; i < last_old; ++i)
4544 {
4545 if (MATRIX_ROW (current_matrix, i)->enabled_p)
4546 {
6df5d75f
GM
4547 entry = add_row_entry (w, MATRIX_ROW (current_matrix, i));
4548 old_lines[i] = entry;
4549 ++entry->old_uses;
5f5c8ee5
GM
4550 }
4551 else
6df5d75f 4552 old_lines[i] = NULL;
5f5c8ee5
GM
4553 }
4554
5f5c8ee5
GM
4555 for (i = first_new; i < last_new; ++i)
4556 {
4557 xassert (MATRIX_ROW_ENABLED_P (desired_matrix, i));
6df5d75f
GM
4558 entry = add_row_entry (w, MATRIX_ROW (desired_matrix, i));
4559 ++entry->new_uses;
4560 entry->new_line_number = i;
4561 new_lines[i] = entry;
5f5c8ee5 4562 }
4588ec20 4563
5f5c8ee5
GM
4564 /* Identify moves based on lines that are unique and equal
4565 in both matrices. */
4566 for (i = first_old; i < last_old;)
6df5d75f
GM
4567 if (old_lines[i]
4568 && old_lines[i]->old_uses == 1
4569 && old_lines[i]->new_uses == 1)
5f5c8ee5
GM
4570 {
4571 int j, k;
6df5d75f
GM
4572 int new_line = old_lines[i]->new_line_number;
4573 struct run *run = run_pool + run_idx++;
5f5c8ee5
GM
4574
4575 /* Record move. */
4576 run->current_vpos = i;
4577 run->current_y = MATRIX_ROW (current_matrix, i)->y;
4578 run->desired_vpos = new_line;
4579 run->desired_y = MATRIX_ROW (desired_matrix, new_line)->y;
4580 run->nrows = 1;
4581 run->height = MATRIX_ROW (current_matrix, i)->height;
4582
4583 /* Extend backward. */
4584 j = i - 1;
4585 k = new_line - 1;
4586 while (j > first_old
4587 && k > first_new
6df5d75f 4588 && old_lines[j] == new_lines[k])
5f5c8ee5
GM
4589 {
4590 int h = MATRIX_ROW (current_matrix, j)->height;
177c0ea7
JB
4591 --run->current_vpos;
4592 --run->desired_vpos;
5f5c8ee5
GM
4593 ++run->nrows;
4594 run->height += h;
4595 run->desired_y -= h;
4596 run->current_y -= h;
4597 --j, --k;
4598 }
4588ec20 4599
5f5c8ee5
GM
4600 /* Extend forward. */
4601 j = i + 1;
4602 k = new_line + 1;
4603 while (j < last_old
4604 && k < last_new
6df5d75f 4605 && old_lines[j] == new_lines[k])
5f5c8ee5
GM
4606 {
4607 int h = MATRIX_ROW (current_matrix, j)->height;
177c0ea7 4608 ++run->nrows;
5f5c8ee5
GM
4609 run->height += h;
4610 ++j, ++k;
4611 }
19dff8dc 4612
5f5c8ee5
GM
4613 /* Insert run into list of all runs. Order runs by copied
4614 pixel lines. Note that we record runs that don't have to
4615 be copied because they are already in place. This is done
4616 because we can avoid calling update_window_line in this
4617 case. */
4618 for (j = 0; j < nruns && runs[j]->height > run->height; ++j)
4619 ;
2b4ec4d7 4620 for (k = nruns; k > j; --k)
5f5c8ee5
GM
4621 runs[k] = runs[k - 1];
4622 runs[j] = run;
4623 ++nruns;
4624
4625 i += run->nrows;
4626 }
4627 else
4628 ++i;
4588ec20 4629
5f5c8ee5
GM
4630 /* Do the moves. Do it in a way that we don't overwrite something
4631 we want to copy later on. This is not solvable in general
4632 because there is only one display and we don't have a way to
4633 exchange areas on this display. Example:
4588ec20 4634
5f5c8ee5
GM
4635 +-----------+ +-----------+
4636 | A | | B |
4637 +-----------+ --> +-----------+
4638 | B | | A |
4639 +-----------+ +-----------+
4588ec20 4640
5f5c8ee5
GM
4641 Instead, prefer bigger moves, and invalidate moves that would
4642 copy from where we copied to. */
ea0d86af 4643
5f5c8ee5
GM
4644 for (i = 0; i < nruns; ++i)
4645 if (runs[i]->nrows > 0)
4646 {
4647 struct run *r = runs[i];
24e86043 4648
5f5c8ee5
GM
4649 /* Copy on the display. */
4650 if (r->current_y != r->desired_y)
4651 {
4652 rif->scroll_run_hook (w, r);
4653
4654 /* Invalidate runs that copy from where we copied to. */
4655 for (j = i + 1; j < nruns; ++j)
4656 {
4657 struct run *p = runs[j];
177c0ea7 4658
5f5c8ee5
GM
4659 if ((p->current_y >= r->desired_y
4660 && p->current_y < r->desired_y + r->height)
4661 || (p->current_y + p->height >= r->desired_y
4662 && (p->current_y + p->height
4663 < r->desired_y + r->height)))
4664 p->nrows = 0;
4665 }
4666 }
ea0d86af 4667
5f5c8ee5
GM
4668 /* Assign matrix rows. */
4669 for (j = 0; j < r->nrows; ++j)
4670 {
4671 struct glyph_row *from, *to;
408f5064 4672 int to_overlapped_p;
e876ff42 4673
5f5c8ee5
GM
4674 to = MATRIX_ROW (current_matrix, r->desired_vpos + j);
4675 from = MATRIX_ROW (desired_matrix, r->desired_vpos + j);
e876ff42 4676 to_overlapped_p = to->overlapped_p;
6b61353c
KH
4677 if (!from->mode_line_p && !w->pseudo_window_p
4678 && (to->left_fringe_bitmap != from->left_fringe_bitmap
4679 || to->right_fringe_bitmap != from->right_fringe_bitmap
4680 || to->left_fringe_face_id != from->left_fringe_face_id
4681 || to->right_fringe_face_id != from->right_fringe_face_id
3d4a365f 4682 || to->overlay_arrow_bitmap != from->overlay_arrow_bitmap))
6b61353c 4683 from->redraw_fringe_bitmaps_p = 1;
5f5c8ee5
GM
4684 assign_row (to, from);
4685 to->enabled_p = 1, from->enabled_p = 0;
408f5064 4686 to->overlapped_p = to_overlapped_p;
5f5c8ee5
GM
4687 }
4688 }
15874c59 4689
6df5d75f
GM
4690 /* Clear the hash table, for the next time. */
4691 for (i = 0; i < row_entry_idx; ++i)
4692 row_table[row_entry_pool[i].bucket] = NULL;
4693
6b61353c
KH
4694 /* Value is > 0 to indicate that we scrolled the display. */
4695 return nruns;
5f5c8ee5 4696}
de83c314 4697
15874c59 4698
4588ec20 4699\f
5f5c8ee5
GM
4700/************************************************************************
4701 Frame-Based Updates
4702 ************************************************************************/
4588ec20 4703
5f5c8ee5 4704/* Update the desired frame matrix of frame F.
4588ec20 4705
5f5c8ee5
GM
4706 FORCE_P non-zero means that the update should not be stopped by
4707 pending input. INHIBIT_HAIRY_ID_P non-zero means that scrolling
4708 should not be tried.
4709
4710 Value is non-zero if update was stopped due to pending input. */
4711
4712static int
971de7fb 4713update_frame_1 (struct frame *f, int force_p, int inhibit_id_p)
4588ec20 4714{
5f5c8ee5
GM
4715 /* Frame matrices to work on. */
4716 struct glyph_matrix *current_matrix = f->current_matrix;
4717 struct glyph_matrix *desired_matrix = f->desired_matrix;
4718 int i;
4588ec20
JB
4719 int pause;
4720 int preempt_count = baud_rate / 2400 + 1;
dfcf069d 4721 extern int input_pending;
5f5c8ee5
GM
4722
4723 xassert (current_matrix && desired_matrix);
4588ec20 4724
c37e4889
RS
4725 if (baud_rate != FRAME_COST_BAUD_RATE (f))
4726 calculate_costs (f);
4727
d88c2b9e
RS
4728 if (preempt_count <= 0)
4729 preempt_count = 1;
4730
a2130dbb
KS
4731#if !PERIODIC_PREEMPTION_CHECKING
4732 if (!force_p && detect_input_pending_ignore_squeezables ())
4588ec20
JB
4733 {
4734 pause = 1;
4735 goto do_pause;
4736 }
d012c62b 4737#endif
4588ec20 4738
5f5c8ee5 4739 /* If we cannot insert/delete lines, it's no use trying it. */
daf01701 4740 if (!FRAME_LINE_INS_DEL_OK (f))
5f5c8ee5 4741 inhibit_id_p = 1;
7098a0fa 4742
efb859b4 4743 /* See if any of the desired lines are enabled; don't compute for
5f5c8ee5
GM
4744 i/d line if just want cursor motion. */
4745 for (i = 0; i < desired_matrix->nrows; i++)
4746 if (MATRIX_ROW_ENABLED_P (desired_matrix, i))
4588ec20
JB
4747 break;
4748
4749 /* Try doing i/d line, if not yet inhibited. */
5f5c8ee5
GM
4750 if (!inhibit_id_p && i < desired_matrix->nrows)
4751 force_p |= scrolling (f);
4588ec20
JB
4752
4753 /* Update the individual lines as needed. Do bottom line first. */
5f5c8ee5
GM
4754 if (MATRIX_ROW_ENABLED_P (desired_matrix, desired_matrix->nrows - 1))
4755 update_frame_line (f, desired_matrix->nrows - 1);
4588ec20 4756
5f5c8ee5
GM
4757 /* Now update the rest of the lines. */
4758 for (i = 0; i < desired_matrix->nrows - 1 && (force_p || !input_pending); i++)
4588ec20 4759 {
5f5c8ee5 4760 if (MATRIX_ROW_ENABLED_P (desired_matrix, i))
4588ec20 4761 {
b6a65ac2 4762 if (FRAME_TERMCAP_P (f))
4588ec20
JB
4763 {
4764 /* Flush out every so many lines.
4765 Also flush out if likely to have more than 1k buffered
4766 otherwise. I'm told that some telnet connections get
4767 really screwed by more than 1k output at once. */
fced92f1
CY
4768 FILE *display_output = FRAME_TTY (f)->output;
4769 if (display_output)
4588ec20 4770 {
fced92f1
CY
4771 int outq = PENDING_OUTPUT_COUNT (display_output);
4772 if (outq > 900
4773 || (outq > 20 && ((i - 1) % preempt_count == 0)))
4588ec20 4774 {
fced92f1
CY
4775 fflush (display_output);
4776 if (preempt_count == 1)
4777 {
a41f8bed 4778#ifdef EMACS_OUTQSIZE
fced92f1
CY
4779 if (EMACS_OUTQSIZE (0, &outq) < 0)
4780 /* Probably not a tty. Ignore the error and reset
4781 the outq count. */
4782 outq = PENDING_OUTPUT_COUNT (FRAME_TTY (f->output));
4588ec20 4783#endif
fced92f1
CY
4784 outq *= 10;
4785 if (baud_rate <= outq && baud_rate > 0)
4786 sleep (outq / baud_rate);
4787 }
4588ec20
JB
4788 }
4789 }
4588ec20
JB
4790 }
4791
d012c62b
KS
4792#if PERIODIC_PREEMPTION_CHECKING
4793 if (!force_p)
4794 {
4795 EMACS_TIME tm, dif;
4796 EMACS_GET_TIME (tm);
4797 EMACS_SUB_TIME (dif, preemption_next_check, tm);
4798 if (EMACS_TIME_NEG_P (dif))
4799 {
4800 EMACS_ADD_TIME (preemption_next_check, tm, preemption_period);
993d4ab6
KS
4801 if (detect_input_pending_ignore_squeezables ())
4802 break;
d012c62b
KS
4803 }
4804 }
4805#else
4806 if (!force_p && (i - 1) % preempt_count == 0)
a2d5fca0 4807 detect_input_pending_ignore_squeezables ();
d012c62b 4808#endif
a2960116 4809
5f5c8ee5 4810 update_frame_line (f, i);
4588ec20 4811 }
4588ec20 4812 }
177c0ea7 4813
7df02016 4814 pause = (i < FRAME_LINES (f) - 1) ? i : 0;
4588ec20
JB
4815
4816 /* Now just clean up termcap drivers and set cursor, etc. */
4817 if (!pause)
4818 {
48cf7030 4819 if ((cursor_in_echo_area
5f5c8ee5 4820 /* If we are showing a message instead of the mini-buffer,
2577053b 4821 show the cursor for the message instead of for the
5f5c8ee5 4822 (now hidden) mini-buffer contents. */
2577053b
RS
4823 || (EQ (minibuf_window, selected_window)
4824 && EQ (minibuf_window, echo_area_window)
b96fd3e8 4825 && !NILP (echo_area_buffer[0])))
2577053b 4826 /* These cases apply only to the frame that contains
5f5c8ee5 4827 the active mini-buffer window. */
2577053b 4828 && FRAME_HAS_MINIBUF_P (f)
140f8645 4829 && EQ (FRAME_MINIBUF_WINDOW (f), echo_area_window))
1113d9db 4830 {
7df02016 4831 int top = WINDOW_TOP_EDGE_LINE (XWINDOW (FRAME_MINIBUF_WINDOW (f)));
648fa17d
JB
4832 int row, col;
4833
4834 if (cursor_in_echo_area < 0)
4835 {
5f5c8ee5
GM
4836 /* Negative value of cursor_in_echo_area means put
4837 cursor at beginning of line. */
648fa17d
JB
4838 row = top;
4839 col = 0;
4840 }
1113d9db 4841 else
648fa17d 4842 {
5f5c8ee5
GM
4843 /* Positive value of cursor_in_echo_area means put
4844 cursor at the end of the prompt. If the mini-buffer
4845 is several lines high, find the last line that has
4846 any text on it. */
7df02016 4847 row = FRAME_LINES (f);
177c0ea7 4848 do
648fa17d 4849 {
5f5c8ee5
GM
4850 --row;
4851 col = 0;
177c0ea7 4852
5f5c8ee5
GM
4853 if (MATRIX_ROW_ENABLED_P (current_matrix, row))
4854 {
4855 /* Frame rows are filled up with spaces that
4856 must be ignored here. */
5f5c8ee5
GM
4857 struct glyph_row *r = MATRIX_ROW (current_matrix,
4858 row);
4859 struct glyph *start = r->glyphs[TEXT_AREA];
4860 struct glyph *last = start + r->used[TEXT_AREA];
4861
4862 while (last > start
4863 && (last - 1)->charpos < 0)
4864 --last;
177c0ea7 4865
5f5c8ee5
GM
4866 col = last - start;
4867 }
648fa17d
JB
4868 }
4869 while (row > top && col == 0);
4870
6395da5c 4871 /* Make sure COL is not out of range. */
868e640e 4872 if (col >= FRAME_CURSOR_X_LIMIT (f))
648fa17d 4873 {
6395da5c 4874 /* If we have another row, advance cursor into it. */
7df02016 4875 if (row < FRAME_LINES (f) - 1)
6395da5c 4876 {
7df02016 4877 col = FRAME_LEFT_SCROLL_BAR_COLS (f);
6395da5c
RS
4878 row++;
4879 }
4880 /* Otherwise move it back in range. */
4881 else
868e640e 4882 col = FRAME_CURSOR_X_LIMIT (f) - 1;
648fa17d
JB
4883 }
4884 }
4885
385ed61f 4886 cursor_to (f, row, col);
1113d9db 4887 }
4588ec20 4888 else
5f5c8ee5
GM
4889 {
4890 /* We have only one cursor on terminal frames. Use it to
4891 display the cursor of the selected window. */
4892 struct window *w = XWINDOW (FRAME_SELECTED_WINDOW (f));
a871441d
GM
4893 if (w->cursor.vpos >= 0
4894 /* The cursor vpos may be temporarily out of bounds
4895 in the following situation: There is one window,
4896 with the cursor in the lower half of it. The window
4897 is split, and a message causes a redisplay before
4898 a new cursor position has been computed. */
7df02016 4899 && w->cursor.vpos < WINDOW_TOTAL_LINES (w))
5f5c8ee5
GM
4900 {
4901 int x = WINDOW_TO_FRAME_HPOS (w, w->cursor.hpos);
4902 int y = WINDOW_TO_FRAME_VPOS (w, w->cursor.vpos);
4903
7df02016
KS
4904 if (INTEGERP (w->left_margin_cols))
4905 x += XFASTINT (w->left_margin_cols);
177c0ea7 4906
7df02016 4907 /* x = max (min (x, FRAME_TOTAL_COLS (f) - 1), 0); */
385ed61f 4908 cursor_to (f, y, x);
5f5c8ee5
GM
4909 }
4910 }
4588ec20
JB
4911 }
4912
4588ec20
JB
4913 do_pause:
4914
5f5c8ee5 4915 clear_desired_matrices (f);
4588ec20
JB
4916 return pause;
4917}
4918
4588ec20 4919
5f5c8ee5 4920/* Do line insertions/deletions on frame F for frame-based redisplay. */
4588ec20 4921
dfcf069d 4922int
971de7fb 4923scrolling (struct frame *frame)
4588ec20
JB
4924{
4925 int unchanged_at_top, unchanged_at_bottom;
4926 int window_size;
4927 int changed_lines;
7df02016
KS
4928 int *old_hash = (int *) alloca (FRAME_LINES (frame) * sizeof (int));
4929 int *new_hash = (int *) alloca (FRAME_LINES (frame) * sizeof (int));
4930 int *draw_cost = (int *) alloca (FRAME_LINES (frame) * sizeof (int));
4931 int *old_draw_cost = (int *) alloca (FRAME_LINES (frame) * sizeof (int));
4588ec20 4932 register int i;
7df02016 4933 int free_at_end_vpos = FRAME_LINES (frame);
5f5c8ee5
GM
4934 struct glyph_matrix *current_matrix = frame->current_matrix;
4935 struct glyph_matrix *desired_matrix = frame->desired_matrix;
4588ec20 4936
5f5c8ee5
GM
4937 if (!current_matrix)
4938 abort ();
4588ec20 4939
5f5c8ee5
GM
4940 /* Compute hash codes of all the lines. Also calculate number of
4941 changed lines, number of unchanged lines at the beginning, and
4942 number of unchanged lines at the end. */
4588ec20
JB
4943 changed_lines = 0;
4944 unchanged_at_top = 0;
7df02016
KS
4945 unchanged_at_bottom = FRAME_LINES (frame);
4946 for (i = 0; i < FRAME_LINES (frame); i++)
4588ec20
JB
4947 {
4948 /* Give up on this scrolling if some old lines are not enabled. */
5f5c8ee5 4949 if (!MATRIX_ROW_ENABLED_P (current_matrix, i))
4588ec20 4950 return 0;
5f5c8ee5
GM
4951 old_hash[i] = line_hash_code (MATRIX_ROW (current_matrix, i));
4952 if (! MATRIX_ROW_ENABLED_P (desired_matrix, i))
f188b3c4
RS
4953 {
4954 /* This line cannot be redrawn, so don't let scrolling mess it. */
4955 new_hash[i] = old_hash[i];
4956#define INFINITY 1000000 /* Taken from scroll.c */
4957 draw_cost[i] = INFINITY;
4958 }
4588ec20 4959 else
f188b3c4 4960 {
5f5c8ee5
GM
4961 new_hash[i] = line_hash_code (MATRIX_ROW (desired_matrix, i));
4962 draw_cost[i] = line_draw_cost (desired_matrix, i);
f188b3c4 4963 }
4588ec20
JB
4964
4965 if (old_hash[i] != new_hash[i])
4966 {
4967 changed_lines++;
7df02016 4968 unchanged_at_bottom = FRAME_LINES (frame) - i - 1;
4588ec20
JB
4969 }
4970 else if (i == unchanged_at_top)
4971 unchanged_at_top++;
5f5c8ee5 4972 old_draw_cost[i] = line_draw_cost (current_matrix, i);
4588ec20
JB
4973 }
4974
4975 /* If changed lines are few, don't allow preemption, don't scroll. */
daf01701 4976 if ((!FRAME_SCROLL_REGION_OK (frame)
8a56675d 4977 && changed_lines < baud_rate / 2400)
7df02016 4978 || unchanged_at_bottom == FRAME_LINES (frame))
4588ec20
JB
4979 return 1;
4980
7df02016 4981 window_size = (FRAME_LINES (frame) - unchanged_at_top
4588ec20
JB
4982 - unchanged_at_bottom);
4983
daf01701 4984 if (FRAME_SCROLL_REGION_OK (frame))
4588ec20 4985 free_at_end_vpos -= unchanged_at_bottom;
daf01701 4986 else if (FRAME_MEMORY_BELOW_FRAME (frame))
4588ec20
JB
4987 free_at_end_vpos = -1;
4988
4989 /* If large window, fast terminal and few lines in common between
5f5c8ee5 4990 current frame and desired frame, don't bother with i/d calc. */
daf01701 4991 if (!FRAME_SCROLL_REGION_OK (frame)
8a56675d 4992 && window_size >= 18 && baud_rate > 2400
4588ec20
JB
4993 && (window_size >=
4994 10 * scrolling_max_lines_saved (unchanged_at_top,
7df02016 4995 FRAME_LINES (frame) - unchanged_at_bottom,
4588ec20
JB
4996 old_hash, new_hash, draw_cost)))
4997 return 0;
4998
5f5c8ee5
GM
4999 if (window_size < 2)
5000 return 0;
5001
502b9b64 5002 scrolling_1 (frame, window_size, unchanged_at_top, unchanged_at_bottom,
4588ec20 5003 draw_cost + unchanged_at_top - 1,
190bb91a 5004 old_draw_cost + unchanged_at_top - 1,
4588ec20
JB
5005 old_hash + unchanged_at_top - 1,
5006 new_hash + unchanged_at_top - 1,
5007 free_at_end_vpos - unchanged_at_top);
5008
5009 return 0;
5010}
4588ec20 5011
4588ec20 5012
5f5c8ee5
GM
5013/* Count the number of blanks at the start of the vector of glyphs R
5014 which is LEN glyphs long. */
4588ec20 5015
4588ec20 5016static int
971de7fb 5017count_blanks (struct glyph *r, int len)
4588ec20 5018{
5f5c8ee5 5019 int i;
177c0ea7 5020
5f5c8ee5
GM
5021 for (i = 0; i < len; ++i)
5022 if (!CHAR_GLYPH_SPACE_P (r[i]))
5023 break;
5024
5025 return i;
4588ec20
JB
5026}
5027
5f5c8ee5
GM
5028
5029/* Count the number of glyphs in common at the start of the glyph
5030 vectors STR1 and STR2. END1 is the end of STR1 and END2 is the end
5031 of STR2. Value is the number of equal glyphs equal at the start. */
5032
4588ec20 5033static int
971de7fb 5034count_match (struct glyph *str1, struct glyph *end1, struct glyph *str2, struct glyph *end2)
4588ec20 5035{
5f5c8ee5
GM
5036 struct glyph *p1 = str1;
5037 struct glyph *p2 = str2;
177c0ea7 5038
5f5c8ee5
GM
5039 while (p1 < end1
5040 && p2 < end2
42186983 5041 && GLYPH_CHAR_AND_FACE_EQUAL_P (p1, p2))
5f5c8ee5 5042 ++p1, ++p2;
177c0ea7 5043
5f5c8ee5 5044 return p1 - str1;
4588ec20
JB
5045}
5046
5f5c8ee5 5047
4588ec20 5048/* Char insertion/deletion cost vector, from term.c */
4588ec20 5049
5f5c8ee5 5050extern int *char_ins_del_vector;
7df02016 5051#define char_ins_del_cost(f) (&char_ins_del_vector[FRAME_TOTAL_COLS((f))])
4588ec20 5052
5f5c8ee5
GM
5053
5054/* Perform a frame-based update on line VPOS in frame FRAME. */
5055
4588ec20 5056static void
971de7fb 5057update_frame_line (struct frame *f, int vpos)
4588ec20 5058{
5f5c8ee5 5059 struct glyph *obody, *nbody, *op1, *op2, *np1, *nend;
4588ec20
JB
5060 int tem;
5061 int osp, nsp, begmatch, endmatch, olen, nlen;
c363a1d6
GM
5062 struct glyph_matrix *current_matrix = f->current_matrix;
5063 struct glyph_matrix *desired_matrix = f->desired_matrix;
5f5c8ee5
GM
5064 struct glyph_row *current_row = MATRIX_ROW (current_matrix, vpos);
5065 struct glyph_row *desired_row = MATRIX_ROW (desired_matrix, vpos);
5066 int must_write_whole_line_p;
daf01701 5067 int write_spaces_p = FRAME_MUST_WRITE_SPACES (f);
c363a1d6 5068 int colored_spaces_p = (FACE_FROM_ID (f, DEFAULT_FACE_ID)->background
0a894bad
GM
5069 != FACE_TTY_DEFAULT_BG_COLOR);
5070
5071 if (colored_spaces_p)
5072 write_spaces_p = 1;
5f5c8ee5 5073
26c63686
GM
5074 /* Current row not enabled means it has unknown contents. We must
5075 write the whole desired line in that case. */
5f5c8ee5
GM
5076 must_write_whole_line_p = !current_row->enabled_p;
5077 if (must_write_whole_line_p)
4588ec20 5078 {
5f5c8ee5 5079 obody = 0;
4588ec20
JB
5080 olen = 0;
5081 }
5082 else
5083 {
5f5c8ee5
GM
5084 obody = MATRIX_ROW_GLYPH_START (current_matrix, vpos);
5085 olen = current_row->used[TEXT_AREA];
177c0ea7 5086
4cecaab8
MB
5087 /* Ignore trailing spaces, if we can. */
5088 if (!write_spaces_p)
5089 while (olen > 0 && CHAR_GLYPH_SPACE_P (obody[olen-1]))
5090 olen--;
4588ec20
JB
5091 }
5092
5f5c8ee5
GM
5093 current_row->enabled_p = 1;
5094 current_row->used[TEXT_AREA] = desired_row->used[TEXT_AREA];
4588ec20 5095
5f5c8ee5
GM
5096 /* If desired line is empty, just clear the line. */
5097 if (!desired_row->enabled_p)
4588ec20
JB
5098 {
5099 nlen = 0;
5100 goto just_erase;
5101 }
5102
5f5c8ee5
GM
5103 nbody = desired_row->glyphs[TEXT_AREA];
5104 nlen = desired_row->used[TEXT_AREA];
5105 nend = nbody + nlen;
5106
5107 /* If display line has unknown contents, write the whole line. */
5108 if (must_write_whole_line_p)
5109 {
26c63686 5110 /* Ignore spaces at the end, if we can. */
0a894bad 5111 if (!write_spaces_p)
74ca462f
GM
5112 while (nlen > 0 && CHAR_GLYPH_SPACE_P (nbody[nlen - 1]))
5113 --nlen;
5114
26c63686 5115 /* Write the contents of the desired line. */
74ca462f 5116 if (nlen)
26c63686 5117 {
385ed61f
KL
5118 cursor_to (f, vpos, 0);
5119 write_glyphs (f, nbody, nlen);
26c63686 5120 }
177c0ea7 5121
26c63686
GM
5122 /* Don't call clear_end_of_line if we already wrote the whole
5123 line. The cursor will not be at the right margin in that
5124 case but in the line below. */
7df02016 5125 if (nlen < FRAME_TOTAL_COLS (f))
26c63686 5126 {
385ed61f
KL
5127 cursor_to (f, vpos, nlen);
5128 clear_end_of_line (f, FRAME_TOTAL_COLS (f));
26c63686 5129 }
58827478
GM
5130 else
5131 /* Make sure we are in the right row, otherwise cursor movement
5132 with cmgoto might use `ch' in the wrong row. */
385ed61f 5133 cursor_to (f, vpos, 0);
177c0ea7 5134
5f5c8ee5
GM
5135 make_current (desired_matrix, current_matrix, vpos);
5136 return;
5137 }
4588ec20
JB
5138
5139 /* Pretend trailing spaces are not there at all,
5140 unless for one reason or another we must write all spaces. */
4cecaab8
MB
5141 if (!write_spaces_p)
5142 while (nlen > 0 && CHAR_GLYPH_SPACE_P (nbody[nlen - 1]))
5143 nlen--;
4588ec20
JB
5144
5145 /* If there's no i/d char, quickly do the best we can without it. */
daf01701 5146 if (!FRAME_CHAR_INS_DEL_OK (f))
4588ec20 5147 {
5f5c8ee5 5148 int i, j;
4588ec20 5149
5f5c8ee5
GM
5150 /* Find the first glyph in desired row that doesn't agree with
5151 a glyph in the current row, and write the rest from there on. */
4588ec20
JB
5152 for (i = 0; i < nlen; i++)
5153 {
5f5c8ee5 5154 if (i >= olen || !GLYPH_EQUAL_P (nbody + i, obody + i))
4588ec20 5155 {
5f5c8ee5
GM
5156 /* Find the end of the run of different glyphs. */
5157 j = i + 1;
5158 while (j < nlen
5159 && (j >= olen
5160 || !GLYPH_EQUAL_P (nbody + j, obody + j)
5161 || CHAR_GLYPH_PADDING_P (nbody[j])))
5162 ++j;
177c0ea7
JB
5163
5164 /* Output this run of non-matching chars. */
385ed61f
KL
5165 cursor_to (f, vpos, i);
5166 write_glyphs (f, nbody + i, j - i);
5f5c8ee5 5167 i = j - 1;
4588ec20
JB
5168
5169 /* Now find the next non-match. */
5170 }
5171 }
5172
5173 /* Clear the rest of the line, or the non-clear part of it. */
5174 if (olen > nlen)
5175 {
385ed61f
KL
5176 cursor_to (f, vpos, nlen);
5177 clear_end_of_line (f, olen);
4588ec20
JB
5178 }
5179
5f5c8ee5
GM
5180 /* Make current row = desired row. */
5181 make_current (desired_matrix, current_matrix, vpos);
4588ec20
JB
5182 return;
5183 }
5184
5f5c8ee5
GM
5185 /* Here when CHAR_INS_DEL_OK != 0, i.e. we can insert or delete
5186 characters in a row. */
5187
4588ec20
JB
5188 if (!olen)
5189 {
5f5c8ee5
GM
5190 /* If current line is blank, skip over initial spaces, if
5191 possible, and write the rest. */
4cecaab8 5192 if (write_spaces_p)
5f5c8ee5
GM
5193 nsp = 0;
5194 else
5195 nsp = count_blanks (nbody, nlen);
5196
4588ec20
JB
5197 if (nlen > nsp)
5198 {
385ed61f
KL
5199 cursor_to (f, vpos, nsp);
5200 write_glyphs (f, nbody + nsp, nlen - nsp);
4588ec20
JB
5201 }
5202
502b9b64 5203 /* Exchange contents between current_frame and new_frame. */
5f5c8ee5 5204 make_current (desired_matrix, current_matrix, vpos);
4588ec20
JB
5205 return;
5206 }
5207
4588ec20 5208 /* Compute number of leading blanks in old and new contents. */
5f5c8ee5 5209 osp = count_blanks (obody, olen);
4cecaab8 5210 nsp = (colored_spaces_p ? 0 : count_blanks (nbody, nlen));
4588ec20 5211
5f5c8ee5
GM
5212 /* Compute number of matching chars starting with first non-blank. */
5213 begmatch = count_match (obody + osp, obody + olen,
5214 nbody + nsp, nbody + nlen);
4588ec20
JB
5215
5216 /* Spaces in new match implicit space past the end of old. */
5217 /* A bug causing this to be a no-op was fixed in 18.29. */
0a894bad 5218 if (!write_spaces_p && osp + begmatch == olen)
4588ec20
JB
5219 {
5220 np1 = nbody + nsp;
5f5c8ee5
GM
5221 while (np1 + begmatch < nend && CHAR_GLYPH_SPACE_P (np1[begmatch]))
5222 ++begmatch;
4588ec20
JB
5223 }
5224
5225 /* Avoid doing insert/delete char
5226 just cause number of leading spaces differs
5f5c8ee5 5227 when the following text does not match. */
4588ec20
JB
5228 if (begmatch == 0 && osp != nsp)
5229 osp = nsp = min (osp, nsp);
5230
5231 /* Find matching characters at end of line */
5232 op1 = obody + olen;
5233 np1 = nbody + nlen;
5234 op2 = op1 + begmatch - min (olen - osp, nlen - nsp);
5f5c8ee5
GM
5235 while (op1 > op2
5236 && GLYPH_EQUAL_P (op1 - 1, np1 - 1))
4588ec20
JB
5237 {
5238 op1--;
5239 np1--;
5240 }
5241 endmatch = obody + olen - op1;
5242
4588ec20
JB
5243 /* tem gets the distance to insert or delete.
5244 endmatch is how many characters we save by doing so.
5245 Is it worth it? */
5246
5247 tem = (nlen - nsp) - (olen - osp);
5248 if (endmatch && tem
daf01701 5249 && (!FRAME_CHAR_INS_DEL_OK (f)
8a56675d 5250 || endmatch <= char_ins_del_cost (f)[tem]))
4588ec20
JB
5251 endmatch = 0;
5252
5253 /* nsp - osp is the distance to insert or delete.
5254 If that is nonzero, begmatch is known to be nonzero also.
5255 begmatch + endmatch is how much we save by doing the ins/del.
5256 Is it worth it? */
5257
5258 if (nsp != osp
daf01701 5259 && (!FRAME_CHAR_INS_DEL_OK (f)
c363a1d6 5260 || begmatch + endmatch <= char_ins_del_cost (f)[nsp - osp]))
4588ec20
JB
5261 {
5262 begmatch = 0;
5263 endmatch = 0;
5264 osp = nsp = min (osp, nsp);
5265 }
5266
5267 /* Now go through the line, inserting, writing and
5268 deleting as appropriate. */
5269
5270 if (osp > nsp)
5271 {
385ed61f
KL
5272 cursor_to (f, vpos, nsp);
5273 delete_glyphs (f, osp - nsp);
4588ec20
JB
5274 }
5275 else if (nsp > osp)
5276 {
5277 /* If going to delete chars later in line
5278 and insert earlier in the line,
5279 must delete first to avoid losing data in the insert */
5280 if (endmatch && nlen < olen + nsp - osp)
5281 {
385ed61f
KL
5282 cursor_to (f, vpos, nlen - endmatch + osp - nsp);
5283 delete_glyphs (f, olen + nsp - osp - nlen);
4588ec20
JB
5284 olen = nlen - (nsp - osp);
5285 }
385ed61f
KL
5286 cursor_to (f, vpos, osp);
5287 insert_glyphs (f, 0, nsp - osp);
4588ec20
JB
5288 }
5289 olen += nsp - osp;
5290
5291 tem = nsp + begmatch + endmatch;
5292 if (nlen != tem || olen != tem)
5293 {
4588ec20
JB
5294 if (!endmatch || nlen == olen)
5295 {
c363a1d6
GM
5296 /* If new text being written reaches right margin, there is
5297 no need to do clear-to-eol at the end of this function
5298 (and it would not be safe, since cursor is not going to
5299 be "at the margin" after the text is done). */
7df02016 5300 if (nlen == FRAME_TOTAL_COLS (f))
4588ec20 5301 olen = 0;
c363a1d6
GM
5302
5303 /* Function write_glyphs is prepared to do nothing
5304 if passed a length <= 0. Check it here to avoid
5305 unnecessary cursor movement. */
5306 if (nlen - tem > 0)
5307 {
385ed61f
KL
5308 cursor_to (f, vpos, nsp + begmatch);
5309 write_glyphs (f, nbody + nsp + begmatch, nlen - tem);
c363a1d6 5310 }
4588ec20
JB
5311 }
5312 else if (nlen > olen)
5313 {
24e86043
KH
5314 /* Here, we used to have the following simple code:
5315 ----------------------------------------
5316 write_glyphs (nbody + nsp + begmatch, olen - tem);
5317 insert_glyphs (nbody + nsp + begmatch + olen - tem, nlen - olen);
5318 ----------------------------------------
5319 but it doesn't work if nbody[nsp + begmatch + olen - tem]
5320 is a padding glyph. */
5321 int out = olen - tem; /* Columns to be overwritten originally. */
5322 int del;
5f5c8ee5 5323
385ed61f 5324 cursor_to (f, vpos, nsp + begmatch);
177c0ea7 5325
5f5c8ee5 5326 /* Calculate columns we can actually overwrite. */
c363a1d6
GM
5327 while (CHAR_GLYPH_PADDING_P (nbody[nsp + begmatch + out]))
5328 out--;
385ed61f 5329 write_glyphs (f, nbody + nsp + begmatch, out);
177c0ea7 5330
5f5c8ee5
GM
5331 /* If we left columns to be overwritten, we must delete them. */
5332 del = olen - tem - out;
c363a1d6 5333 if (del > 0)
385ed61f 5334 delete_glyphs (f, del);
177c0ea7 5335
5f5c8ee5 5336 /* At last, we insert columns not yet written out. */
385ed61f 5337 insert_glyphs (f, nbody + nsp + begmatch + out, nlen - olen + del);
5f5c8ee5
GM
5338 olen = nlen;
5339 }
5340 else if (olen > nlen)
5341 {
385ed61f
KL
5342 cursor_to (f, vpos, nsp + begmatch);
5343 write_glyphs (f, nbody + nsp + begmatch, nlen - tem);
5344 delete_glyphs (f, olen - nlen);
5f5c8ee5
GM
5345 olen = nlen;
5346 }
bd9e3e75 5347 }
5f5c8ee5
GM
5348
5349 just_erase:
5350 /* If any unerased characters remain after the new line, erase them. */
5351 if (olen > nlen)
078b3696 5352 {
385ed61f
KL
5353 cursor_to (f, vpos, nlen);
5354 clear_end_of_line (f, olen);
078b3696 5355 }
5f5c8ee5
GM
5356
5357 /* Exchange contents between current_frame and new_frame. */
5358 make_current (desired_matrix, current_matrix, vpos);
078b3696 5359}
5f5c8ee5
GM
5360
5361
078b3696 5362\f
5f5c8ee5
GM
5363/***********************************************************************
5364 X/Y Position -> Buffer Position
5365 ***********************************************************************/
5366
a1b0a6db 5367/* Determine what's under window-relative pixel position (*X, *Y).
6b61353c
KH
5368 Return the object (string or buffer) that's there.
5369 Return in *POS the position in that object.
5370 Adjust *X and *Y to character positions. */
5f5c8ee5 5371
6b61353c 5372Lisp_Object
971de7fb 5373buffer_posn_from_coords (struct window *w, int *x, int *y, struct display_pos *pos, Lisp_Object *object, int *dx, int *dy, int *width, int *height)
4588ec20 5374{
5f5c8ee5 5375 struct it it;
707ea971 5376 Lisp_Object old_current_buffer = Fcurrent_buffer ();
5f5c8ee5 5377 struct text_pos startp;
6b61353c
KH
5378 Lisp_Object string;
5379 struct glyph_row *row;
cedd7cd9
KS
5380#ifdef HAVE_WINDOW_SYSTEM
5381 struct image *img = 0;
5382#endif
6b61353c 5383 int x0, x1;
5f5c8ee5 5384
707ea971
CY
5385 /* We used to set current_buffer directly here, but that does the
5386 wrong thing with `face-remapping-alist' (bug#2044). */
5387 Fset_buffer (w->buffer);
5f5c8ee5
GM
5388 SET_TEXT_POS_FROM_MARKER (startp, w->start);
5389 CHARPOS (startp) = min (ZV, max (BEGV, CHARPOS (startp)));
5390 BYTEPOS (startp) = min (ZV_BYTE, max (BEGV_BYTE, BYTEPOS (startp)));
5391 start_display (&it, w, startp);
177c0ea7 5392
6b61353c
KH
5393 x0 = *x - WINDOW_LEFT_MARGIN_WIDTH (w);
5394 move_it_to (&it, -1, x0 + it.first_visible_x, *y, -1,
5f5c8ee5 5395 MOVE_TO_X | MOVE_TO_Y);
177c0ea7 5396
707ea971 5397 Fset_buffer (old_current_buffer);
a1b0a6db 5398
6b61353c
KH
5399 *dx = x0 + it.first_visible_x - it.current_x;
5400 *dy = *y - it.current_y;
5401
5402 string = w->buffer;
5403 if (STRINGP (it.string))
5404 string = it.string;
a1b0a6db 5405 *pos = it.current;
6b61353c
KH
5406
5407#ifdef HAVE_WINDOW_SYSTEM
5408 if (it.what == IT_IMAGE)
5409 {
6b61353c
KH
5410 if ((img = IMAGE_FROM_ID (it.f, it.image_id)) != NULL
5411 && !NILP (img->spec))
5412 *object = img->spec;
5413 }
5414#endif
5415
b70d98e1
KS
5416 if (it.vpos < w->current_matrix->nrows
5417 && (row = MATRIX_ROW (w->current_matrix, it.vpos),
5418 row->enabled_p))
6b61353c
KH
5419 {
5420 if (it.hpos < row->used[TEXT_AREA])
5421 {
5422 struct glyph *glyph = row->glyphs[TEXT_AREA] + it.hpos;
6b61353c 5423#ifdef HAVE_WINDOW_SYSTEM
cedd7cd9
KS
5424 if (img)
5425 {
5426 *dy -= row->ascent - glyph->ascent;
5427 *dx += glyph->slice.x;
5428 *dy += glyph->slice.y;
5429 /* Image slices positions are still relative to the entire image */
5430 *width = img->width;
5431 *height = img->height;
5432 }
5433 else
6b61353c 5434#endif
cedd7cd9
KS
5435 {
5436 *width = glyph->pixel_width;
5437 *height = glyph->ascent + glyph->descent;
5438 }
6b61353c
KH
5439 }
5440 else
5441 {
5442 *width = 0;
5443 *height = row->height;
5444 }
5445 }
5446 else
5447 {
5448 *width = *height = 0;
5449 }
5450
5451 /* Add extra (default width) columns if clicked after EOL. */
5452 x1 = max(0, it.current_x + it.pixel_width - it.first_visible_x);
5453 if (x0 > x1)
5454 it.hpos += (x0 - x1) / WINDOW_FRAME_COLUMN_WIDTH (w);
5455
5456 *x = it.hpos;
5457 *y = it.vpos;
5458
5459 return string;
5f5c8ee5 5460}
4588ec20 5461
5f5c8ee5
GM
5462
5463/* Value is the string under window-relative coordinates X/Y in the
6b61353c
KH
5464 mode line or header line (PART says which) of window W, or nil if none.
5465 *CHARPOS is set to the position in the string returned. */
5f5c8ee5
GM
5466
5467Lisp_Object
971de7fb 5468mode_line_string (struct window *w, enum window_part part, int *x, int *y, int *charpos, Lisp_Object *object, int *dx, int *dy, int *width, int *height)
5f5c8ee5
GM
5469{
5470 struct glyph_row *row;
5471 struct glyph *glyph, *end;
6b61353c 5472 int x0, y0;
5f5c8ee5
GM
5473 Lisp_Object string = Qnil;
5474
641bdbf3 5475 if (part == ON_MODE_LINE)
5f5c8ee5
GM
5476 row = MATRIX_MODE_LINE_ROW (w->current_matrix);
5477 else
045dee35 5478 row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
6b61353c
KH
5479 y0 = *y - row->y;
5480 *y = row - MATRIX_FIRST_TEXT_ROW (w->current_matrix);
5f5c8ee5
GM
5481
5482 if (row->mode_line_p && row->enabled_p)
4588ec20 5483 {
5f5c8ee5
GM
5484 /* Find the glyph under X. If we find one with a string object,
5485 it's the one we were looking for. */
5486 glyph = row->glyphs[TEXT_AREA];
5487 end = glyph + row->used[TEXT_AREA];
cfde341f 5488 for (x0 = *x; glyph < end && x0 >= glyph->pixel_width; ++glyph)
6b61353c
KH
5489 x0 -= glyph->pixel_width;
5490 *x = glyph - row->glyphs[TEXT_AREA];
5491 if (glyph < end)
5492 {
5493 string = glyph->object;
5494 *charpos = glyph->charpos;
5495 *width = glyph->pixel_width;
5496 *height = glyph->ascent + glyph->descent;
5497#ifdef HAVE_WINDOW_SYSTEM
5498 if (glyph->type == IMAGE_GLYPH)
5499 {
5500 struct image *img;
5501 img = IMAGE_FROM_ID (WINDOW_XFRAME (w), glyph->u.img_id);
5502 if (img != NULL)
5503 *object = img->spec;
5504 y0 -= row->ascent - glyph->ascent;
5505 }
5506#endif
5507 }
5508 else
5509 {
5510 /* Add extra (default width) columns if clicked after EOL. */
5511 *x += x0 / WINDOW_FRAME_COLUMN_WIDTH (w);
5512 *width = 0;
5513 *height = row->height;
5514 }
5515 }
5516 else
5517 {
5518 *x = 0;
5519 x0 = 0;
5520 *width = *height = 0;
4588ec20 5521 }
5f5c8ee5 5522
6b61353c
KH
5523 *dx = x0;
5524 *dy = y0;
5525
5f5c8ee5 5526 return string;
4588ec20 5527}
5f5c8ee5
GM
5528
5529
db1db309
GM
5530/* Value is the string under window-relative coordinates X/Y in either
5531 marginal area, or nil if none. *CHARPOS is set to the position in
5532 the string returned. */
5533
5534Lisp_Object
971de7fb 5535marginal_area_string (struct window *w, enum window_part part, int *x, int *y, int *charpos, Lisp_Object *object, int *dx, int *dy, int *width, int *height)
db1db309
GM
5536{
5537 struct glyph_row *row = w->current_matrix->rows;
5538 struct glyph *glyph, *end;
6b61353c 5539 int x0, y0, i, wy = *y;
641bdbf3 5540 int area;
db1db309
GM
5541 Lisp_Object string = Qnil;
5542
641bdbf3 5543 if (part == ON_LEFT_MARGIN)
db1db309 5544 area = LEFT_MARGIN_AREA;
641bdbf3 5545 else if (part == ON_RIGHT_MARGIN)
db1db309
GM
5546 area = RIGHT_MARGIN_AREA;
5547 else
5548 abort ();
5549
5550 for (i = 0; row->enabled_p && i < w->current_matrix->nrows; ++i, ++row)
5551 if (wy >= row->y && wy < MATRIX_ROW_BOTTOM_Y (row))
5552 break;
6b61353c
KH
5553 y0 = *y - row->y;
5554 *y = row - MATRIX_FIRST_TEXT_ROW (w->current_matrix);
db1db309
GM
5555
5556 if (row->enabled_p)
5557 {
5558 /* Find the glyph under X. If we find one with a string object,
5559 it's the one we were looking for. */
db1db309 5560 if (area == RIGHT_MARGIN_AREA)
7df02016 5561 x0 = ((WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
6b61353c 5562 ? WINDOW_LEFT_FRINGE_WIDTH (w)
7df02016
KS
5563 : WINDOW_TOTAL_FRINGE_WIDTH (w))
5564 + window_box_width (w, LEFT_MARGIN_AREA)
5565 + window_box_width (w, TEXT_AREA));
db1db309 5566 else
7df02016 5567 x0 = (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
6b61353c 5568 ? WINDOW_LEFT_FRINGE_WIDTH (w)
7df02016
KS
5569 : 0);
5570
6b61353c
KH
5571 glyph = row->glyphs[area];
5572 end = glyph + row->used[area];
cfde341f 5573 for (x0 = *x - x0; glyph < end && x0 >= glyph->pixel_width; ++glyph)
6b61353c
KH
5574 x0 -= glyph->pixel_width;
5575 *x = glyph - row->glyphs[area];
5576 if (glyph < end)
5577 {
5578 string = glyph->object;
5579 *charpos = glyph->charpos;
5580 *width = glyph->pixel_width;
5581 *height = glyph->ascent + glyph->descent;
5582#ifdef HAVE_WINDOW_SYSTEM
5583 if (glyph->type == IMAGE_GLYPH)
5584 {
5585 struct image *img;
5586 img = IMAGE_FROM_ID (WINDOW_XFRAME (w), glyph->u.img_id);
5587 if (img != NULL)
5588 *object = img->spec;
5589 y0 -= row->ascent - glyph->ascent;
cedd7cd9
KS
5590 x0 += glyph->slice.x;
5591 y0 += glyph->slice.y;
6b61353c
KH
5592 }
5593#endif
5594 }
5595 else
5596 {
5597 /* Add extra (default width) columns if clicked after EOL. */
5598 *x += x0 / WINDOW_FRAME_COLUMN_WIDTH (w);
5599 *width = 0;
5600 *height = row->height;
5601 }
db1db309 5602 }
6b61353c
KH
5603 else
5604 {
5605 x0 = 0;
5606 *x = 0;
5607 *width = *height = 0;
5608 }
5609
5610 *dx = x0;
5611 *dy = y0;
db1db309
GM
5612
5613 return string;
5614}
5615
5616
5f5c8ee5
GM
5617/***********************************************************************
5618 Changing Frame Sizes
5619 ***********************************************************************/
4588ec20
JB
5620
5621#ifdef SIGWINCH
5f5c8ee5 5622
efb859b4 5623SIGTYPE
971de7fb
DN
5624window_change_signal (int signalnum) /* If we don't have an argument, */
5625 /* some compilers complain in signal calls. */
4588ec20
JB
5626{
5627 int width, height;
4588ec20
JB
5628 int old_errno = errno;
5629
28d7d09f 5630 struct tty_display_info *tty;
4d553a13 5631
333f1b6f
JD
5632 signal (SIGWINCH, window_change_signal);
5633 SIGNAL_THREAD_CHECK (signalnum);
5634
9628b887
KL
5635 /* The frame size change obviously applies to a single
5636 termcap-controlled terminal, but we can't decide which.
5637 Therefore, we resize the frames corresponding to each tty.
9628b887
KL
5638 */
5639 for (tty = tty_list; tty; tty = tty->next) {
4588ec20 5640
0a125897
KL
5641 if (! tty->term_initted)
5642 continue;
4588ec20 5643
db878925
DN
5644 /* Suspended tty frames have tty->input == NULL avoid trying to
5645 use it. */
5646 if (!tty->input)
5647 continue;
5648
0b0d3e0b 5649 get_tty_size (fileno (tty->input), &width, &height);
3fc809e2 5650
bedeffcf 5651 if (width > 5 && height > 2) {
9628b887 5652 Lisp_Object tail, frame;
3fc809e2 5653
9628b887 5654 FOR_EACH_FRAME (tail, frame)
4d553a13
KL
5655 if (FRAME_TERMCAP_P (XFRAME (frame)) && FRAME_TTY (XFRAME (frame)) == tty)
5656 /* Record the new sizes, but don't reallocate the data
5657 structures now. Let that be done later outside of the
5658 signal handler. */
5659 change_frame_size (XFRAME (frame), height, width, 0, 1, 0);
9628b887 5660 }
4588ec20 5661 }
3fc809e2 5662
4588ec20
JB
5663 errno = old_errno;
5664}
5665#endif /* SIGWINCH */
5666
5667
b96fd3e8
GM
5668/* Do any change in frame size that was requested by a signal. SAFE
5669 non-zero means this function is called from a place where it is
5670 safe to change frame sizes while a redisplay is in progress. */
4588ec20 5671
dfcf069d 5672void
971de7fb 5673do_pending_window_change (int safe)
4588ec20
JB
5674{
5675 /* If window_change_signal should have run before, run it now. */
b96fd3e8
GM
5676 if (redisplaying_p && !safe)
5677 return;
177c0ea7 5678
4588ec20
JB
5679 while (delayed_size_change)
5680 {
35f56f96 5681 Lisp_Object tail, frame;
4588ec20
JB
5682
5683 delayed_size_change = 0;
5684
35f56f96 5685 FOR_EACH_FRAME (tail, frame)
4588ec20 5686 {
5f5c8ee5 5687 struct frame *f = XFRAME (frame);
35f56f96 5688
7df02016
KS
5689 if (f->new_text_lines != 0 || f->new_text_cols != 0)
5690 change_frame_size (f, f->new_text_lines, f->new_text_cols,
5691 0, 0, safe);
4588ec20
JB
5692 }
5693 }
5694}
5695
5696
502b9b64 5697/* Change the frame height and/or width. Values may be given as zero to
177c0ea7 5698 indicate no change is to take place.
4588ec20 5699
b6a65ac2
JB
5700 If DELAY is non-zero, then assume we're being called from a signal
5701 handler, and queue the change for later - perhaps the next
5702 redisplay. Since this tries to resize windows, we can't call it
b96fd3e8
GM
5703 from a signal handler.
5704
5705 SAFE non-zero means this function is called from a place where it's
5706 safe to change frame sizes while a redisplay is in progress. */
b6a65ac2 5707
dfcf069d 5708void
971de7fb 5709change_frame_size (register struct frame *f, int newheight, int newwidth, int pretend, int delay, int safe)
45140e01
RS
5710{
5711 Lisp_Object tail, frame;
3826ea1a 5712
9628b887 5713 if (FRAME_MSDOS_P (f))
45140e01 5714 {
9628b887
KL
5715 /* On MS-DOS, all frames use the same screen, so a change in
5716 size affects all frames. Termcap now supports multiple
5717 ttys. */
45140e01 5718 FOR_EACH_FRAME (tail, frame)
8a376b3b 5719 if (! FRAME_WINDOW_P (XFRAME (frame)))
45140e01 5720 change_frame_size_1 (XFRAME (frame), newheight, newwidth,
b96fd3e8 5721 pretend, delay, safe);
45140e01
RS
5722 }
5723 else
b96fd3e8 5724 change_frame_size_1 (f, newheight, newwidth, pretend, delay, safe);
45140e01
RS
5725}
5726
5727static void
971de7fb 5728change_frame_size_1 (register struct frame *f, int newheight, int newwidth, int pretend, int delay, int safe)
4588ec20 5729{
7df02016 5730 int new_frame_total_cols;
aed13378 5731 int count = SPECPDL_INDEX ();
3826ea1a 5732
4588ec20 5733 /* If we can't deal with the change now, queue it for later. */
b96fd3e8 5734 if (delay || (redisplaying_p && !safe))
4588ec20 5735 {
7df02016
KS
5736 f->new_text_lines = newheight;
5737 f->new_text_cols = newwidth;
4588ec20
JB
5738 delayed_size_change = 1;
5739 return;
5740 }
5741
502b9b64 5742 /* This size-change overrides any pending one for this frame. */
7df02016
KS
5743 f->new_text_lines = 0;
5744 f->new_text_cols = 0;
b6a65ac2 5745
08f7aa3e 5746 /* If an argument is zero, set it to the current value. */
ae19c6f2 5747 if (newheight == 0)
7df02016 5748 newheight = FRAME_LINES (f);
ae19c6f2 5749 if (newwidth == 0)
7df02016 5750 newwidth = FRAME_COLS (f);
3826ea1a 5751
5f5c8ee5
GM
5752 /* Compute width of windows in F.
5753 This is the width of the frame without vertical scroll bars. */
7df02016 5754 new_frame_total_cols = FRAME_TOTAL_COLS_ARG (f, newwidth);
3826ea1a 5755
b6a65ac2 5756 /* Round up to the smallest acceptable size. */
5f5c8ee5 5757 check_frame_size (f, &newheight, &newwidth);
b6a65ac2
JB
5758
5759 /* If we're not changing the frame size, quit now. */
5075d853
JD
5760 /* Frame width may be unchanged but the text portion may change, for example,
5761 fullscreen and remove/add scroll bar. */
7df02016 5762 if (newheight == FRAME_LINES (f)
5075d853
JD
5763 && newwidth == FRAME_COLS (f) // text portion unchanged
5764 && new_frame_total_cols == FRAME_TOTAL_COLS (f)) // frame width unchanged
4588ec20
JB
5765 return;
5766
cbb95688
RS
5767 BLOCK_INPUT;
5768
886a8a6c
KH
5769#ifdef MSDOS
5770 /* We only can set screen dimensions to certain values supported
5771 by our video hardware. Try to find the smallest size greater
5772 or equal to the requested dimensions. */
5773 dos_set_window_size (&newheight, &newwidth);
5774#endif
5775
7df02016 5776 if (newheight != FRAME_LINES (f))
4588ec20 5777 {
5f5c8ee5 5778 if (FRAME_HAS_MINIBUF_P (f) && !FRAME_MINIBUF_ONLY_P (f))
4588ec20 5779 {
5f5c8ee5 5780 /* Frame has both root and mini-buffer. */
7df02016 5781 XSETFASTINT (XWINDOW (FRAME_ROOT_WINDOW (f))->top_line,
5f5c8ee5
GM
5782 FRAME_TOP_MARGIN (f));
5783 set_window_height (FRAME_ROOT_WINDOW (f),
5784 (newheight
5785 - 1
5786 - FRAME_TOP_MARGIN (f)),
f8748f0f 5787 2);
7df02016 5788 XSETFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (f))->top_line,
a5d8b611 5789 newheight - 1);
5f5c8ee5 5790 set_window_height (FRAME_MINIBUF_WINDOW (f), 1, 0);
4588ec20
JB
5791 }
5792 else
502b9b64 5793 /* Frame has just one top-level window. */
5f5c8ee5 5794 set_window_height (FRAME_ROOT_WINDOW (f),
f8748f0f 5795 newheight - FRAME_TOP_MARGIN (f), 2);
b6a65ac2 5796
48e482e6
EZ
5797 /* MSDOS frames cannot PRETEND, as they change frame size by
5798 manipulating video hardware. */
5799 if ((FRAME_TERMCAP_P (f) && !pretend) || FRAME_MSDOS_P (f))
6548cf00 5800 FrameRows (FRAME_TTY (f)) = newheight;
4588ec20
JB
5801 }
5802
7df02016 5803 if (new_frame_total_cols != FRAME_TOTAL_COLS (f))
4588ec20 5804 {
f8748f0f 5805 set_window_width (FRAME_ROOT_WINDOW (f), new_frame_total_cols, 2);
5f5c8ee5 5806 if (FRAME_HAS_MINIBUF_P (f))
7df02016 5807 set_window_width (FRAME_MINIBUF_WINDOW (f), new_frame_total_cols, 0);
4588ec20 5808
48e482e6
EZ
5809 /* MSDOS frames cannot PRETEND, as they change frame size by
5810 manipulating video hardware. */
5811 if ((FRAME_TERMCAP_P (f) && !pretend) || FRAME_MSDOS_P (f))
6548cf00 5812 FrameCols (FRAME_TTY (f)) = newwidth;
5f5c8ee5 5813
9ea173e8 5814 if (WINDOWP (f->tool_bar_window))
7df02016 5815 XSETFASTINT (XWINDOW (f->tool_bar_window)->total_cols, newwidth);
4588ec20
JB
5816 }
5817
7df02016
KS
5818 FRAME_LINES (f) = newheight;
5819 SET_FRAME_COLS (f, newwidth);
986e61b8 5820
5f5c8ee5
GM
5821 {
5822 struct window *w = XWINDOW (FRAME_SELECTED_WINDOW (f));
5823 int text_area_x, text_area_y, text_area_width, text_area_height;
177c0ea7 5824
5f5c8ee5
GM
5825 window_box (w, TEXT_AREA, &text_area_x, &text_area_y, &text_area_width,
5826 &text_area_height);
5827 if (w->cursor.x >= text_area_x + text_area_width)
5828 w->cursor.hpos = w->cursor.x = 0;
5829 if (w->cursor.y >= text_area_y + text_area_height)
5830 w->cursor.vpos = w->cursor.y = 0;
5831 }
986e61b8 5832
5f5c8ee5 5833 adjust_glyphs (f);
5f5c8ee5 5834 calculate_costs (f);
cb02fa39
GM
5835 SET_FRAME_GARBAGED (f);
5836 f->resized_p = 1;
97cf50e7
RS
5837
5838 UNBLOCK_INPUT;
61730a69 5839
e523f7e5
RS
5840 record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
5841
ef264c42 5842 run_window_configuration_change_hook (f);
e523f7e5
RS
5843
5844 unbind_to (count, Qnil);
4588ec20 5845}
5f5c8ee5
GM
5846
5847
4588ec20 5848\f
5f5c8ee5
GM
5849/***********************************************************************
5850 Terminal Related Lisp Functions
5851 ***********************************************************************/
5852
5853DEFUN ("open-termscript", Fopen_termscript, Sopen_termscript,
228299fa 5854 1, 1, "FOpen termscript file: ",
7ee72033
MB
5855 doc: /* Start writing all terminal output to FILE as well as the terminal.
5856FILE = nil means just close any termscript file currently open. */)
5842a27b 5857 (Lisp_Object file)
5f5c8ee5 5858{
0b0d3e0b
KL
5859 struct tty_display_info *tty;
5860
7d2f1216
EZ
5861 if (! FRAME_TERMCAP_P (SELECTED_FRAME ())
5862 && ! FRAME_MSDOS_P (SELECTED_FRAME ()))
0b0d3e0b
KL
5863 error ("Current frame is not on a tty device");
5864
5865 tty = CURTTY ();
5866
5867 if (tty->termscript != 0)
e18c7093
KL
5868 {
5869 BLOCK_INPUT;
0b0d3e0b 5870 fclose (tty->termscript);
e18c7093
KL
5871 UNBLOCK_INPUT;
5872 }
0b0d3e0b 5873 tty->termscript = 0;
5f5c8ee5
GM
5874
5875 if (! NILP (file))
5876 {
5877 file = Fexpand_file_name (file, Qnil);
0b0d3e0b
KL
5878 tty->termscript = fopen (SDATA (file), "w");
5879 if (tty->termscript == 0)
5f5c8ee5
GM
5880 report_file_error ("Opening termscript", Fcons (file, Qnil));
5881 }
5882 return Qnil;
5883}
5884
5885
4588ec20 5886DEFUN ("send-string-to-terminal", Fsend_string_to_terminal,
62af879c 5887 Ssend_string_to_terminal, 1, 2, 0,
7ee72033 5888 doc: /* Send STRING to the terminal without alteration.
62af879c
KL
5889Control characters in STRING will have terminal-dependent effects.
5890
6ed8eeff 5891Optional parameter TERMINAL specifies the tty terminal device to use.
558759e4
AM
5892It may be a terminal object, a frame, or nil for the terminal used by
5893the currently selected frame. In batch mode, STRING is sent to stdout
5894when TERMINAL is nil. */)
5842a27b 5895 (Lisp_Object string, Lisp_Object terminal)
4588ec20 5896{
7cef7ce3
SM
5897 struct terminal *t = get_terminal (terminal, 1);
5898 FILE *out;
0b0d3e0b 5899
94f3db62 5900 /* ??? Perhaps we should do something special for multibyte strings here. */
b7826503 5901 CHECK_STRING (string);
2c1e4409 5902 BLOCK_INPUT;
0b0d3e0b 5903
6ed8eeff
KL
5904 if (!t)
5905 error ("Unknown terminal device");
0b0d3e0b 5906
7cef7ce3
SM
5907 if (t->type == output_initial)
5908 out = stdout;
5909 else if (t->type != output_termcap && t->type != output_msdos_raw)
5910 error ("Device %d is not a termcap terminal device", t->id);
5911 else
5912 {
5913 struct tty_display_info *tty = t->display_info.tty;
3fc809e2 5914
7cef7ce3
SM
5915 if (! tty->output)
5916 error ("Terminal is currently suspended");
cecfdea6 5917
7cef7ce3
SM
5918 if (tty->termscript)
5919 {
5920 fwrite (SDATA (string), 1, SBYTES (string), tty->termscript);
5921 fflush (tty->termscript);
5922 }
5923 out = tty->output;
4588ec20 5924 }
7cef7ce3
SM
5925 fwrite (SDATA (string), 1, SBYTES (string), out);
5926 fflush (out);
2c1e4409 5927 UNBLOCK_INPUT;
4588ec20
JB
5928 return Qnil;
5929}
5930
5f5c8ee5 5931
4588ec20 5932DEFUN ("ding", Fding, Sding, 0, 1, 0,
7ee72033 5933 doc: /* Beep, or flash the screen.
228299fa 5934Also, unless an argument is given,
7ee72033 5935terminate any keyboard macro currently executing. */)
5842a27b 5936 (Lisp_Object arg)
4588ec20 5937{
efb859b4 5938 if (!NILP (arg))
4588ec20 5939 {
7fa788da
RS
5940 if (noninteractive)
5941 putchar (07);
5942 else
385ed61f 5943 ring_bell (XFRAME (selected_frame));
4588ec20
JB
5944 }
5945 else
5946 bitch_at_user ();
5947
5948 return Qnil;
5949}
5950
dfcf069d 5951void
971de7fb 5952bitch_at_user (void)
4588ec20
JB
5953{
5954 if (noninteractive)
5955 putchar (07);
5f5c8ee5 5956 else if (!INTERACTIVE) /* Stop executing a keyboard macro. */
4588ec20
JB
5957 error ("Keyboard macro terminated by a command ringing the bell");
5958 else
385ed61f 5959 ring_bell (XFRAME (selected_frame));
4588ec20
JB
5960}
5961
5f5c8ee5
GM
5962
5963\f
5964/***********************************************************************
5965 Sleeping, Waiting
5966 ***********************************************************************/
5967
4588ec20 5968DEFUN ("sleep-for", Fsleep_for, Ssleep_for, 1, 2, 0,
7ee72033 5969 doc: /* Pause, without updating display, for SECONDS seconds.
228299fa
GM
5970SECONDS may be a floating-point value, meaning that you can wait for a
5971fraction of a second. Optional second arg MILLISECONDS specifies an
5972additional wait period, in milliseconds; this may be useful if your
5973Emacs was built without floating point support.
7ee72033 5974\(Not all operating systems support waiting for a fraction of a second.) */)
5842a27b 5975 (Lisp_Object seconds, Lisp_Object milliseconds)
4588ec20 5976{
767229f8 5977 int sec, usec;
4588ec20 5978
767229f8 5979 if (NILP (milliseconds))
e9c9a718 5980 XSETINT (milliseconds, 0);
767229f8 5981 else
b7826503 5982 CHECK_NUMBER (milliseconds);
b07646f5
JB
5983 usec = XINT (milliseconds) * 1000;
5984
b07646f5
JB
5985 {
5986 double duration = extract_float (seconds);
5987 sec = (int) duration;
5988 usec += (duration - sec) * 1000000;
5989 }
4588ec20 5990
a41f8bed 5991#ifndef EMACS_HAS_USECS
767229f8 5992 if (sec == 0 && usec != 0)
861e19b9 5993 error ("Millisecond `sleep-for' not supported on %s", SYSTEM_TYPE);
4588ec20 5994#endif
767229f8
JB
5995
5996 /* Assure that 0 <= usec < 1000000. */
5997 if (usec < 0)
5998 {
153a073c 5999 /* We can't rely on the rounding being correct if usec is negative. */
767229f8
JB
6000 if (-1000000 < usec)
6001 sec--, usec += 1000000;
6002 else
6003 sec -= -usec / 1000000, usec = 1000000 - (-usec % 1000000);
4588ec20 6004 }
767229f8
JB
6005 else
6006 sec += usec / 1000000, usec %= 1000000;
6007
6b5153b1 6008 if (sec < 0 || (sec == 0 && usec == 0))
767229f8 6009 return Qnil;
4588ec20 6010
dcd1ca45 6011 wait_reading_process_output (sec, usec, 0, 0, Qnil, NULL, 0);
4588ec20
JB
6012
6013 return Qnil;
6014}
6015
5f5c8ee5 6016
dcd1ca45 6017/* This is just like wait_reading_process_output, except that
902b9b6d 6018 it does redisplay.
f76475ad 6019
2bcac766
CY
6020 TIMEOUT is number of seconds to wait (float or integer),
6021 or t to wait forever.
902b9b6d
KS
6022 READING is 1 if reading input.
6023 If DO_DISPLAY is >0 display process output while waiting.
6024 If DO_DISPLAY is >1 perform an initial redisplay before waiting.
6025*/
4588ec20 6026
f76475ad 6027Lisp_Object
971de7fb 6028sit_for (Lisp_Object timeout, int reading, int do_display)
f76475ad 6029{
902b9b6d 6030 int sec, usec;
f222369e 6031
902b9b6d 6032 swallow_events (do_display);
ccddf474 6033
902b9b6d 6034 if ((detect_input_pending_run_timers (do_display))
29bcbe54 6035 || !NILP (Vexecuting_kbd_macro))
4588ec20 6036 return Qnil;
4588ec20 6037
902b9b6d
KS
6038 if (do_display >= 2)
6039 redisplay_preserve_echo_area (2);
6040
8e09f23f 6041 if (INTEGERP (timeout))
f222369e 6042 {
7ff14773 6043 sec = XINT (timeout);
8e09f23f 6044 usec = 0;
f222369e 6045 }
8e09f23f
KS
6046 else if (FLOATP (timeout))
6047 {
99a20368 6048 double seconds = XFLOAT_DATA (timeout);
902b9b6d
KS
6049 sec = (int) seconds;
6050 usec = (int) ((seconds - sec) * 1000000);
6051 }
2bcac766
CY
6052 else if (EQ (timeout, Qt))
6053 {
6054 sec = 0;
6055 usec = 0;
6056 }
902b9b6d 6057 else
8e09f23f 6058 wrong_type_argument (Qnumberp, timeout);
4588ec20 6059
2bcac766 6060 if (sec == 0 && usec == 0 && !EQ (timeout, Qt))
dfdb645c
JB
6061 return Qt;
6062
4588ec20 6063#ifdef SIGIO
8fc798e9 6064 gobble_input (0);
f76475ad
JB
6065#endif
6066
902b9b6d 6067 wait_reading_process_output (sec, usec, reading ? -1 : 1, do_display,
dcd1ca45 6068 Qnil, NULL, 0);
f76475ad 6069
4588ec20
JB
6070 return detect_input_pending () ? Qnil : Qt;
6071}
6072
5f5c8ee5 6073
01327edf
KS
6074DEFUN ("redisplay", Fredisplay, Sredisplay, 0, 1, 0,
6075 doc: /* Perform redisplay if no input is available.
a5c2c707 6076If optional arg FORCE is non-nil or `redisplay-dont-pause' is non-nil,
03240971
KS
6077perform a full redisplay even if input is available.
6078Return t if redisplay was performed, nil otherwise. */)
5842a27b 6079 (Lisp_Object force)
f76475ad 6080{
01327edf 6081 int count;
659d9874 6082
902b9b6d
KS
6083 swallow_events (1);
6084 if ((detect_input_pending_run_timers (1)
01327edf 6085 && NILP (force) && !redisplay_dont_pause)
7ba07a1a
CY
6086 || !NILP (Vexecuting_kbd_macro))
6087 return Qnil;
f76475ad 6088
01327edf
KS
6089 count = SPECPDL_INDEX ();
6090 if (!NILP (force) && !redisplay_dont_pause)
6091 specbind (Qredisplay_dont_pause, Qt);
7ba07a1a 6092 redisplay_preserve_echo_area (2);
01327edf 6093 unbind_to (count, Qnil);
7ba07a1a 6094 return Qt;
f76475ad 6095}
5f5c8ee5
GM
6096
6097
6098\f
6099/***********************************************************************
6100 Other Lisp Functions
6101 ***********************************************************************/
6102
6103/* A vector of size >= 2 * NFRAMES + 3 * NBUFFERS + 1, containing the
6104 session's frames, frame names, buffers, buffer-read-only flags, and
44edd521 6105 buffer-modified-flags. */
5f5c8ee5
GM
6106
6107static Lisp_Object frame_and_buffer_state;
6108
6109
6110DEFUN ("frame-or-buffer-changed-p", Fframe_or_buffer_changed_p,
44edd521 6111 Sframe_or_buffer_changed_p, 0, 1, 0,
bacf09b4 6112 doc: /* Return non-nil if the frame and buffer state appears to have changed.
44edd521
RS
6113VARIABLE is a variable name whose value is either nil or a state vector
6114that will be updated to contain all frames and buffers,
228299fa 6115aside from buffers whose names start with space,
44edd521
RS
6116along with the buffers' read-only and modified flags. This allows a fast
6117check to see whether buffer menus might need to be recomputed.
228299fa 6118If this function returns non-nil, it updates the internal vector to reflect
44edd521
RS
6119the current state.
6120
6121If VARIABLE is nil, an internal variable is used. Users should not
6122pass nil for VARIABLE. */)
5842a27b 6123 (Lisp_Object variable)
5f5c8ee5 6124{
44edd521
RS
6125 Lisp_Object state, tail, frame, buf;
6126 Lisp_Object *vecp, *end;
5f5c8ee5
GM
6127 int n;
6128
44edd521
RS
6129 if (! NILP (variable))
6130 {
6131 CHECK_SYMBOL (variable);
6132 state = Fsymbol_value (variable);
6133 if (! VECTORP (state))
6134 goto changed;
6135 }
6136 else
6137 state = frame_and_buffer_state;
6138
6139 vecp = XVECTOR (state)->contents;
6140 end = vecp + XVECTOR (state)->size;
6141
5f5c8ee5
GM
6142 FOR_EACH_FRAME (tail, frame)
6143 {
44edd521
RS
6144 if (vecp == end)
6145 goto changed;
5f5c8ee5
GM
6146 if (!EQ (*vecp++, frame))
6147 goto changed;
44edd521
RS
6148 if (vecp == end)
6149 goto changed;
5f5c8ee5
GM
6150 if (!EQ (*vecp++, XFRAME (frame)->name))
6151 goto changed;
6152 }
44edd521 6153 /* Check that the buffer info matches. */
7539e11f 6154 for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
5f5c8ee5 6155 {
7539e11f 6156 buf = XCDR (XCAR (tail));
5f5c8ee5 6157 /* Ignore buffers that aren't included in buffer lists. */
d5db4077 6158 if (SREF (XBUFFER (buf)->name, 0) == ' ')
5f5c8ee5 6159 continue;
44edd521
RS
6160 if (vecp == end)
6161 goto changed;
5f5c8ee5
GM
6162 if (!EQ (*vecp++, buf))
6163 goto changed;
44edd521
RS
6164 if (vecp == end)
6165 goto changed;
5f5c8ee5
GM
6166 if (!EQ (*vecp++, XBUFFER (buf)->read_only))
6167 goto changed;
44edd521
RS
6168 if (vecp == end)
6169 goto changed;
5f5c8ee5
GM
6170 if (!EQ (*vecp++, Fbuffer_modified_p (buf)))
6171 goto changed;
6172 }
44edd521
RS
6173 if (vecp == end)
6174 goto changed;
5f5c8ee5
GM
6175 /* Detect deletion of a buffer at the end of the list. */
6176 if (EQ (*vecp, Qlambda))
6177 return Qnil;
44edd521
RS
6178
6179 /* Come here if we decide the data has changed. */
5f5c8ee5 6180 changed:
44edd521
RS
6181 /* Count the size we will need.
6182 Start with 1 so there is room for at least one lambda at the end. */
5f5c8ee5
GM
6183 n = 1;
6184 FOR_EACH_FRAME (tail, frame)
6185 n += 2;
7539e11f 6186 for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
5f5c8ee5 6187 n += 3;
44edd521
RS
6188 /* Reallocate the vector if data has grown to need it,
6189 or if it has shrunk a lot. */
6190 if (! VECTORP (state)
6191 || n > XVECTOR (state)->size
6192 || n + 20 < XVECTOR (state)->size / 2)
5f5c8ee5 6193 /* Add 20 extra so we grow it less often. */
44edd521
RS
6194 {
6195 state = Fmake_vector (make_number (n + 20), Qlambda);
6196 if (! NILP (variable))
6197 Fset (variable, state);
6198 else
6199 frame_and_buffer_state = state;
6200 }
6201
6202 /* Record the new data in the (possibly reallocated) vector. */
6203 vecp = XVECTOR (state)->contents;
5f5c8ee5
GM
6204 FOR_EACH_FRAME (tail, frame)
6205 {
6206 *vecp++ = frame;
6207 *vecp++ = XFRAME (frame)->name;
6208 }
7539e11f 6209 for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
5f5c8ee5 6210 {
7539e11f 6211 buf = XCDR (XCAR (tail));
5f5c8ee5 6212 /* Ignore buffers that aren't included in buffer lists. */
d5db4077 6213 if (SREF (XBUFFER (buf)->name, 0) == ' ')
5f5c8ee5
GM
6214 continue;
6215 *vecp++ = buf;
6216 *vecp++ = XBUFFER (buf)->read_only;
6217 *vecp++ = Fbuffer_modified_p (buf);
6218 }
6219 /* Fill up the vector with lambdas (always at least one). */
6220 *vecp++ = Qlambda;
44edd521
RS
6221 while (vecp - XVECTOR (state)->contents
6222 < XVECTOR (state)->size)
5f5c8ee5
GM
6223 *vecp++ = Qlambda;
6224 /* Make sure we didn't overflow the vector. */
44edd521
RS
6225 if (vecp - XVECTOR (state)->contents
6226 > XVECTOR (state)->size)
5f5c8ee5
GM
6227 abort ();
6228 return Qt;
6229}
6230
6231
4588ec20 6232\f
5f5c8ee5
GM
6233/***********************************************************************
6234 Initialization
6235***********************************************************************/
6236
5f5c8ee5
GM
6237/* Initialization done when Emacs fork is started, before doing stty.
6238 Determine terminal type and set terminal_driver. Then invoke its
6239 decoding routine to set up variables in the terminal package. */
4588ec20 6240
dfcf069d 6241void
971de7fb 6242init_display (void)
4588ec20 6243{
28d440ab
KL
6244 char *terminal_type;
6245
4588ec20
JB
6246#ifdef HAVE_X_WINDOWS
6247 extern int display_arg;
6248#endif
6249
5f5c8ee5
GM
6250 /* Construct the space glyph. */
6251 space_glyph.type = CHAR_GLYPH;
3fc809e2 6252 SET_CHAR_GLYPH (space_glyph, ' ', DEFAULT_FACE_ID, 0);
5f5c8ee5
GM
6253 space_glyph.charpos = -1;
6254
4588ec20
JB
6255 inverse_video = 0;
6256 cursor_in_echo_area = 0;
6257 terminal_type = (char *) 0;
6258
1315c181
JB
6259 /* Now is the time to initialize this; it's used by init_sys_modes
6260 during startup. */
2246281f 6261 Vinitial_window_system = Qnil;
4588ec20 6262
4181ad9c
KL
6263 /* SIGWINCH needs to be handled no matter what display we start
6264 with. Otherwise newly opened tty frames will not resize
6265 automatically. */
6266#ifdef SIGWINCH
6267#ifndef CANNOT_DUMP
6268 if (initialized)
6269#endif /* CANNOT_DUMP */
6270 signal (SIGWINCH, window_change_signal);
6271#endif /* SIGWINCH */
4588ec20 6272
d6ef42b9 6273 /* If running as a daemon, no need to initialize any frames/terminal. */
ff808935
DN
6274 if (IS_DAEMON)
6275 return;
d6ef42b9 6276
1315c181
JB
6277 /* If the user wants to use a window system, we shouldn't bother
6278 initializing the terminal. This is especially important when the
6279 terminal is so dumb that emacs gives up before and doesn't bother
6280 using the window system.
4588ec20 6281
36bbad1d
KH
6282 If the DISPLAY environment variable is set and nonempty,
6283 try to use X, and die with an error message if that doesn't work. */
4588ec20
JB
6284
6285#ifdef HAVE_X_WINDOWS
00d70d57 6286 if (! inhibit_window_system && ! display_arg)
d460af17 6287 {
36bbad1d 6288 char *display;
36bbad1d 6289 display = getenv ("DISPLAY");
36bbad1d 6290 display_arg = (display != 0 && *display != 0);
c1fc674b
AS
6291
6292 if (display_arg && !x_display_ok (display))
6293 {
6294 fprintf (stderr, "Display %s unavailable, simulating -nw\n",
6295 display);
6296 inhibit_window_system = 1;
6297 }
f040093a 6298 }
d460af17 6299
177c0ea7 6300 if (!inhibit_window_system && display_arg
9e4555e8
RS
6301#ifndef CANNOT_DUMP
6302 && initialized
6303#endif
6304 )
4588ec20 6305 {
111d9af3 6306 Vinitial_window_system = Qx;
4588ec20
JB
6307#ifdef HAVE_X11
6308 Vwindow_system_version = make_number (11);
039e5d71 6309#endif
8a2a6032 6310#if defined (GNU_LINUX) && defined (HAVE_LIBNCURSES)
039e5d71 6311 /* In some versions of ncurses,
6a428f77 6312 tputs crashes if we have not called tgetent.
039e5d71
KH
6313 So call tgetent. */
6314 { char b[2044]; tgetent (b, "xterm");}
4588ec20 6315#endif
5f5c8ee5 6316 adjust_frame_glyphs_initially ();
4588ec20
JB
6317 return;
6318 }
6319#endif /* HAVE_X_WINDOWS */
6320
fd2e066a 6321#ifdef HAVE_NTGUI
177c0ea7 6322 if (!inhibit_window_system)
fd2e066a 6323 {
111d9af3 6324 Vinitial_window_system = Qw32;
fd2e066a 6325 Vwindow_system_version = make_number (1);
5f5c8ee5 6326 adjust_frame_glyphs_initially ();
fd2e066a
GV
6327 return;
6328 }
6329#endif /* HAVE_NTGUI */
6330
edfda783
AR
6331#ifdef HAVE_NS
6332 if (!inhibit_window_system
6333#ifndef CANNOT_DUMP
6334 && initialized
6335#endif
6336 )
6337 {
111d9af3 6338 Vinitial_window_system = Qns;
edfda783
AR
6339 Vwindow_system_version = make_number(10);
6340 adjust_frame_glyphs_initially ();
6341 return;
6342 }
6343#endif
6344
4588ec20
JB
6345 /* If no window system has been specified, try to use the terminal. */
6346 if (! isatty (0))
6347 {
1559a86d 6348 fatal ("standard input is not a tty");
4588ec20
JB
6349 exit (1);
6350 }
6351
6152361f
JR
6352#ifdef WINDOWSNT
6353 terminal_type = "w32console";
6354#else
153a073c 6355 /* Look at the TERM variable. */
4588ec20 6356 terminal_type = (char *) getenv ("TERM");
6152361f 6357#endif
4588ec20
JB
6358 if (!terminal_type)
6359 {
5d12ff0b 6360#ifdef HAVE_WINDOW_SYSTEM
b9e590fc
RS
6361 if (! inhibit_window_system)
6362 fprintf (stderr, "Please set the environment variable DISPLAY or TERM (see `tset').\n");
5d12ff0b
RS
6363 else
6364#endif /* HAVE_WINDOW_SYSTEM */
b9e590fc 6365 fprintf (stderr, "Please set the environment variable TERM; see `tset'.\n");
4588ec20
JB
6366 exit (1);
6367 }
6368
0a125897 6369 {
6ed8eeff 6370 struct terminal *t;
3224dac1
KL
6371 struct frame *f = XFRAME (selected_frame);
6372
6373 /* Open a display on the controlling tty. */
6ed8eeff 6374 t = init_tty (0, terminal_type, 1); /* Errors are fatal. */
3224dac1
KL
6375
6376 /* Convert the initial frame to use the new display. */
b04f5ad2 6377 if (f->output_method != output_initial)
3224dac1 6378 abort ();
6ed8eeff
KL
6379 f->output_method = t->type;
6380 f->terminal = t;
3224dac1 6381
6ed8eeff
KL
6382 t->reference_count++;
6383 t->display_info.tty->top_frame = selected_frame;
5b65d888 6384 change_frame_size (XFRAME (selected_frame),
6ed8eeff
KL
6385 FrameRows (t->display_info.tty),
6386 FrameCols (t->display_info.tty), 0, 0, 1);
3224dac1 6387
6ed8eeff
KL
6388 /* Delete the initial terminal. */
6389 if (--initial_terminal->reference_count == 0
6390 && initial_terminal->delete_terminal_hook)
6391 (*initial_terminal->delete_terminal_hook) (initial_terminal);
2666355c
KL
6392
6393 /* Update frame parameters to reflect the new type. */
6394 Fmodify_frame_parameters
6395 (selected_frame, Fcons (Fcons (Qtty_type,
6ed8eeff 6396 Ftty_type (selected_frame)), Qnil));
657ceaa0
EZ
6397 if (t->display_info.tty->name)
6398 Fmodify_frame_parameters (selected_frame,
6399 Fcons (Fcons (Qtty, build_string (t->display_info.tty->name)),
6400 Qnil));
6401 else
6402 Fmodify_frame_parameters (selected_frame, Fcons (Fcons (Qtty, Qnil),
6403 Qnil));
0a125897 6404 }
3fc809e2 6405
d86c299a 6406 {
91fb7e1b 6407 struct frame *sf = SELECTED_FRAME ();
7df02016
KS
6408 int width = FRAME_TOTAL_COLS (sf);
6409 int height = FRAME_LINES (sf);
d86c299a 6410
5f5c8ee5 6411 unsigned int total_glyphs = height * (width + 2) * sizeof (struct glyph);
d86c299a 6412
5f5c8ee5
GM
6413 /* If these sizes are so big they cause overflow, just ignore the
6414 change. It's not clear what better we could do. */
6415 if (total_glyphs / sizeof (struct glyph) / height != width + 2)
1559a86d 6416 fatal ("screen size %dx%d too big", width, height);
d86c299a
RS
6417 }
6418
5f5c8ee5 6419 adjust_frame_glyphs_initially ();
91fb7e1b 6420 calculate_costs (XFRAME (selected_frame));
4588ec20 6421
5f5c8ee5
GM
6422 /* Set up faces of the initial terminal frame of a dumped Emacs. */
6423 if (initialized
6424 && !noninteractive
2246281f 6425 && NILP (Vinitial_window_system))
2d764c78
EZ
6426 {
6427 /* For the initial frame, we don't have any way of knowing what
6428 are the foreground and background colors of the terminal. */
6429 struct frame *sf = SELECTED_FRAME();
6430
f9d2fdc4
EZ
6431 FRAME_FOREGROUND_PIXEL (sf) = FACE_TTY_DEFAULT_FG_COLOR;
6432 FRAME_BACKGROUND_PIXEL (sf) = FACE_TTY_DEFAULT_BG_COLOR;
2d764c78
EZ
6433 call0 (intern ("tty-set-up-initial-frame-faces"));
6434 }
5f5c8ee5
GM
6435}
6436
6437
6438\f
6439/***********************************************************************
6440 Blinking cursor
6441 ***********************************************************************/
6442
c3f13540 6443DEFUN ("internal-show-cursor", Finternal_show_cursor,
5d7791b3 6444 Sinternal_show_cursor, 2, 2, 0,
7ee72033 6445 doc: /* Set the cursor-visibility flag of WINDOW to SHOW.
228299fa
GM
6446WINDOW nil means use the selected window. SHOW non-nil means
6447show a cursor in WINDOW in the next redisplay. SHOW nil means
7ee72033 6448don't show a cursor. */)
5842a27b 6449 (Lisp_Object window, Lisp_Object show)
5f5c8ee5 6450{
5f5c8ee5
GM
6451 /* Don't change cursor state while redisplaying. This could confuse
6452 output routines. */
6453 if (!redisplaying_p)
6454 {
6455 if (NILP (window))
6456 window = selected_window;
6457 else
b7826503 6458 CHECK_WINDOW (window);
177c0ea7 6459
5d7791b3 6460 XWINDOW (window)->cursor_off_p = NILP (show);
5f5c8ee5
GM
6461 }
6462
6463 return Qnil;
4588ec20 6464}
5f5c8ee5
GM
6465
6466
5d7791b3
GM
6467DEFUN ("internal-show-cursor-p", Finternal_show_cursor_p,
6468 Sinternal_show_cursor_p, 0, 1, 0,
bacf09b4 6469 doc: /* Value is non-nil if next redisplay will display a cursor in WINDOW.
7ee72033 6470WINDOW nil or omitted means report on the selected window. */)
5842a27b 6471 (Lisp_Object window)
5d7791b3
GM
6472{
6473 struct window *w;
177c0ea7 6474
5d7791b3
GM
6475 if (NILP (window))
6476 window = selected_window;
6477 else
b7826503 6478 CHECK_WINDOW (window);
177c0ea7 6479
5d7791b3 6480 w = XWINDOW (window);
177c0ea7 6481 return w->cursor_off_p ? Qnil : Qt;
5d7791b3
GM
6482}
6483
87478b52
SM
6484DEFUN ("last-nonminibuffer-frame", Flast_nonminibuf_frame,
6485 Slast_nonminibuf_frame, 0, 0, 0,
6486 doc: /* Value is last nonminibuffer frame. */)
5842a27b 6487 (void)
87478b52 6488{
4958ed94 6489 Lisp_Object frame = Qnil;
87478b52 6490
4958ed94
SM
6491 if (last_nonminibuf_frame)
6492 XSETFRAME (frame, last_nonminibuf_frame);
87478b52
SM
6493
6494 return frame;
6495}
4588ec20 6496\f
5f5c8ee5
GM
6497/***********************************************************************
6498 Initialization
6499 ***********************************************************************/
6500
dfcf069d 6501void
971de7fb 6502syms_of_display (void)
4588ec20 6503{
502b9b64 6504 defsubr (&Sredraw_frame);
4588ec20 6505 defsubr (&Sredraw_display);
078b3696 6506 defsubr (&Sframe_or_buffer_changed_p);
4588ec20
JB
6507 defsubr (&Sopen_termscript);
6508 defsubr (&Sding);
7ba07a1a 6509 defsubr (&Sredisplay);
4588ec20
JB
6510 defsubr (&Ssleep_for);
6511 defsubr (&Ssend_string_to_terminal);
c3f13540 6512 defsubr (&Sinternal_show_cursor);
5d7791b3 6513 defsubr (&Sinternal_show_cursor_p);
87478b52 6514 defsubr (&Slast_nonminibuf_frame);
4588ec20 6515
2d5912c1 6516#if GLYPH_DEBUG
9b0e97aa
GM
6517 defsubr (&Sdump_redisplay_history);
6518#endif
6519
d1dad759 6520 frame_and_buffer_state = Fmake_vector (make_number (20), Qlambda);
078b3696
KH
6521 staticpro (&frame_and_buffer_state);
6522
d67b4f80 6523 Qdisplay_table = intern_c_string ("display-table");
9cda4f7c 6524 staticpro (&Qdisplay_table);
d67b4f80 6525 Qredisplay_dont_pause = intern_c_string ("redisplay-dont-pause");
e7067d00 6526 staticpro (&Qredisplay_dont_pause);
9cda4f7c 6527
7ee72033 6528 DEFVAR_INT ("baud-rate", &baud_rate,
bacf09b4 6529 doc: /* *The output baud rate of the terminal.
228299fa
GM
6530On most systems, changing this value will affect the amount of padding
6531and the other strategic decisions made during redisplay. */);
177c0ea7 6532
7ee72033 6533 DEFVAR_BOOL ("inverse-video", &inverse_video,
bacf09b4 6534 doc: /* *Non-nil means invert the entire frame display.
228299fa 6535This means everything is in inverse video which otherwise would not be. */);
177c0ea7 6536
7ee72033 6537 DEFVAR_BOOL ("visible-bell", &visible_bell,
bacf09b4 6538 doc: /* *Non-nil means try to flash the frame to represent a bell.
552b1b01
EZ
6539
6540See also `ring-bell-function'. */);
177c0ea7 6541
7ee72033 6542 DEFVAR_BOOL ("no-redraw-on-reenter", &no_redraw_on_reenter,
bacf09b4 6543 doc: /* *Non-nil means no need to redraw entire frame after suspending.
228299fa
GM
6544A non-nil value is useful if the terminal can automatically preserve
6545Emacs's frame display when you reenter Emacs.
6546It is up to you to set this variable if your terminal can do that. */);
177c0ea7 6547
2246281f
KL
6548 DEFVAR_LISP ("initial-window-system", &Vinitial_window_system,
6549 doc: /* Name of the window system that Emacs uses for the first frame.
85565e9e
RS
6550The value is a symbol--for instance, `x' for X windows.
6551The value is nil if Emacs is using a text-only terminal. */);
177c0ea7 6552
70b8d0a4
SM
6553 DEFVAR_KBOARD ("window-system", Vwindow_system,
6554 doc: /* Name of window system through which the selected frame is displayed.
6555The value is a symbol--for instance, `x' for X windows.
6556The value is nil if the selected frame is on a text-only-terminal. */);
6557
7ee72033 6558 DEFVAR_LISP ("window-system-version", &Vwindow_system_version,
bacf09b4 6559 doc: /* The version number of the window system in use.
c22140f6 6560For X windows, this is 11. */);
177c0ea7 6561
7ee72033 6562 DEFVAR_BOOL ("cursor-in-echo-area", &cursor_in_echo_area,
bacf09b4 6563 doc: /* Non-nil means put cursor in minibuffer, at end of any message there. */);
177c0ea7 6564
7ee72033 6565 DEFVAR_LISP ("glyph-table", &Vglyph_table,
bacf09b4 6566 doc: /* Table defining how to output a glyph code to the frame.
228299fa
GM
6567If not nil, this is a vector indexed by glyph code to define the glyph.
6568Each element can be:
6569 integer: a glyph code which this glyph is an alias for.
6570 string: output this glyph using that string (not impl. in X windows).
6571 nil: this glyph mod 524288 is the code of a character to output,
6572 and this glyph / 524288 is the face number (see `face-id') to use
6573 while outputting it. */);
4588ec20
JB
6574 Vglyph_table = Qnil;
6575
7ee72033 6576 DEFVAR_LISP ("standard-display-table", &Vstandard_display_table,
bacf09b4 6577 doc: /* Display table to use for buffers that specify none.
228299fa 6578See `buffer-display-table' for more information. */);
4588ec20
JB
6579 Vstandard_display_table = Qnil;
6580
7ee72033 6581 DEFVAR_BOOL ("redisplay-dont-pause", &redisplay_dont_pause,
bacf09b4 6582 doc: /* *Non-nil means update isn't paused when input is detected. */);
5f5c8ee5
GM
6583 redisplay_dont_pause = 0;
6584
d012c62b
KS
6585#if PERIODIC_PREEMPTION_CHECKING
6586 DEFVAR_LISP ("redisplay-preemption-period", &Vredisplay_preemption_period,
6587 doc: /* *The period in seconds between checking for input during redisplay.
6588If input is detected, redisplay is pre-empted, and the input is processed.
6589If nil, never pre-empt redisplay. */);
6590 Vredisplay_preemption_period = make_float (0.10);
6591#endif
6592
4588ec20
JB
6593#ifdef CANNOT_DUMP
6594 if (noninteractive)
6595#endif
6596 {
2246281f 6597 Vinitial_window_system = Qnil;
4588ec20
JB
6598 Vwindow_system_version = Qnil;
6599 }
6600}
6b61353c
KH
6601
6602/* arch-tag: 8d812b1f-04a2-4195-a9c4-381f8457a413
6603 (do not change this comment) */