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Do not crash if in buffer mode and the last buffer is deleted using the
[tmux-openbsd.git] / screen-write.c
blob25158ee561720e27a0a1b1f799f3da23f0577448
1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include "tmux.h"
25
26 static struct screen_write_citem *screen_write_collect_trim(
27 struct screen_write_ctx *, u_int, u_int, u_int, int *);
28 static void screen_write_collect_clear(struct screen_write_ctx *, u_int,
29 u_int);
30 static void screen_write_collect_scroll(struct screen_write_ctx *, u_int);
31 static void screen_write_collect_flush(struct screen_write_ctx *, int,
32 const char *);
33 static int screen_write_overwrite(struct screen_write_ctx *,
34 struct grid_cell *, u_int);
35 static const struct grid_cell *screen_write_combine(struct screen_write_ctx *,
36 const struct utf8_data *, u_int *, u_int *);
37
38 struct screen_write_citem {
39 u_int x;
40 int wrapped;
41
42 enum { TEXT, CLEAR } type;
43 u_int used;
44 u_int bg;
45
46 struct grid_cell gc;
47
48 TAILQ_ENTRY(screen_write_citem) entry;
49 };
50 struct screen_write_cline {
51 char *data;
52 TAILQ_HEAD(, screen_write_citem) items;
53 };
54 TAILQ_HEAD(, screen_write_citem) screen_write_citem_freelist =
55 TAILQ_HEAD_INITIALIZER(screen_write_citem_freelist);
56
57 static struct screen_write_citem *
58 screen_write_get_citem(void)
59 {
60 struct screen_write_citem *ci;
61
62 ci = TAILQ_FIRST(&screen_write_citem_freelist);
63 if (ci != NULL) {
64 TAILQ_REMOVE(&screen_write_citem_freelist, ci, entry);
65 memset(ci, 0, sizeof *ci);
66 return (ci);
67 }
68 return (xcalloc(1, sizeof *ci));
69 }
70
71 static void
72 screen_write_free_citem(struct screen_write_citem *ci)
73 {
74 TAILQ_INSERT_TAIL(&screen_write_citem_freelist, ci, entry);
75 }
76
77 static void
78 screen_write_offset_timer(__unused int fd, __unused short events, void *data)
79 {
80 struct window *w = data;
81
82 tty_update_window_offset(w);
83 }
84
85 /* Set cursor position. */
86 static void
87 screen_write_set_cursor(struct screen_write_ctx *ctx, int cx, int cy)
88 {
89 struct window_pane *wp = ctx->wp;
90 struct window *w;
91 struct screen *s = ctx->s;
92 struct timeval tv = { .tv_usec = 10000 };
93
94 if (cx != -1 && (u_int)cx == s->cx && cy != -1 && (u_int)cy == s->cy)
95 return;
96
97 if (cx != -1) {
98 if ((u_int)cx > screen_size_x(s)) /* allow last column */
99 cx = screen_size_x(s) - 1;
100 s->cx = cx;
101 }
102 if (cy != -1) {
103 if ((u_int)cy > screen_size_y(s) - 1)
104 cy = screen_size_y(s) - 1;
105 s->cy = cy;
106 }
107
108 if (wp == NULL)
109 return;
110 w = wp->window;
111
112 if (!event_initialized(&w->offset_timer))
113 evtimer_set(&w->offset_timer, screen_write_offset_timer, w);
114 if (!evtimer_pending(&w->offset_timer, NULL))
115 evtimer_add(&w->offset_timer, &tv);
116 }
117
118 /* Do a full redraw. */
119 static void
120 screen_write_redraw_cb(const struct tty_ctx *ttyctx)
121 {
122 struct window_pane *wp = ttyctx->arg;
123
124 if (wp != NULL)
125 wp->flags |= PANE_REDRAW;
126 }
127
128 /* Update context for client. */
129 static int
130 screen_write_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
131 {
132 struct window_pane *wp = ttyctx->arg;
133
134 if (ttyctx->allow_invisible_panes) {
135 if (session_has(c->session, wp->window))
136 return (1);
137 return (0);
138 }
139
140 if (c->session->curw->window != wp->window)
141 return (0);
142 if (wp->layout_cell == NULL)
143 return (0);
144
145 if (wp->flags & (PANE_REDRAW|PANE_DROP))
146 return (-1);
147 if (c->flags & CLIENT_REDRAWPANES) {
148 /*
149 * Redraw is already deferred to redraw another pane - redraw
150 * this one also when that happens.
151 */
152 log_debug("%s: adding %%%u to deferred redraw", __func__,
153 wp->id);
154 wp->flags |= PANE_REDRAW;
155 return (-1);
156 }
157
158 ttyctx->bigger = tty_window_offset(&c->tty, &ttyctx->wox, &ttyctx->woy,
159 &ttyctx->wsx, &ttyctx->wsy);
160
161 ttyctx->xoff = ttyctx->rxoff = wp->xoff;
162 ttyctx->yoff = ttyctx->ryoff = wp->yoff;
163
164 if (status_at_line(c) == 0)
165 ttyctx->yoff += status_line_size(c);
166
167 return (1);
168 }
169
170 /* Set up context for TTY command. */
171 static void
172 screen_write_initctx(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
173 int sync)
174 {
175 struct screen *s = ctx->s;
176
177 memset(ttyctx, 0, sizeof *ttyctx);
178
179 ttyctx->s = s;
180 ttyctx->sx = screen_size_x(s);
181 ttyctx->sy = screen_size_y(s);
182
183 ttyctx->ocx = s->cx;
184 ttyctx->ocy = s->cy;
185 ttyctx->orlower = s->rlower;
186 ttyctx->orupper = s->rupper;
187
188 memcpy(&ttyctx->defaults, &grid_default_cell, sizeof ttyctx->defaults);
189 if (ctx->init_ctx_cb != NULL) {
190 ctx->init_ctx_cb(ctx, ttyctx);
191 if (ttyctx->palette != NULL) {
192 if (ttyctx->defaults.fg == 8)
193 ttyctx->defaults.fg = ttyctx->palette->fg;
194 if (ttyctx->defaults.bg == 8)
195 ttyctx->defaults.bg = ttyctx->palette->bg;
196 }
197 } else {
198 ttyctx->redraw_cb = screen_write_redraw_cb;
199 if (ctx->wp != NULL) {
200 tty_default_colours(&ttyctx->defaults, ctx->wp);
201 ttyctx->palette = &ctx->wp->palette;
202 ttyctx->set_client_cb = screen_write_set_client_cb;
203 ttyctx->arg = ctx->wp;
204 }
205 }
206
207 if (~ctx->flags & SCREEN_WRITE_SYNC) {
208 /*
209 * For the active pane or for an overlay (no pane), we want to
210 * only use synchronized updates if requested (commands that
211 * move the cursor); for other panes, always use it, since the
212 * cursor will have to move.
213 */
214 if (ctx->wp != NULL) {
215 if (ctx->wp != ctx->wp->window->active)
216 ttyctx->num = 1;
217 else
218 ttyctx->num = sync;
219 } else
220 ttyctx->num = 0x10|sync;
221 tty_write(tty_cmd_syncstart, ttyctx);
222 ctx->flags |= SCREEN_WRITE_SYNC;
223 }
224 }
225
226 /* Make write list. */
227 void
228 screen_write_make_list(struct screen *s)
229 {
230 u_int y;
231
232 s->write_list = xcalloc(screen_size_y(s), sizeof *s->write_list);
233 for (y = 0; y < screen_size_y(s); y++)
234 TAILQ_INIT(&s->write_list[y].items);
235 }
236
237 /* Free write list. */
238 void
239 screen_write_free_list(struct screen *s)
240 {
241 u_int y;
242
243 for (y = 0; y < screen_size_y(s); y++)
244 free(s->write_list[y].data);
245 free(s->write_list);
246 }
247
248 /* Set up for writing. */
249 static void
250 screen_write_init(struct screen_write_ctx *ctx, struct screen *s)
251 {
252 memset(ctx, 0, sizeof *ctx);
253
254 ctx->s = s;
255
256 if (ctx->s->write_list == NULL)
257 screen_write_make_list(ctx->s);
258 ctx->item = screen_write_get_citem();
259
260 ctx->scrolled = 0;
261 ctx->bg = 8;
262 }
263
264 /* Initialize writing with a pane. */
265 void
266 screen_write_start_pane(struct screen_write_ctx *ctx, struct window_pane *wp,
267 struct screen *s)
268 {
269 if (s == NULL)
270 s = wp->screen;
271 screen_write_init(ctx, s);
272 ctx->wp = wp;
273
274 if (log_get_level() != 0) {
275 log_debug("%s: size %ux%u, pane %%%u (at %u,%u)",
276 __func__, screen_size_x(ctx->s), screen_size_y(ctx->s),
277 wp->id, wp->xoff, wp->yoff);
278 }
279 }
280
281 /* Initialize writing with a callback. */
282 void
283 screen_write_start_callback(struct screen_write_ctx *ctx, struct screen *s,
284 screen_write_init_ctx_cb cb, void *arg)
285 {
286 screen_write_init(ctx, s);
287
288 ctx->init_ctx_cb = cb;
289 ctx->arg = arg;
290
291 if (log_get_level() != 0) {
292 log_debug("%s: size %ux%u, with callback", __func__,
293 screen_size_x(ctx->s), screen_size_y(ctx->s));
294 }
295 }
296
297 /* Initialize writing. */
298 void
299 screen_write_start(struct screen_write_ctx *ctx, struct screen *s)
300 {
301 screen_write_init(ctx, s);
302
303 if (log_get_level() != 0) {
304 log_debug("%s: size %ux%u, no pane", __func__,
305 screen_size_x(ctx->s), screen_size_y(ctx->s));
306 }
307 }
308
309 /* Finish writing. */
310 void
311 screen_write_stop(struct screen_write_ctx *ctx)
312 {
313 screen_write_collect_end(ctx);
314 screen_write_collect_flush(ctx, 0, __func__);
315
316 screen_write_free_citem(ctx->item);
317 }
318
319 /* Reset screen state. */
320 void
321 screen_write_reset(struct screen_write_ctx *ctx)
322 {
323 struct screen *s = ctx->s;
324
325 screen_reset_tabs(s);
326 screen_write_scrollregion(ctx, 0, screen_size_y(s) - 1);
327
328 s->mode = MODE_CURSOR|MODE_WRAP;
329 if (options_get_number(global_options, "extended-keys") == 2)
330 s->mode |= MODE_KEXTENDED;
331
332 screen_write_clearscreen(ctx, 8);
333 screen_write_set_cursor(ctx, 0, 0);
334 }
335
336 /* Write character. */
337 void
338 screen_write_putc(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
339 u_char ch)
340 {
341 struct grid_cell gc;
342
343 memcpy(&gc, gcp, sizeof gc);
344
345 utf8_set(&gc.data, ch);
346 screen_write_cell(ctx, &gc);
347 }
348
349 /* Calculate string length. */
350 size_t
351 screen_write_strlen(const char *fmt, ...)
352 {
353 va_list ap;
354 char *msg;
355 struct utf8_data ud;
356 u_char *ptr;
357 size_t left, size = 0;
358 enum utf8_state more;
359
360 va_start(ap, fmt);
361 xvasprintf(&msg, fmt, ap);
362 va_end(ap);
363
364 ptr = msg;
365 while (*ptr != '\0') {
366 if (*ptr > 0x7f && utf8_open(&ud, *ptr) == UTF8_MORE) {
367 ptr++;
368
369 left = strlen(ptr);
370 if (left < (size_t)ud.size - 1)
371 break;
372 while ((more = utf8_append(&ud, *ptr)) == UTF8_MORE)
373 ptr++;
374 ptr++;
375
376 if (more == UTF8_DONE)
377 size += ud.width;
378 } else {
379 if (*ptr > 0x1f && *ptr < 0x7f)
380 size++;
381 ptr++;
382 }
383 }
384
385 free(msg);
386 return (size);
387 }
388
389 /* Write string wrapped over lines. */
390 int
391 screen_write_text(struct screen_write_ctx *ctx, u_int cx, u_int width,
392 u_int lines, int more, const struct grid_cell *gcp, const char *fmt, ...)
393 {
394 struct screen *s = ctx->s;
395 va_list ap;
396 char *tmp;
397 u_int cy = s->cy, i, end, next, idx = 0, at, left;
398 struct utf8_data *text;
399 struct grid_cell gc;
400
401 memcpy(&gc, gcp, sizeof gc);
402
403 va_start(ap, fmt);
404 xvasprintf(&tmp, fmt, ap);
405 va_end(ap);
406
407 text = utf8_fromcstr(tmp);
408 free(tmp);
409
410 left = (cx + width) - s->cx;
411 for (;;) {
412 /* Find the end of what can fit on the line. */
413 at = 0;
414 for (end = idx; text[end].size != 0; end++) {
415 if (text[end].size == 1 && text[end].data[0] == '\n')
416 break;
417 if (at + text[end].width > left)
418 break;
419 at += text[end].width;
420 }
421
422 /*
423 * If we're on a space, that's the end. If not, walk back to
424 * try and find one.
425 */
426 if (text[end].size == 0)
427 next = end;
428 else if (text[end].size == 1 && text[end].data[0] == '\n')
429 next = end + 1;
430 else if (text[end].size == 1 && text[end].data[0] == ' ')
431 next = end + 1;
432 else {
433 for (i = end; i > idx; i--) {
434 if (text[i].size == 1 && text[i].data[0] == ' ')
435 break;
436 }
437 if (i != idx) {
438 next = i + 1;
439 end = i;
440 } else
441 next = end;
442 }
443
444 /* Print the line. */
445 for (i = idx; i < end; i++) {
446 utf8_copy(&gc.data, &text[i]);
447 screen_write_cell(ctx, &gc);
448 }
449
450 /* If at the bottom, stop. */
451 idx = next;
452 if (s->cy == cy + lines - 1 || text[idx].size == 0)
453 break;
454
455 screen_write_cursormove(ctx, cx, s->cy + 1, 0);
456 left = width;
457 }
458
459 /*
460 * Fail if on the last line and there is more to come or at the end, or
461 * if the text was not entirely consumed.
462 */
463 if ((s->cy == cy + lines - 1 && (!more || s->cx == cx + width)) ||
464 text[idx].size != 0) {
465 free(text);
466 return (0);
467 }
468 free(text);
469
470 /*
471 * If no more to come, move to the next line. Otherwise, leave on
472 * the same line (except if at the end).
473 */
474 if (!more || s->cx == cx + width)
475 screen_write_cursormove(ctx, cx, s->cy + 1, 0);
476 return (1);
477 }
478
479 /* Write simple string (no maximum length). */
480 void
481 screen_write_puts(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
482 const char *fmt, ...)
483 {
484 va_list ap;
485
486 va_start(ap, fmt);
487 screen_write_vnputs(ctx, -1, gcp, fmt, ap);
488 va_end(ap);
489 }
490
491 /* Write string with length limit (-1 for unlimited). */
492 void
493 screen_write_nputs(struct screen_write_ctx *ctx, ssize_t maxlen,
494 const struct grid_cell *gcp, const char *fmt, ...)
495 {
496 va_list ap;
497
498 va_start(ap, fmt);
499 screen_write_vnputs(ctx, maxlen, gcp, fmt, ap);
500 va_end(ap);
501 }
502
503 void
504 screen_write_vnputs(struct screen_write_ctx *ctx, ssize_t maxlen,
505 const struct grid_cell *gcp, const char *fmt, va_list ap)
506 {
507 struct grid_cell gc;
508 struct utf8_data *ud = &gc.data;
509 char *msg;
510 u_char *ptr;
511 size_t left, size = 0;
512 enum utf8_state more;
513
514 memcpy(&gc, gcp, sizeof gc);
515 xvasprintf(&msg, fmt, ap);
516
517 ptr = msg;
518 while (*ptr != '\0') {
519 if (*ptr > 0x7f && utf8_open(ud, *ptr) == UTF8_MORE) {
520 ptr++;
521
522 left = strlen(ptr);
523 if (left < (size_t)ud->size - 1)
524 break;
525 while ((more = utf8_append(ud, *ptr)) == UTF8_MORE)
526 ptr++;
527 ptr++;
528
529 if (more != UTF8_DONE)
530 continue;
531 if (maxlen > 0 && size + ud->width > (size_t)maxlen) {
532 while (size < (size_t)maxlen) {
533 screen_write_putc(ctx, &gc, ' ');
534 size++;
535 }
536 break;
537 }
538 size += ud->width;
539 screen_write_cell(ctx, &gc);
540 } else {
541 if (maxlen > 0 && size + 1 > (size_t)maxlen)
542 break;
543
544 if (*ptr == '\001')
545 gc.attr ^= GRID_ATTR_CHARSET;
546 else if (*ptr == '\n') {
547 screen_write_linefeed(ctx, 0, 8);
548 screen_write_carriagereturn(ctx);
549 } else if (*ptr > 0x1f && *ptr < 0x7f) {
550 size++;
551 screen_write_putc(ctx, &gc, *ptr);
552 }
553 ptr++;
554 }
555 }
556
557 free(msg);
558 }
559
560 /*
561 * Copy from another screen but without the selection stuff. Assumes the target
562 * region is already big enough.
563 */
564 void
565 screen_write_fast_copy(struct screen_write_ctx *ctx, struct screen *src,
566 u_int px, u_int py, u_int nx, u_int ny)
567 {
568 struct screen *s = ctx->s;
569 struct grid *gd = src->grid;
570 struct grid_cell gc;
571 u_int xx, yy, cx, cy;
572
573 if (nx == 0 || ny == 0)
574 return;
575
576 cy = s->cy;
577 for (yy = py; yy < py + ny; yy++) {
578 if (yy >= gd->hsize + gd->sy)
579 break;
580 cx = s->cx;
581 for (xx = px; xx < px + nx; xx++) {
582 if (xx >= grid_get_line(gd, yy)->cellsize)
583 break;
584 grid_get_cell(gd, xx, yy, &gc);
585 if (xx + gc.data.width > px + nx)
586 break;
587 grid_view_set_cell(ctx->s->grid, cx, cy, &gc);
588 cx++;
589 }
590 cy++;
591 }
592 }
593
594 /* Select character set for drawing border lines. */
595 static void
596 screen_write_box_border_set(enum box_lines lines, int cell_type,
597 struct grid_cell *gc)
598 {
599 switch (lines) {
600 case BOX_LINES_NONE:
601 break;
602 case BOX_LINES_DOUBLE:
603 gc->attr &= ~GRID_ATTR_CHARSET;
604 utf8_copy(&gc->data, tty_acs_double_borders(cell_type));
605 break;
606 case BOX_LINES_HEAVY:
607 gc->attr &= ~GRID_ATTR_CHARSET;
608 utf8_copy(&gc->data, tty_acs_heavy_borders(cell_type));
609 break;
610 case BOX_LINES_ROUNDED:
611 gc->attr &= ~GRID_ATTR_CHARSET;
612 utf8_copy(&gc->data, tty_acs_rounded_borders(cell_type));
613 break;
614 case BOX_LINES_SIMPLE:
615 gc->attr &= ~GRID_ATTR_CHARSET;
616 utf8_set(&gc->data, SIMPLE_BORDERS[cell_type]);
617 break;
618 case BOX_LINES_PADDED:
619 gc->attr &= ~GRID_ATTR_CHARSET;
620 utf8_set(&gc->data, PADDED_BORDERS[cell_type]);
621 break;
622 case BOX_LINES_SINGLE:
623 case BOX_LINES_DEFAULT:
624 gc->attr |= GRID_ATTR_CHARSET;
625 utf8_set(&gc->data, CELL_BORDERS[cell_type]);
626 break;
627 }
628 }
629
630 /* Draw a horizontal line on screen. */
631 void
632 screen_write_hline(struct screen_write_ctx *ctx, u_int nx, int left, int right,
633 enum box_lines lines, const struct grid_cell *border_gc)
634 {
635 struct screen *s = ctx->s;
636 struct grid_cell gc;
637 u_int cx, cy, i;
638
639 cx = s->cx;
640 cy = s->cy;
641
642 if (border_gc != NULL)
643 memcpy(&gc, border_gc, sizeof gc);
644 else
645 memcpy(&gc, &grid_default_cell, sizeof gc);
646 gc.attr |= GRID_ATTR_CHARSET;
647
648 if (left)
649 screen_write_box_border_set(lines, CELL_LEFTJOIN, &gc);
650 else
651 screen_write_box_border_set(lines, CELL_LEFTRIGHT, &gc);
652 screen_write_cell(ctx, &gc);
653
654 screen_write_box_border_set(lines, CELL_LEFTRIGHT, &gc);
655 for (i = 1; i < nx - 1; i++)
656 screen_write_cell(ctx, &gc);
657
658 if (right)
659 screen_write_box_border_set(lines, CELL_RIGHTJOIN, &gc);
660 else
661 screen_write_box_border_set(lines, CELL_LEFTRIGHT, &gc);
662 screen_write_cell(ctx, &gc);
663
664 screen_write_set_cursor(ctx, cx, cy);
665 }
666
667 /* Draw a vertical line on screen. */
668 void
669 screen_write_vline(struct screen_write_ctx *ctx, u_int ny, int top, int bottom)
670 {
671 struct screen *s = ctx->s;
672 struct grid_cell gc;
673 u_int cx, cy, i;
674
675 cx = s->cx;
676 cy = s->cy;
677
678 memcpy(&gc, &grid_default_cell, sizeof gc);
679 gc.attr |= GRID_ATTR_CHARSET;
680
681 screen_write_putc(ctx, &gc, top ? 'w' : 'x');
682 for (i = 1; i < ny - 1; i++) {
683 screen_write_set_cursor(ctx, cx, cy + i);
684 screen_write_putc(ctx, &gc, 'x');
685 }
686 screen_write_set_cursor(ctx, cx, cy + ny - 1);
687 screen_write_putc(ctx, &gc, bottom ? 'v' : 'x');
688
689 screen_write_set_cursor(ctx, cx, cy);
690 }
691
692 /* Draw a menu on screen. */
693 void
694 screen_write_menu(struct screen_write_ctx *ctx, struct menu *menu, int choice,
695 enum box_lines lines, const struct grid_cell *menu_gc,
696 const struct grid_cell *border_gc, const struct grid_cell *choice_gc)
697 {
698 struct screen *s = ctx->s;
699 struct grid_cell default_gc;
700 const struct grid_cell *gc = &default_gc;
701 u_int cx, cy, i, j, width = menu->width;
702 const char *name;
703
704 cx = s->cx;
705 cy = s->cy;
706
707 memcpy(&default_gc, menu_gc, sizeof default_gc);
708
709 screen_write_box(ctx, menu->width + 4, menu->count + 2, lines,
710 border_gc, menu->title);
711
712 for (i = 0; i < menu->count; i++) {
713 name = menu->items[i].name;
714 if (name == NULL) {
715 screen_write_cursormove(ctx, cx, cy + 1 + i, 0);
716 screen_write_hline(ctx, width + 4, 1, 1, lines,
717 border_gc);
718 continue;
719 }
720
721 if (choice >= 0 && i == (u_int)choice && *name != '-')
722 gc = choice_gc;
723
724 screen_write_cursormove(ctx, cx + 1, cy + 1 + i, 0);
725 for (j = 0; j < width + 2; j++)
726 screen_write_putc(ctx, gc, ' ');
727
728 screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0);
729 if (*name == '-') {
730 default_gc.attr |= GRID_ATTR_DIM;
731 format_draw(ctx, gc, width, name + 1, NULL, 0);
732 default_gc.attr &= ~GRID_ATTR_DIM;
733 continue;
734 }
735
736 format_draw(ctx, gc, width, name, NULL, gc == choice_gc);
737 gc = &default_gc;
738 }
739
740 screen_write_set_cursor(ctx, cx, cy);
741 }
742
743 /* Draw a box on screen. */
744 void
745 screen_write_box(struct screen_write_ctx *ctx, u_int nx, u_int ny,
746 enum box_lines lines, const struct grid_cell *gcp, const char *title)
747 {
748 struct screen *s = ctx->s;
749 struct grid_cell gc;
750 u_int cx, cy, i;
751
752 cx = s->cx;
753 cy = s->cy;
754
755 if (gcp != NULL)
756 memcpy(&gc, gcp, sizeof gc);
757 else
758 memcpy(&gc, &grid_default_cell, sizeof gc);
759
760 gc.attr |= GRID_ATTR_CHARSET;
761 gc.flags |= GRID_FLAG_NOPALETTE;
762
763 /* Draw top border */
764 screen_write_box_border_set(lines, CELL_TOPLEFT, &gc);
765 screen_write_cell(ctx, &gc);
766 screen_write_box_border_set(lines, CELL_LEFTRIGHT, &gc);
767 for (i = 1; i < nx - 1; i++)
768 screen_write_cell(ctx, &gc);
769 screen_write_box_border_set(lines, CELL_TOPRIGHT, &gc);
770 screen_write_cell(ctx, &gc);
771
772 /* Draw bottom border */
773 screen_write_set_cursor(ctx, cx, cy + ny - 1);
774 screen_write_box_border_set(lines, CELL_BOTTOMLEFT, &gc);
775 screen_write_cell(ctx, &gc);
776 screen_write_box_border_set(lines, CELL_LEFTRIGHT, &gc);
777 for (i = 1; i < nx - 1; i++)
778 screen_write_cell(ctx, &gc);
779 screen_write_box_border_set(lines, CELL_BOTTOMRIGHT, &gc);
780 screen_write_cell(ctx, &gc);
781
782 /* Draw sides */
783 screen_write_box_border_set(lines, CELL_TOPBOTTOM, &gc);
784 for (i = 1; i < ny - 1; i++) {
785 /* left side */
786 screen_write_set_cursor(ctx, cx, cy + i);
787 screen_write_cell(ctx, &gc);
788 /* right side */
789 screen_write_set_cursor(ctx, cx + nx - 1, cy + i);
790 screen_write_cell(ctx, &gc);
791 }
792
793 if (title != NULL) {
794 gc.attr &= ~GRID_ATTR_CHARSET;
795 screen_write_cursormove(ctx, cx + 2, cy, 0);
796 format_draw(ctx, &gc, nx - 4, title, NULL, 0);
797 }
798
799 screen_write_set_cursor(ctx, cx, cy);
800 }
801
802 /*
803 * Write a preview version of a window. Assumes target area is big enough and
804 * already cleared.
805 */
806 void
807 screen_write_preview(struct screen_write_ctx *ctx, struct screen *src, u_int nx,
808 u_int ny)
809 {
810 struct screen *s = ctx->s;
811 struct grid_cell gc;
812 u_int cx, cy, px, py;
813
814 cx = s->cx;
815 cy = s->cy;
816
817 /*
818 * If the cursor is on, pick the area around the cursor, otherwise use
819 * the top left.
820 */
821 if (src->mode & MODE_CURSOR) {
822 px = src->cx;
823 if (px < nx / 3)
824 px = 0;
825 else
826 px = px - nx / 3;
827 if (px + nx > screen_size_x(src)) {
828 if (nx > screen_size_x(src))
829 px = 0;
830 else
831 px = screen_size_x(src) - nx;
832 }
833 py = src->cy;
834 if (py < ny / 3)
835 py = 0;
836 else
837 py = py - ny / 3;
838 if (py + ny > screen_size_y(src)) {
839 if (ny > screen_size_y(src))
840 py = 0;
841 else
842 py = screen_size_y(src) - ny;
843 }
844 } else {
845 px = 0;
846 py = 0;
847 }
848
849 screen_write_fast_copy(ctx, src, px, src->grid->hsize + py, nx, ny);
850
851 if (src->mode & MODE_CURSOR) {
852 grid_view_get_cell(src->grid, src->cx, src->cy, &gc);
853 gc.attr |= GRID_ATTR_REVERSE;
854 screen_write_set_cursor(ctx, cx + (src->cx - px),
855 cy + (src->cy - py));
856 screen_write_cell(ctx, &gc);
857 }
858 }
859
860 /* Set a mode. */
861 void
862 screen_write_mode_set(struct screen_write_ctx *ctx, int mode)
863 {
864 struct screen *s = ctx->s;
865
866 s->mode |= mode;
867
868 if (log_get_level() != 0)
869 log_debug("%s: %s", __func__, screen_mode_to_string(mode));
870 }
871
872 /* Clear a mode. */
873 void
874 screen_write_mode_clear(struct screen_write_ctx *ctx, int mode)
875 {
876 struct screen *s = ctx->s;
877
878 s->mode &= ~mode;
879
880 if (log_get_level() != 0)
881 log_debug("%s: %s", __func__, screen_mode_to_string(mode));
882 }
883
884 /* Cursor up by ny. */
885 void
886 screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
887 {
888 struct screen *s = ctx->s;
889 u_int cx = s->cx, cy = s->cy;
890
891 if (ny == 0)
892 ny = 1;
893
894 if (cy < s->rupper) {
895 /* Above region. */
896 if (ny > cy)
897 ny = cy;
898 } else {
899 /* Below region. */
900 if (ny > cy - s->rupper)
901 ny = cy - s->rupper;
902 }
903 if (cx == screen_size_x(s))
904 cx--;
905
906 cy -= ny;
907
908 screen_write_set_cursor(ctx, cx, cy);
909 }
910
911 /* Cursor down by ny. */
912 void
913 screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
914 {
915 struct screen *s = ctx->s;
916 u_int cx = s->cx, cy = s->cy;
917
918 if (ny == 0)
919 ny = 1;
920
921 if (cy > s->rlower) {
922 /* Below region. */
923 if (ny > screen_size_y(s) - 1 - cy)
924 ny = screen_size_y(s) - 1 - cy;
925 } else {
926 /* Above region. */
927 if (ny > s->rlower - cy)
928 ny = s->rlower - cy;
929 }
930 if (cx == screen_size_x(s))
931 cx--;
932 else if (ny == 0)
933 return;
934
935 cy += ny;
936
937 screen_write_set_cursor(ctx, cx, cy);
938 }
939
940 /* Cursor right by nx. */
941 void
942 screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx)
943 {
944 struct screen *s = ctx->s;
945 u_int cx = s->cx, cy = s->cy;
946
947 if (nx == 0)
948 nx = 1;
949
950 if (nx > screen_size_x(s) - 1 - cx)
951 nx = screen_size_x(s) - 1 - cx;
952 if (nx == 0)
953 return;
954
955 cx += nx;
956
957 screen_write_set_cursor(ctx, cx, cy);
958 }
959
960 /* Cursor left by nx. */
961 void
962 screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
963 {
964 struct screen *s = ctx->s;
965 u_int cx = s->cx, cy = s->cy;
966
967 if (nx == 0)
968 nx = 1;
969
970 if (nx > cx)
971 nx = cx;
972 if (nx == 0)
973 return;
974
975 cx -= nx;
976
977 screen_write_set_cursor(ctx, cx, cy);
978 }
979
980 /* Backspace; cursor left unless at start of wrapped line when can move up. */
981 void
982 screen_write_backspace(struct screen_write_ctx *ctx)
983 {
984 struct screen *s = ctx->s;
985 struct grid_line *gl;
986 u_int cx = s->cx, cy = s->cy;
987
988 if (cx == 0) {
989 if (cy == 0)
990 return;
991 gl = grid_get_line(s->grid, s->grid->hsize + cy - 1);
992 if (gl->flags & GRID_LINE_WRAPPED) {
993 cy--;
994 cx = screen_size_x(s) - 1;
995 }
996 } else
997 cx--;
998
999 screen_write_set_cursor(ctx, cx, cy);
1000 }
1001
1002 /* VT100 alignment test. */
1003 void
1004 screen_write_alignmenttest(struct screen_write_ctx *ctx)
1005 {
1006 struct screen *s = ctx->s;
1007 struct tty_ctx ttyctx;
1008 struct grid_cell gc;
1009 u_int xx, yy;
1010
1011 memcpy(&gc, &grid_default_cell, sizeof gc);
1012 utf8_set(&gc.data, 'E');
1013
1014 for (yy = 0; yy < screen_size_y(s); yy++) {
1015 for (xx = 0; xx < screen_size_x(s); xx++)
1016 grid_view_set_cell(s->grid, xx, yy, &gc);
1017 }
1018
1019 screen_write_set_cursor(ctx, 0, 0);
1020
1021 s->rupper = 0;
1022 s->rlower = screen_size_y(s) - 1;
1023
1024 screen_write_initctx(ctx, &ttyctx, 1);
1025
1026 screen_write_collect_clear(ctx, 0, screen_size_y(s) - 1);
1027 tty_write(tty_cmd_alignmenttest, &ttyctx);
1028 }
1029
1030 /* Insert nx characters. */
1031 void
1032 screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
1033 {
1034 struct screen *s = ctx->s;
1035 struct tty_ctx ttyctx;
1036
1037 if (nx == 0)
1038 nx = 1;
1039
1040 if (nx > screen_size_x(s) - s->cx)
1041 nx = screen_size_x(s) - s->cx;
1042 if (nx == 0)
1043 return;
1044
1045 if (s->cx > screen_size_x(s) - 1)
1046 return;
1047
1048 screen_write_initctx(ctx, &ttyctx, 0);
1049 ttyctx.bg = bg;
1050
1051 grid_view_insert_cells(s->grid, s->cx, s->cy, nx, bg);
1052
1053 screen_write_collect_flush(ctx, 0, __func__);
1054 ttyctx.num = nx;
1055 tty_write(tty_cmd_insertcharacter, &ttyctx);
1056 }
1057
1058 /* Delete nx characters. */
1059 void
1060 screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
1061 {
1062 struct screen *s = ctx->s;
1063 struct tty_ctx ttyctx;
1064
1065 if (nx == 0)
1066 nx = 1;
1067
1068 if (nx > screen_size_x(s) - s->cx)
1069 nx = screen_size_x(s) - s->cx;
1070 if (nx == 0)
1071 return;
1072
1073 if (s->cx > screen_size_x(s) - 1)
1074 return;
1075
1076 screen_write_initctx(ctx, &ttyctx, 0);
1077 ttyctx.bg = bg;
1078
1079 grid_view_delete_cells(s->grid, s->cx, s->cy, nx, bg);
1080
1081 screen_write_collect_flush(ctx, 0, __func__);
1082 ttyctx.num = nx;
1083 tty_write(tty_cmd_deletecharacter, &ttyctx);
1084 }
1085
1086 /* Clear nx characters. */
1087 void
1088 screen_write_clearcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
1089 {
1090 struct screen *s = ctx->s;
1091 struct tty_ctx ttyctx;
1092
1093 if (nx == 0)
1094 nx = 1;
1095
1096 if (nx > screen_size_x(s) - s->cx)
1097 nx = screen_size_x(s) - s->cx;
1098 if (nx == 0)
1099 return;
1100
1101 if (s->cx > screen_size_x(s) - 1)
1102 return;
1103
1104 screen_write_initctx(ctx, &ttyctx, 0);
1105 ttyctx.bg = bg;
1106
1107 grid_view_clear(s->grid, s->cx, s->cy, nx, 1, bg);
1108
1109 screen_write_collect_flush(ctx, 0, __func__);
1110 ttyctx.num = nx;
1111 tty_write(tty_cmd_clearcharacter, &ttyctx);
1112 }
1113
1114 /* Insert ny lines. */
1115 void
1116 screen_write_insertline(struct screen_write_ctx *ctx, u_int ny, u_int bg)
1117 {
1118 struct screen *s = ctx->s;
1119 struct grid *gd = s->grid;
1120 struct tty_ctx ttyctx;
1121
1122 if (ny == 0)
1123 ny = 1;
1124
1125 if (s->cy < s->rupper || s->cy > s->rlower) {
1126 if (ny > screen_size_y(s) - s->cy)
1127 ny = screen_size_y(s) - s->cy;
1128 if (ny == 0)
1129 return;
1130
1131 screen_write_initctx(ctx, &ttyctx, 1);
1132 ttyctx.bg = bg;
1133
1134 grid_view_insert_lines(gd, s->cy, ny, bg);
1135
1136 screen_write_collect_flush(ctx, 0, __func__);
1137 ttyctx.num = ny;
1138 tty_write(tty_cmd_insertline, &ttyctx);
1139 return;
1140 }
1141
1142 if (ny > s->rlower + 1 - s->cy)
1143 ny = s->rlower + 1 - s->cy;
1144 if (ny == 0)
1145 return;
1146
1147 screen_write_initctx(ctx, &ttyctx, 1);
1148 ttyctx.bg = bg;
1149
1150 if (s->cy < s->rupper || s->cy > s->rlower)
1151 grid_view_insert_lines(gd, s->cy, ny, bg);
1152 else
1153 grid_view_insert_lines_region(gd, s->rlower, s->cy, ny, bg);
1154
1155 screen_write_collect_flush(ctx, 0, __func__);
1156
1157 ttyctx.num = ny;
1158 tty_write(tty_cmd_insertline, &ttyctx);
1159 }
1160
1161 /* Delete ny lines. */
1162 void
1163 screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny, u_int bg)
1164 {
1165 struct screen *s = ctx->s;
1166 struct grid *gd = s->grid;
1167 struct tty_ctx ttyctx;
1168
1169 if (ny == 0)
1170 ny = 1;
1171
1172 if (s->cy < s->rupper || s->cy > s->rlower) {
1173 if (ny > screen_size_y(s) - s->cy)
1174 ny = screen_size_y(s) - s->cy;
1175 if (ny == 0)
1176 return;
1177
1178 screen_write_initctx(ctx, &ttyctx, 1);
1179 ttyctx.bg = bg;
1180
1181 grid_view_delete_lines(gd, s->cy, ny, bg);
1182
1183 screen_write_collect_flush(ctx, 0, __func__);
1184 ttyctx.num = ny;
1185 tty_write(tty_cmd_deleteline, &ttyctx);
1186 return;
1187 }
1188
1189 if (ny > s->rlower + 1 - s->cy)
1190 ny = s->rlower + 1 - s->cy;
1191 if (ny == 0)
1192 return;
1193
1194 screen_write_initctx(ctx, &ttyctx, 1);
1195 ttyctx.bg = bg;
1196
1197 if (s->cy < s->rupper || s->cy > s->rlower)
1198 grid_view_delete_lines(gd, s->cy, ny, bg);
1199 else
1200 grid_view_delete_lines_region(gd, s->rlower, s->cy, ny, bg);
1201
1202 screen_write_collect_flush(ctx, 0, __func__);
1203 ttyctx.num = ny;
1204 tty_write(tty_cmd_deleteline, &ttyctx);
1205 }
1206
1207 /* Clear line at cursor. */
1208 void
1209 screen_write_clearline(struct screen_write_ctx *ctx, u_int bg)
1210 {
1211 struct screen *s = ctx->s;
1212 struct grid_line *gl;
1213 u_int sx = screen_size_x(s);
1214 struct screen_write_citem *ci = ctx->item;
1215
1216 gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
1217 if (gl->cellsize == 0 && COLOUR_DEFAULT(bg))
1218 return;
1219
1220 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
1221
1222 screen_write_collect_clear(ctx, s->cy, 1);
1223 ci->x = 0;
1224 ci->used = sx;
1225 ci->type = CLEAR;
1226 ci->bg = bg;
1227 TAILQ_INSERT_TAIL(&ctx->s->write_list[s->cy].items, ci, entry);
1228 ctx->item = screen_write_get_citem();
1229 }
1230
1231 /* Clear to end of line from cursor. */
1232 void
1233 screen_write_clearendofline(struct screen_write_ctx *ctx, u_int bg)
1234 {
1235 struct screen *s = ctx->s;
1236 struct grid_line *gl;
1237 u_int sx = screen_size_x(s);
1238 struct screen_write_citem *ci = ctx->item, *before;
1239
1240 if (s->cx == 0) {
1241 screen_write_clearline(ctx, bg);
1242 return;
1243 }
1244
1245 gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
1246 if (s->cx > sx - 1 || (s->cx >= gl->cellsize && COLOUR_DEFAULT(bg)))
1247 return;
1248
1249 grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1, bg);
1250
1251 before = screen_write_collect_trim(ctx, s->cy, s->cx, sx - s->cx, NULL);
1252 ci->x = s->cx;
1253 ci->used = sx - s->cx;
1254 ci->type = CLEAR;
1255 ci->bg = bg;
1256 if (before == NULL)
1257 TAILQ_INSERT_TAIL(&ctx->s->write_list[s->cy].items, ci, entry);
1258 else
1259 TAILQ_INSERT_BEFORE(before, ci, entry);
1260 ctx->item = screen_write_get_citem();
1261 }
1262
1263 /* Clear to start of line from cursor. */
1264 void
1265 screen_write_clearstartofline(struct screen_write_ctx *ctx, u_int bg)
1266 {
1267 struct screen *s = ctx->s;
1268 u_int sx = screen_size_x(s);
1269 struct screen_write_citem *ci = ctx->item, *before;
1270
1271 if (s->cx >= sx - 1) {
1272 screen_write_clearline(ctx, bg);
1273 return;
1274 }
1275
1276 if (s->cx > sx - 1)
1277 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
1278 else
1279 grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg);
1280
1281 before = screen_write_collect_trim(ctx, s->cy, 0, s->cx + 1, NULL);
1282 ci->x = 0;
1283 ci->used = s->cx + 1;
1284 ci->type = CLEAR;
1285 ci->bg = bg;
1286 if (before == NULL)
1287 TAILQ_INSERT_TAIL(&ctx->s->write_list[s->cy].items, ci, entry);
1288 else
1289 TAILQ_INSERT_BEFORE(before, ci, entry);
1290 ctx->item = screen_write_get_citem();
1291 }
1292
1293 /* Move cursor to px,py. */
1294 void
1295 screen_write_cursormove(struct screen_write_ctx *ctx, int px, int py,
1296 int origin)
1297 {
1298 struct screen *s = ctx->s;
1299
1300 if (origin && py != -1 && (s->mode & MODE_ORIGIN)) {
1301 if ((u_int)py > s->rlower - s->rupper)
1302 py = s->rlower;
1303 else
1304 py += s->rupper;
1305 }
1306
1307 if (px != -1 && (u_int)px > screen_size_x(s) - 1)
1308 px = screen_size_x(s) - 1;
1309 if (py != -1 && (u_int)py > screen_size_y(s) - 1)
1310 py = screen_size_y(s) - 1;
1311
1312 log_debug("%s: from %u,%u to %u,%u", __func__, s->cx, s->cy, px, py);
1313 screen_write_set_cursor(ctx, px, py);
1314 }
1315
1316 /* Reverse index (up with scroll). */
1317 void
1318 screen_write_reverseindex(struct screen_write_ctx *ctx, u_int bg)
1319 {
1320 struct screen *s = ctx->s;
1321 struct tty_ctx ttyctx;
1322
1323 if (s->cy == s->rupper) {
1324 grid_view_scroll_region_down(s->grid, s->rupper, s->rlower, bg);
1325 screen_write_collect_flush(ctx, 0, __func__);
1326
1327 screen_write_initctx(ctx, &ttyctx, 1);
1328 ttyctx.bg = bg;
1329
1330 tty_write(tty_cmd_reverseindex, &ttyctx);
1331 } else if (s->cy > 0)
1332 screen_write_set_cursor(ctx, -1, s->cy - 1);
1333
1334 }
1335
1336 /* Set scroll region. */
1337 void
1338 screen_write_scrollregion(struct screen_write_ctx *ctx, u_int rupper,
1339 u_int rlower)
1340 {
1341 struct screen *s = ctx->s;
1342
1343 if (rupper > screen_size_y(s) - 1)
1344 rupper = screen_size_y(s) - 1;
1345 if (rlower > screen_size_y(s) - 1)
1346 rlower = screen_size_y(s) - 1;
1347 if (rupper >= rlower) /* cannot be one line */
1348 return;
1349
1350 screen_write_collect_flush(ctx, 0, __func__);
1351
1352 /* Cursor moves to top-left. */
1353 screen_write_set_cursor(ctx, 0, 0);
1354
1355 s->rupper = rupper;
1356 s->rlower = rlower;
1357 }
1358
1359 /* Line feed. */
1360 void
1361 screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped, u_int bg)
1362 {
1363 struct screen *s = ctx->s;
1364 struct grid *gd = s->grid;
1365 struct grid_line *gl;
1366
1367 gl = grid_get_line(gd, gd->hsize + s->cy);
1368 if (wrapped)
1369 gl->flags |= GRID_LINE_WRAPPED;
1370
1371 log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy,
1372 s->rupper, s->rlower);
1373
1374 if (bg != ctx->bg) {
1375 screen_write_collect_flush(ctx, 1, __func__);
1376 ctx->bg = bg;
1377 }
1378
1379 if (s->cy == s->rlower) {
1380 grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg);
1381 screen_write_collect_scroll(ctx, bg);
1382 ctx->scrolled++;
1383 } else if (s->cy < screen_size_y(s) - 1)
1384 screen_write_set_cursor(ctx, -1, s->cy + 1);
1385 }
1386
1387 /* Scroll up. */
1388 void
1389 screen_write_scrollup(struct screen_write_ctx *ctx, u_int lines, u_int bg)
1390 {
1391 struct screen *s = ctx->s;
1392 struct grid *gd = s->grid;
1393 u_int i;
1394
1395 if (lines == 0)
1396 lines = 1;
1397 else if (lines > s->rlower - s->rupper + 1)
1398 lines = s->rlower - s->rupper + 1;
1399
1400 if (bg != ctx->bg) {
1401 screen_write_collect_flush(ctx, 1, __func__);
1402 ctx->bg = bg;
1403 }
1404
1405 for (i = 0; i < lines; i++) {
1406 grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg);
1407 screen_write_collect_scroll(ctx, bg);
1408 }
1409 ctx->scrolled += lines;
1410 }
1411
1412 /* Scroll down. */
1413 void
1414 screen_write_scrolldown(struct screen_write_ctx *ctx, u_int lines, u_int bg)
1415 {
1416 struct screen *s = ctx->s;
1417 struct grid *gd = s->grid;
1418 struct tty_ctx ttyctx;
1419 u_int i;
1420
1421 screen_write_initctx(ctx, &ttyctx, 1);
1422 ttyctx.bg = bg;
1423
1424 if (lines == 0)
1425 lines = 1;
1426 else if (lines > s->rlower - s->rupper + 1)
1427 lines = s->rlower - s->rupper + 1;
1428
1429 for (i = 0; i < lines; i++)
1430 grid_view_scroll_region_down(gd, s->rupper, s->rlower, bg);
1431
1432 screen_write_collect_flush(ctx, 0, __func__);
1433 ttyctx.num = lines;
1434 tty_write(tty_cmd_scrolldown, &ttyctx);
1435 }
1436
1437 /* Carriage return (cursor to start of line). */
1438 void
1439 screen_write_carriagereturn(struct screen_write_ctx *ctx)
1440 {
1441 screen_write_set_cursor(ctx, 0, -1);
1442 }
1443
1444 /* Clear to end of screen from cursor. */
1445 void
1446 screen_write_clearendofscreen(struct screen_write_ctx *ctx, u_int bg)
1447 {
1448 struct screen *s = ctx->s;
1449 struct grid *gd = s->grid;
1450 struct tty_ctx ttyctx;
1451 u_int sx = screen_size_x(s), sy = screen_size_y(s);
1452
1453 screen_write_initctx(ctx, &ttyctx, 1);
1454 ttyctx.bg = bg;
1455
1456 /* Scroll into history if it is enabled and clearing entire screen. */
1457 if (s->cx == 0 &&
1458 s->cy == 0 &&
1459 (gd->flags & GRID_HISTORY) &&
1460 ctx->wp != NULL &&
1461 options_get_number(ctx->wp->options, "scroll-on-clear"))
1462 grid_view_clear_history(gd, bg);
1463 else {
1464 if (s->cx <= sx - 1)
1465 grid_view_clear(gd, s->cx, s->cy, sx - s->cx, 1, bg);
1466 grid_view_clear(gd, 0, s->cy + 1, sx, sy - (s->cy + 1), bg);
1467 }
1468
1469 screen_write_collect_clear(ctx, s->cy + 1, sy - (s->cy + 1));
1470 screen_write_collect_flush(ctx, 0, __func__);
1471 tty_write(tty_cmd_clearendofscreen, &ttyctx);
1472 }
1473
1474 /* Clear to start of screen. */
1475 void
1476 screen_write_clearstartofscreen(struct screen_write_ctx *ctx, u_int bg)
1477 {
1478 struct screen *s = ctx->s;
1479 struct tty_ctx ttyctx;
1480 u_int sx = screen_size_x(s);
1481
1482 screen_write_initctx(ctx, &ttyctx, 1);
1483 ttyctx.bg = bg;
1484
1485 if (s->cy > 0)
1486 grid_view_clear(s->grid, 0, 0, sx, s->cy, bg);
1487 if (s->cx > sx - 1)
1488 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
1489 else
1490 grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg);
1491
1492 screen_write_collect_clear(ctx, 0, s->cy);
1493 screen_write_collect_flush(ctx, 0, __func__);
1494 tty_write(tty_cmd_clearstartofscreen, &ttyctx);
1495 }
1496
1497 /* Clear entire screen. */
1498 void
1499 screen_write_clearscreen(struct screen_write_ctx *ctx, u_int bg)
1500 {
1501 struct screen *s = ctx->s;
1502 struct tty_ctx ttyctx;
1503 u_int sx = screen_size_x(s), sy = screen_size_y(s);
1504
1505 screen_write_initctx(ctx, &ttyctx, 1);
1506 ttyctx.bg = bg;
1507
1508 /* Scroll into history if it is enabled. */
1509 if ((s->grid->flags & GRID_HISTORY) &&
1510 ctx->wp != NULL &&
1511 options_get_number(ctx->wp->options, "scroll-on-clear"))
1512 grid_view_clear_history(s->grid, bg);
1513 else
1514 grid_view_clear(s->grid, 0, 0, sx, sy, bg);
1515
1516 screen_write_collect_clear(ctx, 0, sy);
1517 tty_write(tty_cmd_clearscreen, &ttyctx);
1518 }
1519
1520 /* Clear entire history. */
1521 void
1522 screen_write_clearhistory(struct screen_write_ctx *ctx)
1523 {
1524 grid_clear_history(ctx->s->grid);
1525 }
1526
1527 /* Force a full redraw. */
1528 void
1529 screen_write_fullredraw(struct screen_write_ctx *ctx)
1530 {
1531 struct tty_ctx ttyctx;
1532
1533 screen_write_collect_flush(ctx, 0, __func__);
1534
1535 screen_write_initctx(ctx, &ttyctx, 1);
1536 if (ttyctx.redraw_cb != NULL)
1537 ttyctx.redraw_cb(&ttyctx);
1538 }
1539
1540 /* Trim collected items. */
1541 static struct screen_write_citem *
1542 screen_write_collect_trim(struct screen_write_ctx *ctx, u_int y, u_int x,
1543 u_int used, int *wrapped)
1544 {
1545 struct screen_write_cline *cl = &ctx->s->write_list[y];
1546 struct screen_write_citem *ci, *ci2, *tmp, *before = NULL;
1547 u_int sx = x, ex = x + used - 1;
1548 u_int csx, cex;
1549
1550 if (TAILQ_EMPTY(&cl->items))
1551 return (NULL);
1552 TAILQ_FOREACH_SAFE(ci, &cl->items, entry, tmp) {
1553 csx = ci->x;
1554 cex = ci->x + ci->used - 1;
1555
1556 /* Item is entirely before. */
1557 if (cex < sx) {
1558 log_debug("%s: %p %u-%u before %u-%u", __func__, ci,
1559 csx, cex, sx, ex);
1560 continue;
1561 }
1562
1563 /* Item is entirely after. */
1564 if (csx > ex) {
1565 log_debug("%s: %p %u-%u after %u-%u", __func__, ci,
1566 csx, cex, sx, ex);
1567 before = ci;
1568 break;
1569 }
1570
1571 /* Item is entirely inside. */
1572 if (csx >= sx && cex <= ex) {
1573 log_debug("%s: %p %u-%u inside %u-%u", __func__, ci,
1574 csx, cex, sx, ex);
1575 TAILQ_REMOVE(&cl->items, ci, entry);
1576 screen_write_free_citem(ci);
1577 if (csx == 0 && ci->wrapped && wrapped != NULL)
1578 *wrapped = 1;
1579 continue;
1580 }
1581
1582 /* Item under the start. */
1583 if (csx < sx && cex >= sx && cex <= ex) {
1584 log_debug("%s: %p %u-%u start %u-%u", __func__, ci,
1585 csx, cex, sx, ex);
1586 ci->used = sx - csx;
1587 log_debug("%s: %p now %u-%u", __func__, ci, ci->x,
1588 ci->x + ci->used + 1);
1589 continue;
1590 }
1591
1592 /* Item covers the end. */
1593 if (cex > ex && csx >= sx && csx <= ex) {
1594 log_debug("%s: %p %u-%u end %u-%u", __func__, ci,
1595 csx, cex, sx, ex);
1596 ci->x = ex + 1;
1597 ci->used = cex - ex;
1598 log_debug("%s: %p now %u-%u", __func__, ci, ci->x,
1599 ci->x + ci->used + 1);
1600 before = ci;
1601 break;
1602 }
1603
1604 /* Item must cover both sides. */
1605 log_debug("%s: %p %u-%u under %u-%u", __func__, ci,
1606 csx, cex, sx, ex);
1607 ci2 = screen_write_get_citem();
1608 ci2->type = ci->type;
1609 ci2->bg = ci->bg;
1610 memcpy(&ci2->gc, &ci->gc, sizeof ci2->gc);
1611 TAILQ_INSERT_AFTER(&cl->items, ci, ci2, entry);
1612
1613 ci->used = sx - csx;
1614 ci2->x = ex + 1;
1615 ci2->used = cex - ex;
1616
1617 log_debug("%s: %p now %u-%u (%p) and %u-%u (%p)", __func__, ci,
1618 ci->x, ci->x + ci->used - 1, ci, ci2->x,
1619 ci2->x + ci2->used - 1, ci2);
1620 before = ci2;
1621 break;
1622 }
1623 return (before);
1624 }
1625
1626 /* Clear collected lines. */
1627 static void
1628 screen_write_collect_clear(struct screen_write_ctx *ctx, u_int y, u_int n)
1629 {
1630 struct screen_write_cline *cl;
1631 u_int i;
1632
1633 for (i = y; i < y + n; i++) {
1634 cl = &ctx->s->write_list[i];
1635 TAILQ_CONCAT(&screen_write_citem_freelist, &cl->items, entry);
1636 }
1637 }
1638
1639 /* Scroll collected lines up. */
1640 static void
1641 screen_write_collect_scroll(struct screen_write_ctx *ctx, u_int bg)
1642 {
1643 struct screen *s = ctx->s;
1644 struct screen_write_cline *cl;
1645 u_int y;
1646 char *saved;
1647 struct screen_write_citem *ci;
1648
1649 log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy,
1650 s->rupper, s->rlower);
1651
1652 screen_write_collect_clear(ctx, s->rupper, 1);
1653 saved = ctx->s->write_list[s->rupper].data;
1654 for (y = s->rupper; y < s->rlower; y++) {
1655 cl = &ctx->s->write_list[y + 1];
1656 TAILQ_CONCAT(&ctx->s->write_list[y].items, &cl->items, entry);
1657 ctx->s->write_list[y].data = cl->data;
1658 }
1659 ctx->s->write_list[s->rlower].data = saved;
1660
1661 ci = screen_write_get_citem();
1662 ci->x = 0;
1663 ci->used = screen_size_x(s);
1664 ci->type = CLEAR;
1665 ci->bg = bg;
1666 TAILQ_INSERT_TAIL(&ctx->s->write_list[s->rlower].items, ci, entry);
1667 }
1668
1669 /* Flush collected lines. */
1670 static void
1671 screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
1672 const char *from)
1673 {
1674 struct screen *s = ctx->s;
1675 struct screen_write_citem *ci, *tmp;
1676 struct screen_write_cline *cl;
1677 u_int y, cx, cy, last, items = 0;
1678 struct tty_ctx ttyctx;
1679
1680 if (ctx->scrolled != 0) {
1681 log_debug("%s: scrolled %u (region %u-%u)", __func__,
1682 ctx->scrolled, s->rupper, s->rlower);
1683 if (ctx->scrolled > s->rlower - s->rupper + 1)
1684 ctx->scrolled = s->rlower - s->rupper + 1;
1685
1686 screen_write_initctx(ctx, &ttyctx, 1);
1687 ttyctx.num = ctx->scrolled;
1688 ttyctx.bg = ctx->bg;
1689 tty_write(tty_cmd_scrollup, &ttyctx);
1690 }
1691 ctx->scrolled = 0;
1692 ctx->bg = 8;
1693
1694 if (scroll_only)
1695 return;
1696
1697 cx = s->cx; cy = s->cy;
1698 for (y = 0; y < screen_size_y(s); y++) {
1699 cl = &ctx->s->write_list[y];
1700 last = UINT_MAX;
1701 TAILQ_FOREACH_SAFE(ci, &cl->items, entry, tmp) {
1702 if (last != UINT_MAX && ci->x <= last) {
1703 fatalx("collect list not in order: %u <= %u",
1704 ci->x, last);
1705 }
1706 screen_write_set_cursor(ctx, ci->x, y);
1707 if (ci->type == CLEAR) {
1708 screen_write_initctx(ctx, &ttyctx, 1);
1709 ttyctx.bg = ci->bg;
1710 ttyctx.num = ci->used;
1711 tty_write(tty_cmd_clearcharacter, &ttyctx);
1712 } else {
1713 screen_write_initctx(ctx, &ttyctx, 0);
1714 ttyctx.cell = &ci->gc;
1715 ttyctx.wrapped = ci->wrapped;
1716 ttyctx.ptr = cl->data + ci->x;
1717 ttyctx.num = ci->used;
1718 tty_write(tty_cmd_cells, &ttyctx);
1719 }
1720 items++;
1721
1722 TAILQ_REMOVE(&cl->items, ci, entry);
1723 screen_write_free_citem(ci);
1724 last = ci->x;
1725 }
1726 }
1727 s->cx = cx; s->cy = cy;
1728
1729 log_debug("%s: flushed %u items (%s)", __func__, items, from);
1730 }
1731
1732 /* Finish and store collected cells. */
1733 void
1734 screen_write_collect_end(struct screen_write_ctx *ctx)
1735 {
1736 struct screen *s = ctx->s;
1737 struct screen_write_citem *ci = ctx->item, *before;
1738 struct screen_write_cline *cl = &s->write_list[s->cy];
1739 struct grid_cell gc;
1740 u_int xx;
1741 int wrapped = ci->wrapped;
1742
1743 if (ci->used == 0)
1744 return;
1745
1746 before = screen_write_collect_trim(ctx, s->cy, s->cx, ci->used,
1747 &wrapped);
1748 ci->x = s->cx;
1749 ci->wrapped = wrapped;
1750 if (before == NULL)
1751 TAILQ_INSERT_TAIL(&cl->items, ci, entry);
1752 else
1753 TAILQ_INSERT_BEFORE(before, ci, entry);
1754 ctx->item = screen_write_get_citem();
1755
1756 log_debug("%s: %u %.*s (at %u,%u)", __func__, ci->used,
1757 (int)ci->used, cl->data + ci->x, s->cx, s->cy);
1758
1759 if (s->cx != 0) {
1760 for (xx = s->cx; xx > 0; xx--) {
1761 grid_view_get_cell(s->grid, xx, s->cy, &gc);
1762 if (~gc.flags & GRID_FLAG_PADDING)
1763 break;
1764 grid_view_set_cell(s->grid, xx, s->cy,
1765 &grid_default_cell);
1766 }
1767 if (gc.data.width > 1) {
1768 grid_view_set_cell(s->grid, xx, s->cy,
1769 &grid_default_cell);
1770 }
1771 }
1772
1773 grid_view_set_cells(s->grid, s->cx, s->cy, &ci->gc, cl->data + ci->x,
1774 ci->used);
1775 screen_write_set_cursor(ctx, s->cx + ci->used, -1);
1776
1777 for (xx = s->cx; xx < screen_size_x(s); xx++) {
1778 grid_view_get_cell(s->grid, xx, s->cy, &gc);
1779 if (~gc.flags & GRID_FLAG_PADDING)
1780 break;
1781 grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell);
1782 }
1783 }
1784
1785 /* Write cell data, collecting if necessary. */
1786 void
1787 screen_write_collect_add(struct screen_write_ctx *ctx,
1788 const struct grid_cell *gc)
1789 {
1790 struct screen *s = ctx->s;
1791 struct screen_write_citem *ci;
1792 u_int sx = screen_size_x(s);
1793 int collect;
1794
1795 /*
1796 * Don't need to check that the attributes and whatnot are still the
1797 * same - input_parse will end the collection when anything that isn't
1798 * a plain character is encountered.
1799 */
1800
1801 collect = 1;
1802 if (gc->data.width != 1 || gc->data.size != 1 || *gc->data.data >= 0x7f)
1803 collect = 0;
1804 else if (gc->attr & GRID_ATTR_CHARSET)
1805 collect = 0;
1806 else if (~s->mode & MODE_WRAP)
1807 collect = 0;
1808 else if (s->mode & MODE_INSERT)
1809 collect = 0;
1810 else if (s->sel != NULL)
1811 collect = 0;
1812 if (!collect) {
1813 screen_write_collect_end(ctx);
1814 screen_write_collect_flush(ctx, 0, __func__);
1815 screen_write_cell(ctx, gc);
1816 return;
1817 }
1818
1819 if (s->cx > sx - 1 || ctx->item->used > sx - 1 - s->cx)
1820 screen_write_collect_end(ctx);
1821 ci = ctx->item; /* may have changed */
1822
1823 if (s->cx > sx - 1) {
1824 log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy);
1825 ci->wrapped = 1;
1826 screen_write_linefeed(ctx, 1, 8);
1827 screen_write_set_cursor(ctx, 0, -1);
1828 }
1829
1830 if (ci->used == 0)
1831 memcpy(&ci->gc, gc, sizeof ci->gc);
1832 if (ctx->s->write_list[s->cy].data == NULL)
1833 ctx->s->write_list[s->cy].data = xmalloc(screen_size_x(ctx->s));
1834 ctx->s->write_list[s->cy].data[s->cx + ci->used++] = gc->data.data[0];
1835 }
1836
1837 /* Write cell data. */
1838 void
1839 screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
1840 {
1841 struct screen *s = ctx->s;
1842 struct grid *gd = s->grid;
1843 const struct utf8_data *ud = &gc->data;
1844 const struct utf8_data zwj = { "\342\200\215", 0, 3, 0 };
1845 struct grid_line *gl;
1846 struct grid_cell_entry *gce;
1847 struct grid_cell tmp_gc, now_gc;
1848 struct tty_ctx ttyctx;
1849 u_int sx = screen_size_x(s), sy = screen_size_y(s);
1850 u_int width = gc->data.width, xx, last, cx, cy;
1851 int selected, skip = 1;
1852
1853 /* Ignore padding cells. */
1854 if (gc->flags & GRID_FLAG_PADDING)
1855 return;
1856
1857 /*
1858 * If this is a zero width joiner, set the flag so the next character
1859 * will be treated as zero width and appended. Note that we assume a
1860 * ZWJ will not change the width - the width of the first character is
1861 * used.
1862 */
1863 if (ud->size == 3 && memcmp(ud->data, "\342\200\215", 3) == 0) {
1864 log_debug("zero width joiner at %u,%u", s->cx, s->cy);
1865 ctx->flags |= SCREEN_WRITE_ZWJ;
1866 return;
1867 }
1868
1869 /*
1870 * If the width is zero, combine onto the previous character. We always
1871 * combine with the cell to the left of the cursor position. In theory,
1872 * the application could have moved the cursor somewhere else, but if
1873 * they are silly enough to do that, who cares?
1874 */
1875 if (ctx->flags & SCREEN_WRITE_ZWJ) {
1876 screen_write_collect_flush(ctx, 0, __func__);
1877 screen_write_combine(ctx, &zwj, &xx, &cx);
1878 }
1879 if (width == 0 || (ctx->flags & SCREEN_WRITE_ZWJ)) {
1880 ctx->flags &= ~SCREEN_WRITE_ZWJ;
1881 screen_write_collect_flush(ctx, 0, __func__);
1882 if ((gc = screen_write_combine(ctx, ud, &xx, &cx)) != NULL) {
1883 cy = s->cy;
1884 screen_write_set_cursor(ctx, xx, s->cy);
1885 screen_write_initctx(ctx, &ttyctx, 0);
1886 ttyctx.cell = gc;
1887 tty_write(tty_cmd_cell, &ttyctx);
1888 s->cx = cx; s->cy = cy;
1889 }
1890 return;
1891 }
1892
1893 /* Flush any existing scrolling. */
1894 screen_write_collect_flush(ctx, 1, __func__);
1895
1896 /* If this character doesn't fit, ignore it. */
1897 if ((~s->mode & MODE_WRAP) &&
1898 width > 1 &&
1899 (width > sx || (s->cx != sx && s->cx > sx - width)))
1900 return;
1901
1902 /* If in insert mode, make space for the cells. */
1903 if (s->mode & MODE_INSERT) {
1904 grid_view_insert_cells(s->grid, s->cx, s->cy, width, 8);
1905 skip = 0;
1906 }
1907
1908 /* Check this will fit on the current line and wrap if not. */
1909 if ((s->mode & MODE_WRAP) && s->cx > sx - width) {
1910 log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy);
1911 screen_write_linefeed(ctx, 1, 8);
1912 screen_write_set_cursor(ctx, 0, -1);
1913 screen_write_collect_flush(ctx, 1, __func__);
1914 }
1915
1916 /* Sanity check cursor position. */
1917 if (s->cx > sx - width || s->cy > sy - 1)
1918 return;
1919 screen_write_initctx(ctx, &ttyctx, 0);
1920
1921 /* Handle overwriting of UTF-8 characters. */
1922 gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
1923 if (gl->flags & GRID_LINE_EXTENDED) {
1924 grid_view_get_cell(gd, s->cx, s->cy, &now_gc);
1925 if (screen_write_overwrite(ctx, &now_gc, width))
1926 skip = 0;
1927 }
1928
1929 /*
1930 * If the new character is UTF-8 wide, fill in padding cells. Have
1931 * already ensured there is enough room.
1932 */
1933 for (xx = s->cx + 1; xx < s->cx + width; xx++) {
1934 log_debug("%s: new padding at %u,%u", __func__, xx, s->cy);
1935 grid_view_set_padding(gd, xx, s->cy);
1936 skip = 0;
1937 }
1938
1939 /* If no change, do not draw. */
1940 if (skip) {
1941 if (s->cx >= gl->cellsize)
1942 skip = grid_cells_equal(gc, &grid_default_cell);
1943 else {
1944 gce = &gl->celldata[s->cx];
1945 if (gce->flags & GRID_FLAG_EXTENDED)
1946 skip = 0;
1947 else if (gc->flags != gce->flags)
1948 skip = 0;
1949 else if (gc->attr != gce->data.attr)
1950 skip = 0;
1951 else if (gc->fg != gce->data.fg)
1952 skip = 0;
1953 else if (gc->bg != gce->data.bg)
1954 skip = 0;
1955 else if (gc->data.width != 1)
1956 skip = 0;
1957 else if (gc->data.size != 1)
1958 skip = 0;
1959 else if (gce->data.data != gc->data.data[0])
1960 skip = 0;
1961 }
1962 }
1963
1964 /* Update the selected flag and set the cell. */
1965 selected = screen_check_selection(s, s->cx, s->cy);
1966 if (selected && (~gc->flags & GRID_FLAG_SELECTED)) {
1967 memcpy(&tmp_gc, gc, sizeof tmp_gc);
1968 tmp_gc.flags |= GRID_FLAG_SELECTED;
1969 grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
1970 } else if (!selected && (gc->flags & GRID_FLAG_SELECTED)) {
1971 memcpy(&tmp_gc, gc, sizeof tmp_gc);
1972 tmp_gc.flags &= ~GRID_FLAG_SELECTED;
1973 grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
1974 } else if (!skip)
1975 grid_view_set_cell(gd, s->cx, s->cy, gc);
1976 if (selected)
1977 skip = 0;
1978
1979 /*
1980 * Move the cursor. If not wrapping, stick at the last character and
1981 * replace it.
1982 */
1983 last = !(s->mode & MODE_WRAP);
1984 if (s->cx <= sx - last - width)
1985 screen_write_set_cursor(ctx, s->cx + width, -1);
1986 else
1987 screen_write_set_cursor(ctx, sx - last, -1);
1988
1989 /* Create space for character in insert mode. */
1990 if (s->mode & MODE_INSERT) {
1991 screen_write_collect_flush(ctx, 0, __func__);
1992 ttyctx.num = width;
1993 tty_write(tty_cmd_insertcharacter, &ttyctx);
1994 }
1995
1996 /* Write to the screen. */
1997 if (!skip) {
1998 if (selected) {
1999 screen_select_cell(s, &tmp_gc, gc);
2000 ttyctx.cell = &tmp_gc;
2001 } else
2002 ttyctx.cell = gc;
2003 tty_write(tty_cmd_cell, &ttyctx);
2004 }
2005 }
2006
2007 /* Combine a UTF-8 zero-width character onto the previous. */
2008 static const struct grid_cell *
2009 screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud,
2010 u_int *xx, u_int *cx)
2011 {
2012 struct screen *s = ctx->s;
2013 struct grid *gd = s->grid;
2014 static struct grid_cell gc;
2015 u_int n, width;
2016
2017 /* Can't combine if at 0. */
2018 if (s->cx == 0) {
2019 *xx = 0;
2020 return (NULL);
2021 }
2022 *xx = s->cx;
2023
2024 /* Empty data is out. */
2025 if (ud->size == 0)
2026 fatalx("UTF-8 data empty");
2027
2028 /* Retrieve the previous cell. */
2029 for (n = 1; n <= s->cx; n++) {
2030 grid_view_get_cell(gd, s->cx - n, s->cy, &gc);
2031 if (~gc.flags & GRID_FLAG_PADDING)
2032 break;
2033 }
2034 if (n > s->cx)
2035 return (NULL);
2036
2037 /* Check there is enough space. */
2038 if (gc.data.size + ud->size > sizeof gc.data.data)
2039 return (NULL);
2040 (*xx) -= n;
2041
2042 log_debug("%s: %.*s onto %.*s at %u,%u (width %u)", __func__,
2043 (int)ud->size, ud->data, (int)gc.data.size, gc.data.data, *xx,
2044 s->cy, gc.data.width);
2045
2046 /* Append the data. */
2047 memcpy(gc.data.data + gc.data.size, ud->data, ud->size);
2048 gc.data.size += ud->size;
2049 width = gc.data.width;
2050
2051 /* If this is U+FE0F VARIATION SELECTOR-16, force the width to 2. */
2052 if (gc.data.width == 1 &&
2053 ud->size == 3 &&
2054 memcmp(ud->data, "\357\270\217", 3) == 0) {
2055 grid_view_set_padding(gd, (*xx) + 1, s->cy);
2056 gc.data.width = 2;
2057 width += 2;
2058 }
2059
2060 /* Set the new cell. */
2061 grid_view_set_cell(gd, *xx, s->cy, &gc);
2062
2063 *cx = (*xx) + width;
2064 log_debug("%s: character at %u; cursor at %u", __func__, *xx, *cx);
2065 return (&gc);
2066 }
2067
2068 /*
2069 * UTF-8 wide characters are a bit of an annoyance. They take up more than one
2070 * cell on the screen, so following cells must not be drawn by marking them as
2071 * padding.
2072 *
2073 * So far, so good. The problem is, when overwriting a padding cell, or a UTF-8
2074 * character, it is necessary to also overwrite any other cells which covered
2075 * by the same character.
2076 */
2077 static int
2078 screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
2079 u_int width)
2080 {
2081 struct screen *s = ctx->s;
2082 struct grid *gd = s->grid;
2083 struct grid_cell tmp_gc;
2084 u_int xx;
2085 int done = 0;
2086
2087 if (gc->flags & GRID_FLAG_PADDING) {
2088 /*
2089 * A padding cell, so clear any following and leading padding
2090 * cells back to the character. Don't overwrite the current
2091 * cell as that happens later anyway.
2092 */
2093 xx = s->cx + 1;
2094 while (--xx > 0) {
2095 grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
2096 if (~tmp_gc.flags & GRID_FLAG_PADDING)
2097 break;
2098 log_debug("%s: padding at %u,%u", __func__, xx, s->cy);
2099 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
2100 }
2101
2102 /* Overwrite the character at the start of this padding. */
2103 log_debug("%s: character at %u,%u", __func__, xx, s->cy);
2104 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
2105 done = 1;
2106 }
2107
2108 /*
2109 * Overwrite any padding cells that belong to any UTF-8 characters
2110 * we'll be overwriting with the current character.
2111 */
2112 if (width != 1 ||
2113 gc->data.width != 1 ||
2114 gc->flags & GRID_FLAG_PADDING) {
2115 xx = s->cx + width - 1;
2116 while (++xx < screen_size_x(s)) {
2117 grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
2118 if (~tmp_gc.flags & GRID_FLAG_PADDING)
2119 break;
2120 log_debug("%s: overwrite at %u,%u", __func__, xx,
2121 s->cy);
2122 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
2123 done = 1;
2124 }
2125 }
2126
2127 return (done);
2128 }
2129
2130 /* Set external clipboard. */
2131 void
2132 screen_write_setselection(struct screen_write_ctx *ctx, const char *flags,
2133 u_char *str, u_int len)
2134 {
2135 struct tty_ctx ttyctx;
2136
2137 screen_write_initctx(ctx, &ttyctx, 0);
2138 ttyctx.ptr = str;
2139 ttyctx.ptr2 = (void *)flags;
2140 ttyctx.num = len;
2141
2142 tty_write(tty_cmd_setselection, &ttyctx);
2143 }
2144
2145 /* Write unmodified string. */
2146 void
2147 screen_write_rawstring(struct screen_write_ctx *ctx, u_char *str, u_int len,
2148 int allow_invisible_panes)
2149 {
2150 struct tty_ctx ttyctx;
2151
2152 screen_write_initctx(ctx, &ttyctx, 0);
2153 ttyctx.ptr = str;
2154 ttyctx.num = len;
2155 ttyctx.allow_invisible_panes = allow_invisible_panes;
2156
2157 tty_write(tty_cmd_rawstring, &ttyctx);
2158 }
2159
2160 /* Turn alternate screen on. */
2161 void
2162 screen_write_alternateon(struct screen_write_ctx *ctx, struct grid_cell *gc,
2163 int cursor)
2164 {
2165 struct tty_ctx ttyctx;
2166 struct window_pane *wp = ctx->wp;
2167
2168 if (wp != NULL && !options_get_number(wp->options, "alternate-screen"))
2169 return;
2170
2171 screen_write_collect_flush(ctx, 0, __func__);
2172 screen_alternate_on(ctx->s, gc, cursor);
2173
2174 screen_write_initctx(ctx, &ttyctx, 1);
2175 if (ttyctx.redraw_cb != NULL)
2176 ttyctx.redraw_cb(&ttyctx);
2177 }
2178
2179 /* Turn alternate screen off. */
2180 void
2181 screen_write_alternateoff(struct screen_write_ctx *ctx, struct grid_cell *gc,
2182 int cursor)
2183 {
2184 struct tty_ctx ttyctx;
2185 struct window_pane *wp = ctx->wp;
2186
2187 if (wp != NULL && !options_get_number(wp->options, "alternate-screen"))
2188 return;
2189
2190 screen_write_collect_flush(ctx, 0, __func__);
2191 screen_alternate_off(ctx->s, gc, cursor);
2192
2193 screen_write_initctx(ctx, &ttyctx, 1);
2194 if (ttyctx.redraw_cb != NULL)
2195 ttyctx.redraw_cb(&ttyctx);
2196 }