1 /* $OpenBSD: screen-write.c,v 1.160 2019/11/28 10:17:22 nicm Exp $ */ 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 void screen_write_initctx(struct screen_write_ctx *, 27 struct tty_ctx *); 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 *); 31 static void screen_write_collect_flush(struct screen_write_ctx *, int); 32 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 *); 37 38 static const struct grid_cell screen_write_pad_cell = { 39 { { 0 }, 0, 0, 0 }, 0, GRID_FLAG_PADDING, 0, 8, 8 40 }; 41 42 struct screen_write_collect_item { 43 u_int x; 44 int wrapped; 45 46 u_int used; 47 char data[256]; 48 49 struct grid_cell gc; 50 51 TAILQ_ENTRY(screen_write_collect_item) entry; 52 }; 53 struct screen_write_collect_line { 54 TAILQ_HEAD(, screen_write_collect_item) items; 55 }; 56 57 static void 58 screen_write_offset_timer(__unused int fd, __unused short events, void *data) 59 { 60 struct window *w = data; 61 62 tty_update_window_offset(w); 63 } 64 65 /* Set cursor position. */ 66 static void 67 screen_write_set_cursor(struct screen_write_ctx *ctx, int cx, int cy) 68 { 69 struct window_pane *wp = ctx->wp; 70 struct window *w; 71 struct screen *s = ctx->s; 72 struct timeval tv = { .tv_usec = 10000 }; 73 74 if (cx != -1 && (u_int)cx == s->cx && cy != -1 && (u_int)cy == s->cy) 75 return; 76 77 if (cx != -1) { 78 if ((u_int)cx > screen_size_x(s)) /* allow last column */ 79 cx = screen_size_x(s) - 1; 80 s->cx = cx; 81 } 82 if (cy != -1) { 83 if ((u_int)cy > screen_size_y(s) - 1) 84 cy = screen_size_y(s) - 1; 85 s->cy = cy; 86 } 87 88 if (wp == NULL) 89 return; 90 w = wp->window; 91 92 if (!event_initialized(&w->offset_timer)) 93 evtimer_set(&w->offset_timer, screen_write_offset_timer, w); 94 if (!evtimer_pending(&w->offset_timer, NULL)) 95 evtimer_add(&w->offset_timer, &tv); 96 } 97 98 /* Initialize writing with a window. */ 99 void 100 screen_write_start(struct screen_write_ctx *ctx, struct window_pane *wp, 101 struct screen *s) 102 { 103 u_int y; 104 105 memset(ctx, 0, sizeof *ctx); 106 107 ctx->wp = wp; 108 if (wp != NULL && s == NULL) 109 ctx->s = wp->screen; 110 else 111 ctx->s = s; 112 113 ctx->list = xcalloc(screen_size_y(ctx->s), sizeof *ctx->list); 114 for (y = 0; y < screen_size_y(ctx->s); y++) 115 TAILQ_INIT(&ctx->list[y].items); 116 ctx->item = xcalloc(1, sizeof *ctx->item); 117 118 ctx->scrolled = 0; 119 ctx->bg = 8; 120 121 if (log_get_level() != 0) { 122 if (wp != NULL) { 123 log_debug("%s: size %ux%u, pane %%%u (at %u,%u)", 124 __func__, screen_size_x(ctx->s), 125 screen_size_y(ctx->s), wp->id, wp->xoff, wp->yoff); 126 } else { 127 log_debug("%s: size %ux%u, no pane", 128 __func__, screen_size_x(ctx->s), 129 screen_size_y(ctx->s)); 130 } 131 } 132 } 133 134 /* Finish writing. */ 135 void 136 screen_write_stop(struct screen_write_ctx *ctx) 137 { 138 screen_write_collect_end(ctx); 139 screen_write_collect_flush(ctx, 0); 140 141 log_debug("%s: %u cells (%u written, %u skipped)", __func__, 142 ctx->cells, ctx->written, ctx->skipped); 143 144 free(ctx->item); 145 free(ctx->list); /* flush will have emptied */ 146 } 147 148 /* Reset screen state. */ 149 void 150 screen_write_reset(struct screen_write_ctx *ctx) 151 { 152 struct screen *s = ctx->s; 153 154 screen_reset_tabs(s); 155 screen_write_scrollregion(ctx, 0, screen_size_y(s) - 1); 156 157 s->mode = MODE_CURSOR | MODE_WRAP; 158 159 screen_write_clearscreen(ctx, 8); 160 screen_write_set_cursor(ctx, 0, 0); 161 } 162 163 /* Write character. */ 164 void 165 screen_write_putc(struct screen_write_ctx *ctx, const struct grid_cell *gcp, 166 u_char ch) 167 { 168 struct grid_cell gc; 169 170 memcpy(&gc, gcp, sizeof gc); 171 172 utf8_set(&gc.data, ch); 173 screen_write_cell(ctx, &gc); 174 } 175 176 /* Calculate string length. */ 177 size_t 178 screen_write_strlen(const char *fmt, ...) 179 { 180 va_list ap; 181 char *msg; 182 struct utf8_data ud; 183 u_char *ptr; 184 size_t left, size = 0; 185 enum utf8_state more; 186 187 va_start(ap, fmt); 188 xvasprintf(&msg, fmt, ap); 189 va_end(ap); 190 191 ptr = msg; 192 while (*ptr != '\0') { 193 if (*ptr > 0x7f && utf8_open(&ud, *ptr) == UTF8_MORE) { 194 ptr++; 195 196 left = strlen(ptr); 197 if (left < (size_t)ud.size - 1) 198 break; 199 while ((more = utf8_append(&ud, *ptr)) == UTF8_MORE) 200 ptr++; 201 ptr++; 202 203 if (more == UTF8_DONE) 204 size += ud.width; 205 } else { 206 if (*ptr > 0x1f && *ptr < 0x7f) 207 size++; 208 ptr++; 209 } 210 } 211 212 free(msg); 213 return (size); 214 } 215 216 /* Write simple string (no UTF-8 or maximum length). */ 217 void 218 screen_write_puts(struct screen_write_ctx *ctx, const struct grid_cell *gcp, 219 const char *fmt, ...) 220 { 221 va_list ap; 222 223 va_start(ap, fmt); 224 screen_write_vnputs(ctx, -1, gcp, fmt, ap); 225 va_end(ap); 226 } 227 228 /* Write string with length limit (-1 for unlimited). */ 229 void 230 screen_write_nputs(struct screen_write_ctx *ctx, ssize_t maxlen, 231 const struct grid_cell *gcp, const char *fmt, ...) 232 { 233 va_list ap; 234 235 va_start(ap, fmt); 236 screen_write_vnputs(ctx, maxlen, gcp, fmt, ap); 237 va_end(ap); 238 } 239 240 void 241 screen_write_vnputs(struct screen_write_ctx *ctx, ssize_t maxlen, 242 const struct grid_cell *gcp, const char *fmt, va_list ap) 243 { 244 struct grid_cell gc; 245 struct utf8_data *ud = &gc.data; 246 char *msg; 247 u_char *ptr; 248 size_t left, size = 0; 249 enum utf8_state more; 250 251 memcpy(&gc, gcp, sizeof gc); 252 xvasprintf(&msg, fmt, ap); 253 254 ptr = msg; 255 while (*ptr != '\0') { 256 if (*ptr > 0x7f && utf8_open(ud, *ptr) == UTF8_MORE) { 257 ptr++; 258 259 left = strlen(ptr); 260 if (left < (size_t)ud->size - 1) 261 break; 262 while ((more = utf8_append(ud, *ptr)) == UTF8_MORE) 263 ptr++; 264 ptr++; 265 266 if (more != UTF8_DONE) 267 continue; 268 if (maxlen > 0 && size + ud->width > (size_t)maxlen) { 269 while (size < (size_t)maxlen) { 270 screen_write_putc(ctx, &gc, ' '); 271 size++; 272 } 273 break; 274 } 275 size += ud->width; 276 screen_write_cell(ctx, &gc); 277 } else { 278 if (maxlen > 0 && size + 1 > (size_t)maxlen) 279 break; 280 281 if (*ptr == '\001') 282 gc.attr ^= GRID_ATTR_CHARSET; 283 else if (*ptr > 0x1f && *ptr < 0x7f) { 284 size++; 285 screen_write_putc(ctx, &gc, *ptr); 286 } 287 ptr++; 288 } 289 } 290 291 free(msg); 292 } 293 294 /* Copy from another screen. Assumes target region is big enough. */ 295 void 296 screen_write_copy(struct screen_write_ctx *ctx, struct screen *src, u_int px, 297 u_int py, u_int nx, u_int ny, bitstr_t *mbs, const struct grid_cell *mgc) 298 { 299 struct screen *s = ctx->s; 300 struct grid *gd = src->grid; 301 struct grid_cell gc; 302 u_int xx, yy, cx, cy, b; 303 304 if (nx == 0 || ny == 0) 305 return; 306 307 cx = s->cx; 308 cy = s->cy; 309 310 for (yy = py; yy < py + ny; yy++) { 311 for (xx = px; xx < px + nx; xx++) { 312 grid_get_cell(gd, xx, yy, &gc); 313 if (mbs != NULL) { 314 b = (yy * screen_size_x(src)) + xx; 315 if (bit_test(mbs, b)) { 316 gc.attr = mgc->attr; 317 gc.fg = mgc->fg; 318 gc.bg = mgc->bg; 319 } 320 } 321 if (xx + gc.data.width <= px + nx) 322 screen_write_cell(ctx, &gc); 323 } 324 cy++; 325 screen_write_set_cursor(ctx, cx, cy); 326 } 327 } 328 329 /* 330 * Copy from another screen but without the selection stuff. Also assumes the 331 * target region is already big enough. 332 */ 333 void 334 screen_write_fast_copy(struct screen_write_ctx *ctx, struct screen *src, 335 u_int px, u_int py, u_int nx, u_int ny) 336 { 337 struct screen *s = ctx->s; 338 struct grid *gd = src->grid; 339 struct grid_cell gc; 340 u_int xx, yy, cx, cy; 341 342 if (nx == 0 || ny == 0) 343 return; 344 345 cy = s->cy; 346 for (yy = py; yy < py + ny; yy++) { 347 if (yy >= gd->hsize + gd->sy) 348 break; 349 cx = s->cx; 350 for (xx = px; xx < px + nx; xx++) { 351 if (xx >= grid_get_line(gd, yy)->cellsize) 352 break; 353 grid_get_cell(gd, xx, yy, &gc); 354 if (xx + gc.data.width > px + nx) 355 break; 356 grid_view_set_cell(ctx->s->grid, cx, cy, &gc); 357 cx++; 358 } 359 cy++; 360 } 361 } 362 363 /* Draw a horizontal line on screen. */ 364 void 365 screen_write_hline(struct screen_write_ctx *ctx, u_int nx, int left, int right) 366 { 367 struct screen *s = ctx->s; 368 struct grid_cell gc; 369 u_int cx, cy, i; 370 371 cx = s->cx; 372 cy = s->cy; 373 374 memcpy(&gc, &grid_default_cell, sizeof gc); 375 gc.attr |= GRID_ATTR_CHARSET; 376 377 screen_write_putc(ctx, &gc, left ? 't' : 'q'); 378 for (i = 1; i < nx - 1; i++) 379 screen_write_putc(ctx, &gc, 'q'); 380 screen_write_putc(ctx, &gc, right ? 'u' : 'q'); 381 382 screen_write_set_cursor(ctx, cx, cy); 383 } 384 385 /* Draw a horizontal line on screen. */ 386 void 387 screen_write_vline(struct screen_write_ctx *ctx, u_int ny, int top, int bottom) 388 { 389 struct screen *s = ctx->s; 390 struct grid_cell gc; 391 u_int cx, cy, i; 392 393 cx = s->cx; 394 cy = s->cy; 395 396 memcpy(&gc, &grid_default_cell, sizeof gc); 397 gc.attr |= GRID_ATTR_CHARSET; 398 399 screen_write_putc(ctx, &gc, top ? 'w' : 'x'); 400 for (i = 1; i < ny - 1; i++) { 401 screen_write_set_cursor(ctx, cx, cy + i); 402 screen_write_putc(ctx, &gc, 'x'); 403 } 404 screen_write_set_cursor(ctx, cx, cy + ny - 1); 405 screen_write_putc(ctx, &gc, bottom ? 'v' : 'x'); 406 407 screen_write_set_cursor(ctx, cx, cy); 408 } 409 410 /* Draw a menu on screen. */ 411 void 412 screen_write_menu(struct screen_write_ctx *ctx, struct menu *menu, int choice) 413 { 414 struct screen *s = ctx->s; 415 struct grid_cell gc; 416 u_int cx, cy, i, j; 417 const char *name; 418 419 cx = s->cx; 420 cy = s->cy; 421 422 memcpy(&gc, &grid_default_cell, sizeof gc); 423 424 screen_write_box(ctx, menu->width + 4, menu->count + 2); 425 screen_write_cursormove(ctx, cx + 2, cy, 0); 426 format_draw(ctx, &gc, menu->width, menu->title, NULL); 427 428 for (i = 0; i < menu->count; i++) { 429 name = menu->items[i].name; 430 if (name == NULL) { 431 screen_write_cursormove(ctx, cx, cy + 1 + i, 0); 432 screen_write_hline(ctx, menu->width + 4, 1, 1); 433 } else { 434 if (choice >= 0 && i == (u_int)choice && *name != '-') 435 gc.attr |= GRID_ATTR_REVERSE; 436 screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0); 437 for (j = 0; j < menu->width; j++) 438 screen_write_putc(ctx, &gc, ' '); 439 screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0); 440 if (*name == '-') { 441 name++; 442 gc.attr |= GRID_ATTR_DIM; 443 format_draw(ctx, &gc, menu->width, name, NULL); 444 gc.attr &= ~GRID_ATTR_DIM; 445 } else 446 format_draw(ctx, &gc, menu->width, name, NULL); 447 if (choice >= 0 && i == (u_int)choice) 448 gc.attr &= ~GRID_ATTR_REVERSE; 449 } 450 } 451 452 screen_write_set_cursor(ctx, cx, cy); 453 } 454 455 /* Draw a box on screen. */ 456 void 457 screen_write_box(struct screen_write_ctx *ctx, u_int nx, u_int ny) 458 { 459 struct screen *s = ctx->s; 460 struct grid_cell gc; 461 u_int cx, cy, i; 462 463 cx = s->cx; 464 cy = s->cy; 465 466 memcpy(&gc, &grid_default_cell, sizeof gc); 467 gc.attr |= GRID_ATTR_CHARSET; 468 469 screen_write_putc(ctx, &gc, 'l'); 470 for (i = 1; i < nx - 1; i++) 471 screen_write_putc(ctx, &gc, 'q'); 472 screen_write_putc(ctx, &gc, 'k'); 473 474 screen_write_set_cursor(ctx, cx, cy + ny - 1); 475 screen_write_putc(ctx, &gc, 'm'); 476 for (i = 1; i < nx - 1; i++) 477 screen_write_putc(ctx, &gc, 'q'); 478 screen_write_putc(ctx, &gc, 'j'); 479 480 for (i = 1; i < ny - 1; i++) { 481 screen_write_set_cursor(ctx, cx, cy + i); 482 screen_write_putc(ctx, &gc, 'x'); 483 } 484 for (i = 1; i < ny - 1; i++) { 485 screen_write_set_cursor(ctx, cx + nx - 1, cy + i); 486 screen_write_putc(ctx, &gc, 'x'); 487 } 488 489 screen_write_set_cursor(ctx, cx, cy); 490 } 491 492 /* 493 * Write a preview version of a window. Assumes target area is big enough and 494 * already cleared. 495 */ 496 void 497 screen_write_preview(struct screen_write_ctx *ctx, struct screen *src, u_int nx, 498 u_int ny) 499 { 500 struct screen *s = ctx->s; 501 struct grid_cell gc; 502 u_int cx, cy, px, py; 503 504 cx = s->cx; 505 cy = s->cy; 506 507 /* 508 * If the cursor is on, pick the area around the cursor, otherwise use 509 * the top left. 510 */ 511 if (src->mode & MODE_CURSOR) { 512 px = src->cx; 513 if (px < nx / 3) 514 px = 0; 515 else 516 px = px - nx / 3; 517 if (px + nx > screen_size_x(src)) { 518 if (nx > screen_size_x(src)) 519 px = 0; 520 else 521 px = screen_size_x(src) - nx; 522 } 523 py = src->cy; 524 if (py < ny / 3) 525 py = 0; 526 else 527 py = py - ny / 3; 528 if (py + ny > screen_size_y(src)) { 529 if (ny > screen_size_y(src)) 530 py = 0; 531 else 532 py = screen_size_y(src) - ny; 533 } 534 } else { 535 px = 0; 536 py = 0; 537 } 538 539 screen_write_fast_copy(ctx, src, px, src->grid->hsize + py, nx, ny); 540 541 if (src->mode & MODE_CURSOR) { 542 grid_view_get_cell(src->grid, src->cx, src->cy, &gc); 543 gc.attr |= GRID_ATTR_REVERSE; 544 screen_write_set_cursor(ctx, cx + (src->cx - px), 545 cy + (src->cy - py)); 546 screen_write_cell(ctx, &gc); 547 } 548 } 549 550 /* Set up context for TTY command. */ 551 static void 552 screen_write_initctx(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx) 553 { 554 struct screen *s = ctx->s; 555 556 memset(ttyctx, 0, sizeof *ttyctx); 557 558 ttyctx->wp = ctx->wp; 559 560 ttyctx->ocx = s->cx; 561 ttyctx->ocy = s->cy; 562 563 ttyctx->orlower = s->rlower; 564 ttyctx->orupper = s->rupper; 565 } 566 567 /* Set a mode. */ 568 void 569 screen_write_mode_set(struct screen_write_ctx *ctx, int mode) 570 { 571 struct screen *s = ctx->s; 572 573 s->mode |= mode; 574 } 575 576 /* Clear a mode. */ 577 void 578 screen_write_mode_clear(struct screen_write_ctx *ctx, int mode) 579 { 580 struct screen *s = ctx->s; 581 582 s->mode &= ~mode; 583 } 584 585 /* Cursor up by ny. */ 586 void 587 screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny) 588 { 589 struct screen *s = ctx->s; 590 u_int cx = s->cx, cy = s->cy; 591 592 if (ny == 0) 593 ny = 1; 594 595 if (cy < s->rupper) { 596 /* Above region. */ 597 if (ny > cy) 598 ny = cy; 599 } else { 600 /* Below region. */ 601 if (ny > cy - s->rupper) 602 ny = cy - s->rupper; 603 } 604 if (cx == screen_size_x(s)) 605 cx--; 606 607 cy -= ny; 608 609 screen_write_set_cursor(ctx, cx, cy); 610 } 611 612 /* Cursor down by ny. */ 613 void 614 screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny) 615 { 616 struct screen *s = ctx->s; 617 u_int cx = s->cx, cy = s->cy; 618 619 if (ny == 0) 620 ny = 1; 621 622 if (cy > s->rlower) { 623 /* Below region. */ 624 if (ny > screen_size_y(s) - 1 - cy) 625 ny = screen_size_y(s) - 1 - cy; 626 } else { 627 /* Above region. */ 628 if (ny > s->rlower - cy) 629 ny = s->rlower - cy; 630 } 631 if (cx == screen_size_x(s)) 632 cx--; 633 else if (ny == 0) 634 return; 635 636 cy += ny; 637 638 screen_write_set_cursor(ctx, cx, cy); 639 } 640 641 /* Cursor right by nx. */ 642 void 643 screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx) 644 { 645 struct screen *s = ctx->s; 646 u_int cx = s->cx, cy = s->cy; 647 648 if (nx == 0) 649 nx = 1; 650 651 if (nx > screen_size_x(s) - 1 - cx) 652 nx = screen_size_x(s) - 1 - cx; 653 if (nx == 0) 654 return; 655 656 cx += nx; 657 658 screen_write_set_cursor(ctx, cx, cy); 659 } 660 661 /* Cursor left by nx. */ 662 void 663 screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx) 664 { 665 struct screen *s = ctx->s; 666 u_int cx = s->cx, cy = s->cy; 667 668 if (nx == 0) 669 nx = 1; 670 671 if (nx > cx) 672 nx = cx; 673 if (nx == 0) 674 return; 675 676 cx -= nx; 677 678 screen_write_set_cursor(ctx, cx, cy); 679 } 680 681 /* Backspace; cursor left unless at start of wrapped line when can move up. */ 682 void 683 screen_write_backspace(struct screen_write_ctx *ctx) 684 { 685 struct screen *s = ctx->s; 686 struct grid_line *gl; 687 u_int cx = s->cx, cy = s->cy; 688 689 if (cx == 0) { 690 if (cy == 0) 691 return; 692 gl = grid_get_line(s->grid, s->grid->hsize + cy - 1); 693 if (gl->flags & GRID_LINE_WRAPPED) { 694 cy--; 695 cx = screen_size_x(s) - 1; 696 } 697 } else 698 cx--; 699 700 screen_write_set_cursor(ctx, cx, cy); 701 } 702 703 /* VT100 alignment test. */ 704 void 705 screen_write_alignmenttest(struct screen_write_ctx *ctx) 706 { 707 struct screen *s = ctx->s; 708 struct tty_ctx ttyctx; 709 struct grid_cell gc; 710 u_int xx, yy; 711 712 memcpy(&gc, &grid_default_cell, sizeof gc); 713 utf8_set(&gc.data, 'E'); 714 715 for (yy = 0; yy < screen_size_y(s); yy++) { 716 for (xx = 0; xx < screen_size_x(s); xx++) 717 grid_view_set_cell(s->grid, xx, yy, &gc); 718 } 719 720 screen_write_set_cursor(ctx, 0, 0); 721 722 s->rupper = 0; 723 s->rlower = screen_size_y(s) - 1; 724 725 screen_write_initctx(ctx, &ttyctx); 726 727 screen_write_collect_clear(ctx, 0, screen_size_y(s) - 1); 728 tty_write(tty_cmd_alignmenttest, &ttyctx); 729 } 730 731 /* Insert nx characters. */ 732 void 733 screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg) 734 { 735 struct screen *s = ctx->s; 736 struct tty_ctx ttyctx; 737 738 if (nx == 0) 739 nx = 1; 740 741 if (nx > screen_size_x(s) - s->cx) 742 nx = screen_size_x(s) - s->cx; 743 if (nx == 0) 744 return; 745 746 if (s->cx > screen_size_x(s) - 1) 747 return; 748 749 screen_write_initctx(ctx, &ttyctx); 750 ttyctx.bg = bg; 751 752 grid_view_insert_cells(s->grid, s->cx, s->cy, nx, bg); 753 754 screen_write_collect_flush(ctx, 0); 755 ttyctx.num = nx; 756 tty_write(tty_cmd_insertcharacter, &ttyctx); 757 } 758 759 /* Delete nx characters. */ 760 void 761 screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg) 762 { 763 struct screen *s = ctx->s; 764 struct tty_ctx ttyctx; 765 766 if (nx == 0) 767 nx = 1; 768 769 if (nx > screen_size_x(s) - s->cx) 770 nx = screen_size_x(s) - s->cx; 771 if (nx == 0) 772 return; 773 774 if (s->cx > screen_size_x(s) - 1) 775 return; 776 777 screen_write_initctx(ctx, &ttyctx); 778 ttyctx.bg = bg; 779 780 grid_view_delete_cells(s->grid, s->cx, s->cy, nx, bg); 781 782 screen_write_collect_flush(ctx, 0); 783 ttyctx.num = nx; 784 tty_write(tty_cmd_deletecharacter, &ttyctx); 785 } 786 787 /* Clear nx characters. */ 788 void 789 screen_write_clearcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg) 790 { 791 struct screen *s = ctx->s; 792 struct tty_ctx ttyctx; 793 794 if (nx == 0) 795 nx = 1; 796 797 if (nx > screen_size_x(s) - s->cx) 798 nx = screen_size_x(s) - s->cx; 799 if (nx == 0) 800 return; 801 802 if (s->cx > screen_size_x(s) - 1) 803 return; 804 805 screen_write_initctx(ctx, &ttyctx); 806 ttyctx.bg = bg; 807 808 grid_view_clear(s->grid, s->cx, s->cy, nx, 1, bg); 809 810 screen_write_collect_flush(ctx, 0); 811 ttyctx.num = nx; 812 tty_write(tty_cmd_clearcharacter, &ttyctx); 813 } 814 815 /* Insert ny lines. */ 816 void 817 screen_write_insertline(struct screen_write_ctx *ctx, u_int ny, u_int bg) 818 { 819 struct screen *s = ctx->s; 820 struct grid *gd = s->grid; 821 struct tty_ctx ttyctx; 822 823 if (ny == 0) 824 ny = 1; 825 826 if (s->cy < s->rupper || s->cy > s->rlower) { 827 if (ny > screen_size_y(s) - s->cy) 828 ny = screen_size_y(s) - s->cy; 829 if (ny == 0) 830 return; 831 832 screen_write_initctx(ctx, &ttyctx); 833 ttyctx.bg = bg; 834 835 grid_view_insert_lines(gd, s->cy, ny, bg); 836 837 screen_write_collect_flush(ctx, 0); 838 ttyctx.num = ny; 839 tty_write(tty_cmd_insertline, &ttyctx); 840 return; 841 } 842 843 if (ny > s->rlower + 1 - s->cy) 844 ny = s->rlower + 1 - s->cy; 845 if (ny == 0) 846 return; 847 848 screen_write_initctx(ctx, &ttyctx); 849 ttyctx.bg = bg; 850 851 if (s->cy < s->rupper || s->cy > s->rlower) 852 grid_view_insert_lines(gd, s->cy, ny, bg); 853 else 854 grid_view_insert_lines_region(gd, s->rlower, s->cy, ny, bg); 855 856 screen_write_collect_flush(ctx, 0); 857 ttyctx.num = ny; 858 tty_write(tty_cmd_insertline, &ttyctx); 859 } 860 861 /* Delete ny lines. */ 862 void 863 screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny, u_int bg) 864 { 865 struct screen *s = ctx->s; 866 struct grid *gd = s->grid; 867 struct tty_ctx ttyctx; 868 869 if (ny == 0) 870 ny = 1; 871 872 if (s->cy < s->rupper || s->cy > s->rlower) { 873 if (ny > screen_size_y(s) - s->cy) 874 ny = screen_size_y(s) - s->cy; 875 if (ny == 0) 876 return; 877 878 screen_write_initctx(ctx, &ttyctx); 879 ttyctx.bg = bg; 880 881 grid_view_delete_lines(gd, s->cy, ny, bg); 882 883 screen_write_collect_flush(ctx, 0); 884 ttyctx.num = ny; 885 tty_write(tty_cmd_deleteline, &ttyctx); 886 return; 887 } 888 889 if (ny > s->rlower + 1 - s->cy) 890 ny = s->rlower + 1 - s->cy; 891 if (ny == 0) 892 return; 893 894 screen_write_initctx(ctx, &ttyctx); 895 ttyctx.bg = bg; 896 897 if (s->cy < s->rupper || s->cy > s->rlower) 898 grid_view_delete_lines(gd, s->cy, ny, bg); 899 else 900 grid_view_delete_lines_region(gd, s->rlower, s->cy, ny, bg); 901 902 screen_write_collect_flush(ctx, 0); 903 ttyctx.num = ny; 904 tty_write(tty_cmd_deleteline, &ttyctx); 905 } 906 907 /* Clear line at cursor. */ 908 void 909 screen_write_clearline(struct screen_write_ctx *ctx, u_int bg) 910 { 911 struct screen *s = ctx->s; 912 struct grid_line *gl; 913 struct tty_ctx ttyctx; 914 u_int sx = screen_size_x(s); 915 916 gl = grid_get_line(s->grid, s->grid->hsize + s->cy); 917 if (gl->cellsize == 0 && COLOUR_DEFAULT(bg)) 918 return; 919 920 screen_write_initctx(ctx, &ttyctx); 921 ttyctx.bg = bg; 922 923 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg); 924 925 screen_write_collect_clear(ctx, s->cy, 1); 926 screen_write_collect_flush(ctx, 0); 927 tty_write(tty_cmd_clearline, &ttyctx); 928 } 929 930 /* Clear to end of line from cursor. */ 931 void 932 screen_write_clearendofline(struct screen_write_ctx *ctx, u_int bg) 933 { 934 struct screen *s = ctx->s; 935 struct grid_line *gl; 936 struct tty_ctx ttyctx; 937 u_int sx = screen_size_x(s); 938 939 gl = grid_get_line(s->grid, s->grid->hsize + s->cy); 940 if (s->cx > sx - 1 || (s->cx >= gl->cellsize && COLOUR_DEFAULT(bg))) 941 return; 942 943 screen_write_initctx(ctx, &ttyctx); 944 ttyctx.bg = bg; 945 946 grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1, bg); 947 948 if (s->cx == 0) 949 screen_write_collect_clear(ctx, s->cy, 1); 950 screen_write_collect_flush(ctx, 0); 951 tty_write(tty_cmd_clearendofline, &ttyctx); 952 } 953 954 /* Clear to start of line from cursor. */ 955 void 956 screen_write_clearstartofline(struct screen_write_ctx *ctx, u_int bg) 957 { 958 struct screen *s = ctx->s; 959 struct tty_ctx ttyctx; 960 u_int sx = screen_size_x(s); 961 962 screen_write_initctx(ctx, &ttyctx); 963 ttyctx.bg = bg; 964 965 if (s->cx > sx - 1) 966 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg); 967 else 968 grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg); 969 970 if (s->cx > sx - 1) 971 screen_write_collect_clear(ctx, s->cy, 1); 972 screen_write_collect_flush(ctx, 0); 973 tty_write(tty_cmd_clearstartofline, &ttyctx); 974 } 975 976 /* Move cursor to px,py. */ 977 void 978 screen_write_cursormove(struct screen_write_ctx *ctx, int px, int py, 979 int origin) 980 { 981 struct screen *s = ctx->s; 982 983 if (origin && py != -1 && (s->mode & MODE_ORIGIN)) { 984 if ((u_int)py > s->rlower - s->rupper) 985 py = s->rlower; 986 else 987 py += s->rupper; 988 } 989 990 if (px != -1 && (u_int)px > screen_size_x(s) - 1) 991 px = screen_size_x(s) - 1; 992 if (py != -1 && (u_int)py > screen_size_y(s) - 1) 993 py = screen_size_y(s) - 1; 994 995 screen_write_set_cursor(ctx, px, py); 996 } 997 998 /* Reverse index (up with scroll). */ 999 void 1000 screen_write_reverseindex(struct screen_write_ctx *ctx, u_int bg) 1001 { 1002 struct screen *s = ctx->s; 1003 struct tty_ctx ttyctx; 1004 1005 screen_write_initctx(ctx, &ttyctx); 1006 ttyctx.bg = bg; 1007 1008 if (s->cy == s->rupper) 1009 grid_view_scroll_region_down(s->grid, s->rupper, s->rlower, bg); 1010 else if (s->cy > 0) 1011 screen_write_set_cursor(ctx, -1, s->cy - 1); 1012 1013 screen_write_collect_flush(ctx, 0); 1014 tty_write(tty_cmd_reverseindex, &ttyctx); 1015 } 1016 1017 /* Set scroll region. */ 1018 void 1019 screen_write_scrollregion(struct screen_write_ctx *ctx, u_int rupper, 1020 u_int rlower) 1021 { 1022 struct screen *s = ctx->s; 1023 1024 if (rupper > screen_size_y(s) - 1) 1025 rupper = screen_size_y(s) - 1; 1026 if (rlower > screen_size_y(s) - 1) 1027 rlower = screen_size_y(s) - 1; 1028 if (rupper >= rlower) /* cannot be one line */ 1029 return; 1030 1031 screen_write_collect_flush(ctx, 0); 1032 1033 /* Cursor moves to top-left. */ 1034 screen_write_set_cursor(ctx, 0, 0); 1035 1036 s->rupper = rupper; 1037 s->rlower = rlower; 1038 } 1039 1040 /* Line feed. */ 1041 void 1042 screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped, u_int bg) 1043 { 1044 struct screen *s = ctx->s; 1045 struct grid *gd = s->grid; 1046 struct grid_line *gl; 1047 1048 gl = grid_get_line(gd, gd->hsize + s->cy); 1049 if (wrapped) 1050 gl->flags |= GRID_LINE_WRAPPED; 1051 else 1052 gl->flags &= ~GRID_LINE_WRAPPED; 1053 1054 log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy, 1055 s->rupper, s->rlower); 1056 1057 if (bg != ctx->bg) { 1058 screen_write_collect_flush(ctx, 1); 1059 ctx->bg = bg; 1060 } 1061 1062 if (s->cy == s->rlower) { 1063 grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg); 1064 screen_write_collect_scroll(ctx); 1065 ctx->scrolled++; 1066 } else if (s->cy < screen_size_y(s) - 1) 1067 screen_write_set_cursor(ctx, -1, s->cy + 1); 1068 } 1069 1070 /* Scroll up. */ 1071 void 1072 screen_write_scrollup(struct screen_write_ctx *ctx, u_int lines, u_int bg) 1073 { 1074 struct screen *s = ctx->s; 1075 struct grid *gd = s->grid; 1076 u_int i; 1077 1078 if (lines == 0) 1079 lines = 1; 1080 else if (lines > s->rlower - s->rupper + 1) 1081 lines = s->rlower - s->rupper + 1; 1082 1083 if (bg != ctx->bg) { 1084 screen_write_collect_flush(ctx, 1); 1085 ctx->bg = bg; 1086 } 1087 1088 for (i = 0; i < lines; i++) { 1089 grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg); 1090 screen_write_collect_scroll(ctx); 1091 } 1092 ctx->scrolled += lines; 1093 } 1094 1095 /* Scroll down. */ 1096 void 1097 screen_write_scrolldown(struct screen_write_ctx *ctx, u_int lines, u_int bg) 1098 { 1099 struct screen *s = ctx->s; 1100 struct grid *gd = s->grid; 1101 struct tty_ctx ttyctx; 1102 u_int i; 1103 1104 screen_write_initctx(ctx, &ttyctx); 1105 ttyctx.bg = bg; 1106 1107 if (lines == 0) 1108 lines = 1; 1109 else if (lines > s->rlower - s->rupper + 1) 1110 lines = s->rlower - s->rupper + 1; 1111 1112 for (i = 0; i < lines; i++) 1113 grid_view_scroll_region_down(gd, s->rupper, s->rlower, bg); 1114 1115 screen_write_collect_flush(ctx, 0); 1116 ttyctx.num = lines; 1117 tty_write(tty_cmd_scrolldown, &ttyctx); 1118 } 1119 1120 /* Carriage return (cursor to start of line). */ 1121 void 1122 screen_write_carriagereturn(struct screen_write_ctx *ctx) 1123 { 1124 screen_write_set_cursor(ctx, 0, -1); 1125 } 1126 1127 /* Clear to end of screen from cursor. */ 1128 void 1129 screen_write_clearendofscreen(struct screen_write_ctx *ctx, u_int bg) 1130 { 1131 struct screen *s = ctx->s; 1132 struct grid *gd = s->grid; 1133 struct tty_ctx ttyctx; 1134 u_int sx = screen_size_x(s), sy = screen_size_y(s); 1135 1136 screen_write_initctx(ctx, &ttyctx); 1137 ttyctx.bg = bg; 1138 1139 /* Scroll into history if it is enabled and clearing entire screen. */ 1140 if (s->cx == 0 && s->cy == 0 && (gd->flags & GRID_HISTORY)) 1141 grid_view_clear_history(gd, bg); 1142 else { 1143 if (s->cx <= sx - 1) 1144 grid_view_clear(gd, s->cx, s->cy, sx - s->cx, 1, bg); 1145 grid_view_clear(gd, 0, s->cy + 1, sx, sy - (s->cy + 1), bg); 1146 } 1147 1148 screen_write_collect_clear(ctx, s->cy + 1, sy - (s->cy + 1)); 1149 screen_write_collect_flush(ctx, 0); 1150 tty_write(tty_cmd_clearendofscreen, &ttyctx); 1151 } 1152 1153 /* Clear to start of screen. */ 1154 void 1155 screen_write_clearstartofscreen(struct screen_write_ctx *ctx, u_int bg) 1156 { 1157 struct screen *s = ctx->s; 1158 struct tty_ctx ttyctx; 1159 u_int sx = screen_size_x(s); 1160 1161 screen_write_initctx(ctx, &ttyctx); 1162 ttyctx.bg = bg; 1163 1164 if (s->cy > 0) 1165 grid_view_clear(s->grid, 0, 0, sx, s->cy, bg); 1166 if (s->cx > sx - 1) 1167 grid_view_clear(s->grid, 0, s->cy, sx, 1, bg); 1168 else 1169 grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg); 1170 1171 screen_write_collect_clear(ctx, 0, s->cy); 1172 screen_write_collect_flush(ctx, 0); 1173 tty_write(tty_cmd_clearstartofscreen, &ttyctx); 1174 } 1175 1176 /* Clear entire screen. */ 1177 void 1178 screen_write_clearscreen(struct screen_write_ctx *ctx, u_int bg) 1179 { 1180 struct screen *s = ctx->s; 1181 struct tty_ctx ttyctx; 1182 u_int sx = screen_size_x(s), sy = screen_size_y(s); 1183 1184 screen_write_initctx(ctx, &ttyctx); 1185 ttyctx.bg = bg; 1186 1187 /* Scroll into history if it is enabled. */ 1188 if (s->grid->flags & GRID_HISTORY) 1189 grid_view_clear_history(s->grid, bg); 1190 else 1191 grid_view_clear(s->grid, 0, 0, sx, sy, bg); 1192 1193 screen_write_collect_clear(ctx, 0, sy); 1194 tty_write(tty_cmd_clearscreen, &ttyctx); 1195 } 1196 1197 /* Clear entire history. */ 1198 void 1199 screen_write_clearhistory(struct screen_write_ctx *ctx) 1200 { 1201 grid_clear_history(ctx->s->grid); 1202 } 1203 1204 /* Clear a collected line. */ 1205 static void 1206 screen_write_collect_clear(struct screen_write_ctx *ctx, u_int y, u_int n) 1207 { 1208 struct screen_write_collect_item *ci, *tmp; 1209 u_int i; 1210 size_t size; 1211 1212 for (i = y; i < y + n; i++) { 1213 if (TAILQ_EMPTY(&ctx->list[i].items)) 1214 continue; 1215 size = 0; 1216 TAILQ_FOREACH_SAFE(ci, &ctx->list[i].items, entry, tmp) { 1217 size += ci->used; 1218 TAILQ_REMOVE(&ctx->list[i].items, ci, entry); 1219 free(ci); 1220 } 1221 ctx->skipped += size; 1222 log_debug("%s: dropped %zu bytes (line %u)", __func__, size, i); 1223 } 1224 } 1225 1226 /* Scroll collected lines up. */ 1227 static void 1228 screen_write_collect_scroll(struct screen_write_ctx *ctx) 1229 { 1230 struct screen *s = ctx->s; 1231 struct screen_write_collect_line *cl; 1232 u_int y; 1233 1234 log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy, 1235 s->rupper, s->rlower); 1236 1237 screen_write_collect_clear(ctx, s->rupper, 1); 1238 for (y = s->rupper; y < s->rlower; y++) { 1239 cl = &ctx->list[y + 1]; 1240 TAILQ_CONCAT(&ctx->list[y].items, &cl->items, entry); 1241 } 1242 } 1243 1244 /* Flush collected lines. */ 1245 static void 1246 screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only) 1247 { 1248 struct screen *s = ctx->s; 1249 struct screen_write_collect_item *ci, *tmp; 1250 u_int y, cx, cy, items = 0; 1251 struct tty_ctx ttyctx; 1252 size_t written = 0; 1253 1254 if (ctx->scrolled != 0) { 1255 log_debug("%s: scrolled %u (region %u-%u)", __func__, 1256 ctx->scrolled, s->rupper, s->rlower); 1257 if (ctx->scrolled > s->rlower - s->rupper + 1) 1258 ctx->scrolled = s->rlower - s->rupper + 1; 1259 1260 screen_write_initctx(ctx, &ttyctx); 1261 ttyctx.num = ctx->scrolled; 1262 ttyctx.bg = ctx->bg; 1263 tty_write(tty_cmd_scrollup, &ttyctx); 1264 } 1265 ctx->scrolled = 0; 1266 ctx->bg = 8; 1267 1268 if (scroll_only) 1269 return; 1270 1271 cx = s->cx; cy = s->cy; 1272 for (y = 0; y < screen_size_y(s); y++) { 1273 TAILQ_FOREACH_SAFE(ci, &ctx->list[y].items, entry, tmp) { 1274 screen_write_set_cursor(ctx, ci->x, y); 1275 screen_write_initctx(ctx, &ttyctx); 1276 ttyctx.cell = &ci->gc; 1277 ttyctx.wrapped = ci->wrapped; 1278 ttyctx.ptr = ci->data; 1279 ttyctx.num = ci->used; 1280 tty_write(tty_cmd_cells, &ttyctx); 1281 1282 items++; 1283 written += ci->used; 1284 1285 TAILQ_REMOVE(&ctx->list[y].items, ci, entry); 1286 free(ci); 1287 } 1288 } 1289 s->cx = cx; s->cy = cy; 1290 1291 log_debug("%s: flushed %u items (%zu bytes)", __func__, items, written); 1292 ctx->written += written; 1293 } 1294 1295 /* Finish and store collected cells. */ 1296 void 1297 screen_write_collect_end(struct screen_write_ctx *ctx) 1298 { 1299 struct screen *s = ctx->s; 1300 struct screen_write_collect_item *ci = ctx->item; 1301 struct grid_cell gc; 1302 u_int xx; 1303 1304 if (ci->used == 0) 1305 return; 1306 ci->data[ci->used] = '\0'; 1307 1308 ci->x = s->cx; 1309 TAILQ_INSERT_TAIL(&ctx->list[s->cy].items, ci, entry); 1310 ctx->item = xcalloc(1, sizeof *ctx->item); 1311 1312 log_debug("%s: %u %s (at %u,%u)", __func__, ci->used, ci->data, s->cx, 1313 s->cy); 1314 1315 if (s->cx != 0) { 1316 for (xx = s->cx; xx > 0; xx--) { 1317 grid_view_get_cell(s->grid, xx, s->cy, &gc); 1318 if (~gc.flags & GRID_FLAG_PADDING) 1319 break; 1320 grid_view_set_cell(s->grid, xx, s->cy, 1321 &grid_default_cell); 1322 } 1323 if (gc.data.width > 1) { 1324 grid_view_set_cell(s->grid, xx, s->cy, 1325 &grid_default_cell); 1326 } 1327 } 1328 1329 grid_view_set_cells(s->grid, s->cx, s->cy, &ci->gc, ci->data, ci->used); 1330 screen_write_set_cursor(ctx, s->cx + ci->used, -1); 1331 1332 for (xx = s->cx; xx < screen_size_x(s); xx++) { 1333 grid_view_get_cell(s->grid, xx, s->cy, &gc); 1334 if (~gc.flags & GRID_FLAG_PADDING) 1335 break; 1336 grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell); 1337 } 1338 } 1339 1340 /* Write cell data, collecting if necessary. */ 1341 void 1342 screen_write_collect_add(struct screen_write_ctx *ctx, 1343 const struct grid_cell *gc) 1344 { 1345 struct screen *s = ctx->s; 1346 struct screen_write_collect_item *ci; 1347 u_int sx = screen_size_x(s); 1348 int collect; 1349 1350 /* 1351 * Don't need to check that the attributes and whatnot are still the 1352 * same - input_parse will end the collection when anything that isn't 1353 * a plain character is encountered. 1354 */ 1355 1356 collect = 1; 1357 if (gc->data.width != 1 || gc->data.size != 1 || *gc->data.data >= 0x7f) 1358 collect = 0; 1359 else if (gc->attr & GRID_ATTR_CHARSET) 1360 collect = 0; 1361 else if (~s->mode & MODE_WRAP) 1362 collect = 0; 1363 else if (s->mode & MODE_INSERT) 1364 collect = 0; 1365 else if (s->sel != NULL) 1366 collect = 0; 1367 if (!collect) { 1368 screen_write_collect_end(ctx); 1369 screen_write_collect_flush(ctx, 0); 1370 screen_write_cell(ctx, gc); 1371 return; 1372 } 1373 ctx->cells++; 1374 1375 if (s->cx > sx - 1 || ctx->item->used > sx - 1 - s->cx) 1376 screen_write_collect_end(ctx); 1377 ci = ctx->item; /* may have changed */ 1378 1379 if (s->cx > sx - 1) { 1380 log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy); 1381 ci->wrapped = 1; 1382 screen_write_linefeed(ctx, 1, 8); 1383 screen_write_set_cursor(ctx, 0, -1); 1384 } 1385 1386 if (ci->used == 0) 1387 memcpy(&ci->gc, gc, sizeof ci->gc); 1388 ci->data[ci->used++] = gc->data.data[0]; 1389 if (ci->used == (sizeof ci->data) - 1) 1390 screen_write_collect_end(ctx); 1391 } 1392 1393 /* Write cell data. */ 1394 void 1395 screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc) 1396 { 1397 struct screen *s = ctx->s; 1398 struct grid *gd = s->grid; 1399 struct grid_line *gl; 1400 struct grid_cell_entry *gce; 1401 struct grid_cell tmp_gc, now_gc; 1402 struct tty_ctx ttyctx; 1403 u_int sx = screen_size_x(s), sy = screen_size_y(s); 1404 u_int width = gc->data.width, xx, last, cx, cy; 1405 int selected, skip = 1; 1406 1407 /* Ignore padding cells. */ 1408 if (gc->flags & GRID_FLAG_PADDING) 1409 return; 1410 ctx->cells++; 1411 1412 /* If the width is zero, combine onto the previous character. */ 1413 if (width == 0) { 1414 screen_write_collect_flush(ctx, 0); 1415 if ((gc = screen_write_combine(ctx, &gc->data, &xx)) != 0) { 1416 cx = s->cx; cy = s->cy; 1417 screen_write_set_cursor(ctx, xx, s->cy); 1418 screen_write_initctx(ctx, &ttyctx); 1419 ttyctx.cell = gc; 1420 tty_write(tty_cmd_cell, &ttyctx); 1421 s->cx = cx; s->cy = cy; 1422 } 1423 return; 1424 } 1425 1426 /* Flush any existing scrolling. */ 1427 screen_write_collect_flush(ctx, 1); 1428 1429 /* If this character doesn't fit, ignore it. */ 1430 if ((~s->mode & MODE_WRAP) && 1431 width > 1 && 1432 (width > sx || (s->cx != sx && s->cx > sx - width))) 1433 return; 1434 1435 /* If in insert mode, make space for the cells. */ 1436 if (s->mode & MODE_INSERT) { 1437 grid_view_insert_cells(s->grid, s->cx, s->cy, width, 8); 1438 skip = 0; 1439 } 1440 1441 /* Check this will fit on the current line and wrap if not. */ 1442 if ((s->mode & MODE_WRAP) && s->cx > sx - width) { 1443 log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy); 1444 screen_write_linefeed(ctx, 1, 8); 1445 screen_write_set_cursor(ctx, 0, -1); 1446 screen_write_collect_flush(ctx, 1); 1447 } 1448 1449 /* Sanity check cursor position. */ 1450 if (s->cx > sx - width || s->cy > sy - 1) 1451 return; 1452 screen_write_initctx(ctx, &ttyctx); 1453 1454 /* Handle overwriting of UTF-8 characters. */ 1455 gl = grid_get_line(s->grid, s->grid->hsize + s->cy); 1456 if (gl->flags & GRID_LINE_EXTENDED) { 1457 grid_view_get_cell(gd, s->cx, s->cy, &now_gc); 1458 if (screen_write_overwrite(ctx, &now_gc, width)) 1459 skip = 0; 1460 } 1461 1462 /* 1463 * If the new character is UTF-8 wide, fill in padding cells. Have 1464 * already ensured there is enough room. 1465 */ 1466 for (xx = s->cx + 1; xx < s->cx + width; xx++) { 1467 log_debug("%s: new padding at %u,%u", __func__, xx, s->cy); 1468 grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell); 1469 skip = 0; 1470 } 1471 1472 /* If no change, do not draw. */ 1473 if (skip) { 1474 if (s->cx >= gl->cellsize) 1475 skip = grid_cells_equal(gc, &grid_default_cell); 1476 else { 1477 gce = &gl->celldata[s->cx]; 1478 if (gce->flags & GRID_FLAG_EXTENDED) 1479 skip = 0; 1480 else if (gc->flags != gce->flags) 1481 skip = 0; 1482 else if (gc->attr != gce->data.attr) 1483 skip = 0; 1484 else if (gc->fg != gce->data.fg) 1485 skip = 0; 1486 else if (gc->bg != gce->data.bg) 1487 skip = 0; 1488 else if (gc->data.width != 1) 1489 skip = 0; 1490 else if (gc->data.size != 1) 1491 skip = 0; 1492 else if (gce->data.data != gc->data.data[0]) 1493 skip = 0; 1494 } 1495 } 1496 1497 /* Update the selected flag and set the cell. */ 1498 selected = screen_check_selection(s, s->cx, s->cy); 1499 if (selected && (~gc->flags & GRID_FLAG_SELECTED)) { 1500 memcpy(&tmp_gc, gc, sizeof tmp_gc); 1501 tmp_gc.flags |= GRID_FLAG_SELECTED; 1502 grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc); 1503 } else if (!selected && (gc->flags & GRID_FLAG_SELECTED)) { 1504 memcpy(&tmp_gc, gc, sizeof tmp_gc); 1505 tmp_gc.flags &= ~GRID_FLAG_SELECTED; 1506 grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc); 1507 } else if (!skip) 1508 grid_view_set_cell(gd, s->cx, s->cy, gc); 1509 if (selected) 1510 skip = 0; 1511 1512 /* 1513 * Move the cursor. If not wrapping, stick at the last character and 1514 * replace it. 1515 */ 1516 last = !(s->mode & MODE_WRAP); 1517 if (s->cx <= sx - last - width) 1518 screen_write_set_cursor(ctx, s->cx + width, -1); 1519 else 1520 screen_write_set_cursor(ctx, sx - last, -1); 1521 1522 /* Create space for character in insert mode. */ 1523 if (s->mode & MODE_INSERT) { 1524 screen_write_collect_flush(ctx, 0); 1525 ttyctx.num = width; 1526 tty_write(tty_cmd_insertcharacter, &ttyctx); 1527 } 1528 1529 /* Write to the screen. */ 1530 if (!skip) { 1531 if (selected) { 1532 screen_select_cell(s, &tmp_gc, gc); 1533 ttyctx.cell = &tmp_gc; 1534 } else 1535 ttyctx.cell = gc; 1536 tty_write(tty_cmd_cell, &ttyctx); 1537 ctx->written++; 1538 } else 1539 ctx->skipped++; 1540 } 1541 1542 /* Combine a UTF-8 zero-width character onto the previous. */ 1543 static const struct grid_cell * 1544 screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud, 1545 u_int *xx) 1546 { 1547 struct screen *s = ctx->s; 1548 struct grid *gd = s->grid; 1549 static struct grid_cell gc; 1550 u_int n; 1551 1552 /* Can't combine if at 0. */ 1553 if (s->cx == 0) 1554 return (NULL); 1555 1556 /* Empty data is out. */ 1557 if (ud->size == 0) 1558 fatalx("UTF-8 data empty"); 1559 1560 /* Retrieve the previous cell. */ 1561 for (n = 1; n <= s->cx; n++) { 1562 grid_view_get_cell(gd, s->cx - n, s->cy, &gc); 1563 if (~gc.flags & GRID_FLAG_PADDING) 1564 break; 1565 } 1566 if (n > s->cx) 1567 return (NULL); 1568 *xx = s->cx - n; 1569 1570 /* Check there is enough space. */ 1571 if (gc.data.size + ud->size > sizeof gc.data.data) 1572 return (NULL); 1573 1574 log_debug("%s: %.*s onto %.*s at %u,%u", __func__, (int)ud->size, 1575 ud->data, (int)gc.data.size, gc.data.data, *xx, s->cy); 1576 1577 /* Append the data. */ 1578 memcpy(gc.data.data + gc.data.size, ud->data, ud->size); 1579 gc.data.size += ud->size; 1580 1581 /* Set the new cell. */ 1582 grid_view_set_cell(gd, *xx, s->cy, &gc); 1583 1584 return (&gc); 1585 } 1586 1587 /* 1588 * UTF-8 wide characters are a bit of an annoyance. They take up more than one 1589 * cell on the screen, so following cells must not be drawn by marking them as 1590 * padding. 1591 * 1592 * So far, so good. The problem is, when overwriting a padding cell, or a UTF-8 1593 * character, it is necessary to also overwrite any other cells which covered 1594 * by the same character. 1595 */ 1596 static int 1597 screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc, 1598 u_int width) 1599 { 1600 struct screen *s = ctx->s; 1601 struct grid *gd = s->grid; 1602 struct grid_cell tmp_gc; 1603 u_int xx; 1604 int done = 0; 1605 1606 if (gc->flags & GRID_FLAG_PADDING) { 1607 /* 1608 * A padding cell, so clear any following and leading padding 1609 * cells back to the character. Don't overwrite the current 1610 * cell as that happens later anyway. 1611 */ 1612 xx = s->cx + 1; 1613 while (--xx > 0) { 1614 grid_view_get_cell(gd, xx, s->cy, &tmp_gc); 1615 if (~tmp_gc.flags & GRID_FLAG_PADDING) 1616 break; 1617 log_debug("%s: padding at %u,%u", __func__, xx, s->cy); 1618 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell); 1619 } 1620 1621 /* Overwrite the character at the start of this padding. */ 1622 log_debug("%s: character at %u,%u", __func__, xx, s->cy); 1623 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell); 1624 done = 1; 1625 } 1626 1627 /* 1628 * Overwrite any padding cells that belong to any UTF-8 characters 1629 * we'll be overwriting with the current character. 1630 */ 1631 if (width != 1 || 1632 gc->data.width != 1 || 1633 gc->flags & GRID_FLAG_PADDING) { 1634 xx = s->cx + width - 1; 1635 while (++xx < screen_size_x(s)) { 1636 grid_view_get_cell(gd, xx, s->cy, &tmp_gc); 1637 if (~tmp_gc.flags & GRID_FLAG_PADDING) 1638 break; 1639 log_debug("%s: overwrite at %u,%u", __func__, xx, 1640 s->cy); 1641 grid_view_set_cell(gd, xx, s->cy, &grid_default_cell); 1642 done = 1; 1643 } 1644 } 1645 1646 return (done); 1647 } 1648 1649 /* Set external clipboard. */ 1650 void 1651 screen_write_setselection(struct screen_write_ctx *ctx, u_char *str, u_int len) 1652 { 1653 struct tty_ctx ttyctx; 1654 1655 screen_write_initctx(ctx, &ttyctx); 1656 ttyctx.ptr = str; 1657 ttyctx.num = len; 1658 1659 tty_write(tty_cmd_setselection, &ttyctx); 1660 } 1661 1662 /* Write unmodified string. */ 1663 void 1664 screen_write_rawstring(struct screen_write_ctx *ctx, u_char *str, u_int len) 1665 { 1666 struct tty_ctx ttyctx; 1667 1668 screen_write_initctx(ctx, &ttyctx); 1669 ttyctx.ptr = str; 1670 ttyctx.num = len; 1671 1672 tty_write(tty_cmd_rawstring, &ttyctx); 1673 } 1674