Annotation of src/usr.bin/tmux/grid.c, Revision 1.37
1.37 ! nicm 1: /* $OpenBSD: grid.c,v 1.36 2014/03/31 21:42:27 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
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:
1.20 nicm 21: #include <stdlib.h>
1.1 nicm 22: #include <string.h>
23:
24: #include "tmux.h"
25:
26: /*
27: * Grid data. This is the basic data structure that represents what is shown on
28: * screen.
29: *
30: * A grid is a grid of cells (struct grid_cell). Lines are not allocated until
31: * cells in that line are written to. The grid is split into history and
32: * viewable data with the history starting at row (line) 0 and extending to
33: * (hsize - 1); from hsize to hsize + (sy - 1) is the viewable data. All
34: * functions in this file work on absolute coordinates, grid-view.c has
35: * functions which work on the screen data.
36: */
37:
38: /* Default grid cell data. */
1.21 nicm 39: const struct grid_cell grid_default_cell = { 0, 0, 8, 8, (1 << 4) | 1, " " };
1.1 nicm 40:
41: #define grid_put_cell(gd, px, py, gc) do { \
1.10 nicm 42: memcpy(&gd->linedata[py].celldata[px], \
43: gc, sizeof gd->linedata[py].celldata[px]); \
1.1 nicm 44: } while (0)
45: #define grid_put_utf8(gd, px, py, gc) do { \
1.10 nicm 46: memcpy(&gd->linedata[py].utf8data[px], \
47: gc, sizeof gd->linedata[py].utf8data[px]); \
1.1 nicm 48: } while (0)
49:
50: int grid_check_y(struct grid *, u_int);
51:
52: #ifdef DEBUG
53: int
54: grid_check_y(struct grid *gd, u_int py)
55: {
56: if ((py) >= (gd)->hsize + (gd)->sy)
57: log_fatalx("y out of range: %u", py);
58: return (0);
59: }
60: #else
61: int
62: grid_check_y(struct grid *gd, u_int py)
63: {
64: if ((py) >= (gd)->hsize + (gd)->sy) {
65: log_debug("y out of range: %u", py);
66: return (-1);
67: }
68: return (0);
69: }
70: #endif
71:
1.23 nicm 72: void grid_reflow_join(struct grid *, u_int *, struct grid_line *, u_int);
73: void grid_reflow_split(struct grid *, u_int *, struct grid_line *, u_int,
74: u_int);
75: void grid_reflow_move(struct grid *, u_int *, struct grid_line *);
1.24 nicm 76: size_t grid_string_cells_fg(const struct grid_cell *, int *);
77: size_t grid_string_cells_bg(const struct grid_cell *, int *);
78: void grid_string_cells_code(const struct grid_cell *,
1.26 nicm 79: const struct grid_cell *, char *, size_t, int);
1.23 nicm 80:
1.1 nicm 81: /* Create a new grid. */
82: struct grid *
83: grid_create(u_int sx, u_int sy, u_int hlimit)
84: {
85: struct grid *gd;
86:
87: gd = xmalloc(sizeof *gd);
88: gd->sx = sx;
89: gd->sy = sy;
90:
1.7 nicm 91: gd->flags = GRID_HISTORY;
92:
1.1 nicm 93: gd->hsize = 0;
94: gd->hlimit = hlimit;
95:
1.10 nicm 96: gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);
1.1 nicm 97:
98: return (gd);
99: }
100:
101: /* Destroy grid. */
102: void
103: grid_destroy(struct grid *gd)
104: {
1.10 nicm 105: struct grid_line *gl;
106: u_int yy;
1.1 nicm 107:
108: for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
1.10 nicm 109: gl = &gd->linedata[yy];
1.20 nicm 110: free(gl->celldata);
1.1 nicm 111: }
112:
1.20 nicm 113: free(gd->linedata);
1.1 nicm 114:
1.20 nicm 115: free(gd);
1.1 nicm 116: }
117:
118: /* Compare grids. */
119: int
120: grid_compare(struct grid *ga, struct grid *gb)
121: {
1.10 nicm 122: struct grid_line *gla, *glb;
1.1 nicm 123: struct grid_cell *gca, *gcb;
124: u_int xx, yy;
125:
1.33 nicm 126: if (ga->sx != gb->sx || ga->sy != gb->sy)
1.1 nicm 127: return (1);
128:
129: for (yy = 0; yy < ga->sy; yy++) {
1.10 nicm 130: gla = &ga->linedata[yy];
131: glb = &gb->linedata[yy];
132: if (gla->cellsize != glb->cellsize)
1.1 nicm 133: return (1);
134: for (xx = 0; xx < ga->sx; xx++) {
1.10 nicm 135: gca = &gla->celldata[xx];
136: gcb = &glb->celldata[xx];
1.1 nicm 137: if (memcmp(gca, gcb, sizeof (struct grid_cell)) != 0)
138: return (1);
139: }
140: }
141:
142: return (0);
143: }
144:
1.15 nicm 145: /*
146: * Collect lines from the history if at the limit. Free the top (oldest) 10%
147: * and shift up.
148: */
1.1 nicm 149: void
1.15 nicm 150: grid_collect_history(struct grid *gd)
1.1 nicm 151: {
152: u_int yy;
153:
1.15 nicm 154: if (gd->hsize < gd->hlimit)
155: return;
156:
157: yy = gd->hlimit / 10;
158: if (yy < 1)
159: yy = 1;
160:
161: grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
162: gd->hsize -= yy;
163: }
164:
1.17 nicm 165: /*
1.15 nicm 166: * Scroll the entire visible screen, moving one line into the history. Just
167: * allocate a new line at the bottom and move the history size indicator.
168: */
169: void
170: grid_scroll_history(struct grid *gd)
171: {
172: u_int yy;
1.1 nicm 173:
174: yy = gd->hsize + gd->sy;
1.15 nicm 175: gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);
176: memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);
1.17 nicm 177:
1.15 nicm 178: gd->hsize++;
179: }
1.1 nicm 180:
1.15 nicm 181: /* Scroll a region up, moving the top line into the history. */
182: void
183: grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower)
184: {
185: struct grid_line *gl_history, *gl_upper, *gl_lower;
186: u_int yy;
187:
188: /* Create a space for a new line. */
189: yy = gd->hsize + gd->sy;
1.10 nicm 190: gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);
1.1 nicm 191:
1.15 nicm 192: /* Move the entire screen down to free a space for this line. */
193: gl_history = &gd->linedata[gd->hsize];
194: memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);
195:
196: /* Adjust the region and find its start and end. */
197: upper++;
198: gl_upper = &gd->linedata[upper];
199: lower++;
200: gl_lower = &gd->linedata[lower];
201:
202: /* Move the line into the history. */
203: memcpy(gl_history, gl_upper, sizeof *gl_history);
204:
205: /* Then move the region up and clear the bottom line. */
206: memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
207: memset(gl_lower, 0, sizeof *gl_lower);
208:
209: /* Move the history offset down over the line. */
1.1 nicm 210: gd->hsize++;
211: }
212:
213: /* Expand line to fit to cell. */
214: void
1.14 nicm 215: grid_expand_line(struct grid *gd, u_int py, u_int sx)
1.1 nicm 216: {
1.10 nicm 217: struct grid_line *gl;
1.14 nicm 218: u_int xx;
1.1 nicm 219:
1.10 nicm 220: gl = &gd->linedata[py];
1.14 nicm 221: if (sx <= gl->cellsize)
1.1 nicm 222: return;
223:
1.10 nicm 224: gl->celldata = xrealloc(gl->celldata, sx, sizeof *gl->celldata);
225: for (xx = gl->cellsize; xx < sx; xx++)
1.1 nicm 226: grid_put_cell(gd, xx, py, &grid_default_cell);
1.10 nicm 227: gl->cellsize = sx;
1.1 nicm 228: }
229:
1.26 nicm 230: /* Peek at grid line. */
231: const struct grid_line *
232: grid_peek_line(struct grid *gd, u_int py)
233: {
234: if (grid_check_y(gd, py) != 0)
235: return (NULL);
236: return (&gd->linedata[py]);
237: }
238:
1.1 nicm 239: /* Get cell for reading. */
240: const struct grid_cell *
241: grid_peek_cell(struct grid *gd, u_int px, u_int py)
242: {
243: if (grid_check_y(gd, py) != 0)
244: return (&grid_default_cell);
245:
1.10 nicm 246: if (px >= gd->linedata[py].cellsize)
1.1 nicm 247: return (&grid_default_cell);
1.10 nicm 248: return (&gd->linedata[py].celldata[px]);
1.1 nicm 249: }
250:
251: /* Get cell at relative position (for writing). */
252: struct grid_cell *
253: grid_get_cell(struct grid *gd, u_int px, u_int py)
254: {
255: if (grid_check_y(gd, py) != 0)
256: return (NULL);
257:
258: grid_expand_line(gd, py, px + 1);
1.10 nicm 259: return (&gd->linedata[py].celldata[px]);
1.1 nicm 260: }
261:
262: /* Set cell at relative position. */
263: void
1.31 nicm 264: grid_set_cell(struct grid *gd, u_int px, u_int py, const struct grid_cell *gc)
1.1 nicm 265: {
266: if (grid_check_y(gd, py) != 0)
267: return;
268:
269: grid_expand_line(gd, py, px + 1);
270: grid_put_cell(gd, px, py, gc);
271: }
272:
1.14 nicm 273: /* Clear area. */
1.1 nicm 274: void
275: grid_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny)
276: {
277: u_int xx, yy;
278:
279: if (nx == 0 || ny == 0)
280: return;
281:
282: if (px == 0 && nx == gd->sx) {
283: grid_clear_lines(gd, py, ny);
284: return;
285: }
286:
287: if (grid_check_y(gd, py) != 0)
288: return;
289: if (grid_check_y(gd, py + ny - 1) != 0)
290: return;
291:
292: for (yy = py; yy < py + ny; yy++) {
1.14 nicm 293: if (px >= gd->linedata[yy].cellsize)
294: continue;
295: if (px + nx >= gd->linedata[yy].cellsize) {
296: gd->linedata[yy].cellsize = px;
297: continue;
298: }
1.1 nicm 299: for (xx = px; xx < px + nx; xx++) {
1.10 nicm 300: if (xx >= gd->linedata[yy].cellsize)
1.1 nicm 301: break;
302: grid_put_cell(gd, xx, yy, &grid_default_cell);
303: }
304: }
305: }
306:
307: /* Clear lines. This just frees and truncates the lines. */
308: void
309: grid_clear_lines(struct grid *gd, u_int py, u_int ny)
310: {
1.10 nicm 311: struct grid_line *gl;
312: u_int yy;
1.1 nicm 313:
314: if (ny == 0)
315: return;
316:
317: if (grid_check_y(gd, py) != 0)
318: return;
319: if (grid_check_y(gd, py + ny - 1) != 0)
320: return;
321:
322: for (yy = py; yy < py + ny; yy++) {
1.10 nicm 323: gl = &gd->linedata[yy];
1.20 nicm 324: free(gl->celldata);
1.10 nicm 325: memset(gl, 0, sizeof *gl);
1.1 nicm 326: }
327: }
328:
329: /* Move a group of lines. */
330: void
331: grid_move_lines(struct grid *gd, u_int dy, u_int py, u_int ny)
332: {
333: u_int yy;
334:
335: if (ny == 0 || py == dy)
336: return;
337:
338: if (grid_check_y(gd, py) != 0)
339: return;
340: if (grid_check_y(gd, py + ny - 1) != 0)
341: return;
342: if (grid_check_y(gd, dy) != 0)
343: return;
344: if (grid_check_y(gd, dy + ny - 1) != 0)
345: return;
346:
347: /* Free any lines which are being replaced. */
348: for (yy = dy; yy < dy + ny; yy++) {
349: if (yy >= py && yy < py + ny)
350: continue;
351: grid_clear_lines(gd, yy, 1);
352: }
353:
1.10 nicm 354: memmove(
355: &gd->linedata[dy], &gd->linedata[py], ny * (sizeof *gd->linedata));
1.1 nicm 356:
357: /* Wipe any lines that have been moved (without freeing them). */
358: for (yy = py; yy < py + ny; yy++) {
359: if (yy >= dy && yy < dy + ny)
360: continue;
1.10 nicm 361: memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);
1.1 nicm 362: }
363: }
364:
365: /* Move a group of cells. */
366: void
367: grid_move_cells(struct grid *gd, u_int dx, u_int px, u_int py, u_int nx)
368: {
1.10 nicm 369: struct grid_line *gl;
370: u_int xx;
1.1 nicm 371:
372: if (nx == 0 || px == dx)
373: return;
374:
375: if (grid_check_y(gd, py) != 0)
376: return;
1.10 nicm 377: gl = &gd->linedata[py];
1.1 nicm 378:
379: grid_expand_line(gd, py, px + nx);
380: grid_expand_line(gd, py, dx + nx);
1.10 nicm 381: memmove(
382: &gl->celldata[dx], &gl->celldata[px], nx * sizeof *gl->celldata);
1.1 nicm 383:
384: /* Wipe any cells that have been moved. */
385: for (xx = px; xx < px + nx; xx++) {
386: if (xx >= dx && xx < dx + nx)
387: continue;
388: grid_put_cell(gd, xx, py, &grid_default_cell);
389: }
1.3 nicm 390: }
391:
1.24 nicm 392: /* Get ANSI foreground sequence. */
393: size_t
394: grid_string_cells_fg(const struct grid_cell *gc, int *values)
395: {
396: size_t n;
397:
398: n = 0;
399: if (gc->flags & GRID_FLAG_FG256) {
400: values[n++] = 38;
401: values[n++] = 5;
402: values[n++] = gc->fg;
403: } else {
404: switch (gc->fg) {
405: case 0:
406: case 1:
407: case 2:
408: case 3:
409: case 4:
410: case 5:
411: case 6:
412: case 7:
413: values[n++] = gc->fg + 30;
414: break;
415: case 8:
416: values[n++] = 39;
417: break;
418: case 90:
419: case 91:
420: case 92:
421: case 93:
422: case 94:
423: case 95:
424: case 96:
425: case 97:
426: values[n++] = gc->fg;
427: break;
428: }
429: }
430: return (n);
431: }
432:
433: /* Get ANSI background sequence. */
434: size_t
435: grid_string_cells_bg(const struct grid_cell *gc, int *values)
436: {
437: size_t n;
438:
439: n = 0;
440: if (gc->flags & GRID_FLAG_BG256) {
441: values[n++] = 48;
442: values[n++] = 5;
443: values[n++] = gc->bg;
444: } else {
445: switch (gc->bg) {
446: case 0:
447: case 1:
448: case 2:
449: case 3:
450: case 4:
451: case 5:
452: case 6:
453: case 7:
454: values[n++] = gc->bg + 40;
455: break;
456: case 8:
457: values[n++] = 49;
458: break;
459: case 100:
460: case 101:
461: case 102:
462: case 103:
463: case 104:
464: case 105:
465: case 106:
466: case 107:
467: values[n++] = gc->bg - 10;
468: break;
469: }
470: }
471: return (n);
472: }
473:
474: /*
475: * Returns ANSI code to set particular attributes (colour, bold and so on)
476: * given a current state. The output buffer must be able to hold at least 57
477: * bytes.
478: */
479: void
480: grid_string_cells_code(const struct grid_cell *lastgc,
1.26 nicm 481: const struct grid_cell *gc, char *buf, size_t len, int escape_c0)
1.24 nicm 482: {
483: int oldc[16], newc[16], s[32];
484: size_t noldc, nnewc, n, i;
485: u_int attr = gc->attr;
486: u_int lastattr = lastgc->attr;
487: char tmp[64];
488:
489: struct {
490: u_int mask;
491: u_int code;
492: } attrs[] = {
493: { GRID_ATTR_BRIGHT, 1 },
494: { GRID_ATTR_DIM, 2 },
495: { GRID_ATTR_ITALICS, 3 },
496: { GRID_ATTR_UNDERSCORE, 4 },
497: { GRID_ATTR_BLINK, 5 },
498: { GRID_ATTR_REVERSE, 7 },
499: { GRID_ATTR_HIDDEN, 8 }
500: };
501: n = 0;
502:
503: /* If any attribute is removed, begin with 0. */
504: for (i = 0; i < nitems(attrs); i++) {
505: if (!(attr & attrs[i].mask) && (lastattr & attrs[i].mask)) {
506: s[n++] = 0;
1.25 nicm 507: lastattr &= GRID_ATTR_CHARSET;
1.24 nicm 508: break;
509: }
510: }
511: /* For each attribute that is newly set, add its code. */
512: for (i = 0; i < nitems(attrs); i++) {
513: if ((attr & attrs[i].mask) && !(lastattr & attrs[i].mask))
514: s[n++] = attrs[i].code;
515: }
516:
517: /* If the foreground c changed, append its parameters. */
518: nnewc = grid_string_cells_fg(gc, newc);
519: noldc = grid_string_cells_fg(lastgc, oldc);
1.25 nicm 520: if (nnewc != noldc ||
521: memcmp(newc,oldc, nnewc * sizeof newc[0]) != 0) {
1.24 nicm 522: for (i = 0; i < nnewc; i++)
523: s[n++] = newc[i];
524: }
525:
526: /* If the background c changed, append its parameters. */
527: nnewc = grid_string_cells_bg(gc, newc);
528: noldc = grid_string_cells_bg(lastgc, oldc);
1.25 nicm 529: if (nnewc != noldc ||
530: memcmp(newc, oldc, nnewc * sizeof newc[0]) != 0) {
1.24 nicm 531: for (i = 0; i < nnewc; i++)
532: s[n++] = newc[i];
533: }
534:
535: /* If there are any parameters, append an SGR code. */
536: *buf = '\0';
537: if (n > 0) {
1.26 nicm 538: if (escape_c0)
539: strlcat(buf, "\\033[", len);
540: else
541: strlcat(buf, "\033[", len);
1.24 nicm 542: for (i = 0; i < n; i++) {
543: if (i + 1 < n)
544: xsnprintf(tmp, sizeof tmp, "%d;", s[i]);
545: else
546: xsnprintf(tmp, sizeof tmp, "%d", s[i]);
547: strlcat(buf, tmp, len);
548: }
549: strlcat(buf, "m", len);
550: }
551:
552: /* Append shift in/shift out if needed. */
1.26 nicm 553: if ((attr & GRID_ATTR_CHARSET) && !(lastattr & GRID_ATTR_CHARSET)) {
554: if (escape_c0)
555: strlcat(buf, "\\016", len); /* SO */
556: else
557: strlcat(buf, "\016", len); /* SO */
558: }
559: if (!(attr & GRID_ATTR_CHARSET) && (lastattr & GRID_ATTR_CHARSET)) {
560: if (escape_c0)
561: strlcat(buf, "\\017", len); /* SI */
562: else
563: strlcat(buf, "\017", len); /* SI */
564: }
1.24 nicm 565: }
566:
1.3 nicm 567: /* Convert cells into a string. */
568: char *
1.24 nicm 569: grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
1.28 nicm 570: struct grid_cell **lastgc, int with_codes, int escape_c0, int trim)
1.3 nicm 571: {
1.17 nicm 572: const struct grid_cell *gc;
1.24 nicm 573: static struct grid_cell lastgc1;
1.21 nicm 574: struct utf8_data ud;
1.26 nicm 575: const char* data;
1.24 nicm 576: char *buf, code[128];
1.26 nicm 577: size_t len, off, size, codelen;
1.16 nicm 578: u_int xx;
1.30 nicm 579: const struct grid_line *gl;
1.3 nicm 580:
1.29 nicm 581: if (lastgc != NULL && *lastgc == NULL) {
1.24 nicm 582: memcpy(&lastgc1, &grid_default_cell, sizeof lastgc1);
583: *lastgc = &lastgc1;
584: }
585:
1.3 nicm 586: len = 128;
587: buf = xmalloc(len);
588: off = 0;
589:
1.30 nicm 590: gl = grid_peek_line(gd, py);
1.3 nicm 591: for (xx = px; xx < px + nx; xx++) {
1.30 nicm 592: if (gl == NULL || xx >= gl->cellsize)
593: break;
594: gc = &gl->celldata[xx];
1.3 nicm 595: if (gc->flags & GRID_FLAG_PADDING)
596: continue;
1.21 nicm 597: grid_cell_get(gc, &ud);
1.3 nicm 598:
1.24 nicm 599: if (with_codes) {
1.26 nicm 600: grid_string_cells_code(*lastgc, gc, code, sizeof code,
601: escape_c0);
1.24 nicm 602: codelen = strlen(code);
603: memcpy(*lastgc, gc, sizeof *gc);
604: } else
605: codelen = 0;
606:
1.26 nicm 607: data = ud.data;
608: size = ud.size;
609: if (escape_c0 && size == 1 && *data == '\\') {
1.27 nicm 610: data = "\\\\";
1.26 nicm 611: size = 2;
612: }
613:
614: while (len < off + size + codelen + 1) {
1.21 nicm 615: buf = xrealloc(buf, 2, len);
616: len *= 2;
617: }
1.3 nicm 618:
1.24 nicm 619: if (codelen != 0) {
620: memcpy(buf + off, code, codelen);
621: off += codelen;
622: }
1.26 nicm 623: memcpy(buf + off, data, size);
624: off += size;
1.3 nicm 625: }
1.17 nicm 626:
1.37 ! nicm 627: if (trim) {
1.28 nicm 628: while (off > 0 && buf[off - 1] == ' ')
629: off--;
1.32 nicm 630: }
1.3 nicm 631: buf[off] = '\0';
1.26 nicm 632:
1.3 nicm 633: return (buf);
1.7 nicm 634: }
635:
1.17 nicm 636: /*
1.7 nicm 637: * Duplicate a set of lines between two grids. If there aren't enough lines in
638: * either source or destination, the number of lines is limited to the number
639: * available.
640: */
641: void
1.31 nicm 642: grid_duplicate_lines(struct grid *dst, u_int dy, struct grid *src, u_int sy,
643: u_int ny)
1.7 nicm 644: {
1.10 nicm 645: struct grid_line *dstl, *srcl;
646: u_int yy;
1.7 nicm 647:
648: if (dy + ny > dst->hsize + dst->sy)
649: ny = dst->hsize + dst->sy - dy;
650: if (sy + ny > src->hsize + src->sy)
651: ny = src->hsize + src->sy - sy;
652: grid_clear_lines(dst, dy, ny);
653:
654: for (yy = 0; yy < ny; yy++) {
1.11 nicm 655: srcl = &src->linedata[sy];
656: dstl = &dst->linedata[dy];
1.10 nicm 657:
658: memcpy(dstl, srcl, sizeof *dstl);
659: if (srcl->cellsize != 0) {
660: dstl->celldata = xcalloc(
661: srcl->cellsize, sizeof *dstl->celldata);
662: memcpy(dstl->celldata, srcl->celldata,
663: srcl->cellsize * sizeof *dstl->celldata);
1.7 nicm 664: }
665:
1.10 nicm 666: sy++;
667: dy++;
1.7 nicm 668: }
1.22 nicm 669: }
670:
1.23 nicm 671: /* Join line data. */
672: void
673: grid_reflow_join(struct grid *dst, u_int *py, struct grid_line *src_gl,
674: u_int new_x)
675: {
676: struct grid_line *dst_gl = &dst->linedata[(*py) - 1];
677: u_int left, to_copy, ox, nx;
678:
679: /* How much is left on the old line? */
680: left = new_x - dst_gl->cellsize;
681:
682: /* Work out how much to append. */
683: to_copy = src_gl->cellsize;
684: if (to_copy > left)
685: to_copy = left;
686: ox = dst_gl->cellsize;
687: nx = ox + to_copy;
688:
689: /* Resize the destination line. */
690: dst_gl->celldata = xrealloc(dst_gl->celldata, nx,
691: sizeof *dst_gl->celldata);
692: dst_gl->cellsize = nx;
693:
694: /* Append as much as possible. */
695: memcpy(&dst_gl->celldata[ox], &src_gl->celldata[0],
696: to_copy * sizeof src_gl->celldata[0]);
697:
698: /* If there is any left in the source, split it. */
699: if (src_gl->cellsize > to_copy) {
700: dst_gl->flags |= GRID_LINE_WRAPPED;
701:
702: src_gl->cellsize -= to_copy;
703: grid_reflow_split(dst, py, src_gl, new_x, to_copy);
704: }
705: }
706:
707: /* Split line data. */
708: void
709: grid_reflow_split(struct grid *dst, u_int *py, struct grid_line *src_gl,
710: u_int new_x, u_int offset)
711: {
712: struct grid_line *dst_gl = NULL;
713: u_int to_copy;
714:
715: /* Loop and copy sections of the source line. */
716: while (src_gl->cellsize > 0) {
717: /* Create new line. */
718: if (*py >= dst->hsize + dst->sy)
719: grid_scroll_history(dst);
720: dst_gl = &dst->linedata[*py];
721: (*py)++;
722:
723: /* How much should we copy? */
724: to_copy = new_x;
725: if (to_copy > src_gl->cellsize)
726: to_copy = src_gl->cellsize;
727:
728: /* Expand destination line. */
729: dst_gl->celldata = xmalloc(to_copy * sizeof *dst_gl->celldata);
730: dst_gl->cellsize = to_copy;
731: dst_gl->flags |= GRID_LINE_WRAPPED;
732:
733: /* Copy the data. */
1.35 nicm 734: memcpy(&dst_gl->celldata[0], &src_gl->celldata[offset],
1.23 nicm 735: to_copy * sizeof dst_gl->celldata[0]);
736:
737: /* Move offset and reduce old line size. */
738: offset += to_copy;
739: src_gl->cellsize -= to_copy;
740: }
741:
742: /* Last line is not wrapped. */
743: if (dst_gl != NULL)
744: dst_gl->flags &= ~GRID_LINE_WRAPPED;
745: }
746:
747: /* Move line data. */
748: void
749: grid_reflow_move(struct grid *dst, u_int *py, struct grid_line *src_gl)
750: {
751: struct grid_line *dst_gl;
752:
753: /* Create new line. */
754: if (*py >= dst->hsize + dst->sy)
755: grid_scroll_history(dst);
756: dst_gl = &dst->linedata[*py];
757: (*py)++;
758:
759: /* Copy the old line. */
760: memcpy(dst_gl, src_gl, sizeof *dst_gl);
761: dst_gl->flags &= ~GRID_LINE_WRAPPED;
762:
763: /* Clear old line. */
764: src_gl->celldata = NULL;
765: }
766:
1.22 nicm 767: /*
1.23 nicm 768: * Reflow lines from src grid into dst grid of width new_x. Returns number of
769: * lines fewer in the visible area. The source grid is destroyed.
1.22 nicm 770: */
771: u_int
1.23 nicm 772: grid_reflow(struct grid *dst, struct grid *src, u_int new_x)
1.22 nicm 773: {
1.23 nicm 774: u_int py, sy, line;
1.22 nicm 775: int previous_wrapped;
1.23 nicm 776: struct grid_line *src_gl;
777:
778: py = 0;
779: sy = src->sy;
1.22 nicm 780:
1.23 nicm 781: previous_wrapped = 0;
782: for (line = 0; line < sy + src->hsize; line++) {
783: src_gl = src->linedata + line;
1.22 nicm 784: if (!previous_wrapped) {
1.23 nicm 785: /* Wasn't wrapped. If smaller, move to destination. */
786: if (src_gl->cellsize <= new_x)
787: grid_reflow_move(dst, &py, src_gl);
788: else
789: grid_reflow_split(dst, &py, src_gl, new_x, 0);
790: } else {
791: /* Previous was wrapped. Try to join. */
792: grid_reflow_join(dst, &py, src_gl, new_x);
1.22 nicm 793: }
1.23 nicm 794: previous_wrapped = src_gl->flags & GRID_LINE_WRAPPED;
1.22 nicm 795: }
796:
1.23 nicm 797: grid_destroy(src);
798:
799: if (py > sy)
1.22 nicm 800: return (0);
1.23 nicm 801: return (sy - py);
1.1 nicm 802: }
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