link.c

   1 /* lot's of code c&p-ed directly from mupdf */
   2 #ifdef _WIN32
   3 #define WIN32_LEAN_AND_MEAN
   4 #include <windows.h>
   5 #include <winsock2.h>
   6 #define ssize_t int
   7 #pragma warning (disable:4244)
   8 #pragma warning (disable:4996)
   9 #pragma warning (disable:4995)
  10 #endif
  11
  12 #ifdef _MSC_VER
  13 #include <errno.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <stdlib.h>
  17 static void __declspec (noreturn) err (int exitcode, const char *fmt, ...)
  18 {
  19     va_list ap;
  20     int errcode;
  21
  22     errcode = errno;
  23     va_start (ap, fmt);
  24     vfprintf (stderr, fmt, ap);
  25     va_end (ap);
  26     fprintf (stderr, ": %s\n", strerror (errno));
  27     exit (exitcode);
  28 }
  29 static void __declspec (noreturn) errx (int exitcode, const char *fmt, ...)
  30 {
  31     va_list ap;
  32     int errcode;
  33
  34     errcode = errno;
  35     va_start (ap, fmt);
  36     vfprintf (stderr, fmt, ap);
  37     va_end (ap);
  38     fputc ('\n', stderr);
  39     exit (exitcode);
  40 }
  41 static void __declspec (noreturn) sockerr (int exitcode, const char *fmt, ...)
  42 {
  43     va_list ap;
  44     int errcode;
  45
  46     errcode = errno;
  47     va_start (ap, fmt);
  48     vfprintf (stderr, fmt, ap);
  49     va_end (ap);
  50     fprintf (stderr, ": wsaerror %lx\n", WSAGetLastError ());
  51     exit (exitcode);
  52 }
  53 #else
  54 #define _GNU_SOURCE
  55 #include <err.h>
  56 #define sockerr err
  57 #endif
  58 #include <regex.h>
  59 #include <errno.h>
  60 #include <ctype.h>
  61 #include <stdio.h>
  62 #include <stdarg.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #ifndef _WIN32
  67 #include <pthread.h>
  68 #include <sys/time.h>
  69 #include <sys/types.h>
  70 #include <sys/socket.h>
  71 #include <sys/select.h>
  72 #endif
  73
  74 #ifdef __APPLE__
  75 #include <OpenGL/gl.h>
  76 #else
  77 #include <GL/gl.h>
  78 #endif
  79
  80 #ifndef GL_TEXTURE_RECTANGLE_ARB
  81 #define GL_TEXTURE_RECTANGLE_ARB          0x84F5
  82 #endif
  83
  84 #include <caml/fail.h>
  85 #include <caml/alloc.h>
  86 #include <caml/memory.h>
  87 #include <caml/unixsupport.h>
  88
  89 #include <fitz.h>
  90 #include <mupdf.h>
  91
  92 #if 0
  93 #define lprintf printf
  94 #else
  95 #define lprintf(...)
  96 #endif
  97
  98 #define ARSERT(cond) for (;;) {                         \
  99     if (!(cond)) {                                      \
 100         errx (1, "%s:%d " #cond, __FILE__, __LINE__);   \
 101     }                                                   \
 102     break;                                              \
 103 }
 104
 105 struct slice {
 106     int texindex;
 107     int w, h;
 108 };
 109
 110 struct page {
 111     int pageno;
 112     int slicecount;
 113     fz_textspan *text;
 114     fz_pixmap *pixmap;
 115     pdf_page *drawpage;
 116     struct pagedim *pagedim;
 117     struct page *prev;
 118     struct slice slices[];
 119 };
 120
 121 struct pagedim {
 122     int pageno;
 123     int rotate;
 124     fz_rect box;
 125     fz_bbox bbox;
 126     fz_matrix ctm, ctm1;
 127 };
 128
 129 struct {
 130     int sock;
 131     int sliceheight;
 132     struct page *pages;
 133     struct pagedim *pagedims;
 134     int pagecount;
 135     int pagedimcount;
 136     pdf_xref *xref;
 137     fz_glyphcache *cache;
 138     int w, h;
 139
 140     int texindex;
 141     int texcount;
 142     GLuint *texids;
 143
 144     GLenum texform;
 145     GLenum texty;
 146
 147     int lotsamemory;
 148
 149     int *pagetbl;
 150     struct {
 151         int w, h;
 152         struct slice *slice;
 153     } *texowners;
 154
 155     int rotate;
 156
 157 #ifdef _WIN32
 158     HANDLE thread;
 159 #else
 160     pthread_t thread;
 161 #endif
 162 } state;
 163
 164 #ifdef _WIN32
 165 static CRITICAL_SECTION critsec;
 166
 167 static void lock (void *unused)
 168 {
 169     (void) unused;
 170     EnterCriticalSection (&critsec);
 171 }
 172
 173 static void unlock (void *unused)
 174 {
 175     (void) unused;
 176     LeaveCriticalSection (&critsec);
 177 }
 178
 179 static int trylock (void *unused)
 180 {
 181     return TryEnterCriticalSection (&critsec) == 0;
 182 }
 183 #else
 184 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 185
 186 static void lock (const char *cap)
 187 {
 188     int ret = pthread_mutex_lock (&mutex);
 189     if (ret) {
 190         errx (1, "%s: pthread_mutex_lock: %s", cap, strerror (ret));
 191     }
 192 }
 193
 194 static void unlock (const char *cap)
 195 {
 196     int ret = pthread_mutex_unlock (&mutex);
 197     if (ret) {
 198         errx (1, "%s: pthread_mutex_unlock: %s", cap, strerror (ret));
 199     }
 200 }
 201
 202 static int trylock (const char *cap)
 203 {
 204     int ret = pthread_mutex_trylock (&mutex);
 205
 206     if (ret && ret != EBUSY) {
 207         errx (1, "%s: pthread_mutex_trylock: %s", cap, strerror (ret));
 208     }
 209     return ret == EBUSY;
 210 }
 211 #endif
 212
 213 static void *parse_pointer (const char *cap, const char *s)
 214 {
 215     int ret;
 216     void *ptr;
 217
 218     ret = sscanf (s, "%p", &ptr);
 219     if (ret != 1) {
 220         errx (1, "%s: cannot parse pointer in `%s'", cap, s);
 221     }
 222     return ptr;
 223 }
 224
 225 static int hasdata (int sock)
 226 {
 227     int n;
 228     fd_set s;
 229     struct timeval tv;
 230     FD_ZERO (&s);
 231     FD_SET (sock, &s);
 232     tv.tv_sec = 0;
 233     tv.tv_usec = 0;
 234     n = select (sock + 1, &s, NULL, NULL, &tv);
 235     if (n == 0) return 0;
 236     if (n == 1) return 1;
 237     sockerr (1, "hasdata: select error ret=%d", n);
 238 }
 239
 240 static double now (void)
 241 {
 242     struct timeval tv;
 243
 244     if (gettimeofday (&tv, NULL)) {
 245         err (1, "gettimeofday");
 246     }
 247     return tv.tv_sec + tv.tv_usec*1e-6;
 248 }
 249
 250 static void readdata (int fd, char *p, int size)
 251 {
 252     ssize_t n;
 253
 254     n = recv (fd, p, size, 0);
 255     if (n - size) {
 256         if (!n) errx (1, "EOF while reading");
 257         sockerr (1, "recv (req %d, ret %zd)", size, n);
 258     }
 259 }
 260
 261 static void writedata (int fd, char *p, int size)
 262 {
 263     char buf[4];
 264     ssize_t n;
 265
 266     buf[0] = (size >> 24) & 0xff;
 267     buf[1] = (size >> 16) & 0xff;
 268     buf[2] = (size >>  8) & 0xff;
 269     buf[3] = (size >>  0) & 0xff;
 270
 271     n = send (fd, buf, 4, 0);
 272     if (n != 4) {
 273         if (!n) errx (1, "EOF while writing length");
 274         sockerr (1, "send %zd", n);
 275     }
 276
 277     n = send (fd, p, size, 0);
 278     if (n - size) {
 279         if (!n) errx (1, "EOF while writing data");
 280         sockerr (1, "send (req %d, ret %zd)", size, n);
 281     }
 282 }
 283
 284 static void
 285 #ifdef __GNUC__
 286 __attribute__ ((format (printf, 2, 3)))
 287 #endif
 288     printd (int fd, const char *fmt, ...)
 289 {
 290     int len;
 291     va_list ap;
 292     char buf[200];
 293
 294     va_start (ap, fmt);
 295     len = vsnprintf (buf, sizeof (buf), fmt, ap);
 296     va_end (ap);
 297     writedata (fd, buf, len);
 298 }
 299
 300 static void die (fz_error error)
 301 {
 302     fz_catch (error, "aborting");
 303     if (state.xref)
 304        pdf_freexref (state.xref);
 305     exit (1);
 306 }
 307
 308 static void openxref (char *filename)
 309 {
 310     int fd;
 311     fz_error error;
 312     fz_stream *file;
 313
 314     fd = open (filename, O_BINARY | O_RDONLY, 0666);
 315     if (fd < 0)
 316         die (fz_throw ("cannot open file '%s'", filename));
 317
 318     file = fz_openfile (fd);
 319     error = pdf_openxrefwithstream (&state.xref, file, NULL);
 320     if (error)
 321         die (fz_rethrow(error, "cannot open document '%s'", filename));
 322     fz_dropstream (file);
 323
 324     if (pdf_needspassword (state.xref)) {
 325         die (fz_throw ("password protected"));
 326     }
 327
 328     error = pdf_loadpagetree (state.xref);
 329     if (error) {
 330         die (fz_throw ("cannot load page tree"));
 331     }
 332
 333     state.pagecount = pdf_getpagecount (state.xref);
 334     state.pagetbl = stat_alloc (state.pagecount * sizeof (*state.pagetbl));
 335 }
 336
 337 static int readlen (int fd)
 338 {
 339     ssize_t n;
 340     char p[4];
 341
 342     n = recv (fd, p, 4, 0);
 343     if (n != 4) {
 344         if (!n) errx (1, "EOF while reading length");
 345         sockerr (1, "recv %zd", n);
 346     }
 347
 348     return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
 349 }
 350
 351 static void freepage (struct page *page)
 352 {
 353     int i;
 354     struct page *p;
 355
 356     fz_droppixmap (page->pixmap);
 357     for (p = state.pages; p; p = p->prev) {
 358         if (p->prev == page) {
 359             p->prev = page->prev;
 360             break;
 361         }
 362     }
 363     for (i = 0; i < page->slicecount; ++i) {
 364         struct slice *s = &page->slices[i];
 365         if (s->texindex != -1) {
 366             if (state.texowners[s->texindex].slice == s) {
 367                 state.texowners[s->texindex].slice = NULL;
 368                 ARSERT (state.texowners[s->texindex].w == s->w);
 369                 ARSERT (state.texowners[s->texindex].h >= s->h);
 370             }
 371         }
 372     }
 373     if (page->text) {
 374         fz_freetextspan (page->text);
 375     }
 376     if (page->drawpage) {
 377         pdf_freepage (page->drawpage);
 378     }
 379
 380     free (page);
 381 }
 382
 383 static void subdivide (struct page *p)
 384 {
 385     int i;
 386     int h = p->pixmap->h;
 387     int th = MIN (h, state.sliceheight);
 388
 389     for (i = 0; i < p->slicecount; ++i) {
 390         struct slice *s = &p->slices[i];
 391         s->texindex = -1;
 392         s->h = MIN (th, h);
 393         s->w = p->pixmap->w;
 394         h -= th;
 395     }
 396 }
 397
 398 static void *render (int pageno, int pindex)
 399 {
 400     fz_error error;
 401     int slicecount;
 402     fz_obj *pageobj;
 403     struct page *page;
 404     double start, end;
 405     pdf_page *drawpage;
 406     fz_device *idev;
 407     struct pagedim *pagedim;
 408
 409     start = now ();
 410     printd (state.sock, "V rendering %d", pageno);
 411
 412     pagedim = &state.pagedims[pindex];
 413     slicecount = (pagedim->bbox.y1 - pagedim->bbox.y0
 414                   + state.sliceheight - 1) / state.sliceheight;
 415     slicecount += slicecount == 0;
 416
 417     page = calloc (sizeof (*page)
 418                    + (slicecount * sizeof (struct slice)), 1);
 419     if (!page) {
 420         err (1, "calloc page %d\n", pageno);
 421     }
 422     page->slicecount = slicecount;
 423     page->prev = state.pages;
 424     state.pages = page;
 425
 426     pageobj = pdf_getpageobject (state.xref, pageno);
 427     if (!pageobj)
 428         die (fz_throw ("cannot retrieve info from page %d", pageno));
 429
 430     error = pdf_loadpage (&drawpage, state.xref, pageobj);
 431     if (error)
 432         die (error);
 433
 434     page->pixmap = fz_newpixmapwithrect (fz_devicergb, pagedim->bbox);
 435     fz_clearpixmap (page->pixmap, 0xFF);
 436
 437     idev = fz_newdrawdevice (state.cache, page->pixmap);
 438     if (!idev)
 439         die (fz_throw ("fz_newdrawdevice failed"));
 440     error = pdf_runpage (state.xref, drawpage, idev, pagedim->ctm);
 441     fz_freedevice (idev);
 442
 443     page->drawpage = drawpage;
 444     page->pagedim = pagedim;
 445     page->pageno = pageno;
 446     subdivide (page);
 447     end = now ();
 448
 449     if (!state.lotsamemory) {
 450         pdf_agestore(state.xref->store, 3);
 451     }
 452
 453     printd (state.sock, "V rendering %d took %f sec", pageno, end - start);
 454     return page;
 455 }
 456
 457 static void initpdims (void)
 458 {
 459     int pageno;
 460     double start, end;
 461
 462     start = now ();
 463     for (pageno = 0; pageno < state.pagecount; ++pageno) {
 464         int rotate;
 465         fz_rect box;
 466         struct pagedim *p;
 467         fz_obj *obj, *pageobj;
 468
 469         pageobj = pdf_getpageobject (state.xref, pageno + 1);
 470
 471         obj = fz_dictgets (pageobj, "CropBox");
 472         if (!fz_isarray (obj)) {
 473             obj = fz_dictgets (pageobj, "MediaBox");
 474             if (!fz_isarray (obj)) {
 475                 die (fz_throw ("cannot find page bounds %d (%d Rd)",
 476                                fz_tonum (pageobj), fz_togen (pageobj)));
 477             }
 478         }
 479         box = pdf_torect (obj);
 480
 481         obj = fz_dictgets (pageobj, "Rotate");
 482         if (fz_isint (obj)) {
 483             rotate = fz_toint (obj);
 484         }
 485         else  {
 486             rotate = 0;
 487         }
 488         rotate += state.rotate;
 489
 490         state.pagetbl[pageno] = fz_tonum (state.xref->pagerefs[pageno]);
 491         p = &state.pagedims[state.pagedimcount - 1];
 492         if ((state.pagedimcount == 0)
 493             || (p->rotate != rotate || memcmp (&p->box, &box, sizeof (box)))) {
 494             size_t size;
 495
 496             size = (state.pagedimcount + 1) * sizeof (*state.pagedims);
 497             state.pagedims = realloc (state.pagedims, size);
 498             if (!state.pagedims) {
 499                 err (1, "realloc pagedims to %zu (%d elems)",
 500                      size, state.pagedimcount + 1);
 501             }
 502             p = &state.pagedims[state.pagedimcount++];
 503             p->rotate = rotate;
 504             p->box = box;
 505             p->pageno = pageno;
 506         }
 507     }
 508     end = now ();
 509     printd (state.sock, "T Processed %d pages in %f seconds",
 510             state.pagecount, end - start);
 511 }
 512
 513 static void layout (void)
 514 {
 515     int pindex;
 516     fz_matrix ctm;
 517     fz_rect box, box2;
 518     double zoom, w;
 519     struct pagedim *p = state.pagedims;
 520
 521     pindex = 0;
 522     for (pindex = 0; pindex < state.pagedimcount; ++pindex, ++p) {
 523         box.x0 = MIN (p->box.x0, p->box.x1);
 524         box.y0 = MIN (p->box.y0, p->box.y1);
 525         box.x1 = MAX (p->box.x0, p->box.x1);
 526         box.y1 = MAX (p->box.y0, p->box.y1);
 527
 528         ctm = fz_identity;
 529         ctm = fz_concat (ctm, fz_translate (0, -box.y1));
 530         ctm = fz_concat (ctm, fz_rotate (p->rotate));
 531         box2 = fz_transformrect (ctm, box);
 532         w = box2.x1 - box2.x0;
 533
 534         zoom = (state.w / w);
 535         ctm = fz_identity;
 536         ctm = fz_concat (ctm, fz_translate (0, -box.y1));
 537         ctm = fz_concat (ctm, fz_scale (zoom, -zoom));
 538         memcpy (&p->ctm1, &ctm, sizeof (ctm));
 539         ctm = fz_concat (ctm, fz_rotate (p->rotate));
 540         p->bbox = fz_roundrect (fz_transformrect (ctm, box));
 541         memcpy (&p->ctm, &ctm, sizeof (ctm));
 542     }
 543
 544     while (p-- != state.pagedims)  {
 545         printd (state.sock, "l %d %d %d",
 546                 p->pageno, p->bbox.x1 - p->bbox.x0, p->bbox.y1 - p->bbox.y0);
 547     }
 548 }
 549
 550 static void recurse_outline (pdf_outline *outline, int level)
 551 {
 552     while (outline) {
 553         int i, num;
 554         fz_obj *obj;
 555         int top = 0;
 556         int pageno = -1;
 557
 558         if (!outline->link) goto next;
 559
 560         obj = outline->link->dest;
 561         if (fz_isindirect (obj)) {
 562             num = fz_tonum (obj);
 563
 564             for (i = 0; i < state.pagecount; ++i)  {
 565                 if (state.pagetbl[i] == num) {
 566                     pageno = i;
 567                     break;
 568                 }
 569             }
 570         }
 571         else if (fz_isarray (obj)) {
 572             fz_obj *obj2;
 573
 574             obj2 = fz_arrayget (obj, 0);
 575             if (fz_isint (obj2)) {
 576                 pageno = fz_toint (obj2);
 577             }
 578             else {
 579                 num = fz_tonum (obj2);
 580                 for (i = 0; i < state.pagecount; ++i)  {
 581                     if (state.pagetbl[i] == num) {
 582                         pageno = i;
 583                         break;
 584                     }
 585                 }
 586             }
 587
 588             if (fz_arraylen (obj) > 3) {
 589                 fz_point p;
 590                 struct pagedim *pagedim = state.pagedims;
 591
 592                 for (i = 0; i < state.pagedimcount; ++i) {
 593                     if (state.pagedims[i].pageno > pageno)
 594                         break;
 595                     pagedim = &state.pagedims[i];
 596                 }
 597
 598                 p.x = fz_toint (fz_arrayget (obj, 2));
 599                 p.y = fz_toint (fz_arrayget (obj, 3));
 600                 p = fz_transformpoint (pagedim->ctm, p);
 601                 top = p.y;
 602             }
 603         }
 604
 605         lprintf ("%*c%s %d\n", level, ' ', outline->title, pageno);
 606         printd (state.sock, "o %d %d %d %s",
 607                 level, pageno, top, outline->title);
 608     next:
 609         if (outline->child) {
 610             recurse_outline (outline->child, level + 1);
 611         }
 612         outline = outline->next;
 613     }
 614 }
 615
 616 static void process_outline (void)
 617 {
 618     pdf_outline *outline;
 619
 620     outline = pdf_loadoutline (state.xref);
 621     if (outline) {
 622         recurse_outline (outline, 0);
 623         pdf_freeoutline (outline);
 624     }
 625 }
 626
 627 static int comparespans (const void *l, const void *r)
 628 {
 629     fz_textspan const *const*ls = l;
 630     fz_textspan const *const*rs = r;
 631     return (*ls)->text->bbox.y0 - (*rs)->text->bbox.y0;
 632 }
 633
 634 /* wishful thinking function */
 635 static void search (regex_t *re, int pageno, int y, int forward)
 636 {
 637     int i, j;
 638     int ret;
 639     char *p;
 640     char buf[256];
 641     fz_matrix ctm;
 642     fz_error error;
 643     fz_obj *pageobj;
 644     fz_device *tdev;
 645     pdf_page *drawpage;
 646     fz_textspan *text, *span, **pspan;
 647     struct pagedim *pdim, *pdimprev;
 648     int stop = 0;
 649     int niters = 0;
 650     int nspans;
 651     double start, end;
 652
 653     start = now ();
 654     while (pageno >= 0 && pageno < state.pagecount && !stop) {
 655         if (niters++ == 5) {
 656             if (!state.lotsamemory) {
 657                 pdf_agestore(state.xref->store, 3);
 658             }
 659             niters = 0;
 660             if (hasdata (state.sock)) {
 661                 printd (state.sock, "T attention requested aborting search at %d",
 662                         pageno);
 663                 stop = 1;
 664             }
 665             else {
 666                 printd (state.sock, "T searching in page %d", pageno);
 667             }
 668         }
 669         pdimprev = NULL;
 670         for (i = 0; i < state.pagedimcount; ++i) {
 671             pdim = &state.pagedims[i];
 672             if (pdim->pageno == pageno)  {
 673                 goto found;
 674             }
 675             if (pdim->pageno > pageno) {
 676                 pdim = pdimprev;
 677                 goto found;
 678             }
 679             pdimprev = pdim;
 680         }
 681         pdim = pdimprev;
 682     found:
 683
 684         pageobj = pdf_getpageobject (state.xref, pageno + 1);
 685         if (!pageobj)
 686             die (fz_throw ("cannot retrieve info from page %d", pageno));
 687
 688         error = pdf_loadpage (&drawpage, state.xref, pageobj);
 689         if (error)
 690             die (error);
 691
 692         ctm = fz_rotate (pdim->rotate);
 693
 694         text = fz_newtextspan ();
 695         tdev = fz_newtextdevice (text);
 696         error = pdf_runpage (state.xref, drawpage, tdev, pdim->ctm1);
 697         if (error) die (error);
 698         fz_freedevice (tdev);
 699
 700         nspans = 0;
 701         for (span = text; span; span = span->next) {
 702             nspans++;
 703         }
 704         pspan = malloc (sizeof (void *) * nspans);
 705         if (!pspan) {
 706             err (1, "malloc span pointers %zu", sizeof (void *) * nspans);
 707         }
 708         for (i = 0, span = text; span; span = span->next, ++i) {
 709             pspan[i] = span;
 710         }
 711         qsort (pspan, nspans, sizeof (fz_textspan *), comparespans);
 712
 713         j = forward ? 0 : nspans - 1;
 714         while (nspans--) {
 715             regmatch_t rm;
 716
 717             span = pspan[j];
 718             j += forward ? 1 : -1;
 719             p = buf;
 720             for (i = 0; i < MIN (span->len, (int) sizeof (buf) - 1); ++i) {
 721                 if (forward) {
 722                     if (span->text[i].bbox.y0 < y + 1) {
 723                         continue;
 724                     }
 725                 }
 726                 else {
 727                     if (span->text[i].bbox.y0 > y - 1) {
 728                         continue;
 729                     }
 730                 }
 731                 if (span->text[i].c < 256) {
 732                     *p++ = span->text[i].c;
 733                 }
 734                 else  {
 735                     *p++ = '?';
 736                 }
 737             }
 738             if (p == buf) {
 739                 continue;
 740             }
 741             *p++ = 0;
 742
 743             ret = regexec (re, buf, 1, &rm, 0);
 744             if (ret)  {
 745                 if (ret != REG_NOMATCH) {
 746                     size_t size;
 747                     char errbuf[80];
 748                     size = regerror (ret, re, errbuf, sizeof (errbuf));
 749                     printd (state.sock,
 750                             "T regexec error `%.*s'",
 751                             (int) size, errbuf);
 752                     fz_freetextspan (text);
 753                     pdf_freepage (drawpage);
 754                     free (pspan);
 755                     return;
 756                 }
 757             }
 758             else  {
 759                 int xoff, yoff;
 760                 fz_bbox *sb, *eb;
 761                 fz_point p1, p2, p3, p4;
 762
 763                 xoff = -pdim->bbox.x0;
 764                 yoff = -pdim->bbox.y0;
 765
 766                 sb = &span->text[rm.rm_so].bbox;
 767                 eb = &span->text[rm.rm_eo - 1].bbox;
 768
 769                 p1.x = sb->x0;
 770                 p1.y = sb->y0;
 771                 p2.x = eb->x1;
 772                 p2.y = sb->y0;
 773                 p3.x = eb->x1;
 774                 p3.y = eb->y1;
 775                 p4.x = sb->x0;
 776                 p4.y = eb->y1;
 777
 778                 p1 = fz_transformpoint (ctm, p1);
 779                 p2 = fz_transformpoint (ctm, p2);
 780                 p3 = fz_transformpoint (ctm, p3);
 781                 p4 = fz_transformpoint (ctm, p4);
 782
 783                 if (!stop) {
 784                     printd (state.sock, "F %d %d %f %f %f %f %f %f %f %f",
 785                             pageno, 1,
 786                             p1.x + xoff, p1.y + yoff,
 787                             p2.x + xoff, p2.y + yoff,
 788                             p3.x + xoff, p3.y + yoff,
 789                             p4.x + xoff, p4.y + yoff);
 790
 791                     printd (state.sock, "T found at %d `%.*s' in %f sec",
 792                             pageno, rm.rm_eo - rm.rm_so, &buf[rm.rm_so],
 793                             now () - start);
 794                 }
 795                 else  {
 796                     printd (state.sock, "R %d %d %f %f %f %f %f %f %f %f",
 797                             pageno, 2,
 798                             p1.x + xoff, p1.y + yoff,
 799                             p2.x + xoff, p2.y + yoff,
 800                             p3.x + xoff, p3.y + yoff,
 801                             p4.x + xoff, p4.y + yoff);
 802                 }
 803                 stop = 1;
 804             }
 805         }
 806         if (forward) {
 807             pageno += 1;
 808             y = 0;
 809         }
 810         else {
 811             pageno -= 1;
 812             y = INT_MAX;
 813         }
 814         fz_freetextspan (text);
 815         pdf_freepage (drawpage);
 816         free (pspan);
 817     }
 818     end = now ();
 819     if (!stop)  {
 820         printd (state.sock, "T no matches %f sec", end - start);
 821     }
 822     printd (state.sock, "D");
 823 }
 824
 825 static
 826 #ifdef _WIN32
 827 DWORD _stdcall
 828 #else
 829 void *
 830 #endif
 831 mainloop (void *unused)
 832 {
 833     char *p = NULL;
 834     int len, ret, oldlen = 0;
 835
 836     for (;;) {
 837         len = readlen (state.sock);
 838         if (len == 0) {
 839             errx (1, "readlen returned 0");
 840         }
 841
 842         if (oldlen < len + 1) {
 843             p = realloc (p, len + 1);
 844             if (!p) {
 845                 err (1, "realloc %d failed", len + 1);
 846             }
 847             oldlen = len + 1;
 848         }
 849         readdata (state.sock, p, len);
 850         p[len] = 0;
 851
 852         if (!strncmp ("open", p, 4)) {
 853             fz_obj *obj;
 854             char *filename = p + 5;
 855
 856             openxref (filename);
 857             initpdims ();
 858
 859             obj = fz_dictgets (state.xref->trailer, "Info");
 860             if (obj) {
 861                 obj = fz_dictgets (obj, "Title");
 862                 if (obj) {
 863                     printd (state.sock, "t %s", pdf_toutf8 (obj));
 864                 }
 865             }
 866         }
 867         else if (!strncmp ("free", p, 4)) {
 868             void *ptr;
 869
 870             ret = sscanf (p + 4, " %p", &ptr);
 871             if (ret != 1) {
 872                 errx (1, "malformed free `%.*s' ret=%d", len, p, ret);
 873             }
 874             lock ("free");
 875             freepage (ptr);
 876             unlock ("free");
 877             printd (state.sock, "d");
 878         }
 879         else if (!strncmp ("search", p, 6)) {
 880             int icase, pageno, y, ret, len2, forward;
 881             char *pattern;
 882             regex_t re;
 883
 884             ret = sscanf (p + 6, " %d %d %d %d,%n",
 885                           &icase, &pageno, &y, &forward, &len2);
 886             if (ret != 4) {
 887                 errx (1, "malformed search `%s' ret=%d", p, ret);
 888             }
 889
 890             pattern = p + 6 + len2;
 891             ret = regcomp (&re, pattern,
 892                            REG_EXTENDED | (icase ? REG_ICASE : 0));
 893             if (ret) {
 894                 char errbuf[80];
 895                 size_t size;
 896
 897                 size = regerror (ret, &re, errbuf, sizeof (errbuf));
 898                 printd (state.sock, "T regcomp failed `%.*s'",
 899                         (int) size, errbuf);
 900             }
 901             else  {
 902                 search (&re, pageno, y, forward);
 903                 regfree (&re);
 904             }
 905         }
 906         else if (!strncmp ("geometry", p, 8)) {
 907             int w, h;
 908
 909             printd (state.sock, "c");
 910             ret = sscanf (p + 8, " %d %d", &w, &h);
 911             if (ret != 2) {
 912                 errx (1, "malformed geometry `%.*s' ret=%d", len, p, ret);
 913             }
 914             state.h = h;
 915             if (w != state.w) {
 916                 int i;
 917                 state.w = w;
 918                 for (i = 0; i < state.texcount; ++i)  {
 919                     state.texowners[i].slice = NULL;
 920                 }
 921             }
 922             lock ("geometry");
 923             layout ();
 924             process_outline ();
 925             unlock ("geometry");
 926             printd (state.sock, "C %d", state.pagecount);
 927         }
 928         else if (!strncmp ("rotate", p, 6)) {
 929             float rotate;
 930
 931             printd (state.sock, "c");
 932             ret = sscanf (p + 6, " %f", &rotate);
 933             if (ret != 1) {
 934                 errx (1, "bad rotate line `%.*s' ret=%d", len, p, ret);
 935             }
 936             state.rotate = rotate;
 937             lock ("rotate");
 938             state.pagedimcount = 0;
 939             free (state.pagedims);
 940             state.pagedims = NULL;
 941             initpdims ();
 942             layout ();
 943             process_outline ();
 944             unlock ("rotate");
 945             printd (state.sock, "C %d", state.pagecount);
 946         }
 947         else if (!strncmp ("render", p, 6)) {
 948             int pageno, pindex, w, h, ret;
 949             struct page *page;
 950
 951             ret = sscanf (p + 6, " %d %d %d %d", &pageno, &pindex, &w, &h);
 952             if (ret != 4) {
 953                 errx (1, "bad render line `%.*s' ret=%d", len, p, ret);
 954             }
 955
 956             page = render (pageno, pindex);
 957             printd (state.sock, "r %d %d %d %d %p\n",
 958                     pageno,
 959                     state.w,
 960                     state.h,
 961                     state.rotate,
 962                     page);
 963         }
 964         else if (!strncmp ("interrupt", p, 8)) {
 965             printd (state.sock, "V interrupted");
 966         }
 967         else {
 968             errx (1, "unknown command %.*s", len, p);
 969         }
 970     }
 971     return 0;
 972 }
 973
 974 static void upload2 (struct page *page, int slicenum, const char *cap)
 975 {
 976     int i;
 977     int w, h;
 978     double start, end;
 979     struct slice *slice = &page->slices[slicenum];
 980
 981     w = page->pixmap->w;
 982     h = page->pixmap->h;
 983
 984     ARSERT (w == slice->w);
 985     if (slice->texindex != -1
 986         && state.texowners[slice->texindex].slice == slice) {
 987         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, state.texids[slice->texindex]);
 988     }
 989     else  {
 990         int subimage = 0;
 991         int index = (state.texindex++ % state.texcount);
 992         size_t offset = 0;
 993
 994         for (i = 0; i < slicenum; ++i) {
 995             offset += w * page->slices[i].h * 4;
 996         }
 997
 998         if (state.texowners[index].w == slice->w) {
 999             if (state.texowners[index].h >= slice->h ) {
1000                 subimage = 1;
1001             }
1002             else {
1003                 state.texowners[index].h = slice->h;
1004             }
1005         }
1006         else  {
1007             state.texowners[index].h = slice->h;
1008         }
1009
1010         state.texowners[index].slice = slice;
1011         state.texowners[index].w = slice->w;
1012         slice->texindex = index;
1013
1014         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, state.texids[slice->texindex]);
1015         start = now ();
1016         if (subimage) {
1017             {
1018                 GLenum err = glGetError ();
1019                 if (err != GL_NO_ERROR) {
1020                     printf ("\033[0;31mERROR1 %d %d %#x\033[0m\n", w, slice->h, err);
1021                     abort ();
1022                 }
1023             }
1024             glTexSubImage2D (GL_TEXTURE_RECTANGLE_ARB,
1025                              0,
1026                              0,
1027                              0,
1028                              w,
1029                              slice->h,
1030                              state.texform,
1031                              state.texty,
1032                              page->pixmap->samples + offset
1033                 );
1034             {
1035                 GLenum err = glGetError ();
1036                 if (err != GL_NO_ERROR) {
1037                     printf ("\033[0;31mERROR %d %d %#x\033[0m\n", w, slice->h, err);
1038                     abort ();
1039                 }
1040             }
1041         }
1042         else {
1043             glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
1044                           0,
1045                           GL_RGBA8,
1046                           w,
1047                           slice->h,
1048                           0,
1049                           state.texform,
1050                           state.texty,
1051                           page->pixmap->samples + offset
1052                 );
1053         }
1054
1055         end = now ();
1056         lprintf ("%s[%d] slice=%d(%d,%d) texid=%d %f sec\n",
1057                  subimage ? "sub" : "img",
1058                  page->pageno, slicenum,
1059                  slice->w, slice->h,
1060                  state.texids[slice->texindex],
1061                  end - start);
1062     }
1063 }
1064
1065 CAMLprim value ml_draw (value dispy_v, value w_v, value h_v,
1066                         value py_v, value ptr_v)
1067 {
1068     CAMLparam5 (dispy_v, w_v, h_v, py_v, ptr_v);
1069     int dispy = Int_val (dispy_v);
1070     int w = Int_val (w_v);
1071     int h = Int_val (h_v);
1072     int py = Int_val (py_v);
1073     char *s = String_val (ptr_v);
1074     int ret;
1075     void *ptr;
1076     struct page *page;
1077     int slicenum = 0;
1078
1079     if (trylock ("ml_draw")) {
1080         goto done;
1081     }
1082
1083     ret = sscanf (s, "%p", &ptr);
1084     if (ret != 1) {
1085         errx (1, "cannot parse pointer `%s'", s);
1086     }
1087     page = ptr;
1088
1089     w = page->pixmap->w;
1090
1091     ARSERT (h >= 0 && "ml_draw wrong h");
1092     ARSERT (py <= page->pixmap->h && "ml_draw wrong py");
1093
1094     glEnable (GL_TEXTURE_RECTANGLE_ARB);
1095
1096     for (slicenum = 0; slicenum < page->slicecount; ++slicenum) {
1097         struct slice *slice = &page->slices[slicenum];
1098         if (slice->h > py) {
1099             break;
1100         }
1101         py -= slice->h;
1102     }
1103
1104     h = MIN (state.h, h);
1105     while (h) {
1106         int th;
1107         struct slice *slice = &page->slices[slicenum];
1108
1109         ARSERT (slicenum < page->slicecount && "ml_draw wrong slicenum");
1110
1111         th = MIN (h, slice->h - py);
1112         upload2 (page, slicenum, "upload");
1113
1114         glBegin (GL_QUADS);
1115         {
1116             glTexCoord2i (0, py);
1117             glVertex2i (0, dispy);
1118
1119             glTexCoord2i (w, py);
1120             glVertex2i (w, dispy);
1121
1122             glTexCoord2i (w, py+th);
1123             glVertex2i (w, dispy + th);
1124
1125             glTexCoord2i (0, py+th);
1126             glVertex2i (0, dispy + th);
1127         }
1128         glEnd ();
1129
1130         h -= th;
1131         py = 0;
1132         dispy += th;
1133         slicenum += 1;
1134     }
1135
1136     glDisable (GL_TEXTURE_RECTANGLE_ARB);
1137
1138     unlock ("ml_draw");
1139  done:
1140     CAMLreturn (Val_unit);
1141 }
1142
1143 static pdf_link *getlink (struct page *page, int x, int y)
1144 {
1145     fz_point p;
1146     fz_matrix ctm;
1147     pdf_link *link;
1148
1149     p.x = x + page->pixmap->x;
1150     p.y = y + page->pixmap->y;
1151
1152     ctm = fz_invertmatrix (page->pagedim->ctm);
1153     p = fz_transformpoint (ctm, p);
1154
1155     for (link = page->drawpage->links; link; link = link->next) {
1156         if (p.x >= link->rect.x0 && p.x <= link->rect.x1) {
1157             if (p.y >= link->rect.y0 && p.y <= link->rect.y1) {
1158                 return link;
1159             }
1160         }
1161     }
1162     return NULL;
1163 }
1164
1165 CAMLprim value ml_highlightlinks (value ptr_v, value yoff_v)
1166 {
1167     CAMLparam2 (ptr_v, yoff_v);
1168     pdf_link *link;
1169     struct page *page;
1170     int xoff, yoff = Int_val (yoff_v);
1171     const char *s = String_val (ptr_v);
1172
1173     if (trylock ("ml_highlightlinks")) {
1174         goto done;
1175     }
1176
1177     page = parse_pointer ("ml_highlightlinks", s);
1178
1179     glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
1180     glEnable (GL_LINE_STIPPLE);
1181     glLineStipple (0.5, 0xcccc);
1182
1183     xoff = -page->pixmap->x;
1184     yoff -= page->pixmap->y;
1185
1186     glBegin (GL_QUADS);
1187     for (link = page->drawpage->links; link; link = link->next) {
1188         fz_point p1, p2, p3, p4;
1189         fz_matrix ctm = page->pagedim->ctm;
1190
1191         p1.x = link->rect.x0;
1192         p1.y = link->rect.y0;
1193
1194         p2.x = link->rect.x1;
1195         p2.y = link->rect.y0;
1196
1197         p3.x = link->rect.x1;
1198         p3.y = link->rect.y1;
1199
1200         p4.x = link->rect.x0;
1201         p4.y = link->rect.y1;
1202
1203         p1 = fz_transformpoint (ctm, p1);
1204         p2 = fz_transformpoint (ctm, p2);
1205         p3 = fz_transformpoint (ctm, p3);
1206         p4 = fz_transformpoint (ctm, p4);
1207
1208         switch (link->kind) {
1209         case PDF_LGOTO: glColor3ub (255, 0, 0); break;
1210         case PDF_LURI: glColor3ub (0, 0, 255); break;
1211         default: glColor3ub (0, 0, 0); break;
1212         }
1213
1214         glVertex2f (p1.x + xoff, p1.y + yoff);
1215         glVertex2f (p2.x + xoff, p2.y + yoff);
1216         glVertex2f (p3.x + xoff, p3.y + yoff);
1217         glVertex2f (p4.x + xoff, p4.y + yoff);
1218     }
1219     glEnd ();
1220
1221     glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1222     glDisable (GL_LINE_STIPPLE);
1223     unlock ("ml_highlightlinks");
1224
1225  done:
1226     CAMLreturn (Val_unit);
1227 }
1228
1229 CAMLprim value ml_checklink (value ptr_v, value x_v, value y_v)
1230 {
1231     CAMLparam3 (ptr_v, x_v, y_v);
1232     char *s = String_val (ptr_v);
1233     int ret;
1234
1235     if (trylock ("ml_checklink")) {
1236         ret = 0;
1237     }
1238     else {
1239         pdf_link *link;
1240
1241         link = getlink (parse_pointer ("ml_checklink", s),
1242                         Int_val (x_v), Int_val (y_v));
1243
1244         if (link == NULL) {
1245             ret = 0;
1246         }
1247         else  {
1248             if (link->kind == PDF_LURI) {
1249                 printd (state.sock, "T %s", fz_tostrbuf (link->dest));
1250             }
1251         }
1252         unlock ("ml_checklink");
1253     }
1254     CAMLreturn (Val_bool (ret));
1255 }
1256
1257 CAMLprim value ml_getlink (value ptr_v, value x_v, value y_v)
1258 {
1259     CAMLparam3 (ptr_v, x_v, y_v);
1260     CAMLlocal2 (ret_v, tup_v);
1261     pdf_link *link;
1262     struct page *page;
1263     char *s = String_val (ptr_v);
1264
1265     ret_v = Val_int (0);
1266     if (trylock ("ml_getlink")) {
1267         ret_v = Val_int (0);
1268         goto done;
1269     }
1270
1271     page = parse_pointer ("ml_getlink", s);
1272
1273     link = getlink (page, Int_val (x_v), Int_val (y_v));
1274     if (link) {
1275         switch (link->kind) {
1276         case PDF_LGOTO:
1277             {
1278                 int pageno;
1279                 fz_point p;
1280                 fz_obj *obj;
1281
1282                 pageno = -1;
1283                 obj = fz_arrayget (link->dest, 0);
1284                 if (fz_isindirect (obj)) {
1285                     pageno = pdf_findpageobject (state.xref, obj) - 1;
1286                 }
1287                 else if (fz_isint (obj)) {
1288                     pageno = fz_toint (obj);
1289                 }
1290
1291                 if (fz_arraylen (link->dest) > 3) {
1292                     p.x = fz_toint (fz_arrayget (link->dest, 2));
1293                     p.y = fz_toint (fz_arrayget (link->dest, 3));
1294                     p = fz_transformpoint (page->pagedim->ctm, p);
1295                 }
1296                 else  {
1297                     p.x = 0.0;
1298                     p.y = 0.0;
1299                 }
1300
1301                 tup_v = caml_alloc_tuple (2);
1302                 ret_v = caml_alloc_small (1, 1);
1303                 Field (tup_v, 0) = Val_int (pageno);
1304                 Field (tup_v, 1) = Val_int (p.y);
1305                 Field (ret_v, 0) = tup_v;
1306             }
1307             break;
1308
1309         case PDF_LURI:
1310             printf ("%s\n", fz_tostrbuf (link->dest));
1311             tup_v = caml_alloc_tuple (2);
1312             ret_v = caml_alloc_small (1, 1);
1313             Field (tup_v, 0) = Val_int (-1);
1314             Field (tup_v, 1) = Val_int (0);
1315             Field (ret_v, 0) = tup_v;
1316             break;
1317
1318         default:
1319             printd (state.sock, "T unhandled link kind %d", link->kind);
1320             break;
1321         }
1322     }
1323     unlock ("ml_getlink");
1324
1325  done:
1326     CAMLreturn (ret_v);
1327 }
1328
1329 CAMLprim value ml_gettext (value ptr_v, value rect_v, value oy_v, value rectsel_v)
1330 {
1331     CAMLparam4 (ptr_v, rect_v, oy_v, rect_v);
1332     fz_matrix ctm;
1333     fz_point p1, p2;
1334     struct page *page;
1335     fz_textspan *span;
1336     char *s = String_val (ptr_v);
1337     int rectsel = Bool_val (rectsel_v);
1338     int i, bx0, bx1, by0, by1, x0, x1, y0, y1, oy;
1339
1340     /* stop GCC from complaining about uninitialized variables */
1341 #ifdef __GNUC__
1342     int rx0 = rx0, rx1 = rx1, ry0 = ry0, ry1 = ry1;
1343 #else
1344     int rx0, rx1, ry0, ry1;
1345 #endif
1346
1347     if (trylock ("ml_gettext")) {
1348         goto done;
1349     }
1350
1351     page = parse_pointer ("ml_gettext", s);
1352
1353     oy = Int_val (oy_v);
1354     p1.x = Int_val (Field (rect_v, 0));
1355     p1.y = Int_val (Field (rect_v, 1));
1356     p2.x = Int_val (Field (rect_v, 2));
1357     p2.y = Int_val (Field (rect_v, 3));
1358
1359     if (0) {
1360         glEnable (GL_BLEND);
1361         glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
1362         glBlendFunc (GL_DST_ALPHA, GL_SRC_ALPHA);
1363         glColor4f (0.0f, 0.0f, 0.0f, 0.2f);
1364         glRecti (p1.x, p1.y, p2.x, p2.y);
1365         glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1366         glDisable (GL_BLEND);
1367     }
1368
1369     ctm = page->pagedim->ctm;
1370     if (!page->text) {
1371         fz_error error;
1372         fz_device *tdev;
1373
1374         page->text = fz_newtextspan ();
1375         tdev = fz_newtextdevice (page->text);
1376         error = pdf_runpage (state.xref, page->drawpage, tdev,
1377                              page->pagedim->ctm);
1378         if (error) die (error);
1379         fz_freedevice (tdev);
1380     }
1381
1382     printf ("\033c");
1383
1384     printf ("BBox %f %f %f %f\n", p1.x, p1.y, p2.x, p2.y);
1385     p1.x += page->pixmap->x;
1386     p1.y += page->pixmap->y;
1387     p2.x += page->pixmap->x;
1388     p2.y += page->pixmap->y;
1389     x0 = p1.x;
1390     y0 = p1.y;
1391     x1 = p2.x;
1392     y1 = p2.y;
1393     printf ("BBox %d %d %d %d %d %d\n", x0, y0, x1, y1, oy, page->pageno);
1394
1395     for (span = page->text; span; span = span->next) {
1396         int seen = 0;
1397
1398         /* fz_debugtextspanxml (span); */
1399         for (i = 0; i < span->len; ++i) {
1400             long c;
1401
1402             bx0 = span->text[i].bbox.x0;
1403             bx1 = span->text[i].bbox.x1;
1404             by0 = span->text[i].bbox.y0 + oy;
1405             by1 = span->text[i].bbox.y1 + oy;
1406
1407             if ((bx1 >= x0 && bx0 <= x1 && by1 >= y0 && by0 <= y1)) {
1408                 if (!seen) {
1409                     rx0 = bx0 - page->pixmap->x;
1410                     rx1 = bx1 - page->pixmap->x;
1411                     ry0 = by0;
1412                     ry1 = by1;
1413                 }
1414
1415                 seen = 1;
1416                 c = span->text[i].c;
1417                 if (c < 256) {
1418                     if ((isprint (c) && !isspace (c))) {
1419                         if (!rectsel) {
1420                             bx0 -= page->pixmap->x;
1421                             bx1 -= page->pixmap->x;
1422                             glEnable (GL_BLEND);
1423                             glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1424                             glBlendFunc (GL_DST_ALPHA, GL_SRC_ALPHA);
1425                             glColor4f (0.5f, 0.5f, 0.0f, 0.6f);
1426                             glRecti (bx0, by0, bx1, by1);
1427                             glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1428                             glDisable (GL_BLEND);
1429                         }
1430                         if (isprint (c) || c ==' ') {
1431                             rx1 = bx1;
1432                             ry1 = by1;
1433                         }
1434                     }
1435                     putc (c, stdout);
1436                 }
1437                 else  {
1438                     putc ('?', stdout);
1439                 }
1440             }
1441         }
1442
1443         if (rectsel) {
1444             if (seen) {
1445                 glEnable (GL_BLEND);
1446                 glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1447                 glBlendFunc (GL_DST_ALPHA, GL_SRC_ALPHA);
1448                 glColor4f (0.5f, 0.5f, 0.0f, 0.6f);
1449                 glRecti (rx0, ry0, rx1, ry1);
1450                 glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1451                 glDisable (GL_BLEND);
1452             }
1453         }
1454
1455         if (seen && span->eol) {
1456             x0 = page->pixmap->x;
1457             putc ('\n', stdout);
1458         }
1459     }
1460     unlock ("ml_gettext");
1461
1462  done:
1463     CAMLreturn (Val_unit);
1464 }
1465
1466 CAMLprim value ml_getpagewh (value pagedimno_v)
1467 {
1468     CAMLparam1 (pagedimno_v);
1469     CAMLlocal1 (ret_v);
1470     int pagedimno = Int_val (pagedimno_v);
1471
1472     ret_v = caml_alloc_small (4 * Double_wosize, Double_array_tag);
1473     Store_double_field (ret_v, 0, state.pagedims[pagedimno].box.x0);
1474     Store_double_field (ret_v, 1, state.pagedims[pagedimno].box.x1);
1475     Store_double_field (ret_v, 2, state.pagedims[pagedimno].box.y0);
1476     Store_double_field (ret_v, 3, state.pagedims[pagedimno].box.y1);
1477     CAMLreturn (ret_v);
1478 }
1479
1480 CAMLprim value ml_init (value sock_v)
1481 {
1482 #ifndef _WIN32
1483     int ret;
1484 #endif
1485     CAMLparam1 (sock_v);
1486
1487     state.texcount = 256;
1488     state.sliceheight = 24;
1489     state.texform = GL_RGBA;
1490     state.texty = GL_UNSIGNED_BYTE;
1491
1492     fz_accelerate ();
1493     state.texids = calloc (state.texcount * sizeof (*state.texids), 1);
1494     if (!state.texids) {
1495         err (1, "calloc texids %zu", state.texcount * sizeof (*state.texids));
1496     }
1497
1498     state.texowners = calloc (state.texcount * sizeof (*state.texowners), 1);
1499     if (!state.texowners) {
1500         err (1, "calloc texowners %zu",
1501              state.texcount * sizeof (*state.texowners));
1502     }
1503
1504     glGenTextures (state.texcount, state.texids);
1505
1506 #ifdef _WIN32
1507     state.sock = Socket_val (sock_v);
1508 #else
1509     state.sock = Int_val (sock_v);
1510 #endif
1511
1512     state.cache = fz_newglyphcache ();
1513     if (!state.cache) {
1514         errx (1, "fz_newglyphcache failed");
1515     }
1516
1517 #ifdef _WIN32
1518     InitializeCriticalSection (&critsec);
1519     state.thread = CreateThread (NULL, 0, mainloop, NULL, 0, NULL);
1520     if (state.thread == INVALID_HANDLE_VALUE) {
1521         errx (1, "CreateThread failed: %lx", GetLastError ());
1522     }
1523 #else
1524     ret = pthread_create (&state.thread, NULL, mainloop, NULL);
1525     if (ret) {
1526         errx (1, "pthread_create: %s", strerror (errno));
1527     }
1528 #endif
1529
1530     CAMLreturn (Val_unit);
1531 }