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