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 #define FMT_ss "%d"
   8 #ifdef _WIN64
   9 #define FMT_s "%i64u"
  10 #else
  11 #define FMT_s "%u"
  12 #endif
  13 #pragma warning (disable:4244)
  14 #pragma warning (disable:4996)
  15 #pragma warning (disable:4995)
  16 #endif
  17
  18 #ifdef _MSC_VER
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 static void __declspec (noreturn) err (int exitcode, const char *fmt, ...)
  24 {
  25     va_list ap;
  26     int errcode;
  27
  28     errcode = errno;
  29     va_start (ap, fmt);
  30     vfprintf (stderr, fmt, ap);
  31     va_end (ap);
  32     fprintf (stderr, ": %s\n", strerror (errno));
  33     exit (exitcode);
  34 }
  35 static void __declspec (noreturn) errx (int exitcode, const char *fmt, ...)
  36 {
  37     va_list ap;
  38
  39     va_start (ap, fmt);
  40     vfprintf (stderr, fmt, ap);
  41     va_end (ap);
  42     fputc ('\n', stderr);
  43     exit (exitcode);
  44 }
  45 static void __declspec (noreturn) sockerr (int exitcode, const char *fmt, ...)
  46 {
  47     va_list ap;
  48
  49     va_start (ap, fmt);
  50     vfprintf (stderr, fmt, ap);
  51     va_end (ap);
  52     fprintf (stderr, ": wsaerror 0x%x\n", WSAGetLastError ());
  53     exit (exitcode);
  54 }
  55 #else
  56 #define FMT_ss "%zd"
  57 #define FMT_s "%zu"
  58 #define _GNU_SOURCE
  59 #include <err.h>
  60 #define sockerr err
  61 #endif
  62 #include <regex.h>
  63 #include <errno.h>
  64 #include <ctype.h>
  65 #include <stdio.h>
  66 #include <stdarg.h>
  67 #include <stdlib.h>
  68 #include <string.h>
  69 #include <limits.h>
  70 #ifndef _WIN32
  71 #include <pthread.h>
  72 #include <sys/time.h>
  73 #include <sys/types.h>
  74 #include <sys/socket.h>
  75 #include <sys/select.h>
  76 #endif
  77
  78 #ifdef __APPLE__
  79 #include <OpenGL/gl.h>
  80 #else
  81 #include <GL/gl.h>
  82 #endif
  83
  84 #ifndef GL_TEXTURE_RECTANGLE_ARB
  85 #define GL_TEXTURE_RECTANGLE_ARB          0x84F5
  86 #endif
  87
  88 #include <caml/fail.h>
  89 #include <caml/alloc.h>
  90 #include <caml/memory.h>
  91 #include <caml/unixsupport.h>
  92
  93 #include <fitz.h>
  94 #include <mupdf.h>
  95
  96 #if 0
  97 #define lprintf printf
  98 #else
  99 #define lprintf(...)
 100 #endif
 101
 102 #ifdef FT_FREETYPE_H
 103 #include FT_FREETYPE_H
 104 #endif
 105
 106 #define ARSERT(cond) for (;;) {                         \
 107     if (!(cond)) {                                      \
 108         errx (1, "%s:%d " #cond, __FILE__, __LINE__);   \
 109     }                                                   \
 110     break;                                              \
 111 }
 112
 113 struct slice {
 114     int texindex;
 115     int w, h;
 116 };
 117
 118 struct pagedim {
 119     int pageno;
 120     int rotate;
 121     fz_rect box;
 122     fz_bbox bbox;
 123     fz_matrix ctm, ctm1;
 124 };
 125
 126 struct page {
 127     int pageno;
 128     int slicecount;
 129     fz_textspan *text;
 130     fz_pixmap *pixmap;
 131     pdf_page *drawpage;
 132     struct pagedim pagedim;
 133     struct page *prev;
 134     struct mark {
 135         int i;
 136         fz_textspan *span;
 137     } fmark, lmark;
 138     struct slice slices[];
 139 };
 140
 141 #if !defined _WIN32 && !defined __APPLE__
 142 #define USE_XSEL
 143 #endif
 144
 145 struct {
 146     int sock;
 147     int sliceheight;
 148     struct page *pages, *pig;
 149     struct pagedim *pagedims;
 150     int pagecount;
 151     int pagedimcount;
 152     pdf_xref *xref;
 153     fz_glyphcache *cache;
 154     int w, h;
 155
 156     int texindex;
 157     int texcount;
 158     GLuint *texids;
 159
 160     GLenum texform;
 161     GLenum texty;
 162
 163     struct {
 164         int w, h;
 165         struct slice *slice;
 166     } *texowners;
 167
 168     int rotate;
 169
 170 #ifdef _WIN32
 171     HANDLE thread;
 172 #else
 173     pthread_t thread;
 174 #endif
 175     FILE *xselpipe;
 176 } state;
 177
 178 #ifdef _WIN32
 179 static CRITICAL_SECTION critsec;
 180
 181 static void lock (void *unused)
 182 {
 183     (void) unused;
 184     EnterCriticalSection (&critsec);
 185 }
 186
 187 static void unlock (void *unused)
 188 {
 189     (void) unused;
 190     LeaveCriticalSection (&critsec);
 191 }
 192
 193 static int trylock (void *unused)
 194 {
 195     return TryEnterCriticalSection (&critsec) == 0;
 196 }
 197 #else
 198 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 199
 200 static void lock (const char *cap)
 201 {
 202     int ret = pthread_mutex_lock (&mutex);
 203     if (ret) {
 204         errx (1, "%s: pthread_mutex_lock: %s", cap, strerror (ret));
 205     }
 206 }
 207
 208 static void unlock (const char *cap)
 209 {
 210     int ret = pthread_mutex_unlock (&mutex);
 211     if (ret) {
 212         errx (1, "%s: pthread_mutex_unlock: %s", cap, strerror (ret));
 213     }
 214 }
 215
 216 static int trylock (const char *cap)
 217 {
 218     int ret = pthread_mutex_trylock (&mutex);
 219
 220     if (ret && ret != EBUSY) {
 221         errx (1, "%s: pthread_mutex_trylock: %s", cap, strerror (ret));
 222     }
 223     return ret == EBUSY;
 224 }
 225 #endif
 226
 227 static void *parse_pointer (const char *cap, const char *s)
 228 {
 229     int ret;
 230     void *ptr;
 231
 232     ret = sscanf (s, "%p", &ptr);
 233     if (ret != 1) {
 234         errx (1, "%s: cannot parse pointer in `%s'", cap, s);
 235     }
 236     return ptr;
 237 }
 238
 239 static int hasdata (int sock)
 240 {
 241     int n;
 242     fd_set s;
 243     struct timeval tv;
 244     FD_ZERO (&s);
 245     FD_SET (sock, &s);
 246     tv.tv_sec = 0;
 247     tv.tv_usec = 0;
 248     n = select (sock + 1, &s, NULL, NULL, &tv);
 249     if (n == 0) return 0;
 250     if (n == 1) return 1;
 251     sockerr (1, "hasdata: select error ret=%d", n);
 252 }
 253
 254 static double now (void)
 255 {
 256     struct timeval tv;
 257
 258     if (gettimeofday (&tv, NULL)) {
 259         err (1, "gettimeofday");
 260     }
 261     return tv.tv_sec + tv.tv_usec*1e-6;
 262 }
 263
 264 static void readdata (int fd, char *p, int size)
 265 {
 266     ssize_t n;
 267
 268     n = recv (fd, p, size, 0);
 269     if (n - size) {
 270         if (!n) errx (1, "EOF while reading");
 271         sockerr (1, "recv (req %d, ret " FMT_ss ")", size, n);
 272     }
 273 }
 274
 275 static void writedata (int fd, char *p, int size)
 276 {
 277     char buf[4];
 278     ssize_t n;
 279
 280     buf[0] = (size >> 24) & 0xff;
 281     buf[1] = (size >> 16) & 0xff;
 282     buf[2] = (size >>  8) & 0xff;
 283     buf[3] = (size >>  0) & 0xff;
 284
 285     n = send (fd, buf, 4, 0);
 286     if (n != 4) {
 287         if (!n) errx (1, "EOF while writing length");
 288         sockerr (1, "send " FMT_ss, n);
 289     }
 290
 291     n = send (fd, p, size, 0);
 292     if (n - size) {
 293         if (!n) errx (1, "EOF while writing data");
 294         sockerr (1, "send (req %d, ret " FMT_ss ")", size, n);
 295     }
 296 }
 297
 298 static void
 299 #ifdef __GNUC__
 300 __attribute__ ((format (printf, 2, 3)))
 301 #endif
 302     printd (int fd, const char *fmt, ...)
 303 {
 304     int len;
 305     va_list ap;
 306     char buf[200];
 307
 308     va_start (ap, fmt);
 309     len = vsnprintf (buf, sizeof (buf), fmt, ap);
 310     va_end (ap);
 311     writedata (fd, buf, len);
 312 }
 313
 314 static void die (fz_error error)
 315 {
 316     fz_catch (error, "aborting");
 317     if (state.xref)
 318        pdf_freexref (state.xref);
 319     exit (1);
 320 }
 321
 322 static void openxref (char *filename)
 323 {
 324     int fd;
 325     fz_error error;
 326     fz_stream *file;
 327
 328     fd = open (filename, O_BINARY | O_RDONLY, 0666);
 329     if (fd < 0)
 330         die (fz_throw ("cannot open file '%s'", filename));
 331
 332     file = fz_openfile (fd);
 333     error = pdf_openxrefwithstream (&state.xref, file, NULL);
 334     if (error)
 335         die (fz_rethrow(error, "cannot open document '%s'", filename));
 336     fz_close (file);
 337
 338     if (pdf_needspassword (state.xref)) {
 339         die (fz_throw ("password protected"));
 340     }
 341
 342     error = pdf_loadpagetree (state.xref);
 343     if (error) {
 344         die (fz_throw ("cannot load page tree"));
 345     }
 346
 347     state.pagecount = pdf_getpagecount (state.xref);
 348 }
 349
 350 static int readlen (int fd)
 351 {
 352     ssize_t n;
 353     char p[4];
 354
 355     n = recv (fd, p, 4, 0);
 356     if (n != 4) {
 357         if (!n) errx (1, "EOF while reading length");
 358         sockerr (1, "recv " FMT_ss, n);
 359     }
 360
 361     return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
 362 }
 363
 364 static void unlinkpage (struct page *page)
 365 {
 366     int i;
 367     struct page *p;
 368
 369     for (p = state.pages; p; p = p->prev) {
 370         if (p->prev == page) {
 371             p->prev = page->prev;
 372             break;
 373         }
 374     }
 375     for (i = 0; i < page->slicecount; ++i) {
 376         struct slice *s = &page->slices[i];
 377         if (s->texindex != -1) {
 378             if (state.texowners[s->texindex].slice == s) {
 379                 state.texowners[s->texindex].slice = NULL;
 380                 ARSERT (state.texowners[s->texindex].w == s->w);
 381                 ARSERT (state.texowners[s->texindex].h >= s->h);
 382             }
 383         }
 384     }
 385 }
 386
 387 static void freepage (struct page *page)
 388 {
 389     fz_droppixmap (page->pixmap);
 390
 391     unlinkpage (page);
 392
 393     if (page->text) {
 394         fz_freetextspan (page->text);
 395     }
 396     if (page->drawpage) {
 397         pdf_freepage (page->drawpage);
 398     }
 399
 400     free (page);
 401 }
 402
 403 static void subdivide (struct page *p)
 404 {
 405     int i;
 406     int h = p->pixmap->h;
 407     int th = MIN (h, state.sliceheight);
 408
 409     for (i = 0; i < p->slicecount; ++i) {
 410         struct slice *s = &p->slices[i];
 411         s->texindex = -1;
 412         s->h = MIN (th, h);
 413         s->w = p->pixmap->w;
 414         h -= th;
 415     }
 416 }
 417
 418 int compatpdims (struct pagedim *p1, struct pagedim *p2)
 419 {
 420     return p1->rotate == p2->rotate
 421         && !memcmp (&p1->bbox, &p2->bbox, sizeof (p1->bbox))
 422         && !memcmp (&p1->ctm, &p2->ctm, sizeof (p1->ctm));
 423 }
 424
 425 static void *render (int pageno, int pindex)
 426 {
 427     fz_error error;
 428     int slicecount;
 429     fz_obj *pageobj;
 430     struct page *page = NULL;
 431     double start, end;
 432     pdf_page *drawpage;
 433     fz_device *idev;
 434     struct pagedim *pagedim;
 435
 436     start = now ();
 437     printd (state.sock, "V rendering %d", pageno);
 438
 439     pagedim = &state.pagedims[pindex];
 440     slicecount = (pagedim->bbox.y1 - pagedim->bbox.y0
 441                   + state.sliceheight - 1) / state.sliceheight;
 442     slicecount += slicecount == 0;
 443
 444     if (state.pig) {
 445         if (compatpdims (&state.pig->pagedim, pagedim)) {
 446             page = state.pig;
 447             if (page->text) {
 448                 fz_freetextspan (page->text);
 449                 page->text = NULL;
 450             }
 451             if (page->drawpage) {
 452                 pdf_freepage (page->drawpage);
 453                 page->drawpage = NULL;
 454             }
 455         }
 456         else {
 457             freepage (state.pig);
 458         }
 459     }
 460     if (!page) {
 461         page = calloc (sizeof (*page)
 462                        + (slicecount * sizeof (struct slice)), 1);
 463         if (!page) {
 464             err (1, "calloc page %d\n", pageno);
 465         }
 466         page->pixmap = fz_newpixmapwithrect (fz_devicergb, pagedim->bbox);
 467     }
 468
 469     page->slicecount = slicecount;
 470     page->prev = state.pages;
 471     state.pages = page;
 472
 473     pageobj = pdf_getpageobject (state.xref, pageno);
 474     if (!pageobj)
 475         die (fz_throw ("cannot retrieve info from page %d", pageno));
 476
 477     error = pdf_loadpage (&drawpage, state.xref, pageobj);
 478     if (error)
 479         die (error);
 480
 481     fz_clearpixmap (page->pixmap, 0xFF);
 482
 483     idev = fz_newdrawdevice (state.cache, page->pixmap);
 484     if (!idev)
 485         die (fz_throw ("fz_newdrawdevice failed"));
 486     error = pdf_runpage (state.xref, drawpage, idev, pagedim->ctm);
 487     if (error)
 488         die (fz_rethrow (error, "pdf_runpage failed"));
 489     fz_freedevice (idev);
 490
 491     page->drawpage = drawpage;
 492     page->pagedim = *pagedim;
 493     page->pageno = pageno;
 494     subdivide (page);
 495     end = now ();
 496
 497     pdf_agestore(state.xref->store, 3);
 498
 499     printd (state.sock, "V rendering %d took %f sec", pageno, end - start);
 500     state.pig = NULL;
 501     return page;
 502 }
 503
 504 static void initpdims (void)
 505 {
 506     int pageno;
 507     double start, end;
 508
 509     start = now ();
 510     for (pageno = 0; pageno < state.pagecount; ++pageno) {
 511         int rotate;
 512         fz_rect box;
 513         struct pagedim *p;
 514         fz_obj *obj, *pageobj;
 515
 516         pageobj = pdf_getpageobject (state.xref, pageno + 1);
 517
 518         obj = fz_dictgets (pageobj, "CropBox");
 519         if (!fz_isarray (obj)) {
 520             obj = fz_dictgets (pageobj, "MediaBox");
 521             if (!fz_isarray (obj)) {
 522                 die (fz_throw ("cannot find page bounds %d (%d Rd)",
 523                                fz_tonum (pageobj), fz_togen (pageobj)));
 524             }
 525         }
 526         box = pdf_torect (obj);
 527
 528         obj = fz_dictgets (pageobj, "Rotate");
 529         if (fz_isint (obj)) {
 530             rotate = fz_toint (obj);
 531         }
 532         else  {
 533             rotate = 0;
 534         }
 535         rotate += state.rotate;
 536
 537         p = &state.pagedims[state.pagedimcount - 1];
 538         if ((state.pagedimcount == 0)
 539             || (p->rotate != rotate || memcmp (&p->box, &box, sizeof (box)))) {
 540             size_t size;
 541
 542             size = (state.pagedimcount + 1) * sizeof (*state.pagedims);
 543             state.pagedims = realloc (state.pagedims, size);
 544             if (!state.pagedims) {
 545                 err (1, "realloc pagedims to " FMT_s " (%d elems)",
 546                      size, state.pagedimcount + 1);
 547             }
 548             p = &state.pagedims[state.pagedimcount++];
 549             p->rotate = rotate;
 550             p->box = box;
 551             p->pageno = pageno;
 552         }
 553     }
 554     end = now ();
 555     printd (state.sock, "T Processed %d pages in %f seconds",
 556             state.pagecount, end - start);
 557 }
 558
 559 static void layout (void)
 560 {
 561     int pindex;
 562     fz_matrix ctm;
 563     fz_rect box, box2;
 564     double zoom, w;
 565     struct pagedim *p = state.pagedims;
 566
 567     pindex = 0;
 568     for (pindex = 0; pindex < state.pagedimcount; ++pindex, ++p) {
 569         box.x0 = MIN (p->box.x0, p->box.x1);
 570         box.y0 = MIN (p->box.y0, p->box.y1);
 571         box.x1 = MAX (p->box.x0, p->box.x1);
 572         box.y1 = MAX (p->box.y0, p->box.y1);
 573
 574         ctm = fz_identity;
 575         ctm = fz_concat (ctm, fz_translate (0, -box.y1));
 576         ctm = fz_concat (ctm, fz_rotate (p->rotate));
 577         box2 = fz_transformrect (ctm, box);
 578         w = box2.x1 - box2.x0;
 579
 580         zoom = (state.w / w);
 581         ctm = fz_identity;
 582         ctm = fz_concat (ctm, fz_translate (0, -box.y1));
 583         ctm = fz_concat (ctm, fz_scale (zoom, -zoom));
 584         memcpy (&p->ctm1, &ctm, sizeof (ctm));
 585         ctm = fz_concat (ctm, fz_rotate (p->rotate));
 586         p->bbox = fz_roundrect (fz_transformrect (ctm, box));
 587         memcpy (&p->ctm, &ctm, sizeof (ctm));
 588     }
 589
 590     while (p-- != state.pagedims)  {
 591         printd (state.sock, "l %d %d %d",
 592                 p->pageno, p->bbox.x1 - p->bbox.x0, p->bbox.y1 - p->bbox.y0);
 593     }
 594 }
 595
 596 static void recurse_outline (pdf_outline *outline, int level)
 597 {
 598     while (outline) {
 599         int i;
 600         fz_obj *obj;
 601         int top = 0;
 602         int pageno = -1;
 603
 604         if (!outline->link) goto next;
 605
 606         obj = outline->link->dest;
 607         if (fz_isindirect (obj)) {
 608             obj = fz_resolveindirect (obj);
 609         }
 610         if (fz_isarray (obj)) {
 611             fz_obj *obj2;
 612
 613             obj2 = fz_arrayget (obj, 0);
 614             if (fz_isint (obj2)) {
 615                 pageno = fz_toint (obj2);
 616             }
 617             else {
 618                 pageno = pdf_findpageobject (state.xref, obj2) - 1;
 619             }
 620
 621             if (fz_arraylen (obj) > 3) {
 622                 fz_point p;
 623                 struct pagedim *pagedim = state.pagedims;
 624
 625                 for (i = 0; i < state.pagedimcount; ++i) {
 626                     if (state.pagedims[i].pageno > pageno)
 627                         break;
 628                     pagedim = &state.pagedims[i];
 629                 }
 630
 631                 p.x = fz_toint (fz_arrayget (obj, 2));
 632                 p.y = fz_toint (fz_arrayget (obj, 3));
 633                 p = fz_transformpoint (pagedim->ctm, p);
 634                 top = p.y;
 635             }
 636         }
 637
 638         lprintf ("%*c%s %d\n", level, ' ', outline->title, pageno);
 639         printd (state.sock, "o %d %d %d %s",
 640                 level, pageno, top, outline->title);
 641     next:
 642         if (outline->child) {
 643             recurse_outline (outline->child, level + 1);
 644         }
 645         outline = outline->next;
 646     }
 647 }
 648
 649 static void process_outline (void)
 650 {
 651     pdf_outline *outline;
 652
 653     outline = pdf_loadoutline (state.xref);
 654     if (outline) {
 655         recurse_outline (outline, 0);
 656         pdf_freeoutline (outline);
 657     }
 658 }
 659
 660 static int comparespans (const void *l, const void *r)
 661 {
 662     fz_textspan const *const*ls = l;
 663     fz_textspan const *const*rs = r;
 664     return (*ls)->text->bbox.y0 - (*rs)->text->bbox.y0;
 665 }
 666
 667 /* wishful thinking function */
 668 static void search (regex_t *re, int pageno, int y, int forward)
 669 {
 670     int i, j;
 671     int ret;
 672     char *p;
 673     char buf[256];
 674     fz_matrix ctm;
 675     fz_error error;
 676     fz_obj *pageobj;
 677     fz_device *tdev;
 678     pdf_page *drawpage;
 679     fz_textspan *text, *span, **pspan;
 680     struct pagedim *pdim, *pdimprev;
 681     int stop = 0;
 682     int niters = 0;
 683     int nspans;
 684     double start, end;
 685
 686     start = now ();
 687     while (pageno >= 0 && pageno < state.pagecount && !stop) {
 688         if (niters++ == 5) {
 689             pdf_agestore(state.xref->store, 3);
 690             niters = 0;
 691             if (hasdata (state.sock)) {
 692                 printd (state.sock, "T attention requested aborting search at %d",
 693                         pageno);
 694                 stop = 1;
 695             }
 696             else {
 697                 printd (state.sock, "T searching in page %d", pageno);
 698             }
 699         }
 700         pdimprev = NULL;
 701         for (i = 0; i < state.pagedimcount; ++i) {
 702             pdim = &state.pagedims[i];
 703             if (pdim->pageno == pageno)  {
 704                 goto found;
 705             }
 706             if (pdim->pageno > pageno) {
 707                 pdim = pdimprev;
 708                 goto found;
 709             }
 710             pdimprev = pdim;
 711         }
 712         pdim = pdimprev;
 713     found:
 714
 715         pageobj = pdf_getpageobject (state.xref, pageno + 1);
 716         if (!pageobj)
 717             die (fz_throw ("cannot retrieve info from page %d", pageno));
 718
 719         error = pdf_loadpage (&drawpage, state.xref, pageobj);
 720         if (error)
 721             die (error);
 722
 723         ctm = fz_rotate (pdim->rotate);
 724
 725         text = fz_newtextspan ();
 726         tdev = fz_newtextdevice (text);
 727         error = pdf_runpage (state.xref, drawpage, tdev, pdim->ctm1);
 728         if (error) die (error);
 729         fz_freedevice (tdev);
 730
 731         nspans = 0;
 732         for (span = text; span; span = span->next) {
 733             nspans++;
 734         }
 735         pspan = malloc (sizeof (void *) * nspans);
 736         if (!pspan) {
 737             err (1, "malloc span pointers " FMT_s, sizeof (void *) * nspans);
 738         }
 739         for (i = 0, span = text; span; span = span->next, ++i) {
 740             pspan[i] = span;
 741         }
 742         qsort (pspan, nspans, sizeof (fz_textspan *), comparespans);
 743
 744         j = forward ? 0 : nspans - 1;
 745         while (nspans--) {
 746             regmatch_t rm;
 747
 748             span = pspan[j];
 749             j += forward ? 1 : -1;
 750             p = buf;
 751             for (i = 0; i < MIN (span->len, (int) sizeof (buf) - 1); ++i) {
 752                 if (forward) {
 753                     if (span->text[i].bbox.y0 < y + 1) {
 754                         continue;
 755                     }
 756                 }
 757                 else {
 758                     if (span->text[i].bbox.y0 > y - 1) {
 759                         continue;
 760                     }
 761                 }
 762                 if (span->text[i].c < 256) {
 763                     *p++ = span->text[i].c;
 764                 }
 765                 else  {
 766                     *p++ = '?';
 767                 }
 768             }
 769             if (p == buf) {
 770                 continue;
 771             }
 772             *p++ = 0;
 773
 774             ret = regexec (re, buf, 1, &rm, 0);
 775             if (ret)  {
 776                 if (ret != REG_NOMATCH) {
 777                     size_t size;
 778                     char errbuf[80];
 779                     size = regerror (ret, re, errbuf, sizeof (errbuf));
 780                     printd (state.sock,
 781                             "T regexec error `%.*s'",
 782                             (int) size, errbuf);
 783                     fz_freetextspan (text);
 784                     pdf_freepage (drawpage);
 785                     free (pspan);
 786                     return;
 787                 }
 788             }
 789             else  {
 790                 int xoff, yoff;
 791                 fz_bbox *sb, *eb;
 792                 fz_point p1, p2, p3, p4;
 793
 794                 xoff = -pdim->bbox.x0;
 795                 yoff = -pdim->bbox.y0;
 796
 797                 sb = &span->text[rm.rm_so].bbox;
 798                 eb = &span->text[rm.rm_eo - 1].bbox;
 799
 800                 p1.x = sb->x0;
 801                 p1.y = sb->y0;
 802                 p2.x = eb->x1;
 803                 p2.y = sb->y0;
 804                 p3.x = eb->x1;
 805                 p3.y = eb->y1;
 806                 p4.x = sb->x0;
 807                 p4.y = eb->y1;
 808
 809                 p1 = fz_transformpoint (ctm, p1);
 810                 p2 = fz_transformpoint (ctm, p2);
 811                 p3 = fz_transformpoint (ctm, p3);
 812                 p4 = fz_transformpoint (ctm, p4);
 813
 814                 if (!stop) {
 815                     printd (state.sock, "F %d %d %f %f %f %f %f %f %f %f",
 816                             pageno, 1,
 817                             p1.x + xoff, p1.y + yoff,
 818                             p2.x + xoff, p2.y + yoff,
 819                             p3.x + xoff, p3.y + yoff,
 820                             p4.x + xoff, p4.y + yoff);
 821
 822                     printd (state.sock, "T found at %d `%.*s' in %f sec",
 823                             pageno, rm.rm_eo - rm.rm_so, &buf[rm.rm_so],
 824                             now () - start);
 825                 }
 826                 else  {
 827                     printd (state.sock, "R %d %d %f %f %f %f %f %f %f %f",
 828                             pageno, 2,
 829                             p1.x + xoff, p1.y + yoff,
 830                             p2.x + xoff, p2.y + yoff,
 831                             p3.x + xoff, p3.y + yoff,
 832                             p4.x + xoff, p4.y + yoff);
 833                 }
 834                 stop = 1;
 835             }
 836         }
 837         if (forward) {
 838             pageno += 1;
 839             y = 0;
 840         }
 841         else {
 842             pageno -= 1;
 843             y = INT_MAX;
 844         }
 845         fz_freetextspan (text);
 846         pdf_freepage (drawpage);
 847         free (pspan);
 848     }
 849     end = now ();
 850     if (!stop)  {
 851         printd (state.sock, "T no matches %f sec", end - start);
 852     }
 853     printd (state.sock, "D");
 854 }
 855
 856 static
 857 #ifdef _WIN32
 858 DWORD _stdcall
 859 #else
 860 void *
 861 #endif
 862 mainloop (void *unused)
 863 {
 864     char *p = NULL;
 865     int len, ret, oldlen = 0;
 866
 867     for (;;) {
 868         len = readlen (state.sock);
 869         if (len == 0) {
 870             errx (1, "readlen returned 0");
 871         }
 872
 873         if (oldlen < len + 1) {
 874             p = realloc (p, len + 1);
 875             if (!p) {
 876                 err (1, "realloc %d failed", len + 1);
 877             }
 878             oldlen = len + 1;
 879         }
 880         readdata (state.sock, p, len);
 881         p[len] = 0;
 882
 883         if (!strncmp ("open", p, 4)) {
 884             fz_obj *obj;
 885             char *filename = p + 5;
 886
 887             openxref (filename);
 888             initpdims ();
 889
 890             obj = fz_dictgets (state.xref->trailer, "Info");
 891             if (obj) {
 892                 obj = fz_dictgets (obj, "Title");
 893                 if (obj) {
 894                     printd (state.sock, "t %s", pdf_toutf8 (obj));
 895                 }
 896             }
 897         }
 898         else if (!strncmp ("free", p, 4)) {
 899             void *ptr;
 900
 901             ret = sscanf (p + 4, " %p", &ptr);
 902             if (ret != 1) {
 903                 errx (1, "malformed free `%.*s' ret=%d", len, p, ret);
 904             }
 905             unlinkpage (ptr);
 906             state.pig = ptr;
 907         }
 908         else if (!strncmp ("search", p, 6)) {
 909             int icase, pageno, y, ret, len2, forward;
 910             char *pattern;
 911             regex_t re;
 912
 913             ret = sscanf (p + 6, " %d %d %d %d,%n",
 914                           &icase, &pageno, &y, &forward, &len2);
 915             if (ret != 4) {
 916                 errx (1, "malformed search `%s' ret=%d", p, ret);
 917             }
 918
 919             pattern = p + 6 + len2;
 920             ret = regcomp (&re, pattern,
 921                            REG_EXTENDED | (icase ? REG_ICASE : 0));
 922             if (ret) {
 923                 char errbuf[80];
 924                 size_t size;
 925
 926                 size = regerror (ret, &re, errbuf, sizeof (errbuf));
 927                 printd (state.sock, "T regcomp failed `%.*s'",
 928                         (int) size, errbuf);
 929             }
 930             else  {
 931                 search (&re, pageno, y, forward);
 932                 regfree (&re);
 933             }
 934         }
 935         else if (!strncmp ("geometry", p, 8)) {
 936             int w, h;
 937
 938             printd (state.sock, "c");
 939             ret = sscanf (p + 8, " %d %d", &w, &h);
 940             if (ret != 2) {
 941                 errx (1, "malformed geometry `%.*s' ret=%d", len, p, ret);
 942             }
 943
 944             lock ("geometry");
 945             state.h = h;
 946             if (w != state.w) {
 947                 int i;
 948                 state.w = w;
 949                 for (i = 0; i < state.texcount; ++i)  {
 950                     state.texowners[i].slice = NULL;
 951                 }
 952             }
 953             layout ();
 954             process_outline ();
 955             unlock ("geometry");
 956             printd (state.sock, "C %d", state.pagecount);
 957         }
 958         else if (!strncmp ("rotate", p, 6)) {
 959             float rotate;
 960
 961             printd (state.sock, "c");
 962             ret = sscanf (p + 6, " %f", &rotate);
 963             if (ret != 1) {
 964                 errx (1, "bad rotate line `%.*s' ret=%d", len, p, ret);
 965             }
 966             lock ("rotate");
 967             state.rotate = rotate;
 968             state.pagedimcount = 0;
 969             free (state.pagedims);
 970             state.pagedims = NULL;
 971             initpdims ();
 972             layout ();
 973             process_outline ();
 974             if (state.pig) {
 975                 freepage (state.pig);
 976                 state.pig = NULL;
 977             }
 978             unlock ("rotate");
 979             printd (state.sock, "C %d", state.pagecount);
 980         }
 981         else if (!strncmp ("render", p, 6)) {
 982             int pageno, pindex, w, h, ret;
 983             struct page *page;
 984
 985             ret = sscanf (p + 6, " %d %d %d %d", &pageno, &pindex, &w, &h);
 986             if (ret != 4) {
 987                 errx (1, "bad render line `%.*s' ret=%d", len, p, ret);
 988             }
 989
 990             lock ("render");
 991             page = render (pageno, pindex);
 992             unlock ("render");
 993
 994             printd (state.sock, "r %d %d %d %d %p",
 995                     pageno,
 996                     state.w,
 997                     state.h,
 998                     state.rotate,
 999                     page);
1000         }
1001         else if (!strncmp ("interrupt", p, 9)) {
1002             printd (state.sock, "V interrupted");
1003         }
1004         else {
1005             errx (1, "unknown command %.*s", len, p);
1006         }
1007     }
1008     return 0;
1009 }
1010
1011 static void showsel (struct page *page, int oy)
1012 {
1013     int ox;
1014     fz_bbox bbox;
1015     fz_textspan *span;
1016     struct mark first, last;
1017
1018     first = page->fmark;
1019     last = page->lmark;
1020
1021     if (!first.span || !last.span) return;
1022
1023     glEnable (GL_BLEND);
1024     glBlendFunc (GL_SRC_ALPHA, GL_SRC_ALPHA);
1025     glColor4f (0.5f, 0.5f, 0.0f, 0.6f);
1026
1027     ox = -page->pixmap->x;
1028     oy = -page->pixmap->y + oy;
1029     for (span = first.span; span; span = span->next) {
1030         int i, j, k;
1031
1032         bbox.x0 = bbox.y0 = bbox.x1 = bbox.y1 = 0;
1033
1034         j = 0;
1035         k = span->len - 1;
1036
1037         if (span == page->fmark.span && span == page->lmark.span) {
1038             j = MIN (first.i, last.i);
1039             k = MAX (first.i, last.i);
1040         }
1041         else if (span == first.span) {
1042             j = first.i;
1043         }
1044         else if (span == last.span) {
1045             k = last.i;
1046         }
1047
1048         for (i = j; i <= k; ++i) {
1049             bbox = fz_unionbbox (bbox, span->text[i].bbox);
1050         }
1051         lprintf ("%d %d %d %d oy=%d ox=%d\n",
1052                  bbox.x0,
1053                  bbox.y0,
1054                  bbox.x1,
1055                  bbox.y1,
1056                  oy, ox);
1057
1058         glRecti (bbox.x0 + ox, bbox.y0 + oy, bbox.x1 + ox, bbox.y1 + oy);
1059
1060         if (span == last.span) break;
1061     }
1062     glDisable (GL_BLEND);
1063 }
1064
1065 static void upload2 (struct page *page, int slicenum, const char *cap)
1066 {
1067     int i;
1068     int w, h;
1069     double start, end;
1070     struct slice *slice = &page->slices[slicenum];
1071
1072     w = page->pixmap->w;
1073     h = page->pixmap->h;
1074
1075     ARSERT (w == slice->w);
1076     if (slice->texindex != -1
1077         && state.texowners[slice->texindex].slice == slice) {
1078         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, state.texids[slice->texindex]);
1079     }
1080     else  {
1081         int subimage = 0;
1082         int index = (state.texindex++ % state.texcount);
1083         size_t offset = 0;
1084
1085         for (i = 0; i < slicenum; ++i) {
1086             offset += w * page->slices[i].h * 4;
1087         }
1088
1089         if (state.texowners[index].w == slice->w) {
1090             if (state.texowners[index].h >= slice->h ) {
1091                 subimage = 0;
1092             }
1093             else {
1094                 state.texowners[index].h = slice->h;
1095             }
1096         }
1097         else  {
1098             state.texowners[index].h = slice->h;
1099         }
1100
1101         state.texowners[index].slice = slice;
1102         state.texowners[index].w = slice->w;
1103         slice->texindex = index;
1104
1105         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, state.texids[slice->texindex]);
1106         start = now ();
1107         if (subimage) {
1108             {
1109                 GLenum err = glGetError ();
1110                 if (err != GL_NO_ERROR) {
1111                     printf ("\033[0;31mERROR1 %d %d %#x\033[0m\n", w, slice->h, err);
1112                     abort ();
1113                 }
1114             }
1115             glTexSubImage2D (GL_TEXTURE_RECTANGLE_ARB,
1116                              0,
1117                              0,
1118                              0,
1119                              w,
1120                              slice->h,
1121                              state.texform,
1122                              state.texty,
1123                              page->pixmap->samples + offset
1124                 );
1125             {
1126                 GLenum err = glGetError ();
1127                 if (err != GL_NO_ERROR) {
1128                     printf ("\033[0;31mERROR %d %d %#x\033[0m\n", w, slice->h, err);
1129                     abort ();
1130                 }
1131             }
1132         }
1133         else {
1134             glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
1135                           0,
1136                           GL_RGBA8,
1137                           w,
1138                           slice->h,
1139                           0,
1140                           state.texform,
1141                           state.texty,
1142                           page->pixmap->samples + offset
1143                 );
1144         }
1145
1146         end = now ();
1147         lprintf ("%s[%d] slice=%d(%d,%d) texid=%d %f sec\n",
1148                  subimage ? "sub" : "img",
1149                  page->pageno, slicenum,
1150                  slice->w, slice->h,
1151                  state.texids[slice->texindex],
1152                  end - start);
1153     }
1154 }
1155
1156 CAMLprim value ml_draw (value dispy_v, value w_v, value h_v,
1157                         value py_v, value ptr_v)
1158 {
1159     CAMLparam5 (dispy_v, w_v, h_v, py_v, ptr_v);
1160     int dispy = Int_val (dispy_v);
1161     int w = Int_val (w_v);
1162     int h = Int_val (h_v);
1163     int py = Int_val (py_v);
1164     char *s = String_val (ptr_v);
1165     int ret;
1166     void *ptr;
1167     struct page *page;
1168     int slicenum = 0;
1169
1170     ret = sscanf (s, "%p", &ptr);
1171     if (ret != 1) {
1172         errx (1, "cannot parse pointer `%s'", s);
1173     }
1174     page = ptr;
1175
1176     w = page->pixmap->w;
1177
1178     ARSERT (h >= 0 && "ml_draw wrong h");
1179     ARSERT (py <= page->pixmap->h && "ml_draw wrong py");
1180
1181     glEnable (GL_TEXTURE_RECTANGLE_ARB);
1182
1183     for (slicenum = 0; slicenum < page->slicecount; ++slicenum) {
1184         struct slice *slice = &page->slices[slicenum];
1185         if (slice->h > py) {
1186             break;
1187         }
1188         py -= slice->h;
1189     }
1190
1191     h = MIN (state.h, h);
1192     while (h) {
1193         int th;
1194         struct slice *slice = &page->slices[slicenum];
1195
1196         ARSERT (slicenum < page->slicecount && "ml_draw wrong slicenum");
1197
1198         th = MIN (h, slice->h - py);
1199         upload2 (page, slicenum, "upload");
1200
1201         glBegin (GL_QUADS);
1202         {
1203             glTexCoord2i (0, py);
1204             glVertex2i (0, dispy);
1205
1206             glTexCoord2i (w, py);
1207             glVertex2i (w, dispy);
1208
1209             glTexCoord2i (w, py+th);
1210             glVertex2i (w, dispy + th);
1211
1212             glTexCoord2i (0, py+th);
1213             glVertex2i (0, dispy + th);
1214         }
1215         glEnd ();
1216
1217         h -= th;
1218         py = 0;
1219         dispy += th;
1220         slicenum += 1;
1221     }
1222
1223     showsel (page, Int_val (dispy_v) - Int_val (py_v));
1224     glDisable (GL_TEXTURE_RECTANGLE_ARB);
1225
1226     CAMLreturn (Val_unit);
1227 }
1228
1229 static pdf_link *getlink (struct page *page, int x, int y)
1230 {
1231     fz_point p;
1232     fz_matrix ctm;
1233     pdf_link *link;
1234
1235     p.x = x + page->pixmap->x;
1236     p.y = y + page->pixmap->y;
1237
1238     ctm = fz_invertmatrix (page->pagedim.ctm);
1239     p = fz_transformpoint (ctm, p);
1240
1241     for (link = page->drawpage->links; link; link = link->next) {
1242         if (p.x >= link->rect.x0 && p.x <= link->rect.x1) {
1243             if (p.y >= link->rect.y0 && p.y <= link->rect.y1) {
1244                 return link;
1245             }
1246         }
1247     }
1248     return NULL;
1249 }
1250
1251 CAMLprim value ml_highlightlinks (value ptr_v, value yoff_v)
1252 {
1253     CAMLparam2 (ptr_v, yoff_v);
1254     pdf_link *link;
1255     struct page *page;
1256     int xoff, yoff = Int_val (yoff_v);
1257     const char *s = String_val (ptr_v);
1258
1259     if (trylock ("ml_highlightlinks")) {
1260         goto done;
1261     }
1262
1263     page = parse_pointer ("ml_highlightlinks", s);
1264
1265     glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
1266     glEnable (GL_LINE_STIPPLE);
1267     glLineStipple (0.5, 0xcccc);
1268
1269     xoff = -page->pixmap->x;
1270     yoff -= page->pixmap->y;
1271
1272     glBegin (GL_QUADS);
1273     for (link = page->drawpage->links; link; link = link->next) {
1274         fz_point p1, p2, p3, p4;
1275         fz_matrix ctm = page->pagedim.ctm;
1276
1277         p1.x = link->rect.x0;
1278         p1.y = link->rect.y0;
1279
1280         p2.x = link->rect.x1;
1281         p2.y = link->rect.y0;
1282
1283         p3.x = link->rect.x1;
1284         p3.y = link->rect.y1;
1285
1286         p4.x = link->rect.x0;
1287         p4.y = link->rect.y1;
1288
1289         p1 = fz_transformpoint (ctm, p1);
1290         p2 = fz_transformpoint (ctm, p2);
1291         p3 = fz_transformpoint (ctm, p3);
1292         p4 = fz_transformpoint (ctm, p4);
1293
1294         switch (link->kind) {
1295         case PDF_LGOTO: glColor3ub (255, 0, 0); break;
1296         case PDF_LURI: glColor3ub (0, 0, 255); break;
1297         default: glColor3ub (0, 0, 0); break;
1298         }
1299
1300         glVertex2f (p1.x + xoff, p1.y + yoff);
1301         glVertex2f (p2.x + xoff, p2.y + yoff);
1302         glVertex2f (p3.x + xoff, p3.y + yoff);
1303         glVertex2f (p4.x + xoff, p4.y + yoff);
1304     }
1305     glEnd ();
1306
1307     glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1308     glDisable (GL_LINE_STIPPLE);
1309     unlock ("ml_highlightlinks");
1310
1311  done:
1312     CAMLreturn (Val_unit);
1313 }
1314
1315 static void ensuretext (struct page *page)
1316 {
1317     if (!page->text) {
1318         fz_error error;
1319         fz_device *tdev;
1320
1321         page->text = fz_newtextspan ();
1322         tdev = fz_newtextdevice (page->text);
1323         error = pdf_runpage (state.xref, page->drawpage, tdev,
1324                              page->pagedim.ctm);
1325         if (error) die (error);
1326         fz_freedevice (tdev);
1327     }
1328 }
1329
1330 CAMLprim value ml_whatsunder (value ptr_v, value x_v, value y_v)
1331 {
1332     CAMLparam3 (ptr_v, x_v, y_v);
1333     CAMLlocal3 (ret_v, tup_v, str_v);
1334     pdf_link *link;
1335     struct page *page;
1336     char *s = String_val (ptr_v);
1337
1338     ret_v = Val_int (0);
1339     if (trylock ("ml_whatsunder")) {
1340         goto done;
1341     }
1342
1343     page = parse_pointer ("ml_whatsunder", s);
1344     link = getlink (page, Int_val (x_v), Int_val (y_v));
1345     if (link) {
1346         switch (link->kind) {
1347         case PDF_LGOTO:
1348             {
1349                 int pageno;
1350                 fz_point p;
1351                 fz_obj *obj;
1352
1353                 pageno = -1;
1354                 p.x = 0;
1355                 p.y = 0;
1356
1357                 if (fz_isarray (link->dest)) {
1358                     obj = fz_arrayget (link->dest, 0);
1359                     if (fz_isindirect (obj)) {
1360                         pageno = pdf_findpageobject (state.xref, obj) - 1;
1361                     }
1362                     else if (fz_isint (obj)) {
1363                         pageno = fz_toint (obj);
1364                     }
1365
1366                     if (fz_arraylen (link->dest) > 3) {
1367                         fz_obj *xo, *yo;
1368
1369                         xo = fz_arrayget (link->dest, 2);
1370                         yo = fz_arrayget (link->dest, 3);
1371                         if (!fz_isnull (xo) && !fz_isnull (yo)) {
1372                             p.x = fz_toint (xo);
1373                             p.y = fz_toint (yo);
1374                             p = fz_transformpoint (page->pagedim.ctm, p);
1375                         }
1376                     }
1377                 }
1378                 else {
1379                     pageno = pdf_findpageobject (state.xref, link->dest) - 1;
1380                 }
1381                 tup_v = caml_alloc_tuple (2);
1382                 ret_v = caml_alloc_small (1, 1);
1383                 Field (tup_v, 0) = Val_int (pageno);
1384                 Field (tup_v, 1) = Val_int (p.y);
1385                 Field (ret_v, 0) = tup_v;
1386             }
1387             break;
1388
1389         case PDF_LURI:
1390             str_v = caml_copy_string (fz_tostrbuf (link->dest));
1391             ret_v = caml_alloc_small (1, 0);
1392             Field (ret_v, 0) = str_v;
1393             break;
1394
1395         default:
1396             printd (state.sock, "T unhandled link kind %d", link->kind);
1397             break;
1398         }
1399     }
1400     else {
1401         int i, x, y;
1402         fz_textspan *span;
1403
1404         ensuretext (page);
1405         x = Int_val (x_v) + page->pixmap->x;
1406         y = Int_val (y_v) + page->pixmap->y;
1407
1408         for (span = page->text; span; span = span->next) {
1409             for (i = 0; i < span->len; ++i) {
1410                 fz_bbox *b;
1411                 b = &span->text[i].bbox;
1412                 if ((x >= b->x0 && x <= b->x1 && y >= b->y0 && y <= b->y1)) {
1413 #ifdef FT_FREETYPE_H
1414                     FT_FaceRec *face = span->font->ftface;
1415                     if (face) {
1416                         char *s;
1417                         char *n1 = face->family_name;
1418                         char *n2 = span->font->name;
1419                         size_t l1 = strlen (n1);
1420                         size_t l2 = strlen (n2);
1421
1422                         if (l1 != l2 || memcmp (n1, n2, l1)) {
1423                             s = malloc (l1 + l2 + 2);
1424                             if (s) {
1425                                 memcpy (s, n2, l2);
1426                                 s[l2] = '=';
1427                                 memcpy (s + l2 + 1, n1, l1 + 1);
1428                                 str_v = caml_copy_string (s);
1429                                 free (s);
1430                             }
1431                         }
1432                     }
1433                     if (str_v == 0) {
1434                         str_v = caml_copy_string (span->font->name);
1435                     }
1436 #else
1437                     str_v = caml_copy_string (span->font->name);
1438 #endif
1439                     ret_v = caml_alloc_small (1, 2);
1440                     Field (ret_v, 0) = str_v;
1441                     goto unlock;
1442                 }
1443             }
1444         }
1445     }
1446  unlock:
1447     unlock ("ml_whatsunder");
1448
1449  done:
1450     CAMLreturn (ret_v);
1451 }
1452
1453 CAMLprim value ml_seltext (value ptr_v, value rect_v, value oy_v)
1454 {
1455     CAMLparam4 (ptr_v, rect_v, oy_v, rect_v);
1456     fz_bbox *b;
1457     struct page *page;
1458     fz_textspan *span;
1459     struct mark first, last;
1460     int i, x0, x1, y0, y1, oy;
1461     char *s = String_val (ptr_v);
1462
1463     if (trylock ("ml_seltext")) {
1464         goto done;
1465     }
1466
1467     page = parse_pointer ("ml_seltext", s);
1468     ensuretext (page);
1469
1470     oy = Int_val (oy_v);
1471     x0 = Int_val (Field (rect_v, 0));
1472     y0 = Int_val (Field (rect_v, 1));
1473     x1 = Int_val (Field (rect_v, 2));
1474     y1 = Int_val (Field (rect_v, 3));
1475
1476     if (0) {
1477         glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
1478         glColor3ub (128, 128, 128);
1479         glRecti (x0, y0, x1, y1);
1480         glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
1481     }
1482
1483     x0 += page->pixmap->x;
1484     y0 += page->pixmap->y - oy;
1485     x1 += page->pixmap->x;
1486     y1 += page->pixmap->y - oy;
1487
1488     first.span = NULL;
1489     last.span = NULL;
1490
1491     last.i = first.i = 0;
1492     first.span = page->text;
1493     for (span = page->text; span; span = span->next) {
1494         for (i = 0; i < span->len; ++i) {
1495             b = &span->text[i].bbox;
1496             if (x0 >= b->x0 && x0 <= b->x1 && y0 >= b->y0 && y0 <= b->y1) {
1497                 first.i = i;
1498                 first.span = span;
1499             }
1500             if (x1 >= b->x0 && x1 <= b->x1 && y1 >= b->y0 && y1 <= b->y1) {
1501                 last.i = i;
1502                 last.span = span;
1503             }
1504         }
1505     }
1506
1507     if (y1 < y0 || x1 < x0) {
1508         int swap = 0;
1509
1510         if (first.span == last.span)  {
1511             swap = 1;
1512         }
1513         else {
1514             if (y1 < y0) {
1515                 for (span = first.span; span && span != last.span;
1516                      span = span->next) {
1517                     if (span->eol) {
1518                         swap = 1;
1519                         break;
1520                     }
1521                 }
1522             }
1523         }
1524
1525         if (swap) {
1526             i = first.i;
1527             span = first.span;
1528             first.i = last.i;
1529             first.span = last.span;
1530             last.i = i;
1531             last.span = span;
1532         }
1533     }
1534
1535     page->fmark = first;
1536     page->lmark = last;
1537
1538     unlock ("ml_seltext");
1539
1540  done:
1541     CAMLreturn (Val_unit);
1542 }
1543
1544 static int pipespan (FILE *f, fz_textspan *span, int a, int b)
1545 {
1546     char buf[4];
1547     int i, len, ret;
1548
1549     for (i = a; i <= b; ++i) {
1550         len = runetochar (buf, &span->text[i].c);
1551         ret = fwrite (buf, len, 1, f);
1552
1553         if (ret != 1) {
1554             printd (state.sock, "T failed to write %d bytes ret=%d: %s",
1555                     len, ret, strerror (errno));
1556             return -1;
1557         }
1558     }
1559     return 0;
1560 }
1561
1562 CAMLprim value ml_copysel (value ptr_v)
1563 {
1564     CAMLparam1 (ptr_v);
1565     FILE *f;
1566     struct page *page;
1567     char *s = String_val (ptr_v);
1568
1569     if (trylock ("ml_copysel")) {
1570         goto done;
1571     }
1572
1573     if (!*s)  {
1574     close:
1575 #ifdef USE_XSEL
1576         if (state.xselpipe) {
1577             int ret = pclose (state.xselpipe);
1578             if (ret)  {
1579                 printd (state.sock, "T failed to close xsel pipe `%s'",
1580                         strerror (errno));
1581             }
1582             state.xselpipe = NULL;
1583         }
1584 #else
1585         printf ("========================================\n");
1586 #endif
1587     }
1588     else {
1589         fz_textspan *span;
1590
1591         page = parse_pointer ("ml_sopysel", s);
1592
1593         if (!page->fmark.span || !page->lmark.span) {
1594             printd (state.sock, "T nothing to copy");
1595             goto unlock;
1596         }
1597
1598         f = stdout;
1599 #ifdef USE_XSEL
1600         if (!state.xselpipe) {
1601             state.xselpipe = popen ("xsel -i", "w");
1602             if (!state.xselpipe) {
1603                 printd (state.sock, "T failed to open xsel pipe `%s'",
1604                         strerror (errno));
1605             }
1606             else {
1607                 f = state.xselpipe;
1608             }
1609         }
1610         else  {
1611             f = state.xselpipe;
1612         }
1613 #endif
1614
1615         for (span = page->fmark.span;
1616              span && span != page->lmark.span->next;
1617              span = span->next) {
1618             int a = span == page->fmark.span ? page->fmark.i : 0;
1619             int b = span == page->lmark.span ? page->lmark.i : span->len - 1;
1620             if (pipespan (f, span, a, b))  {
1621                 goto close;
1622             }
1623             if (span->eol)  {
1624                 if (putc ('\n', f) == EOF) {
1625                     printd (state.sock, "T failed break line on xsel pipe `%s'",
1626                             strerror (errno));
1627                     goto close;
1628                 }
1629             }
1630         }
1631         page->lmark.span = NULL;
1632         page->fmark.span = NULL;
1633     }
1634
1635  unlock:
1636     unlock ("ml_copysel");
1637
1638  done:
1639     CAMLreturn (Val_unit);
1640 }
1641
1642 CAMLprim value ml_getpagewh (value pagedimno_v)
1643 {
1644     CAMLparam1 (pagedimno_v);
1645     CAMLlocal1 (ret_v);
1646     int pagedimno = Int_val (pagedimno_v);
1647
1648     ret_v = caml_alloc_small (4 * Double_wosize, Double_array_tag);
1649     Store_double_field (ret_v, 0, state.pagedims[pagedimno].box.x0);
1650     Store_double_field (ret_v, 1, state.pagedims[pagedimno].box.x1);
1651     Store_double_field (ret_v, 2, state.pagedims[pagedimno].box.y0);
1652     Store_double_field (ret_v, 3, state.pagedims[pagedimno].box.y1);
1653     CAMLreturn (ret_v);
1654 }
1655
1656 CAMLprim value ml_init (value sock_v)
1657 {
1658 #ifndef _WIN32
1659     int ret;
1660 #endif
1661     CAMLparam1 (sock_v);
1662
1663     state.texcount = 256;
1664     state.sliceheight = 24;
1665     state.texform = GL_RGBA;
1666     state.texty = GL_UNSIGNED_BYTE;
1667
1668     fz_accelerate ();
1669     state.texids = calloc (state.texcount * sizeof (*state.texids), 1);
1670     if (!state.texids) {
1671         err (1, "calloc texids " FMT_s,
1672              state.texcount * sizeof (*state.texids));
1673     }
1674
1675     state.texowners = calloc (state.texcount * sizeof (*state.texowners), 1);
1676     if (!state.texowners) {
1677         err (1, "calloc texowners " FMT_s,
1678              state.texcount * sizeof (*state.texowners));
1679     }
1680
1681     glGenTextures (state.texcount, state.texids);
1682
1683 #ifdef _WIN32
1684     state.sock = Socket_val (sock_v);
1685 #else
1686     state.sock = Int_val (sock_v);
1687 #endif
1688
1689     state.cache = fz_newglyphcache ();
1690     if (!state.cache) {
1691         errx (1, "fz_newglyphcache failed");
1692     }
1693
1694 #ifdef _WIN32
1695     InitializeCriticalSection (&critsec);
1696     state.thread = CreateThread (NULL, 0, mainloop, NULL, 0, NULL);
1697     if (state.thread == INVALID_HANDLE_VALUE) {
1698         errx (1, "CreateThread failed: %lx", GetLastError ());
1699     }
1700 #else
1701     ret = pthread_create (&state.thread, NULL, mainloop, NULL);
1702     if (ret) {
1703         errx (1, "pthread_create: %s", strerror (errno));
1704     }
1705 #endif
1706
1707     CAMLreturn (Val_unit);
1708 }