backend/djvu/djvu-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Nickolay V. Shmyrev <nshmyrev@yandex.ru>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <config.h>
  23 #include "djvu-document.h"
  24 #include "djvu-text.h"
  25 #include "djvu-links.h"
  26 #include "djvu-document-private.h"
  27 #include "ev-document-thumbnails.h"
  28 #include "ev-file-exporter.h"
  29 #include "ev-document-misc.h"
  30 #include "ev-document-find.h"
  31 #include "ev-document-links.h"
  32 #include "ev-selection.h"
  33 #include "ev-file-helpers.h"
  34
  35 #include <gdk-pixbuf/gdk-pixbuf-core.h>
  36 #include <glib/gi18n.h>
  37 #include <glib/gunicode.h>
  38 #include <string.h>
  39
  40 #define SCALE_FACTOR 0.2
  41
  42 enum {
  43         PROP_0,
  44         PROP_TITLE
  45 };
  46
  47 struct _DjvuDocumentClass
  48 {
  49         GObjectClass parent_class;
  50 };
  51
  52 typedef struct _DjvuDocumentClass DjvuDocumentClass;
  53
  54 static void djvu_document_document_iface_init (EvDocumentIface *iface);
  55 static void djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  56 static void djvu_document_file_exporter_iface_init (EvFileExporterIface *iface);
  57 static void djvu_document_find_iface_init (EvDocumentFindIface *iface);
  58 static void djvu_document_document_links_iface_init  (EvDocumentLinksIface *iface);
  59 static void djvu_selection_iface_init (EvSelectionIface *iface);
  60
  61 EV_BACKEND_REGISTER_WITH_CODE (DjvuDocument, djvu_document,
  62     {
  63       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, djvu_document_document_thumbnails_iface_init);
  64       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_FILE_EXPORTER, djvu_document_file_exporter_iface_init);
  65       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_FIND, djvu_document_find_iface_init);
  66       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_LINKS, djvu_document_document_links_iface_init);
  67       EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_SELECTION, djvu_selection_iface_init);
  68      });
  69
  70
  71 void
  72 djvu_handle_events (DjvuDocument *djvu_document, int wait)
  73 {
  74         ddjvu_context_t *ctx = djvu_document->d_context;
  75         const ddjvu_message_t *msg;
  76
  77         if (!ctx)
  78                 return;
  79
  80         if (wait)
  81                 msg = ddjvu_message_wait (ctx);
  82
  83         while ((msg = ddjvu_message_peek (ctx))) {
  84                 switch (msg->m_any.tag) {
  85                         case DDJVU_ERROR:
  86                                 g_warning ("DjvuLibre error: %s",
  87                                            msg->m_error.message);
  88                                 if (msg->m_error.filename)
  89                                         g_warning ("DjvuLibre error: %s:%d",
  90                                                    msg->m_error.filename,
  91                                                    msg->m_error.lineno);
  92                                 break;
  93                         default:
  94                                 break;
  95                 }
  96                 ddjvu_message_pop (ctx);
  97         }
  98 }
  99
 100 static gboolean
 101 djvu_document_load (EvDocument  *document,
 102                     const char  *uri,
 103                     GError     **error)
 104 {
 105         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 106         ddjvu_document_t *doc;
 107         gchar *filename;
 108         gboolean missing_files = FALSE;
 109
 110         /* FIXME: We could actually load uris  */
 111         filename = g_filename_from_uri (uri, NULL, error);
 112         if (!filename)
 113                 return FALSE;
 114
 115         doc = ddjvu_document_create_by_filename (djvu_document->d_context, filename, TRUE);
 116
 117         if (!doc) {
 118                 g_free (filename);
 119                 return FALSE;
 120         }
 121
 122         if (djvu_document->d_document)
 123             ddjvu_document_release (djvu_document->d_document);
 124
 125         djvu_document->d_document = doc;
 126
 127         while (!ddjvu_document_decoding_done (djvu_document->d_document))
 128                 djvu_handle_events (djvu_document, TRUE);
 129         g_free (djvu_document->uri);
 130         djvu_document->uri = g_strdup (uri);
 131
 132         if (ddjvu_document_get_type (djvu_document->d_document) == DDJVU_DOCTYPE_INDIRECT) {
 133                 gint n_files;
 134                 gint i;
 135                 gchar *base;
 136
 137                 base = g_path_get_dirname (filename);
 138
 139                 n_files = ddjvu_document_get_filenum (djvu_document->d_document);
 140                 for (i = 0; i < n_files; i++) {
 141                         struct ddjvu_fileinfo_s fileinfo;
 142                         gchar *file;
 143
 144                         ddjvu_document_get_fileinfo (djvu_document->d_document,
 145                                                      i, &fileinfo);
 146
 147                         if (fileinfo.type != 'P')
 148                                 continue;
 149
 150                         file = g_build_filename (base, fileinfo.id, NULL);
 151                         if (!g_file_test (file, G_FILE_TEST_EXISTS)) {
 152                                 missing_files = TRUE;
 153                                 g_free (file);
 154
 155                                 break;
 156                         }
 157                         g_free (file);
 158                 }
 159                 g_free (base);
 160         }
 161         g_free (filename);
 162
 163         if (missing_files) {
 164                 g_set_error (error,
 165                              G_FILE_ERROR,
 166                              G_FILE_ERROR_EXIST,
 167                              _("The document is composed by several files. "
 168                                "One or more of such files cannot be accessed."));
 169
 170                 return FALSE;
 171         }
 172
 173         return TRUE;
 174 }
 175
 176
 177 static gboolean
 178 djvu_document_save (EvDocument  *document,
 179                     const char  *uri,
 180                     GError     **error)
 181 {
 182         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 183
 184         return ev_xfer_uri_simple (djvu_document->uri, uri, error);
 185 }
 186
 187 int
 188 djvu_document_get_n_pages (EvDocument  *document)
 189 {
 190         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 191
 192         g_return_val_if_fail (djvu_document->d_document, 0);
 193
 194         return ddjvu_document_get_pagenum (djvu_document->d_document);
 195 }
 196
 197 static void
 198 djvu_document_get_page_size (EvDocument   *document,
 199                              int           page,
 200                              double       *width,
 201                              double       *height)
 202 {
 203         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 204         ddjvu_pageinfo_t info;
 205         ddjvu_status_t r;
 206
 207         g_return_if_fail (djvu_document->d_document);
 208
 209         while ((r = ddjvu_document_get_pageinfo(djvu_document->d_document, page, &info)) < DDJVU_JOB_OK)
 210                 djvu_handle_events(djvu_document, TRUE);
 211
 212         if (r >= DDJVU_JOB_FAILED)
 213                 djvu_handle_events(djvu_document, TRUE);
 214
 215         *width = info.width * SCALE_FACTOR;
 216         *height = info.height * SCALE_FACTOR;
 217 }
 218
 219 static cairo_surface_t *
 220 djvu_document_render (EvDocument      *document,
 221                       EvRenderContext *rc)
 222 {
 223         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 224         cairo_surface_t *surface;
 225         gchar *pixels;
 226         gint   rowstride;
 227         ddjvu_rect_t rrect;
 228         ddjvu_rect_t prect;
 229         ddjvu_page_t *d_page;
 230         ddjvu_page_rotation_t rotation;
 231         double page_width, page_height, tmp;
 232         static const cairo_user_data_key_t key;
 233
 234         d_page = ddjvu_page_create_by_pageno (djvu_document->d_document, rc->page);
 235
 236         while (!ddjvu_page_decoding_done (d_page))
 237                 djvu_handle_events(djvu_document, TRUE);
 238
 239         page_width = ddjvu_page_get_width (d_page) * rc->scale * SCALE_FACTOR + 0.5;
 240         page_height = ddjvu_page_get_height (d_page) * rc->scale * SCALE_FACTOR + 0.5;
 241
 242         switch (rc->rotation) {
 243                 case 90:
 244                         rotation = DDJVU_ROTATE_90;
 245                         tmp = page_height;
 246                         page_height = page_width;
 247                         page_width = tmp;
 248
 249                         break;
 250                 case 180:
 251                         rotation = DDJVU_ROTATE_180;
 252
 253                         break;
 254                 case 270:
 255                         rotation = DDJVU_ROTATE_270;
 256                         tmp = page_height;
 257                         page_height = page_width;
 258                         page_width = tmp;
 259
 260                         break;
 261                 default:
 262                         rotation = DDJVU_ROTATE_0;
 263         }
 264 #ifdef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
 265         rowstride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, page_width);
 266 #else
 267         rowstride = page_width * 4;
 268 #endif
 269         pixels = (gchar *) g_malloc (page_height * rowstride);
 270         surface = cairo_image_surface_create_for_data ((guchar *)pixels,
 271                                                        CAIRO_FORMAT_RGB24,
 272                                                        page_width,
 273                                                        page_height,
 274                                                        rowstride);
 275         cairo_surface_set_user_data (surface, &key,
 276                                      pixels, (cairo_destroy_func_t)g_free);
 277         prect.x = 0;
 278         prect.y = 0;
 279         prect.w = page_width;
 280         prect.h = page_height;
 281         rrect = prect;
 282
 283         ddjvu_page_set_rotation (d_page, rotation);
 284
 285         ddjvu_page_render (d_page, DDJVU_RENDER_COLOR,
 286                            &prect,
 287                            &rrect,
 288                            djvu_document->d_format,
 289                            rowstride,
 290                            pixels);
 291
 292         return surface;
 293 }
 294
 295 static void
 296 djvu_document_finalize (GObject *object)
 297 {
 298         DjvuDocument *djvu_document = DJVU_DOCUMENT (object);
 299
 300         if (djvu_document->search)
 301             djvu_text_free (djvu_document->search);
 302
 303         if (djvu_document->d_document)
 304             ddjvu_document_release (djvu_document->d_document);
 305
 306         if (djvu_document->opts)
 307             g_string_free (djvu_document->opts, TRUE);
 308
 309         if (djvu_document->ps_filename)
 310             g_free (djvu_document->ps_filename);
 311
 312         ddjvu_context_release (djvu_document->d_context);
 313         ddjvu_format_release (djvu_document->d_format);
 314         ddjvu_format_release (djvu_document->thumbs_format);
 315         g_free (djvu_document->uri);
 316
 317         G_OBJECT_CLASS (djvu_document_parent_class)->finalize (object);
 318 }
 319
 320 static void
 321 djvu_document_class_init (DjvuDocumentClass *klass)
 322 {
 323         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 324
 325         gobject_class->finalize = djvu_document_finalize;
 326 }
 327
 328 static EvDocumentInfo *
 329 djvu_document_get_info (EvDocument *document)
 330 {
 331         EvDocumentInfo *info;
 332
 333         info = g_new0 (EvDocumentInfo, 1);
 334
 335         return info;
 336 }
 337
 338 static void
 339 djvu_document_document_iface_init (EvDocumentIface *iface)
 340 {
 341         iface->load = djvu_document_load;
 342         iface->save = djvu_document_save;
 343         iface->get_n_pages = djvu_document_get_n_pages;
 344         iface->get_page_size = djvu_document_get_page_size;
 345         iface->render = djvu_document_render;
 346         iface->get_info = djvu_document_get_info;
 347 }
 348
 349 static gchar *
 350 djvu_selection_get_selected_text (EvSelection     *selection,
 351                                   EvRenderContext *rc,
 352                                   EvSelectionStyle style,
 353                                   EvRectangle     *points)
 354 {
 355         DjvuDocument *djvu_document = DJVU_DOCUMENT (selection);
 356         double width, height;
 357         EvRectangle rectangle;
 358         gchar *text;
 359
 360         djvu_document_get_page_size (EV_DOCUMENT (djvu_document),
 361                                      rc->page, &width, &height);
 362         rectangle.x1 = points->x1 / SCALE_FACTOR;
 363         rectangle.y1 = (height - points->y2) / SCALE_FACTOR;
 364         rectangle.x2 = points->x2 / SCALE_FACTOR;
 365         rectangle.y2 = (height - points->y1) / SCALE_FACTOR;
 366
 367         text = djvu_text_copy (djvu_document, rc->page, &rectangle);
 368
 369         if (text == NULL)
 370                 text = g_strdup ("");
 371
 372         return text;
 373 }
 374
 375 static void
 376 djvu_selection_iface_init (EvSelectionIface *iface)
 377 {
 378         iface->get_selected_text = djvu_selection_get_selected_text;
 379 }
 380
 381 static void
 382 djvu_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 383                                          EvRenderContext      *rc,
 384                                          gint                 *width,
 385                                          gint                 *height)
 386 {
 387         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 388         gdouble page_width, page_height;
 389
 390         djvu_document_get_page_size (EV_DOCUMENT(djvu_document), rc->page,
 391                                      &page_width, &page_height);
 392
 393         if (rc->rotation == 90 || rc->rotation == 270) {
 394                 *width = (gint) (page_height * rc->scale);
 395                 *height = (gint) (page_width * rc->scale);
 396         } else {
 397                 *width = (gint) (page_width * rc->scale);
 398                 *height = (gint) (page_height * rc->scale);
 399         }
 400 }
 401
 402 static GdkPixbuf *
 403 djvu_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 404                                         EvRenderContext      *rc,
 405                                         gboolean              border)
 406 {
 407         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 408         GdkPixbuf *pixbuf, *rotated_pixbuf;
 409         gdouble page_width, page_height;
 410         gint thumb_width, thumb_height;
 411         guchar *pixels;
 412
 413         g_return_val_if_fail (djvu_document->d_document, NULL);
 414
 415         djvu_document_get_page_size (EV_DOCUMENT(djvu_document), rc->page,
 416                                      &page_width, &page_height);
 417
 418         thumb_width = (gint) (page_width * rc->scale);
 419         thumb_height = (gint) (page_height * rc->scale);
 420
 421         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8,
 422                                  thumb_width, thumb_height);
 423         gdk_pixbuf_fill (pixbuf, 0xffffffff);
 424         pixels = gdk_pixbuf_get_pixels (pixbuf);
 425
 426         while (ddjvu_thumbnail_status (djvu_document->d_document, rc->page, 1) < DDJVU_JOB_OK)
 427                 djvu_handle_events(djvu_document, TRUE);
 428
 429         ddjvu_thumbnail_render (djvu_document->d_document, rc->page,
 430                                 &thumb_width, &thumb_height,
 431                                 djvu_document->thumbs_format,
 432                                 gdk_pixbuf_get_rowstride (pixbuf),
 433                                 (gchar *)pixels);
 434
 435         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 436         g_object_unref (pixbuf);
 437
 438         if (border) {
 439               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 440
 441               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 442               g_object_unref (tmp_pixbuf);
 443         }
 444
 445         return rotated_pixbuf;
 446 }
 447
 448 static void
 449 djvu_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 450 {
 451         iface->get_thumbnail = djvu_document_thumbnails_get_thumbnail;
 452         iface->get_dimensions = djvu_document_thumbnails_get_dimensions;
 453 }
 454
 455 /* EvFileExporterIface */
 456 static void
 457 djvu_document_file_exporter_begin (EvFileExporter        *exporter,
 458                                    EvFileExporterContext *fc)
 459 {
 460         DjvuDocument *djvu_document = DJVU_DOCUMENT (exporter);
 461
 462         if (djvu_document->ps_filename)
 463                 g_free (djvu_document->ps_filename);
 464         djvu_document->ps_filename = g_strdup (fc->filename);
 465
 466         g_string_assign (djvu_document->opts, "-page=");
 467 }
 468
 469 static void
 470 djvu_document_file_exporter_do_page (EvFileExporter  *exporter,
 471                                      EvRenderContext *rc)
 472 {
 473         DjvuDocument *djvu_document = DJVU_DOCUMENT (exporter);
 474
 475         g_string_append_printf (djvu_document->opts, "%d,", (rc->page) + 1);
 476 }
 477
 478 static void
 479 djvu_document_file_exporter_end (EvFileExporter *exporter)
 480 {
 481         int d_optc = 1;
 482         const char *d_optv[d_optc];
 483
 484         DjvuDocument *djvu_document = DJVU_DOCUMENT (exporter);
 485
 486         FILE *fn = fopen (djvu_document->ps_filename, "w");
 487         if (fn == NULL) {
 488                 g_warning ("Cannot open file “%s”.", djvu_document->ps_filename);
 489                 return;
 490         }
 491
 492         d_optv[0] = djvu_document->opts->str;
 493
 494         ddjvu_job_t * job = ddjvu_document_print(djvu_document->d_document, fn, d_optc, d_optv);
 495         while (!ddjvu_job_done(job)) {
 496                 djvu_handle_events (djvu_document, TRUE);
 497         }
 498
 499         fclose(fn);
 500 }
 501
 502 static EvFileExporterCapabilities
 503 djvu_document_file_exporter_get_capabilities (EvFileExporter *exporter)
 504 {
 505         return  EV_FILE_EXPORTER_CAN_PAGE_SET |
 506                 EV_FILE_EXPORTER_CAN_COPIES |
 507                 EV_FILE_EXPORTER_CAN_COLLATE |
 508                 EV_FILE_EXPORTER_CAN_REVERSE |
 509                 EV_FILE_EXPORTER_CAN_GENERATE_PS;
 510 }
 511
 512 static void
 513 djvu_document_file_exporter_iface_init (EvFileExporterIface *iface)
 514 {
 515         iface->begin = djvu_document_file_exporter_begin;
 516         iface->do_page = djvu_document_file_exporter_do_page;
 517         iface->end = djvu_document_file_exporter_end;
 518         iface->get_capabilities = djvu_document_file_exporter_get_capabilities;
 519 }
 520
 521 static void
 522 djvu_document_init (DjvuDocument *djvu_document)
 523 {
 524         guint masks[4] = { 0xff0000, 0xff00, 0xff, 0xff000000 };
 525
 526         djvu_document->d_context = ddjvu_context_create ("Evince");
 527         djvu_document->d_format = ddjvu_format_create (DDJVU_FORMAT_RGBMASK32, 4, masks);
 528         ddjvu_format_set_row_order (djvu_document->d_format, 1);
 529
 530         djvu_document->thumbs_format = ddjvu_format_create (DDJVU_FORMAT_RGB24, 0, 0);
 531         ddjvu_format_set_row_order (djvu_document->thumbs_format, 1);
 532
 533         djvu_document->ps_filename = NULL;
 534         djvu_document->opts = g_string_new ("");
 535
 536         djvu_document->d_document = NULL;
 537 }
 538
 539 static void
 540 djvu_document_find_begin (EvDocumentFind   *document,
 541                           int               page,
 542                           const char       *search_string,
 543                           gboolean          case_sensitive)
 544 {
 545         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 546
 547         if (djvu_document->search &&
 548             strcmp (search_string, djvu_text_get_text (djvu_document->search)) == 0)
 549                 return;
 550
 551         if (djvu_document->search)
 552                 djvu_text_free (djvu_document->search);
 553
 554         djvu_document->search = djvu_text_new (djvu_document,
 555                                                           page,
 556                                                           case_sensitive,
 557                                                           search_string);
 558 }
 559
 560 static int
 561 djvu_document_find_get_n_results (EvDocumentFind *document_find, int page)
 562 {
 563         DjvuText *search = DJVU_DOCUMENT (document_find)->search;
 564
 565         if (search) {
 566                 return djvu_text_n_results (search, page);
 567         } else {
 568                 return 0;
 569         }
 570 }
 571
 572 static gboolean
 573 djvu_document_find_get_result (EvDocumentFind *document_find,
 574                                int             page,
 575                                int             n_result,
 576                                EvRectangle    *rectangle)
 577 {
 578         DjvuDocument *djvu_document = DJVU_DOCUMENT (document_find);
 579         DjvuText *search = djvu_document->search;
 580         EvRectangle *r;
 581         double width, height;
 582
 583         if (search == NULL)
 584                 return FALSE;
 585
 586         r = djvu_text_get_result (search, page, n_result);
 587         if (r == NULL)
 588                 return FALSE;
 589
 590         djvu_document_get_page_size (EV_DOCUMENT (djvu_document),
 591                 page, &width, &height);
 592         rectangle->x1 = r->x1 * SCALE_FACTOR;
 593         rectangle->y1 = height - r->y2 * SCALE_FACTOR;
 594         rectangle->x2 = r->x2 * SCALE_FACTOR;
 595         rectangle->y2 = height - r->y1 * SCALE_FACTOR;
 596
 597         return TRUE;
 598 }
 599
 600 static int
 601 djvu_document_find_page_has_results (EvDocumentFind *document_find,
 602                                     int             page)
 603 {
 604         DjvuText *search = DJVU_DOCUMENT (document_find)->search;
 605
 606         return search && djvu_text_has_results (search, page);
 607 }
 608
 609 static double
 610 djvu_document_find_get_progress (EvDocumentFind *document_find)
 611 {
 612         DjvuText *search = DJVU_DOCUMENT (document_find)->search;
 613
 614         if (search == NULL) {
 615                 return 0;
 616         }
 617
 618         return djvu_text_get_progress (search);
 619 }
 620
 621 static void
 622 djvu_document_find_cancel (EvDocumentFind *document)
 623 {
 624         DjvuDocument *djvu_document = DJVU_DOCUMENT (document);
 625
 626         if (djvu_document->search) {
 627                 djvu_text_free (djvu_document->search);
 628                 djvu_document->search = NULL;
 629         }
 630 }
 631
 632 static void
 633 djvu_document_find_iface_init (EvDocumentFindIface *iface)
 634 {
 635         iface->begin = djvu_document_find_begin;
 636         iface->get_n_results = djvu_document_find_get_n_results;
 637         iface->get_result = djvu_document_find_get_result;
 638         iface->page_has_results = djvu_document_find_page_has_results;
 639         iface->get_progress = djvu_document_find_get_progress;
 640         iface->cancel = djvu_document_find_cancel;
 641 }
 642
 643 static GList *
 644 djvu_document_links_get_links (EvDocumentLinks *document_links,
 645                                gint             page)
 646 {
 647         return djvu_links_get_links (document_links, page, SCALE_FACTOR);
 648 }
 649
 650 static void
 651 djvu_document_document_links_iface_init  (EvDocumentLinksIface *iface)
 652 {
 653         iface->has_document_links = djvu_links_has_document_links;
 654         iface->get_links_model = djvu_links_get_links_model;
 655         iface->get_links = djvu_document_links_get_links;
 656         iface->find_link_dest = djvu_links_find_link_dest;
 657 }