shell/ev-page-cache.c

   1 #include <config.h>
   2 #include "ev-page-cache.h"
   3 #include "ev-document-thumbnails.h"
   4 #include "ev-page.h"
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #define THUMBNAIL_WIDTH 100
   9
  10 typedef struct _EvPageCacheInfo
  11 {
  12         double width;
  13         double height;
  14 } EvPageCacheInfo;
  15
  16 typedef struct _EvPageThumbsInfo
  17 {
  18         gint width;
  19         gint height;
  20 } EvPageThumbsInfo;
  21
  22 struct _EvPageCache
  23 {
  24         GObject parent;
  25
  26         gint current_page;
  27         int n_pages;
  28         char *title;
  29         char **page_labels;
  30
  31         gint max_label_chars;
  32         gboolean has_labels;
  33         gboolean uniform;
  34         gboolean dual_even_left;
  35
  36         double uniform_width;
  37         double uniform_height;
  38
  39         double  max_width;
  40         double  max_height;
  41
  42         double* height_to_page;
  43         double* dual_height_to_page;
  44
  45         int rotation;
  46
  47         EvPageCacheInfo *size_cache;
  48         EvDocumentInfo *page_info;
  49
  50         /* Thumbnail dimensions */
  51         gboolean thumbs_uniform;
  52         gint thumbs_uniform_width;
  53         gint thumbs_uniform_height;
  54         gint thumbs_max_width;
  55         gint thumbs_max_height;
  56         EvPageThumbsInfo *thumbs_size_cache;
  57 };
  58
  59 struct _EvPageCacheClass
  60 {
  61         GObjectClass parent_class;
  62
  63         void (* page_changed) (EvPageCache *page_cache, gint page);
  64         void (* history_changed) (EvPageCache *page_cache, gint page);
  65 };
  66
  67 enum
  68 {
  69         PAGE_CHANGED,
  70         HISTORY_CHANGED,
  71         N_SIGNALS,
  72 };
  73
  74 static guint signals[N_SIGNALS] = {0, };
  75
  76 static void ev_page_cache_init       (EvPageCache      *page_cache);
  77 static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
  78 static void ev_page_cache_finalize   (GObject *object);
  79
  80 G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
  81
  82 static void
  83 ev_page_cache_init (EvPageCache *page_cache)
  84 {
  85         page_cache->current_page = -1;
  86         page_cache->max_label_chars = 0;
  87 }
  88
  89 static void
  90 ev_page_cache_class_init (EvPageCacheClass *class)
  91 {
  92         GObjectClass *object_class;
  93
  94         object_class = G_OBJECT_CLASS (class);
  95
  96         object_class->finalize = ev_page_cache_finalize;
  97
  98         signals [PAGE_CHANGED] =
  99                 g_signal_new ("page-changed",
 100                               EV_TYPE_PAGE_CACHE,
 101                               G_SIGNAL_RUN_LAST,
 102                               G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
 103                               NULL, NULL,
 104                               g_cclosure_marshal_VOID__INT,
 105                               G_TYPE_NONE, 1,
 106                               G_TYPE_INT);
 107
 108         signals [HISTORY_CHANGED] =
 109                 g_signal_new ("history-changed",
 110                               EV_TYPE_PAGE_CACHE,
 111                               G_SIGNAL_RUN_LAST,
 112                               G_STRUCT_OFFSET (EvPageCacheClass, history_changed),
 113                               NULL, NULL,
 114                               g_cclosure_marshal_VOID__INT,
 115                               G_TYPE_NONE, 1,
 116                               G_TYPE_INT);
 117
 118 }
 119
 120 static void
 121 ev_page_cache_finalize (GObject *object)
 122 {
 123         EvPageCache *page_cache;
 124
 125         page_cache = EV_PAGE_CACHE (object);
 126
 127         if (page_cache->title) {
 128                 g_free (page_cache->title);
 129                 page_cache->title = NULL;
 130         }
 131
 132         if (page_cache->size_cache) {
 133                 g_free (page_cache->size_cache);
 134                 page_cache->size_cache = NULL;
 135         }
 136
 137         if (page_cache->height_to_page) {
 138                 g_free (page_cache->height_to_page);
 139                 page_cache->height_to_page = NULL;
 140         }
 141
 142         if (page_cache->dual_height_to_page) {
 143                 g_free (page_cache->dual_height_to_page);
 144                 page_cache->dual_height_to_page = NULL;
 145         }
 146
 147         if (page_cache->page_labels) {
 148                 gint i;
 149
 150                 for (i = 0; i < page_cache->n_pages; i++) {
 151                         if (page_cache->page_labels[i])
 152                                 g_free (page_cache->page_labels[i]);
 153                 }
 154                 g_free (page_cache->page_labels);
 155                 page_cache->page_labels = NULL;
 156         }
 157
 158         if (page_cache->page_info) {
 159                 ev_document_info_free (page_cache->page_info);
 160                 page_cache->page_info = NULL;
 161         }
 162
 163         G_OBJECT_CLASS (ev_page_cache_parent_class)->finalize (object);
 164 }
 165
 166 static void
 167 build_height_to_page (EvPageCache *page_cache)
 168 {
 169         gboolean swap;
 170         int i;
 171         double uniform_height, page_height, next_page_height;
 172         double saved_height;
 173
 174         swap = (page_cache->rotation == 90 ||
 175                 page_cache->rotation == 270);
 176
 177         g_free (page_cache->height_to_page);
 178         g_free (page_cache->dual_height_to_page);
 179
 180         page_cache->height_to_page = g_new0(double, page_cache->n_pages + 1);
 181         page_cache->dual_height_to_page = g_new0(double, page_cache->n_pages + 2);
 182
 183         saved_height = 0;
 184         for (i = 0; i <= page_cache->n_pages; i++) {
 185                 if (page_cache->uniform) {
 186                         if (!swap) {
 187                                 uniform_height = page_cache->uniform_height;
 188                         } else {
 189                                 uniform_height = page_cache->uniform_width;
 190                         }
 191                         page_cache->height_to_page [i] = i * uniform_height;
 192                 } else {
 193                         if (i < page_cache->n_pages) {
 194                                 if (!swap) {
 195                                         page_height = page_cache->size_cache [i].height;
 196                                 } else {
 197                                         page_height = page_cache->size_cache [i].width;
 198                                 }
 199                         } else {
 200                                 page_height = 0;
 201                         }
 202                         page_cache->height_to_page [i] = saved_height;
 203                         saved_height += page_height;
 204                 }
 205         }
 206
 207         if (page_cache->dual_even_left && !page_cache->uniform) {
 208                 if (!swap) {
 209                         saved_height = page_cache->size_cache [0].height;
 210                 } else {
 211                         saved_height = page_cache->size_cache [0].width;
 212                 }
 213         } else {
 214                 saved_height = 0;
 215         }
 216         for (i = page_cache->dual_even_left; i < page_cache->n_pages + 2; i += 2) {
 217                 if (page_cache->uniform) {
 218                         if (!swap) {
 219                                 uniform_height = page_cache->uniform_height;
 220                         } else {
 221                                 uniform_height = page_cache->uniform_width;
 222                         }
 223                         page_cache->dual_height_to_page [i] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 224                         if (i + 1 < page_cache->n_pages + 2)
 225                                 page_cache->dual_height_to_page [i + 1] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 226                 } else {
 227                         if (i + 1 < page_cache->n_pages) {
 228                                 if (!swap) {
 229                                         next_page_height = page_cache->size_cache [i + 1].height;
 230                                 } else {
 231                                         next_page_height = page_cache->size_cache [i + 1].width;
 232                                 }
 233                         } else {
 234                                 next_page_height = 0;
 235                         }
 236                         if (i < page_cache->n_pages) {
 237                                 if (!swap) {
 238                                         page_height = page_cache->size_cache [i].height;
 239                                 } else {
 240                                         page_height = page_cache->size_cache [i].width;
 241                                 }
 242                         } else {
 243                                 page_height = 0;
 244                         }
 245                         if (i + 1 < page_cache->n_pages + 2) {
 246                                 page_cache->dual_height_to_page [i] = saved_height;
 247                                 page_cache->dual_height_to_page [i + 1] = saved_height;
 248                                 saved_height += MAX(page_height, next_page_height);
 249                         } else {
 250                                 page_cache->dual_height_to_page [i] = saved_height;
 251                         }
 252                 }
 253         }
 254 }
 255
 256 EvPageCache *
 257 ev_page_cache_new (EvDocument *document)
 258 {
 259         EvPageCache *page_cache;
 260         EvPageCacheInfo *info;
 261         EvPageThumbsInfo *thumb_info;
 262         EvRenderContext *rc = NULL;
 263         gboolean has_thumbs;
 264         gint i;
 265
 266         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 267
 268         ev_document_doc_mutex_lock ();
 269
 270         /* We read page information out of the document */
 271
 272         /* Assume all pages are the same size until proven otherwise */
 273         page_cache->uniform = TRUE;
 274         page_cache->has_labels = FALSE;
 275         page_cache->n_pages = ev_document_get_n_pages (document);
 276         page_cache->dual_even_left = (page_cache->n_pages > 2);
 277         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 278         page_cache->max_width = 0;
 279         page_cache->max_height = 0;
 280         page_cache->page_info = ev_document_get_info (document);
 281         page_cache->thumbs_uniform = TRUE;
 282
 283         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 284                 page_cache->title = g_strdup (page_cache->page_info->title);
 285         } else {
 286                 page_cache->title = NULL;
 287         }
 288
 289         has_thumbs = EV_IS_DOCUMENT_THUMBNAILS (document);
 290
 291         for (i = 0; i < page_cache->n_pages; i++) {
 292                 EvPage *page;
 293                 double  page_width = 0;
 294                 double  page_height = 0;
 295                 gint    thumb_width = 0;
 296                 gint    thumb_height = 0;
 297
 298                 page = ev_document_get_page (document, i);
 299
 300                 ev_document_get_page_size (document, page, &page_width, &page_height);
 301
 302                 page_cache->page_labels[i] = ev_document_get_page_label (document, page);
 303
 304                 if (page_cache->page_labels[i] != NULL) {
 305
 306                         page_cache->max_label_chars = MAX (page_cache->max_label_chars,
 307                                                            g_utf8_strlen (page_cache->page_labels[i], 256));
 308                         if (!page_cache->has_labels) {
 309                                 gchar *expected_label;
 310
 311                                 expected_label = g_strdup_printf ("%d", i + 1);
 312                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 313                                         page_cache->has_labels = TRUE;
 314                                 g_free (expected_label);
 315                         }
 316                 }
 317
 318                 if (page_width > page_cache->max_width) {
 319                         page_cache->max_width = page_width;
 320                 }
 321
 322                 if (page_height > page_cache->max_height) {
 323                         page_cache->max_height = page_height;
 324                 }
 325
 326                 if (i == 0) {
 327                         page_cache->uniform_width = page_width;
 328                         page_cache->uniform_height = page_height;
 329                 } else if (page_cache->uniform &&
 330                            (page_cache->uniform_width != page_width ||
 331                             page_cache->uniform_height != page_height)) {
 332                         /* It's a different page size.  Backfill the array. */
 333                         int j;
 334
 335                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 336
 337                         for (j = 0; j < i; j++) {
 338                                 info = &(page_cache->size_cache [j]);
 339                                 info->width = page_cache->uniform_width;
 340                                 info->height = page_cache->uniform_height;
 341                         }
 342                         page_cache->uniform = FALSE;
 343
 344                 }
 345
 346                 if (! page_cache->uniform) {
 347                         info = &(page_cache->size_cache [i]);
 348
 349                         info->width = page_width;
 350                         info->height = page_height;
 351                 }
 352
 353                 if (!has_thumbs) {
 354                         g_object_unref (page);
 355                         continue;
 356                 }
 357
 358                 if (!rc) {
 359                         rc = ev_render_context_new (page, 0, (gdouble)THUMBNAIL_WIDTH / page_width);
 360                 } else {
 361                         ev_render_context_set_page (rc, page);
 362                         ev_render_context_set_scale (rc, (gdouble)THUMBNAIL_WIDTH / page_width);
 363                 }
 364
 365                 ev_document_thumbnails_get_dimensions (EV_DOCUMENT_THUMBNAILS (document),
 366                                                        rc, &thumb_width, &thumb_height);
 367
 368                 if (thumb_width > page_cache->thumbs_max_width) {
 369                         page_cache->thumbs_max_width = thumb_width;
 370                 }
 371
 372                 if (thumb_height > page_cache->thumbs_max_height) {
 373                         page_cache->thumbs_max_height = thumb_height;
 374                 }
 375
 376                 if (i == 0) {
 377                         page_cache->thumbs_uniform_width = thumb_width;
 378                         page_cache->thumbs_uniform_height = thumb_height;
 379                 } else if (page_cache->thumbs_uniform &&
 380                            (page_cache->thumbs_uniform_width != thumb_width ||
 381                             page_cache->thumbs_uniform_height != thumb_height)) {
 382                         /* It's a different thumbnail size.  Backfill the array. */
 383                         int j;
 384
 385                         page_cache->thumbs_size_cache = g_new0 (EvPageThumbsInfo, page_cache->n_pages);
 386
 387                         for (j = 0; j < i; j++) {
 388                                 thumb_info = &(page_cache->thumbs_size_cache [j]);
 389                                 thumb_info->width = page_cache->thumbs_uniform_width;
 390                                 thumb_info->height = page_cache->thumbs_uniform_height;
 391                         }
 392                         page_cache->thumbs_uniform = FALSE;
 393                 }
 394
 395                 if (! page_cache->thumbs_uniform) {
 396                         thumb_info = &(page_cache->thumbs_size_cache [i]);
 397
 398                         thumb_info->width = thumb_width;
 399                         thumb_info->height = thumb_height;
 400                 }
 401
 402                 g_object_unref (page);
 403         }
 404
 405         if (rc) {
 406                 g_object_unref (rc);
 407         }
 408
 409         build_height_to_page (page_cache);
 410
 411         /* make some sanity check assertions */
 412         if (! page_cache->uniform)
 413                 g_assert (page_cache->size_cache != NULL);
 414         if (page_cache->uniform && page_cache->n_pages > 0)
 415                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 416
 417         ev_document_doc_mutex_unlock ();
 418
 419         if (page_cache->n_pages > 0)
 420                 ev_page_cache_set_current_page (page_cache, 0);
 421
 422         return page_cache;
 423 }
 424
 425 gint
 426 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 427 {
 428         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 429
 430         return page_cache->n_pages;
 431 }
 432
 433 gint
 434 ev_page_cache_get_current_page (EvPageCache *page_cache)
 435 {
 436         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 437
 438         return page_cache->current_page;
 439 }
 440
 441 void
 442 ev_page_cache_set_current_page (EvPageCache *page_cache,
 443                                 int          page)
 444 {
 445         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 446         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 447
 448         if (page == page_cache->current_page)
 449                 return;
 450
 451         page_cache->current_page = page;
 452         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 453 }
 454
 455 void
 456 ev_page_cache_set_current_page_history (EvPageCache *page_cache,
 457                                         int          page)
 458 {
 459         if (abs (page - page_cache->current_page) > 1)
 460                 g_signal_emit (page_cache, signals [HISTORY_CHANGED], 0, page);
 461
 462         ev_page_cache_set_current_page (page_cache, page);
 463 }
 464
 465 gboolean
 466 ev_page_cache_set_page_label (EvPageCache *page_cache,
 467                               const char  *page_label)
 468 {
 469         gint i, page;
 470         long value;
 471         char *endptr = NULL;
 472
 473         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 474         g_return_val_if_fail (page_label != NULL, FALSE);
 475
 476         /* First, look for a literal label match */
 477         for (i = 0; i < page_cache->n_pages; i ++) {
 478                 if (page_cache->page_labels[i] != NULL &&
 479                     ! strcmp (page_label, page_cache->page_labels[i])) {
 480                         ev_page_cache_set_current_page (page_cache, i);
 481                         return TRUE;
 482                 }
 483         }
 484
 485         /* Second, look for a match with case insensitively */
 486         for (i = 0; i < page_cache->n_pages; i++) {
 487                 if (page_cache->page_labels[i] != NULL &&
 488                     ! strcasecmp (page_label, page_cache->page_labels[i])) {
 489                         ev_page_cache_set_current_page (page_cache, i);
 490                         return TRUE;
 491                 }
 492         }
 493
 494         /* Next, parse the label, and see if the number fits */
 495         value = strtol (page_label, &endptr, 10);
 496         if (endptr[0] == '\0') {
 497                 /* Page number is an integer */
 498                 page = MIN (G_MAXINT, value);
 499
 500                 /* convert from a page label to a page offset */
 501                 page --;
 502                 if (page >= 0 &&
 503                     page < page_cache->n_pages) {
 504                         ev_page_cache_set_current_page (page_cache, page);
 505                         return TRUE;
 506                 }
 507         }
 508
 509         return FALSE;
 510 }
 511
 512 const char *
 513 ev_page_cache_get_title (EvPageCache *page_cache)
 514 {
 515         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 516
 517         return page_cache->title;
 518 }
 519
 520 void
 521 ev_page_cache_get_size (EvPageCache  *page_cache,
 522                         gint          page,
 523                         gint          rotation,
 524                         gfloat        scale,
 525                         gint         *width,
 526                         gint         *height)
 527 {
 528         double w, h;
 529
 530         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 531         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 532
 533         if (page_cache->uniform) {
 534                 w = page_cache->uniform_width;
 535                 h = page_cache->uniform_height;
 536         } else {
 537                 EvPageCacheInfo *info;
 538
 539                 info = &(page_cache->size_cache [page]);
 540
 541                 w = info->width;
 542                 h = info->height;
 543         }
 544
 545         w = w * scale + 0.5;
 546         h = h * scale + 0.5;
 547
 548         if (rotation == 0 || rotation == 180) {
 549                 if (width) *width = (int)w;
 550                 if (height) *height = (int)h;
 551         } else {
 552                 if (width) *width = (int)h;
 553                 if (height) *height = (int)w;
 554         }
 555 }
 556
 557 void
 558 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 559                              gint           rotation,
 560                              gfloat         scale,
 561                              gint          *width)
 562 {
 563         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 564
 565         if (width) {
 566                 if (rotation == 0 || rotation == 180) {
 567                         *width = page_cache->max_width * scale;
 568                 } else {
 569                         *width = page_cache->max_height * scale;
 570                 }
 571         }
 572 }
 573
 574 void
 575 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 576                               gint           rotation,
 577                               gfloat         scale,
 578                               gint          *height)
 579 {
 580         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 581
 582         if (height) {
 583                 if (rotation == 0 || rotation == 180) {
 584                         *height = page_cache->max_height * scale;
 585                 } else {
 586                         *height = page_cache->max_width * scale;
 587                 }
 588         }
 589 }
 590
 591 void
 592 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 593                                   gint           page,
 594                                   gint           rotation,
 595                                   gfloat         scale,
 596                                   gint          *height,
 597                                   gint          *dual_height)
 598 {
 599         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 600         g_return_if_fail (page >= 0);
 601         g_return_if_fail (!height || page <= page_cache->n_pages);
 602         g_return_if_fail (!dual_height || page <= page_cache->n_pages + 1);
 603
 604         if (page_cache->rotation != rotation) {
 605                 page_cache->rotation = rotation;
 606                 build_height_to_page (page_cache);
 607         }
 608
 609         if (height)
 610                 *height = page_cache->height_to_page [page] * scale;
 611
 612         if (dual_height)
 613                 *dual_height = page_cache->dual_height_to_page [page] * scale;
 614 }
 615
 616 void
 617 ev_page_cache_get_thumbnail_size (EvPageCache  *page_cache,
 618                                   gint          page,
 619                                   gint          rotation,
 620                                   gint         *width,
 621                                   gint         *height)
 622 {
 623         gint w, h;
 624
 625         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 626         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 627
 628         if (page_cache->thumbs_uniform) {
 629                 w = page_cache->thumbs_uniform_width;
 630                 h = page_cache->thumbs_uniform_height;
 631         } else {
 632                 EvPageThumbsInfo *info;
 633
 634                 info = &(page_cache->thumbs_size_cache [page]);
 635
 636                 w = info->width;
 637                 h = info->height;
 638         }
 639
 640         if (rotation == 0 || rotation == 180) {
 641                 if (width) *width = w;
 642                 if (height) *height = h;
 643         } else {
 644                 if (width) *width = h;
 645                 if (height) *height = w;
 646         }
 647 }
 648
 649 gint
 650 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 651 {
 652         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 653
 654         return page_cache->max_label_chars;
 655 }
 656
 657 gboolean
 658 ev_page_cache_get_dual_even_left (EvPageCache *page_cache)
 659 {
 660         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 661
 662         return page_cache->dual_even_left;
 663 }
 664
 665 gchar *
 666 ev_page_cache_get_page_label (EvPageCache *page_cache,
 667                               gint         page)
 668 {
 669         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 670         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 671
 672         if (page_cache->page_labels[page] == NULL)
 673                 return g_strdup_printf ("%d", page + 1);
 674
 675         return g_strdup (page_cache->page_labels[page]);
 676 }
 677
 678 gboolean
 679 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 680 {
 681         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 682         return page_cache->has_labels;
 683 }
 684
 685 const EvDocumentInfo *
 686 ev_page_cache_get_info (EvPageCache *page_cache)
 687 {
 688         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 689
 690         return page_cache->page_info;
 691 }
 692
 693 #define PAGE_CACHE_STRING "ev-page-cache"
 694
 695 EvPageCache *
 696 ev_page_cache_get (EvDocument *document)
 697 {
 698         EvPageCache *page_cache;
 699
 700         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 701
 702         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 703         if (page_cache == NULL) {
 704                 page_cache = ev_page_cache_new (document);
 705                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 706         }
 707
 708         return page_cache;
 709 }