shell/ev-page-cache.c

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