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 <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                 double page_width = 0;
 293                 double page_height = 0;
 294                 gint   thumb_width = 0;
 295                 gint   thumb_height = 0;
 296
 297                 ev_document_get_page_size (document, i, &page_width, &page_height);
 298
 299                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 300
 301                 if (page_cache->page_labels[i] != NULL) {
 302
 303                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 304                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 305                         if (!page_cache->has_labels) {
 306                                 gchar *expected_label;
 307
 308                                 expected_label = g_strdup_printf ("%d", i + 1);
 309                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 310                                         page_cache->has_labels = TRUE;
 311                                 g_free (expected_label);
 312                         }
 313                 }
 314
 315                 if (page_width > page_cache->max_width) {
 316                         page_cache->max_width = page_width;
 317                 }
 318
 319                 if (page_height > page_cache->max_height) {
 320                         page_cache->max_height = page_height;
 321                 }
 322
 323                 if (i == 0) {
 324                         page_cache->uniform_width = page_width;
 325                         page_cache->uniform_height = page_height;
 326                 } else if (page_cache->uniform &&
 327                            (page_cache->uniform_width != page_width ||
 328                             page_cache->uniform_height != page_height)) {
 329                         /* It's a different page size.  Backfill the array. */
 330                         int j;
 331
 332                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 333
 334                         for (j = 0; j < i; j++) {
 335                                 info = &(page_cache->size_cache [j]);
 336                                 info->width = page_cache->uniform_width;
 337                                 info->height = page_cache->uniform_height;
 338                         }
 339                         page_cache->uniform = FALSE;
 340
 341                 }
 342
 343                 if (! page_cache->uniform) {
 344                         info = &(page_cache->size_cache [i]);
 345
 346                         info->width = page_width;
 347                         info->height = page_height;
 348                 }
 349
 350                 if (!has_thumbs)
 351                         continue;
 352
 353                 if (!rc) {
 354                         rc = ev_render_context_new (0, i, (gdouble)THUMBNAIL_WIDTH / page_width);
 355                 } else {
 356                         ev_render_context_set_page (rc, i);
 357                         ev_render_context_set_scale (rc, (gdouble)THUMBNAIL_WIDTH / page_width);
 358                 }
 359
 360                 ev_document_thumbnails_get_dimensions (EV_DOCUMENT_THUMBNAILS (document),
 361                                                        rc, &thumb_width, &thumb_height);
 362
 363                 if (thumb_width > page_cache->thumbs_max_width) {
 364                         page_cache->thumbs_max_width = thumb_width;
 365                 }
 366
 367                 if (thumb_height > page_cache->thumbs_max_height) {
 368                         page_cache->thumbs_max_height = thumb_height;
 369                 }
 370
 371                 if (i == 0) {
 372                         page_cache->thumbs_uniform_width = thumb_width;
 373                         page_cache->thumbs_uniform_height = thumb_height;
 374                 } else if (page_cache->thumbs_uniform &&
 375                            (page_cache->thumbs_uniform_width != thumb_width ||
 376                             page_cache->thumbs_uniform_height != thumb_height)) {
 377                         /* It's a different thumbnail size.  Backfill the array. */
 378                         int j;
 379
 380                         page_cache->thumbs_size_cache = g_new0 (EvPageThumbsInfo, page_cache->n_pages);
 381
 382                         for (j = 0; j < i; j++) {
 383                                 thumb_info = &(page_cache->thumbs_size_cache [j]);
 384                                 thumb_info->width = page_cache->thumbs_uniform_width;
 385                                 thumb_info->height = page_cache->thumbs_uniform_height;
 386                         }
 387                         page_cache->thumbs_uniform = FALSE;
 388                 }
 389
 390                 if (! page_cache->thumbs_uniform) {
 391                         thumb_info = &(page_cache->thumbs_size_cache [i]);
 392
 393                         thumb_info->width = thumb_width;
 394                         thumb_info->height = thumb_height;
 395                 }
 396         }
 397
 398         if (rc) {
 399                 g_object_unref (rc);
 400         }
 401
 402         build_height_to_page (page_cache);
 403
 404         /* make some sanity check assertions */
 405         if (! page_cache->uniform)
 406                 g_assert (page_cache->size_cache != NULL);
 407         if (page_cache->uniform && page_cache->n_pages > 0)
 408                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 409
 410         ev_document_doc_mutex_unlock ();
 411
 412         if (page_cache->n_pages > 0)
 413                 ev_page_cache_set_current_page (page_cache, 0);
 414
 415         return page_cache;
 416 }
 417
 418 gint
 419 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 420 {
 421         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 422
 423         return page_cache->n_pages;
 424 }
 425
 426 gint
 427 ev_page_cache_get_current_page (EvPageCache *page_cache)
 428 {
 429         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 430
 431         return page_cache->current_page;
 432 }
 433
 434 void
 435 ev_page_cache_set_current_page (EvPageCache *page_cache,
 436                                 int          page)
 437 {
 438         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 439         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 440
 441         if (page == page_cache->current_page)
 442                 return;
 443
 444         page_cache->current_page = page;
 445         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 446 }
 447
 448 void
 449 ev_page_cache_set_current_page_history (EvPageCache *page_cache,
 450                                         int          page)
 451 {
 452         if (abs (page - page_cache->current_page) > 1)
 453                 g_signal_emit (page_cache, signals [HISTORY_CHANGED], 0, page);
 454
 455         ev_page_cache_set_current_page (page_cache, page);
 456 }
 457
 458 gboolean
 459 ev_page_cache_set_page_label (EvPageCache *page_cache,
 460                               const char  *page_label)
 461 {
 462         gint i, page;
 463         long value;
 464         char *endptr = NULL;
 465
 466         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 467         g_return_val_if_fail (page_label != NULL, FALSE);
 468
 469         /* First, look for a literal label match */
 470         for (i = 0; i < page_cache->n_pages; i ++) {
 471                 if (page_cache->page_labels[i] != NULL &&
 472                     ! strcmp (page_label, page_cache->page_labels[i])) {
 473                         ev_page_cache_set_current_page (page_cache, i);
 474                         return TRUE;
 475                 }
 476         }
 477
 478         /* Next, parse the label, and see if the number fits */
 479         value = strtol (page_label, &endptr, 10);
 480         if (endptr[0] == '\0') {
 481                 /* Page number is an integer */
 482                 page = MIN (G_MAXINT, value);
 483
 484                 /* convert from a page label to a page offset */
 485                 page --;
 486                 if (page >= 0 &&
 487                     page < page_cache->n_pages) {
 488                         ev_page_cache_set_current_page (page_cache, page);
 489                         return TRUE;
 490                 }
 491         }
 492
 493         return FALSE;
 494 }
 495
 496 const char *
 497 ev_page_cache_get_title (EvPageCache *page_cache)
 498 {
 499         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 500
 501         return page_cache->title;
 502 }
 503
 504 void
 505 ev_page_cache_get_size (EvPageCache  *page_cache,
 506                         gint          page,
 507                         gint          rotation,
 508                         gfloat        scale,
 509                         gint         *width,
 510                         gint         *height)
 511 {
 512         double w, h;
 513
 514         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 515         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 516
 517         if (page_cache->uniform) {
 518                 w = page_cache->uniform_width;
 519                 h = page_cache->uniform_height;
 520         } else {
 521                 EvPageCacheInfo *info;
 522
 523                 info = &(page_cache->size_cache [page]);
 524
 525                 w = info->width;
 526                 h = info->height;
 527         }
 528
 529         w = w * scale + 0.5;
 530         h = h * scale + 0.5;
 531
 532         if (rotation == 0 || rotation == 180) {
 533                 if (width) *width = (int)w;
 534                 if (height) *height = (int)h;
 535         } else {
 536                 if (width) *width = (int)h;
 537                 if (height) *height = (int)w;
 538         }
 539 }
 540
 541 void
 542 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 543                              gint           rotation,
 544                              gfloat         scale,
 545                              gint          *width)
 546 {
 547         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 548
 549         if (width) {
 550                 if (rotation == 0 || rotation == 180) {
 551                         *width = page_cache->max_width * scale;
 552                 } else {
 553                         *width = page_cache->max_height * scale;
 554                 }
 555         }
 556 }
 557
 558 void
 559 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 560                               gint           rotation,
 561                               gfloat         scale,
 562                               gint          *height)
 563 {
 564         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 565
 566         if (height) {
 567                 if (rotation == 0 || rotation == 180) {
 568                         *height = page_cache->max_height * scale;
 569                 } else {
 570                         *height = page_cache->max_width * scale;
 571                 }
 572         }
 573 }
 574
 575 void
 576 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 577                                   gint           page,
 578                                   gint           rotation,
 579                                   gfloat         scale,
 580                                   gint          *height,
 581                                   gint          *dual_height)
 582 {
 583         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 584         g_return_if_fail (page >= 0);
 585         g_return_if_fail (!height || page <= page_cache->n_pages);
 586         g_return_if_fail (!dual_height || page <= page_cache->n_pages + 1);
 587
 588         if (page_cache->rotation != rotation) {
 589                 page_cache->rotation = rotation;
 590                 build_height_to_page (page_cache);
 591         }
 592
 593         if (height)
 594                 *height = page_cache->height_to_page [page] * scale;
 595
 596         if (dual_height)
 597                 *dual_height = page_cache->dual_height_to_page [page] * scale;
 598 }
 599
 600 void
 601 ev_page_cache_get_thumbnail_size (EvPageCache  *page_cache,
 602                                   gint          page,
 603                                   gint          rotation,
 604                                   gint         *width,
 605                                   gint         *height)
 606 {
 607         gint w, h;
 608
 609         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 610         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 611
 612         if (page_cache->thumbs_uniform) {
 613                 w = page_cache->thumbs_uniform_width;
 614                 h = page_cache->thumbs_uniform_height;
 615         } else {
 616                 EvPageThumbsInfo *info;
 617
 618                 info = &(page_cache->thumbs_size_cache [page]);
 619
 620                 w = info->width;
 621                 h = info->height;
 622         }
 623
 624         if (rotation == 0 || rotation == 180) {
 625                 if (width) *width = w;
 626                 if (height) *height = h;
 627         } else {
 628                 if (width) *width = h;
 629                 if (height) *height = w;
 630         }
 631 }
 632
 633 gint
 634 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 635 {
 636         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 637
 638         return page_cache->max_label_chars;
 639 }
 640
 641 gboolean
 642 ev_page_cache_get_dual_even_left (EvPageCache *page_cache)
 643 {
 644         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 645
 646         return page_cache->dual_even_left;
 647 }
 648
 649 gchar *
 650 ev_page_cache_get_page_label (EvPageCache *page_cache,
 651                               gint         page)
 652 {
 653         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 654         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 655
 656         if (page_cache->page_labels[page] == NULL)
 657                 return g_strdup_printf ("%d", page + 1);
 658
 659         return g_strdup (page_cache->page_labels[page]);
 660 }
 661
 662 gboolean
 663 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 664 {
 665         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 666         return page_cache->has_labels;
 667 }
 668
 669 const EvDocumentInfo *
 670 ev_page_cache_get_info (EvPageCache *page_cache)
 671 {
 672         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 673
 674         return page_cache->page_info;
 675 }
 676
 677 #define PAGE_CACHE_STRING "ev-page-cache"
 678
 679 EvPageCache *
 680 ev_page_cache_get (EvDocument *document)
 681 {
 682         EvPageCache *page_cache;
 683
 684         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 685
 686         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 687         if (page_cache == NULL) {
 688                 page_cache = ev_page_cache_new (document);
 689                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 690         }
 691
 692         return page_cache;
 693 }