shell/ev-page-cache.c

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