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 (!swap) {
 178                                 page_height = page_cache->size_cache [i].height;
 179                         } else {
 180                                 page_height = page_cache->size_cache [i].width;
 181                         }
 182                         page_cache->height_to_page [i] = saved_height;
 183                         saved_height += page_height;
 184                 }
 185         }
 186
 187         if (page_cache->dual_even_left && !page_cache->uniform) {
 188                 if (!swap) {
 189                         saved_height = page_cache->size_cache [0].height;
 190                 } else {
 191                         saved_height = page_cache->size_cache [0].width;
 192                 }
 193         } else {
 194                 saved_height = 0;
 195         }
 196         for (i = page_cache->dual_even_left; i < page_cache->n_pages + 2; i += 2) {
 197                 if (page_cache->uniform) {
 198                         if (!swap) {
 199                                 uniform_height = page_cache->uniform_height;
 200                         } else {
 201                                 uniform_height = page_cache->uniform_width;
 202                         }
 203                         page_cache->dual_height_to_page [i] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 204                         if (i + 1 < page_cache->n_pages + 2)
 205                                 page_cache->dual_height_to_page [i + 1] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 206                 } else {
 207                         if (i + 1 < page_cache->n_pages) {
 208                                 if (!swap) {
 209                                         next_page_height = page_cache->size_cache [i + 1].height;
 210                                 } else {
 211                                         next_page_height = page_cache->size_cache [i + 1].width;
 212                                 }
 213                         } else {
 214                                 next_page_height = 0;
 215                         }
 216                         if (i < page_cache->n_pages) {
 217                                 if (!swap) {
 218                                         page_height = page_cache->size_cache [i].height;
 219                                 } else {
 220                                         page_height = page_cache->size_cache [i].width;
 221                                 }
 222                         } else {
 223                                 page_height = 0;
 224                         }
 225                         if (i + 1 < page_cache->n_pages + 2) {
 226                                 page_cache->dual_height_to_page [i] = saved_height;
 227                                 page_cache->dual_height_to_page [i + 1] = saved_height;
 228                                 saved_height += MAX(page_height, next_page_height);
 229                         } else {
 230                                 page_cache->dual_height_to_page [i] = saved_height;
 231                         }
 232                 }
 233         }
 234 }
 235
 236 EvPageCache *
 237 ev_page_cache_new (EvDocument *document)
 238 {
 239         EvPageCache *page_cache;
 240         EvPageCacheInfo *info;
 241         gint i;
 242
 243         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 244
 245         ev_document_doc_mutex_lock ();
 246
 247         /* We read page information out of the document */
 248
 249         /* Assume all pages are the same size until proven otherwise */
 250         page_cache->uniform = TRUE;
 251         page_cache->has_labels = FALSE;
 252         page_cache->n_pages = ev_document_get_n_pages (document);
 253         page_cache->dual_even_left = (page_cache->n_pages > 2);
 254         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 255         page_cache->max_width = 0;
 256         page_cache->max_height = 0;
 257         page_cache->page_info = ev_document_get_info (document);
 258
 259         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 260                 page_cache->title = g_strdup (page_cache->page_info->title);
 261         } else {
 262                 page_cache->title = NULL;
 263         }
 264
 265         for (i = 0; i < page_cache->n_pages; i++) {
 266                 double page_width = 0;
 267                 double page_height = 0;
 268
 269                 ev_document_get_page_size (document, i, &page_width, &page_height);
 270
 271                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 272
 273                 if (page_cache->page_labels[i] != NULL) {
 274
 275                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 276                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 277                         if (!page_cache->has_labels) {
 278                                 gchar *expected_label;
 279
 280                                 expected_label = g_strdup_printf ("%d", i + 1);
 281                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 282                                         page_cache->has_labels = TRUE;
 283                                 g_free (expected_label);
 284                         }
 285                 }
 286
 287                 if (page_width > page_cache->max_width) {
 288                         page_cache->max_width = page_width;
 289                 }
 290
 291                 if (page_height > page_cache->max_height) {
 292                         page_cache->max_height = page_height;
 293                 }
 294
 295                 if (i == 0) {
 296                         page_cache->uniform_width = page_width;
 297                         page_cache->uniform_height = page_height;
 298                 } else if (page_cache->uniform &&
 299                            (page_cache->uniform_width != page_width ||
 300                             page_cache->uniform_height != page_height)) {
 301                         /* It's a different page size.  Backfill the array. */
 302                         int j;
 303
 304                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 305
 306                         for (j = 0; j < i; j++) {
 307                                 info = &(page_cache->size_cache [j]);
 308                                 info->width = page_cache->uniform_width;
 309                                 info->height = page_cache->uniform_height;
 310                         }
 311                         page_cache->uniform = FALSE;
 312
 313                 }
 314
 315                 if (! page_cache->uniform) {
 316                         info = &(page_cache->size_cache [i]);
 317
 318                         info->width = page_width;
 319                         info->height = page_height;
 320                 }
 321         }
 322
 323         build_height_to_page (page_cache);
 324
 325         /* make some sanity check assertions */
 326         if (! page_cache->uniform)
 327                 g_assert (page_cache->size_cache != NULL);
 328         if (page_cache->uniform && page_cache->n_pages > 0)
 329                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 330
 331         ev_document_doc_mutex_unlock ();
 332
 333         if (page_cache->n_pages > 0)
 334                 ev_page_cache_set_current_page (page_cache, 0);
 335
 336         return page_cache;
 337 }
 338
 339 gint
 340 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 341 {
 342         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 343
 344         return page_cache->n_pages;
 345 }
 346
 347 gint
 348 ev_page_cache_get_current_page (EvPageCache *page_cache)
 349 {
 350         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 351
 352         return page_cache->current_page;
 353 }
 354
 355 void
 356 ev_page_cache_set_current_page (EvPageCache *page_cache,
 357                                 int          page)
 358 {
 359         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 360         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 361
 362         if (page == page_cache->current_page)
 363                 return;
 364
 365         page_cache->current_page = page;
 366         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 367 }
 368
 369 void
 370 ev_page_cache_set_current_page_history (EvPageCache *page_cache,
 371                                         int          page)
 372 {
 373         if (abs (page - page_cache->current_page) > 1)
 374                 g_signal_emit (page_cache, signals [HISTORY_CHANGED], 0, page);
 375
 376         ev_page_cache_set_current_page (page_cache, page);
 377 }
 378
 379 gboolean
 380 ev_page_cache_set_page_label (EvPageCache *page_cache,
 381                               const char  *page_label)
 382 {
 383         gint i, page;
 384         long value;
 385         char *endptr = NULL;
 386
 387         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 388         g_return_val_if_fail (page_label != NULL, FALSE);
 389
 390         /* First, look for a literal label match */
 391         for (i = 0; i < page_cache->n_pages; i ++) {
 392                 if (page_cache->page_labels[i] != NULL &&
 393                     ! strcmp (page_label, page_cache->page_labels[i])) {
 394                         ev_page_cache_set_current_page (page_cache, i);
 395                         return TRUE;
 396                 }
 397         }
 398
 399         /* Next, parse the label, and see if the number fits */
 400         value = strtol (page_label, &endptr, 10);
 401         if (endptr[0] == '\0') {
 402                 /* Page number is an integer */
 403                 page = MIN (G_MAXINT, value);
 404
 405                 /* convert from a page label to a page offset */
 406                 page --;
 407                 if (page >= 0 &&
 408                     page < page_cache->n_pages) {
 409                         ev_page_cache_set_current_page (page_cache, page);
 410                         return TRUE;
 411                 }
 412         }
 413
 414         return FALSE;
 415 }
 416
 417 const char *
 418 ev_page_cache_get_title (EvPageCache *page_cache)
 419 {
 420         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 421
 422         return page_cache->title;
 423 }
 424
 425 void
 426 ev_page_cache_get_size (EvPageCache  *page_cache,
 427                         gint          page,
 428                         gint          rotation,
 429                         gfloat        scale,
 430                         gint         *width,
 431                         gint         *height)
 432 {
 433         double w, h;
 434
 435         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 436         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 437
 438         if (page_cache->uniform) {
 439                 w = page_cache->uniform_width;
 440                 h = page_cache->uniform_height;
 441         } else {
 442                 EvPageCacheInfo *info;
 443
 444                 info = &(page_cache->size_cache [page]);
 445
 446                 w = info->width;
 447                 h = info->height;
 448         }
 449
 450         w = w * scale + 0.5;
 451         h = h * scale + 0.5;
 452
 453         if (rotation == 0 || rotation == 180) {
 454                 if (width) *width = (int)w;
 455                 if (height) *height = (int)h;
 456         } else {
 457                 if (width) *width = (int)h;
 458                 if (height) *height = (int)w;
 459         }
 460 }
 461
 462 void
 463 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 464                              gint           rotation,
 465                              gfloat         scale,
 466                              gint          *width)
 467 {
 468         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 469
 470         if (width) {
 471                 if (rotation == 0 || rotation == 180) {
 472                         *width = page_cache->max_width * scale;
 473                 } else {
 474                         *width = page_cache->max_height * scale;
 475                 }
 476         }
 477 }
 478
 479 void
 480 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 481                               gint           rotation,
 482                               gfloat         scale,
 483                               gint          *height)
 484 {
 485         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 486
 487         if (height) {
 488                 if (rotation == 0 || rotation == 180) {
 489                         *height = page_cache->max_height * scale;
 490                 } else {
 491                         *height = page_cache->max_width * scale;
 492                 }
 493         }
 494 }
 495
 496 void
 497 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 498                                   gint           page,
 499                                   gint           rotation,
 500                                   gfloat         scale,
 501                                   gint          *height,
 502                                   gint          *dual_height)
 503 {
 504         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 505
 506         if (page_cache->rotation != rotation) {
 507                 page_cache->rotation = rotation;
 508                 build_height_to_page (page_cache);
 509         }
 510
 511         if (height)
 512                 *height = page_cache->height_to_page [page] * scale;
 513
 514         if (dual_height)
 515                 *dual_height = page_cache->dual_height_to_page [page] * scale;
 516 }
 517
 518 gint
 519 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 520 {
 521         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 522
 523         return page_cache->max_label_chars;
 524 }
 525
 526 gboolean
 527 ev_page_cache_get_dual_even_left (EvPageCache *page_cache)
 528 {
 529         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 530
 531         return page_cache->dual_even_left;
 532 }
 533
 534 gchar *
 535 ev_page_cache_get_page_label (EvPageCache *page_cache,
 536                               gint         page)
 537 {
 538         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 539         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 540
 541         if (page_cache->page_labels[page] == NULL)
 542                 return g_strdup_printf ("%d", page + 1);
 543
 544         return g_strdup (page_cache->page_labels[page]);
 545 }
 546
 547 gboolean
 548 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 549 {
 550         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 551         return page_cache->has_labels;
 552 }
 553
 554 const EvDocumentInfo *
 555 ev_page_cache_get_info (EvPageCache *page_cache)
 556 {
 557         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 558
 559         return page_cache->page_info;
 560 }
 561
 562 #define PAGE_CACHE_STRING "ev-page-cache"
 563
 564 EvPageCache *
 565 ev_page_cache_get (EvDocument *document)
 566 {
 567         EvPageCache *page_cache;
 568
 569         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 570
 571         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 572         if (page_cache == NULL) {
 573                 page_cache = ev_page_cache_new (document);
 574                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 575         }
 576
 577         return page_cache;
 578 }