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                 g_strfreev (page_cache->page_labels);
 133                 page_cache->page_labels = NULL;
 134         }
 135
 136         if (page_cache->page_info) {
 137                 ev_document_info_free (page_cache->page_info);
 138                 page_cache->page_info = NULL;
 139         }
 140
 141         G_OBJECT_CLASS (ev_page_cache_parent_class)->finalize (object);
 142 }
 143
 144 static void
 145 build_height_to_page (EvPageCache *page_cache)
 146 {
 147         gboolean swap;
 148         int i;
 149         double uniform_height, page_height, next_page_height;
 150         double saved_height;
 151
 152         swap = (page_cache->rotation == 90 ||
 153                 page_cache->rotation == 270);
 154
 155         g_free (page_cache->height_to_page);
 156         g_free (page_cache->dual_height_to_page);
 157
 158         page_cache->height_to_page = g_new0(double, page_cache->n_pages + 1);
 159         page_cache->dual_height_to_page = g_new0(double, page_cache->n_pages + 2);
 160
 161         saved_height = 0;
 162         for (i = 0; i <= page_cache->n_pages; i++) {
 163                 if (page_cache->uniform) {
 164                         if (!swap) {
 165                                 uniform_height = page_cache->uniform_height;
 166                         } else {
 167                                 uniform_height = page_cache->uniform_width;
 168                         }
 169                         page_cache->height_to_page [i] = i * uniform_height;
 170                 } else {
 171                         if (!swap) {
 172                                 page_height = page_cache->size_cache [i].height;
 173                         } else {
 174                                 page_height = page_cache->size_cache [i].width;
 175                         }
 176                         page_cache->height_to_page [i] = saved_height;
 177                         saved_height += page_height;
 178                 }
 179         }
 180
 181         if (page_cache->dual_even_left && !page_cache->uniform) {
 182                 if (!swap) {
 183                         saved_height = page_cache->size_cache [0].height;
 184                 } else {
 185                         saved_height = page_cache->size_cache [0].width;
 186                 }
 187         } else {
 188                 saved_height = 0;
 189         }
 190         for (i = page_cache->dual_even_left; i < page_cache->n_pages + 2; i += 2) {
 191                 if (page_cache->uniform) {
 192                         if (!swap) {
 193                                 uniform_height = page_cache->uniform_height;
 194                         } else {
 195                                 uniform_height = page_cache->uniform_width;
 196                         }
 197                         page_cache->dual_height_to_page [i] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 198                         if (i + 1 < page_cache->n_pages + 2)
 199                                 page_cache->dual_height_to_page [i + 1] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
 200                 } else {
 201                         if (i + 1 < page_cache->n_pages) {
 202                                 if (!swap) {
 203                                         next_page_height = page_cache->size_cache [i + 1].height;
 204                                 } else {
 205                                         next_page_height = page_cache->size_cache [i + 1].width;
 206                                 }
 207                         } else {
 208                                 next_page_height = 0;
 209                         }
 210                         if (i < page_cache->n_pages) {
 211                                 if (!swap) {
 212                                         page_height = page_cache->size_cache [i].height;
 213                                 } else {
 214                                         page_height = page_cache->size_cache [i].width;
 215                                 }
 216                         } else {
 217                                 page_height = 0;
 218                         }
 219                         if (i + 1 < page_cache->n_pages + 2) {
 220                                 page_cache->dual_height_to_page [i] = saved_height;
 221                                 page_cache->dual_height_to_page [i + 1] = saved_height;
 222                                 saved_height += MAX(page_height, next_page_height);
 223                         } else {
 224                                 page_cache->dual_height_to_page [i] = saved_height;
 225                         }
 226                 }
 227         }
 228 }
 229
 230 EvPageCache *
 231 ev_page_cache_new (EvDocument *document)
 232 {
 233         EvPageCache *page_cache;
 234         EvPageCacheInfo *info;
 235         gint i;
 236
 237         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 238
 239         ev_document_doc_mutex_lock ();
 240
 241         /* We read page information out of the document */
 242
 243         /* Assume all pages are the same size until proven otherwise */
 244         page_cache->uniform = TRUE;
 245         page_cache->has_labels = FALSE;
 246         page_cache->n_pages = ev_document_get_n_pages (document);
 247         page_cache->dual_even_left = (page_cache->n_pages > 2);
 248         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 249         page_cache->max_width = 0;
 250         page_cache->max_height = 0;
 251         page_cache->page_info = ev_document_get_info (document);
 252
 253         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 254                 page_cache->title = g_strdup (page_cache->page_info->title);
 255         } else {
 256                 page_cache->title = NULL;
 257         }
 258
 259         for (i = 0; i < page_cache->n_pages; i++) {
 260                 double page_width = 0;
 261                 double page_height = 0;
 262
 263                 ev_document_get_page_size (document, i, &page_width, &page_height);
 264
 265                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 266
 267                 if (page_cache->page_labels[i] != NULL) {
 268
 269                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 270                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 271                         if (!page_cache->has_labels) {
 272                                 gchar *expected_label;
 273
 274                                 expected_label = g_strdup_printf ("%d", i + 1);
 275                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 276                                         page_cache->has_labels = TRUE;
 277                                 g_free (expected_label);
 278                         }
 279                 }
 280
 281                 if (page_width > page_cache->max_width) {
 282                         page_cache->max_width = page_width;
 283                 }
 284
 285                 if (page_height > page_cache->max_height) {
 286                         page_cache->max_height = page_height;
 287                 }
 288
 289                 if (i == 0) {
 290                         page_cache->uniform_width = page_width;
 291                         page_cache->uniform_height = page_height;
 292                 } else if (page_cache->uniform &&
 293                            (page_cache->uniform_width != page_width ||
 294                             page_cache->uniform_height != page_height)) {
 295                         /* It's a different page size.  Backfill the array. */
 296                         int j;
 297
 298                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 299
 300                         for (j = 0; j < i; j++) {
 301                                 info = &(page_cache->size_cache [j]);
 302                                 info->width = page_cache->uniform_width;
 303                                 info->height = page_cache->uniform_height;
 304                         }
 305                         page_cache->uniform = FALSE;
 306
 307                 }
 308
 309                 if (! page_cache->uniform) {
 310                         info = &(page_cache->size_cache [i]);
 311
 312                         info->width = page_width;
 313                         info->height = page_height;
 314                 }
 315         }
 316
 317         build_height_to_page (page_cache);
 318
 319         /* make some sanity check assertions */
 320         if (! page_cache->uniform)
 321                 g_assert (page_cache->size_cache != NULL);
 322         if (page_cache->uniform && page_cache->n_pages > 0)
 323                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 324
 325         ev_document_doc_mutex_unlock ();
 326
 327         if (page_cache->n_pages > 0)
 328                 ev_page_cache_set_current_page (page_cache, 0);
 329
 330         return page_cache;
 331 }
 332
 333 gint
 334 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 335 {
 336         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 337
 338         return page_cache->n_pages;
 339 }
 340
 341 gint
 342 ev_page_cache_get_current_page (EvPageCache *page_cache)
 343 {
 344         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 345
 346         return page_cache->current_page;
 347 }
 348
 349 void
 350 ev_page_cache_set_current_page (EvPageCache *page_cache,
 351                                 int          page)
 352 {
 353         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 354         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 355
 356         if (page == page_cache->current_page)
 357                 return;
 358
 359         page_cache->current_page = page;
 360         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 361 }
 362
 363 void
 364 ev_page_cache_set_current_page_history (EvPageCache *page_cache,
 365                                         int          page)
 366 {
 367         if (abs (page - page_cache->current_page) > 1)
 368                 g_signal_emit (page_cache, signals [HISTORY_CHANGED], 0, page);
 369
 370         ev_page_cache_set_current_page (page_cache, page);
 371 }
 372
 373 gboolean
 374 ev_page_cache_set_page_label (EvPageCache *page_cache,
 375                               const char  *page_label)
 376 {
 377         gint i, page;
 378         long value;
 379         char *endptr = NULL;
 380
 381         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 382         g_return_val_if_fail (page_label != NULL, FALSE);
 383
 384         /* First, look for a literal label match */
 385         for (i = 0; i < page_cache->n_pages; i ++) {
 386                 if (page_cache->page_labels[i] != NULL &&
 387                     ! strcmp (page_label, page_cache->page_labels[i])) {
 388                         ev_page_cache_set_current_page (page_cache, i);
 389                         return TRUE;
 390                 }
 391         }
 392
 393         /* Next, parse the label, and see if the number fits */
 394         value = strtol (page_label, &endptr, 10);
 395         if (endptr[0] == '\0') {
 396                 /* Page number is an integer */
 397                 page = MIN (G_MAXINT, value);
 398
 399                 /* convert from a page label to a page offset */
 400                 page --;
 401                 if (page >= 0 &&
 402                     page < page_cache->n_pages) {
 403                         ev_page_cache_set_current_page (page_cache, page);
 404                         return TRUE;
 405                 }
 406         }
 407
 408         return FALSE;
 409 }
 410
 411 const char *
 412 ev_page_cache_get_title (EvPageCache *page_cache)
 413 {
 414         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 415
 416         return page_cache->title;
 417 }
 418
 419 void
 420 ev_page_cache_get_size (EvPageCache  *page_cache,
 421                         gint          page,
 422                         gint          rotation,
 423                         gfloat        scale,
 424                         gint         *width,
 425                         gint         *height)
 426 {
 427         double w, h;
 428
 429         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 430         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 431
 432         if (page_cache->uniform) {
 433                 w = page_cache->uniform_width;
 434                 h = page_cache->uniform_height;
 435         } else {
 436                 EvPageCacheInfo *info;
 437
 438                 info = &(page_cache->size_cache [page]);
 439
 440                 w = info->width;
 441                 h = info->height;
 442         }
 443
 444         w = w * scale + 0.5;
 445         h = h * scale + 0.5;
 446
 447         if (rotation == 0 || rotation == 180) {
 448                 if (width) *width = (int)w;
 449                 if (height) *height = (int)h;
 450         } else {
 451                 if (width) *width = (int)h;
 452                 if (height) *height = (int)w;
 453         }
 454 }
 455
 456 void
 457 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 458                              gint           rotation,
 459                              gfloat         scale,
 460                              gint          *width)
 461 {
 462         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 463
 464         if (width) {
 465                 if (rotation == 0 || rotation == 180) {
 466                         *width = page_cache->max_width * scale;
 467                 } else {
 468                         *width = page_cache->max_height * scale;
 469                 }
 470         }
 471 }
 472
 473 void
 474 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 475                               gint           rotation,
 476                               gfloat         scale,
 477                               gint          *height)
 478 {
 479         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 480
 481         if (height) {
 482                 if (rotation == 0 || rotation == 180) {
 483                         *height = page_cache->max_height * scale;
 484                 } else {
 485                         *height = page_cache->max_width * scale;
 486                 }
 487         }
 488 }
 489
 490 void
 491 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 492                                   gint           page,
 493                                   gint           rotation,
 494                                   gfloat         scale,
 495                                   gint          *height,
 496                                   gint          *dual_height)
 497 {
 498         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 499
 500         if (page_cache->rotation != rotation) {
 501                 page_cache->rotation = rotation;
 502                 build_height_to_page (page_cache);
 503         }
 504
 505         if (height)
 506                 *height = page_cache->height_to_page [page] * scale;
 507
 508         if (dual_height)
 509                 *dual_height = page_cache->dual_height_to_page [page] * scale;
 510 }
 511
 512 gint
 513 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 514 {
 515         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 516
 517         return page_cache->max_label_chars;
 518 }
 519
 520 gboolean
 521 ev_page_cache_get_dual_even_left (EvPageCache *page_cache)
 522 {
 523         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 524
 525         return page_cache->dual_even_left;
 526 }
 527
 528 gchar *
 529 ev_page_cache_get_page_label (EvPageCache *page_cache,
 530                               gint         page)
 531 {
 532         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 533         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 534
 535         if (page_cache->page_labels[page] == NULL)
 536                 return g_strdup_printf ("%d", page + 1);
 537
 538         return g_strdup (page_cache->page_labels[page]);
 539 }
 540
 541 gboolean
 542 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 543 {
 544         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 545         return page_cache->has_labels;
 546 }
 547
 548 const EvDocumentInfo *
 549 ev_page_cache_get_info (EvPageCache *page_cache)
 550 {
 551         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 552
 553         return page_cache->page_info;
 554 }
 555
 556 #define PAGE_CACHE_STRING "ev-page-cache"
 557
 558 EvPageCache *
 559 ev_page_cache_get (EvDocument *document)
 560 {
 561         EvPageCache *page_cache;
 562
 563         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 564
 565         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 566         if (page_cache == NULL) {
 567                 page_cache = ev_page_cache_new (document);
 568                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 569         }
 570
 571         return page_cache;
 572 }