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
  27         double uniform_width;
  28         double uniform_height;
  29
  30         double  max_width;
  31         double  max_height;
  32
  33         double* height_to_page;
  34         double* dual_height_to_page;
  35
  36         EvOrientation orientation;
  37
  38         EvPageCacheInfo *size_cache;
  39         EvDocumentInfo *page_info;
  40 };
  41
  42 struct _EvPageCacheClass
  43 {
  44         GObjectClass parent_class;
  45
  46         void (* page_changed) (EvPageCache *page_cache, gint page);
  47 };
  48
  49 enum
  50 {
  51         PAGE_CHANGED,
  52         N_SIGNALS,
  53 };
  54
  55 static guint signals[N_SIGNALS] = {0, };
  56
  57 static void ev_page_cache_init       (EvPageCache      *page_cache);
  58 static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
  59 static void ev_page_cache_finalize   (GObject *object);
  60
  61 G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
  62
  63 static void
  64 ev_page_cache_init (EvPageCache *page_cache)
  65 {
  66         page_cache->current_page = -1;
  67         page_cache->max_label_chars = 0;
  68 }
  69
  70 static void
  71 ev_page_cache_class_init (EvPageCacheClass *class)
  72 {
  73         GObjectClass *object_class;
  74
  75         object_class = G_OBJECT_CLASS (class);
  76
  77         object_class->finalize = ev_page_cache_finalize;
  78
  79         signals [PAGE_CHANGED] =
  80                 g_signal_new ("page-changed",
  81                               EV_TYPE_PAGE_CACHE,
  82                               G_SIGNAL_RUN_LAST,
  83                               G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
  84                               NULL, NULL,
  85                               g_cclosure_marshal_VOID__INT,
  86                               G_TYPE_NONE, 1,
  87                               G_TYPE_INT);
  88
  89 }
  90
  91 static void
  92 ev_page_cache_finalize (GObject *object)
  93 {
  94         EvPageCache *page_cache;
  95
  96         page_cache = EV_PAGE_CACHE (object);
  97
  98         g_free (page_cache->title);
  99         g_free (page_cache->size_cache);
 100         g_free (page_cache->height_to_page);
 101         g_free (page_cache->dual_height_to_page);
 102
 103         ev_document_info_free (page_cache->page_info);
 104 }
 105
 106 static void
 107 build_height_to_page (EvPageCache *page_cache)
 108 {
 109         gboolean swap;
 110         int i;
 111         double uniform_height, page_height, next_page_height;
 112         double saved_height;
 113
 114         swap = (page_cache->orientation == EV_ORIENTATION_LANDSCAPE ||
 115                 page_cache->orientation == EV_ORIENTATION_SEASCAPE);
 116
 117         g_free (page_cache->height_to_page);
 118         g_free (page_cache->dual_height_to_page);
 119
 120         page_cache->height_to_page = g_new0(double, page_cache->n_pages);
 121         page_cache->dual_height_to_page = g_new0(double, page_cache->n_pages / 2 + 1);
 122
 123         saved_height = 0;
 124         for (i = 0; i < page_cache->n_pages; i++) {
 125                 if (page_cache->uniform) {
 126                         if (!swap) {
 127                                 uniform_height = page_cache->uniform_height;
 128                         } else {
 129                                 uniform_height = page_cache->uniform_width;
 130                         }
 131                         page_cache->height_to_page [i] = (i + 1) * uniform_height;
 132                 } else {
 133                         if (swap) {
 134                                 page_height = page_cache->size_cache [i].height;
 135                         } else {
 136                                 page_height = page_cache->size_cache [i].width;
 137                         }
 138                         page_cache->height_to_page [i] = saved_height + page_height;
 139                         saved_height = page_cache->height_to_page [i];
 140                 }
 141         }
 142
 143         saved_height = 0;
 144         for (i = 0; i < page_cache->n_pages; i += 2) {
 145                 if (page_cache->uniform) {
 146                         if (!swap) {
 147                                 uniform_height = page_cache->uniform_height;
 148                         } else {
 149                                 uniform_height = page_cache->uniform_width;
 150                         }
 151                         page_cache->dual_height_to_page [i / 2] = (i / 2 + 1) * uniform_height;
 152                 } else {
 153                         if (!swap) {
 154                                 page_height = page_cache->size_cache [i].height;
 155                                 next_page_height = page_cache->size_cache [i + 1].height;
 156                         } else {
 157                                 page_height = page_cache->size_cache [i].width;
 158                                 next_page_height = page_cache->size_cache [i + 1].width;
 159                         }
 160                         if (i == page_cache->n_pages - 1) {
 161                                 page_cache->dual_height_to_page [i / 2] =
 162                                         saved_height + page_height;
 163                         }
 164                         else {
 165                                 page_cache->dual_height_to_page [i / 2] = saved_height +
 166                                        MAX(page_height, next_page_height);
 167                                 saved_height = page_cache->dual_height_to_page [i / 2];
 168                         }
 169                 }
 170         }
 171 }
 172
 173 EvPageCache *
 174 ev_page_cache_new (EvDocument *document)
 175 {
 176         EvPageCache *page_cache;
 177         EvPageCacheInfo *info;
 178         gint i;
 179
 180         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 181
 182         ev_document_doc_mutex_lock ();
 183
 184         /* We read page information out of the document */
 185
 186         /* Assume all pages are the same size until proven otherwise */
 187         page_cache->uniform = TRUE;
 188         page_cache->has_labels = FALSE;
 189         page_cache->orientation = ev_document_get_orientation (document);
 190         page_cache->n_pages = ev_document_get_n_pages (document);
 191         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 192         page_cache->max_width = 0;
 193         page_cache->max_height = 0;
 194         page_cache->page_info = ev_document_get_info (document);
 195
 196         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 197                 page_cache->title = g_strdup (page_cache->page_info->title);
 198         } else {
 199                 page_cache->title = NULL;
 200         }
 201
 202         for (i = 0; i < page_cache->n_pages; i++) {
 203                 double page_width = 0;
 204                 double page_height = 0;
 205
 206                 ev_document_get_page_size (document, i, &page_width, &page_height);
 207
 208                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 209
 210                 if (page_cache->page_labels[i] != NULL) {
 211
 212                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 213                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 214                         if (!page_cache->has_labels) {
 215                                 gchar *expected_label;
 216
 217                                 expected_label = g_strdup_printf ("%d", i + 1);
 218                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 219                                         page_cache->has_labels = TRUE;
 220                                 g_free (expected_label);
 221                         }
 222                 }
 223
 224                 if (page_width > page_cache->max_width) {
 225                         page_cache->max_width = page_width;
 226                 }
 227
 228                 if (page_height > page_cache->max_height) {
 229                         page_cache->max_height = page_height;
 230                 }
 231
 232                 if (i == 0) {
 233                         page_cache->uniform_width = page_width;
 234                         page_cache->uniform_height = page_height;
 235                 } else if (page_cache->uniform &&
 236                            (page_cache->uniform_width != page_width ||
 237                             page_cache->uniform_height != page_height)) {
 238                         /* It's a different page size.  Backfill the array. */
 239                         int j;
 240
 241                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 242
 243                         for (j = 0; j < i; j++) {
 244                                 info = &(page_cache->size_cache [j]);
 245                                 info->width = page_cache->uniform_width;
 246                                 info->height = page_cache->uniform_height;
 247                         }
 248                         page_cache->uniform = FALSE;
 249
 250                 }
 251
 252                 if (! page_cache->uniform) {
 253                         info = &(page_cache->size_cache [i]);
 254
 255                         info->width = page_width;
 256                         info->height = page_height;
 257                 }
 258         }
 259
 260         build_height_to_page (page_cache);
 261
 262         /* make some sanity check assertions */
 263         if (! page_cache->uniform)
 264                 g_assert (page_cache->size_cache != NULL);
 265         if (page_cache->uniform)
 266                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 267
 268         ev_document_doc_mutex_unlock ();
 269
 270         if (page_cache->n_pages > 0)
 271                 ev_page_cache_set_current_page (page_cache, 0);
 272
 273         return page_cache;
 274 }
 275
 276 gint
 277 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 278 {
 279         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 280
 281         return page_cache->n_pages;
 282 }
 283
 284 gint
 285 ev_page_cache_get_current_page (EvPageCache *page_cache)
 286 {
 287         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 288
 289         return page_cache->current_page;
 290 }
 291
 292 void
 293 ev_page_cache_set_current_page (EvPageCache *page_cache,
 294                                 int          page)
 295 {
 296         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 297         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 298
 299         if (page == page_cache->current_page)
 300                 return;
 301
 302         page_cache->current_page = page;
 303         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 304 }
 305
 306 gboolean
 307 ev_page_cache_set_page_label (EvPageCache *page_cache,
 308                               const char  *page_label)
 309 {
 310         gint i, page;
 311         long value;
 312         char *endptr = NULL;
 313
 314         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 315         g_return_val_if_fail (page_label != NULL, FALSE);
 316
 317         /* First, look for a literal label match */
 318         for (i = 0; i < page_cache->n_pages; i ++) {
 319                 if (page_cache->page_labels[i] != NULL &&
 320                     ! strcmp (page_label, page_cache->page_labels[i])) {
 321                         ev_page_cache_set_current_page (page_cache, i);
 322                         return TRUE;
 323                 }
 324         }
 325
 326         /* Next, parse the label, and see if the number fits */
 327         value = strtol (page_label, &endptr, 10);
 328         if (endptr[0] == '\0') {
 329                 /* Page number is an integer */
 330                 page = MIN (G_MAXINT, value);
 331
 332                 /* convert from a page label to a page offset */
 333                 page --;
 334                 if (page >= 0 &&
 335                     page < page_cache->n_pages &&
 336                     page_cache->page_labels[page] == NULL) {
 337                         ev_page_cache_set_current_page (page_cache, page);
 338                         return TRUE;
 339                 }
 340         }
 341
 342         return FALSE;
 343 }
 344
 345 void
 346 ev_page_cache_set_link (EvPageCache *page_cache,
 347                         EvLink      *link)
 348 {
 349         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 350         g_return_if_fail (EV_IS_LINK (link));
 351
 352         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 353 }
 354
 355 const char *
 356 ev_page_cache_get_title (EvPageCache *page_cache)
 357 {
 358         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 359
 360         return page_cache->title;
 361 }
 362
 363 void
 364 ev_page_cache_get_size (EvPageCache  *page_cache,
 365                         gint          page,
 366                         EvOrientation orientation,
 367                         gfloat        scale,
 368                         gint         *width,
 369                         gint         *height)
 370 {
 371         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 372         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 373
 374         if (page_cache->uniform) {
 375                 if (width)
 376                         *width = page_cache->uniform_width;
 377                 if (height)
 378                         *height = page_cache->uniform_height;
 379         } else {
 380                 EvPageCacheInfo *info;
 381
 382                 info = &(page_cache->size_cache [page]);
 383
 384                 if (width)
 385                         *width = info->width;
 386                 if (height)
 387                         *height = info->height;
 388         }
 389
 390         if (orientation == EV_ORIENTATION_PORTRAIT ||
 391             orientation == EV_ORIENTATION_UPSIDEDOWN) {
 392                 if (width)
 393                         *width = (int) ((*width) * scale + 0.5);
 394                 if (height)
 395                         *height = (int) ((*height) * scale + 0.5);
 396         } else {
 397                 if (width)
 398                         *width = (int) ((*height) * scale + 0.5);
 399                 if (height)
 400                         *height = (int) ((*width) * scale + 0.5);
 401         }
 402 }
 403
 404 void
 405 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 406                              EvOrientation  orientation,
 407                              gfloat         scale,
 408                              gint          *width)
 409 {
 410         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 411
 412         if (width) {
 413                 if (orientation == EV_ORIENTATION_PORTRAIT ||
 414                     orientation == EV_ORIENTATION_UPSIDEDOWN) {
 415                         *width = page_cache->max_width * scale;
 416                 } else {
 417                         *width = page_cache->max_height * scale;
 418                 }
 419         }
 420 }
 421
 422 void
 423 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 424                               EvOrientation  orientation,
 425                               gfloat         scale,
 426                               gint          *height)
 427 {
 428         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 429
 430         if (height) {
 431                 if (orientation == EV_ORIENTATION_PORTRAIT ||
 432                     orientation == EV_ORIENTATION_UPSIDEDOWN) {
 433                         *height = page_cache->max_height * scale;
 434                 } else {
 435                         *height = page_cache->max_width * scale;
 436                 }
 437         }
 438 }
 439
 440 void
 441 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 442                                   gint           page,
 443                                   EvOrientation  orientation,
 444                                   gfloat         scale,
 445                                   gint          *height,
 446                                   gint          *dual_height)
 447 {
 448         double result = 0.0;
 449         double dual_result = 0.0;
 450
 451         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 452
 453         if (page_cache->orientation != orientation) {
 454                 page_cache->orientation = orientation;
 455                 build_height_to_page (page_cache);
 456         }
 457
 458         if (page > 0)
 459                 result = page_cache->height_to_page [page - 1];
 460
 461         if (height)
 462                 *height = result * scale;
 463
 464         if (page > 1)
 465                 dual_result = page_cache->dual_height_to_page [page / 2 - 1];
 466
 467         if (dual_height)
 468                 *dual_height = dual_result * scale;
 469 }
 470
 471 gint
 472 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 473 {
 474         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 475
 476         return page_cache->max_label_chars;
 477 }
 478
 479 gchar *
 480 ev_page_cache_get_page_label (EvPageCache *page_cache,
 481                               gint         page)
 482 {
 483         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 484         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 485
 486         if (page_cache->page_labels[page] == NULL)
 487                 return g_strdup_printf ("%d", page + 1);
 488
 489         return g_strdup (page_cache->page_labels[page]);
 490 }
 491
 492 gboolean
 493 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 494 {
 495         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 496         return page_cache->has_labels;
 497 }
 498
 499 const EvDocumentInfo *
 500 ev_page_cache_get_info (EvPageCache *page_cache)
 501 {
 502         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 503
 504         return page_cache->page_info;
 505 }
 506
 507
 508 gboolean
 509 ev_page_cache_next_page (EvPageCache *page_cache)
 510 {
 511         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 512
 513         if (page_cache->current_page >= page_cache->n_pages - 1)
 514                 return FALSE;
 515
 516         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 517         return TRUE;
 518
 519 }
 520
 521 gboolean
 522 ev_page_cache_prev_page (EvPageCache *page_cache)
 523 {
 524         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 525
 526         if (page_cache->current_page <= 0)
 527                 return FALSE;
 528
 529         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 530         return TRUE;
 531 }
 532
 533 #define PAGE_CACHE_STRING "ev-page-cache"
 534
 535 EvPageCache *
 536 ev_page_cache_get (EvDocument *document)
 537 {
 538         EvPageCache *page_cache;
 539
 540         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 541
 542         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 543         if (page_cache == NULL) {
 544                 page_cache = ev_page_cache_new (document);
 545                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 546         }
 547
 548         return page_cache;
 549 }