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