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