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         int rotation;
  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->rotation == 90 ||
 115                 page_cache->rotation == 270);
 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->n_pages = ev_document_get_n_pages (document);
 190         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 191         page_cache->max_width = 0;
 192         page_cache->max_height = 0;
 193         page_cache->page_info = ev_document_get_info (document);
 194
 195         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 196                 page_cache->title = g_strdup (page_cache->page_info->title);
 197         } else {
 198                 page_cache->title = NULL;
 199         }
 200
 201         for (i = 0; i < page_cache->n_pages; i++) {
 202                 double page_width = 0;
 203                 double page_height = 0;
 204
 205                 ev_document_get_page_size (document, i, &page_width, &page_height);
 206
 207                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 208
 209                 if (page_cache->page_labels[i] != NULL) {
 210
 211                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 212                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 213                         if (!page_cache->has_labels) {
 214                                 gchar *expected_label;
 215
 216                                 expected_label = g_strdup_printf ("%d", i + 1);
 217                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 218                                         page_cache->has_labels = TRUE;
 219                                 g_free (expected_label);
 220                         }
 221                 }
 222
 223                 if (page_width > page_cache->max_width) {
 224                         page_cache->max_width = page_width;
 225                 }
 226
 227                 if (page_height > page_cache->max_height) {
 228                         page_cache->max_height = page_height;
 229                 }
 230
 231                 if (i == 0) {
 232                         page_cache->uniform_width = page_width;
 233                         page_cache->uniform_height = page_height;
 234                 } else if (page_cache->uniform &&
 235                            (page_cache->uniform_width != page_width ||
 236                             page_cache->uniform_height != page_height)) {
 237                         /* It's a different page size.  Backfill the array. */
 238                         int j;
 239
 240                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 241
 242                         for (j = 0; j < i; j++) {
 243                                 info = &(page_cache->size_cache [j]);
 244                                 info->width = page_cache->uniform_width;
 245                                 info->height = page_cache->uniform_height;
 246                         }
 247                         page_cache->uniform = FALSE;
 248
 249                 }
 250
 251                 if (! page_cache->uniform) {
 252                         info = &(page_cache->size_cache [i]);
 253
 254                         info->width = page_width;
 255                         info->height = page_height;
 256                 }
 257         }
 258
 259         build_height_to_page (page_cache);
 260
 261         /* make some sanity check assertions */
 262         if (! page_cache->uniform)
 263                 g_assert (page_cache->size_cache != NULL);
 264         if (page_cache->uniform && page_cache->n_pages > 0)
 265                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 266
 267         ev_document_doc_mutex_unlock ();
 268
 269         if (page_cache->n_pages > 0)
 270                 ev_page_cache_set_current_page (page_cache, 0);
 271
 272         return page_cache;
 273 }
 274
 275 gint
 276 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 277 {
 278         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 279
 280         return page_cache->n_pages;
 281 }
 282
 283 gint
 284 ev_page_cache_get_current_page (EvPageCache *page_cache)
 285 {
 286         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 287
 288         return page_cache->current_page;
 289 }
 290
 291 void
 292 ev_page_cache_set_current_page (EvPageCache *page_cache,
 293                                 int          page)
 294 {
 295         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 296         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 297
 298         if (page == page_cache->current_page)
 299                 return;
 300
 301         page_cache->current_page = page;
 302         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 303 }
 304
 305 gboolean
 306 ev_page_cache_set_page_label (EvPageCache *page_cache,
 307                               const char  *page_label)
 308 {
 309         gint i, page;
 310         long value;
 311         char *endptr = NULL;
 312
 313         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 314         g_return_val_if_fail (page_label != NULL, FALSE);
 315
 316         /* First, look for a literal label match */
 317         for (i = 0; i < page_cache->n_pages; i ++) {
 318                 if (page_cache->page_labels[i] != NULL &&
 319                     ! strcmp (page_label, page_cache->page_labels[i])) {
 320                         ev_page_cache_set_current_page (page_cache, i);
 321                         return TRUE;
 322                 }
 323         }
 324
 325         /* Next, parse the label, and see if the number fits */
 326         value = strtol (page_label, &endptr, 10);
 327         if (endptr[0] == '\0') {
 328                 /* Page number is an integer */
 329                 page = MIN (G_MAXINT, value);
 330
 331                 /* convert from a page label to a page offset */
 332                 page --;
 333                 if (page >= 0 &&
 334                     page < page_cache->n_pages &&
 335                     page_cache->page_labels[page] == NULL) {
 336                         ev_page_cache_set_current_page (page_cache, page);
 337                         return TRUE;
 338                 }
 339         }
 340
 341         return FALSE;
 342 }
 343
 344 const char *
 345 ev_page_cache_get_title (EvPageCache *page_cache)
 346 {
 347         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 348
 349         return page_cache->title;
 350 }
 351
 352 void
 353 ev_page_cache_get_size (EvPageCache  *page_cache,
 354                         gint          page,
 355                         gint          rotation,
 356                         gfloat        scale,
 357                         gint         *width,
 358                         gint         *height)
 359 {
 360         int w, h;
 361
 362         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 363         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 364
 365         if (page_cache->uniform) {
 366                 w = page_cache->uniform_width;
 367                 h = page_cache->uniform_height;
 368         } else {
 369                 EvPageCacheInfo *info;
 370
 371                 info = &(page_cache->size_cache [page]);
 372
 373                 w = info->width;
 374                 h = info->height;
 375         }
 376
 377         w = (int) (w * scale + 0.5);
 378         h = (int) (h * scale + 0.5);
 379
 380         if (rotation == 0 || rotation == 180) {
 381                 if (width) *width = w;
 382                 if (height) *height = h;
 383         } else {
 384                 if (width) *width = h;
 385                 if (height) *height = w;
 386         }
 387 }
 388
 389 void
 390 ev_page_cache_get_max_width (EvPageCache   *page_cache,
 391                              gint           rotation,
 392                              gfloat         scale,
 393                              gint          *width)
 394 {
 395         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 396
 397         if (width) {
 398                 if (rotation == 0 || rotation == 180) {
 399                         *width = page_cache->max_width * scale;
 400                 } else {
 401                         *width = page_cache->max_height * scale;
 402                 }
 403         }
 404 }
 405
 406 void
 407 ev_page_cache_get_max_height (EvPageCache   *page_cache,
 408                               gint           rotation,
 409                               gfloat         scale,
 410                               gint          *height)
 411 {
 412         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 413
 414         if (height) {
 415                 if (rotation == 0 || rotation == 180) {
 416                         *height = page_cache->max_height * scale;
 417                 } else {
 418                         *height = page_cache->max_width * scale;
 419                 }
 420         }
 421 }
 422
 423 void
 424 ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
 425                                   gint           page,
 426                                   gint           rotation,
 427                                   gfloat         scale,
 428                                   gint          *height,
 429                                   gint          *dual_height)
 430 {
 431         double result = 0.0;
 432         double dual_result = 0.0;
 433
 434         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 435
 436         if (page_cache->rotation != rotation) {
 437                 page_cache->rotation = rotation;
 438                 build_height_to_page (page_cache);
 439         }
 440
 441         if (page > 0)
 442                 result = page_cache->height_to_page [page - 1];
 443
 444         if (height)
 445                 *height = result * scale;
 446
 447         if (page > 1)
 448                 dual_result = page_cache->dual_height_to_page [page / 2 - 1];
 449
 450         if (dual_height)
 451                 *dual_height = dual_result * scale;
 452 }
 453
 454 gint
 455 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 456 {
 457         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 458
 459         return page_cache->max_label_chars;
 460 }
 461
 462 gchar *
 463 ev_page_cache_get_page_label (EvPageCache *page_cache,
 464                               gint         page)
 465 {
 466         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 467         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 468
 469         if (page_cache->page_labels[page] == NULL)
 470                 return g_strdup_printf ("%d", page + 1);
 471
 472         return g_strdup (page_cache->page_labels[page]);
 473 }
 474
 475 gboolean
 476 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 477 {
 478         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 479         return page_cache->has_labels;
 480 }
 481
 482 const EvDocumentInfo *
 483 ev_page_cache_get_info (EvPageCache *page_cache)
 484 {
 485         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 486
 487         return page_cache->page_info;
 488 }
 489
 490
 491 gboolean
 492 ev_page_cache_next_page (EvPageCache *page_cache)
 493 {
 494         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 495
 496         if (page_cache->current_page >= page_cache->n_pages - 1)
 497                 return FALSE;
 498
 499         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 500         return TRUE;
 501
 502 }
 503
 504 gboolean
 505 ev_page_cache_prev_page (EvPageCache *page_cache)
 506 {
 507         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 508
 509         if (page_cache->current_page <= 0)
 510                 return FALSE;
 511
 512         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 513         return TRUE;
 514 }
 515
 516 #define PAGE_CACHE_STRING "ev-page-cache"
 517
 518 EvPageCache *
 519 ev_page_cache_get (EvDocument *document)
 520 {
 521         EvPageCache *page_cache;
 522
 523         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 524
 525         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 526         if (page_cache == NULL) {
 527                 page_cache = ev_page_cache_new (document);
 528                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 529         }
 530
 531         return page_cache;
 532 }