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