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