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         double* height_to_page;
  33         double* dual_height_to_page;
  34
  35         EvPageCacheInfo *size_cache;
  36         EvDocumentInfo *page_info;
  37 };
  38
  39 struct _EvPageCacheClass
  40 {
  41         GObjectClass parent_class;
  42
  43         void (* page_changed) (EvPageCache *page_cache, gint page);
  44 };
  45
  46 enum
  47 {
  48         PAGE_CHANGED,
  49         N_SIGNALS,
  50 };
  51
  52 static guint signals[N_SIGNALS] = {0, };
  53
  54 static void ev_page_cache_init       (EvPageCache      *page_cache);
  55 static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
  56 static void ev_page_cache_finalize   (GObject *object);
  57
  58 G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
  59
  60 static void
  61 ev_page_cache_init (EvPageCache *page_cache)
  62 {
  63         page_cache->current_page = -1;
  64         page_cache->max_label_chars = 0;
  65 }
  66
  67 static void
  68 ev_page_cache_class_init (EvPageCacheClass *class)
  69 {
  70         GObjectClass *object_class;
  71
  72         object_class = G_OBJECT_CLASS (class);
  73
  74         object_class->finalize = ev_page_cache_finalize;
  75
  76         signals [PAGE_CHANGED] =
  77                 g_signal_new ("page-changed",
  78                               EV_TYPE_PAGE_CACHE,
  79                               G_SIGNAL_RUN_LAST,
  80                               G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
  81                               NULL, NULL,
  82                               g_cclosure_marshal_VOID__INT,
  83                               G_TYPE_NONE, 1,
  84                               G_TYPE_INT);
  85
  86 }
  87
  88 static void
  89 ev_page_cache_finalize (GObject *object)
  90 {
  91         EvPageCache *page_cache;
  92
  93         page_cache = EV_PAGE_CACHE (object);
  94
  95         g_free (page_cache->title);
  96         g_free (page_cache->size_cache);
  97         g_free (page_cache->height_to_page);
  98         g_free (page_cache->dual_height_to_page);
  99
 100         ev_document_info_free (page_cache->page_info);
 101 }
 102
 103 EvPageCache *
 104 ev_page_cache_new (EvDocument *document)
 105 {
 106         EvPageCache *page_cache;
 107         EvPageCacheInfo *info;
 108         gint i;
 109         double saved_height;
 110
 111         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 112
 113         ev_document_doc_mutex_lock ();
 114
 115         /* We read page information out of the document */
 116
 117         /* Assume all pages are the same size until proven otherwise */
 118         page_cache->uniform = TRUE;
 119         page_cache->has_labels = FALSE;
 120         page_cache->n_pages = ev_document_get_n_pages (document);
 121         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 122         page_cache->max_width = 0;
 123         page_cache->max_height = 0;
 124         page_cache->page_info = ev_document_get_info (document);
 125
 126         if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 127                 page_cache->title = g_strdup (page_cache->page_info->title);
 128         } else {
 129                 page_cache->title = NULL;
 130         }
 131
 132         for (i = 0; i < page_cache->n_pages; i++) {
 133                 double page_width = 0;
 134                 double page_height = 0;
 135
 136                 ev_document_get_page_size (document, i, &page_width, &page_height);
 137
 138                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 139
 140                 if (page_cache->page_labels[i] != NULL) {
 141
 142                         page_cache->max_label_chars = MAX(page_cache->max_label_chars,
 143                                                             g_utf8_strlen (page_cache->page_labels[i], 256));
 144                         if (!page_cache->has_labels) {
 145                                 gchar *expected_label;
 146
 147                                 expected_label = g_strdup_printf ("%d", i + 1);
 148                                 if (strcmp (expected_label, page_cache->page_labels[i]))
 149                                         page_cache->has_labels = TRUE;
 150                                 g_free (expected_label);
 151                         }
 152                 }
 153
 154                 if (page_width > page_cache->max_width) {
 155                         page_cache->max_width = page_width;
 156                 }
 157
 158                 if (page_height > page_cache->max_height) {
 159                         page_cache->max_height = page_height;
 160                 }
 161
 162                 if (i == 0) {
 163                         page_cache->uniform_width = page_width;
 164                         page_cache->uniform_height = page_height;
 165                 } else if (page_cache->uniform &&
 166                            (page_cache->uniform_width != page_width ||
 167                             page_cache->uniform_height != page_height)) {
 168                         /* It's a different page size.  Backfill the array. */
 169                         int j;
 170
 171                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 172
 173                         for (j = 0; j < i; j++) {
 174                                 info = &(page_cache->size_cache [j]);
 175                                 info->width = page_cache->uniform_width;
 176                                 info->height = page_cache->uniform_height;
 177                         }
 178                         page_cache->uniform = FALSE;
 179
 180                 }
 181
 182                 if (! page_cache->uniform) {
 183                         info = &(page_cache->size_cache [i]);
 184
 185                         info->width = page_width;
 186                         info->height = page_height;
 187                 }
 188         }
 189
 190         page_cache->height_to_page = g_new0(double, page_cache->n_pages);
 191         page_cache->dual_height_to_page = g_new0(double, page_cache->n_pages / 2 + 1);
 192
 193         saved_height = 0;
 194         for (i = 0; i < page_cache->n_pages; i++) {
 195
 196                 if (page_cache->uniform) {
 197                         page_cache->height_to_page [i] = (i + 1) * page_cache->uniform_height;
 198                 } else {
 199                         page_cache->height_to_page [i] = saved_height + page_cache->size_cache [i].height;
 200                         saved_height = page_cache->height_to_page [i];
 201                 }
 202         }
 203
 204         saved_height = 0;
 205         for (i = 0; i < page_cache->n_pages; i += 2) {
 206
 207                 if (page_cache->uniform) {
 208                         page_cache->dual_height_to_page [i / 2] = (i / 2 + 1) * page_cache->uniform_height;
 209                 } else {
 210                         if (i == page_cache->n_pages - 1) {
 211                                 page_cache->dual_height_to_page [i / 2] =
 212                                         saved_height + page_cache->size_cache [i].height;
 213                         }
 214                         else {
 215                                 page_cache->dual_height_to_page [i / 2] = saved_height +
 216                                        MAX(page_cache->size_cache [i].height,
 217                                            page_cache->size_cache [i + 1].height);
 218                                 saved_height = page_cache->dual_height_to_page [i / 2];
 219                         }
 220                 }
 221         }
 222
 223         /* make some sanity check assertions */
 224         if (! page_cache->uniform)
 225                 g_assert (page_cache->size_cache != NULL);
 226         if (page_cache->uniform)
 227                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 228
 229         ev_document_doc_mutex_unlock ();
 230
 231         if (page_cache->n_pages > 0)
 232                 ev_page_cache_set_current_page (page_cache, 0);
 233
 234         return page_cache;
 235 }
 236
 237 gint
 238 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 239 {
 240         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 241
 242         return page_cache->n_pages;
 243 }
 244
 245 gint
 246 ev_page_cache_get_current_page (EvPageCache *page_cache)
 247 {
 248         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 249
 250         return page_cache->current_page;
 251 }
 252
 253 void
 254 ev_page_cache_set_current_page (EvPageCache *page_cache,
 255                                 int          page)
 256 {
 257         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 258         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 259
 260         if (page == page_cache->current_page)
 261                 return;
 262
 263         page_cache->current_page = page;
 264         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 265 }
 266
 267 gboolean
 268 ev_page_cache_set_page_label (EvPageCache *page_cache,
 269                               const char  *page_label)
 270 {
 271         gint i, page;
 272         long value;
 273         char *endptr = NULL;
 274
 275         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 276         g_return_val_if_fail (page_label != NULL, FALSE);
 277
 278         /* First, look for a literal label match */
 279         for (i = 0; i < page_cache->n_pages; i ++) {
 280                 if (page_cache->page_labels[i] != NULL &&
 281                     ! strcmp (page_label, page_cache->page_labels[i])) {
 282                         ev_page_cache_set_current_page (page_cache, i);
 283                         return TRUE;
 284                 }
 285         }
 286
 287         /* Next, parse the label, and see if the number fits */
 288         value = strtol (page_label, &endptr, 10);
 289         if (endptr[0] == '\0') {
 290                 /* Page number is an integer */
 291                 page = MIN (G_MAXINT, value);
 292
 293                 /* convert from a page label to a page offset */
 294                 page --;
 295                 if (page >= 0 &&
 296                     page < page_cache->n_pages &&
 297                     page_cache->page_labels[page] == NULL) {
 298                         ev_page_cache_set_current_page (page_cache, page);
 299                         return TRUE;
 300                 }
 301         }
 302
 303         return FALSE;
 304 }
 305
 306 void
 307 ev_page_cache_set_link (EvPageCache *page_cache,
 308                         EvLink      *link)
 309 {
 310         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 311         g_return_if_fail (EV_IS_LINK (link));
 312
 313         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 314 }
 315
 316 const char *
 317 ev_page_cache_get_title (EvPageCache *page_cache)
 318 {
 319         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 320
 321         return page_cache->title;
 322 }
 323
 324 void
 325 ev_page_cache_get_size (EvPageCache  *page_cache,
 326                         gint          page,
 327                         EvOrientation orientation,
 328                         gfloat        scale,
 329                         gint         *width,
 330                         gint         *height)
 331 {
 332         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 333         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 334
 335         if (page_cache->uniform) {
 336                 if (width)
 337                         *width = page_cache->uniform_width;
 338                 if (height)
 339                         *height = page_cache->uniform_height;
 340         } else {
 341                 EvPageCacheInfo *info;
 342
 343                 info = &(page_cache->size_cache [page]);
 344
 345                 if (width)
 346                         *width = info->width;
 347                 if (height)
 348                         *height = info->height;
 349         }
 350
 351         if (width)
 352                 *width = (int) ((*width) * scale + 0.5);
 353         if (width)
 354                 *height = (int) ((*height) * scale + 0.5);
 355
 356 }
 357
 358
 359 void
 360 ev_page_cache_get_max_width      (EvPageCache *page_cache,
 361                                   gfloat       scale,
 362                                   gint        *width)
 363 {
 364         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 365
 366         if (width)
 367                 *width = page_cache->max_width * scale;
 368 }
 369
 370 void
 371 ev_page_cache_get_max_height      (EvPageCache *page_cache,
 372                                    gfloat       scale,
 373                                    gint        *height)
 374 {
 375         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 376
 377         if (height)
 378                 *height = page_cache->max_height * scale;
 379 }
 380
 381 void
 382 ev_page_cache_get_height_to_page (EvPageCache *page_cache,
 383                                   gint page,
 384                                   gfloat       scale,
 385                                   gint        *height,
 386                                   gint        *dual_height)
 387 {
 388         double result = 0.0;
 389         double dual_result = 0.0;
 390
 391         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 392
 393         if (page > 0)
 394                 result = page_cache->height_to_page [page - 1];
 395
 396         if (height)
 397                 *height = result * scale;
 398
 399         if (page > 1)
 400                 dual_result = page_cache->dual_height_to_page [page / 2 - 1];
 401
 402         if (dual_height)
 403                 *dual_height = dual_result * scale;
 404 }
 405
 406 gint
 407 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 408 {
 409         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 410
 411         return page_cache->max_label_chars;
 412 }
 413
 414 gchar *
 415 ev_page_cache_get_page_label (EvPageCache *page_cache,
 416                               gint         page)
 417 {
 418         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 419         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 420
 421         if (page_cache->page_labels[page] == NULL)
 422                 return g_strdup_printf ("%d", page + 1);
 423
 424         return g_strdup (page_cache->page_labels[page]);
 425 }
 426
 427 gboolean
 428 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 429 {
 430         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 431         return page_cache->has_labels;
 432 }
 433
 434 const EvDocumentInfo *
 435 ev_page_cache_get_info (EvPageCache *page_cache)
 436 {
 437         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 438
 439         return page_cache->page_info;
 440 }
 441
 442
 443 gboolean
 444 ev_page_cache_next_page (EvPageCache *page_cache)
 445 {
 446         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 447
 448         if (page_cache->current_page >= page_cache->n_pages - 1)
 449                 return FALSE;
 450
 451         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 452         return TRUE;
 453
 454 }
 455
 456 gboolean
 457 ev_page_cache_prev_page (EvPageCache *page_cache)
 458 {
 459         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 460
 461         if (page_cache->current_page <= 0)
 462                 return FALSE;
 463
 464         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 465         return TRUE;
 466 }
 467
 468 #define PAGE_CACHE_STRING "ev-page-cache"
 469
 470 EvPageCache *
 471 ev_page_cache_get (EvDocument *document)
 472 {
 473         EvPageCache *page_cache;
 474
 475         g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
 476
 477         page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
 478         if (page_cache == NULL) {
 479                 page_cache = ev_page_cache_new (document);
 480                 g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
 481         }
 482
 483         return page_cache;
 484 }