backend/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_page_width;
  31         double max_width_page_height;
  32         double max_height_page_width;
  33         double max_height_page_height;
  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         ev_document_info_free (page_cache->page_info);
  98 }
  99
 100 EvPageCache *
 101 _ev_page_cache_new (EvDocument *document)
 102 {
 103         EvDocumentInfo *doc_info;
 104         EvPageCache *page_cache;
 105         EvPageCacheInfo *info;
 106         gint i;
 107
 108         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 109
 110         ev_document_doc_mutex_lock ();
 111
 112         /* We read page information out of the document */
 113
 114         /* Assume all pages are the same size until proven otherwise */
 115         page_cache->uniform = TRUE;
 116         page_cache->has_labels = FALSE;
 117         page_cache->n_pages = ev_document_get_n_pages (document);
 118         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 119         page_cache->max_width_page_width = 0;
 120         page_cache->max_width_page_height = 0;
 121         page_cache->max_height_page_width = 0;
 122         page_cache->max_height_page_height = 0;
 123
 124         doc_info = ev_document_get_info (document);
 125         if (doc_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 126                 page_cache->title = g_strdup (doc_info->title);
 127         } else {
 128                 page_cache->title = NULL;
 129         }
 130         g_free (doc_info);
 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_page_width) {
 155                         page_cache->max_width_page_width = page_width;
 156                         page_cache->max_width_page_height = page_height;
 157                 }
 158
 159                 if (page_height > page_cache->max_height_page_height) {
 160                         page_cache->max_height_page_width = page_width;
 161                         page_cache->max_height_page_height = page_height;
 162                 }
 163
 164                 if (i == 0) {
 165                         page_cache->uniform_width = page_width;
 166                         page_cache->uniform_height = page_height;
 167                 } else if (page_cache->uniform &&
 168                            (page_cache->uniform_width != page_width ||
 169                             page_cache->uniform_height != page_height)) {
 170                         /* It's a different page size.  Backfill the array. */
 171                         int j;
 172
 173                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 174
 175                         for (j = 0; j < i; j++) {
 176                                 info = &(page_cache->size_cache [j]);
 177                                 info->width = page_cache->uniform_width;
 178                                 info->height = page_cache->uniform_height;
 179                         }
 180                         page_cache->uniform = FALSE;
 181
 182                 }
 183
 184                 if (! page_cache->uniform) {
 185                         info = &(page_cache->size_cache [i]);
 186
 187                         info->width = page_width;
 188                         info->height = page_height;
 189                 }
 190         }
 191
 192         page_cache->page_info = ev_document_get_info (document);
 193
 194         /* make some sanity check assertions */
 195         if (! page_cache->uniform)
 196                 g_assert (page_cache->size_cache != NULL);
 197         if (page_cache->uniform)
 198                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 199
 200         ev_document_doc_mutex_unlock ();
 201
 202         if (page_cache->n_pages > 0)
 203                 ev_page_cache_set_current_page (page_cache, 0);
 204
 205         return page_cache;
 206 }
 207
 208 gint
 209 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 210 {
 211         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 212
 213         return page_cache->n_pages;
 214 }
 215
 216 gint
 217 ev_page_cache_get_current_page (EvPageCache *page_cache)
 218 {
 219         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 220
 221         return page_cache->current_page;
 222 }
 223
 224 void
 225 ev_page_cache_set_current_page (EvPageCache *page_cache,
 226                                 int          page)
 227 {
 228         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 229         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 230
 231         if (page == page_cache->current_page)
 232                 return;
 233
 234         page_cache->current_page = page;
 235         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 236 }
 237
 238 gboolean
 239 ev_page_cache_set_page_label (EvPageCache *page_cache,
 240                               const char  *page_label)
 241 {
 242         gint i, page;
 243         long value;
 244         char *endptr = NULL;
 245
 246         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 247         g_return_val_if_fail (page_label != NULL, FALSE);
 248
 249         /* First, look for a literal label match */
 250         for (i = 0; i < page_cache->n_pages; i ++) {
 251                 if (page_cache->page_labels[i] != NULL &&
 252                     ! strcmp (page_label, page_cache->page_labels[i])) {
 253                         ev_page_cache_set_current_page (page_cache, i);
 254                         return TRUE;
 255                 }
 256         }
 257
 258         /* Next, parse the label, and see if the number fits */
 259         value = strtol (page_label, &endptr, 10);
 260         if (endptr[0] == '\0') {
 261                 /* Page number is an integer */
 262                 page = MIN (G_MAXINT, value);
 263
 264                 /* convert from a page label to a page offset */
 265                 page --;
 266                 if (page >= 0 &&
 267                     page < page_cache->n_pages &&
 268                     page_cache->page_labels[page] == NULL) {
 269                         ev_page_cache_set_current_page (page_cache, page);
 270                         return TRUE;
 271                 }
 272         }
 273
 274         return FALSE;
 275 }
 276
 277 void
 278 ev_page_cache_set_link (EvPageCache *page_cache,
 279                         EvLink      *link)
 280 {
 281         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 282         g_return_if_fail (EV_IS_LINK (link));
 283
 284         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 285 }
 286
 287 char *
 288 ev_page_cache_get_title (EvPageCache *page_cache)
 289 {
 290         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 291
 292         return page_cache->title;
 293 }
 294
 295 void
 296 ev_page_cache_get_size (EvPageCache *page_cache,
 297                         gint         page,
 298                         gfloat       scale,
 299                         gint        *width,
 300                         gint        *height)
 301 {
 302         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 303         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 304
 305         if (page_cache->uniform) {
 306                 if (width)
 307                         *width = page_cache->uniform_width;
 308                 if (height)
 309                         *height = page_cache->uniform_height;
 310         } else {
 311                 EvPageCacheInfo *info;
 312
 313                 info = &(page_cache->size_cache [page]);
 314
 315                 if (width)
 316                         *width = info->width;
 317                 if (height)
 318                         *height = info->height;
 319         }
 320
 321         if (width)
 322                 *width = (int) ((*width) * scale + 0.5);
 323         if (width)
 324                 *height = (int) ((*height) * scale + 0.5);
 325
 326 }
 327
 328
 329 /* Note that these aren't necessarily from the same page.
 330  */
 331 void
 332 ev_page_cache_get_max_width_size (EvPageCache *page_cache,
 333                                   gfloat       scale,
 334                                   gint        *width,
 335                                   gint        *height)
 336 {
 337         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 338
 339         if (width)
 340                 *width = page_cache->max_width_page_width * scale;
 341         if (height)
 342                 *height = page_cache->max_width_page_height * scale;
 343 }
 344
 345 void
 346 ev_page_cache_get_max_height_size (EvPageCache *page_cache,
 347                                    gfloat       scale,
 348                                    gint        *width,
 349                                    gint        *height)
 350 {
 351         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 352
 353         if (width)
 354                 *width = page_cache->max_height_page_width * scale;
 355         if (height)
 356                 *height = page_cache->max_height_page_height * scale;
 357 }
 358
 359 gint
 360 ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
 361 {
 362         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 363
 364         return page_cache->max_label_chars;
 365 }
 366
 367 gchar *
 368 ev_page_cache_get_page_label (EvPageCache *page_cache,
 369                               gint         page)
 370 {
 371         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 372         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 373
 374         if (page_cache->page_labels[page] == NULL)
 375                 return g_strdup_printf ("%d", page + 1);
 376
 377         return g_strdup (page_cache->page_labels[page]);
 378 }
 379
 380 gboolean
 381 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 382 {
 383         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 384         return page_cache->has_labels;
 385 }
 386
 387 const EvDocumentInfo *
 388 ev_page_cache_get_info (EvPageCache *page_cache)
 389 {
 390         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 391
 392         return page_cache->page_info;
 393 }
 394
 395
 396 gboolean
 397 ev_page_cache_next_page (EvPageCache *page_cache)
 398 {
 399         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 400
 401         if (page_cache->current_page >= page_cache->n_pages - 1)
 402                 return FALSE;
 403
 404         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 405         return TRUE;
 406
 407 }
 408
 409 gboolean
 410 ev_page_cache_prev_page (EvPageCache *page_cache)
 411 {
 412         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 413
 414         if (page_cache->current_page <= 0)
 415                 return FALSE;
 416
 417         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 418         return TRUE;
 419 }
 420