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         gboolean has_labels;
  24         gboolean uniform;
  25
  26         double uniform_width;
  27         double uniform_height;
  28
  29         double max_width_page_width;
  30         double max_width_page_height;
  31         double max_height_page_width;
  32         double max_height_page_height;
  33
  34         EvPageCacheInfo *size_cache;
  35 };
  36
  37 struct _EvPageCacheClass
  38 {
  39         GObjectClass parent_class;
  40
  41         void (* page_changed) (EvPageCache *page_cache, gint page);
  42 };
  43
  44 enum
  45 {
  46         PAGE_CHANGED,
  47         N_SIGNALS,
  48 };
  49
  50 static guint signals[N_SIGNALS] = {0, };
  51
  52 static void ev_page_cache_init       (EvPageCache      *page_cache);
  53 static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
  54 static void ev_page_cache_finalize   (GObject *object);
  55
  56 G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
  57
  58 static void
  59 ev_page_cache_init (EvPageCache *page_cache)
  60 {
  61         page_cache->current_page = -1;
  62 }
  63
  64 static void
  65 ev_page_cache_class_init (EvPageCacheClass *class)
  66 {
  67         GObjectClass *object_class;
  68
  69         object_class = G_OBJECT_CLASS (class);
  70
  71         object_class->finalize = ev_page_cache_finalize;
  72
  73         signals [PAGE_CHANGED] =
  74                 g_signal_new ("page-changed",
  75                               EV_TYPE_PAGE_CACHE,
  76                               G_SIGNAL_RUN_LAST,
  77                               G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
  78                               NULL, NULL,
  79                               g_cclosure_marshal_VOID__INT,
  80                               G_TYPE_NONE, 1,
  81                               G_TYPE_INT);
  82
  83 }
  84
  85 static void
  86 ev_page_cache_finalize (GObject *object)
  87 {
  88         EvPageCache *page_cache;
  89
  90         page_cache = EV_PAGE_CACHE (object);
  91
  92         g_free (page_cache->title);
  93         g_free (page_cache->size_cache);
  94 }
  95
  96 EvPageCache *
  97 _ev_page_cache_new (EvDocument *document)
  98 {
  99         EvDocumentInfo *doc_info;
 100         EvPageCache *page_cache;
 101         EvPageCacheInfo *info;
 102         gint i;
 103
 104         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
 105
 106         ev_document_doc_mutex_lock ();
 107
 108         /* We read page information out of the document */
 109
 110         /* Assume all pages are the same size until proven otherwise */
 111         page_cache->uniform = TRUE;
 112         page_cache->has_labels = FALSE;
 113         page_cache->n_pages = ev_document_get_n_pages (document);
 114         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 115         page_cache->max_width_page_width = 0;
 116         page_cache->max_width_page_height = 0;
 117         page_cache->max_height_page_width = 0;
 118         page_cache->max_height_page_height = 0;
 119
 120         doc_info = ev_document_get_info (document);
 121         if (doc_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
 122                 page_cache->title = g_strdup (doc_info->title);
 123         } else {
 124                 page_cache->title = NULL;
 125         }
 126         g_free (doc_info);
 127
 128         for (i = 0; i < page_cache->n_pages; i++) {
 129                 double page_width = 0;
 130                 double page_height = 0;
 131
 132                 ev_document_get_page_size (document, i, &page_width, &page_height);
 133
 134                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 135
 136                 if (!page_cache->has_labels && page_cache->page_labels[i] != NULL) {
 137                         gchar *expected_label;
 138
 139                         expected_label = g_strdup_printf ("%d", i + 1);
 140                         if (strcmp (expected_label, page_cache->page_labels[i]))
 141                                 page_cache->has_labels = TRUE;
 142                         g_free (expected_label);
 143                 }
 144
 145                 if (page_width > page_cache->max_width_page_width) {
 146                         page_cache->max_width_page_width = page_width;
 147                         page_cache->max_width_page_height = page_height;
 148                 }
 149
 150                 if (page_height > page_cache->max_height_page_height) {
 151                         page_cache->max_height_page_width = page_width;
 152                         page_cache->max_height_page_height = page_height;
 153                 }
 154
 155                 if (i == 0) {
 156                         page_cache->uniform_width = page_width;
 157                         page_cache->uniform_height = page_height;
 158                 } else if (page_cache->uniform &&
 159                            (page_cache->uniform_width != page_width ||
 160                             page_cache->uniform_height != page_height)) {
 161                         /* It's a different page size.  Backfill the array. */
 162                         int j;
 163
 164                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 165
 166                         for (j = 0; j < i; j++) {
 167                                 info = &(page_cache->size_cache [j]);
 168                                 info->width = page_cache->uniform_width;
 169                                 info->height = page_cache->uniform_height;
 170                         }
 171                         page_cache->uniform = FALSE;
 172
 173                 }
 174
 175                 if (! page_cache->uniform) {
 176                         info = &(page_cache->size_cache [i]);
 177
 178                         info->width = page_width;
 179                         info->height = page_height;
 180                 }
 181         }
 182
 183         /* make some sanity check assertions */
 184         if (! page_cache->uniform)
 185                 g_assert (page_cache->size_cache != NULL);
 186         if (page_cache->uniform)
 187                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 188
 189         ev_document_doc_mutex_unlock ();
 190
 191         if (page_cache->n_pages > 0)
 192                 ev_page_cache_set_current_page (page_cache, 0);
 193
 194         return page_cache;
 195 }
 196
 197 gint
 198 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 199 {
 200         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 201
 202         return page_cache->n_pages;
 203 }
 204
 205 gint
 206 ev_page_cache_get_current_page (EvPageCache *page_cache)
 207 {
 208         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 209
 210         return page_cache->current_page;
 211 }
 212
 213 void
 214 ev_page_cache_set_current_page (EvPageCache *page_cache,
 215                                 int          page)
 216 {
 217         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 218         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 219
 220         if (page == page_cache->current_page)
 221                 return;
 222
 223         page_cache->current_page = page;
 224         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 225 }
 226
 227 gboolean
 228 ev_page_cache_set_page_label (EvPageCache *page_cache,
 229                               const char  *page_label)
 230 {
 231         gint i, page;
 232         long value;
 233         char *endptr = NULL;
 234
 235         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 236         g_return_val_if_fail (page_label != NULL, FALSE);
 237
 238         /* First, look for a literal label match */
 239         for (i = 0; i < page_cache->n_pages; i ++) {
 240                 if (page_cache->page_labels[i] != NULL &&
 241                     ! strcmp (page_label, page_cache->page_labels[i])) {
 242                         ev_page_cache_set_current_page (page_cache, i);
 243                         return TRUE;
 244                 }
 245         }
 246
 247         /* Next, parse the label, and see if the number fits */
 248         value = strtol (page_label, &endptr, 10);
 249         if (endptr[0] == '\0') {
 250                 /* Page number is an integer */
 251                 page = MIN (G_MAXINT, value);
 252
 253                 /* convert from a page label to a page offset */
 254                 page --;
 255                 if (page >= 0 &&
 256                     page < page_cache->n_pages &&
 257                     page_cache->page_labels[page] == NULL) {
 258                         ev_page_cache_set_current_page (page_cache, page);
 259                         return TRUE;
 260                 }
 261         }
 262
 263         return FALSE;
 264 }
 265
 266 void
 267 ev_page_cache_set_link (EvPageCache *page_cache,
 268                         EvLink      *link)
 269 {
 270         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 271         g_return_if_fail (EV_IS_LINK (link));
 272
 273         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 274 }
 275
 276 char *
 277 ev_page_cache_get_title (EvPageCache *page_cache)
 278 {
 279         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 280
 281         return page_cache->title;
 282 }
 283
 284 void
 285 ev_page_cache_get_size (EvPageCache *page_cache,
 286                         gint         page,
 287                         gfloat       scale,
 288                         gint        *width,
 289                         gint        *height)
 290 {
 291         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 292         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 293
 294         if (page_cache->uniform) {
 295                 if (width)
 296                         *width = page_cache->uniform_width;
 297                 if (height)
 298                         *height = page_cache->uniform_height;
 299         } else {
 300                 EvPageCacheInfo *info;
 301
 302                 info = &(page_cache->size_cache [page]);
 303
 304                 if (width)
 305                         *width = info->width;
 306                 if (height)
 307                         *height = info->height;
 308         }
 309
 310         if (width)
 311                 *width = (int) ((*width) * scale + 0.5);
 312         if (width)
 313                 *height = (int) ((*height) * scale + 0.5);
 314
 315 }
 316
 317
 318 /* Note that these aren't necessarily from the same page.
 319  */
 320 void
 321 ev_page_cache_get_max_width_size (EvPageCache *page_cache,
 322                                   gfloat       scale,
 323                                   gint        *width,
 324                                   gint        *height)
 325 {
 326         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 327
 328         if (width)
 329                 *width = page_cache->max_width_page_width * scale;
 330         if (height)
 331                 *height = page_cache->max_width_page_height * scale;
 332 }
 333
 334 void
 335 ev_page_cache_get_max_height_size (EvPageCache *page_cache,
 336                                    gfloat       scale,
 337                                    gint        *width,
 338                                    gint        *height)
 339 {
 340         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 341
 342         if (width)
 343                 *width = page_cache->max_height_page_width * scale;
 344         if (height)
 345                 *height = page_cache->max_height_page_height * scale;
 346 }
 347
 348
 349 gchar *
 350 ev_page_cache_get_page_label (EvPageCache *page_cache,
 351                               gint         page)
 352 {
 353         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 354         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 355
 356         if (page_cache->page_labels[page] == NULL)
 357                 return g_strdup_printf ("%d", page + 1);
 358
 359         return g_strdup (page_cache->page_labels[page]);
 360 }
 361
 362 gboolean
 363 ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
 364 {
 365         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 366         return page_cache->has_labels;
 367 }
 368
 369 gboolean
 370 ev_page_cache_next_page (EvPageCache *page_cache)
 371 {
 372         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 373
 374         if (page_cache->current_page >= page_cache->n_pages - 1)
 375                 return FALSE;
 376
 377         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 378         return TRUE;
 379
 380 }
 381
 382 gboolean
 383 ev_page_cache_prev_page (EvPageCache *page_cache)
 384 {
 385         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 386
 387         if (page_cache->current_page <= 0)
 388                 return FALSE;
 389
 390         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 391         return TRUE;
 392 }
 393