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