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         gint width;
   9         gint 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         gint uniform_width;
  25         gint 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 = 0;
  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         EvPageCache *page_cache;
  93         EvPageCacheInfo *info;
  94         gint i;
  95
  96         page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
  97
  98         g_mutex_lock (EV_DOC_MUTEX);
  99
 100         /* We read page information out of the document */
 101
 102         /* Assume all pages are the same size until proven otherwise */
 103         page_cache->uniform = TRUE;
 104         page_cache->n_pages = ev_document_get_n_pages (document);
 105         page_cache->title = ev_document_get_title (document);
 106         page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
 107
 108         ev_document_set_scale (document, 1.0);
 109         for (i = 0; i < page_cache->n_pages; i++) {
 110                 gint page_width = 0;
 111                 gint page_height = 0;
 112
 113                 ev_document_get_page_size (document, i, &page_width, &page_height);
 114                 page_cache->page_labels[i] = ev_document_get_page_label (document, i);
 115
 116                 if (i == 0) {
 117                         page_cache->uniform_width = page_width;
 118                         page_cache->uniform_height = page_height;
 119                 } else if (page_cache->uniform &&
 120                            (page_cache->uniform_width != page_width ||
 121                             page_cache->uniform_height != page_height)) {
 122                         /* It's a different page size.  Backfill the array. */
 123                         int j;
 124
 125                         page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
 126
 127                         for (j = 1; j < i; j++) {
 128                                 info = &(page_cache->size_cache [j - 1]);
 129                                 info->width = page_width;
 130                                 info->height = page_height;
 131                         }
 132                         page_cache->uniform = FALSE;
 133
 134                 }
 135
 136                 if (! page_cache->uniform) {
 137                         info = &(page_cache->size_cache [i - 1]);
 138
 139                         info->width = page_width;
 140                         info->height = page_height;
 141                 }
 142         }
 143
 144         /* make some sanity check assertions */
 145         g_assert (page_cache->n_pages > 0);
 146         if (! page_cache->uniform)
 147                 g_assert (page_cache->size_cache != NULL);
 148         if (page_cache->uniform)
 149                 g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
 150
 151         g_mutex_unlock (EV_DOC_MUTEX);
 152
 153         return page_cache;
 154 }
 155
 156 gint
 157 ev_page_cache_get_n_pages (EvPageCache *page_cache)
 158 {
 159         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 160
 161         return page_cache->n_pages;
 162 }
 163
 164 gint
 165 ev_page_cache_get_current_page (EvPageCache *page_cache)
 166 {
 167         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
 168
 169         return page_cache->current_page;
 170 }
 171
 172 void
 173 ev_page_cache_set_current_page (EvPageCache *page_cache,
 174                                 int          page)
 175 {
 176         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 177         g_return_if_fail (page >= 0 || page < page_cache->n_pages);
 178
 179         if (page == page_cache->current_page)
 180                 return;
 181
 182         page_cache->current_page = page;
 183         g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
 184 }
 185
 186 gboolean
 187 ev_page_cache_set_page_label (EvPageCache *page_cache,
 188                               const char  *page_label)
 189 {
 190         gint i, page;
 191         long value;
 192         char *endptr = NULL;
 193
 194         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 195         g_return_val_if_fail (page_label != NULL, FALSE);
 196
 197         /* First, look for a literal label match */
 198         for (i = 0; i < page_cache->n_pages; i ++) {
 199                 if (page_cache->page_labels[i] != NULL &&
 200                     ! strcmp (page_label, page_cache->page_labels[i])) {
 201                         ev_page_cache_set_current_page (page_cache, i);
 202                         return TRUE;
 203                 }
 204         }
 205
 206         /* Next, parse the label, and see if the number fits */
 207         value = strtol (page_label, &endptr, 10);
 208         if (endptr[0] == '\0') {
 209                 /* Page number is an integer */
 210                 page = MIN (G_MAXINT, value);
 211
 212                 /* convert from a page label to a page offset */
 213                 page --;
 214                 if (page >= 0 &&
 215                     page < page_cache->n_pages &&
 216                     page_cache->page_labels[page] == NULL) {
 217                         ev_page_cache_set_current_page (page_cache, page);
 218                         return TRUE;
 219                 }
 220         }
 221
 222         return FALSE;
 223 }
 224
 225 void
 226 ev_page_cache_set_link (EvPageCache *page_cache,
 227                         EvLink      *link)
 228 {
 229         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 230         g_return_if_fail (EV_IS_LINK (link));
 231
 232         ev_page_cache_set_current_page (page_cache, ev_link_get_page (link));
 233 }
 234
 235 char *
 236 ev_page_cache_get_title (EvPageCache *page_cache)
 237 {
 238         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 239
 240         return page_cache->title;
 241 }
 242
 243 void
 244 ev_page_cache_get_size (EvPageCache *page_cache,
 245                         gint         page,
 246                         gfloat       scale,
 247                         gint        *width,
 248                         gint        *height)
 249 {
 250         g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
 251         g_return_if_fail (page >= 0 && page < page_cache->n_pages);
 252
 253         if (page_cache->uniform) {
 254                 if (width)
 255                         *width = page_cache->uniform_width;
 256                 if (height)
 257                         *height = page_cache->uniform_height;
 258         } else {
 259                 EvPageCacheInfo *info;
 260
 261                 info = &(page_cache->size_cache [page]);
 262
 263                 if (width)
 264                         *width = info->width;
 265                 if (height)
 266                         *height = info->height;
 267         }
 268
 269         if (width)
 270                 *width = (*width) * scale;
 271         if (width)
 272                 *height = (*height) * scale;
 273
 274 }
 275 gchar *
 276 ev_page_cache_get_page_label (EvPageCache *page_cache,
 277                               gint         page)
 278 {
 279         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
 280         g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
 281
 282         if (page_cache->page_labels[page] == NULL)
 283                 return g_strdup_printf ("%d", page + 1);
 284
 285         return g_strdup (page_cache->page_labels[page]);
 286 }
 287
 288
 289 gboolean
 290 ev_page_cache_next_page (EvPageCache *page_cache)
 291 {
 292         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 293
 294         if (page_cache->current_page > page_cache->n_pages)
 295                 return FALSE;
 296
 297         ev_page_cache_set_current_page (page_cache, page_cache->current_page + 1);
 298         return TRUE;
 299
 300 }
 301
 302 gboolean
 303 ev_page_cache_prev_page (EvPageCache *page_cache)
 304 {
 305         g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
 306
 307         if (page_cache->current_page <= 0)
 308                 return FALSE;
 309
 310         ev_page_cache_set_current_page (page_cache, page_cache->current_page - 1);
 311         return TRUE;
 312 }
 313