shell/ev-pixbuf-cache.c

   1 #include "ev-pixbuf-cache.h"
   2 #include "ev-job-queue.h"
   3 #include "ev-page-cache.h"
   4 #include "ev-selection.h"
   5
   6 typedef struct _CacheJobInfo
   7 {
   8         EvJob *job;
   9         GdkPixbuf *pixbuf;
  10         EvRenderContext *rc;
  11         GList *link_mapping;
  12
  13         /* Selection info.  If the *_points structs are unset, we put -1 in x1.
  14          * selection_points are the coordinates encapsulated in selection.
  15          * new_points is the target selection size. */
  16         EvRectangle selection_points;
  17         GdkPixbuf *selection;
  18         EvRectangle new_points;
  19 } CacheJobInfo;
  20
  21 struct _EvPixbufCache
  22 {
  23         GObject parent;
  24
  25         EvDocument  *document;
  26         int start_page;
  27         int end_page;
  28
  29         /* preload_cache_size is the number of pages prior to the current
  30          * visible area that we cache.  It's normally 1, but could be 2 in the
  31          * case of twin pages.
  32          */
  33         int preload_cache_size;
  34         CacheJobInfo *prev_job;
  35         CacheJobInfo *job_list;
  36         CacheJobInfo *next_job;
  37 };
  38
  39 struct _EvPixbufCacheClass
  40 {
  41         GObjectClass parent_class;
  42
  43         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  44 };
  45
  46
  47 enum
  48 {
  49         JOB_FINISHED,
  50         N_SIGNALS,
  51 };
  52
  53 static guint signals[N_SIGNALS] = {0, };
  54
  55 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  56 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  57 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  58 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  59 static void          job_finished_cb            (EvJob              *job,
  60                                                  EvPixbufCache      *pixbuf_cache);
  61 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  62                                                  int                 page);
  63 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  64                                                  CacheJobInfo       *job_info,
  65                                                  EvPixbufCache      *pixbuf_cache);
  66 static gboolean      new_selection_pixbuf_needed(EvPixbufCache *pixbuf_cache,
  67                                                  CacheJobInfo  *job_info,
  68                                                  gint           page,
  69                                                  gfloat         scale);
  70
  71
  72 /* These are used for iterating through the prev and next arrays */
  73 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  74         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  75 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  76         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  77 #define PAGE_CACHE_LEN(pixbuf_cache) \
  78         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  79
  80 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  81
  82 static void
  83 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  84 {
  85         pixbuf_cache->start_page = 0;
  86         pixbuf_cache->end_page = 0;
  87         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
  88
  89         pixbuf_cache->preload_cache_size = 2;
  90         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  91         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  92 }
  93
  94 static void
  95 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
  96 {
  97         GObjectClass *object_class;
  98
  99         object_class = G_OBJECT_CLASS (class);
 100
 101         object_class->finalize = ev_pixbuf_cache_finalize;
 102         object_class->dispose = ev_pixbuf_cache_dispose;
 103
 104         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 105                                             G_OBJECT_CLASS_TYPE (object_class),
 106                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 107                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 108                                             NULL, NULL,
 109                                             g_cclosure_marshal_VOID__VOID,
 110                                             G_TYPE_NONE, 0);
 111 }
 112
 113 static void
 114 ev_pixbuf_cache_finalize (GObject *object)
 115 {
 116         EvPixbufCache *pixbuf_cache;
 117
 118         pixbuf_cache = EV_PIXBUF_CACHE (object);
 119
 120         g_free (pixbuf_cache->prev_job);
 121         g_free (pixbuf_cache->job_list);
 122         g_free (pixbuf_cache->next_job);
 123 }
 124
 125 static void
 126 dispose_cache_job_info (CacheJobInfo *job_info,
 127                         gpointer      data)
 128 {
 129         if (job_info == NULL)
 130                 return;
 131         if (job_info->job) {
 132                 g_signal_handlers_disconnect_by_func (job_info->job,
 133                                                       G_CALLBACK (job_finished_cb),
 134                                                       data);
 135                 ev_job_queue_remove_job (job_info->job);
 136                 g_object_unref (G_OBJECT (job_info->job));
 137                 job_info->job = NULL;
 138         }
 139         if (job_info->pixbuf) {
 140                 g_object_unref (G_OBJECT (job_info->pixbuf));
 141                 job_info->pixbuf = NULL;
 142         }
 143         if (job_info->link_mapping) {
 144                 ev_link_mapping_free (job_info->link_mapping);
 145                 job_info->link_mapping = NULL;
 146         }
 147         if (job_info->selection) {
 148                 g_object_unref (G_OBJECT (job_info->selection));
 149                 job_info->selection = NULL;
 150         }
 151
 152         job_info->selection_points.x1 = -1;
 153         job_info->new_points.x1 = -1;
 154 }
 155
 156 static void
 157 ev_pixbuf_cache_dispose (GObject *object)
 158 {
 159         EvPixbufCache *pixbuf_cache;
 160         int i;
 161
 162         pixbuf_cache = EV_PIXBUF_CACHE (object);
 163
 164         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 165                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 166                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 167         }
 168
 169         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 170                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 171         }
 172 }
 173
 174
 175 EvPixbufCache *
 176 ev_pixbuf_cache_new (EvDocument *document)
 177 {
 178         EvPixbufCache *pixbuf_cache;
 179
 180         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 181         pixbuf_cache->document = document;
 182
 183         return pixbuf_cache;
 184 }
 185
 186 static void
 187 job_finished_cb (EvJob         *job,
 188                  EvPixbufCache *pixbuf_cache)
 189 {
 190         CacheJobInfo *job_info;
 191         EvJobRender *job_render = EV_JOB_RENDER (job);
 192         GdkPixbuf *pixbuf;
 193
 194         /* If the job is outside of our interest, we silently discard it */
 195         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 196             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 197                 g_object_unref (job);
 198                 return;
 199         }
 200
 201         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 202
 203         pixbuf = g_object_ref (job_render->pixbuf);
 204         if (job_info->pixbuf)
 205                 g_object_unref (job_info->pixbuf);
 206         job_info->pixbuf = pixbuf;
 207
 208         if (job_render->link_mapping) {
 209                 if (job_info->link_mapping)
 210                         ev_link_mapping_free (job_info->link_mapping);
 211                 job_info->link_mapping = job_render->link_mapping;
 212         }
 213         if (job_render->include_selection) {
 214                 if (job_info->selection)
 215                         g_object_unref (job_info->selection);
 216                 job_info->selection_points = job_render->selection_points;
 217                 job_info->selection = job_render->selection;
 218                 g_assert (job_info->selection_points.x1 >= 0);
 219         }
 220
 221         if (job_info->job == job)
 222                 job_info->job = NULL;
 223         g_object_unref (job);
 224
 225         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 226 }
 227
 228 /* This checks a job to see if the job would generate the right sized pixbuf
 229  * given a scale.  If it won't, it removes the job and clears it to NULL.
 230  */
 231 static void
 232 check_job_size_and_unref (CacheJobInfo *job_info,
 233                           EvPageCache  *page_cache,
 234                           gfloat        scale)
 235 {
 236         gint width;
 237         gint height;
 238
 239         g_assert (job_info);
 240
 241         if (job_info->job == NULL)
 242                 return;
 243
 244         ev_page_cache_get_size (page_cache,
 245                                 EV_JOB_RENDER (job_info->job)->rc->page,
 246                                 scale,
 247                                 &width, &height);
 248
 249         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 250             height == EV_JOB_RENDER (job_info->job)->target_height)
 251                 return;
 252
 253         /* Try to remove the job.  If we can't, then the thread has already
 254          * picked it up and we are going get a signal when it's done.  If we
 255          * can, then the job is fully dead and will never rnu.. */
 256         if (ev_job_queue_remove_job (job_info->job))
 257                 g_object_unref (job_info->job);
 258
 259         job_info->job = NULL;
 260 }
 261
 262 /* Do all function that copies a job from an older cache to it's position in the
 263  * new cache.  It clears the old job if it doesn't have a place.
 264  */
 265 static void
 266 move_one_job (CacheJobInfo  *job_info,
 267               EvPixbufCache *pixbuf_cache,
 268               int            page,
 269               CacheJobInfo  *new_job_list,
 270               CacheJobInfo  *new_prev_job,
 271               CacheJobInfo  *new_next_job,
 272               int            start_page,
 273               int            end_page,
 274               EvJobPriority  priority)
 275 {
 276         CacheJobInfo *target_page = NULL;
 277         int page_offset;
 278         EvJobPriority new_priority;
 279
 280         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 281             page > (end_page + pixbuf_cache->preload_cache_size)) {
 282                 dispose_cache_job_info (job_info, pixbuf_cache);
 283                 return;
 284         }
 285
 286         /* find the target page to copy it over to. */
 287         if (page < start_page) {
 288                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 289
 290                 g_assert (page_offset >= 0 &&
 291                           page_offset < pixbuf_cache->preload_cache_size);
 292                 target_page = new_prev_job + page_offset;
 293                 new_priority = EV_JOB_PRIORITY_LOW;
 294         } else if (page > end_page) {
 295                 page_offset = (page - (end_page + 1));
 296
 297                 g_assert (page_offset >= 0 &&
 298                           page_offset < pixbuf_cache->preload_cache_size);
 299                 target_page = new_next_job + page_offset;
 300                 new_priority = EV_JOB_PRIORITY_LOW;
 301         } else {
 302                 page_offset = page - start_page;
 303                 g_assert (page_offset >= 0 &&
 304                           page_offset <= ((end_page - start_page) + 1));
 305                 new_priority = EV_JOB_PRIORITY_HIGH;
 306                 target_page = new_job_list + page_offset;
 307         }
 308
 309         *target_page = *job_info;
 310         job_info->job = NULL;
 311         job_info->pixbuf = NULL;
 312         job_info->link_mapping = NULL;
 313
 314         if (new_priority != priority && target_page->job) {
 315                 ev_job_queue_update_job (target_page->job, new_priority);
 316         }
 317 }
 318
 319
 320
 321 static void
 322 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 323                               gint           start_page,
 324                               gint           end_page)
 325 {
 326         CacheJobInfo *new_job_list;
 327         CacheJobInfo *new_prev_job;
 328         CacheJobInfo *new_next_job;
 329         EvPageCache *page_cache;
 330         int i, page;
 331
 332         if (pixbuf_cache->start_page == start_page &&
 333             pixbuf_cache->end_page == end_page)
 334                 return;
 335
 336         page_cache = ev_page_cache_get (pixbuf_cache->document);
 337
 338         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 339         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 340         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 341
 342         /* We go through each job in the old cache and either clear it or move
 343          * it to a new location. */
 344
 345         /* Start with the prev cache. */
 346         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 347         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 348                 if (page < 0) {
 349                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 350                 } else {
 351                         move_one_job (pixbuf_cache->prev_job + i,
 352                                       pixbuf_cache, page,
 353                                       new_job_list, new_prev_job, new_next_job,
 354                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 355                 }
 356                 page ++;
 357         }
 358
 359         page = pixbuf_cache->start_page;
 360         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 361                 move_one_job (pixbuf_cache->job_list + i,
 362                               pixbuf_cache, page,
 363                               new_job_list, new_prev_job, new_next_job,
 364                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 365                 page ++;
 366         }
 367
 368         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 369                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 370                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 371                 } else {
 372                         move_one_job (pixbuf_cache->next_job + i,
 373                                       pixbuf_cache, page,
 374                                       new_job_list, new_prev_job, new_next_job,
 375                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 376                 }
 377                 page ++;
 378         }
 379
 380         g_free (pixbuf_cache->job_list);
 381         g_free (pixbuf_cache->prev_job);
 382         g_free (pixbuf_cache->next_job);
 383
 384         pixbuf_cache->job_list = new_job_list;
 385         pixbuf_cache->prev_job = new_prev_job;
 386         pixbuf_cache->next_job = new_next_job;
 387
 388         pixbuf_cache->start_page = start_page;
 389         pixbuf_cache->end_page = end_page;
 390 }
 391
 392 static void
 393 copy_job_to_job_info (EvJobRender   *job_render,
 394                       CacheJobInfo  *job_info,
 395                       EvPixbufCache *pixbuf_cache)
 396 {
 397         GdkPixbuf *pixbuf;
 398
 399         pixbuf = g_object_ref (job_render->pixbuf);
 400
 401         dispose_cache_job_info (job_info, pixbuf_cache);
 402
 403         job_info->pixbuf = pixbuf;
 404         if (job_render->link_mapping)
 405                 job_info->link_mapping = job_render->link_mapping;
 406 }
 407
 408 static CacheJobInfo *
 409 find_job_cache (EvPixbufCache *pixbuf_cache,
 410                 int            page)
 411 {
 412         int page_offset;
 413
 414         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 415             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 416                 return NULL;
 417
 418         if (page < pixbuf_cache->start_page) {
 419                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 420
 421                 g_assert (page_offset >= 0 &&
 422                           page_offset < pixbuf_cache->preload_cache_size);
 423                 return pixbuf_cache->prev_job + page_offset;
 424         }
 425
 426         if (page > pixbuf_cache->end_page) {
 427                 page_offset = (page - (pixbuf_cache->end_page + 1));
 428
 429                 g_assert (page_offset >= 0 &&
 430                           page_offset < pixbuf_cache->preload_cache_size);
 431                 return pixbuf_cache->next_job + page_offset;
 432         }
 433
 434         page_offset = page - pixbuf_cache->start_page;
 435         g_assert (page_offset >= 0 &&
 436                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 437         return pixbuf_cache->job_list + page_offset;
 438 }
 439
 440 static void
 441 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 442                                  gfloat         scale)
 443 {
 444         EvPageCache *page_cache;
 445         int i;
 446
 447         page_cache = ev_page_cache_get (pixbuf_cache->document);
 448
 449         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 450                 check_job_size_and_unref (pixbuf_cache->job_list + i, page_cache, scale);
 451         }
 452
 453         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 454                 check_job_size_and_unref (pixbuf_cache->prev_job + i, page_cache, scale);
 455                 check_job_size_and_unref (pixbuf_cache->next_job + i, page_cache, scale);
 456         }
 457 }
 458
 459 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 460         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 461
 462 static void
 463 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 464                    CacheJobInfo  *job_info,
 465                    EvPageCache   *page_cache,
 466                    gint           page,
 467                    gfloat         scale,
 468                    EvJobPriority  priority)
 469 {
 470         gboolean include_links = FALSE;
 471         gboolean include_selection = FALSE;
 472         int width, height;
 473
 474         if (job_info->job)
 475                 return;
 476
 477         ev_page_cache_get_size (page_cache,
 478                                 page, scale,
 479                                 &width, &height);
 480
 481         if (job_info->pixbuf &&
 482             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 483             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 484                 return;
 485
 486         /* make a new job now */
 487         if (job_info->rc == NULL) {
 488                 job_info->rc = ev_render_context_new (EV_ORIENTATION_PORTRAIT,
 489                                                       page, scale);
 490         } else {
 491                 ev_render_context_set_page (job_info->rc, page);
 492                 ev_render_context_set_scale (job_info->rc, scale);
 493         }
 494
 495         /* Figure out what else we need for this job */
 496         if (job_info->link_mapping == NULL)
 497                 include_links = TRUE;
 498         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 499                 include_selection = TRUE;
 500         }
 501
 502         job_info->job = ev_job_render_new (pixbuf_cache->document,
 503                                            job_info->rc,
 504                                            width, height,
 505                                            &(job_info->new_points),
 506                                            include_links,
 507                                            include_selection);
 508         ev_job_queue_add_job (job_info->job, priority);
 509         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 510 }
 511
 512
 513 static void
 514 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 515                                     gfloat         scale)
 516 {
 517         EvPageCache *page_cache;
 518         CacheJobInfo *job_info;
 519         int page;
 520         int i;
 521
 522         page_cache = ev_page_cache_get (pixbuf_cache->document);
 523
 524         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 525                 job_info = (pixbuf_cache->job_list + i);
 526                 page = pixbuf_cache->start_page + i;
 527
 528                 add_job_if_needed (pixbuf_cache, job_info,
 529                                    page_cache, page, scale,
 530                                    EV_JOB_PRIORITY_HIGH);
 531         }
 532
 533         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 534                 job_info = (pixbuf_cache->prev_job + i);
 535                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 536
 537                 add_job_if_needed (pixbuf_cache, job_info,
 538                                    page_cache, page, scale,
 539                                    EV_JOB_PRIORITY_LOW);
 540         }
 541
 542         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 543                 job_info = (pixbuf_cache->next_job + i);
 544                 page = pixbuf_cache->end_page + 1 + i;
 545
 546                 add_job_if_needed (pixbuf_cache, job_info,
 547                                    page_cache, page, scale,
 548                                    EV_JOB_PRIORITY_LOW);
 549         }
 550
 551 }
 552
 553 void
 554 ev_pixbuf_cache_set_page_range (EvPixbufCache *pixbuf_cache,
 555                                 gint           start_page,
 556                                 gint           end_page,
 557                                 gfloat         scale,
 558                                 GList          *selection_list)
 559 {
 560         EvPageCache *page_cache;
 561
 562         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 563
 564         page_cache = ev_page_cache_get (pixbuf_cache->document);
 565
 566         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 567         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 568         g_return_if_fail (end_page >= start_page);
 569
 570         /* First, resize the page_range as needed.  We cull old pages
 571          * mercilessly. */
 572         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 573
 574         /* Then, we update the current jobs to see if any of them are the wrong
 575          * size, we remove them if we need to. */
 576         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 577
 578         /* Next, we update the target selection for our pages */
 579         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 580
 581         /* Finally, we add the new jobs for all the sizes that don't have a
 582          * pixbuf */
 583         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, scale);
 584 }
 585
 586 GdkPixbuf *
 587 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 588                             gint           page)
 589 {
 590         CacheJobInfo *job_info;
 591
 592         job_info = find_job_cache (pixbuf_cache, page);
 593         if (job_info == NULL)
 594                 return NULL;
 595
 596         /* We don't need to wait for the idle to handle the callback */
 597         if (job_info->job &&
 598             EV_JOB (job_info->job)->finished) {
 599                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 600         }
 601
 602         return job_info->pixbuf;
 603 }
 604
 605 GList *
 606 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 607                                   gint           page)
 608 {
 609         CacheJobInfo *job_info;
 610
 611         job_info = find_job_cache (pixbuf_cache, page);
 612         if (job_info == NULL)
 613                 return NULL;
 614
 615         /* We don't need to wait for the idle to handle the callback */
 616         if (job_info->job &&
 617             EV_JOB (job_info->job)->finished) {
 618                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 619         }
 620
 621         return job_info->link_mapping;
 622 }
 623
 624 /* Selection */
 625 static gboolean
 626 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 627                              CacheJobInfo  *job_info,
 628                              gint           page,
 629                              gfloat         scale)
 630 {
 631         EvPageCache *page_cache;
 632         gint width, height;
 633
 634         if (job_info->selection) {
 635                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 636                 ev_page_cache_get_size (page_cache, page, scale,
 637                                         &width, &height);
 638
 639                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 640                     height != gdk_pixbuf_get_height (job_info->selection))
 641                         return TRUE;
 642         } else {
 643                 if (job_info->new_points.x1 >= 0)
 644                         return TRUE;
 645         }
 646         return FALSE;
 647 }
 648
 649 static void
 650 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 651                            CacheJobInfo  *job_info,
 652                            gint           page,
 653                            gfloat         scale)
 654 {
 655         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 656                 if (job_info->selection)
 657                         g_object_unref (job_info->selection);
 658                 job_info->selection = NULL;
 659                 job_info->selection_points.x1 = -1;
 660         }
 661 }
 662
 663 GList *
 664 ev_pixbuf_cach_get_text_mapping      (EvPixbufCache *pixbuf_cache,
 665                                       gint           page)
 666 {
 667         return NULL;
 668 }
 669
 670 GdkPixbuf *
 671 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache *pixbuf_cache,
 672                                       gint           page,
 673                                       gfloat         scale)
 674 {
 675         CacheJobInfo *job_info;
 676
 677         job_info = find_job_cache (pixbuf_cache, page);
 678         if (job_info == NULL)
 679                 return NULL;
 680
 681         /* No selection on this page */
 682         if (job_info->new_points.x1 < 0)
 683                 return NULL;
 684
 685         /* If we have a running job, we just return what we have under the
 686          * assumption that it'll be updated later and we can scale it as need
 687          * be */
 688         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 689                 return job_info->selection;
 690
 691         /* Now, lets see if we need to resize the image.  If we do, we clear the
 692          * old one. */
 693         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 694
 695         /* Finally, we see if the two scales are the same, and get a new pixbuf
 696          * if needed.  We do this synchronously for now.  At some point, we
 697          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 698          * doesn't kill us.  Rendering a few glyphs should really be fast.
 699          */
 700         if (ev_rect_cmp (&(job_info->new_points), &(job_info->selection_points))) {
 701                 EvRenderContext *rc;
 702
 703                 rc = ev_render_context_new (EV_ORIENTATION_PORTRAIT,
 704                                             page,
 705                                             scale);
 706
 707                 /* we need to get a new selection pixbuf */
 708                 ev_document_doc_mutex_lock ();
 709                 if (job_info->selection_points.x1 < 0) {
 710                         g_assert (job_info->selection == NULL);
 711                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 712                                                        rc, &(job_info->selection),
 713                                                        &(job_info->new_points),
 714                                                        NULL);
 715                 } else {
 716                         g_assert (job_info->selection != NULL);
 717                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 718                                                        rc, &(job_info->selection),
 719                                                        &(job_info->new_points),
 720                                                        &(job_info->selection_points));
 721                 }
 722                 job_info->selection_points = job_info->new_points;
 723                 ev_document_doc_mutex_unlock ();
 724
 725         }
 726         return job_info->selection;
 727 }
 728
 729
 730 static void
 731 update_job_selection (CacheJobInfo    *job_info,
 732                       EvViewSelection *selection)
 733 {
 734         if (job_info->selection == NULL)
 735                 job_info->selection_points.x1 = -1;
 736         job_info->new_points = selection->rect;
 737 }
 738
 739 static void
 740 clear_job_selection (CacheJobInfo *job_info)
 741 {
 742         job_info->selection_points.x1 = -1;
 743         job_info->new_points.x1 = -1;
 744
 745         if (job_info->selection) {
 746                 g_object_unref (job_info->selection);
 747                 job_info->selection = NULL;
 748         }
 749 }
 750
 751 /* This function will reset the selection on pages that no longer have them, and
 752  * will update the target_selection on those that need it.
 753  */
 754 void
 755 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 756                                     GList         *selection_list)
 757 {
 758         EvPageCache *page_cache;
 759         EvViewSelection *selection;
 760         GList *list = selection_list;
 761         int page;
 762         int i;
 763
 764         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 765
 766         page_cache = ev_page_cache_get (pixbuf_cache->document);
 767
 768         /* We check each area to see what needs updating, and what needs freeing; */
 769         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 770         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 771                 if (page < 0) {
 772                         page ++;
 773                         continue;
 774                 }
 775
 776                 selection = NULL;
 777                 while (list) {
 778                         if (((EvViewSelection *)list->data)->page == page) {
 779                                 selection = list->data;
 780                                 break;
 781                         } else if (((EvViewSelection *)list->data)->page > page)
 782                                 break;
 783                         list = list->next;
 784                 }
 785
 786                 if (selection)
 787                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 788                 else
 789                         clear_job_selection (pixbuf_cache->prev_job + i);
 790                 page ++;
 791         }
 792
 793         page = pixbuf_cache->start_page;
 794         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 795                 selection = NULL;
 796                 while (list) {
 797                         if (((EvViewSelection *)list->data)->page == page) {
 798                                 selection = list->data;
 799                                 break;
 800                         } else if (((EvViewSelection *)list->data)->page > page)
 801                                 break;
 802                         list = list->next;
 803                 }
 804
 805                 if (selection)
 806                         update_job_selection (pixbuf_cache->job_list + i, selection);
 807                 else
 808                         clear_job_selection (pixbuf_cache->job_list + i);
 809                 page ++;
 810         }
 811
 812         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 813                 if (page >= ev_page_cache_get_n_pages (page_cache))
 814                         break;
 815
 816                 selection = NULL;
 817                 while (list) {
 818                         if (((EvViewSelection *)list->data)->page == page) {
 819                                 selection = list->data;
 820                                 break;
 821                         } else if (((EvViewSelection *)list->data)->page > page)
 822                                 break;
 823                         list = list->next;
 824                 }
 825
 826                 if (selection)
 827                         update_job_selection (pixbuf_cache->next_job + i, selection);
 828                 else
 829                         clear_job_selection (pixbuf_cache->next_job + i);
 830                 page ++;
 831         }
 832 }