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         GdkRegion *text_mapping;
  13
  14         /* Selection info.  If the *_points structs are unset, we put -1 in x1.
  15          * selection_points are the coordinates encapsulated in selection.
  16          * new_points is the target selection size. */
  17         EvRectangle selection_points;
  18         GdkPixbuf *selection;
  19         EvRectangle new_points;
  20 } CacheJobInfo;
  21
  22 struct _EvPixbufCache
  23 {
  24         GObject parent;
  25
  26         EvDocument  *document;
  27         int start_page;
  28         int end_page;
  29
  30         /* preload_cache_size is the number of pages prior to the current
  31          * visible area that we cache.  It's normally 1, but could be 2 in the
  32          * case of twin pages.
  33          */
  34         int preload_cache_size;
  35         CacheJobInfo *prev_job;
  36         CacheJobInfo *job_list;
  37         CacheJobInfo *next_job;
  38 };
  39
  40 struct _EvPixbufCacheClass
  41 {
  42         GObjectClass parent_class;
  43
  44         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  45 };
  46
  47
  48 enum
  49 {
  50         JOB_FINISHED,
  51         N_SIGNALS,
  52 };
  53
  54 static guint signals[N_SIGNALS] = {0, };
  55
  56 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  57 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  58 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  59 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  60 static void          job_finished_cb            (EvJob              *job,
  61                                                  EvPixbufCache      *pixbuf_cache);
  62 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  63                                                  int                 page);
  64 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  65                                                  CacheJobInfo       *job_info,
  66                                                  EvPixbufCache      *pixbuf_cache);
  67 static gboolean      new_selection_pixbuf_needed(EvPixbufCache *pixbuf_cache,
  68                                                  CacheJobInfo  *job_info,
  69                                                  gint           page,
  70                                                  gfloat         scale);
  71
  72
  73 /* These are used for iterating through the prev and next arrays */
  74 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  75         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  76 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  77         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  78 #define PAGE_CACHE_LEN(pixbuf_cache) \
  79         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  80
  81 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  82
  83 static void
  84 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  85 {
  86         pixbuf_cache->start_page = 0;
  87         pixbuf_cache->end_page = 0;
  88         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
  89
  90         pixbuf_cache->preload_cache_size = 2;
  91         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  92         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  93 }
  94
  95 static void
  96 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
  97 {
  98         GObjectClass *object_class;
  99
 100         object_class = G_OBJECT_CLASS (class);
 101
 102         object_class->finalize = ev_pixbuf_cache_finalize;
 103         object_class->dispose = ev_pixbuf_cache_dispose;
 104
 105         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 106                                             G_OBJECT_CLASS_TYPE (object_class),
 107                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 108                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 109                                             NULL, NULL,
 110                                             g_cclosure_marshal_VOID__VOID,
 111                                             G_TYPE_NONE, 0);
 112 }
 113
 114 static void
 115 ev_pixbuf_cache_finalize (GObject *object)
 116 {
 117         EvPixbufCache *pixbuf_cache;
 118
 119         pixbuf_cache = EV_PIXBUF_CACHE (object);
 120
 121         g_free (pixbuf_cache->prev_job);
 122         g_free (pixbuf_cache->job_list);
 123         g_free (pixbuf_cache->next_job);
 124 }
 125
 126 static void
 127 dispose_cache_job_info (CacheJobInfo *job_info,
 128                         gpointer      data)
 129 {
 130         if (job_info == NULL)
 131                 return;
 132         if (job_info->job) {
 133                 g_signal_handlers_disconnect_by_func (job_info->job,
 134                                                       G_CALLBACK (job_finished_cb),
 135                                                       data);
 136                 ev_job_queue_remove_job (job_info->job);
 137                 g_object_unref (G_OBJECT (job_info->job));
 138                 job_info->job = NULL;
 139         }
 140         if (job_info->pixbuf) {
 141                 g_object_unref (G_OBJECT (job_info->pixbuf));
 142                 job_info->pixbuf = NULL;
 143         }
 144         if (job_info->link_mapping) {
 145                 ev_link_mapping_free (job_info->link_mapping);
 146                 job_info->link_mapping = NULL;
 147         }
 148         if (job_info->text_mapping) {
 149                 gdk_region_destroy (job_info->text_mapping);
 150                 job_info->text_mapping = NULL;
 151         }
 152         if (job_info->selection) {
 153                 g_object_unref (G_OBJECT (job_info->selection));
 154                 job_info->selection = NULL;
 155         }
 156
 157         job_info->selection_points.x1 = -1;
 158         job_info->new_points.x1 = -1;
 159 }
 160
 161 static void
 162 ev_pixbuf_cache_dispose (GObject *object)
 163 {
 164         EvPixbufCache *pixbuf_cache;
 165         int i;
 166
 167         pixbuf_cache = EV_PIXBUF_CACHE (object);
 168
 169         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 170                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 171                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 172         }
 173
 174         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 175                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 176         }
 177 }
 178
 179
 180 EvPixbufCache *
 181 ev_pixbuf_cache_new (EvDocument *document)
 182 {
 183         EvPixbufCache *pixbuf_cache;
 184
 185         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 186         pixbuf_cache->document = document;
 187
 188         return pixbuf_cache;
 189 }
 190
 191 static void
 192 job_finished_cb (EvJob         *job,
 193                  EvPixbufCache *pixbuf_cache)
 194 {
 195         CacheJobInfo *job_info;
 196         EvJobRender *job_render = EV_JOB_RENDER (job);
 197         GdkPixbuf *pixbuf;
 198
 199         /* If the job is outside of our interest, we silently discard it */
 200         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 201             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 202                 g_object_unref (job);
 203                 return;
 204         }
 205
 206         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 207
 208         pixbuf = g_object_ref (job_render->pixbuf);
 209         if (job_info->pixbuf)
 210                 g_object_unref (job_info->pixbuf);
 211         job_info->pixbuf = pixbuf;
 212
 213         if (job_render->link_mapping) {
 214                 if (job_info->link_mapping)
 215                         ev_link_mapping_free (job_info->link_mapping);
 216                 job_info->link_mapping = job_render->link_mapping;
 217         }
 218
 219         if (job_render->text_mapping) {
 220                 if (job_info->text_mapping)
 221                         gdk_region_destroy (job_info->text_mapping);
 222                 job_info->text_mapping = job_render->text_mapping;
 223         }
 224
 225         if (job_render->include_selection) {
 226                 if (job_info->selection)
 227                         g_object_unref (job_info->selection);
 228                 job_info->selection_points = job_render->selection_points;
 229                 job_info->selection = job_render->selection;
 230                 g_assert (job_info->selection_points.x1 >= 0);
 231         }
 232
 233         if (job_info->job == job)
 234                 job_info->job = NULL;
 235         g_object_unref (job);
 236
 237         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 238 }
 239
 240 /* This checks a job to see if the job would generate the right sized pixbuf
 241  * given a scale.  If it won't, it removes the job and clears it to NULL.
 242  */
 243 static void
 244 check_job_size_and_unref (CacheJobInfo *job_info,
 245                           EvPageCache  *page_cache,
 246                           gfloat        scale)
 247 {
 248         gint width;
 249         gint height;
 250
 251         g_assert (job_info);
 252
 253         if (job_info->job == NULL)
 254                 return;
 255
 256         ev_page_cache_get_size (page_cache,
 257                                 EV_JOB_RENDER (job_info->job)->rc->page,
 258                                 scale,
 259                                 &width, &height);
 260
 261         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 262             height == EV_JOB_RENDER (job_info->job)->target_height)
 263                 return;
 264
 265         /* Try to remove the job.  If we can't, then the thread has already
 266          * picked it up and we are going get a signal when it's done.  If we
 267          * can, then the job is fully dead and will never rnu.. */
 268         if (ev_job_queue_remove_job (job_info->job))
 269                 g_object_unref (job_info->job);
 270
 271         job_info->job = NULL;
 272 }
 273
 274 /* Do all function that copies a job from an older cache to it's position in the
 275  * new cache.  It clears the old job if it doesn't have a place.
 276  */
 277 static void
 278 move_one_job (CacheJobInfo  *job_info,
 279               EvPixbufCache *pixbuf_cache,
 280               int            page,
 281               CacheJobInfo  *new_job_list,
 282               CacheJobInfo  *new_prev_job,
 283               CacheJobInfo  *new_next_job,
 284               int            start_page,
 285               int            end_page,
 286               EvJobPriority  priority)
 287 {
 288         CacheJobInfo *target_page = NULL;
 289         int page_offset;
 290         EvJobPriority new_priority;
 291
 292         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 293             page > (end_page + pixbuf_cache->preload_cache_size)) {
 294                 dispose_cache_job_info (job_info, pixbuf_cache);
 295                 return;
 296         }
 297
 298         /* find the target page to copy it over to. */
 299         if (page < start_page) {
 300                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 301
 302                 g_assert (page_offset >= 0 &&
 303                           page_offset < pixbuf_cache->preload_cache_size);
 304                 target_page = new_prev_job + page_offset;
 305                 new_priority = EV_JOB_PRIORITY_LOW;
 306         } else if (page > end_page) {
 307                 page_offset = (page - (end_page + 1));
 308
 309                 g_assert (page_offset >= 0 &&
 310                           page_offset < pixbuf_cache->preload_cache_size);
 311                 target_page = new_next_job + page_offset;
 312                 new_priority = EV_JOB_PRIORITY_LOW;
 313         } else {
 314                 page_offset = page - start_page;
 315                 g_assert (page_offset >= 0 &&
 316                           page_offset <= ((end_page - start_page) + 1));
 317                 new_priority = EV_JOB_PRIORITY_HIGH;
 318                 target_page = new_job_list + page_offset;
 319         }
 320
 321         *target_page = *job_info;
 322         job_info->job = NULL;
 323         job_info->pixbuf = NULL;
 324         job_info->link_mapping = NULL;
 325
 326         if (new_priority != priority && target_page->job) {
 327                 ev_job_queue_update_job (target_page->job, new_priority);
 328         }
 329 }
 330
 331
 332
 333 static void
 334 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 335                               gint           start_page,
 336                               gint           end_page)
 337 {
 338         CacheJobInfo *new_job_list;
 339         CacheJobInfo *new_prev_job;
 340         CacheJobInfo *new_next_job;
 341         EvPageCache *page_cache;
 342         int i, page;
 343
 344         if (pixbuf_cache->start_page == start_page &&
 345             pixbuf_cache->end_page == end_page)
 346                 return;
 347
 348         page_cache = ev_page_cache_get (pixbuf_cache->document);
 349
 350         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 351         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 352         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 353
 354         /* We go through each job in the old cache and either clear it or move
 355          * it to a new location. */
 356
 357         /* Start with the prev cache. */
 358         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 359         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 360                 if (page < 0) {
 361                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 362                 } else {
 363                         move_one_job (pixbuf_cache->prev_job + i,
 364                                       pixbuf_cache, page,
 365                                       new_job_list, new_prev_job, new_next_job,
 366                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 367                 }
 368                 page ++;
 369         }
 370
 371         page = pixbuf_cache->start_page;
 372         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 373                 move_one_job (pixbuf_cache->job_list + i,
 374                               pixbuf_cache, page,
 375                               new_job_list, new_prev_job, new_next_job,
 376                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 377                 page ++;
 378         }
 379
 380         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 381                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 382                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 383                 } else {
 384                         move_one_job (pixbuf_cache->next_job + i,
 385                                       pixbuf_cache, page,
 386                                       new_job_list, new_prev_job, new_next_job,
 387                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 388                 }
 389                 page ++;
 390         }
 391
 392         g_free (pixbuf_cache->job_list);
 393         g_free (pixbuf_cache->prev_job);
 394         g_free (pixbuf_cache->next_job);
 395
 396         pixbuf_cache->job_list = new_job_list;
 397         pixbuf_cache->prev_job = new_prev_job;
 398         pixbuf_cache->next_job = new_next_job;
 399
 400         pixbuf_cache->start_page = start_page;
 401         pixbuf_cache->end_page = end_page;
 402 }
 403
 404 static void
 405 copy_job_to_job_info (EvJobRender   *job_render,
 406                       CacheJobInfo  *job_info,
 407                       EvPixbufCache *pixbuf_cache)
 408 {
 409         GdkPixbuf *pixbuf;
 410
 411         pixbuf = g_object_ref (job_render->pixbuf);
 412
 413         dispose_cache_job_info (job_info, pixbuf_cache);
 414
 415         job_info->pixbuf = pixbuf;
 416         if (job_render->link_mapping)
 417                 job_info->link_mapping = job_render->link_mapping;
 418         if (job_render->text_mapping)
 419                 job_info->text_mapping = job_render->text_mapping;
 420 }
 421
 422 static CacheJobInfo *
 423 find_job_cache (EvPixbufCache *pixbuf_cache,
 424                 int            page)
 425 {
 426         int page_offset;
 427
 428         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 429             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 430                 return NULL;
 431
 432         if (page < pixbuf_cache->start_page) {
 433                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 434
 435                 g_assert (page_offset >= 0 &&
 436                           page_offset < pixbuf_cache->preload_cache_size);
 437                 return pixbuf_cache->prev_job + page_offset;
 438         }
 439
 440         if (page > pixbuf_cache->end_page) {
 441                 page_offset = (page - (pixbuf_cache->end_page + 1));
 442
 443                 g_assert (page_offset >= 0 &&
 444                           page_offset < pixbuf_cache->preload_cache_size);
 445                 return pixbuf_cache->next_job + page_offset;
 446         }
 447
 448         page_offset = page - pixbuf_cache->start_page;
 449         g_assert (page_offset >= 0 &&
 450                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 451         return pixbuf_cache->job_list + page_offset;
 452 }
 453
 454 static void
 455 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 456                                  gfloat         scale)
 457 {
 458         EvPageCache *page_cache;
 459         int i;
 460
 461         page_cache = ev_page_cache_get (pixbuf_cache->document);
 462
 463         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 464                 check_job_size_and_unref (pixbuf_cache->job_list + i, page_cache, scale);
 465         }
 466
 467         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 468                 check_job_size_and_unref (pixbuf_cache->prev_job + i, page_cache, scale);
 469                 check_job_size_and_unref (pixbuf_cache->next_job + i, page_cache, scale);
 470         }
 471 }
 472
 473 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 474         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 475
 476 static void
 477 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 478                    CacheJobInfo  *job_info,
 479                    EvPageCache   *page_cache,
 480                    gint           page,
 481                    gfloat         scale,
 482                    EvJobPriority  priority)
 483 {
 484         gboolean include_links = FALSE;
 485         gboolean include_text = FALSE;
 486         gboolean include_selection = FALSE;
 487         int width, height;
 488
 489         if (job_info->job)
 490                 return;
 491
 492         ev_page_cache_get_size (page_cache,
 493                                 page, scale,
 494                                 &width, &height);
 495
 496         if (job_info->pixbuf &&
 497             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 498             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 499                 return;
 500
 501         /* make a new job now */
 502         if (job_info->rc == NULL) {
 503                 job_info->rc = ev_render_context_new (EV_ORIENTATION_PORTRAIT,
 504                                                       page, scale);
 505         } else {
 506                 ev_render_context_set_page (job_info->rc, page);
 507                 ev_render_context_set_scale (job_info->rc, scale);
 508         }
 509
 510         /* Figure out what else we need for this job */
 511         if (job_info->link_mapping == NULL)
 512                 include_links = TRUE;
 513         if (job_info->text_mapping == NULL)
 514                 include_text = TRUE;
 515         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 516                 include_selection = TRUE;
 517         }
 518
 519         job_info->job = ev_job_render_new (pixbuf_cache->document,
 520                                            job_info->rc,
 521                                            width, height,
 522                                            &(job_info->new_points),
 523                                            include_links,
 524                                            include_text,
 525                                            include_selection);
 526         ev_job_queue_add_job (job_info->job, priority);
 527         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 528 }
 529
 530
 531 static void
 532 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 533                                     gfloat         scale)
 534 {
 535         EvPageCache *page_cache;
 536         CacheJobInfo *job_info;
 537         int page;
 538         int i;
 539
 540         page_cache = ev_page_cache_get (pixbuf_cache->document);
 541
 542         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 543                 job_info = (pixbuf_cache->job_list + i);
 544                 page = pixbuf_cache->start_page + i;
 545
 546                 add_job_if_needed (pixbuf_cache, job_info,
 547                                    page_cache, page, scale,
 548                                    EV_JOB_PRIORITY_HIGH);
 549         }
 550
 551         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 552                 job_info = (pixbuf_cache->prev_job + i);
 553                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 554
 555                 add_job_if_needed (pixbuf_cache, job_info,
 556                                    page_cache, page, scale,
 557                                    EV_JOB_PRIORITY_LOW);
 558         }
 559
 560         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 561                 job_info = (pixbuf_cache->next_job + i);
 562                 page = pixbuf_cache->end_page + 1 + i;
 563
 564                 add_job_if_needed (pixbuf_cache, job_info,
 565                                    page_cache, page, scale,
 566                                    EV_JOB_PRIORITY_LOW);
 567         }
 568
 569 }
 570
 571 void
 572 ev_pixbuf_cache_set_page_range (EvPixbufCache *pixbuf_cache,
 573                                 gint           start_page,
 574                                 gint           end_page,
 575                                 gfloat         scale,
 576                                 GList          *selection_list)
 577 {
 578         EvPageCache *page_cache;
 579
 580         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 581
 582         page_cache = ev_page_cache_get (pixbuf_cache->document);
 583
 584         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 585         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 586         g_return_if_fail (end_page >= start_page);
 587
 588         /* First, resize the page_range as needed.  We cull old pages
 589          * mercilessly. */
 590         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 591
 592         /* Then, we update the current jobs to see if any of them are the wrong
 593          * size, we remove them if we need to. */
 594         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 595
 596         /* Next, we update the target selection for our pages */
 597         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 598
 599         /* Finally, we add the new jobs for all the sizes that don't have a
 600          * pixbuf */
 601         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, scale);
 602 }
 603
 604 GdkPixbuf *
 605 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 606                             gint           page)
 607 {
 608         CacheJobInfo *job_info;
 609
 610         job_info = find_job_cache (pixbuf_cache, page);
 611         if (job_info == NULL)
 612                 return NULL;
 613
 614         /* We don't need to wait for the idle to handle the callback */
 615         if (job_info->job &&
 616             EV_JOB (job_info->job)->finished) {
 617                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 618         }
 619
 620         return job_info->pixbuf;
 621 }
 622
 623 GList *
 624 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 625                                   gint           page)
 626 {
 627         CacheJobInfo *job_info;
 628
 629         job_info = find_job_cache (pixbuf_cache, page);
 630         if (job_info == NULL)
 631                 return NULL;
 632
 633         /* We don't need to wait for the idle to handle the callback */
 634         if (job_info->job &&
 635             EV_JOB (job_info->job)->finished) {
 636                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 637         }
 638
 639         return job_info->link_mapping;
 640 }
 641
 642 /* Selection */
 643 static gboolean
 644 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 645                              CacheJobInfo  *job_info,
 646                              gint           page,
 647                              gfloat         scale)
 648 {
 649         EvPageCache *page_cache;
 650         gint width, height;
 651
 652         if (job_info->selection) {
 653                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 654                 ev_page_cache_get_size (page_cache, page, scale,
 655                                         &width, &height);
 656
 657                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 658                     height != gdk_pixbuf_get_height (job_info->selection))
 659                         return TRUE;
 660         } else {
 661                 if (job_info->new_points.x1 >= 0)
 662                         return TRUE;
 663         }
 664         return FALSE;
 665 }
 666
 667 static void
 668 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 669                            CacheJobInfo  *job_info,
 670                            gint           page,
 671                            gfloat         scale)
 672 {
 673         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 674                 if (job_info->selection)
 675                         g_object_unref (job_info->selection);
 676                 job_info->selection = NULL;
 677                 job_info->selection_points.x1 = -1;
 678         }
 679 }
 680
 681 GdkRegion *
 682 ev_pixbuf_cache_get_text_mapping      (EvPixbufCache *pixbuf_cache,
 683                                       gint           page)
 684 {
 685         CacheJobInfo *job_info;
 686
 687         job_info = find_job_cache (pixbuf_cache, page);
 688         if (job_info == NULL)
 689                 return NULL;
 690
 691         /* We don't need to wait for the idle to handle the callback */
 692         if (job_info->job &&
 693             EV_JOB (job_info->job)->finished) {
 694                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 695         }
 696
 697         return job_info->text_mapping;
 698 }
 699
 700 GdkPixbuf *
 701 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache *pixbuf_cache,
 702                                       gint           page,
 703                                       gfloat         scale)
 704 {
 705         CacheJobInfo *job_info;
 706
 707         /* the document does not implement the selection interface */
 708         if (!EV_IS_SELECTION (pixbuf_cache->document))
 709                 return NULL;
 710
 711         job_info = find_job_cache (pixbuf_cache, page);
 712         if (job_info == NULL)
 713                 return NULL;
 714
 715         /* No selection on this page */
 716         if (job_info->new_points.x1 < 0)
 717                 return NULL;
 718
 719         /* If we have a running job, we just return what we have under the
 720          * assumption that it'll be updated later and we can scale it as need
 721          * be */
 722         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 723                 return job_info->selection;
 724
 725         /* Now, lets see if we need to resize the image.  If we do, we clear the
 726          * old one. */
 727         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 728
 729         /* Finally, we see if the two scales are the same, and get a new pixbuf
 730          * if needed.  We do this synchronously for now.  At some point, we
 731          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 732          * doesn't kill us.  Rendering a few glyphs should really be fast.
 733          */
 734         if (ev_rect_cmp (&(job_info->new_points), &(job_info->selection_points))) {
 735                 EvRenderContext *rc;
 736
 737                 rc = ev_render_context_new (EV_ORIENTATION_PORTRAIT,
 738                                             page,
 739                                             scale);
 740
 741                 /* we need to get a new selection pixbuf */
 742                 ev_document_doc_mutex_lock ();
 743                 if (job_info->selection_points.x1 < 0) {
 744                         g_assert (job_info->selection == NULL);
 745                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 746                                                        rc, &(job_info->selection),
 747                                                        &(job_info->new_points),
 748                                                        NULL);
 749                 } else {
 750                         g_assert (job_info->selection != NULL);
 751                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 752                                                        rc, &(job_info->selection),
 753                                                        &(job_info->new_points),
 754                                                        &(job_info->selection_points));
 755                 }
 756                 job_info->selection_points = job_info->new_points;
 757                 ev_document_doc_mutex_unlock ();
 758
 759         }
 760         return job_info->selection;
 761 }
 762
 763
 764 static void
 765 update_job_selection (CacheJobInfo    *job_info,
 766                       EvViewSelection *selection)
 767 {
 768         if (job_info->selection == NULL)
 769                 job_info->selection_points.x1 = -1;
 770         job_info->new_points = selection->rect;
 771 }
 772
 773 static void
 774 clear_job_selection (CacheJobInfo *job_info)
 775 {
 776         job_info->selection_points.x1 = -1;
 777         job_info->new_points.x1 = -1;
 778
 779         if (job_info->selection) {
 780                 g_object_unref (job_info->selection);
 781                 job_info->selection = NULL;
 782         }
 783 }
 784
 785 /* This function will reset the selection on pages that no longer have them, and
 786  * will update the target_selection on those that need it.
 787  */
 788 void
 789 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 790                                     GList         *selection_list)
 791 {
 792         EvPageCache *page_cache;
 793         EvViewSelection *selection;
 794         GList *list = selection_list;
 795         int page;
 796         int i;
 797
 798         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 799
 800         page_cache = ev_page_cache_get (pixbuf_cache->document);
 801
 802         /* We check each area to see what needs updating, and what needs freeing; */
 803         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 804         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 805                 if (page < 0) {
 806                         page ++;
 807                         continue;
 808                 }
 809
 810                 selection = NULL;
 811                 while (list) {
 812                         if (((EvViewSelection *)list->data)->page == page) {
 813                                 selection = list->data;
 814                                 break;
 815                         } else if (((EvViewSelection *)list->data)->page > page)
 816                                 break;
 817                         list = list->next;
 818                 }
 819
 820                 if (selection)
 821                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 822                 else
 823                         clear_job_selection (pixbuf_cache->prev_job + i);
 824                 page ++;
 825         }
 826
 827         page = pixbuf_cache->start_page;
 828         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 829                 selection = NULL;
 830                 while (list) {
 831                         if (((EvViewSelection *)list->data)->page == page) {
 832                                 selection = list->data;
 833                                 break;
 834                         } else if (((EvViewSelection *)list->data)->page > page)
 835                                 break;
 836                         list = list->next;
 837                 }
 838
 839                 if (selection)
 840                         update_job_selection (pixbuf_cache->job_list + i, selection);
 841                 else
 842                         clear_job_selection (pixbuf_cache->job_list + i);
 843                 page ++;
 844         }
 845
 846         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 847                 if (page >= ev_page_cache_get_n_pages (page_cache))
 848                         break;
 849
 850                 selection = NULL;
 851                 while (list) {
 852                         if (((EvViewSelection *)list->data)->page == page) {
 853                                 selection = list->data;
 854                                 break;
 855                         } else if (((EvViewSelection *)list->data)->page > page)
 856                                 break;
 857                         list = list->next;
 858                 }
 859
 860                 if (selection)
 861                         update_job_selection (pixbuf_cache->next_job + i, selection);
 862                 else
 863                         clear_job_selection (pixbuf_cache->next_job + i);
 864                 page ++;
 865         }
 866 }