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                                 EV_JOB_RENDER (job_info->job)->rc->orientation,
 259                                 scale,
 260                                 &width, &height);
 261
 262         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 263             height == EV_JOB_RENDER (job_info->job)->target_height)
 264                 return;
 265
 266         /* Try to remove the job.  If we can't, then the thread has already
 267          * picked it up and we are going get a signal when it's done.  If we
 268          * can, then the job is fully dead and will never rnu.. */
 269         if (ev_job_queue_remove_job (job_info->job))
 270                 g_object_unref (job_info->job);
 271
 272         job_info->job = NULL;
 273 }
 274
 275 /* Do all function that copies a job from an older cache to it's position in the
 276  * new cache.  It clears the old job if it doesn't have a place.
 277  */
 278 static void
 279 move_one_job (CacheJobInfo  *job_info,
 280               EvPixbufCache *pixbuf_cache,
 281               int            page,
 282               CacheJobInfo  *new_job_list,
 283               CacheJobInfo  *new_prev_job,
 284               CacheJobInfo  *new_next_job,
 285               int            start_page,
 286               int            end_page,
 287               EvJobPriority  priority)
 288 {
 289         CacheJobInfo *target_page = NULL;
 290         int page_offset;
 291         EvJobPriority new_priority;
 292
 293         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 294             page > (end_page + pixbuf_cache->preload_cache_size)) {
 295                 dispose_cache_job_info (job_info, pixbuf_cache);
 296                 return;
 297         }
 298
 299         /* find the target page to copy it over to. */
 300         if (page < start_page) {
 301                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 302
 303                 g_assert (page_offset >= 0 &&
 304                           page_offset < pixbuf_cache->preload_cache_size);
 305                 target_page = new_prev_job + page_offset;
 306                 new_priority = EV_JOB_PRIORITY_LOW;
 307         } else if (page > end_page) {
 308                 page_offset = (page - (end_page + 1));
 309
 310                 g_assert (page_offset >= 0 &&
 311                           page_offset < pixbuf_cache->preload_cache_size);
 312                 target_page = new_next_job + page_offset;
 313                 new_priority = EV_JOB_PRIORITY_LOW;
 314         } else {
 315                 page_offset = page - start_page;
 316                 g_assert (page_offset >= 0 &&
 317                           page_offset <= ((end_page - start_page) + 1));
 318                 new_priority = EV_JOB_PRIORITY_HIGH;
 319                 target_page = new_job_list + page_offset;
 320         }
 321
 322         *target_page = *job_info;
 323         job_info->job = NULL;
 324         job_info->pixbuf = NULL;
 325         job_info->link_mapping = NULL;
 326
 327         if (new_priority != priority && target_page->job) {
 328                 ev_job_queue_update_job (target_page->job, new_priority);
 329         }
 330 }
 331
 332
 333
 334 static void
 335 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 336                               gint           start_page,
 337                               gint           end_page)
 338 {
 339         CacheJobInfo *new_job_list;
 340         CacheJobInfo *new_prev_job;
 341         CacheJobInfo *new_next_job;
 342         EvPageCache *page_cache;
 343         int i, page;
 344
 345         if (pixbuf_cache->start_page == start_page &&
 346             pixbuf_cache->end_page == end_page)
 347                 return;
 348
 349         page_cache = ev_page_cache_get (pixbuf_cache->document);
 350
 351         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 352         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 353         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 354
 355         /* We go through each job in the old cache and either clear it or move
 356          * it to a new location. */
 357
 358         /* Start with the prev cache. */
 359         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 360         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 361                 if (page < 0) {
 362                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 363                 } else {
 364                         move_one_job (pixbuf_cache->prev_job + i,
 365                                       pixbuf_cache, page,
 366                                       new_job_list, new_prev_job, new_next_job,
 367                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 368                 }
 369                 page ++;
 370         }
 371
 372         page = pixbuf_cache->start_page;
 373         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 374                 move_one_job (pixbuf_cache->job_list + i,
 375                               pixbuf_cache, page,
 376                               new_job_list, new_prev_job, new_next_job,
 377                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 378                 page ++;
 379         }
 380
 381         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 382                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 383                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 384                 } else {
 385                         move_one_job (pixbuf_cache->next_job + i,
 386                                       pixbuf_cache, page,
 387                                       new_job_list, new_prev_job, new_next_job,
 388                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 389                 }
 390                 page ++;
 391         }
 392
 393         g_free (pixbuf_cache->job_list);
 394         g_free (pixbuf_cache->prev_job);
 395         g_free (pixbuf_cache->next_job);
 396
 397         pixbuf_cache->job_list = new_job_list;
 398         pixbuf_cache->prev_job = new_prev_job;
 399         pixbuf_cache->next_job = new_next_job;
 400
 401         pixbuf_cache->start_page = start_page;
 402         pixbuf_cache->end_page = end_page;
 403 }
 404
 405 static void
 406 copy_job_to_job_info (EvJobRender   *job_render,
 407                       CacheJobInfo  *job_info,
 408                       EvPixbufCache *pixbuf_cache)
 409 {
 410         GdkPixbuf *pixbuf;
 411
 412         pixbuf = g_object_ref (job_render->pixbuf);
 413
 414         dispose_cache_job_info (job_info, pixbuf_cache);
 415
 416         job_info->pixbuf = pixbuf;
 417         if (job_render->link_mapping)
 418                 job_info->link_mapping = job_render->link_mapping;
 419         if (job_render->text_mapping)
 420                 job_info->text_mapping = job_render->text_mapping;
 421 }
 422
 423 static CacheJobInfo *
 424 find_job_cache (EvPixbufCache *pixbuf_cache,
 425                 int            page)
 426 {
 427         int page_offset;
 428
 429         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 430             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 431                 return NULL;
 432
 433         if (page < pixbuf_cache->start_page) {
 434                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 435
 436                 g_assert (page_offset >= 0 &&
 437                           page_offset < pixbuf_cache->preload_cache_size);
 438                 return pixbuf_cache->prev_job + page_offset;
 439         }
 440
 441         if (page > pixbuf_cache->end_page) {
 442                 page_offset = (page - (pixbuf_cache->end_page + 1));
 443
 444                 g_assert (page_offset >= 0 &&
 445                           page_offset < pixbuf_cache->preload_cache_size);
 446                 return pixbuf_cache->next_job + page_offset;
 447         }
 448
 449         page_offset = page - pixbuf_cache->start_page;
 450         g_assert (page_offset >= 0 &&
 451                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 452         return pixbuf_cache->job_list + page_offset;
 453 }
 454
 455 static void
 456 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 457                                  gfloat         scale)
 458 {
 459         EvPageCache *page_cache;
 460         int i;
 461
 462         page_cache = ev_page_cache_get (pixbuf_cache->document);
 463
 464         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 465                 check_job_size_and_unref (pixbuf_cache->job_list + i, page_cache, scale);
 466         }
 467
 468         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 469                 check_job_size_and_unref (pixbuf_cache->prev_job + i, page_cache, scale);
 470                 check_job_size_and_unref (pixbuf_cache->next_job + i, page_cache, scale);
 471         }
 472 }
 473
 474 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 475         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 476
 477 static void
 478 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 479                    CacheJobInfo  *job_info,
 480                    EvPageCache   *page_cache,
 481                    gint           page,
 482                    EvOrientation  orientation,
 483                    gfloat         scale,
 484                    EvJobPriority  priority)
 485 {
 486         gboolean include_links = FALSE;
 487         gboolean include_text = FALSE;
 488         gboolean include_selection = FALSE;
 489         int width, height;
 490
 491         if (job_info->job)
 492                 return;
 493
 494         ev_page_cache_get_size (page_cache, page, orientation,
 495                                 scale, &width, &height);
 496
 497         if (job_info->pixbuf &&
 498             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 499             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 500                 return;
 501
 502         /* make a new job now */
 503         if (job_info->rc == NULL) {
 504                 job_info->rc = ev_render_context_new (orientation, 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                 ev_render_context_set_orientation (job_info->rc, orientation);
 509         }
 510
 511         /* Figure out what else we need for this job */
 512         if (job_info->link_mapping == NULL)
 513                 include_links = TRUE;
 514         if (job_info->text_mapping == NULL)
 515                 include_text = TRUE;
 516         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 517                 include_selection = TRUE;
 518         }
 519
 520         job_info->job = ev_job_render_new (pixbuf_cache->document,
 521                                            job_info->rc,
 522                                            width, height,
 523                                            &(job_info->new_points),
 524                                            include_links,
 525                                            include_text,
 526                                            include_selection);
 527         ev_job_queue_add_job (job_info->job, priority);
 528         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 529 }
 530
 531
 532 static void
 533 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 534                                     EvOrientation  orientation,
 535                                     gfloat         scale)
 536 {
 537         EvPageCache *page_cache;
 538         CacheJobInfo *job_info;
 539         int page;
 540         int i;
 541
 542         page_cache = ev_page_cache_get (pixbuf_cache->document);
 543
 544         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 545                 job_info = (pixbuf_cache->job_list + i);
 546                 page = pixbuf_cache->start_page + i;
 547
 548                 add_job_if_needed (pixbuf_cache, job_info,
 549                                    page_cache, page, orientation, scale,
 550                                    EV_JOB_PRIORITY_HIGH);
 551         }
 552
 553         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 554                 job_info = (pixbuf_cache->prev_job + i);
 555                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 556
 557                 add_job_if_needed (pixbuf_cache, job_info,
 558                                    page_cache, page, orientation, scale,
 559                                    EV_JOB_PRIORITY_LOW);
 560         }
 561
 562         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 563                 job_info = (pixbuf_cache->next_job + i);
 564                 page = pixbuf_cache->end_page + 1 + i;
 565
 566                 add_job_if_needed (pixbuf_cache, job_info,
 567                                    page_cache, page, orientation, scale,
 568                                    EV_JOB_PRIORITY_LOW);
 569         }
 570
 571 }
 572
 573 void
 574 ev_pixbuf_cache_set_page_range (EvPixbufCache *pixbuf_cache,
 575                                 gint           start_page,
 576                                 gint           end_page,
 577                                 EvOrientation  orientation,
 578                                 gfloat         scale,
 579                                 GList          *selection_list)
 580 {
 581         EvPageCache *page_cache;
 582
 583         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 584
 585         page_cache = ev_page_cache_get (pixbuf_cache->document);
 586
 587         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 588         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 589         g_return_if_fail (end_page >= start_page);
 590
 591         /* First, resize the page_range as needed.  We cull old pages
 592          * mercilessly. */
 593         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 594
 595         /* Then, we update the current jobs to see if any of them are the wrong
 596          * size, we remove them if we need to. */
 597         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 598
 599         /* Next, we update the target selection for our pages */
 600         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 601
 602         /* Finally, we add the new jobs for all the sizes that don't have a
 603          * pixbuf */
 604         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, orientation, scale);
 605 }
 606
 607 GdkPixbuf *
 608 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 609                             gint           page)
 610 {
 611         CacheJobInfo *job_info;
 612
 613         job_info = find_job_cache (pixbuf_cache, page);
 614         if (job_info == NULL)
 615                 return NULL;
 616
 617         /* We don't need to wait for the idle to handle the callback */
 618         if (job_info->job &&
 619             EV_JOB (job_info->job)->finished) {
 620                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 621         }
 622
 623         return job_info->pixbuf;
 624 }
 625
 626 GList *
 627 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 628                                   gint           page)
 629 {
 630         CacheJobInfo *job_info;
 631
 632         job_info = find_job_cache (pixbuf_cache, page);
 633         if (job_info == NULL)
 634                 return NULL;
 635
 636         /* We don't need to wait for the idle to handle the callback */
 637         if (job_info->job &&
 638             EV_JOB (job_info->job)->finished) {
 639                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 640         }
 641
 642         return job_info->link_mapping;
 643 }
 644
 645 /* Selection */
 646 static gboolean
 647 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 648                              CacheJobInfo  *job_info,
 649                              gint           page,
 650                              gfloat         scale)
 651 {
 652         EvPageCache *page_cache;
 653         gint width, height;
 654
 655         if (job_info->selection) {
 656                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 657                 ev_page_cache_get_size (page_cache, page, job_info->rc->orientation,
 658                                         scale, &width, &height);
 659
 660                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 661                     height != gdk_pixbuf_get_height (job_info->selection))
 662                         return TRUE;
 663         } else {
 664                 if (job_info->new_points.x1 >= 0)
 665                         return TRUE;
 666         }
 667         return FALSE;
 668 }
 669
 670 static void
 671 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 672                            CacheJobInfo  *job_info,
 673                            gint           page,
 674                            gfloat         scale)
 675 {
 676         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 677                 if (job_info->selection)
 678                         g_object_unref (job_info->selection);
 679                 job_info->selection = NULL;
 680                 job_info->selection_points.x1 = -1;
 681         }
 682 }
 683
 684 GdkRegion *
 685 ev_pixbuf_cache_get_text_mapping      (EvPixbufCache *pixbuf_cache,
 686                                       gint           page)
 687 {
 688         CacheJobInfo *job_info;
 689
 690         job_info = find_job_cache (pixbuf_cache, page);
 691         if (job_info == NULL)
 692                 return NULL;
 693
 694         /* We don't need to wait for the idle to handle the callback */
 695         if (job_info->job &&
 696             EV_JOB (job_info->job)->finished) {
 697                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 698         }
 699
 700         return job_info->text_mapping;
 701 }
 702
 703 GdkPixbuf *
 704 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache *pixbuf_cache,
 705                                       gint           page,
 706                                       gfloat         scale)
 707 {
 708         CacheJobInfo *job_info;
 709
 710         /* the document does not implement the selection interface */
 711         if (!EV_IS_SELECTION (pixbuf_cache->document))
 712                 return NULL;
 713
 714         job_info = find_job_cache (pixbuf_cache, page);
 715         if (job_info == NULL)
 716                 return NULL;
 717
 718         /* No selection on this page */
 719         if (job_info->new_points.x1 < 0)
 720                 return NULL;
 721
 722         /* If we have a running job, we just return what we have under the
 723          * assumption that it'll be updated later and we can scale it as need
 724          * be */
 725         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 726                 return job_info->selection;
 727
 728         /* Now, lets see if we need to resize the image.  If we do, we clear the
 729          * old one. */
 730         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 731
 732         /* Finally, we see if the two scales are the same, and get a new pixbuf
 733          * if needed.  We do this synchronously for now.  At some point, we
 734          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 735          * doesn't kill us.  Rendering a few glyphs should really be fast.
 736          */
 737         if (ev_rect_cmp (&(job_info->new_points), &(job_info->selection_points))) {
 738                 EvRenderContext *rc;
 739
 740                 rc = ev_render_context_new (EV_ORIENTATION_PORTRAIT,
 741                                             page,
 742                                             scale);
 743
 744                 /* we need to get a new selection pixbuf */
 745                 ev_document_doc_mutex_lock ();
 746                 if (job_info->selection_points.x1 < 0) {
 747                         g_assert (job_info->selection == NULL);
 748                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 749                                                        rc, &(job_info->selection),
 750                                                        &(job_info->new_points),
 751                                                        NULL);
 752                 } else {
 753                         g_assert (job_info->selection != NULL);
 754                         ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 755                                                        rc, &(job_info->selection),
 756                                                        &(job_info->new_points),
 757                                                        &(job_info->selection_points));
 758                 }
 759                 job_info->selection_points = job_info->new_points;
 760                 ev_document_doc_mutex_unlock ();
 761
 762         }
 763         return job_info->selection;
 764 }
 765
 766
 767 static void
 768 update_job_selection (CacheJobInfo    *job_info,
 769                       EvViewSelection *selection)
 770 {
 771         if (job_info->selection == NULL)
 772                 job_info->selection_points.x1 = -1;
 773         job_info->new_points = selection->rect;
 774 }
 775
 776 static void
 777 clear_job_selection (CacheJobInfo *job_info)
 778 {
 779         job_info->selection_points.x1 = -1;
 780         job_info->new_points.x1 = -1;
 781
 782         if (job_info->selection) {
 783                 g_object_unref (job_info->selection);
 784                 job_info->selection = NULL;
 785         }
 786 }
 787
 788 /* This function will reset the selection on pages that no longer have them, and
 789  * will update the target_selection on those that need it.
 790  */
 791 void
 792 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 793                                     GList         *selection_list)
 794 {
 795         EvPageCache *page_cache;
 796         EvViewSelection *selection;
 797         GList *list = selection_list;
 798         int page;
 799         int i;
 800
 801         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 802
 803         page_cache = ev_page_cache_get (pixbuf_cache->document);
 804
 805         /* We check each area to see what needs updating, and what needs freeing; */
 806         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 807         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 808                 if (page < 0) {
 809                         page ++;
 810                         continue;
 811                 }
 812
 813                 selection = NULL;
 814                 while (list) {
 815                         if (((EvViewSelection *)list->data)->page == page) {
 816                                 selection = list->data;
 817                                 break;
 818                         } else if (((EvViewSelection *)list->data)->page > page)
 819                                 break;
 820                         list = list->next;
 821                 }
 822
 823                 if (selection)
 824                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 825                 else
 826                         clear_job_selection (pixbuf_cache->prev_job + i);
 827                 page ++;
 828         }
 829
 830         page = pixbuf_cache->start_page;
 831         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 832                 selection = NULL;
 833                 while (list) {
 834                         if (((EvViewSelection *)list->data)->page == page) {
 835                                 selection = list->data;
 836                                 break;
 837                         } else if (((EvViewSelection *)list->data)->page > page)
 838                                 break;
 839                         list = list->next;
 840                 }
 841
 842                 if (selection)
 843                         update_job_selection (pixbuf_cache->job_list + i, selection);
 844                 else
 845                         clear_job_selection (pixbuf_cache->job_list + i);
 846                 page ++;
 847         }
 848
 849         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 850                 if (page >= ev_page_cache_get_n_pages (page_cache))
 851                         break;
 852
 853                 selection = NULL;
 854                 while (list) {
 855                         if (((EvViewSelection *)list->data)->page == page) {
 856                                 selection = list->data;
 857                                 break;
 858                         } else if (((EvViewSelection *)list->data)->page > page)
 859                                 break;
 860                         list = list->next;
 861                 }
 862
 863                 if (selection)
 864                         update_job_selection (pixbuf_cache->next_job + i, selection);
 865                 else
 866                         clear_job_selection (pixbuf_cache->next_job + i);
 867                 page ++;
 868         }
 869 }