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         GdkRegion *selection_region;
  20         EvRectangle new_points;
  21 } CacheJobInfo;
  22
  23 struct _EvPixbufCache
  24 {
  25         GObject parent;
  26
  27         /* We keep a link to our containing view just for style information. */
  28         GtkWidget *view;
  29         EvDocument *document;
  30         int start_page;
  31         int end_page;
  32
  33         /* preload_cache_size is the number of pages prior to the current
  34          * visible area that we cache.  It's normally 1, but could be 2 in the
  35          * case of twin pages.
  36          */
  37         int preload_cache_size;
  38         CacheJobInfo *prev_job;
  39         CacheJobInfo *job_list;
  40         CacheJobInfo *next_job;
  41 };
  42
  43 struct _EvPixbufCacheClass
  44 {
  45         GObjectClass parent_class;
  46
  47         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  48 };
  49
  50
  51 enum
  52 {
  53         JOB_FINISHED,
  54         N_SIGNALS,
  55 };
  56
  57 static guint signals[N_SIGNALS] = {0, };
  58
  59 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  60 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  61 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  62 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  63 static void          job_finished_cb            (EvJob              *job,
  64                                                  EvPixbufCache      *pixbuf_cache);
  65 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  66                                                  int                 page);
  67 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  68                                                  CacheJobInfo       *job_info,
  69                                                  EvPixbufCache      *pixbuf_cache);
  70 static gboolean      new_selection_pixbuf_needed(EvPixbufCache      *pixbuf_cache,
  71                                                  CacheJobInfo       *job_info,
  72                                                  gint                page,
  73                                                  gfloat              scale);
  74
  75
  76 /* These are used for iterating through the prev and next arrays */
  77 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  78         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  79 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  80         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  81 #define PAGE_CACHE_LEN(pixbuf_cache) \
  82         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  83
  84 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  85
  86 static void
  87 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  88 {
  89         pixbuf_cache->start_page = 0;
  90         pixbuf_cache->end_page = 0;
  91         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
  92
  93         pixbuf_cache->preload_cache_size = 2;
  94         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  95         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  96 }
  97
  98 static void
  99 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
 100 {
 101         GObjectClass *object_class;
 102
 103         object_class = G_OBJECT_CLASS (class);
 104
 105         object_class->finalize = ev_pixbuf_cache_finalize;
 106         object_class->dispose = ev_pixbuf_cache_dispose;
 107
 108         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 109                                             G_OBJECT_CLASS_TYPE (object_class),
 110                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 111                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 112                                             NULL, NULL,
 113                                             g_cclosure_marshal_VOID__VOID,
 114                                             G_TYPE_NONE, 0);
 115 }
 116
 117 static void
 118 ev_pixbuf_cache_finalize (GObject *object)
 119 {
 120         EvPixbufCache *pixbuf_cache;
 121
 122         pixbuf_cache = EV_PIXBUF_CACHE (object);
 123
 124         g_free (pixbuf_cache->prev_job);
 125         g_free (pixbuf_cache->job_list);
 126         g_free (pixbuf_cache->next_job);
 127 }
 128
 129 static void
 130 dispose_cache_job_info (CacheJobInfo *job_info,
 131                         gpointer      data)
 132 {
 133         if (job_info == NULL)
 134                 return;
 135         if (job_info->job) {
 136                 g_signal_handlers_disconnect_by_func (job_info->job,
 137                                                       G_CALLBACK (job_finished_cb),
 138                                                       data);
 139                 ev_job_queue_remove_job (job_info->job);
 140                 g_object_unref (G_OBJECT (job_info->job));
 141                 job_info->job = NULL;
 142         }
 143         if (job_info->pixbuf) {
 144                 g_object_unref (G_OBJECT (job_info->pixbuf));
 145                 job_info->pixbuf = NULL;
 146         }
 147         if (job_info->link_mapping) {
 148                 ev_link_mapping_free (job_info->link_mapping);
 149                 job_info->link_mapping = NULL;
 150         }
 151         if (job_info->text_mapping) {
 152                 gdk_region_destroy (job_info->text_mapping);
 153                 job_info->text_mapping = NULL;
 154         }
 155         if (job_info->selection) {
 156                 g_object_unref (G_OBJECT (job_info->selection));
 157                 job_info->selection = NULL;
 158         }
 159         if (job_info->selection_region) {
 160                 gdk_region_destroy (job_info->selection_region);
 161                 job_info->selection_region = NULL;
 162         }
 163         if (job_info->rc) {
 164                 g_object_unref (G_OBJECT (job_info->rc));
 165                 job_info->rc = NULL;
 166         }
 167
 168         job_info->selection_points.x1 = -1;
 169         job_info->new_points.x1 = -1;
 170 }
 171
 172 static void
 173 ev_pixbuf_cache_dispose (GObject *object)
 174 {
 175         EvPixbufCache *pixbuf_cache;
 176         int i;
 177
 178         pixbuf_cache = EV_PIXBUF_CACHE (object);
 179
 180         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 181                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 182                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 183         }
 184
 185         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 186                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 187         }
 188 }
 189
 190
 191 EvPixbufCache *
 192 ev_pixbuf_cache_new (GtkWidget  *view,
 193                      EvDocument *document)
 194 {
 195         EvPixbufCache *pixbuf_cache;
 196
 197         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 198         /* This is a backlink, so we don't ref this */
 199         pixbuf_cache->view = view;
 200         pixbuf_cache->document = document;
 201
 202         return pixbuf_cache;
 203 }
 204
 205 static void
 206 job_finished_cb (EvJob         *job,
 207                  EvPixbufCache *pixbuf_cache)
 208 {
 209         CacheJobInfo *job_info;
 210         EvJobRender *job_render = EV_JOB_RENDER (job);
 211         GdkPixbuf *pixbuf;
 212
 213         /* If the job is outside of our interest, we silently discard it */
 214         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 215             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 216                 g_object_unref (job);
 217                 return;
 218         }
 219
 220         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 221
 222         pixbuf = g_object_ref (job_render->pixbuf);
 223         if (job_info->pixbuf)
 224                 g_object_unref (job_info->pixbuf);
 225         job_info->pixbuf = pixbuf;
 226
 227         if (job_render->link_mapping) {
 228                 if (job_info->link_mapping)
 229                         ev_link_mapping_free (job_info->link_mapping);
 230                 job_info->link_mapping = job_render->link_mapping;
 231         }
 232
 233         if (job_render->text_mapping) {
 234                 if (job_info->text_mapping)
 235                         gdk_region_destroy (job_info->text_mapping);
 236                 job_info->text_mapping = job_render->text_mapping;
 237         }
 238
 239         if (job_render->include_selection) {
 240                 pixbuf = g_object_ref (job_render->selection);
 241                 if (job_info->selection)
 242                         g_object_unref (job_info->selection);
 243                 if (job_info->selection_region)
 244                         gdk_region_destroy (job_info->selection_region);
 245                 job_info->selection_points = job_render->selection_points;
 246                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 247                 job_info->selection = pixbuf;
 248                 g_assert (job_info->selection_points.x1 >= 0);
 249         }
 250
 251         if (job_info->job == job)
 252                 job_info->job = NULL;
 253         g_object_unref (job);
 254
 255         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 256 }
 257
 258 /* This checks a job to see if the job would generate the right sized pixbuf
 259  * given a scale.  If it won't, it removes the job and clears it to NULL.
 260  */
 261 static void
 262 check_job_size_and_unref (CacheJobInfo *job_info,
 263                           EvPageCache  *page_cache,
 264                           gfloat        scale)
 265 {
 266         gint width;
 267         gint height;
 268
 269         g_assert (job_info);
 270
 271         if (job_info->job == NULL)
 272                 return;
 273
 274         ev_page_cache_get_size (page_cache,
 275                                 EV_JOB_RENDER (job_info->job)->rc->page,
 276                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 277                                 scale,
 278                                 &width, &height);
 279
 280         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 281             height == EV_JOB_RENDER (job_info->job)->target_height)
 282                 return;
 283
 284         /* Try to remove the job.  If we can't, then the thread has already
 285          * picked it up and we are going get a signal when it's done.  If we
 286          * can, then the job is fully dead and will never rnu.. */
 287         if (ev_job_queue_remove_job (job_info->job))
 288                 g_object_unref (job_info->job);
 289
 290         job_info->job = NULL;
 291 }
 292
 293 /* Do all function that copies a job from an older cache to it's position in the
 294  * new cache.  It clears the old job if it doesn't have a place.
 295  */
 296 static void
 297 move_one_job (CacheJobInfo  *job_info,
 298               EvPixbufCache *pixbuf_cache,
 299               int            page,
 300               CacheJobInfo  *new_job_list,
 301               CacheJobInfo  *new_prev_job,
 302               CacheJobInfo  *new_next_job,
 303               int            start_page,
 304               int            end_page,
 305               EvJobPriority  priority)
 306 {
 307         CacheJobInfo *target_page = NULL;
 308         int page_offset;
 309         EvJobPriority new_priority;
 310
 311         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 312             page > (end_page + pixbuf_cache->preload_cache_size)) {
 313                 dispose_cache_job_info (job_info, pixbuf_cache);
 314                 return;
 315         }
 316
 317         /* find the target page to copy it over to. */
 318         if (page < start_page) {
 319                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 320
 321                 g_assert (page_offset >= 0 &&
 322                           page_offset < pixbuf_cache->preload_cache_size);
 323                 target_page = new_prev_job + page_offset;
 324                 new_priority = EV_JOB_PRIORITY_LOW;
 325         } else if (page > end_page) {
 326                 page_offset = (page - (end_page + 1));
 327
 328                 g_assert (page_offset >= 0 &&
 329                           page_offset < pixbuf_cache->preload_cache_size);
 330                 target_page = new_next_job + page_offset;
 331                 new_priority = EV_JOB_PRIORITY_LOW;
 332         } else {
 333                 page_offset = page - start_page;
 334                 g_assert (page_offset >= 0 &&
 335                           page_offset <= ((end_page - start_page) + 1));
 336                 new_priority = EV_JOB_PRIORITY_HIGH;
 337                 target_page = new_job_list + page_offset;
 338         }
 339
 340         *target_page = *job_info;
 341         job_info->job = NULL;
 342         job_info->pixbuf = NULL;
 343         job_info->link_mapping = NULL;
 344
 345         if (new_priority != priority && target_page->job) {
 346                 ev_job_queue_update_job (target_page->job, new_priority);
 347         }
 348 }
 349
 350
 351
 352 static void
 353 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 354                               gint           start_page,
 355                               gint           end_page)
 356 {
 357         CacheJobInfo *new_job_list;
 358         CacheJobInfo *new_prev_job;
 359         CacheJobInfo *new_next_job;
 360         EvPageCache *page_cache;
 361         int i, page;
 362
 363         if (pixbuf_cache->start_page == start_page &&
 364             pixbuf_cache->end_page == end_page)
 365                 return;
 366
 367         page_cache = ev_page_cache_get (pixbuf_cache->document);
 368
 369         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 370         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 371         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 372
 373         /* We go through each job in the old cache and either clear it or move
 374          * it to a new location. */
 375
 376         /* Start with the prev cache. */
 377         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 378         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 379                 if (page < 0) {
 380                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 381                 } else {
 382                         move_one_job (pixbuf_cache->prev_job + i,
 383                                       pixbuf_cache, page,
 384                                       new_job_list, new_prev_job, new_next_job,
 385                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 386                 }
 387                 page ++;
 388         }
 389
 390         page = pixbuf_cache->start_page;
 391         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 392                 move_one_job (pixbuf_cache->job_list + i,
 393                               pixbuf_cache, page,
 394                               new_job_list, new_prev_job, new_next_job,
 395                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 396                 page ++;
 397         }
 398
 399         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 400                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 401                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 402                 } else {
 403                         move_one_job (pixbuf_cache->next_job + i,
 404                                       pixbuf_cache, page,
 405                                       new_job_list, new_prev_job, new_next_job,
 406                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 407                 }
 408                 page ++;
 409         }
 410
 411         g_free (pixbuf_cache->job_list);
 412         g_free (pixbuf_cache->prev_job);
 413         g_free (pixbuf_cache->next_job);
 414
 415         pixbuf_cache->job_list = new_job_list;
 416         pixbuf_cache->prev_job = new_prev_job;
 417         pixbuf_cache->next_job = new_next_job;
 418
 419         pixbuf_cache->start_page = start_page;
 420         pixbuf_cache->end_page = end_page;
 421 }
 422
 423 static void
 424 copy_job_to_job_info (EvJobRender   *job_render,
 425                       CacheJobInfo  *job_info,
 426                       EvPixbufCache *pixbuf_cache)
 427 {
 428         GdkPixbuf *pixbuf;
 429
 430         pixbuf = g_object_ref (job_render->pixbuf);
 431
 432         dispose_cache_job_info (job_info, pixbuf_cache);
 433
 434         job_info->pixbuf = pixbuf;
 435         if (job_render->link_mapping)
 436                 job_info->link_mapping = job_render->link_mapping;
 437         if (job_render->text_mapping)
 438                 job_info->text_mapping = job_render->text_mapping;
 439 }
 440
 441 static CacheJobInfo *
 442 find_job_cache (EvPixbufCache *pixbuf_cache,
 443                 int            page)
 444 {
 445         int page_offset;
 446
 447         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 448             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 449                 return NULL;
 450
 451         if (page < pixbuf_cache->start_page) {
 452                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 453
 454                 g_assert (page_offset >= 0 &&
 455                           page_offset < pixbuf_cache->preload_cache_size);
 456                 return pixbuf_cache->prev_job + page_offset;
 457         }
 458
 459         if (page > pixbuf_cache->end_page) {
 460                 page_offset = (page - (pixbuf_cache->end_page + 1));
 461
 462                 g_assert (page_offset >= 0 &&
 463                           page_offset < pixbuf_cache->preload_cache_size);
 464                 return pixbuf_cache->next_job + page_offset;
 465         }
 466
 467         page_offset = page - pixbuf_cache->start_page;
 468         g_assert (page_offset >= 0 &&
 469                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 470         return pixbuf_cache->job_list + page_offset;
 471 }
 472
 473 static void
 474 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 475                                  gfloat         scale)
 476 {
 477         EvPageCache *page_cache;
 478         int i;
 479
 480         page_cache = ev_page_cache_get (pixbuf_cache->document);
 481
 482         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 483                 check_job_size_and_unref (pixbuf_cache->job_list + i, page_cache, scale);
 484         }
 485
 486         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 487                 check_job_size_and_unref (pixbuf_cache->prev_job + i, page_cache, scale);
 488                 check_job_size_and_unref (pixbuf_cache->next_job + i, page_cache, scale);
 489         }
 490 }
 491
 492 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 493         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 494
 495 static void
 496 get_selection_colors (GtkWidget *widget, GdkColor **text, GdkColor **base)
 497 {
 498     if (GTK_WIDGET_HAS_FOCUS (widget)) {
 499         *text = &widget->style->text [GTK_STATE_SELECTED];
 500         *base = &widget->style->base [GTK_STATE_SELECTED];
 501     } else {
 502         *text = &widget->style->text [GTK_STATE_ACTIVE];
 503         *base = &widget->style->base [GTK_STATE_ACTIVE];
 504     }
 505 }
 506
 507 static void
 508 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 509                    CacheJobInfo  *job_info,
 510                    EvPageCache   *page_cache,
 511                    gint           page,
 512                    gint           rotation,
 513                    gfloat         scale,
 514                    EvJobPriority  priority)
 515 {
 516         gboolean include_links = FALSE;
 517         gboolean include_text = FALSE;
 518         gboolean include_selection = FALSE;
 519         int width, height;
 520         GdkColor *text, *base;
 521
 522         if (job_info->job)
 523                 return;
 524
 525         ev_page_cache_get_size (page_cache, page, rotation,
 526                                 scale, &width, &height);
 527
 528         if (job_info->pixbuf &&
 529             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 530             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 531                 return;
 532
 533         /* make a new job now */
 534         if (job_info->rc == NULL) {
 535                 job_info->rc = ev_render_context_new (rotation, page, scale);
 536         } else {
 537                 ev_render_context_set_rotation (job_info->rc, rotation);
 538                 ev_render_context_set_page (job_info->rc, page);
 539                 ev_render_context_set_scale (job_info->rc, scale);
 540         }
 541
 542         /* Figure out what else we need for this job */
 543         if (job_info->link_mapping == NULL)
 544                 include_links = TRUE;
 545         if (job_info->text_mapping == NULL)
 546                 include_text = TRUE;
 547         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 548                 include_selection = TRUE;
 549         }
 550
 551         gtk_widget_ensure_style (pixbuf_cache->view);
 552
 553         get_selection_colors (pixbuf_cache->view, &text, &base);
 554
 555         job_info->job = ev_job_render_new (pixbuf_cache->document,
 556                                            job_info->rc,
 557                                            width, height,
 558                                            &(job_info->new_points),
 559                                            text, base,
 560                                            include_links,
 561                                            include_text,
 562                                            include_selection);
 563         ev_job_queue_add_job (job_info->job, priority);
 564         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 565 }
 566
 567
 568 static void
 569 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 570                                     gint           rotation,
 571                                     gfloat         scale)
 572 {
 573         EvPageCache *page_cache;
 574         CacheJobInfo *job_info;
 575         int page;
 576         int i;
 577
 578         page_cache = ev_page_cache_get (pixbuf_cache->document);
 579
 580         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 581                 job_info = (pixbuf_cache->job_list + i);
 582                 page = pixbuf_cache->start_page + i;
 583
 584                 add_job_if_needed (pixbuf_cache, job_info,
 585                                    page_cache, page, rotation, scale,
 586                                    EV_JOB_PRIORITY_HIGH);
 587         }
 588
 589         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 590                 job_info = (pixbuf_cache->prev_job + i);
 591                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 592
 593                 add_job_if_needed (pixbuf_cache, job_info,
 594                                    page_cache, page, rotation, scale,
 595                                    EV_JOB_PRIORITY_LOW);
 596         }
 597
 598         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 599                 job_info = (pixbuf_cache->next_job + i);
 600                 page = pixbuf_cache->end_page + 1 + i;
 601
 602                 add_job_if_needed (pixbuf_cache, job_info,
 603                                    page_cache, page, rotation, scale,
 604                                    EV_JOB_PRIORITY_LOW);
 605         }
 606
 607 }
 608
 609 void
 610 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 611                                 gint            start_page,
 612                                 gint            end_page,
 613                                 gint            rotation,
 614                                 gfloat          scale,
 615                                 GList          *selection_list)
 616 {
 617         EvPageCache *page_cache;
 618
 619         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 620
 621         page_cache = ev_page_cache_get (pixbuf_cache->document);
 622
 623         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 624         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 625         g_return_if_fail (end_page >= start_page);
 626
 627         /* First, resize the page_range as needed.  We cull old pages
 628          * mercilessly. */
 629         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 630
 631         /* Then, we update the current jobs to see if any of them are the wrong
 632          * size, we remove them if we need to. */
 633         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 634
 635         /* Next, we update the target selection for our pages */
 636         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 637
 638         /* Finally, we add the new jobs for all the sizes that don't have a
 639          * pixbuf */
 640         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 641 }
 642
 643 GdkPixbuf *
 644 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 645                             gint           page)
 646 {
 647         CacheJobInfo *job_info;
 648
 649         job_info = find_job_cache (pixbuf_cache, page);
 650         if (job_info == NULL)
 651                 return NULL;
 652
 653         /* We don't need to wait for the idle to handle the callback */
 654         if (job_info->job &&
 655             EV_JOB (job_info->job)->finished) {
 656                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 657         }
 658
 659         return job_info->pixbuf;
 660 }
 661
 662 GList *
 663 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 664                                   gint           page)
 665 {
 666         CacheJobInfo *job_info;
 667
 668         job_info = find_job_cache (pixbuf_cache, page);
 669         if (job_info == NULL)
 670                 return NULL;
 671
 672         /* We don't need to wait for the idle to handle the callback */
 673         if (job_info->job &&
 674             EV_JOB (job_info->job)->finished) {
 675                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 676         }
 677
 678         return job_info->link_mapping;
 679 }
 680
 681 static gboolean
 682 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 683                              CacheJobInfo  *job_info,
 684                              gint           page,
 685                              gfloat         scale)
 686 {
 687         EvPageCache *page_cache;
 688         gint width, height;
 689
 690         if (job_info->selection) {
 691                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 692                 ev_page_cache_get_size (page_cache, page, job_info->rc->rotation,
 693                                         scale, &width, &height);
 694
 695                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 696                     height != gdk_pixbuf_get_height (job_info->selection))
 697                         return TRUE;
 698         } else {
 699                 if (job_info->new_points.x1 >= 0)
 700                         return TRUE;
 701         }
 702         return FALSE;
 703 }
 704
 705 static void
 706 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 707                            CacheJobInfo  *job_info,
 708                            gint           page,
 709                            gfloat         scale)
 710 {
 711         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 712                 if (job_info->selection)
 713                         g_object_unref (job_info->selection);
 714                 job_info->selection = NULL;
 715                 job_info->selection_points.x1 = -1;
 716         }
 717 }
 718
 719 GdkRegion *
 720 ev_pixbuf_cache_get_text_mapping      (EvPixbufCache *pixbuf_cache,
 721                                        gint           page)
 722 {
 723         CacheJobInfo *job_info;
 724
 725         job_info = find_job_cache (pixbuf_cache, page);
 726         if (job_info == NULL)
 727                 return NULL;
 728
 729         /* We don't need to wait for the idle to handle the callback */
 730         if (job_info->job &&
 731             EV_JOB (job_info->job)->finished) {
 732                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 733         }
 734
 735         return job_info->text_mapping;
 736 }
 737
 738 /* Clears the cache of jobs and pixbufs.
 739  */
 740 void
 741 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 742 {
 743         int i;
 744
 745         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 746                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 747                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 748         }
 749
 750         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 751                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 752         }
 753 }
 754
 755
 756 void
 757 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 758 {
 759         gint i;
 760
 761         /* FIXME: doesn't update running jobs. */
 762         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 763                 CacheJobInfo *job_info;
 764
 765                 job_info = pixbuf_cache->prev_job + i;
 766                 if (job_info->selection) {
 767                         g_object_unref (G_OBJECT (job_info->selection));
 768                         job_info->selection = NULL;
 769                 }
 770
 771                 job_info = pixbuf_cache->next_job + i;
 772                 if (job_info->selection) {
 773                         g_object_unref (G_OBJECT (job_info->selection));
 774                         job_info->selection = NULL;
 775                 }
 776         }
 777
 778         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 779                 CacheJobInfo *job_info;
 780
 781                 job_info = pixbuf_cache->job_list + i;
 782                 if (job_info->selection) {
 783                         g_object_unref (G_OBJECT (job_info->selection));
 784                         job_info->selection = NULL;
 785                 }
 786         }
 787 }
 788
 789 GdkPixbuf *
 790 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache  *pixbuf_cache,
 791                                       gint            page,
 792                                       gfloat          scale,
 793                                       GdkRegion     **region)
 794 {
 795         CacheJobInfo *job_info;
 796
 797         /* the document does not implement the selection interface */
 798         if (!EV_IS_SELECTION (pixbuf_cache->document))
 799                 return NULL;
 800
 801         job_info = find_job_cache (pixbuf_cache, page);
 802         if (job_info == NULL)
 803                 return NULL;
 804
 805         /* No selection on this page */
 806         if (job_info->new_points.x1 < 0)
 807                 return NULL;
 808
 809         /* Update the rc */
 810         g_assert (job_info->rc);
 811         ev_render_context_set_scale (job_info->rc, scale);
 812
 813         /* If we have a running job, we just return what we have under the
 814          * assumption that it'll be updated later and we can scale it as need
 815          * be */
 816         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 817                 return job_info->selection;
 818
 819         /* Now, lets see if we need to resize the image.  If we do, we clear the
 820          * old one. */
 821         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 822
 823         /* Finally, we see if the two scales are the same, and get a new pixbuf
 824          * if needed.  We do this synchronously for now.  At some point, we
 825          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 826          * doesn't kill us.  Rendering a few glyphs should really be fast.
 827          */
 828         if (ev_rect_cmp (&(job_info->new_points), &(job_info->selection_points))) {
 829                 EvRectangle *old_points;
 830                 GdkColor *text, *base;
 831
 832                 /* we need to get a new selection pixbuf */
 833                 ev_document_doc_mutex_lock ();
 834                 if (job_info->selection_points.x1 < 0) {
 835                         g_assert (job_info->selection == NULL);
 836                         old_points = NULL;
 837                 } else {
 838                         g_assert (job_info->selection != NULL);
 839                         old_points = &(job_info->selection_points);
 840                 }
 841
 842                 if (job_info->selection_region)
 843                         gdk_region_destroy (job_info->selection_region);
 844                 job_info->selection_region =
 845                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 846                                                            job_info->rc,
 847                                                            &(job_info->new_points));
 848
 849                 gtk_widget_ensure_style (pixbuf_cache->view);
 850
 851                 get_selection_colors (pixbuf_cache->view, &text, &base);
 852
 853                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 854                                                job_info->rc, &(job_info->selection),
 855                                                &(job_info->new_points),
 856                                                old_points,
 857                                                text, base);
 858                 job_info->selection_points = job_info->new_points;
 859                 ev_document_doc_mutex_unlock ();
 860         }
 861         if (region)
 862                 *region = job_info->selection_region;
 863         return job_info->selection;
 864 }
 865
 866 static void
 867 update_job_selection (CacheJobInfo    *job_info,
 868                       EvViewSelection *selection)
 869 {
 870         if (job_info->selection == NULL)
 871                 job_info->selection_points.x1 = -1;
 872         job_info->new_points = selection->rect;
 873 }
 874
 875 static void
 876 clear_job_selection (CacheJobInfo *job_info)
 877 {
 878         job_info->selection_points.x1 = -1;
 879         job_info->new_points.x1 = -1;
 880
 881         if (job_info->selection) {
 882                 g_object_unref (job_info->selection);
 883                 job_info->selection = NULL;
 884         }
 885 }
 886
 887 /* This function will reset the selection on pages that no longer have them, and
 888  * will update the target_selection on those that need it.  It will _not_ free
 889  * the previous selection_list -- that's up to caller to do.
 890  */
 891 void
 892 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 893                                     GList         *selection_list)
 894 {
 895         EvPageCache *page_cache;
 896         EvViewSelection *selection;
 897         GList *list = selection_list;
 898         int page;
 899         int i;
 900
 901         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 902
 903         page_cache = ev_page_cache_get (pixbuf_cache->document);
 904
 905         /* We check each area to see what needs updating, and what needs freeing; */
 906         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 907         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 908                 if (page < 0) {
 909                         page ++;
 910                         continue;
 911                 }
 912
 913                 selection = NULL;
 914                 while (list) {
 915                         if (((EvViewSelection *)list->data)->page == page) {
 916                                 selection = list->data;
 917                                 break;
 918                         } else if (((EvViewSelection *)list->data)->page > page)
 919                                 break;
 920                         list = list->next;
 921                 }
 922
 923                 if (selection)
 924                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 925                 else
 926                         clear_job_selection (pixbuf_cache->prev_job + i);
 927                 page ++;
 928         }
 929
 930         page = pixbuf_cache->start_page;
 931         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 932                 selection = NULL;
 933                 while (list) {
 934                         if (((EvViewSelection *)list->data)->page == page) {
 935                                 selection = list->data;
 936                                 break;
 937                         } else if (((EvViewSelection *)list->data)->page > page)
 938                                 break;
 939                         list = list->next;
 940                 }
 941
 942                 if (selection)
 943                         update_job_selection (pixbuf_cache->job_list + i, selection);
 944                 else
 945                         clear_job_selection (pixbuf_cache->job_list + i);
 946                 page ++;
 947         }
 948
 949         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 950                 if (page >= ev_page_cache_get_n_pages (page_cache))
 951                         break;
 952
 953                 selection = NULL;
 954                 while (list) {
 955                         if (((EvViewSelection *)list->data)->page == page) {
 956                                 selection = list->data;
 957                                 break;
 958                         } else if (((EvViewSelection *)list->data)->page > page)
 959                                 break;
 960                         list = list->next;
 961                 }
 962
 963                 if (selection)
 964                         update_job_selection (pixbuf_cache->next_job + i, selection);
 965                 else
 966                         clear_job_selection (pixbuf_cache->next_job + i);
 967                 page ++;
 968         }
 969 }
 970
 971
 972 /* Returns what the pixbuf cache thinks is */
 973
 974 GList *
 975 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
 976 {
 977         EvPageCache *page_cache;
 978         EvViewSelection *selection;
 979         GList *retval = NULL;
 980         int page;
 981         int i;
 982
 983         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
 984
 985         page_cache = ev_page_cache_get (pixbuf_cache->document);
 986
 987         /* We check each area to see what needs updating, and what needs freeing; */
 988         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 989         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 990                 if (page < 0) {
 991                         page ++;
 992                         continue;
 993                 }
 994
 995                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
 996                         selection = g_new0 (EvViewSelection, 1);
 997                         selection->page = page;
 998                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
 999                         if (pixbuf_cache->prev_job[i].selection_region)
1000                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1001                         retval = g_list_append (retval, selection);
1002                 }
1003
1004                 page ++;
1005         }
1006
1007         page = pixbuf_cache->start_page;
1008         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1009                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1010                         selection = g_new0 (EvViewSelection, 1);
1011                         selection->page = page;
1012                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1013                         if (pixbuf_cache->job_list[i].selection_region)
1014                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1015                         retval = g_list_append (retval, selection);
1016                 }
1017
1018                 page ++;
1019         }
1020
1021         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1022                 if (page >= ev_page_cache_get_n_pages (page_cache))
1023                         break;
1024
1025                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1026                         selection = g_new0 (EvViewSelection, 1);
1027                         selection->page = page;
1028                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1029                         if (pixbuf_cache->next_job[i].selection_region)
1030                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1031                         retval = g_list_append (retval, selection);
1032                 }
1033
1034                 page ++;
1035         }
1036
1037         return retval;
1038 }
1039