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 #include "ev-document-images.h"
   6 #include "ev-image.h"
   7
   8 typedef struct _CacheJobInfo
   9 {
  10         EvJob *job;
  11         EvRenderContext *rc;
  12
  13         /* Data we get from rendering */
  14         GdkPixbuf *pixbuf;
  15         GList *link_mapping;
  16         GList *image_mapping;
  17         GdkRegion *text_mapping;
  18
  19         /* Selection data.
  20          * Selection_points are the coordinates encapsulated in selection.
  21          * target_points is the target selection size. */
  22         EvRectangle selection_points;
  23         EvRectangle target_points;
  24         gboolean    points_set;
  25
  26         GdkPixbuf *selection;
  27         GdkRegion *selection_region;
  28 } CacheJobInfo;
  29
  30 struct _EvPixbufCache
  31 {
  32         GObject parent;
  33
  34         /* We keep a link to our containing view just for style information. */
  35         GtkWidget *view;
  36         EvDocument *document;
  37         int start_page;
  38         int end_page;
  39
  40         /* preload_cache_size is the number of pages prior to the current
  41          * visible area that we cache.  It's normally 1, but could be 2 in the
  42          * case of twin pages.
  43          */
  44         int preload_cache_size;
  45         CacheJobInfo *prev_job;
  46         CacheJobInfo *job_list;
  47         CacheJobInfo *next_job;
  48 };
  49
  50 struct _EvPixbufCacheClass
  51 {
  52         GObjectClass parent_class;
  53
  54         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  55 };
  56
  57
  58 enum
  59 {
  60         JOB_FINISHED,
  61         N_SIGNALS,
  62 };
  63
  64 static guint signals[N_SIGNALS] = {0, };
  65
  66 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  67 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  68 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  69 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  70 static void          job_finished_cb            (EvJob              *job,
  71                                                  EvPixbufCache      *pixbuf_cache);
  72 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  73                                                  int                 page);
  74 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  75                                                  CacheJobInfo       *job_info,
  76                                                  EvPixbufCache      *pixbuf_cache);
  77 static gboolean      new_selection_pixbuf_needed(EvPixbufCache      *pixbuf_cache,
  78                                                  CacheJobInfo       *job_info,
  79                                                  gint                page,
  80                                                  gfloat              scale);
  81
  82
  83 /* These are used for iterating through the prev and next arrays */
  84 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  85         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  86 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  87         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  88 #define PAGE_CACHE_LEN(pixbuf_cache) \
  89         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  90
  91 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  92
  93 static void
  94 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  95 {
  96         pixbuf_cache->start_page = 0;
  97         pixbuf_cache->end_page = 0;
  98         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
  99
 100         pixbuf_cache->preload_cache_size = 2;
 101         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 102         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 103 }
 104
 105 static void
 106 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
 107 {
 108         GObjectClass *object_class;
 109
 110         object_class = G_OBJECT_CLASS (class);
 111
 112         object_class->finalize = ev_pixbuf_cache_finalize;
 113         object_class->dispose = ev_pixbuf_cache_dispose;
 114
 115         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 116                                             G_OBJECT_CLASS_TYPE (object_class),
 117                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 118                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 119                                             NULL, NULL,
 120                                             g_cclosure_marshal_VOID__VOID,
 121                                             G_TYPE_NONE, 0);
 122 }
 123
 124 static void
 125 ev_pixbuf_cache_finalize (GObject *object)
 126 {
 127         EvPixbufCache *pixbuf_cache;
 128
 129         pixbuf_cache = EV_PIXBUF_CACHE (object);
 130
 131         g_free (pixbuf_cache->prev_job);
 132         g_free (pixbuf_cache->job_list);
 133         g_free (pixbuf_cache->next_job);
 134 }
 135
 136 static void
 137 dispose_cache_job_info (CacheJobInfo *job_info,
 138                         gpointer      data)
 139 {
 140         if (job_info == NULL)
 141                 return;
 142         if (job_info->job) {
 143                 g_signal_handlers_disconnect_by_func (job_info->job,
 144                                                       G_CALLBACK (job_finished_cb),
 145                                                       data);
 146                 ev_job_queue_remove_job (job_info->job);
 147                 g_object_unref (G_OBJECT (job_info->job));
 148                 job_info->job = NULL;
 149         }
 150         if (job_info->pixbuf) {
 151                 g_object_unref (G_OBJECT (job_info->pixbuf));
 152                 job_info->pixbuf = NULL;
 153         }
 154         if (job_info->link_mapping) {
 155                 ev_link_mapping_free (job_info->link_mapping);
 156                 job_info->link_mapping = NULL;
 157         }
 158         if (job_info->image_mapping) {
 159                 ev_image_mapping_free (job_info->image_mapping);
 160                 job_info->image_mapping = NULL;
 161         }
 162         if (job_info->text_mapping) {
 163                 gdk_region_destroy (job_info->text_mapping);
 164                 job_info->text_mapping = NULL;
 165         }
 166         if (job_info->selection) {
 167                 g_object_unref (G_OBJECT (job_info->selection));
 168                 job_info->selection = NULL;
 169         }
 170         if (job_info->selection_region) {
 171                 gdk_region_destroy (job_info->selection_region);
 172                 job_info->selection_region = NULL;
 173         }
 174         if (job_info->rc) {
 175                 g_object_unref (G_OBJECT (job_info->rc));
 176                 job_info->rc = NULL;
 177         }
 178
 179         job_info->points_set = FALSE;
 180 }
 181
 182 static void
 183 ev_pixbuf_cache_dispose (GObject *object)
 184 {
 185         EvPixbufCache *pixbuf_cache;
 186         int i;
 187
 188         pixbuf_cache = EV_PIXBUF_CACHE (object);
 189
 190         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 191                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 192                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 193         }
 194
 195         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 196                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 197         }
 198 }
 199
 200
 201 EvPixbufCache *
 202 ev_pixbuf_cache_new (GtkWidget  *view,
 203                      EvDocument *document)
 204 {
 205         EvPixbufCache *pixbuf_cache;
 206
 207         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 208         /* This is a backlink, so we don't ref this */
 209         pixbuf_cache->view = view;
 210         pixbuf_cache->document = document;
 211
 212         return pixbuf_cache;
 213 }
 214
 215 static void
 216 job_finished_cb (EvJob         *job,
 217                  EvPixbufCache *pixbuf_cache)
 218 {
 219         CacheJobInfo *job_info;
 220         EvJobRender *job_render = EV_JOB_RENDER (job);
 221
 222         /* If the job is outside of our interest, we silently discard it */
 223         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 224             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 225                 g_object_unref (job);
 226                 return;
 227         }
 228
 229         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 230
 231         copy_job_to_job_info (job_render, job_info, pixbuf_cache);
 232         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 233 }
 234
 235 /* This checks a job to see if the job would generate the right sized pixbuf
 236  * given a scale.  If it won't, it removes the job and clears it to NULL.
 237  */
 238 static void
 239 check_job_size_and_unref (EvPixbufCache *pixbuf_cache,
 240                           CacheJobInfo *job_info,
 241                           EvPageCache  *page_cache,
 242                           gfloat        scale)
 243 {
 244         gint width;
 245         gint height;
 246
 247         g_assert (job_info);
 248
 249         if (job_info->job == NULL)
 250                 return;
 251
 252         ev_page_cache_get_size (page_cache,
 253                                 EV_JOB_RENDER (job_info->job)->rc->page,
 254                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 255                                 scale,
 256                                 &width, &height);
 257
 258         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 259             height == EV_JOB_RENDER (job_info->job)->target_height)
 260                 return;
 261
 262         g_signal_handlers_disconnect_by_func (job_info->job,
 263                                               G_CALLBACK (job_finished_cb),
 264                                               pixbuf_cache);
 265         ev_job_queue_remove_job (job_info->job);
 266         g_object_unref (job_info->job);
 267         job_info->job = NULL;
 268 }
 269
 270 /* Do all function that copies a job from an older cache to it's position in the
 271  * new cache.  It clears the old job if it doesn't have a place.
 272  */
 273 static void
 274 move_one_job (CacheJobInfo  *job_info,
 275               EvPixbufCache *pixbuf_cache,
 276               int            page,
 277               CacheJobInfo  *new_job_list,
 278               CacheJobInfo  *new_prev_job,
 279               CacheJobInfo  *new_next_job,
 280               int            start_page,
 281               int            end_page,
 282               EvJobPriority  priority)
 283 {
 284         CacheJobInfo *target_page = NULL;
 285         int page_offset;
 286         EvJobPriority new_priority;
 287
 288         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 289             page > (end_page + pixbuf_cache->preload_cache_size)) {
 290                 dispose_cache_job_info (job_info, pixbuf_cache);
 291                 return;
 292         }
 293
 294         /* find the target page to copy it over to. */
 295         if (page < start_page) {
 296                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 297
 298                 g_assert (page_offset >= 0 &&
 299                           page_offset < pixbuf_cache->preload_cache_size);
 300                 target_page = new_prev_job + page_offset;
 301                 new_priority = EV_JOB_PRIORITY_LOW;
 302         } else if (page > end_page) {
 303                 page_offset = (page - (end_page + 1));
 304
 305                 g_assert (page_offset >= 0 &&
 306                           page_offset < pixbuf_cache->preload_cache_size);
 307                 target_page = new_next_job + page_offset;
 308                 new_priority = EV_JOB_PRIORITY_LOW;
 309         } else {
 310                 page_offset = page - start_page;
 311                 g_assert (page_offset >= 0 &&
 312                           page_offset <= ((end_page - start_page) + 1));
 313                 new_priority = EV_JOB_PRIORITY_HIGH;
 314                 target_page = new_job_list + page_offset;
 315         }
 316
 317         *target_page = *job_info;
 318         job_info->job = NULL;
 319         job_info->pixbuf = NULL;
 320         job_info->link_mapping = NULL;
 321         job_info->image_mapping = NULL;
 322
 323         if (new_priority != priority && target_page->job) {
 324                 ev_job_queue_update_job (target_page->job, new_priority);
 325         }
 326 }
 327
 328
 329
 330 static void
 331 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 332                               gint           start_page,
 333                               gint           end_page)
 334 {
 335         CacheJobInfo *new_job_list;
 336         CacheJobInfo *new_prev_job;
 337         CacheJobInfo *new_next_job;
 338         EvPageCache *page_cache;
 339         int i, page;
 340
 341         if (pixbuf_cache->start_page == start_page &&
 342             pixbuf_cache->end_page == end_page)
 343                 return;
 344
 345         page_cache = ev_page_cache_get (pixbuf_cache->document);
 346
 347         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 348         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 349         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 350
 351         /* We go through each job in the old cache and either clear it or move
 352          * it to a new location. */
 353
 354         /* Start with the prev cache. */
 355         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 356         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 357                 if (page < 0) {
 358                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 359                 } else {
 360                         move_one_job (pixbuf_cache->prev_job + i,
 361                                       pixbuf_cache, page,
 362                                       new_job_list, new_prev_job, new_next_job,
 363                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 364                 }
 365                 page ++;
 366         }
 367
 368         page = pixbuf_cache->start_page;
 369         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 370                 move_one_job (pixbuf_cache->job_list + i,
 371                               pixbuf_cache, page,
 372                               new_job_list, new_prev_job, new_next_job,
 373                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 374                 page ++;
 375         }
 376
 377         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 378                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 379                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 380                 } else {
 381                         move_one_job (pixbuf_cache->next_job + i,
 382                                       pixbuf_cache, page,
 383                                       new_job_list, new_prev_job, new_next_job,
 384                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 385                 }
 386                 page ++;
 387         }
 388
 389         g_free (pixbuf_cache->job_list);
 390         g_free (pixbuf_cache->prev_job);
 391         g_free (pixbuf_cache->next_job);
 392
 393         pixbuf_cache->job_list = new_job_list;
 394         pixbuf_cache->prev_job = new_prev_job;
 395         pixbuf_cache->next_job = new_next_job;
 396
 397         pixbuf_cache->start_page = start_page;
 398         pixbuf_cache->end_page = end_page;
 399 }
 400
 401 static void
 402 copy_job_to_job_info (EvJobRender   *job_render,
 403                       CacheJobInfo  *job_info,
 404                       EvPixbufCache *pixbuf_cache)
 405 {
 406
 407         job_info->points_set = FALSE;
 408
 409         if (job_info->pixbuf) {
 410                 g_object_unref (G_OBJECT (job_info->pixbuf));
 411         }
 412         job_info->pixbuf = g_object_ref (job_render->pixbuf);
 413
 414         if (job_info->rc) {
 415                 g_object_unref (G_OBJECT (job_info->rc));
 416         }
 417         job_info->rc = g_object_ref (job_render->rc);
 418
 419         if (job_render->include_links) {
 420                 if (job_info->link_mapping)
 421                         ev_link_mapping_free (job_info->link_mapping);
 422                 job_info->link_mapping = job_render->link_mapping;
 423         }
 424
 425         if (job_render->include_images) {
 426                 if (job_info->image_mapping)
 427                         ev_image_mapping_free (job_info->image_mapping);
 428                 job_info->image_mapping = job_render->image_mapping;
 429         }
 430
 431         if (job_render->include_text) {
 432                 if (job_info->text_mapping)
 433                         gdk_region_destroy (job_info->text_mapping);
 434                 job_info->text_mapping = job_render->text_mapping;
 435         }
 436
 437         if (job_render->include_selection) {
 438                 if (job_info->selection) {
 439                         g_object_unref (G_OBJECT (job_info->selection));
 440                         job_info->selection = NULL;
 441                 }
 442                 if (job_info->selection_region) {
 443                         gdk_region_destroy (job_info->selection_region);
 444                         job_info->selection_region = NULL;
 445                 }
 446
 447                 job_info->selection_points = job_render->selection_points;
 448                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 449                 job_info->selection = g_object_ref (job_render->selection);
 450                 g_assert (job_info->selection_points.x1 >= 0);
 451                 job_info->points_set = TRUE;
 452         }
 453
 454         if (job_info->job) {
 455                 g_signal_handlers_disconnect_by_func (job_info->job,
 456                                                       G_CALLBACK (job_finished_cb),
 457                                                       pixbuf_cache);
 458                 ev_job_queue_remove_job (job_info->job);
 459                 g_object_unref (G_OBJECT (job_info->job));
 460                 job_info->job = NULL;
 461         }
 462 }
 463
 464 static CacheJobInfo *
 465 find_job_cache (EvPixbufCache *pixbuf_cache,
 466                 int            page)
 467 {
 468         int page_offset;
 469
 470         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 471             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 472                 return NULL;
 473
 474         if (page < pixbuf_cache->start_page) {
 475                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 476
 477                 g_assert (page_offset >= 0 &&
 478                           page_offset < pixbuf_cache->preload_cache_size);
 479                 return pixbuf_cache->prev_job + page_offset;
 480         }
 481
 482         if (page > pixbuf_cache->end_page) {
 483                 page_offset = (page - (pixbuf_cache->end_page + 1));
 484
 485                 g_assert (page_offset >= 0 &&
 486                           page_offset < pixbuf_cache->preload_cache_size);
 487                 return pixbuf_cache->next_job + page_offset;
 488         }
 489
 490         page_offset = page - pixbuf_cache->start_page;
 491         g_assert (page_offset >= 0 &&
 492                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 493         return pixbuf_cache->job_list + page_offset;
 494 }
 495
 496 static void
 497 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 498                                  gfloat         scale)
 499 {
 500         EvPageCache *page_cache;
 501         int i;
 502
 503         page_cache = ev_page_cache_get (pixbuf_cache->document);
 504
 505         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 506                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->job_list + i, page_cache, scale);
 507         }
 508
 509         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 510                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->prev_job + i, page_cache, scale);
 511                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->next_job + i, page_cache, scale);
 512         }
 513 }
 514
 515 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 516         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 517
 518 static void
 519 get_selection_colors (GtkWidget *widget, GdkColor **text, GdkColor **base)
 520 {
 521     if (GTK_WIDGET_HAS_FOCUS (widget)) {
 522         *text = &widget->style->text [GTK_STATE_SELECTED];
 523         *base = &widget->style->base [GTK_STATE_SELECTED];
 524     } else {
 525         *text = &widget->style->text [GTK_STATE_ACTIVE];
 526         *base = &widget->style->base [GTK_STATE_ACTIVE];
 527     }
 528 }
 529
 530 static void
 531 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 532                    CacheJobInfo  *job_info,
 533                    EvPageCache   *page_cache,
 534                    gint           page,
 535                    gint           rotation,
 536                    gfloat         scale,
 537                    EvJobPriority  priority)
 538 {
 539         gboolean include_links = FALSE;
 540         gboolean include_text = FALSE;
 541         gboolean include_selection = FALSE;
 542         gboolean include_images = FALSE;
 543         int width, height;
 544         GdkColor *text, *base;
 545
 546         if (job_info->job)
 547                 return;
 548
 549         ev_page_cache_get_size (page_cache, page, rotation,
 550                                 scale, &width, &height);
 551
 552         if (job_info->pixbuf &&
 553             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 554             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 555                 return;
 556
 557         /* make a new job now */
 558         if (job_info->rc == NULL) {
 559                 job_info->rc = ev_render_context_new (rotation, page, scale);
 560         } else {
 561                 ev_render_context_set_rotation (job_info->rc, rotation);
 562                 ev_render_context_set_page (job_info->rc, page);
 563                 ev_render_context_set_scale (job_info->rc, scale);
 564         }
 565
 566         /* Figure out what else we need for this job */
 567         if (job_info->link_mapping == NULL)
 568                 include_links = TRUE;
 569         if (job_info->image_mapping == NULL)
 570                 include_images = TRUE;
 571         if (job_info->text_mapping == NULL)
 572                 include_text = TRUE;
 573         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 574                 include_selection = TRUE;
 575         }
 576
 577         gtk_widget_ensure_style (pixbuf_cache->view);
 578
 579         get_selection_colors (pixbuf_cache->view, &text, &base);
 580
 581         job_info->job = ev_job_render_new (pixbuf_cache->document,
 582                                            job_info->rc,
 583                                            width, height,
 584                                            &(job_info->target_points),
 585                                            text, base,
 586                                            include_links,
 587                                            include_images,
 588                                            include_text,
 589                                            include_selection);
 590         ev_job_queue_add_job (job_info->job, priority);
 591         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 592 }
 593
 594
 595 static void
 596 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 597                                     gint           rotation,
 598                                     gfloat         scale)
 599 {
 600         EvPageCache *page_cache;
 601         CacheJobInfo *job_info;
 602         int page;
 603         int i;
 604
 605         page_cache = ev_page_cache_get (pixbuf_cache->document);
 606
 607         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 608                 job_info = (pixbuf_cache->job_list + i);
 609                 page = pixbuf_cache->start_page + i;
 610
 611                 add_job_if_needed (pixbuf_cache, job_info,
 612                                    page_cache, page, rotation, scale,
 613                                    EV_JOB_PRIORITY_HIGH);
 614         }
 615
 616         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 617                 job_info = (pixbuf_cache->prev_job + i);
 618                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 619
 620                 add_job_if_needed (pixbuf_cache, job_info,
 621                                    page_cache, page, rotation, scale,
 622                                    EV_JOB_PRIORITY_LOW);
 623         }
 624
 625         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 626                 job_info = (pixbuf_cache->next_job + i);
 627                 page = pixbuf_cache->end_page + 1 + i;
 628
 629                 add_job_if_needed (pixbuf_cache, job_info,
 630                                    page_cache, page, rotation, scale,
 631                                    EV_JOB_PRIORITY_LOW);
 632         }
 633
 634 }
 635
 636 void
 637 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 638                                 gint            start_page,
 639                                 gint            end_page,
 640                                 gint            rotation,
 641                                 gfloat          scale,
 642                                 GList          *selection_list)
 643 {
 644         EvPageCache *page_cache;
 645
 646         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 647
 648         page_cache = ev_page_cache_get (pixbuf_cache->document);
 649
 650         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 651         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 652         g_return_if_fail (end_page >= start_page);
 653
 654         /* First, resize the page_range as needed.  We cull old pages
 655          * mercilessly. */
 656         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 657
 658         /* Then, we update the current jobs to see if any of them are the wrong
 659          * size, we remove them if we need to. */
 660         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 661
 662         /* Next, we update the target selection for our pages */
 663         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 664
 665         /* Finally, we add the new jobs for all the sizes that don't have a
 666          * pixbuf */
 667         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 668 }
 669
 670 GdkPixbuf *
 671 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 672                             gint           page)
 673 {
 674         CacheJobInfo *job_info;
 675
 676         job_info = find_job_cache (pixbuf_cache, page);
 677         if (job_info == NULL)
 678                 return NULL;
 679
 680         /* We don't need to wait for the idle to handle the callback */
 681         if (job_info->job &&
 682             EV_JOB (job_info->job)->finished) {
 683                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 684                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 685         }
 686
 687         return job_info->pixbuf;
 688 }
 689
 690 GList *
 691 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 692                                   gint           page)
 693 {
 694         CacheJobInfo *job_info;
 695
 696         job_info = find_job_cache (pixbuf_cache, page);
 697         if (job_info == NULL)
 698                 return NULL;
 699
 700         /* We don't need to wait for the idle to handle the callback */
 701         if (job_info->job &&
 702             EV_JOB (job_info->job)->finished) {
 703                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 704                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 705         }
 706
 707         return job_info->link_mapping;
 708 }
 709
 710 GList *
 711 ev_pixbuf_cache_get_image_mapping (EvPixbufCache *pixbuf_cache,
 712                                    gint           page)
 713 {
 714         CacheJobInfo *job_info;
 715
 716         if (!EV_IS_DOCUMENT_IMAGES (pixbuf_cache->document))
 717                 return NULL;
 718
 719         job_info = find_job_cache (pixbuf_cache, page);
 720         if (job_info == NULL)
 721                 return NULL;
 722
 723         /* We don't need to wait for the idle to handle the callback */
 724         if (job_info->job &&
 725             EV_JOB (job_info->job)->finished) {
 726                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 727                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 728         }
 729
 730         return job_info->image_mapping;
 731 }
 732
 733 static gboolean
 734 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 735                              CacheJobInfo  *job_info,
 736                              gint           page,
 737                              gfloat         scale)
 738 {
 739         EvPageCache *page_cache;
 740         gint width, height;
 741
 742         if (job_info->selection) {
 743                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 744                 ev_page_cache_get_size (page_cache, page, job_info->rc->rotation,
 745                                         scale, &width, &height);
 746
 747                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 748                     height != gdk_pixbuf_get_height (job_info->selection))
 749                         return TRUE;
 750         } else {
 751                 if (job_info->points_set)
 752                         return TRUE;
 753         }
 754         return FALSE;
 755 }
 756
 757 static void
 758 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 759                            CacheJobInfo  *job_info,
 760                            gint           page,
 761                            gfloat         scale)
 762 {
 763         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 764                 if (job_info->selection)
 765                         g_object_unref (job_info->selection);
 766                 job_info->selection = NULL;
 767                 job_info->selection_points.x1 = -1;
 768         }
 769 }
 770
 771 GdkRegion *
 772 ev_pixbuf_cache_get_text_mapping (EvPixbufCache *pixbuf_cache,
 773                                   gint           page)
 774 {
 775         CacheJobInfo *job_info;
 776
 777         job_info = find_job_cache (pixbuf_cache, page);
 778         if (job_info == NULL)
 779                 return NULL;
 780
 781         /* We don't need to wait for the idle to handle the callback */
 782         if (job_info->job &&
 783             EV_JOB (job_info->job)->finished) {
 784                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 785                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 786         }
 787
 788         return job_info->text_mapping;
 789 }
 790
 791 /* Clears the cache of jobs and pixbufs.
 792  */
 793 void
 794 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 795 {
 796         int i;
 797
 798         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 799                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 800                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 801         }
 802
 803         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 804                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 805         }
 806 }
 807
 808
 809 void
 810 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 811 {
 812         gint i;
 813
 814         /* FIXME: doesn't update running jobs. */
 815         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 816                 CacheJobInfo *job_info;
 817
 818                 job_info = pixbuf_cache->prev_job + i;
 819                 if (job_info->selection) {
 820                         g_object_unref (G_OBJECT (job_info->selection));
 821                         job_info->selection = NULL;
 822                 }
 823
 824                 job_info = pixbuf_cache->next_job + i;
 825                 if (job_info->selection) {
 826                         g_object_unref (G_OBJECT (job_info->selection));
 827                         job_info->selection = NULL;
 828                 }
 829         }
 830
 831         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 832                 CacheJobInfo *job_info;
 833
 834                 job_info = pixbuf_cache->job_list + i;
 835                 if (job_info->selection) {
 836                         g_object_unref (G_OBJECT (job_info->selection));
 837                         job_info->selection = NULL;
 838                 }
 839         }
 840 }
 841
 842 GdkPixbuf *
 843 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache  *pixbuf_cache,
 844                                       gint            page,
 845                                       gfloat          scale,
 846                                       GdkRegion     **region)
 847 {
 848         CacheJobInfo *job_info;
 849
 850         /* the document does not implement the selection interface */
 851         if (!EV_IS_SELECTION (pixbuf_cache->document))
 852                 return NULL;
 853
 854         job_info = find_job_cache (pixbuf_cache, page);
 855         if (job_info == NULL)
 856                 return NULL;
 857
 858         /* No selection on this page */
 859         if (!job_info->points_set)
 860                 return NULL;
 861
 862         /* Update the rc */
 863         g_assert (job_info->rc);
 864         ev_render_context_set_scale (job_info->rc, scale);
 865
 866         /* If we have a running job, we just return what we have under the
 867          * assumption that it'll be updated later and we can scale it as need
 868          * be */
 869         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 870                 return job_info->selection;
 871
 872         /* Now, lets see if we need to resize the image.  If we do, we clear the
 873          * old one. */
 874         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 875
 876         /* Finally, we see if the two scales are the same, and get a new pixbuf
 877          * if needed.  We do this synchronously for now.  At some point, we
 878          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 879          * doesn't kill us.  Rendering a few glyphs should really be fast.
 880          */
 881         if (ev_rect_cmp (&(job_info->target_points), &(job_info->selection_points))) {
 882                 EvRectangle *old_points;
 883                 GdkColor *text, *base;
 884
 885                 /* we need to get a new selection pixbuf */
 886                 ev_document_doc_mutex_lock ();
 887                 if (job_info->selection_points.x1 < 0) {
 888                         g_assert (job_info->selection == NULL);
 889                         old_points = NULL;
 890                 } else {
 891                         g_assert (job_info->selection != NULL);
 892                         old_points = &(job_info->selection_points);
 893                 }
 894
 895                 if (job_info->selection_region)
 896                         gdk_region_destroy (job_info->selection_region);
 897                 job_info->selection_region =
 898                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 899                                                            job_info->rc,
 900                                                            &(job_info->target_points));
 901
 902                 gtk_widget_ensure_style (pixbuf_cache->view);
 903
 904                 get_selection_colors (pixbuf_cache->view, &text, &base);
 905
 906                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 907                                                job_info->rc, &(job_info->selection),
 908                                                &(job_info->target_points),
 909                                                old_points,
 910                                                text, base);
 911                 job_info->selection_points = job_info->target_points;
 912                 ev_document_doc_mutex_unlock ();
 913         }
 914         if (region)
 915                 *region = job_info->selection_region;
 916         return job_info->selection;
 917 }
 918
 919 static void
 920 update_job_selection (CacheJobInfo    *job_info,
 921                       EvViewSelection *selection)
 922 {
 923         job_info->points_set = TRUE;
 924         job_info->target_points = selection->rect;
 925 }
 926
 927 static void
 928 clear_job_selection (CacheJobInfo *job_info)
 929 {
 930         job_info->points_set = FALSE;
 931         job_info->selection_points.x1 = -1;
 932
 933         if (job_info->selection) {
 934                 g_object_unref (job_info->selection);
 935                 job_info->selection = NULL;
 936         }
 937 }
 938
 939 /* This function will reset the selection on pages that no longer have them, and
 940  * will update the target_selection on those that need it.  It will _not_ free
 941  * the previous selection_list -- that's up to caller to do.
 942  */
 943 void
 944 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 945                                     GList         *selection_list)
 946 {
 947         EvPageCache *page_cache;
 948         EvViewSelection *selection;
 949         GList *list = selection_list;
 950         int page;
 951         int i;
 952
 953         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 954
 955         if (!EV_IS_SELECTION (pixbuf_cache->document))
 956                 return;
 957
 958         page_cache = ev_page_cache_get (pixbuf_cache->document);
 959
 960         /* We check each area to see what needs updating, and what needs freeing; */
 961         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 962         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 963                 if (page < 0) {
 964                         page ++;
 965                         continue;
 966                 }
 967
 968                 selection = NULL;
 969                 while (list) {
 970                         if (((EvViewSelection *)list->data)->page == page) {
 971                                 selection = list->data;
 972                                 break;
 973                         } else if (((EvViewSelection *)list->data)->page > page)
 974                                 break;
 975                         list = list->next;
 976                 }
 977
 978                 if (selection)
 979                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 980                 else
 981                         clear_job_selection (pixbuf_cache->prev_job + i);
 982                 page ++;
 983         }
 984
 985         page = pixbuf_cache->start_page;
 986         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 987                 selection = NULL;
 988                 while (list) {
 989                         if (((EvViewSelection *)list->data)->page == page) {
 990                                 selection = list->data;
 991                                 break;
 992                         } else if (((EvViewSelection *)list->data)->page > page)
 993                                 break;
 994                         list = list->next;
 995                 }
 996
 997                 if (selection)
 998                         update_job_selection (pixbuf_cache->job_list + i, selection);
 999                 else
1000                         clear_job_selection (pixbuf_cache->job_list + i);
1001                 page ++;
1002         }
1003
1004         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1005                 if (page >= ev_page_cache_get_n_pages (page_cache))
1006                         break;
1007
1008                 selection = NULL;
1009                 while (list) {
1010                         if (((EvViewSelection *)list->data)->page == page) {
1011                                 selection = list->data;
1012                                 break;
1013                         } else if (((EvViewSelection *)list->data)->page > page)
1014                                 break;
1015                         list = list->next;
1016                 }
1017
1018                 if (selection)
1019                         update_job_selection (pixbuf_cache->next_job + i, selection);
1020                 else
1021                         clear_job_selection (pixbuf_cache->next_job + i);
1022                 page ++;
1023         }
1024 }
1025
1026
1027 /* Returns what the pixbuf cache thinks is */
1028
1029 GList *
1030 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
1031 {
1032         EvPageCache *page_cache;
1033         EvViewSelection *selection;
1034         GList *retval = NULL;
1035         int page;
1036         int i;
1037
1038         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
1039
1040         page_cache = ev_page_cache_get (pixbuf_cache->document);
1041
1042         /* We check each area to see what needs updating, and what needs freeing; */
1043         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1044         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1045                 if (page < 0) {
1046                         page ++;
1047                         continue;
1048                 }
1049
1050                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
1051                         selection = g_new0 (EvViewSelection, 1);
1052                         selection->page = page;
1053                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
1054                         if (pixbuf_cache->prev_job[i].selection_region)
1055                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1056                         retval = g_list_append (retval, selection);
1057                 }
1058
1059                 page ++;
1060         }
1061
1062         page = pixbuf_cache->start_page;
1063         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1064                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1065                         selection = g_new0 (EvViewSelection, 1);
1066                         selection->page = page;
1067                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1068                         if (pixbuf_cache->job_list[i].selection_region)
1069                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1070                         retval = g_list_append (retval, selection);
1071                 }
1072
1073                 page ++;
1074         }
1075
1076         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1077                 if (page >= ev_page_cache_get_n_pages (page_cache))
1078                         break;
1079
1080                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1081                         selection = g_new0 (EvViewSelection, 1);
1082                         selection->page = page;
1083                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1084                         if (pixbuf_cache->next_job[i].selection_region)
1085                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1086                         retval = g_list_append (retval, selection);
1087                 }
1088
1089                 page ++;
1090         }
1091
1092         return retval;
1093 }
1094