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
 233         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 234 }
 235
 236 /* This checks a job to see if the job would generate the right sized pixbuf
 237  * given a scale.  If it won't, it removes the job and clears it to NULL.
 238  */
 239 static void
 240 check_job_size_and_unref (EvPixbufCache *pixbuf_cache,
 241                           CacheJobInfo *job_info,
 242                           EvPageCache  *page_cache,
 243                           gfloat        scale)
 244 {
 245         gint width;
 246         gint height;
 247
 248         g_assert (job_info);
 249
 250         if (job_info->job == NULL)
 251                 return;
 252
 253         ev_page_cache_get_size (page_cache,
 254                                 EV_JOB_RENDER (job_info->job)->rc->page,
 255                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 256                                 scale,
 257                                 &width, &height);
 258
 259         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 260             height == EV_JOB_RENDER (job_info->job)->target_height)
 261                 return;
 262
 263         g_signal_handlers_disconnect_by_func (job_info->job,
 264                                               G_CALLBACK (job_finished_cb),
 265                                               pixbuf_cache);
 266         ev_job_queue_remove_job (job_info->job);
 267         g_object_unref (job_info->job);
 268         job_info->job = NULL;
 269 }
 270
 271 /* Do all function that copies a job from an older cache to it's position in the
 272  * new cache.  It clears the old job if it doesn't have a place.
 273  */
 274 static void
 275 move_one_job (CacheJobInfo  *job_info,
 276               EvPixbufCache *pixbuf_cache,
 277               int            page,
 278               CacheJobInfo  *new_job_list,
 279               CacheJobInfo  *new_prev_job,
 280               CacheJobInfo  *new_next_job,
 281               int            start_page,
 282               int            end_page,
 283               EvJobPriority  priority)
 284 {
 285         CacheJobInfo *target_page = NULL;
 286         int page_offset;
 287         EvJobPriority new_priority;
 288
 289         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 290             page > (end_page + pixbuf_cache->preload_cache_size)) {
 291                 dispose_cache_job_info (job_info, pixbuf_cache);
 292                 return;
 293         }
 294
 295         /* find the target page to copy it over to. */
 296         if (page < start_page) {
 297                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 298
 299                 g_assert (page_offset >= 0 &&
 300                           page_offset < pixbuf_cache->preload_cache_size);
 301                 target_page = new_prev_job + page_offset;
 302                 new_priority = EV_JOB_PRIORITY_LOW;
 303         } else if (page > end_page) {
 304                 page_offset = (page - (end_page + 1));
 305
 306                 g_assert (page_offset >= 0 &&
 307                           page_offset < pixbuf_cache->preload_cache_size);
 308                 target_page = new_next_job + page_offset;
 309                 new_priority = EV_JOB_PRIORITY_LOW;
 310         } else {
 311                 page_offset = page - start_page;
 312                 g_assert (page_offset >= 0 &&
 313                           page_offset <= ((end_page - start_page) + 1));
 314                 new_priority = EV_JOB_PRIORITY_HIGH;
 315                 target_page = new_job_list + page_offset;
 316         }
 317
 318         *target_page = *job_info;
 319         job_info->job = NULL;
 320         job_info->pixbuf = NULL;
 321         job_info->link_mapping = NULL;
 322         job_info->image_mapping = NULL;
 323
 324         if (new_priority != priority && target_page->job) {
 325                 ev_job_queue_update_job (target_page->job, new_priority);
 326         }
 327 }
 328
 329
 330
 331 static void
 332 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 333                               gint           start_page,
 334                               gint           end_page)
 335 {
 336         CacheJobInfo *new_job_list;
 337         CacheJobInfo *new_prev_job;
 338         CacheJobInfo *new_next_job;
 339         EvPageCache *page_cache;
 340         int i, page;
 341
 342         if (pixbuf_cache->start_page == start_page &&
 343             pixbuf_cache->end_page == end_page)
 344                 return;
 345
 346         page_cache = ev_page_cache_get (pixbuf_cache->document);
 347
 348         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 349         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 350         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 351
 352         /* We go through each job in the old cache and either clear it or move
 353          * it to a new location. */
 354
 355         /* Start with the prev cache. */
 356         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 357         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 358                 if (page < 0) {
 359                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 360                 } else {
 361                         move_one_job (pixbuf_cache->prev_job + i,
 362                                       pixbuf_cache, page,
 363                                       new_job_list, new_prev_job, new_next_job,
 364                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 365                 }
 366                 page ++;
 367         }
 368
 369         page = pixbuf_cache->start_page;
 370         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 371                 move_one_job (pixbuf_cache->job_list + i,
 372                               pixbuf_cache, page,
 373                               new_job_list, new_prev_job, new_next_job,
 374                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 375                 page ++;
 376         }
 377
 378         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 379                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 380                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 381                 } else {
 382                         move_one_job (pixbuf_cache->next_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         g_free (pixbuf_cache->job_list);
 391         g_free (pixbuf_cache->prev_job);
 392         g_free (pixbuf_cache->next_job);
 393
 394         pixbuf_cache->job_list = new_job_list;
 395         pixbuf_cache->prev_job = new_prev_job;
 396         pixbuf_cache->next_job = new_next_job;
 397
 398         pixbuf_cache->start_page = start_page;
 399         pixbuf_cache->end_page = end_page;
 400 }
 401
 402 static void
 403 copy_job_to_job_info (EvJobRender   *job_render,
 404                       CacheJobInfo  *job_info,
 405                       EvPixbufCache *pixbuf_cache)
 406 {
 407
 408         job_info->points_set = FALSE;
 409
 410         if (job_info->pixbuf) {
 411                 g_object_unref (G_OBJECT (job_info->pixbuf));
 412         }
 413         job_info->pixbuf = g_object_ref (job_render->pixbuf);
 414
 415         if (job_info->rc) {
 416                 g_object_unref (G_OBJECT (job_info->rc));
 417         }
 418         job_info->rc = g_object_ref (job_render->rc);
 419
 420         if (job_render->include_links) {
 421                 if (job_info->link_mapping)
 422                         ev_link_mapping_free (job_info->link_mapping);
 423                 job_info->link_mapping = job_render->link_mapping;
 424         }
 425
 426         if (job_render->include_images) {
 427                 if (job_info->image_mapping)
 428                         ev_image_mapping_free (job_info->image_mapping);
 429                 job_info->image_mapping = job_render->image_mapping;
 430         }
 431
 432         if (job_render->include_text) {
 433                 if (job_info->text_mapping)
 434                         gdk_region_destroy (job_info->text_mapping);
 435                 job_info->text_mapping = job_render->text_mapping;
 436         }
 437
 438         if (job_render->include_selection) {
 439                 if (job_info->selection) {
 440                         g_object_unref (G_OBJECT (job_info->selection));
 441                         job_info->selection = NULL;
 442                 }
 443                 if (job_info->selection_region) {
 444                         gdk_region_destroy (job_info->selection_region);
 445                         job_info->selection_region = NULL;
 446                 }
 447
 448                 job_info->selection_points = job_render->selection_points;
 449                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 450                 job_info->selection = g_object_ref (job_render->selection);
 451                 g_assert (job_info->selection_points.x1 >= 0);
 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         }
 685
 686         return job_info->pixbuf;
 687 }
 688
 689 GList *
 690 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 691                                   gint           page)
 692 {
 693         CacheJobInfo *job_info;
 694
 695         job_info = find_job_cache (pixbuf_cache, page);
 696         if (job_info == NULL)
 697                 return NULL;
 698
 699         /* We don't need to wait for the idle to handle the callback */
 700         if (job_info->job &&
 701             EV_JOB (job_info->job)->finished) {
 702                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 703         }
 704
 705         return job_info->link_mapping;
 706 }
 707
 708 GList *
 709 ev_pixbuf_cache_get_image_mapping (EvPixbufCache *pixbuf_cache,
 710                                    gint           page)
 711 {
 712         CacheJobInfo *job_info;
 713
 714         if (!EV_IS_DOCUMENT_IMAGES (pixbuf_cache->document))
 715                 return NULL;
 716
 717         job_info = find_job_cache (pixbuf_cache, page);
 718         if (job_info == NULL)
 719                 return NULL;
 720
 721         /* We don't need to wait for the idle to handle the callback */
 722         if (job_info->job &&
 723             EV_JOB (job_info->job)->finished) {
 724                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 725         }
 726
 727         return job_info->image_mapping;
 728 }
 729
 730 static gboolean
 731 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 732                              CacheJobInfo  *job_info,
 733                              gint           page,
 734                              gfloat         scale)
 735 {
 736         EvPageCache *page_cache;
 737         gint width, height;
 738
 739         if (job_info->selection) {
 740                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 741                 ev_page_cache_get_size (page_cache, page, job_info->rc->rotation,
 742                                         scale, &width, &height);
 743
 744                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 745                     height != gdk_pixbuf_get_height (job_info->selection))
 746                         return TRUE;
 747         } else {
 748                 if (job_info->points_set)
 749                         return TRUE;
 750         }
 751         return FALSE;
 752 }
 753
 754 static void
 755 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 756                            CacheJobInfo  *job_info,
 757                            gint           page,
 758                            gfloat         scale)
 759 {
 760         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 761                 if (job_info->selection)
 762                         g_object_unref (job_info->selection);
 763                 job_info->selection = NULL;
 764                 job_info->selection_points.x1 = -1;
 765         }
 766 }
 767
 768 GdkRegion *
 769 ev_pixbuf_cache_get_text_mapping (EvPixbufCache *pixbuf_cache,
 770                                   gint           page)
 771 {
 772         CacheJobInfo *job_info;
 773
 774         job_info = find_job_cache (pixbuf_cache, page);
 775         if (job_info == NULL)
 776                 return NULL;
 777
 778         /* We don't need to wait for the idle to handle the callback */
 779         if (job_info->job &&
 780             EV_JOB (job_info->job)->finished) {
 781                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 782         }
 783
 784         return job_info->text_mapping;
 785 }
 786
 787 /* Clears the cache of jobs and pixbufs.
 788  */
 789 void
 790 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 791 {
 792         int i;
 793
 794         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 795                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 796                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 797         }
 798
 799         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 800                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 801         }
 802 }
 803
 804
 805 void
 806 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 807 {
 808         gint i;
 809
 810         /* FIXME: doesn't update running jobs. */
 811         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 812                 CacheJobInfo *job_info;
 813
 814                 job_info = pixbuf_cache->prev_job + i;
 815                 if (job_info->selection) {
 816                         g_object_unref (G_OBJECT (job_info->selection));
 817                         job_info->selection = NULL;
 818                 }
 819
 820                 job_info = pixbuf_cache->next_job + i;
 821                 if (job_info->selection) {
 822                         g_object_unref (G_OBJECT (job_info->selection));
 823                         job_info->selection = NULL;
 824                 }
 825         }
 826
 827         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 828                 CacheJobInfo *job_info;
 829
 830                 job_info = pixbuf_cache->job_list + i;
 831                 if (job_info->selection) {
 832                         g_object_unref (G_OBJECT (job_info->selection));
 833                         job_info->selection = NULL;
 834                 }
 835         }
 836 }
 837
 838 GdkPixbuf *
 839 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache  *pixbuf_cache,
 840                                       gint            page,
 841                                       gfloat          scale,
 842                                       GdkRegion     **region)
 843 {
 844         CacheJobInfo *job_info;
 845
 846         /* the document does not implement the selection interface */
 847         if (!EV_IS_SELECTION (pixbuf_cache->document))
 848                 return NULL;
 849
 850         job_info = find_job_cache (pixbuf_cache, page);
 851         if (job_info == NULL)
 852                 return NULL;
 853
 854         /* No selection on this page */
 855         if (!job_info->points_set)
 856                 return NULL;
 857
 858         /* Update the rc */
 859         g_assert (job_info->rc);
 860         ev_render_context_set_scale (job_info->rc, scale);
 861
 862         /* If we have a running job, we just return what we have under the
 863          * assumption that it'll be updated later and we can scale it as need
 864          * be */
 865         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 866                 return job_info->selection;
 867
 868         /* Now, lets see if we need to resize the image.  If we do, we clear the
 869          * old one. */
 870         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 871
 872         /* Finally, we see if the two scales are the same, and get a new pixbuf
 873          * if needed.  We do this synchronously for now.  At some point, we
 874          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 875          * doesn't kill us.  Rendering a few glyphs should really be fast.
 876          */
 877         if (ev_rect_cmp (&(job_info->target_points), &(job_info->selection_points))) {
 878                 EvRectangle *old_points;
 879                 GdkColor *text, *base;
 880
 881                 /* we need to get a new selection pixbuf */
 882                 ev_document_doc_mutex_lock ();
 883                 if (job_info->selection_points.x1 < 0) {
 884                         g_assert (job_info->selection == NULL);
 885                         old_points = NULL;
 886                 } else {
 887                         g_assert (job_info->selection != NULL);
 888                         old_points = &(job_info->selection_points);
 889                 }
 890
 891                 if (job_info->selection_region)
 892                         gdk_region_destroy (job_info->selection_region);
 893                 job_info->selection_region =
 894                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 895                                                            job_info->rc,
 896                                                            &(job_info->target_points));
 897
 898                 gtk_widget_ensure_style (pixbuf_cache->view);
 899
 900                 get_selection_colors (pixbuf_cache->view, &text, &base);
 901
 902                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 903                                                job_info->rc, &(job_info->selection),
 904                                                &(job_info->target_points),
 905                                                old_points,
 906                                                text, base);
 907                 job_info->selection_points = job_info->target_points;
 908                 ev_document_doc_mutex_unlock ();
 909         }
 910         if (region)
 911                 *region = job_info->selection_region;
 912         return job_info->selection;
 913 }
 914
 915 static void
 916 update_job_selection (CacheJobInfo    *job_info,
 917                       EvViewSelection *selection)
 918 {
 919         job_info->points_set = TRUE;
 920         job_info->target_points = selection->rect;
 921 }
 922
 923 static void
 924 clear_job_selection (CacheJobInfo *job_info)
 925 {
 926         job_info->points_set = FALSE;
 927         job_info->selection_points.x1 = -1;
 928
 929         if (job_info->selection) {
 930                 g_object_unref (job_info->selection);
 931                 job_info->selection = NULL;
 932         }
 933 }
 934
 935 /* This function will reset the selection on pages that no longer have them, and
 936  * will update the target_selection on those that need it.  It will _not_ free
 937  * the previous selection_list -- that's up to caller to do.
 938  */
 939 void
 940 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 941                                     GList         *selection_list)
 942 {
 943         EvPageCache *page_cache;
 944         EvViewSelection *selection;
 945         GList *list = selection_list;
 946         int page;
 947         int i;
 948
 949         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 950
 951         if (!EV_IS_SELECTION (pixbuf_cache->document))
 952                 return;
 953
 954         page_cache = ev_page_cache_get (pixbuf_cache->document);
 955
 956         /* We check each area to see what needs updating, and what needs freeing; */
 957         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 958         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 959                 if (page < 0) {
 960                         page ++;
 961                         continue;
 962                 }
 963
 964                 selection = NULL;
 965                 while (list) {
 966                         if (((EvViewSelection *)list->data)->page == page) {
 967                                 selection = list->data;
 968                                 break;
 969                         } else if (((EvViewSelection *)list->data)->page > page)
 970                                 break;
 971                         list = list->next;
 972                 }
 973
 974                 if (selection)
 975                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 976                 else
 977                         clear_job_selection (pixbuf_cache->prev_job + i);
 978                 page ++;
 979         }
 980
 981         page = pixbuf_cache->start_page;
 982         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 983                 selection = NULL;
 984                 while (list) {
 985                         if (((EvViewSelection *)list->data)->page == page) {
 986                                 selection = list->data;
 987                                 break;
 988                         } else if (((EvViewSelection *)list->data)->page > page)
 989                                 break;
 990                         list = list->next;
 991                 }
 992
 993                 if (selection)
 994                         update_job_selection (pixbuf_cache->job_list + i, selection);
 995                 else
 996                         clear_job_selection (pixbuf_cache->job_list + i);
 997                 page ++;
 998         }
 999
1000         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1001                 if (page >= ev_page_cache_get_n_pages (page_cache))
1002                         break;
1003
1004                 selection = NULL;
1005                 while (list) {
1006                         if (((EvViewSelection *)list->data)->page == page) {
1007                                 selection = list->data;
1008                                 break;
1009                         } else if (((EvViewSelection *)list->data)->page > page)
1010                                 break;
1011                         list = list->next;
1012                 }
1013
1014                 if (selection)
1015                         update_job_selection (pixbuf_cache->next_job + i, selection);
1016                 else
1017                         clear_job_selection (pixbuf_cache->next_job + i);
1018                 page ++;
1019         }
1020 }
1021
1022
1023 /* Returns what the pixbuf cache thinks is */
1024
1025 GList *
1026 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
1027 {
1028         EvPageCache *page_cache;
1029         EvViewSelection *selection;
1030         GList *retval = NULL;
1031         int page;
1032         int i;
1033
1034         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
1035
1036         page_cache = ev_page_cache_get (pixbuf_cache->document);
1037
1038         /* We check each area to see what needs updating, and what needs freeing; */
1039         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1040         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1041                 if (page < 0) {
1042                         page ++;
1043                         continue;
1044                 }
1045
1046                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
1047                         selection = g_new0 (EvViewSelection, 1);
1048                         selection->page = page;
1049                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
1050                         if (pixbuf_cache->prev_job[i].selection_region)
1051                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1052                         retval = g_list_append (retval, selection);
1053                 }
1054
1055                 page ++;
1056         }
1057
1058         page = pixbuf_cache->start_page;
1059         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1060                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1061                         selection = g_new0 (EvViewSelection, 1);
1062                         selection->page = page;
1063                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1064                         if (pixbuf_cache->job_list[i].selection_region)
1065                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1066                         retval = g_list_append (retval, selection);
1067                 }
1068
1069                 page ++;
1070         }
1071
1072         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1073                 if (page >= ev_page_cache_get_n_pages (page_cache))
1074                         break;
1075
1076                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1077                         selection = g_new0 (EvViewSelection, 1);
1078                         selection->page = page;
1079                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1080                         if (pixbuf_cache->next_job[i].selection_region)
1081                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1082                         retval = g_list_append (retval, selection);
1083                 }
1084
1085                 page ++;
1086         }
1087
1088         return retval;
1089 }
1090