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         cairo_surface_t *surface;
  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         cairo_surface_t *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_surface_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         G_OBJECT_CLASS (ev_pixbuf_cache_parent_class)->finalize (object);
 136 }
 137
 138 static void
 139 dispose_cache_job_info (CacheJobInfo *job_info,
 140                         gpointer      data)
 141 {
 142         if (job_info == NULL)
 143                 return;
 144         if (job_info->job) {
 145                 g_signal_handlers_disconnect_by_func (job_info->job,
 146                                                       G_CALLBACK (job_finished_cb),
 147                                                       data);
 148                 ev_job_queue_remove_job (job_info->job);
 149                 g_object_unref (G_OBJECT (job_info->job));
 150                 job_info->job = NULL;
 151         }
 152         if (job_info->surface) {
 153                 cairo_surface_destroy (job_info->surface);
 154                 job_info->surface = NULL;
 155         }
 156         if (job_info->link_mapping) {
 157                 ev_link_mapping_free (job_info->link_mapping);
 158                 job_info->link_mapping = NULL;
 159         }
 160         if (job_info->image_mapping) {
 161                 ev_image_mapping_free (job_info->image_mapping);
 162                 job_info->image_mapping = NULL;
 163         }
 164         if (job_info->text_mapping) {
 165                 gdk_region_destroy (job_info->text_mapping);
 166                 job_info->text_mapping = NULL;
 167         }
 168         if (job_info->selection) {
 169                 cairo_surface_destroy (job_info->selection);
 170                 job_info->selection = NULL;
 171         }
 172         if (job_info->selection_region) {
 173                 gdk_region_destroy (job_info->selection_region);
 174                 job_info->selection_region = NULL;
 175         }
 176         if (job_info->rc) {
 177                 g_object_unref (G_OBJECT (job_info->rc));
 178                 job_info->rc = NULL;
 179         }
 180
 181         job_info->points_set = FALSE;
 182 }
 183
 184 static void
 185 ev_pixbuf_cache_dispose (GObject *object)
 186 {
 187         EvPixbufCache *pixbuf_cache;
 188         int i;
 189
 190         pixbuf_cache = EV_PIXBUF_CACHE (object);
 191
 192         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 193                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 194                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 195         }
 196
 197         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 198                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 199         }
 200
 201         G_OBJECT_CLASS (ev_pixbuf_cache_parent_class)->dispose (object);
 202 }
 203
 204
 205 EvPixbufCache *
 206 ev_pixbuf_cache_new (GtkWidget  *view,
 207                      EvDocument *document)
 208 {
 209         EvPixbufCache *pixbuf_cache;
 210
 211         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 212         /* This is a backlink, so we don't ref this */
 213         pixbuf_cache->view = view;
 214         pixbuf_cache->document = document;
 215
 216         return pixbuf_cache;
 217 }
 218
 219 static void
 220 job_finished_cb (EvJob         *job,
 221                  EvPixbufCache *pixbuf_cache)
 222 {
 223         CacheJobInfo *job_info;
 224         EvJobRender *job_render = EV_JOB_RENDER (job);
 225
 226         /* If the job is outside of our interest, we silently discard it */
 227         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 228             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 229                 g_object_unref (job);
 230                 return;
 231         }
 232
 233         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 234
 235         copy_job_to_job_info (job_render, job_info, pixbuf_cache);
 236
 237         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 238 }
 239
 240 /* This checks a job to see if the job would generate the right sized pixbuf
 241  * given a scale.  If it won't, it removes the job and clears it to NULL.
 242  */
 243 static void
 244 check_job_size_and_unref (EvPixbufCache *pixbuf_cache,
 245                           CacheJobInfo *job_info,
 246                           EvPageCache  *page_cache,
 247                           gfloat        scale)
 248 {
 249         gint width;
 250         gint height;
 251
 252         g_assert (job_info);
 253
 254         if (job_info->job == NULL)
 255                 return;
 256
 257         ev_page_cache_get_size (page_cache,
 258                                 EV_JOB_RENDER (job_info->job)->rc->page,
 259                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 260                                 scale,
 261                                 &width, &height);
 262
 263         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 264             height == EV_JOB_RENDER (job_info->job)->target_height)
 265                 return;
 266
 267         g_signal_handlers_disconnect_by_func (job_info->job,
 268                                               G_CALLBACK (job_finished_cb),
 269                                               pixbuf_cache);
 270         ev_job_queue_remove_job (job_info->job);
 271         g_object_unref (job_info->job);
 272         job_info->job = NULL;
 273 }
 274
 275 /* Do all function that copies a job from an older cache to it's position in the
 276  * new cache.  It clears the old job if it doesn't have a place.
 277  */
 278 static void
 279 move_one_job (CacheJobInfo  *job_info,
 280               EvPixbufCache *pixbuf_cache,
 281               int            page,
 282               CacheJobInfo  *new_job_list,
 283               CacheJobInfo  *new_prev_job,
 284               CacheJobInfo  *new_next_job,
 285               int            start_page,
 286               int            end_page,
 287               EvJobPriority  priority)
 288 {
 289         CacheJobInfo *target_page = NULL;
 290         int page_offset;
 291         EvJobPriority new_priority;
 292
 293         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 294             page > (end_page + pixbuf_cache->preload_cache_size)) {
 295                 dispose_cache_job_info (job_info, pixbuf_cache);
 296                 return;
 297         }
 298
 299         /* find the target page to copy it over to. */
 300         if (page < start_page) {
 301                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 302
 303                 g_assert (page_offset >= 0 &&
 304                           page_offset < pixbuf_cache->preload_cache_size);
 305                 target_page = new_prev_job + page_offset;
 306                 new_priority = EV_JOB_PRIORITY_LOW;
 307         } else if (page > end_page) {
 308                 page_offset = (page - (end_page + 1));
 309
 310                 g_assert (page_offset >= 0 &&
 311                           page_offset < pixbuf_cache->preload_cache_size);
 312                 target_page = new_next_job + page_offset;
 313                 new_priority = EV_JOB_PRIORITY_LOW;
 314         } else {
 315                 page_offset = page - start_page;
 316                 g_assert (page_offset >= 0 &&
 317                           page_offset <= ((end_page - start_page) + 1));
 318                 new_priority = EV_JOB_PRIORITY_HIGH;
 319                 target_page = new_job_list + page_offset;
 320         }
 321
 322         *target_page = *job_info;
 323         job_info->job = NULL;
 324         job_info->surface = NULL;
 325         job_info->link_mapping = NULL;
 326         job_info->image_mapping = NULL;
 327
 328         if (new_priority != priority && target_page->job) {
 329                 ev_job_queue_update_job (target_page->job, new_priority);
 330         }
 331 }
 332
 333
 334
 335 static void
 336 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 337                               gint           start_page,
 338                               gint           end_page)
 339 {
 340         CacheJobInfo *new_job_list;
 341         CacheJobInfo *new_prev_job;
 342         CacheJobInfo *new_next_job;
 343         EvPageCache *page_cache;
 344         int i, page;
 345
 346         if (pixbuf_cache->start_page == start_page &&
 347             pixbuf_cache->end_page == end_page)
 348                 return;
 349
 350         page_cache = ev_page_cache_get (pixbuf_cache->document);
 351
 352         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 353         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 354         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 355
 356         /* We go through each job in the old cache and either clear it or move
 357          * it to a new location. */
 358
 359         /* Start with the prev cache. */
 360         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 361         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 362                 if (page < 0) {
 363                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 364                 } else {
 365                         move_one_job (pixbuf_cache->prev_job + i,
 366                                       pixbuf_cache, page,
 367                                       new_job_list, new_prev_job, new_next_job,
 368                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 369                 }
 370                 page ++;
 371         }
 372
 373         page = pixbuf_cache->start_page;
 374         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 375                 move_one_job (pixbuf_cache->job_list + i,
 376                               pixbuf_cache, page,
 377                               new_job_list, new_prev_job, new_next_job,
 378                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 379                 page ++;
 380         }
 381
 382         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 383                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 384                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 385                 } else {
 386                         move_one_job (pixbuf_cache->next_job + i,
 387                                       pixbuf_cache, page,
 388                                       new_job_list, new_prev_job, new_next_job,
 389                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 390                 }
 391                 page ++;
 392         }
 393
 394         g_free (pixbuf_cache->job_list);
 395         g_free (pixbuf_cache->prev_job);
 396         g_free (pixbuf_cache->next_job);
 397
 398         pixbuf_cache->job_list = new_job_list;
 399         pixbuf_cache->prev_job = new_prev_job;
 400         pixbuf_cache->next_job = new_next_job;
 401
 402         pixbuf_cache->start_page = start_page;
 403         pixbuf_cache->end_page = end_page;
 404 }
 405
 406 static void
 407 copy_job_to_job_info (EvJobRender   *job_render,
 408                       CacheJobInfo  *job_info,
 409                       EvPixbufCache *pixbuf_cache)
 410 {
 411
 412         job_info->points_set = FALSE;
 413
 414         if (job_info->surface) {
 415                 cairo_surface_destroy (job_info->surface);
 416         }
 417         job_info->surface = cairo_surface_reference (job_render->surface);
 418
 419         if (job_info->rc) {
 420                 g_object_unref (G_OBJECT (job_info->rc));
 421         }
 422         job_info->rc = g_object_ref (job_render->rc);
 423
 424         if (job_render->include_links) {
 425                 if (job_info->link_mapping)
 426                         ev_link_mapping_free (job_info->link_mapping);
 427                 job_info->link_mapping = job_render->link_mapping;
 428         }
 429
 430         if (job_render->include_images) {
 431                 if (job_info->image_mapping)
 432                         ev_image_mapping_free (job_info->image_mapping);
 433                 job_info->image_mapping = job_render->image_mapping;
 434         }
 435
 436         if (job_render->include_text) {
 437                 if (job_info->text_mapping)
 438                         gdk_region_destroy (job_info->text_mapping);
 439                 job_info->text_mapping = job_render->text_mapping;
 440         }
 441
 442         if (job_render->include_selection) {
 443                 if (job_info->selection) {
 444                         cairo_surface_destroy (job_info->selection);
 445                         job_info->selection = NULL;
 446                 }
 447                 if (job_info->selection_region) {
 448                         gdk_region_destroy (job_info->selection_region);
 449                         job_info->selection_region = NULL;
 450                 }
 451
 452                 job_info->selection_points = job_render->selection_points;
 453                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 454                 job_info->selection = cairo_surface_reference (job_render->selection);
 455                 g_assert (job_info->selection_points.x1 >= 0);
 456                 job_info->points_set = TRUE;
 457         }
 458
 459         if (job_info->job) {
 460                 g_signal_handlers_disconnect_by_func (job_info->job,
 461                                                       G_CALLBACK (job_finished_cb),
 462                                                       pixbuf_cache);
 463                 ev_job_queue_remove_job (job_info->job);
 464                 g_object_unref (G_OBJECT (job_info->job));
 465                 job_info->job = NULL;
 466         }
 467 }
 468
 469 static CacheJobInfo *
 470 find_job_cache (EvPixbufCache *pixbuf_cache,
 471                 int            page)
 472 {
 473         int page_offset;
 474
 475         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 476             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 477                 return NULL;
 478
 479         if (page < pixbuf_cache->start_page) {
 480                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 481
 482                 g_assert (page_offset >= 0 &&
 483                           page_offset < pixbuf_cache->preload_cache_size);
 484                 return pixbuf_cache->prev_job + page_offset;
 485         }
 486
 487         if (page > pixbuf_cache->end_page) {
 488                 page_offset = (page - (pixbuf_cache->end_page + 1));
 489
 490                 g_assert (page_offset >= 0 &&
 491                           page_offset < pixbuf_cache->preload_cache_size);
 492                 return pixbuf_cache->next_job + page_offset;
 493         }
 494
 495         page_offset = page - pixbuf_cache->start_page;
 496         g_assert (page_offset >= 0 &&
 497                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 498         return pixbuf_cache->job_list + page_offset;
 499 }
 500
 501 static void
 502 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 503                                  gfloat         scale)
 504 {
 505         EvPageCache *page_cache;
 506         int i;
 507
 508         page_cache = ev_page_cache_get (pixbuf_cache->document);
 509
 510         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 511                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->job_list + i, page_cache, scale);
 512         }
 513
 514         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 515                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->prev_job + i, page_cache, scale);
 516                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->next_job + i, page_cache, scale);
 517         }
 518 }
 519
 520 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 521         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 522
 523 static void
 524 get_selection_colors (GtkWidget *widget, GdkColor **text, GdkColor **base)
 525 {
 526     if (GTK_WIDGET_HAS_FOCUS (widget)) {
 527         *text = &widget->style->text [GTK_STATE_SELECTED];
 528         *base = &widget->style->base [GTK_STATE_SELECTED];
 529     } else {
 530         *text = &widget->style->text [GTK_STATE_ACTIVE];
 531         *base = &widget->style->base [GTK_STATE_ACTIVE];
 532     }
 533 }
 534
 535 static void
 536 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 537                    CacheJobInfo  *job_info,
 538                    EvPageCache   *page_cache,
 539                    gint           page,
 540                    gint           rotation,
 541                    gfloat         scale,
 542                    EvJobPriority  priority)
 543 {
 544         gboolean include_links = FALSE;
 545         gboolean include_text = FALSE;
 546         gboolean include_selection = FALSE;
 547         gboolean include_images = FALSE;
 548         int width, height;
 549         GdkColor *text, *base;
 550
 551         if (job_info->job)
 552                 return;
 553
 554         ev_page_cache_get_size (page_cache, page, rotation,
 555                                 scale, &width, &height);
 556
 557         if (job_info->surface &&
 558             cairo_image_surface_get_width (job_info->surface) == width &&
 559             cairo_image_surface_get_height (job_info->surface) == height)
 560                 return;
 561
 562         /* make a new job now */
 563         if (job_info->rc == NULL) {
 564                 job_info->rc = ev_render_context_new (rotation, page, scale);
 565         } else {
 566                 ev_render_context_set_rotation (job_info->rc, rotation);
 567                 ev_render_context_set_page (job_info->rc, page);
 568                 ev_render_context_set_scale (job_info->rc, scale);
 569         }
 570
 571         /* Figure out what else we need for this job */
 572         if (job_info->link_mapping == NULL)
 573                 include_links = TRUE;
 574         if (job_info->image_mapping == NULL)
 575                 include_images = TRUE;
 576         if (job_info->text_mapping == NULL)
 577                 include_text = TRUE;
 578         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 579                 include_selection = TRUE;
 580         }
 581
 582         gtk_widget_ensure_style (pixbuf_cache->view);
 583
 584         get_selection_colors (pixbuf_cache->view, &text, &base);
 585
 586         job_info->job = ev_job_render_new (pixbuf_cache->document,
 587                                            job_info->rc,
 588                                            width, height,
 589                                            &(job_info->target_points),
 590                                            text, base,
 591                                            include_links,
 592                                            include_images,
 593                                            include_text,
 594                                            include_selection);
 595         ev_job_queue_add_job (job_info->job, priority);
 596         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 597 }
 598
 599
 600 static void
 601 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 602                                     gint           rotation,
 603                                     gfloat         scale)
 604 {
 605         EvPageCache *page_cache;
 606         CacheJobInfo *job_info;
 607         int page;
 608         int i;
 609
 610         page_cache = ev_page_cache_get (pixbuf_cache->document);
 611
 612         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 613                 job_info = (pixbuf_cache->job_list + i);
 614                 page = pixbuf_cache->start_page + i;
 615
 616                 add_job_if_needed (pixbuf_cache, job_info,
 617                                    page_cache, page, rotation, scale,
 618                                    EV_JOB_PRIORITY_HIGH);
 619         }
 620
 621         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 622                 job_info = (pixbuf_cache->prev_job + i);
 623                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 624
 625                 add_job_if_needed (pixbuf_cache, job_info,
 626                                    page_cache, page, rotation, scale,
 627                                    EV_JOB_PRIORITY_LOW);
 628         }
 629
 630         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 631                 job_info = (pixbuf_cache->next_job + i);
 632                 page = pixbuf_cache->end_page + 1 + i;
 633
 634                 add_job_if_needed (pixbuf_cache, job_info,
 635                                    page_cache, page, rotation, scale,
 636                                    EV_JOB_PRIORITY_LOW);
 637         }
 638
 639 }
 640
 641 void
 642 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 643                                 gint            start_page,
 644                                 gint            end_page,
 645                                 gint            rotation,
 646                                 gfloat          scale,
 647                                 GList          *selection_list)
 648 {
 649         EvPageCache *page_cache;
 650
 651         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 652
 653         page_cache = ev_page_cache_get (pixbuf_cache->document);
 654
 655         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 656         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 657         g_return_if_fail (end_page >= start_page);
 658
 659         /* First, resize the page_range as needed.  We cull old pages
 660          * mercilessly. */
 661         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 662
 663         /* Then, we update the current jobs to see if any of them are the wrong
 664          * size, we remove them if we need to. */
 665         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 666
 667         /* Next, we update the target selection for our pages */
 668         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 669
 670         /* Finally, we add the new jobs for all the sizes that don't have a
 671          * pixbuf */
 672         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 673 }
 674
 675 cairo_surface_t *
 676 ev_pixbuf_cache_get_surface (EvPixbufCache *pixbuf_cache,
 677                              gint           page)
 678 {
 679         CacheJobInfo *job_info;
 680
 681         job_info = find_job_cache (pixbuf_cache, page);
 682         if (job_info == NULL)
 683                 return NULL;
 684
 685         /* We don't need to wait for the idle to handle the callback */
 686         if (job_info->job &&
 687             EV_JOB (job_info->job)->finished) {
 688                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 689         }
 690
 691         return job_info->surface;
 692 }
 693
 694 GList *
 695 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 696                                   gint           page)
 697 {
 698         CacheJobInfo *job_info;
 699
 700         job_info = find_job_cache (pixbuf_cache, page);
 701         if (job_info == NULL)
 702                 return NULL;
 703
 704         /* We don't need to wait for the idle to handle the callback */
 705         if (job_info->job &&
 706             EV_JOB (job_info->job)->finished) {
 707                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 708         }
 709
 710         return job_info->link_mapping;
 711 }
 712
 713 GList *
 714 ev_pixbuf_cache_get_image_mapping (EvPixbufCache *pixbuf_cache,
 715                                    gint           page)
 716 {
 717         CacheJobInfo *job_info;
 718
 719         if (!EV_IS_DOCUMENT_IMAGES (pixbuf_cache->document))
 720                 return NULL;
 721
 722         job_info = find_job_cache (pixbuf_cache, page);
 723         if (job_info == NULL)
 724                 return NULL;
 725
 726         /* We don't need to wait for the idle to handle the callback */
 727         if (job_info->job &&
 728             EV_JOB (job_info->job)->finished) {
 729                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 730         }
 731
 732         return job_info->image_mapping;
 733 }
 734
 735 static gboolean
 736 new_selection_surface_needed (EvPixbufCache *pixbuf_cache,
 737                              CacheJobInfo  *job_info,
 738                              gint           page,
 739                              gfloat         scale)
 740 {
 741         EvPageCache *page_cache;
 742
 743         if (job_info->selection) {
 744                 gint width, height;
 745                 gint selection_width, selection_height;
 746
 747                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 748                 ev_page_cache_get_size (page_cache, page,
 749                                         job_info->rc->rotation,
 750                                         scale, &width, &height);
 751
 752                 selection_width = cairo_image_surface_get_width (job_info->selection);
 753                 selection_height = cairo_image_surface_get_height (job_info->selection);
 754
 755                 if (width != selection_width || height != selection_height)
 756                         return TRUE;
 757         } else {
 758                 if (job_info->points_set)
 759                         return TRUE;
 760         }
 761
 762         return FALSE;
 763 }
 764
 765 static void
 766 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 767                            CacheJobInfo  *job_info,
 768                            gint           page,
 769                            gfloat         scale)
 770 {
 771         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 772                 if (job_info->selection)
 773                         cairo_surface_destroy (job_info->selection);
 774                 job_info->selection = NULL;
 775                 job_info->selection_points.x1 = -1;
 776         }
 777 }
 778
 779 GdkRegion *
 780 ev_pixbuf_cache_get_text_mapping (EvPixbufCache *pixbuf_cache,
 781                                   gint           page)
 782 {
 783         CacheJobInfo *job_info;
 784
 785         job_info = find_job_cache (pixbuf_cache, page);
 786         if (job_info == NULL)
 787                 return NULL;
 788
 789         /* We don't need to wait for the idle to handle the callback */
 790         if (job_info->job &&
 791             EV_JOB (job_info->job)->finished) {
 792                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 793         }
 794
 795         return job_info->text_mapping;
 796 }
 797
 798 /* Clears the cache of jobs and pixbufs.
 799  */
 800 void
 801 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 802 {
 803         int i;
 804
 805         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 806                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 807                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 808         }
 809
 810         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 811                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 812         }
 813 }
 814
 815
 816 void
 817 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 818 {
 819         gint i;
 820
 821         /* FIXME: doesn't update running jobs. */
 822         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 823                 CacheJobInfo *job_info;
 824
 825                 job_info = pixbuf_cache->prev_job + i;
 826                 if (job_info->selection) {
 827                         cairo_surface_destroy (job_info->selection);
 828                         job_info->selection = NULL;
 829                 }
 830
 831                 job_info = pixbuf_cache->next_job + i;
 832                 if (job_info->selection) {
 833                         cairo_surface_destroy (job_info->selection);
 834                         job_info->selection = NULL;
 835                 }
 836         }
 837
 838         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 839                 CacheJobInfo *job_info;
 840
 841                 job_info = pixbuf_cache->job_list + i;
 842                 if (job_info->selection) {
 843                         cairo_surface_destroy (job_info->selection);
 844                         job_info->selection = NULL;
 845                 }
 846         }
 847 }
 848
 849 cairo_surface_t *
 850 ev_pixbuf_cache_get_selection_surface (EvPixbufCache  *pixbuf_cache,
 851                                        gint            page,
 852                                        gfloat          scale,
 853                                        GdkRegion     **region)
 854 {
 855         CacheJobInfo *job_info;
 856
 857         /* the document does not implement the selection interface */
 858         if (!EV_IS_SELECTION (pixbuf_cache->document))
 859                 return NULL;
 860
 861         job_info = find_job_cache (pixbuf_cache, page);
 862         if (job_info == NULL)
 863                 return NULL;
 864
 865         /* No selection on this page */
 866         if (!job_info->points_set)
 867                 return NULL;
 868
 869         /* Update the rc */
 870         g_assert (job_info->rc);
 871         ev_render_context_set_scale (job_info->rc, scale);
 872
 873         /* If we have a running job, we just return what we have under the
 874          * assumption that it'll be updated later and we can scale it as need
 875          * be */
 876         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 877                 return job_info->selection;
 878
 879         /* Now, lets see if we need to resize the image.  If we do, we clear the
 880          * old one. */
 881         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 882
 883         /* Finally, we see if the two scales are the same, and get a new pixbuf
 884          * if needed.  We do this synchronously for now.  At some point, we
 885          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 886          * doesn't kill us.  Rendering a few glyphs should really be fast.
 887          */
 888         if (ev_rect_cmp (&(job_info->target_points), &(job_info->selection_points))) {
 889                 EvRectangle *old_points;
 890                 GdkColor *text, *base;
 891
 892                 /* we need to get a new selection pixbuf */
 893                 ev_document_doc_mutex_lock ();
 894                 if (job_info->selection_points.x1 < 0) {
 895                         g_assert (job_info->selection == NULL);
 896                         old_points = NULL;
 897                 } else {
 898                         g_assert (job_info->selection != NULL);
 899                         old_points = &(job_info->selection_points);
 900                 }
 901
 902                 if (job_info->selection_region)
 903                         gdk_region_destroy (job_info->selection_region);
 904                 job_info->selection_region =
 905                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 906                                                            job_info->rc,
 907                                                            &(job_info->target_points));
 908
 909                 gtk_widget_ensure_style (pixbuf_cache->view);
 910
 911                 get_selection_colors (pixbuf_cache->view, &text, &base);
 912
 913                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 914                                                job_info->rc, &(job_info->selection),
 915                                                &(job_info->target_points),
 916                                                old_points,
 917                                                text, base);
 918                 job_info->selection_points = job_info->target_points;
 919                 ev_document_doc_mutex_unlock ();
 920         }
 921         if (region)
 922                 *region = job_info->selection_region;
 923         return job_info->selection;
 924 }
 925
 926 static void
 927 update_job_selection (CacheJobInfo    *job_info,
 928                       EvViewSelection *selection)
 929 {
 930         job_info->points_set = TRUE;
 931         job_info->target_points = selection->rect;
 932 }
 933
 934 static void
 935 clear_job_selection (CacheJobInfo *job_info)
 936 {
 937         job_info->points_set = FALSE;
 938         job_info->selection_points.x1 = -1;
 939
 940         if (job_info->selection) {
 941                 cairo_surface_destroy (job_info->selection);
 942                 job_info->selection = NULL;
 943         }
 944 }
 945
 946 /* This function will reset the selection on pages that no longer have them, and
 947  * will update the target_selection on those that need it.  It will _not_ free
 948  * the previous selection_list -- that's up to caller to do.
 949  */
 950 void
 951 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 952                                     GList         *selection_list)
 953 {
 954         EvPageCache *page_cache;
 955         EvViewSelection *selection;
 956         GList *list = selection_list;
 957         int page;
 958         int i;
 959
 960         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 961
 962         if (!EV_IS_SELECTION (pixbuf_cache->document))
 963                 return;
 964
 965         page_cache = ev_page_cache_get (pixbuf_cache->document);
 966
 967         /* We check each area to see what needs updating, and what needs freeing; */
 968         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 969         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 970                 if (page < 0) {
 971                         page ++;
 972                         continue;
 973                 }
 974
 975                 selection = NULL;
 976                 while (list) {
 977                         if (((EvViewSelection *)list->data)->page == page) {
 978                                 selection = list->data;
 979                                 break;
 980                         } else if (((EvViewSelection *)list->data)->page > page)
 981                                 break;
 982                         list = list->next;
 983                 }
 984
 985                 if (selection)
 986                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 987                 else
 988                         clear_job_selection (pixbuf_cache->prev_job + i);
 989                 page ++;
 990         }
 991
 992         page = pixbuf_cache->start_page;
 993         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 994                 selection = NULL;
 995                 while (list) {
 996                         if (((EvViewSelection *)list->data)->page == page) {
 997                                 selection = list->data;
 998                                 break;
 999                         } else if (((EvViewSelection *)list->data)->page > page)
1000                                 break;
1001                         list = list->next;
1002                 }
1003
1004                 if (selection)
1005                         update_job_selection (pixbuf_cache->job_list + i, selection);
1006                 else
1007                         clear_job_selection (pixbuf_cache->job_list + i);
1008                 page ++;
1009         }
1010
1011         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1012                 if (page >= ev_page_cache_get_n_pages (page_cache))
1013                         break;
1014
1015                 selection = NULL;
1016                 while (list) {
1017                         if (((EvViewSelection *)list->data)->page == page) {
1018                                 selection = list->data;
1019                                 break;
1020                         } else if (((EvViewSelection *)list->data)->page > page)
1021                                 break;
1022                         list = list->next;
1023                 }
1024
1025                 if (selection)
1026                         update_job_selection (pixbuf_cache->next_job + i, selection);
1027                 else
1028                         clear_job_selection (pixbuf_cache->next_job + i);
1029                 page ++;
1030         }
1031 }
1032
1033
1034 /* Returns what the pixbuf cache thinks is */
1035
1036 GList *
1037 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
1038 {
1039         EvPageCache *page_cache;
1040         EvViewSelection *selection;
1041         GList *retval = NULL;
1042         int page;
1043         int i;
1044
1045         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
1046
1047         page_cache = ev_page_cache_get (pixbuf_cache->document);
1048
1049         /* We check each area to see what needs updating, and what needs freeing; */
1050         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1051         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1052                 if (page < 0) {
1053                         page ++;
1054                         continue;
1055                 }
1056
1057                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
1058                         selection = g_new0 (EvViewSelection, 1);
1059                         selection->page = page;
1060                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
1061                         if (pixbuf_cache->prev_job[i].selection_region)
1062                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1063                         retval = g_list_append (retval, selection);
1064                 }
1065
1066                 page ++;
1067         }
1068
1069         page = pixbuf_cache->start_page;
1070         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1071                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1072                         selection = g_new0 (EvViewSelection, 1);
1073                         selection->page = page;
1074                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1075                         if (pixbuf_cache->job_list[i].selection_region)
1076                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1077                         retval = g_list_append (retval, selection);
1078                 }
1079
1080                 page ++;
1081         }
1082
1083         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1084                 if (page >= ev_page_cache_get_n_pages (page_cache))
1085                         break;
1086
1087                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1088                         selection = g_new0 (EvViewSelection, 1);
1089                         selection->page = page;
1090                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1091                         if (pixbuf_cache->next_job[i].selection_region)
1092                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1093                         retval = g_list_append (retval, selection);
1094                 }
1095
1096                 page ++;
1097         }
1098
1099         return retval;
1100 }
1101