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         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 237 }
 238
 239 /* This checks a job to see if the job would generate the right sized pixbuf
 240  * given a scale.  If it won't, it removes the job and clears it to NULL.
 241  */
 242 static void
 243 check_job_size_and_unref (EvPixbufCache *pixbuf_cache,
 244                           CacheJobInfo *job_info,
 245                           EvPageCache  *page_cache,
 246                           gfloat        scale)
 247 {
 248         gint width;
 249         gint height;
 250
 251         g_assert (job_info);
 252
 253         if (job_info->job == NULL)
 254                 return;
 255
 256         ev_page_cache_get_size (page_cache,
 257                                 EV_JOB_RENDER (job_info->job)->rc->page,
 258                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 259                                 scale,
 260                                 &width, &height);
 261
 262         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 263             height == EV_JOB_RENDER (job_info->job)->target_height)
 264                 return;
 265
 266         g_signal_handlers_disconnect_by_func (job_info->job,
 267                                               G_CALLBACK (job_finished_cb),
 268                                               pixbuf_cache);
 269         ev_job_queue_remove_job (job_info->job);
 270         g_object_unref (job_info->job);
 271         job_info->job = NULL;
 272 }
 273
 274 /* Do all function that copies a job from an older cache to it's position in the
 275  * new cache.  It clears the old job if it doesn't have a place.
 276  */
 277 static void
 278 move_one_job (CacheJobInfo  *job_info,
 279               EvPixbufCache *pixbuf_cache,
 280               int            page,
 281               CacheJobInfo  *new_job_list,
 282               CacheJobInfo  *new_prev_job,
 283               CacheJobInfo  *new_next_job,
 284               int            start_page,
 285               int            end_page,
 286               EvJobPriority  priority)
 287 {
 288         CacheJobInfo *target_page = NULL;
 289         int page_offset;
 290         EvJobPriority new_priority;
 291
 292         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 293             page > (end_page + pixbuf_cache->preload_cache_size)) {
 294                 dispose_cache_job_info (job_info, pixbuf_cache);
 295                 return;
 296         }
 297
 298         /* find the target page to copy it over to. */
 299         if (page < start_page) {
 300                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 301
 302                 g_assert (page_offset >= 0 &&
 303                           page_offset < pixbuf_cache->preload_cache_size);
 304                 target_page = new_prev_job + page_offset;
 305                 new_priority = EV_JOB_PRIORITY_LOW;
 306         } else if (page > end_page) {
 307                 page_offset = (page - (end_page + 1));
 308
 309                 g_assert (page_offset >= 0 &&
 310                           page_offset < pixbuf_cache->preload_cache_size);
 311                 target_page = new_next_job + page_offset;
 312                 new_priority = EV_JOB_PRIORITY_LOW;
 313         } else {
 314                 page_offset = page - start_page;
 315                 g_assert (page_offset >= 0 &&
 316                           page_offset <= ((end_page - start_page) + 1));
 317                 new_priority = EV_JOB_PRIORITY_HIGH;
 318                 target_page = new_job_list + page_offset;
 319         }
 320
 321         *target_page = *job_info;
 322         job_info->job = NULL;
 323         job_info->surface = NULL;
 324         job_info->link_mapping = NULL;
 325         job_info->image_mapping = NULL;
 326
 327         if (new_priority != priority && target_page->job) {
 328                 ev_job_queue_update_job (target_page->job, new_priority);
 329         }
 330 }
 331
 332
 333
 334 static void
 335 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 336                               gint           start_page,
 337                               gint           end_page)
 338 {
 339         CacheJobInfo *new_job_list;
 340         CacheJobInfo *new_prev_job;
 341         CacheJobInfo *new_next_job;
 342         EvPageCache *page_cache;
 343         int i, page;
 344
 345         if (pixbuf_cache->start_page == start_page &&
 346             pixbuf_cache->end_page == end_page)
 347                 return;
 348
 349         page_cache = ev_page_cache_get (pixbuf_cache->document);
 350
 351         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 352         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 353         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 354
 355         /* We go through each job in the old cache and either clear it or move
 356          * it to a new location. */
 357
 358         /* Start with the prev cache. */
 359         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 360         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 361                 if (page < 0) {
 362                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 363                 } else {
 364                         move_one_job (pixbuf_cache->prev_job + i,
 365                                       pixbuf_cache, page,
 366                                       new_job_list, new_prev_job, new_next_job,
 367                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 368                 }
 369                 page ++;
 370         }
 371
 372         page = pixbuf_cache->start_page;
 373         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 374                 move_one_job (pixbuf_cache->job_list + i,
 375                               pixbuf_cache, page,
 376                               new_job_list, new_prev_job, new_next_job,
 377                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 378                 page ++;
 379         }
 380
 381         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 382                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 383                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 384                 } else {
 385                         move_one_job (pixbuf_cache->next_job + i,
 386                                       pixbuf_cache, page,
 387                                       new_job_list, new_prev_job, new_next_job,
 388                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 389                 }
 390                 page ++;
 391         }
 392
 393         g_free (pixbuf_cache->job_list);
 394         g_free (pixbuf_cache->prev_job);
 395         g_free (pixbuf_cache->next_job);
 396
 397         pixbuf_cache->job_list = new_job_list;
 398         pixbuf_cache->prev_job = new_prev_job;
 399         pixbuf_cache->next_job = new_next_job;
 400
 401         pixbuf_cache->start_page = start_page;
 402         pixbuf_cache->end_page = end_page;
 403 }
 404
 405 static void
 406 copy_job_to_job_info (EvJobRender   *job_render,
 407                       CacheJobInfo  *job_info,
 408                       EvPixbufCache *pixbuf_cache)
 409 {
 410
 411         job_info->points_set = FALSE;
 412
 413         if (job_info->surface) {
 414                 cairo_surface_destroy (job_info->surface);
 415         }
 416         job_info->surface = cairo_surface_reference (job_render->surface);
 417
 418         if (job_info->rc) {
 419                 g_object_unref (G_OBJECT (job_info->rc));
 420         }
 421         job_info->rc = g_object_ref (job_render->rc);
 422
 423         if (job_render->include_links) {
 424                 if (job_info->link_mapping)
 425                         ev_link_mapping_free (job_info->link_mapping);
 426                 job_info->link_mapping = job_render->link_mapping;
 427         }
 428
 429         if (job_render->include_images) {
 430                 if (job_info->image_mapping)
 431                         ev_image_mapping_free (job_info->image_mapping);
 432                 job_info->image_mapping = job_render->image_mapping;
 433         }
 434
 435         if (job_render->include_text) {
 436                 if (job_info->text_mapping)
 437                         gdk_region_destroy (job_info->text_mapping);
 438                 job_info->text_mapping = job_render->text_mapping;
 439         }
 440
 441         if (job_render->include_selection) {
 442                 if (job_info->selection) {
 443                         cairo_surface_destroy (job_info->selection);
 444                         job_info->selection = NULL;
 445                 }
 446                 if (job_info->selection_region) {
 447                         gdk_region_destroy (job_info->selection_region);
 448                         job_info->selection_region = NULL;
 449                 }
 450
 451                 job_info->selection_points = job_render->selection_points;
 452                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 453                 job_info->selection = cairo_surface_reference (job_render->selection);
 454                 g_assert (job_info->selection_points.x1 >= 0);
 455                 job_info->points_set = TRUE;
 456         }
 457
 458         if (job_info->job) {
 459                 g_signal_handlers_disconnect_by_func (job_info->job,
 460                                                       G_CALLBACK (job_finished_cb),
 461                                                       pixbuf_cache);
 462                 ev_job_queue_remove_job (job_info->job);
 463                 g_object_unref (G_OBJECT (job_info->job));
 464                 job_info->job = NULL;
 465         }
 466 }
 467
 468 static CacheJobInfo *
 469 find_job_cache (EvPixbufCache *pixbuf_cache,
 470                 int            page)
 471 {
 472         int page_offset;
 473
 474         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 475             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 476                 return NULL;
 477
 478         if (page < pixbuf_cache->start_page) {
 479                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 480
 481                 g_assert (page_offset >= 0 &&
 482                           page_offset < pixbuf_cache->preload_cache_size);
 483                 return pixbuf_cache->prev_job + page_offset;
 484         }
 485
 486         if (page > pixbuf_cache->end_page) {
 487                 page_offset = (page - (pixbuf_cache->end_page + 1));
 488
 489                 g_assert (page_offset >= 0 &&
 490                           page_offset < pixbuf_cache->preload_cache_size);
 491                 return pixbuf_cache->next_job + page_offset;
 492         }
 493
 494         page_offset = page - pixbuf_cache->start_page;
 495         g_assert (page_offset >= 0 &&
 496                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 497         return pixbuf_cache->job_list + page_offset;
 498 }
 499
 500 static void
 501 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 502                                  gfloat         scale)
 503 {
 504         EvPageCache *page_cache;
 505         int i;
 506
 507         page_cache = ev_page_cache_get (pixbuf_cache->document);
 508
 509         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 510                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->job_list + i, page_cache, scale);
 511         }
 512
 513         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 514                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->prev_job + i, page_cache, scale);
 515                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->next_job + i, page_cache, scale);
 516         }
 517 }
 518
 519 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 520         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 521
 522 static void
 523 get_selection_colors (GtkWidget *widget, GdkColor **text, GdkColor **base)
 524 {
 525     if (GTK_WIDGET_HAS_FOCUS (widget)) {
 526         *text = &widget->style->text [GTK_STATE_SELECTED];
 527         *base = &widget->style->base [GTK_STATE_SELECTED];
 528     } else {
 529         *text = &widget->style->text [GTK_STATE_ACTIVE];
 530         *base = &widget->style->base [GTK_STATE_ACTIVE];
 531     }
 532 }
 533
 534 static void
 535 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 536                    CacheJobInfo  *job_info,
 537                    EvPageCache   *page_cache,
 538                    gint           page,
 539                    gint           rotation,
 540                    gfloat         scale,
 541                    EvJobPriority  priority)
 542 {
 543         gboolean include_links = FALSE;
 544         gboolean include_text = FALSE;
 545         gboolean include_selection = FALSE;
 546         gboolean include_images = FALSE;
 547         int width, height;
 548         GdkColor *text, *base;
 549
 550         if (job_info->job)
 551                 return;
 552
 553         ev_page_cache_get_size (page_cache, page, rotation,
 554                                 scale, &width, &height);
 555
 556         if (job_info->surface &&
 557             cairo_image_surface_get_width (job_info->surface) == width &&
 558             cairo_image_surface_get_height (job_info->surface) == height)
 559                 return;
 560
 561         /* make a new job now */
 562         if (job_info->rc == NULL) {
 563                 job_info->rc = ev_render_context_new (rotation, page, scale);
 564         } else {
 565                 ev_render_context_set_rotation (job_info->rc, rotation);
 566                 ev_render_context_set_page (job_info->rc, page);
 567                 ev_render_context_set_scale (job_info->rc, scale);
 568         }
 569
 570         /* Figure out what else we need for this job */
 571         if (job_info->link_mapping == NULL)
 572                 include_links = TRUE;
 573         if (job_info->image_mapping == NULL)
 574                 include_images = TRUE;
 575         if (job_info->text_mapping == NULL)
 576                 include_text = TRUE;
 577         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 578                 include_selection = TRUE;
 579         }
 580
 581         gtk_widget_ensure_style (pixbuf_cache->view);
 582
 583         get_selection_colors (pixbuf_cache->view, &text, &base);
 584
 585         job_info->job = ev_job_render_new (pixbuf_cache->document,
 586                                            job_info->rc,
 587                                            width, height,
 588                                            &(job_info->target_points),
 589                                            text, base,
 590                                            include_links,
 591                                            include_images,
 592                                            include_text,
 593                                            include_selection);
 594         ev_job_queue_add_job (job_info->job, priority);
 595         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 596 }
 597
 598
 599 static void
 600 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 601                                     gint           rotation,
 602                                     gfloat         scale)
 603 {
 604         EvPageCache *page_cache;
 605         CacheJobInfo *job_info;
 606         int page;
 607         int i;
 608
 609         page_cache = ev_page_cache_get (pixbuf_cache->document);
 610
 611         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 612                 job_info = (pixbuf_cache->job_list + i);
 613                 page = pixbuf_cache->start_page + i;
 614
 615                 add_job_if_needed (pixbuf_cache, job_info,
 616                                    page_cache, page, rotation, scale,
 617                                    EV_JOB_PRIORITY_HIGH);
 618         }
 619
 620         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 621                 job_info = (pixbuf_cache->prev_job + i);
 622                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 623
 624                 add_job_if_needed (pixbuf_cache, job_info,
 625                                    page_cache, page, rotation, scale,
 626                                    EV_JOB_PRIORITY_LOW);
 627         }
 628
 629         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 630                 job_info = (pixbuf_cache->next_job + i);
 631                 page = pixbuf_cache->end_page + 1 + i;
 632
 633                 add_job_if_needed (pixbuf_cache, job_info,
 634                                    page_cache, page, rotation, scale,
 635                                    EV_JOB_PRIORITY_LOW);
 636         }
 637
 638 }
 639
 640 void
 641 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 642                                 gint            start_page,
 643                                 gint            end_page,
 644                                 gint            rotation,
 645                                 gfloat          scale,
 646                                 GList          *selection_list)
 647 {
 648         EvPageCache *page_cache;
 649
 650         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 651
 652         page_cache = ev_page_cache_get (pixbuf_cache->document);
 653
 654         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 655         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 656         g_return_if_fail (end_page >= start_page);
 657
 658         /* First, resize the page_range as needed.  We cull old pages
 659          * mercilessly. */
 660         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 661
 662         /* Then, we update the current jobs to see if any of them are the wrong
 663          * size, we remove them if we need to. */
 664         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 665
 666         /* Next, we update the target selection for our pages */
 667         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 668
 669         /* Finally, we add the new jobs for all the sizes that don't have a
 670          * pixbuf */
 671         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 672 }
 673
 674 cairo_surface_t *
 675 ev_pixbuf_cache_get_surface (EvPixbufCache *pixbuf_cache,
 676                              gint           page)
 677 {
 678         CacheJobInfo *job_info;
 679
 680         job_info = find_job_cache (pixbuf_cache, page);
 681         if (job_info == NULL)
 682                 return NULL;
 683
 684         /* We don't need to wait for the idle to handle the callback */
 685         if (job_info->job &&
 686             EV_JOB (job_info->job)->finished) {
 687                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 688                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 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                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 709         }
 710
 711         return job_info->link_mapping;
 712 }
 713
 714 GList *
 715 ev_pixbuf_cache_get_image_mapping (EvPixbufCache *pixbuf_cache,
 716                                    gint           page)
 717 {
 718         CacheJobInfo *job_info;
 719
 720         if (!EV_IS_DOCUMENT_IMAGES (pixbuf_cache->document))
 721                 return NULL;
 722
 723         job_info = find_job_cache (pixbuf_cache, page);
 724         if (job_info == NULL)
 725                 return NULL;
 726
 727         /* We don't need to wait for the idle to handle the callback */
 728         if (job_info->job &&
 729             EV_JOB (job_info->job)->finished) {
 730                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 731                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 732         }
 733
 734         return job_info->image_mapping;
 735 }
 736
 737 static gboolean
 738 new_selection_surface_needed (EvPixbufCache *pixbuf_cache,
 739                              CacheJobInfo  *job_info,
 740                              gint           page,
 741                              gfloat         scale)
 742 {
 743         EvPageCache *page_cache;
 744
 745         if (job_info->selection) {
 746                 gint width, height;
 747                 gint selection_width, selection_height;
 748
 749                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 750                 ev_page_cache_get_size (page_cache, page,
 751                                         job_info->rc->rotation,
 752                                         scale, &width, &height);
 753
 754                 selection_width = cairo_image_surface_get_width (job_info->selection);
 755                 selection_height = cairo_image_surface_get_height (job_info->selection);
 756
 757                 if (width != selection_width || height != selection_height)
 758                         return TRUE;
 759         } else {
 760                 if (job_info->points_set)
 761                         return TRUE;
 762         }
 763
 764         return FALSE;
 765 }
 766
 767 static void
 768 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 769                            CacheJobInfo  *job_info,
 770                            gint           page,
 771                            gfloat         scale)
 772 {
 773         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 774                 if (job_info->selection)
 775                         cairo_surface_destroy (job_info->selection);
 776                 job_info->selection = NULL;
 777                 job_info->selection_points.x1 = -1;
 778         }
 779 }
 780
 781 GdkRegion *
 782 ev_pixbuf_cache_get_text_mapping (EvPixbufCache *pixbuf_cache,
 783                                   gint           page)
 784 {
 785         CacheJobInfo *job_info;
 786
 787         job_info = find_job_cache (pixbuf_cache, page);
 788         if (job_info == NULL)
 789                 return NULL;
 790
 791         /* We don't need to wait for the idle to handle the callback */
 792         if (job_info->job &&
 793             EV_JOB (job_info->job)->finished) {
 794                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 795                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 796         }
 797
 798         return job_info->text_mapping;
 799 }
 800
 801 /* Clears the cache of jobs and pixbufs.
 802  */
 803 void
 804 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 805 {
 806         int i;
 807
 808         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 809                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 810                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 811         }
 812
 813         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 814                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 815         }
 816 }
 817
 818
 819 void
 820 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 821 {
 822         gint i;
 823
 824         /* FIXME: doesn't update running jobs. */
 825         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 826                 CacheJobInfo *job_info;
 827
 828                 job_info = pixbuf_cache->prev_job + i;
 829                 if (job_info->selection) {
 830                         cairo_surface_destroy (job_info->selection);
 831                         job_info->selection = NULL;
 832                 }
 833
 834                 job_info = pixbuf_cache->next_job + i;
 835                 if (job_info->selection) {
 836                         cairo_surface_destroy (job_info->selection);
 837                         job_info->selection = NULL;
 838                 }
 839         }
 840
 841         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 842                 CacheJobInfo *job_info;
 843
 844                 job_info = pixbuf_cache->job_list + i;
 845                 if (job_info->selection) {
 846                         cairo_surface_destroy (job_info->selection);
 847                         job_info->selection = NULL;
 848                 }
 849         }
 850 }
 851
 852 cairo_surface_t *
 853 ev_pixbuf_cache_get_selection_surface (EvPixbufCache  *pixbuf_cache,
 854                                        gint            page,
 855                                        gfloat          scale,
 856                                        GdkRegion     **region)
 857 {
 858         CacheJobInfo *job_info;
 859
 860         /* the document does not implement the selection interface */
 861         if (!EV_IS_SELECTION (pixbuf_cache->document))
 862                 return NULL;
 863
 864         job_info = find_job_cache (pixbuf_cache, page);
 865         if (job_info == NULL)
 866                 return NULL;
 867
 868         /* No selection on this page */
 869         if (!job_info->points_set)
 870                 return NULL;
 871
 872         /* Update the rc */
 873         g_assert (job_info->rc);
 874         ev_render_context_set_scale (job_info->rc, scale);
 875
 876         /* If we have a running job, we just return what we have under the
 877          * assumption that it'll be updated later and we can scale it as need
 878          * be */
 879         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 880                 return job_info->selection;
 881
 882         /* Now, lets see if we need to resize the image.  If we do, we clear the
 883          * old one. */
 884         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 885
 886         /* Finally, we see if the two scales are the same, and get a new pixbuf
 887          * if needed.  We do this synchronously for now.  At some point, we
 888          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 889          * doesn't kill us.  Rendering a few glyphs should really be fast.
 890          */
 891         if (ev_rect_cmp (&(job_info->target_points), &(job_info->selection_points))) {
 892                 EvRectangle *old_points;
 893                 GdkColor *text, *base;
 894
 895                 /* we need to get a new selection pixbuf */
 896                 ev_document_doc_mutex_lock ();
 897                 if (job_info->selection_points.x1 < 0) {
 898                         g_assert (job_info->selection == NULL);
 899                         old_points = NULL;
 900                 } else {
 901                         g_assert (job_info->selection != NULL);
 902                         old_points = &(job_info->selection_points);
 903                 }
 904
 905                 if (job_info->selection_region)
 906                         gdk_region_destroy (job_info->selection_region);
 907                 job_info->selection_region =
 908                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 909                                                            job_info->rc,
 910                                                            &(job_info->target_points));
 911
 912                 gtk_widget_ensure_style (pixbuf_cache->view);
 913
 914                 get_selection_colors (pixbuf_cache->view, &text, &base);
 915
 916                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 917                                                job_info->rc, &(job_info->selection),
 918                                                &(job_info->target_points),
 919                                                old_points,
 920                                                text, base);
 921                 job_info->selection_points = job_info->target_points;
 922                 ev_document_doc_mutex_unlock ();
 923         }
 924         if (region)
 925                 *region = job_info->selection_region;
 926         return job_info->selection;
 927 }
 928
 929 static void
 930 update_job_selection (CacheJobInfo    *job_info,
 931                       EvViewSelection *selection)
 932 {
 933         job_info->points_set = TRUE;
 934         job_info->target_points = selection->rect;
 935 }
 936
 937 static void
 938 clear_job_selection (CacheJobInfo *job_info)
 939 {
 940         job_info->points_set = FALSE;
 941         job_info->selection_points.x1 = -1;
 942
 943         if (job_info->selection) {
 944                 cairo_surface_destroy (job_info->selection);
 945                 job_info->selection = NULL;
 946         }
 947 }
 948
 949 /* This function will reset the selection on pages that no longer have them, and
 950  * will update the target_selection on those that need it.  It will _not_ free
 951  * the previous selection_list -- that's up to caller to do.
 952  */
 953 void
 954 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 955                                     GList         *selection_list)
 956 {
 957         EvPageCache *page_cache;
 958         EvViewSelection *selection;
 959         GList *list = selection_list;
 960         int page;
 961         int i;
 962
 963         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 964
 965         if (!EV_IS_SELECTION (pixbuf_cache->document))
 966                 return;
 967
 968         page_cache = ev_page_cache_get (pixbuf_cache->document);
 969
 970         /* We check each area to see what needs updating, and what needs freeing; */
 971         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 972         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 973                 if (page < 0) {
 974                         page ++;
 975                         continue;
 976                 }
 977
 978                 selection = NULL;
 979                 while (list) {
 980                         if (((EvViewSelection *)list->data)->page == page) {
 981                                 selection = list->data;
 982                                 break;
 983                         } else if (((EvViewSelection *)list->data)->page > page)
 984                                 break;
 985                         list = list->next;
 986                 }
 987
 988                 if (selection)
 989                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 990                 else
 991                         clear_job_selection (pixbuf_cache->prev_job + i);
 992                 page ++;
 993         }
 994
 995         page = pixbuf_cache->start_page;
 996         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 997                 selection = NULL;
 998                 while (list) {
 999                         if (((EvViewSelection *)list->data)->page == page) {
1000                                 selection = list->data;
1001                                 break;
1002                         } else if (((EvViewSelection *)list->data)->page > page)
1003                                 break;
1004                         list = list->next;
1005                 }
1006
1007                 if (selection)
1008                         update_job_selection (pixbuf_cache->job_list + i, selection);
1009                 else
1010                         clear_job_selection (pixbuf_cache->job_list + i);
1011                 page ++;
1012         }
1013
1014         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1015                 if (page >= ev_page_cache_get_n_pages (page_cache))
1016                         break;
1017
1018                 selection = NULL;
1019                 while (list) {
1020                         if (((EvViewSelection *)list->data)->page == page) {
1021                                 selection = list->data;
1022                                 break;
1023                         } else if (((EvViewSelection *)list->data)->page > page)
1024                                 break;
1025                         list = list->next;
1026                 }
1027
1028                 if (selection)
1029                         update_job_selection (pixbuf_cache->next_job + i, selection);
1030                 else
1031                         clear_job_selection (pixbuf_cache->next_job + i);
1032                 page ++;
1033         }
1034 }
1035
1036
1037 /* Returns what the pixbuf cache thinks is */
1038
1039 GList *
1040 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
1041 {
1042         EvPageCache *page_cache;
1043         EvViewSelection *selection;
1044         GList *retval = NULL;
1045         int page;
1046         int i;
1047
1048         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
1049
1050         page_cache = ev_page_cache_get (pixbuf_cache->document);
1051
1052         /* We check each area to see what needs updating, and what needs freeing; */
1053         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1054         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1055                 if (page < 0) {
1056                         page ++;
1057                         continue;
1058                 }
1059
1060                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
1061                         selection = g_new0 (EvViewSelection, 1);
1062                         selection->page = page;
1063                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
1064                         if (pixbuf_cache->prev_job[i].selection_region)
1065                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1066                         retval = g_list_append (retval, selection);
1067                 }
1068
1069                 page ++;
1070         }
1071
1072         page = pixbuf_cache->start_page;
1073         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1074                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1075                         selection = g_new0 (EvViewSelection, 1);
1076                         selection->page = page;
1077                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1078                         if (pixbuf_cache->job_list[i].selection_region)
1079                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1080                         retval = g_list_append (retval, selection);
1081                 }
1082
1083                 page ++;
1084         }
1085
1086         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1087                 if (page >= ev_page_cache_get_n_pages (page_cache))
1088                         break;
1089
1090                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1091                         selection = g_new0 (EvViewSelection, 1);
1092                         selection->page = page;
1093                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1094                         if (pixbuf_cache->next_job[i].selection_region)
1095                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1096                         retval = g_list_append (retval, selection);
1097                 }
1098
1099                 page ++;
1100         }
1101
1102         return retval;
1103 }
1104