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 #include "ev-form-field.h"
   8
   9 typedef struct _CacheJobInfo
  10 {
  11         EvJob *job;
  12         EvRenderContext *rc;
  13
  14         /* Data we get from rendering */
  15         cairo_surface_t *surface;
  16         GList *link_mapping;
  17         GList *image_mapping;
  18         GList *form_field_mapping;
  19         GdkRegion *text_mapping;
  20
  21         /* Selection data.
  22          * Selection_points are the coordinates encapsulated in selection.
  23          * target_points is the target selection size. */
  24         EvRectangle selection_points;
  25         EvRectangle target_points;
  26         gboolean    points_set;
  27
  28         cairo_surface_t *selection;
  29         GdkRegion *selection_region;
  30 } CacheJobInfo;
  31
  32 struct _EvPixbufCache
  33 {
  34         GObject parent;
  35
  36         /* We keep a link to our containing view just for style information. */
  37         GtkWidget *view;
  38         EvDocument *document;
  39         int start_page;
  40         int end_page;
  41
  42         /* preload_cache_size is the number of pages prior to the current
  43          * visible area that we cache.  It's normally 1, but could be 2 in the
  44          * case of twin pages.
  45          */
  46         int preload_cache_size;
  47         CacheJobInfo *prev_job;
  48         CacheJobInfo *job_list;
  49         CacheJobInfo *next_job;
  50 };
  51
  52 struct _EvPixbufCacheClass
  53 {
  54         GObjectClass parent_class;
  55
  56         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  57 };
  58
  59
  60 enum
  61 {
  62         JOB_FINISHED,
  63         N_SIGNALS,
  64 };
  65
  66 static guint signals[N_SIGNALS] = {0, };
  67
  68 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  69 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  70 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  71 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  72 static void          job_finished_cb            (EvJob              *job,
  73                                                  EvPixbufCache      *pixbuf_cache);
  74 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  75                                                  int                 page);
  76 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  77                                                  CacheJobInfo       *job_info,
  78                                                  EvPixbufCache      *pixbuf_cache);
  79 static gboolean      new_selection_surface_needed(EvPixbufCache      *pixbuf_cache,
  80                                                   CacheJobInfo       *job_info,
  81                                                   gint                page,
  82                                                   gfloat              scale);
  83
  84
  85 /* These are used for iterating through the prev and next arrays */
  86 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  87         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  88 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  89         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  90 #define PAGE_CACHE_LEN(pixbuf_cache) \
  91         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  92
  93 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  94
  95 static void
  96 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  97 {
  98         pixbuf_cache->start_page = 0;
  99         pixbuf_cache->end_page = 0;
 100         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
 101
 102         pixbuf_cache->preload_cache_size = 2;
 103         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 104         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 105 }
 106
 107 static void
 108 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
 109 {
 110         GObjectClass *object_class;
 111
 112         object_class = G_OBJECT_CLASS (class);
 113
 114         object_class->finalize = ev_pixbuf_cache_finalize;
 115         object_class->dispose = ev_pixbuf_cache_dispose;
 116
 117         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 118                                             G_OBJECT_CLASS_TYPE (object_class),
 119                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 120                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 121                                             NULL, NULL,
 122                                             g_cclosure_marshal_VOID__VOID,
 123                                             G_TYPE_NONE, 0);
 124 }
 125
 126 static void
 127 ev_pixbuf_cache_finalize (GObject *object)
 128 {
 129         EvPixbufCache *pixbuf_cache;
 130
 131         pixbuf_cache = EV_PIXBUF_CACHE (object);
 132
 133         g_free (pixbuf_cache->prev_job);
 134         g_free (pixbuf_cache->job_list);
 135         g_free (pixbuf_cache->next_job);
 136
 137         G_OBJECT_CLASS (ev_pixbuf_cache_parent_class)->finalize (object);
 138 }
 139
 140 static void
 141 dispose_cache_job_info (CacheJobInfo *job_info,
 142                         gpointer      data)
 143 {
 144         if (job_info == NULL)
 145                 return;
 146         if (job_info->job) {
 147                 g_signal_handlers_disconnect_by_func (job_info->job,
 148                                                       G_CALLBACK (job_finished_cb),
 149                                                       data);
 150                 ev_job_queue_remove_job (job_info->job);
 151                 g_object_unref (G_OBJECT (job_info->job));
 152                 job_info->job = NULL;
 153         }
 154         if (job_info->surface) {
 155                 cairo_surface_destroy (job_info->surface);
 156                 job_info->surface = NULL;
 157         }
 158         if (job_info->link_mapping) {
 159                 ev_link_mapping_free (job_info->link_mapping);
 160                 job_info->link_mapping = NULL;
 161         }
 162         if (job_info->image_mapping) {
 163                 ev_image_mapping_free (job_info->image_mapping);
 164                 job_info->image_mapping = NULL;
 165         }
 166         if (job_info->form_field_mapping) {
 167                 ev_form_field_mapping_free (job_info->form_field_mapping);
 168                 job_info->form_field_mapping = NULL;
 169         }
 170         if (job_info->text_mapping) {
 171                 gdk_region_destroy (job_info->text_mapping);
 172                 job_info->text_mapping = NULL;
 173         }
 174         if (job_info->selection) {
 175                 cairo_surface_destroy (job_info->selection);
 176                 job_info->selection = NULL;
 177         }
 178         if (job_info->selection_region) {
 179                 gdk_region_destroy (job_info->selection_region);
 180                 job_info->selection_region = NULL;
 181         }
 182         if (job_info->rc) {
 183                 g_object_unref (G_OBJECT (job_info->rc));
 184                 job_info->rc = NULL;
 185         }
 186
 187         job_info->points_set = FALSE;
 188 }
 189
 190 static void
 191 ev_pixbuf_cache_dispose (GObject *object)
 192 {
 193         EvPixbufCache *pixbuf_cache;
 194         int i;
 195
 196         pixbuf_cache = EV_PIXBUF_CACHE (object);
 197
 198         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 199                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 200                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 201         }
 202
 203         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 204                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 205         }
 206
 207         G_OBJECT_CLASS (ev_pixbuf_cache_parent_class)->dispose (object);
 208 }
 209
 210
 211 EvPixbufCache *
 212 ev_pixbuf_cache_new (GtkWidget  *view,
 213                      EvDocument *document)
 214 {
 215         EvPixbufCache *pixbuf_cache;
 216
 217         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 218         /* This is a backlink, so we don't ref this */
 219         pixbuf_cache->view = view;
 220         pixbuf_cache->document = document;
 221
 222         return pixbuf_cache;
 223 }
 224
 225 static void
 226 job_finished_cb (EvJob         *job,
 227                  EvPixbufCache *pixbuf_cache)
 228 {
 229         CacheJobInfo *job_info;
 230         EvJobRender *job_render = EV_JOB_RENDER (job);
 231
 232         /* If the job is outside of our interest, we silently discard it */
 233         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 234             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 235                 g_object_unref (job);
 236                 return;
 237         }
 238
 239         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 240
 241         copy_job_to_job_info (job_render, job_info, pixbuf_cache);
 242         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 243 }
 244
 245 /* This checks a job to see if the job would generate the right sized pixbuf
 246  * given a scale.  If it won't, it removes the job and clears it to NULL.
 247  */
 248 static void
 249 check_job_size_and_unref (EvPixbufCache *pixbuf_cache,
 250                           CacheJobInfo *job_info,
 251                           EvPageCache  *page_cache,
 252                           gfloat        scale)
 253 {
 254         gint width;
 255         gint height;
 256
 257         g_assert (job_info);
 258
 259         if (job_info->job == NULL)
 260                 return;
 261
 262         ev_page_cache_get_size (page_cache,
 263                                 EV_JOB_RENDER (job_info->job)->rc->page,
 264                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 265                                 scale,
 266                                 &width, &height);
 267
 268         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 269             height == EV_JOB_RENDER (job_info->job)->target_height)
 270                 return;
 271
 272         g_signal_handlers_disconnect_by_func (job_info->job,
 273                                               G_CALLBACK (job_finished_cb),
 274                                               pixbuf_cache);
 275         ev_job_queue_remove_job (job_info->job);
 276         g_object_unref (job_info->job);
 277         job_info->job = NULL;
 278 }
 279
 280 /* Do all function that copies a job from an older cache to it's position in the
 281  * new cache.  It clears the old job if it doesn't have a place.
 282  */
 283 static void
 284 move_one_job (CacheJobInfo  *job_info,
 285               EvPixbufCache *pixbuf_cache,
 286               int            page,
 287               CacheJobInfo  *new_job_list,
 288               CacheJobInfo  *new_prev_job,
 289               CacheJobInfo  *new_next_job,
 290               int            start_page,
 291               int            end_page,
 292               EvJobPriority  priority)
 293 {
 294         CacheJobInfo *target_page = NULL;
 295         int page_offset;
 296         EvJobPriority new_priority;
 297
 298         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 299             page > (end_page + pixbuf_cache->preload_cache_size)) {
 300                 dispose_cache_job_info (job_info, pixbuf_cache);
 301                 return;
 302         }
 303
 304         /* find the target page to copy it over to. */
 305         if (page < start_page) {
 306                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 307
 308                 g_assert (page_offset >= 0 &&
 309                           page_offset < pixbuf_cache->preload_cache_size);
 310                 target_page = new_prev_job + page_offset;
 311                 new_priority = EV_JOB_PRIORITY_LOW;
 312         } else if (page > end_page) {
 313                 page_offset = (page - (end_page + 1));
 314
 315                 g_assert (page_offset >= 0 &&
 316                           page_offset < pixbuf_cache->preload_cache_size);
 317                 target_page = new_next_job + page_offset;
 318                 new_priority = EV_JOB_PRIORITY_LOW;
 319         } else {
 320                 page_offset = page - start_page;
 321                 g_assert (page_offset >= 0 &&
 322                           page_offset <= ((end_page - start_page) + 1));
 323                 new_priority = EV_JOB_PRIORITY_HIGH;
 324                 target_page = new_job_list + page_offset;
 325         }
 326
 327         *target_page = *job_info;
 328         job_info->job = NULL;
 329         job_info->surface = NULL;
 330         job_info->link_mapping = NULL;
 331         job_info->image_mapping = NULL;
 332         job_info->form_field_mapping = NULL;
 333
 334         if (new_priority != priority && target_page->job) {
 335                 ev_job_queue_update_job (target_page->job, new_priority);
 336         }
 337 }
 338
 339
 340
 341 static void
 342 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 343                               gint           start_page,
 344                               gint           end_page)
 345 {
 346         CacheJobInfo *new_job_list;
 347         CacheJobInfo *new_prev_job;
 348         CacheJobInfo *new_next_job;
 349         EvPageCache *page_cache;
 350         int i, page;
 351
 352         if (pixbuf_cache->start_page == start_page &&
 353             pixbuf_cache->end_page == end_page)
 354                 return;
 355
 356         page_cache = ev_page_cache_get (pixbuf_cache->document);
 357
 358         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 359         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 360         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 361
 362         /* We go through each job in the old cache and either clear it or move
 363          * it to a new location. */
 364
 365         /* Start with the prev cache. */
 366         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 367         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 368                 if (page < 0) {
 369                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 370                 } else {
 371                         move_one_job (pixbuf_cache->prev_job + i,
 372                                       pixbuf_cache, page,
 373                                       new_job_list, new_prev_job, new_next_job,
 374                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 375                 }
 376                 page ++;
 377         }
 378
 379         page = pixbuf_cache->start_page;
 380         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 381                 move_one_job (pixbuf_cache->job_list + i,
 382                               pixbuf_cache, page,
 383                               new_job_list, new_prev_job, new_next_job,
 384                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 385                 page ++;
 386         }
 387
 388         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 389                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 390                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 391                 } else {
 392                         move_one_job (pixbuf_cache->next_job + i,
 393                                       pixbuf_cache, page,
 394                                       new_job_list, new_prev_job, new_next_job,
 395                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 396                 }
 397                 page ++;
 398         }
 399
 400         g_free (pixbuf_cache->job_list);
 401         g_free (pixbuf_cache->prev_job);
 402         g_free (pixbuf_cache->next_job);
 403
 404         pixbuf_cache->job_list = new_job_list;
 405         pixbuf_cache->prev_job = new_prev_job;
 406         pixbuf_cache->next_job = new_next_job;
 407
 408         pixbuf_cache->start_page = start_page;
 409         pixbuf_cache->end_page = end_page;
 410 }
 411
 412 static void
 413 copy_job_to_job_info (EvJobRender   *job_render,
 414                       CacheJobInfo  *job_info,
 415                       EvPixbufCache *pixbuf_cache)
 416 {
 417
 418         job_info->points_set = FALSE;
 419
 420         if (job_info->surface) {
 421                 cairo_surface_destroy (job_info->surface);
 422         }
 423         job_info->surface = cairo_surface_reference (job_render->surface);
 424
 425         if (job_info->rc) {
 426                 g_object_unref (G_OBJECT (job_info->rc));
 427         }
 428         job_info->rc = g_object_ref (job_render->rc);
 429
 430         if (job_render->include_links) {
 431                 if (job_info->link_mapping)
 432                         ev_link_mapping_free (job_info->link_mapping);
 433                 job_info->link_mapping = job_render->link_mapping;
 434         }
 435
 436         if (job_render->include_images) {
 437                 if (job_info->image_mapping)
 438                         ev_image_mapping_free (job_info->image_mapping);
 439                 job_info->image_mapping = job_render->image_mapping;
 440         }
 441
 442         if (job_render->include_forms) {
 443                 if (job_info->form_field_mapping)
 444                         ev_form_field_mapping_free (job_info->form_field_mapping);
 445                 job_info->form_field_mapping = job_render->form_field_mapping;
 446         }
 447
 448         if (job_render->include_text) {
 449                 if (job_info->text_mapping)
 450                         gdk_region_destroy (job_info->text_mapping);
 451                 job_info->text_mapping = job_render->text_mapping;
 452         }
 453
 454         if (job_render->include_selection) {
 455                 if (job_info->selection) {
 456                         cairo_surface_destroy (job_info->selection);
 457                         job_info->selection = NULL;
 458                 }
 459                 if (job_info->selection_region) {
 460                         gdk_region_destroy (job_info->selection_region);
 461                         job_info->selection_region = NULL;
 462                 }
 463
 464                 job_info->selection_points = job_render->selection_points;
 465                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 466                 job_info->selection = cairo_surface_reference (job_render->selection);
 467                 g_assert (job_info->selection_points.x1 >= 0);
 468                 job_info->points_set = TRUE;
 469         }
 470
 471         if (job_info->job) {
 472                 g_signal_handlers_disconnect_by_func (job_info->job,
 473                                                       G_CALLBACK (job_finished_cb),
 474                                                       pixbuf_cache);
 475                 ev_job_queue_remove_job (job_info->job);
 476                 g_object_unref (G_OBJECT (job_info->job));
 477                 job_info->job = NULL;
 478         }
 479 }
 480
 481 static CacheJobInfo *
 482 find_job_cache (EvPixbufCache *pixbuf_cache,
 483                 int            page)
 484 {
 485         int page_offset;
 486
 487         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 488             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 489                 return NULL;
 490
 491         if (page < pixbuf_cache->start_page) {
 492                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 493
 494                 g_assert (page_offset >= 0 &&
 495                           page_offset < pixbuf_cache->preload_cache_size);
 496                 return pixbuf_cache->prev_job + page_offset;
 497         }
 498
 499         if (page > pixbuf_cache->end_page) {
 500                 page_offset = (page - (pixbuf_cache->end_page + 1));
 501
 502                 g_assert (page_offset >= 0 &&
 503                           page_offset < pixbuf_cache->preload_cache_size);
 504                 return pixbuf_cache->next_job + page_offset;
 505         }
 506
 507         page_offset = page - pixbuf_cache->start_page;
 508         g_assert (page_offset >= 0 &&
 509                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 510         return pixbuf_cache->job_list + page_offset;
 511 }
 512
 513 static void
 514 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 515                                  gfloat         scale)
 516 {
 517         EvPageCache *page_cache;
 518         int i;
 519
 520         page_cache = ev_page_cache_get (pixbuf_cache->document);
 521
 522         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 523                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->job_list + i, page_cache, scale);
 524         }
 525
 526         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 527                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->prev_job + i, page_cache, scale);
 528                 check_job_size_and_unref (pixbuf_cache, pixbuf_cache->next_job + i, page_cache, scale);
 529         }
 530 }
 531
 532 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 533         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 534
 535 static void
 536 get_selection_colors (GtkWidget *widget, GdkColor **text, GdkColor **base)
 537 {
 538     if (GTK_WIDGET_HAS_FOCUS (widget)) {
 539         *text = &widget->style->text [GTK_STATE_SELECTED];
 540         *base = &widget->style->base [GTK_STATE_SELECTED];
 541     } else {
 542         *text = &widget->style->text [GTK_STATE_ACTIVE];
 543         *base = &widget->style->base [GTK_STATE_ACTIVE];
 544     }
 545 }
 546
 547 static void
 548 add_job (EvPixbufCache *pixbuf_cache,
 549          CacheJobInfo  *job_info,
 550          EvPageCache   *page_cache,
 551          gint           width,
 552          gint           height,
 553          gint           page,
 554          gint           rotation,
 555          gfloat         scale,
 556          EvJobPriority  priority)
 557 {
 558         gboolean include_links = FALSE;
 559         gboolean include_text = FALSE;
 560         gboolean include_selection = FALSE;
 561         gboolean include_images = TRUE;
 562         gboolean include_forms = FALSE;
 563         GdkColor *text, *base;
 564
 565         if (job_info->rc == NULL) {
 566                 job_info->rc = ev_render_context_new (rotation, page, scale);
 567         } else {
 568                 ev_render_context_set_rotation (job_info->rc, rotation);
 569                 ev_render_context_set_page (job_info->rc, page);
 570                 ev_render_context_set_scale (job_info->rc, scale);
 571         }
 572
 573         /* Figure out what else we need for this job */
 574         if (job_info->link_mapping == NULL)
 575                 include_links = TRUE;
 576         if (job_info->image_mapping == NULL)
 577                 include_images = TRUE;
 578         if (job_info->form_field_mapping == NULL)
 579                 include_forms = TRUE;
 580         if (job_info->text_mapping == NULL)
 581                 include_text = TRUE;
 582         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 583                 include_selection = TRUE;
 584         }
 585
 586         gtk_widget_ensure_style (pixbuf_cache->view);
 587
 588         get_selection_colors (pixbuf_cache->view, &text, &base);
 589
 590         job_info->job = ev_job_render_new (pixbuf_cache->document,
 591                                            job_info->rc,
 592                                            width, height,
 593                                            &(job_info->target_points),
 594                                            text, base,
 595                                            include_forms,
 596                                            include_links,
 597                                            include_images,
 598                                            include_text,
 599                                            include_selection);
 600         ev_job_queue_add_job (job_info->job, priority);
 601         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 602 }
 603
 604 static void
 605 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 606                    CacheJobInfo  *job_info,
 607                    EvPageCache   *page_cache,
 608                    gint           page,
 609                    gint           rotation,
 610                    gfloat         scale,
 611                    EvJobPriority  priority)
 612 {
 613         gint width, height;
 614
 615         if (job_info->job)
 616                 return;
 617
 618         ev_page_cache_get_size (page_cache, page, rotation,
 619                                 scale, &width, &height);
 620
 621         if (job_info->surface &&
 622             cairo_image_surface_get_width (job_info->surface) == width &&
 623             cairo_image_surface_get_height (job_info->surface) == height)
 624                 return;
 625
 626         add_job (pixbuf_cache, job_info, page_cache,
 627                  width, height, page, rotation, scale,
 628                  priority);
 629 }
 630
 631 static void
 632 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 633                                     gint           rotation,
 634                                     gfloat         scale)
 635 {
 636         EvPageCache *page_cache;
 637         CacheJobInfo *job_info;
 638         int page;
 639         int i;
 640
 641         page_cache = ev_page_cache_get (pixbuf_cache->document);
 642
 643         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 644                 job_info = (pixbuf_cache->job_list + i);
 645                 page = pixbuf_cache->start_page + i;
 646
 647                 add_job_if_needed (pixbuf_cache, job_info,
 648                                    page_cache, page, rotation, scale,
 649                                    EV_JOB_PRIORITY_HIGH);
 650         }
 651
 652         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 653                 job_info = (pixbuf_cache->prev_job + i);
 654                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 655
 656                 add_job_if_needed (pixbuf_cache, job_info,
 657                                    page_cache, page, rotation, scale,
 658                                    EV_JOB_PRIORITY_LOW);
 659         }
 660
 661         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 662                 job_info = (pixbuf_cache->next_job + i);
 663                 page = pixbuf_cache->end_page + 1 + i;
 664
 665                 add_job_if_needed (pixbuf_cache, job_info,
 666                                    page_cache, page, rotation, scale,
 667                                    EV_JOB_PRIORITY_LOW);
 668         }
 669
 670 }
 671
 672 void
 673 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 674                                 gint            start_page,
 675                                 gint            end_page,
 676                                 gint            rotation,
 677                                 gfloat          scale,
 678                                 GList          *selection_list)
 679 {
 680         EvPageCache *page_cache;
 681
 682         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 683
 684         page_cache = ev_page_cache_get (pixbuf_cache->document);
 685
 686         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 687         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 688         g_return_if_fail (end_page >= start_page);
 689
 690         /* First, resize the page_range as needed.  We cull old pages
 691          * mercilessly. */
 692         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 693
 694         /* Then, we update the current jobs to see if any of them are the wrong
 695          * size, we remove them if we need to. */
 696         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 697
 698         /* Next, we update the target selection for our pages */
 699         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 700
 701         /* Finally, we add the new jobs for all the sizes that don't have a
 702          * pixbuf */
 703         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 704 }
 705
 706 cairo_surface_t *
 707 ev_pixbuf_cache_get_surface (EvPixbufCache *pixbuf_cache,
 708                              gint           page)
 709 {
 710         CacheJobInfo *job_info;
 711
 712         job_info = find_job_cache (pixbuf_cache, page);
 713         if (job_info == NULL)
 714                 return NULL;
 715
 716         /* We don't need to wait for the idle to handle the callback */
 717         if (job_info->job &&
 718             EV_JOB (job_info->job)->finished) {
 719                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 720                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 721         }
 722
 723         return job_info->surface;
 724 }
 725
 726 GList *
 727 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 728                                   gint           page)
 729 {
 730         CacheJobInfo *job_info;
 731
 732         job_info = find_job_cache (pixbuf_cache, page);
 733         if (job_info == NULL)
 734                 return NULL;
 735
 736         /* We don't need to wait for the idle to handle the callback */
 737         if (job_info->job &&
 738             EV_JOB (job_info->job)->finished) {
 739                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 740                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 741         }
 742
 743         return job_info->link_mapping;
 744 }
 745
 746 GList *
 747 ev_pixbuf_cache_get_image_mapping (EvPixbufCache *pixbuf_cache,
 748                                    gint           page)
 749 {
 750         CacheJobInfo *job_info;
 751
 752         if (!EV_IS_DOCUMENT_IMAGES (pixbuf_cache->document))
 753                 return NULL;
 754
 755         job_info = find_job_cache (pixbuf_cache, page);
 756         if (job_info == NULL)
 757                 return NULL;
 758
 759         /* We don't need to wait for the idle to handle the callback */
 760         if (job_info->job &&
 761             EV_JOB (job_info->job)->finished) {
 762                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 763                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 764         }
 765
 766         return job_info->image_mapping;
 767 }
 768
 769 static gboolean
 770 new_selection_surface_needed (EvPixbufCache *pixbuf_cache,
 771                              CacheJobInfo  *job_info,
 772                              gint           page,
 773                              gfloat         scale)
 774 {
 775         EvPageCache *page_cache;
 776
 777         if (job_info->selection) {
 778                 gint width, height;
 779                 gint selection_width, selection_height;
 780
 781                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 782                 ev_page_cache_get_size (page_cache, page,
 783                                         job_info->rc->rotation,
 784                                         scale, &width, &height);
 785
 786                 selection_width = cairo_image_surface_get_width (job_info->selection);
 787                 selection_height = cairo_image_surface_get_height (job_info->selection);
 788
 789                 if (width != selection_width || height != selection_height)
 790                         return TRUE;
 791         } else {
 792                 if (job_info->points_set)
 793                         return TRUE;
 794         }
 795
 796         return FALSE;
 797 }
 798
 799 static void
 800 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 801                            CacheJobInfo  *job_info,
 802                            gint           page,
 803                            gfloat         scale)
 804 {
 805         if (new_selection_surface_needed (pixbuf_cache, job_info, page, scale)) {
 806                 if (job_info->selection)
 807                         cairo_surface_destroy (job_info->selection);
 808                 job_info->selection = NULL;
 809                 job_info->selection_points.x1 = -1;
 810         }
 811 }
 812
 813 GdkRegion *
 814 ev_pixbuf_cache_get_text_mapping (EvPixbufCache *pixbuf_cache,
 815                                   gint           page)
 816 {
 817         CacheJobInfo *job_info;
 818
 819         job_info = find_job_cache (pixbuf_cache, page);
 820         if (job_info == NULL)
 821                 return NULL;
 822
 823         /* We don't need to wait for the idle to handle the callback */
 824         if (job_info->job &&
 825             EV_JOB (job_info->job)->finished) {
 826                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 827                 g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 828         }
 829
 830         return job_info->text_mapping;
 831 }
 832
 833 /* Clears the cache of jobs and pixbufs.
 834  */
 835 void
 836 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 837 {
 838         int i;
 839
 840         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 841                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 842                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 843         }
 844
 845         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 846                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 847         }
 848 }
 849
 850
 851 void
 852 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 853 {
 854         gint i;
 855
 856         /* FIXME: doesn't update running jobs. */
 857         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 858                 CacheJobInfo *job_info;
 859
 860                 job_info = pixbuf_cache->prev_job + i;
 861                 if (job_info->selection) {
 862                         cairo_surface_destroy (job_info->selection);
 863                         job_info->selection = NULL;
 864                 }
 865
 866                 job_info = pixbuf_cache->next_job + i;
 867                 if (job_info->selection) {
 868                         cairo_surface_destroy (job_info->selection);
 869                         job_info->selection = NULL;
 870                 }
 871         }
 872
 873         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 874                 CacheJobInfo *job_info;
 875
 876                 job_info = pixbuf_cache->job_list + i;
 877                 if (job_info->selection) {
 878                         cairo_surface_destroy (job_info->selection);
 879                         job_info->selection = NULL;
 880                 }
 881         }
 882 }
 883
 884 cairo_surface_t *
 885 ev_pixbuf_cache_get_selection_surface (EvPixbufCache  *pixbuf_cache,
 886                                        gint            page,
 887                                        gfloat          scale,
 888                                        GdkRegion     **region)
 889 {
 890         CacheJobInfo *job_info;
 891
 892         /* the document does not implement the selection interface */
 893         if (!EV_IS_SELECTION (pixbuf_cache->document))
 894                 return NULL;
 895
 896         job_info = find_job_cache (pixbuf_cache, page);
 897         if (job_info == NULL)
 898                 return NULL;
 899
 900         /* No selection on this page */
 901         if (!job_info->points_set)
 902                 return NULL;
 903
 904         /* Update the rc */
 905         g_assert (job_info->rc);
 906         ev_render_context_set_scale (job_info->rc, scale);
 907
 908         /* If we have a running job, we just return what we have under the
 909          * assumption that it'll be updated later and we can scale it as need
 910          * be */
 911         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 912                 return job_info->selection;
 913
 914         /* Now, lets see if we need to resize the image.  If we do, we clear the
 915          * old one. */
 916         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 917
 918         /* Finally, we see if the two scales are the same, and get a new pixbuf
 919          * if needed.  We do this synchronously for now.  At some point, we
 920          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 921          * doesn't kill us.  Rendering a few glyphs should really be fast.
 922          */
 923         if (ev_rect_cmp (&(job_info->target_points), &(job_info->selection_points))) {
 924                 EvRectangle *old_points;
 925                 GdkColor *text, *base;
 926
 927                 /* we need to get a new selection pixbuf */
 928                 ev_document_doc_mutex_lock ();
 929                 if (job_info->selection_points.x1 < 0) {
 930                         g_assert (job_info->selection == NULL);
 931                         old_points = NULL;
 932                 } else {
 933                         g_assert (job_info->selection != NULL);
 934                         old_points = &(job_info->selection_points);
 935                 }
 936
 937                 if (job_info->selection_region)
 938                         gdk_region_destroy (job_info->selection_region);
 939                 job_info->selection_region =
 940                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 941                                                            job_info->rc,
 942                                                            &(job_info->target_points));
 943
 944                 gtk_widget_ensure_style (pixbuf_cache->view);
 945
 946                 get_selection_colors (pixbuf_cache->view, &text, &base);
 947
 948                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 949                                                job_info->rc, &(job_info->selection),
 950                                                &(job_info->target_points),
 951                                                old_points,
 952                                                text, base);
 953                 job_info->selection_points = job_info->target_points;
 954                 ev_document_doc_mutex_unlock ();
 955         }
 956         if (region)
 957                 *region = job_info->selection_region;
 958         return job_info->selection;
 959 }
 960
 961 static void
 962 update_job_selection (CacheJobInfo    *job_info,
 963                       EvViewSelection *selection)
 964 {
 965         job_info->points_set = TRUE;
 966         job_info->target_points = selection->rect;
 967 }
 968
 969 static void
 970 clear_job_selection (CacheJobInfo *job_info)
 971 {
 972         job_info->points_set = FALSE;
 973         job_info->selection_points.x1 = -1;
 974
 975         if (job_info->selection) {
 976                 cairo_surface_destroy (job_info->selection);
 977                 job_info->selection = NULL;
 978         }
 979 }
 980
 981 /* This function will reset the selection on pages that no longer have them, and
 982  * will update the target_selection on those that need it.  It will _not_ free
 983  * the previous selection_list -- that's up to caller to do.
 984  */
 985 void
 986 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 987                                     GList         *selection_list)
 988 {
 989         EvPageCache *page_cache;
 990         EvViewSelection *selection;
 991         GList *list = selection_list;
 992         int page;
 993         int i;
 994
 995         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 996
 997         if (!EV_IS_SELECTION (pixbuf_cache->document))
 998                 return;
 999
1000         page_cache = ev_page_cache_get (pixbuf_cache->document);
1001
1002         /* We check each area to see what needs updating, and what needs freeing; */
1003         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1004         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1005                 if (page < 0) {
1006                         page ++;
1007                         continue;
1008                 }
1009
1010                 selection = NULL;
1011                 while (list) {
1012                         if (((EvViewSelection *)list->data)->page == page) {
1013                                 selection = list->data;
1014                                 break;
1015                         } else if (((EvViewSelection *)list->data)->page > page)
1016                                 break;
1017                         list = list->next;
1018                 }
1019
1020                 if (selection)
1021                         update_job_selection (pixbuf_cache->prev_job + i, selection);
1022                 else
1023                         clear_job_selection (pixbuf_cache->prev_job + i);
1024                 page ++;
1025         }
1026
1027         page = pixbuf_cache->start_page;
1028         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1029                 selection = NULL;
1030                 while (list) {
1031                         if (((EvViewSelection *)list->data)->page == page) {
1032                                 selection = list->data;
1033                                 break;
1034                         } else if (((EvViewSelection *)list->data)->page > page)
1035                                 break;
1036                         list = list->next;
1037                 }
1038
1039                 if (selection)
1040                         update_job_selection (pixbuf_cache->job_list + i, selection);
1041                 else
1042                         clear_job_selection (pixbuf_cache->job_list + i);
1043                 page ++;
1044         }
1045
1046         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1047                 if (page >= ev_page_cache_get_n_pages (page_cache))
1048                         break;
1049
1050                 selection = NULL;
1051                 while (list) {
1052                         if (((EvViewSelection *)list->data)->page == page) {
1053                                 selection = list->data;
1054                                 break;
1055                         } else if (((EvViewSelection *)list->data)->page > page)
1056                                 break;
1057                         list = list->next;
1058                 }
1059
1060                 if (selection)
1061                         update_job_selection (pixbuf_cache->next_job + i, selection);
1062                 else
1063                         clear_job_selection (pixbuf_cache->next_job + i);
1064                 page ++;
1065         }
1066 }
1067
1068
1069 /* Returns what the pixbuf cache thinks is */
1070
1071 GList *
1072 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
1073 {
1074         EvPageCache *page_cache;
1075         EvViewSelection *selection;
1076         GList *retval = NULL;
1077         int page;
1078         int i;
1079
1080         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
1081
1082         page_cache = ev_page_cache_get (pixbuf_cache->document);
1083
1084         /* We check each area to see what needs updating, and what needs freeing; */
1085         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
1086         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1087                 if (page < 0) {
1088                         page ++;
1089                         continue;
1090                 }
1091
1092                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
1093                         selection = g_new0 (EvViewSelection, 1);
1094                         selection->page = page;
1095                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
1096                         if (pixbuf_cache->prev_job[i].selection_region)
1097                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1098                         retval = g_list_append (retval, selection);
1099                 }
1100
1101                 page ++;
1102         }
1103
1104         page = pixbuf_cache->start_page;
1105         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1106                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1107                         selection = g_new0 (EvViewSelection, 1);
1108                         selection->page = page;
1109                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1110                         if (pixbuf_cache->job_list[i].selection_region)
1111                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1112                         retval = g_list_append (retval, selection);
1113                 }
1114
1115                 page ++;
1116         }
1117
1118         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1119                 if (page >= ev_page_cache_get_n_pages (page_cache))
1120                         break;
1121
1122                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1123                         selection = g_new0 (EvViewSelection, 1);
1124                         selection->page = page;
1125                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1126                         if (pixbuf_cache->next_job[i].selection_region)
1127                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1128                         retval = g_list_append (retval, selection);
1129                 }
1130
1131                 page ++;
1132         }
1133
1134         return retval;
1135 }
1136
1137 void
1138 ev_pixbuf_cache_reload_page (EvPixbufCache *pixbuf_cache,
1139                              gint           page,
1140                              gint           rotation,
1141                              gfloat         scale)
1142 {
1143         CacheJobInfo *job_info;
1144         EvPageCache *page_cache;
1145         gint width, height;
1146
1147         job_info = find_job_cache (pixbuf_cache, page);
1148         if (job_info == NULL)
1149                 return;
1150
1151         page_cache = ev_page_cache_get (pixbuf_cache->document);
1152         ev_page_cache_get_size (page_cache, page, rotation, scale,
1153                                 &width, &height);
1154
1155         add_job (pixbuf_cache, job_info, page_cache,
1156                  width, height, page, rotation, scale,
1157                  EV_JOB_PRIORITY_HIGH);
1158 }
1159
1160 GList *
1161 ev_pixbuf_cache_get_form_field_mapping (EvPixbufCache *pixbuf_cache,
1162                                         gint           page)
1163 {
1164         CacheJobInfo *job_info;
1165
1166         job_info = find_job_cache (pixbuf_cache, page);
1167         if (job_info == NULL)
1168                 return NULL;
1169
1170         if (job_info->job &&
1171            EV_JOB (job_info->job)->finished) {
1172                 copy_job_to_job_info (EV_JOB_RENDER(job_info->job), job_info, pixbuf_cache);
1173         }
1174         return job_info->form_field_mapping;
1175 }
1176