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