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         GdkPixbuf *pixbuf;
  10         EvRenderContext *rc;
  11         GList *link_mapping;
  12         GdkRegion *text_mapping;
  13
  14         /* Selection info.  If the *_points structs are unset, we put -1 in x1.
  15          * selection_points are the coordinates encapsulated in selection.
  16          * new_points is the target selection size. */
  17         EvRectangle selection_points;
  18         GdkPixbuf *selection;
  19         GdkRegion *selection_region;
  20         EvRectangle new_points;
  21 } CacheJobInfo;
  22
  23 struct _EvPixbufCache
  24 {
  25         GObject parent;
  26
  27         /* We keep a link to our containing view just for style information. */
  28         GtkWidget *view;
  29         EvDocument *document;
  30         int start_page;
  31         int end_page;
  32
  33         /* preload_cache_size is the number of pages prior to the current
  34          * visible area that we cache.  It's normally 1, but could be 2 in the
  35          * case of twin pages.
  36          */
  37         int preload_cache_size;
  38         CacheJobInfo *prev_job;
  39         CacheJobInfo *job_list;
  40         CacheJobInfo *next_job;
  41 };
  42
  43 struct _EvPixbufCacheClass
  44 {
  45         GObjectClass parent_class;
  46
  47         void (* job_finished) (EvPixbufCache *pixbuf_cache);
  48 };
  49
  50
  51 enum
  52 {
  53         JOB_FINISHED,
  54         N_SIGNALS,
  55 };
  56
  57 static guint signals[N_SIGNALS] = {0, };
  58
  59 static void          ev_pixbuf_cache_init       (EvPixbufCache      *pixbuf_cache);
  60 static void          ev_pixbuf_cache_class_init (EvPixbufCacheClass *pixbuf_cache);
  61 static void          ev_pixbuf_cache_finalize   (GObject            *object);
  62 static void          ev_pixbuf_cache_dispose    (GObject            *object);
  63 static void          job_finished_cb            (EvJob              *job,
  64                                                  EvPixbufCache      *pixbuf_cache);
  65 static CacheJobInfo *find_job_cache             (EvPixbufCache      *pixbuf_cache,
  66                                                  int                 page);
  67 static void          copy_job_to_job_info       (EvJobRender        *job_render,
  68                                                  CacheJobInfo       *job_info,
  69                                                  EvPixbufCache      *pixbuf_cache);
  70 static guint         convert_gdk_color_to_uint  (GdkColor           *color);
  71 static gboolean      new_selection_pixbuf_needed(EvPixbufCache      *pixbuf_cache,
  72                                                  CacheJobInfo       *job_info,
  73                                                  gint                page,
  74                                                  gfloat              scale);
  75
  76
  77 /* These are used for iterating through the prev and next arrays */
  78 #define FIRST_VISABLE_PREV(pixbuf_cache) \
  79         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
  80 #define VISIBLE_NEXT_LEN(pixbuf_cache, page_cache) \
  81         (MIN(pixbuf_cache->preload_cache_size, ev_page_cache_get_n_pages (page_cache) - (1 + pixbuf_cache->end_page)))
  82 #define PAGE_CACHE_LEN(pixbuf_cache) \
  83         ((pixbuf_cache->end_page - pixbuf_cache->start_page) + 1)
  84
  85 G_DEFINE_TYPE (EvPixbufCache, ev_pixbuf_cache, G_TYPE_OBJECT)
  86
  87 static void
  88 ev_pixbuf_cache_init (EvPixbufCache *pixbuf_cache)
  89 {
  90         pixbuf_cache->start_page = 0;
  91         pixbuf_cache->end_page = 0;
  92         pixbuf_cache->job_list = g_new0 (CacheJobInfo, PAGE_CACHE_LEN (pixbuf_cache));
  93
  94         pixbuf_cache->preload_cache_size = 2;
  95         pixbuf_cache->prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  96         pixbuf_cache->next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
  97 }
  98
  99 static void
 100 ev_pixbuf_cache_class_init (EvPixbufCacheClass *class)
 101 {
 102         GObjectClass *object_class;
 103
 104         object_class = G_OBJECT_CLASS (class);
 105
 106         object_class->finalize = ev_pixbuf_cache_finalize;
 107         object_class->dispose = ev_pixbuf_cache_dispose;
 108
 109         signals[JOB_FINISHED] = g_signal_new ("job-finished",
 110                                             G_OBJECT_CLASS_TYPE (object_class),
 111                                             G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 112                                             G_STRUCT_OFFSET (EvPixbufCacheClass, job_finished),
 113                                             NULL, NULL,
 114                                             g_cclosure_marshal_VOID__VOID,
 115                                             G_TYPE_NONE, 0);
 116 }
 117
 118 static void
 119 ev_pixbuf_cache_finalize (GObject *object)
 120 {
 121         EvPixbufCache *pixbuf_cache;
 122
 123         pixbuf_cache = EV_PIXBUF_CACHE (object);
 124
 125         g_free (pixbuf_cache->prev_job);
 126         g_free (pixbuf_cache->job_list);
 127         g_free (pixbuf_cache->next_job);
 128 }
 129
 130 static void
 131 dispose_cache_job_info (CacheJobInfo *job_info,
 132                         gpointer      data)
 133 {
 134         if (job_info == NULL)
 135                 return;
 136         if (job_info->job) {
 137                 g_signal_handlers_disconnect_by_func (job_info->job,
 138                                                       G_CALLBACK (job_finished_cb),
 139                                                       data);
 140                 ev_job_queue_remove_job (job_info->job);
 141                 g_object_unref (G_OBJECT (job_info->job));
 142                 job_info->job = NULL;
 143         }
 144         if (job_info->pixbuf) {
 145                 g_object_unref (G_OBJECT (job_info->pixbuf));
 146                 job_info->pixbuf = NULL;
 147         }
 148         if (job_info->link_mapping) {
 149                 ev_link_mapping_free (job_info->link_mapping);
 150                 job_info->link_mapping = NULL;
 151         }
 152         if (job_info->text_mapping) {
 153                 gdk_region_destroy (job_info->text_mapping);
 154                 job_info->text_mapping = NULL;
 155         }
 156         if (job_info->selection) {
 157                 g_object_unref (G_OBJECT (job_info->selection));
 158                 job_info->selection = NULL;
 159         }
 160         if (job_info->selection_region) {
 161                 gdk_region_destroy (job_info->selection_region);
 162                 job_info->selection_region = NULL;
 163         }
 164
 165         job_info->selection_points.x1 = -1;
 166         job_info->new_points.x1 = -1;
 167 }
 168
 169 static void
 170 ev_pixbuf_cache_dispose (GObject *object)
 171 {
 172         EvPixbufCache *pixbuf_cache;
 173         int i;
 174
 175         pixbuf_cache = EV_PIXBUF_CACHE (object);
 176
 177         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 178                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 179                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 180         }
 181
 182         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 183                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 184         }
 185 }
 186
 187
 188 EvPixbufCache *
 189 ev_pixbuf_cache_new (GtkWidget  *view,
 190                      EvDocument *document)
 191 {
 192         EvPixbufCache *pixbuf_cache;
 193
 194         pixbuf_cache = (EvPixbufCache *) g_object_new (EV_TYPE_PIXBUF_CACHE, NULL);
 195         /* This is a backlink, so we don't ref this */
 196         pixbuf_cache->view = view;
 197         pixbuf_cache->document = document;
 198
 199         return pixbuf_cache;
 200 }
 201
 202 static void
 203 job_finished_cb (EvJob         *job,
 204                  EvPixbufCache *pixbuf_cache)
 205 {
 206         CacheJobInfo *job_info;
 207         EvJobRender *job_render = EV_JOB_RENDER (job);
 208         GdkPixbuf *pixbuf;
 209
 210         /* If the job is outside of our interest, we silently discard it */
 211         if ((job_render->rc->page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size)) ||
 212             (job_render->rc->page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))) {
 213                 g_object_unref (job);
 214                 return;
 215         }
 216
 217         job_info = find_job_cache (pixbuf_cache, job_render->rc->page);
 218
 219         pixbuf = g_object_ref (job_render->pixbuf);
 220         if (job_info->pixbuf)
 221                 g_object_unref (job_info->pixbuf);
 222         job_info->pixbuf = pixbuf;
 223
 224         if (job_render->link_mapping) {
 225                 if (job_info->link_mapping)
 226                         ev_link_mapping_free (job_info->link_mapping);
 227                 job_info->link_mapping = job_render->link_mapping;
 228         }
 229
 230         if (job_render->text_mapping) {
 231                 if (job_info->text_mapping)
 232                         gdk_region_destroy (job_info->text_mapping);
 233                 job_info->text_mapping = job_render->text_mapping;
 234         }
 235
 236         if (job_render->include_selection) {
 237                 pixbuf = g_object_ref (job_render->selection);
 238                 if (job_info->selection)
 239                         g_object_unref (job_info->selection);
 240                 if (job_info->selection_region)
 241                         gdk_region_destroy (job_info->selection_region);
 242                 job_info->selection_points = job_render->selection_points;
 243                 job_info->selection_region = gdk_region_copy (job_render->selection_region);
 244                 job_info->selection = pixbuf;
 245                 g_assert (job_info->selection_points.x1 >= 0);
 246         }
 247
 248         if (job_info->job == job)
 249                 job_info->job = NULL;
 250         g_object_unref (job);
 251
 252         g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0);
 253 }
 254
 255 /* This checks a job to see if the job would generate the right sized pixbuf
 256  * given a scale.  If it won't, it removes the job and clears it to NULL.
 257  */
 258 static void
 259 check_job_size_and_unref (CacheJobInfo *job_info,
 260                           EvPageCache  *page_cache,
 261                           gfloat        scale)
 262 {
 263         gint width;
 264         gint height;
 265
 266         g_assert (job_info);
 267
 268         if (job_info->job == NULL)
 269                 return;
 270
 271         ev_page_cache_get_size (page_cache,
 272                                 EV_JOB_RENDER (job_info->job)->rc->page,
 273                                 EV_JOB_RENDER (job_info->job)->rc->rotation,
 274                                 scale,
 275                                 &width, &height);
 276
 277         if (width == EV_JOB_RENDER (job_info->job)->target_width &&
 278             height == EV_JOB_RENDER (job_info->job)->target_height)
 279                 return;
 280
 281         /* Try to remove the job.  If we can't, then the thread has already
 282          * picked it up and we are going get a signal when it's done.  If we
 283          * can, then the job is fully dead and will never rnu.. */
 284         if (ev_job_queue_remove_job (job_info->job))
 285                 g_object_unref (job_info->job);
 286
 287         job_info->job = NULL;
 288 }
 289
 290 /* Do all function that copies a job from an older cache to it's position in the
 291  * new cache.  It clears the old job if it doesn't have a place.
 292  */
 293 static void
 294 move_one_job (CacheJobInfo  *job_info,
 295               EvPixbufCache *pixbuf_cache,
 296               int            page,
 297               CacheJobInfo  *new_job_list,
 298               CacheJobInfo  *new_prev_job,
 299               CacheJobInfo  *new_next_job,
 300               int            start_page,
 301               int            end_page,
 302               EvJobPriority  priority)
 303 {
 304         CacheJobInfo *target_page = NULL;
 305         int page_offset;
 306         EvJobPriority new_priority;
 307
 308         if (page < (start_page - pixbuf_cache->preload_cache_size) ||
 309             page > (end_page + pixbuf_cache->preload_cache_size)) {
 310                 dispose_cache_job_info (job_info, pixbuf_cache);
 311                 return;
 312         }
 313
 314         /* find the target page to copy it over to. */
 315         if (page < start_page) {
 316                 page_offset = (page - (start_page - pixbuf_cache->preload_cache_size));
 317
 318                 g_assert (page_offset >= 0 &&
 319                           page_offset < pixbuf_cache->preload_cache_size);
 320                 target_page = new_prev_job + page_offset;
 321                 new_priority = EV_JOB_PRIORITY_LOW;
 322         } else if (page > end_page) {
 323                 page_offset = (page - (end_page + 1));
 324
 325                 g_assert (page_offset >= 0 &&
 326                           page_offset < pixbuf_cache->preload_cache_size);
 327                 target_page = new_next_job + page_offset;
 328                 new_priority = EV_JOB_PRIORITY_LOW;
 329         } else {
 330                 page_offset = page - start_page;
 331                 g_assert (page_offset >= 0 &&
 332                           page_offset <= ((end_page - start_page) + 1));
 333                 new_priority = EV_JOB_PRIORITY_HIGH;
 334                 target_page = new_job_list + page_offset;
 335         }
 336
 337         *target_page = *job_info;
 338         job_info->job = NULL;
 339         job_info->pixbuf = NULL;
 340         job_info->link_mapping = NULL;
 341
 342         if (new_priority != priority && target_page->job) {
 343                 ev_job_queue_update_job (target_page->job, new_priority);
 344         }
 345 }
 346
 347
 348
 349 static void
 350 ev_pixbuf_cache_update_range (EvPixbufCache *pixbuf_cache,
 351                               gint           start_page,
 352                               gint           end_page)
 353 {
 354         CacheJobInfo *new_job_list;
 355         CacheJobInfo *new_prev_job;
 356         CacheJobInfo *new_next_job;
 357         EvPageCache *page_cache;
 358         int i, page;
 359
 360         if (pixbuf_cache->start_page == start_page &&
 361             pixbuf_cache->end_page == end_page)
 362                 return;
 363
 364         page_cache = ev_page_cache_get (pixbuf_cache->document);
 365
 366         new_job_list = g_new0 (CacheJobInfo, (end_page - start_page) + 1);
 367         new_prev_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 368         new_next_job = g_new0 (CacheJobInfo, pixbuf_cache->preload_cache_size);
 369
 370         /* We go through each job in the old cache and either clear it or move
 371          * it to a new location. */
 372
 373         /* Start with the prev cache. */
 374         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 375         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 376                 if (page < 0) {
 377                         dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 378                 } else {
 379                         move_one_job (pixbuf_cache->prev_job + i,
 380                                       pixbuf_cache, page,
 381                                       new_job_list, new_prev_job, new_next_job,
 382                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 383                 }
 384                 page ++;
 385         }
 386
 387         page = pixbuf_cache->start_page;
 388         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 389                 move_one_job (pixbuf_cache->job_list + i,
 390                               pixbuf_cache, page,
 391                               new_job_list, new_prev_job, new_next_job,
 392                               start_page, end_page, EV_JOB_PRIORITY_HIGH);
 393                 page ++;
 394         }
 395
 396         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 397                 if (page >= ev_page_cache_get_n_pages (page_cache)) {
 398                         dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 399                 } else {
 400                         move_one_job (pixbuf_cache->next_job + i,
 401                                       pixbuf_cache, page,
 402                                       new_job_list, new_prev_job, new_next_job,
 403                                       start_page, end_page, EV_JOB_PRIORITY_LOW);
 404                 }
 405                 page ++;
 406         }
 407
 408         g_free (pixbuf_cache->job_list);
 409         g_free (pixbuf_cache->prev_job);
 410         g_free (pixbuf_cache->next_job);
 411
 412         pixbuf_cache->job_list = new_job_list;
 413         pixbuf_cache->prev_job = new_prev_job;
 414         pixbuf_cache->next_job = new_next_job;
 415
 416         pixbuf_cache->start_page = start_page;
 417         pixbuf_cache->end_page = end_page;
 418 }
 419
 420 static void
 421 copy_job_to_job_info (EvJobRender   *job_render,
 422                       CacheJobInfo  *job_info,
 423                       EvPixbufCache *pixbuf_cache)
 424 {
 425         GdkPixbuf *pixbuf;
 426
 427         pixbuf = g_object_ref (job_render->pixbuf);
 428
 429         dispose_cache_job_info (job_info, pixbuf_cache);
 430
 431         job_info->pixbuf = pixbuf;
 432         if (job_render->link_mapping)
 433                 job_info->link_mapping = job_render->link_mapping;
 434         if (job_render->text_mapping)
 435                 job_info->text_mapping = job_render->text_mapping;
 436 }
 437
 438 static CacheJobInfo *
 439 find_job_cache (EvPixbufCache *pixbuf_cache,
 440                 int            page)
 441 {
 442         int page_offset;
 443
 444         if (page < (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size) ||
 445             page > (pixbuf_cache->end_page + pixbuf_cache->preload_cache_size))
 446                 return NULL;
 447
 448         if (page < pixbuf_cache->start_page) {
 449                 page_offset = (page - (pixbuf_cache->start_page - pixbuf_cache->preload_cache_size));
 450
 451                 g_assert (page_offset >= 0 &&
 452                           page_offset < pixbuf_cache->preload_cache_size);
 453                 return pixbuf_cache->prev_job + page_offset;
 454         }
 455
 456         if (page > pixbuf_cache->end_page) {
 457                 page_offset = (page - (pixbuf_cache->end_page + 1));
 458
 459                 g_assert (page_offset >= 0 &&
 460                           page_offset < pixbuf_cache->preload_cache_size);
 461                 return pixbuf_cache->next_job + page_offset;
 462         }
 463
 464         page_offset = page - pixbuf_cache->start_page;
 465         g_assert (page_offset >= 0 &&
 466                   page_offset <= PAGE_CACHE_LEN(pixbuf_cache));
 467         return pixbuf_cache->job_list + page_offset;
 468 }
 469
 470 static void
 471 ev_pixbuf_cache_clear_job_sizes (EvPixbufCache *pixbuf_cache,
 472                                  gfloat         scale)
 473 {
 474         EvPageCache *page_cache;
 475         int i;
 476
 477         page_cache = ev_page_cache_get (pixbuf_cache->document);
 478
 479         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 480                 check_job_size_and_unref (pixbuf_cache->job_list + i, page_cache, scale);
 481         }
 482
 483         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 484                 check_job_size_and_unref (pixbuf_cache->prev_job + i, page_cache, scale);
 485                 check_job_size_and_unref (pixbuf_cache->next_job + i, page_cache, scale);
 486         }
 487 }
 488
 489 #define FIRST_VISABLE_PREV(pixbuf_cache) \
 490         (MAX (0, pixbuf_cache->preload_cache_size + 1 - pixbuf_cache->start_page))
 491
 492 static void
 493 add_job_if_needed (EvPixbufCache *pixbuf_cache,
 494                    CacheJobInfo  *job_info,
 495                    EvPageCache   *page_cache,
 496                    gint           page,
 497                    gint           rotation,
 498                    gfloat         scale,
 499                    EvJobPriority  priority)
 500 {
 501         gboolean include_links = FALSE;
 502         gboolean include_text = FALSE;
 503         gboolean include_selection = FALSE;
 504         int width, height;
 505         guint text, base;
 506
 507         if (job_info->job)
 508                 return;
 509
 510         ev_page_cache_get_size (page_cache, page, rotation,
 511                                 scale, &width, &height);
 512
 513         if (job_info->pixbuf &&
 514             gdk_pixbuf_get_width (job_info->pixbuf) == width &&
 515             gdk_pixbuf_get_height (job_info->pixbuf) == height)
 516                 return;
 517
 518         /* make a new job now */
 519         if (job_info->rc == NULL) {
 520                 job_info->rc = ev_render_context_new (rotation, page, scale);
 521         } else {
 522                 ev_render_context_set_rotation (job_info->rc, rotation);
 523                 ev_render_context_set_page (job_info->rc, page);
 524                 ev_render_context_set_scale (job_info->rc, scale);
 525         }
 526
 527         /* Figure out what else we need for this job */
 528         if (job_info->link_mapping == NULL)
 529                 include_links = TRUE;
 530         if (job_info->text_mapping == NULL)
 531                 include_text = TRUE;
 532         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 533                 include_selection = TRUE;
 534         }
 535
 536         gtk_widget_ensure_style (pixbuf_cache->view);
 537
 538         text = convert_gdk_color_to_uint (& (pixbuf_cache->view->style->text [GTK_STATE_SELECTED]));
 539         base = convert_gdk_color_to_uint (& (pixbuf_cache->view->style->base [GTK_STATE_SELECTED]));
 540
 541         job_info->job = ev_job_render_new (pixbuf_cache->document,
 542                                            job_info->rc,
 543                                            width, height,
 544                                            &(job_info->new_points),
 545                                            text, base,
 546                                            include_links,
 547                                            include_text,
 548                                            include_selection);
 549         ev_job_queue_add_job (job_info->job, priority);
 550         g_signal_connect (job_info->job, "finished", G_CALLBACK (job_finished_cb), pixbuf_cache);
 551 }
 552
 553
 554 static void
 555 ev_pixbuf_cache_add_jobs_if_needed (EvPixbufCache *pixbuf_cache,
 556                                     gint           rotation,
 557                                     gfloat         scale)
 558 {
 559         EvPageCache *page_cache;
 560         CacheJobInfo *job_info;
 561         int page;
 562         int i;
 563
 564         page_cache = ev_page_cache_get (pixbuf_cache->document);
 565
 566         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 567                 job_info = (pixbuf_cache->job_list + i);
 568                 page = pixbuf_cache->start_page + i;
 569
 570                 add_job_if_needed (pixbuf_cache, job_info,
 571                                    page_cache, page, rotation, scale,
 572                                    EV_JOB_PRIORITY_HIGH);
 573         }
 574
 575         for (i = FIRST_VISABLE_PREV(pixbuf_cache); i < pixbuf_cache->preload_cache_size; i++) {
 576                 job_info = (pixbuf_cache->prev_job + i);
 577                 page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size + i;
 578
 579                 add_job_if_needed (pixbuf_cache, job_info,
 580                                    page_cache, page, rotation, scale,
 581                                    EV_JOB_PRIORITY_LOW);
 582         }
 583
 584         for (i = 0; i < VISIBLE_NEXT_LEN(pixbuf_cache, page_cache); i++) {
 585                 job_info = (pixbuf_cache->next_job + i);
 586                 page = pixbuf_cache->end_page + 1 + i;
 587
 588                 add_job_if_needed (pixbuf_cache, job_info,
 589                                    page_cache, page, rotation, scale,
 590                                    EV_JOB_PRIORITY_LOW);
 591         }
 592
 593 }
 594
 595 void
 596 ev_pixbuf_cache_set_page_range (EvPixbufCache  *pixbuf_cache,
 597                                 gint            start_page,
 598                                 gint            end_page,
 599                                 gint            rotation,
 600                                 gfloat          scale,
 601                                 GList          *selection_list)
 602 {
 603         EvPageCache *page_cache;
 604
 605         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 606
 607         page_cache = ev_page_cache_get (pixbuf_cache->document);
 608
 609         g_return_if_fail (start_page >= 0 && start_page < ev_page_cache_get_n_pages (page_cache));
 610         g_return_if_fail (end_page >= 0 && end_page < ev_page_cache_get_n_pages (page_cache));
 611         g_return_if_fail (end_page >= start_page);
 612
 613         /* First, resize the page_range as needed.  We cull old pages
 614          * mercilessly. */
 615         ev_pixbuf_cache_update_range (pixbuf_cache, start_page, end_page);
 616
 617         /* Then, we update the current jobs to see if any of them are the wrong
 618          * size, we remove them if we need to. */
 619         ev_pixbuf_cache_clear_job_sizes (pixbuf_cache, scale);
 620
 621         /* Next, we update the target selection for our pages */
 622         ev_pixbuf_cache_set_selection_list (pixbuf_cache, selection_list);
 623
 624         /* Finally, we add the new jobs for all the sizes that don't have a
 625          * pixbuf */
 626         ev_pixbuf_cache_add_jobs_if_needed (pixbuf_cache, rotation, scale);
 627 }
 628
 629 GdkPixbuf *
 630 ev_pixbuf_cache_get_pixbuf (EvPixbufCache *pixbuf_cache,
 631                             gint           page)
 632 {
 633         CacheJobInfo *job_info;
 634
 635         job_info = find_job_cache (pixbuf_cache, page);
 636         if (job_info == NULL)
 637                 return NULL;
 638
 639         /* We don't need to wait for the idle to handle the callback */
 640         if (job_info->job &&
 641             EV_JOB (job_info->job)->finished) {
 642                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 643         }
 644
 645         return job_info->pixbuf;
 646 }
 647
 648 GList *
 649 ev_pixbuf_cache_get_link_mapping (EvPixbufCache *pixbuf_cache,
 650                                   gint           page)
 651 {
 652         CacheJobInfo *job_info;
 653
 654         job_info = find_job_cache (pixbuf_cache, page);
 655         if (job_info == NULL)
 656                 return NULL;
 657
 658         /* We don't need to wait for the idle to handle the callback */
 659         if (job_info->job &&
 660             EV_JOB (job_info->job)->finished) {
 661                 copy_job_to_job_info (EV_JOB_RENDER (job_info->job), job_info, pixbuf_cache);
 662         }
 663
 664         return job_info->link_mapping;
 665 }
 666
 667 /* Selection */
 668 static guint
 669 convert_gdk_color_to_uint (GdkColor *color)
 670 {
 671         g_assert (color);
 672
 673         return 0xff << 24 |
 674                 (color->red & 0xff00) << 8 |
 675                 (color->green & 0xff00) |
 676                 (color->blue & 0xff00) >> 8;
 677 }
 678
 679 static gboolean
 680 new_selection_pixbuf_needed (EvPixbufCache *pixbuf_cache,
 681                              CacheJobInfo  *job_info,
 682                              gint           page,
 683                              gfloat         scale)
 684 {
 685         EvPageCache *page_cache;
 686         gint width, height;
 687
 688         if (job_info->selection) {
 689                 page_cache = ev_page_cache_get (pixbuf_cache->document);
 690                 ev_page_cache_get_size (page_cache, page, job_info->rc->rotation,
 691                                         scale, &width, &height);
 692
 693                 if (width != gdk_pixbuf_get_width (job_info->selection) ||
 694                     height != gdk_pixbuf_get_height (job_info->selection))
 695                         return TRUE;
 696         } else {
 697                 if (job_info->new_points.x1 >= 0)
 698                         return TRUE;
 699         }
 700         return FALSE;
 701 }
 702
 703 static void
 704 clear_selection_if_needed (EvPixbufCache *pixbuf_cache,
 705                            CacheJobInfo  *job_info,
 706                            gint           page,
 707                            gfloat         scale)
 708 {
 709         if (new_selection_pixbuf_needed (pixbuf_cache, job_info, page, scale)) {
 710                 if (job_info->selection)
 711                         g_object_unref (job_info->selection);
 712                 job_info->selection = NULL;
 713                 job_info->selection_points.x1 = -1;
 714         }
 715 }
 716
 717 GdkRegion *
 718 ev_pixbuf_cache_get_text_mapping      (EvPixbufCache *pixbuf_cache,
 719                                        gint           page)
 720 {
 721         CacheJobInfo *job_info;
 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         }
 732
 733         return job_info->text_mapping;
 734 }
 735
 736 /* Clears the cache of jobs and pixbufs.
 737  */
 738 void
 739 ev_pixbuf_cache_clear (EvPixbufCache *pixbuf_cache)
 740 {
 741         int i;
 742
 743         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 744                 dispose_cache_job_info (pixbuf_cache->prev_job + i, pixbuf_cache);
 745                 dispose_cache_job_info (pixbuf_cache->next_job + i, pixbuf_cache);
 746         }
 747
 748         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 749                 dispose_cache_job_info (pixbuf_cache->job_list + i, pixbuf_cache);
 750         }
 751 }
 752
 753
 754 void
 755 ev_pixbuf_cache_style_changed (EvPixbufCache *pixbuf_cache)
 756 {
 757         gint i;
 758
 759         /* FIXME: doesn't update running jobs. */
 760         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 761                 CacheJobInfo *job_info;
 762
 763                 job_info = pixbuf_cache->prev_job + i;
 764                 if (job_info->selection) {
 765                         g_object_unref (G_OBJECT (job_info->selection));
 766                         job_info->selection = NULL;
 767                 }
 768
 769                 job_info = pixbuf_cache->next_job + i;
 770                 if (job_info->selection) {
 771                         g_object_unref (G_OBJECT (job_info->selection));
 772                         job_info->selection = NULL;
 773                 }
 774         }
 775
 776         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 777                 CacheJobInfo *job_info;
 778
 779                 job_info = pixbuf_cache->job_list + i;
 780                 if (job_info->selection) {
 781                         g_object_unref (G_OBJECT (job_info->selection));
 782                         job_info->selection = NULL;
 783                 }
 784         }
 785 }
 786
 787 GdkPixbuf *
 788 ev_pixbuf_cache_get_selection_pixbuf (EvPixbufCache  *pixbuf_cache,
 789                                       gint            page,
 790                                       gfloat          scale,
 791                                       GdkRegion     **region)
 792 {
 793         CacheJobInfo *job_info;
 794
 795         /* the document does not implement the selection interface */
 796         if (!EV_IS_SELECTION (pixbuf_cache->document))
 797                 return NULL;
 798
 799         job_info = find_job_cache (pixbuf_cache, page);
 800         if (job_info == NULL)
 801                 return NULL;
 802
 803         /* No selection on this page */
 804         if (job_info->new_points.x1 < 0)
 805                 return NULL;
 806
 807         /* Update the rc */
 808         g_assert (job_info->rc);
 809         ev_render_context_set_scale (job_info->rc, scale);
 810
 811         /* If we have a running job, we just return what we have under the
 812          * assumption that it'll be updated later and we can scale it as need
 813          * be */
 814         if (job_info->job && EV_JOB_RENDER (job_info->job)->include_selection)
 815                 return job_info->selection;
 816
 817         /* Now, lets see if we need to resize the image.  If we do, we clear the
 818          * old one. */
 819         clear_selection_if_needed (pixbuf_cache, job_info, page, scale);
 820
 821         /* Finally, we see if the two scales are the same, and get a new pixbuf
 822          * if needed.  We do this synchronously for now.  At some point, we
 823          * _should_ be able to get rid of the doc_mutex, so the synchronicity
 824          * doesn't kill us.  Rendering a few glyphs should really be fast.
 825          */
 826         if (ev_rect_cmp (&(job_info->new_points), &(job_info->selection_points))) {
 827                 EvRectangle *old_points;
 828                 guint text, base;
 829
 830                 /* we need to get a new selection pixbuf */
 831                 ev_document_doc_mutex_lock ();
 832                 if (job_info->selection_points.x1 < 0) {
 833                         g_assert (job_info->selection == NULL);
 834                         old_points = NULL;
 835                 } else {
 836                         g_assert (job_info->selection != NULL);
 837                         old_points = &(job_info->selection_points);
 838                 }
 839
 840                 if (job_info->selection_region)
 841                         gdk_region_destroy (job_info->selection_region);
 842                 job_info->selection_region =
 843                         ev_selection_get_selection_region (EV_SELECTION (pixbuf_cache->document),
 844                                                            job_info->rc,
 845                                                            &(job_info->new_points));
 846
 847                 gtk_widget_ensure_style (pixbuf_cache->view);
 848
 849                 text = convert_gdk_color_to_uint (& (pixbuf_cache->view->style->text [GTK_STATE_SELECTED]));
 850                 base = convert_gdk_color_to_uint (& (pixbuf_cache->view->style->base [GTK_STATE_SELECTED]));
 851
 852                 ev_selection_render_selection (EV_SELECTION (pixbuf_cache->document),
 853                                                job_info->rc, &(job_info->selection),
 854                                                &(job_info->new_points),
 855                                                old_points,
 856                                                text, base);
 857                 job_info->selection_points = job_info->new_points;
 858                 ev_document_doc_mutex_unlock ();
 859         }
 860         if (region)
 861                 *region = job_info->selection_region;
 862         return job_info->selection;
 863 }
 864
 865 static void
 866 update_job_selection (CacheJobInfo    *job_info,
 867                       EvViewSelection *selection)
 868 {
 869         if (job_info->selection == NULL)
 870                 job_info->selection_points.x1 = -1;
 871         job_info->new_points = selection->rect;
 872 }
 873
 874 static void
 875 clear_job_selection (CacheJobInfo *job_info)
 876 {
 877         job_info->selection_points.x1 = -1;
 878         job_info->new_points.x1 = -1;
 879
 880         if (job_info->selection) {
 881                 g_object_unref (job_info->selection);
 882                 job_info->selection = NULL;
 883         }
 884 }
 885
 886 /* This function will reset the selection on pages that no longer have them, and
 887  * will update the target_selection on those that need it.  It will _not_ free
 888  * the previous selection_list -- that's up to caller to do.
 889  */
 890 void
 891 ev_pixbuf_cache_set_selection_list (EvPixbufCache *pixbuf_cache,
 892                                     GList         *selection_list)
 893 {
 894         EvPageCache *page_cache;
 895         EvViewSelection *selection;
 896         GList *list = selection_list;
 897         int page;
 898         int i;
 899
 900         g_return_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache));
 901
 902         page_cache = ev_page_cache_get (pixbuf_cache->document);
 903
 904         /* We check each area to see what needs updating, and what needs freeing; */
 905         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 906         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 907                 if (page < 0) {
 908                         page ++;
 909                         continue;
 910                 }
 911
 912                 selection = NULL;
 913                 while (list) {
 914                         if (((EvViewSelection *)list->data)->page == page) {
 915                                 selection = list->data;
 916                                 break;
 917                         } else if (((EvViewSelection *)list->data)->page > page)
 918                                 break;
 919                         list = list->next;
 920                 }
 921
 922                 if (selection)
 923                         update_job_selection (pixbuf_cache->prev_job + i, selection);
 924                 else
 925                         clear_job_selection (pixbuf_cache->prev_job + i);
 926                 page ++;
 927         }
 928
 929         page = pixbuf_cache->start_page;
 930         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
 931                 selection = NULL;
 932                 while (list) {
 933                         if (((EvViewSelection *)list->data)->page == page) {
 934                                 selection = list->data;
 935                                 break;
 936                         } else if (((EvViewSelection *)list->data)->page > page)
 937                                 break;
 938                         list = list->next;
 939                 }
 940
 941                 if (selection)
 942                         update_job_selection (pixbuf_cache->job_list + i, selection);
 943                 else
 944                         clear_job_selection (pixbuf_cache->job_list + i);
 945                 page ++;
 946         }
 947
 948         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 949                 if (page >= ev_page_cache_get_n_pages (page_cache))
 950                         break;
 951
 952                 selection = NULL;
 953                 while (list) {
 954                         if (((EvViewSelection *)list->data)->page == page) {
 955                                 selection = list->data;
 956                                 break;
 957                         } else if (((EvViewSelection *)list->data)->page > page)
 958                                 break;
 959                         list = list->next;
 960                 }
 961
 962                 if (selection)
 963                         update_job_selection (pixbuf_cache->next_job + i, selection);
 964                 else
 965                         clear_job_selection (pixbuf_cache->next_job + i);
 966                 page ++;
 967         }
 968 }
 969
 970
 971 /* Returns what the pixbuf cache thinks is */
 972
 973 GList *
 974 ev_pixbuf_cache_get_selection_list (EvPixbufCache *pixbuf_cache)
 975 {
 976         EvPageCache *page_cache;
 977         EvViewSelection *selection;
 978         GList *retval = NULL;
 979         int page;
 980         int i;
 981
 982         g_return_val_if_fail (EV_IS_PIXBUF_CACHE (pixbuf_cache), NULL);
 983
 984         page_cache = ev_page_cache_get (pixbuf_cache->document);
 985
 986         /* We check each area to see what needs updating, and what needs freeing; */
 987         page = pixbuf_cache->start_page - pixbuf_cache->preload_cache_size;
 988         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
 989                 if (page < 0) {
 990                         page ++;
 991                         continue;
 992                 }
 993
 994                 if (pixbuf_cache->prev_job[i].selection_points.x1 != -1) {
 995                         selection = g_new0 (EvViewSelection, 1);
 996                         selection->page = page;
 997                         selection->rect = pixbuf_cache->prev_job[i].selection_points;
 998                         if (pixbuf_cache->prev_job[i].selection_region)
 999                                 selection->covered_region = gdk_region_copy (pixbuf_cache->prev_job[i].selection_region);
1000                         retval = g_list_append (retval, selection);
1001                 }
1002
1003                 page ++;
1004         }
1005
1006         page = pixbuf_cache->start_page;
1007         for (i = 0; i < PAGE_CACHE_LEN (pixbuf_cache); i++) {
1008                 if (pixbuf_cache->job_list[i].selection_points.x1 != -1) {
1009                         selection = g_new0 (EvViewSelection, 1);
1010                         selection->page = page;
1011                         selection->rect = pixbuf_cache->job_list[i].selection_points;
1012                         if (pixbuf_cache->job_list[i].selection_region)
1013                                 selection->covered_region = gdk_region_copy (pixbuf_cache->job_list[i].selection_region);
1014                         retval = g_list_append (retval, selection);
1015                 }
1016
1017                 page ++;
1018         }
1019
1020         for (i = 0; i < pixbuf_cache->preload_cache_size; i++) {
1021                 if (page >= ev_page_cache_get_n_pages (page_cache))
1022                         break;
1023
1024                 if (pixbuf_cache->next_job[i].selection_points.x1 != -1) {
1025                         selection = g_new0 (EvViewSelection, 1);
1026                         selection->page = page;
1027                         selection->rect = pixbuf_cache->next_job[i].selection_points;
1028                         if (pixbuf_cache->next_job[i].selection_region)
1029                                 selection->covered_region = gdk_region_copy (pixbuf_cache->next_job[i].selection_region);
1030                         retval = g_list_append (retval, selection);
1031                 }
1032
1033                 page ++;
1034         }
1035
1036         return retval;
1037 }
1038