src/image-load.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 The Geeqie Team
   5  *
   6  * Author: John Ellis
   7  *
   8  * This software is released under the GNU General Public License (GNU GPL).
   9  * Please read the included file COPYING for more information.
  10  * This software comes with no warranty of any kind, use at your own risk!
  11  */
  12
  13
  14 #include "main.h"
  15 #include "image-load.h"
  16
  17 #include "exif.h"
  18 #include "filedata.h"
  19 #include "ui_fileops.h"
  20 #include "gq-marshal.h"
  21
  22 #include <fcntl.h>
  23 #include <sys/mman.h>
  24
  25
  26 /**************************************************************************************/
  27 /* image looader class */
  28
  29
  30 enum {
  31         SIGNAL_AREA_READY = 0,
  32         SIGNAL_ERROR,
  33         SIGNAL_DONE,
  34         SIGNAL_PERCENT,
  35         SIGNAL_COUNT
  36 };
  37
  38 static guint signals[SIGNAL_COUNT] = { 0 };
  39
  40 static void image_loader_init (GTypeInstance *instance, gpointer g_class);
  41 static void image_loader_class_init (ImageLoaderClass *class);
  42 static void image_loader_finalize(GObject *object);
  43 static void image_loader_stop(ImageLoader *il);
  44
  45 GType image_loader_get_type (void)
  46 {
  47         static GType type = 0;
  48         if (type == 0)
  49                 {
  50                 static const GTypeInfo info = {
  51                         sizeof (ImageLoaderClass),
  52                         NULL,   /* base_init */
  53                         NULL,   /* base_finalize */
  54                         (GClassInitFunc)image_loader_class_init, /* class_init */
  55                         NULL,   /* class_finalize */
  56                         NULL,   /* class_data */
  57                         sizeof (ImageLoader),
  58                         0,      /* n_preallocs */
  59                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  60                         NULL    /* value_table */
  61                         };
  62                 type = g_type_register_static (G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  63                 }
  64         return type;
  65 }
  66
  67 static void image_loader_init (GTypeInstance *instance, gpointer g_class)
  68 {
  69         ImageLoader *il = (ImageLoader *)instance;
  70
  71         il->pixbuf = NULL;
  72         il->idle_id = -1;
  73         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  74         il->done = FALSE;
  75         il->loader = NULL;
  76
  77         il->bytes_read = 0;
  78         il->bytes_total = 0;
  79
  80         il->idle_done_id = -1;
  81
  82         il->idle_read_loop_count = options->image.idle_read_loop_count;
  83         il->read_buffer_size = options->image.read_buffer_size;
  84         il->mapped_file = NULL;
  85
  86         il->requested_width = 0;
  87         il->requested_height = 0;
  88         il->shrunk = FALSE;
  89
  90         il->can_destroy = TRUE;
  91
  92 #ifdef HAVE_GTHREAD
  93         il->data_mutex = g_mutex_new();
  94         il->can_destroy_cond = g_cond_new();
  95 #endif
  96         DEBUG_1("new image loader %p, bufsize=%u idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
  97 }
  98
  99 static void image_loader_class_init (ImageLoaderClass *class)
 100 {
 101         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 102
 103 //      gobject_class->set_property = image_loader_set_property;
 104 //      gobject_class->get_property = image_loader_get_property;
 105
 106         gobject_class->finalize = image_loader_finalize;
 107
 108
 109         signals[SIGNAL_AREA_READY] =
 110                 g_signal_new("area_ready",
 111                              G_OBJECT_CLASS_TYPE(gobject_class),
 112                              G_SIGNAL_RUN_LAST,
 113                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 114                              NULL, NULL,
 115                              gq_marshal_VOID__INT_INT_INT_INT,
 116                              G_TYPE_NONE, 4,
 117                              G_TYPE_INT,
 118                              G_TYPE_INT,
 119                              G_TYPE_INT,
 120                              G_TYPE_INT);
 121
 122         signals[SIGNAL_ERROR] =
 123                 g_signal_new("error",
 124                              G_OBJECT_CLASS_TYPE(gobject_class),
 125                              G_SIGNAL_RUN_LAST,
 126                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 127                              NULL, NULL,
 128                              g_cclosure_marshal_VOID__VOID,
 129                              G_TYPE_NONE, 0);
 130
 131         signals[SIGNAL_DONE] =
 132                 g_signal_new("done",
 133                              G_OBJECT_CLASS_TYPE(gobject_class),
 134                              G_SIGNAL_RUN_LAST,
 135                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 136                              NULL, NULL,
 137                              g_cclosure_marshal_VOID__VOID,
 138                              G_TYPE_NONE, 0);
 139
 140         signals[SIGNAL_PERCENT] =
 141                 g_signal_new("percent",
 142                              G_OBJECT_CLASS_TYPE(gobject_class),
 143                              G_SIGNAL_RUN_LAST,
 144                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 145                              NULL, NULL,
 146                              g_cclosure_marshal_VOID__DOUBLE,
 147                              G_TYPE_NONE, 1,
 148                              G_TYPE_DOUBLE);
 149
 150 }
 151
 152 static void image_loader_finalize(GObject *object)
 153 {
 154         ImageLoader *il = (ImageLoader *)object;
 155
 156         image_loader_stop(il);
 157
 158         DEBUG_1("freeing image loader %p bytes_read=%d", il, il->bytes_read);
 159
 160         if (il->idle_done_id != -1) g_source_remove(il->idle_done_id);
 161
 162         while (g_source_remove_by_user_data(il))
 163                 {
 164                 DEBUG_1("pending signals detected");
 165                 }
 166
 167         while (il->area_param_list)
 168                 {
 169                 DEBUG_1("pending area_ready signals detected");
 170                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 171                 g_free(il->area_param_list->data);
 172                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 173                 }
 174
 175         if (il->pixbuf) gdk_pixbuf_unref(il->pixbuf);
 176         file_data_unref(il->fd);
 177 #ifdef HAVE_GTHREAD
 178         g_mutex_free(il->data_mutex);
 179         g_cond_free(il->can_destroy_cond);
 180 #endif
 181 }
 182
 183 void image_loader_free(ImageLoader *il)
 184 {
 185         if (!il) return;
 186         g_object_unref(G_OBJECT(il));
 187 }
 188
 189
 190 ImageLoader *image_loader_new(FileData *fd)
 191 {
 192         ImageLoader *il;
 193
 194         if (!fd) return NULL;
 195
 196         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 197
 198         il->fd = file_data_ref(fd);
 199
 200         return il;
 201 }
 202
 203 /**************************************************************************************/
 204 /* send signals via idle calbacks - the callback are executed in the main thread */
 205
 206 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 207 struct _ImageLoaderAreaParam {
 208         ImageLoader *il;
 209         guint x;
 210         guint y;
 211         guint w;
 212         guint h;
 213 };
 214
 215
 216 static gint image_loader_emit_area_ready_cb(gpointer data)
 217 {
 218         ImageLoaderAreaParam *par = data;
 219         ImageLoader *il = par->il;
 220         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 221         g_mutex_lock(il->data_mutex);
 222         il->area_param_list = g_list_remove(il->area_param_list, par);
 223         g_free(par);
 224         g_mutex_unlock(il->data_mutex);
 225
 226         return FALSE;
 227 }
 228
 229 static gint image_loader_emit_done_cb(gpointer data)
 230 {
 231         ImageLoader *il = data;
 232         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 233         return FALSE;
 234 }
 235
 236 static gint image_loader_emit_error_cb(gpointer data)
 237 {
 238         ImageLoader *il = data;
 239         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 240         return FALSE;
 241 }
 242
 243 static gint image_loader_emit_percent_cb(gpointer data)
 244 {
 245         ImageLoader *il = data;
 246         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 247         return FALSE;
 248 }
 249
 250 /* DONE and ERROR are emited only once, thus they can have normal priority
 251    PERCENT and AREA_READY should be processed ASAP
 252 */
 253
 254 static void image_loader_emit_done(ImageLoader *il)
 255 {
 256         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 257 }
 258
 259 static void image_loader_emit_error(ImageLoader *il)
 260 {
 261         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 262 }
 263
 264 static void image_loader_emit_percent(ImageLoader *il)
 265 {
 266         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 267 }
 268
 269 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 270 {
 271         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 272         par->il = il;
 273         par->x = x;
 274         par->y = y;
 275         par->w = w;
 276         par->h = h;
 277
 278         g_mutex_lock(il->data_mutex);
 279         il->area_param_list = g_list_prepend(il->area_param_list, par);
 280         g_mutex_unlock(il->data_mutex);
 281
 282         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 283 }
 284
 285 /**************************************************************************************/
 286 /* the following functions may be executed in separate thread */
 287
 288 static gint image_loader_get_stopping(ImageLoader *il)
 289 {
 290         gint ret;
 291         if (!il) return FALSE;
 292
 293         g_mutex_lock(il->data_mutex);
 294         ret = il->stopping;
 295         g_mutex_unlock(il->data_mutex);
 296
 297         return ret;
 298 }
 299
 300 static void image_loader_sync_pixbuf(ImageLoader *il)
 301 {
 302         GdkPixbuf *pb;
 303
 304         g_mutex_lock(il->data_mutex);
 305
 306         if (!il->loader)
 307                 {
 308                 g_mutex_unlock(il->data_mutex);
 309                 return;
 310                 }
 311
 312         pb = gdk_pixbuf_loader_get_pixbuf(il->loader);
 313
 314         if (pb == il->pixbuf)
 315                 {
 316                 g_mutex_unlock(il->data_mutex);
 317                 return;
 318                 }
 319
 320         if (il->pixbuf) gdk_pixbuf_unref(il->pixbuf);
 321         il->pixbuf = pb;
 322         if (il->pixbuf) gdk_pixbuf_ref(il->pixbuf);
 323         g_mutex_unlock(il->data_mutex);
 324 }
 325
 326 static void image_loader_area_updated_cb(GdkPixbufLoader *loader,
 327                                  guint x, guint y, guint w, guint h,
 328                                  gpointer data)
 329 {
 330         ImageLoader *il = data;
 331
 332         if (!image_loader_get_pixbuf(il))
 333                 {
 334                 image_loader_sync_pixbuf(il);
 335                 if (!image_loader_get_pixbuf(il))
 336                         {
 337                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 338                         }
 339                 }
 340         image_loader_emit_area_ready(il, x, y, w, h);
 341 }
 342
 343 static void image_loader_area_prepared_cb(GdkPixbufLoader *loader, gpointer data)
 344 {
 345         GdkPixbuf *pb;
 346         guchar *pix;
 347         size_t h, rs;
 348
 349         /* a workaround for http://bugzilla.gnome.org/show_bug.cgi?id=547669 */
 350         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 351         if (strcmp(format, "svg") == 0)
 352                 {
 353                 g_free(format);
 354                 return;
 355                 }
 356
 357         g_free(format);
 358
 359         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 360
 361         h = gdk_pixbuf_get_height(pb);
 362         rs = gdk_pixbuf_get_rowstride(pb);
 363         pix = gdk_pixbuf_get_pixels(pb);
 364
 365         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 366
 367 }
 368
 369 static void image_loader_size_cb(GdkPixbufLoader *loader,
 370                                  gint width, gint height, gpointer data)
 371 {
 372         ImageLoader *il = data;
 373         GdkPixbufFormat *format;
 374         gchar **mime_types;
 375         gint scale = FALSE;
 376         gint n;
 377
 378         g_mutex_lock(il->data_mutex);
 379         if (il->requested_width < 1 || il->requested_height < 1)
 380                 {
 381                 g_mutex_unlock(il->data_mutex);
 382                 return;
 383                 }
 384         g_mutex_unlock(il->data_mutex);
 385
 386         format = gdk_pixbuf_loader_get_format(loader);
 387         if (!format) return;
 388
 389         mime_types = gdk_pixbuf_format_get_mime_types(format);
 390         n = 0;
 391         while (mime_types[n])
 392                 {
 393                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 394                 n++;
 395                 }
 396         g_strfreev(mime_types);
 397
 398         if (!scale) return;
 399
 400         g_mutex_lock(il->data_mutex);
 401
 402         if (width > il->requested_width || height > il->requested_height)
 403                 {
 404                 gint nw, nh;
 405
 406                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 407                         {
 408                         nw = il->requested_width;
 409                         nh = (gdouble)nw / width * height;
 410                         if (nh < 1) nh = 1;
 411                         }
 412                 else
 413                         {
 414                         nh = il->requested_height;
 415                         nw = (gdouble)nh / height * width;
 416                         if (nw < 1) nw = 1;
 417                         }
 418
 419                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 420                 il->shrunk = TRUE;
 421                 }
 422         g_mutex_unlock(il->data_mutex);
 423
 424 }
 425
 426 static void image_loader_stop_loader(ImageLoader *il)
 427 {
 428         if (!il) return;
 429
 430         if (il->loader)
 431                 {
 432                 /* some loaders do not have a pixbuf till close, order is important here */
 433                 gdk_pixbuf_loader_close(il->loader, NULL);
 434                 image_loader_sync_pixbuf(il);
 435                 g_object_unref(G_OBJECT(il->loader));
 436                 il->loader = NULL;
 437                 }
 438         g_mutex_lock(il->data_mutex);
 439         il->done = TRUE;
 440         g_mutex_unlock(il->data_mutex);
 441 }
 442
 443 static void image_loader_setup_loader(ImageLoader *il)
 444 {
 445         g_mutex_lock(il->data_mutex);
 446         il->loader = gdk_pixbuf_loader_new();
 447
 448         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 449                          G_CALLBACK(image_loader_area_updated_cb), il);
 450         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 451                          G_CALLBACK(image_loader_size_cb), il);
 452         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 453                          G_CALLBACK(image_loader_area_prepared_cb), il);
 454         g_mutex_unlock(il->data_mutex);
 455 }
 456
 457
 458 static void image_loader_done(ImageLoader *il)
 459 {
 460         image_loader_stop_loader(il);
 461
 462         image_loader_emit_done(il);
 463 }
 464
 465 static void image_loader_error(ImageLoader *il)
 466 {
 467         image_loader_stop_loader(il);
 468
 469         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 470
 471         image_loader_emit_error(il);
 472 }
 473
 474 static gint image_loader_continue(ImageLoader *il)
 475 {
 476         gint b;
 477         gint c;
 478
 479         if (!il) return FALSE;
 480
 481         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 482         while (c > 0 && !image_loader_get_stopping(il))
 483                 {
 484                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 485
 486                 if (b == 0)
 487                         {
 488                         image_loader_done(il);
 489                         return FALSE;
 490                         }
 491
 492                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 493                         {
 494                         image_loader_error(il);
 495                         return FALSE;
 496                         }
 497
 498                 il->bytes_read += b;
 499
 500                 c--;
 501                 }
 502
 503         if (il->bytes_total > 0)
 504                 {
 505                 image_loader_emit_percent(il);
 506                 }
 507
 508         return TRUE;
 509 }
 510
 511 static gint image_loader_begin(ImageLoader *il)
 512 {
 513         gint b;
 514
 515         if (il->pixbuf) return FALSE;
 516
 517         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 518         if (b < 1) return FALSE;
 519
 520         image_loader_setup_loader(il);
 521
 522         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL))
 523                 {
 524                 image_loader_stop_loader(il);
 525                 return FALSE;
 526                 }
 527
 528         il->bytes_read += b;
 529
 530         /* read until size is known */
 531         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 532                 {
 533                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 534                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 535                         {
 536                         image_loader_stop_loader(il);
 537                         return FALSE;
 538                         }
 539                 il->bytes_read += b;
 540                 }
 541         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 542
 543         if (il->bytes_read == il->bytes_total || b < 1)
 544                 {
 545                 /* done, handle (broken) loaders that do not have pixbuf till close */
 546                 image_loader_stop_loader(il);
 547
 548                 if (!il->pixbuf) return FALSE;
 549
 550                 image_loader_done(il);
 551                 return TRUE;
 552                 }
 553
 554         if (!il->pixbuf)
 555                 {
 556                 image_loader_stop_loader(il);
 557                 return FALSE;
 558                 }
 559
 560         return TRUE;
 561 }
 562
 563 /**************************************************************************************/
 564 /* the following functions are always executed in the main thread */
 565
 566
 567 static gint image_loader_setup_source(ImageLoader *il)
 568 {
 569         struct stat st;
 570         gchar *pathl;
 571
 572         if (!il || il->loader || il->mapped_file) return FALSE;
 573
 574         il->mapped_file = NULL;
 575
 576         if (il->fd)
 577                 {
 578                 ExifData *exif = exif_read_fd(il->fd);
 579
 580                 il->mapped_file = exif_get_preview(exif, &il->bytes_total);
 581
 582                 if (il->mapped_file)
 583                         {
 584                         il->preview = TRUE;
 585                         DEBUG_1("Raw file %s contains embedded image", il->fd->path);
 586                         }
 587                 exif_free_fd(il->fd, exif);
 588                 }
 589
 590
 591         if (!il->mapped_file)
 592                 {
 593                 /* normal file */
 594                 gint load_fd;
 595
 596                 pathl = path_from_utf8(il->fd->path);
 597                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 598                 g_free(pathl);
 599                 if (load_fd == -1) return FALSE;
 600
 601                 if (fstat(load_fd, &st) == 0)
 602                         {
 603                         il->bytes_total = st.st_size;
 604                         }
 605                 else
 606                         {
 607                         close(load_fd);
 608                         return FALSE;
 609                         }
 610
 611                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 612                 close(load_fd);
 613                 if (il->mapped_file == MAP_FAILED)
 614                         {
 615                         il->mapped_file = 0;
 616                         return FALSE;
 617                         }
 618                 il->preview = FALSE;
 619                 }
 620
 621         return TRUE;
 622 }
 623
 624 static void image_loader_stop_source(ImageLoader *il)
 625 {
 626         if (!il) return;
 627
 628         if (il->mapped_file)
 629                 {
 630                 if (il->preview)
 631                         {
 632                         exif_free_preview(il->mapped_file);
 633                         }
 634                 else
 635                         {
 636                         munmap(il->mapped_file, il->bytes_total);
 637                         }
 638                 il->mapped_file = NULL;
 639                 }
 640 }
 641
 642 static void image_loader_stop(ImageLoader *il)
 643 {
 644         if (!il) return;
 645
 646         if (il->idle_id != -1)
 647                 {
 648                 g_source_remove(il->idle_id);
 649                 il->idle_id = -1;
 650                 }
 651
 652         if (il->thread)
 653                 {
 654                 /* stop loader in the other thread */
 655                 g_mutex_lock(il->data_mutex);
 656                 il->stopping = TRUE;
 657                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 658                 g_mutex_unlock(il->data_mutex);
 659                 }
 660
 661         image_loader_stop_loader(il);
 662         image_loader_stop_source(il);
 663
 664 }
 665
 666 /**************************************************************************************/
 667 /* execution via idle calls */
 668
 669 static gint image_loader_idle_cb(gpointer data)
 670 {
 671         gint ret = FALSE;
 672         ImageLoader *il = data;
 673         if (il->idle_id != -1)
 674                 {
 675                 ret = image_loader_continue(il);
 676                 }
 677         if (!ret)
 678                 {
 679                 image_loader_stop_source(il);
 680                 }
 681         return ret;
 682 }
 683
 684
 685 gint image_loader_start_idle(ImageLoader *il)
 686 {
 687         gint ret;
 688         if (!il) return FALSE;
 689
 690         if (!il->fd) return FALSE;
 691
 692         if (!image_loader_setup_source(il)) return FALSE;
 693
 694         ret = image_loader_begin(il);
 695
 696         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 697         return ret;
 698 }
 699
 700 /**************************************************************************************/
 701 /* execution via thread */
 702 static GThreadPool *image_loader_thread_pool = NULL;
 703
 704 static GCond *image_loader_prio_cond = NULL;
 705 static GMutex *image_loader_prio_mutex = NULL;
 706 static gint image_loader_prio_num = 0;
 707
 708
 709 static void image_loader_thread_enter_high()
 710 {
 711         g_mutex_lock(image_loader_prio_mutex);
 712         image_loader_prio_num++;
 713         g_mutex_unlock(image_loader_prio_mutex);
 714 }
 715
 716 static void image_loader_thread_leave_high()
 717 {
 718         g_mutex_lock(image_loader_prio_mutex);
 719         image_loader_prio_num--;
 720         if (image_loader_prio_num == 0) g_cond_signal(image_loader_prio_cond);
 721         g_mutex_unlock(image_loader_prio_mutex);
 722 }
 723
 724 static void image_loader_thread_wait_high()
 725 {
 726         g_mutex_lock(image_loader_prio_mutex);
 727         while (image_loader_prio_num)
 728                 {
 729                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 730                 }
 731
 732         g_mutex_unlock(image_loader_prio_mutex);
 733 }
 734
 735
 736 void image_loader_thread_run(gpointer data, gpointer user_data)
 737 {
 738         ImageLoader *il = data;
 739         gint cont;
 740
 741         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 742                 {
 743                 /* low prio, wait untill high prio tasks finishes */
 744                 image_loader_thread_wait_high();
 745                 }
 746         else
 747                 {
 748                 /* high prio */
 749                 image_loader_thread_enter_high();
 750                 }
 751
 752         cont = image_loader_begin(il);
 753
 754         if (!cont && !image_loader_get_pixbuf(il))
 755                 {
 756                 /*
 757                 loader failed, we have to send signal
 758                 (idle mode returns the image_loader_begin return value directly)
 759                 (success is always reported indirectly from image_loader_begin)
 760                 */
 761                 image_loader_emit_error(il);
 762                 }
 763
 764         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 765                 {
 766                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 767                         {
 768                         /* low prio, wait untill high prio tasks finishes */
 769                         image_loader_thread_wait_high();
 770                         }
 771                 cont = image_loader_continue(il);
 772                 }
 773         image_loader_stop_loader(il);
 774
 775         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 776                 {
 777                 /* high prio */
 778                 image_loader_thread_leave_high();
 779                 }
 780
 781         g_mutex_lock(il->data_mutex);
 782         il->can_destroy = TRUE;
 783         g_cond_signal(il->can_destroy_cond);
 784         g_mutex_unlock(il->data_mutex);
 785
 786 }
 787
 788
 789 gint image_loader_start_thread(ImageLoader *il)
 790 {
 791         if (!il) return FALSE;
 792
 793         if (!il->fd) return FALSE;
 794
 795         il->thread = TRUE;
 796
 797         if (!image_loader_setup_source(il)) return FALSE;
 798
 799         if (!image_loader_thread_pool)
 800                 {
 801                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 802                 image_loader_prio_cond = g_cond_new();
 803                 image_loader_prio_mutex = g_mutex_new();
 804                 }
 805
 806         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 807
 808         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 809         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 810
 811         return TRUE;
 812 }
 813
 814
 815 /**************************************************************************************/
 816 /* public interface */
 817
 818
 819 gint image_loader_start(ImageLoader *il)
 820 {
 821         if (!il) return FALSE;
 822
 823         if (!il->fd) return FALSE;
 824
 825 #ifdef HAVE_GTHREAD
 826         return image_loader_start_thread(il);
 827 #else
 828         return image_loader_start_idle(il);
 829 #endif
 830 }
 831
 832
 833 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 834 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 835 {
 836         GdkPixbuf *ret;
 837         if (!il) return NULL;
 838
 839         g_mutex_lock(il->data_mutex);
 840         ret = il->pixbuf;
 841         g_mutex_unlock(il->data_mutex);
 842         return ret;
 843 }
 844
 845 gchar *image_loader_get_format(ImageLoader *il)
 846 {
 847         GdkPixbufFormat *format;
 848         gchar **mimev;
 849         gchar *mime;
 850
 851         if (!il || !il->loader) return NULL;
 852
 853         format = gdk_pixbuf_loader_get_format(il->loader);
 854         if (!format) return NULL;
 855
 856         mimev = gdk_pixbuf_format_get_mime_types(format);
 857         if (!mimev) return NULL;
 858
 859         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 860         mime = g_strdup(mimev[0]);
 861         g_strfreev(mimev);
 862
 863         return mime;
 864 }
 865
 866 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 867 {
 868         if (!il) return;
 869
 870         g_mutex_lock(il->data_mutex);
 871         il->requested_width = width;
 872         il->requested_height = height;
 873         g_mutex_unlock(il->data_mutex);
 874 }
 875
 876 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 877 {
 878         if (!il) return;
 879
 880         g_mutex_lock(il->data_mutex);
 881         il->idle_read_loop_count = count ? count : 1;
 882         g_mutex_unlock(il->data_mutex);
 883 }
 884
 885 void image_loader_set_priority(ImageLoader *il, gint priority)
 886 {
 887         if (!il) return;
 888
 889         if (il->thread) return; /* can't change prio if the thread already runs */
 890         il->idle_priority = priority;
 891 }
 892
 893
 894 gdouble image_loader_get_percent(ImageLoader *il)
 895 {
 896         gdouble ret;
 897         if (!il) return 0.0;
 898
 899         g_mutex_lock(il->data_mutex);
 900         if (il->bytes_total == 0)
 901                 {
 902                 ret = 0.0;
 903                 }
 904         else
 905                 {
 906                 ret = (gdouble)il->bytes_read / il->bytes_total;
 907                 }
 908         g_mutex_unlock(il->data_mutex);
 909         return ret;
 910 }
 911
 912 gint image_loader_get_is_done(ImageLoader *il)
 913 {
 914         gint ret;
 915         if (!il) return FALSE;
 916
 917         g_mutex_lock(il->data_mutex);
 918         ret = il->done;
 919         g_mutex_unlock(il->data_mutex);
 920
 921         return ret;
 922 }
 923
 924 FileData *image_loader_get_fd(ImageLoader *il)
 925 {
 926         FileData *ret;
 927         if (!il) return NULL;
 928
 929         g_mutex_lock(il->data_mutex);
 930         ret = il->fd;
 931         g_mutex_unlock(il->data_mutex);
 932
 933         return ret;
 934 }
 935
 936 gint image_loader_get_shrunk(ImageLoader *il)
 937 {
 938         gint ret;
 939         if (!il) return FALSE;
 940
 941         g_mutex_lock(il->data_mutex);
 942         ret = il->shrunk;
 943         g_mutex_unlock(il->data_mutex);
 944         return ret;
 945 }
 946
 947
 948 /* FIXME - this can be rather slow and blocks until the size is known */
 949 gint image_load_dimensions(FileData *fd, gint *width, gint *height)
 950 {
 951         ImageLoader *il;
 952         gint success;
 953
 954         il = image_loader_new(fd);
 955
 956         success = image_loader_start_idle(il);
 957
 958         if (success && il->pixbuf)
 959                 {
 960                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
 961                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
 962                 }
 963         else
 964                 {
 965                 if (width) *width = -1;
 966                 if (height) *height = -1;
 967                 }
 968
 969         image_loader_free(il);
 970
 971         return success;
 972 }