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