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