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