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