src/image-load.cc

   1 /*
   2  * Copyright (C) 2004 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * Author: John Ellis
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "image-load.h"
  23
  24 #include <config.h>
  25
  26 #include "debug.h"
  27 #include "exif.h"
  28 #include "filedata.h"
  29 #include "gq-marshal.h"
  30 #include "image-load-collection.h"
  31 #include "image-load-dds.h"
  32 #include "image-load-external.h"
  33 #include "image-load-gdk.h"
  34 #include "image-load-libraw.h"
  35 #include "image-load-psd.h"
  36 #include "image-load-svgz.h"
  37 #include "image-load-webp.h"
  38 #include "image-load-zxscr.h"
  39 #include "misc.h"
  40 #include "options.h"
  41 #include "ui-fileops.h"
  42
  43 #ifdef HAVE_DJVU
  44         #include "image-load-djvu.h"
  45 #endif
  46 #ifdef HAVE_FFMPEGTHUMBNAILER
  47         #include "image-load-ffmpegthumbnailer.h"
  48 #endif
  49 #ifdef HAVE_HEIF
  50         #include "image-load-heif.h"
  51 #endif
  52 #ifdef HAVE_J2K
  53         #include "image-load-j2k.h"
  54 #endif
  55 #ifdef HAVE_JPEG
  56         #include "image-load-cr3.h"
  57         #include "image-load-jpeg.h"
  58 #endif
  59 #ifdef HAVE_JPEGXL
  60         #include "image-load-jpegxl.h"
  61 #endif
  62 #ifdef HAVE_PDF
  63         #include "image-load-pdf.h"
  64 #endif
  65 #ifdef HAVE_TIFF
  66         #include "image-load-tiff.h"
  67 #endif
  68
  69 #include <fcntl.h>
  70 #include <sys/mman.h>
  71
  72 enum {
  73         IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT =         4096,
  74         IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT =     1
  75 };
  76
  77 /* image loader class */
  78
  79
  80 enum {
  81         SIGNAL_AREA_READY = 0,
  82         SIGNAL_ERROR,
  83         SIGNAL_DONE,
  84         SIGNAL_PERCENT,
  85         SIGNAL_SIZE,
  86         SIGNAL_COUNT
  87 };
  88
  89 static guint signals[SIGNAL_COUNT] = { 0 };
  90
  91 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
  92 static void image_loader_class_init_wrapper(void *data, void *user_data);
  93 static void image_loader_class_init(ImageLoaderClass *loader_class);
  94 static void image_loader_finalize(GObject *object);
  95 static void image_loader_stop(ImageLoader *il);
  96
  97 GType image_loader_get_type()
  98 {
  99         static GType type = 0;
 100         if (type == 0)
 101                 {
 102                 static const GTypeInfo info = {
 103                         sizeof(ImageLoaderClass),
 104                         nullptr,   /* base_init */
 105                         nullptr,   /* base_finalize */
 106                         static_cast<GClassInitFunc>(image_loader_class_init_wrapper), /* class_init */
 107                         nullptr,   /* class_finalize */
 108                         nullptr,   /* class_data */
 109                         sizeof(ImageLoader),
 110                         0,      /* n_preallocs */
 111                         static_cast<GInstanceInitFunc>(image_loader_init), /* instance_init */
 112                         nullptr /* value_table */
 113                         };
 114                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, static_cast<GTypeFlags>(0));
 115                 }
 116         return type;
 117 }
 118
 119 static void image_loader_init(GTypeInstance *instance, gpointer)
 120 {
 121         auto il = reinterpret_cast<ImageLoader *>(instance);
 122
 123         il->pixbuf = nullptr;
 124         il->idle_id = 0;
 125         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
 126         il->done = FALSE;
 127         il->loader = nullptr;
 128
 129         il->bytes_read = 0;
 130         il->bytes_total = 0;
 131
 132         il->idle_done_id = 0;
 133
 134         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
 135         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
 136         il->mapped_file = nullptr;
 137         il->preview = IMAGE_LOADER_PREVIEW_NONE;
 138
 139         il->requested_width = 0;
 140         il->requested_height = 0;
 141         il->actual_width = 0;
 142         il->actual_height = 0;
 143         il->shrunk = FALSE;
 144
 145         il->can_destroy = TRUE;
 146
 147         il->data_mutex = g_new(GMutex, 1);
 148         g_mutex_init(il->data_mutex);
 149         il->can_destroy_cond = g_new(GCond, 1);
 150         g_cond_init(il->can_destroy_cond);
 151
 152         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", (void *)il, il->read_buffer_size, il->idle_read_loop_count);
 153 }
 154
 155 static void image_loader_class_init_wrapper(void *data, void *)
 156 {
 157         image_loader_class_init(static_cast<ImageLoaderClass *>(data));
 158 }
 159
 160 static void image_loader_class_init(ImageLoaderClass *loader_class)
 161 {
 162         GObjectClass *gobject_class = G_OBJECT_CLASS (loader_class);
 163
 164         gobject_class->finalize = image_loader_finalize;
 165
 166
 167         signals[SIGNAL_AREA_READY] =
 168                 g_signal_new("area_ready",
 169                              G_OBJECT_CLASS_TYPE(gobject_class),
 170                              G_SIGNAL_RUN_LAST,
 171                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 172                              nullptr, nullptr,
 173                              gq_marshal_VOID__INT_INT_INT_INT,
 174                              G_TYPE_NONE, 4,
 175                              G_TYPE_INT,
 176                              G_TYPE_INT,
 177                              G_TYPE_INT,
 178                              G_TYPE_INT);
 179
 180         signals[SIGNAL_ERROR] =
 181                 g_signal_new("error",
 182                              G_OBJECT_CLASS_TYPE(gobject_class),
 183                              G_SIGNAL_RUN_LAST,
 184                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 185                              nullptr, nullptr,
 186                              g_cclosure_marshal_VOID__VOID,
 187                              G_TYPE_NONE, 0);
 188
 189         signals[SIGNAL_DONE] =
 190                 g_signal_new("done",
 191                              G_OBJECT_CLASS_TYPE(gobject_class),
 192                              G_SIGNAL_RUN_LAST,
 193                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 194                              nullptr, nullptr,
 195                              g_cclosure_marshal_VOID__VOID,
 196                              G_TYPE_NONE, 0);
 197
 198         signals[SIGNAL_PERCENT] =
 199                 g_signal_new("percent",
 200                              G_OBJECT_CLASS_TYPE(gobject_class),
 201                              G_SIGNAL_RUN_LAST,
 202                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 203                              nullptr, nullptr,
 204                              g_cclosure_marshal_VOID__DOUBLE,
 205                              G_TYPE_NONE, 1,
 206                              G_TYPE_DOUBLE);
 207
 208         signals[SIGNAL_SIZE] =
 209                 g_signal_new("size_prepared",
 210                              G_OBJECT_CLASS_TYPE(gobject_class),
 211                              G_SIGNAL_RUN_LAST,
 212                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 213                              nullptr, nullptr,
 214                              gq_marshal_VOID__INT_INT,
 215                              G_TYPE_NONE, 2,
 216                              G_TYPE_INT,
 217                              G_TYPE_INT);
 218
 219 }
 220
 221 static void image_loader_finalize(GObject *object)
 222 {
 223         auto il = reinterpret_cast<ImageLoader *>(object);
 224
 225         image_loader_stop(il);
 226
 227         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 228
 229         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, (void *)il, il->bytes_read);
 230
 231         if (il->idle_done_id)
 232                 {
 233                 g_source_remove(il->idle_done_id);
 234                 il->idle_done_id = 0;
 235                 }
 236
 237         while (g_source_remove_by_user_data(il))
 238                 {
 239                 DEBUG_2("pending signals detected");
 240                 }
 241
 242         while (il->area_param_list)
 243                 {
 244                 DEBUG_1("pending area_ready signals detected");
 245                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 246                 g_free(il->area_param_list->data);
 247                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 248                 }
 249
 250         while (il->area_param_delayed_list)
 251                 {
 252                 g_free(il->area_param_delayed_list->data);
 253                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 254                 }
 255
 256         if (il->pixbuf) g_object_unref(il->pixbuf);
 257
 258         if (il->error) g_error_free(il->error);
 259
 260         file_data_unref(il->fd);
 261
 262         g_mutex_clear(il->data_mutex);
 263         g_free(il->data_mutex);
 264         g_cond_clear(il->can_destroy_cond);
 265         g_free(il->can_destroy_cond);
 266 }
 267
 268 void image_loader_free(ImageLoader *il)
 269 {
 270         if (!il) return;
 271         g_object_unref(G_OBJECT(il));
 272 }
 273
 274
 275 ImageLoader *image_loader_new(FileData *fd)
 276 {
 277         ImageLoader *il;
 278
 279         if (!fd) return nullptr;
 280
 281         il = static_cast<ImageLoader *>(g_object_new(TYPE_IMAGE_LOADER, nullptr));
 282
 283         il->fd = file_data_ref(fd);
 284
 285         return il;
 286 }
 287
 288 /**************************************************************************************/
 289 /* send signals via idle calbacks - the callback are executed in the main thread */
 290
 291 struct ImageLoaderAreaParam {
 292         ImageLoader *il;
 293         guint x;
 294         guint y;
 295         guint w;
 296         guint h;
 297 };
 298
 299
 300 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 301 {
 302         auto par = static_cast<ImageLoaderAreaParam *>(data);
 303         ImageLoader *il = par->il;
 304         guint x;
 305         guint y;
 306         guint w;
 307         guint h;
 308         g_mutex_lock(il->data_mutex);
 309         il->area_param_list = g_list_remove(il->area_param_list, par);
 310         x = par->x;
 311         y = par->y;
 312         w = par->w;
 313         h = par->h;
 314         g_free(par);
 315         g_mutex_unlock(il->data_mutex);
 316
 317         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, x, y, w, h);
 318
 319         return G_SOURCE_REMOVE;
 320 }
 321
 322 static gboolean image_loader_emit_done_cb(gpointer data)
 323 {
 324         auto il = static_cast<ImageLoader *>(data);
 325         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 326         return G_SOURCE_REMOVE;
 327 }
 328
 329 static gboolean image_loader_emit_error_cb(gpointer data)
 330 {
 331         auto il = static_cast<ImageLoader *>(data);
 332         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 333         return G_SOURCE_REMOVE;
 334 }
 335
 336 static gboolean image_loader_emit_percent_cb(gpointer data)
 337 {
 338         auto il = static_cast<ImageLoader *>(data);
 339         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 340         return G_SOURCE_REMOVE;
 341 }
 342
 343 static gboolean image_loader_emit_size_cb(gpointer data)
 344 {
 345         gint width;
 346         gint height;
 347         auto il = static_cast<ImageLoader *>(data);
 348         g_mutex_lock(il->data_mutex);
 349         width = il->actual_width;
 350         height = il->actual_height;
 351         g_mutex_unlock(il->data_mutex);
 352         g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 353         return G_SOURCE_REMOVE;
 354 }
 355
 356
 357 /* DONE and ERROR are emitted only once, thus they can have normal priority
 358    PERCENT and AREA_READY should be processed ASAP
 359 */
 360
 361 static void image_loader_emit_done(ImageLoader *il)
 362 {
 363         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, nullptr);
 364 }
 365
 366 static void image_loader_emit_error(ImageLoader *il)
 367 {
 368         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, nullptr);
 369 }
 370
 371 static void image_loader_emit_percent(ImageLoader *il)
 372 {
 373         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, nullptr);
 374 }
 375
 376 static void image_loader_emit_size(ImageLoader *il)
 377 {
 378         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_size_cb, il, nullptr);
 379 }
 380
 381 static ImageLoaderAreaParam *image_loader_queue_area_ready(ImageLoader *il, GList **list, guint x, guint y, guint w, guint h)
 382 {
 383         if (*list)
 384                 {
 385                 auto prev_par = static_cast<ImageLoaderAreaParam *>((*list)->data);
 386                 if (prev_par->x == x && prev_par->w == w &&
 387                     prev_par->y + prev_par->h == y)
 388                         {
 389                         /* we can merge the notifications */
 390                         prev_par->h += h;
 391                         return nullptr;
 392                         }
 393                 if (prev_par->x == x && prev_par->w == w &&
 394                     y + h == prev_par->y)
 395                         {
 396                         /* we can merge the notifications */
 397                         prev_par->h += h;
 398                         prev_par->y = y;
 399                         return nullptr;
 400                         }
 401                 if (prev_par->y == y && prev_par->h == h &&
 402                     prev_par->x + prev_par->w == x)
 403                         {
 404                         /* we can merge the notifications */
 405                         prev_par->w += w;
 406                         return nullptr;
 407                         }
 408                 if (prev_par->y == y && prev_par->h == h &&
 409                     x + w == prev_par->x)
 410                         {
 411                         /* we can merge the notifications */
 412                         prev_par->w += w;
 413                         prev_par->x = x;
 414                         return nullptr;
 415                         }
 416                 }
 417
 418         auto par = g_new0(ImageLoaderAreaParam, 1);
 419         par->il = il;
 420         par->x = x;
 421         par->y = y;
 422         par->w = w;
 423         par->h = h;
 424
 425         *list = g_list_prepend(*list, par);
 426         return par;
 427 }
 428
 429 /* this function expects that il->data_mutex is locked by caller */
 430 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 431 {
 432         ImageLoaderAreaParam *par = image_loader_queue_area_ready(il, &il->area_param_list, x, y, w, h);
 433
 434         if (par)
 435                 {
 436                 g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, nullptr);
 437                 }
 438 }
 439
 440 /**************************************************************************************/
 441 /* the following functions may be executed in separate thread */
 442
 443 /* this function expects that il->data_mutex is locked by caller */
 444 static void image_loader_queue_delayed_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 445 {
 446         image_loader_queue_area_ready(il, &il->area_param_delayed_list, x, y, w, h);
 447 }
 448
 449
 450
 451 static gboolean image_loader_get_stopping(ImageLoader *il)
 452 {
 453         gboolean ret;
 454         if (!il) return FALSE;
 455
 456         g_mutex_lock(il->data_mutex);
 457         ret = il->stopping;
 458         g_mutex_unlock(il->data_mutex);
 459
 460         return ret;
 461 }
 462
 463
 464 static void image_loader_sync_pixbuf(ImageLoader *il)
 465 {
 466         GdkPixbuf *pb;
 467
 468         g_mutex_lock(il->data_mutex);
 469
 470         if (!il->loader)
 471                 {
 472                 g_mutex_unlock(il->data_mutex);
 473                 return;
 474                 }
 475
 476         pb = il->backend.get_pixbuf(il->loader);
 477
 478         if (pb == il->pixbuf)
 479                 {
 480                 g_mutex_unlock(il->data_mutex);
 481                 return;
 482                 }
 483
 484         if (g_ascii_strcasecmp(".jps", il->fd->extension) == 0)
 485                 {
 486                 g_object_set_data(G_OBJECT(pb), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
 487                 }
 488
 489         if (il->pixbuf) g_object_unref(il->pixbuf);
 490
 491         il->pixbuf = pb;
 492         if (il->pixbuf) g_object_ref(il->pixbuf);
 493
 494         g_mutex_unlock(il->data_mutex);
 495 }
 496
 497 static void image_loader_area_updated_cb(gpointer,
 498                                  guint x, guint y, guint w, guint h,
 499                                  gpointer data)
 500 {
 501         auto il = static_cast<ImageLoader *>(data);
 502
 503         if (!image_loader_get_pixbuf(il))
 504                 {
 505                 image_loader_sync_pixbuf(il);
 506                 if (!image_loader_get_pixbuf(il))
 507                         {
 508                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 509                         }
 510                 }
 511
 512         g_mutex_lock(il->data_mutex);
 513         if (il->delay_area_ready)
 514                 image_loader_queue_delayed_area_ready(il, x, y, w, h);
 515         else
 516                 image_loader_emit_area_ready(il, x, y, w, h);
 517
 518         if (il->stopping) il->backend.abort(il->loader);
 519
 520         g_mutex_unlock(il->data_mutex);
 521 }
 522
 523 static void image_loader_area_prepared_cb(gpointer loader, gpointer data)
 524 {
 525         auto il = static_cast<ImageLoader *>(data);
 526         GdkPixbuf *pb;
 527         guchar *pix;
 528         size_t h;
 529         size_t rs;
 530
 531         /* a workaround for
 532            https://bugzilla.gnome.org/show_bug.cgi?id=547669
 533            https://bugzilla.gnome.org/show_bug.cgi?id=589334
 534         */
 535         gchar *format = il->backend.get_format_name(loader);
 536         if (strcmp(format, "svg") == 0 ||
 537             strcmp(format, "xpm") == 0)
 538                 {
 539                 g_free(format);
 540                 return;
 541                 }
 542
 543         g_free(format);
 544
 545         pb = il->backend.get_pixbuf(loader);
 546
 547         h = gdk_pixbuf_get_height(pb);
 548         rs = gdk_pixbuf_get_rowstride(pb);
 549         pix = gdk_pixbuf_get_pixels(pb);
 550
 551         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 552
 553 }
 554
 555 static void image_loader_size_cb(gpointer loader,
 556                                  gint width, gint height, gpointer data)
 557 {
 558         auto il = static_cast<ImageLoader *>(data);
 559         gchar **mime_types;
 560         gboolean scale = FALSE;
 561         gint n;
 562
 563         g_mutex_lock(il->data_mutex);
 564         il->actual_width = width;
 565         il->actual_height = height;
 566         if (il->requested_width < 1 || il->requested_height < 1)
 567                 {
 568                 g_mutex_unlock(il->data_mutex);
 569                 image_loader_emit_size(il);
 570                 return;
 571                 }
 572         g_mutex_unlock(il->data_mutex);
 573
 574 #ifdef HAVE_FFMPEGTHUMBNAILER
 575         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 576                 scale = TRUE;
 577 #endif
 578         mime_types = il->backend.get_format_mime_types(loader);
 579         n = 0;
 580         while (mime_types[n] && !scale)
 581                 {
 582                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 583                 n++;
 584                 }
 585         g_strfreev(mime_types);
 586
 587         if (!scale)
 588                 {
 589                 image_loader_emit_size(il);
 590                 return;
 591                 }
 592
 593         g_mutex_lock(il->data_mutex);
 594
 595         gint nw;
 596         gint nh;
 597         if (width > il->requested_width || height > il->requested_height)
 598                 {
 599
 600                 if ((static_cast<gdouble>(il->requested_width) / width) < (static_cast<gdouble>(il->requested_height) / height))
 601                         {
 602                         nw = il->requested_width;
 603                         nh = static_cast<gdouble>(nw) / width * height;
 604                         if (nh < 1) nh = 1;
 605                         }
 606                 else
 607                         {
 608                         nh = il->requested_height;
 609                         nw = static_cast<gdouble>(nh) / height * width;
 610                         if (nw < 1) nw = 1;
 611                         }
 612
 613                 il->actual_width = nw;
 614                 il->actual_height = nh;
 615                 il->backend.set_size(loader, nw, nh);
 616                 il->shrunk = TRUE;
 617                 }
 618
 619         g_mutex_unlock(il->data_mutex);
 620         image_loader_emit_size(il);
 621 }
 622
 623 static void image_loader_stop_loader(ImageLoader *il)
 624 {
 625         if (!il) return;
 626
 627         if (il->loader)
 628                 {
 629                 /* some loaders do not have a pixbuf till close, order is important here */
 630                 il->backend.close(il->loader, il->error ? nullptr : &il->error); /* we are interested in the first error only */
 631                 image_loader_sync_pixbuf(il);
 632                 il->backend.free(il->loader);
 633                 il->loader = nullptr;
 634                 }
 635         g_mutex_lock(il->data_mutex);
 636         il->done = TRUE;
 637         g_mutex_unlock(il->data_mutex);
 638 }
 639
 640 static void image_loader_setup_loader(ImageLoader *il)
 641 {
 642 #if defined HAVE_TIFF || defined HAVE_PDF || defined HAVE_HEIF || defined HAVE_DJVU
 643         gchar *format;
 644 #endif
 645
 646         gint external_preview = 1;
 647
 648         g_mutex_lock(il->data_mutex);
 649
 650         if (options->external_preview.enable)
 651                 {
 652                 gchar *cmd_line;
 653                 gchar *tilde_filename;
 654
 655                 tilde_filename = expand_tilde(options->external_preview.select);
 656
 657                 cmd_line = g_strdup_printf("\"%s\" \"%s\"" , tilde_filename, il->fd->path);
 658
 659                 external_preview = runcmd(cmd_line);
 660                 g_free(cmd_line);
 661                 g_free(tilde_filename);
 662                 }
 663
 664         if (external_preview == 0)
 665                 {
 666                 DEBUG_1("Using custom external loader");
 667                 image_loader_backend_set_external(&il->backend);
 668                 }
 669         else
 670                 {
 671 #ifdef HAVE_FFMPEGTHUMBNAILER
 672                 if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 673                         {
 674                         DEBUG_1("Using custom ffmpegthumbnailer loader");
 675                         image_loader_backend_set_ft(&il->backend);
 676                         }
 677                 else
 678 #endif
 679 #ifdef HAVE_PDF
 680                 if (il->bytes_total >= 4 &&
 681                     (memcmp(il->mapped_file + 0, "%PDF", 4) == 0))
 682                         {
 683                         DEBUG_1("Using custom pdf loader");
 684                         image_loader_backend_set_pdf(&il->backend);
 685                         }
 686                 else
 687 #endif
 688 #ifdef HAVE_HEIF
 689                 if (il->bytes_total >= 12 &&
 690                         ((memcmp(il->mapped_file + 4, "ftypheic", 8) == 0) ||
 691                         (memcmp(il->mapped_file + 4, "ftypheix", 8) == 0) ||
 692                         (memcmp(il->mapped_file + 4, "ftypmsf1", 8) == 0) ||
 693                         (memcmp(il->mapped_file + 4, "ftypmif1", 8) == 0) ||
 694                         (memcmp(il->mapped_file + 4, "ftypavif", 8) == 0)))
 695                         {
 696                         DEBUG_1("Using custom heif loader");
 697                         image_loader_backend_set_heif(&il->backend);
 698                         }
 699                 else
 700         #endif
 701         #ifdef HAVE_WEBP
 702                 if (il->bytes_total >= 12 &&
 703                         (memcmp(il->mapped_file, "RIFF", 4) == 0) &&
 704                         (memcmp(il->mapped_file + 8, "WEBP", 4) == 0))
 705                         {
 706                         DEBUG_1("Using custom webp loader");
 707                         image_loader_backend_set_webp(&il->backend);
 708                         }
 709                 else
 710 #endif
 711 #ifdef HAVE_DJVU
 712                 if (il->bytes_total >= 16 &&
 713                         (memcmp(il->mapped_file, "AT&TFORM", 8) == 0) &&
 714                         (memcmp(il->mapped_file + 12, "DJV", 3) == 0))
 715                         {
 716                         DEBUG_1("Using custom djvu loader");
 717                         image_loader_backend_set_djvu(&il->backend);
 718                         }
 719                 else
 720 #endif
 721 #ifdef HAVE_JPEG
 722                 if (il->bytes_total >= 2 && il->mapped_file[0] == 0xff && il->mapped_file[1] == 0xd8)
 723                         {
 724                         DEBUG_1("Using custom jpeg loader");
 725                         image_loader_backend_set_jpeg(&il->backend);
 726                         }
 727 #ifndef HAVE_RAW
 728                 else
 729                 if (il->bytes_total >= 11 &&
 730                         (memcmp(il->mapped_file + 4, "ftypcrx", 7) == 0) &&
 731                         (memcmp(il->mapped_file + 64, "CanonCR3", 8) == 0))
 732                         {
 733                         DEBUG_1("Using custom cr3 loader");
 734                         image_loader_backend_set_cr3(&il->backend);
 735                         }
 736 #endif
 737                 else
 738 #endif
 739 #ifdef HAVE_TIFF
 740                 if (il->bytes_total >= 10 &&
 741                     (memcmp(il->mapped_file, "MM\0*", 4) == 0 ||
 742                      memcmp(il->mapped_file, "MM\0+\0\x08\0\0", 8) == 0 ||
 743                      memcmp(il->mapped_file, "II+\0\x08\0\0\0", 8) == 0 ||
 744                      memcmp(il->mapped_file, "II*\0", 4) == 0))
 745                         {
 746                         DEBUG_1("Using custom tiff loader");
 747                         image_loader_backend_set_tiff(&il->backend);
 748                         }
 749                 else
 750 #endif
 751                 if (il->bytes_total >= 3 && il->mapped_file[0] == 0x44 && il->mapped_file[1] == 0x44 && il->mapped_file[2] == 0x53)
 752                         {
 753                         DEBUG_1("Using dds loader");
 754                         image_loader_backend_set_dds(&il->backend);
 755                         }
 756                 else
 757                 if (il->bytes_total >= 6 &&
 758                         (memcmp(il->mapped_file, "8BPS\0\x01", 6) == 0))
 759                         {
 760                         DEBUG_1("Using custom psd loader");
 761                         image_loader_backend_set_psd(&il->backend);
 762                         }
 763                 else
 764 #ifdef HAVE_J2K
 765                 if (il->bytes_total >= 12 &&
 766                         (memcmp(il->mapped_file, "\0\0\0\x0CjP\x20\x20\x0D\x0A\x87\x0A", 12) == 0))
 767                         {
 768                         DEBUG_1("Using custom j2k loader");
 769                         image_loader_backend_set_j2k(&il->backend);
 770                         }
 771                 else
 772 #endif
 773 #ifdef HAVE_JPEGXL
 774                 if (il->bytes_total >= 12 &&
 775                         (memcmp(il->mapped_file, "\0\0\0\x0C\x4A\x58\x4C\x20\x0D\x0A\x87\x0A", 12) == 0))
 776                         {
 777                         DEBUG_1("Using custom jpeg xl loader");
 778                         image_loader_backend_set_jpegxl(&il->backend);
 779                         }
 780                 else
 781                 if (il->bytes_total >= 2 &&
 782                         (memcmp(il->mapped_file, "\xFF\x0A", 2) == 0))
 783                         {
 784                         DEBUG_1("Using custom jpeg xl loader");
 785                         image_loader_backend_set_jpegxl(&il->backend);
 786                         }
 787                 else
 788 #endif
 789                 if ((il->bytes_total == 6144 || il->bytes_total == 6912) &&
 790                         (file_extension_match(il->fd->path, ".scr")))
 791                         {
 792                         DEBUG_1("Using custom zxscr loader");
 793                         image_loader_backend_set_zxscr(&il->backend);
 794                         }
 795                 else
 796                 if (il->fd->format_class == FORMAT_CLASS_COLLECTION)
 797                         {
 798                         DEBUG_1("Using custom collection loader");
 799                         image_loader_backend_set_collection(&il->backend);
 800                         }
 801                 else
 802                 if (g_strcmp0(strrchr(il->fd->path, '.'), ".svgz") == 0)
 803                         {
 804                         DEBUG_1("Using custom svgz loader");
 805                         image_loader_backend_set_svgz(&il->backend);
 806                         }
 807                 else
 808                         image_loader_backend_set_default(&il->backend);
 809                 }
 810
 811         il->loader = static_cast<void **>(il->backend.loader_new(image_loader_area_updated_cb, image_loader_size_cb, image_loader_area_prepared_cb, il));
 812
 813 #ifdef HAVE_TIFF
 814         format = il->backend.get_format_name(il->loader);
 815         if (g_strcmp0(format, "tiff") == 0)
 816                 {
 817                 il->backend.set_page_num(il->loader, il->fd->page_num);
 818                 }
 819         g_free(format);
 820 #endif
 821
 822 #ifdef HAVE_PDF
 823         format = il->backend.get_format_name(il->loader);
 824         if (g_strcmp0(format, "pdf") == 0)
 825                 {
 826                 il->backend.set_page_num(il->loader, il->fd->page_num);
 827                 }
 828         g_free(format);
 829 #endif
 830
 831 #ifdef HAVE_HEIF
 832         format = il->backend.get_format_name(il->loader);
 833         if (g_strcmp0(format, "heif") == 0)
 834                 {
 835                 il->backend.set_page_num(il->loader, il->fd->page_num);
 836                 }
 837         g_free(format);
 838 #endif
 839
 840 #ifdef HAVE_DJVU
 841         format = il->backend.get_format_name(il->loader);
 842         if (g_strcmp0(format, "djvu") == 0)
 843                 {
 844                 il->backend.set_page_num(il->loader, il->fd->page_num);
 845                 }
 846         g_free(format);
 847 #endif
 848
 849         il->fd->format_name = il->backend.get_format_name(il->loader);
 850
 851         g_mutex_unlock(il->data_mutex);
 852 }
 853
 854
 855 static void image_loader_done(ImageLoader *il)
 856 {
 857         image_loader_stop_loader(il);
 858
 859         image_loader_emit_done(il);
 860 }
 861
 862 static void image_loader_error(ImageLoader *il)
 863 {
 864         image_loader_stop_loader(il);
 865
 866         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 867
 868         image_loader_emit_error(il);
 869 }
 870
 871 static gboolean image_loader_continue(ImageLoader *il)
 872 {
 873         gint b;
 874         gint c;
 875
 876         if (!il) return G_SOURCE_REMOVE;
 877
 878         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 879         while (c > 0 && !image_loader_get_stopping(il))
 880                 {
 881                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 882
 883                 if (b == 0)
 884                         {
 885                         image_loader_done(il);
 886                         return G_SOURCE_REMOVE;
 887                         }
 888
 889                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 890                         {
 891                         image_loader_error(il);
 892                         return G_SOURCE_REMOVE;
 893                         }
 894
 895                 il->bytes_read += b;
 896
 897                 c--;
 898                 }
 899
 900         if (il->bytes_total > 0)
 901                 {
 902                 image_loader_emit_percent(il);
 903                 }
 904
 905         return G_SOURCE_CONTINUE;
 906 }
 907
 908 static gboolean image_loader_begin(ImageLoader *il)
 909 {
 910 #if defined HAVE_TIFF || defined HAVE_PDF || defined HAVE_HEIF || defined HAVE_DJVU
 911         gchar *format;
 912 #endif
 913         gssize b;
 914
 915         if (il->pixbuf) return FALSE;
 916
 917         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 918         if (b < 1) return FALSE;
 919
 920         image_loader_setup_loader(il);
 921
 922         g_assert(il->bytes_read == 0);
 923         if (il->backend.load) {
 924                 b = il->bytes_total;
 925                 if (!il->backend.load(il->loader, il->mapped_file, b, &il->error))
 926                         {
 927                         image_loader_stop_loader(il);
 928                         return FALSE;
 929                         }
 930         }
 931         else if (!il->backend.write(il->loader, il->mapped_file, b, &il->error))
 932                 {
 933                 image_loader_stop_loader(il);
 934                 return FALSE;
 935                 }
 936
 937 #ifdef HAVE_PDF
 938         format = il->backend.get_format_name(il->loader);
 939         if (g_strcmp0(format, "pdf") == 0)
 940                 {
 941                 gint i = il->backend.get_page_total(il->loader);
 942                 file_data_set_page_total(il->fd, i);
 943                 }
 944         g_free(format);
 945 #endif
 946 #ifdef HAVE_HEIF
 947         format = il->backend.get_format_name(il->loader);
 948         if (g_strcmp0(format, "heif") == 0)
 949                 {
 950                 gint i = il->backend.get_page_total(il->loader);
 951                 file_data_set_page_total(il->fd, i);
 952                 }
 953         g_free(format);
 954 #endif
 955 #ifdef HAVE_DJVU
 956         format = il->backend.get_format_name(il->loader);
 957         if (g_strcmp0(format, "djvu") == 0)
 958                 {
 959                 gint i = il->backend.get_page_total(il->loader);
 960                 file_data_set_page_total(il->fd, i);
 961                 }
 962         g_free(format);
 963 #endif
 964 #ifdef HAVE_TIFF
 965         format = il->backend.get_format_name(il->loader);
 966         if (g_strcmp0(format, "tiff") == 0)
 967                 {
 968                 gint i = il->backend.get_page_total(il->loader);
 969                 file_data_set_page_total(il->fd, i);
 970                 }
 971         g_free(format);
 972 #endif
 973
 974         il->bytes_read += b;
 975
 976         /* read until size is known */
 977         while (il->loader && !il->backend.get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 978                 {
 979                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 980                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 981                         {
 982                         image_loader_stop_loader(il);
 983                         return FALSE;
 984                         }
 985                 il->bytes_read += b;
 986                 }
 987         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 988
 989         if (il->bytes_read == il->bytes_total || b < 1)
 990                 {
 991                 /* done, handle (broken) loaders that do not have pixbuf till close */
 992                 image_loader_stop_loader(il);
 993
 994                 if (!il->pixbuf) return FALSE;
 995
 996                 image_loader_done(il);
 997                 return TRUE;
 998                 }
 999
1000         if (!il->pixbuf)
1001                 {
1002                 image_loader_stop_loader(il);
1003                 return FALSE;
1004                 }
1005
1006         return TRUE;
1007 }
1008
1009 /**************************************************************************************/
1010 /* the following functions are always executed in the main thread */
1011
1012
1013 static gboolean image_loader_setup_source(ImageLoader *il)
1014 {
1015         struct stat st;
1016         gchar *pathl;
1017
1018         if (!il || il->loader || il->mapped_file) return FALSE;
1019
1020         il->mapped_file = nullptr;
1021
1022         if (il->fd)
1023                 {
1024                 ExifData *exif = exif_read_fd(il->fd);
1025
1026                 if (options->thumbnails.use_exif)
1027                         {
1028                         il->mapped_file = exif_get_preview(exif, reinterpret_cast<guint *>(&il->bytes_total), il->requested_width, il->requested_height);
1029
1030                         if (il->mapped_file)
1031                                 {
1032                                 il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1033                                 }
1034                         }
1035                 else
1036                         {
1037                         il->mapped_file = libraw_get_preview(il, reinterpret_cast<guint *>(&il->bytes_total));
1038
1039                         if (il->mapped_file)
1040                                 {
1041                                 /* Both exiv2 and libraw sometimes return a pointer to a file
1042                                  * section that is not a jpeg */
1043                                 if (il->mapped_file[0] != 0xFF || il->mapped_file[1] != 0xD8)
1044                                         {
1045                                         il->mapped_file = nullptr;
1046                                         }
1047                                 else
1048                                         {
1049                                         il->preview = IMAGE_LOADER_PREVIEW_LIBRAW;
1050                                         }
1051                                 }
1052                         }
1053
1054                 /* If libraw does not find a thumbnail, try exiv2 */
1055                 if (!il->mapped_file)
1056                         {
1057                         il->mapped_file = exif_get_preview(exif, reinterpret_cast<guint *>(&il->bytes_total), 0, 0); /* get the largest available preview image or NULL for normal images*/
1058
1059                         if (il->mapped_file)
1060                                 {
1061                                 /* Both exiv2 and libraw sometimes return a pointer to a file
1062                                  * section that is not a jpeg */
1063                                 if (il->mapped_file[0] != 0xFF || il->mapped_file[1] != 0xD8)
1064                                         {
1065                                         il->mapped_file = nullptr;
1066                                         }
1067                                 else
1068                                         {
1069                                         il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1070                                         }
1071                                 }
1072                         }
1073
1074                 if (il->mapped_file)
1075                         {
1076                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
1077                         }
1078                 exif_free_fd(il->fd, exif);
1079                 }
1080
1081
1082         if (!il->mapped_file)
1083                 {
1084                 /* normal file */
1085                 gint load_fd;
1086
1087                 pathl = path_from_utf8(il->fd->path);
1088                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
1089                 g_free(pathl);
1090                 if (load_fd == -1) return FALSE;
1091
1092                 if (fstat(load_fd, &st) == 0)
1093                         {
1094                         il->bytes_total = st.st_size;
1095                         }
1096                 else
1097                         {
1098                         close(load_fd);
1099                         return FALSE;
1100                         }
1101
1102                 il->mapped_file = static_cast<guchar *>(mmap(nullptr, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0));
1103                 close(load_fd);
1104                 if (il->mapped_file == MAP_FAILED)
1105                         {
1106                         il->mapped_file = nullptr;
1107                         return FALSE;
1108                         }
1109                 il->preview = IMAGE_LOADER_PREVIEW_NONE;
1110                 }
1111
1112         return TRUE;
1113 }
1114
1115 static void image_loader_stop_source(ImageLoader *il)
1116 {
1117         if (!il) return;
1118
1119         if (il->mapped_file)
1120                 {
1121                 if (il->preview == IMAGE_LOADER_PREVIEW_EXIF)
1122                         {
1123                         exif_free_preview(il->mapped_file);
1124                         }
1125                 else if (il->preview == IMAGE_LOADER_PREVIEW_LIBRAW)
1126                         {
1127                         libraw_free_preview(il->mapped_file);
1128                         }
1129                 else
1130                         {
1131                         munmap(il->mapped_file, il->bytes_total);
1132                         }
1133                 il->mapped_file = nullptr;
1134                 }
1135 }
1136
1137 static void image_loader_stop(ImageLoader *il)
1138 {
1139         if (!il) return;
1140
1141         if (il->idle_id)
1142                 {
1143                 g_source_remove(il->idle_id);
1144                 il->idle_id = 0;
1145                 }
1146
1147         if (il->thread)
1148                 {
1149                 /* stop loader in the other thread */
1150                 g_mutex_lock(il->data_mutex);
1151                 il->stopping = TRUE;
1152                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
1153                 g_mutex_unlock(il->data_mutex);
1154                 }
1155
1156         image_loader_stop_loader(il);
1157         image_loader_stop_source(il);
1158
1159 }
1160
1161 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
1162 {
1163         g_mutex_lock(il->data_mutex);
1164         il->delay_area_ready = enable;
1165         if (!enable)
1166                 {
1167                 /* send delayed */
1168                 GList *list;
1169                 GList *work;
1170                 list = g_list_reverse(il->area_param_delayed_list);
1171                 il->area_param_delayed_list = nullptr;
1172                 g_mutex_unlock(il->data_mutex);
1173
1174                 work = list;
1175
1176                 while (work)
1177                         {
1178                         auto par = static_cast<ImageLoaderAreaParam *>(work->data);
1179                         work = work->next;
1180
1181                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
1182                         }
1183                 g_list_free_full(list, g_free);
1184                 }
1185         else
1186                 {
1187                 /* just unlock */
1188                 g_mutex_unlock(il->data_mutex);
1189                 }
1190 }
1191
1192
1193 /**************************************************************************************/
1194 /* execution via idle calls */
1195
1196 static gboolean image_loader_idle_cb(gpointer data)
1197 {
1198         gboolean ret = G_SOURCE_REMOVE;
1199         auto il = static_cast<ImageLoader *>(data);
1200
1201         if (il->idle_id)
1202                 {
1203                 ret = image_loader_continue(il);
1204                 }
1205
1206         if (!ret)
1207                 {
1208                 image_loader_stop_source(il);
1209                 }
1210
1211         return ret;
1212 }
1213
1214 static gboolean image_loader_start_idle(ImageLoader *il)
1215 {
1216         gboolean ret;
1217
1218         if (!il) return FALSE;
1219
1220         if (!il->fd) return FALSE;
1221
1222         if (!image_loader_setup_source(il)) return FALSE;
1223
1224         ret = image_loader_begin(il);
1225
1226         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, nullptr);
1227         return ret;
1228 }
1229
1230 /**************************************************************************************/
1231 /* execution via thread */
1232
1233 static GThreadPool *image_loader_thread_pool = nullptr;
1234
1235 static GCond *image_loader_prio_cond = nullptr;
1236 static GMutex *image_loader_prio_mutex = nullptr;
1237 static gint image_loader_prio_num = 0;
1238
1239
1240 static void image_loader_thread_enter_high()
1241 {
1242         g_mutex_lock(image_loader_prio_mutex);
1243         image_loader_prio_num++;
1244         g_mutex_unlock(image_loader_prio_mutex);
1245 }
1246
1247 static void image_loader_thread_leave_high()
1248 {
1249         g_mutex_lock(image_loader_prio_mutex);
1250         image_loader_prio_num--;
1251         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
1252         g_mutex_unlock(image_loader_prio_mutex);
1253 }
1254
1255 static void image_loader_thread_wait_high()
1256 {
1257         g_mutex_lock(image_loader_prio_mutex);
1258         while (image_loader_prio_num)
1259                 {
1260                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
1261                 }
1262
1263         g_mutex_unlock(image_loader_prio_mutex);
1264 }
1265
1266
1267 static void image_loader_thread_run(gpointer data, gpointer)
1268 {
1269         auto il = static_cast<ImageLoader *>(data);
1270         gboolean cont;
1271         gboolean err;
1272
1273         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1274                 {
1275                 /* low prio, wait until high prio tasks finishes */
1276                 image_loader_thread_wait_high();
1277                 }
1278         else
1279                 {
1280                 /* high prio */
1281                 image_loader_thread_enter_high();
1282                 }
1283
1284         err = !image_loader_begin(il);
1285
1286         if (err)
1287                 {
1288                 /*
1289                 loader failed, we have to send signal
1290                 (idle mode returns the image_loader_begin return value directly)
1291                 (success is always reported indirectly from image_loader_begin)
1292                 */
1293                 image_loader_emit_error(il);
1294                 }
1295
1296         cont = !err;
1297
1298         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
1299                 {
1300                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1301                         {
1302                         /* low prio, wait until high prio tasks finishes */
1303                         image_loader_thread_wait_high();
1304                         }
1305                 cont = image_loader_continue(il);
1306                 }
1307         image_loader_stop_loader(il);
1308
1309         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
1310                 {
1311                 /* high prio */
1312                 image_loader_thread_leave_high();
1313                 }
1314
1315         g_mutex_lock(il->data_mutex);
1316         il->can_destroy = TRUE;
1317         g_cond_signal(il->can_destroy_cond);
1318         g_mutex_unlock(il->data_mutex);
1319
1320 }
1321
1322
1323 static gboolean image_loader_start_thread(ImageLoader *il)
1324 {
1325         if (!il) return FALSE;
1326
1327         if (!il->fd) return FALSE;
1328
1329         il->thread = TRUE;
1330
1331         if (!image_loader_setup_source(il)) return FALSE;
1332
1333         if (!image_loader_thread_pool)
1334                 {
1335                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, nullptr, -1, FALSE, nullptr);
1336                 if (!image_loader_prio_cond) image_loader_prio_cond = g_new(GCond, 1);
1337                 g_cond_init(image_loader_prio_cond);
1338                 if (!image_loader_prio_mutex) image_loader_prio_mutex = g_new(GMutex, 1);
1339                 g_mutex_init(image_loader_prio_mutex);
1340                 }
1341
1342         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
1343
1344         g_thread_pool_push(image_loader_thread_pool, il, nullptr);
1345         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
1346
1347         return TRUE;
1348 }
1349
1350
1351 /**************************************************************************************/
1352 /* public interface */
1353
1354
1355 gboolean image_loader_start(ImageLoader *il)
1356 {
1357         if (!il) return FALSE;
1358
1359         if (!il->fd) return FALSE;
1360
1361         return image_loader_start_thread(il);
1362 }
1363
1364
1365 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
1366 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
1367 {
1368         GdkPixbuf *ret;
1369         if (!il) return nullptr;
1370
1371         g_mutex_lock(il->data_mutex);
1372         ret = il->pixbuf;
1373         g_mutex_unlock(il->data_mutex);
1374         return ret;
1375 }
1376
1377 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
1378 {
1379         if (!il) return;
1380
1381         g_mutex_lock(il->data_mutex);
1382         il->requested_width = width;
1383         il->requested_height = height;
1384         g_mutex_unlock(il->data_mutex);
1385 }
1386
1387 void image_loader_set_buffer_size(ImageLoader *il, guint count)
1388 {
1389         if (!il) return;
1390
1391         g_mutex_lock(il->data_mutex);
1392         il->idle_read_loop_count = count ? count : 1;
1393         g_mutex_unlock(il->data_mutex);
1394 }
1395
1396 void image_loader_set_priority(ImageLoader *il, gint priority)
1397 {
1398         if (!il) return;
1399
1400         if (il->thread) return; /* can't change prio if the thread already runs */
1401         il->idle_priority = priority;
1402 }
1403
1404
1405 gdouble image_loader_get_percent(ImageLoader *il)
1406 {
1407         gdouble ret;
1408         if (!il) return 0.0;
1409
1410         g_mutex_lock(il->data_mutex);
1411         if (il->bytes_total == 0)
1412                 {
1413                 ret = 0.0;
1414                 }
1415         else
1416                 {
1417                 ret = static_cast<gdouble>(il->bytes_read) / il->bytes_total;
1418                 }
1419         g_mutex_unlock(il->data_mutex);
1420         return ret;
1421 }
1422
1423 gboolean image_loader_get_is_done(ImageLoader *il)
1424 {
1425         gboolean ret;
1426         if (!il) return FALSE;
1427
1428         g_mutex_lock(il->data_mutex);
1429         ret = il->done;
1430         g_mutex_unlock(il->data_mutex);
1431
1432         return ret;
1433 }
1434
1435 FileData *image_loader_get_fd(ImageLoader *il)
1436 {
1437         FileData *ret;
1438         if (!il) return nullptr;
1439
1440         g_mutex_lock(il->data_mutex);
1441         ret = il->fd;
1442         g_mutex_unlock(il->data_mutex);
1443
1444         return ret;
1445 }
1446
1447 gboolean image_loader_get_shrunk(ImageLoader *il)
1448 {
1449         gboolean ret;
1450         if (!il) return FALSE;
1451
1452         g_mutex_lock(il->data_mutex);
1453         ret = il->shrunk;
1454         g_mutex_unlock(il->data_mutex);
1455         return ret;
1456 }
1457
1458 const gchar *image_loader_get_error(ImageLoader *il)
1459 {
1460         const gchar *ret = nullptr;
1461         if (!il) return nullptr;
1462         g_mutex_lock(il->data_mutex);
1463         if (il->error) ret = il->error->message;
1464         g_mutex_unlock(il->data_mutex);
1465         return ret;
1466 }
1467
1468
1469 /**
1470  *  @FIXME this can be rather slow and blocks until the size is known
1471  */
1472 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1473 {
1474         ImageLoader *il;
1475         gboolean success;
1476
1477         il = image_loader_new(fd);
1478
1479         success = image_loader_start_idle(il);
1480
1481         if (success && il->pixbuf)
1482                 {
1483                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1484                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1485                 }
1486         else
1487                 {
1488                 if (width) *width = -1;
1489                 if (height) *height = -1;
1490                 }
1491
1492         image_loader_free(il);
1493
1494         return success;
1495 }
1496 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */