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 <fcntl.h>
  25 #include <sys/mman.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28
  29 #include <cstring>
  30
  31 #include <config.h>
  32
  33 #include "debug.h"
  34 #include "exif.h"
  35 #include "filedata.h"
  36 #include "gq-marshal.h"
  37 #include "image-load-collection.h"
  38 #include "image-load-dds.h"
  39 #if HAVE_DJVU
  40 #  include "image-load-djvu.h"
  41 #endif
  42 #include "image-load-external.h"
  43 #if HAVE_FFMPEGTHUMBNAILER
  44 #  include "image-load-ffmpegthumbnailer.h"
  45 #endif
  46 #include "image-load-gdk.h"
  47 #if HAVE_HEIF
  48 #  include "image-load-heif.h"
  49 #endif
  50 #if HAVE_J2K
  51 #  include "image-load-j2k.h"
  52 #endif
  53 #if HAVE_JPEG
  54 #  if !HAVE_RAW
  55 #    include "image-load-cr3.h"
  56 #  endif
  57 #  include "image-load-jpeg.h"
  58 #endif
  59 #if HAVE_JPEGXL
  60 #  include "image-load-jpegxl.h"
  61 #endif
  62 #include "image-load-libraw.h"
  63 #if HAVE_PDF
  64 #  include "image-load-pdf.h"
  65 #endif
  66 #include "image-load-psd.h"
  67 #include "image-load-svgz.h"
  68 #if HAVE_TIFF
  69 #  include "image-load-tiff.h"
  70 #endif
  71 #include "image-load-webp.h"
  72 #include "image-load-zxscr.h"
  73 #include "misc.h"
  74 #include "options.h"
  75 #include "typedefs.h"
  76 #include "ui-fileops.h"
  77
  78 struct ExifData;
  79
  80 enum {
  81         IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT =         4096,
  82         IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT =     1
  83 };
  84
  85 /* image loader class */
  86
  87
  88 enum {
  89         SIGNAL_AREA_READY = 0,
  90         SIGNAL_ERROR,
  91         SIGNAL_DONE,
  92         SIGNAL_PERCENT,
  93         SIGNAL_SIZE,
  94         SIGNAL_COUNT
  95 };
  96
  97 static guint signals[SIGNAL_COUNT] = { 0 };
  98
  99 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
 100 static void image_loader_class_init_wrapper(void *data, void *user_data);
 101 static void image_loader_class_init(ImageLoaderClass *loader_class);
 102 static void image_loader_finalize(GObject *object);
 103 static void image_loader_stop(ImageLoader *il);
 104
 105 GType image_loader_get_type()
 106 {
 107         static GType type = 0;
 108         if (type == 0)
 109                 {
 110                 static const GTypeInfo info = {
 111                         sizeof(ImageLoaderClass),
 112                         nullptr,   /* base_init */
 113                         nullptr,   /* base_finalize */
 114                         static_cast<GClassInitFunc>(image_loader_class_init_wrapper), /* class_init */
 115                         nullptr,   /* class_finalize */
 116                         nullptr,   /* class_data */
 117                         sizeof(ImageLoader),
 118                         0,      /* n_preallocs */
 119                         static_cast<GInstanceInitFunc>(image_loader_init), /* instance_init */
 120                         nullptr /* value_table */
 121                         };
 122                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, static_cast<GTypeFlags>(0));
 123                 }
 124         return type;
 125 }
 126
 127 static void image_loader_init(GTypeInstance *instance, gpointer)
 128 {
 129         auto il = reinterpret_cast<ImageLoader *>(instance);
 130
 131         il->pixbuf = nullptr;
 132         il->idle_id = 0;
 133         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
 134         il->done = FALSE;
 135         il->loader = nullptr;
 136
 137         il->bytes_read = 0;
 138         il->bytes_total = 0;
 139
 140         il->idle_done_id = 0;
 141
 142         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
 143         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
 144         il->mapped_file = nullptr;
 145         il->preview = IMAGE_LOADER_PREVIEW_NONE;
 146
 147         il->requested_width = 0;
 148         il->requested_height = 0;
 149         il->actual_width = 0;
 150         il->actual_height = 0;
 151         il->shrunk = FALSE;
 152
 153         il->can_destroy = TRUE;
 154
 155         il->data_mutex = g_new(GMutex, 1);
 156         g_mutex_init(il->data_mutex);
 157         il->can_destroy_cond = g_new(GCond, 1);
 158         g_cond_init(il->can_destroy_cond);
 159
 160         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", (void *)il, il->read_buffer_size, il->idle_read_loop_count);
 161 }
 162
 163 static void image_loader_class_init_wrapper(void *data, void *)
 164 {
 165         image_loader_class_init(static_cast<ImageLoaderClass *>(data));
 166 }
 167
 168 static void image_loader_class_init(ImageLoaderClass *loader_class)
 169 {
 170         GObjectClass *gobject_class = G_OBJECT_CLASS (loader_class);
 171
 172         gobject_class->finalize = image_loader_finalize;
 173
 174
 175         signals[SIGNAL_AREA_READY] =
 176                 g_signal_new("area_ready",
 177                              G_OBJECT_CLASS_TYPE(gobject_class),
 178                              G_SIGNAL_RUN_LAST,
 179                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 180                              nullptr, nullptr,
 181                              gq_marshal_VOID__INT_INT_INT_INT,
 182                              G_TYPE_NONE, 4,
 183                              G_TYPE_INT,
 184                              G_TYPE_INT,
 185                              G_TYPE_INT,
 186                              G_TYPE_INT);
 187
 188         signals[SIGNAL_ERROR] =
 189                 g_signal_new("error",
 190                              G_OBJECT_CLASS_TYPE(gobject_class),
 191                              G_SIGNAL_RUN_LAST,
 192                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 193                              nullptr, nullptr,
 194                              g_cclosure_marshal_VOID__VOID,
 195                              G_TYPE_NONE, 0);
 196
 197         signals[SIGNAL_DONE] =
 198                 g_signal_new("done",
 199                              G_OBJECT_CLASS_TYPE(gobject_class),
 200                              G_SIGNAL_RUN_LAST,
 201                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 202                              nullptr, nullptr,
 203                              g_cclosure_marshal_VOID__VOID,
 204                              G_TYPE_NONE, 0);
 205
 206         signals[SIGNAL_PERCENT] =
 207                 g_signal_new("percent",
 208                              G_OBJECT_CLASS_TYPE(gobject_class),
 209                              G_SIGNAL_RUN_LAST,
 210                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 211                              nullptr, nullptr,
 212                              g_cclosure_marshal_VOID__DOUBLE,
 213                              G_TYPE_NONE, 1,
 214                              G_TYPE_DOUBLE);
 215
 216         signals[SIGNAL_SIZE] =
 217                 g_signal_new("size_prepared",
 218                              G_OBJECT_CLASS_TYPE(gobject_class),
 219                              G_SIGNAL_RUN_LAST,
 220                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 221                              nullptr, nullptr,
 222                              gq_marshal_VOID__INT_INT,
 223                              G_TYPE_NONE, 2,
 224                              G_TYPE_INT,
 225                              G_TYPE_INT);
 226
 227 }
 228
 229 static void image_loader_finalize(GObject *object)
 230 {
 231         auto il = reinterpret_cast<ImageLoader *>(object);
 232
 233         image_loader_stop(il);
 234
 235         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 236
 237         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, (void *)il, il->bytes_read);
 238
 239         if (il->idle_done_id)
 240                 {
 241                 g_source_remove(il->idle_done_id);
 242                 il->idle_done_id = 0;
 243                 }
 244
 245         while (g_source_remove_by_user_data(il))
 246                 {
 247                 DEBUG_2("pending signals detected");
 248                 }
 249
 250         while (il->area_param_list)
 251                 {
 252                 DEBUG_1("pending area_ready signals detected");
 253                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 254                 g_free(il->area_param_list->data);
 255                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 256                 }
 257
 258         while (il->area_param_delayed_list)
 259                 {
 260                 g_free(il->area_param_delayed_list->data);
 261                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 262                 }
 263
 264         if (il->pixbuf) g_object_unref(il->pixbuf);
 265
 266         if (il->error) g_error_free(il->error);
 267
 268         file_data_unref(il->fd);
 269
 270         g_mutex_clear(il->data_mutex);
 271         g_free(il->data_mutex);
 272         g_cond_clear(il->can_destroy_cond);
 273         g_free(il->can_destroy_cond);
 274 }
 275
 276 void image_loader_free(ImageLoader *il)
 277 {
 278         if (!il) return;
 279         g_object_unref(G_OBJECT(il));
 280 }
 281
 282
 283 ImageLoader *image_loader_new(FileData *fd)
 284 {
 285         ImageLoader *il;
 286
 287         if (!fd) return nullptr;
 288
 289         il = static_cast<ImageLoader *>(g_object_new(TYPE_IMAGE_LOADER, nullptr));
 290
 291         il->fd = file_data_ref(fd);
 292
 293         return il;
 294 }
 295
 296 /**************************************************************************************/
 297 /* send signals via idle calbacks - the callback are executed in the main thread */
 298
 299 struct ImageLoaderAreaParam {
 300         ImageLoader *il;
 301         guint x;
 302         guint y;
 303         guint w;
 304         guint h;
 305 };
 306
 307
 308 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 309 {
 310         auto par = static_cast<ImageLoaderAreaParam *>(data);
 311         ImageLoader *il = par->il;
 312         guint x;
 313         guint y;
 314         guint w;
 315         guint h;
 316         g_mutex_lock(il->data_mutex);
 317         il->area_param_list = g_list_remove(il->area_param_list, par);
 318         x = par->x;
 319         y = par->y;
 320         w = par->w;
 321         h = par->h;
 322         g_free(par);
 323         g_mutex_unlock(il->data_mutex);
 324
 325         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, x, y, w, h);
 326
 327         return G_SOURCE_REMOVE;
 328 }
 329
 330 static gboolean image_loader_emit_done_cb(gpointer data)
 331 {
 332         auto il = static_cast<ImageLoader *>(data);
 333         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 334         return G_SOURCE_REMOVE;
 335 }
 336
 337 static gboolean image_loader_emit_error_cb(gpointer data)
 338 {
 339         auto il = static_cast<ImageLoader *>(data);
 340         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 341         return G_SOURCE_REMOVE;
 342 }
 343
 344 static gboolean image_loader_emit_percent_cb(gpointer data)
 345 {
 346         auto il = static_cast<ImageLoader *>(data);
 347         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 348         return G_SOURCE_REMOVE;
 349 }
 350
 351 static gboolean image_loader_emit_size_cb(gpointer data)
 352 {
 353         gint width;
 354         gint height;
 355         auto il = static_cast<ImageLoader *>(data);
 356         g_mutex_lock(il->data_mutex);
 357         width = il->actual_width;
 358         height = il->actual_height;
 359         g_mutex_unlock(il->data_mutex);
 360         g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 361         return G_SOURCE_REMOVE;
 362 }
 363
 364
 365 /* DONE and ERROR are emitted only once, thus they can have normal priority
 366    PERCENT and AREA_READY should be processed ASAP
 367 */
 368
 369 static void image_loader_emit_done(ImageLoader *il)
 370 {
 371         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, nullptr);
 372 }
 373
 374 static void image_loader_emit_error(ImageLoader *il)
 375 {
 376         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, nullptr);
 377 }
 378
 379 static void image_loader_emit_percent(ImageLoader *il)
 380 {
 381         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, nullptr);
 382 }
 383
 384 static void image_loader_emit_size(ImageLoader *il)
 385 {
 386         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_size_cb, il, nullptr);
 387 }
 388
 389 static ImageLoaderAreaParam *image_loader_queue_area_ready(ImageLoader *il, GList **list, guint x, guint y, guint w, guint h)
 390 {
 391         if (*list)
 392                 {
 393                 auto prev_par = static_cast<ImageLoaderAreaParam *>((*list)->data);
 394                 if (prev_par->x == x && prev_par->w == w &&
 395                     prev_par->y + prev_par->h == y)
 396                         {
 397                         /* we can merge the notifications */
 398                         prev_par->h += h;
 399                         return nullptr;
 400                         }
 401                 if (prev_par->x == x && prev_par->w == w &&
 402                     y + h == prev_par->y)
 403                         {
 404                         /* we can merge the notifications */
 405                         prev_par->h += h;
 406                         prev_par->y = y;
 407                         return nullptr;
 408                         }
 409                 if (prev_par->y == y && prev_par->h == h &&
 410                     prev_par->x + prev_par->w == x)
 411                         {
 412                         /* we can merge the notifications */
 413                         prev_par->w += w;
 414                         return nullptr;
 415                         }
 416                 if (prev_par->y == y && prev_par->h == h &&
 417                     x + w == prev_par->x)
 418                         {
 419                         /* we can merge the notifications */
 420                         prev_par->w += w;
 421                         prev_par->x = x;
 422                         return nullptr;
 423                         }
 424                 }
 425
 426         auto par = g_new0(ImageLoaderAreaParam, 1);
 427         par->il = il;
 428         par->x = x;
 429         par->y = y;
 430         par->w = w;
 431         par->h = h;
 432
 433         *list = g_list_prepend(*list, par);
 434         return par;
 435 }
 436
 437 /* this function expects that il->data_mutex is locked by caller */
 438 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 439 {
 440         ImageLoaderAreaParam *par = image_loader_queue_area_ready(il, &il->area_param_list, x, y, w, h);
 441
 442         if (par)
 443                 {
 444                 g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, nullptr);
 445                 }
 446 }
 447
 448 /**************************************************************************************/
 449 /* the following functions may be executed in separate thread */
 450
 451 /* this function expects that il->data_mutex is locked by caller */
 452 static void image_loader_queue_delayed_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 453 {
 454         image_loader_queue_area_ready(il, &il->area_param_delayed_list, x, y, w, h);
 455 }
 456
 457
 458
 459 static gboolean image_loader_get_stopping(ImageLoader *il)
 460 {
 461         gboolean ret;
 462         if (!il) return FALSE;
 463
 464         g_mutex_lock(il->data_mutex);
 465         ret = il->stopping;
 466         g_mutex_unlock(il->data_mutex);
 467
 468         return ret;
 469 }
 470
 471
 472 static void image_loader_sync_pixbuf(ImageLoader *il)
 473 {
 474         GdkPixbuf *pb;
 475
 476         g_mutex_lock(il->data_mutex);
 477
 478         if (!il->loader)
 479                 {
 480                 g_mutex_unlock(il->data_mutex);
 481                 return;
 482                 }
 483
 484         pb = il->backend.get_pixbuf(il->loader);
 485
 486         if (pb == il->pixbuf)
 487                 {
 488                 g_mutex_unlock(il->data_mutex);
 489                 return;
 490                 }
 491
 492         if (g_ascii_strcasecmp(".jps", il->fd->extension) == 0)
 493                 {
 494                 g_object_set_data(G_OBJECT(pb), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
 495                 }
 496
 497         if (il->pixbuf) g_object_unref(il->pixbuf);
 498
 499         il->pixbuf = pb;
 500         if (il->pixbuf) g_object_ref(il->pixbuf);
 501
 502         g_mutex_unlock(il->data_mutex);
 503 }
 504
 505 static void image_loader_area_updated_cb(gpointer,
 506                                  guint x, guint y, guint w, guint h,
 507                                  gpointer data)
 508 {
 509         auto il = static_cast<ImageLoader *>(data);
 510
 511         if (!image_loader_get_pixbuf(il))
 512                 {
 513                 image_loader_sync_pixbuf(il);
 514                 if (!image_loader_get_pixbuf(il))
 515                         {
 516                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 517                         }
 518                 }
 519
 520         g_mutex_lock(il->data_mutex);
 521         if (il->delay_area_ready)
 522                 image_loader_queue_delayed_area_ready(il, x, y, w, h);
 523         else
 524                 image_loader_emit_area_ready(il, x, y, w, h);
 525
 526         if (il->stopping) il->backend.abort(il->loader);
 527
 528         g_mutex_unlock(il->data_mutex);
 529 }
 530
 531 static void image_loader_area_prepared_cb(gpointer loader, gpointer data)
 532 {
 533         auto il = static_cast<ImageLoader *>(data);
 534         GdkPixbuf *pb;
 535         guchar *pix;
 536         size_t h;
 537         size_t rs;
 538
 539         /* a workaround for
 540            https://bugzilla.gnome.org/show_bug.cgi?id=547669
 541            https://bugzilla.gnome.org/show_bug.cgi?id=589334
 542         */
 543         gchar *format = il->backend.get_format_name(loader);
 544         if (strcmp(format, "svg") == 0 ||
 545             strcmp(format, "xpm") == 0)
 546                 {
 547                 g_free(format);
 548                 return;
 549                 }
 550
 551         g_free(format);
 552
 553         pb = il->backend.get_pixbuf(loader);
 554
 555         h = gdk_pixbuf_get_height(pb);
 556         rs = gdk_pixbuf_get_rowstride(pb);
 557         pix = gdk_pixbuf_get_pixels(pb);
 558
 559         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 560
 561 }
 562
 563 static void image_loader_size_cb(gpointer loader,
 564                                  gint width, gint height, gpointer data)
 565 {
 566         auto il = static_cast<ImageLoader *>(data);
 567         gchar **mime_types;
 568         gboolean scale = FALSE;
 569         gint n;
 570
 571         g_mutex_lock(il->data_mutex);
 572         il->actual_width = width;
 573         il->actual_height = height;
 574         if (il->requested_width < 1 || il->requested_height < 1)
 575                 {
 576                 g_mutex_unlock(il->data_mutex);
 577                 image_loader_emit_size(il);
 578                 return;
 579                 }
 580         g_mutex_unlock(il->data_mutex);
 581
 582 #if HAVE_FFMPEGTHUMBNAILER
 583         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 584                 scale = TRUE;
 585 #endif
 586         mime_types = il->backend.get_format_mime_types(loader);
 587         n = 0;
 588         while (mime_types[n] && !scale)
 589                 {
 590                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 591                 n++;
 592                 }
 593         g_strfreev(mime_types);
 594
 595         if (!scale)
 596                 {
 597                 image_loader_emit_size(il);
 598                 return;
 599                 }
 600
 601         g_mutex_lock(il->data_mutex);
 602
 603         gint nw;
 604         gint nh;
 605         if (width > il->requested_width || height > il->requested_height)
 606                 {
 607
 608                 if ((static_cast<gdouble>(il->requested_width) / width) < (static_cast<gdouble>(il->requested_height) / height))
 609                         {
 610                         nw = il->requested_width;
 611                         nh = static_cast<gdouble>(nw) / width * height;
 612                         if (nh < 1) nh = 1;
 613                         }
 614                 else
 615                         {
 616                         nh = il->requested_height;
 617                         nw = static_cast<gdouble>(nh) / height * width;
 618                         if (nw < 1) nw = 1;
 619                         }
 620
 621                 il->actual_width = nw;
 622                 il->actual_height = nh;
 623                 il->backend.set_size(loader, nw, nh);
 624                 il->shrunk = TRUE;
 625                 }
 626
 627         g_mutex_unlock(il->data_mutex);
 628         image_loader_emit_size(il);
 629 }
 630
 631 static void image_loader_stop_loader(ImageLoader *il)
 632 {
 633         if (!il) return;
 634
 635         if (il->loader)
 636                 {
 637                 /* some loaders do not have a pixbuf till close, order is important here */
 638                 il->backend.close(il->loader, il->error ? nullptr : &il->error); /* we are interested in the first error only */
 639                 image_loader_sync_pixbuf(il);
 640                 il->backend.free(il->loader);
 641                 il->loader = nullptr;
 642                 }
 643         g_mutex_lock(il->data_mutex);
 644         il->done = TRUE;
 645         g_mutex_unlock(il->data_mutex);
 646 }
 647
 648 static void image_loader_setup_loader(ImageLoader *il)
 649 {
 650 #if HAVE_TIFF || HAVE_PDF || HAVE_HEIF || HAVE_DJVU
 651         gchar *format;
 652 #endif
 653
 654         gint external_preview = 1;
 655
 656         g_mutex_lock(il->data_mutex);
 657
 658         if (options->external_preview.enable)
 659                 {
 660                 gchar *cmd_line;
 661                 gchar *tilde_filename;
 662
 663                 tilde_filename = expand_tilde(options->external_preview.select);
 664
 665                 cmd_line = g_strdup_printf("\"%s\" \"%s\"" , tilde_filename, il->fd->path);
 666
 667                 external_preview = runcmd(cmd_line);
 668                 g_free(cmd_line);
 669                 g_free(tilde_filename);
 670                 }
 671
 672         if (external_preview == 0)
 673                 {
 674                 DEBUG_1("Using custom external loader");
 675                 image_loader_backend_set_external(&il->backend);
 676                 }
 677         else
 678                 {
 679 #if HAVE_FFMPEGTHUMBNAILER
 680                 if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 681                         {
 682                         DEBUG_1("Using custom ffmpegthumbnailer loader");
 683                         image_loader_backend_set_ft(&il->backend);
 684                         }
 685                 else
 686 #endif
 687 #if HAVE_PDF
 688                 if (il->bytes_total >= 4 &&
 689                     (memcmp(il->mapped_file + 0, "%PDF", 4) == 0))
 690                         {
 691                         DEBUG_1("Using custom pdf loader");
 692                         image_loader_backend_set_pdf(&il->backend);
 693                         }
 694                 else
 695 #endif
 696 #if HAVE_HEIF
 697                 if (il->bytes_total >= 12 &&
 698                         ((memcmp(il->mapped_file + 4, "ftypheic", 8) == 0) ||
 699                         (memcmp(il->mapped_file + 4, "ftypheix", 8) == 0) ||
 700                         (memcmp(il->mapped_file + 4, "ftypmsf1", 8) == 0) ||
 701                         (memcmp(il->mapped_file + 4, "ftypmif1", 8) == 0) ||
 702                         (memcmp(il->mapped_file + 4, "ftypavif", 8) == 0)))
 703                         {
 704                         DEBUG_1("Using custom heif loader");
 705                         image_loader_backend_set_heif(&il->backend);
 706                         }
 707                 else
 708         #endif
 709         #if HAVE_WEBP
 710                 if (il->bytes_total >= 12 &&
 711                         (memcmp(il->mapped_file, "RIFF", 4) == 0) &&
 712                         (memcmp(il->mapped_file + 8, "WEBP", 4) == 0))
 713                         {
 714                         DEBUG_1("Using custom webp loader");
 715                         image_loader_backend_set_webp(&il->backend);
 716                         }
 717                 else
 718 #endif
 719 #if HAVE_DJVU
 720                 if (il->bytes_total >= 16 &&
 721                         (memcmp(il->mapped_file, "AT&TFORM", 8) == 0) &&
 722                         (memcmp(il->mapped_file + 12, "DJV", 3) == 0))
 723                         {
 724                         DEBUG_1("Using custom djvu loader");
 725                         image_loader_backend_set_djvu(&il->backend);
 726                         }
 727                 else
 728 #endif
 729 #if HAVE_JPEG
 730                 if (il->bytes_total >= 2 && il->mapped_file[0] == 0xff && il->mapped_file[1] == 0xd8)
 731                         {
 732                         DEBUG_1("Using custom jpeg loader");
 733                         image_loader_backend_set_jpeg(&il->backend);
 734                         }
 735 #if !HAVE_RAW
 736                 else
 737                 if (il->bytes_total >= 11 &&
 738                         (memcmp(il->mapped_file + 4, "ftypcrx", 7) == 0) &&
 739                         (memcmp(il->mapped_file + 64, "CanonCR3", 8) == 0))
 740                         {
 741                         DEBUG_1("Using custom cr3 loader");
 742                         image_loader_backend_set_cr3(&il->backend);
 743                         }
 744 #endif
 745                 else
 746 #endif
 747 #if HAVE_TIFF
 748                 if (il->bytes_total >= 10 &&
 749                     (memcmp(il->mapped_file, "MM\0*", 4) == 0 ||
 750                      memcmp(il->mapped_file, "MM\0+\0\x08\0\0", 8) == 0 ||
 751                      memcmp(il->mapped_file, "II+\0\x08\0\0\0", 8) == 0 ||
 752                      memcmp(il->mapped_file, "II*\0", 4) == 0))
 753                         {
 754                         DEBUG_1("Using custom tiff loader");
 755                         image_loader_backend_set_tiff(&il->backend);
 756                         }
 757                 else
 758 #endif
 759                 if (il->bytes_total >= 3 && il->mapped_file[0] == 0x44 && il->mapped_file[1] == 0x44 && il->mapped_file[2] == 0x53)
 760                         {
 761                         DEBUG_1("Using dds loader");
 762                         image_loader_backend_set_dds(&il->backend);
 763                         }
 764                 else
 765                 if (il->bytes_total >= 6 &&
 766                         (memcmp(il->mapped_file, "8BPS\0\x01", 6) == 0))
 767                         {
 768                         DEBUG_1("Using custom psd loader");
 769                         image_loader_backend_set_psd(&il->backend);
 770                         }
 771                 else
 772 #if HAVE_J2K
 773                 if (il->bytes_total >= 12 &&
 774                         (memcmp(il->mapped_file, "\0\0\0\x0CjP\x20\x20\x0D\x0A\x87\x0A", 12) == 0))
 775                         {
 776                         DEBUG_1("Using custom j2k loader");
 777                         image_loader_backend_set_j2k(&il->backend);
 778                         }
 779                 else
 780 #endif
 781 #if HAVE_JPEGXL
 782                 if (il->bytes_total >= 12 &&
 783                         (memcmp(il->mapped_file, "\0\0\0\x0C\x4A\x58\x4C\x20\x0D\x0A\x87\x0A", 12) == 0))
 784                         {
 785                         DEBUG_1("Using custom jpeg xl loader");
 786                         image_loader_backend_set_jpegxl(&il->backend);
 787                         }
 788                 else
 789                 if (il->bytes_total >= 2 &&
 790                         (memcmp(il->mapped_file, "\xFF\x0A", 2) == 0))
 791                         {
 792                         DEBUG_1("Using custom jpeg xl loader");
 793                         image_loader_backend_set_jpegxl(&il->backend);
 794                         }
 795                 else
 796 #endif
 797                 if ((il->bytes_total == 6144 || il->bytes_total == 6912) &&
 798                         (file_extension_match(il->fd->path, ".scr")))
 799                         {
 800                         DEBUG_1("Using custom zxscr loader");
 801                         image_loader_backend_set_zxscr(&il->backend);
 802                         }
 803                 else
 804                 if (il->fd->format_class == FORMAT_CLASS_COLLECTION)
 805                         {
 806                         DEBUG_1("Using custom collection loader");
 807                         image_loader_backend_set_collection(&il->backend);
 808                         }
 809                 else
 810                 if (g_strcmp0(strrchr(il->fd->path, '.'), ".svgz") == 0)
 811                         {
 812                         DEBUG_1("Using custom svgz loader");
 813                         image_loader_backend_set_svgz(&il->backend);
 814                         }
 815                 else
 816                         image_loader_backend_set_default(&il->backend);
 817                 }
 818
 819         il->loader = static_cast<void **>(il->backend.loader_new(image_loader_area_updated_cb, image_loader_size_cb, image_loader_area_prepared_cb, il));
 820
 821 #if HAVE_TIFF
 822         format = il->backend.get_format_name(il->loader);
 823         if (g_strcmp0(format, "tiff") == 0)
 824                 {
 825                 il->backend.set_page_num(il->loader, il->fd->page_num);
 826                 }
 827         g_free(format);
 828 #endif
 829
 830 #if HAVE_PDF
 831         format = il->backend.get_format_name(il->loader);
 832         if (g_strcmp0(format, "pdf") == 0)
 833                 {
 834                 il->backend.set_page_num(il->loader, il->fd->page_num);
 835                 }
 836         g_free(format);
 837 #endif
 838
 839 #if HAVE_HEIF
 840         format = il->backend.get_format_name(il->loader);
 841         if (g_strcmp0(format, "heif") == 0)
 842                 {
 843                 il->backend.set_page_num(il->loader, il->fd->page_num);
 844                 }
 845         g_free(format);
 846 #endif
 847
 848 #if HAVE_DJVU
 849         format = il->backend.get_format_name(il->loader);
 850         if (g_strcmp0(format, "djvu") == 0)
 851                 {
 852                 il->backend.set_page_num(il->loader, il->fd->page_num);
 853                 }
 854         g_free(format);
 855 #endif
 856
 857         il->fd->format_name = il->backend.get_format_name(il->loader);
 858
 859         g_mutex_unlock(il->data_mutex);
 860 }
 861
 862
 863 static void image_loader_done(ImageLoader *il)
 864 {
 865         image_loader_stop_loader(il);
 866
 867         image_loader_emit_done(il);
 868 }
 869
 870 static void image_loader_error(ImageLoader *il)
 871 {
 872         image_loader_stop_loader(il);
 873
 874         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 875
 876         image_loader_emit_error(il);
 877 }
 878
 879 static gboolean image_loader_continue(ImageLoader *il)
 880 {
 881         gint c;
 882
 883         if (!il) return G_SOURCE_REMOVE;
 884
 885         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 886         while (c > 0 && !image_loader_get_stopping(il))
 887                 {
 888                 if (il->bytes_total == il->bytes_read)
 889                         {
 890                         image_loader_done(il);
 891                         return G_SOURCE_REMOVE;
 892                         }
 893
 894                 if (il->bytes_total < il->bytes_read)
 895                         {
 896                         image_loader_error(il);
 897                         return G_SOURCE_REMOVE;
 898                         }
 899
 900                 gsize b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 901
 902                 if (!il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, il->bytes_total, &il->error))
 903                         {
 904                         image_loader_error(il);
 905                         return G_SOURCE_REMOVE;
 906                         }
 907
 908                 il->bytes_read += b;
 909
 910                 c--;
 911                 }
 912
 913         if (il->bytes_total > 0)
 914                 {
 915                 image_loader_emit_percent(il);
 916                 }
 917
 918         return G_SOURCE_CONTINUE;
 919 }
 920
 921 static gboolean image_loader_begin(ImageLoader *il)
 922 {
 923 #if HAVE_TIFF || HAVE_PDF || HAVE_HEIF || HAVE_DJVU
 924         gchar *format;
 925 #endif
 926
 927         if (il->pixbuf) return FALSE;
 928
 929         if (il->bytes_total <= il->bytes_read) return FALSE;
 930
 931         gsize b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 932
 933         image_loader_setup_loader(il);
 934
 935         g_assert(il->bytes_read == 0);
 936         if (!il->backend.write(il->loader, il->mapped_file, b, il->bytes_total, &il->error))
 937                 {
 938                 image_loader_stop_loader(il);
 939                 return FALSE;
 940                 }
 941
 942 #if HAVE_PDF
 943         format = il->backend.get_format_name(il->loader);
 944         if (g_strcmp0(format, "pdf") == 0)
 945                 {
 946                 gint i = il->backend.get_page_total(il->loader);
 947                 file_data_set_page_total(il->fd, i);
 948                 }
 949         g_free(format);
 950 #endif
 951 #if HAVE_HEIF
 952         format = il->backend.get_format_name(il->loader);
 953         if (g_strcmp0(format, "heif") == 0)
 954                 {
 955                 gint i = il->backend.get_page_total(il->loader);
 956                 file_data_set_page_total(il->fd, i);
 957                 }
 958         g_free(format);
 959 #endif
 960 #if HAVE_DJVU
 961         format = il->backend.get_format_name(il->loader);
 962         if (g_strcmp0(format, "djvu") == 0)
 963                 {
 964                 gint i = il->backend.get_page_total(il->loader);
 965                 file_data_set_page_total(il->fd, i);
 966                 }
 967         g_free(format);
 968 #endif
 969 #if HAVE_TIFF
 970         format = il->backend.get_format_name(il->loader);
 971         if (g_strcmp0(format, "tiff") == 0)
 972                 {
 973                 gint i = il->backend.get_page_total(il->loader);
 974                 file_data_set_page_total(il->fd, i);
 975                 }
 976         g_free(format);
 977 #endif
 978
 979         il->bytes_read += b;
 980
 981         /* read until size is known */
 982         while (il->loader && !il->backend.get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 983                 {
 984                 if (il->bytes_total < il->bytes_read)
 985                         {
 986                         image_loader_stop_loader(il);
 987                         return FALSE;
 988                         }
 989
 990                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 991                 if (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, il->bytes_total, &il->error))
 992                         {
 993                         image_loader_stop_loader(il);
 994                         return FALSE;
 995                         }
 996                 il->bytes_read += b;
 997                 }
 998         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 999
1000         if (il->bytes_read == il->bytes_total || b < 1)
1001                 {
1002                 /* done, handle (broken) loaders that do not have pixbuf till close */
1003                 image_loader_stop_loader(il);
1004
1005                 if (!il->pixbuf) return FALSE;
1006
1007                 image_loader_done(il);
1008                 return TRUE;
1009                 }
1010
1011         if (!il->pixbuf)
1012                 {
1013                 image_loader_stop_loader(il);
1014                 return FALSE;
1015                 }
1016
1017         return TRUE;
1018 }
1019
1020 /**************************************************************************************/
1021 /* the following functions are always executed in the main thread */
1022
1023
1024 static gboolean image_loader_setup_source(ImageLoader *il)
1025 {
1026         struct stat st;
1027         gchar *pathl;
1028
1029         if (!il || il->loader || il->mapped_file) return FALSE;
1030
1031         il->mapped_file = nullptr;
1032
1033         if (il->fd)
1034                 {
1035                 ExifData *exif = exif_read_fd(il->fd);
1036
1037                 if (options->thumbnails.use_exif)
1038                         {
1039                         il->mapped_file = exif_get_preview(exif, reinterpret_cast<guint *>(&il->bytes_total), il->requested_width, il->requested_height);
1040
1041                         if (il->mapped_file)
1042                                 {
1043                                 il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1044                                 }
1045                         }
1046                 else
1047                         {
1048                         il->mapped_file = libraw_get_preview(il, reinterpret_cast<guint *>(&il->bytes_total));
1049
1050                         if (il->mapped_file)
1051                                 {
1052                                 /* Both exiv2 and libraw sometimes return a pointer to a file
1053                                  * section that is not a jpeg */
1054                                 if (il->mapped_file[0] != 0xFF || il->mapped_file[1] != 0xD8)
1055                                         {
1056                                         il->mapped_file = nullptr;
1057                                         }
1058                                 else
1059                                         {
1060                                         il->preview = IMAGE_LOADER_PREVIEW_LIBRAW;
1061                                         }
1062                                 }
1063                         }
1064
1065                 /* If libraw does not find a thumbnail, try exiv2 */
1066                 if (!il->mapped_file)
1067                         {
1068                         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*/
1069
1070                         if (il->mapped_file)
1071                                 {
1072                                 /* Both exiv2 and libraw sometimes return a pointer to a file
1073                                  * section that is not a jpeg */
1074                                 if (il->mapped_file[0] != 0xFF || il->mapped_file[1] != 0xD8)
1075                                         {
1076                                         il->mapped_file = nullptr;
1077                                         }
1078                                 else
1079                                         {
1080                                         il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1081                                         }
1082                                 }
1083                         }
1084
1085                 if (il->mapped_file)
1086                         {
1087                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
1088                         }
1089                 exif_free_fd(il->fd, exif);
1090                 }
1091
1092
1093         if (!il->mapped_file)
1094                 {
1095                 /* normal file */
1096                 gint load_fd;
1097
1098                 pathl = path_from_utf8(il->fd->path);
1099                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
1100                 g_free(pathl);
1101                 if (load_fd == -1) return FALSE;
1102
1103                 if (fstat(load_fd, &st) == 0)
1104                         {
1105                         il->bytes_total = st.st_size;
1106                         }
1107                 else
1108                         {
1109                         close(load_fd);
1110                         return FALSE;
1111                         }
1112
1113                 il->mapped_file = static_cast<guchar *>(mmap(nullptr, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0));
1114                 close(load_fd);
1115                 if (il->mapped_file == MAP_FAILED)
1116                         {
1117                         il->mapped_file = nullptr;
1118                         return FALSE;
1119                         }
1120                 il->preview = IMAGE_LOADER_PREVIEW_NONE;
1121                 }
1122
1123         return TRUE;
1124 }
1125
1126 static void image_loader_stop_source(ImageLoader *il)
1127 {
1128         if (!il) return;
1129
1130         if (il->mapped_file)
1131                 {
1132                 if (il->preview == IMAGE_LOADER_PREVIEW_EXIF)
1133                         {
1134                         exif_free_preview(il->mapped_file);
1135                         }
1136                 else if (il->preview == IMAGE_LOADER_PREVIEW_LIBRAW)
1137                         {
1138                         libraw_free_preview(il->mapped_file);
1139                         }
1140                 else
1141                         {
1142                         munmap(il->mapped_file, il->bytes_total);
1143                         }
1144                 il->mapped_file = nullptr;
1145                 }
1146 }
1147
1148 static void image_loader_stop(ImageLoader *il)
1149 {
1150         if (!il) return;
1151
1152         if (il->idle_id)
1153                 {
1154                 g_source_remove(il->idle_id);
1155                 il->idle_id = 0;
1156                 }
1157
1158         if (il->thread)
1159                 {
1160                 /* stop loader in the other thread */
1161                 g_mutex_lock(il->data_mutex);
1162                 il->stopping = TRUE;
1163                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
1164                 g_mutex_unlock(il->data_mutex);
1165                 }
1166
1167         image_loader_stop_loader(il);
1168         image_loader_stop_source(il);
1169
1170 }
1171
1172 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
1173 {
1174         g_mutex_lock(il->data_mutex);
1175         il->delay_area_ready = enable;
1176         if (!enable)
1177                 {
1178                 /* send delayed */
1179                 GList *list;
1180                 GList *work;
1181                 list = g_list_reverse(il->area_param_delayed_list);
1182                 il->area_param_delayed_list = nullptr;
1183                 g_mutex_unlock(il->data_mutex);
1184
1185                 work = list;
1186
1187                 while (work)
1188                         {
1189                         auto par = static_cast<ImageLoaderAreaParam *>(work->data);
1190                         work = work->next;
1191
1192                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
1193                         }
1194                 g_list_free_full(list, g_free);
1195                 }
1196         else
1197                 {
1198                 /* just unlock */
1199                 g_mutex_unlock(il->data_mutex);
1200                 }
1201 }
1202
1203
1204 /**************************************************************************************/
1205 /* execution via idle calls */
1206
1207 static gboolean image_loader_idle_cb(gpointer data)
1208 {
1209         gboolean ret = G_SOURCE_REMOVE;
1210         auto il = static_cast<ImageLoader *>(data);
1211
1212         if (il->idle_id)
1213                 {
1214                 ret = image_loader_continue(il);
1215                 }
1216
1217         if (!ret)
1218                 {
1219                 image_loader_stop_source(il);
1220                 }
1221
1222         return ret;
1223 }
1224
1225 static gboolean image_loader_start_idle(ImageLoader *il)
1226 {
1227         gboolean ret;
1228
1229         if (!il) return FALSE;
1230
1231         if (!il->fd) return FALSE;
1232
1233         if (!image_loader_setup_source(il)) return FALSE;
1234
1235         ret = image_loader_begin(il);
1236
1237         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, nullptr);
1238         return ret;
1239 }
1240
1241 /**************************************************************************************/
1242 /* execution via thread */
1243
1244 static GThreadPool *image_loader_thread_pool = nullptr;
1245
1246 static GCond *image_loader_prio_cond = nullptr;
1247 static GMutex *image_loader_prio_mutex = nullptr;
1248 static gint image_loader_prio_num = 0;
1249
1250
1251 static void image_loader_thread_enter_high()
1252 {
1253         g_mutex_lock(image_loader_prio_mutex);
1254         image_loader_prio_num++;
1255         g_mutex_unlock(image_loader_prio_mutex);
1256 }
1257
1258 static void image_loader_thread_leave_high()
1259 {
1260         g_mutex_lock(image_loader_prio_mutex);
1261         image_loader_prio_num--;
1262         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
1263         g_mutex_unlock(image_loader_prio_mutex);
1264 }
1265
1266 static void image_loader_thread_wait_high()
1267 {
1268         g_mutex_lock(image_loader_prio_mutex);
1269         while (image_loader_prio_num)
1270                 {
1271                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
1272                 }
1273
1274         g_mutex_unlock(image_loader_prio_mutex);
1275 }
1276
1277
1278 static void image_loader_thread_run(gpointer data, gpointer)
1279 {
1280         auto il = static_cast<ImageLoader *>(data);
1281         gboolean cont;
1282         gboolean err;
1283
1284         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1285                 {
1286                 /* low prio, wait until high prio tasks finishes */
1287                 image_loader_thread_wait_high();
1288                 }
1289         else
1290                 {
1291                 /* high prio */
1292                 image_loader_thread_enter_high();
1293                 }
1294
1295         err = !image_loader_begin(il);
1296
1297         if (err)
1298                 {
1299                 /*
1300                 loader failed, we have to send signal
1301                 (idle mode returns the image_loader_begin return value directly)
1302                 (success is always reported indirectly from image_loader_begin)
1303                 */
1304                 image_loader_emit_error(il);
1305                 }
1306
1307         cont = !err;
1308
1309         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
1310                 {
1311                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1312                         {
1313                         /* low prio, wait until high prio tasks finishes */
1314                         image_loader_thread_wait_high();
1315                         }
1316                 cont = image_loader_continue(il);
1317                 }
1318         image_loader_stop_loader(il);
1319
1320         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
1321                 {
1322                 /* high prio */
1323                 image_loader_thread_leave_high();
1324                 }
1325
1326         g_mutex_lock(il->data_mutex);
1327         il->can_destroy = TRUE;
1328         g_cond_signal(il->can_destroy_cond);
1329         g_mutex_unlock(il->data_mutex);
1330
1331 }
1332
1333
1334 static gboolean image_loader_start_thread(ImageLoader *il)
1335 {
1336         if (!il) return FALSE;
1337
1338         if (!il->fd) return FALSE;
1339
1340         il->thread = TRUE;
1341
1342         if (!image_loader_setup_source(il)) return FALSE;
1343
1344         if (!image_loader_thread_pool)
1345                 {
1346                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, nullptr, -1, FALSE, nullptr);
1347                 if (!image_loader_prio_cond) image_loader_prio_cond = g_new(GCond, 1);
1348                 g_cond_init(image_loader_prio_cond);
1349                 if (!image_loader_prio_mutex) image_loader_prio_mutex = g_new(GMutex, 1);
1350                 g_mutex_init(image_loader_prio_mutex);
1351                 }
1352
1353         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
1354
1355         g_thread_pool_push(image_loader_thread_pool, il, nullptr);
1356         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
1357
1358         return TRUE;
1359 }
1360
1361
1362 /**************************************************************************************/
1363 /* public interface */
1364
1365
1366 gboolean image_loader_start(ImageLoader *il)
1367 {
1368         if (!il) return FALSE;
1369
1370         if (!il->fd) return FALSE;
1371
1372         return image_loader_start_thread(il);
1373 }
1374
1375
1376 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
1377 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
1378 {
1379         GdkPixbuf *ret;
1380         if (!il) return nullptr;
1381
1382         g_mutex_lock(il->data_mutex);
1383         ret = il->pixbuf;
1384         g_mutex_unlock(il->data_mutex);
1385         return ret;
1386 }
1387
1388 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
1389 {
1390         if (!il) return;
1391
1392         g_mutex_lock(il->data_mutex);
1393         il->requested_width = width;
1394         il->requested_height = height;
1395         g_mutex_unlock(il->data_mutex);
1396 }
1397
1398 void image_loader_set_buffer_size(ImageLoader *il, guint count)
1399 {
1400         if (!il) return;
1401
1402         g_mutex_lock(il->data_mutex);
1403         il->idle_read_loop_count = count ? count : 1;
1404         g_mutex_unlock(il->data_mutex);
1405 }
1406
1407 void image_loader_set_priority(ImageLoader *il, gint priority)
1408 {
1409         if (!il) return;
1410
1411         if (il->thread) return; /* can't change prio if the thread already runs */
1412         il->idle_priority = priority;
1413 }
1414
1415
1416 gdouble image_loader_get_percent(ImageLoader *il)
1417 {
1418         gdouble ret;
1419         if (!il) return 0.0;
1420
1421         g_mutex_lock(il->data_mutex);
1422         if (il->bytes_total == 0)
1423                 {
1424                 ret = 0.0;
1425                 }
1426         else
1427                 {
1428                 ret = static_cast<gdouble>(il->bytes_read) / il->bytes_total;
1429                 }
1430         g_mutex_unlock(il->data_mutex);
1431         return ret;
1432 }
1433
1434 gboolean image_loader_get_is_done(ImageLoader *il)
1435 {
1436         gboolean ret;
1437         if (!il) return FALSE;
1438
1439         g_mutex_lock(il->data_mutex);
1440         ret = il->done;
1441         g_mutex_unlock(il->data_mutex);
1442
1443         return ret;
1444 }
1445
1446 FileData *image_loader_get_fd(ImageLoader *il)
1447 {
1448         FileData *ret;
1449         if (!il) return nullptr;
1450
1451         g_mutex_lock(il->data_mutex);
1452         ret = il->fd;
1453         g_mutex_unlock(il->data_mutex);
1454
1455         return ret;
1456 }
1457
1458 gboolean image_loader_get_shrunk(ImageLoader *il)
1459 {
1460         gboolean ret;
1461         if (!il) return FALSE;
1462
1463         g_mutex_lock(il->data_mutex);
1464         ret = il->shrunk;
1465         g_mutex_unlock(il->data_mutex);
1466         return ret;
1467 }
1468
1469 const gchar *image_loader_get_error(ImageLoader *il)
1470 {
1471         const gchar *ret = nullptr;
1472         if (!il) return nullptr;
1473         g_mutex_lock(il->data_mutex);
1474         if (il->error) ret = il->error->message;
1475         g_mutex_unlock(il->data_mutex);
1476         return ret;
1477 }
1478
1479
1480 /**
1481  *  @FIXME this can be rather slow and blocks until the size is known
1482  */
1483 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1484 {
1485         ImageLoader *il;
1486         gboolean success;
1487
1488         il = image_loader_new(fd);
1489
1490         success = image_loader_start_idle(il);
1491
1492         if (success && il->pixbuf)
1493                 {
1494                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1495                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1496                 }
1497         else
1498                 {
1499                 if (width) *width = -1;
1500                 if (height) *height = -1;
1501                 }
1502
1503         image_loader_free(il);
1504
1505         return success;
1506 }
1507 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */