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