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