src/image-load.c

   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 #include "image_load_cr3.h"
  25 #include "image_load_gdk.h"
  26 #include "image_load_jpeg.h"
  27 #include "image_load_tiff.h"
  28 #include "image_load_dds.h"
  29 #include "image_load_djvu.h"
  30 #include "image_load_external.h"
  31 #include "image_load_pdf.h"
  32 #include "image_load_psd.h"
  33 #include "image_load_heif.h"
  34 #include "image_load_ffmpegthumbnailer.h"
  35 #include "image_load_collection.h"
  36 #include "image_load_webp.h"
  37 #include "image_load_j2k.h"
  38 #include "image_load_jpegxl.h"
  39 #include "image_load_libraw.h"
  40 #include "image_load_svgz.h"
  41 #include "misc.h"
  42
  43 #include "exif.h"
  44 #include "filedata.h"
  45 #include "ui_fileops.h"
  46 #include "gq-marshal.h"
  47
  48 #include <fcntl.h>
  49 #include <sys/mman.h>
  50
  51 #define IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT   4096
  52 #define IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT       1
  53
  54 /**
  55  * @page diagrams Diagrams
  56  * @section image_load_overview Image Load Overview
  57  * @startuml
  58  * object image_change
  59  * object image_change_complete
  60  * object image_load_begin
  61  * object image_loader_start
  62  * object image_loader_start_thread
  63  * object image_loader_start_idle
  64  * object image_loader_setup_source
  65  * object image_loader_thread_run
  66  * object image_loader_begin
  67  * object image_loader_setuploader
  68  * circle "il->memory_mapped"
  69  * object exif_get_preview_
  70  * object exif_get_preview
  71  * object libraw_get_preview
  72  *
  73  * image_change : image.c
  74  * image_change_complete : image.c
  75  * image_load_begin : image.c
  76  * image_loader_start : image_load.c
  77  * image_loader_start_thread : image_load.c
  78  * image_loader_start_idle : image_load.c
  79  * image_loader_thread_run : image_load.c
  80  * image_loader_begin : image_load.c
  81  * image_loader_setuploader : image_load.c
  82  * image_loader_setuploader : -
  83  * image_loader_setuploader : Select backend using magic
  84  * image_loader_setup_source : image_load.c
  85  * exif_get_preview : exiv2.cc
  86  * exif_get_preview : EXIV2_TEST_VERSION(0,17,90)
  87  * exif_get_preview_ : exif.c
  88  * exif_get_preview_ : -
  89  * exif_get_preview_ : If exiv2 not installed
  90  * libraw_get_preview : image_load_libraw.c
  91  *
  92  * image_change --> image_change_complete
  93  * image_change_complete --> image_load_begin
  94  * image_load_begin --> image_loader_start
  95  * image_loader_start --> image_loader_start_thread
  96  * image_loader_start --> image_loader_start_idle : Obsolete - no threads version
  97  * image_loader_start_thread --> image_loader_thread_run
  98  * image_loader_start_thread --> image_loader_setup_source
  99  * image_loader_setup_source --> exif_get_preview_
 100  * image_loader_setup_source --> exif_get_preview
 101  * image_loader_setup_source --> libraw_get_preview : Try libraw if exiv2 fails
 102  * exif_get_preview_ ..> "il->memory_mapped"
 103  * exif_get_preview ..> "il->memory_mapped"
 104  * libraw_get_preview ..> "il->memory_mapped"
 105  * image_loader_thread_run --> image_loader_begin
 106  * image_loader_begin --> image_loader_setuploader
 107  * "il->memory_mapped" ..> image_loader_setuploader
 108  * note left of "il->memory_mapped" : Points to first byte of embedded jpeg (#FFD8)\n if preview found, otherwise to first byte of file
 109  * @enduml
 110  */
 111  /**
 112   * @file
 113   * @ref image_load_overview "Image Load Overview"
 114   */
 115
 116 /**************************************************************************************/
 117 /* image loader class */
 118
 119
 120 enum {
 121         SIGNAL_AREA_READY = 0,
 122         SIGNAL_ERROR,
 123         SIGNAL_DONE,
 124         SIGNAL_PERCENT,
 125         SIGNAL_SIZE,
 126         SIGNAL_COUNT
 127 };
 128
 129 static guint signals[SIGNAL_COUNT] = { 0 };
 130
 131 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
 132 static void image_loader_class_init_wrapper(void *data, void *user_data);
 133 static void image_loader_class_init(ImageLoaderClass *class);
 134 static void image_loader_finalize(GObject *object);
 135 static void image_loader_stop(ImageLoader *il);
 136
 137 GType image_loader_get_type(void)
 138 {
 139         static GType type = 0;
 140         if (type == 0)
 141                 {
 142                 static const GTypeInfo info = {
 143                         sizeof(ImageLoaderClass),
 144                         NULL,   /* base_init */
 145                         NULL,   /* base_finalize */
 146                         (GClassInitFunc)image_loader_class_init_wrapper, /* class_init */
 147                         NULL,   /* class_finalize */
 148                         NULL,   /* class_data */
 149                         sizeof(ImageLoader),
 150                         0,      /* n_preallocs */
 151                         (GInstanceInitFunc)image_loader_init, /* instance_init */
 152                         NULL    /* value_table */
 153                         };
 154                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
 155                 }
 156         return type;
 157 }
 158
 159 static void image_loader_init(GTypeInstance *instance, gpointer g_class)
 160 {
 161         ImageLoader *il = (ImageLoader *)instance;
 162
 163         il->pixbuf = NULL;
 164         il->idle_id = 0;
 165         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
 166         il->done = FALSE;
 167         il->loader = NULL;
 168
 169         il->bytes_read = 0;
 170         il->bytes_total = 0;
 171
 172         il->idle_done_id = 0;
 173
 174         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
 175         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
 176         il->mapped_file = NULL;
 177         il->preview = IMAGE_LOADER_PREVIEW_NONE;
 178
 179         il->requested_width = 0;
 180         il->requested_height = 0;
 181         il->actual_width = 0;
 182         il->actual_height = 0;
 183         il->shrunk = FALSE;
 184
 185         il->can_destroy = TRUE;
 186
 187 #ifdef HAVE_GTHREAD
 188 #if GLIB_CHECK_VERSION(2,32,0)
 189         il->data_mutex = g_new(GMutex, 1);
 190         g_mutex_init(il->data_mutex);
 191         il->can_destroy_cond = g_new(GCond, 1);
 192         g_cond_init(il->can_destroy_cond);
 193 #else
 194         il->data_mutex = g_mutex_new();
 195         il->can_destroy_cond = g_cond_new();
 196 #endif
 197 #endif
 198         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
 199 }
 200
 201 static void image_loader_class_init_wrapper(void *data, void *user_data)
 202 {
 203         image_loader_class_init(data);
 204 }
 205
 206 static void image_loader_class_init(ImageLoaderClass *class)
 207 {
 208         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 209
 210 //      gobject_class->set_property = image_loader_set_property;
 211 //      gobject_class->get_property = image_loader_get_property;
 212
 213         gobject_class->finalize = image_loader_finalize;
 214
 215
 216         signals[SIGNAL_AREA_READY] =
 217                 g_signal_new("area_ready",
 218                              G_OBJECT_CLASS_TYPE(gobject_class),
 219                              G_SIGNAL_RUN_LAST,
 220                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 221                              NULL, NULL,
 222                              gq_marshal_VOID__INT_INT_INT_INT,
 223                              G_TYPE_NONE, 4,
 224                              G_TYPE_INT,
 225                              G_TYPE_INT,
 226                              G_TYPE_INT,
 227                              G_TYPE_INT);
 228
 229         signals[SIGNAL_ERROR] =
 230                 g_signal_new("error",
 231                              G_OBJECT_CLASS_TYPE(gobject_class),
 232                              G_SIGNAL_RUN_LAST,
 233                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 234                              NULL, NULL,
 235                              g_cclosure_marshal_VOID__VOID,
 236                              G_TYPE_NONE, 0);
 237
 238         signals[SIGNAL_DONE] =
 239                 g_signal_new("done",
 240                              G_OBJECT_CLASS_TYPE(gobject_class),
 241                              G_SIGNAL_RUN_LAST,
 242                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 243                              NULL, NULL,
 244                              g_cclosure_marshal_VOID__VOID,
 245                              G_TYPE_NONE, 0);
 246
 247         signals[SIGNAL_PERCENT] =
 248                 g_signal_new("percent",
 249                              G_OBJECT_CLASS_TYPE(gobject_class),
 250                              G_SIGNAL_RUN_LAST,
 251                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 252                              NULL, NULL,
 253                              g_cclosure_marshal_VOID__DOUBLE,
 254                              G_TYPE_NONE, 1,
 255                              G_TYPE_DOUBLE);
 256
 257         signals[SIGNAL_SIZE] =
 258                 g_signal_new("size_prepared",
 259                              G_OBJECT_CLASS_TYPE(gobject_class),
 260                              G_SIGNAL_RUN_LAST,
 261                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 262                              NULL, NULL,
 263                              gq_marshal_VOID__INT_INT,
 264                              G_TYPE_NONE, 2,
 265                              G_TYPE_INT,
 266                              G_TYPE_INT);
 267
 268 }
 269
 270 static void image_loader_finalize(GObject *object)
 271 {
 272         ImageLoader *il = (ImageLoader *)object;
 273
 274         image_loader_stop(il);
 275
 276         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 277
 278         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, il, il->bytes_read);
 279
 280         if (il->idle_done_id)
 281                 {
 282                 g_source_remove(il->idle_done_id);
 283                 il->idle_done_id = 0;
 284                 }
 285
 286         while (g_source_remove_by_user_data(il))
 287                 {
 288                 DEBUG_2("pending signals detected");
 289                 }
 290
 291         while (il->area_param_list)
 292                 {
 293                 DEBUG_1("pending area_ready signals detected");
 294                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 295                 g_free(il->area_param_list->data);
 296                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 297                 }
 298
 299         while (il->area_param_delayed_list)
 300                 {
 301                 g_free(il->area_param_delayed_list->data);
 302                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 303                 }
 304
 305         if (il->pixbuf) g_object_unref(il->pixbuf);
 306
 307         if (il->error) g_error_free(il->error);
 308
 309         file_data_unref(il->fd);
 310 #ifdef HAVE_GTHREAD
 311 #if GLIB_CHECK_VERSION(2,32,0)
 312         g_mutex_clear(il->data_mutex);
 313         g_free(il->data_mutex);
 314         g_cond_clear(il->can_destroy_cond);
 315         g_free(il->can_destroy_cond);
 316 #else
 317         g_mutex_free(il->data_mutex);
 318         g_cond_free(il->can_destroy_cond);
 319 #endif
 320 #endif
 321 }
 322
 323 void image_loader_free(ImageLoader *il)
 324 {
 325         if (!il) return;
 326         g_object_unref(G_OBJECT(il));
 327 }
 328
 329
 330 ImageLoader *image_loader_new(FileData *fd)
 331 {
 332         ImageLoader *il;
 333
 334         if (!fd) return NULL;
 335
 336         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 337
 338         il->fd = file_data_ref(fd);
 339
 340         return il;
 341 }
 342
 343 /**************************************************************************************/
 344 /* send signals via idle calbacks - the callback are executed in the main thread */
 345
 346 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 347 struct _ImageLoaderAreaParam {
 348         ImageLoader *il;
 349         guint x;
 350         guint y;
 351         guint w;
 352         guint h;
 353 };
 354
 355
 356 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 357 {
 358         ImageLoaderAreaParam *par = data;
 359         ImageLoader *il = par->il;
 360         guint x, y, w, h;
 361         g_mutex_lock(il->data_mutex);
 362         il->area_param_list = g_list_remove(il->area_param_list, par);
 363         x = par->x;
 364         y = par->y;
 365         w = par->w;
 366         h = par->h;
 367         g_free(par);
 368         g_mutex_unlock(il->data_mutex);
 369
 370         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, x, y, w, h);
 371
 372         return FALSE;
 373 }
 374
 375 static gboolean image_loader_emit_done_cb(gpointer data)
 376 {
 377         ImageLoader *il = data;
 378         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 379         return FALSE;
 380 }
 381
 382 static gboolean image_loader_emit_error_cb(gpointer data)
 383 {
 384         ImageLoader *il = data;
 385         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 386         return FALSE;
 387 }
 388
 389 static gboolean image_loader_emit_percent_cb(gpointer data)
 390 {
 391         ImageLoader *il = data;
 392         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 393         return FALSE;
 394 }
 395
 396 static gboolean image_loader_emit_size_cb(gpointer data)
 397 {
 398         gint width, height;
 399         ImageLoader *il = data;
 400         g_mutex_lock(il->data_mutex);
 401         width = il->actual_width;
 402         height = il->actual_height;
 403         g_mutex_unlock(il->data_mutex);
 404         g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 405         return FALSE;
 406 }
 407
 408
 409 /* DONE and ERROR are emitted only once, thus they can have normal priority
 410    PERCENT and AREA_READY should be processed ASAP
 411 */
 412
 413 static void image_loader_emit_done(ImageLoader *il)
 414 {
 415         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 416 }
 417
 418 static void image_loader_emit_error(ImageLoader *il)
 419 {
 420         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 421 }
 422
 423 static void image_loader_emit_percent(ImageLoader *il)
 424 {
 425         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 426 }
 427
 428 static void image_loader_emit_size(ImageLoader *il)
 429 {
 430         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_size_cb, il, NULL);
 431 }
 432
 433 static ImageLoaderAreaParam *image_loader_queue_area_ready(ImageLoader *il, GList **list, guint x, guint y, guint w, guint h)
 434 {
 435         if (*list)
 436                 {
 437                 ImageLoaderAreaParam *prev_par = (*list)->data;
 438                 if (prev_par->x == x && prev_par->w == w &&
 439                     prev_par->y + prev_par->h == y)
 440                         {
 441                         /* we can merge the notifications */
 442                         prev_par->h += h;
 443                         return NULL;
 444                         }
 445                 if (prev_par->x == x && prev_par->w == w &&
 446                     y + h == prev_par->y)
 447                         {
 448                         /* we can merge the notifications */
 449                         prev_par->h += h;
 450                         prev_par->y = y;
 451                         return NULL;
 452                         }
 453                 if (prev_par->y == y && prev_par->h == h &&
 454                     prev_par->x + prev_par->w == x)
 455                         {
 456                         /* we can merge the notifications */
 457                         prev_par->w += w;
 458                         return NULL;
 459                         }
 460                 if (prev_par->y == y && prev_par->h == h &&
 461                     x + w == prev_par->x)
 462                         {
 463                         /* we can merge the notifications */
 464                         prev_par->w += w;
 465                         prev_par->x = x;
 466                         return NULL;
 467                         }
 468                 }
 469
 470         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 471         par->il = il;
 472         par->x = x;
 473         par->y = y;
 474         par->w = w;
 475         par->h = h;
 476
 477         *list = g_list_prepend(*list, par);
 478         return par;
 479 }
 480
 481 /* this function expects that il->data_mutex is locked by caller */
 482 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 483 {
 484         ImageLoaderAreaParam *par = image_loader_queue_area_ready(il, &il->area_param_list, x, y, w, h);
 485
 486         if (par)
 487                 {
 488                 g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 489                 }
 490 }
 491
 492 /**************************************************************************************/
 493 /* the following functions may be executed in separate thread */
 494
 495 /* this function expects that il->data_mutex is locked by caller */
 496 static void image_loader_queue_delayed_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 497 {
 498         image_loader_queue_area_ready(il, &il->area_param_delayed_list, x, y, w, h);
 499 }
 500
 501
 502
 503 static gboolean image_loader_get_stopping(ImageLoader *il)
 504 {
 505         gboolean ret;
 506         if (!il) return FALSE;
 507
 508         g_mutex_lock(il->data_mutex);
 509         ret = il->stopping;
 510         g_mutex_unlock(il->data_mutex);
 511
 512         return ret;
 513 }
 514
 515
 516 static void image_loader_sync_pixbuf(ImageLoader *il)
 517 {
 518         GdkPixbuf *pb;
 519
 520         g_mutex_lock(il->data_mutex);
 521
 522         if (!il->loader)
 523                 {
 524                 g_mutex_unlock(il->data_mutex);
 525                 return;
 526                 }
 527
 528         pb = il->backend.get_pixbuf(il->loader);
 529
 530         if (pb == il->pixbuf)
 531                 {
 532                 g_mutex_unlock(il->data_mutex);
 533                 return;
 534                 }
 535
 536         if (g_ascii_strcasecmp(".jps", il->fd->extension) == 0)
 537                 {
 538                 g_object_set_data(G_OBJECT(pb), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
 539                 }
 540
 541         if (il->pixbuf) g_object_unref(il->pixbuf);
 542
 543         il->pixbuf = pb;
 544         if (il->pixbuf) g_object_ref(il->pixbuf);
 545
 546         g_mutex_unlock(il->data_mutex);
 547 }
 548
 549 static void image_loader_area_updated_cb(gpointer loader,
 550                                  guint x, guint y, guint w, guint h,
 551                                  gpointer data)
 552 {
 553         ImageLoader *il = data;
 554
 555         if (!image_loader_get_pixbuf(il))
 556                 {
 557                 image_loader_sync_pixbuf(il);
 558                 if (!image_loader_get_pixbuf(il))
 559                         {
 560                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 561                         }
 562                 }
 563
 564         g_mutex_lock(il->data_mutex);
 565         if (il->delay_area_ready)
 566                 image_loader_queue_delayed_area_ready(il, x, y, w, h);
 567         else
 568                 image_loader_emit_area_ready(il, x, y, w, h);
 569
 570         if (il->stopping) il->backend.abort(il->loader);
 571
 572         g_mutex_unlock(il->data_mutex);
 573 }
 574
 575 static void image_loader_area_prepared_cb(gpointer loader, gpointer data)
 576 {
 577         ImageLoader *il = data;
 578         GdkPixbuf *pb;
 579         guchar *pix;
 580         size_t h, rs;
 581
 582         /* a workaround for
 583            http://bugzilla.gnome.org/show_bug.cgi?id=547669
 584            http://bugzilla.gnome.org/show_bug.cgi?id=589334
 585         */
 586         gchar *format = il->backend.get_format_name(loader);
 587         if (strcmp(format, "svg") == 0 ||
 588             strcmp(format, "xpm") == 0)
 589                 {
 590                 g_free(format);
 591                 return;
 592                 }
 593
 594         g_free(format);
 595
 596         pb = il->backend.get_pixbuf(loader);
 597
 598         h = gdk_pixbuf_get_height(pb);
 599         rs = gdk_pixbuf_get_rowstride(pb);
 600         pix = gdk_pixbuf_get_pixels(pb);
 601
 602         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 603
 604 }
 605
 606 static void image_loader_size_cb(gpointer loader,
 607                                  gint width, gint height, gpointer data)
 608 {
 609         ImageLoader *il = data;
 610         gchar **mime_types;
 611         gboolean scale = FALSE;
 612         gint n;
 613
 614         g_mutex_lock(il->data_mutex);
 615         il->actual_width = width;
 616         il->actual_height = height;
 617         if (il->requested_width < 1 || il->requested_height < 1)
 618                 {
 619                 g_mutex_unlock(il->data_mutex);
 620                 image_loader_emit_size(il);
 621                 return;
 622                 }
 623         g_mutex_unlock(il->data_mutex);
 624
 625 #ifdef HAVE_FFMPEGTHUMBNAILER
 626         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 627                 scale = TRUE;
 628 #endif
 629         mime_types = il->backend.get_format_mime_types(loader);
 630         n = 0;
 631         while (mime_types[n] && !scale)
 632                 {
 633                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 634                 n++;
 635                 }
 636         g_strfreev(mime_types);
 637
 638         if (!scale)
 639                 {
 640                 image_loader_emit_size(il);
 641                 return;
 642                 }
 643
 644         g_mutex_lock(il->data_mutex);
 645
 646         gint nw, nh;
 647         if (width > il->requested_width || height > il->requested_height)
 648                 {
 649
 650                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 651                         {
 652                         nw = il->requested_width;
 653                         nh = (gdouble)nw / width * height;
 654                         if (nh < 1) nh = 1;
 655                         }
 656                 else
 657                         {
 658                         nh = il->requested_height;
 659                         nw = (gdouble)nh / height * width;
 660                         if (nw < 1) nw = 1;
 661                         }
 662
 663                 il->actual_width = nw;
 664                 il->actual_height = nh;
 665                 il->backend.set_size(loader, nw, nh);
 666                 il->shrunk = TRUE;
 667                 }
 668
 669         g_mutex_unlock(il->data_mutex);
 670         image_loader_emit_size(il);
 671 }
 672
 673 static void image_loader_stop_loader(ImageLoader *il)
 674 {
 675         if (!il) return;
 676
 677         if (il->loader)
 678                 {
 679                 /* some loaders do not have a pixbuf till close, order is important here */
 680                 il->backend.close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 681                 image_loader_sync_pixbuf(il);
 682                 il->backend.free(il->loader);
 683                 il->loader = NULL;
 684                 }
 685         g_mutex_lock(il->data_mutex);
 686         il->done = TRUE;
 687         g_mutex_unlock(il->data_mutex);
 688 }
 689
 690 static void image_loader_setup_loader(ImageLoader *il)
 691 {
 692 #if defined HAVE_TIFF || defined HAVE_PDF || defined HAVE_HEIF || defined HAVE_DJVU
 693         gchar *format;
 694 #endif
 695
 696         gint external_preview = 1;
 697
 698         g_mutex_lock(il->data_mutex);
 699
 700         if (options->external_preview.enable)
 701                 {
 702                 gchar *cmd_line;
 703                 gchar *tilde_filename;
 704
 705                 tilde_filename = expand_tilde(options->external_preview.select);
 706
 707                 cmd_line = g_strdup_printf("\"%s\" \"%s\"" , tilde_filename, il->fd->path);
 708
 709                 external_preview = runcmd(cmd_line);
 710                 g_free(cmd_line);
 711                 g_free(tilde_filename);
 712                 }
 713
 714         if (external_preview == 0)
 715                 {
 716                 DEBUG_1("Using custom external loader");
 717                 image_loader_backend_set_external(&il->backend);
 718                 }
 719         else
 720
 721 #ifdef HAVE_FFMPEGTHUMBNAILER
 722         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 723                 {
 724                 DEBUG_1("Using custom ffmpegthumbnailer loader");
 725                 image_loader_backend_set_ft(&il->backend);
 726                 }
 727         else
 728 #endif
 729 #ifdef HAVE_PDF
 730         if (il->bytes_total >= 4 &&
 731             (memcmp(il->mapped_file + 0, "%PDF", 4) == 0))
 732                 {
 733                 DEBUG_1("Using custom pdf loader");
 734                 image_loader_backend_set_pdf(&il->backend);
 735                 }
 736         else
 737 #endif
 738 #ifdef HAVE_HEIF
 739         if (il->bytes_total >= 12 &&
 740                 ((memcmp(il->mapped_file + 4, "ftypheic", 8) == 0) ||
 741                 (memcmp(il->mapped_file + 4, "ftypmsf1", 8) == 0) ||
 742                 (memcmp(il->mapped_file + 4, "ftypmif1", 8) == 0) ||
 743                 (memcmp(il->mapped_file + 4, "ftypavif", 8) == 0)))
 744                 {
 745                 DEBUG_1("Using custom heif loader");
 746                 image_loader_backend_set_heif(&il->backend);
 747                 }
 748         else
 749 #endif
 750 #ifdef HAVE_WEBP
 751         if (il->bytes_total >= 12 &&
 752                 (memcmp(il->mapped_file, "RIFF", 4) == 0) &&
 753                 (memcmp(il->mapped_file + 8, "WEBP", 4) == 0))
 754                 {
 755                 DEBUG_1("Using custom webp loader");
 756                 image_loader_backend_set_webp(&il->backend);
 757                 }
 758         else
 759 #endif
 760 #ifdef HAVE_DJVU
 761         if (il->bytes_total >= 16 &&
 762                 (memcmp(il->mapped_file, "AT&TFORM", 8) == 0) &&
 763                 (memcmp(il->mapped_file + 12, "DJV", 3) == 0))
 764                 {
 765                 DEBUG_1("Using custom djvu loader");
 766                 image_loader_backend_set_djvu(&il->backend);
 767                 }
 768         else
 769 #endif
 770 #ifdef HAVE_JPEG
 771         if (il->bytes_total >= 2 && il->mapped_file[0] == 0xff && il->mapped_file[1] == 0xd8)
 772                 {
 773                 DEBUG_1("Using custom jpeg loader");
 774                 image_loader_backend_set_jpeg(&il->backend);
 775                 }
 776 #ifndef HAVE_RAW
 777         else
 778         if (il->bytes_total >= 11 &&
 779                 (memcmp(il->mapped_file + 4, "ftypcrx", 7) == 0) &&
 780                 (memcmp(il->mapped_file + 64, "CanonCR3", 8) == 0))
 781                 {
 782                 DEBUG_1("Using custom cr3 loader");
 783                 image_loader_backend_set_cr3(&il->backend);
 784                 }
 785 #endif
 786         else
 787 #endif
 788 #ifdef HAVE_TIFF
 789         if (il->bytes_total >= 10 &&
 790             (memcmp(il->mapped_file, "MM\0*", 4) == 0 ||
 791              memcmp(il->mapped_file, "MM\0+\0\x08\0\0", 8) == 0 ||
 792              memcmp(il->mapped_file, "II+\0\x08\0\0\0", 8) == 0 ||
 793              memcmp(il->mapped_file, "II*\0", 4) == 0))
 794                 {
 795                 DEBUG_1("Using custom tiff loader");
 796                 image_loader_backend_set_tiff(&il->backend);
 797                 }
 798         else
 799 #endif
 800         if (il->bytes_total >= 3 && il->mapped_file[0] == 0x44 && il->mapped_file[1] == 0x44 && il->mapped_file[2] == 0x53)
 801                 {
 802                 DEBUG_1("Using dds loader");
 803                 image_loader_backend_set_dds(&il->backend);
 804                 }
 805         else
 806         if (il->bytes_total >= 6 &&
 807                 (memcmp(il->mapped_file, "8BPS\0\x01", 6) == 0))
 808                 {
 809                 DEBUG_1("Using custom psd loader");
 810                 image_loader_backend_set_psd(&il->backend);
 811                 }
 812         else
 813 #ifdef HAVE_J2K
 814         if (il->bytes_total >= 12 &&
 815                 (memcmp(il->mapped_file, "\0\0\0\x0CjP\x20\x20\x0D\x0A\x87\x0A", 12) == 0))
 816                 {
 817                 DEBUG_1("Using custom j2k loader");
 818                 image_loader_backend_set_j2k(&il->backend);
 819                 }
 820         else
 821 #endif
 822 #ifdef HAVE_JPEGXL
 823         if (il->bytes_total >= 12 &&
 824                 (memcmp(il->mapped_file, "\0\0\0\x0C\x4A\x58\x4C\x20\x0D\x0A\x87\x0A", 12) == 0))
 825                 {
 826                 DEBUG_1("Using custom jpeg xl loader");
 827                 image_loader_backend_set_jpegxl(&il->backend);
 828                 }
 829         else
 830         if (il->bytes_total >= 2 &&
 831                 (memcmp(il->mapped_file, "\xFF\x0A", 2) == 0))
 832                 {
 833                 DEBUG_1("Using custom jpeg xl loader");
 834                 image_loader_backend_set_jpegxl(&il->backend);
 835                 }
 836         else
 837 #endif
 838         if (il->fd->format_class == FORMAT_CLASS_COLLECTION)
 839                 {
 840                 DEBUG_1("Using custom collection loader");
 841                 image_loader_backend_set_collection(&il->backend);
 842                 }
 843         else
 844         if (g_strcmp0(strrchr(il->fd->path, '.'), ".svgz") == 0)
 845                 {
 846                 DEBUG_1("Using custom svgz loader");
 847                 image_loader_backend_set_svgz(&il->backend);
 848                 }
 849         else
 850                 image_loader_backend_set_default(&il->backend);
 851
 852         il->loader = il->backend.loader_new(image_loader_area_updated_cb, image_loader_size_cb, image_loader_area_prepared_cb, il);
 853
 854 #ifdef HAVE_TIFF
 855         format = il->backend.get_format_name(il->loader);
 856         if (g_strcmp0(format, "tiff") == 0)
 857                 {
 858                 il->backend.set_page_num(il->loader, il->fd->page_num);
 859                 }
 860         g_free(format);
 861 #endif
 862
 863 #ifdef HAVE_PDF
 864         format = il->backend.get_format_name(il->loader);
 865         if (g_strcmp0(format, "pdf") == 0)
 866                 {
 867                 il->backend.set_page_num(il->loader, il->fd->page_num);
 868                 }
 869         g_free(format);
 870 #endif
 871
 872 #ifdef HAVE_HEIF
 873         format = il->backend.get_format_name(il->loader);
 874         if (g_strcmp0(format, "heif") == 0)
 875                 {
 876                 il->backend.set_page_num(il->loader, il->fd->page_num);
 877                 }
 878         g_free(format);
 879 #endif
 880
 881 #ifdef HAVE_DJVU
 882         format = il->backend.get_format_name(il->loader);
 883         if (g_strcmp0(format, "djvu") == 0)
 884                 {
 885                 il->backend.set_page_num(il->loader, il->fd->page_num);
 886                 }
 887         g_free(format);
 888 #endif
 889
 890         il->fd->format_name = il->backend.get_format_name(il->loader);
 891
 892         g_mutex_unlock(il->data_mutex);
 893 }
 894
 895
 896 static void image_loader_done(ImageLoader *il)
 897 {
 898         image_loader_stop_loader(il);
 899
 900         image_loader_emit_done(il);
 901 }
 902
 903 static void image_loader_error(ImageLoader *il)
 904 {
 905         image_loader_stop_loader(il);
 906
 907         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 908
 909         image_loader_emit_error(il);
 910 }
 911
 912 static gboolean image_loader_continue(ImageLoader *il)
 913 {
 914         gint b;
 915         gint c;
 916
 917         if (!il) return FALSE;
 918
 919         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 920         while (c > 0 && !image_loader_get_stopping(il))
 921                 {
 922                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 923
 924                 if (b == 0)
 925                         {
 926                         image_loader_done(il);
 927                         return FALSE;
 928                         }
 929
 930                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 931                         {
 932                         image_loader_error(il);
 933                         return FALSE;
 934                         }
 935
 936                 il->bytes_read += b;
 937
 938                 c--;
 939                 }
 940
 941         if (il->bytes_total > 0)
 942                 {
 943                 image_loader_emit_percent(il);
 944                 }
 945
 946         return TRUE;
 947 }
 948
 949 static gboolean image_loader_begin(ImageLoader *il)
 950 {
 951 #if defined HAVE_TIFF || defined HAVE_PDF || defined HAVE_HEIF || defined HAVE_DJVU
 952         gchar *format;
 953 #endif
 954         gssize b;
 955
 956         if (il->pixbuf) return FALSE;
 957
 958         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 959         if (b < 1) return FALSE;
 960
 961         image_loader_setup_loader(il);
 962
 963         g_assert(il->bytes_read == 0);
 964         if (il->backend.load) {
 965                 b = il->bytes_total;
 966                 if (!il->backend.load(il->loader, il->mapped_file, b, &il->error))
 967                         {
 968                         image_loader_stop_loader(il);
 969                         return FALSE;
 970                         }
 971         }
 972         else if (!il->backend.write(il->loader, il->mapped_file, b, &il->error))
 973                 {
 974                 image_loader_stop_loader(il);
 975                 return FALSE;
 976                 }
 977
 978 #ifdef HAVE_PDF
 979         format = il->backend.get_format_name(il->loader);
 980         if (g_strcmp0(format, "pdf") == 0)
 981                 {
 982                 gint i = il->backend.get_page_total(il->loader);
 983                 file_data_set_page_total(il->fd, i);
 984                 }
 985         g_free(format);
 986 #endif
 987 #ifdef HAVE_HEIF
 988         format = il->backend.get_format_name(il->loader);
 989         if (g_strcmp0(format, "heif") == 0)
 990                 {
 991                 gint i = il->backend.get_page_total(il->loader);
 992                 file_data_set_page_total(il->fd, i);
 993                 }
 994         g_free(format);
 995 #endif
 996 #ifdef HAVE_DJVU
 997         format = il->backend.get_format_name(il->loader);
 998         if (g_strcmp0(format, "djvu") == 0)
 999                 {
1000                 gint i = il->backend.get_page_total(il->loader);
1001                 file_data_set_page_total(il->fd, i);
1002                 }
1003         g_free(format);
1004 #endif
1005 #ifdef HAVE_TIFF
1006         format = il->backend.get_format_name(il->loader);
1007         if (g_strcmp0(format, "tiff") == 0)
1008                 {
1009                 gint i = il->backend.get_page_total(il->loader);
1010                 file_data_set_page_total(il->fd, i);
1011                 }
1012         g_free(format);
1013 #endif
1014
1015         il->bytes_read += b;
1016
1017         /* read until size is known */
1018         while (il->loader && !il->backend.get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
1019                 {
1020                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
1021                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
1022                         {
1023                         image_loader_stop_loader(il);
1024                         return FALSE;
1025                         }
1026                 il->bytes_read += b;
1027                 }
1028         if (!il->pixbuf) image_loader_sync_pixbuf(il);
1029
1030         if (il->bytes_read == il->bytes_total || b < 1)
1031                 {
1032                 /* done, handle (broken) loaders that do not have pixbuf till close */
1033                 image_loader_stop_loader(il);
1034
1035                 if (!il->pixbuf) return FALSE;
1036
1037                 image_loader_done(il);
1038                 return TRUE;
1039                 }
1040
1041         if (!il->pixbuf)
1042                 {
1043                 image_loader_stop_loader(il);
1044                 return FALSE;
1045                 }
1046
1047         return TRUE;
1048 }
1049
1050 /**************************************************************************************/
1051 /* the following functions are always executed in the main thread */
1052
1053
1054 static gboolean image_loader_setup_source(ImageLoader *il)
1055 {
1056         struct stat st;
1057         gchar *pathl;
1058
1059         if (!il || il->loader || il->mapped_file) return FALSE;
1060
1061         il->mapped_file = NULL;
1062
1063         if (il->fd)
1064                 {
1065                 ExifData *exif = exif_read_fd(il->fd);
1066
1067                 if (options->thumbnails.use_exif)
1068                         {
1069                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, il->requested_width, il->requested_height);
1070
1071                         if (il->mapped_file)
1072                                 {
1073                                 il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1074                                 }
1075                         }
1076                 else
1077                         {
1078                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
1079
1080                         if (il->mapped_file)
1081                                 {
1082                                 /* Both exiv2 and libraw sometimes return a pointer to a file
1083                                  * section that is not a jpeg */
1084                                 if (!(il->mapped_file[0] == 0xFF && il->mapped_file[1] == 0xD8))
1085                                         {
1086                                         il->mapped_file = NULL;
1087                                         }
1088                                 else
1089                                         {
1090                                         il->preview = IMAGE_LOADER_PREVIEW_EXIF;
1091                                         }
1092                                 }
1093                         }
1094
1095                 /* If exiv2 does not find a thumbnail, try libraw (which may be slower) */
1096                 if (!il->mapped_file)
1097                         {
1098                         il->mapped_file = libraw_get_preview(il, (guint *)&il->bytes_total);
1099
1100                         if (il->mapped_file)
1101                                 {
1102                                 if (!(il->mapped_file[0] == 0xFF && il->mapped_file[1] == 0xD8))
1103                                         {
1104                                         il->mapped_file = NULL;
1105                                         }
1106                                 else
1107                                         {
1108                                         il->preview = IMAGE_LOADER_PREVIEW_LIBRAW;
1109                                         }
1110                                 }
1111                         }
1112
1113                 if (il->mapped_file)
1114                         {
1115                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
1116                         }
1117                 exif_free_fd(il->fd, exif);
1118                 }
1119
1120
1121         if (!il->mapped_file)
1122                 {
1123                 /* normal file */
1124                 gint load_fd;
1125
1126                 pathl = path_from_utf8(il->fd->path);
1127                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
1128                 g_free(pathl);
1129                 if (load_fd == -1) return FALSE;
1130
1131                 if (fstat(load_fd, &st) == 0)
1132                         {
1133                         il->bytes_total = st.st_size;
1134                         }
1135                 else
1136                         {
1137                         close(load_fd);
1138                         return FALSE;
1139                         }
1140
1141                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
1142                 close(load_fd);
1143                 if (il->mapped_file == MAP_FAILED)
1144                         {
1145                         il->mapped_file = 0;
1146                         return FALSE;
1147                         }
1148                 il->preview = IMAGE_LOADER_PREVIEW_NONE;
1149                 }
1150
1151         return TRUE;
1152 }
1153
1154 static void image_loader_stop_source(ImageLoader *il)
1155 {
1156         if (!il) return;
1157
1158         if (il->mapped_file)
1159                 {
1160                 if (il->preview == IMAGE_LOADER_PREVIEW_EXIF)
1161                         {
1162                         exif_free_preview(il->mapped_file);
1163                         }
1164                 else if (il->preview == IMAGE_LOADER_PREVIEW_LIBRAW)
1165                         {
1166                         libraw_free_preview(il->mapped_file);
1167                         }
1168                 else
1169                         {
1170                         munmap(il->mapped_file, il->bytes_total);
1171                         }
1172                 il->mapped_file = NULL;
1173                 }
1174 }
1175
1176 static void image_loader_stop(ImageLoader *il)
1177 {
1178         if (!il) return;
1179
1180         if (il->idle_id)
1181                 {
1182                 g_source_remove(il->idle_id);
1183                 il->idle_id = 0;
1184                 }
1185
1186         if (il->thread)
1187                 {
1188                 /* stop loader in the other thread */
1189                 g_mutex_lock(il->data_mutex);
1190                 il->stopping = TRUE;
1191                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
1192                 g_mutex_unlock(il->data_mutex);
1193                 }
1194
1195         image_loader_stop_loader(il);
1196         image_loader_stop_source(il);
1197
1198 }
1199
1200 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
1201 {
1202         g_mutex_lock(il->data_mutex);
1203         il->delay_area_ready = enable;
1204         if (!enable)
1205                 {
1206                 /* send delayed */
1207                 GList *list, *work;
1208                 list = g_list_reverse(il->area_param_delayed_list);
1209                 il->area_param_delayed_list = NULL;
1210                 g_mutex_unlock(il->data_mutex);
1211
1212                 work = list;
1213
1214                 while (work)
1215                         {
1216                         ImageLoaderAreaParam *par = work->data;
1217                         work = work->next;
1218
1219                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
1220                         g_free(par);
1221                         }
1222                 g_list_free(list);
1223                 }
1224         else
1225                 {
1226                 /* just unlock */
1227                 g_mutex_unlock(il->data_mutex);
1228                 }
1229 }
1230
1231
1232 /**************************************************************************************/
1233 /* execution via idle calls */
1234
1235 static gboolean image_loader_idle_cb(gpointer data)
1236 {
1237         gboolean ret = FALSE;
1238         ImageLoader *il = data;
1239
1240         if (il->idle_id)
1241                 {
1242                 ret = image_loader_continue(il);
1243                 }
1244
1245         if (!ret)
1246                 {
1247                 image_loader_stop_source(il);
1248                 }
1249
1250         return ret;
1251 }
1252
1253
1254 static gboolean image_loader_start_idle(ImageLoader *il)
1255 {
1256         gboolean ret;
1257
1258         if (!il) return FALSE;
1259
1260         if (!il->fd) return FALSE;
1261
1262         if (!image_loader_setup_source(il)) return FALSE;
1263
1264         ret = image_loader_begin(il);
1265
1266         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
1267         return ret;
1268 }
1269
1270 /**************************************************************************************/
1271 /* execution via thread */
1272
1273 #ifdef HAVE_GTHREAD
1274 static GThreadPool *image_loader_thread_pool = NULL;
1275
1276 static GCond *image_loader_prio_cond = NULL;
1277 static GMutex *image_loader_prio_mutex = NULL;
1278 static gint image_loader_prio_num = 0;
1279
1280
1281 static void image_loader_thread_enter_high(void)
1282 {
1283         g_mutex_lock(image_loader_prio_mutex);
1284         image_loader_prio_num++;
1285         g_mutex_unlock(image_loader_prio_mutex);
1286 }
1287
1288 static void image_loader_thread_leave_high(void)
1289 {
1290         g_mutex_lock(image_loader_prio_mutex);
1291         image_loader_prio_num--;
1292         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
1293         g_mutex_unlock(image_loader_prio_mutex);
1294 }
1295
1296 static void image_loader_thread_wait_high(void)
1297 {
1298         g_mutex_lock(image_loader_prio_mutex);
1299         while (image_loader_prio_num)
1300                 {
1301                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
1302                 }
1303
1304         g_mutex_unlock(image_loader_prio_mutex);
1305 }
1306
1307
1308 static void image_loader_thread_run(gpointer data, gpointer user_data)
1309 {
1310         ImageLoader *il = data;
1311         gboolean cont;
1312         gboolean err;
1313
1314         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1315                 {
1316                 /* low prio, wait until high prio tasks finishes */
1317                 image_loader_thread_wait_high();
1318                 }
1319         else
1320                 {
1321                 /* high prio */
1322                 image_loader_thread_enter_high();
1323                 }
1324
1325         err = !image_loader_begin(il);
1326
1327         if (err)
1328                 {
1329                 /*
1330                 loader failed, we have to send signal
1331                 (idle mode returns the image_loader_begin return value directly)
1332                 (success is always reported indirectly from image_loader_begin)
1333                 */
1334                 image_loader_emit_error(il);
1335                 }
1336
1337         cont = !err;
1338
1339         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
1340                 {
1341                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1342                         {
1343                         /* low prio, wait until high prio tasks finishes */
1344                         image_loader_thread_wait_high();
1345                         }
1346                 cont = image_loader_continue(il);
1347                 }
1348         image_loader_stop_loader(il);
1349
1350         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
1351                 {
1352                 /* high prio */
1353                 image_loader_thread_leave_high();
1354                 }
1355
1356         g_mutex_lock(il->data_mutex);
1357         il->can_destroy = TRUE;
1358         g_cond_signal(il->can_destroy_cond);
1359         g_mutex_unlock(il->data_mutex);
1360
1361 }
1362
1363
1364 static gboolean image_loader_start_thread(ImageLoader *il)
1365 {
1366         if (!il) return FALSE;
1367
1368         if (!il->fd) return FALSE;
1369
1370         il->thread = TRUE;
1371
1372         if (!image_loader_setup_source(il)) return FALSE;
1373
1374         if (!image_loader_thread_pool)
1375                 {
1376                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
1377 #if GLIB_CHECK_VERSION(2,32,0)
1378                 if (!image_loader_prio_cond) image_loader_prio_cond = g_new(GCond, 1);
1379                 g_cond_init(image_loader_prio_cond);
1380                 if (!image_loader_prio_mutex) image_loader_prio_mutex = g_new(GMutex, 1);
1381                 g_mutex_init(image_loader_prio_mutex);
1382 #else
1383                 image_loader_prio_cond = g_cond_new();
1384                 image_loader_prio_mutex = g_mutex_new();
1385 #endif
1386                 }
1387
1388         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
1389
1390         g_thread_pool_push(image_loader_thread_pool, il, NULL);
1391         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
1392
1393         return TRUE;
1394 }
1395 #endif /* HAVE_GTHREAD */
1396
1397
1398 /**************************************************************************************/
1399 /* public interface */
1400
1401
1402 gboolean image_loader_start(ImageLoader *il)
1403 {
1404         if (!il) return FALSE;
1405
1406         if (!il->fd) return FALSE;
1407
1408 #ifdef HAVE_GTHREAD
1409         return image_loader_start_thread(il);
1410 #else
1411         return image_loader_start_idle(il);
1412 #endif
1413 }
1414
1415
1416 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
1417 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
1418 {
1419         GdkPixbuf *ret;
1420         if (!il) return NULL;
1421
1422         g_mutex_lock(il->data_mutex);
1423         ret = il->pixbuf;
1424         g_mutex_unlock(il->data_mutex);
1425         return ret;
1426 }
1427
1428 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
1429 {
1430         if (!il) return;
1431
1432         g_mutex_lock(il->data_mutex);
1433         il->requested_width = width;
1434         il->requested_height = height;
1435         g_mutex_unlock(il->data_mutex);
1436 }
1437
1438 void image_loader_set_buffer_size(ImageLoader *il, guint count)
1439 {
1440         if (!il) return;
1441
1442         g_mutex_lock(il->data_mutex);
1443         il->idle_read_loop_count = count ? count : 1;
1444         g_mutex_unlock(il->data_mutex);
1445 }
1446
1447 void image_loader_set_priority(ImageLoader *il, gint priority)
1448 {
1449         if (!il) return;
1450
1451         if (il->thread) return; /* can't change prio if the thread already runs */
1452         il->idle_priority = priority;
1453 }
1454
1455
1456 gdouble image_loader_get_percent(ImageLoader *il)
1457 {
1458         gdouble ret;
1459         if (!il) return 0.0;
1460
1461         g_mutex_lock(il->data_mutex);
1462         if (il->bytes_total == 0)
1463                 {
1464                 ret = 0.0;
1465                 }
1466         else
1467                 {
1468                 ret = (gdouble)il->bytes_read / il->bytes_total;
1469                 }
1470         g_mutex_unlock(il->data_mutex);
1471         return ret;
1472 }
1473
1474 gboolean image_loader_get_is_done(ImageLoader *il)
1475 {
1476         gboolean ret;
1477         if (!il) return FALSE;
1478
1479         g_mutex_lock(il->data_mutex);
1480         ret = il->done;
1481         g_mutex_unlock(il->data_mutex);
1482
1483         return ret;
1484 }
1485
1486 FileData *image_loader_get_fd(ImageLoader *il)
1487 {
1488         FileData *ret;
1489         if (!il) return NULL;
1490
1491         g_mutex_lock(il->data_mutex);
1492         ret = il->fd;
1493         g_mutex_unlock(il->data_mutex);
1494
1495         return ret;
1496 }
1497
1498 gboolean image_loader_get_shrunk(ImageLoader *il)
1499 {
1500         gboolean ret;
1501         if (!il) return FALSE;
1502
1503         g_mutex_lock(il->data_mutex);
1504         ret = il->shrunk;
1505         g_mutex_unlock(il->data_mutex);
1506         return ret;
1507 }
1508
1509 const gchar *image_loader_get_error(ImageLoader *il)
1510 {
1511         const gchar *ret = NULL;
1512         if (!il) return NULL;
1513         g_mutex_lock(il->data_mutex);
1514         if (il->error) ret = il->error->message;
1515         g_mutex_unlock(il->data_mutex);
1516         return ret;
1517 }
1518
1519
1520 /**
1521  *  @FIXME this can be rather slow and blocks until the size is known
1522  */
1523 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1524 {
1525         ImageLoader *il;
1526         gboolean success;
1527
1528         il = image_loader_new(fd);
1529
1530         success = image_loader_start_idle(il);
1531
1532         if (success && il->pixbuf)
1533                 {
1534                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1535                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1536                 }
1537         else
1538                 {
1539                 if (width) *width = -1;
1540                 if (height) *height = -1;
1541                 }
1542
1543         image_loader_free(il);
1544
1545         return success;
1546 }
1547 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */