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