src/image-load.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 The Geeqie Team
   5  *
   6  * Author: John Ellis
   7  *
   8  * This software is released under the GNU General Public License (GNU GPL).
   9  * Please read the included file COPYING for more information.
  10  * This software comes with no warranty of any kind, use at your own risk!
  11  */
  12
  13
  14 #include "main.h"
  15 #include "image-load.h"
  16
  17 #include "exif.h"
  18 #include "filedata.h"
  19 #include "ui_fileops.h"
  20 #include "gq-marshal.h"
  21
  22 #include <fcntl.h>
  23 #include <sys/mman.h>
  24
  25
  26 /**************************************************************************************/
  27 /* image looader class */
  28
  29
  30 enum {
  31         SIGNAL_AREA_READY = 0,
  32         SIGNAL_ERROR,
  33         SIGNAL_DONE,
  34         SIGNAL_PERCENT,
  35         SIGNAL_COUNT
  36 };
  37
  38 static guint signals[SIGNAL_COUNT] = { 0 };
  39
  40 static void image_loader_init (GTypeInstance *instance, gpointer g_class);
  41 static void image_loader_class_init (ImageLoaderClass *class);
  42 static void image_loader_finalize(GObject *object);
  43 static void image_loader_stop(ImageLoader *il);
  44
  45 GType image_loader_get_type (void)
  46 {
  47         static GType type = 0;
  48         if (type == 0)
  49                 {
  50                 static const GTypeInfo info = {
  51                         sizeof (ImageLoaderClass),
  52                         NULL,   /* base_init */
  53                         NULL,   /* base_finalize */
  54                         (GClassInitFunc)image_loader_class_init, /* class_init */
  55                         NULL,   /* class_finalize */
  56                         NULL,   /* class_data */
  57                         sizeof (ImageLoader),
  58                         0,      /* n_preallocs */
  59                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  60                         NULL    /* value_table */
  61                         };
  62                 type = g_type_register_static (G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  63                 }
  64         return type;
  65 }
  66
  67 static void image_loader_init (GTypeInstance *instance, gpointer g_class)
  68 {
  69         ImageLoader *il = (ImageLoader *)instance;
  70
  71         il->pixbuf = NULL;
  72         il->idle_id = -1;
  73         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  74         il->done = FALSE;
  75         il->loader = NULL;
  76
  77         il->bytes_read = 0;
  78         il->bytes_total = 0;
  79
  80         il->idle_done_id = -1;
  81
  82         il->idle_read_loop_count = options->image.idle_read_loop_count;
  83         il->read_buffer_size = options->image.read_buffer_size;
  84         il->mapped_file = NULL;
  85
  86         il->requested_width = 0;
  87         il->requested_height = 0;
  88         il->shrunk = FALSE;
  89
  90         il->can_destroy = TRUE;
  91
  92 #ifdef HAVE_GTHREAD
  93         il->data_mutex = g_mutex_new();
  94         il->can_destroy_cond = g_cond_new();
  95 #endif
  96         DEBUG_1("new image loader %p, bufsize=%u idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
  97 }
  98
  99 static void image_loader_class_init (ImageLoaderClass *class)
 100 {
 101         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 102
 103 //      gobject_class->set_property = image_loader_set_property;
 104 //      gobject_class->get_property = image_loader_get_property;
 105
 106         gobject_class->finalize = image_loader_finalize;
 107
 108
 109         signals[SIGNAL_AREA_READY] =
 110                 g_signal_new("area_ready",
 111                              G_OBJECT_CLASS_TYPE(gobject_class),
 112                              G_SIGNAL_RUN_LAST,
 113                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 114                              NULL, NULL,
 115                              gq_marshal_VOID__INT_INT_INT_INT,
 116                              G_TYPE_NONE, 4,
 117                              G_TYPE_INT,
 118                              G_TYPE_INT,
 119                              G_TYPE_INT,
 120                              G_TYPE_INT);
 121
 122         signals[SIGNAL_ERROR] =
 123                 g_signal_new("error",
 124                              G_OBJECT_CLASS_TYPE(gobject_class),
 125                              G_SIGNAL_RUN_LAST,
 126                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 127                              NULL, NULL,
 128                              g_cclosure_marshal_VOID__VOID,
 129                              G_TYPE_NONE, 0);
 130
 131         signals[SIGNAL_DONE] =
 132                 g_signal_new("done",
 133                              G_OBJECT_CLASS_TYPE(gobject_class),
 134                              G_SIGNAL_RUN_LAST,
 135                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 136                              NULL, NULL,
 137                              g_cclosure_marshal_VOID__VOID,
 138                              G_TYPE_NONE, 0);
 139
 140         signals[SIGNAL_PERCENT] =
 141                 g_signal_new("percent",
 142                              G_OBJECT_CLASS_TYPE(gobject_class),
 143                              G_SIGNAL_RUN_LAST,
 144                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 145                              NULL, NULL,
 146                              g_cclosure_marshal_VOID__DOUBLE,
 147                              G_TYPE_NONE, 1,
 148                              G_TYPE_DOUBLE);
 149
 150 }
 151
 152 static void image_loader_finalize(GObject *object)
 153 {
 154         ImageLoader *il = (ImageLoader *)object;
 155
 156         image_loader_stop(il);
 157
 158         DEBUG_1("freeing image loader %p bytes_read=%d", il, il->bytes_read);
 159
 160         if (il->idle_done_id != -1) g_source_remove(il->idle_done_id);
 161
 162         while (g_source_remove_by_user_data(il))
 163                 {
 164                 DEBUG_1("pending signals detected");
 165                 }
 166
 167         while (il->area_param_list)
 168                 {
 169                 DEBUG_1("pending area_ready signals detected");
 170                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 171                 g_free(il->area_param_list->data);
 172                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 173                 }
 174
 175         if (il->pixbuf) g_object_unref(il->pixbuf);
 176
 177         file_data_unref(il->fd);
 178 #ifdef HAVE_GTHREAD
 179         g_mutex_free(il->data_mutex);
 180         g_cond_free(il->can_destroy_cond);
 181 #endif
 182 }
 183
 184 void image_loader_free(ImageLoader *il)
 185 {
 186         if (!il) return;
 187         g_object_unref(G_OBJECT(il));
 188 }
 189
 190
 191 ImageLoader *image_loader_new(FileData *fd)
 192 {
 193         ImageLoader *il;
 194
 195         if (!fd) return NULL;
 196
 197         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 198
 199         il->fd = file_data_ref(fd);
 200
 201         return il;
 202 }
 203
 204 /**************************************************************************************/
 205 /* send signals via idle calbacks - the callback are executed in the main thread */
 206
 207 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 208 struct _ImageLoaderAreaParam {
 209         ImageLoader *il;
 210         guint x;
 211         guint y;
 212         guint w;
 213         guint h;
 214 };
 215
 216
 217 static gint image_loader_emit_area_ready_cb(gpointer data)
 218 {
 219         ImageLoaderAreaParam *par = data;
 220         ImageLoader *il = par->il;
 221         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 222         g_mutex_lock(il->data_mutex);
 223         il->area_param_list = g_list_remove(il->area_param_list, par);
 224         g_free(par);
 225         g_mutex_unlock(il->data_mutex);
 226
 227         return FALSE;
 228 }
 229
 230 static gint image_loader_emit_done_cb(gpointer data)
 231 {
 232         ImageLoader *il = data;
 233         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 234         return FALSE;
 235 }
 236
 237 static gint image_loader_emit_error_cb(gpointer data)
 238 {
 239         ImageLoader *il = data;
 240         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 241         return FALSE;
 242 }
 243
 244 static gint image_loader_emit_percent_cb(gpointer data)
 245 {
 246         ImageLoader *il = data;
 247         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 248         return FALSE;
 249 }
 250
 251 /* DONE and ERROR are emited only once, thus they can have normal priority
 252    PERCENT and AREA_READY should be processed ASAP
 253 */
 254
 255 static void image_loader_emit_done(ImageLoader *il)
 256 {
 257         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 258 }
 259
 260 static void image_loader_emit_error(ImageLoader *il)
 261 {
 262         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 263 }
 264
 265 static void image_loader_emit_percent(ImageLoader *il)
 266 {
 267         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 268 }
 269
 270 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 271 {
 272         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 273         par->il = il;
 274         par->x = x;
 275         par->y = y;
 276         par->w = w;
 277         par->h = h;
 278
 279         g_mutex_lock(il->data_mutex);
 280         il->area_param_list = g_list_prepend(il->area_param_list, par);
 281         g_mutex_unlock(il->data_mutex);
 282
 283         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 284 }
 285
 286 /**************************************************************************************/
 287 /* the following functions may be executed in separate thread */
 288
 289 static gint image_loader_get_stopping(ImageLoader *il)
 290 {
 291         gint ret;
 292         if (!il) return FALSE;
 293
 294         g_mutex_lock(il->data_mutex);
 295         ret = il->stopping;
 296         g_mutex_unlock(il->data_mutex);
 297
 298         return ret;
 299 }
 300
 301 static void image_loader_sync_pixbuf(ImageLoader *il)
 302 {
 303         GdkPixbuf *pb;
 304
 305         g_mutex_lock(il->data_mutex);
 306
 307         if (!il->loader)
 308                 {
 309                 g_mutex_unlock(il->data_mutex);
 310                 return;
 311                 }
 312
 313         pb = gdk_pixbuf_loader_get_pixbuf(il->loader);
 314
 315         if (pb == il->pixbuf)
 316                 {
 317                 g_mutex_unlock(il->data_mutex);
 318                 return;
 319                 }
 320
 321         if (il->pixbuf) g_object_unref(il->pixbuf);
 322
 323         il->pixbuf = pb;
 324         if (il->pixbuf) g_object_ref(il->pixbuf);
 325
 326         g_mutex_unlock(il->data_mutex);
 327 }
 328
 329 static void image_loader_area_updated_cb(GdkPixbufLoader *loader,
 330                                  guint x, guint y, guint w, guint h,
 331                                  gpointer data)
 332 {
 333         ImageLoader *il = data;
 334
 335         if (!image_loader_get_pixbuf(il))
 336                 {
 337                 image_loader_sync_pixbuf(il);
 338                 if (!image_loader_get_pixbuf(il))
 339                         {
 340                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 341                         }
 342                 }
 343         image_loader_emit_area_ready(il, x, y, w, h);
 344 }
 345
 346 static void image_loader_area_prepared_cb(GdkPixbufLoader *loader, gpointer data)
 347 {
 348         GdkPixbuf *pb;
 349         guchar *pix;
 350         size_t h, rs;
 351
 352         /* a workaround for http://bugzilla.gnome.org/show_bug.cgi?id=547669 */
 353         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 354         if (strcmp(format, "svg") == 0)
 355                 {
 356                 g_free(format);
 357                 return;
 358                 }
 359
 360         g_free(format);
 361
 362         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 363
 364         h = gdk_pixbuf_get_height(pb);
 365         rs = gdk_pixbuf_get_rowstride(pb);
 366         pix = gdk_pixbuf_get_pixels(pb);
 367
 368         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 369
 370 }
 371
 372 static void image_loader_size_cb(GdkPixbufLoader *loader,
 373                                  gint width, gint height, gpointer data)
 374 {
 375         ImageLoader *il = data;
 376         GdkPixbufFormat *format;
 377         gchar **mime_types;
 378         gint scale = FALSE;
 379         gint n;
 380
 381         g_mutex_lock(il->data_mutex);
 382         if (il->requested_width < 1 || il->requested_height < 1)
 383                 {
 384                 g_mutex_unlock(il->data_mutex);
 385                 return;
 386                 }
 387         g_mutex_unlock(il->data_mutex);
 388
 389         format = gdk_pixbuf_loader_get_format(loader);
 390         if (!format) return;
 391
 392         mime_types = gdk_pixbuf_format_get_mime_types(format);
 393         n = 0;
 394         while (mime_types[n])
 395                 {
 396                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 397                 n++;
 398                 }
 399         g_strfreev(mime_types);
 400
 401         if (!scale) return;
 402
 403         g_mutex_lock(il->data_mutex);
 404
 405         if (width > il->requested_width || height > il->requested_height)
 406                 {
 407                 gint nw, nh;
 408
 409                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 410                         {
 411                         nw = il->requested_width;
 412                         nh = (gdouble)nw / width * height;
 413                         if (nh < 1) nh = 1;
 414                         }
 415                 else
 416                         {
 417                         nh = il->requested_height;
 418                         nw = (gdouble)nh / height * width;
 419                         if (nw < 1) nw = 1;
 420                         }
 421
 422                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 423                 il->shrunk = TRUE;
 424                 }
 425         g_mutex_unlock(il->data_mutex);
 426
 427 }
 428
 429 static void image_loader_stop_loader(ImageLoader *il)
 430 {
 431         if (!il) return;
 432
 433         if (il->loader)
 434                 {
 435                 /* some loaders do not have a pixbuf till close, order is important here */
 436                 gdk_pixbuf_loader_close(il->loader, NULL);
 437                 image_loader_sync_pixbuf(il);
 438                 g_object_unref(G_OBJECT(il->loader));
 439                 il->loader = NULL;
 440                 }
 441         g_mutex_lock(il->data_mutex);
 442         il->done = TRUE;
 443         g_mutex_unlock(il->data_mutex);
 444 }
 445
 446 static void image_loader_setup_loader(ImageLoader *il)
 447 {
 448         g_mutex_lock(il->data_mutex);
 449         il->loader = gdk_pixbuf_loader_new();
 450
 451         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 452                          G_CALLBACK(image_loader_area_updated_cb), il);
 453         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 454                          G_CALLBACK(image_loader_size_cb), il);
 455         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 456                          G_CALLBACK(image_loader_area_prepared_cb), il);
 457         g_mutex_unlock(il->data_mutex);
 458 }
 459
 460
 461 static void image_loader_done(ImageLoader *il)
 462 {
 463         image_loader_stop_loader(il);
 464
 465         image_loader_emit_done(il);
 466 }
 467
 468 static void image_loader_error(ImageLoader *il)
 469 {
 470         image_loader_stop_loader(il);
 471
 472         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 473
 474         image_loader_emit_error(il);
 475 }
 476
 477 static gint image_loader_continue(ImageLoader *il)
 478 {
 479         gint b;
 480         gint c;
 481
 482         if (!il) return FALSE;
 483
 484         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 485         while (c > 0 && !image_loader_get_stopping(il))
 486                 {
 487                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 488
 489                 if (b == 0)
 490                         {
 491                         image_loader_done(il);
 492                         return FALSE;
 493                         }
 494
 495                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 496                         {
 497                         image_loader_error(il);
 498                         return FALSE;
 499                         }
 500
 501                 il->bytes_read += b;
 502
 503                 c--;
 504                 }
 505
 506         if (il->bytes_total > 0)
 507                 {
 508                 image_loader_emit_percent(il);
 509                 }
 510
 511         return TRUE;
 512 }
 513
 514 static gint image_loader_begin(ImageLoader *il)
 515 {
 516         gint b;
 517
 518         if (il->pixbuf) return FALSE;
 519
 520         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 521         if (b < 1) return FALSE;
 522
 523         image_loader_setup_loader(il);
 524
 525         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL))
 526                 {
 527                 image_loader_stop_loader(il);
 528                 return FALSE;
 529                 }
 530
 531         il->bytes_read += b;
 532
 533         /* read until size is known */
 534         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 535                 {
 536                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 537                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 538                         {
 539                         image_loader_stop_loader(il);
 540                         return FALSE;
 541                         }
 542                 il->bytes_read += b;
 543                 }
 544         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 545
 546         if (il->bytes_read == il->bytes_total || b < 1)
 547                 {
 548                 /* done, handle (broken) loaders that do not have pixbuf till close */
 549                 image_loader_stop_loader(il);
 550
 551                 if (!il->pixbuf) return FALSE;
 552
 553                 image_loader_done(il);
 554                 return TRUE;
 555                 }
 556
 557         if (!il->pixbuf)
 558                 {
 559                 image_loader_stop_loader(il);
 560                 return FALSE;
 561                 }
 562
 563         return TRUE;
 564 }
 565
 566 /**************************************************************************************/
 567 /* the following functions are always executed in the main thread */
 568
 569
 570 static gint image_loader_setup_source(ImageLoader *il)
 571 {
 572         struct stat st;
 573         gchar *pathl;
 574
 575         if (!il || il->loader || il->mapped_file) return FALSE;
 576
 577         il->mapped_file = NULL;
 578
 579         if (il->fd)
 580                 {
 581                 ExifData *exif = exif_read_fd(il->fd);
 582
 583                 il->mapped_file = exif_get_preview(exif, &il->bytes_total);
 584
 585                 if (il->mapped_file)
 586                         {
 587                         il->preview = TRUE;
 588                         DEBUG_1("Raw file %s contains embedded image", il->fd->path);
 589                         }
 590                 exif_free_fd(il->fd, exif);
 591                 }
 592
 593
 594         if (!il->mapped_file)
 595                 {
 596                 /* normal file */
 597                 gint load_fd;
 598
 599                 pathl = path_from_utf8(il->fd->path);
 600                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 601                 g_free(pathl);
 602                 if (load_fd == -1) return FALSE;
 603
 604                 if (fstat(load_fd, &st) == 0)
 605                         {
 606                         il->bytes_total = st.st_size;
 607                         }
 608                 else
 609                         {
 610                         close(load_fd);
 611                         return FALSE;
 612                         }
 613
 614                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 615                 close(load_fd);
 616                 if (il->mapped_file == MAP_FAILED)
 617                         {
 618                         il->mapped_file = 0;
 619                         return FALSE;
 620                         }
 621                 il->preview = FALSE;
 622                 }
 623
 624         return TRUE;
 625 }
 626
 627 static void image_loader_stop_source(ImageLoader *il)
 628 {
 629         if (!il) return;
 630
 631         if (il->mapped_file)
 632                 {
 633                 if (il->preview)
 634                         {
 635                         exif_free_preview(il->mapped_file);
 636                         }
 637                 else
 638                         {
 639                         munmap(il->mapped_file, il->bytes_total);
 640                         }
 641                 il->mapped_file = NULL;
 642                 }
 643 }
 644
 645 static void image_loader_stop(ImageLoader *il)
 646 {
 647         if (!il) return;
 648
 649         if (il->idle_id != -1)
 650                 {
 651                 g_source_remove(il->idle_id);
 652                 il->idle_id = -1;
 653                 }
 654
 655         if (il->thread)
 656                 {
 657                 /* stop loader in the other thread */
 658                 g_mutex_lock(il->data_mutex);
 659                 il->stopping = TRUE;
 660                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 661                 g_mutex_unlock(il->data_mutex);
 662                 }
 663
 664         image_loader_stop_loader(il);
 665         image_loader_stop_source(il);
 666
 667 }
 668
 669 /**************************************************************************************/
 670 /* execution via idle calls */
 671
 672 static gint image_loader_idle_cb(gpointer data)
 673 {
 674         gint ret = FALSE;
 675         ImageLoader *il = data;
 676         if (il->idle_id != -1)
 677                 {
 678                 ret = image_loader_continue(il);
 679                 }
 680         if (!ret)
 681                 {
 682                 image_loader_stop_source(il);
 683                 }
 684         return ret;
 685 }
 686
 687
 688 gint image_loader_start_idle(ImageLoader *il)
 689 {
 690         gint ret;
 691         if (!il) return FALSE;
 692
 693         if (!il->fd) return FALSE;
 694
 695         if (!image_loader_setup_source(il)) return FALSE;
 696
 697         ret = image_loader_begin(il);
 698
 699         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 700         return ret;
 701 }
 702
 703 /**************************************************************************************/
 704 /* execution via thread */
 705 static GThreadPool *image_loader_thread_pool = NULL;
 706
 707 static GCond *image_loader_prio_cond = NULL;
 708 static GMutex *image_loader_prio_mutex = NULL;
 709 static gint image_loader_prio_num = 0;
 710
 711
 712 static void image_loader_thread_enter_high()
 713 {
 714         g_mutex_lock(image_loader_prio_mutex);
 715         image_loader_prio_num++;
 716         g_mutex_unlock(image_loader_prio_mutex);
 717 }
 718
 719 static void image_loader_thread_leave_high()
 720 {
 721         g_mutex_lock(image_loader_prio_mutex);
 722         image_loader_prio_num--;
 723         if (image_loader_prio_num == 0) g_cond_signal(image_loader_prio_cond);
 724         g_mutex_unlock(image_loader_prio_mutex);
 725 }
 726
 727 static void image_loader_thread_wait_high()
 728 {
 729         g_mutex_lock(image_loader_prio_mutex);
 730         while (image_loader_prio_num)
 731                 {
 732                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 733                 }
 734
 735         g_mutex_unlock(image_loader_prio_mutex);
 736 }
 737
 738
 739 void image_loader_thread_run(gpointer data, gpointer user_data)
 740 {
 741         ImageLoader *il = data;
 742         gint cont;
 743
 744         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 745                 {
 746                 /* low prio, wait untill high prio tasks finishes */
 747                 image_loader_thread_wait_high();
 748                 }
 749         else
 750                 {
 751                 /* high prio */
 752                 image_loader_thread_enter_high();
 753                 }
 754
 755         cont = image_loader_begin(il);
 756
 757         if (!cont && !image_loader_get_pixbuf(il))
 758                 {
 759                 /*
 760                 loader failed, we have to send signal
 761                 (idle mode returns the image_loader_begin return value directly)
 762                 (success is always reported indirectly from image_loader_begin)
 763                 */
 764                 image_loader_emit_error(il);
 765                 }
 766
 767         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 768                 {
 769                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 770                         {
 771                         /* low prio, wait untill high prio tasks finishes */
 772                         image_loader_thread_wait_high();
 773                         }
 774                 cont = image_loader_continue(il);
 775                 }
 776         image_loader_stop_loader(il);
 777
 778         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 779                 {
 780                 /* high prio */
 781                 image_loader_thread_leave_high();
 782                 }
 783
 784         g_mutex_lock(il->data_mutex);
 785         il->can_destroy = TRUE;
 786         g_cond_signal(il->can_destroy_cond);
 787         g_mutex_unlock(il->data_mutex);
 788
 789 }
 790
 791
 792 gint image_loader_start_thread(ImageLoader *il)
 793 {
 794         if (!il) return FALSE;
 795
 796         if (!il->fd) return FALSE;
 797
 798         il->thread = TRUE;
 799
 800         if (!image_loader_setup_source(il)) return FALSE;
 801
 802         if (!image_loader_thread_pool)
 803                 {
 804                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 805                 image_loader_prio_cond = g_cond_new();
 806                 image_loader_prio_mutex = g_mutex_new();
 807                 }
 808
 809         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 810
 811         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 812         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 813
 814         return TRUE;
 815 }
 816
 817
 818 /**************************************************************************************/
 819 /* public interface */
 820
 821
 822 gint image_loader_start(ImageLoader *il)
 823 {
 824         if (!il) return FALSE;
 825
 826         if (!il->fd) return FALSE;
 827
 828 #ifdef HAVE_GTHREAD
 829         return image_loader_start_thread(il);
 830 #else
 831         return image_loader_start_idle(il);
 832 #endif
 833 }
 834
 835
 836 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 837 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 838 {
 839         GdkPixbuf *ret;
 840         if (!il) return NULL;
 841
 842         g_mutex_lock(il->data_mutex);
 843         ret = il->pixbuf;
 844         g_mutex_unlock(il->data_mutex);
 845         return ret;
 846 }
 847
 848 gchar *image_loader_get_format(ImageLoader *il)
 849 {
 850         GdkPixbufFormat *format;
 851         gchar **mimev;
 852         gchar *mime;
 853
 854         if (!il || !il->loader) return NULL;
 855
 856         format = gdk_pixbuf_loader_get_format(il->loader);
 857         if (!format) return NULL;
 858
 859         mimev = gdk_pixbuf_format_get_mime_types(format);
 860         if (!mimev) return NULL;
 861
 862         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 863         mime = g_strdup(mimev[0]);
 864         g_strfreev(mimev);
 865
 866         return mime;
 867 }
 868
 869 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 870 {
 871         if (!il) return;
 872
 873         g_mutex_lock(il->data_mutex);
 874         il->requested_width = width;
 875         il->requested_height = height;
 876         g_mutex_unlock(il->data_mutex);
 877 }
 878
 879 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 880 {
 881         if (!il) return;
 882
 883         g_mutex_lock(il->data_mutex);
 884         il->idle_read_loop_count = count ? count : 1;
 885         g_mutex_unlock(il->data_mutex);
 886 }
 887
 888 void image_loader_set_priority(ImageLoader *il, gint priority)
 889 {
 890         if (!il) return;
 891
 892         if (il->thread) return; /* can't change prio if the thread already runs */
 893         il->idle_priority = priority;
 894 }
 895
 896
 897 gdouble image_loader_get_percent(ImageLoader *il)
 898 {
 899         gdouble ret;
 900         if (!il) return 0.0;
 901
 902         g_mutex_lock(il->data_mutex);
 903         if (il->bytes_total == 0)
 904                 {
 905                 ret = 0.0;
 906                 }
 907         else
 908                 {
 909                 ret = (gdouble)il->bytes_read / il->bytes_total;
 910                 }
 911         g_mutex_unlock(il->data_mutex);
 912         return ret;
 913 }
 914
 915 gint image_loader_get_is_done(ImageLoader *il)
 916 {
 917         gint ret;
 918         if (!il) return FALSE;
 919
 920         g_mutex_lock(il->data_mutex);
 921         ret = il->done;
 922         g_mutex_unlock(il->data_mutex);
 923
 924         return ret;
 925 }
 926
 927 FileData *image_loader_get_fd(ImageLoader *il)
 928 {
 929         FileData *ret;
 930         if (!il) return NULL;
 931
 932         g_mutex_lock(il->data_mutex);
 933         ret = il->fd;
 934         g_mutex_unlock(il->data_mutex);
 935
 936         return ret;
 937 }
 938
 939 gint image_loader_get_shrunk(ImageLoader *il)
 940 {
 941         gint ret;
 942         if (!il) return FALSE;
 943
 944         g_mutex_lock(il->data_mutex);
 945         ret = il->shrunk;
 946         g_mutex_unlock(il->data_mutex);
 947         return ret;
 948 }
 949
 950
 951 /* FIXME - this can be rather slow and blocks until the size is known */
 952 gint image_load_dimensions(FileData *fd, gint *width, gint *height)
 953 {
 954         ImageLoader *il;
 955         gint success;
 956
 957         il = image_loader_new(fd);
 958
 959         success = image_loader_start_idle(il);
 960
 961         if (success && il->pixbuf)
 962                 {
 963                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
 964                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
 965                 }
 966         else
 967                 {
 968                 if (width) *width = -1;
 969                 if (height) *height = -1;
 970                 }
 971
 972         image_loader_free(il);
 973
 974         return success;
 975 }