src/image-load.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 - 2009 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 loader 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         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 159
 160         DEBUG_1("freeing image loader %p bytes_read=%d", il, il->bytes_read);
 161
 162         if (il->idle_done_id != -1) g_source_remove(il->idle_done_id);
 163
 164         while (g_source_remove_by_user_data(il))
 165                 {
 166                 DEBUG_2("pending signals detected");
 167                 }
 168
 169         while (il->area_param_list)
 170                 {
 171                 DEBUG_1("pending area_ready signals detected");
 172                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 173                 g_free(il->area_param_list->data);
 174                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 175                 }
 176
 177         while (il->area_param_delayed_list)
 178                 {
 179                 g_free(il->area_param_delayed_list->data);
 180                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 181                 }
 182
 183         if (il->pixbuf) g_object_unref(il->pixbuf);
 184
 185         if (il->error) g_error_free(il->error);
 186
 187         file_data_unref(il->fd);
 188 #ifdef HAVE_GTHREAD
 189         g_mutex_free(il->data_mutex);
 190         g_cond_free(il->can_destroy_cond);
 191 #endif
 192 }
 193
 194 void image_loader_free(ImageLoader *il)
 195 {
 196         if (!il) return;
 197         g_object_unref(G_OBJECT(il));
 198 }
 199
 200
 201 ImageLoader *image_loader_new(FileData *fd)
 202 {
 203         ImageLoader *il;
 204
 205         if (!fd) return NULL;
 206
 207         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 208
 209         il->fd = file_data_ref(fd);
 210
 211         return il;
 212 }
 213
 214 /**************************************************************************************/
 215 /* send signals via idle calbacks - the callback are executed in the main thread */
 216
 217 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 218 struct _ImageLoaderAreaParam {
 219         ImageLoader *il;
 220         guint x;
 221         guint y;
 222         guint w;
 223         guint h;
 224 };
 225
 226
 227 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 228 {
 229         ImageLoaderAreaParam *par = data;
 230         ImageLoader *il = par->il;
 231         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 232         g_mutex_lock(il->data_mutex);
 233         il->area_param_list = g_list_remove(il->area_param_list, par);
 234         g_free(par);
 235         g_mutex_unlock(il->data_mutex);
 236
 237         return FALSE;
 238 }
 239
 240 static gboolean image_loader_emit_done_cb(gpointer data)
 241 {
 242         ImageLoader *il = data;
 243         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 244         return FALSE;
 245 }
 246
 247 static gboolean image_loader_emit_error_cb(gpointer data)
 248 {
 249         ImageLoader *il = data;
 250         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 251         return FALSE;
 252 }
 253
 254 static gboolean image_loader_emit_percent_cb(gpointer data)
 255 {
 256         ImageLoader *il = data;
 257         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 258         return FALSE;
 259 }
 260
 261 /* DONE and ERROR are emited only once, thus they can have normal priority
 262    PERCENT and AREA_READY should be processed ASAP
 263 */
 264
 265 static void image_loader_emit_done(ImageLoader *il)
 266 {
 267         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 268 }
 269
 270 static void image_loader_emit_error(ImageLoader *il)
 271 {
 272         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 273 }
 274
 275 static void image_loader_emit_percent(ImageLoader *il)
 276 {
 277         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 278 }
 279
 280 /* this function expects that il->data_mutex is locked by caller */
 281 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 282 {
 283         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 284         par->il = il;
 285         par->x = x;
 286         par->y = y;
 287         par->w = w;
 288         par->h = h;
 289
 290         il->area_param_list = g_list_prepend(il->area_param_list, par);
 291
 292         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 293 }
 294
 295 /**************************************************************************************/
 296 /* the following functions may be executed in separate thread */
 297
 298 /* this function expects that il->data_mutex is locked by caller */
 299 static void image_loader_queue_delayed_erea_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 300 {
 301         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 302         par->il = il;
 303         par->x = x;
 304         par->y = y;
 305         par->w = w;
 306         par->h = h;
 307
 308         il->area_param_delayed_list = g_list_prepend(il->area_param_delayed_list, par);
 309 }
 310
 311
 312
 313 static gboolean image_loader_get_stopping(ImageLoader *il)
 314 {
 315         gboolean ret;
 316         if (!il) return FALSE;
 317
 318         g_mutex_lock(il->data_mutex);
 319         ret = il->stopping;
 320         g_mutex_unlock(il->data_mutex);
 321
 322         return ret;
 323 }
 324
 325
 326 static void image_loader_sync_pixbuf(ImageLoader *il)
 327 {
 328         GdkPixbuf *pb;
 329
 330         g_mutex_lock(il->data_mutex);
 331
 332         if (!il->loader)
 333                 {
 334                 g_mutex_unlock(il->data_mutex);
 335                 return;
 336                 }
 337
 338         pb = gdk_pixbuf_loader_get_pixbuf(il->loader);
 339
 340         if (pb == il->pixbuf)
 341                 {
 342                 g_mutex_unlock(il->data_mutex);
 343                 return;
 344                 }
 345
 346         if (il->pixbuf) g_object_unref(il->pixbuf);
 347
 348         il->pixbuf = pb;
 349         if (il->pixbuf) g_object_ref(il->pixbuf);
 350
 351         g_mutex_unlock(il->data_mutex);
 352 }
 353
 354 static void image_loader_area_updated_cb(GdkPixbufLoader *loader,
 355                                  guint x, guint y, guint w, guint h,
 356                                  gpointer data)
 357 {
 358         ImageLoader *il = data;
 359
 360         if (!image_loader_get_pixbuf(il))
 361                 {
 362                 image_loader_sync_pixbuf(il);
 363                 if (!image_loader_get_pixbuf(il))
 364                         {
 365                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 366                         }
 367                 }
 368
 369         g_mutex_lock(il->data_mutex);
 370         if (il->delay_area_ready)
 371                 image_loader_queue_delayed_erea_ready(il, x, y, w, h);
 372         else
 373                 image_loader_emit_area_ready(il, x, y, w, h);
 374         g_mutex_unlock(il->data_mutex);
 375 }
 376
 377 static void image_loader_area_prepared_cb(GdkPixbufLoader *loader, gpointer data)
 378 {
 379         GdkPixbuf *pb;
 380         guchar *pix;
 381         size_t h, rs;
 382
 383         /* a workaround for http://bugzilla.gnome.org/show_bug.cgi?id=547669 */
 384         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 385         if (strcmp(format, "svg") == 0)
 386                 {
 387                 g_free(format);
 388                 return;
 389                 }
 390
 391         g_free(format);
 392
 393         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 394
 395         h = gdk_pixbuf_get_height(pb);
 396         rs = gdk_pixbuf_get_rowstride(pb);
 397         pix = gdk_pixbuf_get_pixels(pb);
 398
 399         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 400
 401 }
 402
 403 static void image_loader_size_cb(GdkPixbufLoader *loader,
 404                                  gint width, gint height, gpointer data)
 405 {
 406         ImageLoader *il = data;
 407         GdkPixbufFormat *format;
 408         gchar **mime_types;
 409         gboolean scale = FALSE;
 410         gint n;
 411
 412         g_mutex_lock(il->data_mutex);
 413         if (il->requested_width < 1 || il->requested_height < 1)
 414                 {
 415                 g_mutex_unlock(il->data_mutex);
 416                 return;
 417                 }
 418         g_mutex_unlock(il->data_mutex);
 419
 420         format = gdk_pixbuf_loader_get_format(loader);
 421         if (!format) return;
 422
 423         mime_types = gdk_pixbuf_format_get_mime_types(format);
 424         n = 0;
 425         while (mime_types[n])
 426                 {
 427                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 428                 n++;
 429                 }
 430         g_strfreev(mime_types);
 431
 432         if (!scale) return;
 433
 434         g_mutex_lock(il->data_mutex);
 435
 436         if (width > il->requested_width || height > il->requested_height)
 437                 {
 438                 gint nw, nh;
 439
 440                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 441                         {
 442                         nw = il->requested_width;
 443                         nh = (gdouble)nw / width * height;
 444                         if (nh < 1) nh = 1;
 445                         }
 446                 else
 447                         {
 448                         nh = il->requested_height;
 449                         nw = (gdouble)nh / height * width;
 450                         if (nw < 1) nw = 1;
 451                         }
 452
 453                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 454                 il->shrunk = TRUE;
 455                 }
 456         g_mutex_unlock(il->data_mutex);
 457
 458 }
 459
 460 static void image_loader_stop_loader(ImageLoader *il)
 461 {
 462         if (!il) return;
 463
 464         if (il->loader)
 465                 {
 466                 /* some loaders do not have a pixbuf till close, order is important here */
 467                 gdk_pixbuf_loader_close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 468                 image_loader_sync_pixbuf(il);
 469                 g_object_unref(G_OBJECT(il->loader));
 470                 il->loader = NULL;
 471                 }
 472         g_mutex_lock(il->data_mutex);
 473         il->done = TRUE;
 474         g_mutex_unlock(il->data_mutex);
 475 }
 476
 477 static void image_loader_setup_loader(ImageLoader *il)
 478 {
 479         g_mutex_lock(il->data_mutex);
 480         il->loader = gdk_pixbuf_loader_new();
 481
 482         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 483                          G_CALLBACK(image_loader_area_updated_cb), il);
 484         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 485                          G_CALLBACK(image_loader_size_cb), il);
 486         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 487                          G_CALLBACK(image_loader_area_prepared_cb), il);
 488         g_mutex_unlock(il->data_mutex);
 489 }
 490
 491
 492 static void image_loader_done(ImageLoader *il)
 493 {
 494         image_loader_stop_loader(il);
 495
 496         image_loader_emit_done(il);
 497 }
 498
 499 static void image_loader_error(ImageLoader *il)
 500 {
 501         image_loader_stop_loader(il);
 502
 503         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 504
 505         image_loader_emit_error(il);
 506 }
 507
 508 static gboolean image_loader_continue(ImageLoader *il)
 509 {
 510         gint b;
 511         gint c;
 512
 513         if (!il) return FALSE;
 514
 515         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 516         while (c > 0 && !image_loader_get_stopping(il))
 517                 {
 518                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 519
 520                 if (b == 0)
 521                         {
 522                         image_loader_done(il);
 523                         return FALSE;
 524                         }
 525
 526                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 527                         {
 528                         image_loader_error(il);
 529                         return FALSE;
 530                         }
 531
 532                 il->bytes_read += b;
 533
 534                 c--;
 535                 }
 536
 537         if (il->bytes_total > 0)
 538                 {
 539                 image_loader_emit_percent(il);
 540                 }
 541
 542         return TRUE;
 543 }
 544
 545 static gboolean image_loader_begin(ImageLoader *il)
 546 {
 547         gssize b;
 548
 549         if (il->pixbuf) return FALSE;
 550
 551         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 552         if (b < 1) return FALSE;
 553
 554         image_loader_setup_loader(il);
 555
 556         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error))
 557                 {
 558                 image_loader_stop_loader(il);
 559                 return FALSE;
 560                 }
 561
 562         il->bytes_read += b;
 563
 564         /* read until size is known */
 565         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 566                 {
 567                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 568                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 569                         {
 570                         image_loader_stop_loader(il);
 571                         return FALSE;
 572                         }
 573                 il->bytes_read += b;
 574                 }
 575         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 576
 577         if (il->bytes_read == il->bytes_total || b < 1)
 578                 {
 579                 /* done, handle (broken) loaders that do not have pixbuf till close */
 580                 image_loader_stop_loader(il);
 581
 582                 if (!il->pixbuf) return FALSE;
 583
 584                 image_loader_done(il);
 585                 return TRUE;
 586                 }
 587
 588         if (!il->pixbuf)
 589                 {
 590                 image_loader_stop_loader(il);
 591                 return FALSE;
 592                 }
 593
 594         return TRUE;
 595 }
 596
 597 /**************************************************************************************/
 598 /* the following functions are always executed in the main thread */
 599
 600
 601 static gboolean image_loader_setup_source(ImageLoader *il)
 602 {
 603         struct stat st;
 604         gchar *pathl;
 605
 606         if (!il || il->loader || il->mapped_file) return FALSE;
 607
 608         il->mapped_file = NULL;
 609
 610         if (il->fd)
 611                 {
 612                 ExifData *exif = exif_read_fd(il->fd);
 613
 614                 if (options->thumbnails.use_exif)
 615                         il->mapped_file = exif_get_preview(exif, &il->bytes_total, il->requested_width, il->requested_height);
 616                 else
 617                         il->mapped_file = exif_get_preview(exif, &il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 618
 619                 if (il->mapped_file)
 620                         {
 621                         il->preview = TRUE;
 622                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 623                         }
 624                 exif_free_fd(il->fd, exif);
 625                 }
 626
 627
 628         if (!il->mapped_file)
 629                 {
 630                 /* normal file */
 631                 gint load_fd;
 632
 633                 pathl = path_from_utf8(il->fd->path);
 634                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 635                 g_free(pathl);
 636                 if (load_fd == -1) return FALSE;
 637
 638                 if (fstat(load_fd, &st) == 0)
 639                         {
 640                         il->bytes_total = st.st_size;
 641                         }
 642                 else
 643                         {
 644                         close(load_fd);
 645                         return FALSE;
 646                         }
 647
 648                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 649                 close(load_fd);
 650                 if (il->mapped_file == MAP_FAILED)
 651                         {
 652                         il->mapped_file = 0;
 653                         return FALSE;
 654                         }
 655                 il->preview = FALSE;
 656                 }
 657
 658         return TRUE;
 659 }
 660
 661 static void image_loader_stop_source(ImageLoader *il)
 662 {
 663         if (!il) return;
 664
 665         if (il->mapped_file)
 666                 {
 667                 if (il->preview)
 668                         {
 669                         exif_free_preview(il->mapped_file);
 670                         }
 671                 else
 672                         {
 673                         munmap(il->mapped_file, il->bytes_total);
 674                         }
 675                 il->mapped_file = NULL;
 676                 }
 677 }
 678
 679 static void image_loader_stop(ImageLoader *il)
 680 {
 681         if (!il) return;
 682
 683         if (il->idle_id != -1)
 684                 {
 685                 g_source_remove(il->idle_id);
 686                 il->idle_id = -1;
 687                 }
 688
 689         if (il->thread)
 690                 {
 691                 /* stop loader in the other thread */
 692                 g_mutex_lock(il->data_mutex);
 693                 il->stopping = TRUE;
 694                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 695                 g_mutex_unlock(il->data_mutex);
 696                 }
 697
 698         image_loader_stop_loader(il);
 699         image_loader_stop_source(il);
 700
 701 }
 702
 703 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
 704 {
 705         g_mutex_lock(il->data_mutex);
 706         il->delay_area_ready = enable;
 707         if (!enable)
 708                 {
 709                 /* send delayed */
 710                 GList *list, *work;
 711                 list = g_list_reverse(il->area_param_delayed_list);
 712                 il->area_param_delayed_list = NULL;
 713                 g_mutex_unlock(il->data_mutex);
 714
 715                 work = list;
 716
 717                 while (work)
 718                         {
 719                         ImageLoaderAreaParam *par = work->data;
 720                         work = work->next;
 721
 722                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 723                         g_free(par);
 724                         }
 725                 g_list_free(list);
 726                 }
 727         else
 728                 {
 729                 /* just unlock */
 730                 g_mutex_unlock(il->data_mutex);
 731                 }
 732 }
 733
 734
 735 /**************************************************************************************/
 736 /* execution via idle calls */
 737
 738 static gboolean image_loader_idle_cb(gpointer data)
 739 {
 740         gboolean ret = FALSE;
 741         ImageLoader *il = data;
 742
 743         if (il->idle_id != -1)
 744                 {
 745                 ret = image_loader_continue(il);
 746                 }
 747
 748         if (!ret)
 749                 {
 750                 image_loader_stop_source(il);
 751                 }
 752
 753         return ret;
 754 }
 755
 756
 757 static gboolean image_loader_start_idle(ImageLoader *il)
 758 {
 759         gboolean ret;
 760
 761         if (!il) return FALSE;
 762
 763         if (!il->fd) return FALSE;
 764
 765         if (!image_loader_setup_source(il)) return FALSE;
 766
 767         ret = image_loader_begin(il);
 768
 769         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 770         return ret;
 771 }
 772
 773 /**************************************************************************************/
 774 /* execution via thread */
 775 static GThreadPool *image_loader_thread_pool = NULL;
 776
 777 static GCond *image_loader_prio_cond = NULL;
 778 static GMutex *image_loader_prio_mutex = NULL;
 779 static gint image_loader_prio_num = 0;
 780
 781
 782 static void image_loader_thread_enter_high(void)
 783 {
 784         g_mutex_lock(image_loader_prio_mutex);
 785         image_loader_prio_num++;
 786         g_mutex_unlock(image_loader_prio_mutex);
 787 }
 788
 789 static void image_loader_thread_leave_high(void)
 790 {
 791         g_mutex_lock(image_loader_prio_mutex);
 792         image_loader_prio_num--;
 793         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
 794         g_mutex_unlock(image_loader_prio_mutex);
 795 }
 796
 797 static void image_loader_thread_wait_high(void)
 798 {
 799         g_mutex_lock(image_loader_prio_mutex);
 800         while (image_loader_prio_num)
 801                 {
 802                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 803                 }
 804
 805         g_mutex_unlock(image_loader_prio_mutex);
 806 }
 807
 808
 809 static void image_loader_thread_run(gpointer data, gpointer user_data)
 810 {
 811         ImageLoader *il = data;
 812         gboolean cont;
 813
 814         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 815                 {
 816                 /* low prio, wait untill high prio tasks finishes */
 817                 image_loader_thread_wait_high();
 818                 }
 819         else
 820                 {
 821                 /* high prio */
 822                 image_loader_thread_enter_high();
 823                 }
 824
 825         cont = image_loader_begin(il);
 826
 827         if (!cont && !image_loader_get_pixbuf(il))
 828                 {
 829                 /*
 830                 loader failed, we have to send signal
 831                 (idle mode returns the image_loader_begin return value directly)
 832                 (success is always reported indirectly from image_loader_begin)
 833                 */
 834                 image_loader_emit_error(il);
 835                 }
 836
 837         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 838                 {
 839                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 840                         {
 841                         /* low prio, wait untill high prio tasks finishes */
 842                         image_loader_thread_wait_high();
 843                         }
 844                 cont = image_loader_continue(il);
 845                 }
 846         image_loader_stop_loader(il);
 847
 848         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 849                 {
 850                 /* high prio */
 851                 image_loader_thread_leave_high();
 852                 }
 853
 854         g_mutex_lock(il->data_mutex);
 855         il->can_destroy = TRUE;
 856         g_cond_signal(il->can_destroy_cond);
 857         g_mutex_unlock(il->data_mutex);
 858
 859 }
 860
 861
 862 static gboolean image_loader_start_thread(ImageLoader *il)
 863 {
 864         if (!il) return FALSE;
 865
 866         if (!il->fd) return FALSE;
 867
 868         il->thread = TRUE;
 869
 870         if (!image_loader_setup_source(il)) return FALSE;
 871
 872         if (!image_loader_thread_pool)
 873                 {
 874                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 875                 image_loader_prio_cond = g_cond_new();
 876                 image_loader_prio_mutex = g_mutex_new();
 877                 }
 878
 879         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 880
 881         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 882         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 883
 884         return TRUE;
 885 }
 886
 887
 888 /**************************************************************************************/
 889 /* public interface */
 890
 891
 892 gboolean image_loader_start(ImageLoader *il)
 893 {
 894         if (!il) return FALSE;
 895
 896         if (!il->fd) return FALSE;
 897
 898 #ifdef HAVE_GTHREAD
 899         return image_loader_start_thread(il);
 900 #else
 901         return image_loader_start_idle(il);
 902 #endif
 903 }
 904
 905
 906 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 907 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 908 {
 909         GdkPixbuf *ret;
 910         if (!il) return NULL;
 911
 912         g_mutex_lock(il->data_mutex);
 913         ret = il->pixbuf;
 914         g_mutex_unlock(il->data_mutex);
 915         return ret;
 916 }
 917
 918 gchar *image_loader_get_format(ImageLoader *il)
 919 {
 920         GdkPixbufFormat *format;
 921         gchar **mimev;
 922         gchar *mime;
 923
 924         if (!il || !il->loader) return NULL;
 925
 926         format = gdk_pixbuf_loader_get_format(il->loader);
 927         if (!format) return NULL;
 928
 929         mimev = gdk_pixbuf_format_get_mime_types(format);
 930         if (!mimev) return NULL;
 931
 932         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 933         mime = g_strdup(mimev[0]);
 934         g_strfreev(mimev);
 935
 936         return mime;
 937 }
 938
 939 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 940 {
 941         if (!il) return;
 942
 943         g_mutex_lock(il->data_mutex);
 944         il->requested_width = width;
 945         il->requested_height = height;
 946         g_mutex_unlock(il->data_mutex);
 947 }
 948
 949 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 950 {
 951         if (!il) return;
 952
 953         g_mutex_lock(il->data_mutex);
 954         il->idle_read_loop_count = count ? count : 1;
 955         g_mutex_unlock(il->data_mutex);
 956 }
 957
 958 void image_loader_set_priority(ImageLoader *il, gint priority)
 959 {
 960         if (!il) return;
 961
 962         if (il->thread) return; /* can't change prio if the thread already runs */
 963         il->idle_priority = priority;
 964 }
 965
 966
 967 gdouble image_loader_get_percent(ImageLoader *il)
 968 {
 969         gdouble ret;
 970         if (!il) return 0.0;
 971
 972         g_mutex_lock(il->data_mutex);
 973         if (il->bytes_total == 0)
 974                 {
 975                 ret = 0.0;
 976                 }
 977         else
 978                 {
 979                 ret = (gdouble)il->bytes_read / il->bytes_total;
 980                 }
 981         g_mutex_unlock(il->data_mutex);
 982         return ret;
 983 }
 984
 985 gboolean image_loader_get_is_done(ImageLoader *il)
 986 {
 987         gboolean ret;
 988         if (!il) return FALSE;
 989
 990         g_mutex_lock(il->data_mutex);
 991         ret = il->done;
 992         g_mutex_unlock(il->data_mutex);
 993
 994         return ret;
 995 }
 996
 997 FileData *image_loader_get_fd(ImageLoader *il)
 998 {
 999         FileData *ret;
1000         if (!il) return NULL;
1001
1002         g_mutex_lock(il->data_mutex);
1003         ret = il->fd;
1004         g_mutex_unlock(il->data_mutex);
1005
1006         return ret;
1007 }
1008
1009 gboolean image_loader_get_shrunk(ImageLoader *il)
1010 {
1011         gboolean ret;
1012         if (!il) return FALSE;
1013
1014         g_mutex_lock(il->data_mutex);
1015         ret = il->shrunk;
1016         g_mutex_unlock(il->data_mutex);
1017         return ret;
1018 }
1019
1020 const gchar *image_loader_get_error(ImageLoader *il)
1021 {
1022         const gchar *ret = NULL;
1023         if (!il) return NULL;
1024         g_mutex_lock(il->data_mutex);
1025         if (il->error) ret = il->error->message;
1026         g_mutex_unlock(il->data_mutex);
1027         return ret;
1028 }
1029
1030
1031 /* FIXME - this can be rather slow and blocks until the size is known */
1032 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1033 {
1034         ImageLoader *il;
1035         gboolean success;
1036
1037         il = image_loader_new(fd);
1038
1039         success = image_loader_start_idle(il);
1040
1041         if (success && il->pixbuf)
1042                 {
1043                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1044                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1045                 }
1046         else
1047                 {
1048                 if (width) *width = -1;
1049                 if (height) *height = -1;
1050                 }
1051
1052         image_loader_free(il);
1053
1054         return success;
1055 }
1056 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */