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 #define IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT   4096
  26 #define IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT       1
  27
  28
  29 /**************************************************************************************/
  30 /* image loader class */
  31
  32
  33 enum {
  34         SIGNAL_AREA_READY = 0,
  35         SIGNAL_ERROR,
  36         SIGNAL_DONE,
  37         SIGNAL_PERCENT,
  38         SIGNAL_COUNT
  39 };
  40
  41 static guint signals[SIGNAL_COUNT] = { 0 };
  42
  43 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
  44 static void image_loader_class_init(ImageLoaderClass *class);
  45 static void image_loader_finalize(GObject *object);
  46 static void image_loader_stop(ImageLoader *il);
  47
  48 GType image_loader_get_type(void)
  49 {
  50         static GType type = 0;
  51         if (type == 0)
  52                 {
  53                 static const GTypeInfo info = {
  54                         sizeof(ImageLoaderClass),
  55                         NULL,   /* base_init */
  56                         NULL,   /* base_finalize */
  57                         (GClassInitFunc)image_loader_class_init, /* class_init */
  58                         NULL,   /* class_finalize */
  59                         NULL,   /* class_data */
  60                         sizeof(ImageLoader),
  61                         0,      /* n_preallocs */
  62                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  63                         NULL    /* value_table */
  64                         };
  65                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  66                 }
  67         return type;
  68 }
  69
  70 static void image_loader_init(GTypeInstance *instance, gpointer g_class)
  71 {
  72         ImageLoader *il = (ImageLoader *)instance;
  73
  74         il->pixbuf = NULL;
  75         il->idle_id = 0;
  76         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  77         il->done = FALSE;
  78         il->loader = NULL;
  79
  80         il->bytes_read = 0;
  81         il->bytes_total = 0;
  82
  83         il->idle_done_id = 0;
  84
  85         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
  86         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
  87         il->mapped_file = NULL;
  88
  89         il->requested_width = 0;
  90         il->requested_height = 0;
  91         il->shrunk = FALSE;
  92
  93         il->can_destroy = TRUE;
  94
  95 #ifdef HAVE_GTHREAD
  96         il->data_mutex = g_mutex_new();
  97         il->can_destroy_cond = g_cond_new();
  98 #endif
  99         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
 100 }
 101
 102 static void image_loader_class_init(ImageLoaderClass *class)
 103 {
 104         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 105
 106 //      gobject_class->set_property = image_loader_set_property;
 107 //      gobject_class->get_property = image_loader_get_property;
 108
 109         gobject_class->finalize = image_loader_finalize;
 110
 111
 112         signals[SIGNAL_AREA_READY] =
 113                 g_signal_new("area_ready",
 114                              G_OBJECT_CLASS_TYPE(gobject_class),
 115                              G_SIGNAL_RUN_LAST,
 116                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 117                              NULL, NULL,
 118                              gq_marshal_VOID__INT_INT_INT_INT,
 119                              G_TYPE_NONE, 4,
 120                              G_TYPE_INT,
 121                              G_TYPE_INT,
 122                              G_TYPE_INT,
 123                              G_TYPE_INT);
 124
 125         signals[SIGNAL_ERROR] =
 126                 g_signal_new("error",
 127                              G_OBJECT_CLASS_TYPE(gobject_class),
 128                              G_SIGNAL_RUN_LAST,
 129                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 130                              NULL, NULL,
 131                              g_cclosure_marshal_VOID__VOID,
 132                              G_TYPE_NONE, 0);
 133
 134         signals[SIGNAL_DONE] =
 135                 g_signal_new("done",
 136                              G_OBJECT_CLASS_TYPE(gobject_class),
 137                              G_SIGNAL_RUN_LAST,
 138                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 139                              NULL, NULL,
 140                              g_cclosure_marshal_VOID__VOID,
 141                              G_TYPE_NONE, 0);
 142
 143         signals[SIGNAL_PERCENT] =
 144                 g_signal_new("percent",
 145                              G_OBJECT_CLASS_TYPE(gobject_class),
 146                              G_SIGNAL_RUN_LAST,
 147                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 148                              NULL, NULL,
 149                              g_cclosure_marshal_VOID__DOUBLE,
 150                              G_TYPE_NONE, 1,
 151                              G_TYPE_DOUBLE);
 152
 153 }
 154
 155 static void image_loader_finalize(GObject *object)
 156 {
 157         ImageLoader *il = (ImageLoader *)object;
 158
 159         image_loader_stop(il);
 160
 161         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 162
 163         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, il, il->bytes_read);
 164
 165         if (il->idle_done_id)
 166                 {
 167                 g_source_remove(il->idle_done_id);
 168                 il->idle_done_id = 0;
 169                 }
 170
 171         while (g_source_remove_by_user_data(il))
 172                 {
 173                 DEBUG_2("pending signals detected");
 174                 }
 175
 176         while (il->area_param_list)
 177                 {
 178                 DEBUG_1("pending area_ready signals detected");
 179                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 180                 g_free(il->area_param_list->data);
 181                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 182                 }
 183
 184         while (il->area_param_delayed_list)
 185                 {
 186                 g_free(il->area_param_delayed_list->data);
 187                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 188                 }
 189
 190         if (il->pixbuf) g_object_unref(il->pixbuf);
 191
 192         if (il->error) g_error_free(il->error);
 193
 194         file_data_unref(il->fd);
 195 #ifdef HAVE_GTHREAD
 196         g_mutex_free(il->data_mutex);
 197         g_cond_free(il->can_destroy_cond);
 198 #endif
 199 }
 200
 201 void image_loader_free(ImageLoader *il)
 202 {
 203         if (!il) return;
 204         g_object_unref(G_OBJECT(il));
 205 }
 206
 207
 208 ImageLoader *image_loader_new(FileData *fd)
 209 {
 210         ImageLoader *il;
 211
 212         if (!fd) return NULL;
 213
 214         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 215
 216         il->fd = file_data_ref(fd);
 217
 218         return il;
 219 }
 220
 221 /**************************************************************************************/
 222 /* send signals via idle calbacks - the callback are executed in the main thread */
 223
 224 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 225 struct _ImageLoaderAreaParam {
 226         ImageLoader *il;
 227         guint x;
 228         guint y;
 229         guint w;
 230         guint h;
 231 };
 232
 233
 234 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 235 {
 236         ImageLoaderAreaParam *par = data;
 237         ImageLoader *il = par->il;
 238         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 239         g_mutex_lock(il->data_mutex);
 240         il->area_param_list = g_list_remove(il->area_param_list, par);
 241         g_free(par);
 242         g_mutex_unlock(il->data_mutex);
 243
 244         return FALSE;
 245 }
 246
 247 static gboolean image_loader_emit_done_cb(gpointer data)
 248 {
 249         ImageLoader *il = data;
 250         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 251         return FALSE;
 252 }
 253
 254 static gboolean image_loader_emit_error_cb(gpointer data)
 255 {
 256         ImageLoader *il = data;
 257         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 258         return FALSE;
 259 }
 260
 261 static gboolean image_loader_emit_percent_cb(gpointer data)
 262 {
 263         ImageLoader *il = data;
 264         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 265         return FALSE;
 266 }
 267
 268 /* DONE and ERROR are emited only once, thus they can have normal priority
 269    PERCENT and AREA_READY should be processed ASAP
 270 */
 271
 272 static void image_loader_emit_done(ImageLoader *il)
 273 {
 274         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 275 }
 276
 277 static void image_loader_emit_error(ImageLoader *il)
 278 {
 279         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 280 }
 281
 282 static void image_loader_emit_percent(ImageLoader *il)
 283 {
 284         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 285 }
 286
 287 /* this function expects that il->data_mutex is locked by caller */
 288 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 289 {
 290         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 291         par->il = il;
 292         par->x = x;
 293         par->y = y;
 294         par->w = w;
 295         par->h = h;
 296
 297         il->area_param_list = g_list_prepend(il->area_param_list, par);
 298
 299         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 300 }
 301
 302 /**************************************************************************************/
 303 /* the following functions may be executed in separate thread */
 304
 305 /* this function expects that il->data_mutex is locked by caller */
 306 static void image_loader_queue_delayed_erea_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 307 {
 308         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 309         par->il = il;
 310         par->x = x;
 311         par->y = y;
 312         par->w = w;
 313         par->h = h;
 314
 315         il->area_param_delayed_list = g_list_prepend(il->area_param_delayed_list, par);
 316 }
 317
 318
 319
 320 static gboolean image_loader_get_stopping(ImageLoader *il)
 321 {
 322         gboolean ret;
 323         if (!il) return FALSE;
 324
 325         g_mutex_lock(il->data_mutex);
 326         ret = il->stopping;
 327         g_mutex_unlock(il->data_mutex);
 328
 329         return ret;
 330 }
 331
 332
 333 static void image_loader_sync_pixbuf(ImageLoader *il)
 334 {
 335         GdkPixbuf *pb;
 336
 337         g_mutex_lock(il->data_mutex);
 338
 339         if (!il->loader)
 340                 {
 341                 g_mutex_unlock(il->data_mutex);
 342                 return;
 343                 }
 344
 345         pb = gdk_pixbuf_loader_get_pixbuf(il->loader);
 346
 347         if (pb == il->pixbuf)
 348                 {
 349                 g_mutex_unlock(il->data_mutex);
 350                 return;
 351                 }
 352
 353         if (il->pixbuf) g_object_unref(il->pixbuf);
 354
 355         il->pixbuf = pb;
 356         if (il->pixbuf) g_object_ref(il->pixbuf);
 357
 358         g_mutex_unlock(il->data_mutex);
 359 }
 360
 361 static void image_loader_area_updated_cb(GdkPixbufLoader *loader,
 362                                  guint x, guint y, guint w, guint h,
 363                                  gpointer data)
 364 {
 365         ImageLoader *il = data;
 366
 367         if (!image_loader_get_pixbuf(il))
 368                 {
 369                 image_loader_sync_pixbuf(il);
 370                 if (!image_loader_get_pixbuf(il))
 371                         {
 372                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 373                         }
 374                 }
 375
 376         g_mutex_lock(il->data_mutex);
 377         if (il->delay_area_ready)
 378                 image_loader_queue_delayed_erea_ready(il, x, y, w, h);
 379         else
 380                 image_loader_emit_area_ready(il, x, y, w, h);
 381         g_mutex_unlock(il->data_mutex);
 382 }
 383
 384 static void image_loader_area_prepared_cb(GdkPixbufLoader *loader, gpointer data)
 385 {
 386         GdkPixbuf *pb;
 387         guchar *pix;
 388         size_t h, rs;
 389
 390         /* a workaround for http://bugzilla.gnome.org/show_bug.cgi?id=547669 */
 391         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 392         if (strcmp(format, "svg") == 0)
 393                 {
 394                 g_free(format);
 395                 return;
 396                 }
 397
 398         g_free(format);
 399
 400         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 401
 402         h = gdk_pixbuf_get_height(pb);
 403         rs = gdk_pixbuf_get_rowstride(pb);
 404         pix = gdk_pixbuf_get_pixels(pb);
 405
 406         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 407
 408 }
 409
 410 static void image_loader_size_cb(GdkPixbufLoader *loader,
 411                                  gint width, gint height, gpointer data)
 412 {
 413         ImageLoader *il = data;
 414         GdkPixbufFormat *format;
 415         gchar **mime_types;
 416         gboolean scale = FALSE;
 417         gint n;
 418
 419         g_mutex_lock(il->data_mutex);
 420         if (il->requested_width < 1 || il->requested_height < 1)
 421                 {
 422                 g_mutex_unlock(il->data_mutex);
 423                 return;
 424                 }
 425         g_mutex_unlock(il->data_mutex);
 426
 427         format = gdk_pixbuf_loader_get_format(loader);
 428         if (!format) return;
 429
 430         mime_types = gdk_pixbuf_format_get_mime_types(format);
 431         n = 0;
 432         while (mime_types[n])
 433                 {
 434                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 435                 n++;
 436                 }
 437         g_strfreev(mime_types);
 438
 439         if (!scale) return;
 440
 441         g_mutex_lock(il->data_mutex);
 442
 443         if (width > il->requested_width || height > il->requested_height)
 444                 {
 445                 gint nw, nh;
 446
 447                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 448                         {
 449                         nw = il->requested_width;
 450                         nh = (gdouble)nw / width * height;
 451                         if (nh < 1) nh = 1;
 452                         }
 453                 else
 454                         {
 455                         nh = il->requested_height;
 456                         nw = (gdouble)nh / height * width;
 457                         if (nw < 1) nw = 1;
 458                         }
 459
 460                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 461                 il->shrunk = TRUE;
 462                 }
 463         g_mutex_unlock(il->data_mutex);
 464
 465 }
 466
 467 static void image_loader_stop_loader(ImageLoader *il)
 468 {
 469         if (!il) return;
 470
 471         if (il->loader)
 472                 {
 473                 /* some loaders do not have a pixbuf till close, order is important here */
 474                 gdk_pixbuf_loader_close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 475                 image_loader_sync_pixbuf(il);
 476                 g_object_unref(G_OBJECT(il->loader));
 477                 il->loader = NULL;
 478                 }
 479         g_mutex_lock(il->data_mutex);
 480         il->done = TRUE;
 481         g_mutex_unlock(il->data_mutex);
 482 }
 483
 484 static void image_loader_setup_loader(ImageLoader *il)
 485 {
 486         g_mutex_lock(il->data_mutex);
 487         il->loader = gdk_pixbuf_loader_new();
 488
 489         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 490                          G_CALLBACK(image_loader_area_updated_cb), il);
 491         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 492                          G_CALLBACK(image_loader_size_cb), il);
 493         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 494                          G_CALLBACK(image_loader_area_prepared_cb), il);
 495         g_mutex_unlock(il->data_mutex);
 496 }
 497
 498
 499 static void image_loader_done(ImageLoader *il)
 500 {
 501         image_loader_stop_loader(il);
 502
 503         image_loader_emit_done(il);
 504 }
 505
 506 static void image_loader_error(ImageLoader *il)
 507 {
 508         image_loader_stop_loader(il);
 509
 510         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 511
 512         image_loader_emit_error(il);
 513 }
 514
 515 static gboolean image_loader_continue(ImageLoader *il)
 516 {
 517         gint b;
 518         gint c;
 519
 520         if (!il) return FALSE;
 521
 522         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 523         while (c > 0 && !image_loader_get_stopping(il))
 524                 {
 525                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 526
 527                 if (b == 0)
 528                         {
 529                         image_loader_done(il);
 530                         return FALSE;
 531                         }
 532
 533                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 534                         {
 535                         image_loader_error(il);
 536                         return FALSE;
 537                         }
 538
 539                 il->bytes_read += b;
 540
 541                 c--;
 542                 }
 543
 544         if (il->bytes_total > 0)
 545                 {
 546                 image_loader_emit_percent(il);
 547                 }
 548
 549         return TRUE;
 550 }
 551
 552 static gboolean image_loader_begin(ImageLoader *il)
 553 {
 554         gssize b;
 555
 556         if (il->pixbuf) return FALSE;
 557
 558         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 559         if (b < 1) return FALSE;
 560
 561         image_loader_setup_loader(il);
 562
 563         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error))
 564                 {
 565                 image_loader_stop_loader(il);
 566                 return FALSE;
 567                 }
 568
 569         il->bytes_read += b;
 570
 571         /* read until size is known */
 572         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 573                 {
 574                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 575                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 576                         {
 577                         image_loader_stop_loader(il);
 578                         return FALSE;
 579                         }
 580                 il->bytes_read += b;
 581                 }
 582         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 583
 584         if (il->bytes_read == il->bytes_total || b < 1)
 585                 {
 586                 /* done, handle (broken) loaders that do not have pixbuf till close */
 587                 image_loader_stop_loader(il);
 588
 589                 if (!il->pixbuf) return FALSE;
 590
 591                 image_loader_done(il);
 592                 return TRUE;
 593                 }
 594
 595         if (!il->pixbuf)
 596                 {
 597                 image_loader_stop_loader(il);
 598                 return FALSE;
 599                 }
 600
 601         return TRUE;
 602 }
 603
 604 /**************************************************************************************/
 605 /* the following functions are always executed in the main thread */
 606
 607
 608 static gboolean image_loader_setup_source(ImageLoader *il)
 609 {
 610         struct stat st;
 611         gchar *pathl;
 612
 613         if (!il || il->loader || il->mapped_file) return FALSE;
 614
 615         il->mapped_file = NULL;
 616
 617         if (il->fd)
 618                 {
 619                 ExifData *exif = exif_read_fd(il->fd);
 620
 621                 if (options->thumbnails.use_exif)
 622                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, il->requested_width, il->requested_height);
 623                 else
 624                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 625
 626                 if (il->mapped_file)
 627                         {
 628                         il->preview = TRUE;
 629                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 630                         }
 631                 exif_free_fd(il->fd, exif);
 632                 }
 633
 634
 635         if (!il->mapped_file)
 636                 {
 637                 /* normal file */
 638                 gint load_fd;
 639
 640                 pathl = path_from_utf8(il->fd->path);
 641                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 642                 g_free(pathl);
 643                 if (load_fd == -1) return FALSE;
 644
 645                 if (fstat(load_fd, &st) == 0)
 646                         {
 647                         il->bytes_total = st.st_size;
 648                         }
 649                 else
 650                         {
 651                         close(load_fd);
 652                         return FALSE;
 653                         }
 654
 655                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 656                 close(load_fd);
 657                 if (il->mapped_file == MAP_FAILED)
 658                         {
 659                         il->mapped_file = 0;
 660                         return FALSE;
 661                         }
 662                 il->preview = FALSE;
 663                 }
 664
 665         return TRUE;
 666 }
 667
 668 static void image_loader_stop_source(ImageLoader *il)
 669 {
 670         if (!il) return;
 671
 672         if (il->mapped_file)
 673                 {
 674                 if (il->preview)
 675                         {
 676                         exif_free_preview(il->mapped_file);
 677                         }
 678                 else
 679                         {
 680                         munmap(il->mapped_file, il->bytes_total);
 681                         }
 682                 il->mapped_file = NULL;
 683                 }
 684 }
 685
 686 static void image_loader_stop(ImageLoader *il)
 687 {
 688         if (!il) return;
 689
 690         if (il->idle_id)
 691                 {
 692                 g_source_remove(il->idle_id);
 693                 il->idle_id = 0;
 694                 }
 695
 696         if (il->thread)
 697                 {
 698                 /* stop loader in the other thread */
 699                 g_mutex_lock(il->data_mutex);
 700                 il->stopping = TRUE;
 701                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 702                 g_mutex_unlock(il->data_mutex);
 703                 }
 704
 705         image_loader_stop_loader(il);
 706         image_loader_stop_source(il);
 707
 708 }
 709
 710 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
 711 {
 712         g_mutex_lock(il->data_mutex);
 713         il->delay_area_ready = enable;
 714         if (!enable)
 715                 {
 716                 /* send delayed */
 717                 GList *list, *work;
 718                 list = g_list_reverse(il->area_param_delayed_list);
 719                 il->area_param_delayed_list = NULL;
 720                 g_mutex_unlock(il->data_mutex);
 721
 722                 work = list;
 723
 724                 while (work)
 725                         {
 726                         ImageLoaderAreaParam *par = work->data;
 727                         work = work->next;
 728
 729                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 730                         g_free(par);
 731                         }
 732                 g_list_free(list);
 733                 }
 734         else
 735                 {
 736                 /* just unlock */
 737                 g_mutex_unlock(il->data_mutex);
 738                 }
 739 }
 740
 741
 742 /**************************************************************************************/
 743 /* execution via idle calls */
 744
 745 static gboolean image_loader_idle_cb(gpointer data)
 746 {
 747         gboolean ret = FALSE;
 748         ImageLoader *il = data;
 749
 750         if (il->idle_id)
 751                 {
 752                 ret = image_loader_continue(il);
 753                 }
 754
 755         if (!ret)
 756                 {
 757                 image_loader_stop_source(il);
 758                 }
 759
 760         return ret;
 761 }
 762
 763
 764 static gboolean image_loader_start_idle(ImageLoader *il)
 765 {
 766         gboolean ret;
 767
 768         if (!il) return FALSE;
 769
 770         if (!il->fd) return FALSE;
 771
 772         if (!image_loader_setup_source(il)) return FALSE;
 773
 774         ret = image_loader_begin(il);
 775
 776         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 777         return ret;
 778 }
 779
 780 /**************************************************************************************/
 781 /* execution via thread */
 782
 783 #ifdef HAVE_GTHREAD
 784 static GThreadPool *image_loader_thread_pool = NULL;
 785
 786 static GCond *image_loader_prio_cond = NULL;
 787 static GMutex *image_loader_prio_mutex = NULL;
 788 static gint image_loader_prio_num = 0;
 789
 790
 791 static void image_loader_thread_enter_high(void)
 792 {
 793         g_mutex_lock(image_loader_prio_mutex);
 794         image_loader_prio_num++;
 795         g_mutex_unlock(image_loader_prio_mutex);
 796 }
 797
 798 static void image_loader_thread_leave_high(void)
 799 {
 800         g_mutex_lock(image_loader_prio_mutex);
 801         image_loader_prio_num--;
 802         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
 803         g_mutex_unlock(image_loader_prio_mutex);
 804 }
 805
 806 static void image_loader_thread_wait_high(void)
 807 {
 808         g_mutex_lock(image_loader_prio_mutex);
 809         while (image_loader_prio_num)
 810                 {
 811                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 812                 }
 813
 814         g_mutex_unlock(image_loader_prio_mutex);
 815 }
 816
 817
 818 static void image_loader_thread_run(gpointer data, gpointer user_data)
 819 {
 820         ImageLoader *il = data;
 821         gboolean cont;
 822
 823         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 824                 {
 825                 /* low prio, wait untill high prio tasks finishes */
 826                 image_loader_thread_wait_high();
 827                 }
 828         else
 829                 {
 830                 /* high prio */
 831                 image_loader_thread_enter_high();
 832                 }
 833
 834         cont = image_loader_begin(il);
 835
 836         if (!cont && !image_loader_get_pixbuf(il))
 837                 {
 838                 /*
 839                 loader failed, we have to send signal
 840                 (idle mode returns the image_loader_begin return value directly)
 841                 (success is always reported indirectly from image_loader_begin)
 842                 */
 843                 image_loader_emit_error(il);
 844                 }
 845
 846         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 847                 {
 848                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 849                         {
 850                         /* low prio, wait untill high prio tasks finishes */
 851                         image_loader_thread_wait_high();
 852                         }
 853                 cont = image_loader_continue(il);
 854                 }
 855         image_loader_stop_loader(il);
 856
 857         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 858                 {
 859                 /* high prio */
 860                 image_loader_thread_leave_high();
 861                 }
 862
 863         g_mutex_lock(il->data_mutex);
 864         il->can_destroy = TRUE;
 865         g_cond_signal(il->can_destroy_cond);
 866         g_mutex_unlock(il->data_mutex);
 867
 868 }
 869
 870
 871 static gboolean image_loader_start_thread(ImageLoader *il)
 872 {
 873         if (!il) return FALSE;
 874
 875         if (!il->fd) return FALSE;
 876
 877         il->thread = TRUE;
 878
 879         if (!image_loader_setup_source(il)) return FALSE;
 880
 881         if (!image_loader_thread_pool)
 882                 {
 883                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 884                 image_loader_prio_cond = g_cond_new();
 885                 image_loader_prio_mutex = g_mutex_new();
 886                 }
 887
 888         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 889
 890         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 891         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 892
 893         return TRUE;
 894 }
 895 #endif /* HAVE_GTHREAD */
 896
 897
 898 /**************************************************************************************/
 899 /* public interface */
 900
 901
 902 gboolean image_loader_start(ImageLoader *il)
 903 {
 904         if (!il) return FALSE;
 905
 906         if (!il->fd) return FALSE;
 907
 908 #ifdef HAVE_GTHREAD
 909         return image_loader_start_thread(il);
 910 #else
 911         return image_loader_start_idle(il);
 912 #endif
 913 }
 914
 915
 916 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 917 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 918 {
 919         GdkPixbuf *ret;
 920         if (!il) return NULL;
 921
 922         g_mutex_lock(il->data_mutex);
 923         ret = il->pixbuf;
 924         g_mutex_unlock(il->data_mutex);
 925         return ret;
 926 }
 927
 928 gchar *image_loader_get_format(ImageLoader *il)
 929 {
 930         GdkPixbufFormat *format;
 931         gchar **mimev;
 932         gchar *mime;
 933
 934         if (!il || !il->loader) return NULL;
 935
 936         format = gdk_pixbuf_loader_get_format(il->loader);
 937         if (!format) return NULL;
 938
 939         mimev = gdk_pixbuf_format_get_mime_types(format);
 940         if (!mimev) return NULL;
 941
 942         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 943         mime = g_strdup(mimev[0]);
 944         g_strfreev(mimev);
 945
 946         return mime;
 947 }
 948
 949 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 950 {
 951         if (!il) return;
 952
 953         g_mutex_lock(il->data_mutex);
 954         il->requested_width = width;
 955         il->requested_height = height;
 956         g_mutex_unlock(il->data_mutex);
 957 }
 958
 959 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 960 {
 961         if (!il) return;
 962
 963         g_mutex_lock(il->data_mutex);
 964         il->idle_read_loop_count = count ? count : 1;
 965         g_mutex_unlock(il->data_mutex);
 966 }
 967
 968 void image_loader_set_priority(ImageLoader *il, gint priority)
 969 {
 970         if (!il) return;
 971
 972         if (il->thread) return; /* can't change prio if the thread already runs */
 973         il->idle_priority = priority;
 974 }
 975
 976
 977 gdouble image_loader_get_percent(ImageLoader *il)
 978 {
 979         gdouble ret;
 980         if (!il) return 0.0;
 981
 982         g_mutex_lock(il->data_mutex);
 983         if (il->bytes_total == 0)
 984                 {
 985                 ret = 0.0;
 986                 }
 987         else
 988                 {
 989                 ret = (gdouble)il->bytes_read / il->bytes_total;
 990                 }
 991         g_mutex_unlock(il->data_mutex);
 992         return ret;
 993 }
 994
 995 gboolean image_loader_get_is_done(ImageLoader *il)
 996 {
 997         gboolean ret;
 998         if (!il) return FALSE;
 999
1000         g_mutex_lock(il->data_mutex);
1001         ret = il->done;
1002         g_mutex_unlock(il->data_mutex);
1003
1004         return ret;
1005 }
1006
1007 FileData *image_loader_get_fd(ImageLoader *il)
1008 {
1009         FileData *ret;
1010         if (!il) return NULL;
1011
1012         g_mutex_lock(il->data_mutex);
1013         ret = il->fd;
1014         g_mutex_unlock(il->data_mutex);
1015
1016         return ret;
1017 }
1018
1019 gboolean image_loader_get_shrunk(ImageLoader *il)
1020 {
1021         gboolean ret;
1022         if (!il) return FALSE;
1023
1024         g_mutex_lock(il->data_mutex);
1025         ret = il->shrunk;
1026         g_mutex_unlock(il->data_mutex);
1027         return ret;
1028 }
1029
1030 const gchar *image_loader_get_error(ImageLoader *il)
1031 {
1032         const gchar *ret = NULL;
1033         if (!il) return NULL;
1034         g_mutex_lock(il->data_mutex);
1035         if (il->error) ret = il->error->message;
1036         g_mutex_unlock(il->data_mutex);
1037         return ret;
1038 }
1039
1040
1041 /* FIXME - this can be rather slow and blocks until the size is known */
1042 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1043 {
1044         ImageLoader *il;
1045         gboolean success;
1046
1047         il = image_loader_new(fd);
1048
1049         success = image_loader_start_idle(il);
1050
1051         if (success && il->pixbuf)
1052                 {
1053                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1054                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1055                 }
1056         else
1057                 {
1058                 if (width) *width = -1;
1059                 if (height) *height = -1;
1060                 }
1061
1062         image_loader_free(il);
1063
1064         return success;
1065 }
1066 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */