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