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
 391            http://bugzilla.gnome.org/show_bug.cgi?id=547669
 392            http://bugzilla.gnome.org/show_bug.cgi?id=589334
 393         */
 394         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 395         if (strcmp(format, "svg") == 0 ||
 396             strcmp(format, "xpm") == 0)
 397                 {
 398                 g_free(format);
 399                 return;
 400                 }
 401
 402         g_free(format);
 403
 404         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 405
 406         h = gdk_pixbuf_get_height(pb);
 407         rs = gdk_pixbuf_get_rowstride(pb);
 408         pix = gdk_pixbuf_get_pixels(pb);
 409
 410         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 411
 412 }
 413
 414 static void image_loader_size_cb(GdkPixbufLoader *loader,
 415                                  gint width, gint height, gpointer data)
 416 {
 417         ImageLoader *il = data;
 418         GdkPixbufFormat *format;
 419         gchar **mime_types;
 420         gboolean scale = FALSE;
 421         gint n;
 422
 423         g_mutex_lock(il->data_mutex);
 424         if (il->requested_width < 1 || il->requested_height < 1)
 425                 {
 426                 g_mutex_unlock(il->data_mutex);
 427                 return;
 428                 }
 429         g_mutex_unlock(il->data_mutex);
 430
 431         format = gdk_pixbuf_loader_get_format(loader);
 432         if (!format) return;
 433
 434         mime_types = gdk_pixbuf_format_get_mime_types(format);
 435         n = 0;
 436         while (mime_types[n])
 437                 {
 438                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 439                 n++;
 440                 }
 441         g_strfreev(mime_types);
 442
 443         if (!scale) return;
 444
 445         g_mutex_lock(il->data_mutex);
 446
 447         if (width > il->requested_width || height > il->requested_height)
 448                 {
 449                 gint nw, nh;
 450
 451                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 452                         {
 453                         nw = il->requested_width;
 454                         nh = (gdouble)nw / width * height;
 455                         if (nh < 1) nh = 1;
 456                         }
 457                 else
 458                         {
 459                         nh = il->requested_height;
 460                         nw = (gdouble)nh / height * width;
 461                         if (nw < 1) nw = 1;
 462                         }
 463
 464                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 465                 il->shrunk = TRUE;
 466                 }
 467         g_mutex_unlock(il->data_mutex);
 468
 469 }
 470
 471 static void image_loader_stop_loader(ImageLoader *il)
 472 {
 473         if (!il) return;
 474
 475         if (il->loader)
 476                 {
 477                 /* some loaders do not have a pixbuf till close, order is important here */
 478                 gdk_pixbuf_loader_close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 479                 image_loader_sync_pixbuf(il);
 480                 g_object_unref(G_OBJECT(il->loader));
 481                 il->loader = NULL;
 482                 }
 483         g_mutex_lock(il->data_mutex);
 484         il->done = TRUE;
 485         g_mutex_unlock(il->data_mutex);
 486 }
 487
 488 static void image_loader_setup_loader(ImageLoader *il)
 489 {
 490         g_mutex_lock(il->data_mutex);
 491         il->loader = gdk_pixbuf_loader_new();
 492
 493         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 494                          G_CALLBACK(image_loader_area_updated_cb), il);
 495         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 496                          G_CALLBACK(image_loader_size_cb), il);
 497         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 498                          G_CALLBACK(image_loader_area_prepared_cb), il);
 499         g_mutex_unlock(il->data_mutex);
 500 }
 501
 502
 503 static void image_loader_done(ImageLoader *il)
 504 {
 505         image_loader_stop_loader(il);
 506
 507         image_loader_emit_done(il);
 508 }
 509
 510 static void image_loader_error(ImageLoader *il)
 511 {
 512         image_loader_stop_loader(il);
 513
 514         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 515
 516         image_loader_emit_error(il);
 517 }
 518
 519 static gboolean image_loader_continue(ImageLoader *il)
 520 {
 521         gint b;
 522         gint c;
 523
 524         if (!il) return FALSE;
 525
 526         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 527         while (c > 0 && !image_loader_get_stopping(il))
 528                 {
 529                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 530
 531                 if (b == 0)
 532                         {
 533                         image_loader_done(il);
 534                         return FALSE;
 535                         }
 536
 537                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 538                         {
 539                         image_loader_error(il);
 540                         return FALSE;
 541                         }
 542
 543                 il->bytes_read += b;
 544
 545                 c--;
 546                 }
 547
 548         if (il->bytes_total > 0)
 549                 {
 550                 image_loader_emit_percent(il);
 551                 }
 552
 553         return TRUE;
 554 }
 555
 556 static gboolean image_loader_begin(ImageLoader *il)
 557 {
 558         gssize b;
 559
 560         if (il->pixbuf) return FALSE;
 561
 562         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 563         if (b < 1) return FALSE;
 564
 565         image_loader_setup_loader(il);
 566
 567         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error))
 568                 {
 569                 image_loader_stop_loader(il);
 570                 return FALSE;
 571                 }
 572
 573         il->bytes_read += b;
 574
 575         /* read until size is known */
 576         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 577                 {
 578                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 579                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 580                         {
 581                         image_loader_stop_loader(il);
 582                         return FALSE;
 583                         }
 584                 il->bytes_read += b;
 585                 }
 586         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 587
 588         if (il->bytes_read == il->bytes_total || b < 1)
 589                 {
 590                 /* done, handle (broken) loaders that do not have pixbuf till close */
 591                 image_loader_stop_loader(il);
 592
 593                 if (!il->pixbuf) return FALSE;
 594
 595                 image_loader_done(il);
 596                 return TRUE;
 597                 }
 598
 599         if (!il->pixbuf)
 600                 {
 601                 image_loader_stop_loader(il);
 602                 return FALSE;
 603                 }
 604
 605         return TRUE;
 606 }
 607
 608 /**************************************************************************************/
 609 /* the following functions are always executed in the main thread */
 610
 611
 612 static gboolean image_loader_setup_source(ImageLoader *il)
 613 {
 614         struct stat st;
 615         gchar *pathl;
 616
 617         if (!il || il->loader || il->mapped_file) return FALSE;
 618
 619         il->mapped_file = NULL;
 620
 621         if (il->fd)
 622                 {
 623                 ExifData *exif = exif_read_fd(il->fd);
 624
 625                 if (options->thumbnails.use_exif)
 626                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, il->requested_width, il->requested_height);
 627                 else
 628                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 629
 630                 if (il->mapped_file)
 631                         {
 632                         il->preview = TRUE;
 633                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 634                         }
 635                 exif_free_fd(il->fd, exif);
 636                 }
 637
 638
 639         if (!il->mapped_file)
 640                 {
 641                 /* normal file */
 642                 gint load_fd;
 643
 644                 pathl = path_from_utf8(il->fd->path);
 645                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 646                 g_free(pathl);
 647                 if (load_fd == -1) return FALSE;
 648
 649                 if (fstat(load_fd, &st) == 0)
 650                         {
 651                         il->bytes_total = st.st_size;
 652                         }
 653                 else
 654                         {
 655                         close(load_fd);
 656                         return FALSE;
 657                         }
 658
 659                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 660                 close(load_fd);
 661                 if (il->mapped_file == MAP_FAILED)
 662                         {
 663                         il->mapped_file = 0;
 664                         return FALSE;
 665                         }
 666                 il->preview = FALSE;
 667                 }
 668
 669         return TRUE;
 670 }
 671
 672 static void image_loader_stop_source(ImageLoader *il)
 673 {
 674         if (!il) return;
 675
 676         if (il->mapped_file)
 677                 {
 678                 if (il->preview)
 679                         {
 680                         exif_free_preview(il->mapped_file);
 681                         }
 682                 else
 683                         {
 684                         munmap(il->mapped_file, il->bytes_total);
 685                         }
 686                 il->mapped_file = NULL;
 687                 }
 688 }
 689
 690 static void image_loader_stop(ImageLoader *il)
 691 {
 692         if (!il) return;
 693
 694         if (il->idle_id)
 695                 {
 696                 g_source_remove(il->idle_id);
 697                 il->idle_id = 0;
 698                 }
 699
 700         if (il->thread)
 701                 {
 702                 /* stop loader in the other thread */
 703                 g_mutex_lock(il->data_mutex);
 704                 il->stopping = TRUE;
 705                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 706                 g_mutex_unlock(il->data_mutex);
 707                 }
 708
 709         image_loader_stop_loader(il);
 710         image_loader_stop_source(il);
 711
 712 }
 713
 714 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
 715 {
 716         g_mutex_lock(il->data_mutex);
 717         il->delay_area_ready = enable;
 718         if (!enable)
 719                 {
 720                 /* send delayed */
 721                 GList *list, *work;
 722                 list = g_list_reverse(il->area_param_delayed_list);
 723                 il->area_param_delayed_list = NULL;
 724                 g_mutex_unlock(il->data_mutex);
 725
 726                 work = list;
 727
 728                 while (work)
 729                         {
 730                         ImageLoaderAreaParam *par = work->data;
 731                         work = work->next;
 732
 733                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 734                         g_free(par);
 735                         }
 736                 g_list_free(list);
 737                 }
 738         else
 739                 {
 740                 /* just unlock */
 741                 g_mutex_unlock(il->data_mutex);
 742                 }
 743 }
 744
 745
 746 /**************************************************************************************/
 747 /* execution via idle calls */
 748
 749 static gboolean image_loader_idle_cb(gpointer data)
 750 {
 751         gboolean ret = FALSE;
 752         ImageLoader *il = data;
 753
 754         if (il->idle_id)
 755                 {
 756                 ret = image_loader_continue(il);
 757                 }
 758
 759         if (!ret)
 760                 {
 761                 image_loader_stop_source(il);
 762                 }
 763
 764         return ret;
 765 }
 766
 767
 768 static gboolean image_loader_start_idle(ImageLoader *il)
 769 {
 770         gboolean ret;
 771
 772         if (!il) return FALSE;
 773
 774         if (!il->fd) return FALSE;
 775
 776         if (!image_loader_setup_source(il)) return FALSE;
 777
 778         ret = image_loader_begin(il);
 779
 780         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 781         return ret;
 782 }
 783
 784 /**************************************************************************************/
 785 /* execution via thread */
 786
 787 #ifdef HAVE_GTHREAD
 788 static GThreadPool *image_loader_thread_pool = NULL;
 789
 790 static GCond *image_loader_prio_cond = NULL;
 791 static GMutex *image_loader_prio_mutex = NULL;
 792 static gint image_loader_prio_num = 0;
 793
 794
 795 static void image_loader_thread_enter_high(void)
 796 {
 797         g_mutex_lock(image_loader_prio_mutex);
 798         image_loader_prio_num++;
 799         g_mutex_unlock(image_loader_prio_mutex);
 800 }
 801
 802 static void image_loader_thread_leave_high(void)
 803 {
 804         g_mutex_lock(image_loader_prio_mutex);
 805         image_loader_prio_num--;
 806         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
 807         g_mutex_unlock(image_loader_prio_mutex);
 808 }
 809
 810 static void image_loader_thread_wait_high(void)
 811 {
 812         g_mutex_lock(image_loader_prio_mutex);
 813         while (image_loader_prio_num)
 814                 {
 815                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 816                 }
 817
 818         g_mutex_unlock(image_loader_prio_mutex);
 819 }
 820
 821
 822 static void image_loader_thread_run(gpointer data, gpointer user_data)
 823 {
 824         ImageLoader *il = data;
 825         gboolean cont;
 826
 827         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 828                 {
 829                 /* low prio, wait untill high prio tasks finishes */
 830                 image_loader_thread_wait_high();
 831                 }
 832         else
 833                 {
 834                 /* high prio */
 835                 image_loader_thread_enter_high();
 836                 }
 837
 838         cont = image_loader_begin(il);
 839
 840         if (!cont && !image_loader_get_pixbuf(il))
 841                 {
 842                 /*
 843                 loader failed, we have to send signal
 844                 (idle mode returns the image_loader_begin return value directly)
 845                 (success is always reported indirectly from image_loader_begin)
 846                 */
 847                 image_loader_emit_error(il);
 848                 }
 849
 850         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 851                 {
 852                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 853                         {
 854                         /* low prio, wait untill high prio tasks finishes */
 855                         image_loader_thread_wait_high();
 856                         }
 857                 cont = image_loader_continue(il);
 858                 }
 859         image_loader_stop_loader(il);
 860
 861         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 862                 {
 863                 /* high prio */
 864                 image_loader_thread_leave_high();
 865                 }
 866
 867         g_mutex_lock(il->data_mutex);
 868         il->can_destroy = TRUE;
 869         g_cond_signal(il->can_destroy_cond);
 870         g_mutex_unlock(il->data_mutex);
 871
 872 }
 873
 874
 875 static gboolean image_loader_start_thread(ImageLoader *il)
 876 {
 877         if (!il) return FALSE;
 878
 879         if (!il->fd) return FALSE;
 880
 881         il->thread = TRUE;
 882
 883         if (!image_loader_setup_source(il)) return FALSE;
 884
 885         if (!image_loader_thread_pool)
 886                 {
 887                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 888                 image_loader_prio_cond = g_cond_new();
 889                 image_loader_prio_mutex = g_mutex_new();
 890                 }
 891
 892         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 893
 894         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 895         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 896
 897         return TRUE;
 898 }
 899 #endif /* HAVE_GTHREAD */
 900
 901
 902 /**************************************************************************************/
 903 /* public interface */
 904
 905
 906 gboolean image_loader_start(ImageLoader *il)
 907 {
 908         if (!il) return FALSE;
 909
 910         if (!il->fd) return FALSE;
 911
 912 #ifdef HAVE_GTHREAD
 913         return image_loader_start_thread(il);
 914 #else
 915         return image_loader_start_idle(il);
 916 #endif
 917 }
 918
 919
 920 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 921 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 922 {
 923         GdkPixbuf *ret;
 924         if (!il) return NULL;
 925
 926         g_mutex_lock(il->data_mutex);
 927         ret = il->pixbuf;
 928         g_mutex_unlock(il->data_mutex);
 929         return ret;
 930 }
 931
 932 gchar *image_loader_get_format(ImageLoader *il)
 933 {
 934         GdkPixbufFormat *format;
 935         gchar **mimev;
 936         gchar *mime;
 937
 938         if (!il || !il->loader) return NULL;
 939
 940         format = gdk_pixbuf_loader_get_format(il->loader);
 941         if (!format) return NULL;
 942
 943         mimev = gdk_pixbuf_format_get_mime_types(format);
 944         if (!mimev) return NULL;
 945
 946         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 947         mime = g_strdup(mimev[0]);
 948         g_strfreev(mimev);
 949
 950         return mime;
 951 }
 952
 953 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 954 {
 955         if (!il) return;
 956
 957         g_mutex_lock(il->data_mutex);
 958         il->requested_width = width;
 959         il->requested_height = height;
 960         g_mutex_unlock(il->data_mutex);
 961 }
 962
 963 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 964 {
 965         if (!il) return;
 966
 967         g_mutex_lock(il->data_mutex);
 968         il->idle_read_loop_count = count ? count : 1;
 969         g_mutex_unlock(il->data_mutex);
 970 }
 971
 972 void image_loader_set_priority(ImageLoader *il, gint priority)
 973 {
 974         if (!il) return;
 975
 976         if (il->thread) return; /* can't change prio if the thread already runs */
 977         il->idle_priority = priority;
 978 }
 979
 980
 981 gdouble image_loader_get_percent(ImageLoader *il)
 982 {
 983         gdouble ret;
 984         if (!il) return 0.0;
 985
 986         g_mutex_lock(il->data_mutex);
 987         if (il->bytes_total == 0)
 988                 {
 989                 ret = 0.0;
 990                 }
 991         else
 992                 {
 993                 ret = (gdouble)il->bytes_read / il->bytes_total;
 994                 }
 995         g_mutex_unlock(il->data_mutex);
 996         return ret;
 997 }
 998
 999 gboolean image_loader_get_is_done(ImageLoader *il)
1000 {
1001         gboolean ret;
1002         if (!il) return FALSE;
1003
1004         g_mutex_lock(il->data_mutex);
1005         ret = il->done;
1006         g_mutex_unlock(il->data_mutex);
1007
1008         return ret;
1009 }
1010
1011 FileData *image_loader_get_fd(ImageLoader *il)
1012 {
1013         FileData *ret;
1014         if (!il) return NULL;
1015
1016         g_mutex_lock(il->data_mutex);
1017         ret = il->fd;
1018         g_mutex_unlock(il->data_mutex);
1019
1020         return ret;
1021 }
1022
1023 gboolean image_loader_get_shrunk(ImageLoader *il)
1024 {
1025         gboolean ret;
1026         if (!il) return FALSE;
1027
1028         g_mutex_lock(il->data_mutex);
1029         ret = il->shrunk;
1030         g_mutex_unlock(il->data_mutex);
1031         return ret;
1032 }
1033
1034 const gchar *image_loader_get_error(ImageLoader *il)
1035 {
1036         const gchar *ret = NULL;
1037         if (!il) return NULL;
1038         g_mutex_lock(il->data_mutex);
1039         if (il->error) ret = il->error->message;
1040         g_mutex_unlock(il->data_mutex);
1041         return ret;
1042 }
1043
1044
1045 /* FIXME - this can be rather slow and blocks until the size is known */
1046 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1047 {
1048         ImageLoader *il;
1049         gboolean success;
1050
1051         il = image_loader_new(fd);
1052
1053         success = image_loader_start_idle(il);
1054
1055         if (success && il->pixbuf)
1056                 {
1057                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1058                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1059                 }
1060         else
1061                 {
1062                 if (width) *width = -1;
1063                 if (height) *height = -1;
1064                 }
1065
1066         image_loader_free(il);
1067
1068         return success;
1069 }
1070 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */