src/image-load.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 - 2010 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 #include "image_load_gdk.h"
  17 #include "image_load_jpeg.h"
  18
  19 #include "exif.h"
  20 #include "filedata.h"
  21 #include "ui_fileops.h"
  22 #include "gq-marshal.h"
  23
  24 #include <fcntl.h>
  25 #include <sys/mman.h>
  26
  27 #define IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT   4096
  28 #define IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT       1
  29
  30
  31 /**************************************************************************************/
  32 /* image loader class */
  33
  34
  35 enum {
  36         SIGNAL_AREA_READY = 0,
  37         SIGNAL_ERROR,
  38         SIGNAL_DONE,
  39         SIGNAL_PERCENT,
  40         SIGNAL_SIZE,
  41         SIGNAL_COUNT
  42 };
  43
  44 static guint signals[SIGNAL_COUNT] = { 0 };
  45
  46 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
  47 static void image_loader_class_init(ImageLoaderClass *class);
  48 static void image_loader_finalize(GObject *object);
  49 static void image_loader_stop(ImageLoader *il);
  50
  51 GType image_loader_get_type(void)
  52 {
  53         static GType type = 0;
  54         if (type == 0)
  55                 {
  56                 static const GTypeInfo info = {
  57                         sizeof(ImageLoaderClass),
  58                         NULL,   /* base_init */
  59                         NULL,   /* base_finalize */
  60                         (GClassInitFunc)image_loader_class_init, /* class_init */
  61                         NULL,   /* class_finalize */
  62                         NULL,   /* class_data */
  63                         sizeof(ImageLoader),
  64                         0,      /* n_preallocs */
  65                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  66                         NULL    /* value_table */
  67                         };
  68                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  69                 }
  70         return type;
  71 }
  72
  73 static void image_loader_init(GTypeInstance *instance, gpointer g_class)
  74 {
  75         ImageLoader *il = (ImageLoader *)instance;
  76
  77         il->pixbuf = NULL;
  78         il->idle_id = 0;
  79         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  80         il->done = FALSE;
  81         il->loader = NULL;
  82
  83         il->bytes_read = 0;
  84         il->bytes_total = 0;
  85
  86         il->idle_done_id = 0;
  87
  88         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
  89         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
  90         il->mapped_file = NULL;
  91
  92         il->requested_width = 0;
  93         il->requested_height = 0;
  94         il->shrunk = FALSE;
  95
  96         il->can_destroy = TRUE;
  97
  98 #ifdef HAVE_GTHREAD
  99         il->data_mutex = g_mutex_new();
 100         il->can_destroy_cond = g_cond_new();
 101 #endif
 102         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
 103 }
 104
 105 static void image_loader_class_init(ImageLoaderClass *class)
 106 {
 107         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 108
 109 //      gobject_class->set_property = image_loader_set_property;
 110 //      gobject_class->get_property = image_loader_get_property;
 111
 112         gobject_class->finalize = image_loader_finalize;
 113
 114
 115         signals[SIGNAL_AREA_READY] =
 116                 g_signal_new("area_ready",
 117                              G_OBJECT_CLASS_TYPE(gobject_class),
 118                              G_SIGNAL_RUN_LAST,
 119                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 120                              NULL, NULL,
 121                              gq_marshal_VOID__INT_INT_INT_INT,
 122                              G_TYPE_NONE, 4,
 123                              G_TYPE_INT,
 124                              G_TYPE_INT,
 125                              G_TYPE_INT,
 126                              G_TYPE_INT);
 127
 128         signals[SIGNAL_ERROR] =
 129                 g_signal_new("error",
 130                              G_OBJECT_CLASS_TYPE(gobject_class),
 131                              G_SIGNAL_RUN_LAST,
 132                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 133                              NULL, NULL,
 134                              g_cclosure_marshal_VOID__VOID,
 135                              G_TYPE_NONE, 0);
 136
 137         signals[SIGNAL_DONE] =
 138                 g_signal_new("done",
 139                              G_OBJECT_CLASS_TYPE(gobject_class),
 140                              G_SIGNAL_RUN_LAST,
 141                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 142                              NULL, NULL,
 143                              g_cclosure_marshal_VOID__VOID,
 144                              G_TYPE_NONE, 0);
 145
 146         signals[SIGNAL_PERCENT] =
 147                 g_signal_new("percent",
 148                              G_OBJECT_CLASS_TYPE(gobject_class),
 149                              G_SIGNAL_RUN_LAST,
 150                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 151                              NULL, NULL,
 152                              g_cclosure_marshal_VOID__DOUBLE,
 153                              G_TYPE_NONE, 1,
 154                              G_TYPE_DOUBLE);
 155
 156         signals[SIGNAL_SIZE] =
 157                 g_signal_new("size_prepared",
 158                              G_OBJECT_CLASS_TYPE(gobject_class),
 159                              G_SIGNAL_RUN_LAST,
 160                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 161                              NULL, NULL,
 162                              gq_marshal_VOID__INT_INT,
 163                              G_TYPE_NONE, 2,
 164                              G_TYPE_INT,
 165                              G_TYPE_INT);
 166
 167 }
 168
 169 static void image_loader_finalize(GObject *object)
 170 {
 171         ImageLoader *il = (ImageLoader *)object;
 172
 173         image_loader_stop(il);
 174
 175         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 176
 177         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, il, il->bytes_read);
 178
 179         if (il->idle_done_id)
 180                 {
 181                 g_source_remove(il->idle_done_id);
 182                 il->idle_done_id = 0;
 183                 }
 184
 185         while (g_source_remove_by_user_data(il))
 186                 {
 187                 DEBUG_2("pending signals detected");
 188                 }
 189
 190         while (il->area_param_list)
 191                 {
 192                 DEBUG_1("pending area_ready signals detected");
 193                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 194                 g_free(il->area_param_list->data);
 195                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 196                 }
 197
 198         while (il->area_param_delayed_list)
 199                 {
 200                 g_free(il->area_param_delayed_list->data);
 201                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 202                 }
 203
 204         if (il->pixbuf) g_object_unref(il->pixbuf);
 205
 206         if (il->error) g_error_free(il->error);
 207
 208         file_data_unref(il->fd);
 209 #ifdef HAVE_GTHREAD
 210         g_mutex_free(il->data_mutex);
 211         g_cond_free(il->can_destroy_cond);
 212 #endif
 213 }
 214
 215 void image_loader_free(ImageLoader *il)
 216 {
 217         if (!il) return;
 218         g_object_unref(G_OBJECT(il));
 219 }
 220
 221
 222 ImageLoader *image_loader_new(FileData *fd)
 223 {
 224         ImageLoader *il;
 225
 226         if (!fd) return NULL;
 227
 228         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 229
 230         il->fd = file_data_ref(fd);
 231
 232         return il;
 233 }
 234
 235 /**************************************************************************************/
 236 /* send signals via idle calbacks - the callback are executed in the main thread */
 237
 238 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 239 struct _ImageLoaderAreaParam {
 240         ImageLoader *il;
 241         guint x;
 242         guint y;
 243         guint w;
 244         guint h;
 245 };
 246
 247
 248 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 249 {
 250         ImageLoaderAreaParam *par = data;
 251         ImageLoader *il = par->il;
 252         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 253         g_mutex_lock(il->data_mutex);
 254         il->area_param_list = g_list_remove(il->area_param_list, par);
 255         g_free(par);
 256         g_mutex_unlock(il->data_mutex);
 257
 258         return FALSE;
 259 }
 260
 261 static gboolean image_loader_emit_done_cb(gpointer data)
 262 {
 263         ImageLoader *il = data;
 264         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 265         return FALSE;
 266 }
 267
 268 static gboolean image_loader_emit_error_cb(gpointer data)
 269 {
 270         ImageLoader *il = data;
 271         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 272         return FALSE;
 273 }
 274
 275 static gboolean image_loader_emit_percent_cb(gpointer data)
 276 {
 277         ImageLoader *il = data;
 278         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 279         return FALSE;
 280 }
 281
 282 /* DONE and ERROR are emited only once, thus they can have normal priority
 283    PERCENT and AREA_READY should be processed ASAP
 284 */
 285
 286 static void image_loader_emit_done(ImageLoader *il)
 287 {
 288         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 289 }
 290
 291 static void image_loader_emit_error(ImageLoader *il)
 292 {
 293         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 294 }
 295
 296 static void image_loader_emit_percent(ImageLoader *il)
 297 {
 298         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 299 }
 300
 301 /* this function expects that il->data_mutex is locked by caller */
 302 static void image_loader_emit_area_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_list = g_list_prepend(il->area_param_list, par);
 312
 313         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 314 }
 315
 316 /**************************************************************************************/
 317 /* the following functions may be executed in separate thread */
 318
 319 /* this function expects that il->data_mutex is locked by caller */
 320 static void image_loader_queue_delayed_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 321 {
 322         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 323         par->il = il;
 324         par->x = x;
 325         par->y = y;
 326         par->w = w;
 327         par->h = h;
 328
 329         il->area_param_delayed_list = g_list_prepend(il->area_param_delayed_list, par);
 330 }
 331
 332
 333
 334 static gboolean image_loader_get_stopping(ImageLoader *il)
 335 {
 336         gboolean ret;
 337         if (!il) return FALSE;
 338
 339         g_mutex_lock(il->data_mutex);
 340         ret = il->stopping;
 341         g_mutex_unlock(il->data_mutex);
 342
 343         return ret;
 344 }
 345
 346
 347 static void image_loader_sync_pixbuf(ImageLoader *il)
 348 {
 349         GdkPixbuf *pb;
 350
 351         g_mutex_lock(il->data_mutex);
 352
 353         if (!il->loader)
 354                 {
 355                 g_mutex_unlock(il->data_mutex);
 356                 return;
 357                 }
 358
 359         pb = il->backend.get_pixbuf(il->loader);
 360
 361         if (pb == il->pixbuf)
 362                 {
 363                 g_mutex_unlock(il->data_mutex);
 364                 return;
 365                 }
 366
 367         if (g_ascii_strcasecmp(".jps", il->fd->extension) == 0)
 368                 {
 369                 g_object_set_data(G_OBJECT(pb), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
 370                 }
 371
 372         if (il->pixbuf) g_object_unref(il->pixbuf);
 373
 374         il->pixbuf = pb;
 375         if (il->pixbuf) g_object_ref(il->pixbuf);
 376
 377         g_mutex_unlock(il->data_mutex);
 378 }
 379
 380 static void image_loader_area_updated_cb(gpointer loader,
 381                                  guint x, guint y, guint w, guint h,
 382                                  gpointer data)
 383 {
 384         ImageLoader *il = data;
 385
 386         if (!image_loader_get_pixbuf(il))
 387                 {
 388                 image_loader_sync_pixbuf(il);
 389                 if (!image_loader_get_pixbuf(il))
 390                         {
 391                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 392                         }
 393                 }
 394
 395         g_mutex_lock(il->data_mutex);
 396         if (il->delay_area_ready)
 397                 image_loader_queue_delayed_area_ready(il, x, y, w, h);
 398         else
 399                 image_loader_emit_area_ready(il, x, y, w, h);
 400
 401         if (il->stopping) il->backend.abort(il->loader);
 402
 403         g_mutex_unlock(il->data_mutex);
 404 }
 405
 406 static void image_loader_area_prepared_cb(gpointer loader, gpointer data)
 407 {
 408         ImageLoader *il = data;
 409         GdkPixbuf *pb;
 410         guchar *pix;
 411         size_t h, rs;
 412
 413         /* a workaround for
 414            http://bugzilla.gnome.org/show_bug.cgi?id=547669
 415            http://bugzilla.gnome.org/show_bug.cgi?id=589334
 416         */
 417         gchar *format = il->backend.get_format_name(loader);
 418         if (strcmp(format, "svg") == 0 ||
 419             strcmp(format, "xpm") == 0)
 420                 {
 421                 g_free(format);
 422                 return;
 423                 }
 424
 425         g_free(format);
 426
 427         pb = il->backend.get_pixbuf(loader);
 428
 429         h = gdk_pixbuf_get_height(pb);
 430         rs = gdk_pixbuf_get_rowstride(pb);
 431         pix = gdk_pixbuf_get_pixels(pb);
 432
 433         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 434
 435 }
 436
 437 static void image_loader_size_cb(gpointer loader,
 438                                  gint width, gint height, gpointer data)
 439 {
 440         ImageLoader *il = data;
 441         gchar **mime_types;
 442         gboolean scale = FALSE;
 443         gint n;
 444
 445         g_mutex_lock(il->data_mutex);
 446         if (il->requested_width < 1 || il->requested_height < 1)
 447                 {
 448                 g_mutex_unlock(il->data_mutex);
 449                 g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 450                 return;
 451                 }
 452         g_mutex_unlock(il->data_mutex);
 453
 454         mime_types = il->backend.get_format_mime_types(loader);
 455         n = 0;
 456         while (mime_types[n])
 457                 {
 458                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 459                 n++;
 460                 }
 461         g_strfreev(mime_types);
 462
 463         if (!scale)
 464                 {
 465                 g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 466                 return;
 467                 }
 468
 469         g_mutex_lock(il->data_mutex);
 470
 471         gint nw, nh;
 472         if (width > il->requested_width || height > il->requested_height)
 473                 {
 474
 475                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 476                         {
 477                         nw = il->requested_width;
 478                         nh = (gdouble)nw / width * height;
 479                         if (nh < 1) nh = 1;
 480                         }
 481                 else
 482                         {
 483                         nh = il->requested_height;
 484                         nw = (gdouble)nh / height * width;
 485                         if (nw < 1) nw = 1;
 486                         }
 487
 488                 il->backend.set_size(loader, nw, nh);
 489                 il->shrunk = TRUE;
 490                 }
 491         g_mutex_unlock(il->data_mutex);
 492
 493         g_signal_emit(il, signals[SIGNAL_SIZE], 0, nw, nh);
 494 }
 495
 496 static void image_loader_stop_loader(ImageLoader *il)
 497 {
 498         if (!il) return;
 499
 500         if (il->loader)
 501                 {
 502                 /* some loaders do not have a pixbuf till close, order is important here */
 503                 il->backend.close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 504                 image_loader_sync_pixbuf(il);
 505                 il->backend.free(il->loader);
 506                 il->loader = NULL;
 507                 }
 508         g_mutex_lock(il->data_mutex);
 509         il->done = TRUE;
 510         g_mutex_unlock(il->data_mutex);
 511 }
 512
 513 static void image_loader_setup_loader(ImageLoader *il)
 514 {
 515         g_mutex_lock(il->data_mutex);
 516 #ifdef HAVE_JPEG
 517         if (il->bytes_total >= 2 && il->mapped_file[0] == 0xff && il->mapped_file[1] == 0xd8)
 518                 {
 519                 DEBUG_1("Using custom jpeg loader");
 520                 image_loader_backend_set_jpeg(&il->backend);
 521                 }
 522         else
 523 #endif
 524                 image_loader_backend_set_default(&il->backend);
 525
 526         il->loader = il->backend.loader_new(image_loader_area_updated_cb, image_loader_size_cb, image_loader_area_prepared_cb, il);
 527         g_mutex_unlock(il->data_mutex);
 528 }
 529
 530
 531 static void image_loader_done(ImageLoader *il)
 532 {
 533         image_loader_stop_loader(il);
 534
 535         image_loader_emit_done(il);
 536 }
 537
 538 static void image_loader_error(ImageLoader *il)
 539 {
 540         image_loader_stop_loader(il);
 541
 542         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 543
 544         image_loader_emit_error(il);
 545 }
 546
 547 static gboolean image_loader_continue(ImageLoader *il)
 548 {
 549         gint b;
 550         gint c;
 551
 552         if (!il) return FALSE;
 553
 554         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 555         while (c > 0 && !image_loader_get_stopping(il))
 556                 {
 557                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 558
 559                 if (b == 0)
 560                         {
 561                         image_loader_done(il);
 562                         return FALSE;
 563                         }
 564
 565                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 566                         {
 567                         image_loader_error(il);
 568                         return FALSE;
 569                         }
 570
 571                 il->bytes_read += b;
 572
 573                 c--;
 574                 }
 575
 576         if (il->bytes_total > 0)
 577                 {
 578                 image_loader_emit_percent(il);
 579                 }
 580
 581         return TRUE;
 582 }
 583
 584 static gboolean image_loader_begin(ImageLoader *il)
 585 {
 586         gssize b;
 587
 588         if (il->pixbuf) return FALSE;
 589
 590         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 591         if (b < 1) return FALSE;
 592
 593         image_loader_setup_loader(il);
 594
 595         g_assert(il->bytes_read == 0);
 596         if (il->backend.load) {
 597                 b = il->bytes_total;
 598                 if (!il->backend.load(il->loader, il->mapped_file, b, &il->error))
 599                         {
 600                         image_loader_stop_loader(il);
 601                         return FALSE;
 602                         }
 603         }
 604         else if (!il->backend.write(il->loader, il->mapped_file, b, &il->error))
 605                 {
 606                 image_loader_stop_loader(il);
 607                 return FALSE;
 608                 }
 609
 610         il->bytes_read += b;
 611
 612         /* read until size is known */
 613         while (il->loader && !il->backend.get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 614                 {
 615                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 616                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 617                         {
 618                         image_loader_stop_loader(il);
 619                         return FALSE;
 620                         }
 621                 il->bytes_read += b;
 622                 }
 623         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 624
 625         if (il->bytes_read == il->bytes_total || b < 1)
 626                 {
 627                 /* done, handle (broken) loaders that do not have pixbuf till close */
 628                 image_loader_stop_loader(il);
 629
 630                 if (!il->pixbuf) return FALSE;
 631
 632                 image_loader_done(il);
 633                 return TRUE;
 634                 }
 635
 636         if (!il->pixbuf)
 637                 {
 638                 image_loader_stop_loader(il);
 639                 return FALSE;
 640                 }
 641
 642         return TRUE;
 643 }
 644
 645 /**************************************************************************************/
 646 /* the following functions are always executed in the main thread */
 647
 648
 649 static gboolean image_loader_setup_source(ImageLoader *il)
 650 {
 651         struct stat st;
 652         gchar *pathl;
 653
 654         if (!il || il->loader || il->mapped_file) return FALSE;
 655
 656         il->mapped_file = NULL;
 657
 658         if (il->fd)
 659                 {
 660                 ExifData *exif = exif_read_fd(il->fd);
 661
 662                 if (options->thumbnails.use_exif)
 663                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, il->requested_width, il->requested_height);
 664                 else
 665                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 666
 667                 if (il->mapped_file)
 668                         {
 669                         il->preview = TRUE;
 670                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 671                         }
 672                 exif_free_fd(il->fd, exif);
 673                 }
 674
 675
 676         if (!il->mapped_file)
 677                 {
 678                 /* normal file */
 679                 gint load_fd;
 680
 681                 pathl = path_from_utf8(il->fd->path);
 682                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 683                 g_free(pathl);
 684                 if (load_fd == -1) return FALSE;
 685
 686                 if (fstat(load_fd, &st) == 0)
 687                         {
 688                         il->bytes_total = st.st_size;
 689                         }
 690                 else
 691                         {
 692                         close(load_fd);
 693                         return FALSE;
 694                         }
 695
 696                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 697                 close(load_fd);
 698                 if (il->mapped_file == MAP_FAILED)
 699                         {
 700                         il->mapped_file = 0;
 701                         return FALSE;
 702                         }
 703                 il->preview = FALSE;
 704                 }
 705
 706         return TRUE;
 707 }
 708
 709 static void image_loader_stop_source(ImageLoader *il)
 710 {
 711         if (!il) return;
 712
 713         if (il->mapped_file)
 714                 {
 715                 if (il->preview)
 716                         {
 717                         exif_free_preview(il->mapped_file);
 718                         }
 719                 else
 720                         {
 721                         munmap(il->mapped_file, il->bytes_total);
 722                         }
 723                 il->mapped_file = NULL;
 724                 }
 725 }
 726
 727 static void image_loader_stop(ImageLoader *il)
 728 {
 729         if (!il) return;
 730
 731         if (il->idle_id)
 732                 {
 733                 g_source_remove(il->idle_id);
 734                 il->idle_id = 0;
 735                 }
 736
 737         if (il->thread)
 738                 {
 739                 /* stop loader in the other thread */
 740                 g_mutex_lock(il->data_mutex);
 741                 il->stopping = TRUE;
 742                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 743                 g_mutex_unlock(il->data_mutex);
 744                 }
 745
 746         image_loader_stop_loader(il);
 747         image_loader_stop_source(il);
 748
 749 }
 750
 751 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
 752 {
 753         g_mutex_lock(il->data_mutex);
 754         il->delay_area_ready = enable;
 755         if (!enable)
 756                 {
 757                 /* send delayed */
 758                 GList *list, *work;
 759                 list = g_list_reverse(il->area_param_delayed_list);
 760                 il->area_param_delayed_list = NULL;
 761                 g_mutex_unlock(il->data_mutex);
 762
 763                 work = list;
 764
 765                 while (work)
 766                         {
 767                         ImageLoaderAreaParam *par = work->data;
 768                         work = work->next;
 769
 770                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 771                         g_free(par);
 772                         }
 773                 g_list_free(list);
 774                 }
 775         else
 776                 {
 777                 /* just unlock */
 778                 g_mutex_unlock(il->data_mutex);
 779                 }
 780 }
 781
 782
 783 /**************************************************************************************/
 784 /* execution via idle calls */
 785
 786 static gboolean image_loader_idle_cb(gpointer data)
 787 {
 788         gboolean ret = FALSE;
 789         ImageLoader *il = data;
 790
 791         if (il->idle_id)
 792                 {
 793                 ret = image_loader_continue(il);
 794                 }
 795
 796         if (!ret)
 797                 {
 798                 image_loader_stop_source(il);
 799                 }
 800
 801         return ret;
 802 }
 803
 804
 805 static gboolean image_loader_start_idle(ImageLoader *il)
 806 {
 807         gboolean ret;
 808
 809         if (!il) return FALSE;
 810
 811         if (!il->fd) return FALSE;
 812
 813         if (!image_loader_setup_source(il)) return FALSE;
 814
 815         ret = image_loader_begin(il);
 816
 817         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 818         return ret;
 819 }
 820
 821 /**************************************************************************************/
 822 /* execution via thread */
 823
 824 #ifdef HAVE_GTHREAD
 825 static GThreadPool *image_loader_thread_pool = NULL;
 826
 827 static GCond *image_loader_prio_cond = NULL;
 828 static GMutex *image_loader_prio_mutex = NULL;
 829 static gint image_loader_prio_num = 0;
 830
 831
 832 static void image_loader_thread_enter_high(void)
 833 {
 834         g_mutex_lock(image_loader_prio_mutex);
 835         image_loader_prio_num++;
 836         g_mutex_unlock(image_loader_prio_mutex);
 837 }
 838
 839 static void image_loader_thread_leave_high(void)
 840 {
 841         g_mutex_lock(image_loader_prio_mutex);
 842         image_loader_prio_num--;
 843         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
 844         g_mutex_unlock(image_loader_prio_mutex);
 845 }
 846
 847 static void image_loader_thread_wait_high(void)
 848 {
 849         g_mutex_lock(image_loader_prio_mutex);
 850         while (image_loader_prio_num)
 851                 {
 852                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 853                 }
 854
 855         g_mutex_unlock(image_loader_prio_mutex);
 856 }
 857
 858
 859 static void image_loader_thread_run(gpointer data, gpointer user_data)
 860 {
 861         ImageLoader *il = data;
 862         gboolean cont;
 863         gboolean err;
 864
 865         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 866                 {
 867                 /* low prio, wait untill high prio tasks finishes */
 868                 image_loader_thread_wait_high();
 869                 }
 870         else
 871                 {
 872                 /* high prio */
 873                 image_loader_thread_enter_high();
 874                 }
 875
 876         err = !image_loader_begin(il);
 877
 878         if (err)
 879                 {
 880                 /*
 881                 loader failed, we have to send signal
 882                 (idle mode returns the image_loader_begin return value directly)
 883                 (success is always reported indirectly from image_loader_begin)
 884                 */
 885                 image_loader_emit_error(il);
 886                 }
 887
 888         cont = !err;
 889
 890         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 891                 {
 892                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 893                         {
 894                         /* low prio, wait untill high prio tasks finishes */
 895                         image_loader_thread_wait_high();
 896                         }
 897                 cont = image_loader_continue(il);
 898                 }
 899         image_loader_stop_loader(il);
 900
 901         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 902                 {
 903                 /* high prio */
 904                 image_loader_thread_leave_high();
 905                 }
 906
 907         g_mutex_lock(il->data_mutex);
 908         il->can_destroy = TRUE;
 909         g_cond_signal(il->can_destroy_cond);
 910         g_mutex_unlock(il->data_mutex);
 911
 912 }
 913
 914
 915 static gboolean image_loader_start_thread(ImageLoader *il)
 916 {
 917         if (!il) return FALSE;
 918
 919         if (!il->fd) return FALSE;
 920
 921         il->thread = TRUE;
 922
 923         if (!image_loader_setup_source(il)) return FALSE;
 924
 925         if (!image_loader_thread_pool)
 926                 {
 927                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 928                 image_loader_prio_cond = g_cond_new();
 929                 image_loader_prio_mutex = g_mutex_new();
 930                 }
 931
 932         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 933
 934         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 935         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 936
 937         return TRUE;
 938 }
 939 #endif /* HAVE_GTHREAD */
 940
 941
 942 /**************************************************************************************/
 943 /* public interface */
 944
 945
 946 gboolean image_loader_start(ImageLoader *il)
 947 {
 948         if (!il) return FALSE;
 949
 950         if (!il->fd) return FALSE;
 951
 952 #ifdef HAVE_GTHREAD
 953         return image_loader_start_thread(il);
 954 #else
 955         return image_loader_start_idle(il);
 956 #endif
 957 }
 958
 959
 960 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 961 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 962 {
 963         GdkPixbuf *ret;
 964         if (!il) return NULL;
 965
 966         g_mutex_lock(il->data_mutex);
 967         ret = il->pixbuf;
 968         g_mutex_unlock(il->data_mutex);
 969         return ret;
 970 }
 971
 972 gchar *image_loader_get_format(ImageLoader *il)
 973 {
 974         gchar **mimev;
 975         gchar *mime;
 976
 977         if (!il || !il->loader) return NULL;
 978
 979         mimev = il->backend.get_format_mime_types(il->loader);
 980         if (!mimev) return NULL;
 981
 982         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 983         mime = g_strdup(mimev[0]);
 984         g_strfreev(mimev);
 985
 986         return mime;
 987 }
 988
 989 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 990 {
 991         if (!il) return;
 992
 993         g_mutex_lock(il->data_mutex);
 994         il->requested_width = width;
 995         il->requested_height = height;
 996         g_mutex_unlock(il->data_mutex);
 997 }
 998
 999 void image_loader_set_buffer_size(ImageLoader *il, guint count)
1000 {
1001         if (!il) return;
1002
1003         g_mutex_lock(il->data_mutex);
1004         il->idle_read_loop_count = count ? count : 1;
1005         g_mutex_unlock(il->data_mutex);
1006 }
1007
1008 void image_loader_set_priority(ImageLoader *il, gint priority)
1009 {
1010         if (!il) return;
1011
1012         if (il->thread) return; /* can't change prio if the thread already runs */
1013         il->idle_priority = priority;
1014 }
1015
1016
1017 gdouble image_loader_get_percent(ImageLoader *il)
1018 {
1019         gdouble ret;
1020         if (!il) return 0.0;
1021
1022         g_mutex_lock(il->data_mutex);
1023         if (il->bytes_total == 0)
1024                 {
1025                 ret = 0.0;
1026                 }
1027         else
1028                 {
1029                 ret = (gdouble)il->bytes_read / il->bytes_total;
1030                 }
1031         g_mutex_unlock(il->data_mutex);
1032         return ret;
1033 }
1034
1035 gboolean image_loader_get_is_done(ImageLoader *il)
1036 {
1037         gboolean ret;
1038         if (!il) return FALSE;
1039
1040         g_mutex_lock(il->data_mutex);
1041         ret = il->done;
1042         g_mutex_unlock(il->data_mutex);
1043
1044         return ret;
1045 }
1046
1047 FileData *image_loader_get_fd(ImageLoader *il)
1048 {
1049         FileData *ret;
1050         if (!il) return NULL;
1051
1052         g_mutex_lock(il->data_mutex);
1053         ret = il->fd;
1054         g_mutex_unlock(il->data_mutex);
1055
1056         return ret;
1057 }
1058
1059 gboolean image_loader_get_shrunk(ImageLoader *il)
1060 {
1061         gboolean ret;
1062         if (!il) return FALSE;
1063
1064         g_mutex_lock(il->data_mutex);
1065         ret = il->shrunk;
1066         g_mutex_unlock(il->data_mutex);
1067         return ret;
1068 }
1069
1070 const gchar *image_loader_get_error(ImageLoader *il)
1071 {
1072         const gchar *ret = NULL;
1073         if (!il) return NULL;
1074         g_mutex_lock(il->data_mutex);
1075         if (il->error) ret = il->error->message;
1076         g_mutex_unlock(il->data_mutex);
1077         return ret;
1078 }
1079
1080
1081 /* FIXME - this can be rather slow and blocks until the size is known */
1082 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1083 {
1084         ImageLoader *il;
1085         gboolean success;
1086
1087         il = image_loader_new(fd);
1088
1089         success = image_loader_start_idle(il);
1090
1091         if (success && il->pixbuf)
1092                 {
1093                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1094                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1095                 }
1096         else
1097                 {
1098                 if (width) *width = -1;
1099                 if (height) *height = -1;
1100                 }
1101
1102         image_loader_free(il);
1103
1104         return success;
1105 }
1106 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */