src/image-load.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 - 2009 The Geeqie Team
   5  *
   6  * Author: John Ellis
   7  *
   8  * This software is released under the GNU General Public License (GNU GPL).
   9  * Please read the included file COPYING for more information.
  10  * This software comes with no warranty of any kind, use at your own risk!
  11  */
  12
  13
  14 #include "main.h"
  15 #include "image-load.h"
  16
  17 #include "exif.h"
  18 #include "filedata.h"
  19 #include "ui_fileops.h"
  20 #include "gq-marshal.h"
  21
  22 #include <fcntl.h>
  23 #include <sys/mman.h>
  24
  25
  26 /**************************************************************************************/
  27 /* image loader class */
  28
  29
  30 enum {
  31         SIGNAL_AREA_READY = 0,
  32         SIGNAL_ERROR,
  33         SIGNAL_DONE,
  34         SIGNAL_PERCENT,
  35         SIGNAL_COUNT
  36 };
  37
  38 static guint signals[SIGNAL_COUNT] = { 0 };
  39
  40 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
  41 static void image_loader_class_init(ImageLoaderClass *class);
  42 static void image_loader_finalize(GObject *object);
  43 static void image_loader_stop(ImageLoader *il);
  44
  45 GType image_loader_get_type(void)
  46 {
  47         static GType type = 0;
  48         if (type == 0)
  49                 {
  50                 static const GTypeInfo info = {
  51                         sizeof(ImageLoaderClass),
  52                         NULL,   /* base_init */
  53                         NULL,   /* base_finalize */
  54                         (GClassInitFunc)image_loader_class_init, /* class_init */
  55                         NULL,   /* class_finalize */
  56                         NULL,   /* class_data */
  57                         sizeof(ImageLoader),
  58                         0,      /* n_preallocs */
  59                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  60                         NULL    /* value_table */
  61                         };
  62                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  63                 }
  64         return type;
  65 }
  66
  67 static void image_loader_init(GTypeInstance *instance, gpointer g_class)
  68 {
  69         ImageLoader *il = (ImageLoader *)instance;
  70
  71         il->pixbuf = NULL;
  72         il->idle_id = -1;
  73         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  74         il->done = FALSE;
  75         il->loader = NULL;
  76
  77         il->bytes_read = 0;
  78         il->bytes_total = 0;
  79
  80         il->idle_done_id = -1;
  81
  82         il->idle_read_loop_count = options->image.idle_read_loop_count;
  83         il->read_buffer_size = options->image.read_buffer_size;
  84         il->mapped_file = NULL;
  85
  86         il->requested_width = 0;
  87         il->requested_height = 0;
  88         il->shrunk = FALSE;
  89
  90         il->can_destroy = TRUE;
  91
  92 #ifdef HAVE_GTHREAD
  93         il->data_mutex = g_mutex_new();
  94         il->can_destroy_cond = g_cond_new();
  95 #endif
  96         DEBUG_1("new image loader %p, bufsize=%u idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
  97 }
  98
  99 static void image_loader_class_init(ImageLoaderClass *class)
 100 {
 101         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 102
 103 //      gobject_class->set_property = image_loader_set_property;
 104 //      gobject_class->get_property = image_loader_get_property;
 105
 106         gobject_class->finalize = image_loader_finalize;
 107
 108
 109         signals[SIGNAL_AREA_READY] =
 110                 g_signal_new("area_ready",
 111                              G_OBJECT_CLASS_TYPE(gobject_class),
 112                              G_SIGNAL_RUN_LAST,
 113                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 114                              NULL, NULL,
 115                              gq_marshal_VOID__INT_INT_INT_INT,
 116                              G_TYPE_NONE, 4,
 117                              G_TYPE_INT,
 118                              G_TYPE_INT,
 119                              G_TYPE_INT,
 120                              G_TYPE_INT);
 121
 122         signals[SIGNAL_ERROR] =
 123                 g_signal_new("error",
 124                              G_OBJECT_CLASS_TYPE(gobject_class),
 125                              G_SIGNAL_RUN_LAST,
 126                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 127                              NULL, NULL,
 128                              g_cclosure_marshal_VOID__VOID,
 129                              G_TYPE_NONE, 0);
 130
 131         signals[SIGNAL_DONE] =
 132                 g_signal_new("done",
 133                              G_OBJECT_CLASS_TYPE(gobject_class),
 134                              G_SIGNAL_RUN_LAST,
 135                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 136                              NULL, NULL,
 137                              g_cclosure_marshal_VOID__VOID,
 138                              G_TYPE_NONE, 0);
 139
 140         signals[SIGNAL_PERCENT] =
 141                 g_signal_new("percent",
 142                              G_OBJECT_CLASS_TYPE(gobject_class),
 143                              G_SIGNAL_RUN_LAST,
 144                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 145                              NULL, NULL,
 146                              g_cclosure_marshal_VOID__DOUBLE,
 147                              G_TYPE_NONE, 1,
 148                              G_TYPE_DOUBLE);
 149
 150 }
 151
 152 static void image_loader_finalize(GObject *object)
 153 {
 154         ImageLoader *il = (ImageLoader *)object;
 155
 156         image_loader_stop(il);
 157
 158         DEBUG_1("freeing image loader %p bytes_read=%d", il, il->bytes_read);
 159
 160         if (il->idle_done_id != -1) g_source_remove(il->idle_done_id);
 161
 162         while (g_source_remove_by_user_data(il))
 163                 {
 164                 DEBUG_1("pending signals detected");
 165                 }
 166
 167         while (il->area_param_list)
 168                 {
 169                 DEBUG_1("pending area_ready signals detected");
 170                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 171                 g_free(il->area_param_list->data);
 172                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 173                 }
 174
 175         while (il->area_param_delayed_list)
 176                 {
 177                 g_free(il->area_param_delayed_list->data);
 178                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 179                 }
 180
 181         if (il->pixbuf) g_object_unref(il->pixbuf);
 182
 183         file_data_unref(il->fd);
 184 #ifdef HAVE_GTHREAD
 185         g_mutex_free(il->data_mutex);
 186         g_cond_free(il->can_destroy_cond);
 187 #endif
 188 }
 189
 190 void image_loader_free(ImageLoader *il)
 191 {
 192         if (!il) return;
 193         g_object_unref(G_OBJECT(il));
 194 }
 195
 196
 197 ImageLoader *image_loader_new(FileData *fd)
 198 {
 199         ImageLoader *il;
 200
 201         if (!fd) return NULL;
 202
 203         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 204
 205         il->fd = file_data_ref(fd);
 206
 207         return il;
 208 }
 209
 210 /**************************************************************************************/
 211 /* send signals via idle calbacks - the callback are executed in the main thread */
 212
 213 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 214 struct _ImageLoaderAreaParam {
 215         ImageLoader *il;
 216         guint x;
 217         guint y;
 218         guint w;
 219         guint h;
 220 };
 221
 222
 223 static gint image_loader_emit_area_ready_cb(gpointer data)
 224 {
 225         ImageLoaderAreaParam *par = data;
 226         ImageLoader *il = par->il;
 227         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 228         g_mutex_lock(il->data_mutex);
 229         il->area_param_list = g_list_remove(il->area_param_list, par);
 230         g_free(par);
 231         g_mutex_unlock(il->data_mutex);
 232
 233         return FALSE;
 234 }
 235
 236 static gint image_loader_emit_done_cb(gpointer data)
 237 {
 238         ImageLoader *il = data;
 239         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 240         return FALSE;
 241 }
 242
 243 static gint image_loader_emit_error_cb(gpointer data)
 244 {
 245         ImageLoader *il = data;
 246         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 247         return FALSE;
 248 }
 249
 250 static gint image_loader_emit_percent_cb(gpointer data)
 251 {
 252         ImageLoader *il = data;
 253         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 254         return FALSE;
 255 }
 256
 257 /* DONE and ERROR are emited only once, thus they can have normal priority
 258    PERCENT and AREA_READY should be processed ASAP
 259 */
 260
 261 static void image_loader_emit_done(ImageLoader *il)
 262 {
 263         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 264 }
 265
 266 static void image_loader_emit_error(ImageLoader *il)
 267 {
 268         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 269 }
 270
 271 static void image_loader_emit_percent(ImageLoader *il)
 272 {
 273         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 274 }
 275
 276 /* this function expects that il->data_mutex is locked by caller */
 277 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 278 {
 279         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 280         par->il = il;
 281         par->x = x;
 282         par->y = y;
 283         par->w = w;
 284         par->h = h;
 285
 286         il->area_param_list = g_list_prepend(il->area_param_list, par);
 287
 288         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 289 }
 290
 291 /**************************************************************************************/
 292 /* the following functions may be executed in separate thread */
 293
 294 /* this function expects that il->data_mutex is locked by caller */
 295 static void image_loader_queue_delayed_erea_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 296 {
 297         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 298         par->il = il;
 299         par->x = x;
 300         par->y = y;
 301         par->w = w;
 302         par->h = h;
 303
 304         il->area_param_delayed_list = g_list_prepend(il->area_param_delayed_list, par);
 305 }
 306
 307
 308
 309 static gint image_loader_get_stopping(ImageLoader *il)
 310 {
 311         gint ret;
 312         if (!il) return FALSE;
 313
 314         g_mutex_lock(il->data_mutex);
 315         ret = il->stopping;
 316         g_mutex_unlock(il->data_mutex);
 317
 318         return ret;
 319 }
 320
 321
 322 static void image_loader_sync_pixbuf(ImageLoader *il)
 323 {
 324         GdkPixbuf *pb;
 325
 326         g_mutex_lock(il->data_mutex);
 327
 328         if (!il->loader)
 329                 {
 330                 g_mutex_unlock(il->data_mutex);
 331                 return;
 332                 }
 333
 334         pb = gdk_pixbuf_loader_get_pixbuf(il->loader);
 335
 336         if (pb == il->pixbuf)
 337                 {
 338                 g_mutex_unlock(il->data_mutex);
 339                 return;
 340                 }
 341
 342         if (il->pixbuf) g_object_unref(il->pixbuf);
 343
 344         il->pixbuf = pb;
 345         if (il->pixbuf) g_object_ref(il->pixbuf);
 346
 347         g_mutex_unlock(il->data_mutex);
 348 }
 349
 350 static void image_loader_area_updated_cb(GdkPixbufLoader *loader,
 351                                  guint x, guint y, guint w, guint h,
 352                                  gpointer data)
 353 {
 354         ImageLoader *il = data;
 355
 356         if (!image_loader_get_pixbuf(il))
 357                 {
 358                 image_loader_sync_pixbuf(il);
 359                 if (!image_loader_get_pixbuf(il))
 360                         {
 361                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 362                         }
 363                 }
 364
 365         g_mutex_lock(il->data_mutex);
 366         if (il->delay_area_ready)
 367                 image_loader_queue_delayed_erea_ready(il, x, y, w, h);
 368         else
 369                 image_loader_emit_area_ready(il, x, y, w, h);
 370         g_mutex_unlock(il->data_mutex);
 371 }
 372
 373 static void image_loader_area_prepared_cb(GdkPixbufLoader *loader, gpointer data)
 374 {
 375         GdkPixbuf *pb;
 376         guchar *pix;
 377         size_t h, rs;
 378
 379         /* a workaround for http://bugzilla.gnome.org/show_bug.cgi?id=547669 */
 380         gchar *format = gdk_pixbuf_format_get_name(gdk_pixbuf_loader_get_format(loader));
 381         if (strcmp(format, "svg") == 0)
 382                 {
 383                 g_free(format);
 384                 return;
 385                 }
 386
 387         g_free(format);
 388
 389         pb = gdk_pixbuf_loader_get_pixbuf(loader);
 390
 391         h = gdk_pixbuf_get_height(pb);
 392         rs = gdk_pixbuf_get_rowstride(pb);
 393         pix = gdk_pixbuf_get_pixels(pb);
 394
 395         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 396
 397 }
 398
 399 static void image_loader_size_cb(GdkPixbufLoader *loader,
 400                                  gint width, gint height, gpointer data)
 401 {
 402         ImageLoader *il = data;
 403         GdkPixbufFormat *format;
 404         gchar **mime_types;
 405         gint scale = FALSE;
 406         gint n;
 407
 408         g_mutex_lock(il->data_mutex);
 409         if (il->requested_width < 1 || il->requested_height < 1)
 410                 {
 411                 g_mutex_unlock(il->data_mutex);
 412                 return;
 413                 }
 414         g_mutex_unlock(il->data_mutex);
 415
 416         format = gdk_pixbuf_loader_get_format(loader);
 417         if (!format) return;
 418
 419         mime_types = gdk_pixbuf_format_get_mime_types(format);
 420         n = 0;
 421         while (mime_types[n])
 422                 {
 423                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 424                 n++;
 425                 }
 426         g_strfreev(mime_types);
 427
 428         if (!scale) return;
 429
 430         g_mutex_lock(il->data_mutex);
 431
 432         if (width > il->requested_width || height > il->requested_height)
 433                 {
 434                 gint nw, nh;
 435
 436                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 437                         {
 438                         nw = il->requested_width;
 439                         nh = (gdouble)nw / width * height;
 440                         if (nh < 1) nh = 1;
 441                         }
 442                 else
 443                         {
 444                         nh = il->requested_height;
 445                         nw = (gdouble)nh / height * width;
 446                         if (nw < 1) nw = 1;
 447                         }
 448
 449                 gdk_pixbuf_loader_set_size(loader, nw, nh);
 450                 il->shrunk = TRUE;
 451                 }
 452         g_mutex_unlock(il->data_mutex);
 453
 454 }
 455
 456 static void image_loader_stop_loader(ImageLoader *il)
 457 {
 458         if (!il) return;
 459
 460         if (il->loader)
 461                 {
 462                 /* some loaders do not have a pixbuf till close, order is important here */
 463                 gdk_pixbuf_loader_close(il->loader, NULL);
 464                 image_loader_sync_pixbuf(il);
 465                 g_object_unref(G_OBJECT(il->loader));
 466                 il->loader = NULL;
 467                 }
 468         g_mutex_lock(il->data_mutex);
 469         il->done = TRUE;
 470         g_mutex_unlock(il->data_mutex);
 471 }
 472
 473 static void image_loader_setup_loader(ImageLoader *il)
 474 {
 475         g_mutex_lock(il->data_mutex);
 476         il->loader = gdk_pixbuf_loader_new();
 477
 478         g_signal_connect(G_OBJECT(il->loader), "area_updated",
 479                          G_CALLBACK(image_loader_area_updated_cb), il);
 480         g_signal_connect(G_OBJECT(il->loader), "size_prepared",
 481                          G_CALLBACK(image_loader_size_cb), il);
 482         g_signal_connect(G_OBJECT(il->loader), "area_prepared",
 483                          G_CALLBACK(image_loader_area_prepared_cb), il);
 484         g_mutex_unlock(il->data_mutex);
 485 }
 486
 487
 488 static void image_loader_done(ImageLoader *il)
 489 {
 490         image_loader_stop_loader(il);
 491
 492         image_loader_emit_done(il);
 493 }
 494
 495 static void image_loader_error(ImageLoader *il)
 496 {
 497         image_loader_stop_loader(il);
 498
 499         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 500
 501         image_loader_emit_error(il);
 502 }
 503
 504 static gint image_loader_continue(ImageLoader *il)
 505 {
 506         gint b;
 507         gint c;
 508
 509         if (!il) return FALSE;
 510
 511         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 512         while (c > 0 && !image_loader_get_stopping(il))
 513                 {
 514                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 515
 516                 if (b == 0)
 517                         {
 518                         image_loader_done(il);
 519                         return FALSE;
 520                         }
 521
 522                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 523                         {
 524                         image_loader_error(il);
 525                         return FALSE;
 526                         }
 527
 528                 il->bytes_read += b;
 529
 530                 c--;
 531                 }
 532
 533         if (il->bytes_total > 0)
 534                 {
 535                 image_loader_emit_percent(il);
 536                 }
 537
 538         return TRUE;
 539 }
 540
 541 static gint image_loader_begin(ImageLoader *il)
 542 {
 543         gint b;
 544
 545         if (il->pixbuf) return FALSE;
 546
 547         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 548         if (b < 1) return FALSE;
 549
 550         image_loader_setup_loader(il);
 551
 552         if (!gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL))
 553                 {
 554                 image_loader_stop_loader(il);
 555                 return FALSE;
 556                 }
 557
 558         il->bytes_read += b;
 559
 560         /* read until size is known */
 561         while (il->loader && !gdk_pixbuf_loader_get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 562                 {
 563                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 564                 if (b < 0 || (b > 0 && !gdk_pixbuf_loader_write(il->loader, il->mapped_file + il->bytes_read, b, NULL)))
 565                         {
 566                         image_loader_stop_loader(il);
 567                         return FALSE;
 568                         }
 569                 il->bytes_read += b;
 570                 }
 571         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 572
 573         if (il->bytes_read == il->bytes_total || b < 1)
 574                 {
 575                 /* done, handle (broken) loaders that do not have pixbuf till close */
 576                 image_loader_stop_loader(il);
 577
 578                 if (!il->pixbuf) return FALSE;
 579
 580                 image_loader_done(il);
 581                 return TRUE;
 582                 }
 583
 584         if (!il->pixbuf)
 585                 {
 586                 image_loader_stop_loader(il);
 587                 return FALSE;
 588                 }
 589
 590         return TRUE;
 591 }
 592
 593 /**************************************************************************************/
 594 /* the following functions are always executed in the main thread */
 595
 596
 597 static gint image_loader_setup_source(ImageLoader *il)
 598 {
 599         struct stat st;
 600         gchar *pathl;
 601
 602         if (!il || il->loader || il->mapped_file) return FALSE;
 603
 604         il->mapped_file = NULL;
 605
 606         if (il->fd)
 607                 {
 608                 ExifData *exif = exif_read_fd(il->fd);
 609
 610                 if (options->thumbnails.use_exif)
 611                         il->mapped_file = exif_get_preview(exif, &il->bytes_total, il->requested_width, il->requested_height);
 612                 else
 613                         il->mapped_file = exif_get_preview(exif, &il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 614
 615                 if (il->mapped_file)
 616                         {
 617                         il->preview = TRUE;
 618                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 619                         }
 620                 exif_free_fd(il->fd, exif);
 621                 }
 622
 623
 624         if (!il->mapped_file)
 625                 {
 626                 /* normal file */
 627                 gint load_fd;
 628
 629                 pathl = path_from_utf8(il->fd->path);
 630                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 631                 g_free(pathl);
 632                 if (load_fd == -1) return FALSE;
 633
 634                 if (fstat(load_fd, &st) == 0)
 635                         {
 636                         il->bytes_total = st.st_size;
 637                         }
 638                 else
 639                         {
 640                         close(load_fd);
 641                         return FALSE;
 642                         }
 643
 644                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 645                 close(load_fd);
 646                 if (il->mapped_file == MAP_FAILED)
 647                         {
 648                         il->mapped_file = 0;
 649                         return FALSE;
 650                         }
 651                 il->preview = FALSE;
 652                 }
 653
 654         return TRUE;
 655 }
 656
 657 static void image_loader_stop_source(ImageLoader *il)
 658 {
 659         if (!il) return;
 660
 661         if (il->mapped_file)
 662                 {
 663                 if (il->preview)
 664                         {
 665                         exif_free_preview(il->mapped_file);
 666                         }
 667                 else
 668                         {
 669                         munmap(il->mapped_file, il->bytes_total);
 670                         }
 671                 il->mapped_file = NULL;
 672                 }
 673 }
 674
 675 static void image_loader_stop(ImageLoader *il)
 676 {
 677         if (!il) return;
 678
 679         if (il->idle_id != -1)
 680                 {
 681                 g_source_remove(il->idle_id);
 682                 il->idle_id = -1;
 683                 }
 684
 685         if (il->thread)
 686                 {
 687                 /* stop loader in the other thread */
 688                 g_mutex_lock(il->data_mutex);
 689                 il->stopping = TRUE;
 690                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 691                 g_mutex_unlock(il->data_mutex);
 692                 }
 693
 694         image_loader_stop_loader(il);
 695         image_loader_stop_source(il);
 696
 697 }
 698
 699 void image_loader_delay_area_ready(ImageLoader *il, gint enable)
 700 {
 701         g_mutex_lock(il->data_mutex);
 702         il->delay_area_ready = enable;
 703         if (!enable)
 704                 {
 705                 /* send delayed */
 706                 GList *list, *work;
 707                 list = g_list_reverse(il->area_param_delayed_list);
 708                 il->area_param_delayed_list = NULL;
 709                 g_mutex_unlock(il->data_mutex);
 710
 711                 work = list;
 712
 713                 while (work)
 714                         {
 715                         ImageLoaderAreaParam *par = work->data;
 716                         work = work->next;
 717
 718                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 719                         g_free(par);
 720                         }
 721                 g_list_free(list);
 722                 }
 723         else
 724                 {
 725                 /* just unlock */
 726                 g_mutex_unlock(il->data_mutex);
 727                 }
 728 }
 729
 730
 731 /**************************************************************************************/
 732 /* execution via idle calls */
 733
 734 static gint image_loader_idle_cb(gpointer data)
 735 {
 736         gint ret = FALSE;
 737         ImageLoader *il = data;
 738         if (il->idle_id != -1)
 739                 {
 740                 ret = image_loader_continue(il);
 741                 }
 742         if (!ret)
 743                 {
 744                 image_loader_stop_source(il);
 745                 }
 746         return ret;
 747 }
 748
 749
 750 gint image_loader_start_idle(ImageLoader *il)
 751 {
 752         gint ret;
 753         if (!il) return FALSE;
 754
 755         if (!il->fd) return FALSE;
 756
 757         if (!image_loader_setup_source(il)) return FALSE;
 758
 759         ret = image_loader_begin(il);
 760
 761         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
 762         return ret;
 763 }
 764
 765 /**************************************************************************************/
 766 /* execution via thread */
 767 static GThreadPool *image_loader_thread_pool = NULL;
 768
 769 static GCond *image_loader_prio_cond = NULL;
 770 static GMutex *image_loader_prio_mutex = NULL;
 771 static gint image_loader_prio_num = 0;
 772
 773
 774 static void image_loader_thread_enter_high(void)
 775 {
 776         g_mutex_lock(image_loader_prio_mutex);
 777         image_loader_prio_num++;
 778         g_mutex_unlock(image_loader_prio_mutex);
 779 }
 780
 781 static void image_loader_thread_leave_high(void)
 782 {
 783         g_mutex_lock(image_loader_prio_mutex);
 784         image_loader_prio_num--;
 785         if (image_loader_prio_num == 0) g_cond_signal(image_loader_prio_cond);
 786         g_mutex_unlock(image_loader_prio_mutex);
 787 }
 788
 789 static void image_loader_thread_wait_high(void)
 790 {
 791         g_mutex_lock(image_loader_prio_mutex);
 792         while (image_loader_prio_num)
 793                 {
 794                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
 795                 }
 796
 797         g_mutex_unlock(image_loader_prio_mutex);
 798 }
 799
 800
 801 void image_loader_thread_run(gpointer data, gpointer user_data)
 802 {
 803         ImageLoader *il = data;
 804         gint cont;
 805
 806         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 807                 {
 808                 /* low prio, wait untill high prio tasks finishes */
 809                 image_loader_thread_wait_high();
 810                 }
 811         else
 812                 {
 813                 /* high prio */
 814                 image_loader_thread_enter_high();
 815                 }
 816
 817         cont = image_loader_begin(il);
 818
 819         if (!cont && !image_loader_get_pixbuf(il))
 820                 {
 821                 /*
 822                 loader failed, we have to send signal
 823                 (idle mode returns the image_loader_begin return value directly)
 824                 (success is always reported indirectly from image_loader_begin)
 825                 */
 826                 image_loader_emit_error(il);
 827                 }
 828
 829         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
 830                 {
 831                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
 832                         {
 833                         /* low prio, wait untill high prio tasks finishes */
 834                         image_loader_thread_wait_high();
 835                         }
 836                 cont = image_loader_continue(il);
 837                 }
 838         image_loader_stop_loader(il);
 839
 840         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
 841                 {
 842                 /* high prio */
 843                 image_loader_thread_leave_high();
 844                 }
 845
 846         g_mutex_lock(il->data_mutex);
 847         il->can_destroy = TRUE;
 848         g_cond_signal(il->can_destroy_cond);
 849         g_mutex_unlock(il->data_mutex);
 850
 851 }
 852
 853
 854 gint image_loader_start_thread(ImageLoader *il)
 855 {
 856         if (!il) return FALSE;
 857
 858         if (!il->fd) return FALSE;
 859
 860         il->thread = TRUE;
 861
 862         if (!image_loader_setup_source(il)) return FALSE;
 863
 864         if (!image_loader_thread_pool)
 865                 {
 866                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
 867                 image_loader_prio_cond = g_cond_new();
 868                 image_loader_prio_mutex = g_mutex_new();
 869                 }
 870
 871         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
 872
 873         g_thread_pool_push(image_loader_thread_pool, il, NULL);
 874         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
 875
 876         return TRUE;
 877 }
 878
 879
 880 /**************************************************************************************/
 881 /* public interface */
 882
 883
 884 gint image_loader_start(ImageLoader *il)
 885 {
 886         if (!il) return FALSE;
 887
 888         if (!il->fd) return FALSE;
 889
 890 #ifdef HAVE_GTHREAD
 891         return image_loader_start_thread(il);
 892 #else
 893         return image_loader_start_idle(il);
 894 #endif
 895 }
 896
 897
 898 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
 899 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
 900 {
 901         GdkPixbuf *ret;
 902         if (!il) return NULL;
 903
 904         g_mutex_lock(il->data_mutex);
 905         ret = il->pixbuf;
 906         g_mutex_unlock(il->data_mutex);
 907         return ret;
 908 }
 909
 910 gchar *image_loader_get_format(ImageLoader *il)
 911 {
 912         GdkPixbufFormat *format;
 913         gchar **mimev;
 914         gchar *mime;
 915
 916         if (!il || !il->loader) return NULL;
 917
 918         format = gdk_pixbuf_loader_get_format(il->loader);
 919         if (!format) return NULL;
 920
 921         mimev = gdk_pixbuf_format_get_mime_types(format);
 922         if (!mimev) return NULL;
 923
 924         /* return first member of mimev, as GdkPixbufLoader has no way to tell us which exact one ? */
 925         mime = g_strdup(mimev[0]);
 926         g_strfreev(mimev);
 927
 928         return mime;
 929 }
 930
 931 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
 932 {
 933         if (!il) return;
 934
 935         g_mutex_lock(il->data_mutex);
 936         il->requested_width = width;
 937         il->requested_height = height;
 938         g_mutex_unlock(il->data_mutex);
 939 }
 940
 941 void image_loader_set_buffer_size(ImageLoader *il, guint count)
 942 {
 943         if (!il) return;
 944
 945         g_mutex_lock(il->data_mutex);
 946         il->idle_read_loop_count = count ? count : 1;
 947         g_mutex_unlock(il->data_mutex);
 948 }
 949
 950 void image_loader_set_priority(ImageLoader *il, gint priority)
 951 {
 952         if (!il) return;
 953
 954         if (il->thread) return; /* can't change prio if the thread already runs */
 955         il->idle_priority = priority;
 956 }
 957
 958
 959 gdouble image_loader_get_percent(ImageLoader *il)
 960 {
 961         gdouble ret;
 962         if (!il) return 0.0;
 963
 964         g_mutex_lock(il->data_mutex);
 965         if (il->bytes_total == 0)
 966                 {
 967                 ret = 0.0;
 968                 }
 969         else
 970                 {
 971                 ret = (gdouble)il->bytes_read / il->bytes_total;
 972                 }
 973         g_mutex_unlock(il->data_mutex);
 974         return ret;
 975 }
 976
 977 gint image_loader_get_is_done(ImageLoader *il)
 978 {
 979         gint ret;
 980         if (!il) return FALSE;
 981
 982         g_mutex_lock(il->data_mutex);
 983         ret = il->done;
 984         g_mutex_unlock(il->data_mutex);
 985
 986         return ret;
 987 }
 988
 989 FileData *image_loader_get_fd(ImageLoader *il)
 990 {
 991         FileData *ret;
 992         if (!il) return NULL;
 993
 994         g_mutex_lock(il->data_mutex);
 995         ret = il->fd;
 996         g_mutex_unlock(il->data_mutex);
 997
 998         return ret;
 999 }
1000
1001 gint image_loader_get_shrunk(ImageLoader *il)
1002 {
1003         gint ret;
1004         if (!il) return FALSE;
1005
1006         g_mutex_lock(il->data_mutex);
1007         ret = il->shrunk;
1008         g_mutex_unlock(il->data_mutex);
1009         return ret;
1010 }
1011
1012
1013 /* FIXME - this can be rather slow and blocks until the size is known */
1014 gint image_load_dimensions(FileData *fd, gint *width, gint *height)
1015 {
1016         ImageLoader *il;
1017         gint success;
1018
1019         il = image_loader_new(fd);
1020
1021         success = image_loader_start_idle(il);
1022
1023         if (success && il->pixbuf)
1024                 {
1025                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1026                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1027                 }
1028         else
1029                 {
1030                 if (width) *width = -1;
1031                 if (height) *height = -1;
1032                 }
1033
1034         image_loader_free(il);
1035
1036         return success;
1037 }
1038 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */