src/image-load.c

   1 /*
   2  * Copyright (C) 2004 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * Author: John Ellis
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "main.h"
  23 #include "image-load.h"
  24 #include "image_load_gdk.h"
  25 #include "image_load_jpeg.h"
  26 #include "image_load_tiff.h"
  27 #include "image_load_dds.h"
  28 #include "image_load_djvu.h"
  29 #include "image_load_pdf.h"
  30 #include "image_load_heif.h"
  31 #include "image_load_ffmpegthumbnailer.h"
  32 #include "image_load_collection.h"
  33 #include "image_load_webp.h"
  34
  35 #include "exif.h"
  36 #include "filedata.h"
  37 #include "ui_fileops.h"
  38 #include "gq-marshal.h"
  39
  40 #include <fcntl.h>
  41 #include <sys/mman.h>
  42
  43 #define IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT   4096
  44 #define IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT       1
  45
  46
  47 /**************************************************************************************/
  48 /* image loader class */
  49
  50
  51 enum {
  52         SIGNAL_AREA_READY = 0,
  53         SIGNAL_ERROR,
  54         SIGNAL_DONE,
  55         SIGNAL_PERCENT,
  56         SIGNAL_SIZE,
  57         SIGNAL_COUNT
  58 };
  59
  60 static guint signals[SIGNAL_COUNT] = { 0 };
  61
  62 static void image_loader_init(GTypeInstance *instance, gpointer g_class);
  63 static void image_loader_class_init(ImageLoaderClass *class);
  64 static void image_loader_finalize(GObject *object);
  65 static void image_loader_stop(ImageLoader *il);
  66
  67 GType image_loader_get_type(void)
  68 {
  69         static GType type = 0;
  70         if (type == 0)
  71                 {
  72                 static const GTypeInfo info = {
  73                         sizeof(ImageLoaderClass),
  74                         NULL,   /* base_init */
  75                         NULL,   /* base_finalize */
  76                         (GClassInitFunc)image_loader_class_init, /* class_init */
  77                         NULL,   /* class_finalize */
  78                         NULL,   /* class_data */
  79                         sizeof(ImageLoader),
  80                         0,      /* n_preallocs */
  81                         (GInstanceInitFunc)image_loader_init, /* instance_init */
  82                         NULL    /* value_table */
  83                         };
  84                 type = g_type_register_static(G_TYPE_OBJECT, "ImageLoaderType", &info, 0);
  85                 }
  86         return type;
  87 }
  88
  89 static void image_loader_init(GTypeInstance *instance, gpointer g_class)
  90 {
  91         ImageLoader *il = (ImageLoader *)instance;
  92
  93         il->pixbuf = NULL;
  94         il->idle_id = 0;
  95         il->idle_priority = G_PRIORITY_DEFAULT_IDLE;
  96         il->done = FALSE;
  97         il->loader = NULL;
  98
  99         il->bytes_read = 0;
 100         il->bytes_total = 0;
 101
 102         il->idle_done_id = 0;
 103
 104         il->idle_read_loop_count = IMAGE_LOADER_IDLE_READ_LOOP_COUNT_DEFAULT;
 105         il->read_buffer_size = IMAGE_LOADER_READ_BUFFER_SIZE_DEFAULT;
 106         il->mapped_file = NULL;
 107
 108         il->requested_width = 0;
 109         il->requested_height = 0;
 110         il->actual_width = 0;
 111         il->actual_height = 0;
 112         il->shrunk = FALSE;
 113
 114         il->can_destroy = TRUE;
 115
 116 #ifdef HAVE_GTHREAD
 117 #if GLIB_CHECK_VERSION(2,32,0)
 118         il->data_mutex = g_new(GMutex, 1);
 119         g_mutex_init(il->data_mutex);
 120         il->can_destroy_cond = g_new(GCond, 1);
 121         g_cond_init(il->can_destroy_cond);
 122 #else
 123         il->data_mutex = g_mutex_new();
 124         il->can_destroy_cond = g_cond_new();
 125 #endif
 126 #endif
 127         DEBUG_1("new image loader %p, bufsize=%" G_GSIZE_FORMAT " idle_loop=%u", il, il->read_buffer_size, il->idle_read_loop_count);
 128 }
 129
 130 static void image_loader_class_init(ImageLoaderClass *class)
 131 {
 132         GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 133
 134 //      gobject_class->set_property = image_loader_set_property;
 135 //      gobject_class->get_property = image_loader_get_property;
 136
 137         gobject_class->finalize = image_loader_finalize;
 138
 139
 140         signals[SIGNAL_AREA_READY] =
 141                 g_signal_new("area_ready",
 142                              G_OBJECT_CLASS_TYPE(gobject_class),
 143                              G_SIGNAL_RUN_LAST,
 144                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 145                              NULL, NULL,
 146                              gq_marshal_VOID__INT_INT_INT_INT,
 147                              G_TYPE_NONE, 4,
 148                              G_TYPE_INT,
 149                              G_TYPE_INT,
 150                              G_TYPE_INT,
 151                              G_TYPE_INT);
 152
 153         signals[SIGNAL_ERROR] =
 154                 g_signal_new("error",
 155                              G_OBJECT_CLASS_TYPE(gobject_class),
 156                              G_SIGNAL_RUN_LAST,
 157                              G_STRUCT_OFFSET(ImageLoaderClass, error),
 158                              NULL, NULL,
 159                              g_cclosure_marshal_VOID__VOID,
 160                              G_TYPE_NONE, 0);
 161
 162         signals[SIGNAL_DONE] =
 163                 g_signal_new("done",
 164                              G_OBJECT_CLASS_TYPE(gobject_class),
 165                              G_SIGNAL_RUN_LAST,
 166                              G_STRUCT_OFFSET(ImageLoaderClass, done),
 167                              NULL, NULL,
 168                              g_cclosure_marshal_VOID__VOID,
 169                              G_TYPE_NONE, 0);
 170
 171         signals[SIGNAL_PERCENT] =
 172                 g_signal_new("percent",
 173                              G_OBJECT_CLASS_TYPE(gobject_class),
 174                              G_SIGNAL_RUN_LAST,
 175                              G_STRUCT_OFFSET(ImageLoaderClass, percent),
 176                              NULL, NULL,
 177                              g_cclosure_marshal_VOID__DOUBLE,
 178                              G_TYPE_NONE, 1,
 179                              G_TYPE_DOUBLE);
 180
 181         signals[SIGNAL_SIZE] =
 182                 g_signal_new("size_prepared",
 183                              G_OBJECT_CLASS_TYPE(gobject_class),
 184                              G_SIGNAL_RUN_LAST,
 185                              G_STRUCT_OFFSET(ImageLoaderClass, area_ready),
 186                              NULL, NULL,
 187                              gq_marshal_VOID__INT_INT,
 188                              G_TYPE_NONE, 2,
 189                              G_TYPE_INT,
 190                              G_TYPE_INT);
 191
 192 }
 193
 194 static void image_loader_finalize(GObject *object)
 195 {
 196         ImageLoader *il = (ImageLoader *)object;
 197
 198         image_loader_stop(il);
 199
 200         if (il->error) DEBUG_1("%s", image_loader_get_error(il));
 201
 202         DEBUG_1("freeing image loader %p bytes_read=%" G_GSIZE_FORMAT, il, il->bytes_read);
 203
 204         if (il->idle_done_id)
 205                 {
 206                 g_source_remove(il->idle_done_id);
 207                 il->idle_done_id = 0;
 208                 }
 209
 210         while (g_source_remove_by_user_data(il))
 211                 {
 212                 DEBUG_2("pending signals detected");
 213                 }
 214
 215         while (il->area_param_list)
 216                 {
 217                 DEBUG_1("pending area_ready signals detected");
 218                 while (g_source_remove_by_user_data(il->area_param_list->data)) {}
 219                 g_free(il->area_param_list->data);
 220                 il->area_param_list = g_list_delete_link(il->area_param_list, il->area_param_list);
 221                 }
 222
 223         while (il->area_param_delayed_list)
 224                 {
 225                 g_free(il->area_param_delayed_list->data);
 226                 il->area_param_delayed_list = g_list_delete_link(il->area_param_delayed_list, il->area_param_delayed_list);
 227                 }
 228
 229         if (il->pixbuf) g_object_unref(il->pixbuf);
 230
 231         if (il->error) g_error_free(il->error);
 232
 233         file_data_unref(il->fd);
 234 #ifdef HAVE_GTHREAD
 235 #if GLIB_CHECK_VERSION(2,32,0)
 236         g_mutex_clear(il->data_mutex);
 237         g_free(il->data_mutex);
 238         g_cond_clear(il->can_destroy_cond);
 239         g_free(il->can_destroy_cond);
 240 #else
 241         g_mutex_free(il->data_mutex);
 242         g_cond_free(il->can_destroy_cond);
 243 #endif
 244 #endif
 245 }
 246
 247 void image_loader_free(ImageLoader *il)
 248 {
 249         if (!il) return;
 250         g_object_unref(G_OBJECT(il));
 251 }
 252
 253
 254 ImageLoader *image_loader_new(FileData *fd)
 255 {
 256         ImageLoader *il;
 257
 258         if (!fd) return NULL;
 259
 260         il = (ImageLoader *) g_object_new(TYPE_IMAGE_LOADER, NULL);
 261
 262         il->fd = file_data_ref(fd);
 263
 264         return il;
 265 }
 266
 267 /**************************************************************************************/
 268 /* send signals via idle calbacks - the callback are executed in the main thread */
 269
 270 typedef struct _ImageLoaderAreaParam ImageLoaderAreaParam;
 271 struct _ImageLoaderAreaParam {
 272         ImageLoader *il;
 273         guint x;
 274         guint y;
 275         guint w;
 276         guint h;
 277 };
 278
 279
 280 static gboolean image_loader_emit_area_ready_cb(gpointer data)
 281 {
 282         ImageLoaderAreaParam *par = data;
 283         ImageLoader *il = par->il;
 284         guint x, y, w, h;
 285         g_mutex_lock(il->data_mutex);
 286         il->area_param_list = g_list_remove(il->area_param_list, par);
 287         x = par->x;
 288         y = par->y;
 289         w = par->w;
 290         h = par->h;
 291         g_free(par);
 292         g_mutex_unlock(il->data_mutex);
 293
 294         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, x, y, w, h);
 295
 296         return FALSE;
 297 }
 298
 299 static gboolean image_loader_emit_done_cb(gpointer data)
 300 {
 301         ImageLoader *il = data;
 302         g_signal_emit(il, signals[SIGNAL_DONE], 0);
 303         return FALSE;
 304 }
 305
 306 static gboolean image_loader_emit_error_cb(gpointer data)
 307 {
 308         ImageLoader *il = data;
 309         g_signal_emit(il, signals[SIGNAL_ERROR], 0);
 310         return FALSE;
 311 }
 312
 313 static gboolean image_loader_emit_percent_cb(gpointer data)
 314 {
 315         ImageLoader *il = data;
 316         g_signal_emit(il, signals[SIGNAL_PERCENT], 0, image_loader_get_percent(il));
 317         return FALSE;
 318 }
 319
 320 static gboolean image_loader_emit_size_cb(gpointer data)
 321 {
 322         gint width, height;
 323         ImageLoader *il = data;
 324         g_mutex_lock(il->data_mutex);
 325         width = il->actual_width;
 326         height = il->actual_height;
 327         g_mutex_unlock(il->data_mutex);
 328         g_signal_emit(il, signals[SIGNAL_SIZE], 0, width, height);
 329         return FALSE;
 330 }
 331
 332
 333 /* DONE and ERROR are emited only once, thus they can have normal priority
 334    PERCENT and AREA_READY should be processed ASAP
 335 */
 336
 337 static void image_loader_emit_done(ImageLoader *il)
 338 {
 339         g_idle_add_full(il->idle_priority, image_loader_emit_done_cb, il, NULL);
 340 }
 341
 342 static void image_loader_emit_error(ImageLoader *il)
 343 {
 344         g_idle_add_full(il->idle_priority, image_loader_emit_error_cb, il, NULL);
 345 }
 346
 347 static void image_loader_emit_percent(ImageLoader *il)
 348 {
 349         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_percent_cb, il, NULL);
 350 }
 351
 352 static void image_loader_emit_size(ImageLoader *il)
 353 {
 354         g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_size_cb, il, NULL);
 355 }
 356
 357 static ImageLoaderAreaParam *image_loader_queue_area_ready(ImageLoader *il, GList **list, guint x, guint y, guint w, guint h)
 358 {
 359         if (*list)
 360                 {
 361                 ImageLoaderAreaParam *prev_par = (*list)->data;
 362                 if (prev_par->x == x && prev_par->w == w &&
 363                     prev_par->y + prev_par->h == y)
 364                         {
 365                         /* we can merge the notifications */
 366                         prev_par->h += h;
 367                         return NULL;
 368                         }
 369                 if (prev_par->x == x && prev_par->w == w &&
 370                     y + h == prev_par->y)
 371                         {
 372                         /* we can merge the notifications */
 373                         prev_par->h += h;
 374                         prev_par->y = y;
 375                         return NULL;
 376                         }
 377                 if (prev_par->y == y && prev_par->h == h &&
 378                     prev_par->x + prev_par->w == x)
 379                         {
 380                         /* we can merge the notifications */
 381                         prev_par->w += w;
 382                         return NULL;
 383                         }
 384                 if (prev_par->y == y && prev_par->h == h &&
 385                     x + w == prev_par->x)
 386                         {
 387                         /* we can merge the notifications */
 388                         prev_par->w += w;
 389                         prev_par->x = x;
 390                         return NULL;
 391                         }
 392                 }
 393
 394         ImageLoaderAreaParam *par = g_new0(ImageLoaderAreaParam, 1);
 395         par->il = il;
 396         par->x = x;
 397         par->y = y;
 398         par->w = w;
 399         par->h = h;
 400
 401         *list = g_list_prepend(*list, par);
 402         return par;
 403 }
 404
 405 /* this function expects that il->data_mutex is locked by caller */
 406 static void image_loader_emit_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 407 {
 408         ImageLoaderAreaParam *par = image_loader_queue_area_ready(il, &il->area_param_list, x, y, w, h);
 409
 410         if (par)
 411                 {
 412                 g_idle_add_full(G_PRIORITY_HIGH, image_loader_emit_area_ready_cb, par, NULL);
 413                 }
 414 }
 415
 416 /**************************************************************************************/
 417 /* the following functions may be executed in separate thread */
 418
 419 /* this function expects that il->data_mutex is locked by caller */
 420 static void image_loader_queue_delayed_area_ready(ImageLoader *il, guint x, guint y, guint w, guint h)
 421 {
 422         image_loader_queue_area_ready(il, &il->area_param_delayed_list, x, y, w, h);
 423 }
 424
 425
 426
 427 static gboolean image_loader_get_stopping(ImageLoader *il)
 428 {
 429         gboolean ret;
 430         if (!il) return FALSE;
 431
 432         g_mutex_lock(il->data_mutex);
 433         ret = il->stopping;
 434         g_mutex_unlock(il->data_mutex);
 435
 436         return ret;
 437 }
 438
 439
 440 static void image_loader_sync_pixbuf(ImageLoader *il)
 441 {
 442         GdkPixbuf *pb;
 443
 444         g_mutex_lock(il->data_mutex);
 445
 446         if (!il->loader)
 447                 {
 448                 g_mutex_unlock(il->data_mutex);
 449                 return;
 450                 }
 451
 452         pb = il->backend.get_pixbuf(il->loader);
 453
 454         if (pb == il->pixbuf)
 455                 {
 456                 g_mutex_unlock(il->data_mutex);
 457                 return;
 458                 }
 459
 460         if (g_ascii_strcasecmp(".jps", il->fd->extension) == 0)
 461                 {
 462                 g_object_set_data(G_OBJECT(pb), "stereo_data", GINT_TO_POINTER(STEREO_PIXBUF_CROSS));
 463                 }
 464
 465         if (il->pixbuf) g_object_unref(il->pixbuf);
 466
 467         il->pixbuf = pb;
 468         if (il->pixbuf) g_object_ref(il->pixbuf);
 469
 470         g_mutex_unlock(il->data_mutex);
 471 }
 472
 473 static void image_loader_area_updated_cb(gpointer loader,
 474                                  guint x, guint y, guint w, guint h,
 475                                  gpointer data)
 476 {
 477         ImageLoader *il = data;
 478
 479         if (!image_loader_get_pixbuf(il))
 480                 {
 481                 image_loader_sync_pixbuf(il);
 482                 if (!image_loader_get_pixbuf(il))
 483                         {
 484                         log_printf("critical: area_ready signal with NULL pixbuf (out of mem?)\n");
 485                         }
 486                 }
 487
 488         g_mutex_lock(il->data_mutex);
 489         if (il->delay_area_ready)
 490                 image_loader_queue_delayed_area_ready(il, x, y, w, h);
 491         else
 492                 image_loader_emit_area_ready(il, x, y, w, h);
 493
 494         if (il->stopping) il->backend.abort(il->loader);
 495
 496         g_mutex_unlock(il->data_mutex);
 497 }
 498
 499 static void image_loader_area_prepared_cb(gpointer loader, gpointer data)
 500 {
 501         ImageLoader *il = data;
 502         GdkPixbuf *pb;
 503         guchar *pix;
 504         size_t h, rs;
 505
 506         /* a workaround for
 507            http://bugzilla.gnome.org/show_bug.cgi?id=547669
 508            http://bugzilla.gnome.org/show_bug.cgi?id=589334
 509         */
 510         gchar *format = il->backend.get_format_name(loader);
 511         if (strcmp(format, "svg") == 0 ||
 512             strcmp(format, "xpm") == 0)
 513                 {
 514                 g_free(format);
 515                 return;
 516                 }
 517
 518         g_free(format);
 519
 520         pb = il->backend.get_pixbuf(loader);
 521
 522         h = gdk_pixbuf_get_height(pb);
 523         rs = gdk_pixbuf_get_rowstride(pb);
 524         pix = gdk_pixbuf_get_pixels(pb);
 525
 526         memset(pix, 0, rs * h); /*this should be faster than pixbuf_fill */
 527
 528 }
 529
 530 static void image_loader_size_cb(gpointer loader,
 531                                  gint width, gint height, gpointer data)
 532 {
 533         ImageLoader *il = data;
 534         gchar **mime_types;
 535         gboolean scale = FALSE;
 536         gint n;
 537
 538         g_mutex_lock(il->data_mutex);
 539         il->actual_width = width;
 540         il->actual_height = height;
 541         if (il->requested_width < 1 || il->requested_height < 1)
 542                 {
 543                 g_mutex_unlock(il->data_mutex);
 544                 image_loader_emit_size(il);
 545                 return;
 546                 }
 547         g_mutex_unlock(il->data_mutex);
 548
 549 #ifdef HAVE_FFMPEGTHUMBNAILER
 550         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 551                 scale = TRUE;
 552 #endif
 553         mime_types = il->backend.get_format_mime_types(loader);
 554         n = 0;
 555         while (mime_types[n] && !scale)
 556                 {
 557                 if (strstr(mime_types[n], "jpeg")) scale = TRUE;
 558                 n++;
 559                 }
 560         g_strfreev(mime_types);
 561
 562         if (!scale)
 563                 {
 564                 image_loader_emit_size(il);
 565                 return;
 566                 }
 567
 568         g_mutex_lock(il->data_mutex);
 569
 570         gint nw, nh;
 571         if (width > il->requested_width || height > il->requested_height)
 572                 {
 573
 574                 if (((gdouble)il->requested_width / width) < ((gdouble)il->requested_height / height))
 575                         {
 576                         nw = il->requested_width;
 577                         nh = (gdouble)nw / width * height;
 578                         if (nh < 1) nh = 1;
 579                         }
 580                 else
 581                         {
 582                         nh = il->requested_height;
 583                         nw = (gdouble)nh / height * width;
 584                         if (nw < 1) nw = 1;
 585                         }
 586
 587                 il->actual_width = nw;
 588                 il->actual_height = nh;
 589                 il->backend.set_size(loader, nw, nh);
 590                 il->shrunk = TRUE;
 591                 }
 592
 593         g_mutex_unlock(il->data_mutex);
 594         image_loader_emit_size(il);
 595 }
 596
 597 static void image_loader_stop_loader(ImageLoader *il)
 598 {
 599         if (!il) return;
 600
 601         if (il->loader)
 602                 {
 603                 /* some loaders do not have a pixbuf till close, order is important here */
 604                 il->backend.close(il->loader, il->error ? NULL : &il->error); /* we are interested in the first error only */
 605                 image_loader_sync_pixbuf(il);
 606                 il->backend.free(il->loader);
 607                 il->loader = NULL;
 608                 }
 609         g_mutex_lock(il->data_mutex);
 610         il->done = TRUE;
 611         g_mutex_unlock(il->data_mutex);
 612 }
 613
 614 static void image_loader_setup_loader(ImageLoader *il)
 615 {
 616         gchar *format;
 617
 618         g_mutex_lock(il->data_mutex);
 619 #ifdef HAVE_FFMPEGTHUMBNAILER
 620         if (il->fd->format_class == FORMAT_CLASS_VIDEO)
 621                 {
 622                 DEBUG_1("Using custom ffmpegthumbnailer loader");
 623                 image_loader_backend_set_ft(&il->backend);
 624                 }
 625         else
 626 #endif
 627 #ifdef HAVE_PDF
 628         if (il->bytes_total >= 4 &&
 629             (memcmp(il->mapped_file + 0, "%PDF", 4) == 0))
 630                 {
 631                 DEBUG_1("Using custom pdf loader");
 632                 image_loader_backend_set_pdf(&il->backend);
 633                 }
 634         else
 635 #endif
 636 #ifdef HAVE_HEIF
 637         if (il->bytes_total >= 10 &&
 638             (memcmp(il->mapped_file + 4, "ftypheic", 8) == 0))
 639                 {
 640                 DEBUG_1("Using custom heif loader");
 641                 image_loader_backend_set_heif(&il->backend);
 642                 }
 643         else
 644 #endif
 645 #ifdef HAVE_WEBP
 646         if (il->bytes_total >= 12 &&
 647                 (memcmp(il->mapped_file, "RIFF", 4) == 0) &&
 648                 (memcmp(il->mapped_file + 8, "WEBP", 4) == 0))
 649                 {
 650                 DEBUG_1("Using custom webp loader");
 651                 image_loader_backend_set_webp(&il->backend);
 652                 }
 653         else
 654 #endif
 655 #ifdef HAVE_DJVU
 656         if (il->bytes_total >= 16 &&
 657                 (memcmp(il->mapped_file, "AT&TFORM", 8) == 0) &&
 658                 (memcmp(il->mapped_file + 12, "DJV", 3) == 0))
 659                 {
 660                 DEBUG_1("Using custom djvu loader");
 661                 image_loader_backend_set_djvu(&il->backend);
 662                 }
 663         else
 664 #endif
 665 #ifdef HAVE_JPEG
 666         if (il->bytes_total >= 2 && il->mapped_file[0] == 0xff && il->mapped_file[1] == 0xd8)
 667                 {
 668                 DEBUG_1("Using custom jpeg loader");
 669                 image_loader_backend_set_jpeg(&il->backend);
 670                 }
 671         else
 672 #endif
 673 #ifdef HAVE_TIFF
 674         if (il->bytes_total >= 10 &&
 675             (memcmp(il->mapped_file, "MM\0*", 4) == 0 ||
 676              memcmp(il->mapped_file, "MM\0+\0\x08\0\0", 8) == 0 ||
 677              memcmp(il->mapped_file, "II+\0\x08\0\0\0", 8) == 0 ||
 678              memcmp(il->mapped_file, "II*\0", 4) == 0))
 679                 {
 680                 DEBUG_1("Using custom tiff loader");
 681                 image_loader_backend_set_tiff(&il->backend);
 682                 }
 683         else
 684 #endif
 685         if (il->bytes_total >= 3 && il->mapped_file[0] == 0x44 && il->mapped_file[1] == 0x44 && il->mapped_file[2] == 0x53)
 686                 {
 687                 DEBUG_1("Using dds loader");
 688                 image_loader_backend_set_dds(&il->backend);
 689                 }
 690         else
 691         if (il->fd->format_class == FORMAT_CLASS_COLLECTION)
 692                 {
 693                 DEBUG_1("Using custom collection loader");
 694                 image_loader_backend_set_collection(&il->backend);
 695                 }
 696         else
 697                 image_loader_backend_set_default(&il->backend);
 698
 699         il->loader = il->backend.loader_new(image_loader_area_updated_cb, image_loader_size_cb, image_loader_area_prepared_cb, il);
 700
 701 #ifdef HAVE_PDF
 702         format = il->backend.get_format_name(il->loader);
 703         if (g_strcmp0(format, "pdf") == 0)
 704                 {
 705                 il->backend.set_page_num(il->loader, il->fd->page_num);
 706                 }
 707         g_free(format);
 708 #endif
 709
 710 #ifdef HAVE_DJVU
 711         format = il->backend.get_format_name(il->loader);
 712         if (g_strcmp0(format, "djvu") == 0)
 713                 {
 714                 il->backend.set_page_num(il->loader, il->fd->page_num);
 715                 }
 716         g_free(format);
 717 #endif
 718
 719         g_mutex_unlock(il->data_mutex);
 720 }
 721
 722
 723 static void image_loader_done(ImageLoader *il)
 724 {
 725         image_loader_stop_loader(il);
 726
 727         image_loader_emit_done(il);
 728 }
 729
 730 static void image_loader_error(ImageLoader *il)
 731 {
 732         image_loader_stop_loader(il);
 733
 734         DEBUG_1("pixbuf_loader reported load error for: %s", il->fd->path);
 735
 736         image_loader_emit_error(il);
 737 }
 738
 739 static gboolean image_loader_continue(ImageLoader *il)
 740 {
 741         gint b;
 742         gint c;
 743
 744         if (!il) return FALSE;
 745
 746         c = il->idle_read_loop_count ? il->idle_read_loop_count : 1;
 747         while (c > 0 && !image_loader_get_stopping(il))
 748                 {
 749                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 750
 751                 if (b == 0)
 752                         {
 753                         image_loader_done(il);
 754                         return FALSE;
 755                         }
 756
 757                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 758                         {
 759                         image_loader_error(il);
 760                         return FALSE;
 761                         }
 762
 763                 il->bytes_read += b;
 764
 765                 c--;
 766                 }
 767
 768         if (il->bytes_total > 0)
 769                 {
 770                 image_loader_emit_percent(il);
 771                 }
 772
 773         return TRUE;
 774 }
 775
 776 static gboolean image_loader_begin(ImageLoader *il)
 777 {
 778         gssize b;
 779         gchar *format;
 780
 781         if (il->pixbuf) return FALSE;
 782
 783         b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 784         if (b < 1) return FALSE;
 785
 786         image_loader_setup_loader(il);
 787
 788         g_assert(il->bytes_read == 0);
 789         if (il->backend.load) {
 790                 b = il->bytes_total;
 791                 if (!il->backend.load(il->loader, il->mapped_file, b, &il->error))
 792                         {
 793                         image_loader_stop_loader(il);
 794                         return FALSE;
 795                         }
 796         }
 797         else if (!il->backend.write(il->loader, il->mapped_file, b, &il->error))
 798                 {
 799                 image_loader_stop_loader(il);
 800                 return FALSE;
 801                 }
 802
 803 #ifdef HAVE_PDF
 804         format = il->backend.get_format_name(il->loader);
 805         if (g_strcmp0(format, "pdf") == 0)
 806                 {
 807                 gint i = il->backend.get_page_total(il->loader);
 808                 file_data_set_page_total(il->fd, i);
 809                 }
 810         g_free(format);
 811 #endif
 812 #ifdef HAVE_DJVU
 813         format = il->backend.get_format_name(il->loader);
 814         if (g_strcmp0(format, "djvu") == 0)
 815                 {
 816                 gint i = il->backend.get_page_total(il->loader);
 817                 file_data_set_page_total(il->fd, i);
 818                 }
 819         g_free(format);
 820 #endif
 821
 822         il->bytes_read += b;
 823
 824         /* read until size is known */
 825         while (il->loader && !il->backend.get_pixbuf(il->loader) && b > 0 && !image_loader_get_stopping(il))
 826                 {
 827                 b = MIN(il->read_buffer_size, il->bytes_total - il->bytes_read);
 828                 if (b < 0 || (b > 0 && !il->backend.write(il->loader, il->mapped_file + il->bytes_read, b, &il->error)))
 829                         {
 830                         image_loader_stop_loader(il);
 831                         return FALSE;
 832                         }
 833                 il->bytes_read += b;
 834                 }
 835         if (!il->pixbuf) image_loader_sync_pixbuf(il);
 836
 837         if (il->bytes_read == il->bytes_total || b < 1)
 838                 {
 839                 /* done, handle (broken) loaders that do not have pixbuf till close */
 840                 image_loader_stop_loader(il);
 841
 842                 if (!il->pixbuf) return FALSE;
 843
 844                 image_loader_done(il);
 845                 return TRUE;
 846                 }
 847
 848         if (!il->pixbuf)
 849                 {
 850                 image_loader_stop_loader(il);
 851                 return FALSE;
 852                 }
 853
 854         return TRUE;
 855 }
 856
 857 /**************************************************************************************/
 858 /* the following functions are always executed in the main thread */
 859
 860
 861 static gboolean image_loader_setup_source(ImageLoader *il)
 862 {
 863         struct stat st;
 864         gchar *pathl;
 865
 866         if (!il || il->loader || il->mapped_file) return FALSE;
 867
 868         il->mapped_file = NULL;
 869
 870         if (il->fd)
 871                 {
 872                 ExifData *exif = exif_read_fd(il->fd);
 873
 874                 if (options->thumbnails.use_exif)
 875                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, il->requested_width, il->requested_height);
 876                 else
 877                         il->mapped_file = exif_get_preview(exif, (guint *)&il->bytes_total, 0, 0); /* get the largest available preview image or NULL for normal images*/
 878
 879                 if (il->mapped_file)
 880                         {
 881                         il->preview = TRUE;
 882                         DEBUG_1("Usable reduced size (preview) image loaded from file %s", il->fd->path);
 883                         }
 884                 exif_free_fd(il->fd, exif);
 885                 }
 886
 887
 888         if (!il->mapped_file)
 889                 {
 890                 /* normal file */
 891                 gint load_fd;
 892
 893                 pathl = path_from_utf8(il->fd->path);
 894                 load_fd = open(pathl, O_RDONLY | O_NONBLOCK);
 895                 g_free(pathl);
 896                 if (load_fd == -1) return FALSE;
 897
 898                 if (fstat(load_fd, &st) == 0)
 899                         {
 900                         il->bytes_total = st.st_size;
 901                         }
 902                 else
 903                         {
 904                         close(load_fd);
 905                         return FALSE;
 906                         }
 907
 908                 il->mapped_file = mmap(0, il->bytes_total, PROT_READ|PROT_WRITE, MAP_PRIVATE, load_fd, 0);
 909                 close(load_fd);
 910                 if (il->mapped_file == MAP_FAILED)
 911                         {
 912                         il->mapped_file = 0;
 913                         return FALSE;
 914                         }
 915                 il->preview = FALSE;
 916                 }
 917
 918         return TRUE;
 919 }
 920
 921 static void image_loader_stop_source(ImageLoader *il)
 922 {
 923         if (!il) return;
 924
 925         if (il->mapped_file)
 926                 {
 927                 if (il->preview)
 928                         {
 929                         exif_free_preview(il->mapped_file);
 930                         }
 931                 else
 932                         {
 933                         munmap(il->mapped_file, il->bytes_total);
 934                         }
 935                 il->mapped_file = NULL;
 936                 }
 937 }
 938
 939 static void image_loader_stop(ImageLoader *il)
 940 {
 941         if (!il) return;
 942
 943         if (il->idle_id)
 944                 {
 945                 g_source_remove(il->idle_id);
 946                 il->idle_id = 0;
 947                 }
 948
 949         if (il->thread)
 950                 {
 951                 /* stop loader in the other thread */
 952                 g_mutex_lock(il->data_mutex);
 953                 il->stopping = TRUE;
 954                 while (!il->can_destroy) g_cond_wait(il->can_destroy_cond, il->data_mutex);
 955                 g_mutex_unlock(il->data_mutex);
 956                 }
 957
 958         image_loader_stop_loader(il);
 959         image_loader_stop_source(il);
 960
 961 }
 962
 963 void image_loader_delay_area_ready(ImageLoader *il, gboolean enable)
 964 {
 965         g_mutex_lock(il->data_mutex);
 966         il->delay_area_ready = enable;
 967         if (!enable)
 968                 {
 969                 /* send delayed */
 970                 GList *list, *work;
 971                 list = g_list_reverse(il->area_param_delayed_list);
 972                 il->area_param_delayed_list = NULL;
 973                 g_mutex_unlock(il->data_mutex);
 974
 975                 work = list;
 976
 977                 while (work)
 978                         {
 979                         ImageLoaderAreaParam *par = work->data;
 980                         work = work->next;
 981
 982                         g_signal_emit(il, signals[SIGNAL_AREA_READY], 0, par->x, par->y, par->w, par->h);
 983                         g_free(par);
 984                         }
 985                 g_list_free(list);
 986                 }
 987         else
 988                 {
 989                 /* just unlock */
 990                 g_mutex_unlock(il->data_mutex);
 991                 }
 992 }
 993
 994
 995 /**************************************************************************************/
 996 /* execution via idle calls */
 997
 998 static gboolean image_loader_idle_cb(gpointer data)
 999 {
1000         gboolean ret = FALSE;
1001         ImageLoader *il = data;
1002
1003         if (il->idle_id)
1004                 {
1005                 ret = image_loader_continue(il);
1006                 }
1007
1008         if (!ret)
1009                 {
1010                 image_loader_stop_source(il);
1011                 }
1012
1013         return ret;
1014 }
1015
1016
1017 static gboolean image_loader_start_idle(ImageLoader *il)
1018 {
1019         gboolean ret;
1020
1021         if (!il) return FALSE;
1022
1023         if (!il->fd) return FALSE;
1024
1025         if (!image_loader_setup_source(il)) return FALSE;
1026
1027         ret = image_loader_begin(il);
1028
1029         if (ret && !il->done) il->idle_id = g_idle_add_full(il->idle_priority, image_loader_idle_cb, il, NULL);
1030         return ret;
1031 }
1032
1033 /**************************************************************************************/
1034 /* execution via thread */
1035
1036 #ifdef HAVE_GTHREAD
1037 static GThreadPool *image_loader_thread_pool = NULL;
1038
1039 static GCond *image_loader_prio_cond = NULL;
1040 static GMutex *image_loader_prio_mutex = NULL;
1041 static gint image_loader_prio_num = 0;
1042
1043
1044 static void image_loader_thread_enter_high(void)
1045 {
1046         g_mutex_lock(image_loader_prio_mutex);
1047         image_loader_prio_num++;
1048         g_mutex_unlock(image_loader_prio_mutex);
1049 }
1050
1051 static void image_loader_thread_leave_high(void)
1052 {
1053         g_mutex_lock(image_loader_prio_mutex);
1054         image_loader_prio_num--;
1055         if (image_loader_prio_num == 0) g_cond_broadcast(image_loader_prio_cond); /* wake up all low prio threads */
1056         g_mutex_unlock(image_loader_prio_mutex);
1057 }
1058
1059 static void image_loader_thread_wait_high(void)
1060 {
1061         g_mutex_lock(image_loader_prio_mutex);
1062         while (image_loader_prio_num)
1063                 {
1064                 g_cond_wait(image_loader_prio_cond, image_loader_prio_mutex);
1065                 }
1066
1067         g_mutex_unlock(image_loader_prio_mutex);
1068 }
1069
1070
1071 static void image_loader_thread_run(gpointer data, gpointer user_data)
1072 {
1073         ImageLoader *il = data;
1074         gboolean cont;
1075         gboolean err;
1076
1077         if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1078                 {
1079                 /* low prio, wait untill high prio tasks finishes */
1080                 image_loader_thread_wait_high();
1081                 }
1082         else
1083                 {
1084                 /* high prio */
1085                 image_loader_thread_enter_high();
1086                 }
1087
1088         err = !image_loader_begin(il);
1089
1090         if (err)
1091                 {
1092                 /*
1093                 loader failed, we have to send signal
1094                 (idle mode returns the image_loader_begin return value directly)
1095                 (success is always reported indirectly from image_loader_begin)
1096                 */
1097                 image_loader_emit_error(il);
1098                 }
1099
1100         cont = !err;
1101
1102         while (cont && !image_loader_get_is_done(il) && !image_loader_get_stopping(il))
1103                 {
1104                 if (il->idle_priority > G_PRIORITY_DEFAULT_IDLE)
1105                         {
1106                         /* low prio, wait untill high prio tasks finishes */
1107                         image_loader_thread_wait_high();
1108                         }
1109                 cont = image_loader_continue(il);
1110                 }
1111         image_loader_stop_loader(il);
1112
1113         if (il->idle_priority <= G_PRIORITY_DEFAULT_IDLE)
1114                 {
1115                 /* high prio */
1116                 image_loader_thread_leave_high();
1117                 }
1118
1119         g_mutex_lock(il->data_mutex);
1120         il->can_destroy = TRUE;
1121         g_cond_signal(il->can_destroy_cond);
1122         g_mutex_unlock(il->data_mutex);
1123
1124 }
1125
1126
1127 static gboolean image_loader_start_thread(ImageLoader *il)
1128 {
1129         if (!il) return FALSE;
1130
1131         if (!il->fd) return FALSE;
1132
1133         il->thread = TRUE;
1134
1135         if (!image_loader_setup_source(il)) return FALSE;
1136
1137         if (!image_loader_thread_pool)
1138                 {
1139                 image_loader_thread_pool = g_thread_pool_new(image_loader_thread_run, NULL, -1, FALSE, NULL);
1140 #if GLIB_CHECK_VERSION(2,32,0)
1141                 if (!image_loader_prio_cond) image_loader_prio_cond = g_new(GCond, 1);
1142                 g_cond_init(image_loader_prio_cond);
1143                 if (!image_loader_prio_mutex) image_loader_prio_mutex = g_new(GMutex, 1);
1144                 g_mutex_init(image_loader_prio_mutex);
1145 #else
1146                 image_loader_prio_cond = g_cond_new();
1147                 image_loader_prio_mutex = g_mutex_new();
1148 #endif
1149                 }
1150
1151         il->can_destroy = FALSE; /* ImageLoader can't be freed until image_loader_thread_run finishes */
1152
1153         g_thread_pool_push(image_loader_thread_pool, il, NULL);
1154         DEBUG_1("Thread pool num threads: %d", g_thread_pool_get_num_threads(image_loader_thread_pool));
1155
1156         return TRUE;
1157 }
1158 #endif /* HAVE_GTHREAD */
1159
1160
1161 /**************************************************************************************/
1162 /* public interface */
1163
1164
1165 gboolean image_loader_start(ImageLoader *il)
1166 {
1167         if (!il) return FALSE;
1168
1169         if (!il->fd) return FALSE;
1170
1171 #ifdef HAVE_GTHREAD
1172         return image_loader_start_thread(il);
1173 #else
1174         return image_loader_start_idle(il);
1175 #endif
1176 }
1177
1178
1179 /* don't forget to gdk_pixbuf_ref() it if you want to use it after image_loader_free() */
1180 GdkPixbuf *image_loader_get_pixbuf(ImageLoader *il)
1181 {
1182         GdkPixbuf *ret;
1183         if (!il) return NULL;
1184
1185         g_mutex_lock(il->data_mutex);
1186         ret = il->pixbuf;
1187         g_mutex_unlock(il->data_mutex);
1188         return ret;
1189 }
1190
1191 void image_loader_set_requested_size(ImageLoader *il, gint width, gint height)
1192 {
1193         if (!il) return;
1194
1195         g_mutex_lock(il->data_mutex);
1196         il->requested_width = width;
1197         il->requested_height = height;
1198         g_mutex_unlock(il->data_mutex);
1199 }
1200
1201 void image_loader_set_buffer_size(ImageLoader *il, guint count)
1202 {
1203         if (!il) return;
1204
1205         g_mutex_lock(il->data_mutex);
1206         il->idle_read_loop_count = count ? count : 1;
1207         g_mutex_unlock(il->data_mutex);
1208 }
1209
1210 void image_loader_set_priority(ImageLoader *il, gint priority)
1211 {
1212         if (!il) return;
1213
1214         if (il->thread) return; /* can't change prio if the thread already runs */
1215         il->idle_priority = priority;
1216 }
1217
1218
1219 gdouble image_loader_get_percent(ImageLoader *il)
1220 {
1221         gdouble ret;
1222         if (!il) return 0.0;
1223
1224         g_mutex_lock(il->data_mutex);
1225         if (il->bytes_total == 0)
1226                 {
1227                 ret = 0.0;
1228                 }
1229         else
1230                 {
1231                 ret = (gdouble)il->bytes_read / il->bytes_total;
1232                 }
1233         g_mutex_unlock(il->data_mutex);
1234         return ret;
1235 }
1236
1237 gboolean image_loader_get_is_done(ImageLoader *il)
1238 {
1239         gboolean ret;
1240         if (!il) return FALSE;
1241
1242         g_mutex_lock(il->data_mutex);
1243         ret = il->done;
1244         g_mutex_unlock(il->data_mutex);
1245
1246         return ret;
1247 }
1248
1249 FileData *image_loader_get_fd(ImageLoader *il)
1250 {
1251         FileData *ret;
1252         if (!il) return NULL;
1253
1254         g_mutex_lock(il->data_mutex);
1255         ret = il->fd;
1256         g_mutex_unlock(il->data_mutex);
1257
1258         return ret;
1259 }
1260
1261 gboolean image_loader_get_shrunk(ImageLoader *il)
1262 {
1263         gboolean ret;
1264         if (!il) return FALSE;
1265
1266         g_mutex_lock(il->data_mutex);
1267         ret = il->shrunk;
1268         g_mutex_unlock(il->data_mutex);
1269         return ret;
1270 }
1271
1272 const gchar *image_loader_get_error(ImageLoader *il)
1273 {
1274         const gchar *ret = NULL;
1275         if (!il) return NULL;
1276         g_mutex_lock(il->data_mutex);
1277         if (il->error) ret = il->error->message;
1278         g_mutex_unlock(il->data_mutex);
1279         return ret;
1280 }
1281
1282
1283 /* FIXME - this can be rather slow and blocks until the size is known */
1284 gboolean image_load_dimensions(FileData *fd, gint *width, gint *height)
1285 {
1286         ImageLoader *il;
1287         gboolean success;
1288
1289         il = image_loader_new(fd);
1290
1291         success = image_loader_start_idle(il);
1292
1293         if (success && il->pixbuf)
1294                 {
1295                 if (width) *width = gdk_pixbuf_get_width(il->pixbuf);
1296                 if (height) *height = gdk_pixbuf_get_height(il->pixbuf);;
1297                 }
1298         else
1299                 {
1300                 if (width) *width = -1;
1301                 if (height) *height = -1;
1302                 }
1303
1304         image_loader_free(il);
1305
1306         return success;
1307 }
1308 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */