src/slideshow.c

   1 /*
   2  * Geeqie
   3  * (C) 2004 John Ellis
   4  * Copyright (C) 2008 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 "collect.h"
  16 #include "image.h"
  17 #include "slideshow.h"
  18 #include "filedata.h"
  19
  20 #include "layout.h"
  21 #include "layout_image.h"
  22 #include "ui_fileops.h"
  23
  24
  25 static void slideshow_timer_stop(SlideShowData *ss);
  26
  27
  28 void slideshow_free(SlideShowData *ss)
  29 {
  30         if (!ss) return;
  31
  32         slideshow_timer_stop(ss);
  33
  34         if (ss->stop_func) ss->stop_func(ss, ss->stop_data);
  35
  36         if (ss->filelist) filelist_free(ss->filelist);
  37         if (ss->cd) collection_unref(ss->cd);
  38         file_data_unref(ss->dir_fd);
  39
  40         g_list_free(ss->list);
  41         g_list_free(ss->list_done);
  42
  43         file_data_unref(ss->slide_fd);
  44
  45         g_free(ss);
  46 }
  47
  48 static GList *generate_list(SlideShowData *ss)
  49 {
  50         GList *list = NULL;
  51
  52         if (ss->from_selection)
  53                 {
  54                 list = layout_selection_list_by_index(ss->layout);
  55                 }
  56         else
  57                 {
  58                 guint i;
  59                 for (i = 0; i < ss->slide_count; i++)
  60                         {
  61                         list = g_list_prepend(list, GINT_TO_POINTER(i));
  62                         }
  63                 list = g_list_reverse(list);
  64                 }
  65
  66         return list;
  67 }
  68
  69 static GList *generate_random_list(SlideShowData *ss)
  70 {
  71         GList *src_list = NULL;
  72         GList *list = NULL;
  73         GList *work;
  74
  75         src_list = generate_list(ss);
  76
  77         while (src_list)
  78                 {
  79                 gint p = (double)rand() / ((double)RAND_MAX + 1.0) * g_list_length(src_list);
  80                 work = g_list_nth(src_list, p);
  81                 list = g_list_prepend(list, work->data);
  82                 src_list = g_list_remove(src_list, work->data);
  83                 }
  84
  85         return list;
  86 }
  87
  88 static void slideshow_list_init(SlideShowData *ss, gint start_index)
  89 {
  90         if (ss->list_done)
  91                 {
  92                 g_list_free(ss->list_done);
  93                 ss->list_done = NULL;
  94                 }
  95
  96         if (ss->list) g_list_free(ss->list);
  97
  98         if (options->slideshow.random)
  99                 {
 100                 ss->list = generate_random_list(ss);
 101                 }
 102         else
 103                 {
 104                 ss->list = generate_list(ss);
 105                 if (start_index >= 0)
 106                         {
 107                         /* start with specified image by skipping to it */
 108                         gint i = 0;
 109
 110                         while (ss->list && i < start_index)
 111                                 {
 112                                 ss->list_done = g_list_prepend(ss->list_done, ss->list->data);
 113                                 ss->list = g_list_remove(ss->list, ss->list->data);
 114                                 i++;
 115                                 }
 116                         }
 117                 }
 118 }
 119
 120 gint slideshow_should_continue(SlideShowData *ss)
 121 {
 122         FileData *imd_fd;
 123         FileData *dir_fd;
 124
 125         if (!ss) return FALSE;
 126
 127         imd_fd = image_get_fd(ss->imd);
 128
 129         if ( ((imd_fd == NULL) != (ss->slide_fd == NULL)) ||
 130             (imd_fd && ss->slide_fd && imd_fd != ss->slide_fd) ) return FALSE;
 131
 132         if (ss->filelist) return TRUE;
 133
 134         if (ss->cd)
 135                 {
 136                 if (g_list_length(ss->cd->list) == ss->slide_count)
 137                         return TRUE;
 138                 else
 139                         return FALSE;
 140                 }
 141
 142         if (!ss->layout) return FALSE;
 143         dir_fd = ss->layout->dir_fd;
 144
 145         if (dir_fd && ss->dir_fd && dir_fd == ss->dir_fd)
 146                 {
 147                 if (ss->from_selection && ss->slide_count == layout_selection_count(ss->layout, NULL)) return TRUE;
 148                 if (!ss->from_selection && ss->slide_count == layout_list_count(ss->layout, NULL)) return TRUE;
 149                 }
 150
 151         return FALSE;
 152 }
 153
 154 static gint slideshow_step(SlideShowData *ss, gboolean forward)
 155 {
 156         gint row;
 157
 158         if (!slideshow_should_continue(ss))
 159                 {
 160                 return FALSE;
 161                 }
 162
 163         if (forward)
 164                 {
 165                 if (!ss->list) return TRUE;
 166
 167                 row = GPOINTER_TO_INT(ss->list->data);
 168                 ss->list_done = g_list_prepend(ss->list_done, ss->list->data);
 169                 ss->list = g_list_remove(ss->list, ss->list->data);
 170                 }
 171         else
 172                 {
 173                 if (!ss->list_done || !ss->list_done->next) return TRUE;
 174
 175                 ss->list = g_list_prepend(ss->list, ss->list_done->data);
 176                 ss->list_done = g_list_remove(ss->list_done, ss->list_done->data);
 177                 row = GPOINTER_TO_INT(ss->list_done->data);
 178                 }
 179
 180         file_data_unref(ss->slide_fd);
 181         ss->slide_fd = NULL;
 182
 183         if (ss->filelist)
 184                 {
 185                 ss->slide_fd = file_data_ref((FileData *)g_list_nth_data(ss->filelist, row));
 186                 image_change_fd(ss->imd, ss->slide_fd, image_zoom_get_default(ss->imd, options->image.zoom_mode));
 187                 }
 188         else if (ss->cd)
 189                 {
 190                 CollectInfo *info;
 191
 192                 info = g_list_nth_data(ss->cd->list, row);
 193                 ss->slide_fd = file_data_ref(info->fd);
 194
 195                 image_change_from_collection(ss->imd, ss->cd, info, image_zoom_get_default(ss->imd, options->image.zoom_mode));
 196                 }
 197         else
 198                 {
 199                 ss->slide_fd = file_data_ref(layout_list_get_fd(ss->layout, row));
 200
 201                 if (ss->from_selection)
 202                         {
 203                         image_change_fd(ss->imd, ss->slide_fd, image_zoom_get_default(ss->imd, options->image.zoom_mode));
 204                         layout_status_update_info(ss->layout, NULL);
 205                         }
 206                 else
 207                         {
 208                         layout_image_set_index(ss->layout, row);
 209                         }
 210                 }
 211
 212         if (!ss->list && options->slideshow.repeat)
 213                 {
 214                 slideshow_list_init(ss, -1);
 215                 }
 216
 217         if (!ss->list)
 218                 {
 219                 return FALSE;
 220                 }
 221
 222         /* read ahead */
 223
 224         if (options->image.enable_read_ahead)
 225                 {
 226                 gint r;
 227                 if (forward)
 228                         {
 229                         if (!ss->list) return TRUE;
 230                         r = GPOINTER_TO_INT(ss->list->data);
 231                         }
 232                 else
 233                         {
 234                         if (!ss->list_done || !ss->list_done->next) return TRUE;
 235                         r = GPOINTER_TO_INT(ss->list_done->next->data);
 236                         }
 237
 238                 if (ss->filelist)
 239                         {
 240                         image_prebuffer_set(ss->imd, g_list_nth_data(ss->filelist, r));
 241                         }
 242                 else if (ss->cd)
 243                         {
 244                         CollectInfo *info;
 245                         info = g_list_nth_data(ss->cd->list, r);
 246                         if (info) image_prebuffer_set(ss->imd, info->fd);
 247                         }
 248                 else if (ss->from_selection)
 249                         {
 250                         image_prebuffer_set(ss->imd, layout_list_get_fd(ss->layout, r));
 251                         }
 252                 }
 253
 254         return TRUE;
 255 }
 256
 257 static gint slideshow_loop_cb(gpointer data)
 258 {
 259         SlideShowData *ss = data;
 260
 261         if (ss->paused) return TRUE;
 262
 263         if (!slideshow_step(ss, TRUE))
 264                 {
 265                 ss->timeout_id = -1;
 266                 slideshow_free(ss);
 267                 return FALSE;
 268                 }
 269
 270         return TRUE;
 271 }
 272
 273 static void slideshow_timer_stop(SlideShowData *ss)
 274 {
 275         if (ss->timeout_id == -1) return;
 276
 277         g_source_remove(ss->timeout_id);
 278         ss->timeout_id = -1;
 279 }
 280
 281 static void slideshow_timer_reset(SlideShowData *ss)
 282 {
 283         if (options->slideshow.delay < 1) options->slideshow.delay = 1;
 284
 285         if (ss->timeout_id != -1) g_source_remove(ss->timeout_id);
 286         ss->timeout_id = g_timeout_add(options->slideshow.delay * 1000 / SLIDESHOW_SUBSECOND_PRECISION,
 287                                        slideshow_loop_cb, ss);
 288 }
 289
 290 static void slideshow_move(SlideShowData *ss, gboolean forward)
 291 {
 292         if (!ss) return;
 293
 294         if (!slideshow_step(ss, forward))
 295                 {
 296                 slideshow_free(ss);
 297                 return;
 298                 }
 299
 300         slideshow_timer_reset(ss);
 301 }
 302
 303 void slideshow_next(SlideShowData *ss)
 304 {
 305         slideshow_move(ss, TRUE);
 306 }
 307
 308 void slideshow_prev(SlideShowData *ss)
 309 {
 310         slideshow_move(ss, FALSE);
 311 }
 312
 313 static SlideShowData *real_slideshow_start(ImageWindow *imd, LayoutWindow *lw,
 314                                            GList *filelist, gint start_point,
 315                                            CollectionData *cd, CollectInfo *start_info,
 316                                            void (*stop_func)(SlideShowData *, gpointer), gpointer stop_data)
 317 {
 318         SlideShowData *ss;
 319         gint start_index = -1;
 320
 321         if (!filelist && !cd && layout_list_count(lw, NULL) < 1) return NULL;
 322
 323         ss = g_new0(SlideShowData, 1);
 324
 325         ss->imd = imd;
 326
 327         ss->filelist = filelist;
 328         ss->cd = cd;
 329         ss->layout = lw;
 330         ss->dir_fd = NULL;
 331
 332         ss->list = NULL;
 333         ss->list_done = NULL;
 334
 335         ss->from_selection = FALSE;
 336
 337         ss->stop_func = NULL;
 338
 339         ss->timeout_id = -1;
 340         ss->paused = FALSE;
 341
 342         if (ss->filelist)
 343                 {
 344                 ss->slide_count = g_list_length(ss->filelist);
 345                 }
 346         else if (ss->cd)
 347                 {
 348                 collection_ref(ss->cd);
 349                 ss->slide_count = g_list_length(ss->cd->list);
 350                 if (!options->slideshow.random && start_info)
 351                         {
 352                         start_index = g_list_index(ss->cd->list, start_info);
 353                         }
 354                 }
 355         else
 356                 {
 357                 /* layout method */
 358
 359                 ss->slide_count = layout_selection_count(ss->layout, NULL);
 360                 ss->dir_fd = file_data_ref(ss->layout->dir_fd);
 361                 if (ss->slide_count < 2)
 362                         {
 363                         ss->slide_count = layout_list_count(ss->layout, NULL);
 364                         if (!options->slideshow.random && start_point >= 0 && (guint) start_point < ss->slide_count)
 365                                 {
 366                                 start_index = start_point;
 367                                 }
 368                         }
 369                 else
 370                         {
 371                         ss->from_selection = TRUE;
 372                         }
 373                 }
 374
 375         slideshow_list_init(ss, start_index);
 376
 377         ss->slide_fd = file_data_ref(image_get_fd(ss->imd));
 378         if (slideshow_step(ss, TRUE))
 379                 {
 380                 slideshow_timer_reset(ss);
 381
 382                 ss->stop_func = stop_func;
 383                 ss->stop_data = stop_data;
 384                 }
 385         else
 386                 {
 387                 slideshow_free(ss);
 388                 ss = NULL;
 389                 }
 390
 391         return ss;
 392 }
 393
 394 SlideShowData *slideshow_start_from_filelist(ImageWindow *imd, GList *list,
 395                                               void (*stop_func)(SlideShowData *, gpointer), gpointer stop_data)
 396 {
 397         return real_slideshow_start(imd, NULL, list, -1, NULL, NULL, stop_func, stop_data);
 398 }
 399
 400 SlideShowData *slideshow_start_from_collection(ImageWindow *imd, CollectionData *cd,
 401                                                void (*stop_func)(SlideShowData *, gpointer), gpointer stop_data,
 402                                                CollectInfo *start_info)
 403 {
 404         return real_slideshow_start(imd, NULL, NULL, -1, cd, start_info, stop_func, stop_data);
 405 }
 406
 407 SlideShowData *slideshow_start(ImageWindow *imd, LayoutWindow *lw, gint start_point,
 408                                void (*stop_func)(SlideShowData *, gpointer), gpointer stop_data)
 409 {
 410         return real_slideshow_start(imd, lw, NULL, start_point, NULL, NULL, stop_func, stop_data);
 411 }
 412
 413 gint slideshow_paused(SlideShowData *ss)
 414 {
 415         if (!ss) return FALSE;
 416
 417         return ss->paused;
 418 }
 419
 420 void slideshow_pause_set(SlideShowData *ss, gint paused)
 421 {
 422         if (!ss) return;
 423
 424         ss->paused = paused;
 425 }
 426
 427 gint slideshow_pause_toggle(SlideShowData *ss)
 428 {
 429         slideshow_pause_set(ss, !slideshow_paused(ss));
 430         return slideshow_paused(ss);
 431 }