demos/spiv/image_loader.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23 #include <errno.h>
  24
  25 #include <core/GP_Pixmap.h>
  26 #include <core/GP_Debug.h>
  27
  28 #include <loaders/GP_Loaders.h>
  29
  30 #include "cpu_timer.h"
  31 #include "image_cache.h"
  32 #include "image_list.h"
  33 #include "image_loader.h"
  34
  35 static struct image_cache *img_cache;
  36 static struct image_list *img_list;
  37 static GP_Pixmap *cur_img;
  38 static GP_DataStorage *cur_meta_data;
  39 static GP_Container *cur_cont;
  40
  41 int image_loader_init(const char *args[], unsigned int cache_max_bytes)
  42 {
  43         img_cache = image_cache_create(cache_max_bytes);
  44
  45         if (!img_cache) {
  46                 GP_WARN("Failed to initialize image cache (size=%u)",
  47                         cache_max_bytes);
  48         }
  49
  50         img_list = image_list_create(args);
  51
  52         if (!img_list) {
  53                 GP_FATAL("Failed to initialize image list");
  54                 return 1;
  55         }
  56
  57         return 0;
  58 }
  59
  60 GP_Pixmap *image_loader_get_image(GP_ProgressCallback *callback, int elevate)
  61 {
  62         struct cpu_timer timer;
  63         const char *path;
  64         GP_Pixmap *img;
  65         int err, ret;
  66
  67         if (cur_img)
  68                 return cur_img;
  69
  70         if (cur_cont) {
  71                 cpu_timer_start(&timer, "Loading");
  72                 cur_meta_data = GP_DataStorageCreate();
  73                 GP_ContainerLoadEx(cur_cont, &cur_img, cur_meta_data, callback);
  74                 cpu_timer_stop(&timer);
  75                 return cur_img;
  76         }
  77
  78         path = image_list_img_path(img_list);
  79
  80         if (!image_cache_get(img_cache, &cur_img, &cur_meta_data, elevate, path))
  81                 return cur_img;
  82
  83         cpu_timer_start(&timer, "Loading");
  84
  85         cur_meta_data = GP_DataStorageCreate();
  86
  87         ret = GP_LoadImageEx(path, &img, cur_meta_data, callback);
  88
  89         if (ret) {
  90                 err = errno;
  91
  92                 /*
  93                  * Try containers, ZIP for now, more to come
  94                  *
  95                  * TODO: How to cache container content?
  96                  */
  97                 cur_cont = GP_OpenZip(path);
  98
  99                 if (cur_cont) {
 100                         GP_ContainerLoadEx(cur_cont, &img, cur_meta_data, callback);
 101
 102                         if (img) {
 103                                 cur_img = img;
 104                                 cpu_timer_stop(&timer);
 105                                 return img;
 106                         }
 107
 108                         GP_ContainerClose(cur_cont);
 109                         cur_cont = NULL;
 110                 }
 111
 112                 errno = err;
 113                 return NULL;
 114         }
 115
 116         image_cache_put(img_cache, img, cur_meta_data, path);
 117
 118         cpu_timer_stop(&timer);
 119
 120         return img;
 121 }
 122
 123 GP_DataStorage *image_loader_get_meta_data(void)
 124 {
 125         return cur_meta_data;
 126 }
 127
 128 const char *image_loader_img_path(void)
 129 {
 130         //TODO: Make this more elegant
 131         static char path[512];
 132
 133         if (cur_cont) {
 134                 snprintf(path, sizeof(path), "%s:%u",
 135                          image_list_img_path(img_list), cur_cont->cur_img);
 136                 return path;
 137         }
 138
 139         return image_list_img_path(img_list);
 140 }
 141
 142 const char *image_loader_img_name(void)
 143 {
 144         return image_list_img_path(img_list);
 145 }
 146
 147 static void drop_cur_img(void)
 148 {
 149         const char *path;
 150
 151         path = image_list_img_path(img_list);
 152
 153         /*
 154          * Currently loaded image is too big to be cached -> free it.
 155          */
 156         if (image_cache_get(img_cache, NULL, NULL, 0, path)) {
 157                 GP_PixmapFree(cur_img);
 158                 GP_DataStorageDestroy(cur_meta_data);
 159         }
 160
 161         cur_img = NULL;
 162         cur_meta_data = NULL;
 163 }
 164
 165 void image_loader_seek(enum img_seek_offset offset, int whence)
 166 {
 167         drop_cur_img();
 168
 169         if (cur_cont) {
 170                 switch (offset) {
 171                 case IMG_FIRST:
 172                 case IMG_LAST:
 173                 //TODO  do something better for IMG_DIR
 174                 case IMG_DIR:
 175                         GP_ContainerClose(cur_cont);
 176                         cur_cont = NULL;
 177                         goto list_seek;
 178                 case IMG_CUR:
 179                 break;
 180                 }
 181                 /*
 182                  * TODO: We should be able to count how much
 183                  *       we get out of the container and seek
 184                  *       N images in the list
 185                  *
 186                  *       What about wrapping around?
 187                  */
 188                 if (GP_ContainerSeek(cur_cont, whence, GP_CONT_CUR)) {
 189                         GP_ContainerClose(cur_cont);
 190                         cur_cont = NULL;
 191                         goto list_seek;
 192                 }
 193
 194                 return;
 195         }
 196
 197 list_seek:
 198
 199         switch (offset) {
 200         case IMG_FIRST:
 201                 image_list_first(img_list);
 202         break;
 203         case IMG_LAST:
 204                 image_list_last(img_list);
 205         break;
 206         case IMG_CUR:
 207         break;
 208         case IMG_DIR:
 209                 image_list_dir_move(img_list, whence);
 210                 return;
 211         }
 212
 213         if (!whence)
 214                 return;
 215
 216         image_list_move(img_list, whence);
 217 }
 218
 219 unsigned int image_loader_count(void)
 220 {
 221         return image_list_count(img_list);
 222 }
 223
 224 unsigned int image_loader_pos(void)
 225 {
 226         return image_list_pos(img_list);
 227 }
 228
 229 int image_loader_is_in_dir(void)
 230 {
 231         return image_list_dir_count(img_list) != 0;
 232 }
 233
 234 unsigned int image_loader_dir_count(void)
 235 {
 236         return image_list_dir_count(img_list);
 237 }
 238
 239 unsigned int image_loader_dir_pos(void)
 240 {
 241         return image_list_dir_pos(img_list);
 242 }
 243
 244 void image_loader_drop_cache(void)
 245 {
 246         drop_cur_img();
 247         image_cache_drop(img_cache);
 248 }
 249
 250 void image_loader_destroy(void)
 251 {
 252         GP_DEBUG(1, "Destroying loader");
 253         drop_cur_img();
 254         GP_DEBUG(1, "Destroying cache");
 255         image_cache_destroy(img_cache);
 256         GP_DEBUG(1, "Destroying image list");
 257         image_list_destroy(img_list);
 258 }