src/Tools/pixbuf-cache.c

   1 /* Gnome Music Player Client (GMPC)
   2  * Copyright (C) 2004-2012 Qball Cow <qball@gmpclient.org>
   3  * Project homepage: http://gmpclient.org/
   4
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include <strings.h>
  24 #include <glib.h>
  25 #include <gdk/gdk.h>
  26 #include "pixbuf-cache.h"
  27
  28 #define LOG_DOMAIN "PixbufCache"
  29
  30 /* The hash table looking up the entries */
  31 static GHashTable *pb_cache = NULL;
  32 guint32 total_size = 0;
  33 #define MAX_SIZE 500
  34
  35 /* The structure holding the cache entry */
  36 typedef struct
  37 {
  38     const gchar *key;
  39     GdkPixbuf *pb;
  40     time_t last_used;
  41     gboolean in_use;
  42 } DCE;
  43 static guint timeout = 0;
  44
  45
  46 const int sizes[] = {
  47     32, // Small
  48     48, // Default
  49     80, // Large
  50     250, // Browser
  51     500 // Tooltip
  52 };
  53
  54 int pixbuf_cache_get_closest_size(int size)
  55 {
  56     int i = 0;
  57     for(;i<NUM_COVER_SIZES;i++)
  58     {
  59         if(size <= sizes[i]) return sizes[i];
  60     }
  61     return sizes[NUM_COVER_SIZES-1];
  62 }
  63
  64
  65
  66 /* Creates a new cache entry */
  67 static DCE *create_cache_entry(void)
  68 {
  69     DCE *e = g_slice_new(DCE);
  70     total_size+=sizeof(DCE);
  71     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG,"pixbuf-cache size: %u\n", total_size);
  72
  73     e->last_used = time(NULL);
  74     return e;
  75 }
  76
  77 static gboolean pixbuf_cache_timeout_passed(void)
  78 {
  79     GHashTableIter iter;
  80     gchar *key;
  81     DCE *e;
  82     GList *liter, *list = NULL;
  83     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Pixbuf cache timeout passed\n");
  84     g_hash_table_iter_init(&iter, pb_cache);
  85     while (g_hash_table_iter_next(&iter, (gpointer) & key, (gpointer) & e))
  86     {
  87         /* do something with key and value */
  88         if (e->in_use == FALSE)
  89         {
  90             list = g_list_prepend(list, (gpointer) e->key);
  91         }
  92     }
  93     for (liter = g_list_first(list); liter; liter = g_list_next(liter))
  94     {
  95         g_hash_table_remove(pb_cache, (gchar *) liter->data);
  96     }
  97     g_list_free(list);
  98     timeout = 0;
  99     return FALSE;
 100 }
 101
 102 /* Called when the pixbuf looses it last entry */
 103 static void pixbuf_cache_entry_toggle_ref(const gchar * key, GdkPixbuf * pb, gboolean is_last_ref)
 104 {
 105     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Toggle Reference called: %i:%s", is_last_ref, key);
 106     if (is_last_ref)
 107     {
 108         DCE *e = g_hash_table_lookup(pb_cache, key);
 109         if (e)
 110             e->in_use = FALSE;
 111         if (timeout > 0)
 112             g_source_remove(timeout);
 113         g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "set 10 seconds timeout\n");
 114         timeout = g_timeout_add_seconds(10, (GSourceFunc) pixbuf_cache_timeout_passed, NULL);
 115     }
 116 }
 117
 118 /* Destroy cache entry */
 119 static void destroy_cache_entry(DCE * entry)
 120 {
 121     g_return_if_fail(entry != NULL);
 122     g_object_remove_toggle_ref(G_OBJECT(entry->pb), (GToggleNotify) pixbuf_cache_entry_toggle_ref,
 123                                (gpointer) entry->key);
 124     g_slice_free(DCE, entry);
 125     total_size-=sizeof(DCE);
 126     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "%i: Destroy cache entry: %p size: %u", g_hash_table_size(pb_cache) - 1, entry,total_size);
 127 }
 128
 129 void pixbuf_cache_create(void)
 130 {
 131     g_assert(pb_cache == NULL);
 132
 133     pb_cache = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, (GDestroyNotify) destroy_cache_entry);
 134
 135     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Create pixbuf cache");
 136
 137 }
 138
 139 void pixbuf_cache_destroy(void)
 140 {
 141     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Destroy pixbuf cache");
 142     if (timeout > 0)
 143         g_source_remove(timeout);
 144     timeout = 0;
 145     g_hash_table_destroy(pb_cache);
 146     pb_cache = NULL;
 147     g_log(LOG_DOMAIN, G_LOG_LEVEL_DEBUG,"remaining size: %u\n", total_size);
 148 }
 149
 150 void pixbuf_cache_clear(void)
 151 {
 152     pixbuf_cache_destroy();
 153     pixbuf_cache_create();
 154 }
 155
 156 void pixbuf_cache_add_icon(int size, const gchar * url, GdkPixbuf * pb)
 157 {
 158     int *mdd= (int *)url;
 159     gchar *key;
 160     g_assert(pb_cache != NULL);
 161     if(size > MAX_SIZE) return;
 162
 163     key = g_strdup_printf("%i:%X%X%X%X", size,
 164             mdd[0],
 165             mdd[1],
 166             mdd[2],
 167             mdd[3]
 168             );
 169
 170     if (g_hash_table_lookup(pb_cache, key) == NULL)
 171     {
 172         DCE *e = create_cache_entry();
 173         e->key = key;
 174         e->pb = pb;
 175         e->in_use = TRUE;
 176         g_object_add_toggle_ref(G_OBJECT(pb), (GToggleNotify) pixbuf_cache_entry_toggle_ref, (gpointer) key);
 177         g_hash_table_insert(pb_cache, key, e);
 178     }
 179     else g_free(key);
 180 }
 181
 182 GdkPixbuf *pixbuf_cache_lookup_icon(int size, const gchar * url)
 183 {
 184     int *mdd= (int *)url;
 185     gchar *key = g_strdup_printf("%i:%X%X%X%X", size,
 186             mdd[0],
 187             mdd[1],
 188             mdd[2],
 189             mdd[3]
 190             );
 191     DCE *retv = NULL;
 192     retv = g_hash_table_lookup(pb_cache, key);
 193     g_free(key);
 194
 195     if (retv)
 196     {
 197         retv->in_use = TRUE;
 198
 199         return g_object_ref(retv->pb);
 200     }
 201     return NULL;
 202 }