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50a14534 EB |
1 | /* |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <gtk/gtk.h> | |
23 | #include <string.h> | |
24 | #include "mapcache.h" | |
25 | ||
26 | #include "config.h" | |
27 | ||
28 | typedef struct _List { | |
29 | struct _List *next; | |
30 | gchar *key; | |
31 | } List; | |
32 | ||
33 | /* a circular linked list, a pointer to the tail, and the tail points to the head */ | |
34 | /* this is so we can free the last */ | |
35 | static List *queue_tail = NULL; | |
36 | static int queue_count = 0; | |
37 | ||
50a14534 EB |
38 | static guint32 queue_size = 0; |
39 | ||
40 | ||
41 | static GHashTable *cache = NULL; | |
42 | ||
43 | #define HASHKEY_FORMAT_STRING "%d-%d-%d-%d-%d-%d-%.3f-%.3f" | |
1fe49af0 | 44 | #define HASHKEY_FORMAT_STRING_NOSHRINK_NOR_ALPHA "%d-%d-%d-%d-%d-" |
50a14534 EB |
45 | |
46 | void a_mapcache_init () | |
47 | { | |
48 | cache = g_hash_table_new_full ( g_str_hash, g_str_equal, g_free, g_object_unref ); | |
49 | } | |
50 | ||
fd4536cf QT |
51 | static void cache_add(gchar *key, GdkPixbuf *pixbuf) |
52 | { | |
53 | /* TODO: Check if already exists */ | |
54 | g_hash_table_insert ( cache, key, pixbuf ); | |
55 | queue_size += gdk_pixbuf_get_rowstride(pixbuf) * gdk_pixbuf_get_height(pixbuf); | |
56 | queue_size += 100; | |
57 | queue_count++; | |
58 | } | |
59 | ||
60 | static void cache_remove(const gchar *key) | |
61 | { | |
62 | GdkPixbuf *buf = g_hash_table_lookup ( cache, key ); | |
63 | if (buf) { | |
64 | queue_size -= gdk_pixbuf_get_rowstride(buf) * gdk_pixbuf_get_height(buf); | |
65 | queue_size -= 100; | |
66 | queue_count --; | |
67 | g_hash_table_remove ( cache, key ); | |
68 | } | |
69 | } | |
70 | ||
50a14534 EB |
71 | /* returns key from head, adds on newtailkey to tail. */ |
72 | static gchar *list_shift_add_entry ( gchar *newtailkey ) | |
73 | { | |
74 | gchar *oldheadkey = queue_tail->next->key; | |
75 | queue_tail->next->key = newtailkey; | |
76 | queue_tail = queue_tail->next; | |
77 | return oldheadkey; | |
78 | } | |
79 | ||
80 | static gchar *list_shift () | |
81 | { | |
82 | gchar *oldheadkey = queue_tail->next->key; | |
83 | List *oldhead = queue_tail->next; | |
84 | queue_tail->next = queue_tail->next->next; | |
85 | g_free ( oldhead ); | |
86 | return oldheadkey; | |
87 | } | |
88 | ||
89 | /* adds key to tail */ | |
90 | static void list_add_entry ( gchar *key ) | |
91 | { | |
92 | List *newlist = g_malloc ( sizeof ( List ) ); | |
93 | newlist->key = key; | |
94 | if ( queue_tail ) { | |
95 | newlist->next = queue_tail->next; | |
96 | queue_tail->next = newlist; | |
97 | queue_tail = newlist; | |
98 | } else { | |
99 | newlist->next = newlist; | |
100 | queue_tail = newlist; | |
101 | } | |
102 | } | |
103 | ||
104 | void a_mapcache_add ( GdkPixbuf *pixbuf, gint x, gint y, gint z, guint8 type, guint zoom, guint8 alpha, gdouble xshrinkfactor, gdouble yshrinkfactor ) | |
105 | { | |
106 | gchar *key = g_strdup_printf ( HASHKEY_FORMAT_STRING, x, y, z, type, zoom, alpha, xshrinkfactor, yshrinkfactor ); | |
107 | static int tmp = 0; | |
108 | ||
fd4536cf | 109 | cache_add(key, pixbuf); |
50a14534 EB |
110 | |
111 | if ( queue_size > VIK_CONFIG_MAPCACHE_SIZE ) { | |
112 | gchar *oldkey = list_shift_add_entry ( key ); | |
fd4536cf | 113 | cache_remove(oldkey); |
1fe49af0 | 114 | |
725c87e1 EB |
115 | while ( queue_size > VIK_CONFIG_MAPCACHE_SIZE && |
116 | (queue_tail->next != queue_tail) ) { /* make sure there's more than one thing to delete */ | |
50a14534 | 117 | oldkey = list_shift (); |
fd4536cf | 118 | cache_remove(oldkey); |
50a14534 EB |
119 | } |
120 | ||
121 | /* chop off 'start' etc */ | |
122 | } else { | |
123 | list_add_entry ( key ); | |
124 | /* business as usual */ | |
125 | } | |
126 | ||
494eb388 | 127 | if ( (++tmp == 100 )) { g_print("DEBUG: queue count=%d %u\n", queue_count, queue_size ); tmp=0; } |
50a14534 EB |
128 | } |
129 | ||
130 | GdkPixbuf *a_mapcache_get ( gint x, gint y, gint z, guint8 type, guint zoom, guint8 alpha, gdouble xshrinkfactor, gdouble yshrinkfactor ) | |
131 | { | |
132 | static char key[48]; | |
133 | g_snprintf ( key, sizeof(key), HASHKEY_FORMAT_STRING, x, y, z, type, zoom, alpha, xshrinkfactor, yshrinkfactor ); | |
134 | return g_hash_table_lookup ( cache, key ); | |
135 | } | |
136 | ||
e044ae9e | 137 | void a_mapcache_remove_all_shrinkfactors ( gint x, gint y, gint z, guint8 type, guint zoom ) |
50a14534 EB |
138 | { |
139 | char key[40]; | |
140 | List *loop = queue_tail; | |
141 | List *tmp; | |
142 | gint len; | |
143 | ||
144 | if ( queue_tail == NULL ) | |
145 | return; | |
146 | ||
1fe49af0 | 147 | g_snprintf ( key, sizeof(key), HASHKEY_FORMAT_STRING_NOSHRINK_NOR_ALPHA, x, y, z, type, zoom ); |
50a14534 EB |
148 | len = strlen(key); |
149 | ||
150 | /* TODO: check logic here */ | |
151 | do { | |
152 | tmp = loop->next; | |
153 | if ( strncmp(tmp->key, key, len) == 0 ) | |
154 | { | |
fd4536cf | 155 | cache_remove(tmp->key); |
093c5c71 | 156 | if ( tmp == loop ) /* we deleted the last thing in the queue! */ |
50a14534 | 157 | loop = queue_tail = NULL; |
093c5c71 | 158 | else { |
50a14534 | 159 | loop->next = tmp->next; |
093c5c71 EB |
160 | if ( tmp == queue_tail ) |
161 | queue_tail = tmp->next; | |
162 | } | |
50a14534 EB |
163 | g_free ( tmp ); |
164 | tmp = NULL; | |
165 | } | |
166 | else | |
167 | loop = tmp; | |
168 | ||
169 | } while ( loop && (loop != queue_tail || tmp == NULL) ); | |
170 | ||
171 | /* loop thru list, looking for the one, compare first whatever chars */ | |
fd4536cf | 172 | cache_remove(key); |
50a14534 EB |
173 | } |
174 | ||
175 | void a_mapcache_uninit () | |
176 | { | |
177 | g_hash_table_destroy ( cache ); | |
178 | /* free list */ | |
179 | cache = NULL; | |
180 | } | |
181 | ||
182 |