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/* imgcache.c
* Image cache
* (c) 2002 Mikulas Patocka
* This file is a part of the Links program, released under GPL.
*/
#include "cfg.h"
#ifdef G
#include "links.h"
static struct list_head image_cache = { &image_cache, &image_cache };
/* xyw_meaning either MEANING_DIMS or MEANING_AUTOSCALE. */
struct cached_image *find_cached_image(int bg, unsigned char *url, int xw, int
yw, int xyw_meaning, int scale, int aspect)
{
struct cached_image *i;
if (xw>=0&&yw>=0&&xyw_meaning==MEANING_DIMS){
/* The xw and yw is already scaled so that scale and
* aspect don't matter.
*/
foreach (i, image_cache) {
if (i->background_color == bg
&& !strcmp(i->url, url)
&& i->wanted_xw==xw
&& i->wanted_yw==yw
&& i->wanted_xyw_meaning==xyw_meaning
) goto hit;
}
}else{
foreach (i, image_cache) {
if (i->background_color == bg
&& !strcmp(i->url, url)
&& i->wanted_xw==xw
&& i->wanted_yw==yw
&& i->wanted_xyw_meaning==xyw_meaning
&& i->scale==scale
&& i->aspect==aspect) goto hit;
}
}
return NULL;
hit:
i->refcount++;
del_from_list(i);
add_to_list(image_cache, i);
return i;
}
void add_image_to_cache(struct cached_image *ci)
{
add_to_list(image_cache, ci);
}
static unsigned long image_size(struct cached_image *cimg)
{
unsigned long siz = sizeof(struct cached_image);
switch(cimg->state){
case 0:
case 1:
case 2:
case 3:
case 8:
case 9:
case 10:
case 11:
break;
case 12:
case 14:
siz+=(unsigned long)cimg->width*cimg->height*cimg->buffer_bytes_per_pixel;
if (cimg->bmp.user){
case 13:
case 15:
siz+=(unsigned long)cimg->bmp.x*cimg->bmp.y*(drv->depth&7);
}
break;
#ifdef DEBUG
default:
fprintf(stderr,"cimg->state=%d\n",cimg->state);
internal("Invalid cimg->state in image_size\n");
break;
#endif /* #ifdef DEBUG */
}
return siz;
}
static int shrink_image_cache(int u)
{
struct cached_image *i;
longlong si = 0;
int r = 0;
foreach(i, image_cache) if (!i->refcount) si += image_size(i);
while ((si >= image_cache_size || u == SH_FREE_ALL || u == SH_FREE_SOMETHING) && !list_empty(image_cache)) {
i = image_cache.prev;
while (i->refcount) {
i = i->prev;
if ((void *)i == &image_cache) goto no;
}
r |= ST_SOMETHING_FREED;
si -= image_size(i);
del_from_list(i);
img_destruct_cached_image(i);
if (u == SH_FREE_SOMETHING) break;
}
no:
return r | (list_empty(image_cache) ? ST_CACHE_EMPTY : 0);
}
unsigned long imgcache_info(int type)
{
struct cached_image *i;
unsigned long n = 0;
foreach(i, image_cache) {
switch (type) {
case CI_BYTES:
n += image_size(i);
break;
case CI_LOCKED:
if (!i->refcount) break;
/* fall through */
case CI_FILES:
n++;
break;
default:
internal("imgcache_info: query %d", type);
}
}
return n;
}
void init_imgcache(void)
{
register_cache_upcall(shrink_image_cache, "imgcache");
}
#endif
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