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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_ref = { &image_cache_ref, &image_cache_ref };
static struct list_head image_cache_deref = { &image_cache_deref, &image_cache_deref };
#define CACHED_IMAGE_HASH_SIZE 1024
static struct cached_image *image_hash[CACHED_IMAGE_HASH_SIZE];
static unsigned hash_image(int bg, unsigned char *url, int xw, int yw, int xyw_meaning)
{
unsigned hash = hash_string(url);
hash = hash * 0x55 + bg;
hash = hash * 0x55 + xw;
hash = hash * 0x55 + yw;
hash = hash * 0x55 + xyw_meaning;
return hash % CACHED_IMAGE_HASH_SIZE;
}
/* 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, unsigned aspect)
{
struct cached_image *i;
unsigned hash = hash_image(bg, url, xw, yw, xyw_meaning);
if (xw >= 0 && yw >= 0 && xyw_meaning == MEANING_DIMS) {
/* The xw and yw is already scaled so that scale and
* aspect don't matter.
*/
for (i = image_hash[hash]; i; i = i->hash_fwdlink) {
if (i->background_color == bg
&& !strcmp(cast_const_char i->url, cast_const_char url)
&& i->wanted_xw == xw
&& i->wanted_yw == yw
&& i->wanted_xyw_meaning == xyw_meaning
) goto hit;
}
} else {
for (i = image_hash[hash]; i; i = i->hash_fwdlink) {
if (i->background_color == bg
&& !strcmp(cast_const_char i->url, cast_const_char 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->cimg_refcount++;
del_from_list(i);
add_to_list(image_cache_ref, i);
return i;
}
void add_image_to_cache(struct cached_image *ci)
{
unsigned hash = hash_image(ci->background_color, ci->url, (int)ci->wanted_xw, (int)ci->wanted_yw, ci->wanted_xyw_meaning);
ci->hash_fwdlink = image_hash[hash];
if (ci->hash_fwdlink)
ci->hash_fwdlink->hash_backlink = &ci->hash_fwdlink;
ci->hash_backlink = &image_hash[hash];
image_hash[hash] = ci;
ci->cimg_refcount = 1;
add_to_list(image_cache_ref, ci);
}
void deref_cached_image(struct cached_image *ci)
{
if (ci->cimg_refcount <= 0)
internal_error("deref_cached_image: refcount underflow: %d", ci->cimg_refcount);
ci->cimg_refcount--;
if (!ci->cimg_refcount) {
del_from_list(ci);
add_to_list(image_cache_deref, 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_used){
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_error("Invalid cimg->state in image_size\n");
break;
#endif /* #ifdef DEBUG */
}
return siz;
}
static int shrink_image_cache(int u)
{
struct cached_image *i;
struct list_head *li;
longlong si = 0;
int r = 0;
foreach(struct cached_image, i, li, image_cache_deref) si += image_size(i);
foreachback(struct cached_image, i, li, image_cache_deref) {
if (si <= image_cache_size && u == SH_CHECK_QUOTA)
break;
li = li->next;
r = ST_SOMETHING_FREED;
si -= image_size(i);
del_from_list(i);
if (i->hash_fwdlink)
i->hash_fwdlink->hash_backlink = i->hash_backlink;
*i->hash_backlink = i->hash_fwdlink;
img_destruct_cached_image(i);
if (u == SH_FREE_SOMETHING) break;
}
return r | (list_empty(image_cache_deref) && list_empty(image_cache_ref) ? ST_CACHE_EMPTY : 0);
}
my_uintptr_t imgcache_info(int type)
{
struct cached_image *i;
struct list_head *li;
my_uintptr_t n = 0;
foreach(struct cached_image, i, li, image_cache_ref) {
switch (type) {
case CI_BYTES:
n += image_size(i);
break;
case CI_LOCKED:
case CI_FILES:
n++;
break;
default:
internal_error("imgcache_info: query %d", type);
}
}
foreach(struct cached_image, i, li, image_cache_deref) {
switch (type) {
case CI_BYTES:
n += image_size(i);
break;
case CI_LOCKED:
break;
case CI_FILES:
n++;
break;
default:
internal_error("imgcache_info: query %d", type);
}
}
return n;
}
void init_imgcache(void)
{
unsigned i;
register_cache_upcall(shrink_image_cache, MF_GPI, cast_uchar "imgcache");
for (i = 0; i < CACHED_IMAGE_HASH_SIZE; i++)
image_hash[i] = NULL;
}
#endif
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