/* 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"struct list_head image_cache = { &image_cache, &image_cache };/* prototypes */int image_size(struct cached_image *);int shrink_image_cache(int);/* 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);}int image_size(struct cached_image *cimg){	int siz = 100;	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+=cimg->width*cimg->height*cimg->buffer_bytes_per_pixel;		if (cimg->bmp.user){			case 13:			case 15:				siz+=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;}int shrink_image_cache(int u){	struct cached_image *i;	int si = 0;	int r = 0;	foreach(i, image_cache) if (!i->refcount) si += image_size(i);	if (u == SH_FREE_SOMETHING) si = image_cache_size + si * 1 / 4;	while ((si >= image_cache_size || u == SH_FREE_ALL) && !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);	}	no:	return r | (list_empty(image_cache) ? ST_CACHE_EMPTY : 0);}int imgcache_info(int type){	struct cached_image *i;	int 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");}/*del_from_list ...void img_destruct_cached_image(sturct cached_image *img);*/#endif