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#include "pch.h"
#include "Cache.h"
Cache::Cache(void)
{
this->size = 0;
this->head = NULL;
this->tail = NULL;
}
Cache::~Cache(void)
{
}
void Cache::Empty(fz_context *mu_ctx)
{
if (this != nullptr) {
cache_entry_t *curr_entry = this->head;
while (curr_entry != NULL)
{
cache_entry_t *old_entry = curr_entry;
curr_entry = old_entry->next;
fz_drop_display_list(mu_ctx, old_entry->dlist);
delete old_entry;
}
this->size = 0;
this->head = NULL;
this->tail = NULL;
}
}
void Cache::Add(int value, int width_in, int height_in, fz_display_list *dlist,
fz_context *mu_ctx)
{
std::lock_guard<std::mutex> lock(cache_lock);
/* If full, then delete the tail */
if (size >= MAX_DISPLAY_CACHE_SIZE)
{
cache_entry_t *curr_entry = this->tail;
cache_entry_t *prev_entry = curr_entry->prev;
if (prev_entry != NULL)
prev_entry->next = NULL;
else
head = NULL;
tail = prev_entry;
/* Decrement the caches rc of this list */
fz_drop_display_list(mu_ctx, curr_entry->dlist);
delete curr_entry;
size--;
}
/* Make a new entry and stick at head */
cache_entry_t *new_entry = new cache_entry_t;
new_entry->dlist = dlist;
new_entry->index = value;
new_entry->width = width_in;
new_entry->height = height_in;
new_entry->prev = NULL;
if (head == NULL)
{
new_entry->next = NULL;
head = new_entry;
tail = new_entry;
}
else
{
new_entry->next = head;
head->prev = new_entry;
head = new_entry;
}
size++;
/* We are going to use this item now */
fz_keep_display_list(mu_ctx, new_entry->dlist);
}
fz_display_list* Cache::Use(int value, int *width_out, int *height_out, fz_context *mu_ctx)
{
std::lock_guard<std::mutex> lock(cache_lock);
cache_entry_t *curr_entry = this->head;
while (curr_entry != NULL)
{
if (curr_entry->index == value)
break;
curr_entry = curr_entry->next;
}
if (curr_entry != NULL)
{
fz_keep_display_list(mu_ctx, curr_entry->dlist);
/* Move this to the front */
if (curr_entry != head)
{
cache_entry_t *prev_entry = curr_entry->prev;
cache_entry_t *next_entry = curr_entry->next;
prev_entry->next = next_entry;
if (next_entry != NULL)
next_entry->prev = prev_entry;
else
tail = prev_entry;
curr_entry->prev = NULL;
curr_entry->next = head;
head->prev = curr_entry;
head = curr_entry;
}
*width_out = curr_entry->width;
*height_out = curr_entry->height;
return curr_entry->dlist;
}
else
return NULL;
}
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