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#include "bmlist.h"
#include <memory.h>
volatile static bm_t *current, *head, *tail;
static void bm_add(bm_t *new, bm_t *prev, bm_t *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
bm_t *bmlist_insert(bm_t *at, bm_t *new)
{
bm_add(new, at, at->next);
return new;
}
bm_t *bmlist_append(bm_t *new)
{
bmlist_insert(tail, new);
tail = new;
return new;
}
bm_t *bmlist_gonext()
{
current = current->next;
current->anim_step = 0;
return current;
}
bm_t *bmlist_goprev()
{
current = current->prev;
current->anim_step = 0;
return current;
}
bm_t *bmlist_gohead()
{
current = head;
current->anim_step = 0;
return current;
}
bm_t *bmlist_current()
{
return current;
}
static void list_del(bm_t *prev, bm_t *next)
{
prev->next = next;
next->prev = prev;
}
bm_t *bmlist_drop(bm_t *bm)
{
list_del(bm->prev, bm->next);
return bm->next;
}
bm_t *bm_new(uint16_t width)
{
bm_t *bm = malloc(sizeof(bm_t));
memset(bm, 0, sizeof(bm_t));
bm->width = width;
bm->buf = malloc(width * sizeof(uint16_t));
memset(bm->buf, 0, width * sizeof(uint16_t));
bm->next = bm;
bm->prev = bm;
return bm;
}
void bmlist_init(uint16_t first_bm_width)
{
current = bm_new(first_bm_width);
head = current;
tail = current;
}
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