sprite_stack.c

#include "sprite_stack.h"

void stack_remove(sprite_node *node)
{
    node->previous->next = node->next;

    SDL_FreeSurface(node->sprite->image);
    free(node);
}

void stack_unshift(sprite_node *node)
{
    first->previous = node;
    node->last = first;
    first = node;
}

void stack_append(sprite_node *node)
{
    last->next = node;
    node->previous = last;
    last = node;
}

sprite_stack.h

#ifndef H_STACK_COLLECTION
#define H_STACK_COLLECTION

#include "graphics.h"

typedef struct {
    sprite *sprite;

    sprite_node *previous;
    sprite_node *next;
} sprite_node;

sprite_node *first;
sprite_node *last;

void stack_remove(sprite_node *node);
void stack_unshift(sprite_node *node);
void stack_append(sprite_node *node);
#endif