al_reparent_bitmap man page
al_reparent_bitmap — Allegro 5 API For a sub-bitmap, changes the parent, position and size. This is the same as destroying the bitmap and re-creating it with al_create_sub_bitmap(3) - except the bitmap pointer stays the same. This has many uses, for example an animation player could return a single bitmap which can just be re-parented to different animation frames without having to re-draw the contents. Or a sprite atlas could re-arrange its sprites without having to invalidate all existing bitmaps. 5.1.12Synopsis
#include <allegro5/allegro.h>
void al_reparent_bitmap(ALLEGRO_BITMAP *bitmap, ALLEGRO_BITMAP *parent,
int x, int y, int w, int h)
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Allegro reference manual