al_unlock_bitmap - Allegro 5 API

       Unlock a previously locked bitmap or bitmap region.  If the bitmap is a video bitmap, the texture will be
       updated to match the system memory copy (unless it was locked read only).

       al_unlock_bitmap - Allegro 5 API

al_lock_bitmap(3alleg5),         al_lock_bitmap_region(3alleg5),         al_lock_bitmap_blocked(3alleg5),
       al_lock_bitmap_region_blocked(3alleg5)

Allegro reference manual                                                               al_unlock_bitmap(3alleg5)

              #include <allegro5/allegro.h>

              void al_unlock_bitmap(ALLEGRO_BITMAP *bitmap)