al_get_pixel_block_size - Allegro 5 API

       Return the number of bytes that a block of pixels with this format occupies.

       al_get_pixel_block_size - Allegro 5 API

ALLEGRO_PIXEL_FORMAT(3alleg5), al_get_pixel_block_width(3alleg5), al_get_pixel_block_height(3alleg5)

Allegro reference manual                                                        al_get_pixel_block_size(3alleg5)

       5.1.9.

              #include <allegro5/allegro.h>

              int al_get_pixel_block_size(int format)