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al_compose_transform(3)                                al_compose_transform(3)

NAME
       al_compose_transform - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              void al_compose_transform(ALLEGRO_TRANSFORM *trans, const ALLEGRO_TRANSFORM *other)

DESCRIPTION
       Compose (combine) two transformations by a matrix multiplication.

              trans := trans other

       Note that the order of matrix multiplications is important.  The effect
       of applying the combined transform will be as if first applying trans
       and then applying other and not the other way around.

       Parameters:

       o trans - Transformation to alter

       o other - Transformation used to transform trans

Allegro reference manual                               al_compose_transform(3)