qscale_matrix - Man Page

#include <allegro.h>

void qscale_matrix(MATRIX *m, fixed scale);

void qscale_matrix_f(MATRIX_f *m, float scale);

Optimised routine for scaling an already generated matrix: this simply  adds in the scale factor, so there is no need to build two temporary  matrices and then multiply them together.

get_scaling_matrix(3)