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.TH "al_invert_transform" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_invert_transform - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro.h>

void al_invert_transform(ALLEGRO_TRANSFORM *trans)
\f[R]
.fi
.SH DESCRIPTION
.PP
Inverts the passed transformation.
If the transformation is nearly singular (close to not having an
inverse) then the returned transformation may be invalid.
Use al_check_inverse(3alleg5) to ascertain if the transformation has an
inverse before inverting it if you are in doubt.
.PP
\f[I]Parameters:\f[R]
.IP \[bu] 2
trans - Transformation to invert
.RS
.PP
\f[I]Note\f[R]: Allegro\[cq]s transformation inversion functions work
correctly only with 2D transformations.
.RE
.SH SEE ALSO
.PP
al_check_inverse(3alleg5)