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al_invert_transform(3) al_invert_transform(3)

al_invert_transform - Allegro 5 API 


#include <allegro5/allegro.h>
void al_invert_transform(ALLEGRO_TRANSFORM *trans)

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(3) to ascertain if the transformation has an inverse before inverting it if you are in doubt.

Parameters:

•
trans - Transformation to invert

Note: Allegro’s transformation inversion functions work correctly only with 2D transformations.

al_check_inverse(3)
Allegro reference manual
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