gtk2/demos/gtk-demo/four_point_transform.h

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#pragma once
#include <graphene.h>
void perspective_3d (graphene_point3d_t *p1,
graphene_point3d_t *p2,
graphene_point3d_t *p3,
graphene_point3d_t *p4,
graphene_point3d_t *q1,
graphene_point3d_t *q2,
graphene_point3d_t *q3,
graphene_point3d_t *q4,
graphene_matrix_t *m);