corner_pin_node_t::matrix3_type corner_pin_node_t::do_calc_transform_matrix_at_frame( float frame, int subsample) const
{
Imath::Box2i src_area( input_as<image_node_t>()->format());
src_area.max.x++;
src_area.max.y++;
boost::array<Imath::V2d, 4> src_pts;
src_pts[0].x = src_area.min.x;
src_pts[0].y = src_area.min.y;
src_pts[1].x = src_area.max.x;
src_pts[1].y = src_area.min.y;
src_pts[2].x = src_area.max.x;
src_pts[2].y = src_area.max.y;
src_pts[3].x = src_area.min.x;
src_pts[3].y = src_area.max.y;
boost::array<Imath::V2d, 4> dst_pts;
get_corners_at_frame( dst_pts, frame, 1.0f / subsample);
if( quad_is_convex( dst_pts))
{
boost::optional<matrix3_type> m( quadToQuadMatrix( src_pts, dst_pts));
if( m)
return m.get();
}
return matrix3_type( 0, 0, 0,
0, 0, 0,
0, 0, 0);
}
boost::optional<Imath::M33d> corner_pin_node_t::do_calc_transform_matrix_at_time( float time, int subsample) const
{
Imath::Box2i src_area( input()->domain());
boost::array<Imath::V2d, 4> src_pts;
src_pts[0].x = src_area.min.x;
src_pts[0].y = src_area.min.y;
src_pts[1].x = src_area.max.x;
src_pts[1].y = src_area.min.y;
src_pts[2].x = src_area.max.x;
src_pts[2].y = src_area.max.y;
src_pts[3].x = src_area.min.x;
src_pts[3].y = src_area.max.y;
boost::array<Imath::V2d, 4> dst_pts;
get_corners_at_time( dst_pts, time);
boost::optional<Imath::M33d> m;
if( quad_is_convex( dst_pts))
m = quadToQuadMatrix( src_pts, dst_pts);
return m;
}