code: func (v *Context) GetMatrix() *Matrix {
  	var matrix C.cairo_matrix_t
  	C.cairo_get_matrix(v.native(), &matrix)
  	return &Matrix{
  		Xx: float64(matrix.xx),
  		Yx: float64(matrix.yx),
  		Xy: float64(matrix.xy),
  		Yy: float64(matrix.yy),
  		X0: float64(matrix.x0),
  		Y0: float64(matrix.y0),
  	}
  }
docs: // GetMatrix is a wrapper around cairo_get_matrix.