Get a dictionary mapping the names of a particular type of
resource to Atoms. The Atoms returned are typically RefAtom objects
referring to an IndirectObject. However some resource types
(notably color spaces) may be referred to direct.
It is unusual to look up just one resource name. Typically one
has a sequence of resource names from a content stream which all
need resolving. For this reason it is best to use this function to
obtain a map which can then be cached.
For resources referenced from the content stream of a page you
should pass the ID of the page as this is the containing object.
For resources referenced from a Form XObject stream you should pass
the ID of the Form XObject as this is the containing object.