[bug #55107] PDFPIC: .psbb: support extraction of MediaBox from pdf files

[Keith Marshall]

Follow-up Comment #6, bug #55107 (project groff):

Branden,

[comment #2 comment #2:]
> I have [an] historical question.
> 
> Does anyone know why `psbb` wasn't made a preprocessor in the first place? 
...
Sorry, I don't know; the choice was made, w.r.t. EPS files, before my
association with the project began.  I can imagine, however, it may be a
matter of convenience, because by having the psbb parsing code accessible as
linked in functions, the assignment to troff's internal registers is
straightforward, whereas, if the parsing is delegated to a preprocessor, not
only does that preprocessor have to implement the same parsing logic, but
troff then incurs the overhead of setting up an IPC pipeline, to capture the
preprocessor output, then fork the preprocessor, and ultimately, reinterpret
the preprocessor output to assign the requisite register values.

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