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From: greid@adobe.UUCP (Glenn Reid)
Newsgroups: net.text
Subject: Re: A POSTSCRIPT question
Message-ID: <1404@adobe.UUCP>
Date: Mon, 9-Jun-86 14:43:07 EDT
Article-I.D.: adobe.1404
Posted: Mon Jun  9 14:43:07 1986
Date-Received: Fri, 13-Jun-86 02:50:37 EDT
References: <807@ihlpm.UUCP>
Reply-To: greid@adobe.UUCP (Glenn Reid)
Distribution: net
Organization: Adobe Systems, Palo Alto
Lines: 26

In article <807@ihlpm.UUCP> rdkuphal@ihlpm.UUCP (Heading) writes:
>
>If one defines a user font, say consisting of one special character, does
>that font stay in the (memory?) in POSTSCRIPT until the machine is
>turned off?, or do you have to define the font each time you send a
>POSTSCRIPT file to the printer in order to use it?

Every job sent to a PostScript printer executes inside the context of what
is known as the "server loop".  The PostScript interpreter essentially does
a "save" of the current state, then executes the user's job (reading through
EOF), then executes a "restore" to return to the ground state.  The
save/restore mechanism will cause all operators defined during a user job
and all memory used to be relinquished, and any downloaded fonts will go with
it.

In order for a program to use a downloadable font, the font must either be
part of the current user job (do not send EOF after the font, and do not
send the font as a separate job), or it must be downloaded "outside the
server loop".  This latter may be done using the "exitserver" operator in
PostScript (see the PostScript Language Reference Manual, Addison & Wesley,
p. 294-5).

Hope this helps....

Glenn Reid
Adobe Systems