[Gs-code-review] Re: [ ghostscript-Bugs-516379 ] .setsafe disables ViewerPreProcess

[L. Peter Deutsch]

> Let me ask an obvious question:  The setpagedevice operator is not
> supposed to be cumulative.  Is the .putdeviceparams operator different?
> Why is the ViewerPreProcess value being changed?

setpagedevice *is* cumulative according to the specification.  But because
of interactions between parameters, the PostScript code in gs_setpd.ps
always presents the *entire* set of parameters to .putdeviceparams -- i.e.,
it reads the current parameters, modifies the ones in the setpagedevice
dictionary, and then sets all of them at once.

-- 

L. Peter Deutsch     |    Aladdin Enterprises   |  203 Santa Margarita Ave.
ghost at aladdin.com    |  http://www.aladdin.com  |  Menlo Park, CA 94025

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