[cups.general] pstops and DSC conformance (again)

[Michael Sweet]

On Nov 6, 2009, at 9:02 AM, Tim Waugh wrote:

> On Fri, 2009-11-06 at 08:36 -0800, Michael Sweet wrote:
>> It is not.  Strictly speaking, setpagedevice (and any code that  
>> redefines that operator) is discouraged in DSC-conforming documents.   
>> Use of setpagedevice has to be limited to code surrounded by %%Begin/ 
>> EndFeature: comments.
> 
> OK, thanks for clarifying.  Where did you find that by the way?

Section 4.2 of the DSC spec says this:

    There are generally few restrictions on the script. It can have
    definitions like the prolog and it can also modify the graphics
    environment, draw marks on the page, issue showpage, and so on.
    There are some PostScript language operators that should be
    avoided or at least used with extreme caution. A thorough
    discussion of these operators can be found in Appendix I of the
    PostScript Language Reference Manual, Second Edition.

Following the reference to Appendix I: Guidelines for Specific Operators yields the recommendation to put setpagedevice inside %%Begin/EndFeature comments, specifically Level 1 compatibility and number-up support.

>> Some day I'm going to have cupstestdsc updated so that it can detect  
>> this sort of problem... :)
> 
> That would be great. ;-)
> 
> Tim.
> */
> 
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___________________________________________________
Michael Sweet, Senior Printing System Engineer