IPP Mail Archive: IPP> Re: [printing-cap] Capabilities API:

IPP Mail Archive: IPP> Re: [printing-cap] Capabilities API:

IPP> Re: [printing-cap] Capabilities API: Device Object [How about a M edia Object]

From: Michael Sweet (mike@easysw.com)
Date: Fri Sep 27 2002 - 08:41:37 EDT

  • Next message: Hastings, Tom N: "IPP> RE: [printing-cap] Capabilities API: Device Object [media-margin- sizes (1setOf integer)]"

    Hastings, Tom N wrote:
    > ...
    > The only problem left is what to return when the job context supplied
    > doesn't specify enough to return a single set of margins? For
    > example, if the margins depend on the media size, but the job context
    > didn't have a media size. Or as another example, suppose the margins

    But the printer object has defaults for all printing attributes,
    which are used when the job object doesn't override them...

    > depend on whether one-sided or two-sided printing is to be done, but
    > the job context doesn't supply the "sides" attribute. How about just

    Again, "sides" is defaulted.

    However, in the case of many of the current HP inkjets with the
    auto-duplexer option, the top and bottom margins are swapped for
    the back page. In CUPS we have a PPD attribute for this, but in
    general I'd suspect the sane thing to do would be to report the
    same top and bottom margin (the larger of the two for safety, and
    the app/user can still try printing outside of those margins)

    > Comment on papiPrinterQuery: I assume that when the caller omits most
    > or all of the job context, that what is returned is more like all
    > possible things supported, rather than assuming the defaults for each
    > of the job context attributes. That should be clarified (along with
    > the union versus intersection issue).

    If we use constraints, then the query operation without job attrs
    will list all possible values (+ the constraints); the addition of
    job attrs will only narrow the query results.

    Michael Sweet, Easy Software Products                  mike@easysw.com
    Printing Software for UNIX                       http://www.easysw.com

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