sane_get_parameters before sane_start

From: Frederik Ramm (frederik@remote.org)
Date: Mon Mar 05 2001 - 13:11:28 PST

  • Next message: Oliver Rauch: "Re: sane_get_parameters before sane_start"

    Hi,

       in the SANE spec it says:

    > While setting up the device, it is also admissible to call
    > sane_get_parameters() to get an estimate of what the image
    > parameters will look like once image acquisition begins.
     
    Does that mean in the backend I have to calculate the scan width in
    pixels, the bytes per line value, etc. every time the user changes an
    option? Until now, I was planning to do these calculations only once,
    in sane_start, but that would mean that you'll get meaningless results
    from sane_get_parameters() unless sane_start has already been called.

    Comments from the front-end writers?

    Bye
    Frederik 

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Frederik Ramm  ##  eMail frederik@remote.org  ##  N57°48.10' W005°40.32'

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