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<TITLE>sane-devel: Re: Writing Fujitsu M3091 backend</TITLE>
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<H1>Re: Writing Fujitsu M3091 backend</H1>
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<!-- received="Tue Feb 27 22:57:40 2001" -->
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<STRONG>From:</STRONG> mh (<A HREF="mailto:crapsite@gmx.net?Subject=Re:%20Writing%20Fujitsu%20M3091%20backend&In-Reply-To=<01022808033400.00622@slowcrap>"><EM>crapsite@gmx.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Feb 27 2001 - 22:25:54 PST
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<P>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0247.html">Tom Martone: "Re: Writing Fujitsu M3091 backend"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0251.html">Nick Lamb: "Re: Writing Fujitsu M3091 backend"</A>
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<P>
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Tom Martone, Mit, 28 Feb 2001 :
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<BR>
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[...]
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<BR>
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<EM>> As far as sending multiple pages to the front end(s), the current SANE
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</EM><BR>
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<EM>> standard supports this very well. I think that you should stay away
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</EM><BR>
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<EM>> >from your duplex=hack approach and stay with two separate pages. A
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</EM><BR>
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<EM>> single sheet scanned in duplex will look like two sheets scanned
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</EM><BR>
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<EM>> single sided with an ADF.
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</EM><BR>
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<P>The current SANE Standard says absolutely nothing about sending multiple
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<BR>
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pages to the frontends(IMHO). It's quite clear, that a frontend can call
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<BR>
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sane_start() more than once, but in fact, the SANE Standard leaves this
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<BR>
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decision to the frontend.
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<BR>
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"... If the frontend expects additional frames...,it can call sane_start())
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<BR>
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again."
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<BR>
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<P>There's no way for a backend to tell the frontend, that it actually wants
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<BR>
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to send additional images. This, however, could easily be solved with a
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<BR>
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simple flag in SANE_Parameters.
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<BR>
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<P><EM>> As far as front-ends go, xsane supports ADF mode and can deal with
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</EM><BR>
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<EM>> multiple pages in a single scan operation. For a command line, I took
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</EM><BR>
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<EM>> scanimage and reworked it into scanadf, which will also work with ADF
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</EM><BR>
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<EM>> and duplex scanners. The backend needs to reliably and correctly
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</EM><BR>
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<EM>> return the SANE_STATUS_NO_DOCS status code when the scanner is out
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</EM><BR>
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<EM>> of paper in the hopper. Look at the read loop in xsane and scanadf
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</EM><BR>
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<EM>> for the call sequence.
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</EM><BR>
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<P>In fact, scanning with an ADF doesn't mean that you can scan multiple
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<BR>
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pages in a single scan operation; it just means that the frontend can
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<BR>
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automatically proceed with the next scan operation(without user interaction).
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<BR>
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<P>IMHO, it would be better (and easier), to make a small change in the
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<BR>
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SANE Standard instead of trying to "hack around" the obviously existing
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<BR>
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insufficiencies in the current implementation.
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<BR>
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<P>Michael
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Writing%20Fujitsu%20M3091%20backend&In-Reply-To=<01022808033400.00622@slowcrap>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0249.html">Christoph Knauer: "xsane 0.72 win crashes"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0247.html">Tom Martone: "Re: Writing Fujitsu M3091 backend"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0247.html">Tom Martone: "Re: Writing Fujitsu M3091 backend"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0251.html">Nick Lamb: "Re: Writing Fujitsu M3091 backend"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0251.html">Nick Lamb: "Re: Writing Fujitsu M3091 backend"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Tue Feb 27 2001 - 23:00:23 PST</EM>
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