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<!-- received="Tue Aug 17 10:51:44 1999 PDT" -->
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<!-- sent="Tue, 17 Aug 1999 18:52:54 +0100 (GMT)" -->
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<!-- name="Nick Lamb" -->
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<!-- email="njl98r@ecs.soton.ac.uk" -->
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<!-- subject="Re: SANE frames" -->
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<!-- id="" -->
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<!-- inreplyto="37B996EC.DA375BF1@wolfsburg.de" -->
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<title>sane-devel: Re: SANE frames</title>
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<h1>Re: SANE frames</h1>
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<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
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<i>Tue, 17 Aug 1999 18:52:54 +0100 (GMT)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#215">[ date ]</a><a href="index.html#215">[ thread ]</a><a href="subject.html#215">[ subject ]</a><a href="author.html#215">[ author ]</a>
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<li> <b>Next message:</b> <a href="0216.html">Andreas Dilger: "Re: SANE frames"</a>
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<li> <b>Previous message:</b> <a href="0214.html">Oliver Rauch: "Re: SANE frames"</a>
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</ul>
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<!-- body="start" -->
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On Tue, 17 Aug 1999, Oliver Rauch wrote:<br>
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<p>
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<i>> I think we need to specify the code flow for multiple images that are</i><br>
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<i>> acquired with one scan and a code flow for multi page scan (adf).</i><br>
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<p>
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We could accomplish this with:<br>
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An additional "last_image" boolean, together with "last_frame" from the<br>
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existing standard. The last_frame would indicate the last frame of a<br>
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given image, and last_image would be set when this was also the last<br>
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frame of all for the whole page.<br>
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<p>
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Then the following code flow eats all the images on a single page. You<br>
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can repeat this process for any following pages.<br>
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<p>
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do {<br>
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do {<br>
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<br>
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sane_start(...) the new frame<br>
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sane_get_parameters(...) for last_frame, last_image etc.<br>
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/* Read the whole FRAME */<br>
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<br>
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} while (!last_frame);<br>
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} while (!last_image);<br>
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<p>
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For a simple desktop scanner, you'll never go around the outer loop more<br>
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than once, because they only support one image for one page, AFAIK<br>
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Most modern scanners never go around the inner loop more than once<br>
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either, because they don't do multi-pass scans.<br>
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<p>
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This doesn't hurt compatability too badly I hope, and it means you can<br>
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have any combination of multiple pages, images-per-page and frames<br>
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per image.<br>
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<p>
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<i>> I hope the exisiting backends are able to handle this!</i><br>
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<p>
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Wouldn't be the first time we've had to fix a few backends, but I<br>
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doubt most scanners support ADF or multi-image scans anyway :)<br>
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<p>
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Nick.<br>
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<p>
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<p>
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<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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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0216.html">Andreas Dilger: "Re: SANE frames"</a>
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<li> <b>Previous message:</b> <a href="0214.html">Oliver Rauch: "Re: SANE frames"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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