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78 wiersze
3.9 KiB
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<!-- received="Tue Mar 31 07:54:40 1998 PST" -->
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<!-- sent="Tue, 31 Mar 1998 10:54:47 -0500 (EST)" -->
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<!-- name="Chris Pinkham" -->
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<!-- email="cpinkham@billing.infi.net" -->
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<!-- subject="Re: Artec AT3 and A6000C Plus driver" -->
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<!-- id="9803311554.AA19425@mulder.looney.infi.net" -->
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<!-- inreplyto="199803310606.IAA00647@cave.BitWizard.nl" -->
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<title>sane-devel: Re: Artec AT3 and A6000C Plus driver</title>
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<h1>Re: Artec AT3 and A6000C Plus driver</h1>
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<b>Chris Pinkham</b> (<a href="mailto:cpinkham@billing.infi.net"><i>cpinkham@billing.infi.net</i></a>)<br>
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<i>Tue, 31 Mar 1998 10:54:47 -0500 (EST)</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#218">[ date ]</a><a href="index.html#218">[ thread ]</a><a href="subject.html#218">[ subject ]</a><a href="author.html#218">[ author ]</a>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0219.html">Gordon Matzigkeit: "Patch to 0.71 spec file"</a>
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<li> <b>Previous message:</b> <a href="0217.html">Hugo van der Kooij: "Re: xscanimage SIGSEGV in gtk_real_window_move_resize"</a>
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<li> <b>In reply to:</b> <a href="0213.html">Rogier Wolff: "Re: Artec AT3 and A6000C Plus driver"</a>
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</ul>
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<!-- body="start" -->
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Rogier Wolff wrote:<br>
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<i>> Chris Pinkham wrote:</i><br>
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<i>> > week or so. I have the driver working for greyscale and am finishing up</i><br>
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<i>> > correcting a RGB-mode line-offset problem similar to the Microtek. </i><br>
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<br>
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<i>> Would it be a good idea to make a sort of "library" that can solve the</i><br>
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<i>> line-offset problems, given a few parameters passed by the backend?</i><br>
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<p>
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I was going to break the code to correct this out into it's own function<br>
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anyway, maybe this could be done later. I haven't looked at the Microtek<br>
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code that closely, but I see that it also has code to convert a line of<br>
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the form 'RRRRGGGGBBBB' into 'RGBRGBRGBRGB', so it might be good to move<br>
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that out into this 'library' also sometime. From the docs that I have<br>
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for the Ultima/Artec, it looks like it always needs this conversion done<br>
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in RGB mode.<br>
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<p>
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Since I haven't looked at the Microtek code too closely, I am not sure<br>
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how similar the line-offset problem is to the Ultima/Artec. Here is a<br>
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quick description of the way my scanner works.<br>
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<p>
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There is a different line offset for each resolution supported. This<br>
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offset is obtained by: offset = 8 * ( vertical_resolution / 300 ).<br>
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For 300 dpi, the offset is 8, so R0 goes with G8 and B16, R1 ~ G9 ~ B17,<br>
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etc. I work around this by getting a buffer to hold the first<br>
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(offset * 2) lines of Red, and another to hold the first (offset) lines<br>
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of Green. The actual scan window has to be set to the desired size +<br>
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(offset * 2) because we throw away (offset) lines at the beginning<br>
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and end of the scan. I'm going to make a function where I pass it a<br>
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block of data and it fills in a buffer and size variable if there is<br>
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enough data to fill a row yet. I can then do the RRGGBB => RGBRGB fixup<br>
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either inside or after this function.<br>
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<p>
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Chris<br>
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<p>
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\<br>
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<i>| Chris Pinkham |</i><br>
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<i>| <a href="mailto:cpinkham@sh001.infi.net">cpinkham@sh001.infi.net</a> |</i><br>
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\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/<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="0219.html">Gordon Matzigkeit: "Patch to 0.71 spec file"</a>
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<li> <b>Previous message:</b> <a href="0217.html">Hugo van der Kooij: "Re: xscanimage SIGSEGV in gtk_real_window_move_resize"</a>
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<li> <b>In reply to:</b> <a href="0213.html">Rogier Wolff: "Re: Artec AT3 and A6000C Plus driver"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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