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71 wiersze
3.3 KiB
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<!-- received="Thu Jun 19 10:17:11 1997 MST" -->
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<!-- sent="Thu, 19 Jun 1997 13:09:18 -0400 (EDT)" -->
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<!-- name="Andrew Kuchling" -->
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<!-- email="amk@magnet.com" -->
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<!-- subject="Re: QuickCam bit depth wired to 8: why?" -->
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<!-- id="199706191709.NAA23353@lemur.magnet.com" -->
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<!-- inreplyto="QuickCam bit depth wired to 8: why?" -->
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<title>sane-devel: Re: QuickCam bit depth wired to 8: why?</title>
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<h1>Re: QuickCam bit depth wired to 8: why?</h1>
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<b>Andrew Kuchling</b> (<a href="mailto:amk@magnet.com"><i>amk@magnet.com</i></a>)<br>
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<i>Thu, 19 Jun 1997 13:09:18 -0400 (EDT)</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#120">[ date ]</a><a href="index.html#120">[ thread ]</a><a href="subject.html#120">[ subject ]</a><a href="author.html#120">[ author ]</a>
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<li> <b>Next message:</b> <a href="0121.html">Mathias Weigt: "Problem compiling umax-driver with glibc-2.03"</a>
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<li> <b>Previous message:</b> <a href="0119.html">David Mosberger-Tang: "Re: QuickCam bit depth wired to 8: why?"</a>
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<li> <b>Maybe in reply to:</b> <a href="0115.html">Andrew Kuchling: "QuickCam bit depth wired to 8: why?"</a>
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</ul>
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David Mosberger-Tang wrote:<br>
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<i>>qc_readbytes() would be the right place. Cases 4 and 6 there can occur</i><br>
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<i>>with the b&w camera only.</i><br>
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<p>
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However, reader_process also inverts the values for the B&W<br>
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qcam, so just shifting things over in qc_readbytes() isn't enough.<br>
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For the moment I've added the shift to reader_process() after the<br>
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inversion (patch included below FYI) and it works fine; if doing the<br>
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shift in reader_process() is unacceptable, let me know and I'll redo<br>
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the patch. (Maybe the inversion should be taken out of reader_process<br>
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and moved into the 4- and 6-bit cases in qc_readbytes?)<br>
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<p>
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<p>
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Andrew Kuchling<br>
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<a href="mailto:amk@magnet.com">amk@magnet.com</a><br>
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<a href="http://people.magnet.com/%7Eamk/">http://people.magnet.com/%7Eamk/</a><br>
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<p>
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<p>
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diff -urN /scratch/sane-0.6/backend/qcam.c sane-0.6/backend/qcam.c<br>
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--- /scratch/sane-0.6/backend/qcam.c Sat Jun 14 17:30:54 1997<br>
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+++ sane-0.6/backend/qcam.c Thu Jun 19 12:50:33 1997<br>
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@@ -858,6 +858,10 @@<br>
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but output must be 0-15 */<br>
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if (buffer[len + i] > 0 || invert != 16)<br>
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buffer[len + i] = invert - buffer[len + i];<br>
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+ if (invert==16) <br>
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+ buffer[len+i] <<= 4;<br>
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+ else <br>
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+ buffer[len+i] <<= 2;<br>
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}<br>
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}<br>
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qc_readbytes (s, 0); /* reset state machine */<br>
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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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/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="0121.html">Mathias Weigt: "Problem compiling umax-driver with glibc-2.03"</a>
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<li> <b>Previous message:</b> <a href="0119.html">David Mosberger-Tang: "Re: QuickCam bit depth wired to 8: why?"</a>
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<li> <b>Maybe in reply to:</b> <a href="0115.html">Andrew Kuchling: "QuickCam bit depth wired to 8: why?"</a>
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<!-- nextthread="start" -->
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</ul>
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