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<title>sane-devel: Re: repeat post: xcam frontend for SANE</title>
<h1>Re: repeat post: xcam frontend for SANE</h1>
<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de"><i>becka@sunserver1.rz.uni-duesseldorf.de</i></a><br>
<i>Tue, 28 Jan 1997 16:39:30 +0100 (MET)</i>
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<i>&gt; Finally, I found that the "first_frame" field in the parameter</i><br>
<i>&gt; structure to be rather useless. I'd much prefer to have a</i><br>
<i>&gt; "last_frame" field that tells you when the last frame in an image</i><br>
<i>&gt; arrived. Anybody have any objections to this? I can think of a</i><br>
<i>&gt; reason to want "first_frame" (since it will always be true for the</i><br>
<i>&gt; first frame after sane_start), but "last_frame" would be extremely</i><br>
<i>&gt; handy (e.g., xcam would decode/buffer frames until it hits the</i><br>
<i>&gt; last_frame, and then actually render the collected image).</i><br>
<p>
Maybe the "first_frame" bit gets read a bit more "in the right place", i.e.<br>
_before_ starting to read the _first_ channel of the next image instead of<br>
_before_ starting to read the _last_ channel of the next image.<br>
<p>
What I mean is if F mean the time, when the *_frame var is read :<br>
<p>
first_frame: F RR GG BB F RR GG BB F ...<br>
<i> |-+------+ |-+------+ |-+--</i><br>
<p>
last _frame: RR GG L BB RR GG L BB RR<br>
+-----|--+ +-----|--+<br>
<p>
Actually "first frame" should be interpreted as "finish processing the last<br>
frame and prepare for a new one".<br>
<p>
CU,Andy<br>
<p>
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--
==============================================================================
Andreas Beck | Email : &lt;<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a>&gt;
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