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<p>Hi Andrzej,</p>
<p><br>
</p>
<p>I did not find a simple way to predict the bit stream length</p>
<p>without repeating lots of code lines.<br>
</p>
<p>On the other hand, I also did not see an effect on the run time,</p>
<p>so the simple iteration looked good enough to me.</p>
<p>If you find different results, I'll try again.</p>
<p><br>
</p>
<p>In the meantime I was working on other improvements</p>
<p>in the existing filters, found some more special cases which</p>
<p>can be improved, but the effect will probably be smaller.<br>
</p>
<p><br>
</p>
<p>Gerd<br>
</p>
<br>
<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl><br>
<b>Gesendet:</b> Dienstag, 19. Juli 2016 13:09:15<br>
<b>An:</b> mkgmap-dev@lists.mkgmap.org.uk<br>
<b>Betreff:</b> Re: [mkgmap-dev] [Patch v1] improve LinePreparer to reduce img size</font>
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<div class="PlainText">Hi Gerd,<br>
<br>
this is great improvement, thanks! I have tested your patch on a road <br>
map and get about 4% decrease of map size. I'm compiling topo map now, I <br>
think it is over 10% size reduction.<br>
<br>
I would like to suggest some optimizing of code. I think, you can get <br>
optimum bit length directly in procedure calcDeltas from LinePreparer. <br>
Just instead of only looking for min/max bit length, create full <br>
profile: number of legs vs bit length, so you can estimate full bit size <br>
like you have done it in your previous posts, without actually <br>
processing a line. I hope this makes sens, I don't know your code so well.<br>
<br>
-- <br>
Best regards,<br>
Andrzej<br>
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