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<body><span class="vcard"><a class="email" href="mailto:sixtysix@inwind.it" title="Massimo <sixtysix@inwind.it>"> <span class="fn">Massimo</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - cairo-tor-scan-converter is off by half of a subrow."
href="https://bugs.freedesktop.org/show_bug.cgi?id=84396">bug 84396</a>
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<th>What</th>
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<td style="text-align:right;">Attachment #106961 is obsolete</td>
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<td>1
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - cairo-tor-scan-converter is off by half of a subrow."
href="https://bugs.freedesktop.org/show_bug.cgi?id=84396#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - cairo-tor-scan-converter is off by half of a subrow."
href="https://bugs.freedesktop.org/show_bug.cgi?id=84396">bug 84396</a>
from <span class="vcard"><a class="email" href="mailto:sixtysix@inwind.it" title="Massimo <sixtysix@inwind.it>"> <span class="fn">Massimo</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=107095" name="attach_107095" title="proof of concept">attachment 107095</a> <a href="attachment.cgi?id=107095&action=edit" title="proof of concept">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=84396&attachment=107095'>[review]</a>
proof of concept
Two other problems are that the grid cairo-tor-scan-converter uses is
asymmetric
so edges are snapped to grid vertices on different coordinates on the x/y axis.
And there is a maximum precision issue that prevents increasing GRID_{X,Y}_BITS
too much. With the attached patch #defining them to 7 (not in the patch,
at lines 118-119), coverage-rhombus passes, but tests with longer edges fail,
probably because an overflow in certain multiplication or whatever.</pre>
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