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On 15/03/09 11:19 PM Neil Mayhew wrote:
<blockquote cite="mid:49BDE173.1040006@users.sourceforge.net"
type="cite">
<div class="moz-text-flowed" style="font-size: 10px;" lang="x-unicode">Am
I correct in thinking that I should get identical SVG output on the
different platforms?<br>
</div>
</blockquote>
<br>
I didn't get any feedback about this question...<br>
<br>
<blockquote cite="mid:49BDE173.1040006@users.sourceforge.net"
type="cite">
<div class="moz-text-flowed" style="font-size: 10px;" lang="x-unicode">I
can send sample output and code if desired. <br>
</div>
</blockquote>
<br>
... so I'm sending some files. Attached are the SVGs from Mac and
Linux. There's just two very slight differences, which aren't easily to
spot in a regular line-oriented diff. You need to look at them in meld
(Linux) or TextWrangler's diff (Mac) to see the difference. For
example, on line 9 Mac has 0.834007 and Linux has 0.834694.<br>
<br>
I'm also sending the output of cairo-trace --no-callbacks. I couldn't
build it on Mac (you knew this, right?) , because it depends on ELF for
the callbacks. However, I built it on Linux from git, and ran it with
the system cairo libraries. Based on my own tracing, I believe the
output on Mac would be identical if it were possible.<br>
<br>
Interestingly, some of the coordinates in the SVGs don't agree with
what's in the trace. In the first stroked path, for example, the SVG
has "M 0 0.000341478" but the trace has "0 0 m" (which corresponds to
what I had in my code). However, the 87.971302 that follows almost
immediately agrees exactly. Then there's a disagreement over 75.779717
vs 75.779804, but agreement on -12.971302. It looks like there's some
sort of rounding error going on, but not in every case.<br>
<br>
I know these differences may seem very small, but they make regression
testing almost impossible.<br>
<br>
--Neil<br>
<br>
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