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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/111050/">http://git.reviewboard.kde.org/r/111050/</a>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Some comments on code.
But I agree that this is too late for 4.11 - yet it's certainly a nice improvement for <whateverthenextversionwillbeorcalled></pre>
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<a href="http://git.reviewboard.kde.org/r/111050/diff/1/?file=150664#file150664line325" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/services/kmimetype.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">coding style. everywhere!
http://techbase.kde.org/Policies/Kdelibs_Coding_Style</pre>
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<a href="http://git.reviewboard.kde.org/r/111050/diff/1/?file=150664#file150664line337" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/services/kmimetype.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">dotPos</span> <span class="o">=</span> <span class="n">fileName</span><span class="p">.</span><span class="n">indexOf</span><span class="p">(</span><span class="n">QLatin1Char</span><span class="p">(</span><span class="sc">'.'</span><span class="p">));</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">"lastIndexOf"?
edit: ok, you're trying for ".tar.gz"
if (fileName.contains('.')) {
QString suffix = fileName.section('.', -2, -1);
...
}
And unroll the loop?</pre>
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<a href="http://git.reviewboard.kde.org/r/111050/diff/1/?file=150664#file150664line341" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/services/kmimetype.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QString</span> <span class="n">potentialExtension</span> <span class="o">=</span> <span class="n">fileName</span><span class="p">.</span><span class="n">mid</span><span class="p">(</span><span class="n">dotPos</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">that's called "suffix" ;-)</pre>
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<a href="http://git.reviewboard.kde.org/r/111050/diff/1/?file=150664#file150664line344" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/services/kmimetype.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">while</span><span class="p">(</span><span class="n">loop</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">if not unrolling the loop, "while (true)" ...</pre>
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<a href="http://git.reviewboard.kde.org/r/111050/diff/1/?file=150664#file150664line362" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/services/kmimetype.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">loop</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">... and "break" here</pre>
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<p>- Thomas</p>
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<p>On June 16th, 2013, 4:42 p.m. UTC, Mark Gaiser wrote:</p>
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<div>Review request for kdelibs, David Faure and Frank Reininghaus.</div>
<div>By Mark Gaiser.</div>
<p style="color: grey;"><i>Updated June 16, 2013, 4:42 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Hi,
I've recently seen Frank Reininghaus do his best in speeding up the rendering in dolphin with regards to the app icons. And trying to prevent icon flickering between "unknown" and the actual icon.
While reading his posts on the mailing list i was beginning to wonder: "is fast mime detection actually fast"? While it was certainly faster then "slow" mime detection, it still didn't really seem fast to me. A small benchmark app hat ran fast mime detection in /usr/bin took ~40ms to complete. That's for just 2656 items.
After quite a bit of profiling i managed to to bring the duration down from ~40ms to ~3ms sometimes ~4ms. That's well over 10x faster.
Mime detection by extension (like "file.tar.bz") is done as follows:
file.tar.bz
Loop - find first dot
- "tar.gz"
if that matches a mime type then it's returned if it doesn't then it proceeds on to the next dot:
- next dot: "gz"
if that matches.. return.
Otherwise it will return the default mime type.
I am getting an inconsistency. Using the unpatched fast mime detection on a file like: "test.tar.gz" gets detected as "application-x-compressed-tar" where the patched version detects it as "application-gzip". The slow and detailed mime detection detects the same file as "application-x-compressed-tar". What should it be? application-gzip or application-x-compressed-tar?
Note: This improved detection does expect folders to end with a "/". Otherwise they will be detected as application-octet-stream (the default). But i think this is common sense to let folders end with a "/". If any apps that don't do that, they should fix it i suppose.
Best thing, it's all internal and private api change. No public function is changed.
All feedback is welcome! If possible, i would like to put this in KDE 4.11.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Tested this using just output comparison between the old version and the new implementation. It works just fine.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>kdecore/services/kmimetype.h <span style="color: grey">(bc35bcf)</span></li>
<li>kdecore/services/kmimetype.cpp <span style="color: grey">(d748523)</span></li>
<li>kdecore/services/kmimetyperepository.cpp <span style="color: grey">(f56f48e)</span></li>
<li>kdecore/services/kmimetyperepository_p.h <span style="color: grey">(e1d2389)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/111050/diff/" style="margin-left: 3em;">View Diff</a></p>
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