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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/123239/">https://git.reviewboard.kde.org/r/123239/</a>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">what's needed to fix the poles? special-case it and don't optimize around there as a dirty hack maybe?</p></pre>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I need to check. Can't be rocket science though. :)</p></pre>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/123239/diff/1/?file=359917#file359917line378" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/marble/ViewportParams.cpp</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">bool ViewportParams::resolves ( const GeoDataCoordinates &coord1,</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="p">(</span> <span class="n">fabs</span><span class="p">(</span> <span class="n">lon2</span> <span class="o">-</span> <span class="n">lon1</span> <span class="p">)</span> <span class="o">+</span> <span class="n">fabs</span><span class="p">(</span> <span class="n">lat2</span> <span class="o">-</span> <span class="n">lat1</span> <span class="p">)</span> <span class="o"><span class="hl"><</span></span> <span class="n">angularResolution</span><span class="p">()</span> <span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="p">(</span> <span class="n">fabs</span><span class="p">(</span> <span class="n">lon2</span> <span class="o">-</span> <span class="n">lon1</span> <span class="p">)</span> <span class="o">+</span> <span class="n">fabs</span><span class="p">(</span> <span class="n">lat2</span> <span class="o">-</span> <span class="n">lat1</span> <span class="p">)</span> <span class="o"><span class="hl">></span></span> <span class="n">angularResolution</span><span class="p">()</span> <span class="p">);</span></pre></td>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">did you catch all usage of this function? It's a public method, I wonder if that subtly introduces bugs in 3rd party stuff if we don't rename it at the same time.</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Yes it's used only in one place. The semantic is backwards.</p></pre>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/123239/diff/1/?file=359920#file359920line136" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/marble/geodata/data/GeoDataLineString.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">m_previousResolution</span> <span class="o">=</span> <span class="n">resolution</span><span class="p">;</span></pre></td>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This is like a cache with 1 entry? Does using a QCache make sense?</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">no it's just storing a single previous value for comparison.</p></pre>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/123239/diff/1/?file=359920#file359920line138" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/marble/geodata/data/GeoDataLineString.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">resolution</span> <span class="o"><</span> <span class="mf">0.0000005</span><span class="p">)</span> <span class="n">m_level</span> <span class="o">=</span> <span class="mi">17</span><span class="p">;</span></pre></td>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">What's the reason not to use a function here? Is it supposed to be faster, more readable, or to allow fine-tuning of values?</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">What about using a QMap<int,double> instead and calling lowerBound() to return the level? That is as readable and fine-tunable and faster wrt. computational complexity (for large input sizes at least which arguably is not the case here)</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The reason not to use a function here is that this makes it easier to tweak and fine-tune single values based on trial and error testing on the screen. Using a function this would become harder to understand and would be less transparent.
Yes, using QMap could be a possible alternative - and in this case it would certainly be a bit slower for most cases - no idea whether it would be more readable.</p></pre>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/123239/diff/1/?file=359920#file359920line161" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/marble/geodata/data/GeoDataLineString.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="mi">0</span><span class="o">:</span></pre></td>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Let's have a QVector<double> m_resolution member and place the values there, then replace the implementation with sth like</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;"><div class="codehilite" style="background: #f8f8f8"><pre style="line-height: 125%">return m_resolution.value(level, m_resolution[17]);
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">That's indeed a better solution - I will change it accordingly.</p></pre>
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<p style="margin-top: 0;">On Juli 19th, 2015, 6:01 vorm. UTC, <b>Dennis Nienhüser</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/123239/diff/1/?file=359922#file359922line51" style="color: black; font-weight: bold; text-decoration: underline;">src/lib/marble/projections/AbstractProjection.cpp</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AbstractProjection::~AbstractProjection()</pre></td>
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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">AbstractProjectionPrivate</span><span class="o">::</span><span class="n">levelForResolution</span><span class="p">(</span><span class="n">qreal</span> <span class="n">resolution</span><span class="p">)</span> <span class="k">const</span> <span class="p">{</span></pre></td>
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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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">why not share with geodatalinestringprivate somehow?</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I thought about it. But I'd like to keep this stuff still in private classes. Also putting it into GeoDataLineString would require to make this method static. So the current solution seems to be more appropriate.</p></pre>
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<p>- Torsten</p>
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<p>On April 3rd, 2015, 1:34 nachm. UTC, Torsten Rahn wrote:</p>
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<div>Review request for Marble, Bernhard Beschow, Dennis Nienhüser, Marius Stanciu, and Thibaut Gridel.</div>
<div>By Torsten Rahn.</div>
<p style="color: grey;"><i>Updated April 3, 2015, 1:34 nachm.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
marble
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<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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Allow for automatically assigning detail values to the nodes inside a linestring.
This mechanism is used for PN2 parsing in this patch.
Taking the detail level into account this approach improves geometry layer performance by 20% on my i7 based machine.
This patch also fixes the "backwards" semantical meaning of ViewportParams::resolve()
In the next step this optimization could also be applied during KML and OSM parsing.</p></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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Tested manually using the Atlas map, Plain map and Political map without apparent regressions. "make test" runs fine.
Checked the geometry layer values by starting Marble with --runtimeTrace. On average the msec values are about 20% lower on my machine (and I hope that improvement is even better on slower CPUs).
Ideas for unit tests regarding this patch are welcome. ;-)</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>src/lib/marble/ViewportParams.cpp <span style="color: grey">(bca8ea9)</span></li>
<li>src/lib/marble/geodata/data/GeoDataCoordinates.h <span style="color: grey">(610b423)</span></li>
<li>src/lib/marble/geodata/data/GeoDataLineString.h <span style="color: grey">(4e4e3da)</span></li>
<li>src/lib/marble/geodata/data/GeoDataLineString.cpp <span style="color: grey">(8864518)</span></li>
<li>src/lib/marble/geodata/data/GeoDataLineString_p.h <span style="color: grey">(2c7b9ec)</span></li>
<li>src/lib/marble/projections/AbstractProjection.cpp <span style="color: grey">(591adc0)</span></li>
<li>src/lib/marble/projections/AbstractProjection_p.h <span style="color: grey">(7bbfcb5)</span></li>
<li>src/lib/marble/projections/AzimuthalProjection.cpp <span style="color: grey">(d6e7376)</span></li>
<li>src/lib/marble/projections/CylindricalProjection.cpp <span style="color: grey">(42345ab)</span></li>
<li>src/plugins/runner/pn2/Pn2Runner.cpp <span style="color: grey">(fd363c8)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/123239/diff/" style="margin-left: 3em;">View Diff</a></p>
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