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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/126381/">https://git.reviewboard.kde.org/r/126381/</a>
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<p style="margin-top: 0;">On December 18th, 2015, 9:20 a.m. UTC, <b>Martin Gräßlin</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/126381/diff/4/?file=424314#file424314line154" style="color: black; font-weight: bold; text-decoration: underline;">backends/kwayland/waylandconfig.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_blockSignals</span> <span class="o">=</span> <span class="nb">false</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;">maybe a counter for block signals? Whenever it gets blocked increment by 1, and decrement on unblok. With a bool there's always the danger of two things happening at the same time srew over your internal blocking.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Also from KWin code experience I suggest to use dedicated methods blockSignals(), unblockSignals() instead of manually changing the values. And add assert to ensure that e.g. unblock is only called if it's blocked.</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 think just keeping it internal to WaylandConfig is enough to warrant that it's not going to race. This is <em style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">only</em> done in applySettings, which would mean the user is applying two configs right after each other. That's going to cause unexpected behaviour anyway, a configChanged() too much is then the least of the problems.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Even then, if signals are unblocked, the worst thing that happens is a signal triggered more than once and the client updating more often than necessary. No big deal, IMO, the added complexity of counting is not worth it, here. (If blocking were more involved, perhaps, but it's all very local here, so easy enough to keep in check.)</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I've added setters with asserts, though.</p></pre>
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<p style="margin-top: 0;">On December 18th, 2015, 9:20 a.m. UTC, <b>Martin Gräßlin</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/126381/diff/4/?file=424314#file424314line184" style="color: black; font-weight: bold; text-decoration: underline;">backends/kwayland/waylandconfig.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_outputMap</span><span class="p">[</span><span class="n">waylandoutput</span><span class="o">-></span><span class="n">id</span><span class="p">()]</span> <span class="o">=</span> <span class="n">waylandoutput</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;">just checking: you want the semantic that an existing value is edited and if it's not existing a new pair is added?</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, I want insert(). :-)</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">(Fixed.)</p></pre>
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<p style="margin-top: 0;">On December 18th, 2015, 9:20 a.m. UTC, <b>Martin Gräßlin</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/126381/diff/4/?file=424316#file424316line37" style="color: black; font-weight: bold; text-decoration: underline;">backends/kwayland/waylandoutput.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_rotationMap</span> <span class="o">=</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;">you could move it into the Ctor's init list</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'd rather leave it here, putting the whole initializer into the init list makes it harder to read, IMO.</p></pre>
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<p style="margin-top: 0;">On December 18th, 2015, 9:20 a.m. UTC, <b>Martin Gräßlin</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/126381/diff/4/?file=424316#file424316line51" style="color: black; font-weight: bold; text-decoration: underline;">backends/kwayland/waylandoutput.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">auto</span> <span class="n">it</span> <span class="o">=</span> <span class="n">m_rotationMap</span><span class="p">.</span><span class="n">constFind</span><span class="p">(</span><span class="n">transform</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="n">it</span><span class="p">.</span><span class="n">value</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;">no check for not found. That is potentially crashy</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;">As long as the rotationMap is complete (and it is), it can't crash since this function doesn't take random values as input. Checking and falling back to "Normal" won't make it any more correct.</p></pre>
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<p>- Sebastian</p>
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<p>On December 17th, 2015, 6:53 p.m. UTC, Sebastian Kügler wrote:</p>
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<div>Review request for Plasma, Solid, Daniel Vrátil, and Martin Gräßlin.</div>
<div>By Sebastian Kügler.</div>
<p style="color: grey;"><i>Updated Dec. 17, 2015, 6:53 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
libkscreen
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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;">This adds a kwayland backend to libkscreen.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This backend uses KWayland's OutputManagement protocol for enlisting and
configuring devices.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Enlisting outputs</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">KScreen's outputs are created from KWayland::Client::OutputDevice objects,
they copy the data into kscreen's Outputs, and update these objects. A list
of outputs is requested from the client Registry object.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Configuring outputs</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The backend asks the global OutputManagement interface for an OutputConfiguration
object, then sets the changes per outputdevice on this object, and asks the
compositor to apply() this configuration.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">For this to work, the compositor should support the Wayland org_kde_kwin_outputdevice
and org_kde_kwin_outputmanagement protocols, for example through
KWayland::Server classes OutputDevice, OutputManagmenent and OuputConfiguration.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">General working</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">WaylandBackend creates a global static internal config, available through
WaylandBackend::internalConfig(). WaylandConfig binds to the wl_registry
callbacks and catches org_kde_kwin_outputdevice creation and destruction.
It passes org_kde_kwin_outputdevice creation and removal on to
WB::internalConfig() to handle its internal data representation as WaylandOutput.
WaylandOutput binds to org_kde_kwin_outputdevice's callback, and gets notified
of geometry and modes, including changes. WaylandOutput administrates the
internal representation of these objects, and invokes the global notifier,
which then runs the pointers it holds through the updateK* methods in
Wayland{Screen,Output,...}.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">KScreen:{Screen,Output,Edid,Mode} objects are created from the internal
representation as requested (usually triggered by the creation of a
KScreen::Config object through KScreen::Config::current()). As with other
backends, the objects which are handed out to the lib's user are expected
to be deleted by the user, the backend only takes ownership of its internal
data representation objects.</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;">The patch contains a test server, which is used for the autotests.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The test server uses KWayland's server classes and is set up from the json config data we use for the other tests. That means that the backends runs against a real server to test everything.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I also tested the kscreen UI, which also works as expected.</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>CMakeLists.txt <span style="color: grey">(efac5ce)</span></li>
<li>autotests/CMakeLists.txt <span style="color: grey">(07b7bbc)</span></li>
<li>autotests/configs/default.json <span style="color: grey">(3ac3e19)</span></li>
<li>autotests/testconfigserializer.cpp <span style="color: grey">(1af3069)</span></li>
<li>autotests/testkwaylandbackend.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>autotests/testkwaylandconfig.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/CMakeLists.txt <span style="color: grey">(ff5d751)</span></li>
<li>backends/kwayland/CMakeLists.txt <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/README.md <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandbackend.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandbackend.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandconfig.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandconfig.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandoutput.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandoutput.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandscreen.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/kwayland/waylandscreen.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>src/backendmanager.cpp <span style="color: grey">(89ae31e)</span></li>
<li>src/config.cpp <span style="color: grey">(e8b8a8f)</span></li>
<li>src/screen.h <span style="color: grey">(4cd1e82)</span></li>
<li>tests/CMakeLists.txt <span style="color: grey">(d5e41d5)</span></li>
<li>tests/kwayland/CMakeLists.txt <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/kwayland/main.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/kwayland/waylandconfigreader.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/kwayland/waylandconfigreader.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/kwayland/waylandtestserver.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/kwayland/waylandtestserver.cpp <span style="color: grey">(PRE-CREATION)</span></li>
</ul>
<p><a href="https://git.reviewboard.kde.org/r/126381/diff/" style="margin-left: 3em;">View Diff</a></p>
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