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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/119822/">https://git.reviewboard.kde.org/r/119822/</a>
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<p style="margin-top: 0;">On August 18th, 2014, 1:55 p.m. CEST, <b>Àlex Fiestas</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;">Besides the nitpits, here is a concern I have.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">KScreen is a library that should be used only by components of the shell (kwin, plasma, kscreen), the idea is to have a library that manipulates lowlevel stuff directly so we can control how we do things (events and what not). Because of this having a qscreen backend enabled by default (even if it is only in platforms where we don't have a backend) imho is a no-go. We can't relay on abstractions.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">That said, I do think that having a qscreen backend is an excellent fallback to test the shell in non supported platforms while we develop a proper backend, but we have to find a way of doing so qscreen backend is not used by accident.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">To archieve this I see 2 options:<br style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;" />
1-Load qscreen backend only via KSCREEN_BACKEND env<br style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;" />
2-Improve backendloader and backends to make sure we use the proper backend in every case.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I think I will go for 1 at the moment, and we can figure out how to do the backend loading later on.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">What do you think?</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;">1 sounds like a sane approach to me especially if it's supposed to be for early testing.</p></pre>
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<p>- Martin</p>
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<p>On August 18th, 2014, 11:31 a.m. CEST, Sebastian Kügler wrote:</p>
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<div>Review request for Plasma and Solid.</div>
<div>By Sebastian Kügler.</div>
<p style="color: grey;"><i>Updated Aug. 18, 2014, 11:31 a.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 patch adds a QScreen backend to libkscreen.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This is useful to avoid a dependency on XRandR (at build time) and a running X server at runtime.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The backend itself is read-only and kept simple. It only reports the basic necessities (which is what QScreen provides).</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The changes are kept to the backends/qscreen directory, so no API has been touched. The changes outside of that directory are autotests, tests, and a fallback to the qscreen backend non non-X11 platforms. The latter will automatically make libkscreen work on Wayland (as far as QScreen allows us to, so r-o). This case otherwise just crashes, and the XRandR backend can't work. If the user specifies the backend using the KSCREEN_BACKEND env var, it will be respected, the automatism only triggers when no backend is explicitely specified. I've also added apidocs in some files, but again, no functional changes.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The plan is to augment this also with a native Wayland backend, which will take a bit longer to complete (more complex, it's r-w, I have to learn Wayland APIs). That backend is work-in-progress in the sebas/wayland branch. The QScreen backend allows us to test and run our code under Wayland, without crashing, so we can continue the port while a native Wayland backend is conceived.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">You can find the code for this QScreen backend in sebas/qscreen if you'd like to give it a try.</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;"><ul style="padding: 0;text-rendering: inherit;margin: 0 0 0 1em;line-height: inherit;white-space: normal;">
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Ran autotest "testqscreenbackend" under X11 and Wayland -- all pass</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Tested hotplugging (using included testpnp app) under X11</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Started plasmashell with KSCREEN_BACKEND=QScreen under X11</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Started kcmshell5 kcm_kscreen</li>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">All of these work correctly in my tests, no strange behaviour observed.</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>autotests/CMakeLists.txt <span style="color: grey">(18b93c0)</span></li>
<li>autotests/testqscreenbackend.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/CMakeLists.txt <span style="color: grey">(a827ee8)</span></li>
<li>backends/abstractbackend.h <span style="color: grey">(7ffe627)</span></li>
<li>backends/qscreen/CMakeLists.txt <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenbackend.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenbackend.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenconfig.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenconfig.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenoutput.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenoutput.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenscreen.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>backends/qscreen/qscreenscreen.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>src/CMakeLists.txt <span style="color: grey">(4606862)</span></li>
<li>src/backendloader.cpp <span style="color: grey">(d6ccdff)</span></li>
<li>src/config.h <span style="color: grey">(10a8f1e)</span></li>
<li>tests/CMakeLists.txt <span style="color: grey">(86efedc)</span></li>
<li>tests/testplugandplay.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/testpnp.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/testpnp.cpp <span style="color: grey">(PRE-CREATION)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/119822/diff/" style="margin-left: 3em;">View Diff</a></p>
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