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List: kwin
Subject: Re: Review Request 109784: rebase measuring to nano resolution and fix initial padding
From: "Ralf Jung" <post () ralfj ! de>
Date: 2013-04-12 13:40:18
Message-ID: 20130412134018.7963.76109 () vidsolbach ! de
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kwin/composite.h
<http://git.reviewboard.kde.org/r/109784/#comment22982>
Could be worth a comment that this is milliseconds, while the other times here \
are nanoseconds.
kwin/composite.cpp
<http://git.reviewboard.kde.org/r/109784/#comment22983>
padding changes units here - the code would become much more readable by getting \
rid of this variable (it's just an alias to m_timeSinceLastVBlank), and using \
something like "uint wait_time" for the timer.
- Ralf Jung
On April 10, 2013, 10:35 p.m., Thomas Lübking wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/109784/
> -----------------------------------------------------------
>
> (Updated April 10, 2013, 10:35 p.m.)
>
>
> Review request for kwin, Martin Gräßlin and Ralf Jung.
>
>
> Description
> -------
>
> summarized
>
>
> Diffs
> -----
>
> kwin/composite.h ebaf7e7
> kwin/composite.cpp 94c7eda
> kwin/options.h f61a66f
> kwin/options.cpp 6abd3f0
> kwin/scene.h 5d49c40
> kwin/scene_opengl.h 409ec3d
> kwin/scene_opengl.cpp 3343164
> kwin/scene_xrender.h 4a93940
> kwin/scene_xrender.cpp ab90815
>
> Diff: http://git.reviewboard.kde.org/r/109784/diff/
>
>
> Testing
> -------
>
> it's math.
> fpsinterval is n*vblankTime so this moves it 1ms past the last assumed tick before \
> the wanted interval spot, so that we don't have to fear to miss it.
> Assuming we paint every 3rd frame:
>
> A 1 2 3 4 5 - B 1 2 3 4 5 - C 1 2 3 4 5 - A
> ^ here (C1)
>
>
> Thanks,
>
> Thomas Lübking
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/109784/">http://git.reviewboard.kde.org/r/109784/</a>
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<th colspan="4" bgcolor="#F0F0F0" style="border-bottom: 1px solid #C0C0C0; \
font-size: 9pt; padding: 4px 8px; text-align: left;"> <a \
href="http://git.reviewboard.kde.org/r/109784/diff/3/?file=138170#file138170line316" \
style="color: black; font-weight: bold; text-decoration: \
underline;">kwin/composite.h</a> <span style="font-weight: normal;">
(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; \
">private:</pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2"></font></th> <td bgcolor="#c5ffc4" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td> <th \
bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid \
#C0C0C0;" align="right"><font size="2">316</font></th> <td bgcolor="#c5ffc4" \
width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span \
class="kt">int</span> <span class="n">m_nextFrameDelay</span><span \
class="p">;</span></pre></td> </tr>
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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;">Could be \
worth a comment that this is milliseconds, while the other times here are \
nanoseconds.</pre> </div>
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<table width="100%" border="0" bgcolor="white" style="border: 1px solid #C0C0C0; \
border-collapse: collapse; margin: 2px padding: 2px;"> <thead>
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<th colspan="4" bgcolor="#F0F0F0" style="border-bottom: 1px solid #C0C0C0; \
font-size: 9pt; padding: 4px 8px; text-align: left;"> <a \
href="http://git.reviewboard.kde.org/r/109784/diff/3/?file=138171#file138171line625" \
style="color: black; font-weight: bold; text-decoration: \
underline;">kwin/composite.cpp</a> <span style="font-weight: normal;">
(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void \
Compositor::setCompositeTimer()</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" \
align="right"><font size="2">622</font></th> <td bgcolor="#fdfebc" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "> <span \
class="n">padding</span> <span class="o">=</span> <span class="p">(</span><span \
class="n">padding</span> <span class="o">+</span> <span \
class="n">vBlankInterval</span> <span class="o">-</span> <span \
class="n">options</span><span class="o">-></span><span \
class="n">vBlankTime</span><span class="p">())</span><span class="hl"> </span><span \
class="o"><span class="hl">>></span></span><span class="hl"> </span><span \
class="mi"><span class="hl">10</span></span><span class="p">;</span> <span \
class="c1">// so we add one</span></pre></td> <th bgcolor="#e9eaa8" \
style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" \
align="right"><font size="2">625</font></th> <td bgcolor="#fdfebc" width="50%"><pre \
style="font-size: 8pt; line-height: 140%; margin: 0; "> <span \
class="n">padding</span> <span class="o">=</span> <span class="n"><span \
class="hl">nanoToMilli</span></span><span class="p">(</span><span \
class="n">padding</span> <span class="o">+</span> <span \
class="n">vBlankInterval</span> <span class="o">-</span> <span \
class="n">options</span><span class="o">-></span><span \
class="n">vBlankTime</span><span class="p">());</span> <span class="c1">// so we add \
one</span></pre></td> </tr>
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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;">padding \
changes units here - the code would become much more readable by getting rid of this \
variable (it's just an alias to m_timeSinceLastVBlank), and using something like \
"uint wait_time" for the timer.</pre> </div>
<br />
<p>- Ralf</p>
<br />
<p>On April 10th, 2013, 10:35 p.m. CEST, Thomas Lübking wrote:</p>
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<div>Review request for kwin, Martin Gräßlin and Ralf Jung.</div>
<div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated April 10, 2013, 10:35 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<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;">summarized</pre> </td>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<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;">it's math. fpsinterval is n*vblankTime so this moves it 1ms past the \
last assumed tick before the wanted interval spot, so that we don't have to fear \
to miss it.
Assuming we paint every 3rd frame:
A 1 2 3 4 5 - B 1 2 3 4 5 - C 1 2 3 4 5 - A
^ here (C1)</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kwin/composite.h <span style="color: grey">(ebaf7e7)</span></li>
<li>kwin/composite.cpp <span style="color: grey">(94c7eda)</span></li>
<li>kwin/options.h <span style="color: grey">(f61a66f)</span></li>
<li>kwin/options.cpp <span style="color: grey">(6abd3f0)</span></li>
<li>kwin/scene.h <span style="color: grey">(5d49c40)</span></li>
<li>kwin/scene_opengl.h <span style="color: grey">(409ec3d)</span></li>
<li>kwin/scene_opengl.cpp <span style="color: grey">(3343164)</span></li>
<li>kwin/scene_xrender.h <span style="color: grey">(4a93940)</span></li>
<li>kwin/scene_xrender.cpp <span style="color: grey">(ab90815)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/109784/diff/" style="margin-left: \
3em;">View Diff</a></p>
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