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List: kwin
Subject: Re: Review Request: Implement color correction (per output)
From: Thomas_Lübking <thomas.luebking () web ! de>
Date: 2012-08-27 16:04:15
Message-ID: 20120827160415.12215.30901 () vidsolbach ! de
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> On Aug. 25, 2012, 2:58 p.m., Fredrik Höglund wrote:
> > kwin/libkwineffects/kwinglcolorcorrection.cpp, line 672
> > <http://git.reviewboard.kde.org/r/106141/diff/1/?file=80372#file80372line672>
> >
> > I'm pretty sure you want GL_CLAMP_TO_EDGE here.
>
> Casian Andrei wrote:
> Thanks, who knows how much time would have taken me to figure this out. (I took the code from \
> CompICC without looking on the documentation, thinking it's correct for this case).
FYI: it's a SUCH popular mistake that the nvidia driver until now (conditionally) took GL_CLAMP \
as GL_CLAMP_TO_EDGE Since the 300 drivers there's a GUI option for this (defaults to "on" ie. \
you suddenly got clamping errors (black lines) all over the place ;-)
> On Aug. 25, 2012, 2:58 p.m., Fredrik Höglund wrote:
> > kwin/libkwineffects/kwinglutils.cpp, line 322
> > <http://git.reviewboard.kde.org/r/106141/diff/1/?file=80375#file80375line322>
> >
> > You can't do this unconditionally. KWin has shaders that operate on pixels that have \
> > already been color corrected.
>
> Casian Andrei wrote:
> This is a tricky issue.
>
> I guess the applications should use the X Color Management stuff to specify which regions are \
> color corrected and if there are some that don't need any correction. If they do that, Kolor \
> Server will see it and update the regions that will end up in KWin. So for areas not to be \
> corrected by KWin, a dummy lookup table will be used for correction, sRGB -> sRGB (basically \
> does nothing).
> If the applications don't use the X Color Management and color correction is enabled in KWin \
> too, then I think it sucks.
> Perhaps my mentor could give details :/
I don't think this is what Fredrik meant - some shaders will operate on a previously buffered \
(and color corrected) output. If you inject color correction here as well, you'll "correct" \
twice.
- Thomas
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/106141/#review17979
-----------------------------------------------------------
On Aug. 23, 2012, 2:56 p.m., Casian Andrei wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/106141/
> -----------------------------------------------------------
>
> (Updated Aug. 23, 2012, 2:56 p.m.)
>
>
> Review request for kwin, Thomas Lübking and Martin Gräßlin.
>
>
> Description
> -------
>
> These are the results of my GSoC project, for KWin.
>
> This color correction needs KolorManager installed, 'kded' branch. That one needs Oyranos.
> git://anongit.kde.org/kolor-manager.git http://www.oyranos.org/downloads
> If it's not installed, the ColorCorrection class should fail without causing any issues to \
> the user (that's if it's enabled from the KCM). Probably a notification could be appropriate \
> in that case? "Failed to initialize CC because cannot contact Kolor-Server KDED..." something \
> like that?
> Change summary:
> --
> Add an option to kcmcompositing in the 'Advanced' tab, to enable or disable color correction. \
> It is specified that it's experimental and it needs Kolor Manager. This implies some small \
> changes to options.h and cpp.
> In composite.cpp, the ColorCorrection class instance is initialized or cleaned up (it's like \
> being owned by the compositor). In workspace, there's a signal connected to reset compositing \
> if the color correction setting is changed.
> Scene::finalPaintWindow code is moved into SceneOpenGL::performPaint.
> SceneOpenGL has the declarations of some methods changed to include the screen number - those \
> could be changed to pass around PaintData's probably. SceneOpenGL's newly implemented \
> finalDrawWindow splits the rendering if color correction is enabled and there are multiple \
> screens. Before painting for a particular screen, ColorCorrection::setupForOutput should be \
> called.
> There was a problem with the blending function causing artifacts with color correction \
> enabled so it is set up to src_alpha, one_minus_src alpha in that case.
> Now, inside KWinEffects:
> --
> A screen property is added for WindowPaintData.
> In kwinglutils, The fragment shaders are intercepted before being compiled and they get a \
> couple of lines of code inserted in order to do the color stuff. This happens only when color \
> correction is enabled, of course.
> And there is the big ColorCorrection class. The public and private stuff are well separated. \
> More additions to the public stuff shouldn't be necessary in the future as far as I see it. \
> Everything is there I think. The region stuff is not used at the moment, and the 2 reset \
> methods aren't used either (for now).
> The private stuff consists of the private data and the D-Bus interface. Regarding D-Bus, \
> everything is async (I think).
> The implementation basically manages a set of color lookup tables for different outputs and \
> for different window regions. These are taken via D-Bus. Each lookup table has around 700 KB. \
> I hope I am not wrong in assuming it's not that big of an issue time-wise, since they are \
> transferred only once or twice for an entire session. I hope D-Bus doesn't do any time \
> consuming business to transfer those QVector's.
> There is an issue with OpenGL ES, apparently it doesn't support 3D textures (probably it \
> needs an extension or something). Until we envision a clear solution, I have disabled the \
> color correction for OpenGL ES.
> In case of problems, it should not affect the rest of KWin in any way.
>
> Next priorities:
> --
> Implement per-window-region stuff. It should be a matter of extending KolorServer's \
> capabilities and doing some small modifications in SceneOpenGL::Window. The ColorCorrection \
> class from KWinEffects has everything prepared.
> Fix issues with transparency / some weird colors.
>
> --
> There's another thing... I don't know when I'm supposed to be able to do improvements and \
> modifications, since the GSoC project ended. Probably if I keep the new modifications well \
> separated, there should be no issues.
>
> Diffs
> -----
>
> kwin/composite.cpp c65716b
> kwin/kcmkwin/kwincompositing/main.cpp 7a89db4
> kwin/kcmkwin/kwincompositing/main.ui cff0f63
> kwin/libkwineffects/CMakeLists.txt 14a2747
> kwin/libkwineffects/kwineffects.h 2c2f7bf
> kwin/libkwineffects/kwineffects.cpp bae85e7
> kwin/libkwineffects/kwinglcolorcorrection.h PRE-CREATION
> kwin/libkwineffects/kwinglcolorcorrection.cpp PRE-CREATION
> kwin/libkwineffects/kwinglcolorcorrection_p.h PRE-CREATION
> kwin/libkwineffects/kwinglutils.h 7a7c3c9
> kwin/libkwineffects/kwinglutils.cpp 016d31e
> kwin/options.h 9e4fcc6
> kwin/options.cpp 72f168d
> kwin/scene.h 3891198
> kwin/scene.cpp 5782510
> kwin/scene_opengl.h de33ce4
> kwin/scene_opengl.cpp cbcc0ca
> kwin/workspace.cpp cf3f308
>
> Diff: http://git.reviewboard.kde.org/r/106141/diff/
>
>
> Testing
> -------
>
> Restarted KDED making sure Kolor-Manager is installed properly - this should make the KDED \
> module available.
> Restarted KWin, enabled color correction in KCM compositing, advanced tab.
>
> Played a bit with commands like:
> oyranos-monitor -d 0 XYZ.icc
> oyranos-monitor -d 1 Lab.icc
> Those set up particular profiles for the monitors. However, it seems there is a problem with \
> reverting to the normal ones. The code regarding that is taken directly from CompICC, so I \
> don't know whether it's a bug or a feature. Anyway, it's from Kolor-Server.
> Apparently, everything works as planned. But I cannot distinguish visible differences for the \
> profiles used for the different monitors by default.
> There is an issue with the transparent areas - they are darkened somehow. This should be easy \
> to fix, I have left the issue around because I hadn't time to finish before the GSoC deadline \
> and it makes it possible to quickly find out whether color correction is enabled or not :). \
> Perhaps, it's because of the blending function and not because of the correction. Also, \
> there's something wrong with the highlights in gitk, I don't know exactly what. So, small \
> issues are present.
>
> Screenshots
> -----------
>
> Output 0 Lab.icc Output 1 XYZ.icc
> http://git.reviewboard.kde.org/r/106141/s/695/
>
>
> Thanks,
>
> Casian Andrei
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/106141/">http://git.reviewboard.kde.org/r/106141/</a>
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<br />
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On August 25th, 2012, 2:58 p.m., <b>Fredrik Höglund</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<table width="100%" border="0" bgcolor="white" style="border: 1px solid #C0C0C0; \
border-collapse: collapse; margin: 2px padding: 2px;"> <thead>
<tr>
<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/106141/diff/1/?file=80372#file80372line672" \
style="color: black; font-weight: bold; text-decoration: \
underline;">kwin/libkwineffects/kwinglcolorcorrection.cpp</a> <span style="font-weight: \
normal;">
(Diff revision 1)
</span>
</th>
</tr>
</thead>
<tbody style="background-color: #e4d9cb; padding: 4px 8px; text-align: center;">
<tr>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void \
ColorCorrectionPrivate::setupCCTexture(GLuint texture, const Clut& clut)</pre></td>
</tr>
</tbody>
<tbody>
<tr>
<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">672</font></th> \
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> \
<span class="n">glTexParameteri</span><span class="p">(</span><span \
class="n">GL_TEXTURE_3D</span><span class="p">,</span> <span \
class="n">GL_TEXTURE_WRAP_S</span><span class="p">,</span> <span class="n">GL_CLAMP</span><span \
class="p">);</span></pre></td> </tr>
</tbody>
</table>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; \
white-space: -o-pre-wrap; word-wrap: break-word;">I'm pretty sure you want GL_CLAMP_TO_EDGE \
here.</pre> </blockquote>
<p>On August 27th, 2012, 2:56 p.m., <b>Casian Andrei</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; \
white-space: -o-pre-wrap; word-wrap: break-word;">Thanks, who knows how much time would have \
taken me to figure this out. (I took the code from CompICC without looking on the \
documentation, thinking it's correct for this case).</pre> </blockquote>
</blockquote>
<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;">FYI: it's a SUCH popular \
mistake that the nvidia driver until now (conditionally) took GL_CLAMP as GL_CLAMP_TO_EDGE \
Since the 300 drivers there's a GUI option for this (defaults to "on" ie. you \
suddenly got clamping errors (black lines) all over the place ;-) </pre> <br />
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On August 25th, 2012, 2:58 p.m., <b>Fredrik Höglund</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<table width="100%" border="0" bgcolor="white" style="border: 1px solid #C0C0C0; \
border-collapse: collapse; margin: 2px padding: 2px;"> <thead>
<tr>
<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/106141/diff/1/?file=80375#file80375line322" \
style="color: black; font-weight: bold; text-decoration: \
underline;">kwin/libkwineffects/kwinglutils.cpp</a> <span style="font-weight: normal;">
(Diff revision 1)
</span>
</th>
</tr>
</thead>
<tbody style="background-color: #e4d9cb; padding: 4px 8px; text-align: center;">
<tr>
<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">bool \
GLShader::loadFromFiles(const QString &vertexFile, const QString \
&fragmentFile)</pre></td>
</tr>
</tbody>
<tbody>
<tr>
<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font \
size="2">321</font></th> <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; \
line-height: 140%; margin: 0; "> <span class="k">const</span> <span \
class="kt">char</span><span class="o">*</span> <span class="n">src</span> <span \
class="o">=</span> <span class="n">ba</span><span class="p">.</span><span \
class="n">constData</span><span class="p">();</span></pre></td> <th bgcolor="#e9eaa8" \
style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font \
size="2">320</font></th> <td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; \
line-height: 140%; margin: 0; "> <span class="c1">// Inject color correction code for \
fragment shaders, if possible</span></pre></td> </tr>
</tbody>
</table>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; \
white-space: -o-pre-wrap; word-wrap: break-word;">You can't do this unconditionally. KWin \
has shaders that operate on pixels that have already been color corrected.</pre> </blockquote>
<p>On August 27th, 2012, 2:56 p.m., <b>Casian Andrei</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; \
white-space: -o-pre-wrap; word-wrap: break-word;">This is a tricky issue.
I guess the applications should use the X Color Management stuff to specify which regions are \
color corrected and if there are some that don't need any correction. If they do that, \
Kolor Server will see it and update the regions that will end up in KWin. So for areas not to \
be corrected by KWin, a dummy lookup table will be used for correction, sRGB -> sRGB \
(basically does nothing).
If the applications don't use the X Color Management and color correction is enabled in \
KWin too, then I think it sucks.
Perhaps my mentor could give details :/</pre>
</blockquote>
</blockquote>
<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;">I don't think this is what \
Fredrik meant - some shaders will operate on a previously buffered (and color corrected) \
output. If you inject color correction here as well, you'll "correct" \
twice.</pre> <br />
<p>- Thomas</p>
<br />
<p>On August 23rd, 2012, 2:56 p.m., Casian Andrei wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" style="background-image: \
url('http://git.reviewboard.kde.org/media/rb/images/review_request_box_top_bg.png'); \
background-position: left top; background-repeat: repeat-x; border: 1px black solid;"> <tr>
<td>
<div>Review request for kwin, Thomas Lübking and Martin Gräßlin.</div>
<div>By Casian Andrei.</div>
<p style="color: grey;"><i>Updated Aug. 23, 2012, 2:56 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;">These are the results \
of my GSoC project, for KWin.
This color correction needs KolorManager installed, 'kded' branch. That one needs \
Oyranos. git://anongit.kde.org/kolor-manager.git http://www.oyranos.org/downloads
If it's not installed, the ColorCorrection class should fail without causing any issues to \
the user (that's if it's enabled from the KCM). Probably a notification could be \
appropriate in that case? "Failed to initialize CC because cannot contact Kolor-Server \
KDED..." something like that?
Change summary:
--
Add an option to kcmcompositing in the 'Advanced' tab, to enable or disable color \
correction. It is specified that it's experimental and it needs Kolor Manager. This implies \
some small changes to options.h and cpp.
In composite.cpp, the ColorCorrection class instance is initialized or cleaned up (it's \
like being owned by the compositor). In workspace, there's a signal connected to reset \
compositing if the color correction setting is changed.
Scene::finalPaintWindow code is moved into SceneOpenGL::performPaint.
SceneOpenGL has the declarations of some methods changed to include the screen number - those \
could be changed to pass around PaintData's probably. SceneOpenGL's newly implemented \
finalDrawWindow splits the rendering if color correction is enabled and there are multiple \
screens. Before painting for a particular screen, ColorCorrection::setupForOutput should be \
called.
There was a problem with the blending function causing artifacts with color correction enabled \
so it is set up to src_alpha, one_minus_src alpha in that case.
Now, inside KWinEffects:
--
A screen property is added for WindowPaintData.
In kwinglutils, The fragment shaders are intercepted before being compiled and they get a \
couple of lines of code inserted in order to do the color stuff. This happens only when color \
correction is enabled, of course.
And there is the big ColorCorrection class. The public and private stuff are well separated. \
More additions to the public stuff shouldn't be necessary in the future as far as I see it. \
Everything is there I think. The region stuff is not used at the moment, and the 2 reset \
methods aren't used either (for now).
The private stuff consists of the private data and the D-Bus interface. Regarding D-Bus, \
everything is async (I think).
The implementation basically manages a set of color lookup tables for different outputs and for \
different window regions. These are taken via D-Bus. Each lookup table has around 700 KB. I \
hope I am not wrong in assuming it's not that big of an issue time-wise, since they are \
transferred only once or twice for an entire session. I hope D-Bus doesn't do any time \
consuming business to transfer those QVector's.
There is an issue with OpenGL ES, apparently it doesn't support 3D textures (probably it \
needs an extension or something). Until we envision a clear solution, I have disabled the color \
correction for OpenGL ES.
In case of problems, it should not affect the rest of KWin in any way.
Next priorities:
--
Implement per-window-region stuff. It should be a matter of extending KolorServer's \
capabilities and doing some small modifications in SceneOpenGL::Window. The ColorCorrection \
class from KWinEffects has everything prepared.
Fix issues with transparency / some weird colors.
--
There's another thing... I don't know when I'm supposed to be able to do \
improvements and modifications, since the GSoC project ended. Probably if I keep the new \
modifications well separated, there should be no issues.</pre> </td>
</tr>
</table>
<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;">Restarted KDED making \
sure Kolor-Manager is installed properly - this should make the KDED module available.
Restarted KWin, enabled color correction in KCM compositing, advanced tab.
Played a bit with commands like:
oyranos-monitor -d 0 XYZ.icc
oyranos-monitor -d 1 Lab.icc
Those set up particular profiles for the monitors. However, it seems there is a problem with \
reverting to the normal ones. The code regarding that is taken directly from CompICC, so I \
don't know whether it's a bug or a feature. Anyway, it's from Kolor-Server.
Apparently, everything works as planned. But I cannot distinguish visible differences for the \
profiles used for the different monitors by default.
There is an issue with the transparent areas - they are darkened somehow. This should be easy \
to fix, I have left the issue around because I hadn't time to finish before the GSoC \
deadline and it makes it possible to quickly find out whether color correction is enabled or \
not :). Perhaps, it's because of the blending function and not because of the correction. \
Also, there's something wrong with the highlights in gitk, I don't know exactly what. \
So, small issues are present. </pre>
</td>
</tr>
</table>
<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.cpp <span style="color: grey">(c65716b)</span></li>
<li>kwin/kcmkwin/kwincompositing/main.cpp <span style="color: grey">(7a89db4)</span></li>
<li>kwin/kcmkwin/kwincompositing/main.ui <span style="color: grey">(cff0f63)</span></li>
<li>kwin/libkwineffects/CMakeLists.txt <span style="color: grey">(14a2747)</span></li>
<li>kwin/libkwineffects/kwineffects.h <span style="color: grey">(2c2f7bf)</span></li>
<li>kwin/libkwineffects/kwineffects.cpp <span style="color: grey">(bae85e7)</span></li>
<li>kwin/libkwineffects/kwinglcolorcorrection.h <span style="color: \
grey">(PRE-CREATION)</span></li>
<li>kwin/libkwineffects/kwinglcolorcorrection.cpp <span style="color: \
grey">(PRE-CREATION)</span></li>
<li>kwin/libkwineffects/kwinglcolorcorrection_p.h <span style="color: \
grey">(PRE-CREATION)</span></li>
<li>kwin/libkwineffects/kwinglutils.h <span style="color: grey">(7a7c3c9)</span></li>
<li>kwin/libkwineffects/kwinglutils.cpp <span style="color: grey">(016d31e)</span></li>
<li>kwin/options.h <span style="color: grey">(9e4fcc6)</span></li>
<li>kwin/options.cpp <span style="color: grey">(72f168d)</span></li>
<li>kwin/scene.h <span style="color: grey">(3891198)</span></li>
<li>kwin/scene.cpp <span style="color: grey">(5782510)</span></li>
<li>kwin/scene_opengl.h <span style="color: grey">(de33ce4)</span></li>
<li>kwin/scene_opengl.cpp <span style="color: grey">(cbcc0ca)</span></li>
<li>kwin/workspace.cpp <span style="color: grey">(cf3f308)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/106141/diff/" style="margin-left: 3em;">View \
Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Screenshots </h1>
<div>
<a href="http://git.reviewboard.kde.org/r/106141/s/695/"><img \
src="http://git.reviewboard.kde.org/media/uploaded/images/2012/08/23/cc_alter_6_400x100.png" \
style="border: 1px black solid;" alt="Output 0 Lab.icc Output 1 XYZ.icc" /></a>
</div>
</td>
</tr>
</table>
</div>
</body>
</html>
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