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List: kde-panel-devel
Subject: Re: Review Request 108585: Fix screenlocker lockwindow geometry on screen resizes
From: "Oliver Henshaw" <oliver.henshaw () gmail ! com>
Date: 2013-01-28 14:57:33
Message-ID: 20130128145733.13740.31102 () vidsolbach ! de
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> On Jan. 26, 2013, 2:03 p.m., Oliver Henshaw wrote:
> > I don't have multiple monitors to test with, but can you test with the the \
> > LockWindow set to some colour other than black? Just so that any bizarre side \
> > effects are more obvious.
>
> Thomas Lübking wrote:
> What "bizarre side effects" would you expect?
> My screens are ok ;-P
>
> (I could see the clock from the WM on where the exposed area would have been and \
> that area was now black)
> I'll try by a nice dodgerblue nevertheless.
>
> Oliver Henshaw wrote:
> I wanted to be completely sure that it is the lockwindow that is covering the \
> screen and not some other component. Perhaps that's overly paranoid, but I suppose \
> we should err towards the paranoid.
> Thomas Lübking wrote:
> Turns nicely blue, i also debugged me the geometry and that the slot is caught \
> (twice for the screecount change AND the resize)
> Btw and while at it - the code is partially a bit "weird":
>
> QPalette p = palette();
> p.setColor(backgroundRole(), Qt::transparent); // this is what you got to turn \
> blue
> ** Q: wtf is the background color "transparent" - this is black for 24bit, but \
> guess what it is on a 32 drawable (hint: it's not pink)
> --> Reason?
> setPalette(p); // good
> setAttribute(Qt::WA_PaintOnScreen, true); // bypasses doublebuffer, saves RAM - \
> good setAttribute(Qt::WA_NoSystemBackground, false); // iirc default, but good
> setAttribute(Qt::WA_PaintOutsidePaintEvent, true); // for bitBlt in resume()
> ** Q: what ::resume() and what bitBlt? - bitBlt is afair not evel legally supported \
> since Qt 4 and "grep -r resume *" in the screenlocker path is this lone and a label \
> content.
> void LockWindow::paintEvent(QPaintEvent* )
> {
> QPainter p(this);
> p.setBrush(Qt::black); // set only this to Qt::blue, attempt a resize (no matter on \
> how many screens) and watch the result p.drawRect(geometry());
> }
>
> ** Q: "why"? - everything on top says "no paint events", so why is paintevent \
> implemented at all (it will for other reasons once shadow the \
> contents)
> ** Q: p.setPen(Qt::black)?
>
> Does anybody know about the legacy of this?
> Some Qt3 port that requires cleanup or is this to work-a-round special system \
> issues? Quite some of it also is only supported on X11, not Windows or MacOS and \
> i'm not sure about Wayland and Symbian.
> To test this, one btw. does not necessarily require a multiscreen setup - it's \
> sufficient to "xrandr -s 1024x768", lock screen, VT1, export DISPLAY=:0; xrandr -s \
> 0 and "sleep 5; pkill kscreenlocker_g" (or so) -> VT7, see lockwindow
suspend()/resume() seem to have been methods in the 4.9 krunner/lock to stop/start \
the 4.9 screensaver if e.g. it couldn't be seen.
The bitBlt comment was introduced in commit 71b8c4e239d1b9f7f4884d75afefda794e011034; \
the bitBlt use in resume() was removed/replaced in commit \
2a23308ce7fb6f5918b3f7c25ed3b2a70cbcc0e7.
- Oliver
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/108585/#review26205
-----------------------------------------------------------
On Jan. 25, 2013, 11:04 p.m., Thomas Lübking wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/108585/
> -----------------------------------------------------------
>
> (Updated Jan. 25, 2013, 11:04 p.m.)
>
>
> Review request for kwin, Plasma, Aaron J. Seigo, and Martin Gräßlin.
>
>
> Description
> -------
>
> Actually was wrong, we do get the signals from QDesktopWidget - so the fix is \
> pretty trivial ;-)
> Reg. bug #313835 i assume you're using some plasma screenlocker with widgets on it \
> (which has a translucent background when compositing is active and relies on the \
> lockwindow to cover the screen)
> I've not checked such screen"saver" and have to admit, i'd not even know where to \
> check for the sources.
>
> This addresses bug 313835.
> http://bugs.kde.org/show_bug.cgi?id=313835
>
>
> Diffs
> -----
>
> ksmserver/screenlocker/lockwindow.h 5cbc769
> ksmserver/screenlocker/lockwindow.cpp 147853b
>
> Diff: http://git.reviewboard.kde.org/r/108585/diff/
>
>
> Testing
> -------
>
> recompiled _all_ ksmserver, logged out, in, locked the screen, updated the screen \
> geometry ("arrrgghhh... geeezzz... goddamnfuckinghdmiinthedark"), killed the \
> gretter (noticed that i could have simply xrandr'd the geometry from VT1 as well - \
> "blast!")
> everything is nicely black (with compositing)
>
>
> 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/108585/">http://git.reviewboard.kde.org/r/108585/</a>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <p style="margin-top: 0;">On January 26th, 2013, 2:03 p.m. UTC, <b>Oliver \
Henshaw</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;">I don't have multiple monitors to test with, but can you test with \
the the LockWindow set to some colour other than black? Just so that any bizarre side \
effects are more obvious.</pre> </blockquote>
<p>On January 26th, 2013, 3:35 p.m. UTC, <b>Thomas Lübking</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;">What "bizarre side \
effects" would you expect? My screens are ok ;-P
(I could see the clock from the WM on where the exposed area would have been and that \
area was now black)
I'll try by a nice dodgerblue nevertheless.</pre>
</blockquote>
<p>On January 26th, 2013, 4:02 p.m. UTC, <b>Oliver Henshaw</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;">I wanted to be \
completely sure that it is the lockwindow that is covering the screen and not some \
other component. Perhaps that's overly paranoid, but I suppose we should err \
towards the paranoid.</pre> </blockquote>
<p>On January 26th, 2013, 4:32 p.m. UTC, <b>Thomas Lübking</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;">Turns nicely blue, i \
also debugged me the geometry and that the slot is caught (twice for the screecount \
change AND the resize)
Btw and while at it - the code is partially a bit "weird":
QPalette p = palette();
p.setColor(backgroundRole(), Qt::transparent); // this is what you got to turn blue
** Q: wtf is the background color "transparent" - this is black for 24bit, \
but guess what it is on a 32 drawable (hint: it's not pink)
--> Reason?
setPalette(p); // good
setAttribute(Qt::WA_PaintOnScreen, true); // bypasses doublebuffer, saves RAM - good
setAttribute(Qt::WA_NoSystemBackground, false); // iirc default, but good
setAttribute(Qt::WA_PaintOutsidePaintEvent, true); // for bitBlt in resume()
** Q: what ::resume() and what bitBlt? - bitBlt is afair not evel legally supported \
since Qt 4 and "grep -r resume *" in the screenlocker path is this lone and \
a label content.
void LockWindow::paintEvent(QPaintEvent* )
{
QPainter p(this);
p.setBrush(Qt::black); // set only this to Qt::blue, attempt a resize (no matter \
on how many screens) and watch the result p.drawRect(geometry());
}
** Q: "why"? - everything on top says "no paint events", so why \
is paintevent implemented at all (it will for other reasons once \
shadow the contents)
** Q: p.setPen(Qt::black)?
Does anybody know about the legacy of this?
Some Qt3 port that requires cleanup or is this to work-a-round special system issues?
Quite some of it also is only supported on X11, not Windows or MacOS and i'm not \
sure about Wayland and Symbian.
To test this, one btw. does not necessarily require a multiscreen setup - it's \
sufficient to "xrandr -s 1024x768", lock screen, VT1, export DISPLAY=:0; \
xrandr -s 0 and "sleep 5; pkill kscreenlocker_g" (or so) -> VT7, see \
lockwindow</pre> </blockquote>
</blockquote>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">suspend()/resume() seem \
to have been methods in the 4.9 krunner/lock to stop/start the 4.9 screensaver if \
e.g. it couldn't be seen.
The bitBlt comment was introduced in commit 71b8c4e239d1b9f7f4884d75afefda794e011034; \
the bitBlt use in resume() was removed/replaced in commit \
2a23308ce7fb6f5918b3f7c25ed3b2a70cbcc0e7.</pre> <br />
<p>- Oliver</p>
<br />
<p>On January 25th, 2013, 11:04 p.m. UTC, Thomas Lübking wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
style="background-image: \
url('http://git.reviewboard.kde.org/static/rb/images/review_request_box_top_bg.ab6f3b1072c9.png'); \
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<td>
<div>Review request for kwin, Plasma, Aaron J. Seigo, and Martin Gräßlin.</div>
<div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated Jan. 25, 2013, 11:04 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;">Actually was wrong, we do get the signals from QDesktopWidget - so the \
fix is pretty trivial ;-)
Reg. bug #313835 i assume you're using some plasma screenlocker with widgets on \
it (which has a translucent background when compositing is active and relies on the \
lockwindow to cover the screen)
I've not checked such screen"saver" and have to admit, i'd not even \
know where to check for the sources.</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;">recompiled _all_ ksmserver, logged out, in, locked the screen, updated \
the screen geometry ("arrrgghhh... geeezzz... \
goddamnfuckinghdmiinthedark"), killed the gretter (noticed that i could have \
simply xrandr'd the geometry from VT1 as well - "blast!")
everything is nicely black (with compositing)</pre>
</td>
</tr>
</table>
<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=313835">313835</a>
</div>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>ksmserver/screenlocker/lockwindow.h <span style="color: \
grey">(5cbc769)</span></li>
<li>ksmserver/screenlocker/lockwindow.cpp <span style="color: \
grey">(147853b)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/108585/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
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