[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Unknown]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Simon Andric via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Martin Sandsmark via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #26 from Martin Sandsmark  ---
the Qt bug report was linked above, and was closed with this:
https://codereview.qt-project.org/#/c/166532

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #25 from Sven Brauch  ---
Can you link to the upstream change which fixed this issue?

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Antonio Rojas via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Martin Sandsmark via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

Martin Sandsmark  changed:

   What|Removed |Added

 Resolution|--- |UPSTREAM
 Status|CONFIRMED   |RESOLVED

--- Comment #24 from Martin Sandsmark  ---
Which fonts are you using?

However, it seems to be fixed upstream in Qt, so I'm closing this.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Martin Sandsmark via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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--- Comment #23 from Martin Sandsmark  ---
how is the API usage strange? it just calls QPainter::drawText().

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Alexander Miroshnichenko via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #22 from Sven Brauch  ---
Can we maybe fix this in konsole instead? Its use of the API does seem strange
judging from what you describe.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #21 from Sven Brauch  ---
Cool, many thanks for investigating this! Your fix looks sensible to me (if the
glyph height is zero there is nothing to do), but I'm not really qualified to
review it. Did you submit it to the Qt code review system? In the bug tracker
it will probably get lost ... people don't review patches there.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #20 from Viktor Kuzmin  ---
I had no time currently to investigate problem completely -> this patch is
'hack' for me right now. Will have more time next week. Anyway I have normal
cpu usage in konsole (5-7% one core max) and I see no glitches.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #19 from Viktor Kuzmin  ---
https://bugreports.qt.io/browse/QTBUG-49452

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Antonio Rojas via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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--- Comment #18 from Antonio Rojas  ---
(In reply to Viktor Kuzmin from comment #17)
> Already done.

Link, please?

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #17 from Viktor Kuzmin  ---
Already done.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #16 from Sven Brauch  ---
If that indeed improves things, you should definitely submit it to Qt. Here is
not a good place for it :)

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #15 from Viktor Kuzmin  ---
It seems that konsole renders lot's of 'spaces' and glyph height is zero in
that case. I've created small hacky patch and performance is OK now. Also I've
not noticed any artifacts. Sorry if I'm mistaken, this is my first time I'm in
touch with qt in any way.

diff -r 6c0e7b4f5bc5 src/gui/text/qfontengine_ft.cpp
— a/src/gui/text/qfontengine_ft.cpp Fri Jul 08 13:10:54 2016 +0300
+++ b/src/gui/text/qfontengine_ft.cpp Fri Jul 08 13:13:55 2016 +0300
@@ -1756,6 +1756,9 @@
Glyph *glyph = loadGlyphFor(glyphIndex, subPixelPosition, neededFormat, t);
+ if (glyph != 0 && glyph->height == 0)
+ return 
+
if (offset != 0 && glyph != 0)
*offset = QPoint(glyph->x, glyph>y);

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #14 from Viktor Kuzmin  ---
Any chances for fix :(
Bug is still here...

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Dmitry via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[cpon via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Teet Talviste via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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--- Comment #13 from Teet Talviste  ---
I also see excess cpu usage. Moving cursor in vim produces high cpu usage, and
stutters a bit, enough to be extremely annoying. Using QT5.6.0 and konsole
15.12.3.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #11 from Viktor Kuzmin  ---
Bug still exists. I'm using gentoo ~x64. I've tried both konsole-4 and latest
konsole. My test is to launch top in konsole and to constantly make text
selection. konsole-4 eats less then 5% of cpu while latest konsole eats more
then 50% cpu.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

Sven Brauch  changed:

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 Status|UNCONFIRMED |CONFIRMED
 Ever confirmed|0   |1

--- Comment #12 from Sven Brauch  ---
I also have not noticed improvements with this. it might be related to the
theme, I'll check.

I will set this to confirmed as several users are affected and I can clearly
link this issue to infinality on two machines.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[wojtek via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #10 from wojtek  ---
Strange. I'm still using qt.5.5.1 but I'm not able to reproduce this bug
anymore.
I have strange feeling that breeze style was the root this problem.

For example this commit resolved slow startup and memory leak

https://quickgit.kde.org/?p=breeze.git=commitdiff=2cae9359188af85ac884e2709c17592bc67b0e73

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #9 from Sven Brauch  ---
Any news on this? Currently I have the choice between ugly and dog-slow font
rendering, which is really annoying. :(

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Viktor Kuzmin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #7 from Viktor Kuzmin  ---
konsole-4 have no problems with infinality. Also getting rid of infinality is
really not an option IMHO.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

--- Comment #8 from Sven Brauch  ---
Yes I guess this is a Qt5.5+ bug, no?

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[Sven Brauch via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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--- Comment #6 from Sven Brauch  ---
Same issue here, I can confirm the fix as well.

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[konsole] [Bug 354082] high cpu usage for screen redrawing with qt5.5

[rindeal via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354082

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