[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Postix]

https://bugs.kde.org/show_bug.cgi?id=390971

Postix  changed:

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Éric Brunet]

https://bugs.kde.org/show_bug.cgi?id=390971

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--- Comment #7 from Éric Brunet  ---
I have, I think, the same problem on my new computer (Dell XPS 13, Fedora 30,
okular 18.12.2, poppler 0.73.0)

The computer has a resolution 3840x2160 and Screen Scale is set at 2.5. Like
Eugene, I notice that it mostly happen with large windows. Okular even seems to
give up at some points and doesn't render parts of the page till I move again.

I have also put a file on
(this is the file pgfmanual.pdf in package texlive-pgf-doc)
look how rendering is flickering and how page 7 doesn't appear till I go up and
down again.

The computer is brand new, everything is going very smoothly with evince, so I
don't think the problem is a lack of CPU or RAM.

It works much better with Screen Scale set at 1.

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Eugene]

https://bugs.kde.org/show_bug.cgi?id=390971

--- Comment #6 from Eugene  ---
I've tested and it works properly with scaling set to 1.

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390971

--- Comment #5 from Henrik Fehlauer  ---
Thanks, I guess we'd need someone with such a high resolution display to try to
reproduce.

There's one more thing you could try: Does this also happen when you use the
same screen, but set scaling to 1x? This way we would know whether this is more
about the screen dimensions/pixmap size, or the special HiDPI rendering mode.

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Eugene]

https://bugs.kde.org/show_bug.cgi?id=390971

--- Comment #4 from Eugene  ---
Yes it's a 3840x2160 15" display; it happens with every input device I tried:
keyboard, trackpoint, touchpad.

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390971

--- Comment #3 from Henrik Fehlauer  ---
Hmh, cannot reproduce. I tried exactly the versions of Okular and Poppler as
well as the settings you mentioned, but there is absolutely no difference at
all between HiDPI and normal scaling, and even on my slow machine I don't have
such a huge delay.

+1 for showing the system load applet in your video, this way we see you are
not running out of RAM, so that's not the culprit.

I tried on a FullHD screen, but your screen resolution would be interesting to
know as well (looks like 4K?).

Also, how do you scroll exactly? Keyboard, mouse, touchpad?

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=390971

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Eugene]

https://bugs.kde.org/show_bug.cgi?id=390971

--- Comment #2 from Eugene  ---
poppler version: 0.61.1-1

The exact file doesn't really matter I guess, but yes the file you linked would
be nearly identical.

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[okular] [Bug 390971] Delayed content rendering during scrolling on a hidpi screen

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390971

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--- Comment #1 from Henrik Fehlauer  ---
Thanks for the report.

I guess a similar file would be this one?:
https://sourceforge.net/projects/manjarolinux/files/archive/17.0.1/Manjaro-17.0.1-User-Guide.pdf

Also, could you let us know your version of the Poppler library, please?
(Okular provides different rendering related features depending on the level of
support in that library.)

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