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  1. 03 Feb, 2020 2 commits
    • Vlad Zahorodnii's avatar
      [x11] Fix visual artifacts during interactive resize · 56d5f3a4
      Vlad Zahorodnii authored 
      Summary:
When a window is being interactively resized, its contents may jump. The
reason why that happens is because KWin renders partially resized client
window. Composite extension spec says that a window will get a new pixmap
each time it is resized or mapped. This applies to the frame window, but
not to the client window itself. If the client window is resized,
off-screen storage for the frame window won't be reallocated. Therefore,
KWin may render partially resized client window if the client doesn't
attempt to be in sync with our rendering loop. Currently, the only way
to do that is to use extended frame counters, which are not supported by
KWin.

So, in order to fix visual artifacts during interactive resize, we need
somehow forcefully re-allocate off-screen storage for the frame window.
Unfortunately, Composite extension doesn't provide any request to do
that, so the only option we have is to resize the frame window.

BUG: 415839
FIXED-IN: 5.18.0

Reviewers: #kwin

Subscribers: davidedmundson, ngraham, alexde, fredrik, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D26914
      56d5f3a4
    • Arjen Hiemstra's avatar
      ScreenEdge: Do not use localtime for measuring duration · 9b3d9e58
      Arjen Hiemstra authored 
      Summary:
QDateTime::fromMSecSinceEpoch uses Qt::LocalTime by default. This involves an
expensive localtime conversion. So instead force things to use UTC, as there
is no need for timezone information when tracking durations.

This is especially noticeable on Bedrock Linux, which uses a Fuse mounted
/etc, which is slower than a plain /etc and causes quite some slowdown there.
See https://github.com/bedrocklinux/bedrocklinux-userland/issues/140 for
details.

Test Plan: The screenedge unit test still passes.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: zzag, anthonyfieroni, davidedmundson, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D27114
      9b3d9e58
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