https://bugs.kde.org/show_bug.cgi?id=386936
Bug ID: 386936
Summary: Native wayland applications scaling
Product: kwin
Version: unspecified
Platform: unspecified
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: kiv.ap...@gmail.com
Target Milestone: ---
KDE 5.11 has good support for scaling applications when using display
configurations with different DPI. The application can be scaled up or down and
it's very cool.
However, there is one important flaw. As I understand it, Wayland lets you tell
native applications about changing DPI while dragging between monitors. Anyway
it works in Gnome. If I drag, for example, gedit (an application that does not
use xwayland), it does not scale the bitmap, but changes its real DPI when most
of it reaches another monitor. This is a much better behavior, because it does
not lose image quality and do not consume unnecessary computing resources for
scaling.
It would be nice to add support for this protocol to kwin, since this would be
a very important step to support High DPI, no less important than what has
already been done. After all, raster scaling significantly degrades the quality
and should be avoided if there is a possibility to change DPI on the fly by
simply asking the application about it.
Of course, for xwayland applications, it only remains to apply the current
approach with raster scaling. This is quite good (and, as far as I know, at the
moment on Linux only KDE can do it).
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