https://bugs.kde.org/show_bug.cgi?id=490461
Bug ID: 490461
Summary: Display KCM: Overscan SpinBox should visualize a live
preview of screen corners
Classification: Plasma
Product: KScreen
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: m...@ratijas.tk
Target Milestone: ---
SUMMARY
Editing the Overscan setting of a display is a trial-and-error process because
there is currently no interactive feedback on how the screen is going to look
like which such setting applied.
Let's say this straight: Nintendo Switch operating system provides an amazing
screen for overscan adjustment; you can find it by searching for "Nintendo
Switch overscan", for example here: https://www.youtube.com/watch?v=O_h4eexYrqM
So, KScreen in tandem with KWin effects should show some realtime feedback,
like those huge 90° angled arrows pointing at the to-be-applied corners of the
screen.
There are some concerns though.
First, the overscan values are not standardized, and the meaning of those
percents vary between vendors and models. Sounds like it's not a KDE's job to
maintain a quirks database for all the GPU models, so it's probably up to the
kernel to eventually provide some uniform and well-defined range of values.
There are some plans for indeterminate future to implement overscan in KWin
internally, which would not suffer from the aforementioned issue.
Second, from graphics point of view, if the cutoff is applied at a driver
level, then it would only be possible to preview the shrinking but not the
expanding of the drawable area. If an internal overscan is implemented in KWin
but not used by default, then it could switch on the fly while the preview
effect is active, and then switch back; but that leads us back to
non-standardized values as described above.
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