https://bugs.kde.org/show_bug.cgi?id=476859
Bug ID: 476859
Summary: 2x scale region streams spanning 1x and 2x scale
screens downscale then upscale the 2x scale screen
Classification: Plasma
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: noaha...@gmail.com
Target Milestone: ---
SUMMARY
When doing region screencasting with an FHD@1x screen on the left, a 4K@2x
screen on the right and a stream scale of 2, you cannot actually get a 2x scale
stream of the 2x scale screen. If the recorded region is partly on the 1x scale
screen on the left, the 2x scale screen will appear to be downscaled to 1x
before being scaled back up to 2x.
STEPS TO REPRODUCE
1. Set a screen to the left at 1x scale and a screen to the right at 2x scale.
2. Start a region stream with 2x as the stream scale and the following region:
QRect(screensRect.width / 8, screensRect.height / 8, screensRect.width / 2,
screensRect.height / 2)
OBSERVED RESULT
The 2x scale screen will appear to be downscaled to 1x before being upscaled to
2x.
EXPECTED RESULT
The 2x scale screen should appear to be 2x scale.
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20231103
KDE Plasma Version: 5.81.0
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Kernel Version: 6.5.9-1-default (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 30.8 GiB of RAM
Graphics Processor: AMD Radeon Graphics
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