https://bugs.kde.org/show_bug.cgi?id=525473
Bug ID: 525473
Summary: Screen sharing does not work when KWin uses software
rendering
Classification: Plasma
Product: kwin
Version First 6.6.6
Reported In:
Platform: Other
OS: FreeBSD
Status: REPORTED
Severity: normal
Priority: NOR
Component: screencasting
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 195939
--> https://bugs.kde.org/attachment.cgi?id=195939&action=edit
whole-screen capture with the QPainter compositor.
Hello,
I am running Plasma 6.6.6 with Wayland inside a FreeBSD 15.1 QEMU VM. The VM
does not have a working DRM render device, so KWin uses the QPainter software
renderer.
The desktop itself works, but screen sharing does not. This means KRDP cannot
capture the desktop. KWin’s screencast code currently only allows the OpenGL
compositor and requires an EGL context. I checked the current master branch,
and it appears to have the same limitation.
I made a small patch that allows whole-screen capture with the QPainter
compositor. It renders directly into PipeWire’s shared-memory image instead of
creating an OpenGL texture. With this patch, KRDP can display the Plasma
desktop and software H.264 encoding works.
The patch currently supports whole-screen and virtual-output capture. Window
and region capture still require OpenGL.
Would KWin be interested in supporting this software-rendered screen-capture
path?
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