Add an option to cast a single application window instead of a whole monitor, so private things on the rest of the screen (IDE, messengers, notifications) never reach the TV.
Right now FluxCast captures a whole output, so everything on that monitor goes to the TV. Casting one window is the cleanest privacy option on KDE/GNOME Wayland, and the portal already supports it.
The portal ScreenCast interface can hand fluxcast a window source, i just don't request it yet.
src/portal_capture.py: SelectSources types is 5 (Monitor|Virtual). Add Window (bit 2) -> 7, ideally behind an opt-in flag so normal casting stays unchanged.src/wfd.py _start_desktop_portal: it currently scales the pipewiresrc straight into the negotiated resolution. A window is an arbitrary size and can resize mid-stream, so it needs compositing onto a black canvas at the negotiated resolution (aspect-preserving letterbox, e.g. videoscale add-borders / videobox) with caps renegotiation on resize.
Separate from the virtual-desktop / headless-output idea (tracked separately), this one is purely portal window capture!!!
Credit: this was raised by users on Habr, yursdan asked about keeping private windows off the TV, and eri pointed at exactly this approach (portal ScreenCast window source + gstreamer compositing onto a black canvas).
Add an option to cast a single application window instead of a whole monitor, so private things on the rest of the screen (IDE, messengers, notifications) never reach the TV.
Right now FluxCast captures a whole output, so everything on that monitor goes to the TV. Casting one window is the cleanest privacy option on KDE/GNOME Wayland, and the portal already supports it.
The portal ScreenCast interface can hand fluxcast a window source, i just don't request it yet.
src/portal_capture.py: SelectSourcestypesis5(Monitor|Virtual). Add Window (bit 2) ->7, ideally behind an opt-in flag so normal casting stays unchanged.src/wfd.py_start_desktop_portal: it currently scales the pipewiresrc straight into the negotiated resolution. A window is an arbitrary size and can resize mid-stream, so it needs compositing onto a black canvas at the negotiated resolution (aspect-preserving letterbox, e.g. videoscale add-borders / videobox) with caps renegotiation on resize.Separate from the virtual-desktop / headless-output idea (tracked separately), this one is purely portal window capture!!!
Credit: this was raised by users on Habr, yursdan asked about keeping private windows off the TV, and eri pointed at exactly this approach (portal ScreenCast window source + gstreamer compositing onto a black canvas).