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punktfunk/crates/pf-vdisplay
enricobuehlerandClaude Fable 5 1f59498c5c
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fix(host/linux): a no-channel session composites the metadata cursor — Mutter never embeds on a virtual stream
The capture-latched client (console.rs latched_mouse) never advertises
CLIENT_CAP_CURSOR, so its session resolved cursor_blend=false and asked
Mutter to EMBED the pointer. On a Mutter virtual stream that is a
fiction: since Mutter 48 (7ff5334a, hw-cursor inhibition removed) the
software cursor overlay is suppressed stage-globally whenever any
physical head realizes a HW cursor — dmabuf-recorded frames blit the
view without a pointer, and cursor-only motion schedules no re-record
either (mutter#4939). Probed on-glass on Mutter 50.3: embedded +
relative motion = frozen frame counter; SPA_META_Cursor positions kept
flowing in the same setup.

So the no-channel session now takes the path that was verified end to
end: cursor-as-metadata + the host composites, permanently — the same
arm a channel session lands in after its capture-model flip. Embedded
remains only the can't-blend fallback (libav VAAPI/NVENC, software).

- session_plan::cursor_blend_for grows the no-channel arm (codec +
  depth in, the same CUDA-payload prediction handshake makes);
  gamescope excluded so patch-2+ keeps its native-NV12 zero-copy shape
- the encode loop's composite refresh + one-shot breadcrumbs now cover
  the no-channel session; the park schedule keeps retrying while its
  composite is starved (relative-only clients cannot park themselves)
- the compositor retarget re-applies set_hw_cursor — the rebuilt
  display used to come up EMBEDDED even for channel sessions
- the GameStream virtual source takes the same rule (it never has a
  channel); its stream_body blend flag mirrors the request
- punktfunk-probe grows --cursor-nochannel (the latched-capture client,
  headless); cursor-probe grows --dump (PPM frames + a content-change
  counter, the pixel evidence the embedded A/B lacked)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-30 00:35:25 +02:00
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