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fix(host/stream): composite mode re-blends the LIVE cursor on repeat ticks

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The frame-attached overlay is the pointer position at the last damage
frame; repeats re-encoding a static desktop froze the blended cursor
between redraws — on-glass the composite-mode cursor stuttered while
window drags (constant damage) were smooth. Refresh the repeat's overlay
from Capturer::cursor each tick so pointer-only motion re-blends at tick
rate — the bandwidth the pre-channel embedded mode already paid. Linux
only: the Windows capturer composites internally and its frames must
never carry an overlay a blend path would double-draw.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
enricobuehler
2026-07-22 23:47:53 +02:00
co-authored by Claude Fable 5
parent 088004cac4
commit 4436c7fb61
1 changed files with 14 additions and 0 deletions
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crates/punktfunk-host/src/native/stream.rs
+14
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@@ -2063,6 +2063,20 @@ pub(super) fn virtual_stream(ctx: SessionContext, prepared: Option<PreparedDispl
); );
// The client draws the pointer — a blend-capable encoder must not also draw it. // The client draws the pointer — a blend-capable encoder must not also draw it.
frame.cursor = None; frame.cursor = None;
} else {
// Host composites (Linux): the encoder blend IS the composite mechanism, but the
// frame-attached overlay is the position at the LAST DAMAGE frame — repeats
// re-encoding a static desktop froze the blended pointer between redraws
// (on-glass: composite cursor stuttered while window drags, constant damage,
// were smooth). Refresh the repeat's overlay from the capturer's LIVE cursor so
// pointer-only motion re-blends at tick rate — the same bandwidth the pre-channel
// embedded mode paid, where the compositor damaged frames for cursor moves.
// NOT Windows: its capturer composites internally (cursor_blend.rs) and frames
// must never carry an overlay a blend path would double-draw.
#[cfg(not(target_os = "windows"))]
if let Some(live) = capturer.cursor() {
frame.cursor = Some(live);
}
} }
} }
// The overlay surfaces hidden pointers too (for the hint above) — strip them // The overlay surfaces hidden pointers too (for the hint above) — strip them