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fix(host/windows): WGC relay — don't force HDR on SDR sessions across the secure mux

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Re-enabling the WGC relay brought back a broken image on the secure->normal
switch. Log root cause: on returning to the normal desktop the relay called
set_advanced_color(target, true) to 'restore HDR', so the rebuilt WGC helper
captured HDR FP16 BT.2020 PQ while the session encoder is 8-bit SDR -> format
mismatch (the 'HDR gets restored when flipping back to WGC' bug).

Gate BOTH set_advanced_color toggles on bit_depth>=10. An SDR (8-bit) session
now stays SDR across WGC<->DDA switches (no HDR force, no needless topology
change); HDR sessions keep the drop-on-secure / restore-on-normal behavior.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-06-16 17:13:02 +00:00
parent f469dfcc76
commit d2e536d299
1 changed files with 21 additions and 14 deletions
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crates/punktfunk-host/src/m3.rs
+21 -14
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@@ -2541,17 +2541,20 @@ fn virtual_stream_relay(
"two-process: source switch"
);
if secure {
// SDR-while-secure: drop the SudoVDA out of HDR so the secure (Winlogon) desktop
// renders SDR/composed — the HDR fullscreen independent-flip is what made DDA storm
// ACCESS_LOST (black). Give the reconfig a moment to settle, then (re)open DDA fresh on
// the now-SDR output.
let toggled = unsafe {
crate::vdisplay::sudovda::set_advanced_color(target.target_id, false)
};
if toggled {
std::thread::sleep(std::time::Duration::from_millis(250));
// SDR-while-secure (HDR sessions ONLY): drop the SudoVDA out of HDR so the secure
// (Winlogon) desktop renders SDR/composed — HDR fullscreen independent-flip is what made
// DDA storm ACCESS_LOST (black). For an SDR (8-bit) session the output is already SDR, so
// toggling is a needless topology change AND its matching restore on the way back would
// force the desktop into HDR the 8-bit encoder can't take (broken image).
if bit_depth >= 10 {
let toggled = unsafe {
crate::vdisplay::sudovda::set_advanced_color(target.target_id, false)
};
if toggled {
std::thread::sleep(std::time::Duration::from_millis(250));
}
}
dda = None; // reopen so we capture the post-toggle (SDR) output
dda = None; // reopen so we capture the (SDR) output
match open_dda(&target, cur_mode.width, cur_mode.height, effective_hz) {
Ok(mut p) => {
p.enc.request_keyframe();
@@ -2564,10 +2567,14 @@ fn virtual_stream_relay(
}
next = std::time::Instant::now();
} else {
// Returning to the normal desktop: restore HDR on the SudoVDA (WGC captures it HDR), then
// rebuild the helper fresh so its WGC re-detects the restored colorspace, and resume.
unsafe {
crate::vdisplay::sudovda::set_advanced_color(target.target_id, true);
// Returning to the normal desktop: restore HDR on the SudoVDA (HDR sessions ONLY — WGC
// then captures it HDR). An SDR (8-bit) session must stay SDR; forcing HDR here is what
// made the rebuilt WGC helper capture HDR FP16 BT.2020 while the encoder is 8-bit SDR →
// format mismatch / broken image (the "HDR gets restored when flipping back" bug).
if bit_depth >= 10 {
unsafe {
crate::vdisplay::sudovda::set_advanced_color(target.target_id, true);
}
}
dda = None; // free the secure DDA encoder
match build(&mut vd, cur_mode) {