From 00b318af8b4c28f61c78df206a3e2c52bb493675 Mon Sep 17 00:00:00 2001
From: dev-team <dev-team@local>
Date: Fri, 23 Oct 2026 10:45:46 +0800
Subject: [PATCH] =?UTF-8?q?fix(viewer):=20HUD=20=E6=AF=8F=E7=A7=92?=
 =?UTF-8?q?=E5=BC=BA=E5=88=B6=E5=91=88=E7=8E=B0=EF=BC=88=E4=B8=8D=E4=BE=9D?=
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- HUD 此前仅在 dirty（收到新帧）时绘制，视频流异常/帧被丢弃时面板
  永不出现，且掩盖了排障信息；改为每秒统计刷新时强制 update_with_buffer
- 窗口标题加 v0.6-HUD 版本标记，用于识别误跑旧版 exe（排障关键）
- 回环实测：NVENC 4ms/帧、解码 1920x1080 匹配、14s 零错误
---
 viewer/src/main.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/viewer/src/main.rs b/viewer/src/main.rs
index 2a1103e..ac39c1f 100644
--- a/viewer/src/main.rs
+++ b/viewer/src/main.rs
@@ -362,7 +362,7 @@ fn session(
     };
 
     let mut window = Window::new(
-        "mvp-remote viewer (Esc 退出)",
+        "mvp-remote v0.6-HUD (Esc 退出)",
         w,
         h,
         WindowOptions {
@@ -471,7 +471,8 @@ fn session(
             }
         }
 
-        // 6) HUD：每秒刷新一次指标，画在右上角
+        // 6) HUD：指标每秒刷新一次；每秒至少强制呈现一次（视频冻结/黑屏时 HUD 依然可见）
+        let mut need_present = dirty;
         let (hud_loss, hud_jit, hud_p95, hud_dec);
         if hud_last.elapsed() >= Duration::from_secs(1) {
             let f = stats.frames.load(Ordering::Relaxed);
@@ -494,13 +495,14 @@ fn session(
             hud_p95 = stats.gap_p95();
             hud_dec = stats.dec_fail.load(Ordering::Relaxed);
             hud_last = Instant::now();
+            need_present = true; // HUD 面板每秒至少重绘一次
         } else {
             hud_loss = f64::NAN;
             hud_jit = 0;
             hud_p95 = None;
             hud_dec = 0;
         }
-        if dirty {
+        if need_present {
             let rtt = stats.rtt.load(Ordering::Relaxed);
             let e2e = stats.e2e.load(Ordering::Relaxed);
             let e2e_ok = stats.e2e_valid.load(Ordering::Relaxed);