Feature: Linux/macOS server-identity gate via libsign.a

fix remote-cursor flicker on Windows controller

server/2015Remote/ScreenSpyDlg.cpp

@@ -499,6 +499,7 @@ BEGIN_MESSAGE_MAP(CScreenSpyDlg, CDialog)
     ON_WM_LBUTTONDBLCLK()
     ON_WM_ACTIVATE()
     ON_WM_TIMER()
+    ON_WM_ERASEBKGND()
     ON_COMMAND(ID_EXIT_FULLSCREEN, &CScreenSpyDlg::OnExitFullscreen)
     ON_COMMAND(ID_SHOW_STATUS_INFO, &CScreenSpyDlg::OnShowStatusInfo)
     ON_COMMAND(ID_HIDE_STATUS_INFO, &CScreenSpyDlg::OnHideStatusInfo)
@@ -1608,6 +1609,19 @@ bool CScreenSpyDlg::Decode(LPBYTE Buffer, int size)
     return false;
 }
 
+// 跳过默认背景擦除：随帧重绘时若先 FillRect 灰色再 BitBlt 帧，会在两步之间
+// 出现"瞬时灰背景"，启用远程光标(应用层 DrawIconEx)时尤其明显——光标随每帧重绘，
+// 灰一闪 → 帧覆盖 → 重画光标，循环看上去就是光标频繁闪烁。
+// adaptive/zoom 模式下 BitBlt/StretchBlt 覆盖整个客户区，本就不需要先擦；
+// m_bIsFirst（首帧未到达）仍走默认擦除以避免显示残留内容。
+BOOL CScreenSpyDlg::OnEraseBkgnd(CDC* pDC)
+{
+    if (m_bIsFirst) {
+        return __super::OnEraseBkgnd(pDC);
+    }
+    return TRUE;
+}
+
 void CScreenSpyDlg::OnPaint()
 {
     if (m_bIsClosed) return;

server/2015Remote/ScreenSpyDlg.h

@@ -356,6 +356,7 @@ public:
     virtual BOOL OnInitDialog();
     afx_msg void OnClose();
     afx_msg void OnPaint();
+    afx_msg BOOL OnEraseBkgnd(CDC* pDC);
     BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
     afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
     virtual BOOL PreTranslateMessage(MSG* pMsg);