Fix(cursor): correct trace cursor position on multi-monitor capture

client/ScreenCapture.h

@@ -639,11 +639,10 @@ public:
         // 写入算法类型
         data[0] = algo;
 
-        // 写入光标位置
+        // 写入光标位置（虚拟桌面绝对坐标 → 发送坐标系）
         POINT CursorPos;
         GetCursorPos(&CursorPos);
-        CursorPos.x /= m_wZoom;
-        CursorPos.y /= m_hZoom;
+        PointConversionInverse(CursorPos);
         memcpy(data + 1, &CursorPos, sizeof(POINT));
 
         // 写入当前光标类型（支持自定义光标）
@@ -851,11 +850,10 @@ public:
         // 写入使用了哪种算法
         memcpy(data, (LPBYTE)&algo, sizeof(BYTE));
 
-        // 写入光标位置
+        // 写入光标位置（虚拟桌面绝对坐标 → 发送坐标系）
         POINT	CursorPos;
         GetCursorPos(&CursorPos);
-        CursorPos.x /= m_wZoom;
-        CursorPos.y /= m_hZoom;
+        PointConversionInverse(CursorPos);
         memcpy(data + sizeof(BYTE), (LPBYTE)&CursorPos, sizeof(POINT));
 
         // 写入当前光标类型（支持自定义光标）
@@ -1025,6 +1023,26 @@ public:
         pt.y += m_iScreenY;
     }
 
+    // 鼠标位置反向转换：将客户端绝对坐标（GetCursorPos）转换为发送坐标系，逐项是 PointConversion 的逆
+    virtual void PointConversionInverse(POINT& pt) const
+    {
+        // 3'. 减去屏幕偏移（多显示器）
+        pt.x -= m_iScreenX;
+        pt.y -= m_iScreenY;
+        // 2'. 反向 DPI 缩放
+        if (m_bZoomed) {
+            pt.x = (LONG)(pt.x / m_wZoom);
+            pt.y = (LONG)(pt.y / m_hZoom);
+        }
+        // 1'. full → send 缩放（位图下采样传输时）
+        int sendWidth = m_BitmapInfor_Send->bmiHeader.biWidth;
+        int sendHeight = m_BitmapInfor_Send->bmiHeader.biHeight;
+        if (sendWidth != (int)m_ulFullWidth || sendHeight != (int)m_ulFullHeight) {
+            pt.x = (LONG)((double)pt.x * sendWidth / m_ulFullWidth + 0.5);
+            pt.y = (LONG)((double)pt.y * sendHeight / m_ulFullHeight + 0.5);
+        }
+    }
+
     // 获取位图结构信息
     virtual const LPBITMAPINFO& GetBIData() const
     {