Fix MacOSX compile error

application/remote_desk/screen_capture/linux/screen_capture_wgc.h

@@ -0,0 +1,56 @@
+#ifndef _SCREEN_CAPTURE_WGC_H_
+#define _SCREEN_CAPTURE_WGC_H_
+
+#include <atomic>
+#include <functional>
+#include <string>
+#include <thread>
+
+typedef struct {
+  int left;
+  int top;
+  int right;
+  int bottom;
+} RECORD_DESKTOP_RECT;
+
+typedef std::function<void(unsigned char *, int, int, int)> cb_desktop_data;
+typedef std::function<void(int)> cb_desktop_error;
+
+class ScreenCaptureWgc {
+ public:
+  ScreenCaptureWgc();
+  ~ScreenCaptureWgc();
+
+ public:
+  bool IsWgcSupported();
+
+  int Init(const RECORD_DESKTOP_RECT &rect, const int fps, cb_desktop_data cb);
+
+  int Start();
+  int Pause();
+  int Resume();
+  int Stop();
+
+  void OnFrame();
+
+ protected:
+  void CleanUp();
+
+ private:
+  std::atomic_bool _running;
+  std::atomic_bool _paused;
+  std::atomic_bool _inited;
+
+  std::thread _thread;
+
+  std::string _device_name;
+
+  RECORD_DESKTOP_RECT _rect;
+
+  int _fps;
+
+  cb_desktop_data _on_data;
+  cb_desktop_error _on_error;
+};
+
+#endif