Support screen capture on MacOS

src/screen_capture/macosx/x11_session.h

@@ -0,0 +1,37 @@
+#ifndef _X11_SESSION_H_
+#define _X11_SESSION_H_
+
+class X11Session {
+ public:
+  struct x11_session_frame {
+    unsigned int width;
+    unsigned int height;
+    unsigned int row_pitch;
+
+    const unsigned char *data;
+  };
+
+  class x11_session_observer {
+   public:
+    virtual ~x11_session_observer() {}
+    virtual void OnFrame(const x11_session_frame &frame) = 0;
+  };
+
+ public:
+  virtual void Release() = 0;
+
+  virtual int Initialize() = 0;
+
+  virtual void RegisterObserver(x11_session_observer *observer) = 0;
+
+  virtual int Start() = 0;
+  virtual int Stop() = 0;
+
+  virtual int Pause() = 0;
+  virtual int Resume() = 0;
+
+ protected:
+  virtual ~X11Session(){};
+};
+
+#endif