GCS_MAVLink: move handling of visual odometry messages up

libraries/GCS_MAVLink/GCS.h

@@ -20,6 +20,7 @@
 #include <AP_ServoRelayEvents/AP_ServoRelayEvents.h>
 #include <AP_Camera/AP_Camera.h>
 #include <AP_AdvancedFailsafe/AP_AdvancedFailsafe.h>
+#include <AP_VisualOdom/AP_VisualOdom.h>
 #include <AP_Common/AP_FWVersion.h>
 
 // check if a message will fit in the payload space available
@@ -231,6 +232,7 @@ protected:
     virtual class AP_Camera *get_camera() const = 0;
     virtual AP_ServoRelayEvents *get_servorelayevents() const = 0;
     virtual AP_AdvancedFailsafe *get_advanced_failsafe() const { return nullptr; };
+    virtual AP_VisualOdom *get_visual_odom() const { return nullptr; }
     virtual bool set_mode(uint8_t mode) = 0;
     virtual const AP_FWVersion &get_fwver() const = 0;
     virtual void set_ekf_origin(const Location& loc) = 0;
@@ -273,6 +275,7 @@ protected:
     void handle_gimbal_report(AP_Mount &mount, mavlink_message_t *msg) const;
     void handle_radio_status(mavlink_message_t *msg, DataFlash_Class &dataflash, bool log_radio);
     void handle_serial_control(const mavlink_message_t *msg);
+    void handle_vision_position_delta(mavlink_message_t *msg);
 
     void handle_common_message(mavlink_message_t *msg);
     void handle_set_gps_global_origin(const mavlink_message_t *msg);

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -1863,7 +1863,15 @@ void GCS_MAVLINK::handle_data_packet(mavlink_message_t *msg)
 #endif
 }
 
+void GCS_MAVLINK::handle_vision_position_delta(mavlink_message_t *msg)
+{
+    AP_VisualOdom *visual_odom = get_visual_odom();
+    if (visual_odom == nullptr) {
+        return;
+    }
 
+    visual_odom->handle_msg(msg);
+}
 
 /*
   handle messages which don't require vehicle specific data
@@ -1983,6 +1991,10 @@ void GCS_MAVLINK::handle_common_message(mavlink_message_t *msg)
     case MAVLINK_MSG_ID_DATA96:
         handle_data_packet(msg);
         break;        
+
+    case MAVLINK_MSG_ID_VISION_POSITION_DELTA:
+        handle_vision_position_delta(msg);
+        break;
     }
 
 }