From ed5ca01e47e487b6617575c0960751d3d638891b Mon Sep 17 00:00:00 2001
From: Henry Wurzburg <hwurzburg@yahoo.com>
Date: Fri, 10 Feb 2023 18:18:56 -0600
Subject: [PATCH] AP_OSD:add aspect ratio correction for DisplayPort

---
 libraries/AP_OSD/AP_OSD_Backend.h           | 4 ++--
 libraries/AP_OSD/AP_OSD_MSP_DisplayPort.cpp | 8 ++++++++
 libraries/AP_OSD/AP_OSD_MSP_DisplayPort.h   | 4 +++-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/libraries/AP_OSD/AP_OSD_Backend.h b/libraries/AP_OSD/AP_OSD_Backend.h
index b52cf9b701..30e638f1f1 100644
--- a/libraries/AP_OSD/AP_OSD_Backend.h
+++ b/libraries/AP_OSD/AP_OSD_Backend.h
@@ -26,7 +26,7 @@ class AP_OSD_Backend
 
 public:
     //constructor
-    AP_OSD_Backend(AP_OSD &osd): _osd(osd) {};
+    AP_OSD_Backend(AP_OSD &osd): _osd(osd) {}
 
     //destructor
     virtual ~AP_OSD_Backend(void) {}
@@ -51,7 +51,7 @@ public:
     virtual void clear()
     {
         blink_phase = (blink_phase+1)%4;
-    };
+    }
 
     // copy the backend specific symbol set to the OSD lookup table
     virtual void init_symbol_set(uint8_t *symbols, const uint8_t size);
diff --git a/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.cpp b/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.cpp
index 8a9191e8d8..0e46dfc2cd 100644
--- a/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.cpp
+++ b/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.cpp
@@ -133,4 +133,12 @@ AP_OSD_Backend *AP_OSD_MSP_DisplayPort::probe(AP_OSD &osd)
     }
     return backend;
 }
+ 
+// return a correction factor used to display angles correctly
+float AP_OSD_MSP_DisplayPort::get_aspect_ratio_correction() const
+{
+    return 12.0/18.0;
+}
+
+
 #endif
diff --git a/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.h b/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.h
index a273edd5db..2cc81eba27 100644
--- a/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.h
+++ b/libraries/AP_OSD/AP_OSD_MSP_DisplayPort.h
@@ -28,6 +28,8 @@ public:
     // used to initialize the uart in the correct thread
     void osd_thread_run_once() override;
 
+    // return a correction factor used to display angles correctly
+    float get_aspect_ratio_correction() const override;
 
 protected:
     uint8_t format_string_for_osd(char* dst, uint8_t size, bool decimal_packed, const char *fmt, va_list ap) override;
@@ -211,4 +213,4 @@ private:
 
     bool _blink_on;
 };
-#endif
\ No newline at end of file
+#endif