From 2d17ff0de3931a1ab20d5c7dd75db9c6bf999fc8 Mon Sep 17 00:00:00 2001
From: Vinzenz Schroeter <vinzenz.f.s@gmail.com>
Date: Fri, 19 Apr 2024 13:40:26 +0200
Subject: [PATCH] fix display binary format

---
 DisplayCommands/Internals/DisplayConnection.cs |  5 ++++-
 DisplayCommands/Internals/HeaderWindow.cs      | 14 +++++++++++++-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/DisplayCommands/Internals/DisplayConnection.cs b/DisplayCommands/Internals/DisplayConnection.cs
index 466aa1c..4505d95 100644
--- a/DisplayCommands/Internals/DisplayConnection.cs
+++ b/DisplayCommands/Internals/DisplayConnection.cs
@@ -15,6 +15,7 @@ internal sealed class DisplayConnection(IOptions<DisplayConfiguration> options)
     public ValueTask SendClearAsync()
     {
         var header = new HeaderWindow { Command = DisplayCommand.Clear };
+
         return SendAsync(header, Memory<byte>.Empty);
     }
 
@@ -28,6 +29,7 @@ internal sealed class DisplayConnection(IOptions<DisplayConfiguration> options)
             PosX = x,
             PosY = y
         };
+
         return SendAsync(header, grid.Data);
     }
 
@@ -81,7 +83,7 @@ internal sealed class DisplayConnection(IOptions<DisplayConfiguration> options)
         {
             Command = DisplayCommand.BitmapLinearWin,
             PosX = x, PosY = y,
-            Width = pixels.Width,
+            Width = (ushort)(pixels.Width / 8),
             Height = pixels.Height
         };
 
@@ -111,6 +113,7 @@ internal sealed class DisplayConnection(IOptions<DisplayConfiguration> options)
         var buffer = _arrayPool.Rent(messageSize);
         var message = buffer.AsMemory(0, messageSize);
 
+        header.ChangeToNetworkOrder();
         MemoryMarshal.Write(message.Span, header);
         payload.CopyTo(message[headerSize..]);
 
diff --git a/DisplayCommands/Internals/HeaderWindow.cs b/DisplayCommands/Internals/HeaderWindow.cs
index 05d5541..fcb9176 100644
--- a/DisplayCommands/Internals/HeaderWindow.cs
+++ b/DisplayCommands/Internals/HeaderWindow.cs
@@ -1,3 +1,4 @@
+using System.Buffers.Binary;
 using System.Runtime.InteropServices;
 
 namespace DisplayCommands.Internals;
@@ -14,4 +15,15 @@ internal struct HeaderWindow
     public ushort Width;
 
     public ushort Height;
-}
\ No newline at end of file
+
+    public void ChangeToNetworkOrder()
+    {
+        if (!BitConverter.IsLittleEndian)
+            return;
+        Command = (DisplayCommand)BinaryPrimitives.ReverseEndianness((ushort)Command);
+        PosX = BinaryPrimitives.ReverseEndianness(PosX);
+        PosY = BinaryPrimitives.ReverseEndianness(PosY);
+        Width = BinaryPrimitives.ReverseEndianness(Width);
+        Height = BinaryPrimitives.ReverseEndianness(Height);
+    }
+}