inner-pipe

src/Oh.My.Stitcher/Program.cs

@@ -1,3 +1,4 @@
+using System.Buffers;
 using System.IO.Pipelines;
 using Microsoft.AspNetCore.Http.Json;
 using NetVips;
@@ -34,7 +35,28 @@ app.MapPost("/api/image/generate", (Stitch request) =>
     try
     {
       using Image image = Tile.Create(in request, tilesDirectory, images, logger);
-      image.WriteToStream(pipe.Writer.AsStream(), ".png");
+      Pipe innerPipe = new();
+      _ = Task.Run(async () =>
+      {
+        while( true )
+        {
+          ReadResult result = await innerPipe.Reader.ReadAsync();
+          ReadOnlySequence<byte> buffer = result.Buffer;
+          if(!buffer.IsEmpty )
+          {
+            foreach( ReadOnlyMemory<byte> segment in buffer )
+            {
+              await pipe.Writer.WriteAsync(segment);
+            }
+            innerPipe.Reader.AdvanceTo(buffer.End);
+            if (result.IsCompleted)
+            {
+              break;
+            }
+          }
+        }
+      });
+      image.WriteToStream(innerPipe.Writer.AsStream(), ".png");
     }
     catch( Exception e )
     {