The following example demonstrates drawing a bitmap into a metafile. Example:

procedure TForm .Button Click(Sender: TObject);
 var
   m : TmetaFile;
   mc : TmetaFileCanvas;
   b : tbitmap;
begin
  m := TMetaFile.Create;
  b := TBitmap.create;
  b.LoadFromFile('C:\SomePath\SomeBitmap.BMP');
  m.Height := b.Height;
  m.Width := b.Width;
  mc := TMetafileCanvas.Create(m, 0);
  mc.Draw(0, 0, b);
  mc.Free;
  b.Free;
  m.SaveToFile('C:\SomePath\Test.emf');
  m.Free;
  Image .Picture.LoadFromFile('C:\SomePath\Test.emf');
end;