DirectDraw is part of Microsoft's DirectX API. DirectDraw is used to render graphics in applications where top performance is important. It support YUV422 display if the graphic card in computer supports it. One YUV422 format is YUY2. An example implementation is DirectDraw Overlay Library.
YUY2 is another in the family of YUV 4:2:2 formats and appears to be used by all the same codecs as UYVY.
|Y Sample Period||1||1|
|V Sample Period||2||1|
|U Sample Period||2||1|
Effective bits per pixel : 16
Positive biHeight implies top-down image (top line first)