The RGBA_GETBLUE macro retrieves the blue component of an RGBA D3DCOLOR value.
RGBA_GETBLUE(rgb)    ((rgb) & 0xff) 
 The macros returns the blue component.
  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in d3dtypes.h.