internal extern static unsafe int DescribePixelFormat(IntPtr hdc, int ipfd, UInt32 cjpfd, Gdi.PIXELFORMATDESCRIPTOR *ppfd);
internal extern static unsafe Boolean SetPixelFormat(IntPtr hdc, int ipfd, Gdi.PIXELFORMATDESCRIPTOR *ppfd);
internal extern static unsafe int ChoosePixelFormat(IntPtr hDc, Gdi.PIXELFORMATDESCRIPTOR *pPfd);