user32::UpdateLayeredWindow

pub unsafe extern "system" fn UpdateLayeredWindow(hWnd: HWND, hdcDst: HDC, pptDst: *mut POINT, psize: *mut SIZE, hdcSrc: HDC, pptSrc: *mut POINT, crKey: COLORREF, pblend: *mut BLENDFUNCTION, dwFlags: DWORD) -> BOOL