let width = if planeno == 0 { self.width } else { self.width >> 2 };
let height = if planeno == 0 { self.height } else { self.height >> 2 };
let src = if self.fbuf { &self.buf1[0..] } else { &self.buf2[0..] };
let width = if planeno == 0 { self.width } else { self.width >> 2 };
let height = if planeno == 0 { self.height } else { self.height >> 2 };
let src = if self.fbuf { &self.buf1[0..] } else { &self.buf2[0..] };