func drawPixels(img *image.Alpha, px, py, pw, ph uint, fill bool) { var x, y uint for y = 0; y < ph; y++ { for x = 0; x < pw; x++ { if fill { img.Set(int(px*pw+x), int(py*ph+y), image.White) } else { img.Set(int(px*pw+x), int(py*ph+y), image.Transparent) } } } }