emb-g.rs

    fn draw_iter<T>(&mut self, pixels: T) -> Result<(), Self::Error> 
    where T: IntoIterator<Item = Pixel<Rgb888>> {
        let mut ptr = self.vram_base as *mut u32; 
        let mut iter = pixels.into_iter();
        let Pixel(coord, _color) = iter.next().unwrap();
        unsafe {
            if let Ok((x @ 0..=SCREEN_WIDTH, y @ 0..=SCREEN_HEIGHT)) = coord.try_into() {
                ptr = (self.vram_base as *mut u32)
                    .offset(x as isize) 
                    .offset((y * BUF_WIDTH) as isize);
            }
            for pixel in iter {
                let Pixel(_coord, color) = pixel;
                *ptr = (color.r() as u32)
                    | ((color.g() as u32) << 8)
                    | ((color.b() as u32) << 16);
                ptr = ptr.add(1);
            }
        }
        Ok(())
    }