Function librgbmatrix_sys::led_canvas_set_pixel

pub unsafe extern "C" fn led_canvas_set_pixel(
    canvas: *mut LedCanvas, 
    x: c_int, 
    y: c_int, 
    r: u8, 
    g: u8, 
    b: u8
)

Set pixel at (x, y) with color (r,g,b).