Function interp_png 

fn interp_png(
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Open a PNG graphics device.

@param filename output file path @param width width in pixels (default 480) @param height height in pixels (default 480) @return NULL (invisibly)