Cairo.NativeMethods.cairo_set_source_rgba C# (CSharp) Метод

        internal static extern void cairo_set_source_rgba(IntPtr cr, double red, double green, double blue, double alpha);

 public void SetSourceRGBA(double r, double g, double b, double a)
 {
     NativeMethods.cairo_set_source_rgba(state, r, g, b, a);
 }