Cairo.NativeMethods.cairo_image_surface_create_from_png_stream C# (CSharp) Метод

        internal static extern IntPtr cairo_image_surface_create_from_png_stream([MarshalAs(UnmanagedType.FunctionPtr)]cairo_read_func_t read_func, IntPtr closure);

 private static IntPtr ConstructImageSurfaceFromPngData(byte[] pngData)
 {
     NativeMethods.cairo_read_func_t func = delegate(IntPtr closure, IntPtr out_data, int length)
     {
         Marshal.Copy(pngData, offset, out_data, length);
         offset += length;
         return(Status.Success);
     };
     return(NativeMethods.cairo_image_surface_create_from_png_stream(func, IntPtr.Zero));
 }