(bind-func print
(lambda (color:NVGcolor*)
(printf "<NVGcolor: r=%.3f, g=%.3f, b=%.3f, a=%.3f>"
(convert (tref color 0) double)
(convert (tref color 1) double)
(convert (tref color 2) double)
(convert (tref color 3) double))
void))