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 $cr->set_source_rgb (0, 0, 0);

$cr->set_source_rgb ($red, $green, $blue)
           $red: double
           $green: double
           $blue: double

 $cr->set_source_rgba ($red, $green, $blue, $alpha)
           $red: double
           $green: double
           $blue: double
           $alpha: double