A small optimization to gradient_linear_color

I found something, there's a per-pixel divide that can be replaced with a precalculated multiply. I got a little performance boost out of it since I am doing tons of gradients. Here's my version of the class. Note that my sources are based on the second to last release (i.e. the non GPLed one):

    template<class ColorT>
    struct gradient_linear_color
    {
        typedef ColorT color_type;

        gradient_linear_color() {}
        gradient_linear_color(const color_type& c1, const color_type& c2,
                              unsigned size = 256) :
            m_c1(c1), m_c2(c2), m_size(size)
            // VFALCO 5/28/09
            ,m_mult(1/(double(size)-1))
            // VFALCO
            {}

        unsigned size() const { return m_size; }
        color_type operator [] (unsigned v) const
        {
            // VFALCO 5/28/09
            //return m_c1.gradient(m_c2, double(v) / double(m_size - 1));
            return m_c1.gradient(m_c2, double(v) * m_mult );
            // VFALCO
        }

        void colors(const color_type& c1, const color_type& c2, unsigned size = 256)
        {
            m_c1 = c1;
            m_c2 = c2;
            m_size = size;
            // VFALCO 5/28/09
            m_mult=1/(double(size)-1);
            // VFALCO
        }

        color_type m_c1;
        color_type m_c2;
        unsigned m_size;
        // VFALCO 5/28/09
        double m_mult;
        // VFALCO
    };



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