Method build_lut

dep/agg/include/agg_gradient_lut.h:214–248

    //------------------------------------------------------------------------
    template <class T, unsigned S>
    void gradient_lut<T, S>::build_lut()
    {
        quick_sort(m_color_profile, offset_less);
        m_color_profile.cut_at(
            remove_duplicates(m_color_profile, offset_equal));
        if (m_color_profile.size() >= 2)
        {
            unsigned i;
            unsigned start = uround(m_color_profile[0].offset * color_lut_size);
            unsigned end;
            color_type c = m_color_profile[0].color;
            for (i = 0; i < start; i++)
            {
                m_color_lut[i] = c;
            }
            for (i = 1; i < m_color_profile.size(); i++)
            {
                end = uround(m_color_profile[i].offset * color_lut_size);
                interpolator_type ci(m_color_profile[i - 1].color,
                    m_color_profile[i].color,
                    end - start + 1);
                while (start < end)
                {
                    m_color_lut[start] = ci.color();
                    ++ci;
                    ++start;
                }
            }
            c = m_color_profile.last().color;
            for (; end < m_color_lut.size(); end++)
            {
                m_color_lut[end] = c;
            }
        }
    }
}

#endif