agg_pixfmt_rgb.h

windows ce 下的画各种b样条曲线

        {
            ((value_type*)p)[order_type::R] = c.r;
            ((value_type*)p)[order_type::G] = c.g;
            ((value_type*)p)[order_type::B] = c.b;
        }

        //--------------------------------------------------------------------
        AGG_INLINE color_type pixel(int x, int y) const
        {
            value_type* p = (value_type*)m_rbuf->row_ptr(y) + x + x + x;
            return color_type(p[order_type::R], 
                              p[order_type::G], 
                              p[order_type::B]);
        }

        //--------------------------------------------------------------------
        AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
        {
            value_type* p = (value_type*)m_rbuf->row_ptr(x, y, 1) + x + x + x;
            p[order_type::R] = c.r;
            p[order_type::G] = c.g;
            p[order_type::B] = c.b;
        }

        //--------------------------------------------------------------------
        AGG_INLINE void blend_pixel(int x, int y, const color_type& c, int8u cover)
        {
            copy_or_blend_pix((value_type*)m_rbuf->row_ptr(x, y, 1) + x + x + x, c, cover);
        }


        //--------------------------------------------------------------------
        AGG_INLINE void copy_hline(int x, int y, 
                                   unsigned len, 
                                   const color_type& c)
        {
            value_type* p = (value_type*)m_rbuf->row_ptr(x, y, len) + x + x + x;
            do
            {
                p[order_type::R] = c.r; 
                p[order_type::G] = c.g; 
                p[order_type::B] = c.b;
                p += 3;
            }
            while(--len);
        }


        //--------------------------------------------------------------------
        AGG_INLINE void copy_vline(int x, int y,
                                   unsigned len, 
                                   const color_type& c)
        {
            do
            {
                value_type* p = (value_type*)
                    m_rbuf->row_ptr(x, y++, 1) + x + x + x;
                p[order_type::R] = c.r; 
                p[order_type::G] = c.g; 
                p[order_type::B] = c.b;
            }
            while(--len);
        }


        //--------------------------------------------------------------------
        void blend_hline(int x, int y,
                         unsigned len, 
                         const color_type& c,
                         int8u cover)
        {
            if (c.a)
            {
                value_type* p = (value_type*)
                    m_rbuf->row_ptr(x, y, len) + x + x + x;

                calc_type alpha = (calc_type(c.a) * (calc_type(cover) + 1)) >> 8;
                if(alpha == base_mask)
                {
                    do
                    {
                        p[order_type::R] = c.r; 
                        p[order_type::G] = c.g; 
                        p[order_type::B] = c.b;
                        p += 3;
                    }
                    while(--len);
                }
                else
                {
                    do
                    {
                        m_blender.blend_pix(p, c.r, c.g, c.b, alpha, cover);
                        p += 3;
                    }
                    while(--len);
                }
            }
        }


        //--------------------------------------------------------------------
        void blend_vline(int x, int y,
                         unsigned len, 
                         const color_type& c,
                         int8u cover)
        {
            if (c.a)
            {
                value_type* p;
                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
                if(alpha == base_mask)
                {
                    do
                    {
                        p = (value_type*)
                            m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                        p[order_type::R] = c.r; 
                        p[order_type::G] = c.g; 
                        p[order_type::B] = c.b;
                    }
                    while(--len);
                }
                else
                {
                    do
                    {
                        p = (value_type*)
                            m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                        m_blender.blend_pix(p, c.r, c.g, c.b, alpha, cover);
                    }
                    while(--len);
                }
            }
        }


        //--------------------------------------------------------------------
        void blend_solid_hspan(int x, int y,
                               unsigned len, 
                               const color_type& c,
                               const int8u* covers)
        {
            if (c.a)
            {
                value_type* p = (value_type*)
                    m_rbuf->row_ptr(x, y, len) + x + x + x;

                do 
                {
                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
                    if(alpha == base_mask)
                    {
                        p[order_type::R] = c.r;
                        p[order_type::G] = c.g;
                        p[order_type::B] = c.b;
                    }
                    else
                    {
                        m_blender.blend_pix(p, c.r, c.g, c.b, alpha, *covers);
                    }
                    p += 3;
                    ++covers;
                }
                while(--len);
            }
        }


        //--------------------------------------------------------------------
        void blend_solid_vspan(int x, int y,
                               unsigned len, 
                               const color_type& c,
                               const int8u* covers)
        {
            if (c.a)
            {
                do 
                {
                    value_type* p = (value_type*)
                        m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
                    if(alpha == base_mask)
                    {
                        p[order_type::R] = c.r;
                        p[order_type::G] = c.g;
                        p[order_type::B] = c.b;
                    }
                    else
                    {
                        m_blender.blend_pix(p, c.r, c.g, c.b, alpha, *covers);
                    }
                    ++covers;
                }
                while(--len);
            }
        }


        //--------------------------------------------------------------------
        void copy_color_hspan(int x, int y,
                              unsigned len, 
                              const color_type* colors)
        {
            value_type* p = (value_type*)
                m_rbuf->row_ptr(x, y, len) + x + x + x;

            do 
            {
                p[order_type::R] = colors->r;
                p[order_type::G] = colors->g;
                p[order_type::B] = colors->b;
                ++colors;
                p += 3;
            }
            while(--len);
        }


        //--------------------------------------------------------------------
        void copy_color_vspan(int x, int y,
                              unsigned len, 
                              const color_type* colors)
        {
            do 
            {
                value_type* p = (value_type*)
                    m_rbuf->row_ptr(x, y++, 1) + x + x + x;
                p[order_type::R] = colors->r;
                p[order_type::G] = colors->g;
                p[order_type::B] = colors->b;
                ++colors;
            }
            while(--len);
        }


        //--------------------------------------------------------------------
        void blend_color_hspan(int x, int y,
                               unsigned len, 
                               const color_type* colors,
                               const int8u* covers,
                               int8u cover)
        {
            value_type* p = (value_type*)
                m_rbuf->row_ptr(x, y, len) + x + x + x;

            if(covers)
            {
                do 
                {
                    copy_or_blend_pix(p, *colors++, *covers++);
                    p += 3;
                }
                while(--len);
            }
            else
            {
                if(cover == 255)
                {
                    do 
                    {
                        copy_or_blend_pix(p, *colors++);
                        p += 3;
                    }
                    while(--len);
                }
                else
                {
                    do 
                    {
                        copy_or_blend_pix(p, *colors++, cover);
                        p += 3;
                    }
                    while(--len);
                }
            }
        }



        //--------------------------------------------------------------------
        void blend_color_vspan(int x, int y,
                               unsigned len, 
                               const color_type* colors,
                               const int8u* covers,
                               int8u cover)