agg_pixfmt_rgb.h

这是VCF框架的代码

                        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 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)
        {
            value_type* p;
            if(covers)
            {
                do 
                {
                    p = (value_type*)
                        m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                    copy_or_blend_pix(p, *colors++, *covers++);
                }
                while(--len);
            }
            else
            {
                if(cover == 255)
                {
                    do 
                    {
                        p = (value_type*)
                            m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                        copy_or_blend_pix(p, *colors++);
                    }
                    while(--len);
                }
                else
                {
                    do 
                    {
                        p = (value_type*)
                            m_rbuf->row_ptr(x, y++, 1) + x + x + x;

                        copy_or_blend_pix(p, *colors++, cover);
                    }
                    while(--len);
                }
            }
        }

        //--------------------------------------------------------------------
        template<class Function> void for_each_pixel(Function f)
        {
            unsigned y;
            for(y = 0; y < height(); ++y)
            {
                row_data r = m_rbuf->row(y);
                if(r.ptr)
                {
                    unsigned len = r.x2 - r.x1 + 1;
                    value_type* p = (value_type*)
                        m_rbuf->row_ptr(r.x1, y, len) + r.x1 * 3;
                    do
                    {
                        f(p);
                        p += 3;
                    }
                    while(--len);
                }
            }
        }

        //--------------------------------------------------------------------
        template<class GammaLut> void apply_gamma_dir(const GammaLut& g)
        {
            for_each_pixel(apply_gamma_dir_rgb<color_type, order_type, GammaLut>(g));
        }

        //--------------------------------------------------------------------
        template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
        {
            for_each_pixel(apply_gamma_inv_rgb<color_type, order_type, GammaLut>(g));
        }

        //--------------------------------------------------------------------
        template<class RenBuf2>
        void copy_from(const RenBuf2& from, 
                       int xdst, int ydst,
                       int xsrc, int ysrc,
                       unsigned len)
        {
            const int8u* p = from.row_ptr(ysrc);
            if(p)
            {
                memmove(m_rbuf->row_ptr(xdst, ydst, len) + xdst * pix_width, 
                        p + xsrc * pix_width, 
                        len * pix_width);
            }
        }


        //--------------------------------------------------------------------
        template<class SrcPixelFormatRenderer>
        void blend_from(const SrcPixelFormatRenderer& from, 
                        int xdst, int ydst,
                        int xsrc, int ysrc,
                        unsigned len,
                        int8u cover)
        {
            typedef typename SrcPixelFormatRenderer::order_type src_order;

            const value_type* psrc = (const value_type*)from.row_ptr(ysrc);
            if(psrc)
            {
                psrc += xsrc * 4;
                value_type* pdst = 
                    (value_type*)m_rbuf->row_ptr(xdst, ydst, len) + xdst * 3;   

                if(cover == 255)
                {
                    do 
                    {
                        value_type alpha = psrc[src_order::A];
                        if(alpha)
                        {
                            if(alpha == base_mask)
                            {
                                pdst[order_type::R] = psrc[src_order::R];
                                pdst[order_type::G] = psrc[src_order::G];
                                pdst[order_type::B] = psrc[src_order::B];
                            }
                            else
                            {
                                m_blender.blend_pix(pdst, 
                                                    psrc[src_order::R],
                                                    psrc[src_order::G],
                                                    psrc[src_order::B],
                                                    alpha);
                            }
                        }
                        psrc += 4;
                        pdst += 3;
                    }
                    while(--len);
                }
                else
                {
                    color_type color;
                    do 
                    {
                        color.r = psrc[src_order::R];
                        color.g = psrc[src_order::G];
                        color.b = psrc[src_order::B];
                        color.a = psrc[src_order::A];
                        copy_or_blend_pix(pdst, color, cover);
                        psrc += 4;
                        pdst += 3;
                    }
                    while(--len);
                }
            }
        }

    private:
        rbuf_type* m_rbuf;
        Blender    m_blender;
    };

    typedef pixfmt_alpha_blend_rgb<blender_rgb<rgba8,  order_rgb>, rendering_buffer> pixfmt_rgb24;    //----pixfmt_rgb24
    typedef pixfmt_alpha_blend_rgb<blender_rgb<rgba8,  order_bgr>, rendering_buffer> pixfmt_bgr24;    //----pixfmt_bgr24
    typedef pixfmt_alpha_blend_rgb<blender_rgb<rgba16, order_rgb>, rendering_buffer> pixfmt_rgb48;    //----pixfmt_rgb48
    typedef pixfmt_alpha_blend_rgb<blender_rgb<rgba16, order_bgr>, rendering_buffer> pixfmt_bgr48;    //----pixfmt_bgr48

    typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba8,  order_rgb>, rendering_buffer> pixfmt_rgb24_pre; //----pixfmt_rgb24_pre
    typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba8,  order_bgr>, rendering_buffer> pixfmt_bgr24_pre; //----pixfmt_bgr24_pre
    typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba16, order_rgb>, rendering_buffer> pixfmt_rgb48_pre; //----pixfmt_rgb48_pre
    typedef pixfmt_alpha_blend_rgb<blender_rgb_pre<rgba16, order_bgr>, rendering_buffer> pixfmt_bgr48_pre; //----pixfmt_bgr48_pre

    //-----------------------------------------------------pixfmt_rgb24_gamma
    template<class Gamma> class pixfmt_rgb24_gamma : 
    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_rgb, Gamma>, rendering_buffer>
    {
    public:
        pixfmt_rgb24_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_rgb, Gamma>, rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };
        
    //-----------------------------------------------------pixfmt_bgr24_gamma
    template<class Gamma> class pixfmt_bgr24_gamma : 
    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_bgr, Gamma>, rendering_buffer>
    {
    public:
        pixfmt_bgr24_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba8, order_bgr, Gamma>, rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };

    //-----------------------------------------------------pixfmt_rgb48_gamma
    template<class Gamma> class pixfmt_rgb48_gamma : 
    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_rgb, Gamma>, rendering_buffer>
    {
    public:
        pixfmt_rgb48_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_rgb, Gamma>, rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };
        
    //-----------------------------------------------------pixfmt_bgr48_gamma
    template<class Gamma> class pixfmt_bgr48_gamma : 
    public pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_bgr, Gamma>, rendering_buffer>
    {
    public:
        pixfmt_bgr48_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb<blender_rgb_gamma<rgba16, order_bgr, Gamma>, rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


}

#endif