agg_pixfmt_rgb_packed.h

这是VCF框架的代码

            if (c.a)
            {
                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
                if(alpha == base_mask)
                {
                    *p = m_blender.make_pix(c.r, c.g, c.b);
                }
                else
                {
                    m_blender.blend_pix(p, c.r, c.g, c.b, alpha, cover);
                }
            }
        }

    public:
        //--------------------------------------------------------------------
        pixfmt_alpha_blend_rgb_packed(rbuf_type& rb) : m_rbuf(&rb) {}
        void attach(rbuf_type& rb) { m_rbuf = &rb; }
        Blender& blender() { return m_blender; }

        //--------------------------------------------------------------------
        AGG_INLINE unsigned width()  const { return m_rbuf->width();  }
        AGG_INLINE unsigned height() const { return m_rbuf->height(); }

        //--------------------------------------------------------------------
        const int8u* row_ptr(int y) const
        {
            return m_rbuf->row_ptr(y);
        }

        //--------------------------------------------------------------------
        const int8u* pix_ptr(int x, int y) const
        {
            return m_rbuf->row_ptr(y) + x * pix_width;
        }

        //--------------------------------------------------------------------
        row_data row(int x, int y) const
        {
            return m_rbuf->row(y);
        }

        //--------------------------------------------------------------------
        AGG_INLINE void make_pix(int8u* p, const color_type& c)
        {
            *(pixel_type*)p = m_blender.make_pix(c.r, c.g, c.b);
        }

        //--------------------------------------------------------------------
        AGG_INLINE color_type pixel(int x, int y) const
        {
            return m_blender.make_color(((pixel_type*)m_rbuf->row_ptr(y))[x]);
        }

        //--------------------------------------------------------------------
        AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
        {
            ((pixel_type*)
                m_rbuf->row_ptr(x, y, 1))[x] = 
                    m_blender.make_pix(c.r, c.g, c.b);
        }

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

        //--------------------------------------------------------------------
        AGG_INLINE void copy_hline(int x, int y, 
                                   unsigned len, 
                                   const color_type& c)
        {
            pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y, len) + x;
            pixel_type v = m_blender.make_pix(c.r, c.g, c.b);
            do
            {
                *p++ = v;
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        AGG_INLINE void copy_vline(int x, int y,
                                   unsigned len, 
                                   const color_type& c)
        {
            pixel_type v = m_blender.make_pix(c.r, c.g, c.b);
            do
            {
                pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y++, 1) + x;
                *p = v;
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        void blend_hline(int x, int y,
                         unsigned len, 
                         const color_type& c,
                         int8u cover)
        {
            if (c.a)
            {
                pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y, len) + x;
                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
                if(alpha == base_mask)
                {
                    pixel_type v = m_blender.make_pix(c.r, c.g, c.b);
                    do
                    {
                        *p++ = v;
                    }
                    while(--len);
                }
                else
                {
                    do
                    {
                        m_blender.blend_pix(p, c.r, c.g, c.b, alpha, cover);
                        ++p;
                    }
                    while(--len);
                }
            }
        }

        //--------------------------------------------------------------------
        void blend_vline(int x, int y,
                         unsigned len, 
                         const color_type& c,
                         int8u cover)
        {
            if (c.a)
            {
                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
                if(alpha == base_mask)
                {
                    pixel_type v = m_blender.make_pix(c.r, c.g, c.b);
                    do
                    {
                        ((pixel_type*)m_rbuf->row_ptr(x, y++, 1))[x] = v;
                    }
                    while(--len);
                }
                else
                {
                    do
                    {
                        m_blender.blend_pix(
                            (pixel_type*)m_rbuf->row_ptr(x, y++, 1), 
                            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)
        {
            pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y, len) + x;
            do 
            {
                copy_or_blend_pix(p, c, *covers++);
                ++p;
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        void blend_solid_vspan(int x, int y,
                               unsigned len, 
                               const color_type& c,
                               const int8u* covers)
        {
            do 
            {
                copy_or_blend_pix((pixel_type*)m_rbuf->row_ptr(x, y++, 1) + x, 
                                  c, *covers++);
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        void copy_color_hspan(int x, int y,
                              unsigned len, 
                              const color_type* colors)
        {
            pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y, len) + x;
            do 
            {
                *p++ = m_blender.make_pix(colors->r, colors->g, colors->b);
                ++colors;
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        void blend_color_hspan(int x, int y,
                               unsigned len, 
                               const color_type* colors,
                               const int8u* covers,
                               int8u cover)
        {
            pixel_type* p = (pixel_type*)m_rbuf->row_ptr(x, y, len) + x;
            do 
            {
                copy_or_blend_pix(p++, *colors++, covers ? *covers++ : cover);
            }
            while(--len);
        }

        //--------------------------------------------------------------------
        void blend_color_vspan(int x, int y,
                               unsigned len, 
                               const color_type* colors,
                               const int8u* covers,
                               int8u cover)
        {
            do 
            {
                copy_or_blend_pix((pixel_type*)m_rbuf->row_ptr(x, y++, 1) + x, 
                                  *colors++, covers ? *covers++ : cover);
            }
            while(--len);
        }
        
        //--------------------------------------------------------------------
        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;
                pixel_type* pdst = 
                    (pixel_type*)m_rbuf->row_ptr(xdst, ydst, len) + xdst;
                do 
                {
                    value_type alpha = psrc[src_order::A];
                    if(alpha)
                    {
                        if(alpha == base_mask && cover == 255)
                        {
                            *pdst = m_blender.make_pix(psrc[src_order::R], 
                                                       psrc[src_order::G],
                                                       psrc[src_order::B]);
                        }
                        else
                        {
                            m_blender.blend_pix(pdst, 
                                                psrc[src_order::R],
                                                psrc[src_order::G],
                                                psrc[src_order::B],
                                                alpha,
                                                cover);
                        }
                    }
                    psrc += 4;
                    ++pdst;
                }
                while(--len);
            }
        }

    private:
        rbuf_type* m_rbuf;
        Blender    m_blender;
    };

    typedef pixfmt_alpha_blend_rgb_packed<blender_rgb555, rendering_buffer> pixfmt_rgb555; //----pixfmt_rgb555
    typedef pixfmt_alpha_blend_rgb_packed<blender_rgb565, rendering_buffer> pixfmt_rgb565; //----pixfmt_rgb565

    typedef pixfmt_alpha_blend_rgb_packed<blender_rgb555_pre, rendering_buffer> pixfmt_rgb555_pre; //----pixfmt_rgb555_pre
    typedef pixfmt_alpha_blend_rgb_packed<blender_rgb565_pre, rendering_buffer> pixfmt_rgb565_pre; //----pixfmt_rgb565_pre

    typedef pixfmt_alpha_blend_rgb_packed<blender_rgbAAA, rendering_buffer> pixfmt_rgbAAA; //----pixfmt_rgbAAA
    typedef pixfmt_alpha_blend_rgb_packed<blender_bgrAAA, rendering_buffer> pixfmt_bgrAAA; //----pixfmt_bgrAAA
    typedef pixfmt_alpha_blend_rgb_packed<blender_rgbBBA, rendering_buffer> pixfmt_rgbBBA; //----pixfmt_rgbBBA
    typedef pixfmt_alpha_blend_rgb_packed<blender_bgrABB, rendering_buffer> pixfmt_bgrABB; //----pixfmt_bgrABB

    typedef pixfmt_alpha_blend_rgb_packed<blender_rgbAAA_pre, rendering_buffer> pixfmt_rgbAAA_pre; //----pixfmt_rgbAAA_pre
    typedef pixfmt_alpha_blend_rgb_packed<blender_bgrAAA_pre, rendering_buffer> pixfmt_bgrAAA_pre; //----pixfmt_bgrAAA_pre
    typedef pixfmt_alpha_blend_rgb_packed<blender_rgbBBA_pre, rendering_buffer> pixfmt_rgbBBA_pre; //----pixfmt_rgbBBA_pre
    typedef pixfmt_alpha_blend_rgb_packed<blender_bgrABB_pre, rendering_buffer> pixfmt_bgrABB_pre; //----pixfmt_bgrABB_pre


    //-----------------------------------------------------pixfmt_rgb555_gamma
    template<class Gamma> class pixfmt_rgb555_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_rgb555_gamma<Gamma>, 
                                         rendering_buffer>
    {
    public:
        pixfmt_rgb555_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_rgb555_gamma<Gamma>, 
                                          rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


    //-----------------------------------------------------pixfmt_rgb565_gamma
    template<class Gamma> class pixfmt_rgb565_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_rgb565_gamma<Gamma>, rendering_buffer>
    {
    public:
        pixfmt_rgb565_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_rgb565_gamma<Gamma>, rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


    //-----------------------------------------------------pixfmt_rgbAAA_gamma
    template<class Gamma> class pixfmt_rgbAAA_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_rgbAAA_gamma<Gamma>, 
                                         rendering_buffer>
    {
    public:
        pixfmt_rgbAAA_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_rgbAAA_gamma<Gamma>, 
                                          rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


    //-----------------------------------------------------pixfmt_bgrAAA_gamma
    template<class Gamma> class pixfmt_bgrAAA_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_bgrAAA_gamma<Gamma>, 
                                         rendering_buffer>
    {
    public:
        pixfmt_bgrAAA_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_bgrAAA_gamma<Gamma>, 
                                          rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


    //-----------------------------------------------------pixfmt_rgbBBA_gamma
    template<class Gamma> class pixfmt_rgbBBA_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_rgbBBA_gamma<Gamma>, 
                                         rendering_buffer>
    {
    public:
        pixfmt_rgbBBA_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_rgbBBA_gamma<Gamma>, 
                                          rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


    //-----------------------------------------------------pixfmt_bgrABB_gamma
    template<class Gamma> class pixfmt_bgrABB_gamma : 
    public pixfmt_alpha_blend_rgb_packed<blender_bgrABB_gamma<Gamma>, 
                                         rendering_buffer>
    {
    public:
        pixfmt_bgrABB_gamma(rendering_buffer& rb, const Gamma& g) :
            pixfmt_alpha_blend_rgb_packed<blender_bgrABB_gamma<Gamma>, 
                                          rendering_buffer>(rb) 
        {
            this->blender().gamma(g);
        }
    };


}

#endif