agg_pixfmt_gray.h

来自「这是VCF框架的代码」· C头文件 代码 · 共 586 行 · 第 1/2 页

        }


        //--------------------------------------------------------------------
        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 * Step + Offset;

                        *p = c.v; 
                    }
                    while(--len);
                }
                else
                {
                    do
                    {
                        p = (value_type*)
                            m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;

                        Blender::blend_pix(p, c.v, 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 * Step + Offset;

                do 
                {
                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
                    if(alpha == base_mask)
                    {
                        *p = c.v;
                    }
                    else
                    {
                        Blender::blend_pix(p, c.v, alpha, *covers);
                    }
                    p += Step;
                    ++covers;
                }
                while(--len);
            }
        }


        //--------------------------------------------------------------------
        void blend_solid_vspan(int x, int y,
                               unsigned len, 
                               const color_type& c,
                               const int8u* covers)
        {
            if (c.a)
            {
                do 
                {
                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;

                    value_type* p = (value_type*)
                        m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;

                    if(alpha == base_mask)
                    {
                        *p = c.v;
                    }
                    else
                    {
                        Blender::blend_pix(p, c.v, 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 * Step + Offset;

            do 
            {
                *p++ = colors->v;
                ++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 * Step + Offset;

            if(covers)
            {
                do 
                {
                    copy_or_blend_pix(p, *colors++, *covers++);
                    p += Step;
                }
                while(--len);
            }
            else
            {
                if(cover == 255)
                {
                    do 
                    {
                        if(colors->a == base_mask)
                        {
                            *p = colors->v;
                        }
                        else
                        {
                            copy_or_blend_pix(p, *colors);
                        }
                        p += Step;
                        ++colors;
                    }
                    while(--len);
                }
                else
                {
                    do 
                    {
                        copy_or_blend_pix(p, *colors++, cover);
                        p += Step;
                    }
                    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 * Step + Offset;

                    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 * Step + Offset;

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

                        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 * Step + Offset;

                    do
                    {
                        f(p);
                        p += Step;
                    }
                    while(--len);
                }
            }
        }

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

        //--------------------------------------------------------------------
        template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
        {
            for_each_pixel(apply_gamma_inv_gray<color_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);
            }
        }

    private:
        rbuf_type* m_rbuf;
    };

    typedef blender_gray<gray8>      blender_gray8;
    typedef blender_gray_pre<gray8>  blender_gray8_pre;
    typedef blender_gray<gray16>     blender_gray16;
    typedef blender_gray_pre<gray16> blender_gray16_pre;

    typedef pixfmt_alpha_blend_gray<blender_gray8,      rendering_buffer> pixfmt_gray8;      //----pixfmt_gray8
    typedef pixfmt_alpha_blend_gray<blender_gray8_pre,  rendering_buffer> pixfmt_gray8_pre;  //----pixfmt_gray8_pre
    typedef pixfmt_alpha_blend_gray<blender_gray16,     rendering_buffer> pixfmt_gray16;     //----pixfmt_gray16
    typedef pixfmt_alpha_blend_gray<blender_gray16_pre, rendering_buffer> pixfmt_gray16_pre; //----pixfmt_gray16_pre
}

#endif