agg_pixfmt_rgba.h

来自「这是VCF框架的代码」· C头文件 代码 · 共 1,565 行 · 第 1/5 页

            long_type dg = p[Order::G];
            long_type db = p[Order::B];
            int       da = p[Order::A];
            long_type d2a = da >> 1;
            unsigned s2a = sa >> 1;

            int r = (int)((((dr - d2a) * int((sr - s2a)*2 + base_mask)) >> base_shift) + d2a); 
            int g = (int)((((dg - d2a) * int((sg - s2a)*2 + base_mask)) >> base_shift) + d2a); 
            int b = (int)((((db - d2a) * int((sb - s2a)*2 + base_mask)) >> base_shift) + d2a); 

            r = (r < 0) ? 0 : r;
            g = (g < 0) ? 0 : g;
            b = (b < 0) ? 0 : b;

            p[Order::R] = (value_type)((r > da) ? da : r);
            p[Order::G] = (value_type)((g > da) ? da : g);
            p[Order::B] = (value_type)((b > da) ? da : b);
        }
    };











    //======================================================comp_op_table_rgba
    template<class ColorT, class Order> struct comp_op_table_rgba
    {
        typedef typename ColorT::value_type value_type;
        typedef void (*comp_op_func_type)(value_type* p, 
                                          unsigned cr, 
                                          unsigned cg, 
                                          unsigned cb,
                                          unsigned ca,
                                          unsigned cover);
        static comp_op_func_type g_comp_op_func[];
    };

    //==========================================================g_comp_op_func
    template<class ColorT, class Order> 
    typename comp_op_table_rgba<ColorT, Order>::comp_op_func_type
    comp_op_table_rgba<ColorT, Order>::g_comp_op_func[] = 
    {
        comp_op_rgba_clear      <ColorT,Order>::blend_pix,
        comp_op_rgba_src        <ColorT,Order>::blend_pix,
        comp_op_rgba_dst        <ColorT,Order>::blend_pix,
        comp_op_rgba_src_over   <ColorT,Order>::blend_pix,
        comp_op_rgba_dst_over   <ColorT,Order>::blend_pix,
        comp_op_rgba_src_in     <ColorT,Order>::blend_pix,
        comp_op_rgba_dst_in     <ColorT,Order>::blend_pix,
        comp_op_rgba_src_out    <ColorT,Order>::blend_pix,
        comp_op_rgba_dst_out    <ColorT,Order>::blend_pix,
        comp_op_rgba_src_atop   <ColorT,Order>::blend_pix,
        comp_op_rgba_dst_atop   <ColorT,Order>::blend_pix,
        comp_op_rgba_xor        <ColorT,Order>::blend_pix,
        comp_op_rgba_plus       <ColorT,Order>::blend_pix,
        comp_op_rgba_minus      <ColorT,Order>::blend_pix,
        comp_op_rgba_multiply   <ColorT,Order>::blend_pix,
        comp_op_rgba_screen     <ColorT,Order>::blend_pix,
        comp_op_rgba_overlay    <ColorT,Order>::blend_pix,
        comp_op_rgba_darken     <ColorT,Order>::blend_pix,
        comp_op_rgba_lighten    <ColorT,Order>::blend_pix,
        comp_op_rgba_color_dodge<ColorT,Order>::blend_pix,
        comp_op_rgba_color_burn <ColorT,Order>::blend_pix,
        comp_op_rgba_hard_light <ColorT,Order>::blend_pix,
        comp_op_rgba_soft_light <ColorT,Order>::blend_pix,
        comp_op_rgba_difference <ColorT,Order>::blend_pix,
        comp_op_rgba_exclusion  <ColorT,Order>::blend_pix,
        comp_op_rgba_contrast   <ColorT,Order>::blend_pix,
        0
    };


    //==============================================================comp_op_e
    enum comp_op_e
    {
        comp_op_clear,         //----comp_op_clear
        comp_op_src,           //----comp_op_src
        comp_op_dst,           //----comp_op_dst
        comp_op_src_over,      //----comp_op_src_over
        comp_op_dst_over,      //----comp_op_dst_over
        comp_op_src_in,        //----comp_op_src_in
        comp_op_dst_in,        //----comp_op_dst_in
        comp_op_src_out,       //----comp_op_src_out
        comp_op_dst_out,       //----comp_op_dst_out
        comp_op_src_atop,      //----comp_op_src_atop
        comp_op_dst_atop,      //----comp_op_dst_atop
        comp_op_xor,           //----comp_op_xor
        comp_op_plus,          //----comp_op_plus
        comp_op_minus,         //----comp_op_minus
        comp_op_multiply,      //----comp_op_multiply
        comp_op_screen,        //----comp_op_screen
        comp_op_overlay,       //----comp_op_overlay
        comp_op_darken,        //----comp_op_darken
        comp_op_lighten,       //----comp_op_lighten
        comp_op_color_dodge,   //----comp_op_color_dodge
        comp_op_color_burn,    //----comp_op_color_burn
        comp_op_hard_light,    //----comp_op_hard_light
        comp_op_soft_light,    //----comp_op_soft_light
        comp_op_difference,    //----comp_op_difference
        comp_op_exclusion,     //----comp_op_exclusion
        comp_op_contrast,      //----comp_op_contrast

        end_of_comp_op_e
    };







    //====================================================comp_op_adaptor_rgba
    template<class ColorT, class Order> struct comp_op_adaptor_rgba
    {
        typedef Order  order_type;
        typedef ColorT color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            comp_op_table_rgba<ColorT, Order>::g_comp_op_func[op]
                (p, (cr * ca + base_mask) >> base_shift, 
                    (cg * ca + base_mask) >> base_shift,
                    (cb * ca + base_mask) >> base_shift,
                     ca, cover);
        }
    };

    //=========================================comp_op_adaptor_clip_to_dst_rgba
    template<class ColorT, class Order> struct comp_op_adaptor_clip_to_dst_rgba
    {
        typedef Order  order_type;
        typedef ColorT color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            cr = (cr * ca + base_mask) >> base_shift;
            cg = (cg * ca + base_mask) >> base_shift;
            cb = (cb * ca + base_mask) >> base_shift;
            unsigned da = p[Order::A];
            comp_op_table_rgba<ColorT, Order>::g_comp_op_func[op]
                (p, (cr * da + base_mask) >> base_shift, 
                    (cg * da + base_mask) >> base_shift, 
                    (cb * da + base_mask) >> base_shift, 
                    (ca * da + base_mask) >> base_shift, 
                    cover);
        }
    };

    //================================================comp_op_adaptor_rgba_pre
    template<class ColorT, class Order> struct comp_op_adaptor_rgba_pre
    {
        typedef Order  order_type;
        typedef ColorT color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            comp_op_table_rgba<ColorT, Order>::g_comp_op_func[op](p, cr, cg, cb, ca, cover);
        }
    };

    //=====================================comp_op_adaptor_clip_to_dst_rgba_pre
    template<class ColorT, class Order> struct comp_op_adaptor_clip_to_dst_rgba_pre
    {
        typedef Order  order_type;
        typedef ColorT color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            unsigned da = p[Order::A];
            comp_op_table_rgba<ColorT, Order>::g_comp_op_func[op]
                (p, (cr * da + base_mask) >> base_shift, 
                    (cg * da + base_mask) >> base_shift, 
                    (cb * da + base_mask) >> base_shift, 
                    (ca * da + base_mask) >> base_shift, 
                    cover);
        }
    };

    //=======================================================comp_adaptor_rgba
    template<class BlenderPre> struct comp_adaptor_rgba
    {
        typedef typename BlenderPre::order_type order_type;
        typedef typename BlenderPre::color_type color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            BlenderPre::blend_pix(p, 
                                  (cr * ca + base_mask) >> base_shift, 
                                  (cg * ca + base_mask) >> base_shift,
                                  (cb * ca + base_mask) >> base_shift,
                                  ca, cover);
        }
    };

    //==========================================comp_adaptor_clip_to_dst_rgba
    template<class BlenderPre> struct comp_adaptor_clip_to_dst_rgba
    {
        typedef typename BlenderPre::order_type order_type;
        typedef typename BlenderPre::color_type color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            cr = (cr * ca + base_mask) >> base_shift;
            cg = (cg * ca + base_mask) >> base_shift;
            cb = (cb * ca + base_mask) >> base_shift;
            unsigned da = p[order_type::A];
            BlenderPre::blend_pix(p, 
                                  (cr * da + base_mask) >> base_shift, 
                                  (cg * da + base_mask) >> base_shift, 
                                  (cb * da + base_mask) >> base_shift, 
                                  (ca * da + base_mask) >> base_shift, 
                                  cover);
        }
    };

    //======================================comp_adaptor_clip_to_dst_rgba_pre
    template<class BlenderPre> struct comp_adaptor_clip_to_dst_rgba_pre
    {
        typedef typename BlenderPre::order_type order_type;
        typedef typename BlenderPre::color_type color_type;
        typedef typename color_type::value_type value_type;
        enum base_scale_e
        {  
            base_shift = color_type::base_shift,
            base_mask  = color_type::base_mask 
        };

        static AGG_INLINE void blend_pix(unsigned op, value_type* p, 
                                         unsigned cr, unsigned cg, unsigned cb,
                                         unsigned ca,
                                         unsigned cover)
        {
            unsigned da = p[order_type::A];
            BlenderPre::blend_pix(p, 
                                  (cr * da + base_mask) >> base_shift, 
                                  (cg * da + base_mask) >> base_shift, 
                                  (cb * da + base_mask) >> base_shift, 
                                  (ca * da + base_mask) >> base_shift, 
                                  cover);
        }
    };






    //===============================================copy_or_blend_rgba_wrapper
    template<class Blender> struct copy_or_blend_rgba_wrapper
    {
        typedef typename Blender::color_type color_type;
        typedef typename Blender::order_type order_type;
        t