agg_color_rgba.h.svn-base

okular

        }

        //--------------------------------------------------------------------
        const self_type& premultiply(unsigned a_)
        {
            if(a == base_mask && a_ >= base_mask) return *this;
            if(a == 0 || a_ == 0)
            {
                r = g = b = a = 0;
                return *this;
            }
            calc_type r_ = (calc_type(r) * a_) / a;
            calc_type g_ = (calc_type(g) * a_) / a;
            calc_type b_ = (calc_type(b) * a_) / a;
            r = value_type((r_ > a_) ? a_ : r_);
            g = value_type((g_ > a_) ? a_ : g_);
            b = value_type((b_ > a_) ? a_ : b_);
            a = value_type(a_);
            return *this;
        }

        //--------------------------------------------------------------------
        const self_type& demultiply()
        {
            if(a == base_mask) return *this;
            if(a == 0)
            {
                r = g = b = 0;
                return *this;
            }
            calc_type r_ = (calc_type(r) * base_mask) / a;
            calc_type g_ = (calc_type(g) * base_mask) / a;
            calc_type b_ = (calc_type(b) * base_mask) / a;
            r = value_type((r_ > base_mask) ? calc_type(base_mask) : r_);
            g = value_type((g_ > base_mask) ? calc_type(base_mask) : g_);
            b = value_type((b_ > base_mask) ? calc_type(base_mask) : b_);
            return *this;
        }

        //--------------------------------------------------------------------
        self_type gradient(const self_type& c, double k) const
        {
            self_type ret;
            calc_type ik = calc_type(k * base_size);
            ret.r = value_type(calc_type(r) + (((calc_type(c.r) - r) * ik) >> base_shift));
            ret.g = value_type(calc_type(g) + (((calc_type(c.g) - g) * ik) >> base_shift));
            ret.b = value_type(calc_type(b) + (((calc_type(c.b) - b) * ik) >> base_shift));
            ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift));
            return ret;
        }

        //--------------------------------------------------------------------
        static self_type no_color() { return self_type(0,0,0,0); }

        //--------------------------------------------------------------------
        static self_type from_wavelength(double wl, double gamma = 1.0)
        {
            return self_type(rgba::from_wavelength(wl, gamma));
        }
    };


    //-------------------------------------------------------------rgba8_pre
    inline rgba8 rgba8_pre(unsigned r, unsigned g, unsigned b, 
                           unsigned a = rgba8::base_mask)
    {
        return rgba8(r,g,b,a).premultiply();
    }
    inline rgba8 rgba8_pre(const rgba8& c)
    {
        return rgba8(c).premultiply();
    }
    inline rgba8 rgba8_pre(const rgba8& c, unsigned a)
    {
        return rgba8(c,a).premultiply();
    }
    inline rgba8 rgba8_pre(const rgba& c)
    {
        return rgba8(c).premultiply();
    }
    inline rgba8 rgba8_pre(const rgba& c, double a)
    {
        return rgba8(c,a).premultiply();
    }


    //-----------------------------------------------------------rgb8_packed
    inline rgba8 rgb8_packed(unsigned v)
    {
        return rgba8((v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF);
    }

    //-----------------------------------------------------------bgr8_packed
    inline rgba8 bgr8_packed(unsigned v)
    {
        return rgba8(v & 0xFF, (v >> 8) & 0xFF, (v >> 16) & 0xFF);
    }

    //----------------------------------------------------------argb8_packed
    inline rgba8 argb8_packed(unsigned v)
    {
        return rgba8((v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF, v >> 24);
    }








    //=================================================================rgba16
    struct rgba16
    {
        typedef int16u value_type;
        typedef int32u calc_type;
        typedef int64  long_type;
        enum
        {
            base_shift = 16,
            base_size  = 1 << base_shift,
            base_mask  = base_size - 1
        };
        typedef rgba16 self_type;

        value_type r;
        value_type g;
        value_type b;
        value_type a;

        //--------------------------------------------------------------------
        rgba16() {}

        //--------------------------------------------------------------------
        rgba16(unsigned r_, unsigned g_, unsigned b_, unsigned a_=base_mask) :
            r(value_type(r_)), 
            g(value_type(g_)), 
            b(value_type(b_)), 
            a(value_type(a_)) {}

        //--------------------------------------------------------------------
        rgba16(const self_type& c, unsigned a_) :
            r(c.r), g(c.g), b(c.b), a(value_type(a_)) {}

        //--------------------------------------------------------------------
        rgba16(const rgba& c) :
            r(value_type(c.r * double(base_mask) + 0.5)), 
            g(value_type(c.g * double(base_mask) + 0.5)), 
            b(value_type(c.b * double(base_mask) + 0.5)), 
            a(value_type(c.a * double(base_mask) + 0.5)) {}

        //--------------------------------------------------------------------
        rgba16(const rgba& c, double a_) :
            r(value_type(c.r * double(base_mask) + 0.5)), 
            g(value_type(c.g * double(base_mask) + 0.5)), 
            b(value_type(c.b * double(base_mask) + 0.5)), 
            a(value_type(a_  * double(base_mask) + 0.5)) {}

        //--------------------------------------------------------------------
        rgba16(const rgba8& c) :
            r(value_type((value_type(c.r) << 8) | c.r)), 
            g(value_type((value_type(c.g) << 8) | c.g)), 
            b(value_type((value_type(c.b) << 8) | c.b)), 
            a(value_type((value_type(c.a) << 8) | c.a)) {}

        //--------------------------------------------------------------------
        rgba16(const rgba8& c, unsigned a_) :
            r(value_type((value_type(c.r) << 8) | c.r)), 
            g(value_type((value_type(c.g) << 8) | c.g)), 
            b(value_type((value_type(c.b) << 8) | c.b)), 
            a(value_type((             a_ << 8) | c.a)) {}

        //--------------------------------------------------------------------
        void clear()
        {
            r = g = b = a = 0;
        }
        
        //--------------------------------------------------------------------
        const self_type& transparent()
        {
            a = 0;
            return *this;
        }

        //--------------------------------------------------------------------
        const self_type& opacity(double a_)
        {
            if(a_ < 0.0) a_ = 0.0;
            if(a_ > 1.0) a_ = 1.0;
            a = value_type(a_ * double(base_mask) + 0.5);
            return *this;
        }

        //--------------------------------------------------------------------
        double opacity() const
        {
            return double(a) / double(base_mask);
        }

        //--------------------------------------------------------------------
        const self_type& premultiply()
        {
            if(a == base_mask) return *this;
            if(a == 0)
            {
                r = g = b = 0;
                return *this;
            }
            r = value_type((calc_type(r) * a) >> base_shift);
            g = value_type((calc_type(g) * a) >> base_shift);
            b = value_type((calc_type(b) * a) >> base_shift);
            return *this;
        }

        //--------------------------------------------------------------------
        const self_type& premultiply(unsigned a_)
        {
            if(a == base_mask && a_ >= base_mask) return *this;
            if(a == 0 || a_ == 0)
            {
                r = g = b = a = 0;
                return *this;
            }
            calc_type r_ = (calc_type(r) * a_) / a;
            calc_type g_ = (calc_type(g) * a_) / a;
            calc_type b_ = (calc_type(b) * a_) / a;
            r = value_type((r_ > a_) ? a_ : r_);
            g = value_type((g_ > a_) ? a_ : g_);
            b = value_type((b_ > a_) ? a_ : b_);
            a = value_type(a_);
            return *this;
        }

        //--------------------------------------------------------------------
        const self_type& demultiply()
        {
            if(a == base_mask) return *this;
            if(a == 0)
            {
                r = g = b = 0;
                return *this;
            }
            calc_type r_ = (calc_type(r) * base_mask) / a;
            calc_type g_ = (calc_type(g) * base_mask) / a;
            calc_type b_ = (calc_type(b) * base_mask) / a;
            r = value_type((r_ > base_mask) ? calc_type(base_mask) : r_);
            g = value_type((g_ > base_mask) ? calc_type(base_mask) : g_);
            b = value_type((b_ > base_mask) ? calc_type(base_mask) : b_);
            return *this;
        }

        //--------------------------------------------------------------------
        self_type gradient(const self_type& c, double k) const
        {
            self_type ret;
            calc_type ik = calc_type(k * base_size);
            ret.r = value_type(calc_type(r) + (((calc_type(c.r) - r) * ik) >> base_shift));
            ret.g = value_type(calc_type(g) + (((calc_type(c.g) - g) * ik) >> base_shift));
            ret.b = value_type(calc_type(b) + (((calc_type(c.b) - b) * ik) >> base_shift));
            ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift));
            return ret;
        }

        //--------------------------------------------------------------------
        static self_type no_color() { return self_type(0,0,0,0); }

        //--------------------------------------------------------------------
        static self_type from_wavelength(double wl, double gamma = 1.0)
        {
            return self_type(rgba::from_wavelength(wl, gamma));
        }
    };



    //--------------------------------------------------------------rgba16_pre
    inline rgba16 rgba16_pre(unsigned r, unsigned g, unsigned b, 
                             unsigned a = rgba16::base_mask)
    {
        return rgba16(r,g,b,a).premultiply();
    }
    inline rgba16 rgba16_pre(const rgba16& c, unsigned a)
    {
        return rgba16(c,a).premultiply();
    }
    inline rgba16 rgba16_pre(const rgba& c)
    {
        return rgba16(c).premultiply();
    }
    inline rgba16 rgba16_pre(const rgba& c, double a)
    {
        return rgba16(c,a).premultiply();
    }
    inline rgba16 rgba16_pre(const rgba8& c)
    {
        return rgba16(c).premultiply();
    }
    inline rgba16 rgba16_pre(const rgba8& c, unsigned a)
    {
        return rgba16(c,a).premultiply();
    }

}



#endif