libs/agg/agg_color_rgba.h

55         rgba(double r_, double g_, double b_, double a_=1.0) :
56             r(r_), g(g_), b(b_), a(a_) {}
59         rgba(const rgba& c, double a_) : r(c.r), g(c.g), b(c.b), a(a_) {}
75         const rgba& opacity(double a_)
77             if(a_ < 0.0) a_ = 0.0;
78             if(a_ > 1.0) a_ = 1.0;
79             a = a_;
99         const rgba& premultiply(double a_)
101             if(a <= 0.0 || a_ <= 0.0)
106             a_ /= a;
107             r *= a_;
108             g *= a_;
109             b *= a_;
110             a  = a_;
122             double a_ = 1.0 / a;
123             r *= a_;
124             g *= a_;
125             b *= a_;
246         rgba8(unsigned r_, unsigned g_, unsigned b_, unsigned a_=base_mask) :
250             a(value_type(a_)) {}
253         rgba8(const rgba& c, double a_) :
257             a((value_type)uround(a_  * double(base_mask))) {}
260         rgba8(const self_type& c, unsigned a_) :
261             r(c.r), g(c.g), b(c.b), a(value_type(a_)) {}
284         const self_type& opacity(double a_)
286             if(a_ < 0.0) a_ = 0.0;
287             if(a_ > 1.0) a_ = 1.0;
288             a = (value_type)uround(a_ * double(base_mask));
314         AGG_INLINE const self_type& premultiply(unsigned a_)
316             if(a == base_mask && a_ >= base_mask) return *this;
317             if(a == 0 || a_ == 0)
322             calc_type r_ = (calc_type(r) * a_) / a;
323             calc_type g_ = (calc_type(g) * a_) / a;
324             calc_type b_ = (calc_type(b) * a_) / a;
325             r = value_type((r_ > a_) ? a_ : r_);
326             g = value_type((g_ > a_) ? a_ : g_);
327             b = value_type((b_ > a_) ? a_ : b_);
328             a = value_type(a_);
494         rgba16(unsigned r_, unsigned g_, unsigned b_, unsigned a_=base_mask) :
498             a(value_type(a_)) {}
501         rgba16(const self_type& c, unsigned a_) :
502             r(c.r), g(c.g), b(c.b), a(value_type(a_)) {}
512         rgba16(const rgba& c, double a_) :
516             a((value_type)uround(a_  * double(base_mask))) {}
526         rgba16(const rgba8& c, unsigned a_) :
530             a(value_type((             a_ << 8) | c.a)) {}
546         AGG_INLINE const self_type& opacity(double a_)
548             if(a_ < 0.0) a_ = 0.0;
549             if(a_ > 1.0) a_ = 1.0;
550             a = (value_type)uround(a_ * double(base_mask));
576         AGG_INLINE const self_type& premultiply(unsigned a_)
578             if(a == base_mask && a_ >= base_mask) return *this;
579             if(a == 0 || a_ == 0)
584             calc_type r_ = (calc_type(r) * a_) / a;
585             calc_type g_ = (calc_type(g) * a_) / a;
586             calc_type b_ = (calc_type(b) * a_) / a;
587             r = value_type((r_ > a_) ? a_ : r_);
588             g = value_type((g_ > a_) ? a_ : g_);
589             b = value_type((b_ > a_) ? a_ : b_);
590             a = value_type(a_);