CVD 0.8
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00001 /* 00002 This file is part of the CVD Library. 00003 00004 Copyright (C) 2005 The Authors 00005 00006 This library is free software; you can redistribute it and/or 00007 modify it under the terms of the GNU Lesser General Public 00008 License as published by the Free Software Foundation; either 00009 version 2.1 of the License, or (at your option) any later version. 00010 00011 This library is distributed in the hope that it will be useful, 00012 but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 Lesser General Public License for more details. 00015 00016 You should have received a copy of the GNU Lesser General Public 00017 License along with this library; if not, write to the Free Software 00018 Foundation, Inc., 00019 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 #ifndef CVD_RGBA_H 00022 #define CVD_RGBA_H 00023 00024 #include <iostream> 00025 #include <cvd/internal/is_pod.h> 00026 00027 namespace CVD { 00028 00029 00031 // CVD::Rgba 00032 // Template class to represent red, green, blue and alpha components 00033 // 00037 template <typename T> 00038 class Rgba 00039 { 00040 public: 00042 explicit Rgba() : red(0), green(0), blue(0), alpha(0) {} 00043 00049 inline explicit Rgba(T r, T g, T b, T a) : red(r), green(g), blue(b), alpha(a) {} 00050 template <class S> inline explicit Rgba(const Rgba<S>& rgba) : red(static_cast<T>(rgba.red)), green(static_cast<T>(rgba.green)), blue(static_cast<T>(rgba.blue)), alpha(static_cast<T>(rgba.alpha)) {} 00051 00052 T red; 00053 T green; 00054 T blue; 00055 T alpha; 00056 00059 template <typename T2> 00060 Rgba<T>& operator=(const Rgba<T2>& c){ 00061 red = static_cast<T>(c.red); 00062 green = static_cast<T>(c.green); 00063 blue = static_cast<T>(c.blue); 00064 alpha = static_cast<T>(c.alpha); 00065 return *this; 00066 } 00067 00070 bool operator==(const Rgba<T>& c) const 00071 {return red == c.red && green == c.green && blue == c.blue && alpha == c.alpha;} 00072 00075 bool operator!=(const Rgba<T>& c) const 00076 {return red != c.red || green != c.green || blue != c.blue || alpha != c.alpha;} 00077 00078 // T to_grey() const {return 0.3*red + 0.6*green + 0.1*blue;} 00079 }; 00080 00085 template <typename T> 00086 std::ostream& operator <<(std::ostream& os, const Rgba<T>& x) 00087 { 00088 return os << "(" << x.red << "," << x.green << "," 00089 << x.blue << "," << x.alpha << ")"; 00090 } 00091 00096 inline std::ostream& operator <<(std::ostream& os, const Rgba<unsigned char>& x) 00097 { 00098 return os << "(" << static_cast<unsigned int>(x.red) << "," 00099 << static_cast<unsigned int>(x.green) << "," 00100 << static_cast<unsigned int>(x.blue) << "," 00101 << static_cast<unsigned int>(x.alpha) << ")"; 00102 } 00103 00104 #ifndef DOXYGEN_IGNORE_INTERNAL 00105 namespace Internal 00106 { 00107 template<class C> struct is_POD<Rgba<C> > 00108 { 00109 enum { is_pod = is_POD<C>::is_pod }; 00110 }; 00111 } 00112 #endif 00113 00114 00115 00116 } // end namespace 00117 #endif 00118