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color.h

00001 /*
00002   libwftk - Worldforge Toolkit - a widget library
00003   Copyright (C) 2002 Malcolm Walker <malcolm@worldforge.org>
00004   Based on code copyright  (C) 1999-2002  Karsten Laux
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
00018   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00019   Boston, MA  02111-1307, SA.
00020 */
00021 
00022 #ifndef _COLOR_H
00023 #define _COLOR_H
00024 
00025 #include <iosfwd>
00026 #include <SDL/SDL_version.h>
00027 #include <SDL/SDL_video.h>
00028 
00029 #include <wftk/resources.h>
00030 
00031 namespace wftk {
00034 class Color
00035 {
00036  public:
00040   enum {
00041     WFTK_TRANSPARENT = SDL_ALPHA_TRANSPARENT, 
00042     WFTK_OPAQUE = SDL_ALPHA_OPAQUE 
00043   };
00044 
00046   Color() : r(0), g(0), b(0), a(WFTK_OPAQUE) {}
00048   Color(Uint8 red, 
00049     Uint8 green,
00050     Uint8 blue,
00051     Uint8 alpha = WFTK_OPAQUE) : r(red), g(green), b(blue),a(alpha) {}
00053   Color(const SDL_Color& c) : r(c.r), g(c.g), b(c.b), a(WFTK_OPAQUE) {}
00055   Color(const std::string& name) {*this = Color::find(name);}
00057   Color(const char* name) {*this = Color::find(name);}
00059   static const Color& find(const std::string&);
00060   
00062   friend bool operator==(const Color &c1, const Color &c2)
00063   {
00064     return c1.r==c2.r && c1.g==c2.g && c1.b==c2.b;
00065   }
00067   friend bool operator!=(const Color &c1, const Color &c2)
00068   {
00069     return c1.r!=c2.r || c1.g!=c2.g || c1.b!=c2.b;
00070   }
00072   friend bool operator<(const Color& c1, const Color& c2)
00073   {
00074     return c1.r < c2.r || (c1.r == c2.r &&
00075           (c1.g < c2.g || (c1.g == c2.g && c1.b < c2.b)));
00076   }
00077 
00079   friend std::ostream& operator<<(std::ostream& s, const Color& c);
00080 
00081   struct ResLoad {
00082     std::pair<Color,bool> operator()(const std::string&);
00083   };
00084   struct ResInval {
00085     typedef const Color& OutType;
00086     OutType operator()(const std::string& resname) const {return Color::find(resname);}
00087   };
00102   static ResourceRegistry<Color,ResLoad,ResInval> registry;
00104   typedef Resource<Color> Resource;
00105 
00107   Uint8 r;
00109   Uint8 g;
00111   Uint8 b;
00113   Uint8 a;
00114 
00115 };
00116 
00117 }
00118 
00119 #endif // !_COLOR_H

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