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pixel.hpp

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00001 /*
00002   CLAW - a C++ Library Absolutely Wonderful
00003 
00004   CLAW is a free library without any particular aim but being useful to 
00005   anyone.
00006 
00007   Copyright (C) 2005-2008 Julien Jorge
00008 
00009   This library is free software; you can redistribute it and/or
00010   modify it under the terms of the GNU Lesser General Public
00011   License as published by the Free Software Foundation; either
00012   version 2.1 of the License, or (at your option) any later version.
00013 
00014   This library is distributed in the hope that it will be useful,
00015   but WITHOUT ANY WARRANTY; without even the implied warranty of
00016   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017   Lesser General Public License for more details.
00018 
00019   You should have received a copy of the GNU Lesser General Public
00020   License along with this library; if not, write to the Free Software
00021   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00022 
00023   contact: julien_jorge@yahoo.fr
00024 */
00030 #ifndef __CLAW_PIXEL_HPP_
00031 #define __CLAW_PIXEL_HPP_
00032 
00033 namespace claw
00034 {
00035   namespace graphic
00036   {
00037     union rgba_pixel;
00038 
00042     struct rgb_pixel
00043     {
00044       typedef unsigned char component_type;
00045 
00047       struct
00048       {
00050         component_type red;
00051 
00053         component_type green;
00054 
00056         component_type blue;
00057 
00058       } components; 
00059 
00060     public:
00061       rgb_pixel();
00062       rgb_pixel( component_type r, component_type g, component_type b );
00063       rgb_pixel( const rgba_pixel& p );
00064 
00065       bool operator==(const rgb_pixel& that) const;
00066       bool operator==(const rgba_pixel& that) const;
00067       bool operator!=(const rgb_pixel& that) const;
00068       bool operator!=(const rgba_pixel& that) const;
00069 
00070     }; // struct rgb_pixel
00071 
00075     union rgba_pixel
00076     {
00077       typedef unsigned char component_type;
00078 
00080       unsigned int pixel;
00081 
00083       struct
00084       {
00086         component_type red;
00087 
00089         component_type green;
00090 
00092         component_type blue;
00093 
00095         component_type alpha;
00096 
00097       } components; 
00098 
00099     public:
00100       rgba_pixel();
00101       rgba_pixel( component_type r, component_type g, component_type b,
00102                   component_type a );
00103 
00104       rgba_pixel& operator=( const rgb_pixel& that );
00105       bool operator==( const rgba_pixel& that ) const;
00106       bool operator!=( const rgba_pixel& that ) const;
00107 
00108       component_type luminosity() const;
00109 
00110     }; // struct rgba_pixel
00111 
00112     typedef rgb_pixel rgb_pixel_8;
00113     typedef rgba_pixel rgba_pixel_8;
00114 
00115     extern rgba_pixel black_pixel;
00116     extern rgba_pixel white_pixel;
00117 
00118     extern rgba_pixel blue_pixel;
00119     extern rgba_pixel green_pixel;
00120     extern rgba_pixel red_pixel;
00121 
00122     extern rgba_pixel yellow_pixel;
00123     extern rgba_pixel magenta_pixel;
00124     extern rgba_pixel cyan_pixel;
00125 
00126   } // namespace graphic
00127 } // namespace claw
00128 
00129 #endif // __CLAW_PIXEL_HPP__

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