91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//$Id$
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#include "mapnik.hh"
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#include <iostream>
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#ifndef COLORCUBE_HH
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#define COLORCUBE_HH
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namespace mapnik
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{
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template <int rLevel,int gLevel,int bLevel>
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struct color_cube
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{
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const static unsigned maxcolors=rLevel * gLevel * bLevel + 32;
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static unsigned cube[maxcolors];
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static bool initialized;
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static unsigned rDiv;
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static unsigned gDiv;
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static unsigned bDiv;
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static unsigned color(unsigned red,unsigned green,unsigned blue)
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{
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if (!initialized)
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init();
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unsigned index=rgb_level_index(red/rDiv,green/gDiv,blue/bDiv);
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return cube[index];
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}
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private:
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static unsigned rgb_level_index(unsigned red,unsigned green,unsigned blue)
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{
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return (red * gLevel * bLevel + green * bLevel + blue);
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}
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static void init()
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{
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unsigned red,green,blue;
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unsigned count=0;
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for (int r=0;r<rLevel;++r)
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{
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for (int g=0;g<gLevel;++g)
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{
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for (int b=0;b<bLevel;++b)
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{
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red = std::min(255,r * (255 /(rLevel - 1)));
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green = std::min(255,g * (255 /(gLevel - 1)));
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blue = std::min(255,b * (255 /(bLevel - 1)));
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cube[rgb_level_index(r,g,b)]= (red) | (green<<8) | (blue<<16);
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//std::cout<<std::hex<<cube[rgb_level_index(r,g,b)]<<std::dec<<"\n";
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++count;
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}
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}
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}
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std::cout<<"number of colours="<<count<<"\n";
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}
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};
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//template<int rLevel,int gLevel,int bLevel>
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//unsigned color_cube<rLevel,gLevel,bLevel>::cube[color_cube<rLevel,gLevel, bLevel>::maxcolors];
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template<int rLevel,int gLevel,int bLevel>
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unsigned color_cube<rLevel,gLevel,bLevel>::rDiv=52;
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template<int rLevel,int gLevel,int bLevel>
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unsigned color_cube<rLevel,gLevel,bLevel>::gDiv=52;
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template<int rLevel,int gLevel,int bLevel>
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unsigned color_cube<rLevel,gLevel,bLevel>::bDiv=52;
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template<int rLevel,int gLevel,int bLevel>
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bool color_cube<rLevel,gLevel,bLevel>::initialized=false;
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}
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#endif
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