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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/color.hpp>
#include <mapnik/color_factory.hpp>
#include <mapnik/config_error.hpp>
// agg
#include "agg_color_rgba.h"
// boost
#include <boost/format.hpp>
// stl
#include <sstream>
namespace mapnik {
color::color(std::string const& str)
{
*this = parse_color(str);
}
std::string color::to_string() const
{
std::stringstream ss;
if (alpha_ == 255)
{
ss << "rgb("
<< red() << ","
<< green() << ","
<< blue() << ")";
}
else
{
ss << "rgba("
<< red() << ","
<< green() << ","
<< blue() << ","
<< alpha()/255.0 << ")";
}
return ss.str();
}
std::string color::to_hex_string() const
{
if (alpha_ == 255 )
{
return (boost::format("#%1$02x%2$02x%3$02x")
% red()
% green()
% blue() ).str();
}
else
{
return (boost::format("#%1$02x%2$02x%3$02x%4$02x")
% red()
% green()
% blue()
% alpha()).str();
}
}
void color::premultiply()
{
agg::rgba8 pre_c = agg::rgba8(red_,green_,blue_,alpha_);
pre_c.premultiply();
red_ = pre_c.r;
green_ = pre_c.g;
blue_ = pre_c.b;
}
void color::demultiply()
{
// note: this darkens too much: https://github.com/mapnik/mapnik/issues/1519
agg::rgba8 pre_c = agg::rgba8(red_,green_,blue_,alpha_);
pre_c.demultiply();
red_ = pre_c.r;
green_ = pre_c.g;
blue_ = pre_c.b;
}
}
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