103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/color.hpp>
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#include <mapnik/color_factory.hpp>
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#include <mapnik/config_error.hpp>
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// agg
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#include "agg_color_rgba.h"
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// boost
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#include <boost/format.hpp>
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// stl
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#include <sstream>
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namespace mapnik {
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color::color(std::string const& str)
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{
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*this = parse_color(str);
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}
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std::string color::to_string() const
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{
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std::stringstream ss;
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if (alpha_ == 255)
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{
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ss << "rgb("
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<< static_cast<unsigned>(red()) << ","
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<< static_cast<unsigned>(green()) << ","
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<< static_cast<unsigned>(blue()) << ")";
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}
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else
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{
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ss << "rgba("
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<< static_cast<unsigned>(red()) << ","
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<< static_cast<unsigned>(green()) << ","
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<< static_cast<unsigned>(blue()) << ","
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<< alpha() / 255.0 << ")";
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}
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return ss.str();
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}
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std::string color::to_hex_string() const
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{
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if (alpha_ == 255 )
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{
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return (boost::format("#%1$02x%2$02x%3$02x")
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% static_cast<unsigned>(red())
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% static_cast<unsigned>(green())
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% static_cast<unsigned>(blue())).str();
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}
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else
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{
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return (boost::format("#%1$02x%2$02x%3$02x%4$02x")
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% static_cast<unsigned>(red())
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% static_cast<unsigned>(green())
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% static_cast<unsigned>(blue())
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% static_cast<unsigned>(alpha())).str();
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}
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}
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void color::premultiply()
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{
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agg::rgba8 pre_c = agg::rgba8(red_,green_,blue_,alpha_);
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pre_c.premultiply();
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red_ = pre_c.r;
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green_ = pre_c.g;
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blue_ = pre_c.b;
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}
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void color::demultiply()
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{
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// note: this darkens too much: https://github.com/mapnik/mapnik/issues/1519
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agg::rgba8 pre_c = agg::rgba8(red_,green_,blue_,alpha_);
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pre_c.demultiply();
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red_ = pre_c.r;
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green_ = pre_c.g;
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blue_ = pre_c.b;
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}
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}
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