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64 lines
2.1 KiB
C++
64 lines
2.1 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) 2024 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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#ifndef MAPNIK_AGG_PATTERN_SOURCE_HPP
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#define MAPNIK_AGG_PATTERN_SOURCE_HPP
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// mapnik
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#include <mapnik/image.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore_agg.hpp>
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#include "agg_color_rgba.h"
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MAPNIK_DISABLE_WARNING_POP
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namespace mapnik {
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class pattern_source : private util::noncopyable
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{
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public:
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pattern_source(image_rgba8 const& pattern, double opacity = 1.0)
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: pattern_(pattern)
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, opacity_(opacity)
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{}
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unsigned int width() const { return pattern_.width(); }
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unsigned int height() const { return pattern_.height(); }
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agg::rgba8 pixel(int x, int y) const
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{
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unsigned c = pattern_(x, y);
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return agg::rgba8(static_cast<unsigned>((c & 0xff) * opacity_),
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static_cast<unsigned>(((c >> 8) & 0xff) * opacity_),
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static_cast<unsigned>(((c >> 16) & 0xff) * opacity_),
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static_cast<unsigned>(((c >> 24) & 0xff) * opacity_));
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}
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private:
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image_rgba8 const& pattern_;
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double opacity_;
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};
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} // namespace mapnik
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#endif // MAPNIK_AGG_PATTERN_SOURCE_HPP
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