84 lines
2.8 KiB
C++
84 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) 2012 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_MINIZ_PNG_HPP
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#define MAPNIK_MINIZ_PNG_HPP
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// mapnik
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#include <mapnik/palette.hpp>
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// stl
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#include <vector>
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#include <iostream>
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#include <stdexcept>
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/* miniz.c porting issues:
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- duplicate symbols in python bindings require moving miniz.c include to just cpp file
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- due to http://code.google.com/p/miniz/issues/detail?id=7
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- avoiding including miniz.c here requires fwd declaring the two structs below
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- being able to fwd declare requires removing typedef from struct declarations in miniz.c
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- being able to fwd declare also requires using pointers to structs
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- if updated, need to apply c++11 fix: https://github.com/mapnik/mapnik/issues/1967
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*/
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// TODO: try using #define MINIZ_HEADER_FILE_ONLY
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struct tdefl_output_buffer;
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struct tdefl_compressor;
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namespace mapnik { namespace MiniZ {
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using mapnik::rgb;
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class PNGWriter {
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public:
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PNGWriter(int level, int strategy);
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~PNGWriter();
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private:
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inline void writeUInt32BE(unsigned char *target, unsigned int value);
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size_t startChunk(const unsigned char header[], size_t length);
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void finishChunk(size_t start);
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public:
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void writeIHDR(unsigned int width, unsigned int height, unsigned char pixel_depth);
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void writePLTE(std::vector<rgb> const& palette);
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void writetRNS(std::vector<unsigned> const& alpha);
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template<typename T>
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void writeIDAT(T const& image);
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template<typename T>
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void writeIDATStripAlpha(T const& image);
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void writeIEND();
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void toStream(std::ostream& stream);
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private:
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tdefl_compressor *compressor;
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tdefl_output_buffer *buffer;
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static const unsigned char preamble[];
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static const unsigned char IHDR_tpl[];
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static const unsigned char PLTE_tpl[];
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static const unsigned char tRNS_tpl[];
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static const unsigned char IDAT_tpl[];
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static const unsigned char IEND_tpl[];
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};
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}}
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#endif // MAPNIK_MINIZ_PNG_HPP
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