143 lines
5.3 KiB
C++
143 lines
5.3 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) 2015 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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#if defined(HAVE_JPEG)
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#include <mapnik/jpeg_io.hpp>
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#endif
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#include <mapnik/image_util.hpp>
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#include <mapnik/image_util_jpeg.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/image_view.hpp>
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#include <mapnik/image_options.hpp>
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#include <mapnik/util/conversions.hpp>
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// stl
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#include <string>
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namespace mapnik
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{
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jpeg_saver::jpeg_saver(std::ostream & stream, std::string const& t)
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: stream_(stream), t_(t) {}
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namespace detail {
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int parse_jpeg_quality(std::string const& params)
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{
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int quality = 85;
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if (params != "jpeg")
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{
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for (auto const& kv : parse_image_options(params))
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{
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auto const& key = kv.first;
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auto const& val = kv.second;
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if ( key == "jpeg" ) continue;
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else if ( key.size() > 4 && key.substr(0,4) == "jpeg")
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{
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if (!mapnik::util::string2int(key.substr(4), quality))
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{
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throw image_writer_exception("invalid jpeg quality: '" + key.substr(4) + "'");
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}
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}
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else if ( key == "quality")
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{
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if (val && ! (*val).empty())
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{
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if (!mapnik::util::string2int(*val, quality) || quality < 0 || quality > 100)
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{
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throw image_writer_exception("invalid jpeg quality: '" + *val + "'");
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}
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}
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}
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}
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}
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return quality;
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}
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}
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template <typename T>
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void process_rgba8_jpeg(T const& image, std::string const& type, std::ostream & stream)
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{
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#if defined(HAVE_JPEG)
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int quality = detail::parse_jpeg_quality(type);
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save_as_jpeg(stream, quality, image);
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#else
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throw image_writer_exception("jpeg output is not enabled in your build of Mapnik");
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#endif
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}
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template<>
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void jpeg_saver::operator()<image_rgba8> (image_rgba8 const& image) const
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{
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process_rgba8_jpeg(image, t_, stream_);
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}
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template<>
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void jpeg_saver::operator()<image_view_rgba8> (image_view_rgba8 const& image) const
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{
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process_rgba8_jpeg(image, t_, stream_);
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}
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template<>
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void jpeg_saver::operator()<image_null> (image_null const& image) const
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{
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throw image_writer_exception("Can not save a null image to jpeg");
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}
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template<>
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void jpeg_saver::operator()<image_view_null> (image_view_null const& image) const
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{
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throw image_writer_exception("Can not save a null image to jpeg");
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}
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template <typename T>
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void jpeg_saver::operator() (T const& image) const
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{
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throw image_writer_exception("Mapnik does not support jpeg grayscale images");
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}
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template void jpeg_saver::operator()<image_gray8> (image_gray8 const& image) const;
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template void jpeg_saver::operator()<image_gray8s> (image_gray8s const& image) const;
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template void jpeg_saver::operator()<image_gray16> (image_gray16 const& image) const;
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template void jpeg_saver::operator()<image_gray16s> (image_gray16s const& image) const;
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template void jpeg_saver::operator()<image_gray32> (image_gray32 const& image) const;
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template void jpeg_saver::operator()<image_gray32s> (image_gray32s const& image) const;
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template void jpeg_saver::operator()<image_gray32f> (image_gray32f const& image) const;
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template void jpeg_saver::operator()<image_gray64> (image_gray64 const& image) const;
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template void jpeg_saver::operator()<image_gray64s> (image_gray64s const& image) const;
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template void jpeg_saver::operator()<image_gray64f> (image_gray64f const& image) const;
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template void jpeg_saver::operator()<image_view_gray8> (image_view_gray8 const& image) const;
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template void jpeg_saver::operator()<image_view_gray8s> (image_view_gray8s const& image) const;
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template void jpeg_saver::operator()<image_view_gray16> (image_view_gray16 const& image) const;
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template void jpeg_saver::operator()<image_view_gray16s> (image_view_gray16s const& image) const;
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template void jpeg_saver::operator()<image_view_gray32> (image_view_gray32 const& image) const;
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template void jpeg_saver::operator()<image_view_gray32s> (image_view_gray32s const& image) const;
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template void jpeg_saver::operator()<image_view_gray32f> (image_view_gray32f const& image) const;
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template void jpeg_saver::operator()<image_view_gray64> (image_view_gray64 const& image) const;
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template void jpeg_saver::operator()<image_view_gray64s> (image_view_gray64s const& image) const;
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template void jpeg_saver::operator()<image_view_gray64f> (image_view_gray64f const& image) const;
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} // end ns
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