137 lines
4.6 KiB
C++
137 lines
4.6 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) 2006 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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//$Id: image_util.cpp 36 2005-04-05 14:32:18Z pavlenko $
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extern "C"
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{
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#include <png.h>
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}
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// mapnik
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#include <mapnik/image_util.hpp>
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#include <mapnik/png_io.hpp>
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#include <mapnik/jpeg_io.hpp>
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#include <mapnik/graphics.hpp>
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#include <mapnik/memory.hpp>
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#include <mapnik/image_view.hpp>
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// stl
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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namespace mapnik
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{
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template <typename T>
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std::string save_to_string(T const& image,
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std::string const& type)
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{
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std::ostringstream ss(std::ios::out|std::ios::binary);
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//all this should go into image_writer factory
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if (type=="png") save_as_png(ss,image);
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else if (type == "png256") save_as_png256(ss,image);
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else if (boost::algorithm::istarts_with(type,std::string("jpeg")))
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{
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int quality = 85;
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try
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{
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if(type.substr(4).length() != 0)
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{
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quality = boost::lexical_cast<int>(type.substr(4));
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if(quality<1 || quality>100)
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throw ImageWriterException("invalid jpeg quality: " + type.substr(4));
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}
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save_as_jpeg(ss,quality,image);
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}
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catch(boost::bad_lexical_cast &)
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{
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throw ImageWriterException("invalid jpeg quality: " + type.substr(4));
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}
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}
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else throw ImageWriterException("unknown file type: " + type);
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return ss.str();
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}
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template <typename T>
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void save_to_file(T const& image,
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std::string const& filename,
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std::string const& type)
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{
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std::ofstream file (filename.c_str(), std::ios::out| std::ios::trunc|std::ios::binary);
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if (file)
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{
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//all this should go into image_writer factory
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if (type=="png") save_as_png(file,image);
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else if (type == "png256") save_as_png256(file,image);
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else if (boost::algorithm::istarts_with(type,std::string("jpeg")))
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{
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int quality = 85;
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try
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{
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if(type.substr(4).length() != 0)
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{
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quality = boost::lexical_cast<int>(type.substr(4));
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if(quality<0 || quality>100)
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throw ImageWriterException("invalid jpeg quality: " + type.substr(4) + " out of bounds");
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}
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save_as_jpeg(file,quality,image);
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}
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catch(boost::bad_lexical_cast &)
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{
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throw ImageWriterException("invalid jpeg quality: " + type.substr(4) + " not a number");
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}
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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}
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template <typename T>
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void save_to_file(T const& image,std::string const& filename)
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{
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std::string type = type_from_filename(filename);
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save_to_file<T>(image,filename,type);
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}
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template void save_to_file<ImageData32>(ImageData32 const&,
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std::string const&,
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std::string const&);
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template void save_to_file<ImageData32>(ImageData32 const&,
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std::string const&);
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template std::string save_to_string<ImageData32>(ImageData32 const&,
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std::string const&);
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template void save_to_file<image_view<ImageData32> > (image_view<ImageData32> const&,
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std::string const&,
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std::string const&);
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template void save_to_file<image_view<ImageData32> > (image_view<ImageData32> const&,
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std::string const&);
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template std::string save_to_string<image_view<ImageData32> > (image_view<ImageData32> const&,
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std::string const&);
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}
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