4184f75011
Added visitor pattern to several different methods as well to prepare for image_data_any including compositing. Ref #2633
481 lines
17 KiB
C++
481 lines
17 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) 2014 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/image_util.hpp>
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#include <mapnik/image_util_jpeg.hpp>
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#include <mapnik/image_util_png.hpp>
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#include <mapnik/image_util_tiff.hpp>
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#include <mapnik/image_util_webp.hpp>
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#include <mapnik/image_data.hpp>
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#include <mapnik/image_data_any.hpp>
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#include <mapnik/memory.hpp>
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#include <mapnik/image_view.hpp>
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#include <mapnik/palette.hpp>
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#include <mapnik/map.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/util/variant.hpp>
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// boost
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#include <boost/tokenizer.hpp>
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// agg
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#include "agg_rendering_buffer.h"
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#include "agg_pixfmt_rgba.h"
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#include "agg_color_rgba.h"
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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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#include <algorithm>
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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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rgba_palette const& palette)
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{
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std::ostringstream ss(std::ios::out|std::ios::binary);
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save_to_stream(image, ss, type, palette);
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return ss.str();
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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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save_to_stream(image, ss, 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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rgba_palette const& palette)
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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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save_to_stream<T>(image, file, type, palette);
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}
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else throw ImageWriterException("Could not write file to " + filename );
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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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save_to_stream<T>(image, file, type);
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}
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else throw ImageWriterException("Could not write file to " + filename );
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}
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template <typename T>
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void save_to_stream(T const& image,
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std::ostream & stream,
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std::string const& type,
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rgba_palette const& palette)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver_pal visitor(stream, t, palette);
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mapnik::util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to tiff format (yet)");
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to jpeg format");
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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}
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// This can be removed once image_data_any and image_view_any are the only
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// items using this template
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template <>
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void save_to_stream<image_data_rgba8>(image_data_rgba8 const& image,
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std::ostream & stream,
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std::string const& type,
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rgba_palette const& palette)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver_pal visitor(stream, t, palette);
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visitor(image);
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//mapnik::util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to tiff format (yet)");
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to jpeg format");
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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}
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// This can be removed once image_data_any and image_view_any are the only
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// items using this template
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template <>
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void save_to_stream<image_view_rgba8>(image_view_rgba8 const& image,
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std::ostream & stream,
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std::string const& type,
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rgba_palette const& palette)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver_pal visitor(stream, t, palette);
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visitor(image);
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//mapnik::util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to tiff format (yet)");
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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throw ImageWriterException("palettes are not currently supported when writing to jpeg format");
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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}
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template <typename T>
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void save_to_stream(T const& image,
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std::ostream & stream,
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std::string const& type)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver visitor(stream, t);
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util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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tiff_saver visitor(stream, t);
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util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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jpeg_saver visitor(stream, t);
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util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "webp"))
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{
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webp_saver visitor(stream, t);
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util::apply_visitor(visitor, image);
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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}
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// This can be removed once image_data_any and image_view_any are the only
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// items using this template
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template <>
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void save_to_stream<image_data_rgba8>(image_data_rgba8 const& image,
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std::ostream & stream,
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std::string const& type)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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tiff_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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jpeg_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "webp"))
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{
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webp_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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}
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// This can be removed once image_data_any and image_view_any are the only
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// items using this template
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template <>
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void save_to_stream<image_view_rgba8>(image_view_rgba8 const& image,
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std::ostream & stream,
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std::string const& type)
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{
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if (stream && image.width() > 0 && image.height() > 0)
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{
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std::string t = type;
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std::transform(t.begin(), t.end(), t.begin(), ::tolower);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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png_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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tiff_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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jpeg_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else if (boost::algorithm::starts_with(t, "webp"))
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{
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webp_saver visitor(stream, t);
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visitor(image);
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//util::apply_visitor(visitor, image);
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}
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else throw ImageWriterException("unknown file type: " + type);
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}
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else throw ImageWriterException("Could not write to empty stream" );
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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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boost::optional<std::string> type = type_from_filename(filename);
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if (type)
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{
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save_to_file<T>(image, filename, *type);
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}
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else throw ImageWriterException("Could not write file to " + filename );
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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, rgba_palette const& palette)
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{
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boost::optional<std::string> type = type_from_filename(filename);
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if (type)
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{
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save_to_file<T>(image, filename, *type, palette);
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}
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else throw ImageWriterException("Could not write file to " + filename );
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}
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// image_data_rgba8
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template void save_to_file<image_data_rgba8>(image_data_rgba8 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_data_rgba8>(image_data_rgba8 const&,
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std::string const&,
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std::string const&,
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rgba_palette const& palette);
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template void save_to_file<image_data_rgba8>(image_data_rgba8 const&,
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std::string const&);
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template void save_to_file<image_data_rgba8>(image_data_rgba8 const&,
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std::string const&,
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rgba_palette const& palette);
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template std::string save_to_string<image_data_rgba8>(image_data_rgba8 const&,
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std::string const&);
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template std::string save_to_string<image_data_rgba8>(image_data_rgba8 const&,
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std::string const&,
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rgba_palette const& palette);
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// image_view_rgba8
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template void save_to_file<image_view_rgba8> (image_view_rgba8 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_rgba8> (image_view_rgba8 const&,
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std::string const&,
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std::string const&,
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rgba_palette const& palette);
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template void save_to_file<image_view_rgba8> (image_view_rgba8 const&,
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std::string const&);
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template void save_to_file<image_view_rgba8> (image_view_rgba8 const&,
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std::string const&,
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rgba_palette const& palette);
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template std::string save_to_string<image_view_rgba8> (image_view_rgba8 const&,
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std::string const&);
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template std::string save_to_string<image_view_rgba8> (image_view_rgba8 const&,
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std::string const&,
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rgba_palette const& palette);
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// image_data_any
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template void save_to_file<image_data_any>(image_data_any 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_data_any>(image_data_any const&,
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std::string const&,
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std::string const&,
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rgba_palette const& palette);
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template void save_to_file<image_data_any>(image_data_any const&,
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std::string const&);
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template void save_to_file<image_data_any>(image_data_any const&,
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std::string const&,
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rgba_palette const& palette);
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template std::string save_to_string<image_data_any>(image_data_any const&,
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std::string const&);
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template std::string save_to_string<image_data_any>(image_data_any const&,
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std::string const&,
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rgba_palette const& palette);
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namespace detail {
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struct premultiply_visitor
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{
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template <typename T>
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void operator() (T & data)
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{
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throw std::runtime_error("Error: Premultiply with " + std::string(typeid(data).name()) + " is not supported");
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}
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};
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template <>
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void premultiply_visitor::operator()<image_data_rgba8> (image_data_rgba8 & data)
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{
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if (!data.get_premultiplied())
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{
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agg::rendering_buffer buffer(data.getBytes(),data.width(),data.height(),data.width() * 4);
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agg::pixfmt_rgba32 pixf(buffer);
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pixf.premultiply();
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data.set_premultiplied(true);
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}
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}
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struct demultiply_visitor
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{
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template <typename T>
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void operator() (T & data)
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{
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throw std::runtime_error("Error: Premultiply with " + std::string(typeid(data).name()) + " is not supported");
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}
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};
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template <>
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void demultiply_visitor::operator()<image_data_rgba8> (image_data_rgba8 & data)
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{
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if (data.get_premultiplied())
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{
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agg::rendering_buffer buffer(data.getBytes(),data.width(),data.height(),data.width() * 4);
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agg::pixfmt_rgba32_pre pixf(buffer);
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pixf.demultiply();
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data.set_premultiplied(false);
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}
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}
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} // end detail ns
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template <typename T>
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void premultiply_alpha(T & image)
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{
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util::apply_visitor(detail::premultiply_visitor(), image);
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}
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template void premultiply_alpha<image_data_any> (image_data_any &);
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// Temporary, can be removed once image_view_any and image_data_any are the only ones passed
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template <>
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void premultiply_alpha<image_data_rgba8>(image_data_rgba8 & image)
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{
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detail::premultiply_visitor visit;
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visit(image);
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}
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template <typename T>
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void demultiply_alpha(T & image)
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{
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util::apply_visitor(detail::demultiply_visitor(), image);
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}
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template void demultiply_alpha<image_data_any> (image_data_any &);
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// Temporary, can be removed once image_view_any and image_data_any are the only ones passed
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template <>
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void demultiply_alpha<image_data_rgba8>(image_data_rgba8 & image)
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{
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detail::demultiply_visitor visit;
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visit(image);
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}
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} // end ns
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