498 lines
17 KiB
C++
498 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) 2011 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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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/tiff_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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#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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// jpeg
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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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#ifdef HAVE_CAIRO
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#include <mapnik/cairo_renderer.hpp>
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#include <cairo-features.h>
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#endif
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// boost
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#include <boost/foreach.hpp>
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#include <boost/tokenizer.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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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(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(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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void handle_png_options(std::string const& type,
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int * colors,
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int * compression,
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int * strategy,
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int * trans_mode,
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double * gamma,
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bool * use_octree)
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{
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if (type == "png" || type == "png24" || type == "png32")
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{
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// Shortcut when the user didn't specify any flags after the colon.
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// Paletted images specify "png8 or png256".
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*colors = -1;
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return;
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}
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// TODO - convert to spirit parser
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if (type.length() > 6){
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boost::char_separator<char> sep(":");
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boost::tokenizer< boost::char_separator<char> > tokens(type, sep);
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BOOST_FOREACH(std::string t, tokens)
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{
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if (t == "png" || t == "png24" || t == "png32")
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{
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*colors = -1;
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}
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else if (t == "m=h")
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{
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*use_octree = false;
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}
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else if (t == "m=o")
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{
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*use_octree = true;
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}
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else if (boost::algorithm::starts_with(t, "c="))
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{
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if (*colors < 0)
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throw ImageWriterException("invalid color parameter: unavailable for true color images");
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if (!mapnik::util::string2int(t.substr(2),*colors) || *colors < 0 || *colors > 256)
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throw ImageWriterException("invalid color parameter: " + t.substr(2));
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}
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else if (boost::algorithm::starts_with(t, "t="))
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{
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if (*colors < 0)
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throw ImageWriterException("invalid trans_mode parameter: unavailable for true color images");
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if (!mapnik::util::string2int(t.substr(2),*trans_mode) || *trans_mode < 0 || *trans_mode > 2)
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throw ImageWriterException("invalid trans_mode parameter: " + t.substr(2));
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}
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else if (boost::algorithm::starts_with(t, "g="))
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{
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if (*colors < 0)
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throw ImageWriterException("invalid gamma parameter: unavailable for true color images");
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if (!mapnik::util::string2double(t.substr(2),*gamma) || *gamma < 0)
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{
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throw ImageWriterException("invalid gamma parameter: " + t.substr(2));
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}
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}
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else if (boost::algorithm::starts_with(t, "z="))
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{
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/*
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#define Z_NO_COMPRESSION 0
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#define Z_BEST_SPEED 1
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#define Z_BEST_COMPRESSION 9
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#define Z_DEFAULT_COMPRESSION (-1)
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*/
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if (!mapnik::util::string2int(t.substr(2),*compression)
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|| *compression < Z_DEFAULT_COMPRESSION
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|| *compression > Z_BEST_COMPRESSION)
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{
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throw ImageWriterException("invalid compression parameter: " + t.substr(2) + " (only -1 through 9 are valid)");
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}
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}
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else if (boost::algorithm::starts_with(t, "s="))
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{
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std::string const& s = t.substr(2);
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if (s == "default")
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{
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*strategy = Z_DEFAULT_STRATEGY;
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}
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else if (s == "filtered")
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{
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*strategy = Z_FILTERED;
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}
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else if (s == "huff")
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{
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*strategy = Z_HUFFMAN_ONLY;
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}
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else if (s == "rle")
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{
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*strategy = Z_RLE;
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}
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else
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{
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throw ImageWriterException("invalid compression strategy parameter: " + s);
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}
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}
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}
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}
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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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//all this should go into image_writer factory
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std::string t = boost::algorithm::to_lower_copy(type);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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int colors = 256;
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int compression = Z_DEFAULT_COMPRESSION;
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int strategy = Z_DEFAULT_STRATEGY;
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int trans_mode = -1;
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double gamma = -1;
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bool use_octree = true;
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handle_png_options(t,
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&colors,
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&compression,
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&strategy,
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&trans_mode,
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&gamma,
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&use_octree);
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if (palette.valid())
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save_as_png8_pal(stream, image, palette, compression, strategy);
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else if (colors < 0)
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save_as_png(stream, image, compression, strategy);
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else if (use_octree)
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save_as_png8_oct(stream, image, colors, compression, strategy);
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else
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save_as_png8_hex(stream, image, colors, compression, strategy, trans_mode, gamma);
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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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#if defined(HAVE_JPEG)
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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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#endif
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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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//all this should go into image_writer factory
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std::string t = boost::algorithm::to_lower_copy(type);
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if (t == "png" || boost::algorithm::starts_with(t, "png"))
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{
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int colors = 256;
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int compression = Z_DEFAULT_COMPRESSION;
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int strategy = Z_DEFAULT_STRATEGY;
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int trans_mode = -1;
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double gamma = -1;
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bool use_octree = true;
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handle_png_options(t,
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&colors,
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&compression,
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&strategy,
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&trans_mode,
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&gamma,
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&use_octree);
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if (colors < 0)
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save_as_png(stream, image, compression, strategy);
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else if (use_octree)
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save_as_png8_oct(stream, image, colors, compression, strategy);
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else
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save_as_png8_hex(stream, image, colors, compression, strategy, trans_mode, gamma);
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}
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else if (boost::algorithm::starts_with(t, "tif"))
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{
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save_as_tiff(stream, image);
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}
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#if defined(HAVE_JPEG)
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else if (boost::algorithm::starts_with(t, "jpeg"))
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{
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int quality = 85;
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std::string const& val = t.substr(4);
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if (!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 ImageWriterException("invalid jpeg quality: '" + val + "'");
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}
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}
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save_as_jpeg(stream, quality, image);
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}
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#endif
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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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}
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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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}
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#if defined(HAVE_CAIRO)
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// TODO - move to separate cairo_io.hpp
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void save_to_cairo_file(mapnik::Map const& map, std::string const& filename, double scale_factor)
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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_cairo_file(map,filename,*type,scale_factor);
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}
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}
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void save_to_cairo_file(mapnik::Map const& map,
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std::string const& filename,
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std::string const& type,
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double scale_factor)
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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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Cairo::RefPtr<Cairo::Surface> surface;
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unsigned width = map.width();
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unsigned height = map.height();
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if (type == "pdf")
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{
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#if defined(CAIRO_HAS_PDF_SURFACE)
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surface = Cairo::PdfSurface::create(filename,width,height);
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#else
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throw ImageWriterException("PDFSurface not supported in the cairo backend");
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#endif
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}
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#if defined(CAIRO_HAS_SVG_SURFACE)
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else if (type == "svg")
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{
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surface = Cairo::SvgSurface::create(filename,width,height);
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}
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#endif
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#if defined(CAIRO_HAS_PS_SURFACE)
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else if (type == "ps")
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{
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surface = Cairo::PsSurface::create(filename,width,height);
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}
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#endif
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#if defined(CAIRO_HAS_IMAGE_SURFACE)
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else if (type == "ARGB32")
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{
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surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32,width,height);
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}
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else if (type == "RGB24")
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{
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surface = Cairo::ImageSurface::create(Cairo::FORMAT_RGB24,width,height);
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}
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#endif
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else
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{
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throw ImageWriterException("unknown file type: " + type);
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}
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Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create(surface);
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// TODO - expose as user option
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/*
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if (type == "ARGB32" || type == "RGB24")
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{
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context->set_antialias(Cairo::ANTIALIAS_NONE);
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}
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*/
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mapnik::cairo_renderer<Cairo::Context> ren(map, context, scale_factor);
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ren.apply();
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if (type == "ARGB32" || type == "RGB24")
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{
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surface->write_to_png(filename);
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}
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surface->finish();
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}
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}
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#endif
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template void save_to_file<image_data_32>(image_data_32 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_32>(image_data_32 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_32>(image_data_32 const&,
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std::string const&);
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template void save_to_file<image_data_32>(image_data_32 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_32>(image_data_32 const&,
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std::string const&);
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template std::string save_to_string<image_data_32>(image_data_32 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<image_data_32> > (image_view<image_data_32> 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<image_data_32> > (image_view<image_data_32> 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<image_data_32> > (image_view<image_data_32> const&,
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std::string const&);
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template void save_to_file<image_view<image_data_32> > (image_view<image_data_32> 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<image_data_32> > (image_view<image_data_32> const&,
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std::string const&);
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template std::string save_to_string<image_view<image_data_32> > (image_view<image_data_32> const&,
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std::string const&,
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rgba_palette const& palette);
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void save_to_file(image_32 const& image,std::string const& file)
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{
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save_to_file<image_data_32>(image.data(), file);
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}
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void save_to_file (image_32 const& image,
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std::string const& file,
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std::string const& type)
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{
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save_to_file<image_data_32>(image.data(), file, type);
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}
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void save_to_file (image_32 const& image,
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std::string const& file,
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std::string const& type,
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rgba_palette const& palette)
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{
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save_to_file<image_data_32>(image.data(), file, type, palette);
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}
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std::string save_to_string(image_32 const& image,
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std::string const& type)
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{
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return save_to_string<image_data_32>(image.data(), type);
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}
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std::string save_to_string(image_32 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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return save_to_string<image_data_32>(image.data(), type, palette);
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}
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}
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