302 lines
10 KiB
C++
302 lines
10 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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#ifndef MAPNIK_IMAGE_UTIL_HPP
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#define MAPNIK_IMAGE_UTIL_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/graphics.hpp>
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#include <mapnik/palette.hpp>
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/optional.hpp>
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// stl
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#include <string>
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namespace mapnik {
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class Map;
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class ImageWriterException : public std::exception
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{
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private:
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std::string message_;
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public:
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ImageWriterException(const std::string& message)
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: message_(message) {}
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~ImageWriterException() throw() {}
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virtual const char* what() const throw()
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{
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return message_.c_str();
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}
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};
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#if defined(HAVE_CAIRO)
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MAPNIK_DECL 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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#endif
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template <typename T>
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MAPNIK_DECL 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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template <typename T>
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MAPNIK_DECL 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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// guess type from file extension
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template <typename T>
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MAPNIK_DECL void save_to_file(T const& image,
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std::string const& filename);
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template <typename T>
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MAPNIK_DECL void save_to_file(T const& image,
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std::string const& filename,
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rgba_palette const& palette);
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template <typename T>
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MAPNIK_DECL std::string save_to_string(T const& image,
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std::string const& type);
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template <typename T>
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MAPNIK_DECL 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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template <typename T>
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void save_as_png(T const& image,
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std::string const& filename,
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rgba_palette const& palette);
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#if defined(HAVE_JPEG)
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template <typename T>
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void save_as_jpeg(std::string const& filename,
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int quality,
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T const& image);
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#endif
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inline bool is_png (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".png"));
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}
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inline bool is_jpeg (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".jpg")) ||
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boost::algorithm::iends_with(filename,std::string(".jpeg"));
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}
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inline bool is_tiff (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".tif")) ||
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boost::algorithm::iends_with(filename,std::string(".tiff"));
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}
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inline bool is_pdf (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".pdf"));
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}
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inline bool is_svg (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".svg"));
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}
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inline bool is_ps (std::string const& filename)
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{
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return boost::algorithm::iends_with(filename,std::string(".ps"));
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}
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inline boost::optional<std::string> type_from_filename(std::string const& filename)
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{
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typedef boost::optional<std::string> result_type;
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if (is_png(filename)) return result_type("png");
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if (is_jpeg(filename)) return result_type("jpeg");
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if (is_tiff(filename)) return result_type("tiff");
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if (is_pdf(filename)) return result_type("pdf");
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if (is_svg(filename)) return result_type("svg");
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if (is_ps(filename)) return result_type("ps");
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return result_type();
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}
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inline std::string guess_type( const std::string & filename )
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{
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std::string::size_type idx = filename.find_last_of(".");
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if ( idx != std::string::npos ) {
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return filename.substr( idx + 1 );
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}
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return "<unknown>";
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}
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template <typename T>
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double distance(T x0,T y0,T x1,T y1)
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{
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double dx = x1-x0;
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double dy = y1-y0;
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return std::sqrt(dx * dx + dy * dy);
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}
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// add 1-px border around image - useful for debugging alignment issues
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template <typename T>
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void add_border(T & image)
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{
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for (unsigned x = 0; x < image.width();++x)
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{
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image(x,0) = 0xff0000ff; // red
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image(x,image.height()-1) = 0xff00ff00; //green
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}
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for (unsigned y = 0; y < image.height();++y)
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{
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image(0,y) = 0xff00ffff; //yellow
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image(image.width()-1,y) = 0xffff0000; // blue
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}
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}
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// IMAGE SCALING
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enum scaling_method_e
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{
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SCALING_NEAR=0,
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SCALING_BILINEAR=1,
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SCALING_BICUBIC=2,
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SCALING_SPLINE16=3,
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SCALING_SPLINE36=4,
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SCALING_HANNING=5,
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SCALING_HAMMING=6,
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SCALING_HERMITE=7,
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SCALING_KAISER=8,
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SCALING_QUADRIC=9,
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SCALING_CATROM=10,
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SCALING_GAUSSIAN=11,
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SCALING_BESSEL=12,
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SCALING_MITCHELL=13,
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SCALING_SINC=14,
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SCALING_LANCZOS=15,
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SCALING_BLACKMAN=16
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};
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scaling_method_e get_scaling_method_by_name (std::string name);
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template <typename Image>
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void scale_image_agg (Image& target,const Image& source, scaling_method_e scaling_method, double scale_factor, double x_off_f=0, double y_off_f=0, double filter_radius=2, double ratio=1);
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template <typename Image>
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void scale_image_bilinear_old (Image& target,const Image& source, double x_off_f=0, double y_off_f=0);
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template <typename Image>
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void scale_image_bilinear8 (Image& target,const Image& source, double x_off_f=0, double y_off_f=0);
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/////////// save_to_file ////////////////////////////////////////////////
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inline MAPNIK_DECL void save_to_file(image_32 const& image,
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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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inline MAPNIK_DECL 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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inline MAPNIK_DECL 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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//////////////////////////////////////////////////////////////////////////
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inline MAPNIK_DECL 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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inline MAPNIK_DECL 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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#ifdef _MSC_VER
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template MAPNIK_DECL 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&);
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template MAPNIK_DECL 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&);
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template MAPNIK_DECL void save_to_file<image_data_32>(image_data_32 const&,
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std::string const&);
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template MAPNIK_DECL 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&);
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template MAPNIK_DECL 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 MAPNIK_DECL 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&);
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template MAPNIK_DECL 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 MAPNIK_DECL 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&);
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template MAPNIK_DECL 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 MAPNIK_DECL 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&);
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#endif
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}
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#endif // MAPNIK_IMAGE_UTIL_HPP
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