PNGIO.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
/***********************************************************************************/
/*  Copyright 2011 WSL Institute for Snow and Avalanche Research    SLF-DAVOS      */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    MeteoIO is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PNGIO_H
#define PNGIO_H
 
#include <meteoio/IOInterface.h>
#include <meteoio/Graphics.h>
 
#include <string>
#include <png.h>
 
namespace mio {
class PNGIO : public IOInterface {
        public:
                PNGIO(const std::string& configfile);
                PNGIO(const PNGIO&);
                PNGIO(const Config& cfgreader);
                ~PNGIO() noexcept;
 
                PNGIO& operator=(const PNGIO&); 
 
                virtual void write2DGrid(const Grid2DObject& grid_in, const std::string& options) override;
                virtual void write2DGrid(const Grid2DObject& grid_in, const MeteoGrids::Parameters& parameter, const Date& date) override;
 
        private:
                void setOptions();
                static void parse_size(const std::string& size_spec, size_t& width, size_t& height);
                double getScaleFactor(const size_t& grid_w, const size_t& grid_h) const;
                Grid2DObject scaleGrid(const Grid2DObject& grid_in) const;
                size_t setLegend(const size_t &ncols, const size_t &nrows, const double &min, const double &max, Array2D<double> &legend_array) const;
                static png_color* setPalette(const Gradient &gradient, png_structp& png_ptr, png_infop& info_ptr);
                void createMetadata(const Grid2DObject& grid);
                void writeMetadata(png_structp &png_ptr, png_infop &info_ptr);
                void setFile(const std::string& filename, png_structp& png_ptr, png_infop& info_ptr, const size_t &width, const size_t &height);
                void writeWorldFile(const Grid2DObject& grid_in, const std::string& filename) const;
                void writeDataSection(const Grid2DObject &grid, const Array2D<double> &legend_array, const Gradient &gradient, const size_t &full_width, const png_structp &png_ptr, png_infop& info_ptr);
                void closePNG(png_structp& png_ptr, png_infop& info_ptr, png_color *palette);
                static std::string decimal_to_dms(const double& decimal);
 
                const Config cfg;
                FILE *fp; //since passing fp always fail...
                bool autoscale;
                bool has_legend;
                bool has_world_file; 
                bool optimize_for_speed; 
                bool indexed_png; 
                unsigned char nr_levels; 
                std::string coordout, coordoutparam; //projection parameters
                std::string grid2dpath;
 
                std::string scaling;
                size_t min_w, min_h, max_w, max_h;
 
                std::vector<std::string> metadata_key, metadata_text;
 
                static const std::string default_extension;
                static const double plugin_nodata; //plugin specific nodata value, e.g. -999
                static const unsigned char channel_depth;
                static const unsigned char channel_max_color;
                static const unsigned char transparent_grey;
};
 
} //namespace
#endif