mapnik/bindings/python/mapnik_image_view.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/
//$Id$

extern "C"
{
#include <png.h>
}

#include <boost/python.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_view.hpp>
#include <mapnik/jpeg_io.hpp>
#include <mapnik/png_io.hpp>
#include <sstream>

using mapnik::ImageData32;
using mapnik::image_view;
using mapnik::save_to_file;

// output 'raw' pixels
PyObject* view_tostring1(image_view<ImageData32> const& view)
{
   std::ostringstream ss(std::ios::out|std::ios::binary);
   for (unsigned i=0;i<view.height();i++)
   {
      ss.write(reinterpret_cast<const char*>(view.getRow(i)), 
               view.width() * sizeof(image_view<ImageData32>::pixel_type));
   }
   return ::PyString_FromStringAndSize((const char*)ss.str().c_str(),ss.str().size());
}

// encode (png,jpeg)
PyObject* view_tostring2(image_view<ImageData32> const & view, std::string const& format)
{
   std::ostringstream ss(std::ios::out|std::ios::binary);
   if (format == "png") save_as_png(ss,view);
   else if (format == "png256") save_as_png256(ss,view);
   else if (format == "jpeg") save_as_jpeg(ss,85,view);
   else throw mapnik::ImageWriterException("unknown format: " + format);
   return ::PyString_FromStringAndSize((const char*)ss.str().c_str(),ss.str().size());
}

void (*save_view1)(image_view<ImageData32> const&, std::string const&,std::string const&) = mapnik::save_to_file;
void (*save_view2)(image_view<ImageData32> const&, std::string const&) = mapnik::save_to_file;

void export_image_view()
{
    using namespace boost::python;
    class_<image_view<ImageData32> >("ImageView","A view into an image.",no_init)
       .def("width",&image_view<ImageData32>::width)
       .def("height",&image_view<ImageData32>::height)
       .def("tostring",&view_tostring1)
       .def("tostring",&view_tostring2)
       .def("save",save_view1)
       .def("save",save_view2)
       ;
}