-- Jamroot --

lib mapnik : : <name>mapnik <search>/opt/mapnik/lib ;

exe  for_each_pixel :
    main.cpp
    .//mapnik
    :
    <include>/usr/local/include/boost-1_35/
    <include>/usr/local/include
    <include>/opt/mapnik/include
    ;

-- c++ --

#include <boost/gil/gil_all.hpp>
#include <iostream>
#include <mapnik/image_data.hpp>
#include <mapnik/image_util.hpp>

struct coloriser
{
   explicit coloriser(mapnik::Color & c)
      : c_(c) {}

   coloriser& coloriser::operator=(const coloriser& rhs)
   {
      if ( this == &rhs) return *this;
      c_ = rhs.c_;
      return *this;
   }

   template <typename PixelType>
   void operator() (PixelType & p)
   {
      // use c to modify p
      p[0] = c_.red();
      p[1] = c_.green();
      p[2] = c_.blue();
   }
   mapnik::Color & c_;
};


int main(int argc, char** argv)
{
   if ( argc != 2)
   {
      std::cout << "Usage: ./for_each_pixel  <pngfile>\n";
      return EXIT_FAILURE;
   }
   std::cout << "for_each_pixel\n";

   mapnik::ImageData32 data(400,400);
   data.set(0xff000044);

   boost::gil::rgba8_view_t view = interleaved_view(data.width(),data.height(),
                                                    (boost::gil::rgba8_pixel_t*)data.getData(),
                                                    data.width() * 4);

   mapnik::Color c(0,255,0);
   coloriser op(c);
   for_each_pixel(view,op);
   mapnik::save_to_file<mapnik::ImageData32>(data,"test.png","png");
   return EXIT_SUCCESS;
}