First attempt at a simple nik2img alternative

SConstruct

@@ -69,3 +69,5 @@ env.Program(target='carto',
 env.Program(target='tools/expression_test',
             source=env.Object(source='tools/expression_test.cpp') + objects)
 
+env.Program(target='tools/render',
+            source=env.Object(source='tools/render.cpp') + objects)

tools/render.cpp

@@ -0,0 +1,93 @@
+#include <iostream>
+#include <fstream>
+
+#include <mapnik/load_map.hpp>
+#include <mapnik/graphics.hpp>
+#include <mapnik/agg_renderer.hpp>
+#include <mapnik/image_util.hpp>
+#include <mapnik/save_map.hpp>
+#include <mapnik/datasource_cache.hpp>
+#include <mapnik/font_engine_freetype.hpp>
+
+#include <boost/program_options.hpp>
+#include <boost/algorithm/string.hpp>
+
+
+
+int main(int argc, char **argv) {
+
+    std::cout << "Using MAPNIKDIR = " << MAPNIKDIR << "\n";
+
+    namespace po = boost::program_options;
+
+    std::string mapnik_input_dir = MAPNIKDIR;
+
+    std::string input_file;
+    int width, height;
+
+    po::options_description desc("carto");
+    desc.add_options()
+        ("help,h", "produce this usage message")
+        ("version,V","print version string")
+        ("xml", po::value<std::string>(&input_file),  "input xml style")
+        ("width",  po::value<int>(&width),  "map width")
+        ("height", po::value<int>(&height), "map height");
+
+
+    std::string usage("\nusage: render map.xml [--width 800] [--height 600]");
+
+    po::positional_options_description p;
+    p.add("xml",1);
+
+    po::variables_map vm;
+    po::store(po::command_line_parser(argc, argv).options(desc).positional(p).run(), vm);
+    po::notify(vm);
+
+    if (vm.count("version"))
+    {
+        std::cout << "version 0.0.0" << std::endl;
+        return 1;
+    }
+
+    if (vm.count("help")) 
+    {
+        std::cout << desc << usage << std::endl;
+        return 1;
+    }
+
+    if (!vm.count("xml"))
+    {
+        std::cout << "Please provide an input xml file\n" << std::endl;
+        std::cout << desc << usage << std::endl;
+        return 1;
+    }
+
+    if (!vm.count("width")) width = 800;
+    if (!vm.count("height")) height = 600;
+
+    try {
+
+        std::string mapnik_dir = MAPNIKDIR;
+        mapnik::datasource_cache::instance()->register_datasources(mapnik_dir);
+        mapnik::freetype_engine::register_fonts(mapnik_dir + "/../fonts/", TRUE);
+        mapnik::freetype_engine::register_fonts("/usr/share/fonts/", TRUE);
+
+        mapnik::Map m(width,height);
+
+        mapnik::load_map(m, input_file, TRUE);
+
+        mapnik::image_32 buf(m.width(),m.height());
+        mapnik::agg_renderer<mapnik::image_32> ren(m,buf);
+        ren.apply();
+
+        mapnik::save_to_file(buf,"demo.png","png");
+
+
+    } catch (std::exception& e) {
+        std::cerr << "Error: " << e.what() << "\n";
+    } catch(...) {
+        std::cerr << "Error: Unknown error\n";
+    }
+
+    return 0;
+}