mapnik::parameters params;
params["type"] = "gdal";
// created with:
// wget http://www.nacis.org/naturalearth/50m/raster/NE2_50m_SR_W.zip
// gdalwarp -t_srs EPSG:3857 -ts 1048 1048 -r bilinear NE2_50M_SR_W.tif natural_earth.tif
params["file"] = "test/natural_earth.tif";
MAPNIK_SHARED_PTR<mapnik::datasource> ds =
mapnik::datasource_cache::instance().create(params);
lyr.set_datasource(ds);
map.MAPNIK_ADD_LAYER(lyr);
mapnik::request m_req(tile_size,tile_size,bbox);
m_req.set_buffer_size(map.buffer_size());
renderer_type ren(backend,map,m_req,1.0,0,0,1,"jpeg",mapnik::SCALING_BILINEAR);
ren.apply();
CHECK(1 == tile.layers_size());
mapnik::vector::tile_layer const& layer = tile.layers(0);
CHECK(std::string("layer") == layer.name());
CHECK(1 == layer.features_size());
mapnik::vector::tile_feature const& f = layer.features(0);
CHECK(static_cast<mapnik::value_integer>(1) == static_cast<mapnik::value_integer>(f.id()));
CHECK(0 == f.geometry_size());
CHECK(f.has_raster());
std::string const& ras_buffer = f.raster();
CHECK(!ras_buffer.empty());
// debug
bool debug = false;
if (debug) {
std::ofstream file("out.jpeg", std::ios::out|std::ios::trunc|std::ios::binary);
file << ras_buffer;
file.close();
}
ren.apply();
// serialize to message
std::string buffer;
CHECK(tile.SerializeToString(&buffer));
CHECK(151 == buffer.size());
// now create new objects
mapnik::Map map2(tile_size,tile_size,"+init=epsg:3857");
tile_type tile2;
CHECK(tile2.ParseFromString(buffer));
std::string key("");
CHECK(false == mapnik::vector_tile_impl::is_solid_extent(tile2,key));
CHECK("" == key);
CHECK(false == mapnik::vector_tile_impl::is_solid_extent(buffer,key));
CHECK("" == key);
CHECK(1 == tile2.layers_size());
vector_tile::Tile_Layer const& layer2 = tile2.layers(0);
CHECK(std::string("layer") == layer2.name());
CHECK(1 == layer2.features_size());
mapnik::layer lyr2("layer",map.srs());
protozero::pbf_reader pbf_tile(buffer.c_str(), buffer.size());
pbf_tile.next();
protozero::pbf_reader layer3 = pbf_tile.get_message();
std::shared_ptr<mapnik::vector_tile_impl::tile_datasource_pbf> ds = std::make_shared<
mapnik::vector_tile_impl::tile_datasource_pbf>(
layer3,0,0,0,map2.width());
CHECK(ds->get_name() == "layer");
ds->set_envelope(bbox);
CHECK( ds->type() == mapnik::datasource::Vector );
