static void grid2utf2(T const& grid_type,
boost::python::list& l,
std::vector<typename T::lookup_type>& key_order,
unsigned int resolution)
{
typename T::data_type const& data = grid_type.data();
typename T::feature_key_type const& feature_keys = grid_type.get_feature_keys();
typename T::key_type keys;
typename T::key_type::const_iterator key_pos;
typename T::feature_key_type::const_iterator feature_pos;
// start counting at utf8 codepoint 32, aka space character
uint16_t codepoint = 32;
mapnik::grid::data_type target(data.width()/resolution,data.height()/resolution);
mapnik::scale_grid(target,grid_type.data(),0.0,0.0);
unsigned array_size = target.width();
for (unsigned y = 0; y < target.height(); ++y)
{
uint16_t idx = 0;
boost::scoped_array<Py_UNICODE> line(new Py_UNICODE[array_size]);
mapnik::grid::value_type * row = target.getRow(y);
unsigned x;
for (x = 0; x < target.width(); ++x)
{
feature_pos = feature_keys.find(row[x]);
if (feature_pos != feature_keys.end())
{
mapnik::grid::lookup_type val = feature_pos->second;
key_pos = keys.find(val);
if (key_pos == keys.end())
{
// Create a new entry for this key. Skip the codepoints that
// can't be encoded directly in JSON.
if (codepoint == 34) ++codepoint; // Skip "
else if (codepoint == 92) ++codepoint; // Skip backslash
keys[val] = codepoint;
key_order.push_back(val);
line[idx++] = static_cast<Py_UNICODE>(codepoint);
++codepoint;
}
else
{
line[idx++] = static_cast<Py_UNICODE>(key_pos->second);
}
}
// else, shouldn't get here...
}
l.append(boost::python::object(
boost::python::handle<>(
PyUnicode_FromUnicode(line.get(), array_size))));
}
}
static void grid2utf(T const& grid_type,
Local<Array>& l,
std::vector<typename T::lookup_type>& key_order,
unsigned int resolution)
{
typename T::feature_key_type const& feature_keys = grid_type.get_feature_keys();
typename T::key_type keys;
typename T::key_type::const_iterator key_pos;
typename T::feature_key_type::const_iterator feature_pos;
// start counting at utf8 codepoint 32, aka space character
uint16_t codepoint = 32;
uint16_t row_idx = 0;
unsigned array_size = static_cast<unsigned int>(grid_type.width()/resolution);
for (unsigned y = 0; y < grid_type.height(); y=y+resolution)
{
uint16_t idx = 0;
boost::scoped_array<uint16_t> line(new uint16_t[array_size]);
typename T::value_type const* row = grid_type.getRow(y);
for (unsigned x = 0; x < grid_type.width(); x=x+resolution)
{
// todo - this lookup is expensive
feature_pos = feature_keys.find(row[x]);
if (feature_pos != feature_keys.end())
{
typename T::lookup_type const& val = feature_pos->second;
key_pos = keys.find(val);
if (key_pos == keys.end())
{
// Create a new entry for this key. Skip the codepoints that
// can't be encoded directly in JSON.
if (codepoint == 34) ++codepoint; // Skip "
else if (codepoint == 92) ++codepoint; // Skip backslash
keys[val] = codepoint;
key_order.push_back(val);
line[idx++] = static_cast<uint16_t>(codepoint);
++codepoint;
}
else
{
line[idx++] = static_cast<uint16_t>(key_pos->second);
}
}
// else, shouldn't get here...
}
l->Set(row_idx, String::New(line.get(),array_size));
++row_idx;
}
}