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#include <mbgl/tile/vector_tile_data.hpp>
namespace mbgl {
class VectorTileLayer;
Value parseValue(protozero::pbf_reader data) {
while (data.next()) {
switch (data.tag()) {
case 1: // string_value
return data.get_string();
case 2: // float_value
return static_cast<double>(data.get_float());
case 3: // double_value
return data.get_double();
case 4: // int_value
return data.get_int64();
case 5: // uint_value
return data.get_uint64();
case 6: // sint_value
return data.get_sint64();
case 7: // bool_value
return data.get_bool();
default:
data.skip();
break;
}
}
return false;
}
VectorTileFeature::VectorTileFeature(protozero::pbf_reader feature_pbf,
const VectorTileLayer& layer_)
: layer(layer_) {
while (feature_pbf.next()) {
switch (feature_pbf.tag()) {
case 1: // id
id = { feature_pbf.get_uint64() };
break;
case 2: // tags
tags_iter = feature_pbf.get_packed_uint32();
break;
case 3: // type
type = static_cast<FeatureType>(feature_pbf.get_enum());
break;
case 4: // geometry
geometry_iter = feature_pbf.get_packed_uint32();
break;
default:
feature_pbf.skip();
break;
}
}
}
optional<Value> VectorTileFeature::getValue(const std::string& key) const {
auto keyIter = layer.keysMap.find(key);
if (keyIter == layer.keysMap.end()) {
return optional<Value>();
}
auto start_itr = tags_iter.first;
const auto& end_itr = tags_iter.second;
while (start_itr != end_itr) {
uint32_t tag_key = static_cast<uint32_t>(*start_itr++);
if (layer.keysMap.size() <= tag_key) {
throw std::runtime_error("feature referenced out of range key");
}
if (start_itr == end_itr) {
throw std::runtime_error("uneven number of feature tag ids");
}
uint32_t tag_val = static_cast<uint32_t>(*start_itr++);
;
if (layer.values.size() <= tag_val) {
throw std::runtime_error("feature referenced out of range value");
}
if (tag_key == keyIter->second) {
return layer.values[tag_val];
}
}
return optional<Value>();
}
std::unordered_map<std::string, Value> VectorTileFeature::getProperties() const {
std::unordered_map<std::string, Value> properties;
auto start_itr = tags_iter.first;
const auto& end_itr = tags_iter.second;
while (start_itr != end_itr) {
uint32_t tag_key = static_cast<uint32_t>(*start_itr++);
if (start_itr == end_itr) {
throw std::runtime_error("uneven number of feature tag ids");
}
uint32_t tag_val = static_cast<uint32_t>(*start_itr++);
properties[layer.keys.at(tag_key)] = layer.values.at(tag_val);
}
return properties;
}
optional<FeatureIdentifier> VectorTileFeature::getID() const {
return id;
}
GeometryCollection VectorTileFeature::getGeometries() const {
uint8_t cmd = 1;
uint32_t length = 0;
int32_t x = 0;
int32_t y = 0;
const float scale = float(util::EXTENT) / layer.extent;
GeometryCollection lines;
lines.emplace_back();
GeometryCoordinates* line = &lines.back();
auto g_itr = geometry_iter;
while (g_itr.first != g_itr.second) {
if (length == 0) {
uint32_t cmd_length = static_cast<uint32_t>(*g_itr.first++);
cmd = cmd_length & 0x7;
length = cmd_length >> 3;
}
--length;
if (cmd == 1 || cmd == 2) {
x += protozero::decode_zigzag32(static_cast<uint32_t>(*g_itr.first++));
y += protozero::decode_zigzag32(static_cast<uint32_t>(*g_itr.first++));
if (cmd == 1 && !line->empty()) { // moveTo
lines.emplace_back();
line = &lines.back();
}
line->emplace_back(::round(x * scale), ::round(y * scale));
} else if (cmd == 7) { // closePolygon
if (!line->empty()) {
line->push_back((*line)[0]);
}
} else {
throw std::runtime_error("unknown command");
}
}
if (layer.version >= 2 || type != FeatureType::Polygon) {
return lines;
}
return fixupPolygons(lines);
}
VectorTileData::VectorTileData(std::shared_ptr<const std::string> data_) : data(std::move(data_)) {
}
util::ptr<GeometryTileLayer> VectorTileData::getLayer(const std::string& name) const {
if (!parsed) {
parsed = true;
protozero::pbf_reader tile_pbf(*data);
while (tile_pbf.next(3)) {
util::ptr<VectorTileLayer> layer =
std::make_shared<VectorTileLayer>(tile_pbf.get_message());
layers.emplace(layer->name, layer);
}
}
auto layer_it = layers.find(name);
if (layer_it != layers.end()) {
return layer_it->second;
}
return nullptr;
}
VectorTileLayer::VectorTileLayer(protozero::pbf_reader layer_pbf) {
while (layer_pbf.next()) {
switch (layer_pbf.tag()) {
case 1: // name
name = layer_pbf.get_string();
break;
case 2: // feature
features.push_back(layer_pbf.get_message());
break;
case 3: // keys
{
auto iter = keysMap.emplace(layer_pbf.get_string(), keysMap.size());
keys.emplace_back(std::reference_wrapper<const std::string>(iter.first->first));
} break;
case 4: // values
values.emplace_back(parseValue(layer_pbf.get_message()));
break;
case 5: // extent
extent = layer_pbf.get_uint32();
break;
case 15: // version
version = layer_pbf.get_uint32();
break;
default:
layer_pbf.skip();
break;
}
}
}
util::ptr<const GeometryTileFeature> VectorTileLayer::getFeature(std::size_t i) const {
return std::make_shared<VectorTileFeature>(features.at(i), *this);
}
std::string VectorTileLayer::getName() const {
return name;
}
} // namespace mbgl
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