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#include <mbgl/tile/vector_tile_data.hpp>
#include <mbgl/util/constants.hpp>
namespace mbgl {
Value parseValue(protozero::pbf_reader data) {
Value value;
while (data.next()) {
switch (data.tag()) {
case 1: // string_value
value = data.get_string();
break;
case 2: // float_value
value = static_cast<double>(data.get_float());
break;
case 3: // double_value
value = data.get_double();
break;
case 4: // int_value
value = data.get_int64();
break;
case 5: // uint_value
value = data.get_uint64();
break;
case 6: // sint_value
value = data.get_sint64();
break;
case 7: // bool_value
value = data.get_bool();
break;
default:
data.skip();
break;
}
}
return value;
}
VectorTileFeature::VectorTileFeature(protozero::pbf_reader feature_pbf, std::shared_ptr<VectorTileLayerData> layerData_)
: layerData(std::move(layerData_)) {
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 = layerData->keysMap.find(key);
if (keyIter == layerData->keysMap.end()) {
return optional<Value>();
}
auto start_itr = tags_iter.begin();
const auto & end_itr = tags_iter.end();
while (start_itr != end_itr) {
auto tag_key = static_cast<uint32_t>(*start_itr++);
if (layerData->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");
}
auto tag_val = static_cast<uint32_t>(*start_itr++);;
if (layerData->values.size() <= tag_val) {
throw std::runtime_error("feature referenced out of range value");
}
if (tag_key == keyIter->second) {
return layerData->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.begin();
const auto & end_itr = tags_iter.end();
while (start_itr != end_itr) {
auto tag_key = static_cast<uint32_t>(*start_itr++);
if (start_itr == end_itr) {
throw std::runtime_error("uneven number of feature tag ids");
}
auto tag_val = static_cast<uint32_t>(*start_itr++);
properties[layerData->keys.at(tag_key)] = layerData->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) / layerData->extent;
GeometryCollection lines;
lines.emplace_back();
GeometryCoordinates* line = &lines.back();
auto g_itr = geometry_iter.begin();
while (g_itr != geometry_iter.end()) {
if (length == 0) {
auto cmd_length = static_cast<uint32_t>(*g_itr++);
cmd = cmd_length & 0x7;
length = cmd_length >> 3;
}
--length;
if (cmd == 1 || cmd == 2) {
x += protozero::decode_zigzag32(static_cast<uint32_t>(*g_itr++));
y += protozero::decode_zigzag32(static_cast<uint32_t>(*g_itr++));
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 (layerData->version >= 2 || type != FeatureType::Polygon) {
return lines;
}
return fixupPolygons(lines);
}
VectorTileData::VectorTileData(std::shared_ptr<const std::string> data_)
: data(std::move(data_)) {
}
const GeometryTileLayer* VectorTileData::getLayer(const std::string& name) const {
if (!parsed) {
parse();
}
auto it = layers.find(name);
if (it != layers.end()) {
return &it->second;
}
return nullptr;
}
std::vector<std::string> VectorTileData::layerNames() const {
if (!parsed) {
parse();
}
std::vector<std::string> names;
names.reserve(layers.size());
for (auto const& layer : layers) {
names.emplace_back(layer.first);
}
return names;
}
void VectorTileData::parse() const {
parsed = true;
layers.clear();
protozero::pbf_reader tile_pbf(*data);
while (tile_pbf.next(3)) {
VectorTileLayer layer(tile_pbf.get_message(), data);
layers.emplace(layer.name, std::move(layer));
}
}
VectorTileLayerData::VectorTileLayerData(std::shared_ptr<const std::string> pbfData) :
data(std::move(pbfData))
{}
VectorTileLayer::VectorTileLayer(protozero::pbf_reader layer_pbf, std::shared_ptr<const std::string> pbfData)
: data(std::make_shared<VectorTileLayerData>(std::move(pbfData)))
{
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 = data->keysMap.emplace(layer_pbf.get_string(), data->keysMap.size());
data->keys.emplace_back(std::reference_wrapper<const std::string>(iter.first->first));
}
break;
case 4: // values
data->values.emplace_back(parseValue(layer_pbf.get_message()));
break;
case 5: // extent
data->extent = layer_pbf.get_uint32();
break;
case 15: // version
data->version = layer_pbf.get_uint32();
break;
default:
layer_pbf.skip();
break;
}
}
}
std::unique_ptr<GeometryTileFeature> VectorTileLayer::getFeature(std::size_t i) const {
return std::make_unique<VectorTileFeature>(features.at(i), data);
}
std::string VectorTileLayer::getName() const {
return name;
}
} // namespace mbgl
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