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#include <mbgl/tile/vector_tile_data.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/logging.hpp>
namespace mbgl {
VectorTileFeature::VectorTileFeature(const vtzero::layer& layer_,
const vtzero::feature& feature_)
: feature(feature_), layer(layer_) {
}
FeatureType VectorTileFeature::getType() const {
switch (feature.geometry_type()) {
case vtzero::GeomType::POINT:
return FeatureType::Point;
case vtzero::GeomType::LINESTRING:
return FeatureType::LineString;
case vtzero::GeomType::POLYGON:
return FeatureType::Polygon;
default:
return FeatureType::Unknown;
}
}
struct PropertyValueMapping : vtzero::property_value_mapping {
using float_type = double;
};
optional<Value> VectorTileFeature::getValue(const std::string& key) const {
optional<Value> result;
feature.for_each_property([&](vtzero::property&& p) {
if (p.key() == key) {
result = vtzero::convert_property_value<Value, PropertyValueMapping>(p.value());
}
return !result;
});
return result;
}
std::unordered_map<std::string, Value> VectorTileFeature::getProperties() const {
std::unordered_map<std::string, Value> map;
feature.for_each_property([&](const vtzero::property& p) {
map.emplace(std::string(p.key()), vtzero::convert_property_value<Value, PropertyValueMapping>(p.value()));
return true;
});
return map;
}
optional<FeatureIdentifier> VectorTileFeature::getID() const {
return {feature.id()};
}
// Decode every geometry into a common structure: GeometryCollection, aka
// std::vector<std::vector<mapbox::geometry::Point<int16_t>>>
struct GeometryHandler {
GeometryHandler(const float scale_) : scale(scale_) {}
void begin(uint32_t count) {
// cap allocation to 1MB
constexpr std::uint32_t MAX_LENGTH = (1024 * 1024) / 16;
if (count > MAX_LENGTH) {
count = MAX_LENGTH;
}
result_.emplace_back();
result_.back().reserve(count);
}
void add_point(vtzero::point point) {
float scaled_x = ::roundf(static_cast<float>(point.x) * scale);
float scaled_y = ::roundf(static_cast<float>(point.y) * scale);
static const float max_coord = static_cast<float>(std::numeric_limits<typename GeometryCollection::coordinate_type>::max());
static const float min_coord = static_cast<float>(std::numeric_limits<typename GeometryCollection::coordinate_type>::min());
if (scaled_x > max_coord ||
scaled_x < min_coord ||
scaled_y > max_coord ||
scaled_y < min_coord
) {
std::runtime_error("paths outside valid range of coordinate_type");
} else {
result_.back().emplace_back(
static_cast<typename GeometryCollection::coordinate_type>(scaled_x),
static_cast<typename GeometryCollection::coordinate_type>(scaled_y));
}
}
// decode_point_geometry handlers
void points_begin(uint32_t count) { begin(count); }
void points_point(vtzero::point point) { add_point(point); }
void points_end() {}
// decode_linestring_geometry handlers
void linestring_begin(uint32_t count) { begin(count); }
void linestring_point(vtzero::point point) { add_point(point); }
void linestring_end() {}
// decode_polygon_geometry handlers
void ring_begin(uint32_t count) { begin(count); }
void ring_point(vtzero::point point) { add_point(point); }
void ring_end(vtzero::ring_type) {}
GeometryCollection result() {
return result_;
}
const float scale;
GeometryCollection result_;
};
GeometryCollection VectorTileFeature::getGeometries() const {
const float scale = float(util::EXTENT) / layer.extent();
const vtzero::geometry geometry = feature.geometry();
try {
GeometryCollection lines = vtzero::decode_geometry(geometry, GeometryHandler(scale));
if (layer.version() >= 2 || feature.geometry_type() != vtzero::GeomType::POLYGON) {
return lines;
} else {
return fixupPolygons(lines);
}
} catch (const std::exception& e) {
Log::Warning(Event::ParseTile, std::string("vtzero: ") + e.what());
return {};
}
}
VectorTileLayer::VectorTileLayer(std::shared_ptr<const std::string> data_,
const vtzero::layer& layer_)
: data(std::move(data_)), layer(layer_) {
layer.for_each_feature([&](vtzero::feature&& f) {
features.push_back(f);
return true;
});
}
std::size_t VectorTileLayer::featureCount() const {
return layer.num_features();
}
std::unique_ptr<GeometryTileFeature> VectorTileLayer::getFeature(std::size_t i) const {
return std::make_unique<VectorTileFeature>(layer, features[i]);
}
std::string VectorTileLayer::getName() const {
return static_cast<std::string>(layer.name());
}
VectorTileData::VectorTileData(std::shared_ptr<const std::string> data_) :
data(std::move(data_)),
tile(*data)
{
}
std::unique_ptr<GeometryTileData> VectorTileData::clone() const {
return std::make_unique<VectorTileData>(data);
}
std::unique_ptr<GeometryTileLayer> VectorTileData::getLayer(const std::string& name) const {
parseLayers();
auto it = layers.find(name);
if (it != layers.end()) {
return std::make_unique<VectorTileLayer>(data, it->second);
}
return nullptr;
}
std::vector<std::string> VectorTileData::layerNames() const {
parseLayers();
std::vector<std::string> names;
names.reserve(layers.size());
for (const auto& entry : layers) {
names.emplace_back(entry.first);
}
return names;
}
void VectorTileData::parseLayers() const {
if (!parsed) {
// We're parsing this lazily so that we can construct VectorTileData objects on the main
// thread without incurring the overhead of parsing immediately.
tile.for_each_layer([&](vtzero::layer&& layer) {
layers[static_cast<std::string>(layer.name())] = std::move(layer);
return true;
});
parsed = true;
}
}
} // namespace mbgl
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