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#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/renderer/render_layer.hpp>
#include <mbgl/renderer/query.hpp>
#include <mbgl/renderer/layers/render_symbol_layer.hpp>
#include <mbgl/text/collision_index.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/math/minmax.hpp>
#include <mbgl/style/filter.hpp>
#include <mbgl/style/filter_evaluator.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mapbox/geometry/envelope.hpp>
#include <cassert>
#include <string>
namespace mbgl {
FeatureIndex::FeatureIndex(std::unique_ptr<const GeometryTileData> tileData_)
: grid(util::EXTENT, util::EXTENT, util::EXTENT / 16) // 16x16 grid -> 32px cell
, tileData(std::move(tileData_)) {
}
void FeatureIndex::insert(const GeometryCollection& geometries,
std::size_t index,
const std::string& sourceLayerName,
const std::string& bucketLeaderID) {
for (const auto& ring : geometries) {
auto envelope = mapbox::geometry::envelope(ring);
if (envelope.min.x < util::EXTENT &&
envelope.min.y < util::EXTENT &&
envelope.max.x >= 0 &&
envelope.max.y >= 0) {
grid.insert(IndexedSubfeature(index, sourceLayerName, bucketLeaderID, sortIndex++),
{convertPoint<float>(envelope.min), convertPoint<float>(envelope.max)});
}
}
}
void FeatureIndex::query(
std::unordered_map<std::string, std::vector<Feature>>& result,
const GeometryCoordinates& queryGeometry,
const TransformState& transformState,
const mat4& posMatrix,
const double tileSize,
const double scale,
const RenderedQueryOptions& queryOptions,
const UnwrappedTileID& tileID,
const std::vector<const RenderLayer*>& layers,
const float additionalQueryPadding) const {
if (!tileData) {
return;
}
// Determine query radius
const float pixelsToTileUnits = util::EXTENT / tileSize / scale;
const int16_t additionalPadding = std::min<int16_t>(util::EXTENT, additionalQueryPadding * pixelsToTileUnits);
// Query the grid index
mapbox::geometry::box<int16_t> box = mapbox::geometry::envelope(queryGeometry);
std::vector<IndexedSubfeature> features = grid.query({ convertPoint<float>(box.min - additionalPadding),
convertPoint<float>(box.max + additionalPadding) });
std::sort(features.begin(), features.end(), [](const IndexedSubfeature& a, const IndexedSubfeature& b) {
return a.sortIndex > b.sortIndex;
});
size_t previousSortIndex = std::numeric_limits<size_t>::max();
for (const auto& indexedFeature : features) {
// If this feature is the same as the previous feature, skip it.
if (indexedFeature.sortIndex == previousSortIndex) continue;
previousSortIndex = indexedFeature.sortIndex;
addFeature(result, indexedFeature, queryOptions, tileID.canonical, layers, queryGeometry, transformState, pixelsToTileUnits, posMatrix);
}
}
std::unordered_map<std::string, std::vector<Feature>> FeatureIndex::lookupSymbolFeatures(const std::vector<IndexedSubfeature>& symbolFeatures,
const RenderedQueryOptions& queryOptions,
const std::vector<const RenderLayer*>& layers,
const OverscaledTileID& tileID,
const std::shared_ptr<std::vector<size_t>>& featureSortOrder) const {
std::unordered_map<std::string, std::vector<Feature>> result;
if (!tileData) {
return result;
}
std::vector<IndexedSubfeature> sortedFeatures(symbolFeatures.begin(), symbolFeatures.end());
std::sort(sortedFeatures.begin(), sortedFeatures.end(), [featureSortOrder](const IndexedSubfeature& a, const IndexedSubfeature& b) {
// Same idea as the non-symbol sort order, but symbol features may have changed their sort order
// since their corresponding IndexedSubfeature was added to the CollisionIndex
// The 'featureSortOrder' is relatively inefficient for querying but cheap to build on every bucket sort
if (featureSortOrder) {
// queryRenderedSymbols documentation says we'll return features in
// "top-to-bottom" rendering order (aka last-to-first).
// Actually there can be multiple symbol instances per feature, so
// we sort each feature based on the first matching symbol instance.
auto sortedA = std::find(featureSortOrder->begin(), featureSortOrder->end(), a.index);
auto sortedB = std::find(featureSortOrder->begin(), featureSortOrder->end(), b.index);
assert(sortedA != featureSortOrder->end());
assert(sortedB != featureSortOrder->end());
return sortedA > sortedB;
} else {
// Bucket hasn't been re-sorted based on angle, so use same "reverse of appearance in source data"
// logic as non-symboles
return a.sortIndex > b.sortIndex;
}
});
for (const auto& symbolFeature : sortedFeatures) {
mat4 unusedMatrix;
addFeature(result, symbolFeature, queryOptions, tileID.canonical, layers, GeometryCoordinates(), {}, 0, unusedMatrix);
}
return result;
}
void FeatureIndex::addFeature(
std::unordered_map<std::string, std::vector<Feature>>& result,
const IndexedSubfeature& indexedFeature,
const RenderedQueryOptions& options,
const CanonicalTileID& tileID,
const std::vector<const RenderLayer*>& layers,
const GeometryCoordinates& queryGeometry,
const TransformState& transformState,
const float pixelsToTileUnits,
const mat4& posMatrix) const {
auto getRenderLayer = [&] (const std::string& layerID) -> const RenderLayer* {
for (const auto& layer : layers) {
if (layer->getID() == layerID) {
return layer;
}
}
return nullptr;
};
// Lazily calculated.
std::unique_ptr<GeometryTileLayer> sourceLayer;
std::unique_ptr<GeometryTileFeature> geometryTileFeature;
for (const std::string& layerID : bucketLayerIDs.at(indexedFeature.bucketLeaderID)) {
const RenderLayer* renderLayer = getRenderLayer(layerID);
if (!renderLayer) {
continue;
}
if (!geometryTileFeature) {
sourceLayer = tileData->getLayer(indexedFeature.sourceLayerName);
assert(sourceLayer);
geometryTileFeature = sourceLayer->getFeature(indexedFeature.index);
assert(geometryTileFeature);
}
if (!renderLayer->is<RenderSymbolLayer>() &&
!renderLayer->queryIntersectsFeature(queryGeometry, *geometryTileFeature, tileID.z, transformState, pixelsToTileUnits, posMatrix)) {
continue;
}
if (options.filter && !(*options.filter)(style::expression::EvaluationContext { static_cast<float>(tileID.z), geometryTileFeature.get() })) {
continue;
}
result[layerID].push_back(convertFeature(*geometryTileFeature, tileID));
}
}
optional<GeometryCoordinates> FeatureIndex::translateQueryGeometry(
const GeometryCoordinates& queryGeometry,
const std::array<float, 2>& translate,
const style::TranslateAnchorType anchorType,
const float bearing,
const float pixelsToTileUnits) {
if (translate[0] == 0 && translate[1] == 0) {
return {};
}
GeometryCoordinate translateVec(translate[0] * pixelsToTileUnits, translate[1] * pixelsToTileUnits);
if (anchorType == style::TranslateAnchorType::Viewport) {
translateVec = util::rotate(translateVec, -bearing);
}
GeometryCoordinates translated;
for (const auto& p : queryGeometry) {
translated.push_back(p - translateVec);
}
return translated;
}
void FeatureIndex::setBucketLayerIDs(const std::string& bucketLeaderID, const std::vector<std::string>& layerIDs) {
bucketLayerIDs[bucketLeaderID] = layerIDs;
}
} // namespace mbgl
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