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#include <mbgl/text/cross_tile_symbol_index.hpp>
#include <mbgl/layout/symbol_instance.hpp>
#include <mbgl/renderer/buckets/symbol_bucket.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/tile/tile.hpp>
namespace mbgl {
TileLayerIndex::TileLayerIndex(OverscaledTileID coord_, std::vector<SymbolInstance>& symbolInstances, uint32_t bucketInstanceId_)
: coord(coord_), bucketInstanceId(bucketInstanceId_) {
for (SymbolInstance& symbolInstance : symbolInstances) {
indexedSymbolInstances[symbolInstance.key].emplace_back(symbolInstance.crossTileID, getScaledCoordinates(symbolInstance, coord));
}
}
Point<int64_t> TileLayerIndex::getScaledCoordinates(SymbolInstance& symbolInstance, const OverscaledTileID& childTileCoord) {
// Round anchor positions to roughly 4 pixel grid
const double roundingFactor = 512.0 / util::EXTENT / 2.0;
const double scale = roundingFactor / std::pow(2, childTileCoord.canonical.z - coord.canonical.z);
return {
static_cast<int64_t>(std::floor((childTileCoord.canonical.x * util::EXTENT + symbolInstance.anchor.point.x) * scale)),
static_cast<int64_t>(std::floor((childTileCoord.canonical.y * util::EXTENT + symbolInstance.anchor.point.y) * scale))
};
}
void TileLayerIndex::findMatches(std::vector<SymbolInstance>& symbolInstances, const OverscaledTileID& newCoord) {
float tolerance = coord.canonical.z < newCoord.canonical.z ? 1 : std::pow(2, coord.canonical.z - newCoord.canonical.z);
for (auto& symbolInstance : symbolInstances) {
if (symbolInstance.crossTileID) {
// already has a match, skip
continue;
}
auto it = indexedSymbolInstances.find(symbolInstance.key);
if (it == indexedSymbolInstances.end()) {
// No symbol with this key in this bucket
continue;
}
auto scaledSymbolCoord = getScaledCoordinates(symbolInstance, newCoord);
for (IndexedSymbolInstance& thisTileSymbol: it->second) {
// Return any symbol with the same keys whose coordinates are within 1
// grid unit. (with a 4px grid, this covers a 12px by 12px area)
if (std::abs(thisTileSymbol.coord.x - scaledSymbolCoord.x) <= tolerance &&
std::abs(thisTileSymbol.coord.y - scaledSymbolCoord.y) <= tolerance) {
symbolInstance.crossTileID = thisTileSymbol.crossTileID;
break;
}
}
}
}
CrossTileSymbolLayerIndex::CrossTileSymbolLayerIndex() {
}
bool CrossTileSymbolLayerIndex::addBucket(const OverscaledTileID& tileID, SymbolBucket& bucket, uint32_t& maxCrossTileID) {
auto thisZoomIndexes = indexes[tileID.overscaledZ];
auto previousIndex = thisZoomIndexes.find(tileID);
if (previousIndex != thisZoomIndexes.end() && previousIndex->second.bucketInstanceId == bucket.bucketInstanceId) {
return false;
}
for (auto& symbolInstance: bucket.symbolInstances) {
symbolInstance.crossTileID = 0;
}
for (auto& it : indexes) {
auto zoom = it.first;
auto zoomIndexes = it.second;
if (zoom > tileID.overscaledZ) {
for (auto& childIndex : zoomIndexes) {
if (childIndex.second.coord.isChildOf(tileID)) {
childIndex.second.findMatches(bucket.symbolInstances, tileID);
}
}
} else {
auto parentTileID = tileID.scaledTo(zoom);
auto parentIndex = zoomIndexes.find(parentTileID);
if (parentIndex != zoomIndexes.end()) {
parentIndex->second.findMatches(bucket.symbolInstances, tileID);
}
}
}
for (auto& symbolInstance : bucket.symbolInstances) {
if (!symbolInstance.crossTileID) {
// symbol did not match any known symbol, assign a new id
symbolInstance.crossTileID = ++maxCrossTileID;
}
}
indexes[tileID.overscaledZ].emplace(tileID, TileLayerIndex(tileID, bucket.symbolInstances, bucket.bucketInstanceId));
return true;
}
bool CrossTileSymbolLayerIndex::removeStaleBuckets(const std::unordered_set<uint32_t>& currentIDs) {
bool tilesChanged = false;
for (auto& zoomIndexes : indexes) {
for (auto it = zoomIndexes.second.begin(); it != zoomIndexes.second.end();) {
if (!currentIDs.count(it->second.bucketInstanceId)) {
it = zoomIndexes.second.erase(it);
tilesChanged = true;
} else {
++it;
}
}
}
return tilesChanged;
}
CrossTileSymbolIndex::CrossTileSymbolIndex() {}
bool CrossTileSymbolIndex::addLayer(RenderSymbolLayer& symbolLayer) {
auto& layerIndex = layerIndexes[symbolLayer.getID()];
bool symbolBucketsChanged = false;
std::unordered_set<uint32_t> currentBucketIDs;
for (RenderTile& renderTile : symbolLayer.renderTiles) {
if (!renderTile.tile.isRenderable()) {
continue;
}
auto bucket = renderTile.tile.getBucket(*symbolLayer.baseImpl);
assert(dynamic_cast<SymbolBucket*>(bucket));
SymbolBucket& symbolBucket = *reinterpret_cast<SymbolBucket*>(bucket);
if (!symbolBucket.bucketInstanceId) {
symbolBucket.bucketInstanceId = ++maxBucketInstanceId;
}
const bool bucketAdded = layerIndex.addBucket(renderTile.tile.id, symbolBucket, maxCrossTileID);
symbolBucketsChanged = symbolBucketsChanged || bucketAdded;
currentBucketIDs.insert(symbolBucket.bucketInstanceId);
}
if (layerIndex.removeStaleBuckets(currentBucketIDs)) {
symbolBucketsChanged = true;
}
return symbolBucketsChanged;
}
void CrossTileSymbolIndex::reset() {
layerIndexes.clear();
}
} // namespace mbgl
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