189 lines
7.4 KiB
C++
189 lines
7.4 KiB
C++
#include <llmr/map/tile_parser.hpp>
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#include <llmr/style/style.hpp>
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#include <llmr/renderer/fill_bucket.hpp>
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#include <llmr/renderer/line_bucket.hpp>
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#include <llmr/renderer/point_bucket.hpp>
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#include <llmr/renderer/text_bucket.hpp>
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#include <llmr/renderer/raster_bucket.hpp>
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#include <llmr/util/raster.hpp>
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#include <llmr/geometry/glyph_atlas.hpp>
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#include <llmr/util/std.hpp>
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using namespace llmr;
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TileParser::TileParser(const std::string& data, TileData& tile, const Style& style, GlyphAtlas& glyphAtlas, bool is_raster)
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: vector_data(is_raster ? pbf(0, 0) : pbf((const uint8_t *)data.data(), data.size())),
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raster_data(is_raster ? data : ""),
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tile(tile),
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style(style),
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glyphAtlas(glyphAtlas),
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placement(is_raster ? 0 : tile.id.z) {
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if (!is_raster) parseGlyphs();
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parseStyleLayers(style.layers);
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}
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bool TileParser::obsolete() const {
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return tile.state == TileData::State::obsolete;
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}
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void TileParser::parseGlyphs() {
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for (const std::pair<std::string, const VectorTileFace> pair : vector_data.faces) {
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const std::string &name = pair.first;
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const VectorTileFace &face = pair.second;
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GlyphPositions &glyphs = faces[name];
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for (const VectorTileGlyph &glyph : face.glyphs) {
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const Rect<uint16_t> rect =
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glyphAtlas.addGlyph((uint64_t)tile.id, name, glyph);
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glyphs.emplace(glyph.id, Glyph{rect, glyph.metrics});
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}
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}
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}
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void TileParser::parseStyleLayers(const std::vector<LayerDescription>& layers) {
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for (const LayerDescription& layer_desc : layers) {
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// Cancel early when parsing.
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if (obsolete()) {
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return;
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}
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if (layer_desc.child_layer.size()) {
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// This is a layer group.
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// TODO: create framebuffer
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parseStyleLayers(layer_desc.child_layer);
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// TODO: render framebuffer on previous framebuffer
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} else {
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// This is a singular layer. Check if this bucket already exists. If not,
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// parse this bucket.
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auto bucket_it = tile.buckets.find(layer_desc.bucket_name);
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if (bucket_it == tile.buckets.end()) {
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auto bucket_it = style.buckets.find(layer_desc.bucket_name);
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if (bucket_it != style.buckets.end()) {
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// Only create the new bucket if we have an actual specification
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// for it.
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std::unique_ptr<Bucket> bucket = createBucket(bucket_it->second);
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if (bucket) {
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// Bucket creation might fail because the data tile may not
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// contain any data that falls into this bucket.
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tile.buckets[layer_desc.bucket_name] = std::move(bucket);
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}
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} else {
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// There is no proper specification for this bucket, even though
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// it is referenced in the stylesheet.
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fprintf(stderr, "Stylesheet specifies bucket %s, but it is not defined\n", layer_desc.bucket_name.c_str());
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}
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}
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}
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}
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}
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std::unique_ptr<Bucket> TileParser::createBucket(const BucketDescription& bucket_desc) {
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if (bucket_desc.type == BucketType::Raster) {
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if (raster_data.length()) {
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tile.raster = std::make_shared<Raster>();
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tile.raster->setData(raster_data);
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tile.raster->load();
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}
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return createRasterBucket(bucket_desc);
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} else {
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auto layer_it = vector_data.layers.find(bucket_desc.source_layer);
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if (layer_it != vector_data.layers.end()) {
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const VectorTileLayer& layer = layer_it->second;
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if (bucket_desc.type == BucketType::Fill) {
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return createFillBucket(layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Line) {
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return createLineBucket(layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Point) {
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return createPointBucket(layer, bucket_desc);
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} else if (bucket_desc.type == BucketType::Text) {
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return createTextBucket(layer, bucket_desc);
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} else {
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throw std::runtime_error("unknown bucket type");
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}
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} else {
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// The layer specified in the bucket does not exist. Do nothing.
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}
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}
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return nullptr;
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}
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template <class Bucket>
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void TileParser::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
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for (pbf feature : filtered_layer) {
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if (obsolete()) return;
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while (feature.next(4)) { // geometry
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pbf geometry_pbf = feature.message();
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if (geometry_pbf) {
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bucket->addGeometry(geometry_pbf);
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}
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}
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}
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}
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std::unique_ptr<Bucket> TileParser::createFillBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::unique_ptr<FillBucket> bucket = std::make_unique<FillBucket>(
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tile.fillVertexBuffer, tile.triangleElementsBuffer, tile.lineElementsBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return obsolete() ? nullptr : std::move(bucket);
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}
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std::unique_ptr<Bucket> TileParser::createLineBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::unique_ptr<LineBucket> bucket = std::make_unique<LineBucket>(
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tile.lineVertexBuffer, tile.triangleElementsBuffer, tile.pointElementsBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return obsolete() ? nullptr : std::move(bucket);
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}
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std::unique_ptr<Bucket> TileParser::createPointBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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std::unique_ptr<PointBucket> bucket = std::make_unique<PointBucket>(
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tile.pointVertexBuffer, bucket_desc);
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addBucketFeatures(bucket, layer, bucket_desc);
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return obsolete() ? nullptr : std::move(bucket);
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}
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std::unique_ptr<Bucket> TileParser::createTextBucket(const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
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// Determine the correct text stack.
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if (!layer.shaping.size()) {
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return nullptr;
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}
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// TODO: currently hardcoded to use the first font stack.
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const std::map<Value, Shaping>& shaping = layer.shaping.begin()->second;
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const Faces& const_faces = faces;
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IndexedFaces faces;
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for (const std::string& face : layer.faces) {
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auto it = const_faces.find(face);
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if (it == const_faces.end()) {
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// This layer references an unknown face.
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return nullptr;
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}
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faces.push_back(&it->second);
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}
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std::unique_ptr<TextBucket> bucket = std::make_unique<TextBucket>(
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tile.textVertexBuffer, tile.triangleElementsBuffer, bucket_desc, placement);
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FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
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for (const pbf& feature_pbf : filtered_layer) {
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if (obsolete()) return nullptr;
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bucket->addFeature({ feature_pbf, layer }, faces, shaping);
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}
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return std::move(bucket);
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}
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std::unique_ptr<Bucket> TileParser::createRasterBucket(const BucketDescription& bucket_desc) {
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std::unique_ptr<RasterBucket> bucket = std::make_unique<RasterBucket>(bucket_desc);
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// Raster buckets are just empty dummies so that they behave
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// similarly to vector buckets in styling configurations.
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return obsolete() ? nullptr : std::move(bucket);
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}
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