240 lines
9.2 KiB
C++
240 lines
9.2 KiB
C++
#include <llmr/map/tile_parser.hpp>
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#include <llmr/map/vector_tile_data.hpp>
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#include <llmr/style/style.hpp>
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#include <llmr/style/style_layer.hpp>
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#include <llmr/style/style_layer_group.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/icon_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/util/constants.hpp>
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#include <llmr/util/token.hpp>
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#include <llmr/geometry/glyph_atlas.hpp>
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#include <llmr/text/glyph_store.hpp>
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#include <llmr/text/glyph.hpp>
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#include <llmr/util/std.hpp>
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#include <llmr/util/utf.hpp>
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#ifdef __linux__
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#include <boost/regex.hpp>
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namespace regex_impl = boost;
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#else
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#include <regex>
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namespace regex_impl = std;
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#endif
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using namespace llmr;
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TileParser::TileParser(const std::string &data, VectorTileData &tile,
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const std::shared_ptr<const Style> &style,
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const std::shared_ptr<GlyphAtlas> &glyphAtlas,
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const std::shared_ptr<GlyphStore> &glyphStore,
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const std::shared_ptr<SpriteAtlas> &spriteAtlas)
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: vector_data(pbf((const uint8_t *)data.data(), data.size())),
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tile(tile),
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style(style),
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glyphAtlas(glyphAtlas),
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glyphStore(glyphStore),
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spriteAtlas(spriteAtlas),
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placement(tile.id.z) {
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}
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void TileParser::parse() {
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parseStyleLayers(style->layers);
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}
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bool TileParser::obsolete() const { return tile.state == TileData::State::obsolete; }
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void TileParser::addGlyph(uint64_t tileid, const std::string stackname,
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const std::u32string &string, const FontStack &fontStack,
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GlyphAtlas &glyphAtlas, GlyphPositions &face) {
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const std::map<uint32_t, SDFGlyph> &sdfs = fontStack.getSDFs();
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// Loop through all characters and add glyph to atlas, positions.
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for (uint32_t chr : string) {
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auto sdf_it = sdfs.find(chr);
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if (sdf_it != sdfs.end()) {
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const SDFGlyph& sdf = sdf_it->second;
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const Rect<uint16_t> rect = glyphAtlas.addGlyph(tileid, stackname, sdf);
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face.emplace(chr, Glyph{rect, sdf.metrics});
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}
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}
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}
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void TileParser::parseStyleLayers(std::shared_ptr<StyleLayerGroup> group) {
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if (!group) {
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return;
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}
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for (const std::shared_ptr<StyleLayer> &layer_desc : group->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->isBackground()) {
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// background is a special, fake bucket
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continue;
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} else if (layer_desc->layers) {
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// This is a layer group.
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parseStyleLayers(layer_desc->layers);
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} else if (layer_desc->bucket) {
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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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// We need to create this bucket since it doesn't exist yet.
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std::unique_ptr<Bucket> bucket = createBucket(layer_desc->bucket);
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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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}
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} else {
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fprintf(stderr, "[WARNING] layer does not have child layers or buckets\n");
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}
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}
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}
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std::unique_ptr<Bucket> TileParser::createBucket(std::shared_ptr<StyleBucket> bucket_desc) {
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if (!bucket_desc) {
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fprintf(stderr, "missing bucket desc\n");
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return nullptr;
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}
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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->render.is<StyleBucketFill>()) {
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return createFillBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketFill>());
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} else if (bucket_desc->render.is<StyleBucketLine>()) {
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return createLineBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketLine>());
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} else if (bucket_desc->render.is<StyleBucketIcon>()) {
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return createIconBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketIcon>());
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} else if (bucket_desc->render.is<StyleBucketText>()) {
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return createTextBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketText>());
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} else if (bucket_desc->render.is<StyleBucketRaster>()) {
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return nullptr;
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} else {
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fprintf(stderr, "[WARNING] unknown bucket render type for layer '%s'\n", bucket_desc->source_layer.c_str());
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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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if (debug::tileParseWarnings) {
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fprintf(stderr, "[WARNING] layer '%s' does not exist in tile %d/%d/%d\n",
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bucket_desc->source_layer.c_str(), tile.id.z, tile.id.x, tile.id.y);
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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 FilterExpression &filter) {
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FilteredVectorTileLayer filtered_layer(layer, filter);
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for (pbf feature : filtered_layer) {
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if (obsolete())
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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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} else if (debug::tileParseWarnings) {
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fprintf(stderr, "[WARNING] geometry is empty\n");
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}
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}
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}
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}
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template <class Bucket, typename... Args>
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void TileParser::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const FilterExpression &filter, Args&& ...args) {
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FilteredVectorTileLayer filtered_layer(layer, filter);
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for (const pbf &feature_pbf : filtered_layer) {
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if (obsolete()) {
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return;
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}
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bucket->addFeature({feature_pbf, layer}, std::forward<Args>(args)...);
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}
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}
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std::unique_ptr<Bucket> TileParser::createFillBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketFill &fill) {
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std::unique_ptr<FillBucket> bucket = std::make_unique<FillBucket>(tile.fillVertexBuffer, tile.triangleElementsBuffer, tile.lineElementsBuffer, fill);
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addBucketFeatures(bucket, layer, filter);
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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 FilterExpression &filter, const StyleBucketLine &line) {
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std::unique_ptr<LineBucket> bucket = std::make_unique<LineBucket>(tile.lineVertexBuffer, tile.triangleElementsBuffer, tile.pointElementsBuffer, line);
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addBucketFeatures(bucket, layer, filter);
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return obsolete() ? nullptr : std::move(bucket);
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}
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std::unique_ptr<Bucket> TileParser::createIconBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketIcon &icon) {
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std::unique_ptr<IconBucket> bucket = std::make_unique<IconBucket>(tile.iconVertexBuffer, icon);
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addBucketFeatures(bucket, layer, filter, *spriteAtlas);
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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 FilterExpression &filter, const StyleBucketText &text) {
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const StyleBucketText &properties = text;
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std::unique_ptr<TextBucket> bucket = std::make_unique<TextBucket>(
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tile.textVertexBuffer, tile.triangleElementsBuffer, properties, placement);
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util::utf8_to_utf32 ucs4conv;
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std::vector<std::pair<std::u32string, pbf>> labels;
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// Determine and load glyph ranges
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{
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std::set<GlyphRange> ranges;
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FilteredVectorTileLayer filtered_layer(layer, filter);
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for (const pbf &feature_pbf : filtered_layer) {
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if (obsolete())
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return nullptr;
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VectorTileFeature feature{feature_pbf, layer};
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const std::u32string string = ucs4conv.convert(
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util::replaceTokens(properties.field, feature.properties));
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// Loop through all characters of this text and collect unique codepoints.
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for (char32_t chr : string) {
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ranges.insert(getGlyphRange(chr));
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}
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labels.emplace_back(string, feature.geometry);
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}
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glyphStore->waitForGlyphRanges(properties.font, ranges);
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}
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// Create a copy!
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const FontStack &fontStack = glyphStore->getFontStack(properties.font);
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GlyphPositions face;
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// Shape and place all labels.
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for (const std::pair<std::u32string, pbf> &label : labels) {
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// Shape labels.
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const Shaping shaping = fontStack.getShaping(label.first, properties.max_width,
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properties.line_height, properties.alignment,
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properties.vertical_alignment, properties.letter_spacing);
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// Place labels.
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addGlyph(tile.id.to_uint64(), properties.font, label.first, fontStack, *glyphAtlas,
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face);
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bucket->addFeature(label.second, face, shaping);
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}
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return std::move(bucket);
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}
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