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#include <llmr/map/tile_parser.hpp>
#include <llmr/map/vector_tile_data.hpp>
#include <llmr/style/style.hpp>
#include <llmr/style/style_layer.hpp>
#include <llmr/renderer/fill_bucket.hpp>
#include <llmr/renderer/line_bucket.hpp>
#include <llmr/renderer/icon_bucket.hpp>
#include <llmr/renderer/text_bucket.hpp>
#include <llmr/renderer/raster_bucket.hpp>
#include <llmr/util/raster.hpp>
#include <llmr/util/constants.hpp>
#include <llmr/util/token.hpp>
#include <llmr/geometry/glyph_atlas.hpp>
#include <llmr/text/glyph_store.hpp>
#include <llmr/text/glyph.hpp>
#include <llmr/util/std.hpp>
#include <llmr/util/utf.hpp>
#ifdef __linux__
#include <boost/regex.hpp>
namespace regex_impl = boost;
#else
#include <regex>
namespace regex_impl = std;
#endif
using namespace llmr;
TileParser::TileParser(const std::string &data, VectorTileData &tile,
const std::shared_ptr<const Style> &style,
const std::shared_ptr<GlyphAtlas> &glyphAtlas,
const std::shared_ptr<GlyphStore> &glyphStore,
const std::shared_ptr<SpriteAtlas> &spriteAtlas)
: vector_data(pbf((const uint8_t *)data.data(), data.size())),
tile(tile),
style(style),
glyphAtlas(glyphAtlas),
glyphStore(glyphStore),
spriteAtlas(spriteAtlas),
placement(tile.id.z) {
}
void TileParser::parse() {
parseStyleLayers(style->layers);
}
bool TileParser::obsolete() const { return tile.state == TileData::State::obsolete; }
void TileParser::addGlyph(uint64_t tileid, const std::string stackname,
const std::u32string &string, const FontStack &fontStack,
GlyphAtlas &glyphAtlas, GlyphPositions &face) {
const std::map<uint32_t, SDFGlyph> &sdfs = fontStack.getSDFs();
// Loop through all characters and add glyph to atlas, positions.
for (uint32_t chr : string) {
auto sdf_it = sdfs.find(chr);
if (sdf_it != sdfs.end()) {
const SDFGlyph& sdf = sdf_it->second;
const Rect<uint16_t> rect = glyphAtlas.addGlyph(tileid, stackname, sdf);
face.emplace(chr, Glyph{rect, sdf.metrics});
}
}
}
void TileParser::parseStyleLayers(std::shared_ptr<StyleLayerGroup> layers) {
if (!layers) {
return;
}
for (const std::shared_ptr<StyleLayer> &layer_desc : *layers) {
// Cancel early when parsing.
if (obsolete()) {
return;
}
if (layer_desc->id == "background") {
// background is a special, fake bucket
continue;
} else if (layer_desc->layers) {
// This is a layer group.
parseStyleLayers(layer_desc->layers);
} else if (layer_desc->bucket) {
// This is a singular layer. Check if this bucket already exists. If not,
// parse this bucket.
auto bucket_it = tile.buckets.find(layer_desc->bucket->name);
if (bucket_it == tile.buckets.end()) {
// We need to create this bucket since it doesn't exist yet.
std::unique_ptr<Bucket> bucket = createBucket(layer_desc->bucket);
if (bucket) {
// Bucket creation might fail because the data tile may not
// contain any data that falls into this bucket.
tile.buckets[layer_desc->bucket->name] = std::move(bucket);
}
}
} else {
fprintf(stderr, "[WARNING] layer does not have child layers or buckets\n");
}
}
}
std::unique_ptr<Bucket> TileParser::createBucket(std::shared_ptr<StyleBucket> bucket_desc) {
if (!bucket_desc) {
fprintf(stderr, "missing bucket desc\n");
return nullptr;
}
auto layer_it = vector_data.layers.find(bucket_desc->source_layer);
if (layer_it != vector_data.layers.end()) {
const VectorTileLayer &layer = layer_it->second;
if (bucket_desc->render.is<StyleBucketFill>()) {
return createFillBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketFill>());
} else if (bucket_desc->render.is<StyleBucketLine>()) {
return createLineBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketLine>());
} else if (bucket_desc->render.is<StyleBucketIcon>()) {
return createIconBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketIcon>());
} else if (bucket_desc->render.is<StyleBucketText>()) {
return createTextBucket(layer, bucket_desc->filter, bucket_desc->render.get<StyleBucketText>());
} else if (bucket_desc->render.is<StyleBucketRaster>()) {
return nullptr;
} else {
fprintf(stderr, "[WARNING] unknown bucket render type for layer '%s'\n", bucket_desc->source_layer.c_str());
}
} else {
// The layer specified in the bucket does not exist. Do nothing.
if (debug::tileParseWarnings) {
fprintf(stderr, "[WARNING] layer '%s' does not exist in tile %d/%d/%d\n",
bucket_desc->source_layer.c_str(), tile.id.z, tile.id.x, tile.id.y);
}
}
return nullptr;
}
template <class Bucket>
void TileParser::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const FilterExpression &filter) {
FilteredVectorTileLayer filtered_layer(layer, filter);
for (pbf feature : filtered_layer) {
if (obsolete())
return;
while (feature.next(4)) { // geometry
pbf geometry_pbf = feature.message();
if (geometry_pbf) {
bucket->addGeometry(geometry_pbf);
} else if (debug::tileParseWarnings) {
fprintf(stderr, "[WARNING] geometry is empty\n");
}
}
}
}
template <class Bucket, typename... Args>
void TileParser::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const FilterExpression &filter, Args&& ...args) {
FilteredVectorTileLayer filtered_layer(layer, filter);
for (const pbf &feature_pbf : filtered_layer) {
if (obsolete()) {
return;
}
bucket->addFeature({feature_pbf, layer}, std::forward<Args>(args)...);
}
}
std::unique_ptr<Bucket> TileParser::createFillBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketFill &fill) {
std::unique_ptr<FillBucket> bucket = std::make_unique<FillBucket>(tile.fillVertexBuffer, tile.triangleElementsBuffer, tile.lineElementsBuffer, fill);
addBucketFeatures(bucket, layer, filter);
return obsolete() ? nullptr : std::move(bucket);
}
std::unique_ptr<Bucket> TileParser::createLineBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketLine &line) {
std::unique_ptr<LineBucket> bucket = std::make_unique<LineBucket>(tile.lineVertexBuffer, tile.triangleElementsBuffer, tile.pointElementsBuffer, line);
addBucketFeatures(bucket, layer, filter);
return obsolete() ? nullptr : std::move(bucket);
}
std::unique_ptr<Bucket> TileParser::createIconBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketIcon &icon) {
std::unique_ptr<IconBucket> bucket = std::make_unique<IconBucket>(tile.iconVertexBuffer, icon);
addBucketFeatures(bucket, layer, filter, *spriteAtlas);
return obsolete() ? nullptr : std::move(bucket);
}
std::unique_ptr<Bucket> TileParser::createTextBucket(const VectorTileLayer& layer, const FilterExpression &filter, const StyleBucketText &text) {
const StyleBucketText &properties = text;
std::unique_ptr<TextBucket> bucket = std::make_unique<TextBucket>(
tile.textVertexBuffer, tile.triangleElementsBuffer, properties, placement);
util::utf8_to_utf32 ucs4conv;
std::vector<std::pair<std::u32string, pbf>> labels;
// Determine and load glyph ranges
{
std::set<GlyphRange> ranges;
FilteredVectorTileLayer filtered_layer(layer, filter);
for (const pbf &feature_pbf : filtered_layer) {
if (obsolete())
return nullptr;
VectorTileFeature feature{feature_pbf, layer};
const std::u32string string = ucs4conv.convert(
util::replaceTokens(properties.field, feature.properties));
// Loop through all characters of this text and collect unique codepoints.
for (char32_t chr : string) {
ranges.insert(getGlyphRange(chr));
}
labels.emplace_back(string, feature.geometry);
}
glyphStore->waitForGlyphRanges(properties.font, ranges);
}
// Create a copy!
const FontStack &fontStack = glyphStore->getFontStack(properties.font);
GlyphPositions face;
// Shape and place all labels.
for (const std::pair<std::u32string, pbf> &label : labels) {
// Shape labels.
const Shaping shaping = fontStack.getShaping(label.first, properties.max_width,
properties.line_height, properties.alignment,
properties.vertical_alignment, properties.letter_spacing);
// Place labels.
addGlyph(tile.id.to_uint64(), properties.font, label.first, fontStack, *glyphAtlas,
face);
bucket->addFeature(label.second, face, shaping);
}
return std::move(bucket);
}
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