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move tile parsing to its own object

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This commit is contained in:
Konstantin Käfer
2014-03-12 17:47:40 +01:00
parent be44b6b31f
commit 99cef810ac
4 changed files with 204 additions and 174 deletions
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162
src/map/tile_data.cpp
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@@ -1,22 +1,13 @@
#include <llmr/map/tile_data.hpp>
#include <llmr/map/tile_parser.hpp>
#include <llmr/style/style.hpp>
#include <llmr/map/vector_tile.hpp>
#include <llmr/geometry/fill_buffer.hpp>
#include <llmr/geometry/line_buffer.hpp>
#include <llmr/geometry/point_buffer.hpp>
#include <llmr/geometry/text_buffer.hpp>
#include <llmr/geometry/elements_buffer.hpp>
#include <llmr/renderer/fill_bucket.hpp>
#include <llmr/renderer/line_bucket.hpp>
#include <llmr/renderer/point_bucket.hpp>
#include <llmr/renderer/text_bucket.hpp>
#include <llmr/util/pbf.hpp>
#include <llmr/util/string.hpp>
#include <chrono>
#include <iostream>
using namespace llmr;
TileData::TileData(Tile::ID id, const Style& style, GlyphAtlas& glyphAtlas)
@@ -86,16 +77,10 @@ bool TileData::parse() {
}
try {
double parse_time_start = platform::time();
VectorTile tile(pbf((const uint8_t *)data.data(), data.size()));
loadGlyphs(tile.faces);
parseStyleLayers(tile, style.layers);
// double parse_time = (platform::time() - parse_time_start) * 1000.0;
if (state == State::obsolete) {
// fprintf(stderr, "[%p] parsing [%d/%d/%d] cancelled after %8.3fms\n", this, id.z, id.x, id.y, parse_time);
} else {
// fprintf(stderr, "[%p] parsing [%d/%d/%d] took %8.3fms\n", this, id.z, id.x, id.y, parse_time);
}
// Parsing creates state that is encapsulated in TileParser. While parsing,
// the TileParser object writes results into this objects. All other state
// is going to be discarded afterwards.
TileParser parser(data, *this, style, glyphAtlas);
} catch (const std::exception& ex) {
fprintf(stderr, "[%p] exception [%d/%d/%d]... failed: %s\n", this, id.z, id.x, id.y, ex.what());
cancel();
@@ -110,140 +95,3 @@ bool TileData::parse() {
return true;
}
void TileData::loadGlyphs(const std::map<std::string, const VectorTileFace>& faces) {
std::map<std::string, std::map<uint32_t, Rect<uint16_t>>> rects;
for (const std::pair<std::string, const VectorTileFace> pair : faces) {
const std::string& name = pair.first;
const VectorTileFace& face = pair.second;
std::map<uint32_t, Rect<uint16_t>>& rect = rects[name];
for (const VectorTileGlyph& glyph : face.glyphs) {
rect.emplace({ glyph.id, glyphAtlas.addGlyph((uint64_t)id, name, glyph) });
}
}
}
void TileData::parseStyleLayers(const VectorTile& tile, const std::vector<LayerDescription>& layers) {
for (const LayerDescription& layer_desc : layers) {
// Cancel early when parsing.
if (state == State::obsolete) {
return;
}
if (layer_desc.child_layer.size()) {
// This is a layer group.
// TODO: create framebuffer
parseStyleLayers(tile, layer_desc.child_layer);
// TODO: render framebuffer on previous framebuffer
} else {
// This is a singular layer. Check if this bucket already exists. If not,
// parse this bucket.
auto bucket_it = buckets.find(layer_desc.bucket_name);
if (bucket_it == buckets.end()) {
auto bucket_it = style.buckets.find(layer_desc.bucket_name);
if (bucket_it != style.buckets.end()) {
// Only create the new bucket if we have an actual specification
// for it.
std::shared_ptr<Bucket> bucket = createBucket(tile, bucket_it->second);
if (bucket) {
// Bucket creation might fail because the data tile may not
// contain any data that falls into this bucket.
buckets[layer_desc.bucket_name] = bucket;
}
} else {
// There is no proper specification for this bucket, even though
// it is referenced in the stylesheet.
fprintf(stderr, "Stylesheet specifies bucket %s, but it is not defined\n", layer_desc.bucket_name.c_str());
}
}
}
}
}
std::shared_ptr<Bucket> TileData::createBucket(const VectorTile& tile, const BucketDescription& bucket_desc) {
auto layer_it = tile.layers.find(bucket_desc.source_layer);
if (layer_it != tile.layers.end()) {
const VectorTileLayer& layer = layer_it->second;
if (bucket_desc.type == BucketType::Fill) {
return createFillBucket(tile, layer, bucket_desc);
} else if (bucket_desc.type == BucketType::Line) {
return createLineBucket(tile, layer, bucket_desc);
} else if (bucket_desc.type == BucketType::Point) {
return createPointBucket(tile, layer, bucket_desc);
} else if (bucket_desc.type == BucketType::Text) {
return createTextBucket(tile, layer, bucket_desc);
} else {
throw std::runtime_error("unknown bucket type");
}
} else {
// The layer specified in the bucket does not exist. Do nothing.
}
return nullptr;
}
template <class Bucket>
void TileData::addBucketFeatures(Bucket& bucket, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
for (pbf feature : filtered_layer) {
if (state == State::obsolete) return;
while (feature.next(4)) { // geometry
pbf geometry_pbf = feature.message();
if (geometry_pbf) {
bucket->addGeometry(geometry_pbf);
}
}
}
}
std::shared_ptr<Bucket> TileData::createFillBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
std::shared_ptr<FillBucket> bucket = std::make_shared<FillBucket>(fillVertexBuffer, triangleElementsBuffer, lineElementsBuffer, bucket_desc);
addBucketFeatures(bucket, layer, bucket_desc);
return state == State::obsolete ? nullptr : bucket;
}
std::shared_ptr<Bucket> TileData::createLineBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
std::shared_ptr<LineBucket> bucket = std::make_shared<LineBucket>(lineVertexBuffer, triangleElementsBuffer, pointElementsBuffer, bucket_desc);
addBucketFeatures(bucket, layer, bucket_desc);
return state == State::obsolete ? nullptr : bucket;
}
std::shared_ptr<Bucket> TileData::createPointBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
std::shared_ptr<PointBucket> bucket = std::make_shared<PointBucket>(pointVertexBuffer, bucket_desc);
addBucketFeatures(bucket, layer, bucket_desc);
return state == State::obsolete ? nullptr : bucket;
}
std::shared_ptr<Bucket> TileData::createTextBucket(const VectorTile& tile, const VectorTileLayer& layer, const BucketDescription& bucket_desc) {
// Determine the correct text stack.
if (!layer.shaping.size()) {
return nullptr;
}
// TODO: currently hardcoded to use the first font stack.
const std::map<Value, std::vector<VectorTilePlacement>>& shaping = layer.shaping.begin()->second;
std::vector<const VectorTileFace *> faces;
for (const std::string& face : layer.faces) {
auto it = tile.faces.find(face);
if (it == tile.faces.end()) {
// This layer references an unknown face.
return nullptr;
}
faces.push_back(&it->second);
}
std::shared_ptr<TextBucket> bucket = std::make_shared<TextBucket>(textVertexBuffer, triangleElementsBuffer, bucket_desc);
FilteredVectorTileLayer filtered_layer(layer, bucket_desc);
for (const pbf& feature_pbf : filtered_layer) {
if (state == State::obsolete) return nullptr;
bucket->addFeature({ feature_pbf, layer }, faces, shaping);
}
return bucket;
}