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Add MLT (MapLibre Tile) output format
Integrate the C++ MLT encoder from maplibre-tile-spec as a submodule. Tiles are encoded by converting the existing mvt_tile to mlt::Encoder::Layer and calling the encoder library directly. New CLI flags: --output-format=mlt Encode tiles as MLT instead of MVT --pretessellate Pre-triangulate polygons (MLT only) --no-mlt-feature-sort Disable within-tile Hilbert sorting (MLT only) MLT tiles use .mlt extension in directory output and format=mlt in mbtiles metadata. Compression and all existing flags work unchanged.
This commit is contained in:
Danila Poyarkov
@@ -57,9 +57,22 @@ H = $(wildcard *.h) $(wildcard *.hpp)
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C = $(wildcard *.c) $(wildcard *.cpp)
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INCLUDES = -I/usr/local/include -I. -Iclipper2/include
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MLT_INCLUDES = -Imaplibre-tile-spec/cpp/include -isystem maplibre-tile-spec/cpp/vendor/fsst
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MLT_LIBS = mlt-build/libmlt-cpp-encoder.a mlt-build/libfsst-lib.a
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LIBS = -L/usr/local/lib
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tippecanoe: geojson.o jsonpull/jsonpull.o tile.o pool.o mbtiles.o geometry.o projection.o memfile.o mvt.o serial.o main.o platform.o text.o dirtiles.o pmtiles_file.o plugin.o read_json.o write_json.o geobuf.o flatgeobuf.o evaluator.o geocsv.o csv.o geojson-loop.o json_logger.o visvalingam.o compression.o clip.o sort.o attribute.o thread.o shared_borders.o clipper2/src/clipper.engine.o
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mlt-build/libmlt-cpp-encoder.a: maplibre-tile-spec/cpp/CMakeLists.txt
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cmake -S maplibre-tile-spec/cpp -B mlt-build \
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-DCMAKE_BUILD_TYPE=Release \
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-DMLT_WITH_FASTPFOR=OFF \
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-DMLT_WITH_JSON=OFF \
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-DMLT_WITH_TESTS=OFF \
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-DMLT_WITH_TOOLS=OFF \
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-DCMAKE_CXX_STANDARD=20 \
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$(if $(VERBOSE),,--log-level=WARNING) > /dev/null
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cmake --build mlt-build --target mlt-cpp-encoder $(if $(VERBOSE),,-- -s) > /dev/null
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tippecanoe: geojson.o jsonpull/jsonpull.o tile.o pool.o mbtiles.o geometry.o projection.o memfile.o mvt.o mlt.o serial.o main.o platform.o text.o dirtiles.o pmtiles_file.o plugin.o read_json.o write_json.o geobuf.o flatgeobuf.o evaluator.o geocsv.o csv.o geojson-loop.o json_logger.o visvalingam.o compression.o clip.o sort.o attribute.o thread.o shared_borders.o clipper2/src/clipper.engine.o $(MLT_LIBS)
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$(CXX) $(PG) $(LIBS) $(FINAL_FLAGS) $(CXXFLAGS) -o $@ $^ $(LDFLAGS) -lm -lz -lsqlite3 -lpthread
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tippecanoe-enumerate: enumerate.o
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@@ -85,11 +98,14 @@ tippecanoe-overzoom: overzoom.o mvt.o clip.o evaluator.o jsonpull/jsonpull.o tex
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%.o: %.c
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$(CC) -MMD $(PG) $(INCLUDES) $(FINAL_FLAGS) $(CFLAGS) -c -o $@ $<
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mlt.o: mlt.cpp mlt-build/libmlt-cpp-encoder.a
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$(CXX) -MMD $(PG) $(INCLUDES) $(MLT_INCLUDES) $(FINAL_FLAGS) $(CXXFLAGS) -std=c++20 -c -o $@ $<
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%.o: %.cpp
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$(CXX) -MMD $(PG) $(INCLUDES) $(FINAL_FLAGS) $(CXXFLAGS) -c -o $@ $<
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clean:
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rm -f ./tippecanoe ./tippecanoe-* ./tile-join ./unit *.o *.d */*.o */*.d tests/**/*.mbtiles tests/**/*.check
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rm -rf ./tippecanoe ./tippecanoe-* ./tile-join ./unit *.o *.d */*.o */*.d tests/**/*.mbtiles tests/**/*.check mlt-build
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indent:
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clang-format -i -style="{BasedOnStyle: Google, IndentWidth: 8, UseTab: Always, AllowShortIfStatementsOnASingleLine: false, ColumnLimit: 0, ContinuationIndentWidth: 8, SpaceAfterCStyleCast: true, IndentCaseLabels: false, AllowShortBlocksOnASingleLine: false, AllowShortFunctionsOnASingleLine: false, SortIncludes: false}" $(filter-out flatgeobuf.cpp,$(C)) $(H) jsonpull/*.[ch]
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@@ -97,7 +113,7 @@ indent:
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TESTS = $(wildcard tests/*/out/*.json)
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SPACE = $(NULL) $(NULL)
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test: tippecanoe tippecanoe-decode $(addsuffix .check,$(TESTS)) raw-tiles-test parallel-test pbf-test join-test enumerate-test decode-test join-filter-test unit json-tool-test allow-existing-test csv-test layer-json-test pmtiles-test decode-pmtiles-test overzoom-test
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test: tippecanoe tippecanoe-decode $(addsuffix .check,$(TESTS)) raw-tiles-test parallel-test pbf-test join-test enumerate-test decode-test join-filter-test unit json-tool-test allow-existing-test csv-test layer-json-test pmtiles-test decode-pmtiles-test overzoom-test mlt-test
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./unit
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suffixes = json json.gz
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@@ -584,6 +600,31 @@ layer-json-test: tippecanoe tippecanoe-decode
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cmp tests/layer-json/out.mbtiles.json.check tests/layer-json/out.mbtiles.json
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rm -f tests/layer-json/out.mbtiles.json.check tests/layer-json/out.mbtiles
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mlt-test: tippecanoe
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# Points: MLT output, verify tile count matches MVT
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./tippecanoe -q --output-format=mlt -z5 -f -o tests/mlt/points.mbtiles tests/mlt/points.geojson
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./tippecanoe -q -z5 -f -o tests/mlt/points-mvt.mbtiles tests/mlt/points.geojson
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@test $$(sqlite3 tests/mlt/points.mbtiles "SELECT COUNT(*) FROM tiles") -eq $$(sqlite3 tests/mlt/points-mvt.mbtiles "SELECT COUNT(*) FROM tiles") || (echo "FAIL: MLT and MVT tile counts differ" && exit 1)
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@echo "PASS: MLT tile count matches MVT"
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# Verify format metadata
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@test "$$(sqlite3 tests/mlt/points.mbtiles "SELECT value FROM metadata WHERE name='format'")" = "mlt" || (echo "FAIL: format metadata is not 'mlt'" && exit 1)
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@echo "PASS: MLT format metadata correct"
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# Verify tiles are gzip compressed
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@sqlite3 tests/mlt/points.mbtiles "SELECT hex(substr(tile_data, 1, 2)) FROM tiles LIMIT 1" | grep -q "1F8B" || (echo "FAIL: MLT tiles not gzip compressed" && exit 1)
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@echo "PASS: MLT tiles are gzip compressed"
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# Directory output with .mlt extension
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rm -rf tests/mlt/dir-out
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./tippecanoe -q --output-format=mlt -z2 -f -e tests/mlt/dir-out tests/mlt/points.geojson
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@test $$(find tests/mlt/dir-out -name '*.mlt' | wc -l) -gt 0 || (echo "FAIL: No .mlt files in directory output" && exit 1)
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@test $$(find tests/mlt/dir-out -name '*.pbf' | wc -l) -eq 0 || (echo "FAIL: .pbf files in MLT directory output" && exit 1)
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@echo "PASS: Directory output uses .mlt extension"
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# Pretessellate flag
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./tippecanoe -q --output-format=mlt --pretessellate -z5 -f -o tests/mlt/points-tess.mbtiles tests/mlt/points.geojson
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@test $$(sqlite3 tests/mlt/points-tess.mbtiles "SELECT COUNT(*) FROM tiles") -gt 0 || (echo "FAIL: No tiles with pretessellate" && exit 1)
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@echo "PASS: --pretessellate produces tiles"
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rm -f tests/mlt/points.mbtiles tests/mlt/points-mvt.mbtiles tests/mlt/points-tess.mbtiles
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rm -rf tests/mlt/dir-out
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# Use this target to regenerate the standards that the tests are compared against
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# after making a change that legitimately changes their output
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