tippecanoe/unit.cpp

#define CATCH_CONFIG_MAIN
#include "catch/catch.hpp"
#include "text.hpp"
#include "sort.hpp"
#include "tile-cache.hpp"
#include "projection.hpp"
#include <unistd.h>
#include <limits.h>

TEST_CASE("UTF-8 enforcement", "[utf8]") {
	REQUIRE(check_utf8("") == std::string(""));
	REQUIRE(check_utf8("hello world") == std::string(""));
	REQUIRE(check_utf8("Καλημέρα κόσμε") == std::string(""));
	REQUIRE(check_utf8("こんにちは 世界") == std::string(""));
	REQUIRE(check_utf8("👋🌏") == std::string(""));
	REQUIRE(check_utf8("Hola m\xF3n") == std::string("\"Hola m\xF3n\" is not valid UTF-8 (0xF3 0x6E)"));
}

TEST_CASE("UTF-8 truncation", "[trunc]") {
	REQUIRE(truncate16("0123456789abcdefghi", 16) == std::string("0123456789abcdef"));
	REQUIRE(truncate16("0123456789éîôüéîôüç", 16) == std::string("0123456789éîôüéî"));
	REQUIRE(truncate16("0123456789😀😬😁😂😃😄😅😆", 16) == std::string("0123456789😀😬😁"));
	REQUIRE(truncate16("0123456789😀😬😁😂😃😄😅😆", 17) == std::string("0123456789😀😬😁"));
	REQUIRE(truncate16("0123456789あいうえおかきくけこさ", 16) == std::string("0123456789あいうえおか"));
}

int intcmp(const void *v1, const void *v2) {
	return *((int *) v1) - *((int *) v2);
}

TEST_CASE("External quicksort", "fqsort") {
	std::vector<FILE *> inputs;

	size_t written = 0;
	for (size_t i = 0; i < 5; i++) {
		std::string tmpname = "/tmp/in.XXXXXXX";
		int fd = mkstemp((char *) tmpname.c_str());
		unlink(tmpname.c_str());
		FILE *f = fdopen(fd, "w+b");
		inputs.emplace_back(f);
		size_t iterations = 2000 + rand() % 200;
		for (size_t j = 0; j < iterations; j++) {
			int n = rand();
			fwrite((void *) &n, sizeof(int), 1, f);
			written++;
		}
		rewind(f);
	}

	std::string tmpname = "/tmp/out.XXXXXX";
	int fd = mkstemp((char *) tmpname.c_str());
	unlink(tmpname.c_str());
	FILE *f = fdopen(fd, "w+b");

	fqsort(inputs, sizeof(int), intcmp, f, 256);
	rewind(f);

	int prev = INT_MIN;
	int here;
	size_t nread = 0;
	while (fread((void *) &here, sizeof(int), 1, f)) {
		REQUIRE(here >= prev);
		prev = here;
		nread++;
	}

	fclose(f);
	REQUIRE(nread == written);
}

mvt_tile mock_get_tile(zxy tile) {
	mvt_layer l;
	l.name = std::to_string(tile.z) + "/" + std::to_string(tile.x) + "/" + std::to_string(tile.y);
	mvt_tile t;
	t.layers.push_back(l);
	return t;
}

TEST_CASE("Tile-join cache", "tile cache") {
	tile_cache tc;
	tc.capacity = 5;

	REQUIRE(tc.get(zxy(11, 327, 791), mock_get_tile).layers[0].name == "11/327/791");
	REQUIRE(tc.get(zxy(11, 5, 7), mock_get_tile).layers[0].name == "11/5/7");
	REQUIRE(tc.get(zxy(11, 5, 8), mock_get_tile).layers[0].name == "11/5/8");
	REQUIRE(tc.get(zxy(11, 5, 9), mock_get_tile).layers[0].name == "11/5/9");
	REQUIRE(tc.get(zxy(11, 5, 10), mock_get_tile).layers[0].name == "11/5/10");
	REQUIRE(tc.get(zxy(11, 327, 791), mock_get_tile).layers[0].name == "11/327/791");
	REQUIRE(tc.overzoom_cache.size() == 5);
	REQUIRE(tc.overzoom_cache.find(zxy(11, 327, 791)) != tc.overzoom_cache.end());
	REQUIRE(tc.overzoom_cache.find(zxy(11, 5, 7)) != tc.overzoom_cache.end());

	// verify that additional gets evict the least-recently-used elements

	REQUIRE(tc.get(zxy(11, 5, 11), mock_get_tile).layers[0].name == "11/5/11");
	REQUIRE(tc.overzoom_cache.size() == 5);
	REQUIRE(tc.overzoom_cache.find(zxy(11, 5, 7)) == tc.overzoom_cache.end());

	REQUIRE(tc.get(zxy(11, 5, 12), mock_get_tile).layers[0].name == "11/5/12");
	REQUIRE(tc.overzoom_cache.size() == 5);
	REQUIRE(tc.overzoom_cache.find(zxy(11, 5, 8)) == tc.overzoom_cache.end());
}

TEST_CASE("Bit reversal", "bit reversal") {
	REQUIRE(bit_reverse(1) == 0x8000000000000000);
	REQUIRE(bit_reverse(0x1234567812489BCF) == 0xF3D912481E6A2C48);
	REQUIRE(bit_reverse(0xF3D912481E6A2C48) == 0x1234567812489BCF);
}

TEST_CASE("Projection", "projection") {
	// troublesome point from tests/accumulate/in.json
	long long wx36, wy36;
	lonlat2tile(-123.948513, -81.873970, 36, &wx36, &wy36);
	REQUIRE(wx36 == 0x27dbdc9fb);
	REQUIRE(wy36 == 0xebc06c629);

	long long wx32, wy32;
	lonlat2tile(-123.948513, -81.873970, 32, &wx32, &wy32);
	REQUIRE(wx32 == 0x27dbdca0);
	REQUIRE(wy32 == 0xebc06c63);

	REQUIRE(std::llround(wx36 / 16.0) == wx32);
	REQUIRE(std::llround(wy36 / 16.0) == wy32);
}

TEST_CASE("Quadkey index", "quadkey index") {
	unsigned long long a = (unsigned) 1234567890;
	unsigned long long b = (unsigned) 3210987654;

	unsigned long long x = (b << 32) | a;
	unsigned long long y = (a << 32) | b;
	index_t encoded;
	unsigned long long nx, ny;

	encoded = encode_quadkey(x, y);
	// the *bottom* 64 bits of the 128-bit encoding
	// are the same as the 64-bit encoding of a, b
	REQUIRE((unsigned long long) encoded == 7338499239188161052ULL);
	REQUIRE((unsigned long long) (encoded >> 64) == 11163131681630900524ULL);
	decode_quadkey(encoded, &nx, &ny);
	REQUIRE(nx == x);
	REQUIRE(ny == y);

	encoded = encode_hilbert(y, x);
	// the *top* 64 bits of the 128-bit encoding
	// of the 64-bit encoding of a, b
	REQUIRE((unsigned long long) (encoded >> 64) == 8447864191955811122ULL);
	REQUIRE((unsigned long long) encoded == 16122461378071376152ULL);
	decode_hilbert(encoded, &ny, &nx);
	REQUIRE(nx == x);
	REQUIRE(ny == y);
}