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#include <mbgl/test/util.hpp>
#include <mbgl/test/stub_file_source.hpp>
#include <mbgl/test/stub_map_observer.hpp>
#include <mbgl/test/map_adapter.hpp>
#include <mbgl/map/map_options.hpp>
#include <mbgl/gfx/headless_frontend.hpp>
#include <mbgl/style/style.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/util/io.hpp>
#include <mbgl/util/run_loop.hpp>
#include <algorithm>
#include <string>
#include <vector>
using namespace mbgl;
using namespace mbgl::style;
using namespace std::literals::string_literals;
using namespace std::chrono_literals;
TEST(Map, PrefetchTiles) {
util::RunLoop runLoop;
std::shared_ptr<StubFileSource> fileSource = std::make_shared<StubFileSource>();
util::Timer emergencyShutoff;
emergencyShutoff.start(10s, 0s, [&] {
runLoop.stop();
FAIL() << "Did not stop rendering";
});
StubMapObserver observer;
observer.didFinishLoadingMapCallback = [&] () {
runLoop.stop();
};
HeadlessFrontend frontend { { 512, 512 }, 1 };
MapAdapter map(frontend, observer, fileSource,
MapOptions().withMapMode(MapMode::Continuous).withSize(frontend.getSize()));
std::vector<int> tiles;
fileSource->response = [&] (const Resource& res) -> optional<Response> {
static std::string tile = util::read_file("test/fixtures/map/prefetch/tile.png");
auto zoom = std::stoi(res.url);
tiles.push_back(zoom);
Response response;
response.data = std::make_shared<std::string>(tile);
return response;
};
auto checkTilesForZoom = [&](int zoom, const std::vector<int>& expected) {
tiles.clear();
// Force tile reloading.
map.getStyle().loadJSON(util::read_file("test/fixtures/map/prefetch/empty.json"));
map.getStyle().loadJSON(util::read_file("test/fixtures/map/prefetch/style.json"));
map.jumpTo(CameraOptions().withCenter(LatLng { 40.726989, -73.992857 }).withZoom(zoom)); // Manhattan
runLoop.run();
ASSERT_EQ(tiles.size(), expected.size());
ASSERT_TRUE(std::is_permutation(tiles.begin(), tiles.end(), expected.begin()));
};
// Check defaults, should be 4.
ASSERT_EQ(map.getPrefetchZoomDelta(), 4);
checkTilesForZoom(12, { 13, 13, 13, 13, 13, 13, 13, 13, 13, 9 });
// Setting it to 0 disables prefetching.
map.setPrefetchZoomDelta(0);
// No prefetching, raster tiles will use ideal
// tiles instead of the actual zoom level, that is
// why the zoom levels for non-prefetched tiles are
// not the same.
checkTilesForZoom(10, { 11, 11, 11, 11, 11, 11, 11, 11, 11 });
map.setPrefetchZoomDelta(5);
checkTilesForZoom(12, { 13, 13, 13, 13, 13, 13, 13, 13, 13, 8 });
// Should clamp at `minzoom`.
map.setPrefetchZoomDelta(20);
checkTilesForZoom(10, { 11, 11, 11, 11, 11, 11, 11, 11, 11, 0 });
// Disabled again.
map.setPrefetchZoomDelta(0);
checkTilesForZoom(13, { 14, 14, 14, 14, 14, 14, 14, 14, 14 });
}
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