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#include <mbgl/test/util.hpp>
#include <mbgl/test/stub_file_source.hpp>
#include <mbgl/gl/headless_backend.hpp>
#include <mbgl/gl/offscreen_view.hpp>
#include <mbgl/map/backend_scope.hpp>
#include <mbgl/map/map.hpp>
#include <mbgl/storage/default_file_source.hpp>
#include <mbgl/style/style.hpp>
#include <mbgl/util/default_thread_pool.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;
TEST(Map, PrefetchTiles) {
util::RunLoop runLoop;
HeadlessBackend backend(test::sharedDisplay());
BackendScope scope(backend);
OffscreenView view(backend.getContext(), { 512, 512 });
ThreadPool threadPool(4);
StubFileSource fileSource;
Map map(backend, MapObserver::nullObserver(), view.getSize(), 1, fileSource, threadPool, MapMode::Still);
std::vector<int> tiles;
fileSource.response = [&] (const Resource& res) -> optional<Response> {
Response response;
auto zoom = std::stoi(res.url);
tiles.push_back(zoom);
// Return a red tile for prefetched tiles or green to the actual tile.
// The end rendering result should be all green because the map is only
// considered fully rendered when only ideal tiles are shown.
if (zoom == int(map.getZoom()) + 1) {
response.data = std::make_shared<std::string>(
util::read_file("test/fixtures/map/prefetch/tile_green.png"));
} else {
response.data = std::make_shared<std::string>(
util::read_file("test/fixtures/map/prefetch/tile_red.png"));
}
return { std::move(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.setLatLngZoom({ 40.726989, -73.992857 }, zoom); // Manhattan
// Should always render the ideal tiles (i.e. a green map)
test::checkImage("test/fixtures/map/prefetch", test::render(map, view));
ASSERT_TRUE(std::is_permutation(tiles.begin(), tiles.end(), expected.begin()));
ASSERT_FALSE(tiles.empty());
};
// 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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