98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
#include <mbgl/test/util.hpp>
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#include <mbgl/test/stub_file_source.hpp>
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#include <mbgl/gl/headless_backend.hpp>
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#include <mbgl/gl/offscreen_view.hpp>
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#include <mbgl/map/map.hpp>
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#include <mbgl/renderer/renderer.hpp>
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#include <mbgl/renderer/backend_scope.hpp>
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#include <mbgl/storage/default_file_source.hpp>
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#include <mbgl/style/style.hpp>
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#include <mbgl/util/default_thread_pool.hpp>
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#include <mbgl/util/image.hpp>
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#include <mbgl/util/io.hpp>
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#include <mbgl/util/run_loop.hpp>
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#include <mbgl/test/stub_renderer_frontend.hpp>
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#include <algorithm>
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#include <string>
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#include <vector>
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using namespace mbgl;
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using namespace mbgl::style;
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using namespace std::literals::string_literals;
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TEST(Map, PrefetchTiles) {
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util::RunLoop runLoop;
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HeadlessBackend backend;
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BackendScope scope(backend);
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OffscreenView view(backend.getContext(), { 512, 512 });
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ThreadPool threadPool(4);
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StubFileSource fileSource;
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StubRendererFrontend rendererFrontend {
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std::make_unique<Renderer>(backend, 1, fileSource, threadPool), view };
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Map map(rendererFrontend, MapObserver::nullObserver(), view.getSize(), 1, fileSource, threadPool, MapMode::Still);
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std::vector<int> tiles;
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fileSource.response = [&] (const Resource& res) -> optional<Response> {
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Response response;
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auto zoom = std::stoi(res.url);
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tiles.push_back(zoom);
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// Return a red tile for prefetched tiles or green to the actual tile.
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// The end rendering result should be all green because the map is only
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// considered fully rendered when only ideal tiles are shown.
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if (zoom == int(map.getZoom()) + 1) {
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response.data = std::make_shared<std::string>(
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util::read_file("test/fixtures/map/prefetch/tile_green.png"));
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} else {
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response.data = std::make_shared<std::string>(
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util::read_file("test/fixtures/map/prefetch/tile_red.png"));
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}
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return { std::move(response) };
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};
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auto checkTilesForZoom = [&](int zoom, const std::vector<int>& expected) {
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tiles.clear();
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// Force tile reloading.
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map.getStyle().loadJSON(util::read_file("test/fixtures/map/prefetch/empty.json"));
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map.getStyle().loadJSON(util::read_file("test/fixtures/map/prefetch/style.json"));
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map.setLatLngZoom({ 40.726989, -73.992857 }, zoom); // Manhattan
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// Should always render the ideal tiles (i.e. a green map)
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test::checkImage("test/fixtures/map/prefetch", test::render(map, view));
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ASSERT_TRUE(std::is_permutation(tiles.begin(), tiles.end(), expected.begin()));
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ASSERT_FALSE(tiles.empty());
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};
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// Check defaults, should be 4.
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ASSERT_EQ(map.getPrefetchZoomDelta(), 4);
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checkTilesForZoom(12, { 13, 13, 13, 13, 13, 13, 13, 13, 13, 9 });
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// Setting it to 0 disables prefetching.
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map.setPrefetchZoomDelta(0);
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// No prefetching, raster tiles will use ideal
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// tiles instead of the actual zoom level, that is
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// why the zoom levels for non-prefetched tiles are
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// not the same.
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checkTilesForZoom(10, { 11, 11, 11, 11, 11, 11, 11, 11, 11 });
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map.setPrefetchZoomDelta(5);
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checkTilesForZoom(12, { 13, 13, 13, 13, 13, 13, 13, 13, 13, 8 });
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// Should clamp at `minzoom`.
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map.setPrefetchZoomDelta(20);
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checkTilesForZoom(10, { 11, 11, 11, 11, 11, 11, 11, 11, 11, 0 });
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// Disabled again.
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map.setPrefetchZoomDelta(0);
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checkTilesForZoom(13, { 14, 14, 14, 14, 14, 14, 14, 14, 14 });
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}
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