[benchmark] add render benchmarks

benchmark/api/render.benchmark.cpp

@@ -0,0 +1,79 @@
+#include <benchmark/benchmark.h>
+
+#include <mbgl/benchmark/util.hpp>
+#include <mbgl/map/map.hpp>
+#include <mbgl/map/backend_scope.hpp>
+#include <mbgl/gl/headless_backend.hpp>
+#include <mbgl/gl/offscreen_view.hpp>
+#include <mbgl/util/default_thread_pool.hpp>
+#include <mbgl/style/style.hpp>
+#include <mbgl/style/image.hpp>
+#include <mbgl/storage/default_file_source.hpp>
+#include <mbgl/storage/network_status.hpp>
+#include <mbgl/util/image.hpp>
+#include <mbgl/util/io.hpp>
+#include <mbgl/util/run_loop.hpp>
+
+using namespace mbgl;
+
+namespace {
+
+class RenderBenchmark {
+public:
+    RenderBenchmark() {
+        NetworkStatus::Set(NetworkStatus::Status::Offline);
+        fileSource.setAccessToken("foobar");
+    }
+
+    util::RunLoop loop;
+    HeadlessBackend backend;
+    BackendScope scope { backend };
+    OffscreenView view { backend.getContext(), { 1000, 1000 } };
+    DefaultFileSource fileSource { "benchmark/fixtures/api/cache.db", "." };
+    ThreadPool threadPool { 4 };
+};
+    
+static void prepare(Map& map, optional<std::string> json = {}) {
+    map.getStyle().loadJSON(json ? *json : util::read_file("benchmark/fixtures/api/style.json"));
+    map.setLatLngZoom({ 40.726989, -73.992857 }, 15); // Manhattan
+    map.getStyle().addImage(std::make_unique<style::Image>("test-icon",
+                                                           decodeImage(util::read_file("benchmark/fixtures/api/default_marker.png")), 1.0));
+}
+ 
+} // end namespace
+
+static void API_renderStill_reuse_map(::benchmark::State& state) {
+    RenderBenchmark bench;
+    Map map { bench.backend, bench.view.getSize(), 1, bench.fileSource, bench.threadPool, MapMode::Still };
+    prepare(map);
+
+    while (state.KeepRunning()) {
+        mbgl::benchmark::render(map, bench.view);
+    }
+}
+
+static void API_renderStill_reuse_map_switch_styles(::benchmark::State& state) {
+    RenderBenchmark bench;
+    Map map { bench.backend, bench.view.getSize(), 1, bench.fileSource, bench.threadPool, MapMode::Still };
+    
+    while (state.KeepRunning()) {
+        prepare(map, { "{}" });
+        mbgl::benchmark::render(map, bench.view);
+        prepare(map);
+        mbgl::benchmark::render(map, bench.view);
+    }
+}
+
+static void API_renderStill_recreate_map(::benchmark::State& state) {
+    RenderBenchmark bench;
+    
+    while (state.KeepRunning()) {
+        Map map { bench.backend, bench.view.getSize(), 1, bench.fileSource, bench.threadPool, MapMode::Still };
+        prepare(map);
+        mbgl::benchmark::render(map, bench.view);
+    }
+}
+
+BENCHMARK(API_renderStill_reuse_map);
+BENCHMARK(API_renderStill_reuse_map_switch_styles);
+BENCHMARK(API_renderStill_recreate_map);