wip low fps mode for hidden states and powersave modes.

dont use yet, as all compute is still done in the render method

src/main_screen.cpp

@@ -78,6 +78,41 @@ bool MainScreen::handleEvent(SDL_Event& e) {
 		return true; // TODO: forward return succ from sendFilePath()
 	}
 
+	if (
+		e.type == SDL_EVENT_WINDOW_MINIMIZED ||
+		e.type == SDL_EVENT_WINDOW_HIDDEN ||
+		e.type == SDL_EVENT_WINDOW_OCCLUDED // does this trigger on partial occlusion?
+	) {
+		auto* window = SDL_GetWindowFromID(e.window.windowID);
+		auto* event_renderer = SDL_GetRenderer(window);
+		if (event_renderer != nullptr && event_renderer == renderer) {
+			// our window is now obstructed
+			if (_window_hidden_ts < e.window.timestamp) {
+				_window_hidden_ts = e.window.timestamp;
+				_window_hidden = true;
+				//std::cout << "TOMAT: window hidden " << e.window.timestamp << "\n";
+			}
+		}
+		return true; // forward?
+	}
+
+	if (
+		e.type == SDL_EVENT_WINDOW_SHOWN ||
+		e.type == SDL_EVENT_WINDOW_RESTORED ||
+		e.type == SDL_EVENT_WINDOW_EXPOSED
+	) {
+		auto* window = SDL_GetWindowFromID(e.window.windowID);
+		auto* event_renderer = SDL_GetRenderer(window);
+		if (event_renderer != nullptr && event_renderer == renderer) {
+			if (_window_hidden_ts <= e.window.timestamp) {
+				_window_hidden_ts = e.window.timestamp;
+				_window_hidden = false;
+				//std::cout << "TOMAT: window shown " << e.window.timestamp << "\n";
+			}
+		}
+		return true; // forward?
+	}
+
 	return false;
 }
 
@@ -115,17 +150,57 @@ Screen* MainScreen::render(float time_delta, bool& quit) {
 	tuiu.render();
 	tdch.render();
 
+	{ // main window menubar injection
+		if (ImGui::Begin("tomato")) {
+			if (ImGui::BeginMenuBar()) {
+				// ImGui::Separator(); // why do we not need this????
+				if (ImGui::BeginMenu("Performance")) {
+					{ // fps
+						const auto targets = "normal\0power save\0";
+						ImGui::SetNextItemWidth(ImGui::GetFontSize()*10);
+						ImGui::Combo("fps mode", &_fps_perf_mode, targets, 4);
+					}
+
+					{ // compute
+						const auto targets = "normal\0power save\0";
+						ImGui::SetNextItemWidth(ImGui::GetFontSize()*10);
+						ImGui::Combo("compute mode", &_compute_perf_mode, targets, 4);
+						ImGui::SetItemTooltip("Limiting compute can slow down things filetransfers.");
+					}
+
+					ImGui::EndMenu();
+				}
+				ImGui::EndMenuBar();
+			}
+
+		}
+		ImGui::End();
+	}
+
+
 	if constexpr (false) {
 		ImGui::ShowDemoWindow();
 	}
 
+	if (
+		_fps_perf_mode == 1 || // TODO: magic
+		_window_hidden
+	) {
+		_render_interval = 1.f/4.f;
+	} else {
+		_render_interval = 1.f/60.f;
+	}
+
 	return nullptr;
 }
 
 Screen* MainScreen::tick(float time_delta, bool& quit) {
-	_min_tick_interval = std::min<float>(
+	_min_tick_interval = std::max<float>(
+		std::min<float>(
 			tc.toxIterationInterval()/1000.f,
 			0.03f // HACK: 30ms upper bound, should be the same as tox but will change
+		),
+		(_compute_perf_mode == 0 ? 0.001f : 0.1f) // in powersave fix the lowerbound to 100ms
 	);
 
 	return nullptr;

src/main_screen.hpp

@@ -38,8 +38,6 @@ extern "C" {
 struct MainScreen final : public Screen {
 	SDL_Renderer* renderer;
 
-	std::chrono::high_resolution_clock::time_point last_time = std::chrono::high_resolution_clock::now();
-
 	SimpleConfigModel conf;
 	Contact3Registry cr;
 	RegistryMessageModel rmm;
@@ -66,6 +64,9 @@ struct MainScreen final : public Screen {
 	ToxUIUtils tuiu;
 	ToxDHTCapHisto tdch;
 
+	bool _window_hidden {false};
+	bool _window_hidden_ts {0};
+
 	MainScreen(SDL_Renderer* renderer_, std::string save_path, std::string save_password, std::vector<std::string> plugins);
 	~MainScreen(void);
 
@@ -76,6 +77,11 @@ struct MainScreen final : public Screen {
 	Screen* render(float time_delta, bool&) override;
 	Screen* tick(float time_delta, bool&) override;
 
+	// 0 - normal
+	// 1 - power save
+	int _fps_perf_mode {0};
+	int _compute_perf_mode {0};
+
 	float _render_interval {1.f/60.f};
 	float _min_tick_interval {0.f};