input_engine: Avoid redundant map lookups

We can use iterators to avoid looking up into maps twice in the getter
functions.

At the same time we can also avoid copying the ControllerData structs,
since they're 264 bytes in size.

src/input_common/input_engine.cpp

@@ -104,68 +104,76 @@ void InputEngine::SetMotion(const PadIdentifier& identifier, int motion, const B
 
 bool InputEngine::GetButton(const PadIdentifier& identifier, int button) const {
     std::lock_guard lock{mutex};
-    if (!controller_list.contains(identifier)) {
+    const auto controller_iter = controller_list.find(identifier);
+    if (controller_iter == controller_list.cend()) {
         LOG_ERROR(Input, "Invalid identifier guid={}, pad={}, port={}", identifier.guid.Format(),
                   identifier.pad, identifier.port);
         return false;
     }
-    ControllerData controller = controller_list.at(identifier);
-    if (!controller.buttons.contains(button)) {
+    const ControllerData& controller = controller_iter->second;
+    const auto button_iter = controller.buttons.find(button);
+    if (button_iter == controller.buttons.cend()) {
         LOG_ERROR(Input, "Invalid button {}", button);
         return false;
     }
-    return controller.buttons.at(button);
+    return button_iter->second;
 }
 
 bool InputEngine::GetHatButton(const PadIdentifier& identifier, int button, u8 direction) const {
     std::lock_guard lock{mutex};
-    if (!controller_list.contains(identifier)) {
+    const auto controller_iter = controller_list.find(identifier);
+    if (controller_iter == controller_list.cend()) {
         LOG_ERROR(Input, "Invalid identifier guid={}, pad={}, port={}", identifier.guid.Format(),
                   identifier.pad, identifier.port);
         return false;
     }
-    ControllerData controller = controller_list.at(identifier);
-    if (!controller.hat_buttons.contains(button)) {
+    const ControllerData& controller = controller_iter->second;
+    const auto hat_iter = controller.hat_buttons.find(button);
+    if (hat_iter == controller.hat_buttons.cend()) {
         LOG_ERROR(Input, "Invalid hat button {}", button);
         return false;
     }
-    return (controller.hat_buttons.at(button) & direction) != 0;
+    return (hat_iter->second & direction) != 0;
 }
 
 f32 InputEngine::GetAxis(const PadIdentifier& identifier, int axis) const {
     std::lock_guard lock{mutex};
-    if (!controller_list.contains(identifier)) {
+    const auto controller_iter = controller_list.find(identifier);
+    if (controller_iter == controller_list.cend()) {
         LOG_ERROR(Input, "Invalid identifier guid={}, pad={}, port={}", identifier.guid.Format(),
                   identifier.pad, identifier.port);
         return 0.0f;
     }
-    ControllerData controller = controller_list.at(identifier);
-    if (!controller.axes.contains(axis)) {
+    const ControllerData& controller = controller_iter->second;
+    const auto axis_iter = controller.axes.find(axis);
+    if (axis_iter == controller.axes.cend()) {
         LOG_ERROR(Input, "Invalid axis {}", axis);
         return 0.0f;
     }
-    return controller.axes.at(axis);
+    return axis_iter->second;
 }
 
 BatteryLevel InputEngine::GetBattery(const PadIdentifier& identifier) const {
     std::lock_guard lock{mutex};
-    if (!controller_list.contains(identifier)) {
+    const auto controller_iter = controller_list.find(identifier);
+    if (controller_iter == controller_list.cend()) {
         LOG_ERROR(Input, "Invalid identifier guid={}, pad={}, port={}", identifier.guid.Format(),
                   identifier.pad, identifier.port);
         return BatteryLevel::Charging;
     }
-    ControllerData controller = controller_list.at(identifier);
+    const ControllerData& controller = controller_iter->second;
     return controller.battery;
 }
 
 BasicMotion InputEngine::GetMotion(const PadIdentifier& identifier, int motion) const {
     std::lock_guard lock{mutex};
-    if (!controller_list.contains(identifier)) {
+    const auto controller_iter = controller_list.find(identifier);
+    if (controller_iter == controller_list.cend()) {
         LOG_ERROR(Input, "Invalid identifier guid={}, pad={}, port={}", identifier.guid.Format(),
                   identifier.pad, identifier.port);
         return {};
     }
-    ControllerData controller = controller_list.at(identifier);
+    const ControllerData& controller = controller_iter->second;
     return controller.motions.at(motion);
 }