InputDispatcher: Add InputTracerInterface for tracing input events
The interface documents how the tracer will interact with
InputDispatcher.
Bug: 210460522
Test: Build
Change-Id: Id97f9b0851f1248956b95e8b18b2302ecff1bff5
diff --git a/services/inputflinger/dispatcher/trace/InputTracingBackendInterface.h b/services/inputflinger/dispatcher/trace/InputTracingBackendInterface.h
new file mode 100644
index 0000000..b430a5b
--- /dev/null
+++ b/services/inputflinger/dispatcher/trace/InputTracingBackendInterface.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "../Entry.h"
+
+namespace android::inputdispatcher::trace {
+
+/**
+ * An interface for the tracing backend, used for setting a custom backend for testing.
+ */
+class InputTracingBackendInterface {
+public:
+ virtual ~InputTracingBackendInterface() = default;
+
+ /** Trace a KeyEvent. */
+ virtual void traceKeyEvent(const KeyEntry&) const = 0;
+
+ /** Trace a MotionEvent. */
+ virtual void traceMotionEvent(const MotionEntry&) const = 0;
+
+ /** Trace an event being sent to a window. */
+ struct WindowDispatchArgs {
+ std::variant<MotionEntry, KeyEntry> eventEntry;
+ nsecs_t deliveryTime;
+ int32_t resolvedFlags;
+ gui::Uid targetUid;
+ int64_t vsyncId;
+ int32_t windowId;
+ ui::Transform transform;
+ ui::Transform rawTransform;
+ std::array<uint8_t, 32> hmac;
+ };
+ virtual void traceWindowDispatch(const WindowDispatchArgs&) const = 0;
+};
+
+} // namespace android::inputdispatcher::trace