Align DisplayEventReceiver events
The structs are aligned differently on x86 vs x64, causing them to
parse messages wrong.
Test: CtsGraphicsTestCases android.graphics.drawable.cts.AnimatedImageDrawableTest#testLifeCycle
Bug: 149314120
Change-Id: I745ba7647ecadffed016f1694a7b4a81c5ef195c
diff --git a/libs/gui/tests/DisplayEventStructLayout_test.cpp b/libs/gui/tests/DisplayEventStructLayout_test.cpp
new file mode 100644
index 0000000..4bcb795
--- /dev/null
+++ b/libs/gui/tests/DisplayEventStructLayout_test.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include <gtest/gtest.h>
+#include <gui/DisplayEventReceiver.h>
+
+namespace android::test {
+
+#define CHECK_OFFSET(type, member, expected_offset) \
+ static_assert((offsetof(type, member) == (expected_offset)), "")
+
+TEST(DisplayEventStructLayoutTest, TestEventAlignment) {
+ CHECK_OFFSET(DisplayEventReceiver::Event, vsync, 24);
+ CHECK_OFFSET(DisplayEventReceiver::Event, hotplug, 24);
+ CHECK_OFFSET(DisplayEventReceiver::Event, config, 24);
+
+ CHECK_OFFSET(DisplayEventReceiver::Event::Header, type, 0);
+ CHECK_OFFSET(DisplayEventReceiver::Event::Header, displayId, 8);
+ CHECK_OFFSET(DisplayEventReceiver::Event::Header, timestamp, 16);
+
+ CHECK_OFFSET(DisplayEventReceiver::Event::VSync, count, 0);
+ CHECK_OFFSET(DisplayEventReceiver::Event::VSync, expectedVSyncTimestamp, 8);
+
+ CHECK_OFFSET(DisplayEventReceiver::Event::Hotplug, connected, 0);
+
+ CHECK_OFFSET(DisplayEventReceiver::Event::Config, configId, 0);
+ CHECK_OFFSET(DisplayEventReceiver::Event::Config, vsyncPeriod, 8);
+}
+
+} // namespace android::test