1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <gtest/gtest.h>
18 #include <gui/DisplayEventReceiver.h>
19
20 namespace android::test {
21
22 #define CHECK_OFFSET(type, member, expected_offset) \
23 static_assert((offsetof(type, member) == (expected_offset)))
24
TEST(DisplayEventStructLayoutTest,TestEventAlignment)25 TEST(DisplayEventStructLayoutTest, TestEventAlignment) {
26 static_assert(std::is_pod<DisplayEventReceiver::Event::VSync>::value);
27 CHECK_OFFSET(DisplayEventReceiver::Event, vsync, 24);
28 CHECK_OFFSET(DisplayEventReceiver::Event, hotplug, 24);
29 CHECK_OFFSET(DisplayEventReceiver::Event, modeChange, 24);
30
31 CHECK_OFFSET(DisplayEventReceiver::Event::Header, type, 0);
32 CHECK_OFFSET(DisplayEventReceiver::Event::Header, displayId, 8);
33 CHECK_OFFSET(DisplayEventReceiver::Event::Header, timestamp, 16);
34
35 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, count, 0);
36 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.frameInterval, 8);
37 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.preferredFrameTimelineIndex, 16);
38 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.frameTimelinesLength, 20);
39 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.frameTimelines, 24);
40 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.frameTimelines[0].vsyncId, 24);
41 CHECK_OFFSET(DisplayEventReceiver::Event::VSync, vsyncData.frameTimelines[0].deadlineTimestamp,
42 32);
43 CHECK_OFFSET(DisplayEventReceiver::Event::VSync,
44 vsyncData.frameTimelines[0].expectedPresentationTime, 40);
45 // Also test the offsets of the last frame timeline. A loop is not used because the non-const
46 // index cannot be used in static_assert.
47 const int lastFrameTimelineOffset = /* Start of array */ 24 +
48 (VsyncEventData::kFrameTimelinesCapacity - 1) * /* Size of FrameTimeline */ 24;
49 CHECK_OFFSET(DisplayEventReceiver::Event::VSync,
50 vsyncData.frameTimelines[VsyncEventData::kFrameTimelinesCapacity - 1].vsyncId,
51 lastFrameTimelineOffset);
52 CHECK_OFFSET(DisplayEventReceiver::Event::VSync,
53 vsyncData.frameTimelines[VsyncEventData::kFrameTimelinesCapacity - 1]
54 .deadlineTimestamp,
55 lastFrameTimelineOffset + 8);
56 CHECK_OFFSET(DisplayEventReceiver::Event::VSync,
57 vsyncData.frameTimelines[VsyncEventData::kFrameTimelinesCapacity - 1]
58 .expectedPresentationTime,
59 lastFrameTimelineOffset + 16);
60
61 CHECK_OFFSET(DisplayEventReceiver::Event::Hotplug, connected, 0);
62 CHECK_OFFSET(DisplayEventReceiver::Event::Hotplug, connectionError, 4);
63
64 CHECK_OFFSET(DisplayEventReceiver::Event::ModeChange, modeId, 0);
65 CHECK_OFFSET(DisplayEventReceiver::Event::ModeChange, vsyncPeriod, 8);
66
67 CHECK_OFFSET(DisplayEventReceiver::Event::FrameRateOverride, uid, 0);
68 CHECK_OFFSET(DisplayEventReceiver::Event::FrameRateOverride, frameRateHz, 8);
69 }
70
71 } // namespace android::test
72