1 /*
2 * Copyright 2022 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/CompositorTiming.h>
19
20 namespace android::test {
21 namespace {
22
23 constexpr nsecs_t kMillisecond = 1'000'000;
24 constexpr nsecs_t kVsyncPeriod = 8'333'333;
25 constexpr nsecs_t kVsyncPhase = -2'166'667;
26 constexpr nsecs_t kIdealLatency = -kVsyncPhase;
27
28 } // namespace
29
TEST(CompositorTimingTest,InvalidVsyncPeriod)30 TEST(CompositorTimingTest, InvalidVsyncPeriod) {
31 const nsecs_t vsyncDeadline = systemTime();
32 constexpr nsecs_t kInvalidVsyncPeriod = -1;
33
34 const gui::CompositorTiming timing(vsyncDeadline, kInvalidVsyncPeriod, kVsyncPhase,
35 kIdealLatency);
36
37 EXPECT_EQ(timing.deadline, 0);
38 EXPECT_EQ(timing.interval, gui::CompositorTiming::kDefaultVsyncPeriod);
39 EXPECT_EQ(timing.presentLatency, gui::CompositorTiming::kDefaultVsyncPeriod);
40 }
41
TEST(CompositorTimingTest,PresentLatencySnapping)42 TEST(CompositorTimingTest, PresentLatencySnapping) {
43 for (nsecs_t presentDelay = 0, compositeTime = systemTime(); presentDelay < 10 * kVsyncPeriod;
44 presentDelay += kMillisecond, compositeTime += kVsyncPeriod) {
45 const nsecs_t presentLatency = kIdealLatency + presentDelay;
46 const nsecs_t vsyncDeadline = compositeTime + presentLatency + kVsyncPeriod;
47
48 const gui::CompositorTiming timing(vsyncDeadline, kVsyncPeriod, kVsyncPhase,
49 presentLatency);
50
51 EXPECT_EQ(timing.deadline, compositeTime + presentDelay + kVsyncPeriod);
52 EXPECT_EQ(timing.interval, kVsyncPeriod);
53
54 // The presentDelay should be rounded to a multiple of the VSYNC period, such that the
55 // remainder (presentLatency % interval) always evaluates to the VSYNC phase offset.
56 EXPECT_GE(timing.presentLatency, kIdealLatency);
57 EXPECT_EQ(timing.presentLatency % timing.interval, kIdealLatency);
58 }
59 }
60
61 } // namespace android::test
62