1 /*
2 * Copyright 2019 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 <compositionengine/impl/HwcBufferCache.h>
18 #include <gtest/gtest.h>
19 #include <gui/BufferQueue.h>
20 #include <ui/GraphicBuffer.h>
21
22 namespace android::compositionengine {
23 namespace {
24
25 class TestableHwcBufferCache : public impl::HwcBufferCache {
26 public:
getHwcBuffer(int slot,const sp<GraphicBuffer> & buffer,uint32_t * outSlot,sp<GraphicBuffer> * outBuffer)27 void getHwcBuffer(int slot, const sp<GraphicBuffer>& buffer, uint32_t* outSlot,
28 sp<GraphicBuffer>* outBuffer) {
29 HwcBufferCache::getHwcBuffer(slot, buffer, outSlot, outBuffer);
30 }
31 };
32
33 class HwcBufferCacheTest : public testing::Test {
34 public:
35 ~HwcBufferCacheTest() override = default;
36
testSlot(const int inSlot,const uint32_t expectedSlot)37 void testSlot(const int inSlot, const uint32_t expectedSlot) {
38 uint32_t outSlot;
39 sp<GraphicBuffer> outBuffer;
40
41 // The first time, the output is the same as the input
42 mCache.getHwcBuffer(inSlot, mBuffer1, &outSlot, &outBuffer);
43 EXPECT_EQ(expectedSlot, outSlot);
44 EXPECT_EQ(mBuffer1, outBuffer);
45
46 // The second time with the same buffer, the outBuffer is nullptr.
47 mCache.getHwcBuffer(inSlot, mBuffer1, &outSlot, &outBuffer);
48 EXPECT_EQ(expectedSlot, outSlot);
49 EXPECT_EQ(nullptr, outBuffer.get());
50
51 // With a new buffer, the outBuffer is the input.
52 mCache.getHwcBuffer(inSlot, mBuffer2, &outSlot, &outBuffer);
53 EXPECT_EQ(expectedSlot, outSlot);
54 EXPECT_EQ(mBuffer2, outBuffer);
55
56 // Again, the second request with the same buffer sets outBuffer to nullptr.
57 mCache.getHwcBuffer(inSlot, mBuffer2, &outSlot, &outBuffer);
58 EXPECT_EQ(expectedSlot, outSlot);
59 EXPECT_EQ(nullptr, outBuffer.get());
60
61 // Setting a slot to use nullptr lookslike works, but note that
62 // the output values make it look like no new buffer is being set....
63 mCache.getHwcBuffer(inSlot, sp<GraphicBuffer>(), &outSlot, &outBuffer);
64 EXPECT_EQ(expectedSlot, outSlot);
65 EXPECT_EQ(nullptr, outBuffer.get());
66 }
67
68 impl::HwcBufferCache mCache;
69 sp<GraphicBuffer> mBuffer1{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
70 sp<GraphicBuffer> mBuffer2{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
71 };
72
TEST_F(HwcBufferCacheTest,cacheWorksForSlotZero)73 TEST_F(HwcBufferCacheTest, cacheWorksForSlotZero) {
74 testSlot(0, 0);
75 }
76
TEST_F(HwcBufferCacheTest,cacheWorksForMaxSlot)77 TEST_F(HwcBufferCacheTest, cacheWorksForMaxSlot) {
78 testSlot(BufferQueue::NUM_BUFFER_SLOTS - 1, BufferQueue::NUM_BUFFER_SLOTS - 1);
79 }
80
TEST_F(HwcBufferCacheTest,cacheMapsNegativeSlotToZero)81 TEST_F(HwcBufferCacheTest, cacheMapsNegativeSlotToZero) {
82 testSlot(-123, 0);
83 }
84
85 } // namespace
86 } // namespace android::compositionengine
87