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/*
* Copyright 2019 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 <compositionengine/impl/HwcBufferCache.h>
#include <gtest/gtest.h>
#include <gui/BufferQueue.h>
#include <ui/GraphicBuffer.h>
namespace android::compositionengine {
namespace {
class TestableHwcBufferCache : public impl::HwcBufferCache {
public:
void getHwcBuffer(int slot, const sp<GraphicBuffer>& buffer, uint32_t* outSlot,
sp<GraphicBuffer>* outBuffer) {
HwcBufferCache::getHwcBuffer(slot, buffer, outSlot, outBuffer);
}
};
class HwcBufferCacheTest : public testing::Test {
public:
~HwcBufferCacheTest() override = default;
void testSlot(const int inSlot, const uint32_t expectedSlot) {
uint32_t outSlot;
sp<GraphicBuffer> outBuffer;
// The first time, the output is the same as the input
mCache.getHwcBuffer(inSlot, mBuffer1, &outSlot, &outBuffer);
EXPECT_EQ(expectedSlot, outSlot);
EXPECT_EQ(mBuffer1, outBuffer);
// The second time with the same buffer, the outBuffer is nullptr.
mCache.getHwcBuffer(inSlot, mBuffer1, &outSlot, &outBuffer);
EXPECT_EQ(expectedSlot, outSlot);
EXPECT_EQ(nullptr, outBuffer.get());
// With a new buffer, the outBuffer is the input.
mCache.getHwcBuffer(inSlot, mBuffer2, &outSlot, &outBuffer);
EXPECT_EQ(expectedSlot, outSlot);
EXPECT_EQ(mBuffer2, outBuffer);
// Again, the second request with the same buffer sets outBuffer to nullptr.
mCache.getHwcBuffer(inSlot, mBuffer2, &outSlot, &outBuffer);
EXPECT_EQ(expectedSlot, outSlot);
EXPECT_EQ(nullptr, outBuffer.get());
// Setting a slot to use nullptr lookslike works, but note that
// the output values make it look like no new buffer is being set....
mCache.getHwcBuffer(inSlot, sp<GraphicBuffer>(), &outSlot, &outBuffer);
EXPECT_EQ(expectedSlot, outSlot);
EXPECT_EQ(nullptr, outBuffer.get());
}
impl::HwcBufferCache mCache;
sp<GraphicBuffer> mBuffer1{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
sp<GraphicBuffer> mBuffer2{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
};
TEST_F(HwcBufferCacheTest, cacheWorksForSlotZero) {
testSlot(0, 0);
}
TEST_F(HwcBufferCacheTest, cacheWorksForMaxSlot) {
testSlot(BufferQueue::NUM_BUFFER_SLOTS - 1, BufferQueue::NUM_BUFFER_SLOTS - 1);
}
TEST_F(HwcBufferCacheTest, cacheMapsNegativeSlotToZero) {
testSlot(-123, 0);
}
} // namespace
} // namespace android::compositionengine
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