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/*
* Copyright (C) 2017 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>
// TODO(b/129481165): remove the #pragma below and fix conversion issues
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wconversion"
#include <gui/BufferQueue.h>
#include <ui/GraphicBuffer.h>
// TODO(b/129481165): remove the #pragma below and fix conversion issues
#pragma clang diagnostic pop // ignored "-Wconversion"
namespace android::compositionengine::impl {
HwcBufferCache::HwcBufferCache() {
std::fill(std::begin(mBuffers), std::end(mBuffers), wp<GraphicBuffer>(nullptr));
}
void HwcBufferCache::getHwcBuffer(int slot, const sp<GraphicBuffer>& buffer, uint32_t* outSlot,
sp<GraphicBuffer>* outBuffer) {
// default is 0
if (slot == BufferQueue::INVALID_BUFFER_SLOT || slot < 0 ||
slot >= static_cast<int32_t>(kMaxLayerBufferCount)) {
*outSlot = 0;
} else {
*outSlot = static_cast<uint32_t>(slot);
}
auto& currentBuffer = mBuffers[*outSlot];
wp<GraphicBuffer> weakCopy(buffer);
if (currentBuffer == weakCopy) {
// already cached in HWC, skip sending the buffer
*outBuffer = nullptr;
} else {
*outBuffer = buffer;
// update cache
currentBuffer = buffer;
}
}
} // namespace android::compositionengine::impl
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