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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 "HWComposerBufferCache.h"
#include <gui/BufferQueue.h>
namespace android {
HWComposerBufferCache::HWComposerBufferCache()
{
mBuffers.reserve(BufferQueue::NUM_BUFFER_SLOTS);
}
void HWComposerBufferCache::getHwcBuffer(int slot,
const sp<GraphicBuffer>& buffer,
uint32_t* outSlot, sp<GraphicBuffer>* outBuffer)
{
if (slot == BufferQueue::INVALID_BUFFER_SLOT || slot < 0) {
// default to slot 0
slot = 0;
}
if (static_cast<size_t>(slot) >= mBuffers.size()) {
mBuffers.resize(slot + 1);
}
*outSlot = slot;
if (mBuffers[slot] == buffer) {
// already cached in HWC, skip sending the buffer
*outBuffer = nullptr;
} else {
*outBuffer = buffer;
// update cache
mBuffers[slot] = buffer;
}
}
} // namespace android
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