| /* |
| * 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 |