| /* |
| * Copyright 2018 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 "LayerHistory.h" |
| |
| #include <cinttypes> |
| #include <cstdint> |
| #include <numeric> |
| #include <string> |
| #include <unordered_map> |
| |
| #include <utils/Log.h> |
| #include <utils/Timers.h> |
| #include <utils/Trace.h> |
| |
| #include "SchedulerUtils.h" |
| |
| namespace android { |
| |
| LayerHistory::LayerHistory() {} |
| |
| LayerHistory::~LayerHistory() = default; |
| |
| void LayerHistory::insert(const std::string layerName, nsecs_t presentTime) { |
| mElements[mCounter].insert(std::make_pair(layerName, presentTime)); |
| } |
| |
| void LayerHistory::incrementCounter() { |
| mCounter++; |
| mCounter = mCounter % scheduler::ARRAY_SIZE; |
| // Clear all the previous data from the history. This is a ring buffer, so we are |
| // reusing memory. |
| mElements[mCounter].clear(); |
| } |
| |
| const std::unordered_map<std::string, nsecs_t>& LayerHistory::get(size_t index) const { |
| // For the purposes of the layer history, the index = 0 always needs to start at the |
| // current counter, and then decrement to access the layers in correct historical order. |
| return mElements.at((scheduler::ARRAY_SIZE + (mCounter - (index % scheduler::ARRAY_SIZE))) % |
| scheduler::ARRAY_SIZE); |
| } |
| |
| } // namespace android |