| /* |
| * Copyright (C) 2015 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. |
| */ |
| #ifndef RINGBUFFER_H_ |
| #define RINGBUFFER_H_ |
| |
| #include "utils/Macros.h" |
| |
| #include <stddef.h> |
| |
| namespace android { |
| namespace uirenderer { |
| |
| template<class T, size_t SIZE> |
| class RingBuffer { |
| PREVENT_COPY_AND_ASSIGN(RingBuffer); |
| |
| public: |
| RingBuffer() {} |
| ~RingBuffer() {} |
| |
| constexpr size_t capacity() const { return SIZE; } |
| size_t size() { return mCount; } |
| |
| T& next() { |
| mHead = (mHead + 1) % SIZE; |
| if (mCount < SIZE) { |
| mCount++; |
| } |
| return mBuffer[mHead]; |
| } |
| |
| T& front() { |
| return (*this)[0]; |
| } |
| |
| T& back() { |
| return (*this)[size() - 1]; |
| } |
| |
| T& operator[](size_t index) { |
| return mBuffer[(mHead + index + 1) % mCount]; |
| } |
| |
| void clear() { |
| mCount = 0; |
| mHead = -1; |
| } |
| |
| private: |
| T mBuffer[SIZE]; |
| int mHead = -1; |
| size_t mCount = 0; |
| }; |
| |
| }; // namespace uirenderer |
| }; // namespace android |
| |
| #endif /* RINGBUFFER_H_ */ |