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Diffstat (limited to 'services/surfaceflinger/Fps.h')
| -rw-r--r-- | services/surfaceflinger/Fps.h | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/services/surfaceflinger/Fps.h b/services/surfaceflinger/Fps.h deleted file mode 100644 index e9f06e5519..0000000000 --- a/services/surfaceflinger/Fps.h +++ /dev/null @@ -1,112 +0,0 @@ -/* - * Copyright (C) 2020 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. - */ - -#pragma once - -#include <cmath> -#include <ostream> -#include <string> - -#include <android-base/stringprintf.h> -#include <utils/Timers.h> - -namespace android { - -// Value which represents "frames per second". This class is a wrapper around -// float, providing some useful utilities, such as comparisons with tolerance -// and converting between period duration and frequency. -class Fps { -public: - static constexpr Fps fromPeriodNsecs(nsecs_t period) { return Fps(1e9f / period, period); } - - Fps() = default; - explicit constexpr Fps(float fps) - : fps(fps), period(fps == 0.0f ? 0 : static_cast<nsecs_t>(1e9f / fps)) {} - - constexpr float getValue() const { return fps; } - - constexpr nsecs_t getPeriodNsecs() const { return period; } - - bool equalsWithMargin(const Fps& other) const { return std::abs(fps - other.fps) < kMargin; } - - // DO NOT use for std::sort. Instead use comparesLess(). - bool lessThanWithMargin(const Fps& other) const { return fps + kMargin < other.fps; } - - bool greaterThanWithMargin(const Fps& other) const { return fps > other.fps + kMargin; } - - bool lessThanOrEqualWithMargin(const Fps& other) const { return !greaterThanWithMargin(other); } - - bool greaterThanOrEqualWithMargin(const Fps& other) const { return !lessThanWithMargin(other); } - - bool isValid() const { return fps > 0.0f; } - - int getIntValue() const { return static_cast<int>(std::round(fps)); } - - // Use this comparator for sorting. Using a comparator with margins can - // cause std::sort to crash. - inline static bool comparesLess(const Fps& left, const Fps& right) { - return left.fps < right.fps; - } - - // Compares two FPS with margin. - // Transitivity is not guaranteed, i.e. a==b and b==c doesn't imply a==c. - // DO NOT use with hash maps. Instead use EqualsInBuckets. - struct EqualsWithMargin { - bool operator()(const Fps& left, const Fps& right) const { - return left.equalsWithMargin(right); - } - }; - - // Equals comparator which can be used with hash maps. - // It's guaranteed that if two elements are equal, then their hashes are equal. - struct EqualsInBuckets { - bool operator()(const Fps& left, const Fps& right) const { - return left.getBucket() == right.getBucket(); - } - }; - - inline friend std::string to_string(const Fps& fps) { - return base::StringPrintf("%.2ffps", fps.fps); - } - - inline friend std::ostream& operator<<(std::ostream& os, const Fps& fps) { - return os << to_string(fps); - } - -private: - friend std::hash<android::Fps>; - - constexpr Fps(float fps, nsecs_t period) : fps(fps), period(period) {} - - float getBucket() const { return std::round(fps / kMargin); } - - static constexpr float kMargin = 0.001f; - float fps = 0; - nsecs_t period = 0; -}; - -static_assert(std::is_trivially_copyable_v<Fps>); - -} // namespace android - -namespace std { -template <> -struct hash<android::Fps> { - std::size_t operator()(const android::Fps& fps) const { - return std::hash<float>()(fps.getBucket()); - } -}; -} // namespace std
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