1 /* 2 * Copyright 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <android-base/thread_annotations.h> 20 #include <android/gui/IHdrLayerInfoListener.h> 21 #include <binder/IBinder.h> 22 23 #include <unordered_map> 24 25 #include "WpHash.h" 26 27 namespace android { 28 29 class HdrLayerInfoReporter final : public IBinder::DeathRecipient { 30 public: 31 struct HdrLayerInfo { 32 int32_t numberOfHdrLayers = 0; 33 int32_t maxW = 0; 34 int32_t maxH = 0; 35 int32_t flags = 0; 36 // Counter-intuitively a value of "1" means "as much as you can give me" due to "1" being 37 // the default value for all layers, so any HDR layer with a value of 1.f means no 38 // reduced maximum has been requested 39 // TODO: Should the max desired ratio have a better meaning for HLG/PQ so this can be 40 // eliminated? If we assume an SDR white point of even just 100 nits for those content 41 // then HLG could have a meaningful max ratio of 10.f and PQ of 100.f instead of needing 42 // to treat 1.f as "uncapped" 43 // With peak display brightnesses exceeding 1,000 nits currently, HLG's request could 44 // actually be satisfied in some ambient conditions such that limiting that max for that 45 // content in theory makes sense 46 float maxDesiredHdrSdrRatio = 0.f; 47 48 bool operator==(const HdrLayerInfo& other) const { 49 return numberOfHdrLayers == other.numberOfHdrLayers && maxW == other.maxW && 50 maxH == other.maxH && flags == other.flags && 51 maxDesiredHdrSdrRatio == other.maxDesiredHdrSdrRatio; 52 } 53 54 bool operator!=(const HdrLayerInfo& other) const { return !(*this == other); } 55 mergeDesiredRatioHdrLayerInfo56 void mergeDesiredRatio(float update) { 57 maxDesiredHdrSdrRatio = std::max(maxDesiredHdrSdrRatio, update); 58 } 59 }; 60 61 HdrLayerInfoReporter() = default; 62 ~HdrLayerInfoReporter() final = default; 63 64 // Dispatches updated layer fps values for the registered listeners 65 // This method promotes Layer weak pointers and performs layer stack traversals, so mStateLock 66 // must be held when calling this method. 67 void dispatchHdrLayerInfo(const HdrLayerInfo& info) EXCLUDES(mMutex); 68 69 // Override for IBinder::DeathRecipient 70 void binderDied(const wp<IBinder>&) override EXCLUDES(mMutex); 71 72 // Registers an Fps listener that listens to fps updates for the provided layer 73 void addListener(const sp<gui::IHdrLayerInfoListener>& listener) EXCLUDES(mMutex); 74 // Deregisters an Fps listener 75 void removeListener(const sp<gui::IHdrLayerInfoListener>& listener) EXCLUDES(mMutex); 76 hasListeners()77 bool hasListeners() const EXCLUDES(mMutex) { 78 std::scoped_lock lock(mMutex); 79 return !mListeners.empty(); 80 } 81 82 private: 83 mutable std::mutex mMutex; 84 85 struct TrackedListener { 86 sp<gui::IHdrLayerInfoListener> listener; 87 HdrLayerInfo lastInfo; 88 }; 89 90 std::unordered_map<wp<IBinder>, TrackedListener, WpHash> mListeners GUARDED_BY(mMutex); 91 }; 92 93 } // namespace android