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/*
* Copyright 2021 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 <android-base/thread_annotations.h>
#include <android/gui/IHdrLayerInfoListener.h>
#include <binder/IBinder.h>
#include <utils/Timers.h>
#include <unordered_map>
#include "Utils/RingBuffer.h"
#include "WpHash.h"
namespace android {
class HdrLayerInfoReporter final : public IBinder::DeathRecipient {
public:
struct HdrLayerInfo {
int32_t numberOfHdrLayers = 0;
int32_t maxW = 0;
int32_t maxH = 0;
int32_t flags = 0;
// Counter-intuitively a value of "1" means "as much as you can give me" due to "1" being
// the default value for all layers, so any HDR layer with a value of 1.f means no
// reduced maximum has been requested
// TODO: Should the max desired ratio have a better meaning for HLG/PQ so this can be
// eliminated? If we assume an SDR white point of even just 100 nits for those content
// then HLG could have a meaningful max ratio of 10.f and PQ of 100.f instead of needing
// to treat 1.f as "uncapped"
// With peak display brightnesses exceeding 1,000 nits currently, HLG's request could
// actually be satisfied in some ambient conditions such that limiting that max for that
// content in theory makes sense
float maxDesiredHdrSdrRatio = 0.f;
bool operator==(const HdrLayerInfo& other) const {
return numberOfHdrLayers == other.numberOfHdrLayers && maxW == other.maxW &&
maxH == other.maxH && flags == other.flags &&
maxDesiredHdrSdrRatio == other.maxDesiredHdrSdrRatio;
}
bool operator!=(const HdrLayerInfo& other) const { return !(*this == other); }
void mergeDesiredRatio(float update) {
maxDesiredHdrSdrRatio = std::max(maxDesiredHdrSdrRatio, update);
}
};
HdrLayerInfoReporter() = default;
~HdrLayerInfoReporter() final = default;
// Dispatches updated layer fps values for the registered listeners
// This method promotes Layer weak pointers and performs layer stack traversals, so mStateLock
// must be held when calling this method.
void dispatchHdrLayerInfo(const HdrLayerInfo& info) EXCLUDES(mMutex);
// Override for IBinder::DeathRecipient
void binderDied(const wp<IBinder>&) override EXCLUDES(mMutex);
// Registers an Fps listener that listens to fps updates for the provided layer
void addListener(const sp<gui::IHdrLayerInfoListener>& listener) EXCLUDES(mMutex);
// Deregisters an Fps listener
void removeListener(const sp<gui::IHdrLayerInfoListener>& listener) EXCLUDES(mMutex);
bool hasListeners() const EXCLUDES(mMutex) {
std::scoped_lock lock(mMutex);
return !mListeners.empty();
}
void dump(std::string& result) const;
private:
mutable std::mutex mMutex;
struct TrackedListener {
sp<gui::IHdrLayerInfoListener> listener;
HdrLayerInfo lastInfo;
};
std::unordered_map<wp<IBinder>, TrackedListener, WpHash> mListeners GUARDED_BY(mMutex);
struct EventHistoryEntry {
nsecs_t timestamp = -1;
HdrLayerInfo info;
EventHistoryEntry() {}
EventHistoryEntry(const HdrLayerInfo& info) : info(info) { timestamp = systemTime(); }
};
utils::RingBuffer<EventHistoryEntry, 32> mHdrInfoHistory;
};
} // namespace android
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