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/*
* Copyright 2019 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 <binder/IBinder.h>
#include <gui/LayerState.h>
#include <renderengine/RenderEngine.h>
#include <ui/GraphicBuffer.h>
#include <utils/RefBase.h>
#include <utils/Singleton.h>
#include <map>
#include <mutex>
#include <set>
#include <unordered_map>
// 4096 is based on 64 buffers * 64 layers. Once this limit is reached, the least recently used
// buffer is uncached before the new buffer is cached.
#define BUFFER_CACHE_MAX_SIZE 4096
namespace android {
// This class manages a cache of buffer handles between SurfaceFlinger clients
// and the SurfaceFlinger process which optimizes away some of the cost of
// sending buffer handles across processes.
//
// Buffers are explicitly cached and uncached by the SurfaceFlinger client. When
// a buffer is uncached, it is not only purged from this cache, but the buffer
// ID is also passed down to CompositionEngine to purge it from a similar cache
// used between SurfaceFlinger and Composer HAL. The buffer ID used to purge
// both the SurfaceFlinger side of this other cache, as well as Composer HAL's
// side of the cache.
//
class ClientCache : public Singleton<ClientCache> {
public:
ClientCache();
enum class AddError { CacheFull, Unspecified };
base::expected<std::shared_ptr<renderengine::ExternalTexture>, AddError> add(
const client_cache_t& cacheId, const sp<GraphicBuffer>& buffer);
sp<GraphicBuffer> erase(const client_cache_t& cacheId);
std::shared_ptr<renderengine::ExternalTexture> get(const client_cache_t& cacheId);
// Always called immediately after setup. Will be set to non-null, and then should never be
// called again.
void setRenderEngine(renderengine::RenderEngine* renderEngine) { mRenderEngine = renderEngine; }
void removeProcess(const wp<IBinder>& processToken);
class ErasedRecipient : public virtual RefBase {
public:
virtual void bufferErased(const client_cache_t& clientCacheId) = 0;
};
bool registerErasedRecipient(const client_cache_t& cacheId,
const wp<ErasedRecipient>& recipient);
void unregisterErasedRecipient(const client_cache_t& cacheId,
const wp<ErasedRecipient>& recipient);
void dump(std::string& result);
private:
std::mutex mMutex;
struct ClientCacheBuffer {
std::shared_ptr<renderengine::ExternalTexture> buffer;
std::set<wp<ErasedRecipient>> recipients;
};
std::map<wp<IBinder> /*caching process*/,
std::pair<sp<IBinder> /*strong ref to caching process*/,
std::unordered_map<uint64_t /*cache id*/, ClientCacheBuffer>>>
mBuffers GUARDED_BY(mMutex);
class CacheDeathRecipient : public IBinder::DeathRecipient {
public:
void binderDied(const wp<IBinder>& who) override;
};
sp<CacheDeathRecipient> mDeathRecipient;
renderengine::RenderEngine* mRenderEngine = nullptr;
bool getBuffer(const client_cache_t& cacheId, ClientCacheBuffer** outClientCacheBuffer)
REQUIRES(mMutex);
};
}; // namespace android
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