Remove libbufferhubqueue, libdisplay and dependencies

        "libutils",

        "libnativewindow",

        "libvndksupport",

        "libbufferhubqueue",

    ],

    header_libs: [

        "libdvr_headers",

// Copyright (C) 2016 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.

package {

    // See: http://go/android-license-faq

    // A large-scale-change added 'default_applicable_licenses' to import

    // all of the 'license_kinds' from "frameworks_native_license"

    // to get the below license kinds:

    //   SPDX-license-identifier-Apache-2.0

    default_applicable_licenses: ["frameworks_native_license"],

}

sourceFiles = [

    "buffer_hub_queue_client.cpp",

    "buffer_hub_queue_parcelable.cpp",

]

includeFiles = [

    "include",

]

staticLibraries = [

    "libbufferhub",

]

sharedLibraries = [

    "libbinder",

    "libcutils",

    "liblog",

    "libui",

    "libutils",

    "libpdx_default_transport",

]

headerLibraries = [

    "libdvr_headers",

    "libnativebase_headers",

]

cc_library_shared {

    name: "libbufferhubqueue",

    cflags: [

        "-DLOG_TAG=\"libbufferhubqueue\"",

        "-DTRACE=0",

        "-DATRACE_TAG=ATRACE_TAG_GRAPHICS",

        "-Wall",

        "-Werror",

        "-Wno-format",

        "-Wno-unused-parameter",

        "-Wno-unused-variable",

    ],

    srcs: sourceFiles,

    export_include_dirs: includeFiles,

    export_static_lib_headers: staticLibraries,

    static_libs: staticLibraries,

    shared_libs: sharedLibraries,

    header_libs: headerLibraries,

}

subdirs = ["benchmarks", "tests"]

#include "include/private/dvr/buffer_hub_queue_parcelable.h"

#include <binder/Parcel.h>

#include <pdx/default_transport/channel_parcelable.h>

namespace android {

namespace dvr {

template <BufferHubQueueParcelableMagic Magic>

bool BufferHubQueueParcelable<Magic>::IsValid() const {

  return !!channel_parcelable_ && channel_parcelable_->IsValid();

}

template <BufferHubQueueParcelableMagic Magic>

pdx::LocalChannelHandle BufferHubQueueParcelable<Magic>::TakeChannelHandle() {

  if (!IsValid()) {

    ALOGE(

        "BufferHubQueueParcelable::TakeChannelHandle: Invalid channel parcel.");

    return {};  // Returns an empty channel handle.

  }

  // Take channel handle out of the parcelable and reset the parcelable.

  pdx::LocalChannelHandle handle = channel_parcelable_->TakeChannelHandle();

  // Now channel_parcelable_ should already be invalid, but reset it to release

  // the invalid parcelable object from unique_ptr.

  channel_parcelable_ = nullptr;

  return handle;

}

template <BufferHubQueueParcelableMagic Magic>

status_t BufferHubQueueParcelable<Magic>::writeToParcel(Parcel* parcel) const {

  if (!IsValid()) {

    ALOGE("BufferHubQueueParcelable::writeToParcel: Invalid channel.");

    return -EINVAL;

  }

  status_t res = parcel->writeUint32(Magic);

  if (res != OK) {

    ALOGE("BufferHubQueueParcelable::writeToParcel: Cannot write magic.");

    return res;

  }

  return channel_parcelable_->writeToParcel(parcel);

}

template <BufferHubQueueParcelableMagic Magic>

status_t BufferHubQueueParcelable<Magic>::readFromParcel(const Parcel* parcel) {

  if (IsValid()) {

    ALOGE(

        "BufferHubQueueParcelable::readFromParcel: This parcelable object has "

        "been initialized already.");

    return -EINVAL;

  }

  uint32_t out_magic = 0;

  status_t res = OK;

  res = parcel->readUint32(&out_magic);

  if (res != OK)

    return res;

  if (out_magic != Magic) {

    ALOGE(

        "BufferHubQueueParcelable::readFromParcel: Unexpected magic: 0x%x, "

        "epxected: 0x%x",

        out_magic, Magic);

    return -EINVAL;

  }

  // (Re)Alocate channel parcelable object.

  channel_parcelable_ =

      std::make_unique<pdx::default_transport::ChannelParcelable>();

  return channel_parcelable_->readFromParcel(parcel);

}

template class BufferHubQueueParcelable<

    BufferHubQueueParcelableMagic::Producer>;

template class BufferHubQueueParcelable<

    BufferHubQueueParcelableMagic::Consumer>;

}  // namespace dvr

}  // namespace android

#ifndef ANDROID_DVR_BUFFER_HUB_QUEUE_CLIENT_H_

#define ANDROID_DVR_BUFFER_HUB_QUEUE_CLIENT_H_

#include <ui/BufferQueueDefs.h>

#if defined(__clang__)

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Weverything"

#endif

// The following headers are included without checking every warning.

// TODO(b/72172820): Remove the workaround once we have enforced -Weverything

// in these headers and their dependencies.

#include <pdx/client.h>

#include <pdx/status.h>

#include <private/dvr/buffer_hub_queue_parcelable.h>

#include <private/dvr/bufferhub_rpc.h>

#include <private/dvr/consumer_buffer.h>

#include <private/dvr/epoll_file_descriptor.h>

#include <private/dvr/producer_buffer.h>

#if defined(__clang__)

#pragma clang diagnostic pop

#endif

#include <memory>

#include <queue>

#include <vector>

namespace android {

namespace dvr {

class ConsumerQueue;

// |BufferHubQueue| manages a queue of |BufferHubBase|s. Buffers are

// automatically re-requeued when released by the remote side.

class BufferHubQueue : public pdx::Client {

 public:

  using BufferAvailableCallback = std::function<void()>;

  using BufferRemovedCallback =

      std::function<void(const std::shared_ptr<BufferHubBase>&)>;

  virtual ~BufferHubQueue() {}

  // Creates a new consumer queue that is attached to the producer. Returns

  // a new consumer queue client or nullptr on failure.

  std::unique_ptr<ConsumerQueue> CreateConsumerQueue();

  // Creates a new consumer queue that is attached to the producer. This queue

  // sets each of its imported consumer buffers to the ignored state to avoid

  // participation in lifecycle events.

  std::unique_ptr<ConsumerQueue> CreateSilentConsumerQueue();

  // Returns whether the buffer queue is in async mode.

  bool is_async() const { return is_async_; }

  // Returns the default buffer width of this buffer queue.

  uint32_t default_width() const { return default_width_; }

  // Returns the default buffer height of this buffer queue.

  uint32_t default_height() const { return default_height_; }

  // Returns the default buffer format of this buffer queue.

  uint32_t default_format() const { return default_format_; }

  // Creates a new consumer in handle form for immediate transport over RPC.

  pdx::Status<pdx::LocalChannelHandle> CreateConsumerQueueHandle(

      bool silent = false);

  // Creates a new consumer in parcelable form for immediate transport over

  // Binder.

  pdx::Status<ConsumerQueueParcelable> CreateConsumerQueueParcelable(

      bool silent = false);

  // Returns the number of buffers avaiable for dequeue.

  size_t count() const { return available_buffers_.size(); }

  // Returns the total number of buffers that the queue is tracking.

  size_t capacity() const { return capacity_; }

  // Returns the size of metadata structure associated with this queue.

  size_t metadata_size() const { return user_metadata_size_; }

  // Returns whether the buffer queue is full.

  bool is_full() const {

    return available_buffers_.size() >= kMaxQueueCapacity;

  }

  // Returns whether the buffer queue is connected to bufferhubd.

  bool is_connected() const { return !!GetChannel(); }

  int GetBufferId(size_t slot) const {

    return (slot < buffers_.size() && buffers_[slot]) ? buffers_[slot]->id()

                                                      : -1;

  }

  std::shared_ptr<BufferHubBase> GetBuffer(size_t slot) const {

    return buffers_[slot];

  }

  pdx::Status<int> GetEventMask(int events) {

    if (auto* client_channel = GetChannel()) {

      return client_channel->GetEventMask(events);

    } else {

      return pdx::ErrorStatus(EINVAL);

    }

  }

  // Returns an fd that signals pending queue events using

  // EPOLLIN/POLLIN/readible. Either HandleQueueEvents or WaitForBuffers may be

  // called to handle pending queue events.

  int queue_fd() const { return epoll_fd_.Get(); }

  // Handles any pending events, returning available buffers to the queue and

  // reaping disconnected buffers. Returns true if successful, false if an error

  // occurred.

  bool HandleQueueEvents() { return WaitForBuffers(0); }

  // Set buffer event callbacks, which are std::function wrappers. The caller is

  // responsible for ensuring the validity of these callbacks' callable targets.

  void SetBufferAvailableCallback(BufferAvailableCallback callback);

  void SetBufferRemovedCallback(BufferRemovedCallback callback);

  // The queue tracks at most this many buffers.

  static constexpr size_t kMaxQueueCapacity =

      android::BufferQueueDefs::NUM_BUFFER_SLOTS;

  static constexpr int kNoTimeOut = -1;

  int id() const { return id_; }

  bool hung_up() const { return hung_up_; }

 protected:

  explicit BufferHubQueue(pdx::LocalChannelHandle channel);

  explicit BufferHubQueue(const std::string& endpoint_path);

  // Imports the queue parameters by querying BufferHub for the parameters for

  // this channel.

  pdx::Status<void> ImportQueue();

  // Sets up the queue with the given parameters.

  void SetupQueue(const QueueInfo& queue_info);

  // Register a buffer for management by the queue. Used by subclasses to add a

  // buffer to internal bookkeeping.

  pdx::Status<void> AddBuffer(const std::shared_ptr<BufferHubBase>& buffer,

                              size_t slot);

  // Called by ProducerQueue::RemoveBuffer and ConsumerQueue::RemoveBuffer only

  // to deregister a buffer for epoll and internal bookkeeping.

  virtual pdx::Status<void> RemoveBuffer(size_t slot);

  // Free all buffers that belongs to this queue. Can only be called from

  // producer side.

  virtual pdx::Status<void> FreeAllBuffers();

  // Dequeue a buffer from the free queue, blocking until one is available. The

  // timeout argument specifies the number of milliseconds that |Dequeue()| will

  // block. Specifying a timeout of -1 causes Dequeue() to block indefinitely,

  // while specifying a timeout equal to zero cause Dequeue() to return

  // immediately, even if no buffers are available.

  pdx::Status<std::shared_ptr<BufferHubBase>> Dequeue(int timeout,

                                                      size_t* slot);

  // Waits for buffers to become available and adds them to the available queue.

  bool WaitForBuffers(int timeout);

  pdx::Status<void> HandleBufferEvent(size_t slot, int event_fd,

                                      int poll_events);

  pdx::Status<void> HandleQueueEvent(int poll_events);

  // Entry in the priority queue of available buffers that stores related

  // per-buffer data.

  struct Entry {

    Entry() : slot(0) {}

    Entry(const std::shared_ptr<BufferHubBase>& in_buffer, size_t in_slot,

          uint64_t in_index)

        : buffer(in_buffer), slot(in_slot), index(in_index) {}

    Entry(const std::shared_ptr<BufferHubBase>& in_buffer,

          std::unique_ptr<uint8_t[]> in_metadata, pdx::LocalHandle in_fence,

          size_t in_slot)

        : buffer(in_buffer),

          metadata(std::move(in_metadata)),

          fence(std::move(in_fence)),

          slot(in_slot) {}

    Entry(Entry&&) = default;

    Entry& operator=(Entry&&) = default;

    std::shared_ptr<BufferHubBase> buffer;

    std::unique_ptr<uint8_t[]> metadata;

    pdx::LocalHandle fence;

    size_t slot;

    uint64_t index;

  };

  struct EntryComparator {

    bool operator()(const Entry& lhs, const Entry& rhs) {

      return lhs.index > rhs.index;

    }

  };

  // Enqueues a buffer to the available list (Gained for producer or Acquireed

  // for consumer).

  pdx::Status<void> Enqueue(Entry entry);

  // Called when a buffer is allocated remotely.

  virtual pdx::Status<void> OnBufferAllocated() { return {}; }

  // Size of the metadata that buffers in this queue cary.

  size_t user_metadata_size_{0};

  // Buffers and related data that are available for dequeue.

  std::priority_queue<Entry, std::vector<Entry>, EntryComparator>

      available_buffers_;

  // Slot of the buffers that are not available for normal dequeue. For example,

  // the slot of posted or acquired buffers in the perspective of a producer.

  std::vector<size_t> unavailable_buffers_slot_;

 private:

  void Initialize();

  // Special epoll data field indicating that the epoll event refers to the

  // queue.

  static constexpr int64_t kEpollQueueEventIndex = -1;

  static constexpr size_t kMaxEvents = 128;

  // The u64 data field of an epoll event is interpreted as int64_t:

  // When |index| >= 0 and |index| < kMaxQueueCapacity it refers to a specific

  // element of |buffers_| as a direct index;

  static bool is_buffer_event_index(int64_t index) {

    return index >= 0 &&

           index < static_cast<int64_t>(BufferHubQueue::kMaxQueueCapacity);

  }

  // When |index| == kEpollQueueEventIndex it refers to the queue itself.

  static bool is_queue_event_index(int64_t index) {

    return index == BufferHubQueue::kEpollQueueEventIndex;

  }

  // Whether the buffer queue is operating in Async mode.

  // From GVR's perspective of view, this means a buffer can be acquired

  // asynchronously by the compositor.

  // From Android Surface's perspective of view, this is equivalent to

  // IGraphicBufferProducer's async mode. When in async mode, a producer

  // will never block even if consumer is running slow.

  bool is_async_{false};

  // Default buffer width that is set during ProducerQueue's creation.

  uint32_t default_width_{1};

  // Default buffer height that is set during ProducerQueue's creation.

  uint32_t default_height_{1};

  // Default buffer format that is set during ProducerQueue's creation.

  uint32_t default_format_{1};  // PIXEL_FORMAT_RGBA_8888

  // Tracks the buffers belonging to this queue. Buffers are stored according to

  // "slot" in this vector. Each slot is a logical id of the buffer within this

  // queue regardless of its queue position or presence in the ring buffer.

  std::array<std::shared_ptr<BufferHubBase>, kMaxQueueCapacity> buffers_;

  // Keeps track with how many buffers have been added into the queue.

  size_t capacity_{0};

  // Epoll fd used to manage buffer events.

  EpollFileDescriptor epoll_fd_;

  // Flag indicating that the other side hung up. For ProducerQueues this

  // triggers when BufferHub dies or explicitly closes the queue channel. For

  // ConsumerQueues this can either mean the same or that the ProducerQueue on

  // the other end hung up.

  bool hung_up_{false};

  // Global id for the queue that is consistent across processes.

  int id_{-1};

  // Buffer event callbacks

  BufferAvailableCallback on_buffer_available_;

  BufferRemovedCallback on_buffer_removed_;

  BufferHubQueue(const BufferHubQueue&) = delete;

  void operator=(BufferHubQueue&) = delete;

};

class ProducerQueue : public pdx::ClientBase<ProducerQueue, BufferHubQueue> {

 public:

  // Usage bits in |usage_set_mask| will be automatically masked on. Usage bits

  // in |usage_clear_mask| will be automatically masked off. Note that

  // |usage_set_mask| and |usage_clear_mask| may conflict with each other, but

  // |usage_set_mask| takes precedence over |usage_clear_mask|. All buffer

  // allocation through this producer queue shall not have any of the usage bits

  // in |usage_deny_set_mask| set. Allocation calls violating this will be

  // rejected. All buffer allocation through this producer queue must have all

  // the usage bits in |usage_deny_clear_mask| set. Allocation calls violating

  // this will be rejected. Note that |usage_deny_set_mask| and

  // |usage_deny_clear_mask| shall not conflict with each other. Such

  // configuration will be treated as invalid input on creation.

  static std::unique_ptr<ProducerQueue> Create(

      const ProducerQueueConfig& config, const UsagePolicy& usage) {

    return BASE::Create(config, usage);

  }

  // Import a ProducerQueue from a channel handle.

  static std::unique_ptr<ProducerQueue> Import(pdx::LocalChannelHandle handle) {

    return BASE::Create(std::move(handle));

  }

  // Get a producer buffer. Note that the method doesn't check whether the

  // buffer slot has a valid buffer that has been allocated already. When no

  // buffer has been imported before it returns nullptr; otherwise it returns

  // a shared pointer to a ProducerBuffer.

  std::shared_ptr<ProducerBuffer> GetBuffer(size_t slot) const {

    return std::static_pointer_cast<ProducerBuffer>(

        BufferHubQueue::GetBuffer(slot));

  }

  // Batch allocate buffers. Once allocated, producer buffers are automatically

  // enqueue'd into the ProducerQueue and available to use (i.e. in GAINED

  // state). Upon success, returns a list of slots for each buffer allocated.

  pdx::Status<std::vector<size_t>> AllocateBuffers(

      uint32_t width, uint32_t height, uint32_t layer_count, uint32_t format,

      uint64_t usage, size_t buffer_count);

  // Allocate producer buffer to populate the queue. Once allocated, a producer

  // buffer is automatically enqueue'd into the ProducerQueue and available to

  // use (i.e. in GAINED state). Upon success, returns the slot number for the

  // buffer allocated.

  pdx::Status<size_t> AllocateBuffer(uint32_t width, uint32_t height,

                                     uint32_t layer_count, uint32_t format,

                                     uint64_t usage);

  // Add a producer buffer to populate the queue. Once added, a producer buffer

  // is available to use (i.e. in GAINED state).

  pdx::Status<void> AddBuffer(const std::shared_ptr<ProducerBuffer>& buffer,

                              size_t slot);

  // Inserts a ProducerBuffer into the queue. On success, the method returns the

  // |slot| number where the new buffer gets inserted. Note that the buffer

  // being inserted should be in Gain'ed state prior to the call and it's

  // considered as already Dequeued when the function returns.

  pdx::Status<size_t> InsertBuffer(

      const std::shared_ptr<ProducerBuffer>& buffer);

  // Remove producer buffer from the queue.

  pdx::Status<void> RemoveBuffer(size_t slot) override;

  // Free all buffers on this producer queue.

  pdx::Status<void> FreeAllBuffers() override {

    return BufferHubQueue::FreeAllBuffers();

  }

  // Dequeue a producer buffer to write. The returned buffer in |Gain|'ed mode,

  // and caller should call Post() once it's done writing to release the buffer

  // to the consumer side.

  // @return a buffer in gained state, which was originally in released state.

  pdx::Status<std::shared_ptr<ProducerBuffer>> Dequeue(

      int timeout, size_t* slot, pdx::LocalHandle* release_fence);

  // Dequeue a producer buffer to write. The returned buffer in |Gain|'ed mode,

  // and caller should call Post() once it's done writing to release the buffer

  // to the consumer side.

  //

  // @param timeout to dequeue a buffer.

  // @param slot is the slot of the output ProducerBuffer.

  // @param release_fence for gaining a buffer.

  // @param out_meta metadata of the output buffer.

  // @param gain_posted_buffer whether to gain posted buffer if no released

  //     buffer is available to gain.

  // @return a buffer in gained state, which was originally in released state if

  //     gain_posted_buffer is false, or in posted/released state if

  //     gain_posted_buffer is true.

  // TODO(b/112007999): gain_posted_buffer true is only used to prevent

  // libdvrtracking from starving when there are non-responding clients. This

  // gain_posted_buffer param can be removed once libdvrtracking start to use

  // the new AHardwareBuffer API.

  pdx::Status<std::shared_ptr<ProducerBuffer>> Dequeue(

      int timeout, size_t* slot, DvrNativeBufferMetadata* out_meta,

      pdx::LocalHandle* release_fence, bool gain_posted_buffer = false);

  // Enqueues a producer buffer in the queue.

  pdx::Status<void> Enqueue(const std::shared_ptr<ProducerBuffer>& buffer,

                            size_t slot, uint64_t index) {

    return BufferHubQueue::Enqueue({buffer, slot, index});

  }

  // Takes out the current producer queue as a binder parcelable object. Note

  // that the queue must be empty to be exportable. After successful export, the

  // producer queue client should no longer be used.

  pdx::Status<ProducerQueueParcelable> TakeAsParcelable();

 private:

  friend BASE;

  // Constructors are automatically exposed through ProducerQueue::Create(...)

  // static template methods inherited from ClientBase, which take the same

  // arguments as the constructors.

  explicit ProducerQueue(pdx::LocalChannelHandle handle);

  ProducerQueue(const ProducerQueueConfig& config, const UsagePolicy& usage);

  // Dequeue a producer buffer to write. The returned buffer in |Gain|'ed mode,

  // and caller should call Post() once it's done writing to release the buffer

  // to the consumer side.

  //

  // @param slot the slot of the returned buffer.

  // @return a buffer in gained state, which was originally in posted state or

  //     released state.

  pdx::Status<std::shared_ptr<ProducerBuffer>> DequeueUnacquiredBuffer(

      size_t* slot);

};

class ConsumerQueue : public BufferHubQueue {

 public:

  // Get a consumer buffer. Note that the method doesn't check whether the

  // buffer slot has a valid buffer that has been imported already. When no

  // buffer has been imported before it returns nullptr; otherwise returns a

  // shared pointer to a ConsumerBuffer.

  std::shared_ptr<ConsumerBuffer> GetBuffer(size_t slot) const {

    return std::static_pointer_cast<ConsumerBuffer>(

        BufferHubQueue::GetBuffer(slot));

  }

  // Import a ConsumerQueue from a channel handle. |ignore_on_import| controls

  // whether or not buffers are set to be ignored when imported. This may be

  // used to avoid participation in the buffer lifecycle by a consumer queue

  // that is only used to spawn other consumer queues, such as in an

  // intermediate service.

  static std::unique_ptr<ConsumerQueue> Import(pdx::LocalChannelHandle handle);

  // Import newly created buffers from the service side.

  // Returns number of buffers successfully imported or an error.

  pdx::Status<size_t> ImportBuffers();

  // Dequeue a consumer buffer to read. The returned buffer in |Acquired|'ed

  // mode, and caller should call Releasse() once it's done writing to release

  // the buffer to the producer side. |meta| is passed along from BufferHub,

  // The user of ProducerBuffer is responsible with making sure that the

  // Dequeue() is done with the corect metadata type and size with those used

  // when the buffer is orignally created.

  template <typename Meta>

  pdx::Status<std::shared_ptr<ConsumerBuffer>> Dequeue(

      int timeout, size_t* slot, Meta* meta, pdx::LocalHandle* acquire_fence) {

    return Dequeue(timeout, slot, meta, sizeof(*meta), acquire_fence);

  }

  pdx::Status<std::shared_ptr<ConsumerBuffer>> Dequeue(

      int timeout, size_t* slot, pdx::LocalHandle* acquire_fence) {

    return Dequeue(timeout, slot, nullptr, 0, acquire_fence);

  }

  pdx::Status<std::shared_ptr<ConsumerBuffer>> Dequeue(

      int timeout, size_t* slot, void* meta, size_t user_metadata_size,

      pdx::LocalHandle* acquire_fence);

  pdx::Status<std::shared_ptr<ConsumerBuffer>> Dequeue(

      int timeout, size_t* slot, DvrNativeBufferMetadata* out_meta,

      pdx::LocalHandle* acquire_fence);

 private:

  friend BufferHubQueue;

  explicit ConsumerQueue(pdx::LocalChannelHandle handle);

  // Add a consumer buffer to populate the queue. Once added, a consumer buffer

  // is NOT available to use until the producer side |Post| it. |WaitForBuffers|

  // will catch the |Post| and |Acquire| the buffer to make it available for

  // consumer.

  pdx::Status<void> AddBuffer(const std::shared_ptr<ConsumerBuffer>& buffer,

                              size_t slot);

  pdx::Status<void> OnBufferAllocated() override;

};

}  // namespace dvr

}  // namespace android

#endif  // ANDROID_DVR_BUFFER_HUB_QUEUE_CLIENT_H_