src/input_sample/input_sample.h

// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FUCHSIA_SDK_EXAMPLES_CC_INPUT_SAMPLE_H_
#define FUCHSIA_SDK_EXAMPLES_CC_INPUT_SAMPLE_H_

#include <fidl/fuchsia.device.fs/cpp/wire.h>
#include <fidl/fuchsia.driver.framework/cpp/wire.h>
#include <fidl/fuchsia.input.report/cpp/wire.h>
#include <lib/async/dispatcher.h>
#include <lib/driver2/namespace.h>
#include <lib/driver2/record_cpp.h>
#include <lib/driver2/structured_logger.h>
#include <lib/fdf/cpp/dispatcher.h>
#include <lib/input_report_reader/reader.h>
#include <lib/sys/component/cpp/outgoing_directory.h>
#include <lib/zx/status.h>
#include <unistd.h>

#include <memory>
#include <mutex>

namespace input_sample {

// Used by the input report reader library to transform reports over FIDL
struct SampleInputReport {
  zx::time event_time;
  uint8_t buttons = 0;
  int8_t rel_x = 0;
  int8_t rel_y = 0;

  void ToFidlInputReport(
      fidl::WireTableBuilder<::fuchsia_input_report::wire::InputReport>& input_report,
      fidl::AnyArena& arena);
};

// Sample driver for a virtual input device that generates input reports.
class InputSampleDriver {
 public:
  InputSampleDriver(async_dispatcher_t* dispatcher,
                    fidl::WireSharedClient<fuchsia_driver_framework::Node> node,
                    driver::Namespace ns, driver::Logger logger)
      : dispatcher_(dispatcher),
        outgoing_(component::OutgoingDirectory::Create(dispatcher)),
        node_(std::move(node)),
        ns_(std::move(ns)),
        logger_(std::move(logger)) {}
  virtual ~InputSampleDriver() = default;

  static constexpr const char* Name() { return "input-sample"; }

  static zx::status<std::unique_ptr<InputSampleDriver>> Start(
      fuchsia_driver_framework::wire::DriverStartArgs& start_args,
      fdf::UnownedDispatcher dispatcher,
      fidl::WireSharedClient<fuchsia_driver_framework::Node> node, driver::Namespace ns,
      driver::Logger logger);

 private:
  zx::status<> Run(fidl::ServerEnd<fuchsia_io::Directory> outgoing_dir);
  void SendFakeReport();

  async_dispatcher_t* const dispatcher_;
  component::OutgoingDirectory outgoing_;
  fidl::WireSharedClient<fuchsia_driver_framework::Node> node_;
  driver::Namespace ns_;
  driver::Logger logger_;

  std::shared_ptr<input_report_reader::InputReportReaderManager<SampleInputReport>>
      input_report_readers_;
  SampleInputReport report_;
};

}  // namespace input_sample

#endif  // FUCHSIA_SDK_EXAMPLES_CC_INPUT_SAMPLE_H_