screenshot_handler.h

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/*
 * Copyright (C) 2024 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 <future>
#include <mutex>
 
#include <fmt/format.h>
 
#include "cuttlefish/common/libs/utils/result.h"
#include "cuttlefish/host/libs/screen_connector/video_frame_buffer.h"
 
namespace cuttlefish {
 
class ScreenshotHandler {
 public:
  ScreenshotHandler() = default;
  ~ScreenshotHandler() = default;
 
  using SharedFrame = std::shared_ptr<VideoFrameBuffer>;
  using SharedFrameFuture = std::shared_future<SharedFrame>;
  using SharedFramePromise = std::promise<SharedFrame>;
 
  Result<void> Screenshot(std::uint32_t display_number,
                          const std::string& screenshot_path);
 
  void OnFrame(std::uint32_t display_number, SharedFrame& frame);
 
 private:
  std::mutex pending_screenshot_displays_mutex_;
  // Promises used to share a frame for a given display from the display handler
  // thread to the snapshot thread for processing.
  std::unordered_map<std::uint32_t, SharedFramePromise>
      pending_screenshot_displays_;
};
 
}  // namespace cuttlefish