content/browser/gpu/gpu_memory_buffer_manager_singleton.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_MANAGER_SINGLETON_H_
#define CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_MANAGER_SINGLETON_H_

#include "base/memory/raw_ptr.h"
#include "components/viz/host/host_gpu_memory_buffer_manager.h"
#include "content/public/browser/gpu_data_manager_observer.h"

namespace content {

class GpuDataManagerImpl;

// This class ensures that there is at most one instance of
// |viz::HostGpuMemoryBufferManager| in content at any given time. Code in
// content must use this class to access the instance.
//
// With non-Ozone/X11 and Ozone/X11, the supported buffer configurations can
// only be determined at runtime, with help from the GPU process.
// GpuDataManagerObserver adds functionality for updating the supported
// configuration list when new GPUInfo is received.
class GpuMemoryBufferManagerSingleton : public viz::HostGpuMemoryBufferManager,
                                        public GpuDataManagerObserver {
 public:
  explicit GpuMemoryBufferManagerSingleton(int client_id);
  GpuMemoryBufferManagerSingleton(const GpuMemoryBufferManagerSingleton&) =
      delete;
  GpuMemoryBufferManagerSingleton& operator=(
      const GpuMemoryBufferManagerSingleton&) = delete;
  ~GpuMemoryBufferManagerSingleton() override;

  static GpuMemoryBufferManagerSingleton* GetInstance();

 private:
  // GpuDataManagerObserver:
  void OnGpuExtraInfoUpdate() override;

  raw_ptr<GpuDataManagerImpl> gpu_data_manager_impl_ = nullptr;
};

}  // namespace content

#endif  // CONTENT_BROWSER_GPU_GPU_MEMORY_BUFFER_MANAGER_SINGLETON_H_