content/renderer/pepper/host_array_buffer_var.h

// Copyright 2012 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_RENDERER_PEPPER_HOST_ARRAY_BUFFER_VAR_H_
#define CONTENT_RENDERER_PEPPER_HOST_ARRAY_BUFFER_VAR_H_

#include <stdint.h>

#include "base/memory/unsafe_shared_memory_region.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/shared_impl/host_resource.h"
#include "ppapi/shared_impl/var.h"
#include "third_party/blink/public/web/web_array_buffer.h"

namespace content {

// Represents a host-side ArrayBufferVar.
class HostArrayBufferVar : public ppapi::ArrayBufferVar {
 public:
  explicit HostArrayBufferVar(uint32_t size_in_bytes);
  explicit HostArrayBufferVar(const blink::WebArrayBuffer& buffer);
  explicit HostArrayBufferVar(uint32_t size_in_bytes,
                              const base::UnsafeSharedMemoryRegion& Region);

  HostArrayBufferVar(const HostArrayBufferVar&) = delete;
  HostArrayBufferVar& operator=(const HostArrayBufferVar&) = delete;

  // ArrayBufferVar implementation.
  void* Map() override;
  void Unmap() override;
  uint32_t ByteLength() override;
  bool CopyToNewShmem(
      PP_Instance instance,
      int* host_shm_handle_id,
      base::UnsafeSharedMemoryRegion* plugin_shm_region) override;

  blink::WebArrayBuffer& webkit_buffer() { return buffer_; }

 private:
  ~HostArrayBufferVar() override;

  blink::WebArrayBuffer buffer_;
  // Tracks whether the data in the buffer is valid.
  bool valid_;
};

}  // namespace content

#endif  // CONTENT_RENDERER_PEPPER_HOST_ARRAY_BUFFER_VAR_H_