host/vsoc/gralloc/gralloc_buffer_region.h

#pragma once
/*
 * Copyright (C) 2017 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.
 */

#include "common/vsoc/lib/typed_region_view.h"
#include "common/vsoc/shm/gralloc_layout.h"
#include "uapi/vsoc_shm.h"

#include <string>

namespace vsoc {
namespace gralloc {

// Allows access to the gralloc buffer region from host side. It needs to be a
// different class than the one on guest side because of the required
// interactions with the kernel on the guest.
// Initially this class only returns a pointer to a buffer in memory given a
// region offset, which is enough for now since it's only used by the hwcomposer
// (which gets all other information from the guest side hwcomposer) and by the
// VNC server (which uses only the frame buffer and gets the information it
// needs from the framebuffer region).
class GrallocBufferRegion
    : vsoc::TypedRegionView<vsoc::layout::gralloc::GrallocBufferLayout> {
 public:
  static GrallocBufferRegion* GetInstance();

  uint8_t* OffsetToBufferPtr(vsoc_reg_off_t offset);
 protected:
  GrallocBufferRegion(char* domain);
  bool is_open_{};
};

}
}