/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GMPVideoPlaneImpl.h"
#include "mozilla/gmp/GMPTypes.h"
#include "GMPVideoHost.h"
#include "GMPSharedMemManager.h"

namespace mozilla::gmp {

GMPPlaneImpl::GMPPlaneImpl(GMPVideoHostImpl* aHost)
    : mSize(0), mStride(0), mHost(aHost) {
  MOZ_ASSERT(mHost);
  mHost->PlaneCreated(this);
}

GMPPlaneImpl::GMPPlaneImpl(const GMPPlaneData& aPlaneData,
                           GMPVideoHostImpl* aHost)
    : mBuffer(aPlaneData.mBuffer()),
      mSize(aPlaneData.mSize()),
      mStride(aPlaneData.mStride()),
      mHost(aHost) {
  MOZ_ASSERT(mHost);
  mHost->PlaneCreated(this);
}

GMPPlaneImpl::~GMPPlaneImpl() {
  DestroyBuffer();
  if (mHost) {
    mHost->PlaneDestroyed(this);
  }
}

void GMPPlaneImpl::DoneWithAPI() {
  DestroyBuffer();

  // Do this after destroying the buffer because destruction
  // involves deallocation, which requires a host.
  mHost = nullptr;
}

void GMPPlaneImpl::ActorDestroyed() {
  // Simply clear out Shmem reference, do not attempt to
  // properly free it. It has already been freed.
  mBuffer = ipc::Shmem();
  // No more host.
  mHost = nullptr;
}

bool GMPPlaneImpl::InitPlaneData(GMPPlaneData& aPlaneData) {
  aPlaneData.mBuffer() = mBuffer;
  aPlaneData.mSize() = mSize;
  aPlaneData.mStride() = mStride;

  // This method is called right before Shmem is sent to another process.
  // We need to effectively zero out our member copy so that we don't
  // try to delete memory we don't own later.
  mBuffer = ipc::Shmem();

  return true;
}

GMPErr GMPPlaneImpl::MaybeResize(int32_t aNewSize) {
  if (aNewSize <= AllocatedSize()) {
    return GMPNoErr;
  }

  if (!mHost) {
    return GMPGenericErr;
  }

  ipc::Shmem new_mem;
  if (!mHost->SharedMemMgr()->MgrAllocShmem(
          GMPSharedMem::kGMPFrameData, aNewSize, ipc::SharedMemory::TYPE_BASIC,
          &new_mem) ||
      !new_mem.get<uint8_t>()) {
    return GMPAllocErr;
  }

  if (mBuffer.IsReadable()) {
    memcpy(new_mem.get<uint8_t>(), Buffer(), mSize);
  }

  DestroyBuffer();

  mBuffer = new_mem;

  return GMPNoErr;
}

void GMPPlaneImpl::DestroyBuffer() {
  if (mHost && mBuffer.IsWritable()) {
    mHost->SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPFrameData,
                                           mBuffer);
  }
  mBuffer = ipc::Shmem();
}

GMPErr GMPPlaneImpl::CreateEmptyPlane(int32_t aAllocatedSize, int32_t aStride,
                                      int32_t aPlaneSize) {
  if (aAllocatedSize < 1 || aStride < 1 || aPlaneSize < 1) {
    return GMPGenericErr;
  }

  GMPErr err = MaybeResize(aAllocatedSize);
  if (err != GMPNoErr) {
    return err;
  }

  mSize = aPlaneSize;
  mStride = aStride;

  return GMPNoErr;
}

GMPErr GMPPlaneImpl::Copy(const GMPPlane& aPlane) {
  auto& planeimpl = static_cast<const GMPPlaneImpl&>(aPlane);

  GMPErr err = MaybeResize(planeimpl.mSize);
  if (err != GMPNoErr) {
    return err;
  }

  if (planeimpl.Buffer() && planeimpl.mSize > 0) {
    memcpy(Buffer(), planeimpl.Buffer(), mSize);
  }

  mSize = planeimpl.mSize;
  mStride = planeimpl.mStride;

  return GMPNoErr;
}

GMPErr GMPPlaneImpl::Copy(int32_t aSize, int32_t aStride,
                          const uint8_t* aBuffer) {
  GMPErr err = MaybeResize(aSize);
  if (err != GMPNoErr) {
    return err;
  }

  if (aBuffer && aSize > 0) {
    memcpy(Buffer(), aBuffer, aSize);
  }

  mSize = aSize;
  mStride = aStride;

  return GMPNoErr;
}

void GMPPlaneImpl::Swap(GMPPlane& aPlane) {
  auto& planeimpl = static_cast<GMPPlaneImpl&>(aPlane);

  std::swap(mStride, planeimpl.mStride);
  std::swap(mSize, planeimpl.mSize);
  std::swap(mBuffer, planeimpl.mBuffer);
}

int32_t GMPPlaneImpl::AllocatedSize() const {
  if (mBuffer.IsWritable()) {
    return mBuffer.Size<uint8_t>();
  }
  return 0;
}

void GMPPlaneImpl::ResetSize() { mSize = 0; }

bool GMPPlaneImpl::IsZeroSize() const { return (mSize == 0); }

int32_t GMPPlaneImpl::Stride() const { return mStride; }

const uint8_t* GMPPlaneImpl::Buffer() const { return mBuffer.get<uint8_t>(); }

uint8_t* GMPPlaneImpl::Buffer() { return mBuffer.get<uint8_t>(); }

void GMPPlaneImpl::Destroy() { delete this; }

}  // namespace mozilla::gmp