/* -*- 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 "ImageToI420.h"

#include "ImageContainer.h"

#include "libyuv/convert.h"

#include "mozilla/dom/ImageBitmapBinding.h"

#include "mozilla/dom/ImageUtils.h"

#include "mozilla/gfx/Point.h"

#include "mozilla/RefPtr.h"

#include "nsThreadUtils.h"

using mozilla::ImageFormat;

using mozilla::dom::ImageBitmapFormat;

using mozilla::dom::ImageUtils;

using mozilla::gfx::DataSourceSurface;

using mozilla::gfx::SourceSurface;

using mozilla::gfx::SurfaceFormat;

using mozilla::layers::Image;

using mozilla::layers::PlanarYCbCrData;

using mozilla::layers::PlanarYCbCrImage;

static const PlanarYCbCrData* GetPlanarYCbCrData(Image* aImage)

{

  switch(aImage->GetFormat()) {

    case ImageFormat::PLANAR_YCBCR:

      return aImage->AsPlanarYCbCrImage()->GetData();

    case ImageFormat::NV_IMAGE:

      return aImage->AsNVImage()->GetData();

    default:

      return nullptr;

  }

}

static already_AddRefed<SourceSurface> GetSourceSurface(Image* aImage)

{

  if (!aImage->AsGLImage() || NS_IsMainThread()) {

    return aImage->GetAsSourceSurface();

  }

  // GLImage::GetAsSourceSurface() only supports main thread

  RefPtr<SourceSurface> surf;

  NS_DispatchToMainThread(

    NS_NewRunnableFunction(

      "ImageToI420::GLImage::GetSourceSurface",

      [&aImage, &surf]() { surf = aImage->GetAsSourceSurface(); }),

    NS_DISPATCH_SYNC);

  return surf.forget();

}

static nsresult MapRv(int aRv)

{

  // Docs for libyuv::ConvertToI420 say:

  // Returns 0 for successful; -1 for invalid parameter. Non-zero for failure.

  switch(aRv) {

    case 0:

      return NS_OK;

    case -1:

      return NS_ERROR_INVALID_ARG;

    default:

      return NS_ERROR_FAILURE;

  }

}

namespace mozilla {

nsresult ConvertToI420(

  Image* aImage,

  uint8_t* aDestY,

  int aDestStrideY,

  uint8_t* aDestU,

  int aDestStrideU,

  uint8_t* aDestV,

  int aDestStrideV)

{

  if (!aImage->IsValid()) {

    return NS_ERROR_INVALID_ARG;

  }

  if (const PlanarYCbCrData* data = GetPlanarYCbCrData(aImage)) {

    const ImageUtils imageUtils(aImage);

    switch(imageUtils.GetFormat()) {

      case ImageBitmapFormat::YUV420P:

        return MapRv(libyuv::I420ToI420(

          data->mYChannel,

          data->mYStride,

          data->mCbChannel,

          data->mCbCrStride,

          data->mCrChannel,

          data->mCbCrStride,

          aDestY,

          aDestStrideY,

          aDestU,

          aDestStrideU,

          aDestV,

          aDestStrideV,

          aImage->GetSize().width,

          aImage->GetSize().height));

      case ImageBitmapFormat::YUV422P:

        return MapRv(libyuv::I422ToI420(

          data->mYChannel,

          data->mYStride,

          data->mCbChannel,

          data->mCbCrStride,

          data->mCrChannel,

          data->mCbCrStride,

          aDestY,

          aDestStrideY,

          aDestU,

          aDestStrideU,

          aDestV,

          aDestStrideV,

          aImage->GetSize().width,

          aImage->GetSize().height));

      case ImageBitmapFormat::YUV444P:

        return MapRv(libyuv::I444ToI420(

          data->mYChannel,

          data->mYStride,

          data->mCbChannel,

          data->mCbCrStride,

          data->mCrChannel,

          data->mCbCrStride,

          aDestY,

          aDestStrideY,

          aDestU,

          aDestStrideU,

          aDestV,

          aDestStrideV,

          aImage->GetSize().width,

          aImage->GetSize().height));

      case ImageBitmapFormat::YUV420SP_NV12:

        return MapRv(libyuv::NV12ToI420(

          data->mYChannel,

          data->mYStride,

          data->mCbChannel,

          data->mCbCrStride,

          aDestY,

          aDestStrideY,

          aDestU,

          aDestStrideU,

          aDestV,

          aDestStrideV,

          aImage->GetSize().width,

          aImage->GetSize().height));

      case ImageBitmapFormat::YUV420SP_NV21:

        return MapRv(libyuv::NV21ToI420(

          data->mYChannel,

          data->mYStride,

          data->mCrChannel,

          data->mCbCrStride,

          aDestY,

          aDestStrideY,

          aDestU,

          aDestStrideU,

          aDestV,

          aDestStrideV,

          aImage->GetSize().width,

          aImage->GetSize().height));

      default:

        MOZ_ASSERT_UNREACHABLE("YUV format conversion not implemented");

        return NS_ERROR_NOT_IMPLEMENTED;

    }

  }

  RefPtr<SourceSurface> surf = GetSourceSurface(aImage);

  if (!surf) {

    return NS_ERROR_FAILURE;

  }

  RefPtr<DataSourceSurface> data = surf->GetDataSurface();

  if (!data) {

    return NS_ERROR_FAILURE;

  }

  DataSourceSurface::ScopedMap map(data, DataSourceSurface::READ);

  if (!map.IsMapped()) {

    return NS_ERROR_FAILURE;

  }

  switch (surf->GetFormat()) {

    case SurfaceFormat::B8G8R8A8:

    case SurfaceFormat::B8G8R8X8:

      return MapRv(libyuv::ARGBToI420(

        static_cast<uint8_t*>(map.GetData()),

        map.GetStride(),

        aDestY,

        aDestStrideY,

        aDestU,

        aDestStrideU,

        aDestV,

        aDestStrideV,

        aImage->GetSize().width,

        aImage->GetSize().height));

    case SurfaceFormat::R5G6B5_UINT16:

      return MapRv(libyuv::RGB565ToI420(

        static_cast<uint8_t*>(map.GetData()),

        map.GetStride(),

        aDestY,

        aDestStrideY,

        aDestU,

        aDestStrideU,

        aDestV,

        aDestStrideV,

        aImage->GetSize().width,

        aImage->GetSize().height));

    default:

      MOZ_ASSERT_UNREACHABLE("Surface format conversion not implemented");

      return NS_ERROR_NOT_IMPLEMENTED;

  }

}

} // namespace mozilla