/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 "mozilla/dom/StructuredClone.h"

#include "js/StructuredClone.h"

#include "mozilla/dom/ImageData.h"

#include "mozilla/dom/StructuredCloneTags.h"

namespace mozilla {

namespace dom {

JSObject*

ReadStructuredCloneImageData(JSContext* aCx, JSStructuredCloneReader* aReader)

{

  // Read the information out of the stream.

  uint32_t width, height;

  JS::Rooted<JS::Value> dataArray(aCx);

  if (!JS_ReadUint32Pair(aReader, &width, &height) ||

      !JS_ReadTypedArray(aReader, &dataArray)) {

    return nullptr;

  }

  MOZ_ASSERT(dataArray.isObject());

  // Protect the result from a moving GC in ~nsRefPtr.

  JS::Rooted<JSObject*> result(aCx);

  {

    // Construct the ImageData.

    RefPtr<ImageData> imageData = new ImageData(width, height,

                                                  dataArray.toObject());

    // Wrap it in a JS::Value.

    if (!imageData->WrapObject(aCx, nullptr, &result)) {

      return nullptr;

    }

  }

  return result;

}

bool

WriteStructuredCloneImageData(JSContext* aCx, JSStructuredCloneWriter* aWriter,

                              ImageData* aImageData)

{

  uint32_t width = aImageData->Width();

  uint32_t height = aImageData->Height();

  JS::Rooted<JSObject*> dataArray(aCx, aImageData->GetDataObject());

  if (!JS_WrapObject(aCx, &dataArray)) {

    return false;

  }

  JS::Rooted<JS::Value> arrayValue(aCx, JS::ObjectValue(*dataArray));

  return JS_WriteUint32Pair(aWriter, SCTAG_DOM_IMAGEDATA, 0) &&

         JS_WriteUint32Pair(aWriter, width, height) &&

         JS_WriteTypedArray(aWriter, arrayValue);

}

} // namespace dom

} // namespace mozilla