// Helper for weighted regions.
nsresult
CameraControlImpl::Set(JSContext* aCx, uint32_t aKey, const JS::Value& aValue, uint32_t aLimit)
{
  if (aLimit == 0) {
    DOM_CAMERA_LOGI("%s:%d : aLimit = 0, nothing to do\n", __func__, __LINE__);
    return NS_OK;
  }

  if (!aValue.isObject()) {
    return NS_ERROR_INVALID_ARG;
  }

  uint32_t length = 0;

  JSObject* regions = &aValue.toObject();
  if (!JS_GetArrayLength(aCx, regions, &length)) {
    return NS_ERROR_FAILURE;
  }

  DOM_CAMERA_LOGI("%s:%d : got %d regions (limited to %d)\n", __func__, __LINE__, length, aLimit);
  if (length > aLimit) {
    length = aLimit;
  }

  nsTArray<CameraRegion> regionArray;
  regionArray.SetCapacity(length);

  for (uint32_t i = 0; i < length; ++i) {
    JS::Value v;

    if (!JS_GetElement(aCx, regions, i, &v)) {
      return NS_ERROR_FAILURE;
    }

    CameraRegion* r = regionArray.AppendElement();
    /**
     * These are the default values.  We can remove these when the xpidl
     * dictionary parser gains the ability to grok default values.
     */
    r->top = -1000;
    r->left = -1000;
    r->bottom = 1000;
    r->right = 1000;
    r->weight = 1000;

    nsresult rv = r->Init(aCx, &v);
    NS_ENSURE_SUCCESS(rv, rv);

    DOM_CAMERA_LOGI("region %d: top=%d, left=%d, bottom=%d, right=%d, weight=%d\n",
      i,
      r->top,
      r->left,
      r->bottom,
      r->right,
      r->weight
    );
  }
  SetParameter(aKey, regionArray);
  return NS_OK;
}
// JS-to-native helpers
// Setter for weighted regions: { top, bottom, left, right, weight }
nsresult
nsDOMCameraControl::Set(JSContext* aCx, uint32_t aKey, const JS::Value& aValue, uint32_t aLimit)
{
  if (aLimit == 0) {
    DOM_CAMERA_LOGI("%s:%d : aLimit = 0, nothing to do\n", __func__, __LINE__);
    return NS_OK;
  }

  if (!aValue.isObject()) {
    return NS_ERROR_INVALID_ARG;
  }

  uint32_t length = 0;

  JS::Rooted<JSObject*> regions(aCx, &aValue.toObject());
  if (!JS_GetArrayLength(aCx, regions, &length)) {
    return NS_ERROR_FAILURE;
  }

  DOM_CAMERA_LOGI("%s:%d : got %d regions (limited to %d)\n", __func__, __LINE__, length, aLimit);
  if (length > aLimit) {
    length = aLimit;
  }

  nsTArray<ICameraControl::Region> regionArray;
  regionArray.SetCapacity(length);

  for (uint32_t i = 0; i < length; ++i) {
    JS::Rooted<JS::Value> v(aCx);

    if (!JS_GetElement(aCx, regions, i, &v)) {
      return NS_ERROR_FAILURE;
    }

    CameraRegion region;
    if (!region.Init(aCx, v)) {
      return NS_ERROR_FAILURE;
    }

    ICameraControl::Region* r = regionArray.AppendElement();
    r->top = region.mTop;
    r->left = region.mLeft;
    r->bottom = region.mBottom;
    r->right = region.mRight;
    r->weight = region.mWeight;

    DOM_CAMERA_LOGI("region %d: top=%d, left=%d, bottom=%d, right=%d, weight=%u\n",
      i,
      r->top,
      r->left,
      r->bottom,
      r->right,
      r->weight
    );
  }
  return mCameraControl->Set(aKey, regionArray);
}