/// <summary>
/// Sets the encoded image meta data.
/// </summary>
public async Task ParseMetaDataAsync()
{
ImageFormat format = ImageFormatChecker.GetImageFormat_WrapIOException(
GetInputStream());
Format = format;
// Dimensions decoding is not yet supported for WebP since
// BitmapUtil.DecodeDimensions has a bug where it will return 100x100 for
// some WebPs even though those are not its actual dimensions.
if (!ImageFormatHelper.IsWebpFormat(Format))
{
Tuple <int, int> dimensions = await BitmapUtil
.DecodeDimensionsAsync(GetInputStream())
.ConfigureAwait(false);
if (dimensions != default(Tuple <int, int>))
{
Width = dimensions.Item1;
Height = dimensions.Item2;
// Load the rotation angle only if we have the dimensions
if (Format == ImageFormat.JPEG)
{
if (RotationAngle == UNKNOWN_ROTATION_ANGLE)
{
RotationAngle = JfifUtil.GetAutoRotateAngleFromOrientation(
JfifUtil.GetOrientation(GetInputStream()));
}
}
else
{
RotationAngle = 0;
}
}
}
}