/// <summary>
/// Checks whether the producer may be able to produce images of
/// the specified size. This makes no promise about being able to
/// produce images for a particular source, only generally being
/// able to produce output of the desired resolution.
///
/// <para />In this case, assumptions are made about the common
/// size of EXIF thumbnails which is that they may be up to 512
/// pixels in each dimension.
/// </summary>
/// <param name="resizeOptions">
/// The resize options from the current request.
/// </param>
/// <returns>
/// true if the producer can meet these needs.
/// </returns>
public bool CanProvideImageForSize(ResizeOptions resizeOptions)
{
return(ThumbnailSizeChecker.IsImageBigEnough(
COMMON_EXIF_THUMBNAIL_MAX_DIMENSION,
COMMON_EXIF_THUMBNAIL_MAX_DIMENSION,
resizeOptions));
}
protected override void OnNewResultImpl(EncodedImage newResult, bool isLast)
{
ImageRequest request = _producerContext.ImageRequest;
bool isGoodEnough =
ThumbnailSizeChecker.IsImageBigEnough(newResult, request.ResizeOptions);
if (newResult != null && (isGoodEnough || request.IsLocalThumbnailPreviewsEnabled))
{
Consumer.OnNewResult(newResult, isLast && isGoodEnough);
}
if (isLast && !isGoodEnough)
{
EncodedImage.CloseSafely(newResult);
_inputProducer2.ProduceResults(Consumer, _producerContext);
}
}
protected override void OnNewResultImpl(EncodedImage newResult, bool isLast)
{
if (newResult != null &&
(!isLast || ThumbnailSizeChecker.IsImageBigEnough(newResult, _resizeOptions)))
{
Consumer.OnNewResult(newResult, isLast);
}
else if (isLast)
{
EncodedImage.CloseSafely(newResult);
bool fallback = _parent.ProduceResultsFromThumbnailProducer(
_producerIndex + 1,
Consumer,
_producerContext);
if (!fallback)
{
Consumer.OnNewResult(null, true);
}
}
}
