/// <summary>
/// bitmap cache get ->
/// background thread hand-off -> bitmap cache -> decode ->
/// resize and rotate -> (webp transcode) -> data fetch.
/// </summary>
private IProducer <CloseableReference <CloseableImage> > GetDataFetchSequence()
{
lock (_gate)
{
if (_dataFetchSequence == null)
{
IProducer <EncodedImage> inputProducer = _producerFactory.NewDataFetchProducer();
inputProducer = ProducerFactory.NewAddImageTransformMetaDataProducer(inputProducer);
if (!_downsampleEnabled)
{
inputProducer = _producerFactory.NewResizeAndRotateProducer(inputProducer);
}
_dataFetchSequence = NewBitmapCacheGetToDecodeSequence(inputProducer);
}
return(_dataFetchSequence);
}
}
/// <summary>
/// Branch on separate images
/// -> thumbnail resize and rotate -> thumbnail producers as provided
/// -> local image resize and rotate -> add meta data producer
/// </summary>
/// <param name="inputProducer">
/// Producer providing the input to add meta data producer.
/// </param>
/// <param name="thumbnailProducers">
/// The thumbnail producers from which to request the image before
/// falling back to the full image producer sequence.
/// </param>
/// <returns>Local transformations sequence.</returns>
private IProducer <EncodedImage> NewLocalTransformationsSequence(
IProducer <EncodedImage> inputProducer,
IThumbnailProducer <EncodedImage>[] thumbnailProducers)
{
IProducer <EncodedImage> localImageProducer =
ProducerFactory.NewAddImageTransformMetaDataProducer(inputProducer);
if (!_downsampleEnabled)
{
localImageProducer = _producerFactory.NewResizeAndRotateProducer(localImageProducer);
}
ThrottlingProducer <EncodedImage> localImageThrottlingProducer =
_producerFactory.NewThrottlingProducer(
_throttlingMaxSimultaneousRequests,
localImageProducer);
return(ProducerFactory.NewBranchOnSeparateImagesProducer(
NewLocalThumbnailProducer(thumbnailProducers),
localImageThrottlingProducer));
}
/// <summary>
/// multiplex -> encoded cache -> disk cache -> (webp transcode) ->
/// network fetch.
/// </summary>
private IProducer <EncodedImage> GetCommonNetworkFetchToEncodedMemorySequence()
{
lock (_gate)
{
if (_commonNetworkFetchToEncodedMemorySequence == null)
{
IProducer <EncodedImage> inputProducer =
NewEncodedCacheMultiplexToTranscodeSequence(
_producerFactory.NewNetworkFetchProducer(_networkFetcher));
_commonNetworkFetchToEncodedMemorySequence =
ProducerFactory.NewAddImageTransformMetaDataProducer(inputProducer);
if (_resizeAndRotateEnabledForNetwork && !_downsampleEnabled)
{
_commonNetworkFetchToEncodedMemorySequence =
_producerFactory.NewResizeAndRotateProducer(
_commonNetworkFetchToEncodedMemorySequence);
}
}
return(_commonNetworkFetchToEncodedMemorySequence);
}
}
