private <T> DataSource<CloseableReference<T>> submitFetchRequest(
Producer<CloseableReference<T>> producerSequence,
ImageRequest imageRequest,
ImageRequest.RequestLevel lowestPermittedRequestLevelOnSubmit,
Object callerContext) {
try {
ImageRequest.RequestLevel lowestPermittedRequestLevel =
ImageRequest.RequestLevel.getMax(
imageRequest.getLowestPermittedRequestLevel(), lowestPermittedRequestLevelOnSubmit);
SettableProducerContext settableProducerContext =
new SettableProducerContext(
imageRequest,
generateUniqueFutureId(),
mRequestListener,
callerContext,
lowestPermittedRequestLevel,
/* isPrefetch */ false,
imageRequest.getProgressiveRenderingEnabled()
|| !UriUtil.isNetworkUri(imageRequest.getSourceUri()),
imageRequest.getPriority());
return CloseableProducerToDataSourceAdapter.create(
producerSequence, settableProducerContext, mRequestListener);
} catch (Exception exception) {
return DataSources.immediateFailedDataSource(exception);
}
}
@Override
public void produceResults(
final Consumer<CloseableReference<CloseableImage>> consumer, final ProducerContext context) {
final ImageRequest imageRequest = context.getImageRequest();
ProgressiveDecoder progressiveDecoder;
if (!UriUtil.isNetworkUri(imageRequest.getSourceUri())) {
progressiveDecoder = new LocalImagesProgressiveDecoder(consumer, context);
} else {
ProgressiveJpegParser jpegParser = new ProgressiveJpegParser(mByteArrayPool);
progressiveDecoder =
new NetworkImagesProgressiveDecoder(
consumer, context, jpegParser, mProgressiveJpegConfig);
}
mNextProducer.produceResults(progressiveDecoder, context);
}
/**
* Submits a request for execution and returns a DataSource representing the pending encoded
* image(s).
*
* <p>The ResizeOptions in the imageRequest will be ignored for this fetch
*
* <p>The returned DataSource must be closed once the client has finished with it.
*
* @param imageRequest the request to submit
* @return a DataSource representing the pending encoded image(s)
*/
public DataSource<CloseableReference<PooledByteBuffer>> fetchEncodedImage(
ImageRequest imageRequest, Object callerContext) {
Preconditions.checkNotNull(imageRequest.getSourceUri());
try {
Producer<CloseableReference<PooledByteBuffer>> producerSequence =
mProducerSequenceFactory.getEncodedImageProducerSequence(imageRequest);
// The resize options are used to determine whether images are going to be downsampled during
// decode or not. For the case where the image has to be downsampled and it's a local image it
// will be kept as a FileInputStream until decoding instead of reading it in memory. Since
// this method returns an encoded image, it should always be read into memory. Therefore, the
// resize options are ignored to avoid treating the image as if it was to be downsampled
// during decode.
if (imageRequest.getResizeOptions() != null) {
imageRequest = ImageRequestBuilder.fromRequest(imageRequest).setResizeOptions(null).build();
}
return submitFetchRequest(
producerSequence, imageRequest, ImageRequest.RequestLevel.FULL_FETCH, callerContext);
} catch (Exception exception) {
return DataSources.immediateFailedDataSource(exception);
}
}