Loading Images in cornerstone

[norman-ma]

This is where the image is loaded in cornerstone.

https://github.com/cornerstonejs/cornerstone/blob/56f51a0752955bab8a308bc900b95e28992cf3ea/src/imageLoader.js#L27

function loadImageFromImageLoader (imageId, options) {
  const colonIndex = imageId.indexOf(':');
  const scheme = imageId.substring(0, colonIndex);
  const loader = imageLoaders[scheme];

  if (loader === undefined || loader === null) {
    if (unknownImageLoader !== undefined) {
      return unknownImageLoader(imageId);
    }

    throw new Error('loadImageFromImageLoader: no image loader for imageId');
  }

  const imageLoadObject = loader(imageId, options);

  // Broadcast an image loaded event once the image is loaded
  imageLoadObject.promise.then(function (image) {
    triggerEvent(events, EVENTS.IMAGE_LOADED, { image });
  }, function (error) {
    const errorObject = {
      imageId,
      error
    };

    triggerEvent(events, EVENTS.IMAGE_LOAD_FAILED, errorObject);
  });

  return imageLoadObject;
}

[norman-ma]

This is where is is invoked in OHIF (cornerstone.loadImage() is a wrapper).

OHIF-Viewers/platform/core/src/classes/StudyPrefetcher.js

Line 144 in 489d4b0

prefetchImageIds(imageIds) {

prefetchImageIds(imageIds) {
    const nonCachedImageIds = this.filterCachedImageIds(imageIds);
    const imageLoadPoolManager = cornerstone.imageLoadPoolManager;

    let requestFn;
    if (this.options.preventCache) {
      requestFn = id => cornerstone.loadImage(id);
    } else {
      requestFn = id => cornerstone.loadAndCacheImage(id);
    }