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getEnabledElement,
StackViewport,
imageLoader,
Enums,
eventTarget,
imageLoadPoolManager,
cache,
Types,
} from '@cornerstonejs/core';
import { addToolState, getToolState } from './state';
const requestType = Enums.RequestType.Prefetch;
const priority = 0;
const addToBeginning = true;
let configuration = {
maxImagesToPrefetch: Infinity,
preserveExistingPool: false,
};
let resetPrefetchTimeout;
const resetPrefetchDelay = 10;
function range(lowEnd, highEnd) {
// Javascript version of Python's range function
// http://stackoverflow.com/questions/3895478/does-javascript-have-a-method-like-range-to-generate-an-array-based-on-suppl
lowEnd = Math.round(lowEnd) || 0;
highEnd = Math.round(highEnd) || 0;
const arr = [];
let c = highEnd - lowEnd + 1;
if (c <= 0) {
return arr;
}
while (c--) {
arr[c] = highEnd--;
}
return arr;
}
function nearestIndex(arr, x) {
// Return index of nearest values in array
// http://stackoverflow.com/questions/25854212/return-index-of-nearest-values-in-an-array
let low = 0;
let high = arr.length - 1;
arr.forEach((v, idx) => {
if (v < x) {
low = Math.max(idx, low);
} else if (v > x) {
high = Math.min(idx, high);
}
});
return { low, high };
}
function getStackData(element) {
const enabledElement = getEnabledElement(element);
if (!enabledElement) {
throw new Error(
'stackPrefetch: element must be a valid Cornerstone enabled element'
);
}
const { viewport } = enabledElement;
if (!(viewport instanceof StackViewport)) {
throw new Error(
'stackPrefetch: element must be a StackViewport, VolumeViewport stackPrefetch not yet implemented'
);
}
return {
currentImageIdIndex: viewport.getCurrentImageIdIndex(),
imageIds: viewport.getImageIds(),
};
}
function prefetch(element) {
// Get the stackPrefetch tool data
const stackPrefetchData = getToolState(element);
if (!stackPrefetchData) {
return;
}
const stackPrefetch = stackPrefetchData || {};
const stack = getStackData(element);
if (!stack || !stack.imageIds || stack.imageIds.length === 0) {
console.warn('CornerstoneTools.stackPrefetch: No images in stack.');
return;
}
// If all the requests are complete, disable the stackPrefetch tool
if (
!stackPrefetch.indicesToRequest ||
!stackPrefetch.indicesToRequest.length
) {
stackPrefetch.enabled = false;
}
// Make sure the tool is still enabled
if (stackPrefetch.enabled === false) {
return;
}
// Remove an imageIdIndex from the list of indices to request
// This fires when the individual image loading deferred is resolved
function removeFromList(imageIdIndex) {
const index = stackPrefetch.indicesToRequest.indexOf(imageIdIndex);
if (index > -1) {
// Don't remove last element if imageIdIndex not found
stackPrefetch.indicesToRequest.splice(index, 1);
}
}
// Remove all already cached images from the
// IndicesToRequest array
stackPrefetchData.indicesToRequest.sort((a, b) => a - b);
const indicesToRequestCopy = stackPrefetch.indicesToRequest.slice();
indicesToRequestCopy.forEach(function (imageIdIndex) {
const imageId = stack.imageIds[imageIdIndex];
if (!imageId) {
return;
}
const imageLoadObject = cache.getImageLoadObject(imageId);
if (imageLoadObject) {
removeFromList(imageIdIndex);
}
});
// Stop here if there are no images left to request
// After those in the cache have been removed
if (!stackPrefetch.indicesToRequest.length) {
return;
}
// Clear the requestPool of prefetch requests, if needed.
if (!configuration.preserveExistingPool) {
imageLoadPoolManager.clearRequestStack(requestType);
}
// Identify the nearest imageIdIndex to the currentImageIdIndex
const nearest = nearestIndex(
stackPrefetch.indicesToRequest,
stack.currentImageIdIndex
);
let imageId;
let nextImageIdIndex;
const preventCache = false;
function doneCallback(image) {
console.log('prefetch done: %s', image.imageId);
const imageIdIndex = stack.imageIds.indexOf(image.imageId);
removeFromList(imageIdIndex);
// triggerEvent(element, EVENTS.STACK_PREFETCH_IMAGE_LOADED, {
// element,
// imageId: image.imageId,
// imageIndex: imageIdIndex,
// stackPrefetch,
// stack,
// });
// If there are no more images to fetch
// if (
// !(
// stackPrefetch.indicesToRequest &&
// stackPrefetch.indicesToRequest.length > 0
// )
// ) {
// triggerEvent(element, EVENTS.STACK_PREFETCH_DONE, {
// element,
// stackPrefetch,
// stack,
// });
// }
}
// Retrieve the errorLoadingHandler if one exists
// const errorLoadingHandler =
// loadHandlerManager.getErrorLoadingHandler(element);
// function failCallback(error) {
// logger.log('prefetch errored: %o', error);
// if (errorLoadingHandler) {
// errorLoadingHandler(element, imageId, error, 'stackPrefetch');
// }
// }
// Prefetch images around the current image (before and after)
let lowerIndex = nearest.low;
let higherIndex = nearest.high;
const imageIdsToPrefetch = [];
while (
lowerIndex >= 0 ||
higherIndex < stackPrefetch.indicesToRequest.length
) {
const currentIndex = stack.currentImageIdIndex;
const shouldSkipLower =
currentIndex - stackPrefetch.indicesToRequest[lowerIndex] >
configuration.maxImagesToPrefetch;
const shouldSkipHigher =
stackPrefetch.indicesToRequest[higherIndex] - currentIndex >
configuration.maxImagesToPrefetch;
const shouldLoadLower = !shouldSkipLower && lowerIndex >= 0;
const shouldLoadHigher =
!shouldSkipHigher && higherIndex < stackPrefetch.indicesToRequest.length;
if (!shouldLoadHigher && !shouldLoadLower) {
break;
}
if (shouldLoadLower) {
nextImageIdIndex = stackPrefetch.indicesToRequest[lowerIndex--];
imageId = stack.imageIds[nextImageIdIndex];
imageIdsToPrefetch.push(imageId);
}
if (shouldLoadHigher) {
nextImageIdIndex = stackPrefetch.indicesToRequest[higherIndex++];
imageId = stack.imageIds[nextImageIdIndex];
imageIdsToPrefetch.push(imageId);
}
}
const requestFn = (imageId, options) =>
imageLoader.loadAndCacheImage(imageId, options);
imageIdsToPrefetch.forEach((imageId) => {
// IMPORTANT: Request type should be passed if not the 'interaction'
// highest priority will be used for the request type in the imageRetrievalPool
const options = {
targetBuffer: {
type: 'Float32Array',
offset: null,
length: null,
},
preScale: {
enabled: true,
},
requestType,
};
imageLoadPoolManager.addRequest(
requestFn.bind(null, imageId, options),
requestType,
// Additional details
{
imageId,
},
priority
// addToBeginning
);
});
}
function getPromiseRemovedHandler(element) {
return function (e) {
const eventData = e.detail;
// When an imagePromise has been pushed out of the cache, re-add its index
// It to the indicesToRequest list so that it will be retrieved later if the
// CurrentImageIdIndex is changed to an image nearby
let stackData;
try {
// It will throw an exception in some cases (eg: thumbnails)
stackData = getStackData(element);
} catch (error) {
return;
}
if (!stackData || !stackData.imageIds || stackData.imageIds.length === 0) {
return;
}
const stack = stackData;
const imageIdIndex = stack.imageIds.indexOf(eventData.imageId);
// Make sure the image that was removed is actually in this stack
// Before adding it to the indicesToRequest array
if (imageIdIndex < 0) {
return;
}
const stackPrefetchData = getToolState(element);
if (
!stackPrefetchData ||
!stackPrefetchData.data ||
!stackPrefetchData.data.length
) {
return;
}
stackPrefetchData.indicesToRequest.push(imageIdIndex);
};
}
function onImageUpdated(e) {
// Start prefetching again (after a delay)
// When the user has scrolled to a new image
clearTimeout(resetPrefetchTimeout);
resetPrefetchTimeout = setTimeout(function () {
const element = e.target;
// If playClip is enabled and the user loads a different series in the viewport
// An exception will be thrown because the element will not be enabled anymore
try {
prefetch(element);
} catch (error) {
return;
}
}, resetPrefetchDelay);
}
function enable(element) {
const stack = getStackData(element);
if (!stack || !stack.imageIds || stack.imageIds.length === 0) {
console.warn('CornerstoneTools.stackPrefetch: No images in stack.');
return;
}
// Use the currentImageIdIndex from the stack as the initialImageIdIndex
const stackPrefetchData = {
indicesToRequest: range(0, stack.imageIds.length - 1),
enabled: true,
direction: 1,
};
// Remove the currentImageIdIndex from the list to request
const indexOfCurrentImage = stackPrefetchData.indicesToRequest.indexOf(
stack.currentImageIdIndex
);
stackPrefetchData.indicesToRequest.splice(indexOfCurrentImage, 1);
addToolState(element, stackPrefetchData);
prefetch(element);
element.removeEventListener(Enums.Events.STACK_NEW_IMAGE, onImageUpdated);
element.addEventListener(Enums.Events.STACK_NEW_IMAGE, onImageUpdated);
const promiseRemovedHandler = getPromiseRemovedHandler(element);
eventTarget.removeEventListener(
Enums.Events.IMAGE_CACHE_IMAGE_REMOVED,
promiseRemovedHandler
);
eventTarget.addEventListener(
Enums.Events.IMAGE_CACHE_IMAGE_REMOVED,
promiseRemovedHandler
);
}
function disable(element) {
clearTimeout(resetPrefetchTimeout);
element.removeEventListener(Enums.Events.STACK_NEW_IMAGE, onImageUpdated);
const promiseRemovedHandler = getPromiseRemovedHandler(element);
eventTarget.removeEventListener(
Enums.Events.IMAGE_CACHE_IMAGE_REMOVED,
promiseRemovedHandler
);
const stackPrefetchData = getToolState(element);
// If there is actually something to disable, disable it
if (stackPrefetchData && stackPrefetchData.data.length) {
stackPrefetchData.enabled = false;
// Clear current prefetch requests from the requestPool
imageLoadPoolManager.clearRequestStack(requestType);
}
}
function getConfiguration() {
return configuration;
}
function setConfiguration(config) {
configuration = config;
}
export { enable, disable, getConfiguration, setConfiguration };
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