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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 | 1x 1x 1x | import {
imageLoader,
Enums,
eventTarget,
imageLoadPoolManager,
cache,
getConfiguration as getCoreConfiguration,
} from '@cornerstonejs/core';
import { addToolState, getToolState } from './state';
import {
getStackData,
requestType,
priority,
getPromiseRemovedHandler,
nearestIndex,
range,
} from './stackPrefetchUtils';
let configuration = {
maxImagesToPrefetch: Infinity,
// Preserving the existing pool should be the default behaviour, as there might
// be a volume of the same series already being loaded in the pool, and we don't want
// to cancel it middle of the way when the other stack viewport mounts. Worst case scenario
// there will be a few extra images in the pool but by the time that their turn comes
// we will have already loaded the volume and it will get read from the CACHE,
// so who cares
preserveExistingPool: true,
};
let resetPrefetchTimeout;
const resetPrefetchDelay = 10;
function prefetch(element) {
// Get the stackPrefetch tool data
const stackPrefetchData = getToolState(element);
if (!stackPrefetchData) {
return;
}
const stackPrefetch = stackPrefetchData || {};
const stack = getStackData(element);
if (!stack?.imageIds?.length) {
console.warn('CornerstoneTools.stackPrefetch: No images in stack.');
return;
}
const { currentImageIdIndex } = stack;
// If all the requests are complete, disable the stackPrefetch tool
stackPrefetch.enabled &&= stackPrefetch.indicesToRequest?.length;
// 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 distance = Math.abs(currentImageIdIndex - imageIdIndex);
// For nearby objects, ensure the last accessed time is updated
// by using getImageLoadObject.
// For more distant objects, just check if available, but dont
// change the access time.
// This allows throwing data that hasn't been accessed and is not
// nearby.
const imageCached =
distance < 6
? cache.getImageLoadObject(imageId)
: cache.isLoaded(imageId);
if (imageCached) {
// Already in cache
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);
}
// 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);
const { useNorm16Texture, preferSizeOverAccuracy } =
getCoreConfiguration().rendering;
const useNativeDataType = useNorm16Texture || preferSizeOverAccuracy;
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: useNativeDataType ? undefined : 'Float32Array',
},
preScale: {
enabled: true,
},
useNativeDataType,
requestType,
};
imageLoadPoolManager.addRequest(
requestFn.bind(null, imageId, options),
requestType,
// Additional details
{
imageId,
},
priority
// addToBeginning
);
});
}
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.indicesToRequest.length) {
stackPrefetchData.enabled = false;
// Clear current prefetch requests from the requestPool
imageLoadPoolManager.clearRequestStack(requestType);
}
}
function getConfiguration() {
return configuration;
}
function setConfiguration(config) {
configuration = config;
}
const stackPrefetch = { enable, disable, getConfiguration, setConfiguration };
export default stackPrefetch;
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