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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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {
Enums,
imageLoader,
imageLoadPoolManager,
utilities as csUtils,
} from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import StreamingImageVolume from './StreamingImageVolume';
interface IVolumeLoader {
promise: Promise<StreamingImageVolume>;
cancel: () => void;
decache: () => void;
}
/**
* It handles loading of a image by streaming in its imageIds. It will be the
* volume loader if the schema for the volumeID is `cornerstoneStreamingImageVolume`.
* This function returns a promise that resolves to the StreamingImageVolume instance.
*
* In order to use the cornerstoneStreamingImageVolumeLoader you should use
* createAndCacheVolume helper from the cornerstone-core volumeLoader module.
*
* @param volumeId - The ID of the volume
* @param options - options for loading, imageIds
* @returns a promise that resolves to a StreamingImageVolume
*/
function cornerstoneStreamingImageVolumeLoader(
volumeId: string,
options: {
imageIds: string[];
progressiveRendering?: boolean | Types.IRetrieveConfiguration;
}
): IVolumeLoader {
Iif (!options || !options.imageIds || !options.imageIds.length) {
throw new Error(
'ImageIds must be provided to create a streaming image volume'
);
}
async function getStreamingImageVolume() {
/**
* Check if we are using the `wadouri:` scheme, and if so, preload first,
* middle, and last image metadata as these are the images the current
* streaming image loader may explicitly request metadata from. The last image
* metadata would only be specifically requested if the imageId array order is
* reversed in the `sortImageIdsAndGetSpacing.ts` file.
*/
Iif (options.imageIds[0].split(':')[0] === 'wadouri') {
const [middleImageIndex, lastImageIndex] = [
Math.floor(options.imageIds.length / 2),
options.imageIds.length - 1,
];
const indexesToPrefetch = [0, middleImageIndex, lastImageIndex];
await Promise.all(
indexesToPrefetch.map((index) => {
return new Promise((resolve, reject) => {
const imageId = options.imageIds[index];
imageLoadPoolManager.addRequest(
async () => {
imageLoader
.loadImage(imageId)
.then(() => {
console.log(`Prefetched imageId: ${imageId}`);
resolve(true);
})
.catch((err) => {
reject(err);
});
},
Enums.RequestType.Prefetch,
{ volumeId },
1 // priority
);
});
})
).catch(console.error);
}
const {
dimensions,
spacing,
origin,
scalarData,
direction,
sizeInBytes,
metadata,
imageIds,
} = csUtils.generateVolumePropsFromImageIds(options.imageIds, volumeId);
const streamingImageVolume = new StreamingImageVolume(
// ImageVolume properties
{
volumeId,
metadata,
dimensions,
spacing,
origin,
direction,
scalarData,
sizeInBytes,
imageIds,
},
// Streaming properties
{
imageIds,
loadStatus: {
// todo: loading and loaded should be on ImageVolume
loaded: false,
loading: false,
cancelled: false,
cachedFrames: [],
callbacks: [],
},
}
);
return streamingImageVolume;
}
const streamingImageVolumePromise = getStreamingImageVolume();
return {
promise: streamingImageVolumePromise,
decache: () => {
streamingImageVolumePromise.then((streamingImageVolume) => {
streamingImageVolume.destroy();
streamingImageVolume = null;
});
},
cancel: () => {
streamingImageVolumePromise.then((streamingImageVolume) => {
streamingImageVolume.cancelLoading();
});
},
};
}
export default cornerstoneStreamingImageVolumeLoader;
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