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import vtkImageData from '@kitware/vtk.js/Common/DataModel/ImageData';
import type { vtkImageData as vtkImageDataType } from '@kitware/vtk.js/Common/DataModel/ImageData';
import vtkDataArray from '@kitware/vtk.js/Common/Core/DataArray';
import cloneDeep from 'lodash.clonedeep';
import { ImageVolume } from '../cache/classes/ImageVolume';
import type * as Types from '../types';
import cache from '../cache/cache';
import Events from '../enums/Events';
import eventTarget from '../eventTarget';
import triggerEvent from '../utilities/triggerEvent';
import { uuidv4 } from '../utilities';
import { Point3, Metadata, EventTypes, Mat3 } from '../types';
interface VolumeLoaderOptions {
imageIds: Array<string>;
}
interface DerivedVolumeOptions {
volumeId: string;
targetBuffer?: {
type: 'Float32Array' | 'Uint8Array';
sharedArrayBuffer?: boolean;
};
}
interface LocalVolumeOptions {
scalarData: Float32Array | Uint8Array;
metadata: Metadata;
dimensions: Point3;
spacing: Point3;
origin: Point3;
direction: Mat3;
}
function createInternalVTKRepresentation({
dimensions,
metadata,
spacing,
direction,
origin,
scalarData,
}): vtkImageDataType {
const { PhotometricInterpretation } = metadata;
let numComponents = 1;
if (PhotometricInterpretation === 'RGB') {
numComponents = 3;
}
const scalarArray = vtkDataArray.newInstance({
name: 'Pixels',
numberOfComponents: numComponents,
values: scalarData,
});
const imageData = vtkImageData.newInstance();
imageData.setDimensions(dimensions);
imageData.setSpacing(spacing);
imageData.setDirection(direction);
imageData.setOrigin(origin);
imageData.getPointData().setScalars(scalarArray);
return imageData;
}
/**
* This module deals with VolumeLoaders and loading volumes
*/
const volumeLoaders = {};
let unknownVolumeLoader;
/**
* Load a volume using a registered Cornerstone Volume Loader.
*
* The volume loader that is used will be
* determined by the volume loader scheme matching against the volumeId.
*
* @param volumeId - A Cornerstone Volume Object's volumeId
* @param options - Options to be passed to the Volume Loader. Options
* contain the ImageIds that is passed to the loader
*
* @returns An Object which can be used to act after a volume is loaded or loading fails
*
*/
function loadVolumeFromVolumeLoader(
volumeId: string,
options: VolumeLoaderOptions
): Types.IVolumeLoadObject {
const colonIndex = volumeId.indexOf(':');
const scheme = volumeId.substring(0, colonIndex);
const loader = volumeLoaders[scheme];
Iif (loader === undefined || loader === null) {
if (unknownVolumeLoader !== undefined) {
return unknownVolumeLoader(volumeId, options);
}
throw new Error(
'loadVolumeFromVolumeLoader: no volume loader for volumeId'
);
}
const volumeLoadObject = loader(volumeId, options);
// Broadcast a volume loaded event once the image is loaded
volumeLoadObject.promise.then(
function (volume) {
triggerEvent(eventTarget, Events.VOLUME_LOADED, { volume });
},
function (error) {
const errorObject: EventTypes.VolumeLoadedFailedEventDetail = {
volumeId,
error,
};
triggerEvent(eventTarget, Events.VOLUME_LOADED_FAILED, errorObject);
}
);
return volumeLoadObject;
}
/**
* Loads a volume given a volumeId and optional priority and returns a promise which will resolve to
* the loaded image object or fail if an error occurred. The loaded image is not stored in the cache.
*
* @param volumeId - A Cornerstone Image Object's volumeId
* @param options - Options to be passed to the Volume Loader
*
* @returns An Object which can be used to act after an image is loaded or loading fails
*/
export function loadVolume(
volumeId: string,
options: VolumeLoaderOptions = { imageIds: [] }
): Promise<Types.IImageVolume> {
Iif (volumeId === undefined) {
throw new Error('loadVolume: parameter volumeId must not be undefined');
}
let volumeLoadObject = cache.getVolumeLoadObject(volumeId);
Eif (volumeLoadObject !== undefined) {
return volumeLoadObject.promise;
}
volumeLoadObject = loadVolumeFromVolumeLoader(volumeId, options);
return volumeLoadObject.promise.then((volume: Types.IImageVolume) => {
volume.imageData = createInternalVTKRepresentation(volume);
return volume;
});
}
/**
* Loads an image given an volumeId and optional priority and returns a promise which will resolve to
* the loaded image object or fail if an error occurred. The image is stored in the cache.
*
* @param volumeId - A Cornerstone Image Object's volumeId
* @param options - Options to be passed to the Volume Loader
*
* @returns Volume Loader Object
*/
export async function createAndCacheVolume(
volumeId: string,
options: VolumeLoaderOptions
): Promise<Record<string, any>> {
if (volumeId === undefined) {
throw new Error(
'createAndCacheVolume: parameter volumeId must not be undefined'
);
}
let volumeLoadObject = cache.getVolumeLoadObject(volumeId);
if (volumeLoadObject !== undefined) {
return volumeLoadObject.promise;
}
volumeLoadObject = loadVolumeFromVolumeLoader(volumeId, options);
volumeLoadObject.promise.then((volume: Types.IImageVolume) => {
volume.imageData = createInternalVTKRepresentation(volume);
});
cache.putVolumeLoadObject(volumeId, volumeLoadObject).catch((err) => {
throw err;
});
return volumeLoadObject.promise;
}
/**
* Based on a referencedVolumeId, it will build and cache a new volume. If
* no scalarData is specified in the options, an empty derived volume will be
* created that matches the image metadata of the referenceVolume. If scalarData
* is given, it will be used to generate the intensity values for the derivedVolume.
* Finally, it will save the volume in the cache.
* @param referencedVolumeId - the volumeId from which the new volume will get its metadata
* @param options - DerivedVolumeOptions {uid: derivedVolumeUID, targetBuffer: { type: FLOAT32Array | Uint8Array}, scalarData: if provided}
*
* @returns ImageVolume
*/
export Easync function createAndCacheDerivedVolume(
referencedVolumeId: string,
options: DerivedVolumeOptions
): Promise<ImageVolume> {
const referencedVolume = cache.getVolume(referencedVolumeId);
if (!referencedVolume) {
throw new Error(
`Cannot created derived volume: Referenced volume with id ${referencedVolumeId} does not exist.`
);
}
let { volumeId } = options;
const { targetBuffer } = options;
Iif (volumeId === undefined) {
volumeId = uuidv4();
}
const { metadata, dimensions, spacing, origin, direction, scalarData } =
referencedVolume;
const scalarLength = scalarData.length;
let numBytes, TypedArray;
// If target buffer is provided
if (targetBuffer) {
if (targetBuffer.type === 'Float32Array') {
numBytes = scalarLength * 4;
TypedArray = Float32Array;
} else if (targetBuffer.type === 'Uint8Array') {
numBytes = scalarLength;
TypedArray = Uint8Array;
} else {
throw new Error('TargetBuffer should be Float32Array or Uint8Array');
}
} else {
// Use float32 if no targetBuffer is provided
numBytes = scalarLength * 4;
TypedArray = Float32Array;
}
// check if there is enough space in unallocated + image Cache
const isCacheable = cache.isCacheable(numBytes);
if (!isCacheable) {
throw new Error(Events.CACHE_SIZE_EXCEEDED);
}
let volumeScalarData;
Iif (targetBuffer?.sharedArrayBuffer) {
const buffer = new SharedArrayBuffer(numBytes);
volumeScalarData = new TypedArray(buffer);
} else {
volumeScalarData = new TypedArray(scalarLength);
}
// Todo: handle more than one component for segmentation (RGB)
const scalarArray = vtkDataArray.newInstance({
name: 'Pixels',
numberOfComponents: 1,
values: volumeScalarData,
});
const derivedImageData = vtkImageData.newInstance();
derivedImageData.setDimensions(dimensions);
derivedImageData.setSpacing(spacing);
derivedImageData.setDirection(direction);
derivedImageData.setOrigin(origin);
derivedImageData.getPointData().setScalars(scalarArray);
const derivedVolume = new ImageVolume({
volumeId,
metadata: cloneDeep(metadata),
dimensions: [dimensions[0], dimensions[1], dimensions[2]],
spacing,
origin,
direction,
imageData: derivedImageData,
scalarData: volumeScalarData,
sizeInBytes: numBytes,
referencedVolumeId,
});
const volumeLoadObject = {
promise: Promise.resolve(derivedVolume),
};
await cache.putVolumeLoadObject(volumeId, volumeLoadObject);
return derivedVolume;
}
/**
* Creates and cache a volume based on a set of provided properties including
* dimensions, spacing, origin, direction, metadata, scalarData. It should be noted that
* scalarData should be provided for this function to work. If a volume with the same
* Id exists in the cache it returns it immediately.
* @param options - { scalarData, metadata, dimensions, spacing, origin, direction }
* @param volumeId - Id of the generated volume
*
* @returns ImageVolume
*/
export function createLocalVolume(
options: LocalVolumeOptions,
volumeId: string,
preventCache = false
): ImageVolume {
const { scalarData, metadata, dimensions, spacing, origin, direction } =
options;
if (
!scalarData ||
!(scalarData instanceof Uint8Array || scalarData instanceof Float32Array)
) {
throw new Error(
'To use createLocalVolume you should pass scalarData of type Uint8Array or Float32Array'
);
}
// Todo: handle default values for spacing, origin, direction if not provided
if (volumeId === undefined) {
volumeId = uuidv4();
}
const cachedVolume = cache.getVolume(volumeId);
if (cachedVolume) {
return cachedVolume as ImageVolume;
}
const scalarLength = dimensions[0] * dimensions[1] * dimensions[2];
const numBytes = scalarData ? scalarData.buffer.byteLength : scalarLength * 4;
// check if there is enough space in unallocated + image Cache
const isCacheable = cache.isCacheable(numBytes);
if (!isCacheable) {
throw new Error(Events.CACHE_SIZE_EXCEEDED);
}
const scalarArray = vtkDataArray.newInstance({
name: 'Pixels',
numberOfComponents: 1,
values: scalarData,
});
const imageData = vtkImageData.newInstance();
imageData.setDimensions(dimensions);
imageData.setSpacing(spacing);
imageData.setDirection(direction);
imageData.setOrigin(origin);
imageData.getPointData().setScalars(scalarArray);
const derivedVolume = new ImageVolume({
volumeId,
metadata: cloneDeep(metadata),
dimensions: [dimensions[0], dimensions[1], dimensions[2]],
spacing,
origin,
direction,
imageData: imageData,
scalarData,
sizeInBytes: numBytes,
});
if (preventCache) {
return derivedVolume;
}
const volumeLoadObject = {
promise: Promise.resolve(derivedVolume),
};
cache.putVolumeLoadObject(volumeId, volumeLoadObject);
return derivedVolume;
}
/**
* Registers an volumeLoader plugin with cornerstone for the specified scheme
*
* @param scheme - The scheme to use for this volume loader (e.g. 'dicomweb', 'wadouri', 'http')
* @param volumeLoader - A Cornerstone Volume Loader function
*/
export function registerVolumeLoader(
scheme: string,
volumeLoader: Types.VolumeLoaderFn
): void {
volumeLoaders[scheme] = volumeLoader;
}
/**
* Registers a new unknownVolumeLoader and returns the previous one
*
* @param volumeLoader - A Cornerstone Volume Loader
*
* @returns The previous Unknown Volume Loader
*/
export function registerUnknownVolumeLoader(
volumeLoader: Types.VolumeLoaderFn
): Types.VolumeLoaderFn | undefined {
const oldVolumeLoader = unknownVolumeLoader;
unknownVolumeLoader = volumeLoader;
return oldVolumeLoader;
}
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