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getVerticalBarImage,
getVerticalBarRGBImage,
} from './testUtilsPixelData';
/**
* It creates an image based on the imageId name for testing purposes. It splits the imageId
* based on "_" and deciphers each field of scheme, rows, columns, barStart, barWidth, x_spacing, y_spacing, rgb, and PT.
* fakeLoader: myImage_64_64_10_20_1_1_0 will load a grayscale test image of size 64 by
* 64 and with a vertical bar which starts at 10th pixel and span 20 pixels
* width, with pixel spacing of 1 mm and 1 mm in x and y direction.
*
* fakeImageLoader should be registered for each test image:
*
* @example
* ```javascript
* imageLoader.registerImageLoader('fakeImageLoader', imageLoader)
* ```
*
* then you can use imageId like: 'fakeImageLoader: myImage_64_64_10_20_1_1_0'
*
* @param {imageId} imageId
* @returns Promise that resolves to the image
*/
const fakeImageLoader = (imageId) => {
const imageURI = imageId.split(':')[1];
const [_, rows, columns, barStart, barWidth, x_spacing, y_spacing, rgb, PT] =
imageURI.split('_').map((v) => parseFloat(v));
let pixelData;
if (rgb) {
pixelData = getVerticalBarRGBImage(rows, columns, barStart, barWidth);
} else {
pixelData = getVerticalBarImage(rows, columns, barStart, barWidth);
}
// Todo: separated fakeImageLoader for cpu and gpu
const image = {
rows,
columns,
width: columns,
height: rows,
imageId,
intercept: 0,
slope: 1,
invert: false,
windowCenter: 40,
windowWidth: 400,
maxPixelValue: 255,
minPixelValue: 0,
rowPixelSpacing: y_spacing,
columnPixelSpacing: x_spacing,
getPixelData: () => pixelData,
sizeInBytes: rows * columns * 1, // 1 byte for now
FrameOfReferenceUID: 'Stack_Frame_Of_Reference',
imageFrame: {
photometricInterpretation: rgb ? 'RGB' : 'MONOCHROME2',
},
};
return {
promise: Promise.resolve(image),
};
};
/**
* Returns the requested metadata for the imageId
*
* Note: fakeMetadataLoader should be added as a provider for each test
*
* ```javascript
* metaData.addProvider(fakeMetaDataProvider, 10000)
* ```
*
*
*
* @param {string} type - metadata type
* @param {string} imageId - the imageId
* @returns metadata based on the imageId and type
*/
function fakeMetaDataProvider(type, imageId) {
// don't try to provide incorrect information for derived
// images, as it will cause errors, rather let the rest of providers
// handle it
Iif (imageId.startsWith('derived')) {
return;
}
Iif (Array.isArray(imageId)) {
return;
}
Iif (typeof imageId !== 'string') {
throw new Error(
`Expected imageId to be of type string, but received ${imageId}`
);
}
const imageURI = imageId.split(':')[1];
const [_, rows, columns, barStart, barWidth, x_spacing, y_spacing, rgb, PT] =
imageURI.split('_').map((v) => parseFloat(v));
const modality = PT ? 'PT' : 'MR';
const photometricInterpretation = rgb ? 'RGB' : 'MONOCHROME2';
if (type === 'imagePixelModule') {
const imagePixelModule = {
photometricInterpretation,
rows,
columns,
samplesPerPixel: rgb ? 3 : 1,
bitsAllocated: rgb ? 24 : 8,
bitsStored: rgb ? 24 : 8,
highBit: rgb ? 24 : 8,
pixelRepresentation: 0,
};
return imagePixelModule;
} else if (type === 'generalSeriesModule') {
const generalSeriesModule = {
modality: modality,
};
return generalSeriesModule;
} else if (type === 'scalingModule') {
const scalingModule = {
suvbw: 100,
suvlbm: 100,
suvbsa: 100,
};
return scalingModule;
} else if (type === 'imagePlaneModule') {
const imagePlaneModule = {
rows,
columns,
width: rows,
height: columns,
imageOrientationPatient: [1, 0, 0, 0, 1, 0],
rowCosines: [1, 0, 0],
columnCosines: [0, 1, 0],
imagePositionPatient: [0, 0, 0],
pixelSpacing: [x_spacing, y_spacing],
rowPixelSpacing: y_spacing,
columnPixelSpacing: x_spacing,
};
return imagePlaneModule;
} else if (type === 'voiLutModule') {
return {
windowWidth: undefined,
windowCenter: undefined,
};
} else if (type === 'modalityLutModule') {
return {
rescaleSlope: undefined,
rescaleIntercept: undefined,
};
}
}
export { fakeImageLoader, fakeMetaDataProvider };
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